63cde6278d
1.3 suppress warnings on K&R main.
6998 lines
220 KiB
C
6998 lines
220 KiB
C
/* Process declarations and variables for C compiler.
|
||
Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
|
||
2001, 2002 Free Software Foundation, Inc.
|
||
|
||
This file is part of GCC.
|
||
|
||
GCC is free software; you can redistribute it and/or modify it under
|
||
the terms of the GNU General Public License as published by the Free
|
||
Software Foundation; either version 2, or (at your option) any later
|
||
version.
|
||
|
||
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
||
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||
for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with GCC; see the file COPYING. If not, write to the Free
|
||
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
|
||
02111-1307, USA. */
|
||
|
||
/* $FreeBSD$ */
|
||
|
||
/* Process declarations and symbol lookup for C front end.
|
||
Also constructs types; the standard scalar types at initialization,
|
||
and structure, union, array and enum types when they are declared. */
|
||
|
||
/* ??? not all decl nodes are given the most useful possible
|
||
line numbers. For example, the CONST_DECLs for enum values. */
|
||
|
||
#include "config.h"
|
||
#include "system.h"
|
||
#include "intl.h"
|
||
#include "tree.h"
|
||
#include "tree-inline.h"
|
||
#include "rtl.h"
|
||
#include "flags.h"
|
||
#include "function.h"
|
||
#include "output.h"
|
||
#include "expr.h"
|
||
#include "c-tree.h"
|
||
#include "toplev.h"
|
||
#include "ggc.h"
|
||
#include "tm_p.h"
|
||
#include "cpplib.h"
|
||
#include "target.h"
|
||
#include "debug.h"
|
||
#include "timevar.h"
|
||
#include "c-common.h"
|
||
#include "c-pragma.h"
|
||
#include "libfuncs.h"
|
||
#include "except.h"
|
||
|
||
/* In grokdeclarator, distinguish syntactic contexts of declarators. */
|
||
enum decl_context
|
||
{ NORMAL, /* Ordinary declaration */
|
||
FUNCDEF, /* Function definition */
|
||
PARM, /* Declaration of parm before function body */
|
||
FIELD, /* Declaration inside struct or union */
|
||
BITFIELD, /* Likewise but with specified width */
|
||
TYPENAME}; /* Typename (inside cast or sizeof) */
|
||
|
||
|
||
/* Nonzero if we have seen an invalid cross reference
|
||
to a struct, union, or enum, but not yet printed the message. */
|
||
|
||
tree pending_invalid_xref;
|
||
/* File and line to appear in the eventual error message. */
|
||
const char *pending_invalid_xref_file;
|
||
int pending_invalid_xref_line;
|
||
|
||
/* While defining an enum type, this is 1 plus the last enumerator
|
||
constant value. Note that will do not have to save this or `enum_overflow'
|
||
around nested function definition since such a definition could only
|
||
occur in an enum value expression and we don't use these variables in
|
||
that case. */
|
||
|
||
static tree enum_next_value;
|
||
|
||
/* Nonzero means that there was overflow computing enum_next_value. */
|
||
|
||
static int enum_overflow;
|
||
|
||
/* Parsing a function declarator leaves a list of parameter names
|
||
or a chain or parameter decls here. */
|
||
|
||
static tree last_function_parms;
|
||
|
||
/* Parsing a function declarator leaves here a chain of structure
|
||
and enum types declared in the parmlist. */
|
||
|
||
static tree last_function_parm_tags;
|
||
|
||
/* After parsing the declarator that starts a function definition,
|
||
`start_function' puts here the list of parameter names or chain of decls.
|
||
`store_parm_decls' finds it here. */
|
||
|
||
static tree current_function_parms;
|
||
|
||
/* Similar, for last_function_parm_tags. */
|
||
static tree current_function_parm_tags;
|
||
|
||
/* Similar, for the file and line that the prototype came from if this is
|
||
an old-style definition. */
|
||
static const char *current_function_prototype_file;
|
||
static int current_function_prototype_line;
|
||
|
||
/* The current statement tree. */
|
||
|
||
static GTY(()) struct stmt_tree_s c_stmt_tree;
|
||
|
||
/* The current scope statement stack. */
|
||
|
||
static GTY(()) tree c_scope_stmt_stack;
|
||
|
||
/* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
|
||
that have names. Here so we can clear out their names' definitions
|
||
at the end of the function. */
|
||
|
||
static GTY(()) tree named_labels;
|
||
|
||
/* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
|
||
|
||
static GTY(()) tree shadowed_labels;
|
||
|
||
/* Set to 0 at beginning of a function definition, set to 1 if
|
||
a return statement that specifies a return value is seen. */
|
||
|
||
int current_function_returns_value;
|
||
|
||
/* Set to 0 at beginning of a function definition, set to 1 if
|
||
a return statement with no argument is seen. */
|
||
|
||
int current_function_returns_null;
|
||
|
||
/* Set to 0 at beginning of a function definition, set to 1 if
|
||
a call to a noreturn function is seen. */
|
||
|
||
int current_function_returns_abnormally;
|
||
|
||
/* Set to nonzero by `grokdeclarator' for a function
|
||
whose return type is defaulted, if warnings for this are desired. */
|
||
|
||
static int warn_about_return_type;
|
||
|
||
/* Nonzero when starting a function declared `extern inline'. */
|
||
|
||
static int current_extern_inline;
|
||
|
||
/* For each binding contour we allocate a binding_level structure
|
||
* which records the names defined in that contour.
|
||
* Contours include:
|
||
* 0) the global one
|
||
* 1) one for each function definition,
|
||
* where internal declarations of the parameters appear.
|
||
* 2) one for each compound statement,
|
||
* to record its declarations.
|
||
*
|
||
* The current meaning of a name can be found by searching the levels from
|
||
* the current one out to the global one.
|
||
*/
|
||
|
||
/* Note that the information in the `names' component of the global contour
|
||
is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
|
||
|
||
struct binding_level GTY(())
|
||
{
|
||
/* A chain of _DECL nodes for all variables, constants, functions,
|
||
and typedef types. These are in the reverse of the order supplied.
|
||
*/
|
||
tree names;
|
||
|
||
/* A list of structure, union and enum definitions,
|
||
* for looking up tag names.
|
||
* It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
|
||
* or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
|
||
* or ENUMERAL_TYPE node.
|
||
*/
|
||
tree tags;
|
||
|
||
/* For each level, a list of shadowed outer-level local definitions
|
||
to be restored when this level is popped.
|
||
Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
|
||
whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
|
||
tree shadowed;
|
||
|
||
/* For each level (except not the global one),
|
||
a chain of BLOCK nodes for all the levels
|
||
that were entered and exited one level down. */
|
||
tree blocks;
|
||
|
||
/* The BLOCK node for this level, if one has been preallocated.
|
||
If 0, the BLOCK is allocated (if needed) when the level is popped. */
|
||
tree this_block;
|
||
|
||
/* The binding level which this one is contained in (inherits from). */
|
||
struct binding_level *level_chain;
|
||
|
||
/* Nonzero for the level that holds the parameters of a function. */
|
||
char parm_flag;
|
||
|
||
/* Nonzero if this level "doesn't exist" for tags. */
|
||
char tag_transparent;
|
||
|
||
/* Nonzero if sublevels of this level "don't exist" for tags.
|
||
This is set in the parm level of a function definition
|
||
while reading the function body, so that the outermost block
|
||
of the function body will be tag-transparent. */
|
||
char subblocks_tag_transparent;
|
||
|
||
/* Nonzero means make a BLOCK for this level regardless of all else. */
|
||
char keep;
|
||
|
||
/* Nonzero means make a BLOCK if this level has any subblocks. */
|
||
char keep_if_subblocks;
|
||
|
||
/* List of decls in `names' that have incomplete structure or
|
||
union types. */
|
||
tree incomplete_list;
|
||
|
||
/* A list of decls giving the (reversed) specified order of parms,
|
||
not including any forward-decls in the parmlist.
|
||
This is so we can put the parms in proper order for assign_parms. */
|
||
tree parm_order;
|
||
};
|
||
|
||
#define NULL_BINDING_LEVEL (struct binding_level *) NULL
|
||
|
||
/* The binding level currently in effect. */
|
||
|
||
static GTY(()) struct binding_level *current_binding_level;
|
||
|
||
/* A chain of binding_level structures awaiting reuse. */
|
||
|
||
static GTY((deletable (""))) struct binding_level *free_binding_level;
|
||
|
||
/* The outermost binding level, for names of file scope.
|
||
This is created when the compiler is started and exists
|
||
through the entire run. */
|
||
|
||
static GTY(()) struct binding_level *global_binding_level;
|
||
|
||
/* Binding level structures are initialized by copying this one. */
|
||
|
||
static struct binding_level clear_binding_level
|
||
= {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, NULL,
|
||
NULL};
|
||
|
||
/* Nonzero means unconditionally make a BLOCK for the next level pushed. */
|
||
|
||
static int keep_next_level_flag;
|
||
|
||
/* Nonzero means make a BLOCK for the next level pushed
|
||
if it has subblocks. */
|
||
|
||
static int keep_next_if_subblocks;
|
||
|
||
/* The chain of outer levels of label scopes.
|
||
This uses the same data structure used for binding levels,
|
||
but it works differently: each link in the chain records
|
||
saved values of named_labels and shadowed_labels for
|
||
a label binding level outside the current one. */
|
||
|
||
static GTY(()) struct binding_level *label_level_chain;
|
||
|
||
/* Functions called automatically at the beginning and end of execution. */
|
||
|
||
tree static_ctors, static_dtors;
|
||
|
||
/* Forward declarations. */
|
||
|
||
static struct binding_level * make_binding_level PARAMS ((void));
|
||
static void pop_binding_level PARAMS ((struct binding_level **));
|
||
static void clear_limbo_values PARAMS ((tree));
|
||
static int duplicate_decls PARAMS ((tree, tree, int));
|
||
static int redeclaration_error_message PARAMS ((tree, tree));
|
||
static void storedecls PARAMS ((tree));
|
||
static void storetags PARAMS ((tree));
|
||
static tree lookup_tag PARAMS ((enum tree_code, tree,
|
||
struct binding_level *, int));
|
||
static tree lookup_tag_reverse PARAMS ((tree));
|
||
static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
|
||
int));
|
||
static tree grokparms PARAMS ((tree, int));
|
||
static void layout_array_type PARAMS ((tree));
|
||
static tree c_make_fname_decl PARAMS ((tree, int));
|
||
static void c_expand_body PARAMS ((tree, int, int));
|
||
static void warn_if_shadowing PARAMS ((tree, tree));
|
||
static bool flexible_array_type_p PARAMS ((tree));
|
||
static tree set_save_expr_context PARAMS ((tree *, int *, void *));
|
||
|
||
/* States indicating how grokdeclarator() should handle declspecs marked
|
||
with __attribute__((deprecated)). An object declared as
|
||
__attribute__((deprecated)) suppresses warnings of uses of other
|
||
deprecated items. */
|
||
|
||
enum deprecated_states {
|
||
DEPRECATED_NORMAL,
|
||
DEPRECATED_SUPPRESS
|
||
};
|
||
|
||
static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
|
||
|
||
void
|
||
c_print_identifier (file, node, indent)
|
||
FILE *file;
|
||
tree node;
|
||
int indent;
|
||
{
|
||
print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
|
||
print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
|
||
print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
|
||
print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
|
||
print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
|
||
print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
|
||
if (C_IS_RESERVED_WORD (node))
|
||
{
|
||
tree rid = ridpointers[C_RID_CODE (node)];
|
||
indent_to (file, indent + 4);
|
||
fprintf (file, "rid ");
|
||
fprintf (file, HOST_PTR_PRINTF, (void *)rid);
|
||
fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
|
||
}
|
||
}
|
||
|
||
/* Hook called at end of compilation to assume 1 elt
|
||
for a top-level tentative array defn that wasn't complete before. */
|
||
|
||
void
|
||
c_finish_incomplete_decl (decl)
|
||
tree decl;
|
||
{
|
||
if (TREE_CODE (decl) == VAR_DECL)
|
||
{
|
||
tree type = TREE_TYPE (decl);
|
||
if (type != error_mark_node
|
||
&& TREE_CODE (type) == ARRAY_TYPE
|
||
&& ! DECL_EXTERNAL (decl)
|
||
&& TYPE_DOMAIN (type) == 0)
|
||
{
|
||
warning_with_decl (decl, "array `%s' assumed to have one element");
|
||
|
||
complete_array_type (type, NULL_TREE, 1);
|
||
|
||
layout_decl (decl, 0);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Reuse or create a struct for this binding level. */
|
||
|
||
static struct binding_level *
|
||
make_binding_level ()
|
||
{
|
||
if (free_binding_level)
|
||
{
|
||
struct binding_level *result = free_binding_level;
|
||
free_binding_level = result->level_chain;
|
||
return result;
|
||
}
|
||
else
|
||
return (struct binding_level *) ggc_alloc (sizeof (struct binding_level));
|
||
}
|
||
|
||
/* Remove a binding level from a list and add it to the level chain. */
|
||
|
||
static void
|
||
pop_binding_level (lp)
|
||
struct binding_level **lp;
|
||
{
|
||
struct binding_level *l = *lp;
|
||
*lp = l->level_chain;
|
||
|
||
memset (l, 0, sizeof (struct binding_level));
|
||
l->level_chain = free_binding_level;
|
||
free_binding_level = l;
|
||
}
|
||
|
||
/* Nonzero if we are currently in the global binding level. */
|
||
|
||
int
|
||
global_bindings_p ()
|
||
{
|
||
return current_binding_level == global_binding_level;
|
||
}
|
||
|
||
void
|
||
keep_next_level ()
|
||
{
|
||
keep_next_level_flag = 1;
|
||
}
|
||
|
||
/* Nonzero if the current level needs to have a BLOCK made. */
|
||
|
||
int
|
||
kept_level_p ()
|
||
{
|
||
return ((current_binding_level->keep_if_subblocks
|
||
&& current_binding_level->blocks != 0)
|
||
|| current_binding_level->keep
|
||
|| current_binding_level->names != 0
|
||
|| (current_binding_level->tags != 0
|
||
&& !current_binding_level->tag_transparent));
|
||
}
|
||
|
||
/* Identify this binding level as a level of parameters.
|
||
DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
|
||
But it turns out there is no way to pass the right value for
|
||
DEFINITION_FLAG, so we ignore it. */
|
||
|
||
void
|
||
declare_parm_level (definition_flag)
|
||
int definition_flag ATTRIBUTE_UNUSED;
|
||
{
|
||
current_binding_level->parm_flag = 1;
|
||
}
|
||
|
||
/* Nonzero if currently making parm declarations. */
|
||
|
||
int
|
||
in_parm_level_p ()
|
||
{
|
||
return current_binding_level->parm_flag;
|
||
}
|
||
|
||
/* Enter a new binding level.
|
||
If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
|
||
not for that of tags. */
|
||
|
||
void
|
||
pushlevel (tag_transparent)
|
||
int tag_transparent;
|
||
{
|
||
struct binding_level *newlevel = NULL_BINDING_LEVEL;
|
||
|
||
/* If this is the top level of a function,
|
||
just make sure that NAMED_LABELS is 0. */
|
||
|
||
if (current_binding_level == global_binding_level)
|
||
{
|
||
named_labels = 0;
|
||
}
|
||
|
||
newlevel = make_binding_level ();
|
||
|
||
/* Add this level to the front of the chain (stack) of levels that
|
||
are active. */
|
||
|
||
*newlevel = clear_binding_level;
|
||
newlevel->tag_transparent
|
||
= (tag_transparent
|
||
|| (current_binding_level
|
||
? current_binding_level->subblocks_tag_transparent
|
||
: 0));
|
||
newlevel->level_chain = current_binding_level;
|
||
current_binding_level = newlevel;
|
||
newlevel->keep = keep_next_level_flag;
|
||
keep_next_level_flag = 0;
|
||
newlevel->keep_if_subblocks = keep_next_if_subblocks;
|
||
keep_next_if_subblocks = 0;
|
||
}
|
||
|
||
/* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
|
||
|
||
static void
|
||
clear_limbo_values (block)
|
||
tree block;
|
||
{
|
||
tree tem;
|
||
|
||
for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
|
||
if (DECL_NAME (tem) != 0)
|
||
IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
|
||
|
||
for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
|
||
clear_limbo_values (tem);
|
||
}
|
||
|
||
/* Exit a binding level.
|
||
Pop the level off, and restore the state of the identifier-decl mappings
|
||
that were in effect when this level was entered.
|
||
|
||
If KEEP is nonzero, this level had explicit declarations, so
|
||
and create a "block" (a BLOCK node) for the level
|
||
to record its declarations and subblocks for symbol table output.
|
||
|
||
If FUNCTIONBODY is nonzero, this level is the body of a function,
|
||
so create a block as if KEEP were set and also clear out all
|
||
label names.
|
||
|
||
If REVERSE is nonzero, reverse the order of decls before putting
|
||
them into the BLOCK. */
|
||
|
||
tree
|
||
poplevel (keep, reverse, functionbody)
|
||
int keep;
|
||
int reverse;
|
||
int functionbody;
|
||
{
|
||
tree link;
|
||
/* The chain of decls was accumulated in reverse order.
|
||
Put it into forward order, just for cleanliness. */
|
||
tree decls;
|
||
tree tags = current_binding_level->tags;
|
||
tree subblocks = current_binding_level->blocks;
|
||
tree block = 0;
|
||
tree decl;
|
||
int block_previously_created;
|
||
|
||
keep |= current_binding_level->keep;
|
||
|
||
/* This warning is turned off because it causes warnings for
|
||
declarations like `extern struct foo *x'. */
|
||
#if 0
|
||
/* Warn about incomplete structure types in this level. */
|
||
for (link = tags; link; link = TREE_CHAIN (link))
|
||
if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
|
||
{
|
||
tree type = TREE_VALUE (link);
|
||
tree type_name = TYPE_NAME (type);
|
||
char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
|
||
? type_name
|
||
: DECL_NAME (type_name));
|
||
switch (TREE_CODE (type))
|
||
{
|
||
case RECORD_TYPE:
|
||
error ("`struct %s' incomplete in scope ending here", id);
|
||
break;
|
||
case UNION_TYPE:
|
||
error ("`union %s' incomplete in scope ending here", id);
|
||
break;
|
||
case ENUMERAL_TYPE:
|
||
error ("`enum %s' incomplete in scope ending here", id);
|
||
break;
|
||
}
|
||
}
|
||
#endif /* 0 */
|
||
|
||
/* Get the decls in the order they were written.
|
||
Usually current_binding_level->names is in reverse order.
|
||
But parameter decls were previously put in forward order. */
|
||
|
||
if (reverse)
|
||
current_binding_level->names
|
||
= decls = nreverse (current_binding_level->names);
|
||
else
|
||
decls = current_binding_level->names;
|
||
|
||
/* Output any nested inline functions within this block
|
||
if they weren't already output. */
|
||
|
||
for (decl = decls; decl; decl = TREE_CHAIN (decl))
|
||
if (TREE_CODE (decl) == FUNCTION_DECL
|
||
&& ! TREE_ASM_WRITTEN (decl)
|
||
&& DECL_INITIAL (decl) != 0
|
||
&& TREE_ADDRESSABLE (decl))
|
||
{
|
||
/* If this decl was copied from a file-scope decl
|
||
on account of a block-scope extern decl,
|
||
propagate TREE_ADDRESSABLE to the file-scope decl.
|
||
|
||
DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
|
||
true, since then the decl goes through save_for_inline_copying. */
|
||
if (DECL_ABSTRACT_ORIGIN (decl) != 0
|
||
&& DECL_ABSTRACT_ORIGIN (decl) != decl)
|
||
TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
|
||
}
|
||
|
||
/* We used to warn about unused variables in expand_end_bindings,
|
||
i.e. while generating RTL. But in function-at-a-time mode we may
|
||
choose to never expand a function at all (e.g. auto inlining), so
|
||
we do this explicitly now. */
|
||
warn_about_unused_variables (getdecls ());
|
||
|
||
/* If there were any declarations or structure tags in that level,
|
||
or if this level is a function body,
|
||
create a BLOCK to record them for the life of this function. */
|
||
|
||
block = 0;
|
||
block_previously_created = (current_binding_level->this_block != 0);
|
||
if (block_previously_created)
|
||
block = current_binding_level->this_block;
|
||
else if (keep || functionbody
|
||
|| (current_binding_level->keep_if_subblocks && subblocks != 0))
|
||
block = make_node (BLOCK);
|
||
if (block != 0)
|
||
{
|
||
BLOCK_VARS (block) = decls;
|
||
BLOCK_SUBBLOCKS (block) = subblocks;
|
||
}
|
||
|
||
/* In each subblock, record that this is its superior. */
|
||
|
||
for (link = subblocks; link; link = TREE_CHAIN (link))
|
||
BLOCK_SUPERCONTEXT (link) = block;
|
||
|
||
/* Clear out the meanings of the local variables of this level. */
|
||
|
||
for (link = decls; link; link = TREE_CHAIN (link))
|
||
{
|
||
if (DECL_NAME (link) != 0)
|
||
{
|
||
/* If the ident. was used or addressed via a local extern decl,
|
||
don't forget that fact. */
|
||
if (DECL_EXTERNAL (link))
|
||
{
|
||
if (TREE_USED (link))
|
||
TREE_USED (DECL_NAME (link)) = 1;
|
||
if (TREE_ADDRESSABLE (link))
|
||
TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
|
||
}
|
||
IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
|
||
}
|
||
}
|
||
|
||
/* Restore all name-meanings of the outer levels
|
||
that were shadowed by this level. */
|
||
|
||
for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
|
||
IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
|
||
|
||
/* If the level being exited is the top level of a function,
|
||
check over all the labels, and clear out the current
|
||
(function local) meanings of their names. */
|
||
|
||
if (functionbody)
|
||
{
|
||
clear_limbo_values (block);
|
||
|
||
/* If this is the top level block of a function,
|
||
the vars are the function's parameters.
|
||
Don't leave them in the BLOCK because they are
|
||
found in the FUNCTION_DECL instead. */
|
||
|
||
BLOCK_VARS (block) = 0;
|
||
|
||
/* Clear out the definitions of all label names,
|
||
since their scopes end here,
|
||
and add them to BLOCK_VARS. */
|
||
|
||
for (link = named_labels; link; link = TREE_CHAIN (link))
|
||
{
|
||
tree label = TREE_VALUE (link);
|
||
|
||
if (DECL_INITIAL (label) == 0)
|
||
{
|
||
error_with_decl (label, "label `%s' used but not defined");
|
||
/* Avoid crashing later. */
|
||
define_label (input_filename, lineno,
|
||
DECL_NAME (label));
|
||
}
|
||
else if (warn_unused_label && !TREE_USED (label))
|
||
warning_with_decl (label, "label `%s' defined but not used");
|
||
IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
|
||
|
||
/* Put the labels into the "variables" of the
|
||
top-level block, so debugger can see them. */
|
||
TREE_CHAIN (label) = BLOCK_VARS (block);
|
||
BLOCK_VARS (block) = label;
|
||
}
|
||
}
|
||
|
||
/* Pop the current level, and free the structure for reuse. */
|
||
|
||
pop_binding_level (¤t_binding_level);
|
||
|
||
/* Dispose of the block that we just made inside some higher level. */
|
||
if (functionbody)
|
||
DECL_INITIAL (current_function_decl) = block;
|
||
else if (block)
|
||
{
|
||
if (!block_previously_created)
|
||
current_binding_level->blocks
|
||
= chainon (current_binding_level->blocks, block);
|
||
}
|
||
/* If we did not make a block for the level just exited,
|
||
any blocks made for inner levels
|
||
(since they cannot be recorded as subblocks in that level)
|
||
must be carried forward so they will later become subblocks
|
||
of something else. */
|
||
else if (subblocks)
|
||
current_binding_level->blocks
|
||
= chainon (current_binding_level->blocks, subblocks);
|
||
|
||
/* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
|
||
binding contour so that they point to the appropriate construct, i.e.
|
||
either to the current FUNCTION_DECL node, or else to the BLOCK node
|
||
we just constructed.
|
||
|
||
Note that for tagged types whose scope is just the formal parameter
|
||
list for some function type specification, we can't properly set
|
||
their TYPE_CONTEXTs here, because we don't have a pointer to the
|
||
appropriate FUNCTION_TYPE node readily available to us. For those
|
||
cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
|
||
in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
|
||
node which will represent the "scope" for these "parameter list local"
|
||
tagged types. */
|
||
|
||
if (functionbody)
|
||
for (link = tags; link; link = TREE_CHAIN (link))
|
||
TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
|
||
else if (block)
|
||
for (link = tags; link; link = TREE_CHAIN (link))
|
||
TYPE_CONTEXT (TREE_VALUE (link)) = block;
|
||
|
||
if (block)
|
||
TREE_USED (block) = 1;
|
||
|
||
return block;
|
||
}
|
||
|
||
/* Insert BLOCK at the end of the list of subblocks of the
|
||
current binding level. This is used when a BIND_EXPR is expanded,
|
||
to handle the BLOCK node inside the BIND_EXPR. */
|
||
|
||
void
|
||
insert_block (block)
|
||
tree block;
|
||
{
|
||
TREE_USED (block) = 1;
|
||
current_binding_level->blocks
|
||
= chainon (current_binding_level->blocks, block);
|
||
}
|
||
|
||
/* Set the BLOCK node for the innermost scope
|
||
(the one we are currently in). */
|
||
|
||
void
|
||
set_block (block)
|
||
tree block;
|
||
{
|
||
current_binding_level->this_block = block;
|
||
current_binding_level->names = chainon (current_binding_level->names,
|
||
BLOCK_VARS (block));
|
||
current_binding_level->blocks = chainon (current_binding_level->blocks,
|
||
BLOCK_SUBBLOCKS (block));
|
||
}
|
||
|
||
void
|
||
push_label_level ()
|
||
{
|
||
struct binding_level *newlevel;
|
||
|
||
newlevel = make_binding_level ();
|
||
|
||
/* Add this level to the front of the chain (stack) of label levels. */
|
||
|
||
newlevel->level_chain = label_level_chain;
|
||
label_level_chain = newlevel;
|
||
|
||
newlevel->names = named_labels;
|
||
newlevel->shadowed = shadowed_labels;
|
||
named_labels = 0;
|
||
shadowed_labels = 0;
|
||
}
|
||
|
||
void
|
||
pop_label_level ()
|
||
{
|
||
struct binding_level *level = label_level_chain;
|
||
tree link, prev;
|
||
|
||
/* Clear out the definitions of the declared labels in this level.
|
||
Leave in the list any ordinary, non-declared labels. */
|
||
for (link = named_labels, prev = 0; link;)
|
||
{
|
||
if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
|
||
{
|
||
if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
|
||
{
|
||
error_with_decl (TREE_VALUE (link),
|
||
"label `%s' used but not defined");
|
||
/* Avoid crashing later. */
|
||
define_label (input_filename, lineno,
|
||
DECL_NAME (TREE_VALUE (link)));
|
||
}
|
||
else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
|
||
warning_with_decl (TREE_VALUE (link),
|
||
"label `%s' defined but not used");
|
||
IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
|
||
|
||
/* Delete this element from the list. */
|
||
link = TREE_CHAIN (link);
|
||
if (prev)
|
||
TREE_CHAIN (prev) = link;
|
||
else
|
||
named_labels = link;
|
||
}
|
||
else
|
||
{
|
||
prev = link;
|
||
link = TREE_CHAIN (link);
|
||
}
|
||
}
|
||
|
||
/* Bring back all the labels that were shadowed. */
|
||
for (link = shadowed_labels; link; link = TREE_CHAIN (link))
|
||
if (DECL_NAME (TREE_VALUE (link)) != 0)
|
||
IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
|
||
= TREE_VALUE (link);
|
||
|
||
named_labels = chainon (named_labels, level->names);
|
||
shadowed_labels = level->shadowed;
|
||
|
||
/* Pop the current level, and free the structure for reuse. */
|
||
pop_binding_level (&label_level_chain);
|
||
}
|
||
|
||
/* Push a definition or a declaration of struct, union or enum tag "name".
|
||
"type" should be the type node.
|
||
We assume that the tag "name" is not already defined.
|
||
|
||
Note that the definition may really be just a forward reference.
|
||
In that case, the TYPE_SIZE will be zero. */
|
||
|
||
void
|
||
pushtag (name, type)
|
||
tree name, type;
|
||
{
|
||
struct binding_level *b;
|
||
|
||
/* Find the proper binding level for this type tag. */
|
||
|
||
for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
|
||
continue;
|
||
|
||
if (name)
|
||
{
|
||
/* Record the identifier as the type's name if it has none. */
|
||
|
||
if (TYPE_NAME (type) == 0)
|
||
TYPE_NAME (type) = name;
|
||
}
|
||
|
||
b->tags = tree_cons (name, type, b->tags);
|
||
|
||
/* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
|
||
tagged type we just added to the current binding level. This fake
|
||
NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
|
||
to output a representation of a tagged type, and it also gives
|
||
us a convenient place to record the "scope start" address for the
|
||
tagged type. */
|
||
|
||
TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
|
||
|
||
/* An approximation for now, so we can tell this is a function-scope tag.
|
||
This will be updated in poplevel. */
|
||
TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
|
||
}
|
||
|
||
/* Handle when a new declaration NEWDECL
|
||
has the same name as an old one OLDDECL
|
||
in the same binding contour.
|
||
Prints an error message if appropriate.
|
||
|
||
If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
|
||
Otherwise, return 0.
|
||
|
||
When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
|
||
and OLDDECL is in an outer binding level and should thus not be changed. */
|
||
|
||
static int
|
||
duplicate_decls (newdecl, olddecl, different_binding_level)
|
||
tree newdecl, olddecl;
|
||
int different_binding_level;
|
||
{
|
||
int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
|
||
int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
|
||
&& DECL_INITIAL (newdecl) != 0);
|
||
tree oldtype = TREE_TYPE (olddecl);
|
||
tree newtype = TREE_TYPE (newdecl);
|
||
int errmsg = 0;
|
||
|
||
if (DECL_P (olddecl))
|
||
{
|
||
if (TREE_CODE (newdecl) == FUNCTION_DECL
|
||
&& TREE_CODE (olddecl) == FUNCTION_DECL
|
||
&& (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
|
||
{
|
||
if (DECL_DECLARED_INLINE_P (newdecl)
|
||
&& DECL_UNINLINABLE (newdecl)
|
||
&& lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
|
||
/* Already warned elsewhere. */;
|
||
else if (DECL_DECLARED_INLINE_P (olddecl)
|
||
&& DECL_UNINLINABLE (olddecl)
|
||
&& lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
|
||
/* Already warned. */;
|
||
else if (DECL_DECLARED_INLINE_P (newdecl)
|
||
&& ! DECL_DECLARED_INLINE_P (olddecl)
|
||
&& DECL_UNINLINABLE (olddecl)
|
||
&& lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
|
||
{
|
||
warning_with_decl (newdecl,
|
||
"function `%s' redeclared as inline");
|
||
warning_with_decl (olddecl,
|
||
"previous declaration of function `%s' with attribute noinline");
|
||
}
|
||
else if (DECL_DECLARED_INLINE_P (olddecl)
|
||
&& DECL_UNINLINABLE (newdecl)
|
||
&& lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
|
||
{
|
||
warning_with_decl (newdecl,
|
||
"function `%s' redeclared with attribute noinline");
|
||
warning_with_decl (olddecl,
|
||
"previous declaration of function `%s' was inline");
|
||
}
|
||
}
|
||
|
||
DECL_ATTRIBUTES (newdecl)
|
||
= (*targetm.merge_decl_attributes) (olddecl, newdecl);
|
||
}
|
||
|
||
if (TREE_CODE (newtype) == ERROR_MARK
|
||
|| TREE_CODE (oldtype) == ERROR_MARK)
|
||
types_match = 0;
|
||
|
||
/* New decl is completely inconsistent with the old one =>
|
||
tell caller to replace the old one.
|
||
This is always an error except in the case of shadowing a builtin. */
|
||
if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
|
||
{
|
||
if (TREE_CODE (olddecl) == FUNCTION_DECL
|
||
&& (DECL_BUILT_IN (olddecl)
|
||
|| DECL_BUILT_IN_NONANSI (olddecl)))
|
||
{
|
||
/* If you declare a built-in or predefined function name as static,
|
||
the old definition is overridden,
|
||
but optionally warn this was a bad choice of name. */
|
||
if (!TREE_PUBLIC (newdecl))
|
||
{
|
||
if (!warn_shadow)
|
||
;
|
||
else if (DECL_BUILT_IN (olddecl))
|
||
warning_with_decl (newdecl, "shadowing built-in function `%s'");
|
||
else
|
||
warning_with_decl (newdecl, "shadowing library function `%s'");
|
||
}
|
||
/* Likewise, if the built-in is not ansi, then programs can
|
||
override it even globally without an error. */
|
||
else if (! DECL_BUILT_IN (olddecl))
|
||
warning_with_decl (newdecl,
|
||
"library function `%s' declared as non-function");
|
||
|
||
else if (DECL_BUILT_IN_NONANSI (olddecl))
|
||
warning_with_decl (newdecl,
|
||
"built-in function `%s' declared as non-function");
|
||
else
|
||
warning_with_decl (newdecl,
|
||
"built-in function `%s' declared as non-function");
|
||
}
|
||
else
|
||
{
|
||
error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
|
||
error_with_decl (olddecl, "previous declaration of `%s'");
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* For real parm decl following a forward decl,
|
||
return 1 so old decl will be reused. */
|
||
if (types_match && TREE_CODE (newdecl) == PARM_DECL
|
||
&& TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
|
||
return 1;
|
||
|
||
/* The new declaration is the same kind of object as the old one.
|
||
The declarations may partially match. Print warnings if they don't
|
||
match enough. Ultimately, copy most of the information from the new
|
||
decl to the old one, and keep using the old one. */
|
||
|
||
if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
|
||
{
|
||
/* A function declaration for a built-in function. */
|
||
if (!TREE_PUBLIC (newdecl))
|
||
{
|
||
/* If you declare a built-in function name as static, the
|
||
built-in definition is overridden,
|
||
but optionally warn this was a bad choice of name. */
|
||
if (warn_shadow)
|
||
warning_with_decl (newdecl, "shadowing built-in function `%s'");
|
||
/* Discard the old built-in function. */
|
||
return 0;
|
||
}
|
||
else if (!types_match)
|
||
{
|
||
/* Accept the return type of the new declaration if same modes. */
|
||
tree oldreturntype = TREE_TYPE (oldtype);
|
||
tree newreturntype = TREE_TYPE (newtype);
|
||
|
||
if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
|
||
{
|
||
/* Function types may be shared, so we can't just modify
|
||
the return type of olddecl's function type. */
|
||
tree trytype
|
||
= build_function_type (newreturntype,
|
||
TYPE_ARG_TYPES (oldtype));
|
||
trytype = build_type_attribute_variant (trytype,
|
||
TYPE_ATTRIBUTES (oldtype));
|
||
|
||
types_match = comptypes (newtype, trytype);
|
||
if (types_match)
|
||
oldtype = trytype;
|
||
}
|
||
/* Accept harmless mismatch in first argument type also.
|
||
This is for the ffs and fprintf builtins. */
|
||
if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
|
||
&& TYPE_ARG_TYPES (oldtype) != 0
|
||
&& TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
|
||
&& TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
|
||
&& (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
|
||
== TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
|
||
{
|
||
/* Function types may be shared, so we can't just modify
|
||
the return type of olddecl's function type. */
|
||
tree trytype
|
||
= build_function_type (TREE_TYPE (oldtype),
|
||
tree_cons (NULL_TREE,
|
||
TREE_VALUE (TYPE_ARG_TYPES (newtype)),
|
||
TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
|
||
trytype = build_type_attribute_variant (trytype,
|
||
TYPE_ATTRIBUTES (oldtype));
|
||
|
||
types_match = comptypes (newtype, trytype);
|
||
if (types_match)
|
||
oldtype = trytype;
|
||
}
|
||
if (! different_binding_level)
|
||
TREE_TYPE (olddecl) = oldtype;
|
||
}
|
||
else if (TYPE_ARG_TYPES (oldtype) == NULL
|
||
&& TYPE_ARG_TYPES (newtype) != NULL)
|
||
{
|
||
/* For bcmp, bzero, fputs the builtin type has arguments not
|
||
specified. Use the ones from the prototype so that type checking
|
||
is done for them. */
|
||
tree trytype
|
||
= build_function_type (TREE_TYPE (oldtype),
|
||
TYPE_ARG_TYPES (newtype));
|
||
trytype = build_type_attribute_variant (trytype,
|
||
TYPE_ATTRIBUTES (oldtype));
|
||
|
||
oldtype = trytype;
|
||
if (! different_binding_level)
|
||
TREE_TYPE (olddecl) = oldtype;
|
||
}
|
||
if (!types_match)
|
||
{
|
||
/* If types don't match for a built-in, throw away the built-in. */
|
||
warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
|
||
return 0;
|
||
}
|
||
}
|
||
else if (TREE_CODE (olddecl) == FUNCTION_DECL
|
||
&& DECL_SOURCE_LINE (olddecl) == 0)
|
||
{
|
||
/* A function declaration for a predeclared function
|
||
that isn't actually built in. */
|
||
if (!TREE_PUBLIC (newdecl))
|
||
{
|
||
/* If you declare it as static, the
|
||
default definition is overridden. */
|
||
return 0;
|
||
}
|
||
else if (!types_match)
|
||
{
|
||
/* If the types don't match, preserve volatility indication.
|
||
Later on, we will discard everything else about the
|
||
default declaration. */
|
||
TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
|
||
}
|
||
}
|
||
/* Permit char *foo () to match void *foo (...) if not pedantic,
|
||
if one of them came from a system header file. */
|
||
else if (!types_match
|
||
&& TREE_CODE (olddecl) == FUNCTION_DECL
|
||
&& TREE_CODE (newdecl) == FUNCTION_DECL
|
||
&& TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
|
||
&& TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
|
||
&& (DECL_IN_SYSTEM_HEADER (olddecl)
|
||
|| DECL_IN_SYSTEM_HEADER (newdecl))
|
||
&& ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
|
||
&& TYPE_ARG_TYPES (oldtype) == 0
|
||
&& self_promoting_args_p (TYPE_ARG_TYPES (newtype))
|
||
&& TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
|
||
||
|
||
(TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
|
||
&& TYPE_ARG_TYPES (newtype) == 0
|
||
&& self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
|
||
&& TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
|
||
{
|
||
if (pedantic)
|
||
pedwarn_with_decl (newdecl, "conflicting types for `%s'");
|
||
/* Make sure we keep void * as ret type, not char *. */
|
||
if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
|
||
TREE_TYPE (newdecl) = newtype = oldtype;
|
||
|
||
/* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
|
||
we will come back here again. */
|
||
DECL_IN_SYSTEM_HEADER (newdecl) = 1;
|
||
}
|
||
else if (!types_match
|
||
/* Permit char *foo (int, ...); followed by char *foo ();
|
||
if not pedantic. */
|
||
&& ! (TREE_CODE (olddecl) == FUNCTION_DECL
|
||
&& ! pedantic
|
||
/* Return types must still match. */
|
||
&& comptypes (TREE_TYPE (oldtype),
|
||
TREE_TYPE (newtype))
|
||
&& TYPE_ARG_TYPES (newtype) == 0))
|
||
{
|
||
error_with_decl (newdecl, "conflicting types for `%s'");
|
||
/* Check for function type mismatch
|
||
involving an empty arglist vs a nonempty one. */
|
||
if (TREE_CODE (olddecl) == FUNCTION_DECL
|
||
&& comptypes (TREE_TYPE (oldtype),
|
||
TREE_TYPE (newtype))
|
||
&& ((TYPE_ARG_TYPES (oldtype) == 0
|
||
&& DECL_INITIAL (olddecl) == 0)
|
||
||
|
||
(TYPE_ARG_TYPES (newtype) == 0
|
||
&& DECL_INITIAL (newdecl) == 0)))
|
||
{
|
||
/* Classify the problem further. */
|
||
tree t = TYPE_ARG_TYPES (oldtype);
|
||
if (t == 0)
|
||
t = TYPE_ARG_TYPES (newtype);
|
||
for (; t; t = TREE_CHAIN (t))
|
||
{
|
||
tree type = TREE_VALUE (t);
|
||
|
||
if (TREE_CHAIN (t) == 0
|
||
&& TYPE_MAIN_VARIANT (type) != void_type_node)
|
||
{
|
||
error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
|
||
break;
|
||
}
|
||
|
||
if (c_type_promotes_to (type) != type)
|
||
{
|
||
error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
error_with_decl (olddecl, "previous declaration of `%s'");
|
||
|
||
/* This is safer because the initializer might contain references
|
||
to variables that were declared between olddecl and newdecl. This
|
||
will make the initializer invalid for olddecl in case it gets
|
||
assigned to olddecl below. */
|
||
if (TREE_CODE (newdecl) == VAR_DECL)
|
||
DECL_INITIAL (newdecl) = 0;
|
||
}
|
||
/* TLS cannot follow non-TLS declaration. */
|
||
else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
|
||
&& !DECL_THREAD_LOCAL (olddecl) && DECL_THREAD_LOCAL (newdecl))
|
||
{
|
||
error_with_decl (newdecl, "thread-local declaration of `%s' follows non thread-local declaration");
|
||
error_with_decl (olddecl, "previous declaration of `%s'");
|
||
}
|
||
/* non-TLS declaration cannot follow TLS declaration. */
|
||
else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
|
||
&& DECL_THREAD_LOCAL (olddecl) && !DECL_THREAD_LOCAL (newdecl))
|
||
{
|
||
error_with_decl (newdecl, "non thread-local declaration of `%s' follows thread-local declaration");
|
||
error_with_decl (olddecl, "previous declaration of `%s'");
|
||
}
|
||
else
|
||
{
|
||
errmsg = redeclaration_error_message (newdecl, olddecl);
|
||
if (errmsg)
|
||
{
|
||
switch (errmsg)
|
||
{
|
||
case 1:
|
||
error_with_decl (newdecl, "redefinition of `%s'");
|
||
break;
|
||
case 2:
|
||
error_with_decl (newdecl, "redeclaration of `%s'");
|
||
break;
|
||
case 3:
|
||
error_with_decl (newdecl, "conflicting declarations of `%s'");
|
||
break;
|
||
default:
|
||
abort ();
|
||
}
|
||
|
||
error_with_decl (olddecl,
|
||
((DECL_INITIAL (olddecl)
|
||
&& current_binding_level == global_binding_level)
|
||
? "`%s' previously defined here"
|
||
: "`%s' previously declared here"));
|
||
return 0;
|
||
}
|
||
else if (TREE_CODE (newdecl) == TYPE_DECL
|
||
&& (DECL_IN_SYSTEM_HEADER (olddecl)
|
||
|| DECL_IN_SYSTEM_HEADER (newdecl)))
|
||
{
|
||
warning_with_decl (newdecl, "redefinition of `%s'");
|
||
warning_with_decl
|
||
(olddecl,
|
||
((DECL_INITIAL (olddecl)
|
||
&& current_binding_level == global_binding_level)
|
||
? "`%s' previously defined here"
|
||
: "`%s' previously declared here"));
|
||
}
|
||
else if (TREE_CODE (olddecl) == FUNCTION_DECL
|
||
&& DECL_INITIAL (olddecl) != 0
|
||
&& TYPE_ARG_TYPES (oldtype) == 0
|
||
&& TYPE_ARG_TYPES (newtype) != 0
|
||
&& TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
|
||
{
|
||
tree type, parm;
|
||
int nargs;
|
||
/* Prototype decl follows defn w/o prototype. */
|
||
|
||
for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
|
||
type = TYPE_ARG_TYPES (newtype),
|
||
nargs = 1;
|
||
;
|
||
parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
|
||
{
|
||
if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
|
||
&& TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
|
||
{
|
||
warning_with_decl (newdecl, "prototype for `%s' follows");
|
||
warning_with_decl (olddecl, "non-prototype definition here");
|
||
break;
|
||
}
|
||
if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
|
||
|| TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
|
||
{
|
||
error_with_decl (newdecl,
|
||
"prototype for `%s' follows and number of arguments doesn't match");
|
||
error_with_decl (olddecl, "non-prototype definition here");
|
||
errmsg = 1;
|
||
break;
|
||
}
|
||
/* Type for passing arg must be consistent
|
||
with that declared for the arg. */
|
||
if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type)))
|
||
{
|
||
error_with_decl (newdecl,
|
||
"prototype for `%s' follows and argument %d doesn't match",
|
||
nargs);
|
||
error_with_decl (olddecl, "non-prototype definition here");
|
||
errmsg = 1;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
/* Warn about mismatches in various flags. */
|
||
else
|
||
{
|
||
/* Warn if function is now inline
|
||
but was previously declared not inline and has been called. */
|
||
if (TREE_CODE (olddecl) == FUNCTION_DECL
|
||
&& ! DECL_DECLARED_INLINE_P (olddecl)
|
||
&& DECL_DECLARED_INLINE_P (newdecl)
|
||
&& TREE_USED (olddecl))
|
||
warning_with_decl (newdecl,
|
||
"`%s' declared inline after being called");
|
||
if (TREE_CODE (olddecl) == FUNCTION_DECL
|
||
&& ! DECL_DECLARED_INLINE_P (olddecl)
|
||
&& DECL_DECLARED_INLINE_P (newdecl)
|
||
&& DECL_INITIAL (olddecl) != 0)
|
||
warning_with_decl (newdecl,
|
||
"`%s' declared inline after its definition");
|
||
|
||
/* If pedantic, warn when static declaration follows a non-static
|
||
declaration. Otherwise, do so only for functions. */
|
||
if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
|
||
&& TREE_PUBLIC (olddecl)
|
||
&& !TREE_PUBLIC (newdecl))
|
||
warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
|
||
|
||
/* If warn_traditional, warn when a non-static function
|
||
declaration follows a static one. */
|
||
if (warn_traditional && !in_system_header
|
||
&& TREE_CODE (olddecl) == FUNCTION_DECL
|
||
&& !TREE_PUBLIC (olddecl)
|
||
&& TREE_PUBLIC (newdecl))
|
||
warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
|
||
|
||
/* Warn when const declaration follows a non-const
|
||
declaration, but not for functions. */
|
||
if (TREE_CODE (olddecl) != FUNCTION_DECL
|
||
&& !TREE_READONLY (olddecl)
|
||
&& TREE_READONLY (newdecl))
|
||
warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
|
||
/* These bits are logically part of the type, for variables.
|
||
But not for functions
|
||
(where qualifiers are not valid ANSI anyway). */
|
||
else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
|
||
&& (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
|
||
|| TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
|
||
pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
|
||
}
|
||
}
|
||
|
||
/* Optionally warn about more than one declaration for the same name. */
|
||
if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
|
||
/* Don't warn about a function declaration
|
||
followed by a definition. */
|
||
&& !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
|
||
&& DECL_INITIAL (olddecl) == 0)
|
||
/* Don't warn about extern decl followed by (tentative) definition. */
|
||
&& !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
|
||
{
|
||
warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
|
||
warning_with_decl (olddecl, "previous declaration of `%s'");
|
||
}
|
||
|
||
/* Copy all the DECL_... slots specified in the new decl
|
||
except for any that we copy here from the old type.
|
||
|
||
Past this point, we don't change OLDTYPE and NEWTYPE
|
||
even if we change the types of NEWDECL and OLDDECL. */
|
||
|
||
if (types_match)
|
||
{
|
||
/* When copying info to olddecl, we store into write_olddecl
|
||
instead. This allows us to avoid modifying olddecl when
|
||
different_binding_level is true. */
|
||
tree write_olddecl = different_binding_level ? newdecl : olddecl;
|
||
|
||
/* Merge the data types specified in the two decls. */
|
||
if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
|
||
{
|
||
if (different_binding_level)
|
||
{
|
||
if (TYPE_ARG_TYPES (oldtype) != 0
|
||
&& TYPE_ARG_TYPES (newtype) == 0)
|
||
TREE_TYPE (newdecl) = common_type (newtype, oldtype);
|
||
else
|
||
TREE_TYPE (newdecl)
|
||
= build_type_attribute_variant
|
||
(newtype,
|
||
merge_attributes (TYPE_ATTRIBUTES (newtype),
|
||
TYPE_ATTRIBUTES (oldtype)));
|
||
}
|
||
else
|
||
TREE_TYPE (newdecl)
|
||
= TREE_TYPE (olddecl)
|
||
= common_type (newtype, oldtype);
|
||
}
|
||
|
||
/* Lay the type out, unless already done. */
|
||
if (oldtype != TREE_TYPE (newdecl))
|
||
{
|
||
if (TREE_TYPE (newdecl) != error_mark_node)
|
||
layout_type (TREE_TYPE (newdecl));
|
||
if (TREE_CODE (newdecl) != FUNCTION_DECL
|
||
&& TREE_CODE (newdecl) != TYPE_DECL
|
||
&& TREE_CODE (newdecl) != CONST_DECL)
|
||
layout_decl (newdecl, 0);
|
||
}
|
||
else
|
||
{
|
||
/* Since the type is OLDDECL's, make OLDDECL's size go with. */
|
||
DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
|
||
DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
|
||
DECL_MODE (newdecl) = DECL_MODE (olddecl);
|
||
if (TREE_CODE (olddecl) != FUNCTION_DECL)
|
||
if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
|
||
{
|
||
DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
|
||
DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
|
||
}
|
||
}
|
||
|
||
/* Keep the old rtl since we can safely use it. */
|
||
COPY_DECL_RTL (olddecl, newdecl);
|
||
|
||
/* Merge the type qualifiers. */
|
||
if (TREE_READONLY (newdecl))
|
||
TREE_READONLY (write_olddecl) = 1;
|
||
|
||
if (TREE_THIS_VOLATILE (newdecl))
|
||
{
|
||
TREE_THIS_VOLATILE (write_olddecl) = 1;
|
||
if (TREE_CODE (newdecl) == VAR_DECL
|
||
/* If an automatic variable is re-declared in the same
|
||
function scope, but the old declaration was not
|
||
volatile, make_var_volatile() would crash because the
|
||
variable would have been assigned to a pseudo, not a
|
||
MEM. Since this duplicate declaration is invalid
|
||
anyway, we just skip the call. */
|
||
&& errmsg == 0)
|
||
make_var_volatile (newdecl);
|
||
}
|
||
|
||
/* Keep source location of definition rather than declaration. */
|
||
/* When called with different_binding_level set, keep the old
|
||
information so that meaningful diagnostics can be given. */
|
||
if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
|
||
&& ! different_binding_level)
|
||
{
|
||
DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
|
||
DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
|
||
}
|
||
|
||
/* Merge the unused-warning information. */
|
||
if (DECL_IN_SYSTEM_HEADER (olddecl))
|
||
DECL_IN_SYSTEM_HEADER (newdecl) = 1;
|
||
else if (DECL_IN_SYSTEM_HEADER (newdecl))
|
||
DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
|
||
|
||
/* Merge the initialization information. */
|
||
/* When called with different_binding_level set, don't copy over
|
||
DECL_INITIAL, so that we don't accidentally change function
|
||
declarations into function definitions. */
|
||
if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
|
||
DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
|
||
|
||
/* Merge the section attribute.
|
||
We want to issue an error if the sections conflict but that must be
|
||
done later in decl_attributes since we are called before attributes
|
||
are assigned. */
|
||
if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
|
||
DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
|
||
|
||
/* Copy the assembler name.
|
||
Currently, it can only be defined in the prototype. */
|
||
COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
|
||
|
||
if (TREE_CODE (newdecl) == FUNCTION_DECL)
|
||
{
|
||
DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
|
||
DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
|
||
DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
|
||
DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
|
||
|= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
|
||
}
|
||
}
|
||
/* If cannot merge, then use the new type and qualifiers,
|
||
and don't preserve the old rtl. */
|
||
else if (! different_binding_level)
|
||
{
|
||
TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
|
||
TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
|
||
TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
|
||
TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
|
||
}
|
||
|
||
/* Merge the storage class information. */
|
||
merge_weak (newdecl, olddecl);
|
||
|
||
/* For functions, static overrides non-static. */
|
||
if (TREE_CODE (newdecl) == FUNCTION_DECL)
|
||
{
|
||
TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
|
||
/* This is since we don't automatically
|
||
copy the attributes of NEWDECL into OLDDECL. */
|
||
/* No need to worry about different_binding_level here because
|
||
then TREE_PUBLIC (newdecl) was true. */
|
||
TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
|
||
/* If this clears `static', clear it in the identifier too. */
|
||
if (! TREE_PUBLIC (olddecl))
|
||
TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
|
||
}
|
||
if (DECL_EXTERNAL (newdecl))
|
||
{
|
||
if (! different_binding_level)
|
||
{
|
||
/* Don't mess with these flags on local externs; they remain
|
||
external even if there's a declaration at file scope which
|
||
isn't. */
|
||
TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
|
||
DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
|
||
}
|
||
/* An extern decl does not override previous storage class. */
|
||
TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
|
||
if (! DECL_EXTERNAL (newdecl))
|
||
DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
|
||
}
|
||
else
|
||
{
|
||
TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
|
||
TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
|
||
}
|
||
|
||
if (TREE_CODE (newdecl) == FUNCTION_DECL)
|
||
{
|
||
/* If we're redefining a function previously defined as extern
|
||
inline, make sure we emit debug info for the inline before we
|
||
throw it away, in case it was inlined into a function that hasn't
|
||
been written out yet. */
|
||
if (new_is_definition && DECL_INITIAL (olddecl))
|
||
{
|
||
if (TREE_USED (olddecl))
|
||
(*debug_hooks->outlining_inline_function) (olddecl);
|
||
|
||
/* The new defn must not be inline. */
|
||
DECL_INLINE (newdecl) = 0;
|
||
DECL_UNINLINABLE (newdecl) = 1;
|
||
}
|
||
else
|
||
{
|
||
/* If either decl says `inline', this fn is inline,
|
||
unless its definition was passed already. */
|
||
if (DECL_DECLARED_INLINE_P (newdecl)
|
||
|| DECL_DECLARED_INLINE_P (olddecl))
|
||
DECL_DECLARED_INLINE_P (newdecl) = 1;
|
||
|
||
DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
|
||
= (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
|
||
}
|
||
|
||
if (DECL_BUILT_IN (olddecl))
|
||
{
|
||
/* Get rid of any built-in function if new arg types don't match it
|
||
or if we have a function definition. */
|
||
if (! types_match || new_is_definition)
|
||
{
|
||
if (! different_binding_level)
|
||
{
|
||
TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
|
||
DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* If redeclaring a builtin function, and not a definition,
|
||
it stays built in. */
|
||
DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
|
||
DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
|
||
}
|
||
}
|
||
|
||
/* Also preserve various other info from the definition. */
|
||
if (! new_is_definition)
|
||
{
|
||
DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
|
||
/* When called with different_binding_level set, don't copy over
|
||
DECL_INITIAL, so that we don't accidentally change function
|
||
declarations into function definitions. */
|
||
if (! different_binding_level)
|
||
DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
|
||
DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
|
||
DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
|
||
DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
|
||
DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
|
||
|
||
/* Set DECL_INLINE on the declaration if we've got a body
|
||
from which to instantiate. */
|
||
if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
|
||
{
|
||
DECL_INLINE (newdecl) = 1;
|
||
DECL_ABSTRACT_ORIGIN (newdecl)
|
||
= (different_binding_level
|
||
? DECL_ORIGIN (olddecl)
|
||
: DECL_ABSTRACT_ORIGIN (olddecl));
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* If a previous declaration said inline, mark the
|
||
definition as inlinable. */
|
||
if (DECL_DECLARED_INLINE_P (newdecl)
|
||
&& ! DECL_UNINLINABLE (newdecl))
|
||
DECL_INLINE (newdecl) = 1;
|
||
}
|
||
}
|
||
if (different_binding_level)
|
||
return 0;
|
||
|
||
/* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
|
||
But preserve OLDDECL's DECL_UID. */
|
||
{
|
||
unsigned olddecl_uid = DECL_UID (olddecl);
|
||
|
||
memcpy ((char *) olddecl + sizeof (struct tree_common),
|
||
(char *) newdecl + sizeof (struct tree_common),
|
||
sizeof (struct tree_decl) - sizeof (struct tree_common));
|
||
DECL_UID (olddecl) = olddecl_uid;
|
||
}
|
||
|
||
/* NEWDECL contains the merged attribute lists.
|
||
Update OLDDECL to be the same. */
|
||
DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
|
||
|
||
/* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
|
||
so that encode_section_info has a chance to look at the new decl
|
||
flags and attributes. */
|
||
if (DECL_RTL_SET_P (olddecl)
|
||
&& (TREE_CODE (olddecl) == FUNCTION_DECL
|
||
|| (TREE_CODE (olddecl) == VAR_DECL
|
||
&& TREE_STATIC (olddecl))))
|
||
make_decl_rtl (olddecl, NULL);
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* Check whether decl-node X shadows an existing declaration.
|
||
OLDLOCAL is the old IDENTIFIER_LOCAL_VALUE of the DECL_NAME of X,
|
||
which might be a NULL_TREE. */
|
||
static void
|
||
warn_if_shadowing (x, oldlocal)
|
||
tree x, oldlocal;
|
||
{
|
||
tree name;
|
||
|
||
if (DECL_EXTERNAL (x))
|
||
return;
|
||
|
||
name = DECL_NAME (x);
|
||
|
||
/* Warn if shadowing an argument at the top level of the body. */
|
||
if (oldlocal != 0
|
||
/* This warning doesn't apply to the parms of a nested fcn. */
|
||
&& ! current_binding_level->parm_flag
|
||
/* Check that this is one level down from the parms. */
|
||
&& current_binding_level->level_chain->parm_flag
|
||
/* Check that the decl being shadowed
|
||
comes from the parm level, one level up. */
|
||
&& chain_member (oldlocal, current_binding_level->level_chain->names))
|
||
{
|
||
if (TREE_CODE (oldlocal) == PARM_DECL)
|
||
pedwarn ("declaration of `%s' shadows a parameter",
|
||
IDENTIFIER_POINTER (name));
|
||
else
|
||
pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
|
||
IDENTIFIER_POINTER (name));
|
||
}
|
||
/* Maybe warn if shadowing something else. */
|
||
else if (warn_shadow
|
||
/* No shadow warnings for internally generated vars. */
|
||
&& DECL_SOURCE_LINE (x) != 0
|
||
/* No shadow warnings for vars made for inlining. */
|
||
&& ! DECL_FROM_INLINE (x))
|
||
{
|
||
if (TREE_CODE (x) == PARM_DECL
|
||
&& current_binding_level->level_chain->parm_flag)
|
||
/* Don't warn about the parm names in function declarator
|
||
within a function declarator.
|
||
It would be nice to avoid warning in any function
|
||
declarator in a declaration, as opposed to a definition,
|
||
but there is no way to tell it's not a definition. */
|
||
;
|
||
else if (oldlocal)
|
||
{
|
||
if (TREE_CODE (oldlocal) == PARM_DECL)
|
||
shadow_warning ("a parameter", name, oldlocal);
|
||
else
|
||
shadow_warning ("a previous local", name, oldlocal);
|
||
}
|
||
else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
|
||
&& IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
|
||
shadow_warning ("a global declaration", name,
|
||
IDENTIFIER_GLOBAL_VALUE (name));
|
||
}
|
||
}
|
||
|
||
/* Record a decl-node X as belonging to the current lexical scope.
|
||
Check for errors (such as an incompatible declaration for the same
|
||
name already seen in the same scope).
|
||
|
||
Returns either X or an old decl for the same name.
|
||
If an old decl is returned, it may have been smashed
|
||
to agree with what X says. */
|
||
|
||
tree
|
||
pushdecl (x)
|
||
tree x;
|
||
{
|
||
tree t;
|
||
tree name = DECL_NAME (x);
|
||
struct binding_level *b = current_binding_level;
|
||
|
||
/* Functions need the lang_decl data. */
|
||
if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
|
||
DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
|
||
ggc_alloc_cleared (sizeof (struct lang_decl));
|
||
|
||
DECL_CONTEXT (x) = current_function_decl;
|
||
/* A local extern declaration for a function doesn't constitute nesting.
|
||
A local auto declaration does, since it's a forward decl
|
||
for a nested function coming later. */
|
||
if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
|
||
&& DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
|
||
DECL_CONTEXT (x) = 0;
|
||
|
||
if (name)
|
||
{
|
||
int different_binding_level = 0;
|
||
|
||
if (warn_nested_externs
|
||
&& DECL_EXTERNAL (x)
|
||
&& b != global_binding_level
|
||
&& x != IDENTIFIER_IMPLICIT_DECL (name)
|
||
/* No error messages for __FUNCTION__ and __PRETTY_FUNCTION__. */
|
||
&& !DECL_IN_SYSTEM_HEADER (x))
|
||
warning ("nested extern declaration of `%s'",
|
||
IDENTIFIER_POINTER (name));
|
||
|
||
t = lookup_name_current_level (name);
|
||
if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
|
||
{
|
||
t = IDENTIFIER_GLOBAL_VALUE (name);
|
||
/* Type decls at global scope don't conflict with externs declared
|
||
inside lexical blocks. */
|
||
if (! t || TREE_CODE (t) == TYPE_DECL)
|
||
/* If there's no visible global declaration, try for an
|
||
invisible one. */
|
||
t = IDENTIFIER_LIMBO_VALUE (name);
|
||
different_binding_level = 1;
|
||
}
|
||
if (t != 0 && t == error_mark_node)
|
||
/* error_mark_node is 0 for a while during initialization! */
|
||
{
|
||
t = 0;
|
||
error_with_decl (x, "`%s' used prior to declaration");
|
||
}
|
||
|
||
/* If this decl is `static' and an implicit decl was seen previously,
|
||
warn. */
|
||
if (TREE_PUBLIC (name)
|
||
/* Don't test for DECL_EXTERNAL, because grokdeclarator
|
||
sets this for all functions. */
|
||
&& ! TREE_PUBLIC (x)
|
||
&& (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
|
||
/* We used to warn also for explicit extern followed by static,
|
||
but sometimes you need to do it that way. */
|
||
&& IDENTIFIER_IMPLICIT_DECL (name) != 0)
|
||
{
|
||
pedwarn ("`%s' was declared implicitly `extern' and later `static'",
|
||
IDENTIFIER_POINTER (name));
|
||
pedwarn_with_file_and_line
|
||
(DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
|
||
DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
|
||
"previous declaration of `%s'",
|
||
IDENTIFIER_POINTER (name));
|
||
TREE_THIS_VOLATILE (name) = 1;
|
||
}
|
||
|
||
if (t != 0 && duplicate_decls (x, t, different_binding_level))
|
||
{
|
||
if (TREE_CODE (t) == PARM_DECL)
|
||
{
|
||
/* Don't allow more than one "real" duplicate
|
||
of a forward parm decl. */
|
||
TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
|
||
return t;
|
||
}
|
||
return t;
|
||
}
|
||
|
||
/* If we are processing a typedef statement, generate a whole new
|
||
..._TYPE node (which will be just a variant of the existing
|
||
..._TYPE node with identical properties) and then install the
|
||
TYPE_DECL node generated to represent the typedef name as the
|
||
TYPE_NAME of this brand new (duplicate) ..._TYPE node.
|
||
|
||
The whole point here is to end up with a situation where each
|
||
and every ..._TYPE node the compiler creates will be uniquely
|
||
associated with AT MOST one node representing a typedef name.
|
||
This way, even though the compiler substitutes corresponding
|
||
..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
|
||
early on, later parts of the compiler can always do the reverse
|
||
translation and get back the corresponding typedef name. For
|
||
example, given:
|
||
|
||
typedef struct S MY_TYPE;
|
||
MY_TYPE object;
|
||
|
||
Later parts of the compiler might only know that `object' was of
|
||
type `struct S' if it were not for code just below. With this
|
||
code however, later parts of the compiler see something like:
|
||
|
||
struct S' == struct S
|
||
typedef struct S' MY_TYPE;
|
||
struct S' object;
|
||
|
||
And they can then deduce (from the node for type struct S') that
|
||
the original object declaration was:
|
||
|
||
MY_TYPE object;
|
||
|
||
Being able to do this is important for proper support of protoize,
|
||
and also for generating precise symbolic debugging information
|
||
which takes full account of the programmer's (typedef) vocabulary.
|
||
|
||
Obviously, we don't want to generate a duplicate ..._TYPE node if
|
||
the TYPE_DECL node that we are now processing really represents a
|
||
standard built-in type.
|
||
|
||
Since all standard types are effectively declared at line zero
|
||
in the source file, we can easily check to see if we are working
|
||
on a standard type by checking the current value of lineno. */
|
||
|
||
if (TREE_CODE (x) == TYPE_DECL)
|
||
{
|
||
if (DECL_SOURCE_LINE (x) == 0)
|
||
{
|
||
if (TYPE_NAME (TREE_TYPE (x)) == 0)
|
||
TYPE_NAME (TREE_TYPE (x)) = x;
|
||
}
|
||
else if (TREE_TYPE (x) != error_mark_node
|
||
&& DECL_ORIGINAL_TYPE (x) == NULL_TREE)
|
||
{
|
||
tree tt = TREE_TYPE (x);
|
||
DECL_ORIGINAL_TYPE (x) = tt;
|
||
tt = build_type_copy (tt);
|
||
TYPE_NAME (tt) = x;
|
||
TREE_USED (tt) = TREE_USED (x);
|
||
TREE_TYPE (x) = tt;
|
||
}
|
||
}
|
||
|
||
/* Multiple external decls of the same identifier ought to match.
|
||
We get warnings about inline functions where they are defined.
|
||
Avoid duplicate warnings where they are used. */
|
||
if (TREE_PUBLIC (x)
|
||
&& ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
|
||
{
|
||
tree decl;
|
||
|
||
if (IDENTIFIER_LIMBO_VALUE (name) != 0)
|
||
/* Decls in limbo are always extern, so no need to check that. */
|
||
decl = IDENTIFIER_LIMBO_VALUE (name);
|
||
else
|
||
decl = 0;
|
||
|
||
if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
|
||
/* If old decl is built-in, we already warned if we should. */
|
||
&& !DECL_BUILT_IN (decl))
|
||
{
|
||
pedwarn_with_decl (x,
|
||
"type mismatch with previous external decl");
|
||
pedwarn_with_decl (decl, "previous external decl of `%s'");
|
||
}
|
||
}
|
||
|
||
/* If a function has had an implicit declaration, and then is defined,
|
||
make sure they are compatible. */
|
||
|
||
if (IDENTIFIER_IMPLICIT_DECL (name) != 0
|
||
&& IDENTIFIER_GLOBAL_VALUE (name) == 0
|
||
&& TREE_CODE (x) == FUNCTION_DECL
|
||
&& ! comptypes (TREE_TYPE (x),
|
||
TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
|
||
{
|
||
warning_with_decl (x, "type mismatch with previous implicit declaration");
|
||
warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
|
||
"previous implicit declaration of `%s'");
|
||
}
|
||
|
||
/* This name is new in its binding level.
|
||
Install the new declaration and return it. */
|
||
if (b == global_binding_level)
|
||
{
|
||
/* Install a global value. */
|
||
|
||
/* If the first global decl has external linkage,
|
||
warn if we later see static one. */
|
||
if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
|
||
TREE_PUBLIC (name) = 1;
|
||
|
||
IDENTIFIER_GLOBAL_VALUE (name) = x;
|
||
|
||
/* We no longer care about any previous block level declarations. */
|
||
IDENTIFIER_LIMBO_VALUE (name) = 0;
|
||
|
||
/* Don't forget if the function was used via an implicit decl. */
|
||
if (IDENTIFIER_IMPLICIT_DECL (name)
|
||
&& TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
|
||
TREE_USED (x) = 1, TREE_USED (name) = 1;
|
||
|
||
/* Don't forget if its address was taken in that way. */
|
||
if (IDENTIFIER_IMPLICIT_DECL (name)
|
||
&& TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
|
||
TREE_ADDRESSABLE (x) = 1;
|
||
|
||
/* Warn about mismatches against previous implicit decl. */
|
||
if (IDENTIFIER_IMPLICIT_DECL (name) != 0
|
||
/* If this real decl matches the implicit, don't complain. */
|
||
&& ! (TREE_CODE (x) == FUNCTION_DECL
|
||
&& (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
|
||
== integer_type_node)))
|
||
pedwarn ("`%s' was previously implicitly declared to return `int'",
|
||
IDENTIFIER_POINTER (name));
|
||
|
||
/* If this decl is `static' and an `extern' was seen previously,
|
||
that is erroneous. */
|
||
if (TREE_PUBLIC (name)
|
||
&& ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
|
||
{
|
||
/* Okay to redeclare an ANSI built-in as static. */
|
||
if (t != 0 && DECL_BUILT_IN (t))
|
||
;
|
||
/* Okay to declare a non-ANSI built-in as anything. */
|
||
else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
|
||
;
|
||
/* Okay to have global type decl after an earlier extern
|
||
declaration inside a lexical block. */
|
||
else if (TREE_CODE (x) == TYPE_DECL)
|
||
;
|
||
else if (IDENTIFIER_IMPLICIT_DECL (name))
|
||
{
|
||
if (! TREE_THIS_VOLATILE (name))
|
||
pedwarn ("`%s' was declared implicitly `extern' and later `static'",
|
||
IDENTIFIER_POINTER (name));
|
||
}
|
||
else
|
||
pedwarn ("`%s' was declared `extern' and later `static'",
|
||
IDENTIFIER_POINTER (name));
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* Here to install a non-global value. */
|
||
tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
|
||
tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
|
||
|
||
IDENTIFIER_LOCAL_VALUE (name) = x;
|
||
|
||
/* If this is an extern function declaration, see if we
|
||
have a global definition or declaration for the function. */
|
||
if (oldlocal == 0
|
||
&& oldglobal != 0
|
||
&& TREE_CODE (x) == FUNCTION_DECL
|
||
&& TREE_CODE (oldglobal) == FUNCTION_DECL
|
||
&& DECL_EXTERNAL (x)
|
||
&& ! DECL_DECLARED_INLINE_P (x))
|
||
{
|
||
/* We have one. Their types must agree. */
|
||
if (! comptypes (TREE_TYPE (x),
|
||
TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
|
||
pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
|
||
else
|
||
{
|
||
/* Inner extern decl is inline if global one is.
|
||
Copy enough to really inline it. */
|
||
if (DECL_DECLARED_INLINE_P (oldglobal))
|
||
{
|
||
DECL_DECLARED_INLINE_P (x)
|
||
= DECL_DECLARED_INLINE_P (oldglobal);
|
||
DECL_INLINE (x) = DECL_INLINE (oldglobal);
|
||
DECL_INITIAL (x) = (current_function_decl == oldglobal
|
||
? 0 : DECL_INITIAL (oldglobal));
|
||
DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
|
||
DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
|
||
DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
|
||
DECL_RESULT (x) = DECL_RESULT (oldglobal);
|
||
TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
|
||
DECL_ABSTRACT_ORIGIN (x)
|
||
= DECL_ABSTRACT_ORIGIN (oldglobal);
|
||
}
|
||
/* Inner extern decl is built-in if global one is. */
|
||
if (DECL_BUILT_IN (oldglobal))
|
||
{
|
||
DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
|
||
DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
|
||
}
|
||
/* Keep the arg types from a file-scope fcn defn. */
|
||
if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
|
||
&& DECL_INITIAL (oldglobal)
|
||
&& TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
|
||
TREE_TYPE (x) = TREE_TYPE (oldglobal);
|
||
}
|
||
}
|
||
|
||
#if 0
|
||
/* This case is probably sometimes the right thing to do. */
|
||
/* If we have a local external declaration,
|
||
then any file-scope declaration should not
|
||
have been static. */
|
||
if (oldlocal == 0 && oldglobal != 0
|
||
&& !TREE_PUBLIC (oldglobal)
|
||
&& DECL_EXTERNAL (x) && TREE_PUBLIC (x))
|
||
warning ("`%s' locally external but globally static",
|
||
IDENTIFIER_POINTER (name));
|
||
#endif
|
||
|
||
/* If we have a local external declaration,
|
||
and no file-scope declaration has yet been seen,
|
||
then if we later have a file-scope decl it must not be static. */
|
||
if (oldlocal == 0
|
||
&& DECL_EXTERNAL (x)
|
||
&& TREE_PUBLIC (x))
|
||
{
|
||
if (oldglobal == 0)
|
||
TREE_PUBLIC (name) = 1;
|
||
|
||
/* Save this decl, so that we can do type checking against
|
||
other decls after it falls out of scope.
|
||
|
||
Only save it once. This prevents temporary decls created in
|
||
expand_inline_function from being used here, since this
|
||
will have been set when the inline function was parsed.
|
||
It also helps give slightly better warnings. */
|
||
if (IDENTIFIER_LIMBO_VALUE (name) == 0)
|
||
IDENTIFIER_LIMBO_VALUE (name) = x;
|
||
}
|
||
|
||
warn_if_shadowing (x, oldlocal);
|
||
|
||
/* If storing a local value, there may already be one (inherited).
|
||
If so, record it for restoration when this binding level ends. */
|
||
if (oldlocal != 0)
|
||
b->shadowed = tree_cons (name, oldlocal, b->shadowed);
|
||
}
|
||
|
||
/* Keep list of variables in this level with incomplete type.
|
||
If the input is erroneous, we can have error_mark in the type
|
||
slot (e.g. "f(void a, ...)") - that doesn't count as an
|
||
incomplete type. */
|
||
if (TREE_TYPE (x) != error_mark_node
|
||
&& !COMPLETE_TYPE_P (TREE_TYPE (x)))
|
||
{
|
||
tree element = TREE_TYPE (x);
|
||
|
||
while (TREE_CODE (element) == ARRAY_TYPE)
|
||
element = TREE_TYPE (element);
|
||
if (TREE_CODE (element) == RECORD_TYPE
|
||
|| TREE_CODE (element) == UNION_TYPE)
|
||
b->incomplete_list = tree_cons (NULL_TREE, x, b->incomplete_list);
|
||
}
|
||
}
|
||
|
||
/* Put decls on list in reverse order.
|
||
We will reverse them later if necessary. */
|
||
TREE_CHAIN (x) = b->names;
|
||
b->names = x;
|
||
|
||
return x;
|
||
}
|
||
|
||
/* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
|
||
|
||
tree
|
||
pushdecl_top_level (x)
|
||
tree x;
|
||
{
|
||
tree t;
|
||
struct binding_level *b = current_binding_level;
|
||
|
||
current_binding_level = global_binding_level;
|
||
t = pushdecl (x);
|
||
current_binding_level = b;
|
||
return t;
|
||
}
|
||
|
||
/* Generate an implicit declaration for identifier FUNCTIONID
|
||
as a function of type int (). Print a warning if appropriate. */
|
||
|
||
tree
|
||
implicitly_declare (functionid)
|
||
tree functionid;
|
||
{
|
||
tree decl;
|
||
int traditional_warning = 0;
|
||
/* Only one "implicit declaration" warning per identifier. */
|
||
int implicit_warning;
|
||
|
||
/* We used to reuse an old implicit decl here,
|
||
but this loses with inline functions because it can clobber
|
||
the saved decl chains. */
|
||
#if 0
|
||
if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
|
||
decl = IDENTIFIER_IMPLICIT_DECL (functionid);
|
||
else
|
||
#endif
|
||
decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
|
||
|
||
/* Warn of implicit decl following explicit local extern decl.
|
||
This is probably a program designed for traditional C. */
|
||
if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
|
||
traditional_warning = 1;
|
||
|
||
/* Warn once of an implicit declaration. */
|
||
implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
|
||
|
||
DECL_EXTERNAL (decl) = 1;
|
||
TREE_PUBLIC (decl) = 1;
|
||
|
||
/* Record that we have an implicit decl and this is it. */
|
||
IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
|
||
|
||
/* ANSI standard says implicit declarations are in the innermost block.
|
||
So we record the decl in the standard fashion. */
|
||
pushdecl (decl);
|
||
|
||
/* This is a no-op in c-lang.c or something real in objc-act.c. */
|
||
if (flag_objc)
|
||
objc_check_decl (decl);
|
||
|
||
rest_of_decl_compilation (decl, NULL, 0, 0);
|
||
|
||
if (implicit_warning)
|
||
implicit_decl_warning (functionid);
|
||
else if (warn_traditional && traditional_warning)
|
||
warning ("function `%s' was previously declared within a block",
|
||
IDENTIFIER_POINTER (functionid));
|
||
|
||
/* Write a record describing this implicit function declaration to the
|
||
prototypes file (if requested). */
|
||
|
||
gen_aux_info_record (decl, 0, 1, 0);
|
||
|
||
/* Possibly apply some default attributes to this implicit declaration. */
|
||
decl_attributes (&decl, NULL_TREE, 0);
|
||
|
||
return decl;
|
||
}
|
||
|
||
void
|
||
implicit_decl_warning (id)
|
||
tree id;
|
||
{
|
||
const char *name = IDENTIFIER_POINTER (id);
|
||
if (mesg_implicit_function_declaration == 2)
|
||
error ("implicit declaration of function `%s'", name);
|
||
else if (mesg_implicit_function_declaration == 1)
|
||
warning ("implicit declaration of function `%s'", name);
|
||
}
|
||
|
||
/* Return zero if the declaration NEWDECL is valid
|
||
when the declaration OLDDECL (assumed to be for the same name)
|
||
has already been seen.
|
||
Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
|
||
and 3 if it is a conflicting declaration. */
|
||
|
||
static int
|
||
redeclaration_error_message (newdecl, olddecl)
|
||
tree newdecl, olddecl;
|
||
{
|
||
if (TREE_CODE (newdecl) == TYPE_DECL)
|
||
{
|
||
/* Do not complain about type redeclarations where at least one
|
||
declaration was in a system header. */
|
||
if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
|
||
return 0;
|
||
return 1;
|
||
}
|
||
else if (TREE_CODE (newdecl) == FUNCTION_DECL)
|
||
{
|
||
/* Declarations of functions can insist on internal linkage
|
||
but they can't be inconsistent with internal linkage,
|
||
so there can be no error on that account.
|
||
However defining the same name twice is no good. */
|
||
if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
|
||
/* However, defining once as extern inline and a second
|
||
time in another way is ok. */
|
||
&& ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
|
||
&& ! (DECL_DECLARED_INLINE_P (newdecl)
|
||
&& DECL_EXTERNAL (newdecl))))
|
||
return 1;
|
||
return 0;
|
||
}
|
||
else if (DECL_CONTEXT (newdecl) == NULL_TREE)
|
||
{
|
||
/* Objects declared at top level: */
|
||
/* If at least one is a reference, it's ok. */
|
||
if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
|
||
return 0;
|
||
/* Reject two definitions. */
|
||
if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
|
||
return 1;
|
||
/* Now we have two tentative defs, or one tentative and one real def. */
|
||
/* Insist that the linkage match. */
|
||
if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
|
||
return 3;
|
||
return 0;
|
||
}
|
||
else if (current_binding_level->parm_flag
|
||
&& TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
|
||
return 0;
|
||
else
|
||
{
|
||
/* Newdecl has block scope. If olddecl has block scope also, then
|
||
reject two definitions, and reject a definition together with an
|
||
external reference. Otherwise, it is OK, because newdecl must
|
||
be an extern reference to olddecl. */
|
||
if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
|
||
&& DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
|
||
return 2;
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
/* Get the LABEL_DECL corresponding to identifier ID as a label.
|
||
Create one if none exists so far for the current function.
|
||
This function is called for both label definitions and label references. */
|
||
|
||
tree
|
||
lookup_label (id)
|
||
tree id;
|
||
{
|
||
tree decl = IDENTIFIER_LABEL_VALUE (id);
|
||
|
||
if (current_function_decl == 0)
|
||
{
|
||
error ("label %s referenced outside of any function",
|
||
IDENTIFIER_POINTER (id));
|
||
return 0;
|
||
}
|
||
|
||
/* Use a label already defined or ref'd with this name. */
|
||
if (decl != 0)
|
||
{
|
||
/* But not if it is inherited and wasn't declared to be inheritable. */
|
||
if (DECL_CONTEXT (decl) != current_function_decl
|
||
&& ! C_DECLARED_LABEL_FLAG (decl))
|
||
return shadow_label (id);
|
||
return decl;
|
||
}
|
||
|
||
decl = build_decl (LABEL_DECL, id, void_type_node);
|
||
|
||
/* A label not explicitly declared must be local to where it's ref'd. */
|
||
DECL_CONTEXT (decl) = current_function_decl;
|
||
|
||
DECL_MODE (decl) = VOIDmode;
|
||
|
||
/* Say where one reference is to the label,
|
||
for the sake of the error if it is not defined. */
|
||
DECL_SOURCE_LINE (decl) = lineno;
|
||
DECL_SOURCE_FILE (decl) = input_filename;
|
||
|
||
IDENTIFIER_LABEL_VALUE (id) = decl;
|
||
|
||
named_labels = tree_cons (NULL_TREE, decl, named_labels);
|
||
|
||
return decl;
|
||
}
|
||
|
||
/* Make a label named NAME in the current function,
|
||
shadowing silently any that may be inherited from containing functions
|
||
or containing scopes.
|
||
|
||
Note that valid use, if the label being shadowed
|
||
comes from another scope in the same function,
|
||
requires calling declare_nonlocal_label right away. */
|
||
|
||
tree
|
||
shadow_label (name)
|
||
tree name;
|
||
{
|
||
tree decl = IDENTIFIER_LABEL_VALUE (name);
|
||
|
||
if (decl != 0)
|
||
{
|
||
tree dup;
|
||
|
||
/* Check to make sure that the label hasn't already been declared
|
||
at this label scope */
|
||
for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
|
||
if (TREE_VALUE (dup) == decl)
|
||
{
|
||
error ("duplicate label declaration `%s'",
|
||
IDENTIFIER_POINTER (name));
|
||
error_with_decl (TREE_VALUE (dup),
|
||
"this is a previous declaration");
|
||
/* Just use the previous declaration. */
|
||
return lookup_label (name);
|
||
}
|
||
|
||
shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
|
||
IDENTIFIER_LABEL_VALUE (name) = decl = 0;
|
||
}
|
||
|
||
return lookup_label (name);
|
||
}
|
||
|
||
/* Define a label, specifying the location in the source file.
|
||
Return the LABEL_DECL node for the label, if the definition is valid.
|
||
Otherwise return 0. */
|
||
|
||
tree
|
||
define_label (filename, line, name)
|
||
const char *filename;
|
||
int line;
|
||
tree name;
|
||
{
|
||
tree decl = lookup_label (name);
|
||
|
||
/* If label with this name is known from an outer context, shadow it. */
|
||
if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
|
||
{
|
||
shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
|
||
IDENTIFIER_LABEL_VALUE (name) = 0;
|
||
decl = lookup_label (name);
|
||
}
|
||
|
||
if (warn_traditional && !in_system_header && lookup_name (name))
|
||
warning_with_file_and_line (filename, line,
|
||
"traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
|
||
IDENTIFIER_POINTER (name));
|
||
|
||
if (DECL_INITIAL (decl) != 0)
|
||
{
|
||
error_with_file_and_line (filename, line, "duplicate label `%s'",
|
||
IDENTIFIER_POINTER (name));
|
||
return 0;
|
||
}
|
||
else
|
||
{
|
||
/* Mark label as having been defined. */
|
||
DECL_INITIAL (decl) = error_mark_node;
|
||
/* Say where in the source. */
|
||
DECL_SOURCE_FILE (decl) = filename;
|
||
DECL_SOURCE_LINE (decl) = line;
|
||
return decl;
|
||
}
|
||
}
|
||
|
||
/* Return the list of declarations of the current level.
|
||
Note that this list is in reverse order unless/until
|
||
you nreverse it; and when you do nreverse it, you must
|
||
store the result back using `storedecls' or you will lose. */
|
||
|
||
tree
|
||
getdecls ()
|
||
{
|
||
return current_binding_level->names;
|
||
}
|
||
|
||
/* Return the list of type-tags (for structs, etc) of the current level. */
|
||
|
||
tree
|
||
gettags ()
|
||
{
|
||
return current_binding_level->tags;
|
||
}
|
||
|
||
/* Store the list of declarations of the current level.
|
||
This is done for the parameter declarations of a function being defined,
|
||
after they are modified in the light of any missing parameters. */
|
||
|
||
static void
|
||
storedecls (decls)
|
||
tree decls;
|
||
{
|
||
current_binding_level->names = decls;
|
||
}
|
||
|
||
/* Similarly, store the list of tags of the current level. */
|
||
|
||
static void
|
||
storetags (tags)
|
||
tree tags;
|
||
{
|
||
current_binding_level->tags = tags;
|
||
}
|
||
|
||
/* Given NAME, an IDENTIFIER_NODE,
|
||
return the structure (or union or enum) definition for that name.
|
||
Searches binding levels from BINDING_LEVEL up to the global level.
|
||
If THISLEVEL_ONLY is nonzero, searches only the specified context
|
||
(but skips any tag-transparent contexts to find one that is
|
||
meaningful for tags).
|
||
CODE says which kind of type the caller wants;
|
||
it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
|
||
If the wrong kind of type is found, an error is reported. */
|
||
|
||
static tree
|
||
lookup_tag (code, name, binding_level, thislevel_only)
|
||
enum tree_code code;
|
||
struct binding_level *binding_level;
|
||
tree name;
|
||
int thislevel_only;
|
||
{
|
||
struct binding_level *level;
|
||
int thislevel = 1;
|
||
|
||
for (level = binding_level; level; level = level->level_chain)
|
||
{
|
||
tree tail;
|
||
for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
|
||
{
|
||
if (TREE_PURPOSE (tail) == name)
|
||
{
|
||
if (TREE_CODE (TREE_VALUE (tail)) != code)
|
||
{
|
||
/* Definition isn't the kind we were looking for. */
|
||
pending_invalid_xref = name;
|
||
pending_invalid_xref_file = input_filename;
|
||
pending_invalid_xref_line = lineno;
|
||
/* If in the same binding level as a declaration as a tag
|
||
of a different type, this must not be allowed to
|
||
shadow that tag, so give the error immediately.
|
||
(For example, "struct foo; union foo;" is invalid.) */
|
||
if (thislevel)
|
||
pending_xref_error ();
|
||
}
|
||
return TREE_VALUE (tail);
|
||
}
|
||
}
|
||
if (! level->tag_transparent)
|
||
{
|
||
if (thislevel_only)
|
||
return NULL_TREE;
|
||
thislevel = 0;
|
||
}
|
||
}
|
||
return NULL_TREE;
|
||
}
|
||
|
||
/* Print an error message now
|
||
for a recent invalid struct, union or enum cross reference.
|
||
We don't print them immediately because they are not invalid
|
||
when used in the `struct foo;' construct for shadowing. */
|
||
|
||
void
|
||
pending_xref_error ()
|
||
{
|
||
if (pending_invalid_xref != 0)
|
||
error_with_file_and_line (pending_invalid_xref_file,
|
||
pending_invalid_xref_line,
|
||
"`%s' defined as wrong kind of tag",
|
||
IDENTIFIER_POINTER (pending_invalid_xref));
|
||
pending_invalid_xref = 0;
|
||
}
|
||
|
||
/* Given a type, find the tag that was defined for it and return the tag name.
|
||
Otherwise return 0. */
|
||
|
||
static tree
|
||
lookup_tag_reverse (type)
|
||
tree type;
|
||
{
|
||
struct binding_level *level;
|
||
|
||
for (level = current_binding_level; level; level = level->level_chain)
|
||
{
|
||
tree tail;
|
||
for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
|
||
{
|
||
if (TREE_VALUE (tail) == type)
|
||
return TREE_PURPOSE (tail);
|
||
}
|
||
}
|
||
return NULL_TREE;
|
||
}
|
||
|
||
/* Look up NAME in the current binding level and its superiors
|
||
in the namespace of variables, functions and typedefs.
|
||
Return a ..._DECL node of some kind representing its definition,
|
||
or return 0 if it is undefined. */
|
||
|
||
tree
|
||
lookup_name (name)
|
||
tree name;
|
||
{
|
||
tree val;
|
||
|
||
if (current_binding_level != global_binding_level
|
||
&& IDENTIFIER_LOCAL_VALUE (name))
|
||
val = IDENTIFIER_LOCAL_VALUE (name);
|
||
else
|
||
val = IDENTIFIER_GLOBAL_VALUE (name);
|
||
return val;
|
||
}
|
||
|
||
/* Similar to `lookup_name' but look only at current binding level. */
|
||
|
||
tree
|
||
lookup_name_current_level (name)
|
||
tree name;
|
||
{
|
||
tree t;
|
||
|
||
if (current_binding_level == global_binding_level)
|
||
return IDENTIFIER_GLOBAL_VALUE (name);
|
||
|
||
if (IDENTIFIER_LOCAL_VALUE (name) == 0)
|
||
return 0;
|
||
|
||
for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
|
||
if (DECL_NAME (t) == name)
|
||
break;
|
||
|
||
return t;
|
||
}
|
||
|
||
/* Create the predefined scalar types of C,
|
||
and some nodes representing standard constants (0, 1, (void *) 0).
|
||
Initialize the global binding level.
|
||
Make definitions for built-in primitive functions. */
|
||
|
||
void
|
||
c_init_decl_processing ()
|
||
{
|
||
tree endlink;
|
||
tree ptr_ftype_void, ptr_ftype_ptr;
|
||
|
||
/* Adds some ggc roots, and reserved words for c-parse.in. */
|
||
c_parse_init ();
|
||
|
||
current_function_decl = NULL;
|
||
named_labels = NULL;
|
||
current_binding_level = NULL_BINDING_LEVEL;
|
||
free_binding_level = NULL_BINDING_LEVEL;
|
||
|
||
/* Make the binding_level structure for global names. */
|
||
pushlevel (0);
|
||
global_binding_level = current_binding_level;
|
||
|
||
build_common_tree_nodes (flag_signed_char);
|
||
|
||
c_common_nodes_and_builtins ();
|
||
|
||
boolean_type_node = integer_type_node;
|
||
boolean_true_node = integer_one_node;
|
||
boolean_false_node = integer_zero_node;
|
||
|
||
c_bool_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
|
||
TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
|
||
TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
|
||
TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
|
||
TYPE_PRECISION (c_bool_type_node) = 1;
|
||
pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
|
||
c_bool_type_node));
|
||
c_bool_false_node = build_int_2 (0, 0);
|
||
TREE_TYPE (c_bool_false_node) = c_bool_type_node;
|
||
c_bool_true_node = build_int_2 (1, 0);
|
||
TREE_TYPE (c_bool_true_node) = c_bool_type_node;
|
||
|
||
endlink = void_list_node;
|
||
ptr_ftype_void = build_function_type (ptr_type_node, endlink);
|
||
ptr_ftype_ptr
|
||
= build_function_type (ptr_type_node,
|
||
tree_cons (NULL_TREE, ptr_type_node, endlink));
|
||
|
||
pedantic_lvalues = pedantic;
|
||
|
||
make_fname_decl = c_make_fname_decl;
|
||
start_fname_decls ();
|
||
}
|
||
|
||
/* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
|
||
decl, NAME is the initialization string and TYPE_DEP indicates whether
|
||
NAME depended on the type of the function. As we don't yet implement
|
||
delayed emission of static data, we mark the decl as emitted
|
||
so it is not placed in the output. Anything using it must therefore pull
|
||
out the STRING_CST initializer directly. This does mean that these names
|
||
are string merging candidates, which is wrong for C99's __func__. FIXME. */
|
||
|
||
static tree
|
||
c_make_fname_decl (id, type_dep)
|
||
tree id;
|
||
int type_dep;
|
||
{
|
||
const char *name = fname_as_string (type_dep);
|
||
tree decl, type, init;
|
||
size_t length = strlen (name);
|
||
|
||
type = build_array_type
|
||
(build_qualified_type (char_type_node, TYPE_QUAL_CONST),
|
||
build_index_type (size_int (length)));
|
||
|
||
decl = build_decl (VAR_DECL, id, type);
|
||
/* We don't push the decl, so have to set its context here. */
|
||
DECL_CONTEXT (decl) = current_function_decl;
|
||
|
||
TREE_STATIC (decl) = 1;
|
||
TREE_READONLY (decl) = 1;
|
||
DECL_ARTIFICIAL (decl) = 1;
|
||
|
||
init = build_string (length + 1, name);
|
||
TREE_TYPE (init) = type;
|
||
DECL_INITIAL (decl) = init;
|
||
|
||
TREE_USED (decl) = 1;
|
||
|
||
finish_decl (decl, init, NULL_TREE);
|
||
|
||
return decl;
|
||
}
|
||
|
||
/* Return a definition for a builtin function named NAME and whose data type
|
||
is TYPE. TYPE should be a function type with argument types.
|
||
FUNCTION_CODE tells later passes how to compile calls to this function.
|
||
See tree.h for its possible values.
|
||
|
||
If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
|
||
the name to be called if we can't opencode the function. If
|
||
ATTRS is nonzero, use that for the function's attribute list. */
|
||
|
||
tree
|
||
builtin_function (name, type, function_code, class, library_name, attrs)
|
||
const char *name;
|
||
tree type;
|
||
int function_code;
|
||
enum built_in_class class;
|
||
const char *library_name;
|
||
tree attrs;
|
||
{
|
||
tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
|
||
DECL_EXTERNAL (decl) = 1;
|
||
TREE_PUBLIC (decl) = 1;
|
||
if (library_name)
|
||
SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
|
||
make_decl_rtl (decl, NULL);
|
||
pushdecl (decl);
|
||
DECL_BUILT_IN_CLASS (decl) = class;
|
||
DECL_FUNCTION_CODE (decl) = function_code;
|
||
|
||
/* Warn if a function in the namespace for users
|
||
is used without an occasion to consider it declared. */
|
||
if (name[0] != '_' || name[1] != '_')
|
||
C_DECL_ANTICIPATED (decl) = 1;
|
||
|
||
/* Possibly apply some default attributes to this built-in function. */
|
||
if (attrs)
|
||
decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
|
||
else
|
||
decl_attributes (&decl, NULL_TREE, 0);
|
||
|
||
return decl;
|
||
}
|
||
|
||
/* Apply default attributes to a function, if a system function with default
|
||
attributes. */
|
||
|
||
void
|
||
c_insert_default_attributes (decl)
|
||
tree decl;
|
||
{
|
||
if (!TREE_PUBLIC (decl))
|
||
return;
|
||
c_common_insert_default_attributes (decl);
|
||
}
|
||
|
||
/* Called when a declaration is seen that contains no names to declare.
|
||
If its type is a reference to a structure, union or enum inherited
|
||
from a containing scope, shadow that tag name for the current scope
|
||
with a forward reference.
|
||
If its type defines a new named structure or union
|
||
or defines an enum, it is valid but we need not do anything here.
|
||
Otherwise, it is an error. */
|
||
|
||
void
|
||
shadow_tag (declspecs)
|
||
tree declspecs;
|
||
{
|
||
shadow_tag_warned (declspecs, 0);
|
||
}
|
||
|
||
void
|
||
shadow_tag_warned (declspecs, warned)
|
||
tree declspecs;
|
||
int warned;
|
||
/* 1 => we have done a pedwarn. 2 => we have done a warning, but
|
||
no pedwarn. */
|
||
{
|
||
int found_tag = 0;
|
||
tree link;
|
||
tree specs, attrs;
|
||
|
||
pending_invalid_xref = 0;
|
||
|
||
/* Remove the attributes from declspecs, since they will confuse the
|
||
following code. */
|
||
split_specs_attrs (declspecs, &specs, &attrs);
|
||
|
||
for (link = specs; link; link = TREE_CHAIN (link))
|
||
{
|
||
tree value = TREE_VALUE (link);
|
||
enum tree_code code = TREE_CODE (value);
|
||
|
||
if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
|
||
/* Used to test also that TYPE_SIZE (value) != 0.
|
||
That caused warning for `struct foo;' at top level in the file. */
|
||
{
|
||
tree name = lookup_tag_reverse (value);
|
||
tree t;
|
||
|
||
found_tag++;
|
||
|
||
if (name == 0)
|
||
{
|
||
if (warned != 1 && code != ENUMERAL_TYPE)
|
||
/* Empty unnamed enum OK */
|
||
{
|
||
pedwarn ("unnamed struct/union that defines no instances");
|
||
warned = 1;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
t = lookup_tag (code, name, current_binding_level, 1);
|
||
|
||
if (t == 0)
|
||
{
|
||
t = make_node (code);
|
||
pushtag (name, t);
|
||
}
|
||
}
|
||
}
|
||
else
|
||
{
|
||
if (!warned && ! in_system_header)
|
||
{
|
||
warning ("useless keyword or type name in empty declaration");
|
||
warned = 2;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (found_tag > 1)
|
||
error ("two types specified in one empty declaration");
|
||
|
||
if (warned != 1)
|
||
{
|
||
if (found_tag == 0)
|
||
pedwarn ("empty declaration");
|
||
}
|
||
}
|
||
|
||
/* Construct an array declarator. EXPR is the expression inside [], or
|
||
NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
|
||
to the pointer to which a parameter array is converted). STATIC_P is
|
||
nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
|
||
is nonzero is the array is [*], a VLA of unspecified length which is
|
||
nevertheless a complete type (not currently implemented by GCC),
|
||
zero otherwise. The declarator is constructed as an ARRAY_REF
|
||
(to be decoded by grokdeclarator), whose operand 0 is what's on the
|
||
left of the [] (filled by in set_array_declarator_type) and operand 1
|
||
is the expression inside; whose TREE_TYPE is the type qualifiers and
|
||
which has TREE_STATIC set if "static" is used. */
|
||
|
||
tree
|
||
build_array_declarator (expr, quals, static_p, vla_unspec_p)
|
||
tree expr;
|
||
tree quals;
|
||
int static_p;
|
||
int vla_unspec_p;
|
||
{
|
||
tree decl;
|
||
decl = build_nt (ARRAY_REF, NULL_TREE, expr);
|
||
TREE_TYPE (decl) = quals;
|
||
TREE_STATIC (decl) = (static_p ? 1 : 0);
|
||
if (pedantic && !flag_isoc99)
|
||
{
|
||
if (static_p || quals != NULL_TREE)
|
||
pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
|
||
if (vla_unspec_p)
|
||
pedwarn ("ISO C90 does not support `[*]' array declarators");
|
||
}
|
||
if (vla_unspec_p)
|
||
warning ("GCC does not yet properly implement `[*]' array declarators");
|
||
return decl;
|
||
}
|
||
|
||
/* Set the type of an array declarator. DECL is the declarator, as
|
||
constructed by build_array_declarator; TYPE is what appears on the left
|
||
of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
|
||
abstract declarator, zero otherwise; this is used to reject static and
|
||
type qualifiers in abstract declarators, where they are not in the
|
||
C99 grammar. */
|
||
|
||
tree
|
||
set_array_declarator_type (decl, type, abstract_p)
|
||
tree decl;
|
||
tree type;
|
||
int abstract_p;
|
||
{
|
||
TREE_OPERAND (decl, 0) = type;
|
||
if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
|
||
error ("static or type qualifiers in abstract declarator");
|
||
return decl;
|
||
}
|
||
|
||
/* Decode a "typename", such as "int **", returning a ..._TYPE node. */
|
||
|
||
tree
|
||
groktypename (typename)
|
||
tree typename;
|
||
{
|
||
tree specs, attrs;
|
||
|
||
if (TREE_CODE (typename) != TREE_LIST)
|
||
return typename;
|
||
|
||
split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
|
||
|
||
typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
|
||
|
||
/* Apply attributes. */
|
||
decl_attributes (&typename, attrs, 0);
|
||
|
||
return typename;
|
||
}
|
||
|
||
/* Return a PARM_DECL node for a given pair of specs and declarator. */
|
||
|
||
tree
|
||
groktypename_in_parm_context (typename)
|
||
tree typename;
|
||
{
|
||
if (TREE_CODE (typename) != TREE_LIST)
|
||
return typename;
|
||
return grokdeclarator (TREE_VALUE (typename),
|
||
TREE_PURPOSE (typename),
|
||
PARM, 0);
|
||
}
|
||
|
||
/* Decode a declarator in an ordinary declaration or data definition.
|
||
This is called as soon as the type information and variable name
|
||
have been parsed, before parsing the initializer if any.
|
||
Here we create the ..._DECL node, fill in its type,
|
||
and put it on the list of decls for the current context.
|
||
The ..._DECL node is returned as the value.
|
||
|
||
Exception: for arrays where the length is not specified,
|
||
the type is left null, to be filled in by `finish_decl'.
|
||
|
||
Function definitions do not come here; they go to start_function
|
||
instead. However, external and forward declarations of functions
|
||
do go through here. Structure field declarations are done by
|
||
grokfield and not through here. */
|
||
|
||
tree
|
||
start_decl (declarator, declspecs, initialized, attributes)
|
||
tree declarator, declspecs;
|
||
int initialized;
|
||
tree attributes;
|
||
{
|
||
tree decl;
|
||
tree tem;
|
||
|
||
/* An object declared as __attribute__((deprecated)) suppresses
|
||
warnings of uses of other deprecated items. */
|
||
if (lookup_attribute ("deprecated", attributes))
|
||
deprecated_state = DEPRECATED_SUPPRESS;
|
||
|
||
decl = grokdeclarator (declarator, declspecs,
|
||
NORMAL, initialized);
|
||
|
||
deprecated_state = DEPRECATED_NORMAL;
|
||
|
||
if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
|
||
&& MAIN_NAME_P (DECL_NAME (decl)))
|
||
warning_with_decl (decl, "`%s' is usually a function");
|
||
|
||
if (initialized)
|
||
/* Is it valid for this decl to have an initializer at all?
|
||
If not, set INITIALIZED to zero, which will indirectly
|
||
tell `finish_decl' to ignore the initializer once it is parsed. */
|
||
switch (TREE_CODE (decl))
|
||
{
|
||
case TYPE_DECL:
|
||
error ("typedef `%s' is initialized (use __typeof__ instead)",
|
||
IDENTIFIER_POINTER (DECL_NAME (decl)));
|
||
initialized = 0;
|
||
break;
|
||
|
||
case FUNCTION_DECL:
|
||
error ("function `%s' is initialized like a variable",
|
||
IDENTIFIER_POINTER (DECL_NAME (decl)));
|
||
initialized = 0;
|
||
break;
|
||
|
||
case PARM_DECL:
|
||
/* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
|
||
error ("parameter `%s' is initialized",
|
||
IDENTIFIER_POINTER (DECL_NAME (decl)));
|
||
initialized = 0;
|
||
break;
|
||
|
||
default:
|
||
/* Don't allow initializations for incomplete types
|
||
except for arrays which might be completed by the initialization. */
|
||
|
||
/* This can happen if the array size is an undefined macro. We already
|
||
gave a warning, so we don't need another one. */
|
||
if (TREE_TYPE (decl) == error_mark_node)
|
||
initialized = 0;
|
||
else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
|
||
{
|
||
/* A complete type is ok if size is fixed. */
|
||
|
||
if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
|
||
|| C_DECL_VARIABLE_SIZE (decl))
|
||
{
|
||
error ("variable-sized object may not be initialized");
|
||
initialized = 0;
|
||
}
|
||
}
|
||
else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
|
||
{
|
||
error ("variable `%s' has initializer but incomplete type",
|
||
IDENTIFIER_POINTER (DECL_NAME (decl)));
|
||
initialized = 0;
|
||
}
|
||
else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
|
||
{
|
||
error ("elements of array `%s' have incomplete type",
|
||
IDENTIFIER_POINTER (DECL_NAME (decl)));
|
||
initialized = 0;
|
||
}
|
||
}
|
||
|
||
if (initialized)
|
||
{
|
||
#if 0
|
||
/* Seems redundant with grokdeclarator. */
|
||
if (current_binding_level != global_binding_level
|
||
&& DECL_EXTERNAL (decl)
|
||
&& TREE_CODE (decl) != FUNCTION_DECL)
|
||
warning ("declaration of `%s' has `extern' and is initialized",
|
||
IDENTIFIER_POINTER (DECL_NAME (decl)));
|
||
#endif
|
||
DECL_EXTERNAL (decl) = 0;
|
||
if (current_binding_level == global_binding_level)
|
||
TREE_STATIC (decl) = 1;
|
||
|
||
/* Tell `pushdecl' this is an initialized decl
|
||
even though we don't yet have the initializer expression.
|
||
Also tell `finish_decl' it may store the real initializer. */
|
||
DECL_INITIAL (decl) = error_mark_node;
|
||
}
|
||
|
||
/* If this is a function declaration, write a record describing it to the
|
||
prototypes file (if requested). */
|
||
|
||
if (TREE_CODE (decl) == FUNCTION_DECL)
|
||
gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
|
||
|
||
/* ANSI specifies that a tentative definition which is not merged with
|
||
a non-tentative definition behaves exactly like a definition with an
|
||
initializer equal to zero. (Section 3.7.2)
|
||
|
||
-fno-common gives strict ANSI behavior, though this tends to break
|
||
a large body of code that grew up without this rule.
|
||
|
||
Thread-local variables are never common, since there's no entrenched
|
||
body of code to break, and it allows more efficient variable references
|
||
in the presense of dynamic linking. */
|
||
|
||
if (TREE_CODE (decl) == VAR_DECL
|
||
&& !initialized
|
||
&& TREE_PUBLIC (decl)
|
||
&& !DECL_THREAD_LOCAL (decl)
|
||
&& !flag_no_common)
|
||
DECL_COMMON (decl) = 1;
|
||
|
||
/* Set attributes here so if duplicate decl, will have proper attributes. */
|
||
decl_attributes (&decl, attributes, 0);
|
||
|
||
/* If #pragma weak was used, mark the decl weak now. */
|
||
if (current_binding_level == global_binding_level)
|
||
maybe_apply_pragma_weak (decl);
|
||
|
||
if (TREE_CODE (decl) == FUNCTION_DECL
|
||
&& DECL_DECLARED_INLINE_P (decl)
|
||
&& DECL_UNINLINABLE (decl)
|
||
&& lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
|
||
warning_with_decl (decl,
|
||
"inline function `%s' given attribute noinline");
|
||
|
||
/* Add this decl to the current binding level.
|
||
TEM may equal DECL or it may be a previous decl of the same name. */
|
||
tem = pushdecl (decl);
|
||
|
||
/* For a local variable, define the RTL now. */
|
||
if (current_binding_level != global_binding_level
|
||
/* But not if this is a duplicate decl
|
||
and we preserved the rtl from the previous one
|
||
(which may or may not happen). */
|
||
&& !DECL_RTL_SET_P (tem)
|
||
&& !DECL_CONTEXT (tem))
|
||
{
|
||
if (TREE_TYPE (tem) != error_mark_node
|
||
&& COMPLETE_TYPE_P (TREE_TYPE (tem)))
|
||
expand_decl (tem);
|
||
else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
|
||
&& DECL_INITIAL (tem) != 0)
|
||
expand_decl (tem);
|
||
}
|
||
|
||
return tem;
|
||
}
|
||
|
||
/* Finish processing of a declaration;
|
||
install its initial value.
|
||
If the length of an array type is not known before,
|
||
it must be determined now, from the initial value, or it is an error. */
|
||
|
||
void
|
||
finish_decl (decl, init, asmspec_tree)
|
||
tree decl, init;
|
||
tree asmspec_tree;
|
||
{
|
||
tree type = TREE_TYPE (decl);
|
||
int was_incomplete = (DECL_SIZE (decl) == 0);
|
||
const char *asmspec = 0;
|
||
|
||
/* If a name was specified, get the string. */
|
||
if (current_binding_level == global_binding_level)
|
||
asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
|
||
if (asmspec_tree)
|
||
asmspec = TREE_STRING_POINTER (asmspec_tree);
|
||
|
||
/* If `start_decl' didn't like having an initialization, ignore it now. */
|
||
if (init != 0 && DECL_INITIAL (decl) == 0)
|
||
init = 0;
|
||
|
||
/* Don't crash if parm is initialized. */
|
||
if (TREE_CODE (decl) == PARM_DECL)
|
||
init = 0;
|
||
|
||
if (init)
|
||
store_init_value (decl, init);
|
||
|
||
/* Deduce size of array from initialization, if not already known */
|
||
if (TREE_CODE (type) == ARRAY_TYPE
|
||
&& TYPE_DOMAIN (type) == 0
|
||
&& TREE_CODE (decl) != TYPE_DECL)
|
||
{
|
||
int do_default
|
||
= (TREE_STATIC (decl)
|
||
/* Even if pedantic, an external linkage array
|
||
may have incomplete type at first. */
|
||
? pedantic && !TREE_PUBLIC (decl)
|
||
: !DECL_EXTERNAL (decl));
|
||
int failure
|
||
= complete_array_type (type, DECL_INITIAL (decl), do_default);
|
||
|
||
/* Get the completed type made by complete_array_type. */
|
||
type = TREE_TYPE (decl);
|
||
|
||
if (failure == 1)
|
||
error_with_decl (decl, "initializer fails to determine size of `%s'");
|
||
|
||
else if (failure == 2)
|
||
{
|
||
if (do_default)
|
||
error_with_decl (decl, "array size missing in `%s'");
|
||
/* If a `static' var's size isn't known,
|
||
make it extern as well as static, so it does not get
|
||
allocated.
|
||
If it is not `static', then do not mark extern;
|
||
finish_incomplete_decl will give it a default size
|
||
and it will get allocated. */
|
||
else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
|
||
DECL_EXTERNAL (decl) = 1;
|
||
}
|
||
|
||
/* TYPE_MAX_VALUE is always one less than the number of elements
|
||
in the array, because we start counting at zero. Therefore,
|
||
warn only if the value is less than zero. */
|
||
else if (pedantic && TYPE_DOMAIN (type) != 0
|
||
&& tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
|
||
error_with_decl (decl, "zero or negative size array `%s'");
|
||
|
||
layout_decl (decl, 0);
|
||
}
|
||
|
||
if (TREE_CODE (decl) == VAR_DECL)
|
||
{
|
||
if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
|
||
&& COMPLETE_TYPE_P (TREE_TYPE (decl)))
|
||
layout_decl (decl, 0);
|
||
|
||
if (DECL_SIZE (decl) == 0
|
||
/* Don't give an error if we already gave one earlier. */
|
||
&& TREE_TYPE (decl) != error_mark_node
|
||
&& (TREE_STATIC (decl)
|
||
?
|
||
/* A static variable with an incomplete type
|
||
is an error if it is initialized.
|
||
Also if it is not file scope.
|
||
Otherwise, let it through, but if it is not `extern'
|
||
then it may cause an error message later. */
|
||
(DECL_INITIAL (decl) != 0
|
||
|| DECL_CONTEXT (decl) != 0)
|
||
:
|
||
/* An automatic variable with an incomplete type
|
||
is an error. */
|
||
!DECL_EXTERNAL (decl)))
|
||
{
|
||
error_with_decl (decl, "storage size of `%s' isn't known");
|
||
TREE_TYPE (decl) = error_mark_node;
|
||
}
|
||
|
||
if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
|
||
&& DECL_SIZE (decl) != 0)
|
||
{
|
||
if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
|
||
constant_expression_warning (DECL_SIZE (decl));
|
||
else
|
||
error_with_decl (decl, "storage size of `%s' isn't constant");
|
||
}
|
||
|
||
if (TREE_USED (type))
|
||
TREE_USED (decl) = 1;
|
||
}
|
||
|
||
/* If this is a function and an assembler name is specified, it isn't
|
||
builtin any more. Also reset DECL_RTL so we can give it its new
|
||
name. */
|
||
if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
|
||
{
|
||
DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
|
||
SET_DECL_RTL (decl, NULL_RTX);
|
||
SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
|
||
}
|
||
|
||
/* Output the assembler code and/or RTL code for variables and functions,
|
||
unless the type is an undefined structure or union.
|
||
If not, it will get done when the type is completed. */
|
||
|
||
if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
|
||
{
|
||
/* This is a no-op in c-lang.c or something real in objc-act.c. */
|
||
if (flag_objc)
|
||
objc_check_decl (decl);
|
||
|
||
if (!DECL_CONTEXT (decl))
|
||
{
|
||
if (DECL_INITIAL (decl) == NULL_TREE
|
||
|| DECL_INITIAL (decl) == error_mark_node)
|
||
/* Don't output anything
|
||
when a tentative file-scope definition is seen.
|
||
But at end of compilation, do output code for them. */
|
||
DECL_DEFER_OUTPUT (decl) = 1;
|
||
rest_of_decl_compilation (decl, asmspec,
|
||
(DECL_CONTEXT (decl) == 0
|
||
|| TREE_ASM_WRITTEN (decl)), 0);
|
||
}
|
||
else
|
||
{
|
||
/* This is a local variable. If there is an ASMSPEC, the
|
||
user has requested that we handle it specially. */
|
||
if (asmspec)
|
||
{
|
||
/* In conjunction with an ASMSPEC, the `register'
|
||
keyword indicates that we should place the variable
|
||
in a particular register. */
|
||
if (DECL_REGISTER (decl))
|
||
DECL_C_HARD_REGISTER (decl) = 1;
|
||
|
||
/* If this is not a static variable, issue a warning.
|
||
It doesn't make any sense to give an ASMSPEC for an
|
||
ordinary, non-register local variable. Historically,
|
||
GCC has accepted -- but ignored -- the ASMSPEC in
|
||
this case. */
|
||
if (TREE_CODE (decl) == VAR_DECL
|
||
&& !DECL_REGISTER (decl)
|
||
&& !TREE_STATIC (decl))
|
||
warning_with_decl (decl,
|
||
"ignoring asm-specifier for non-static local variable `%s'");
|
||
else
|
||
SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
|
||
}
|
||
|
||
if (TREE_CODE (decl) != FUNCTION_DECL)
|
||
add_decl_stmt (decl);
|
||
}
|
||
|
||
if (DECL_CONTEXT (decl) != 0)
|
||
{
|
||
/* Recompute the RTL of a local array now
|
||
if it used to be an incomplete type. */
|
||
if (was_incomplete
|
||
&& ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
|
||
{
|
||
/* If we used it already as memory, it must stay in memory. */
|
||
TREE_ADDRESSABLE (decl) = TREE_USED (decl);
|
||
/* If it's still incomplete now, no init will save it. */
|
||
if (DECL_SIZE (decl) == 0)
|
||
DECL_INITIAL (decl) = 0;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (TREE_CODE (decl) == TYPE_DECL)
|
||
{
|
||
/* This is a no-op in c-lang.c or something real in objc-act.c. */
|
||
if (flag_objc)
|
||
objc_check_decl (decl);
|
||
rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
|
||
}
|
||
|
||
/* At the end of a declaration, throw away any variable type sizes
|
||
of types defined inside that declaration. There is no use
|
||
computing them in the following function definition. */
|
||
if (current_binding_level == global_binding_level)
|
||
get_pending_sizes ();
|
||
|
||
/* Install a cleanup (aka destructor) if one was given. */
|
||
if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
|
||
{
|
||
tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
|
||
if (attr)
|
||
{
|
||
static bool eh_initialized_p;
|
||
|
||
tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
|
||
tree cleanup_decl = lookup_name (cleanup_id);
|
||
tree cleanup;
|
||
|
||
/* Build "cleanup(&decl)" for the destructor. */
|
||
cleanup = build_unary_op (ADDR_EXPR, decl, 0);
|
||
cleanup = build_tree_list (NULL_TREE, cleanup);
|
||
cleanup = build_function_call (cleanup_decl, cleanup);
|
||
|
||
/* Don't warn about decl unused; the cleanup uses it. */
|
||
TREE_USED (decl) = 1;
|
||
|
||
/* Initialize EH, if we've been told to do so. */
|
||
if (flag_exceptions && !eh_initialized_p)
|
||
{
|
||
eh_initialized_p = true;
|
||
eh_personality_libfunc
|
||
= init_one_libfunc (USING_SJLJ_EXCEPTIONS
|
||
? "__gcc_personality_sj0"
|
||
: "__gcc_personality_v0");
|
||
using_eh_for_cleanups ();
|
||
}
|
||
|
||
add_stmt (build_stmt (CLEANUP_STMT, decl, cleanup));
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Given a parsed parameter declaration,
|
||
decode it into a PARM_DECL and push that on the current binding level.
|
||
Also, for the sake of forward parm decls,
|
||
record the given order of parms in `parm_order'. */
|
||
|
||
void
|
||
push_parm_decl (parm)
|
||
tree parm;
|
||
{
|
||
tree decl;
|
||
int old_immediate_size_expand = immediate_size_expand;
|
||
/* Don't try computing parm sizes now -- wait till fn is called. */
|
||
immediate_size_expand = 0;
|
||
|
||
decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
|
||
TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
|
||
decl_attributes (&decl, TREE_VALUE (parm), 0);
|
||
|
||
#if 0
|
||
if (DECL_NAME (decl))
|
||
{
|
||
tree olddecl;
|
||
olddecl = lookup_name (DECL_NAME (decl));
|
||
if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
|
||
pedwarn_with_decl (decl,
|
||
"ISO C forbids parameter `%s' shadowing typedef");
|
||
}
|
||
#endif
|
||
|
||
decl = pushdecl (decl);
|
||
|
||
immediate_size_expand = old_immediate_size_expand;
|
||
|
||
current_binding_level->parm_order
|
||
= tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
|
||
|
||
/* Add this decl to the current binding level. */
|
||
finish_decl (decl, NULL_TREE, NULL_TREE);
|
||
}
|
||
|
||
/* Clear the given order of parms in `parm_order'.
|
||
Used at start of parm list,
|
||
and also at semicolon terminating forward decls. */
|
||
|
||
void
|
||
clear_parm_order ()
|
||
{
|
||
current_binding_level->parm_order = NULL_TREE;
|
||
}
|
||
|
||
/* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
|
||
literal, which may be an incomplete array type completed by the
|
||
initializer; INIT is a CONSTRUCTOR that initializes the compound
|
||
literal. */
|
||
|
||
tree
|
||
build_compound_literal (type, init)
|
||
tree type;
|
||
tree init;
|
||
{
|
||
/* We do not use start_decl here because we have a type, not a declarator;
|
||
and do not use finish_decl because the decl should be stored inside
|
||
the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
|
||
tree decl = build_decl (VAR_DECL, NULL_TREE, type);
|
||
tree complit;
|
||
tree stmt;
|
||
DECL_EXTERNAL (decl) = 0;
|
||
TREE_PUBLIC (decl) = 0;
|
||
TREE_STATIC (decl) = (current_binding_level == global_binding_level);
|
||
DECL_CONTEXT (decl) = current_function_decl;
|
||
TREE_USED (decl) = 1;
|
||
TREE_TYPE (decl) = type;
|
||
TREE_READONLY (decl) = TREE_READONLY (type);
|
||
store_init_value (decl, init);
|
||
|
||
if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
|
||
{
|
||
int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
|
||
if (failure)
|
||
abort ();
|
||
}
|
||
|
||
type = TREE_TYPE (decl);
|
||
if (type == error_mark_node || !COMPLETE_TYPE_P (type))
|
||
return error_mark_node;
|
||
|
||
stmt = build_stmt (DECL_STMT, decl);
|
||
complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
|
||
TREE_SIDE_EFFECTS (complit) = 1;
|
||
|
||
layout_decl (decl, 0);
|
||
|
||
if (TREE_STATIC (decl))
|
||
{
|
||
/* This decl needs a name for the assembler output. We also need
|
||
a unique suffix to be added to the name. */
|
||
char *name;
|
||
extern int var_labelno;
|
||
|
||
ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal", var_labelno);
|
||
var_labelno++;
|
||
DECL_NAME (decl) = get_identifier (name);
|
||
DECL_DEFER_OUTPUT (decl) = 1;
|
||
DECL_COMDAT (decl) = 1;
|
||
DECL_ARTIFICIAL (decl) = 1;
|
||
pushdecl (decl);
|
||
rest_of_decl_compilation (decl, NULL, 1, 0);
|
||
}
|
||
|
||
return complit;
|
||
}
|
||
|
||
/* Make TYPE a complete type based on INITIAL_VALUE.
|
||
Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
|
||
2 if there was no information (in which case assume 1 if DO_DEFAULT). */
|
||
|
||
int
|
||
complete_array_type (type, initial_value, do_default)
|
||
tree type;
|
||
tree initial_value;
|
||
int do_default;
|
||
{
|
||
tree maxindex = NULL_TREE;
|
||
int value = 0;
|
||
|
||
if (initial_value)
|
||
{
|
||
/* Note MAXINDEX is really the maximum index,
|
||
one less than the size. */
|
||
if (TREE_CODE (initial_value) == STRING_CST)
|
||
{
|
||
int eltsize
|
||
= int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
|
||
maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
|
||
/ eltsize) - 1, 0);
|
||
}
|
||
else if (TREE_CODE (initial_value) == CONSTRUCTOR)
|
||
{
|
||
tree elts = CONSTRUCTOR_ELTS (initial_value);
|
||
maxindex = build_int_2 (-1, -1);
|
||
for (; elts; elts = TREE_CHAIN (elts))
|
||
{
|
||
if (TREE_PURPOSE (elts))
|
||
maxindex = TREE_PURPOSE (elts);
|
||
else
|
||
maxindex = fold (build (PLUS_EXPR, integer_type_node,
|
||
maxindex, integer_one_node));
|
||
}
|
||
maxindex = copy_node (maxindex);
|
||
}
|
||
else
|
||
{
|
||
/* Make an error message unless that happened already. */
|
||
if (initial_value != error_mark_node)
|
||
value = 1;
|
||
|
||
/* Prevent further error messages. */
|
||
maxindex = build_int_2 (0, 0);
|
||
}
|
||
}
|
||
|
||
if (!maxindex)
|
||
{
|
||
if (do_default)
|
||
maxindex = build_int_2 (0, 0);
|
||
value = 2;
|
||
}
|
||
|
||
if (maxindex)
|
||
{
|
||
TYPE_DOMAIN (type) = build_index_type (maxindex);
|
||
if (!TREE_TYPE (maxindex))
|
||
TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
|
||
}
|
||
|
||
/* Lay out the type now that we can get the real answer. */
|
||
|
||
layout_type (type);
|
||
|
||
return value;
|
||
}
|
||
|
||
/* Determine whether TYPE is a structure with a flexible array member,
|
||
or a union containing such a structure (possibly recursively). */
|
||
|
||
static bool
|
||
flexible_array_type_p (type)
|
||
tree type;
|
||
{
|
||
tree x;
|
||
switch (TREE_CODE (type))
|
||
{
|
||
case RECORD_TYPE:
|
||
x = TYPE_FIELDS (type);
|
||
if (x == NULL_TREE)
|
||
return false;
|
||
while (TREE_CHAIN (x) != NULL_TREE)
|
||
x = TREE_CHAIN (x);
|
||
if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
|
||
&& TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
|
||
&& TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
|
||
&& TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
|
||
return true;
|
||
return false;
|
||
case UNION_TYPE:
|
||
for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
|
||
{
|
||
if (flexible_array_type_p (TREE_TYPE (x)))
|
||
return true;
|
||
}
|
||
return false;
|
||
default:
|
||
return false;
|
||
}
|
||
}
|
||
|
||
/* Given declspecs and a declarator,
|
||
determine the name and type of the object declared
|
||
and construct a ..._DECL node for it.
|
||
(In one case we can return a ..._TYPE node instead.
|
||
For invalid input we sometimes return 0.)
|
||
|
||
DECLSPECS is a chain of tree_list nodes whose value fields
|
||
are the storage classes and type specifiers.
|
||
|
||
DECL_CONTEXT says which syntactic context this declaration is in:
|
||
NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
|
||
FUNCDEF for a function definition. Like NORMAL but a few different
|
||
error messages in each case. Return value may be zero meaning
|
||
this definition is too screwy to try to parse.
|
||
PARM for a parameter declaration (either within a function prototype
|
||
or before a function body). Make a PARM_DECL, or return void_type_node.
|
||
TYPENAME if for a typename (in a cast or sizeof).
|
||
Don't make a DECL node; just return the ..._TYPE node.
|
||
FIELD for a struct or union field; make a FIELD_DECL.
|
||
BITFIELD for a field with specified width.
|
||
INITIALIZED is 1 if the decl has an initializer.
|
||
|
||
In the TYPENAME case, DECLARATOR is really an absolute declarator.
|
||
It may also be so in the PARM case, for a prototype where the
|
||
argument type is specified but not the name.
|
||
|
||
This function is where the complicated C meanings of `static'
|
||
and `extern' are interpreted. */
|
||
|
||
static tree
|
||
grokdeclarator (declarator, declspecs, decl_context, initialized)
|
||
tree declspecs;
|
||
tree declarator;
|
||
enum decl_context decl_context;
|
||
int initialized;
|
||
{
|
||
int specbits = 0;
|
||
tree spec;
|
||
tree type = NULL_TREE;
|
||
int longlong = 0;
|
||
int constp;
|
||
int restrictp;
|
||
int volatilep;
|
||
int type_quals = TYPE_UNQUALIFIED;
|
||
int inlinep;
|
||
int explicit_int = 0;
|
||
int explicit_char = 0;
|
||
int defaulted_int = 0;
|
||
tree typedef_decl = 0;
|
||
const char *name;
|
||
tree typedef_type = 0;
|
||
int funcdef_flag = 0;
|
||
enum tree_code innermost_code = ERROR_MARK;
|
||
int bitfield = 0;
|
||
int size_varies = 0;
|
||
tree decl_attr = NULL_TREE;
|
||
tree array_ptr_quals = NULL_TREE;
|
||
int array_parm_static = 0;
|
||
tree returned_attrs = NULL_TREE;
|
||
|
||
if (decl_context == BITFIELD)
|
||
bitfield = 1, decl_context = FIELD;
|
||
|
||
if (decl_context == FUNCDEF)
|
||
funcdef_flag = 1, decl_context = NORMAL;
|
||
|
||
/* Look inside a declarator for the name being declared
|
||
and get it as a string, for an error message. */
|
||
{
|
||
tree decl = declarator;
|
||
name = 0;
|
||
|
||
while (decl)
|
||
switch (TREE_CODE (decl))
|
||
{
|
||
case ARRAY_REF:
|
||
case INDIRECT_REF:
|
||
case CALL_EXPR:
|
||
innermost_code = TREE_CODE (decl);
|
||
decl = TREE_OPERAND (decl, 0);
|
||
break;
|
||
|
||
case TREE_LIST:
|
||
decl = TREE_VALUE (decl);
|
||
break;
|
||
|
||
case IDENTIFIER_NODE:
|
||
name = IDENTIFIER_POINTER (decl);
|
||
decl = 0;
|
||
break;
|
||
|
||
default:
|
||
abort ();
|
||
}
|
||
if (name == 0)
|
||
name = "type name";
|
||
}
|
||
|
||
/* A function definition's declarator must have the form of
|
||
a function declarator. */
|
||
|
||
if (funcdef_flag && innermost_code != CALL_EXPR)
|
||
return 0;
|
||
|
||
/* Anything declared one level down from the top level
|
||
must be one of the parameters of a function
|
||
(because the body is at least two levels down). */
|
||
|
||
/* If this looks like a function definition, make it one,
|
||
even if it occurs where parms are expected.
|
||
Then store_parm_decls will reject it and not use it as a parm. */
|
||
if (decl_context == NORMAL && !funcdef_flag
|
||
&& current_binding_level->parm_flag)
|
||
decl_context = PARM;
|
||
|
||
/* Look through the decl specs and record which ones appear.
|
||
Some typespecs are defined as built-in typenames.
|
||
Others, the ones that are modifiers of other types,
|
||
are represented by bits in SPECBITS: set the bits for
|
||
the modifiers that appear. Storage class keywords are also in SPECBITS.
|
||
|
||
If there is a typedef name or a type, store the type in TYPE.
|
||
This includes builtin typedefs such as `int'.
|
||
|
||
Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
|
||
and did not come from a user typedef.
|
||
|
||
Set LONGLONG if `long' is mentioned twice. */
|
||
|
||
for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
|
||
{
|
||
tree id = TREE_VALUE (spec);
|
||
|
||
/* If the entire declaration is itself tagged as deprecated then
|
||
suppress reports of deprecated items. */
|
||
if (id && TREE_DEPRECATED (id))
|
||
{
|
||
if (deprecated_state != DEPRECATED_SUPPRESS)
|
||
warn_deprecated_use (id);
|
||
}
|
||
|
||
if (id == ridpointers[(int) RID_INT])
|
||
explicit_int = 1;
|
||
if (id == ridpointers[(int) RID_CHAR])
|
||
explicit_char = 1;
|
||
|
||
if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
|
||
{
|
||
enum rid i = C_RID_CODE (id);
|
||
if ((int) i <= (int) RID_LAST_MODIFIER)
|
||
{
|
||
if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
|
||
{
|
||
if (longlong)
|
||
error ("`long long long' is too long for GCC");
|
||
else
|
||
{
|
||
if (pedantic && !flag_isoc99 && ! in_system_header
|
||
&& warn_long_long)
|
||
pedwarn ("ISO C90 does not support `long long'");
|
||
longlong = 1;
|
||
}
|
||
}
|
||
else if (specbits & (1 << (int) i))
|
||
{
|
||
if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
|
||
{
|
||
if (!flag_isoc99)
|
||
pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
|
||
}
|
||
else
|
||
error ("duplicate `%s'", IDENTIFIER_POINTER (id));
|
||
}
|
||
|
||
/* Diagnose "__thread extern". Recall that this list
|
||
is in the reverse order seen in the text. */
|
||
if (i == RID_THREAD
|
||
&& (specbits & (1 << (int) RID_EXTERN
|
||
| 1 << (int) RID_STATIC)))
|
||
{
|
||
if (specbits & 1 << (int) RID_EXTERN)
|
||
error ("`__thread' before `extern'");
|
||
else
|
||
error ("`__thread' before `static'");
|
||
}
|
||
|
||
specbits |= 1 << (int) i;
|
||
goto found;
|
||
}
|
||
}
|
||
if (type)
|
||
error ("two or more data types in declaration of `%s'", name);
|
||
/* Actual typedefs come to us as TYPE_DECL nodes. */
|
||
else if (TREE_CODE (id) == TYPE_DECL)
|
||
{
|
||
if (TREE_TYPE (id) == error_mark_node)
|
||
; /* Allow the type to default to int to avoid cascading errors. */
|
||
else
|
||
{
|
||
type = TREE_TYPE (id);
|
||
decl_attr = DECL_ATTRIBUTES (id);
|
||
typedef_decl = id;
|
||
}
|
||
}
|
||
/* Built-in types come as identifiers. */
|
||
else if (TREE_CODE (id) == IDENTIFIER_NODE)
|
||
{
|
||
tree t = lookup_name (id);
|
||
if (TREE_TYPE (t) == error_mark_node)
|
||
;
|
||
else if (!t || TREE_CODE (t) != TYPE_DECL)
|
||
error ("`%s' fails to be a typedef or built in type",
|
||
IDENTIFIER_POINTER (id));
|
||
else
|
||
{
|
||
type = TREE_TYPE (t);
|
||
typedef_decl = t;
|
||
}
|
||
}
|
||
else if (TREE_CODE (id) != ERROR_MARK)
|
||
type = id;
|
||
|
||
found:
|
||
;
|
||
}
|
||
|
||
typedef_type = type;
|
||
if (type)
|
||
size_varies = C_TYPE_VARIABLE_SIZE (type);
|
||
|
||
/* No type at all: default to `int', and set DEFAULTED_INT
|
||
because it was not a user-defined typedef. */
|
||
|
||
if (type == 0)
|
||
{
|
||
if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
|
||
| (1 << (int) RID_SIGNED)
|
||
| (1 << (int) RID_UNSIGNED)
|
||
| (1 << (int) RID_COMPLEX))))
|
||
/* Don't warn about typedef foo = bar. */
|
||
&& ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
|
||
&& ! in_system_header)
|
||
{
|
||
/* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
|
||
and this is a function, or if -Wimplicit; prefer the former
|
||
warning since it is more explicit. */
|
||
if ((warn_implicit_int || warn_return_type || flag_isoc99)
|
||
&& funcdef_flag)
|
||
warn_about_return_type = 1;
|
||
else if (warn_implicit_int || flag_isoc99)
|
||
pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
|
||
name);
|
||
}
|
||
|
||
defaulted_int = 1;
|
||
type = integer_type_node;
|
||
}
|
||
|
||
/* Now process the modifiers that were specified
|
||
and check for invalid combinations. */
|
||
|
||
/* Long double is a special combination. */
|
||
|
||
if ((specbits & 1 << (int) RID_LONG) && ! longlong
|
||
&& TYPE_MAIN_VARIANT (type) == double_type_node)
|
||
{
|
||
specbits &= ~(1 << (int) RID_LONG);
|
||
type = long_double_type_node;
|
||
}
|
||
|
||
/* Check all other uses of type modifiers. */
|
||
|
||
if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
|
||
| (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
|
||
{
|
||
int ok = 0;
|
||
|
||
if ((specbits & 1 << (int) RID_LONG)
|
||
&& (specbits & 1 << (int) RID_SHORT))
|
||
error ("both long and short specified for `%s'", name);
|
||
else if (((specbits & 1 << (int) RID_LONG)
|
||
|| (specbits & 1 << (int) RID_SHORT))
|
||
&& explicit_char)
|
||
error ("long or short specified with char for `%s'", name);
|
||
else if (((specbits & 1 << (int) RID_LONG)
|
||
|| (specbits & 1 << (int) RID_SHORT))
|
||
&& TREE_CODE (type) == REAL_TYPE)
|
||
{
|
||
static int already = 0;
|
||
|
||
error ("long or short specified with floating type for `%s'", name);
|
||
if (! already && ! pedantic)
|
||
{
|
||
error ("the only valid combination is `long double'");
|
||
already = 1;
|
||
}
|
||
}
|
||
else if ((specbits & 1 << (int) RID_SIGNED)
|
||
&& (specbits & 1 << (int) RID_UNSIGNED))
|
||
error ("both signed and unsigned specified for `%s'", name);
|
||
else if (TREE_CODE (type) != INTEGER_TYPE)
|
||
error ("long, short, signed or unsigned invalid for `%s'", name);
|
||
else
|
||
{
|
||
ok = 1;
|
||
if (!explicit_int && !defaulted_int && !explicit_char)
|
||
{
|
||
error ("long, short, signed or unsigned used invalidly for `%s'",
|
||
name);
|
||
ok = 0;
|
||
}
|
||
}
|
||
|
||
/* Discard the type modifiers if they are invalid. */
|
||
if (! ok)
|
||
{
|
||
specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
|
||
| (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
|
||
longlong = 0;
|
||
}
|
||
}
|
||
|
||
if ((specbits & (1 << (int) RID_COMPLEX))
|
||
&& TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
|
||
{
|
||
error ("complex invalid for `%s'", name);
|
||
specbits &= ~(1 << (int) RID_COMPLEX);
|
||
}
|
||
|
||
/* Decide whether an integer type is signed or not.
|
||
Optionally treat bitfields as signed by default. */
|
||
if (specbits & 1 << (int) RID_UNSIGNED
|
||
|| (bitfield && ! flag_signed_bitfields
|
||
&& (explicit_int || defaulted_int || explicit_char
|
||
/* A typedef for plain `int' without `signed'
|
||
can be controlled just like plain `int'. */
|
||
|| ! (typedef_decl != 0
|
||
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
|
||
&& TREE_CODE (type) != ENUMERAL_TYPE
|
||
&& !(specbits & 1 << (int) RID_SIGNED)))
|
||
{
|
||
if (longlong)
|
||
type = long_long_unsigned_type_node;
|
||
else if (specbits & 1 << (int) RID_LONG)
|
||
type = long_unsigned_type_node;
|
||
else if (specbits & 1 << (int) RID_SHORT)
|
||
type = short_unsigned_type_node;
|
||
else if (type == char_type_node)
|
||
type = unsigned_char_type_node;
|
||
else if (typedef_decl)
|
||
type = c_common_unsigned_type (type);
|
||
else
|
||
type = unsigned_type_node;
|
||
}
|
||
else if ((specbits & 1 << (int) RID_SIGNED)
|
||
&& type == char_type_node)
|
||
type = signed_char_type_node;
|
||
else if (longlong)
|
||
type = long_long_integer_type_node;
|
||
else if (specbits & 1 << (int) RID_LONG)
|
||
type = long_integer_type_node;
|
||
else if (specbits & 1 << (int) RID_SHORT)
|
||
type = short_integer_type_node;
|
||
|
||
if (specbits & 1 << (int) RID_COMPLEX)
|
||
{
|
||
if (pedantic && !flag_isoc99)
|
||
pedwarn ("ISO C90 does not support complex types");
|
||
/* If we just have "complex", it is equivalent to
|
||
"complex double", but if any modifiers at all are specified it is
|
||
the complex form of TYPE. E.g, "complex short" is
|
||
"complex short int". */
|
||
|
||
if (defaulted_int && ! longlong
|
||
&& ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
|
||
| (1 << (int) RID_SIGNED)
|
||
| (1 << (int) RID_UNSIGNED))))
|
||
{
|
||
if (pedantic)
|
||
pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
|
||
type = complex_double_type_node;
|
||
}
|
||
else if (type == integer_type_node)
|
||
{
|
||
if (pedantic)
|
||
pedwarn ("ISO C does not support complex integer types");
|
||
type = complex_integer_type_node;
|
||
}
|
||
else if (type == float_type_node)
|
||
type = complex_float_type_node;
|
||
else if (type == double_type_node)
|
||
type = complex_double_type_node;
|
||
else if (type == long_double_type_node)
|
||
type = complex_long_double_type_node;
|
||
else
|
||
{
|
||
if (pedantic)
|
||
pedwarn ("ISO C does not support complex integer types");
|
||
type = build_complex_type (type);
|
||
}
|
||
}
|
||
|
||
/* Figure out the type qualifiers for the declaration. There are
|
||
two ways a declaration can become qualified. One is something
|
||
like `const int i' where the `const' is explicit. Another is
|
||
something like `typedef const int CI; CI i' where the type of the
|
||
declaration contains the `const'. */
|
||
constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
|
||
restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
|
||
volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
|
||
inlinep = !! (specbits & (1 << (int) RID_INLINE));
|
||
if (constp > 1 && ! flag_isoc99)
|
||
pedwarn ("duplicate `const'");
|
||
if (restrictp > 1 && ! flag_isoc99)
|
||
pedwarn ("duplicate `restrict'");
|
||
if (volatilep > 1 && ! flag_isoc99)
|
||
pedwarn ("duplicate `volatile'");
|
||
if (! flag_gen_aux_info && (TYPE_QUALS (type)))
|
||
type = TYPE_MAIN_VARIANT (type);
|
||
type_quals = ((constp ? TYPE_QUAL_CONST : 0)
|
||
| (restrictp ? TYPE_QUAL_RESTRICT : 0)
|
||
| (volatilep ? TYPE_QUAL_VOLATILE : 0));
|
||
|
||
/* Warn if two storage classes are given. Default to `auto'. */
|
||
|
||
{
|
||
int nclasses = 0;
|
||
|
||
if (specbits & 1 << (int) RID_AUTO) nclasses++;
|
||
if (specbits & 1 << (int) RID_STATIC) nclasses++;
|
||
if (specbits & 1 << (int) RID_EXTERN) nclasses++;
|
||
if (specbits & 1 << (int) RID_REGISTER) nclasses++;
|
||
if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
|
||
|
||
/* "static __thread" and "extern __thread" are allowed. */
|
||
if ((specbits & (1 << (int) RID_THREAD
|
||
| 1 << (int) RID_STATIC
|
||
| 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
|
||
nclasses++;
|
||
|
||
/* Warn about storage classes that are invalid for certain
|
||
kinds of declarations (parameters, typenames, etc.). */
|
||
|
||
if (nclasses > 1)
|
||
error ("multiple storage classes in declaration of `%s'", name);
|
||
else if (funcdef_flag
|
||
&& (specbits
|
||
& ((1 << (int) RID_REGISTER)
|
||
| (1 << (int) RID_AUTO)
|
||
| (1 << (int) RID_TYPEDEF)
|
||
| (1 << (int) RID_THREAD))))
|
||
{
|
||
if (specbits & 1 << (int) RID_AUTO
|
||
&& (pedantic || current_binding_level == global_binding_level))
|
||
pedwarn ("function definition declared `auto'");
|
||
if (specbits & 1 << (int) RID_REGISTER)
|
||
error ("function definition declared `register'");
|
||
if (specbits & 1 << (int) RID_TYPEDEF)
|
||
error ("function definition declared `typedef'");
|
||
if (specbits & 1 << (int) RID_THREAD)
|
||
error ("function definition declared `__thread'");
|
||
specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
|
||
| (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
|
||
}
|
||
else if (decl_context != NORMAL && nclasses > 0)
|
||
{
|
||
if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
|
||
;
|
||
else
|
||
{
|
||
switch (decl_context)
|
||
{
|
||
case FIELD:
|
||
error ("storage class specified for structure field `%s'",
|
||
name);
|
||
break;
|
||
case PARM:
|
||
error ("storage class specified for parameter `%s'", name);
|
||
break;
|
||
default:
|
||
error ("storage class specified for typename");
|
||
break;
|
||
}
|
||
specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
|
||
| (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
|
||
| (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
|
||
}
|
||
}
|
||
else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
|
||
{
|
||
/* `extern' with initialization is invalid if not at top level. */
|
||
if (current_binding_level == global_binding_level)
|
||
warning ("`%s' initialized and declared `extern'", name);
|
||
else
|
||
error ("`%s' has both `extern' and initializer", name);
|
||
}
|
||
else if (current_binding_level == global_binding_level)
|
||
{
|
||
if (specbits & 1 << (int) RID_AUTO)
|
||
error ("top-level declaration of `%s' specifies `auto'", name);
|
||
}
|
||
else
|
||
{
|
||
if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
|
||
error ("nested function `%s' declared `extern'", name);
|
||
else if ((specbits & (1 << (int) RID_THREAD
|
||
| 1 << (int) RID_EXTERN
|
||
| 1 << (int) RID_STATIC))
|
||
== (1 << (int) RID_THREAD))
|
||
{
|
||
error ("function-scope `%s' implicitly auto and declared `__thread'",
|
||
name);
|
||
specbits &= ~(1 << (int) RID_THREAD);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Now figure out the structure of the declarator proper.
|
||
Descend through it, creating more complex types, until we reach
|
||
the declared identifier (or NULL_TREE, in an absolute declarator). */
|
||
|
||
while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
|
||
{
|
||
if (type == error_mark_node)
|
||
{
|
||
declarator = TREE_OPERAND (declarator, 0);
|
||
continue;
|
||
}
|
||
|
||
/* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
|
||
an INDIRECT_REF (for *...),
|
||
a CALL_EXPR (for ...(...)),
|
||
a TREE_LIST (for nested attributes),
|
||
an identifier (for the name being declared)
|
||
or a null pointer (for the place in an absolute declarator
|
||
where the name was omitted).
|
||
For the last two cases, we have just exited the loop.
|
||
|
||
At this point, TYPE is the type of elements of an array,
|
||
or for a function to return, or for a pointer to point to.
|
||
After this sequence of ifs, TYPE is the type of the
|
||
array or function or pointer, and DECLARATOR has had its
|
||
outermost layer removed. */
|
||
|
||
if (array_ptr_quals != NULL_TREE || array_parm_static)
|
||
{
|
||
/* Only the innermost declarator (making a parameter be of
|
||
array type which is converted to pointer type)
|
||
may have static or type qualifiers. */
|
||
error ("static or type qualifiers in non-parameter array declarator");
|
||
array_ptr_quals = NULL_TREE;
|
||
array_parm_static = 0;
|
||
}
|
||
|
||
if (TREE_CODE (declarator) == TREE_LIST)
|
||
{
|
||
/* We encode a declarator with embedded attributes using
|
||
a TREE_LIST. */
|
||
tree attrs = TREE_PURPOSE (declarator);
|
||
tree inner_decl;
|
||
int attr_flags = 0;
|
||
declarator = TREE_VALUE (declarator);
|
||
inner_decl = declarator;
|
||
while (inner_decl != NULL_TREE
|
||
&& TREE_CODE (inner_decl) == TREE_LIST)
|
||
inner_decl = TREE_VALUE (inner_decl);
|
||
if (inner_decl == NULL_TREE
|
||
|| TREE_CODE (inner_decl) == IDENTIFIER_NODE)
|
||
attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
|
||
else if (TREE_CODE (inner_decl) == CALL_EXPR)
|
||
attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
|
||
else if (TREE_CODE (inner_decl) == ARRAY_REF)
|
||
attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
|
||
returned_attrs = decl_attributes (&type,
|
||
chainon (returned_attrs, attrs),
|
||
attr_flags);
|
||
}
|
||
else if (TREE_CODE (declarator) == ARRAY_REF)
|
||
{
|
||
tree itype = NULL_TREE;
|
||
tree size = TREE_OPERAND (declarator, 1);
|
||
/* The index is a signed object `sizetype' bits wide. */
|
||
tree index_type = c_common_signed_type (sizetype);
|
||
|
||
array_ptr_quals = TREE_TYPE (declarator);
|
||
array_parm_static = TREE_STATIC (declarator);
|
||
|
||
declarator = TREE_OPERAND (declarator, 0);
|
||
|
||
/* Check for some types that there cannot be arrays of. */
|
||
|
||
if (VOID_TYPE_P (type))
|
||
{
|
||
error ("declaration of `%s' as array of voids", name);
|
||
type = error_mark_node;
|
||
}
|
||
|
||
if (TREE_CODE (type) == FUNCTION_TYPE)
|
||
{
|
||
error ("declaration of `%s' as array of functions", name);
|
||
type = error_mark_node;
|
||
}
|
||
|
||
if (pedantic && flexible_array_type_p (type))
|
||
pedwarn ("invalid use of structure with flexible array member");
|
||
|
||
if (size == error_mark_node)
|
||
type = error_mark_node;
|
||
|
||
if (type == error_mark_node)
|
||
continue;
|
||
|
||
/* If size was specified, set ITYPE to a range-type for that size.
|
||
Otherwise, ITYPE remains null. finish_decl may figure it out
|
||
from an initial value. */
|
||
|
||
if (size)
|
||
{
|
||
/* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
|
||
STRIP_TYPE_NOPS (size);
|
||
|
||
if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
|
||
{
|
||
error ("size of array `%s' has non-integer type", name);
|
||
size = integer_one_node;
|
||
}
|
||
|
||
if (pedantic && integer_zerop (size))
|
||
pedwarn ("ISO C forbids zero-size array `%s'", name);
|
||
|
||
if (TREE_CODE (size) == INTEGER_CST)
|
||
{
|
||
constant_expression_warning (size);
|
||
if (tree_int_cst_sgn (size) < 0)
|
||
{
|
||
error ("size of array `%s' is negative", name);
|
||
size = integer_one_node;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* Make sure the array size remains visibly nonconstant
|
||
even if it is (eg) a const variable with known value. */
|
||
size_varies = 1;
|
||
|
||
if (!flag_isoc99 && pedantic)
|
||
{
|
||
if (TREE_CONSTANT (size))
|
||
pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
|
||
name);
|
||
else
|
||
pedwarn ("ISO C90 forbids variable-size array `%s'",
|
||
name);
|
||
}
|
||
}
|
||
|
||
if (integer_zerop (size))
|
||
{
|
||
/* A zero-length array cannot be represented with an
|
||
unsigned index type, which is what we'll get with
|
||
build_index_type. Create an open-ended range instead. */
|
||
itype = build_range_type (sizetype, size, NULL_TREE);
|
||
}
|
||
else
|
||
{
|
||
/* Compute the maximum valid index, that is, size - 1.
|
||
Do the calculation in index_type, so that if it is
|
||
a variable the computations will be done in the
|
||
proper mode. */
|
||
itype = fold (build (MINUS_EXPR, index_type,
|
||
convert (index_type, size),
|
||
convert (index_type, size_one_node)));
|
||
|
||
/* If that overflowed, the array is too big.
|
||
??? While a size of INT_MAX+1 technically shouldn't
|
||
cause an overflow (because we subtract 1), the overflow
|
||
is recorded during the conversion to index_type, before
|
||
the subtraction. Handling this case seems like an
|
||
unnecessary complication. */
|
||
if (TREE_OVERFLOW (itype))
|
||
{
|
||
error ("size of array `%s' is too large", name);
|
||
type = error_mark_node;
|
||
continue;
|
||
}
|
||
|
||
if (size_varies)
|
||
{
|
||
/* We must be able to distinguish the
|
||
SAVE_EXPR_CONTEXT for the variably-sized type
|
||
so that we can set it correctly in
|
||
set_save_expr_context. The convention is
|
||
that all SAVE_EXPRs that need to be reset
|
||
have NULL_TREE for their SAVE_EXPR_CONTEXT. */
|
||
tree cfd = current_function_decl;
|
||
if (decl_context == PARM)
|
||
current_function_decl = NULL_TREE;
|
||
itype = variable_size (itype);
|
||
if (decl_context == PARM)
|
||
current_function_decl = cfd;
|
||
}
|
||
itype = build_index_type (itype);
|
||
}
|
||
}
|
||
else if (decl_context == FIELD)
|
||
{
|
||
if (pedantic && !flag_isoc99 && !in_system_header)
|
||
pedwarn ("ISO C90 does not support flexible array members");
|
||
|
||
/* ISO C99 Flexible array members are effectively identical
|
||
to GCC's zero-length array extension. */
|
||
itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
|
||
}
|
||
|
||
/* If pedantic, complain about arrays of incomplete types. */
|
||
|
||
if (pedantic && !COMPLETE_TYPE_P (type))
|
||
pedwarn ("array type has incomplete element type");
|
||
|
||
#if 0
|
||
/* We shouldn't have a function type here at all!
|
||
Functions aren't allowed as array elements. */
|
||
if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
|
||
&& (constp || volatilep))
|
||
pedwarn ("ISO C forbids const or volatile function types");
|
||
#endif
|
||
|
||
/* Build the array type itself, then merge any constancy or
|
||
volatility into the target type. We must do it in this order
|
||
to ensure that the TYPE_MAIN_VARIANT field of the array type
|
||
is set correctly. */
|
||
|
||
type = build_array_type (type, itype);
|
||
if (type_quals)
|
||
type = c_build_qualified_type (type, type_quals);
|
||
|
||
if (size_varies)
|
||
C_TYPE_VARIABLE_SIZE (type) = 1;
|
||
|
||
/* The GCC extension for zero-length arrays differs from
|
||
ISO flexible array members in that sizeof yields zero. */
|
||
if (size && integer_zerop (size))
|
||
{
|
||
layout_type (type);
|
||
TYPE_SIZE (type) = bitsize_zero_node;
|
||
TYPE_SIZE_UNIT (type) = size_zero_node;
|
||
}
|
||
if (decl_context != PARM
|
||
&& (array_ptr_quals != NULL_TREE || array_parm_static))
|
||
{
|
||
error ("static or type qualifiers in non-parameter array declarator");
|
||
array_ptr_quals = NULL_TREE;
|
||
array_parm_static = 0;
|
||
}
|
||
}
|
||
else if (TREE_CODE (declarator) == CALL_EXPR)
|
||
{
|
||
tree arg_types;
|
||
|
||
/* Declaring a function type.
|
||
Make sure we have a valid type for the function to return. */
|
||
if (type == error_mark_node)
|
||
continue;
|
||
|
||
size_varies = 0;
|
||
|
||
/* Warn about some types functions can't return. */
|
||
|
||
if (TREE_CODE (type) == FUNCTION_TYPE)
|
||
{
|
||
error ("`%s' declared as function returning a function", name);
|
||
type = integer_type_node;
|
||
}
|
||
if (TREE_CODE (type) == ARRAY_TYPE)
|
||
{
|
||
error ("`%s' declared as function returning an array", name);
|
||
type = integer_type_node;
|
||
}
|
||
|
||
/* Construct the function type and go to the next
|
||
inner layer of declarator. */
|
||
|
||
arg_types = grokparms (TREE_OPERAND (declarator, 1),
|
||
funcdef_flag
|
||
/* Say it's a definition
|
||
only for the CALL_EXPR
|
||
closest to the identifier. */
|
||
&& TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
|
||
/* Type qualifiers before the return type of the function
|
||
qualify the return type, not the function type. */
|
||
if (type_quals)
|
||
{
|
||
/* Type qualifiers on a function return type are normally
|
||
permitted by the standard but have no effect, so give a
|
||
warning at -W. Qualifiers on a void return type have
|
||
meaning as a GNU extension, and are banned on function
|
||
definitions in ISO C. FIXME: strictly we shouldn't
|
||
pedwarn for qualified void return types except on function
|
||
definitions, but not doing so could lead to the undesirable
|
||
state of a "volatile void" function return type not being
|
||
warned about, and a use of the function being compiled
|
||
with GNU semantics, with no diagnostics under -pedantic. */
|
||
if (VOID_TYPE_P (type) && pedantic && !in_system_header)
|
||
pedwarn ("ISO C forbids qualified void function return type");
|
||
else if (extra_warnings
|
||
&& !(VOID_TYPE_P (type)
|
||
&& type_quals == TYPE_QUAL_VOLATILE))
|
||
warning ("type qualifiers ignored on function return type");
|
||
|
||
type = c_build_qualified_type (type, type_quals);
|
||
}
|
||
type_quals = TYPE_UNQUALIFIED;
|
||
|
||
type = build_function_type (type, arg_types);
|
||
declarator = TREE_OPERAND (declarator, 0);
|
||
|
||
/* Set the TYPE_CONTEXTs for each tagged type which is local to
|
||
the formal parameter list of this FUNCTION_TYPE to point to
|
||
the FUNCTION_TYPE node itself. */
|
||
|
||
{
|
||
tree link;
|
||
|
||
for (link = last_function_parm_tags;
|
||
link;
|
||
link = TREE_CHAIN (link))
|
||
TYPE_CONTEXT (TREE_VALUE (link)) = type;
|
||
}
|
||
}
|
||
else if (TREE_CODE (declarator) == INDIRECT_REF)
|
||
{
|
||
/* Merge any constancy or volatility into the target type
|
||
for the pointer. */
|
||
|
||
if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
|
||
&& type_quals)
|
||
pedwarn ("ISO C forbids qualified function types");
|
||
if (type_quals)
|
||
type = c_build_qualified_type (type, type_quals);
|
||
type_quals = TYPE_UNQUALIFIED;
|
||
size_varies = 0;
|
||
|
||
type = build_pointer_type (type);
|
||
|
||
/* Process a list of type modifier keywords
|
||
(such as const or volatile) that were given inside the `*'. */
|
||
|
||
if (TREE_TYPE (declarator))
|
||
{
|
||
tree typemodlist;
|
||
int erred = 0;
|
||
|
||
constp = 0;
|
||
volatilep = 0;
|
||
restrictp = 0;
|
||
for (typemodlist = TREE_TYPE (declarator); typemodlist;
|
||
typemodlist = TREE_CHAIN (typemodlist))
|
||
{
|
||
tree qualifier = TREE_VALUE (typemodlist);
|
||
|
||
if (C_IS_RESERVED_WORD (qualifier))
|
||
{
|
||
if (C_RID_CODE (qualifier) == RID_CONST)
|
||
constp++;
|
||
else if (C_RID_CODE (qualifier) == RID_VOLATILE)
|
||
volatilep++;
|
||
else if (C_RID_CODE (qualifier) == RID_RESTRICT)
|
||
restrictp++;
|
||
else
|
||
erred++;
|
||
}
|
||
else
|
||
erred++;
|
||
}
|
||
|
||
if (erred)
|
||
error ("invalid type modifier within pointer declarator");
|
||
if (constp > 1 && ! flag_isoc99)
|
||
pedwarn ("duplicate `const'");
|
||
if (volatilep > 1 && ! flag_isoc99)
|
||
pedwarn ("duplicate `volatile'");
|
||
if (restrictp > 1 && ! flag_isoc99)
|
||
pedwarn ("duplicate `restrict'");
|
||
|
||
type_quals = ((constp ? TYPE_QUAL_CONST : 0)
|
||
| (restrictp ? TYPE_QUAL_RESTRICT : 0)
|
||
| (volatilep ? TYPE_QUAL_VOLATILE : 0));
|
||
}
|
||
|
||
declarator = TREE_OPERAND (declarator, 0);
|
||
}
|
||
else
|
||
abort ();
|
||
|
||
}
|
||
|
||
/* Now TYPE has the actual type. */
|
||
|
||
/* Did array size calculations overflow? */
|
||
|
||
if (TREE_CODE (type) == ARRAY_TYPE
|
||
&& COMPLETE_TYPE_P (type)
|
||
&& TREE_OVERFLOW (TYPE_SIZE (type)))
|
||
{
|
||
error ("size of array `%s' is too large", name);
|
||
/* If we proceed with the array type as it is, we'll eventually
|
||
crash in tree_low_cst(). */
|
||
type = error_mark_node;
|
||
}
|
||
|
||
/* If this is declaring a typedef name, return a TYPE_DECL. */
|
||
|
||
if (specbits & (1 << (int) RID_TYPEDEF))
|
||
{
|
||
tree decl;
|
||
/* Note that the grammar rejects storage classes
|
||
in typenames, fields or parameters */
|
||
if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
|
||
&& type_quals)
|
||
pedwarn ("ISO C forbids qualified function types");
|
||
if (type_quals)
|
||
type = c_build_qualified_type (type, type_quals);
|
||
decl = build_decl (TYPE_DECL, declarator, type);
|
||
if ((specbits & (1 << (int) RID_SIGNED))
|
||
|| (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
|
||
C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
|
||
decl_attributes (&decl, returned_attrs, 0);
|
||
return decl;
|
||
}
|
||
|
||
/* Detect the case of an array type of unspecified size
|
||
which came, as such, direct from a typedef name.
|
||
We must copy the type, so that each identifier gets
|
||
a distinct type, so that each identifier's size can be
|
||
controlled separately by its own initializer. */
|
||
|
||
if (type != 0 && typedef_type != 0
|
||
&& TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
|
||
&& TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
|
||
{
|
||
type = build_array_type (TREE_TYPE (type), 0);
|
||
if (size_varies)
|
||
C_TYPE_VARIABLE_SIZE (type) = 1;
|
||
}
|
||
|
||
/* If this is a type name (such as, in a cast or sizeof),
|
||
compute the type and return it now. */
|
||
|
||
if (decl_context == TYPENAME)
|
||
{
|
||
/* Note that the grammar rejects storage classes
|
||
in typenames, fields or parameters */
|
||
if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
|
||
&& type_quals)
|
||
pedwarn ("ISO C forbids const or volatile function types");
|
||
if (type_quals)
|
||
type = c_build_qualified_type (type, type_quals);
|
||
decl_attributes (&type, returned_attrs, 0);
|
||
return type;
|
||
}
|
||
|
||
/* Aside from typedefs and type names (handle above),
|
||
`void' at top level (not within pointer)
|
||
is allowed only in public variables.
|
||
We don't complain about parms either, but that is because
|
||
a better error message can be made later. */
|
||
|
||
if (VOID_TYPE_P (type) && decl_context != PARM
|
||
&& ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
|
||
&& ((specbits & (1 << (int) RID_EXTERN))
|
||
|| (current_binding_level == global_binding_level
|
||
&& !(specbits
|
||
& ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
|
||
{
|
||
error ("variable or field `%s' declared void", name);
|
||
type = integer_type_node;
|
||
}
|
||
|
||
/* Now create the decl, which may be a VAR_DECL, a PARM_DECL
|
||
or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
|
||
|
||
{
|
||
tree decl;
|
||
|
||
if (decl_context == PARM)
|
||
{
|
||
tree type_as_written;
|
||
tree promoted_type;
|
||
|
||
/* A parameter declared as an array of T is really a pointer to T.
|
||
One declared as a function is really a pointer to a function. */
|
||
|
||
if (TREE_CODE (type) == ARRAY_TYPE)
|
||
{
|
||
/* Transfer const-ness of array into that of type pointed to. */
|
||
type = TREE_TYPE (type);
|
||
if (type_quals)
|
||
type = c_build_qualified_type (type, type_quals);
|
||
type = build_pointer_type (type);
|
||
type_quals = TYPE_UNQUALIFIED;
|
||
if (array_ptr_quals)
|
||
{
|
||
tree new_ptr_quals, new_ptr_attrs;
|
||
int erred = 0;
|
||
split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
|
||
/* We don't yet implement attributes in this context. */
|
||
if (new_ptr_attrs != NULL_TREE)
|
||
warning ("attributes in parameter array declarator ignored");
|
||
|
||
constp = 0;
|
||
volatilep = 0;
|
||
restrictp = 0;
|
||
for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
|
||
{
|
||
tree qualifier = TREE_VALUE (new_ptr_quals);
|
||
|
||
if (C_IS_RESERVED_WORD (qualifier))
|
||
{
|
||
if (C_RID_CODE (qualifier) == RID_CONST)
|
||
constp++;
|
||
else if (C_RID_CODE (qualifier) == RID_VOLATILE)
|
||
volatilep++;
|
||
else if (C_RID_CODE (qualifier) == RID_RESTRICT)
|
||
restrictp++;
|
||
else
|
||
erred++;
|
||
}
|
||
else
|
||
erred++;
|
||
}
|
||
|
||
if (erred)
|
||
error ("invalid type modifier within array declarator");
|
||
|
||
type_quals = ((constp ? TYPE_QUAL_CONST : 0)
|
||
| (restrictp ? TYPE_QUAL_RESTRICT : 0)
|
||
| (volatilep ? TYPE_QUAL_VOLATILE : 0));
|
||
}
|
||
size_varies = 0;
|
||
}
|
||
else if (TREE_CODE (type) == FUNCTION_TYPE)
|
||
{
|
||
if (pedantic && type_quals)
|
||
pedwarn ("ISO C forbids qualified function types");
|
||
if (type_quals)
|
||
type = c_build_qualified_type (type, type_quals);
|
||
type = build_pointer_type (type);
|
||
type_quals = TYPE_UNQUALIFIED;
|
||
}
|
||
else if (type_quals)
|
||
type = c_build_qualified_type (type, type_quals);
|
||
|
||
type_as_written = type;
|
||
|
||
decl = build_decl (PARM_DECL, declarator, type);
|
||
if (size_varies)
|
||
C_DECL_VARIABLE_SIZE (decl) = 1;
|
||
|
||
/* Compute the type actually passed in the parmlist,
|
||
for the case where there is no prototype.
|
||
(For example, shorts and chars are passed as ints.)
|
||
When there is a prototype, this is overridden later. */
|
||
|
||
if (type == error_mark_node)
|
||
promoted_type = type;
|
||
else
|
||
promoted_type = c_type_promotes_to (type);
|
||
|
||
DECL_ARG_TYPE (decl) = promoted_type;
|
||
DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
|
||
}
|
||
else if (decl_context == FIELD)
|
||
{
|
||
/* Structure field. It may not be a function. */
|
||
|
||
if (TREE_CODE (type) == FUNCTION_TYPE)
|
||
{
|
||
error ("field `%s' declared as a function", name);
|
||
type = build_pointer_type (type);
|
||
}
|
||
else if (TREE_CODE (type) != ERROR_MARK
|
||
&& !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
|
||
{
|
||
error ("field `%s' has incomplete type", name);
|
||
type = error_mark_node;
|
||
}
|
||
/* Move type qualifiers down to element of an array. */
|
||
if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
|
||
{
|
||
type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
|
||
type_quals),
|
||
TYPE_DOMAIN (type));
|
||
#if 0
|
||
/* Leave the field const or volatile as well. */
|
||
type_quals = TYPE_UNQUALIFIED;
|
||
#endif
|
||
}
|
||
decl = build_decl (FIELD_DECL, declarator, type);
|
||
DECL_NONADDRESSABLE_P (decl) = bitfield;
|
||
|
||
if (size_varies)
|
||
C_DECL_VARIABLE_SIZE (decl) = 1;
|
||
}
|
||
else if (TREE_CODE (type) == FUNCTION_TYPE)
|
||
{
|
||
/* Every function declaration is "external"
|
||
except for those which are inside a function body
|
||
in which `auto' is used.
|
||
That is a case not specified by ANSI C,
|
||
and we use it for forward declarations for nested functions. */
|
||
int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
|
||
|| current_binding_level == global_binding_level);
|
||
|
||
if (specbits & (1 << (int) RID_AUTO)
|
||
&& (pedantic || current_binding_level == global_binding_level))
|
||
pedwarn ("invalid storage class for function `%s'", name);
|
||
if (specbits & (1 << (int) RID_REGISTER))
|
||
error ("invalid storage class for function `%s'", name);
|
||
if (specbits & (1 << (int) RID_THREAD))
|
||
error ("invalid storage class for function `%s'", name);
|
||
/* Function declaration not at top level.
|
||
Storage classes other than `extern' are not allowed
|
||
and `extern' makes no difference. */
|
||
if (current_binding_level != global_binding_level
|
||
&& (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
|
||
&& pedantic)
|
||
pedwarn ("invalid storage class for function `%s'", name);
|
||
|
||
decl = build_decl (FUNCTION_DECL, declarator, type);
|
||
decl = build_decl_attribute_variant (decl, decl_attr);
|
||
|
||
DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
|
||
ggc_alloc_cleared (sizeof (struct lang_decl));
|
||
|
||
if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
|
||
pedwarn ("ISO C forbids qualified function types");
|
||
|
||
/* GNU C interprets a `volatile void' return type to indicate
|
||
that the function does not return. */
|
||
if ((type_quals & TYPE_QUAL_VOLATILE)
|
||
&& !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
|
||
warning ("`noreturn' function returns non-void value");
|
||
|
||
if (extern_ref)
|
||
DECL_EXTERNAL (decl) = 1;
|
||
/* Record absence of global scope for `static' or `auto'. */
|
||
TREE_PUBLIC (decl)
|
||
= !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
|
||
|
||
if (defaulted_int)
|
||
C_FUNCTION_IMPLICIT_INT (decl) = 1;
|
||
|
||
/* Record presence of `inline', if it is reasonable. */
|
||
if (MAIN_NAME_P (declarator))
|
||
{
|
||
if (inlinep)
|
||
warning ("cannot inline function `main'");
|
||
}
|
||
else if (inlinep)
|
||
{
|
||
/* Assume that otherwise the function can be inlined. */
|
||
DECL_DECLARED_INLINE_P (decl) = 1;
|
||
|
||
/* Do not mark bare declarations as DECL_INLINE. Doing so
|
||
in the presence of multiple declarations can result in
|
||
the abstract origin pointing between the declarations,
|
||
which will confuse dwarf2out. */
|
||
if (initialized)
|
||
{
|
||
DECL_INLINE (decl) = 1;
|
||
if (specbits & (1 << (int) RID_EXTERN))
|
||
current_extern_inline = 1;
|
||
}
|
||
}
|
||
/* If -finline-functions, assume it can be inlined. This does
|
||
two things: let the function be deferred until it is actually
|
||
needed, and let dwarf2 know that the function is inlinable. */
|
||
else if (flag_inline_trees == 2 && initialized)
|
||
{
|
||
if (!DECL_INLINE (decl))
|
||
DID_INLINE_FUNC (decl) = 1;
|
||
DECL_INLINE (decl) = 1;
|
||
DECL_DECLARED_INLINE_P (decl) = 0;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* It's a variable. */
|
||
/* An uninitialized decl with `extern' is a reference. */
|
||
int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
|
||
|
||
/* Move type qualifiers down to element of an array. */
|
||
if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
|
||
{
|
||
int saved_align = TYPE_ALIGN(type);
|
||
type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
|
||
type_quals),
|
||
TYPE_DOMAIN (type));
|
||
TYPE_ALIGN (type) = saved_align;
|
||
#if 0 /* Leave the variable const or volatile as well. */
|
||
type_quals = TYPE_UNQUALIFIED;
|
||
#endif
|
||
}
|
||
else if (type_quals)
|
||
type = c_build_qualified_type (type, type_quals);
|
||
|
||
decl = build_decl (VAR_DECL, declarator, type);
|
||
if (size_varies)
|
||
C_DECL_VARIABLE_SIZE (decl) = 1;
|
||
|
||
if (inlinep)
|
||
pedwarn_with_decl (decl, "variable `%s' declared `inline'");
|
||
|
||
DECL_EXTERNAL (decl) = extern_ref;
|
||
|
||
/* At top level, the presence of a `static' or `register' storage
|
||
class specifier, or the absence of all storage class specifiers
|
||
makes this declaration a definition (perhaps tentative). Also,
|
||
the absence of both `static' and `register' makes it public. */
|
||
if (current_binding_level == global_binding_level)
|
||
{
|
||
TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
|
||
| (1 << (int) RID_REGISTER)));
|
||
TREE_STATIC (decl) = !extern_ref;
|
||
}
|
||
/* Not at top level, only `static' makes a static definition. */
|
||
else
|
||
{
|
||
TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
|
||
TREE_PUBLIC (decl) = extern_ref;
|
||
}
|
||
|
||
if (specbits & 1 << (int) RID_THREAD)
|
||
{
|
||
if (targetm.have_tls)
|
||
DECL_THREAD_LOCAL (decl) = 1;
|
||
else
|
||
/* A mere warning is sure to result in improper semantics
|
||
at runtime. Don't bother to allow this to compile. */
|
||
error ("thread-local storage not supported for this target");
|
||
}
|
||
}
|
||
|
||
/* Record `register' declaration for warnings on &
|
||
and in case doing stupid register allocation. */
|
||
|
||
if (specbits & (1 << (int) RID_REGISTER))
|
||
DECL_REGISTER (decl) = 1;
|
||
|
||
/* Record constancy and volatility. */
|
||
c_apply_type_quals_to_decl (type_quals, decl);
|
||
|
||
/* If a type has volatile components, it should be stored in memory.
|
||
Otherwise, the fact that those components are volatile
|
||
will be ignored, and would even crash the compiler. */
|
||
if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
|
||
c_mark_addressable (decl);
|
||
|
||
decl_attributes (&decl, returned_attrs, 0);
|
||
|
||
return decl;
|
||
}
|
||
}
|
||
|
||
/* Decode the parameter-list info for a function type or function definition.
|
||
The argument is the value returned by `get_parm_info' (or made in parse.y
|
||
if there is an identifier list instead of a parameter decl list).
|
||
These two functions are separate because when a function returns
|
||
or receives functions then each is called multiple times but the order
|
||
of calls is different. The last call to `grokparms' is always the one
|
||
that contains the formal parameter names of a function definition.
|
||
|
||
Store in `last_function_parms' a chain of the decls of parms.
|
||
Also store in `last_function_parm_tags' a chain of the struct, union,
|
||
and enum tags declared among the parms.
|
||
|
||
Return a list of arg types to use in the FUNCTION_TYPE for this function.
|
||
|
||
FUNCDEF_FLAG is nonzero for a function definition, 0 for
|
||
a mere declaration. A nonempty identifier-list gets an error message
|
||
when FUNCDEF_FLAG is zero. */
|
||
|
||
static tree
|
||
grokparms (parms_info, funcdef_flag)
|
||
tree parms_info;
|
||
int funcdef_flag;
|
||
{
|
||
tree first_parm = TREE_CHAIN (parms_info);
|
||
|
||
last_function_parms = TREE_PURPOSE (parms_info);
|
||
last_function_parm_tags = TREE_VALUE (parms_info);
|
||
|
||
if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
|
||
&& !in_system_header)
|
||
warning ("function declaration isn't a prototype");
|
||
|
||
if (first_parm != 0
|
||
&& TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
|
||
{
|
||
if (! funcdef_flag)
|
||
pedwarn ("parameter names (without types) in function declaration");
|
||
|
||
last_function_parms = first_parm;
|
||
return 0;
|
||
}
|
||
else
|
||
{
|
||
tree parm;
|
||
tree typelt;
|
||
/* We no longer test FUNCDEF_FLAG.
|
||
If the arg types are incomplete in a declaration,
|
||
they must include undefined tags.
|
||
These tags can never be defined in the scope of the declaration,
|
||
so the types can never be completed,
|
||
and no call can be compiled successfully. */
|
||
#if 0
|
||
/* In a fcn definition, arg types must be complete. */
|
||
if (funcdef_flag)
|
||
#endif
|
||
for (parm = last_function_parms, typelt = first_parm;
|
||
parm;
|
||
parm = TREE_CHAIN (parm))
|
||
/* Skip over any enumeration constants declared here. */
|
||
if (TREE_CODE (parm) == PARM_DECL)
|
||
{
|
||
/* Barf if the parameter itself has an incomplete type. */
|
||
tree type = TREE_VALUE (typelt);
|
||
if (type == error_mark_node)
|
||
continue;
|
||
if (!COMPLETE_TYPE_P (type))
|
||
{
|
||
if (funcdef_flag && DECL_NAME (parm) != 0)
|
||
error ("parameter `%s' has incomplete type",
|
||
IDENTIFIER_POINTER (DECL_NAME (parm)));
|
||
else
|
||
warning ("parameter has incomplete type");
|
||
if (funcdef_flag)
|
||
{
|
||
TREE_VALUE (typelt) = error_mark_node;
|
||
TREE_TYPE (parm) = error_mark_node;
|
||
}
|
||
}
|
||
#if 0
|
||
/* This has been replaced by parm_tags_warning, which
|
||
uses a more accurate criterion for what to warn
|
||
about. */
|
||
else
|
||
{
|
||
/* Now warn if is a pointer to an incomplete type. */
|
||
while (TREE_CODE (type) == POINTER_TYPE
|
||
|| TREE_CODE (type) == REFERENCE_TYPE)
|
||
type = TREE_TYPE (type);
|
||
type = TYPE_MAIN_VARIANT (type);
|
||
if (!COMPLETE_TYPE_P (type))
|
||
{
|
||
if (DECL_NAME (parm) != 0)
|
||
warning ("parameter `%s' points to incomplete type",
|
||
IDENTIFIER_POINTER (DECL_NAME (parm)));
|
||
else
|
||
warning ("parameter points to incomplete type");
|
||
}
|
||
}
|
||
#endif
|
||
typelt = TREE_CHAIN (typelt);
|
||
}
|
||
|
||
return first_parm;
|
||
}
|
||
}
|
||
|
||
/* Return a tree_list node with info on a parameter list just parsed.
|
||
The TREE_PURPOSE is a chain of decls of those parms.
|
||
The TREE_VALUE is a list of structure, union and enum tags defined.
|
||
The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
|
||
This tree_list node is later fed to `grokparms'.
|
||
|
||
VOID_AT_END nonzero means append `void' to the end of the type-list.
|
||
Zero means the parmlist ended with an ellipsis so don't append `void'. */
|
||
|
||
tree
|
||
get_parm_info (void_at_end)
|
||
int void_at_end;
|
||
{
|
||
tree decl, t;
|
||
tree types = 0;
|
||
int erred = 0;
|
||
tree tags = gettags ();
|
||
tree parms = getdecls ();
|
||
tree new_parms = 0;
|
||
tree order = current_binding_level->parm_order;
|
||
|
||
/* Just `void' (and no ellipsis) is special. There are really no parms.
|
||
But if the `void' is qualified (by `const' or `volatile') or has a
|
||
storage class specifier (`register'), then the behavior is undefined;
|
||
by not counting it as the special case of `void' we will cause an
|
||
error later. Typedefs for `void' are OK (see DR#157). */
|
||
if (void_at_end && parms != 0
|
||
&& TREE_CHAIN (parms) == 0
|
||
&& VOID_TYPE_P (TREE_TYPE (parms))
|
||
&& ! TREE_THIS_VOLATILE (parms)
|
||
&& ! TREE_READONLY (parms)
|
||
&& ! DECL_REGISTER (parms)
|
||
&& DECL_NAME (parms) == 0)
|
||
{
|
||
parms = NULL_TREE;
|
||
storedecls (NULL_TREE);
|
||
return tree_cons (NULL_TREE, NULL_TREE,
|
||
tree_cons (NULL_TREE, void_type_node, NULL_TREE));
|
||
}
|
||
|
||
/* Extract enumerator values and other non-parms declared with the parms.
|
||
Likewise any forward parm decls that didn't have real parm decls. */
|
||
for (decl = parms; decl;)
|
||
{
|
||
tree next = TREE_CHAIN (decl);
|
||
|
||
if (TREE_CODE (decl) != PARM_DECL)
|
||
{
|
||
TREE_CHAIN (decl) = new_parms;
|
||
new_parms = decl;
|
||
}
|
||
else if (TREE_ASM_WRITTEN (decl))
|
||
{
|
||
error_with_decl (decl,
|
||
"parameter `%s' has just a forward declaration");
|
||
TREE_CHAIN (decl) = new_parms;
|
||
new_parms = decl;
|
||
}
|
||
decl = next;
|
||
}
|
||
|
||
/* Put the parm decls back in the order they were in in the parm list. */
|
||
for (t = order; t; t = TREE_CHAIN (t))
|
||
{
|
||
if (TREE_CHAIN (t))
|
||
TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
|
||
else
|
||
TREE_CHAIN (TREE_VALUE (t)) = 0;
|
||
}
|
||
|
||
new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
|
||
new_parms);
|
||
|
||
/* Store the parmlist in the binding level since the old one
|
||
is no longer a valid list. (We have changed the chain pointers.) */
|
||
storedecls (new_parms);
|
||
|
||
for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
|
||
/* There may also be declarations for enumerators if an enumeration
|
||
type is declared among the parms. Ignore them here. */
|
||
if (TREE_CODE (decl) == PARM_DECL)
|
||
{
|
||
/* Since there is a prototype,
|
||
args are passed in their declared types. */
|
||
tree type = TREE_TYPE (decl);
|
||
DECL_ARG_TYPE (decl) = type;
|
||
if (PROMOTE_PROTOTYPES
|
||
&& INTEGRAL_TYPE_P (type)
|
||
&& TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
|
||
DECL_ARG_TYPE (decl) = integer_type_node;
|
||
|
||
types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
|
||
if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
|
||
&& DECL_NAME (decl) == 0)
|
||
{
|
||
error ("`void' in parameter list must be the entire list");
|
||
erred = 1;
|
||
}
|
||
}
|
||
|
||
if (void_at_end)
|
||
return tree_cons (new_parms, tags,
|
||
nreverse (tree_cons (NULL_TREE, void_type_node, types)));
|
||
|
||
return tree_cons (new_parms, tags, nreverse (types));
|
||
}
|
||
|
||
/* At end of parameter list, warn about any struct, union or enum tags
|
||
defined within. Do so because these types cannot ever become complete. */
|
||
|
||
void
|
||
parmlist_tags_warning ()
|
||
{
|
||
tree elt;
|
||
static int already;
|
||
|
||
for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
|
||
{
|
||
enum tree_code code = TREE_CODE (TREE_VALUE (elt));
|
||
/* An anonymous union parm type is meaningful as a GNU extension.
|
||
So don't warn for that. */
|
||
if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
|
||
continue;
|
||
if (TREE_PURPOSE (elt) != 0)
|
||
{
|
||
if (code == RECORD_TYPE)
|
||
warning ("`struct %s' declared inside parameter list",
|
||
IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
|
||
else if (code == UNION_TYPE)
|
||
warning ("`union %s' declared inside parameter list",
|
||
IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
|
||
else
|
||
warning ("`enum %s' declared inside parameter list",
|
||
IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
|
||
}
|
||
else
|
||
{
|
||
/* For translation these need to be separate warnings */
|
||
if (code == RECORD_TYPE)
|
||
warning ("anonymous struct declared inside parameter list");
|
||
else if (code == UNION_TYPE)
|
||
warning ("anonymous union declared inside parameter list");
|
||
else
|
||
warning ("anonymous enum declared inside parameter list");
|
||
}
|
||
if (! already)
|
||
{
|
||
warning ("its scope is only this definition or declaration, which is probably not what you want");
|
||
already = 1;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Get the struct, enum or union (CODE says which) with tag NAME.
|
||
Define the tag as a forward-reference if it is not defined. */
|
||
|
||
tree
|
||
xref_tag (code, name)
|
||
enum tree_code code;
|
||
tree name;
|
||
{
|
||
/* If a cross reference is requested, look up the type
|
||
already defined for this tag and return it. */
|
||
|
||
tree ref = lookup_tag (code, name, current_binding_level, 0);
|
||
/* If this is the right type of tag, return what we found.
|
||
(This reference will be shadowed by shadow_tag later if appropriate.)
|
||
If this is the wrong type of tag, do not return it. If it was the
|
||
wrong type in the same binding level, we will have had an error
|
||
message already; if in a different binding level and declaring
|
||
a name, pending_xref_error will give an error message; but if in a
|
||
different binding level and not declaring a name, this tag should
|
||
shadow the previous declaration of a different type of tag, and
|
||
this would not work properly if we return the reference found.
|
||
(For example, with "struct foo" in an outer scope, "union foo;"
|
||
must shadow that tag with a new one of union type.) */
|
||
if (ref && TREE_CODE (ref) == code)
|
||
return ref;
|
||
|
||
/* If no such tag is yet defined, create a forward-reference node
|
||
and record it as the "definition".
|
||
When a real declaration of this type is found,
|
||
the forward-reference will be altered into a real type. */
|
||
|
||
ref = make_node (code);
|
||
if (code == ENUMERAL_TYPE)
|
||
{
|
||
/* Give the type a default layout like unsigned int
|
||
to avoid crashing if it does not get defined. */
|
||
TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
|
||
TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
|
||
TYPE_USER_ALIGN (ref) = 0;
|
||
TREE_UNSIGNED (ref) = 1;
|
||
TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
|
||
TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
|
||
TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
|
||
}
|
||
|
||
pushtag (name, ref);
|
||
|
||
return ref;
|
||
}
|
||
|
||
/* Make sure that the tag NAME is defined *in the current binding level*
|
||
at least as a forward reference.
|
||
CODE says which kind of tag NAME ought to be. */
|
||
|
||
tree
|
||
start_struct (code, name)
|
||
enum tree_code code;
|
||
tree name;
|
||
{
|
||
/* If there is already a tag defined at this binding level
|
||
(as a forward reference), just return it. */
|
||
|
||
tree ref = 0;
|
||
|
||
if (name != 0)
|
||
ref = lookup_tag (code, name, current_binding_level, 1);
|
||
if (ref && TREE_CODE (ref) == code)
|
||
{
|
||
if (TYPE_FIELDS (ref))
|
||
{
|
||
if (code == UNION_TYPE)
|
||
error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
|
||
else
|
||
error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* Otherwise create a forward-reference just so the tag is in scope. */
|
||
|
||
ref = make_node (code);
|
||
pushtag (name, ref);
|
||
}
|
||
|
||
C_TYPE_BEING_DEFINED (ref) = 1;
|
||
TYPE_PACKED (ref) = flag_pack_struct;
|
||
return ref;
|
||
}
|
||
|
||
/* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
|
||
of a structure component, returning a FIELD_DECL node.
|
||
WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
|
||
|
||
This is done during the parsing of the struct declaration.
|
||
The FIELD_DECL nodes are chained together and the lot of them
|
||
are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
|
||
|
||
tree
|
||
grokfield (filename, line, declarator, declspecs, width)
|
||
const char *filename ATTRIBUTE_UNUSED;
|
||
int line ATTRIBUTE_UNUSED;
|
||
tree declarator, declspecs, width;
|
||
{
|
||
tree value;
|
||
|
||
if (declarator == NULL_TREE && width == NULL_TREE)
|
||
{
|
||
/* This is an unnamed decl.
|
||
|
||
If we have something of the form "union { list } ;" then this
|
||
is the anonymous union extension. Similarly for struct.
|
||
|
||
If this is something of the form "struct foo;", then
|
||
If MS extensions are enabled, this is handled as an
|
||
anonymous struct.
|
||
Otherwise this is a forward declaration of a structure tag.
|
||
|
||
If this is something of the form "foo;" and foo is a TYPE_DECL, then
|
||
If MS extensions are enabled and foo names a structure, then
|
||
again this is an anonymous struct.
|
||
Otherwise this is an error.
|
||
|
||
Oh what a horrid tangled web we weave. I wonder if MS consiously
|
||
took this from Plan 9 or if it was an accident of implementation
|
||
that took root before someone noticed the bug... */
|
||
|
||
tree type = TREE_VALUE (declspecs);
|
||
|
||
if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
|
||
type = TREE_TYPE (type);
|
||
if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
|
||
{
|
||
if (flag_ms_extensions)
|
||
; /* ok */
|
||
else if (flag_iso)
|
||
goto warn_unnamed_field;
|
||
else if (TYPE_NAME (type) == NULL)
|
||
; /* ok */
|
||
else
|
||
goto warn_unnamed_field;
|
||
}
|
||
else
|
||
{
|
||
warn_unnamed_field:
|
||
warning ("declaration does not declare anything");
|
||
return NULL_TREE;
|
||
}
|
||
}
|
||
|
||
value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
|
||
|
||
finish_decl (value, NULL_TREE, NULL_TREE);
|
||
DECL_INITIAL (value) = width;
|
||
|
||
if (flag_objc)
|
||
objc_check_decl (value);
|
||
return value;
|
||
}
|
||
|
||
/* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
|
||
FIELDLIST is a chain of FIELD_DECL nodes for the fields.
|
||
ATTRIBUTES are attributes to be applied to the structure. */
|
||
|
||
tree
|
||
finish_struct (t, fieldlist, attributes)
|
||
tree t;
|
||
tree fieldlist;
|
||
tree attributes;
|
||
{
|
||
tree x;
|
||
int toplevel = global_binding_level == current_binding_level;
|
||
int saw_named_field;
|
||
|
||
/* If this type was previously laid out as a forward reference,
|
||
make sure we lay it out again. */
|
||
|
||
TYPE_SIZE (t) = 0;
|
||
|
||
decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
|
||
|
||
/* Nameless union parm types are useful as GCC extension. */
|
||
if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
|
||
/* Otherwise, warn about any struct or union def. in parmlist. */
|
||
if (in_parm_level_p ())
|
||
{
|
||
if (pedantic)
|
||
pedwarn ("%s defined inside parms",
|
||
TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
|
||
else
|
||
warning ("%s defined inside parms",
|
||
TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
|
||
}
|
||
|
||
if (pedantic)
|
||
{
|
||
for (x = fieldlist; x; x = TREE_CHAIN (x))
|
||
if (DECL_NAME (x) != 0)
|
||
break;
|
||
|
||
if (x == 0)
|
||
pedwarn ("%s has no %s",
|
||
TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
|
||
fieldlist ? _("named members") : _("members"));
|
||
}
|
||
|
||
/* Install struct as DECL_CONTEXT of each field decl.
|
||
Also process specified field sizes,m which is found in the DECL_INITIAL.
|
||
Store 0 there, except for ": 0" fields (so we can find them
|
||
and delete them, below). */
|
||
|
||
saw_named_field = 0;
|
||
for (x = fieldlist; x; x = TREE_CHAIN (x))
|
||
{
|
||
DECL_CONTEXT (x) = t;
|
||
DECL_PACKED (x) |= TYPE_PACKED (t);
|
||
|
||
/* If any field is const, the structure type is pseudo-const. */
|
||
if (TREE_READONLY (x))
|
||
C_TYPE_FIELDS_READONLY (t) = 1;
|
||
else
|
||
{
|
||
/* A field that is pseudo-const makes the structure likewise. */
|
||
tree t1 = TREE_TYPE (x);
|
||
while (TREE_CODE (t1) == ARRAY_TYPE)
|
||
t1 = TREE_TYPE (t1);
|
||
if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
|
||
&& C_TYPE_FIELDS_READONLY (t1))
|
||
C_TYPE_FIELDS_READONLY (t) = 1;
|
||
}
|
||
|
||
/* Any field that is volatile means variables of this type must be
|
||
treated in some ways as volatile. */
|
||
if (TREE_THIS_VOLATILE (x))
|
||
C_TYPE_FIELDS_VOLATILE (t) = 1;
|
||
|
||
/* Any field of nominal variable size implies structure is too. */
|
||
if (C_DECL_VARIABLE_SIZE (x))
|
||
C_TYPE_VARIABLE_SIZE (t) = 1;
|
||
|
||
/* Detect invalid nested redefinition. */
|
||
if (TREE_TYPE (x) == t)
|
||
error ("nested redefinition of `%s'",
|
||
IDENTIFIER_POINTER (TYPE_NAME (t)));
|
||
|
||
/* Detect invalid bit-field size. */
|
||
if (DECL_INITIAL (x))
|
||
STRIP_NOPS (DECL_INITIAL (x));
|
||
if (DECL_INITIAL (x))
|
||
{
|
||
if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
|
||
constant_expression_warning (DECL_INITIAL (x));
|
||
else
|
||
{
|
||
error_with_decl (x,
|
||
"bit-field `%s' width not an integer constant");
|
||
DECL_INITIAL (x) = NULL;
|
||
}
|
||
}
|
||
|
||
/* Detect invalid bit-field type. */
|
||
if (DECL_INITIAL (x)
|
||
&& TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
|
||
&& TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
|
||
&& TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
|
||
{
|
||
error_with_decl (x, "bit-field `%s' has invalid type");
|
||
DECL_INITIAL (x) = NULL;
|
||
}
|
||
|
||
if (DECL_INITIAL (x) && pedantic
|
||
&& TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
|
||
&& TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
|
||
&& TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
|
||
/* Accept an enum that's equivalent to int or unsigned int. */
|
||
&& !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
|
||
&& (TYPE_PRECISION (TREE_TYPE (x))
|
||
== TYPE_PRECISION (integer_type_node))))
|
||
pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
|
||
|
||
/* Detect and ignore out of range field width and process valid
|
||
field widths. */
|
||
if (DECL_INITIAL (x))
|
||
{
|
||
int max_width
|
||
= (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node
|
||
? CHAR_TYPE_SIZE : TYPE_PRECISION (TREE_TYPE (x)));
|
||
|
||
if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
|
||
error_with_decl (x, "negative width in bit-field `%s'");
|
||
else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
|
||
pedwarn_with_decl (x, "width of `%s' exceeds its type");
|
||
else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
|
||
error_with_decl (x, "zero width for bit-field `%s'");
|
||
else
|
||
{
|
||
/* The test above has assured us that TREE_INT_CST_HIGH is 0. */
|
||
unsigned HOST_WIDE_INT width
|
||
= tree_low_cst (DECL_INITIAL (x), 1);
|
||
|
||
if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
|
||
&& (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
|
||
TREE_UNSIGNED (TREE_TYPE (x)))
|
||
|| (width
|
||
< min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
|
||
TREE_UNSIGNED (TREE_TYPE (x))))))
|
||
warning_with_decl (x,
|
||
"`%s' is narrower than values of its type");
|
||
|
||
DECL_SIZE (x) = bitsize_int (width);
|
||
DECL_BIT_FIELD (x) = 1;
|
||
SET_DECL_C_BIT_FIELD (x);
|
||
|
||
if (width == 0
|
||
&& ! (* targetm.ms_bitfield_layout_p) (t))
|
||
{
|
||
/* field size 0 => force desired amount of alignment. */
|
||
#ifdef EMPTY_FIELD_BOUNDARY
|
||
DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
|
||
#endif
|
||
#ifdef PCC_BITFIELD_TYPE_MATTERS
|
||
if (PCC_BITFIELD_TYPE_MATTERS)
|
||
{
|
||
DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
|
||
TYPE_ALIGN (TREE_TYPE (x)));
|
||
DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
|
||
}
|
||
#endif
|
||
}
|
||
}
|
||
}
|
||
|
||
DECL_INITIAL (x) = 0;
|
||
|
||
/* Detect flexible array member in an invalid context. */
|
||
if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
|
||
&& TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
|
||
&& TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
|
||
&& TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
|
||
{
|
||
if (TREE_CODE (t) == UNION_TYPE)
|
||
error_with_decl (x, "flexible array member in union");
|
||
else if (TREE_CHAIN (x) != NULL_TREE)
|
||
error_with_decl (x, "flexible array member not at end of struct");
|
||
else if (! saw_named_field)
|
||
error_with_decl (x, "flexible array member in otherwise empty struct");
|
||
}
|
||
|
||
if (pedantic && TREE_CODE (t) == RECORD_TYPE
|
||
&& flexible_array_type_p (TREE_TYPE (x)))
|
||
pedwarn_with_decl (x, "invalid use of structure with flexible array member");
|
||
|
||
if (DECL_NAME (x))
|
||
saw_named_field = 1;
|
||
}
|
||
|
||
/* Delete all duplicate fields from the fieldlist */
|
||
for (x = fieldlist; x && TREE_CHAIN (x);)
|
||
/* Anonymous fields aren't duplicates. */
|
||
if (DECL_NAME (TREE_CHAIN (x)) == 0)
|
||
x = TREE_CHAIN (x);
|
||
else
|
||
{
|
||
tree y = fieldlist;
|
||
|
||
while (1)
|
||
{
|
||
if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
|
||
break;
|
||
if (y == x)
|
||
break;
|
||
y = TREE_CHAIN (y);
|
||
}
|
||
if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
|
||
{
|
||
error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
|
||
TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
|
||
}
|
||
else
|
||
x = TREE_CHAIN (x);
|
||
}
|
||
|
||
/* Now we have the nearly final fieldlist. Record it,
|
||
then lay out the structure or union (including the fields). */
|
||
|
||
TYPE_FIELDS (t) = fieldlist;
|
||
|
||
layout_type (t);
|
||
|
||
/* Delete all zero-width bit-fields from the fieldlist */
|
||
{
|
||
tree *fieldlistp = &fieldlist;
|
||
while (*fieldlistp)
|
||
if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
|
||
*fieldlistp = TREE_CHAIN (*fieldlistp);
|
||
else
|
||
fieldlistp = &TREE_CHAIN (*fieldlistp);
|
||
}
|
||
|
||
/* Now we have the truly final field list.
|
||
Store it in this type and in the variants. */
|
||
|
||
TYPE_FIELDS (t) = fieldlist;
|
||
|
||
for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
|
||
{
|
||
TYPE_FIELDS (x) = TYPE_FIELDS (t);
|
||
TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
|
||
TYPE_ALIGN (x) = TYPE_ALIGN (t);
|
||
TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
|
||
}
|
||
|
||
/* If this was supposed to be a transparent union, but we can't
|
||
make it one, warn and turn off the flag. */
|
||
if (TREE_CODE (t) == UNION_TYPE
|
||
&& TYPE_TRANSPARENT_UNION (t)
|
||
&& TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
|
||
{
|
||
TYPE_TRANSPARENT_UNION (t) = 0;
|
||
warning ("union cannot be made transparent");
|
||
}
|
||
|
||
/* If this structure or union completes the type of any previous
|
||
variable declaration, lay it out and output its rtl. */
|
||
|
||
if (current_binding_level->incomplete_list != NULL_TREE)
|
||
{
|
||
tree prev = NULL_TREE;
|
||
|
||
for (x = current_binding_level->incomplete_list; x; x = TREE_CHAIN (x))
|
||
{
|
||
tree decl = TREE_VALUE (x);
|
||
|
||
if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
|
||
&& TREE_CODE (decl) != TYPE_DECL)
|
||
{
|
||
layout_decl (decl, 0);
|
||
/* This is a no-op in c-lang.c or something real in objc-act.c. */
|
||
if (flag_objc)
|
||
objc_check_decl (decl);
|
||
rest_of_decl_compilation (decl, NULL, toplevel, 0);
|
||
if (! toplevel)
|
||
expand_decl (decl);
|
||
/* Unlink X from the incomplete list. */
|
||
if (prev)
|
||
TREE_CHAIN (prev) = TREE_CHAIN (x);
|
||
else
|
||
current_binding_level->incomplete_list = TREE_CHAIN (x);
|
||
}
|
||
else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
|
||
&& TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
|
||
{
|
||
tree element = TREE_TYPE (decl);
|
||
while (TREE_CODE (element) == ARRAY_TYPE)
|
||
element = TREE_TYPE (element);
|
||
if (element == t)
|
||
{
|
||
layout_array_type (TREE_TYPE (decl));
|
||
if (TREE_CODE (decl) != TYPE_DECL)
|
||
{
|
||
layout_decl (decl, 0);
|
||
if (flag_objc)
|
||
objc_check_decl (decl);
|
||
rest_of_decl_compilation (decl, NULL, toplevel, 0);
|
||
if (! toplevel)
|
||
expand_decl (decl);
|
||
}
|
||
/* Unlink X from the incomplete list. */
|
||
if (prev)
|
||
TREE_CHAIN (prev) = TREE_CHAIN (x);
|
||
else
|
||
current_binding_level->incomplete_list = TREE_CHAIN (x);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Finish debugging output for this type. */
|
||
rest_of_type_compilation (t, toplevel);
|
||
|
||
return t;
|
||
}
|
||
|
||
/* Lay out the type T, and its element type, and so on. */
|
||
|
||
static void
|
||
layout_array_type (t)
|
||
tree t;
|
||
{
|
||
if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
|
||
layout_array_type (TREE_TYPE (t));
|
||
layout_type (t);
|
||
}
|
||
|
||
/* Begin compiling the definition of an enumeration type.
|
||
NAME is its name (or null if anonymous).
|
||
Returns the type object, as yet incomplete.
|
||
Also records info about it so that build_enumerator
|
||
may be used to declare the individual values as they are read. */
|
||
|
||
tree
|
||
start_enum (name)
|
||
tree name;
|
||
{
|
||
tree enumtype = 0;
|
||
|
||
/* If this is the real definition for a previous forward reference,
|
||
fill in the contents in the same object that used to be the
|
||
forward reference. */
|
||
|
||
if (name != 0)
|
||
enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
|
||
|
||
if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
|
||
{
|
||
enumtype = make_node (ENUMERAL_TYPE);
|
||
pushtag (name, enumtype);
|
||
}
|
||
|
||
C_TYPE_BEING_DEFINED (enumtype) = 1;
|
||
|
||
if (TYPE_VALUES (enumtype) != 0)
|
||
{
|
||
/* This enum is a named one that has been declared already. */
|
||
error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
|
||
|
||
/* Completely replace its old definition.
|
||
The old enumerators remain defined, however. */
|
||
TYPE_VALUES (enumtype) = 0;
|
||
}
|
||
|
||
enum_next_value = integer_zero_node;
|
||
enum_overflow = 0;
|
||
|
||
if (flag_short_enums)
|
||
TYPE_PACKED (enumtype) = 1;
|
||
|
||
return enumtype;
|
||
}
|
||
|
||
/* After processing and defining all the values of an enumeration type,
|
||
install their decls in the enumeration type and finish it off.
|
||
ENUMTYPE is the type object, VALUES a list of decl-value pairs,
|
||
and ATTRIBUTES are the specified attributes.
|
||
Returns ENUMTYPE. */
|
||
|
||
tree
|
||
finish_enum (enumtype, values, attributes)
|
||
tree enumtype;
|
||
tree values;
|
||
tree attributes;
|
||
{
|
||
tree pair, tem;
|
||
tree minnode = 0, maxnode = 0, enum_value_type;
|
||
int precision, unsign;
|
||
int toplevel = (global_binding_level == current_binding_level);
|
||
|
||
if (in_parm_level_p ())
|
||
warning ("enum defined inside parms");
|
||
|
||
decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
|
||
|
||
/* Calculate the maximum value of any enumerator in this type. */
|
||
|
||
if (values == error_mark_node)
|
||
minnode = maxnode = integer_zero_node;
|
||
else
|
||
{
|
||
minnode = maxnode = TREE_VALUE (values);
|
||
for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
|
||
{
|
||
tree value = TREE_VALUE (pair);
|
||
if (tree_int_cst_lt (maxnode, value))
|
||
maxnode = value;
|
||
if (tree_int_cst_lt (value, minnode))
|
||
minnode = value;
|
||
}
|
||
}
|
||
|
||
/* Construct the final type of this enumeration. It is the same
|
||
as one of the integral types - the narrowest one that fits, except
|
||
that normally we only go as narrow as int - and signed iff any of
|
||
the values are negative. */
|
||
unsign = (tree_int_cst_sgn (minnode) >= 0);
|
||
precision = MAX (min_precision (minnode, unsign),
|
||
min_precision (maxnode, unsign));
|
||
if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
|
||
{
|
||
tree narrowest = c_common_type_for_size (precision, unsign);
|
||
if (narrowest == 0)
|
||
{
|
||
warning ("enumeration values exceed range of largest integer");
|
||
narrowest = long_long_integer_type_node;
|
||
}
|
||
|
||
precision = TYPE_PRECISION (narrowest);
|
||
}
|
||
else
|
||
precision = TYPE_PRECISION (integer_type_node);
|
||
|
||
if (precision == TYPE_PRECISION (integer_type_node))
|
||
enum_value_type = c_common_type_for_size (precision, 0);
|
||
else
|
||
enum_value_type = enumtype;
|
||
|
||
TYPE_MIN_VALUE (enumtype) = minnode;
|
||
TYPE_MAX_VALUE (enumtype) = maxnode;
|
||
TYPE_PRECISION (enumtype) = precision;
|
||
TREE_UNSIGNED (enumtype) = unsign;
|
||
TYPE_SIZE (enumtype) = 0;
|
||
layout_type (enumtype);
|
||
|
||
if (values != error_mark_node)
|
||
{
|
||
/* Change the type of the enumerators to be the enum type. We
|
||
need to do this irrespective of the size of the enum, for
|
||
proper type checking. Replace the DECL_INITIALs of the
|
||
enumerators, and the value slots of the list, with copies
|
||
that have the enum type; they cannot be modified in place
|
||
because they may be shared (e.g. integer_zero_node) Finally,
|
||
change the purpose slots to point to the names of the decls. */
|
||
for (pair = values; pair; pair = TREE_CHAIN (pair))
|
||
{
|
||
tree enu = TREE_PURPOSE (pair);
|
||
|
||
TREE_TYPE (enu) = enumtype;
|
||
DECL_SIZE (enu) = TYPE_SIZE (enumtype);
|
||
DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
|
||
DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
|
||
DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
|
||
DECL_MODE (enu) = TYPE_MODE (enumtype);
|
||
|
||
/* The ISO C Standard mandates enumerators to have type int,
|
||
even though the underlying type of an enum type is
|
||
unspecified. Here we convert any enumerators that fit in
|
||
an int to type int, to avoid promotions to unsigned types
|
||
when comparing integers with enumerators that fit in the
|
||
int range. When -pedantic is given, build_enumerator()
|
||
would have already taken care of those that don't fit. */
|
||
if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
|
||
DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
|
||
else
|
||
DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
|
||
|
||
TREE_PURPOSE (pair) = DECL_NAME (enu);
|
||
TREE_VALUE (pair) = DECL_INITIAL (enu);
|
||
}
|
||
|
||
TYPE_VALUES (enumtype) = values;
|
||
}
|
||
|
||
/* Fix up all variant types of this enum type. */
|
||
for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
|
||
{
|
||
if (tem == enumtype)
|
||
continue;
|
||
TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
|
||
TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
|
||
TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
|
||
TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
|
||
TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
|
||
TYPE_MODE (tem) = TYPE_MODE (enumtype);
|
||
TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
|
||
TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
|
||
TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
|
||
TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
|
||
}
|
||
|
||
/* Finish debugging output for this type. */
|
||
rest_of_type_compilation (enumtype, toplevel);
|
||
|
||
return enumtype;
|
||
}
|
||
|
||
/* Build and install a CONST_DECL for one value of the
|
||
current enumeration type (one that was begun with start_enum).
|
||
Return a tree-list containing the CONST_DECL and its value.
|
||
Assignment of sequential values by default is handled here. */
|
||
|
||
tree
|
||
build_enumerator (name, value)
|
||
tree name, value;
|
||
{
|
||
tree decl, type;
|
||
|
||
/* Validate and default VALUE. */
|
||
|
||
/* Remove no-op casts from the value. */
|
||
if (value)
|
||
STRIP_TYPE_NOPS (value);
|
||
|
||
if (value != 0)
|
||
{
|
||
if (TREE_CODE (value) == INTEGER_CST)
|
||
{
|
||
value = default_conversion (value);
|
||
constant_expression_warning (value);
|
||
}
|
||
else
|
||
{
|
||
error ("enumerator value for `%s' not integer constant",
|
||
IDENTIFIER_POINTER (name));
|
||
value = 0;
|
||
}
|
||
}
|
||
|
||
/* Default based on previous value. */
|
||
/* It should no longer be possible to have NON_LVALUE_EXPR
|
||
in the default. */
|
||
if (value == 0)
|
||
{
|
||
value = enum_next_value;
|
||
if (enum_overflow)
|
||
error ("overflow in enumeration values");
|
||
}
|
||
|
||
if (pedantic && ! int_fits_type_p (value, integer_type_node))
|
||
{
|
||
pedwarn ("ISO C restricts enumerator values to range of `int'");
|
||
value = convert (integer_type_node, value);
|
||
}
|
||
|
||
/* Set basis for default for next value. */
|
||
enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
|
||
enum_overflow = tree_int_cst_lt (enum_next_value, value);
|
||
|
||
/* Now create a declaration for the enum value name. */
|
||
|
||
type = TREE_TYPE (value);
|
||
type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
|
||
TYPE_PRECISION (integer_type_node)),
|
||
(TYPE_PRECISION (type)
|
||
>= TYPE_PRECISION (integer_type_node)
|
||
&& TREE_UNSIGNED (type)));
|
||
|
||
decl = build_decl (CONST_DECL, name, type);
|
||
DECL_INITIAL (decl) = convert (type, value);
|
||
pushdecl (decl);
|
||
|
||
return tree_cons (decl, value, NULL_TREE);
|
||
}
|
||
|
||
|
||
/* Create the FUNCTION_DECL for a function definition.
|
||
DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
|
||
the declaration; they describe the function's name and the type it returns,
|
||
but twisted together in a fashion that parallels the syntax of C.
|
||
|
||
This function creates a binding context for the function body
|
||
as well as setting up the FUNCTION_DECL in current_function_decl.
|
||
|
||
Returns 1 on success. If the DECLARATOR is not suitable for a function
|
||
(it defines a datum instead), we return 0, which tells
|
||
yyparse to report a parse error. */
|
||
|
||
int
|
||
start_function (declspecs, declarator, attributes)
|
||
tree declarator, declspecs, attributes;
|
||
{
|
||
tree decl1, old_decl;
|
||
tree restype;
|
||
int old_immediate_size_expand = immediate_size_expand;
|
||
|
||
current_function_returns_value = 0; /* Assume, until we see it does. */
|
||
current_function_returns_null = 0;
|
||
current_function_returns_abnormally = 0;
|
||
warn_about_return_type = 0;
|
||
current_extern_inline = 0;
|
||
named_labels = 0;
|
||
shadowed_labels = 0;
|
||
|
||
/* Don't expand any sizes in the return type of the function. */
|
||
immediate_size_expand = 0;
|
||
|
||
decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
|
||
|
||
/* If the declarator is not suitable for a function definition,
|
||
cause a syntax error. */
|
||
if (decl1 == 0)
|
||
{
|
||
immediate_size_expand = old_immediate_size_expand;
|
||
return 0;
|
||
}
|
||
|
||
decl_attributes (&decl1, attributes, 0);
|
||
|
||
/* If #pragma weak was used, mark the decl weak now. */
|
||
if (current_binding_level == global_binding_level)
|
||
maybe_apply_pragma_weak (decl1);
|
||
|
||
if (DECL_DECLARED_INLINE_P (decl1)
|
||
&& DECL_UNINLINABLE (decl1)
|
||
&& lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
|
||
warning_with_decl (decl1,
|
||
"inline function `%s' given attribute noinline");
|
||
|
||
announce_function (decl1);
|
||
|
||
if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
|
||
{
|
||
error ("return type is an incomplete type");
|
||
/* Make it return void instead. */
|
||
TREE_TYPE (decl1)
|
||
= build_function_type (void_type_node,
|
||
TYPE_ARG_TYPES (TREE_TYPE (decl1)));
|
||
}
|
||
|
||
if (warn_about_return_type)
|
||
pedwarn_c99 ("return type defaults to `int'");
|
||
|
||
/* Save the parm names or decls from this function's declarator
|
||
where store_parm_decls will find them. */
|
||
current_function_parms = last_function_parms;
|
||
current_function_parm_tags = last_function_parm_tags;
|
||
|
||
/* Make the init_value nonzero so pushdecl knows this is not tentative.
|
||
error_mark_node is replaced below (in poplevel) with the BLOCK. */
|
||
DECL_INITIAL (decl1) = error_mark_node;
|
||
|
||
/* If this definition isn't a prototype and we had a prototype declaration
|
||
before, copy the arg type info from that prototype.
|
||
But not if what we had before was a builtin function. */
|
||
old_decl = lookup_name_current_level (DECL_NAME (decl1));
|
||
if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
|
||
&& !DECL_BUILT_IN (old_decl)
|
||
&& (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
|
||
== TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
|
||
&& TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
|
||
{
|
||
TREE_TYPE (decl1) = TREE_TYPE (old_decl);
|
||
current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
|
||
current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
|
||
}
|
||
|
||
/* If there is no explicit declaration, look for any out-of-scope implicit
|
||
declarations. */
|
||
if (old_decl == 0)
|
||
old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
|
||
|
||
/* Optionally warn of old-fashioned def with no previous prototype. */
|
||
if (warn_strict_prototypes
|
||
&& TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
|
||
&& !(old_decl != 0
|
||
&& (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
|
||
|| (DECL_BUILT_IN (old_decl)
|
||
&& ! C_DECL_ANTICIPATED (old_decl))))
|
||
&& !(flag_bsd_no_warn_kr_main && 0 ==
|
||
strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1)))))
|
||
warning ("function declaration isn't a prototype");
|
||
/* Optionally warn of any global def with no previous prototype. */
|
||
else if (warn_missing_prototypes
|
||
&& TREE_PUBLIC (decl1)
|
||
&& !(old_decl != 0
|
||
&& (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
|
||
|| (DECL_BUILT_IN (old_decl)
|
||
&& ! C_DECL_ANTICIPATED (old_decl))))
|
||
&& ! MAIN_NAME_P (DECL_NAME (decl1)))
|
||
warning_with_decl (decl1, "no previous prototype for `%s'");
|
||
/* Optionally warn of any def with no previous prototype
|
||
if the function has already been used. */
|
||
else if (warn_missing_prototypes
|
||
&& old_decl != 0 && TREE_USED (old_decl)
|
||
&& TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
|
||
warning_with_decl (decl1,
|
||
"`%s' was used with no prototype before its definition");
|
||
/* Optionally warn of any global def with no previous declaration. */
|
||
else if (warn_missing_declarations
|
||
&& TREE_PUBLIC (decl1)
|
||
&& old_decl == 0
|
||
&& ! MAIN_NAME_P (DECL_NAME (decl1)))
|
||
warning_with_decl (decl1, "no previous declaration for `%s'");
|
||
/* Optionally warn of any def with no previous declaration
|
||
if the function has already been used. */
|
||
else if (warn_missing_declarations
|
||
&& old_decl != 0 && TREE_USED (old_decl)
|
||
&& old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
|
||
warning_with_decl (decl1,
|
||
"`%s' was used with no declaration before its definition");
|
||
|
||
/* This is a definition, not a reference.
|
||
So normally clear DECL_EXTERNAL.
|
||
However, `extern inline' acts like a declaration
|
||
except for defining how to inline. So set DECL_EXTERNAL in that case. */
|
||
DECL_EXTERNAL (decl1) = current_extern_inline;
|
||
|
||
/* This function exists in static storage.
|
||
(This does not mean `static' in the C sense!) */
|
||
TREE_STATIC (decl1) = 1;
|
||
|
||
/* A nested function is not global. */
|
||
if (current_function_decl != 0)
|
||
TREE_PUBLIC (decl1) = 0;
|
||
|
||
/* Warn for unlikely, improbable, or stupid declarations of `main'. */
|
||
if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
|
||
{
|
||
tree args;
|
||
int argct = 0;
|
||
|
||
if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
|
||
!= integer_type_node)
|
||
pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
|
||
|
||
for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
|
||
args = TREE_CHAIN (args))
|
||
{
|
||
tree type = args ? TREE_VALUE (args) : 0;
|
||
|
||
if (type == void_type_node)
|
||
break;
|
||
|
||
++argct;
|
||
switch (argct)
|
||
{
|
||
case 1:
|
||
if (TYPE_MAIN_VARIANT (type) != integer_type_node)
|
||
pedwarn_with_decl (decl1,
|
||
"first argument of `%s' should be `int'");
|
||
break;
|
||
|
||
case 2:
|
||
if (TREE_CODE (type) != POINTER_TYPE
|
||
|| TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
|
||
|| (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
|
||
!= char_type_node))
|
||
pedwarn_with_decl (decl1,
|
||
"second argument of `%s' should be `char **'");
|
||
break;
|
||
|
||
case 3:
|
||
if (TREE_CODE (type) != POINTER_TYPE
|
||
|| TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
|
||
|| (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
|
||
!= char_type_node))
|
||
pedwarn_with_decl (decl1,
|
||
"third argument of `%s' should probably be `char **'");
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* It is intentional that this message does not mention the third
|
||
argument because it's only mentioned in an appendix of the
|
||
standard. */
|
||
if (argct > 0 && (argct < 2 || argct > 3))
|
||
pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
|
||
|
||
if (! TREE_PUBLIC (decl1))
|
||
pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
|
||
}
|
||
|
||
/* Record the decl so that the function name is defined.
|
||
If we already have a decl for this name, and it is a FUNCTION_DECL,
|
||
use the old decl. */
|
||
|
||
current_function_decl = pushdecl (decl1);
|
||
|
||
pushlevel (0);
|
||
declare_parm_level (1);
|
||
current_binding_level->subblocks_tag_transparent = 1;
|
||
|
||
make_decl_rtl (current_function_decl, NULL);
|
||
|
||
restype = TREE_TYPE (TREE_TYPE (current_function_decl));
|
||
/* Promote the value to int before returning it. */
|
||
if (c_promoting_integer_type_p (restype))
|
||
{
|
||
/* It retains unsignedness if not really getting wider. */
|
||
if (TREE_UNSIGNED (restype)
|
||
&& (TYPE_PRECISION (restype)
|
||
== TYPE_PRECISION (integer_type_node)))
|
||
restype = unsigned_type_node;
|
||
else
|
||
restype = integer_type_node;
|
||
}
|
||
DECL_RESULT (current_function_decl)
|
||
= build_decl (RESULT_DECL, NULL_TREE, restype);
|
||
|
||
/* If this fcn was already referenced via a block-scope `extern' decl
|
||
(or an implicit decl), propagate certain information about the usage. */
|
||
if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
|
||
TREE_ADDRESSABLE (current_function_decl) = 1;
|
||
|
||
immediate_size_expand = old_immediate_size_expand;
|
||
|
||
start_fname_decls ();
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* Store the parameter declarations into the current function declaration.
|
||
This is called after parsing the parameter declarations, before
|
||
digesting the body of the function.
|
||
|
||
For an old-style definition, modify the function's type
|
||
to specify at least the number of arguments. */
|
||
|
||
void
|
||
store_parm_decls ()
|
||
{
|
||
tree fndecl = current_function_decl;
|
||
tree parm;
|
||
|
||
/* This is either a chain of PARM_DECLs (if a prototype was used)
|
||
or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
|
||
tree specparms = current_function_parms;
|
||
|
||
/* This is a list of types declared among parms in a prototype. */
|
||
tree parmtags = current_function_parm_tags;
|
||
|
||
/* This is a chain of PARM_DECLs from old-style parm declarations. */
|
||
tree parmdecls = getdecls ();
|
||
|
||
/* This is a chain of any other decls that came in among the parm
|
||
declarations. If a parm is declared with enum {foo, bar} x;
|
||
then CONST_DECLs for foo and bar are put here. */
|
||
tree nonparms = 0;
|
||
|
||
/* The function containing FNDECL, if any. */
|
||
tree context = decl_function_context (fndecl);
|
||
|
||
/* Nonzero if this definition is written with a prototype. */
|
||
int prototype = 0;
|
||
|
||
int saved_warn_shadow = warn_shadow;
|
||
|
||
/* Don't re-emit shadow warnings. */
|
||
warn_shadow = 0;
|
||
|
||
if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
|
||
{
|
||
/* This case is when the function was defined with an ANSI prototype.
|
||
The parms already have decls, so we need not do anything here
|
||
except record them as in effect
|
||
and complain if any redundant old-style parm decls were written. */
|
||
|
||
tree next;
|
||
tree others = 0;
|
||
|
||
prototype = 1;
|
||
|
||
if (parmdecls != 0)
|
||
{
|
||
tree decl, link;
|
||
|
||
error_with_decl (fndecl,
|
||
"parm types given both in parmlist and separately");
|
||
/* Get rid of the erroneous decls; don't keep them on
|
||
the list of parms, since they might not be PARM_DECLs. */
|
||
for (decl = current_binding_level->names;
|
||
decl; decl = TREE_CHAIN (decl))
|
||
if (DECL_NAME (decl))
|
||
IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
|
||
for (link = current_binding_level->shadowed;
|
||
link; link = TREE_CHAIN (link))
|
||
IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
|
||
current_binding_level->names = 0;
|
||
current_binding_level->shadowed = 0;
|
||
}
|
||
|
||
specparms = nreverse (specparms);
|
||
for (parm = specparms; parm; parm = next)
|
||
{
|
||
next = TREE_CHAIN (parm);
|
||
if (TREE_CODE (parm) == PARM_DECL)
|
||
{
|
||
if (DECL_NAME (parm) == 0)
|
||
error_with_decl (parm, "parameter name omitted");
|
||
else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
|
||
&& VOID_TYPE_P (TREE_TYPE (parm)))
|
||
{
|
||
error_with_decl (parm, "parameter `%s' declared void");
|
||
/* Change the type to error_mark_node so this parameter
|
||
will be ignored by assign_parms. */
|
||
TREE_TYPE (parm) = error_mark_node;
|
||
}
|
||
pushdecl (parm);
|
||
}
|
||
else
|
||
{
|
||
/* If we find an enum constant or a type tag,
|
||
put it aside for the moment. */
|
||
TREE_CHAIN (parm) = 0;
|
||
others = chainon (others, parm);
|
||
}
|
||
}
|
||
|
||
/* Get the decls in their original chain order
|
||
and record in the function. */
|
||
DECL_ARGUMENTS (fndecl) = getdecls ();
|
||
|
||
#if 0
|
||
/* If this function takes a variable number of arguments,
|
||
add a phony parameter to the end of the parm list,
|
||
to represent the position of the first unnamed argument. */
|
||
if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
|
||
!= void_type_node)
|
||
{
|
||
tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
|
||
/* Let's hope the address of the unnamed parm
|
||
won't depend on its type. */
|
||
TREE_TYPE (dummy) = integer_type_node;
|
||
DECL_ARG_TYPE (dummy) = integer_type_node;
|
||
DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
|
||
}
|
||
#endif
|
||
|
||
/* Now pushdecl the enum constants. */
|
||
for (parm = others; parm; parm = next)
|
||
{
|
||
next = TREE_CHAIN (parm);
|
||
if (DECL_NAME (parm) == 0)
|
||
;
|
||
else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
|
||
;
|
||
else if (TREE_CODE (parm) != PARM_DECL)
|
||
pushdecl (parm);
|
||
}
|
||
|
||
storetags (chainon (parmtags, gettags ()));
|
||
}
|
||
else
|
||
{
|
||
/* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
|
||
each with a parm name as the TREE_VALUE.
|
||
|
||
PARMDECLS is a chain of declarations for parameters.
|
||
Warning! It can also contain CONST_DECLs which are not parameters
|
||
but are names of enumerators of any enum types
|
||
declared among the parameters.
|
||
|
||
First match each formal parameter name with its declaration.
|
||
Associate decls with the names and store the decls
|
||
into the TREE_PURPOSE slots. */
|
||
|
||
/* We use DECL_WEAK as a flag to show which parameters have been
|
||
seen already since it is not used on PARM_DECL or CONST_DECL. */
|
||
for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
|
||
DECL_WEAK (parm) = 0;
|
||
|
||
for (parm = specparms; parm; parm = TREE_CHAIN (parm))
|
||
{
|
||
tree tail, found = NULL;
|
||
|
||
if (TREE_VALUE (parm) == 0)
|
||
{
|
||
error_with_decl (fndecl,
|
||
"parameter name missing from parameter list");
|
||
TREE_PURPOSE (parm) = 0;
|
||
continue;
|
||
}
|
||
|
||
/* See if any of the parmdecls specifies this parm by name.
|
||
Ignore any enumerator decls. */
|
||
for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
|
||
if (DECL_NAME (tail) == TREE_VALUE (parm)
|
||
&& TREE_CODE (tail) == PARM_DECL)
|
||
{
|
||
found = tail;
|
||
break;
|
||
}
|
||
|
||
/* If declaration already marked, we have a duplicate name.
|
||
Complain, and don't use this decl twice. */
|
||
if (found && DECL_WEAK (found))
|
||
{
|
||
error_with_decl (found, "multiple parameters named `%s'");
|
||
found = 0;
|
||
}
|
||
|
||
/* If the declaration says "void", complain and ignore it. */
|
||
if (found && VOID_TYPE_P (TREE_TYPE (found)))
|
||
{
|
||
error_with_decl (found, "parameter `%s' declared void");
|
||
TREE_TYPE (found) = integer_type_node;
|
||
DECL_ARG_TYPE (found) = integer_type_node;
|
||
layout_decl (found, 0);
|
||
}
|
||
|
||
/* If no declaration found, default to int. */
|
||
if (!found)
|
||
{
|
||
found = build_decl (PARM_DECL, TREE_VALUE (parm),
|
||
integer_type_node);
|
||
DECL_ARG_TYPE (found) = TREE_TYPE (found);
|
||
DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
|
||
DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
|
||
if (flag_isoc99)
|
||
pedwarn_with_decl (found, "type of `%s' defaults to `int'");
|
||
else if (extra_warnings)
|
||
warning_with_decl (found, "type of `%s' defaults to `int'");
|
||
pushdecl (found);
|
||
}
|
||
|
||
TREE_PURPOSE (parm) = found;
|
||
|
||
/* Mark this decl as "already found". */
|
||
DECL_WEAK (found) = 1;
|
||
}
|
||
|
||
/* Put anything which is on the parmdecls chain and which is
|
||
not a PARM_DECL onto the list NONPARMS. (The types of
|
||
non-parm things which might appear on the list include
|
||
enumerators and NULL-named TYPE_DECL nodes.) Complain about
|
||
any actual PARM_DECLs not matched with any names. */
|
||
|
||
nonparms = 0;
|
||
for (parm = parmdecls; parm;)
|
||
{
|
||
tree next = TREE_CHAIN (parm);
|
||
TREE_CHAIN (parm) = 0;
|
||
|
||
if (TREE_CODE (parm) != PARM_DECL)
|
||
nonparms = chainon (nonparms, parm);
|
||
else
|
||
{
|
||
/* Complain about args with incomplete types. */
|
||
if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
|
||
{
|
||
error_with_decl (parm, "parameter `%s' has incomplete type");
|
||
TREE_TYPE (parm) = error_mark_node;
|
||
}
|
||
|
||
if (! DECL_WEAK (parm))
|
||
{
|
||
error_with_decl (parm,
|
||
"declaration for parameter `%s' but no such parameter");
|
||
/* Pretend the parameter was not missing.
|
||
This gets us to a standard state and minimizes
|
||
further error messages. */
|
||
specparms
|
||
= chainon (specparms,
|
||
tree_cons (parm, NULL_TREE, NULL_TREE));
|
||
}
|
||
}
|
||
|
||
parm = next;
|
||
}
|
||
|
||
/* Chain the declarations together in the order of the list of
|
||
names. Store that chain in the function decl, replacing the
|
||
list of names. */
|
||
parm = specparms;
|
||
DECL_ARGUMENTS (fndecl) = 0;
|
||
{
|
||
tree last;
|
||
for (last = 0; parm; parm = TREE_CHAIN (parm))
|
||
if (TREE_PURPOSE (parm))
|
||
{
|
||
if (last == 0)
|
||
DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
|
||
else
|
||
TREE_CHAIN (last) = TREE_PURPOSE (parm);
|
||
last = TREE_PURPOSE (parm);
|
||
TREE_CHAIN (last) = 0;
|
||
}
|
||
}
|
||
|
||
/* If there was a previous prototype,
|
||
set the DECL_ARG_TYPE of each argument according to
|
||
the type previously specified, and report any mismatches. */
|
||
|
||
if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
|
||
{
|
||
tree type;
|
||
for (parm = DECL_ARGUMENTS (fndecl),
|
||
type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
|
||
parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
|
||
!= void_type_node));
|
||
parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
|
||
{
|
||
if (parm == 0 || type == 0
|
||
|| TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
|
||
{
|
||
error ("number of arguments doesn't match prototype");
|
||
error_with_file_and_line (current_function_prototype_file,
|
||
current_function_prototype_line,
|
||
"prototype declaration");
|
||
break;
|
||
}
|
||
/* Type for passing arg must be consistent with that
|
||
declared for the arg. ISO C says we take the unqualified
|
||
type for parameters declared with qualified type. */
|
||
if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
|
||
TYPE_MAIN_VARIANT (TREE_VALUE (type))))
|
||
{
|
||
if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
|
||
== TYPE_MAIN_VARIANT (TREE_VALUE (type)))
|
||
{
|
||
/* Adjust argument to match prototype. E.g. a previous
|
||
`int foo(float);' prototype causes
|
||
`int foo(x) float x; {...}' to be treated like
|
||
`int foo(float x) {...}'. This is particularly
|
||
useful for argument types like uid_t. */
|
||
DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
|
||
|
||
if (PROMOTE_PROTOTYPES
|
||
&& INTEGRAL_TYPE_P (TREE_TYPE (parm))
|
||
&& TYPE_PRECISION (TREE_TYPE (parm))
|
||
< TYPE_PRECISION (integer_type_node))
|
||
DECL_ARG_TYPE (parm) = integer_type_node;
|
||
|
||
if (pedantic)
|
||
{
|
||
pedwarn ("promoted argument `%s' doesn't match prototype",
|
||
IDENTIFIER_POINTER (DECL_NAME (parm)));
|
||
warning_with_file_and_line
|
||
(current_function_prototype_file,
|
||
current_function_prototype_line,
|
||
"prototype declaration");
|
||
}
|
||
}
|
||
else
|
||
{
|
||
error ("argument `%s' doesn't match prototype",
|
||
IDENTIFIER_POINTER (DECL_NAME (parm)));
|
||
error_with_file_and_line (current_function_prototype_file,
|
||
current_function_prototype_line,
|
||
"prototype declaration");
|
||
}
|
||
}
|
||
}
|
||
TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
|
||
}
|
||
|
||
/* Otherwise, create a prototype that would match. */
|
||
|
||
else
|
||
{
|
||
tree actual = 0, last = 0, type;
|
||
|
||
for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
|
||
{
|
||
type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
|
||
if (last)
|
||
TREE_CHAIN (last) = type;
|
||
else
|
||
actual = type;
|
||
last = type;
|
||
}
|
||
type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
|
||
if (last)
|
||
TREE_CHAIN (last) = type;
|
||
else
|
||
actual = type;
|
||
|
||
/* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
|
||
of the type of this function, but we need to avoid having this
|
||
affect the types of other similarly-typed functions, so we must
|
||
first force the generation of an identical (but separate) type
|
||
node for the relevant function type. The new node we create
|
||
will be a variant of the main variant of the original function
|
||
type. */
|
||
|
||
TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
|
||
|
||
TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
|
||
}
|
||
|
||
/* Now store the final chain of decls for the arguments
|
||
as the decl-chain of the current lexical scope.
|
||
Put the enumerators in as well, at the front so that
|
||
DECL_ARGUMENTS is not modified. */
|
||
|
||
storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
|
||
}
|
||
|
||
/* Make sure the binding level for the top of the function body
|
||
gets a BLOCK if there are any in the function.
|
||
Otherwise, the dbx output is wrong. */
|
||
|
||
keep_next_if_subblocks = 1;
|
||
|
||
/* ??? This might be an improvement,
|
||
but needs to be thought about some more. */
|
||
#if 0
|
||
keep_next_level_flag = 1;
|
||
#endif
|
||
|
||
/* Write a record describing this function definition to the prototypes
|
||
file (if requested). */
|
||
|
||
gen_aux_info_record (fndecl, 1, 0, prototype);
|
||
|
||
/* Initialize the RTL code for the function. */
|
||
init_function_start (fndecl, input_filename, lineno);
|
||
|
||
/* Begin the statement tree for this function. */
|
||
begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
|
||
|
||
/* If this is a nested function, save away the sizes of any
|
||
variable-size types so that we can expand them when generating
|
||
RTL. */
|
||
if (context)
|
||
{
|
||
tree t;
|
||
|
||
DECL_LANG_SPECIFIC (fndecl)->pending_sizes
|
||
= nreverse (get_pending_sizes ());
|
||
for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
|
||
t;
|
||
t = TREE_CHAIN (t))
|
||
SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
|
||
}
|
||
|
||
/* This function is being processed in whole-function mode. */
|
||
cfun->x_whole_function_mode_p = 1;
|
||
|
||
/* Even though we're inside a function body, we still don't want to
|
||
call expand_expr to calculate the size of a variable-sized array.
|
||
We haven't necessarily assigned RTL to all variables yet, so it's
|
||
not safe to try to expand expressions involving them. */
|
||
immediate_size_expand = 0;
|
||
cfun->x_dont_save_pending_sizes_p = 1;
|
||
|
||
warn_shadow = saved_warn_shadow;
|
||
}
|
||
|
||
/* Finish up a function declaration and compile that function
|
||
all the way to assembler language output. The free the storage
|
||
for the function definition.
|
||
|
||
This is called after parsing the body of the function definition.
|
||
|
||
NESTED is nonzero if the function being finished is nested in another.
|
||
CAN_DEFER_P is nonzero if the function may be deferred. */
|
||
|
||
void
|
||
finish_function (nested, can_defer_p)
|
||
int nested;
|
||
int can_defer_p;
|
||
{
|
||
tree fndecl = current_function_decl;
|
||
|
||
#if 0
|
||
/* This caused &foo to be of type ptr-to-const-function which then
|
||
got a warning when stored in a ptr-to-function variable. */
|
||
TREE_READONLY (fndecl) = 1;
|
||
#endif
|
||
|
||
poplevel (1, 0, 1);
|
||
BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
|
||
|
||
/* Must mark the RESULT_DECL as being in this function. */
|
||
|
||
DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
|
||
|
||
if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
|
||
{
|
||
if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
|
||
!= integer_type_node)
|
||
{
|
||
/* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
|
||
If warn_main is -1 (-Wno-main) we don't want to be warned. */
|
||
if (! warn_main)
|
||
pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
|
||
}
|
||
else
|
||
{
|
||
#ifdef DEFAULT_MAIN_RETURN
|
||
/* Make it so that `main' always returns success by default. */
|
||
DEFAULT_MAIN_RETURN;
|
||
#else
|
||
if (flag_isoc99)
|
||
c_expand_return (integer_zero_node);
|
||
#endif
|
||
}
|
||
}
|
||
|
||
finish_fname_decls ();
|
||
|
||
/* Tie off the statement tree for this function. */
|
||
finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
|
||
|
||
/* Complain if there's just no return statement. */
|
||
if (warn_return_type
|
||
&& TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
|
||
&& !current_function_returns_value && !current_function_returns_null
|
||
/* Don't complain if we abort. */
|
||
&& !current_function_returns_abnormally
|
||
/* Don't warn for main(). */
|
||
&& !MAIN_NAME_P (DECL_NAME (fndecl))
|
||
/* Or if they didn't actually specify a return type. */
|
||
&& !C_FUNCTION_IMPLICIT_INT (fndecl)
|
||
/* Normally, with -Wreturn-type, flow will complain. Unless we're an
|
||
inline function, as we might never be compiled separately. */
|
||
&& DECL_INLINE (fndecl))
|
||
warning ("no return statement in function returning non-void");
|
||
|
||
/* Clear out memory we no longer need. */
|
||
free_after_parsing (cfun);
|
||
/* Since we never call rest_of_compilation, we never clear
|
||
CFUN. Do so explicitly. */
|
||
free_after_compilation (cfun);
|
||
cfun = NULL;
|
||
|
||
if (! nested)
|
||
{
|
||
/* Generate RTL for the body of this function. */
|
||
c_expand_body (fndecl, nested, can_defer_p);
|
||
|
||
/* Let the error reporting routines know that we're outside a
|
||
function. For a nested function, this value is used in
|
||
c_pop_function_context and then reset via pop_function_context. */
|
||
current_function_decl = NULL;
|
||
}
|
||
}
|
||
|
||
/* Generate the RTL for a deferred function FNDECL. */
|
||
|
||
void
|
||
c_expand_deferred_function (fndecl)
|
||
tree fndecl;
|
||
{
|
||
/* DECL_INLINE or DECL_RESULT might got cleared after the inline
|
||
function was deferred, e.g. in duplicate_decls. */
|
||
if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
|
||
{
|
||
c_expand_body (fndecl, 0, 0);
|
||
current_function_decl = NULL;
|
||
}
|
||
}
|
||
|
||
/* Called to move the SAVE_EXPRs for parameter declarations in a
|
||
nested function into the nested function. DATA is really the
|
||
nested FUNCTION_DECL. */
|
||
|
||
static tree
|
||
set_save_expr_context (tp, walk_subtrees, data)
|
||
tree *tp;
|
||
int *walk_subtrees;
|
||
void *data;
|
||
{
|
||
if (TREE_CODE (*tp) == SAVE_EXPR && !SAVE_EXPR_CONTEXT (*tp))
|
||
SAVE_EXPR_CONTEXT (*tp) = (tree) data;
|
||
/* Do not walk back into the SAVE_EXPR_CONTEXT; that will cause
|
||
circularity. */
|
||
else if (DECL_P (*tp))
|
||
*walk_subtrees = 0;
|
||
|
||
return NULL_TREE;
|
||
}
|
||
|
||
/* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
|
||
then we are already in the process of generating RTL for another
|
||
function. If can_defer_p is zero, we won't attempt to defer the
|
||
generation of RTL. */
|
||
|
||
static void
|
||
c_expand_body (fndecl, nested_p, can_defer_p)
|
||
tree fndecl;
|
||
int nested_p, can_defer_p;
|
||
{
|
||
int uninlinable = 1;
|
||
int saved_lineno;
|
||
const char *saved_input_filename;
|
||
|
||
/* There's no reason to do any of the work here if we're only doing
|
||
semantic analysis; this code just generates RTL. */
|
||
if (flag_syntax_only)
|
||
return;
|
||
|
||
saved_lineno = lineno;
|
||
saved_input_filename = input_filename;
|
||
lineno = DECL_SOURCE_LINE (fndecl);
|
||
input_filename = DECL_SOURCE_FILE (fndecl);
|
||
|
||
if (flag_inline_trees)
|
||
{
|
||
/* First, cache whether the current function is inlinable. Some
|
||
predicates depend on cfun and current_function_decl to
|
||
function completely. */
|
||
timevar_push (TV_INTEGRATION);
|
||
uninlinable = ! tree_inlinable_function_p (fndecl);
|
||
|
||
if (! uninlinable && can_defer_p
|
||
/* Save function tree for inlining. Should return 0 if the
|
||
language does not support function deferring or the
|
||
function could not be deferred. */
|
||
&& defer_fn (fndecl))
|
||
{
|
||
/* Let the back-end know that this function exists. */
|
||
(*debug_hooks->deferred_inline_function) (fndecl);
|
||
timevar_pop (TV_INTEGRATION);
|
||
lineno = saved_lineno;
|
||
input_filename = saved_input_filename;
|
||
return;
|
||
}
|
||
|
||
/* Then, inline any functions called in it. */
|
||
optimize_inline_calls (fndecl);
|
||
timevar_pop (TV_INTEGRATION);
|
||
}
|
||
|
||
timevar_push (TV_EXPAND);
|
||
|
||
if (nested_p)
|
||
{
|
||
/* Make sure that we will evaluate variable-sized types involved
|
||
in our function's type. */
|
||
expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
|
||
/* Squirrel away our current state. */
|
||
push_function_context ();
|
||
}
|
||
|
||
/* Initialize the RTL code for the function. */
|
||
current_function_decl = fndecl;
|
||
init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
|
||
|
||
/* This function is being processed in whole-function mode. */
|
||
cfun->x_whole_function_mode_p = 1;
|
||
|
||
/* Even though we're inside a function body, we still don't want to
|
||
call expand_expr to calculate the size of a variable-sized array.
|
||
We haven't necessarily assigned RTL to all variables yet, so it's
|
||
not safe to try to expand expressions involving them. */
|
||
immediate_size_expand = 0;
|
||
cfun->x_dont_save_pending_sizes_p = 1;
|
||
|
||
/* Set up parameters and prepare for return, for the function. */
|
||
expand_function_start (fndecl, 0);
|
||
|
||
/* If the function has a variably modified type, there may be
|
||
SAVE_EXPRs in the parameter types. Their context must be set to
|
||
refer to this function; they cannot be expanded in the containing
|
||
function. */
|
||
if (decl_function_context (fndecl)
|
||
&& variably_modified_type_p (TREE_TYPE (fndecl)))
|
||
walk_tree (&TREE_TYPE (fndecl), set_save_expr_context, fndecl,
|
||
NULL);
|
||
|
||
/* If this function is `main', emit a call to `__main'
|
||
to run global initializers, etc. */
|
||
if (DECL_NAME (fndecl)
|
||
&& MAIN_NAME_P (DECL_NAME (fndecl))
|
||
&& DECL_CONTEXT (fndecl) == NULL_TREE)
|
||
expand_main_function ();
|
||
|
||
/* Generate the RTL for this function. */
|
||
expand_stmt (DECL_SAVED_TREE (fndecl));
|
||
|
||
/* Keep the function body if it's needed for inlining or dumping. */
|
||
if (uninlinable && !dump_enabled_p (TDI_all))
|
||
{
|
||
/* Allow the body of the function to be garbage collected. */
|
||
DECL_SAVED_TREE (fndecl) = NULL_TREE;
|
||
}
|
||
|
||
/* We hard-wired immediate_size_expand to zero above.
|
||
expand_function_end will decrement this variable. So, we set the
|
||
variable to one here, so that after the decrement it will remain
|
||
zero. */
|
||
immediate_size_expand = 1;
|
||
|
||
/* Allow language dialects to perform special processing. */
|
||
if (lang_expand_function_end)
|
||
(*lang_expand_function_end) ();
|
||
|
||
/* Generate rtl for function exit. */
|
||
expand_function_end (input_filename, lineno, 0);
|
||
|
||
/* If this is a nested function, protect the local variables in the stack
|
||
above us from being collected while we're compiling this function. */
|
||
if (nested_p)
|
||
ggc_push_context ();
|
||
|
||
/* Run the optimizers and output the assembler code for this function. */
|
||
rest_of_compilation (fndecl);
|
||
|
||
/* Undo the GC context switch. */
|
||
if (nested_p)
|
||
ggc_pop_context ();
|
||
|
||
/* With just -W, complain only if function returns both with
|
||
and without a value. */
|
||
if (extra_warnings
|
||
&& current_function_returns_value
|
||
&& current_function_returns_null)
|
||
warning ("this function may return with or without a value");
|
||
|
||
/* If requested, warn about function definitions where the function will
|
||
return a value (usually of some struct or union type) which itself will
|
||
take up a lot of stack space. */
|
||
|
||
if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
|
||
{
|
||
tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
|
||
|
||
if (ret_type && TYPE_SIZE_UNIT (ret_type)
|
||
&& TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
|
||
&& 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
|
||
larger_than_size))
|
||
{
|
||
unsigned int size_as_int
|
||
= TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
|
||
|
||
if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
|
||
warning_with_decl (fndecl,
|
||
"size of return value of `%s' is %u bytes",
|
||
size_as_int);
|
||
else
|
||
warning_with_decl (fndecl,
|
||
"size of return value of `%s' is larger than %d bytes",
|
||
larger_than_size);
|
||
}
|
||
}
|
||
|
||
if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
|
||
&& ! flag_inline_trees)
|
||
{
|
||
/* Stop pointing to the local nodes about to be freed.
|
||
But DECL_INITIAL must remain nonzero so we know this
|
||
was an actual function definition.
|
||
For a nested function, this is done in c_pop_function_context.
|
||
If rest_of_compilation set this to 0, leave it 0. */
|
||
if (DECL_INITIAL (fndecl) != 0)
|
||
DECL_INITIAL (fndecl) = error_mark_node;
|
||
|
||
DECL_ARGUMENTS (fndecl) = 0;
|
||
}
|
||
|
||
if (DECL_STATIC_CONSTRUCTOR (fndecl))
|
||
{
|
||
if (targetm.have_ctors_dtors)
|
||
(* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
|
||
DEFAULT_INIT_PRIORITY);
|
||
else
|
||
static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
|
||
}
|
||
|
||
if (DECL_STATIC_DESTRUCTOR (fndecl))
|
||
{
|
||
if (targetm.have_ctors_dtors)
|
||
(* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
|
||
DEFAULT_INIT_PRIORITY);
|
||
else
|
||
static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
|
||
}
|
||
|
||
if (nested_p)
|
||
/* Return to the enclosing function. */
|
||
pop_function_context ();
|
||
timevar_pop (TV_EXPAND);
|
||
|
||
lineno = saved_lineno;
|
||
input_filename = saved_input_filename;
|
||
}
|
||
|
||
/* Check the declarations given in a for-loop for satisfying the C99
|
||
constraints. */
|
||
void
|
||
check_for_loop_decls ()
|
||
{
|
||
tree t;
|
||
|
||
if (!flag_isoc99)
|
||
{
|
||
/* If we get here, declarations have been used in a for loop without
|
||
the C99 for loop scope. This doesn't make much sense, so don't
|
||
allow it. */
|
||
error ("`for' loop initial declaration used outside C99 mode");
|
||
return;
|
||
}
|
||
/* C99 subclause 6.8.5 paragraph 3:
|
||
|
||
[#3] The declaration part of a for statement shall only
|
||
declare identifiers for objects having storage class auto or
|
||
register.
|
||
|
||
It isn't clear whether, in this sentence, "identifiers" binds to
|
||
"shall only declare" or to "objects" - that is, whether all identifiers
|
||
declared must be identifiers for objects, or whether the restriction
|
||
only applies to those that are. (A question on this in comp.std.c
|
||
in November 2000 received no answer.) We implement the strictest
|
||
interpretation, to avoid creating an extension which later causes
|
||
problems. */
|
||
|
||
for (t = gettags (); t; t = TREE_CHAIN (t))
|
||
{
|
||
if (TREE_PURPOSE (t) != 0)
|
||
{
|
||
enum tree_code code = TREE_CODE (TREE_VALUE (t));
|
||
|
||
if (code == RECORD_TYPE)
|
||
error ("`struct %s' declared in `for' loop initial declaration",
|
||
IDENTIFIER_POINTER (TREE_PURPOSE (t)));
|
||
else if (code == UNION_TYPE)
|
||
error ("`union %s' declared in `for' loop initial declaration",
|
||
IDENTIFIER_POINTER (TREE_PURPOSE (t)));
|
||
else
|
||
error ("`enum %s' declared in `for' loop initial declaration",
|
||
IDENTIFIER_POINTER (TREE_PURPOSE (t)));
|
||
}
|
||
}
|
||
|
||
for (t = getdecls (); t; t = TREE_CHAIN (t))
|
||
{
|
||
if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
|
||
error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
|
||
else if (TREE_STATIC (t))
|
||
error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
|
||
else if (DECL_EXTERNAL (t))
|
||
error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
|
||
}
|
||
}
|
||
|
||
/* Save and restore the variables in this file and elsewhere
|
||
that keep track of the progress of compilation of the current function.
|
||
Used for nested functions. */
|
||
|
||
struct language_function GTY(())
|
||
{
|
||
struct c_language_function base;
|
||
tree named_labels;
|
||
tree shadowed_labels;
|
||
int returns_value;
|
||
int returns_null;
|
||
int returns_abnormally;
|
||
int warn_about_return_type;
|
||
int extern_inline;
|
||
struct binding_level *binding_level;
|
||
};
|
||
|
||
/* Save and reinitialize the variables
|
||
used during compilation of a C function. */
|
||
|
||
void
|
||
c_push_function_context (f)
|
||
struct function *f;
|
||
{
|
||
struct language_function *p;
|
||
p = ((struct language_function *)
|
||
ggc_alloc (sizeof (struct language_function)));
|
||
f->language = p;
|
||
|
||
p->base.x_stmt_tree = c_stmt_tree;
|
||
p->base.x_scope_stmt_stack = c_scope_stmt_stack;
|
||
p->named_labels = named_labels;
|
||
p->shadowed_labels = shadowed_labels;
|
||
p->returns_value = current_function_returns_value;
|
||
p->returns_null = current_function_returns_null;
|
||
p->returns_abnormally = current_function_returns_abnormally;
|
||
p->warn_about_return_type = warn_about_return_type;
|
||
p->extern_inline = current_extern_inline;
|
||
p->binding_level = current_binding_level;
|
||
}
|
||
|
||
/* Restore the variables used during compilation of a C function. */
|
||
|
||
void
|
||
c_pop_function_context (f)
|
||
struct function *f;
|
||
{
|
||
struct language_function *p = f->language;
|
||
tree link;
|
||
|
||
/* Bring back all the labels that were shadowed. */
|
||
for (link = shadowed_labels; link; link = TREE_CHAIN (link))
|
||
if (DECL_NAME (TREE_VALUE (link)) != 0)
|
||
IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
|
||
= TREE_VALUE (link);
|
||
|
||
if (DECL_SAVED_INSNS (current_function_decl) == 0
|
||
&& DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
|
||
{
|
||
/* Stop pointing to the local nodes about to be freed. */
|
||
/* But DECL_INITIAL must remain nonzero so we know this
|
||
was an actual function definition. */
|
||
DECL_INITIAL (current_function_decl) = error_mark_node;
|
||
DECL_ARGUMENTS (current_function_decl) = 0;
|
||
}
|
||
|
||
c_stmt_tree = p->base.x_stmt_tree;
|
||
c_scope_stmt_stack = p->base.x_scope_stmt_stack;
|
||
named_labels = p->named_labels;
|
||
shadowed_labels = p->shadowed_labels;
|
||
current_function_returns_value = p->returns_value;
|
||
current_function_returns_null = p->returns_null;
|
||
current_function_returns_abnormally = p->returns_abnormally;
|
||
warn_about_return_type = p->warn_about_return_type;
|
||
current_extern_inline = p->extern_inline;
|
||
current_binding_level = p->binding_level;
|
||
|
||
f->language = NULL;
|
||
}
|
||
|
||
/* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
|
||
|
||
void
|
||
c_dup_lang_specific_decl (decl)
|
||
tree decl;
|
||
{
|
||
struct lang_decl *ld;
|
||
|
||
if (!DECL_LANG_SPECIFIC (decl))
|
||
return;
|
||
|
||
ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
|
||
memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
|
||
sizeof (struct lang_decl));
|
||
DECL_LANG_SPECIFIC (decl) = ld;
|
||
}
|
||
|
||
/* The functions below are required for functionality of doing
|
||
function at once processing in the C front end. Currently these
|
||
functions are not called from anywhere in the C front end, but as
|
||
these changes continue, that will change. */
|
||
|
||
/* Returns nonzero if the current statement is a full expression,
|
||
i.e. temporaries created during that statement should be destroyed
|
||
at the end of the statement. */
|
||
|
||
int
|
||
stmts_are_full_exprs_p ()
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
/* Returns the stmt_tree (if any) to which statements are currently
|
||
being added. If there is no active statement-tree, NULL is
|
||
returned. */
|
||
|
||
stmt_tree
|
||
current_stmt_tree ()
|
||
{
|
||
return &c_stmt_tree;
|
||
}
|
||
|
||
/* Returns the stack of SCOPE_STMTs for the current function. */
|
||
|
||
tree *
|
||
current_scope_stmt_stack ()
|
||
{
|
||
return &c_scope_stmt_stack;
|
||
}
|
||
|
||
/* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
|
||
C. */
|
||
|
||
int
|
||
anon_aggr_type_p (node)
|
||
tree node ATTRIBUTE_UNUSED;
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
/* Dummy function in place of callback used by C++. */
|
||
|
||
void
|
||
extract_interface_info ()
|
||
{
|
||
}
|
||
|
||
/* Return a new COMPOUND_STMT, after adding it to the current
|
||
statement tree. */
|
||
|
||
tree
|
||
c_begin_compound_stmt ()
|
||
{
|
||
tree stmt;
|
||
|
||
/* Create the COMPOUND_STMT. */
|
||
stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
|
||
|
||
return stmt;
|
||
}
|
||
|
||
/* Expand T (a DECL_STMT) if it declares an entity not handled by the
|
||
common code. */
|
||
|
||
void
|
||
c_expand_decl_stmt (t)
|
||
tree t;
|
||
{
|
||
tree decl = DECL_STMT_DECL (t);
|
||
|
||
/* Expand nested functions. */
|
||
if (TREE_CODE (decl) == FUNCTION_DECL
|
||
&& DECL_CONTEXT (decl) == current_function_decl
|
||
&& DECL_SAVED_TREE (decl))
|
||
c_expand_body (decl, /*nested_p=*/1, /*can_defer_p=*/0);
|
||
}
|
||
|
||
/* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
|
||
the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
|
||
|
||
tree
|
||
identifier_global_value (t)
|
||
tree t;
|
||
{
|
||
return IDENTIFIER_GLOBAL_VALUE (t);
|
||
}
|
||
|
||
/* Record a builtin type for C. If NAME is non-NULL, it is the name used;
|
||
otherwise the name is found in ridpointers from RID_INDEX. */
|
||
|
||
void
|
||
record_builtin_type (rid_index, name, type)
|
||
enum rid rid_index;
|
||
const char *name;
|
||
tree type;
|
||
{
|
||
tree id;
|
||
if (name == 0)
|
||
id = ridpointers[(int) rid_index];
|
||
else
|
||
id = get_identifier (name);
|
||
pushdecl (build_decl (TYPE_DECL, id, type));
|
||
}
|
||
|
||
/* Build the void_list_node (void_type_node having been created). */
|
||
tree
|
||
build_void_list_node ()
|
||
{
|
||
tree t = build_tree_list (NULL_TREE, void_type_node);
|
||
return t;
|
||
}
|
||
|
||
/* Return something to represent absolute declarators containing a *.
|
||
TARGET is the absolute declarator that the * contains.
|
||
TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
|
||
to apply to the pointer type, represented as identifiers, possible mixed
|
||
with attributes.
|
||
|
||
We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
|
||
if attributes are present) and whose type is the modifier list. */
|
||
|
||
tree
|
||
make_pointer_declarator (type_quals_attrs, target)
|
||
tree type_quals_attrs, target;
|
||
{
|
||
tree quals, attrs;
|
||
tree itarget = target;
|
||
split_specs_attrs (type_quals_attrs, &quals, &attrs);
|
||
if (attrs != NULL_TREE)
|
||
itarget = tree_cons (attrs, target, NULL_TREE);
|
||
return build1 (INDIRECT_REF, quals, itarget);
|
||
}
|
||
|
||
#include "gt-c-decl.h"
|