freebsd-dev/contrib/gcc/c-objc-common.c

405 lines
9.7 KiB
C

/* Some code common to C and ObjC front ends.
Copyright (C) 2001 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. */
#include "config.h"
#include "system.h"
#include "tree.h"
#include "rtl.h"
#include "insn-config.h"
#include "integrate.h"
#include "expr.h"
#include "c-tree.h"
#include "function.h"
#include "flags.h"
#include "toplev.h"
#include "diagnostic.h"
#include "tree-inline.h"
#include "varray.h"
#include "ggc.h"
static int c_tree_printer PARAMS ((output_buffer *));
static tree inline_forbidden_p PARAMS ((tree *, int *, void *));
static void expand_deferred_fns PARAMS ((void));
static tree start_cdtor PARAMS ((int));
static void finish_cdtor PARAMS ((tree));
static varray_type deferred_fns;
int
c_missing_noreturn_ok_p (decl)
tree decl;
{
/* A missing noreturn is not ok for freestanding implementations and
ok for the `main' function in hosted implementations. */
return flag_hosted && MAIN_NAME_P (DECL_ASSEMBLER_NAME (decl));
}
/* We want to inline `extern inline' functions even if this would
violate inlining limits. Some glibc and linux constructs depend on
such functions always being inlined when optimizing. */
int
c_disregard_inline_limits (fn)
tree fn;
{
if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) != NULL)
return 1;
return DECL_DECLARED_INLINE_P (fn) && DECL_EXTERNAL (fn);
}
static tree
inline_forbidden_p (nodep, walk_subtrees, fn)
tree *nodep;
int *walk_subtrees ATTRIBUTE_UNUSED;
void *fn;
{
tree node = *nodep;
tree t;
switch (TREE_CODE (node))
{
case CALL_EXPR:
t = get_callee_fndecl (node);
if (! t)
break;
/* We cannot inline functions that call setjmp. */
if (setjmp_call_p (t))
return node;
switch (DECL_FUNCTION_CODE (t))
{
/* We cannot inline functions that take a variable number of
arguments. */
case BUILT_IN_VARARGS_START:
case BUILT_IN_STDARG_START:
#if 0
/* Functions that need information about the address of the
caller can't (shouldn't?) be inlined. */
case BUILT_IN_RETURN_ADDRESS:
#endif
return node;
default:
break;
}
break;
case DECL_STMT:
/* We cannot inline functions that contain other functions. */
if (TREE_CODE (TREE_OPERAND (node, 0)) == FUNCTION_DECL
&& DECL_INITIAL (TREE_OPERAND (node, 0)))
return node;
break;
case GOTO_STMT:
case GOTO_EXPR:
t = TREE_OPERAND (node, 0);
/* We will not inline a function which uses computed goto. The
addresses of its local labels, which may be tucked into
global storage, are of course not constant across
instantiations, which causes unexpected behaviour. */
if (TREE_CODE (t) != LABEL_DECL)
return node;
/* We cannot inline a nested function that jumps to a nonlocal
label. */
if (TREE_CODE (t) == LABEL_DECL
&& DECL_CONTEXT (t) && DECL_CONTEXT (t) != fn)
return node;
break;
default:
break;
}
return NULL_TREE;
}
int
c_cannot_inline_tree_fn (fnp)
tree *fnp;
{
tree fn = *fnp;
tree t;
if (flag_really_no_inline
&& lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) == NULL)
return 1;
if (! function_attribute_inlinable_p (fn))
{
DECL_UNINLINABLE (fn) = 1;
return 1;
}
/* If a function has pending sizes, we must not defer its
compilation, and we can't inline it as a tree. */
if (fn == current_function_decl)
{
t = get_pending_sizes ();
put_pending_sizes (t);
if (t)
{
DECL_UNINLINABLE (fn) = 1;
return 1;
}
}
if (DECL_CONTEXT (fn))
{
/* If a nested function has pending sizes, we may have already
saved them. */
if (DECL_LANG_SPECIFIC (fn)->pending_sizes)
{
DECL_UNINLINABLE (fn) = 1;
return 1;
}
}
else
{
/* We rely on the fact that this function is called upfront,
just before we start expanding a function. If FN is active
(i.e., it's the current_function_decl or a parent thereof),
we have to walk FN's saved tree. Otherwise, we can safely
assume we have done it before and, if we didn't mark it as
uninlinable (in which case we wouldn't have been called), it
is inlinable. Unfortunately, this strategy doesn't work for
nested functions, because they're only expanded as part of
their enclosing functions, so the inlinability test comes in
late. */
t = current_function_decl;
while (t && t != fn)
t = DECL_CONTEXT (t);
if (! t)
return 0;
}
if (walk_tree (&DECL_SAVED_TREE (fn), inline_forbidden_p, fn, NULL))
{
DECL_UNINLINABLE (fn) = 1;
return 1;
}
return 0;
}
/* Initialization common to C and Objective-C front ends. */
const char *
c_objc_common_init (filename)
const char *filename;
{
c_init_decl_processing ();
filename = c_common_init (filename);
add_c_tree_codes ();
save_lang_status = &push_c_function_context;
restore_lang_status = &pop_c_function_context;
mark_lang_status = &mark_c_function_context;
lang_expand_expr = c_expand_expr;
lang_expand_decl_stmt = c_expand_decl_stmt;
/* These were not defined in the Objective-C front end, but I'm
putting them here anyway. The diagnostic format decoder might
want an enhanced ObjC implementation. */
diagnostic_format_decoder (global_dc) = &c_tree_printer;
lang_missing_noreturn_ok_p = &c_missing_noreturn_ok_p;
/* If still unspecified, make it match -std=c99
(allowing for -pedantic-errors). */
if (mesg_implicit_function_declaration < 0)
{
if (flag_isoc99)
mesg_implicit_function_declaration = flag_pedantic_errors ? 2 : 1;
else
mesg_implicit_function_declaration = 0;
}
VARRAY_TREE_INIT (deferred_fns, 32, "deferred_fns");
ggc_add_tree_varray_root (&deferred_fns, 1);
return filename;
}
/* Register a function tree, so that its optimization and conversion
to RTL is only done at the end of the compilation. */
int
defer_fn (fn)
tree fn;
{
VARRAY_PUSH_TREE (deferred_fns, fn);
return 1;
}
/* Expand deferred functions for C and ObjC. */
static void
expand_deferred_fns ()
{
unsigned int i;
for (i = 0; i < VARRAY_ACTIVE_SIZE (deferred_fns); i++)
{
tree decl = VARRAY_TREE (deferred_fns, i);
if (! TREE_ASM_WRITTEN (decl))
{
/* For static inline functions, delay the decision whether to
emit them or not until wrapup_global_declarations. */
if (! TREE_PUBLIC (decl))
DECL_DEFER_OUTPUT (decl) = 1;
c_expand_deferred_function (decl);
}
}
VARRAY_FREE (deferred_fns);
}
static tree
start_cdtor (method_type)
int method_type;
{
tree fnname = get_file_function_name (method_type);
tree void_list_node_1 = build_tree_list (NULL_TREE, void_type_node);
tree body;
start_function (void_list_node_1,
build_nt (CALL_EXPR, fnname,
tree_cons (NULL_TREE, NULL_TREE, void_list_node_1),
NULL_TREE),
NULL_TREE);
store_parm_decls ();
current_function_cannot_inline
= "static constructors and destructors cannot be inlined";
body = c_begin_compound_stmt ();
pushlevel (0);
clear_last_expr ();
add_scope_stmt (/*begin_p=*/1, /*partial_p=*/0);
return body;
}
static void
finish_cdtor (body)
tree body;
{
tree scope;
tree block;
scope = add_scope_stmt (/*begin_p=*/0, /*partial_p=*/0);
block = poplevel (0, 0, 0);
SCOPE_STMT_BLOCK (TREE_PURPOSE (scope)) = block;
SCOPE_STMT_BLOCK (TREE_VALUE (scope)) = block;
RECHAIN_STMTS (body, COMPOUND_BODY (body));
finish_function (0, 0);
}
/* Called at end of parsing, but before end-of-file processing. */
void
c_objc_common_finish_file ()
{
expand_deferred_fns ();
if (static_ctors)
{
tree body = start_cdtor ('I');
for (; static_ctors; static_ctors = TREE_CHAIN (static_ctors))
c_expand_expr_stmt (build_function_call (TREE_VALUE (static_ctors),
NULL_TREE));
finish_cdtor (body);
}
if (static_dtors)
{
tree body = start_cdtor ('D');
for (; static_dtors; static_dtors = TREE_CHAIN (static_dtors))
c_expand_expr_stmt (build_function_call (TREE_VALUE (static_dtors),
NULL_TREE));
finish_cdtor (body);
}
{
int flags;
FILE *stream = dump_begin (TDI_all, &flags);
if (stream)
{
dump_node (getdecls (), flags & ~TDF_SLIM, stream);
dump_end (TDI_all, stream);
}
}
}
/* Called during diagnostic message formatting process to print a
source-level entity onto BUFFER. The meaning of the format specifiers
is as follows:
%D: a general decl,
%F: a function declaration,
%T: a type.
These format specifiers form a subset of the format specifiers set used
by the C++ front-end.
Please notice when called, the `%' part was already skipped by the
diagnostic machinery. */
static int
c_tree_printer (buffer)
output_buffer *buffer;
{
tree t = va_arg (output_buffer_format_args (buffer), tree);
switch (*output_buffer_text_cursor (buffer))
{
case 'D':
case 'F':
case 'T':
{
const char *n = DECL_NAME (t)
? (*decl_printable_name) (t, 2)
: "({anonymous})";
output_add_string (buffer, n);
}
return 1;
default:
return 0;
}
}