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freebsd-skq/contrib/gcc/cp/class.c
Peter Wemm a4cd5630b0 Import of unmodified (but trimmed) gcc-2.7.2. The bigger parts of the 
non-i386, non-unix, and generatable files have been trimmed, but can easily
be added in later if needed.

gcc-2.7.2.1 will follow shortly, it's a very small delta to this and it's
handy to have both available for reference for such little cost.

The freebsd-specific changes will then be committed, and once the dust has
settled, the bmakefiles will be committed to use this code.
1996-09-18 05:35:50 +00:00

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/* Functions related to building classes and their related objects.
Copyright (C) 1987, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
Contributed by Michael Tiemann (tiemann@cygnus.com)
This file is part of GNU CC.
GNU CC 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.
GNU CC 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 GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* High-level class interface. */
#include "config.h"
#include "tree.h"
#include <stdio.h>
#include "cp-tree.h"
#include "flags.h"
#include "rtl.h"
#include "output.h"
#include "obstack.h"
#define obstack_chunk_alloc xmalloc
#define obstack_chunk_free free
extern struct obstack permanent_obstack;
/* This is how we tell when two virtual member functions are really the
same. */
#define SAME_FN(FN1DECL, FN2DECL) (DECL_ASSEMBLER_NAME (FN1DECL) == DECL_ASSEMBLER_NAME (FN2DECL))
extern void set_class_shadows PROTO ((tree));
/* Way of stacking class types. */
static tree *current_class_base, *current_class_stack;
static int current_class_stacksize;
int current_class_depth;
struct class_level
{
/* The previous class level. */
struct class_level *level_chain;
/* The class instance variable, as a PARM_DECL. */
tree decl;
/* The class instance variable, as an object. */
tree object;
/* The virtual function table pointer
for the class instance variable. */
tree vtable_decl;
/* Name of the current class. */
tree name;
/* Type of the current class. */
tree type;
/* Flags for this class level. */
int this_is_variable;
int memoized_lookups;
int save_memoized;
int unused;
};
tree current_class_decl, C_C_D; /* PARM_DECL: the class instance variable */
/* The following two can be derived from the previous one */
tree current_class_name; /* IDENTIFIER_NODE: name of current class */
tree current_class_type; /* _TYPE: the type of the current class */
tree previous_class_type; /* _TYPE: the previous type that was a class */
tree previous_class_values; /* TREE_LIST: copy of the class_shadowed list
when leaving an outermost class scope. */
static tree get_vfield_name PROTO((tree));
tree the_null_vtable_entry;
/* Way of stacking language names. */
tree *current_lang_base, *current_lang_stack;
int current_lang_stacksize;
/* Names of languages we recognize. */
tree lang_name_c, lang_name_cplusplus;
tree current_lang_name;
char *dont_allow_type_definitions;
/* When layout out an aggregate type, the size of the
basetypes (virtual and non-virtual) is passed to layout_record
via this node. */
static tree base_layout_decl;
/* Variables shared between class.c and call.c. */
int n_vtables = 0;
int n_vtable_entries = 0;
int n_vtable_searches = 0;
int n_vtable_elems = 0;
int n_convert_harshness = 0;
int n_compute_conversion_costs = 0;
int n_build_method_call = 0;
int n_inner_fields_searched = 0;
/* Virtual baseclass things. */
tree
build_vbase_pointer (exp, type)
tree exp, type;
{
char *name;
name = (char *) alloca (TYPE_NAME_LENGTH (type) + sizeof (VBASE_NAME) + 1);
sprintf (name, VBASE_NAME_FORMAT, TYPE_NAME_STRING (type));
return build_component_ref (exp, get_identifier (name), 0, 0);
}
/* Is the type of the EXPR, the complete type of the object?
If we are going to be wrong, we must be conservative, and return 0. */
int
complete_type_p (expr)
tree expr;
{
tree type = TYPE_MAIN_VARIANT (TREE_TYPE (expr));
while (1)
{
switch (TREE_CODE (expr))
{
case SAVE_EXPR:
case INDIRECT_REF:
case ADDR_EXPR:
case NOP_EXPR:
case CONVERT_EXPR:
expr = TREE_OPERAND (expr, 0);
continue;
case CALL_EXPR:
if (! TREE_HAS_CONSTRUCTOR (expr))
break;
/* fall through... */
case VAR_DECL:
case FIELD_DECL:
if (TREE_CODE (TREE_TYPE (expr)) == ARRAY_TYPE
&& IS_AGGR_TYPE (TREE_TYPE (TREE_TYPE (expr)))
&& TYPE_MAIN_VARIANT (TREE_TYPE (expr)) == type)
return 1;
/* fall through... */
case TARGET_EXPR:
case PARM_DECL:
if (IS_AGGR_TYPE (TREE_TYPE (expr))
&& TYPE_MAIN_VARIANT (TREE_TYPE (expr)) == type)
return 1;
/* fall through... */
case PLUS_EXPR:
default:
break;
}
break;
}
return 0;
}
/* Build multi-level access to EXPR using hierarchy path PATH.
CODE is PLUS_EXPR if we are going with the grain,
and MINUS_EXPR if we are not (in which case, we cannot traverse
virtual baseclass links).
TYPE is the type we want this path to have on exit.
ALIAS_THIS is non-zero if EXPR in an expression involving `this'. */
tree
build_vbase_path (code, type, expr, path, alias_this)
enum tree_code code;
tree type, expr, path;
int alias_this;
{
register int changed = 0;
tree last = NULL_TREE, last_virtual = NULL_TREE;
int nonnull = 0;
int fixed_type_p = resolves_to_fixed_type_p (expr, &nonnull);
tree null_expr = 0, nonnull_expr;
tree basetype;
tree offset = integer_zero_node;
if (nonnull == 0 && (alias_this && flag_this_is_variable <= 0))
nonnull = 1;
/* We need additional logic to convert back to the unconverted type
(the static type of the complete object), and then convert back
to the type we want. Until that is done, or until we can
recognize when that is, we cannot do the short cut logic. (mrs) */
/* Do this, until we can undo any previous conversions. See net35.C
for a testcase. */
fixed_type_p = complete_type_p (expr);
if (!fixed_type_p && TREE_SIDE_EFFECTS (expr))
expr = save_expr (expr);
nonnull_expr = expr;
if (BINFO_INHERITANCE_CHAIN (path))
{
tree reverse_path = NULL_TREE;
while (path)
{
tree r = copy_node (path);
BINFO_INHERITANCE_CHAIN (r) = reverse_path;
reverse_path = r;
path = BINFO_INHERITANCE_CHAIN (path);
}
path = reverse_path;
}
basetype = BINFO_TYPE (path);
while (path)
{
if (TREE_VIA_VIRTUAL (path))
{
last_virtual = BINFO_TYPE (path);
if (code == PLUS_EXPR)
{
changed = ! fixed_type_p;
if (changed)
{
extern int flag_assume_nonnull_objects;
tree ind;
/* We already check for ambiguous things in the caller, just
find a path. */
if (last)
{
tree binfo = get_binfo (last, TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (nonnull_expr))), 0);
nonnull_expr = convert_pointer_to_real (binfo, nonnull_expr);
}
ind = build_indirect_ref (nonnull_expr, NULL_PTR);
nonnull_expr = build_vbase_pointer (ind, last_virtual);
if (nonnull == 0
&& (TREE_CODE (type) == POINTER_TYPE
|| !flag_assume_nonnull_objects)
&& null_expr == NULL_TREE)
{
null_expr = build1 (NOP_EXPR, build_pointer_type (last_virtual), integer_zero_node);
expr = build (COND_EXPR, build_pointer_type (last_virtual),
build (EQ_EXPR, boolean_type_node, expr,
integer_zero_node),
null_expr, nonnull_expr);
}
}
/* else we'll figure out the offset below. */
/* Happens in the case of parse errors. */
if (nonnull_expr == error_mark_node)
return error_mark_node;
}
else
{
cp_error ("cannot cast up from virtual baseclass `%T'",
last_virtual);
return error_mark_node;
}
}
last = path;
path = BINFO_INHERITANCE_CHAIN (path);
}
/* LAST is now the last basetype assoc on the path. */
/* A pointer to a virtual base member of a non-null object
is non-null. Therefore, we only need to test for zeroness once.
Make EXPR the canonical expression to deal with here. */
if (null_expr)
{
TREE_OPERAND (expr, 2) = nonnull_expr;
TREE_TYPE (TREE_OPERAND (expr, 1)) = TREE_TYPE (nonnull_expr);
}
else
expr = nonnull_expr;
/* If we go through any virtual base pointers, make sure that
casts to BASETYPE from the last virtual base class use
the right value for BASETYPE. */
if (changed)
{
tree intype = TREE_TYPE (TREE_TYPE (expr));
if (TYPE_MAIN_VARIANT (intype) != BINFO_TYPE (last))
{
tree binfo = get_binfo (last, TYPE_MAIN_VARIANT (intype), 0);
offset = BINFO_OFFSET (binfo);
}
}
else
{
if (last_virtual)
{
offset = BINFO_OFFSET (binfo_member (last_virtual,
CLASSTYPE_VBASECLASSES (basetype)));
offset = size_binop (PLUS_EXPR, offset, BINFO_OFFSET (last));
}
else
offset = BINFO_OFFSET (last);
}
if (TREE_INT_CST_LOW (offset))
{
/* Bash types to make the backend happy. */
offset = convert (type, offset);
expr = build1 (NOP_EXPR, type, expr);
/* For multiple inheritance: if `this' can be set by any
function, then it could be 0 on entry to any function.
Preserve such zeroness here. Otherwise, only in the
case of constructors need we worry, and in those cases,
it will be zero, or initialized to some valid value to
which we may add. */
if (nonnull == 0)
{
if (null_expr)
TREE_TYPE (null_expr) = type;
else
null_expr = build1 (NOP_EXPR, type, integer_zero_node);
if (TREE_SIDE_EFFECTS (expr))
expr = save_expr (expr);
return build (COND_EXPR, type,
build (EQ_EXPR, boolean_type_node, expr, integer_zero_node),
null_expr,
build (code, type, expr, offset));
}
else return build (code, type, expr, offset);
}
/* Cannot change the TREE_TYPE of a NOP_EXPR here, since it may
be used multiple times in initialization of multiple inheritance. */
if (null_expr)
{
TREE_TYPE (expr) = type;
return expr;
}
else
return build1 (NOP_EXPR, type, expr);
}
/* Virtual function things. */
/* Virtual functions to be dealt with after laying out our base
classes. We do all overrides after we layout virtual base classes.
*/
static tree pending_hard_virtuals;
static int doing_hard_virtuals;
/* Build an entry in the virtual function table.
DELTA is the offset for the `this' pointer.
PFN is an ADDR_EXPR containing a pointer to the virtual function.
Note that the index (DELTA2) in the virtual function table
is always 0. */
tree
build_vtable_entry (delta, pfn)
tree delta, pfn;
{
if (flag_vtable_thunks)
{
HOST_WIDE_INT idelta = TREE_INT_CST_LOW (delta);
extern tree make_thunk ();
if (idelta)
{
pfn = build1 (ADDR_EXPR, vtable_entry_type,
make_thunk (pfn, idelta));
TREE_READONLY (pfn) = 1;
TREE_CONSTANT (pfn) = 1;
}
#ifdef GATHER_STATISTICS
n_vtable_entries += 1;
#endif
return pfn;
}
else
{
extern int flag_huge_objects;
tree elems = tree_cons (NULL_TREE, delta,
tree_cons (NULL_TREE, integer_zero_node,
build_tree_list (NULL_TREE, pfn)));
tree entry = build (CONSTRUCTOR, vtable_entry_type, NULL_TREE, elems);
/* DELTA is constructed by `size_int', which means it may be an
unsigned quantity on some platforms. Therefore, we cannot use
`int_fits_type_p', because when DELTA is really negative,
`force_fit_type' will make it look like a very large number. */
if ((TREE_INT_CST_LOW (TYPE_MAX_VALUE (delta_type_node))
< TREE_INT_CST_LOW (delta))
|| (TREE_INT_CST_LOW (delta)
< TREE_INT_CST_LOW (TYPE_MIN_VALUE (delta_type_node))))
if (flag_huge_objects)
sorry ("object size exceeds built-in limit for virtual function table implementation");
else
sorry ("object size exceeds normal limit for virtual function table implementation, recompile all source and use -fhuge-objects");
TREE_CONSTANT (entry) = 1;
TREE_STATIC (entry) = 1;
TREE_READONLY (entry) = 1;
#ifdef GATHER_STATISTICS
n_vtable_entries += 1;
#endif
return entry;
}
}
/* Given an object INSTANCE, return an expression which yields the
virtual function corresponding to INDEX. There are many special
cases for INSTANCE which we take care of here, mainly to avoid
creating extra tree nodes when we don't have to. */
tree
build_vfn_ref (ptr_to_instptr, instance, idx)
tree *ptr_to_instptr, instance;
tree idx;
{
extern int building_cleanup;
tree vtbl, aref;
tree basetype = TREE_TYPE (instance);
if (TREE_CODE (basetype) == REFERENCE_TYPE)
basetype = TREE_TYPE (basetype);
if (instance == C_C_D)
vtbl = build_indirect_ref (build_vfield_ref (instance, basetype),
NULL_PTR);
else
{
if (optimize)
{
/* Try to figure out what a reference refers to, and
access its virtual function table directly. */
tree ref = NULL_TREE;
if (TREE_CODE (instance) == INDIRECT_REF
&& TREE_CODE (TREE_TYPE (TREE_OPERAND (instance, 0))) == REFERENCE_TYPE)
ref = TREE_OPERAND (instance, 0);
else if (TREE_CODE (TREE_TYPE (instance)) == REFERENCE_TYPE)
ref = instance;
if (ref && TREE_CODE (ref) == VAR_DECL
&& DECL_INITIAL (ref))
{
tree init = DECL_INITIAL (ref);
while (TREE_CODE (init) == NOP_EXPR
|| TREE_CODE (init) == NON_LVALUE_EXPR)
init = TREE_OPERAND (init, 0);
if (TREE_CODE (init) == ADDR_EXPR)
{
init = TREE_OPERAND (init, 0);
if (IS_AGGR_TYPE (TREE_TYPE (init))
&& (TREE_CODE (init) == PARM_DECL
|| TREE_CODE (init) == VAR_DECL))
instance = init;
}
}
}
if (IS_AGGR_TYPE (TREE_TYPE (instance))
&& (TREE_CODE (instance) == RESULT_DECL
|| TREE_CODE (instance) == PARM_DECL
|| TREE_CODE (instance) == VAR_DECL))
vtbl = TYPE_BINFO_VTABLE (basetype);
else
vtbl = build_indirect_ref (build_vfield_ref (instance, basetype),
NULL_PTR);
}
assemble_external (vtbl);
aref = build_array_ref (vtbl, idx);
/* Save the intermediate result in a SAVE_EXPR so we don't have to
compute each component of the virtual function pointer twice. */
if (!building_cleanup && TREE_CODE (aref) == INDIRECT_REF)
TREE_OPERAND (aref, 0) = save_expr (TREE_OPERAND (aref, 0));
if (flag_vtable_thunks)
return aref;
else
{
if (ptr_to_instptr)
*ptr_to_instptr
= build (PLUS_EXPR, TREE_TYPE (*ptr_to_instptr),
*ptr_to_instptr,
convert (ptrdiff_type_node,
build_component_ref (aref, delta_identifier, 0, 0)));
return build_component_ref (aref, pfn_identifier, 0, 0);
}
}
/* Return the name of the virtual function table (as an IDENTIFIER_NODE)
for the given TYPE. */
static tree
get_vtable_name (type)
tree type;
{
tree type_id = build_typename_overload (type);
char *buf = (char *)alloca (strlen (VTABLE_NAME_FORMAT)
+ IDENTIFIER_LENGTH (type_id) + 2);
char *ptr = IDENTIFIER_POINTER (type_id);
int i;
for (i = 0; ptr[i] == OPERATOR_TYPENAME_FORMAT[i]; i++) ;
#if 0
/* We don't take off the numbers; prepare_fresh_vtable uses the
DECL_ASSEMBLER_NAME for the type, which includes the number
in `3foo'. If we were to pull them off here, we'd end up with
something like `_vt.foo.3bar', instead of a uniform definition. */
while (ptr[i] >= '0' && ptr[i] <= '9')
i += 1;
#endif
sprintf (buf, VTABLE_NAME_FORMAT, ptr+i);
return get_identifier (buf);
}
/* Build a virtual function for type TYPE.
If BINFO is non-NULL, build the vtable starting with the initial
approximation that it is the same as the one which is the head of
the association list. */
static tree
build_vtable (binfo, type)
tree binfo, type;
{
tree name = get_vtable_name (type);
tree virtuals, decl;
if (binfo)
{
virtuals = copy_list (BINFO_VIRTUALS (binfo));
decl = build_decl (VAR_DECL, name, TREE_TYPE (BINFO_VTABLE (binfo)));
}
else
{
virtuals = NULL_TREE;
decl = build_decl (VAR_DECL, name, void_type_node);
}
#ifdef GATHER_STATISTICS
n_vtables += 1;
n_vtable_elems += list_length (virtuals);
#endif
/* Set TREE_PUBLIC and TREE_EXTERN as appropriate. */
import_export_vtable (decl, type, 0);
IDENTIFIER_GLOBAL_VALUE (name) = decl = pushdecl_top_level (decl);
/* Initialize the association list for this type, based
on our first approximation. */
TYPE_BINFO_VTABLE (type) = decl;
TYPE_BINFO_VIRTUALS (type) = virtuals;
TREE_STATIC (decl) = 1;
#ifndef WRITABLE_VTABLES
/* Make them READONLY by default. (mrs) */
TREE_READONLY (decl) = 1;
#endif
/* At one time the vtable info was grabbed 2 words at a time. This
fails on sparc unless you have 8-byte alignment. (tiemann) */
DECL_ALIGN (decl) = MAX (TYPE_ALIGN (double_type_node),
DECL_ALIGN (decl));
/* Why is this conditional? (mrs) */
if (binfo && write_virtuals >= 0)
DECL_VIRTUAL_P (decl) = 1;
DECL_CONTEXT (decl) = type;
binfo = TYPE_BINFO (type);
SET_BINFO_NEW_VTABLE_MARKED (binfo);
return decl;
}
/* Given a base type PARENT, and a derived type TYPE, build
a name which distinguishes exactly the PARENT member of TYPE's type.
FORMAT is a string which controls how sprintf formats the name
we have generated.
For example, given
class A; class B; class C : A, B;
it is possible to distinguish "A" from "C's A". And given
class L;
class A : L; class B : L; class C : A, B;
it is possible to distinguish "L" from "A's L", and also from
"C's L from A".
Make sure to use the DECL_ASSEMBLER_NAME of the TYPE_NAME of the
type, as template have DECL_NAMEs like: X<int>, whereas the
DECL_ASSEMBLER_NAME is set to be something the assembler can handle.
*/
static tree
build_type_pathname (format, parent, type)
char *format;
tree parent, type;
{
extern struct obstack temporary_obstack;
char *first, *base, *name;
int i;
tree id;
parent = TYPE_MAIN_VARIANT (parent);
/* Remember where to cut the obstack to. */
first = obstack_base (&temporary_obstack);
/* Put on TYPE+PARENT. */
obstack_grow (&temporary_obstack,
TYPE_ASSEMBLER_NAME_STRING (type),
TYPE_ASSEMBLER_NAME_LENGTH (type));
#ifdef JOINER
obstack_1grow (&temporary_obstack, JOINER);
#else
obstack_1grow (&temporary_obstack, '_');
#endif
obstack_grow0 (&temporary_obstack,
TYPE_ASSEMBLER_NAME_STRING (parent),
TYPE_ASSEMBLER_NAME_LENGTH (parent));
i = obstack_object_size (&temporary_obstack);
base = obstack_base (&temporary_obstack);
obstack_finish (&temporary_obstack);
/* Put on FORMAT+TYPE+PARENT. */
obstack_blank (&temporary_obstack, strlen (format) + i + 1);
name = obstack_base (&temporary_obstack);
sprintf (name, format, base);
id = get_identifier (name);
obstack_free (&temporary_obstack, first);
return id;
}
/* Update the rtti info for this class. */
static void
set_rtti_entry (virtuals, offset, type)
tree virtuals, offset, type;
{
if (! flag_vtable_thunks)
TREE_VALUE (virtuals)
= build_vtable_entry (offset,
(flag_rtti
? build_t_desc (type, 0)
: integer_zero_node));
else
{
tree vfn = build1 (NOP_EXPR, vfunc_ptr_type_node, offset);
TREE_CONSTANT (vfn) = 1;
TREE_VALUE (virtuals)
= build_vtable_entry (integer_zero_node, vfn);
/* The second slot is for the tdesc pointer when thunks are used. */
vfn = flag_rtti
? build_t_desc (type, 0)
: integer_zero_node;
vfn = build1 (NOP_EXPR, vfunc_ptr_type_node, vfn);
TREE_CONSTANT (vfn) = 1;
TREE_VALUE (TREE_CHAIN (virtuals))
= build_vtable_entry (integer_zero_node, vfn);
}
}
/* Give TYPE a new virtual function table which is initialized
with a skeleton-copy of its original initialization. The only
entry that changes is the `delta' entry, so we can really
share a lot of structure.
FOR_TYPE is the derived type which caused this table to
be needed.
BINFO is the type association which provided TYPE for FOR_TYPE. */
static void
prepare_fresh_vtable (binfo, for_type)
tree binfo, for_type;
{
tree basetype = BINFO_TYPE (binfo);
tree orig_decl = BINFO_VTABLE (binfo);
/* This name is too simplistic. We can have multiple basetypes for
for_type, and we really want different names. (mrs) */
tree name = build_type_pathname (VTABLE_NAME_FORMAT, basetype, for_type);
tree new_decl = build_decl (VAR_DECL, name, TREE_TYPE (orig_decl));
tree path, offset;
int result;
/* Remember which class this vtable is really for. */
DECL_CONTEXT (new_decl) = for_type;
TREE_STATIC (new_decl) = 1;
BINFO_VTABLE (binfo) = pushdecl_top_level (new_decl);
DECL_VIRTUAL_P (new_decl) = 1;
#ifndef WRITABLE_VTABLES
/* Make them READONLY by default. (mrs) */
TREE_READONLY (new_decl) = 1;
#endif
DECL_ALIGN (new_decl) = DECL_ALIGN (orig_decl);
/* Make fresh virtual list, so we can smash it later. */
BINFO_VIRTUALS (binfo) = copy_list (BINFO_VIRTUALS (binfo));
if (TREE_VIA_VIRTUAL (binfo))
offset = BINFO_OFFSET (binfo_member (BINFO_TYPE (binfo),
CLASSTYPE_VBASECLASSES (for_type)));
else
offset = BINFO_OFFSET (binfo);
set_rtti_entry (BINFO_VIRTUALS (binfo),
size_binop (MINUS_EXPR, integer_zero_node, offset),
for_type);
#ifdef GATHER_STATISTICS
n_vtables += 1;
n_vtable_elems += list_length (BINFO_VIRTUALS (binfo));
#endif
/* Set TREE_PUBLIC and TREE_EXTERN as appropriate. */
import_export_vtable (new_decl, for_type, 0);
if (TREE_VIA_VIRTUAL (binfo))
my_friendly_assert (binfo == binfo_member (BINFO_TYPE (binfo),
CLASSTYPE_VBASECLASSES (current_class_type)),
170);
SET_BINFO_NEW_VTABLE_MARKED (binfo);
}
/* Access the virtual function table entry that logically
contains BASE_FNDECL. VIRTUALS is the virtual function table's
initializer. We can run off the end, when dealing with virtual
destructors in MI situations, return NULL_TREE in that case. */
static tree
get_vtable_entry (virtuals, base_fndecl)
tree virtuals, base_fndecl;
{
unsigned HOST_WIDE_INT n = (HOST_BITS_PER_WIDE_INT >= BITS_PER_WORD
? (TREE_INT_CST_LOW (DECL_VINDEX (base_fndecl))
& (((unsigned HOST_WIDE_INT)1<<(BITS_PER_WORD-1))-1))
: TREE_INT_CST_LOW (DECL_VINDEX (base_fndecl)));
#ifdef GATHER_STATISTICS
n_vtable_searches += n;
#endif
while (n > 0 && virtuals)
{
--n;
virtuals = TREE_CHAIN (virtuals);
}
return virtuals;
}
/* Put new entry ENTRY into virtual function table initializer
VIRTUALS.
Also update DECL_VINDEX (FNDECL). */
static void
modify_vtable_entry (old_entry_in_list, new_entry, fndecl)
tree old_entry_in_list, new_entry, fndecl;
{
tree base_fndecl = TREE_OPERAND (FNADDR_FROM_VTABLE_ENTRY (TREE_VALUE (old_entry_in_list)), 0);
#ifdef NOTQUITE
cp_warning ("replaced %D with %D", DECL_ASSEMBLER_NAME (base_fndecl),
DECL_ASSEMBLER_NAME (fndecl));
#endif
TREE_VALUE (old_entry_in_list) = new_entry;
/* Now assign virtual dispatch information, if unset. */
/* We can dispatch this, through any overridden base function. */
if (TREE_CODE (DECL_VINDEX (fndecl)) != INTEGER_CST)
{
DECL_VINDEX (fndecl) = DECL_VINDEX (base_fndecl);
DECL_CONTEXT (fndecl) = DECL_CONTEXT (base_fndecl);
}
}
/* Access the virtual function table entry i. VIRTUALS is the virtual
function table's initializer. */
static tree
get_vtable_entry_n (virtuals, n)
tree virtuals;
unsigned HOST_WIDE_INT n;
{
while (n > 0)
{
--n;
virtuals = TREE_CHAIN (virtuals);
}
return virtuals;
}
/* Add a virtual function to all the appropriate vtables for the class
T. DECL_VINDEX(X) should be error_mark_node, if we want to
allocate a new slot in our table. If it is error_mark_node, we
know that no other function from another vtable is overridden by X.
HAS_VIRTUAL keeps track of how many virtuals there are in our main
vtable for the type, and we build upon the PENDING_VIRTUALS list
and return it. */
static tree
add_virtual_function (pending_virtuals, has_virtual, fndecl, t)
tree pending_virtuals;
int *has_virtual;
tree fndecl;
tree t; /* Structure type. */
{
/* FUNCTION_TYPEs and OFFSET_TYPEs no longer freely
convert to void *. Make such a conversion here. */
tree vfn = build1 (ADDR_EXPR, vfunc_ptr_type_node, fndecl);
TREE_CONSTANT (vfn) = 1;
#ifndef DUMB_USER
if (current_class_type == 0)
cp_warning ("internal problem, current_class_type is zero when adding `%D', please report",
fndecl);
if (current_class_type && t != current_class_type)
cp_warning ("internal problem, current_class_type differs when adding `%D', please report",
fndecl);
#endif
/* If the virtual function is a redefinition of a prior one,
figure out in which base class the new definition goes,
and if necessary, make a fresh virtual function table
to hold that entry. */
if (DECL_VINDEX (fndecl) == error_mark_node)
{
tree entry;
if (flag_rtti && *has_virtual == 0)
{
/* CLASSTYPE_RTTI is only used as a Boolean (NULL or not). */
CLASSTYPE_RTTI (t) = integer_one_node;
}
/* If we are using thunks, use two slots at the front, one
for the offset pointer, one for the tdesc pointer. */
if (*has_virtual == 0 && flag_vtable_thunks)
{
*has_virtual = 1;
}
/* Build a new INT_CST for this DECL_VINDEX. */
{
static tree index_table[256];
tree index;
/* We skip a slot for the offset/tdesc entry. */
int i = ++(*has_virtual);
if (i >= 256 || index_table[i] == 0)
{
index = build_int_2 (i, 0);
if (i < 256)
index_table[i] = index;
}
else
index = index_table[i];
/* Now assign virtual dispatch information. */
DECL_VINDEX (fndecl) = index;
DECL_CONTEXT (fndecl) = t;
}
entry = build_vtable_entry (integer_zero_node, vfn);
pending_virtuals = tree_cons (DECL_VINDEX (fndecl), entry, pending_virtuals);
}
/* Might already be INTEGER_CST if declared twice in class. We will
give error later or we've already given it. */
else if (TREE_CODE (DECL_VINDEX (fndecl)) != INTEGER_CST)
{
/* Need an entry in some other virtual function table.
Deal with this after we have laid out our virtual base classes. */
pending_hard_virtuals = temp_tree_cons (fndecl, vfn, pending_hard_virtuals);
}
return pending_virtuals;
}
/* Obstack on which to build the vector of class methods. */
struct obstack class_obstack;
extern struct obstack *current_obstack;
/* Add method METHOD to class TYPE. This is used when a method
has been defined which did not initially appear in the class definition,
and helps cut down on spurious error messages.
FIELDS is the entry in the METHOD_VEC vector entry of the class type where
the method should be added. */
void
add_method (type, fields, method)
tree type, *fields, method;
{
/* We must make a copy of METHOD here, since we must be sure that
we have exclusive title to this method's DECL_CHAIN. */
tree decl;
push_obstacks (&permanent_obstack, &permanent_obstack);
{
decl = copy_node (method);
if (DECL_RTL (decl) == 0
&& (!processing_template_decl
|| !uses_template_parms (decl)))
{
make_function_rtl (decl);
DECL_RTL (method) = DECL_RTL (decl);
}
}
if (fields && *fields)
{
/* Take care not to hide destructor. */
DECL_CHAIN (decl) = DECL_CHAIN (*fields);
DECL_CHAIN (*fields) = decl;
}
else if (CLASSTYPE_METHOD_VEC (type) == 0)
{
tree method_vec = make_node (TREE_VEC);
if (TYPE_IDENTIFIER (type) == DECL_NAME (decl))
{
TREE_VEC_ELT (method_vec, 0) = decl;
TREE_VEC_LENGTH (method_vec) = 1;
}
else
{
/* ??? Is it possible for there to have been enough room in the
current chunk for the tree_vec structure but not a tree_vec
plus a tree*? Will this work in that case? */
obstack_free (current_obstack, method_vec);
obstack_blank (current_obstack, sizeof (struct tree_vec) + sizeof (tree *));
TREE_VEC_ELT (method_vec, 1) = decl;
TREE_VEC_LENGTH (method_vec) = 2;
obstack_finish (current_obstack);
}
CLASSTYPE_METHOD_VEC (type) = method_vec;
}
else
{
tree method_vec = CLASSTYPE_METHOD_VEC (type);
int len = TREE_VEC_LENGTH (method_vec);
/* Adding a new ctor or dtor. This is easy because our
METHOD_VEC always has a slot for such entries. */
if (TYPE_IDENTIFIER (type) == DECL_NAME (decl))
{
/* TREE_VEC_ELT (method_vec, 0) = decl; */
if (decl != TREE_VEC_ELT (method_vec, 0))
{
DECL_CHAIN (decl) = TREE_VEC_ELT (method_vec, 0);
TREE_VEC_ELT (method_vec, 0) = decl;
}
}
else
{
/* This is trickier. We try to extend the TREE_VEC in-place,
but if that does not work, we copy all its data to a new
TREE_VEC that's large enough. */
struct obstack *ob = &class_obstack;
tree *end = (tree *)obstack_next_free (ob);
if (end != TREE_VEC_END (method_vec))
{
ob = current_obstack;
TREE_VEC_LENGTH (method_vec) += 1;
TREE_VEC_ELT (method_vec, len) = NULL_TREE;
method_vec = copy_node (method_vec);
TREE_VEC_LENGTH (method_vec) -= 1;
}
else
{
tree tmp_vec = (tree) obstack_base (ob);
if (obstack_room (ob) < sizeof (tree))
{
obstack_blank (ob, sizeof (struct tree_common)
+ tree_code_length[(int) TREE_VEC]
* sizeof (char *)
+ len * sizeof (tree));
tmp_vec = (tree) obstack_base (ob);
bcopy ((char *) method_vec, (char *) tmp_vec,
(sizeof (struct tree_common)
+ tree_code_length[(int) TREE_VEC] * sizeof (char *)
+ (len-1) * sizeof (tree)));
method_vec = tmp_vec;
}
else
obstack_blank (ob, sizeof (tree));
}
obstack_finish (ob);
TREE_VEC_ELT (method_vec, len) = decl;
TREE_VEC_LENGTH (method_vec) = len + 1;
CLASSTYPE_METHOD_VEC (type) = method_vec;
if (TYPE_BINFO_BASETYPES (type) && CLASSTYPE_BASELINK_VEC (type))
{
/* ??? May be better to know whether these can be extended? */
tree baselink_vec = CLASSTYPE_BASELINK_VEC (type);
TREE_VEC_LENGTH (baselink_vec) += 1;
CLASSTYPE_BASELINK_VEC (type) = copy_node (baselink_vec);
TREE_VEC_LENGTH (baselink_vec) -= 1;
TREE_VEC_ELT (CLASSTYPE_BASELINK_VEC (type), len) = 0;
}
}
}
DECL_CONTEXT (decl) = type;
DECL_CLASS_CONTEXT (decl) = type;
pop_obstacks ();
}
/* Subroutines of finish_struct. */
/* Look through the list of fields for this struct, deleting
duplicates as we go. This must be recursive to handle
anonymous unions.
FIELD is the field which may not appear anywhere in FIELDS.
FIELD_PTR, if non-null, is the starting point at which
chained deletions may take place.
The value returned is the first acceptable entry found
in FIELDS.
Note that anonymous fields which are not of UNION_TYPE are
not duplicates, they are just anonymous fields. This happens
when we have unnamed bitfields, for example. */
static tree
delete_duplicate_fields_1 (field, fields)
tree field, fields;
{
tree x;
tree prev = 0;
if (DECL_NAME (field) == 0)
{
if (TREE_CODE (TREE_TYPE (field)) != UNION_TYPE)
return fields;
for (x = TYPE_FIELDS (TREE_TYPE (field)); x; x = TREE_CHAIN (x))
fields = delete_duplicate_fields_1 (x, fields);
return fields;
}
else
{
for (x = fields; x; prev = x, x = TREE_CHAIN (x))
{
if (DECL_NAME (x) == 0)
{
if (TREE_CODE (TREE_TYPE (x)) != UNION_TYPE)
continue;
TYPE_FIELDS (TREE_TYPE (x))
= delete_duplicate_fields_1 (field, TYPE_FIELDS (TREE_TYPE (x)));
if (TYPE_FIELDS (TREE_TYPE (x)) == 0)
{
if (prev == 0)
fields = TREE_CHAIN (fields);
else
TREE_CHAIN (prev) = TREE_CHAIN (x);
}
}
else
{
if (DECL_NAME (field) == DECL_NAME (x))
{
if (TREE_CODE (field) == CONST_DECL
&& TREE_CODE (x) == CONST_DECL)
cp_error_at ("duplicate enum value `%D'", x);
else if (TREE_CODE (field) == CONST_DECL
|| TREE_CODE (x) == CONST_DECL)
cp_error_at ("duplicate field `%D' (as enum and non-enum)",
x);
else if (TREE_CODE (field) == TYPE_DECL
&& TREE_CODE (x) == TYPE_DECL)
cp_error_at ("duplicate nested type `%D'", x);
else if (TREE_CODE (field) == TYPE_DECL
|| TREE_CODE (x) == TYPE_DECL)
cp_error_at ("duplicate field `%D' (as type and non-type)",
x);
else
cp_error_at ("duplicate member `%D'", x);
if (prev == 0)
fields = TREE_CHAIN (fields);
else
TREE_CHAIN (prev) = TREE_CHAIN (x);
}
}
}
}
return fields;
}
static void
delete_duplicate_fields (fields)
tree fields;
{
tree x;
for (x = fields; x && TREE_CHAIN (x); x = TREE_CHAIN (x))
TREE_CHAIN (x) = delete_duplicate_fields_1 (x, TREE_CHAIN (x));
}
/* Change the access of FDECL to ACCESS in T.
Return 1 if change was legit, otherwise return 0. */
static int
alter_access (t, fdecl, access)
tree t;
tree fdecl;
enum access_type access;
{
tree elem = purpose_member (t, DECL_ACCESS (fdecl));
if (elem && TREE_VALUE (elem) != (tree)access)
{
if (TREE_CODE (TREE_TYPE (fdecl)) == FUNCTION_DECL)
{
cp_error_at ("conflicting access specifications for method `%D', ignored", TREE_TYPE (fdecl));
}
else
error ("conflicting access specifications for field `%s', ignored",
IDENTIFIER_POINTER (DECL_NAME (fdecl)));
}
else if (TREE_PRIVATE (fdecl))
{
if (access != access_private)
cp_error_at ("cannot make private `%D' non-private", fdecl);
goto alter;
}
else if (TREE_PROTECTED (fdecl))
{
if (access != access_protected)
cp_error_at ("cannot make protected `%D' non-protected", fdecl);
goto alter;
}
/* ARM 11.3: an access declaration may not be used to restrict access
to a member that is accessible in the base class. */
else if (access != access_public)
cp_error_at ("cannot reduce access of public member `%D'", fdecl);
else if (elem == NULL_TREE)
{
alter:
DECL_ACCESS (fdecl) = tree_cons (t, (tree)access,
DECL_ACCESS (fdecl));
return 1;
}
return 0;
}
/* Return the offset to the main vtable for a given base BINFO. */
tree
get_vfield_offset (binfo)
tree binfo;
{
return size_binop (PLUS_EXPR,
size_binop (FLOOR_DIV_EXPR,
DECL_FIELD_BITPOS (CLASSTYPE_VFIELD (BINFO_TYPE (binfo))),
size_int (BITS_PER_UNIT)),
BINFO_OFFSET (binfo));
}
/* Get the offset to the start of the original binfo that we derived
this binfo from. If we find TYPE first, return the offset only
that far. The shortened search is useful because the this pointer
on method calling is expected to point to a DECL_CONTEXT (fndecl)
object, and not a baseclass of it. */
static tree
get_derived_offset (binfo, type)
tree binfo, type;
{
tree offset1 = get_vfield_offset (TYPE_BINFO (BINFO_TYPE (binfo)));
tree offset2;
int i;
while (BINFO_BASETYPES (binfo)
&& (i=CLASSTYPE_VFIELD_PARENT (BINFO_TYPE (binfo))) != -1)
{
tree binfos = BINFO_BASETYPES (binfo);
if (BINFO_TYPE (binfo) == type)
break;
binfo = TREE_VEC_ELT (binfos, i);
}
offset2 = get_vfield_offset (TYPE_BINFO (BINFO_TYPE (binfo)));
return size_binop (MINUS_EXPR, offset1, offset2);
}
/* If FOR_TYPE needs to reinitialize virtual function table pointers
for TYPE's sub-objects, add such reinitializations to BASE_INIT_LIST.
Returns BASE_INIT_LIST appropriately modified. */
static tree
maybe_fixup_vptrs (for_type, binfo, base_init_list)
tree for_type, binfo, base_init_list;
{
/* Now reinitialize any slots that don't fall under our virtual
function table pointer. */
tree vfields = CLASSTYPE_VFIELDS (BINFO_TYPE (binfo));
while (vfields)
{
tree basetype = VF_NORMAL_VALUE (vfields)
? TYPE_MAIN_VARIANT (VF_NORMAL_VALUE (vfields))
: VF_BASETYPE_VALUE (vfields);
tree base_binfo = get_binfo (basetype, for_type, 0);
/* Punt until this is implemented. */
if (1 /* BINFO_MODIFIED (base_binfo) */)
{
tree base_offset = get_vfield_offset (base_binfo);
if (! tree_int_cst_equal (base_offset, get_vfield_offset (TYPE_BINFO (for_type)))
&& ! tree_int_cst_equal (base_offset, get_vfield_offset (binfo)))
base_init_list = tree_cons (error_mark_node, base_binfo,
base_init_list);
}
vfields = TREE_CHAIN (vfields);
}
return base_init_list;
}
/* If TYPE does not have a constructor, then the compiler must
manually deal with all of the initialization this type requires.
If a base initializer exists only to fill in the virtual function
table pointer, then we mark that fact with the TREE_VIRTUAL bit.
This way, we avoid multiple initializations of the same field by
each virtual function table up the class hierarchy.
Virtual base class pointers are not initialized here. They are
initialized only at the "top level" of object creation. If we
initialized them here, we would have to skip a lot of work. */
static void
build_class_init_list (type)
tree type;
{
tree base_init_list = NULL_TREE;
tree member_init_list = NULL_TREE;
/* Since we build member_init_list and base_init_list using
tree_cons, backwards fields the all through work. */
tree x;
tree binfos = BINFO_BASETYPES (TYPE_BINFO (type));
int i, n_baseclasses = binfos ? TREE_VEC_LENGTH (binfos) : 0;
for (x = TYPE_FIELDS (type); x; x = TREE_CHAIN (x))
{
if (TREE_CODE (x) != FIELD_DECL)
continue;
if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (x))
|| DECL_INITIAL (x) != NULL_TREE)
member_init_list = tree_cons (x, type, member_init_list);
}
member_init_list = nreverse (member_init_list);
/* We will end up doing this last. Need special marker
to avoid infinite regress. */
if (TYPE_VIRTUAL_P (type))
{
base_init_list = build_tree_list (error_mark_node, TYPE_BINFO (type));
if (CLASSTYPE_NEEDS_VIRTUAL_REINIT (type) == 0)
TREE_VALUE (base_init_list) = NULL_TREE;
TREE_ADDRESSABLE (base_init_list) = 1;
}
/* Each base class which needs to have initialization
of some kind gets to make such requests known here. */
for (i = n_baseclasses-1; i >= 0; i--)
{
tree base_binfo = TREE_VEC_ELT (binfos, i);
tree blist;
/* Don't initialize virtual baseclasses this way. */
if (TREE_VIA_VIRTUAL (base_binfo))
continue;
if (TYPE_HAS_CONSTRUCTOR (BINFO_TYPE (base_binfo)))
{
/* ...and the last shall come first... */
base_init_list = maybe_fixup_vptrs (type, base_binfo, base_init_list);
base_init_list = tree_cons (NULL_TREE, base_binfo, base_init_list);
continue;
}
if ((blist = CLASSTYPE_BASE_INIT_LIST (BINFO_TYPE (base_binfo))) == NULL_TREE)
/* Nothing to initialize. */
continue;
/* ...ditto... */
base_init_list = maybe_fixup_vptrs (type, base_binfo, base_init_list);
/* This is normally true for single inheritance.
The win is we can shrink the chain of initializations
to be done by only converting to the actual type
we are interested in. */
if (TREE_VALUE (blist)
&& TREE_CODE (TREE_VALUE (blist)) == TREE_VEC
&& tree_int_cst_equal (BINFO_OFFSET (base_binfo),
BINFO_OFFSET (TREE_VALUE (blist))))
{
if (base_init_list)
{
/* Does it do more than just fill in a
virtual function table pointer? */
if (! TREE_ADDRESSABLE (blist))
base_init_list = build_tree_list (blist, base_init_list);
/* Can we get by just with the virtual function table
pointer that it fills in? */
else if (TREE_ADDRESSABLE (base_init_list)
&& TREE_VALUE (base_init_list) == 0)
base_init_list = blist;
/* Maybe, but it is not obvious as the previous case. */
else if (! CLASSTYPE_NEEDS_VIRTUAL_REINIT (type))
{
tree last = tree_last (base_init_list);
while (TREE_VALUE (last)
&& TREE_CODE (TREE_VALUE (last)) == TREE_LIST)
last = tree_last (TREE_VALUE (last));
if (TREE_VALUE (last) == 0)
base_init_list = build_tree_list (blist, base_init_list);
}
}
else
base_init_list = blist;
}
else
{
/* The function expand_aggr_init knows how to do the
initialization of `basetype' without getting
an explicit `blist'. */
if (base_init_list)
base_init_list = tree_cons (NULL_TREE, base_binfo, base_init_list);
else
base_init_list = CLASSTYPE_BINFO_AS_LIST (BINFO_TYPE (base_binfo));
}
}
if (base_init_list)
if (member_init_list)
CLASSTYPE_BASE_INIT_LIST (type) = build_tree_list (base_init_list, member_init_list);
else
CLASSTYPE_BASE_INIT_LIST (type) = base_init_list;
else if (member_init_list)
CLASSTYPE_BASE_INIT_LIST (type) = member_init_list;
}
struct base_info
{
int has_virtual;
int max_has_virtual;
int n_ancestors;
tree vfield;
tree vfields;
char cant_have_default_ctor;
char cant_have_const_ctor;
char cant_synth_copy_ctor;
char cant_synth_asn_ref;
char no_const_asn_ref;
char needs_virtual_dtor;
};
/* Record information about type T derived from its base classes.
Store most of that information in T itself, and place the
remaining information in the struct BASE_INFO.
Propagate basetype offsets throughout the lattice. Note that the
lattice topped by T is really a pair: it's a DAG that gives the
structure of the derivation hierarchy, and it's a list of the
virtual baseclasses that appear anywhere in the DAG. When a vbase
type appears in the DAG, it's offset is 0, and it's children start
their offsets from that point. When a vbase type appears in the list,
its offset is the offset it has in the hierarchy, and its children's
offsets include that offset in theirs.
Returns the index of the first base class to have virtual functions,
or -1 if no such base class.
Note that at this point TYPE_BINFO (t) != t_binfo. */
static int
finish_base_struct (t, b, t_binfo)
tree t;
struct base_info *b;
tree t_binfo;
{
tree binfos = BINFO_BASETYPES (t_binfo);
int i, n_baseclasses = binfos ? TREE_VEC_LENGTH (binfos) : 0;
int first_vfn_base_index = -1;
bzero ((char *) b, sizeof (struct base_info));
for (i = 0; i < n_baseclasses; i++)
{
tree base_binfo = TREE_VEC_ELT (binfos, i);
tree basetype = BINFO_TYPE (base_binfo);
/* If the type of basetype is incomplete, then
we already complained about that fact
(and we should have fixed it up as well). */
if (TYPE_SIZE (basetype) == 0)
{
int j;
/* The base type is of incomplete type. It is
probably best to pretend that it does not
exist. */
if (i == n_baseclasses-1)
TREE_VEC_ELT (binfos, i) = NULL_TREE;
TREE_VEC_LENGTH (binfos) -= 1;
n_baseclasses -= 1;
for (j = i; j+1 < n_baseclasses; j++)
TREE_VEC_ELT (binfos, j) = TREE_VEC_ELT (binfos, j+1);
}
if (TYPE_HAS_INIT_REF (basetype)
&& !TYPE_HAS_CONST_INIT_REF (basetype))
b->cant_have_const_ctor = 1;
if (! TYPE_HAS_INIT_REF (basetype)
|| (TYPE_HAS_NONPUBLIC_CTOR (basetype) == 2
&& ! is_friend_type (t, basetype)))
b->cant_synth_copy_ctor = 1;
if (TYPE_HAS_CONSTRUCTOR (basetype)
&& ! TYPE_HAS_DEFAULT_CONSTRUCTOR (basetype))
{
b->cant_have_default_ctor = 1;
if (! TYPE_HAS_CONSTRUCTOR (t))
{
cp_pedwarn ("base `%T' with only non-default constructor",
basetype);
cp_pedwarn ("in class without a constructor");
}
}
if (TYPE_HAS_ASSIGN_REF (basetype)
&& !TYPE_HAS_CONST_ASSIGN_REF (basetype))
b->no_const_asn_ref = 1;
if (! TYPE_HAS_ASSIGN_REF (basetype)
|| TYPE_HAS_ABSTRACT_ASSIGN_REF (basetype)
|| (TYPE_HAS_NONPUBLIC_ASSIGN_REF (basetype) == 2
&& ! is_friend_type (t, basetype)))
b->cant_synth_asn_ref = 1;
b->n_ancestors += CLASSTYPE_N_SUPERCLASSES (basetype);
TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (basetype);
TYPE_NEEDS_DESTRUCTOR (t) |= TYPE_NEEDS_DESTRUCTOR (basetype);
TYPE_HAS_COMPLEX_ASSIGN_REF (t) |= TYPE_HAS_COMPLEX_ASSIGN_REF (basetype);
TYPE_HAS_COMPLEX_INIT_REF (t) |= TYPE_HAS_COMPLEX_INIT_REF (basetype);
TYPE_OVERLOADS_CALL_EXPR (t) |= TYPE_OVERLOADS_CALL_EXPR (basetype);
TYPE_OVERLOADS_ARRAY_REF (t) |= TYPE_OVERLOADS_ARRAY_REF (basetype);
TYPE_OVERLOADS_ARROW (t) |= TYPE_OVERLOADS_ARROW (basetype);
if (! TREE_VIA_VIRTUAL (base_binfo)
#if 0
/* This cannot be done, as prepare_fresh_vtable wants to modify
binfos associated with vfields anywhere in the hierarchy, not
just immediate base classes. Due to unsharing, the compiler
might consume 3% more memory on a real program.
*/
&& ! BINFO_OFFSET_ZEROP (base_binfo)
#endif
&& BINFO_BASETYPES (base_binfo))
{
tree base_binfos = BINFO_BASETYPES (base_binfo);
tree chain = NULL_TREE;
int j;
/* Now unshare the structure beneath BASE_BINFO. */
for (j = TREE_VEC_LENGTH (base_binfos)-1;
j >= 0; j--)
{
tree base_base_binfo = TREE_VEC_ELT (base_binfos, j);
if (! TREE_VIA_VIRTUAL (base_base_binfo))
TREE_VEC_ELT (base_binfos, j)
= make_binfo (BINFO_OFFSET (base_base_binfo),
base_base_binfo,
BINFO_VTABLE (base_base_binfo),
BINFO_VIRTUALS (base_base_binfo),
chain);
chain = TREE_VEC_ELT (base_binfos, j);
TREE_VIA_PUBLIC (chain) = TREE_VIA_PUBLIC (base_base_binfo);
TREE_VIA_PROTECTED (chain) = TREE_VIA_PROTECTED (base_base_binfo);
BINFO_INHERITANCE_CHAIN (chain) = base_binfo;
}
/* Completely unshare potentially shared data, and
update what is ours. */
propagate_binfo_offsets (base_binfo, BINFO_OFFSET (base_binfo));
}
if (! TREE_VIA_VIRTUAL (base_binfo))
CLASSTYPE_N_SUPERCLASSES (t) += 1;
if (TYPE_VIRTUAL_P (basetype))
{
/* If there's going to be a destructor needed, make
sure it will be virtual. */
b->needs_virtual_dtor = 1;
/* Don't borrow virtuals from virtual baseclasses. */
if (TREE_VIA_VIRTUAL (base_binfo))
continue;
if (first_vfn_base_index < 0)
{
tree vfields;
first_vfn_base_index = i;
/* Update these two, now that we know what vtable we are
going to extend. This is so that we can add virtual
functions, and override them properly. */
BINFO_VTABLE (t_binfo) = TYPE_BINFO_VTABLE (basetype);
BINFO_VIRTUALS (t_binfo) = TYPE_BINFO_VIRTUALS (basetype);
b->has_virtual = CLASSTYPE_VSIZE (basetype);
b->vfield = CLASSTYPE_VFIELD (basetype);
b->vfields = copy_list (CLASSTYPE_VFIELDS (basetype));
vfields = b->vfields;
while (vfields)
{
if (VF_BINFO_VALUE (vfields) == NULL_TREE
|| ! TREE_VIA_VIRTUAL (VF_BINFO_VALUE (vfields)))
{
tree value = VF_BASETYPE_VALUE (vfields);
if (DECL_NAME (CLASSTYPE_VFIELD (value))
== DECL_NAME (CLASSTYPE_VFIELD (basetype)))
VF_NORMAL_VALUE (b->vfields) = basetype;
else
VF_NORMAL_VALUE (b->vfields) = VF_NORMAL_VALUE (vfields);
}
vfields = TREE_CHAIN (vfields);
}
CLASSTYPE_VFIELD (t) = b->vfield;
}
else
{
/* Only add unique vfields, and flatten them out as we go. */
tree vfields = CLASSTYPE_VFIELDS (basetype);
while (vfields)
{
if (VF_BINFO_VALUE (vfields) == NULL_TREE
|| ! TREE_VIA_VIRTUAL (VF_BINFO_VALUE (vfields)))
{
tree value = VF_BASETYPE_VALUE (vfields);
b->vfields = tree_cons (base_binfo, value, b->vfields);
if (DECL_NAME (CLASSTYPE_VFIELD (value))
== DECL_NAME (CLASSTYPE_VFIELD (basetype)))
VF_NORMAL_VALUE (b->vfields) = basetype;
else
VF_NORMAL_VALUE (b->vfields) = VF_NORMAL_VALUE (vfields);
}
vfields = TREE_CHAIN (vfields);
}
if (b->has_virtual == 0)
{
first_vfn_base_index = i;
/* Update these two, now that we know what vtable we are
going to extend. This is so that we can add virtual
functions, and override them properly. */
BINFO_VTABLE (t_binfo) = TYPE_BINFO_VTABLE (basetype);
BINFO_VIRTUALS (t_binfo) = TYPE_BINFO_VIRTUALS (basetype);
b->has_virtual = CLASSTYPE_VSIZE (basetype);
b->vfield = CLASSTYPE_VFIELD (basetype);
CLASSTYPE_VFIELD (t) = b->vfield;
/* When we install the first one, set the VF_NORMAL_VALUE
to be the current class, as this it is the most derived
class. Hopefully, this is not set to something else
later. (mrs) */
vfields = b->vfields;
while (vfields)
{
if (DECL_NAME (CLASSTYPE_VFIELD (t))
== DECL_NAME (CLASSTYPE_VFIELD (basetype)))
{
VF_NORMAL_VALUE (vfields) = t;
/* There should only be one of them! And it should
always be found, if we get into here. (mrs) */
break;
}
vfields = TREE_CHAIN (vfields);
}
}
}
}
}
/* Must come after offsets are fixed for all bases. */
for (i = 0; i < n_baseclasses; i++)
{
tree base_binfo = TREE_VEC_ELT (binfos, i);
tree basetype = BINFO_TYPE (base_binfo);
if (get_base_distance (basetype, t_binfo, 0, (tree*)0) == -2)
{
cp_warning ("direct base `%T' inaccessible in `%T' due to ambiguity",
basetype, t);
b->cant_synth_asn_ref = 1;
b->cant_synth_copy_ctor = 1;
}
}
{
tree v = get_vbase_types (t_binfo);
for (; v; v = TREE_CHAIN (v))
{
tree basetype = BINFO_TYPE (v);
if (get_base_distance (basetype, t_binfo, 0, (tree*)0) == -2)
{
if (extra_warnings)
cp_warning ("virtual base `%T' inaccessible in `%T' due to ambiguity",
basetype, t);
b->cant_synth_asn_ref = 1;
b->cant_synth_copy_ctor = 1;
}
}
}
{
tree vfields;
/* Find the base class with the largest number of virtual functions. */
for (vfields = b->vfields; vfields; vfields = TREE_CHAIN (vfields))
{
if (CLASSTYPE_VSIZE (VF_BASETYPE_VALUE (vfields)) > b->max_has_virtual)
b->max_has_virtual = CLASSTYPE_VSIZE (VF_BASETYPE_VALUE (vfields));
if (VF_DERIVED_VALUE (vfields)
&& CLASSTYPE_VSIZE (VF_DERIVED_VALUE (vfields)) > b->max_has_virtual)
b->max_has_virtual = CLASSTYPE_VSIZE (VF_DERIVED_VALUE (vfields));
}
}
if (b->vfield == 0)
/* If all virtual functions come only from virtual baseclasses. */
return -1;
return first_vfn_base_index;
}
static int
typecode_p (type, code)
tree type;
enum tree_code code;
{
return (TREE_CODE (type) == code
|| (TREE_CODE (type) == REFERENCE_TYPE
&& TREE_CODE (TREE_TYPE (type)) == code));
}
/* Set memoizing fields and bits of T (and its variants) for later use.
MAX_HAS_VIRTUAL is the largest size of any T's virtual function tables. */
static void
finish_struct_bits (t, max_has_virtual)
tree t;
int max_has_virtual;
{
int i, n_baseclasses = CLASSTYPE_N_BASECLASSES (t);
tree method_vec = CLASSTYPE_METHOD_VEC (t);
/* Fix up variants (if any). */
tree variants = TYPE_NEXT_VARIANT (t);
while (variants)
{
/* These fields are in the _TYPE part of the node, not in
the TYPE_LANG_SPECIFIC component, so they are not shared. */
TYPE_HAS_CONSTRUCTOR (variants) = TYPE_HAS_CONSTRUCTOR (t);
TYPE_HAS_DESTRUCTOR (variants) = TYPE_HAS_DESTRUCTOR (t);
TYPE_NEEDS_CONSTRUCTING (variants) = TYPE_NEEDS_CONSTRUCTING (t);
TYPE_NEEDS_DESTRUCTOR (variants) = TYPE_NEEDS_DESTRUCTOR (t);
TYPE_USES_COMPLEX_INHERITANCE (variants) = TYPE_USES_COMPLEX_INHERITANCE (t);
TYPE_VIRTUAL_P (variants) = TYPE_VIRTUAL_P (t);
TYPE_USES_VIRTUAL_BASECLASSES (variants) = TYPE_USES_VIRTUAL_BASECLASSES (t);
/* Copy whatever these are holding today. */
TYPE_MIN_VALUE (variants) = TYPE_MIN_VALUE (t);
TYPE_MAX_VALUE (variants) = TYPE_MAX_VALUE (t);
variants = TYPE_NEXT_VARIANT (variants);
}
if (n_baseclasses && max_has_virtual)
{
/* Done by `finish_struct' for classes without baseclasses. */
int might_have_abstract_virtuals = CLASSTYPE_ABSTRACT_VIRTUALS (t) != 0;
tree binfos = TYPE_BINFO_BASETYPES (t);
for (i = n_baseclasses-1; i >= 0; i--)
{
might_have_abstract_virtuals
|= (CLASSTYPE_ABSTRACT_VIRTUALS (BINFO_TYPE (TREE_VEC_ELT (binfos, i))) != 0);
if (might_have_abstract_virtuals)
break;
}
if (might_have_abstract_virtuals)
{
/* We use error_mark_node from override_one_vtable to signal
an artificial abstract. */
if (CLASSTYPE_ABSTRACT_VIRTUALS (t) == error_mark_node)
CLASSTYPE_ABSTRACT_VIRTUALS (t) = NULL_TREE;
CLASSTYPE_ABSTRACT_VIRTUALS (t) = get_abstract_virtuals (t);
}
}
if (n_baseclasses)
{
/* Notice whether this class has type conversion functions defined. */
tree binfo = TYPE_BINFO (t);
tree binfos = BINFO_BASETYPES (binfo);
tree basetype;
for (i = n_baseclasses-1; i >= 0; i--)
{
basetype = BINFO_TYPE (TREE_VEC_ELT (binfos, i));
if (TYPE_HAS_CONVERSION (basetype))
{
TYPE_HAS_CONVERSION (t) = 1;
TYPE_HAS_INT_CONVERSION (t) |= TYPE_HAS_INT_CONVERSION (basetype);
TYPE_HAS_REAL_CONVERSION (t) |= TYPE_HAS_REAL_CONVERSION (basetype);
}
if (CLASSTYPE_MAX_DEPTH (basetype) >= CLASSTYPE_MAX_DEPTH (t))
CLASSTYPE_MAX_DEPTH (t) = CLASSTYPE_MAX_DEPTH (basetype) + 1;
}
}
/* If this type has a copy constructor, force its mode to be BLKmode, and
force its TREE_ADDRESSABLE bit to be nonzero. This will cause it to
be passed by invisible reference and prevent it from being returned in
a register. */
if (! TYPE_HAS_TRIVIAL_INIT_REF (t))
{
tree variants;
if (TREE_CODE (TYPE_NAME (t)) == TYPE_DECL)
DECL_MODE (TYPE_NAME (t)) = BLKmode;
for (variants = t; variants; variants = TYPE_NEXT_VARIANT (variants))
{
TYPE_MODE (variants) = BLKmode;
TREE_ADDRESSABLE (variants) = 1;
}
}
}
/* Add FN to the method_vec growing on the class_obstack. Used by
finish_struct_methods. */
static void
grow_method (fn, method_vec_ptr)
tree fn;
tree *method_vec_ptr;
{
tree method_vec = (tree)obstack_base (&class_obstack);
tree *testp = &TREE_VEC_ELT (method_vec, 0);
if (*testp == NULL_TREE)
testp++;
while (((HOST_WIDE_INT) testp
< (HOST_WIDE_INT) obstack_next_free (&class_obstack))
&& DECL_NAME (*testp) != DECL_NAME (fn))
testp++;
if ((HOST_WIDE_INT) testp
< (HOST_WIDE_INT) obstack_next_free (&class_obstack))
{
tree x, prev_x;
for (x = *testp; x; x = DECL_CHAIN (x))
{
if (DECL_NAME (fn) == ansi_opname[(int) DELETE_EXPR]
|| DECL_NAME (fn) == ansi_opname[(int) VEC_DELETE_EXPR])
{
/* ANSI C++ June 5 1992 WP 12.5.5.1 */
cp_error_at ("`%D' overloaded", fn);
cp_error_at ("previous declaration as `%D' here", x);
}
if (DECL_ASSEMBLER_NAME (fn)==DECL_ASSEMBLER_NAME (x))
{
/* We complain about multiple destructors on sight,
so we do not repeat the warning here. Friend-friend
ambiguities are warned about outside this loop. */
if (!DESTRUCTOR_NAME_P (DECL_ASSEMBLER_NAME (fn)))
cp_error_at ("ambiguous method `%#D' in structure", fn);
break;
}
prev_x = x;
}
if (x == 0)
{
if (*testp)
DECL_CHAIN (prev_x) = fn;
else
*testp = fn;
}
}
else
{
obstack_ptr_grow (&class_obstack, fn);
*method_vec_ptr = (tree)obstack_base (&class_obstack);
}
}
/* Warn about duplicate methods in fn_fields. Also compact method
lists so that lookup can be made faster.
Algorithm: Outer loop builds lists by method name. Inner loop
checks for redundant method names within a list.
Data Structure: List of method lists. The outer list is a
TREE_LIST, whose TREE_PURPOSE field is the field name and the
TREE_VALUE is the DECL_CHAIN of the FUNCTION_DECLs. TREE_CHAIN
links the entire list of methods for TYPE_METHODS. Friends are
chained in the same way as member functions (? TREE_CHAIN or
DECL_CHAIN), but they live in the TREE_TYPE field of the outer
list. That allows them to be quickly deleted, and requires no
extra storage.
If there are any constructors/destructors, they are moved to the
front of the list. This makes pushclass more efficient.
We also link each field which has shares a name with its baseclass
to the head of the list of fields for that base class. This allows
us to reduce search time in places like `build_method_call' to
consider only reasonably likely functions. */
static tree
finish_struct_methods (t, fn_fields, nonprivate_method)
tree t;
tree fn_fields;
int nonprivate_method;
{
tree method_vec;
tree save_fn_fields = tree_cons (NULL_TREE, NULL_TREE, fn_fields);
tree lastp;
tree name = constructor_name (t);
int i, n_baseclasses = CLASSTYPE_N_BASECLASSES (t);
/* Now prepare to gather fn_fields into vector. */
struct obstack *ambient_obstack = current_obstack;
current_obstack = &class_obstack;
method_vec = make_node (TREE_VEC);
/* Room has been saved for constructors and destructors. */
current_obstack = ambient_obstack;
/* Now make this a live vector. */
obstack_free (&class_obstack, method_vec);
obstack_blank (&class_obstack, sizeof (struct tree_vec));
/* First fill in entry 0 with the constructors, and the next few with
type conversion operators (if any). */
for (lastp = save_fn_fields; fn_fields; fn_fields = TREE_CHAIN (lastp))
{
tree fn_name = DECL_NAME (fn_fields);
if (fn_name == NULL_TREE)
fn_name = name;
/* Clear out this flag.
@@ Doug may figure out how to break
@@ this with nested classes and friends. */
DECL_IN_AGGR_P (fn_fields) = 0;
/* Note here that a copy ctor is private, so we don't dare generate
a default copy constructor for a class that has a member
of this type without making sure they have access to it. */
if (fn_name == name)
{
tree parmtypes = FUNCTION_ARG_CHAIN (fn_fields);
tree parmtype = parmtypes ? TREE_VALUE (parmtypes) : void_type_node;
if (TREE_CODE (parmtype) == REFERENCE_TYPE
&& TYPE_MAIN_VARIANT (TREE_TYPE (parmtype)) == t)
{
if (TREE_CHAIN (parmtypes) == NULL_TREE
|| TREE_CHAIN (parmtypes) == void_list_node
|| TREE_PURPOSE (TREE_CHAIN (parmtypes)))
{
if (TREE_PROTECTED (fn_fields))
TYPE_HAS_NONPUBLIC_CTOR (t) = 1;
else if (TREE_PRIVATE (fn_fields))
TYPE_HAS_NONPUBLIC_CTOR (t) = 2;
}
}
/* Constructors are handled easily in search routines. */
DECL_CHAIN (fn_fields) = TREE_VEC_ELT (method_vec, 0);
TREE_VEC_ELT (method_vec, 0) = fn_fields;
}
else if (IDENTIFIER_TYPENAME_P (fn_name))
{
tree return_type = TREE_TYPE (TREE_TYPE (fn_fields));
if (typecode_p (return_type, INTEGER_TYPE)
|| typecode_p (return_type, BOOLEAN_TYPE)
|| typecode_p (return_type, ENUMERAL_TYPE))
TYPE_HAS_INT_CONVERSION (t) = 1;
else if (typecode_p (return_type, REAL_TYPE))
TYPE_HAS_REAL_CONVERSION (t) = 1;
grow_method (fn_fields, &method_vec);
}
else
{
lastp = fn_fields;
continue;
}
TREE_CHAIN (lastp) = TREE_CHAIN (fn_fields);
TREE_CHAIN (fn_fields) = NULL_TREE;
}
fn_fields = TREE_CHAIN (save_fn_fields);
while (fn_fields)
{
tree nextp;
tree fn_name = DECL_NAME (fn_fields);
if (fn_name == NULL_TREE)
fn_name = name;
nextp = TREE_CHAIN (fn_fields);
TREE_CHAIN (fn_fields) = NULL_TREE;
if (fn_name == ansi_opname[(int) MODIFY_EXPR])
{
tree parmtype = TREE_VALUE (FUNCTION_ARG_CHAIN (fn_fields));
if (copy_assignment_arg_p (parmtype, DECL_VIRTUAL_P (fn_fields)))
{
if (TREE_PROTECTED (fn_fields))
TYPE_HAS_NONPUBLIC_ASSIGN_REF (t) = 1;
else if (TREE_PRIVATE (fn_fields))
TYPE_HAS_NONPUBLIC_ASSIGN_REF (t) = 2;
}
}
grow_method (fn_fields, &method_vec);
fn_fields = nextp;
}
TREE_VEC_LENGTH (method_vec) = (tree *)obstack_next_free (&class_obstack)
- (&TREE_VEC_ELT (method_vec, 0));
obstack_finish (&class_obstack);
CLASSTYPE_METHOD_VEC (t) = method_vec;
if (nonprivate_method == 0
&& CLASSTYPE_FRIEND_CLASSES (t) == NULL_TREE
&& DECL_FRIENDLIST (TYPE_NAME (t)) == NULL_TREE)
{
tree binfos = BINFO_BASETYPES (TYPE_BINFO (t));
for (i = 0; i < n_baseclasses; i++)
if (TREE_VIA_PUBLIC (TREE_VEC_ELT (binfos, i))
|| TREE_VIA_PROTECTED (TREE_VEC_ELT (binfos, i)))
{
nonprivate_method = 1;
break;
}
if (nonprivate_method == 0)
cp_warning ("all member functions in class `%T' are private", t);
}
/* If there are constructors (and destructors), they are at the
front. Place destructors at very front. Also warn if all
constructors and/or destructors are private (in which case this
class is effectively unusable. */
if (TYPE_HAS_DESTRUCTOR (t))
{
tree dtor, prev;
for (dtor = TREE_VEC_ELT (method_vec, 0);
dtor;
prev = dtor, dtor = DECL_CHAIN (dtor))
{
if (DESTRUCTOR_NAME_P (DECL_ASSEMBLER_NAME (dtor)))
{
if (TREE_PRIVATE (dtor)
&& CLASSTYPE_FRIEND_CLASSES (t) == NULL_TREE
&& DECL_FRIENDLIST (TYPE_NAME (t)) == NULL_TREE
&& warn_ctor_dtor_privacy)
cp_warning ("`%#T' only defines a private destructor and has no friends",
t);
break;
}
}
/* Wild parse errors can cause this to happen. */
if (dtor == NULL_TREE)
TYPE_HAS_DESTRUCTOR (t) = 0;
else if (dtor != TREE_VEC_ELT (method_vec, 0))
{
DECL_CHAIN (prev) = DECL_CHAIN (dtor);
DECL_CHAIN (dtor) = TREE_VEC_ELT (method_vec, 0);
TREE_VEC_ELT (method_vec, 0) = dtor;
}
}
/* Now for each member function (except for constructors and
destructors), compute where member functions of the same
name reside in base classes. */
if (n_baseclasses != 0
&& TREE_VEC_LENGTH (method_vec) > 1)
{
int len = TREE_VEC_LENGTH (method_vec);
tree baselink_vec = make_tree_vec (len);
int any_links = 0;
tree baselink_binfo = build_tree_list (NULL_TREE, TYPE_BINFO (t));
for (i = 1; i < len; i++)
{
TREE_VEC_ELT (baselink_vec, i)
= get_baselinks (baselink_binfo, t, DECL_NAME (TREE_VEC_ELT (method_vec, i)));
if (TREE_VEC_ELT (baselink_vec, i) != 0)
any_links = 1;
}
if (any_links != 0)
CLASSTYPE_BASELINK_VEC (t) = baselink_vec;
else
obstack_free (current_obstack, baselink_vec);
}
/* Now add the methods to the TYPE_METHODS of T, arranged in a chain. */
{
tree x, last_x = NULL_TREE;
int limit = TREE_VEC_LENGTH (method_vec);
for (i = 1; i < limit; i++)
{
for (x = TREE_VEC_ELT (method_vec, i); x; x = DECL_CHAIN (x))
{
if (last_x != NULL_TREE)
TREE_CHAIN (last_x) = x;
last_x = x;
}
}
/* Put ctors and dtors at the front of the list. */
x = TREE_VEC_ELT (method_vec, 0);
if (x)
{
while (DECL_CHAIN (x))
{
/* Let's avoid being circular about this. */
if (x == DECL_CHAIN (x))
break;
TREE_CHAIN (x) = DECL_CHAIN (x);
x = DECL_CHAIN (x);
}
if (TREE_VEC_LENGTH (method_vec) > 1)
TREE_CHAIN (x) = TREE_VEC_ELT (method_vec, 1);
else
TREE_CHAIN (x) = NULL_TREE;
}
}
TYPE_METHODS (t) = method_vec;
return method_vec;
}
/* Emit error when a duplicate definition of a type is seen. Patch up. */
void
duplicate_tag_error (t)
tree t;
{
cp_error ("redefinition of `%#T'", t);
cp_error_at ("previous definition here", t);
/* Pretend we haven't defined this type. */
/* All of the component_decl's were TREE_CHAINed together in the parser.
finish_struct_methods walks these chains and assembles all methods with
the same base name into DECL_CHAINs. Now we don't need the parser chains
anymore, so we unravel them.
*/
/*
* This used to be in finish_struct, but it turns out that the
* TREE_CHAIN is used by dbxout_type_methods and perhaps some other things...
*/
if (CLASSTYPE_METHOD_VEC(t))
{
tree tv = CLASSTYPE_METHOD_VEC(t);
int i, len = TREE_VEC_LENGTH (tv);
for (i = 0; i < len; i++)
{
tree unchain = TREE_VEC_ELT (tv, i);
while (unchain != NULL_TREE)
{
TREE_CHAIN (unchain) = NULL_TREE;
unchain = DECL_CHAIN(unchain);
}
}
}
if (TYPE_LANG_SPECIFIC (t))
{
tree as_list = CLASSTYPE_AS_LIST (t);
tree binfo = TYPE_BINFO (t);
tree binfo_as_list = CLASSTYPE_BINFO_AS_LIST (t);
int interface_only = CLASSTYPE_INTERFACE_ONLY (t);
int interface_unknown = CLASSTYPE_INTERFACE_UNKNOWN (t);
bzero ((char *) TYPE_LANG_SPECIFIC (t), sizeof (struct lang_type));
BINFO_BASETYPES(binfo) = NULL_TREE;
CLASSTYPE_AS_LIST (t) = as_list;
TYPE_BINFO (t) = binfo;
CLASSTYPE_BINFO_AS_LIST (t) = binfo_as_list;
CLASSTYPE_INTERFACE_ONLY (t) = interface_only;
SET_CLASSTYPE_INTERFACE_UNKNOWN_X (t, interface_unknown);
CLASSTYPE_VBASE_SIZE (t) = integer_zero_node;
TYPE_REDEFINED (t) = 1;
}
TYPE_SIZE (t) = NULL_TREE;
TYPE_MODE (t) = VOIDmode;
TYPE_FIELDS (t) = NULL_TREE;
TYPE_METHODS (t) = NULL_TREE;
TYPE_VFIELD (t) = NULL_TREE;
TYPE_CONTEXT (t) = NULL_TREE;
}
/* finish up all new vtables. */
static void
finish_vtbls (binfo, do_self, t)
tree binfo, t;
int do_self;
{
tree binfos = BINFO_BASETYPES (binfo);
int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0;
/* Should we use something besides CLASSTYPE_VFIELDS? */
if (do_self && CLASSTYPE_VFIELDS (BINFO_TYPE (binfo)))
{
if (BINFO_NEW_VTABLE_MARKED (binfo))
{
tree decl, context;
decl = BINFO_VTABLE (binfo);
context = DECL_CONTEXT (decl);
DECL_CONTEXT (decl) = 0;
if (write_virtuals >= 0
&& DECL_INITIAL (decl) != BINFO_VIRTUALS (binfo))
DECL_INITIAL (decl) = build_nt (CONSTRUCTOR, NULL_TREE,
BINFO_VIRTUALS (binfo));
cp_finish_decl (decl, DECL_INITIAL (decl), NULL_TREE, 0, 0);
DECL_CONTEXT (decl) = context;
}
CLEAR_BINFO_NEW_VTABLE_MARKED (binfo);
}
for (i = 0; i < n_baselinks; i++)
{
tree base_binfo = TREE_VEC_ELT (binfos, i);
int is_not_base_vtable =
i != CLASSTYPE_VFIELD_PARENT (BINFO_TYPE (binfo));
if (TREE_VIA_VIRTUAL (base_binfo))
{
base_binfo = binfo_member (BINFO_TYPE (base_binfo), CLASSTYPE_VBASECLASSES (t));
}
finish_vtbls (base_binfo, is_not_base_vtable, t);
}
}
/* True if we should override the given BASE_FNDECL with the given
FNDECL. */
static int
overrides (fndecl, base_fndecl)
tree fndecl, base_fndecl;
{
/* Destructors have special names. */
if (DESTRUCTOR_NAME_P (DECL_ASSEMBLER_NAME (base_fndecl)) &&
DESTRUCTOR_NAME_P (DECL_ASSEMBLER_NAME (fndecl)))
return 1;
if (DESTRUCTOR_NAME_P (DECL_ASSEMBLER_NAME (base_fndecl)) ||
DESTRUCTOR_NAME_P (DECL_ASSEMBLER_NAME (fndecl)))
return 0;
if (DECL_NAME (fndecl) == DECL_NAME (base_fndecl))
{
tree rettype, base_rettype, types, base_types;
#if 0
retypes = TREE_TYPE (TREE_TYPE (fndecl));
base_retypes = TREE_TYPE (TREE_TYPE (base_fndecl));
#endif
types = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
base_types = TYPE_ARG_TYPES (TREE_TYPE (base_fndecl));
if ((TYPE_READONLY (TREE_TYPE (TREE_VALUE (base_types)))
== TYPE_READONLY (TREE_TYPE (TREE_VALUE (types))))
&& compparms (TREE_CHAIN (base_types), TREE_CHAIN (types), 3))
return 1;
}
return 0;
}
static tree
get_class_offset_1 (parent, binfo, context, t, fndecl)
tree parent, binfo, context, t, fndecl;
{
tree binfos = BINFO_BASETYPES (binfo);
int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0;
tree rval = NULL_TREE;
if (binfo == parent)
return error_mark_node;
for (i = 0; i < n_baselinks; i++)
{
tree base_binfo = TREE_VEC_ELT (binfos, i);
tree nrval;
if (TREE_VIA_VIRTUAL (base_binfo))
base_binfo = binfo_member (BINFO_TYPE (base_binfo),
CLASSTYPE_VBASECLASSES (t));
nrval = get_class_offset_1 (parent, base_binfo, context, t, fndecl);
/* See if we have a new value */
if (nrval && (nrval != error_mark_node || rval==0))
{
/* Only compare if we have two offsets */
if (rval && rval != error_mark_node
&& ! tree_int_cst_equal (nrval, rval))
{
/* Only give error if the two offsets are different */
error ("every virtual function must have a unique final overrider");
cp_error (" found two (or more) `%T' class subobjects in `%T'", context, t);
cp_error (" with virtual `%D' from virtual base class", fndecl);
return rval;
}
rval = nrval;
}
if (rval && BINFO_TYPE (binfo) == context)
{
my_friendly_assert (rval == error_mark_node
|| tree_int_cst_equal (rval, BINFO_OFFSET (binfo)), 999);
rval = BINFO_OFFSET (binfo);
}
}
return rval;
}
/* Get the offset to the CONTEXT subobject that is related to the
given BINFO. */
static tree
get_class_offset (context, t, binfo, fndecl)
tree context, t, binfo, fndecl;
{
tree first_binfo = binfo;
tree offset;
int i;
if (context == t)
return integer_zero_node;
if (BINFO_TYPE (binfo) == context)
return BINFO_OFFSET (binfo);
/* Check less derived binfos first. */
while (BINFO_BASETYPES (binfo)
&& (i=CLASSTYPE_VFIELD_PARENT (BINFO_TYPE (binfo))) != -1)
{
tree binfos = BINFO_BASETYPES (binfo);
binfo = TREE_VEC_ELT (binfos, i);
if (BINFO_TYPE (binfo) == context)
return BINFO_OFFSET (binfo);
}
/* Ok, not found in the less derived binfos, now check the more
derived binfos. */
offset = get_class_offset_1 (first_binfo, TYPE_BINFO (t), context, t, fndecl);
if (offset==0 || TREE_CODE (offset) != INTEGER_CST)
my_friendly_abort (999); /* we have to find it. */
return offset;
}
/* Skip RTTI information at the front of the virtual list. */
unsigned HOST_WIDE_INT
skip_rtti_stuff (virtuals)
tree *virtuals;
{
int n;
n = 0;
if (*virtuals)
{
/* We always reserve a slot for the offset/tdesc entry. */
++n;
*virtuals = TREE_CHAIN (*virtuals);
}
if (flag_vtable_thunks && *virtuals)
{
/* The second slot is reserved for the tdesc pointer when thunks
are used. */
++n;
*virtuals = TREE_CHAIN (*virtuals);
}
return n;
}
static void
modify_one_vtable (binfo, t, fndecl, pfn)
tree binfo, t, fndecl, pfn;
{
tree virtuals = BINFO_VIRTUALS (binfo);
tree old_rtti;
unsigned HOST_WIDE_INT n;
/* update rtti entry */
if (flag_rtti)
{
if (binfo == TYPE_BINFO (t))
{
if (! BINFO_NEW_VTABLE_MARKED (binfo))
build_vtable (TYPE_BINFO (DECL_CONTEXT (CLASSTYPE_VFIELD (t))), t);
}
else
{
if (! BINFO_NEW_VTABLE_MARKED (binfo))
prepare_fresh_vtable (binfo, t);
}
}
if (fndecl == NULL_TREE)
return;
n = skip_rtti_stuff (&virtuals);
while (virtuals)
{
tree current_fndecl = TREE_VALUE (virtuals);
current_fndecl = FNADDR_FROM_VTABLE_ENTRY (current_fndecl);
current_fndecl = TREE_OPERAND (current_fndecl, 0);
if (current_fndecl && overrides (fndecl, current_fndecl))
{
tree base_offset, offset;
tree context = DECL_CLASS_CONTEXT (fndecl);
tree vfield = CLASSTYPE_VFIELD (t);
tree this_offset;
offset = get_class_offset (context, t, binfo, fndecl);
/* Find the right offset for the this pointer based on the
base class we just found. We have to take into
consideration the virtual base class pointers that we
stick in before the virtual function table pointer.
Also, we want just the delta between the most base class
that we derived this vfield from and us. */
base_offset = size_binop (PLUS_EXPR,
get_derived_offset (binfo, DECL_CONTEXT (current_fndecl)),
BINFO_OFFSET (binfo));
this_offset = size_binop (MINUS_EXPR, offset, base_offset);
/* Make sure we can modify the derived association with immunity. */
if (TREE_USED (binfo))
my_friendly_assert (0, 999);
if (binfo == TYPE_BINFO (t))
{
/* In this case, it is *type*'s vtable we are modifying.
We start with the approximation that it's vtable is that
of the immediate base class. */
if (! BINFO_NEW_VTABLE_MARKED (binfo))
build_vtable (TYPE_BINFO (DECL_CONTEXT (vfield)), t);
}
else
{
/* This is our very own copy of `basetype' to play with.
Later, we will fill in all the virtual functions
that override the virtual functions in these base classes
which are not defined by the current type. */
if (! BINFO_NEW_VTABLE_MARKED (binfo))
prepare_fresh_vtable (binfo, t);
}
#ifdef NOTQUITE
cp_warning ("in %D", DECL_NAME (BINFO_VTABLE (binfo)));
#endif
modify_vtable_entry (get_vtable_entry_n (BINFO_VIRTUALS (binfo), n),
build_vtable_entry (this_offset, pfn),
fndecl);
}
++n;
virtuals = TREE_CHAIN (virtuals);
}
}
/* These are the ones that are not through virtual base classes. */
static void
modify_all_direct_vtables (binfo, do_self, t, fndecl, pfn)
tree binfo, t, fndecl, pfn;
int do_self;
{
tree binfos = BINFO_BASETYPES (binfo);
int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0;
/* Should we use something besides CLASSTYPE_VFIELDS? */
if (do_self && CLASSTYPE_VFIELDS (BINFO_TYPE (binfo)))
{
modify_one_vtable (binfo, t, fndecl, pfn);
}
for (i = 0; i < n_baselinks; i++)
{
tree base_binfo = TREE_VEC_ELT (binfos, i);
int is_not_base_vtable =
i != CLASSTYPE_VFIELD_PARENT (BINFO_TYPE (binfo));
if (! TREE_VIA_VIRTUAL (base_binfo))
modify_all_direct_vtables (base_binfo, is_not_base_vtable, t, fndecl, pfn);
}
}
/* Fixup all the delta entries in this one vtable that need updating. */
static void
fixup_vtable_deltas1 (binfo, t)
tree binfo, t;
{
tree virtuals = BINFO_VIRTUALS (binfo);
unsigned HOST_WIDE_INT n;
n = skip_rtti_stuff (&virtuals);
while (virtuals)
{
tree fndecl = TREE_VALUE (virtuals);
tree pfn = FNADDR_FROM_VTABLE_ENTRY (fndecl);
tree delta = DELTA_FROM_VTABLE_ENTRY (fndecl);
fndecl = TREE_OPERAND (pfn, 0);
if (fndecl)
{
tree base_offset, offset;
tree context = DECL_CLASS_CONTEXT (fndecl);
tree vfield = CLASSTYPE_VFIELD (t);
tree this_offset;
offset = get_class_offset (context, t, binfo, fndecl);
/* Find the right offset for the this pointer based on the
base class we just found. We have to take into
consideration the virtual base class pointers that we
stick in before the virtual function table pointer.
Also, we want just the delta between the most base class
that we derived this vfield from and us. */
base_offset = size_binop (PLUS_EXPR,
get_derived_offset (binfo, DECL_CONTEXT (fndecl)),
BINFO_OFFSET (binfo));
this_offset = size_binop (MINUS_EXPR, offset, base_offset);
if (! tree_int_cst_equal (this_offset, delta))
{
/* Make sure we can modify the derived association with immunity. */
if (TREE_USED (binfo))
my_friendly_assert (0, 999);
if (binfo == TYPE_BINFO (t))
{
/* In this case, it is *type*'s vtable we are modifying.
We start with the approximation that it's vtable is that
of the immediate base class. */
if (! BINFO_NEW_VTABLE_MARKED (binfo))
build_vtable (TYPE_BINFO (DECL_CONTEXT (vfield)), t);
}
else
{
/* This is our very own copy of `basetype' to play with.
Later, we will fill in all the virtual functions
that override the virtual functions in these base classes
which are not defined by the current type. */
if (! BINFO_NEW_VTABLE_MARKED (binfo))
prepare_fresh_vtable (binfo, t);
}
modify_vtable_entry (get_vtable_entry_n (BINFO_VIRTUALS (binfo), n),
build_vtable_entry (this_offset, pfn),
fndecl);
}
}
++n;
virtuals = TREE_CHAIN (virtuals);
}
}
/* Fixup all the delta entries in all the direct vtables that need updating.
This happens when we have non-overridden virtual functions from a
virtual base class, that are at a different offset, in the new
hierarchy, because the layout of the virtual bases has changed. */
static void
fixup_vtable_deltas (binfo, init_self, t)
tree binfo, t;
int init_self;
{
tree binfos = BINFO_BASETYPES (binfo);
int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0;
for (i = 0; i < n_baselinks; i++)
{
tree base_binfo = TREE_VEC_ELT (binfos, i);
int is_not_base_vtable =
i != CLASSTYPE_VFIELD_PARENT (BINFO_TYPE (binfo));
if (! TREE_VIA_VIRTUAL (base_binfo))
fixup_vtable_deltas (base_binfo, is_not_base_vtable, t);
}
/* Should we use something besides CLASSTYPE_VFIELDS? */
if (init_self && CLASSTYPE_VFIELDS (BINFO_TYPE (binfo)))
{
fixup_vtable_deltas1 (binfo, t);
}
}
/* These are the ones that are through virtual base classes. */
static void
modify_all_indirect_vtables (binfo, do_self, via_virtual, t, fndecl, pfn)
tree binfo, t, fndecl, pfn;
int do_self, via_virtual;
{
tree binfos = BINFO_BASETYPES (binfo);
int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0;
/* Should we use something besides CLASSTYPE_VFIELDS? */
if (do_self && via_virtual && CLASSTYPE_VFIELDS (BINFO_TYPE (binfo)))
{
modify_one_vtable (binfo, t, fndecl, pfn);
}
for (i = 0; i < n_baselinks; i++)
{
tree base_binfo = TREE_VEC_ELT (binfos, i);
int is_not_base_vtable =
i != CLASSTYPE_VFIELD_PARENT (BINFO_TYPE (binfo));
if (TREE_VIA_VIRTUAL (base_binfo))
{
via_virtual = 1;
base_binfo = binfo_member (BINFO_TYPE (base_binfo), CLASSTYPE_VBASECLASSES (t));
}
modify_all_indirect_vtables (base_binfo, is_not_base_vtable, via_virtual, t, fndecl, pfn);
}
}
static void
modify_all_vtables (t, fndecl, vfn)
tree t, fndecl, vfn;
{
/* Do these first, so that we will make use of any non-virtual class's
vtable, over a virtual classes vtable. */
modify_all_direct_vtables (TYPE_BINFO (t), 1, t, fndecl, vfn);
if (TYPE_USES_VIRTUAL_BASECLASSES (t))
modify_all_indirect_vtables (TYPE_BINFO (t), 1, 0, t, fndecl, vfn);
}
/* Here, we already know that they match in every respect.
All we have to check is where they had their declarations. */
static int
strictly_overrides (fndecl1, fndecl2)
tree fndecl1, fndecl2;
{
int distance = get_base_distance (DECL_CLASS_CONTEXT (fndecl2),
DECL_CLASS_CONTEXT (fndecl1),
0, (tree *)0);
if (distance == -2 || distance > 0)
return 1;
return 0;
}
/* Merge overrides for one vtable.
If we want to merge in same function, we are fine.
else
if one has a DECL_CLASS_CONTEXT that is a parent of the
other, than choose the more derived one
else
potentially ill-formed (see 10.3 [class.virtual])
we have to check later to see if there was an
override in this class. If there was ok, if not
then it is ill-formed. (mrs)
We take special care to reuse a vtable, if we can. */
static void
override_one_vtable (binfo, old, t)
tree binfo, old, t;
{
tree virtuals = BINFO_VIRTUALS (binfo);
tree old_virtuals = BINFO_VIRTUALS (old);
enum { REUSE_NEW, REUSE_OLD, UNDECIDED, NEITHER } choose = UNDECIDED;
/* If we have already committed to modifying it, then don't try and
reuse another vtable. */
if (BINFO_NEW_VTABLE_MARKED (binfo))
choose = NEITHER;
skip_rtti_stuff (&virtuals);
skip_rtti_stuff (&old_virtuals);
while (virtuals)
{
tree fndecl = TREE_VALUE (virtuals);
tree old_fndecl = TREE_VALUE (old_virtuals);
fndecl = FNADDR_FROM_VTABLE_ENTRY (fndecl);
old_fndecl = FNADDR_FROM_VTABLE_ENTRY (old_fndecl);
fndecl = TREE_OPERAND (fndecl, 0);
old_fndecl = TREE_OPERAND (old_fndecl, 0);
/* First check to see if they are the same. */
if (DECL_ASSEMBLER_NAME (fndecl) == DECL_ASSEMBLER_NAME (old_fndecl))
{
/* No need to do anything. */
}
else if (strictly_overrides (fndecl, old_fndecl))
{
if (choose == UNDECIDED)
choose = REUSE_NEW;
else if (choose == REUSE_OLD)
{
choose = NEITHER;
if (! BINFO_NEW_VTABLE_MARKED (binfo))
{
prepare_fresh_vtable (binfo, t);
override_one_vtable (binfo, old, t);
return;
}
}
}
else if (strictly_overrides (old_fndecl, fndecl))
{
if (choose == UNDECIDED)
choose = REUSE_OLD;
else if (choose == REUSE_NEW)
{
choose = NEITHER;
if (! BINFO_NEW_VTABLE_MARKED (binfo))
{
prepare_fresh_vtable (binfo, t);
override_one_vtable (binfo, old, t);
return;
}
TREE_VALUE (virtuals) = TREE_VALUE (old_virtuals);
}
else if (choose == NEITHER)
{
TREE_VALUE (virtuals) = TREE_VALUE (old_virtuals);
}
}
else
{
choose = NEITHER;
if (! BINFO_NEW_VTABLE_MARKED (binfo))
{
prepare_fresh_vtable (binfo, t);
override_one_vtable (binfo, old, t);
return;
}
{
/* This MUST be overridden, or the class is ill-formed. */
/* For now, we just make it abstract. */
tree fndecl = TREE_OPERAND (FNADDR_FROM_VTABLE_ENTRY (TREE_VALUE (virtuals)), 0);
tree vfn;
fndecl = copy_node (fndecl);
copy_lang_decl (fndecl);
DECL_ABSTRACT_VIRTUAL_P (fndecl) = 1;
/* Make sure we search for it later. */
if (! CLASSTYPE_ABSTRACT_VIRTUALS (t))
CLASSTYPE_ABSTRACT_VIRTUALS (t) = error_mark_node;
vfn = build1 (ADDR_EXPR, vfunc_ptr_type_node, fndecl);
TREE_CONSTANT (vfn) = 1;
/* We can use integer_zero_node, as we will will core dump
if this is used anyway. */
TREE_VALUE (virtuals) = build_vtable_entry (integer_zero_node, vfn);
}
}
virtuals = TREE_CHAIN (virtuals);
old_virtuals = TREE_CHAIN (old_virtuals);
}
/* Let's reuse the old vtable. */
if (choose == REUSE_OLD)
{
BINFO_VTABLE (binfo) = BINFO_VTABLE (old);
BINFO_VIRTUALS (binfo) = BINFO_VIRTUALS (old);
}
}
/* Merge in overrides for virtual bases.
BINFO is the hierarchy we want to modify, and OLD has the potential
overrides. */
static void
merge_overrides (binfo, old, do_self, t)
tree binfo, old, t;
int do_self;
{
tree binfos = BINFO_BASETYPES (binfo);
tree old_binfos = BINFO_BASETYPES (old);
int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0;
/* Should we use something besides CLASSTYPE_VFIELDS? */
if (do_self && CLASSTYPE_VFIELDS (BINFO_TYPE (binfo)))
{
override_one_vtable (binfo, old, t);
}
for (i = 0; i < n_baselinks; i++)
{
tree base_binfo = TREE_VEC_ELT (binfos, i);
tree old_base_binfo = TREE_VEC_ELT (old_binfos, i);
int is_not_base_vtable =
i != CLASSTYPE_VFIELD_PARENT (BINFO_TYPE (binfo));
if (! TREE_VIA_VIRTUAL (base_binfo))
merge_overrides (base_binfo, old_base_binfo, is_not_base_vtable, t);
}
}
extern int interface_only, interface_unknown;
/* Create a RECORD_TYPE or UNION_TYPE node for a C struct or union declaration
(or C++ class declaration).
For C++, we must handle the building of derived classes.
Also, C++ allows static class members. The way that this is
handled is to keep the field name where it is (as the DECL_NAME
of the field), and place the overloaded decl in the DECL_FIELD_BITPOS
of the field. layout_record and layout_union will know about this.
More C++ hair: inline functions have text in their
DECL_PENDING_INLINE_INFO nodes which must somehow be parsed into
meaningful tree structure. After the struct has been laid out, set
things up so that this can happen.
And still more: virtual functions. In the case of single inheritance,
when a new virtual function is seen which redefines a virtual function
from the base class, the new virtual function is placed into
the virtual function table at exactly the same address that
it had in the base class. When this is extended to multiple
inheritance, the same thing happens, except that multiple virtual
function tables must be maintained. The first virtual function
table is treated in exactly the same way as in the case of single
inheritance. Additional virtual function tables have different
DELTAs, which tell how to adjust `this' to point to the right thing.
LIST_OF_FIELDLISTS is just that. The elements of the list are
TREE_LIST elements, whose TREE_PURPOSE field tells what access
the list has, and the TREE_VALUE slot gives the actual fields.
If flag_all_virtual == 1, then we lay all functions into
the virtual function table, as though they were declared
virtual. Constructors do not lay down in the virtual function table.
If flag_all_virtual == 2, then we lay all functions into
the virtual function table, such that virtual functions
occupy a space by themselves, and then all functions
of the class occupy a space by themselves. This is illustrated
in the following diagram:
class A; class B : A;
Class A's vtbl: Class B's vtbl:
--------------------------------------------------------------------
| A's virtual functions| | B's virtual functions |
| | | (may inherit some from A). |
--------------------------------------------------------------------
| All of A's functions | | All of A's functions |
| (such as a->A::f). | | (such as b->A::f) |
--------------------------------------------------------------------
| B's new virtual functions |
| (not defined in A.) |
-------------------------------
| All of B's functions |
| (such as b->B::f) |
-------------------------------
this allows the program to make references to any function, virtual
or otherwise in a type-consistent manner. */
tree
finish_struct_1 (t, warn_anon)
tree t;
int warn_anon;
{
int old;
int round_up_size = 1;
tree name = TYPE_IDENTIFIER (t);
enum tree_code code = TREE_CODE (t);
tree fields = TYPE_FIELDS (t);
tree fn_fields = CLASSTYPE_METHODS (t);
tree x, last_x, method_vec;
int needs_virtual_dtor;
int all_virtual;
int has_virtual;
int max_has_virtual;
tree pending_virtuals = NULL_TREE;
tree abstract_virtuals = NULL_TREE;
tree vfield;
tree vfields;
int cant_have_default_ctor;
int cant_have_const_ctor;
int cant_synth_copy_ctor;
int cant_synth_asn_ref;
int no_const_asn_ref;
/* The index of the first base class which has virtual
functions. Only applied to non-virtual baseclasses. */
int first_vfn_base_index;
int n_baseclasses;
int any_default_members = 0;
int const_sans_init = 0;
int ref_sans_init = 0;
int nonprivate_method = 0;
tree t_binfo = TYPE_BINFO (t);
tree access_decls = NULL_TREE;
int aggregate = 1;
if (warn_anon && code != UNION_TYPE && ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
pedwarn ("anonymous class type not used to declare any objects");
if (TYPE_SIZE (t))
{
if (IS_AGGR_TYPE (t))
cp_error ("redefinition of `%#T'", t);
else
my_friendly_abort (172);
popclass (0);
return t;
}
if (dont_allow_type_definitions)
{
pedwarn ("types cannot be defined %s",
dont_allow_type_definitions);
}
GNU_xref_decl (current_function_decl, t);
/* If this type was previously laid out as a forward reference,
make sure we lay it out again. */
TYPE_SIZE (t) = NULL_TREE;
CLASSTYPE_GOT_SEMICOLON (t) = 0;
#if 0
/* This is in general too late to do this. I moved the main case up to
left_curly, what else needs to move? */
if (! IS_SIGNATURE (t))
{
my_friendly_assert (CLASSTYPE_INTERFACE_ONLY (t) == interface_only, 999);
my_friendly_assert (CLASSTYPE_INTERFACE_KNOWN (t) == ! interface_unknown, 999);
}
#endif
#if 0
if (flag_rtti)
build_t_desc (t, 0);
#endif
TYPE_BINFO (t) = NULL_TREE;
old = suspend_momentary ();
/* Install struct as DECL_FIELD_CONTEXT of each field decl.
Also process specified field sizes.
Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
The specified size is found in the DECL_INITIAL.
Store 0 there, except for ": 0" fields (so we can find them
and delete them, below). */
if (t_binfo && BINFO_BASETYPES (t_binfo))
n_baseclasses = TREE_VEC_LENGTH (BINFO_BASETYPES (t_binfo));
else
n_baseclasses = 0;
if (n_baseclasses > 0)
{
struct base_info base_info;
/* If using multiple inheritance, this may cause variants of our
basetypes to be used (instead of their canonical forms). */
tree vf = layout_basetypes (t, BINFO_BASETYPES (t_binfo));
last_x = tree_last (vf);
fields = chainon (vf, fields);
first_vfn_base_index = finish_base_struct (t, &base_info, t_binfo);
/* Remember where we got our vfield from */
CLASSTYPE_VFIELD_PARENT (t) = first_vfn_base_index;
has_virtual = base_info.has_virtual;
max_has_virtual = base_info.max_has_virtual;
CLASSTYPE_N_SUPERCLASSES (t) += base_info.n_ancestors;
vfield = base_info.vfield;
vfields = base_info.vfields;
cant_have_default_ctor = base_info.cant_have_default_ctor;
cant_have_const_ctor = base_info.cant_have_const_ctor;
cant_synth_copy_ctor = base_info.cant_synth_copy_ctor;
cant_synth_asn_ref = base_info.cant_synth_asn_ref;
no_const_asn_ref = base_info.no_const_asn_ref;
needs_virtual_dtor = base_info.needs_virtual_dtor;
n_baseclasses = TREE_VEC_LENGTH (BINFO_BASETYPES (t_binfo));
aggregate = 0;
}
else
{
first_vfn_base_index = -1;
has_virtual = 0;
max_has_virtual = has_virtual;
vfield = NULL_TREE;
vfields = NULL_TREE;
last_x = NULL_TREE;
cant_have_default_ctor = 0;
cant_have_const_ctor = 0;
cant_synth_copy_ctor = 0;
cant_synth_asn_ref = 0;
no_const_asn_ref = 0;
needs_virtual_dtor = 0;
}
#if 0
/* Both of these should be done before now. */
if (write_virtuals == 3 && CLASSTYPE_INTERFACE_KNOWN (t)
&& ! IS_SIGNATURE (t))
{
my_friendly_assert (CLASSTYPE_INTERFACE_ONLY (t) == interface_only, 999);
my_friendly_assert (CLASSTYPE_VTABLE_NEEDS_WRITING (t) == ! interface_only, 999);
}
#endif
/* The three of these are approximations which may later be
modified. Needed at this point to make add_virtual_function
and modify_vtable_entries work. */
TREE_CHAIN (t_binfo) = TYPE_BINFO (t);
TYPE_BINFO (t) = t_binfo;
CLASSTYPE_VFIELDS (t) = vfields;
CLASSTYPE_VFIELD (t) = vfield;
if (IS_SIGNATURE (t))
all_virtual = 0;
else if (flag_all_virtual == 1 && TYPE_OVERLOADS_METHOD_CALL_EXPR (t))
all_virtual = 1;
else
all_virtual = 0;
for (x = CLASSTYPE_METHODS (t); x; x = TREE_CHAIN (x))
{
GNU_xref_member (current_class_name, x);
nonprivate_method |= ! TREE_PRIVATE (x);
/* If this was an evil function, don't keep it in class. */
if (IDENTIFIER_ERROR_LOCUS (DECL_ASSEMBLER_NAME (x)))
continue;
DECL_CLASS_CONTEXT (x) = t;
/* Do both of these, even though they're in the same union;
if the insn `r' member and the size `i' member are
different sizes, as on the alpha, the larger of the two
will end up with garbage in it. */
DECL_SAVED_INSNS (x) = NULL_RTX;
DECL_FIELD_SIZE (x) = 0;
/* The name of the field is the original field name
Save this in auxiliary field for later overloading. */
if (DECL_VINDEX (x)
|| (all_virtual == 1 && ! DECL_CONSTRUCTOR_P (x)))
{
pending_virtuals = add_virtual_function (pending_virtuals,
&has_virtual, x, t);
if (DECL_ABSTRACT_VIRTUAL_P (x))
abstract_virtuals = tree_cons (NULL_TREE, x, abstract_virtuals);
else
TREE_USED (x) = 1;
}
}
for (x = TYPE_FIELDS (t); x; x = TREE_CHAIN (x))
{
GNU_xref_member (current_class_name, x);
/* Handle access declarations. */
if (DECL_NAME (x) && TREE_CODE (DECL_NAME (x)) == SCOPE_REF)
{
tree fdecl = TREE_OPERAND (DECL_NAME (x), 1);
enum access_type access
= TREE_PRIVATE (x) ? access_private :
TREE_PROTECTED (x) ? access_protected : access_public;
if (last_x)
TREE_CHAIN (last_x) = TREE_CHAIN (x);
else
fields = TREE_CHAIN (x);
access_decls = tree_cons ((tree) access, fdecl, access_decls);
continue;
}
last_x = x;
if (TREE_CODE (x) == TYPE_DECL)
continue;
/* If we've gotten this far, it's a data member, possibly static,
or an enumerator. */
DECL_FIELD_CONTEXT (x) = t;
/* ``A local class cannot have static data members.'' ARM 9.4 */
if (current_function_decl && TREE_STATIC (x))
cp_error_at ("field `%D' in local class cannot be static", x);
/* Perform error checking that did not get done in
grokdeclarator. */
if (TREE_CODE (TREE_TYPE (x)) == FUNCTION_TYPE)
{
cp_error_at ("field `%D' invalidly declared function type",
x);
TREE_TYPE (x) = build_pointer_type (TREE_TYPE (x));
}
else if (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE)
{
cp_error_at ("field `%D' invalidly declared method type", x);
TREE_TYPE (x) = build_pointer_type (TREE_TYPE (x));
}
else if (TREE_CODE (TREE_TYPE (x)) == OFFSET_TYPE)
{
cp_error_at ("field `%D' invalidly declared offset type", x);
TREE_TYPE (x) = build_pointer_type (TREE_TYPE (x));
}
#if 0
if (DECL_NAME (x) == constructor_name (t))
cant_have_default_ctor = cant_synth_copy_ctor = 1;
#endif
if (TREE_TYPE (x) == error_mark_node)
continue;
DECL_SAVED_INSNS (x) = NULL_RTX;
DECL_FIELD_SIZE (x) = 0;
/* When this goes into scope, it will be a non-local reference. */
DECL_NONLOCAL (x) = 1;
if (TREE_CODE (x) == CONST_DECL)
continue;
if (TREE_CODE (x) == VAR_DECL)
{
if (TREE_CODE (t) == UNION_TYPE)
/* Unions cannot have static members. */
cp_error_at ("field `%D' declared static in union", x);
continue;
}
/* Now it can only be a FIELD_DECL. */
if (TREE_PRIVATE (x) || TREE_PROTECTED (x))
aggregate = 0;
/* If this is of reference type, check if it needs an init.
Also do a little ANSI jig if necessary. */
if (TREE_CODE (TREE_TYPE (x)) == REFERENCE_TYPE)
{
if (DECL_INITIAL (x) == NULL_TREE)
ref_sans_init = 1;
/* ARM $12.6.2: [A member initializer list] (or, for an
aggregate, initialization by a brace-enclosed list) is the
only way to initialize nonstatic const and reference
members. */
cant_synth_asn_ref = 1;
cant_have_default_ctor = 1;
if (! TYPE_HAS_CONSTRUCTOR (t) && extra_warnings)
{
if (DECL_NAME (x))
cp_warning_at ("non-static reference `%#D' in class without a constructor", x);
else
cp_warning_at ("non-static reference in class without a constructor", x);
}
}
/* If any field is const, the structure type is pseudo-const. */
if (TREE_READONLY (x))
{
C_TYPE_FIELDS_READONLY (t) = 1;
if (DECL_INITIAL (x) == NULL_TREE)
const_sans_init = 1;
/* ARM $12.6.2: [A member initializer list] (or, for an
aggregate, initialization by a brace-enclosed list) is the
only way to initialize nonstatic const and reference
members. */
cant_synth_asn_ref = 1;
cant_have_default_ctor = 1;
if (! TYPE_HAS_CONSTRUCTOR (t) && !IS_SIGNATURE (t)
&& extra_warnings)
{
if (DECL_NAME (x))
cp_warning_at ("non-static const member `%#D' in class without a constructor", x);
else
cp_warning_at ("non-static const member in class without a constructor", x);
}
}
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 (IS_AGGR_TYPE (t1))
{
if (C_TYPE_FIELDS_READONLY (t1))
C_TYPE_FIELDS_READONLY (t) = 1;
if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (t1))
const_sans_init = 1;
}
}
/* We set DECL_BIT_FIELD tentatively in grokbitfield.
If the type and width are valid, we'll keep it set.
Otherwise, the flag is cleared. */
if (DECL_BIT_FIELD (x))
{
DECL_BIT_FIELD (x) = 0;
/* Invalid bit-field size done by grokfield. */
/* Detect invalid bit-field type. */
if (DECL_INITIAL (x)
&& ! INTEGRAL_TYPE_P (TREE_TYPE (x)))
{
cp_error_at ("bit-field `%#D' with non-integral type", x);
DECL_INITIAL (x) = NULL;
}
/* Detect and ignore out of range field width. */
if (DECL_INITIAL (x))
{
register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
if (width < 0)
{
DECL_INITIAL (x) = NULL;
cp_error_at ("negative width in bit-field `%D'", x);
}
else if (width == 0 && DECL_NAME (x) != 0)
{
DECL_INITIAL (x) = NULL;
cp_error_at ("zero width for bit-field `%D'", x);
}
else if (width
> TYPE_PRECISION (long_long_unsigned_type_node))
{
/* The backend will dump if you try to use something
too big; avoid that. */
DECL_INITIAL (x) = NULL;
sorry ("bit-fields larger than %d bits",
TYPE_PRECISION (long_long_unsigned_type_node));
cp_error_at (" in declaration of `%D'", x);
}
else if (width > TYPE_PRECISION (TREE_TYPE (x))
&& TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
{
cp_warning_at ("width of `%D' exceeds its type", x);
}
else if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
&& ((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))) > width)))
{
cp_warning_at ("`%D' is too small to hold all values of `%#T'",
x, TREE_TYPE (x));
}
}
/* Process valid field width. */
if (DECL_INITIAL (x))
{
register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
if (width == 0)
{
#ifdef EMPTY_FIELD_BOUNDARY
/* field size 0 => mark following field as "aligned" */
if (TREE_CHAIN (x))
DECL_ALIGN (TREE_CHAIN (x))
= MAX (DECL_ALIGN (TREE_CHAIN (x)), EMPTY_FIELD_BOUNDARY);
/* field of size 0 at the end => round up the size. */
else
round_up_size = EMPTY_FIELD_BOUNDARY;
#endif
#ifdef PCC_BITFIELD_TYPE_MATTERS
DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
TYPE_ALIGN (TREE_TYPE (x)));
#endif
}
else
{
DECL_INITIAL (x) = NULL_TREE;
DECL_FIELD_SIZE (x) = width;
DECL_BIT_FIELD (x) = 1;
/* Traditionally a bit field is unsigned
even if declared signed. */
if (flag_traditional
&& TREE_CODE (TREE_TYPE (x)) == INTEGER_TYPE)
TREE_TYPE (x) = unsigned_type_node;
}
}
else
/* Non-bit-fields are aligned for their type. */
DECL_ALIGN (x) = MAX (DECL_ALIGN (x), TYPE_ALIGN (TREE_TYPE (x)));
}
else
{
tree type = TREE_TYPE (x);
if (TREE_CODE (type) == ARRAY_TYPE)
type = TREE_TYPE (type);
if (TYPE_LANG_SPECIFIC (type) && ! ANON_UNION_P (x)
&& ! TYPE_PTRMEMFUNC_P (type))
{
/* Never let anything with uninheritable virtuals
make it through without complaint. */
if (CLASSTYPE_ABSTRACT_VIRTUALS (type))
abstract_virtuals_error (x, type);
/* Don't let signatures make it through either. */
if (IS_SIGNATURE (type))
signature_error (x, type);
if (code == UNION_TYPE)
{
char *fie = NULL;
if (TYPE_NEEDS_CONSTRUCTING (type))
fie = "constructor";
else if (TYPE_NEEDS_DESTRUCTOR (type))
fie = "destructor";
else if (TYPE_HAS_REAL_ASSIGNMENT (type))
fie = "assignment operator";
if (fie)
cp_error_at ("member `%#D' with %s not allowed in union", x,
fie);
}
else
{
TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (type);
TYPE_NEEDS_DESTRUCTOR (t) |= TYPE_NEEDS_DESTRUCTOR (type);
TYPE_HAS_COMPLEX_ASSIGN_REF (t) |= TYPE_HAS_COMPLEX_ASSIGN_REF (type);
TYPE_HAS_COMPLEX_INIT_REF (t) |= TYPE_HAS_COMPLEX_INIT_REF (type);
}
if (! TYPE_HAS_INIT_REF (type)
|| (TYPE_HAS_NONPUBLIC_CTOR (type)
&& ! is_friend (t, type)))
cant_synth_copy_ctor = 1;
else if (!TYPE_HAS_CONST_INIT_REF (type))
cant_have_const_ctor = 1;
if (! TYPE_HAS_ASSIGN_REF (type)
|| (TYPE_HAS_NONPUBLIC_ASSIGN_REF (type)
&& ! is_friend (t, type)))
cant_synth_asn_ref = 1;
else if (!TYPE_HAS_CONST_ASSIGN_REF (type))
no_const_asn_ref = 1;
if (TYPE_HAS_CONSTRUCTOR (type)
&& ! TYPE_HAS_DEFAULT_CONSTRUCTOR (type))
{
cant_have_default_ctor = 1;
#if 0
/* This is wrong for aggregates. */
if (! TYPE_HAS_CONSTRUCTOR (t))
{
if (DECL_NAME (x))
cp_pedwarn_at ("member `%#D' with only non-default constructor", x);
else
cp_pedwarn_at ("member with only non-default constructor", x);
cp_pedwarn_at ("in class without a constructor",
x);
}
#endif
}
}
if (DECL_INITIAL (x) != NULL_TREE)
{
/* `build_class_init_list' does not recognize
non-FIELD_DECLs. */
if (code == UNION_TYPE && any_default_members != 0)
cp_error_at ("multiple fields in union `%T' initialized");
any_default_members = 1;
}
}
}
/* If this type has any constant members which did not come
with their own initialization, mark that fact here. It is
not an error here, since such types can be saved either by their
constructors, or by fortuitous initialization. */
CLASSTYPE_READONLY_FIELDS_NEED_INIT (t) = const_sans_init;
CLASSTYPE_REF_FIELDS_NEED_INIT (t) = ref_sans_init;
CLASSTYPE_ABSTRACT_VIRTUALS (t) = abstract_virtuals;
/* Synthesize any needed methods. Note that methods will be synthesized
for anonymous unions; grok_x_components undoes that. */
if (! fn_fields)
nonprivate_method = 1;
if (TYPE_NEEDS_DESTRUCTOR (t) && !TYPE_HAS_DESTRUCTOR (t)
&& !IS_SIGNATURE (t))
{
/* Here we must cons up a destructor on the fly. */
tree dtor = cons_up_default_function (t, name, needs_virtual_dtor != 0);
/* If we couldn't make it work, then pretend we didn't need it. */
if (dtor == void_type_node)
TYPE_NEEDS_DESTRUCTOR (t) = 0;
else
{
/* Link dtor onto end of fn_fields. */
TREE_CHAIN (dtor) = fn_fields;
fn_fields = dtor;
if (DECL_VINDEX (dtor) == NULL_TREE
&& (needs_virtual_dtor
|| pending_virtuals != NULL_TREE
|| pending_hard_virtuals != NULL_TREE))
DECL_VINDEX (dtor) = error_mark_node;
if (DECL_VINDEX (dtor))
pending_virtuals = add_virtual_function (pending_virtuals,
&has_virtual, dtor, t);
nonprivate_method = 1;
}
}
TYPE_NEEDS_DESTRUCTOR (t) |= TYPE_HAS_DESTRUCTOR (t);
if (flag_rtti && (max_has_virtual > 0 || needs_virtual_dtor) &&
has_virtual == 0)
has_virtual = 1;
TYPE_HAS_COMPLEX_INIT_REF (t)
|= (TYPE_HAS_INIT_REF (t) || TYPE_USES_VIRTUAL_BASECLASSES (t)
|| any_default_members);
TYPE_NEEDS_CONSTRUCTING (t)
|= (TYPE_HAS_CONSTRUCTOR (t) || TYPE_USES_VIRTUAL_BASECLASSES (t)
|| has_virtual || any_default_members || first_vfn_base_index >= 0);
if (! IS_SIGNATURE (t))
CLASSTYPE_NON_AGGREGATE (t)
= ! aggregate || has_virtual || TYPE_HAS_CONSTRUCTOR (t);
/* ARM $12.1: A default constructor will be generated for a class X
only if no constructor has been declared for class X. So we
check TYPE_HAS_CONSTRUCTOR also, to make sure we don't generate
one if they declared a constructor in this class. */
if (! TYPE_HAS_CONSTRUCTOR (t) && ! cant_have_default_ctor
&& ! IS_SIGNATURE (t))
{
tree default_fn = cons_up_default_function (t, name, 2);
TREE_CHAIN (default_fn) = fn_fields;
fn_fields = default_fn;
}
/* Create default copy constructor, if needed. */
if (! TYPE_HAS_INIT_REF (t) && ! cant_synth_copy_ctor
&& ! IS_SIGNATURE (t))
{
/* ARM 12.18: You get either X(X&) or X(const X&), but
not both. --Chip */
tree default_fn = cons_up_default_function (t, name,
3 + cant_have_const_ctor);
TREE_CHAIN (default_fn) = fn_fields;
fn_fields = default_fn;
}
TYPE_HAS_REAL_ASSIGNMENT (t) |= TYPE_HAS_ASSIGNMENT (t);
TYPE_HAS_REAL_ASSIGN_REF (t) |= TYPE_HAS_ASSIGN_REF (t);
TYPE_HAS_COMPLEX_ASSIGN_REF (t)
|= TYPE_HAS_ASSIGN_REF (t) || TYPE_USES_VIRTUAL_BASECLASSES (t);
if (! TYPE_HAS_ASSIGN_REF (t) && ! cant_synth_asn_ref
&& ! IS_SIGNATURE (t))
{
tree default_fn = cons_up_default_function (t, name,
5 + no_const_asn_ref);
TREE_CHAIN (default_fn) = fn_fields;
fn_fields = default_fn;
}
if (fn_fields)
{
method_vec = finish_struct_methods (t, fn_fields, nonprivate_method);
if (TYPE_HAS_CONSTRUCTOR (t)
&& CLASSTYPE_FRIEND_CLASSES (t) == NULL_TREE
&& DECL_FRIENDLIST (TYPE_NAME (t)) == NULL_TREE)
{
int nonprivate_ctor = 0;
tree ctor;
for (ctor = TREE_VEC_ELT (method_vec, 0);
ctor;
ctor = DECL_CHAIN (ctor))
if (! TREE_PRIVATE (ctor))
{
nonprivate_ctor = 1;
break;
}
if (nonprivate_ctor == 0 && warn_ctor_dtor_privacy)
cp_warning ("`%#T' only defines private constructors and has no friends",
t);
}
}
else
{
method_vec = 0;
/* Just in case these got accidentally
filled in by syntax errors. */
TYPE_HAS_CONSTRUCTOR (t) = 0;
TYPE_HAS_DESTRUCTOR (t) = 0;
}
{
int n_methods = method_vec ? TREE_VEC_LENGTH (method_vec) : 0;
for (access_decls = nreverse (access_decls); access_decls;
access_decls = TREE_CHAIN (access_decls))
{
tree fdecl = TREE_VALUE (access_decls);
tree flist = NULL_TREE;
tree name;
enum access_type access = (enum access_type)TREE_PURPOSE(access_decls);
int i = TREE_VEC_ELT (method_vec, 0) ? 0 : 1;
tree tmp;
if (TREE_CODE (fdecl) == TREE_LIST)
{
flist = fdecl;
fdecl = TREE_VALUE (flist);
}
name = DECL_NAME (fdecl);
for (; i < n_methods; i++)
if (DECL_NAME (TREE_VEC_ELT (method_vec, i)) == name)
{
cp_error ("cannot adjust access to `%#D' in `%#T'", fdecl, t);
cp_error_at (" because of local method `%#D' with same name",
TREE_VEC_ELT (method_vec, i));
fdecl = NULL_TREE;
break;
}
if (! fdecl)
continue;
for (tmp = fields; tmp; tmp = TREE_CHAIN (tmp))
if (DECL_NAME (tmp) == name)
{
cp_error ("cannot adjust access to `%#D' in `%#T'", fdecl, t);
cp_error_at (" because of local field `%#D' with same name", tmp);
fdecl = NULL_TREE;
break;
}
if (!fdecl)
continue;
/* Make type T see field decl FDECL with access ACCESS.*/
if (flist)
{
fdecl = TREE_VALUE (flist);
while (fdecl)
{
if (alter_access (t, fdecl, access) == 0)
break;
fdecl = DECL_CHAIN (fdecl);
}
}
else
alter_access (t, fdecl, access);
}
}
if (vfield == NULL_TREE && has_virtual)
{
/* We build this decl with ptr_type_node, and
change the type when we know what it should be. */
vfield = build_lang_field_decl (FIELD_DECL, get_vfield_name (t),
ptr_type_node);
/* If you change any of the below, take a look at all the
other VFIELD_BASEs and VTABLE_BASEs in the code, and change
them too. */
DECL_ASSEMBLER_NAME (vfield) = get_identifier (VFIELD_BASE);
CLASSTYPE_VFIELD (t) = vfield;
DECL_VIRTUAL_P (vfield) = 1;
DECL_FIELD_CONTEXT (vfield) = t;
DECL_CLASS_CONTEXT (vfield) = t;
DECL_FCONTEXT (vfield) = t;
DECL_SAVED_INSNS (vfield) = NULL_RTX;
DECL_FIELD_SIZE (vfield) = 0;
DECL_ALIGN (vfield) = TYPE_ALIGN (ptr_type_node);
if (CLASSTYPE_RTTI (t))
{
/* vfield is always first entry in structure. */
TREE_CHAIN (vfield) = fields;
fields = vfield;
}
else if (last_x)
{
my_friendly_assert (TREE_CHAIN (last_x) == NULL_TREE, 175);
TREE_CHAIN (last_x) = vfield;
last_x = vfield;
}
else
fields = vfield;
vfields = chainon (vfields, CLASSTYPE_AS_LIST (t));
}
/* Now DECL_INITIAL is null on all members except for zero-width bit-fields.
And they have already done their work.
C++: maybe we will support default field initialization some day... */
/* Delete all zero-width bit-fields from the front of the fieldlist */
while (fields && DECL_BIT_FIELD (fields)
&& DECL_INITIAL (fields))
fields = TREE_CHAIN (fields);
/* Delete all such fields from the rest of the fields. */
for (x = fields; x;)
{
if (TREE_CHAIN (x) && DECL_BIT_FIELD (TREE_CHAIN (x))
&& DECL_INITIAL (TREE_CHAIN (x)))
TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
else
x = TREE_CHAIN (x);
}
/* Delete all duplicate fields from the fields */
delete_duplicate_fields (fields);
/* Catch function/field name conflict. We don't need to do this for a
signature, since it can only contain the fields constructed in
append_signature_fields. */
if (! IS_SIGNATURE (t))
{
int n_methods = method_vec ? TREE_VEC_LENGTH (method_vec) : 0;
for (x = fields; x; x = TREE_CHAIN (x))
{
tree name = DECL_NAME (x);
int i = /*TREE_VEC_ELT (method_vec, 0) ? 0 : */ 1;
for (; i < n_methods; ++i)
if (DECL_NAME (TREE_VEC_ELT (method_vec, i)) == name)
{
cp_error_at ("data member `%#D' conflicts with", x);
cp_error_at ("function member `%#D'",
TREE_VEC_ELT (method_vec, i));
break;
}
}
}
/* Now we have the final fieldlist for the data fields. Record it,
then lay out the structure or union (including the fields). */
TYPE_FIELDS (t) = fields;
/* If there's a :0 field at the end, round the size to the
EMPTY_FIELD_BOUNDARY. */
TYPE_ALIGN (t) = round_up_size;
/* Pass layout information about base classes to layout_type, if any. */
if (n_baseclasses)
{
tree pseudo_basetype = TREE_TYPE (base_layout_decl);
TREE_CHAIN (base_layout_decl) = TYPE_FIELDS (t);
TYPE_FIELDS (t) = base_layout_decl;
TYPE_SIZE (pseudo_basetype) = CLASSTYPE_SIZE (t);
TYPE_MODE (pseudo_basetype) = TYPE_MODE (t);
TYPE_ALIGN (pseudo_basetype) = CLASSTYPE_ALIGN (t);
DECL_ALIGN (base_layout_decl) = TYPE_ALIGN (pseudo_basetype);
/* Don't re-use old size. */
DECL_SIZE (base_layout_decl) = NULL_TREE;
}
layout_type (t);
{
tree field;
for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
{
if (TREE_STATIC (field))
continue;
if (TREE_CODE (field) != FIELD_DECL)
continue;
/* If this field is an anonymous union,
give each union-member the same position as the union has.
??? This is a real kludge because it makes the structure
of the types look strange. This feature is only used by
C++, which should have build_component_ref build two
COMPONENT_REF operations, one for the union and one for
the inner field. We set the offset of this field to zero
so that either the old or the correct method will work.
Setting DECL_FIELD_CONTEXT is wrong unless the inner fields are
moved into the type of this field, but nothing seems to break
by doing this. */
if (DECL_NAME (field) == NULL_TREE
&& TREE_CODE (TREE_TYPE (field)) == UNION_TYPE)
{
tree uelt = TYPE_FIELDS (TREE_TYPE (field));
for (; uelt; uelt = TREE_CHAIN (uelt))
{
if (TREE_CODE (uelt) != FIELD_DECL)
continue;
if (TREE_PRIVATE (uelt))
cp_pedwarn_at ("private member `%#D' in anonymous union",
uelt);
else if (TREE_PROTECTED (uelt))
cp_pedwarn_at ("protected member `%#D' in anonymous union",
uelt);
DECL_FIELD_CONTEXT (uelt) = DECL_FIELD_CONTEXT (field);
DECL_FIELD_BITPOS (uelt) = DECL_FIELD_BITPOS (field);
}
DECL_FIELD_BITPOS (field) = integer_zero_node;
}
}
}
if (n_baseclasses)
TYPE_FIELDS (t) = TREE_CHAIN (TYPE_FIELDS (t));
/* C++: do not let empty structures exist. */
if (integer_zerop (TYPE_SIZE (t)))
TYPE_SIZE (t) = TYPE_SIZE (char_type_node);
/* Set the TYPE_DECL for this type to contain the right
value for DECL_OFFSET, so that we can use it as part
of a COMPONENT_REF for multiple inheritance. */
if (TREE_CODE (TYPE_NAME (t)) == TYPE_DECL)
layout_decl (TYPE_NAME (t), 0);
/* Now fix up any virtual base class types that we left lying
around. We must get these done before we try to lay out the
virtual function table. */
doing_hard_virtuals = 1;
pending_hard_virtuals = nreverse (pending_hard_virtuals);
if (TYPE_USES_VIRTUAL_BASECLASSES (t))
{
tree vbases;
max_has_virtual = layout_vbasetypes (t, max_has_virtual);
vbases = CLASSTYPE_VBASECLASSES (t);
CLASSTYPE_N_VBASECLASSES (t) = list_length (vbases);
/* The rtti code should do this. (mrs) */
#if 0
while (vbases)
{
/* Update rtti info with offsets for virtual baseclasses. */
if (flag_rtti && ! BINFO_NEW_VTABLE_MARKED (vbases))
prepare_fresh_vtable (vbases, t);
vbases = TREE_CHAIN (vbases);
}
#endif
{
/* Now fixup overrides of all functions in vtables from all
direct or indirect virtual base classes. */
tree binfos = BINFO_BASETYPES (TYPE_BINFO (t));
int i, n_baseclasses = binfos ? TREE_VEC_LENGTH (binfos) : 0;
for (i = 0; i < n_baseclasses; i++)
{
tree base_binfo = TREE_VEC_ELT (binfos, i);
tree basetype = BINFO_TYPE (base_binfo);
tree vbases;
vbases = CLASSTYPE_VBASECLASSES (basetype);
while (vbases)
{
merge_overrides (binfo_member (BINFO_TYPE (vbases),
CLASSTYPE_VBASECLASSES (t)),
vbases, 1, t);
vbases = TREE_CHAIN (vbases);
}
}
}
/* Now fixup any virtual function entries from virtual bases
that have different deltas. */
vbases = CLASSTYPE_VBASECLASSES (t);
while (vbases)
{
/* We might be able to shorten the amount of work we do by
only doing this for vtables that come from virtual bases
that have differing offsets, but don't want to miss any
entries. */
fixup_vtable_deltas (vbases, 1, t);
vbases = TREE_CHAIN (vbases);
}
}
/* Set up the DECL_FIELD_BITPOS of the vfield if we need to, as we
might need to know it for setting up the offsets in the vtable
(or in thunks) below. */
if (vfield != NULL_TREE
&& DECL_FIELD_CONTEXT (vfield) != t)
{
tree binfo = get_binfo (DECL_FIELD_CONTEXT (vfield), t, 0);
tree offset = BINFO_OFFSET (binfo);
vfield = copy_node (vfield);
copy_lang_decl (vfield);
if (! integer_zerop (offset))
offset = size_binop (MULT_EXPR, offset, size_int (BITS_PER_UNIT));
DECL_FIELD_CONTEXT (vfield) = t;
DECL_CLASS_CONTEXT (vfield) = t;
DECL_FIELD_BITPOS (vfield)
= size_binop (PLUS_EXPR, offset, DECL_FIELD_BITPOS (vfield));
CLASSTYPE_VFIELD (t) = vfield;
}
#ifdef NOTQUITE
cp_warning ("Doing hard virtuals for %T...", t);
#endif
if (has_virtual > max_has_virtual)
max_has_virtual = has_virtual;
if (max_has_virtual > 0)
TYPE_VIRTUAL_P (t) = 1;
if (flag_rtti && TYPE_VIRTUAL_P (t) && !pending_hard_virtuals)
modify_all_vtables (t, NULL_TREE, NULL_TREE);
while (pending_hard_virtuals)
{
modify_all_vtables (t,
TREE_PURPOSE (pending_hard_virtuals),
TREE_VALUE (pending_hard_virtuals));
pending_hard_virtuals = TREE_CHAIN (pending_hard_virtuals);
}
doing_hard_virtuals = 0;
/* Under our model of GC, every C++ class gets its own virtual
function table, at least virtually. */
if (pending_virtuals || (flag_rtti && TYPE_VIRTUAL_P (t)))
{
pending_virtuals = nreverse (pending_virtuals);
/* We must enter these virtuals into the table. */
if (first_vfn_base_index < 0)
{
/* The first slot is for the rtti offset. */
pending_virtuals = tree_cons (NULL_TREE, NULL_TREE, pending_virtuals);
/* The second slot is for the tdesc pointer when thunks are used. */
if (flag_vtable_thunks)
pending_virtuals = tree_cons (NULL_TREE, NULL_TREE, pending_virtuals);
set_rtti_entry (pending_virtuals, integer_zero_node, t);
build_vtable (NULL_TREE, t);
}
else
{
tree offset;
/* Here we know enough to change the type of our virtual
function table, but we will wait until later this function. */
if (! BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (t)))
build_vtable (TREE_VEC_ELT (TYPE_BINFO_BASETYPES (t), first_vfn_base_index), t);
offset = get_derived_offset (TYPE_BINFO (t), NULL_TREE);
offset = size_binop (MINUS_EXPR, integer_zero_node, offset);
set_rtti_entry (TYPE_BINFO_VIRTUALS (t), offset, t);
}
/* If this type has basetypes with constructors, then those
constructors might clobber the virtual function table. But
they don't if the derived class shares the exact vtable of the base
class. */
CLASSTYPE_NEEDS_VIRTUAL_REINIT (t) = 1;
}
else if (first_vfn_base_index >= 0)
{
tree binfo = TREE_VEC_ELT (TYPE_BINFO_BASETYPES (t), first_vfn_base_index);
/* This class contributes nothing new to the virtual function
table. However, it may have declared functions which
went into the virtual function table "inherited" from the
base class. If so, we grab a copy of those updated functions,
and pretend they are ours. */
/* See if we should steal the virtual info from base class. */
if (TYPE_BINFO_VTABLE (t) == NULL_TREE)
TYPE_BINFO_VTABLE (t) = BINFO_VTABLE (binfo);
if (TYPE_BINFO_VIRTUALS (t) == NULL_TREE)
TYPE_BINFO_VIRTUALS (t) = BINFO_VIRTUALS (binfo);
if (TYPE_BINFO_VTABLE (t) != BINFO_VTABLE (binfo))
CLASSTYPE_NEEDS_VIRTUAL_REINIT (t) = 1;
}
if (max_has_virtual || first_vfn_base_index >= 0)
{
CLASSTYPE_VSIZE (t) = has_virtual;
if (first_vfn_base_index >= 0)
{
if (pending_virtuals)
TYPE_BINFO_VIRTUALS (t) = chainon (TYPE_BINFO_VIRTUALS (t),
pending_virtuals);
}
else if (has_virtual)
{
TYPE_BINFO_VIRTUALS (t) = pending_virtuals;
if (write_virtuals >= 0)
DECL_VIRTUAL_P (TYPE_BINFO_VTABLE (t)) = 1;
}
}
/* Now lay out the virtual function table. */
if (has_virtual)
{
tree atype, itype;
if (TREE_TYPE (vfield) == ptr_type_node)
{
/* We must create a pointer to this table because
the one inherited from base class does not exist.
We will fill in the type when we know what it
should really be. Use `size_int' so values are memoized
in common cases. */
itype = build_index_type (size_int (has_virtual));
atype = build_array_type (vtable_entry_type, itype);
layout_type (atype);
TREE_TYPE (vfield) = build_pointer_type (atype);
}
else
{
atype = TREE_TYPE (TREE_TYPE (vfield));
if (has_virtual != TREE_INT_CST_LOW (TYPE_MAX_VALUE (TYPE_DOMAIN (atype))))
{
/* We must extend (or create) the boundaries on this array,
because we picked up virtual functions from multiple
base classes. */
itype = build_index_type (size_int (has_virtual));
atype = build_array_type (vtable_entry_type, itype);
layout_type (atype);
vfield = copy_node (vfield);
TREE_TYPE (vfield) = build_pointer_type (atype);
}
}
CLASSTYPE_VFIELD (t) = vfield;
if (TREE_TYPE (TYPE_BINFO_VTABLE (t)) != atype)
{
TREE_TYPE (TYPE_BINFO_VTABLE (t)) = atype;
DECL_SIZE (TYPE_BINFO_VTABLE (t)) = 0;
layout_decl (TYPE_BINFO_VTABLE (t), 0);
/* At one time the vtable info was grabbed 2 words at a time. This
fails on sparc unless you have 8-byte alignment. (tiemann) */
DECL_ALIGN (TYPE_BINFO_VTABLE (t))
= MAX (TYPE_ALIGN (double_type_node),
DECL_ALIGN (TYPE_BINFO_VTABLE (t)));
}
}
else if (first_vfn_base_index >= 0)
CLASSTYPE_VFIELD (t) = vfield;
CLASSTYPE_VFIELDS (t) = vfields;
finish_struct_bits (t, max_has_virtual);
/* Complete the rtl for any static member objects of the type we're
working on. */
for (x = fields; x; x = TREE_CHAIN (x))
{
if (TREE_CODE (x) == VAR_DECL && TREE_STATIC (x)
&& TREE_TYPE (x) == t)
{
DECL_MODE (x) = TYPE_MODE (t);
make_decl_rtl (x, NULL, 0);
}
}
/* Now add the tags, if any, to the list of TYPE_DECLs
defined for this type. */
if (CLASSTYPE_TAGS (t))
{
x = CLASSTYPE_TAGS (t);
last_x = tree_last (TYPE_FIELDS (t));
while (x)
{
tree tag = TYPE_NAME (TREE_VALUE (x));
/* Check to see if it is already there. This will be the case if
was do enum { red; } color; */
if (chain_member (tag, TYPE_FIELDS (t)))
{
x = TREE_CHAIN (x);
continue;
}
#ifdef DWARF_DEBUGGING_INFO
if (write_symbols == DWARF_DEBUG)
{
/* Notify dwarfout.c that this TYPE_DECL node represent a
gratuitous typedef. */
DECL_IGNORED_P (tag) = 1;
}
#endif /* DWARF_DEBUGGING_INFO */
TREE_NONLOCAL_FLAG (TREE_VALUE (x)) = 0;
x = TREE_CHAIN (x);
last_x = chainon (last_x, tag);
}
if (TYPE_FIELDS (t) == NULL_TREE)
TYPE_FIELDS (t) = last_x;
CLASSTYPE_LOCAL_TYPEDECLS (t) = 1;
}
if (TYPE_HAS_CONSTRUCTOR (t))
{
tree vfields = CLASSTYPE_VFIELDS (t);
while (vfields)
{
/* Mark the fact that constructor for T
could affect anybody inheriting from T
who wants to initialize vtables for VFIELDS's type. */
if (VF_DERIVED_VALUE (vfields))
TREE_ADDRESSABLE (vfields) = 1;
vfields = TREE_CHAIN (vfields);
}
if (any_default_members != 0)
build_class_init_list (t);
}
else if (TYPE_NEEDS_CONSTRUCTING (t))
build_class_init_list (t);
if (! IS_SIGNATURE (t))
embrace_waiting_friends (t);
/* Write out inline function definitions. */
do_inline_function_hair (t, CLASSTYPE_INLINE_FRIENDS (t));
CLASSTYPE_INLINE_FRIENDS (t) = 0;
if (CLASSTYPE_VSIZE (t) != 0)
{
#if 0
/* This is now done above. */
if (DECL_FIELD_CONTEXT (vfield) != t)
{
tree binfo = get_binfo (DECL_FIELD_CONTEXT (vfield), t, 0);
tree offset = BINFO_OFFSET (binfo);
vfield = copy_node (vfield);
copy_lang_decl (vfield);
if (! integer_zerop (offset))
offset = size_binop (MULT_EXPR, offset, size_int (BITS_PER_UNIT));
DECL_FIELD_CONTEXT (vfield) = t;
DECL_CLASS_CONTEXT (vfield) = t;
DECL_FIELD_BITPOS (vfield)
= size_binop (PLUS_EXPR, offset, DECL_FIELD_BITPOS (vfield));
CLASSTYPE_VFIELD (t) = vfield;
}
#endif
/* In addition to this one, all the other vfields should be listed. */
/* Before that can be done, we have to have FIELD_DECLs for them, and
a place to find them. */
TYPE_NONCOPIED_PARTS (t) = build_tree_list (default_conversion (TYPE_BINFO_VTABLE (t)), vfield);
if (warn_nonvdtor && TYPE_HAS_DESTRUCTOR (t)
&& DECL_VINDEX (TREE_VEC_ELT (method_vec, 0)) == NULL_TREE)
cp_warning ("`%#T' has virtual functions but non-virtual destructor",
t);
}
/* Make the rtl for any new vtables we have created, and unmark
the base types we marked. */
finish_vtbls (TYPE_BINFO (t), 1, t);
TYPE_BEING_DEFINED (t) = 0;
hack_incomplete_structures (t);
#if 0
if (TYPE_NAME (t) && TYPE_IDENTIFIER (t))
undo_template_name_overload (TYPE_IDENTIFIER (t), 1);
#endif
if (current_class_type)
popclass (0);
else
error ("trying to finish struct, but kicked out due to previous parse errors.");
resume_momentary (old);
if (flag_cadillac)
cadillac_finish_struct (t);
#if 0
/* This has to be done after we have sorted out what to do with
the enclosing type. */
if (write_symbols != DWARF_DEBUG)
{
/* Be smarter about nested classes here. If a type is nested,
only output it if we would output the enclosing type. */
if (DECL_CONTEXT (TYPE_NAME (t))
&& TREE_CODE_CLASS (TREE_CODE (DECL_CONTEXT (TYPE_NAME (t)))) == 't')
DECL_IGNORED_P (TYPE_NAME (t)) = TREE_ASM_WRITTEN (TYPE_NAME (t));
}
#endif
if (write_symbols != DWARF_DEBUG)
{
/* If the type has methods, we want to think about cutting down
the amount of symbol table stuff we output. The value stored in
the TYPE_DECL's DECL_IGNORED_P slot is a first approximation.
For example, if a member function is seen and we decide to
write out that member function, then we can change the value
of the DECL_IGNORED_P slot, and the type will be output when
that member function's debug info is written out. */
if (CLASSTYPE_METHOD_VEC (t))
{
extern tree pending_vtables;
/* Don't output full info about any type
which does not have its implementation defined here. */
if (TYPE_VIRTUAL_P (t) && write_virtuals == 2)
TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (t))
= (value_member (TYPE_IDENTIFIER (t), pending_vtables) == 0);
else if (CLASSTYPE_INTERFACE_ONLY (t))
TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (t)) = 1;
else if (CLASSTYPE_INTERFACE_UNKNOWN (t))
/* Only a first approximation! */
TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (t)) = 1;
}
else if (CLASSTYPE_INTERFACE_ONLY (t))
TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (t)) = 1;
}
/* Finish debugging output for this type. */
rest_of_type_compilation (t, toplevel_bindings_p ());
return t;
}
tree
finish_struct (t, list_of_fieldlists, warn_anon)
tree t;
tree list_of_fieldlists;
int warn_anon;
{
tree fields = NULL_TREE, fn_fields, *tail;
tree *tail_user_methods = &CLASSTYPE_METHODS (t);
tree name = TYPE_NAME (t);
tree x, last_x = NULL_TREE;
enum access_type access;
if (TREE_CODE (name) == TYPE_DECL)
{
extern int lineno;
DECL_SOURCE_FILE (name) = input_filename;
/* For TYPE_DECL that are not typedefs (those marked with a line
number of zero, we don't want to mark them as real typedefs.
If this fails one needs to make sure real typedefs have a
previous line number, even if it is wrong, that way the below
will fill in the right line number. (mrs) */
if (DECL_SOURCE_LINE (name))
DECL_SOURCE_LINE (name) = lineno;
CLASSTYPE_SOURCE_LINE (t) = lineno;
name = DECL_NAME (name);
}
/* Append the fields we need for constructing signature tables. */
if (IS_SIGNATURE (t))
append_signature_fields (list_of_fieldlists);
tail = &fn_fields;
if (last_x && list_of_fieldlists)
TREE_CHAIN (last_x) = TREE_VALUE (list_of_fieldlists);
/* For signatures, we made all methods `public' in the parser and
reported an error if a access specifier was used. */
if (CLASSTYPE_DECLARED_CLASS (t) == 0)
{
if (list_of_fieldlists
&& TREE_PURPOSE (list_of_fieldlists) == (tree)access_default)
TREE_PURPOSE (list_of_fieldlists) = (tree)access_public;
}
else if (list_of_fieldlists
&& TREE_PURPOSE (list_of_fieldlists) == (tree)access_default)
TREE_PURPOSE (list_of_fieldlists) = (tree)access_private;
while (list_of_fieldlists)
{
access = (enum access_type)TREE_PURPOSE (list_of_fieldlists);
for (x = TREE_VALUE (list_of_fieldlists); x; x = TREE_CHAIN (x))
{
TREE_PRIVATE (x) = access == access_private;
TREE_PROTECTED (x) = access == access_protected;
/* Check for inconsistent use of this name in the class body.
Enums, types and static vars have already been checked. */
if (TREE_CODE (x) != TYPE_DECL
&& TREE_CODE (x) != CONST_DECL && TREE_CODE (x) != VAR_DECL)
{
tree name = DECL_NAME (x);
tree icv;
/* Don't get confused by access decls. */
if (name && TREE_CODE (name) == IDENTIFIER_NODE)
icv = IDENTIFIER_CLASS_VALUE (name);
else
icv = NULL_TREE;
if (icv
/* Don't complain about constructors. */
&& name != constructor_name (current_class_type)
/* Or inherited names. */
&& id_in_current_class (name)
/* Or shadowed tags. */
&& !(TREE_CODE (icv) == TYPE_DECL
&& DECL_CONTEXT (icv) == t))
{
cp_error_at ("declaration of identifier `%D' as `%+#D'",
name, x);
cp_error_at ("conflicts with other use in class as `%#D'",
icv);
}
}
if (TREE_CODE (x) == FUNCTION_DECL)
{
if (last_x)
TREE_CHAIN (last_x) = TREE_CHAIN (x);
/* Link x onto end of fn_fields and CLASSTYPE_METHODS. */
*tail = x;
tail = &TREE_CHAIN (x);
*tail_user_methods = x;
tail_user_methods = &DECL_NEXT_METHOD (x);
continue;
}
#if 0
/* Handle access declarations. */
if (DECL_NAME (x) && TREE_CODE (DECL_NAME (x)) == SCOPE_REF)
{
tree n = DECL_NAME (x);
x = build_decl
(USING_DECL, DECL_NAME (TREE_OPERAND (n, 1)), TREE_TYPE (x));
DECL_RESULT (x) = n;
}
#endif
if (! fields)
fields = x;
last_x = x;
}
list_of_fieldlists = TREE_CHAIN (list_of_fieldlists);
/* link the tail while we have it! */
if (last_x)
{
TREE_CHAIN (last_x) = NULL_TREE;
if (list_of_fieldlists
&& TREE_VALUE (list_of_fieldlists)
&& TREE_CODE (TREE_VALUE (list_of_fieldlists)) != FUNCTION_DECL)
TREE_CHAIN (last_x) = TREE_VALUE (list_of_fieldlists);
}
}
*tail = NULL_TREE;
*tail_user_methods = NULL_TREE;
TYPE_FIELDS (t) = fields;
if (0 && processing_template_defn)
{
CLASSTYPE_METHOD_VEC (t) = finish_struct_methods (t, fn_fields, 1);
return t;
}
else
return finish_struct_1 (t, warn_anon);
}
/* Return non-zero if the effective type of INSTANCE is static.
Used to determine whether the virtual function table is needed
or not.
*NONNULL is set iff INSTANCE can be known to be nonnull, regardless
of our knowledge of its type. */
int
resolves_to_fixed_type_p (instance, nonnull)
tree instance;
int *nonnull;
{
switch (TREE_CODE (instance))
{
case INDIRECT_REF:
/* Check that we are not going through a cast of some sort. */
if (TREE_TYPE (instance)
== TREE_TYPE (TREE_TYPE (TREE_OPERAND (instance, 0))))
instance = TREE_OPERAND (instance, 0);
/* fall through... */
case CALL_EXPR:
/* This is a call to a constructor, hence it's never zero. */
if (TREE_HAS_CONSTRUCTOR (instance))
{
if (nonnull)
*nonnull = 1;
return 1;
}
return 0;
case SAVE_EXPR:
/* This is a call to a constructor, hence it's never zero. */
if (TREE_HAS_CONSTRUCTOR (instance))
{
if (nonnull)
*nonnull = 1;
return 1;
}
return resolves_to_fixed_type_p (TREE_OPERAND (instance, 0), nonnull);
case RTL_EXPR:
/* This is a call to `new', hence it's never zero. */
if (TREE_CALLS_NEW (instance))
{
if (nonnull)
*nonnull = 1;
return 1;
}
return 0;
case PLUS_EXPR:
case MINUS_EXPR:
if (TREE_CODE (TREE_OPERAND (instance, 1)) == INTEGER_CST)
/* Propagate nonnull. */
resolves_to_fixed_type_p (TREE_OPERAND (instance, 0), nonnull);
if (TREE_CODE (TREE_OPERAND (instance, 0)) == ADDR_EXPR)
return resolves_to_fixed_type_p (TREE_OPERAND (instance, 0), nonnull);
return 0;
case NOP_EXPR:
case CONVERT_EXPR:
return resolves_to_fixed_type_p (TREE_OPERAND (instance, 0), nonnull);
case ADDR_EXPR:
if (nonnull)
*nonnull = 1;
return resolves_to_fixed_type_p (TREE_OPERAND (instance, 0), nonnull);
case COMPONENT_REF:
return resolves_to_fixed_type_p (TREE_OPERAND (instance, 1), nonnull);
case WITH_CLEANUP_EXPR:
if (TREE_CODE (TREE_OPERAND (instance, 0)) == ADDR_EXPR)
return resolves_to_fixed_type_p (TREE_OPERAND (instance, 0), nonnull);
/* fall through... */
case VAR_DECL:
case FIELD_DECL:
if (TREE_CODE (TREE_TYPE (instance)) == ARRAY_TYPE
&& IS_AGGR_TYPE (TREE_TYPE (TREE_TYPE (instance))))
{
if (nonnull)
*nonnull = 1;
return 1;
}
/* fall through... */
case TARGET_EXPR:
case PARM_DECL:
if (IS_AGGR_TYPE (TREE_TYPE (instance)))
{
if (nonnull)
*nonnull = 1;
return 1;
}
else if (nonnull)
{
if (instance == current_class_decl
&& flag_this_is_variable <= 0)
{
/* Some people still use `this = 0' inside destructors. */
*nonnull = ! DESTRUCTOR_NAME_P (DECL_ASSEMBLER_NAME (current_function_decl));
/* In a constructor, we know our type. */
if (flag_this_is_variable < 0)
return 1;
}
else if (TREE_CODE (TREE_TYPE (instance)) == REFERENCE_TYPE)
/* Reference variables should be references to objects. */
*nonnull = 1;
}
return 0;
default:
return 0;
}
}
void
init_class_processing ()
{
current_class_depth = 0;
current_class_stacksize = 10;
current_class_base = (tree *)xmalloc(current_class_stacksize * sizeof (tree));
current_class_stack = current_class_base;
current_lang_stacksize = 10;
current_lang_base = (tree *)xmalloc(current_lang_stacksize * sizeof (tree));
current_lang_stack = current_lang_base;
/* Keep these values lying around. */
the_null_vtable_entry = build_vtable_entry (integer_zero_node, integer_zero_node);
base_layout_decl = build_lang_field_decl (FIELD_DECL, NULL_TREE, error_mark_node);
TREE_TYPE (base_layout_decl) = make_node (RECORD_TYPE);
gcc_obstack_init (&class_obstack);
}
/* Set current scope to NAME. CODE tells us if this is a
STRUCT, UNION, or ENUM environment.
NAME may end up being NULL_TREE if this is an anonymous or
late-bound struct (as in "struct { ... } foo;") */
/* Set global variables CURRENT_CLASS_NAME and CURRENT_CLASS_TYPE to
appropriate values, found by looking up the type definition of
NAME (as a CODE).
If MODIFY is 1, we set IDENTIFIER_CLASS_VALUE's of names
which can be seen locally to the class. They are shadowed by
any subsequent local declaration (including parameter names).
If MODIFY is 2, we set IDENTIFIER_CLASS_VALUE's of names
which have static meaning (i.e., static members, static
member functions, enum declarations, etc).
If MODIFY is 3, we set IDENTIFIER_CLASS_VALUE of names
which can be seen locally to the class (as in 1), but
know that we are doing this for declaration purposes
(i.e. friend foo::bar (int)).
So that we may avoid calls to lookup_name, we cache the _TYPE
nodes of local TYPE_DECLs in the TREE_TYPE field of the name.
For multiple inheritance, we perform a two-pass depth-first search
of the type lattice. The first pass performs a pre-order search,
marking types after the type has had its fields installed in
the appropriate IDENTIFIER_CLASS_VALUE slot. The second pass merely
unmarks the marked types. If a field or member function name
appears in an ambiguous way, the IDENTIFIER_CLASS_VALUE of
that name becomes `error_mark_node'. */
void
pushclass (type, modify)
tree type;
int modify;
{
push_memoized_context (type, modify);
current_class_depth++;
*current_class_stack++ = current_class_name;
*current_class_stack++ = current_class_type;
if (current_class_stack >= current_class_base + current_class_stacksize)
{
current_class_base =
(tree *)xrealloc (current_class_base,
sizeof (tree) * (current_class_stacksize + 10));
current_class_stack = current_class_base + current_class_stacksize;
current_class_stacksize += 10;
}
current_class_name = TYPE_NAME (type);
if (TREE_CODE (current_class_name) == TYPE_DECL)
current_class_name = DECL_NAME (current_class_name);
current_class_type = type;
if (previous_class_type != NULL_TREE
&& (type != previous_class_type || TYPE_SIZE (previous_class_type) == NULL_TREE)
&& current_class_depth == 1)
{
/* Forcibly remove any old class remnants. */
popclass (-1);
previous_class_type = NULL_TREE;
}
pushlevel_class ();
if (modify)
{
tree tags;
tree this_fndecl = current_function_decl;
if (current_function_decl
&& DECL_CONTEXT (current_function_decl)
&& TREE_CODE (DECL_CONTEXT (current_function_decl)) == FUNCTION_DECL)
current_function_decl = DECL_CONTEXT (current_function_decl);
else
current_function_decl = NULL_TREE;
if (TREE_CODE (type) == UNINSTANTIATED_P_TYPE)
declare_uninstantiated_type_level ();
else if (type != previous_class_type || current_class_depth > 1)
{
build_mi_matrix (type);
push_class_decls (type);
free_mi_matrix ();
if (current_class_depth == 1)
previous_class_type = type;
}
else
{
tree item;
/* Hooray, we successfully cached; let's just install the
cached class_shadowed list, and walk through it to get the
IDENTIFIER_TYPE_VALUEs correct. */
set_class_shadows (previous_class_values);
for (item = previous_class_values; item; item = TREE_CHAIN (item))
{
tree id = TREE_PURPOSE (item);
tree decl = IDENTIFIER_CLASS_VALUE (id);
if (TREE_CODE (decl) == TYPE_DECL)
set_identifier_type_value (id, TREE_TYPE (decl));
}
unuse_fields (type);
}
if (IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (type)))
overload_template_name (current_class_name, 0);
for (tags = CLASSTYPE_TAGS (type); tags; tags = TREE_CHAIN (tags))
{
TREE_NONLOCAL_FLAG (TREE_VALUE (tags)) = 1;
if (! TREE_PURPOSE (tags))
continue;
pushtag (TREE_PURPOSE (tags), TREE_VALUE (tags), 0);
}
current_function_decl = this_fndecl;
}
if (flag_cadillac)
cadillac_push_class (type);
}
/* Get out of the current class scope. If we were in a class scope
previously, that is the one popped to. The flag MODIFY tells whether
the current scope declarations needs to be modified as a result of
popping to the previous scope. 0 is used for class definitions. */
void
popclass (modify)
int modify;
{
if (flag_cadillac)
cadillac_pop_class ();
if (modify < 0)
{
/* Back this old class out completely. */
tree tags = CLASSTYPE_TAGS (previous_class_type);
tree t;
/* This code can be seen as a cache miss. When we've cached a
class' scope's bindings and we can't use them, we need to reset
them. This is it! */
for (t = previous_class_values; t; t = TREE_CHAIN (t))
IDENTIFIER_CLASS_VALUE (TREE_PURPOSE (t)) = NULL_TREE;
while (tags)
{
TREE_NONLOCAL_FLAG (TREE_VALUE (tags)) = 0;
tags = TREE_CHAIN (tags);
}
goto ret;
}
if (modify)
{
/* Just remove from this class what didn't make
it into IDENTIFIER_CLASS_VALUE. */
tree tags = CLASSTYPE_TAGS (current_class_type);
while (tags)
{
TREE_NONLOCAL_FLAG (TREE_VALUE (tags)) = 0;
tags = TREE_CHAIN (tags);
}
if (IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type)))
undo_template_name_overload (current_class_name, 0);
}
/* Force clearing of IDENTIFIER_CLASS_VALUEs after a class definition,
since not all class decls make it there currently. */
poplevel_class (! modify);
/* Since poplevel_class does the popping of class decls nowadays,
this really only frees the obstack used for these decls.
That's why it had to be moved down here. */
if (modify)
pop_class_decls (current_class_type);
current_class_depth--;
current_class_type = *--current_class_stack;
current_class_name = *--current_class_stack;
pop_memoized_context (modify);
ret:
;
}
/* When entering a class scope, all enclosing class scopes' names with
static meaning (static variables, static functions, types and enumerators)
have to be visible. This recursive function calls pushclass for all
enclosing class contexts until global or a local scope is reached.
TYPE is the enclosed class and MODIFY is equivalent with the pushclass
formal of the same name. */
void
push_nested_class (type, modify)
tree type;
int modify;
{
tree context;
if (type == NULL_TREE || type == error_mark_node || ! IS_AGGR_TYPE (type))
return;
context = DECL_CONTEXT (TYPE_NAME (type));
if (context && TREE_CODE (context) == RECORD_TYPE)
push_nested_class (context, 2);
pushclass (type, modify);
}
/* Undoes a push_nested_class call. MODIFY is passed on to popclass. */
void
pop_nested_class (modify)
int modify;
{
tree context = DECL_CONTEXT (TYPE_NAME (current_class_type));
popclass (modify);
if (context && TREE_CODE (context) == RECORD_TYPE)
pop_nested_class (modify);
}
/* Set global variables CURRENT_LANG_NAME to appropriate value
so that behavior of name-mangling machinery is correct. */
void
push_lang_context (name)
tree name;
{
*current_lang_stack++ = current_lang_name;
if (current_lang_stack >= current_lang_base + current_lang_stacksize)
{
current_lang_base =
(tree *)xrealloc (current_lang_base,
sizeof (tree) * (current_lang_stacksize + 10));
current_lang_stack = current_lang_base + current_lang_stacksize;
current_lang_stacksize += 10;
}
if (name == lang_name_cplusplus)
{
strict_prototype = strict_prototypes_lang_cplusplus;
current_lang_name = name;
}
else if (name == lang_name_c)
{
strict_prototype = strict_prototypes_lang_c;
current_lang_name = name;
}
else
error ("language string `\"%s\"' not recognized", IDENTIFIER_POINTER (name));
if (flag_cadillac)
cadillac_push_lang (name);
}
/* Get out of the current language scope. */
void
pop_lang_context ()
{
if (flag_cadillac)
cadillac_pop_lang ();
current_lang_name = *--current_lang_stack;
if (current_lang_name == lang_name_cplusplus)
strict_prototype = strict_prototypes_lang_cplusplus;
else if (current_lang_name == lang_name_c)
strict_prototype = strict_prototypes_lang_c;
}
int
root_lang_context_p ()
{
return current_lang_stack == current_lang_base;
}
/* Type instantiation routines. */
/* This function will instantiate the type of the expression given
in RHS to match the type of LHSTYPE. If LHSTYPE is NULL_TREE,
or other errors exist, the TREE_TYPE of RHS will be ERROR_MARK_NODE.
This function is used in build_modify_expr, convert_arguments,
build_c_cast, and compute_conversion_costs. */
tree
instantiate_type (lhstype, rhs, complain)
tree lhstype, rhs;
int complain;
{
if (TREE_CODE (lhstype) == UNKNOWN_TYPE)
{
if (complain)
error ("not enough type information");
return error_mark_node;
}
if (TREE_TYPE (rhs) != NULL_TREE && ! (type_unknown_p (rhs)))
return rhs;
/* This should really only be used when attempting to distinguish
what sort of a pointer to function we have. For now, any
arithmetic operation which is not supported on pointers
is rejected as an error. */
switch (TREE_CODE (rhs))
{
case TYPE_EXPR:
case CONVERT_EXPR:
case SAVE_EXPR:
case CONSTRUCTOR:
case BUFFER_REF:
my_friendly_abort (177);
return error_mark_node;
case INDIRECT_REF:
case ARRAY_REF:
TREE_TYPE (rhs) = lhstype;
lhstype = build_pointer_type (lhstype);
TREE_OPERAND (rhs, 0)
= instantiate_type (lhstype, TREE_OPERAND (rhs, 0), complain);
if (TREE_OPERAND (rhs, 0) == error_mark_node)
return error_mark_node;
return rhs;
case NOP_EXPR:
rhs = copy_node (TREE_OPERAND (rhs, 0));
TREE_TYPE (rhs) = unknown_type_node;
return instantiate_type (lhstype, rhs, complain);
case COMPONENT_REF:
{
tree field = TREE_OPERAND (rhs, 1);
if (TREE_CODE (field) == TREE_LIST)
{
tree function = instantiate_type (lhstype, field, complain);
if (function == error_mark_node)
return error_mark_node;
my_friendly_assert (TREE_CODE (function) == FUNCTION_DECL, 185);
if (DECL_VINDEX (function))
{
tree base = TREE_OPERAND (rhs, 0);
tree base_ptr = build_unary_op (ADDR_EXPR, base, 0);
if (base_ptr == error_mark_node)
return error_mark_node;
base_ptr = convert_pointer_to (DECL_CONTEXT (function), base_ptr);
if (base_ptr == error_mark_node)
return error_mark_node;
return build_vfn_ref (&base_ptr, base, DECL_VINDEX (function));
}
return function;
}
my_friendly_assert (TREE_CODE (field) == FIELD_DECL, 178);
my_friendly_assert (!(TREE_CODE (TREE_TYPE (field)) == FUNCTION_TYPE
|| TREE_CODE (TREE_TYPE (field)) == METHOD_TYPE),
179);
TREE_TYPE (rhs) = lhstype;
/* First look for an exact match */
while (field && TREE_TYPE (field) != lhstype)
field = DECL_CHAIN (field);
if (field)
{
TREE_OPERAND (rhs, 1) = field;
return rhs;
}
/* No exact match found, look for a compatible function. */
field = TREE_OPERAND (rhs, 1);
while (field && ! comptypes (lhstype, TREE_TYPE (field), 0))
field = DECL_CHAIN (field);
if (field)
{
TREE_OPERAND (rhs, 1) = field;
field = DECL_CHAIN (field);
while (field && ! comptypes (lhstype, TREE_TYPE (field), 0))
field = DECL_CHAIN (field);
if (field)
{
if (complain)
error ("ambiguous overload for COMPONENT_REF requested");
return error_mark_node;
}
}
else
{
if (complain)
error ("no appropriate overload exists for COMPONENT_REF");
return error_mark_node;
}
return rhs;
}
case TREE_LIST:
{
tree elem, baselink, name;
int globals = overloaded_globals_p (rhs);
#if 0 /* obsolete */
/* If there's only one function we know about, return that. */
if (globals > 0 && TREE_CHAIN (rhs) == NULL_TREE)
return TREE_VALUE (rhs);
#endif
/* First look for an exact match. Search either overloaded
functions or member functions. May have to undo what
`default_conversion' might do to lhstype. */
if (TYPE_PTRMEMFUNC_P (lhstype))
lhstype = TYPE_PTRMEMFUNC_FN_TYPE (lhstype);
if (TREE_CODE (lhstype) == POINTER_TYPE)
if (TREE_CODE (TREE_TYPE (lhstype)) == FUNCTION_TYPE
|| TREE_CODE (TREE_TYPE (lhstype)) == METHOD_TYPE)
lhstype = TREE_TYPE (lhstype);
else
{
if (complain)
error ("invalid type combination for overload");
return error_mark_node;
}
if (TREE_CODE (lhstype) != FUNCTION_TYPE && globals > 0)
{
if (complain)
cp_error ("cannot resolve overloaded function `%D' based on non-function type",
TREE_PURPOSE (rhs));
return error_mark_node;
}
if (globals > 0)
{
elem = get_first_fn (rhs);
while (elem)
if (! comptypes (lhstype, TREE_TYPE (elem), 1))
elem = DECL_CHAIN (elem);
else
return elem;
/* No exact match found, look for a compatible template. */
{
tree save_elem = 0;
for (elem = get_first_fn (rhs); elem; elem = DECL_CHAIN (elem))
if (TREE_CODE (elem) == TEMPLATE_DECL)
{
int n = TREE_VEC_LENGTH (DECL_TEMPLATE_PARMS (elem));
tree *t = (tree *) alloca (sizeof (tree) * n);
int i, d = 0;
i = type_unification (DECL_TEMPLATE_PARMS (elem), t,
TYPE_ARG_TYPES (TREE_TYPE (elem)),
TYPE_ARG_TYPES (lhstype), &d, 0);
if (i == 0)
{
if (save_elem)
{
cp_error ("ambiguous template instantiation converting to `%#T'", lhstype);
return error_mark_node;
}
save_elem = instantiate_template (elem, t);
/* Check the return type. */
if (! comptypes (TREE_TYPE (lhstype),
TREE_TYPE (TREE_TYPE (save_elem)), 1))
save_elem = 0;
}
}
if (save_elem)
return save_elem;
}
/* No match found, look for a compatible function. */
elem = get_first_fn (rhs);
while (elem && comp_target_types (lhstype,
TREE_TYPE (elem), 1) <= 0)
elem = DECL_CHAIN (elem);
if (elem)
{
tree save_elem = elem;
elem = DECL_CHAIN (elem);
while (elem && comp_target_types (lhstype,
TREE_TYPE (elem), 0) <= 0)
elem = DECL_CHAIN (elem);
if (elem)
{
if (complain)
{
cp_error ("cannot resolve overload to target type `%#T'",
lhstype);
cp_error_at (" ambiguity between `%#D'", save_elem);
cp_error_at (" and `%#D', at least", elem);
}
return error_mark_node;
}
return save_elem;
}
if (complain)
{
cp_error ("cannot resolve overload to target type `%#T'",
lhstype);
cp_error (" because no suitable overload of function `%D' exists",
TREE_PURPOSE (rhs));
}
return error_mark_node;
}
if (TREE_NONLOCAL_FLAG (rhs))
{
/* Got to get it as a baselink. */
rhs = lookup_fnfields (TYPE_BINFO (current_class_type),
TREE_PURPOSE (rhs), 0);
}
else
{
my_friendly_assert (TREE_CHAIN (rhs) == NULL_TREE, 181);
if (TREE_CODE (TREE_VALUE (rhs)) == TREE_LIST)
rhs = TREE_VALUE (rhs);
my_friendly_assert (TREE_CODE (TREE_VALUE (rhs)) == FUNCTION_DECL,
182);
}
for (baselink = rhs; baselink;
baselink = next_baselink (baselink))
{
elem = TREE_VALUE (baselink);
while (elem)
if (comptypes (lhstype, TREE_TYPE (elem), 1))
return elem;
else
elem = DECL_CHAIN (elem);
}
/* No exact match found, look for a compatible method. */
for (baselink = rhs; baselink;
baselink = next_baselink (baselink))
{
elem = TREE_VALUE (baselink);
while (elem && comp_target_types (lhstype,
TREE_TYPE (elem), 1) <= 0)
elem = DECL_CHAIN (elem);
if (elem)
{
tree save_elem = elem;
elem = DECL_CHAIN (elem);
while (elem && comp_target_types (lhstype,
TREE_TYPE (elem), 0) <= 0)
elem = DECL_CHAIN (elem);
if (elem)
{
if (complain)
error ("ambiguous overload for overloaded method requested");
return error_mark_node;
}
return save_elem;
}
name = DECL_NAME (TREE_VALUE (rhs));
#if 0
if (TREE_CODE (lhstype) == FUNCTION_TYPE && globals < 0)
{
/* Try to instantiate from non-member functions. */
rhs = lookup_name_nonclass (name);
if (rhs && TREE_CODE (rhs) == TREE_LIST)
{
/* This code seems to be missing a `return'. */
my_friendly_abort (4);
instantiate_type (lhstype, rhs, complain);
}
}
#endif
}
if (complain)
cp_error ("no compatible member functions named `%D'", name);
return error_mark_node;
}
case CALL_EXPR:
/* This is too hard for now. */
my_friendly_abort (183);
return error_mark_node;
case PLUS_EXPR:
case MINUS_EXPR:
case COMPOUND_EXPR:
TREE_OPERAND (rhs, 0)
= instantiate_type (lhstype, TREE_OPERAND (rhs, 0), complain);
if (TREE_OPERAND (rhs, 0) == error_mark_node)
return error_mark_node;
TREE_OPERAND (rhs, 1)
= instantiate_type (lhstype, TREE_OPERAND (rhs, 1), complain);
if (TREE_OPERAND (rhs, 1) == error_mark_node)
return error_mark_node;
TREE_TYPE (rhs) = lhstype;
return rhs;
case MULT_EXPR:
case TRUNC_DIV_EXPR:
case FLOOR_DIV_EXPR:
case CEIL_DIV_EXPR:
case ROUND_DIV_EXPR:
case RDIV_EXPR:
case TRUNC_MOD_EXPR:
case FLOOR_MOD_EXPR:
case CEIL_MOD_EXPR:
case ROUND_MOD_EXPR:
case FIX_ROUND_EXPR:
case FIX_FLOOR_EXPR:
case FIX_CEIL_EXPR:
case FIX_TRUNC_EXPR:
case FLOAT_EXPR:
case NEGATE_EXPR:
case ABS_EXPR:
case MAX_EXPR:
case MIN_EXPR:
case FFS_EXPR:
case BIT_AND_EXPR:
case BIT_IOR_EXPR:
case BIT_XOR_EXPR:
case LSHIFT_EXPR:
case RSHIFT_EXPR:
case LROTATE_EXPR:
case RROTATE_EXPR:
case PREINCREMENT_EXPR:
case PREDECREMENT_EXPR:
case POSTINCREMENT_EXPR:
case POSTDECREMENT_EXPR:
if (complain)
error ("invalid operation on uninstantiated type");
return error_mark_node;
case TRUTH_AND_EXPR:
case TRUTH_OR_EXPR:
case TRUTH_XOR_EXPR:
case LT_EXPR:
case LE_EXPR:
case GT_EXPR:
case GE_EXPR:
case EQ_EXPR:
case NE_EXPR:
case TRUTH_ANDIF_EXPR:
case TRUTH_ORIF_EXPR:
case TRUTH_NOT_EXPR:
if (complain)
error ("not enough type information");
return error_mark_node;
case COND_EXPR:
if (type_unknown_p (TREE_OPERAND (rhs, 0)))
{
if (complain)
error ("not enough type information");
return error_mark_node;
}
TREE_OPERAND (rhs, 1)
= instantiate_type (lhstype, TREE_OPERAND (rhs, 1), complain);
if (TREE_OPERAND (rhs, 1) == error_mark_node)
return error_mark_node;
TREE_OPERAND (rhs, 2)
= instantiate_type (lhstype, TREE_OPERAND (rhs, 2), complain);
if (TREE_OPERAND (rhs, 2) == error_mark_node)
return error_mark_node;
TREE_TYPE (rhs) = lhstype;
return rhs;
case MODIFY_EXPR:
TREE_OPERAND (rhs, 1)
= instantiate_type (lhstype, TREE_OPERAND (rhs, 1), complain);
if (TREE_OPERAND (rhs, 1) == error_mark_node)
return error_mark_node;
TREE_TYPE (rhs) = lhstype;
return rhs;
case ADDR_EXPR:
if (TYPE_PTRMEMFUNC_P (lhstype))
lhstype = TYPE_PTRMEMFUNC_FN_TYPE (lhstype);
else if (TREE_CODE (lhstype) != POINTER_TYPE)
{
if (complain)
error ("type for resolving address of overloaded function must be pointer type");
return error_mark_node;
}
TREE_TYPE (rhs) = lhstype;
lhstype = TREE_TYPE (lhstype);
{
tree fn = instantiate_type (lhstype, TREE_OPERAND (rhs, 0), complain);
if (fn == error_mark_node)
return error_mark_node;
mark_addressable (fn);
TREE_OPERAND (rhs, 0) = fn;
TREE_CONSTANT (rhs) = staticp (fn);
}
return rhs;
case ENTRY_VALUE_EXPR:
my_friendly_abort (184);
return error_mark_node;
case ERROR_MARK:
return error_mark_node;
default:
my_friendly_abort (185);
return error_mark_node;
}
}
/* Return the name of the virtual function pointer field
(as an IDENTIFIER_NODE) for the given TYPE. Note that
this may have to look back through base types to find the
ultimate field name. (For single inheritance, these could
all be the same name. Who knows for multiple inheritance). */
static tree
get_vfield_name (type)
tree type;
{
tree binfo = TYPE_BINFO (type);
char *buf;
while (BINFO_BASETYPES (binfo)
&& TYPE_VIRTUAL_P (BINFO_TYPE (BINFO_BASETYPE (binfo, 0)))
&& ! TREE_VIA_VIRTUAL (BINFO_BASETYPE (binfo, 0)))
binfo = BINFO_BASETYPE (binfo, 0);
type = BINFO_TYPE (binfo);
buf = (char *)alloca (sizeof (VFIELD_NAME_FORMAT)
+ TYPE_NAME_LENGTH (type) + 2);
sprintf (buf, VFIELD_NAME_FORMAT, TYPE_NAME_STRING (type));
return get_identifier (buf);
}
void
print_class_statistics ()
{
#ifdef GATHER_STATISTICS
fprintf (stderr, "convert_harshness = %d\n", n_convert_harshness);
fprintf (stderr, "compute_conversion_costs = %d\n", n_compute_conversion_costs);
fprintf (stderr, "build_method_call = %d (inner = %d)\n",
n_build_method_call, n_inner_fields_searched);
if (n_vtables)
{
fprintf (stderr, "vtables = %d; vtable searches = %d\n",
n_vtables, n_vtable_searches);
fprintf (stderr, "vtable entries = %d; vtable elems = %d\n",
n_vtable_entries, n_vtable_elems);
}
#endif
}
/* Push an obstack which is sufficiently long-lived to hold such class
decls that may be cached in the previous_class_values list. For now, let's
use the permanent obstack, later we may create a dedicated obstack just
for this purpose. The effect is undone by pop_obstacks. */
void
maybe_push_cache_obstack ()
{
push_obstacks_nochange ();
if (current_class_depth == 1)
current_obstack = &permanent_obstack;
}
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