1075 lines
32 KiB
C
1075 lines
32 KiB
C
/* Handle the hair of processing (but not expanding) inline functions.
|
||
Also manage function and variable name overloading.
|
||
Copyright (C) 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
|
||
1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
|
||
Contributed by Michael Tiemann (tiemann@cygnus.com)
|
||
|
||
This file is part of GCC.
|
||
|
||
GCC is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 2, or (at your option)
|
||
any later version.
|
||
|
||
GCC is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with GCC; see the file COPYING. If not, write to
|
||
the Free Software Foundation, 59 Temple Place - Suite 330,
|
||
Boston, MA 02111-1307, USA. */
|
||
|
||
|
||
/* Handle method declarations. */
|
||
#include "config.h"
|
||
#include "system.h"
|
||
#include "coretypes.h"
|
||
#include "tm.h"
|
||
#include "tree.h"
|
||
#include "cp-tree.h"
|
||
#include "rtl.h"
|
||
#include "expr.h"
|
||
#include "output.h"
|
||
#include "flags.h"
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||
#include "toplev.h"
|
||
#include "tm_p.h"
|
||
#include "target.h"
|
||
|
||
/* Various flags to control the mangling process. */
|
||
|
||
enum mangling_flags
|
||
{
|
||
/* No flags. */
|
||
mf_none = 0,
|
||
/* The thing we are presently mangling is part of a template type,
|
||
rather than a fully instantiated type. Therefore, we may see
|
||
complex expressions where we would normally expect to see a
|
||
simple integer constant. */
|
||
mf_maybe_uninstantiated = 1,
|
||
/* When mangling a numeric value, use the form `_XX_' (instead of
|
||
just `XX') if the value has more than one digit. */
|
||
mf_use_underscores_around_value = 2
|
||
};
|
||
|
||
typedef enum mangling_flags mangling_flags;
|
||
|
||
static tree thunk_adjust (tree, bool, HOST_WIDE_INT, tree);
|
||
static void do_build_assign_ref (tree);
|
||
static void do_build_copy_constructor (tree);
|
||
static tree synthesize_exception_spec (tree, tree (*) (tree, void *), void *);
|
||
static tree locate_dtor (tree, void *);
|
||
static tree locate_ctor (tree, void *);
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||
static tree locate_copy (tree, void *);
|
||
#ifdef ASM_OUTPUT_DEF
|
||
static tree make_alias_for_thunk (tree);
|
||
#endif
|
||
|
||
/* Called once to initialize method.c. */
|
||
|
||
void
|
||
init_method (void)
|
||
{
|
||
init_mangle ();
|
||
}
|
||
|
||
|
||
/* Set the mangled name (DECL_ASSEMBLER_NAME) for DECL. */
|
||
|
||
void
|
||
set_mangled_name_for_decl (tree decl)
|
||
{
|
||
if (processing_template_decl)
|
||
/* There's no need to mangle the name of a template function. */
|
||
return;
|
||
|
||
mangle_decl (decl);
|
||
}
|
||
|
||
|
||
/* Return a this or result adjusting thunk to FUNCTION. THIS_ADJUSTING
|
||
indicates whether it is a this or result adjusting thunk.
|
||
FIXED_OFFSET and VIRTUAL_OFFSET indicate how to do the adjustment
|
||
(see thunk_adjust). VIRTUAL_OFFSET can be NULL, but FIXED_OFFSET
|
||
never is. VIRTUAL_OFFSET is the /index/ into the vtable for this
|
||
adjusting thunks, we scale it to a byte offset. For covariant
|
||
thunks VIRTUAL_OFFSET is the virtual binfo. You must post process
|
||
the returned thunk with finish_thunk. */
|
||
|
||
tree
|
||
make_thunk (tree function, bool this_adjusting,
|
||
tree fixed_offset, tree virtual_offset)
|
||
{
|
||
HOST_WIDE_INT d;
|
||
tree thunk;
|
||
|
||
my_friendly_assert (TREE_CODE (function) == FUNCTION_DECL, 20021025);
|
||
/* We can have this thunks to covariant thunks, but not vice versa. */
|
||
my_friendly_assert (!DECL_THIS_THUNK_P (function), 20021127);
|
||
my_friendly_assert (!DECL_RESULT_THUNK_P (function) || this_adjusting,
|
||
20031123);
|
||
|
||
/* Scale the VIRTUAL_OFFSET to be in terms of bytes. */
|
||
if (this_adjusting && virtual_offset)
|
||
virtual_offset
|
||
= size_binop (MULT_EXPR,
|
||
virtual_offset,
|
||
convert (ssizetype,
|
||
TYPE_SIZE_UNIT (vtable_entry_type)));
|
||
|
||
d = tree_low_cst (fixed_offset, 0);
|
||
|
||
/* See if we already have the thunk in question. For this_adjusting
|
||
thunks VIRTUAL_OFFSET will be an INTEGER_CST, for covariant thunks it
|
||
will be a BINFO. */
|
||
for (thunk = DECL_THUNKS (function); thunk; thunk = TREE_CHAIN (thunk))
|
||
if (DECL_THIS_THUNK_P (thunk) == this_adjusting
|
||
&& THUNK_FIXED_OFFSET (thunk) == d
|
||
&& !virtual_offset == !THUNK_VIRTUAL_OFFSET (thunk)
|
||
&& (!virtual_offset
|
||
|| (this_adjusting
|
||
? tree_int_cst_equal (THUNK_VIRTUAL_OFFSET (thunk),
|
||
virtual_offset)
|
||
: THUNK_VIRTUAL_OFFSET (thunk) == virtual_offset)))
|
||
return thunk;
|
||
|
||
/* All thunks must be created before FUNCTION is actually emitted;
|
||
the ABI requires that all thunks be emitted together with the
|
||
function to which they transfer control. */
|
||
my_friendly_assert (!TREE_ASM_WRITTEN (function), 20021025);
|
||
/* Likewise, we can only be adding thunks to a function declared in
|
||
the class currently being laid out. */
|
||
my_friendly_assert (TYPE_SIZE (DECL_CONTEXT (function))
|
||
&& TYPE_BEING_DEFINED (DECL_CONTEXT (function)),
|
||
20031211);
|
||
|
||
thunk = build_decl (FUNCTION_DECL, NULL_TREE, TREE_TYPE (function));
|
||
DECL_LANG_SPECIFIC (thunk) = DECL_LANG_SPECIFIC (function);
|
||
cxx_dup_lang_specific_decl (thunk);
|
||
DECL_THUNKS (thunk) = NULL_TREE;
|
||
|
||
DECL_CONTEXT (thunk) = DECL_CONTEXT (function);
|
||
TREE_READONLY (thunk) = TREE_READONLY (function);
|
||
TREE_THIS_VOLATILE (thunk) = TREE_THIS_VOLATILE (function);
|
||
TREE_PUBLIC (thunk) = TREE_PUBLIC (function);
|
||
if (flag_weak)
|
||
comdat_linkage (thunk);
|
||
SET_DECL_THUNK_P (thunk, this_adjusting);
|
||
THUNK_TARGET (thunk) = function;
|
||
THUNK_FIXED_OFFSET (thunk) = d;
|
||
THUNK_VIRTUAL_OFFSET (thunk) = virtual_offset;
|
||
THUNK_ALIAS (thunk) = NULL_TREE;
|
||
|
||
/* The thunk itself is not a constructor or destructor, even if
|
||
the thing it is thunking to is. */
|
||
DECL_INTERFACE_KNOWN (thunk) = 1;
|
||
DECL_NOT_REALLY_EXTERN (thunk) = 1;
|
||
DECL_SAVED_FUNCTION_DATA (thunk) = NULL;
|
||
DECL_DESTRUCTOR_P (thunk) = 0;
|
||
DECL_CONSTRUCTOR_P (thunk) = 0;
|
||
/* And neither is it a clone. */
|
||
DECL_CLONED_FUNCTION (thunk) = NULL_TREE;
|
||
DECL_EXTERNAL (thunk) = 1;
|
||
DECL_ARTIFICIAL (thunk) = 1;
|
||
/* Even if this thunk is a member of a local class, we don't
|
||
need a static chain. */
|
||
DECL_NO_STATIC_CHAIN (thunk) = 1;
|
||
/* The THUNK is not a pending inline, even if the FUNCTION is. */
|
||
DECL_PENDING_INLINE_P (thunk) = 0;
|
||
DECL_INLINE (thunk) = 0;
|
||
DECL_DECLARED_INLINE_P (thunk) = 0;
|
||
/* Nor has it been deferred. */
|
||
DECL_DEFERRED_FN (thunk) = 0;
|
||
|
||
/* Add it to the list of thunks associated with FUNCTION. */
|
||
TREE_CHAIN (thunk) = DECL_THUNKS (function);
|
||
DECL_THUNKS (function) = thunk;
|
||
|
||
return thunk;
|
||
}
|
||
|
||
/* Finish THUNK, a thunk decl. */
|
||
|
||
void
|
||
finish_thunk (tree thunk)
|
||
{
|
||
tree function, name;
|
||
tree fixed_offset = ssize_int (THUNK_FIXED_OFFSET (thunk));
|
||
tree virtual_offset = THUNK_VIRTUAL_OFFSET (thunk);
|
||
|
||
my_friendly_assert (!DECL_NAME (thunk) && DECL_THUNK_P (thunk), 20021127);
|
||
if (virtual_offset && DECL_RESULT_THUNK_P (thunk))
|
||
virtual_offset = BINFO_VPTR_FIELD (virtual_offset);
|
||
function = THUNK_TARGET (thunk);
|
||
name = mangle_thunk (function, DECL_THIS_THUNK_P (thunk),
|
||
fixed_offset, virtual_offset);
|
||
|
||
/* We can end up with declarations of (logically) different
|
||
covariant thunks, that do identical adjustments. The two thunks
|
||
will be adjusting between within different hierarchies, which
|
||
happen to have the same layout. We must nullify one of them to
|
||
refer to the other. */
|
||
if (DECL_RESULT_THUNK_P (thunk))
|
||
{
|
||
tree cov_probe;
|
||
|
||
for (cov_probe = DECL_THUNKS (function);
|
||
cov_probe; cov_probe = TREE_CHAIN (cov_probe))
|
||
if (DECL_NAME (cov_probe) == name)
|
||
{
|
||
my_friendly_assert (!DECL_THUNKS (thunk), 20031023);
|
||
THUNK_ALIAS (thunk) = (THUNK_ALIAS (cov_probe)
|
||
? THUNK_ALIAS (cov_probe) : cov_probe);
|
||
break;
|
||
}
|
||
}
|
||
|
||
DECL_NAME (thunk) = name;
|
||
SET_DECL_ASSEMBLER_NAME (thunk, name);
|
||
}
|
||
|
||
/* Adjust PTR by the constant FIXED_OFFSET, and by the vtable
|
||
offset indicated by VIRTUAL_OFFSET, if that is
|
||
non-null. THIS_ADJUSTING is nonzero for a this adjusting thunk and
|
||
zero for a result adjusting thunk. */
|
||
|
||
static tree
|
||
thunk_adjust (tree ptr, bool this_adjusting,
|
||
HOST_WIDE_INT fixed_offset, tree virtual_offset)
|
||
{
|
||
if (this_adjusting)
|
||
/* Adjust the pointer by the constant. */
|
||
ptr = fold (build (PLUS_EXPR, TREE_TYPE (ptr), ptr,
|
||
ssize_int (fixed_offset)));
|
||
|
||
/* If there's a virtual offset, look up that value in the vtable and
|
||
adjust the pointer again. */
|
||
if (virtual_offset)
|
||
{
|
||
tree vtable;
|
||
|
||
ptr = save_expr (ptr);
|
||
/* The vptr is always at offset zero in the object. */
|
||
vtable = build1 (NOP_EXPR,
|
||
build_pointer_type (build_pointer_type
|
||
(vtable_entry_type)),
|
||
ptr);
|
||
/* Form the vtable address. */
|
||
vtable = build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (vtable)), vtable);
|
||
/* Find the entry with the vcall offset. */
|
||
vtable = build (PLUS_EXPR, TREE_TYPE (vtable), vtable, virtual_offset);
|
||
/* Get the offset itself. */
|
||
vtable = build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (vtable)), vtable);
|
||
/* Adjust the `this' pointer. */
|
||
ptr = fold (build (PLUS_EXPR, TREE_TYPE (ptr), ptr, vtable));
|
||
}
|
||
|
||
if (!this_adjusting)
|
||
/* Adjust the pointer by the constant. */
|
||
ptr = fold (build (PLUS_EXPR, TREE_TYPE (ptr), ptr,
|
||
ssize_int (fixed_offset)));
|
||
|
||
return ptr;
|
||
}
|
||
|
||
/* Garbage collector tables contains thunk_labelno even when places
|
||
inside ifdef block. */
|
||
static GTY (()) int thunk_labelno;
|
||
#ifdef ASM_OUTPUT_DEF
|
||
|
||
/* Create a static alias to function. */
|
||
|
||
static tree
|
||
make_alias_for_thunk (tree function)
|
||
{
|
||
tree alias;
|
||
char buf[256];
|
||
|
||
#if defined (TARGET_IS_PE_COFF)
|
||
if (DECL_ONE_ONLY (function))
|
||
return function;
|
||
#endif
|
||
|
||
ASM_GENERATE_INTERNAL_LABEL (buf, "LTHUNK", thunk_labelno);
|
||
thunk_labelno++;
|
||
alias = build_decl (FUNCTION_DECL, get_identifier (buf),
|
||
TREE_TYPE (function));
|
||
DECL_LANG_SPECIFIC (alias) = DECL_LANG_SPECIFIC (function);
|
||
cxx_dup_lang_specific_decl (alias);
|
||
DECL_CONTEXT (alias) = NULL;
|
||
TREE_READONLY (alias) = TREE_READONLY (function);
|
||
TREE_THIS_VOLATILE (alias) = TREE_THIS_VOLATILE (function);
|
||
TREE_PUBLIC (alias) = 0;
|
||
DECL_INTERFACE_KNOWN (alias) = 1;
|
||
DECL_NOT_REALLY_EXTERN (alias) = 1;
|
||
DECL_THIS_STATIC (alias) = 1;
|
||
DECL_SAVED_FUNCTION_DATA (alias) = NULL;
|
||
DECL_DESTRUCTOR_P (alias) = 0;
|
||
DECL_CONSTRUCTOR_P (alias) = 0;
|
||
DECL_CLONED_FUNCTION (alias) = NULL_TREE;
|
||
DECL_EXTERNAL (alias) = 0;
|
||
DECL_ARTIFICIAL (alias) = 1;
|
||
DECL_NO_STATIC_CHAIN (alias) = 1;
|
||
DECL_PENDING_INLINE_P (alias) = 0;
|
||
DECL_INLINE (alias) = 0;
|
||
DECL_DECLARED_INLINE_P (alias) = 0;
|
||
DECL_DEFERRED_FN (alias) = 0;
|
||
DECL_USE_TEMPLATE (alias) = 0;
|
||
DECL_TEMPLATE_INSTANTIATED (alias) = 0;
|
||
DECL_TEMPLATE_INFO (alias) = NULL;
|
||
DECL_INITIAL (alias) = error_mark_node;
|
||
TREE_ADDRESSABLE (alias) = 1;
|
||
TREE_USED (alias) = 1;
|
||
SET_DECL_ASSEMBLER_NAME (alias, DECL_NAME (alias));
|
||
TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias)) = 1;
|
||
if (!flag_syntax_only)
|
||
assemble_alias (alias, DECL_ASSEMBLER_NAME (function));
|
||
return alias;
|
||
}
|
||
#endif
|
||
|
||
/* Emit the definition of a C++ multiple inheritance or covariant
|
||
return vtable thunk. If EMIT_P is nonzero, the thunk is emitted
|
||
immediately. */
|
||
|
||
void
|
||
use_thunk (tree thunk_fndecl, bool emit_p)
|
||
{
|
||
tree function, alias;
|
||
tree virtual_offset;
|
||
HOST_WIDE_INT fixed_offset, virtual_value;
|
||
bool this_adjusting = DECL_THIS_THUNK_P (thunk_fndecl);
|
||
|
||
/* We should have called finish_thunk to give it a name. */
|
||
my_friendly_assert (DECL_NAME (thunk_fndecl), 20021127);
|
||
|
||
/* We should never be using an alias, always refer to the
|
||
aliased thunk. */
|
||
my_friendly_assert (!THUNK_ALIAS (thunk_fndecl), 20031023);
|
||
|
||
if (TREE_ASM_WRITTEN (thunk_fndecl))
|
||
return;
|
||
|
||
function = THUNK_TARGET (thunk_fndecl);
|
||
if (DECL_RESULT (thunk_fndecl))
|
||
/* We already turned this thunk into an ordinary function.
|
||
There's no need to process this thunk again. */
|
||
return;
|
||
|
||
if (DECL_THUNK_P (function))
|
||
/* The target is itself a thunk, process it now. */
|
||
use_thunk (function, emit_p);
|
||
|
||
/* Thunks are always addressable; they only appear in vtables. */
|
||
TREE_ADDRESSABLE (thunk_fndecl) = 1;
|
||
|
||
/* Figure out what function is being thunked to. It's referenced in
|
||
this translation unit. */
|
||
TREE_ADDRESSABLE (function) = 1;
|
||
mark_used (function);
|
||
if (!emit_p)
|
||
return;
|
||
|
||
#ifdef ASM_OUTPUT_DEF
|
||
alias = make_alias_for_thunk (function);
|
||
#else
|
||
alias = function;
|
||
#endif
|
||
|
||
fixed_offset = THUNK_FIXED_OFFSET (thunk_fndecl);
|
||
virtual_offset = THUNK_VIRTUAL_OFFSET (thunk_fndecl);
|
||
|
||
if (virtual_offset)
|
||
{
|
||
if (!this_adjusting)
|
||
virtual_offset = BINFO_VPTR_FIELD (virtual_offset);
|
||
virtual_value = tree_low_cst (virtual_offset, /*pos=*/0);
|
||
my_friendly_assert (virtual_value, 20021026);
|
||
}
|
||
else
|
||
virtual_value = 0;
|
||
|
||
/* And, if we need to emit the thunk, it's used. */
|
||
mark_used (thunk_fndecl);
|
||
/* This thunk is actually defined. */
|
||
DECL_EXTERNAL (thunk_fndecl) = 0;
|
||
/* The linkage of the function may have changed. FIXME in linkage
|
||
rewrite. */
|
||
TREE_PUBLIC (thunk_fndecl) = TREE_PUBLIC (function);
|
||
DECL_VISIBILITY (thunk_fndecl) = DECL_VISIBILITY (function);
|
||
|
||
if (flag_syntax_only)
|
||
{
|
||
TREE_ASM_WRITTEN (thunk_fndecl) = 1;
|
||
return;
|
||
}
|
||
|
||
push_to_top_level ();
|
||
|
||
#if defined (ASM_OUTPUT_DEF) \
|
||
&& !defined (TARGET_IS_PE_COFF)
|
||
if (targetm.have_named_sections)
|
||
{
|
||
resolve_unique_section (function, 0, flag_function_sections);
|
||
|
||
if (DECL_SECTION_NAME (function) != NULL && DECL_ONE_ONLY (function))
|
||
{
|
||
resolve_unique_section (thunk_fndecl, 0, flag_function_sections);
|
||
|
||
/* Output the thunk into the same section as function. */
|
||
DECL_SECTION_NAME (thunk_fndecl) = DECL_SECTION_NAME (function);
|
||
}
|
||
}
|
||
#endif
|
||
|
||
/* The back-end expects DECL_INITIAL to contain a BLOCK, so we
|
||
create one. */
|
||
DECL_INITIAL (thunk_fndecl) = make_node (BLOCK);
|
||
BLOCK_VARS (DECL_INITIAL (thunk_fndecl)) = DECL_ARGUMENTS (thunk_fndecl);
|
||
|
||
if (this_adjusting
|
||
&& targetm.asm_out.can_output_mi_thunk (thunk_fndecl, fixed_offset,
|
||
virtual_value, alias))
|
||
{
|
||
const char *fnname;
|
||
current_function_decl = thunk_fndecl;
|
||
DECL_RESULT (thunk_fndecl)
|
||
= build_decl (RESULT_DECL, 0, integer_type_node);
|
||
fnname = XSTR (XEXP (DECL_RTL (thunk_fndecl), 0), 0);
|
||
init_function_start (thunk_fndecl);
|
||
current_function_is_thunk = 1;
|
||
assemble_start_function (thunk_fndecl, fnname);
|
||
|
||
targetm.asm_out.output_mi_thunk (asm_out_file, thunk_fndecl,
|
||
fixed_offset, virtual_value, alias);
|
||
|
||
assemble_end_function (thunk_fndecl, fnname);
|
||
current_function_decl = 0;
|
||
cfun = 0;
|
||
/* Because init_function_start increments this, we must
|
||
decrement it. */
|
||
immediate_size_expand--;
|
||
TREE_ASM_WRITTEN (thunk_fndecl) = 1;
|
||
}
|
||
else
|
||
{
|
||
/* If this is a covariant thunk, or we don't have the necessary
|
||
code for efficient thunks, generate a thunk function that
|
||
just makes a call to the real function. Unfortunately, this
|
||
doesn't work for varargs. */
|
||
|
||
tree a, t;
|
||
|
||
if (varargs_function_p (function))
|
||
error ("generic thunk code fails for method `%#D' which uses `...'",
|
||
function);
|
||
|
||
/* Set up cloned argument trees for the thunk. */
|
||
t = NULL_TREE;
|
||
for (a = DECL_ARGUMENTS (function); a; a = TREE_CHAIN (a))
|
||
{
|
||
tree x = copy_node (a);
|
||
TREE_CHAIN (x) = t;
|
||
DECL_CONTEXT (x) = thunk_fndecl;
|
||
SET_DECL_RTL (x, NULL_RTX);
|
||
t = x;
|
||
}
|
||
a = nreverse (t);
|
||
DECL_ARGUMENTS (thunk_fndecl) = a;
|
||
DECL_RESULT (thunk_fndecl) = NULL_TREE;
|
||
|
||
start_function (NULL_TREE, thunk_fndecl, NULL_TREE, SF_PRE_PARSED);
|
||
/* We don't bother with a body block for thunks. */
|
||
|
||
/* There's no need to check accessibility inside the thunk body. */
|
||
push_deferring_access_checks (dk_no_check);
|
||
|
||
t = a;
|
||
if (this_adjusting)
|
||
t = thunk_adjust (t, /*this_adjusting=*/1,
|
||
fixed_offset, virtual_offset);
|
||
|
||
/* Build up the call to the real function. */
|
||
t = tree_cons (NULL_TREE, t, NULL_TREE);
|
||
for (a = TREE_CHAIN (a); a; a = TREE_CHAIN (a))
|
||
t = tree_cons (NULL_TREE, a, t);
|
||
t = nreverse (t);
|
||
t = build_call (alias, t);
|
||
CALL_FROM_THUNK_P (t) = 1;
|
||
t = force_target_expr (TREE_TYPE (t), t);
|
||
if (!this_adjusting)
|
||
t = thunk_adjust (t, /*this_adjusting=*/0,
|
||
fixed_offset, virtual_offset);
|
||
|
||
if (VOID_TYPE_P (TREE_TYPE (t)))
|
||
finish_expr_stmt (t);
|
||
else
|
||
finish_return_stmt (t);
|
||
|
||
/* Since we want to emit the thunk, we explicitly mark its name as
|
||
referenced. */
|
||
mark_referenced (DECL_ASSEMBLER_NAME (thunk_fndecl));
|
||
|
||
/* But we don't want debugging information about it. */
|
||
DECL_IGNORED_P (thunk_fndecl) = 1;
|
||
|
||
/* Re-enable access control. */
|
||
pop_deferring_access_checks ();
|
||
|
||
expand_body (finish_function (0));
|
||
}
|
||
|
||
pop_from_top_level ();
|
||
}
|
||
|
||
/* Code for synthesizing methods which have default semantics defined. */
|
||
|
||
/* Generate code for default X(X&) constructor. */
|
||
|
||
static void
|
||
do_build_copy_constructor (tree fndecl)
|
||
{
|
||
tree parm = FUNCTION_FIRST_USER_PARM (fndecl);
|
||
tree t;
|
||
|
||
parm = convert_from_reference (parm);
|
||
|
||
if (TYPE_HAS_TRIVIAL_INIT_REF (current_class_type)
|
||
&& is_empty_class (current_class_type))
|
||
/* Don't copy the padding byte; it might not have been allocated
|
||
if *this is a base subobject. */;
|
||
else if (TYPE_HAS_TRIVIAL_INIT_REF (current_class_type))
|
||
{
|
||
t = build (INIT_EXPR, void_type_node, current_class_ref, parm);
|
||
finish_expr_stmt (t);
|
||
}
|
||
else
|
||
{
|
||
tree fields = TYPE_FIELDS (current_class_type);
|
||
int n_bases = CLASSTYPE_N_BASECLASSES (current_class_type);
|
||
tree binfos = TYPE_BINFO_BASETYPES (current_class_type);
|
||
tree member_init_list = NULL_TREE;
|
||
int cvquals = cp_type_quals (TREE_TYPE (parm));
|
||
int i;
|
||
|
||
/* Initialize all the base-classes with the parameter converted
|
||
to their type so that we get their copy constructor and not
|
||
another constructor that takes current_class_type. We must
|
||
deal with the binfo's directly as a direct base might be
|
||
inaccessible due to ambiguity. */
|
||
for (t = CLASSTYPE_VBASECLASSES (current_class_type); t;
|
||
t = TREE_CHAIN (t))
|
||
{
|
||
tree binfo = TREE_VALUE (t);
|
||
|
||
member_init_list
|
||
= tree_cons (binfo,
|
||
build_tree_list (NULL_TREE,
|
||
build_base_path (PLUS_EXPR, parm,
|
||
binfo, 1)),
|
||
member_init_list);
|
||
}
|
||
|
||
for (i = 0; i < n_bases; ++i)
|
||
{
|
||
tree binfo = TREE_VEC_ELT (binfos, i);
|
||
if (TREE_VIA_VIRTUAL (binfo))
|
||
continue;
|
||
|
||
member_init_list
|
||
= tree_cons (binfo,
|
||
build_tree_list (NULL_TREE,
|
||
build_base_path (PLUS_EXPR, parm,
|
||
binfo, 1)),
|
||
member_init_list);
|
||
}
|
||
|
||
for (; fields; fields = TREE_CHAIN (fields))
|
||
{
|
||
tree init = parm;
|
||
tree field = fields;
|
||
tree expr_type;
|
||
|
||
if (TREE_CODE (field) != FIELD_DECL)
|
||
continue;
|
||
|
||
expr_type = TREE_TYPE (field);
|
||
if (DECL_NAME (field))
|
||
{
|
||
if (VFIELD_NAME_P (DECL_NAME (field)))
|
||
continue;
|
||
|
||
/* True for duplicate members. */
|
||
if (IDENTIFIER_CLASS_VALUE (DECL_NAME (field)) != field)
|
||
continue;
|
||
}
|
||
else if (ANON_AGGR_TYPE_P (expr_type) && TYPE_FIELDS (expr_type))
|
||
/* Just use the field; anonymous types can't have
|
||
nontrivial copy ctors or assignment ops. */;
|
||
else
|
||
continue;
|
||
|
||
/* Compute the type of "init->field". If the copy-constructor
|
||
parameter is, for example, "const S&", and the type of
|
||
the field is "T", then the type will usually be "const
|
||
T". (There are no cv-qualified variants of reference
|
||
types.) */
|
||
if (TREE_CODE (expr_type) != REFERENCE_TYPE)
|
||
{
|
||
int quals = cvquals;
|
||
|
||
if (DECL_MUTABLE_P (field))
|
||
quals &= ~TYPE_QUAL_CONST;
|
||
expr_type = cp_build_qualified_type (expr_type, quals);
|
||
}
|
||
|
||
init = build (COMPONENT_REF, expr_type, init, field);
|
||
init = build_tree_list (NULL_TREE, init);
|
||
|
||
member_init_list = tree_cons (field, init, member_init_list);
|
||
}
|
||
finish_mem_initializers (member_init_list);
|
||
}
|
||
}
|
||
|
||
static void
|
||
do_build_assign_ref (tree fndecl)
|
||
{
|
||
tree parm = TREE_CHAIN (DECL_ARGUMENTS (fndecl));
|
||
tree compound_stmt;
|
||
|
||
compound_stmt = begin_compound_stmt (/*has_no_scope=*/false);
|
||
parm = convert_from_reference (parm);
|
||
|
||
if (TYPE_HAS_TRIVIAL_ASSIGN_REF (current_class_type)
|
||
&& is_empty_class (current_class_type))
|
||
/* Don't copy the padding byte; it might not have been allocated
|
||
if *this is a base subobject. */;
|
||
else if (TYPE_HAS_TRIVIAL_ASSIGN_REF (current_class_type))
|
||
{
|
||
tree t = build (MODIFY_EXPR, void_type_node, current_class_ref, parm);
|
||
finish_expr_stmt (t);
|
||
}
|
||
else
|
||
{
|
||
tree fields;
|
||
int cvquals = cp_type_quals (TREE_TYPE (parm));
|
||
int i;
|
||
|
||
/* Assign to each of the direct base classes. */
|
||
for (i = 0; i < CLASSTYPE_N_BASECLASSES (current_class_type); ++i)
|
||
{
|
||
tree binfo;
|
||
tree converted_parm;
|
||
|
||
binfo = BINFO_BASETYPE (TYPE_BINFO (current_class_type), i);
|
||
/* We must convert PARM directly to the base class
|
||
explicitly since the base class may be ambiguous. */
|
||
converted_parm = build_base_path (PLUS_EXPR, parm, binfo, 1);
|
||
/* Call the base class assignment operator. */
|
||
finish_expr_stmt
|
||
(build_special_member_call (current_class_ref,
|
||
ansi_assopname (NOP_EXPR),
|
||
build_tree_list (NULL_TREE,
|
||
converted_parm),
|
||
binfo,
|
||
LOOKUP_NORMAL | LOOKUP_NONVIRTUAL));
|
||
}
|
||
|
||
/* Assign to each of the non-static data members. */
|
||
for (fields = TYPE_FIELDS (current_class_type);
|
||
fields;
|
||
fields = TREE_CHAIN (fields))
|
||
{
|
||
tree comp = current_class_ref;
|
||
tree init = parm;
|
||
tree field = fields;
|
||
tree expr_type;
|
||
int quals;
|
||
|
||
if (TREE_CODE (field) != FIELD_DECL || DECL_ARTIFICIAL (field))
|
||
continue;
|
||
|
||
expr_type = TREE_TYPE (field);
|
||
if (CP_TYPE_CONST_P (expr_type))
|
||
{
|
||
error ("non-static const member `%#D', can't use default assignment operator", field);
|
||
continue;
|
||
}
|
||
else if (TREE_CODE (expr_type) == REFERENCE_TYPE)
|
||
{
|
||
error ("non-static reference member `%#D', can't use default assignment operator", field);
|
||
continue;
|
||
}
|
||
|
||
if (DECL_NAME (field))
|
||
{
|
||
if (VFIELD_NAME_P (DECL_NAME (field)))
|
||
continue;
|
||
|
||
/* True for duplicate members. */
|
||
if (IDENTIFIER_CLASS_VALUE (DECL_NAME (field)) != field)
|
||
continue;
|
||
}
|
||
else if (ANON_AGGR_TYPE_P (expr_type) && TYPE_FIELDS (expr_type))
|
||
/* Just use the field; anonymous types can't have
|
||
nontrivial copy ctors or assignment ops. */;
|
||
else
|
||
continue;
|
||
|
||
comp = build (COMPONENT_REF, TREE_TYPE (field), comp, field);
|
||
|
||
/* Compute the type of init->field */
|
||
quals = cvquals;
|
||
if (DECL_MUTABLE_P (field))
|
||
quals &= ~TYPE_QUAL_CONST;
|
||
expr_type = cp_build_qualified_type (expr_type, quals);
|
||
|
||
init = build (COMPONENT_REF, expr_type, init, field);
|
||
|
||
if (DECL_NAME (field))
|
||
init = build_modify_expr (comp, NOP_EXPR, init);
|
||
else
|
||
init = build (MODIFY_EXPR, TREE_TYPE (comp), comp, init);
|
||
finish_expr_stmt (init);
|
||
}
|
||
}
|
||
finish_return_stmt (current_class_ref);
|
||
finish_compound_stmt (compound_stmt);
|
||
}
|
||
|
||
void
|
||
synthesize_method (tree fndecl)
|
||
{
|
||
bool nested = (current_function_decl != NULL_TREE);
|
||
tree context = decl_function_context (fndecl);
|
||
bool need_body = true;
|
||
tree stmt;
|
||
|
||
if (at_eof)
|
||
import_export_decl (fndecl);
|
||
|
||
/* If we've been asked to synthesize a clone, just synthesize the
|
||
cloned function instead. Doing so will automatically fill in the
|
||
body for the clone. */
|
||
if (DECL_CLONED_FUNCTION_P (fndecl))
|
||
{
|
||
synthesize_method (DECL_CLONED_FUNCTION (fndecl));
|
||
return;
|
||
}
|
||
|
||
/* We may be in the middle of deferred access check. Disable
|
||
it now. */
|
||
push_deferring_access_checks (dk_no_deferred);
|
||
|
||
if (! context)
|
||
push_to_top_level ();
|
||
else if (nested)
|
||
push_function_context_to (context);
|
||
|
||
/* Put the function definition at the position where it is needed,
|
||
rather than within the body of the class. That way, an error
|
||
during the generation of the implicit body points at the place
|
||
where the attempt to generate the function occurs, giving the
|
||
user a hint as to why we are attempting to generate the
|
||
function. */
|
||
DECL_SOURCE_LOCATION (fndecl) = input_location;
|
||
|
||
interface_unknown = 1;
|
||
start_function (NULL_TREE, fndecl, NULL_TREE, SF_DEFAULT | SF_PRE_PARSED);
|
||
clear_last_expr ();
|
||
stmt = begin_function_body ();
|
||
|
||
if (DECL_OVERLOADED_OPERATOR_P (fndecl) == NOP_EXPR)
|
||
{
|
||
do_build_assign_ref (fndecl);
|
||
need_body = false;
|
||
}
|
||
else if (DECL_CONSTRUCTOR_P (fndecl))
|
||
{
|
||
tree arg_chain = FUNCTION_FIRST_USER_PARMTYPE (fndecl);
|
||
if (arg_chain != void_list_node)
|
||
do_build_copy_constructor (fndecl);
|
||
else if (TYPE_NEEDS_CONSTRUCTING (current_class_type))
|
||
finish_mem_initializers (NULL_TREE);
|
||
}
|
||
|
||
/* If we haven't yet generated the body of the function, just
|
||
generate an empty compound statement. */
|
||
if (need_body)
|
||
{
|
||
tree compound_stmt;
|
||
compound_stmt = begin_compound_stmt (/*has_no_scope=*/false);
|
||
finish_compound_stmt (compound_stmt);
|
||
}
|
||
|
||
finish_function_body (stmt);
|
||
expand_or_defer_fn (finish_function (0));
|
||
|
||
extract_interface_info ();
|
||
if (! context)
|
||
pop_from_top_level ();
|
||
else if (nested)
|
||
pop_function_context_from (context);
|
||
|
||
pop_deferring_access_checks ();
|
||
}
|
||
|
||
/* Use EXTRACTOR to locate the relevant function called for each base &
|
||
class field of TYPE. CLIENT allows additional information to be passed
|
||
to EXTRACTOR. Generates the union of all exceptions generated by those
|
||
functions. Note that we haven't updated TYPE_FIELDS and such of any
|
||
variants yet, so we need to look at the main one. */
|
||
|
||
static tree
|
||
synthesize_exception_spec (tree type, tree (*extractor) (tree, void*),
|
||
void *client)
|
||
{
|
||
tree raises = empty_except_spec;
|
||
tree fields = TYPE_FIELDS (type);
|
||
int i, n_bases = CLASSTYPE_N_BASECLASSES (type);
|
||
tree binfos = TYPE_BINFO_BASETYPES (type);
|
||
|
||
for (i = 0; i != n_bases; i++)
|
||
{
|
||
tree base = BINFO_TYPE (TREE_VEC_ELT (binfos, i));
|
||
tree fn = (*extractor) (base, client);
|
||
if (fn)
|
||
{
|
||
tree fn_raises = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn));
|
||
|
||
raises = merge_exception_specifiers (raises, fn_raises);
|
||
}
|
||
}
|
||
for (; fields; fields = TREE_CHAIN (fields))
|
||
{
|
||
tree type = TREE_TYPE (fields);
|
||
tree fn;
|
||
|
||
if (TREE_CODE (fields) != FIELD_DECL || DECL_ARTIFICIAL (fields))
|
||
continue;
|
||
while (TREE_CODE (type) == ARRAY_TYPE)
|
||
type = TREE_TYPE (type);
|
||
if (TREE_CODE (type) != RECORD_TYPE)
|
||
continue;
|
||
|
||
fn = (*extractor) (type, client);
|
||
if (fn)
|
||
{
|
||
tree fn_raises = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn));
|
||
|
||
raises = merge_exception_specifiers (raises, fn_raises);
|
||
}
|
||
}
|
||
return raises;
|
||
}
|
||
|
||
/* Locate the dtor of TYPE. */
|
||
|
||
static tree
|
||
locate_dtor (tree type, void *client ATTRIBUTE_UNUSED)
|
||
{
|
||
tree fns;
|
||
|
||
if (!TYPE_HAS_DESTRUCTOR (type))
|
||
return NULL_TREE;
|
||
fns = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (type),
|
||
CLASSTYPE_DESTRUCTOR_SLOT);
|
||
return fns;
|
||
}
|
||
|
||
/* Locate the default ctor of TYPE. */
|
||
|
||
static tree
|
||
locate_ctor (tree type, void *client ATTRIBUTE_UNUSED)
|
||
{
|
||
tree fns;
|
||
|
||
if (!TYPE_HAS_DEFAULT_CONSTRUCTOR (type))
|
||
return NULL_TREE;
|
||
|
||
fns = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (type),
|
||
CLASSTYPE_CONSTRUCTOR_SLOT);
|
||
for (; fns; fns = OVL_NEXT (fns))
|
||
{
|
||
tree fn = OVL_CURRENT (fns);
|
||
tree parms = TYPE_ARG_TYPES (TREE_TYPE (fn));
|
||
|
||
if (sufficient_parms_p (TREE_CHAIN (parms)))
|
||
return fn;
|
||
}
|
||
return NULL_TREE;
|
||
}
|
||
|
||
struct copy_data
|
||
{
|
||
tree name;
|
||
int quals;
|
||
};
|
||
|
||
/* Locate the copy ctor or copy assignment of TYPE. CLIENT_
|
||
points to a COPY_DATA holding the name (NULL for the ctor)
|
||
and desired qualifiers of the source operand. */
|
||
|
||
static tree
|
||
locate_copy (tree type, void *client_)
|
||
{
|
||
struct copy_data *client = (struct copy_data *)client_;
|
||
tree fns;
|
||
int ix = -1;
|
||
tree best = NULL_TREE;
|
||
bool excess_p = false;
|
||
|
||
if (client->name)
|
||
{
|
||
if (TYPE_HAS_ASSIGN_REF (type))
|
||
ix = lookup_fnfields_1 (type, client->name);
|
||
}
|
||
else if (TYPE_HAS_INIT_REF (type))
|
||
ix = CLASSTYPE_CONSTRUCTOR_SLOT;
|
||
if (ix < 0)
|
||
return NULL_TREE;
|
||
fns = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (type), ix);
|
||
|
||
for (; fns; fns = OVL_NEXT (fns))
|
||
{
|
||
tree fn = OVL_CURRENT (fns);
|
||
tree parms = TYPE_ARG_TYPES (TREE_TYPE (fn));
|
||
tree src_type;
|
||
int excess;
|
||
int quals;
|
||
|
||
parms = TREE_CHAIN (parms);
|
||
if (!parms)
|
||
continue;
|
||
src_type = non_reference (TREE_VALUE (parms));
|
||
if (!same_type_ignoring_top_level_qualifiers_p (src_type, type))
|
||
continue;
|
||
if (!sufficient_parms_p (TREE_CHAIN (parms)))
|
||
continue;
|
||
quals = cp_type_quals (src_type);
|
||
if (client->quals & ~quals)
|
||
continue;
|
||
excess = quals & ~client->quals;
|
||
if (!best || (excess_p && !excess))
|
||
{
|
||
best = fn;
|
||
excess_p = excess;
|
||
}
|
||
else
|
||
/* Ambiguous */
|
||
return NULL_TREE;
|
||
}
|
||
return best;
|
||
}
|
||
|
||
/* Implicitly declare the special function indicated by KIND, as a
|
||
member of TYPE. For copy constructors and assignment operators,
|
||
CONST_P indicates whether these functions should take a const
|
||
reference argument or a non-const reference. */
|
||
|
||
tree
|
||
implicitly_declare_fn (special_function_kind kind, tree type, bool const_p)
|
||
{
|
||
tree declspecs = NULL_TREE;
|
||
tree fn, args = NULL_TREE;
|
||
tree raises = empty_except_spec;
|
||
bool retref = false;
|
||
bool has_parm = false;
|
||
tree name = constructor_name (type);
|
||
|
||
switch (kind)
|
||
{
|
||
case sfk_destructor:
|
||
/* Destructor. */
|
||
name = build_nt (BIT_NOT_EXPR, name);
|
||
args = void_list_node;
|
||
raises = synthesize_exception_spec (type, &locate_dtor, 0);
|
||
break;
|
||
|
||
case sfk_constructor:
|
||
/* Default constructor. */
|
||
args = void_list_node;
|
||
raises = synthesize_exception_spec (type, &locate_ctor, 0);
|
||
break;
|
||
|
||
case sfk_copy_constructor:
|
||
case sfk_assignment_operator:
|
||
{
|
||
struct copy_data data;
|
||
tree argtype = type;
|
||
|
||
has_parm = true;
|
||
data.name = NULL;
|
||
data.quals = 0;
|
||
if (kind == sfk_assignment_operator)
|
||
{
|
||
retref = true;
|
||
declspecs = build_tree_list (NULL_TREE, type);
|
||
|
||
name = ansi_assopname (NOP_EXPR);
|
||
data.name = name;
|
||
}
|
||
if (const_p)
|
||
{
|
||
data.quals = TYPE_QUAL_CONST;
|
||
argtype = build_qualified_type (argtype, TYPE_QUAL_CONST);
|
||
}
|
||
|
||
argtype = build_reference_type (argtype);
|
||
args = build_tree_list (hash_tree_chain (argtype, NULL_TREE),
|
||
get_identifier ("_ctor_arg"));
|
||
args = tree_cons (NULL_TREE, args, void_list_node);
|
||
|
||
raises = synthesize_exception_spec (type, &locate_copy, &data);
|
||
break;
|
||
}
|
||
default:
|
||
abort ();
|
||
}
|
||
|
||
TREE_PARMLIST (args) = 1;
|
||
|
||
{
|
||
tree declarator = make_call_declarator (name, args, NULL_TREE, raises);
|
||
|
||
if (retref)
|
||
declarator = build_nt (ADDR_EXPR, declarator);
|
||
|
||
fn = grokfield (declarator, declspecs, NULL_TREE, NULL_TREE, NULL_TREE);
|
||
if (has_parm)
|
||
TREE_USED (FUNCTION_FIRST_USER_PARM (fn)) = 1;
|
||
}
|
||
|
||
my_friendly_assert (TREE_CODE (fn) == FUNCTION_DECL, 20000408);
|
||
|
||
DECL_ARTIFICIAL (fn) = 1;
|
||
DECL_NOT_REALLY_EXTERN (fn) = 1;
|
||
DECL_DECLARED_INLINE_P (fn) = 1;
|
||
DECL_INLINE (fn) = 1;
|
||
defer_fn (fn);
|
||
|
||
return fn;
|
||
}
|
||
|
||
/* Given a FUNCTION_DECL FN and a chain LIST, skip as many elements of LIST
|
||
as there are artificial parms in FN. */
|
||
|
||
tree
|
||
skip_artificial_parms_for (tree fn, tree list)
|
||
{
|
||
if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn))
|
||
list = TREE_CHAIN (list);
|
||
else
|
||
return list;
|
||
|
||
if (DECL_HAS_IN_CHARGE_PARM_P (fn))
|
||
list = TREE_CHAIN (list);
|
||
if (DECL_HAS_VTT_PARM_P (fn))
|
||
list = TREE_CHAIN (list);
|
||
return list;
|
||
}
|
||
|
||
#include "gt-cp-method.h"
|