/* 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, 2005 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
+ 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)
+the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
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, 51 Franklin Street, Fifth Floor,
-Boston, MA 02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
/* Handle method declarations. */
#include "tm.h"
#include "tree.h"
#include "cp-tree.h"
-#include "rtl.h"
-#include "expr.h"
#include "output.h"
#include "flags.h"
#include "toplev.h"
#include "tm_p.h"
#include "target.h"
+#include "common/common-target.h"
#include "tree-pass.h"
#include "diagnostic.h"
+#include "cgraph.h"
+#include "gimple.h"
/* Various flags to control the mangling process. */
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_assign (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 *);
-static tree locate_copy (tree, void *);
static tree make_alias_for_thunk (tree);
/* Called once to initialize method.c. */
/* 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))
+ for (thunk = DECL_THUNKS (function); thunk; thunk = DECL_CHAIN (thunk))
if (DECL_THIS_THUNK_P (thunk) == this_adjusting
&& THUNK_FIXED_OFFSET (thunk) == d
&& !virtual_offset == !THUNK_VIRTUAL_OFFSET (thunk)
gcc_assert (TYPE_SIZE (DECL_CONTEXT (function))
&& TYPE_BEING_DEFINED (DECL_CONTEXT (function)));
- thunk = build_decl (FUNCTION_DECL, NULL_TREE, TREE_TYPE (function));
+ thunk = build_decl (DECL_SOURCE_LOCATION (function),
+ 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;
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_COMDAT (thunk) = DECL_COMDAT (function);
DECL_SAVED_FUNCTION_DATA (thunk) = NULL;
+ /* The thunk itself is not a constructor or destructor, even if
+ the thing it is thunking to is. */
DECL_DESTRUCTOR_P (thunk) = 0;
DECL_CONSTRUCTOR_P (thunk) = 0;
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;
/* Nor is it a template instantiation. */
DECL_USE_TEMPLATE (thunk) = 0;
DECL_TEMPLATE_INFO (thunk) = NULL;
/* Add it to the list of thunks associated with FUNCTION. */
- TREE_CHAIN (thunk) = DECL_THUNKS (function);
+ DECL_CHAIN (thunk) = DECL_THUNKS (function);
DECL_THUNKS (function) = thunk;
return thunk;
tree cov_probe;
for (cov_probe = DECL_THUNKS (function);
- cov_probe; cov_probe = TREE_CHAIN (cov_probe))
+ cov_probe; cov_probe = DECL_CHAIN (cov_probe))
if (DECL_NAME (cov_probe) == name)
{
gcc_assert (!DECL_THUNKS (thunk));
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_build2 (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 = build2 (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_build2 (PLUS_EXPR, TREE_TYPE (ptr), ptr, vtable);
- }
-
- if (!this_adjusting)
- /* Adjust the pointer by the constant. */
- ptr = fold_build2 (PLUS_EXPR, TREE_TYPE (ptr), ptr,
- ssize_int (fixed_offset));
-
- return ptr;
-}
-
static GTY (()) int thunk_labelno;
-/* Create a static alias to function. */
+/* Create a static alias to target. */
tree
-make_alias_for (tree function, tree newid)
+make_alias_for (tree target, tree newid)
{
- tree alias = build_decl (FUNCTION_DECL, newid, TREE_TYPE (function));
- DECL_LANG_SPECIFIC (alias) = DECL_LANG_SPECIFIC (function);
+ tree alias = build_decl (DECL_SOURCE_LOCATION (target),
+ TREE_CODE (target), newid, TREE_TYPE (target));
+ DECL_LANG_SPECIFIC (alias) = DECL_LANG_SPECIFIC (target);
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_READONLY (alias) = TREE_READONLY (target);
+ TREE_THIS_VOLATILE (alias) = TREE_THIS_VOLATILE (target);
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;
+ if (DECL_LANG_SPECIFIC (alias))
+ {
+ DECL_NOT_REALLY_EXTERN (alias) = 1;
+ DECL_USE_TEMPLATE (alias) = 0;
+ DECL_TEMPLATE_INFO (alias) = NULL;
+ }
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;
+ if (TREE_CODE (alias) == FUNCTION_DECL)
+ {
+ DECL_SAVED_FUNCTION_DATA (alias) = NULL;
+ DECL_DESTRUCTOR_P (alias) = 0;
+ DECL_CONSTRUCTOR_P (alias) = 0;
+ DECL_PENDING_INLINE_P (alias) = 0;
+ DECL_DECLARED_INLINE_P (alias) = 0;
+ DECL_INITIAL (alias) = error_mark_node;
+ DECL_ARGUMENTS (alias) = copy_list (DECL_ARGUMENTS (target));
+ }
+ else
+ TREE_STATIC (alias) = 1;
TREE_ADDRESSABLE (alias) = 1;
TREE_USED (alias) = 1;
SET_DECL_ASSEMBLER_NAME (alias, DECL_NAME (alias));
tree alias;
char buf[256];
- ASM_GENERATE_INTERNAL_LABEL (buf, "LTHUNK", thunk_labelno);
+ targetm.asm_out.generate_internal_label (buf, "LTHUNK", thunk_labelno);
thunk_labelno++;
alias = make_alias_for (function, get_identifier (buf));
if (!flag_syntax_only)
- assemble_alias (alias, DECL_ASSEMBLER_NAME (function));
+ {
+ struct cgraph_node *funcn, *aliasn;
+ funcn = cgraph_get_node (function);
+ gcc_checking_assert (funcn);
+ aliasn = cgraph_same_body_alias (funcn, alias, function);
+ DECL_ASSEMBLER_NAME (function);
+ gcc_assert (aliasn != NULL);
+ }
return alias;
}
tree virtual_offset;
HOST_WIDE_INT fixed_offset, virtual_value;
bool this_adjusting = DECL_THIS_THUNK_P (thunk_fndecl);
+ struct cgraph_node *funcn, *thunk_node;
/* We should have called finish_thunk to give it a name. */
gcc_assert (DECL_NAME (thunk_fndecl));
DECL_EXTERNAL (thunk_fndecl) = 0;
/* The linkage of the function may have changed. FIXME in linkage
rewrite. */
+ gcc_assert (DECL_INTERFACE_KNOWN (function));
TREE_PUBLIC (thunk_fndecl) = TREE_PUBLIC (function);
DECL_VISIBILITY (thunk_fndecl) = DECL_VISIBILITY (function);
DECL_VISIBILITY_SPECIFIED (thunk_fndecl)
= DECL_VISIBILITY_SPECIFIED (function);
- if (DECL_ONE_ONLY (function))
- make_decl_one_only (thunk_fndecl);
+ DECL_COMDAT (thunk_fndecl) = DECL_COMDAT (function);
+ DECL_WEAK (thunk_fndecl) = DECL_WEAK (function);
if (flag_syntax_only)
{
push_to_top_level ();
if (TARGET_USE_LOCAL_THUNK_ALIAS_P (function)
- && targetm.have_named_sections)
+ && targetm_common.have_named_sections)
{
resolve_unique_section (function, 0, flag_function_sections);
}
}
- /* The back-end expects DECL_INITIAL to contain a BLOCK, so we
- create one. */
- DECL_INITIAL (thunk_fndecl) = make_node (BLOCK);
-
/* Set up cloned argument trees for the thunk. */
t = NULL_TREE;
- for (a = DECL_ARGUMENTS (function); a; a = TREE_CHAIN (a))
+ for (a = DECL_ARGUMENTS (function); a; a = DECL_CHAIN (a))
{
tree x = copy_node (a);
- TREE_CHAIN (x) = t;
+ DECL_CHAIN (x) = t;
DECL_CONTEXT (x) = thunk_fndecl;
- SET_DECL_RTL (x, NULL_RTX);
+ SET_DECL_RTL (x, NULL);
DECL_HAS_VALUE_EXPR_P (x) = 0;
+ TREE_ADDRESSABLE (x) = 0;
t = x;
}
a = nreverse (t);
DECL_ARGUMENTS (thunk_fndecl) = a;
- BLOCK_VARS (DECL_INITIAL (thunk_fndecl)) = a;
+ TREE_ASM_WRITTEN (thunk_fndecl) = 1;
+ funcn = cgraph_get_node (function);
+ gcc_checking_assert (funcn);
+ thunk_node = cgraph_add_thunk (funcn, thunk_fndecl, function,
+ this_adjusting, fixed_offset, virtual_value,
+ virtual_offset, alias);
+ if (DECL_ONE_ONLY (function))
+ cgraph_add_to_same_comdat_group (thunk_node, funcn);
- 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);
- init_insn_lengths ();
- current_function_decl = 0;
- cfun = 0;
- TREE_ASM_WRITTEN (thunk_fndecl) = 1;
- }
- else
+ if (!this_adjusting
+ || !targetm.asm_out.can_output_mi_thunk (thunk_fndecl, fixed_offset,
+ virtual_value, alias))
{
/* If this is a covariant thunk, or we don't have the necessary
code for efficient thunks, generate a thunk function that
if (varargs_function_p (function))
error ("generic thunk code fails for method %q#D which uses %<...%>",
function);
+ }
- DECL_RESULT (thunk_fndecl) = NULL_TREE;
-
- start_preparsed_function (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);
+ pop_from_top_level ();
+}
+\f
+/* Code for synthesizing methods which have default semantics defined. */
- /* 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;
+/* True iff CTYPE has a trivial SFK. */
- if (VOID_TYPE_P (TREE_TYPE (t)))
- finish_expr_stmt (t);
- else
- {
- if (!this_adjusting)
- {
- tree cond = NULL_TREE;
-
- if (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE)
- {
- /* If the return type is a pointer, we need to
- protect against NULL. We know there will be an
- adjustment, because that's why we're emitting a
- thunk. */
- t = save_expr (t);
- cond = cp_convert (boolean_type_node, t);
- }
-
- t = thunk_adjust (t, /*this_adjusting=*/0,
- fixed_offset, virtual_offset);
- if (cond)
- t = build3 (COND_EXPR, TREE_TYPE (t), cond, t,
- cp_convert (TREE_TYPE (t), integer_zero_node));
- }
- if (IS_AGGR_TYPE (TREE_TYPE (t)))
- t = build_cplus_new (TREE_TYPE (t), t);
- finish_return_stmt (t);
- }
+static bool
+type_has_trivial_fn (tree ctype, special_function_kind sfk)
+{
+ switch (sfk)
+ {
+ case sfk_constructor:
+ return !TYPE_HAS_COMPLEX_DFLT (ctype);
+ case sfk_copy_constructor:
+ return !TYPE_HAS_COMPLEX_COPY_CTOR (ctype);
+ case sfk_move_constructor:
+ return !TYPE_HAS_COMPLEX_MOVE_CTOR (ctype);
+ case sfk_copy_assignment:
+ return !TYPE_HAS_COMPLEX_COPY_ASSIGN (ctype);
+ case sfk_move_assignment:
+ return !TYPE_HAS_COMPLEX_MOVE_ASSIGN (ctype);
+ case sfk_destructor:
+ return !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (ctype);
+ default:
+ gcc_unreachable ();
+ }
+}
- /* Since we want to emit the thunk, we explicitly mark its name as
- referenced. */
- mark_decl_referenced (thunk_fndecl);
+/* Note that CTYPE has a non-trivial SFK even though we previously thought
+ it was trivial. */
- /* But we don't want debugging information about it. */
- DECL_IGNORED_P (thunk_fndecl) = 1;
+static void
+type_set_nontrivial_flag (tree ctype, special_function_kind sfk)
+{
+ switch (sfk)
+ {
+ case sfk_constructor:
+ TYPE_HAS_COMPLEX_DFLT (ctype) = true;
+ return;
+ case sfk_copy_constructor:
+ TYPE_HAS_COMPLEX_COPY_CTOR (ctype) = true;
+ return;
+ case sfk_move_constructor:
+ TYPE_HAS_COMPLEX_MOVE_CTOR (ctype) = true;
+ return;
+ case sfk_copy_assignment:
+ TYPE_HAS_COMPLEX_COPY_ASSIGN (ctype) = true;
+ return;
+ case sfk_move_assignment:
+ TYPE_HAS_COMPLEX_MOVE_ASSIGN (ctype) = true;
+ return;
+ case sfk_destructor:
+ TYPE_HAS_NONTRIVIAL_DESTRUCTOR (ctype) = true;
+ return;
+ default:
+ gcc_unreachable ();
+ }
+}
- /* Re-enable access control. */
- pop_deferring_access_checks ();
+/* True iff FN is a trivial defaulted member function ([cd]tor, op=). */
- thunk_fndecl = finish_function (0);
- tree_lowering_passes (thunk_fndecl);
- expand_body (thunk_fndecl);
- }
+bool
+trivial_fn_p (tree fn)
+{
+ if (!DECL_DEFAULTED_FN (fn))
+ return false;
- pop_from_top_level ();
+ /* If fn is a clone, get the primary variant. */
+ fn = DECL_ORIGIN (fn);
+ return type_has_trivial_fn (DECL_CONTEXT (fn), special_function_p (fn));
}
-\f
-/* Code for synthesizing methods which have default semantics defined. */
-/* Generate code for default X(X&) constructor. */
+/* Generate code for default X(X&) or X(X&&) constructor. */
static void
do_build_copy_constructor (tree fndecl)
{
tree parm = FUNCTION_FIRST_USER_PARM (fndecl);
+ bool move_p = DECL_MOVE_CONSTRUCTOR_P (fndecl);
+ bool trivial = trivial_fn_p (fndecl);
parm = convert_from_reference (parm);
- if (TYPE_HAS_TRIVIAL_INIT_REF (current_class_type)
+ if (trivial
&& 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))
+ else if (trivial)
{
tree t = build2 (INIT_EXPR, void_type_node, current_class_ref, parm);
finish_expr_stmt (t);
int cvquals = cp_type_quals (TREE_TYPE (parm));
int i;
tree binfo, base_binfo;
+ tree init;
VEC(tree,gc) *vbases;
/* Initialize all the base-classes with the parameter converted
for (vbases = CLASSTYPE_VBASECLASSES (current_class_type), i = 0;
VEC_iterate (tree, vbases, i, binfo); i++)
{
+ init = build_base_path (PLUS_EXPR, parm, binfo, 1,
+ tf_warning_or_error);
+ if (move_p)
+ init = move (init);
member_init_list
= tree_cons (binfo,
- build_tree_list (NULL_TREE,
- build_base_path (PLUS_EXPR, parm,
- binfo, 1)),
+ build_tree_list (NULL_TREE, init),
member_init_list);
}
if (BINFO_VIRTUAL_P (base_binfo))
continue;
+ init = build_base_path (PLUS_EXPR, parm, base_binfo, 1,
+ tf_warning_or_error);
+ if (move_p)
+ init = move (init);
member_init_list
= tree_cons (base_binfo,
- build_tree_list (NULL_TREE,
- build_base_path (PLUS_EXPR, parm,
- base_binfo, 1)),
+ build_tree_list (NULL_TREE, init),
member_init_list);
}
- for (; fields; fields = TREE_CHAIN (fields))
+ for (; fields; fields = DECL_CHAIN (fields))
{
- tree init = parm;
tree field = fields;
tree expr_type;
}
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. */;
+ nontrivial copy ctors or assignment ops or this
+ function would be deleted. */;
else
continue;
if (DECL_MUTABLE_P (field))
quals &= ~TYPE_QUAL_CONST;
+ quals |= cp_type_quals (expr_type);
expr_type = cp_build_qualified_type (expr_type, quals);
}
- init = build3 (COMPONENT_REF, expr_type, init, field, NULL_TREE);
+ init = build3 (COMPONENT_REF, expr_type, parm, field, NULL_TREE);
+ if (move_p && TREE_CODE (expr_type) != REFERENCE_TYPE)
+ init = move (init);
init = build_tree_list (NULL_TREE, init);
member_init_list = tree_cons (field, init, member_init_list);
}
static void
-do_build_assign_ref (tree fndecl)
+do_build_copy_assign (tree fndecl)
{
- tree parm = TREE_CHAIN (DECL_ARGUMENTS (fndecl));
+ tree parm = DECL_CHAIN (DECL_ARGUMENTS (fndecl));
tree compound_stmt;
+ bool move_p = move_fn_p (fndecl);
+ bool trivial = trivial_fn_p (fndecl);
+ int flags = LOOKUP_NORMAL | LOOKUP_NONVIRTUAL | LOOKUP_DEFAULTED;
compound_stmt = begin_compound_stmt (0);
parm = convert_from_reference (parm);
- if (TYPE_HAS_TRIVIAL_ASSIGN_REF (current_class_type)
+ if (trivial
&& 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))
+ else if (trivial)
{
tree t = build2 (MODIFY_EXPR, void_type_node, current_class_ref, parm);
finish_expr_stmt (t);
BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
{
tree converted_parm;
+ VEC(tree,gc) *parmvec;
/* 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, base_binfo, 1);
+ converted_parm = build_base_path (PLUS_EXPR, parm, base_binfo, 1,
+ tf_warning_or_error);
+ if (move_p)
+ converted_parm = move (converted_parm);
/* Call the base class assignment operator. */
+ parmvec = make_tree_vector_single (converted_parm);
finish_expr_stmt
(build_special_member_call (current_class_ref,
ansi_assopname (NOP_EXPR),
- build_tree_list (NULL_TREE,
- converted_parm),
+ &parmvec,
base_binfo,
- LOOKUP_NORMAL | LOOKUP_NONVIRTUAL));
+ flags,
+ tf_warning_or_error));
+ release_tree_vector (parmvec);
}
/* Assign to each of the non-static data members. */
for (fields = TYPE_FIELDS (current_class_type);
fields;
- fields = TREE_CHAIN (fields))
+ fields = DECL_CHAIN (fields))
{
tree comp = current_class_ref;
tree init = parm;
if (CP_TYPE_CONST_P (expr_type))
{
- error ("non-static const member %q#D, can't use default "
+ error ("non-static const member %q#D, can%'t use default "
"assignment operator", field);
continue;
}
else if (TREE_CODE (expr_type) == REFERENCE_TYPE)
{
- error ("non-static reference member %q#D, can't use "
+ error ("non-static reference member %q#D, can%'t use "
"default assignment operator", field);
continue;
}
else if (ANON_AGGR_TYPE_P (expr_type)
&& TYPE_FIELDS (expr_type) != NULL_TREE)
/* Just use the field; anonymous types can't have
- nontrivial copy ctors or assignment ops. */;
+ nontrivial copy ctors or assignment ops or this
+ function would be deleted. */;
else
continue;
expr_type = cp_build_qualified_type (expr_type, quals);
init = build3 (COMPONENT_REF, expr_type, init, field, NULL_TREE);
+ if (move_p && TREE_CODE (expr_type) != REFERENCE_TYPE)
+ init = move (init);
if (DECL_NAME (field))
- init = build_modify_expr (comp, NOP_EXPR, init);
+ init = cp_build_modify_expr (comp, NOP_EXPR, init,
+ tf_warning_or_error);
else
init = build2 (MODIFY_EXPR, TREE_TYPE (comp), comp, init);
finish_expr_stmt (init);
if (! context)
push_to_top_level ();
else if (nested)
- push_function_context_to (context);
+ push_function_context ();
input_location = DECL_SOURCE_LOCATION (fndecl);
if (DECL_OVERLOADED_OPERATOR_P (fndecl) == NOP_EXPR)
{
- do_build_assign_ref (fndecl);
+ do_build_copy_assign (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))
+ else
finish_mem_initializers (NULL_TREE);
}
if (! context)
pop_from_top_level ();
else if (nested)
- pop_function_context_from (context);
+ pop_function_context ();
pop_deferring_access_checks ();
if (error_count != errorcount || warning_count != warningcount)
- inform ("%Hsynthesized method %qD first required here ",
- &input_location, fndecl);
+ inform (input_location, "synthesized method %qD first required here ",
+ fndecl);
}
-/* 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. */
+/* Build a reference to type TYPE with cv-quals QUALS, which is an
+ rvalue if RVALUE is true. */
static tree
-synthesize_exception_spec (tree type, tree (*extractor) (tree, void*),
- void *client)
+build_stub_type (tree type, int quals, bool rvalue)
{
- tree raises = empty_except_spec;
- tree fields = TYPE_FIELDS (type);
- tree binfo, base_binfo;
- int i;
+ tree argtype = cp_build_qualified_type (type, quals);
+ return cp_build_reference_type (argtype, rvalue);
+}
+
+/* Build a dummy glvalue from dereferencing a dummy reference of type
+ REFTYPE. */
+
+static tree
+build_stub_object (tree reftype)
+{
+ tree stub = build1 (NOP_EXPR, reftype, integer_one_node);
+ return convert_from_reference (stub);
+}
+
+/* Determine which function will be called when looking up NAME in TYPE,
+ called with a single ARGTYPE argument, or no argument if ARGTYPE is
+ null. FLAGS and COMPLAIN are as for build_new_method_call.
+
+ Returns a FUNCTION_DECL if all is well.
+ Returns NULL_TREE if overload resolution failed.
+ Returns error_mark_node if the chosen function cannot be called. */
+
+static tree
+locate_fn_flags (tree type, tree name, tree argtype, int flags,
+ tsubst_flags_t complain)
+{
+ tree ob, fn, fns, binfo, rval;
+ VEC(tree,gc) *args;
+
+ if (TYPE_P (type))
+ binfo = TYPE_BINFO (type);
+ else
+ {
+ binfo = type;
+ type = BINFO_TYPE (binfo);
+ }
+
+ ob = build_stub_object (cp_build_reference_type (type, false));
+ args = make_tree_vector ();
+ if (argtype)
+ {
+ tree arg = build_stub_object (argtype);
+ VEC_quick_push (tree, args, arg);
+ }
+
+ fns = lookup_fnfields (binfo, name, 0);
+ rval = build_new_method_call (ob, fns, &args, binfo, flags, &fn, complain);
+
+ release_tree_vector (args);
+ if (fn && rval == error_mark_node)
+ return rval;
+ else
+ return fn;
+}
+
+/* Locate the dtor of TYPE. */
+
+tree
+get_dtor (tree type, tsubst_flags_t complain)
+{
+ tree fn = locate_fn_flags (type, complete_dtor_identifier, NULL_TREE,
+ LOOKUP_NORMAL, complain);
+ if (fn == error_mark_node)
+ return NULL_TREE;
+ return fn;
+}
+
+/* Locate the default ctor of TYPE. */
+
+tree
+locate_ctor (tree type)
+{
+ tree fn;
+
+ push_deferring_access_checks (dk_no_check);
+ fn = locate_fn_flags (type, complete_ctor_identifier, NULL_TREE,
+ LOOKUP_SPECULATIVE, tf_none);
+ pop_deferring_access_checks ();
+ if (fn == error_mark_node)
+ return NULL_TREE;
+ return fn;
+}
+
+/* Likewise, but give any appropriate errors. */
+
+tree
+get_default_ctor (tree type)
+{
+ tree fn = locate_fn_flags (type, complete_ctor_identifier, NULL_TREE,
+ LOOKUP_NORMAL, tf_warning_or_error);
+ if (fn == error_mark_node)
+ return NULL_TREE;
+ return fn;
+}
+
+/* Locate the copy ctor of TYPE. */
+
+tree
+get_copy_ctor (tree type, tsubst_flags_t complain)
+{
+ int quals = (TYPE_HAS_CONST_COPY_CTOR (type)
+ ? TYPE_QUAL_CONST : TYPE_UNQUALIFIED);
+ tree argtype = build_stub_type (type, quals, false);
+ tree fn = locate_fn_flags (type, complete_ctor_identifier, argtype,
+ LOOKUP_NORMAL, complain);
+ if (fn == error_mark_node)
+ return NULL_TREE;
+ return fn;
+}
+
+/* Locate the copy assignment operator of TYPE. */
+
+tree
+get_copy_assign (tree type)
+{
+ int quals = (TYPE_HAS_CONST_COPY_ASSIGN (type)
+ ? TYPE_QUAL_CONST : TYPE_UNQUALIFIED);
+ tree argtype = build_stub_type (type, quals, false);
+ tree fn = locate_fn_flags (type, ansi_assopname (NOP_EXPR), argtype,
+ LOOKUP_NORMAL, tf_warning_or_error);
+ if (fn == error_mark_node)
+ return NULL_TREE;
+ return fn;
+}
+
+/* Subroutine of synthesized_method_walk. Update SPEC_P, TRIVIAL_P and
+ DELETED_P or give an error message MSG with argument ARG. */
+
+static void
+process_subob_fn (tree fn, bool move_p, tree *spec_p, bool *trivial_p,
+ bool *deleted_p, bool *constexpr_p, bool *no_implicit_p,
+ const char *msg, tree arg)
+{
+ if (!fn || fn == error_mark_node)
+ goto bad;
+
+ if (spec_p)
+ {
+ tree raises = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn));
+ *spec_p = merge_exception_specifiers (*spec_p, raises, fn);
+ }
- for (binfo = TYPE_BINFO (type), i = 0;
- BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
+ if (!trivial_fn_p (fn))
{
- tree fn = (*extractor) (BINFO_TYPE (base_binfo), client);
- if (fn)
+ if (trivial_p)
+ *trivial_p = false;
+ if (TREE_CODE (arg) == FIELD_DECL
+ && TREE_CODE (DECL_CONTEXT (arg)) == UNION_TYPE)
{
- tree fn_raises = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn));
+ if (deleted_p)
+ *deleted_p = true;
+ if (msg)
+ error ("union member %q+D with non-trivial %qD", arg, fn);
+ }
+ }
- raises = merge_exception_specifiers (raises, fn_raises);
+ /* Core 1402: A non-trivial copy op suppresses the implicit
+ declaration of the move ctor/op=. */
+ if (no_implicit_p && move_p && !move_fn_p (fn) && !trivial_fn_p (fn))
+ *no_implicit_p = true;
+
+ if (constexpr_p && !DECL_DECLARED_CONSTEXPR_P (fn))
+ {
+ *constexpr_p = false;
+ if (msg)
+ {
+ inform (0, "defaulted constructor calls non-constexpr "
+ "%q+D", fn);
+ explain_invalid_constexpr_fn (fn);
}
}
- for (; fields; fields = TREE_CHAIN (fields))
+
+ return;
+
+ bad:
+ if (deleted_p)
+ *deleted_p = true;
+}
+
+/* Subroutine of synthesized_method_walk to allow recursion into anonymous
+ aggregates. */
+
+static void
+walk_field_subobs (tree fields, tree fnname, special_function_kind sfk,
+ int quals, bool copy_arg_p, bool move_p,
+ bool assign_p, tree *spec_p, bool *trivial_p,
+ bool *deleted_p, bool *constexpr_p, bool *no_implicit_p,
+ const char *msg, int flags, tsubst_flags_t complain)
+{
+ tree field;
+ for (field = fields; field; field = DECL_CHAIN (field))
{
- tree type = TREE_TYPE (fields);
- tree fn;
+ tree mem_type, argtype, rval;
- if (TREE_CODE (fields) != FIELD_DECL || DECL_ARTIFICIAL (fields))
+ if (TREE_CODE (field) != FIELD_DECL
+ || DECL_ARTIFICIAL (field))
continue;
- while (TREE_CODE (type) == ARRAY_TYPE)
- type = TREE_TYPE (type);
- if (!CLASS_TYPE_P (type))
+
+ mem_type = strip_array_types (TREE_TYPE (field));
+ if (assign_p)
+ {
+ bool bad = true;
+ if (CP_TYPE_CONST_P (mem_type) && !CLASS_TYPE_P (mem_type))
+ {
+ if (msg)
+ error ("non-static const member %q#D, can%'t use default "
+ "assignment operator", field);
+ }
+ else if (TREE_CODE (mem_type) == REFERENCE_TYPE)
+ {
+ if (msg)
+ error ("non-static reference member %q#D, can%'t use "
+ "default assignment operator", field);
+ }
+ else
+ bad = false;
+
+ if (bad && deleted_p)
+ *deleted_p = true;
+ }
+ else if (sfk == sfk_constructor)
+ {
+ bool bad;
+
+ if (DECL_INITIAL (field))
+ {
+ if (msg && DECL_INITIAL (field) == error_mark_node)
+ inform (0, "initializer for %q+#D is invalid", field);
+ if (trivial_p)
+ *trivial_p = false;
+#if 0
+ /* Core 1351: If the field has an NSDMI that could throw, the
+ default constructor is noexcept(false). FIXME this is
+ broken by deferred parsing and 1360 saying we can't lazily
+ declare a non-trivial default constructor. Also this
+ needs to do deferred instantiation. Disable until the
+ conflict between 1351 and 1360 is resolved. */
+ if (spec_p && !expr_noexcept_p (DECL_INITIAL (field), complain))
+ *spec_p = noexcept_false_spec;
+#endif
+
+ /* Don't do the normal processing. */
+ continue;
+ }
+
+ bad = false;
+ if (CP_TYPE_CONST_P (mem_type)
+ && default_init_uninitialized_part (mem_type))
+ {
+ if (msg)
+ error ("uninitialized non-static const member %q#D",
+ field);
+ bad = true;
+ }
+ else if (TREE_CODE (mem_type) == REFERENCE_TYPE)
+ {
+ if (msg)
+ error ("uninitialized non-static reference member %q#D",
+ field);
+ bad = true;
+ }
+
+ if (bad && deleted_p)
+ *deleted_p = true;
+
+ /* For an implicitly-defined default constructor to be constexpr,
+ every member must have a user-provided default constructor or
+ an explicit initializer. */
+ if (constexpr_p && !CLASS_TYPE_P (mem_type)
+ && TREE_CODE (DECL_CONTEXT (field)) != UNION_TYPE)
+ {
+ *constexpr_p = false;
+ if (msg)
+ inform (0, "defaulted default constructor does not "
+ "initialize %q+#D", field);
+ }
+ }
+
+ if (!CLASS_TYPE_P (mem_type))
continue;
- fn = (*extractor) (type, client);
- if (fn)
+ if (ANON_AGGR_TYPE_P (mem_type))
{
- tree fn_raises = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn));
+ walk_field_subobs (TYPE_FIELDS (mem_type), fnname, sfk, quals,
+ copy_arg_p, move_p, assign_p, spec_p, trivial_p,
+ deleted_p, constexpr_p, no_implicit_p,
+ msg, flags, complain);
+ continue;
+ }
- raises = merge_exception_specifiers (raises, fn_raises);
+ if (copy_arg_p)
+ {
+ int mem_quals = cp_type_quals (mem_type) | quals;
+ if (DECL_MUTABLE_P (field))
+ mem_quals &= ~TYPE_QUAL_CONST;
+ argtype = build_stub_type (mem_type, mem_quals, move_p);
}
+ else
+ argtype = NULL_TREE;
+
+ rval = locate_fn_flags (mem_type, fnname, argtype, flags, complain);
+
+ process_subob_fn (rval, move_p, spec_p, trivial_p, deleted_p,
+ constexpr_p, no_implicit_p, msg, field);
}
- return raises;
}
-/* Locate the dtor of TYPE. */
+/* The caller wants to generate an implicit declaration of SFK for CTYPE
+ which is const if relevant and CONST_P is set. If spec_p, trivial_p and
+ deleted_p are non-null, set their referent appropriately. If diag is
+ true, we're either being called from maybe_explain_implicit_delete to
+ give errors, or if constexpr_p is non-null, from
+ explain_invalid_constexpr_fn. */
-static tree
-locate_dtor (tree type, void *client ATTRIBUTE_UNUSED)
+static void
+synthesized_method_walk (tree ctype, special_function_kind sfk, bool const_p,
+ tree *spec_p, bool *trivial_p, bool *deleted_p,
+ bool *constexpr_p, bool *no_implicit_p, bool diag)
{
- return CLASSTYPE_DESTRUCTORS (type);
-}
+ tree binfo, base_binfo, scope, fnname, rval, argtype;
+ bool move_p, copy_arg_p, assign_p, expected_trivial, check_vdtor;
+ VEC(tree,gc) *vbases;
+ int i, quals, flags;
+ tsubst_flags_t complain;
+ const char *msg;
+ bool ctor_p;
-/* Locate the default ctor of TYPE. */
+ if (spec_p)
+ *spec_p = (cxx_dialect >= cxx0x ? noexcept_true_spec : empty_except_spec);
-static tree
-locate_ctor (tree type, void *client ATTRIBUTE_UNUSED)
-{
- tree fns;
+ if (no_implicit_p)
+ *no_implicit_p = false;
- if (!TYPE_HAS_DEFAULT_CONSTRUCTOR (type))
- return NULL_TREE;
+ if (deleted_p)
+ {
+ /* "The closure type associated with a lambda-expression has a deleted
+ default constructor and a deleted copy assignment operator."
+ This is diagnosed in maybe_explain_implicit_delete. */
+ if (LAMBDA_TYPE_P (ctype)
+ && (sfk == sfk_constructor
+ || sfk == sfk_copy_assignment))
+ {
+ *deleted_p = true;
+ return;
+ }
- /* Call lookup_fnfields_1 to create the constructor declarations, if
- necessary. */
- if (CLASSTYPE_LAZY_DEFAULT_CTOR (type))
- return lazily_declare_fn (sfk_constructor, type);
+ *deleted_p = false;
+ }
- for (fns = CLASSTYPE_CONSTRUCTORS (type); fns; fns = OVL_NEXT (fns))
+ ctor_p = false;
+ assign_p = false;
+ check_vdtor = false;
+ switch (sfk)
{
- tree fn = OVL_CURRENT (fns);
- tree parms = TYPE_ARG_TYPES (TREE_TYPE (fn));
+ case sfk_move_assignment:
+ case sfk_copy_assignment:
+ assign_p = true;
+ fnname = ansi_assopname (NOP_EXPR);
+ break;
- parms = skip_artificial_parms_for (fn, parms);
+ case sfk_destructor:
+ check_vdtor = true;
+ /* The synthesized method will call base dtors, but check complete
+ here to avoid having to deal with VTT. */
+ fnname = complete_dtor_identifier;
+ break;
- if (sufficient_parms_p (parms))
- return fn;
+ case sfk_constructor:
+ case sfk_move_constructor:
+ case sfk_copy_constructor:
+ ctor_p = true;
+ fnname = complete_ctor_identifier;
+ break;
+
+ default:
+ gcc_unreachable ();
}
- gcc_unreachable ();
-}
-struct copy_data
-{
- tree name;
- int quals;
-};
+ /* If that user-written default constructor would satisfy the
+ requirements of a constexpr constructor (7.1.5), the
+ implicitly-defined default constructor is constexpr. */
+ if (constexpr_p)
+ *constexpr_p = ctor_p;
+
+ move_p = false;
+ switch (sfk)
+ {
+ case sfk_constructor:
+ case sfk_destructor:
+ copy_arg_p = false;
+ break;
-/* 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. */
+ case sfk_move_constructor:
+ case sfk_move_assignment:
+ move_p = true;
+ case sfk_copy_constructor:
+ case sfk_copy_assignment:
+ copy_arg_p = true;
+ break;
-static tree
-locate_copy (tree type, void *client_)
-{
- struct copy_data *client = (struct copy_data *)client_;
- tree fns;
- tree best = NULL_TREE;
- bool excess_p = false;
+ default:
+ gcc_unreachable ();
+ }
- if (client->name)
+ expected_trivial = type_has_trivial_fn (ctype, sfk);
+ if (trivial_p)
+ *trivial_p = expected_trivial;
+
+ /* The TYPE_HAS_COMPLEX_* flags tell us about constraints from base
+ class versions and other properties of the type. But a subobject
+ class can be trivially copyable and yet have overload resolution
+ choose a template constructor for initialization, depending on
+ rvalueness and cv-quals. So we can't exit early for copy/move
+ methods in C++0x. The same considerations apply in C++98/03, but
+ there the definition of triviality does not consider overload
+ resolution, so a constructor can be trivial even if it would otherwise
+ call a non-trivial constructor. */
+ if (expected_trivial
+ && (!copy_arg_p || cxx_dialect < cxx0x))
{
- int ix;
- ix = lookup_fnfields_1 (type, client->name);
- if (ix < 0)
- return NULL_TREE;
- fns = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), ix);
+ if (constexpr_p && sfk == sfk_constructor)
+ {
+ bool cx = trivial_default_constructor_is_constexpr (ctype);
+ *constexpr_p = cx;
+ if (diag && !cx && TREE_CODE (ctype) == UNION_TYPE)
+ /* A trivial constructor doesn't have any NSDMI. */
+ inform (input_location, "defaulted default constructor does "
+ "not initialize any non-static data member");
+ }
+ if (!diag)
+ return;
}
- else if (TYPE_HAS_INIT_REF (type))
+
+ ++cp_unevaluated_operand;
+ ++c_inhibit_evaluation_warnings;
+
+ scope = push_scope (ctype);
+
+ if (diag)
{
- /* If construction of the copy constructor was postponed, create
- it now. */
- if (CLASSTYPE_LAZY_COPY_CTOR (type))
- lazily_declare_fn (sfk_copy_constructor, type);
- fns = CLASSTYPE_CONSTRUCTORS (type);
+ flags = LOOKUP_NORMAL|LOOKUP_SPECULATIVE|LOOKUP_DEFAULTED;
+ complain = tf_warning_or_error;
}
else
- return NULL_TREE;
- 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 = skip_artificial_parms_for (fn, parms);
- if (!parms)
- continue;
- src_type = non_reference (TREE_VALUE (parms));
+ flags = LOOKUP_PROTECT|LOOKUP_SPECULATIVE|LOOKUP_DEFAULTED;
+ complain = tf_none;
+ }
- if (src_type == error_mark_node)
- return NULL_TREE;
+ if (const_p)
+ quals = TYPE_QUAL_CONST;
+ else
+ quals = TYPE_UNQUALIFIED;
+ argtype = NULL_TREE;
+
+ if (!diag)
+ msg = NULL;
+ else if (assign_p)
+ msg = ("base %qT does not have a move assignment operator or trivial "
+ "copy assignment operator");
+ else
+ msg = ("base %qT does not have a move constructor or trivial "
+ "copy constructor");
- 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))
+ for (binfo = TYPE_BINFO (ctype), i = 0;
+ BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
+ {
+ tree basetype = BINFO_TYPE (base_binfo);
+ if (copy_arg_p)
+ argtype = build_stub_type (basetype, quals, move_p);
+ rval = locate_fn_flags (base_binfo, fnname, argtype, flags, complain);
+
+ process_subob_fn (rval, move_p, spec_p, trivial_p, deleted_p,
+ constexpr_p, no_implicit_p, msg, basetype);
+ if (ctor_p && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (basetype))
{
- best = fn;
- excess_p = excess;
+ /* In a constructor we also need to check the subobject
+ destructors for cleanup of partially constructed objects. */
+ rval = locate_fn_flags (base_binfo, complete_dtor_identifier,
+ NULL_TREE, flags, complain);
+ /* Note that we don't pass down trivial_p; the subobject
+ destructors don't affect triviality of the constructor. Nor
+ do they affect constexpr-ness (a constant expression doesn't
+ throw) or exception-specification (a throw from one of the
+ dtors would be a double-fault). */
+ process_subob_fn (rval, false, NULL, NULL,
+ deleted_p, NULL, NULL, NULL,
+ basetype);
+ }
+
+ if (check_vdtor && type_has_virtual_destructor (basetype))
+ {
+ rval = locate_fn_flags (ctype, ansi_opname (DELETE_EXPR),
+ ptr_type_node, flags, complain);
+ /* Unlike for base ctor/op=/dtor, for operator delete it's fine
+ to have a null rval (no class-specific op delete). */
+ if (rval && rval == error_mark_node && deleted_p)
+ *deleted_p = true;
+ check_vdtor = false;
}
- else
- /* Ambiguous */
- return NULL_TREE;
}
- return best;
+
+ vbases = CLASSTYPE_VBASECLASSES (ctype);
+ if (vbases && assign_p && move_p)
+ {
+ /* Should the spec be changed to allow vbases that only occur once? */
+ if (diag)
+ error ("%qT has virtual bases, default move assignment operator "
+ "cannot be generated", ctype);
+ else if (deleted_p)
+ *deleted_p = true;
+ }
+ else if (!assign_p)
+ {
+ if (diag)
+ msg = ("virtual base %qT does not have a move constructor "
+ "or trivial copy constructor");
+ if (vbases && constexpr_p)
+ *constexpr_p = false;
+ FOR_EACH_VEC_ELT (tree, vbases, i, base_binfo)
+ {
+ tree basetype = BINFO_TYPE (base_binfo);
+ if (copy_arg_p)
+ argtype = build_stub_type (basetype, quals, move_p);
+ rval = locate_fn_flags (base_binfo, fnname, argtype, flags, complain);
+
+ process_subob_fn (rval, move_p, spec_p, trivial_p, deleted_p,
+ constexpr_p, no_implicit_p, msg, basetype);
+ if (ctor_p && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (basetype))
+ {
+ rval = locate_fn_flags (base_binfo, complete_dtor_identifier,
+ NULL_TREE, flags, complain);
+ process_subob_fn (rval, false, NULL, NULL,
+ deleted_p, NULL, NULL, NULL,
+ basetype);
+ }
+ }
+ }
+ if (!diag)
+ /* Leave msg null. */;
+ else if (assign_p)
+ msg = ("non-static data member %qD does not have a move "
+ "assignment operator or trivial copy assignment operator");
+ else
+ msg = ("non-static data member %qD does not have a move "
+ "constructor or trivial copy constructor");
+ walk_field_subobs (TYPE_FIELDS (ctype), fnname, sfk, quals,
+ copy_arg_p, move_p, assign_p, spec_p, trivial_p,
+ deleted_p, constexpr_p, no_implicit_p,
+ msg, flags, complain);
+ if (ctor_p)
+ walk_field_subobs (TYPE_FIELDS (ctype), complete_dtor_identifier,
+ sfk_destructor, TYPE_UNQUALIFIED, false,
+ false, false, NULL, NULL,
+ deleted_p, NULL,
+ NULL, NULL, flags, complain);
+
+ pop_scope (scope);
+
+ --cp_unevaluated_operand;
+ --c_inhibit_evaluation_warnings;
+}
+
+/* DECL is a deleted function. If it's implicitly deleted, explain why and
+ return true; else return false. */
+
+bool
+maybe_explain_implicit_delete (tree decl)
+{
+ /* If decl is a clone, get the primary variant. */
+ decl = DECL_ORIGIN (decl);
+ gcc_assert (DECL_DELETED_FN (decl));
+ if (DECL_DEFAULTED_FN (decl))
+ {
+ /* Not marked GTY; it doesn't need to be GC'd or written to PCH. */
+ static struct pointer_set_t *explained;
+
+ special_function_kind sfk;
+ location_t loc;
+ bool informed;
+ tree ctype;
+
+ if (!explained)
+ explained = pointer_set_create ();
+ if (pointer_set_insert (explained, decl))
+ return true;
+
+ sfk = special_function_p (decl);
+ ctype = DECL_CONTEXT (decl);
+ loc = input_location;
+ input_location = DECL_SOURCE_LOCATION (decl);
+
+ informed = false;
+ if (LAMBDA_TYPE_P (ctype))
+ {
+ informed = true;
+ if (sfk == sfk_constructor)
+ inform (DECL_SOURCE_LOCATION (decl),
+ "a lambda closure type has a deleted default constructor");
+ else if (sfk == sfk_copy_assignment)
+ inform (DECL_SOURCE_LOCATION (decl),
+ "a lambda closure type has a deleted copy assignment operator");
+ else
+ informed = false;
+ }
+ else if (DECL_ARTIFICIAL (decl)
+ && (sfk == sfk_copy_assignment
+ || sfk == sfk_copy_constructor)
+ && (type_has_user_declared_move_constructor (ctype)
+ || type_has_user_declared_move_assign (ctype)))
+ {
+ inform (0, "%q+#D is implicitly declared as deleted because %qT "
+ "declares a move constructor or move assignment operator",
+ decl, ctype);
+ informed = true;
+ }
+ if (!informed)
+ {
+ tree parm_type = TREE_VALUE (FUNCTION_FIRST_USER_PARMTYPE (decl));
+ bool const_p = CP_TYPE_CONST_P (non_reference (parm_type));
+ tree scope = push_scope (ctype);
+ inform (0, "%q+#D is implicitly deleted because the default "
+ "definition would be ill-formed:", decl);
+ pop_scope (scope);
+ synthesized_method_walk (ctype, sfk, const_p,
+ NULL, NULL, NULL, NULL, NULL, true);
+ }
+
+ input_location = loc;
+ return true;
+ }
+ return false;
+}
+
+/* DECL is a defaulted function which was declared constexpr. Explain why
+ it can't be constexpr. */
+
+void
+explain_implicit_non_constexpr (tree decl)
+{
+ tree parm_type = TREE_VALUE (FUNCTION_FIRST_USER_PARMTYPE (decl));
+ bool const_p = CP_TYPE_CONST_P (non_reference (parm_type));
+ bool dummy;
+ synthesized_method_walk (DECL_CLASS_CONTEXT (decl),
+ special_function_p (decl), const_p,
+ NULL, NULL, NULL, &dummy, NULL, true);
}
/* Implicitly declare the special function indicated by KIND, as a
tree this_parm;
tree name;
HOST_WIDE_INT saved_processing_template_decl;
+ bool deleted_p;
+ bool trivial_p;
+ bool constexpr_p;
+ bool no_implicit_p;
/* Because we create declarations for implicitly declared functions
lazily, we may be creating the declaration for a member of TYPE
case sfk_destructor:
/* Destructor. */
name = constructor_name (type);
- raises = synthesize_exception_spec (type, &locate_dtor, 0);
break;
case sfk_constructor:
/* Default constructor. */
name = constructor_name (type);
- raises = synthesize_exception_spec (type, &locate_ctor, 0);
break;
case sfk_copy_constructor:
- case sfk_assignment_operator:
+ case sfk_copy_assignment:
+ case sfk_move_constructor:
+ case sfk_move_assignment:
{
- struct copy_data data;
-
- data.name = NULL;
- data.quals = 0;
- if (kind == sfk_assignment_operator)
+ bool move_p;
+ if (kind == sfk_copy_assignment
+ || kind == sfk_move_assignment)
{
return_type = build_reference_type (type);
name = ansi_assopname (NOP_EXPR);
- data.name = name;
}
else
name = constructor_name (type);
if (const_p)
- {
- data.quals = TYPE_QUAL_CONST;
- rhs_parm_type = build_qualified_type (type, TYPE_QUAL_CONST);
- }
+ rhs_parm_type = cp_build_qualified_type (type, TYPE_QUAL_CONST);
else
rhs_parm_type = type;
- rhs_parm_type = build_reference_type (rhs_parm_type);
+ move_p = (kind == sfk_move_assignment
+ || kind == sfk_move_constructor);
+ rhs_parm_type = cp_build_reference_type (rhs_parm_type, move_p);
+
parameter_types = tree_cons (NULL_TREE, rhs_parm_type, parameter_types);
- raises = synthesize_exception_spec (type, &locate_copy, &data);
break;
}
default:
gcc_unreachable ();
}
+ synthesized_method_walk (type, kind, const_p, &raises, &trivial_p,
+ &deleted_p, &constexpr_p, &no_implicit_p, false);
+ /* Don't bother marking a deleted constructor as constexpr. */
+ if (deleted_p)
+ constexpr_p = false;
+ /* A trivial copy/move constructor is also a constexpr constructor. */
+ else if (trivial_p && cxx_dialect >= cxx0x
+ && (kind == sfk_copy_constructor
+ || kind == sfk_move_constructor))
+ gcc_assert (constexpr_p);
+
+ if (!trivial_p && type_has_trivial_fn (type, kind))
+ type_set_nontrivial_flag (type, kind);
+
/* Create the function. */
fn_type = build_method_type_directly (type, return_type, parameter_types);
if (raises)
fn_type = build_exception_variant (fn_type, raises);
fn = build_lang_decl (FUNCTION_DECL, name, fn_type);
DECL_SOURCE_LOCATION (fn) = DECL_SOURCE_LOCATION (TYPE_NAME (type));
- if (kind == sfk_constructor || kind == sfk_copy_constructor)
+ if (kind == sfk_constructor || kind == sfk_copy_constructor
+ || kind == sfk_move_constructor)
DECL_CONSTRUCTOR_P (fn) = 1;
else if (kind == sfk_destructor)
DECL_DESTRUCTOR_P (fn) = 1;
DECL_ASSIGNMENT_OPERATOR_P (fn) = 1;
SET_OVERLOADED_OPERATOR_CODE (fn, NOP_EXPR);
}
+
+ /* If pointers to member functions use the least significant bit to
+ indicate whether a function is virtual, ensure a pointer
+ to this function will have that bit clear. */
+ if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
+ && DECL_ALIGN (fn) < 2 * BITS_PER_UNIT)
+ DECL_ALIGN (fn) = 2 * BITS_PER_UNIT;
+
/* Create the explicit arguments. */
if (rhs_parm_type)
{
/* Note that this parameter is *not* marked DECL_ARTIFICIAL; we
want its type to be included in the mangled function
name. */
- DECL_ARGUMENTS (fn) = cp_build_parm_decl (NULL_TREE, rhs_parm_type);
- TREE_READONLY (DECL_ARGUMENTS (fn)) = 1;
+ tree decl = cp_build_parm_decl (NULL_TREE, rhs_parm_type);
+ TREE_READONLY (decl) = 1;
+ retrofit_lang_decl (decl);
+ DECL_PARM_INDEX (decl) = DECL_PARM_LEVEL (decl) = 1;
+ DECL_ARGUMENTS (fn) = decl;
}
/* Add the "this" parameter. */
this_parm = build_this_parm (fn_type, TYPE_UNQUALIFIED);
- TREE_CHAIN (this_parm) = DECL_ARGUMENTS (fn);
+ DECL_CHAIN (this_parm) = DECL_ARGUMENTS (fn);
DECL_ARGUMENTS (fn) = this_parm;
grokclassfn (type, fn, kind == sfk_destructor ? DTOR_FLAG : NO_SPECIAL);
rest_of_decl_compilation (fn, toplevel_bindings_p (), at_eof);
DECL_IN_AGGR_P (fn) = 1;
DECL_ARTIFICIAL (fn) = 1;
+ DECL_DEFAULTED_FN (fn) = 1;
+ if (cxx_dialect >= cxx0x)
+ {
+ DECL_DELETED_FN (fn) = deleted_p;
+ DECL_DECLARED_CONSTEXPR_P (fn) = constexpr_p;
+ }
+ FNDECL_SUPPRESS_IMPLICIT_DECL (fn) = no_implicit_p;
+ DECL_EXTERNAL (fn) = true;
DECL_NOT_REALLY_EXTERN (fn) = 1;
DECL_DECLARED_INLINE_P (fn) = 1;
- DECL_INLINE (fn) = 1;
gcc_assert (!TREE_USED (fn));
/* Restore PROCESSING_TEMPLATE_DECL. */
return fn;
}
+/* Gives any errors about defaulted functions which need to be deferred
+ until the containing class is complete. */
+
+void
+defaulted_late_check (tree fn)
+{
+ /* Complain about invalid signature for defaulted fn. */
+ tree ctx = DECL_CONTEXT (fn);
+ special_function_kind kind = special_function_p (fn);
+ bool fn_const_p = (copy_fn_p (fn) == 2);
+ tree implicit_fn = implicitly_declare_fn (kind, ctx, fn_const_p);
+
+ if (!same_type_p (TREE_TYPE (TREE_TYPE (fn)),
+ TREE_TYPE (TREE_TYPE (implicit_fn)))
+ || !compparms (TYPE_ARG_TYPES (TREE_TYPE (fn)),
+ TYPE_ARG_TYPES (TREE_TYPE (implicit_fn))))
+ {
+ error ("defaulted declaration %q+D", fn);
+ error_at (DECL_SOURCE_LOCATION (fn),
+ "does not match expected signature %qD", implicit_fn);
+ }
+
+ /* 8.4.2/2: If it is explicitly defaulted on its first declaration, it is
+ implicitly considered to have the same exception-specification as if
+ it had been implicitly declared. */
+ if (DECL_DEFAULTED_IN_CLASS_P (fn))
+ {
+ tree eh_spec = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (implicit_fn));
+ if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
+ {
+ maybe_instantiate_noexcept (fn);
+ if (!comp_except_specs (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)),
+ eh_spec, ce_normal))
+ error ("function %q+D defaulted on its first declaration "
+ "with an exception-specification that differs from "
+ "the implicit declaration %q#D", fn, implicit_fn);
+ }
+ TREE_TYPE (fn) = build_exception_variant (TREE_TYPE (fn), eh_spec);
+ if (DECL_DECLARED_CONSTEXPR_P (implicit_fn))
+ {
+ /* Hmm...should we do this for out-of-class too? Should it be OK to
+ add constexpr later like inline, rather than requiring
+ declarations to match? */
+ DECL_DECLARED_CONSTEXPR_P (fn) = true;
+ if (kind == sfk_constructor)
+ TYPE_HAS_CONSTEXPR_CTOR (ctx) = true;
+ }
+ }
+
+ if (!DECL_DECLARED_CONSTEXPR_P (implicit_fn)
+ && DECL_DECLARED_CONSTEXPR_P (fn))
+ {
+ if (!CLASSTYPE_TEMPLATE_INSTANTIATION (ctx))
+ {
+ error ("explicitly defaulted function %q+D cannot be declared "
+ "as constexpr because the implicit declaration is not "
+ "constexpr:", fn);
+ explain_implicit_non_constexpr (fn);
+ }
+ DECL_DECLARED_CONSTEXPR_P (fn) = false;
+ }
+
+ if (DECL_DELETED_FN (implicit_fn))
+ DECL_DELETED_FN (fn) = 1;
+}
+
+/* Returns true iff FN can be explicitly defaulted, and gives any
+ errors if defaulting FN is ill-formed. */
+
+bool
+defaultable_fn_check (tree fn)
+{
+ special_function_kind kind = sfk_none;
+
+ if (template_parm_scope_p ())
+ {
+ error ("a template cannot be defaulted");
+ return false;
+ }
+
+ if (DECL_CONSTRUCTOR_P (fn))
+ {
+ if (FUNCTION_FIRST_USER_PARMTYPE (fn) == void_list_node)
+ kind = sfk_constructor;
+ else if (copy_fn_p (fn) > 0
+ && (TREE_CHAIN (FUNCTION_FIRST_USER_PARMTYPE (fn))
+ == void_list_node))
+ kind = sfk_copy_constructor;
+ else if (move_fn_p (fn))
+ kind = sfk_move_constructor;
+ }
+ else if (DECL_DESTRUCTOR_P (fn))
+ kind = sfk_destructor;
+ else if (DECL_ASSIGNMENT_OPERATOR_P (fn)
+ && DECL_OVERLOADED_OPERATOR_P (fn) == NOP_EXPR)
+ {
+ if (copy_fn_p (fn))
+ kind = sfk_copy_assignment;
+ else if (move_fn_p (fn))
+ kind = sfk_move_assignment;
+ }
+
+ if (kind == sfk_none)
+ {
+ error ("%qD cannot be defaulted", fn);
+ return false;
+ }
+ else
+ {
+ tree t = FUNCTION_FIRST_USER_PARMTYPE (fn);
+ for (; t && t != void_list_node; t = TREE_CHAIN (t))
+ if (TREE_PURPOSE (t))
+ {
+ error ("defaulted function %q+D with default argument", fn);
+ break;
+ }
+ if (TYPE_BEING_DEFINED (DECL_CONTEXT (fn)))
+ /* Defer checking. */;
+ else if (!processing_template_decl)
+ defaulted_late_check (fn);
+
+ return true;
+ }
+}
+
/* Add an implicit declaration to TYPE for the kind of function
indicated by SFK. Return the FUNCTION_DECL for the new implicit
declaration. */
lazily_declare_fn (special_function_kind sfk, tree type)
{
tree fn;
- bool const_p;
-
- /* Figure out whether or not the argument has a const reference
- type. */
- if (sfk == sfk_copy_constructor)
- const_p = TYPE_HAS_CONST_INIT_REF (type);
- else if (sfk == sfk_assignment_operator)
- const_p = TYPE_HAS_CONST_ASSIGN_REF (type);
- else
- /* In this case, CONST_P will be ignored. */
- const_p = false;
+ /* Whether or not the argument has a const reference type. */
+ bool const_p = false;
+
+ switch (sfk)
+ {
+ case sfk_constructor:
+ CLASSTYPE_LAZY_DEFAULT_CTOR (type) = 0;
+ break;
+ case sfk_copy_constructor:
+ const_p = TYPE_HAS_CONST_COPY_CTOR (type);
+ CLASSTYPE_LAZY_COPY_CTOR (type) = 0;
+ break;
+ case sfk_move_constructor:
+ CLASSTYPE_LAZY_MOVE_CTOR (type) = 0;
+ break;
+ case sfk_copy_assignment:
+ const_p = TYPE_HAS_CONST_COPY_ASSIGN (type);
+ CLASSTYPE_LAZY_COPY_ASSIGN (type) = 0;
+ break;
+ case sfk_move_assignment:
+ CLASSTYPE_LAZY_MOVE_ASSIGN (type) = 0;
+ break;
+ case sfk_destructor:
+ CLASSTYPE_LAZY_DESTRUCTOR (type) = 0;
+ break;
+ default:
+ gcc_unreachable ();
+ }
+
/* Declare the function. */
fn = implicitly_declare_fn (sfk, type, const_p);
+
+ /* [class.copy]/8 If the class definition declares a move constructor or
+ move assignment operator, the implicitly declared copy constructor is
+ defined as deleted.... */
+ if ((sfk == sfk_copy_assignment
+ || sfk == sfk_copy_constructor)
+ && (type_has_user_declared_move_constructor (type)
+ || type_has_user_declared_move_assign (type)))
+ DECL_DELETED_FN (fn) = true;
+
+ /* For move variants, rather than declare them as deleted we just
+ don't declare them at all. */
+ if (DECL_DELETED_FN (fn)
+ && (sfk == sfk_move_constructor
+ || sfk == sfk_move_assignment))
+ return NULL_TREE;
+
+ /* We also suppress implicit move if it would call a non-trivial copy. */
+ if (FNDECL_SUPPRESS_IMPLICIT_DECL (fn))
+ return NULL_TREE;
+
/* A destructor may be virtual. */
- if (sfk == sfk_destructor)
+ if (sfk == sfk_destructor
+ || sfk == sfk_move_assignment
+ || sfk == sfk_copy_assignment)
check_for_override (fn, type);
/* Add it to CLASSTYPE_METHOD_VEC. */
add_method (type, fn, NULL_TREE);
/* G++ 3.2 put the implicit destructor at the *beginning* of the
TYPE_METHODS list, which cause the destructor to be emitted
in an incorrect location in the vtable. */
- if (warn_abi && DECL_VIRTUAL_P (fn))
+ if (warn_abi && sfk == sfk_destructor && DECL_VIRTUAL_P (fn))
warning (OPT_Wabi, "vtable layout for class %qT may not be ABI-compliant"
"and may change in a future version of GCC due to "
"implicit virtual destructor",
type);
- TREE_CHAIN (fn) = TYPE_METHODS (type);
+ DECL_CHAIN (fn) = TYPE_METHODS (type);
TYPE_METHODS (type) = fn;
}
maybe_add_class_template_decl_list (type, fn, /*friend_p=*/0);
- if (sfk == sfk_assignment_operator)
- CLASSTYPE_LAZY_ASSIGNMENT_OP (type) = 0;
- else
- {
- /* Remember that the function has been created. */
- if (sfk == sfk_constructor)
- CLASSTYPE_LAZY_DEFAULT_CTOR (type) = 0;
- else if (sfk == sfk_copy_constructor)
- CLASSTYPE_LAZY_COPY_CTOR (type) = 0;
- else if (sfk == sfk_destructor)
- CLASSTYPE_LAZY_DESTRUCTOR (type) = 0;
- /* Create appropriate clones. */
- clone_function_decl (fn, /*update_method_vec=*/true);
- }
+ if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn)
+ || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn))
+ /* Create appropriate clones. */
+ clone_function_decl (fn, /*update_method_vec=*/true);
return fn;
}
as there are artificial parms in FN. */
tree
-skip_artificial_parms_for (tree fn, tree list)
+skip_artificial_parms_for (const_tree fn, tree list)
{
if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn))
list = TREE_CHAIN (list);
return list;
}
+/* Given a FUNCTION_DECL FN and a chain LIST, return the number of
+ artificial parms in FN. */
+
+int
+num_artificial_parms_for (const_tree fn)
+{
+ int count = 0;
+
+ if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn))
+ count++;
+ else
+ return 0;
+
+ if (DECL_HAS_IN_CHARGE_PARM_P (fn))
+ count++;
+ if (DECL_HAS_VTT_PARM_P (fn))
+ count++;
+ return count;
+}
+
+
#include "gt-cp-method.h"