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re PR c++/37208 (C++0x deleted functions and SFINAE)

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PR c++/37208
        * call.c (build_over_call): Make =delete work with SFINAE.
        * class.c (resolve_address_of_overloaded_function): Likewise.

        * cp-tree.h (struct lang_decl_flags): Rename threadprivate_p to
        threadprivate_or_deleted_p.
        (CP_DECL_THREADPRIVATE_P): Adjust.
        (DECL_DELETED_FN): Likewise.
        (SD_UNINITIALIZED, SD_INITIALIZED, SD_DEFAULTED): New macros.
        (SD_DELETED): New macro.
        * parser.c (cp_parser_init_declarator): Use them.
        * decl.c (start_decl): Use them.

        * decl2.c (mark_used): Give =deleted error even in sizeof.

        * typeck2.c (check_narrowing): Downgrade narrowing error to
        permerror.

From-SVN: r139926
This commit is contained in:
Jason Merrill 2008-09-03 00:10:27 -04:00 committed by Jason Merrill
parent a63068b6dd
commit 4ad610c978
9 changed files with 84 additions and 23 deletions
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20
gcc/cp/ChangeLog
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@ -1,3 +1,23 @@
2008-09-02 Jason Merrill <jason@redhat.com>
PR c++/37208
* call.c (build_over_call): Make =delete work with SFINAE.
* class.c (resolve_address_of_overloaded_function): Likewise.
* cp-tree.h (struct lang_decl_flags): Rename threadprivate_p to
threadprivate_or_deleted_p.
(CP_DECL_THREADPRIVATE_P): Adjust.
(DECL_DELETED_FN): Likewise.
(SD_UNINITIALIZED, SD_INITIALIZED, SD_DEFAULTED): New macros.
(SD_DELETED): New macro.
* parser.c (cp_parser_init_declarator): Use them.
* decl.c (start_decl): Use them.
* decl2.c (mark_used): Give =deleted error even in sizeof.
* typeck2.c (check_narrowing): Downgrade narrowing error to
permerror.
2008-09-02 Aldy Hernandez <aldyh@redhat.com>
* typeck.c (build_array_ref): Use new location argument.

4
gcc/cp/call.c
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@ -5119,6 +5119,10 @@ build_over_call (struct z_candidate *cand, int flags, tsubst_flags_t complain)
joust (cand, w->loser, 1);
}
/* Make =delete work with SFINAE. */
if (DECL_DELETED_FN (fn) && !(complain & tf_error))
return error_mark_node;
if (DECL_FUNCTION_MEMBER_P (fn))
{
/* If FN is a template function, two cases must be considered.

4
gcc/cp/class.c
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@ -6185,6 +6185,10 @@ resolve_address_of_overloaded_function (tree target_type,
function will be marked as used at this point. */
if (!(flags & tf_conv))
{
/* Make =delete work with SFINAE. */
if (DECL_DELETED_FN (fn) && !(flags & tf_error))
return error_mark_node;
mark_used (fn);
/* We could not check access when this expression was originally
created since we did not know at that time to which function

12
gcc/cp/cp-tree.h
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@ -1629,7 +1629,7 @@ struct lang_decl_flags GTY(())
unsigned this_thunk_p : 1;
unsigned repo_available_p : 1;
unsigned hidden_friend_p : 1;
unsigned threadprivate_p : 1;
unsigned threadprivate_or_deleted_p : 1;
unsigned defaulted_p : 1;
union lang_decl_u {
@ -2645,11 +2645,11 @@ more_aggr_init_expr_args_p (const aggr_init_expr_arg_iterator *iter)
/* Nonzero if DECL has been declared threadprivate by
#pragma omp threadprivate. */
#define CP_DECL_THREADPRIVATE_P(DECL) \
(DECL_LANG_SPECIFIC (VAR_DECL_CHECK (DECL))->decl_flags.threadprivate_p)
(DECL_LANG_SPECIFIC (VAR_DECL_CHECK (DECL))->decl_flags.threadprivate_or_deleted_p)
/* Nonzero if DECL was declared with '= delete'. */
#define DECL_DELETED_FN(DECL) \
(DECL_LANG_SPECIFIC (FUNCTION_DECL_CHECK (DECL))->decl_flags.threadprivate_p)
(DECL_LANG_SPECIFIC (FUNCTION_DECL_CHECK (DECL))->decl_flags.threadprivate_or_deleted_p)
/* Nonzero if DECL was declared with '= default'. */
#define DECL_DEFAULTED_FN(DECL) \
@ -3863,6 +3863,12 @@ enum overload_flags { NO_SPECIAL = 0, DTOR_FLAG, OP_FLAG, TYPENAME_FLAG };
#define SF_INCLASS_INLINE 2 /* The function is an inline, defined
in the class body. */
/* Used with start_decl's initialized parameter. */
#define SD_UNINITIALIZED 0
#define SD_INITIALIZED 1
#define SD_DEFAULTED 2
#define SD_DELETED 3
/* Returns nonzero iff TYPE1 and TYPE2 are the same type, or if TYPE2
is derived from TYPE1, or if TYPE2 is a pointer (reference) to a
class derived from the type pointed to (referred to) by TYPE1. */

18
gcc/cp/decl.c
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@ -3969,14 +3969,14 @@ groktypename (cp_decl_specifier_seq *type_specifiers,
grokfield.) The DECL corresponding to the DECLARATOR is returned.
If an error occurs, the error_mark_node is returned instead.
DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is 1
if an explicit initializer is present, or 2 for an explicitly defaulted
function, or 3 for an explicitly deleted function, but 0 if this is a
variable implicitly initialized via a default constructor. ATTRIBUTES
and PREFIX_ATTRIBUTES are GNU attributes associated with this
declaration. *PUSHED_SCOPE_P is set to the scope entered in this
function, if any; if set, the caller is responsible for calling
pop_scope. */
DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
for an explicitly defaulted function, or SD_DELETED for an explicitly
deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
implicitly initialized via a default constructor. ATTRIBUTES and
PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
*PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
set, the caller is responsible for calling pop_scope. */
tree
start_decl (const cp_declarator *declarator,
@ -4034,7 +4034,7 @@ start_decl (const cp_declarator *declarator,
return error_mark_node;
case FUNCTION_DECL:
if (initialized == 3)
if (initialized == SD_DELETED)
/* We'll handle the rest of the semantics later, but we need to
set this now so it's visible to duplicate_decls. */
DECL_DELETED_FN (decl) = 1;

12
gcc/cp/decl2.c
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@ -3767,6 +3767,12 @@ mark_used (tree decl)
TREE_USED (decl) = 1;
if (DECL_CLONED_FUNCTION_P (decl))
TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
if (TREE_CODE (decl) == FUNCTION_DECL
&& DECL_DELETED_FN (decl))
{
error ("deleted function %q+D", decl);
error ("used here");
}
/* If we don't need a value, then we don't need to synthesize DECL. */
if (skip_evaluation)
return;
@ -3830,12 +3836,6 @@ mark_used (tree decl)
/* If we've already synthesized the method we don't need to
do the instantiation test below. */
}
else if (TREE_CODE (decl) == FUNCTION_DECL
&& DECL_DELETED_FN (decl))
{
error ("deleted function %q+D", decl);
error ("used here");
}
else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
&& DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
&& (!DECL_EXPLICIT_INSTANTIATION (decl)

8
gcc/cp/parser.c
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@ -12610,7 +12610,7 @@ cp_parser_init_declarator (cp_parser* parser,
|| token->type == CPP_OPEN_PAREN
|| token->type == CPP_OPEN_BRACE)
{
is_initialized = 1;
is_initialized = SD_INITIALIZED;
initialization_kind = token->type;
if (token->type == CPP_EQ
@ -12618,9 +12618,9 @@ cp_parser_init_declarator (cp_parser* parser,
{
cp_token *t2 = cp_lexer_peek_nth_token (parser->lexer, 2);
if (t2->keyword == RID_DEFAULT)
is_initialized = 2;
is_initialized = SD_DEFAULTED;
else if (t2->keyword == RID_DELETE)
is_initialized = 3;
is_initialized = SD_DELETED;
}
}
else
@ -12633,7 +12633,7 @@ cp_parser_init_declarator (cp_parser* parser,
cp_parser_error (parser, "expected initializer");
return error_mark_node;
}
is_initialized = 0;
is_initialized = SD_UNINITIALIZED;
initialization_kind = CPP_EOF;
}

3
gcc/cp/typeck2.c
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@ -704,7 +704,8 @@ check_narrowing (tree type, tree init)
}
if (!ok)
error ("narrowing conversion of %qE to %qT inside { }", init, type);
permerror (input_location, "narrowing conversion of %qE to %qT inside { }",
init, type);
}
/* Process the initializer INIT for a variable of type TYPE, emitting

26
gcc/testsuite/g++.dg/cpp0x/defaulted4.C Normal file
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@ -0,0 +1,26 @@
// PR c++/37208: SFINAE and deleted functions.
// { dg-options "-std=c++0x" }
// { dg-do compile }
template<int> struct A { };
template<typename T>
int& int_if_addable(A<sizeof((*(T*)0) + (*(T*)0))>*);
template<typename T>
float& int_if_addable(...);
struct X { };
struct Y { };
Y operator+(Y, Y);
struct Z { };
Z operator+(Z, Z) = delete;
void f()
{
float& x = int_if_addable<X>(0);
int& y = int_if_addable<Y>(0);
float& z = int_if_addable<Z>(0);
}