static tree source_type (conversion *);
static void add_warning (struct z_candidate *, struct z_candidate *);
static bool reference_compatible_p (tree, tree);
-static conversion *convert_class_to_reference (tree, tree, tree, int);
static conversion *direct_reference_binding (tree, conversion *);
static bool promoted_arithmetic_type_p (tree);
static conversion *conditional_conversion (tree, tree);
}
}
+/* Update various flags in cfun and the call itself based on what is being
+ called. Split out of build_call_a so that bot_manip can use it too. */
+
+void
+set_flags_from_callee (tree call)
+{
+ int nothrow;
+ tree decl = get_callee_fndecl (call);
+
+ /* We check both the decl and the type; a function may be known not to
+ throw without being declared throw(). */
+ nothrow = ((decl && TREE_NOTHROW (decl))
+ || TYPE_NOTHROW_P (TREE_TYPE (TREE_TYPE (CALL_EXPR_FN (call)))));
+
+ if (!nothrow && at_function_scope_p () && cfun && cp_function_chain)
+ cp_function_chain->can_throw = 1;
+
+ if (decl && TREE_THIS_VOLATILE (decl) && cfun && cp_function_chain)
+ current_function_returns_abnormally = 1;
+
+ TREE_NOTHROW (call) = nothrow;
+}
+
tree
build_call_a (tree function, int n, tree *argarray)
{
- int is_constructor = 0;
- int nothrow;
tree decl;
tree result_type;
tree fntype;
if (SCALAR_TYPE_P (result_type) || VOID_TYPE_P (result_type))
result_type = cv_unqualified (result_type);
- if (TREE_CODE (function) == ADDR_EXPR
- && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL)
- {
- decl = TREE_OPERAND (function, 0);
- if (!TREE_USED (decl))
- {
- /* We invoke build_call directly for several library
- functions. These may have been declared normally if
- we're building libgcc, so we can't just check
- DECL_ARTIFICIAL. */
- gcc_assert (DECL_ARTIFICIAL (decl)
- || !strncmp (IDENTIFIER_POINTER (DECL_NAME (decl)),
- "__", 2));
- mark_used (decl);
- }
- }
- else
- decl = NULL_TREE;
-
- /* We check both the decl and the type; a function may be known not to
- throw without being declared throw(). */
- nothrow = ((decl && TREE_NOTHROW (decl))
- || TYPE_NOTHROW_P (TREE_TYPE (TREE_TYPE (function))));
+ function = build_call_array_loc (input_location,
+ result_type, function, n, argarray);
+ set_flags_from_callee (function);
- if (!nothrow && at_function_scope_p () && cfun && cp_function_chain)
- cp_function_chain->can_throw = 1;
+ decl = get_callee_fndecl (function);
- if (decl && TREE_THIS_VOLATILE (decl) && cfun && cp_function_chain)
- current_function_returns_abnormally = 1;
+ if (decl && !TREE_USED (decl))
+ {
+ /* We invoke build_call directly for several library
+ functions. These may have been declared normally if
+ we're building libgcc, so we can't just check
+ DECL_ARTIFICIAL. */
+ gcc_assert (DECL_ARTIFICIAL (decl)
+ || !strncmp (IDENTIFIER_POINTER (DECL_NAME (decl)),
+ "__", 2));
+ mark_used (decl);
+ }
if (decl && TREE_DEPRECATED (decl))
warn_deprecated_use (decl, NULL_TREE);
require_complete_eh_spec_types (fntype, decl);
- if (decl && DECL_CONSTRUCTOR_P (decl))
- is_constructor = 1;
+ TREE_HAS_CONSTRUCTOR (function) = (decl && DECL_CONSTRUCTOR_P (decl));
/* Don't pass empty class objects by value. This is useful
for tags in STL, which are used to control overload resolution.
We don't need to handle other cases of copying empty classes. */
if (! decl || ! DECL_BUILT_IN (decl))
for (i = 0; i < n; i++)
- if (is_empty_class (TREE_TYPE (argarray[i]))
- && ! TREE_ADDRESSABLE (TREE_TYPE (argarray[i])))
- {
- tree t = build0 (EMPTY_CLASS_EXPR, TREE_TYPE (argarray[i]));
- argarray[i] = build2 (COMPOUND_EXPR, TREE_TYPE (t),
- argarray[i], t);
- }
-
- function = build_call_array_loc (input_location,
- result_type, function, n, argarray);
- TREE_HAS_CONSTRUCTOR (function) = is_constructor;
- TREE_NOTHROW (function) = nothrow;
+ {
+ tree arg = CALL_EXPR_ARG (function, i);
+ if (is_empty_class (TREE_TYPE (arg))
+ && ! TREE_ADDRESSABLE (TREE_TYPE (arg)))
+ {
+ tree t = build0 (EMPTY_CLASS_EXPR, TREE_TYPE (arg));
+ arg = build2 (COMPOUND_EXPR, TREE_TYPE (t), arg, t);
+ CALL_EXPR_ARG (function, i) = arg;
+ }
+ }
return function;
}
rr_none,
rr_arity,
rr_explicit_conversion,
+ rr_template_conversion,
rr_arg_conversion,
rr_bad_arg_conversion,
rr_template_unification,
return true;
if (CP_INTEGRAL_TYPE_P (TREE_TYPE (t)))
{
- if (cxx_dialect >= cxx0x)
- {
- t = fold_non_dependent_expr (t);
- t = maybe_constant_value (t);
- if (TREE_CONSTANT (t) && integer_zerop (t))
- return true;
- }
- else
+ /* Core issue 903 says only literal 0 is a null pointer constant. */
+ if (cxx_dialect < cxx0x)
{
t = integral_constant_value (t);
STRIP_NOPS (t);
- if (integer_zerop (t) && !TREE_OVERFLOW (t))
- return true;
}
+ if (integer_zerop (t) && !TREE_OVERFLOW (t))
+ return true;
}
return false;
}
+/* Returns true iff T is a null member pointer value (4.11). */
+
+bool
+null_member_pointer_value_p (tree t)
+{
+ tree type = TREE_TYPE (t);
+ if (!type)
+ return false;
+ else if (TYPE_PTRMEMFUNC_P (type))
+ return (TREE_CODE (t) == CONSTRUCTOR
+ && integer_zerop (CONSTRUCTOR_ELT (t, 0)->value));
+ else if (TYPE_PTRMEM_P (type))
+ return integer_all_onesp (t);
+ else
+ return false;
+}
+
/* Returns nonzero if PARMLIST consists of only default parms,
ellipsis, and/or undeduced parameter packs. */
}
static struct rejection_reason *
+template_conversion_rejection (tree from, tree to)
+{
+ struct rejection_reason *r = alloc_rejection (rr_template_conversion);
+ r->u.conversion.n_arg = 0;
+ r->u.conversion.from_type = from;
+ r->u.conversion.to_type = to;
+ return r;
+}
+
+static struct rejection_reason *
template_unification_rejection (tree tmpl, tree explicit_targs, tree targs,
const tree *args, unsigned int nargs,
tree return_type, unification_kind_t strict,
&& at_least_as_qualified_p (t1, t2));
}
-/* Determine whether or not the EXPR (of class type S) can be
- converted to T as in [over.match.ref]. */
-
-static conversion *
-convert_class_to_reference_1 (tree reference_type, tree s, tree expr, int flags)
-{
- tree conversions;
- tree first_arg;
- conversion *conv;
- tree t;
- struct z_candidate *candidates;
- struct z_candidate *cand;
- bool any_viable_p;
-
- if (!expr)
- return NULL;
-
- conversions = lookup_conversions (s);
- if (!conversions)
- return NULL;
-
- /* [over.match.ref]
-
- Assuming that "cv1 T" is the underlying type of the reference
- being initialized, and "cv S" is the type of the initializer
- expression, with S a class type, the candidate functions are
- selected as follows:
-
- --The conversion functions of S and its base classes are
- considered. Those that are not hidden within S and yield type
- "reference to cv2 T2", where "cv1 T" is reference-compatible
- (_dcl.init.ref_) with "cv2 T2", are candidate functions.
-
- The argument list has one argument, which is the initializer
- expression. */
-
- candidates = 0;
-
- /* Conceptually, we should take the address of EXPR and put it in
- the argument list. Unfortunately, however, that can result in
- error messages, which we should not issue now because we are just
- trying to find a conversion operator. Therefore, we use NULL,
- cast to the appropriate type. */
- first_arg = build_int_cst (build_pointer_type (s), 0);
-
- t = TREE_TYPE (reference_type);
-
- /* We're performing a user-defined conversion to a desired type, so set
- this for the benefit of add_candidates. */
- flags |= LOOKUP_NO_CONVERSION;
-
- for (; conversions; conversions = TREE_CHAIN (conversions))
- {
- tree fns = TREE_VALUE (conversions);
- tree binfo = TREE_PURPOSE (conversions);
- struct z_candidate *old_candidates = candidates;;
-
- add_candidates (fns, first_arg, NULL, reference_type,
- NULL_TREE, false,
- binfo, TYPE_BINFO (s),
- flags, &candidates);
-
- for (cand = candidates; cand != old_candidates; cand = cand->next)
- {
- /* Now, see if the conversion function really returns
- an lvalue of the appropriate type. From the
- point of view of unification, simply returning an
- rvalue of the right type is good enough. */
- tree f = cand->fn;
- tree t2 = TREE_TYPE (TREE_TYPE (f));
- if (cand->viable == 0)
- /* Don't bother looking more closely. */;
- else if (TREE_CODE (t2) != REFERENCE_TYPE
- || !reference_compatible_p (t, TREE_TYPE (t2)))
- {
- /* No need to set cand->reason here; this is most likely
- an ambiguous match. If it's not, either this candidate
- will win, or we will have identified a reason for it
- losing already. */
- cand->viable = 0;
- }
- else
- {
- conversion *identity_conv;
- /* Build a standard conversion sequence indicating the
- binding from the reference type returned by the
- function to the desired REFERENCE_TYPE. */
- identity_conv
- = build_identity_conv (TREE_TYPE (TREE_TYPE
- (TREE_TYPE (cand->fn))),
- NULL_TREE);
- cand->second_conv
- = (direct_reference_binding
- (reference_type, identity_conv));
- cand->second_conv->rvaluedness_matches_p
- = TYPE_REF_IS_RVALUE (TREE_TYPE (TREE_TYPE (cand->fn)))
- == TYPE_REF_IS_RVALUE (reference_type);
- cand->second_conv->bad_p |= cand->convs[0]->bad_p;
-
- /* Don't allow binding of lvalues to rvalue references. */
- if (TYPE_REF_IS_RVALUE (reference_type)
- /* Function lvalues are OK, though. */
- && TREE_CODE (TREE_TYPE (reference_type)) != FUNCTION_TYPE
- && !TYPE_REF_IS_RVALUE (TREE_TYPE (TREE_TYPE (cand->fn))))
- cand->second_conv->bad_p = true;
- }
- }
- }
-
- candidates = splice_viable (candidates, pedantic, &any_viable_p);
- /* If none of the conversion functions worked out, let our caller
- know. */
- if (!any_viable_p)
- return NULL;
-
- cand = tourney (candidates);
- if (!cand)
- return NULL;
-
- /* Now that we know that this is the function we're going to use fix
- the dummy first argument. */
- gcc_assert (cand->first_arg == NULL_TREE
- || integer_zerop (cand->first_arg));
- cand->first_arg = build_this (expr);
-
- /* Build a user-defined conversion sequence representing the
- conversion. */
- conv = build_conv (ck_user,
- TREE_TYPE (TREE_TYPE (cand->fn)),
- build_identity_conv (TREE_TYPE (expr), expr));
- conv->cand = cand;
-
- if (cand->viable == -1)
- conv->bad_p = true;
-
- /* Merge it with the standard conversion sequence from the
- conversion function's return type to the desired type. */
- cand->second_conv = merge_conversion_sequences (conv, cand->second_conv);
-
- return cand->second_conv;
-}
-
-/* Wrapper for above. */
-
-static conversion *
-convert_class_to_reference (tree reference_type, tree s, tree expr, int flags)
-{
- conversion *ret;
- bool subtime = timevar_cond_start (TV_OVERLOAD);
- ret = convert_class_to_reference_1 (reference_type, s, expr, flags);
- timevar_cond_stop (TV_OVERLOAD, subtime);
- return ret;
-}
-
/* A reference of the indicated TYPE is being bound directly to the
expression represented by the implicit conversion sequence CONV.
Return a conversion sequence for this binding. */
tree tfrom;
bool related_p;
bool compatible_p;
- cp_lvalue_kind is_lvalue = clk_none;
+ cp_lvalue_kind gl_kind;
+ bool is_lvalue;
if (TREE_CODE (to) == FUNCTION_TYPE && expr && type_unknown_p (expr))
{
from = TREE_TYPE (expr);
}
- if (TREE_CODE (from) == REFERENCE_TYPE)
- {
- /* Anything with reference type is an lvalue. */
- is_lvalue = clk_ordinary;
- from = TREE_TYPE (from);
- }
-
if (expr && BRACE_ENCLOSED_INITIALIZER_P (expr))
{
maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
}
}
- if (is_lvalue == clk_none && expr)
- is_lvalue = real_lvalue_p (expr);
+ if (TREE_CODE (from) == REFERENCE_TYPE)
+ {
+ from = TREE_TYPE (from);
+ if (!TYPE_REF_IS_RVALUE (rfrom)
+ || TREE_CODE (from) == FUNCTION_TYPE)
+ gl_kind = clk_ordinary;
+ else
+ gl_kind = clk_rvalueref;
+ }
+ else if (expr)
+ {
+ gl_kind = lvalue_kind (expr);
+ if (gl_kind & clk_class)
+ /* A class prvalue is not a glvalue. */
+ gl_kind = clk_none;
+ }
+ else
+ gl_kind = clk_none;
+ is_lvalue = gl_kind && !(gl_kind & clk_rvalueref);
tfrom = from;
- if ((is_lvalue & clk_bitfield) != 0)
+ if ((gl_kind & clk_bitfield) != 0)
tfrom = unlowered_expr_type (expr);
/* Figure out whether or not the types are reference-related and
the reference and expression is an lvalue. In DR391, the wording in
[8.5.3/5 dcl.init.ref] is changed to also require direct bindings for
const and rvalue references to rvalues of compatible class type.
- We should also do direct bindings for non-class "rvalues" derived from
- rvalue references. */
+ We should also do direct bindings for non-class xvalues. */
if (compatible_p
&& (is_lvalue
|| (((CP_TYPE_CONST_NON_VOLATILE_P (to)
- && !(flags & LOOKUP_NO_TEMP_BIND))
+ && !(flags & LOOKUP_NO_RVAL_BIND))
|| TYPE_REF_IS_RVALUE (rto))
- && (CLASS_TYPE_P (from)
- || TREE_CODE (from) == ARRAY_TYPE
- || (expr && lvalue_p (expr))))))
+ && (gl_kind
+ || (!(flags & LOOKUP_NO_TEMP_BIND)
+ && (CLASS_TYPE_P (from)
+ || TREE_CODE (from) == ARRAY_TYPE))))))
{
/* [dcl.init.ref]
/* The top-level caller requested that we pretend that the lvalue
be treated as an rvalue. */
conv->rvaluedness_matches_p = TYPE_REF_IS_RVALUE (rto);
+ else if (TREE_CODE (rfrom) == REFERENCE_TYPE)
+ /* Handle rvalue reference to function properly. */
+ conv->rvaluedness_matches_p
+ = (TYPE_REF_IS_RVALUE (rto) == TYPE_REF_IS_RVALUE (rfrom));
else
conv->rvaluedness_matches_p
= (TYPE_REF_IS_RVALUE (rto) == !is_lvalue);
- if ((is_lvalue & clk_bitfield) != 0
- || ((is_lvalue & clk_packed) != 0 && !TYPE_PACKED (to)))
+ if ((gl_kind & clk_bitfield) != 0
+ || ((gl_kind & clk_packed) != 0 && !TYPE_PACKED (to)))
/* For the purposes of overload resolution, we ignore the fact
this expression is a bitfield or packed field. (In particular,
[over.ics.ref] says specifically that a function with a
the reference is bound to the lvalue result of the conversion
in the second case. */
- conv = convert_class_to_reference (rto, from, expr, flags);
- if (conv)
- return conv;
+ z_candidate *cand = build_user_type_conversion_1 (rto, expr, flags);
+ if (cand)
+ return cand->second_conv;
}
/* From this point on, we conceptually need temporaries, even if we
|| expr == error_mark_node)
return NULL;
+ /* Other flags only apply to the primary function in overload
+ resolution, or after we've chosen one. */
+ flags &= (LOOKUP_ONLYCONVERTING|LOOKUP_NO_CONVERSION|LOOKUP_COPY_PARM
+ |LOOKUP_NO_TEMP_BIND|LOOKUP_NO_RVAL_BIND|LOOKUP_PREFER_RVALUE
+ |LOOKUP_NO_NARROWING|LOOKUP_PROTECT);
+
if (TREE_CODE (to) == REFERENCE_TYPE)
conv = reference_binding (to, from, expr, c_cast_p, flags);
else
&& (flags & LOOKUP_NO_CONVERSION) == 0)
{
struct z_candidate *cand;
- int convflags = (flags & (LOOKUP_NO_TEMP_BIND|LOOKUP_ONLYCONVERTING
- |LOOKUP_NO_NARROWING));
if (CLASS_TYPE_P (to)
- && !CLASSTYPE_NON_AGGREGATE (complete_type (to))
- && BRACE_ENCLOSED_INITIALIZER_P (expr))
+ && BRACE_ENCLOSED_INITIALIZER_P (expr)
+ && !CLASSTYPE_NON_AGGREGATE (complete_type (to)))
return build_aggr_conv (to, expr, flags);
- cand = build_user_type_conversion_1 (to, expr, convflags);
+ cand = build_user_type_conversion_1 (to, expr, flags);
if (cand)
conv = cand->second_conv;
"conversion", r->u.conversion.from_type,
r->u.conversion.to_type);
break;
+ case rr_template_conversion:
+ inform (loc, " conversion from return type %qT of template "
+ "conversion function specialization to %qT is not an "
+ "exact match", r->u.conversion.from_type,
+ r->u.conversion.to_type);
+ break;
case rr_template_unification:
/* We use template_unification_error_rejection if unification caused
actual non-SFINAE errors, in which case we don't need to repeat
merge_conversion_sequences (conversion *user_seq, conversion *std_seq)
{
conversion **t;
+ bool bad = user_seq->bad_p;
gcc_assert (user_seq->kind == ck_user);
/* Find the end of the second conversion sequence. */
- t = &(std_seq);
- while ((*t)->kind != ck_identity)
- t = &((*t)->u.next);
+ for (t = &std_seq; (*t)->kind != ck_identity; t = &((*t)->u.next))
+ {
+ /* The entire sequence is a user-conversion sequence. */
+ (*t)->user_conv_p = true;
+ if (bad)
+ (*t)->bad_p = true;
+ }
/* Replace the identity conversion with the user conversion
sequence. */
*t = user_seq;
- /* The entire sequence is a user-conversion sequence. */
- std_seq->user_conv_p = true;
-
return std_seq;
}
/* Returns the best overload candidate to perform the requested
conversion. This function is used for three the overloading situations
described in [over.match.copy], [over.match.conv], and [over.match.ref].
- If TOTYPE is a REFERENCE_TYPE, we're trying to find an lvalue binding as
+ If TOTYPE is a REFERENCE_TYPE, we're trying to find a direct binding as
per [dcl.init.ref], so we ignore temporary bindings. */
static struct z_candidate *
struct z_candidate *old_candidates;
/* If we are called to convert to a reference type, we are trying to
- find an lvalue binding, so don't even consider temporaries. If
- we don't find an lvalue binding, the caller will try again to
+ find a direct binding, so don't even consider temporaries. If
+ we don't find a direct binding, the caller will try again to
look for a temporary binding. */
if (TREE_CODE (totype) == REFERENCE_TYPE)
convflags |= LOOKUP_NO_TEMP_BIND;
yield type T or a type that can be converted to type T
with a qualification conversion (4.4) are also candidate
functions. */
+ /* 13.3.1.6 doesn't have a parallel restriction, but it should;
+ I've raised this issue with the committee. --jason 9/2011 */
cand->viable = -1;
cand->reason = explicit_conversion_rejection (rettype, totype);
}
= bad_arg_conversion_rejection (NULL_TREE, -1,
rettype, totype);
}
+ else if (primary_template_instantiation_p (cand->fn)
+ && ics->rank > cr_exact)
+ {
+ /* 13.3.3.1.2: If the user-defined conversion is specified by
+ a specialization of a conversion function template, the
+ second standard conversion sequence shall have exact match
+ rank. */
+ cand->viable = -1;
+ cand->reason = template_conversion_rejection (rettype, totype);
+ }
}
}
? totype : non_reference (TREE_TYPE (TREE_TYPE (cand->fn)))),
build_identity_conv (TREE_TYPE (expr), expr));
conv->cand = cand;
+ if (cand->viable == -1)
+ conv->bad_p = true;
/* Remember that this was a list-initialization. */
if (flags & LOOKUP_NO_NARROWING)
cand->second_conv = merge_conversion_sequences (conv,
cand->second_conv);
- if (cand->viable == -1)
- cand->second_conv->bad_p = true;
-
return cand;
}
/* [expr.cond]
If E2 is an lvalue: E1 can be converted to match E2 if E1 can be
- implicitly converted (clause _conv_) to the type "reference to
+ implicitly converted (clause _conv_) to the type "lvalue reference to
T2", subject to the constraint that in the conversion the
- reference must bind directly (_dcl.init.ref_) to E1. */
+ reference must bind directly (_dcl.init.ref_) to an lvalue. */
if (real_lvalue_p (e2))
{
conv = implicit_conversion (build_reference_type (t2),
t1,
e1,
/*c_cast_p=*/false,
- LOOKUP_NO_TEMP_BIND|LOOKUP_ONLYCONVERTING);
+ LOOKUP_NO_TEMP_BIND|LOOKUP_NO_RVAL_BIND
+ |LOOKUP_ONLYCONVERTING);
if (conv)
return conv;
}
diagnostic_t diag_kind;
int flags;
+ if (convs->bad_p && !(complain & tf_error))
+ return error_mark_node;
+
if (convs->bad_p
&& convs->kind != ck_user
&& convs->kind != ck_list
&& convs->kind != ck_ambig
- && convs->kind != ck_ref_bind
+ && (convs->kind != ck_ref_bind
+ || convs->user_conv_p)
&& convs->kind != ck_rvalue
&& convs->kind != ck_base)
{
&& BRACE_ENCLOSED_INITIALIZER_P (CONSTRUCTOR_ELT (expr, 0)->value))
permerror (input_location, "too many braces around initializer for %qT", totype);
- for (; t; t = convs->u.next)
+ for (; t; t = t->u.next)
{
if (t->kind == ck_user && t->cand->reason)
{
/*issue_conversion_warnings=*/false,
/*c_cast_p=*/false,
complain);
- return cp_convert (totype, expr);
+ if (convs->kind == ck_ref_bind)
+ return convert_to_reference (totype, expr, CONV_IMPLICIT,
+ LOOKUP_NORMAL, NULL_TREE);
+ else
+ return cp_convert (totype, expr);
}
else if (t->kind == ck_user || !t->bad_p)
{
else if (t->kind == ck_identity)
break;
}
- if (complain & tf_error)
- {
- permerror (input_location, "invalid conversion from %qT to %qT", TREE_TYPE (expr), totype);
- if (fn)
- permerror (DECL_SOURCE_LOCATION (fn),
- " initializing argument %P of %qD", argnum, fn);
- }
- else
- return error_mark_node;
+
+ permerror (input_location, "invalid conversion from %qT to %qT",
+ TREE_TYPE (expr), totype);
+ if (fn)
+ permerror (DECL_SOURCE_LOCATION (fn),
+ " initializing argument %P of %qD", argnum, fn);
return cp_convert (totype, expr);
}
/* When converting from an init list we consider explicit
constructors, but actually trying to call one is an error. */
if (DECL_NONCONVERTING_P (convfn) && DECL_CONSTRUCTOR_P (convfn)
+ /* Unless this is for direct-list-initialization. */
+ && !(BRACE_ENCLOSED_INITIALIZER_P (expr)
+ && CONSTRUCTOR_IS_DIRECT_INIT (expr))
/* Unless we're calling it for value-initialization from an
empty list, since that is handled separately in 8.5.4. */
&& cand->num_convs > 0)
{
- if (complain & tf_error)
- error ("converting to %qT from initializer list would use "
- "explicit constructor %qD", totype, convfn);
- else
- return error_mark_node;
+ error ("converting to %qT from initializer list would use "
+ "explicit constructor %qD", totype, convfn);
}
/* Set user_conv_p on the argument conversions, so rvalue/base
}
return expr;
case ck_ambig:
+ /* We leave bad_p off ck_ambig because overload resolution considers
+ it valid, it just fails when we try to perform it. So we need to
+ check complain here, too. */
if (complain & tf_error)
{
/* Call build_user_type_conversion again for the error. */
/* Copy-list-initialization doesn't actually involve a copy. */
return expr;
expr = build_temp (expr, totype, flags, &diag_kind, complain);
- if (diag_kind && fn)
- {
- if ((complain & tf_error))
- emit_diagnostic (diag_kind, DECL_SOURCE_LOCATION (fn), 0,
- " initializing argument %P of %qD", argnum, fn);
- else if (diag_kind == DK_ERROR)
- return error_mark_node;
- }
+ if (diag_kind && fn && complain)
+ emit_diagnostic (diag_kind, DECL_SOURCE_LOCATION (fn), 0,
+ " initializing argument %P of %qD", argnum, fn);
return build_cplus_new (totype, expr, complain);
case ck_ref_bind:
{
tree ref_type = totype;
- if (convs->bad_p && TYPE_REF_IS_RVALUE (ref_type)
- && real_lvalue_p (expr))
+ if (convs->bad_p && !convs->u.next->bad_p)
{
- if (complain & tf_error)
- {
- error ("cannot bind %qT lvalue to %qT",
- TREE_TYPE (expr), totype);
- if (fn)
- error (" initializing argument %P of %q+D", argnum, fn);
- }
+ gcc_assert (TYPE_REF_IS_RVALUE (ref_type)
+ && real_lvalue_p (expr));
+
+ error ("cannot bind %qT lvalue to %qT",
+ TREE_TYPE (expr), totype);
+ if (fn)
+ error (" initializing argument %P of %q+D", argnum, fn);
return error_mark_node;
}
if (!CP_TYPE_CONST_NON_VOLATILE_P (type)
&& !TYPE_REF_IS_RVALUE (ref_type))
{
- if (complain & tf_error)
- {
- /* If the reference is volatile or non-const, we
- cannot create a temporary. */
- if (lvalue & clk_bitfield)
- error ("cannot bind bitfield %qE to %qT",
- expr, ref_type);
- else if (lvalue & clk_packed)
- error ("cannot bind packed field %qE to %qT",
- expr, ref_type);
- else
- error ("cannot bind rvalue %qE to %qT", expr, ref_type);
- }
+ /* If the reference is volatile or non-const, we
+ cannot create a temporary. */
+ if (lvalue & clk_bitfield)
+ error ("cannot bind bitfield %qE to %qT",
+ expr, ref_type);
+ else if (lvalue & clk_packed)
+ error ("cannot bind packed field %qE to %qT",
+ expr, ref_type);
+ else
+ error ("cannot bind rvalue %qE to %qT", expr, ref_type);
return error_mark_node;
}
/* If the source is a packed field, and we must use a copy
&& CLASS_TYPE_P (type)
&& type_has_nontrivial_copy_init (type))
{
- if (complain & tf_error)
- error ("cannot bind packed field %qE to %qT",
- expr, ref_type);
+ error ("cannot bind packed field %qE to %qT",
+ expr, ref_type);
return error_mark_node;
}
if (lvalue & clk_bitfield)
{
/* Build up a real lvalue-to-rvalue conversion in case the
copy constructor is trivial but not callable. */
- if (CLASS_TYPE_P (arg_type))
+ if (!cp_unevaluated_operand && CLASS_TYPE_P (arg_type))
force_rvalue (arg, tf_warning_or_error);
/* [expr.call] 5.2.2/7:
we must not perform access checks here. */
push_deferring_access_checks (dk_no_check);
+ /* We must make a copy of ARG, in case subsequent processing
+ alters any part of it. */
arg = break_out_target_exprs (arg);
if (TREE_CODE (arg) == CONSTRUCTOR)
{
}
else
{
- /* We must make a copy of ARG, in case subsequent processing
- alters any part of it. For example, during gimplification a
- cast of the form (T) &X::f (where "f" is a member function)
- will lead to replacing the PTRMEM_CST for &X::f with a
- VAR_DECL. We can avoid the copy for constants, since they
- are never modified in place. */
- if (!CONSTANT_CLASS_P (arg))
- arg = unshare_expr (arg);
arg = convert_for_initialization (0, type, arg, LOOKUP_IMPLICIT,
ICR_DEFAULT_ARGUMENT, fn, parmnum,
tf_warning_or_error);
converted_arg = build_base_path (PLUS_EXPR,
arg,
cand->conversion_path,
- 1);
+ 1, complain);
/* Check that the base class is accessible. */
if (!accessible_base_p (TREE_TYPE (argtype),
BINFO_TYPE (cand->conversion_path), true))
base_binfo = lookup_base (TREE_TYPE (TREE_TYPE (converted_arg)),
TREE_TYPE (parmtype), ba_unique, NULL);
converted_arg = build_base_path (PLUS_EXPR, converted_arg,
- base_binfo, 1);
+ base_binfo, 1, complain);
argarray[j++] = converted_arg;
parm = TREE_CHAIN (parm);
}
else
{
- /* We must only copy the non-tail padding parts.
- Use __builtin_memcpy for the bitwise copy. */
- tree arg0, arg1, arg2, t;
+ /* We must only copy the non-tail padding parts. */
+ tree arg0, arg2, t;
+ tree array_type, alias_set;
arg2 = TYPE_SIZE_UNIT (as_base);
- arg1 = arg;
arg0 = cp_build_addr_expr (to, complain);
- t = implicit_built_in_decls[BUILT_IN_MEMCPY];
- t = build_call_n (t, 3, arg0, arg1, arg2);
-
- t = convert (TREE_TYPE (arg0), t);
- val = cp_build_indirect_ref (t, RO_NULL, complain);
+ array_type = build_array_type (char_type_node,
+ build_index_type
+ (size_binop (MINUS_EXPR,
+ arg2, size_int (1))));
+ alias_set = build_int_cst (build_pointer_type (type), 0);
+ t = build2 (MODIFY_EXPR, void_type_node,
+ build2 (MEM_REF, array_type, arg0, alias_set),
+ build2 (MEM_REF, array_type, arg, alias_set));
+ val = build2 (COMPOUND_EXPR, TREE_TYPE (to), t, to);
TREE_NO_WARNING (val) = 1;
}
if (TREE_DEPRECATED (fn))
warn_deprecated_use (fn, NULL_TREE);
- argarray[0] = build_base_path (PLUS_EXPR, argarray[0], binfo, 1);
+ argarray[0] = build_base_path (PLUS_EXPR, argarray[0], binfo, 1,
+ complain);
if (TREE_SIDE_EFFECTS (argarray[0]))
argarray[0] = save_expr (argarray[0]);
t = build_pointer_type (TREE_TYPE (fn));
fn = build_call_a (fn, nargs, argarray);
SET_EXPR_LOCATION (fn, loc);
- /* If this call might throw an exception, note that fact. */
fndecl = get_callee_fndecl (fn);
/* Check that arguments to builtin functions match the expectations. */
/* However, for assignment operators, we must convert
dynamically if the base is virtual. */
instance = build_base_path (PLUS_EXPR, instance,
- binfo, /*nonnull=*/1);
+ binfo, /*nonnull=*/1, complain);
}
}
}
else
{
+ /* Optimize away vtable lookup if we know that this function
+ can't be overridden. */
if (DECL_VINDEX (fn) && ! (flags & LOOKUP_NONVIRTUAL)
- && resolves_to_fixed_type_p (instance, 0))
+ && (resolves_to_fixed_type_p (instance, 0)
+ || DECL_FINAL_P (fn) || CLASSTYPE_FINAL (basetype)))
flags |= LOOKUP_NONVIRTUAL;
if (explicit_targs)
flags |= LOOKUP_EXPLICIT_TMPL_ARGS;
types to which the references refer are the same type except for
top-level cv-qualifiers, and the type to which the reference
initialized by S2 refers is more cv-qualified than the type to
- which the reference initialized by S1 refers */
+ which the reference initialized by S1 refers.
+
+ DR 1328 [over.match.best]: the context is an initialization by
+ conversion function for direct reference binding (13.3.1.6) of a
+ reference to function type, the return type of F1 is the same kind of
+ reference (i.e. lvalue or rvalue) as the reference being initialized,
+ and the return type of F2 is not. */
if (ref_conv1 && ref_conv2)
{
if (!ref_conv1->this_p && !ref_conv2->this_p
- && (TYPE_REF_IS_RVALUE (ref_conv1->type)
- != TYPE_REF_IS_RVALUE (ref_conv2->type)))
+ && (ref_conv1->rvaluedness_matches_p
+ != ref_conv2->rvaluedness_matches_p)
+ && (same_type_p (ref_conv1->type, ref_conv2->type)
+ || (TYPE_REF_IS_RVALUE (ref_conv1->type)
+ != TYPE_REF_IS_RVALUE (ref_conv2->type))))
{
- if (ref_conv1->rvaluedness_matches_p)
- return 1;
- if (ref_conv2->rvaluedness_matches_p)
- return -1;
+ return (ref_conv1->rvaluedness_matches_p
+ - ref_conv2->rvaluedness_matches_p);
}
if (same_type_ignoring_top_level_qualifiers_p (to_type1, to_type2))
tree
initialize_reference (tree type, tree expr, tree decl, tree *cleanup,
- tsubst_flags_t complain)
+ int flags, tsubst_flags_t complain)
{
conversion *conv;
void *p;
p = conversion_obstack_alloc (0);
conv = reference_binding (type, TREE_TYPE (expr), expr, /*c_cast_p=*/false,
- LOOKUP_NORMAL);
+ flags);
if (!conv || conv->bad_p)
{
if (complain & tf_error)
{
- if (!CP_TYPE_CONST_P (TREE_TYPE (type))
- && !TYPE_REF_IS_RVALUE (type)
- && !real_lvalue_p (expr))
+ if (conv)
+ convert_like (conv, expr, complain);
+ else if (!CP_TYPE_CONST_P (TREE_TYPE (type))
+ && !TYPE_REF_IS_RVALUE (type)
+ && !real_lvalue_p (expr))
error ("invalid initialization of non-const reference of "
"type %qT from an rvalue of type %qT",
type, TREE_TYPE (expr));
(build_pointer_type (base_conv_type), expr,
complain));
expr = build_nop (type, expr);
- if (DECL_DECLARED_CONSTEXPR_P (decl))
- {
- expr = cxx_constant_value (expr);
- DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
- = reduced_constant_expression_p (expr);
- }
}
}
else
OSDN Git Service
