tree
convert_to_void (tree expr, const char *implicit, tsubst_flags_t complain)
{
if (expr == error_mark_node
|| TREE_TYPE (expr) == error_mark_node)
return error_mark_node;
if (!TREE_TYPE (expr))
return expr;
if (invalid_nonstatic_memfn_p (expr, complain))
return error_mark_node;
if (TREE_CODE (expr) == PSEUDO_DTOR_EXPR)
{
if (complain & tf_error)
error ("pseudo-destructor is not called");
return error_mark_node;
}
if (VOID_TYPE_P (TREE_TYPE (expr)))
return expr;
switch (TREE_CODE (expr))
{
case COND_EXPR:
{
/* The two parts of a cond expr might be separate lvalues. */
tree op1 = TREE_OPERAND (expr,1);
tree op2 = TREE_OPERAND (expr,2);
tree new_op1 = convert_to_void
(op1, (implicit && !TREE_SIDE_EFFECTS (op2)
? "second operand of conditional" : NULL), complain);
tree new_op2 = convert_to_void
(op2, (implicit && !TREE_SIDE_EFFECTS (op1)
? "third operand of conditional" : NULL), complain);
expr = build3 (COND_EXPR, TREE_TYPE (new_op1),
TREE_OPERAND (expr, 0), new_op1, new_op2);
break;
}
case COMPOUND_EXPR:
{
/* The second part of a compound expr contains the value. */
tree op1 = TREE_OPERAND (expr,1);
tree new_op1 = convert_to_void
(op1, (implicit && !TREE_NO_WARNING (expr)
? "right-hand operand of comma" : NULL), complain);
if (new_op1 != op1)
{
tree t = build2 (COMPOUND_EXPR, TREE_TYPE (new_op1),
TREE_OPERAND (expr, 0), new_op1);
expr = t;
}
break;
}
case NON_LVALUE_EXPR:
case NOP_EXPR:
/* These have already decayed to rvalue. */
break;
case CALL_EXPR: /* We have a special meaning for volatile void fn(). */
break;
case INDIRECT_REF:
{
tree type = TREE_TYPE (expr);
int is_reference = TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0)))
== REFERENCE_TYPE;
int is_volatile = TYPE_VOLATILE (type);
int is_complete = COMPLETE_TYPE_P (complete_type (type));
/* Can't load the value if we don't know the type. */
if (is_volatile && !is_complete)
{
if (complain & tf_warning)
warning (0, "object of incomplete type %qT will not be accessed in %s",
type, implicit ? implicit : "void context");
}
/* Don't load the value if this is an implicit dereference, or if
the type needs to be handled by ctors/dtors. */
else if (is_volatile && (is_reference || TREE_ADDRESSABLE (type)))
{
if (complain & tf_warning)
warning (0, "object of type %qT will not be accessed in %s",
TREE_TYPE (TREE_OPERAND (expr, 0)),
implicit ? implicit : "void context");
}
if (is_reference || !is_volatile || !is_complete || TREE_ADDRESSABLE (type))
expr = TREE_OPERAND (expr, 0);
break;
}
case VAR_DECL:
{
/* External variables might be incomplete. */
tree type = TREE_TYPE (expr);
int is_complete = COMPLETE_TYPE_P (complete_type (type));
if (TYPE_VOLATILE (type) && !is_complete && (complain & tf_warning))
warning (0, "object %qE of incomplete type %qT will not be accessed in %s",
expr, type, implicit ? implicit : "void context");
break;
}
case TARGET_EXPR:
/* Don't bother with the temporary object returned from a function if
we don't use it and don't need to destroy it. We'll still
allocate space for it in expand_call or declare_return_variable,
but we don't need to track it through all the tree phases. */
if (TARGET_EXPR_IMPLICIT_P (expr)
&& TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (expr)))
{
tree init = TARGET_EXPR_INITIAL (expr);
if (TREE_CODE (init) == AGGR_INIT_EXPR
&& !AGGR_INIT_VIA_CTOR_P (init))
{
tree fn = AGGR_INIT_EXPR_FN (init);
expr = build_call_array (TREE_TYPE (TREE_TYPE (TREE_TYPE (fn))),
fn,
aggr_init_expr_nargs (init),
AGGR_INIT_EXPR_ARGP (init));
}
}
break;
default:;
}
{
tree probe = expr;
if (TREE_CODE (probe) == ADDR_EXPR)
probe = TREE_OPERAND (expr, 0);
if (type_unknown_p (probe))
{
/* [over.over] enumerates the places where we can take the address
of an overloaded function, and this is not one of them. */
if (complain & tf_error)
error ("%s cannot resolve address of overloaded function",
implicit ? implicit : "void cast");
else
return error_mark_node;
expr = void_zero_node;
}
else if (implicit && probe == expr && is_overloaded_fn (probe))
{
/* Only warn when there is no &. */
if (complain & tf_warning)
warning (OPT_Waddress, "%s is a reference, not call, to function %qE",
implicit, expr);
if (TREE_CODE (expr) == COMPONENT_REF)
expr = TREE_OPERAND (expr, 0);
}
}
if (expr != error_mark_node && !VOID_TYPE_P (TREE_TYPE (expr)))
{
if (implicit
&& warn_unused_value
&& !TREE_NO_WARNING (expr)
&& !processing_template_decl)
{
/* The middle end does not warn about expressions that have
been explicitly cast to void, so we must do so here. */
if (!TREE_SIDE_EFFECTS (expr)) {
if (complain & tf_warning)
warning (OPT_Wunused_value, "%s has no effect", implicit);
}
else
{
tree e;
enum tree_code code;
enum tree_code_class tclass;
e = expr;
/* We might like to warn about (say) "(int) f()", as the
cast has no effect, but the compiler itself will
generate implicit conversions under some
circumstances. (For example a block copy will be
turned into a call to "__builtin_memcpy", with a
conversion of the return value to an appropriate
type.) So, to avoid false positives, we strip
conversions. Do not use STRIP_NOPs because it will
not strip conversions to "void", as that is not a
mode-preserving conversion. */
while (TREE_CODE (e) == NOP_EXPR)
e = TREE_OPERAND (e, 0);
code = TREE_CODE (e);
tclass = TREE_CODE_CLASS (code);
if ((tclass == tcc_comparison
|| tclass == tcc_unary
|| (tclass == tcc_binary
&& !(code == MODIFY_EXPR
|| code == INIT_EXPR
|| code == PREDECREMENT_EXPR
|| code == PREINCREMENT_EXPR
|| code == POSTDECREMENT_EXPR
|| code == POSTINCREMENT_EXPR)))
&& (complain & tf_warning))
warning (OPT_Wunused_value, "value computed is not used");
}
}
expr = build1 (CONVERT_EXPR, void_type_node, expr);
}
if (! TREE_SIDE_EFFECTS (expr))
expr = void_zero_node;
return expr;
}
tree
add_capture (tree lambda, tree id, tree orig_init, bool by_reference_p,
bool explicit_init_p)
{
char *buf;
tree type, member, name;
bool vla = false;
bool variadic = false;
tree initializer = orig_init;
if (PACK_EXPANSION_P (initializer))
{
initializer = PACK_EXPANSION_PATTERN (initializer);
variadic = true;
}
if (TREE_CODE (initializer) == TREE_LIST)
initializer = build_x_compound_expr_from_list (initializer, ELK_INIT,
tf_warning_or_error);
type = TREE_TYPE (initializer);
if (type == error_mark_node)
return error_mark_node;
if (array_of_runtime_bound_p (type))
{
vla = true;
if (!by_reference_p)
error ("array of runtime bound cannot be captured by copy, "
"only by reference");
/* For a VLA, we capture the address of the first element and the
maximum index, and then reconstruct the VLA for the proxy. */
tree elt = cp_build_array_ref (input_location, initializer,
integer_zero_node, tf_warning_or_error);
initializer = build_constructor_va (init_list_type_node, 2,
NULL_TREE, build_address (elt),
NULL_TREE, array_type_nelts (type));
type = vla_capture_type (type);
}
else if (!dependent_type_p (type)
&& variably_modified_type_p (type, NULL_TREE))
{
error ("capture of variable-size type %qT that is not an N3639 array "
"of runtime bound", type);
if (TREE_CODE (type) == ARRAY_TYPE
&& variably_modified_type_p (TREE_TYPE (type), NULL_TREE))
inform (input_location, "because the array element type %qT has "
"variable size", TREE_TYPE (type));
type = error_mark_node;
}
else
{
type = lambda_capture_field_type (initializer, explicit_init_p);
if (by_reference_p)
{
type = build_reference_type (type);
if (!dependent_type_p (type) && !real_lvalue_p (initializer))
error ("cannot capture %qE by reference", initializer);
}
else
{
/* Capture by copy requires a complete type. */
type = complete_type (type);
if (!dependent_type_p (type) && !COMPLETE_TYPE_P (type))
{
error ("capture by copy of incomplete type %qT", type);
cxx_incomplete_type_inform (type);
return error_mark_node;
}
}
}
/* Add __ to the beginning of the field name so that user code
won't find the field with name lookup. We can't just leave the name
unset because template instantiation uses the name to find
instantiated fields. */
buf = (char *) alloca (IDENTIFIER_LENGTH (id) + 3);
buf[1] = buf[0] = '_';
memcpy (buf + 2, IDENTIFIER_POINTER (id),
IDENTIFIER_LENGTH (id) + 1);
name = get_identifier (buf);
/* If TREE_TYPE isn't set, we're still in the introducer, so check
for duplicates. */
if (!LAMBDA_EXPR_CLOSURE (lambda))
{
if (IDENTIFIER_MARKED (name))
{
pedwarn (input_location, 0,
"already captured %qD in lambda expression", id);
return NULL_TREE;
}
IDENTIFIER_MARKED (name) = true;
}
if (variadic)
type = make_pack_expansion (type);
/* Make member variable. */
member = build_decl (input_location, FIELD_DECL, name, type);
DECL_VLA_CAPTURE_P (member) = vla;
if (!explicit_init_p)
/* Normal captures are invisible to name lookup but uses are replaced
with references to the capture field; we implement this by only
really making them invisible in unevaluated context; see
qualify_lookup. For now, let's make explicitly initialized captures
always visible. */
DECL_NORMAL_CAPTURE_P (member) = true;
if (id == this_identifier)
LAMBDA_EXPR_THIS_CAPTURE (lambda) = member;
/* Add it to the appropriate closure class if we've started it. */
if (current_class_type
&& current_class_type == LAMBDA_EXPR_CLOSURE (lambda))
finish_member_declaration (member);
tree listmem = member;
if (variadic)
{
listmem = make_pack_expansion (member);
initializer = orig_init;
}
LAMBDA_EXPR_CAPTURE_LIST (lambda)
= tree_cons (listmem, initializer, LAMBDA_EXPR_CAPTURE_LIST (lambda));
if (LAMBDA_EXPR_CLOSURE (lambda))
return build_capture_proxy (member);
/* For explicit captures we haven't started the function yet, so we wait
and build the proxy from cp_parser_lambda_body. */
return NULL_TREE;
}
tree
ocp_convert (tree type, tree expr, int convtype, int flags)
{
tree e = expr;
enum tree_code code = TREE_CODE (type);
const char *invalid_conv_diag;
if (error_operand_p (e) || type == error_mark_node)
return error_mark_node;
complete_type (type);
complete_type (TREE_TYPE (expr));
if ((invalid_conv_diag
= targetm.invalid_conversion (TREE_TYPE (expr), type)))
{
error (invalid_conv_diag);
return error_mark_node;
}
e = integral_constant_value (e);
if (MAYBE_CLASS_TYPE_P (type) && (convtype & CONV_FORCE_TEMP))
/* We need a new temporary; don't take this shortcut. */;
else if (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (e)))
{
if (same_type_p (type, TREE_TYPE (e)))
/* The call to fold will not always remove the NOP_EXPR as
might be expected, since if one of the types is a typedef;
the comparison in fold is just equality of pointers, not a
call to comptypes. We don't call fold in this case because
that can result in infinite recursion; fold will call
convert, which will call ocp_convert, etc. */
return e;
/* For complex data types, we need to perform componentwise
conversion. */
else if (TREE_CODE (type) == COMPLEX_TYPE)
return fold_if_not_in_template (convert_to_complex (type, e));
else if (TREE_CODE (e) == TARGET_EXPR)
{
/* Don't build a NOP_EXPR of class type. Instead, change the
type of the temporary. */
TREE_TYPE (e) = TREE_TYPE (TARGET_EXPR_SLOT (e)) = type;
return e;
}
else
{
/* We shouldn't be treating objects of ADDRESSABLE type as
rvalues. */
gcc_assert (!TREE_ADDRESSABLE (type));
return fold_if_not_in_template (build_nop (type, e));
}
}
if (code == VOID_TYPE && (convtype & CONV_STATIC))
{
e = convert_to_void (e, /*implicit=*/NULL, tf_warning_or_error);
return e;
}
if (INTEGRAL_CODE_P (code))
{
tree intype = TREE_TYPE (e);
if (TREE_CODE (type) == ENUMERAL_TYPE)
{
/* enum = enum, enum = int, enum = float, (enum)pointer are all
errors. */
if (((INTEGRAL_OR_ENUMERATION_TYPE_P (intype)
|| TREE_CODE (intype) == REAL_TYPE)
&& ! (convtype & CONV_STATIC))
|| TREE_CODE (intype) == POINTER_TYPE)
{
if (flags & LOOKUP_COMPLAIN)
permerror (input_location, "conversion from %q#T to %q#T", intype, type);
if (!flag_permissive)
return error_mark_node;
}
/* [expr.static.cast]
8. A value of integral or enumeration type can be explicitly
converted to an enumeration type. The value is unchanged if
the original value is within the range of the enumeration
values. Otherwise, the resulting enumeration value is
unspecified. */
if (TREE_CODE (expr) == INTEGER_CST && !int_fits_type_p (expr, type))
warning (OPT_Wconversion,
"the result of the conversion is unspecified because "
"%qE is outside the range of type %qT",
expr, type);
}
if (MAYBE_CLASS_TYPE_P (intype))
{
tree rval;
rval = build_type_conversion (type, e);
if (rval)
return rval;
if (flags & LOOKUP_COMPLAIN)
error ("%q#T used where a %qT was expected", intype, type);
return error_mark_node;
}
if (code == BOOLEAN_TYPE)
return cp_truthvalue_conversion (e);
return fold_if_not_in_template (convert_to_integer (type, e));
}
if (POINTER_TYPE_P (type) || TYPE_PTR_TO_MEMBER_P (type))
return fold_if_not_in_template (cp_convert_to_pointer (type, e));
if (code == VECTOR_TYPE)
{
tree in_vtype = TREE_TYPE (e);
if (MAYBE_CLASS_TYPE_P (in_vtype))
{
tree ret_val;
ret_val = build_type_conversion (type, e);
if (ret_val)
return ret_val;
if (flags & LOOKUP_COMPLAIN)
error ("%q#T used where a %qT was expected", in_vtype, type);
return error_mark_node;
}
return fold_if_not_in_template (convert_to_vector (type, e));
}
if (code == REAL_TYPE || code == COMPLEX_TYPE)
{
if (MAYBE_CLASS_TYPE_P (TREE_TYPE (e)))
{
tree rval;
rval = build_type_conversion (type, e);
if (rval)
return rval;
else
if (flags & LOOKUP_COMPLAIN)
error ("%q#T used where a floating point value was expected",
TREE_TYPE (e));
}
if (code == REAL_TYPE)
return fold_if_not_in_template (convert_to_real (type, e));
else if (code == COMPLEX_TYPE)
return fold_if_not_in_template (convert_to_complex (type, e));
}
/* New C++ semantics: since assignment is now based on
memberwise copying, if the rhs type is derived from the
lhs type, then we may still do a conversion. */
if (RECORD_OR_UNION_CODE_P (code))
{
tree dtype = TREE_TYPE (e);
tree ctor = NULL_TREE;
dtype = TYPE_MAIN_VARIANT (dtype);
/* Conversion between aggregate types. New C++ semantics allow
objects of derived type to be cast to objects of base type.
Old semantics only allowed this between pointers.
There may be some ambiguity between using a constructor
vs. using a type conversion operator when both apply. */
ctor = e;
if (abstract_virtuals_error (NULL_TREE, type))
return error_mark_node;
if (BRACE_ENCLOSED_INITIALIZER_P (ctor))
ctor = perform_implicit_conversion (type, ctor, tf_warning_or_error);
else if ((flags & LOOKUP_ONLYCONVERTING)
&& ! (CLASS_TYPE_P (dtype) && DERIVED_FROM_P (type, dtype)))
/* For copy-initialization, first we create a temp of the proper type
with a user-defined conversion sequence, then we direct-initialize
the target with the temp (see [dcl.init]). */
ctor = build_user_type_conversion (type, ctor, flags);
else
ctor = build_special_member_call (NULL_TREE,
complete_ctor_identifier,
build_tree_list (NULL_TREE, ctor),
type, flags,
tf_warning_or_error);
if (ctor)
return build_cplus_new (type, ctor);
}
if (flags & LOOKUP_COMPLAIN)
error ("conversion from %qT to non-scalar type %qT requested",
TREE_TYPE (expr), type);
return error_mark_node;
}
static tree
cp_convert_to_pointer (tree type, tree expr)
{
tree intype = TREE_TYPE (expr);
enum tree_code form;
tree rval;
if (intype == error_mark_node)
return error_mark_node;
if (MAYBE_CLASS_TYPE_P (intype))
{
intype = complete_type (intype);
if (!COMPLETE_TYPE_P (intype))
{
error ("can't convert from incomplete type %qT to %qT",
intype, type);
return error_mark_node;
}
rval = build_type_conversion (type, expr);
if (rval)
{
if (rval == error_mark_node)
error ("conversion of %qE from %qT to %qT is ambiguous",
expr, intype, type);
return rval;
}
}
/* Handle anachronistic conversions from (::*)() to cv void* or (*)(). */
if (TREE_CODE (type) == POINTER_TYPE
&& (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE
|| VOID_TYPE_P (TREE_TYPE (type))))
{
if (TYPE_PTRMEMFUNC_P (intype)
|| TREE_CODE (intype) == METHOD_TYPE)
return convert_member_func_to_ptr (type, expr);
if (TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE)
return build_nop (type, expr);
intype = TREE_TYPE (expr);
}
if (expr == error_mark_node)
return error_mark_node;
form = TREE_CODE (intype);
if (POINTER_TYPE_P (intype))
{
intype = TYPE_MAIN_VARIANT (intype);
if (TYPE_MAIN_VARIANT (type) != intype
&& TREE_CODE (type) == POINTER_TYPE
&& TREE_CODE (TREE_TYPE (type)) == RECORD_TYPE
&& MAYBE_CLASS_TYPE_P (TREE_TYPE (type))
&& MAYBE_CLASS_TYPE_P (TREE_TYPE (intype))
&& TREE_CODE (TREE_TYPE (intype)) == RECORD_TYPE)
{
enum tree_code code = PLUS_EXPR;
tree binfo;
tree intype_class;
tree type_class;
bool same_p;
intype_class = TREE_TYPE (intype);
type_class = TREE_TYPE (type);
same_p = same_type_p (TYPE_MAIN_VARIANT (intype_class),
TYPE_MAIN_VARIANT (type_class));
binfo = NULL_TREE;
/* Try derived to base conversion. */
if (!same_p)
binfo = lookup_base (intype_class, type_class, ba_check, NULL);
if (!same_p && !binfo)
{
/* Try base to derived conversion. */
binfo = lookup_base (type_class, intype_class, ba_check, NULL);
code = MINUS_EXPR;
}
if (binfo == error_mark_node)
return error_mark_node;
if (binfo || same_p)
{
if (binfo)
expr = build_base_path (code, expr, binfo, 0);
/* Add any qualifier conversions. */
return build_nop (type, expr);
}
}
if (TYPE_PTRMEMFUNC_P (type))
{
error ("cannot convert %qE from type %qT to type %qT",
expr, intype, type);
return error_mark_node;
}
return build_nop (type, expr);
}
else if ((TYPE_PTRMEM_P (type) && TYPE_PTRMEM_P (intype))
|| (TYPE_PTRMEMFUNC_P (type) && TYPE_PTRMEMFUNC_P (intype)))
return convert_ptrmem (type, expr, /*allow_inverse_p=*/false,
/*c_cast_p=*/false);
else if (TYPE_PTRMEMFUNC_P (intype))
{
if (!warn_pmf2ptr)
{
if (TREE_CODE (expr) == PTRMEM_CST)
return cp_convert_to_pointer (type,
PTRMEM_CST_MEMBER (expr));
else if (TREE_CODE (expr) == OFFSET_REF)
{
tree object = TREE_OPERAND (expr, 0);
return get_member_function_from_ptrfunc (&object,
TREE_OPERAND (expr, 1));
}
}
error ("cannot convert %qE from type %qT to type %qT",
expr, intype, type);
return error_mark_node;
}
if (integer_zerop (expr))
{
if (TYPE_PTRMEMFUNC_P (type))
return build_ptrmemfunc (TYPE_PTRMEMFUNC_FN_TYPE (type), expr, 0,
/*c_cast_p=*/false);
if (TYPE_PTRMEM_P (type))
{
/* A NULL pointer-to-member is represented by -1, not by
zero. */
expr = build_int_cst_type (type, -1);
}
else
expr = build_int_cst (type, 0);
return expr;
}
else if (TYPE_PTR_TO_MEMBER_P (type) && INTEGRAL_CODE_P (form))
{
error ("invalid conversion from %qT to %qT", intype, type);
return error_mark_node;
}
if (INTEGRAL_CODE_P (form))
{
if (TYPE_PRECISION (intype) == POINTER_SIZE)
return build1 (CONVERT_EXPR, type, expr);
expr = cp_convert (c_common_type_for_size (POINTER_SIZE, 0), expr);
/* Modes may be different but sizes should be the same. There
is supposed to be some integral type that is the same width
as a pointer. */
gcc_assert (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (expr)))
== GET_MODE_SIZE (TYPE_MODE (type)));
return convert_to_pointer (type, expr);
}
if (type_unknown_p (expr))
return instantiate_type (type, expr, tf_warning_or_error);
error ("cannot convert %qE from type %qT to type %qT",
expr, intype, type);
return error_mark_node;
}
static tree
build_dynamic_cast_1 (tree type, tree expr)
{
enum tree_code tc = TREE_CODE (type);
tree exprtype = TREE_TYPE (expr);
tree dcast_fn;
tree old_expr = expr;
const char *errstr = NULL;
/* T shall be a pointer or reference to a complete class type, or
`pointer to cv void''. */
switch (tc)
{
case POINTER_TYPE:
if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
break;
/* Fall through. */
case REFERENCE_TYPE:
if (! IS_AGGR_TYPE (TREE_TYPE (type)))
{
errstr = "target is not pointer or reference to class";
goto fail;
}
if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
{
errstr = "target is not pointer or reference to complete type";
goto fail;
}
break;
default:
errstr = "target is not pointer or reference";
goto fail;
}
if (tc == POINTER_TYPE)
{
/* If T is a pointer type, v shall be an rvalue of a pointer to
complete class type, and the result is an rvalue of type T. */
if (TREE_CODE (exprtype) != POINTER_TYPE)
{
errstr = "source is not a pointer";
goto fail;
}
if (! IS_AGGR_TYPE (TREE_TYPE (exprtype)))
{
errstr = "source is not a pointer to class";
goto fail;
}
if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (exprtype))))
{
errstr = "source is a pointer to incomplete type";
goto fail;
}
}
else
{
/* Apply trivial conversion T -> T& for dereferenced ptrs. */
exprtype = build_reference_type (exprtype);
expr = convert_to_reference (exprtype, expr, CONV_IMPLICIT,
LOOKUP_NORMAL, NULL_TREE);
/* T is a reference type, v shall be an lvalue of a complete class
type, and the result is an lvalue of the type referred to by T. */
if (! IS_AGGR_TYPE (TREE_TYPE (exprtype)))
{
errstr = "source is not of class type";
goto fail;
}
if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (exprtype))))
{
errstr = "source is of incomplete class type";
goto fail;
}
}
/* The dynamic_cast operator shall not cast away constness. */
if (!at_least_as_qualified_p (TREE_TYPE (type),
TREE_TYPE (exprtype)))
{
errstr = "conversion casts away constness";
goto fail;
}
/* If *type is an unambiguous accessible base class of *exprtype,
convert statically. */
{
tree binfo;
binfo = lookup_base (TREE_TYPE (exprtype), TREE_TYPE (type),
ba_check, NULL);
if (binfo)
{
expr = build_base_path (PLUS_EXPR, convert_from_reference (expr),
binfo, 0);
if (TREE_CODE (exprtype) == POINTER_TYPE)
expr = non_lvalue (expr);
return expr;
}
}
/* Otherwise *exprtype must be a polymorphic class (have a vtbl). */
if (TYPE_POLYMORPHIC_P (TREE_TYPE (exprtype)))
{
tree expr1;
/* if TYPE is `void *', return pointer to complete object. */
if (tc == POINTER_TYPE && VOID_TYPE_P (TREE_TYPE (type)))
{
/* if b is an object, dynamic_cast<void *>(&b) == (void *)&b. */
if (TREE_CODE (expr) == ADDR_EXPR
&& TREE_CODE (TREE_OPERAND (expr, 0)) == VAR_DECL
&& TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == RECORD_TYPE)
return build1 (NOP_EXPR, type, expr);
/* Since expr is used twice below, save it. */
expr = save_expr (expr);
expr1 = build_headof (expr);
if (TREE_TYPE (expr1) != type)
expr1 = build1 (NOP_EXPR, type, expr1);
return ifnonnull (expr, expr1);
}
else
{
tree retval;
tree result, td2, td3, elems;
tree static_type, target_type, boff;
/* If we got here, we can't convert statically. Therefore,
dynamic_cast<D&>(b) (b an object) cannot succeed. */
if (tc == REFERENCE_TYPE)
{
if (TREE_CODE (old_expr) == VAR_DECL
&& TREE_CODE (TREE_TYPE (old_expr)) == RECORD_TYPE)
{
tree expr = throw_bad_cast ();
warning ("dynamic_cast of %q#D to %q#T can never succeed",
old_expr, type);
/* Bash it to the expected type. */
TREE_TYPE (expr) = type;
return expr;
}
}
/* Ditto for dynamic_cast<D*>(&b). */
else if (TREE_CODE (expr) == ADDR_EXPR)
{
tree op = TREE_OPERAND (expr, 0);
if (TREE_CODE (op) == VAR_DECL
&& TREE_CODE (TREE_TYPE (op)) == RECORD_TYPE)
{
warning ("dynamic_cast of %q#D to %q#T can never succeed",
op, type);
retval = build_int_cst (type, 0);
return retval;
}
}
target_type = TYPE_MAIN_VARIANT (TREE_TYPE (type));
static_type = TYPE_MAIN_VARIANT (TREE_TYPE (exprtype));
td2 = get_tinfo_decl (target_type);
mark_used (td2);
td2 = build_unary_op (ADDR_EXPR, td2, 0);
td3 = get_tinfo_decl (static_type);
mark_used (td3);
td3 = build_unary_op (ADDR_EXPR, td3, 0);
/* Determine how T and V are related. */
boff = dcast_base_hint (static_type, target_type);
/* Since expr is used twice below, save it. */
expr = save_expr (expr);
expr1 = expr;
if (tc == REFERENCE_TYPE)
expr1 = build_unary_op (ADDR_EXPR, expr1, 0);
elems = tree_cons
(NULL_TREE, expr1, tree_cons
(NULL_TREE, td3, tree_cons
(NULL_TREE, td2, tree_cons
(NULL_TREE, boff, NULL_TREE))));
dcast_fn = dynamic_cast_node;
if (!dcast_fn)
{
tree tmp;
tree tinfo_ptr;
tree ns = abi_node;
const char *name;
push_nested_namespace (ns);
tinfo_ptr = xref_tag (class_type,
get_identifier ("__class_type_info"),
/* APPLE LOCAL 4184203 */
/*tag_scope=*/ts_global, false);
tinfo_ptr = build_pointer_type
(build_qualified_type
(tinfo_ptr, TYPE_QUAL_CONST));
name = "__dynamic_cast";
tmp = tree_cons
(NULL_TREE, const_ptr_type_node, tree_cons
(NULL_TREE, tinfo_ptr, tree_cons
(NULL_TREE, tinfo_ptr, tree_cons
(NULL_TREE, ptrdiff_type_node, void_list_node))));
tmp = build_function_type (ptr_type_node, tmp);
dcast_fn = build_library_fn_ptr (name, tmp);
DECL_IS_PURE (dcast_fn) = 1;
pop_nested_namespace (ns);
dynamic_cast_node = dcast_fn;
}
result = build_cxx_call (dcast_fn, elems);
if (tc == REFERENCE_TYPE)
{
tree bad = throw_bad_cast ();
result = save_expr (result);
return build3 (COND_EXPR, type, result, result, bad);
}
/* Now back to the type we want from a void*. */
result = cp_convert (type, result);
return ifnonnull (expr, result);
}
}
else
errstr = "source type is not polymorphic";
fail:
error ("cannot dynamic_cast %qE (of type %q#T) to type %q#T (%s)",
expr, exprtype, type, errstr);
return error_mark_node;
}
tree
convert_to_void (tree expr, const char *implicit)
{
if (expr == error_mark_node
|| TREE_TYPE (expr) == error_mark_node)
return error_mark_node;
if (!TREE_TYPE (expr))
return expr;
if (invalid_nonstatic_memfn_p (expr))
return error_mark_node;
if (TREE_CODE (expr) == PSEUDO_DTOR_EXPR)
{
error ("pseudo-destructor is not called");
return error_mark_node;
}
if (VOID_TYPE_P (TREE_TYPE (expr)))
return expr;
switch (TREE_CODE (expr))
{
case COND_EXPR:
{
/* The two parts of a cond expr might be separate lvalues. */
tree op1 = TREE_OPERAND (expr,1);
tree op2 = TREE_OPERAND (expr,2);
tree new_op1 = convert_to_void
(op1, (implicit && !TREE_SIDE_EFFECTS (op2)
? "second operand of conditional" : NULL));
tree new_op2 = convert_to_void
(op2, (implicit && !TREE_SIDE_EFFECTS (op1)
? "third operand of conditional" : NULL));
expr = build (COND_EXPR, TREE_TYPE (new_op1),
TREE_OPERAND (expr, 0), new_op1, new_op2);
break;
}
case COMPOUND_EXPR:
{
/* The second part of a compound expr contains the value. */
tree op1 = TREE_OPERAND (expr,1);
tree new_op1 = convert_to_void
(op1, (implicit && !TREE_NO_UNUSED_WARNING (expr)
? "right-hand operand of comma" : NULL));
if (new_op1 != op1)
{
tree t = build (COMPOUND_EXPR, TREE_TYPE (new_op1),
TREE_OPERAND (expr, 0), new_op1);
expr = t;
}
break;
}
case NON_LVALUE_EXPR:
case NOP_EXPR:
/* These have already decayed to rvalue. */
break;
case CALL_EXPR: /* We have a special meaning for volatile void fn(). */
break;
case INDIRECT_REF:
{
tree type = TREE_TYPE (expr);
int is_reference = TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0)))
== REFERENCE_TYPE;
int is_volatile = TYPE_VOLATILE (type);
int is_complete = COMPLETE_TYPE_P (complete_type (type));
if (is_volatile && !is_complete)
warning ("object of incomplete type `%T' will not be accessed in %s",
type, implicit ? implicit : "void context");
else if (is_reference && is_volatile)
warning ("object of type `%T' will not be accessed in %s",
TREE_TYPE (TREE_OPERAND (expr, 0)),
implicit ? implicit : "void context");
if (is_reference || !is_volatile || !is_complete)
expr = TREE_OPERAND (expr, 0);
break;
}
case VAR_DECL:
{
/* External variables might be incomplete. */
tree type = TREE_TYPE (expr);
int is_complete = COMPLETE_TYPE_P (complete_type (type));
if (TYPE_VOLATILE (type) && !is_complete)
warning ("object `%E' of incomplete type `%T' will not be accessed in %s",
expr, type, implicit ? implicit : "void context");
break;
}
default:;
}
{
tree probe = expr;
if (TREE_CODE (probe) == ADDR_EXPR)
probe = TREE_OPERAND (expr, 0);
if (type_unknown_p (probe))
{
/* [over.over] enumerates the places where we can take the address
of an overloaded function, and this is not one of them. */
pedwarn ("%s cannot resolve address of overloaded function",
implicit ? implicit : "void cast");
expr = void_zero_node;
}
else if (implicit && probe == expr && is_overloaded_fn (probe))
/* Only warn when there is no &. */
warning ("%s is a reference, not call, to function `%E'",
implicit, expr);
}
if (expr != error_mark_node && !VOID_TYPE_P (TREE_TYPE (expr)))
{
if (implicit && !TREE_SIDE_EFFECTS (expr) && warn_unused_value)
warning ("%s has no effect", implicit);
expr = build1 (CONVERT_EXPR, void_type_node, expr);
}
return expr;
}
static tree
cp_convert_to_pointer (tree type, tree expr, bool force)
{
tree intype = TREE_TYPE (expr);
enum tree_code form;
tree rval;
if (intype == error_mark_node)
return error_mark_node;
if (IS_AGGR_TYPE (intype))
{
intype = complete_type (intype);
if (!COMPLETE_TYPE_P (intype))
{
error ("can't convert from incomplete type `%T' to `%T'",
intype, type);
return error_mark_node;
}
rval = build_type_conversion (type, expr);
if (rval)
{
if (rval == error_mark_node)
error ("conversion of `%E' from `%T' to `%T' is ambiguous",
expr, intype, type);
return rval;
}
}
/* Handle anachronistic conversions from (::*)() to cv void* or (*)(). */
if (TREE_CODE (type) == POINTER_TYPE
&& (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE
|| VOID_TYPE_P (TREE_TYPE (type))))
{
/* Allow an implicit this pointer for pointer to member
functions. */
if (TYPE_PTRMEMFUNC_P (intype))
{
if (pedantic || warn_pmf2ptr)
pedwarn ("converting from `%T' to `%T'", intype, type);
if (TREE_CODE (expr) == PTRMEM_CST)
expr = build_address (PTRMEM_CST_MEMBER (expr));
else
{
tree decl = maybe_dummy_object (TYPE_PTRMEM_CLASS_TYPE (intype),
0);
decl = build_address (decl);
expr = get_member_function_from_ptrfunc (&decl, expr);
}
}
else if (TREE_CODE (TREE_TYPE (expr)) == METHOD_TYPE)
{
if (pedantic || warn_pmf2ptr)
pedwarn ("converting from `%T' to `%T'", intype, type);
expr = build_addr_func (expr);
}
if (TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE)
return build_nop (type, expr);
intype = TREE_TYPE (expr);
}
if (expr == error_mark_node)
return error_mark_node;
form = TREE_CODE (intype);
if (POINTER_TYPE_P (intype))
{
intype = TYPE_MAIN_VARIANT (intype);
if (TYPE_MAIN_VARIANT (type) != intype
&& TREE_CODE (type) == POINTER_TYPE
&& TREE_CODE (TREE_TYPE (type)) == RECORD_TYPE
&& IS_AGGR_TYPE (TREE_TYPE (type))
&& IS_AGGR_TYPE (TREE_TYPE (intype))
&& TREE_CODE (TREE_TYPE (intype)) == RECORD_TYPE)
{
enum tree_code code = PLUS_EXPR;
tree binfo;
tree intype_class;
tree type_class;
bool same_p;
intype_class = TREE_TYPE (intype);
type_class = TREE_TYPE (type);
same_p = same_type_p (TYPE_MAIN_VARIANT (intype_class),
TYPE_MAIN_VARIANT (type_class));
binfo = NULL_TREE;
/* Try derived to base conversion. */
if (!same_p)
binfo = lookup_base (intype_class, type_class, ba_check, NULL);
if (!same_p && !binfo)
{
/* Try base to derived conversion. */
binfo = lookup_base (type_class, intype_class, ba_check, NULL);
code = MINUS_EXPR;
}
if (binfo == error_mark_node)
return error_mark_node;
if (binfo || same_p)
{
if (binfo)
expr = build_base_path (code, expr, binfo, 0);
/* Add any qualifier conversions. */
return build_nop (type, expr);
}
}
if (TYPE_PTRMEMFUNC_P (type))
{
error ("cannot convert `%E' from type `%T' to type `%T'",
expr, intype, type);
return error_mark_node;
}
return build_nop (type, expr);
}
else if (TYPE_PTRMEM_P (type) && TYPE_PTRMEM_P (intype))
{
tree b1;
tree b2;
tree binfo;
enum tree_code code = PLUS_EXPR;
base_kind bk;
b1 = TYPE_PTRMEM_CLASS_TYPE (type);
b2 = TYPE_PTRMEM_CLASS_TYPE (intype);
binfo = lookup_base (b1, b2, ba_check, &bk);
if (!binfo)
{
binfo = lookup_base (b2, b1, ba_check, &bk);
code = MINUS_EXPR;
}
if (binfo == error_mark_node)
return error_mark_node;
if (bk == bk_via_virtual)
{
if (force)
warning ("pointer to member cast from `%T' to `%T' is via virtual base",
intype, type);
else
{
error ("pointer to member cast from `%T' to `%T' is via virtual base",
intype, type);
return error_mark_node;
}
/* This is a reinterpret cast, whose result is unspecified.
We choose to do nothing. */
return build1 (NOP_EXPR, type, expr);
}
if (TREE_CODE (expr) == PTRMEM_CST)
expr = cplus_expand_constant (expr);
if (binfo && !integer_zerop (BINFO_OFFSET (binfo)))
expr = size_binop (code,
build_nop (sizetype, expr),
BINFO_OFFSET (binfo));
return build_nop (type, expr);
}
else if (TYPE_PTRMEMFUNC_P (type) && TYPE_PTRMEMFUNC_P (intype))
return build_ptrmemfunc (TYPE_PTRMEMFUNC_FN_TYPE (type), expr, 0);
else if (TYPE_PTRMEMFUNC_P (intype))
{
if (!warn_pmf2ptr)
{
if (TREE_CODE (expr) == PTRMEM_CST)
return cp_convert_to_pointer (type,
PTRMEM_CST_MEMBER (expr),
force);
else if (TREE_CODE (expr) == OFFSET_REF)
{
tree object = TREE_OPERAND (expr, 0);
return get_member_function_from_ptrfunc (&object,
TREE_OPERAND (expr, 1));
}
}
error ("cannot convert `%E' from type `%T' to type `%T'",
expr, intype, type);
return error_mark_node;
}
if (integer_zerop (expr))
{
if (TYPE_PTRMEMFUNC_P (type))
return build_ptrmemfunc (TYPE_PTRMEMFUNC_FN_TYPE (type), expr, 0);
if (TYPE_PTRMEM_P (type))
/* A NULL pointer-to-member is represented by -1, not by
zero. */
expr = build_int_2 (-1, -1);
else
expr = build_int_2 (0, 0);
TREE_TYPE (expr) = type;
/* Fix up the representation of -1 if appropriate. */
force_fit_type (expr, 0);
return expr;
}
else if (TYPE_PTR_TO_MEMBER_P (type) && INTEGRAL_CODE_P (form))
{
error ("invalid conversion from '%T' to '%T'", intype, type);
return error_mark_node;
}
if (INTEGRAL_CODE_P (form))
{
if (TYPE_PRECISION (intype) == POINTER_SIZE)
return build1 (CONVERT_EXPR, type, expr);
expr = cp_convert (c_common_type_for_size (POINTER_SIZE, 0), expr);
/* Modes may be different but sizes should be the same. */
if (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (expr)))
!= GET_MODE_SIZE (TYPE_MODE (type)))
/* There is supposed to be some integral type
that is the same width as a pointer. */
abort ();
return convert_to_pointer (type, expr);
}
if (type_unknown_p (expr))
return instantiate_type (type, expr, tf_error | tf_warning);
error ("cannot convert `%E' from type `%T' to type `%T'",
expr, intype, type);
return error_mark_node;
}
tree
ocp_convert (tree type, tree expr, int convtype, int flags)
{
tree e = expr;
enum tree_code code = TREE_CODE (type);
if (error_operand_p (e) || type == error_mark_node)
return error_mark_node;
complete_type (type);
complete_type (TREE_TYPE (expr));
e = decl_constant_value (e);
if (IS_AGGR_TYPE (type) && (convtype & CONV_FORCE_TEMP)
/* Some internal structures (vtable_entry_type, sigtbl_ptr_type)
don't go through finish_struct, so they don't have the synthesized
constructors. So don't force a temporary. */
&& TYPE_HAS_CONSTRUCTOR (type))
/* We need a new temporary; don't take this shortcut. */;
else if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (e)))
{
if (same_type_p (type, TREE_TYPE (e)))
/* The call to fold will not always remove the NOP_EXPR as
might be expected, since if one of the types is a typedef;
the comparison in fold is just equality of pointers, not a
call to comptypes. We don't call fold in this case because
that can result in infinite recursion; fold will call
convert, which will call ocp_convert, etc. */
return e;
/* For complex data types, we need to perform componentwise
conversion. */
else if (TREE_CODE (type) == COMPLEX_TYPE)
return fold (convert_to_complex (type, e));
else if (TREE_CODE (e) == TARGET_EXPR)
{
/* Don't build a NOP_EXPR of class type. Instead, change the
type of the temporary. Only allow this for cv-qual changes,
though. */
if (!same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (e)),
TYPE_MAIN_VARIANT (type)))
abort ();
TREE_TYPE (e) = TREE_TYPE (TARGET_EXPR_SLOT (e)) = type;
return e;
}
else if (TREE_ADDRESSABLE (type))
/* We shouldn't be treating objects of ADDRESSABLE type as rvalues. */
abort ();
else
return fold (build1 (NOP_EXPR, type, e));
}
if (code == VOID_TYPE && (convtype & CONV_STATIC))
{
e = convert_to_void (e, /*implicit=*/NULL);
return e;
}
if (INTEGRAL_CODE_P (code))
{
tree intype = TREE_TYPE (e);
/* enum = enum, enum = int, enum = float, (enum)pointer are all
errors. */
if (TREE_CODE (type) == ENUMERAL_TYPE
&& ((ARITHMETIC_TYPE_P (intype) && ! (convtype & CONV_STATIC))
|| (TREE_CODE (intype) == POINTER_TYPE)))
{
pedwarn ("conversion from `%#T' to `%#T'", intype, type);
if (flag_pedantic_errors)
return error_mark_node;
}
if (IS_AGGR_TYPE (intype))
{
tree rval;
rval = build_type_conversion (type, e);
if (rval)
return rval;
if (flags & LOOKUP_COMPLAIN)
error ("`%#T' used where a `%T' was expected", intype, type);
if (flags & LOOKUP_SPECULATIVELY)
return NULL_TREE;
return error_mark_node;
}
if (code == BOOLEAN_TYPE)
return cp_truthvalue_conversion (e);
return fold (convert_to_integer (type, e));
}
if (POINTER_TYPE_P (type) || TYPE_PTR_TO_MEMBER_P (type))
return fold (cp_convert_to_pointer (type, e, false));
if (code == VECTOR_TYPE)
return fold (convert_to_vector (type, e));
if (code == REAL_TYPE || code == COMPLEX_TYPE)
{
if (IS_AGGR_TYPE (TREE_TYPE (e)))
{
tree rval;
rval = build_type_conversion (type, e);
if (rval)
return rval;
else
if (flags & LOOKUP_COMPLAIN)
error ("`%#T' used where a floating point value was expected",
TREE_TYPE (e));
}
if (code == REAL_TYPE)
return fold (convert_to_real (type, e));
else if (code == COMPLEX_TYPE)
return fold (convert_to_complex (type, e));
}
/* New C++ semantics: since assignment is now based on
memberwise copying, if the rhs type is derived from the
lhs type, then we may still do a conversion. */
if (IS_AGGR_TYPE_CODE (code))
{
tree dtype = TREE_TYPE (e);
tree ctor = NULL_TREE;
dtype = TYPE_MAIN_VARIANT (dtype);
/* Conversion between aggregate types. New C++ semantics allow
objects of derived type to be cast to objects of base type.
Old semantics only allowed this between pointers.
There may be some ambiguity between using a constructor
vs. using a type conversion operator when both apply. */
ctor = e;
if (abstract_virtuals_error (NULL_TREE, type))
return error_mark_node;
if ((flags & LOOKUP_ONLYCONVERTING)
&& ! (IS_AGGR_TYPE (dtype) && DERIVED_FROM_P (type, dtype)))
/* For copy-initialization, first we create a temp of the proper type
with a user-defined conversion sequence, then we direct-initialize
the target with the temp (see [dcl.init]). */
ctor = build_user_type_conversion (type, ctor, flags);
else
ctor = build_special_member_call (NULL_TREE,
complete_ctor_identifier,
build_tree_list (NULL_TREE, ctor),
TYPE_BINFO (type), flags);
if (ctor)
return build_cplus_new (type, ctor);
}
if (flags & LOOKUP_COMPLAIN)
error ("conversion from `%T' to non-scalar type `%T' requested",
TREE_TYPE (expr), type);
if (flags & LOOKUP_SPECULATIVELY)
return NULL_TREE;
return error_mark_node;
}
tree
convert_to_void (tree expr, impl_conv_void implicit, tsubst_flags_t complain)
{
if (expr == error_mark_node
|| TREE_TYPE (expr) == error_mark_node)
return error_mark_node;
if (implicit == ICV_CAST)
mark_exp_read (expr);
else
{
tree exprv = expr;
while (TREE_CODE (exprv) == COMPOUND_EXPR)
exprv = TREE_OPERAND (exprv, 1);
if (DECL_P (exprv)
|| handled_component_p (exprv)
|| TREE_CODE (exprv) == INDIRECT_REF)
/* Expr is not being 'used' here, otherwise we whould have
called mark_{rl}value_use use here, which would have in turn
called mark_exp_read. Rather, we call mark_exp_read directly
to avoid some warnings when
-Wunused-but-set-{variable,parameter} is in effect. */
mark_exp_read (exprv);
}
if (!TREE_TYPE (expr))
return expr;
if (invalid_nonstatic_memfn_p (expr, complain))
return error_mark_node;
if (TREE_CODE (expr) == PSEUDO_DTOR_EXPR)
{
if (complain & tf_error)
error ("pseudo-destructor is not called");
return error_mark_node;
}
if (VOID_TYPE_P (TREE_TYPE (expr)))
return expr;
switch (TREE_CODE (expr))
{
case COND_EXPR:
{
/* The two parts of a cond expr might be separate lvalues. */
tree op1 = TREE_OPERAND (expr,1);
tree op2 = TREE_OPERAND (expr,2);
bool side_effects = TREE_SIDE_EFFECTS (op1) || TREE_SIDE_EFFECTS (op2);
tree new_op1, new_op2;
if (implicit != ICV_CAST && !side_effects)
{
new_op1 = convert_to_void (op1, ICV_SECOND_OF_COND, complain);
new_op2 = convert_to_void (op2, ICV_THIRD_OF_COND, complain);
}
else
{
new_op1 = convert_to_void (op1, ICV_CAST, complain);
new_op2 = convert_to_void (op2, ICV_CAST, complain);
}
expr = build3 (COND_EXPR, TREE_TYPE (new_op1),
TREE_OPERAND (expr, 0), new_op1, new_op2);
break;
}
case COMPOUND_EXPR:
{
/* The second part of a compound expr contains the value. */
tree op1 = TREE_OPERAND (expr,1);
tree new_op1;
if (implicit != ICV_CAST && !TREE_NO_WARNING (expr))
new_op1 = convert_to_void (op1, ICV_RIGHT_OF_COMMA, complain);
else
new_op1 = convert_to_void (op1, ICV_CAST, complain);
if (new_op1 != op1)
{
tree t = build2 (COMPOUND_EXPR, TREE_TYPE (new_op1),
TREE_OPERAND (expr, 0), new_op1);
expr = t;
}
break;
}
case NON_LVALUE_EXPR:
case NOP_EXPR:
/* These have already decayed to rvalue. */
break;
case CALL_EXPR: /* We have a special meaning for volatile void fn(). */
break;
case INDIRECT_REF:
{
tree type = TREE_TYPE (expr);
int is_reference = TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0)))
== REFERENCE_TYPE;
int is_volatile = TYPE_VOLATILE (type);
int is_complete = COMPLETE_TYPE_P (complete_type (type));
/* Can't load the value if we don't know the type. */
if (is_volatile && !is_complete)
{
if (complain & tf_warning)
switch (implicit)
{
case ICV_CAST:
warning (0, "conversion to void will not access "
"object of incomplete type %qT", type);
break;
case ICV_SECOND_OF_COND:
warning (0, "indirection will not access object of "
"incomplete type %qT in second operand "
"of conditional expression", type);
break;
case ICV_THIRD_OF_COND:
warning (0, "indirection will not access object of "
"incomplete type %qT in third operand "
"of conditional expression", type);
break;
case ICV_RIGHT_OF_COMMA:
warning (0, "indirection will not access object of "
"incomplete type %qT in right operand of "
"comma operator", type);
break;
case ICV_LEFT_OF_COMMA:
warning (0, "indirection will not access object of "
"incomplete type %qT in left operand of "
"comma operator", type);
break;
case ICV_STATEMENT:
warning (0, "indirection will not access object of "
"incomplete type %qT in statement", type);
break;
case ICV_THIRD_IN_FOR:
warning (0, "indirection will not access object of "
"incomplete type %qT in for increment "
"expression", type);
break;
default:
gcc_unreachable ();
}
}
/* Don't load the value if this is an implicit dereference, or if
the type needs to be handled by ctors/dtors. */
else if (is_volatile && is_reference)
{
if (complain & tf_warning)
switch (implicit)
{
case ICV_CAST:
warning (0, "conversion to void will not access "
"object of type %qT", type);
break;
case ICV_SECOND_OF_COND:
warning (0, "implicit dereference will not access object "
"of type %qT in second operand of "
"conditional expression", type);
break;
case ICV_THIRD_OF_COND:
warning (0, "implicit dereference will not access object "
"of type %qT in third operand of "
"conditional expression", type);
break;
case ICV_RIGHT_OF_COMMA:
warning (0, "implicit dereference will not access object "
"of type %qT in right operand of "
"comma operator", type);
break;
case ICV_LEFT_OF_COMMA:
warning (0, "implicit dereference will not access object "
"of type %qT in left operand of comma operator",
type);
break;
case ICV_STATEMENT:
warning (0, "implicit dereference will not access object "
"of type %qT in statement", type);
break;
case ICV_THIRD_IN_FOR:
warning (0, "implicit dereference will not access object "
"of type %qT in for increment expression",
type);
break;
default:
gcc_unreachable ();
}
}
else if (is_volatile && TREE_ADDRESSABLE (type))
{
if (complain & tf_warning)
switch (implicit)
{
case ICV_CAST:
warning (0, "conversion to void will not access "
"object of non-trivially-copyable type %qT",
type);
break;
case ICV_SECOND_OF_COND:
warning (0, "indirection will not access object of "
"non-trivially-copyable type %qT in second "
"operand of conditional expression", type);
break;
case ICV_THIRD_OF_COND:
warning (0, "indirection will not access object of "
"non-trivially-copyable type %qT in third "
"operand of conditional expression", type);
break;
case ICV_RIGHT_OF_COMMA:
warning (0, "indirection will not access object of "
"non-trivially-copyable type %qT in right "
"operand of comma operator", type);
break;
case ICV_LEFT_OF_COMMA:
warning (0, "indirection will not access object of "
"non-trivially-copyable type %qT in left "
"operand of comma operator", type);
break;
case ICV_STATEMENT:
warning (0, "indirection will not access object of "
"non-trivially-copyable type %qT in statement",
type);
break;
case ICV_THIRD_IN_FOR:
warning (0, "indirection will not access object of "
"non-trivially-copyable type %qT in for "
"increment expression", type);
break;
default:
gcc_unreachable ();
}
}
if (is_reference || !is_volatile || !is_complete || TREE_ADDRESSABLE (type))
{
/* Emit a warning (if enabled) when the "effect-less" INDIRECT_REF
operation is stripped off. Note that we don't warn about
- an expression with TREE_NO_WARNING set. (For an example of
such expressions, see build_over_call in call.c.)
- automatic dereferencing of references, since the user cannot
control it. (See also warn_if_unused_value() in stmt.c.) */
if (warn_unused_value
&& implicit != ICV_CAST
&& (complain & tf_warning)
&& !TREE_NO_WARNING (expr)
&& !is_reference)
warning (OPT_Wunused_value, "value computed is not used");
expr = TREE_OPERAND (expr, 0);
}
break;
}
case VAR_DECL:
{
/* External variables might be incomplete. */
tree type = TREE_TYPE (expr);
int is_complete = COMPLETE_TYPE_P (complete_type (type));
if (TYPE_VOLATILE (type) && !is_complete && (complain & tf_warning))
switch (implicit)
{
case ICV_CAST:
warning (0, "conversion to void will not access "
"object %qE of incomplete type %qT", expr, type);
break;
case ICV_SECOND_OF_COND:
warning (0, "variable %qE of incomplete type %qT will not "
"be accessed in second operand of "
"conditional expression", expr, type);
break;
case ICV_THIRD_OF_COND:
warning (0, "variable %qE of incomplete type %qT will not "
"be accessed in third operand of "
"conditional expression", expr, type);
break;
case ICV_RIGHT_OF_COMMA:
warning (0, "variable %qE of incomplete type %qT will not "
"be accessed in right operand of comma operator",
expr, type);
break;
case ICV_LEFT_OF_COMMA:
warning (0, "variable %qE of incomplete type %qT will not "
"be accessed in left operand of comma operator",
expr, type);
break;
case ICV_STATEMENT:
warning (0, "variable %qE of incomplete type %qT will not "
"be accessed in statement", expr, type);
break;
case ICV_THIRD_IN_FOR:
warning (0, "variable %qE of incomplete type %qT will not "
"be accessed in for increment expression",
expr, type);
break;
default:
gcc_unreachable ();
}
break;
}
case TARGET_EXPR:
/* Don't bother with the temporary object returned from a function if
we don't use it and don't need to destroy it. We'll still
allocate space for it in expand_call or declare_return_variable,
but we don't need to track it through all the tree phases. */
if (TARGET_EXPR_IMPLICIT_P (expr)
&& TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (expr)))
{
tree init = TARGET_EXPR_INITIAL (expr);
if (TREE_CODE (init) == AGGR_INIT_EXPR
&& !AGGR_INIT_VIA_CTOR_P (init))
{
tree fn = AGGR_INIT_EXPR_FN (init);
expr = build_call_array_loc (input_location,
TREE_TYPE (TREE_TYPE (TREE_TYPE (fn))),
fn,
aggr_init_expr_nargs (init),
AGGR_INIT_EXPR_ARGP (init));
}
}
break;
default:;
}
expr = resolve_nondeduced_context (expr);
{
tree probe = expr;
if (TREE_CODE (probe) == ADDR_EXPR)
probe = TREE_OPERAND (expr, 0);
if (type_unknown_p (probe))
{
/* [over.over] enumerates the places where we can take the address
of an overloaded function, and this is not one of them. */
if (complain & tf_error)
switch (implicit)
{
case ICV_CAST:
error ("conversion to void "
"cannot resolve address of overloaded function");
break;
case ICV_SECOND_OF_COND:
error ("second operand of conditional expression "
"cannot resolve address of overloaded function");
break;
case ICV_THIRD_OF_COND:
error ("third operand of conditional expression "
"cannot resolve address of overloaded function");
break;
case ICV_RIGHT_OF_COMMA:
error ("right operand of comma operator "
"cannot resolve address of overloaded function");
break;
case ICV_LEFT_OF_COMMA:
error ("left operand of comma operator "
"cannot resolve address of overloaded function");
break;
case ICV_STATEMENT:
error ("statement "
"cannot resolve address of overloaded function");
break;
case ICV_THIRD_IN_FOR:
error ("for increment expression "
"cannot resolve address of overloaded function");
break;
}
else
return error_mark_node;
expr = void_zero_node;
}
else if (implicit != ICV_CAST && probe == expr && is_overloaded_fn (probe))
{
/* Only warn when there is no &. */
if (complain & tf_warning)
switch (implicit)
{
case ICV_SECOND_OF_COND:
warning (OPT_Waddress,
"second operand of conditional expression "
"is a reference, not call, to function %qE", expr);
break;
case ICV_THIRD_OF_COND:
warning (OPT_Waddress,
"third operand of conditional expression "
"is a reference, not call, to function %qE", expr);
break;
case ICV_RIGHT_OF_COMMA:
warning (OPT_Waddress,
"right operand of comma operator "
"is a reference, not call, to function %qE", expr);
break;
case ICV_LEFT_OF_COMMA:
warning (OPT_Waddress,
"left operand of comma operator "
"is a reference, not call, to function %qE", expr);
break;
case ICV_STATEMENT:
warning (OPT_Waddress,
"statement is a reference, not call, to function %qE",
expr);
break;
case ICV_THIRD_IN_FOR:
warning (OPT_Waddress,
"for increment expression "
"is a reference, not call, to function %qE", expr);
break;
default:
gcc_unreachable ();
}
if (TREE_CODE (expr) == COMPONENT_REF)
expr = TREE_OPERAND (expr, 0);
}
}
if (expr != error_mark_node && !VOID_TYPE_P (TREE_TYPE (expr)))
{
if (implicit != ICV_CAST
&& warn_unused_value
&& !TREE_NO_WARNING (expr)
&& !processing_template_decl)
{
/* The middle end does not warn about expressions that have
been explicitly cast to void, so we must do so here. */
if (!TREE_SIDE_EFFECTS (expr)) {
if (complain & tf_warning)
switch (implicit)
{
case ICV_SECOND_OF_COND:
warning (OPT_Wunused_value,
"second operand of conditional expression has no effect");
break;
case ICV_THIRD_OF_COND:
warning (OPT_Wunused_value,
"third operand of conditional expression has no effect");
break;
case ICV_RIGHT_OF_COMMA:
warning (OPT_Wunused_value,
"right operand of comma operator has no effect");
break;
case ICV_LEFT_OF_COMMA:
warning (OPT_Wunused_value,
"left operand of comma operator has no effect");
break;
case ICV_STATEMENT:
warning (OPT_Wunused_value,
"statement has no effect");
break;
case ICV_THIRD_IN_FOR:
warning (OPT_Wunused_value,
"for increment expression has no effect");
break;
default:
gcc_unreachable ();
}
}
else
{
tree e;
enum tree_code code;
enum tree_code_class tclass;
e = expr;
/* We might like to warn about (say) "(int) f()", as the
cast has no effect, but the compiler itself will
generate implicit conversions under some
circumstances. (For example a block copy will be
turned into a call to "__builtin_memcpy", with a
conversion of the return value to an appropriate
type.) So, to avoid false positives, we strip
conversions. Do not use STRIP_NOPs because it will
not strip conversions to "void", as that is not a
mode-preserving conversion. */
while (TREE_CODE (e) == NOP_EXPR)
e = TREE_OPERAND (e, 0);
code = TREE_CODE (e);
tclass = TREE_CODE_CLASS (code);
if ((tclass == tcc_comparison
|| tclass == tcc_unary
|| (tclass == tcc_binary
&& !(code == MODIFY_EXPR
|| code == INIT_EXPR
|| code == PREDECREMENT_EXPR
|| code == PREINCREMENT_EXPR
|| code == POSTDECREMENT_EXPR
|| code == POSTINCREMENT_EXPR)))
&& (complain & tf_warning))
warning (OPT_Wunused_value, "value computed is not used");
}
}
expr = build1 (CONVERT_EXPR, void_type_node, expr);
}
if (! TREE_SIDE_EFFECTS (expr))
expr = void_zero_node;
return expr;
}
