#include "tree.h"
#include <stdio.h>
#include "cp-tree.h"
-#include "class.h"
#include "output.h"
#include "flags.h"
extern int inhibit_warnings;
extern tree ctor_label, dtor_label;
-/* Compute the ease with which a conversion can be performed
- between an expected and the given type. */
+static tree build_new_method_call PROTO((tree, tree, tree, tree, int));
-static struct harshness_code convert_harshness PROTO((register tree, register tree, tree));
-static tree build_new_method_call PROTO((tree, tree, tree, tree, int));
-
-static int rank_for_ideal PROTO((struct candidate *,
- struct candidate *));
-static int user_harshness PROTO((tree, tree));
-static int strictly_better PROTO((unsigned int, unsigned int));
-static struct candidate * ideal_candidate PROTO((struct candidate *,
- int, int));
-static int may_be_remote PROTO((tree));
static tree build_field_call PROTO((tree, tree, tree, tree));
static tree find_scoped_type PROTO((tree, tree, tree));
-static void print_candidates PROTO((tree));
static struct z_candidate * tourney PROTO((struct z_candidate *));
static int joust PROTO((struct z_candidate *, struct z_candidate *));
static int compare_qual PROTO((tree, tree));
static tree strip_top_quals PROTO((tree));
static tree non_reference PROTO((tree));
static tree build_conv PROTO((enum tree_code, tree, tree));
-static void print_n_candidates PROTO((struct candidate *, int));
static tree default_parm_conversions PROTO((tree, tree *));
static int is_subseq PROTO((tree, tree));
-#define EVIL_RETURN(ARG) ((ARG).code = EVIL_CODE, (ARG))
-#define STD_RETURN(ARG) ((ARG).code = STD_CODE, (ARG))
-#define QUAL_RETURN(ARG) ((ARG).code = QUAL_CODE, (ARG))
-#define TRIVIAL_RETURN(ARG) ((ARG).code = TRIVIAL_CODE, (ARG))
-#define ZERO_RETURN(ARG) ((ARG).code = 0, (ARG))
-
-/* Ordering function for overload resolution. Compare two candidates
- by gross quality. */
-
-int
-rank_for_overload (x, y)
- struct candidate *x, *y;
+tree
+build_vfield_ref (datum, type)
+ tree datum, type;
{
- if (y->h.code & (EVIL_CODE|ELLIPSIS_CODE|USER_CODE))
- return y->h.code - x->h.code;
- if (x->h.code & (EVIL_CODE|ELLIPSIS_CODE|USER_CODE))
- return -1;
-
- /* This is set by compute_conversion_costs, for calling a non-const
- member function from a const member function. */
- if ((y->harshness[0].code & CONST_CODE) ^ (x->harshness[0].code & CONST_CODE))
- return y->harshness[0].code - x->harshness[0].code;
-
- if (y->h.code & STD_CODE)
- {
- if (x->h.code & STD_CODE)
- return y->h.distance - x->h.distance;
- return 1;
- }
- if (x->h.code & STD_CODE)
- return -1;
-
- return y->h.code - x->h.code;
-}
+ tree rval;
+ int old_assume_nonnull_objects = flag_assume_nonnull_objects;
-/* Compare two candidates, argument by argument. */
+ if (datum == error_mark_node)
+ return error_mark_node;
-static int
-rank_for_ideal (x, y)
- struct candidate *x, *y;
-{
- int i;
+ /* Vtable references are always made from non-null objects. */
+ flag_assume_nonnull_objects = 1;
+ if (TREE_CODE (TREE_TYPE (datum)) == REFERENCE_TYPE)
+ datum = convert_from_reference (datum);
- if (x->h_len != y->h_len)
- abort ();
+ if (! TYPE_USES_COMPLEX_INHERITANCE (type))
+ rval = build (COMPONENT_REF, TREE_TYPE (CLASSTYPE_VFIELD (type)),
+ datum, CLASSTYPE_VFIELD (type));
+ else
+ rval = build_component_ref (datum, DECL_NAME (CLASSTYPE_VFIELD (type)), NULL_TREE, 0);
+ flag_assume_nonnull_objects = old_assume_nonnull_objects;
- for (i = 0; i < x->h_len; i++)
- {
- if (y->harshness[i].code - x->harshness[i].code)
- return y->harshness[i].code - x->harshness[i].code;
- if ((y->harshness[i].code & STD_CODE)
- && (y->harshness[i].distance - x->harshness[i].distance))
- return y->harshness[i].distance - x->harshness[i].distance;
-
- /* They're both the same code. Now see if we're dealing with an
- integral promotion that needs a finer grain of accuracy. */
- if (y->harshness[0].code & PROMO_CODE
- && (y->harshness[i].int_penalty ^ x->harshness[i].int_penalty))
- return y->harshness[i].int_penalty - x->harshness[i].int_penalty;
- }
- return 0;
+ return rval;
}
-/* TYPE is the type we wish to convert to. PARM is the parameter
- we have to work with. We use a somewhat arbitrary cost function
- to measure this conversion. */
+/* Build a call to a member of an object. I.e., one that overloads
+ operator ()(), or is a pointer-to-function or pointer-to-method. */
-static struct harshness_code
-convert_harshness (type, parmtype, parm)
- register tree type, parmtype;
- tree parm;
+static tree
+build_field_call (basetype_path, instance_ptr, name, parms)
+ tree basetype_path, instance_ptr, name, parms;
{
- struct harshness_code h;
- register enum tree_code codel;
- register enum tree_code coder;
- int lvalue;
-
- h.code = 0;
- h.distance = 0;
- h.int_penalty = 0;
-
-#ifdef GATHER_STATISTICS
- n_convert_harshness++;
-#endif
-
- if (TREE_CODE (parmtype) == REFERENCE_TYPE)
- {
- if (parm)
- parm = convert_from_reference (parm);
- parmtype = TREE_TYPE (parmtype);
- lvalue = 1;
- }
- else if (parm)
- lvalue = lvalue_p (parm);
- else
- lvalue = 0;
-
- if (TYPE_PTRMEMFUNC_P (type))
- type = TYPE_PTRMEMFUNC_FN_TYPE (type);
- if (TYPE_PTRMEMFUNC_P (parmtype))
- parmtype = TYPE_PTRMEMFUNC_FN_TYPE (parmtype);
-
- codel = TREE_CODE (type);
- coder = TREE_CODE (parmtype);
-
- if (TYPE_MAIN_VARIANT (parmtype) == TYPE_MAIN_VARIANT (type))
- return ZERO_RETURN (h);
+ tree field, instance;
- if (coder == ERROR_MARK)
- return EVIL_RETURN (h);
+ if (name == ctor_identifier || name == dtor_identifier)
+ return NULL_TREE;
- if (codel == REFERENCE_TYPE)
+ if (instance_ptr == current_class_ptr)
{
- tree ttl, ttr;
- int constp = parm ? TREE_READONLY (parm) : TYPE_READONLY (parmtype);
- int volatilep = (parm ? TREE_THIS_VOLATILE (parm)
- : TYPE_VOLATILE (parmtype));
- register tree intype = TYPE_MAIN_VARIANT (parmtype);
- register enum tree_code form = TREE_CODE (intype);
- int penalty = 0;
-
- ttl = TREE_TYPE (type);
-
- /* Only allow const reference binding if we were given a parm to deal
- with, since it isn't really a conversion. This is a hack to
- prevent build_type_conversion from finding this conversion, but
- still allow overloading to find it. */
- if (! lvalue && ! (parm && TYPE_READONLY (ttl)))
- return EVIL_RETURN (h);
-
- if ((TYPE_READONLY (ttl) < constp)
- || (TYPE_VOLATILE (ttl) < volatilep))
- return EVIL_RETURN (h);
-
- /* When passing a non-const argument into a const reference, dig it a
- little, so a non-const reference is preferred over this one. */
- penalty = ((TYPE_READONLY (ttl) > constp)
- + (TYPE_VOLATILE (ttl) > volatilep));
-
- ttl = TYPE_MAIN_VARIANT (ttl);
-
- if (form == OFFSET_TYPE)
- {
- intype = TREE_TYPE (intype);
- form = TREE_CODE (intype);
- }
-
- ttr = intype;
-
- if (TREE_CODE (ttl) == ARRAY_TYPE && TREE_CODE (ttr) == ARRAY_TYPE)
- {
- if (comptypes (ttl, ttr, 1))
- return ZERO_RETURN (h);
- return EVIL_RETURN (h);
- }
+ /* Check to see if we really have a reference to an instance variable
+ with `operator()()' overloaded. */
+ field = IDENTIFIER_CLASS_VALUE (name);
- h = convert_harshness (ttl, ttr, NULL_TREE);
- if (penalty && h.code == 0)
+ if (field == NULL_TREE)
{
- h.code = QUAL_CODE;
- h.int_penalty = penalty;
+ cp_error ("`this' has no member named `%D'", name);
+ return error_mark_node;
}
- return h;
- }
-
- if (codel == POINTER_TYPE && fntype_p (parmtype))
- {
- tree p1, p2;
- struct harshness_code h1, h2;
-
- /* Get to the METHOD_TYPE or FUNCTION_TYPE that this might be. */
- type = TREE_TYPE (type);
- if (coder == POINTER_TYPE)
+ if (TREE_CODE (field) == FIELD_DECL)
{
- parmtype = TREE_TYPE (parmtype);
- coder = TREE_CODE (parmtype);
- }
-
- if (coder != TREE_CODE (type))
- return EVIL_RETURN (h);
+ /* If it's a field, try overloading operator (),
+ or calling if the field is a pointer-to-function. */
+ instance = build_component_ref_1 (current_class_ref, field, 0);
+ if (instance == error_mark_node)
+ return error_mark_node;
- if (type != parmtype && coder == METHOD_TYPE)
- {
- tree ttl = TYPE_METHOD_BASETYPE (type);
- tree ttr = TYPE_METHOD_BASETYPE (parmtype);
+ if (TYPE_LANG_SPECIFIC (TREE_TYPE (instance)))
+ return build_opfncall (CALL_EXPR, LOOKUP_NORMAL, instance, parms, NULL_TREE);
- int b_or_d = get_base_distance (ttr, ttl, 0, (tree*)0);
- if (b_or_d < 0)
+ if (TREE_CODE (TREE_TYPE (instance)) == POINTER_TYPE)
{
- b_or_d = get_base_distance (ttl, ttr, 0, (tree*)0);
- if (b_or_d < 0)
- return EVIL_RETURN (h);
- h.distance = -b_or_d;
+ if (TREE_CODE (TREE_TYPE (TREE_TYPE (instance))) == FUNCTION_TYPE)
+ return build_function_call (instance, parms);
+ else if (TREE_CODE (TREE_TYPE (TREE_TYPE (instance))) == METHOD_TYPE)
+ return build_function_call (instance, expr_tree_cons (NULL_TREE, current_class_ptr, parms));
}
- else
- h.distance = b_or_d;
- h.code = STD_CODE;
-
- type = build_function_type
- (TREE_TYPE (type), TREE_CHAIN (TYPE_ARG_TYPES (type)));
- parmtype = build_function_type
- (TREE_TYPE (parmtype), TREE_CHAIN (TYPE_ARG_TYPES (parmtype)));
}
+ return NULL_TREE;
+ }
- /* We allow the default conversion between function type
- and pointer-to-function type for free. */
- if (comptypes (type, parmtype, 1))
- return h;
+ /* Check to see if this is not really a reference to an instance variable
+ with `operator()()' overloaded. */
+ field = lookup_field (basetype_path, name, 1, 0);
- if (pedantic)
- return EVIL_RETURN (h);
+ /* This can happen if the reference was ambiguous or for access
+ violations. */
+ if (field == error_mark_node)
+ return error_mark_node;
- /* Compare return types. */
- p1 = TREE_TYPE (type);
- p2 = TREE_TYPE (parmtype);
- h2 = convert_harshness (p1, p2, NULL_TREE);
- if (h2.code & EVIL_CODE)
- return h2;
+ if (field)
+ {
+ tree basetype;
+ tree ftype = TREE_TYPE (field);
- h1.code = TRIVIAL_CODE;
- h1.distance = 0;
+ if (TREE_CODE (ftype) == REFERENCE_TYPE)
+ ftype = TREE_TYPE (ftype);
- if (h2.distance != 0)
+ if (TYPE_LANG_SPECIFIC (ftype))
{
- tree binfo;
-
- /* This only works for pointers. */
- if (TREE_CODE (p1) != POINTER_TYPE
- && TREE_CODE (p1) != REFERENCE_TYPE)
- return EVIL_RETURN (h);
-
- p1 = TREE_TYPE (p1);
- p2 = TREE_TYPE (p2);
- /* Don't die if we happen to be dealing with void*. */
- if (!IS_AGGR_TYPE (p1) || !IS_AGGR_TYPE (p2))
- return EVIL_RETURN (h);
- if (h2.distance < 0)
- binfo = get_binfo (p2, p1, 0);
- else
- binfo = get_binfo (p1, p2, 0);
-
- if (! BINFO_OFFSET_ZEROP (binfo))
- {
-#if 0
- static int explained = 0;
- if (h2.distance < 0)
- message_2_types (sorry, "cannot cast `%s' to `%s' at function call site", p2, p1);
- else
- message_2_types (sorry, "cannot cast `%s' to `%s' at function call site", p1, p2);
+ /* Make the next search for this field very short. */
+ basetype = DECL_FIELD_CONTEXT (field);
+ instance_ptr = convert_pointer_to (basetype, instance_ptr);
- if (! explained++)
- sorry ("(because pointer values change during conversion)");
-#endif
- return EVIL_RETURN (h);
- }
+ instance = build_indirect_ref (instance_ptr, NULL_PTR);
+ return build_opfncall (CALL_EXPR, LOOKUP_NORMAL,
+ build_component_ref_1 (instance, field, 0),
+ parms, NULL_TREE);
}
-
- h1.code |= h2.code;
- if (h2.distance > h1.distance)
- h1.distance = h2.distance;
-
- p1 = TYPE_ARG_TYPES (type);
- p2 = TYPE_ARG_TYPES (parmtype);
- while (p1 && TREE_VALUE (p1) != void_type_node
- && p2 && TREE_VALUE (p2) != void_type_node)
+ if (TREE_CODE (ftype) == POINTER_TYPE)
{
- h2 = convert_harshness (TREE_VALUE (p1), TREE_VALUE (p2),
- NULL_TREE);
- if (h2.code & EVIL_CODE)
- return h2;
-
- if (h2.distance)
+ if (TREE_CODE (TREE_TYPE (ftype)) == FUNCTION_TYPE
+ || TREE_CODE (TREE_TYPE (ftype)) == METHOD_TYPE)
{
- /* This only works for pointers and references. */
- if (TREE_CODE (TREE_VALUE (p1)) != POINTER_TYPE
- && TREE_CODE (TREE_VALUE (p1)) != REFERENCE_TYPE)
- return EVIL_RETURN (h);
- h2.distance = - h2.distance;
+ /* This is a member which is a pointer to function. */
+ tree ref
+ = build_component_ref_1 (build_indirect_ref (instance_ptr,
+ NULL_PTR),
+ field, LOOKUP_COMPLAIN);
+ if (ref == error_mark_node)
+ return error_mark_node;
+ return build_function_call (ref, parms);
}
-
- h1.code |= h2.code;
- if (h2.distance > h1.distance)
- h1.distance = h2.distance;
- p1 = TREE_CHAIN (p1);
- p2 = TREE_CHAIN (p2);
- }
- if (p1 == p2)
- return h1;
- if (p2)
- {
- if (p1)
- return EVIL_RETURN (h);
- h1.code |= ELLIPSIS_CODE;
- return h1;
}
- if (p1)
+ else if (TREE_CODE (ftype) == METHOD_TYPE)
{
- if (TREE_PURPOSE (p1) == NULL_TREE)
- h1.code |= EVIL_CODE;
- return h1;
+ error ("invalid call via pointer-to-member function");
+ return error_mark_node;
}
- }
- else if (codel == POINTER_TYPE && coder == OFFSET_TYPE)
- {
- tree ttl, ttr;
-
- /* Get to the OFFSET_TYPE that this might be. */
- type = TREE_TYPE (type);
-
- if (coder != TREE_CODE (type))
- return EVIL_RETURN (h);
-
- ttl = TYPE_OFFSET_BASETYPE (type);
- ttr = TYPE_OFFSET_BASETYPE (parmtype);
-
- if (ttl == ttr)
- h.code = 0;
else
- {
- int b_or_d = get_base_distance (ttr, ttl, 0, (tree*)0);
- if (b_or_d < 0)
- {
- b_or_d = get_base_distance (ttl, ttr, 0, (tree*)0);
- if (b_or_d < 0)
- return EVIL_RETURN (h);
- h.distance = -b_or_d;
- }
- else
- h.distance = b_or_d;
- h.code = STD_CODE;
- }
-
- /* Now test the OFFSET_TYPE's target compatibility. */
- type = TREE_TYPE (type);
- parmtype = TREE_TYPE (parmtype);
- }
-
- if (coder == UNKNOWN_TYPE)
- {
- if (codel == FUNCTION_TYPE
- || codel == METHOD_TYPE
- || (codel == POINTER_TYPE
- && (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE
- || TREE_CODE (TREE_TYPE (type)) == METHOD_TYPE)))
- return TRIVIAL_RETURN (h);
- return EVIL_RETURN (h);
+ return NULL_TREE;
}
+ return NULL_TREE;
+}
- if (coder == VOID_TYPE)
- return EVIL_RETURN (h);
+static tree
+find_scoped_type (type, inner_name, inner_types)
+ tree type, inner_name, inner_types;
+{
+ tree tags = CLASSTYPE_TAGS (type);
- if (codel == BOOLEAN_TYPE)
+ while (tags)
{
- if (INTEGRAL_CODE_P (coder) || coder == REAL_TYPE)
- return STD_RETURN (h);
- else if (coder == POINTER_TYPE || coder == OFFSET_TYPE)
+ /* The TREE_PURPOSE of an enum tag (which becomes a member of the
+ enclosing class) is set to the name for the enum type. So, if
+ inner_name is `bar', and we strike `baz' for `enum bar { baz }',
+ then this test will be true. */
+ if (TREE_PURPOSE (tags) == inner_name)
{
- /* Make this worse than any conversion to another pointer.
- FIXME this is how I think the language should work, but it may not
- end up being how the language is standardized (jason 1/30/95). */
- h.distance = 32767;
- return STD_RETURN (h);
+ if (inner_types == NULL_TREE)
+ return TYPE_MAIN_DECL (TREE_VALUE (tags));
+ return resolve_scope_to_name (TREE_VALUE (tags), inner_types);
}
- return EVIL_RETURN (h);
+ tags = TREE_CHAIN (tags);
}
- if (INTEGRAL_CODE_P (codel))
- {
- /* Control equivalence of ints an enums. */
+ /* Look for a TYPE_DECL. */
+ for (tags = TYPE_FIELDS (type); tags; tags = TREE_CHAIN (tags))
+ if (TREE_CODE (tags) == TYPE_DECL && DECL_NAME (tags) == inner_name)
+ {
+ /* Code by raeburn. */
+ if (inner_types == NULL_TREE)
+ return tags;
+ return resolve_scope_to_name (TREE_TYPE (tags), inner_types);
+ }
- if (codel == ENUMERAL_TYPE
- && flag_int_enum_equivalence == 0)
- {
- /* Enums can be converted to ints, but not vice-versa. */
- if (coder != ENUMERAL_TYPE
- || TYPE_MAIN_VARIANT (type) != TYPE_MAIN_VARIANT (parmtype))
- return EVIL_RETURN (h);
- }
+ return NULL_TREE;
+}
+
+/* Resolve an expression NAME1::NAME2::...::NAMEn to
+ the name that names the above nested type. INNER_TYPES
+ is a chain of nested type names (held together by SCOPE_REFs);
+ OUTER_TYPE is the type we know to enclose INNER_TYPES.
+ Returns NULL_TREE if there is an error. */
- /* else enums and ints (almost) freely interconvert. */
+tree
+resolve_scope_to_name (outer_type, inner_stuff)
+ tree outer_type, inner_stuff;
+{
+ register tree tmp;
+ tree inner_name, inner_type;
- if (INTEGRAL_CODE_P (coder))
- {
- if (TYPE_MAIN_VARIANT (type)
- == TYPE_MAIN_VARIANT (type_promotes_to (parmtype)))
- {
- h.code = PROMO_CODE;
- }
- else
- h.code = STD_CODE;
-
- return h;
- }
- else if (coder == REAL_TYPE)
- {
- h.code = STD_CODE;
- h.distance = 0;
- return h;
+ if (outer_type == NULL_TREE && current_class_type != NULL_TREE)
+ {
+ /* We first try to look for a nesting in our current class context,
+ then try any enclosing classes. */
+ tree type = current_class_type;
+
+ while (type && (TREE_CODE (type) == RECORD_TYPE
+ || TREE_CODE (type) == UNION_TYPE))
+ {
+ tree rval = resolve_scope_to_name (type, inner_stuff);
+
+ if (rval != NULL_TREE)
+ return rval;
+ type = DECL_CONTEXT (TYPE_MAIN_DECL (type));
}
}
- if (codel == REAL_TYPE)
+ if (TREE_CODE (inner_stuff) == SCOPE_REF)
{
- if (coder == REAL_TYPE)
- {
- if (TYPE_MAIN_VARIANT (type)
- == TYPE_MAIN_VARIANT (type_promotes_to (parmtype)))
- h.code = PROMO_CODE;
- else
- h.code = STD_CODE;
-
- return h;
- }
- else if (INTEGRAL_CODE_P (coder))
- {
- h.code = STD_CODE;
- h.distance = 0;
- return h;
- }
+ inner_name = TREE_OPERAND (inner_stuff, 0);
+ inner_type = TREE_OPERAND (inner_stuff, 1);
}
-
- /* Convert arrays which have not previously been converted. */
- if (coder == ARRAY_TYPE)
+ else
{
- coder = POINTER_TYPE;
- if (parm)
- {
- parm = decay_conversion (parm);
- parmtype = TREE_TYPE (parm);
- }
- else
- parmtype = build_pointer_type (TREE_TYPE (parmtype));
+ inner_name = inner_stuff;
+ inner_type = NULL_TREE;
}
- /* Conversions among pointers */
- if (codel == POINTER_TYPE && coder == POINTER_TYPE)
+ if (outer_type == NULL_TREE)
{
- register tree ttl = TYPE_MAIN_VARIANT (TREE_TYPE (type));
- register tree ttr = TYPE_MAIN_VARIANT (TREE_TYPE (parmtype));
- int penalty = 4 * (ttl != ttr);
-
- /* Anything converts to void *. Since this may be `const void *'
- (etc.) use VOID_TYPE instead of void_type_node. Otherwise, the
- targets must be the same, except that we do allow (at some cost)
- conversion between signed and unsigned pointer types. */
-
- if ((TREE_CODE (ttl) == METHOD_TYPE
- || TREE_CODE (ttl) == FUNCTION_TYPE)
- && TREE_CODE (ttl) == TREE_CODE (ttr))
+ tree x;
+ /* If we have something that's already a type by itself,
+ use that. */
+ if (IDENTIFIER_HAS_TYPE_VALUE (inner_name))
{
- if (comptypes (ttl, ttr, -1))
- {
- h.code = penalty ? STD_CODE : 0;
- h.distance = 0;
- }
- else
- h.code = EVIL_CODE;
- return h;
+ if (inner_type)
+ return resolve_scope_to_name (IDENTIFIER_TYPE_VALUE (inner_name),
+ inner_type);
+ return inner_name;
}
+
+ x = lookup_name (inner_name, 0);
-#if 1
- if (TREE_CODE (ttl) != VOID_TYPE
- && (TREE_CODE (ttr) != VOID_TYPE || !parm || !null_ptr_cst_p (parm)))
+ if (x && TREE_CODE (x) == NAMESPACE_DECL)
{
- if (comp_target_types (type, parmtype, 1) <= 0)
- return EVIL_RETURN (h);
+ x = lookup_namespace_name (x, inner_type);
+ return x;
}
-#else
- if (!(TREE_CODE (ttl) == VOID_TYPE
- || TREE_CODE (ttr) == VOID_TYPE
- || (TREE_UNSIGNED (ttl) ^ TREE_UNSIGNED (ttr)
- && (ttl = unsigned_type (ttl),
- ttr = unsigned_type (ttr),
- penalty = 10, 0))
- || (comp_target_types (ttl, ttr, 0) > 0)))
- return EVIL_RETURN (h);
-#endif
+ return NULL_TREE;
+ }
- if (ttr == ttl)
- {
- tree tmp1 = TREE_TYPE (type), tmp2 = TREE_TYPE (parmtype);
-
- h.code = 0;
- /* Note conversion from `T*' to `const T*',
- or `T*' to `volatile T*'. */
- if ((TYPE_READONLY (tmp1) < TREE_READONLY (tmp2))
- || (TYPE_VOLATILE (tmp1) < TYPE_VOLATILE (tmp2)))
- h.code = EVIL_CODE;
- else if ((TYPE_READONLY (tmp1) != TREE_READONLY (tmp2))
- || (TYPE_VOLATILE (tmp1) != TYPE_VOLATILE (tmp2)))
- h.code |= QUAL_CODE;
-
- h.distance = 0;
- return h;
- }
-
-
- if (TREE_CODE (ttl) == RECORD_TYPE && TREE_CODE (ttr) == RECORD_TYPE)
- {
- int b_or_d = get_base_distance (ttl, ttr, 0, (tree*)0);
- if (b_or_d < 0)
- {
- b_or_d = get_base_distance (ttr, ttl, 0, (tree*)0);
- if (b_or_d < 0)
- return EVIL_RETURN (h);
- h.distance = -b_or_d;
- }
- else
- h.distance = b_or_d;
- h.code = STD_CODE;
- return h;
- }
-
- /* If converting from a `class*' to a `void*', make it
- less favorable than any inheritance relationship. */
- if (TREE_CODE (ttl) == VOID_TYPE && IS_AGGR_TYPE (ttr))
- {
- h.code = STD_CODE;
- h.distance = CLASSTYPE_MAX_DEPTH (ttr)+1;
- return h;
- }
-
- h.code = penalty ? STD_CODE : PROMO_CODE;
- /* Catch things like `const char *' -> `const void *'
- vs `const char *' -> `void *'. */
- if (ttl != ttr)
- {
- tree tmp1 = TREE_TYPE (type), tmp2 = TREE_TYPE (parmtype);
- if ((TYPE_READONLY (tmp1) < TREE_READONLY (tmp2))
- || (TYPE_VOLATILE (tmp1) < TYPE_VOLATILE (tmp2)))
- h.code = EVIL_CODE;
- else if ((TYPE_READONLY (tmp1) > TREE_READONLY (tmp2))
- || (TYPE_VOLATILE (tmp1) > TYPE_VOLATILE (tmp2)))
- h.code |= QUAL_CODE;
- }
- return h;
- }
-
- if (codel == POINTER_TYPE && coder == INTEGER_TYPE)
- {
- /* This is not a bad match, but don't let it beat
- integer-enum combinations. */
- if (parm && integer_zerop (parm))
- {
- h.code = STD_CODE;
- h.distance = 0;
- return h;
- }
- }
-
- /* C++: Since the `this' parameter of a signature member function
- is represented as a signature pointer to handle default implementations
- correctly, we can have the case that `type' is a signature pointer
- while `parmtype' is a pointer to a signature table. We don't really
- do any conversions in this case, so just return 0. */
-
- if (codel == RECORD_TYPE && coder == POINTER_TYPE
- && IS_SIGNATURE_POINTER (type) && IS_SIGNATURE (TREE_TYPE (parmtype)))
- return ZERO_RETURN (h);
-
- if (codel == RECORD_TYPE && coder == RECORD_TYPE)
- {
- int b_or_d = get_base_distance (type, parmtype, 0, (tree*)0);
- if (b_or_d < 0)
- {
- b_or_d = get_base_distance (parmtype, type, 0, (tree*)0);
- if (b_or_d < 0)
- return EVIL_RETURN (h);
- h.distance = -b_or_d;
- }
- else
- h.distance = b_or_d;
- h.code = STD_CODE;
- return h;
- }
- return EVIL_RETURN (h);
-}
-
-/* A clone of build_type_conversion for checking user-defined conversions in
- overload resolution. */
-
-static int
-user_harshness (type, parmtype)
- register tree type, parmtype;
-{
- tree conv;
- tree winner = NULL_TREE;
- int code = 0;
-
- {
- tree typename = build_typename_overload (type);
- if (lookup_fnfields (TYPE_BINFO (parmtype), typename, 0))
- return 0;
- }
-
- for (conv = lookup_conversions (parmtype); conv; conv = TREE_CHAIN (conv))
- {
- struct harshness_code tmp;
- tree cand = TREE_VALUE (conv);
-
- if (winner && winner == cand)
- continue;
-
- tmp = convert_harshness (type, TREE_TYPE (TREE_TYPE (cand)), NULL_TREE);
- if ((tmp.code < USER_CODE) && (tmp.distance >= 0))
- {
- if (winner)
- return EVIL_CODE;
- else
- {
- winner = cand;
- code = tmp.code;
- }
- }
- }
-
- if (winner)
- return code;
-
- return -1;
-}
-
-#ifdef DEBUG_MATCHING
-static char *
-print_harshness (h)
- struct harshness_code *h;
-{
- static char buf[1024];
- char tmp[1024];
-
- bzero (buf, 1024 * sizeof (char));
- strcat (buf, "codes=[");
- if (h->code & EVIL_CODE)
- strcat (buf, "EVIL");
- if (h->code & CONST_CODE)
- strcat (buf, " CONST");
- if (h->code & ELLIPSIS_CODE)
- strcat (buf, " ELLIPSIS");
- if (h->code & USER_CODE)
- strcat (buf, " USER");
- if (h->code & STD_CODE)
- strcat (buf, " STD");
- if (h->code & PROMO_CODE)
- strcat (buf, " PROMO");
- if (h->code & QUAL_CODE)
- strcat (buf, " QUAL");
- if (h->code & TRIVIAL_CODE)
- strcat (buf, " TRIVIAL");
- if (buf[0] == '\0')
- strcat (buf, "0");
-
- sprintf (tmp, "] distance=%d int_penalty=%d", h->distance, h->int_penalty);
-
- strcat (buf, tmp);
-
- return buf;
-}
-#endif
-
-/* Algorithm: For each argument, calculate how difficult it is to
- make FUNCTION accept that argument. If we can easily tell that
- FUNCTION won't be acceptable to one of the arguments, then we
- don't need to compute the ease of converting the other arguments,
- since it will never show up in the intersection of all arguments'
- favorite functions.
-
- Conversions between builtin and user-defined types are allowed, but
- no function involving such a conversion is preferred to one which
- does not require such a conversion. Furthermore, such conversions
- must be unique. */
-
-void
-compute_conversion_costs (function, tta_in, cp, arglen)
- tree function;
- tree tta_in;
- struct candidate *cp;
- int arglen;
-{
- tree ttf_in = TYPE_ARG_TYPES (TREE_TYPE (function));
- tree ttf = ttf_in;
- tree tta = tta_in;
-
- /* Start out with no strikes against. */
- int evil_strikes = 0;
- int ellipsis_strikes = 0;
- int user_strikes = 0;
- int b_or_d_strikes = 0;
- int easy_strikes = 0;
-
- int strike_index = 0, win;
- struct harshness_code lose;
- extern int cp_silent;
-
-#ifdef GATHER_STATISTICS
- n_compute_conversion_costs++;
-#endif
-
-#ifndef DEBUG_MATCHING
- /* We don't emit any warnings or errors while trying out each candidate. */
- cp_silent = 1;
-#endif
-
- cp->function = function;
- cp->arg = tta ? TREE_VALUE (tta) : NULL_TREE;
- cp->u.bad_arg = 0; /* optimistic! */
-
- cp->h.code = 0;
- cp->h.distance = 0;
- cp->h.int_penalty = 0;
- bzero ((char *) cp->harshness,
- (cp->h_len + 1) * sizeof (struct harshness_code));
-
- while (ttf && tta)
- {
- struct harshness_code h;
-
- if (ttf == void_list_node)
- break;
-
- if (type_unknown_p (TREE_VALUE (tta)))
- {
- /* Must perform some instantiation here. */
- tree rhs = TREE_VALUE (tta);
- tree lhstype = TREE_VALUE (ttf);
-
- /* Keep quiet about possible contravariance violations. */
- int old_inhibit_warnings = inhibit_warnings;
- inhibit_warnings = 1;
-
- /* @@ This is to undo what `grokdeclarator' does to
- parameter types. It really should go through
- something more general. */
-
- TREE_TYPE (tta) = unknown_type_node;
- rhs = instantiate_type (lhstype, rhs, 0);
- inhibit_warnings = old_inhibit_warnings;
-
- if (TREE_CODE (rhs) == ERROR_MARK)
- h.code = EVIL_CODE;
- else
- h = convert_harshness (lhstype, TREE_TYPE (rhs), rhs);
- }
- else
- {
-#ifdef DEBUG_MATCHING
- static tree old_function = NULL_TREE;
-
- if (!old_function || function != old_function)
- {
- cp_error ("trying %D", function);
- old_function = function;
- }
-
- cp_error (" doing (%T) %E against arg %T",
- TREE_TYPE (TREE_VALUE (tta)), TREE_VALUE (tta),
- TREE_VALUE (ttf));
-#endif
-
- h = convert_harshness (TREE_VALUE (ttf),
- TREE_TYPE (TREE_VALUE (tta)),
- TREE_VALUE (tta));
-
-#ifdef DEBUG_MATCHING
- cp_error (" evaluated %s", print_harshness (&h));
-#endif
- }
-
- cp->harshness[strike_index] = h;
- if ((h.code & EVIL_CODE)
- || ((h.code & STD_CODE) && h.distance < 0))
- {
- cp->u.bad_arg = strike_index;
- evil_strikes = 1;
- }
- else if (h.code & ELLIPSIS_CODE)
- ellipsis_strikes += 1;
-#if 0
- /* This is never set by `convert_harshness'. */
- else if (h.code & USER_CODE)
- {
- user_strikes += 1;
- }
-#endif
- else
- {
- if ((h.code & STD_CODE) && h.distance)
- {
- if (h.distance > b_or_d_strikes)
- b_or_d_strikes = h.distance;
- }
- else
- easy_strikes += (h.code & (STD_CODE|PROMO_CODE|TRIVIAL_CODE));
- cp->h.code |= h.code;
- /* Make sure we communicate this. */
- cp->h.int_penalty += h.int_penalty;
- }
-
- ttf = TREE_CHAIN (ttf);
- tta = TREE_CHAIN (tta);
- strike_index += 1;
- }
-
- if (tta)
- {
- /* ran out of formals, and parmlist is fixed size. */
- if (ttf /* == void_type_node */)
- {
- cp->h.code = EVIL_CODE;
- cp->u.bad_arg = -1;
- cp_silent = 0;
- return;
- }
- else
- {
- struct harshness_code h;
- int l = list_length (tta);
- ellipsis_strikes += l;
- h.code = ELLIPSIS_CODE;
- h.distance = 0;
- h.int_penalty = 0;
- for (; l; --l)
- cp->harshness[strike_index++] = h;
- }
- }
- else if (ttf && ttf != void_list_node)
- {
- /* ran out of actuals, and no defaults. */
- if (TREE_PURPOSE (ttf) == NULL_TREE)
- {
- cp->h.code = EVIL_CODE;
- cp->u.bad_arg = -2;
- cp_silent = 0;
- return;
- }
- /* Store index of first default. */
- cp->harshness[arglen].distance = strike_index+1;
- }
- else
- cp->harshness[arglen].distance = 0;
-
- /* Argument list lengths work out, so don't need to check them again. */
- if (evil_strikes)
- {
- /* We do not check for derived->base conversions here, since in
- no case would they give evil strike counts, unless such conversions
- are somehow ambiguous. */
-
- /* See if any user-defined conversions apply.
- But make sure that we do not loop. */
- static int dont_convert_types = 0;
-
- if (dont_convert_types)
- {
- cp->h.code = EVIL_CODE;
- cp_silent = 0;
- return;
- }
-
- win = 0; /* Only get one chance to win. */
- ttf = TYPE_ARG_TYPES (TREE_TYPE (function));
- tta = tta_in;
- strike_index = 0;
- evil_strikes = 0;
-
- while (ttf && tta)
- {
- if (ttf == void_list_node)
- break;
-
- lose = cp->harshness[strike_index];
- if ((lose.code & EVIL_CODE)
- || ((lose.code & STD_CODE) && lose.distance < 0))
- {
- tree actual_type = TREE_TYPE (TREE_VALUE (tta));
- tree formal_type = TREE_VALUE (ttf);
- int extra_conversions = 0;
-
- dont_convert_types = 1;
-
- if (TREE_CODE (formal_type) == REFERENCE_TYPE)
- formal_type = TREE_TYPE (formal_type);
- if (TREE_CODE (actual_type) == REFERENCE_TYPE)
- actual_type = TREE_TYPE (actual_type);
-
- if (formal_type != error_mark_node
- && actual_type != error_mark_node)
- {
- formal_type = complete_type (TYPE_MAIN_VARIANT (formal_type));
- actual_type = complete_type (TYPE_MAIN_VARIANT (actual_type));
-
- if (TYPE_HAS_CONSTRUCTOR (formal_type))
- {
- /* If it has a constructor for this type,
- try to use it. */
- /* @@ There is no way to save this result yet, so
- success is a NULL_TREE for now. */
- if (convert_to_aggr (formal_type, TREE_VALUE (tta), 0, 1)
- != error_mark_node)
- win++;
- }
- if (TYPE_LANG_SPECIFIC (actual_type)
- && TYPE_HAS_CONVERSION (actual_type))
- {
- int extra = user_harshness (formal_type, actual_type);
-
- if (extra == EVIL_CODE)
- win += 2;
- else if (extra >= 0)
- {
- win++;
- extra_conversions = extra;
- }
- }
- }
- dont_convert_types = 0;
-
- if (win == 1)
- {
- user_strikes += 1;
- cp->harshness[strike_index].code
- = USER_CODE | (extra_conversions ? STD_CODE : 0);
- win = 0;
- }
- else
- {
- if (cp->u.bad_arg > strike_index)
- cp->u.bad_arg = strike_index;
-
- evil_strikes = win ? 2 : 1;
- break;
- }
- }
-
- ttf = TREE_CHAIN (ttf);
- tta = TREE_CHAIN (tta);
- strike_index += 1;
- }
- }
-
- /* Const member functions get a small penalty because defaulting
- to const is less useful than defaulting to non-const. */
- /* This is bogus, it does not correspond to anything in the ARM.
- This code will be fixed when this entire section is rewritten
- to conform to the ARM. (mrs) */
- if (TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
- {
- tree this_parm = TREE_VALUE (ttf_in);
-
- if (TREE_CODE (this_parm) == RECORD_TYPE /* Is `this' a sig ptr? */
- ? TYPE_READONLY (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (this_parm))))
- : TYPE_READONLY (TREE_TYPE (this_parm)))
- {
- cp->harshness[0].code |= TRIVIAL_CODE;
- ++easy_strikes;
- }
- else
- {
- /* Calling a non-const member function from a const member function
- is probably invalid, but for now we let it only draw a warning.
- We indicate that such a mismatch has occurred by setting the
- harshness to a maximum value. */
- if (TREE_CODE (TREE_TYPE (TREE_VALUE (tta_in))) == POINTER_TYPE
- && (TYPE_READONLY (TREE_TYPE (TREE_TYPE (TREE_VALUE (tta_in))))))
- cp->harshness[0].code |= CONST_CODE;
- }
- }
-
- if (evil_strikes)
- cp->h.code = EVIL_CODE;
- if (ellipsis_strikes)
- cp->h.code |= ELLIPSIS_CODE;
- if (user_strikes)
- cp->h.code |= USER_CODE;
- cp_silent = 0;
-#ifdef DEBUG_MATCHING
- cp_error ("final eval %s", print_harshness (&cp->h));
-#endif
-}
-
-/* Subroutine of ideal_candidate. See if X or Y is a better match
- than the other. */
-
-static int
-strictly_better (x, y)
- unsigned int x, y;
-{
- unsigned short xor;
-
- if (x == y)
- return 0;
-
- xor = x ^ y;
- if (xor >= x || xor >= y)
- return 1;
- return 0;
-}
-
-/* When one of several possible overloaded functions and/or methods
- can be called, choose the best candidate for overloading.
-
- BASETYPE is the context from which we start method resolution
- or NULL if we are comparing overloaded functions.
- CANDIDATES is the array of candidates we have to choose from.
- N_CANDIDATES is the length of CANDIDATES.
- PARMS is a TREE_LIST of parameters to the function we'll ultimately
- choose. It is modified in place when resolving methods. It is not
- modified in place when resolving overloaded functions.
- LEN is the length of the parameter list. */
-
-static struct candidate *
-ideal_candidate (candidates, n_candidates, len)
- struct candidate *candidates;
- int n_candidates;
- int len;
-{
- struct candidate *cp = candidates+n_candidates;
- int i, j = -1, best_code;
-
- /* For each argument, sort the functions from best to worst for the arg.
- For each function that's not best for this arg, set its overall
- harshness to EVIL so that other args won't like it. The candidate
- list for the last argument is the intersection of all the best-liked
- functions. */
-
- qsort (candidates, n_candidates, sizeof (struct candidate),
- (int (*) PROTO((const void *, const void *))) rank_for_overload);
- best_code = cp[-1].h.code;
-
- /* If they're at least as good as each other, do an arg-by-arg check. */
- if (! strictly_better (cp[-1].h.code, cp[-2].h.code))
- {
- int better = 0;
- int worse = 0;
-
- for (j = 0; j < n_candidates; j++)
- if (! strictly_better (candidates[j].h.code, best_code))
- break;
-
- qsort (candidates+j, n_candidates-j, sizeof (struct candidate),
- (int (*) PROTO((const void *, const void *))) rank_for_ideal);
- for (i = 0; i < len; i++)
- {
- if (cp[-1].harshness[i].code < cp[-2].harshness[i].code)
- better = 1;
- else if (cp[-1].harshness[i].code > cp[-2].harshness[i].code)
- worse = 1;
- else if (cp[-1].harshness[i].code & STD_CODE)
- {
- /* If it involves a standard conversion, let the
- inheritance lattice be the final arbiter. */
- if (cp[-1].harshness[i].distance > cp[-2].harshness[i].distance)
- worse = 1;
- else if (cp[-1].harshness[i].distance < cp[-2].harshness[i].distance)
- better = 1;
- }
- else if (cp[-1].harshness[i].code & PROMO_CODE)
- {
- /* For integral promotions, take into account a finer
- granularity for determining which types should be favored
- over others in such promotions. */
- if (cp[-1].harshness[i].int_penalty > cp[-2].harshness[i].int_penalty)
- worse = 1;
- else if (cp[-1].harshness[i].int_penalty < cp[-2].harshness[i].int_penalty)
- better = 1;
- }
- }
-
- if (! better || worse)
- return NULL;
- }
- return cp-1;
-}
-
-/* Assume that if the class referred to is not in the
- current class hierarchy, that it may be remote.
- PARENT is assumed to be of aggregate type here. */
-
-static int
-may_be_remote (parent)
- tree parent;
-{
- if (TYPE_OVERLOADS_METHOD_CALL_EXPR (parent) == 0)
- return 0;
-
- if (current_class_type == NULL_TREE)
- return 0;
-
- if (parent == current_class_type)
- return 0;
-
- if (UNIQUELY_DERIVED_FROM_P (parent, current_class_type))
- return 0;
- return 1;
-}
-
-tree
-build_vfield_ref (datum, type)
- tree datum, type;
-{
- tree rval;
- int old_assume_nonnull_objects = flag_assume_nonnull_objects;
-
- if (datum == error_mark_node)
- return error_mark_node;
-
- /* Vtable references are always made from non-null objects. */
- flag_assume_nonnull_objects = 1;
- if (TREE_CODE (TREE_TYPE (datum)) == REFERENCE_TYPE)
- datum = convert_from_reference (datum);
-
- if (! TYPE_USES_COMPLEX_INHERITANCE (type))
- rval = build (COMPONENT_REF, TREE_TYPE (CLASSTYPE_VFIELD (type)),
- datum, CLASSTYPE_VFIELD (type));
- else
- rval = build_component_ref (datum, DECL_NAME (CLASSTYPE_VFIELD (type)), NULL_TREE, 0);
- flag_assume_nonnull_objects = old_assume_nonnull_objects;
-
- return rval;
-}
-
-/* Build a call to a member of an object. I.e., one that overloads
- operator ()(), or is a pointer-to-function or pointer-to-method. */
-
-static tree
-build_field_call (basetype_path, instance_ptr, name, parms)
- tree basetype_path, instance_ptr, name, parms;
-{
- tree field, instance;
-
- if (name == ctor_identifier || name == dtor_identifier)
- return NULL_TREE;
-
- if (instance_ptr == current_class_ptr)
- {
- /* Check to see if we really have a reference to an instance variable
- with `operator()()' overloaded. */
- field = IDENTIFIER_CLASS_VALUE (name);
-
- if (field == NULL_TREE)
- {
- cp_error ("`this' has no member named `%D'", name);
- return error_mark_node;
- }
-
- if (TREE_CODE (field) == FIELD_DECL)
- {
- /* If it's a field, try overloading operator (),
- or calling if the field is a pointer-to-function. */
- instance = build_component_ref_1 (current_class_ref, field, 0);
- if (instance == error_mark_node)
- return error_mark_node;
-
- if (TYPE_LANG_SPECIFIC (TREE_TYPE (instance))
- && (TYPE_OVERLOADS_CALL_EXPR (TREE_TYPE (instance))
- || flag_ansi_overloading))
- return build_opfncall (CALL_EXPR, LOOKUP_NORMAL, instance, parms, NULL_TREE);
-
- if (TREE_CODE (TREE_TYPE (instance)) == POINTER_TYPE)
- {
- if (TREE_CODE (TREE_TYPE (TREE_TYPE (instance))) == FUNCTION_TYPE)
- return build_function_call (instance, parms);
- else if (TREE_CODE (TREE_TYPE (TREE_TYPE (instance))) == METHOD_TYPE)
- return build_function_call (instance, expr_tree_cons (NULL_TREE, current_class_ptr, parms));
- }
- }
- return NULL_TREE;
- }
-
- /* Check to see if this is not really a reference to an instance variable
- with `operator()()' overloaded. */
- field = lookup_field (basetype_path, name, 1, 0);
-
- /* This can happen if the reference was ambiguous or for access
- violations. */
- if (field == error_mark_node)
- return error_mark_node;
-
- if (field)
- {
- tree basetype;
- tree ftype = TREE_TYPE (field);
-
- if (TREE_CODE (ftype) == REFERENCE_TYPE)
- ftype = TREE_TYPE (ftype);
-
- if (TYPE_LANG_SPECIFIC (ftype)
- && (TYPE_OVERLOADS_CALL_EXPR (ftype) || flag_ansi_overloading))
- {
- /* Make the next search for this field very short. */
- basetype = DECL_FIELD_CONTEXT (field);
- instance_ptr = convert_pointer_to (basetype, instance_ptr);
-
- instance = build_indirect_ref (instance_ptr, NULL_PTR);
- return build_opfncall (CALL_EXPR, LOOKUP_NORMAL,
- build_component_ref_1 (instance, field, 0),
- parms, NULL_TREE);
- }
- if (TREE_CODE (ftype) == POINTER_TYPE)
- {
- if (TREE_CODE (TREE_TYPE (ftype)) == FUNCTION_TYPE
- || TREE_CODE (TREE_TYPE (ftype)) == METHOD_TYPE)
- {
- /* This is a member which is a pointer to function. */
- tree ref
- = build_component_ref_1 (build_indirect_ref (instance_ptr,
- NULL_PTR),
- field, LOOKUP_COMPLAIN);
- if (ref == error_mark_node)
- return error_mark_node;
- return build_function_call (ref, parms);
- }
- }
- else if (TREE_CODE (ftype) == METHOD_TYPE)
- {
- error ("invalid call via pointer-to-member function");
- return error_mark_node;
- }
- else
- return NULL_TREE;
- }
- return NULL_TREE;
-}
-
-static tree
-find_scoped_type (type, inner_name, inner_types)
- tree type, inner_name, inner_types;
-{
- tree tags = CLASSTYPE_TAGS (type);
-
- while (tags)
- {
- /* The TREE_PURPOSE of an enum tag (which becomes a member of the
- enclosing class) is set to the name for the enum type. So, if
- inner_name is `bar', and we strike `baz' for `enum bar { baz }',
- then this test will be true. */
- if (TREE_PURPOSE (tags) == inner_name)
- {
- if (inner_types == NULL_TREE)
- return TYPE_MAIN_DECL (TREE_VALUE (tags));
- return resolve_scope_to_name (TREE_VALUE (tags), inner_types);
- }
- tags = TREE_CHAIN (tags);
- }
-
- /* Look for a TYPE_DECL. */
- for (tags = TYPE_FIELDS (type); tags; tags = TREE_CHAIN (tags))
- if (TREE_CODE (tags) == TYPE_DECL && DECL_NAME (tags) == inner_name)
- {
- /* Code by raeburn. */
- if (inner_types == NULL_TREE)
- return tags;
- return resolve_scope_to_name (TREE_TYPE (tags), inner_types);
- }
-
- return NULL_TREE;
-}
-
-/* Resolve an expression NAME1::NAME2::...::NAMEn to
- the name that names the above nested type. INNER_TYPES
- is a chain of nested type names (held together by SCOPE_REFs);
- OUTER_TYPE is the type we know to enclose INNER_TYPES.
- Returns NULL_TREE if there is an error. */
-
-tree
-resolve_scope_to_name (outer_type, inner_stuff)
- tree outer_type, inner_stuff;
-{
- register tree tmp;
- tree inner_name, inner_type;
-
- if (outer_type == NULL_TREE && current_class_type != NULL_TREE)
- {
- /* We first try to look for a nesting in our current class context,
- then try any enclosing classes. */
- tree type = current_class_type;
-
- while (type && (TREE_CODE (type) == RECORD_TYPE
- || TREE_CODE (type) == UNION_TYPE))
- {
- tree rval = resolve_scope_to_name (type, inner_stuff);
-
- if (rval != NULL_TREE)
- return rval;
- type = DECL_CONTEXT (TYPE_MAIN_DECL (type));
- }
- }
-
- if (TREE_CODE (inner_stuff) == SCOPE_REF)
- {
- inner_name = TREE_OPERAND (inner_stuff, 0);
- inner_type = TREE_OPERAND (inner_stuff, 1);
- }
- else
- {
- inner_name = inner_stuff;
- inner_type = NULL_TREE;
- }
-
- if (outer_type == NULL_TREE)
- {
- tree x;
- /* If we have something that's already a type by itself,
- use that. */
- if (IDENTIFIER_HAS_TYPE_VALUE (inner_name))
- {
- if (inner_type)
- return resolve_scope_to_name (IDENTIFIER_TYPE_VALUE (inner_name),
- inner_type);
- return inner_name;
- }
-
- x = lookup_name (inner_name, 0);
-
- if (x && TREE_CODE (x) == NAMESPACE_DECL)
- {
- x = lookup_namespace_name (x, inner_type);
- return x;
- }
- return NULL_TREE;
- }
-
- if (! IS_AGGR_TYPE (outer_type))
- return NULL_TREE;
-
- /* Look for member classes or enums. */
- tmp = find_scoped_type (outer_type, inner_name, inner_type);
-
- /* If it's not a type in this class, then go down into the
- base classes and search there. */
- if (! tmp && TYPE_BINFO (outer_type))
- {
- tree binfos = TYPE_BINFO_BASETYPES (outer_type);
- int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0;
-
- for (i = 0; i < n_baselinks; i++)
- {
- tree base_binfo = TREE_VEC_ELT (binfos, i);
- tmp = resolve_scope_to_name (BINFO_TYPE (base_binfo), inner_stuff);
- if (tmp)
- return tmp;
- }
- tmp = NULL_TREE;
- }
-
- return tmp;
-}
-
-/* Build a method call of the form `EXP->SCOPES::NAME (PARMS)'.
- This is how virtual function calls are avoided. */
-
-tree
-build_scoped_method_call (exp, basetype, name, parms)
- tree exp, basetype, name, parms;
-{
- /* Because this syntactic form does not allow
- a pointer to a base class to be `stolen',
- we need not protect the derived->base conversion
- that happens here.
-
- @@ But we do have to check access privileges later. */
- tree binfo, decl;
- tree type = TREE_TYPE (exp);
-
- if (type == error_mark_node
- || basetype == error_mark_node)
- return error_mark_node;
-
- if (processing_template_decl)
- {
- if (TREE_CODE (name) == BIT_NOT_EXPR)
- {
- tree type = get_aggr_from_typedef (TREE_OPERAND (name, 0), 0);
- if (type)
- name = build_min_nt (BIT_NOT_EXPR, type);
- }
- name = build_min_nt (SCOPE_REF, basetype, name);
- return build_min_nt (METHOD_CALL_EXPR, name, exp, parms, NULL_TREE);
- }
-
- if (TREE_CODE (type) == REFERENCE_TYPE)
- type = TREE_TYPE (type);
-
- if (TREE_CODE (basetype) == TREE_VEC)
- {
- binfo = basetype;
- basetype = BINFO_TYPE (binfo);
- }
- else
- binfo = NULL_TREE;
-
- /* Destructors can be "called" for simple types; see 5.2.4 and 12.4 Note
- that explicit ~int is caught in the parser; this deals with typedefs
- and template parms. */
- if (TREE_CODE (name) == BIT_NOT_EXPR && ! IS_AGGR_TYPE (basetype))
- {
- if (type != basetype)
- cp_error ("type of `%E' does not match destructor type `%T' (type was `%T')",
- exp, basetype, type);
- name = TREE_OPERAND (name, 0);
- if (basetype != name && basetype != get_type_value (name))
- cp_error ("qualified type `%T' does not match destructor name `~%T'",
- basetype, name);
- return cp_convert (void_type_node, exp);
- }
-
- if (! is_aggr_type (basetype, 1))
- return error_mark_node;
-
- if (! IS_AGGR_TYPE (type))
- {
- cp_error ("base object `%E' of scoped method call is of non-aggregate type `%T'",
- exp, type);
- return error_mark_node;
- }
-
- if (! binfo)
- {
- binfo = get_binfo (basetype, type, 1);
- if (binfo == error_mark_node)
- return error_mark_node;
- if (! binfo)
- error_not_base_type (basetype, type);
- }
-
- if (binfo)
- {
- if (TREE_CODE (exp) == INDIRECT_REF)
- decl = build_indirect_ref
- (convert_pointer_to_real
- (binfo, build_unary_op (ADDR_EXPR, exp, 0)), NULL_PTR);
- else
- decl = build_scoped_ref (exp, basetype);
-
- /* Call to a destructor. */
- if (TREE_CODE (name) == BIT_NOT_EXPR)
- {
- /* Explicit call to destructor. */
- name = TREE_OPERAND (name, 0);
- if (! (name == TYPE_MAIN_VARIANT (TREE_TYPE (decl))
- || name == constructor_name (TREE_TYPE (decl))
- || TREE_TYPE (decl) == get_type_value (name)))
- {
- cp_error
- ("qualified type `%T' does not match destructor name `~%T'",
- TREE_TYPE (decl), name);
- return error_mark_node;
- }
- if (! TYPE_HAS_DESTRUCTOR (TREE_TYPE (decl)))
- return cp_convert (void_type_node, exp);
-
- return build_delete (TREE_TYPE (decl), decl, integer_two_node,
- LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR,
- 0);
- }
-
- /* Call to a method. */
- return build_method_call (decl, name, parms, binfo,
- LOOKUP_NORMAL|LOOKUP_NONVIRTUAL);
- }
- return error_mark_node;
-}
-
-static void
-print_candidates (candidates)
- tree candidates;
-{
- cp_error_at ("candidates are: %D", TREE_VALUE (candidates));
- candidates = TREE_CHAIN (candidates);
-
- while (candidates)
- {
- cp_error_at (" %D", TREE_VALUE (candidates));
- candidates = TREE_CHAIN (candidates);
- }
-}
-
-static void
-print_n_candidates (candidates, n)
- struct candidate *candidates;
- int n;
-{
- int i;
-
- cp_error_at ("candidates are: %D", candidates[0].function);
- for (i = 1; i < n; i++)
- cp_error_at (" %D", candidates[i].function);
-}
-
-/* We want the address of a function or method. We avoid creating a
- pointer-to-member function. */
-
-tree
-build_addr_func (function)
- tree function;
-{
- tree type = TREE_TYPE (function);
-
- /* We have to do these by hand to avoid real pointer to member
- functions. */
- if (TREE_CODE (type) == METHOD_TYPE)
- {
- tree addr;
-
- type = build_pointer_type (type);
-
- if (mark_addressable (function) == 0)
- return error_mark_node;
-
- addr = build1 (ADDR_EXPR, type, function);
-
- /* Address of a static or external variable or function counts
- as a constant */
- if (staticp (function))
- TREE_CONSTANT (addr) = 1;
-
- function = addr;
- }
- else
- function = default_conversion (function);
-
- return function;
-}
-
-/* Build a CALL_EXPR, we can handle FUNCTION_TYPEs, METHOD_TYPEs, or
- POINTER_TYPE to those. Note, pointer to member function types
- (TYPE_PTRMEMFUNC_P) must be handled by our callers. */
-
-tree
-build_call (function, result_type, parms)
- tree function, result_type, parms;
-{
- int is_constructor = 0;
-
- function = build_addr_func (function);
-
- if (TYPE_PTRMEMFUNC_P (TREE_TYPE (function)))
- {
- sorry ("unable to call pointer to member function here");
- return error_mark_node;
- }
-
- if (TREE_CODE (function) == ADDR_EXPR
- && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL
- && DECL_CONSTRUCTOR_P (TREE_OPERAND (function, 0)))
- is_constructor = 1;
-
- function = build_nt (CALL_EXPR, function, parms, NULL_TREE);
- TREE_HAS_CONSTRUCTOR (function) = is_constructor;
- TREE_TYPE (function) = result_type;
- TREE_SIDE_EFFECTS (function) = 1;
-
- return function;
-}
-
-static tree
-default_parm_conversions (parms, last)
- tree parms, *last;
-{
- tree parm, parmtypes = NULL_TREE;
-
- *last = NULL_TREE;
-
- for (parm = parms; parm; parm = TREE_CHAIN (parm))
- {
- tree t = TREE_TYPE (TREE_VALUE (parm));
-
- if (TREE_CODE (t) == OFFSET_TYPE
- || TREE_CODE (t) == METHOD_TYPE
- || TREE_CODE (t) == FUNCTION_TYPE)
- {
- TREE_VALUE (parm) = default_conversion (TREE_VALUE (parm));
- t = TREE_TYPE (TREE_VALUE (parm));
- }
-
- if (t == error_mark_node)
- return error_mark_node;
-
- *last = build_tree_list (NULL_TREE, t);
- parmtypes = chainon (parmtypes, *last);
- }
-
- return parmtypes;
-}
-
-
-/* Build something of the form ptr->method (args)
- or object.method (args). This can also build
- calls to constructors, and find friends.
-
- Member functions always take their class variable
- as a pointer.
-
- INSTANCE is a class instance.
-
- NAME is the name of the method desired, usually an IDENTIFIER_NODE.
-
- PARMS help to figure out what that NAME really refers to.
-
- BASETYPE_PATH, if non-NULL, contains a chain from the type of INSTANCE
- down to the real instance type to use for access checking. We need this
- information to get protected accesses correct. This parameter is used
- by build_member_call.
-
- FLAGS is the logical disjunction of zero or more LOOKUP_
- flags. See cp-tree.h for more info.
-
- If this is all OK, calls build_function_call with the resolved
- member function.
-
- This function must also handle being called to perform
- initialization, promotion/coercion of arguments, and
- instantiation of default parameters.
-
- Note that NAME may refer to an instance variable name. If
- `operator()()' is defined for the type of that field, then we return
- that result. */
-
-tree
-build_method_call (instance, name, parms, basetype_path, flags)
- tree instance, name, parms, basetype_path;
- int flags;
-{
- register tree function, fntype, value_type;
- register tree basetype, save_basetype;
- register tree baselink, result, parmtypes;
- tree last;
- int pass;
- tree access = access_public_node;
- tree orig_basetype = basetype_path ? BINFO_TYPE (basetype_path) : NULL_TREE;
-
- /* Range of cases for vtable optimization. */
- enum vtable_needs { not_needed, maybe_needed, unneeded, needed };
- enum vtable_needs need_vtbl = not_needed;
-
- char *name_kind;
- tree save_name = name;
- int ever_seen = 0;
- tree instance_ptr = NULL_TREE;
- int all_virtual = flag_all_virtual;
- int static_call_context = 0;
- tree found_fns = NULL_TREE;
-
- /* Keep track of `const' and `volatile' objects. */
- int constp, volatilep;
-
-#ifdef GATHER_STATISTICS
- n_build_method_call++;
-#endif
-
- if (instance == error_mark_node
- || name == error_mark_node
- || parms == error_mark_node
- || (instance != NULL_TREE && TREE_TYPE (instance) == error_mark_node))
- return error_mark_node;
-
- if (processing_template_decl)
- {
- if (TREE_CODE (name) == BIT_NOT_EXPR)
- {
- tree type = get_aggr_from_typedef (TREE_OPERAND (name, 0), 1);
- name = build_min_nt (BIT_NOT_EXPR, type);
- }
-
- return build_min_nt (METHOD_CALL_EXPR, name, instance, parms, NULL_TREE);
- }
-
- /* This is the logic that magically deletes the second argument to
- operator delete, if it is not needed. */
- if (name == ansi_opname[(int) DELETE_EXPR] && list_length (parms)==2)
- {
- tree save_last = TREE_CHAIN (parms);
- tree result;
- /* get rid of unneeded argument */
- TREE_CHAIN (parms) = NULL_TREE;
- result = build_method_call (instance, name, parms, basetype_path,
- (LOOKUP_SPECULATIVELY|flags)
- &~LOOKUP_COMPLAIN);
- /* If it finds a match, return it. */
- if (result)
- return build_method_call (instance, name, parms, basetype_path, flags);
- /* If it doesn't work, two argument delete must work */
- TREE_CHAIN (parms) = save_last;
- }
- /* We already know whether it's needed or not for vec delete. */
- else if (name == ansi_opname[(int) VEC_DELETE_EXPR]
- && TYPE_LANG_SPECIFIC (TREE_TYPE (instance))
- && ! TYPE_VEC_DELETE_TAKES_SIZE (TREE_TYPE (instance)))
- TREE_CHAIN (parms) = NULL_TREE;
-
- if (TREE_CODE (name) == BIT_NOT_EXPR)
- {
- flags |= LOOKUP_DESTRUCTOR;
- name = TREE_OPERAND (name, 0);
- if (parms)
- error ("destructors take no parameters");
- basetype = TREE_TYPE (instance);
- if (TREE_CODE (basetype) == REFERENCE_TYPE)
- basetype = TREE_TYPE (basetype);
- if (! (name == basetype
- || (IS_AGGR_TYPE (basetype)
- && name == constructor_name (basetype))
- || basetype == get_type_value (name)))
- {
- cp_error ("destructor name `~%D' does not match type `%T' of expression",
- name, basetype);
- return cp_convert (void_type_node, instance);
- }
-
- if (! TYPE_HAS_DESTRUCTOR (complete_type (basetype)))
- return cp_convert (void_type_node, instance);
- instance = default_conversion (instance);
- instance_ptr = build_unary_op (ADDR_EXPR, instance, 0);
- return build_delete (build_pointer_type (basetype),
- instance_ptr, integer_two_node,
- LOOKUP_NORMAL|LOOKUP_DESTRUCTOR, 0);
- }
-
- if (flag_ansi_overloading)
- return build_new_method_call (instance, name, parms, basetype_path, flags);
-
- {
- char *xref_name;
-
- /* Initialize name for error reporting. */
- if (IDENTIFIER_OPNAME_P (name) && ! IDENTIFIER_TYPENAME_P (name))
- {
- char *p = operator_name_string (name);
- xref_name = (char *)alloca (strlen (p) + 10);
- sprintf (xref_name, "operator %s", p);
- }
- else if (TREE_CODE (name) == SCOPE_REF)
- xref_name = IDENTIFIER_POINTER (TREE_OPERAND (name, 1));
- else
- xref_name = IDENTIFIER_POINTER (name);
-
- GNU_xref_call (current_function_decl, xref_name);
- }
-
- if (instance == NULL_TREE)
- {
- basetype = NULL_TREE;
- /* Check cases where this is really a call to raise
- an exception. */
- if (current_class_type && TREE_CODE (name) == IDENTIFIER_NODE)
- {
- basetype = purpose_member (name, CLASSTYPE_TAGS (current_class_type));
- if (basetype)
- basetype = TREE_VALUE (basetype);
- }
- else if (TREE_CODE (name) == SCOPE_REF
- && TREE_CODE (TREE_OPERAND (name, 0)) == IDENTIFIER_NODE)
- {
- if (! is_aggr_typedef (TREE_OPERAND (name, 0), 1))
- return error_mark_node;
- basetype = purpose_member (TREE_OPERAND (name, 1),
- CLASSTYPE_TAGS (IDENTIFIER_TYPE_VALUE (TREE_OPERAND (name, 0))));
- if (basetype)
- basetype = TREE_VALUE (basetype);
- }
-
- if (basetype != NULL_TREE)
- ;
- /* call to a constructor... */
- else if (basetype_path)
- {
- basetype = BINFO_TYPE (basetype_path);
- if (name == TYPE_IDENTIFIER (basetype))
- name = ctor_identifier;
- }
- else if (IDENTIFIER_HAS_TYPE_VALUE (name))
- {
- basetype = IDENTIFIER_TYPE_VALUE (name);
- name = ctor_identifier;
- }
- else
- {
- tree typedef_name = lookup_name (name, 1);
- if (typedef_name && TREE_CODE (typedef_name) == TYPE_DECL)
- {
- /* Canonicalize the typedef name. */
- basetype = TREE_TYPE (typedef_name);
- name = ctor_identifier;
- }
- else
- {
- cp_error ("no constructor named `%T' in scope",
- name);
- return error_mark_node;
- }
- }
-
- if (! IS_AGGR_TYPE (basetype))
- {
- non_aggr_error:
- if ((flags & LOOKUP_COMPLAIN) && basetype != error_mark_node)
- cp_error ("request for member `%D' in `%E', which is of non-aggregate type `%T'",
- name, instance, basetype);
-
- return error_mark_node;
- }
- }
- else if (instance == current_class_ref || instance == current_class_ptr)
- {
- /* When doing initialization, we side-effect the TREE_TYPE of
- current_class_ref, hence we cannot set up BASETYPE from CURRENT_CLASS_TYPE. */
- basetype = TREE_TYPE (current_class_ref);
-
- /* Anything manifestly `this' in constructors and destructors
- has a known type, so virtual function tables are not needed. */
- if (TYPE_VIRTUAL_P (basetype)
- && !(flags & LOOKUP_NONVIRTUAL))
- need_vtbl = (dtor_label || ctor_label)
- ? unneeded : maybe_needed;
-
- /* If `this' is a signature pointer and `name' is not a constructor,
- we are calling a signature member function. In that case, set the
- `basetype' to the signature type and dereference the `optr' field. */
- if (IS_SIGNATURE_POINTER (basetype)
- && TYPE_IDENTIFIER (basetype) != name)
- {
- basetype = SIGNATURE_TYPE (basetype);
- instance_ptr = instance;
- basetype_path = TYPE_BINFO (basetype);
- }
- else
- {
- instance = current_class_ref;
- instance_ptr = current_class_ptr;
- basetype_path = TYPE_BINFO (current_class_type);
- }
- result = build_field_call (basetype_path, instance_ptr, name, parms);
-
- if (result)
- return result;
- }
- else if (TREE_CODE (instance) == RESULT_DECL)
- {
- basetype = TREE_TYPE (instance);
- /* Should we ever have to make a virtual function reference
- from a RESULT_DECL, know that it must be of fixed type
- within the scope of this function. */
- if (!(flags & LOOKUP_NONVIRTUAL) && TYPE_VIRTUAL_P (basetype))
- need_vtbl = maybe_needed;
- instance_ptr = build1 (ADDR_EXPR, build_pointer_type (basetype), instance);
- }
- else
- {
- /* The MAIN_VARIANT of the type that `instance_ptr' winds up being. */
- tree inst_ptr_basetype;
-
- static_call_context
- = (TREE_CODE (instance) == INDIRECT_REF
- && TREE_CODE (TREE_OPERAND (instance, 0)) == NOP_EXPR
- && TREE_OPERAND (TREE_OPERAND (instance, 0), 0) == error_mark_node);
-
- if (TREE_CODE (instance) == OFFSET_REF)
- instance = resolve_offset_ref (instance);
-
- /* the base type of an instance variable is pointer to class */
- basetype = TREE_TYPE (instance);
-
- if (TREE_CODE (basetype) == REFERENCE_TYPE)
- {
- basetype = TREE_TYPE (basetype);
- if (! IS_AGGR_TYPE (basetype))
- goto non_aggr_error;
- /* Call to convert not needed because we are remaining
- within the same type. */
- instance_ptr = build1 (NOP_EXPR, build_pointer_type (basetype),
- instance);
- inst_ptr_basetype = TYPE_MAIN_VARIANT (basetype);
- }
- else
- {
- if (! IS_AGGR_TYPE (basetype)
- && ! (TYPE_LANG_SPECIFIC (basetype)
- && (IS_SIGNATURE_POINTER (basetype)
- || IS_SIGNATURE_REFERENCE (basetype))))
- goto non_aggr_error;
-
- /* If `instance' is a signature pointer/reference and `name' is
- not a constructor, we are calling a signature member function.
- In that case set the `basetype' to the signature type. */
- if ((IS_SIGNATURE_POINTER (basetype)
- || IS_SIGNATURE_REFERENCE (basetype))
- && TYPE_IDENTIFIER (basetype) != name)
- basetype = SIGNATURE_TYPE (basetype);
-
- basetype = complete_type (basetype);
-
- if ((IS_SIGNATURE (basetype)
- && (instance_ptr = instance))
- || (lvalue_p (instance)
- && (instance_ptr = build_unary_op (ADDR_EXPR, instance, 0)))
- || (instance_ptr = unary_complex_lvalue (ADDR_EXPR, instance)))
- {
- if (instance_ptr == error_mark_node)
- return error_mark_node;
- }
- else if (TREE_CODE (instance) == NOP_EXPR
- || TREE_CODE (instance) == CONSTRUCTOR)
- {
- /* A cast is not an lvalue. Initialize a fresh temp
- with the value we are casting from, and proceed with
- that temporary. We can't cast to a reference type,
- so that simplifies the initialization to something
- we can manage. */
- tree temp = get_temp_name (TREE_TYPE (instance), 0);
- if (IS_AGGR_TYPE (TREE_TYPE (instance)))
- expand_aggr_init (temp, instance, 0, flags);
- else
- {
- store_init_value (temp, instance);
- expand_decl_init (temp);
- }
- instance = temp;
- instance_ptr = build_unary_op (ADDR_EXPR, instance, 0);
- }
- else
- {
- if (TREE_CODE (instance) != CALL_EXPR)
- my_friendly_abort (125);
- if (TYPE_NEEDS_CONSTRUCTING (basetype))
- instance = build_cplus_new (basetype, instance);
- else
- {
- instance = get_temp_name (basetype, 0);
- TREE_ADDRESSABLE (instance) = 1;
- }
- instance_ptr = build_unary_op (ADDR_EXPR, instance, 0);
- }
- /* @@ Should we call comp_target_types here? */
- if (IS_SIGNATURE (basetype))
- inst_ptr_basetype = basetype;
- else
- inst_ptr_basetype = TREE_TYPE (TREE_TYPE (instance_ptr));
- if (TYPE_MAIN_VARIANT (basetype) == TYPE_MAIN_VARIANT (inst_ptr_basetype))
- basetype = inst_ptr_basetype;
- else
- {
- instance_ptr = cp_convert (build_pointer_type (basetype), instance_ptr);
- if (instance_ptr == error_mark_node)
- return error_mark_node;
- }
- }
-
- /* After converting `instance_ptr' above, `inst_ptr_basetype' was
- not updated, so we use `basetype' instead. */
- if (basetype_path == NULL_TREE
- && IS_SIGNATURE (basetype))
- basetype_path = TYPE_BINFO (basetype);
- else if (basetype_path == NULL_TREE
- || (BINFO_TYPE (basetype_path)
- != TYPE_MAIN_VARIANT (inst_ptr_basetype)))
- basetype_path = TYPE_BINFO (inst_ptr_basetype);
-
- result = build_field_call (basetype_path, instance_ptr, name, parms);
- if (result)
- return result;
-
- if (!(flags & LOOKUP_NONVIRTUAL) && TYPE_VIRTUAL_P (basetype))
- {
- if (TREE_SIDE_EFFECTS (instance_ptr))
- {
- /* This action is needed because the instance is needed
- for providing the base of the virtual function table.
- Without using a SAVE_EXPR, the function we are building
- may be called twice, or side effects on the instance
- variable (such as a post-increment), may happen twice. */
- instance_ptr = save_expr (instance_ptr);
- instance = build_indirect_ref (instance_ptr, NULL_PTR);
- }
- else if (TREE_CODE (TREE_TYPE (instance)) == POINTER_TYPE)
- {
- /* This happens when called for operator new (). */
- instance = build_indirect_ref (instance, NULL_PTR);
- }
-
- need_vtbl = maybe_needed;
- }
- }
-
- if (save_name == ctor_identifier)
- save_name = TYPE_IDENTIFIER (basetype);
-
- if (TYPE_SIZE (complete_type (basetype)) == 0)
- {
- /* This is worth complaining about, I think. */
- cp_error ("cannot lookup method in incomplete type `%T'", basetype);
- return error_mark_node;
- }
+ if (! IS_AGGR_TYPE (outer_type))
+ return NULL_TREE;
- save_basetype = TYPE_MAIN_VARIANT (basetype);
+ /* Look for member classes or enums. */
+ tmp = find_scoped_type (outer_type, inner_name, inner_type);
- parmtypes = default_parm_conversions (parms, &last);
- if (parmtypes == error_mark_node)
+ /* If it's not a type in this class, then go down into the
+ base classes and search there. */
+ if (! tmp && TYPE_BINFO (outer_type))
{
- return error_mark_node;
- }
+ tree binfos = TYPE_BINFO_BASETYPES (outer_type);
+ int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0;
- if (instance && IS_SIGNATURE (basetype))
- {
- /* @@ Should this be the constp/volatilep flags for the optr field
- of the signature pointer? */
- constp = TYPE_READONLY (basetype);
- volatilep = TYPE_VOLATILE (basetype);
- parms = expr_tree_cons (NULL_TREE, instance_ptr, parms);
- }
- else if (instance)
- {
- /* TREE_READONLY (instance) fails for references. */
- constp = TYPE_READONLY (TREE_TYPE (TREE_TYPE (instance_ptr)));
- volatilep = TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (instance_ptr)));
- parms = expr_tree_cons (NULL_TREE, instance_ptr, parms);
- }
- else
- {
- /* Raw constructors are always in charge. */
- if (TYPE_USES_VIRTUAL_BASECLASSES (basetype)
- && ! (flags & LOOKUP_HAS_IN_CHARGE))
+ for (i = 0; i < n_baselinks; i++)
{
- flags |= LOOKUP_HAS_IN_CHARGE;
- parms = expr_tree_cons (NULL_TREE, integer_one_node, parms);
- parmtypes = scratch_tree_cons (NULL_TREE, integer_type_node, parmtypes);
+ tree base_binfo = TREE_VEC_ELT (binfos, i);
+ tmp = resolve_scope_to_name (BINFO_TYPE (base_binfo), inner_stuff);
+ if (tmp)
+ return tmp;
}
-
- constp = 0;
- volatilep = 0;
- instance_ptr = build_int_2 (0, 0);
- TREE_TYPE (instance_ptr) = build_pointer_type (basetype);
- parms = expr_tree_cons (NULL_TREE, instance_ptr, parms);
+ tmp = NULL_TREE;
}
- parmtypes = scratch_tree_cons (NULL_TREE, TREE_TYPE (instance_ptr), parmtypes);
+ return tmp;
+}
- if (last == NULL_TREE)
- last = parmtypes;
+/* Build a method call of the form `EXP->SCOPES::NAME (PARMS)'.
+ This is how virtual function calls are avoided. */
- /* Look up function name in the structure type definition. */
+tree
+build_scoped_method_call (exp, basetype, name, parms)
+ tree exp, basetype, name, parms;
+{
+ /* Because this syntactic form does not allow
+ a pointer to a base class to be `stolen',
+ we need not protect the derived->base conversion
+ that happens here.
+
+ @@ But we do have to check access privileges later. */
+ tree binfo, decl;
+ tree type = TREE_TYPE (exp);
- /* FIXME Axe most of this now? */
- if ((IDENTIFIER_HAS_TYPE_VALUE (name)
- && ! IDENTIFIER_OPNAME_P (name)
- && IS_AGGR_TYPE (IDENTIFIER_TYPE_VALUE (name)))
- || name == constructor_name (basetype)
- || name == ctor_identifier)
- {
- tree tmp = NULL_TREE;
- if (IDENTIFIER_TYPE_VALUE (name) == basetype
- || name == constructor_name (basetype)
- || name == ctor_identifier)
- tmp = TYPE_BINFO (basetype);
- else
- tmp = get_binfo (IDENTIFIER_TYPE_VALUE (name), basetype, 0);
-
- if (tmp != NULL_TREE)
- {
- name_kind = "constructor";
-
- if (TYPE_USES_VIRTUAL_BASECLASSES (basetype)
- && ! (flags & LOOKUP_HAS_IN_CHARGE))
- {
- /* Constructors called for initialization
- only are never in charge. */
- tree tmplist;
-
- flags |= LOOKUP_HAS_IN_CHARGE;
- tmplist = expr_tree_cons (NULL_TREE, integer_zero_node,
- TREE_CHAIN (parms));
- TREE_CHAIN (parms) = tmplist;
- tmplist = scratch_tree_cons (NULL_TREE, integer_type_node, TREE_CHAIN (parmtypes));
- TREE_CHAIN (parmtypes) = tmplist;
- }
- basetype = BINFO_TYPE (tmp);
- }
- else
- name_kind = "method";
- }
- else
- name_kind = "method";
-
- if (basetype_path == NULL_TREE
- || BINFO_TYPE (basetype_path) != TYPE_MAIN_VARIANT (basetype))
- basetype_path = TYPE_BINFO (basetype);
- result = lookup_fnfields (basetype_path, name,
- (flags & LOOKUP_COMPLAIN));
- if (result == error_mark_node)
+ if (type == error_mark_node
+ || basetype == error_mark_node)
return error_mark_node;
- for (pass = 0; pass < 2; pass++)
- {
- struct candidate *candidates = 0;
- struct candidate *cp = 0;
- int len = 0;
- unsigned best = 1;
-
- baselink = result;
-
- if (pass > 0)
- {
- candidates
- = (struct candidate *) alloca ((ever_seen+1)
- * sizeof (struct candidate));
- bzero ((char *) candidates, (ever_seen + 1) * sizeof (struct candidate));
- cp = candidates;
- len = list_length (parms);
- ever_seen = 0;
-
- /* First see if a global function has a shot at it. */
- if (flags & LOOKUP_GLOBAL)
- {
- tree friend_parms;
- tree parm = instance_ptr;
-
- if (TREE_CODE (TREE_TYPE (parm)) == REFERENCE_TYPE)
- parm = convert_from_reference (parm);
- else if (TREE_CODE (TREE_TYPE (parm)) == POINTER_TYPE)
- parm = build_indirect_ref (parm, "friendifying parms (compiler error)");
- else
- my_friendly_abort (167);
-
- friend_parms = expr_tree_cons (NULL_TREE, parm, TREE_CHAIN (parms));
-
- cp->h_len = len;
- cp->harshness = (struct harshness_code *)
- alloca ((len + 1) * sizeof (struct harshness_code));
-
- result = build_overload_call_real (name, friend_parms, 0, cp, 1);
-
- /* If it turns out to be the one we were actually looking for
- (it was probably a friend function), the return the
- good result. */
- if (TREE_CODE (result) == CALL_EXPR)
- return result;
-
- while ((cp->h.code & EVIL_CODE) == 0)
- {
- /* non-standard uses: set the field to 0 to indicate
- we are using a non-member function. */
- cp->u.field = 0;
- if (cp->harshness[len].distance == 0
- && cp->h.code < best)
- best = cp->h.code;
- cp += 1;
- }
- }
- }
-
- if (baselink)
- {
- /* We have a hit (of sorts). If the parameter list is
- "error_mark_node", or some variant thereof, it won't
- match any methods. Since we have verified that the is
- some method vaguely matching this one (in name at least),
- silently return.
-
- Don't stop for friends, however. */
- basetype_path = TREE_PURPOSE (baselink);
-
- function = TREE_VALUE (baselink);
- if (TREE_CODE (basetype_path) == TREE_LIST)
- basetype_path = TREE_VALUE (basetype_path);
- basetype = BINFO_TYPE (basetype_path);
-
- for (; function; function = DECL_CHAIN (function))
- {
-#ifdef GATHER_STATISTICS
- n_inner_fields_searched++;
-#endif
- ever_seen++;
- if (pass > 0)
- found_fns = scratch_tree_cons (NULL_TREE, function, found_fns);
-
- /* Not looking for friends here. */
- if (TREE_CODE (TREE_TYPE (function)) == FUNCTION_TYPE
- && ! DECL_STATIC_FUNCTION_P (function))
- continue;
-
- if (pass > 0)
- {
- tree these_parms = parms;
-
-#ifdef GATHER_STATISTICS
- n_inner_fields_searched++;
-#endif
- cp->h_len = len;
- cp->harshness = (struct harshness_code *)
- alloca ((len + 1) * sizeof (struct harshness_code));
-
- if (DECL_STATIC_FUNCTION_P (function))
- these_parms = TREE_CHAIN (these_parms);
- compute_conversion_costs (function, these_parms, cp, len);
-
- if ((cp->h.code & EVIL_CODE) == 0)
- {
- cp->u.field = function;
- cp->function = function;
- cp->basetypes = basetype_path;
-
- /* Don't allow non-converting constructors to convert. */
- if (flags & LOOKUP_ONLYCONVERTING
- && DECL_LANG_SPECIFIC (function)
- && DECL_NONCONVERTING_P (function))
- continue;
-
- /* No "two-level" conversions. */
- if (flags & LOOKUP_NO_CONVERSION
- && (cp->h.code & USER_CODE))
- continue;
-
- cp++;
- }
- }
- }
- }
-
- if (pass == 0)
- {
- tree igv = lookup_name_nonclass (name);
-
- /* No exact match could be found. Now try to find match
- using default conversions. */
- if ((flags & LOOKUP_GLOBAL) && igv)
- {
- if (TREE_CODE (igv) == FUNCTION_DECL)
- ever_seen += 1;
- else if (TREE_CODE (igv) == TREE_LIST)
- ever_seen += count_functions (igv);
- }
-
- if (ever_seen == 0)
- {
- if ((flags & (LOOKUP_SPECULATIVELY|LOOKUP_COMPLAIN))
- == LOOKUP_SPECULATIVELY)
- return NULL_TREE;
-
- TREE_CHAIN (last) = void_list_node;
- if (flags & LOOKUP_GLOBAL)
- cp_error ("no global or member function `%D(%A)' defined",
- save_name, parmtypes);
- else
- cp_error ("no member function `%T::%D(%A)' defined",
- save_basetype, save_name, TREE_CHAIN (parmtypes));
- return error_mark_node;
- }
- continue;
- }
-
- if (cp - candidates != 0)
- {
- /* Rank from worst to best. Then cp will point to best one.
- Private fields have their bits flipped. For unsigned
- numbers, this should make them look very large.
- If the best alternate has a (signed) negative value,
- then all we ever saw were private members. */
- if (cp - candidates > 1)
- {
- int n_candidates = cp - candidates;
- extern int warn_synth;
- TREE_VALUE (parms) = instance_ptr;
- cp = ideal_candidate (candidates, n_candidates, len);
- if (cp == (struct candidate *)0)
- {
- if (flags & LOOKUP_COMPLAIN)
- {
- TREE_CHAIN (last) = void_list_node;
- cp_error ("call of overloaded %s `%D(%A)' is ambiguous",
- name_kind, save_name, TREE_CHAIN (parmtypes));
- print_n_candidates (candidates, n_candidates);
- }
- return error_mark_node;
- }
- if (cp->h.code & EVIL_CODE)
- return error_mark_node;
- if (warn_synth
- && DECL_NAME (cp->function) == ansi_opname[MODIFY_EXPR]
- && DECL_ARTIFICIAL (cp->function)
- && n_candidates == 2)
- {
- cp_warning ("using synthesized `%#D' for copy assignment",
- cp->function);
- cp_warning_at (" where cfront would use `%#D'",
- candidates->function);
- }
- }
- else if (cp[-1].h.code & EVIL_CODE)
- {
- if (flags & LOOKUP_COMPLAIN)
- cp_error ("ambiguous type conversion requested for %s `%D'",
- name_kind, save_name);
- return error_mark_node;
- }
- else
- cp--;
-
- /* The global function was the best, so use it. */
- if (cp->u.field == 0)
- {
- /* We must convert the instance pointer into a reference type.
- Global overloaded functions can only either take
- aggregate objects (which come for free from references)
- or reference data types anyway. */
- TREE_VALUE (parms) = copy_node (instance_ptr);
- TREE_TYPE (TREE_VALUE (parms)) = build_reference_type (TREE_TYPE (TREE_TYPE (instance_ptr)));
- return build_function_call (cp->function, parms);
- }
-
- function = cp->function;
- basetype_path = cp->basetypes;
- if (! DECL_STATIC_FUNCTION_P (function))
- TREE_VALUE (parms) = cp->arg;
- goto found_and_maybe_warn;
- }
-
- if (flags & (LOOKUP_COMPLAIN|LOOKUP_SPECULATIVELY))
- {
- if ((flags & (LOOKUP_SPECULATIVELY|LOOKUP_COMPLAIN))
- == LOOKUP_SPECULATIVELY)
- return NULL_TREE;
-
- if (DECL_STATIC_FUNCTION_P (cp->function))
- parms = TREE_CHAIN (parms);
- if (ever_seen)
- {
- if (flags & LOOKUP_SPECULATIVELY)
- return NULL_TREE;
- if (static_call_context
- && TREE_CODE (TREE_TYPE (cp->function)) == METHOD_TYPE)
- cp_error ("object missing in call to `%D'", cp->function);
- else if (ever_seen > 1)
- {
- TREE_CHAIN (last) = void_list_node;
- cp_error ("no matching function for call to `%T::%D (%A)%V'",
- TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (instance_ptr))),
- save_name, TREE_CHAIN (parmtypes),
- TREE_TYPE (TREE_TYPE (instance_ptr)));
- TREE_CHAIN (last) = NULL_TREE;
- print_candidates (found_fns);
- }
- else
- report_type_mismatch (cp, parms, name_kind);
- return error_mark_node;
- }
-
- if ((flags & (LOOKUP_SPECULATIVELY|LOOKUP_COMPLAIN))
- == LOOKUP_COMPLAIN)
- {
- cp_error ("%T has no method named %D", save_basetype, save_name);
- return error_mark_node;
- }
- return NULL_TREE;
- }
- continue;
-
- found_and_maybe_warn:
- if ((cp->harshness[0].code & CONST_CODE)
- /* 12.1p2: Constructors can be called for const objects. */
- && ! DECL_CONSTRUCTOR_P (cp->function))
- {
- if (flags & LOOKUP_COMPLAIN)
- {
- cp_error_at ("non-const member function `%D'", cp->function);
- error ("called for const object at this point in file");
- }
- /* Not good enough for a match. */
- else
- return error_mark_node;
- }
- goto found;
- }
- /* Silently return error_mark_node. */
- return error_mark_node;
-
- found:
- if (flags & LOOKUP_PROTECT)
- access = compute_access (basetype_path, function);
-
- if (access == access_private_node)
- {
- if (flags & LOOKUP_COMPLAIN)
- {
- cp_error_at ("%s `%+#D' is %s", name_kind, function,
- TREE_PRIVATE (function) ? "private"
- : "from private base class");
- error ("within this context");
- }
- return error_mark_node;
- }
- else if (access == access_protected_node)
- {
- if (flags & LOOKUP_COMPLAIN)
- {
- cp_error_at ("%s `%+#D' %s", name_kind, function,
- TREE_PROTECTED (function) ? "is protected"
- : "has protected accessibility");
- error ("within this context");
- }
- return error_mark_node;
- }
-
- /* From here on down, BASETYPE is the type that INSTANCE_PTR's
- type (if it exists) is a pointer to. */
-
- if (DECL_ABSTRACT_VIRTUAL_P (function)
- && instance == current_class_ref
- && DECL_CONSTRUCTOR_P (current_function_decl)
- && ! (flags & LOOKUP_NONVIRTUAL)
- && value_member (function, get_abstract_virtuals (basetype)))
- cp_error ("abstract virtual `%#D' called from constructor", function);
-
- if (IS_SIGNATURE (basetype))
+ if (processing_template_decl)
{
- if (static_call_context)
+ if (TREE_CODE (name) == BIT_NOT_EXPR)
{
- cp_error ("cannot call signature member function `%T::%D' without signature pointer/reference",
- basetype, save_name);
- return error_mark_node;
+ tree type = get_aggr_from_typedef (TREE_OPERAND (name, 0), 0);
+ if (type)
+ name = build_min_nt (BIT_NOT_EXPR, type);
}
- return build_signature_method_call (function, parms);
+ name = build_min_nt (SCOPE_REF, basetype, name);
+ return build_min_nt (METHOD_CALL_EXPR, name, exp, parms, NULL_TREE);
}
- function = DECL_MAIN_VARIANT (function);
- mark_used (function);
-
- fntype = TREE_TYPE (function);
- if (TREE_CODE (fntype) == POINTER_TYPE)
- fntype = TREE_TYPE (fntype);
- basetype = DECL_CLASS_CONTEXT (function);
+ if (TREE_CODE (type) == REFERENCE_TYPE)
+ type = TREE_TYPE (type);
- /* If we are referencing a virtual function from an object
- of effectively static type, then there is no need
- to go through the virtual function table. */
- if (need_vtbl == maybe_needed)
+ if (TREE_CODE (basetype) == TREE_VEC)
{
- int fixed_type = resolves_to_fixed_type_p (instance, 0);
-
- if (all_virtual == 1
- && DECL_VINDEX (function)
- && may_be_remote (basetype))
- need_vtbl = needed;
- else if (DECL_VINDEX (function))
- need_vtbl = fixed_type ? unneeded : needed;
- else
- need_vtbl = not_needed;
+ binfo = basetype;
+ basetype = BINFO_TYPE (binfo);
}
+ else
+ binfo = NULL_TREE;
- if (TREE_CODE (fntype) == METHOD_TYPE && static_call_context
- && !DECL_CONSTRUCTOR_P (function))
+ /* Destructors can be "called" for simple types; see 5.2.4 and 12.4 Note
+ that explicit ~int is caught in the parser; this deals with typedefs
+ and template parms. */
+ if (TREE_CODE (name) == BIT_NOT_EXPR && ! IS_AGGR_TYPE (basetype))
{
- /* Let's be nasty to the user now, and give reasonable
- error messages. */
- instance_ptr = current_class_ptr;
- if (instance_ptr)
- {
- if (basetype != current_class_type)
- {
- if (basetype == error_mark_node)
- return error_mark_node;
- else
- {
- if (orig_basetype != NULL_TREE)
- error_not_base_type (orig_basetype, current_class_type);
- else
- error_not_base_type (function, current_class_type);
- return error_mark_node;
- }
- }
- }
- /* Only allow a static member function to call another static member
- function. */
- else if (DECL_LANG_SPECIFIC (function)
- && !DECL_STATIC_FUNCTION_P (function))
- {
- cp_error ("cannot call member function `%D' without object",
- function);
- return error_mark_node;
- }
+ if (type != basetype)
+ cp_error ("type of `%E' does not match destructor type `%T' (type was `%T')",
+ exp, basetype, type);
+ name = TREE_OPERAND (name, 0);
+ if (basetype != name && basetype != get_type_value (name))
+ cp_error ("qualified type `%T' does not match destructor name `~%T'",
+ basetype, name);
+ return cp_convert (void_type_node, exp);
}
- value_type = TREE_TYPE (fntype) ? TREE_TYPE (fntype) : void_type_node;
+ if (! is_aggr_type (basetype, 1))
+ return error_mark_node;
- if (TYPE_SIZE (complete_type (value_type)) == 0)
+ if (! IS_AGGR_TYPE (type))
{
- if (flags & LOOKUP_COMPLAIN)
- incomplete_type_error (0, value_type);
+ cp_error ("base object `%E' of scoped method call is of non-aggregate type `%T'",
+ exp, type);
return error_mark_node;
}
- if (DECL_STATIC_FUNCTION_P (function))
- parms = convert_arguments (NULL_TREE, TYPE_ARG_TYPES (fntype),
- TREE_CHAIN (parms), function, LOOKUP_NORMAL);
- else if (need_vtbl == unneeded)
+ if (! binfo)
{
- int sub_flags = DECL_CONSTRUCTOR_P (function) ? flags : LOOKUP_NORMAL;
- basetype = TREE_TYPE (instance);
- if (TYPE_METHOD_BASETYPE (TREE_TYPE (function))
- != TYPE_MAIN_VARIANT (basetype))
- {
- basetype = DECL_CLASS_CONTEXT (function);
- instance_ptr = convert_pointer_to (basetype, instance_ptr);
- instance = build_indirect_ref (instance_ptr, NULL_PTR);
- }
- parms = expr_tree_cons (NULL_TREE, instance_ptr,
- convert_arguments (NULL_TREE, TREE_CHAIN (TYPE_ARG_TYPES (fntype)), TREE_CHAIN (parms), function, sub_flags));
+ binfo = get_binfo (basetype, type, 1);
+ if (binfo == error_mark_node)
+ return error_mark_node;
+ if (! binfo)
+ error_not_base_type (basetype, type);
}
- else
+
+ if (binfo)
{
- if ((flags & LOOKUP_NONVIRTUAL) == 0)
- basetype = DECL_CONTEXT (function);
+ if (TREE_CODE (exp) == INDIRECT_REF)
+ decl = build_indirect_ref
+ (convert_pointer_to_real
+ (binfo, build_unary_op (ADDR_EXPR, exp, 0)), NULL_PTR);
+ else
+ decl = build_scoped_ref (exp, basetype);
- /* First parm could be integer_zerop with casts like
- ((Object*)0)->Object::IsA() */
- if (!integer_zerop (TREE_VALUE (parms)))
+ /* Call to a destructor. */
+ if (TREE_CODE (name) == BIT_NOT_EXPR)
{
- /* Since we can't have inheritance with a union, doing get_binfo
- on it won't work. We do all the convert_pointer_to_real
- stuff to handle MI correctly...for unions, that's not
- an issue, so we must short-circuit that extra work here. */
- tree tmp = TREE_TYPE (TREE_TYPE (TREE_VALUE (parms)));
- if (tmp != NULL_TREE && TREE_CODE (tmp) == UNION_TYPE)
- instance_ptr = TREE_VALUE (parms);
- else
- {
- tree binfo = get_binfo (basetype,
- TREE_TYPE (TREE_TYPE (TREE_VALUE (parms))),
- 0);
- instance_ptr = convert_pointer_to_real (binfo, TREE_VALUE (parms));
- }
- instance_ptr
- = convert_pointer_to (build_type_variant (basetype,
- constp, volatilep),
- instance_ptr);
-
- if (TREE_CODE (instance_ptr) == COND_EXPR)
+ /* Explicit call to destructor. */
+ name = TREE_OPERAND (name, 0);
+ if (! (name == TYPE_MAIN_VARIANT (TREE_TYPE (decl))
+ || name == constructor_name (TREE_TYPE (decl))
+ || TREE_TYPE (decl) == get_type_value (name)))
{
- instance_ptr = save_expr (instance_ptr);
- instance = build_indirect_ref (instance_ptr, NULL_PTR);
+ cp_error
+ ("qualified type `%T' does not match destructor name `~%T'",
+ TREE_TYPE (decl), name);
+ return error_mark_node;
}
- else if (TREE_CODE (instance_ptr) == NOP_EXPR
- && TREE_CODE (TREE_OPERAND (instance_ptr, 0)) == ADDR_EXPR
- && TREE_OPERAND (TREE_OPERAND (instance_ptr, 0), 0) == instance)
- ;
- /* The call to `convert_pointer_to' may return error_mark_node. */
- else if (instance_ptr == error_mark_node)
- return instance_ptr;
- else if (instance == NULL_TREE
- || TREE_CODE (instance) != INDIRECT_REF
- || TREE_OPERAND (instance, 0) != instance_ptr)
- instance = build_indirect_ref (instance_ptr, NULL_PTR);
+ if (! TYPE_HAS_DESTRUCTOR (TREE_TYPE (decl)))
+ return cp_convert (void_type_node, exp);
+
+ return build_delete (TREE_TYPE (decl), decl, integer_two_node,
+ LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR,
+ 0);
}
- parms = expr_tree_cons (NULL_TREE, instance_ptr,
- convert_arguments (NULL_TREE, TREE_CHAIN (TYPE_ARG_TYPES (fntype)), TREE_CHAIN (parms), function, LOOKUP_NORMAL));
+
+ /* Call to a method. */
+ return build_method_call (decl, name, parms, binfo,
+ LOOKUP_NORMAL|LOOKUP_NONVIRTUAL);
}
+ return error_mark_node;
+}
- if (parms == error_mark_node
- || (parms && TREE_CHAIN (parms) == error_mark_node))
- return error_mark_node;
+/* We want the address of a function or method. We avoid creating a
+ pointer-to-member function. */
+
+tree
+build_addr_func (function)
+ tree function;
+{
+ tree type = TREE_TYPE (function);
- if (need_vtbl == needed)
+ /* We have to do these by hand to avoid real pointer to member
+ functions. */
+ if (TREE_CODE (type) == METHOD_TYPE)
{
- function = build_vfn_ref (&TREE_VALUE (parms), instance,
- DECL_VINDEX (function));
- TREE_TYPE (function) = build_pointer_type (fntype);
- }
+ tree addr;
- if (TREE_CODE (function) == FUNCTION_DECL)
- GNU_xref_call (current_function_decl,
- IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (function)));
+ type = build_pointer_type (type);
- result = build_call (function, value_type, parms);
- if (IS_AGGR_TYPE (value_type))
- result = build_cplus_new (value_type, result);
- result = convert_from_reference (result);
- return result;
-}
+ if (mark_addressable (function) == 0)
+ return error_mark_node;
-/* Similar to `build_method_call', but for overloaded non-member functions.
- The name of this function comes through NAME. The name depends
- on PARMS.
+ addr = build1 (ADDR_EXPR, type, function);
- Note that this function must handle simple `C' promotions,
- as well as variable numbers of arguments (...), and
- default arguments to boot.
+ /* Address of a static or external variable or function counts
+ as a constant */
+ if (staticp (function))
+ TREE_CONSTANT (addr) = 1;
- If the overloading is successful, we return a tree node which
- contains the call to the function.
+ function = addr;
+ }
+ else
+ function = default_conversion (function);
- If overloading produces candidates which are probable, but not definite,
- we hold these candidates. If FINAL_CP is non-zero, then we are free
- to assume that final_cp points to enough storage for all candidates that
- this function might generate. The `harshness' array is preallocated for
- the first candidate, but not for subsequent ones.
+ return function;
+}
- Note that the DECL_RTL of FUNCTION must be made to agree with this
- function's new name. */
+/* Build a CALL_EXPR, we can handle FUNCTION_TYPEs, METHOD_TYPEs, or
+ POINTER_TYPE to those. Note, pointer to member function types
+ (TYPE_PTRMEMFUNC_P) must be handled by our callers. */
tree
-build_overload_call_real (fnname, parms, flags, final_cp, require_complete)
- tree fnname, parms;
- int flags;
- struct candidate *final_cp;
- int require_complete;
+build_call (function, result_type, parms)
+ tree function, result_type, parms;
{
- /* must check for overloading here */
- tree functions, function;
- tree parmtypes, last;
- register tree outer;
- int length;
- int parmlength = list_length (parms);
-
- struct candidate *candidates, *cp;
+ int is_constructor = 0;
- if (final_cp)
- {
- final_cp[0].h.code = 0;
- final_cp[0].h.distance = 0;
- final_cp[0].function = 0;
- /* end marker. */
- final_cp[1].h.code = EVIL_CODE;
- }
+ function = build_addr_func (function);
- parmtypes = default_parm_conversions (parms, &last);
- if (parmtypes == error_mark_node)
+ if (TYPE_PTRMEMFUNC_P (TREE_TYPE (function)))
{
- if (final_cp)
- final_cp->h.code = EVIL_CODE;
+ sorry ("unable to call pointer to member function here");
return error_mark_node;
}
- if (last)
- TREE_CHAIN (last) = void_list_node;
- else
- parmtypes = void_list_node;
-
- if (is_overloaded_fn (fnname))
- {
- functions = fnname;
- if (TREE_CODE (fnname) == TREE_LIST)
- fnname = TREE_PURPOSE (functions);
- else if (TREE_CODE (fnname) == FUNCTION_DECL)
- fnname = DECL_NAME (functions);
- }
- else
- functions = lookup_name_nonclass (fnname);
+ if (TREE_CODE (function) == ADDR_EXPR
+ && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL
+ && DECL_CONSTRUCTOR_P (TREE_OPERAND (function, 0)))
+ is_constructor = 1;
- if (functions == NULL_TREE)
- {
- if (flags & LOOKUP_SPECULATIVELY)
- return NULL_TREE;
- if (flags & LOOKUP_COMPLAIN)
- error ("only member functions apply");
- if (final_cp)
- final_cp->h.code = EVIL_CODE;
- return error_mark_node;
- }
+ function = build_nt (CALL_EXPR, function, parms, NULL_TREE);
+ TREE_HAS_CONSTRUCTOR (function) = is_constructor;
+ TREE_TYPE (function) = result_type;
+ TREE_SIDE_EFFECTS (function) = 1;
+
+ return function;
+}
- if (TREE_CODE (functions) == FUNCTION_DECL && ! IDENTIFIER_OPNAME_P (fnname))
- {
- functions = DECL_MAIN_VARIANT (functions);
- if (final_cp)
- {
- /* We are just curious whether this is a viable alternative or
- not. */
- compute_conversion_costs (functions, parms, final_cp, parmlength);
- return functions;
- }
- else
- return build_function_call_real (functions, parms, 1, flags);
- }
+/* Build something of the form ptr->method (args)
+ or object.method (args). This can also build
+ calls to constructors, and find friends.
- if (TREE_CODE (functions) == TREE_LIST
- && TREE_VALUE (functions) == NULL_TREE)
- {
- if (flags & LOOKUP_SPECULATIVELY)
- return NULL_TREE;
-
- if (flags & LOOKUP_COMPLAIN)
- cp_error ("function `%D' declared overloaded, but no instances of that function declared",
- TREE_PURPOSE (functions));
- if (final_cp)
- final_cp->h.code = EVIL_CODE;
- return error_mark_node;
- }
+ Member functions always take their class variable
+ as a pointer.
- length = count_functions (functions);
-
- if (final_cp)
- candidates = final_cp;
- else
- {
- candidates
- = (struct candidate *)alloca ((length+1) * sizeof (struct candidate));
- bzero ((char *) candidates, (length + 1) * sizeof (struct candidate));
- }
+ INSTANCE is a class instance.
- cp = candidates;
+ NAME is the name of the method desired, usually an IDENTIFIER_NODE.
- my_friendly_assert (is_overloaded_fn (functions), 169);
+ PARMS help to figure out what that NAME really refers to.
- functions = get_first_fn (functions);
+ BASETYPE_PATH, if non-NULL, contains a chain from the type of INSTANCE
+ down to the real instance type to use for access checking. We need this
+ information to get protected accesses correct. This parameter is used
+ by build_member_call.
- /* OUTER is the list of FUNCTION_DECLS, in a TREE_LIST. */
- for (outer = functions; outer; outer = DECL_CHAIN (outer))
- {
- int template_cost = 0;
- function = outer;
- if (TREE_CODE (function) != FUNCTION_DECL
- && ! (TREE_CODE (function) == TEMPLATE_DECL
- && TREE_CODE (DECL_TEMPLATE_RESULT (function)) == FUNCTION_DECL))
- {
- enum tree_code code = TREE_CODE (function);
- if (code == TEMPLATE_DECL)
- code = TREE_CODE (DECL_TEMPLATE_RESULT (function));
- if (code == CONST_DECL)
- cp_error_at
- ("enumeral value `%D' conflicts with function of same name",
- function);
- else if (code == VAR_DECL)
- {
- if (TREE_STATIC (function))
- cp_error_at
- ("variable `%D' conflicts with function of same name",
- function);
- else
- cp_error_at
- ("constant field `%D' conflicts with function of same name",
- function);
- }
- else if (code == TYPE_DECL)
- continue;
- else
- my_friendly_abort (2);
- error ("at this point in file");
- continue;
- }
- if (TREE_CODE (function) == TEMPLATE_DECL)
- {
- int ntparms = DECL_NTPARMS (function);
- tree targs = make_scratch_vec (ntparms);
- int i;
-
- i = type_unification (DECL_INNERMOST_TEMPLATE_PARMS (function),
- &TREE_VEC_ELT (targs, 0),
- TYPE_ARG_TYPES (TREE_TYPE (function)),
- parms, NULL_TREE, 0, 0);
- if (i == 0)
- {
- function = instantiate_template (function, targs);
- if (function == error_mark_node)
- return function;
- }
- }
+ FLAGS is the logical disjunction of zero or more LOOKUP_
+ flags. See cp-tree.h for more info.
- if (TREE_CODE (function) == TEMPLATE_DECL)
- {
- /* Unconverted template -- failed match. */
- cp->function = function;
- cp->u.bad_arg = -4;
- cp->h.code = EVIL_CODE;
- }
- else
- {
- struct candidate *cp2;
+ If this is all OK, calls build_function_call with the resolved
+ member function.
- /* Check that this decl is not the same as a function that's in
- the list due to some template instantiation. */
- cp2 = candidates;
- while (cp2 != cp)
- if (cp2->function == function)
- break;
- else
- cp2 += 1;
- if (cp2->function == function)
- continue;
+ This function must also handle being called to perform
+ initialization, promotion/coercion of arguments, and
+ instantiation of default parameters.
- function = DECL_MAIN_VARIANT (function);
+ Note that NAME may refer to an instance variable name. If
+ `operator()()' is defined for the type of that field, then we return
+ that result. */
- /* Can't use alloca here, since result might be
- passed to calling function. */
- cp->h_len = parmlength;
- cp->harshness = (struct harshness_code *)
- scratchalloc ((parmlength + 1) * sizeof (struct harshness_code));
+tree
+build_method_call (instance, name, parms, basetype_path, flags)
+ tree instance, name, parms, basetype_path;
+ int flags;
+{
+ tree result, basetype, instance_ptr;
- compute_conversion_costs (function, parms, cp, parmlength);
+#ifdef GATHER_STATISTICS
+ n_build_method_call++;
+#endif
- /* Make sure this is clear as well. */
- cp->h.int_penalty += template_cost;
+ if (instance == error_mark_node
+ || name == error_mark_node
+ || parms == error_mark_node
+ || (instance != NULL_TREE && TREE_TYPE (instance) == error_mark_node))
+ return error_mark_node;
- if ((cp[0].h.code & EVIL_CODE) == 0)
- {
- cp[1].h.code = EVIL_CODE;
- cp++;
- }
+ if (processing_template_decl)
+ {
+ if (TREE_CODE (name) == BIT_NOT_EXPR)
+ {
+ tree type = get_aggr_from_typedef (TREE_OPERAND (name, 0), 1);
+ name = build_min_nt (BIT_NOT_EXPR, type);
}
+
+ return build_min_nt (METHOD_CALL_EXPR, name, instance, parms, NULL_TREE);
}
- if (cp - candidates)
+ /* This is the logic that magically deletes the second argument to
+ operator delete, if it is not needed. */
+ if (name == ansi_opname[(int) DELETE_EXPR] && list_length (parms)==2)
{
- tree rval = error_mark_node;
+ tree save_last = TREE_CHAIN (parms);
+ tree result;
+ /* get rid of unneeded argument */
+ TREE_CHAIN (parms) = NULL_TREE;
+ result = build_method_call (instance, name, parms, basetype_path,
+ (LOOKUP_SPECULATIVELY|flags)
+ &~LOOKUP_COMPLAIN);
+ /* If it finds a match, return it. */
+ if (result)
+ return build_method_call (instance, name, parms, basetype_path, flags);
+ /* If it doesn't work, two argument delete must work */
+ TREE_CHAIN (parms) = save_last;
+ }
+ /* We already know whether it's needed or not for vec delete. */
+ else if (name == ansi_opname[(int) VEC_DELETE_EXPR]
+ && TYPE_LANG_SPECIFIC (TREE_TYPE (instance))
+ && ! TYPE_VEC_DELETE_TAKES_SIZE (TREE_TYPE (instance)))
+ TREE_CHAIN (parms) = NULL_TREE;
- /* Leave marker. */
- cp[0].h.code = EVIL_CODE;
- if (cp - candidates > 1)
- {
- struct candidate *best_cp
- = ideal_candidate (candidates, cp - candidates, parmlength);
- if (best_cp == (struct candidate *)0)
- {
- if (flags & LOOKUP_COMPLAIN)
- {
- cp_error ("call of overloaded `%D' is ambiguous", fnname);
- print_n_candidates (candidates, cp - candidates);
- }
- return error_mark_node;
- }
- else
- rval = best_cp->function;
- }
- else
+ if (TREE_CODE (name) == BIT_NOT_EXPR)
+ {
+ flags |= LOOKUP_DESTRUCTOR;
+ name = TREE_OPERAND (name, 0);
+ if (parms)
+ error ("destructors take no parameters");
+ basetype = TREE_TYPE (instance);
+ if (TREE_CODE (basetype) == REFERENCE_TYPE)
+ basetype = TREE_TYPE (basetype);
+ if (! (name == basetype
+ || (IS_AGGR_TYPE (basetype)
+ && name == constructor_name (basetype))
+ || basetype == get_type_value (name)))
{
- cp -= 1;
- if (cp->h.code & EVIL_CODE)
- {
- if (flags & LOOKUP_COMPLAIN)
- error ("type conversion ambiguous");
- }
- else
- rval = cp->function;
+ cp_error ("destructor name `~%D' does not match type `%T' of expression",
+ name, basetype);
+ return cp_convert (void_type_node, instance);
}
- if (final_cp)
- return rval;
-
- return build_function_call_real (rval, parms, require_complete, flags);
+ if (! TYPE_HAS_DESTRUCTOR (complete_type (basetype)))
+ return cp_convert (void_type_node, instance);
+ instance = default_conversion (instance);
+ instance_ptr = build_unary_op (ADDR_EXPR, instance, 0);
+ return build_delete (build_pointer_type (basetype),
+ instance_ptr, integer_two_node,
+ LOOKUP_NORMAL|LOOKUP_DESTRUCTOR, 0);
}
- if (flags & LOOKUP_SPECULATIVELY)
- return NULL_TREE;
-
- if (flags & LOOKUP_COMPLAIN)
- report_type_mismatch (cp, parms, "function");
-
- return error_mark_node;
-}
-
-/* This requires a complete type on the result of the call. */
-
-tree
-build_overload_call (fnname, parms, flags)
- tree fnname, parms;
- int flags;
-{
- return build_overload_call_real (fnname, parms, flags, (struct candidate *)0, 1);
+ return build_new_method_call (instance, name, parms, basetype_path, flags);
}
/* New overloading code. */
can_convert (to, from)
tree to, from;
{
- if (flag_ansi_overloading)
- {
- tree t = implicit_conversion (to, from, NULL_TREE, LOOKUP_NORMAL);
- return (t && ! ICS_BAD_FLAG (t));
- }
- else
- {
- struct harshness_code h;
- h = convert_harshness (to, from, NULL_TREE);
- return (h.code < USER_CODE) && (h.distance >= 0);
- }
+ tree t = implicit_conversion (to, from, NULL_TREE, LOOKUP_NORMAL);
+ return (t && ! ICS_BAD_FLAG (t));
}
int
can_convert_arg (to, from, arg)
tree to, from, arg;
{
- if (flag_ansi_overloading)
- {
- tree t = implicit_conversion (to, from, arg, LOOKUP_NORMAL);
- return (t && ! ICS_BAD_FLAG (t));
- }
- else
- {
- struct harshness_code h;
- h = convert_harshness (to, from, arg);
- return (h.code < USER_CODE) && (h.distance >= 0);
- }
+ tree t = implicit_conversion (to, from, arg, LOOKUP_NORMAL);
+ return (t && ! ICS_BAD_FLAG (t));
}
git://gcc.gnu.org / gcc.git / commitdiff