/* Build expressions with type checking for C compiler.
Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
- 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
+ 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of GCC.
#include "tm.h"
#include "rtl.h"
#include "tree.h"
+#include "langhooks.h"
#include "c-tree.h"
#include "tm_p.h"
#include "flags.h"
message within this initializer. */
static int missing_braces_mentioned;
-/* 1 if we explained undeclared var errors. */
-static int undeclared_variable_notice;
-
-static tree qualify_type PARAMS ((tree, tree));
-static int comp_target_types PARAMS ((tree, tree, int));
-static int function_types_compatible_p PARAMS ((tree, tree));
-static int type_lists_compatible_p PARAMS ((tree, tree));
-static tree decl_constant_value_for_broken_optimization PARAMS ((tree));
-static tree default_function_array_conversion PARAMS ((tree));
-static tree lookup_field PARAMS ((tree, tree));
-static tree convert_arguments PARAMS ((tree, tree, tree, tree));
-static tree pointer_diff PARAMS ((tree, tree));
-static tree unary_complex_lvalue PARAMS ((enum tree_code, tree, int));
-static void pedantic_lvalue_warning PARAMS ((enum tree_code));
-static tree internal_build_compound_expr PARAMS ((tree, int));
-static tree convert_for_assignment PARAMS ((tree, tree, const char *,
- tree, tree, int));
-static void warn_for_assignment PARAMS ((const char *, const char *,
- tree, int));
-static tree valid_compound_expr_initializer PARAMS ((tree, tree));
-static void push_string PARAMS ((const char *));
-static void push_member_name PARAMS ((tree));
-static void push_array_bounds PARAMS ((int));
-static int spelling_length PARAMS ((void));
-static char *print_spelling PARAMS ((char *));
-static void warning_init PARAMS ((const char *));
-static tree digest_init PARAMS ((tree, tree, int));
-static void output_init_element PARAMS ((tree, tree, tree, int));
-static void output_pending_init_elements PARAMS ((int));
-static int set_designator PARAMS ((int));
-static void push_range_stack PARAMS ((tree));
-static void add_pending_init PARAMS ((tree, tree));
-static void set_nonincremental_init PARAMS ((void));
-static void set_nonincremental_init_from_string PARAMS ((tree));
-static tree find_init_member PARAMS ((tree));
+static int require_constant_value;
+static int require_constant_elements;
+
+static tree qualify_type (tree, tree);
+static int tagged_types_tu_compatible_p (tree, tree);
+static int comp_target_types (tree, tree, int);
+static int function_types_compatible_p (tree, tree);
+static int type_lists_compatible_p (tree, tree);
+static tree decl_constant_value_for_broken_optimization (tree);
+static tree default_function_array_conversion (tree);
+static tree lookup_field (tree, tree);
+static tree convert_arguments (tree, tree, tree, tree);
+static tree pointer_diff (tree, tree);
+static tree internal_build_compound_expr (tree, int);
+static tree convert_for_assignment (tree, tree, const char *, tree, tree,
+ int);
+static void warn_for_assignment (const char *, const char *, tree, int);
+static tree valid_compound_expr_initializer (tree, tree);
+static void push_string (const char *);
+static void push_member_name (tree);
+static void push_array_bounds (int);
+static int spelling_length (void);
+static char *print_spelling (char *);
+static void warning_init (const char *);
+static tree digest_init (tree, tree, int);
+static void output_init_element (tree, tree, tree, int);
+static void output_pending_init_elements (int);
+static int set_designator (int);
+static void push_range_stack (tree);
+static void add_pending_init (tree, tree);
+static void set_nonincremental_init (void);
+static void set_nonincremental_init_from_string (tree);
+static tree find_init_member (tree);
+static int lvalue_or_else (tree, const char *);
\f
/* Do `exp = require_complete_type (exp);' to make sure exp
does not have an incomplete type. (That includes void types.) */
tree
-require_complete_type (value)
- tree value;
+require_complete_type (tree value)
{
tree type = TREE_TYPE (value);
and TYPE is the type that was invalid. */
void
-c_incomplete_type_error (value, type)
- tree value;
- tree type;
+c_incomplete_type_error (tree value, tree type)
{
const char *type_code_string;
arguments and return the new type. */
tree
-c_type_promotes_to (type)
- tree type;
+c_type_promotes_to (tree type)
{
if (TYPE_MAIN_VARIANT (type) == float_type_node)
return double_type_node;
if (c_promoting_integer_type_p (type))
{
/* Preserve unsignedness if not really getting any wider. */
- if (TREE_UNSIGNED (type)
+ if (TYPE_UNSIGNED (type)
&& (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)))
return unsigned_type_node;
return integer_type_node;
as well as those of TYPE. */
static tree
-qualify_type (type, like)
- tree type, like;
+qualify_type (tree type, tree like)
{
- return c_build_qualified_type (type,
+ return c_build_qualified_type (type,
TYPE_QUALS (type) | TYPE_QUALS (like));
}
\f
-/* Return the common type of two types.
- We assume that comptypes has already been done and returned 1;
- if that isn't so, this may crash. In particular, we assume that qualifiers
- match.
+/* Return the composite type of two compatible types.
- This is the type for the result of most arithmetic operations
- if the operands have the given two types. */
+ We assume that comptypes has already been done and returned
+ nonzero; if that isn't so, this may crash. In particular, we
+ assume that qualifiers match. */
tree
-common_type (t1, t2)
- tree t1, t2;
+composite_type (tree t1, tree t2)
{
enum tree_code code1;
enum tree_code code2;
if (t2 == error_mark_node)
return t1;
- /* Merge the attributes. */
- attributes = (*targetm.merge_type_attributes) (t1, t2);
-
- /* Treat an enum type as the unsigned integer type of the same width. */
-
- if (TREE_CODE (t1) == ENUMERAL_TYPE)
- t1 = c_common_type_for_size (TYPE_PRECISION (t1), 1);
- if (TREE_CODE (t2) == ENUMERAL_TYPE)
- t2 = c_common_type_for_size (TYPE_PRECISION (t2), 1);
-
code1 = TREE_CODE (t1);
code2 = TREE_CODE (t2);
- /* If one type is complex, form the common type of the non-complex
- components, then make that complex. Use T1 or T2 if it is the
- required type. */
- if (code1 == COMPLEX_TYPE || code2 == COMPLEX_TYPE)
- {
- tree subtype1 = code1 == COMPLEX_TYPE ? TREE_TYPE (t1) : t1;
- tree subtype2 = code2 == COMPLEX_TYPE ? TREE_TYPE (t2) : t2;
- tree subtype = common_type (subtype1, subtype2);
-
- if (code1 == COMPLEX_TYPE && TREE_TYPE (t1) == subtype)
- return build_type_attribute_variant (t1, attributes);
- else if (code2 == COMPLEX_TYPE && TREE_TYPE (t2) == subtype)
- return build_type_attribute_variant (t2, attributes);
- else
- return build_type_attribute_variant (build_complex_type (subtype),
- attributes);
- }
-
- switch (code1)
- {
- case INTEGER_TYPE:
- case REAL_TYPE:
- /* If only one is real, use it as the result. */
-
- if (code1 == REAL_TYPE && code2 != REAL_TYPE)
- return build_type_attribute_variant (t1, attributes);
-
- if (code2 == REAL_TYPE && code1 != REAL_TYPE)
- return build_type_attribute_variant (t2, attributes);
-
- /* Both real or both integers; use the one with greater precision. */
-
- if (TYPE_PRECISION (t1) > TYPE_PRECISION (t2))
- return build_type_attribute_variant (t1, attributes);
- else if (TYPE_PRECISION (t2) > TYPE_PRECISION (t1))
- return build_type_attribute_variant (t2, attributes);
-
- /* Same precision. Prefer longs to ints even when same size. */
-
- if (TYPE_MAIN_VARIANT (t1) == long_unsigned_type_node
- || TYPE_MAIN_VARIANT (t2) == long_unsigned_type_node)
- return build_type_attribute_variant (long_unsigned_type_node,
- attributes);
-
- if (TYPE_MAIN_VARIANT (t1) == long_integer_type_node
- || TYPE_MAIN_VARIANT (t2) == long_integer_type_node)
- {
- /* But preserve unsignedness from the other type,
- since long cannot hold all the values of an unsigned int. */
- if (TREE_UNSIGNED (t1) || TREE_UNSIGNED (t2))
- t1 = long_unsigned_type_node;
- else
- t1 = long_integer_type_node;
- return build_type_attribute_variant (t1, attributes);
- }
+ /* Merge the attributes. */
+ attributes = targetm.merge_type_attributes (t1, t2);
- /* Likewise, prefer long double to double even if same size. */
- if (TYPE_MAIN_VARIANT (t1) == long_double_type_node
- || TYPE_MAIN_VARIANT (t2) == long_double_type_node)
- return build_type_attribute_variant (long_double_type_node,
- attributes);
+ /* If one is an enumerated type and the other is the compatible
+ integer type, the composite type might be either of the two
+ (DR#013 question 3). For consistency, use the enumerated type as
+ the composite type. */
- /* Otherwise prefer the unsigned one. */
+ if (code1 == ENUMERAL_TYPE && code2 == INTEGER_TYPE)
+ return t1;
+ if (code2 == ENUMERAL_TYPE && code1 == INTEGER_TYPE)
+ return t2;
- if (TREE_UNSIGNED (t1))
- return build_type_attribute_variant (t1, attributes);
- else
- return build_type_attribute_variant (t2, attributes);
+ if (code1 != code2)
+ abort ();
+ switch (code1)
+ {
case POINTER_TYPE:
- /* For two pointers, do this recursively on the target type,
- and combine the qualifiers of the two types' targets. */
- /* This code was turned off; I don't know why.
- But ANSI C specifies doing this with the qualifiers.
- So I turned it on again. */
+ /* For two pointers, do this recursively on the target type. */
{
tree pointed_to_1 = TREE_TYPE (t1);
tree pointed_to_2 = TREE_TYPE (t2);
- tree target = common_type (TYPE_MAIN_VARIANT (pointed_to_1),
- TYPE_MAIN_VARIANT (pointed_to_2));
- t1 = build_pointer_type (c_build_qualified_type
- (target,
- TYPE_QUALS (pointed_to_1) |
- TYPE_QUALS (pointed_to_2)));
+ tree target = composite_type (pointed_to_1, pointed_to_2);
+ t1 = build_pointer_type (target);
return build_type_attribute_variant (t1, attributes);
}
-#if 0
- t1 = build_pointer_type (common_type (TREE_TYPE (t1), TREE_TYPE (t2)));
- return build_type_attribute_variant (t1, attributes);
-#endif
case ARRAY_TYPE:
{
- tree elt = common_type (TREE_TYPE (t1), TREE_TYPE (t2));
+ tree elt = composite_type (TREE_TYPE (t1), TREE_TYPE (t2));
/* Save space: see if the result is identical to one of the args. */
if (elt == TREE_TYPE (t1) && TYPE_DOMAIN (t1))
return build_type_attribute_variant (t1, attributes);
/* Function types: prefer the one that specified arg types.
If both do, merge the arg types. Also merge the return types. */
{
- tree valtype = common_type (TREE_TYPE (t1), TREE_TYPE (t2));
+ tree valtype = composite_type (TREE_TYPE (t1), TREE_TYPE (t2));
tree p1 = TYPE_ARG_TYPES (t1);
tree p2 = TYPE_ARG_TYPES (t2);
int len;
/* If both args specify argument types, we must merge the two
lists, argument by argument. */
-
- pushlevel (0);
- declare_parm_level (1);
+ /* Tell global_bindings_p to return false so that variable_size
+ doesn't abort on VLAs in parameter types. */
+ c_override_global_bindings_to_false = true;
len = list_length (p1);
newargs = 0;
TREE_VALUE (n) = TREE_VALUE (p1);
goto parm_done;
}
-
+
/* Given wait (union {union wait *u; int *i} *)
and wait (union wait *),
prefer union wait * as type of parm. */
goto parm_done;
}
}
- TREE_VALUE (n) = common_type (TREE_VALUE (p1), TREE_VALUE (p2));
+ TREE_VALUE (n) = composite_type (TREE_VALUE (p1), TREE_VALUE (p2));
parm_done: ;
}
- poplevel (0, 0, 0);
-
+ c_override_global_bindings_to_false = false;
t1 = build_function_type (valtype, newargs);
/* ... falls through ... */
}
}
}
+
+/* Return the type of a conditional expression between pointers to
+ possibly differently qualified versions of compatible types.
+
+ We assume that comp_target_types has already been done and returned
+ nonzero; if that isn't so, this may crash. */
+
+static tree
+common_pointer_type (tree t1, tree t2)
+{
+ tree attributes;
+ tree pointed_to_1;
+ tree pointed_to_2;
+ tree target;
+
+ /* Save time if the two types are the same. */
+
+ if (t1 == t2) return t1;
+
+ /* If one type is nonsense, use the other. */
+ if (t1 == error_mark_node)
+ return t2;
+ if (t2 == error_mark_node)
+ return t1;
+
+ if (TREE_CODE (t1) != POINTER_TYPE || TREE_CODE (t2) != POINTER_TYPE)
+ abort ();
+
+ /* Merge the attributes. */
+ attributes = targetm.merge_type_attributes (t1, t2);
+
+ /* Find the composite type of the target types, and combine the
+ qualifiers of the two types' targets. */
+ pointed_to_1 = TREE_TYPE (t1);
+ pointed_to_2 = TREE_TYPE (t2);
+ target = composite_type (TYPE_MAIN_VARIANT (pointed_to_1),
+ TYPE_MAIN_VARIANT (pointed_to_2));
+ t1 = build_pointer_type (c_build_qualified_type
+ (target,
+ TYPE_QUALS (pointed_to_1) |
+ TYPE_QUALS (pointed_to_2)));
+ return build_type_attribute_variant (t1, attributes);
+}
+
+/* Return the common type for two arithmetic types under the usual
+ arithmetic conversions. The default conversions have already been
+ applied, and enumerated types converted to their compatible integer
+ types. The resulting type is unqualified and has no attributes.
+
+ This is the type for the result of most arithmetic operations
+ if the operands have the given two types. */
+
+tree
+common_type (tree t1, tree t2)
+{
+ enum tree_code code1;
+ enum tree_code code2;
+
+ /* If one type is nonsense, use the other. */
+ if (t1 == error_mark_node)
+ return t2;
+ if (t2 == error_mark_node)
+ return t1;
+
+ if (TYPE_QUALS (t1) != TYPE_UNQUALIFIED)
+ t1 = TYPE_MAIN_VARIANT (t1);
+
+ if (TYPE_QUALS (t2) != TYPE_UNQUALIFIED)
+ t2 = TYPE_MAIN_VARIANT (t2);
+
+ if (TYPE_ATTRIBUTES (t1) != NULL_TREE)
+ t1 = build_type_attribute_variant (t1, NULL_TREE);
+
+ if (TYPE_ATTRIBUTES (t2) != NULL_TREE)
+ t2 = build_type_attribute_variant (t2, NULL_TREE);
+
+ /* Save time if the two types are the same. */
+
+ if (t1 == t2) return t1;
+
+ code1 = TREE_CODE (t1);
+ code2 = TREE_CODE (t2);
+
+ if (code1 != VECTOR_TYPE && code1 != COMPLEX_TYPE
+ && code1 != REAL_TYPE && code1 != INTEGER_TYPE)
+ abort ();
+
+ if (code2 != VECTOR_TYPE && code2 != COMPLEX_TYPE
+ && code2 != REAL_TYPE && code2 != INTEGER_TYPE)
+ abort ();
+
+ /* If one type is a vector type, return that type. (How the usual
+ arithmetic conversions apply to the vector types extension is not
+ precisely specified.) */
+ if (code1 == VECTOR_TYPE)
+ return t1;
+
+ if (code2 == VECTOR_TYPE)
+ return t2;
+
+ /* If one type is complex, form the common type of the non-complex
+ components, then make that complex. Use T1 or T2 if it is the
+ required type. */
+ if (code1 == COMPLEX_TYPE || code2 == COMPLEX_TYPE)
+ {
+ tree subtype1 = code1 == COMPLEX_TYPE ? TREE_TYPE (t1) : t1;
+ tree subtype2 = code2 == COMPLEX_TYPE ? TREE_TYPE (t2) : t2;
+ tree subtype = common_type (subtype1, subtype2);
+
+ if (code1 == COMPLEX_TYPE && TREE_TYPE (t1) == subtype)
+ return t1;
+ else if (code2 == COMPLEX_TYPE && TREE_TYPE (t2) == subtype)
+ return t2;
+ else
+ return build_complex_type (subtype);
+ }
+
+ /* If only one is real, use it as the result. */
+
+ if (code1 == REAL_TYPE && code2 != REAL_TYPE)
+ return t1;
+
+ if (code2 == REAL_TYPE && code1 != REAL_TYPE)
+ return t2;
+
+ /* Both real or both integers; use the one with greater precision. */
+
+ if (TYPE_PRECISION (t1) > TYPE_PRECISION (t2))
+ return t1;
+ else if (TYPE_PRECISION (t2) > TYPE_PRECISION (t1))
+ return t2;
+
+ /* Same precision. Prefer long longs to longs to ints when the
+ same precision, following the C99 rules on integer type rank
+ (which are equivalent to the C90 rules for C90 types). */
+
+ if (TYPE_MAIN_VARIANT (t1) == long_long_unsigned_type_node
+ || TYPE_MAIN_VARIANT (t2) == long_long_unsigned_type_node)
+ return long_long_unsigned_type_node;
+
+ if (TYPE_MAIN_VARIANT (t1) == long_long_integer_type_node
+ || TYPE_MAIN_VARIANT (t2) == long_long_integer_type_node)
+ {
+ if (TYPE_UNSIGNED (t1) || TYPE_UNSIGNED (t2))
+ return long_long_unsigned_type_node;
+ else
+ return long_long_integer_type_node;
+ }
+
+ if (TYPE_MAIN_VARIANT (t1) == long_unsigned_type_node
+ || TYPE_MAIN_VARIANT (t2) == long_unsigned_type_node)
+ return long_unsigned_type_node;
+
+ if (TYPE_MAIN_VARIANT (t1) == long_integer_type_node
+ || TYPE_MAIN_VARIANT (t2) == long_integer_type_node)
+ {
+ /* But preserve unsignedness from the other type,
+ since long cannot hold all the values of an unsigned int. */
+ if (TYPE_UNSIGNED (t1) || TYPE_UNSIGNED (t2))
+ return long_unsigned_type_node;
+ else
+ return long_integer_type_node;
+ }
+
+ /* Likewise, prefer long double to double even if same size. */
+ if (TYPE_MAIN_VARIANT (t1) == long_double_type_node
+ || TYPE_MAIN_VARIANT (t2) == long_double_type_node)
+ return long_double_type_node;
+
+ /* Otherwise prefer the unsigned one. */
+
+ if (TYPE_UNSIGNED (t1))
+ return t1;
+ else
+ return t2;
+}
\f
/* Return 1 if TYPE1 and TYPE2 are compatible types for assignment
or various other operations. Return 2 if they are compatible
but a warning may be needed if you use them together. */
int
-comptypes (type1, type2)
- tree type1, type2;
+comptypes (tree type1, tree type2)
{
tree t1 = type1;
tree t2 = type2;
/* If either type is the internal version of sizetype, return the
language version. */
if (TREE_CODE (t1) == INTEGER_TYPE && TYPE_IS_SIZETYPE (t1)
- && TYPE_DOMAIN (t1) != 0)
- t1 = TYPE_DOMAIN (t1);
+ && TYPE_ORIG_SIZE_TYPE (t1))
+ t1 = TYPE_ORIG_SIZE_TYPE (t1);
if (TREE_CODE (t2) == INTEGER_TYPE && TYPE_IS_SIZETYPE (t2)
- && TYPE_DOMAIN (t2) != 0)
- t2 = TYPE_DOMAIN (t2);
+ && TYPE_ORIG_SIZE_TYPE (t2))
+ t2 = TYPE_ORIG_SIZE_TYPE (t2);
+
- /* Treat an enum type as the integer type of the same width and
- signedness. */
+ /* Enumerated types are compatible with integer types, but this is
+ not transitive: two enumerated types in the same translation unit
+ are compatible with each other only if they are the same type. */
- if (TREE_CODE (t1) == ENUMERAL_TYPE)
- t1 = c_common_type_for_size (TYPE_PRECISION (t1), TREE_UNSIGNED (t1));
- if (TREE_CODE (t2) == ENUMERAL_TYPE)
- t2 = c_common_type_for_size (TYPE_PRECISION (t2), TREE_UNSIGNED (t2));
+ if (TREE_CODE (t1) == ENUMERAL_TYPE && TREE_CODE (t2) != ENUMERAL_TYPE)
+ t1 = c_common_type_for_size (TYPE_PRECISION (t1), TYPE_UNSIGNED (t1));
+ else if (TREE_CODE (t2) == ENUMERAL_TYPE && TREE_CODE (t1) != ENUMERAL_TYPE)
+ t2 = c_common_type_for_size (TYPE_PRECISION (t2), TYPE_UNSIGNED (t2));
if (t1 == t2)
return 1;
/* Different classes of types can't be compatible. */
- if (TREE_CODE (t1) != TREE_CODE (t2)) return 0;
+ if (TREE_CODE (t1) != TREE_CODE (t2))
+ return 0;
- /* Qualifiers must match. */
+ /* Qualifiers must match. C99 6.7.3p9 */
if (TYPE_QUALS (t1) != TYPE_QUALS (t2))
return 0;
return 1;
/* 1 if no need for warning yet, 2 if warning cause has been seen. */
- if (! (attrval = (*targetm.comp_type_attributes) (t1, t2)))
+ if (! (attrval = targetm.comp_type_attributes (t1, t2)))
return 0;
/* 1 if no need for warning yet, 2 if warning cause has been seen. */
switch (TREE_CODE (t1))
{
case POINTER_TYPE:
+ /* We must give ObjC the first crack at comparing pointers, since
+ protocol qualifiers may be involved. */
+ if (c_dialect_objc () && (val = objc_comptypes (t1, t2, 0)) >= 0)
+ break;
val = (TREE_TYPE (t1) == TREE_TYPE (t2)
- ? 1 : comptypes (TREE_TYPE (t1), TREE_TYPE (t2)));
+ ? 1 : comptypes (TREE_TYPE (t1), TREE_TYPE (t2)));
break;
case FUNCTION_TYPE:
}
case RECORD_TYPE:
- if (flag_objc && objc_comptypes (t1, t2, 0) == 1)
+ /* We are dealing with two distinct structs. In assorted Objective-C
+ corner cases, however, these can still be deemed equivalent. */
+ if (c_dialect_objc () && objc_comptypes (t1, t2, 0) == 1)
val = 1;
+
+ case ENUMERAL_TYPE:
+ case UNION_TYPE:
+ if (val != 1 && !same_translation_unit_p (t1, t2))
+ val = tagged_types_tu_compatible_p (t1, t2);
+ break;
+
+ case VECTOR_TYPE:
+ val = TYPE_VECTOR_SUBPARTS (t1) == TYPE_VECTOR_SUBPARTS (t2)
+ && comptypes (TREE_TYPE (t1), TREE_TYPE (t2));
break;
default:
*/
static int
-comp_target_types (ttl, ttr, reflexive)
- tree ttl, ttr;
- int reflexive;
+comp_target_types (tree ttl, tree ttr, int reflexive)
{
int val;
\f
/* Subroutines of `comptypes'. */
+/* Determine whether two trees derive from the same translation unit.
+ If the CONTEXT chain ends in a null, that tree's context is still
+ being parsed, so if two trees have context chains ending in null,
+ they're in the same translation unit. */
+int
+same_translation_unit_p (tree t1, tree t2)
+{
+ while (t1 && TREE_CODE (t1) != TRANSLATION_UNIT_DECL)
+ switch (TREE_CODE_CLASS (TREE_CODE (t1)))
+ {
+ case 'd': t1 = DECL_CONTEXT (t1); break;
+ case 't': t1 = TYPE_CONTEXT (t1); break;
+ case 'x': t1 = BLOCK_SUPERCONTEXT (t1); break; /* assume block */
+ default: abort ();
+ }
+
+ while (t2 && TREE_CODE (t2) != TRANSLATION_UNIT_DECL)
+ switch (TREE_CODE_CLASS (TREE_CODE (t2)))
+ {
+ case 'd': t2 = DECL_CONTEXT (t2); break;
+ case 't': t2 = TYPE_CONTEXT (t2); break;
+ case 'x': t2 = BLOCK_SUPERCONTEXT (t2); break; /* assume block */
+ default: abort ();
+ }
+
+ return t1 == t2;
+}
+
+/* The C standard says that two structures in different translation
+ units are compatible with each other only if the types of their
+ fields are compatible (among other things). So, consider two copies
+ of this structure: */
+
+struct tagged_tu_seen {
+ const struct tagged_tu_seen * next;
+ tree t1;
+ tree t2;
+};
+
+/* Can they be compatible with each other? We choose to break the
+ recursion by allowing those types to be compatible. */
+
+static const struct tagged_tu_seen * tagged_tu_seen_base;
+
+/* Return 1 if two 'struct', 'union', or 'enum' types T1 and T2 are
+ compatible. If the two types are not the same (which has been
+ checked earlier), this can only happen when multiple translation
+ units are being compiled. See C99 6.2.7 paragraph 1 for the exact
+ rules. */
+
+static int
+tagged_types_tu_compatible_p (tree t1, tree t2)
+{
+ tree s1, s2;
+ bool needs_warning = false;
+
+ /* We have to verify that the tags of the types are the same. This
+ is harder than it looks because this may be a typedef, so we have
+ to go look at the original type. It may even be a typedef of a
+ typedef...
+ In the case of compiler-created builtin structs the TYPE_DECL
+ may be a dummy, with no DECL_ORIGINAL_TYPE. Don't fault. */
+ while (TYPE_NAME (t1)
+ && TREE_CODE (TYPE_NAME (t1)) == TYPE_DECL
+ && DECL_ORIGINAL_TYPE (TYPE_NAME (t1)))
+ t1 = DECL_ORIGINAL_TYPE (TYPE_NAME (t1));
+
+ while (TYPE_NAME (t2)
+ && TREE_CODE (TYPE_NAME (t2)) == TYPE_DECL
+ && DECL_ORIGINAL_TYPE (TYPE_NAME (t2)))
+ t2 = DECL_ORIGINAL_TYPE (TYPE_NAME (t2));
+
+ /* C90 didn't have the requirement that the two tags be the same. */
+ if (flag_isoc99 && TYPE_NAME (t1) != TYPE_NAME (t2))
+ return 0;
+
+ /* C90 didn't say what happened if one or both of the types were
+ incomplete; we choose to follow C99 rules here, which is that they
+ are compatible. */
+ if (TYPE_SIZE (t1) == NULL
+ || TYPE_SIZE (t2) == NULL)
+ return 1;
+
+ {
+ const struct tagged_tu_seen * tts_i;
+ for (tts_i = tagged_tu_seen_base; tts_i != NULL; tts_i = tts_i->next)
+ if (tts_i->t1 == t1 && tts_i->t2 == t2)
+ return 1;
+ }
+
+ switch (TREE_CODE (t1))
+ {
+ case ENUMERAL_TYPE:
+ {
+
+ /* Speed up the case where the type values are in the same order. */
+ tree tv1 = TYPE_VALUES (t1);
+ tree tv2 = TYPE_VALUES (t2);
+
+ if (tv1 == tv2)
+ return 1;
+
+ for (;tv1 && tv2; tv1 = TREE_CHAIN (tv1), tv2 = TREE_CHAIN (tv2))
+ {
+ if (TREE_PURPOSE (tv1) != TREE_PURPOSE (tv2))
+ break;
+ if (simple_cst_equal (TREE_VALUE (tv1), TREE_VALUE (tv2)) != 1)
+ return 0;
+ }
+
+ if (tv1 == NULL_TREE && tv2 == NULL_TREE)
+ return 1;
+ if (tv1 == NULL_TREE || tv2 == NULL_TREE)
+ return 0;
+
+ if (list_length (TYPE_VALUES (t1)) != list_length (TYPE_VALUES (t2)))
+ return 0;
+
+ for (s1 = TYPE_VALUES (t1); s1; s1 = TREE_CHAIN (s1))
+ {
+ s2 = purpose_member (TREE_PURPOSE (s1), TYPE_VALUES (t2));
+ if (s2 == NULL
+ || simple_cst_equal (TREE_VALUE (s1), TREE_VALUE (s2)) != 1)
+ return 0;
+ }
+ return 1;
+ }
+
+ case UNION_TYPE:
+ {
+ if (list_length (TYPE_FIELDS (t1)) != list_length (TYPE_FIELDS (t2)))
+ return 0;
+
+ for (s1 = TYPE_FIELDS (t1); s1; s1 = TREE_CHAIN (s1))
+ {
+ bool ok = false;
+ struct tagged_tu_seen tts;
+
+ tts.next = tagged_tu_seen_base;
+ tts.t1 = t1;
+ tts.t2 = t2;
+ tagged_tu_seen_base = &tts;
+
+ if (DECL_NAME (s1) != NULL)
+ for (s2 = TYPE_VALUES (t2); s2; s2 = TREE_CHAIN (s2))
+ if (DECL_NAME (s1) == DECL_NAME (s2))
+ {
+ int result;
+ result = comptypes (TREE_TYPE (s1), TREE_TYPE (s2));
+ if (result == 0)
+ break;
+ if (result == 2)
+ needs_warning = true;
+
+ if (TREE_CODE (s1) == FIELD_DECL
+ && simple_cst_equal (DECL_FIELD_BIT_OFFSET (s1),
+ DECL_FIELD_BIT_OFFSET (s2)) != 1)
+ break;
+
+ ok = true;
+ break;
+ }
+ tagged_tu_seen_base = tts.next;
+ if (! ok)
+ return 0;
+ }
+ return needs_warning ? 2 : 1;
+ }
+
+ case RECORD_TYPE:
+ {
+ struct tagged_tu_seen tts;
+
+ tts.next = tagged_tu_seen_base;
+ tts.t1 = t1;
+ tts.t2 = t2;
+ tagged_tu_seen_base = &tts;
+
+ for (s1 = TYPE_FIELDS (t1), s2 = TYPE_FIELDS (t2);
+ s1 && s2;
+ s1 = TREE_CHAIN (s1), s2 = TREE_CHAIN (s2))
+ {
+ int result;
+ if (TREE_CODE (s1) != TREE_CODE (s2)
+ || DECL_NAME (s1) != DECL_NAME (s2))
+ break;
+ result = comptypes (TREE_TYPE (s1), TREE_TYPE (s2));
+ if (result == 0)
+ break;
+ if (result == 2)
+ needs_warning = true;
+
+ if (TREE_CODE (s1) == FIELD_DECL
+ && simple_cst_equal (DECL_FIELD_BIT_OFFSET (s1),
+ DECL_FIELD_BIT_OFFSET (s2)) != 1)
+ break;
+ }
+ tagged_tu_seen_base = tts.next;
+ if (s1 && s2)
+ return 0;
+ return needs_warning ? 2 : 1;
+ }
+
+ default:
+ abort ();
+ }
+}
+
/* Return 1 if two function types F1 and F2 are compatible.
If either type specifies no argument types,
the other must specify a fixed number of self-promoting arg types.
- Otherwise, if one type specifies only the number of arguments,
+ Otherwise, if one type specifies only the number of arguments,
the other must specify that number of self-promoting arg types.
Otherwise, the argument types must match. */
static int
-function_types_compatible_p (f1, f2)
- tree f1, f2;
+function_types_compatible_p (tree f1, tree f2)
{
tree args1, args2;
/* 1 if no need for warning yet, 2 if warning cause has been seen. */
int val = 1;
int val1;
-
- if (!(TREE_TYPE (f1) == TREE_TYPE (f2)
- || (val = comptypes (TREE_TYPE (f1), TREE_TYPE (f2)))))
+ tree ret1, ret2;
+
+ ret1 = TREE_TYPE (f1);
+ ret2 = TREE_TYPE (f2);
+
+ /* 'volatile' qualifiers on a function's return type mean the function
+ is noreturn. */
+ if (pedantic && TYPE_VOLATILE (ret1) != TYPE_VOLATILE (ret2))
+ pedwarn ("function return types not compatible due to `volatile'");
+ if (TYPE_VOLATILE (ret1))
+ ret1 = build_qualified_type (TYPE_MAIN_VARIANT (ret1),
+ TYPE_QUALS (ret1) & ~TYPE_QUAL_VOLATILE);
+ if (TYPE_VOLATILE (ret2))
+ ret2 = build_qualified_type (TYPE_MAIN_VARIANT (ret2),
+ TYPE_QUALS (ret2) & ~TYPE_QUAL_VOLATILE);
+ val = comptypes (ret1, ret2);
+ if (val == 0)
return 0;
args1 = TYPE_ARG_TYPES (f1);
or 2 for compatible with warning. */
static int
-type_lists_compatible_p (args1, args2)
- tree args1, args2;
+type_lists_compatible_p (tree args1, tree args2)
{
/* 1 if no need for warning yet, 2 if warning cause has been seen. */
int val = 1;
if (c_type_promotes_to (TREE_VALUE (args1)) != TREE_VALUE (args1))
return 0;
}
- else if (! (newval = comptypes (TYPE_MAIN_VARIANT (TREE_VALUE (args1)),
+ /* If one of the lists has an error marker, ignore this arg. */
+ else if (TREE_CODE (TREE_VALUE (args1)) == ERROR_MARK
+ || TREE_CODE (TREE_VALUE (args2)) == ERROR_MARK)
+ ;
+ else if (! (newval = comptypes (TYPE_MAIN_VARIANT (TREE_VALUE (args1)),
TYPE_MAIN_VARIANT (TREE_VALUE (args2)))))
{
/* Allow wait (union {union wait *u; int *i} *)
/* Compute the size to increment a pointer by. */
tree
-c_size_in_bytes (type)
- tree type;
+c_size_in_bytes (tree type)
{
enum tree_code code = TREE_CODE (type);
/* Return either DECL or its known constant value (if it has one). */
tree
-decl_constant_value (decl)
- tree decl;
+decl_constant_value (tree decl)
{
if (/* Don't change a variable array bound or initial value to a constant
- in a place where a variable is invalid. */
+ in a place where a variable is invalid. Note that DECL_INITIAL
+ isn't valid for a PARM_DECL. */
current_function_decl != 0
+ && TREE_CODE (decl) != PARM_DECL
&& ! TREE_THIS_VOLATILE (decl)
&& TREE_READONLY (decl)
&& DECL_INITIAL (decl) != 0
right test for avoiding misoptimizations either. */
static tree
-decl_constant_value_for_broken_optimization (decl)
- tree decl;
+decl_constant_value_for_broken_optimization (tree decl)
{
if (pedantic || DECL_MODE (decl) == BLKmode)
return decl;
return EXP. */
static tree
-default_function_array_conversion (exp)
- tree exp;
+default_function_array_conversion (tree exp)
{
tree orig_exp;
tree type = TREE_TYPE (exp);
int not_lvalue = 0;
/* Strip NON_LVALUE_EXPRs and no-op conversions, since we aren't using as
- an lvalue.
+ an lvalue.
Do not use STRIP_NOPS here! It will remove conversions from pointer
to integer and cause infinite recursion. */
}
if (TYPE_QUALS (type) || constp || volatilep)
- restype
+ restype
= c_build_qualified_type (restype,
- TYPE_QUALS (type)
+ TYPE_QUALS (type)
| (constp * TYPE_QUAL_CONST)
| (volatilep * TYPE_QUAL_VOLATILE));
if (TREE_CODE (exp) == INDIRECT_REF)
- return convert (TYPE_POINTER_TO (restype),
+ return convert (build_pointer_type (restype),
TREE_OPERAND (exp, 0));
if (TREE_CODE (exp) == COMPOUND_EXPR)
adr = build1 (ADDR_EXPR, ptrtype, exp);
if (!c_mark_addressable (exp))
return error_mark_node;
- TREE_CONSTANT (adr) = staticp (exp);
TREE_SIDE_EFFECTS (adr) = 0; /* Default would be, same as EXP. */
return adr;
}
In addition, manifest constants symbols are replaced by their values. */
tree
-default_conversion (exp)
- tree exp;
+default_conversion (tree exp)
{
tree orig_exp;
tree type = TREE_TYPE (exp);
}
/* Strip NON_LVALUE_EXPRs and no-op conversions, since we aren't using as
- an lvalue.
+ an lvalue.
Do not use STRIP_NOPS here! It will remove conversions from pointer
to integer and cause infinite recursion. */
TYPE_PRECISION (integer_type_node)),
((TYPE_PRECISION (type)
>= TYPE_PRECISION (integer_type_node))
- && TREE_UNSIGNED (type)));
+ && TYPE_UNSIGNED (type)));
return convert (type, exp);
}
if (c_promoting_integer_type_p (type))
{
/* Preserve unsignedness if not really getting any wider. */
- if (TREE_UNSIGNED (type)
+ if (TYPE_UNSIGNED (type)
&& TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node))
return convert (unsigned_type_node, exp);
TREE_VALUE of the list. Normally the list is of length one, but if
the component is embedded within (nested) anonymous structures or
unions, the list steps down the chain to the component. */
-
+
static tree
-lookup_field (decl, component)
- tree decl, component;
+lookup_field (tree decl, tree component)
{
tree type = TREE_TYPE (decl);
tree field;
if (TYPE_LANG_SPECIFIC (type))
{
int bot, top, half;
- tree *field_array = &TYPE_LANG_SPECIFIC (type)->elts[0];
+ tree *field_array = &TYPE_LANG_SPECIFIC (type)->s->elts[0];
field = TYPE_FIELDS (type);
bot = 0;
- top = TYPE_LANG_SPECIFIC (type)->len;
+ top = TYPE_LANG_SPECIFIC (type)->s->len;
while (top - bot > 1)
{
half = (top - bot + 1) >> 1;
if (anon)
return tree_cons (NULL_TREE, field, anon);
- }
+ }
}
/* Entire record is only anon unions. */
structure or union value DATUM. COMPONENT is an IDENTIFIER_NODE. */
tree
-build_component_ref (datum, component)
- tree datum, component;
+build_component_ref (tree datum, tree component)
{
tree type = TREE_TYPE (datum);
enum tree_code code = TREE_CODE (type);
tree field = NULL;
tree ref;
+ if (!objc_is_public (datum, component))
+ return error_mark_node;
+
/* If DATUM is a COMPOUND_EXPR, move our reference inside it.
- If pedantic ensure that the arguments are not lvalues; otherwise,
+ Ensure that the arguments are not lvalues; otherwise,
if the component is an array, it would wrongly decay to a pointer in
C89 mode.
We cannot do this with a COND_EXPR, because in a conditional expression
{
tree value = build_component_ref (TREE_OPERAND (datum, 1), component);
return build (COMPOUND_EXPR, TREE_TYPE (value),
- TREE_OPERAND (datum, 0), pedantic_non_lvalue (value));
+ TREE_OPERAND (datum, 0), non_lvalue (value));
}
default:
break;
end does it - by giving the anonymous entities each a
separate name and type, and then have build_component_ref
recursively call itself. We can't do that here. */
- for (; field; field = TREE_CHAIN (field))
+ do
{
tree subdatum = TREE_VALUE (field);
warn_deprecated_use (subdatum);
datum = ref;
+
+ field = TREE_CHAIN (field);
}
+ while (field);
return ref;
}
ERRORSTRING is the name of the operator to appear in error messages. */
tree
-build_indirect_ref (ptr, errorstring)
- tree ptr;
- const char *errorstring;
+build_indirect_ref (tree ptr, const char *errorstring)
{
tree pointer = default_conversion (ptr);
tree type = TREE_TYPE (pointer);
if (TREE_CODE (type) == POINTER_TYPE)
{
if (TREE_CODE (pointer) == ADDR_EXPR
- && !flag_volatile
&& (TREE_TYPE (TREE_OPERAND (pointer, 0))
== TREE_TYPE (type)))
return TREE_OPERAND (pointer, 0);
to change it via some other pointer. */
TREE_READONLY (ref) = TYPE_READONLY (t);
TREE_SIDE_EFFECTS (ref)
- = TYPE_VOLATILE (t) || TREE_SIDE_EFFECTS (pointer) || flag_volatile;
+ = TYPE_VOLATILE (t) || TREE_SIDE_EFFECTS (pointer);
TREE_THIS_VOLATILE (ref) = TYPE_VOLATILE (t);
return ref;
}
by functions). */
tree
-build_array_ref (array, index)
- tree array, index;
+build_array_ref (tree array, tree index)
{
if (index == 0)
{
|| TREE_TYPE (index) == error_mark_node)
return error_mark_node;
- if (TREE_CODE (TREE_TYPE (array)) == ARRAY_TYPE
- && TREE_CODE (array) != INDIRECT_REF)
+ if (TREE_CODE (TREE_TYPE (array)) == ARRAY_TYPE)
{
tree rval, type;
would get a crash in store_bit_field/extract_bit_field when trying
to access a non-existent part of the register. */
if (TREE_CODE (index) == INTEGER_CST
- && TYPE_VALUES (TREE_TYPE (array))
- && ! int_fits_type_p (index, TYPE_VALUES (TREE_TYPE (array))))
+ && TYPE_DOMAIN (TREE_TYPE (array))
+ && ! int_fits_type_p (index, TYPE_DOMAIN (TREE_TYPE (array))))
{
if (!c_mark_addressable (array))
return error_mark_node;
tree foo = array;
while (TREE_CODE (foo) == COMPONENT_REF)
foo = TREE_OPERAND (foo, 0);
- if (TREE_CODE (foo) == VAR_DECL && DECL_REGISTER (foo))
+ if (TREE_CODE (foo) == VAR_DECL && C_DECL_REGISTER (foo))
pedwarn ("ISO C forbids subscripting `register' array");
else if (! flag_isoc99 && ! lvalue_p (foo))
pedwarn ("ISO C90 forbids subscripting non-lvalue array");
TREE_THIS_VOLATILE (rval)
|= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array)))
/* This was added by rms on 16 Nov 91.
- It fixes vol struct foo *a; a->elts[1]
+ It fixes vol struct foo *a; a->elts[1]
in an inline function.
Hope it doesn't break something else. */
| TREE_THIS_VOLATILE (array));
/* Build an external reference to identifier ID. FUN indicates
whether this will be used for a function call. */
tree
-build_external_ref (id, fun)
- tree id;
- int fun;
+build_external_ref (tree id, int fun)
{
tree ref;
tree decl = lookup_name (id);
tree objc_ivar = lookup_objc_ivar (id);
- if (decl && TREE_DEPRECATED (decl))
- warn_deprecated_use (decl);
-
- if (!decl || decl == error_mark_node || C_DECL_ANTICIPATED (decl))
- {
- if (objc_ivar)
- ref = objc_ivar;
- else if (fun)
- {
- if (!decl || decl == error_mark_node)
- /* Ordinary implicit function declaration. */
- ref = implicitly_declare (id);
- else
- {
- /* Implicit declaration of built-in function. Don't
- change the built-in declaration, but don't let this
- go by silently, either. */
- implicit_decl_warning (id);
-
- /* only issue this warning once */
- C_DECL_ANTICIPATED (decl) = 0;
- ref = decl;
- }
- }
- else
- {
- /* Reference to undeclared variable, including reference to
- builtin outside of function-call context. */
- if (current_function_decl == 0)
- error ("`%s' undeclared here (not in a function)",
- IDENTIFIER_POINTER (id));
- else
- {
- if (IDENTIFIER_GLOBAL_VALUE (id) != error_mark_node
- || IDENTIFIER_ERROR_LOCUS (id) != current_function_decl)
- {
- error ("`%s' undeclared (first use in this function)",
- IDENTIFIER_POINTER (id));
-
- if (! undeclared_variable_notice)
- {
- error ("(Each undeclared identifier is reported only once");
- error ("for each function it appears in.)");
- undeclared_variable_notice = 1;
- }
- }
- IDENTIFIER_GLOBAL_VALUE (id) = error_mark_node;
- IDENTIFIER_ERROR_LOCUS (id) = current_function_decl;
- }
- return error_mark_node;
- }
- }
- else
+ if (decl && decl != error_mark_node)
{
/* Properly declared variable or function reference. */
if (!objc_ivar)
ref = decl;
- else if (decl != objc_ivar && IDENTIFIER_LOCAL_VALUE (id))
+ else if (decl != objc_ivar && !DECL_FILE_SCOPE_P (decl))
{
warning ("local declaration of `%s' hides instance variable",
IDENTIFIER_POINTER (id));
else
ref = objc_ivar;
}
+ else if (objc_ivar)
+ ref = objc_ivar;
+ else if (fun)
+ /* Implicit function declaration. */
+ ref = implicitly_declare (id);
+ else if (decl == error_mark_node)
+ /* Don't complain about something that's already been
+ complained about. */
+ return error_mark_node;
+ else
+ {
+ undeclared_variable (id);
+ return error_mark_node;
+ }
if (TREE_TYPE (ref) == error_mark_node)
return error_mark_node;
+ if (TREE_DEPRECATED (ref))
+ warn_deprecated_use (ref);
+
if (!skip_evaluation)
assemble_external (ref);
TREE_USED (ref) = 1;
{
ref = DECL_INITIAL (ref);
TREE_CONSTANT (ref) = 1;
+ TREE_INVARIANT (ref) = 1;
+ }
+ else if (current_function_decl != 0
+ && !DECL_FILE_SCOPE_P (current_function_decl)
+ && (TREE_CODE (ref) == VAR_DECL
+ || TREE_CODE (ref) == PARM_DECL
+ || TREE_CODE (ref) == FUNCTION_DECL))
+ {
+ tree context = decl_function_context (ref);
+
+ if (context != 0 && context != current_function_decl)
+ DECL_NONLOCAL (ref) = 1;
}
return ref;
FUNCTION's data type may be a function type or a pointer-to-function. */
tree
-build_function_call (function, params)
- tree function, params;
+build_function_call (tree function, tree params)
{
tree fntype, fundecl = 0;
tree coerced_params;
tree name = NULL_TREE, result;
+ tree tem;
/* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */
STRIP_TYPE_NOPS (function);
/* fntype now gets the type of function pointed to. */
fntype = TREE_TYPE (fntype);
+ /* Check that the function is called through a compatible prototype.
+ If it is not, replace the call by a trap, wrapped up in a compound
+ expression if necessary. This has the nice side-effect to prevent
+ the tree-inliner from generating invalid assignment trees which may
+ blow up in the RTL expander later.
+
+ ??? This doesn't work for Objective-C because objc_comptypes
+ refuses to compare function prototypes, yet the compiler appears
+ to build calls that are flagged as invalid by C's comptypes. */
+ if (! c_dialect_objc ()
+ && TREE_CODE (function) == NOP_EXPR
+ && TREE_CODE (tem = TREE_OPERAND (function, 0)) == ADDR_EXPR
+ && TREE_CODE (tem = TREE_OPERAND (tem, 0)) == FUNCTION_DECL
+ && ! comptypes (fntype, TREE_TYPE (tem)))
+ {
+ tree return_type = TREE_TYPE (fntype);
+ tree trap = build_function_call (built_in_decls[BUILT_IN_TRAP],
+ NULL_TREE);
+
+ /* This situation leads to run-time undefined behavior. We can't,
+ therefore, simply error unless we can prove that all possible
+ executions of the program must execute the code. */
+ warning ("function called through a non-compatible type");
+
+ /* We can, however, treat "undefined" any way we please.
+ Call abort to encourage the user to fix the program. */
+ inform ("if this code is reached, the program will abort");
+
+ if (VOID_TYPE_P (return_type))
+ return trap;
+ else
+ {
+ tree rhs;
+
+ if (AGGREGATE_TYPE_P (return_type))
+ rhs = build_compound_literal (return_type,
+ build_constructor (return_type,
+ NULL_TREE));
+ else
+ rhs = fold (build1 (NOP_EXPR, return_type, integer_zero_node));
+
+ return build (COMPOUND_EXPR, return_type, trap, rhs);
+ }
+ }
+
/* Convert the parameters to the types declared in the
function prototype, or apply default promotions. */
result = build (CALL_EXPR, TREE_TYPE (fntype),
function, coerced_params, NULL_TREE);
TREE_SIDE_EFFECTS (result) = 1;
- result = fold (result);
+
+ if (require_constant_value)
+ {
+ result = fold_initializer (result);
+
+ if (TREE_CONSTANT (result)
+ && (name == NULL_TREE
+ || strncmp (IDENTIFIER_POINTER (name), "__builtin_", 10) != 0))
+ pedwarn_init ("initializer element is not constant");
+ }
+ else
+ result = fold (result);
if (VOID_TYPE_P (TREE_TYPE (result)))
return result;
with the elements of the list in the TREE_VALUE slots of those nodes. */
static tree
-convert_arguments (typelist, values, name, fundecl)
- tree typelist, values, name, fundecl;
+convert_arguments (tree typelist, tree values, tree name, tree fundecl)
{
tree typetail, valtail;
tree result = NULL;
;
else if (formal_prec != TYPE_PRECISION (type1))
warn_for_assignment ("%s with different width due to prototype", (char *) 0, name, parmnum + 1);
- else if (TREE_UNSIGNED (type) == TREE_UNSIGNED (type1))
+ else if (TYPE_UNSIGNED (type) == TYPE_UNSIGNED (type1))
;
/* Don't complain if the formal parameter type
is an enum, because we can't tell now whether
&& TREE_CODE (TREE_OPERAND (val, 0)) == INTEGER_CST
&& int_fits_type_p (TREE_OPERAND (val, 0), type))
;
-#if 0 /* We never get such tree structure here. */
- else if (TREE_CODE (TREE_TYPE (val)) == ENUMERAL_TYPE
- && int_fits_type_p (TYPE_MIN_VALUE (TREE_TYPE (val)), type)
- && int_fits_type_p (TYPE_MAX_VALUE (TREE_TYPE (val)), type))
- /* Change in signedness doesn't matter
- if an enum value is unaffected. */
- ;
-#endif
/* If the value is extended from a narrower
unsigned type, it doesn't matter whether we
pass it as signed or unsigned; the value
certainly is the same either way. */
else if (TYPE_PRECISION (TREE_TYPE (val)) < TYPE_PRECISION (type)
- && TREE_UNSIGNED (TREE_TYPE (val)))
+ && TYPE_UNSIGNED (TREE_TYPE (val)))
;
- else if (TREE_UNSIGNED (type))
+ else if (TYPE_UNSIGNED (type))
warn_for_assignment ("%s as unsigned due to prototype", (char *) 0, name, parmnum + 1);
else
warn_for_assignment ("%s as signed due to prototype", (char *) 0, name, parmnum + 1);
}
}
- parmval = convert_for_assignment (type, val,
+ parmval = convert_for_assignment (type, val,
(char *) 0, /* arg passing */
fundecl, name, parmnum + 1);
-
- if (PROMOTE_PROTOTYPES
+
+ if (targetm.calls.promote_prototypes (fundecl ? TREE_TYPE (fundecl) : 0)
&& INTEGRAL_TYPE_P (type)
&& (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)))
parmval = default_conversion (parmval);
in a way that is likely to confuse the user. */
tree
-parser_build_binary_op (code, arg1, arg2)
- enum tree_code code;
- tree arg1, arg2;
+parser_build_binary_op (enum tree_code code, tree arg1, tree arg2)
{
tree result = build_binary_op (code, arg1, arg2, 1);
C_SET_EXP_ORIGINAL_CODE (result, code);
else
{
- int flag = TREE_CONSTANT (result);
/* We used to use NOP_EXPR rather than NON_LVALUE_EXPR
so that convert_for_assignment wouldn't strip it.
That way, we got warnings for things like p = (1 - 1).
But it turns out we should not get those warnings. */
result = build1 (NON_LVALUE_EXPR, TREE_TYPE (result), result);
C_SET_EXP_ORIGINAL_CODE (result, code);
- TREE_CONSTANT (result) = flag;
}
return result;
}
+\f
-/* Build a binary-operation expression without default conversions.
- CODE is the kind of expression to build.
- This function differs from `build' in several ways:
- the data type of the result is computed and recorded in it,
- warnings are generated if arg data types are invalid,
- special handling for addition and subtraction of pointers is known,
- and some optimization is done (operations on narrow ints
- are done in the narrower type when that gives the same result).
- Constant folding is also done before the result is returned.
-
- Note that the operands will never have enumeral types, or function
- or array types, because either they will have the default conversions
- performed or they have both just been converted to some other type in which
- the arithmetic is to be done. */
+/* Return true if `t' is known to be non-negative. */
-tree
-build_binary_op (code, orig_op0, orig_op1, convert_p)
- enum tree_code code;
- tree orig_op0, orig_op1;
- int convert_p;
+int
+c_tree_expr_nonnegative_p (tree t)
{
- tree type0, type1;
- enum tree_code code0, code1;
- tree op0, op1;
-
- /* Expression code to give to the expression when it is built.
- Normally this is CODE, which is what the caller asked for,
- but in some special cases we change it. */
- enum tree_code resultcode = code;
-
- /* Data type in which the computation is to be performed.
- In the simplest cases this is the common type of the arguments. */
- tree result_type = NULL;
+ if (TREE_CODE (t) == STMT_EXPR)
+ {
+ t = COMPOUND_BODY (STMT_EXPR_STMT (t));
- /* Nonzero means operands have already been type-converted
- in whatever way is necessary.
- Zero means they need to be converted to RESULT_TYPE. */
- int converted = 0;
+ /* Find the last statement in the chain, ignoring the final
+ * scope statement */
+ while (TREE_CHAIN (t) != NULL_TREE
+ && TREE_CODE (TREE_CHAIN (t)) != SCOPE_STMT)
+ t = TREE_CHAIN (t);
+ return tree_expr_nonnegative_p (TREE_OPERAND (t, 0));
+ }
+ return tree_expr_nonnegative_p (t);
+}
- /* Nonzero means create the expression with this type, rather than
- RESULT_TYPE. */
- tree build_type = 0;
+/* Return a tree for the difference of pointers OP0 and OP1.
+ The resulting tree has type int. */
- /* Nonzero means after finally constructing the expression
- convert it to this type. */
- tree final_type = 0;
+static tree
+pointer_diff (tree op0, tree op1)
+{
+ tree restype = ptrdiff_type_node;
- /* Nonzero if this is an operation like MIN or MAX which can
- safely be computed in short if both args are promoted shorts.
- Also implies COMMON.
- -1 indicates a bitwise operation; this makes a difference
- in the exact conditions for when it is safe to do the operation
- in a narrower mode. */
- int shorten = 0;
+ tree target_type = TREE_TYPE (TREE_TYPE (op0));
+ tree con0, con1, lit0, lit1;
+ tree orig_op1 = op1;
- /* Nonzero if this is a comparison operation;
- if both args are promoted shorts, compare the original shorts.
- Also implies COMMON. */
- int short_compare = 0;
+ if (pedantic || warn_pointer_arith)
+ {
+ if (TREE_CODE (target_type) == VOID_TYPE)
+ pedwarn ("pointer of type `void *' used in subtraction");
+ if (TREE_CODE (target_type) == FUNCTION_TYPE)
+ pedwarn ("pointer to a function used in subtraction");
+ }
- /* Nonzero if this is a right-shift operation, which can be computed on the
- original short and then promoted if the operand is a promoted short. */
- int short_shift = 0;
+ /* If the conversion to ptrdiff_type does anything like widening or
+ converting a partial to an integral mode, we get a convert_expression
+ that is in the way to do any simplifications.
+ (fold-const.c doesn't know that the extra bits won't be needed.
+ split_tree uses STRIP_SIGN_NOPS, which leaves conversions to a
+ different mode in place.)
+ So first try to find a common term here 'by hand'; we want to cover
+ at least the cases that occur in legal static initializers. */
+ con0 = TREE_CODE (op0) == NOP_EXPR ? TREE_OPERAND (op0, 0) : op0;
+ con1 = TREE_CODE (op1) == NOP_EXPR ? TREE_OPERAND (op1, 0) : op1;
- /* Nonzero means set RESULT_TYPE to the common type of the args. */
- int common = 0;
+ if (TREE_CODE (con0) == PLUS_EXPR)
+ {
+ lit0 = TREE_OPERAND (con0, 1);
+ con0 = TREE_OPERAND (con0, 0);
+ }
+ else
+ lit0 = integer_zero_node;
- if (convert_p)
+ if (TREE_CODE (con1) == PLUS_EXPR)
{
- op0 = default_conversion (orig_op0);
- op1 = default_conversion (orig_op1);
+ lit1 = TREE_OPERAND (con1, 1);
+ con1 = TREE_OPERAND (con1, 0);
}
else
+ lit1 = integer_zero_node;
+
+ if (operand_equal_p (con0, con1, 0))
{
- op0 = orig_op0;
- op1 = orig_op1;
+ op0 = lit0;
+ op1 = lit1;
}
- type0 = TREE_TYPE (op0);
- type1 = TREE_TYPE (op1);
- /* The expression codes of the data types of the arguments tell us
- whether the arguments are integers, floating, pointers, etc. */
- code0 = TREE_CODE (type0);
- code1 = TREE_CODE (type1);
+ /* First do the subtraction as integers;
+ then drop through to build the divide operator.
+ Do not do default conversions on the minus operator
+ in case restype is a short type. */
- /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */
- STRIP_TYPE_NOPS (op0);
- STRIP_TYPE_NOPS (op1);
+ op0 = build_binary_op (MINUS_EXPR, convert (restype, op0),
+ convert (restype, op1), 0);
+ /* This generates an error if op1 is pointer to incomplete type. */
+ if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (orig_op1))))
+ error ("arithmetic on pointer to an incomplete type");
- /* If an error was already reported for one of the arguments,
- avoid reporting another error. */
+ /* This generates an error if op0 is pointer to incomplete type. */
+ op1 = c_size_in_bytes (target_type);
- if (code0 == ERROR_MARK || code1 == ERROR_MARK)
+ /* Divide by the size, in easiest possible way. */
+ return fold (build (EXACT_DIV_EXPR, restype, op0, convert (restype, op1)));
+}
+\f
+/* Construct and perhaps optimize a tree representation
+ for a unary operation. CODE, a tree_code, specifies the operation
+ and XARG is the operand.
+ For any CODE other than ADDR_EXPR, FLAG nonzero suppresses
+ the default promotions (such as from short to int).
+ For ADDR_EXPR, the default promotions are not applied; FLAG nonzero
+ allows non-lvalues; this is only used to handle conversion of non-lvalue
+ arrays to pointers in C99. */
+
+tree
+build_unary_op (enum tree_code code, tree xarg, int flag)
+{
+ /* No default_conversion here. It causes trouble for ADDR_EXPR. */
+ tree arg = xarg;
+ tree argtype = 0;
+ enum tree_code typecode = TREE_CODE (TREE_TYPE (arg));
+ tree val;
+ int noconvert = flag;
+
+ if (typecode == ERROR_MARK)
return error_mark_node;
+ if (typecode == ENUMERAL_TYPE || typecode == BOOLEAN_TYPE)
+ typecode = INTEGER_TYPE;
switch (code)
{
- case PLUS_EXPR:
- /* Handle the pointer + int case. */
- if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
- return pointer_int_sum (PLUS_EXPR, op0, op1);
- else if (code1 == POINTER_TYPE && code0 == INTEGER_TYPE)
- return pointer_int_sum (PLUS_EXPR, op1, op0);
- else
- common = 1;
+ case CONVERT_EXPR:
+ /* This is used for unary plus, because a CONVERT_EXPR
+ is enough to prevent anybody from looking inside for
+ associativity, but won't generate any code. */
+ if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
+ || typecode == COMPLEX_TYPE))
+ {
+ error ("wrong type argument to unary plus");
+ return error_mark_node;
+ }
+ else if (!noconvert)
+ arg = default_conversion (arg);
+ arg = non_lvalue (arg);
break;
- case MINUS_EXPR:
- /* Subtraction of two similar pointers.
- We must subtract them as integers, then divide by object size. */
- if (code0 == POINTER_TYPE && code1 == POINTER_TYPE
- && comp_target_types (type0, type1, 1))
- return pointer_diff (op0, op1);
- /* Handle pointer minus int. Just like pointer plus int. */
- else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
- return pointer_int_sum (MINUS_EXPR, op0, op1);
- else
- common = 1;
+ case NEGATE_EXPR:
+ if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
+ || typecode == COMPLEX_TYPE
+ || typecode == VECTOR_TYPE))
+ {
+ error ("wrong type argument to unary minus");
+ return error_mark_node;
+ }
+ else if (!noconvert)
+ arg = default_conversion (arg);
break;
- case MULT_EXPR:
- common = 1;
+ case BIT_NOT_EXPR:
+ if (typecode == INTEGER_TYPE || typecode == VECTOR_TYPE)
+ {
+ if (!noconvert)
+ arg = default_conversion (arg);
+ }
+ else if (typecode == COMPLEX_TYPE)
+ {
+ code = CONJ_EXPR;
+ if (pedantic)
+ pedwarn ("ISO C does not support `~' for complex conjugation");
+ if (!noconvert)
+ arg = default_conversion (arg);
+ }
+ else
+ {
+ error ("wrong type argument to bit-complement");
+ return error_mark_node;
+ }
break;
- case TRUNC_DIV_EXPR:
- case CEIL_DIV_EXPR:
- case FLOOR_DIV_EXPR:
- case ROUND_DIV_EXPR:
- case EXACT_DIV_EXPR:
- /* Floating point division by zero is a legitimate way to obtain
- infinities and NaNs. */
- if (warn_div_by_zero && skip_evaluation == 0 && integer_zerop (op1))
- warning ("division by zero");
-
- if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE
- || code0 == COMPLEX_TYPE || code0 == VECTOR_TYPE)
- && (code1 == INTEGER_TYPE || code1 == REAL_TYPE
- || code1 == COMPLEX_TYPE || code1 == VECTOR_TYPE))
+ case ABS_EXPR:
+ if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE))
{
- if (!(code0 == INTEGER_TYPE && code1 == INTEGER_TYPE))
- resultcode = RDIV_EXPR;
- else
- /* Although it would be tempting to shorten always here, that
- loses on some targets, since the modulo instruction is
- undefined if the quotient can't be represented in the
- computation mode. We shorten only if unsigned or if
- dividing by something we know != -1. */
- shorten = (TREE_UNSIGNED (TREE_TYPE (orig_op0))
- || (TREE_CODE (op1) == INTEGER_CST
- && ! integer_all_onesp (op1)));
- common = 1;
+ error ("wrong type argument to abs");
+ return error_mark_node;
}
+ else if (!noconvert)
+ arg = default_conversion (arg);
break;
- case BIT_AND_EXPR:
- case BIT_ANDTC_EXPR:
- case BIT_IOR_EXPR:
- case BIT_XOR_EXPR:
- if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
- shorten = -1;
- else if (code0 == VECTOR_TYPE && code1 == VECTOR_TYPE)
- common = 1;
- break;
-
- case TRUNC_MOD_EXPR:
- case FLOOR_MOD_EXPR:
- if (warn_div_by_zero && skip_evaluation == 0 && integer_zerop (op1))
- warning ("division by zero");
-
- if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
+ case CONJ_EXPR:
+ /* Conjugating a real value is a no-op, but allow it anyway. */
+ if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
+ || typecode == COMPLEX_TYPE))
{
- /* Although it would be tempting to shorten always here, that loses
- on some targets, since the modulo instruction is undefined if the
- quotient can't be represented in the computation mode. We shorten
- only if unsigned or if dividing by something we know != -1. */
- shorten = (TREE_UNSIGNED (TREE_TYPE (orig_op0))
- || (TREE_CODE (op1) == INTEGER_CST
- && ! integer_all_onesp (op1)));
- common = 1;
+ error ("wrong type argument to conjugation");
+ return error_mark_node;
}
+ else if (!noconvert)
+ arg = default_conversion (arg);
break;
- case TRUTH_ANDIF_EXPR:
- case TRUTH_ORIF_EXPR:
- case TRUTH_AND_EXPR:
- case TRUTH_OR_EXPR:
- case TRUTH_XOR_EXPR:
- if ((code0 == INTEGER_TYPE || code0 == POINTER_TYPE
- || code0 == REAL_TYPE || code0 == COMPLEX_TYPE)
- && (code1 == INTEGER_TYPE || code1 == POINTER_TYPE
- || code1 == REAL_TYPE || code1 == COMPLEX_TYPE))
+ case TRUTH_NOT_EXPR:
+ if (typecode != INTEGER_TYPE
+ && typecode != REAL_TYPE && typecode != POINTER_TYPE
+ && typecode != COMPLEX_TYPE
+ /* These will convert to a pointer. */
+ && typecode != ARRAY_TYPE && typecode != FUNCTION_TYPE)
{
- /* Result of these operations is always an int,
- but that does not mean the operands should be
- converted to ints! */
- result_type = integer_type_node;
- op0 = c_common_truthvalue_conversion (op0);
- op1 = c_common_truthvalue_conversion (op1);
- converted = 1;
+ error ("wrong type argument to unary exclamation mark");
+ return error_mark_node;
}
- break;
+ arg = lang_hooks.truthvalue_conversion (arg);
+ return invert_truthvalue (arg);
- /* Shift operations: result has same type as first operand;
- always convert second operand to int.
- Also set SHORT_SHIFT if shifting rightward. */
+ case NOP_EXPR:
+ break;
- case RSHIFT_EXPR:
- if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
- {
- if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0)
- {
- if (tree_int_cst_sgn (op1) < 0)
- warning ("right shift count is negative");
- else
- {
- if (! integer_zerop (op1))
- short_shift = 1;
+ case REALPART_EXPR:
+ if (TREE_CODE (arg) == COMPLEX_CST)
+ return TREE_REALPART (arg);
+ else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE)
+ return fold (build1 (REALPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg));
+ else
+ return arg;
- if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0)
- warning ("right shift count >= width of type");
- }
- }
+ case IMAGPART_EXPR:
+ if (TREE_CODE (arg) == COMPLEX_CST)
+ return TREE_IMAGPART (arg);
+ else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE)
+ return fold (build1 (IMAGPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg));
+ else
+ return convert (TREE_TYPE (arg), integer_zero_node);
- /* Use the type of the value to be shifted. */
- result_type = type0;
- /* Convert the shift-count to an integer, regardless of size
- of value being shifted. */
- if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
- op1 = convert (integer_type_node, op1);
- /* Avoid converting op1 to result_type later. */
- converted = 1;
- }
- break;
+ case PREINCREMENT_EXPR:
+ case POSTINCREMENT_EXPR:
+ case PREDECREMENT_EXPR:
+ case POSTDECREMENT_EXPR:
- case LSHIFT_EXPR:
- if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
+ /* Increment or decrement the real part of the value,
+ and don't change the imaginary part. */
+ if (typecode == COMPLEX_TYPE)
{
- if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0)
- {
- if (tree_int_cst_sgn (op1) < 0)
- warning ("left shift count is negative");
+ tree real, imag;
- else if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0)
- warning ("left shift count >= width of type");
- }
+ if (pedantic)
+ pedwarn ("ISO C does not support `++' and `--' on complex types");
- /* Use the type of the value to be shifted. */
- result_type = type0;
- /* Convert the shift-count to an integer, regardless of size
- of value being shifted. */
- if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
- op1 = convert (integer_type_node, op1);
- /* Avoid converting op1 to result_type later. */
- converted = 1;
+ arg = stabilize_reference (arg);
+ real = build_unary_op (REALPART_EXPR, arg, 1);
+ imag = build_unary_op (IMAGPART_EXPR, arg, 1);
+ return build (COMPLEX_EXPR, TREE_TYPE (arg),
+ build_unary_op (code, real, 1), imag);
}
- break;
- case RROTATE_EXPR:
- case LROTATE_EXPR:
- if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
+ /* Report invalid types. */
+
+ if (typecode != POINTER_TYPE
+ && typecode != INTEGER_TYPE && typecode != REAL_TYPE)
{
- if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0)
- {
- if (tree_int_cst_sgn (op1) < 0)
- warning ("shift count is negative");
- else if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0)
- warning ("shift count >= width of type");
- }
+ if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR)
+ error ("wrong type argument to increment");
+ else
+ error ("wrong type argument to decrement");
- /* Use the type of the value to be shifted. */
- result_type = type0;
- /* Convert the shift-count to an integer, regardless of size
- of value being shifted. */
- if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
- op1 = convert (integer_type_node, op1);
- /* Avoid converting op1 to result_type later. */
- converted = 1;
+ return error_mark_node;
}
- break;
- case EQ_EXPR:
- case NE_EXPR:
- if (warn_float_equal && (code0 == REAL_TYPE || code1 == REAL_TYPE))
- warning ("comparing floating point with == or != is unsafe");
- /* Result of comparison is always int,
- but don't convert the args to int! */
- build_type = integer_type_node;
- if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE
- || code0 == COMPLEX_TYPE
- || code0 == VECTOR_TYPE)
- && (code1 == INTEGER_TYPE || code1 == REAL_TYPE
- || code1 == COMPLEX_TYPE
- || code1 == VECTOR_TYPE))
- short_compare = 1;
- else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE)
- {
- tree tt0 = TREE_TYPE (type0);
- tree tt1 = TREE_TYPE (type1);
- /* Anything compares with void *. void * compares with anything.
- Otherwise, the targets must be compatible
- and both must be object or both incomplete. */
- if (comp_target_types (type0, type1, 1))
- result_type = common_type (type0, type1);
- else if (VOID_TYPE_P (tt0))
- {
- /* op0 != orig_op0 detects the case of something
- whose value is 0 but which isn't a valid null ptr const. */
- if (pedantic && (!integer_zerop (op0) || op0 != orig_op0)
- && TREE_CODE (tt1) == FUNCTION_TYPE)
- pedwarn ("ISO C forbids comparison of `void *' with function pointer");
- }
- else if (VOID_TYPE_P (tt1))
- {
- if (pedantic && (!integer_zerop (op1) || op1 != orig_op1)
- && TREE_CODE (tt0) == FUNCTION_TYPE)
- pedwarn ("ISO C forbids comparison of `void *' with function pointer");
- }
- else
- pedwarn ("comparison of distinct pointer types lacks a cast");
+ {
+ tree inc;
+ tree result_type = TREE_TYPE (arg);
- if (result_type == NULL_TREE)
- result_type = ptr_type_node;
- }
- else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST
- && integer_zerop (op1))
- result_type = type0;
- else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST
- && integer_zerop (op0))
- result_type = type1;
- else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
- {
- result_type = type0;
- pedwarn ("comparison between pointer and integer");
- }
- else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE)
- {
- result_type = type1;
- pedwarn ("comparison between pointer and integer");
- }
- break;
+ arg = get_unwidened (arg, 0);
+ argtype = TREE_TYPE (arg);
- case MAX_EXPR:
- case MIN_EXPR:
- if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE)
- && (code1 == INTEGER_TYPE || code1 == REAL_TYPE))
- shorten = 1;
- else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE)
- {
- if (comp_target_types (type0, type1, 1))
- {
- result_type = common_type (type0, type1);
- if (pedantic
- && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE)
- pedwarn ("ISO C forbids ordered comparisons of pointers to functions");
- }
- else
- {
- result_type = ptr_type_node;
- pedwarn ("comparison of distinct pointer types lacks a cast");
- }
- }
- break;
+ /* Compute the increment. */
- case LE_EXPR:
- case GE_EXPR:
- case LT_EXPR:
- case GT_EXPR:
- build_type = integer_type_node;
- if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE)
- && (code1 == INTEGER_TYPE || code1 == REAL_TYPE))
- short_compare = 1;
- else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE)
- {
- if (comp_target_types (type0, type1, 1))
- {
- result_type = common_type (type0, type1);
- if (!COMPLETE_TYPE_P (TREE_TYPE (type0))
- != !COMPLETE_TYPE_P (TREE_TYPE (type1)))
- pedwarn ("comparison of complete and incomplete pointers");
- else if (pedantic
- && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE)
- pedwarn ("ISO C forbids ordered comparisons of pointers to functions");
- }
- else
- {
- result_type = ptr_type_node;
- pedwarn ("comparison of distinct pointer types lacks a cast");
- }
- }
- else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST
- && integer_zerop (op1))
- {
- result_type = type0;
- if (pedantic || extra_warnings)
- pedwarn ("ordered comparison of pointer with integer zero");
- }
- else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST
- && integer_zerop (op0))
- {
- result_type = type1;
- if (pedantic)
- pedwarn ("ordered comparison of pointer with integer zero");
- }
- else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
- {
- result_type = type0;
- pedwarn ("comparison between pointer and integer");
- }
- else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE)
+ if (typecode == POINTER_TYPE)
+ {
+ /* If pointer target is an undefined struct,
+ we just cannot know how to do the arithmetic. */
+ if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (result_type)))
+ {
+ if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR)
+ error ("increment of pointer to unknown structure");
+ else
+ error ("decrement of pointer to unknown structure");
+ }
+ else if ((pedantic || warn_pointer_arith)
+ && (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE
+ || TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE))
+ {
+ if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR)
+ pedwarn ("wrong type argument to increment");
+ else
+ pedwarn ("wrong type argument to decrement");
+ }
+
+ inc = c_size_in_bytes (TREE_TYPE (result_type));
+ }
+ else
+ inc = integer_one_node;
+
+ inc = convert (argtype, inc);
+
+ /* Complain about anything else that is not a true lvalue. */
+ if (!lvalue_or_else (arg, ((code == PREINCREMENT_EXPR
+ || code == POSTINCREMENT_EXPR)
+ ? "invalid lvalue in increment"
+ : "invalid lvalue in decrement")))
+ return error_mark_node;
+
+ /* Report a read-only lvalue. */
+ if (TREE_READONLY (arg))
+ readonly_error (arg,
+ ((code == PREINCREMENT_EXPR
+ || code == POSTINCREMENT_EXPR)
+ ? "increment" : "decrement"));
+
+ if (TREE_CODE (TREE_TYPE (arg)) == BOOLEAN_TYPE)
+ val = boolean_increment (code, arg);
+ else
+ val = build (code, TREE_TYPE (arg), arg, inc);
+ TREE_SIDE_EFFECTS (val) = 1;
+ val = convert (result_type, val);
+ if (TREE_CODE (val) != code)
+ TREE_NO_WARNING (val) = 1;
+ return val;
+ }
+
+ case ADDR_EXPR:
+ /* Note that this operation never does default_conversion. */
+
+ /* Let &* cancel out to simplify resulting code. */
+ if (TREE_CODE (arg) == INDIRECT_REF)
{
- result_type = type1;
- pedwarn ("comparison between pointer and integer");
+ /* Don't let this be an lvalue. */
+ if (lvalue_p (TREE_OPERAND (arg, 0)))
+ return non_lvalue (TREE_OPERAND (arg, 0));
+ return TREE_OPERAND (arg, 0);
}
- break;
- case UNORDERED_EXPR:
- case ORDERED_EXPR:
- case UNLT_EXPR:
- case UNLE_EXPR:
- case UNGT_EXPR:
- case UNGE_EXPR:
- case UNEQ_EXPR:
- build_type = integer_type_node;
- if (code0 != REAL_TYPE || code1 != REAL_TYPE)
+ /* For &x[y], return x+y */
+ if (TREE_CODE (arg) == ARRAY_REF)
{
- error ("unordered comparison on non-floating point argument");
- return error_mark_node;
+ if (!c_mark_addressable (TREE_OPERAND (arg, 0)))
+ return error_mark_node;
+ return build_binary_op (PLUS_EXPR, TREE_OPERAND (arg, 0),
+ TREE_OPERAND (arg, 1), 1);
}
- common = 1;
- break;
- default:
- break;
- }
+ /* Anything not already handled and not a true memory reference
+ or a non-lvalue array is an error. */
+ else if (typecode != FUNCTION_TYPE && !flag
+ && !lvalue_or_else (arg, "invalid lvalue in unary `&'"))
+ return error_mark_node;
- if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE || code0 == COMPLEX_TYPE
- || code0 == VECTOR_TYPE)
- &&
- (code1 == INTEGER_TYPE || code1 == REAL_TYPE || code1 == COMPLEX_TYPE
- || code1 == VECTOR_TYPE))
- {
- int none_complex = (code0 != COMPLEX_TYPE && code1 != COMPLEX_TYPE);
+ /* Ordinary case; arg is a COMPONENT_REF or a decl. */
+ argtype = TREE_TYPE (arg);
- if (shorten || common || short_compare)
- result_type = common_type (type0, type1);
+ /* If the lvalue is const or volatile, merge that into the type
+ to which the address will point. Note that you can't get a
+ restricted pointer by taking the address of something, so we
+ only have to deal with `const' and `volatile' here. */
+ if ((DECL_P (arg) || TREE_CODE_CLASS (TREE_CODE (arg)) == 'r')
+ && (TREE_READONLY (arg) || TREE_THIS_VOLATILE (arg)))
+ argtype = c_build_type_variant (argtype,
+ TREE_READONLY (arg),
+ TREE_THIS_VOLATILE (arg));
- /* For certain operations (which identify themselves by shorten != 0)
- if both args were extended from the same smaller type,
- do the arithmetic in that type and then extend.
+ argtype = build_pointer_type (argtype);
- shorten !=0 and !=1 indicates a bitwise operation.
- For them, this optimization is safe only if
- both args are zero-extended or both are sign-extended.
- Otherwise, we might change the result.
- Eg, (short)-1 | (unsigned short)-1 is (int)-1
- but calculated in (unsigned short) it would be (unsigned short)-1. */
+ if (!c_mark_addressable (arg))
+ return error_mark_node;
- if (shorten && none_complex)
- {
- int unsigned0, unsigned1;
- tree arg0 = get_narrower (op0, &unsigned0);
- tree arg1 = get_narrower (op1, &unsigned1);
- /* UNS is 1 if the operation to be done is an unsigned one. */
- int uns = TREE_UNSIGNED (result_type);
- tree type;
+ {
+ tree addr;
- final_type = result_type;
+ if (TREE_CODE (arg) == COMPONENT_REF)
+ {
+ tree field = TREE_OPERAND (arg, 1);
- /* Handle the case that OP0 (or OP1) does not *contain* a conversion
- but it *requires* conversion to FINAL_TYPE. */
+ addr = build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0), flag);
- if ((TYPE_PRECISION (TREE_TYPE (op0))
- == TYPE_PRECISION (TREE_TYPE (arg0)))
- && TREE_TYPE (op0) != final_type)
- unsigned0 = TREE_UNSIGNED (TREE_TYPE (op0));
- if ((TYPE_PRECISION (TREE_TYPE (op1))
- == TYPE_PRECISION (TREE_TYPE (arg1)))
- && TREE_TYPE (op1) != final_type)
- unsigned1 = TREE_UNSIGNED (TREE_TYPE (op1));
+ if (DECL_C_BIT_FIELD (field))
+ {
+ error ("attempt to take address of bit-field structure member `%s'",
+ IDENTIFIER_POINTER (DECL_NAME (field)));
+ return error_mark_node;
+ }
- /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */
+ addr = fold (build (PLUS_EXPR, argtype,
+ convert (argtype, addr),
+ convert (argtype, byte_position (field))));
+ }
+ else
+ addr = build1 (code, argtype, arg);
- /* For bitwise operations, signedness of nominal type
- does not matter. Consider only how operands were extended. */
- if (shorten == -1)
- uns = unsigned0;
+ return addr;
+ }
- /* Note that in all three cases below we refrain from optimizing
- an unsigned operation on sign-extended args.
- That would not be valid. */
+ default:
+ break;
+ }
- /* Both args variable: if both extended in same way
- from same width, do it in that width.
- Do it unsigned if args were zero-extended. */
- if ((TYPE_PRECISION (TREE_TYPE (arg0))
- < TYPE_PRECISION (result_type))
- && (TYPE_PRECISION (TREE_TYPE (arg1))
- == TYPE_PRECISION (TREE_TYPE (arg0)))
- && unsigned0 == unsigned1
- && (unsigned0 || !uns))
- result_type
- = c_common_signed_or_unsigned_type
- (unsigned0, common_type (TREE_TYPE (arg0), TREE_TYPE (arg1)));
- else if (TREE_CODE (arg0) == INTEGER_CST
- && (unsigned1 || !uns)
- && (TYPE_PRECISION (TREE_TYPE (arg1))
- < TYPE_PRECISION (result_type))
- && (type
- = c_common_signed_or_unsigned_type (unsigned1,
- TREE_TYPE (arg1)),
- int_fits_type_p (arg0, type)))
- result_type = type;
- else if (TREE_CODE (arg1) == INTEGER_CST
- && (unsigned0 || !uns)
- && (TYPE_PRECISION (TREE_TYPE (arg0))
- < TYPE_PRECISION (result_type))
- && (type
- = c_common_signed_or_unsigned_type (unsigned0,
- TREE_TYPE (arg0)),
- int_fits_type_p (arg1, type)))
- result_type = type;
- }
+ if (argtype == 0)
+ argtype = TREE_TYPE (arg);
+ val = build1 (code, argtype, arg);
+ return require_constant_value ? fold_initializer (val) : fold (val);
+}
- /* Shifts can be shortened if shifting right. */
+/* Return nonzero if REF is an lvalue valid for this language.
+ Lvalues can be assigned, unless their type has TYPE_READONLY.
+ Lvalues can have their address taken, unless they have C_DECL_REGISTER. */
- if (short_shift)
- {
- int unsigned_arg;
- tree arg0 = get_narrower (op0, &unsigned_arg);
+int
+lvalue_p (tree ref)
+{
+ enum tree_code code = TREE_CODE (ref);
- final_type = result_type;
+ switch (code)
+ {
+ case REALPART_EXPR:
+ case IMAGPART_EXPR:
+ case COMPONENT_REF:
+ return lvalue_p (TREE_OPERAND (ref, 0));
- if (arg0 == op0 && final_type == TREE_TYPE (op0))
- unsigned_arg = TREE_UNSIGNED (TREE_TYPE (op0));
+ case COMPOUND_LITERAL_EXPR:
+ case STRING_CST:
+ return 1;
- if (TYPE_PRECISION (TREE_TYPE (arg0)) < TYPE_PRECISION (result_type)
- /* We can shorten only if the shift count is less than the
- number of bits in the smaller type size. */
- && compare_tree_int (op1, TYPE_PRECISION (TREE_TYPE (arg0))) < 0
- /* We cannot drop an unsigned shift after sign-extension. */
- && (!TREE_UNSIGNED (final_type) || unsigned_arg))
- {
- /* Do an unsigned shift if the operand was zero-extended. */
- result_type
- = c_common_signed_or_unsigned_type (unsigned_arg,
- TREE_TYPE (arg0));
- /* Convert value-to-be-shifted to that type. */
- if (TREE_TYPE (op0) != result_type)
- op0 = convert (result_type, op0);
- converted = 1;
- }
- }
+ case INDIRECT_REF:
+ case ARRAY_REF:
+ case VAR_DECL:
+ case PARM_DECL:
+ case RESULT_DECL:
+ case ERROR_MARK:
+ return (TREE_CODE (TREE_TYPE (ref)) != FUNCTION_TYPE
+ && TREE_CODE (TREE_TYPE (ref)) != METHOD_TYPE);
- /* Comparison operations are shortened too but differently.
- They identify themselves by setting short_compare = 1. */
+ case BIND_EXPR:
+ case RTL_EXPR:
+ return TREE_CODE (TREE_TYPE (ref)) == ARRAY_TYPE;
- if (short_compare)
- {
- /* Don't write &op0, etc., because that would prevent op0
- from being kept in a register.
- Instead, make copies of the our local variables and
- pass the copies by reference, then copy them back afterward. */
- tree xop0 = op0, xop1 = op1, xresult_type = result_type;
- enum tree_code xresultcode = resultcode;
- tree val
- = shorten_compare (&xop0, &xop1, &xresult_type, &xresultcode);
+ default:
+ return 0;
+ }
+}
- if (val != 0)
- return val;
+/* Return nonzero if REF is an lvalue valid for this language;
+ otherwise, print an error message and return zero. */
- op0 = xop0, op1 = xop1;
- converted = 1;
- resultcode = xresultcode;
+static int
+lvalue_or_else (tree ref, const char *msgid)
+{
+ int win = lvalue_p (ref);
- if ((warn_sign_compare < 0 ? extra_warnings : warn_sign_compare != 0)
- && skip_evaluation == 0)
- {
- int op0_signed = ! TREE_UNSIGNED (TREE_TYPE (orig_op0));
- int op1_signed = ! TREE_UNSIGNED (TREE_TYPE (orig_op1));
- int unsignedp0, unsignedp1;
- tree primop0 = get_narrower (op0, &unsignedp0);
- tree primop1 = get_narrower (op1, &unsignedp1);
+ if (! win)
+ error ("%s", msgid);
- xop0 = orig_op0;
- xop1 = orig_op1;
- STRIP_TYPE_NOPS (xop0);
- STRIP_TYPE_NOPS (xop1);
+ return win;
+}
- /* Give warnings for comparisons between signed and unsigned
- quantities that may fail.
+\f
+/* Warn about storing in something that is `const'. */
- Do the checking based on the original operand trees, so that
- casts will be considered, but default promotions won't be.
+void
+readonly_error (tree arg, const char *msgid)
+{
+ if (TREE_CODE (arg) == COMPONENT_REF)
+ {
+ if (TYPE_READONLY (TREE_TYPE (TREE_OPERAND (arg, 0))))
+ readonly_error (TREE_OPERAND (arg, 0), msgid);
+ else
+ error ("%s of read-only member `%s'", _(msgid),
+ IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (arg, 1))));
+ }
+ else if (TREE_CODE (arg) == VAR_DECL)
+ error ("%s of read-only variable `%s'", _(msgid),
+ IDENTIFIER_POINTER (DECL_NAME (arg)));
+ else
+ error ("%s of read-only location", _(msgid));
+}
+\f
+/* Mark EXP saying that we need to be able to take the
+ address of it; it should not be allocated in a register.
+ Returns true if successful. */
- Do not warn if the comparison is being done in a signed type,
- since the signed type will only be chosen if it can represent
- all the values of the unsigned type. */
- if (! TREE_UNSIGNED (result_type))
- /* OK */;
- /* Do not warn if both operands are the same signedness. */
- else if (op0_signed == op1_signed)
- /* OK */;
- else
- {
- tree sop, uop;
+bool
+c_mark_addressable (tree exp)
+{
+ tree x = exp;
- if (op0_signed)
- sop = xop0, uop = xop1;
- else
- sop = xop1, uop = xop0;
+ while (1)
+ switch (TREE_CODE (x))
+ {
+ case COMPONENT_REF:
+ if (DECL_C_BIT_FIELD (TREE_OPERAND (x, 1)))
+ {
+ error ("cannot take address of bit-field `%s'",
+ IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (x, 1))));
+ return false;
+ }
- /* Do not warn if the signed quantity is an
- unsuffixed integer literal (or some static
- constant expression involving such literals or a
- conditional expression involving such literals)
- and it is non-negative. */
- if (c_tree_expr_nonnegative_p (sop))
- /* OK */;
- /* Do not warn if the comparison is an equality operation,
- the unsigned quantity is an integral constant, and it
- would fit in the result if the result were signed. */
- else if (TREE_CODE (uop) == INTEGER_CST
- && (resultcode == EQ_EXPR || resultcode == NE_EXPR)
- && int_fits_type_p
- (uop, c_common_signed_type (result_type)))
- /* OK */;
- /* Do not warn if the unsigned quantity is an enumeration
- constant and its maximum value would fit in the result
- if the result were signed. */
- else if (TREE_CODE (uop) == INTEGER_CST
- && TREE_CODE (TREE_TYPE (uop)) == ENUMERAL_TYPE
- && int_fits_type_p
- (TYPE_MAX_VALUE (TREE_TYPE(uop)),
- c_common_signed_type (result_type)))
- /* OK */;
- else
- warning ("comparison between signed and unsigned");
- }
+ /* ... fall through ... */
- /* Warn if two unsigned values are being compared in a size
- larger than their original size, and one (and only one) is the
- result of a `~' operator. This comparison will always fail.
+ case ADDR_EXPR:
+ case ARRAY_REF:
+ case REALPART_EXPR:
+ case IMAGPART_EXPR:
+ x = TREE_OPERAND (x, 0);
+ break;
- Also warn if one operand is a constant, and the constant
- does not have all bits set that are set in the ~ operand
- when it is extended. */
+ case COMPOUND_LITERAL_EXPR:
+ case CONSTRUCTOR:
+ TREE_ADDRESSABLE (x) = 1;
+ return true;
- if ((TREE_CODE (primop0) == BIT_NOT_EXPR)
- != (TREE_CODE (primop1) == BIT_NOT_EXPR))
- {
- if (TREE_CODE (primop0) == BIT_NOT_EXPR)
- primop0 = get_narrower (TREE_OPERAND (primop0, 0),
- &unsignedp0);
- else
- primop1 = get_narrower (TREE_OPERAND (primop1, 0),
- &unsignedp1);
-
- if (host_integerp (primop0, 0) || host_integerp (primop1, 0))
- {
- tree primop;
- HOST_WIDE_INT constant, mask;
- int unsignedp, bits;
+ case VAR_DECL:
+ case CONST_DECL:
+ case PARM_DECL:
+ case RESULT_DECL:
+ if (C_DECL_REGISTER (x)
+ && DECL_NONLOCAL (x))
+ {
+ if (TREE_PUBLIC (x) || TREE_STATIC (x) || DECL_EXTERNAL (x))
+ {
+ error ("global register variable `%s' used in nested function",
+ IDENTIFIER_POINTER (DECL_NAME (x)));
+ return false;
+ }
+ pedwarn ("register variable `%s' used in nested function",
+ IDENTIFIER_POINTER (DECL_NAME (x)));
+ }
+ else if (C_DECL_REGISTER (x))
+ {
+ if (TREE_PUBLIC (x) || TREE_STATIC (x) || DECL_EXTERNAL (x))
+ {
+ error ("address of global register variable `%s' requested",
+ IDENTIFIER_POINTER (DECL_NAME (x)));
+ return false;
+ }
- if (host_integerp (primop0, 0))
- {
- primop = primop1;
- unsignedp = unsignedp1;
- constant = tree_low_cst (primop0, 0);
- }
- else
- {
- primop = primop0;
- unsignedp = unsignedp0;
- constant = tree_low_cst (primop1, 0);
- }
+ pedwarn ("address of register variable `%s' requested",
+ IDENTIFIER_POINTER (DECL_NAME (x)));
+ }
+ put_var_into_stack (x, /*rescan=*/true);
- bits = TYPE_PRECISION (TREE_TYPE (primop));
- if (bits < TYPE_PRECISION (result_type)
- && bits < HOST_BITS_PER_WIDE_INT && unsignedp)
- {
- mask = (~ (HOST_WIDE_INT) 0) << bits;
- if ((mask & constant) != mask)
- warning ("comparison of promoted ~unsigned with constant");
- }
- }
- else if (unsignedp0 && unsignedp1
- && (TYPE_PRECISION (TREE_TYPE (primop0))
- < TYPE_PRECISION (result_type))
- && (TYPE_PRECISION (TREE_TYPE (primop1))
- < TYPE_PRECISION (result_type)))
- warning ("comparison of promoted ~unsigned with unsigned");
- }
- }
- }
+ /* drops in */
+ case FUNCTION_DECL:
+ TREE_ADDRESSABLE (x) = 1;
+ /* drops out */
+ default:
+ return true;
}
+}
+\f
+/* Build and return a conditional expression IFEXP ? OP1 : OP2. */
- /* At this point, RESULT_TYPE must be nonzero to avoid an error message.
- If CONVERTED is zero, both args will be converted to type RESULT_TYPE.
- Then the expression will be built.
- It will be given type FINAL_TYPE if that is nonzero;
- otherwise, it will be given type RESULT_TYPE. */
+tree
+build_conditional_expr (tree ifexp, tree op1, tree op2)
+{
+ tree type1;
+ tree type2;
+ enum tree_code code1;
+ enum tree_code code2;
+ tree result_type = NULL;
+ tree orig_op1 = op1, orig_op2 = op2;
- if (!result_type)
- {
- binary_op_error (code);
- return error_mark_node;
- }
+ ifexp = lang_hooks.truthvalue_conversion (default_conversion (ifexp));
- if (! converted)
- {
- if (TREE_TYPE (op0) != result_type)
- op0 = convert (result_type, op0);
- if (TREE_TYPE (op1) != result_type)
- op1 = convert (result_type, op1);
- }
-
- if (build_type == NULL_TREE)
- build_type = result_type;
+ /* Promote both alternatives. */
- {
- tree result = build (resultcode, build_type, op0, op1);
- tree folded;
+ if (TREE_CODE (TREE_TYPE (op1)) != VOID_TYPE)
+ op1 = default_conversion (op1);
+ if (TREE_CODE (TREE_TYPE (op2)) != VOID_TYPE)
+ op2 = default_conversion (op2);
- folded = fold (result);
- if (folded == result)
- TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1);
- if (final_type != 0)
- return convert (final_type, folded);
- return folded;
- }
-}
-\f
+ if (TREE_CODE (ifexp) == ERROR_MARK
+ || TREE_CODE (TREE_TYPE (op1)) == ERROR_MARK
+ || TREE_CODE (TREE_TYPE (op2)) == ERROR_MARK)
+ return error_mark_node;
-/* Return true if `t' is known to be non-negative. */
+ type1 = TREE_TYPE (op1);
+ code1 = TREE_CODE (type1);
+ type2 = TREE_TYPE (op2);
+ code2 = TREE_CODE (type2);
-int
-c_tree_expr_nonnegative_p (t)
- tree t;
-{
- if (TREE_CODE (t) == STMT_EXPR)
+ /* C90 does not permit non-lvalue arrays in conditional expressions.
+ In C99 they will be pointers by now. */
+ if (code1 == ARRAY_TYPE || code2 == ARRAY_TYPE)
{
- t=COMPOUND_BODY (STMT_EXPR_STMT (t));
-
- /* Find the last statement in the chain, ignoring the final
- * scope statement */
- while (TREE_CHAIN (t) != NULL_TREE
- && TREE_CODE (TREE_CHAIN (t)) != SCOPE_STMT)
- t=TREE_CHAIN (t);
- return tree_expr_nonnegative_p (TREE_OPERAND (t, 0));
+ error ("non-lvalue array in conditional expression");
+ return error_mark_node;
}
- return tree_expr_nonnegative_p (t);
-}
-
-/* Return a tree for the difference of pointers OP0 and OP1.
- The resulting tree has type int. */
-
-static tree
-pointer_diff (op0, op1)
- tree op0, op1;
-{
- tree result, folded;
- tree restype = ptrdiff_type_node;
-
- tree target_type = TREE_TYPE (TREE_TYPE (op0));
- tree con0, con1, lit0, lit1;
- tree orig_op1 = op1;
- if (pedantic || warn_pointer_arith)
+ /* Quickly detect the usual case where op1 and op2 have the same type
+ after promotion. */
+ if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2))
{
- if (TREE_CODE (target_type) == VOID_TYPE)
- pedwarn ("pointer of type `void *' used in subtraction");
- if (TREE_CODE (target_type) == FUNCTION_TYPE)
- pedwarn ("pointer to a function used in subtraction");
+ if (type1 == type2)
+ result_type = type1;
+ else
+ result_type = TYPE_MAIN_VARIANT (type1);
}
-
- /* If the conversion to ptrdiff_type does anything like widening or
- converting a partial to an integral mode, we get a convert_expression
- that is in the way to do any simplifications.
- (fold-const.c doesn't know that the extra bits won't be needed.
- split_tree uses STRIP_SIGN_NOPS, which leaves conversions to a
- different mode in place.)
- So first try to find a common term here 'by hand'; we want to cover
- at least the cases that occur in legal static initializers. */
- con0 = TREE_CODE (op0) == NOP_EXPR ? TREE_OPERAND (op0, 0) : op0;
- con1 = TREE_CODE (op1) == NOP_EXPR ? TREE_OPERAND (op1, 0) : op1;
-
- if (TREE_CODE (con0) == PLUS_EXPR)
+ else if ((code1 == INTEGER_TYPE || code1 == REAL_TYPE
+ || code1 == COMPLEX_TYPE)
+ && (code2 == INTEGER_TYPE || code2 == REAL_TYPE
+ || code2 == COMPLEX_TYPE))
{
- lit0 = TREE_OPERAND (con0, 1);
- con0 = TREE_OPERAND (con0, 0);
- }
- else
- lit0 = integer_zero_node;
+ result_type = common_type (type1, type2);
- if (TREE_CODE (con1) == PLUS_EXPR)
- {
- lit1 = TREE_OPERAND (con1, 1);
- con1 = TREE_OPERAND (con1, 0);
- }
- else
- lit1 = integer_zero_node;
+ /* If -Wsign-compare, warn here if type1 and type2 have
+ different signedness. We'll promote the signed to unsigned
+ and later code won't know it used to be different.
+ Do this check on the original types, so that explicit casts
+ will be considered, but default promotions won't. */
+ if (warn_sign_compare && !skip_evaluation)
+ {
+ int unsigned_op1 = TYPE_UNSIGNED (TREE_TYPE (orig_op1));
+ int unsigned_op2 = TYPE_UNSIGNED (TREE_TYPE (orig_op2));
- if (operand_equal_p (con0, con1, 0))
+ if (unsigned_op1 ^ unsigned_op2)
+ {
+ /* Do not warn if the result type is signed, since the
+ signed type will only be chosen if it can represent
+ all the values of the unsigned type. */
+ if (! TYPE_UNSIGNED (result_type))
+ /* OK */;
+ /* Do not warn if the signed quantity is an unsuffixed
+ integer literal (or some static constant expression
+ involving such literals) and it is non-negative. */
+ else if ((unsigned_op2 && c_tree_expr_nonnegative_p (op1))
+ || (unsigned_op1 && c_tree_expr_nonnegative_p (op2)))
+ /* OK */;
+ else
+ warning ("signed and unsigned type in conditional expression");
+ }
+ }
+ }
+ else if (code1 == VOID_TYPE || code2 == VOID_TYPE)
{
- op0 = lit0;
- op1 = lit1;
+ if (pedantic && (code1 != VOID_TYPE || code2 != VOID_TYPE))
+ pedwarn ("ISO C forbids conditional expr with only one void side");
+ result_type = void_type_node;
}
-
-
- /* First do the subtraction as integers;
- then drop through to build the divide operator.
- Do not do default conversions on the minus operator
- in case restype is a short type. */
-
- op0 = build_binary_op (MINUS_EXPR, convert (restype, op0),
- convert (restype, op1), 0);
- /* This generates an error if op1 is pointer to incomplete type. */
- if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (orig_op1))))
- error ("arithmetic on pointer to an incomplete type");
-
- /* This generates an error if op0 is pointer to incomplete type. */
- op1 = c_size_in_bytes (target_type);
-
- /* Divide by the size, in easiest possible way. */
-
- result = build (EXACT_DIV_EXPR, restype, op0, convert (restype, op1));
-
- folded = fold (result);
- if (folded == result)
- TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1);
- return folded;
-}
-\f
-/* Construct and perhaps optimize a tree representation
- for a unary operation. CODE, a tree_code, specifies the operation
- and XARG is the operand.
- For any CODE other than ADDR_EXPR, FLAG nonzero suppresses
- the default promotions (such as from short to int).
- For ADDR_EXPR, the default promotions are not applied; FLAG nonzero
- allows non-lvalues; this is only used to handle conversion of non-lvalue
- arrays to pointers in C99. */
-
-tree
-build_unary_op (code, xarg, flag)
- enum tree_code code;
- tree xarg;
- int flag;
-{
- /* No default_conversion here. It causes trouble for ADDR_EXPR. */
- tree arg = xarg;
- tree argtype = 0;
- enum tree_code typecode = TREE_CODE (TREE_TYPE (arg));
- tree val;
- int noconvert = flag;
-
- if (typecode == ERROR_MARK)
- return error_mark_node;
- if (typecode == ENUMERAL_TYPE || typecode == BOOLEAN_TYPE)
- typecode = INTEGER_TYPE;
-
- switch (code)
+ else if (code1 == POINTER_TYPE && code2 == POINTER_TYPE)
{
- case CONVERT_EXPR:
- /* This is used for unary plus, because a CONVERT_EXPR
- is enough to prevent anybody from looking inside for
- associativity, but won't generate any code. */
- if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
- || typecode == COMPLEX_TYPE))
+ if (comp_target_types (type1, type2, 1))
+ result_type = common_pointer_type (type1, type2);
+ else if (integer_zerop (op1) && TREE_TYPE (type1) == void_type_node
+ && TREE_CODE (orig_op1) != NOP_EXPR)
+ result_type = qualify_type (type2, type1);
+ else if (integer_zerop (op2) && TREE_TYPE (type2) == void_type_node
+ && TREE_CODE (orig_op2) != NOP_EXPR)
+ result_type = qualify_type (type1, type2);
+ else if (VOID_TYPE_P (TREE_TYPE (type1)))
{
- error ("wrong type argument to unary plus");
- return error_mark_node;
+ if (pedantic && TREE_CODE (TREE_TYPE (type2)) == FUNCTION_TYPE)
+ pedwarn ("ISO C forbids conditional expr between `void *' and function pointer");
+ result_type = build_pointer_type (qualify_type (TREE_TYPE (type1),
+ TREE_TYPE (type2)));
}
- else if (!noconvert)
- arg = default_conversion (arg);
- arg = non_lvalue (arg);
- break;
-
- case NEGATE_EXPR:
- if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
- || typecode == COMPLEX_TYPE
- || typecode == VECTOR_TYPE))
+ else if (VOID_TYPE_P (TREE_TYPE (type2)))
{
- error ("wrong type argument to unary minus");
- return error_mark_node;
+ if (pedantic && TREE_CODE (TREE_TYPE (type1)) == FUNCTION_TYPE)
+ pedwarn ("ISO C forbids conditional expr between `void *' and function pointer");
+ result_type = build_pointer_type (qualify_type (TREE_TYPE (type2),
+ TREE_TYPE (type1)));
}
- else if (!noconvert)
- arg = default_conversion (arg);
- break;
-
- case BIT_NOT_EXPR:
- if (typecode == INTEGER_TYPE || typecode == VECTOR_TYPE)
+ else
{
- if (!noconvert)
- arg = default_conversion (arg);
+ pedwarn ("pointer type mismatch in conditional expression");
+ result_type = build_pointer_type (void_type_node);
}
- else if (typecode == COMPLEX_TYPE)
+ }
+ else if (code1 == POINTER_TYPE && code2 == INTEGER_TYPE)
+ {
+ if (! integer_zerop (op2))
+ pedwarn ("pointer/integer type mismatch in conditional expression");
+ else
{
- code = CONJ_EXPR;
- if (pedantic)
- pedwarn ("ISO C does not support `~' for complex conjugation");
- if (!noconvert)
- arg = default_conversion (arg);
+ op2 = null_pointer_node;
}
+ result_type = type1;
+ }
+ else if (code2 == POINTER_TYPE && code1 == INTEGER_TYPE)
+ {
+ if (!integer_zerop (op1))
+ pedwarn ("pointer/integer type mismatch in conditional expression");
else
{
- error ("wrong type argument to bit-complement");
- return error_mark_node;
+ op1 = null_pointer_node;
}
- break;
+ result_type = type2;
+ }
- case ABS_EXPR:
- if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
- || typecode == COMPLEX_TYPE))
+ if (!result_type)
+ {
+ if (flag_cond_mismatch)
+ result_type = void_type_node;
+ else
{
- error ("wrong type argument to abs");
+ error ("type mismatch in conditional expression");
return error_mark_node;
}
- else if (!noconvert)
- arg = default_conversion (arg);
- break;
+ }
- case CONJ_EXPR:
- /* Conjugating a real value is a no-op, but allow it anyway. */
- if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
- || typecode == COMPLEX_TYPE))
- {
- error ("wrong type argument to conjugation");
- return error_mark_node;
- }
- else if (!noconvert)
- arg = default_conversion (arg);
- break;
-
- case TRUTH_NOT_EXPR:
- if (typecode != INTEGER_TYPE
- && typecode != REAL_TYPE && typecode != POINTER_TYPE
- && typecode != COMPLEX_TYPE
- /* These will convert to a pointer. */
- && typecode != ARRAY_TYPE && typecode != FUNCTION_TYPE)
- {
- error ("wrong type argument to unary exclamation mark");
- return error_mark_node;
- }
- arg = c_common_truthvalue_conversion (arg);
- return invert_truthvalue (arg);
-
- case NOP_EXPR:
- break;
-
- case REALPART_EXPR:
- if (TREE_CODE (arg) == COMPLEX_CST)
- return TREE_REALPART (arg);
- else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE)
- return fold (build1 (REALPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg));
- else
- return arg;
-
- case IMAGPART_EXPR:
- if (TREE_CODE (arg) == COMPLEX_CST)
- return TREE_IMAGPART (arg);
- else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE)
- return fold (build1 (IMAGPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg));
- else
- return convert (TREE_TYPE (arg), integer_zero_node);
-
- case PREINCREMENT_EXPR:
- case POSTINCREMENT_EXPR:
- case PREDECREMENT_EXPR:
- case POSTDECREMENT_EXPR:
- /* Handle complex lvalues (when permitted)
- by reduction to simpler cases. */
-
- val = unary_complex_lvalue (code, arg, 0);
- if (val != 0)
- return val;
-
- /* Increment or decrement the real part of the value,
- and don't change the imaginary part. */
- if (typecode == COMPLEX_TYPE)
- {
- tree real, imag;
-
- if (pedantic)
- pedwarn ("ISO C does not support `++' and `--' on complex types");
-
- arg = stabilize_reference (arg);
- real = build_unary_op (REALPART_EXPR, arg, 1);
- imag = build_unary_op (IMAGPART_EXPR, arg, 1);
- return build (COMPLEX_EXPR, TREE_TYPE (arg),
- build_unary_op (code, real, 1), imag);
- }
+ /* Merge const and volatile flags of the incoming types. */
+ result_type
+ = build_type_variant (result_type,
+ TREE_READONLY (op1) || TREE_READONLY (op2),
+ TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2));
- /* Report invalid types. */
+ if (result_type != TREE_TYPE (op1))
+ op1 = convert_and_check (result_type, op1);
+ if (result_type != TREE_TYPE (op2))
+ op2 = convert_and_check (result_type, op2);
- if (typecode != POINTER_TYPE
- && typecode != INTEGER_TYPE && typecode != REAL_TYPE)
- {
- if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR)
- error ("wrong type argument to increment");
- else
- error ("wrong type argument to decrement");
+ if (TREE_CODE (ifexp) == INTEGER_CST)
+ return non_lvalue (integer_zerop (ifexp) ? op2 : op1);
- return error_mark_node;
- }
+ return fold (build (COND_EXPR, result_type, ifexp, op1, op2));
+}
+\f
+/* Given a list of expressions, return a compound expression
+ that performs them all and returns the value of the last of them. */
- {
- tree inc;
- tree result_type = TREE_TYPE (arg);
+tree
+build_compound_expr (tree list)
+{
+ return internal_build_compound_expr (list, TRUE);
+}
- arg = get_unwidened (arg, 0);
- argtype = TREE_TYPE (arg);
+static tree
+internal_build_compound_expr (tree list, int first_p)
+{
+ tree rest;
- /* Compute the increment. */
+ if (TREE_CHAIN (list) == 0)
+ {
+ /* Convert arrays and functions to pointers when there
+ really is a comma operator. */
+ if (!first_p)
+ TREE_VALUE (list)
+ = default_function_array_conversion (TREE_VALUE (list));
- if (typecode == POINTER_TYPE)
- {
- /* If pointer target is an undefined struct,
- we just cannot know how to do the arithmetic. */
- if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (result_type)))
- {
- if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR)
- error ("increment of pointer to unknown structure");
- else
- error ("decrement of pointer to unknown structure");
- }
- else if ((pedantic || warn_pointer_arith)
- && (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE
- || TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE))
- {
- if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR)
- pedwarn ("wrong type argument to increment");
- else
- pedwarn ("wrong type argument to decrement");
- }
+ /* Don't let (0, 0) be null pointer constant. */
+ if (!first_p && integer_zerop (TREE_VALUE (list)))
+ return non_lvalue (TREE_VALUE (list));
+ return TREE_VALUE (list);
+ }
- inc = c_size_in_bytes (TREE_TYPE (result_type));
- }
- else
- inc = integer_one_node;
+ rest = internal_build_compound_expr (TREE_CHAIN (list), FALSE);
- inc = convert (argtype, inc);
+ if (! TREE_SIDE_EFFECTS (TREE_VALUE (list)))
+ {
+ /* The left-hand operand of a comma expression is like an expression
+ statement: with -Wextra or -Wunused, we should warn if it doesn't have
+ any side-effects, unless it was explicitly cast to (void). */
+ if (warn_unused_value
+ && ! (TREE_CODE (TREE_VALUE (list)) == CONVERT_EXPR
+ && VOID_TYPE_P (TREE_TYPE (TREE_VALUE (list)))))
+ warning ("left-hand operand of comma expression has no effect");
+ }
- /* Handle incrementing a cast-expression. */
+ /* With -Wunused, we should also warn if the left-hand operand does have
+ side-effects, but computes a value which is not used. For example, in
+ `foo() + bar(), baz()' the result of the `+' operator is not used,
+ so we should issue a warning. */
+ else if (warn_unused_value)
+ warn_if_unused_value (TREE_VALUE (list));
- while (1)
- switch (TREE_CODE (arg))
- {
- case NOP_EXPR:
- case CONVERT_EXPR:
- case FLOAT_EXPR:
- case FIX_TRUNC_EXPR:
- case FIX_FLOOR_EXPR:
- case FIX_ROUND_EXPR:
- case FIX_CEIL_EXPR:
- pedantic_lvalue_warning (CONVERT_EXPR);
- /* If the real type has the same machine representation
- as the type it is cast to, we can make better output
- by adding directly to the inside of the cast. */
- if ((TREE_CODE (TREE_TYPE (arg))
- == TREE_CODE (TREE_TYPE (TREE_OPERAND (arg, 0))))
- && (TYPE_MODE (TREE_TYPE (arg))
- == TYPE_MODE (TREE_TYPE (TREE_OPERAND (arg, 0)))))
- arg = TREE_OPERAND (arg, 0);
- else
- {
- tree incremented, modify, value;
- if (TREE_CODE (TREE_TYPE (arg)) == BOOLEAN_TYPE)
- value = boolean_increment (code, arg);
- else
- {
- arg = stabilize_reference (arg);
- if (code == PREINCREMENT_EXPR || code == PREDECREMENT_EXPR)
- value = arg;
- else
- value = save_expr (arg);
- incremented = build (((code == PREINCREMENT_EXPR
- || code == POSTINCREMENT_EXPR)
- ? PLUS_EXPR : MINUS_EXPR),
- argtype, value, inc);
- TREE_SIDE_EFFECTS (incremented) = 1;
- modify = build_modify_expr (arg, NOP_EXPR, incremented);
- value = build (COMPOUND_EXPR, TREE_TYPE (arg), modify, value);
- }
- TREE_USED (value) = 1;
- return value;
- }
- break;
+ return build (COMPOUND_EXPR, TREE_TYPE (rest), TREE_VALUE (list), rest);
+}
- default:
- goto give_up;
- }
- give_up:
+/* Build an expression representing a cast to type TYPE of expression EXPR. */
- /* Complain about anything else that is not a true lvalue. */
- if (!lvalue_or_else (arg, ((code == PREINCREMENT_EXPR
- || code == POSTINCREMENT_EXPR)
- ? "invalid lvalue in increment"
- : "invalid lvalue in decrement")))
- return error_mark_node;
+tree
+build_c_cast (tree type, tree expr)
+{
+ tree value = expr;
- /* Report a read-only lvalue. */
- if (TREE_READONLY (arg))
- readonly_warning (arg,
- ((code == PREINCREMENT_EXPR
- || code == POSTINCREMENT_EXPR)
- ? "increment" : "decrement"));
+ if (type == error_mark_node || expr == error_mark_node)
+ return error_mark_node;
- if (TREE_CODE (TREE_TYPE (arg)) == BOOLEAN_TYPE)
- val = boolean_increment (code, arg);
- else
- val = build (code, TREE_TYPE (arg), arg, inc);
- TREE_SIDE_EFFECTS (val) = 1;
- val = convert (result_type, val);
- if (TREE_CODE (val) != code)
- TREE_NO_UNUSED_WARNING (val) = 1;
- return val;
- }
+ /* The ObjC front-end uses TYPE_MAIN_VARIANT to tie together types differing
+ only in <protocol> qualifications. But when constructing cast expressions,
+ the protocols do matter and must be kept around. */
+ if (!c_dialect_objc () || !objc_is_object_ptr (type))
+ type = TYPE_MAIN_VARIANT (type);
- case ADDR_EXPR:
- /* Note that this operation never does default_conversion. */
+ if (TREE_CODE (type) == ARRAY_TYPE)
+ {
+ error ("cast specifies array type");
+ return error_mark_node;
+ }
- /* Let &* cancel out to simplify resulting code. */
- if (TREE_CODE (arg) == INDIRECT_REF)
- {
- /* Don't let this be an lvalue. */
- if (lvalue_p (TREE_OPERAND (arg, 0)))
- return non_lvalue (TREE_OPERAND (arg, 0));
- return TREE_OPERAND (arg, 0);
- }
+ if (TREE_CODE (type) == FUNCTION_TYPE)
+ {
+ error ("cast specifies function type");
+ return error_mark_node;
+ }
- /* For &x[y], return x+y */
- if (TREE_CODE (arg) == ARRAY_REF)
+ if (type == TYPE_MAIN_VARIANT (TREE_TYPE (value)))
+ {
+ if (pedantic)
{
- if (!c_mark_addressable (TREE_OPERAND (arg, 0)))
- return error_mark_node;
- return build_binary_op (PLUS_EXPR, TREE_OPERAND (arg, 0),
- TREE_OPERAND (arg, 1), 1);
+ if (TREE_CODE (type) == RECORD_TYPE
+ || TREE_CODE (type) == UNION_TYPE)
+ pedwarn ("ISO C forbids casting nonscalar to the same type");
}
+ }
+ else if (TREE_CODE (type) == UNION_TYPE)
+ {
+ tree field;
+ value = default_function_array_conversion (value);
- /* Handle complex lvalues (when permitted)
- by reduction to simpler cases. */
- val = unary_complex_lvalue (code, arg, flag);
- if (val != 0)
- return val;
+ for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
+ if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (field)),
+ TYPE_MAIN_VARIANT (TREE_TYPE (value))))
+ break;
-#if 0 /* Turned off because inconsistent;
- float f; *&(int)f = 3.4 stores in int format
- whereas (int)f = 3.4 stores in float format. */
- /* Address of a cast is just a cast of the address
- of the operand of the cast. */
- switch (TREE_CODE (arg))
+ if (field)
{
- case NOP_EXPR:
- case CONVERT_EXPR:
- case FLOAT_EXPR:
- case FIX_TRUNC_EXPR:
- case FIX_FLOOR_EXPR:
- case FIX_ROUND_EXPR:
- case FIX_CEIL_EXPR:
+ tree t;
+
if (pedantic)
- pedwarn ("ISO C forbids the address of a cast expression");
- return convert (build_pointer_type (TREE_TYPE (arg)),
- build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0),
- 0));
+ pedwarn ("ISO C forbids casts to union type");
+ t = digest_init (type,
+ build_constructor (type,
+ build_tree_list (field, value)),
+ 0);
+ TREE_CONSTANT (t) = TREE_CONSTANT (value);
+ TREE_INVARIANT (t) = TREE_INVARIANT (value);
+ return t;
}
-#endif
-
- /* Anything not already handled and not a true memory reference
- or a non-lvalue array is an error. */
- else if (typecode != FUNCTION_TYPE && !flag
- && !lvalue_or_else (arg, "invalid lvalue in unary `&'"))
- return error_mark_node;
+ error ("cast to union type from type not present in union");
+ return error_mark_node;
+ }
+ else
+ {
+ tree otype, ovalue;
- /* Ordinary case; arg is a COMPONENT_REF or a decl. */
- argtype = TREE_TYPE (arg);
+ /* If casting to void, avoid the error that would come
+ from default_conversion in the case of a non-lvalue array. */
+ if (type == void_type_node)
+ return build1 (CONVERT_EXPR, type, value);
- /* If the lvalue is const or volatile, merge that into the type
- to which the address will point. Note that you can't get a
- restricted pointer by taking the address of something, so we
- only have to deal with `const' and `volatile' here. */
- if ((DECL_P (arg) || TREE_CODE_CLASS (TREE_CODE (arg)) == 'r')
- && (TREE_READONLY (arg) || TREE_THIS_VOLATILE (arg)))
- argtype = c_build_type_variant (argtype,
- TREE_READONLY (arg),
- TREE_THIS_VOLATILE (arg));
-
- argtype = build_pointer_type (argtype);
+ /* Convert functions and arrays to pointers,
+ but don't convert any other types. */
+ value = default_function_array_conversion (value);
+ otype = TREE_TYPE (value);
- if (!c_mark_addressable (arg))
- return error_mark_node;
+ /* Optionally warn about potentially worrisome casts. */
- {
- tree addr;
+ if (warn_cast_qual
+ && TREE_CODE (type) == POINTER_TYPE
+ && TREE_CODE (otype) == POINTER_TYPE)
+ {
+ tree in_type = type;
+ tree in_otype = otype;
+ int added = 0;
+ int discarded = 0;
- if (TREE_CODE (arg) == COMPONENT_REF)
- {
- tree field = TREE_OPERAND (arg, 1);
+ /* Check that the qualifiers on IN_TYPE are a superset of
+ the qualifiers of IN_OTYPE. The outermost level of
+ POINTER_TYPE nodes is uninteresting and we stop as soon
+ as we hit a non-POINTER_TYPE node on either type. */
+ do
+ {
+ in_otype = TREE_TYPE (in_otype);
+ in_type = TREE_TYPE (in_type);
- addr = build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0), flag);
+ /* GNU C allows cv-qualified function types. 'const'
+ means the function is very pure, 'volatile' means it
+ can't return. We need to warn when such qualifiers
+ are added, not when they're taken away. */
+ if (TREE_CODE (in_otype) == FUNCTION_TYPE
+ && TREE_CODE (in_type) == FUNCTION_TYPE)
+ added |= (TYPE_QUALS (in_type) & ~TYPE_QUALS (in_otype));
+ else
+ discarded |= (TYPE_QUALS (in_otype) & ~TYPE_QUALS (in_type));
+ }
+ while (TREE_CODE (in_type) == POINTER_TYPE
+ && TREE_CODE (in_otype) == POINTER_TYPE);
- if (DECL_C_BIT_FIELD (field))
- {
- error ("attempt to take address of bit-field structure member `%s'",
- IDENTIFIER_POINTER (DECL_NAME (field)));
- return error_mark_node;
- }
+ if (added)
+ warning ("cast adds new qualifiers to function type");
- addr = fold (build (PLUS_EXPR, argtype,
- convert (argtype, addr),
- convert (argtype, byte_position (field))));
- }
- else
- addr = build1 (code, argtype, arg);
+ if (discarded)
+ /* There are qualifiers present in IN_OTYPE that are not
+ present in IN_TYPE. */
+ warning ("cast discards qualifiers from pointer target type");
+ }
- /* Address of a static or external variable or
- file-scope function counts as a constant. */
- if (staticp (arg)
- && ! (TREE_CODE (arg) == FUNCTION_DECL
- && DECL_CONTEXT (arg) != 0))
- TREE_CONSTANT (addr) = 1;
- return addr;
- }
+ /* Warn about possible alignment problems. */
+ if (STRICT_ALIGNMENT && warn_cast_align
+ && TREE_CODE (type) == POINTER_TYPE
+ && TREE_CODE (otype) == POINTER_TYPE
+ && TREE_CODE (TREE_TYPE (otype)) != VOID_TYPE
+ && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE
+ /* Don't warn about opaque types, where the actual alignment
+ restriction is unknown. */
+ && !((TREE_CODE (TREE_TYPE (otype)) == UNION_TYPE
+ || TREE_CODE (TREE_TYPE (otype)) == RECORD_TYPE)
+ && TYPE_MODE (TREE_TYPE (otype)) == VOIDmode)
+ && TYPE_ALIGN (TREE_TYPE (type)) > TYPE_ALIGN (TREE_TYPE (otype)))
+ warning ("cast increases required alignment of target type");
- default:
- break;
- }
+ if (TREE_CODE (type) == INTEGER_TYPE
+ && TREE_CODE (otype) == POINTER_TYPE
+ && TYPE_PRECISION (type) != TYPE_PRECISION (otype)
+ && !TREE_CONSTANT (value))
+ warning ("cast from pointer to integer of different size");
- if (argtype == 0)
- argtype = TREE_TYPE (arg);
- return fold (build1 (code, argtype, arg));
-}
+ if (warn_bad_function_cast
+ && TREE_CODE (value) == CALL_EXPR
+ && TREE_CODE (type) != TREE_CODE (otype))
+ warning ("cast does not match function type");
-#if 0
-/* If CONVERSIONS is a conversion expression or a nested sequence of such,
- convert ARG with the same conversions in the same order
- and return the result. */
+ if (TREE_CODE (type) == POINTER_TYPE
+ && TREE_CODE (otype) == INTEGER_TYPE
+ && TYPE_PRECISION (type) != TYPE_PRECISION (otype)
+ /* Don't warn about converting any constant. */
+ && !TREE_CONSTANT (value))
+ warning ("cast to pointer from integer of different size");
-static tree
-convert_sequence (conversions, arg)
- tree conversions;
- tree arg;
-{
- switch (TREE_CODE (conversions))
- {
- case NOP_EXPR:
- case CONVERT_EXPR:
- case FLOAT_EXPR:
- case FIX_TRUNC_EXPR:
- case FIX_FLOOR_EXPR:
- case FIX_ROUND_EXPR:
- case FIX_CEIL_EXPR:
- return convert (TREE_TYPE (conversions),
- convert_sequence (TREE_OPERAND (conversions, 0),
- arg));
+ if (TREE_CODE (type) == POINTER_TYPE
+ && TREE_CODE (otype) == POINTER_TYPE
+ && TREE_CODE (expr) == ADDR_EXPR
+ && DECL_P (TREE_OPERAND (expr, 0))
+ && flag_strict_aliasing && warn_strict_aliasing
+ && !VOID_TYPE_P (TREE_TYPE (type)))
+ {
+ /* Casting the address of a decl to non void pointer. Warn
+ if the cast breaks type based aliasing. */
+ if (!COMPLETE_TYPE_P (TREE_TYPE (type)))
+ warning ("type-punning to incomplete type might break strict-aliasing rules");
+ else
+ {
+ HOST_WIDE_INT set1 = get_alias_set (TREE_TYPE (TREE_OPERAND (expr, 0)));
+ HOST_WIDE_INT set2 = get_alias_set (TREE_TYPE (type));
+
+ if (!alias_sets_conflict_p (set1, set2))
+ warning ("dereferencing type-punned pointer will break strict-aliasing rules");
+ else if (warn_strict_aliasing > 1
+ && !alias_sets_might_conflict_p (set1, set2))
+ warning ("dereferencing type-punned pointer might break strict-aliasing rules");
+ }
+ }
- default:
- return arg;
- }
-}
-#endif /* 0 */
+ /* If pedantic, warn for conversions between function and object
+ pointer types, except for converting a null pointer constant
+ to function pointer type. */
+ if (pedantic
+ && TREE_CODE (type) == POINTER_TYPE
+ && TREE_CODE (otype) == POINTER_TYPE
+ && TREE_CODE (TREE_TYPE (otype)) == FUNCTION_TYPE
+ && TREE_CODE (TREE_TYPE (type)) != FUNCTION_TYPE)
+ pedwarn ("ISO C forbids conversion of function pointer to object pointer type");
-/* Return nonzero if REF is an lvalue valid for this language.
- Lvalues can be assigned, unless their type has TYPE_READONLY.
- Lvalues can have their address taken, unless they have DECL_REGISTER. */
+ if (pedantic
+ && TREE_CODE (type) == POINTER_TYPE
+ && TREE_CODE (otype) == POINTER_TYPE
+ && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE
+ && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE
+ && !(integer_zerop (value) && TREE_TYPE (otype) == void_type_node
+ && TREE_CODE (expr) != NOP_EXPR))
+ pedwarn ("ISO C forbids conversion of object pointer to function pointer type");
-int
-lvalue_p (ref)
- tree ref;
-{
- enum tree_code code = TREE_CODE (ref);
+ ovalue = value;
+ /* Replace a nonvolatile const static variable with its value. */
+ if (optimize && TREE_CODE (value) == VAR_DECL)
+ value = decl_constant_value (value);
+ value = convert (type, value);
- switch (code)
- {
- case REALPART_EXPR:
- case IMAGPART_EXPR:
- case COMPONENT_REF:
- return lvalue_p (TREE_OPERAND (ref, 0));
+ /* Ignore any integer overflow caused by the cast. */
+ if (TREE_CODE (value) == INTEGER_CST)
+ {
+ TREE_OVERFLOW (value) = TREE_OVERFLOW (ovalue);
- case COMPOUND_LITERAL_EXPR:
- case STRING_CST:
- return 1;
+ if (TREE_CODE_CLASS (TREE_CODE (ovalue)) == 'c')
+ TREE_CONSTANT_OVERFLOW (value) = TREE_CONSTANT_OVERFLOW (ovalue);
+ }
+ }
- case INDIRECT_REF:
- case ARRAY_REF:
- case VAR_DECL:
- case PARM_DECL:
- case RESULT_DECL:
- case ERROR_MARK:
- return (TREE_CODE (TREE_TYPE (ref)) != FUNCTION_TYPE
- && TREE_CODE (TREE_TYPE (ref)) != METHOD_TYPE);
+ /* Don't let (void *) (FOO *) 0 be a null pointer constant. */
+ if (TREE_CODE (value) == INTEGER_CST
+ && TREE_CODE (expr) == INTEGER_CST
+ && TREE_CODE (TREE_TYPE (expr)) != INTEGER_TYPE)
+ value = non_lvalue (value);
- case BIND_EXPR:
- case RTL_EXPR:
- return TREE_CODE (TREE_TYPE (ref)) == ARRAY_TYPE;
+ /* Don't let a cast be an lvalue. */
+ if (value == expr)
+ value = non_lvalue (value);
- default:
- return 0;
- }
+ return value;
}
-/* Return nonzero if REF is an lvalue valid for this language;
- otherwise, print an error message and return zero. */
-
-int
-lvalue_or_else (ref, msgid)
- tree ref;
- const char *msgid;
+/* Interpret a cast of expression EXPR to type TYPE. */
+tree
+c_cast_expr (tree type, tree expr)
{
- int win = lvalue_p (ref);
+ int saved_wsp = warn_strict_prototypes;
- if (! win)
- error ("%s", msgid);
+ /* This avoids warnings about unprototyped casts on
+ integers. E.g. "#define SIG_DFL (void(*)())0". */
+ if (TREE_CODE (expr) == INTEGER_CST)
+ warn_strict_prototypes = 0;
+ type = groktypename (type);
+ warn_strict_prototypes = saved_wsp;
- return win;
+ return build_c_cast (type, expr);
}
-/* Apply unary lvalue-demanding operator CODE to the expression ARG
- for certain kinds of expressions which are not really lvalues
- but which we can accept as lvalues. If FLAG is nonzero, then
- non-lvalues are OK since we may be converting a non-lvalue array to
- a pointer in C99.
+\f
+/* Build an assignment expression of lvalue LHS from value RHS.
+ MODIFYCODE is the code for a binary operator that we use
+ to combine the old value of LHS with RHS to get the new value.
+ Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment. */
- If ARG is not a kind of expression we can handle, return zero. */
-
-static tree
-unary_complex_lvalue (code, arg, flag)
- enum tree_code code;
- tree arg;
- int flag;
+tree
+build_modify_expr (tree lhs, enum tree_code modifycode, tree rhs)
{
- /* Handle (a, b) used as an "lvalue". */
- if (TREE_CODE (arg) == COMPOUND_EXPR)
- {
- tree real_result = build_unary_op (code, TREE_OPERAND (arg, 1), 0);
-
- /* If this returns a function type, it isn't really being used as
- an lvalue, so don't issue a warning about it. */
- if (TREE_CODE (TREE_TYPE (arg)) != FUNCTION_TYPE && !flag)
- pedantic_lvalue_warning (COMPOUND_EXPR);
-
- return build (COMPOUND_EXPR, TREE_TYPE (real_result),
- TREE_OPERAND (arg, 0), real_result);
- }
+ tree result;
+ tree newrhs;
+ tree lhstype = TREE_TYPE (lhs);
+ tree olhstype = lhstype;
- /* Handle (a ? b : c) used as an "lvalue". */
- if (TREE_CODE (arg) == COND_EXPR)
- {
- if (!flag)
- pedantic_lvalue_warning (COND_EXPR);
- if (TREE_CODE (TREE_TYPE (arg)) != FUNCTION_TYPE && !flag)
- pedantic_lvalue_warning (COMPOUND_EXPR);
+ /* Types that aren't fully specified cannot be used in assignments. */
+ lhs = require_complete_type (lhs);
- return (build_conditional_expr
- (TREE_OPERAND (arg, 0),
- build_unary_op (code, TREE_OPERAND (arg, 1), flag),
- build_unary_op (code, TREE_OPERAND (arg, 2), flag)));
- }
+ /* Avoid duplicate error messages from operands that had errors. */
+ if (TREE_CODE (lhs) == ERROR_MARK || TREE_CODE (rhs) == ERROR_MARK)
+ return error_mark_node;
- return 0;
-}
+ /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
+ /* Do not use STRIP_NOPS here. We do not want an enumerator
+ whose value is 0 to count as a null pointer constant. */
+ if (TREE_CODE (rhs) == NON_LVALUE_EXPR)
+ rhs = TREE_OPERAND (rhs, 0);
-/* If pedantic, warn about improper lvalue. CODE is either COND_EXPR
- COMPOUND_EXPR, or CONVERT_EXPR (for casts). */
+ newrhs = rhs;
-static void
-pedantic_lvalue_warning (code)
- enum tree_code code;
-{
- if (pedantic)
- switch (code)
- {
- case COND_EXPR:
- pedwarn ("ISO C forbids use of conditional expressions as lvalues");
- break;
- case COMPOUND_EXPR:
- pedwarn ("ISO C forbids use of compound expressions as lvalues");
- break;
- default:
- pedwarn ("ISO C forbids use of cast expressions as lvalues");
- break;
- }
-}
-\f
-/* Warn about storing in something that is `const'. */
+ /* If a binary op has been requested, combine the old LHS value with the RHS
+ producing the value we should actually store into the LHS. */
-void
-readonly_warning (arg, msgid)
- tree arg;
- const char *msgid;
-{
- if (TREE_CODE (arg) == COMPONENT_REF)
+ if (modifycode != NOP_EXPR)
{
- if (TYPE_READONLY (TREE_TYPE (TREE_OPERAND (arg, 0))))
- readonly_warning (TREE_OPERAND (arg, 0), msgid);
- else
- pedwarn ("%s of read-only member `%s'", _(msgid),
- IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (arg, 1))));
+ lhs = stabilize_reference (lhs);
+ newrhs = build_binary_op (modifycode, lhs, rhs, 1);
}
- else if (TREE_CODE (arg) == VAR_DECL)
- pedwarn ("%s of read-only variable `%s'", _(msgid),
- IDENTIFIER_POINTER (DECL_NAME (arg)));
- else
- pedwarn ("%s of read-only location", _(msgid));
-}
-\f
-/* Mark EXP saying that we need to be able to take the
- address of it; it should not be allocated in a register.
- Returns true if successful. */
-bool
-c_mark_addressable (exp)
- tree exp;
-{
- tree x = exp;
+ if (!lvalue_or_else (lhs, "invalid lvalue in assignment"))
+ return error_mark_node;
- while (1)
- switch (TREE_CODE (x))
- {
- case COMPONENT_REF:
- if (DECL_C_BIT_FIELD (TREE_OPERAND (x, 1)))
- {
- error ("cannot take address of bit-field `%s'",
- IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (x, 1))));
- return false;
- }
+ /* Warn about storing in something that is `const'. */
- /* ... fall through ... */
+ if (TREE_READONLY (lhs) || TYPE_READONLY (lhstype)
+ || ((TREE_CODE (lhstype) == RECORD_TYPE
+ || TREE_CODE (lhstype) == UNION_TYPE)
+ && C_TYPE_FIELDS_READONLY (lhstype)))
+ readonly_error (lhs, "assignment");
- case ADDR_EXPR:
- case ARRAY_REF:
- case REALPART_EXPR:
- case IMAGPART_EXPR:
- x = TREE_OPERAND (x, 0);
- break;
+ /* If storing into a structure or union member,
+ it has probably been given type `int'.
+ Compute the type that would go with
+ the actual amount of storage the member occupies. */
- case COMPOUND_LITERAL_EXPR:
- case CONSTRUCTOR:
- TREE_ADDRESSABLE (x) = 1;
- return true;
+ if (TREE_CODE (lhs) == COMPONENT_REF
+ && (TREE_CODE (lhstype) == INTEGER_TYPE
+ || TREE_CODE (lhstype) == BOOLEAN_TYPE
+ || TREE_CODE (lhstype) == REAL_TYPE
+ || TREE_CODE (lhstype) == ENUMERAL_TYPE))
+ lhstype = TREE_TYPE (get_unwidened (lhs, 0));
- case VAR_DECL:
- case CONST_DECL:
- case PARM_DECL:
- case RESULT_DECL:
- if (DECL_REGISTER (x) && !TREE_ADDRESSABLE (x)
- && DECL_NONLOCAL (x))
- {
- if (TREE_PUBLIC (x))
- {
- error ("global register variable `%s' used in nested function",
- IDENTIFIER_POINTER (DECL_NAME (x)));
- return false;
- }
- pedwarn ("register variable `%s' used in nested function",
- IDENTIFIER_POINTER (DECL_NAME (x)));
- }
- else if (DECL_REGISTER (x) && !TREE_ADDRESSABLE (x))
- {
- if (TREE_PUBLIC (x))
- {
- error ("address of global register variable `%s' requested",
- IDENTIFIER_POINTER (DECL_NAME (x)));
- return false;
- }
+ /* If storing in a field that is in actuality a short or narrower than one,
+ we must store in the field in its actual type. */
- /* If we are making this addressable due to its having
- volatile components, give a different error message. Also
- handle the case of an unnamed parameter by not trying
- to give the name. */
+ if (lhstype != TREE_TYPE (lhs))
+ {
+ lhs = copy_node (lhs);
+ TREE_TYPE (lhs) = lhstype;
+ }
- else if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (x)))
- {
- error ("cannot put object with volatile field into register");
- return false;
- }
+ /* Convert new value to destination type. */
- pedwarn ("address of register variable `%s' requested",
- IDENTIFIER_POINTER (DECL_NAME (x)));
- }
- put_var_into_stack (x);
+ newrhs = convert_for_assignment (lhstype, newrhs, _("assignment"),
+ NULL_TREE, NULL_TREE, 0);
+ if (TREE_CODE (newrhs) == ERROR_MARK)
+ return error_mark_node;
- /* drops in */
- case FUNCTION_DECL:
- TREE_ADDRESSABLE (x) = 1;
-#if 0 /* poplevel deals with this now. */
- if (DECL_CONTEXT (x) == 0)
- TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (x)) = 1;
-#endif
+ /* Scan operands */
- default:
- return true;
- }
-}
-\f
-/* Build and return a conditional expression IFEXP ? OP1 : OP2. */
+ result = build (MODIFY_EXPR, lhstype, lhs, newrhs);
+ TREE_SIDE_EFFECTS (result) = 1;
-tree
-build_conditional_expr (ifexp, op1, op2)
- tree ifexp, op1, op2;
-{
- tree type1;
- tree type2;
- enum tree_code code1;
- enum tree_code code2;
- tree result_type = NULL;
- tree orig_op1 = op1, orig_op2 = op2;
+ /* If we got the LHS in a different type for storing in,
+ convert the result back to the nominal type of LHS
+ so that the value we return always has the same type
+ as the LHS argument. */
- ifexp = c_common_truthvalue_conversion (default_conversion (ifexp));
+ if (olhstype == TREE_TYPE (result))
+ return result;
+ return convert_for_assignment (olhstype, result, _("assignment"),
+ NULL_TREE, NULL_TREE, 0);
+}
+\f
+/* Convert value RHS to type TYPE as preparation for an assignment
+ to an lvalue of type TYPE.
+ The real work of conversion is done by `convert'.
+ The purpose of this function is to generate error messages
+ for assignments that are not allowed in C.
+ ERRTYPE is a string to use in error messages:
+ "assignment", "return", etc. If it is null, this is parameter passing
+ for a function call (and different error messages are output).
-#if 0 /* Produces wrong result if within sizeof. */
- /* Don't promote the operands separately if they promote
- the same way. Return the unpromoted type and let the combined
- value get promoted if necessary. */
+ FUNNAME is the name of the function being called,
+ as an IDENTIFIER_NODE, or null.
+ PARMNUM is the number of the argument, for printing in error messages. */
- if (TREE_TYPE (op1) == TREE_TYPE (op2)
- && TREE_CODE (TREE_TYPE (op1)) != ARRAY_TYPE
- && TREE_CODE (TREE_TYPE (op1)) != ENUMERAL_TYPE
- && TREE_CODE (TREE_TYPE (op1)) != FUNCTION_TYPE)
- {
- if (TREE_CODE (ifexp) == INTEGER_CST)
- return pedantic_non_lvalue (integer_zerop (ifexp) ? op2 : op1);
+static tree
+convert_for_assignment (tree type, tree rhs, const char *errtype,
+ tree fundecl, tree funname, int parmnum)
+{
+ enum tree_code codel = TREE_CODE (type);
+ tree rhstype;
+ enum tree_code coder;
- return fold (build (COND_EXPR, TREE_TYPE (op1), ifexp, op1, op2));
- }
-#endif
+ /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
+ /* Do not use STRIP_NOPS here. We do not want an enumerator
+ whose value is 0 to count as a null pointer constant. */
+ if (TREE_CODE (rhs) == NON_LVALUE_EXPR)
+ rhs = TREE_OPERAND (rhs, 0);
- /* Promote both alternatives. */
+ if (TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE
+ || TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE)
+ rhs = default_conversion (rhs);
+ else if (optimize && TREE_CODE (rhs) == VAR_DECL)
+ rhs = decl_constant_value_for_broken_optimization (rhs);
- if (TREE_CODE (TREE_TYPE (op1)) != VOID_TYPE)
- op1 = default_conversion (op1);
- if (TREE_CODE (TREE_TYPE (op2)) != VOID_TYPE)
- op2 = default_conversion (op2);
+ rhstype = TREE_TYPE (rhs);
+ coder = TREE_CODE (rhstype);
- if (TREE_CODE (ifexp) == ERROR_MARK
- || TREE_CODE (TREE_TYPE (op1)) == ERROR_MARK
- || TREE_CODE (TREE_TYPE (op2)) == ERROR_MARK)
+ if (coder == ERROR_MARK)
return error_mark_node;
- type1 = TREE_TYPE (op1);
- code1 = TREE_CODE (type1);
- type2 = TREE_TYPE (op2);
- code2 = TREE_CODE (type2);
-
- /* Quickly detect the usual case where op1 and op2 have the same type
- after promotion. */
- if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2))
+ if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype))
{
- if (type1 == type2)
- result_type = type1;
- else
- result_type = TYPE_MAIN_VARIANT (type1);
+ overflow_warning (rhs);
+ /* Check for Objective-C protocols. This will automatically
+ issue a warning if there are protocol violations. No need to
+ use the return value. */
+ if (c_dialect_objc ())
+ objc_comptypes (type, rhstype, 0);
+ return rhs;
}
- else if ((code1 == INTEGER_TYPE || code1 == REAL_TYPE
- || code1 == COMPLEX_TYPE)
- && (code2 == INTEGER_TYPE || code2 == REAL_TYPE
- || code2 == COMPLEX_TYPE))
- {
- result_type = common_type (type1, type2);
-
- /* If -Wsign-compare, warn here if type1 and type2 have
- different signedness. We'll promote the signed to unsigned
- and later code won't know it used to be different.
- Do this check on the original types, so that explicit casts
- will be considered, but default promotions won't. */
- if ((warn_sign_compare < 0 ? extra_warnings : warn_sign_compare)
- && !skip_evaluation)
- {
- int unsigned_op1 = TREE_UNSIGNED (TREE_TYPE (orig_op1));
- int unsigned_op2 = TREE_UNSIGNED (TREE_TYPE (orig_op2));
- if (unsigned_op1 ^ unsigned_op2)
- {
- /* Do not warn if the result type is signed, since the
- signed type will only be chosen if it can represent
- all the values of the unsigned type. */
- if (! TREE_UNSIGNED (result_type))
- /* OK */;
- /* Do not warn if the signed quantity is an unsuffixed
- integer literal (or some static constant expression
- involving such literals) and it is non-negative. */
- else if ((unsigned_op2 && c_tree_expr_nonnegative_p (op1))
- || (unsigned_op1 && c_tree_expr_nonnegative_p (op2)))
- /* OK */;
- else
- warning ("signed and unsigned type in conditional expression");
- }
- }
- }
- else if (code1 == VOID_TYPE || code2 == VOID_TYPE)
+ if (coder == VOID_TYPE)
{
- if (pedantic && (code1 != VOID_TYPE || code2 != VOID_TYPE))
- pedwarn ("ISO C forbids conditional expr with only one void side");
- result_type = void_type_node;
+ error ("void value not ignored as it ought to be");
+ return error_mark_node;
}
- else if (code1 == POINTER_TYPE && code2 == POINTER_TYPE)
+ /* A type converts to a reference to it.
+ This code doesn't fully support references, it's just for the
+ special case of va_start and va_copy. */
+ if (codel == REFERENCE_TYPE
+ && comptypes (TREE_TYPE (type), TREE_TYPE (rhs)) == 1)
{
- if (comp_target_types (type1, type2, 1))
- result_type = common_type (type1, type2);
- else if (integer_zerop (op1) && TREE_TYPE (type1) == void_type_node
- && TREE_CODE (orig_op1) != NOP_EXPR)
- result_type = qualify_type (type2, type1);
- else if (integer_zerop (op2) && TREE_TYPE (type2) == void_type_node
- && TREE_CODE (orig_op2) != NOP_EXPR)
- result_type = qualify_type (type1, type2);
- else if (VOID_TYPE_P (TREE_TYPE (type1)))
- {
- if (pedantic && TREE_CODE (TREE_TYPE (type2)) == FUNCTION_TYPE)
- pedwarn ("ISO C forbids conditional expr between `void *' and function pointer");
- result_type = build_pointer_type (qualify_type (TREE_TYPE (type1),
- TREE_TYPE (type2)));
- }
- else if (VOID_TYPE_P (TREE_TYPE (type2)))
- {
- if (pedantic && TREE_CODE (TREE_TYPE (type1)) == FUNCTION_TYPE)
- pedwarn ("ISO C forbids conditional expr between `void *' and function pointer");
- result_type = build_pointer_type (qualify_type (TREE_TYPE (type2),
- TREE_TYPE (type1)));
- }
- else
+ if (!lvalue_p (rhs))
{
- pedwarn ("pointer type mismatch in conditional expression");
- result_type = build_pointer_type (void_type_node);
+ error ("cannot pass rvalue to reference parameter");
+ return error_mark_node;
}
+ if (!c_mark_addressable (rhs))
+ return error_mark_node;
+ rhs = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (rhs)), rhs);
+
+ /* We already know that these two types are compatible, but they
+ may not be exactly identical. In fact, `TREE_TYPE (type)' is
+ likely to be __builtin_va_list and `TREE_TYPE (rhs)' is
+ likely to be va_list, a typedef to __builtin_va_list, which
+ is different enough that it will cause problems later. */
+ if (TREE_TYPE (TREE_TYPE (rhs)) != TREE_TYPE (type))
+ rhs = build1 (NOP_EXPR, build_pointer_type (TREE_TYPE (type)), rhs);
+
+ rhs = build1 (NOP_EXPR, type, rhs);
+ return rhs;
}
- else if (code1 == POINTER_TYPE && code2 == INTEGER_TYPE)
+ /* Some types can interconvert without explicit casts. */
+ else if (codel == VECTOR_TYPE
+ && vector_types_convertible_p (type, TREE_TYPE (rhs)))
+ return convert (type, rhs);
+ /* Arithmetic types all interconvert, and enum is treated like int. */
+ else if ((codel == INTEGER_TYPE || codel == REAL_TYPE
+ || codel == ENUMERAL_TYPE || codel == COMPLEX_TYPE
+ || codel == BOOLEAN_TYPE)
+ && (coder == INTEGER_TYPE || coder == REAL_TYPE
+ || coder == ENUMERAL_TYPE || coder == COMPLEX_TYPE
+ || coder == BOOLEAN_TYPE))
+ return convert_and_check (type, rhs);
+
+ /* Conversion to a transparent union from its member types.
+ This applies only to function arguments. */
+ else if (codel == UNION_TYPE && TYPE_TRANSPARENT_UNION (type) && ! errtype)
{
- if (! integer_zerop (op2))
- pedwarn ("pointer/integer type mismatch in conditional expression");
- else
- {
- op2 = null_pointer_node;
- }
- result_type = type1;
- }
- else if (code2 == POINTER_TYPE && code1 == INTEGER_TYPE)
- {
- if (!integer_zerop (op1))
- pedwarn ("pointer/integer type mismatch in conditional expression");
- else
- {
- op1 = null_pointer_node;
- }
- result_type = type2;
- }
+ tree memb_types;
+ tree marginal_memb_type = 0;
- if (!result_type)
- {
- if (flag_cond_mismatch)
- result_type = void_type_node;
- else
+ for (memb_types = TYPE_FIELDS (type); memb_types;
+ memb_types = TREE_CHAIN (memb_types))
{
- error ("type mismatch in conditional expression");
- return error_mark_node;
- }
- }
+ tree memb_type = TREE_TYPE (memb_types);
- /* Merge const and volatile flags of the incoming types. */
- result_type
- = build_type_variant (result_type,
- TREE_READONLY (op1) || TREE_READONLY (op2),
- TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2));
+ if (comptypes (TYPE_MAIN_VARIANT (memb_type),
+ TYPE_MAIN_VARIANT (rhstype)))
+ break;
- if (result_type != TREE_TYPE (op1))
- op1 = convert_and_check (result_type, op1);
- if (result_type != TREE_TYPE (op2))
- op2 = convert_and_check (result_type, op2);
-
- if (TREE_CODE (ifexp) == INTEGER_CST)
- return pedantic_non_lvalue (integer_zerop (ifexp) ? op2 : op1);
+ if (TREE_CODE (memb_type) != POINTER_TYPE)
+ continue;
- return fold (build (COND_EXPR, result_type, ifexp, op1, op2));
-}
-\f
-/* Given a list of expressions, return a compound expression
- that performs them all and returns the value of the last of them. */
+ if (coder == POINTER_TYPE)
+ {
+ tree ttl = TREE_TYPE (memb_type);
+ tree ttr = TREE_TYPE (rhstype);
-tree
-build_compound_expr (list)
- tree list;
-{
- return internal_build_compound_expr (list, TRUE);
-}
+ /* Any non-function converts to a [const][volatile] void *
+ and vice versa; otherwise, targets must be the same.
+ Meanwhile, the lhs target must have all the qualifiers of
+ the rhs. */
+ if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr)
+ || comp_target_types (memb_type, rhstype, 0))
+ {
+ /* If this type won't generate any warnings, use it. */
+ if (TYPE_QUALS (ttl) == TYPE_QUALS (ttr)
+ || ((TREE_CODE (ttr) == FUNCTION_TYPE
+ && TREE_CODE (ttl) == FUNCTION_TYPE)
+ ? ((TYPE_QUALS (ttl) | TYPE_QUALS (ttr))
+ == TYPE_QUALS (ttr))
+ : ((TYPE_QUALS (ttl) | TYPE_QUALS (ttr))
+ == TYPE_QUALS (ttl))))
+ break;
-static tree
-internal_build_compound_expr (list, first_p)
- tree list;
- int first_p;
-{
- tree rest;
+ /* Keep looking for a better type, but remember this one. */
+ if (! marginal_memb_type)
+ marginal_memb_type = memb_type;
+ }
+ }
- if (TREE_CHAIN (list) == 0)
- {
- /* Convert arrays and functions to pointers when there
- really is a comma operator. */
- if (!first_p)
- TREE_VALUE (list)
- = default_function_array_conversion (TREE_VALUE (list));
+ /* Can convert integer zero to any pointer type. */
+ if (integer_zerop (rhs)
+ || (TREE_CODE (rhs) == NOP_EXPR
+ && integer_zerop (TREE_OPERAND (rhs, 0))))
+ {
+ rhs = null_pointer_node;
+ break;
+ }
+ }
-#if 0 /* If something inside inhibited lvalueness, we should not override. */
- /* Consider (x, y+0), which is not an lvalue since y+0 is not. */
+ if (memb_types || marginal_memb_type)
+ {
+ if (! memb_types)
+ {
+ /* We have only a marginally acceptable member type;
+ it needs a warning. */
+ tree ttl = TREE_TYPE (marginal_memb_type);
+ tree ttr = TREE_TYPE (rhstype);
- /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
- if (TREE_CODE (list) == NON_LVALUE_EXPR)
- list = TREE_OPERAND (list, 0);
-#endif
+ /* Const and volatile mean something different for function
+ types, so the usual warnings are not appropriate. */
+ if (TREE_CODE (ttr) == FUNCTION_TYPE
+ && TREE_CODE (ttl) == FUNCTION_TYPE)
+ {
+ /* Because const and volatile on functions are
+ restrictions that say the function will not do
+ certain things, it is okay to use a const or volatile
+ function where an ordinary one is wanted, but not
+ vice-versa. */
+ if (TYPE_QUALS (ttl) & ~TYPE_QUALS (ttr))
+ warn_for_assignment ("%s makes qualified function pointer from unqualified",
+ errtype, funname, parmnum);
+ }
+ else if (TYPE_QUALS (ttr) & ~TYPE_QUALS (ttl))
+ warn_for_assignment ("%s discards qualifiers from pointer target type",
+ errtype, funname,
+ parmnum);
+ }
- /* Don't let (0, 0) be null pointer constant. */
- if (!first_p && integer_zerop (TREE_VALUE (list)))
- return non_lvalue (TREE_VALUE (list));
- return TREE_VALUE (list);
+ if (pedantic && ! DECL_IN_SYSTEM_HEADER (fundecl))
+ pedwarn ("ISO C prohibits argument conversion to union type");
+
+ return build1 (NOP_EXPR, type, rhs);
+ }
}
- rest = internal_build_compound_expr (TREE_CHAIN (list), FALSE);
+ /* Conversions among pointers */
+ else if ((codel == POINTER_TYPE || codel == REFERENCE_TYPE)
+ && (coder == codel))
+ {
+ tree ttl = TREE_TYPE (type);
+ tree ttr = TREE_TYPE (rhstype);
+ bool is_opaque_pointer;
+ int target_cmp = 0; /* Cache comp_target_types () result. */
- if (! TREE_SIDE_EFFECTS (TREE_VALUE (list)))
+ /* Opaque pointers are treated like void pointers. */
+ is_opaque_pointer = (targetm.vector_opaque_p (type)
+ || targetm.vector_opaque_p (rhstype))
+ && TREE_CODE (ttl) == VECTOR_TYPE
+ && TREE_CODE (ttr) == VECTOR_TYPE;
+
+ /* Any non-function converts to a [const][volatile] void *
+ and vice versa; otherwise, targets must be the same.
+ Meanwhile, the lhs target must have all the qualifiers of the rhs. */
+ if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr)
+ || (target_cmp = comp_target_types (type, rhstype, 0))
+ || is_opaque_pointer
+ || (c_common_unsigned_type (TYPE_MAIN_VARIANT (ttl))
+ == c_common_unsigned_type (TYPE_MAIN_VARIANT (ttr))))
+ {
+ if (pedantic
+ && ((VOID_TYPE_P (ttl) && TREE_CODE (ttr) == FUNCTION_TYPE)
+ ||
+ (VOID_TYPE_P (ttr)
+ /* Check TREE_CODE to catch cases like (void *) (char *) 0
+ which are not ANSI null ptr constants. */
+ && (!integer_zerop (rhs) || TREE_CODE (rhs) == NOP_EXPR)
+ && TREE_CODE (ttl) == FUNCTION_TYPE)))
+ warn_for_assignment ("ISO C forbids %s between function pointer and `void *'",
+ errtype, funname, parmnum);
+ /* Const and volatile mean something different for function types,
+ so the usual warnings are not appropriate. */
+ else if (TREE_CODE (ttr) != FUNCTION_TYPE
+ && TREE_CODE (ttl) != FUNCTION_TYPE)
+ {
+ if (TYPE_QUALS (ttr) & ~TYPE_QUALS (ttl))
+ warn_for_assignment ("%s discards qualifiers from pointer target type",
+ errtype, funname, parmnum);
+ /* If this is not a case of ignoring a mismatch in signedness,
+ no warning. */
+ else if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr)
+ || target_cmp)
+ ;
+ /* If there is a mismatch, do warn. */
+ else if (pedantic)
+ warn_for_assignment ("pointer targets in %s differ in signedness",
+ errtype, funname, parmnum);
+ }
+ else if (TREE_CODE (ttl) == FUNCTION_TYPE
+ && TREE_CODE (ttr) == FUNCTION_TYPE)
+ {
+ /* Because const and volatile on functions are restrictions
+ that say the function will not do certain things,
+ it is okay to use a const or volatile function
+ where an ordinary one is wanted, but not vice-versa. */
+ if (TYPE_QUALS (ttl) & ~TYPE_QUALS (ttr))
+ warn_for_assignment ("%s makes qualified function pointer from unqualified",
+ errtype, funname, parmnum);
+ }
+ }
+ else
+ warn_for_assignment ("%s from incompatible pointer type",
+ errtype, funname, parmnum);
+ return convert (type, rhs);
+ }
+ else if (codel == POINTER_TYPE && coder == ARRAY_TYPE)
{
- /* The left-hand operand of a comma expression is like an expression
- statement: with -Wextra or -Wunused, we should warn if it doesn't have
- any side-effects, unless it was explicitly cast to (void). */
- if ((extra_warnings || warn_unused_value)
- && ! (TREE_CODE (TREE_VALUE (list)) == CONVERT_EXPR
- && VOID_TYPE_P (TREE_TYPE (TREE_VALUE (list)))))
- warning ("left-hand operand of comma expression has no effect");
+ error ("invalid use of non-lvalue array");
+ return error_mark_node;
+ }
+ else if (codel == POINTER_TYPE && coder == INTEGER_TYPE)
+ {
+ /* An explicit constant 0 can convert to a pointer,
+ or one that results from arithmetic, even including
+ a cast to integer type. */
+ if (! (TREE_CODE (rhs) == INTEGER_CST && integer_zerop (rhs))
+ &&
+ ! (TREE_CODE (rhs) == NOP_EXPR
+ && TREE_CODE (TREE_TYPE (rhs)) == INTEGER_TYPE
+ && TREE_CODE (TREE_OPERAND (rhs, 0)) == INTEGER_CST
+ && integer_zerop (TREE_OPERAND (rhs, 0))))
+ warn_for_assignment ("%s makes pointer from integer without a cast",
+ errtype, funname, parmnum);
- /* When pedantic, a compound expression can be neither an lvalue
- nor an integer constant expression. */
- if (! pedantic)
- return rest;
+ return convert (type, rhs);
+ }
+ else if (codel == INTEGER_TYPE && coder == POINTER_TYPE)
+ {
+ warn_for_assignment ("%s makes integer from pointer without a cast",
+ errtype, funname, parmnum);
+ return convert (type, rhs);
}
+ else if (codel == BOOLEAN_TYPE && coder == POINTER_TYPE)
+ return convert (type, rhs);
- /* With -Wunused, we should also warn if the left-hand operand does have
- side-effects, but computes a value which is not used. For example, in
- `foo() + bar(), baz()' the result of the `+' operator is not used,
- so we should issue a warning. */
- else if (warn_unused_value)
- warn_if_unused_value (TREE_VALUE (list));
+ if (!errtype)
+ {
+ if (funname)
+ {
+ tree selector = objc_message_selector ();
- return build (COMPOUND_EXPR, TREE_TYPE (rest), TREE_VALUE (list), rest);
+ if (selector && parmnum > 2)
+ error ("incompatible type for argument %d of `%s'",
+ parmnum - 2, IDENTIFIER_POINTER (selector));
+ else
+ error ("incompatible type for argument %d of `%s'",
+ parmnum, IDENTIFIER_POINTER (funname));
+ }
+ else
+ error ("incompatible type for argument %d of indirect function call",
+ parmnum);
+ }
+ else
+ error ("incompatible types in %s", errtype);
+
+ return error_mark_node;
}
-/* Build an expression representing a cast to type TYPE of expression EXPR. */
+/* Convert VALUE for assignment into inlined parameter PARM. ARGNUM
+ is used for error and waring reporting and indicates which argument
+ is being processed. */
tree
-build_c_cast (type, expr)
- tree type;
- tree expr;
+c_convert_parm_for_inlining (tree parm, tree value, tree fn, int argnum)
{
- tree value = expr;
-
- if (type == error_mark_node || expr == error_mark_node)
- return error_mark_node;
+ tree ret, type;
- /* The ObjC front-end uses TYPE_MAIN_VARIANT to tie together types differing
- only in <protocol> qualifications. But when constructing cast expressions,
- the protocols do matter and must be kept around. */
- if (!flag_objc || !objc_is_id (type))
- type = TYPE_MAIN_VARIANT (type);
+ /* If FN was prototyped, the value has been converted already
+ in convert_arguments. */
+ if (! value || TYPE_ARG_TYPES (TREE_TYPE (fn)))
+ return value;
-#if 0
- /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
- if (TREE_CODE (value) == NON_LVALUE_EXPR)
- value = TREE_OPERAND (value, 0);
-#endif
+ type = TREE_TYPE (parm);
+ ret = convert_for_assignment (type, value,
+ (char *) 0 /* arg passing */, fn,
+ DECL_NAME (fn), argnum);
+ if (targetm.calls.promote_prototypes (TREE_TYPE (fn))
+ && INTEGRAL_TYPE_P (type)
+ && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)))
+ ret = default_conversion (ret);
+ return ret;
+}
- if (TREE_CODE (type) == ARRAY_TYPE)
- {
- error ("cast specifies array type");
- return error_mark_node;
- }
+/* Print a warning using MSGID.
+ It gets OPNAME as its one parameter.
+ if OPNAME is null and ARGNUM is 0, it is replaced by "passing arg of `FUNCTION'".
+ Otherwise if OPNAME is null, it is replaced by "passing arg ARGNUM of `FUNCTION'".
+ FUNCTION and ARGNUM are handled specially if we are building an
+ Objective-C selector. */
- if (TREE_CODE (type) == FUNCTION_TYPE)
+static void
+warn_for_assignment (const char *msgid, const char *opname, tree function,
+ int argnum)
+{
+ if (opname == 0)
{
- error ("cast specifies function type");
- return error_mark_node;
- }
+ tree selector = objc_message_selector ();
+ char * new_opname;
- if (type == TYPE_MAIN_VARIANT (TREE_TYPE (value)))
- {
- if (pedantic)
+ if (selector && argnum > 2)
{
- if (TREE_CODE (type) == RECORD_TYPE
- || TREE_CODE (type) == UNION_TYPE)
- pedwarn ("ISO C forbids casting nonscalar to the same type");
+ function = selector;
+ argnum -= 2;
+ }
+ if (argnum == 0)
+ {
+ if (function)
+ {
+ /* Function name is known; supply it. */
+ const char *const argstring = _("passing arg of `%s'");
+ new_opname = alloca (IDENTIFIER_LENGTH (function)
+ + strlen (argstring) + 1 + 1);
+ sprintf (new_opname, argstring,
+ IDENTIFIER_POINTER (function));
+ }
+ else
+ {
+ /* Function name unknown (call through ptr). */
+ const char *const argnofun = _("passing arg of pointer to function");
+ new_opname = alloca (strlen (argnofun) + 1 + 1);
+ sprintf (new_opname, argnofun);
+ }
+ }
+ else if (function)
+ {
+ /* Function name is known; supply it. */
+ const char *const argstring = _("passing arg %d of `%s'");
+ new_opname = alloca (IDENTIFIER_LENGTH (function)
+ + strlen (argstring) + 1 + 25 /*%d*/ + 1);
+ sprintf (new_opname, argstring, argnum,
+ IDENTIFIER_POINTER (function));
+ }
+ else
+ {
+ /* Function name unknown (call through ptr); just give arg number. */
+ const char *const argnofun = _("passing arg %d of pointer to function");
+ new_opname = alloca (strlen (argnofun) + 1 + 25 /*%d*/ + 1);
+ sprintf (new_opname, argnofun, argnum);
}
+ opname = new_opname;
}
- else if (TREE_CODE (type) == UNION_TYPE)
- {
- tree field;
- value = default_function_array_conversion (value);
-
- for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
- if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (field)),
- TYPE_MAIN_VARIANT (TREE_TYPE (value))))
- break;
+ pedwarn (msgid, opname);
+}
+\f
+/* If VALUE is a compound expr all of whose expressions are constant, then
+ return its value. Otherwise, return error_mark_node.
- if (field)
- {
- tree t;
+ This is for handling COMPOUND_EXPRs as initializer elements
+ which is allowed with a warning when -pedantic is specified. */
- if (pedantic)
- pedwarn ("ISO C forbids casts to union type");
- t = digest_init (type, build (CONSTRUCTOR, type, NULL_TREE,
- build_tree_list (field, value)), 0);
- TREE_CONSTANT (t) = TREE_CONSTANT (value);
- return t;
- }
- error ("cast to union type from type not present in union");
- return error_mark_node;
+static tree
+valid_compound_expr_initializer (tree value, tree endtype)
+{
+ if (TREE_CODE (value) == COMPOUND_EXPR)
+ {
+ if (valid_compound_expr_initializer (TREE_OPERAND (value, 0), endtype)
+ == error_mark_node)
+ return error_mark_node;
+ return valid_compound_expr_initializer (TREE_OPERAND (value, 1),
+ endtype);
}
+ else if (! TREE_CONSTANT (value)
+ && ! initializer_constant_valid_p (value, endtype))
+ return error_mark_node;
else
- {
- tree otype, ovalue;
-
- /* If casting to void, avoid the error that would come
- from default_conversion in the case of a non-lvalue array. */
- if (type == void_type_node)
- return build1 (CONVERT_EXPR, type, value);
+ return value;
+}
+\f
+/* Perform appropriate conversions on the initial value of a variable,
+ store it in the declaration DECL,
+ and print any error messages that are appropriate.
+ If the init is invalid, store an ERROR_MARK. */
- /* Convert functions and arrays to pointers,
- but don't convert any other types. */
- value = default_function_array_conversion (value);
- otype = TREE_TYPE (value);
+void
+store_init_value (tree decl, tree init)
+{
+ tree value, type;
- /* Optionally warn about potentially worrisome casts. */
+ /* If variable's type was invalidly declared, just ignore it. */
- if (warn_cast_qual
- && TREE_CODE (type) == POINTER_TYPE
- && TREE_CODE (otype) == POINTER_TYPE)
- {
- tree in_type = type;
- tree in_otype = otype;
- int added = 0;
- int discarded = 0;
+ type = TREE_TYPE (decl);
+ if (TREE_CODE (type) == ERROR_MARK)
+ return;
- /* Check that the qualifiers on IN_TYPE are a superset of
- the qualifiers of IN_OTYPE. The outermost level of
- POINTER_TYPE nodes is uninteresting and we stop as soon
- as we hit a non-POINTER_TYPE node on either type. */
- do
- {
- in_otype = TREE_TYPE (in_otype);
- in_type = TREE_TYPE (in_type);
+ /* Digest the specified initializer into an expression. */
- /* GNU C allows cv-qualified function types. 'const'
- means the function is very pure, 'volatile' means it
- can't return. We need to warn when such qualifiers
- are added, not when they're taken away. */
- if (TREE_CODE (in_otype) == FUNCTION_TYPE
- && TREE_CODE (in_type) == FUNCTION_TYPE)
- added |= (TYPE_QUALS (in_type) & ~TYPE_QUALS (in_otype));
- else
- discarded |= (TYPE_QUALS (in_otype) & ~TYPE_QUALS (in_type));
- }
- while (TREE_CODE (in_type) == POINTER_TYPE
- && TREE_CODE (in_otype) == POINTER_TYPE);
+ value = digest_init (type, init, TREE_STATIC (decl));
- if (added)
- warning ("cast adds new qualifiers to function type");
+ /* Store the expression if valid; else report error. */
- if (discarded)
- /* There are qualifiers present in IN_OTYPE that are not
- present in IN_TYPE. */
- warning ("cast discards qualifiers from pointer target type");
- }
+ if (warn_traditional && !in_system_header
+ && AGGREGATE_TYPE_P (TREE_TYPE (decl)) && ! TREE_STATIC (decl))
+ warning ("traditional C rejects automatic aggregate initialization");
- /* Warn about possible alignment problems. */
- if (STRICT_ALIGNMENT && warn_cast_align
- && TREE_CODE (type) == POINTER_TYPE
- && TREE_CODE (otype) == POINTER_TYPE
- && TREE_CODE (TREE_TYPE (otype)) != VOID_TYPE
- && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE
- /* Don't warn about opaque types, where the actual alignment
- restriction is unknown. */
- && !((TREE_CODE (TREE_TYPE (otype)) == UNION_TYPE
- || TREE_CODE (TREE_TYPE (otype)) == RECORD_TYPE)
- && TYPE_MODE (TREE_TYPE (otype)) == VOIDmode)
- && TYPE_ALIGN (TREE_TYPE (type)) > TYPE_ALIGN (TREE_TYPE (otype)))
- warning ("cast increases required alignment of target type");
+ DECL_INITIAL (decl) = value;
- if (TREE_CODE (type) == INTEGER_TYPE
- && TREE_CODE (otype) == POINTER_TYPE
- && TYPE_PRECISION (type) != TYPE_PRECISION (otype)
- && !TREE_CONSTANT (value))
- warning ("cast from pointer to integer of different size");
+ /* ANSI wants warnings about out-of-range constant initializers. */
+ STRIP_TYPE_NOPS (value);
+ constant_expression_warning (value);
- if (warn_bad_function_cast
- && TREE_CODE (value) == CALL_EXPR
- && TREE_CODE (type) != TREE_CODE (otype))
- warning ("cast does not match function type");
+ /* Check if we need to set array size from compound literal size. */
+ if (TREE_CODE (type) == ARRAY_TYPE
+ && TYPE_DOMAIN (type) == 0
+ && value != error_mark_node)
+ {
+ tree inside_init = init;
- if (TREE_CODE (type) == POINTER_TYPE
- && TREE_CODE (otype) == INTEGER_TYPE
- && TYPE_PRECISION (type) != TYPE_PRECISION (otype)
- /* Don't warn about converting any constant. */
- && !TREE_CONSTANT (value))
- warning ("cast to pointer from integer of different size");
+ if (TREE_CODE (init) == NON_LVALUE_EXPR)
+ inside_init = TREE_OPERAND (init, 0);
+ inside_init = fold (inside_init);
- if (TREE_CODE (type) == POINTER_TYPE
- && TREE_CODE (otype) == POINTER_TYPE
- && TREE_CODE (expr) == ADDR_EXPR
- && DECL_P (TREE_OPERAND (expr, 0))
- && flag_strict_aliasing && warn_strict_aliasing
- && !VOID_TYPE_P (TREE_TYPE (type)))
+ if (TREE_CODE (inside_init) == COMPOUND_LITERAL_EXPR)
{
- /* Casting the address of a decl to non void pointer. Warn
- if the cast breaks type based aliasing. */
- if (!COMPLETE_TYPE_P (TREE_TYPE (type)))
- warning ("type-punning to incomplete type might break strict-aliasing rules");
- else if (!alias_sets_conflict_p
- (get_alias_set (TREE_TYPE (TREE_OPERAND (expr, 0))),
- get_alias_set (TREE_TYPE (type))))
- warning ("dereferencing type-punned pointer will break strict-aliasing rules");
- }
-
- ovalue = value;
- value = convert (type, value);
+ tree decl = COMPOUND_LITERAL_EXPR_DECL (inside_init);
- /* Ignore any integer overflow caused by the cast. */
- if (TREE_CODE (value) == INTEGER_CST)
- {
- TREE_OVERFLOW (value) = TREE_OVERFLOW (ovalue);
- TREE_CONSTANT_OVERFLOW (value) = TREE_CONSTANT_OVERFLOW (ovalue);
+ if (TYPE_DOMAIN (TREE_TYPE (decl)))
+ {
+ /* For int foo[] = (int [3]){1}; we need to set array size
+ now since later on array initializer will be just the
+ brace enclosed list of the compound literal. */
+ TYPE_DOMAIN (type) = TYPE_DOMAIN (TREE_TYPE (decl));
+ layout_type (type);
+ layout_decl (decl, 0);
+ }
}
}
+}
+\f
+/* Methods for storing and printing names for error messages. */
- /* Pedantically, don't let (void *) (FOO *) 0 be a null pointer constant. */
- if (pedantic && TREE_CODE (value) == INTEGER_CST
- && TREE_CODE (expr) == INTEGER_CST
- && TREE_CODE (TREE_TYPE (expr)) != INTEGER_TYPE)
- value = non_lvalue (value);
+/* Implement a spelling stack that allows components of a name to be pushed
+ and popped. Each element on the stack is this structure. */
- /* If pedantic, don't let a cast be an lvalue. */
- if (value == expr && pedantic)
- value = non_lvalue (value);
+struct spelling
+{
+ int kind;
+ union
+ {
+ int i;
+ const char *s;
+ } u;
+};
- return value;
-}
+#define SPELLING_STRING 1
+#define SPELLING_MEMBER 2
+#define SPELLING_BOUNDS 3
-/* Interpret a cast of expression EXPR to type TYPE. */
-tree
-c_cast_expr (type, expr)
- tree type, expr;
-{
- int saved_wsp = warn_strict_prototypes;
+static struct spelling *spelling; /* Next stack element (unused). */
+static struct spelling *spelling_base; /* Spelling stack base. */
+static int spelling_size; /* Size of the spelling stack. */
- /* This avoids warnings about unprototyped casts on
- integers. E.g. "#define SIG_DFL (void(*)())0". */
- if (TREE_CODE (expr) == INTEGER_CST)
- warn_strict_prototypes = 0;
- type = groktypename (type);
- warn_strict_prototypes = saved_wsp;
+/* Macros to save and restore the spelling stack around push_... functions.
+ Alternative to SAVE_SPELLING_STACK. */
- return build_c_cast (type, expr);
+#define SPELLING_DEPTH() (spelling - spelling_base)
+#define RESTORE_SPELLING_DEPTH(DEPTH) (spelling = spelling_base + (DEPTH))
+
+/* Push an element on the spelling stack with type KIND and assign VALUE
+ to MEMBER. */
+
+#define PUSH_SPELLING(KIND, VALUE, MEMBER) \
+{ \
+ int depth = SPELLING_DEPTH (); \
+ \
+ if (depth >= spelling_size) \
+ { \
+ spelling_size += 10; \
+ if (spelling_base == 0) \
+ spelling_base = xmalloc (spelling_size * sizeof (struct spelling)); \
+ else \
+ spelling_base = xrealloc (spelling_base, \
+ spelling_size * sizeof (struct spelling)); \
+ RESTORE_SPELLING_DEPTH (depth); \
+ } \
+ \
+ spelling->kind = (KIND); \
+ spelling->MEMBER = (VALUE); \
+ spelling++; \
}
-\f
-/* Build an assignment expression of lvalue LHS from value RHS.
- MODIFYCODE is the code for a binary operator that we use
- to combine the old value of LHS with RHS to get the new value.
- Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment. */
+/* Push STRING on the stack. Printed literally. */
-tree
-build_modify_expr (lhs, modifycode, rhs)
- tree lhs, rhs;
- enum tree_code modifycode;
+static void
+push_string (const char *string)
{
- tree result;
- tree newrhs;
- tree lhstype = TREE_TYPE (lhs);
- tree olhstype = lhstype;
+ PUSH_SPELLING (SPELLING_STRING, string, u.s);
+}
- /* Types that aren't fully specified cannot be used in assignments. */
- lhs = require_complete_type (lhs);
+/* Push a member name on the stack. Printed as '.' STRING. */
- /* Avoid duplicate error messages from operands that had errors. */
- if (TREE_CODE (lhs) == ERROR_MARK || TREE_CODE (rhs) == ERROR_MARK)
- return error_mark_node;
+static void
+push_member_name (tree decl)
+{
+ const char *const string
+ = DECL_NAME (decl) ? IDENTIFIER_POINTER (DECL_NAME (decl)) : "<anonymous>";
+ PUSH_SPELLING (SPELLING_MEMBER, string, u.s);
+}
- /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
- /* Do not use STRIP_NOPS here. We do not want an enumerator
- whose value is 0 to count as a null pointer constant. */
- if (TREE_CODE (rhs) == NON_LVALUE_EXPR)
- rhs = TREE_OPERAND (rhs, 0);
+/* Push an array bounds on the stack. Printed as [BOUNDS]. */
- newrhs = rhs;
+static void
+push_array_bounds (int bounds)
+{
+ PUSH_SPELLING (SPELLING_BOUNDS, bounds, u.i);
+}
+
+/* Compute the maximum size in bytes of the printed spelling. */
- /* Handle control structure constructs used as "lvalues". */
+static int
+spelling_length (void)
+{
+ int size = 0;
+ struct spelling *p;
- switch (TREE_CODE (lhs))
+ for (p = spelling_base; p < spelling; p++)
{
- /* Handle (a, b) used as an "lvalue". */
- case COMPOUND_EXPR:
- pedantic_lvalue_warning (COMPOUND_EXPR);
- newrhs = build_modify_expr (TREE_OPERAND (lhs, 1), modifycode, rhs);
- if (TREE_CODE (newrhs) == ERROR_MARK)
- return error_mark_node;
- return build (COMPOUND_EXPR, lhstype,
- TREE_OPERAND (lhs, 0), newrhs);
-
- /* Handle (a ? b : c) used as an "lvalue". */
- case COND_EXPR:
- pedantic_lvalue_warning (COND_EXPR);
- rhs = save_expr (rhs);
- {
- /* Produce (a ? (b = rhs) : (c = rhs))
- except that the RHS goes through a save-expr
- so the code to compute it is only emitted once. */
- tree cond
- = build_conditional_expr (TREE_OPERAND (lhs, 0),
- build_modify_expr (TREE_OPERAND (lhs, 1),
- modifycode, rhs),
- build_modify_expr (TREE_OPERAND (lhs, 2),
- modifycode, rhs));
- if (TREE_CODE (cond) == ERROR_MARK)
- return cond;
- /* Make sure the code to compute the rhs comes out
- before the split. */
- return build (COMPOUND_EXPR, TREE_TYPE (lhs),
- /* But cast it to void to avoid an "unused" error. */
- convert (void_type_node, rhs), cond);
- }
- default:
- break;
+ if (p->kind == SPELLING_BOUNDS)
+ size += 25;
+ else
+ size += strlen (p->u.s) + 1;
}
- /* If a binary op has been requested, combine the old LHS value with the RHS
- producing the value we should actually store into the LHS. */
+ return size;
+}
- if (modifycode != NOP_EXPR)
- {
- lhs = stabilize_reference (lhs);
- newrhs = build_binary_op (modifycode, lhs, rhs, 1);
- }
+/* Print the spelling to BUFFER and return it. */
- /* Handle a cast used as an "lvalue".
- We have already performed any binary operator using the value as cast.
- Now convert the result to the cast type of the lhs,
- and then true type of the lhs and store it there;
- then convert result back to the cast type to be the value
- of the assignment. */
+static char *
+print_spelling (char *buffer)
+{
+ char *d = buffer;
+ struct spelling *p;
- switch (TREE_CODE (lhs))
- {
- case NOP_EXPR:
- case CONVERT_EXPR:
- case FLOAT_EXPR:
- case FIX_TRUNC_EXPR:
- case FIX_FLOOR_EXPR:
- case FIX_ROUND_EXPR:
- case FIX_CEIL_EXPR:
- newrhs = default_function_array_conversion (newrhs);
+ for (p = spelling_base; p < spelling; p++)
+ if (p->kind == SPELLING_BOUNDS)
{
- tree inner_lhs = TREE_OPERAND (lhs, 0);
- tree result;
- result = build_modify_expr (inner_lhs, NOP_EXPR,
- convert (TREE_TYPE (inner_lhs),
- convert (lhstype, newrhs)));
- if (TREE_CODE (result) == ERROR_MARK)
- return result;
- pedantic_lvalue_warning (CONVERT_EXPR);
- return convert (TREE_TYPE (lhs), result);
+ sprintf (d, "[%d]", p->u.i);
+ d += strlen (d);
}
-
- default:
- break;
- }
-
- /* Now we have handled acceptable kinds of LHS that are not truly lvalues.
- Reject anything strange now. */
-
- if (!lvalue_or_else (lhs, "invalid lvalue in assignment"))
- return error_mark_node;
-
- /* Warn about storing in something that is `const'. */
-
- if (TREE_READONLY (lhs) || TYPE_READONLY (lhstype)
- || ((TREE_CODE (lhstype) == RECORD_TYPE
- || TREE_CODE (lhstype) == UNION_TYPE)
- && C_TYPE_FIELDS_READONLY (lhstype)))
- readonly_warning (lhs, "assignment");
-
- /* If storing into a structure or union member,
- it has probably been given type `int'.
- Compute the type that would go with
- the actual amount of storage the member occupies. */
+ else
+ {
+ const char *s;
+ if (p->kind == SPELLING_MEMBER)
+ *d++ = '.';
+ for (s = p->u.s; (*d = *s++); d++)
+ ;
+ }
+ *d++ = '\0';
+ return buffer;
+}
- if (TREE_CODE (lhs) == COMPONENT_REF
- && (TREE_CODE (lhstype) == INTEGER_TYPE
- || TREE_CODE (lhstype) == BOOLEAN_TYPE
- || TREE_CODE (lhstype) == REAL_TYPE
- || TREE_CODE (lhstype) == ENUMERAL_TYPE))
- lhstype = TREE_TYPE (get_unwidened (lhs, 0));
+/* Issue an error message for a bad initializer component.
+ MSGID identifies the message.
+ The component name is taken from the spelling stack. */
- /* If storing in a field that is in actuality a short or narrower than one,
- we must store in the field in its actual type. */
+void
+error_init (const char *msgid)
+{
+ char *ofwhat;
- if (lhstype != TREE_TYPE (lhs))
- {
- lhs = copy_node (lhs);
- TREE_TYPE (lhs) = lhstype;
- }
+ error ("%s", _(msgid));
+ ofwhat = print_spelling (alloca (spelling_length () + 1));
+ if (*ofwhat)
+ error ("(near initialization for `%s')", ofwhat);
+}
- /* Convert new value to destination type. */
+/* Issue a pedantic warning for a bad initializer component.
+ MSGID identifies the message.
+ The component name is taken from the spelling stack. */
- newrhs = convert_for_assignment (lhstype, newrhs, _("assignment"),
- NULL_TREE, NULL_TREE, 0);
- if (TREE_CODE (newrhs) == ERROR_MARK)
- return error_mark_node;
+void
+pedwarn_init (const char *msgid)
+{
+ char *ofwhat;
- /* Scan operands */
+ pedwarn ("%s", _(msgid));
+ ofwhat = print_spelling (alloca (spelling_length () + 1));
+ if (*ofwhat)
+ pedwarn ("(near initialization for `%s')", ofwhat);
+}
- result = build (MODIFY_EXPR, lhstype, lhs, newrhs);
- TREE_SIDE_EFFECTS (result) = 1;
+/* Issue a warning for a bad initializer component.
+ MSGID identifies the message.
+ The component name is taken from the spelling stack. */
- /* If we got the LHS in a different type for storing in,
- convert the result back to the nominal type of LHS
- so that the value we return always has the same type
- as the LHS argument. */
+static void
+warning_init (const char *msgid)
+{
+ char *ofwhat;
- if (olhstype == TREE_TYPE (result))
- return result;
- return convert_for_assignment (olhstype, result, _("assignment"),
- NULL_TREE, NULL_TREE, 0);
+ warning ("%s", _(msgid));
+ ofwhat = print_spelling (alloca (spelling_length () + 1));
+ if (*ofwhat)
+ warning ("(near initialization for `%s')", ofwhat);
}
\f
-/* Convert value RHS to type TYPE as preparation for an assignment
- to an lvalue of type TYPE.
- The real work of conversion is done by `convert'.
- The purpose of this function is to generate error messages
- for assignments that are not allowed in C.
- ERRTYPE is a string to use in error messages:
- "assignment", "return", etc. If it is null, this is parameter passing
- for a function call (and different error messages are output).
+/* Digest the parser output INIT as an initializer for type TYPE.
+ Return a C expression of type TYPE to represent the initial value.
- FUNNAME is the name of the function being called,
- as an IDENTIFIER_NODE, or null.
- PARMNUM is the number of the argument, for printing in error messages. */
+ REQUIRE_CONSTANT requests an error if non-constant initializers or
+ elements are seen. */
static tree
-convert_for_assignment (type, rhs, errtype, fundecl, funname, parmnum)
- tree type, rhs;
- const char *errtype;
- tree fundecl, funname;
- int parmnum;
+digest_init (tree type, tree init, int require_constant)
{
- enum tree_code codel = TREE_CODE (type);
- tree rhstype;
- enum tree_code coder;
+ enum tree_code code = TREE_CODE (type);
+ tree inside_init = init;
+
+ if (type == error_mark_node
+ || init == error_mark_node
+ || TREE_TYPE (init) == error_mark_node)
+ return error_mark_node;
/* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
/* Do not use STRIP_NOPS here. We do not want an enumerator
whose value is 0 to count as a null pointer constant. */
- if (TREE_CODE (rhs) == NON_LVALUE_EXPR)
- rhs = TREE_OPERAND (rhs, 0);
+ if (TREE_CODE (init) == NON_LVALUE_EXPR)
+ inside_init = TREE_OPERAND (init, 0);
- if (TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE
- || TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE)
- rhs = default_conversion (rhs);
- else if (optimize && TREE_CODE (rhs) == VAR_DECL)
- rhs = decl_constant_value_for_broken_optimization (rhs);
+ inside_init = fold (inside_init);
- rhstype = TREE_TYPE (rhs);
- coder = TREE_CODE (rhstype);
+ /* Initialization of an array of chars from a string constant
+ optionally enclosed in braces. */
- if (coder == ERROR_MARK)
- return error_mark_node;
-
- if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype))
- {
- overflow_warning (rhs);
- /* Check for Objective-C protocols. This will automatically
- issue a warning if there are protocol violations. No need to
- use the return value. */
- if (flag_objc)
- objc_comptypes (type, rhstype, 0);
- return rhs;
- }
-
- if (coder == VOID_TYPE)
- {
- error ("void value not ignored as it ought to be");
- return error_mark_node;
- }
- /* A type converts to a reference to it.
- This code doesn't fully support references, it's just for the
- special case of va_start and va_copy. */
- if (codel == REFERENCE_TYPE
- && comptypes (TREE_TYPE (type), TREE_TYPE (rhs)) == 1)
+ if (code == ARRAY_TYPE)
{
- if (!lvalue_p (rhs))
+ tree typ1 = TYPE_MAIN_VARIANT (TREE_TYPE (type));
+ if ((typ1 == char_type_node
+ || typ1 == signed_char_type_node
+ || typ1 == unsigned_char_type_node
+ || typ1 == unsigned_wchar_type_node
+ || typ1 == signed_wchar_type_node)
+ && ((inside_init && TREE_CODE (inside_init) == STRING_CST)))
{
- error ("cannot pass rvalue to reference parameter");
- return error_mark_node;
- }
- if (!c_mark_addressable (rhs))
- return error_mark_node;
- rhs = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (rhs)), rhs);
+ if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)),
+ TYPE_MAIN_VARIANT (type)))
+ return inside_init;
- /* We already know that these two types are compatible, but they
- may not be exactly identical. In fact, `TREE_TYPE (type)' is
- likely to be __builtin_va_list and `TREE_TYPE (rhs)' is
- likely to be va_list, a typedef to __builtin_va_list, which
- is different enough that it will cause problems later. */
- if (TREE_TYPE (TREE_TYPE (rhs)) != TREE_TYPE (type))
- rhs = build1 (NOP_EXPR, build_pointer_type (TREE_TYPE (type)), rhs);
+ if ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (inside_init)))
+ != char_type_node)
+ && TYPE_PRECISION (typ1) == TYPE_PRECISION (char_type_node))
+ {
+ error_init ("char-array initialized from wide string");
+ return error_mark_node;
+ }
+ if ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (inside_init)))
+ == char_type_node)
+ && TYPE_PRECISION (typ1) != TYPE_PRECISION (char_type_node))
+ {
+ error_init ("int-array initialized from non-wide string");
+ return error_mark_node;
+ }
- rhs = build1 (NOP_EXPR, type, rhs);
- return rhs;
- }
- /* Arithmetic types all interconvert, and enum is treated like int. */
- else if ((codel == INTEGER_TYPE || codel == REAL_TYPE
- || codel == ENUMERAL_TYPE || codel == COMPLEX_TYPE
- || codel == BOOLEAN_TYPE)
- && (coder == INTEGER_TYPE || coder == REAL_TYPE
- || coder == ENUMERAL_TYPE || coder == COMPLEX_TYPE
- || coder == BOOLEAN_TYPE))
- return convert_and_check (type, rhs);
+ TREE_TYPE (inside_init) = type;
+ if (TYPE_DOMAIN (type) != 0
+ && TYPE_SIZE (type) != 0
+ && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST
+ /* Subtract 1 (or sizeof (wchar_t))
+ because it's ok to ignore the terminating null char
+ that is counted in the length of the constant. */
+ && 0 > compare_tree_int (TYPE_SIZE_UNIT (type),
+ TREE_STRING_LENGTH (inside_init)
+ - ((TYPE_PRECISION (typ1)
+ != TYPE_PRECISION (char_type_node))
+ ? (TYPE_PRECISION (wchar_type_node)
+ / BITS_PER_UNIT)
+ : 1)))
+ pedwarn_init ("initializer-string for array of chars is too long");
- /* Conversion to a transparent union from its member types.
- This applies only to function arguments. */
- else if (codel == UNION_TYPE && TYPE_TRANSPARENT_UNION (type) && ! errtype)
- {
- tree memb_types;
- tree marginal_memb_type = 0;
+ return inside_init;
+ }
+ }
- for (memb_types = TYPE_FIELDS (type); memb_types;
- memb_types = TREE_CHAIN (memb_types))
- {
- tree memb_type = TREE_TYPE (memb_types);
+ /* Build a VECTOR_CST from a *constant* vector constructor. If the
+ vector constructor is not constant (e.g. {1,2,3,foo()}) then punt
+ below and handle as a constructor. */
+ if (code == VECTOR_TYPE
+ && vector_types_convertible_p (TREE_TYPE (inside_init), type)
+ && TREE_CONSTANT (inside_init))
+ {
+ if (TREE_CODE (inside_init) == VECTOR_CST
+ && comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)),
+ TYPE_MAIN_VARIANT (type)))
+ return inside_init;
+ else
+ return build_vector (type, CONSTRUCTOR_ELTS (inside_init));
+ }
- if (comptypes (TYPE_MAIN_VARIANT (memb_type),
- TYPE_MAIN_VARIANT (rhstype)))
- break;
+ /* Any type can be initialized
+ from an expression of the same type, optionally with braces. */
- if (TREE_CODE (memb_type) != POINTER_TYPE)
- continue;
+ if (inside_init && TREE_TYPE (inside_init) != 0
+ && (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)),
+ TYPE_MAIN_VARIANT (type))
+ || (code == ARRAY_TYPE
+ && comptypes (TREE_TYPE (inside_init), type))
+ || (code == VECTOR_TYPE
+ && comptypes (TREE_TYPE (inside_init), type))
+ || (code == POINTER_TYPE
+ && TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE
+ && comptypes (TREE_TYPE (TREE_TYPE (inside_init)),
+ TREE_TYPE (type)))
+ || (code == POINTER_TYPE
+ && TREE_CODE (TREE_TYPE (inside_init)) == FUNCTION_TYPE
+ && comptypes (TREE_TYPE (inside_init),
+ TREE_TYPE (type)))))
+ {
+ if (code == POINTER_TYPE)
+ {
+ inside_init = default_function_array_conversion (inside_init);
- if (coder == POINTER_TYPE)
+ if (TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE)
{
- tree ttl = TREE_TYPE (memb_type);
- tree ttr = TREE_TYPE (rhstype);
-
- /* Any non-function converts to a [const][volatile] void *
- and vice versa; otherwise, targets must be the same.
- Meanwhile, the lhs target must have all the qualifiers of
- the rhs. */
- if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr)
- || comp_target_types (memb_type, rhstype, 0))
- {
- /* If this type won't generate any warnings, use it. */
- if (TYPE_QUALS (ttl) == TYPE_QUALS (ttr)
- || ((TREE_CODE (ttr) == FUNCTION_TYPE
- && TREE_CODE (ttl) == FUNCTION_TYPE)
- ? ((TYPE_QUALS (ttl) | TYPE_QUALS (ttr))
- == TYPE_QUALS (ttr))
- : ((TYPE_QUALS (ttl) | TYPE_QUALS (ttr))
- == TYPE_QUALS (ttl))))
- break;
-
- /* Keep looking for a better type, but remember this one. */
- if (! marginal_memb_type)
- marginal_memb_type = memb_type;
- }
+ error_init ("invalid use of non-lvalue array");
+ return error_mark_node;
}
+ }
- /* Can convert integer zero to any pointer type. */
- if (integer_zerop (rhs)
- || (TREE_CODE (rhs) == NOP_EXPR
- && integer_zerop (TREE_OPERAND (rhs, 0))))
- {
- rhs = null_pointer_node;
- break;
- }
+ if (code == VECTOR_TYPE)
+ /* Although the types are compatible, we may require a
+ conversion. */
+ inside_init = convert (type, inside_init);
+
+ if (require_constant && !flag_isoc99
+ && TREE_CODE (inside_init) == COMPOUND_LITERAL_EXPR)
+ {
+ /* As an extension, allow initializing objects with static storage
+ duration with compound literals (which are then treated just as
+ the brace enclosed list they contain). */
+ tree decl = COMPOUND_LITERAL_EXPR_DECL (inside_init);
+ inside_init = DECL_INITIAL (decl);
}
- if (memb_types || marginal_memb_type)
+ if (code == ARRAY_TYPE && TREE_CODE (inside_init) != STRING_CST
+ && TREE_CODE (inside_init) != CONSTRUCTOR)
{
- if (! memb_types)
- {
- /* We have only a marginally acceptable member type;
- it needs a warning. */
- tree ttl = TREE_TYPE (marginal_memb_type);
- tree ttr = TREE_TYPE (rhstype);
+ error_init ("array initialized from non-constant array expression");
+ return error_mark_node;
+ }
- /* Const and volatile mean something different for function
- types, so the usual warnings are not appropriate. */
- if (TREE_CODE (ttr) == FUNCTION_TYPE
- && TREE_CODE (ttl) == FUNCTION_TYPE)
- {
- /* Because const and volatile on functions are
- restrictions that say the function will not do
- certain things, it is okay to use a const or volatile
- function where an ordinary one is wanted, but not
- vice-versa. */
- if (TYPE_QUALS (ttl) & ~TYPE_QUALS (ttr))
- warn_for_assignment ("%s makes qualified function pointer from unqualified",
- errtype, funname, parmnum);
- }
- else if (TYPE_QUALS (ttr) & ~TYPE_QUALS (ttl))
- warn_for_assignment ("%s discards qualifiers from pointer target type",
- errtype, funname,
- parmnum);
- }
-
- if (pedantic && ! DECL_IN_SYSTEM_HEADER (fundecl))
- pedwarn ("ISO C prohibits argument conversion to union type");
+ if (optimize && TREE_CODE (inside_init) == VAR_DECL)
+ inside_init = decl_constant_value_for_broken_optimization (inside_init);
- return build1 (NOP_EXPR, type, rhs);
+ /* Compound expressions can only occur here if -pedantic or
+ -pedantic-errors is specified. In the later case, we always want
+ an error. In the former case, we simply want a warning. */
+ if (require_constant && pedantic
+ && TREE_CODE (inside_init) == COMPOUND_EXPR)
+ {
+ inside_init
+ = valid_compound_expr_initializer (inside_init,
+ TREE_TYPE (inside_init));
+ if (inside_init == error_mark_node)
+ error_init ("initializer element is not constant");
+ else
+ pedwarn_init ("initializer element is not constant");
+ if (flag_pedantic_errors)
+ inside_init = error_mark_node;
+ }
+ else if (require_constant
+ && (!TREE_CONSTANT (inside_init)
+ /* This test catches things like `7 / 0' which
+ result in an expression for which TREE_CONSTANT
+ is true, but which is not actually something
+ that is a legal constant. We really should not
+ be using this function, because it is a part of
+ the back-end. Instead, the expression should
+ already have been turned into ERROR_MARK_NODE. */
+ || !initializer_constant_valid_p (inside_init,
+ TREE_TYPE (inside_init))))
+ {
+ error_init ("initializer element is not constant");
+ inside_init = error_mark_node;
}
+
+ return inside_init;
}
- /* Conversions among pointers */
- else if ((codel == POINTER_TYPE || codel == REFERENCE_TYPE)
- && (coder == codel))
+ /* Handle scalar types, including conversions. */
+
+ if (code == INTEGER_TYPE || code == REAL_TYPE || code == POINTER_TYPE
+ || code == ENUMERAL_TYPE || code == BOOLEAN_TYPE || code == COMPLEX_TYPE
+ || code == VECTOR_TYPE)
{
- tree ttl = TREE_TYPE (type);
- tree ttr = TREE_TYPE (rhstype);
+ /* Note that convert_for_assignment calls default_conversion
+ for arrays and functions. We must not call it in the
+ case where inside_init is a null pointer constant. */
+ inside_init
+ = convert_for_assignment (type, init, _("initialization"),
+ NULL_TREE, NULL_TREE, 0);
- /* Any non-function converts to a [const][volatile] void *
- and vice versa; otherwise, targets must be the same.
- Meanwhile, the lhs target must have all the qualifiers of the rhs. */
- if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr)
- || comp_target_types (type, rhstype, 0)
- || (c_common_unsigned_type (TYPE_MAIN_VARIANT (ttl))
- == c_common_unsigned_type (TYPE_MAIN_VARIANT (ttr))))
+ if (require_constant && ! TREE_CONSTANT (inside_init))
{
- if (pedantic
- && ((VOID_TYPE_P (ttl) && TREE_CODE (ttr) == FUNCTION_TYPE)
- ||
- (VOID_TYPE_P (ttr)
- /* Check TREE_CODE to catch cases like (void *) (char *) 0
- which are not ANSI null ptr constants. */
- && (!integer_zerop (rhs) || TREE_CODE (rhs) == NOP_EXPR)
- && TREE_CODE (ttl) == FUNCTION_TYPE)))
- warn_for_assignment ("ISO C forbids %s between function pointer and `void *'",
- errtype, funname, parmnum);
- /* Const and volatile mean something different for function types,
- so the usual warnings are not appropriate. */
- else if (TREE_CODE (ttr) != FUNCTION_TYPE
- && TREE_CODE (ttl) != FUNCTION_TYPE)
- {
- if (TYPE_QUALS (ttr) & ~TYPE_QUALS (ttl))
- warn_for_assignment ("%s discards qualifiers from pointer target type",
- errtype, funname, parmnum);
- /* If this is not a case of ignoring a mismatch in signedness,
- no warning. */
- else if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr)
- || comp_target_types (type, rhstype, 0))
- ;
- /* If there is a mismatch, do warn. */
- else if (pedantic)
- warn_for_assignment ("pointer targets in %s differ in signedness",
- errtype, funname, parmnum);
- }
- else if (TREE_CODE (ttl) == FUNCTION_TYPE
- && TREE_CODE (ttr) == FUNCTION_TYPE)
- {
- /* Because const and volatile on functions are restrictions
- that say the function will not do certain things,
- it is okay to use a const or volatile function
- where an ordinary one is wanted, but not vice-versa. */
- if (TYPE_QUALS (ttl) & ~TYPE_QUALS (ttr))
- warn_for_assignment ("%s makes qualified function pointer from unqualified",
- errtype, funname, parmnum);
- }
+ error_init ("initializer element is not constant");
+ inside_init = error_mark_node;
}
- else
- warn_for_assignment ("%s from incompatible pointer type",
- errtype, funname, parmnum);
- return convert (type, rhs);
- }
- else if (codel == POINTER_TYPE && coder == INTEGER_TYPE)
- {
- /* An explicit constant 0 can convert to a pointer,
- or one that results from arithmetic, even including
- a cast to integer type. */
- if (! (TREE_CODE (rhs) == INTEGER_CST && integer_zerop (rhs))
- &&
- ! (TREE_CODE (rhs) == NOP_EXPR
- && TREE_CODE (TREE_TYPE (rhs)) == INTEGER_TYPE
- && TREE_CODE (TREE_OPERAND (rhs, 0)) == INTEGER_CST
- && integer_zerop (TREE_OPERAND (rhs, 0))))
+ else if (require_constant
+ && initializer_constant_valid_p (inside_init, TREE_TYPE (inside_init)) == 0)
{
- warn_for_assignment ("%s makes pointer from integer without a cast",
- errtype, funname, parmnum);
- return convert (type, rhs);
+ error_init ("initializer element is not computable at load time");
+ inside_init = error_mark_node;
}
- return null_pointer_node;
- }
- else if (codel == INTEGER_TYPE && coder == POINTER_TYPE)
- {
- warn_for_assignment ("%s makes integer from pointer without a cast",
- errtype, funname, parmnum);
- return convert (type, rhs);
+
+ return inside_init;
}
- else if (codel == BOOLEAN_TYPE && coder == POINTER_TYPE)
- return convert (type, rhs);
- if (!errtype)
+ /* Come here only for records and arrays. */
+
+ if (COMPLETE_TYPE_P (type) && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
{
- if (funname)
- {
- tree selector = objc_message_selector ();
-
- if (selector && parmnum > 2)
- error ("incompatible type for argument %d of `%s'",
- parmnum - 2, IDENTIFIER_POINTER (selector));
- else
- error ("incompatible type for argument %d of `%s'",
- parmnum, IDENTIFIER_POINTER (funname));
- }
- else
- error ("incompatible type for argument %d of indirect function call",
- parmnum);
+ error_init ("variable-sized object may not be initialized");
+ return error_mark_node;
}
- else
- error ("incompatible types in %s", errtype);
+ error_init ("invalid initializer");
return error_mark_node;
}
+\f
+/* Handle initializers that use braces. */
-/* Convert VALUE for assignment into inlined parameter PARM. */
+/* Type of object we are accumulating a constructor for.
+ This type is always a RECORD_TYPE, UNION_TYPE or ARRAY_TYPE. */
+static tree constructor_type;
-tree
-c_convert_parm_for_inlining (parm, value, fn)
- tree parm, value, fn;
-{
- tree ret, type;
+/* For a RECORD_TYPE or UNION_TYPE, this is the chain of fields
+ left to fill. */
+static tree constructor_fields;
- /* If FN was prototyped, the value has been converted already
- in convert_arguments. */
- if (! value || TYPE_ARG_TYPES (TREE_TYPE (fn)))
- return value;
+/* For an ARRAY_TYPE, this is the specified index
+ at which to store the next element we get. */
+static tree constructor_index;
- type = TREE_TYPE (parm);
- ret = convert_for_assignment (type, value,
- (char *) 0 /* arg passing */, fn,
- DECL_NAME (fn), 0);
- if (PROMOTE_PROTOTYPES
- && INTEGRAL_TYPE_P (type)
- && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)))
- ret = default_conversion (ret);
- return ret;
-}
+/* For an ARRAY_TYPE, this is the maximum index. */
+static tree constructor_max_index;
-/* Print a warning using MSGID.
- It gets OPNAME as its one parameter.
- if OPNAME is null and ARGNUM is 0, it is replaced by "passing arg of `FUNCTION'".
- Otherwise if OPNAME is null, it is replaced by "passing arg ARGNUM of `FUNCTION'".
- FUNCTION and ARGNUM are handled specially if we are building an
- Objective-C selector. */
+/* For a RECORD_TYPE, this is the first field not yet written out. */
+static tree constructor_unfilled_fields;
-static void
-warn_for_assignment (msgid, opname, function, argnum)
- const char *msgid;
- const char *opname;
- tree function;
- int argnum;
-{
- if (opname == 0)
- {
- tree selector = objc_message_selector ();
- char * new_opname;
-
- if (selector && argnum > 2)
- {
- function = selector;
- argnum -= 2;
- }
- if (argnum == 0)
- {
- if (function)
- {
- /* Function name is known; supply it. */
- const char *const argstring = _("passing arg of `%s'");
- new_opname = (char *) alloca (IDENTIFIER_LENGTH (function)
- + strlen (argstring) + 1
- + 1);
- sprintf (new_opname, argstring,
- IDENTIFIER_POINTER (function));
- }
- else
- {
- /* Function name unknown (call through ptr). */
- const char *const argnofun = _("passing arg of pointer to function");
- new_opname = (char *) alloca (strlen (argnofun) + 1 + 1);
- sprintf (new_opname, argnofun);
- }
- }
- else if (function)
- {
- /* Function name is known; supply it. */
- const char *const argstring = _("passing arg %d of `%s'");
- new_opname = (char *) alloca (IDENTIFIER_LENGTH (function)
- + strlen (argstring) + 1 + 25
- /*%d*/ + 1);
- sprintf (new_opname, argstring, argnum,
- IDENTIFIER_POINTER (function));
- }
- else
- {
- /* Function name unknown (call through ptr); just give arg number. */
- const char *const argnofun = _("passing arg %d of pointer to function");
- new_opname = (char *) alloca (strlen (argnofun) + 1 + 25 /*%d*/ + 1);
- sprintf (new_opname, argnofun, argnum);
- }
- opname = new_opname;
- }
- pedwarn (msgid, opname);
-}
-\f
-/* If VALUE is a compound expr all of whose expressions are constant, then
- return its value. Otherwise, return error_mark_node.
+/* For an ARRAY_TYPE, this is the index of the first element
+ not yet written out. */
+static tree constructor_unfilled_index;
- This is for handling COMPOUND_EXPRs as initializer elements
- which is allowed with a warning when -pedantic is specified. */
+/* In a RECORD_TYPE, the byte index of the next consecutive field.
+ This is so we can generate gaps between fields, when appropriate. */
+static tree constructor_bit_index;
-static tree
-valid_compound_expr_initializer (value, endtype)
- tree value;
- tree endtype;
-{
- if (TREE_CODE (value) == COMPOUND_EXPR)
- {
- if (valid_compound_expr_initializer (TREE_OPERAND (value, 0), endtype)
- == error_mark_node)
- return error_mark_node;
- return valid_compound_expr_initializer (TREE_OPERAND (value, 1),
- endtype);
- }
- else if (! TREE_CONSTANT (value)
- && ! initializer_constant_valid_p (value, endtype))
- return error_mark_node;
- else
- return value;
-}
-\f
-/* Perform appropriate conversions on the initial value of a variable,
- store it in the declaration DECL,
- and print any error messages that are appropriate.
- If the init is invalid, store an ERROR_MARK. */
+/* If we are saving up the elements rather than allocating them,
+ this is the list of elements so far (in reverse order,
+ most recent first). */
+static tree constructor_elements;
-void
-store_init_value (decl, init)
- tree decl, init;
-{
- tree value, type;
+/* 1 if constructor should be incrementally stored into a constructor chain,
+ 0 if all the elements should be kept in AVL tree. */
+static int constructor_incremental;
- /* If variable's type was invalidly declared, just ignore it. */
+/* 1 if so far this constructor's elements are all compile-time constants. */
+static int constructor_constant;
- type = TREE_TYPE (decl);
- if (TREE_CODE (type) == ERROR_MARK)
- return;
+/* 1 if so far this constructor's elements are all valid address constants. */
+static int constructor_simple;
- /* Digest the specified initializer into an expression. */
+/* 1 if this constructor is erroneous so far. */
+static int constructor_erroneous;
- value = digest_init (type, init, TREE_STATIC (decl));
+/* Structure for managing pending initializer elements, organized as an
+ AVL tree. */
- /* Store the expression if valid; else report error. */
+struct init_node
+{
+ struct init_node *left, *right;
+ struct init_node *parent;
+ int balance;
+ tree purpose;
+ tree value;
+};
-#if 0
- /* Note that this is the only place we can detect the error
- in a case such as struct foo bar = (struct foo) { x, y };
- where there is one initial value which is a constructor expression. */
- if (value == error_mark_node)
- ;
- else if (TREE_STATIC (decl) && ! TREE_CONSTANT (value))
- {
- error ("initializer for static variable is not constant");
- value = error_mark_node;
- }
- else if (TREE_STATIC (decl)
- && initializer_constant_valid_p (value, TREE_TYPE (value)) == 0)
- {
- error ("initializer for static variable uses complicated arithmetic");
- value = error_mark_node;
- }
- else
- {
- if (pedantic && TREE_CODE (value) == CONSTRUCTOR)
- {
- if (! TREE_CONSTANT (value))
- pedwarn ("aggregate initializer is not constant");
- else if (! TREE_STATIC (value))
- pedwarn ("aggregate initializer uses complicated arithmetic");
- }
- }
-#endif
+/* Tree of pending elements at this constructor level.
+ These are elements encountered out of order
+ which belong at places we haven't reached yet in actually
+ writing the output.
+ Will never hold tree nodes across GC runs. */
+static struct init_node *constructor_pending_elts;
- if (warn_traditional && !in_system_header
- && AGGREGATE_TYPE_P (TREE_TYPE (decl)) && ! TREE_STATIC (decl))
- warning ("traditional C rejects automatic aggregate initialization");
+/* The SPELLING_DEPTH of this constructor. */
+static int constructor_depth;
- DECL_INITIAL (decl) = value;
+/* 0 if implicitly pushing constructor levels is allowed. */
+int constructor_no_implicit = 0; /* 0 for C; 1 for some other languages. */
- /* ANSI wants warnings about out-of-range constant initializers. */
- STRIP_TYPE_NOPS (value);
- constant_expression_warning (value);
+/* DECL node for which an initializer is being read.
+ 0 means we are reading a constructor expression
+ such as (struct foo) {...}. */
+static tree constructor_decl;
- /* Check if we need to set array size from compound literal size. */
- if (TREE_CODE (type) == ARRAY_TYPE
- && TYPE_DOMAIN (type) == 0
- && value != error_mark_node)
- {
- tree inside_init = init;
+/* start_init saves the ASMSPEC arg here for really_start_incremental_init. */
+static const char *constructor_asmspec;
- if (TREE_CODE (init) == NON_LVALUE_EXPR)
- inside_init = TREE_OPERAND (init, 0);
- inside_init = fold (inside_init);
+/* Nonzero if this is an initializer for a top-level decl. */
+static int constructor_top_level;
- if (TREE_CODE (inside_init) == COMPOUND_LITERAL_EXPR)
- {
- tree decl = COMPOUND_LITERAL_EXPR_DECL (inside_init);
+/* Nonzero if there were any member designators in this initializer. */
+static int constructor_designated;
+
+/* Nesting depth of designator list. */
+static int designator_depth;
+
+/* Nonzero if there were diagnosed errors in this designator list. */
+static int designator_errorneous;
- if (TYPE_DOMAIN (TREE_TYPE (decl)))
- {
- /* For int foo[] = (int [3]){1}; we need to set array size
- now since later on array initializer will be just the
- brace enclosed list of the compound literal. */
- TYPE_DOMAIN (type) = TYPE_DOMAIN (TREE_TYPE (decl));
- layout_type (type);
- layout_decl (decl, 0);
- }
- }
- }
-}
\f
-/* Methods for storing and printing names for error messages. */
+/* This stack has a level for each implicit or explicit level of
+ structuring in the initializer, including the outermost one. It
+ saves the values of most of the variables above. */
-/* Implement a spelling stack that allows components of a name to be pushed
- and popped. Each element on the stack is this structure. */
+struct constructor_range_stack;
-struct spelling
+struct constructor_stack
{
- int kind;
- union
- {
- int i;
- const char *s;
- } u;
+ struct constructor_stack *next;
+ tree type;
+ tree fields;
+ tree index;
+ tree max_index;
+ tree unfilled_index;
+ tree unfilled_fields;
+ tree bit_index;
+ tree elements;
+ struct init_node *pending_elts;
+ int offset;
+ int depth;
+ /* If nonzero, this value should replace the entire
+ constructor at this level. */
+ tree replacement_value;
+ struct constructor_range_stack *range_stack;
+ char constant;
+ char simple;
+ char implicit;
+ char erroneous;
+ char outer;
+ char incremental;
+ char designated;
};
-#define SPELLING_STRING 1
-#define SPELLING_MEMBER 2
-#define SPELLING_BOUNDS 3
-
-static struct spelling *spelling; /* Next stack element (unused). */
-static struct spelling *spelling_base; /* Spelling stack base. */
-static int spelling_size; /* Size of the spelling stack. */
-
-/* Macros to save and restore the spelling stack around push_... functions.
- Alternative to SAVE_SPELLING_STACK. */
+struct constructor_stack *constructor_stack;
-#define SPELLING_DEPTH() (spelling - spelling_base)
-#define RESTORE_SPELLING_DEPTH(DEPTH) (spelling = spelling_base + (DEPTH))
+/* This stack represents designators from some range designator up to
+ the last designator in the list. */
-/* Push an element on the spelling stack with type KIND and assign VALUE
- to MEMBER. */
+struct constructor_range_stack
+{
+ struct constructor_range_stack *next, *prev;
+ struct constructor_stack *stack;
+ tree range_start;
+ tree index;
+ tree range_end;
+ tree fields;
+};
-#define PUSH_SPELLING(KIND, VALUE, MEMBER) \
-{ \
- int depth = SPELLING_DEPTH (); \
- \
- if (depth >= spelling_size) \
- { \
- spelling_size += 10; \
- if (spelling_base == 0) \
- spelling_base \
- = (struct spelling *) xmalloc (spelling_size * sizeof (struct spelling)); \
- else \
- spelling_base \
- = (struct spelling *) xrealloc (spelling_base, \
- spelling_size * sizeof (struct spelling)); \
- RESTORE_SPELLING_DEPTH (depth); \
- } \
- \
- spelling->kind = (KIND); \
- spelling->MEMBER = (VALUE); \
- spelling++; \
-}
+struct constructor_range_stack *constructor_range_stack;
-/* Push STRING on the stack. Printed literally. */
+/* This stack records separate initializers that are nested.
+ Nested initializers can't happen in ANSI C, but GNU C allows them
+ in cases like { ... (struct foo) { ... } ... }. */
-static void
-push_string (string)
- const char *string;
+struct initializer_stack
{
- PUSH_SPELLING (SPELLING_STRING, string, u.s);
-}
+ struct initializer_stack *next;
+ tree decl;
+ const char *asmspec;
+ struct constructor_stack *constructor_stack;
+ struct constructor_range_stack *constructor_range_stack;
+ tree elements;
+ struct spelling *spelling;
+ struct spelling *spelling_base;
+ int spelling_size;
+ char top_level;
+ char require_constant_value;
+ char require_constant_elements;
+};
-/* Push a member name on the stack. Printed as '.' STRING. */
+struct initializer_stack *initializer_stack;
+\f
+/* Prepare to parse and output the initializer for variable DECL. */
-static void
-push_member_name (decl)
- tree decl;
-
+void
+start_init (tree decl, tree asmspec_tree, int top_level)
{
- const char *const string
- = DECL_NAME (decl) ? IDENTIFIER_POINTER (DECL_NAME (decl)) : "<anonymous>";
- PUSH_SPELLING (SPELLING_MEMBER, string, u.s);
-}
-
-/* Push an array bounds on the stack. Printed as [BOUNDS]. */
+ const char *locus;
+ struct initializer_stack *p = xmalloc (sizeof (struct initializer_stack));
+ const char *asmspec = 0;
-static void
-push_array_bounds (bounds)
- int bounds;
-{
- PUSH_SPELLING (SPELLING_BOUNDS, bounds, u.i);
-}
+ if (asmspec_tree)
+ asmspec = TREE_STRING_POINTER (asmspec_tree);
-/* Compute the maximum size in bytes of the printed spelling. */
+ p->decl = constructor_decl;
+ p->asmspec = constructor_asmspec;
+ p->require_constant_value = require_constant_value;
+ p->require_constant_elements = require_constant_elements;
+ p->constructor_stack = constructor_stack;
+ p->constructor_range_stack = constructor_range_stack;
+ p->elements = constructor_elements;
+ p->spelling = spelling;
+ p->spelling_base = spelling_base;
+ p->spelling_size = spelling_size;
+ p->top_level = constructor_top_level;
+ p->next = initializer_stack;
+ initializer_stack = p;
-static int
-spelling_length ()
-{
- int size = 0;
- struct spelling *p;
+ constructor_decl = decl;
+ constructor_asmspec = asmspec;
+ constructor_designated = 0;
+ constructor_top_level = top_level;
- for (p = spelling_base; p < spelling; p++)
+ if (decl != 0)
{
- if (p->kind == SPELLING_BOUNDS)
- size += 25;
- else
- size += strlen (p->u.s) + 1;
+ require_constant_value = TREE_STATIC (decl);
+ require_constant_elements
+ = ((TREE_STATIC (decl) || (pedantic && !flag_isoc99))
+ /* For a scalar, you can always use any value to initialize,
+ even within braces. */
+ && (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
+ || TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
+ || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE
+ || TREE_CODE (TREE_TYPE (decl)) == QUAL_UNION_TYPE));
+ locus = IDENTIFIER_POINTER (DECL_NAME (decl));
+ }
+ else
+ {
+ require_constant_value = 0;
+ require_constant_elements = 0;
+ locus = "(anonymous)";
}
- return size;
-}
+ constructor_stack = 0;
+ constructor_range_stack = 0;
-/* Print the spelling to BUFFER and return it. */
+ missing_braces_mentioned = 0;
-static char *
-print_spelling (buffer)
- char *buffer;
-{
- char *d = buffer;
- struct spelling *p;
+ spelling_base = 0;
+ spelling_size = 0;
+ RESTORE_SPELLING_DEPTH (0);
- for (p = spelling_base; p < spelling; p++)
- if (p->kind == SPELLING_BOUNDS)
- {
- sprintf (d, "[%d]", p->u.i);
- d += strlen (d);
- }
- else
- {
- const char *s;
- if (p->kind == SPELLING_MEMBER)
- *d++ = '.';
- for (s = p->u.s; (*d = *s++); d++)
- ;
- }
- *d++ = '\0';
- return buffer;
+ if (locus)
+ push_string (locus);
}
-/* Issue an error message for a bad initializer component.
- MSGID identifies the message.
- The component name is taken from the spelling stack. */
-
void
-error_init (msgid)
- const char *msgid;
+finish_init (void)
{
- char *ofwhat;
-
- error ("%s", _(msgid));
- ofwhat = print_spelling ((char *) alloca (spelling_length () + 1));
- if (*ofwhat)
- error ("(near initialization for `%s')", ofwhat);
-}
+ struct initializer_stack *p = initializer_stack;
-/* Issue a pedantic warning for a bad initializer component.
- MSGID identifies the message.
- The component name is taken from the spelling stack. */
-
-void
-pedwarn_init (msgid)
- const char *msgid;
-{
- char *ofwhat;
-
- pedwarn ("%s", _(msgid));
- ofwhat = print_spelling ((char *) alloca (spelling_length () + 1));
- if (*ofwhat)
- pedwarn ("(near initialization for `%s')", ofwhat);
-}
+ /* Free the whole constructor stack of this initializer. */
+ while (constructor_stack)
+ {
+ struct constructor_stack *q = constructor_stack;
+ constructor_stack = q->next;
+ free (q);
+ }
-/* Issue a warning for a bad initializer component.
- MSGID identifies the message.
- The component name is taken from the spelling stack. */
+ if (constructor_range_stack)
+ abort ();
-static void
-warning_init (msgid)
- const char *msgid;
-{
- char *ofwhat;
+ /* Pop back to the data of the outer initializer (if any). */
+ free (spelling_base);
- warning ("%s", _(msgid));
- ofwhat = print_spelling ((char *) alloca (spelling_length () + 1));
- if (*ofwhat)
- warning ("(near initialization for `%s')", ofwhat);
+ constructor_decl = p->decl;
+ constructor_asmspec = p->asmspec;
+ require_constant_value = p->require_constant_value;
+ require_constant_elements = p->require_constant_elements;
+ constructor_stack = p->constructor_stack;
+ constructor_range_stack = p->constructor_range_stack;
+ constructor_elements = p->elements;
+ spelling = p->spelling;
+ spelling_base = p->spelling_base;
+ spelling_size = p->spelling_size;
+ constructor_top_level = p->top_level;
+ initializer_stack = p->next;
+ free (p);
}
\f
-/* Digest the parser output INIT as an initializer for type TYPE.
- Return a C expression of type TYPE to represent the initial value.
+/* Call here when we see the initializer is surrounded by braces.
+ This is instead of a call to push_init_level;
+ it is matched by a call to pop_init_level.
- REQUIRE_CONSTANT requests an error if non-constant initializers or
- elements are seen. */
+ TYPE is the type to initialize, for a constructor expression.
+ For an initializer for a decl, TYPE is zero. */
-static tree
-digest_init (type, init, require_constant)
- tree type, init;
- int require_constant;
+void
+really_start_incremental_init (tree type)
{
- enum tree_code code = TREE_CODE (type);
- tree inside_init = init;
+ struct constructor_stack *p = xmalloc (sizeof (struct constructor_stack));
- if (type == error_mark_node
- || init == error_mark_node
- || TREE_TYPE (init) == error_mark_node)
- return error_mark_node;
+ if (type == 0)
+ type = TREE_TYPE (constructor_decl);
- /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
- /* Do not use STRIP_NOPS here. We do not want an enumerator
- whose value is 0 to count as a null pointer constant. */
- if (TREE_CODE (init) == NON_LVALUE_EXPR)
- inside_init = TREE_OPERAND (init, 0);
+ if (targetm.vector_opaque_p (type))
+ error ("opaque vector types cannot be initialized");
- inside_init = fold (inside_init);
+ p->type = constructor_type;
+ p->fields = constructor_fields;
+ p->index = constructor_index;
+ p->max_index = constructor_max_index;
+ p->unfilled_index = constructor_unfilled_index;
+ p->unfilled_fields = constructor_unfilled_fields;
+ p->bit_index = constructor_bit_index;
+ p->elements = constructor_elements;
+ p->constant = constructor_constant;
+ p->simple = constructor_simple;
+ p->erroneous = constructor_erroneous;
+ p->pending_elts = constructor_pending_elts;
+ p->depth = constructor_depth;
+ p->replacement_value = 0;
+ p->implicit = 0;
+ p->range_stack = 0;
+ p->outer = 0;
+ p->incremental = constructor_incremental;
+ p->designated = constructor_designated;
+ p->next = 0;
+ constructor_stack = p;
- /* Initialization of an array of chars from a string constant
- optionally enclosed in braces. */
+ constructor_constant = 1;
+ constructor_simple = 1;
+ constructor_depth = SPELLING_DEPTH ();
+ constructor_elements = 0;
+ constructor_pending_elts = 0;
+ constructor_type = type;
+ constructor_incremental = 1;
+ constructor_designated = 0;
+ designator_depth = 0;
+ designator_errorneous = 0;
- if (code == ARRAY_TYPE)
+ if (TREE_CODE (constructor_type) == RECORD_TYPE
+ || TREE_CODE (constructor_type) == UNION_TYPE)
{
- tree typ1 = TYPE_MAIN_VARIANT (TREE_TYPE (type));
- if ((typ1 == char_type_node
- || typ1 == signed_char_type_node
- || typ1 == unsigned_char_type_node
- || typ1 == unsigned_wchar_type_node
- || typ1 == signed_wchar_type_node)
- && ((inside_init && TREE_CODE (inside_init) == STRING_CST)))
- {
- if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)),
- TYPE_MAIN_VARIANT (type)))
- return inside_init;
-
- if ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (inside_init)))
- != char_type_node)
- && TYPE_PRECISION (typ1) == TYPE_PRECISION (char_type_node))
- {
- error_init ("char-array initialized from wide string");
- return error_mark_node;
- }
- if ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (inside_init)))
- == char_type_node)
- && TYPE_PRECISION (typ1) != TYPE_PRECISION (char_type_node))
- {
- error_init ("int-array initialized from non-wide string");
- return error_mark_node;
- }
-
- TREE_TYPE (inside_init) = type;
- if (TYPE_DOMAIN (type) != 0
- && TYPE_SIZE (type) != 0
- && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST
- /* Subtract 1 (or sizeof (wchar_t))
- because it's ok to ignore the terminating null char
- that is counted in the length of the constant. */
- && 0 > compare_tree_int (TYPE_SIZE_UNIT (type),
- TREE_STRING_LENGTH (inside_init)
- - ((TYPE_PRECISION (typ1)
- != TYPE_PRECISION (char_type_node))
- ? (TYPE_PRECISION (wchar_type_node)
- / BITS_PER_UNIT)
- : 1)))
- pedwarn_init ("initializer-string for array of chars is too long");
+ constructor_fields = TYPE_FIELDS (constructor_type);
+ /* Skip any nameless bit fields at the beginning. */
+ while (constructor_fields != 0 && DECL_C_BIT_FIELD (constructor_fields)
+ && DECL_NAME (constructor_fields) == 0)
+ constructor_fields = TREE_CHAIN (constructor_fields);
- return inside_init;
- }
+ constructor_unfilled_fields = constructor_fields;
+ constructor_bit_index = bitsize_zero_node;
}
-
- /* Any type can be initialized
- from an expression of the same type, optionally with braces. */
-
- if (inside_init && TREE_TYPE (inside_init) != 0
- && (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)),
- TYPE_MAIN_VARIANT (type))
- || (code == ARRAY_TYPE
- && comptypes (TREE_TYPE (inside_init), type))
- || (code == VECTOR_TYPE
- && comptypes (TREE_TYPE (inside_init), type))
- || (code == POINTER_TYPE
- && (TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE
- || TREE_CODE (TREE_TYPE (inside_init)) == FUNCTION_TYPE)
- && comptypes (TREE_TYPE (TREE_TYPE (inside_init)),
- TREE_TYPE (type)))))
+ else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
{
- if (code == POINTER_TYPE)
- inside_init = default_function_array_conversion (inside_init);
-
- if (require_constant && !flag_isoc99
- && TREE_CODE (inside_init) == COMPOUND_LITERAL_EXPR)
+ if (TYPE_DOMAIN (constructor_type))
{
- /* As an extension, allow initializing objects with static storage
- duration with compound literals (which are then treated just as
- the brace enclosed list they contain). */
- tree decl = COMPOUND_LITERAL_EXPR_DECL (inside_init);
- inside_init = DECL_INITIAL (decl);
- }
+ constructor_max_index
+ = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type));
- if (code == ARRAY_TYPE && TREE_CODE (inside_init) != STRING_CST
- && TREE_CODE (inside_init) != CONSTRUCTOR)
- {
- error_init ("array initialized from non-constant array expression");
- return error_mark_node;
- }
+ /* Detect non-empty initializations of zero-length arrays. */
+ if (constructor_max_index == NULL_TREE
+ && TYPE_SIZE (constructor_type))
+ constructor_max_index = build_int_2 (-1, -1);
- if (optimize && TREE_CODE (inside_init) == VAR_DECL)
- inside_init = decl_constant_value_for_broken_optimization (inside_init);
+ /* constructor_max_index needs to be an INTEGER_CST. Attempts
+ to initialize VLAs will cause a proper error; avoid tree
+ checking errors as well by setting a safe value. */
+ if (constructor_max_index
+ && TREE_CODE (constructor_max_index) != INTEGER_CST)
+ constructor_max_index = build_int_2 (-1, -1);
- /* Compound expressions can only occur here if -pedantic or
- -pedantic-errors is specified. In the later case, we always want
- an error. In the former case, we simply want a warning. */
- if (require_constant && pedantic
- && TREE_CODE (inside_init) == COMPOUND_EXPR)
- {
- inside_init
- = valid_compound_expr_initializer (inside_init,
- TREE_TYPE (inside_init));
- if (inside_init == error_mark_node)
- error_init ("initializer element is not constant");
- else
- pedwarn_init ("initializer element is not constant");
- if (flag_pedantic_errors)
- inside_init = error_mark_node;
- }
- else if (require_constant
- && (!TREE_CONSTANT (inside_init)
- /* This test catches things like `7 / 0' which
- result in an expression for which TREE_CONSTANT
- is true, but which is not actually something
- that is a legal constant. We really should not
- be using this function, because it is a part of
- the back-end. Instead, the expression should
- already have been turned into ERROR_MARK_NODE. */
- || !initializer_constant_valid_p (inside_init,
- TREE_TYPE (inside_init))))
- {
- error_init ("initializer element is not constant");
- inside_init = error_mark_node;
+ constructor_index
+ = convert (bitsizetype,
+ TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type)));
}
+ else
+ constructor_index = bitsize_zero_node;
- return inside_init;
+ constructor_unfilled_index = constructor_index;
}
-
- /* Handle scalar types, including conversions. */
-
- if (code == INTEGER_TYPE || code == REAL_TYPE || code == POINTER_TYPE
- || code == ENUMERAL_TYPE || code == BOOLEAN_TYPE || code == COMPLEX_TYPE)
+ else if (TREE_CODE (constructor_type) == VECTOR_TYPE)
{
- /* Note that convert_for_assignment calls default_conversion
- for arrays and functions. We must not call it in the
- case where inside_init is a null pointer constant. */
- inside_init
- = convert_for_assignment (type, init, _("initialization"),
- NULL_TREE, NULL_TREE, 0);
-
- if (require_constant && ! TREE_CONSTANT (inside_init))
- {
- error_init ("initializer element is not constant");
- inside_init = error_mark_node;
- }
- else if (require_constant
- && initializer_constant_valid_p (inside_init, TREE_TYPE (inside_init)) == 0)
- {
- error_init ("initializer element is not computable at load time");
- inside_init = error_mark_node;
- }
-
- return inside_init;
+ /* Vectors are like simple fixed-size arrays. */
+ constructor_max_index =
+ build_int_2 (TYPE_VECTOR_SUBPARTS (constructor_type) - 1, 0);
+ constructor_index = convert (bitsizetype, bitsize_zero_node);
+ constructor_unfilled_index = constructor_index;
}
-
- /* Come here only for records and arrays. */
-
- if (COMPLETE_TYPE_P (type) && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
+ else
{
- error_init ("variable-sized object may not be initialized");
- return error_mark_node;
+ /* Handle the case of int x = {5}; */
+ constructor_fields = constructor_type;
+ constructor_unfilled_fields = constructor_type;
}
-
- error_init ("invalid initializer");
- return error_mark_node;
}
\f
-/* Handle initializers that use braces. */
-
-/* Type of object we are accumulating a constructor for.
- This type is always a RECORD_TYPE, UNION_TYPE or ARRAY_TYPE. */
-static tree constructor_type;
+/* Push down into a subobject, for initialization.
+ If this is for an explicit set of braces, IMPLICIT is 0.
+ If it is because the next element belongs at a lower level,
+ IMPLICIT is 1 (or 2 if the push is because of designator list). */
-/* For a RECORD_TYPE or UNION_TYPE, this is the chain of fields
- left to fill. */
-static tree constructor_fields;
+void
+push_init_level (int implicit)
+{
+ struct constructor_stack *p;
+ tree value = NULL_TREE;
-/* For an ARRAY_TYPE, this is the specified index
- at which to store the next element we get. */
-static tree constructor_index;
+ /* If we've exhausted any levels that didn't have braces,
+ pop them now. */
+ while (constructor_stack->implicit)
+ {
+ if ((TREE_CODE (constructor_type) == RECORD_TYPE
+ || TREE_CODE (constructor_type) == UNION_TYPE)
+ && constructor_fields == 0)
+ process_init_element (pop_init_level (1));
+ else if (TREE_CODE (constructor_type) == ARRAY_TYPE
+ && constructor_max_index
+ && tree_int_cst_lt (constructor_max_index, constructor_index))
+ process_init_element (pop_init_level (1));
+ else
+ break;
+ }
-/* For an ARRAY_TYPE, this is the maximum index. */
-static tree constructor_max_index;
+ /* Unless this is an explicit brace, we need to preserve previous
+ content if any. */
+ if (implicit)
+ {
+ if ((TREE_CODE (constructor_type) == RECORD_TYPE
+ || TREE_CODE (constructor_type) == UNION_TYPE)
+ && constructor_fields)
+ value = find_init_member (constructor_fields);
+ else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
+ value = find_init_member (constructor_index);
+ }
-/* For a RECORD_TYPE, this is the first field not yet written out. */
-static tree constructor_unfilled_fields;
+ p = xmalloc (sizeof (struct constructor_stack));
+ p->type = constructor_type;
+ p->fields = constructor_fields;
+ p->index = constructor_index;
+ p->max_index = constructor_max_index;
+ p->unfilled_index = constructor_unfilled_index;
+ p->unfilled_fields = constructor_unfilled_fields;
+ p->bit_index = constructor_bit_index;
+ p->elements = constructor_elements;
+ p->constant = constructor_constant;
+ p->simple = constructor_simple;
+ p->erroneous = constructor_erroneous;
+ p->pending_elts = constructor_pending_elts;
+ p->depth = constructor_depth;
+ p->replacement_value = 0;
+ p->implicit = implicit;
+ p->outer = 0;
+ p->incremental = constructor_incremental;
+ p->designated = constructor_designated;
+ p->next = constructor_stack;
+ p->range_stack = 0;
+ constructor_stack = p;
-/* For an ARRAY_TYPE, this is the index of the first element
- not yet written out. */
-static tree constructor_unfilled_index;
+ constructor_constant = 1;
+ constructor_simple = 1;
+ constructor_depth = SPELLING_DEPTH ();
+ constructor_elements = 0;
+ constructor_incremental = 1;
+ constructor_designated = 0;
+ constructor_pending_elts = 0;
+ if (!implicit)
+ {
+ p->range_stack = constructor_range_stack;
+ constructor_range_stack = 0;
+ designator_depth = 0;
+ designator_errorneous = 0;
+ }
-/* In a RECORD_TYPE, the byte index of the next consecutive field.
- This is so we can generate gaps between fields, when appropriate. */
-static tree constructor_bit_index;
+ /* Don't die if an entire brace-pair level is superfluous
+ in the containing level. */
+ if (constructor_type == 0)
+ ;
+ else if (TREE_CODE (constructor_type) == RECORD_TYPE
+ || TREE_CODE (constructor_type) == UNION_TYPE)
+ {
+ /* Don't die if there are extra init elts at the end. */
+ if (constructor_fields == 0)
+ constructor_type = 0;
+ else
+ {
+ constructor_type = TREE_TYPE (constructor_fields);
+ push_member_name (constructor_fields);
+ constructor_depth++;
+ }
+ }
+ else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
+ {
+ constructor_type = TREE_TYPE (constructor_type);
+ push_array_bounds (tree_low_cst (constructor_index, 0));
+ constructor_depth++;
+ }
-/* If we are saving up the elements rather than allocating them,
- this is the list of elements so far (in reverse order,
- most recent first). */
-static tree constructor_elements;
+ if (constructor_type == 0)
+ {
+ error_init ("extra brace group at end of initializer");
+ constructor_fields = 0;
+ constructor_unfilled_fields = 0;
+ return;
+ }
-/* 1 if constructor should be incrementally stored into a constructor chain,
- 0 if all the elements should be kept in AVL tree. */
-static int constructor_incremental;
+ if (value && TREE_CODE (value) == CONSTRUCTOR)
+ {
+ constructor_constant = TREE_CONSTANT (value);
+ constructor_simple = TREE_STATIC (value);
+ constructor_elements = CONSTRUCTOR_ELTS (value);
+ if (constructor_elements
+ && (TREE_CODE (constructor_type) == RECORD_TYPE
+ || TREE_CODE (constructor_type) == ARRAY_TYPE))
+ set_nonincremental_init ();
+ }
-/* 1 if so far this constructor's elements are all compile-time constants. */
-static int constructor_constant;
+ if (implicit == 1 && warn_missing_braces && !missing_braces_mentioned)
+ {
+ missing_braces_mentioned = 1;
+ warning_init ("missing braces around initializer");
+ }
-/* 1 if so far this constructor's elements are all valid address constants. */
-static int constructor_simple;
+ if (TREE_CODE (constructor_type) == RECORD_TYPE
+ || TREE_CODE (constructor_type) == UNION_TYPE)
+ {
+ constructor_fields = TYPE_FIELDS (constructor_type);
+ /* Skip any nameless bit fields at the beginning. */
+ while (constructor_fields != 0 && DECL_C_BIT_FIELD (constructor_fields)
+ && DECL_NAME (constructor_fields) == 0)
+ constructor_fields = TREE_CHAIN (constructor_fields);
-/* 1 if this constructor is erroneous so far. */
-static int constructor_erroneous;
+ constructor_unfilled_fields = constructor_fields;
+ constructor_bit_index = bitsize_zero_node;
+ }
+ else if (TREE_CODE (constructor_type) == VECTOR_TYPE)
+ {
+ /* Vectors are like simple fixed-size arrays. */
+ constructor_max_index =
+ build_int_2 (TYPE_VECTOR_SUBPARTS (constructor_type) - 1, 0);
+ constructor_index = convert (bitsizetype, integer_zero_node);
+ constructor_unfilled_index = constructor_index;
+ }
+ else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
+ {
+ if (TYPE_DOMAIN (constructor_type))
+ {
+ constructor_max_index
+ = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type));
-/* 1 if have called defer_addressed_constants. */
-static int constructor_subconstants_deferred;
+ /* Detect non-empty initializations of zero-length arrays. */
+ if (constructor_max_index == NULL_TREE
+ && TYPE_SIZE (constructor_type))
+ constructor_max_index = build_int_2 (-1, -1);
-/* Structure for managing pending initializer elements, organized as an
- AVL tree. */
+ /* constructor_max_index needs to be an INTEGER_CST. Attempts
+ to initialize VLAs will cause a proper error; avoid tree
+ checking errors as well by setting a safe value. */
+ if (constructor_max_index
+ && TREE_CODE (constructor_max_index) != INTEGER_CST)
+ constructor_max_index = build_int_2 (-1, -1);
-struct init_node
-{
- struct init_node *left, *right;
- struct init_node *parent;
- int balance;
- tree purpose;
- tree value;
-};
+ constructor_index
+ = convert (bitsizetype,
+ TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type)));
+ }
+ else
+ constructor_index = bitsize_zero_node;
-/* Tree of pending elements at this constructor level.
- These are elements encountered out of order
- which belong at places we haven't reached yet in actually
- writing the output.
- Will never hold tree nodes across GC runs. */
-static struct init_node *constructor_pending_elts;
+ constructor_unfilled_index = constructor_index;
+ if (value && TREE_CODE (value) == STRING_CST)
+ {
+ /* We need to split the char/wchar array into individual
+ characters, so that we don't have to special case it
+ everywhere. */
+ set_nonincremental_init_from_string (value);
+ }
+ }
+ else
+ {
+ warning_init ("braces around scalar initializer");
+ constructor_fields = constructor_type;
+ constructor_unfilled_fields = constructor_type;
+ }
+}
-/* The SPELLING_DEPTH of this constructor. */
-static int constructor_depth;
+/* At the end of an implicit or explicit brace level,
+ finish up that level of constructor.
+ If we were outputting the elements as they are read, return 0
+ from inner levels (process_init_element ignores that),
+ but return error_mark_node from the outermost level
+ (that's what we want to put in DECL_INITIAL).
+ Otherwise, return a CONSTRUCTOR expression. */
-/* 0 if implicitly pushing constructor levels is allowed. */
-int constructor_no_implicit = 0; /* 0 for C; 1 for some other languages. */
+tree
+pop_init_level (int implicit)
+{
+ struct constructor_stack *p;
+ tree constructor = 0;
-static int require_constant_value;
-static int require_constant_elements;
+ if (implicit == 0)
+ {
+ /* When we come to an explicit close brace,
+ pop any inner levels that didn't have explicit braces. */
+ while (constructor_stack->implicit)
+ process_init_element (pop_init_level (1));
-/* DECL node for which an initializer is being read.
- 0 means we are reading a constructor expression
- such as (struct foo) {...}. */
-static tree constructor_decl;
+ if (constructor_range_stack)
+ abort ();
+ }
-/* start_init saves the ASMSPEC arg here for really_start_incremental_init. */
-static const char *constructor_asmspec;
+ /* Now output all pending elements. */
+ constructor_incremental = 1;
+ output_pending_init_elements (1);
-/* Nonzero if this is an initializer for a top-level decl. */
-static int constructor_top_level;
+ p = constructor_stack;
-/* Nonzero if there were any member designators in this initializer. */
-static int constructor_designated;
+ /* Error for initializing a flexible array member, or a zero-length
+ array member in an inappropriate context. */
+ if (constructor_type && constructor_fields
+ && TREE_CODE (constructor_type) == ARRAY_TYPE
+ && TYPE_DOMAIN (constructor_type)
+ && ! TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type)))
+ {
+ /* Silently discard empty initializations. The parser will
+ already have pedwarned for empty brackets. */
+ if (integer_zerop (constructor_unfilled_index))
+ constructor_type = NULL_TREE;
+ else if (! TYPE_SIZE (constructor_type))
+ {
+ if (constructor_depth > 2)
+ error_init ("initialization of flexible array member in a nested context");
+ else if (pedantic)
+ pedwarn_init ("initialization of a flexible array member");
-/* Nesting depth of designator list. */
-static int designator_depth;
+ /* We have already issued an error message for the existence
+ of a flexible array member not at the end of the structure.
+ Discard the initializer so that we do not abort later. */
+ if (TREE_CHAIN (constructor_fields) != NULL_TREE)
+ constructor_type = NULL_TREE;
+ }
+ else
+ /* Zero-length arrays are no longer special, so we should no longer
+ get here. */
+ abort ();
+ }
-/* Nonzero if there were diagnosed errors in this designator list. */
-static int designator_errorneous;
+ /* Warn when some struct elements are implicitly initialized to zero. */
+ if (extra_warnings
+ && constructor_type
+ && TREE_CODE (constructor_type) == RECORD_TYPE
+ && constructor_unfilled_fields)
+ {
+ /* Do not warn for flexible array members or zero-length arrays. */
+ while (constructor_unfilled_fields
+ && (! DECL_SIZE (constructor_unfilled_fields)
+ || integer_zerop (DECL_SIZE (constructor_unfilled_fields))))
+ constructor_unfilled_fields = TREE_CHAIN (constructor_unfilled_fields);
-\f
-/* This stack has a level for each implicit or explicit level of
- structuring in the initializer, including the outermost one. It
- saves the values of most of the variables above. */
+ /* Do not warn if this level of the initializer uses member
+ designators; it is likely to be deliberate. */
+ if (constructor_unfilled_fields && !constructor_designated)
+ {
+ push_member_name (constructor_unfilled_fields);
+ warning_init ("missing initializer");
+ RESTORE_SPELLING_DEPTH (constructor_depth);
+ }
+ }
-struct constructor_range_stack;
+ /* Pad out the end of the structure. */
+ if (p->replacement_value)
+ /* If this closes a superfluous brace pair,
+ just pass out the element between them. */
+ constructor = p->replacement_value;
+ else if (constructor_type == 0)
+ ;
+ else if (TREE_CODE (constructor_type) != RECORD_TYPE
+ && TREE_CODE (constructor_type) != UNION_TYPE
+ && TREE_CODE (constructor_type) != ARRAY_TYPE
+ && TREE_CODE (constructor_type) != VECTOR_TYPE)
+ {
+ /* A nonincremental scalar initializer--just return
+ the element, after verifying there is just one. */
+ if (constructor_elements == 0)
+ {
+ if (!constructor_erroneous)
+ error_init ("empty scalar initializer");
+ constructor = error_mark_node;
+ }
+ else if (TREE_CHAIN (constructor_elements) != 0)
+ {
+ error_init ("extra elements in scalar initializer");
+ constructor = TREE_VALUE (constructor_elements);
+ }
+ else
+ constructor = TREE_VALUE (constructor_elements);
+ }
+ else
+ {
+ if (constructor_erroneous)
+ constructor = error_mark_node;
+ else
+ {
+ constructor = build_constructor (constructor_type,
+ nreverse (constructor_elements));
+ if (constructor_constant)
+ TREE_CONSTANT (constructor) = TREE_INVARIANT (constructor) = 1;
+ if (constructor_constant && constructor_simple)
+ TREE_STATIC (constructor) = 1;
+ }
+ }
-struct constructor_stack
-{
- struct constructor_stack *next;
- tree type;
- tree fields;
- tree index;
- tree max_index;
- tree unfilled_index;
- tree unfilled_fields;
- tree bit_index;
- tree elements;
- struct init_node *pending_elts;
- int offset;
- int depth;
- /* If nonzero, this value should replace the entire
- constructor at this level. */
- tree replacement_value;
- struct constructor_range_stack *range_stack;
- char constant;
- char simple;
- char implicit;
- char erroneous;
- char outer;
- char incremental;
- char designated;
-};
+ constructor_type = p->type;
+ constructor_fields = p->fields;
+ constructor_index = p->index;
+ constructor_max_index = p->max_index;
+ constructor_unfilled_index = p->unfilled_index;
+ constructor_unfilled_fields = p->unfilled_fields;
+ constructor_bit_index = p->bit_index;
+ constructor_elements = p->elements;
+ constructor_constant = p->constant;
+ constructor_simple = p->simple;
+ constructor_erroneous = p->erroneous;
+ constructor_incremental = p->incremental;
+ constructor_designated = p->designated;
+ constructor_pending_elts = p->pending_elts;
+ constructor_depth = p->depth;
+ if (!p->implicit)
+ constructor_range_stack = p->range_stack;
+ RESTORE_SPELLING_DEPTH (constructor_depth);
-struct constructor_stack *constructor_stack;
+ constructor_stack = p->next;
+ free (p);
-/* This stack represents designators from some range designator up to
- the last designator in the list. */
+ if (constructor == 0)
+ {
+ if (constructor_stack == 0)
+ return error_mark_node;
+ return NULL_TREE;
+ }
+ return constructor;
+}
-struct constructor_range_stack
+/* Common handling for both array range and field name designators.
+ ARRAY argument is nonzero for array ranges. Returns zero for success. */
+
+static int
+set_designator (int array)
{
- struct constructor_range_stack *next, *prev;
- struct constructor_stack *stack;
- tree range_start;
- tree index;
- tree range_end;
- tree fields;
-};
+ tree subtype;
+ enum tree_code subcode;
-struct constructor_range_stack *constructor_range_stack;
+ /* Don't die if an entire brace-pair level is superfluous
+ in the containing level. */
+ if (constructor_type == 0)
+ return 1;
-/* This stack records separate initializers that are nested.
- Nested initializers can't happen in ANSI C, but GNU C allows them
- in cases like { ... (struct foo) { ... } ... }. */
+ /* If there were errors in this designator list already, bail out silently. */
+ if (designator_errorneous)
+ return 1;
-struct initializer_stack
-{
- struct initializer_stack *next;
- tree decl;
- const char *asmspec;
- struct constructor_stack *constructor_stack;
- struct constructor_range_stack *constructor_range_stack;
- tree elements;
- struct spelling *spelling;
- struct spelling *spelling_base;
- int spelling_size;
- char top_level;
- char require_constant_value;
- char require_constant_elements;
- char deferred;
-};
+ if (!designator_depth)
+ {
+ if (constructor_range_stack)
+ abort ();
-struct initializer_stack *initializer_stack;
-\f
-/* Prepare to parse and output the initializer for variable DECL. */
+ /* Designator list starts at the level of closest explicit
+ braces. */
+ while (constructor_stack->implicit)
+ process_init_element (pop_init_level (1));
+ constructor_designated = 1;
+ return 0;
+ }
-void
-start_init (decl, asmspec_tree, top_level)
- tree decl;
- tree asmspec_tree;
- int top_level;
-{
- const char *locus;
- struct initializer_stack *p
- = (struct initializer_stack *) xmalloc (sizeof (struct initializer_stack));
- const char *asmspec = 0;
+ if (constructor_no_implicit)
+ {
+ error_init ("initialization designators may not nest");
+ return 1;
+ }
- if (asmspec_tree)
- asmspec = TREE_STRING_POINTER (asmspec_tree);
+ if (TREE_CODE (constructor_type) == RECORD_TYPE
+ || TREE_CODE (constructor_type) == UNION_TYPE)
+ {
+ subtype = TREE_TYPE (constructor_fields);
+ if (subtype != error_mark_node)
+ subtype = TYPE_MAIN_VARIANT (subtype);
+ }
+ else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
+ {
+ subtype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type));
+ }
+ else
+ abort ();
- p->decl = constructor_decl;
- p->asmspec = constructor_asmspec;
- p->require_constant_value = require_constant_value;
- p->require_constant_elements = require_constant_elements;
- p->constructor_stack = constructor_stack;
- p->constructor_range_stack = constructor_range_stack;
- p->elements = constructor_elements;
- p->spelling = spelling;
- p->spelling_base = spelling_base;
- p->spelling_size = spelling_size;
- p->deferred = constructor_subconstants_deferred;
- p->top_level = constructor_top_level;
- p->next = initializer_stack;
- initializer_stack = p;
-
- constructor_decl = decl;
- constructor_asmspec = asmspec;
- constructor_subconstants_deferred = 0;
- constructor_designated = 0;
- constructor_top_level = top_level;
-
- if (decl != 0)
+ subcode = TREE_CODE (subtype);
+ if (array && subcode != ARRAY_TYPE)
{
- require_constant_value = TREE_STATIC (decl);
- require_constant_elements
- = ((TREE_STATIC (decl) || (pedantic && !flag_isoc99))
- /* For a scalar, you can always use any value to initialize,
- even within braces. */
- && (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
- || TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
- || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE
- || TREE_CODE (TREE_TYPE (decl)) == QUAL_UNION_TYPE));
- locus = IDENTIFIER_POINTER (DECL_NAME (decl));
+ error_init ("array index in non-array initializer");
+ return 1;
}
- else
+ else if (!array && subcode != RECORD_TYPE && subcode != UNION_TYPE)
{
- require_constant_value = 0;
- require_constant_elements = 0;
- locus = "(anonymous)";
+ error_init ("field name not in record or union initializer");
+ return 1;
}
- constructor_stack = 0;
- constructor_range_stack = 0;
+ constructor_designated = 1;
+ push_init_level (2);
+ return 0;
+}
- missing_braces_mentioned = 0;
+/* If there are range designators in designator list, push a new designator
+ to constructor_range_stack. RANGE_END is end of such stack range or
+ NULL_TREE if there is no range designator at this level. */
- spelling_base = 0;
- spelling_size = 0;
- RESTORE_SPELLING_DEPTH (0);
+static void
+push_range_stack (tree range_end)
+{
+ struct constructor_range_stack *p;
- if (locus)
- push_string (locus);
+ p = ggc_alloc (sizeof (struct constructor_range_stack));
+ p->prev = constructor_range_stack;
+ p->next = 0;
+ p->fields = constructor_fields;
+ p->range_start = constructor_index;
+ p->index = constructor_index;
+ p->stack = constructor_stack;
+ p->range_end = range_end;
+ if (constructor_range_stack)
+ constructor_range_stack->next = p;
+ constructor_range_stack = p;
}
+/* Within an array initializer, specify the next index to be initialized.
+ FIRST is that index. If LAST is nonzero, then initialize a range
+ of indices, running from FIRST through LAST. */
+
void
-finish_init ()
+set_init_index (tree first, tree last)
{
- struct initializer_stack *p = initializer_stack;
+ if (set_designator (1))
+ return;
- /* Output subconstants (string constants, usually)
- that were referenced within this initializer and saved up.
- Must do this if and only if we called defer_addressed_constants. */
- if (constructor_subconstants_deferred)
- output_deferred_addressed_constants ();
+ designator_errorneous = 1;
- /* Free the whole constructor stack of this initializer. */
- while (constructor_stack)
+ while ((TREE_CODE (first) == NOP_EXPR
+ || TREE_CODE (first) == CONVERT_EXPR
+ || TREE_CODE (first) == NON_LVALUE_EXPR)
+ && (TYPE_MODE (TREE_TYPE (first))
+ == TYPE_MODE (TREE_TYPE (TREE_OPERAND (first, 0)))))
+ first = TREE_OPERAND (first, 0);
+
+ if (last)
+ while ((TREE_CODE (last) == NOP_EXPR
+ || TREE_CODE (last) == CONVERT_EXPR
+ || TREE_CODE (last) == NON_LVALUE_EXPR)
+ && (TYPE_MODE (TREE_TYPE (last))
+ == TYPE_MODE (TREE_TYPE (TREE_OPERAND (last, 0)))))
+ last = TREE_OPERAND (last, 0);
+
+ if (TREE_CODE (first) != INTEGER_CST)
+ error_init ("nonconstant array index in initializer");
+ else if (last != 0 && TREE_CODE (last) != INTEGER_CST)
+ error_init ("nonconstant array index in initializer");
+ else if (TREE_CODE (constructor_type) != ARRAY_TYPE)
+ error_init ("array index in non-array initializer");
+ else if (tree_int_cst_sgn (first) == -1)
+ error_init ("array index in initializer exceeds array bounds");
+ else if (constructor_max_index
+ && tree_int_cst_lt (constructor_max_index, first))
+ error_init ("array index in initializer exceeds array bounds");
+ else
{
- struct constructor_stack *q = constructor_stack;
- constructor_stack = q->next;
- free (q);
- }
+ constructor_index = convert (bitsizetype, first);
- if (constructor_range_stack)
- abort ();
+ if (last)
+ {
+ if (tree_int_cst_equal (first, last))
+ last = 0;
+ else if (tree_int_cst_lt (last, first))
+ {
+ error_init ("empty index range in initializer");
+ last = 0;
+ }
+ else
+ {
+ last = convert (bitsizetype, last);
+ if (constructor_max_index != 0
+ && tree_int_cst_lt (constructor_max_index, last))
+ {
+ error_init ("array index range in initializer exceeds array bounds");
+ last = 0;
+ }
+ }
+ }
- /* Pop back to the data of the outer initializer (if any). */
- constructor_decl = p->decl;
- constructor_asmspec = p->asmspec;
- require_constant_value = p->require_constant_value;
- require_constant_elements = p->require_constant_elements;
- constructor_stack = p->constructor_stack;
- constructor_range_stack = p->constructor_range_stack;
- constructor_elements = p->elements;
- spelling = p->spelling;
- spelling_base = p->spelling_base;
- spelling_size = p->spelling_size;
- constructor_subconstants_deferred = p->deferred;
- constructor_top_level = p->top_level;
- initializer_stack = p->next;
- free (p);
+ designator_depth++;
+ designator_errorneous = 0;
+ if (constructor_range_stack || last)
+ push_range_stack (last);
+ }
}
-\f
-/* Call here when we see the initializer is surrounded by braces.
- This is instead of a call to push_init_level;
- it is matched by a call to pop_init_level.
- TYPE is the type to initialize, for a constructor expression.
- For an initializer for a decl, TYPE is zero. */
+/* Within a struct initializer, specify the next field to be initialized. */
void
-really_start_incremental_init (type)
- tree type;
+set_init_label (tree fieldname)
{
- struct constructor_stack *p
- = (struct constructor_stack *) xmalloc (sizeof (struct constructor_stack));
-
- if (type == 0)
- type = TREE_TYPE (constructor_decl);
+ tree tail;
- p->type = constructor_type;
- p->fields = constructor_fields;
- p->index = constructor_index;
- p->max_index = constructor_max_index;
- p->unfilled_index = constructor_unfilled_index;
- p->unfilled_fields = constructor_unfilled_fields;
- p->bit_index = constructor_bit_index;
- p->elements = constructor_elements;
- p->constant = constructor_constant;
- p->simple = constructor_simple;
- p->erroneous = constructor_erroneous;
- p->pending_elts = constructor_pending_elts;
- p->depth = constructor_depth;
- p->replacement_value = 0;
- p->implicit = 0;
- p->range_stack = 0;
- p->outer = 0;
- p->incremental = constructor_incremental;
- p->designated = constructor_designated;
- p->next = 0;
- constructor_stack = p;
+ if (set_designator (0))
+ return;
- constructor_constant = 1;
- constructor_simple = 1;
- constructor_depth = SPELLING_DEPTH ();
- constructor_elements = 0;
- constructor_pending_elts = 0;
- constructor_type = type;
- constructor_incremental = 1;
- constructor_designated = 0;
- designator_depth = 0;
- designator_errorneous = 0;
+ designator_errorneous = 1;
- if (TREE_CODE (constructor_type) == RECORD_TYPE
- || TREE_CODE (constructor_type) == UNION_TYPE)
+ if (TREE_CODE (constructor_type) != RECORD_TYPE
+ && TREE_CODE (constructor_type) != UNION_TYPE)
{
- constructor_fields = TYPE_FIELDS (constructor_type);
- /* Skip any nameless bit fields at the beginning. */
- while (constructor_fields != 0 && DECL_C_BIT_FIELD (constructor_fields)
- && DECL_NAME (constructor_fields) == 0)
- constructor_fields = TREE_CHAIN (constructor_fields);
-
- constructor_unfilled_fields = constructor_fields;
- constructor_bit_index = bitsize_zero_node;
+ error_init ("field name not in record or union initializer");
+ return;
}
- else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
- {
- if (TYPE_DOMAIN (constructor_type))
- {
- constructor_max_index
- = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type));
-
- /* Detect non-empty initializations of zero-length arrays. */
- if (constructor_max_index == NULL_TREE
- && TYPE_SIZE (constructor_type))
- constructor_max_index = build_int_2 (-1, -1);
-
- /* constructor_max_index needs to be an INTEGER_CST. Attempts
- to initialize VLAs will cause a proper error; avoid tree
- checking errors as well by setting a safe value. */
- if (constructor_max_index
- && TREE_CODE (constructor_max_index) != INTEGER_CST)
- constructor_max_index = build_int_2 (-1, -1);
-
- constructor_index
- = convert (bitsizetype,
- TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type)));
- }
- else
- constructor_index = bitsize_zero_node;
- constructor_unfilled_index = constructor_index;
- }
- else if (TREE_CODE (constructor_type) == VECTOR_TYPE)
+ for (tail = TYPE_FIELDS (constructor_type); tail;
+ tail = TREE_CHAIN (tail))
{
- /* Vectors are like simple fixed-size arrays. */
- constructor_max_index =
- build_int_2 (TYPE_VECTOR_SUBPARTS (constructor_type) - 1, 0);
- constructor_index = convert (bitsizetype, bitsize_zero_node);
- constructor_unfilled_index = constructor_index;
+ if (DECL_NAME (tail) == fieldname)
+ break;
}
+
+ if (tail == 0)
+ error ("unknown field `%s' specified in initializer",
+ IDENTIFIER_POINTER (fieldname));
else
{
- /* Handle the case of int x = {5}; */
- constructor_fields = constructor_type;
- constructor_unfilled_fields = constructor_type;
- }
-}
+ constructor_fields = tail;
+ designator_depth++;
+ designator_errorneous = 0;
+ if (constructor_range_stack)
+ push_range_stack (NULL_TREE);
+ }
+}
\f
-/* Push down into a subobject, for initialization.
- If this is for an explicit set of braces, IMPLICIT is 0.
- If it is because the next element belongs at a lower level,
- IMPLICIT is 1 (or 2 if the push is because of designator list). */
+/* Add a new initializer to the tree of pending initializers. PURPOSE
+ identifies the initializer, either array index or field in a structure.
+ VALUE is the value of that index or field. */
-void
-push_init_level (implicit)
- int implicit;
+static void
+add_pending_init (tree purpose, tree value)
{
- struct constructor_stack *p;
- tree value = NULL_TREE;
-
- /* If we've exhausted any levels that didn't have braces,
- pop them now. */
- while (constructor_stack->implicit)
- {
- if ((TREE_CODE (constructor_type) == RECORD_TYPE
- || TREE_CODE (constructor_type) == UNION_TYPE)
- && constructor_fields == 0)
- process_init_element (pop_init_level (1));
- else if (TREE_CODE (constructor_type) == ARRAY_TYPE
- && tree_int_cst_lt (constructor_max_index, constructor_index))
- process_init_element (pop_init_level (1));
- else
- break;
- }
-
- /* Unless this is an explicit brace, we need to preserve previous
- content if any. */
- if (implicit)
- {
- if ((TREE_CODE (constructor_type) == RECORD_TYPE
- || TREE_CODE (constructor_type) == UNION_TYPE)
- && constructor_fields)
- value = find_init_member (constructor_fields);
- else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
- value = find_init_member (constructor_index);
- }
-
- p = (struct constructor_stack *) xmalloc (sizeof (struct constructor_stack));
- p->type = constructor_type;
- p->fields = constructor_fields;
- p->index = constructor_index;
- p->max_index = constructor_max_index;
- p->unfilled_index = constructor_unfilled_index;
- p->unfilled_fields = constructor_unfilled_fields;
- p->bit_index = constructor_bit_index;
- p->elements = constructor_elements;
- p->constant = constructor_constant;
- p->simple = constructor_simple;
- p->erroneous = constructor_erroneous;
- p->pending_elts = constructor_pending_elts;
- p->depth = constructor_depth;
- p->replacement_value = 0;
- p->implicit = implicit;
- p->outer = 0;
- p->incremental = constructor_incremental;
- p->designated = constructor_designated;
- p->next = constructor_stack;
- p->range_stack = 0;
- constructor_stack = p;
+ struct init_node *p, **q, *r;
- constructor_constant = 1;
- constructor_simple = 1;
- constructor_depth = SPELLING_DEPTH ();
- constructor_elements = 0;
- constructor_incremental = 1;
- constructor_designated = 0;
- constructor_pending_elts = 0;
- if (!implicit)
- {
- p->range_stack = constructor_range_stack;
- constructor_range_stack = 0;
- designator_depth = 0;
- designator_errorneous = 0;
- }
+ q = &constructor_pending_elts;
+ p = 0;
- /* Don't die if an entire brace-pair level is superfluous
- in the containing level. */
- if (constructor_type == 0)
- ;
- else if (TREE_CODE (constructor_type) == RECORD_TYPE
- || TREE_CODE (constructor_type) == UNION_TYPE)
+ if (TREE_CODE (constructor_type) == ARRAY_TYPE)
{
- /* Don't die if there are extra init elts at the end. */
- if (constructor_fields == 0)
- constructor_type = 0;
- else
+ while (*q != 0)
{
- constructor_type = TREE_TYPE (constructor_fields);
- push_member_name (constructor_fields);
- constructor_depth++;
+ p = *q;
+ if (tree_int_cst_lt (purpose, p->purpose))
+ q = &p->left;
+ else if (tree_int_cst_lt (p->purpose, purpose))
+ q = &p->right;
+ else
+ {
+ if (TREE_SIDE_EFFECTS (p->value))
+ warning_init ("initialized field with side-effects overwritten");
+ p->value = value;
+ return;
+ }
}
}
- else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
+ else
{
- constructor_type = TREE_TYPE (constructor_type);
- push_array_bounds (tree_low_cst (constructor_index, 0));
- constructor_depth++;
- }
+ tree bitpos;
- if (constructor_type == 0)
- {
- error_init ("extra brace group at end of initializer");
- constructor_fields = 0;
- constructor_unfilled_fields = 0;
- return;
+ bitpos = bit_position (purpose);
+ while (*q != NULL)
+ {
+ p = *q;
+ if (tree_int_cst_lt (bitpos, bit_position (p->purpose)))
+ q = &p->left;
+ else if (p->purpose != purpose)
+ q = &p->right;
+ else
+ {
+ if (TREE_SIDE_EFFECTS (p->value))
+ warning_init ("initialized field with side-effects overwritten");
+ p->value = value;
+ return;
+ }
+ }
}
- if (value && TREE_CODE (value) == CONSTRUCTOR)
- {
- constructor_constant = TREE_CONSTANT (value);
- constructor_simple = TREE_STATIC (value);
- constructor_elements = TREE_OPERAND (value, 1);
- if (constructor_elements
- && (TREE_CODE (constructor_type) == RECORD_TYPE
- || TREE_CODE (constructor_type) == ARRAY_TYPE))
- set_nonincremental_init ();
- }
+ r = ggc_alloc (sizeof (struct init_node));
+ r->purpose = purpose;
+ r->value = value;
- if (implicit == 1 && warn_missing_braces && !missing_braces_mentioned)
- {
- missing_braces_mentioned = 1;
- warning_init ("missing braces around initializer");
- }
+ *q = r;
+ r->parent = p;
+ r->left = 0;
+ r->right = 0;
+ r->balance = 0;
- if (TREE_CODE (constructor_type) == RECORD_TYPE
- || TREE_CODE (constructor_type) == UNION_TYPE)
+ while (p)
{
- constructor_fields = TYPE_FIELDS (constructor_type);
- /* Skip any nameless bit fields at the beginning. */
- while (constructor_fields != 0 && DECL_C_BIT_FIELD (constructor_fields)
- && DECL_NAME (constructor_fields) == 0)
- constructor_fields = TREE_CHAIN (constructor_fields);
+ struct init_node *s;
- constructor_unfilled_fields = constructor_fields;
- constructor_bit_index = bitsize_zero_node;
- }
- else if (TREE_CODE (constructor_type) == VECTOR_TYPE)
- {
- /* Vectors are like simple fixed-size arrays. */
- constructor_max_index =
- build_int_2 (TYPE_VECTOR_SUBPARTS (constructor_type) - 1, 0);
- constructor_index = convert (bitsizetype, integer_zero_node);
- constructor_unfilled_index = constructor_index;
- }
- else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
- {
- if (TYPE_DOMAIN (constructor_type))
+ if (r == p->left)
{
- constructor_max_index
- = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type));
+ if (p->balance == 0)
+ p->balance = -1;
+ else if (p->balance < 0)
+ {
+ if (r->balance < 0)
+ {
+ /* L rotation. */
+ p->left = r->right;
+ if (p->left)
+ p->left->parent = p;
+ r->right = p;
- /* Detect non-empty initializations of zero-length arrays. */
- if (constructor_max_index == NULL_TREE
- && TYPE_SIZE (constructor_type))
- constructor_max_index = build_int_2 (-1, -1);
+ p->balance = 0;
+ r->balance = 0;
- /* constructor_max_index needs to be an INTEGER_CST. Attempts
- to initialize VLAs will cause a proper error; avoid tree
- checking errors as well by setting a safe value. */
- if (constructor_max_index
- && TREE_CODE (constructor_max_index) != INTEGER_CST)
- constructor_max_index = build_int_2 (-1, -1);
+ s = p->parent;
+ p->parent = r;
+ r->parent = s;
+ if (s)
+ {
+ if (s->left == p)
+ s->left = r;
+ else
+ s->right = r;
+ }
+ else
+ constructor_pending_elts = r;
+ }
+ else
+ {
+ /* LR rotation. */
+ struct init_node *t = r->right;
- constructor_index
- = convert (bitsizetype,
- TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type)));
- }
- else
- constructor_index = bitsize_zero_node;
+ r->right = t->left;
+ if (r->right)
+ r->right->parent = r;
+ t->left = r;
- constructor_unfilled_index = constructor_index;
- if (value && TREE_CODE (value) == STRING_CST)
- {
- /* We need to split the char/wchar array into individual
- characters, so that we don't have to special case it
- everywhere. */
- set_nonincremental_init_from_string (value);
- }
- }
- else
- {
- warning_init ("braces around scalar initializer");
- constructor_fields = constructor_type;
- constructor_unfilled_fields = constructor_type;
- }
-}
+ p->left = t->right;
+ if (p->left)
+ p->left->parent = p;
+ t->right = p;
-/* At the end of an implicit or explicit brace level,
- finish up that level of constructor.
- If we were outputting the elements as they are read, return 0
- from inner levels (process_init_element ignores that),
- but return error_mark_node from the outermost level
- (that's what we want to put in DECL_INITIAL).
- Otherwise, return a CONSTRUCTOR expression. */
+ p->balance = t->balance < 0;
+ r->balance = -(t->balance > 0);
+ t->balance = 0;
-tree
-pop_init_level (implicit)
- int implicit;
-{
- struct constructor_stack *p;
- tree constructor = 0;
+ s = p->parent;
+ p->parent = t;
+ r->parent = t;
+ t->parent = s;
+ if (s)
+ {
+ if (s->left == p)
+ s->left = t;
+ else
+ s->right = t;
+ }
+ else
+ constructor_pending_elts = t;
+ }
+ break;
+ }
+ else
+ {
+ /* p->balance == +1; growth of left side balances the node. */
+ p->balance = 0;
+ break;
+ }
+ }
+ else /* r == p->right */
+ {
+ if (p->balance == 0)
+ /* Growth propagation from right side. */
+ p->balance++;
+ else if (p->balance > 0)
+ {
+ if (r->balance > 0)
+ {
+ /* R rotation. */
+ p->right = r->left;
+ if (p->right)
+ p->right->parent = p;
+ r->left = p;
- if (implicit == 0)
- {
- /* When we come to an explicit close brace,
- pop any inner levels that didn't have explicit braces. */
- while (constructor_stack->implicit)
- process_init_element (pop_init_level (1));
+ p->balance = 0;
+ r->balance = 0;
- if (constructor_range_stack)
- abort ();
- }
+ s = p->parent;
+ p->parent = r;
+ r->parent = s;
+ if (s)
+ {
+ if (s->left == p)
+ s->left = r;
+ else
+ s->right = r;
+ }
+ else
+ constructor_pending_elts = r;
+ }
+ else /* r->balance == -1 */
+ {
+ /* RL rotation */
+ struct init_node *t = r->left;
- p = constructor_stack;
+ r->left = t->right;
+ if (r->left)
+ r->left->parent = r;
+ t->right = r;
- /* Error for initializing a flexible array member, or a zero-length
- array member in an inappropriate context. */
- if (constructor_type && constructor_fields
- && TREE_CODE (constructor_type) == ARRAY_TYPE
- && TYPE_DOMAIN (constructor_type)
- && ! TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type)))
- {
- /* Silently discard empty initializations. The parser will
- already have pedwarned for empty brackets. */
- if (integer_zerop (constructor_unfilled_index))
- constructor_type = NULL_TREE;
- else if (! TYPE_SIZE (constructor_type))
- {
- if (constructor_depth > 2)
- error_init ("initialization of flexible array member in a nested context");
- else if (pedantic)
- pedwarn_init ("initialization of a flexible array member");
+ p->right = t->left;
+ if (p->right)
+ p->right->parent = p;
+ t->left = p;
- /* We have already issued an error message for the existence
- of a flexible array member not at the end of the structure.
- Discard the initializer so that we do not abort later. */
- if (TREE_CHAIN (constructor_fields) != NULL_TREE)
- constructor_type = NULL_TREE;
+ r->balance = (t->balance < 0);
+ p->balance = -(t->balance > 0);
+ t->balance = 0;
+
+ s = p->parent;
+ p->parent = t;
+ r->parent = t;
+ t->parent = s;
+ if (s)
+ {
+ if (s->left == p)
+ s->left = t;
+ else
+ s->right = t;
+ }
+ else
+ constructor_pending_elts = t;
+ }
+ break;
+ }
+ else
+ {
+ /* p->balance == -1; growth of right side balances the node. */
+ p->balance = 0;
+ break;
+ }
}
- else
- /* Zero-length arrays are no longer special, so we should no longer
- get here. */
- abort ();
+
+ r = p;
+ p = p->parent;
}
+}
- /* Warn when some struct elements are implicitly initialized to zero. */
- if (extra_warnings
- && constructor_type
- && TREE_CODE (constructor_type) == RECORD_TYPE
- && constructor_unfilled_fields)
- {
- /* Do not warn for flexible array members or zero-length arrays. */
- while (constructor_unfilled_fields
- && (! DECL_SIZE (constructor_unfilled_fields)
- || integer_zerop (DECL_SIZE (constructor_unfilled_fields))))
- constructor_unfilled_fields = TREE_CHAIN (constructor_unfilled_fields);
+/* Build AVL tree from a sorted chain. */
- /* Do not warn if this level of the initializer uses member
- designators; it is likely to be deliberate. */
- if (constructor_unfilled_fields && !constructor_designated)
- {
- push_member_name (constructor_unfilled_fields);
- warning_init ("missing initializer");
- RESTORE_SPELLING_DEPTH (constructor_depth);
- }
- }
+static void
+set_nonincremental_init (void)
+{
+ tree chain;
- /* Now output all pending elements. */
- constructor_incremental = 1;
- output_pending_init_elements (1);
+ if (TREE_CODE (constructor_type) != RECORD_TYPE
+ && TREE_CODE (constructor_type) != ARRAY_TYPE)
+ return;
- /* Pad out the end of the structure. */
- if (p->replacement_value)
- /* If this closes a superfluous brace pair,
- just pass out the element between them. */
- constructor = p->replacement_value;
- else if (constructor_type == 0)
- ;
- else if (TREE_CODE (constructor_type) != RECORD_TYPE
- && TREE_CODE (constructor_type) != UNION_TYPE
- && TREE_CODE (constructor_type) != ARRAY_TYPE
- && TREE_CODE (constructor_type) != VECTOR_TYPE)
+ for (chain = constructor_elements; chain; chain = TREE_CHAIN (chain))
+ add_pending_init (TREE_PURPOSE (chain), TREE_VALUE (chain));
+ constructor_elements = 0;
+ if (TREE_CODE (constructor_type) == RECORD_TYPE)
{
- /* A nonincremental scalar initializer--just return
- the element, after verifying there is just one. */
- if (constructor_elements == 0)
- {
- if (!constructor_erroneous)
- error_init ("empty scalar initializer");
- constructor = error_mark_node;
- }
- else if (TREE_CHAIN (constructor_elements) != 0)
- {
- error_init ("extra elements in scalar initializer");
- constructor = TREE_VALUE (constructor_elements);
- }
- else
- constructor = TREE_VALUE (constructor_elements);
+ constructor_unfilled_fields = TYPE_FIELDS (constructor_type);
+ /* Skip any nameless bit fields at the beginning. */
+ while (constructor_unfilled_fields != 0
+ && DECL_C_BIT_FIELD (constructor_unfilled_fields)
+ && DECL_NAME (constructor_unfilled_fields) == 0)
+ constructor_unfilled_fields = TREE_CHAIN (constructor_unfilled_fields);
+
}
- else
+ else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
{
- if (constructor_erroneous)
- constructor = error_mark_node;
+ if (TYPE_DOMAIN (constructor_type))
+ constructor_unfilled_index
+ = convert (bitsizetype,
+ TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type)));
else
- {
- constructor = build (CONSTRUCTOR, constructor_type, NULL_TREE,
- nreverse (constructor_elements));
- if (constructor_constant)
- TREE_CONSTANT (constructor) = 1;
- if (constructor_constant && constructor_simple)
- TREE_STATIC (constructor) = 1;
- }
+ constructor_unfilled_index = bitsize_zero_node;
}
+ constructor_incremental = 0;
+}
- constructor_type = p->type;
- constructor_fields = p->fields;
- constructor_index = p->index;
- constructor_max_index = p->max_index;
- constructor_unfilled_index = p->unfilled_index;
- constructor_unfilled_fields = p->unfilled_fields;
- constructor_bit_index = p->bit_index;
- constructor_elements = p->elements;
- constructor_constant = p->constant;
- constructor_simple = p->simple;
- constructor_erroneous = p->erroneous;
- constructor_incremental = p->incremental;
- constructor_designated = p->designated;
- constructor_pending_elts = p->pending_elts;
- constructor_depth = p->depth;
- if (!p->implicit)
- constructor_range_stack = p->range_stack;
- RESTORE_SPELLING_DEPTH (constructor_depth);
+/* Build AVL tree from a string constant. */
- constructor_stack = p->next;
- free (p);
+static void
+set_nonincremental_init_from_string (tree str)
+{
+ tree value, purpose, type;
+ HOST_WIDE_INT val[2];
+ const char *p, *end;
+ int byte, wchar_bytes, charwidth, bitpos;
- if (constructor == 0)
- {
- if (constructor_stack == 0)
- return error_mark_node;
- return NULL_TREE;
- }
- return constructor;
-}
-
-/* Common handling for both array range and field name designators.
- ARRAY argument is nonzero for array ranges. Returns zero for success. */
-
-static int
-set_designator (array)
- int array;
-{
- tree subtype;
- enum tree_code subcode;
-
- /* Don't die if an entire brace-pair level is superfluous
- in the containing level. */
- if (constructor_type == 0)
- return 1;
-
- /* If there were errors in this designator list already, bail out silently. */
- if (designator_errorneous)
- return 1;
-
- if (!designator_depth)
- {
- if (constructor_range_stack)
- abort ();
-
- /* Designator list starts at the level of closest explicit
- braces. */
- while (constructor_stack->implicit)
- process_init_element (pop_init_level (1));
- constructor_designated = 1;
- return 0;
- }
-
- if (constructor_no_implicit)
- {
- error_init ("initialization designators may not nest");
- return 1;
- }
+ if (TREE_CODE (constructor_type) != ARRAY_TYPE)
+ abort ();
- if (TREE_CODE (constructor_type) == RECORD_TYPE
- || TREE_CODE (constructor_type) == UNION_TYPE)
- {
- subtype = TREE_TYPE (constructor_fields);
- if (subtype != error_mark_node)
- subtype = TYPE_MAIN_VARIANT (subtype);
- }
- else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
- {
- subtype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type));
- }
+ if (TYPE_PRECISION (TREE_TYPE (TREE_TYPE (str)))
+ == TYPE_PRECISION (char_type_node))
+ wchar_bytes = 1;
+ else if (TYPE_PRECISION (TREE_TYPE (TREE_TYPE (str)))
+ == TYPE_PRECISION (wchar_type_node))
+ wchar_bytes = TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT;
else
abort ();
- subcode = TREE_CODE (subtype);
- if (array && subcode != ARRAY_TYPE)
- {
- error_init ("array index in non-array initializer");
- return 1;
- }
- else if (!array && subcode != RECORD_TYPE && subcode != UNION_TYPE)
- {
- error_init ("field name not in record or union initializer");
- return 1;
- }
-
- constructor_designated = 1;
- push_init_level (2);
- return 0;
-}
-
-/* If there are range designators in designator list, push a new designator
- to constructor_range_stack. RANGE_END is end of such stack range or
- NULL_TREE if there is no range designator at this level. */
-
-static void
-push_range_stack (range_end)
- tree range_end;
-{
- struct constructor_range_stack *p;
-
- p = (struct constructor_range_stack *)
- ggc_alloc (sizeof (struct constructor_range_stack));
- p->prev = constructor_range_stack;
- p->next = 0;
- p->fields = constructor_fields;
- p->range_start = constructor_index;
- p->index = constructor_index;
- p->stack = constructor_stack;
- p->range_end = range_end;
- if (constructor_range_stack)
- constructor_range_stack->next = p;
- constructor_range_stack = p;
-}
-
-/* Within an array initializer, specify the next index to be initialized.
- FIRST is that index. If LAST is nonzero, then initialize a range
- of indices, running from FIRST through LAST. */
-
-void
-set_init_index (first, last)
- tree first, last;
-{
- if (set_designator (1))
- return;
-
- designator_errorneous = 1;
-
- while ((TREE_CODE (first) == NOP_EXPR
- || TREE_CODE (first) == CONVERT_EXPR
- || TREE_CODE (first) == NON_LVALUE_EXPR)
- && (TYPE_MODE (TREE_TYPE (first))
- == TYPE_MODE (TREE_TYPE (TREE_OPERAND (first, 0)))))
- first = TREE_OPERAND (first, 0);
-
- if (last)
- while ((TREE_CODE (last) == NOP_EXPR
- || TREE_CODE (last) == CONVERT_EXPR
- || TREE_CODE (last) == NON_LVALUE_EXPR)
- && (TYPE_MODE (TREE_TYPE (last))
- == TYPE_MODE (TREE_TYPE (TREE_OPERAND (last, 0)))))
- last = TREE_OPERAND (last, 0);
+ charwidth = TYPE_PRECISION (char_type_node);
+ type = TREE_TYPE (constructor_type);
+ p = TREE_STRING_POINTER (str);
+ end = p + TREE_STRING_LENGTH (str);
- if (TREE_CODE (first) != INTEGER_CST)
- error_init ("nonconstant array index in initializer");
- else if (last != 0 && TREE_CODE (last) != INTEGER_CST)
- error_init ("nonconstant array index in initializer");
- else if (TREE_CODE (constructor_type) != ARRAY_TYPE)
- error_init ("array index in non-array initializer");
- else if (constructor_max_index
- && tree_int_cst_lt (constructor_max_index, first))
- error_init ("array index in initializer exceeds array bounds");
- else
+ for (purpose = bitsize_zero_node;
+ p < end && !tree_int_cst_lt (constructor_max_index, purpose);
+ purpose = size_binop (PLUS_EXPR, purpose, bitsize_one_node))
{
- constructor_index = convert (bitsizetype, first);
-
- if (last)
+ if (wchar_bytes == 1)
{
- if (tree_int_cst_equal (first, last))
- last = 0;
- else if (tree_int_cst_lt (last, first))
+ val[1] = (unsigned char) *p++;
+ val[0] = 0;
+ }
+ else
+ {
+ val[0] = 0;
+ val[1] = 0;
+ for (byte = 0; byte < wchar_bytes; byte++)
{
- error_init ("empty index range in initializer");
- last = 0;
+ if (BYTES_BIG_ENDIAN)
+ bitpos = (wchar_bytes - byte - 1) * charwidth;
+ else
+ bitpos = byte * charwidth;
+ val[bitpos < HOST_BITS_PER_WIDE_INT]
+ |= ((unsigned HOST_WIDE_INT) ((unsigned char) *p++))
+ << (bitpos % HOST_BITS_PER_WIDE_INT);
}
- else
+ }
+
+ if (!TYPE_UNSIGNED (type))
+ {
+ bitpos = ((wchar_bytes - 1) * charwidth) + HOST_BITS_PER_CHAR;
+ if (bitpos < HOST_BITS_PER_WIDE_INT)
{
- last = convert (bitsizetype, last);
- if (constructor_max_index != 0
- && tree_int_cst_lt (constructor_max_index, last))
+ if (val[1] & (((HOST_WIDE_INT) 1) << (bitpos - 1)))
{
- error_init ("array index range in initializer exceeds array bounds");
- last = 0;
+ val[1] |= ((HOST_WIDE_INT) -1) << bitpos;
+ val[0] = -1;
}
}
+ else if (bitpos == HOST_BITS_PER_WIDE_INT)
+ {
+ if (val[1] < 0)
+ val[0] = -1;
+ }
+ else if (val[0] & (((HOST_WIDE_INT) 1)
+ << (bitpos - 1 - HOST_BITS_PER_WIDE_INT)))
+ val[0] |= ((HOST_WIDE_INT) -1)
+ << (bitpos - HOST_BITS_PER_WIDE_INT);
}
- designator_depth++;
- designator_errorneous = 0;
- if (constructor_range_stack || last)
- push_range_stack (last);
+ value = build_int_2 (val[1], val[0]);
+ TREE_TYPE (value) = type;
+ add_pending_init (purpose, value);
}
+
+ constructor_incremental = 0;
}
-/* Within a struct initializer, specify the next field to be initialized. */
+/* Return value of FIELD in pending initializer or zero if the field was
+ not initialized yet. */
-void
-set_init_label (fieldname)
- tree fieldname;
+static tree
+find_init_member (tree field)
{
- tree tail;
-
- if (set_designator (0))
- return;
+ struct init_node *p;
- designator_errorneous = 1;
+ if (TREE_CODE (constructor_type) == ARRAY_TYPE)
+ {
+ if (constructor_incremental
+ && tree_int_cst_lt (field, constructor_unfilled_index))
+ set_nonincremental_init ();
- if (TREE_CODE (constructor_type) != RECORD_TYPE
- && TREE_CODE (constructor_type) != UNION_TYPE)
+ p = constructor_pending_elts;
+ while (p)
+ {
+ if (tree_int_cst_lt (field, p->purpose))
+ p = p->left;
+ else if (tree_int_cst_lt (p->purpose, field))
+ p = p->right;
+ else
+ return p->value;
+ }
+ }
+ else if (TREE_CODE (constructor_type) == RECORD_TYPE)
{
- error_init ("field name not in record or union initializer");
- return;
+ tree bitpos = bit_position (field);
+
+ if (constructor_incremental
+ && (!constructor_unfilled_fields
+ || tree_int_cst_lt (bitpos,
+ bit_position (constructor_unfilled_fields))))
+ set_nonincremental_init ();
+
+ p = constructor_pending_elts;
+ while (p)
+ {
+ if (field == p->purpose)
+ return p->value;
+ else if (tree_int_cst_lt (bitpos, bit_position (p->purpose)))
+ p = p->left;
+ else
+ p = p->right;
+ }
}
-
- for (tail = TYPE_FIELDS (constructor_type); tail;
- tail = TREE_CHAIN (tail))
+ else if (TREE_CODE (constructor_type) == UNION_TYPE)
{
- if (DECL_NAME (tail) == fieldname)
- break;
+ if (constructor_elements
+ && TREE_PURPOSE (constructor_elements) == field)
+ return TREE_VALUE (constructor_elements);
}
+ return 0;
+}
- if (tail == 0)
- error ("unknown field `%s' specified in initializer",
- IDENTIFIER_POINTER (fieldname));
- else
- {
- constructor_fields = tail;
- designator_depth++;
- designator_errorneous = 0;
- if (constructor_range_stack)
- push_range_stack (NULL_TREE);
- }
-}
-\f
-/* Add a new initializer to the tree of pending initializers. PURPOSE
- identifies the initializer, either array index or field in a structure.
- VALUE is the value of that index or field. */
+/* "Output" the next constructor element.
+ At top level, really output it to assembler code now.
+ Otherwise, collect it in a list from which we will make a CONSTRUCTOR.
+ TYPE is the data type that the containing data type wants here.
+ FIELD is the field (a FIELD_DECL) or the index that this element fills.
+
+ PENDING if non-nil means output pending elements that belong
+ right after this element. (PENDING is normally 1;
+ it is 0 while outputting pending elements, to avoid recursion.) */
static void
-add_pending_init (purpose, value)
- tree purpose, value;
+output_init_element (tree value, tree type, tree field, int pending)
{
- struct init_node *p, **q, *r;
+ if (type == error_mark_node)
+ {
+ constructor_erroneous = 1;
+ return;
+ }
+ if (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE
+ || (TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE
+ && !(TREE_CODE (value) == STRING_CST
+ && TREE_CODE (type) == ARRAY_TYPE
+ && TREE_CODE (TREE_TYPE (type)) == INTEGER_TYPE)
+ && !comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (value)),
+ TYPE_MAIN_VARIANT (type))))
+ value = default_conversion (value);
- q = &constructor_pending_elts;
- p = 0;
+ if (TREE_CODE (value) == COMPOUND_LITERAL_EXPR
+ && require_constant_value && !flag_isoc99 && pending)
+ {
+ /* As an extension, allow initializing objects with static storage
+ duration with compound literals (which are then treated just as
+ the brace enclosed list they contain). */
+ tree decl = COMPOUND_LITERAL_EXPR_DECL (value);
+ value = DECL_INITIAL (decl);
+ }
- if (TREE_CODE (constructor_type) == ARRAY_TYPE)
+ if (value == error_mark_node)
+ constructor_erroneous = 1;
+ else if (!TREE_CONSTANT (value))
+ constructor_constant = 0;
+ else if (initializer_constant_valid_p (value, TREE_TYPE (value)) == 0
+ || ((TREE_CODE (constructor_type) == RECORD_TYPE
+ || TREE_CODE (constructor_type) == UNION_TYPE)
+ && DECL_C_BIT_FIELD (field)
+ && TREE_CODE (value) != INTEGER_CST))
+ constructor_simple = 0;
+
+ if (require_constant_value && ! TREE_CONSTANT (value))
{
- while (*q != 0)
- {
- p = *q;
- if (tree_int_cst_lt (purpose, p->purpose))
- q = &p->left;
- else if (tree_int_cst_lt (p->purpose, purpose))
- q = &p->right;
- else
- {
- if (TREE_SIDE_EFFECTS (p->value))
- warning_init ("initialized field with side-effects overwritten");
- p->value = value;
- return;
- }
- }
+ error_init ("initializer element is not constant");
+ value = error_mark_node;
}
- else
+ else if (require_constant_elements
+ && initializer_constant_valid_p (value, TREE_TYPE (value)) == 0)
+ pedwarn ("initializer element is not computable at load time");
+
+ /* If this field is empty (and not at the end of structure),
+ don't do anything other than checking the initializer. */
+ if (field
+ && (TREE_TYPE (field) == error_mark_node
+ || (COMPLETE_TYPE_P (TREE_TYPE (field))
+ && integer_zerop (TYPE_SIZE (TREE_TYPE (field)))
+ && (TREE_CODE (constructor_type) == ARRAY_TYPE
+ || TREE_CHAIN (field)))))
+ return;
+
+ value = digest_init (type, value, require_constant_value);
+ if (value == error_mark_node)
{
- tree bitpos;
+ constructor_erroneous = 1;
+ return;
+ }
- bitpos = bit_position (purpose);
- while (*q != NULL)
+ /* If this element doesn't come next in sequence,
+ put it on constructor_pending_elts. */
+ if (TREE_CODE (constructor_type) == ARRAY_TYPE
+ && (!constructor_incremental
+ || !tree_int_cst_equal (field, constructor_unfilled_index)))
+ {
+ if (constructor_incremental
+ && tree_int_cst_lt (field, constructor_unfilled_index))
+ set_nonincremental_init ();
+
+ add_pending_init (field, value);
+ return;
+ }
+ else if (TREE_CODE (constructor_type) == RECORD_TYPE
+ && (!constructor_incremental
+ || field != constructor_unfilled_fields))
+ {
+ /* We do this for records but not for unions. In a union,
+ no matter which field is specified, it can be initialized
+ right away since it starts at the beginning of the union. */
+ if (constructor_incremental)
{
- p = *q;
- if (tree_int_cst_lt (bitpos, bit_position (p->purpose)))
- q = &p->left;
- else if (p->purpose != purpose)
- q = &p->right;
+ if (!constructor_unfilled_fields)
+ set_nonincremental_init ();
else
{
- if (TREE_SIDE_EFFECTS (p->value))
- warning_init ("initialized field with side-effects overwritten");
- p->value = value;
- return;
+ tree bitpos, unfillpos;
+
+ bitpos = bit_position (field);
+ unfillpos = bit_position (constructor_unfilled_fields);
+
+ if (tree_int_cst_lt (bitpos, unfillpos))
+ set_nonincremental_init ();
}
}
+
+ add_pending_init (field, value);
+ return;
}
+ else if (TREE_CODE (constructor_type) == UNION_TYPE
+ && constructor_elements)
+ {
+ if (TREE_SIDE_EFFECTS (TREE_VALUE (constructor_elements)))
+ warning_init ("initialized field with side-effects overwritten");
- r = (struct init_node *) ggc_alloc (sizeof (struct init_node));
- r->purpose = purpose;
- r->value = value;
+ /* We can have just one union field set. */
+ constructor_elements = 0;
+ }
- *q = r;
- r->parent = p;
- r->left = 0;
- r->right = 0;
- r->balance = 0;
+ /* Otherwise, output this element either to
+ constructor_elements or to the assembler file. */
- while (p)
+ if (field && TREE_CODE (field) == INTEGER_CST)
+ field = copy_node (field);
+ constructor_elements
+ = tree_cons (field, value, constructor_elements);
+
+ /* Advance the variable that indicates sequential elements output. */
+ if (TREE_CODE (constructor_type) == ARRAY_TYPE)
+ constructor_unfilled_index
+ = size_binop (PLUS_EXPR, constructor_unfilled_index,
+ bitsize_one_node);
+ else if (TREE_CODE (constructor_type) == RECORD_TYPE)
{
- struct init_node *s;
+ constructor_unfilled_fields
+ = TREE_CHAIN (constructor_unfilled_fields);
- if (r == p->left)
- {
- if (p->balance == 0)
- p->balance = -1;
- else if (p->balance < 0)
- {
- if (r->balance < 0)
- {
- /* L rotation. */
- p->left = r->right;
- if (p->left)
- p->left->parent = p;
- r->right = p;
+ /* Skip any nameless bit fields. */
+ while (constructor_unfilled_fields != 0
+ && DECL_C_BIT_FIELD (constructor_unfilled_fields)
+ && DECL_NAME (constructor_unfilled_fields) == 0)
+ constructor_unfilled_fields =
+ TREE_CHAIN (constructor_unfilled_fields);
+ }
+ else if (TREE_CODE (constructor_type) == UNION_TYPE)
+ constructor_unfilled_fields = 0;
- p->balance = 0;
- r->balance = 0;
+ /* Now output any pending elements which have become next. */
+ if (pending)
+ output_pending_init_elements (0);
+}
- s = p->parent;
- p->parent = r;
- r->parent = s;
- if (s)
- {
- if (s->left == p)
- s->left = r;
- else
- s->right = r;
- }
- else
- constructor_pending_elts = r;
- }
- else
- {
- /* LR rotation. */
- struct init_node *t = r->right;
+/* Output any pending elements which have become next.
+ As we output elements, constructor_unfilled_{fields,index}
+ advances, which may cause other elements to become next;
+ if so, they too are output.
- r->right = t->left;
- if (r->right)
- r->right->parent = r;
- t->left = r;
+ If ALL is 0, we return when there are
+ no more pending elements to output now.
- p->left = t->right;
- if (p->left)
- p->left->parent = p;
- t->right = p;
+ If ALL is 1, we output space as necessary so that
+ we can output all the pending elements. */
- p->balance = t->balance < 0;
- r->balance = -(t->balance > 0);
- t->balance = 0;
+static void
+output_pending_init_elements (int all)
+{
+ struct init_node *elt = constructor_pending_elts;
+ tree next;
- s = p->parent;
- p->parent = t;
- r->parent = t;
- t->parent = s;
- if (s)
- {
- if (s->left == p)
- s->left = t;
- else
- s->right = t;
- }
- else
- constructor_pending_elts = t;
- }
- break;
- }
- else
+ retry:
+
+ /* Look through the whole pending tree.
+ If we find an element that should be output now,
+ output it. Otherwise, set NEXT to the element
+ that comes first among those still pending. */
+
+ next = 0;
+ while (elt)
+ {
+ if (TREE_CODE (constructor_type) == ARRAY_TYPE)
+ {
+ if (tree_int_cst_equal (elt->purpose,
+ constructor_unfilled_index))
+ output_init_element (elt->value,
+ TREE_TYPE (constructor_type),
+ constructor_unfilled_index, 0);
+ else if (tree_int_cst_lt (constructor_unfilled_index,
+ elt->purpose))
{
- /* p->balance == +1; growth of left side balances the node. */
- p->balance = 0;
- break;
+ /* Advance to the next smaller node. */
+ if (elt->left)
+ elt = elt->left;
+ else
+ {
+ /* We have reached the smallest node bigger than the
+ current unfilled index. Fill the space first. */
+ next = elt->purpose;
+ break;
+ }
}
- }
- else /* r == p->right */
- {
- if (p->balance == 0)
- /* Growth propagation from right side. */
- p->balance++;
- else if (p->balance > 0)
+ else
{
- if (r->balance > 0)
+ /* Advance to the next bigger node. */
+ if (elt->right)
+ elt = elt->right;
+ else
{
- /* R rotation. */
- p->right = r->left;
- if (p->right)
- p->right->parent = p;
- r->left = p;
-
- p->balance = 0;
- r->balance = 0;
-
- s = p->parent;
- p->parent = r;
- r->parent = s;
- if (s)
+ /* We have reached the biggest node in a subtree. Find
+ the parent of it, which is the next bigger node. */
+ while (elt->parent && elt->parent->right == elt)
+ elt = elt->parent;
+ elt = elt->parent;
+ if (elt && tree_int_cst_lt (constructor_unfilled_index,
+ elt->purpose))
{
- if (s->left == p)
- s->left = r;
- else
- s->right = r;
+ next = elt->purpose;
+ break;
}
- else
- constructor_pending_elts = r;
}
- else /* r->balance == -1 */
- {
- /* RL rotation */
- struct init_node *t = r->left;
-
- r->left = t->right;
- if (r->left)
- r->left->parent = r;
- t->right = r;
-
- p->right = t->left;
- if (p->right)
- p->right->parent = p;
- t->left = p;
+ }
+ }
+ else if (TREE_CODE (constructor_type) == RECORD_TYPE
+ || TREE_CODE (constructor_type) == UNION_TYPE)
+ {
+ tree ctor_unfilled_bitpos, elt_bitpos;
- r->balance = (t->balance < 0);
- p->balance = -(t->balance > 0);
- t->balance = 0;
+ /* If the current record is complete we are done. */
+ if (constructor_unfilled_fields == 0)
+ break;
- s = p->parent;
- p->parent = t;
- r->parent = t;
- t->parent = s;
- if (s)
- {
- if (s->left == p)
- s->left = t;
- else
- s->right = t;
- }
- else
- constructor_pending_elts = t;
+ ctor_unfilled_bitpos = bit_position (constructor_unfilled_fields);
+ elt_bitpos = bit_position (elt->purpose);
+ /* We can't compare fields here because there might be empty
+ fields in between. */
+ if (tree_int_cst_equal (elt_bitpos, ctor_unfilled_bitpos))
+ {
+ constructor_unfilled_fields = elt->purpose;
+ output_init_element (elt->value, TREE_TYPE (elt->purpose),
+ elt->purpose, 0);
+ }
+ else if (tree_int_cst_lt (ctor_unfilled_bitpos, elt_bitpos))
+ {
+ /* Advance to the next smaller node. */
+ if (elt->left)
+ elt = elt->left;
+ else
+ {
+ /* We have reached the smallest node bigger than the
+ current unfilled field. Fill the space first. */
+ next = elt->purpose;
+ break;
}
- break;
}
else
{
- /* p->balance == -1; growth of right side balances the node. */
- p->balance = 0;
- break;
+ /* Advance to the next bigger node. */
+ if (elt->right)
+ elt = elt->right;
+ else
+ {
+ /* We have reached the biggest node in a subtree. Find
+ the parent of it, which is the next bigger node. */
+ while (elt->parent && elt->parent->right == elt)
+ elt = elt->parent;
+ elt = elt->parent;
+ if (elt
+ && (tree_int_cst_lt (ctor_unfilled_bitpos,
+ bit_position (elt->purpose))))
+ {
+ next = elt->purpose;
+ break;
+ }
+ }
}
}
-
- r = p;
- p = p->parent;
}
+
+ /* Ordinarily return, but not if we want to output all
+ and there are elements left. */
+ if (! (all && next != 0))
+ return;
+
+ /* If it's not incremental, just skip over the gap, so that after
+ jumping to retry we will output the next successive element. */
+ if (TREE_CODE (constructor_type) == RECORD_TYPE
+ || TREE_CODE (constructor_type) == UNION_TYPE)
+ constructor_unfilled_fields = next;
+ else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
+ constructor_unfilled_index = next;
+
+ /* ELT now points to the node in the pending tree with the next
+ initializer to output. */
+ goto retry;
}
+\f
+/* Add one non-braced element to the current constructor level.
+ This adjusts the current position within the constructor's type.
+ This may also start or terminate implicit levels
+ to handle a partly-braced initializer.
-/* Build AVL tree from a sorted chain. */
+ Once this has found the correct level for the new element,
+ it calls output_init_element. */
-static void
-set_nonincremental_init ()
+void
+process_init_element (tree value)
{
- tree chain;
+ tree orig_value = value;
+ int string_flag = value != 0 && TREE_CODE (value) == STRING_CST;
- if (TREE_CODE (constructor_type) != RECORD_TYPE
- && TREE_CODE (constructor_type) != ARRAY_TYPE)
- return;
+ designator_depth = 0;
+ designator_errorneous = 0;
- for (chain = constructor_elements; chain; chain = TREE_CHAIN (chain))
- add_pending_init (TREE_PURPOSE (chain), TREE_VALUE (chain));
- constructor_elements = 0;
- if (TREE_CODE (constructor_type) == RECORD_TYPE)
+ /* Handle superfluous braces around string cst as in
+ char x[] = {"foo"}; */
+ if (string_flag
+ && constructor_type
+ && TREE_CODE (constructor_type) == ARRAY_TYPE
+ && TREE_CODE (TREE_TYPE (constructor_type)) == INTEGER_TYPE
+ && integer_zerop (constructor_unfilled_index))
{
- constructor_unfilled_fields = TYPE_FIELDS (constructor_type);
- /* Skip any nameless bit fields at the beginning. */
- while (constructor_unfilled_fields != 0
- && DECL_C_BIT_FIELD (constructor_unfilled_fields)
- && DECL_NAME (constructor_unfilled_fields) == 0)
- constructor_unfilled_fields = TREE_CHAIN (constructor_unfilled_fields);
-
+ if (constructor_stack->replacement_value)
+ error_init ("excess elements in char array initializer");
+ constructor_stack->replacement_value = value;
+ return;
}
- else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
+
+ if (constructor_stack->replacement_value != 0)
{
- if (TYPE_DOMAIN (constructor_type))
- constructor_unfilled_index
- = convert (bitsizetype,
- TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type)));
- else
- constructor_unfilled_index = bitsize_zero_node;
+ error_init ("excess elements in struct initializer");
+ return;
}
- constructor_incremental = 0;
-}
-/* Build AVL tree from a string constant. */
+ /* Ignore elements of a brace group if it is entirely superfluous
+ and has already been diagnosed. */
+ if (constructor_type == 0)
+ return;
-static void
-set_nonincremental_init_from_string (str)
- tree str;
-{
- tree value, purpose, type;
- HOST_WIDE_INT val[2];
- const char *p, *end;
- int byte, wchar_bytes, charwidth, bitpos;
+ /* If we've exhausted any levels that didn't have braces,
+ pop them now. */
+ while (constructor_stack->implicit)
+ {
+ if ((TREE_CODE (constructor_type) == RECORD_TYPE
+ || TREE_CODE (constructor_type) == UNION_TYPE)
+ && constructor_fields == 0)
+ process_init_element (pop_init_level (1));
+ else if (TREE_CODE (constructor_type) == ARRAY_TYPE
+ && (constructor_max_index == 0
+ || tree_int_cst_lt (constructor_max_index,
+ constructor_index)))
+ process_init_element (pop_init_level (1));
+ else
+ break;
+ }
- if (TREE_CODE (constructor_type) != ARRAY_TYPE)
- abort ();
-
- if (TYPE_PRECISION (TREE_TYPE (TREE_TYPE (str)))
- == TYPE_PRECISION (char_type_node))
- wchar_bytes = 1;
- else if (TYPE_PRECISION (TREE_TYPE (TREE_TYPE (str)))
- == TYPE_PRECISION (wchar_type_node))
- wchar_bytes = TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT;
- else
- abort ();
-
- charwidth = TYPE_PRECISION (char_type_node);
- type = TREE_TYPE (constructor_type);
- p = TREE_STRING_POINTER (str);
- end = p + TREE_STRING_LENGTH (str);
+ /* In the case of [LO ... HI] = VALUE, only evaluate VALUE once. */
+ if (constructor_range_stack)
+ {
+ /* If value is a compound literal and we'll be just using its
+ content, don't put it into a SAVE_EXPR. */
+ if (TREE_CODE (value) != COMPOUND_LITERAL_EXPR
+ || !require_constant_value
+ || flag_isoc99)
+ value = save_expr (value);
+ }
- for (purpose = bitsize_zero_node;
- p < end && !tree_int_cst_lt (constructor_max_index, purpose);
- purpose = size_binop (PLUS_EXPR, purpose, bitsize_one_node))
+ while (1)
{
- if (wchar_bytes == 1)
- {
- val[1] = (unsigned char) *p++;
- val[0] = 0;
- }
- else
+ if (TREE_CODE (constructor_type) == RECORD_TYPE)
{
- val[0] = 0;
- val[1] = 0;
- for (byte = 0; byte < wchar_bytes; byte++)
+ tree fieldtype;
+ enum tree_code fieldcode;
+
+ if (constructor_fields == 0)
{
- if (BYTES_BIG_ENDIAN)
- bitpos = (wchar_bytes - byte - 1) * charwidth;
- else
- bitpos = byte * charwidth;
- val[bitpos < HOST_BITS_PER_WIDE_INT]
- |= ((unsigned HOST_WIDE_INT) ((unsigned char) *p++))
- << (bitpos % HOST_BITS_PER_WIDE_INT);
+ pedwarn_init ("excess elements in struct initializer");
+ break;
}
- }
- if (!TREE_UNSIGNED (type))
- {
- bitpos = ((wchar_bytes - 1) * charwidth) + HOST_BITS_PER_CHAR;
- if (bitpos < HOST_BITS_PER_WIDE_INT)
+ fieldtype = TREE_TYPE (constructor_fields);
+ if (fieldtype != error_mark_node)
+ fieldtype = TYPE_MAIN_VARIANT (fieldtype);
+ fieldcode = TREE_CODE (fieldtype);
+
+ /* Error for non-static initialization of a flexible array member. */
+ if (fieldcode == ARRAY_TYPE
+ && !require_constant_value
+ && TYPE_SIZE (fieldtype) == NULL_TREE
+ && TREE_CHAIN (constructor_fields) == NULL_TREE)
{
- if (val[1] & (((HOST_WIDE_INT) 1) << (bitpos - 1)))
- {
- val[1] |= ((HOST_WIDE_INT) -1) << bitpos;
- val[0] = -1;
- }
+ error_init ("non-static initialization of a flexible array member");
+ break;
}
- else if (bitpos == HOST_BITS_PER_WIDE_INT)
+
+ /* Accept a string constant to initialize a subarray. */
+ if (value != 0
+ && fieldcode == ARRAY_TYPE
+ && TREE_CODE (TREE_TYPE (fieldtype)) == INTEGER_TYPE
+ && string_flag)
+ value = orig_value;
+ /* Otherwise, if we have come to a subaggregate,
+ and we don't have an element of its type, push into it. */
+ else if (value != 0 && !constructor_no_implicit
+ && value != error_mark_node
+ && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != fieldtype
+ && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE
+ || fieldcode == UNION_TYPE))
{
- if (val[1] < 0)
- val[0] = -1;
+ push_init_level (1);
+ continue;
}
- else if (val[0] & (((HOST_WIDE_INT) 1)
- << (bitpos - 1 - HOST_BITS_PER_WIDE_INT)))
- val[0] |= ((HOST_WIDE_INT) -1)
- << (bitpos - HOST_BITS_PER_WIDE_INT);
- }
- value = build_int_2 (val[1], val[0]);
- TREE_TYPE (value) = type;
- add_pending_init (purpose, value);
- }
+ if (value)
+ {
+ push_member_name (constructor_fields);
+ output_init_element (value, fieldtype, constructor_fields, 1);
+ RESTORE_SPELLING_DEPTH (constructor_depth);
+ }
+ else
+ /* Do the bookkeeping for an element that was
+ directly output as a constructor. */
+ {
+ /* For a record, keep track of end position of last field. */
+ if (DECL_SIZE (constructor_fields))
+ constructor_bit_index
+ = size_binop (PLUS_EXPR,
+ bit_position (constructor_fields),
+ DECL_SIZE (constructor_fields));
- constructor_incremental = 0;
-}
+ /* If the current field was the first one not yet written out,
+ it isn't now, so update. */
+ if (constructor_unfilled_fields == constructor_fields)
+ {
+ constructor_unfilled_fields = TREE_CHAIN (constructor_fields);
+ /* Skip any nameless bit fields. */
+ while (constructor_unfilled_fields != 0
+ && DECL_C_BIT_FIELD (constructor_unfilled_fields)
+ && DECL_NAME (constructor_unfilled_fields) == 0)
+ constructor_unfilled_fields =
+ TREE_CHAIN (constructor_unfilled_fields);
+ }
+ }
-/* Return value of FIELD in pending initializer or zero if the field was
- not initialized yet. */
+ constructor_fields = TREE_CHAIN (constructor_fields);
+ /* Skip any nameless bit fields at the beginning. */
+ while (constructor_fields != 0
+ && DECL_C_BIT_FIELD (constructor_fields)
+ && DECL_NAME (constructor_fields) == 0)
+ constructor_fields = TREE_CHAIN (constructor_fields);
+ }
+ else if (TREE_CODE (constructor_type) == UNION_TYPE)
+ {
+ tree fieldtype;
+ enum tree_code fieldcode;
-static tree
-find_init_member (field)
- tree field;
-{
- struct init_node *p;
+ if (constructor_fields == 0)
+ {
+ pedwarn_init ("excess elements in union initializer");
+ break;
+ }
- if (TREE_CODE (constructor_type) == ARRAY_TYPE)
- {
- if (constructor_incremental
- && tree_int_cst_lt (field, constructor_unfilled_index))
- set_nonincremental_init ();
+ fieldtype = TREE_TYPE (constructor_fields);
+ if (fieldtype != error_mark_node)
+ fieldtype = TYPE_MAIN_VARIANT (fieldtype);
+ fieldcode = TREE_CODE (fieldtype);
- p = constructor_pending_elts;
- while (p)
- {
- if (tree_int_cst_lt (field, p->purpose))
- p = p->left;
- else if (tree_int_cst_lt (p->purpose, field))
- p = p->right;
- else
- return p->value;
- }
- }
- else if (TREE_CODE (constructor_type) == RECORD_TYPE)
- {
- tree bitpos = bit_position (field);
+ /* Warn that traditional C rejects initialization of unions.
+ We skip the warning if the value is zero. This is done
+ under the assumption that the zero initializer in user
+ code appears conditioned on e.g. __STDC__ to avoid
+ "missing initializer" warnings and relies on default
+ initialization to zero in the traditional C case.
+ We also skip the warning if the initializer is designated,
+ again on the assumption that this must be conditional on
+ __STDC__ anyway (and we've already complained about the
+ member-designator already). */
+ if (warn_traditional && !in_system_header && !constructor_designated
+ && !(value && (integer_zerop (value) || real_zerop (value))))
+ warning ("traditional C rejects initialization of unions");
- if (constructor_incremental
- && (!constructor_unfilled_fields
- || tree_int_cst_lt (bitpos,
- bit_position (constructor_unfilled_fields))))
- set_nonincremental_init ();
+ /* Accept a string constant to initialize a subarray. */
+ if (value != 0
+ && fieldcode == ARRAY_TYPE
+ && TREE_CODE (TREE_TYPE (fieldtype)) == INTEGER_TYPE
+ && string_flag)
+ value = orig_value;
+ /* Otherwise, if we have come to a subaggregate,
+ and we don't have an element of its type, push into it. */
+ else if (value != 0 && !constructor_no_implicit
+ && value != error_mark_node
+ && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != fieldtype
+ && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE
+ || fieldcode == UNION_TYPE))
+ {
+ push_init_level (1);
+ continue;
+ }
- p = constructor_pending_elts;
- while (p)
- {
- if (field == p->purpose)
- return p->value;
- else if (tree_int_cst_lt (bitpos, bit_position (p->purpose)))
- p = p->left;
+ if (value)
+ {
+ push_member_name (constructor_fields);
+ output_init_element (value, fieldtype, constructor_fields, 1);
+ RESTORE_SPELLING_DEPTH (constructor_depth);
+ }
else
- p = p->right;
- }
- }
- else if (TREE_CODE (constructor_type) == UNION_TYPE)
- {
- if (constructor_elements
- && TREE_PURPOSE (constructor_elements) == field)
- return TREE_VALUE (constructor_elements);
- }
- return 0;
-}
-
-/* "Output" the next constructor element.
- At top level, really output it to assembler code now.
- Otherwise, collect it in a list from which we will make a CONSTRUCTOR.
- TYPE is the data type that the containing data type wants here.
- FIELD is the field (a FIELD_DECL) or the index that this element fills.
+ /* Do the bookkeeping for an element that was
+ directly output as a constructor. */
+ {
+ constructor_bit_index = DECL_SIZE (constructor_fields);
+ constructor_unfilled_fields = TREE_CHAIN (constructor_fields);
+ }
- PENDING if non-nil means output pending elements that belong
- right after this element. (PENDING is normally 1;
- it is 0 while outputting pending elements, to avoid recursion.) */
+ constructor_fields = 0;
+ }
+ else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
+ {
+ tree elttype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type));
+ enum tree_code eltcode = TREE_CODE (elttype);
-static void
-output_init_element (value, type, field, pending)
- tree value, type, field;
- int pending;
-{
- if (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE
- || (TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE
- && !(TREE_CODE (value) == STRING_CST
- && TREE_CODE (type) == ARRAY_TYPE
- && TREE_CODE (TREE_TYPE (type)) == INTEGER_TYPE)
- && !comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (value)),
- TYPE_MAIN_VARIANT (type))))
- value = default_conversion (value);
+ /* Accept a string constant to initialize a subarray. */
+ if (value != 0
+ && eltcode == ARRAY_TYPE
+ && TREE_CODE (TREE_TYPE (elttype)) == INTEGER_TYPE
+ && string_flag)
+ value = orig_value;
+ /* Otherwise, if we have come to a subaggregate,
+ and we don't have an element of its type, push into it. */
+ else if (value != 0 && !constructor_no_implicit
+ && value != error_mark_node
+ && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != elttype
+ && (eltcode == RECORD_TYPE || eltcode == ARRAY_TYPE
+ || eltcode == UNION_TYPE))
+ {
+ push_init_level (1);
+ continue;
+ }
- if (TREE_CODE (value) == COMPOUND_LITERAL_EXPR
- && require_constant_value && !flag_isoc99 && pending)
- {
- /* As an extension, allow initializing objects with static storage
- duration with compound literals (which are then treated just as
- the brace enclosed list they contain). */
- tree decl = COMPOUND_LITERAL_EXPR_DECL (value);
- value = DECL_INITIAL (decl);
- }
+ if (constructor_max_index != 0
+ && (tree_int_cst_lt (constructor_max_index, constructor_index)
+ || integer_all_onesp (constructor_max_index)))
+ {
+ pedwarn_init ("excess elements in array initializer");
+ break;
+ }
- if (value == error_mark_node)
- constructor_erroneous = 1;
- else if (!TREE_CONSTANT (value))
- constructor_constant = 0;
- else if (initializer_constant_valid_p (value, TREE_TYPE (value)) == 0
- || ((TREE_CODE (constructor_type) == RECORD_TYPE
- || TREE_CODE (constructor_type) == UNION_TYPE)
- && DECL_C_BIT_FIELD (field)
- && TREE_CODE (value) != INTEGER_CST))
- constructor_simple = 0;
+ /* Now output the actual element. */
+ if (value)
+ {
+ push_array_bounds (tree_low_cst (constructor_index, 0));
+ output_init_element (value, elttype, constructor_index, 1);
+ RESTORE_SPELLING_DEPTH (constructor_depth);
+ }
- if (require_constant_value && ! TREE_CONSTANT (value))
- {
- error_init ("initializer element is not constant");
- value = error_mark_node;
- }
- else if (require_constant_elements
- && initializer_constant_valid_p (value, TREE_TYPE (value)) == 0)
- pedwarn ("initializer element is not computable at load time");
+ constructor_index
+ = size_binop (PLUS_EXPR, constructor_index, bitsize_one_node);
- /* If this field is empty (and not at the end of structure),
- don't do anything other than checking the initializer. */
- if (field
- && (TREE_TYPE (field) == error_mark_node
- || (COMPLETE_TYPE_P (TREE_TYPE (field))
- && integer_zerop (TYPE_SIZE (TREE_TYPE (field)))
- && (TREE_CODE (constructor_type) == ARRAY_TYPE
- || TREE_CHAIN (field)))))
- return;
+ if (! value)
+ /* If we are doing the bookkeeping for an element that was
+ directly output as a constructor, we must update
+ constructor_unfilled_index. */
+ constructor_unfilled_index = constructor_index;
+ }
+ else if (TREE_CODE (constructor_type) == VECTOR_TYPE)
+ {
+ tree elttype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type));
- value = digest_init (type, value, require_constant_value);
- if (value == error_mark_node)
- {
- constructor_erroneous = 1;
- return;
- }
+ /* Do a basic check of initializer size. Note that vectors
+ always have a fixed size derived from their type. */
+ if (tree_int_cst_lt (constructor_max_index, constructor_index))
+ {
+ pedwarn_init ("excess elements in vector initializer");
+ break;
+ }
- /* If this element doesn't come next in sequence,
- put it on constructor_pending_elts. */
- if (TREE_CODE (constructor_type) == ARRAY_TYPE
- && (!constructor_incremental
- || !tree_int_cst_equal (field, constructor_unfilled_index)))
- {
- if (constructor_incremental
- && tree_int_cst_lt (field, constructor_unfilled_index))
- set_nonincremental_init ();
+ /* Now output the actual element. */
+ if (value)
+ output_init_element (value, elttype, constructor_index, 1);
- add_pending_init (field, value);
- return;
- }
- else if (TREE_CODE (constructor_type) == RECORD_TYPE
- && (!constructor_incremental
- || field != constructor_unfilled_fields))
- {
- /* We do this for records but not for unions. In a union,
- no matter which field is specified, it can be initialized
- right away since it starts at the beginning of the union. */
- if (constructor_incremental)
+ constructor_index
+ = size_binop (PLUS_EXPR, constructor_index, bitsize_one_node);
+
+ if (! value)
+ /* If we are doing the bookkeeping for an element that was
+ directly output as a constructor, we must update
+ constructor_unfilled_index. */
+ constructor_unfilled_index = constructor_index;
+ }
+
+ /* Handle the sole element allowed in a braced initializer
+ for a scalar variable. */
+ else if (constructor_fields == 0)
{
- if (!constructor_unfilled_fields)
- set_nonincremental_init ();
- else
+ pedwarn_init ("excess elements in scalar initializer");
+ break;
+ }
+ else
+ {
+ if (value)
+ output_init_element (value, constructor_type, NULL_TREE, 1);
+ constructor_fields = 0;
+ }
+
+ /* Handle range initializers either at this level or anywhere higher
+ in the designator stack. */
+ if (constructor_range_stack)
+ {
+ struct constructor_range_stack *p, *range_stack;
+ int finish = 0;
+
+ range_stack = constructor_range_stack;
+ constructor_range_stack = 0;
+ while (constructor_stack != range_stack->stack)
{
- tree bitpos, unfillpos;
+ if (!constructor_stack->implicit)
+ abort ();
+ process_init_element (pop_init_level (1));
+ }
+ for (p = range_stack;
+ !p->range_end || tree_int_cst_equal (p->index, p->range_end);
+ p = p->prev)
+ {
+ if (!constructor_stack->implicit)
+ abort ();
+ process_init_element (pop_init_level (1));
+ }
- bitpos = bit_position (field);
- unfillpos = bit_position (constructor_unfilled_fields);
+ p->index = size_binop (PLUS_EXPR, p->index, bitsize_one_node);
+ if (tree_int_cst_equal (p->index, p->range_end) && !p->prev)
+ finish = 1;
- if (tree_int_cst_lt (bitpos, unfillpos))
- set_nonincremental_init ();
+ while (1)
+ {
+ constructor_index = p->index;
+ constructor_fields = p->fields;
+ if (finish && p->range_end && p->index == p->range_start)
+ {
+ finish = 0;
+ p->prev = 0;
+ }
+ p = p->next;
+ if (!p)
+ break;
+ push_init_level (2);
+ p->stack = constructor_stack;
+ if (p->range_end && tree_int_cst_equal (p->index, p->range_end))
+ p->index = p->range_start;
}
+
+ if (!finish)
+ constructor_range_stack = range_stack;
+ continue;
}
- add_pending_init (field, value);
- return;
+ break;
}
- else if (TREE_CODE (constructor_type) == UNION_TYPE
- && constructor_elements)
- {
- if (TREE_SIDE_EFFECTS (TREE_VALUE (constructor_elements)))
- warning_init ("initialized field with side-effects overwritten");
- /* We can have just one union field set. */
- constructor_elements = 0;
- }
+ constructor_range_stack = 0;
+}
+\f
+/* Build a complete asm-statement, whose components are a CV_QUALIFIER
+ (guaranteed to be 'volatile' or null) and ARGS (represented using
+ an ASM_STMT node). */
+tree
+build_asm_stmt (tree cv_qualifier, tree args)
+{
+ if (!ASM_VOLATILE_P (args) && cv_qualifier)
+ ASM_VOLATILE_P (args) = 1;
+ return add_stmt (args);
+}
- /* Otherwise, output this element either to
- constructor_elements or to the assembler file. */
+/* Build an asm-expr, whose components are a STRING, some OUTPUTS,
+ some INPUTS, and some CLOBBERS. The latter three may be NULL.
+ SIMPLE indicates whether there was anything at all after the
+ string in the asm expression -- asm("blah") and asm("blah" : )
+ are subtly different. We use a ASM_STMT node to represent this. */
+tree
+build_asm_expr (tree string, tree outputs, tree inputs, tree clobbers,
+ bool simple)
+{
+ tree tail;
+ tree args;
+ int i;
+ const char *constraint;
+ bool allows_mem, allows_reg, is_inout;
+ int ninputs;
+ int noutputs;
- if (field && TREE_CODE (field) == INTEGER_CST)
- field = copy_node (field);
- constructor_elements
- = tree_cons (field, value, constructor_elements);
+ ninputs = list_length (inputs);
+ noutputs = list_length (outputs);
- /* Advance the variable that indicates sequential elements output. */
- if (TREE_CODE (constructor_type) == ARRAY_TYPE)
- constructor_unfilled_index
- = size_binop (PLUS_EXPR, constructor_unfilled_index,
- bitsize_one_node);
- else if (TREE_CODE (constructor_type) == RECORD_TYPE)
+ /* Remove output conversions that change the type but not the mode. */
+ for (i = 0, tail = outputs; tail; ++i, tail = TREE_CHAIN (tail))
{
- constructor_unfilled_fields
- = TREE_CHAIN (constructor_unfilled_fields);
+ tree output = TREE_VALUE (tail);
+ STRIP_NOPS (output);
+ TREE_VALUE (tail) = output;
+ lvalue_or_else (output, "invalid lvalue in asm statement");
+
+ constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (tail)));
+
+ if (!parse_output_constraint (&constraint, i, ninputs, noutputs,
+ &allows_mem, &allows_reg, &is_inout))
+ {
+ /* By marking this operand as erroneous, we will not try
+ to process this operand again in expand_asm_operands. */
+ TREE_VALUE (tail) = error_mark_node;
+ continue;
+ }
+
+ /* If the operand is a DECL that is going to end up in
+ memory, assume it is addressable. This is a bit more
+ conservative than it would ideally be; the exact test is
+ buried deep in expand_asm_operands and depends on the
+ DECL_RTL for the OPERAND -- which we don't have at this
+ point. */
+ if (!allows_reg && DECL_P (output))
+ c_mark_addressable (output);
+ }
+
+ /* Perform default conversions on array and function inputs.
+ Don't do this for other types as it would screw up operands
+ expected to be in memory. */
+ for (tail = inputs; tail; tail = TREE_CHAIN (tail))
+ TREE_VALUE (tail) = default_function_array_conversion (TREE_VALUE (tail));
- /* Skip any nameless bit fields. */
- while (constructor_unfilled_fields != 0
- && DECL_C_BIT_FIELD (constructor_unfilled_fields)
- && DECL_NAME (constructor_unfilled_fields) == 0)
- constructor_unfilled_fields =
- TREE_CHAIN (constructor_unfilled_fields);
+ args = build_stmt (ASM_STMT, string, outputs, inputs, clobbers);
+
+ /* Simple asm statements are treated as volatile. */
+ if (simple)
+ {
+ ASM_VOLATILE_P (args) = 1;
+ ASM_INPUT_P (args) = 1;
}
- else if (TREE_CODE (constructor_type) == UNION_TYPE)
- constructor_unfilled_fields = 0;
+ return args;
+}
- /* Now output any pending elements which have become next. */
- if (pending)
- output_pending_init_elements (0);
-}
-
-/* Output any pending elements which have become next.
- As we output elements, constructor_unfilled_{fields,index}
- advances, which may cause other elements to become next;
- if so, they too are output.
-
- If ALL is 0, we return when there are
- no more pending elements to output now.
+/* Expand an ASM statement with operands, handling output operands
+ that are not variables or INDIRECT_REFS by transforming such
+ cases into cases that expand_asm_operands can handle.
- If ALL is 1, we output space as necessary so that
- we can output all the pending elements. */
+ Arguments are same as for expand_asm_operands. */
-static void
-output_pending_init_elements (all)
- int all;
+void
+c_expand_asm_operands (tree string, tree outputs, tree inputs,
+ tree clobbers, int vol, location_t locus)
{
- struct init_node *elt = constructor_pending_elts;
- tree next;
+ int noutputs = list_length (outputs);
+ int i;
+ /* o[I] is the place that output number I should be written. */
+ tree *o = alloca (noutputs * sizeof (tree));
+ tree tail;
- retry:
+ /* Record the contents of OUTPUTS before it is modified. */
+ for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++)
+ {
+ o[i] = TREE_VALUE (tail);
+ if (o[i] == error_mark_node)
+ return;
+ }
- /* Look thru the whole pending tree.
- If we find an element that should be output now,
- output it. Otherwise, set NEXT to the element
- that comes first among those still pending. */
-
- next = 0;
- while (elt)
+ /* Generate the ASM_OPERANDS insn; store into the TREE_VALUEs of
+ OUTPUTS some trees for where the values were actually stored. */
+ expand_asm_operands (string, outputs, inputs, clobbers, vol, locus);
+
+ /* Copy all the intermediate outputs into the specified outputs. */
+ for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++)
{
- if (TREE_CODE (constructor_type) == ARRAY_TYPE)
+ if (o[i] != TREE_VALUE (tail))
{
- if (tree_int_cst_equal (elt->purpose,
- constructor_unfilled_index))
- output_init_element (elt->value,
- TREE_TYPE (constructor_type),
- constructor_unfilled_index, 0);
- else if (tree_int_cst_lt (constructor_unfilled_index,
- elt->purpose))
- {
- /* Advance to the next smaller node. */
- if (elt->left)
- elt = elt->left;
- else
- {
- /* We have reached the smallest node bigger than the
- current unfilled index. Fill the space first. */
- next = elt->purpose;
- break;
- }
- }
- else
- {
- /* Advance to the next bigger node. */
- if (elt->right)
- elt = elt->right;
- else
- {
- /* We have reached the biggest node in a subtree. Find
- the parent of it, which is the next bigger node. */
- while (elt->parent && elt->parent->right == elt)
- elt = elt->parent;
- elt = elt->parent;
- if (elt && tree_int_cst_lt (constructor_unfilled_index,
- elt->purpose))
- {
- next = elt->purpose;
- break;
- }
- }
- }
+ expand_expr (build_modify_expr (o[i], NOP_EXPR, TREE_VALUE (tail)),
+ NULL_RTX, VOIDmode, EXPAND_NORMAL);
+ free_temp_slots ();
+
+ /* Restore the original value so that it's correct the next
+ time we expand this function. */
+ TREE_VALUE (tail) = o[i];
}
- else if (TREE_CODE (constructor_type) == RECORD_TYPE
- || TREE_CODE (constructor_type) == UNION_TYPE)
+ /* Detect modification of read-only values.
+ (Otherwise done by build_modify_expr.) */
+ else
{
- tree ctor_unfilled_bitpos, elt_bitpos;
-
- /* If the current record is complete we are done. */
- if (constructor_unfilled_fields == 0)
- break;
-
- ctor_unfilled_bitpos = bit_position (constructor_unfilled_fields);
- elt_bitpos = bit_position (elt->purpose);
- /* We can't compare fields here because there might be empty
- fields in between. */
- if (tree_int_cst_equal (elt_bitpos, ctor_unfilled_bitpos))
- {
- constructor_unfilled_fields = elt->purpose;
- output_init_element (elt->value, TREE_TYPE (elt->purpose),
- elt->purpose, 0);
- }
- else if (tree_int_cst_lt (ctor_unfilled_bitpos, elt_bitpos))
- {
- /* Advance to the next smaller node. */
- if (elt->left)
- elt = elt->left;
- else
- {
- /* We have reached the smallest node bigger than the
- current unfilled field. Fill the space first. */
- next = elt->purpose;
- break;
- }
- }
- else
- {
- /* Advance to the next bigger node. */
- if (elt->right)
- elt = elt->right;
- else
- {
- /* We have reached the biggest node in a subtree. Find
- the parent of it, which is the next bigger node. */
- while (elt->parent && elt->parent->right == elt)
- elt = elt->parent;
- elt = elt->parent;
- if (elt
- && (tree_int_cst_lt (ctor_unfilled_bitpos,
- bit_position (elt->purpose))))
- {
- next = elt->purpose;
- break;
- }
- }
- }
+ tree type = TREE_TYPE (o[i]);
+ if (TREE_READONLY (o[i])
+ || TYPE_READONLY (type)
+ || ((TREE_CODE (type) == RECORD_TYPE
+ || TREE_CODE (type) == UNION_TYPE)
+ && C_TYPE_FIELDS_READONLY (type)))
+ readonly_error (o[i], "modification by `asm'");
}
}
- /* Ordinarily return, but not if we want to output all
- and there are elements left. */
- if (! (all && next != 0))
- return;
-
- /* If it's not incremental, just skip over the gap, so that after
- jumping to retry we will output the next successive element. */
- if (TREE_CODE (constructor_type) == RECORD_TYPE
- || TREE_CODE (constructor_type) == UNION_TYPE)
- constructor_unfilled_fields = next;
- else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
- constructor_unfilled_index = next;
-
- /* ELT now points to the node in the pending tree with the next
- initializer to output. */
- goto retry;
+ /* Those MODIFY_EXPRs could do autoincrements. */
+ emit_queue ();
}
\f
-/* Add one non-braced element to the current constructor level.
- This adjusts the current position within the constructor's type.
- This may also start or terminate implicit levels
- to handle a partly-braced initializer.
-
- Once this has found the correct level for the new element,
- it calls output_init_element. */
+/* Expand a C `return' statement.
+ RETVAL is the expression for what to return,
+ or a null pointer for `return;' with no value. */
-void
-process_init_element (value)
- tree value;
+tree
+c_expand_return (tree retval)
{
- tree orig_value = value;
- int string_flag = value != 0 && TREE_CODE (value) == STRING_CST;
+ tree valtype = TREE_TYPE (TREE_TYPE (current_function_decl));
- designator_depth = 0;
- designator_errorneous = 0;
+ if (TREE_THIS_VOLATILE (current_function_decl))
+ warning ("function declared `noreturn' has a `return' statement");
- /* Handle superfluous braces around string cst as in
- char x[] = {"foo"}; */
- if (string_flag
- && constructor_type
- && TREE_CODE (constructor_type) == ARRAY_TYPE
- && TREE_CODE (TREE_TYPE (constructor_type)) == INTEGER_TYPE
- && integer_zerop (constructor_unfilled_index))
+ if (!retval)
{
- if (constructor_stack->replacement_value)
- error_init ("excess elements in char array initializer");
- constructor_stack->replacement_value = value;
- return;
+ current_function_returns_null = 1;
+ if ((warn_return_type || flag_isoc99)
+ && valtype != 0 && TREE_CODE (valtype) != VOID_TYPE)
+ pedwarn_c99 ("`return' with no value, in function returning non-void");
}
-
- if (constructor_stack->replacement_value != 0)
+ else if (valtype == 0 || TREE_CODE (valtype) == VOID_TYPE)
{
- error_init ("excess elements in struct initializer");
- return;
+ current_function_returns_null = 1;
+ if (pedantic || TREE_CODE (TREE_TYPE (retval)) != VOID_TYPE)
+ pedwarn ("`return' with a value, in function returning void");
}
-
- /* Ignore elements of a brace group if it is entirely superfluous
- and has already been diagnosed. */
- if (constructor_type == 0)
- return;
-
- /* If we've exhausted any levels that didn't have braces,
- pop them now. */
- while (constructor_stack->implicit)
+ else
{
- if ((TREE_CODE (constructor_type) == RECORD_TYPE
- || TREE_CODE (constructor_type) == UNION_TYPE)
- && constructor_fields == 0)
- process_init_element (pop_init_level (1));
- else if (TREE_CODE (constructor_type) == ARRAY_TYPE
- && (constructor_max_index == 0
- || tree_int_cst_lt (constructor_max_index,
- constructor_index)))
- process_init_element (pop_init_level (1));
- else
- break;
- }
+ tree t = convert_for_assignment (valtype, retval, _("return"),
+ NULL_TREE, NULL_TREE, 0);
+ tree res = DECL_RESULT (current_function_decl);
+ tree inner;
- /* In the case of [LO ... HI] = VALUE, only evaluate VALUE once. */
- if (constructor_range_stack)
- {
- /* If value is a compound literal and we'll be just using its
- content, don't put it into a SAVE_EXPR. */
- if (TREE_CODE (value) != COMPOUND_LITERAL_EXPR
- || !require_constant_value
- || flag_isoc99)
- value = save_expr (value);
- }
+ current_function_returns_value = 1;
+ if (t == error_mark_node)
+ return NULL_TREE;
- while (1)
- {
- if (TREE_CODE (constructor_type) == RECORD_TYPE)
- {
- tree fieldtype;
- enum tree_code fieldcode;
+ inner = t = convert (TREE_TYPE (res), t);
- if (constructor_fields == 0)
+ /* Strip any conversions, additions, and subtractions, and see if
+ we are returning the address of a local variable. Warn if so. */
+ while (1)
+ {
+ switch (TREE_CODE (inner))
{
- pedwarn_init ("excess elements in struct initializer");
- break;
- }
+ case NOP_EXPR: case NON_LVALUE_EXPR: case CONVERT_EXPR:
+ case PLUS_EXPR:
+ inner = TREE_OPERAND (inner, 0);
+ continue;
- fieldtype = TREE_TYPE (constructor_fields);
- if (fieldtype != error_mark_node)
- fieldtype = TYPE_MAIN_VARIANT (fieldtype);
- fieldcode = TREE_CODE (fieldtype);
+ case MINUS_EXPR:
+ /* If the second operand of the MINUS_EXPR has a pointer
+ type (or is converted from it), this may be valid, so
+ don't give a warning. */
+ {
+ tree op1 = TREE_OPERAND (inner, 1);
- /* Error for non-static initialization of a flexible array member. */
- if (fieldcode == ARRAY_TYPE
- && !require_constant_value
- && TYPE_SIZE (fieldtype) == NULL_TREE
- && TREE_CHAIN (constructor_fields) == NULL_TREE)
- {
- error_init ("non-static initialization of a flexible array member");
+ while (! POINTER_TYPE_P (TREE_TYPE (op1))
+ && (TREE_CODE (op1) == NOP_EXPR
+ || TREE_CODE (op1) == NON_LVALUE_EXPR
+ || TREE_CODE (op1) == CONVERT_EXPR))
+ op1 = TREE_OPERAND (op1, 0);
+
+ if (POINTER_TYPE_P (TREE_TYPE (op1)))
+ break;
+
+ inner = TREE_OPERAND (inner, 0);
+ continue;
+ }
+
+ case ADDR_EXPR:
+ inner = TREE_OPERAND (inner, 0);
+
+ while (TREE_CODE_CLASS (TREE_CODE (inner)) == 'r')
+ inner = TREE_OPERAND (inner, 0);
+
+ if (DECL_P (inner)
+ && ! DECL_EXTERNAL (inner)
+ && ! TREE_STATIC (inner)
+ && DECL_CONTEXT (inner) == current_function_decl)
+ warning ("function returns address of local variable");
break;
- }
- /* Accept a string constant to initialize a subarray. */
- if (value != 0
- && fieldcode == ARRAY_TYPE
- && TREE_CODE (TREE_TYPE (fieldtype)) == INTEGER_TYPE
- && string_flag)
- value = orig_value;
- /* Otherwise, if we have come to a subaggregate,
- and we don't have an element of its type, push into it. */
- else if (value != 0 && !constructor_no_implicit
- && value != error_mark_node
- && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != fieldtype
- && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE
- || fieldcode == UNION_TYPE))
- {
- push_init_level (1);
- continue;
+ default:
+ break;
}
- if (value)
- {
- push_member_name (constructor_fields);
- output_init_element (value, fieldtype, constructor_fields, 1);
- RESTORE_SPELLING_DEPTH (constructor_depth);
- }
- else
- /* Do the bookkeeping for an element that was
- directly output as a constructor. */
- {
- /* For a record, keep track of end position of last field. */
- if (DECL_SIZE (constructor_fields))
- constructor_bit_index
- = size_binop (PLUS_EXPR,
- bit_position (constructor_fields),
- DECL_SIZE (constructor_fields));
+ break;
+ }
- /* If the current field was the first one not yet written out,
- it isn't now, so update. */
- if (constructor_unfilled_fields == constructor_fields)
- {
- constructor_unfilled_fields = TREE_CHAIN (constructor_fields);
- /* Skip any nameless bit fields. */
- while (constructor_unfilled_fields != 0
- && DECL_C_BIT_FIELD (constructor_unfilled_fields)
- && DECL_NAME (constructor_unfilled_fields) == 0)
- constructor_unfilled_fields =
- TREE_CHAIN (constructor_unfilled_fields);
- }
- }
+ retval = build (MODIFY_EXPR, TREE_TYPE (res), res, t);
+ }
- constructor_fields = TREE_CHAIN (constructor_fields);
- /* Skip any nameless bit fields at the beginning. */
- while (constructor_fields != 0
- && DECL_C_BIT_FIELD (constructor_fields)
- && DECL_NAME (constructor_fields) == 0)
- constructor_fields = TREE_CHAIN (constructor_fields);
+ return add_stmt (build_return_stmt (retval));
+}
+\f
+struct c_switch {
+ /* The SWITCH_STMT being built. */
+ tree switch_stmt;
+ /* A splay-tree mapping the low element of a case range to the high
+ element, or NULL_TREE if there is no high element. Used to
+ determine whether or not a new case label duplicates an old case
+ label. We need a tree, rather than simply a hash table, because
+ of the GNU case range extension. */
+ splay_tree cases;
+ /* The next node on the stack. */
+ struct c_switch *next;
+};
+
+/* A stack of the currently active switch statements. The innermost
+ switch statement is on the top of the stack. There is no need to
+ mark the stack for garbage collection because it is only active
+ during the processing of the body of a function, and we never
+ collect at that point. */
+
+static struct c_switch *switch_stack;
+
+/* Start a C switch statement, testing expression EXP. Return the new
+ SWITCH_STMT. */
+
+tree
+c_start_case (tree exp)
+{
+ enum tree_code code;
+ tree type, orig_type = error_mark_node;
+ struct c_switch *cs;
+
+ if (exp != error_mark_node)
+ {
+ code = TREE_CODE (TREE_TYPE (exp));
+ orig_type = TREE_TYPE (exp);
+
+ if (! INTEGRAL_TYPE_P (orig_type)
+ && code != ERROR_MARK)
+ {
+ error ("switch quantity not an integer");
+ exp = integer_zero_node;
}
- else if (TREE_CODE (constructor_type) == UNION_TYPE)
+ else
{
- tree fieldtype;
- enum tree_code fieldcode;
+ type = TYPE_MAIN_VARIANT (TREE_TYPE (exp));
- if (constructor_fields == 0)
- {
- pedwarn_init ("excess elements in union initializer");
- break;
- }
+ if (warn_traditional && !in_system_header
+ && (type == long_integer_type_node
+ || type == long_unsigned_type_node))
+ warning ("`long' switch expression not converted to `int' in ISO C");
- fieldtype = TREE_TYPE (constructor_fields);
- if (fieldtype != error_mark_node)
- fieldtype = TYPE_MAIN_VARIANT (fieldtype);
- fieldcode = TREE_CODE (fieldtype);
+ exp = default_conversion (exp);
+ type = TREE_TYPE (exp);
+ }
+ }
- /* Warn that traditional C rejects initialization of unions.
- We skip the warning if the value is zero. This is done
- under the assumption that the zero initializer in user
- code appears conditioned on e.g. __STDC__ to avoid
- "missing initializer" warnings and relies on default
- initialization to zero in the traditional C case.
- We also skip the warning if the initializer is designated,
- again on the assumption that this must be conditional on
- __STDC__ anyway (and we've already complained about the
- member-designator already). */
- if (warn_traditional && !in_system_header && !constructor_designated
- && !(value && (integer_zerop (value) || real_zerop (value))))
- warning ("traditional C rejects initialization of unions");
+ /* Add this new SWITCH_STMT to the stack. */
+ cs = xmalloc (sizeof (*cs));
+ cs->switch_stmt = build_stmt (SWITCH_STMT, exp, NULL_TREE, orig_type);
+ cs->cases = splay_tree_new (case_compare, NULL, NULL);
+ cs->next = switch_stack;
+ switch_stack = cs;
- /* Accept a string constant to initialize a subarray. */
- if (value != 0
- && fieldcode == ARRAY_TYPE
- && TREE_CODE (TREE_TYPE (fieldtype)) == INTEGER_TYPE
- && string_flag)
- value = orig_value;
- /* Otherwise, if we have come to a subaggregate,
- and we don't have an element of its type, push into it. */
- else if (value != 0 && !constructor_no_implicit
- && value != error_mark_node
- && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != fieldtype
- && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE
- || fieldcode == UNION_TYPE))
- {
- push_init_level (1);
- continue;
- }
+ return add_stmt (switch_stack->switch_stmt);
+}
- if (value)
- {
- push_member_name (constructor_fields);
- output_init_element (value, fieldtype, constructor_fields, 1);
- RESTORE_SPELLING_DEPTH (constructor_depth);
- }
+/* Process a case label. */
+
+tree
+do_case (tree low_value, tree high_value)
+{
+ tree label = NULL_TREE;
+
+ if (switch_stack)
+ {
+ bool switch_was_empty_p = (SWITCH_BODY (switch_stack->switch_stmt) == NULL_TREE);
+
+ label = c_add_case_label (switch_stack->cases,
+ SWITCH_COND (switch_stack->switch_stmt),
+ low_value, high_value);
+ if (label == error_mark_node)
+ label = NULL_TREE;
+ else if (switch_was_empty_p)
+ {
+ /* Attach the first case label to the SWITCH_BODY. */
+ SWITCH_BODY (switch_stack->switch_stmt) = TREE_CHAIN (switch_stack->switch_stmt);
+ TREE_CHAIN (switch_stack->switch_stmt) = NULL_TREE;
+ }
+ }
+ else if (low_value)
+ error ("case label not within a switch statement");
+ else
+ error ("`default' label not within a switch statement");
+
+ return label;
+}
+
+/* Finish the switch statement. */
+
+void
+c_finish_case (void)
+{
+ struct c_switch *cs = switch_stack;
+
+ /* Emit warnings as needed. */
+ c_do_switch_warnings (cs->cases, cs->switch_stmt);
+
+ /* Rechain the next statements to the SWITCH_STMT. */
+ last_tree = cs->switch_stmt;
+
+ /* Pop the stack. */
+ switch_stack = switch_stack->next;
+ splay_tree_delete (cs->cases);
+ free (cs);
+}
+
+/* Build a binary-operation expression without default conversions.
+ CODE is the kind of expression to build.
+ This function differs from `build' in several ways:
+ the data type of the result is computed and recorded in it,
+ warnings are generated if arg data types are invalid,
+ special handling for addition and subtraction of pointers is known,
+ and some optimization is done (operations on narrow ints
+ are done in the narrower type when that gives the same result).
+ Constant folding is also done before the result is returned.
+
+ Note that the operands will never have enumeral types, or function
+ or array types, because either they will have the default conversions
+ performed or they have both just been converted to some other type in which
+ the arithmetic is to be done. */
+
+tree
+build_binary_op (enum tree_code code, tree orig_op0, tree orig_op1,
+ int convert_p)
+{
+ tree type0, type1;
+ enum tree_code code0, code1;
+ tree op0, op1;
+
+ /* Expression code to give to the expression when it is built.
+ Normally this is CODE, which is what the caller asked for,
+ but in some special cases we change it. */
+ enum tree_code resultcode = code;
+
+ /* Data type in which the computation is to be performed.
+ In the simplest cases this is the common type of the arguments. */
+ tree result_type = NULL;
+
+ /* Nonzero means operands have already been type-converted
+ in whatever way is necessary.
+ Zero means they need to be converted to RESULT_TYPE. */
+ int converted = 0;
+
+ /* Nonzero means create the expression with this type, rather than
+ RESULT_TYPE. */
+ tree build_type = 0;
+
+ /* Nonzero means after finally constructing the expression
+ convert it to this type. */
+ tree final_type = 0;
+
+ /* Nonzero if this is an operation like MIN or MAX which can
+ safely be computed in short if both args are promoted shorts.
+ Also implies COMMON.
+ -1 indicates a bitwise operation; this makes a difference
+ in the exact conditions for when it is safe to do the operation
+ in a narrower mode. */
+ int shorten = 0;
+
+ /* Nonzero if this is a comparison operation;
+ if both args are promoted shorts, compare the original shorts.
+ Also implies COMMON. */
+ int short_compare = 0;
+
+ /* Nonzero if this is a right-shift operation, which can be computed on the
+ original short and then promoted if the operand is a promoted short. */
+ int short_shift = 0;
+
+ /* Nonzero means set RESULT_TYPE to the common type of the args. */
+ int common = 0;
+
+ if (convert_p)
+ {
+ op0 = default_conversion (orig_op0);
+ op1 = default_conversion (orig_op1);
+ }
+ else
+ {
+ op0 = orig_op0;
+ op1 = orig_op1;
+ }
+
+ type0 = TREE_TYPE (op0);
+ type1 = TREE_TYPE (op1);
+
+ /* The expression codes of the data types of the arguments tell us
+ whether the arguments are integers, floating, pointers, etc. */
+ code0 = TREE_CODE (type0);
+ code1 = TREE_CODE (type1);
+
+ /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */
+ STRIP_TYPE_NOPS (op0);
+ STRIP_TYPE_NOPS (op1);
+
+ /* If an error was already reported for one of the arguments,
+ avoid reporting another error. */
+
+ if (code0 == ERROR_MARK || code1 == ERROR_MARK)
+ return error_mark_node;
+
+ switch (code)
+ {
+ case PLUS_EXPR:
+ /* Handle the pointer + int case. */
+ if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
+ return pointer_int_sum (PLUS_EXPR, op0, op1);
+ else if (code1 == POINTER_TYPE && code0 == INTEGER_TYPE)
+ return pointer_int_sum (PLUS_EXPR, op1, op0);
+ else
+ common = 1;
+ break;
+
+ case MINUS_EXPR:
+ /* Subtraction of two similar pointers.
+ We must subtract them as integers, then divide by object size. */
+ if (code0 == POINTER_TYPE && code1 == POINTER_TYPE
+ && comp_target_types (type0, type1, 1))
+ return pointer_diff (op0, op1);
+ /* Handle pointer minus int. Just like pointer plus int. */
+ else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
+ return pointer_int_sum (MINUS_EXPR, op0, op1);
+ else
+ common = 1;
+ break;
+
+ case MULT_EXPR:
+ common = 1;
+ break;
+
+ case TRUNC_DIV_EXPR:
+ case CEIL_DIV_EXPR:
+ case FLOOR_DIV_EXPR:
+ case ROUND_DIV_EXPR:
+ case EXACT_DIV_EXPR:
+ /* Floating point division by zero is a legitimate way to obtain
+ infinities and NaNs. */
+ if (warn_div_by_zero && skip_evaluation == 0 && integer_zerop (op1))
+ warning ("division by zero");
+
+ if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE
+ || code0 == COMPLEX_TYPE || code0 == VECTOR_TYPE)
+ && (code1 == INTEGER_TYPE || code1 == REAL_TYPE
+ || code1 == COMPLEX_TYPE || code1 == VECTOR_TYPE))
+ {
+ if (!(code0 == INTEGER_TYPE && code1 == INTEGER_TYPE))
+ resultcode = RDIV_EXPR;
else
- /* Do the bookkeeping for an element that was
- directly output as a constructor. */
+ /* Although it would be tempting to shorten always here, that
+ loses on some targets, since the modulo instruction is
+ undefined if the quotient can't be represented in the
+ computation mode. We shorten only if unsigned or if
+ dividing by something we know != -1. */
+ shorten = (TYPE_UNSIGNED (TREE_TYPE (orig_op0))
+ || (TREE_CODE (op1) == INTEGER_CST
+ && ! integer_all_onesp (op1)));
+ common = 1;
+ }
+ break;
+
+ case BIT_AND_EXPR:
+ case BIT_IOR_EXPR:
+ case BIT_XOR_EXPR:
+ if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
+ shorten = -1;
+ else if (code0 == VECTOR_TYPE && code1 == VECTOR_TYPE)
+ common = 1;
+ break;
+
+ case TRUNC_MOD_EXPR:
+ case FLOOR_MOD_EXPR:
+ if (warn_div_by_zero && skip_evaluation == 0 && integer_zerop (op1))
+ warning ("division by zero");
+
+ if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
+ {
+ /* Although it would be tempting to shorten always here, that loses
+ on some targets, since the modulo instruction is undefined if the
+ quotient can't be represented in the computation mode. We shorten
+ only if unsigned or if dividing by something we know != -1. */
+ shorten = (TYPE_UNSIGNED (TREE_TYPE (orig_op0))
+ || (TREE_CODE (op1) == INTEGER_CST
+ && ! integer_all_onesp (op1)));
+ common = 1;
+ }
+ break;
+
+ case TRUTH_ANDIF_EXPR:
+ case TRUTH_ORIF_EXPR:
+ case TRUTH_AND_EXPR:
+ case TRUTH_OR_EXPR:
+ case TRUTH_XOR_EXPR:
+ if ((code0 == INTEGER_TYPE || code0 == POINTER_TYPE
+ || code0 == REAL_TYPE || code0 == COMPLEX_TYPE)
+ && (code1 == INTEGER_TYPE || code1 == POINTER_TYPE
+ || code1 == REAL_TYPE || code1 == COMPLEX_TYPE))
+ {
+ /* Result of these operations is always an int,
+ but that does not mean the operands should be
+ converted to ints! */
+ result_type = integer_type_node;
+ op0 = lang_hooks.truthvalue_conversion (op0);
+ op1 = lang_hooks.truthvalue_conversion (op1);
+ converted = 1;
+ }
+ break;
+
+ /* Shift operations: result has same type as first operand;
+ always convert second operand to int.
+ Also set SHORT_SHIFT if shifting rightward. */
+
+ case RSHIFT_EXPR:
+ if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
+ {
+ if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0)
{
- constructor_bit_index = DECL_SIZE (constructor_fields);
- constructor_unfilled_fields = TREE_CHAIN (constructor_fields);
+ if (tree_int_cst_sgn (op1) < 0)
+ warning ("right shift count is negative");
+ else
+ {
+ if (! integer_zerop (op1))
+ short_shift = 1;
+
+ if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0)
+ warning ("right shift count >= width of type");
+ }
}
- constructor_fields = 0;
+ /* Use the type of the value to be shifted. */
+ result_type = type0;
+ /* Convert the shift-count to an integer, regardless of size
+ of value being shifted. */
+ if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
+ op1 = convert (integer_type_node, op1);
+ /* Avoid converting op1 to result_type later. */
+ converted = 1;
}
- else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
- {
- tree elttype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type));
- enum tree_code eltcode = TREE_CODE (elttype);
+ break;
- /* Accept a string constant to initialize a subarray. */
- if (value != 0
- && eltcode == ARRAY_TYPE
- && TREE_CODE (TREE_TYPE (elttype)) == INTEGER_TYPE
- && string_flag)
- value = orig_value;
- /* Otherwise, if we have come to a subaggregate,
- and we don't have an element of its type, push into it. */
- else if (value != 0 && !constructor_no_implicit
- && value != error_mark_node
- && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != elttype
- && (eltcode == RECORD_TYPE || eltcode == ARRAY_TYPE
- || eltcode == UNION_TYPE))
+ case LSHIFT_EXPR:
+ if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
+ {
+ if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0)
{
- push_init_level (1);
- continue;
- }
+ if (tree_int_cst_sgn (op1) < 0)
+ warning ("left shift count is negative");
- if (constructor_max_index != 0
- && (tree_int_cst_lt (constructor_max_index, constructor_index)
- || integer_all_onesp (constructor_max_index)))
- {
- pedwarn_init ("excess elements in array initializer");
- break;
+ else if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0)
+ warning ("left shift count >= width of type");
}
- /* Now output the actual element. */
- if (value)
+ /* Use the type of the value to be shifted. */
+ result_type = type0;
+ /* Convert the shift-count to an integer, regardless of size
+ of value being shifted. */
+ if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
+ op1 = convert (integer_type_node, op1);
+ /* Avoid converting op1 to result_type later. */
+ converted = 1;
+ }
+ break;
+
+ case RROTATE_EXPR:
+ case LROTATE_EXPR:
+ if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
+ {
+ if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0)
{
- push_array_bounds (tree_low_cst (constructor_index, 0));
- output_init_element (value, elttype, constructor_index, 1);
- RESTORE_SPELLING_DEPTH (constructor_depth);
+ if (tree_int_cst_sgn (op1) < 0)
+ warning ("shift count is negative");
+ else if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0)
+ warning ("shift count >= width of type");
}
- constructor_index
- = size_binop (PLUS_EXPR, constructor_index, bitsize_one_node);
-
- if (! value)
- /* If we are doing the bookkeeping for an element that was
- directly output as a constructor, we must update
- constructor_unfilled_index. */
- constructor_unfilled_index = constructor_index;
+ /* Use the type of the value to be shifted. */
+ result_type = type0;
+ /* Convert the shift-count to an integer, regardless of size
+ of value being shifted. */
+ if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
+ op1 = convert (integer_type_node, op1);
+ /* Avoid converting op1 to result_type later. */
+ converted = 1;
}
- else if (TREE_CODE (constructor_type) == VECTOR_TYPE)
- {
- tree elttype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type));
+ break;
- /* Do a basic check of initializer size. Note that vectors
- always have a fixed size derived from their type. */
- if (tree_int_cst_lt (constructor_max_index, constructor_index))
+ case EQ_EXPR:
+ case NE_EXPR:
+ if (warn_float_equal && (code0 == REAL_TYPE || code1 == REAL_TYPE))
+ warning ("comparing floating point with == or != is unsafe");
+ /* Result of comparison is always int,
+ but don't convert the args to int! */
+ build_type = integer_type_node;
+ if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE
+ || code0 == COMPLEX_TYPE)
+ && (code1 == INTEGER_TYPE || code1 == REAL_TYPE
+ || code1 == COMPLEX_TYPE))
+ short_compare = 1;
+ else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE)
+ {
+ tree tt0 = TREE_TYPE (type0);
+ tree tt1 = TREE_TYPE (type1);
+ /* Anything compares with void *. void * compares with anything.
+ Otherwise, the targets must be compatible
+ and both must be object or both incomplete. */
+ if (comp_target_types (type0, type1, 1))
+ result_type = common_pointer_type (type0, type1);
+ else if (VOID_TYPE_P (tt0))
{
- pedwarn_init ("excess elements in vector initializer");
- break;
+ /* op0 != orig_op0 detects the case of something
+ whose value is 0 but which isn't a valid null ptr const. */
+ if (pedantic && (!integer_zerop (op0) || op0 != orig_op0)
+ && TREE_CODE (tt1) == FUNCTION_TYPE)
+ pedwarn ("ISO C forbids comparison of `void *' with function pointer");
}
+ else if (VOID_TYPE_P (tt1))
+ {
+ if (pedantic && (!integer_zerop (op1) || op1 != orig_op1)
+ && TREE_CODE (tt0) == FUNCTION_TYPE)
+ pedwarn ("ISO C forbids comparison of `void *' with function pointer");
+ }
+ else
+ pedwarn ("comparison of distinct pointer types lacks a cast");
- /* Now output the actual element. */
- if (value)
- output_init_element (value, elttype, constructor_index, 1);
-
- constructor_index
- = size_binop (PLUS_EXPR, constructor_index, bitsize_one_node);
-
- if (! value)
- /* If we are doing the bookkeeping for an element that was
- directly output as a constructor, we must update
- constructor_unfilled_index. */
- constructor_unfilled_index = constructor_index;
+ if (result_type == NULL_TREE)
+ result_type = ptr_type_node;
}
-
- /* Handle the sole element allowed in a braced initializer
- for a scalar variable. */
- else if (constructor_fields == 0)
+ else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST
+ && integer_zerop (op1))
+ result_type = type0;
+ else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST
+ && integer_zerop (op0))
+ result_type = type1;
+ else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
{
- pedwarn_init ("excess elements in scalar initializer");
- break;
+ result_type = type0;
+ pedwarn ("comparison between pointer and integer");
}
- else
+ else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE)
{
- if (value)
- output_init_element (value, constructor_type, NULL_TREE, 1);
- constructor_fields = 0;
+ result_type = type1;
+ pedwarn ("comparison between pointer and integer");
}
+ break;
- /* Handle range initializers either at this level or anywhere higher
- in the designator stack. */
- if (constructor_range_stack)
+ case MAX_EXPR:
+ case MIN_EXPR:
+ if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE)
+ && (code1 == INTEGER_TYPE || code1 == REAL_TYPE))
+ shorten = 1;
+ else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE)
{
- struct constructor_range_stack *p, *range_stack;
- int finish = 0;
-
- range_stack = constructor_range_stack;
- constructor_range_stack = 0;
- while (constructor_stack != range_stack->stack)
+ if (comp_target_types (type0, type1, 1))
{
- if (!constructor_stack->implicit)
- abort ();
- process_init_element (pop_init_level (1));
+ result_type = common_pointer_type (type0, type1);
+ if (pedantic
+ && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE)
+ pedwarn ("ISO C forbids ordered comparisons of pointers to functions");
}
- for (p = range_stack;
- !p->range_end || tree_int_cst_equal (p->index, p->range_end);
- p = p->prev)
+ else
{
- if (!constructor_stack->implicit)
- abort ();
- process_init_element (pop_init_level (1));
+ result_type = ptr_type_node;
+ pedwarn ("comparison of distinct pointer types lacks a cast");
}
+ }
+ break;
- p->index = size_binop (PLUS_EXPR, p->index, bitsize_one_node);
- if (tree_int_cst_equal (p->index, p->range_end) && !p->prev)
- finish = 1;
-
- while (1)
+ case LE_EXPR:
+ case GE_EXPR:
+ case LT_EXPR:
+ case GT_EXPR:
+ build_type = integer_type_node;
+ if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE)
+ && (code1 == INTEGER_TYPE || code1 == REAL_TYPE))
+ short_compare = 1;
+ else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE)
+ {
+ if (comp_target_types (type0, type1, 1))
{
- constructor_index = p->index;
- constructor_fields = p->fields;
- if (finish && p->range_end && p->index == p->range_start)
- {
- finish = 0;
- p->prev = 0;
- }
- p = p->next;
- if (!p)
- break;
- push_init_level (2);
- p->stack = constructor_stack;
- if (p->range_end && tree_int_cst_equal (p->index, p->range_end))
- p->index = p->range_start;
+ result_type = common_pointer_type (type0, type1);
+ if (!COMPLETE_TYPE_P (TREE_TYPE (type0))
+ != !COMPLETE_TYPE_P (TREE_TYPE (type1)))
+ pedwarn ("comparison of complete and incomplete pointers");
+ else if (pedantic
+ && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE)
+ pedwarn ("ISO C forbids ordered comparisons of pointers to functions");
+ }
+ else
+ {
+ result_type = ptr_type_node;
+ pedwarn ("comparison of distinct pointer types lacks a cast");
}
-
- if (!finish)
- constructor_range_stack = range_stack;
- continue;
}
-
+ else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST
+ && integer_zerop (op1))
+ {
+ result_type = type0;
+ if (pedantic || extra_warnings)
+ pedwarn ("ordered comparison of pointer with integer zero");
+ }
+ else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST
+ && integer_zerop (op0))
+ {
+ result_type = type1;
+ if (pedantic)
+ pedwarn ("ordered comparison of pointer with integer zero");
+ }
+ else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
+ {
+ result_type = type0;
+ pedwarn ("comparison between pointer and integer");
+ }
+ else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE)
+ {
+ result_type = type1;
+ pedwarn ("comparison between pointer and integer");
+ }
break;
- }
-
- constructor_range_stack = 0;
-}
-\f
-/* Build a simple asm-statement, from one string literal. */
-tree
-simple_asm_stmt (expr)
- tree expr;
-{
- STRIP_NOPS (expr);
- if (TREE_CODE (expr) == ADDR_EXPR)
- expr = TREE_OPERAND (expr, 0);
-
- if (TREE_CODE (expr) == STRING_CST)
- {
- tree stmt;
+ case UNORDERED_EXPR:
+ case ORDERED_EXPR:
+ case UNLT_EXPR:
+ case UNLE_EXPR:
+ case UNGT_EXPR:
+ case UNGE_EXPR:
+ case UNEQ_EXPR:
+ case LTGT_EXPR:
+ build_type = integer_type_node;
+ if (code0 != REAL_TYPE || code1 != REAL_TYPE)
+ {
+ error ("unordered comparison on non-floating point argument");
+ return error_mark_node;
+ }
+ common = 1;
+ break;
- /* Simple asm statements are treated as volatile. */
- stmt = add_stmt (build_stmt (ASM_STMT, ridpointers[(int) RID_VOLATILE],
- expr, NULL_TREE, NULL_TREE, NULL_TREE));
- ASM_INPUT_P (stmt) = 1;
- return stmt;
+ default:
+ break;
}
- error ("argument of `asm' is not a constant string");
- return NULL_TREE;
-}
-
-/* Build an asm-statement, whose components are a CV_QUALIFIER, a
- STRING, some OUTPUTS, some INPUTS, and some CLOBBERS. */
-
-tree
-build_asm_stmt (cv_qualifier, string, outputs, inputs, clobbers)
- tree cv_qualifier;
- tree string;
- tree outputs;
- tree inputs;
- tree clobbers;
-{
- tree tail;
-
- if (TREE_CODE (string) != STRING_CST)
- {
- error ("asm template is not a string constant");
- return NULL_TREE;
- }
+ if (code0 == ERROR_MARK || code1 == ERROR_MARK)
+ return error_mark_node;
- if (cv_qualifier != NULL_TREE
- && cv_qualifier != ridpointers[(int) RID_VOLATILE])
+ if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE || code0 == COMPLEX_TYPE
+ || code0 == VECTOR_TYPE)
+ &&
+ (code1 == INTEGER_TYPE || code1 == REAL_TYPE || code1 == COMPLEX_TYPE
+ || code1 == VECTOR_TYPE))
{
- warning ("%s qualifier ignored on asm",
- IDENTIFIER_POINTER (cv_qualifier));
- cv_qualifier = NULL_TREE;
- }
+ int none_complex = (code0 != COMPLEX_TYPE && code1 != COMPLEX_TYPE);
- /* We can remove output conversions that change the type,
- but not the mode. */
- for (tail = outputs; tail; tail = TREE_CHAIN (tail))
- {
- tree output = TREE_VALUE (tail);
+ if (shorten || common || short_compare)
+ result_type = common_type (type0, type1);
- STRIP_NOPS (output);
- TREE_VALUE (tail) = output;
+ /* For certain operations (which identify themselves by shorten != 0)
+ if both args were extended from the same smaller type,
+ do the arithmetic in that type and then extend.
- /* Allow conversions as LHS here. build_modify_expr as called below
- will do the right thing with them. */
- while (TREE_CODE (output) == NOP_EXPR
- || TREE_CODE (output) == CONVERT_EXPR
- || TREE_CODE (output) == FLOAT_EXPR
- || TREE_CODE (output) == FIX_TRUNC_EXPR
- || TREE_CODE (output) == FIX_FLOOR_EXPR
- || TREE_CODE (output) == FIX_ROUND_EXPR
- || TREE_CODE (output) == FIX_CEIL_EXPR)
- output = TREE_OPERAND (output, 0);
+ shorten !=0 and !=1 indicates a bitwise operation.
+ For them, this optimization is safe only if
+ both args are zero-extended or both are sign-extended.
+ Otherwise, we might change the result.
+ Eg, (short)-1 | (unsigned short)-1 is (int)-1
+ but calculated in (unsigned short) it would be (unsigned short)-1. */
- lvalue_or_else (TREE_VALUE (tail), "invalid lvalue in asm statement");
- }
+ if (shorten && none_complex)
+ {
+ int unsigned0, unsigned1;
+ tree arg0 = get_narrower (op0, &unsigned0);
+ tree arg1 = get_narrower (op1, &unsigned1);
+ /* UNS is 1 if the operation to be done is an unsigned one. */
+ int uns = TYPE_UNSIGNED (result_type);
+ tree type;
- /* Remove output conversions that change the type but not the mode. */
- for (tail = outputs; tail; tail = TREE_CHAIN (tail))
- {
- tree output = TREE_VALUE (tail);
- STRIP_NOPS (output);
- TREE_VALUE (tail) = output;
- }
+ final_type = result_type;
- /* Perform default conversions on array and function inputs.
- Don't do this for other types as it would screw up operands
- expected to be in memory. */
- for (tail = inputs; tail; tail = TREE_CHAIN (tail))
- TREE_VALUE (tail) = default_function_array_conversion (TREE_VALUE (tail));
+ /* Handle the case that OP0 (or OP1) does not *contain* a conversion
+ but it *requires* conversion to FINAL_TYPE. */
- return add_stmt (build_stmt (ASM_STMT, cv_qualifier, string,
- outputs, inputs, clobbers));
-}
+ if ((TYPE_PRECISION (TREE_TYPE (op0))
+ == TYPE_PRECISION (TREE_TYPE (arg0)))
+ && TREE_TYPE (op0) != final_type)
+ unsigned0 = TYPE_UNSIGNED (TREE_TYPE (op0));
+ if ((TYPE_PRECISION (TREE_TYPE (op1))
+ == TYPE_PRECISION (TREE_TYPE (arg1)))
+ && TREE_TYPE (op1) != final_type)
+ unsigned1 = TYPE_UNSIGNED (TREE_TYPE (op1));
-/* Expand an ASM statement with operands, handling output operands
- that are not variables or INDIRECT_REFS by transforming such
- cases into cases that expand_asm_operands can handle.
+ /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */
- Arguments are same as for expand_asm_operands. */
+ /* For bitwise operations, signedness of nominal type
+ does not matter. Consider only how operands were extended. */
+ if (shorten == -1)
+ uns = unsigned0;
-void
-c_expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line)
- tree string, outputs, inputs, clobbers;
- int vol;
- const char *filename;
- int line;
-{
- int noutputs = list_length (outputs);
- int i;
- /* o[I] is the place that output number I should be written. */
- tree *o = (tree *) alloca (noutputs * sizeof (tree));
- tree tail;
+ /* Note that in all three cases below we refrain from optimizing
+ an unsigned operation on sign-extended args.
+ That would not be valid. */
- /* Record the contents of OUTPUTS before it is modified. */
- for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++)
- {
- o[i] = TREE_VALUE (tail);
- if (o[i] == error_mark_node)
- return;
- }
+ /* Both args variable: if both extended in same way
+ from same width, do it in that width.
+ Do it unsigned if args were zero-extended. */
+ if ((TYPE_PRECISION (TREE_TYPE (arg0))
+ < TYPE_PRECISION (result_type))
+ && (TYPE_PRECISION (TREE_TYPE (arg1))
+ == TYPE_PRECISION (TREE_TYPE (arg0)))
+ && unsigned0 == unsigned1
+ && (unsigned0 || !uns))
+ result_type
+ = c_common_signed_or_unsigned_type
+ (unsigned0, common_type (TREE_TYPE (arg0), TREE_TYPE (arg1)));
+ else if (TREE_CODE (arg0) == INTEGER_CST
+ && (unsigned1 || !uns)
+ && (TYPE_PRECISION (TREE_TYPE (arg1))
+ < TYPE_PRECISION (result_type))
+ && (type
+ = c_common_signed_or_unsigned_type (unsigned1,
+ TREE_TYPE (arg1)),
+ int_fits_type_p (arg0, type)))
+ result_type = type;
+ else if (TREE_CODE (arg1) == INTEGER_CST
+ && (unsigned0 || !uns)
+ && (TYPE_PRECISION (TREE_TYPE (arg0))
+ < TYPE_PRECISION (result_type))
+ && (type
+ = c_common_signed_or_unsigned_type (unsigned0,
+ TREE_TYPE (arg0)),
+ int_fits_type_p (arg1, type)))
+ result_type = type;
+ }
- /* Generate the ASM_OPERANDS insn; store into the TREE_VALUEs of
- OUTPUTS some trees for where the values were actually stored. */
- expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line);
+ /* Shifts can be shortened if shifting right. */
- /* Copy all the intermediate outputs into the specified outputs. */
- for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++)
- {
- if (o[i] != TREE_VALUE (tail))
+ if (short_shift)
{
- expand_expr (build_modify_expr (o[i], NOP_EXPR, TREE_VALUE (tail)),
- NULL_RTX, VOIDmode, EXPAND_NORMAL);
- free_temp_slots ();
+ int unsigned_arg;
+ tree arg0 = get_narrower (op0, &unsigned_arg);
- /* Restore the original value so that it's correct the next
- time we expand this function. */
- TREE_VALUE (tail) = o[i];
- }
- /* Detect modification of read-only values.
- (Otherwise done by build_modify_expr.) */
- else
- {
- tree type = TREE_TYPE (o[i]);
- if (TREE_READONLY (o[i])
- || TYPE_READONLY (type)
- || ((TREE_CODE (type) == RECORD_TYPE
- || TREE_CODE (type) == UNION_TYPE)
- && C_TYPE_FIELDS_READONLY (type)))
- readonly_warning (o[i], "modification by `asm'");
- }
- }
+ final_type = result_type;
- /* Those MODIFY_EXPRs could do autoincrements. */
- emit_queue ();
-}
-\f
-/* Expand a C `return' statement.
- RETVAL is the expression for what to return,
- or a null pointer for `return;' with no value. */
+ if (arg0 == op0 && final_type == TREE_TYPE (op0))
+ unsigned_arg = TYPE_UNSIGNED (TREE_TYPE (op0));
-tree
-c_expand_return (retval)
- tree retval;
-{
- tree valtype = TREE_TYPE (TREE_TYPE (current_function_decl));
+ if (TYPE_PRECISION (TREE_TYPE (arg0)) < TYPE_PRECISION (result_type)
+ /* We can shorten only if the shift count is less than the
+ number of bits in the smaller type size. */
+ && compare_tree_int (op1, TYPE_PRECISION (TREE_TYPE (arg0))) < 0
+ /* We cannot drop an unsigned shift after sign-extension. */
+ && (!TYPE_UNSIGNED (final_type) || unsigned_arg))
+ {
+ /* Do an unsigned shift if the operand was zero-extended. */
+ result_type
+ = c_common_signed_or_unsigned_type (unsigned_arg,
+ TREE_TYPE (arg0));
+ /* Convert value-to-be-shifted to that type. */
+ if (TREE_TYPE (op0) != result_type)
+ op0 = convert (result_type, op0);
+ converted = 1;
+ }
+ }
- if (TREE_THIS_VOLATILE (current_function_decl))
- warning ("function declared `noreturn' has a `return' statement");
+ /* Comparison operations are shortened too but differently.
+ They identify themselves by setting short_compare = 1. */
- if (!retval)
- {
- current_function_returns_null = 1;
- if ((warn_return_type || flag_isoc99)
- && valtype != 0 && TREE_CODE (valtype) != VOID_TYPE)
- pedwarn_c99 ("`return' with no value, in function returning non-void");
- }
- else if (valtype == 0 || TREE_CODE (valtype) == VOID_TYPE)
- {
- current_function_returns_null = 1;
- if (pedantic || TREE_CODE (TREE_TYPE (retval)) != VOID_TYPE)
- pedwarn ("`return' with a value, in function returning void");
- }
- else
- {
- tree t = convert_for_assignment (valtype, retval, _("return"),
- NULL_TREE, NULL_TREE, 0);
- tree res = DECL_RESULT (current_function_decl);
- tree inner;
+ if (short_compare)
+ {
+ /* Don't write &op0, etc., because that would prevent op0
+ from being kept in a register.
+ Instead, make copies of the our local variables and
+ pass the copies by reference, then copy them back afterward. */
+ tree xop0 = op0, xop1 = op1, xresult_type = result_type;
+ enum tree_code xresultcode = resultcode;
+ tree val
+ = shorten_compare (&xop0, &xop1, &xresult_type, &xresultcode);
- current_function_returns_value = 1;
- if (t == error_mark_node)
- return NULL_TREE;
+ if (val != 0)
+ return val;
- inner = t = convert (TREE_TYPE (res), t);
+ op0 = xop0, op1 = xop1;
+ converted = 1;
+ resultcode = xresultcode;
- /* Strip any conversions, additions, and subtractions, and see if
- we are returning the address of a local variable. Warn if so. */
- while (1)
- {
- switch (TREE_CODE (inner))
+ if (warn_sign_compare && skip_evaluation == 0)
{
- case NOP_EXPR: case NON_LVALUE_EXPR: case CONVERT_EXPR:
- case PLUS_EXPR:
- inner = TREE_OPERAND (inner, 0);
- continue;
-
- case MINUS_EXPR:
- /* If the second operand of the MINUS_EXPR has a pointer
- type (or is converted from it), this may be valid, so
- don't give a warning. */
- {
- tree op1 = TREE_OPERAND (inner, 1);
+ int op0_signed = ! TYPE_UNSIGNED (TREE_TYPE (orig_op0));
+ int op1_signed = ! TYPE_UNSIGNED (TREE_TYPE (orig_op1));
+ int unsignedp0, unsignedp1;
+ tree primop0 = get_narrower (op0, &unsignedp0);
+ tree primop1 = get_narrower (op1, &unsignedp1);
- while (! POINTER_TYPE_P (TREE_TYPE (op1))
- && (TREE_CODE (op1) == NOP_EXPR
- || TREE_CODE (op1) == NON_LVALUE_EXPR
- || TREE_CODE (op1) == CONVERT_EXPR))
- op1 = TREE_OPERAND (op1, 0);
+ xop0 = orig_op0;
+ xop1 = orig_op1;
+ STRIP_TYPE_NOPS (xop0);
+ STRIP_TYPE_NOPS (xop1);
- if (POINTER_TYPE_P (TREE_TYPE (op1)))
- break;
+ /* Give warnings for comparisons between signed and unsigned
+ quantities that may fail.
- inner = TREE_OPERAND (inner, 0);
- continue;
- }
-
- case ADDR_EXPR:
- inner = TREE_OPERAND (inner, 0);
+ Do the checking based on the original operand trees, so that
+ casts will be considered, but default promotions won't be.
- while (TREE_CODE_CLASS (TREE_CODE (inner)) == 'r')
- inner = TREE_OPERAND (inner, 0);
+ Do not warn if the comparison is being done in a signed type,
+ since the signed type will only be chosen if it can represent
+ all the values of the unsigned type. */
+ if (! TYPE_UNSIGNED (result_type))
+ /* OK */;
+ /* Do not warn if both operands are the same signedness. */
+ else if (op0_signed == op1_signed)
+ /* OK */;
+ else
+ {
+ tree sop, uop;
- if (TREE_CODE (inner) == VAR_DECL
- && ! DECL_EXTERNAL (inner)
- && ! TREE_STATIC (inner)
- && DECL_CONTEXT (inner) == current_function_decl)
- warning ("function returns address of local variable");
- break;
+ if (op0_signed)
+ sop = xop0, uop = xop1;
+ else
+ sop = xop1, uop = xop0;
- default:
- break;
- }
+ /* Do not warn if the signed quantity is an
+ unsuffixed integer literal (or some static
+ constant expression involving such literals or a
+ conditional expression involving such literals)
+ and it is non-negative. */
+ if (c_tree_expr_nonnegative_p (sop))
+ /* OK */;
+ /* Do not warn if the comparison is an equality operation,
+ the unsigned quantity is an integral constant, and it
+ would fit in the result if the result were signed. */
+ else if (TREE_CODE (uop) == INTEGER_CST
+ && (resultcode == EQ_EXPR || resultcode == NE_EXPR)
+ && int_fits_type_p
+ (uop, c_common_signed_type (result_type)))
+ /* OK */;
+ /* Do not warn if the unsigned quantity is an enumeration
+ constant and its maximum value would fit in the result
+ if the result were signed. */
+ else if (TREE_CODE (uop) == INTEGER_CST
+ && TREE_CODE (TREE_TYPE (uop)) == ENUMERAL_TYPE
+ && int_fits_type_p
+ (TYPE_MAX_VALUE (TREE_TYPE(uop)),
+ c_common_signed_type (result_type)))
+ /* OK */;
+ else
+ warning ("comparison between signed and unsigned");
+ }
- break;
- }
+ /* Warn if two unsigned values are being compared in a size
+ larger than their original size, and one (and only one) is the
+ result of a `~' operator. This comparison will always fail.
- retval = build (MODIFY_EXPR, TREE_TYPE (res), res, t);
- }
+ Also warn if one operand is a constant, and the constant
+ does not have all bits set that are set in the ~ operand
+ when it is extended. */
- return add_stmt (build_return_stmt (retval));
-}
-\f
-struct c_switch {
- /* The SWITCH_STMT being built. */
- tree switch_stmt;
- /* A splay-tree mapping the low element of a case range to the high
- element, or NULL_TREE if there is no high element. Used to
- determine whether or not a new case label duplicates an old case
- label. We need a tree, rather than simply a hash table, because
- of the GNU case range extension. */
- splay_tree cases;
- /* The next node on the stack. */
- struct c_switch *next;
-};
+ if ((TREE_CODE (primop0) == BIT_NOT_EXPR)
+ != (TREE_CODE (primop1) == BIT_NOT_EXPR))
+ {
+ if (TREE_CODE (primop0) == BIT_NOT_EXPR)
+ primop0 = get_narrower (TREE_OPERAND (primop0, 0),
+ &unsignedp0);
+ else
+ primop1 = get_narrower (TREE_OPERAND (primop1, 0),
+ &unsignedp1);
-/* A stack of the currently active switch statements. The innermost
- switch statement is on the top of the stack. There is no need to
- mark the stack for garbage collection because it is only active
- during the processing of the body of a function, and we never
- collect at that point. */
+ if (host_integerp (primop0, 0) || host_integerp (primop1, 0))
+ {
+ tree primop;
+ HOST_WIDE_INT constant, mask;
+ int unsignedp, bits;
-static struct c_switch *switch_stack;
+ if (host_integerp (primop0, 0))
+ {
+ primop = primop1;
+ unsignedp = unsignedp1;
+ constant = tree_low_cst (primop0, 0);
+ }
+ else
+ {
+ primop = primop0;
+ unsignedp = unsignedp0;
+ constant = tree_low_cst (primop1, 0);
+ }
-/* Start a C switch statement, testing expression EXP. Return the new
- SWITCH_STMT. */
+ bits = TYPE_PRECISION (TREE_TYPE (primop));
+ if (bits < TYPE_PRECISION (result_type)
+ && bits < HOST_BITS_PER_WIDE_INT && unsignedp)
+ {
+ mask = (~ (HOST_WIDE_INT) 0) << bits;
+ if ((mask & constant) != mask)
+ warning ("comparison of promoted ~unsigned with constant");
+ }
+ }
+ else if (unsignedp0 && unsignedp1
+ && (TYPE_PRECISION (TREE_TYPE (primop0))
+ < TYPE_PRECISION (result_type))
+ && (TYPE_PRECISION (TREE_TYPE (primop1))
+ < TYPE_PRECISION (result_type)))
+ warning ("comparison of promoted ~unsigned with unsigned");
+ }
+ }
+ }
+ }
-tree
-c_start_case (exp)
- tree exp;
-{
- enum tree_code code;
- tree type, orig_type = error_mark_node;
- struct c_switch *cs;
+ /* At this point, RESULT_TYPE must be nonzero to avoid an error message.
+ If CONVERTED is zero, both args will be converted to type RESULT_TYPE.
+ Then the expression will be built.
+ It will be given type FINAL_TYPE if that is nonzero;
+ otherwise, it will be given type RESULT_TYPE. */
- if (exp != error_mark_node)
+ if (!result_type)
{
- code = TREE_CODE (TREE_TYPE (exp));
- orig_type = TREE_TYPE (exp);
+ binary_op_error (code);
+ return error_mark_node;
+ }
- if (! INTEGRAL_TYPE_P (orig_type)
- && code != ERROR_MARK)
- {
- error ("switch quantity not an integer");
- exp = integer_zero_node;
- }
- else
- {
- type = TYPE_MAIN_VARIANT (TREE_TYPE (exp));
+ if (! converted)
+ {
+ if (TREE_TYPE (op0) != result_type)
+ op0 = convert (result_type, op0);
+ if (TREE_TYPE (op1) != result_type)
+ op1 = convert (result_type, op1);
+ }
- if (warn_traditional && !in_system_header
- && (type == long_integer_type_node
- || type == long_unsigned_type_node))
- warning ("`long' switch expression not converted to `int' in ISO C");
+ if (build_type == NULL_TREE)
+ build_type = result_type;
- exp = default_conversion (exp);
- type = TREE_TYPE (exp);
- }
- }
+ {
+ tree result = build (resultcode, build_type, op0, op1);
- /* Add this new SWITCH_STMT to the stack. */
- cs = (struct c_switch *) xmalloc (sizeof (*cs));
- cs->switch_stmt = build_stmt (SWITCH_STMT, exp, NULL_TREE, orig_type);
- cs->cases = splay_tree_new (case_compare, NULL, NULL);
- cs->next = switch_stack;
- switch_stack = cs;
+ /* Treat expressions in initializers specially as they can't trap. */
+ result = require_constant_value ? fold_initializer (result)
+ : fold (result);
- return add_stmt (switch_stack->switch_stmt);
+ if (final_type != 0)
+ result = convert (final_type, result);
+ return result;
+ }
}
-/* Process a case label. */
+/* Build the result of __builtin_offsetof. TYPE is the first argument to
+ offsetof, i.e. a type. LIST is a tree_list that encodes component and
+ array references; PURPOSE is set for the former and VALUE is set for
+ the later. */
tree
-do_case (low_value, high_value)
- tree low_value;
- tree high_value;
+build_offsetof (tree type, tree list)
{
- tree label = NULL_TREE;
-
- if (switch_stack)
- {
- label = c_add_case_label (switch_stack->cases,
- SWITCH_COND (switch_stack->switch_stmt),
- low_value, high_value);
- if (label == error_mark_node)
- label = NULL_TREE;
- }
- else if (low_value)
- error ("case label not within a switch statement");
- else
- error ("`default' label not within a switch statement");
-
- return label;
-}
-
-/* Finish the switch statement. */
+ tree t;
-void
-c_finish_case ()
-{
- struct c_switch *cs = switch_stack;
+ /* Build "*(type *)0". */
+ t = convert (build_pointer_type (type), null_pointer_node);
+ t = build_indirect_ref (t, "");
- RECHAIN_STMTS (cs->switch_stmt, SWITCH_BODY (cs->switch_stmt));
+ /* Build COMPONENT and ARRAY_REF expressions as needed. */
+ for (list = nreverse (list); list ; list = TREE_CHAIN (list))
+ if (TREE_PURPOSE (list))
+ t = build_component_ref (t, TREE_PURPOSE (list));
+ else
+ t = build_array_ref (t, TREE_VALUE (list));
- /* Pop the stack. */
- switch_stack = switch_stack->next;
- splay_tree_delete (cs->cases);
- free (cs);
+ /* Finalize the offsetof expression. For now all we need to do is take
+ the address of the expression we created, and cast that to an integer
+ type; this mirrors the traditional macro implementation of offsetof. */
+ t = build_unary_op (ADDR_EXPR, t, 0);
+ return convert (size_type_node, t);
}
OSDN Git Service
