/* Process declarations and variables for C compiler.
Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
- 2001, 2002, 2003 Free Software Foundation, Inc.
+ 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of GCC.
#include "cpplib.h"
#include "target.h"
#include "debug.h"
+#include "opts.h"
#include "timevar.h"
#include "c-common.h"
#include "c-pragma.h"
+#include "langhooks.h"
+#include "tree-mudflap.h"
+#include "tree-gimple.h"
+#include "diagnostic.h"
+#include "tree-dump.h"
#include "cgraph.h"
#include "hashtab.h"
#include "libfuncs.h"
#include "except.h"
+#include "langhooks-def.h"
/* In grokdeclarator, distinguish syntactic contexts of declarators. */
enum decl_context
FUNCDEF, /* Function definition */
PARM, /* Declaration of parm before function body */
FIELD, /* Declaration inside struct or union */
- BITFIELD, /* Likewise but with specified width */
TYPENAME}; /* Typename (inside cast or sizeof) */
\f
/* Nonzero if we have seen an invalid cross reference
to a struct, union, or enum, but not yet printed the message. */
-
tree pending_invalid_xref;
+
/* File and line to appear in the eventual error message. */
location_t pending_invalid_xref_location;
+/* True means we've initialized exception handling. */
+bool c_eh_initialized_p;
+
/* While defining an enum type, this is 1 plus the last enumerator
constant value. Note that will do not have to save this or `enum_overflow'
around nested function definition since such a definition could only
static int enum_overflow;
-/* Parsing a function declarator leaves a list of parameter names
- or a chain of parameter decls here. */
-
-static tree last_function_parms;
-
-/* Parsing a function declarator leaves a chain of structure
- and enum types declared in the parmlist here. */
-
-static tree last_function_parm_tags;
-
-/* After parsing the declarator that starts a function definition,
- `start_function' puts the list of parameter names or chain of decls here
- for `store_parm_decls' to find. */
-
-static tree current_function_parms;
+/* The file and line that the prototype came from if this is an
+ old-style definition; used for diagnostics in
+ store_parm_decls_oldstyle. */
-/* Similar, for last_function_parm_tags. */
+static location_t current_function_prototype_locus;
-static tree current_function_parm_tags;
+/* The argument information structure for the function currently being
+ defined. */
-/* Similar, for the file and line that the prototype came from if this is
- an old-style definition. */
+static struct c_arg_info *current_function_arg_info;
-static location_t current_function_prototype_locus;
+/* The obstack on which parser and related data structures, which are
+ not live beyond their top-level declaration or definition, are
+ allocated. */
+struct obstack parser_obstack;
/* The current statement tree. */
static GTY(()) struct stmt_tree_s c_stmt_tree;
-/* The current scope statement stack. */
-
-static GTY(()) tree c_scope_stmt_stack;
-
-/* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
- that have names. Here so we can clear out their names' definitions
- at the end of the function. */
-
-static GTY(()) tree named_labels;
-
-/* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
-
-static GTY(()) tree shadowed_labels;
-
-/* A list of external DECLs that appeared at block scope when there was
- some other global meaning for that identifier. */
-static GTY(()) tree truly_local_externals;
+/* State saving variables. */
+tree c_break_label;
+tree c_cont_label;
-/* A list of the builtin file-scope DECLs. */
+/* Linked list of TRANSLATION_UNIT_DECLS for the translation units
+ included in this invocation. Note that the current translation
+ unit is not included in this list. */
-static GTY(()) tree builtin_decls;
+static GTY(()) tree all_translation_units;
-/* A DECL for the current file-scope context. */
-
-static GTY(()) tree current_file_decl;
+/* A list of decls to be made automatically visible in each file scope. */
+static GTY(()) tree visible_builtins;
/* Set to 0 at beginning of a function definition, set to 1 if
a return statement that specifies a return value is seen. */
/* Nonzero when starting a function declared `extern inline'. */
static int current_extern_inline;
+
+/* True means global_bindings_p should return false even if the scope stack
+ says we are in file scope. */
+bool c_override_global_bindings_to_false;
+
\f
-/* For each binding contour we allocate a binding_level structure
- * which records the names defined in that contour.
- * Contours include:
- * 0) the global one
- * 1) one for each function definition,
- * where internal declarations of the parameters appear.
- * 2) one for each compound statement,
- * to record its declarations.
- *
- * The current meaning of a name can be found by searching the levels from
- * the current one out to the global one.
- */
-
-struct binding_level GTY(())
- {
- /* A chain of _DECL nodes for all variables, constants, functions,
- and typedef types. These are in the reverse of the order supplied.
- */
- tree names;
+/* Each c_binding structure describes one binding of an identifier to
+ a decl. All the decls in a scope - irrespective of namespace - are
+ chained together by the ->prev field, which (as the name implies)
+ runs in reverse order. All the decls in a given namespace bound to
+ a given identifier are chained by the ->shadowed field, which runs
+ from inner to outer scopes.
+
+ The ->decl field usually points to a DECL node, but there are two
+ exceptions. In the namespace of type tags, the bound entity is a
+ RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
+ identifier is encountered, it is bound to error_mark_node to
+ suppress further errors about that identifier in the current
+ function.
+
+ The ->type field stores the type of the declaration in this scope;
+ if NULL, the type is the type of the ->decl field. This is only of
+ relevance for objects with external or internal linkage which may
+ be redeclared in inner scopes, forming composite types that only
+ persist for the duration of those scopes. In the external scope,
+ this stores the composite of all the types declared for this
+ object, visible or not. The ->inner_comp field (used only at file
+ scope) stores whether an incomplete array type at file scope was
+ completed at an inner scope to an array size other than 1.
+
+ The depth field is copied from the scope structure that holds this
+ decl. It is used to preserve the proper ordering of the ->shadowed
+ field (see bind()) and also for a handful of special-case checks.
+ Finally, the invisible bit is true for a decl which should be
+ ignored for purposes of normal name lookup, and the nested bit is
+ true for a decl that's been bound a second time in an inner scope;
+ in all such cases, the binding in the outer scope will have its
+ invisible bit true. */
+
+struct c_binding GTY((chain_next ("%h.prev")))
+{
+ tree decl; /* the decl bound */
+ tree type; /* the type in this scope */
+ tree id; /* the identifier it's bound to */
+ struct c_binding *prev; /* the previous decl in this scope */
+ struct c_binding *shadowed; /* the innermost decl shadowed by this one */
+ unsigned int depth : 28; /* depth of this scope */
+ BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
+ BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
+ BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
+ /* one free bit */
+};
+#define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
+#define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
+#define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
+#define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
+
+#define I_SYMBOL_BINDING(node) \
+ (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
+#define I_SYMBOL_DECL(node) \
+ (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
+
+#define I_TAG_BINDING(node) \
+ (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
+#define I_TAG_DECL(node) \
+ (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
+
+#define I_LABEL_BINDING(node) \
+ (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
+#define I_LABEL_DECL(node) \
+ (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
+
+/* Each C symbol points to three linked lists of c_binding structures.
+ These describe the values of the identifier in the three different
+ namespaces defined by the language. */
+
+struct lang_identifier GTY(())
+{
+ struct c_common_identifier common_id;
+ struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
+ struct c_binding *tag_binding; /* struct/union/enum tags */
+ struct c_binding *label_binding; /* labels */
+};
+
+/* Validate c-lang.c's assumptions. */
+extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
+[(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
+
+/* The resulting tree type. */
+
+union lang_tree_node
+ GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
+ chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : (union lang_tree_node *) TREE_CHAIN (&%h.generic)")))
+{
+ union tree_node GTY ((tag ("0"),
+ desc ("tree_node_structure (&%h)")))
+ generic;
+ struct lang_identifier GTY ((tag ("1"))) identifier;
+};
+
+/* Each c_scope structure describes the complete contents of one
+ scope. Four scopes are distinguished specially: the innermost or
+ current scope, the innermost function scope, the file scope (always
+ the second to outermost) and the outermost or external scope.
+
+ Most declarations are recorded in the current scope.
+
+ All normal label declarations are recorded in the innermost
+ function scope, as are bindings of undeclared identifiers to
+ error_mark_node. (GCC permits nested functions as an extension,
+ hence the 'innermost' qualifier.) Explicitly declared labels
+ (using the __label__ extension) appear in the current scope.
- /* A list of structure, union and enum definitions,
- * for looking up tag names.
- * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
- * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
- * or ENUMERAL_TYPE node.
- */
- tree tags;
+ Being in the file scope (current_scope == file_scope) causes
+ special behavior in several places below. Also, under some
+ conditions the Objective-C front end records declarations in the
+ file scope even though that isn't the current scope.
- /* For each level, a list of shadowed outer-level definitions
- to be restored when this level is popped.
- Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
- whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
- tree shadowed;
+ All declarations with external linkage are recorded in the external
+ scope, even if they aren't visible there; this models the fact that
+ such declarations are visible to the entire program, and (with a
+ bit of cleverness, see pushdecl) allows diagnosis of some violations
+ of C99 6.2.2p7 and 6.2.7p2:
- /* For each level, a list of shadowed outer-level tag definitions
- to be restored when this level is popped.
- Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
- whose TREE_VALUE is its old definition (a kind of ..._TYPE node). */
- tree shadowed_tags;
+ If, within the same translation unit, the same identifier appears
+ with both internal and external linkage, the behavior is
+ undefined.
- /* For each level (except not the global one),
- a chain of BLOCK nodes for all the levels
- that were entered and exited one level down. */
- tree blocks;
+ All declarations that refer to the same object or function shall
+ have compatible type; otherwise, the behavior is undefined.
- /* The binding level which this one is contained in (inherits from). */
- struct binding_level *level_chain;
+ Initially only the built-in declarations, which describe compiler
+ intrinsic functions plus a subset of the standard library, are in
+ this scope.
- /* Nonzero if we are currently filling this level with parameter
- declarations. */
- char parm_flag;
+ The order of the blocks list matters, and it is frequently appended
+ to. To avoid having to walk all the way to the end of the list on
+ each insertion, or reverse the list later, we maintain a pointer to
+ the last list entry. (FIXME: It should be feasible to use a reversed
+ list here.)
- /* Nonzero if this is the outermost block scope of a function body.
- This scope contains both the parameters and the local variables
- declared in the outermost block. */
- char function_body;
+ The bindings list is strictly in reverse order of declarations;
+ pop_scope relies on this. */
- /* Nonzero means make a BLOCK for this level regardless of all else. */
- char keep;
- /* Nonzero means make a BLOCK if this level has any subblocks. */
- char keep_if_subblocks;
+struct c_scope GTY((chain_next ("%h.outer")))
+{
+ /* The scope containing this one. */
+ struct c_scope *outer;
+
+ /* The next outermost function scope. */
+ struct c_scope *outer_function;
+
+ /* All bindings in this scope. */
+ struct c_binding *bindings;
+
+ /* For each scope (except the global one), a chain of BLOCK nodes
+ for all the scopes that were entered and exited one level down. */
+ tree blocks;
+ tree blocks_last;
+
+ /* The depth of this scope. Used to keep the ->shadowed chain of
+ bindings sorted innermost to outermost. */
+ unsigned int depth : 28;
+
+ /* True if we are currently filling this scope with parameter
+ declarations. */
+ BOOL_BITFIELD parm_flag : 1;
+
+ /* True if we already complained about forward parameter decls
+ in this scope. This prevents double warnings on
+ foo (int a; int b; ...) */
+ BOOL_BITFIELD warned_forward_parm_decls : 1;
+
+ /* True if this is the outermost block scope of a function body.
+ This scope contains the parameters, the local variables declared
+ in the outermost block, and all the labels (except those in
+ nested functions, or declared at block scope with __label__). */
+ BOOL_BITFIELD function_body : 1;
- /* List of decls in `names' that have incomplete structure or
- union types. */
- tree incomplete_list;
+ /* True means make a BLOCK for this scope no matter what. */
+ BOOL_BITFIELD keep : 1;
+};
+
+/* The scope currently in effect. */
+
+static GTY(()) struct c_scope *current_scope;
+
+/* The innermost function scope. Ordinary (not explicitly declared)
+ labels, bindings to error_mark_node, and the lazily-created
+ bindings of __func__ and its friends get this scope. */
- /* A list of decls giving the (reversed) specified order of parms,
- not including any forward-decls in the parmlist.
- This is so we can put the parms in proper order for assign_parms. */
- tree parm_order;
- };
+static GTY(()) struct c_scope *current_function_scope;
-#define NULL_BINDING_LEVEL (struct binding_level *) NULL
+/* The C file scope. This is reset for each input translation unit. */
-/* The binding level currently in effect. */
+static GTY(()) struct c_scope *file_scope;
-static GTY(()) struct binding_level *current_binding_level;
+/* The outermost scope. This is used for all declarations with
+ external linkage, and only these, hence the name. */
-/* A chain of binding_level structures awaiting reuse. */
+static GTY(()) struct c_scope *external_scope;
-static GTY((deletable (""))) struct binding_level *free_binding_level;
+/* A chain of c_scope structures awaiting reuse. */
-/* The outermost binding level, for names of file scope.
- This is created when the compiler is started and exists
- through the entire run. */
+static GTY((deletable)) struct c_scope *scope_freelist;
-static GTY(()) struct binding_level *global_binding_level;
+/* A chain of c_binding structures awaiting reuse. */
-/* Nonzero means unconditionally make a BLOCK for the next level pushed. */
+static GTY((deletable)) struct c_binding *binding_freelist;
-static int keep_next_level_flag;
+/* Append VAR to LIST in scope SCOPE. */
+#define SCOPE_LIST_APPEND(scope, list, decl) do { \
+ struct c_scope *s_ = (scope); \
+ tree d_ = (decl); \
+ if (s_->list##_last) \
+ TREE_CHAIN (s_->list##_last) = d_; \
+ else \
+ s_->list = d_; \
+ s_->list##_last = d_; \
+} while (0)
-/* Nonzero means make a BLOCK for the next level pushed
- if it has subblocks. */
+/* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
+#define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
+ struct c_scope *t_ = (tscope); \
+ struct c_scope *f_ = (fscope); \
+ if (t_->to##_last) \
+ TREE_CHAIN (t_->to##_last) = f_->from; \
+ else \
+ t_->to = f_->from; \
+ t_->to##_last = f_->from##_last; \
+} while (0)
-static int keep_next_if_subblocks;
+/* True means unconditionally make a BLOCK for the next scope pushed. */
-/* The chain of outer levels of label scopes.
- This uses the same data structure used for binding levels,
- but it works differently: each link in the chain records
- saved values of named_labels and shadowed_labels for
- a label binding level outside the current one. */
+static bool keep_next_level_flag;
-static GTY(()) struct binding_level *label_level_chain;
+/* True means the next call to push_scope will be the outermost scope
+ of a function body, so do not push a new scope, merely cease
+ expecting parameter decls. */
+
+static bool next_is_function_body;
/* Functions called automatically at the beginning and end of execution. */
-tree static_ctors, static_dtors;
+static GTY(()) tree static_ctors;
+static GTY(()) tree static_dtors;
/* Forward declarations. */
-
-static struct binding_level *make_binding_level (void);
-static void pop_binding_level (struct binding_level **);
-static int duplicate_decls (tree, tree, int, int);
-static int redeclaration_error_message (tree, tree);
-static void implicit_decl_warning (tree);
-static void storedecls (tree);
-static void storetags (tree);
-static tree lookup_tag (enum tree_code, tree, int);
-static tree lookup_name_current_level (tree);
-static tree grokdeclarator (tree, tree, enum decl_context, int);
-static tree grokparms (tree, int);
-static void layout_array_type (tree);
+static tree lookup_name_in_scope (tree, struct c_scope *);
static tree c_make_fname_decl (tree, int);
-static void c_expand_body_1 (tree, int);
-static tree any_external_decl (tree);
-static void record_external_decl (tree);
-static void warn_if_shadowing (tree, tree);
-static void clone_underlying_type (tree);
-static void pushdecl_function_level (tree, tree);
-static bool flexible_array_type_p (tree);
-static hashval_t link_hash_hash (const void *);
-static int link_hash_eq (const void *, const void *);
+static tree grokdeclarator (const struct c_declarator *,
+ struct c_declspecs *,
+ enum decl_context, bool, tree *);
+static tree grokparms (struct c_arg_info *, bool);
+static void layout_array_type (tree);
\f
/* States indicating how grokdeclarator() should handle declspecs marked
with __attribute__((deprecated)). An object declared as
void
c_print_identifier (FILE *file, tree node, int indent)
{
- print_node (file, "symbol", IDENTIFIER_SYMBOL_VALUE (node), indent + 4);
- print_node (file, "tag", IDENTIFIER_TAG_VALUE (node), indent + 4);
- print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
+ print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
+ print_node (file, "tag", I_TAG_DECL (node), indent + 4);
+ print_node (file, "label", I_LABEL_DECL (node), indent + 4);
if (C_IS_RESERVED_WORD (node))
{
tree rid = ridpointers[C_RID_CODE (node)];
(void *) rid, IDENTIFIER_POINTER (rid));
}
}
+
+/* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
+ which may be any of several kinds of DECL or TYPE or error_mark_node,
+ in the scope SCOPE. */
+static void
+bind (tree name, tree decl, struct c_scope *scope, bool invisible, bool nested)
+{
+ struct c_binding *b, **here;
+
+ if (binding_freelist)
+ {
+ b = binding_freelist;
+ binding_freelist = b->prev;
+ }
+ else
+ b = GGC_NEW (struct c_binding);
+
+ b->shadowed = 0;
+ b->decl = decl;
+ b->id = name;
+ b->depth = scope->depth;
+ b->invisible = invisible;
+ b->nested = nested;
+ b->inner_comp = 0;
+
+ b->type = 0;
+
+ b->prev = scope->bindings;
+ scope->bindings = b;
+
+ if (!name)
+ return;
+
+ switch (TREE_CODE (decl))
+ {
+ case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
+ case ENUMERAL_TYPE:
+ case UNION_TYPE:
+ case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
+ case VAR_DECL:
+ case FUNCTION_DECL:
+ case TYPE_DECL:
+ case CONST_DECL:
+ case PARM_DECL:
+ case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
+
+ default:
+ gcc_unreachable ();
+ }
+
+ /* Locate the appropriate place in the chain of shadowed decls
+ to insert this binding. Normally, scope == current_scope and
+ this does nothing. */
+ while (*here && (*here)->depth > scope->depth)
+ here = &(*here)->shadowed;
+
+ b->shadowed = *here;
+ *here = b;
+}
+
+/* Clear the binding structure B, stick it on the binding_freelist,
+ and return the former value of b->prev. This is used by pop_scope
+ and get_parm_info to iterate destructively over all the bindings
+ from a given scope. */
+static struct c_binding *
+free_binding_and_advance (struct c_binding *b)
+{
+ struct c_binding *prev = b->prev;
+
+ memset (b, 0, sizeof (struct c_binding));
+ b->prev = binding_freelist;
+ binding_freelist = b;
+
+ return prev;
+}
+
\f
/* Hook called at end of compilation to assume 1 elt
- for a top-level tentative array defn that wasn't complete before. */
+ for a file-scope tentative array defn that wasn't complete before. */
void
c_finish_incomplete_decl (tree decl)
tree type = TREE_TYPE (decl);
if (type != error_mark_node
&& TREE_CODE (type) == ARRAY_TYPE
- && ! DECL_EXTERNAL (decl)
+ && !DECL_EXTERNAL (decl)
&& TYPE_DOMAIN (type) == 0)
{
- warning_with_decl (decl, "array `%s' assumed to have one element");
+ warning ("%Jarray %qD assumed to have one element", decl, decl);
complete_array_type (type, NULL_TREE, 1);
}
}
\f
-/* Reuse or create a struct for this binding level. */
+/* The Objective-C front-end often needs to determine the current scope. */
-static struct binding_level *
-make_binding_level (void)
+void *
+objc_get_current_scope (void)
{
- struct binding_level *result;
- if (free_binding_level)
- {
- result = free_binding_level;
- free_binding_level = result->level_chain;
- memset (result, 0, sizeof(struct binding_level));
- }
- else
- result = (struct binding_level *)
- ggc_alloc_cleared (sizeof (struct binding_level));
-
- return result;
+ return current_scope;
}
-/* Remove a binding level from a list and add it to the level chain. */
+/* The following function is used only by Objective-C. It needs to live here
+ because it accesses the innards of c_scope. */
-static void
-pop_binding_level (struct binding_level **lp)
+void
+objc_mark_locals_volatile (void *enclosing_blk)
{
- struct binding_level *l = *lp;
- *lp = l->level_chain;
+ struct c_scope *scope;
+ struct c_binding *b;
+
+ for (scope = current_scope;
+ scope && scope != enclosing_blk;
+ scope = scope->outer)
+ {
+ for (b = scope->bindings; b; b = b->prev)
+ {
+ if (TREE_CODE (b->decl) == VAR_DECL
+ || TREE_CODE (b->decl) == PARM_DECL)
+ {
+ C_DECL_REGISTER (b->decl) = 0;
+ DECL_REGISTER (b->decl) = 0;
+ TREE_THIS_VOLATILE (b->decl) = 1;
+ }
+ }
- memset (l, 0, sizeof (struct binding_level));
- l->level_chain = free_binding_level;
- free_binding_level = l;
+ /* Do not climb up past the current function. */
+ if (scope->function_body)
+ break;
+ }
}
-/* Nonzero if we are currently in the global binding level. */
+/* Nonzero if we are currently in file scope. */
int
global_bindings_p (void)
{
- return current_binding_level == global_binding_level;
+ return current_scope == file_scope && !c_override_global_bindings_to_false;
}
void
keep_next_level (void)
{
- keep_next_level_flag = 1;
+ keep_next_level_flag = true;
}
-/* Identify this binding level as a level of parameters. */
+/* Identify this scope as currently being filled with parameters. */
void
declare_parm_level (void)
{
- current_binding_level->parm_flag = 1;
-}
-
-/* Nonzero if currently making parm declarations. */
-
-int
-in_parm_level_p (void)
-{
- return current_binding_level->parm_flag;
+ current_scope->parm_flag = true;
}
-/* Enter a new binding level. */
-
void
-pushlevel (int dummy ATTRIBUTE_UNUSED)
+push_scope (void)
{
- /* If this is the top level of a function, make sure that
- NAMED_LABELS is 0. */
-
- if (current_binding_level == global_binding_level)
- named_labels = 0;
-
- if (keep_next_if_subblocks)
+ if (next_is_function_body)
{
/* This is the transition from the parameters to the top level
of the function body. These are the same scope
- (C99 6.2.1p4,6) so we do not push another binding level.
-
- XXX Note kludge - keep_next_if_subblocks is set only by
- store_parm_decls, which in turn is called when and only
- when we are about to encounter the opening curly brace for
- the function body. */
- current_binding_level->parm_flag = 0;
- current_binding_level->function_body = 1;
- current_binding_level->keep |= keep_next_level_flag;
- current_binding_level->keep_if_subblocks = 1;
-
- keep_next_level_flag = 0;
- keep_next_if_subblocks = 0;
+ (C99 6.2.1p4,6) so we do not push another scope structure.
+ next_is_function_body is set only by store_parm_decls, which
+ in turn is called when and only when we are about to
+ encounter the opening curly brace for the function body.
+
+ The outermost block of a function always gets a BLOCK node,
+ because the debugging output routines expect that each
+ function has at least one BLOCK. */
+ current_scope->parm_flag = false;
+ current_scope->function_body = true;
+ current_scope->keep = true;
+ current_scope->outer_function = current_function_scope;
+ current_function_scope = current_scope;
+
+ keep_next_level_flag = false;
+ next_is_function_body = false;
}
else
{
- struct binding_level *newlevel = make_binding_level ();
-
- newlevel->keep = keep_next_level_flag;
- newlevel->level_chain = current_binding_level;
- current_binding_level = newlevel;
- keep_next_level_flag = 0;
- }
-}
-
-/* Exit a binding level.
- Pop the level off, and restore the state of the identifier-decl mappings
- that were in effect when this level was entered.
-
- If KEEP is nonzero, this level had explicit declarations, so
- and create a "block" (a BLOCK node) for the level
- to record its declarations and subblocks for symbol table output.
-
- If FUNCTIONBODY is nonzero, this level is the body of a function,
- so create a block as if KEEP were set and also clear out all
- label names.
-
- If REVERSE is nonzero, reverse the order of decls before putting
- them into the BLOCK. */
-
-tree
-poplevel (int keep, int reverse, int functionbody)
-{
- tree link;
- tree block;
- tree decl;
- tree decls = current_binding_level->names;
- tree tags = current_binding_level->tags;
- tree subblocks = current_binding_level->blocks;
+ struct c_scope *scope;
+ if (scope_freelist)
+ {
+ scope = scope_freelist;
+ scope_freelist = scope->outer;
+ }
+ else
+ scope = GGC_CNEW (struct c_scope);
- functionbody |= current_binding_level->function_body;
+ scope->keep = keep_next_level_flag;
+ scope->outer = current_scope;
+ scope->depth = current_scope ? (current_scope->depth + 1) : 0;
- if (keep == KEEP_MAYBE)
- keep = (current_binding_level->names || current_binding_level->tags);
-
- keep |= (current_binding_level->keep || functionbody
- || (subblocks && current_binding_level->keep_if_subblocks));
-
- /* We used to warn about unused variables in expand_end_bindings,
- i.e. while generating RTL. But in function-at-a-time mode we may
- choose to never expand a function at all (e.g. auto inlining), so
- we do this explicitly now.
- No warnings when the global scope is popped because the global
- scope isn't popped for the last translation unit, so the warnings
- are done in c_write_global_declaration. */
- if (current_binding_level != global_binding_level)
- warn_about_unused_variables (decls);
-
- /* Clear out the name-meanings declared on this level.
- Propagate TREE_ADDRESSABLE from nested functions to their
- containing functions. */
- for (link = decls; link; link = TREE_CHAIN (link))
- {
- if (DECL_NAME (link) != 0)
+ /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
+ possible. */
+ if (current_scope && scope->depth == 0)
{
- if (DECL_EXTERNAL (link)
- && current_binding_level != global_binding_level)
- /* External decls stay in the symbol-value slot but are
- inaccessible. */
- C_DECL_INVISIBLE (link) = 1;
- else
- IDENTIFIER_SYMBOL_VALUE (DECL_NAME (link)) = 0;
+ scope->depth--;
+ sorry ("GCC supports only %u nested scopes\n", scope->depth);
}
- if (TREE_CODE (link) == FUNCTION_DECL
- && ! TREE_ASM_WRITTEN (link)
- && DECL_INITIAL (link) != 0
- && TREE_ADDRESSABLE (link)
- && DECL_ABSTRACT_ORIGIN (link) != 0
- && DECL_ABSTRACT_ORIGIN (link) != link)
- TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (link)) = 1;
+ current_scope = scope;
+ keep_next_level_flag = false;
}
+}
- /* Clear out the tag-meanings declared on this level. */
- for (link = tags; link; link = TREE_CHAIN (link))
- if (TREE_PURPOSE (link))
- IDENTIFIER_TAG_VALUE (TREE_PURPOSE (link)) = 0;
-
- /* Restore all name-meanings of the outer levels
- that were shadowed by this level. */
-
- for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
- IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
-
- /* Restore all tag-meanings of the outer levels
- that were shadowed by this level. */
-
- for (link = current_binding_level->shadowed_tags; link;
- link = TREE_CHAIN (link))
- IDENTIFIER_TAG_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
-
- /* If this is the top level block of a function, remove all
- PARM_DECLs from current_binding_level->names; they are already
- stored in DECL_ARGUMENTS of cfun->decl in proper order, should
- not be put in BLOCK_VARS, and furthermore reversing them will
- cause trouble later. They are all together at the end of the
- list. */
- if (functionbody && decls)
- {
- if (TREE_CODE (decls) == PARM_DECL)
- decls = 0;
- else
- {
- link = decls;
- while (TREE_CHAIN (link)
- && TREE_CODE (TREE_CHAIN (link)) != PARM_DECL)
- link = TREE_CHAIN (link);
+/* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
- TREE_CHAIN (link) = 0;
- }
- }
+static void
+set_type_context (tree type, tree context)
+{
+ for (type = TYPE_MAIN_VARIANT (type); type;
+ type = TYPE_NEXT_VARIANT (type))
+ TYPE_CONTEXT (type) = context;
+}
- /* Get the decls in the order they were written.
- Usually current_binding_level->names is in reverse order.
- But parameter decls were previously put in forward order. */
+/* Exit a scope. Restore the state of the identifier-decl mappings
+ that were in effect when this scope was entered. Return a BLOCK
+ node containing all the DECLs in this scope that are of interest
+ to debug info generation. */
- if (reverse)
- decls = nreverse (decls);
+tree
+pop_scope (void)
+{
+ struct c_scope *scope = current_scope;
+ tree block, context, p;
+ struct c_binding *b;
- /* If there were any declarations or structure tags in that level,
- or if this level is a function body,
- create a BLOCK to record them for the life of this function. */
+ bool functionbody = scope->function_body;
+ bool keep = functionbody || scope->keep || scope->bindings;
+ /* If appropriate, create a BLOCK to record the decls for the life
+ of this function. */
block = 0;
if (keep)
{
block = make_node (BLOCK);
- BLOCK_VARS (block) = decls;
- BLOCK_SUBBLOCKS (block) = subblocks;
+ BLOCK_SUBBLOCKS (block) = scope->blocks;
TREE_USED (block) = 1;
- }
- /* In each subblock, record that this is its superior. */
+ /* In each subblock, record that this is its superior. */
+ for (p = scope->blocks; p; p = TREE_CHAIN (p))
+ BLOCK_SUPERCONTEXT (p) = block;
- for (link = subblocks; link; link = TREE_CHAIN (link))
- BLOCK_SUPERCONTEXT (link) = block;
-
- /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
- binding contour so that they point to the appropriate construct, i.e.
- either to the current FUNCTION_DECL node, or else to the BLOCK node
- we just constructed.
-
- Note that for tagged types whose scope is just the formal parameter
- list for some function type specification, we can't properly set
- their TYPE_CONTEXTs here, because we don't have a pointer to the
- appropriate FUNCTION_TYPE node readily available to us. For those
- cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
- in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
- node which will represent the "scope" for these "parameter list local"
- tagged types. */
-
- decl = functionbody ? current_function_decl : block;
- if (decl)
- for (link = tags; link; link = TREE_CHAIN (link))
- TYPE_CONTEXT (TREE_VALUE (link)) = decl;
+ BLOCK_VARS (block) = 0;
+ }
- /* If the level being exited is the top level of a function, check
- over all the labels, and clear out the current (function local)
- meanings of their names. Then add them to BLOCK_VARS. */
+ /* The TYPE_CONTEXTs for all of the tagged types belonging to this
+ scope must be set so that they point to the appropriate
+ construct, i.e. either to the current FUNCTION_DECL node, or
+ else to the BLOCK node we just constructed.
+
+ Note that for tagged types whose scope is just the formal
+ parameter list for some function type specification, we can't
+ properly set their TYPE_CONTEXTs here, because we don't have a
+ pointer to the appropriate FUNCTION_TYPE node readily available
+ to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
+ type nodes get set in `grokdeclarator' as soon as we have created
+ the FUNCTION_TYPE node which will represent the "scope" for these
+ "parameter list local" tagged types. */
+ if (scope->function_body)
+ context = current_function_decl;
+ else if (scope == file_scope)
+ {
+ tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0);
+ TREE_CHAIN (file_decl) = all_translation_units;
+ all_translation_units = file_decl;
+ context = file_decl;
+ }
+ else
+ context = block;
- if (functionbody)
+ /* Clear all bindings in this scope. */
+ for (b = scope->bindings; b; b = free_binding_and_advance (b))
{
- for (link = named_labels; link; link = TREE_CHAIN (link))
+ p = b->decl;
+ switch (TREE_CODE (p))
{
- tree label = TREE_VALUE (link);
+ case LABEL_DECL:
+ /* Warnings for unused labels, errors for undefined labels. */
+ if (TREE_USED (p) && !DECL_INITIAL (p))
+ {
+ error ("%Jlabel %qD used but not defined", p, p);
+ DECL_INITIAL (p) = error_mark_node;
+ }
+ else if (!TREE_USED (p) && warn_unused_label)
+ {
+ if (DECL_INITIAL (p))
+ warning ("%Jlabel %qD defined but not used", p, p);
+ else
+ warning ("%Jlabel %qD declared but not defined", p, p);
+ }
+ /* Labels go in BLOCK_VARS. */
+ TREE_CHAIN (p) = BLOCK_VARS (block);
+ BLOCK_VARS (block) = p;
+ gcc_assert (I_LABEL_BINDING (b->id) == b);
+ I_LABEL_BINDING (b->id) = b->shadowed;
+ break;
+
+ case ENUMERAL_TYPE:
+ case UNION_TYPE:
+ case RECORD_TYPE:
+ set_type_context (p, context);
+
+ /* Types may not have tag-names, in which case the type
+ appears in the bindings list with b->id NULL. */
+ if (b->id)
+ {
+ gcc_assert (I_TAG_BINDING (b->id) == b);
+ I_TAG_BINDING (b->id) = b->shadowed;
+ }
+ break;
+
+ case FUNCTION_DECL:
+ /* Propagate TREE_ADDRESSABLE from nested functions to their
+ containing functions. */
+ if (!TREE_ASM_WRITTEN (p)
+ && DECL_INITIAL (p) != 0
+ && TREE_ADDRESSABLE (p)
+ && DECL_ABSTRACT_ORIGIN (p) != 0
+ && DECL_ABSTRACT_ORIGIN (p) != p)
+ TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
+ goto common_symbol;
+
+ case VAR_DECL:
+ /* Warnings for unused variables. */
+ if (warn_unused_variable
+ && !TREE_USED (p)
+ && !DECL_IN_SYSTEM_HEADER (p)
+ && DECL_NAME (p)
+ && !DECL_ARTIFICIAL (p)
+ && scope != file_scope
+ && scope != external_scope)
+ warning ("%Junused variable %qD", p, p);
+
+ if (b->inner_comp)
+ {
+ error ("%Jtype of array %qD completed incompatibly with"
+ " implicit initialization", p, p);
+ }
+
+ /* Fall through. */
+ case TYPE_DECL:
+ case CONST_DECL:
+ common_symbol:
+ /* All of these go in BLOCK_VARS, but only if this is the
+ binding in the home scope. */
+ if (!b->nested)
+ {
+ TREE_CHAIN (p) = BLOCK_VARS (block);
+ BLOCK_VARS (block) = p;
+ }
+ /* If this is the file scope, and we are processing more
+ than one translation unit in this compilation, set
+ DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
+ This makes same_translation_unit_p work, and causes
+ static declarations to be given disambiguating suffixes. */
+ if (scope == file_scope && num_in_fnames > 1)
+ {
+ DECL_CONTEXT (p) = context;
+ if (TREE_CODE (p) == TYPE_DECL)
+ set_type_context (TREE_TYPE (p), context);
+ }
- if (DECL_INITIAL (label) == 0)
+ /* Fall through. */
+ /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
+ already been put there by store_parm_decls. Unused-
+ parameter warnings are handled by function.c.
+ error_mark_node obviously does not go in BLOCK_VARS and
+ does not get unused-variable warnings. */
+ case PARM_DECL:
+ case ERROR_MARK:
+ /* It is possible for a decl not to have a name. We get
+ here with b->id NULL in this case. */
+ if (b->id)
{
- error_with_decl (label, "label `%s' used but not defined");
- /* Avoid crashing later. */
- define_label (input_location, DECL_NAME (label));
+ gcc_assert (I_SYMBOL_BINDING (b->id) == b);
+ I_SYMBOL_BINDING (b->id) = b->shadowed;
+ if (b->shadowed && b->shadowed->type)
+ TREE_TYPE (b->shadowed->decl) = b->shadowed->type;
}
- else if (warn_unused_label && !TREE_USED (label))
- warning_with_decl (label, "label `%s' defined but not used");
- IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
-
- /* Put the labels into the "variables" of the
- top-level block, so debugger can see them. */
- TREE_CHAIN (label) = BLOCK_VARS (block);
- BLOCK_VARS (block) = label;
+ break;
+
+ default:
+ gcc_unreachable ();
}
}
- /* Pop the current level, and free the structure for reuse. */
-
- pop_binding_level (¤t_binding_level);
/* Dispose of the block that we just made inside some higher level. */
- if (functionbody)
- DECL_INITIAL (current_function_decl) = block;
- else if (block && current_binding_level)
- current_binding_level->blocks
- = chainon (current_binding_level->blocks, block);
- /* If we did not make a block for the level just exited,
- any blocks made for inner levels
- (since they cannot be recorded as subblocks in that level)
- must be carried forward so they will later become subblocks
- of something else. */
- else if (! block && subblocks)
- current_binding_level->blocks
- = chainon (current_binding_level->blocks, subblocks);
+ if ((scope->function_body || scope == file_scope) && context)
+ {
+ DECL_INITIAL (context) = block;
+ BLOCK_SUPERCONTEXT (block) = context;
+ }
+ else if (scope->outer)
+ {
+ if (block)
+ SCOPE_LIST_APPEND (scope->outer, blocks, block);
+ /* If we did not make a block for the scope just exited, any
+ blocks made for inner scopes must be carried forward so they
+ will later become subblocks of something else. */
+ else if (scope->blocks)
+ SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
+ }
- return block;
-}
+ /* Pop the current scope, and free the structure for reuse. */
+ current_scope = scope->outer;
+ if (scope->function_body)
+ current_function_scope = scope->outer_function;
-/* Insert BLOCK at the end of the list of subblocks of the
- current binding level. This is used when a BIND_EXPR is expanded,
- to handle the BLOCK node inside the BIND_EXPR. */
+ memset (scope, 0, sizeof (struct c_scope));
+ scope->outer = scope_freelist;
+ scope_freelist = scope;
-void
-insert_block (tree block)
-{
- TREE_USED (block) = 1;
- current_binding_level->blocks
- = chainon (current_binding_level->blocks, block);
+ return block;
}
-/* Set the BLOCK node for the innermost scope (the one we are
- currently in). The RTL expansion machinery requires us to provide
- this hook, but it is not useful in function-at-a-time mode. */
-
void
-set_block (tree block ATTRIBUTE_UNUSED)
+push_file_scope (void)
{
-}
-\f
-void
-push_label_level (void)
-{
- struct binding_level *newlevel;
+ tree decl;
- newlevel = make_binding_level ();
+ if (file_scope)
+ return;
- /* Add this level to the front of the chain (stack) of label levels. */
+ push_scope ();
+ file_scope = current_scope;
- newlevel->level_chain = label_level_chain;
- label_level_chain = newlevel;
+ start_fname_decls ();
- newlevel->names = named_labels;
- newlevel->shadowed = shadowed_labels;
- named_labels = 0;
- shadowed_labels = 0;
+ for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
+ bind (DECL_NAME (decl), decl, file_scope,
+ /*invisible=*/false, /*nested=*/true);
}
void
-pop_label_level (void)
+pop_file_scope (void)
{
- struct binding_level *level = label_level_chain;
- tree link, prev;
+ /* In case there were missing closebraces, get us back to the global
+ binding level. */
+ while (current_scope != file_scope)
+ pop_scope ();
+
+ /* __FUNCTION__ is defined at file scope (""). This
+ call may not be necessary as my tests indicate it
+ still works without it. */
+ finish_fname_decls ();
- /* Clear out the definitions of the declared labels in this level.
- Leave in the list any ordinary, non-declared labels. */
- for (link = named_labels, prev = 0; link;)
+ /* This is the point to write out a PCH if we're doing that.
+ In that case we do not want to do anything else. */
+ if (pch_file)
{
- if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
- {
- if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
- {
- error_with_decl (TREE_VALUE (link),
- "label `%s' used but not defined");
- /* Avoid crashing later. */
- define_label (input_location, DECL_NAME (TREE_VALUE (link)));
- }
- else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
- warning_with_decl (TREE_VALUE (link),
- "label `%s' defined but not used");
- IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
-
- /* Delete this element from the list. */
- link = TREE_CHAIN (link);
- if (prev)
- TREE_CHAIN (prev) = link;
- else
- named_labels = link;
- }
- else
- {
- prev = link;
- link = TREE_CHAIN (link);
- }
+ c_common_write_pch ();
+ return;
}
- /* Bring back all the labels that were shadowed. */
- for (link = shadowed_labels; link; link = TREE_CHAIN (link))
- if (DECL_NAME (TREE_VALUE (link)) != 0)
- IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
- = TREE_VALUE (link);
+ /* Pop off the file scope and close this translation unit. */
+ pop_scope ();
+ file_scope = 0;
+ cgraph_finalize_compilation_unit ();
+}
- named_labels = chainon (named_labels, level->names);
- shadowed_labels = level->shadowed;
+/* Insert BLOCK at the end of the list of subblocks of the current
+ scope. This is used when a BIND_EXPR is expanded, to handle the
+ BLOCK node inside the BIND_EXPR. */
- /* Pop the current level, and free the structure for reuse. */
- pop_binding_level (&label_level_chain);
+void
+insert_block (tree block)
+{
+ TREE_USED (block) = 1;
+ SCOPE_LIST_APPEND (current_scope, blocks, block);
}
\f
/* Push a definition or a declaration of struct, union or enum tag "name".
Note that the definition may really be just a forward reference.
In that case, the TYPE_SIZE will be zero. */
-void
+static void
pushtag (tree name, tree type)
{
- struct binding_level *b = current_binding_level;
-
- if (name)
- {
- /* Record the identifier as the type's name if it has none. */
-
- if (TYPE_NAME (type) == 0)
- TYPE_NAME (type) = name;
-
- if (IDENTIFIER_TAG_VALUE (name))
- b->shadowed_tags = tree_cons (name, IDENTIFIER_TAG_VALUE (name),
- b->shadowed_tags);
- IDENTIFIER_TAG_VALUE (name) = type;
- }
-
- b->tags = tree_cons (name, type, b->tags);
+ /* Record the identifier as the type's name if it has none. */
+ if (name && !TYPE_NAME (type))
+ TYPE_NAME (type) = name;
+ bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
/* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
- tagged type we just added to the current binding level. This fake
+ tagged type we just added to the current scope. This fake
NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
to output a representation of a tagged type, and it also gives
us a convenient place to record the "scope start" address for the
TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
/* An approximation for now, so we can tell this is a function-scope tag.
- This will be updated in poplevel. */
+ This will be updated in pop_scope. */
TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
}
\f
-/* Handle when a new declaration NEWDECL
- has the same name as an old one OLDDECL
- in the same binding contour.
- Prints an error message if appropriate.
+/* Subroutine of compare_decls. Allow harmless mismatches in return
+ and argument types provided that the type modes match. This function
+ return a unified type given a suitable match, and 0 otherwise. */
+
+static tree
+match_builtin_function_types (tree newtype, tree oldtype)
+{
+ tree newrettype, oldrettype;
+ tree newargs, oldargs;
+ tree trytype, tryargs;
- If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
- Otherwise, return 0.
+ /* Accept the return type of the new declaration if same modes. */
+ oldrettype = TREE_TYPE (oldtype);
+ newrettype = TREE_TYPE (newtype);
- When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
- and OLDDECL is in an outer binding level and should thus not be changed. */
+ if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
+ return 0;
-static int
-duplicate_decls (tree newdecl, tree olddecl, int different_binding_level,
- int different_tu)
-{
- int comptype_flags = (different_tu ? COMPARE_DIFFERENT_TU
- : COMPARE_STRICT);
- int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl),
- comptype_flags);
- int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
- && DECL_INITIAL (newdecl) != 0);
- tree oldtype = TREE_TYPE (olddecl);
- tree newtype = TREE_TYPE (newdecl);
- int errmsg = 0;
+ oldargs = TYPE_ARG_TYPES (oldtype);
+ newargs = TYPE_ARG_TYPES (newtype);
+ tryargs = newargs;
- if (DECL_P (olddecl))
+ while (oldargs || newargs)
{
- if (TREE_CODE (newdecl) == FUNCTION_DECL
- && TREE_CODE (olddecl) == FUNCTION_DECL
- && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
- {
- if (DECL_DECLARED_INLINE_P (newdecl)
- && DECL_UNINLINABLE (newdecl)
- && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
- /* Already warned elsewhere. */;
- else if (DECL_DECLARED_INLINE_P (olddecl)
- && DECL_UNINLINABLE (olddecl)
- && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
- /* Already warned. */;
- else if (DECL_DECLARED_INLINE_P (newdecl)
- && ! DECL_DECLARED_INLINE_P (olddecl)
- && DECL_UNINLINABLE (olddecl)
- && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
- {
- warning_with_decl (newdecl,
- "function `%s' redeclared as inline");
- warning_with_decl (olddecl,
- "previous declaration of function `%s' with attribute noinline");
- }
- else if (DECL_DECLARED_INLINE_P (olddecl)
- && DECL_UNINLINABLE (newdecl)
- && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
- {
- warning_with_decl (newdecl,
- "function `%s' redeclared with attribute noinline");
- warning_with_decl (olddecl,
- "previous declaration of function `%s' was inline");
- }
- }
+ if (!oldargs
+ || !newargs
+ || !TREE_VALUE (oldargs)
+ || !TREE_VALUE (newargs)
+ || TYPE_MODE (TREE_VALUE (oldargs))
+ != TYPE_MODE (TREE_VALUE (newargs)))
+ return 0;
- DECL_ATTRIBUTES (newdecl)
- = (*targetm.merge_decl_attributes) (olddecl, newdecl);
+ oldargs = TREE_CHAIN (oldargs);
+ newargs = TREE_CHAIN (newargs);
}
- if (TREE_CODE (newtype) == ERROR_MARK
- || TREE_CODE (oldtype) == ERROR_MARK)
- types_match = 0;
+ trytype = build_function_type (newrettype, tryargs);
+ return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
+}
- /* New decl is completely inconsistent with the old one =>
- tell caller to replace the old one.
- This is always an error except in the case of shadowing a builtin. */
- if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
+/* Subroutine of diagnose_mismatched_decls. Check for function type
+ mismatch involving an empty arglist vs a nonempty one and give clearer
+ diagnostics. */
+static void
+diagnose_arglist_conflict (tree newdecl, tree olddecl,
+ tree newtype, tree oldtype)
+{
+ tree t;
+
+ if (TREE_CODE (olddecl) != FUNCTION_DECL
+ || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
+ || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
+ ||
+ (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
+ return;
+
+ t = TYPE_ARG_TYPES (oldtype);
+ if (t == 0)
+ t = TYPE_ARG_TYPES (newtype);
+ for (; t; t = TREE_CHAIN (t))
{
- if (TREE_CODE (olddecl) == FUNCTION_DECL
- && DECL_BUILT_IN (olddecl))
+ tree type = TREE_VALUE (t);
+
+ if (TREE_CHAIN (t) == 0
+ && TYPE_MAIN_VARIANT (type) != void_type_node)
{
- /* If you declare a built-in or predefined function name as static,
- the old definition is overridden,
- but optionally warn this was a bad choice of name. */
- if (!TREE_PUBLIC (newdecl))
- {
- if (warn_shadow)
- warning_with_decl (newdecl, "shadowing built-in function `%s'");
- }
- else
- warning_with_decl (newdecl,
- "built-in function `%s' declared as non-function");
+ inform ("a parameter list with an ellipsis can't match "
+ "an empty parameter name list declaration");
+ break;
}
- else
+
+ if (c_type_promotes_to (type) != type)
{
- error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
- error_with_decl (olddecl, "previous declaration of `%s'");
+ inform ("an argument type that has a default promotion can't match "
+ "an empty parameter name list declaration");
+ break;
}
-
- return 0;
}
+}
- /* For real parm decl following a forward decl, return 1 so old decl
- will be reused. Only allow this to happen once. */
- if (types_match && TREE_CODE (newdecl) == PARM_DECL
- && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
- {
- TREE_ASM_WRITTEN (olddecl) = 0;
- return 1;
- }
+/* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
+ old-style function definition, NEWDECL is a prototype declaration.
+ Diagnose inconsistencies in the argument list. Returns TRUE if
+ the prototype is compatible, FALSE if not. */
+static bool
+validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
+{
+ tree newargs, oldargs;
+ int i;
- /* The new declaration is the same kind of object as the old one.
- The declarations may partially match. Print warnings if they don't
- match enough. Ultimately, copy most of the information from the new
- decl to the old one, and keep using the old one. */
+ /* ??? Elsewhere TYPE_MAIN_VARIANT is not used in this context. */
+#define END_OF_ARGLIST(t) (TYPE_MAIN_VARIANT (t) == void_type_node)
- if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
+ oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
+ newargs = TYPE_ARG_TYPES (newtype);
+ i = 1;
+
+ for (;;)
{
- /* A function declaration for a built-in function. */
- if (!TREE_PUBLIC (newdecl))
- {
- /* If you declare a built-in function name as static, the
- built-in definition is overridden,
- but optionally warn this was a bad choice of name. */
- if (warn_shadow)
- warning_with_decl (newdecl, "shadowing built-in function `%s'");
- /* Discard the old built-in function. */
- return 0;
- }
- else if (!types_match)
- {
- /* Accept the return type of the new declaration if same modes. */
- tree oldreturntype = TREE_TYPE (oldtype);
- tree newreturntype = TREE_TYPE (newtype);
+ tree oldargtype = TREE_VALUE (oldargs);
+ tree newargtype = TREE_VALUE (newargs);
- if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
- {
- /* Function types may be shared, so we can't just modify
- the return type of olddecl's function type. */
- tree trytype
- = build_function_type (newreturntype,
- TYPE_ARG_TYPES (oldtype));
- trytype = build_type_attribute_variant (trytype,
- TYPE_ATTRIBUTES (oldtype));
-
- types_match = comptypes (newtype, trytype, comptype_flags);
- if (types_match)
- oldtype = trytype;
- }
- /* Accept harmless mismatch in first argument type also.
- This is for the ffs and fprintf builtins. */
- if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
- && TYPE_ARG_TYPES (oldtype) != 0
- && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
- && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
- && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
- == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
- {
- /* Function types may be shared, so we can't just modify
- the return type of olddecl's function type. */
- tree trytype
- = build_function_type (TREE_TYPE (oldtype),
- tree_cons (NULL_TREE,
- TREE_VALUE (TYPE_ARG_TYPES (newtype)),
- TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
- trytype = build_type_attribute_variant (trytype,
- TYPE_ATTRIBUTES (oldtype));
-
- types_match = comptypes (newtype, trytype, comptype_flags);
- if (types_match)
- oldtype = trytype;
- }
- if (! different_binding_level)
- TREE_TYPE (olddecl) = oldtype;
- }
- else if (TYPE_ARG_TYPES (oldtype) == NULL
- && TYPE_ARG_TYPES (newtype) != NULL)
+ if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
+ break;
+
+ /* Reaching the end of just one list means the two decls don't
+ agree on the number of arguments. */
+ if (END_OF_ARGLIST (oldargtype))
{
- /* For bcmp, bzero, fputs the builtin type has arguments not
- specified. Use the ones from the prototype so that type checking
- is done for them. */
- tree trytype
- = build_function_type (TREE_TYPE (oldtype),
- TYPE_ARG_TYPES (newtype));
- trytype = build_type_attribute_variant (trytype,
- TYPE_ATTRIBUTES (oldtype));
-
- oldtype = trytype;
- if (! different_binding_level)
- TREE_TYPE (olddecl) = oldtype;
+ error ("%Jprototype for %qD declares more arguments "
+ "than previous old-style definition", newdecl, newdecl);
+ return false;
}
- if (!types_match)
+ else if (END_OF_ARGLIST (newargtype))
{
- /* If types don't match for a built-in, throw away the built-in. */
- warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
- return 0;
+ error ("%Jprototype for %qD declares fewer arguments "
+ "than previous old-style definition", newdecl, newdecl);
+ return false;
}
- }
- else if (TREE_CODE (olddecl) == FUNCTION_DECL
- && DECL_SOURCE_LINE (olddecl) == 0)
- {
- /* A function declaration for a predeclared function
- that isn't actually built in. */
- if (!TREE_PUBLIC (newdecl))
+
+ /* Type for passing arg must be consistent with that declared
+ for the arg. */
+ else if (!comptypes (oldargtype, newargtype))
{
- /* If you declare it as static, the
- default definition is overridden. */
- return 0;
+ error ("%Jprototype for %qD declares arg %d with incompatible type",
+ newdecl, newdecl, i);
+ return false;
}
- else if (!types_match)
- {
- /* If the types don't match, preserve volatility indication.
- Later on, we will discard everything else about the
- default declaration. */
- TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
+
+ oldargs = TREE_CHAIN (oldargs);
+ newargs = TREE_CHAIN (newargs);
+ i++;
+ }
+
+ /* If we get here, no errors were found, but do issue a warning
+ for this poor-style construct. */
+ warning ("%Jprototype for %qD follows non-prototype definition",
+ newdecl, newdecl);
+ return true;
+#undef END_OF_ARGLIST
+}
+
+/* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
+ first in a pair of mismatched declarations, using the diagnostic
+ function DIAG. */
+static void
+locate_old_decl (tree decl, void (*diag)(const char *, ...))
+{
+ if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
+ ;
+ else if (DECL_INITIAL (decl))
+ diag (N_("%Jprevious definition of %qD was here"), decl, decl);
+ else if (C_DECL_IMPLICIT (decl))
+ diag (N_("%Jprevious implicit declaration of %qD was here"), decl, decl);
+ else
+ diag (N_("%Jprevious declaration of %qD was here"), decl, decl);
+}
+
+/* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
+ Returns true if the caller should proceed to merge the two, false
+ if OLDDECL should simply be discarded. As a side effect, issues
+ all necessary diagnostics for invalid or poor-style combinations.
+ If it returns true, writes the types of NEWDECL and OLDDECL to
+ *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
+ TREE_TYPE (NEWDECL, OLDDECL) respectively. */
+
+static bool
+diagnose_mismatched_decls (tree newdecl, tree olddecl,
+ tree *newtypep, tree *oldtypep)
+{
+ tree newtype, oldtype;
+ bool pedwarned = false;
+ bool warned = false;
+
+ /* If we have error_mark_node for either decl or type, just discard
+ the previous decl - we're in an error cascade already. */
+ if (olddecl == error_mark_node || newdecl == error_mark_node)
+ return false;
+ *oldtypep = oldtype = TREE_TYPE (olddecl);
+ *newtypep = newtype = TREE_TYPE (newdecl);
+ if (oldtype == error_mark_node || newtype == error_mark_node)
+ return false;
+
+ /* Two different categories of symbol altogether. This is an error
+ unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
+ if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
+ {
+ if (!(TREE_CODE (olddecl) == FUNCTION_DECL
+ && DECL_BUILT_IN (olddecl)
+ && !C_DECL_DECLARED_BUILTIN (olddecl)))
+ {
+ error ("%J%qD redeclared as different kind of symbol",
+ newdecl, newdecl);
+ locate_old_decl (olddecl, error);
}
+ else if (TREE_PUBLIC (newdecl))
+ warning ("%Jbuilt-in function %qD declared as non-function",
+ newdecl, newdecl);
+ else if (warn_shadow)
+ warning ("%Jdeclaration of %qD shadows a built-in function",
+ newdecl, newdecl);
+ return false;
}
- /* Permit char *foo () to match void *foo (...) if not pedantic,
- if one of them came from a system header file. */
- else if (!types_match
- && TREE_CODE (olddecl) == FUNCTION_DECL
- && TREE_CODE (newdecl) == FUNCTION_DECL
- && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
- && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
- && (DECL_IN_SYSTEM_HEADER (olddecl)
- || DECL_IN_SYSTEM_HEADER (newdecl))
- && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
- && TYPE_ARG_TYPES (oldtype) == 0
- && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
- && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
- ||
- (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
- && TYPE_ARG_TYPES (newtype) == 0
- && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
- && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
+
+ /* Enumerators have no linkage, so may only be declared once in a
+ given scope. */
+ if (TREE_CODE (olddecl) == CONST_DECL)
+ {
+ error ("%Jredeclaration of enumerator %qD", newdecl, newdecl);
+ locate_old_decl (olddecl, error);
+ return false;
+ }
+
+ if (!comptypes (oldtype, newtype))
{
- if (pedantic)
- pedwarn_with_decl (newdecl, "conflicting types for `%s'");
- /* Make sure we keep void * as ret type, not char *. */
- if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
- TREE_TYPE (newdecl) = newtype = oldtype;
-
- /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
- we will come back here again. */
- DECL_IN_SYSTEM_HEADER (newdecl) = 1;
- }
- /* Permit void foo (...) to match int foo (...) if the latter is the
- definition and implicit int was used. See c-torture/compile/920625-2.c. */
- else if (!types_match && new_is_definition
- && TREE_CODE (olddecl) == FUNCTION_DECL
- && TREE_CODE (newdecl) == FUNCTION_DECL
- && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
- && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
- && C_FUNCTION_IMPLICIT_INT (newdecl))
- {
- pedwarn_with_decl (newdecl, "conflicting types for `%s'");
- /* Make sure we keep void as the return type. */
- TREE_TYPE (newdecl) = newtype = oldtype;
- C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
- }
- else if (!types_match
- /* Permit char *foo (int, ...); followed by char *foo ();
- if not pedantic. */
- && ! (TREE_CODE (olddecl) == FUNCTION_DECL
- && ! pedantic
- /* Return types must still match. */
- && comptypes (TREE_TYPE (oldtype),
- TREE_TYPE (newtype), comptype_flags)
- && TYPE_ARG_TYPES (newtype) == 0))
- {
- error_with_decl (newdecl, "conflicting types for `%s'");
- /* Check for function type mismatch
- involving an empty arglist vs a nonempty one. */
if (TREE_CODE (olddecl) == FUNCTION_DECL
- && comptypes (TREE_TYPE (oldtype),
- TREE_TYPE (newtype), comptype_flags)
- && ((TYPE_ARG_TYPES (oldtype) == 0
- && DECL_INITIAL (olddecl) == 0)
- ||
- (TYPE_ARG_TYPES (newtype) == 0
- && DECL_INITIAL (newdecl) == 0)))
+ && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
{
- /* Classify the problem further. */
- tree t = TYPE_ARG_TYPES (oldtype);
- if (t == 0)
- t = TYPE_ARG_TYPES (newtype);
- for (; t; t = TREE_CHAIN (t))
- {
- tree type = TREE_VALUE (t);
-
- if (TREE_CHAIN (t) == 0
- && TYPE_MAIN_VARIANT (type) != void_type_node)
- {
- error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
- break;
- }
+ /* Accept harmless mismatch in function types.
+ This is for the ffs and fprintf builtins. */
+ tree trytype = match_builtin_function_types (newtype, oldtype);
- if (c_type_promotes_to (type) != type)
- {
- error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
- break;
- }
+ if (trytype && comptypes (newtype, trytype))
+ *oldtypep = oldtype = trytype;
+ else
+ {
+ /* If types don't match for a built-in, throw away the
+ built-in. No point in calling locate_old_decl here, it
+ won't print anything. */
+ warning ("%Jconflicting types for built-in function %qD",
+ newdecl, newdecl);
+ return false;
}
}
- if (C_DECL_IMPLICIT (olddecl))
- error_with_decl (olddecl, "previous implicit declaration of `%s'");
+ else if (TREE_CODE (olddecl) == FUNCTION_DECL
+ && DECL_IS_BUILTIN (olddecl))
+ {
+ /* A conflicting function declaration for a predeclared
+ function that isn't actually built in. Objective C uses
+ these. The new declaration silently overrides everything
+ but the volatility (i.e. noreturn) indication. See also
+ below. FIXME: Make Objective C use normal builtins. */
+ TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
+ return false;
+ }
+ /* Permit void foo (...) to match int foo (...) if the latter is
+ the definition and implicit int was used. See
+ c-torture/compile/920625-2.c. */
+ else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
+ && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
+ && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
+ && C_FUNCTION_IMPLICIT_INT (newdecl))
+ {
+ pedwarn ("%Jconflicting types for %qD", newdecl, newdecl);
+ /* Make sure we keep void as the return type. */
+ TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
+ C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
+ pedwarned = true;
+ }
else
- error_with_decl (olddecl, "previous declaration of `%s'");
-
- /* This is safer because the initializer might contain references
- to variables that were declared between olddecl and newdecl. This
- will make the initializer invalid for olddecl in case it gets
- assigned to olddecl below. */
- if (TREE_CODE (newdecl) == VAR_DECL)
- DECL_INITIAL (newdecl) = 0;
- }
- /* TLS cannot follow non-TLS declaration. */
- else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
- && !DECL_THREAD_LOCAL (olddecl) && DECL_THREAD_LOCAL (newdecl))
- {
- error_with_decl (newdecl, "thread-local declaration of `%s' follows non thread-local declaration");
- error_with_decl (olddecl, "previous declaration of `%s'");
+ {
+ if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
+ error ("%J conflicting type qualifiers for %qD", newdecl, newdecl);
+ else
+ error ("%Jconflicting types for %qD", newdecl, newdecl);
+ diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
+ locate_old_decl (olddecl, error);
+ return false;
+ }
}
- /* non-TLS declaration cannot follow TLS declaration. */
- else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
- && DECL_THREAD_LOCAL (olddecl) && !DECL_THREAD_LOCAL (newdecl))
+
+ /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
+ but silently ignore the redeclaration if either is in a system
+ header. (Conflicting redeclarations were handled above.) */
+ if (TREE_CODE (newdecl) == TYPE_DECL)
{
- error_with_decl (newdecl, "non thread-local declaration of `%s' follows thread-local declaration");
- error_with_decl (olddecl, "previous declaration of `%s'");
+ if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
+ return true; /* Allow OLDDECL to continue in use. */
+
+ error ("%Jredefinition of typedef %qD", newdecl, newdecl);
+ locate_old_decl (olddecl, error);
+ return false;
}
- else
+
+ /* Function declarations can either be 'static' or 'extern' (no
+ qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
+ can never conflict with each other on account of linkage (6.2.2p4).
+ Multiple definitions are not allowed (6.9p3,5) but GCC permits
+ two definitions if one is 'extern inline' and one is not. The non-
+ extern-inline definition supersedes the extern-inline definition. */
+ else if (TREE_CODE (newdecl) == FUNCTION_DECL)
{
- errmsg = redeclaration_error_message (newdecl, olddecl);
- if (errmsg)
+ /* If you declare a built-in function name as static, or
+ define the built-in with an old-style definition (so we
+ can't validate the argument list) the built-in definition is
+ overridden, but optionally warn this was a bad choice of name. */
+ if (DECL_BUILT_IN (olddecl)
+ && !C_DECL_DECLARED_BUILTIN (olddecl)
+ && (!TREE_PUBLIC (newdecl)
+ || (DECL_INITIAL (newdecl)
+ && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
+ {
+ if (warn_shadow)
+ warning ("%Jdeclaration of %qD shadows a built-in function",
+ newdecl, newdecl);
+ /* Discard the old built-in function. */
+ return false;
+ }
+
+ if (DECL_INITIAL (newdecl))
{
- switch (errmsg)
+ if (DECL_INITIAL (olddecl)
+ && !(DECL_DECLARED_INLINE_P (olddecl)
+ && DECL_EXTERNAL (olddecl)
+ && !(DECL_DECLARED_INLINE_P (newdecl)
+ && DECL_EXTERNAL (newdecl)
+ && same_translation_unit_p (olddecl, newdecl))))
{
- case 1:
- error_with_decl (newdecl, "redefinition of `%s'");
- break;
- case 2:
- error_with_decl (newdecl, "redeclaration of `%s'");
- break;
- case 3:
- error_with_decl (newdecl, "conflicting declarations of `%s'");
- break;
- default:
- abort ();
+ error ("%Jredefinition of %qD", newdecl, newdecl);
+ locate_old_decl (olddecl, error);
+ return false;
+ }
+ }
+ /* If we have a prototype after an old-style function definition,
+ the argument types must be checked specially. */
+ else if (DECL_INITIAL (olddecl)
+ && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
+ && TYPE_ACTUAL_ARG_TYPES (oldtype)
+ && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
+ {
+ locate_old_decl (olddecl, error);
+ return false;
+ }
+ /* A non-static declaration (even an "extern") followed by a
+ static declaration is undefined behavior per C99 6.2.2p3-5,7.
+ The same is true for a static forward declaration at block
+ scope followed by a non-static declaration/definition at file
+ scope. Static followed by non-static at the same scope is
+ not undefined behavior, and is the most convenient way to get
+ some effects (see e.g. what unwind-dw2-fde-glibc.c does to
+ the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
+ we do diagnose it if -Wtraditional. */
+ if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
+ {
+ /* Two exceptions to the rule. If olddecl is an extern
+ inline, or a predeclared function that isn't actually
+ built in, newdecl silently overrides olddecl. The latter
+ occur only in Objective C; see also above. (FIXME: Make
+ Objective C use normal builtins.) */
+ if (!DECL_IS_BUILTIN (olddecl)
+ && !(DECL_EXTERNAL (olddecl)
+ && DECL_DECLARED_INLINE_P (olddecl)))
+ {
+ error ("%Jstatic declaration of %qD follows "
+ "non-static declaration", newdecl, newdecl);
+ locate_old_decl (olddecl, error);
+ }
+ return false;
+ }
+ else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
+ {
+ if (DECL_CONTEXT (olddecl))
+ {
+ error ("%Jnon-static declaration of %qD follows "
+ "static declaration", newdecl, newdecl);
+ locate_old_decl (olddecl, error);
+ return false;
+ }
+ else if (warn_traditional)
+ {
+ warning ("%Jnon-static declaration of %qD follows "
+ "static declaration", newdecl, newdecl);
+ warned = true;
}
+ }
+ }
+ else if (TREE_CODE (newdecl) == VAR_DECL)
+ {
+ /* Only variables can be thread-local, and all declarations must
+ agree on this property. */
+ if (DECL_THREAD_LOCAL (newdecl) != DECL_THREAD_LOCAL (olddecl))
+ {
+ if (DECL_THREAD_LOCAL (newdecl))
+ error ("%Jthread-local declaration of %qD follows "
+ "non-thread-local declaration", newdecl, newdecl);
+ else
+ error ("%Jnon-thread-local declaration of %qD follows "
+ "thread-local declaration", newdecl, newdecl);
- error_with_decl (olddecl,
- ((DECL_INITIAL (olddecl)
- && current_binding_level == global_binding_level)
- ? "`%s' previously defined here"
- : "`%s' previously declared here"));
- return 0;
+ locate_old_decl (olddecl, error);
+ return false;
}
- else if (TREE_CODE (newdecl) == TYPE_DECL
- && (DECL_IN_SYSTEM_HEADER (olddecl)
- || DECL_IN_SYSTEM_HEADER (newdecl)))
+
+ /* Multiple initialized definitions are not allowed (6.9p3,5). */
+ if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
{
- warning_with_decl (newdecl, "redefinition of `%s'");
- warning_with_decl
- (olddecl,
- ((DECL_INITIAL (olddecl)
- && current_binding_level == global_binding_level)
- ? "`%s' previously defined here"
- : "`%s' previously declared here"));
+ error ("%Jredefinition of %qD", newdecl, newdecl);
+ locate_old_decl (olddecl, error);
+ return false;
}
- else if (TREE_CODE (olddecl) == FUNCTION_DECL
- && DECL_INITIAL (olddecl) != 0
- && TYPE_ARG_TYPES (oldtype) == 0
- && TYPE_ARG_TYPES (newtype) != 0
- && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
+
+ /* Objects declared at file scope: if the first declaration had
+ external linkage (even if it was an external reference) the
+ second must have external linkage as well, or the behavior is
+ undefined. If the first declaration had internal linkage, then
+ the second must too, or else be an external reference (in which
+ case the composite declaration still has internal linkage).
+ As for function declarations, we warn about the static-then-
+ extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
+ if (DECL_FILE_SCOPE_P (newdecl)
+ && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
{
- tree type, parm;
- int nargs;
- /* Prototype decl follows defn w/o prototype. */
-
- for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
- type = TYPE_ARG_TYPES (newtype),
- nargs = 1;
- ;
- parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
+ if (DECL_EXTERNAL (newdecl))
{
- if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
- && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
- {
- warning_with_decl (newdecl, "prototype for `%s' follows");
- warning_with_decl (olddecl, "non-prototype definition here");
- break;
- }
- if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
- || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
+ if (!DECL_FILE_SCOPE_P (olddecl))
{
- error_with_decl (newdecl,
- "prototype for `%s' follows and number of arguments doesn't match");
- error_with_decl (olddecl, "non-prototype definition here");
- errmsg = 1;
- break;
+ error ("%Jextern declaration of %qD follows "
+ "declaration with no linkage", newdecl, newdecl);
+ locate_old_decl (olddecl, error);
+ return false;
}
- /* Type for passing arg must be consistent
- with that declared for the arg. */
- if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type),
- comptype_flags))
+ else if (warn_traditional)
{
- error_with_decl (newdecl,
- "prototype for `%s' follows and argument %d doesn't match",
- nargs);
- error_with_decl (olddecl, "non-prototype definition here");
- errmsg = 1;
- break;
+ warning ("%Jnon-static declaration of %qD follows "
+ "static declaration", newdecl, newdecl);
+ warned = true;
}
}
+ else
+ {
+ if (TREE_PUBLIC (newdecl))
+ error ("%Jnon-static declaration of %qD follows "
+ "static declaration", newdecl, newdecl);
+ else
+ error ("%Jstatic declaration of %qD follows "
+ "non-static declaration", newdecl, newdecl);
+
+ locate_old_decl (olddecl, error);
+ return false;
+ }
}
- /* Warn about mismatches in various flags. */
- else
+ /* Two objects with the same name declared at the same block
+ scope must both be external references (6.7p3). */
+ else if (!DECL_FILE_SCOPE_P (newdecl))
{
- /* Warn if function is now inline
- but was previously declared not inline and has been called. */
- if (TREE_CODE (olddecl) == FUNCTION_DECL
- && ! DECL_DECLARED_INLINE_P (olddecl)
- && DECL_DECLARED_INLINE_P (newdecl)
- && TREE_USED (olddecl))
- warning_with_decl (newdecl,
- "`%s' declared inline after being called");
- if (TREE_CODE (olddecl) == FUNCTION_DECL
- && ! DECL_DECLARED_INLINE_P (olddecl)
- && DECL_DECLARED_INLINE_P (newdecl)
- && DECL_INITIAL (olddecl) != 0)
- warning_with_decl (newdecl,
- "`%s' declared inline after its definition");
-
- /* If pedantic, warn when static declaration follows a non-static
- declaration. Otherwise, do so only for functions. */
- if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
- && TREE_PUBLIC (olddecl)
- && !TREE_PUBLIC (newdecl))
- warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
-
- /* If warn_traditional, warn when a non-static function
- declaration follows a static one. */
- if (warn_traditional && !in_system_header
- && TREE_CODE (olddecl) == FUNCTION_DECL
- && !TREE_PUBLIC (olddecl)
- && TREE_PUBLIC (newdecl))
- warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
-
- /* Warn when const declaration follows a non-const
- declaration, but not for functions. */
- if (TREE_CODE (olddecl) != FUNCTION_DECL
- && !TREE_READONLY (olddecl)
- && TREE_READONLY (newdecl))
- warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
- /* These bits are logically part of the type, for variables.
- But not for functions
- (where qualifiers are not valid ANSI anyway). */
- else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
- && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
- || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
- pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
+ if (DECL_EXTERNAL (newdecl))
+ {
+ /* Extern with initializer at block scope, which will
+ already have received an error. */
+ }
+ else if (DECL_EXTERNAL (olddecl))
+ {
+ error ("%Jdeclaration of %qD with no linkage follows "
+ "extern declaration", newdecl, newdecl);
+ locate_old_decl (olddecl, error);
+ }
+ else
+ {
+ error ("%Jredeclaration of %qD with no linkage",
+ newdecl, newdecl);
+ locate_old_decl (olddecl, error);
+ }
+
+ return false;
}
}
- /* Optionally warn about more than one declaration for the same name. */
- if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
- /* Don't warn about a function declaration
- followed by a definition. */
- && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
- && DECL_INITIAL (olddecl) == 0)
- /* Don't warn about extern decl followed by (tentative) definition. */
- && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
+ /* warnings */
+ /* All decls must agree on a visibility. */
+ if (DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
+ && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
{
- warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
- warning_with_decl (olddecl, "previous declaration of `%s'");
+ warning ("%Jredeclaration of %qD with different visibility "
+ "(old visibility preserved)", newdecl, newdecl);
+ warned = true;
}
- /* Copy all the DECL_... slots specified in the new decl
- except for any that we copy here from the old type.
-
- Past this point, we don't change OLDTYPE and NEWTYPE
- even if we change the types of NEWDECL and OLDDECL. */
-
- if (types_match)
+ if (TREE_CODE (newdecl) == FUNCTION_DECL)
{
- /* When copying info to olddecl, we store into write_olddecl
- instead. This allows us to avoid modifying olddecl when
- different_binding_level is true. */
- tree write_olddecl = different_binding_level ? newdecl : olddecl;
-
- /* Merge the data types specified in the two decls. */
- if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
+ /* Diagnose inline __attribute__ ((noinline)) which is silly. */
+ if (DECL_DECLARED_INLINE_P (newdecl)
+ && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
{
- if (different_binding_level)
- {
- if (TYPE_ARG_TYPES (oldtype) != 0
- && TYPE_ARG_TYPES (newtype) == 0)
- TREE_TYPE (newdecl) = common_type (newtype, oldtype);
- else
- TREE_TYPE (newdecl)
- = build_type_attribute_variant
- (newtype,
- merge_attributes (TYPE_ATTRIBUTES (newtype),
- TYPE_ATTRIBUTES (oldtype)));
- }
- else
- TREE_TYPE (newdecl)
- = TREE_TYPE (olddecl)
- = common_type (newtype, oldtype);
+ warning ("%Jinline declaration of %qD follows "
+ "declaration with attribute noinline", newdecl, newdecl);
+ warned = true;
+ }
+ else if (DECL_DECLARED_INLINE_P (olddecl)
+ && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
+ {
+ warning ("%Jdeclaration of %qD with attribute noinline follows "
+ "inline declaration ", newdecl, newdecl);
+ warned = true;
}
- /* Lay the type out, unless already done. */
- if (oldtype != TREE_TYPE (newdecl))
+ /* Inline declaration after use or definition.
+ ??? Should we still warn about this now we have unit-at-a-time
+ mode and can get it right?
+ Definitely don't complain if the decls are in different translation
+ units. */
+ if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl)
+ && same_translation_unit_p (olddecl, newdecl))
{
- if (TREE_TYPE (newdecl) != error_mark_node)
- layout_type (TREE_TYPE (newdecl));
- if (TREE_CODE (newdecl) != FUNCTION_DECL
- && TREE_CODE (newdecl) != TYPE_DECL
- && TREE_CODE (newdecl) != CONST_DECL)
- layout_decl (newdecl, 0);
+ if (TREE_USED (olddecl))
+ {
+ warning ("%J%qD declared inline after being called",
+ olddecl, olddecl);
+ warned = true;
+ }
+ else if (DECL_INITIAL (olddecl))
+ {
+ warning ("%J%qD declared inline after its definition",
+ olddecl, olddecl);
+ warned = true;
+ }
}
- else
+ }
+ else /* PARM_DECL, VAR_DECL */
+ {
+ /* Redeclaration of a parameter is a constraint violation (this is
+ not explicitly stated, but follows from C99 6.7p3 [no more than
+ one declaration of the same identifier with no linkage in the
+ same scope, except type tags] and 6.2.2p6 [parameters have no
+ linkage]). We must check for a forward parameter declaration,
+ indicated by TREE_ASM_WRITTEN on the old declaration - this is
+ an extension, the mandatory diagnostic for which is handled by
+ mark_forward_parm_decls. */
+
+ if (TREE_CODE (newdecl) == PARM_DECL
+ && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
{
- /* Since the type is OLDDECL's, make OLDDECL's size go with. */
- DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
- DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
- DECL_MODE (newdecl) = DECL_MODE (olddecl);
- if (TREE_CODE (olddecl) != FUNCTION_DECL)
- if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
- {
- DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
- DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
- }
+ error ("%Jredefinition of parameter %qD", newdecl, newdecl);
+ locate_old_decl (olddecl, error);
+ return false;
}
+ }
- /* Keep the old rtl since we can safely use it. */
- COPY_DECL_RTL (olddecl, newdecl);
+ /* Optional warning for completely redundant decls. */
+ if (!warned && !pedwarned
+ && warn_redundant_decls
+ /* Don't warn about a function declaration followed by a
+ definition. */
+ && !(TREE_CODE (newdecl) == FUNCTION_DECL
+ && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
+ /* Don't warn about redundant redeclarations of builtins. */
+ && !(TREE_CODE (newdecl) == FUNCTION_DECL
+ && !DECL_BUILT_IN (newdecl)
+ && DECL_BUILT_IN (olddecl)
+ && !C_DECL_DECLARED_BUILTIN (olddecl))
+ /* Don't warn about an extern followed by a definition. */
+ && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
+ /* Don't warn about forward parameter decls. */
+ && !(TREE_CODE (newdecl) == PARM_DECL
+ && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)))
+ {
+ warning ("%Jredundant redeclaration of %qD", newdecl, newdecl);
+ warned = true;
+ }
- /* Merge the type qualifiers. */
- if (TREE_READONLY (newdecl))
- TREE_READONLY (write_olddecl) = 1;
+ /* Report location of previous decl/defn in a consistent manner. */
+ if (warned || pedwarned)
+ locate_old_decl (olddecl, pedwarned ? pedwarn : warning);
- if (TREE_THIS_VOLATILE (newdecl))
- {
- TREE_THIS_VOLATILE (write_olddecl) = 1;
- if (TREE_CODE (newdecl) == VAR_DECL
- /* If an automatic variable is re-declared in the same
- function scope, but the old declaration was not
- volatile, make_var_volatile() would crash because the
- variable would have been assigned to a pseudo, not a
- MEM. Since this duplicate declaration is invalid
- anyway, we just skip the call. */
- && errmsg == 0)
- make_var_volatile (newdecl);
- }
+ return true;
+}
- /* Keep source location of definition rather than declaration. */
- /* When called with different_binding_level set, keep the old
- information so that meaningful diagnostics can be given. */
- if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
- && ! different_binding_level)
- {
- DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
- DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
- }
+/* Subroutine of duplicate_decls. NEWDECL has been found to be
+ consistent with OLDDECL, but carries new information. Merge the
+ new information into OLDDECL. This function issues no
+ diagnostics. */
- /* Merge the unused-warning information. */
- if (DECL_IN_SYSTEM_HEADER (olddecl))
- DECL_IN_SYSTEM_HEADER (newdecl) = 1;
- else if (DECL_IN_SYSTEM_HEADER (newdecl))
- DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
-
- /* Merge the initialization information. */
- /* When called with different_binding_level set, don't copy over
- DECL_INITIAL, so that we don't accidentally change function
- declarations into function definitions. */
- if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
- DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
-
- /* Merge the section attribute.
- We want to issue an error if the sections conflict but that must be
- done later in decl_attributes since we are called before attributes
- are assigned. */
- if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
- DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
-
- /* Copy the assembler name.
- Currently, it can only be defined in the prototype. */
- COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
-
- if (TREE_CODE (newdecl) == FUNCTION_DECL)
- {
- DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
- DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
- DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
- DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
- |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
- TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
- TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
- DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
- DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
- }
+static void
+merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
+{
+ int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
+ && DECL_INITIAL (newdecl) != 0);
+
+ /* For real parm decl following a forward decl, rechain the old decl
+ in its new location and clear TREE_ASM_WRITTEN (it's not a
+ forward decl anymore). */
+ if (TREE_CODE (newdecl) == PARM_DECL
+ && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
+ {
+ struct c_binding *b, **here;
+
+ for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
+ if ((*here)->decl == olddecl)
+ goto found;
+ gcc_unreachable ();
+
+ found:
+ b = *here;
+ *here = b->prev;
+ b->prev = current_scope->bindings;
+ current_scope->bindings = b;
+
+ TREE_ASM_WRITTEN (olddecl) = 0;
+ }
+
+ DECL_ATTRIBUTES (newdecl)
+ = targetm.merge_decl_attributes (olddecl, newdecl);
+
+ /* Merge the data types specified in the two decls. */
+ TREE_TYPE (newdecl)
+ = TREE_TYPE (olddecl)
+ = composite_type (newtype, oldtype);
+
+ /* Lay the type out, unless already done. */
+ if (!comptypes (oldtype, TREE_TYPE (newdecl)))
+ {
+ if (TREE_TYPE (newdecl) != error_mark_node)
+ layout_type (TREE_TYPE (newdecl));
+ if (TREE_CODE (newdecl) != FUNCTION_DECL
+ && TREE_CODE (newdecl) != TYPE_DECL
+ && TREE_CODE (newdecl) != CONST_DECL)
+ layout_decl (newdecl, 0);
+ }
+ else
+ {
+ /* Since the type is OLDDECL's, make OLDDECL's size go with. */
+ DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
+ DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
+ DECL_MODE (newdecl) = DECL_MODE (olddecl);
+ if (TREE_CODE (olddecl) != FUNCTION_DECL)
+ if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
+ {
+ DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
+ DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
+ }
}
- /* If cannot merge, then use the new type and qualifiers,
- and don't preserve the old rtl. */
- else if (! different_binding_level)
+
+ /* Keep the old rtl since we can safely use it. */
+ COPY_DECL_RTL (olddecl, newdecl);
+
+ /* Merge the type qualifiers. */
+ if (TREE_READONLY (newdecl))
+ TREE_READONLY (olddecl) = 1;
+
+ if (TREE_THIS_VOLATILE (newdecl))
+ {
+ TREE_THIS_VOLATILE (olddecl) = 1;
+ if (TREE_CODE (newdecl) == VAR_DECL)
+ make_var_volatile (newdecl);
+ }
+
+ /* Merge deprecatedness. */
+ if (TREE_DEPRECATED (newdecl))
+ TREE_DEPRECATED (olddecl) = 1;
+
+ /* Keep source location of definition rather than declaration. */
+ if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
+ DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
+
+ /* Merge the unused-warning information. */
+ if (DECL_IN_SYSTEM_HEADER (olddecl))
+ DECL_IN_SYSTEM_HEADER (newdecl) = 1;
+ else if (DECL_IN_SYSTEM_HEADER (newdecl))
+ DECL_IN_SYSTEM_HEADER (olddecl) = 1;
+
+ /* Merge the initialization information. */
+ if (DECL_INITIAL (newdecl) == 0)
+ DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
+
+ /* Merge the section attribute.
+ We want to issue an error if the sections conflict but that must be
+ done later in decl_attributes since we are called before attributes
+ are assigned. */
+ if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
+ DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
+
+ /* Copy the assembler name.
+ Currently, it can only be defined in the prototype. */
+ COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
+
+ /* Use visibility of whichever declaration had it specified */
+ if (DECL_VISIBILITY_SPECIFIED (olddecl))
+ {
+ DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
+ DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
+ }
+
+ if (TREE_CODE (newdecl) == FUNCTION_DECL)
{
- TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
- TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
- TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
- TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
+ DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
+ DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
+ DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
+ DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
+ |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
+ TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
+ TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
+ DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
+ DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
}
/* Merge the storage class information. */
TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
/* This is since we don't automatically
copy the attributes of NEWDECL into OLDDECL. */
- /* No need to worry about different_binding_level here because
- then TREE_PUBLIC (newdecl) was true. */
TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
/* If this clears `static', clear it in the identifier too. */
- if (! TREE_PUBLIC (olddecl))
+ if (!TREE_PUBLIC (olddecl))
TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
}
if (DECL_EXTERNAL (newdecl))
{
- if (! different_binding_level || different_tu)
- {
- /* Don't mess with these flags on local externs; they remain
- external even if there's a declaration at file scope which
- isn't. */
- TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
- DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
- }
+ TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
+ DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
+
/* An extern decl does not override previous storage class. */
TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
- if (! DECL_EXTERNAL (newdecl))
+ if (!DECL_EXTERNAL (newdecl))
{
DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
- /* If we have two non-EXTERNAL file-scope decls that are
- the same, only one of them should be written out. */
- if (different_tu)
- TREE_ASM_WRITTEN (newdecl) = 1;
+ DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
}
}
else
been written out yet. */
if (new_is_definition && DECL_INITIAL (olddecl))
{
- if (TREE_USED (olddecl))
+ if (TREE_USED (olddecl)
+ /* In unit-at-a-time mode we never inline re-defined extern
+ inline functions. */
+ && !flag_unit_at_a_time
+ && cgraph_function_possibly_inlined_p (olddecl))
(*debug_hooks->outlining_inline_function) (olddecl);
/* The new defn must not be inline. */
if (DECL_BUILT_IN (olddecl))
{
- /* Get rid of any built-in function if new arg types don't match it
- or if we have a function definition. */
- if (! types_match || new_is_definition)
- {
- if (! different_binding_level)
- {
- TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
- DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
- }
- }
- else
- {
- /* If redeclaring a builtin function, and not a definition,
- it stays built in. */
- DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
- DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
- }
+ /* If redeclaring a builtin function, it stays built in.
+ But it gets tagged as having been declared. */
+ DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
+ DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
+ C_DECL_DECLARED_BUILTIN (newdecl) = 1;
}
/* Also preserve various other info from the definition. */
- if (! new_is_definition)
+ if (!new_is_definition)
{
DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
- /* When called with different_binding_level set, don't copy over
- DECL_INITIAL, so that we don't accidentally change function
- declarations into function definitions. */
- if (! different_binding_level)
- DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
- DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
+ DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
+ DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
- DECL_ESTIMATED_INSNS (newdecl) = DECL_ESTIMATED_INSNS (olddecl);
DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
/* Set DECL_INLINE on the declaration if we've got a body
from which to instantiate. */
- if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
+ if (DECL_INLINE (olddecl) && !DECL_UNINLINABLE (newdecl))
{
DECL_INLINE (newdecl) = 1;
DECL_ABSTRACT_ORIGIN (newdecl)
- = (different_binding_level
- ? DECL_ORIGIN (olddecl)
- : DECL_ABSTRACT_ORIGIN (olddecl));
+ = DECL_ABSTRACT_ORIGIN (olddecl);
}
}
else
/* If a previous declaration said inline, mark the
definition as inlinable. */
if (DECL_DECLARED_INLINE_P (newdecl)
- && ! DECL_UNINLINABLE (newdecl))
+ && !DECL_UNINLINABLE (newdecl))
DECL_INLINE (newdecl) = 1;
}
}
- if (different_binding_level)
- return 0;
/* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
- But preserve OLDDECL's DECL_UID. */
+ But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
{
unsigned olddecl_uid = DECL_UID (olddecl);
+ tree olddecl_context = DECL_CONTEXT (olddecl);
memcpy ((char *) olddecl + sizeof (struct tree_common),
(char *) newdecl + sizeof (struct tree_common),
sizeof (struct tree_decl) - sizeof (struct tree_common));
DECL_UID (olddecl) = olddecl_uid;
+ DECL_CONTEXT (olddecl) = olddecl_context;
}
- /* NEWDECL contains the merged attribute lists.
- Update OLDDECL to be the same. */
- DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
-
/* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
so that encode_section_info has a chance to look at the new decl
flags and attributes. */
&& (TREE_CODE (olddecl) == FUNCTION_DECL
|| (TREE_CODE (olddecl) == VAR_DECL
&& TREE_STATIC (olddecl))))
- make_decl_rtl (olddecl, NULL);
-
- return 1;
+ make_decl_rtl (olddecl);
}
-/* Return any external DECL associated with ID, whether or not it is
- currently in scope. */
+/* Handle when a new declaration NEWDECL has the same name as an old
+ one OLDDECL in the same binding contour. Prints an error message
+ if appropriate.
-static tree
-any_external_decl (tree id)
-{
- tree decl = IDENTIFIER_SYMBOL_VALUE (id);
- tree t;
-
- if (decl == 0 || TREE_CODE (decl) == ERROR_MARK)
- return 0;
- else if (TREE_CODE (decl) != TYPE_DECL && DECL_EXTERNAL (decl))
- return decl;
-
- t = purpose_member (id, truly_local_externals);
- if (t)
- return TREE_VALUE (t);
-
- return 0;
-}
+ If safely possible, alter OLDDECL to look like NEWDECL, and return
+ true. Otherwise, return false. */
-/* Record an external decl DECL. This only does something if a
- shadowing decl already exists. */
-static void
-record_external_decl (tree decl)
+static bool
+duplicate_decls (tree newdecl, tree olddecl)
{
- tree name = DECL_NAME (decl);
- if (!IDENTIFIER_SYMBOL_VALUE (name))
- return;
+ tree newtype = NULL, oldtype = NULL;
+
+ if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
+ return false;
- truly_local_externals = tree_cons (name, decl, truly_local_externals);
+ merge_decls (newdecl, olddecl, newtype, oldtype);
+ return true;
}
-/* Check whether decl-node X shadows an existing declaration.
- OLD is the old IDENTIFIER_SYMBOL_VALUE of the DECL_NAME of X,
- which might be a NULL_TREE. */
+\f
+/* Check whether decl-node NEW_DECL shadows an existing declaration. */
static void
-warn_if_shadowing (tree x, tree old)
+warn_if_shadowing (tree new_decl)
{
- const char *name;
+ struct c_binding *b;
- /* Nothing to shadow? */
- if (old == 0
- /* Shadow warnings not wanted? */
- || !warn_shadow
+ /* Shadow warnings wanted? */
+ if (!warn_shadow
/* No shadow warnings for internally generated vars. */
- || DECL_SOURCE_LINE (x) == 0
+ || DECL_IS_BUILTIN (new_decl)
/* No shadow warnings for vars made for inlining. */
- || DECL_FROM_INLINE (x)
+ || DECL_FROM_INLINE (new_decl)
/* Don't warn about the parm names in function declarator
- within a function declarator.
- It would be nice to avoid warning in any function
- declarator in a declaration, as opposed to a definition,
- but there is no way to tell it's not a definition. */
- || (TREE_CODE (x) == PARM_DECL
- && current_binding_level->level_chain->parm_flag))
+ within a function declarator. It would be nice to avoid
+ warning in any function declarator in a declaration, as
+ opposed to a definition, but there is no way to tell
+ it's not a definition at this point. */
+ || (TREE_CODE (new_decl) == PARM_DECL && current_scope->outer->parm_flag))
return;
- name = IDENTIFIER_POINTER (DECL_NAME (x));
+ /* Is anything being shadowed? Invisible decls do not count. */
+ for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
+ if (b->decl && b->decl != new_decl && !b->invisible)
+ {
+ tree old_decl = b->decl;
+
+ if (TREE_CODE (old_decl) == PARM_DECL)
+ warning ("%Jdeclaration of %qD shadows a parameter",
+ new_decl, new_decl);
+ else if (DECL_FILE_SCOPE_P (old_decl))
+ warning ("%Jdeclaration of %qD shadows a global declaration",
+ new_decl, new_decl);
+ else if (TREE_CODE (old_decl) == FUNCTION_DECL
+ && DECL_BUILT_IN (old_decl))
+ warning ("%Jdeclaration of %qD shadows a built-in function",
+ new_decl, new_decl);
+ else
+ warning ("%Jdeclaration of %qD shadows a previous local",
+ new_decl, new_decl);
- if (TREE_CODE (old) == PARM_DECL)
- shadow_warning (SW_PARAM, name, old);
- else if (C_DECL_FILE_SCOPE (old))
- shadow_warning (SW_GLOBAL, name, old);
- else
- shadow_warning (SW_LOCAL, name, old);
+ if (TREE_CODE (old_decl) != FUNCTION_DECL
+ || !DECL_BUILT_IN (old_decl))
+ warning ("%Jshadowed declaration is here", old_decl);
+
+ break;
+ }
}
static void
clone_underlying_type (tree x)
{
- if (DECL_SOURCE_LINE (x) == 0)
+ if (DECL_IS_BUILTIN (x))
{
if (TYPE_NAME (TREE_TYPE (x)) == 0)
TYPE_NAME (TREE_TYPE (x)) = x;
{
tree tt = TREE_TYPE (x);
DECL_ORIGINAL_TYPE (x) = tt;
- tt = build_type_copy (tt);
+ tt = build_variant_type_copy (tt);
TYPE_NAME (tt) = x;
TREE_USED (tt) = TREE_USED (x);
TREE_TYPE (x) = tt;
pushdecl (tree x)
{
tree name = DECL_NAME (x);
- struct binding_level *scope = current_binding_level;
-
-#ifdef ENABLE_CHECKING
- if (error_mark_node == 0)
- /* Called too early. */
- abort ();
-#endif
+ struct c_scope *scope = current_scope;
+ struct c_binding *b;
+ bool nested = false;
/* Functions need the lang_decl data. */
- if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
- DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
- ggc_alloc_cleared (sizeof (struct lang_decl));
-
- /* A local extern declaration for a function doesn't constitute nesting.
- A local auto declaration does, since it's a forward decl
- for a nested function coming later. */
- if (current_function_decl == NULL
- || ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
- && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x)))
- DECL_CONTEXT (x) = current_file_decl;
- else
+ if (TREE_CODE (x) == FUNCTION_DECL && !DECL_LANG_SPECIFIC (x))
+ DECL_LANG_SPECIFIC (x) = GGC_CNEW (struct lang_decl);
+
+ /* Must set DECL_CONTEXT for everything not at file scope or
+ DECL_FILE_SCOPE_P won't work. Local externs don't count
+ unless they have initializers (which generate code). */
+ if (current_function_decl
+ && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
+ || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
DECL_CONTEXT (x) = current_function_decl;
-
- if (name)
+
+ /* Anonymous decls are just inserted in the scope. */
+ if (!name)
{
- tree old;
+ bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
+ return x;
+ }
+
+ /* First, see if there is another declaration with the same name in
+ the current scope. If there is, duplicate_decls may do all the
+ work for us. If duplicate_decls returns false, that indicates
+ two incompatible decls in the same scope; we are to silently
+ replace the old one (duplicate_decls has issued all appropriate
+ diagnostics). In particular, we should not consider possible
+ duplicates in the external scope, or shadowing. */
+ b = I_SYMBOL_BINDING (name);
+ if (b && B_IN_SCOPE (b, scope))
+ {
+ if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
+ && COMPLETE_TYPE_P (TREE_TYPE (x)))
+ b->inner_comp = false;
+ if (duplicate_decls (x, b->decl))
+ return b->decl;
+ else
+ goto skip_external_and_shadow_checks;
+ }
+ /* All declarations with external linkage, and all external
+ references, go in the external scope, no matter what scope is
+ current. However, the binding in that scope is ignored for
+ purposes of normal name lookup. A separate binding structure is
+ created in the requested scope; this governs the normal
+ visibility of the symbol.
+
+ The binding in the externals scope is used exclusively for
+ detecting duplicate declarations of the same object, no matter
+ what scope they are in; this is what we do here. (C99 6.2.7p2:
+ All declarations that refer to the same object or function shall
+ have compatible type; otherwise, the behavior is undefined.) */
+ if (DECL_EXTERNAL (x) || scope == file_scope)
+ {
+ tree type = TREE_TYPE (x);
+ tree vistype = 0;
+ tree visdecl = 0;
+ bool type_saved = false;
+ if (b && !B_IN_EXTERNAL_SCOPE (b)
+ && (TREE_CODE (b->decl) == FUNCTION_DECL
+ || TREE_CODE (b->decl) == VAR_DECL)
+ && DECL_FILE_SCOPE_P (b->decl))
+ {
+ visdecl = b->decl;
+ vistype = TREE_TYPE (visdecl);
+ }
if (warn_nested_externs
- && scope != global_binding_level
- && DECL_EXTERNAL (x)
+ && scope != file_scope
&& !DECL_IN_SYSTEM_HEADER (x))
- warning ("nested extern declaration of `%s'",
- IDENTIFIER_POINTER (name));
+ warning ("nested extern declaration of %qD", x);
- old = lookup_name_current_level (name);
- if (old && duplicate_decls (x, old, 0, false))
- return old;
- if (DECL_EXTERNAL (x) || scope == global_binding_level)
+ while (b && !B_IN_EXTERNAL_SCOPE (b))
{
- /* Find and check against a previous, not-in-scope, external
- decl for this identifier. (C99 s???: If two declarations
- with external linkage, referring to the same object, have
- incompatible types, the behavior is undefined). */
- tree ext = any_external_decl (name);
- if (ext)
+ /* If this decl might be modified, save its type. This is
+ done here rather than when the decl is first bound
+ because the type may change after first binding, through
+ being completed or through attributes being added. If we
+ encounter multiple such decls, only the first should have
+ its type saved; the others will already have had their
+ proper types saved and the types will not have changed as
+ their scopes will not have been re-entered. */
+ if (DECL_FILE_SCOPE_P (b->decl) && !type_saved)
{
- if (duplicate_decls (x, ext, scope != global_binding_level,
- false))
- x = copy_node (ext);
+ b->type = TREE_TYPE (b->decl);
+ type_saved = true;
}
- else
- record_external_decl (x);
+ if (B_IN_FILE_SCOPE (b)
+ && TREE_CODE (b->decl) == VAR_DECL
+ && TREE_STATIC (b->decl)
+ && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
+ && !TYPE_DOMAIN (TREE_TYPE (b->decl))
+ && TREE_CODE (type) == ARRAY_TYPE
+ && TYPE_DOMAIN (type)
+ && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
+ && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
+ {
+ /* Array type completed in inner scope, which should be
+ diagnosed if the completion does not have size 1 and
+ it does not get completed in the file scope. */
+ b->inner_comp = true;
+ }
+ b = b->shadowed;
}
- if (TREE_CODE (x) == TYPE_DECL)
- clone_underlying_type (x);
-
- /* If storing a local value, there may already be one
- (inherited). If so, record it for restoration when this
- binding level ends. Take care not to do this if we are
- replacing an older decl in the same binding level (i.e.
- duplicate_decls returned false, above). */
- if (scope != global_binding_level
- && IDENTIFIER_SYMBOL_VALUE (name)
- && IDENTIFIER_SYMBOL_VALUE (name) != old)
+ /* If a matching external declaration has been found, set its
+ type to the composite of all the types of that declaration.
+ After the consistency checks, it will be reset to the
+ composite of the visible types only. */
+ if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
+ && b->type)
+ TREE_TYPE (b->decl) = b->type;
+
+ /* The point of the same_translation_unit_p check here is,
+ we want to detect a duplicate decl for a construct like
+ foo() { extern bar(); } ... static bar(); but not if
+ they are in different translation units. In any case,
+ the static does not go in the externals scope. */
+ if (b
+ && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
+ && duplicate_decls (x, b->decl))
+ {
+ tree thistype;
+ thistype = (vistype ? composite_type (vistype, type) : type);
+ b->type = TREE_TYPE (b->decl);
+ if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
+ thistype
+ = build_type_attribute_variant (thistype,
+ TYPE_ATTRIBUTES (b->type));
+ TREE_TYPE (b->decl) = thistype;
+ bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
+ return b->decl;
+ }
+ else if (TREE_PUBLIC (x))
{
- warn_if_shadowing (x, IDENTIFIER_SYMBOL_VALUE (name));
- scope->shadowed = tree_cons (name, IDENTIFIER_SYMBOL_VALUE (name),
- scope->shadowed);
+ if (visdecl && !b && duplicate_decls (x, visdecl))
+ {
+ /* An external declaration at block scope referring to a
+ visible entity with internal linkage. The composite
+ type will already be correct for this scope, so we
+ just need to fall through to make the declaration in
+ this scope. */
+ nested = true;
+ x = visdecl;
+ }
+ else
+ {
+ bind (name, x, external_scope, /*invisible=*/true,
+ /*nested=*/false);
+ nested = true;
+ }
}
+ }
+ /* Similarly, a declaration of a function with static linkage at
+ block scope must be checked against any existing declaration
+ of that function at file scope. */
+ else if (TREE_CODE (x) == FUNCTION_DECL && scope != file_scope
+ && !TREE_PUBLIC (x) && !DECL_INITIAL (x))
+ {
+ if (warn_nested_externs && !DECL_IN_SYSTEM_HEADER (x))
+ warning ("nested static declaration of %qD", x);
- /* Install the new declaration in the requested binding level. */
- IDENTIFIER_SYMBOL_VALUE (name) = x;
- C_DECL_INVISIBLE (x) = 0;
+ while (b && !B_IN_FILE_SCOPE (b))
+ b = b->shadowed;
- /* Keep list of variables in this level with incomplete type.
- If the input is erroneous, we can have error_mark in the type
- slot (e.g. "f(void a, ...)") - that doesn't count as an
- incomplete type. */
- if (TREE_TYPE (x) != error_mark_node
- && !COMPLETE_TYPE_P (TREE_TYPE (x)))
+ if (b && same_translation_unit_p (x, b->decl)
+ && duplicate_decls (x, b->decl))
{
- tree element = TREE_TYPE (x);
-
- while (TREE_CODE (element) == ARRAY_TYPE)
- element = TREE_TYPE (element);
- if (TREE_CODE (element) == RECORD_TYPE
- || TREE_CODE (element) == UNION_TYPE)
- scope->incomplete_list = tree_cons (NULL_TREE, x,
- scope->incomplete_list);
+ bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
+ return b->decl;
+ }
+ else
+ {
+ bind (name, x, file_scope, /*invisible=*/true, /*nested=*/false);
+ nested = true;
}
}
- /* Put decls on list in reverse order.
- We will reverse them later if necessary. */
- TREE_CHAIN (x) = scope->names;
- scope->names = x;
+ warn_if_shadowing (x);
+
+ skip_external_and_shadow_checks:
+ if (TREE_CODE (x) == TYPE_DECL)
+ clone_underlying_type (x);
+
+ bind (name, x, scope, /*invisible=*/false, nested);
+
+ /* If x's type is incomplete because it's based on a
+ structure or union which has not yet been fully declared,
+ attach it to that structure or union type, so we can go
+ back and complete the variable declaration later, if the
+ structure or union gets fully declared.
+
+ If the input is erroneous, we can have error_mark in the type
+ slot (e.g. "f(void a, ...)") - that doesn't count as an
+ incomplete type. */
+ if (TREE_TYPE (x) != error_mark_node
+ && !COMPLETE_TYPE_P (TREE_TYPE (x)))
+ {
+ tree element = TREE_TYPE (x);
+
+ while (TREE_CODE (element) == ARRAY_TYPE)
+ element = TREE_TYPE (element);
+ element = TYPE_MAIN_VARIANT (element);
+ if ((TREE_CODE (element) == RECORD_TYPE
+ || TREE_CODE (element) == UNION_TYPE)
+ && (TREE_CODE (x) != TYPE_DECL
+ || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
+ && !COMPLETE_TYPE_P (element))
+ C_TYPE_INCOMPLETE_VARS (element)
+ = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
+ }
return x;
}
-/* Record X as belonging to the global scope (C99 "file scope").
+/* Record X as belonging to file scope.
This is used only internally by the Objective-C front end,
- and is limited to its needs. It will hork if there is _any_
- visible binding for X (not just a global one). */
+ and is limited to its needs. duplicate_decls is not called;
+ if there is any preexisting decl for this identifier, it is an ICE. */
+
tree
pushdecl_top_level (tree x)
{
- tree name, old;
+ tree name;
+ bool nested = false;
- if (TREE_CODE (x) != VAR_DECL)
- abort ();
+ gcc_assert (TREE_CODE (x) == VAR_DECL);
name = DECL_NAME (x);
- old = IDENTIFIER_SYMBOL_VALUE (name);
-
- if (old)
- {
- if (DECL_CONTEXT (old))
- abort ();
- if (!duplicate_decls (x, old, 0, false))
- abort ();
+ gcc_assert (!I_SYMBOL_BINDING (name));
- return old;
+ if (TREE_PUBLIC (x))
+ {
+ bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
+ nested = true;
}
+ if (file_scope)
+ bind (name, x, file_scope, /*invisible=*/false, nested);
- DECL_CONTEXT (x) = current_file_decl;
- IDENTIFIER_SYMBOL_VALUE (name) = x;
- TREE_CHAIN (x) = global_binding_level->names;
- global_binding_level->names = x;
return x;
}
-
-/* Record X as belonging to the outermost scope of the current
- function. This is used only internally, by c_make_fname_decl and
- undeclared_variable, and is limited to their needs. The NAME is
- provided as a separate argument because undeclared_variable wants to
- use error_mark_node for X. For VAR_DECLs, duplicate_decls is not
- called; if there is any preexisting decl for this identifier, it is
- an ICE. */
+\f
static void
-pushdecl_function_level (tree x, tree name)
+implicit_decl_warning (tree id, tree olddecl)
{
- struct binding_level *scope;
-
- scope = current_binding_level;
- while (scope->function_body == 0)
- scope = scope->level_chain;
- if (!scope)
- abort ();
-
- if (x == error_mark_node)
- scope->shadowed = tree_cons (name, IDENTIFIER_SYMBOL_VALUE (name),
- scope->shadowed);
- else if (TREE_CODE (x) == VAR_DECL)
+ void (*diag) (const char *, ...);
+ switch (mesg_implicit_function_declaration)
{
- if (name != DECL_NAME (x))
- abort ();
- if (IDENTIFIER_SYMBOL_VALUE (name))
- abort ();
-
- DECL_CONTEXT (x) = current_function_decl;
- TREE_CHAIN (x) = scope->names;
- scope->names = x;
+ case 0: return;
+ case 1: diag = warning; break;
+ case 2: diag = error; break;
+ default: gcc_unreachable ();
}
- IDENTIFIER_SYMBOL_VALUE (name) = x;
+ diag (N_("implicit declaration of function %qE"), id);
+ if (olddecl)
+ locate_old_decl (olddecl, diag);
}
-\f
+
/* Generate an implicit declaration for identifier FUNCTIONID as a
function of type int (). */
tree
implicitly_declare (tree functionid)
{
- tree decl = any_external_decl (functionid);
+ struct c_binding *b;
+ tree decl = 0;
+ tree asmspec_tree;
+
+ for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
+ {
+ if (B_IN_SCOPE (b, external_scope))
+ {
+ decl = b->decl;
+ break;
+ }
+ }
- if (decl && decl != error_mark_node)
+ if (decl)
{
- /* Implicit declaration of a function already declared
- (somehow) in a different scope, or as a built-in.
- If this is the first time this has happened, warn;
- then recycle the old declaration. */
- if (!C_DECL_IMPLICIT (decl))
+ /* FIXME: Objective-C has weird not-really-builtin functions
+ which are supposed to be visible automatically. They wind up
+ in the external scope because they're pushed before the file
+ scope gets created. Catch this here and rebind them into the
+ file scope. */
+ if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
{
- implicit_decl_warning (DECL_NAME (decl));
- if (! C_DECL_FILE_SCOPE (decl))
- warning_with_decl (decl, "previous declaration of `%s'");
- C_DECL_IMPLICIT (decl) = 1;
+ bind (functionid, decl, file_scope,
+ /*invisible=*/false, /*nested=*/true);
+ return decl;
+ }
+ else
+ {
+ tree newtype = default_function_type;
+ if (b->type)
+ TREE_TYPE (decl) = b->type;
+ /* Implicit declaration of a function already declared
+ (somehow) in a different scope, or as a built-in.
+ If this is the first time this has happened, warn;
+ then recycle the old declaration but with the new type. */
+ if (!C_DECL_IMPLICIT (decl))
+ {
+ implicit_decl_warning (functionid, decl);
+ C_DECL_IMPLICIT (decl) = 1;
+ }
+ if (DECL_BUILT_IN (decl))
+ {
+ newtype = build_type_attribute_variant (newtype,
+ TYPE_ATTRIBUTES
+ (TREE_TYPE (decl)));
+ if (!comptypes (newtype, TREE_TYPE (decl)))
+ {
+ warning ("incompatible implicit declaration of built-in"
+ " function %qD", decl);
+ newtype = TREE_TYPE (decl);
+ }
+ }
+ else
+ {
+ if (!comptypes (newtype, TREE_TYPE (decl)))
+ {
+ error ("incompatible implicit declaration of function %qD",
+ decl);
+ locate_old_decl (decl, error);
+ }
+ }
+ b->type = TREE_TYPE (decl);
+ TREE_TYPE (decl) = newtype;
+ bind (functionid, decl, current_scope,
+ /*invisible=*/false, /*nested=*/true);
+ return decl;
}
- /* If this function is global, then it must already be in the
- global binding level, so there's no need to push it again. */
- if (current_binding_level == global_binding_level)
- return decl;
- /* If this is a local declaration, make a copy; we can't have
- the same DECL listed in two different binding levels. */
- return pushdecl (copy_node (decl));
}
/* Not seen before. */
DECL_EXTERNAL (decl) = 1;
TREE_PUBLIC (decl) = 1;
C_DECL_IMPLICIT (decl) = 1;
- implicit_decl_warning (functionid);
+ implicit_decl_warning (functionid, 0);
+ asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
+ if (asmspec_tree)
+ set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
- /* ANSI standard says implicit declarations are in the innermost block.
+ /* C89 says implicit declarations are in the innermost block.
So we record the decl in the standard fashion. */
decl = pushdecl (decl);
/* No need to call objc_check_decl here - it's a function type. */
- rest_of_decl_compilation (decl, NULL, 0, 0);
-
- /* Write a record describing this implicit function declaration to the
- prototypes file (if requested). */
+ rest_of_decl_compilation (decl, 0, 0);
+ /* Write a record describing this implicit function declaration
+ to the prototypes file (if requested). */
gen_aux_info_record (decl, 0, 1, 0);
/* Possibly apply some default attributes to this implicit declaration. */
return decl;
}
-static void
-implicit_decl_warning (tree id)
-{
- const char *name = IDENTIFIER_POINTER (id);
- if (mesg_implicit_function_declaration == 2)
- error ("implicit declaration of function `%s'", name);
- else if (mesg_implicit_function_declaration == 1)
- warning ("implicit declaration of function `%s'", name);
-}
-
-/* Return zero if the declaration NEWDECL is valid
- when the declaration OLDDECL (assumed to be for the same name)
- has already been seen.
- Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
- and 3 if it is a conflicting declaration. */
-
-static int
-redeclaration_error_message (tree newdecl, tree olddecl)
-{
- if (TREE_CODE (newdecl) == TYPE_DECL)
- {
- /* Do not complain about type redeclarations where at least one
- declaration was in a system header. */
- if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
- return 0;
- return 1;
- }
- else if (TREE_CODE (newdecl) == FUNCTION_DECL)
- {
- /* Declarations of functions can insist on internal linkage
- but they can't be inconsistent with internal linkage,
- so there can be no error on that account.
- However defining the same name twice is no good. */
- if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
- /* However, defining once as extern inline and a second
- time in another way is ok. */
- && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
- && ! (DECL_DECLARED_INLINE_P (newdecl)
- && DECL_EXTERNAL (newdecl))))
- return 1;
- return 0;
- }
- else if (C_DECL_FILE_SCOPE (newdecl))
- {
- /* Objects declared at top level: */
- /* If at least one is a reference, it's ok. */
- if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
- return 0;
- /* Reject two definitions. */
- if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
- return 1;
- /* Now we have two tentative defs, or one tentative and one real def. */
- /* Insist that the linkage match. */
- if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
- return 3;
- return 0;
- }
- else if (current_binding_level->parm_flag
- && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
- return 0;
- else
- {
- /* Newdecl has block scope. If olddecl has block scope also, then
- reject two definitions, and reject a definition together with an
- external reference. Otherwise, it is OK, because newdecl must
- be an extern reference to olddecl. */
- if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
- && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
- return 2;
- return 0;
- }
-}
-
/* Issue an error message for a reference to an undeclared variable
ID, including a reference to a builtin outside of function-call
context. Establish a binding of the identifier to error_mark_node
undeclared_variable (tree id)
{
static bool already = false;
+ struct c_scope *scope;
if (current_function_decl == 0)
{
- error ("`%s' undeclared here (not in a function)",
- IDENTIFIER_POINTER (id));
- IDENTIFIER_SYMBOL_VALUE (id) = error_mark_node;
+ error ("%qE undeclared here (not in a function)", id);
+ scope = current_scope;
}
else
{
- error ("`%s' undeclared (first use in this function)",
- IDENTIFIER_POINTER (id));
+ error ("%qE undeclared (first use in this function)", id);
- if (! already)
+ if (!already)
{
error ("(Each undeclared identifier is reported only once");
error ("for each function it appears in.)");
already = true;
}
- pushdecl_function_level (error_mark_node, id);
+ /* If we are parsing old-style parameter decls, current_function_decl
+ will be nonnull but current_function_scope will be null. */
+ scope = current_function_scope ? current_function_scope : current_scope;
}
+ bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
}
\f
-/* Get the LABEL_DECL corresponding to identifier ID as a label.
+/* Subroutine of lookup_label, declare_label, define_label: construct a
+ LABEL_DECL with all the proper frills. */
+
+static tree
+make_label (tree name, location_t location)
+{
+ tree label = build_decl (LABEL_DECL, name, void_type_node);
+
+ DECL_CONTEXT (label) = current_function_decl;
+ DECL_MODE (label) = VOIDmode;
+ DECL_SOURCE_LOCATION (label) = location;
+
+ return label;
+}
+
+/* Get the LABEL_DECL corresponding to identifier NAME as a label.
Create one if none exists so far for the current function.
- This function is called for both label definitions and label references. */
+ This is called when a label is used in a goto expression or
+ has its address taken. */
tree
-lookup_label (tree id)
+lookup_label (tree name)
{
- tree decl = IDENTIFIER_LABEL_VALUE (id);
+ tree label;
if (current_function_decl == 0)
{
- error ("label %s referenced outside of any function",
- IDENTIFIER_POINTER (id));
+ error ("label %qs referenced outside of any function",
+ IDENTIFIER_POINTER (name));
return 0;
}
- /* Use a label already defined or ref'd with this name. */
- if (decl != 0)
- {
- /* But not if it is inherited and wasn't declared to be inheritable. */
- if (DECL_CONTEXT (decl) != current_function_decl
- && ! C_DECLARED_LABEL_FLAG (decl))
- return shadow_label (id);
- return decl;
+ /* Use a label already defined or ref'd with this name, but not if
+ it is inherited from a containing function and wasn't declared
+ using __label__. */
+ label = I_LABEL_DECL (name);
+ if (label && (DECL_CONTEXT (label) == current_function_decl
+ || C_DECLARED_LABEL_FLAG (label)))
+ {
+ /* If the label has only been declared, update its apparent
+ location to point here, for better diagnostics if it
+ turns out not to have been defined. */
+ if (!TREE_USED (label))
+ DECL_SOURCE_LOCATION (label) = input_location;
+ return label;
}
- decl = build_decl (LABEL_DECL, id, void_type_node);
-
- /* A label not explicitly declared must be local to where it's ref'd. */
- DECL_CONTEXT (decl) = current_function_decl;
-
- DECL_MODE (decl) = VOIDmode;
-
- /* Say where one reference is to the label,
- for the sake of the error if it is not defined. */
- DECL_SOURCE_LOCATION (decl) = input_location;
-
- IDENTIFIER_LABEL_VALUE (id) = decl;
+ /* No label binding for that identifier; make one. */
+ label = make_label (name, input_location);
- named_labels = tree_cons (NULL_TREE, decl, named_labels);
-
- return decl;
+ /* Ordinary labels go in the current function scope. */
+ bind (name, label, current_function_scope,
+ /*invisible=*/false, /*nested=*/false);
+ return label;
}
-/* Make a label named NAME in the current function,
- shadowing silently any that may be inherited from containing functions
- or containing scopes.
-
- Note that valid use, if the label being shadowed
- comes from another scope in the same function,
- requires calling declare_nonlocal_label right away. */
+/* Make a label named NAME in the current function, shadowing silently
+ any that may be inherited from containing functions or containing
+ scopes. This is called for __label__ declarations. */
tree
-shadow_label (tree name)
+declare_label (tree name)
{
- tree decl = IDENTIFIER_LABEL_VALUE (name);
+ struct c_binding *b = I_LABEL_BINDING (name);
+ tree label;
- if (decl != 0)
+ /* Check to make sure that the label hasn't already been declared
+ at this scope */
+ if (b && B_IN_CURRENT_SCOPE (b))
{
- tree dup;
-
- /* Check to make sure that the label hasn't already been declared
- at this label scope */
- for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
- if (TREE_VALUE (dup) == decl)
- {
- error ("duplicate label declaration `%s'",
- IDENTIFIER_POINTER (name));
- error_with_decl (TREE_VALUE (dup),
- "this is a previous declaration");
- /* Just use the previous declaration. */
- return lookup_label (name);
- }
+ error ("duplicate label declaration %qs", IDENTIFIER_POINTER (name));
+ locate_old_decl (b->decl, error);
- shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
- IDENTIFIER_LABEL_VALUE (name) = decl = 0;
+ /* Just use the previous declaration. */
+ return b->decl;
}
- return lookup_label (name);
+ label = make_label (name, input_location);
+ C_DECLARED_LABEL_FLAG (label) = 1;
+
+ /* Declared labels go in the current scope. */
+ bind (name, label, current_scope,
+ /*invisible=*/false, /*nested=*/false);
+ return label;
}
/* Define a label, specifying the location in the source file.
tree
define_label (location_t location, tree name)
{
- tree decl = lookup_label (name);
-
- /* If label with this name is known from an outer context, shadow it. */
- if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
- {
- shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
- IDENTIFIER_LABEL_VALUE (name) = 0;
- decl = lookup_label (name);
+ /* Find any preexisting label with this name. It is an error
+ if that label has already been defined in this function, or
+ if there is a containing function with a declared label with
+ the same name. */
+ tree label = I_LABEL_DECL (name);
+
+ if (label
+ && ((DECL_CONTEXT (label) == current_function_decl
+ && DECL_INITIAL (label) != 0)
+ || (DECL_CONTEXT (label) != current_function_decl
+ && C_DECLARED_LABEL_FLAG (label))))
+ {
+ error ("%Hduplicate label %qD", &location, label);
+ locate_old_decl (label, error);
+ return 0;
}
-
- if (warn_traditional && !in_system_header && lookup_name (name))
- warning ("%Htraditional C lacks a separate namespace for labels, "
- "identifier `%s' conflicts", &location, IDENTIFIER_POINTER (name));
-
- if (DECL_INITIAL (decl) != 0)
+ else if (label && DECL_CONTEXT (label) == current_function_decl)
{
- error ("%Hduplicate label `%s'", &location, IDENTIFIER_POINTER (name));
- return 0;
+ /* The label has been used or declared already in this function,
+ but not defined. Update its location to point to this
+ definition. */
+ DECL_SOURCE_LOCATION (label) = location;
}
else
{
- /* Mark label as having been defined. */
- DECL_INITIAL (decl) = error_mark_node;
- /* Say where in the source. */
- DECL_SOURCE_LOCATION (decl) = location;
- return decl;
- }
-}
-\f
-/* Return the list of declarations of the current level.
- Note that this list is in reverse order unless/until
- you nreverse it; and when you do nreverse it, you must
- store the result back using `storedecls' or you will lose. */
-
-tree
-getdecls (void)
-{
- return current_binding_level->names;
-}
-
-/* Return the list of type-tags (for structs, etc) of the current level. */
-
-tree
-gettags (void)
-{
- return current_binding_level->tags;
-}
+ /* No label binding for that identifier; make one. */
+ label = make_label (name, location);
-/* Store the list of declarations of the current level.
- This is done for the parameter declarations of a function being defined,
- after they are modified in the light of any missing parameters. */
-
-static void
-storedecls (tree decls)
-{
- current_binding_level->names = decls;
-}
+ /* Ordinary labels go in the current function scope. */
+ bind (name, label, current_function_scope,
+ /*invisible=*/false, /*nested=*/false);
+ }
-/* Similarly, store the list of tags of the current level. */
+ if (warn_traditional && !in_system_header && lookup_name (name))
+ warning ("%Htraditional C lacks a separate namespace for labels, "
+ "identifier %qs conflicts", &location,
+ IDENTIFIER_POINTER (name));
-static void
-storetags (tree tags)
-{
- current_binding_level->tags = tags;
+ /* Mark label as having been defined. */
+ DECL_INITIAL (label) = error_mark_node;
+ return label;
}
\f
/* Given NAME, an IDENTIFIER_NODE,
return the structure (or union or enum) definition for that name.
- If THISLEVEL_ONLY is nonzero, searches only the current_binding_level.
+ If THISLEVEL_ONLY is nonzero, searches only the current_scope.
CODE says which kind of type the caller wants;
it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
If the wrong kind of type is found, an error is reported. */
static tree
lookup_tag (enum tree_code code, tree name, int thislevel_only)
{
- tree tag = IDENTIFIER_TAG_VALUE (name);
+ struct c_binding *b = I_TAG_BINDING (name);
int thislevel = 0;
- if (!tag)
+ if (!b || !b->decl)
return 0;
/* We only care about whether it's in this level if
thislevel_only was set or it might be a type clash. */
- if (thislevel_only || TREE_CODE (tag) != code)
- {
- if (current_binding_level == global_binding_level
- || purpose_member (name, current_binding_level->tags))
+ if (thislevel_only || TREE_CODE (b->decl) != code)
+ {
+ /* For our purposes, a tag in the external scope is the same as
+ a tag in the file scope. (Primarily relevant to Objective-C
+ and its builtin structure tags, which get pushed before the
+ file scope is created.) */
+ if (B_IN_CURRENT_SCOPE (b)
+ || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
thislevel = 1;
}
if (thislevel_only && !thislevel)
return 0;
- if (TREE_CODE (tag) != code)
+ if (TREE_CODE (b->decl) != code)
{
/* Definition isn't the kind we were looking for. */
pending_invalid_xref = name;
if (thislevel)
pending_xref_error ();
}
- return tag;
+ return b->decl;
}
/* Print an error message now
pending_xref_error (void)
{
if (pending_invalid_xref != 0)
- error ("%H`%s' defined as wrong kind of tag",
+ error ("%H%qs defined as wrong kind of tag",
&pending_invalid_xref_location,
IDENTIFIER_POINTER (pending_invalid_xref));
pending_invalid_xref = 0;
}
\f
-/* Look up NAME in the current binding level and its superiors
+/* Look up NAME in the current scope and its superiors
in the namespace of variables, functions and typedefs.
Return a ..._DECL node of some kind representing its definition,
or return 0 if it is undefined. */
tree
lookup_name (tree name)
{
- tree decl = IDENTIFIER_SYMBOL_VALUE (name);
- if (decl == 0 || decl == error_mark_node)
- return decl;
- if (C_DECL_INVISIBLE (decl))
- return 0;
- return decl;
+ struct c_binding *b = I_SYMBOL_BINDING (name);
+ if (b && !b->invisible)
+ return b->decl;
+ return 0;
}
-/* Similar to `lookup_name' but look only at the current binding level. */
+/* Similar to `lookup_name' but look only at the indicated scope. */
static tree
-lookup_name_current_level (tree name)
+lookup_name_in_scope (tree name, struct c_scope *scope)
{
- tree decl = IDENTIFIER_SYMBOL_VALUE (name);
-
- if (decl == 0 || decl == error_mark_node || C_DECL_INVISIBLE (decl))
- return 0;
-
- if (current_binding_level == global_binding_level)
- return decl;
-
- /* Scan the current scope for a decl with name NAME. */
- if (chain_member (decl, current_binding_level->names))
- return decl;
+ struct c_binding *b;
+ for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
+ if (B_IN_SCOPE (b, scope))
+ return b->decl;
return 0;
}
\f
/* Create the predefined scalar types of C,
and some nodes representing standard constants (0, 1, (void *) 0).
- Initialize the global binding level.
+ Initialize the global scope.
Make definitions for built-in primitive functions. */
void
tree endlink;
tree ptr_ftype_void, ptr_ftype_ptr;
location_t save_loc = input_location;
-
+
/* Adds some ggc roots, and reserved words for c-parse.in. */
c_parse_init ();
- current_function_decl = NULL;
- named_labels = NULL;
- current_binding_level = NULL_BINDING_LEVEL;
- free_binding_level = NULL_BINDING_LEVEL;
+ current_function_decl = 0;
+
+ gcc_obstack_init (&parser_obstack);
+
+ /* Make the externals scope. */
+ push_scope ();
+ external_scope = current_scope;
- /* Make the binding_level structure for global names. */
- pushlevel (0);
- global_binding_level = current_binding_level;
/* Declarations from c_common_nodes_and_builtins must not be associated
with this input file, lest we get differences between using and not
using preprocessed headers. */
- input_location.file = "<internal>";
+#ifdef USE_MAPPED_LOCATION
+ input_location = BUILTINS_LOCATION;
+#else
+ input_location.file = "<built-in>";
input_location.line = 0;
+#endif
- /* Make the DECL for the toplevel file scope. */
- current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
-
- build_common_tree_nodes (flag_signed_char);
+ build_common_tree_nodes (flag_signed_char, false);
c_common_nodes_and_builtins ();
- boolean_type_node = integer_type_node;
- boolean_true_node = integer_one_node;
- boolean_false_node = integer_zero_node;
+ /* In C, comparisons and TRUTH_* expressions have type int. */
+ truthvalue_type_node = integer_type_node;
+ truthvalue_true_node = integer_one_node;
+ truthvalue_false_node = integer_zero_node;
- c_bool_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
- TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
- TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
- TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
- TYPE_PRECISION (c_bool_type_node) = 1;
+ /* Even in C99, which has a real boolean type. */
pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
- c_bool_type_node));
- c_bool_false_node = build_int_2 (0, 0);
- TREE_TYPE (c_bool_false_node) = c_bool_type_node;
- c_bool_true_node = build_int_2 (1, 0);
- TREE_TYPE (c_bool_true_node) = c_bool_type_node;
+ boolean_type_node));
endlink = void_list_node;
ptr_ftype_void = build_function_type (ptr_type_node, endlink);
input_location = save_loc;
- pedantic_lvalues = pedantic;
+ pedantic_lvalues = true;
make_fname_decl = c_make_fname_decl;
start_fname_decls ();
-
- builtin_decls = global_binding_level->names;
}
/* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
NAME depended on the type of the function. As we don't yet implement
delayed emission of static data, we mark the decl as emitted
so it is not placed in the output. Anything using it must therefore pull
- out the STRING_CST initializer directly. This does mean that these names
- are string merging candidates, which is wrong for C99's __func__. FIXME. */
+ out the STRING_CST initializer directly. FIXME. */
static tree
c_make_fname_decl (tree id, int type_dep)
DECL_ARTIFICIAL (decl) = 1;
init = build_string (length + 1, name);
+ free ((char *) name);
TREE_TYPE (init) = type;
DECL_INITIAL (decl) = init;
TREE_USED (decl) = 1;
if (current_function_decl)
- pushdecl_function_level (decl, DECL_NAME (decl));
+ {
+ DECL_CONTEXT (decl) = current_function_decl;
+ bind (id, decl, current_function_scope,
+ /*invisible=*/false, /*nested=*/false);
+ }
finish_decl (decl, init, NULL_TREE);
tree
builtin_function (const char *name, tree type, int function_code,
- enum built_in_class class, const char *library_name,
+ enum built_in_class cl, const char *library_name,
tree attrs)
{
- tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
- DECL_EXTERNAL (decl) = 1;
+ tree id = get_identifier (name);
+ tree decl = build_decl (FUNCTION_DECL, id, type);
TREE_PUBLIC (decl) = 1;
+ DECL_EXTERNAL (decl) = 1;
+ DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
+ DECL_BUILT_IN_CLASS (decl) = cl;
+ DECL_FUNCTION_CODE (decl) = function_code;
if (library_name)
SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
- make_decl_rtl (decl, NULL);
- pushdecl (decl);
- DECL_BUILT_IN_CLASS (decl) = class;
- DECL_FUNCTION_CODE (decl) = function_code;
- /* Warn if a function in the namespace for users
- is used without an occasion to consider it declared. */
- if (name[0] != '_' || name[1] != '_')
- C_DECL_INVISIBLE (decl) = 1;
+ /* Should never be called on a symbol with a preexisting meaning. */
+ gcc_assert (!I_SYMBOL_BINDING (id));
+
+ bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
+
+ /* Builtins in the implementation namespace are made visible without
+ needing to be explicitly declared. See push_file_scope. */
+ if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
+ {
+ TREE_CHAIN (decl) = visible_builtins;
+ visible_builtins = decl;
+ }
/* Possibly apply some default attributes to this built-in function. */
if (attrs)
return decl;
}
-
-/* Apply default attributes to a function, if a system function with default
- attributes. */
-
-void
-c_insert_default_attributes (tree decl)
-{
- if (!TREE_PUBLIC (decl))
- return;
- c_common_insert_default_attributes (decl);
-}
\f
/* Called when a declaration is seen that contains no names to declare.
If its type is a reference to a structure, union or enum inherited
Otherwise, it is an error. */
void
-shadow_tag (tree declspecs)
+shadow_tag (const struct c_declspecs *declspecs)
{
shadow_tag_warned (declspecs, 0);
}
+/* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
+ but no pedwarn. */
void
-shadow_tag_warned (tree declspecs, int warned)
-
-
- /* 1 => we have done a pedwarn. 2 => we have done a warning, but
- no pedwarn. */
+shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
{
- int found_tag = 0;
- tree link;
- tree specs, attrs;
+ bool found_tag = false;
pending_invalid_xref = 0;
- /* Remove the attributes from declspecs, since they will confuse the
- following code. */
- split_specs_attrs (declspecs, &specs, &attrs);
-
- for (link = specs; link; link = TREE_CHAIN (link))
+ if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
{
- tree value = TREE_VALUE (link);
+ tree value = declspecs->type;
enum tree_code code = TREE_CODE (value);
if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
tree name = TYPE_NAME (value);
tree t;
- found_tag++;
+ found_tag = true;
if (name == 0)
{
}
else
{
- if (!warned && ! in_system_header)
+ if (warned != 1 && !in_system_header)
{
- warning ("useless keyword or type name in empty declaration");
- warned = 2;
+ pedwarn ("useless type name in empty declaration");
+ warned = 1;
}
}
}
+ else if (warned != 1 && !in_system_header && declspecs->typedef_p)
+ {
+ pedwarn ("useless type name in empty declaration");
+ warned = 1;
+ }
+
+ if (declspecs->inline_p)
+ {
+ error ("%<inline%> in empty declaration");
+ warned = 1;
+ }
+
+ if (current_scope == file_scope && declspecs->storage_class == csc_auto)
+ {
+ error ("%<auto%> in file-scope empty declaration");
+ warned = 1;
+ }
+
+ if (current_scope == file_scope && declspecs->storage_class == csc_register)
+ {
+ error ("%<register%> in file-scope empty declaration");
+ warned = 1;
+ }
+
+ if (!warned && !in_system_header && declspecs->storage_class != csc_none)
+ {
+ warning ("useless storage class specifier in empty declaration");
+ warned = 2;
+ }
+
+ if (!warned && !in_system_header && declspecs->thread_p)
+ {
+ warning ("useless %<__thread%> in empty declaration");
+ warned = 2;
+ }
- if (found_tag > 1)
- error ("two types specified in one empty declaration");
+ if (!warned && !in_system_header && (declspecs->const_p
+ || declspecs->volatile_p
+ || declspecs->restrict_p))
+ {
+ warning ("useless type qualifier in empty declaration");
+ warned = 2;
+ }
if (warned != 1)
{
- if (found_tag == 0)
+ if (!found_tag)
pedwarn ("empty declaration");
}
}
\f
+
+/* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
+ bits. SPECS represents declaration specifiers that the grammar
+ only permits to contain type qualifiers and attributes. */
+
+int
+quals_from_declspecs (const struct c_declspecs *specs)
+{
+ int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
+ | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
+ | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
+ gcc_assert (!specs->type
+ && !specs->decl_attr
+ && specs->typespec_word == cts_none
+ && specs->storage_class == csc_none
+ && !specs->typedef_p
+ && !specs->explicit_signed_p
+ && !specs->deprecated_p
+ && !specs->long_p
+ && !specs->long_long_p
+ && !specs->short_p
+ && !specs->signed_p
+ && !specs->unsigned_p
+ && !specs->complex_p
+ && !specs->inline_p
+ && !specs->thread_p);
+ return quals;
+}
+
/* Construct an array declarator. EXPR is the expression inside [], or
NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
to the pointer to which a parameter array is converted). STATIC_P is
- nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
- is nonzero is the array is [*], a VLA of unspecified length which is
+ true if "static" is inside the [], false otherwise. VLA_UNSPEC_P
+ is true if the array is [*], a VLA of unspecified length which is
nevertheless a complete type (not currently implemented by GCC),
- zero otherwise. The declarator is constructed as an ARRAY_REF
- (to be decoded by grokdeclarator), whose operand 0 is what's on the
- left of the [] (filled by in set_array_declarator_type) and operand 1
- is the expression inside; whose TREE_TYPE is the type qualifiers and
- which has TREE_STATIC set if "static" is used. */
+ false otherwise. The field for the contained declarator is left to be
+ filled in by set_array_declarator_inner. */
-tree
-build_array_declarator (tree expr, tree quals, int static_p, int vla_unspec_p)
+struct c_declarator *
+build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
+ bool vla_unspec_p)
{
- tree decl;
- decl = build_nt (ARRAY_REF, NULL_TREE, expr);
- TREE_TYPE (decl) = quals;
- TREE_STATIC (decl) = (static_p ? 1 : 0);
+ struct c_declarator *declarator = XOBNEW (&parser_obstack,
+ struct c_declarator);
+ declarator->kind = cdk_array;
+ declarator->declarator = 0;
+ declarator->u.array.dimen = expr;
+ if (quals)
+ {
+ declarator->u.array.attrs = quals->attrs;
+ declarator->u.array.quals = quals_from_declspecs (quals);
+ }
+ else
+ {
+ declarator->u.array.attrs = NULL_TREE;
+ declarator->u.array.quals = 0;
+ }
+ declarator->u.array.static_p = static_p;
+ declarator->u.array.vla_unspec_p = vla_unspec_p;
if (pedantic && !flag_isoc99)
{
- if (static_p || quals != NULL_TREE)
- pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
+ if (static_p || quals != NULL)
+ pedwarn ("ISO C90 does not support %<static%> or type "
+ "qualifiers in parameter array declarators");
if (vla_unspec_p)
- pedwarn ("ISO C90 does not support `[*]' array declarators");
+ pedwarn ("ISO C90 does not support %<[*]%> array declarators");
}
if (vla_unspec_p)
- warning ("GCC does not yet properly implement `[*]' array declarators");
- return decl;
+ warning ("GCC does not yet properly implement %<[*]%> array declarators");
+ return declarator;
}
-/* Set the type of an array declarator. DECL is the declarator, as
- constructed by build_array_declarator; TYPE is what appears on the left
- of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
- abstract declarator, zero otherwise; this is used to reject static and
- type qualifiers in abstract declarators, where they are not in the
- C99 grammar. */
+/* Set the contained declarator of an array declarator. DECL is the
+ declarator, as constructed by build_array_declarator; INNER is what
+ appears on the left of the []. ABSTRACT_P is true if it is an
+ abstract declarator, false otherwise; this is used to reject static
+ and type qualifiers in abstract declarators, where they are not in
+ the C99 grammar (subject to possible change in DR#289). */
-tree
-set_array_declarator_type (tree decl, tree type, int abstract_p)
+struct c_declarator *
+set_array_declarator_inner (struct c_declarator *decl,
+ struct c_declarator *inner, bool abstract_p)
{
- TREE_OPERAND (decl, 0) = type;
- if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
+ decl->declarator = inner;
+ if (abstract_p && (decl->u.array.quals != TYPE_UNQUALIFIED
+ || decl->u.array.attrs != NULL_TREE
+ || decl->u.array.static_p))
error ("static or type qualifiers in abstract declarator");
return decl;
}
/* Decode a "typename", such as "int **", returning a ..._TYPE node. */
tree
-groktypename (tree typename)
+groktypename (struct c_type_name *type_name)
{
- tree specs, attrs;
-
- if (TREE_CODE (typename) != TREE_LIST)
- return typename;
+ tree type;
+ tree attrs = type_name->specs->attrs;
- split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
+ type_name->specs->attrs = NULL_TREE;
- typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
+ type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
+ false, NULL);
/* Apply attributes. */
- decl_attributes (&typename, attrs, 0);
-
- return typename;
-}
+ decl_attributes (&type, attrs, 0);
-/* Return a PARM_DECL node for a given pair of specs and declarator. */
-
-tree
-groktypename_in_parm_context (tree typename)
-{
- if (TREE_CODE (typename) != TREE_LIST)
- return typename;
- return grokdeclarator (TREE_VALUE (typename),
- TREE_PURPOSE (typename),
- PARM, 0);
+ return type;
}
/* Decode a declarator in an ordinary declaration or data definition.
grokfield and not through here. */
tree
-start_decl (tree declarator, tree declspecs, int initialized, tree attributes)
+start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
+ bool initialized, tree attributes)
{
tree decl;
tree tem;
deprecated_state = DEPRECATED_SUPPRESS;
decl = grokdeclarator (declarator, declspecs,
- NORMAL, initialized);
+ NORMAL, initialized, NULL);
deprecated_state = DEPRECATED_NORMAL;
if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
&& MAIN_NAME_P (DECL_NAME (decl)))
- warning_with_decl (decl, "`%s' is usually a function");
+ warning ("%J%qD is usually a function", decl, decl);
if (initialized)
/* Is it valid for this decl to have an initializer at all?
If not, set INITIALIZED to zero, which will indirectly
- tell `finish_decl' to ignore the initializer once it is parsed. */
+ tell 'finish_decl' to ignore the initializer once it is parsed. */
switch (TREE_CODE (decl))
{
case TYPE_DECL:
- error ("typedef `%s' is initialized (use __typeof__ instead)",
- IDENTIFIER_POINTER (DECL_NAME (decl)));
+ error ("typedef %qD is initialized (use __typeof__ instead)", decl);
initialized = 0;
break;
case FUNCTION_DECL:
- error ("function `%s' is initialized like a variable",
- IDENTIFIER_POINTER (DECL_NAME (decl)));
+ error ("function %qD is initialized like a variable", decl);
initialized = 0;
break;
case PARM_DECL:
/* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
- error ("parameter `%s' is initialized",
- IDENTIFIER_POINTER (DECL_NAME (decl)));
+ error ("parameter %qD is initialized", decl);
initialized = 0;
break;
default:
- /* Don't allow initializations for incomplete types
- except for arrays which might be completed by the initialization. */
+ /* Don't allow initializations for incomplete types except for
+ arrays which might be completed by the initialization. */
- /* This can happen if the array size is an undefined macro. We already
- gave a warning, so we don't need another one. */
+ /* This can happen if the array size is an undefined macro.
+ We already gave a warning, so we don't need another one. */
if (TREE_TYPE (decl) == error_mark_node)
initialized = 0;
else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
}
else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
{
- error ("variable `%s' has initializer but incomplete type",
- IDENTIFIER_POINTER (DECL_NAME (decl)));
+ error ("variable %qD has initializer but incomplete type", decl);
initialized = 0;
}
else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
{
- error ("elements of array `%s' have incomplete type",
- IDENTIFIER_POINTER (DECL_NAME (decl)));
+ error ("elements of array %qD have incomplete type", decl);
+ initialized = 0;
+ }
+ else if (C_DECL_VARIABLE_SIZE (decl))
+ {
+ /* Although C99 is unclear about whether incomplete arrays
+ of VLAs themselves count as VLAs, it does not make
+ sense to permit them to be initialized given that
+ ordinary VLAs may not be initialized. */
+ error ("variable-sized object may not be initialized");
initialized = 0;
}
}
if (initialized)
{
- DECL_EXTERNAL (decl) = 0;
- if (current_binding_level == global_binding_level)
+ if (current_scope == file_scope)
TREE_STATIC (decl) = 1;
- /* Tell `pushdecl' this is an initialized decl
+ /* Tell 'pushdecl' this is an initialized decl
even though we don't yet have the initializer expression.
- Also tell `finish_decl' it may store the real initializer. */
+ Also tell 'finish_decl' it may store the real initializer. */
DECL_INITIAL (decl) = error_mark_node;
}
/* Set attributes here so if duplicate decl, will have proper attributes. */
decl_attributes (&decl, attributes, 0);
- /* If #pragma weak was used, mark the decl weak now. */
- if (current_binding_level == global_binding_level)
- maybe_apply_pragma_weak (decl);
+ if (TREE_CODE (decl) == FUNCTION_DECL
+ && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
+ {
+ struct c_declarator *ce = declarator;
+
+ if (ce->kind == cdk_pointer)
+ ce = declarator->declarator;
+ if (ce->kind == cdk_function)
+ {
+ tree args = ce->u.arg_info->parms;
+ for (; args; args = TREE_CHAIN (args))
+ {
+ tree type = TREE_TYPE (args);
+ if (type && INTEGRAL_TYPE_P (type)
+ && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
+ DECL_ARG_TYPE (args) = integer_type_node;
+ }
+ }
+ }
if (TREE_CODE (decl) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl)
&& DECL_UNINLINABLE (decl)
&& lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
- warning_with_decl (decl,
- "inline function `%s' given attribute noinline");
+ warning ("%Jinline function %qD given attribute noinline", decl, decl);
- /* Add this decl to the current binding level.
+ /* Add this decl to the current scope.
TEM may equal DECL or it may be a previous decl of the same name. */
tem = pushdecl (decl);
- /* For a local variable, define the RTL now. */
- if (current_binding_level != global_binding_level
- /* But not if this is a duplicate decl
- and we preserved the rtl from the previous one
- (which may or may not happen). */
- && !DECL_RTL_SET_P (tem)
- && C_DECL_FILE_SCOPE (tem))
+ if (initialized && DECL_EXTERNAL (tem))
{
- if (TREE_TYPE (tem) != error_mark_node
- && COMPLETE_TYPE_P (TREE_TYPE (tem)))
- expand_decl (tem);
- else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
- && DECL_INITIAL (tem) != 0)
- expand_decl (tem);
+ DECL_EXTERNAL (tem) = 0;
+ TREE_STATIC (tem) = 1;
}
return tem;
const char *asmspec = 0;
/* If a name was specified, get the string. */
- if (current_binding_level == global_binding_level)
+ if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
+ && DECL_FILE_SCOPE_P (decl))
asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
if (asmspec_tree)
asmspec = TREE_STRING_POINTER (asmspec_tree);
if (init)
store_init_value (decl, init);
- /* Deduce size of array from initialization, if not already known */
+ if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
+ || TREE_CODE (decl) == FUNCTION_DECL
+ || TREE_CODE (decl) == FIELD_DECL))
+ objc_check_decl (decl);
+
+ /* Deduce size of array from initialization, if not already known. */
if (TREE_CODE (type) == ARRAY_TYPE
&& TYPE_DOMAIN (type) == 0
&& TREE_CODE (decl) != TYPE_DECL)
type = TREE_TYPE (decl);
if (failure == 1)
- error_with_decl (decl, "initializer fails to determine size of `%s'");
+ error ("%Jinitializer fails to determine size of %qD", decl, decl);
else if (failure == 2)
{
if (do_default)
- error_with_decl (decl, "array size missing in `%s'");
+ error ("%Jarray size missing in %qD", decl, decl);
/* If a `static' var's size isn't known,
make it extern as well as static, so it does not get
allocated.
If it is not `static', then do not mark extern;
finish_incomplete_decl will give it a default size
and it will get allocated. */
- else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
+ else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
DECL_EXTERNAL (decl) = 1;
}
in the array, because we start counting at zero. Therefore,
warn only if the value is less than zero. */
else if (pedantic && TYPE_DOMAIN (type) != 0
- && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
- error_with_decl (decl, "zero or negative size array `%s'");
+ && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
+ error ("%Jzero or negative size array %qD", decl, decl);
layout_decl (decl, 0);
}
/* Don't give an error if we already gave one earlier. */
&& TREE_TYPE (decl) != error_mark_node
&& (TREE_STATIC (decl)
- ?
- /* A static variable with an incomplete type
- is an error if it is initialized.
- Also if it is not file scope.
- Otherwise, let it through, but if it is not `extern'
- then it may cause an error message later. */
- (DECL_INITIAL (decl) != 0
- || !C_DECL_FILE_SCOPE (decl))
- :
- /* An automatic variable with an incomplete type
- is an error. */
- !DECL_EXTERNAL (decl)))
- {
- error_with_decl (decl, "storage size of `%s' isn't known");
- TREE_TYPE (decl) = error_mark_node;
- }
+ /* A static variable with an incomplete type
+ is an error if it is initialized.
+ Also if it is not file scope.
+ Otherwise, let it through, but if it is not `extern'
+ then it may cause an error message later. */
+ ? (DECL_INITIAL (decl) != 0
+ || !DECL_FILE_SCOPE_P (decl))
+ /* An automatic variable with an incomplete type
+ is an error. */
+ : !DECL_EXTERNAL (decl)))
+ {
+ error ("%Jstorage size of %qD isn%'t known", decl, decl);
+ TREE_TYPE (decl) = error_mark_node;
+ }
if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
&& DECL_SIZE (decl) != 0)
if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
constant_expression_warning (DECL_SIZE (decl));
else
- error_with_decl (decl, "storage size of `%s' isn't constant");
+ error ("%Jstorage size of %qD isn%'t constant", decl, decl);
}
if (TREE_USED (type))
was a normal built-in. */
if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
{
- /* ASMSPEC is given, and not the name of a register. Mark the
- name with a star so assemble_name won't munge it. */
- char *starred = alloca (strlen (asmspec) + 2);
- starred[0] = '*';
- strcpy (starred + 1, asmspec);
-
if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
{
tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
- SET_DECL_RTL (builtin, NULL_RTX);
- SET_DECL_ASSEMBLER_NAME (builtin, get_identifier (starred));
-#ifdef TARGET_MEM_FUNCTIONS
- if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
- init_block_move_fn (starred);
- else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
- init_block_clear_fn (starred);
-#else
- if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BCOPY)
- init_block_move_fn (starred);
- else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BZERO)
- init_block_clear_fn (starred);
-#endif
- }
- SET_DECL_RTL (decl, NULL_RTX);
- SET_DECL_ASSEMBLER_NAME (decl, get_identifier (starred));
+ set_user_assembler_name (builtin, asmspec);
+ if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
+ init_block_move_fn (asmspec);
+ else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
+ init_block_clear_fn (asmspec);
+ }
+ set_user_assembler_name (decl, asmspec);
}
+ /* If #pragma weak was used, mark the decl weak now. */
+ if (current_scope == file_scope)
+ maybe_apply_pragma_weak (decl);
+
+ /* If this is a variable definition, determine its ELF visibility. */
+ if (TREE_CODE (decl) == VAR_DECL
+ && TREE_STATIC (decl)
+ && !DECL_EXTERNAL (decl))
+ c_determine_visibility (decl);
+
/* Output the assembler code and/or RTL code for variables and functions,
unless the type is an undefined structure or union.
If not, it will get done when the type is completed. */
if (c_dialect_objc ())
objc_check_decl (decl);
- if (C_DECL_FILE_SCOPE (decl))
+ if (asmspec)
+ {
+ /* If this is not a static variable, issue a warning.
+ It doesn't make any sense to give an ASMSPEC for an
+ ordinary, non-register local variable. Historically,
+ GCC has accepted -- but ignored -- the ASMSPEC in
+ this case. */
+ if (!DECL_FILE_SCOPE_P (decl)
+ && TREE_CODE (decl) == VAR_DECL
+ && !C_DECL_REGISTER (decl)
+ && !TREE_STATIC (decl))
+ warning ("%Jignoring asm-specifier for non-static local "
+ "variable %qD", decl, decl);
+ else if (C_DECL_REGISTER (decl))
+ change_decl_assembler_name (decl, get_identifier (asmspec));
+ else
+ set_user_assembler_name (decl, asmspec);
+ }
+
+ if (DECL_FILE_SCOPE_P (decl))
{
if (DECL_INITIAL (decl) == NULL_TREE
|| DECL_INITIAL (decl) == error_mark_node)
when a tentative file-scope definition is seen.
But at end of compilation, do output code for them. */
DECL_DEFER_OUTPUT (decl) = 1;
- rest_of_decl_compilation (decl, asmspec, true, 0);
+ rest_of_decl_compilation (decl, true, 0);
}
else
{
- /* This is a local variable. If there is an ASMSPEC, the
- user has requested that we handle it specially. */
- if (asmspec)
+ /* In conjunction with an ASMSPEC, the `register'
+ keyword indicates that we should place the variable
+ in a particular register. */
+ if (asmspec && C_DECL_REGISTER (decl))
{
- /* In conjunction with an ASMSPEC, the `register'
- keyword indicates that we should place the variable
- in a particular register. */
- if (DECL_REGISTER (decl))
- DECL_C_HARD_REGISTER (decl) = 1;
-
- /* If this is not a static variable, issue a warning.
- It doesn't make any sense to give an ASMSPEC for an
- ordinary, non-register local variable. Historically,
- GCC has accepted -- but ignored -- the ASMSPEC in
- this case. */
- if (TREE_CODE (decl) == VAR_DECL
- && !DECL_REGISTER (decl)
- && !TREE_STATIC (decl))
- warning_with_decl (decl,
- "ignoring asm-specifier for non-static local variable `%s'");
- else
- SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
+ DECL_HARD_REGISTER (decl) = 1;
+ /* This cannot be done for a structure with volatile
+ fields, on which DECL_REGISTER will have been
+ reset. */
+ if (!DECL_REGISTER (decl))
+ error ("cannot put object with volatile field into register");
}
if (TREE_CODE (decl) != FUNCTION_DECL)
- add_decl_stmt (decl);
+ {
+ /* If we're building a variable sized type, and we might be
+ reachable other than via the top of the current binding
+ level, then create a new BIND_EXPR so that we deallocate
+ the object at the right time. */
+ /* Note that DECL_SIZE can be null due to errors. */
+ if (DECL_SIZE (decl)
+ && !TREE_CONSTANT (DECL_SIZE (decl))
+ && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
+ {
+ tree bind;
+ bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
+ TREE_SIDE_EFFECTS (bind) = 1;
+ add_stmt (bind);
+ BIND_EXPR_BODY (bind) = push_stmt_list ();
+ }
+ add_stmt (build_stmt (DECL_EXPR, decl));
+ }
}
+
- if (!C_DECL_FILE_SCOPE (decl))
+ if (!DECL_FILE_SCOPE_P (decl))
{
/* Recompute the RTL of a local array now
if it used to be an incomplete type. */
if (was_incomplete
- && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
+ && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
{
/* If we used it already as memory, it must stay in memory. */
TREE_ADDRESSABLE (decl) = TREE_USED (decl);
/* If this was marked 'used', be sure it will be output. */
if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
- mark_referenced (DECL_ASSEMBLER_NAME (decl));
+ mark_decl_referenced (decl);
if (TREE_CODE (decl) == TYPE_DECL)
{
- /* This is a no-op in c-lang.c or something real in objc-act.c. */
- if (c_dialect_objc ())
- objc_check_decl (decl);
- rest_of_decl_compilation (decl, NULL, C_DECL_FILE_SCOPE (decl), 0);
+ if (!DECL_FILE_SCOPE_P (decl)
+ && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
+ add_stmt (build_stmt (DECL_EXPR, decl));
+
+ rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
}
/* At the end of a declaration, throw away any variable type sizes
of types defined inside that declaration. There is no use
computing them in the following function definition. */
- if (current_binding_level == global_binding_level)
+ if (current_scope == file_scope)
get_pending_sizes ();
/* Install a cleanup (aka destructor) if one was given. */
tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
if (attr)
{
- static bool eh_initialized_p;
-
tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
tree cleanup_decl = lookup_name (cleanup_id);
tree cleanup;
/* Don't warn about decl unused; the cleanup uses it. */
TREE_USED (decl) = 1;
+ TREE_USED (cleanup_decl) = 1;
/* Initialize EH, if we've been told to do so. */
- if (flag_exceptions && !eh_initialized_p)
+ if (flag_exceptions && !c_eh_initialized_p)
{
- eh_initialized_p = true;
+ c_eh_initialized_p = true;
eh_personality_libfunc
= init_one_libfunc (USING_SJLJ_EXCEPTIONS
? "__gcc_personality_sj0"
using_eh_for_cleanups ();
}
- add_stmt (build_stmt (CLEANUP_STMT, decl, cleanup));
+ push_cleanup (decl, cleanup, false);
}
}
}
-/* Given a parsed parameter declaration,
- decode it into a PARM_DECL and push that on the current binding level.
- Also, for the sake of forward parm decls,
- record the given order of parms in `parm_order'. */
+/* Given a parsed parameter declaration, decode it into a PARM_DECL. */
+
+tree
+grokparm (const struct c_parm *parm)
+{
+ tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
+ NULL);
+
+ decl_attributes (&decl, parm->attrs, 0);
+
+ return decl;
+}
+
+/* Given a parsed parameter declaration, decode it into a PARM_DECL
+ and push that on the current scope. */
void
-push_parm_decl (tree parm)
+push_parm_decl (const struct c_parm *parm)
{
tree decl;
- int old_immediate_size_expand = immediate_size_expand;
- /* Don't try computing parm sizes now -- wait till fn is called. */
- immediate_size_expand = 0;
- decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
- TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
- decl_attributes (&decl, TREE_VALUE (parm), 0);
+ decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL);
+ decl_attributes (&decl, parm->attrs, 0);
decl = pushdecl (decl);
- immediate_size_expand = old_immediate_size_expand;
-
- current_binding_level->parm_order
- = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
-
- /* Add this decl to the current binding level. */
finish_decl (decl, NULL_TREE, NULL_TREE);
}
-/* Clear the given order of parms in `parm_order'.
- Used at start of parm list,
- and also at semicolon terminating forward decls. */
+/* Mark all the parameter declarations to date as forward decls.
+ Also diagnose use of this extension. */
void
-clear_parm_order (void)
+mark_forward_parm_decls (void)
{
- current_binding_level->parm_order = NULL_TREE;
+ struct c_binding *b;
+
+ if (pedantic && !current_scope->warned_forward_parm_decls)
+ {
+ pedwarn ("ISO C forbids forward parameter declarations");
+ current_scope->warned_forward_parm_decls = true;
+ }
+
+ for (b = current_scope->bindings; b; b = b->prev)
+ if (TREE_CODE (b->decl) == PARM_DECL)
+ TREE_ASM_WRITTEN (b->decl) = 1;
}
\f
static GTY(()) int compound_literal_number;
{
/* We do not use start_decl here because we have a type, not a declarator;
and do not use finish_decl because the decl should be stored inside
- the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
- tree decl = build_decl (VAR_DECL, NULL_TREE, type);
+ the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
+ tree decl;
tree complit;
tree stmt;
+
+ if (type == error_mark_node)
+ return error_mark_node;
+
+ decl = build_decl (VAR_DECL, NULL_TREE, type);
DECL_EXTERNAL (decl) = 0;
TREE_PUBLIC (decl) = 0;
- TREE_STATIC (decl) = (current_binding_level == global_binding_level);
+ TREE_STATIC (decl) = (current_scope == file_scope);
DECL_CONTEXT (decl) = current_function_decl;
TREE_USED (decl) = 1;
TREE_TYPE (decl) = type;
- TREE_READONLY (decl) = TREE_READONLY (type);
+ TREE_READONLY (decl) = TYPE_READONLY (type);
store_init_value (decl, init);
if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
{
int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
- if (failure)
- abort ();
+
+ gcc_assert (!failure);
}
type = TREE_TYPE (decl);
if (type == error_mark_node || !COMPLETE_TYPE_P (type))
return error_mark_node;
- stmt = build_stmt (DECL_STMT, decl);
+ stmt = build_stmt (DECL_EXPR, decl);
complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
TREE_SIDE_EFFECTS (complit) = 1;
DECL_COMDAT (decl) = 1;
DECL_ARTIFICIAL (decl) = 1;
pushdecl (decl);
- rest_of_decl_compilation (decl, NULL, 1, 0);
+ rest_of_decl_compilation (decl, 1, 0);
}
return complit;
{
int eltsize
= int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
- maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
- / eltsize) - 1, 0);
+ maxindex = build_int_cst (NULL_TREE,
+ (TREE_STRING_LENGTH (initial_value)
+ / eltsize) - 1);
}
else if (TREE_CODE (initial_value) == CONSTRUCTOR)
{
tree elts = CONSTRUCTOR_ELTS (initial_value);
- maxindex = build_int_2 (-1, -1);
+ maxindex = build_int_cst (NULL_TREE, -1);
for (; elts; elts = TREE_CHAIN (elts))
{
if (TREE_PURPOSE (elts))
maxindex = TREE_PURPOSE (elts);
else
- maxindex = fold (build (PLUS_EXPR, integer_type_node,
- maxindex, integer_one_node));
+ maxindex = fold (build2 (PLUS_EXPR, integer_type_node,
+ maxindex, integer_one_node));
}
- maxindex = copy_node (maxindex);
}
else
{
value = 1;
/* Prevent further error messages. */
- maxindex = build_int_2 (0, 0);
+ maxindex = build_int_cst (NULL_TREE, 0);
}
}
if (!maxindex)
{
if (do_default)
- maxindex = build_int_2 (0, 0);
+ maxindex = build_int_cst (NULL_TREE, 0);
value = 2;
}
if (maxindex)
{
TYPE_DOMAIN (type) = build_index_type (maxindex);
- if (!TREE_TYPE (maxindex))
- TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
+
+ gcc_assert (TREE_TYPE (maxindex));
}
/* Lay out the type now that we can get the real answer. */
}
}
\f
-/* Given declspecs and a declarator,
- determine the name and type of the object declared
- and construct a ..._DECL node for it.
- (In one case we can return a ..._TYPE node instead.
- For invalid input we sometimes return 0.)
+/* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
+ replacing with appropriate values if they are invalid. */
+static void
+check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
+{
+ tree type_mv;
+ unsigned int max_width;
+ unsigned HOST_WIDE_INT w;
+ const char *name = orig_name ? orig_name: _("<anonymous>");
- DECLSPECS is a chain of tree_list nodes whose value fields
- are the storage classes and type specifiers.
+ /* Necessary? */
+ STRIP_NOPS (*width);
- DECL_CONTEXT says which syntactic context this declaration is in:
- NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
- FUNCDEF for a function definition. Like NORMAL but a few different
+ /* Detect and ignore out of range field width and process valid
+ field widths. */
+ if (TREE_CODE (*width) != INTEGER_CST)
+ {
+ error ("bit-field %qs width not an integer constant", name);
+ *width = integer_one_node;
+ }
+ else
+ {
+ constant_expression_warning (*width);
+ if (tree_int_cst_sgn (*width) < 0)
+ {
+ error ("negative width in bit-field %qs", name);
+ *width = integer_one_node;
+ }
+ else if (integer_zerop (*width) && orig_name)
+ {
+ error ("zero width for bit-field %qs", name);
+ *width = integer_one_node;
+ }
+ }
+
+ /* Detect invalid bit-field type. */
+ if (TREE_CODE (*type) != INTEGER_TYPE
+ && TREE_CODE (*type) != BOOLEAN_TYPE
+ && TREE_CODE (*type) != ENUMERAL_TYPE)
+ {
+ error ("bit-field %qs has invalid type", name);
+ *type = unsigned_type_node;
+ }
+
+ type_mv = TYPE_MAIN_VARIANT (*type);
+ if (pedantic
+ && type_mv != integer_type_node
+ && type_mv != unsigned_type_node
+ && type_mv != boolean_type_node)
+ pedwarn ("type of bit-field %qs is a GCC extension", name);
+
+ if (type_mv == boolean_type_node)
+ max_width = CHAR_TYPE_SIZE;
+ else
+ max_width = TYPE_PRECISION (*type);
+
+ if (0 < compare_tree_int (*width, max_width))
+ {
+ error ("width of %qs exceeds its type", name);
+ w = max_width;
+ *width = build_int_cst (NULL_TREE, w);
+ }
+ else
+ w = tree_low_cst (*width, 1);
+
+ if (TREE_CODE (*type) == ENUMERAL_TYPE)
+ {
+ struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
+ if (!lt
+ || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
+ || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
+ warning ("%qs is narrower than values of its type", name);
+ }
+}
+\f
+/* Given declspecs and a declarator,
+ determine the name and type of the object declared
+ and construct a ..._DECL node for it.
+ (In one case we can return a ..._TYPE node instead.
+ For invalid input we sometimes return 0.)
+
+ DECLSPECS is a c_declspecs structure for the declaration specifiers.
+
+ DECL_CONTEXT says which syntactic context this declaration is in:
+ NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
+ FUNCDEF for a function definition. Like NORMAL but a few different
error messages in each case. Return value may be zero meaning
this definition is too screwy to try to parse.
PARM for a parameter declaration (either within a function prototype
TYPENAME if for a typename (in a cast or sizeof).
Don't make a DECL node; just return the ..._TYPE node.
FIELD for a struct or union field; make a FIELD_DECL.
- BITFIELD for a field with specified width.
- INITIALIZED is 1 if the decl has an initializer.
+ INITIALIZED is true if the decl has an initializer.
+ WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
+ representing the width of the bit-field.
In the TYPENAME case, DECLARATOR is really an absolute declarator.
It may also be so in the PARM case, for a prototype where the
and `extern' are interpreted. */
static tree
-grokdeclarator (tree declarator, tree declspecs,
- enum decl_context decl_context, int initialized)
+grokdeclarator (const struct c_declarator *declarator,
+ struct c_declspecs *declspecs,
+ enum decl_context decl_context, bool initialized, tree *width)
{
- int specbits = 0;
- tree spec;
- tree type = NULL_TREE;
- int longlong = 0;
+ tree type = declspecs->type;
+ bool threadp = declspecs->thread_p;
+ enum c_storage_class storage_class = declspecs->storage_class;
int constp;
int restrictp;
int volatilep;
int type_quals = TYPE_UNQUALIFIED;
- int inlinep;
- int explicit_int = 0;
- int explicit_char = 0;
- int defaulted_int = 0;
- tree typedef_decl = 0;
- const char *name;
+ const char *name, *orig_name;
tree typedef_type = 0;
int funcdef_flag = 0;
- enum tree_code innermost_code = ERROR_MARK;
- int bitfield = 0;
+ bool funcdef_syntax = false;
int size_varies = 0;
- tree decl_attr = NULL_TREE;
- tree array_ptr_quals = NULL_TREE;
+ tree decl_attr = declspecs->decl_attr;
+ int array_ptr_quals = TYPE_UNQUALIFIED;
+ tree array_ptr_attrs = NULL_TREE;
int array_parm_static = 0;
tree returned_attrs = NULL_TREE;
-
- if (decl_context == BITFIELD)
- bitfield = 1, decl_context = FIELD;
+ bool bitfield = width != NULL;
+ tree element_type;
+ struct c_arg_info *arg_info = 0;
if (decl_context == FUNCDEF)
funcdef_flag = 1, decl_context = NORMAL;
/* Look inside a declarator for the name being declared
and get it as a string, for an error message. */
{
- tree decl = declarator;
+ const struct c_declarator *decl = declarator;
name = 0;
while (decl)
- switch (TREE_CODE (decl))
+ switch (decl->kind)
{
- case ARRAY_REF:
- case INDIRECT_REF:
- case CALL_EXPR:
- innermost_code = TREE_CODE (decl);
- decl = TREE_OPERAND (decl, 0);
+ case cdk_function:
+ case cdk_array:
+ case cdk_pointer:
+ funcdef_syntax = (decl->kind == cdk_function);
+ decl = decl->declarator;
break;
- case TREE_LIST:
- decl = TREE_VALUE (decl);
+ case cdk_attrs:
+ decl = decl->declarator;
break;
- case IDENTIFIER_NODE:
- name = IDENTIFIER_POINTER (decl);
+ case cdk_id:
+ if (decl->u.id)
+ name = IDENTIFIER_POINTER (decl->u.id);
decl = 0;
break;
default:
- abort ();
+ gcc_unreachable ();
}
+ orig_name = name;
if (name == 0)
name = "type name";
}
/* A function definition's declarator must have the form of
a function declarator. */
- if (funcdef_flag && innermost_code != CALL_EXPR)
+ if (funcdef_flag && !funcdef_syntax)
return 0;
- /* Anything declared one level down from the top level
- must be one of the parameters of a function
- (because the body is at least two levels down). */
-
/* If this looks like a function definition, make it one,
even if it occurs where parms are expected.
Then store_parm_decls will reject it and not use it as a parm. */
- if (decl_context == NORMAL && !funcdef_flag
- && current_binding_level->parm_flag)
+ if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
decl_context = PARM;
- /* Look through the decl specs and record which ones appear.
- Some typespecs are defined as built-in typenames.
- Others, the ones that are modifiers of other types,
- are represented by bits in SPECBITS: set the bits for
- the modifiers that appear. Storage class keywords are also in SPECBITS.
-
- If there is a typedef name or a type, store the type in TYPE.
- This includes builtin typedefs such as `int'.
-
- Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
- and did not come from a user typedef.
-
- Set LONGLONG if `long' is mentioned twice. */
-
- for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
- {
- tree id = TREE_VALUE (spec);
-
- /* If the entire declaration is itself tagged as deprecated then
- suppress reports of deprecated items. */
- if (id && TREE_DEPRECATED (id))
- {
- if (deprecated_state != DEPRECATED_SUPPRESS)
- warn_deprecated_use (id);
- }
-
- if (id == ridpointers[(int) RID_INT])
- explicit_int = 1;
- if (id == ridpointers[(int) RID_CHAR])
- explicit_char = 1;
-
- if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
- {
- enum rid i = C_RID_CODE (id);
- if ((int) i <= (int) RID_LAST_MODIFIER)
- {
- if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
- {
- if (longlong)
- error ("`long long long' is too long for GCC");
- else
- {
- if (pedantic && !flag_isoc99 && ! in_system_header
- && warn_long_long)
- pedwarn ("ISO C90 does not support `long long'");
- longlong = 1;
- }
- }
- else if (specbits & (1 << (int) i))
- {
- if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
- {
- if (!flag_isoc99)
- pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
- }
- else
- error ("duplicate `%s'", IDENTIFIER_POINTER (id));
- }
-
- /* Diagnose "__thread extern". Recall that this list
- is in the reverse order seen in the text. */
- if (i == RID_THREAD
- && (specbits & (1 << (int) RID_EXTERN
- | 1 << (int) RID_STATIC)))
- {
- if (specbits & 1 << (int) RID_EXTERN)
- error ("`__thread' before `extern'");
- else
- error ("`__thread' before `static'");
- }
-
- specbits |= 1 << (int) i;
- goto found;
- }
- }
- if (type)
- error ("two or more data types in declaration of `%s'", name);
- /* Actual typedefs come to us as TYPE_DECL nodes. */
- else if (TREE_CODE (id) == TYPE_DECL)
- {
- if (TREE_TYPE (id) == error_mark_node)
- ; /* Allow the type to default to int to avoid cascading errors. */
- else
- {
- type = TREE_TYPE (id);
- decl_attr = DECL_ATTRIBUTES (id);
- typedef_decl = id;
- }
- }
- /* Built-in types come as identifiers. */
- else if (TREE_CODE (id) == IDENTIFIER_NODE)
- {
- tree t = lookup_name (id);
- if (TREE_TYPE (t) == error_mark_node)
- ;
- else if (!t || TREE_CODE (t) != TYPE_DECL)
- error ("`%s' fails to be a typedef or built in type",
- IDENTIFIER_POINTER (id));
- else
- {
- type = TREE_TYPE (t);
- typedef_decl = t;
- }
- }
- else if (TREE_CODE (id) != ERROR_MARK)
- type = id;
-
- found:
- ;
- }
+ if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
+ warn_deprecated_use (declspecs->type);
typedef_type = type;
- if (type)
- size_varies = C_TYPE_VARIABLE_SIZE (type);
+ size_varies = C_TYPE_VARIABLE_SIZE (type);
- /* No type at all: default to `int', and set DEFAULTED_INT
- because it was not a user-defined typedef. */
+ /* Diagnose defaulting to "int". */
- if (type == 0)
+ if (declspecs->default_int_p && !in_system_header)
{
- if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
- | (1 << (int) RID_SIGNED)
- | (1 << (int) RID_UNSIGNED)
- | (1 << (int) RID_COMPLEX))))
- /* Don't warn about typedef foo = bar. */
- && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
- && ! in_system_header)
- {
- /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
- and this is a function, or if -Wimplicit; prefer the former
- warning since it is more explicit. */
- if ((warn_implicit_int || warn_return_type || flag_isoc99)
- && funcdef_flag)
- warn_about_return_type = 1;
- else if (warn_implicit_int || flag_isoc99)
- pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
- name);
- }
-
- defaulted_int = 1;
- type = integer_type_node;
+ /* Issue a warning if this is an ISO C 99 program or if
+ -Wreturn-type and this is a function, or if -Wimplicit;
+ prefer the former warning since it is more explicit. */
+ if ((warn_implicit_int || warn_return_type || flag_isoc99)
+ && funcdef_flag)
+ warn_about_return_type = 1;
+ else if (warn_implicit_int || flag_isoc99)
+ pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name);
}
- /* Now process the modifiers that were specified
- and check for invalid combinations. */
+ /* Adjust the type if a bit-field is being declared,
+ -funsigned-bitfields applied and the type is not explicitly
+ "signed". */
+ if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
+ && TREE_CODE (type) == INTEGER_TYPE)
+ type = c_common_unsigned_type (type);
- /* Long double is a special combination. */
+ /* Check the type and width of a bit-field. */
+ if (bitfield)
+ check_bitfield_type_and_width (&type, width, orig_name);
- if ((specbits & 1 << (int) RID_LONG) && ! longlong
- && TYPE_MAIN_VARIANT (type) == double_type_node)
+ /* Figure out the type qualifiers for the declaration. There are
+ two ways a declaration can become qualified. One is something
+ like `const int i' where the `const' is explicit. Another is
+ something like `typedef const int CI; CI i' where the type of the
+ declaration contains the `const'. A third possibility is that
+ there is a type qualifier on the element type of a typedefed
+ array type, in which case we should extract that qualifier so
+ that c_apply_type_quals_to_decls receives the full list of
+ qualifiers to work with (C90 is not entirely clear about whether
+ duplicate qualifiers should be diagnosed in this case, but it
+ seems most appropriate to do so). */
+ element_type = strip_array_types (type);
+ constp = declspecs->const_p + TYPE_READONLY (element_type);
+ restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
+ volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
+ if (pedantic && !flag_isoc99)
{
- specbits &= ~(1 << (int) RID_LONG);
- type = long_double_type_node;
+ if (constp > 1)
+ pedwarn ("duplicate %<const%>");
+ if (restrictp > 1)
+ pedwarn ("duplicate %<restrict%>");
+ if (volatilep > 1)
+ pedwarn ("duplicate %<volatile%>");
}
+ if (!flag_gen_aux_info && (TYPE_QUALS (type)))
+ type = TYPE_MAIN_VARIANT (type);
+ type_quals = ((constp ? TYPE_QUAL_CONST : 0)
+ | (restrictp ? TYPE_QUAL_RESTRICT : 0)
+ | (volatilep ? TYPE_QUAL_VOLATILE : 0));
- /* Check all other uses of type modifiers. */
-
- if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
- | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
+ /* Warn about storage classes that are invalid for certain
+ kinds of declarations (parameters, typenames, etc.). */
+
+ if (funcdef_flag
+ && (threadp
+ || storage_class == csc_auto
+ || storage_class == csc_register
+ || storage_class == csc_typedef))
+ {
+ if (storage_class == csc_auto
+ && (pedantic || current_scope == file_scope))
+ pedwarn ("function definition declared %<auto%>");
+ if (storage_class == csc_register)
+ error ("function definition declared %<register%>");
+ if (storage_class == csc_typedef)
+ error ("function definition declared %<typedef%>");
+ if (threadp)
+ error ("function definition declared %<__thread%>");
+ threadp = false;
+ if (storage_class == csc_auto
+ || storage_class == csc_register
+ || storage_class == csc_typedef)
+ storage_class = csc_none;
+ }
+ else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
{
- int ok = 0;
-
- if ((specbits & 1 << (int) RID_LONG)
- && (specbits & 1 << (int) RID_SHORT))
- error ("both long and short specified for `%s'", name);
- else if (((specbits & 1 << (int) RID_LONG)
- || (specbits & 1 << (int) RID_SHORT))
- && explicit_char)
- error ("long or short specified with char for `%s'", name);
- else if (((specbits & 1 << (int) RID_LONG)
- || (specbits & 1 << (int) RID_SHORT))
- && TREE_CODE (type) == REAL_TYPE)
- {
- static int already = 0;
-
- error ("long or short specified with floating type for `%s'", name);
- if (! already && ! pedantic)
- {
- error ("the only valid combination is `long double'");
- already = 1;
- }
- }
- else if ((specbits & 1 << (int) RID_SIGNED)
- && (specbits & 1 << (int) RID_UNSIGNED))
- error ("both signed and unsigned specified for `%s'", name);
- else if (TREE_CODE (type) != INTEGER_TYPE)
- error ("long, short, signed or unsigned invalid for `%s'", name);
+ if (decl_context == PARM && storage_class == csc_register)
+ ;
else
{
- ok = 1;
- if (!explicit_int && !defaulted_int && !explicit_char)
+ switch (decl_context)
{
- error ("long, short, signed or unsigned used invalidly for `%s'",
+ case FIELD:
+ error ("storage class specified for structure field %qs",
name);
- ok = 0;
+ break;
+ case PARM:
+ error ("storage class specified for parameter %qs", name);
+ break;
+ default:
+ error ("storage class specified for typename");
+ break;
}
- }
-
- /* Discard the type modifiers if they are invalid. */
- if (! ok)
- {
- specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
- | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
- longlong = 0;
+ storage_class = csc_none;
+ threadp = false;
}
}
-
- if ((specbits & (1 << (int) RID_COMPLEX))
- && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
- {
- error ("complex invalid for `%s'", name);
- specbits &= ~(1 << (int) RID_COMPLEX);
- }
-
- /* Decide whether an integer type is signed or not.
- Optionally treat bitfields as signed by default. */
- if (specbits & 1 << (int) RID_UNSIGNED
- || (bitfield && ! flag_signed_bitfields
- && (explicit_int || defaulted_int || explicit_char
- /* A typedef for plain `int' without `signed'
- can be controlled just like plain `int'. */
- || ! (typedef_decl != 0
- && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
- && TREE_CODE (type) != ENUMERAL_TYPE
- && !(specbits & 1 << (int) RID_SIGNED)))
- {
- if (longlong)
- type = long_long_unsigned_type_node;
- else if (specbits & 1 << (int) RID_LONG)
- type = long_unsigned_type_node;
- else if (specbits & 1 << (int) RID_SHORT)
- type = short_unsigned_type_node;
- else if (type == char_type_node)
- type = unsigned_char_type_node;
- else if (typedef_decl)
- type = c_common_unsigned_type (type);
- else
- type = unsigned_type_node;
- }
- else if ((specbits & 1 << (int) RID_SIGNED)
- && type == char_type_node)
- type = signed_char_type_node;
- else if (longlong)
- type = long_long_integer_type_node;
- else if (specbits & 1 << (int) RID_LONG)
- type = long_integer_type_node;
- else if (specbits & 1 << (int) RID_SHORT)
- type = short_integer_type_node;
-
- if (specbits & 1 << (int) RID_COMPLEX)
- {
- if (pedantic && !flag_isoc99)
- pedwarn ("ISO C90 does not support complex types");
- /* If we just have "complex", it is equivalent to
- "complex double", but if any modifiers at all are specified it is
- the complex form of TYPE. E.g, "complex short" is
- "complex short int". */
-
- if (defaulted_int && ! longlong
- && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
- | (1 << (int) RID_SIGNED)
- | (1 << (int) RID_UNSIGNED))))
- {
- if (pedantic)
- pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
- type = complex_double_type_node;
- }
- else if (type == integer_type_node)
- {
- if (pedantic)
- pedwarn ("ISO C does not support complex integer types");
- type = complex_integer_type_node;
- }
- else if (type == float_type_node)
- type = complex_float_type_node;
- else if (type == double_type_node)
- type = complex_double_type_node;
- else if (type == long_double_type_node)
- type = complex_long_double_type_node;
+ else if (storage_class == csc_extern
+ && initialized
+ && !funcdef_flag)
+ {
+ /* 'extern' with initialization is invalid if not at file scope. */
+ if (current_scope == file_scope)
+ warning ("%qs initialized and declared %<extern%>", name);
else
+ error ("%qs has both %<extern%> and initializer", name);
+ }
+ else if (current_scope == file_scope)
+ {
+ if (storage_class == csc_auto)
+ error ("file-scope declaration of %qs specifies %<auto%>", name);
+ if (pedantic && storage_class == csc_register)
+ pedwarn ("file-scope declaration of %qs specifies %<register%>", name);
+ }
+ else
+ {
+ if (storage_class == csc_extern && funcdef_flag)
+ error ("nested function %qs declared %<extern%>", name);
+ else if (threadp && storage_class == csc_none)
{
- if (pedantic)
- pedwarn ("ISO C does not support complex integer types");
- type = build_complex_type (type);
+ error ("function-scope %qs implicitly auto and declared "
+ "%<__thread%>",
+ name);
+ threadp = false;
}
}
- /* Figure out the type qualifiers for the declaration. There are
- two ways a declaration can become qualified. One is something
- like `const int i' where the `const' is explicit. Another is
- something like `typedef const int CI; CI i' where the type of the
- declaration contains the `const'. */
- constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
- restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
- volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
- inlinep = !! (specbits & (1 << (int) RID_INLINE));
- if (constp > 1 && ! flag_isoc99)
- pedwarn ("duplicate `const'");
- if (restrictp > 1 && ! flag_isoc99)
- pedwarn ("duplicate `restrict'");
- if (volatilep > 1 && ! flag_isoc99)
- pedwarn ("duplicate `volatile'");
- if (! flag_gen_aux_info && (TYPE_QUALS (type)))
- type = TYPE_MAIN_VARIANT (type);
- type_quals = ((constp ? TYPE_QUAL_CONST : 0)
- | (restrictp ? TYPE_QUAL_RESTRICT : 0)
- | (volatilep ? TYPE_QUAL_VOLATILE : 0));
-
- /* Warn if two storage classes are given. Default to `auto'. */
-
- {
- int nclasses = 0;
-
- if (specbits & 1 << (int) RID_AUTO) nclasses++;
- if (specbits & 1 << (int) RID_STATIC) nclasses++;
- if (specbits & 1 << (int) RID_EXTERN) nclasses++;
- if (specbits & 1 << (int) RID_REGISTER) nclasses++;
- if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
-
- /* "static __thread" and "extern __thread" are allowed. */
- if ((specbits & (1 << (int) RID_THREAD
- | 1 << (int) RID_STATIC
- | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
- nclasses++;
-
- /* Warn about storage classes that are invalid for certain
- kinds of declarations (parameters, typenames, etc.). */
-
- if (nclasses > 1)
- error ("multiple storage classes in declaration of `%s'", name);
- else if (funcdef_flag
- && (specbits
- & ((1 << (int) RID_REGISTER)
- | (1 << (int) RID_AUTO)
- | (1 << (int) RID_TYPEDEF)
- | (1 << (int) RID_THREAD))))
- {
- if (specbits & 1 << (int) RID_AUTO
- && (pedantic || current_binding_level == global_binding_level))
- pedwarn ("function definition declared `auto'");
- if (specbits & 1 << (int) RID_REGISTER)
- error ("function definition declared `register'");
- if (specbits & 1 << (int) RID_TYPEDEF)
- error ("function definition declared `typedef'");
- if (specbits & 1 << (int) RID_THREAD)
- error ("function definition declared `__thread'");
- specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
- | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
- }
- else if (decl_context != NORMAL && nclasses > 0)
- {
- if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
- ;
- else
- {
- switch (decl_context)
- {
- case FIELD:
- error ("storage class specified for structure field `%s'",
- name);
- break;
- case PARM:
- error ("storage class specified for parameter `%s'", name);
- break;
- default:
- error ("storage class specified for typename");
- break;
- }
- specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
- | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
- | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
- }
- }
- else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
- {
- /* `extern' with initialization is invalid if not at top level. */
- if (current_binding_level == global_binding_level)
- warning ("`%s' initialized and declared `extern'", name);
- else
- error ("`%s' has both `extern' and initializer", name);
- }
- else if (current_binding_level == global_binding_level)
- {
- if (specbits & 1 << (int) RID_AUTO)
- error ("top-level declaration of `%s' specifies `auto'", name);
- }
- else
- {
- if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
- error ("nested function `%s' declared `extern'", name);
- else if ((specbits & (1 << (int) RID_THREAD
- | 1 << (int) RID_EXTERN
- | 1 << (int) RID_STATIC))
- == (1 << (int) RID_THREAD))
- {
- error ("function-scope `%s' implicitly auto and declared `__thread'",
- name);
- specbits &= ~(1 << (int) RID_THREAD);
- }
- }
- }
-
/* Now figure out the structure of the declarator proper.
Descend through it, creating more complex types, until we reach
the declared identifier (or NULL_TREE, in an absolute declarator). */
- while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
+ while (declarator && declarator->kind != cdk_id)
{
if (type == error_mark_node)
{
- declarator = TREE_OPERAND (declarator, 0);
+ declarator = declarator->declarator;
continue;
}
- /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
- an INDIRECT_REF (for *...),
- a CALL_EXPR (for ...(...)),
- a TREE_LIST (for nested attributes),
- an identifier (for the name being declared)
- or a null pointer (for the place in an absolute declarator
+ /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
+ a cdk_pointer (for *...),
+ a cdk_function (for ...(...)),
+ a cdk_attrs (for nested attributes),
+ or a cdk_id (for the name being declared
+ or the place in an absolute declarator
where the name was omitted).
- For the last two cases, we have just exited the loop.
+ For the last case, we have just exited the loop.
At this point, TYPE is the type of elements of an array,
or for a function to return, or for a pointer to point to.
array or function or pointer, and DECLARATOR has had its
outermost layer removed. */
- if (array_ptr_quals != NULL_TREE || array_parm_static)
+ if (array_ptr_quals != TYPE_UNQUALIFIED
+ || array_ptr_attrs != NULL_TREE
+ || array_parm_static)
{
/* Only the innermost declarator (making a parameter be of
array type which is converted to pointer type)
may have static or type qualifiers. */
error ("static or type qualifiers in non-parameter array declarator");
- array_ptr_quals = NULL_TREE;
+ array_ptr_quals = TYPE_UNQUALIFIED;
+ array_ptr_attrs = NULL_TREE;
array_parm_static = 0;
}
- if (TREE_CODE (declarator) == TREE_LIST)
+ switch (declarator->kind)
{
- /* We encode a declarator with embedded attributes using
- a TREE_LIST. */
- tree attrs = TREE_PURPOSE (declarator);
- tree inner_decl;
- int attr_flags = 0;
- declarator = TREE_VALUE (declarator);
- inner_decl = declarator;
- while (inner_decl != NULL_TREE
- && TREE_CODE (inner_decl) == TREE_LIST)
- inner_decl = TREE_VALUE (inner_decl);
- if (inner_decl == NULL_TREE
- || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
- attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
- else if (TREE_CODE (inner_decl) == CALL_EXPR)
- attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
- else if (TREE_CODE (inner_decl) == ARRAY_REF)
- attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
- returned_attrs = decl_attributes (&type,
- chainon (returned_attrs, attrs),
- attr_flags);
- }
- else if (TREE_CODE (declarator) == ARRAY_REF)
- {
- tree itype = NULL_TREE;
- tree size = TREE_OPERAND (declarator, 1);
- /* The index is a signed object `sizetype' bits wide. */
- tree index_type = c_common_signed_type (sizetype);
-
- array_ptr_quals = TREE_TYPE (declarator);
- array_parm_static = TREE_STATIC (declarator);
-
- declarator = TREE_OPERAND (declarator, 0);
-
- /* Check for some types that there cannot be arrays of. */
-
- if (VOID_TYPE_P (type))
- {
- error ("declaration of `%s' as array of voids", name);
- type = error_mark_node;
- }
-
- if (TREE_CODE (type) == FUNCTION_TYPE)
- {
- error ("declaration of `%s' as array of functions", name);
+ case cdk_attrs:
+ {
+ /* A declarator with embedded attributes. */
+ tree attrs = declarator->u.attrs;
+ const struct c_declarator *inner_decl;
+ int attr_flags = 0;
+ declarator = declarator->declarator;
+ inner_decl = declarator;
+ while (inner_decl->kind == cdk_attrs)
+ inner_decl = inner_decl->declarator;
+ if (inner_decl->kind == cdk_id)
+ attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
+ else if (inner_decl->kind == cdk_function)
+ attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
+ else if (inner_decl->kind == cdk_array)
+ attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
+ returned_attrs = decl_attributes (&type,
+ chainon (returned_attrs, attrs),
+ attr_flags);
+ break;
+ }
+ case cdk_array:
+ {
+ tree itype = NULL_TREE;
+ tree size = declarator->u.array.dimen;
+ /* The index is a signed object `sizetype' bits wide. */
+ tree index_type = c_common_signed_type (sizetype);
+
+ array_ptr_quals = declarator->u.array.quals;
+ array_ptr_attrs = declarator->u.array.attrs;
+ array_parm_static = declarator->u.array.static_p;
+
+ declarator = declarator->declarator;
+
+ /* Check for some types that there cannot be arrays of. */
+
+ if (VOID_TYPE_P (type))
+ {
+ error ("declaration of %qs as array of voids", name);
+ type = error_mark_node;
+ }
+
+ if (TREE_CODE (type) == FUNCTION_TYPE)
+ {
+ error ("declaration of %qs as array of functions", name);
+ type = error_mark_node;
+ }
+
+ if (pedantic && !in_system_header && flexible_array_type_p (type))
+ pedwarn ("invalid use of structure with flexible array member");
+
+ if (size == error_mark_node)
type = error_mark_node;
- }
-
- if (pedantic && flexible_array_type_p (type))
- pedwarn ("invalid use of structure with flexible array member");
-
- if (size == error_mark_node)
- type = error_mark_node;
-
- if (type == error_mark_node)
- continue;
-
- /* If size was specified, set ITYPE to a range-type for that size.
- Otherwise, ITYPE remains null. finish_decl may figure it out
- from an initial value. */
-
- if (size)
- {
- /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
- STRIP_TYPE_NOPS (size);
-
- if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
- {
- error ("size of array `%s' has non-integer type", name);
- size = integer_one_node;
- }
-
- if (pedantic && integer_zerop (size))
- pedwarn ("ISO C forbids zero-size array `%s'", name);
-
- if (TREE_CODE (size) == INTEGER_CST)
- {
- constant_expression_warning (size);
- if (tree_int_cst_sgn (size) < 0)
- {
- error ("size of array `%s' is negative", name);
- size = integer_one_node;
- }
- }
- else
- {
- /* Make sure the array size remains visibly nonconstant
- even if it is (eg) a const variable with known value. */
- size_varies = 1;
+
+ if (type == error_mark_node)
+ continue;
- if (!flag_isoc99 && pedantic)
- {
- if (TREE_CONSTANT (size))
- pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
- name);
- else
- pedwarn ("ISO C90 forbids variable-size array `%s'",
- name);
- }
- }
+ /* If size was specified, set ITYPE to a range-type for
+ that size. Otherwise, ITYPE remains null. finish_decl
+ may figure it out from an initial value. */
- if (integer_zerop (size))
- {
- /* A zero-length array cannot be represented with an
- unsigned index type, which is what we'll get with
- build_index_type. Create an open-ended range instead. */
- itype = build_range_type (sizetype, size, NULL_TREE);
- }
- else
- {
- /* Compute the maximum valid index, that is, size - 1.
- Do the calculation in index_type, so that if it is
- a variable the computations will be done in the
- proper mode. */
- itype = fold (build (MINUS_EXPR, index_type,
- convert (index_type, size),
- convert (index_type, size_one_node)));
-
- /* If that overflowed, the array is too big.
- ??? While a size of INT_MAX+1 technically shouldn't
- cause an overflow (because we subtract 1), the overflow
- is recorded during the conversion to index_type, before
- the subtraction. Handling this case seems like an
- unnecessary complication. */
- if (TREE_OVERFLOW (itype))
- {
- error ("size of array `%s' is too large", name);
- type = error_mark_node;
- continue;
- }
+ if (size)
+ {
+ /* Strip NON_LVALUE_EXPRs since we aren't using as an
+ lvalue. */
+ STRIP_TYPE_NOPS (size);
+
+ if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
+ {
+ error ("size of array %qs has non-integer type", name);
+ size = integer_one_node;
+ }
+
+ if (pedantic && integer_zerop (size))
+ pedwarn ("ISO C forbids zero-size array %qs", name);
+
+ if (TREE_CODE (size) == INTEGER_CST)
+ {
+ constant_expression_warning (size);
+ if (tree_int_cst_sgn (size) < 0)
+ {
+ error ("size of array %qs is negative", name);
+ size = integer_one_node;
+ }
+ }
+ else
+ {
+ /* Make sure the array size remains visibly
+ nonconstant even if it is (eg) a const variable
+ with known value. */
+ size_varies = 1;
+
+ if (!flag_isoc99 && pedantic)
+ {
+ if (TREE_CONSTANT (size))
+ pedwarn ("ISO C90 forbids array %qs whose size "
+ "can%'t be evaluated",
+ name);
+ else
+ pedwarn ("ISO C90 forbids variable-size array %qs",
+ name);
+ }
+ }
- if (size_varies)
- {
- /* We must be able to distinguish the
- SAVE_EXPR_CONTEXT for the variably-sized type
- so that we can set it correctly in
- set_save_expr_context. The convention is
- that all SAVE_EXPRs that need to be reset
- have NULL_TREE for their SAVE_EXPR_CONTEXT. */
- tree cfd = current_function_decl;
- if (decl_context == PARM)
- current_function_decl = NULL_TREE;
+ if (integer_zerop (size))
+ {
+ /* A zero-length array cannot be represented with
+ an unsigned index type, which is what we'll
+ get with build_index_type. Create an
+ open-ended range instead. */
+ itype = build_range_type (sizetype, size, NULL_TREE);
+ }
+ else
+ {
+ /* Compute the maximum valid index, that is, size
+ - 1. Do the calculation in index_type, so that
+ if it is a variable the computations will be
+ done in the proper mode. */
+ itype = fold (build2 (MINUS_EXPR, index_type,
+ convert (index_type, size),
+ convert (index_type,
+ size_one_node)));
+
+ /* If that overflowed, the array is too big. ???
+ While a size of INT_MAX+1 technically shouldn't
+ cause an overflow (because we subtract 1), the
+ overflow is recorded during the conversion to
+ index_type, before the subtraction. Handling
+ this case seems like an unnecessary
+ complication. */
+ if (TREE_OVERFLOW (itype))
+ {
+ error ("size of array %qs is too large", name);
+ type = error_mark_node;
+ continue;
+ }
+
+ if (size_varies)
itype = variable_size (itype);
- if (decl_context == PARM)
- current_function_decl = cfd;
- }
- itype = build_index_type (itype);
- }
- }
- else if (decl_context == FIELD)
- {
- if (pedantic && !flag_isoc99 && !in_system_header)
- pedwarn ("ISO C90 does not support flexible array members");
-
- /* ISO C99 Flexible array members are effectively identical
- to GCC's zero-length array extension. */
- itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
- }
-
- /* If pedantic, complain about arrays of incomplete types. */
+ itype = build_index_type (itype);
+ }
+ }
+ else if (decl_context == FIELD)
+ {
+ if (pedantic && !flag_isoc99 && !in_system_header)
+ pedwarn ("ISO C90 does not support flexible array members");
- if (pedantic && !COMPLETE_TYPE_P (type))
- pedwarn ("array type has incomplete element type");
+ /* ISO C99 Flexible array members are effectively
+ identical to GCC's zero-length array extension. */
+ itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
+ }
- /* Build the array type itself, then merge any constancy or
- volatility into the target type. We must do it in this order
- to ensure that the TYPE_MAIN_VARIANT field of the array type
- is set correctly. */
+ /* If pedantic, complain about arrays of incomplete types. */
+ if (pedantic && !COMPLETE_TYPE_P (type))
+ pedwarn ("array type has incomplete element type");
- type = build_array_type (type, itype);
- if (type_quals)
- type = c_build_qualified_type (type, type_quals);
+ /* Build the array type itself, then merge any constancy
+ or volatility into the target type. We must do it in
+ this order to ensure that the TYPE_MAIN_VARIANT field
+ of the array type is set correctly. */
+ type = build_array_type (type, itype);
+ if (type_quals)
+ type = c_build_qualified_type (type, type_quals);
- if (size_varies)
- C_TYPE_VARIABLE_SIZE (type) = 1;
+ if (size_varies)
+ C_TYPE_VARIABLE_SIZE (type) = 1;
- /* The GCC extension for zero-length arrays differs from
- ISO flexible array members in that sizeof yields zero. */
- if (size && integer_zerop (size))
- {
+ /* The GCC extension for zero-length arrays differs from
+ ISO flexible array members in that sizeof yields
+ zero. */
+ if (size && integer_zerop (size))
+ {
+ layout_type (type);
+ TYPE_SIZE (type) = bitsize_zero_node;
+ TYPE_SIZE_UNIT (type) = size_zero_node;
+ }
+ else if (declarator->kind == cdk_pointer)
+ /* We can never complete an array type which is the
+ target of a pointer, so go ahead and lay it out. */
layout_type (type);
- TYPE_SIZE (type) = bitsize_zero_node;
- TYPE_SIZE_UNIT (type) = size_zero_node;
- }
- if (decl_context != PARM
- && (array_ptr_quals != NULL_TREE || array_parm_static))
- {
- error ("static or type qualifiers in non-parameter array declarator");
- array_ptr_quals = NULL_TREE;
- array_parm_static = 0;
- }
- }
- else if (TREE_CODE (declarator) == CALL_EXPR)
- {
- tree arg_types;
- /* Declaring a function type.
- Make sure we have a valid type for the function to return. */
- if (type == error_mark_node)
- continue;
+ if (decl_context != PARM
+ && (array_ptr_quals != TYPE_UNQUALIFIED
+ || array_ptr_attrs != NULL_TREE
+ || array_parm_static))
+ {
+ error ("static or type qualifiers in non-parameter array declarator");
+ array_ptr_quals = TYPE_UNQUALIFIED;
+ array_ptr_attrs = NULL_TREE;
+ array_parm_static = 0;
+ }
+ break;
+ }
+ case cdk_function:
+ {
+ /* Say it's a definition only for the declarator closest
+ to the identifier, apart possibly from some
+ attributes. */
+ bool really_funcdef = false;
+ tree arg_types;
+ if (funcdef_flag)
+ {
+ const struct c_declarator *t = declarator->declarator;
+ while (t->kind == cdk_attrs)
+ t = t->declarator;
+ really_funcdef = (t->kind == cdk_id);
+ }
- size_varies = 0;
+ /* Declaring a function type. Make sure we have a valid
+ type for the function to return. */
+ if (type == error_mark_node)
+ continue;
+
+ size_varies = 0;
- /* Warn about some types functions can't return. */
+ /* Warn about some types functions can't return. */
+ if (TREE_CODE (type) == FUNCTION_TYPE)
+ {
+ error ("%qs declared as function returning a function", name);
+ type = integer_type_node;
+ }
+ if (TREE_CODE (type) == ARRAY_TYPE)
+ {
+ error ("%qs declared as function returning an array", name);
+ type = integer_type_node;
+ }
- if (TREE_CODE (type) == FUNCTION_TYPE)
- {
- error ("`%s' declared as function returning a function", name);
- type = integer_type_node;
- }
- if (TREE_CODE (type) == ARRAY_TYPE)
- {
- error ("`%s' declared as function returning an array", name);
- type = integer_type_node;
- }
+ /* Construct the function type and go to the next
+ inner layer of declarator. */
+ arg_info = declarator->u.arg_info;
+ arg_types = grokparms (arg_info, really_funcdef);
- /* Construct the function type and go to the next
- inner layer of declarator. */
-
- arg_types = grokparms (TREE_OPERAND (declarator, 1),
- funcdef_flag
- /* Say it's a definition
- only for the CALL_EXPR
- closest to the identifier. */
- && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
- /* Type qualifiers before the return type of the function
- qualify the return type, not the function type. */
- if (type_quals)
+ /* Type qualifiers before the return type of the function
+ qualify the return type, not the function type. */
+ if (type_quals)
+ {
+ /* Type qualifiers on a function return type are
+ normally permitted by the standard but have no
+ effect, so give a warning at -Wreturn-type.
+ Qualifiers on a void return type are banned on
+ function definitions in ISO C; GCC used to used
+ them for noreturn functions. */
+ if (VOID_TYPE_P (type) && really_funcdef)
+ pedwarn ("function definition has qualified void return type");
+ else if (warn_return_type)
+ warning ("type qualifiers ignored on function return type");
+
+ type = c_build_qualified_type (type, type_quals);
+ }
+ type_quals = TYPE_UNQUALIFIED;
+
+ type = build_function_type (type, arg_types);
+ declarator = declarator->declarator;
+
+ /* Set the TYPE_CONTEXTs for each tagged type which is local to
+ the formal parameter list of this FUNCTION_TYPE to point to
+ the FUNCTION_TYPE node itself. */
{
- /* Type qualifiers on a function return type are normally
- permitted by the standard but have no effect, so give a
- warning at -Wextra. Qualifiers on a void return type have
- meaning as a GNU extension, and are banned on function
- definitions in ISO C. FIXME: strictly we shouldn't
- pedwarn for qualified void return types except on function
- definitions, but not doing so could lead to the undesirable
- state of a "volatile void" function return type not being
- warned about, and a use of the function being compiled
- with GNU semantics, with no diagnostics under -pedantic. */
- if (VOID_TYPE_P (type) && pedantic && !in_system_header)
- pedwarn ("ISO C forbids qualified void function return type");
- else if (extra_warnings
- && !(VOID_TYPE_P (type)
- && type_quals == TYPE_QUAL_VOLATILE))
- warning ("type qualifiers ignored on function return type");
-
- type = c_build_qualified_type (type, type_quals);
+ tree link;
+
+ for (link = arg_info->tags;
+ link;
+ link = TREE_CHAIN (link))
+ TYPE_CONTEXT (TREE_VALUE (link)) = type;
}
- type_quals = TYPE_UNQUALIFIED;
-
- type = build_function_type (type, arg_types);
- declarator = TREE_OPERAND (declarator, 0);
-
- /* Set the TYPE_CONTEXTs for each tagged type which is local to
- the formal parameter list of this FUNCTION_TYPE to point to
- the FUNCTION_TYPE node itself. */
-
- {
- tree link;
-
- for (link = last_function_parm_tags;
- link;
- link = TREE_CHAIN (link))
- TYPE_CONTEXT (TREE_VALUE (link)) = type;
+ break;
}
- }
- else if (TREE_CODE (declarator) == INDIRECT_REF)
- {
- /* Merge any constancy or volatility into the target type
- for the pointer. */
-
- if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
- && type_quals)
- pedwarn ("ISO C forbids qualified function types");
- if (type_quals)
- type = c_build_qualified_type (type, type_quals);
- type_quals = TYPE_UNQUALIFIED;
- size_varies = 0;
-
- type = build_pointer_type (type);
-
- /* Process a list of type modifier keywords
- (such as const or volatile) that were given inside the `*'. */
-
- if (TREE_TYPE (declarator))
- {
- tree typemodlist;
- int erred = 0;
-
- constp = 0;
- volatilep = 0;
- restrictp = 0;
- for (typemodlist = TREE_TYPE (declarator); typemodlist;
- typemodlist = TREE_CHAIN (typemodlist))
- {
- tree qualifier = TREE_VALUE (typemodlist);
+ case cdk_pointer:
+ {
+ /* Merge any constancy or volatility into the target type
+ for the pointer. */
- if (C_IS_RESERVED_WORD (qualifier))
- {
- if (C_RID_CODE (qualifier) == RID_CONST)
- constp++;
- else if (C_RID_CODE (qualifier) == RID_VOLATILE)
- volatilep++;
- else if (C_RID_CODE (qualifier) == RID_RESTRICT)
- restrictp++;
- else
- erred++;
- }
- else
- erred++;
- }
+ if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
+ && type_quals)
+ pedwarn ("ISO C forbids qualified function types");
+ if (type_quals)
+ type = c_build_qualified_type (type, type_quals);
+ size_varies = 0;
- if (erred)
- error ("invalid type modifier within pointer declarator");
- if (constp > 1 && ! flag_isoc99)
- pedwarn ("duplicate `const'");
- if (volatilep > 1 && ! flag_isoc99)
- pedwarn ("duplicate `volatile'");
- if (restrictp > 1 && ! flag_isoc99)
- pedwarn ("duplicate `restrict'");
-
- type_quals = ((constp ? TYPE_QUAL_CONST : 0)
- | (restrictp ? TYPE_QUAL_RESTRICT : 0)
- | (volatilep ? TYPE_QUAL_VOLATILE : 0));
- }
+ type = build_pointer_type (type);
+
+ /* Process type qualifiers (such as const or volatile)
+ that were given inside the `*'. */
+ type_quals = declarator->u.pointer_quals;
- declarator = TREE_OPERAND (declarator, 0);
+ declarator = declarator->declarator;
+ break;
+ }
+ default:
+ gcc_unreachable ();
}
- else
- abort ();
-
}
/* Now TYPE has the actual type. */
&& COMPLETE_TYPE_P (type)
&& TREE_OVERFLOW (TYPE_SIZE (type)))
{
- error ("size of array `%s' is too large", name);
+ error ("size of array %qs is too large", name);
/* If we proceed with the array type as it is, we'll eventually
crash in tree_low_cst(). */
type = error_mark_node;
/* If this is declaring a typedef name, return a TYPE_DECL. */
- if (specbits & (1 << (int) RID_TYPEDEF))
+ if (storage_class == csc_typedef)
{
tree decl;
- /* Note that the grammar rejects storage classes
- in typenames, fields or parameters */
if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
&& type_quals)
pedwarn ("ISO C forbids qualified function types");
if (type_quals)
type = c_build_qualified_type (type, type_quals);
- decl = build_decl (TYPE_DECL, declarator, type);
- if ((specbits & (1 << (int) RID_SIGNED))
- || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
+ decl = build_decl (TYPE_DECL, declarator->u.id, type);
+ if (declspecs->explicit_signed_p)
C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
decl_attributes (&decl, returned_attrs, 0);
+ if (declspecs->inline_p)
+ pedwarn ("%Jtypedef %qD declared %<inline%>", decl, decl);
return decl;
}
if (decl_context == TYPENAME)
{
- /* Note that the grammar rejects storage classes
- in typenames, fields or parameters */
+ /* Note that the grammar rejects storage classes in typenames
+ and fields. */
+ gcc_assert (storage_class == csc_none && !threadp
+ && !declspecs->inline_p);
if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
&& type_quals)
pedwarn ("ISO C forbids const or volatile function types");
a better error message can be made later. */
if (VOID_TYPE_P (type) && decl_context != PARM
- && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
- && ((specbits & (1 << (int) RID_EXTERN))
- || (current_binding_level == global_binding_level
- && !(specbits
- & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
+ && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
+ && (storage_class == csc_extern
+ || (current_scope == file_scope
+ && !(storage_class == csc_static
+ || storage_class == csc_register)))))
{
- error ("variable or field `%s' declared void", name);
+ error ("variable or field %qs declared void", name);
type = integer_type_node;
}
if (type_quals)
type = c_build_qualified_type (type, type_quals);
type = build_pointer_type (type);
- type_quals = TYPE_UNQUALIFIED;
- if (array_ptr_quals)
- {
- tree new_ptr_quals, new_ptr_attrs;
- int erred = 0;
- split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
- /* We don't yet implement attributes in this context. */
- if (new_ptr_attrs != NULL_TREE)
- warning ("attributes in parameter array declarator ignored");
-
- constp = 0;
- volatilep = 0;
- restrictp = 0;
- for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
- {
- tree qualifier = TREE_VALUE (new_ptr_quals);
+ type_quals = array_ptr_quals;
- if (C_IS_RESERVED_WORD (qualifier))
- {
- if (C_RID_CODE (qualifier) == RID_CONST)
- constp++;
- else if (C_RID_CODE (qualifier) == RID_VOLATILE)
- volatilep++;
- else if (C_RID_CODE (qualifier) == RID_RESTRICT)
- restrictp++;
- else
- erred++;
- }
- else
- erred++;
- }
+ /* We don't yet implement attributes in this context. */
+ if (array_ptr_attrs != NULL_TREE)
+ warning ("attributes in parameter array declarator ignored");
- if (erred)
- error ("invalid type modifier within array declarator");
-
- type_quals = ((constp ? TYPE_QUAL_CONST : 0)
- | (restrictp ? TYPE_QUAL_RESTRICT : 0)
- | (volatilep ? TYPE_QUAL_VOLATILE : 0));
- }
size_varies = 0;
}
else if (TREE_CODE (type) == FUNCTION_TYPE)
type_as_written = type;
- decl = build_decl (PARM_DECL, declarator, type);
+ decl = build_decl (PARM_DECL, declarator->u.id, type);
if (size_varies)
C_DECL_VARIABLE_SIZE (decl) = 1;
DECL_ARG_TYPE (decl) = promoted_type;
DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
+ if (declspecs->inline_p)
+ pedwarn ("%Jparameter %qD declared %<inline%>", decl, decl);
}
else if (decl_context == FIELD)
{
+ /* Note that the grammar rejects storage classes in typenames
+ and fields. */
+ gcc_assert (storage_class == csc_none && !threadp
+ && !declspecs->inline_p);
+
/* Structure field. It may not be a function. */
if (TREE_CODE (type) == FUNCTION_TYPE)
{
- error ("field `%s' declared as a function", name);
+ error ("field %qs declared as a function", name);
type = build_pointer_type (type);
}
else if (TREE_CODE (type) != ERROR_MARK
&& !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
{
- error ("field `%s' has incomplete type", name);
+ error ("field %qs has incomplete type", name);
type = error_mark_node;
}
/* Move type qualifiers down to element of an array. */
if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
- {
- type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
- type_quals),
- TYPE_DOMAIN (type));
- }
- decl = build_decl (FIELD_DECL, declarator, type);
+ type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
+ type_quals),
+ TYPE_DOMAIN (type));
+ decl = build_decl (FIELD_DECL, declarator->u.id, type);
DECL_NONADDRESSABLE_P (decl) = bitfield;
if (size_varies)
}
else if (TREE_CODE (type) == FUNCTION_TYPE)
{
- /* Every function declaration is "external"
- except for those which are inside a function body
- in which `auto' is used.
- That is a case not specified by ANSI C,
- and we use it for forward declarations for nested functions. */
- int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
- || current_binding_level == global_binding_level);
-
- if (specbits & (1 << (int) RID_AUTO)
- && (pedantic || current_binding_level == global_binding_level))
- pedwarn ("invalid storage class for function `%s'", name);
- if (specbits & (1 << (int) RID_REGISTER))
- error ("invalid storage class for function `%s'", name);
- if (specbits & (1 << (int) RID_THREAD))
- error ("invalid storage class for function `%s'", name);
- /* Function declaration not at top level.
- Storage classes other than `extern' are not allowed
- and `extern' makes no difference. */
- if (current_binding_level != global_binding_level
- && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
- && pedantic)
- pedwarn ("invalid storage class for function `%s'", name);
-
- decl = build_decl (FUNCTION_DECL, declarator, type);
+ if (storage_class == csc_register || threadp)
+ error ("invalid storage class for function %qs", name);
+ else if (current_scope != file_scope)
+ {
+ /* Function declaration not at file scope. Storage
+ classes other than `extern' are not allowed, C99
+ 6.7.1p5, and `extern' makes no difference. However,
+ GCC allows 'auto', perhaps with 'inline', to support
+ nested functions. */
+ if (storage_class == csc_auto)
+ {
+ if (pedantic)
+ pedwarn ("invalid storage class for function %qs", name);
+ }
+ if (storage_class == csc_static)
+ error ("invalid storage class for function %qs", name);
+ }
+
+ decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
decl = build_decl_attribute_variant (decl, decl_attr);
- DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
- ggc_alloc_cleared (sizeof (struct lang_decl));
+ DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
- if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
+ if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
pedwarn ("ISO C forbids qualified function types");
- /* GNU C interprets a `volatile void' return type to indicate
+ /* GNU C interprets a volatile-qualified function type to indicate
that the function does not return. */
if ((type_quals & TYPE_QUAL_VOLATILE)
&& !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
- warning ("`noreturn' function returns non-void value");
-
- if (extern_ref)
+ warning ("%<noreturn%> function returns non-void value");
+
+ /* Every function declaration is an external reference
+ (DECL_EXTERNAL) except for those which are not at file
+ scope and are explicitly declared "auto". This is
+ forbidden by standard C (C99 6.7.1p5) and is interpreted by
+ GCC to signify a forward declaration of a nested function. */
+ if (storage_class == csc_auto && current_scope != file_scope)
+ DECL_EXTERNAL (decl) = 0;
+ else
DECL_EXTERNAL (decl) = 1;
+
/* Record absence of global scope for `static' or `auto'. */
TREE_PUBLIC (decl)
- = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
+ = !(storage_class == csc_static || storage_class == csc_auto);
+
+ /* For a function definition, record the argument information
+ block where store_parm_decls will look for it. */
+ if (funcdef_flag)
+ current_function_arg_info = arg_info;
- if (defaulted_int)
+ if (declspecs->default_int_p)
C_FUNCTION_IMPLICIT_INT (decl) = 1;
/* Record presence of `inline', if it is reasonable. */
- if (MAIN_NAME_P (declarator))
+ if (flag_hosted && MAIN_NAME_P (declarator->u.id))
{
- if (inlinep)
- warning ("cannot inline function `main'");
+ if (declspecs->inline_p)
+ pedwarn ("cannot inline function %<main%>");
}
- else if (inlinep)
+ else if (declspecs->inline_p)
{
- /* Assume that otherwise the function can be inlined. */
+ /* Record that the function is declared `inline'. */
DECL_DECLARED_INLINE_P (decl) = 1;
/* Do not mark bare declarations as DECL_INLINE. Doing so
if (initialized)
{
DECL_INLINE (decl) = 1;
- if (specbits & (1 << (int) RID_EXTERN))
+ if (storage_class == csc_extern)
current_extern_inline = 1;
}
}
two things: let the function be deferred until it is actually
needed, and let dwarf2 know that the function is inlinable. */
else if (flag_inline_trees == 2 && initialized)
- {
- if (!DECL_INLINE (decl))
- DID_INLINE_FUNC (decl) = 1;
- DECL_INLINE (decl) = 1;
- DECL_DECLARED_INLINE_P (decl) = 0;
- }
+ DECL_INLINE (decl) = 1;
}
else
{
/* It's a variable. */
/* An uninitialized decl with `extern' is a reference. */
- int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
+ int extern_ref = !initialized && storage_class == csc_extern;
/* Move type qualifiers down to element of an array. */
if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
else if (type_quals)
type = c_build_qualified_type (type, type_quals);
- /* It is invalid to create an `extern' declaration for a
+ /* C99 6.2.2p7: It is invalid (compile-time undefined
+ behavior) to create an 'extern' declaration for a
variable if there is a global declaration that is
- `static'. */
- if (extern_ref && current_binding_level != global_binding_level)
+ 'static' and the global declaration is not visible.
+ (If the static declaration _is_ currently visible,
+ the 'extern' declaration is taken to refer to that decl.) */
+ if (extern_ref && current_scope != file_scope)
{
- tree global_decl;
+ tree global_decl = identifier_global_value (declarator->u.id);
+ tree visible_decl = lookup_name (declarator->u.id);
- global_decl = identifier_global_value (declarator);
if (global_decl
+ && global_decl != visible_decl
&& TREE_CODE (global_decl) == VAR_DECL
&& !TREE_PUBLIC (global_decl))
- error ("variable previously declared `static' redeclared "
- "`extern'");
+ error ("variable previously declared %<static%> redeclared "
+ "%<extern%>");
}
- decl = build_decl (VAR_DECL, declarator, type);
+ decl = build_decl (VAR_DECL, declarator->u.id, type);
if (size_varies)
C_DECL_VARIABLE_SIZE (decl) = 1;
- if (inlinep)
- pedwarn_with_decl (decl, "variable `%s' declared `inline'");
+ if (declspecs->inline_p)
+ pedwarn ("%Jvariable %qD declared %<inline%>", decl, decl);
- DECL_EXTERNAL (decl) = extern_ref;
+ /* At file scope, an initialized extern declaration may follow
+ a static declaration. In that case, DECL_EXTERNAL will be
+ reset later in start_decl. */
+ DECL_EXTERNAL (decl) = (storage_class == csc_extern);
- /* At top level, the presence of a `static' or `register' storage
+ /* At file scope, the presence of a `static' or `register' storage
class specifier, or the absence of all storage class specifiers
makes this declaration a definition (perhaps tentative). Also,
the absence of both `static' and `register' makes it public. */
- if (current_binding_level == global_binding_level)
+ if (current_scope == file_scope)
{
- TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
- | (1 << (int) RID_REGISTER)));
+ TREE_PUBLIC (decl) = !(storage_class == csc_static
+ || storage_class == csc_register);
TREE_STATIC (decl) = !extern_ref;
}
- /* Not at top level, only `static' makes a static definition. */
+ /* Not at file scope, only `static' makes a static definition. */
else
{
- TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
+ TREE_STATIC (decl) = (storage_class == csc_static);
TREE_PUBLIC (decl) = extern_ref;
}
- if (specbits & 1 << (int) RID_THREAD)
+ if (threadp)
{
if (targetm.have_tls)
DECL_THREAD_LOCAL (decl) = 1;
/* Record `register' declaration for warnings on &
and in case doing stupid register allocation. */
- if (specbits & (1 << (int) RID_REGISTER))
- DECL_REGISTER (decl) = 1;
+ if (storage_class == csc_register)
+ {
+ C_DECL_REGISTER (decl) = 1;
+ DECL_REGISTER (decl) = 1;
+ }
/* Record constancy and volatility. */
c_apply_type_quals_to_decl (type_quals, decl);
Otherwise, the fact that those components are volatile
will be ignored, and would even crash the compiler. */
if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
- c_mark_addressable (decl);
+ {
+ /* It is not an error for a structure with volatile fields to
+ be declared register, but reset DECL_REGISTER since it
+ cannot actually go in a register. */
+ int was_reg = C_DECL_REGISTER (decl);
+ C_DECL_REGISTER (decl) = 0;
+ DECL_REGISTER (decl) = 0;
+ c_mark_addressable (decl);
+ C_DECL_REGISTER (decl) = was_reg;
+ }
+
+ /* This is the earliest point at which we might know the assembler
+ name of a variable. Thus, if it's known before this, die horribly. */
+ gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
decl_attributes (&decl, returned_attrs, 0);
of calls is different. The last call to `grokparms' is always the one
that contains the formal parameter names of a function definition.
- Store in `last_function_parms' a chain of the decls of parms.
- Also store in `last_function_parm_tags' a chain of the struct, union,
- and enum tags declared among the parms.
-
Return a list of arg types to use in the FUNCTION_TYPE for this function.
- FUNCDEF_FLAG is nonzero for a function definition, 0 for
+ FUNCDEF_FLAG is true for a function definition, false for
a mere declaration. A nonempty identifier-list gets an error message
- when FUNCDEF_FLAG is zero. */
+ when FUNCDEF_FLAG is false. */
static tree
-grokparms (tree parms_info, int funcdef_flag)
+grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
{
- tree first_parm = TREE_CHAIN (parms_info);
-
- last_function_parms = TREE_PURPOSE (parms_info);
- last_function_parm_tags = TREE_VALUE (parms_info);
+ tree arg_types = arg_info->types;
- if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
+ if (warn_strict_prototypes && arg_types == 0 && !funcdef_flag
&& !in_system_header)
- warning ("function declaration isn't a prototype");
+ warning ("function declaration isn%'t a prototype");
- if (first_parm != 0
- && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
+ if (arg_types == error_mark_node)
+ return 0; /* don't set TYPE_ARG_TYPES in this case */
+
+ else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
{
- if (! funcdef_flag)
+ if (!funcdef_flag)
pedwarn ("parameter names (without types) in function declaration");
- last_function_parms = first_parm;
+ arg_info->parms = arg_info->types;
+ arg_info->types = 0;
return 0;
}
else
{
- tree parm;
- tree typelt;
- /* If the arg types are incomplete in a declaration,
- they must include undefined tags.
- These tags can never be defined in the scope of the declaration,
- so the types can never be completed,
- and no call can be compiled successfully. */
- for (parm = last_function_parms, typelt = first_parm;
+ tree parm, type, typelt;
+ unsigned int parmno;
+
+ /* If there is a parameter of incomplete type in a definition,
+ this is an error. In a declaration this is valid, and a
+ struct or union type may be completed later, before any calls
+ or definition of the function. In the case where the tag was
+ first declared within the parameter list, a warning has
+ already been given. If a parameter has void type, then
+ however the function cannot be defined or called, so
+ warn. */
+
+ for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
parm;
- parm = TREE_CHAIN (parm))
- /* Skip over any enumeration constants declared here. */
- if (TREE_CODE (parm) == PARM_DECL)
- {
- /* Barf if the parameter itself has an incomplete type. */
- tree type = TREE_VALUE (typelt);
- if (type == error_mark_node)
- continue;
- if (!COMPLETE_TYPE_P (type))
- {
- if (funcdef_flag && DECL_NAME (parm) != 0)
- error ("parameter `%s' has incomplete type",
- IDENTIFIER_POINTER (DECL_NAME (parm)));
- else
- warning ("parameter has incomplete type");
- if (funcdef_flag)
- {
- TREE_VALUE (typelt) = error_mark_node;
- TREE_TYPE (parm) = error_mark_node;
- }
- }
- typelt = TREE_CHAIN (typelt);
- }
+ parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
+ {
+ type = TREE_VALUE (typelt);
+ if (type == error_mark_node)
+ continue;
- return first_parm;
+ if (!COMPLETE_TYPE_P (type))
+ {
+ if (funcdef_flag)
+ {
+ if (DECL_NAME (parm))
+ error ("%Jparameter %u (%qD) has incomplete type",
+ parm, parmno, parm);
+ else
+ error ("%Jparameter %u has incomplete type",
+ parm, parmno);
+
+ TREE_VALUE (typelt) = error_mark_node;
+ TREE_TYPE (parm) = error_mark_node;
+ }
+ else if (VOID_TYPE_P (type))
+ {
+ if (DECL_NAME (parm))
+ warning ("%Jparameter %u (%qD) has void type",
+ parm, parmno, parm);
+ else
+ warning ("%Jparameter %u has void type",
+ parm, parmno);
+ }
+ }
+ }
+ return arg_types;
}
}
-/* Return a tree_list node with info on a parameter list just parsed.
- The TREE_PURPOSE is a chain of decls of those parms.
- The TREE_VALUE is a list of structure, union and enum tags defined.
- The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
- This tree_list node is later fed to `grokparms'.
+/* Take apart the current scope and return a c_arg_info structure with
+ info on a parameter list just parsed.
- VOID_AT_END nonzero means append `void' to the end of the type-list.
- Zero means the parmlist ended with an ellipsis so don't append `void'. */
+ This structure is later fed to 'grokparms' and 'store_parm_decls'.
-tree
-get_parm_info (int void_at_end)
+ ELLIPSIS being true means the argument list ended in '...' so don't
+ append a sentinel (void_list_node) to the end of the type-list. */
+
+struct c_arg_info *
+get_parm_info (bool ellipsis)
{
- tree decl, t;
- tree types = 0;
- int erred = 0;
- tree tags = gettags ();
- tree parms = getdecls ();
- tree new_parms = 0;
- tree order = current_binding_level->parm_order;
-
- /* Just `void' (and no ellipsis) is special. There are really no parms.
- But if the `void' is qualified (by `const' or `volatile') or has a
- storage class specifier (`register'), then the behavior is undefined;
- by not counting it as the special case of `void' we will cause an
- error later. Typedefs for `void' are OK (see DR#157). */
- if (void_at_end && parms != 0
- && TREE_CHAIN (parms) == 0
- && VOID_TYPE_P (TREE_TYPE (parms))
- && ! TREE_THIS_VOLATILE (parms)
- && ! TREE_READONLY (parms)
- && ! DECL_REGISTER (parms)
- && DECL_NAME (parms) == 0)
- {
- parms = NULL_TREE;
- storedecls (NULL_TREE);
- return tree_cons (NULL_TREE, NULL_TREE,
- tree_cons (NULL_TREE, void_type_node, NULL_TREE));
- }
-
- /* Extract enumerator values and other non-parms declared with the parms.
- Likewise any forward parm decls that didn't have real parm decls. */
- for (decl = parms; decl;)
- {
- tree next = TREE_CHAIN (decl);
-
- if (TREE_CODE (decl) != PARM_DECL)
- {
- TREE_CHAIN (decl) = new_parms;
- new_parms = decl;
- }
- else if (TREE_ASM_WRITTEN (decl))
- {
- error_with_decl (decl,
- "parameter `%s' has just a forward declaration");
- TREE_CHAIN (decl) = new_parms;
- new_parms = decl;
- }
- decl = next;
+ struct c_binding *b = current_scope->bindings;
+ struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
+ struct c_arg_info);
+ tree parms = 0;
+ tree tags = 0;
+ tree types = 0;
+ tree others = 0;
+
+ static bool explained_incomplete_types = false;
+ bool gave_void_only_once_err = false;
+
+ arg_info->parms = 0;
+ arg_info->tags = 0;
+ arg_info->types = 0;
+ arg_info->others = 0;
+
+ /* The bindings in this scope must not get put into a block.
+ We will take care of deleting the binding nodes. */
+ current_scope->bindings = 0;
+
+ /* This function is only called if there was *something* on the
+ parameter list. */
+ gcc_assert (b);
+
+ /* A parameter list consisting solely of 'void' indicates that the
+ function takes no arguments. But if the 'void' is qualified
+ (by 'const' or 'volatile'), or has a storage class specifier
+ ('register'), then the behavior is undefined; issue an error.
+ Typedefs for 'void' are OK (see DR#157). */
+ if (b->prev == 0 /* one binding */
+ && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
+ && !DECL_NAME (b->decl) /* anonymous */
+ && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
+ {
+ if (TREE_THIS_VOLATILE (b->decl)
+ || TREE_READONLY (b->decl)
+ || C_DECL_REGISTER (b->decl))
+ error ("%<void%> as only parameter may not be qualified");
+
+ /* There cannot be an ellipsis. */
+ if (ellipsis)
+ error ("%<void%> must be the only parameter");
+
+ arg_info->types = void_list_node;
+ return arg_info;
}
- /* Put the parm decls back in the order they were in in the parm list. */
- for (t = order; t; t = TREE_CHAIN (t))
+ if (!ellipsis)
+ types = void_list_node;
+
+ /* Break up the bindings list into parms, tags, types, and others;
+ apply sanity checks; purge the name-to-decl bindings. */
+ while (b)
{
- if (TREE_CHAIN (t))
- TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
- else
- TREE_CHAIN (TREE_VALUE (t)) = 0;
- }
+ tree decl = b->decl;
+ tree type = TREE_TYPE (decl);
+ const char *keyword;
- new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
- new_parms);
+ switch (TREE_CODE (decl))
+ {
+ case PARM_DECL:
+ if (b->id)
+ {
+ gcc_assert (I_SYMBOL_BINDING (b->id) == b);
+ I_SYMBOL_BINDING (b->id) = b->shadowed;
+ }
- /* Store the parmlist in the binding level since the old one
- is no longer a valid list. (We have changed the chain pointers.) */
- storedecls (new_parms);
+ /* Check for forward decls that never got their actual decl. */
+ if (TREE_ASM_WRITTEN (decl))
+ error ("%Jparameter %qD has just a forward declaration",
+ decl, decl);
+ /* Check for (..., void, ...) and issue an error. */
+ else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
+ {
+ if (!gave_void_only_once_err)
+ {
+ error ("%<void%> must be the only parameter");
+ gave_void_only_once_err = true;
+ }
+ }
+ else
+ {
+ /* Valid parameter, add it to the list. */
+ TREE_CHAIN (decl) = parms;
+ parms = decl;
+
+ /* Since there is a prototype, args are passed in their
+ declared types. The back end may override this later. */
+ DECL_ARG_TYPE (decl) = type;
+ types = tree_cons (0, type, types);
+ }
+ break;
- for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
- /* There may also be declarations for enumerators if an enumeration
- type is declared among the parms. Ignore them here. */
- if (TREE_CODE (decl) == PARM_DECL)
- {
- /* Since there is a prototype,
- args are passed in their declared types. */
- tree type = TREE_TYPE (decl);
- DECL_ARG_TYPE (decl) = type;
- if (PROMOTE_PROTOTYPES
- && INTEGRAL_TYPE_P (type)
- && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
- DECL_ARG_TYPE (decl) = integer_type_node;
-
- types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
- if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
- && DECL_NAME (decl) == 0)
- {
- error ("`void' in parameter list must be the entire list");
- erred = 1;
- }
- }
+ case ENUMERAL_TYPE: keyword = "enum"; goto tag;
+ case UNION_TYPE: keyword = "union"; goto tag;
+ case RECORD_TYPE: keyword = "struct"; goto tag;
+ tag:
+ /* Types may not have tag-names, in which case the type
+ appears in the bindings list with b->id NULL. */
+ if (b->id)
+ {
+ gcc_assert (I_TAG_BINDING (b->id) == b);
+ I_TAG_BINDING (b->id) = b->shadowed;
+ }
- if (void_at_end)
- return tree_cons (new_parms, tags,
- nreverse (tree_cons (NULL_TREE, void_type_node, types)));
+ /* Warn about any struct, union or enum tags defined in a
+ parameter list. The scope of such types is limited to
+ the parameter list, which is rarely if ever desirable
+ (it's impossible to call such a function with type-
+ correct arguments). An anonymous union parm type is
+ meaningful as a GNU extension, so don't warn for that. */
+ if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
+ {
+ if (b->id)
+ /* The %s will be one of 'struct', 'union', or 'enum'. */
+ warning ("%<%s %E%> declared inside parameter list",
+ keyword, b->id);
+ else
+ /* The %s will be one of 'struct', 'union', or 'enum'. */
+ warning ("anonymous %s declared inside parameter list",
+ keyword);
- return tree_cons (new_parms, tags, nreverse (types));
-}
+ if (!explained_incomplete_types)
+ {
+ warning ("its scope is only this definition or declaration,"
+ " which is probably not what you want");
+ explained_incomplete_types = true;
+ }
+ }
-/* At end of parameter list, warn about any struct, union or enum tags
- defined within. Do so because these types cannot ever become complete. */
+ tags = tree_cons (b->id, decl, tags);
+ break;
-void
-parmlist_tags_warning (void)
-{
- tree elt;
- static int already;
+ case CONST_DECL:
+ case TYPE_DECL:
+ /* CONST_DECLs appear here when we have an embedded enum,
+ and TYPE_DECLs appear here when we have an embedded struct
+ or union. No warnings for this - we already warned about the
+ type itself. */
+ TREE_CHAIN (decl) = others;
+ others = decl;
+ /* fall through */
+
+ case ERROR_MARK:
+ /* error_mark_node appears here when we have an undeclared
+ variable. Just throw it away. */
+ if (b->id)
+ {
+ gcc_assert (I_SYMBOL_BINDING (b->id) == b);
+ I_SYMBOL_BINDING (b->id) = b->shadowed;
+ }
+ break;
- for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
- {
- enum tree_code code = TREE_CODE (TREE_VALUE (elt));
- /* An anonymous union parm type is meaningful as a GNU extension.
- So don't warn for that. */
- if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
- continue;
- if (TREE_PURPOSE (elt) != 0)
- {
- if (code == RECORD_TYPE)
- warning ("`struct %s' declared inside parameter list",
- IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
- else if (code == UNION_TYPE)
- warning ("`union %s' declared inside parameter list",
- IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
- else
- warning ("`enum %s' declared inside parameter list",
- IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
- }
- else
- {
- /* For translation these need to be separate warnings */
- if (code == RECORD_TYPE)
- warning ("anonymous struct declared inside parameter list");
- else if (code == UNION_TYPE)
- warning ("anonymous union declared inside parameter list");
- else
- warning ("anonymous enum declared inside parameter list");
- }
- if (! already)
- {
- warning ("its scope is only this definition or declaration, which is probably not what you want");
- already = 1;
+ /* Other things that might be encountered. */
+ case LABEL_DECL:
+ case FUNCTION_DECL:
+ case VAR_DECL:
+ default:
+ gcc_unreachable ();
}
+
+ b = free_binding_and_advance (b);
}
+
+ arg_info->parms = parms;
+ arg_info->tags = tags;
+ arg_info->types = types;
+ arg_info->others = others;
+ return arg_info;
}
\f
/* Get the struct, enum or union (CODE says which) with tag NAME.
/* If this is the right type of tag, return what we found.
(This reference will be shadowed by shadow_tag later if appropriate.)
If this is the wrong type of tag, do not return it. If it was the
- wrong type in the same binding level, we will have had an error
- message already; if in a different binding level and declaring
+ wrong type in the same scope, we will have had an error
+ message already; if in a different scope and declaring
a name, pending_xref_error will give an error message; but if in a
- different binding level and not declaring a name, this tag should
+ different scope and not declaring a name, this tag should
shadow the previous declaration of a different type of tag, and
this would not work properly if we return the reference found.
(For example, with "struct foo" in an outer scope, "union foo;"
TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
TYPE_USER_ALIGN (ref) = 0;
- TREE_UNSIGNED (ref) = 1;
+ TYPE_UNSIGNED (ref) = 1;
TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
return ref;
}
\f
-/* Make sure that the tag NAME is defined *in the current binding level*
+/* Make sure that the tag NAME is defined *in the current scope*
at least as a forward reference.
CODE says which kind of tag NAME ought to be. */
tree
start_struct (enum tree_code code, tree name)
{
- /* If there is already a tag defined at this binding level
+ /* If there is already a tag defined at this scope
(as a forward reference), just return it. */
tree ref = 0;
ref = lookup_tag (code, name, 1);
if (ref && TREE_CODE (ref) == code)
{
- if (TYPE_FIELDS (ref))
+ if (TYPE_SIZE (ref))
{
if (code == UNION_TYPE)
- error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
+ error ("redefinition of %<union %s%>", IDENTIFIER_POINTER (name));
+ else
+ error ("redefinition of %<struct %s%>", IDENTIFIER_POINTER (name));
+ }
+ else if (C_TYPE_BEING_DEFINED (ref))
+ {
+ if (code == UNION_TYPE)
+ error ("nested redefinition of %<union %s%>",
+ IDENTIFIER_POINTER (name));
else
- error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
+ error ("nested redefinition of %<struct %s%>",
+ IDENTIFIER_POINTER (name));
}
}
else
return ref;
}
-/* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
+/* Process the specs, declarator and width (NULL if omitted)
of a structure component, returning a FIELD_DECL node.
- WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
+ WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
This is done during the parsing of the struct declaration.
The FIELD_DECL nodes are chained together and the lot of them
are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
tree
-grokfield (tree declarator, tree declspecs, tree width)
+grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
+ tree width)
{
tree value;
- if (declarator == NULL_TREE && width == NULL_TREE)
+ if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
+ && width == NULL_TREE)
{
/* This is an unnamed decl.
took this from Plan 9 or if it was an accident of implementation
that took root before someone noticed the bug... */
- tree type = TREE_VALUE (declspecs);
+ tree type = declspecs->type;
+ bool type_ok = (TREE_CODE (type) == RECORD_TYPE
+ || TREE_CODE (type) == UNION_TYPE);
+ bool ok = false;
- if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
- type = TREE_TYPE (type);
- if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
+ if (type_ok
+ && (flag_ms_extensions || !declspecs->typedef_p))
{
if (flag_ms_extensions)
- ; /* ok */
+ ok = true;
else if (flag_iso)
- goto warn_unnamed_field;
+ ok = false;
else if (TYPE_NAME (type) == NULL)
- ; /* ok */
+ ok = true;
else
- goto warn_unnamed_field;
+ ok = false;
}
- else
+ if (!ok)
{
- warn_unnamed_field:
- warning ("declaration does not declare anything");
+ pedwarn ("declaration does not declare anything");
return NULL_TREE;
}
+ if (pedantic)
+ pedwarn ("ISO C doesn't support unnamed structs/unions");
}
- value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
+ value = grokdeclarator (declarator, declspecs, FIELD, false,
+ width ? &width : NULL);
finish_decl (value, NULL_TREE, NULL_TREE);
DECL_INITIAL (value) = width;
- if (c_dialect_objc ())
- objc_check_decl (value);
return value;
}
\f
for (y = fieldlist; y != x; y = TREE_CHAIN (y))
if (DECL_NAME (y) == DECL_NAME (x))
{
- error_with_decl (x, "duplicate member `%s'");
+ error ("%Jduplicate member %qD", x, x);
DECL_NAME (x) = NULL_TREE;
}
}
slot = htab_find_slot (htab, y, INSERT);
if (*slot)
{
- error_with_decl (x, "duplicate member `%s'");
+ error ("%Jduplicate member %qD", x, x);
DECL_NAME (x) = NULL_TREE;
}
*slot = y;
finish_struct (tree t, tree fieldlist, tree attributes)
{
tree x;
- int toplevel = global_binding_level == current_binding_level;
+ bool toplevel = file_scope == current_scope;
int saw_named_field;
/* If this type was previously laid out as a forward reference,
decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
- /* Nameless union parm types are useful as GCC extension. */
- if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
- /* Otherwise, warn about any struct or union def. in parmlist. */
- if (in_parm_level_p ())
- {
- if (pedantic)
- pedwarn ("%s defined inside parms",
- TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
- else
- warning ("%s defined inside parms",
- TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
- }
-
if (pedantic)
{
for (x = fieldlist; x; x = TREE_CHAIN (x))
}
/* Install struct as DECL_CONTEXT of each field decl.
- Also process specified field sizes,m which is found in the DECL_INITIAL.
- Store 0 there, except for ": 0" fields (so we can find them
- and delete them, below). */
+ Also process specified field sizes, found in the DECL_INITIAL,
+ storing 0 there after the type has been changed to precision equal
+ to its width, rather than the precision of the specified standard
+ type. (Correct layout requires the original type to have been preserved
+ until now.) */
saw_named_field = 0;
for (x = fieldlist; x; x = TREE_CHAIN (x))
if (C_DECL_VARIABLE_SIZE (x))
C_TYPE_VARIABLE_SIZE (t) = 1;
- /* Detect invalid nested redefinition. */
- if (TREE_TYPE (x) == t)
- error ("nested redefinition of `%s'",
- IDENTIFIER_POINTER (TYPE_NAME (t)));
-
- /* Detect invalid bit-field size. */
- if (DECL_INITIAL (x))
- STRIP_NOPS (DECL_INITIAL (x));
- if (DECL_INITIAL (x))
- {
- if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
- constant_expression_warning (DECL_INITIAL (x));
- else
- {
- error_with_decl (x,
- "bit-field `%s' width not an integer constant");
- DECL_INITIAL (x) = NULL;
- }
- }
-
- /* Detect invalid bit-field type. */
- if (DECL_INITIAL (x)
- && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
- && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
- && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
- {
- error_with_decl (x, "bit-field `%s' has invalid type");
- DECL_INITIAL (x) = NULL;
- }
-
- if (DECL_INITIAL (x) && pedantic
- && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
- && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
- && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
- /* Accept an enum that's equivalent to int or unsigned int. */
- && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
- && (TYPE_PRECISION (TREE_TYPE (x))
- == TYPE_PRECISION (integer_type_node))))
- pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
-
- /* Detect and ignore out of range field width and process valid
- field widths. */
if (DECL_INITIAL (x))
{
- int max_width
- = (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node
- ? CHAR_TYPE_SIZE : TYPE_PRECISION (TREE_TYPE (x)));
-
- if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
- error_with_decl (x, "negative width in bit-field `%s'");
- else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
- pedwarn_with_decl (x, "width of `%s' exceeds its type");
- else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
- error_with_decl (x, "zero width for bit-field `%s'");
- else
- {
- /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
- unsigned HOST_WIDE_INT width
- = tree_low_cst (DECL_INITIAL (x), 1);
-
- if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
- && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
- TREE_UNSIGNED (TREE_TYPE (x)))
- || (width
- < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
- TREE_UNSIGNED (TREE_TYPE (x))))))
- warning_with_decl (x,
- "`%s' is narrower than values of its type");
-
- DECL_SIZE (x) = bitsize_int (width);
- DECL_BIT_FIELD (x) = 1;
- SET_DECL_C_BIT_FIELD (x);
- }
+ unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
+ DECL_SIZE (x) = bitsize_int (width);
+ DECL_BIT_FIELD (x) = 1;
+ SET_DECL_C_BIT_FIELD (x);
}
- DECL_INITIAL (x) = 0;
-
/* Detect flexible array member in an invalid context. */
if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
&& TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
&& TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
{
if (TREE_CODE (t) == UNION_TYPE)
- error_with_decl (x, "flexible array member in union");
+ {
+ error ("%Jflexible array member in union", x);
+ TREE_TYPE (x) = error_mark_node;
+ }
else if (TREE_CHAIN (x) != NULL_TREE)
- error_with_decl (x, "flexible array member not at end of struct");
- else if (! saw_named_field)
- error_with_decl (x, "flexible array member in otherwise empty struct");
+ {
+ error ("%Jflexible array member not at end of struct", x);
+ TREE_TYPE (x) = error_mark_node;
+ }
+ else if (!saw_named_field)
+ {
+ error ("%Jflexible array member in otherwise empty struct", x);
+ TREE_TYPE (x) = error_mark_node;
+ }
}
- if (pedantic && TREE_CODE (t) == RECORD_TYPE
+ if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
&& flexible_array_type_p (TREE_TYPE (x)))
- pedwarn_with_decl (x, "invalid use of structure with flexible array member");
+ pedwarn ("%Jinvalid use of structure with flexible array member", x);
if (DECL_NAME (x))
saw_named_field = 1;
layout_type (t);
- /* Delete all zero-width bit-fields from the fieldlist */
+ /* Give bit-fields their proper types. */
{
tree *fieldlistp = &fieldlist;
while (*fieldlistp)
- if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
- *fieldlistp = TREE_CHAIN (*fieldlistp);
+ if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
+ && TREE_TYPE (*fieldlistp) != error_mark_node)
+ {
+ unsigned HOST_WIDE_INT width
+ = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
+ tree type = TREE_TYPE (*fieldlistp);
+ if (width != TYPE_PRECISION (type))
+ TREE_TYPE (*fieldlistp)
+ = build_nonstandard_integer_type (width, TYPE_UNSIGNED (type));
+ DECL_INITIAL (*fieldlistp) = 0;
+ }
else
fieldlistp = &TREE_CHAIN (*fieldlistp);
}
TYPE_FIELDS (t) = fieldlist;
/* If there are lots of fields, sort so we can look through them fast.
- We arbitrarily consider 16 or more elts to be "a lot". */
+ We arbitrarily consider 16 or more elts to be "a lot". */
{
int len = 0;
tree *field_array;
struct lang_type *space;
struct sorted_fields_type *space2;
-
+
len += list_length (x);
-
+
/* Use the same allocation policy here that make_node uses, to
ensure that this lives as long as the rest of the struct decl.
All decls in an inline function need to be saved. */
-
- space = ggc_alloc (sizeof (struct lang_type));
- space2 = ggc_alloc (sizeof (struct sorted_fields_type) + len * sizeof (tree));
-
+
+ space = GGC_CNEW (struct lang_type);
+ space2 = GGC_NEWVAR (struct sorted_fields_type,
+ sizeof (struct sorted_fields_type) + len * sizeof (tree));
+
len = 0;
space->s = space2;
field_array = &space2->elts[0];
for (x = fieldlist; x; x = TREE_CHAIN (x))
{
field_array[len++] = x;
-
- /* if there is anonymous struct or union break out of the loop */
+
+ /* If there is anonymous struct or union, break out of the loop. */
if (DECL_NAME (x) == NULL)
break;
}
- /* found no anonymous struct/union add the TYPE_LANG_SPECIFIC. */
+ /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
if (x == NULL)
{
TYPE_LANG_SPECIFIC (t) = space;
}
}
}
-
+
for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
{
TYPE_FIELDS (x) = TYPE_FIELDS (t);
{
TYPE_TRANSPARENT_UNION (t) = 0;
warning ("union cannot be made transparent");
- }
-
- /* If this structure or union completes the type of any previous
- variable declaration, lay it out and output its rtl. */
-
- if (current_binding_level->incomplete_list != NULL_TREE)
- {
- tree prev = NULL_TREE;
-
- for (x = current_binding_level->incomplete_list; x; x = TREE_CHAIN (x))
- {
- tree decl = TREE_VALUE (x);
-
- if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
- && TREE_CODE (decl) != TYPE_DECL)
- {
- layout_decl (decl, 0);
- /* This is a no-op in c-lang.c or something real in objc-act.c. */
- if (c_dialect_objc ())
- objc_check_decl (decl);
- rest_of_decl_compilation (decl, NULL, toplevel, 0);
- if (! toplevel)
- expand_decl (decl);
- /* Unlink X from the incomplete list. */
- if (prev)
- TREE_CHAIN (prev) = TREE_CHAIN (x);
- else
- current_binding_level->incomplete_list = TREE_CHAIN (x);
- }
- else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
- && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
- {
- tree element = TREE_TYPE (decl);
- while (TREE_CODE (element) == ARRAY_TYPE)
- element = TREE_TYPE (element);
- if (element == t)
- {
- layout_array_type (TREE_TYPE (decl));
- if (TREE_CODE (decl) != TYPE_DECL)
- {
- layout_decl (decl, 0);
- if (c_dialect_objc ())
- objc_check_decl (decl);
- rest_of_decl_compilation (decl, NULL, toplevel, 0);
- if (! toplevel)
- expand_decl (decl);
- }
- /* Unlink X from the incomplete list. */
- if (prev)
- TREE_CHAIN (prev) = TREE_CHAIN (x);
- else
- current_binding_level->incomplete_list = TREE_CHAIN (x);
- }
- }
+ }
+
+ /* If this structure or union completes the type of any previous
+ variable declaration, lay it out and output its rtl. */
+ for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
+ x;
+ x = TREE_CHAIN (x))
+ {
+ tree decl = TREE_VALUE (x);
+ if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
+ layout_array_type (TREE_TYPE (decl));
+ if (TREE_CODE (decl) != TYPE_DECL)
+ {
+ layout_decl (decl, 0);
+ if (c_dialect_objc ())
+ objc_check_decl (decl);
+ rest_of_decl_compilation (decl, toplevel, 0);
+ if (!toplevel)
+ expand_decl (decl);
}
}
+ C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
/* Finish debugging output for this type. */
rest_of_type_compilation (t, toplevel);
pushtag (name, enumtype);
}
+ if (C_TYPE_BEING_DEFINED (enumtype))
+ error ("nested redefinition of %<enum %s%>", IDENTIFIER_POINTER (name));
+
C_TYPE_BEING_DEFINED (enumtype) = 1;
if (TYPE_VALUES (enumtype) != 0)
{
/* This enum is a named one that has been declared already. */
- error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
+ error ("redeclaration of %<enum %s%>", IDENTIFIER_POINTER (name));
/* Completely replace its old definition.
The old enumerators remain defined, however. */
finish_enum (tree enumtype, tree values, tree attributes)
{
tree pair, tem;
- tree minnode = 0, maxnode = 0, enum_value_type;
+ tree minnode = 0, maxnode = 0;
int precision, unsign;
- int toplevel = (global_binding_level == current_binding_level);
-
- if (in_parm_level_p ())
- warning ("enum defined inside parms");
+ bool toplevel = (file_scope == current_scope);
+ struct lang_type *lt;
decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
unsign = (tree_int_cst_sgn (minnode) >= 0);
precision = MAX (min_precision (minnode, unsign),
min_precision (maxnode, unsign));
+
if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
{
- tree narrowest = c_common_type_for_size (precision, unsign);
- if (narrowest == 0)
+ tem = c_common_type_for_size (precision, unsign);
+ if (tem == NULL)
{
warning ("enumeration values exceed range of largest integer");
- narrowest = long_long_integer_type_node;
+ tem = long_long_integer_type_node;
}
-
- precision = TYPE_PRECISION (narrowest);
}
else
- precision = TYPE_PRECISION (integer_type_node);
+ tem = unsign ? unsigned_type_node : integer_type_node;
+
+ TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
+ TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
+ TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
+ TYPE_SIZE (enumtype) = 0;
- if (precision == TYPE_PRECISION (integer_type_node))
- enum_value_type = c_common_type_for_size (precision, 0);
+ /* If the precision of the type was specific with an attribute and it
+ was too small, give an error. Otherwise, use it. */
+ if (TYPE_PRECISION (enumtype))
+ {
+ if (precision > TYPE_PRECISION (enumtype))
+ error ("specified mode too small for enumeral values");
+ }
else
- enum_value_type = enumtype;
+ TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
- TYPE_MIN_VALUE (enumtype) = minnode;
- TYPE_MAX_VALUE (enumtype) = maxnode;
- TYPE_PRECISION (enumtype) = precision;
- TREE_UNSIGNED (enumtype) = unsign;
- TYPE_SIZE (enumtype) = 0;
layout_type (enumtype);
if (values != error_mark_node)
for (pair = values; pair; pair = TREE_CHAIN (pair))
{
tree enu = TREE_PURPOSE (pair);
+ tree ini = DECL_INITIAL (enu);
TREE_TYPE (enu) = enumtype;
when comparing integers with enumerators that fit in the
int range. When -pedantic is given, build_enumerator()
would have already taken care of those that don't fit. */
- if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
- DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
+ if (int_fits_type_p (ini, integer_type_node))
+ tem = integer_type_node;
else
- DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
+ tem = enumtype;
+ ini = convert (tem, ini);
+ DECL_INITIAL (enu) = ini;
TREE_PURPOSE (pair) = DECL_NAME (enu);
- TREE_VALUE (pair) = DECL_INITIAL (enu);
+ TREE_VALUE (pair) = ini;
}
TYPE_VALUES (enumtype) = values;
}
+ /* Record the min/max values so that we can warn about bit-field
+ enumerations that are too small for the values. */
+ lt = GGC_CNEW (struct lang_type);
+ lt->enum_min = minnode;
+ lt->enum_max = maxnode;
+ TYPE_LANG_SPECIFIC (enumtype) = lt;
+
/* Fix up all variant types of this enum type. */
for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
{
TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
- TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
+ TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
+ TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
}
/* Finish debugging output for this type. */
if (value != 0)
{
- if (TREE_CODE (value) == INTEGER_CST)
+ /* Don't issue more errors for error_mark_node (i.e. an
+ undeclared identifier) - just ignore the value expression. */
+ if (value == error_mark_node)
+ value = 0;
+ else if (TREE_CODE (value) != INTEGER_CST)
{
- value = default_conversion (value);
- constant_expression_warning (value);
+ error ("enumerator value for %qE is not an integer constant", name);
+ value = 0;
}
else
{
- error ("enumerator value for `%s' not integer constant",
- IDENTIFIER_POINTER (name));
- value = 0;
+ value = default_conversion (value);
+ constant_expression_warning (value);
}
}
error ("overflow in enumeration values");
}
- if (pedantic && ! int_fits_type_p (value, integer_type_node))
+ if (pedantic && !int_fits_type_p (value, integer_type_node))
{
- pedwarn ("ISO C restricts enumerator values to range of `int'");
+ pedwarn ("ISO C restricts enumerator values to range of %<int%>");
+ /* XXX This causes -pedantic to change the meaning of the program.
+ Remove? -zw 2004-03-15 */
value = convert (integer_type_node, value);
}
TYPE_PRECISION (integer_type_node)),
(TYPE_PRECISION (type)
>= TYPE_PRECISION (integer_type_node)
- && TREE_UNSIGNED (type)));
+ && TYPE_UNSIGNED (type)));
decl = build_decl (CONST_DECL, name, type);
DECL_INITIAL (decl) = convert (type, value);
yyparse to report a parse error. */
int
-start_function (tree declspecs, tree declarator, tree attributes)
+start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
+ tree attributes)
{
tree decl1, old_decl;
- tree restype;
- int old_immediate_size_expand = immediate_size_expand;
+ tree restype, resdecl;
current_function_returns_value = 0; /* Assume, until we see it does. */
current_function_returns_null = 0;
current_function_returns_abnormally = 0;
warn_about_return_type = 0;
current_extern_inline = 0;
- named_labels = 0;
- shadowed_labels = 0;
+ c_switch_stack = NULL;
- /* Don't expand any sizes in the return type of the function. */
- immediate_size_expand = 0;
+ /* Indicate no valid break/continue context by setting these variables
+ to some non-null, non-label value. We'll notice and emit the proper
+ error message in c_finish_bc_stmt. */
+ c_break_label = c_cont_label = size_zero_node;
- decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
+ decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL);
/* If the declarator is not suitable for a function definition,
cause a syntax error. */
if (decl1 == 0)
- {
- immediate_size_expand = old_immediate_size_expand;
- return 0;
- }
+ return 0;
decl_attributes (&decl1, attributes, 0);
- /* If #pragma weak was used, mark the decl weak now. */
- if (current_binding_level == global_binding_level)
- maybe_apply_pragma_weak (decl1);
-
if (DECL_DECLARED_INLINE_P (decl1)
&& DECL_UNINLINABLE (decl1)
&& lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
- warning_with_decl (decl1,
- "inline function `%s' given attribute noinline");
+ warning ("%Jinline function %qD given attribute noinline", decl1, decl1);
announce_function (decl1);
}
if (warn_about_return_type)
- pedwarn_c99 ("return type defaults to `int'");
-
- /* Save the parm names or decls from this function's declarator
- where store_parm_decls will find them. */
- current_function_parms = last_function_parms;
- current_function_parm_tags = last_function_parm_tags;
+ pedwarn_c99 ("return type defaults to %<int%>");
/* Make the init_value nonzero so pushdecl knows this is not tentative.
- error_mark_node is replaced below (in poplevel) with the BLOCK. */
+ error_mark_node is replaced below (in pop_scope) with the BLOCK. */
DECL_INITIAL (decl1) = error_mark_node;
/* If this definition isn't a prototype and we had a prototype declaration
before, copy the arg type info from that prototype.
But not if what we had before was a builtin function. */
- old_decl = lookup_name_current_level (DECL_NAME (decl1));
+ old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
&& !DECL_BUILT_IN (old_decl)
- && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
- == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
+ && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
+ TREE_TYPE (TREE_TYPE (old_decl)))
&& TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
{
- TREE_TYPE (decl1) = TREE_TYPE (old_decl);
+ TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
+ TREE_TYPE (decl1));
current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
}
if (warn_strict_prototypes
&& TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
&& C_DECL_ISNT_PROTOTYPE (old_decl))
- warning ("function declaration isn't a prototype");
+ warning ("function declaration isn%'t a prototype");
/* Optionally warn of any global def with no previous prototype. */
else if (warn_missing_prototypes
&& TREE_PUBLIC (decl1)
- && ! MAIN_NAME_P (DECL_NAME (decl1))
+ && !MAIN_NAME_P (DECL_NAME (decl1))
&& C_DECL_ISNT_PROTOTYPE (old_decl))
- warning_with_decl (decl1, "no previous prototype for `%s'");
+ warning ("%Jno previous prototype for %qD", decl1, decl1);
/* Optionally warn of any def with no previous prototype
if the function has already been used. */
else if (warn_missing_prototypes
&& old_decl != 0 && TREE_USED (old_decl)
&& TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
- warning_with_decl (decl1,
- "`%s' was used with no prototype before its definition");
+ warning ("%J%qD was used with no prototype before its definition",
+ decl1, decl1);
/* Optionally warn of any global def with no previous declaration. */
else if (warn_missing_declarations
&& TREE_PUBLIC (decl1)
&& old_decl == 0
- && ! MAIN_NAME_P (DECL_NAME (decl1)))
- warning_with_decl (decl1, "no previous declaration for `%s'");
+ && !MAIN_NAME_P (DECL_NAME (decl1)))
+ warning ("%Jno previous declaration for %qD", decl1, decl1);
/* Optionally warn of any def with no previous declaration
if the function has already been used. */
else if (warn_missing_declarations
&& old_decl != 0 && TREE_USED (old_decl)
&& C_DECL_IMPLICIT (old_decl))
- warning_with_decl (decl1,
- "`%s' was used with no declaration before its definition");
+ warning ("%J%qD was used with no declaration before its definition",
+ decl1, decl1);
/* This is a definition, not a reference.
So normally clear DECL_EXTERNAL.
if (current_function_decl != 0)
TREE_PUBLIC (decl1) = 0;
+ /* This is the earliest point at which we might know the assembler
+ name of the function. Thus, if it's set before this, die horribly. */
+ gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
+
+ /* If #pragma weak was used, mark the decl weak now. */
+ if (current_scope == file_scope)
+ maybe_apply_pragma_weak (decl1);
+
/* Warn for unlikely, improbable, or stupid declarations of `main'. */
if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
{
if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
!= integer_type_node)
- pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
+ pedwarn ("%Jreturn type of %qD is not %<int%>", decl1, decl1);
for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
args = TREE_CHAIN (args))
{
case 1:
if (TYPE_MAIN_VARIANT (type) != integer_type_node)
- pedwarn_with_decl (decl1,
- "first argument of `%s' should be `int'");
+ pedwarn ("%Jfirst argument of %qD should be %<int%>",
+ decl1, decl1);
break;
case 2:
|| TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
|| (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
!= char_type_node))
- pedwarn_with_decl (decl1,
- "second argument of `%s' should be `char **'");
+ pedwarn ("%Jsecond argument of %qD should be %<char **%>",
+ decl1, decl1);
break;
case 3:
|| TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
|| (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
!= char_type_node))
- pedwarn_with_decl (decl1,
- "third argument of `%s' should probably be `char **'");
+ pedwarn ("%Jthird argument of %qD should probably be "
+ "%<char **%>", decl1, decl1);
break;
}
}
argument because it's only mentioned in an appendix of the
standard. */
if (argct > 0 && (argct < 2 || argct > 3))
- pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
+ pedwarn ("%J%qD takes only zero or two arguments", decl1, decl1);
- if (! TREE_PUBLIC (decl1))
- pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
+ if (!TREE_PUBLIC (decl1))
+ pedwarn ("%J%qD is normally a non-static function", decl1, decl1);
}
/* Record the decl so that the function name is defined.
current_function_decl = pushdecl (decl1);
- pushlevel (0);
+ push_scope ();
declare_parm_level ();
- make_decl_rtl (current_function_decl, NULL);
-
restype = TREE_TYPE (TREE_TYPE (current_function_decl));
/* Promote the value to int before returning it. */
if (c_promoting_integer_type_p (restype))
{
/* It retains unsignedness if not really getting wider. */
- if (TREE_UNSIGNED (restype)
+ if (TYPE_UNSIGNED (restype)
&& (TYPE_PRECISION (restype)
== TYPE_PRECISION (integer_type_node)))
restype = unsigned_type_node;
else
restype = integer_type_node;
}
- DECL_RESULT (current_function_decl)
- = build_decl (RESULT_DECL, NULL_TREE, restype);
-
- /* If this fcn was already referenced via a block-scope `extern' decl
- (or an implicit decl), propagate certain information about the usage. */
- if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
- TREE_ADDRESSABLE (current_function_decl) = 1;
- immediate_size_expand = old_immediate_size_expand;
+ resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
+ DECL_ARTIFICIAL (resdecl) = 1;
+ DECL_IGNORED_P (resdecl) = 1;
+ DECL_RESULT (current_function_decl) = resdecl;
start_fname_decls ();
return 1;
}
\f
-/* Store the parameter declarations into the current function declaration.
- This is called after parsing the parameter declarations, before
- digesting the body of the function.
-
- For an old-style definition, modify the function's type
- to specify at least the number of arguments. */
-
-void
-store_parm_decls (void)
+/* Subroutine of store_parm_decls which handles new-style function
+ definitions (prototype format). The parms already have decls, so we
+ need only record them as in effect and complain if any redundant
+ old-style parm decls were written. */
+static void
+store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
{
- tree fndecl = current_function_decl;
- tree parm;
-
- /* This is either a chain of PARM_DECLs (if a prototype was used)
- or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
- tree specparms = current_function_parms;
-
- /* This is a list of types declared among parms in a prototype. */
- tree parmtags = current_function_parm_tags;
+ tree decl;
- /* This is a chain of PARM_DECLs from old-style parm declarations. */
- tree parmdecls = getdecls ();
+ if (current_scope->bindings)
+ {
+ error ("%Jold-style parameter declarations in prototyped "
+ "function definition", fndecl);
- /* This is a chain of any other decls that came in among the parm
- declarations. If a parm is declared with enum {foo, bar} x;
- then CONST_DECLs for foo and bar are put here. */
- tree nonparms = 0;
+ /* Get rid of the old-style declarations. */
+ pop_scope ();
+ push_scope ();
+ }
+ /* Don't issue this warning for nested functions, and don't issue this
+ warning if we got here because ARG_INFO_TYPES was error_mark_node
+ (this happens when a function definition has just an ellipsis in
+ its parameter list). */
+ else if (warn_traditional && !in_system_header && !current_function_scope
+ && arg_info->types != error_mark_node)
+ warning ("%Jtraditional C rejects ISO C style function definitions",
+ fndecl);
+
+ /* Now make all the parameter declarations visible in the function body.
+ We can bypass most of the grunt work of pushdecl. */
+ for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
+ {
+ DECL_CONTEXT (decl) = current_function_decl;
+ if (DECL_NAME (decl))
+ bind (DECL_NAME (decl), decl, current_scope,
+ /*invisible=*/false, /*nested=*/false);
+ else
+ error ("%Jparameter name omitted", decl);
+ }
- /* The function containing FNDECL, if any. */
- tree context = decl_function_context (fndecl);
+ /* Record the parameter list in the function declaration. */
+ DECL_ARGUMENTS (fndecl) = arg_info->parms;
- /* Nonzero if this definition is written with a prototype. */
- int prototype = 0;
+ /* Now make all the ancillary declarations visible, likewise. */
+ for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
+ {
+ DECL_CONTEXT (decl) = current_function_decl;
+ if (DECL_NAME (decl))
+ bind (DECL_NAME (decl), decl, current_scope,
+ /*invisible=*/false, /*nested=*/false);
+ }
- bool saved_warn_shadow = warn_shadow;
+ /* And all the tag declarations. */
+ for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
+ if (TREE_PURPOSE (decl))
+ bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
+ /*invisible=*/false, /*nested=*/false);
+}
- /* Don't re-emit shadow warnings. */
- warn_shadow = false;
+/* Subroutine of store_parm_decls which handles old-style function
+ definitions (separate parameter list and declarations). */
- if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
- {
- /* This case is when the function was defined with an ANSI prototype.
- The parms already have decls, so we need not do anything here
- except record them as in effect
- and complain if any redundant old-style parm decls were written. */
+static void
+store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
+{
+ struct c_binding *b;
+ tree parm, decl, last;
+ tree parmids = arg_info->parms;
- tree next;
- tree others = 0;
+ /* We use DECL_WEAK as a flag to show which parameters have been
+ seen already, since it is not used on PARM_DECL. */
+#ifdef ENABLE_CHECKING
+ for (b = current_scope->bindings; b; b = b->prev)
+ gcc_assert (TREE_CODE (b->decl) != PARM_DECL || !DECL_WEAK (b->decl));
+#endif
- prototype = 1;
+ if (warn_old_style_definition && !in_system_header)
+ warning ("%Jold-style function definition", fndecl);
- if (parmdecls != 0)
+ /* Match each formal parameter name with its declaration. Save each
+ decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
+ for (parm = parmids; parm; parm = TREE_CHAIN (parm))
+ {
+ if (TREE_VALUE (parm) == 0)
{
- tree decl, link;
-
- error_with_decl (fndecl,
- "parm types given both in parmlist and separately");
- /* Get rid of the erroneous decls; don't keep them on
- the list of parms, since they might not be PARM_DECLs. */
- for (decl = current_binding_level->names;
- decl; decl = TREE_CHAIN (decl))
- if (DECL_NAME (decl))
- IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = 0;
- for (link = current_binding_level->shadowed;
- link; link = TREE_CHAIN (link))
- IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
- current_binding_level->names = 0;
- current_binding_level->shadowed = 0;
+ error ("%Jparameter name missing from parameter list", fndecl);
+ TREE_PURPOSE (parm) = 0;
+ continue;
}
- specparms = nreverse (specparms);
- for (parm = specparms; parm; parm = next)
+ b = I_SYMBOL_BINDING (TREE_VALUE (parm));
+ if (b && B_IN_CURRENT_SCOPE (b))
{
- next = TREE_CHAIN (parm);
- if (TREE_CODE (parm) == PARM_DECL)
+ decl = b->decl;
+ /* If we got something other than a PARM_DECL it is an error. */
+ if (TREE_CODE (decl) != PARM_DECL)
+ error ("%J%qD declared as a non-parameter", decl, decl);
+ /* If the declaration is already marked, we have a duplicate
+ name. Complain and ignore the duplicate. */
+ else if (DECL_WEAK (decl))
{
- if (DECL_NAME (parm) == 0)
- error_with_decl (parm, "parameter name omitted");
- else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
- && VOID_TYPE_P (TREE_TYPE (parm)))
- {
- error_with_decl (parm, "parameter `%s' declared void");
- /* Change the type to error_mark_node so this parameter
- will be ignored by assign_parms. */
- TREE_TYPE (parm) = error_mark_node;
- }
- pushdecl (parm);
+ error ("%Jmultiple parameters named %qD", decl, decl);
+ TREE_PURPOSE (parm) = 0;
+ continue;
}
- else
+ /* If the declaration says "void", complain and turn it into
+ an int. */
+ else if (VOID_TYPE_P (TREE_TYPE (decl)))
{
- /* If we find an enum constant or a type tag,
- put it aside for the moment. */
- TREE_CHAIN (parm) = 0;
- others = chainon (others, parm);
+ error ("%Jparameter %qD declared with void type", decl, decl);
+ TREE_TYPE (decl) = integer_type_node;
+ DECL_ARG_TYPE (decl) = integer_type_node;
+ layout_decl (decl, 0);
}
}
-
- /* Get the decls in their original chain order
- and record in the function. */
- DECL_ARGUMENTS (fndecl) = getdecls ();
-
- /* Now pushdecl the enum constants. */
- for (parm = others; parm; parm = next)
+ /* If no declaration found, default to int. */
+ else
{
- next = TREE_CHAIN (parm);
- if (DECL_NAME (parm) == 0)
- ;
- else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
- ;
- else if (TREE_CODE (parm) != PARM_DECL)
- pushdecl (parm);
+ decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
+ DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
+ DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
+ pushdecl (decl);
+
+ if (flag_isoc99)
+ pedwarn ("%Jtype of %qD defaults to %<int%>", decl, decl);
+ else if (extra_warnings)
+ warning ("%Jtype of %qD defaults to %<int%>", decl, decl);
}
- storetags (chainon (parmtags, gettags ()));
+ TREE_PURPOSE (parm) = decl;
+ DECL_WEAK (decl) = 1;
}
- else
- {
- /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
- each with a parm name as the TREE_VALUE.
- PARMDECLS is a chain of declarations for parameters.
- Warning! It can also contain CONST_DECLs which are not parameters
- but are names of enumerators of any enum types
- declared among the parameters.
+ /* Now examine the parms chain for incomplete declarations
+ and declarations with no corresponding names. */
- First match each formal parameter name with its declaration.
- Associate decls with the names and store the decls
- into the TREE_PURPOSE slots. */
-
- /* We use DECL_WEAK as a flag to show which parameters have been
- seen already since it is not used on PARM_DECL or CONST_DECL. */
- for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
- DECL_WEAK (parm) = 0;
+ for (b = current_scope->bindings; b; b = b->prev)
+ {
+ parm = b->decl;
+ if (TREE_CODE (parm) != PARM_DECL)
+ continue;
- for (parm = specparms; parm; parm = TREE_CHAIN (parm))
+ if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
{
- tree tail, found = NULL;
-
- if (TREE_VALUE (parm) == 0)
- {
- error_with_decl (fndecl,
- "parameter name missing from parameter list");
- TREE_PURPOSE (parm) = 0;
- continue;
- }
-
- /* See if any of the parmdecls specifies this parm by name.
- Ignore any enumerator decls. */
- for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
- if (DECL_NAME (tail) == TREE_VALUE (parm)
- && TREE_CODE (tail) == PARM_DECL)
- {
- found = tail;
- break;
- }
-
- /* If declaration already marked, we have a duplicate name.
- Complain, and don't use this decl twice. */
- if (found && DECL_WEAK (found))
- {
- error_with_decl (found, "multiple parameters named `%s'");
- found = 0;
- }
-
- /* If the declaration says "void", complain and ignore it. */
- if (found && VOID_TYPE_P (TREE_TYPE (found)))
- {
- error_with_decl (found, "parameter `%s' declared void");
- TREE_TYPE (found) = integer_type_node;
- DECL_ARG_TYPE (found) = integer_type_node;
- layout_decl (found, 0);
- }
-
- /* If no declaration found, default to int. */
- if (!found)
- {
- found = build_decl (PARM_DECL, TREE_VALUE (parm),
- integer_type_node);
- DECL_ARG_TYPE (found) = TREE_TYPE (found);
- DECL_SOURCE_LOCATION (found) = DECL_SOURCE_LOCATION (fndecl);
- if (flag_isoc99)
- pedwarn_with_decl (found, "type of `%s' defaults to `int'");
- else if (extra_warnings)
- warning_with_decl (found, "type of `%s' defaults to `int'");
- pushdecl (found);
- }
-
- TREE_PURPOSE (parm) = found;
-
- /* Mark this decl as "already found". */
- DECL_WEAK (found) = 1;
+ error ("%Jparameter %qD has incomplete type", parm, parm);
+ TREE_TYPE (parm) = error_mark_node;
}
- /* Put anything which is on the parmdecls chain and which is
- not a PARM_DECL onto the list NONPARMS. (The types of
- non-parm things which might appear on the list include
- enumerators and NULL-named TYPE_DECL nodes.) Complain about
- any actual PARM_DECLs not matched with any names. */
-
- nonparms = 0;
- for (parm = parmdecls; parm;)
+ if (!DECL_WEAK (parm))
{
- tree next = TREE_CHAIN (parm);
- TREE_CHAIN (parm) = 0;
+ error ("%Jdeclaration for parameter %qD but no such parameter",
+ parm, parm);
- if (TREE_CODE (parm) != PARM_DECL)
- nonparms = chainon (nonparms, parm);
- else
- {
- /* Complain about args with incomplete types. */
- if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
- {
- error_with_decl (parm, "parameter `%s' has incomplete type");
- TREE_TYPE (parm) = error_mark_node;
- }
+ /* Pretend the parameter was not missing.
+ This gets us to a standard state and minimizes
+ further error messages. */
+ parmids = chainon (parmids, tree_cons (parm, 0, 0));
+ }
+ }
- if (! DECL_WEAK (parm))
- {
- error_with_decl (parm,
- "declaration for parameter `%s' but no such parameter");
- /* Pretend the parameter was not missing.
- This gets us to a standard state and minimizes
- further error messages. */
- specparms
- = chainon (specparms,
- tree_cons (parm, NULL_TREE, NULL_TREE));
- }
- }
+ /* Chain the declarations together in the order of the list of
+ names. Store that chain in the function decl, replacing the
+ list of names. Update the current scope to match. */
+ DECL_ARGUMENTS (fndecl) = 0;
- parm = next;
- }
+ for (parm = parmids; parm; parm = TREE_CHAIN (parm))
+ if (TREE_PURPOSE (parm))
+ break;
+ if (parm && TREE_PURPOSE (parm))
+ {
+ last = TREE_PURPOSE (parm);
+ DECL_ARGUMENTS (fndecl) = last;
+ DECL_WEAK (last) = 0;
- /* Chain the declarations together in the order of the list of
- names. Store that chain in the function decl, replacing the
- list of names. */
- parm = specparms;
- DECL_ARGUMENTS (fndecl) = 0;
- {
- tree last;
- for (last = 0; parm; parm = TREE_CHAIN (parm))
- if (TREE_PURPOSE (parm))
- {
- if (last == 0)
- DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
- else
- TREE_CHAIN (last) = TREE_PURPOSE (parm);
- last = TREE_PURPOSE (parm);
- TREE_CHAIN (last) = 0;
- }
- }
+ for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
+ if (TREE_PURPOSE (parm))
+ {
+ TREE_CHAIN (last) = TREE_PURPOSE (parm);
+ last = TREE_PURPOSE (parm);
+ DECL_WEAK (last) = 0;
+ }
+ TREE_CHAIN (last) = 0;
+ }
- /* If there was a previous prototype,
- set the DECL_ARG_TYPE of each argument according to
- the type previously specified, and report any mismatches. */
+ /* If there was a previous prototype,
+ set the DECL_ARG_TYPE of each argument according to
+ the type previously specified, and report any mismatches. */
- if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
+ if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
+ {
+ tree type;
+ for (parm = DECL_ARGUMENTS (fndecl),
+ type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
+ parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
+ != void_type_node));
+ parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
{
- tree type;
- for (parm = DECL_ARGUMENTS (fndecl),
- type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
- parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
- != void_type_node));
- parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
+ if (parm == 0 || type == 0
+ || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
{
- if (parm == 0 || type == 0
- || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
- {
- error ("number of arguments doesn't match prototype");
- error ("%Hprototype declaration",
- ¤t_function_prototype_locus);
- break;
- }
- /* Type for passing arg must be consistent with that
- declared for the arg. ISO C says we take the unqualified
- type for parameters declared with qualified type. */
- if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
- TYPE_MAIN_VARIANT (TREE_VALUE (type)),
- COMPARE_STRICT))
+ error ("number of arguments doesn%'t match prototype");
+ error ("%Hprototype declaration",
+ ¤t_function_prototype_locus);
+ break;
+ }
+ /* Type for passing arg must be consistent with that
+ declared for the arg. ISO C says we take the unqualified
+ type for parameters declared with qualified type. */
+ if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
+ TYPE_MAIN_VARIANT (TREE_VALUE (type))))
+ {
+ if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
+ == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
{
- if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
- == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
- {
- /* Adjust argument to match prototype. E.g. a previous
- `int foo(float);' prototype causes
- `int foo(x) float x; {...}' to be treated like
- `int foo(float x) {...}'. This is particularly
- useful for argument types like uid_t. */
- DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
-
- if (PROMOTE_PROTOTYPES
- && INTEGRAL_TYPE_P (TREE_TYPE (parm))
- && TYPE_PRECISION (TREE_TYPE (parm))
- < TYPE_PRECISION (integer_type_node))
- DECL_ARG_TYPE (parm) = integer_type_node;
-
- if (pedantic)
- {
- pedwarn ("promoted argument `%s' doesn't match prototype",
- IDENTIFIER_POINTER (DECL_NAME (parm)));
- warning ("%Hprototype declaration",
- ¤t_function_prototype_locus);
- }
- }
- else
+ /* Adjust argument to match prototype. E.g. a previous
+ `int foo(float);' prototype causes
+ `int foo(x) float x; {...}' to be treated like
+ `int foo(float x) {...}'. This is particularly
+ useful for argument types like uid_t. */
+ DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
+
+ if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
+ && INTEGRAL_TYPE_P (TREE_TYPE (parm))
+ && TYPE_PRECISION (TREE_TYPE (parm))
+ < TYPE_PRECISION (integer_type_node))
+ DECL_ARG_TYPE (parm) = integer_type_node;
+
+ if (pedantic)
{
- error ("argument `%s' doesn't match prototype",
- IDENTIFIER_POINTER (DECL_NAME (parm)));
- error ("%Hprototype declaration",
- ¤t_function_prototype_locus);
+ pedwarn ("promoted argument %qD "
+ "doesn%'t match prototype", parm);
+ pedwarn ("%Hprototype declaration",
+ ¤t_function_prototype_locus);
}
}
+ else
+ {
+ error ("argument %qD doesn%'t match prototype", parm);
+ error ("%Hprototype declaration",
+ ¤t_function_prototype_locus);
+ }
}
- TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
}
+ TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
+ }
- /* Otherwise, create a prototype that would match. */
+ /* Otherwise, create a prototype that would match. */
- else
- {
- tree actual = 0, last = 0, type;
+ else
+ {
+ tree actual = 0, last = 0, type;
- for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
- {
- type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
- if (last)
- TREE_CHAIN (last) = type;
- else
- actual = type;
- last = type;
- }
- type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
+ for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
+ {
+ type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
if (last)
TREE_CHAIN (last) = type;
else
actual = type;
+ last = type;
+ }
+ type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
+ if (last)
+ TREE_CHAIN (last) = type;
+ else
+ actual = type;
- /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
- of the type of this function, but we need to avoid having this
- affect the types of other similarly-typed functions, so we must
- first force the generation of an identical (but separate) type
- node for the relevant function type. The new node we create
- will be a variant of the main variant of the original function
- type. */
+ /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
+ of the type of this function, but we need to avoid having this
+ affect the types of other similarly-typed functions, so we must
+ first force the generation of an identical (but separate) type
+ node for the relevant function type. The new node we create
+ will be a variant of the main variant of the original function
+ type. */
- TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
+ TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
- TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
- }
+ TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
+ }
+}
- /* Now store the final chain of decls for the arguments
- as the decl-chain of the current lexical scope.
- Put the enumerators in as well, at the front so that
- DECL_ARGUMENTS is not modified. */
+/* Store parameter declarations passed in ARG_INFO into the current
+ function declaration. */
- storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
- }
+void
+store_parm_decls_from (struct c_arg_info *arg_info)
+{
+ current_function_arg_info = arg_info;
+ store_parm_decls ();
+}
+
+/* Store the parameter declarations into the current function declaration.
+ This is called after parsing the parameter declarations, before
+ digesting the body of the function.
+
+ For an old-style definition, construct a prototype out of the old-style
+ parameter declarations and inject it into the function's type. */
+
+void
+store_parm_decls (void)
+{
+ tree fndecl = current_function_decl;
+ bool proto;
+
+ /* The argument information block for FNDECL. */
+ struct c_arg_info *arg_info = current_function_arg_info;
+ current_function_arg_info = 0;
+
+ /* True if this definition is written with a prototype. Note:
+ despite C99 6.7.5.3p14, we can *not* treat an empty argument
+ list in a function definition as equivalent to (void) -- an
+ empty argument list specifies the function has no parameters,
+ but only (void) sets up a prototype for future calls. */
+ proto = arg_info->types != 0;
- /* Make sure the binding level for the top of the function body
- gets a BLOCK if there are any in the function.
- Otherwise, the dbx output is wrong. */
+ if (proto)
+ store_parm_decls_newstyle (fndecl, arg_info);
+ else
+ store_parm_decls_oldstyle (fndecl, arg_info);
+
+ /* The next call to push_scope will be a function body. */
- keep_next_if_subblocks = 1;
+ next_is_function_body = true;
/* Write a record describing this function definition to the prototypes
file (if requested). */
- gen_aux_info_record (fndecl, 1, 0, prototype);
+ gen_aux_info_record (fndecl, 1, 0, proto);
/* Initialize the RTL code for the function. */
- init_function_start (fndecl);
+ allocate_struct_function (fndecl);
/* Begin the statement tree for this function. */
- begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
-
- /* If this is a nested function, save away the sizes of any
- variable-size types so that we can expand them when generating
- RTL. */
- if (context)
- {
- tree t;
+ DECL_SAVED_TREE (fndecl) = push_stmt_list ();
- DECL_LANG_SPECIFIC (fndecl)->pending_sizes
- = nreverse (get_pending_sizes ());
- for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
- t;
- t = TREE_CHAIN (t))
- SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
- }
-
- /* This function is being processed in whole-function mode. */
- cfun->x_whole_function_mode_p = 1;
+ /* ??? Insert the contents of the pending sizes list into the function
+ to be evaluated. This just changes mis-behavior until assign_parms
+ phase ordering problems are resolved. */
+ {
+ tree t;
+ for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
+ add_stmt (TREE_VALUE (t));
+ }
/* Even though we're inside a function body, we still don't want to
call expand_expr to calculate the size of a variable-sized array.
We haven't necessarily assigned RTL to all variables yet, so it's
not safe to try to expand expressions involving them. */
- immediate_size_expand = 0;
cfun->x_dont_save_pending_sizes_p = 1;
-
- warn_shadow = saved_warn_shadow;
}
\f
+/* Handle attribute((warn_unused_result)) on FNDECL and all its nested
+ functions. */
+
+static void
+c_warn_unused_result_recursively (tree fndecl)
+{
+ struct cgraph_node *cgn;
+
+ /* Handle attribute((warn_unused_result)). Relies on gimple input. */
+ c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
+
+ /* Finalize all nested functions now. */
+ cgn = cgraph_node (fndecl);
+ for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
+ c_warn_unused_result_recursively (cgn->decl);
+}
+
/* Finish up a function declaration and compile that function
all the way to assembler language output. The free the storage
for the function definition.
- This is called after parsing the body of the function definition.
-
- NESTED is nonzero if the function being finished is nested in another.
- CAN_DEFER_P is nonzero if the function may be deferred. */
+ This is called after parsing the body of the function definition. */
void
-finish_function (int nested, int can_defer_p)
+finish_function (void)
{
tree fndecl = current_function_decl;
- /* When a function declaration is totally empty, e.g.
- void foo(void) { }
- (the argument list is irrelevant) the compstmt rule will not
- bother calling pushlevel/poplevel, which means we get here with
- the binding_level stack out of sync. Detect this situation by
- noticing that the current_binding_level is still as
- store_parm_decls left it, and do a dummy push/pop to get back to
- consistency. Note that the call to pushlevel does not actually
- push another binding level - see there for details. */
- if (current_binding_level->parm_flag && keep_next_if_subblocks)
- {
- pushlevel (0);
- poplevel (1, 0, 1);
+ if (TREE_CODE (fndecl) == FUNCTION_DECL
+ && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
+ {
+ tree args = DECL_ARGUMENTS (fndecl);
+ for (; args; args = TREE_CHAIN (args))
+ {
+ tree type = TREE_TYPE (args);
+ if (INTEGRAL_TYPE_P (type)
+ && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
+ DECL_ARG_TYPE (args) = integer_type_node;
+ }
}
- BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
+ if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
+ BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
/* Must mark the RESULT_DECL as being in this function. */
- DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
+ if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
+ DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
{
if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
!= integer_type_node)
{
- /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
- If warn_main is -1 (-Wno-main) we don't want to be warned. */
- if (! warn_main)
- pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
- }
- else
- {
-#ifdef DEFAULT_MAIN_RETURN
- /* Make it so that `main' always returns success by default. */
- DEFAULT_MAIN_RETURN;
-#else
- if (flag_isoc99)
- c_expand_return (integer_zero_node);
-#endif
- }
- }
-
- finish_fname_decls ();
-
- /* Tie off the statement tree for this function. */
- finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
-
- /* Complain if there's just no return statement. */
- if (warn_return_type
- && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
- && !current_function_returns_value && !current_function_returns_null
- /* Don't complain if we abort. */
- && !current_function_returns_abnormally
- /* Don't warn for main(). */
- && !MAIN_NAME_P (DECL_NAME (fndecl))
- /* Or if they didn't actually specify a return type. */
- && !C_FUNCTION_IMPLICIT_INT (fndecl)
- /* Normally, with -Wreturn-type, flow will complain. Unless we're an
- inline function, as we might never be compiled separately. */
- && DECL_INLINE (fndecl))
- warning ("no return statement in function returning non-void");
-
- /* Clear out memory we no longer need. */
- free_after_parsing (cfun);
- /* Since we never call rest_of_compilation, we never clear
- CFUN. Do so explicitly. */
- free_after_compilation (cfun);
- cfun = NULL;
-
- if (flag_unit_at_a_time && can_defer_p)
- {
- cgraph_finalize_function (fndecl, DECL_SAVED_TREE (fndecl));
- current_function_decl = NULL;
- return;
- }
-
- if (! nested)
- {
- /* Function is parsed.
- Generate RTL for the body of this function or defer
- it for later expansion. */
- int uninlinable = 1;
-
- /* There's no reason to do any of the work here if we're only doing
- semantic analysis; this code just generates RTL. */
- if (flag_syntax_only)
- {
- current_function_decl = NULL;
- DECL_SAVED_TREE (fndecl) = NULL_TREE;
- return;
- }
-
- if (flag_inline_trees)
- {
- /* First, cache whether the current function is inlinable. Some
- predicates depend on cfun and current_function_decl to
- function completely. */
- timevar_push (TV_INTEGRATION);
- uninlinable = ! tree_inlinable_function_p (fndecl, 0);
-
- if (can_defer_p
- /* We defer functions marked inline *even if* the function
- itself is not inlinable. This is because we don't yet
- know if the function will actually be used; we may be
- able to avoid emitting it entirely. */
- && (! uninlinable || DECL_DECLARED_INLINE_P (fndecl))
- /* Save function tree for inlining. Should return 0 if the
- language does not support function deferring or the
- function could not be deferred. */
- && defer_fn (fndecl))
- {
- /* Let the back-end know that this function exists. */
- (*debug_hooks->deferred_inline_function) (fndecl);
- timevar_pop (TV_INTEGRATION);
- current_function_decl = NULL;
- return;
- }
-
- /* Then, inline any functions called in it. */
- optimize_inline_calls (fndecl);
- timevar_pop (TV_INTEGRATION);
- }
-
- c_expand_body (fndecl);
-
- /* Keep the function body if it's needed for inlining or dumping. */
- if (uninlinable && !dump_enabled_p (TDI_all))
- {
- /* Allow the body of the function to be garbage collected. */
- DECL_SAVED_TREE (fndecl) = NULL_TREE;
- }
-
- /* Let the error reporting routines know that we're outside a
- function. For a nested function, this value is used in
- c_pop_function_context and then reset via pop_function_context. */
- current_function_decl = NULL;
- }
-}
-
-/* Generate the RTL for a deferred function FNDECL. */
-
-void
-c_expand_deferred_function (tree fndecl)
-{
- /* DECL_INLINE or DECL_RESULT might got cleared after the inline
- function was deferred, e.g. in duplicate_decls. */
- if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
- {
- if (flag_inline_trees)
- {
- timevar_push (TV_INTEGRATION);
- optimize_inline_calls (fndecl);
- timevar_pop (TV_INTEGRATION);
- }
- c_expand_body (fndecl);
- current_function_decl = NULL;
- }
-}
-
-/* Called to move the SAVE_EXPRs for parameter declarations in a
- nested function into the nested function. DATA is really the
- nested FUNCTION_DECL. */
-
-static tree
-set_save_expr_context (tree *tp,
- int *walk_subtrees,
- void *data)
-{
- if (TREE_CODE (*tp) == SAVE_EXPR && !SAVE_EXPR_CONTEXT (*tp))
- SAVE_EXPR_CONTEXT (*tp) = (tree) data;
- /* Do not walk back into the SAVE_EXPR_CONTEXT; that will cause
- circularity. */
- else if (DECL_P (*tp))
- *walk_subtrees = 0;
-
- return NULL_TREE;
-}
-
-/* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
- then we are already in the process of generating RTL for another
- function. If can_defer_p is zero, we won't attempt to defer the
- generation of RTL. */
-
-static void
-c_expand_body_1 (tree fndecl, int nested_p)
-{
- timevar_push (TV_EXPAND);
-
- if (nested_p)
- {
- /* Make sure that we will evaluate variable-sized types involved
- in our function's type. */
- expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
- /* Squirrel away our current state. */
- push_function_context ();
+ /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
+ If warn_main is -1 (-Wno-main) we don't want to be warned. */
+ if (!warn_main)
+ pedwarn ("%Jreturn type of %qD is not %<int%>", fndecl, fndecl);
+ }
+ else
+ {
+ if (flag_isoc99)
+ c_finish_return (integer_zero_node);
+ }
}
- /* Initialize the RTL code for the function. */
- current_function_decl = fndecl;
- input_location = DECL_SOURCE_LOCATION (fndecl);
- init_function_start (fndecl);
-
- /* This function is being processed in whole-function mode. */
- cfun->x_whole_function_mode_p = 1;
+ /* Tie off the statement tree for this function. */
+ DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
- /* Even though we're inside a function body, we still don't want to
- call expand_expr to calculate the size of a variable-sized array.
- We haven't necessarily assigned RTL to all variables yet, so it's
- not safe to try to expand expressions involving them. */
- immediate_size_expand = 0;
- cfun->x_dont_save_pending_sizes_p = 1;
+ finish_fname_decls ();
- /* Set up parameters and prepare for return, for the function. */
- expand_function_start (fndecl, 0);
-
- /* If the function has a variably modified type, there may be
- SAVE_EXPRs in the parameter types. Their context must be set to
- refer to this function; they cannot be expanded in the containing
- function. */
- if (decl_function_context (fndecl)
- && variably_modified_type_p (TREE_TYPE (fndecl)))
- walk_tree (&TREE_TYPE (fndecl), set_save_expr_context, fndecl,
- NULL);
-
- /* If this function is `main', emit a call to `__main'
- to run global initializers, etc. */
- if (DECL_NAME (fndecl)
- && MAIN_NAME_P (DECL_NAME (fndecl))
- && DECL_CONTEXT (fndecl) == NULL_TREE)
- expand_main_function ();
-
- /* Generate the RTL for this function. */
- expand_stmt (DECL_SAVED_TREE (fndecl));
-
- /* We hard-wired immediate_size_expand to zero above.
- expand_function_end will decrement this variable. So, we set the
- variable to one here, so that after the decrement it will remain
- zero. */
- immediate_size_expand = 1;
-
- /* Allow language dialects to perform special processing. */
- if (lang_expand_function_end)
- (*lang_expand_function_end) ();
-
- /* Generate rtl for function exit. */
- expand_function_end ();
-
- /* If this is a nested function, protect the local variables in the stack
- above us from being collected while we're compiling this function. */
- if (nested_p)
- ggc_push_context ();
-
- /* Run the optimizers and output the assembler code for this function. */
- rest_of_compilation (fndecl);
-
- /* Undo the GC context switch. */
- if (nested_p)
- ggc_pop_context ();
+ /* Complain if there's just no return statement. */
+ if (warn_return_type
+ && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
+ && !current_function_returns_value && !current_function_returns_null
+ /* Don't complain if we abort. */
+ && !current_function_returns_abnormally
+ /* Don't warn for main(). */
+ && !MAIN_NAME_P (DECL_NAME (fndecl))
+ /* Or if they didn't actually specify a return type. */
+ && !C_FUNCTION_IMPLICIT_INT (fndecl)
+ /* Normally, with -Wreturn-type, flow will complain. Unless we're an
+ inline function, as we might never be compiled separately. */
+ && DECL_INLINE (fndecl))
+ warning ("no return statement in function returning non-void");
/* With just -Wextra, complain only if function returns both with
and without a value. */
&& current_function_returns_null)
warning ("this function may return with or without a value");
- /* If requested, warn about function definitions where the function will
- return a value (usually of some struct or union type) which itself will
- take up a lot of stack space. */
+ /* Store the end of the function, so that we get good line number
+ info for the epilogue. */
+ cfun->function_end_locus = input_location;
- if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
- {
- tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
+ /* If we don't have ctors/dtors sections, and this is a static
+ constructor or destructor, it must be recorded now. */
+ if (DECL_STATIC_CONSTRUCTOR (fndecl)
+ && !targetm.have_ctors_dtors)
+ static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
+ if (DECL_STATIC_DESTRUCTOR (fndecl)
+ && !targetm.have_ctors_dtors)
+ static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
- if (ret_type && TYPE_SIZE_UNIT (ret_type)
- && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
- && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
- larger_than_size))
- {
- unsigned int size_as_int
- = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
+ /* Finalize the ELF visibility for the function. */
+ c_determine_visibility (fndecl);
- if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
- warning_with_decl (fndecl,
- "size of return value of `%s' is %u bytes",
- size_as_int);
- else
- warning_with_decl (fndecl,
- "size of return value of `%s' is larger than %d bytes",
- larger_than_size);
- }
- }
+ /* Genericize before inlining. Delay genericizing nested functions
+ until their parent function is genericized. Since finalizing
+ requires GENERIC, delay that as well. */
- if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
- && ! flag_inline_trees)
+ if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
{
- /* Stop pointing to the local nodes about to be freed.
- But DECL_INITIAL must remain nonzero so we know this
- was an actual function definition.
- For a nested function, this is done in c_pop_function_context.
- If rest_of_compilation set this to 0, leave it 0. */
- if (DECL_INITIAL (fndecl) != 0)
- DECL_INITIAL (fndecl) = error_mark_node;
-
- DECL_ARGUMENTS (fndecl) = 0;
- }
+ if (!decl_function_context (fndecl))
+ {
+ c_genericize (fndecl);
+ c_warn_unused_result_recursively (fndecl);
- if (DECL_STATIC_CONSTRUCTOR (fndecl))
- {
- if (targetm.have_ctors_dtors)
- (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
- DEFAULT_INIT_PRIORITY);
- else
- static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
- }
+ /* ??? Objc emits functions after finalizing the compilation unit.
+ This should be cleaned up later and this conditional removed. */
+ if (cgraph_global_info_ready)
+ {
+ c_expand_body (fndecl);
+ return;
+ }
- if (DECL_STATIC_DESTRUCTOR (fndecl))
- {
- if (targetm.have_ctors_dtors)
- (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
- DEFAULT_INIT_PRIORITY);
+ cgraph_finalize_function (fndecl, false);
+ }
else
- static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
+ {
+ /* Register this function with cgraph just far enough to get it
+ added to our parent's nested function list. Handy, since the
+ C front end doesn't have such a list. */
+ (void) cgraph_node (fndecl);
+ }
}
- if (nested_p)
- /* Return to the enclosing function. */
- pop_function_context ();
- timevar_pop (TV_EXPAND);
+ /* We're leaving the context of this function, so zap cfun.
+ It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
+ tree_rest_of_compilation. */
+ cfun = NULL;
+ current_function_decl = NULL;
}
-/* Like c_expand_body_1 but only for unnested functions. */
+/* Generate the RTL for the body of FNDECL. */
void
c_expand_body (tree fndecl)
{
- c_expand_body_1 (fndecl, 0);
+
+ if (!DECL_INITIAL (fndecl)
+ || DECL_INITIAL (fndecl) == error_mark_node)
+ return;
+
+ tree_rest_of_compilation (fndecl);
+
+ if (DECL_STATIC_CONSTRUCTOR (fndecl)
+ && targetm.have_ctors_dtors)
+ targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
+ DEFAULT_INIT_PRIORITY);
+ if (DECL_STATIC_DESTRUCTOR (fndecl)
+ && targetm.have_ctors_dtors)
+ targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
+ DEFAULT_INIT_PRIORITY);
}
\f
/* Check the declarations given in a for-loop for satisfying the C99
void
check_for_loop_decls (void)
{
- tree t;
+ struct c_binding *b;
if (!flag_isoc99)
{
/* If we get here, declarations have been used in a for loop without
the C99 for loop scope. This doesn't make much sense, so don't
allow it. */
- error ("`for' loop initial declaration used outside C99 mode");
+ error ("%<for%> loop initial declaration used outside C99 mode");
return;
}
/* C99 subclause 6.8.5 paragraph 3:
interpretation, to avoid creating an extension which later causes
problems. */
- for (t = gettags (); t; t = TREE_CHAIN (t))
+ for (b = current_scope->bindings; b; b = b->prev)
{
- if (TREE_PURPOSE (t) != 0)
- {
- enum tree_code code = TREE_CODE (TREE_VALUE (t));
-
- if (code == RECORD_TYPE)
- error ("`struct %s' declared in `for' loop initial declaration",
- IDENTIFIER_POINTER (TREE_PURPOSE (t)));
- else if (code == UNION_TYPE)
- error ("`union %s' declared in `for' loop initial declaration",
- IDENTIFIER_POINTER (TREE_PURPOSE (t)));
- else
- error ("`enum %s' declared in `for' loop initial declaration",
- IDENTIFIER_POINTER (TREE_PURPOSE (t)));
- }
- }
+ tree id = b->id;
+ tree decl = b->decl;
- for (t = getdecls (); t; t = TREE_CHAIN (t))
- {
- if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
- error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
- else if (TREE_STATIC (t))
- error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
- else if (DECL_EXTERNAL (t))
- error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
+ if (!id)
+ continue;
+
+ switch (TREE_CODE (decl))
+ {
+ case VAR_DECL:
+ if (TREE_STATIC (decl))
+ error ("%Jdeclaration of static variable %qD in %<for%> loop "
+ "initial declaration", decl, decl);
+ else if (DECL_EXTERNAL (decl))
+ error ("%Jdeclaration of %<extern%> variable %qD in %<for%> loop "
+ "initial declaration", decl, decl);
+ break;
+
+ case RECORD_TYPE:
+ error ("%<struct %E%> declared in %<for%> loop initial declaration",
+ id);
+ break;
+ case UNION_TYPE:
+ error ("%<union %E%> declared in %<for%> loop initial declaration",
+ id);
+ break;
+ case ENUMERAL_TYPE:
+ error ("%<enum %E%> declared in %<for%> loop initial declaration",
+ id);
+ break;
+ default:
+ error ("%Jdeclaration of non-variable %qD in %<for%> loop "
+ "initial declaration", decl, decl);
+ }
}
}
\f
-/* Save and restore the variables in this file and elsewhere
- that keep track of the progress of compilation of the current function.
- Used for nested functions. */
-
-struct language_function GTY(())
-{
- struct c_language_function base;
- tree named_labels;
- tree shadowed_labels;
- int returns_value;
- int returns_null;
- int returns_abnormally;
- int warn_about_return_type;
- int extern_inline;
- struct binding_level *binding_level;
-};
-
/* Save and reinitialize the variables
used during compilation of a C function. */
c_push_function_context (struct function *f)
{
struct language_function *p;
- p = ((struct language_function *)
- ggc_alloc (sizeof (struct language_function)));
+ p = GGC_NEW (struct language_function);
f->language = p;
p->base.x_stmt_tree = c_stmt_tree;
- p->base.x_scope_stmt_stack = c_scope_stmt_stack;
- p->named_labels = named_labels;
- p->shadowed_labels = shadowed_labels;
+ p->x_break_label = c_break_label;
+ p->x_cont_label = c_cont_label;
+ p->x_switch_stack = c_switch_stack;
+ p->arg_info = current_function_arg_info;
p->returns_value = current_function_returns_value;
p->returns_null = current_function_returns_null;
p->returns_abnormally = current_function_returns_abnormally;
p->warn_about_return_type = warn_about_return_type;
p->extern_inline = current_extern_inline;
- p->binding_level = current_binding_level;
}
/* Restore the variables used during compilation of a C function. */
c_pop_function_context (struct function *f)
{
struct language_function *p = f->language;
- tree link;
-
- /* Bring back all the labels that were shadowed. */
- for (link = shadowed_labels; link; link = TREE_CHAIN (link))
- if (DECL_NAME (TREE_VALUE (link)) != 0)
- IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
- = TREE_VALUE (link);
- if (DECL_SAVED_INSNS (current_function_decl) == 0
+ if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
&& DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
{
/* Stop pointing to the local nodes about to be freed. */
}
c_stmt_tree = p->base.x_stmt_tree;
- c_scope_stmt_stack = p->base.x_scope_stmt_stack;
- named_labels = p->named_labels;
- shadowed_labels = p->shadowed_labels;
+ c_break_label = p->x_break_label;
+ c_cont_label = p->x_cont_label;
+ c_switch_stack = p->x_switch_stack;
+ current_function_arg_info = p->arg_info;
current_function_returns_value = p->returns_value;
current_function_returns_null = p->returns_null;
current_function_returns_abnormally = p->returns_abnormally;
warn_about_return_type = p->warn_about_return_type;
current_extern_inline = p->extern_inline;
- current_binding_level = p->binding_level;
f->language = NULL;
}
if (!DECL_LANG_SPECIFIC (decl))
return;
- ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
- memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
- sizeof (struct lang_decl));
+ ld = GGC_NEW (struct lang_decl);
+ memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
DECL_LANG_SPECIFIC (decl) = ld;
}
return &c_stmt_tree;
}
-/* Returns the stack of SCOPE_STMTs for the current function. */
-
-tree *
-current_scope_stmt_stack (void)
-{
- return &c_scope_stmt_stack;
-}
-
/* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
C. */
int
-anon_aggr_type_p (tree node ATTRIBUTE_UNUSED)
+anon_aggr_type_p (tree ARG_UNUSED (node))
{
return 0;
}
-/* Dummy function in place of callback used by C++. */
-
-void
-extract_interface_info (void)
-{
-}
-
-/* Return a new COMPOUND_STMT, after adding it to the current
- statement tree. */
-
-tree
-c_begin_compound_stmt (void)
-{
- tree stmt;
-
- /* Create the COMPOUND_STMT. */
- stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
-
- return stmt;
-}
-
-/* Expand T (a DECL_STMT) if it declares an entity not handled by the
- common code. */
-
-void
-c_expand_decl_stmt (tree t)
-{
- tree decl = DECL_STMT_DECL (t);
-
- /* Expand nested functions. */
- if (TREE_CODE (decl) == FUNCTION_DECL
- && DECL_CONTEXT (decl) == current_function_decl
- && DECL_SAVED_TREE (decl))
- c_expand_body_1 (decl, 1);
-}
-
/* Return the global value of T as a symbol. */
tree
identifier_global_value (tree t)
{
- tree decl = IDENTIFIER_SYMBOL_VALUE (t);
- if (decl == 0 || C_DECL_FILE_SCOPE (decl))
- return decl;
+ struct c_binding *b;
- /* Shadowed by something else; find the true global value. */
- for (decl = global_binding_level->names; decl; decl = TREE_CHAIN (decl))
- if (DECL_NAME (decl) == t)
- return decl;
+ for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
+ if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
+ return b->decl;
- /* Only local values for this decl. */
return 0;
}
void
record_builtin_type (enum rid rid_index, const char *name, tree type)
{
- tree id;
+ tree id, decl;
if (name == 0)
id = ridpointers[(int) rid_index];
else
id = get_identifier (name);
- pushdecl (build_decl (TYPE_DECL, id, type));
+ decl = build_decl (TYPE_DECL, id, type);
+ pushdecl (decl);
+ if (debug_hooks->type_decl)
+ debug_hooks->type_decl (decl, false);
}
/* Build the void_list_node (void_type_node having been created). */
return t;
}
-/* Return something to represent absolute declarators containing a *.
- TARGET is the absolute declarator that the * contains.
- TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
- to apply to the pointer type, represented as identifiers, possible mixed
- with attributes.
+/* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
- We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
- if attributes are present) and whose type is the modifier list. */
+struct c_parm *
+build_c_parm (struct c_declspecs *specs, tree attrs,
+ struct c_declarator *declarator)
+{
+ struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
+ ret->specs = specs;
+ ret->attrs = attrs;
+ ret->declarator = declarator;
+ return ret;
+}
-tree
-make_pointer_declarator (tree type_quals_attrs, tree target)
+/* Return a declarator with nested attributes. TARGET is the inner
+ declarator to which these attributes apply. ATTRS are the
+ attributes. */
+
+struct c_declarator *
+build_attrs_declarator (tree attrs, struct c_declarator *target)
+{
+ struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
+ ret->kind = cdk_attrs;
+ ret->declarator = target;
+ ret->u.attrs = attrs;
+ return ret;
+}
+
+/* Return a declarator for a function with arguments specified by ARGS
+ and return type specified by TARGET. */
+
+struct c_declarator *
+build_function_declarator (struct c_arg_info *args,
+ struct c_declarator *target)
{
- tree quals, attrs;
- tree itarget = target;
- split_specs_attrs (type_quals_attrs, &quals, &attrs);
- if (attrs != NULL_TREE)
- itarget = tree_cons (attrs, target, NULL_TREE);
- return build1 (INDIRECT_REF, quals, itarget);
+ struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
+ ret->kind = cdk_function;
+ ret->declarator = target;
+ ret->u.arg_info = args;
+ return ret;
}
-/* Hash and equality functions for link_hash_table: key off
- DECL_ASSEMBLER_NAME. */
+/* Return a declarator for the identifier IDENT (which may be
+ NULL_TREE for an abstract declarator). */
-static hashval_t
-link_hash_hash (const void *x_p)
+struct c_declarator *
+build_id_declarator (tree ident)
{
- tree x = (tree)x_p;
- return (hashval_t) (long)DECL_ASSEMBLER_NAME (x);
+ struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
+ ret->kind = cdk_id;
+ ret->declarator = 0;
+ ret->u.id = ident;
+ return ret;
}
-static int
-link_hash_eq (const void *x1_p, const void *x2_p)
+/* Return something to represent absolute declarators containing a *.
+ TARGET is the absolute declarator that the * contains.
+ TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
+ to apply to the pointer type. */
+
+struct c_declarator *
+make_pointer_declarator (struct c_declspecs *type_quals_attrs,
+ struct c_declarator *target)
{
- tree x1 = (tree)x1_p;
- tree x2 = (tree)x2_p;
- return DECL_ASSEMBLER_NAME (x1) == DECL_ASSEMBLER_NAME (x2);
+ tree attrs;
+ int quals = 0;
+ struct c_declarator *itarget = target;
+ struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
+ if (type_quals_attrs)
+ {
+ attrs = type_quals_attrs->attrs;
+ quals = quals_from_declspecs (type_quals_attrs);
+ if (attrs != NULL_TREE)
+ itarget = build_attrs_declarator (attrs, target);
+ }
+ ret->kind = cdk_pointer;
+ ret->declarator = itarget;
+ ret->u.pointer_quals = quals;
+ return ret;
}
-/* Propagate information between definitions and uses between multiple
- translation units in TU_LIST based on linkage rules. */
+/* Return a pointer to a structure for an empty list of declaration
+ specifiers. */
-void
-merge_translation_unit_decls (void)
+struct c_declspecs *
+build_null_declspecs (void)
{
- const tree tu_list = current_file_decl;
- tree tu;
- tree decl;
- htab_t link_hash_table;
- tree block;
-
- /* Create the BLOCK that poplevel would have created, but don't
- actually call poplevel since that's expensive. */
- block = make_node (BLOCK);
- BLOCK_VARS (block) = current_binding_level->names;
- TREE_USED (block) = 1;
- DECL_INITIAL (current_file_decl) = block;
+ struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
+ ret->type = 0;
+ ret->decl_attr = 0;
+ ret->attrs = 0;
+ ret->typespec_word = cts_none;
+ ret->storage_class = csc_none;
+ ret->non_sc_seen_p = false;
+ ret->typedef_p = false;
+ ret->explicit_signed_p = false;
+ ret->deprecated_p = false;
+ ret->default_int_p = false;
+ ret->long_p = false;
+ ret->long_long_p = false;
+ ret->short_p = false;
+ ret->signed_p = false;
+ ret->unsigned_p = false;
+ ret->complex_p = false;
+ ret->inline_p = false;
+ ret->thread_p = false;
+ ret->const_p = false;
+ ret->volatile_p = false;
+ ret->restrict_p = false;
+ return ret;
+}
- /* If only one translation unit seen, no copying necessary. */
- if (TREE_CHAIN (tu_list) == NULL_TREE)
- return;
+/* Add the type qualifier QUAL to the declaration specifiers SPECS,
+ returning SPECS. */
+
+struct c_declspecs *
+declspecs_add_qual (struct c_declspecs *specs, tree qual)
+{
+ enum rid i;
+ bool dupe = false;
+ specs->non_sc_seen_p = true;
+ gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
+ && C_IS_RESERVED_WORD (qual));
+ i = C_RID_CODE (qual);
+ switch (i)
+ {
+ case RID_CONST:
+ dupe = specs->const_p;
+ specs->const_p = true;
+ break;
+ case RID_VOLATILE:
+ dupe = specs->volatile_p;
+ specs->volatile_p = true;
+ break;
+ case RID_RESTRICT:
+ dupe = specs->restrict_p;
+ specs->restrict_p = true;
+ break;
+ default:
+ gcc_unreachable ();
+ }
+ if (dupe && pedantic && !flag_isoc99)
+ pedwarn ("duplicate %qs", IDENTIFIER_POINTER (qual));
+ return specs;
+}
+
+/* Add the type specifier TYPE to the declaration specifiers SPECS,
+ returning SPECS. */
- link_hash_table = htab_create (1021, link_hash_hash, link_hash_eq, NULL);
+struct c_declspecs *
+declspecs_add_type (struct c_declspecs *specs, tree type)
+{
+ specs->non_sc_seen_p = true;
+ if (TREE_DEPRECATED (type))
+ specs->deprecated_p = true;
- /* Enter any actual definitions into the hash table. */
- for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
- for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
- if (TREE_PUBLIC (decl) && ! DECL_EXTERNAL (decl))
+ /* Handle type specifier keywords. */
+ if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
+ {
+ enum rid i = C_RID_CODE (type);
+ if (specs->type)
{
- PTR *slot;
- slot = htab_find_slot (link_hash_table, decl, INSERT);
-
- /* If we've already got a definition, work out which one is
- the real one, put it into the hash table, and make the
- other one DECL_EXTERNAL. This is important to avoid
- putting out two definitions of the same symbol in the
- assembly output. */
- if (*slot != NULL)
+ error ("two or more data types in declaration specifiers");
+ return specs;
+ }
+ if ((int) i <= (int) RID_LAST_MODIFIER)
+ {
+ /* "long", "short", "signed", "unsigned" or "_Complex". */
+ bool dupe = false;
+ switch (i)
{
- tree old_decl = (tree) *slot;
-
- /* If this is weak or common or whatever, suppress it
- in favour of the other definition. */
- if (DECL_WEAK (decl))
- DECL_EXTERNAL (decl) = 1;
- else if (DECL_WEAK (old_decl) && ! DECL_WEAK (decl))
- DECL_EXTERNAL (old_decl) = 1;
- else if (DECL_COMMON (decl) || DECL_ONE_ONLY (decl))
- DECL_EXTERNAL (decl) = 1;
- else if (DECL_COMMON (old_decl) || DECL_ONE_ONLY (old_decl))
- DECL_EXTERNAL (old_decl) = 1;
-
- if (DECL_EXTERNAL (decl))
+ case RID_LONG:
+ if (specs->long_long_p)
{
- DECL_INITIAL (decl) = NULL_TREE;
- DECL_COMMON (decl) = 0;
- DECL_ONE_ONLY (decl) = 0;
- DECL_WEAK (decl) = 0;
+ error ("%<long long long%> is too long for GCC");
+ break;
}
- else if (DECL_EXTERNAL (old_decl))
+ if (specs->long_p)
{
- DECL_INITIAL (old_decl) = NULL_TREE;
- DECL_COMMON (old_decl) = 0;
- DECL_ONE_ONLY (old_decl) = 0;
- DECL_WEAK (old_decl) = 0;
- *slot = decl;
+ if (specs->typespec_word == cts_double)
+ {
+ error ("both %<long long%> and %<double%> in "
+ "declaration specifiers");
+ break;
+ }
+ if (pedantic && !flag_isoc99 && !in_system_header
+ && warn_long_long)
+ pedwarn ("ISO C90 does not support %<long long%>");
+ specs->long_long_p = 1;
+ break;
}
+ if (specs->short_p)
+ error ("both %<long%> and %<short%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_void)
+ error ("both %<long%> and %<void%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_bool)
+ error ("both %<long%> and %<_Bool%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_char)
+ error ("both %<long%> and %<char%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_float)
+ error ("both %<long%> and %<float%> in "
+ "declaration specifiers");
else
- {
- error_with_decl (decl, "redefinition of global `%s'");
- error_with_decl (old_decl, "`%s' previously defined here");
- }
+ specs->long_p = true;
+ break;
+ case RID_SHORT:
+ dupe = specs->short_p;
+ if (specs->long_p)
+ error ("both %<long%> and %<short%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_void)
+ error ("both %<short%> and %<void%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_bool)
+ error ("both %<short%> and %<_Bool%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_char)
+ error ("both %<short%> and %<char%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_float)
+ error ("both %<short%> and %<float%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_double)
+ error ("both %<short%> and %<double%> in "
+ "declaration specifiers");
+ else
+ specs->short_p = true;
+ break;
+ case RID_SIGNED:
+ dupe = specs->signed_p;
+ if (specs->unsigned_p)
+ error ("both %<signed%> and %<unsigned%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_void)
+ error ("both %<signed%> and %<void%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_bool)
+ error ("both %<signed%> and %<_Bool%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_float)
+ error ("both %<signed%> and %<float%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_double)
+ error ("both %<signed%> and %<double%> in "
+ "declaration specifiers");
+ else
+ specs->signed_p = true;
+ break;
+ case RID_UNSIGNED:
+ dupe = specs->unsigned_p;
+ if (specs->signed_p)
+ error ("both %<signed%> and %<unsigned%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_void)
+ error ("both %<unsigned%> and %<void%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_bool)
+ error ("both %<unsigned%> and %<_Bool%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_float)
+ error ("both %<unsigned%> and %<float%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_double)
+ error ("both %<unsigned%> and %<double%> in "
+ "declaration specifiers");
+ else
+ specs->unsigned_p = true;
+ break;
+ case RID_COMPLEX:
+ dupe = specs->complex_p;
+ if (pedantic && !flag_isoc99 && !in_system_header)
+ pedwarn ("ISO C90 does not support complex types");
+ if (specs->typespec_word == cts_void)
+ error ("both %<complex%> and %<void%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_bool)
+ error ("both %<complex%> and %<_Bool%> in "
+ "declaration specifiers");
+ else
+ specs->complex_p = true;
+ break;
+ default:
+ gcc_unreachable ();
+ }
+
+ if (dupe)
+ error ("duplicate %qs", IDENTIFIER_POINTER (type));
+
+ return specs;
+ }
+ else
+ {
+ /* "void", "_Bool", "char", "int", "float" or "double". */
+ if (specs->typespec_word != cts_none)
+ {
+ error ("two or more data types in declaration specifiers");
+ return specs;
+ }
+ switch (i)
+ {
+ case RID_VOID:
+ if (specs->long_p)
+ error ("both %<long%> and %<void%> in "
+ "declaration specifiers");
+ else if (specs->short_p)
+ error ("both %<short%> and %<void%> in "
+ "declaration specifiers");
+ else if (specs->signed_p)
+ error ("both %<signed%> and %<void%> in "
+ "declaration specifiers");
+ else if (specs->unsigned_p)
+ error ("both %<unsigned%> and %<void%> in "
+ "declaration specifiers");
+ else if (specs->complex_p)
+ error ("both %<complex%> and %<void%> in "
+ "declaration specifiers");
+ else
+ specs->typespec_word = cts_void;
+ return specs;
+ case RID_BOOL:
+ if (specs->long_p)
+ error ("both %<long%> and %<_Bool%> in "
+ "declaration specifiers");
+ else if (specs->short_p)
+ error ("both %<short%> and %<_Bool%> in "
+ "declaration specifiers");
+ else if (specs->signed_p)
+ error ("both %<signed%> and %<_Bool%> in "
+ "declaration specifiers");
+ else if (specs->unsigned_p)
+ error ("both %<unsigned%> and %<_Bool%> in "
+ "declaration specifiers");
+ else if (specs->complex_p)
+ error ("both %<complex%> and %<_Bool%> in "
+ "declaration specifiers");
+ else
+ specs->typespec_word = cts_bool;
+ return specs;
+ case RID_CHAR:
+ if (specs->long_p)
+ error ("both %<long%> and %<char%> in "
+ "declaration specifiers");
+ else if (specs->short_p)
+ error ("both %<short%> and %<char%> in "
+ "declaration specifiers");
+ else
+ specs->typespec_word = cts_char;
+ return specs;
+ case RID_INT:
+ specs->typespec_word = cts_int;
+ return specs;
+ case RID_FLOAT:
+ if (specs->long_p)
+ error ("both %<long%> and %<float%> in "
+ "declaration specifiers");
+ else if (specs->short_p)
+ error ("both %<short%> and %<float%> in "
+ "declaration specifiers");
+ else if (specs->signed_p)
+ error ("both %<signed%> and %<float%> in "
+ "declaration specifiers");
+ else if (specs->unsigned_p)
+ error ("both %<unsigned%> and %<float%> in "
+ "declaration specifiers");
+ else
+ specs->typespec_word = cts_float;
+ return specs;
+ case RID_DOUBLE:
+ if (specs->long_long_p)
+ error ("both %<long long%> and %<double%> in "
+ "declaration specifiers");
+ else if (specs->short_p)
+ error ("both %<short%> and %<double%> in "
+ "declaration specifiers");
+ else if (specs->signed_p)
+ error ("both %<signed%> and %<double%> in "
+ "declaration specifiers");
+ else if (specs->unsigned_p)
+ error ("both %<unsigned%> and %<double%> in "
+ "declaration specifiers");
+ else
+ specs->typespec_word = cts_double;
+ return specs;
+ default:
+ /* ObjC reserved word "id", handled below. */
+ break;
}
- else
- *slot = decl;
}
+ }
- /* Now insert the desired information from all the definitions
- into any plain declarations. */
- for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
- for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
- if (TREE_PUBLIC (decl) && DECL_EXTERNAL (decl))
+ /* Now we have a typedef (a TYPE_DECL node), an identifier (some
+ form of ObjC type, cases such as "int" and "long" being handled
+ above), a TYPE (struct, union, enum and typeof specifiers) or an
+ ERROR_MARK. In none of these cases may there have previously
+ been any type specifiers. */
+ if (specs->type || specs->typespec_word != cts_none
+ || specs->long_p || specs->short_p || specs->signed_p
+ || specs->unsigned_p || specs->complex_p)
+ error ("two or more data types in declaration specifiers");
+ else if (TREE_CODE (type) == TYPE_DECL)
+ {
+ if (TREE_TYPE (type) == error_mark_node)
+ ; /* Allow the type to default to int to avoid cascading errors. */
+ else
{
- tree global_decl;
- global_decl = (tree) htab_find (link_hash_table, decl);
-
- if (! global_decl)
- continue;
-
- /* Print any appropriate error messages, and partially merge
- the decls. */
- (void) duplicate_decls (decl, global_decl, true, true);
+ specs->type = TREE_TYPE (type);
+ specs->decl_attr = DECL_ATTRIBUTES (type);
+ specs->typedef_p = true;
+ specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
}
+ }
+ else if (TREE_CODE (type) == IDENTIFIER_NODE)
+ {
+ tree t = lookup_name (type);
+ if (!t || TREE_CODE (t) != TYPE_DECL)
+ error ("%qs fails to be a typedef or built in type",
+ IDENTIFIER_POINTER (type));
+ else if (TREE_TYPE (t) == error_mark_node)
+ ;
+ else
+ specs->type = TREE_TYPE (t);
+ }
+ else if (TREE_CODE (type) != ERROR_MARK)
+ specs->type = type;
- htab_delete (link_hash_table);
+ return specs;
}
-/* Perform final processing on file-scope data. */
+/* Add the storage class specifier or function specifier SCSPEC to the
+ declaration specifiers SPECS, returning SPECS. */
-void
-c_write_global_declarations(void)
+struct c_declspecs *
+declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
{
- tree link;
-
- for (link = current_file_decl; link; link = TREE_CHAIN (link))
+ enum rid i;
+ enum c_storage_class n = csc_none;
+ bool dupe = false;
+ gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
+ && C_IS_RESERVED_WORD (scspec));
+ i = C_RID_CODE (scspec);
+ if (extra_warnings && specs->non_sc_seen_p)
+ warning ("%qs is not at beginning of declaration",
+ IDENTIFIER_POINTER (scspec));
+ switch (i)
+ {
+ case RID_INLINE:
+ /* C99 permits duplicate inline. Although of doubtful utility,
+ it seems simplest to permit it in gnu89 mode as well, as
+ there is also little utility in maintaining this as a
+ difference between gnu89 and C99 inline. */
+ dupe = false;
+ specs->inline_p = true;
+ break;
+ case RID_THREAD:
+ dupe = specs->thread_p;
+ if (specs->storage_class == csc_auto)
+ error ("%<__thread%> used with %<auto%>");
+ else if (specs->storage_class == csc_register)
+ error ("%<__thread%> used with %<register%>");
+ else if (specs->storage_class == csc_typedef)
+ error ("%<__thread%> used with %<typedef%>");
+ else
+ specs->thread_p = true;
+ break;
+ case RID_AUTO:
+ n = csc_auto;
+ break;
+ case RID_EXTERN:
+ n = csc_extern;
+ /* Diagnose "__thread extern". */
+ if (specs->thread_p)
+ error ("%<__thread%> before %<extern%>");
+ break;
+ case RID_REGISTER:
+ n = csc_register;
+ break;
+ case RID_STATIC:
+ n = csc_static;
+ /* Diagnose "__thread static". */
+ if (specs->thread_p)
+ error ("%<__thread%> before %<static%>");
+ break;
+ case RID_TYPEDEF:
+ n = csc_typedef;
+ break;
+ default:
+ gcc_unreachable ();
+ }
+ if (n != csc_none && n == specs->storage_class)
+ dupe = true;
+ if (dupe)
+ error ("duplicate %qs", IDENTIFIER_POINTER (scspec));
+ if (n != csc_none)
{
- tree globals = BLOCK_VARS (DECL_INITIAL (link));
- int len = list_length (globals);
- tree *vec = (tree *) xmalloc (sizeof (tree) * len);
- int i;
- tree decl;
-
- /* Process the decls in reverse order--earliest first.
- Put them into VEC from back to front, then take out from front. */
-
- for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
- vec[len - i - 1] = decl;
-
- wrapup_global_declarations (vec, len);
-
- check_global_declarations (vec, len);
-
- /* Clean up. */
- free (vec);
+ if (specs->storage_class != csc_none && n != specs->storage_class)
+ {
+ error ("multiple storage classes in declaration specifiers");
+ }
+ else
+ {
+ specs->storage_class = n;
+ if (n != csc_extern && n != csc_static && specs->thread_p)
+ {
+ error ("%<__thread%> used with %qs",
+ IDENTIFIER_POINTER (scspec));
+ specs->thread_p = false;
+ }
+ }
+ }
+ return specs;
+}
+
+/* Add the attributes ATTRS to the declaration specifiers SPECS,
+ returning SPECS. */
+
+struct c_declspecs *
+declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
+{
+ specs->attrs = chainon (attrs, specs->attrs);
+ return specs;
+}
+
+/* Combine "long", "short", "signed", "unsigned" and "_Complex" type
+ specifiers with any other type specifier to determine the resulting
+ type. This is where ISO C checks on complex types are made, since
+ "_Complex long" is a prefix of the valid ISO C type "_Complex long
+ double". */
+
+struct c_declspecs *
+finish_declspecs (struct c_declspecs *specs)
+{
+ /* If a type was specified as a whole, we have no modifiers and are
+ done. */
+ if (specs->type != NULL_TREE)
+ {
+ gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
+ && !specs->signed_p && !specs->unsigned_p
+ && !specs->complex_p);
+ return specs;
+ }
+
+ /* If none of "void", "_Bool", "char", "int", "float" or "double"
+ has been specified, treat it as "int" unless "_Complex" is
+ present and there are no other specifiers. If we just have
+ "_Complex", it is equivalent to "_Complex double", but e.g.
+ "_Complex short" is equivalent to "_Complex short int". */
+ if (specs->typespec_word == cts_none)
+ {
+ if (specs->long_p || specs->short_p
+ || specs->signed_p || specs->unsigned_p)
+ {
+ specs->typespec_word = cts_int;
+ }
+ else if (specs->complex_p)
+ {
+ specs->typespec_word = cts_double;
+ if (pedantic)
+ pedwarn ("ISO C does not support plain %<complex%> meaning "
+ "%<double complex%>");
+ }
+ else
+ {
+ specs->typespec_word = cts_int;
+ specs->default_int_p = true;
+ /* We don't diagnose this here because grokdeclarator will
+ give more specific diagnostics according to whether it is
+ a function definition. */
+ }
+ }
+
+ /* If "signed" was specified, record this to distinguish "int" and
+ "signed int" in the case of a bit-field with
+ -funsigned-bitfields. */
+ specs->explicit_signed_p = specs->signed_p;
+
+ /* Now compute the actual type. */
+ switch (specs->typespec_word)
+ {
+ case cts_void:
+ gcc_assert (!specs->long_p && !specs->short_p
+ && !specs->signed_p && !specs->unsigned_p
+ && !specs->complex_p);
+ specs->type = void_type_node;
+ break;
+ case cts_bool:
+ gcc_assert (!specs->long_p && !specs->short_p
+ && !specs->signed_p && !specs->unsigned_p
+ && !specs->complex_p);
+ specs->type = boolean_type_node;
+ break;
+ case cts_char:
+ gcc_assert (!specs->long_p && !specs->short_p);
+ gcc_assert (!(specs->signed_p && specs->unsigned_p));
+ if (specs->signed_p)
+ specs->type = signed_char_type_node;
+ else if (specs->unsigned_p)
+ specs->type = unsigned_char_type_node;
+ else
+ specs->type = char_type_node;
+ if (specs->complex_p)
+ {
+ if (pedantic)
+ pedwarn ("ISO C does not support complex integer types");
+ specs->type = build_complex_type (specs->type);
+ }
+ break;
+ case cts_int:
+ gcc_assert (!(specs->long_p && specs->short_p));
+ gcc_assert (!(specs->signed_p && specs->unsigned_p));
+ if (specs->long_long_p)
+ specs->type = (specs->unsigned_p
+ ? long_long_unsigned_type_node
+ : long_long_integer_type_node);
+ else if (specs->long_p)
+ specs->type = (specs->unsigned_p
+ ? long_unsigned_type_node
+ : long_integer_type_node);
+ else if (specs->short_p)
+ specs->type = (specs->unsigned_p
+ ? short_unsigned_type_node
+ : short_integer_type_node);
+ else
+ specs->type = (specs->unsigned_p
+ ? unsigned_type_node
+ : integer_type_node);
+ if (specs->complex_p)
+ {
+ if (pedantic)
+ pedwarn ("ISO C does not support complex integer types");
+ specs->type = build_complex_type (specs->type);
+ }
+ break;
+ case cts_float:
+ gcc_assert (!specs->long_p && !specs->short_p
+ && !specs->signed_p && !specs->unsigned_p);
+ specs->type = (specs->complex_p
+ ? complex_float_type_node
+ : float_type_node);
+ break;
+ case cts_double:
+ gcc_assert (!specs->long_long_p && !specs->short_p
+ && !specs->signed_p && !specs->unsigned_p);
+ if (specs->long_p)
+ {
+ specs->type = (specs->complex_p
+ ? complex_long_double_type_node
+ : long_double_type_node);
+ }
+ else
+ {
+ specs->type = (specs->complex_p
+ ? complex_double_type_node
+ : double_type_node);
+ }
+ break;
+ default:
+ gcc_unreachable ();
}
+
+ return specs;
+}
+
+/* Synthesize a function which calls all the global ctors or global
+ dtors in this file. This is only used for targets which do not
+ support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
+static void
+build_cdtor (int method_type, tree cdtors)
+{
+ tree body = 0;
+
+ if (!cdtors)
+ return;
+
+ for (; cdtors; cdtors = TREE_CHAIN (cdtors))
+ append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0),
+ &body);
+
+ cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
}
-/* Reset the parser's state in preparation for a new file. */
+/* Perform final processing on one file scope's declarations (or the
+ external scope's declarations), GLOBALS. */
+static void
+c_write_global_declarations_1 (tree globals)
+{
+ size_t len = list_length (globals);
+ tree *vec = XNEWVEC (tree, len);
+ size_t i;
+ tree decl;
+
+ /* Process the decls in the order they were written. */
+ for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
+ {
+ vec[i] = decl;
+ /* Check for used but undefined static functions using the C
+ standard's definition of "used", and set TREE_NO_WARNING so
+ that check_global_declarations doesn't repeat the check. */
+ if (TREE_CODE (decl) == FUNCTION_DECL
+ && DECL_INITIAL (decl) == 0
+ && DECL_EXTERNAL (decl)
+ && !TREE_PUBLIC (decl)
+ && C_DECL_USED (decl))
+ {
+ pedwarn ("%J%qF used but never defined", decl, decl);
+ TREE_NO_WARNING (decl) = 1;
+ }
+ }
+
+ wrapup_global_declarations (vec, len);
+ check_global_declarations (vec, len);
+
+ free (vec);
+}
void
-c_reset_state (void)
+c_write_global_declarations (void)
{
- tree link;
- tree file_scope_decl;
-
- /* Pop the global binding level. */
- if (current_binding_level != global_binding_level)
- current_binding_level = global_binding_level;
- file_scope_decl = current_file_decl;
- DECL_INITIAL (file_scope_decl) = poplevel (1, 0, 0);
- truly_local_externals = NULL_TREE;
-
- /* Start a new global binding level. */
- pushlevel (0);
- global_binding_level = current_binding_level;
- current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
- TREE_CHAIN (current_file_decl) = file_scope_decl;
-
- /* Reintroduce the global declarations. */
- for (link = builtin_decls; link; link = TREE_CHAIN (link))
- pushdecl (copy_node (link));
+ tree ext_block, t;
+
+ /* We don't want to do this if generating a PCH. */
+ if (pch_file)
+ return;
+
+ /* Don't waste time on further processing if -fsyntax-only or we've
+ encountered errors. */
+ if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
+ return;
+
+ /* Close the external scope. */
+ ext_block = pop_scope ();
+ external_scope = 0;
+ gcc_assert (!current_scope);
+
+ /* Process all file scopes in this compilation, and the external_scope,
+ through wrapup_global_declarations and check_global_declarations. */
+ for (t = all_translation_units; t; t = TREE_CHAIN (t))
+ c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
+ c_write_global_declarations_1 (BLOCK_VARS (ext_block));
+
+ /* Generate functions to call static constructors and destructors
+ for targets that do not support .ctors/.dtors sections. These
+ functions have magic names which are detected by collect2. */
+ build_cdtor ('I', static_ctors); static_ctors = 0;
+ build_cdtor ('D', static_dtors); static_dtors = 0;
+
+ /* We're done parsing; proceed to optimize and emit assembly.
+ FIXME: shouldn't be the front end's responsibility to call this. */
+ cgraph_optimize ();
+
+ /* Presently this has to happen after cgraph_optimize.
+ FIXME: shouldn't be the front end's responsibility to call this. */
+ if (flag_mudflap)
+ mudflap_finish_file ();
}
#include "gt-c-decl.h"
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