/* 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
static int enum_overflow;
-/* Parsing a function declarator leaves a list of parameter names
- or a chain of parameter decls here. */
+/* These #defines are for clarity in working with the information block
+ returned by get_parm_info. */
+#define ARG_INFO_PARMS(args) TREE_PURPOSE(args)
+#define ARG_INFO_TAGS(args) TREE_VALUE(args)
+#define ARG_INFO_TYPES(args) TREE_CHAIN(args)
+#define ARG_INFO_OTHERS(args) TREE_TYPE(args)
-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;
-
-/* Similar, for last_function_parm_tags. */
-
-static tree current_function_parm_tags;
-
-/* Similar, for the file and line that the prototype came from if this is
- an old-style definition. */
+/* The file and line that the prototype came from if this is an
+ old-style definition; used for diagnostics in
+ store_parm_decls_oldstyle. */
static location_t current_function_prototype_locus;
static GTY(()) tree c_scope_stmt_stack;
-/* 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;
-
-/* A list of the builtin file-scope DECLs. */
+/* State saving variables. */
+int c_in_iteration_stmt;
+int c_in_case_stmt;
-static GTY(()) tree builtin_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. */
-/* A DECL for the current file-scope context. */
+static GTY(()) tree all_translation_units;
-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. Finally, the ->contour field points
+ back to the relevant scope structure; this is mainly used to make
+ decls in the externals scope invisible (see below).
+
+ 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. */
+
+struct c_binding GTY((chain_next ("%h.prev")))
+{
+ tree decl; /* the decl bound */
+ 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 */
+ struct c_scope *contour; /* the scope in which this decl is bound */
+};
+
+#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];
- /* 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;
+/* The resulting tree type. */
- /* 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;
+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;
+};
- /* 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;
+/* 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.
- /* 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;
+ Most declarations are recorded in the current scope.
- /* The scope containing this one. */
- struct binding_level *outer;
+ 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.
- /* The next outermost function scope. */
- struct binding_level *outer_function;
+ 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.
- /* True if we are currently filling this level with parameter
- declarations. */
- bool parm_flag : 1;
+ 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:
- /* True 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. */
- bool function_body : 1;
+ If, within the same translation unit, the same identifier appears
+ with both internal and external linkage, the behavior is
+ undefined.
- /* True means make a BLOCK for this level regardless of all else. */
- bool keep : 1;
+ All declarations that refer to the same object or function shall
+ have compatible type; otherwise, the behavior is undefined.
- /* True means make a BLOCK if this level has any subblocks. */
- bool keep_if_subblocks : 1;
+ Initially only the built-in declarations, which describe compiler
+ intrinsic functions plus a subset of the standard library, are in
+ this scope.
- /* List of decls in `names' that have incomplete structure or
- union types. */
- tree incomplete_list;
+ 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.)
- /* 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;
- };
+ The bindings list is strictly in reverse order of declarations;
+ pop_scope relies on this. */
-#define NULL_BINDING_LEVEL (struct binding_level *) NULL
-/* The binding level currently in effect. */
+struct c_scope GTY((chain_next ("%h.outer")))
+{
+ /* The scope containing this one. */
+ struct c_scope *outer;
-static GTY(()) struct binding_level *current_binding_level;
+ /* The next outermost function scope. */
+ struct c_scope *outer_function;
-/* A chain of binding_level structures awaiting reuse. */
+ /* All bindings in this scope. */
+ struct c_binding *bindings;
-static GTY((deletable (""))) struct binding_level *free_binding_level;
+ /* 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;
+
+ /* 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. */
-static GTY(()) struct binding_level *current_function_level;
-/* 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(()) struct c_scope *current_function_scope;
+
+/* The C file scope. This is reset for each input translation unit. */
+
+static GTY(()) struct c_scope *file_scope;
+
+/* The outermost scope. This is used for all declarations with
+ external linkage, and only these, hence the name. */
+
+static GTY(()) struct c_scope *external_scope;
-static GTY(()) struct binding_level *global_binding_level;
+/* A chain of c_scope structures awaiting reuse. */
-/* True means unconditionally make a BLOCK for the next level pushed. */
+static GTY((deletable)) struct c_scope *scope_freelist;
+
+/* A chain of c_binding structures awaiting reuse. */
+
+static GTY((deletable)) struct c_binding *binding_freelist;
+
+/* 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)
+
+/* 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)
+
+/* True means unconditionally make a BLOCK for the next scope pushed. */
static bool keep_next_level_flag;
-/* True means make a BLOCK for the next level pushed if it has subblocks. */
+/* 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 keep_next_if_subblocks;
+static bool next_is_function_body;
/* Functions called automatically at the beginning and end of execution. */
tree static_ctors, static_dtors;
/* Forward declarations. */
-
-static struct binding_level *make_binding_level (void);
-static void pop_binding_level (void);
-static int duplicate_decls (tree, tree, int, int);
-static int redeclaration_error_message (tree, tree);
-static tree make_label (tree, location_t);
-static void bind_label (tree, tree, struct binding_level *);
-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 lookup_name_in_scope (tree, struct c_scope *);
+static tree c_make_fname_decl (tree, int);
+static tree grokdeclarator (tree, tree, enum decl_context, int, tree *);
static tree grokparms (tree, int);
static void layout_array_type (tree);
-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 *);
\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)
+{
+ struct c_binding *b, **here;
+
+ if (binding_freelist)
+ {
+ b = binding_freelist;
+ binding_freelist = b->prev;
+ }
+ else
+ b = ggc_alloc (sizeof (struct c_binding));
+
+ b->shadowed = 0;
+ b->decl = decl;
+ b->id = name;
+ b->contour = scope;
+
+ 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:
+ abort ();
+ }
+
+ /* 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)->contour->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;
+
+ b->id = 0;
+ b->decl = 0;
+ b->contour = 0;
+ b->shadowed = 0;
+ 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)
&& ! DECL_EXTERNAL (decl)
&& TYPE_DOMAIN (type) == 0)
{
- warning ("%Harray '%D' assumed to have one element",
- &DECL_SOURCE_LOCATION (decl), decl);
+ warning ("%Jarray '%D' 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 *
+get_current_scope (void)
{
- struct binding_level *result;
- if (free_binding_level)
- {
- result = free_binding_level;
- free_binding_level = result->outer;
- }
- else
- result = ggc_alloc_cleared (sizeof (struct binding_level));
-
- return result;
+ return current_scope;
}
-/* Remove the topmost binding level from the stack and add it to the
- free list, updating current_function_level if necessary. */
+/* 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 (void)
+void
+objc_mark_locals_volatile (void *enclosing_blk)
{
- struct binding_level *scope = current_binding_level;
+ struct c_scope *scope;
+ struct c_binding *b;
- current_binding_level = scope->outer;
- if (scope->function_body)
- current_function_level = scope->outer_function;
+ 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 (scope, 0, sizeof (struct binding_level));
- scope->outer = free_binding_level;
- free_binding_level = scope;
+ /* 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_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 = true;
-}
-
-/* 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 (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 = false;
- current_binding_level->function_body = true;
- current_binding_level->keep |= keep_next_level_flag;
- current_binding_level->keep_if_subblocks = true;
- current_binding_level->outer_function = current_function_level;
- current_function_level = current_binding_level;
+ (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;
- keep_next_if_subblocks = false;
+ next_is_function_body = false;
}
else
{
- struct binding_level *newlevel = make_binding_level ();
+ struct c_scope *scope;
+ if (scope_freelist)
+ {
+ scope = scope_freelist;
+ scope_freelist = scope->outer;
+ }
+ else
+ scope = ggc_alloc_cleared (sizeof (struct c_scope));
+
+ scope->keep = keep_next_level_flag;
+ scope->outer = current_scope;
+ scope->depth = current_scope ? (current_scope->depth + 1) : 0;
- newlevel->keep = keep_next_level_flag;
- newlevel->outer = current_binding_level;
- current_binding_level = newlevel;
- keep_next_level_flag = false;
+ /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
+ possible. */
+ if (current_scope && scope->depth == 0)
+ {
+ scope->depth--;
+ sorry ("GCC supports only %u nested scopes\n", scope->depth);
+ }
+
+ current_scope = scope;
+ keep_next_level_flag = false;
}
}
-/* 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.
+/* 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 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.
+tree
+pop_scope (void)
+{
+ struct c_scope *scope = current_scope;
+ tree block, context, p;
+ struct c_binding *b;
- 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.
+ bool functionbody = scope->function_body;
+ bool keep = functionbody || scope->keep || scope->bindings;
- If REVERSE is nonzero, reverse the order of decls before putting
- them into the BLOCK. */
+ /* If appropriate, create a BLOCK to record the decls for the life
+ of this function. */
+ block = 0;
+ if (keep)
+ {
+ block = make_node (BLOCK);
+ BLOCK_SUBBLOCKS (block) = scope->blocks;
+ TREE_USED (block) = 1;
-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;
-
- functionbody |= current_binding_level->function_body;
-
- 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 (TREE_CODE (link) == LABEL_DECL)
+ /* In each subblock, record that this is its superior. */
+ for (p = scope->blocks; p; p = TREE_CHAIN (p))
+ BLOCK_SUPERCONTEXT (p) = block;
+
+ BLOCK_VARS (block) = 0;
+ }
+
+ /* 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;
+
+ /* Clear all bindings in this scope. */
+ for (b = scope->bindings; b; b = free_binding_and_advance (b))
+ {
+ p = b->decl;
+ switch (TREE_CODE (p))
{
- if (TREE_USED (link) && DECL_INITIAL (link) == 0)
+ case LABEL_DECL:
+ /* Warnings for unused labels, errors for undefined labels. */
+ if (TREE_USED (p) && !DECL_INITIAL (p))
{
- error ("%Hlabel `%D' used but not defined",
- &DECL_SOURCE_LOCATION (link), link);
- /* Avoid crashing later. */
- DECL_INITIAL (link) = error_mark_node;
+ error ("%Jlabel `%D' used but not defined", p, p);
+ DECL_INITIAL (p) = error_mark_node;
}
- else if (!TREE_USED (link) && warn_unused_label)
+ else if (!TREE_USED (p) && warn_unused_label)
{
- if (DECL_INITIAL (link) != 0)
- warning ("%Hlabel `%D' defined but not used",
- &DECL_SOURCE_LOCATION (link), link);
+ if (DECL_INITIAL (p))
+ warning ("%Jlabel `%D' defined but not used", p, p);
else
- warning ("%Hlabel `%D' declared but not defined",
- &DECL_SOURCE_LOCATION (link), link);
+ warning ("%Jlabel `%D' declared but not defined", p, p);
}
- IDENTIFIER_LABEL_VALUE (DECL_NAME (link)) = 0;
- }
- else if (DECL_NAME (link) != 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;
- }
-
- 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;
- }
+ /* Labels go in BLOCK_VARS. */
+ TREE_CHAIN (p) = BLOCK_VARS (block);
+ BLOCK_VARS (block) = p;
- /* 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- and label-meanings of the outer levels
- that were shadowed by this level. */
-
- for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
- if (TREE_VALUE (link) && TREE_CODE (TREE_VALUE (link)) == LABEL_DECL)
- IDENTIFIER_LABEL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
- else
- IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
-
- /* Restore all tag-meanings of the outer levels
- that were shadowed by this level. */
+#ifdef ENABLE_CHECKING
+ if (I_LABEL_BINDING (b->id) != b) abort ();
+#endif
+ I_LABEL_BINDING (b->id) = b->shadowed;
+ break;
- for (link = current_binding_level->shadowed_tags; link;
- link = TREE_CHAIN (link))
- IDENTIFIER_TAG_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
+ case ENUMERAL_TYPE:
+ case UNION_TYPE:
+ case RECORD_TYPE:
+ TYPE_CONTEXT (p) = context;
- /* 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);
+ /* Types may not have tag-names, in which case the type
+ appears in the bindings list with b->id NULL. */
+ if (b->id)
+ {
+#ifdef ENABLE_CHECKING
+ if (I_TAG_BINDING (b->id) != b) abort ();
+#endif
+ 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. Keep this in sync with
+ stmt.c:warn_about_unused_variables, which we cannot use
+ since it expects a different data structure. */
+ if (warn_unused_variable
+ && !TREE_USED (p)
+ && !DECL_IN_SYSTEM_HEADER (p)
+ && DECL_NAME (p)
+ && !DECL_ARTIFICIAL (p)
+ && (scope != file_scope
+ || (TREE_STATIC (p) && !TREE_PUBLIC (p)
+ && !TREE_THIS_VOLATILE (p)))
+ && scope != external_scope)
+ warning ("%Junused variable `%D'", 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 (!C_DECL_IN_EXTERNAL_SCOPE (p) || scope == external_scope)
+ {
+ TREE_CHAIN (p) = BLOCK_VARS (block);
+ BLOCK_VARS (block) = p;
+ }
+ /* If this is the file scope, must set DECL_CONTEXT on these. */
+ if (!C_DECL_IN_EXTERNAL_SCOPE (p) && scope == file_scope)
+ DECL_CONTEXT (p) = context;
+
+ /* 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)
+ {
+#ifdef ENABLE_CHECKING
+ if (I_SYMBOL_BINDING (b->id) != b) abort ();
+#endif
+ I_SYMBOL_BINDING (b->id) = b->shadowed;
+ }
+ break;
- TREE_CHAIN (link) = 0;
+ default:
+ abort ();
}
}
- /* 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. */
-
- if (reverse)
- decls = nreverse (decls);
- /* 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. */
-
- block = 0;
- if (keep)
+ /* Dispose of the block that we just made inside some higher level. */
+ if ((scope->function_body || scope == file_scope) && context)
{
- block = make_node (BLOCK);
- BLOCK_VARS (block) = decls;
- BLOCK_SUBBLOCKS (block) = subblocks;
- TREE_USED (block) = 1;
+ 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);
}
- /* In each subblock, record that this is its superior. */
-
- for (link = subblocks; link; link = TREE_CHAIN (link))
- BLOCK_SUPERCONTEXT (link) = 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;
- /* 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.
+ memset (scope, 0, sizeof (struct c_scope));
+ scope->outer = scope_freelist;
+ scope_freelist = scope;
- 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. */
+ return block;
+}
- decl = functionbody ? current_function_decl : block;
- if (decl)
- for (link = tags; link; link = TREE_CHAIN (link))
- TYPE_CONTEXT (TREE_VALUE (link)) = decl;
+void
+push_file_scope (void)
+{
+ tree decl;
- /* Pop the current level, and free the structure for reuse. */
- pop_binding_level ();
+ push_scope ();
+ file_scope = current_scope;
- /* 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);
+ start_fname_decls ();
- return block;
+ for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
+ bind (DECL_NAME (decl), decl, file_scope);
}
-/* 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. */
-
void
-insert_block (tree block)
+pop_file_scope (void)
{
- TREE_USED (block) = 1;
- current_binding_level->blocks
- = chainon (current_binding_level->blocks, block);
+ /* 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 ();
+
+ /* Kludge: don't actually pop the file scope if generating a
+ precompiled header, so that macros and local symbols are still
+ visible to the PCH generator. */
+ if (pch_file)
+ return;
+
+ /* And pop off the file scope. */
+ pop_scope ();
+ file_scope = 0;
+
+ cpp_undef_all (parse_in);
}
-/* 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. */
+/* 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. */
void
-set_block (tree block ATTRIBUTE_UNUSED)
+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);
/* 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. */
- If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
- Otherwise, return 0.
+static tree
+match_builtin_function_types (tree newtype, tree oldtype)
+{
+ tree newrettype, oldrettype;
+ tree newargs, oldargs;
+ tree trytype, tryargs;
- 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. */
+ /* Accept the return type of the new declaration if same modes. */
+ oldrettype = TREE_TYPE (oldtype);
+ newrettype = TREE_TYPE (newtype);
+
+ if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
+ return 0;
-static int
-duplicate_decls (tree newdecl, tree olddecl, int different_binding_level,
- int different_tu)
+ oldargs = TYPE_ARG_TYPES (oldtype);
+ newargs = TYPE_ARG_TYPES (newtype);
+ tryargs = newargs;
+
+ while (oldargs || newargs)
+ {
+ if (! oldargs
+ || ! newargs
+ || ! TREE_VALUE (oldargs)
+ || ! TREE_VALUE (newargs)
+ || TYPE_MODE (TREE_VALUE (oldargs))
+ != TYPE_MODE (TREE_VALUE (newargs)))
+ return 0;
+
+ oldargs = TREE_CHAIN (oldargs);
+ newargs = TREE_CHAIN (newargs);
+ }
+
+ trytype = build_function_type (newrettype, tryargs);
+ return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
+}
+
+/* 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)
{
- 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;
+ tree t;
- if (DECL_P (olddecl))
+ 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 (newdecl) == FUNCTION_DECL
- && TREE_CODE (olddecl) == FUNCTION_DECL
- && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
+ tree type = TREE_VALUE (t);
+
+ if (TREE_CHAIN (t) == 0
+ && TYPE_MAIN_VARIANT (type) != void_type_node)
{
- 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 ("%Hfunction '%D' redeclared as inline",
- &DECL_SOURCE_LOCATION (newdecl), newdecl);
- warning ("%Hprevious declaration of function '%D' "
- "with attribute noinline",
- &DECL_SOURCE_LOCATION (olddecl), olddecl);
- }
- else if (DECL_DECLARED_INLINE_P (olddecl)
- && DECL_UNINLINABLE (newdecl)
- && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
- {
- warning ("%Hfunction '%D' redeclared with attribute noinline",
- &DECL_SOURCE_LOCATION (newdecl), newdecl);
- warning ("%Hprevious declaration of function '%D' was inline",
- &DECL_SOURCE_LOCATION (olddecl), olddecl);
- }
+ inform ("a parameter list with an ellipsis can't match "
+ "an empty parameter name list declaration");
+ break;
}
- DECL_ATTRIBUTES (newdecl)
- = (*targetm.merge_decl_attributes) (olddecl, newdecl);
+ if (c_type_promotes_to (type) != type)
+ {
+ inform ("an argument type that has a default promotion can't match "
+ "an empty parameter name list declaration");
+ break;
+ }
}
+}
+
+/* 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;
+
+ /* ??? Elsewhere TYPE_MAIN_VARIANT is not used in this context. */
+#define END_OF_ARGLIST(t) (TYPE_MAIN_VARIANT (t) == void_type_node)
+
+ oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
+ newargs = TYPE_ARG_TYPES (newtype);
+ i = 1;
+
+ for (;;)
+ {
+ tree oldargtype = TREE_VALUE (oldargs);
+ tree newargtype = TREE_VALUE (newargs);
+
+ 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))
+ {
+ error ("%Jprototype for '%D' declares more arguments "
+ "than previous old-style definition", newdecl, newdecl);
+ return false;
+ }
+ else if (END_OF_ARGLIST (newargtype))
+ {
+ error ("%Jprototype for '%D' declares fewer arguments "
+ "than previous old-style definition", newdecl, newdecl);
+ return false;
+ }
+
+ /* Type for passing arg must be consistent with that declared
+ for the arg. */
+ else if (! comptypes (oldargtype, newargtype))
+ {
+ error ("%Jprototype for '%D' declares arg %d with incompatible type",
+ newdecl, newdecl, i);
+ return false;
+ }
+
+ 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 '%D' 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 '%D' was here"), decl, decl);
+ else if (C_DECL_IMPLICIT (decl))
+ diag (N_("%Jprevious implicit declaration of '%D' was here"), decl, decl);
+ else
+ diag (N_("%Jprevious declaration of '%D' 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 (TREE_CODE (newtype) == ERROR_MARK
- || TREE_CODE (oldtype) == ERROR_MARK)
- types_match = 0;
+ /* 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;
- /* 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. */
+ /* 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'%D' redeclared as different kind of symbol",
+ newdecl, newdecl);
+ locate_old_decl (olddecl, error);
+ }
+ else if (TREE_PUBLIC (newdecl))
+ warning ("%Jbuilt-in function '%D' declared as non-function",
+ newdecl, newdecl);
+ else if (warn_shadow)
+ warning ("%Jdeclaration of '%D' shadows a built-in function",
+ newdecl, newdecl);
+ return false;
+ }
+
+ if (!comptypes (oldtype, newtype))
+ {
if (TREE_CODE (olddecl) == FUNCTION_DECL
- && DECL_BUILT_IN (olddecl))
+ && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
{
- /* 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))
+ /* Accept harmless mismatch in function types.
+ This is for the ffs and fprintf builtins. */
+ tree trytype = match_builtin_function_types (newtype, oldtype);
+
+ if (trytype && comptypes (newtype, trytype))
+ *oldtypep = oldtype = trytype;
+ else
{
- if (warn_shadow)
- warning ("%Hshadowing built-in function '%D'",
- &DECL_SOURCE_LOCATION (newdecl), newdecl);
+ /* 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 '%D'",
+ newdecl, newdecl);
+ return false;
}
- else
- warning ("%Hbuilt-in function '%D' declared as non-function",
- &DECL_SOURCE_LOCATION (newdecl), newdecl);
+ }
+ else if (TREE_CODE (olddecl) == FUNCTION_DECL
+ && DECL_SOURCE_LINE (olddecl) == 0)
+ {
+ /* 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 '%D'", 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 ("%H'%D' redeclared as different kind of symbol",
- &DECL_SOURCE_LOCATION (newdecl), newdecl);
- error ("%Hprevious declaration of '%D'",
- &DECL_SOURCE_LOCATION (olddecl), olddecl);
+ if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
+ error ("%J conflicting type qualifiers for '%D'", newdecl, newdecl);
+ else
+ error ("%Jconflicting types for '%D'", newdecl, newdecl);
+ diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
+ locate_old_decl (olddecl, error);
+ return false;
}
-
- 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))
+ /* 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)
{
- TREE_ASM_WRITTEN (olddecl) = 0;
- return 1;
- }
+ if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
+ return true; /* Allow OLDDECL to continue in use. */
- /* 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. */
+ error ("%Jredefinition of typedef '%D'", newdecl, newdecl);
+ locate_old_decl (olddecl, error);
+ return false;
+ }
- if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
+ /* 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)
{
- /* A function declaration for a built-in function. */
- if (!TREE_PUBLIC (newdecl))
+ /* 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 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 ("%Hshadowing built-in function '%D'",
- &DECL_SOURCE_LOCATION (newdecl), newdecl);
+ warning ("%Jdeclaration of '%D' shadows a built-in function",
+ newdecl, newdecl);
/* Discard the old built-in function. */
- return 0;
+ return false;
}
- 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);
- 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)))))
+ if (DECL_INITIAL (newdecl))
+ {
+ if (DECL_INITIAL (olddecl)
+ && !(DECL_DECLARED_INLINE_P (olddecl)
+ && DECL_EXTERNAL (olddecl)
+ && !(DECL_DECLARED_INLINE_P (newdecl)
+ && DECL_EXTERNAL (newdecl))))
{
- /* 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;
+ error ("%Jredefinition of '%D'", newdecl, newdecl);
+ locate_old_decl (olddecl, error);
+ return false;
}
- if (! different_binding_level)
- TREE_TYPE (olddecl) = oldtype;
}
- else if (TYPE_ARG_TYPES (oldtype) == NULL
- && TYPE_ARG_TYPES (newtype) != NULL)
+ /* 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))
{
- /* 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;
+ locate_old_decl (olddecl, error);
+ return false;
+ }
+ /* Mismatched non-static and static is considered poor style.
+ We only diagnose static then non-static if -Wtraditional,
+ because it 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). Revisit? */
+ if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
+ {
+ /* A static function declaration for a predeclared function
+ that isn't actually built in, silently overrides the
+ default. Objective C uses these. See also above.
+ FIXME: Make Objective C use normal builtins. */
+ if (TREE_CODE (olddecl) == FUNCTION_DECL
+ && DECL_SOURCE_LINE (olddecl) == 0)
+ return false;
+ else
+ {
+ warning ("%Jstatic declaration of '%D' follows "
+ "non-static declaration", newdecl, newdecl);
+ warned = true;
+ }
}
- if (!types_match)
+ else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl)
+ && warn_traditional)
{
- /* If types don't match for a built-in, throw away the built-in. */
- warning ("%Hconflicting types for built-in function '%D'",
- &DECL_SOURCE_LOCATION (newdecl), newdecl);
- return 0;
+ warning ("%Jnon-static declaration of '%D' follows "
+ "static declaration", newdecl, newdecl);
+ warned = true;
}
}
- else if (TREE_CODE (olddecl) == FUNCTION_DECL
- && DECL_SOURCE_LINE (olddecl) == 0)
+ else if (TREE_CODE (newdecl) == VAR_DECL)
{
- /* A function declaration for a predeclared function
- that isn't actually built in. */
- if (!TREE_PUBLIC (newdecl))
+ /* Only variables can be thread-local, and all declarations must
+ agree on this property. */
+ if (DECL_THREAD_LOCAL (newdecl) != DECL_THREAD_LOCAL (olddecl))
{
- /* If you declare it as static, the
- default definition is overridden. */
- return 0;
+ if (DECL_THREAD_LOCAL (newdecl))
+ error ("%Jthread-local declaration of '%D' follows "
+ "non-thread-local declaration", newdecl, newdecl);
+ else
+ error ("%Jnon-thread-local declaration of '%D' follows "
+ "thread-local declaration", newdecl, newdecl);
+
+ locate_old_decl (olddecl, error);
+ return false;
}
- else if (!types_match)
+
+ /* Multiple initialized definitions are not allowed (6.9p3,5). */
+ if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
{
- /* 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);
+ error ("%Jredefinition of '%D'", newdecl, newdecl);
+ locate_old_decl (olddecl, error);
+ 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)))
- {
- if (pedantic)
- pedwarn ("%Hconflicting types for '%D'",
- &DECL_SOURCE_LOCATION (newdecl), newdecl);
- /* 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 ("%Hconflicting types for '%D'",
- &DECL_SOURCE_LOCATION (newdecl), newdecl);
- /* 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 ("%Hconflicting types for '%D'",
- &DECL_SOURCE_LOCATION (newdecl), newdecl);
- /* 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)))
+
+ /* Objects declared at file scope: if at least one is 'extern',
+ it's fine (6.2.2p4); otherwise the linkage must agree (6.2.2p7). */
+ if (DECL_FILE_SCOPE_P (newdecl))
{
- /* Classify the problem further. */
- tree t = TYPE_ARG_TYPES (oldtype);
- if (t == 0)
- t = TYPE_ARG_TYPES (newtype);
- for (; t; t = TREE_CHAIN (t))
+ if (!DECL_EXTERNAL (newdecl)
+ && !DECL_EXTERNAL (olddecl)
+ && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
{
- 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;
- }
+ if (TREE_PUBLIC (newdecl))
+ error ("%Jnon-static declaration of '%D' follows "
+ "static declaration", newdecl, newdecl);
+ else
+ error ("%Jstatic declaration of '%D' follows "
+ "non-static declaration", newdecl, newdecl);
- 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;
- }
+ locate_old_decl (olddecl, error);
+ return false;
}
}
- if (C_DECL_IMPLICIT (olddecl))
- error ("%Hprevious implicit declaration of '%D'",
- &DECL_SOURCE_LOCATION (olddecl), olddecl);
- else
- error ("%Hprevious declaration of '%D'",
- &DECL_SOURCE_LOCATION (olddecl), olddecl);
+ /* Two objects with the same name declared at the same block
+ scope must both be external references (6.7p3). */
+ else if (DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl)
+ && (!DECL_EXTERNAL (newdecl) || !DECL_EXTERNAL (olddecl)))
+ {
+ if (DECL_EXTERNAL (newdecl))
+ error ("%Jextern declaration of '%D' follows "
+ "declaration with no linkage", newdecl, newdecl);
+ else if (DECL_EXTERNAL (olddecl))
+ error ("%Jdeclaration of '%D' with no linkage follows "
+ "extern declaration", newdecl, newdecl);
+ else
+ error ("%Jredeclaration of '%D' with no linkage",
+ newdecl, newdecl);
- /* 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 ("%Hthread-local declaration of '%D' follows non thread-local "
- "declaration", &DECL_SOURCE_LOCATION (newdecl), newdecl);
- error ("%Hprevious declaration of '%D'",
- &DECL_SOURCE_LOCATION (olddecl), olddecl);
+ 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))
+
+ /* warnings */
+ /* All decls must agree on a non-default visibility. */
+ if (DECL_VISIBILITY (newdecl) != VISIBILITY_DEFAULT
+ && DECL_VISIBILITY (olddecl) != VISIBILITY_DEFAULT
+ && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
{
- error ("%Hnon thread-local declaration of '%D' follows "
- "thread-local declaration",
- &DECL_SOURCE_LOCATION (newdecl), newdecl);
- error ("%Hprevious declaration of '%D'",
- &DECL_SOURCE_LOCATION (olddecl), olddecl);
+ warning ("%Jredeclaration of '%D' with different visibility "
+ "(old visibility preserved)", newdecl, newdecl);
+ warned = true;
}
- else
+
+ if (TREE_CODE (newdecl) == FUNCTION_DECL)
{
- errmsg = redeclaration_error_message (newdecl, olddecl);
- if (errmsg)
+ /* Diagnose inline __attribute__ ((noinline)) which is silly. */
+ if (DECL_DECLARED_INLINE_P (newdecl)
+ && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
{
- const location_t *locus = &DECL_SOURCE_LOCATION (newdecl);
- switch (errmsg)
- {
- case 1:
- error ("%Hredefinition of '%D'", locus, newdecl);
- break;
- case 2:
- error ("%Hredeclaration of '%D'", locus, newdecl);
- break;
- case 3:
- error ("%Hconflicting declarations of '%D'", locus, newdecl);
- break;
- default:
- abort ();
- }
-
- locus = &DECL_SOURCE_LOCATION (olddecl);
- if (DECL_INITIAL (olddecl)
- && current_binding_level == global_binding_level)
- error ("%H'%D' previously defined here", locus, olddecl);
- else
- error ("%H'%D' previously declared here", locus, olddecl);
- return 0;
+ warning ("%Jinline declaration of '%D' follows "
+ "declaration with attribute noinline", newdecl, newdecl);
+ warned = true;
}
- else if (TREE_CODE (newdecl) == TYPE_DECL
- && (DECL_IN_SYSTEM_HEADER (olddecl)
- || DECL_IN_SYSTEM_HEADER (newdecl)))
+ else if (DECL_DECLARED_INLINE_P (olddecl)
+ && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
{
- const location_t *locus = &DECL_SOURCE_LOCATION (newdecl);
- warning ("%Hredefinition of '%D'", locus, newdecl);
- locus = &DECL_SOURCE_LOCATION (olddecl);
- if (DECL_INITIAL (olddecl)
- && current_binding_level == global_binding_level)
- warning ("%H'%D' previously defined here", locus, olddecl);
- else
- warning ("%H'%D' previously declared here", locus, olddecl);
+ warning ("%Jdeclaration of '%D' with attribute noinline follows "
+ "inline declaration ", newdecl, newdecl);
+ warned = true;
}
- 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)
+
+ /* 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? */
+ if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (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 (TREE_USED (olddecl))
{
- if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
- && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
- {
- const location_t *locus = &DECL_SOURCE_LOCATION (newdecl);
- warning ("%Hprototype for '%D' follows", locus, newdecl);
- locus = &DECL_SOURCE_LOCATION (olddecl);
- warning ("%Hnon-prototype definition here", locus);
- break;
- }
- if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
- || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
- {
- const location_t *locus = &DECL_SOURCE_LOCATION (newdecl);
- error ("%Hprototype for '%D' follows and number of "
- "arguments doesn't match", locus, newdecl);
- locus = &DECL_SOURCE_LOCATION (olddecl);
- error ("%Hnon-prototype definition here", locus);
- errmsg = 1;
- break;
- }
- /* Type for passing arg must be consistent
- with that declared for the arg. */
- if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type),
- comptype_flags))
- {
- const location_t *locus = &DECL_SOURCE_LOCATION (newdecl);
- error ("%Hprototype for '%D' follows and argument %d "
- "doesn't match", locus, newdecl, nargs);
- locus = &DECL_SOURCE_LOCATION (olddecl);
- error ("%Hnon-prototype definition here", locus);
- errmsg = 1;
- break;
- }
+ warning ("%J'%D' declared inline after being called",
+ olddecl, olddecl);
+ warned = true;
+ }
+ else if (DECL_INITIAL (olddecl))
+ {
+ warning ("%J'%D' declared inline after its definition",
+ olddecl, olddecl);
+ warned = true;
}
}
- /* Warn about mismatches in various flags. */
- 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)))
{
- /* 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 ("%H'%D' declared inline after being called",
- &DECL_SOURCE_LOCATION (newdecl), newdecl);
- if (TREE_CODE (olddecl) == FUNCTION_DECL
- && ! DECL_DECLARED_INLINE_P (olddecl)
- && DECL_DECLARED_INLINE_P (newdecl)
- && DECL_INITIAL (olddecl) != 0)
- warning ("%H'%D' declared inline after its definition",
- &DECL_SOURCE_LOCATION (newdecl), newdecl);
-
- /* 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 ("%Hstatic declaration for '%D' follows non-static",
- &DECL_SOURCE_LOCATION (newdecl), newdecl);
-
- /* 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 ("%Hnon-static declaration for '%D' follows static",
- &DECL_SOURCE_LOCATION (newdecl), newdecl);
-
- /* 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 ("%Hconst declaration for '%D' follows non-const",
- &DECL_SOURCE_LOCATION (newdecl), newdecl);
- /* 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 ("%Htype qualifiers for '%D' conflict with previous "
- "declaration", &DECL_SOURCE_LOCATION (newdecl), newdecl);
+ error ("%Jredefinition of parameter '%D'", 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)))
+ /* 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 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 ("%Hredundant redeclaration of '%D' in same scope",
- &DECL_SOURCE_LOCATION (newdecl), newdecl);
- warning ("%Hprevious declaration of '%D'",
- &DECL_SOURCE_LOCATION (olddecl), olddecl);
+ warning ("%Jredundant redeclaration of '%D'", 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.
+ /* Report location of previous decl/defn in a consistent manner. */
+ if (warned || pedwarned)
+ locate_old_decl (olddecl, pedwarned ? pedwarn : warning);
+
+ return true;
+}
+
+/* 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. */
- Past this point, we don't change OLDTYPE and NEWTYPE
- even if we change the types of NEWDECL and 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);
- if (types_match)
+ /* 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))
{
- /* 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;
+ struct c_binding *b, **here;
- /* Merge the data types specified in the two decls. */
- if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (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);
- }
+ for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
+ if ((*here)->decl == olddecl)
+ goto found;
+ abort ();
- /* Lay the type out, unless already done. */
- if (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);
- }
- }
+ 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 (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);
+ }
+ }
+
+ /* 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);
+ }
- /* Keep the old rtl since we can safely use it. */
- COPY_DECL_RTL (olddecl, newdecl);
+ /* 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 type qualifiers. */
- if (TREE_READONLY (newdecl))
- TREE_READONLY (write_olddecl) = 1;
+ /* 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;
- 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);
- }
+ /* Merge the initialization information. */
+ if (DECL_INITIAL (newdecl) == 0)
+ DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
- /* 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);
- }
+ /* 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);
- /* 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);
- }
- }
- /* If cannot merge, then use the new type and qualifiers,
- and don't preserve the old rtl. */
- else if (! different_binding_level)
+ /* Copy the assembler name.
+ Currently, it can only be defined in the prototype. */
+ COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
+
+ /* If either declaration has a nondefault visibility, use it. */
+ if (DECL_VISIBILITY (olddecl) != VISIBILITY_DEFAULT)
+ DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
+
+ 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 (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))
{
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)
{
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
{
DECL_INLINE (newdecl) = 1;
DECL_ABSTRACT_ORIGIN (newdecl)
- = (different_binding_level
- ? DECL_ORIGIN (olddecl)
- : DECL_ABSTRACT_ORIGIN (olddecl));
+ = DECL_ABSTRACT_ORIGIN (olddecl);
}
}
else
DECL_INLINE (newdecl) = 1;
}
}
- if (different_binding_level)
- return 0;
+
+ /* This bit must not get wiped out. */
+ C_DECL_IN_EXTERNAL_SCOPE (newdecl) |= C_DECL_IN_EXTERNAL_SCOPE (olddecl);
/* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
But preserve OLDDECL's DECL_UID. */
DECL_UID (olddecl) = olddecl_uid;
}
- /* 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) == VAR_DECL
&& TREE_STATIC (olddecl))))
make_decl_rtl (olddecl, NULL);
-
- return 1;
}
-/* Return any external DECL associated with ID, whether or not it is
- currently in scope. */
-
-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);
+/* 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.
- 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 shadows an existing declaration. */
static void
-warn_if_shadowing (tree x, tree old)
+warn_if_shadowing (tree new)
{
- 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_SOURCE_LINE (new) == 0
/* No shadow warnings for vars made for inlining. */
- || DECL_FROM_INLINE (x)
+ || DECL_FROM_INLINE (new)
/* 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->outer->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) == PARM_DECL && current_scope->outer->parm_flag))
return;
- name = IDENTIFIER_POINTER (DECL_NAME (x));
+ /* Is anything being shadowed? Do not be confused by a second binding
+ to the same decl in the externals scope. */
+ for (b = I_SYMBOL_BINDING (DECL_NAME (new)); b; b = b->shadowed)
+ if (b->decl && b->decl != new && b->contour != external_scope)
+ {
+ tree old = b->decl;
+
+ if (TREE_CODE (old) == PARM_DECL)
+ warning ("%Jdeclaration of '%D' shadows a parameter", new, new);
+ else if (DECL_FILE_SCOPE_P (old))
+ warning ("%Jdeclaration of '%D' shadows a global declaration",
+ new, new);
+ else if (TREE_CODE (old) == FUNCTION_DECL && DECL_BUILT_IN (old))
+ warning ("%Jdeclaration of '%D' shadows a built-in function",
+ new, new);
+ else
+ warning ("%Jdeclaration of '%D' shadows a previous local", new, new);
- 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) != FUNCTION_DECL || !DECL_BUILT_IN (old))
+ warning ("%Jshadowed declaration is here", old);
+
+ break;
+ }
}
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;
/* Functions need the lang_decl data. */
if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
DECL_LANG_SPECIFIC (x) = 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
+ /* 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);
+ 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->contour == scope)
+ {
+ 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)
+ {
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));
- 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->contour != external_scope)
+ b = b->shadowed;
+
+ /* 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
+ && (DECL_EXTERNAL (x) || TREE_PUBLIC (x)
+ || same_translation_unit_p (x, b->decl))
+ && duplicate_decls (x, b->decl))
{
- /* 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 (duplicate_decls (x, ext, scope != global_binding_level,
- false))
- x = copy_node (ext);
- }
- else
- record_external_decl (x);
+ bind (name, b->decl, scope);
+ return b->decl;
}
-
- 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)
+ else if (DECL_EXTERNAL (x) || TREE_PUBLIC (x))
{
- warn_if_shadowing (x, IDENTIFIER_SYMBOL_VALUE (name));
- scope->shadowed = tree_cons (name, IDENTIFIER_SYMBOL_VALUE (name),
- scope->shadowed);
+ C_DECL_IN_EXTERNAL_SCOPE (x) = 1;
+ bind (name, x, external_scope);
}
+ }
- /* Install the new declaration in the requested binding level. */
- IDENTIFIER_SYMBOL_VALUE (name) = x;
- C_DECL_INVISIBLE (x) = 0;
+ warn_if_shadowing (x);
- /* 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)))
- {
- 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);
- }
- }
+ skip_external_and_shadow_checks:
+ if (TREE_CODE (x) == TYPE_DECL)
+ clone_underlying_type (x);
- /* Put decls on list in reverse order.
- We will reverse them later if necessary. */
- TREE_CHAIN (x) = scope->names;
- scope->names = x;
+ bind (name, x, scope);
+ /* 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;
if (TREE_CODE (x) != VAR_DECL)
abort ();
name = DECL_NAME (x);
- old = IDENTIFIER_SYMBOL_VALUE (name);
-
- if (old)
- {
- if (DECL_CONTEXT (old))
- abort ();
- if (!duplicate_decls (x, old, 0, false))
- abort ();
+ if (I_SYMBOL_BINDING (name))
+ abort ();
- return old;
+ if (DECL_EXTERNAL (x) || TREE_PUBLIC (x))
+ {
+ C_DECL_IN_EXTERNAL_SCOPE (x) = 1;
+ bind (name, x, external_scope);
}
+ if (file_scope)
+ bind (name, x, file_scope);
- 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 = current_function_level;
-
- 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: abort ();
}
- IDENTIFIER_SYMBOL_VALUE (name) = x;
+ diag (N_("implicit declaration of function '%E'"), 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);
+ tree decl = lookup_name_in_scope (functionid, external_scope);
- 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_SOURCE_LINE (decl) == 0)
+ {
+ bind (functionid, decl, file_scope);
+ return decl;
+ }
+ else
{
- implicit_decl_warning (DECL_NAME (decl));
- if (! C_DECL_FILE_SCOPE (decl))
- warning ("%Hprevious declaration of '%D'",
- &DECL_SOURCE_LOCATION (decl), decl);
- C_DECL_IMPLICIT (decl) = 1;
+ /* 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))
+ {
+ implicit_decl_warning (functionid, decl);
+ C_DECL_IMPLICIT (decl) = 1;
+ }
+ bind (functionid, decl, current_scope);
+ 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);
- /* 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). */
-
+ /* 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 ("'%E' undeclared here (not in a function)", id);
+ scope = current_scope;
}
else
{
- error ("`%s' undeclared (first use in this function)",
- IDENTIFIER_POINTER (id));
+ error ("'%E' undeclared (first use in this function)", id);
if (! already)
{
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);
}
\f
/* Subroutine of lookup_label, declare_label, define_label: construct a
return label;
}
-/* Another subroutine of lookup_label, declare_label, define_label:
- set up the binding of name to LABEL_DECL in the given SCOPE. */
-
-static void
-bind_label (tree name, tree label, struct binding_level *scope)
-{
- if (IDENTIFIER_LABEL_VALUE (name))
- scope->shadowed = tree_cons (name, IDENTIFIER_LABEL_VALUE (name),
- scope->shadowed);
- IDENTIFIER_LABEL_VALUE (name) = label;
-
- TREE_CHAIN (label) = scope->names;
- scope->names = label;
-}
-
/* Get the LABEL_DECL corresponding to identifier NAME as a label.
Create one if none exists so far for the current function.
This is called when a label is used in a goto expression or
/* 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 = IDENTIFIER_LABEL_VALUE (name);
+ label = I_LABEL_DECL (name);
if (label && (DECL_CONTEXT (label) == current_function_decl
|| C_DECLARED_LABEL_FLAG (label)))
{
/* No label binding for that identifier; make one. */
label = make_label (name, input_location);
- /* Ordinary labels go in the current function scope, which is
- not necessarily the current label scope. */
- bind_label (name, label, current_function_level);
+ /* Ordinary labels go in the current function scope. */
+ bind (name, label, current_function_scope);
return label;
}
any that may be inherited from containing functions or containing
scopes. This is called for __label__ declarations. */
-/* Note that valid use, if the label being shadowed comes from another
- scope in the same function, requires calling declare_nonlocal_label
- right away. (Is this still true? -zw 2003-07-17) */
-
tree
declare_label (tree name)
{
- tree label = IDENTIFIER_LABEL_VALUE (name);
- tree dup;
+ struct c_binding *b = I_LABEL_BINDING (name);
+ tree label;
/* Check to make sure that the label hasn't already been declared
at this scope */
- for (dup = current_binding_level->names; dup; dup = TREE_CHAIN (dup))
- if (dup == label)
- {
- error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name));
- error ("%Hthis is a previous declaration",
- &DECL_SOURCE_LOCATION (dup));
+ if (b && b->contour == current_scope)
+ {
+ error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name));
+ locate_old_decl (b->decl, error);
- /* Just use the previous declaration. */
- return dup;
- }
+ /* Just use the previous declaration. */
+ return b->decl;
+ }
label = make_label (name, input_location);
C_DECLARED_LABEL_FLAG (label) = 1;
/* Declared labels go in the current scope. */
- bind_label (name, label, current_binding_level);
+ bind (name, label, current_scope);
return label;
}
tree
define_label (location_t location, tree name)
{
- tree label;
-
/* 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. */
- label = IDENTIFIER_LABEL_VALUE (name);
+ tree label = I_LABEL_DECL (name);
if (label
&& ((DECL_CONTEXT (label) == current_function_decl
&& C_DECLARED_LABEL_FLAG (label))))
{
error ("%Hduplicate label `%D'", &location, label);
- if (DECL_INITIAL (label))
- error ("%H`%D' previously defined here",
- &DECL_SOURCE_LOCATION (label), label);
- else
- error ("%H`%D' previously declared here",
- &DECL_SOURCE_LOCATION (label), label);
+ locate_old_decl (label, error);
return 0;
}
else if (label && DECL_CONTEXT (label) == current_function_decl)
/* No label binding for that identifier; make one. */
label = make_label (name, location);
- /* Ordinary labels go in the current function scope, which is
- not necessarily the current label scope. */
- bind_label (name, label, current_function_level);
+ /* Ordinary labels go in the current function scope. */
+ bind (name, label, current_function_scope);
}
if (warn_traditional && !in_system_header && lookup_name (name))
return label;
}
\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;
-}
-
-/* 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;
-}
-
-/* Similarly, store the list of tags of the current level. */
-
-static void
-storetags (tree tags)
-{
- current_binding_level->tags = tags;
-}
-\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 (thislevel_only || TREE_CODE (b->decl) != code)
{
- if (current_binding_level == global_binding_level
- || purpose_member (name, current_binding_level->tags))
+ /* 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->contour == current_scope
+ || (current_scope == file_scope && b->contour == external_scope))
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
}
\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->contour != external_scope || TREE_CODE (b->decl) == TYPE_DECL))
+ 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->contour == 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;
- current_binding_level = NULL_BINDING_LEVEL;
- free_binding_level = NULL_BINDING_LEVEL;
+ current_function_decl = 0;
+
+ /* 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>";
input_location.line = 0;
- /* 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);
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);
+ }
finish_decl (decl, init, NULL_TREE);
enum built_in_class class, 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_alloc_cleared (sizeof (struct lang_decl));
+ DECL_BUILT_IN_CLASS (decl) = class;
+ 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. */
+ if (I_SYMBOL_BINDING (id))
+ abort ();
+
+ C_DECL_IN_EXTERNAL_SCOPE (decl) = 1;
+ bind (id, decl, external_scope);
+
+ /* 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
split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
- typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
+ typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0,
+ NULL);
/* Apply attributes. */
decl_attributes (&typename, attrs, 0);
return typename;
return grokdeclarator (TREE_VALUE (typename),
TREE_PURPOSE (typename),
- PARM, 0);
+ PARM, 0, NULL);
}
/* Decode a declarator in an ordinary declaration or data definition.
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 ("%H'%D' is usually a function",
- &DECL_SOURCE_LOCATION (decl), decl);
+ warning ("%J'%D' 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 '%D' 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 '%D' 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 '%D' 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 '%D' 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 '%D' have incomplete type", decl);
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)))
+ {
+ tree ce = declarator;
+
+ if (TREE_CODE (ce) == INDIRECT_REF)
+ ce = TREE_OPERAND (declarator, 0);
+ if (TREE_CODE (ce) == CALL_EXPR)
+ {
+ tree args = TREE_PURPOSE (TREE_OPERAND (ce, 1));
+ 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;
+ }
+ }
+ }
if (TREE_CODE (decl) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl)
&& DECL_UNINLINABLE (decl)
&& lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
- warning ("%Hinline function '%D' given attribute noinline",
- &DECL_SOURCE_LOCATION (decl), decl);
+ warning ("%Jinline function '%D' 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 (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);
- }
-
return tem;
}
const char *asmspec = 0;
/* If a name was specified, get the string. */
- if (current_binding_level == global_binding_level)
+ if (current_scope == file_scope)
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 ("%Hinitializer fails to determine size of '%D'",
- &DECL_SOURCE_LOCATION (decl), decl);
+ error ("%Jinitializer fails to determine size of '%D'", decl, decl);
else if (failure == 2)
{
if (do_default)
- error ("%Harray size missing in '%D'",
- &DECL_SOURCE_LOCATION (decl), decl);
+ error ("%Jarray size missing in '%D'", decl, decl);
/* If a `static' var's size isn't known,
make it extern as well as static, so it does not get
allocated.
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 ("%Hzero or negative size array '%D'",
- &DECL_SOURCE_LOCATION (decl), decl);
+ error ("%Jzero or negative size array '%D'", decl, decl);
layout_decl (decl, 0);
}
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))
+ || !DECL_FILE_SCOPE_P (decl))
:
/* An automatic variable with an incomplete type
is an error. */
!DECL_EXTERNAL (decl)))
{
- error ("%Hstorage size of '%D' isn't known",
- &DECL_SOURCE_LOCATION (decl), decl);
+ error ("%Jstorage size of '%D' isn't known", decl, decl);
TREE_TYPE (decl) = error_mark_node;
}
if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
constant_expression_warning (DECL_SIZE (decl));
else
- error ("%Hstorage size of '%D' isn't constant",
- &DECL_SOURCE_LOCATION (decl), decl);
+ error ("%Jstorage size of '%D' isn't constant", decl, decl);
}
if (TREE_USED (type))
{
tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
SET_DECL_RTL (builtin, NULL_RTX);
- SET_DECL_ASSEMBLER_NAME (builtin, get_identifier (starred));
+ change_decl_assembler_name (builtin, get_identifier (starred));
#ifdef TARGET_MEM_FUNCTIONS
if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
init_block_move_fn (starred);
#endif
}
SET_DECL_RTL (decl, NULL_RTX);
- SET_DECL_ASSEMBLER_NAME (decl, get_identifier (starred));
+ change_decl_assembler_name (decl, get_identifier (starred));
}
+ /* If #pragma weak was used, mark the decl weak now. */
+ if (current_scope == file_scope)
+ maybe_apply_pragma_weak (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 (DECL_FILE_SCOPE_P (decl))
{
if (DECL_INITIAL (decl) == NULL_TREE
|| DECL_INITIAL (decl) == error_mark_node)
/* 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 (C_DECL_REGISTER (decl))
+ {
+ 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 this is not a static variable, issue a warning.
It doesn't make any sense to give an ASMSPEC for an
GCC has accepted -- but ignored -- the ASMSPEC in
this case. */
if (TREE_CODE (decl) == VAR_DECL
- && !DECL_REGISTER (decl)
+ && !C_DECL_REGISTER (decl)
&& !TREE_STATIC (decl))
- warning ("%Hignoring asm-specifier for non-static local "
- "variable '%D'", &DECL_SOURCE_LOCATION (decl), decl);
+ warning ("%Jignoring asm-specifier for non-static local "
+ "variable '%D'", decl, decl);
else
- SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
+ change_decl_assembler_name (decl, get_identifier (asmspec));
}
if (TREE_CODE (decl) != FUNCTION_DECL)
add_decl_stmt (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 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)))
+ add_decl_stmt (decl);
+
+ rest_of_decl_compilation (decl, NULL, 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. */
}
}
-/* 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
+ and push that on the current scope. */
void
push_parm_decl (tree parm)
{
tree decl;
- int old_immediate_size_expand = immediate_size_expand;
- /* Don't try computing parm sizes now -- wait till fn is called. */
+
+ /* Don't attempt to expand sizes while parsing this decl.
+ (We can get here with i_s_e 1 somehow from Objective-C.) */
+ int save_immediate_size_expand = immediate_size_expand;
immediate_size_expand = 0;
decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
- TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
+ TREE_PURPOSE (TREE_PURPOSE (parm)),
+ PARM, 0, NULL);
decl_attributes (&decl, TREE_VALUE (parm), 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);
+
+ immediate_size_expand = save_immediate_size_expand;
}
-/* 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;
tree stmt;
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))
}
}
\f
+/* 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>");
+
+ /* Necessary? */
+ STRIP_NOPS (*width);
+
+ /* Detect and ignore out of range field width and process valid
+ field widths. */
+ if (TREE_CODE (*width) != INTEGER_CST)
+ {
+ error ("bit-field `%s' 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 `%s'", name);
+ *width = integer_one_node;
+ }
+ else if (integer_zerop (*width) && orig_name)
+ {
+ error ("zero width for bit-field `%s'", 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 `%s' 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 `%s' 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 `%s' exceeds its type", name);
+ w = max_width;
+ *width = build_int_2 (w, 0);
+ }
+ 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 ("`%s' 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.
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.
+ 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
static tree
grokdeclarator (tree declarator, tree declspecs,
- enum decl_context decl_context, int initialized)
+ enum decl_context decl_context, int initialized, tree *width)
{
int specbits = 0;
tree spec;
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;
int size_varies = 0;
tree decl_attr = NULL_TREE;
tree array_ptr_quals = 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;
+ tree arg_info = NULL_TREE;
if (decl_context == FUNCDEF)
funcdef_flag = 1, decl_context = NORMAL;
default:
abort ();
}
+ orig_name = name;
if (name == 0)
name = "type name";
}
if (funcdef_flag && innermost_code != CALL_EXPR)
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.
{
if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
{
- if (!flag_isoc99)
+ if (pedantic && !flag_isoc99)
pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
}
else
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)
+ if (!t || TREE_CODE (t) != TYPE_DECL)
error ("`%s' fails to be a typedef or built in type",
IDENTIFIER_POINTER (id));
+ else if (TREE_TYPE (t) == error_mark_node)
+ ;
else
{
type = TREE_TYPE (t);
}
/* Decide whether an integer type is signed or not.
- Optionally treat bitfields as signed by default. */
+ Optionally treat bit-fields as signed by default. */
if (specbits & 1 << (int) RID_UNSIGNED
|| (bitfield && ! flag_signed_bitfields
&& (explicit_int || defaulted_int || explicit_char
}
}
+ /* Check the type and width of a bit-field. */
+ if (bitfield)
+ check_bitfield_type_and_width (&type, width, orig_name);
+
/* 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);
+ 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 = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (element_type);
+ restrictp
+ = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (element_type);
+ volatilep
+ = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (element_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 (pedantic && !flag_isoc99)
+ {
+ 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)
| (1 << (int) RID_THREAD))))
{
if (specbits & 1 << (int) RID_AUTO
- && (pedantic || current_binding_level == global_binding_level))
+ && (pedantic || current_scope == file_scope))
pedwarn ("function definition declared `auto'");
if (specbits & 1 << (int) RID_REGISTER)
error ("function definition declared `register'");
}
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)
+ /* `extern' with initialization is invalid if not at file scope. */
+ if (current_scope == file_scope)
warning ("`%s' initialized and declared `extern'", name);
else
error ("`%s' has both `extern' and initializer", name);
}
- else if (current_binding_level == global_binding_level)
+ else if (current_scope == file_scope)
{
if (specbits & 1 << (int) RID_AUTO)
- error ("top-level declaration of `%s' specifies `auto'", name);
+ error ("file-scope declaration of `%s' specifies `auto'", name);
}
else
{
type = error_mark_node;
}
- if (pedantic && flexible_array_type_p (type))
+ 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_SIZE (type) = bitsize_zero_node;
TYPE_SIZE_UNIT (type) = size_zero_node;
}
+ else if (declarator && TREE_CODE (declarator) == INDIRECT_REF)
+ /* We can never complete an array type which is the target of a
+ pointer, so go ahead and lay it out. */
+ layout_type (type);
+
if (decl_context != PARM
&& (array_ptr_quals != NULL_TREE || array_parm_static))
{
}
else if (TREE_CODE (declarator) == CALL_EXPR)
{
+ /* Say it's a definition only for the CALL_EXPR closest to
+ the identifier. */
+ bool really_funcdef = (funcdef_flag
+ && (TREE_CODE (TREE_OPERAND (declarator, 0))
+ == IDENTIFIER_NODE));
tree arg_types;
/* Declaring a function type.
/* Construct the function type and go to the next
inner layer of declarator. */
+ arg_info = TREE_OPERAND (declarator, 1);
+ arg_types = grokparms (arg_info, really_funcdef);
- 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)
{
tree link;
- for (link = last_function_parm_tags;
+ for (link = ARG_INFO_TAGS (arg_info);
link;
link = TREE_CHAIN (link))
TYPE_CONTEXT (TREE_VALUE (link)) = type;
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'");
+ if (pedantic && !flag_isoc99)
+ {
+ if (constp > 1)
+ pedwarn ("duplicate `const'");
+ if (volatilep > 1)
+ pedwarn ("duplicate `volatile'");
+ if (restrictp > 1)
+ pedwarn ("duplicate `restrict'");
+ }
type_quals = ((constp ? TYPE_QUAL_CONST : 0)
| (restrictp ? TYPE_QUAL_RESTRICT : 0)
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
+ || (current_scope == file_scope
&& !(specbits
& ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
{
}
/* 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));
- }
+ type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
+ type_quals),
+ TYPE_DOMAIN (type));
decl = build_decl (FIELD_DECL, declarator, type);
DECL_NONADDRESSABLE_P (decl) = bitfield;
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);
+ || current_scope == file_scope);
if (specbits & (1 << (int) RID_AUTO)
- && (pedantic || current_binding_level == global_binding_level))
+ && (pedantic || current_scope == file_scope))
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.
+ /* Function declaration not at file scope.
Storage classes other than `extern' are not allowed
and `extern' makes no difference. */
- if (current_binding_level != global_binding_level
+ if (current_scope != file_scope
&& (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
&& pedantic)
pedwarn ("invalid storage class for function `%s'", name);
TREE_PUBLIC (decl)
= !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
+ /* For a function definition, record the argument information
+ block in DECL_ARGUMENTS where store_parm_decls will look
+ for it. */
+ if (funcdef_flag)
+ DECL_ARGUMENTS (decl) = arg_info;
+
if (defaulted_int)
C_FUNCTION_IMPLICIT_INT (decl) = 1;
}
else if (inlinep)
{
- /* 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
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
{
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);
+ tree visible_decl = lookup_name (declarator);
- 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);
C_DECL_VARIABLE_SIZE (decl) = 1;
if (inlinep)
- pedwarn ("%Hvariable '%D' declared `inline'",
- &DECL_SOURCE_LOCATION (decl), decl);
+ pedwarn ("%Jvariable '%D' declared `inline'", decl, decl);
DECL_EXTERNAL (decl) = extern_ref;
- /* 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_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;
and in case doing stupid register allocation. */
if (specbits & (1 << (int) RID_REGISTER))
- DECL_REGISTER (decl) = 1;
+ {
+ 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;
+ }
+
+#ifdef ENABLE_CHECKING
+ /* 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. */
+ if (DECL_ASSEMBLER_NAME_SET_P (decl))
+ abort ();
+#endif
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
when FUNCDEF_FLAG is zero. */
static tree
-grokparms (tree parms_info, int funcdef_flag)
+grokparms (tree arg_info, int funcdef_flag)
{
- tree first_parm = TREE_CHAIN (parms_info);
+ tree arg_types = ARG_INFO_TYPES (arg_info);
- last_function_parms = TREE_PURPOSE (parms_info);
- last_function_parm_tags = TREE_VALUE (parms_info);
-
- 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");
- 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)
pedwarn ("parameter names (without types) in function declaration");
- last_function_parms = first_parm;
+ ARG_INFO_PARMS (arg_info) = ARG_INFO_TYPES (arg_info);
+ ARG_INFO_TYPES (arg_info) = 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 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 = ARG_INFO_PARMS (arg_info), 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;
+
+ if (!COMPLETE_TYPE_P (type))
+ {
+ if (funcdef_flag)
+ {
+ if (DECL_NAME (parm))
+ error ("%Jparameter %u ('%D') has incomplete type",
+ parm, parmno, parm);
+ else
+ error ("%Jparameter %u has incomplete type",
+ parm, parmno);
- return first_parm;
+ TREE_VALUE (typelt) = error_mark_node;
+ TREE_TYPE (parm) = error_mark_node;
+ }
+ else
+ {
+ if (DECL_NAME (parm))
+ warning ("%Jparameter %u ('%D') has incomplete type",
+ parm, parmno, parm);
+ else
+ warning ("%Jparameter %u has incomplete 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 tree_list node with info
+ on a parameter list just parsed. This tree_list node should be
+ examined using the ARG_INFO_* macros, defined above:
+
+ ARG_INFO_PARMS: a list of parameter decls.
+ ARG_INFO_TAGS: a list of structure, union and enum tags defined.
+ ARG_INFO_TYPES: a list of argument types to go in the FUNCTION_TYPE.
+ ARG_INFO_OTHERS: a list of non-parameter decls (notably enumeration
+ constants) defined with the parameters.
+
+ This tree_list node is later fed to 'grokparms' and 'store_parm_decls'.
- 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'. */
+ 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. */
tree
-get_parm_info (int void_at_end)
+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 ("%Hparameter '%D' has just a forward declaration",
- &DECL_SOURCE_LOCATION (decl), decl);
- TREE_CHAIN (decl) = new_parms;
- new_parms = decl;
- }
- decl = next;
- }
+ struct c_binding *b = current_scope->bindings;
+ tree arg_info = make_node (TREE_LIST);
+ 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;
+
+ /* 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. */
+#ifdef ENABLE_CHECKING
+ if (b == 0)
+ abort ();
+#endif
- /* Put the parm decls back in the order they were in in the parm list. */
- for (t = order; t; t = TREE_CHAIN (t))
+ /* 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_CHAIN (t))
- TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
- else
- TREE_CHAIN (TREE_VALUE (t)) = 0;
+ 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 (arg_info) = void_list_node;
+ return arg_info;
}
- new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
- new_parms);
+ 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)
+ {
+ tree decl = b->decl;
+ tree type = TREE_TYPE (decl);
+ const char *keyword;
- /* 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);
+ switch (TREE_CODE (decl))
+ {
+ case PARM_DECL:
+ if (b->id)
+ {
+#ifdef ENABLE_CHECKING
+ if (I_SYMBOL_BINDING (b->id) != b) abort ();
+#endif
+ I_SYMBOL_BINDING (b->id) = b->shadowed;
+ }
- 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;
- }
- }
+ /* Check for forward decls that never got their actual decl. */
+ if (TREE_ASM_WRITTEN (decl))
+ error ("%Jparameter '%D' 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;
- if (void_at_end)
- return tree_cons (new_parms, tags,
- nreverse (tree_cons (NULL_TREE, void_type_node, types)));
+ 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)
+ {
+#ifdef ENABLE_CHECKING
+ if (I_TAG_BINDING (b->id) != b) abort ();
+#endif
+ I_TAG_BINDING (b->id) = b->shadowed;
+ }
- return tree_cons (new_parms, tags, nreverse (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);
-/* At end of parameter list, warn about any struct, union or enum tags
- defined within. Do so because these types cannot ever become complete. */
+ if (! explained_incomplete_types)
+ {
+ warning ("its scope is only this definition or declaration,"
+ " which is probably not what you want");
+ explained_incomplete_types = true;
+ }
+ }
-void
-parmlist_tags_warning (void)
-{
- tree elt;
- static int already;
+ tags = tree_cons (b->id, decl, tags);
+ 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;
+ 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)
+ {
+#ifdef ENABLE_CHECKING
+ if (I_SYMBOL_BINDING (b->id) != b) abort ();
+#endif
+ I_SYMBOL_BINDING (b->id) = b->shadowed;
+ }
+ break;
+
+ /* Other things that might be encountered. */
+ case LABEL_DECL:
+ case FUNCTION_DECL:
+ case VAR_DECL:
+ default:
+ abort ();
}
+
+ b = free_binding_and_advance (b);
}
+
+ ARG_INFO_PARMS (arg_info) = parms;
+ ARG_INFO_TAGS (arg_info) = tags;
+ ARG_INFO_TYPES (arg_info) = types;
+ ARG_INFO_OTHERS (arg_info) = 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;
/* Process the specs, declarator (NULL if omitted) 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
}
}
- value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
+ value = grokdeclarator (declarator, declspecs, FIELD, 0,
+ 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 ("%Hduplicate member '%D'",
- &DECL_SOURCE_LOCATION (x), x);
+ error ("%Jduplicate member '%D'", x, x);
DECL_NAME (x) = NULL_TREE;
}
}
slot = htab_find_slot (htab, y, INSERT);
if (*slot)
{
- error ("%Hduplicate member '%D'",
- &DECL_SOURCE_LOCATION (x), x);
+ error ("%Jduplicate member '%D'", 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))
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 ("%Hbit-field '%D' width not an integer constant",
- &DECL_SOURCE_LOCATION (x), x);
- 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 ("%Hbit-field '%D' has invalid type",
- &DECL_SOURCE_LOCATION (x), x);
- 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 ("%Hbit-field '%D' type invalid in ISO C",
- &DECL_SOURCE_LOCATION (x), x);
-
- /* 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 ("%Hnegative width in bit-field '%D'",
- &DECL_SOURCE_LOCATION (x), x);
- else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
- pedwarn ("%Hwidth of '%D' exceeds its type",
- &DECL_SOURCE_LOCATION (x), x);
- else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
- error ("%Hzero width for bit-field '%D'",
- &DECL_SOURCE_LOCATION (x), x);
- 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 ("%H'%D' is narrower than values of its type",
- &DECL_SOURCE_LOCATION (x), x);
-
- 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;
&& TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
{
if (TREE_CODE (t) == UNION_TYPE)
- error ("%Hflexible array member in union",
- &DECL_SOURCE_LOCATION (x));
+ {
+ error ("%Jflexible array member in union", x);
+ TREE_TYPE (x) = error_mark_node;
+ }
else if (TREE_CHAIN (x) != NULL_TREE)
- error ("%Hflexible array member not at end of struct",
- &DECL_SOURCE_LOCATION (x));
+ {
+ error ("%Jflexible array member not at end of struct", x);
+ TREE_TYPE (x) = error_mark_node;
+ }
else if (! saw_named_field)
- error ("%Hflexible array member in otherwise empty struct",
- &DECL_SOURCE_LOCATION (x));
+ {
+ 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 ("%Hinvalid use of structure with flexible array member",
- &DECL_SOURCE_LOCATION (x));
+ 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 */
+ /* Delete all zero-width bit-fields from the fieldlist. */
{
tree *fieldlistp = &fieldlist;
while (*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));
+
+ space = ggc_alloc_cleared (sizeof (struct lang_type));
space2 = ggc_alloc (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);
/* 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)
+ for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
+ x;
+ x = TREE_CHAIN (x))
{
- 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);
- }
- }
+ 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, NULL, 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);
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);
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);
-
- if (precision == TYPE_PRECISION (integer_type_node))
- enum_value_type = c_common_type_for_size (precision, 0);
- else
- enum_value_type = enumtype;
+ tem = unsign ? unsigned_type_node : integer_type_node;
- TYPE_MIN_VALUE (enumtype) = minnode;
- TYPE_MAX_VALUE (enumtype) = maxnode;
- TYPE_PRECISION (enumtype) = precision;
- TREE_UNSIGNED (enumtype) = unsign;
+ TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
+ TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
+ TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
+ TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
TYPE_SIZE (enumtype) = 0;
layout_type (enumtype);
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_alloc_cleared (sizeof (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 '%E' 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);
}
}
if (pedantic && ! int_fits_type_p (value, integer_type_node))
{
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);
current_function_returns_abnormally = 0;
warn_about_return_type = 0;
current_extern_inline = 0;
+ c_in_iteration_stmt = 0;
+ c_in_case_stmt = 0;
/* Don't expand any sizes in the return type of the function. */
immediate_size_expand = 0;
- decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
+ decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, NULL);
/* If the declarator is not suitable for a function definition,
cause a syntax error. */
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 ("%Hinline function '%D' given attribute noinline",
- &DECL_SOURCE_LOCATION (decl1), decl1);
+ warning ("%Jinline function '%D' 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;
-
/* 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)))
&& TREE_PUBLIC (decl1)
&& ! MAIN_NAME_P (DECL_NAME (decl1))
&& C_DECL_ISNT_PROTOTYPE (old_decl))
- warning ("%Hno previous prototype for '%D'",
- &DECL_SOURCE_LOCATION (decl1), decl1);
+ warning ("%Jno previous prototype for '%D'", 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 ("%H'%D' was used with no prototype before its definition",
- &DECL_SOURCE_LOCATION (decl1), decl1);
+ warning ("%J'%D' 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 ("%Hno previous declaration for '%D'",
- &DECL_SOURCE_LOCATION (decl1), decl1);
+ warning ("%Jno previous declaration for '%D'", 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 ("%H`%D' was used with no declaration before its definition",
- &DECL_SOURCE_LOCATION (decl1), decl1);
+ warning ("%J`%D' 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;
+#ifdef ENABLE_CHECKING
+ /* 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. */
+ if (DECL_ASSEMBLER_NAME_SET_P (decl1))
+ abort ();
+#endif
+
+ /* 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)))
{
tree args;
int argct = 0;
- const location_t *locus = &DECL_SOURCE_LOCATION (decl1);
if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
!= integer_type_node)
- pedwarn ("%Hreturn type of '%D' is not `int'", locus, decl1);
+ pedwarn ("%Jreturn type of '%D' 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 ("%Hfirst argument of '%D' should be `int'",
- locus, decl1);
+ pedwarn ("%Jfirst argument of '%D' 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 ("%Hsecond argument of '%D' should be 'char **'",
- locus, decl1);
+ pedwarn ("%Jsecond argument of '%D' 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 ("%Hthird argument of '%D' should probably be "
- "'char **'", locus, decl1);
+ pedwarn ("%Jthird argument of '%D' 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 ("%H'%D' takes only zero or two arguments", locus, decl1);
+ pedwarn ("%J'%D' takes only zero or two arguments", decl1, decl1);
if (! TREE_PUBLIC (decl1))
- pedwarn ("%H'%D' is normally a non-static function", locus, decl1);
+ pedwarn ("%J'%D' 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);
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;
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, tree 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;
-
- /* This is a chain of PARM_DECLs from old-style parm declarations. */
- tree parmdecls = getdecls ();
-
- /* 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;
-
- /* The function containing FNDECL, if any. */
- tree context = decl_function_context (fndecl);
+ tree decl;
+ tree parms = ARG_INFO_PARMS (arg_info);
+ tree tags = ARG_INFO_TAGS (arg_info);
+ tree others = ARG_INFO_OTHERS (arg_info);
- /* Nonzero if this definition is written with a prototype. */
- int prototype = 0;
+ if (current_scope->bindings)
+ {
+ error ("%Jold-style parameter declarations in prototyped "
+ "function definition", fndecl);
- bool saved_warn_shadow = warn_shadow;
+ /* 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 (arg_info) != 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 = parms; decl; decl = TREE_CHAIN (decl))
+ {
+ DECL_CONTEXT (decl) = current_function_decl;
+ if (DECL_NAME (decl))
+ bind (DECL_NAME (decl), decl, current_scope);
+ else
+ error ("%Jparameter name omitted", decl);
+ }
- /* Don't re-emit shadow warnings. */
- warn_shadow = false;
+ /* Record the parameter list in the function declaration. */
+ DECL_ARGUMENTS (fndecl) = parms;
- if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
+ /* Now make all the ancillary declarations visible, likewise. */
+ for (decl = others; decl; decl = TREE_CHAIN (decl))
{
- /* 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. */
+ DECL_CONTEXT (decl) = current_function_decl;
+ if (DECL_NAME (decl))
+ bind (DECL_NAME (decl), decl, current_scope);
+ }
- tree next;
- tree others = 0;
+ /* And all the tag declarations. */
+ for (decl = tags; decl; decl = TREE_CHAIN (decl))
+ if (TREE_PURPOSE (decl))
+ bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope);
+}
- prototype = 1;
+/* Subroutine of store_parm_decls which handles old-style function
+ definitions (separate parameter list and declarations). */
- if (parmdecls != 0)
- {
- tree decl, link;
-
- error ("%Hparm types given both in parmlist and separately",
- &DECL_SOURCE_LOCATION (fndecl));
- /* 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;
- }
+static void
+store_parm_decls_oldstyle (tree fndecl, tree arg_info)
+{
+ struct c_binding *b;
+ tree parm, decl, last;
+ tree parmids = ARG_INFO_PARMS (arg_info);
- specparms = nreverse (specparms);
- for (parm = specparms; parm; parm = next)
- {
- const location_t *locus = &DECL_SOURCE_LOCATION (parm);
- next = TREE_CHAIN (parm);
- if (TREE_CODE (parm) == PARM_DECL)
- {
- if (DECL_NAME (parm) == 0)
- error ("%Hparameter name omitted", locus);
- else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
- && VOID_TYPE_P (TREE_TYPE (parm)))
- {
- error ("%Hparameter '%D' declared void", locus, parm);
- /* Change the type to error_mark_node so this parameter
- will be ignored by assign_parms. */
- TREE_TYPE (parm) = error_mark_node;
- }
- pushdecl (parm);
- }
- else
- {
- /* If we find an enum constant or a type tag,
- put it aside for the moment. */
- TREE_CHAIN (parm) = 0;
- others = chainon (others, parm);
- }
- }
+ /* 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)
+ if (TREE_CODE (b->decl) == PARM_DECL && DECL_WEAK (b->decl))
+ abort ();
+#endif
- /* Get the decls in their original chain order
- and record in the function. */
- DECL_ARGUMENTS (fndecl) = getdecls ();
+ if (warn_old_style_definition && !in_system_header)
+ warning ("%Jold-style function definition", fndecl);
- /* Now pushdecl the enum constants. */
- for (parm = others; parm; parm = next)
+ /* 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)
{
- 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);
+ error ("%Jparameter name missing from parameter list", fndecl);
+ TREE_PURPOSE (parm) = 0;
+ continue;
}
- storetags (chainon (parmtags, gettags ()));
- }
- 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.
-
- 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 (parm = specparms; parm; parm = TREE_CHAIN (parm))
+ b = I_SYMBOL_BINDING (TREE_VALUE (parm));
+ if (b && b->contour == current_scope)
{
- tree tail, found = NULL;
-
- if (TREE_VALUE (parm) == 0)
+ decl = b->decl;
+ /* If we got something other than a PARM_DECL it is an error. */
+ if (TREE_CODE (decl) != PARM_DECL)
+ error ("%J'%D' 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))
{
- error ("%Hparameter name missing from parameter list",
- &DECL_SOURCE_LOCATION (fndecl));
+ error ("%Jmultiple parameters named '%D'", decl, decl);
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))
+ /* If the declaration says "void", complain and turn it into
+ an int. */
+ else if (VOID_TYPE_P (TREE_TYPE (decl)))
{
- error ("%Hmultiple parameters named '%D'",
- &DECL_SOURCE_LOCATION (found), found);
- found = 0;
+ error ("%Jparameter '%D' declared with void type", decl, decl);
+ TREE_TYPE (decl) = integer_type_node;
+ DECL_ARG_TYPE (decl) = integer_type_node;
+ layout_decl (decl, 0);
}
+ }
+ /* If no declaration found, default to int. */
+ else
+ {
+ 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 the declaration says "void", complain and ignore it. */
- if (found && VOID_TYPE_P (TREE_TYPE (found)))
- {
- error ("%Hparameter '%D' declared void",
- &DECL_SOURCE_LOCATION (found), found);
- TREE_TYPE (found) = integer_type_node;
- DECL_ARG_TYPE (found) = integer_type_node;
- layout_decl (found, 0);
- }
+ if (flag_isoc99)
+ pedwarn ("%Jtype of '%D' defaults to 'int'", decl, decl);
+ else if (extra_warnings)
+ warning ("%Jtype of '%D' defaults to 'int'", decl, decl);
+ }
- /* 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 ("%Htype of '%D' defaults to `int'",
- &DECL_SOURCE_LOCATION (found), found);
- else if (extra_warnings)
- warning ("%Htype of '%D' defaults to `int'",
- &DECL_SOURCE_LOCATION (found), found);
- pushdecl (found);
- }
+ TREE_PURPOSE (parm) = decl;
+ DECL_WEAK (decl) = 1;
+ }
- TREE_PURPOSE (parm) = found;
+ /* Now examine the parms chain for incomplete declarations
+ and declarations with no corresponding names. */
- /* Mark this decl as "already found". */
- DECL_WEAK (found) = 1;
- }
+ for (b = current_scope->bindings; b; b = b->prev)
+ {
+ parm = b->decl;
+ if (TREE_CODE (parm) != PARM_DECL)
+ continue;
- /* 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. */
+ if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
+ {
+ error ("%Jparameter '%D' has incomplete type", parm, parm);
+ TREE_TYPE (parm) = error_mark_node;
+ }
- nonparms = 0;
- for (parm = parmdecls; parm;)
+ if (! DECL_WEAK (parm))
{
- const location_t *locus = &DECL_SOURCE_LOCATION (parm);
- tree next = TREE_CHAIN (parm);
- TREE_CHAIN (parm) = 0;
+ error ("%Jdeclaration for parameter '%D' 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 ("%Hparameter '%D' has incomplete type", locus, parm);
- 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 ("%Hdeclaration for parameter '%D' but no such "
- "parameter", locus, parm);
- /* 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 (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)
{
- /* 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
- {
- error ("argument `%s' doesn't match prototype",
- IDENTIFIER_POINTER (DECL_NAME (parm)));
- error ("%Hprototype declaration",
- ¤t_function_prototype_locus);
+ pedwarn ("promoted argument '%D' "
+ "doesn't match prototype", parm);
+ pedwarn ("%Hprototype declaration",
+ ¤t_function_prototype_locus);
}
}
+ else
+ {
+ error ("argument '%D' 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_type_copy (TREE_TYPE (fndecl));
- TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
- }
+ TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
+ }
+}
+
+/* A subroutine of store_parm_decls called via walk_tree. Mark all
+ decls non-local. */
- /* 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. */
+static tree
+set_decl_nonlocal (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED)
+{
+ tree t = *tp;
- storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
+ if (DECL_P (t))
+ {
+ DECL_NONLOCAL (t) = 1;
+ *walk_subtrees = 0;
}
+ else if (TYPE_P (t))
+ *walk_subtrees = 0;
+
+ return NULL;
+}
+
+/* Store the parameter declarations into the current function declaration.
+ This is called after parsing the parameter declarations, before
+ digesting the body of the function.
- /* 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. */
+ For an old-style definition, construct a prototype out of the old-style
+ parameter declarations and inject it into the function's type. */
- keep_next_if_subblocks = 1;
+void
+store_parm_decls (void)
+{
+ tree fndecl = current_function_decl;
+
+ /* The function containing FNDECL, if any. */
+ tree context = decl_function_context (fndecl);
+
+ /* The argument information block for FNDECL. */
+ tree arg_info = DECL_ARGUMENTS (fndecl);
+
+ /* 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. */
+ bool proto = ARG_INFO_TYPES (arg_info) != 0;
+
+ 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. */
+
+ 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));
+ begin_stmt_tree (&DECL_SAVED_TREE (fndecl));
/* If this is a nested function, save away the sizes of any
variable-size types so that we can expand them when generating
for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
t;
t = TREE_CHAIN (t))
- SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
+ {
+ /* We will have a nonlocal use of whatever variables are
+ buried inside here. */
+ walk_tree (&TREE_OPERAND (TREE_VALUE (t), 0),
+ set_decl_nonlocal, NULL, NULL);
+
+ SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
+ }
}
/* This function is being processed in whole-function mode. */
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
+/* Give FNDECL and all its nested functions to cgraph for compilation. */
+
+static void
+c_finalize (tree fndecl)
+{
+ struct cgraph_node *cgn;
+
+ /* Handle attribute((warn_unused_result)). Relies on gimple input. */
+ c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
+
+ /* ??? 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;
+ }
+
+ /* Finalize all nested functions now. */
+ cgn = cgraph_node (fndecl);
+ for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
+ c_finalize (cgn->decl);
+
+ cgraph_finalize_function (fndecl, false);
+}
+
/* 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)
+ bother calling push_scope/pop_scope, which means we get here with
+ the scope stack out of sync. Detect this situation by noticing
+ that current_scope is still as store_parm_decls left it, and do
+ a dummy push/pop to get back to consistency.
+ Note that the call to push_scope does not actually push another
+ scope - see there for details. */
+
+ if (current_scope->parm_flag && next_is_function_body)
+ {
+ push_scope ();
+ pop_scope ();
+ }
+
+ if (TREE_CODE (fndecl) == FUNCTION_DECL
+ && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
{
- pushlevel (0);
- poplevel (1, 0, 1);
+ 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 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 ("%Hreturn type of '%D' is not `int'",
- &DECL_SOURCE_LOCATION (fndecl), fndecl);
+ pedwarn ("%Jreturn type of '%D' is not `int'", fndecl, fndecl);
}
else
{
&& 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 ();
- }
-
- /* 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;
-
- /* 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;
-
- /* 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 ();
-
/* With just -Wextra, complain only if function returns both with
and without a value. */
if (extra_warnings
&& 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 (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))
- {
- const location_t *locus = &DECL_SOURCE_LOCATION (fndecl);
- unsigned int size_as_int
- = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
-
- if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
- warning ("%Hsize of return value of '%D' is %u bytes",
- locus, fndecl, size_as_int);
- else
- warning ("%Hsize of return value of '%D' is larger than %wd bytes",
- locus, fndecl, larger_than_size);
- }
- }
-
- if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
- && ! flag_inline_trees)
- {
- /* 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 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 (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);
- }
+ /* Genericize before inlining. Delay genericizing nested functions
+ until their parent function is genericized. Since finalizing
+ requires GENERIC, delay that as well. */
- if (DECL_STATIC_DESTRUCTOR (fndecl))
+ if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
{
- if (targetm.have_ctors_dtors)
- (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
- DEFAULT_INIT_PRIORITY);
+ if (!decl_function_context (fndecl))
+ {
+ c_genericize (fndecl);
+ lower_nested_functions (fndecl);
+ c_finalize (fndecl);
+ }
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, false);
+
+ 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))
- {
- const location_t *locus = &DECL_SOURCE_LOCATION (t);
- if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
- error ("%Hdeclaration of non-variable '%D' in 'for' loop "
- "initial declaration", locus, t);
- else if (TREE_STATIC (t))
- error ("%Hdeclaration of static variable '%D' in 'for' loop "
- "initial declaration", locus, t);
- else if (DECL_EXTERNAL (t))
- error ("%Hdeclaration of 'extern' variable '%D' in 'for' loop "
- "initial declaration", locus, t);
+ if (!id)
+ continue;
+
+ switch (TREE_CODE (decl))
+ {
+ case VAR_DECL:
+ if (TREE_STATIC (decl))
+ error ("%Jdeclaration of static variable '%D' in 'for' loop "
+ "initial declaration", decl, decl);
+ else if (DECL_EXTERNAL (decl))
+ error ("%Jdeclaration of 'extern' variable '%D' 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 '%D' 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;
- 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. */
p->base.x_stmt_tree = c_stmt_tree;
p->base.x_scope_stmt_stack = c_scope_stmt_stack;
+ p->x_in_iteration_stmt = c_in_iteration_stmt;
+ p->x_in_case_stmt = c_in_case_stmt;
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. */
{
struct language_function *p = f->language;
- 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;
+ c_in_iteration_stmt = p->x_in_iteration_stmt;
+ c_in_case_stmt = p->x_in_case_stmt;
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;
}
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->contour == file_scope || b->contour == external_scope)
+ return b->decl;
- /* Only local values for this decl. */
return 0;
}
return build1 (INDIRECT_REF, quals, itarget);
}
-/* Hash and equality functions for link_hash_table: key off
- DECL_ASSEMBLER_NAME. */
-
-static hashval_t
-link_hash_hash (const void *x_p)
-{
- tree x = (tree)x_p;
- return (hashval_t) (long)DECL_ASSEMBLER_NAME (x);
-}
+/* A wrapper around lhd_set_decl_assembler_name that gives static
+ variables their C names if they are at file scope and only one
+ translation unit is being compiled, for backwards compatibility
+ with certain bizarre assembler hacks (like crtstuff.c). */
-static int
-link_hash_eq (const void *x1_p, const void *x2_p)
+void
+c_static_assembler_name (tree decl)
{
- tree x1 = (tree)x1_p;
- tree x2 = (tree)x2_p;
- return DECL_ASSEMBLER_NAME (x1) == DECL_ASSEMBLER_NAME (x2);
+ if (num_in_fnames == 1
+ && !TREE_PUBLIC (decl) && DECL_CONTEXT (decl)
+ && TREE_CODE (DECL_CONTEXT (decl)) == TRANSLATION_UNIT_DECL)
+ SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
+ else
+ lhd_set_decl_assembler_name (decl);
}
-/* Propagate information between definitions and uses between multiple
- translation units in TU_LIST based on linkage rules. */
-
-void
-merge_translation_unit_decls (void)
+/* Perform final processing on file-scope data. */
+static void
+c_write_global_declarations_1 (tree globals)
{
- const tree tu_list = current_file_decl;
- tree tu;
+ size_t len = list_length (globals);
+ tree *vec = xmalloc (sizeof (tree) * len);
+ size_t i;
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;
- /* If only one translation unit seen, no copying necessary. */
- if (TREE_CHAIN (tu_list) == NULL_TREE)
- return;
-
- link_hash_table = htab_create (1021, link_hash_hash, link_hash_eq, NULL);
-
- /* 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))
- {
- 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)
- {
- 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))
- {
- DECL_INITIAL (decl) = NULL_TREE;
- DECL_COMMON (decl) = 0;
- DECL_ONE_ONLY (decl) = 0;
- DECL_WEAK (decl) = 0;
- }
- else if (DECL_EXTERNAL (old_decl))
- {
- DECL_INITIAL (old_decl) = NULL_TREE;
- DECL_COMMON (old_decl) = 0;
- DECL_ONE_ONLY (old_decl) = 0;
- DECL_WEAK (old_decl) = 0;
- *slot = decl;
- }
- else
- {
- error ("%Hredefinition of global '%D'",
- &DECL_SOURCE_LOCATION (decl), decl);
- error ("%H'%D' previously defined here",
- &DECL_SOURCE_LOCATION (old_decl), old_decl);
- }
- }
- else
- *slot = 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;
- /* 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))
- {
- tree global_decl;
- global_decl = 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);
- }
+ wrapup_global_declarations (vec, len);
+ check_global_declarations (vec, len);
- htab_delete (link_hash_table);
+ free (vec);
}
-/* Perform final processing on file-scope data. */
-
void
-c_write_global_declarations(void)
+c_write_global_declarations (void)
{
- tree link;
-
- for (link = current_file_decl; link; link = TREE_CHAIN (link))
- {
- tree globals = BLOCK_VARS (DECL_INITIAL (link));
- int len = list_length (globals);
- tree *vec = 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);
- }
-}
+ tree t;
-/* Reset the parser's state in preparation for a new file. */
+ /* We don't want to do this if generating a PCH. */
+ if (pch_file)
+ return;
-void
-c_reset_state (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));
+ /* Process all file scopes in this compilation. */
+ for (t = all_translation_units; t; t = TREE_CHAIN (t))
+ c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
+
+ /* Now do the same for the externals scope. */
+ t = pop_scope ();
+ if (t)
+ c_write_global_declarations_1 (BLOCK_VARS (t));
}
#include "gt-c-decl.h"
OSDN Git Service
