/* Handle #pragma, system V.4 style. Supports #pragma weak and #pragma pack.
- Copyright (C) 1992, 1997, 1998, 1999, 2000, 2001, 2002
- Free Software Foundation, Inc.
+ Copyright (C) 1992, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
+ 2006, 2007 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
#include "rtl.h"
#include "tree.h"
#include "function.h"
#include "flags.h"
#include "toplev.h"
#include "ggc.h"
-#include "c-lex.h"
#include "c-common.h"
#include "output.h"
#include "tm_p.h"
+#include "vec.h"
+#include "target.h"
+#include "diagnostic.h"
+#include "opts.h"
-#define GCC_BAD(msgid) do { warning (msgid); return; } while (0)
-#define GCC_BAD2(msgid, arg) do { warning (msgid, arg); return; } while (0)
+#define GCC_BAD(gmsgid) \
+ do { warning (OPT_Wpragmas, gmsgid); return; } while (0)
+#define GCC_BAD2(gmsgid, arg) \
+ do { warning (OPT_Wpragmas, gmsgid, arg); return; } while (0)
-#ifdef HANDLE_PRAGMA_PACK
-static void handle_pragma_pack PARAMS ((cpp_reader *));
-
-#ifdef HANDLE_PRAGMA_PACK_PUSH_POP
-typedef struct align_stack
+typedef struct align_stack GTY(())
{
- int alignment;
- unsigned int num_pushes;
- tree id;
+ int alignment;
+ tree id;
struct align_stack * prev;
} align_stack;
-static struct align_stack * alignment_stack = NULL;
+static GTY(()) struct align_stack * alignment_stack;
+
+#ifdef HANDLE_PRAGMA_PACK
+static void handle_pragma_pack (cpp_reader *);
+#ifdef HANDLE_PRAGMA_PACK_PUSH_POP
/* If we have a "global" #pragma pack(<n>) in effect when the first
- #pragma pack(push,<n>) is encountered, this stores the value of
- maximum_field_alignment in effect. When the final pop_alignment()
+ #pragma pack(push,<n>) is encountered, this stores the value of
+ maximum_field_alignment in effect. When the final pop_alignment()
happens, we restore the value to this, not to a value of 0 for
maximum_field_alignment. Value is in bits. */
static int default_alignment;
-#define SET_GLOBAL_ALIGNMENT(ALIGN) \
- (default_alignment = maximum_field_alignment = (ALIGN))
+#define SET_GLOBAL_ALIGNMENT(ALIGN) (maximum_field_alignment = *(alignment_stack == NULL \
+ ? &default_alignment \
+ : &alignment_stack->alignment) = (ALIGN))
-static void push_alignment PARAMS ((int, tree));
-static void pop_alignment PARAMS ((tree));
-static void mark_align_stack PARAMS ((void *));
+static void push_alignment (int, tree);
+static void pop_alignment (tree);
/* Push an alignment value onto the stack. */
static void
-push_alignment (alignment, id)
- int alignment;
- tree id;
+push_alignment (int alignment, tree id)
{
- if (alignment_stack == NULL
- || alignment_stack->alignment != alignment
- || id != NULL_TREE)
- {
- align_stack * entry;
-
- entry = (align_stack *) xmalloc (sizeof (* entry));
-
- entry->alignment = alignment;
- entry->num_pushes = 1;
- entry->id = id;
- entry->prev = alignment_stack;
-
- /* The current value of maximum_field_alignment is not necessarily
- 0 since there may be a #pragma pack(<n>) in effect; remember it
- so that we can restore it after the final #pragma pop(). */
- if (alignment_stack == NULL)
- default_alignment = maximum_field_alignment;
-
- alignment_stack = entry;
-
- maximum_field_alignment = alignment;
- }
- else
- alignment_stack->num_pushes ++;
+ align_stack * entry;
+
+ entry = GGC_NEW (align_stack);
+
+ entry->alignment = alignment;
+ entry->id = id;
+ entry->prev = alignment_stack;
+
+ /* The current value of maximum_field_alignment is not necessarily
+ 0 since there may be a #pragma pack(<n>) in effect; remember it
+ so that we can restore it after the final #pragma pop(). */
+ if (alignment_stack == NULL)
+ default_alignment = maximum_field_alignment;
+
+ alignment_stack = entry;
+
+ maximum_field_alignment = alignment;
}
/* Undo a push of an alignment onto the stack. */
static void
-pop_alignment (id)
- tree id;
+pop_alignment (tree id)
{
align_stack * entry;
-
+
if (alignment_stack == NULL)
- {
- warning ("\
-#pragma pack (pop) encountered without matching #pragma pack (push, <n>)"
- );
- return;
- }
+ GCC_BAD ("#pragma pack (pop) encountered without matching #pragma pack (push)");
/* If we got an identifier, strip away everything above the target
entry so that the next step will restore the state just below it. */
for (entry = alignment_stack; entry; entry = entry->prev)
if (entry->id == id)
{
- entry->num_pushes = 1;
alignment_stack = entry;
break;
}
if (entry == NULL)
- warning ("\
-#pragma pack(pop, %s) encountered without matching #pragma pack(push, %s, <n>)"
+ warning (OPT_Wpragmas, "\
+#pragma pack(pop, %s) encountered without matching #pragma pack(push, %s)"
, IDENTIFIER_POINTER (id), IDENTIFIER_POINTER (id));
}
- if (-- alignment_stack->num_pushes == 0)
- {
- entry = alignment_stack->prev;
-
- if (entry == NULL)
- maximum_field_alignment = default_alignment;
- else
- maximum_field_alignment = entry->alignment;
-
- free (alignment_stack);
+ entry = alignment_stack->prev;
- alignment_stack = entry;
- }
-}
-
-static void
-mark_align_stack (p)
- void *p;
-{
- align_stack *a = *(align_stack **) p;
+ maximum_field_alignment = entry ? entry->alignment : default_alignment;
- while (a)
- {
- ggc_mark_tree (a->id);
- a = a->prev;
- }
+ alignment_stack = entry;
}
#else /* not HANDLE_PRAGMA_PACK_PUSH_POP */
#define SET_GLOBAL_ALIGNMENT(ALIGN) (maximum_field_alignment = (ALIGN))
#define push_alignment(ID, N) \
- GCC_BAD("#pragma pack(push[, id], <n>) is not supported on this target")
+ GCC_BAD ("#pragma pack(push[, id], <n>) is not supported on this target")
#define pop_alignment(ID) \
- GCC_BAD("#pragma pack(pop[, id], <n>) is not supported on this target")
+ GCC_BAD ("#pragma pack(pop[, id], <n>) is not supported on this target")
#endif /* HANDLE_PRAGMA_PACK_PUSH_POP */
/* #pragma pack ()
#pragma pack (N)
-
+
+ #pragma pack (push)
#pragma pack (push, N)
+ #pragma pack (push, ID)
#pragma pack (push, ID, N)
#pragma pack (pop)
#pragma pack (pop, ID) */
static void
-handle_pragma_pack (dummy)
- cpp_reader *dummy ATTRIBUTE_UNUSED;
+handle_pragma_pack (cpp_reader * ARG_UNUSED (dummy))
{
tree x, id = 0;
int align = -1;
enum cpp_ttype token;
enum { set, push, pop } action;
- if (c_lex (&x) != CPP_OPEN_PAREN)
- GCC_BAD ("missing '(' after '#pragma pack' - ignored");
+ if (pragma_lex (&x) != CPP_OPEN_PAREN)
+ GCC_BAD ("missing %<(%> after %<#pragma pack%> - ignored");
- token = c_lex (&x);
+ token = pragma_lex (&x);
if (token == CPP_CLOSE_PAREN)
{
action = set;
- align = 0;
+ align = initial_max_fld_align;
}
else if (token == CPP_NUMBER)
{
+ if (TREE_CODE (x) != INTEGER_CST)
+ GCC_BAD ("invalid constant in %<#pragma pack%> - ignored");
align = TREE_INT_CST_LOW (x);
action = set;
- if (c_lex (&x) != CPP_CLOSE_PAREN)
- GCC_BAD ("malformed '#pragma pack' - ignored");
+ if (pragma_lex (&x) != CPP_CLOSE_PAREN)
+ GCC_BAD ("malformed %<#pragma pack%> - ignored");
}
else if (token == CPP_NAME)
{
-#define GCC_BAD_ACTION do { if (action == push) \
- GCC_BAD ("malformed '#pragma pack(push[, id], <n>)' - ignored"); \
+#define GCC_BAD_ACTION do { if (action != pop) \
+ GCC_BAD ("malformed %<#pragma pack(push[, id][, <n>])%> - ignored"); \
else \
- GCC_BAD ("malformed '#pragma pack(pop[, id])' - ignored"); \
+ GCC_BAD ("malformed %<#pragma pack(pop[, id])%> - ignored"); \
} while (0)
const char *op = IDENTIFIER_POINTER (x);
else if (!strcmp (op, "pop"))
action = pop;
else
- GCC_BAD2 ("unknown action '%s' for '#pragma pack' - ignored", op);
+ GCC_BAD2 ("unknown action %qs for %<#pragma pack%> - ignored", op);
- token = c_lex (&x);
- if (token != CPP_COMMA && action == push)
- GCC_BAD_ACTION;
-
- if (token == CPP_COMMA)
+ while ((token = pragma_lex (&x)) == CPP_COMMA)
{
- token = c_lex (&x);
- if (token == CPP_NAME)
+ token = pragma_lex (&x);
+ if (token == CPP_NAME && id == 0)
{
id = x;
- if (action == push && c_lex (&x) != CPP_COMMA)
- GCC_BAD_ACTION;
- token = c_lex (&x);
}
-
- if (action == push)
+ else if (token == CPP_NUMBER && action == push && align == -1)
{
- if (token == CPP_NUMBER)
- {
- align = TREE_INT_CST_LOW (x);
- token = c_lex (&x);
- }
- else
- GCC_BAD_ACTION;
+ if (TREE_CODE (x) != INTEGER_CST)
+ GCC_BAD ("invalid constant in %<#pragma pack%> - ignored");
+ align = TREE_INT_CST_LOW (x);
+ if (align == -1)
+ action = set;
}
+ else
+ GCC_BAD_ACTION;
}
if (token != CPP_CLOSE_PAREN)
#undef GCC_BAD_ACTION
}
else
- GCC_BAD ("malformed '#pragma pack' - ignored");
+ GCC_BAD ("malformed %<#pragma pack%> - ignored");
- if (c_lex (&x) != CPP_EOF)
- warning ("junk at end of '#pragma pack'");
+ if (pragma_lex (&x) != CPP_EOF)
+ warning (OPT_Wpragmas, "junk at end of %<#pragma pack%>");
+
+ if (flag_pack_struct)
+ GCC_BAD ("#pragma pack has no effect with -fpack-struct - ignored");
if (action != pop)
switch (align)
case 16:
align *= BITS_PER_UNIT;
break;
+ case -1:
+ if (action == push)
+ {
+ align = maximum_field_alignment;
+ break;
+ }
default:
GCC_BAD2 ("alignment must be a small power of two, not %d", align);
}
{
case set: SET_GLOBAL_ALIGNMENT (align); break;
case push: push_alignment (align, id); break;
- case pop: pop_alignment (id); break;
+ case pop: pop_alignment (id); break;
}
}
#endif /* HANDLE_PRAGMA_PACK */
-#ifdef HANDLE_PRAGMA_WEAK
-static void apply_pragma_weak PARAMS ((tree, tree));
-static void handle_pragma_weak PARAMS ((cpp_reader *));
+struct def_pragma_macro_value GTY(())
+{
+ struct def_pragma_macro_value *prev;
+ cpp_macro *value;
+};
-static tree pending_weaks;
+struct def_pragma_macro GTY(())
+{
+ hashval_t hash;
+ const char *name;
+ struct def_pragma_macro_value value;
+};
+
+static GTY((param_is (struct def_pragma_macro))) htab_t pushed_macro_table;
+
+#ifdef HANDLE_PRAGMA_PUSH_POP_MACRO
+/* Hash table control functions for pushed_macro_table. */
+static hashval_t
+dpm_hash (const void *p)
+{
+ return ((const struct def_pragma_macro *)p)->hash;
+}
+
+static int
+dpm_eq (const void *pa, const void *pb)
+{
+ const struct def_pragma_macro *a = pa, *b = pb;
+ return a->hash == b->hash && strcmp (a->name, b->name) == 0;
+}
+
+/* #pragma push_macro("MACRO_NAME")
+ #pragma pop_macro("MACRO_NAME") */
static void
-apply_pragma_weak (decl, value)
- tree decl, value;
+handle_pragma_push_macro (cpp_reader *reader)
+{
+ tree x, id = 0;
+ enum cpp_ttype token;
+ struct def_pragma_macro dummy, *c;
+ const char *macroname;
+ void **slot;
+
+ if (pragma_lex (&x) != CPP_OPEN_PAREN)
+ GCC_BAD ("missing %<(%> after %<#pragma push_macro%> - ignored");
+
+ token = pragma_lex (&id);
+
+ /* Silently ignore */
+ if (token == CPP_CLOSE_PAREN)
+ return;
+ if (token != CPP_STRING)
+ GCC_BAD ("invalid constant in %<#pragma push_macro%> - ignored");
+
+ if (pragma_lex (&x) != CPP_CLOSE_PAREN)
+ GCC_BAD ("missing %<)%> after %<#pragma push_macro%> - ignored");
+
+ if (pragma_lex (&x) != CPP_EOF)
+ warning (OPT_Wpragmas, "junk at end of %<#pragma push_macro%>");
+
+ /* Check for empty string, and silently ignore. */
+ if (TREE_STRING_LENGTH (id) < 1)
+ return;
+ macroname = TREE_STRING_POINTER (id);
+
+ if (pushed_macro_table == NULL)
+ pushed_macro_table = htab_create_ggc (15, dpm_hash, dpm_eq, 0);
+
+ dummy.hash = htab_hash_string (macroname);
+ dummy.name = macroname;
+ slot = htab_find_slot_with_hash (pushed_macro_table, &dummy,
+ dummy.hash, INSERT);
+ c = *slot;
+ if (c == NULL)
+ {
+ *slot = c = ggc_alloc (sizeof (struct def_pragma_macro));
+ c->hash = dummy.hash;
+ c->name = ggc_alloc_string (macroname, TREE_STRING_LENGTH (id) - 1);
+ c->value.prev = NULL;
+ }
+ else
+ {
+ struct def_pragma_macro_value *v;
+ v = ggc_alloc (sizeof (struct def_pragma_macro_value));
+ *v = c->value;
+ c->value.prev = v;
+ }
+
+ c->value.value = cpp_push_definition (reader, macroname);
+}
+
+static void
+handle_pragma_pop_macro (cpp_reader *reader)
+{
+ tree x, id = 0;
+ enum cpp_ttype token;
+ struct def_pragma_macro dummy, *c;
+ const char *macroname;
+ void **slot;
+
+ if (pragma_lex (&x) != CPP_OPEN_PAREN)
+ GCC_BAD ("missing %<(%> after %<#pragma pop_macro%> - ignored");
+
+ token = pragma_lex (&id);
+
+ /* Silently ignore */
+ if (token == CPP_CLOSE_PAREN)
+ return;
+ if (token != CPP_STRING)
+ GCC_BAD ("invalid constant in %<#pragma pop_macro%> - ignored");
+
+ if (pragma_lex (&x) != CPP_CLOSE_PAREN)
+ GCC_BAD ("missing %<)%> after %<#pragma pop_macro%> - ignored");
+
+ if (pragma_lex (&x) != CPP_EOF)
+ warning (OPT_Wpragmas, "junk at end of %<#pragma pop_macro%>");
+
+ /* Check for empty string, and silently ignore. */
+ if (TREE_STRING_LENGTH (id) < 1)
+ return;
+ macroname = TREE_STRING_POINTER (id);
+
+ dummy.hash = htab_hash_string (macroname);
+ dummy.name = macroname;
+ slot = htab_find_slot_with_hash (pushed_macro_table, &dummy,
+ dummy.hash, NO_INSERT);
+ if (slot == NULL)
+ return;
+ c = *slot;
+
+ cpp_pop_definition (reader, c->name, c->value.value);
+
+ if (c->value.prev)
+ c->value = *c->value.prev;
+ else
+ htab_clear_slot (pushed_macro_table, slot);
+}
+#endif /* HANDLE_PRAGMA_PUSH_POP_MACRO */
+
+static GTY(()) tree pending_weaks;
+
+#ifdef HANDLE_PRAGMA_WEAK
+static void apply_pragma_weak (tree, tree);
+static void handle_pragma_weak (cpp_reader *);
+
+static void
+apply_pragma_weak (tree decl, tree value)
{
if (value)
- decl_attributes (&decl, build_tree_list (get_identifier ("alias"),
- build_tree_list (NULL, value)),
- 0);
+ {
+ value = build_string (IDENTIFIER_LENGTH (value),
+ IDENTIFIER_POINTER (value));
+ decl_attributes (&decl, build_tree_list (get_identifier ("alias"),
+ build_tree_list (NULL, value)),
+ 0);
+ }
+
+ if (SUPPORTS_WEAK && DECL_EXTERNAL (decl) && TREE_USED (decl)
+ && !DECL_WEAK (decl) /* Don't complain about a redundant #pragma. */
+ && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
+ warning (OPT_Wpragmas, "applying #pragma weak %q+D after first use "
+ "results in unspecified behavior", decl);
+
declare_weak (decl);
}
void
-maybe_apply_pragma_weak (decl)
- tree decl;
+maybe_apply_pragma_weak (tree decl)
{
tree *p, t, id;
- /* Copied from the check in set_decl_assembler_name. */
- if (TREE_CODE (decl) == FUNCTION_DECL
- || (TREE_CODE (decl) == VAR_DECL
- && (TREE_STATIC (decl)
- || DECL_EXTERNAL (decl)
- || TREE_PUBLIC (decl))))
- id = DECL_ASSEMBLER_NAME (decl);
- else
+ /* Avoid asking for DECL_ASSEMBLER_NAME when it's not needed. */
+
+ /* No weak symbols pending, take the short-cut. */
+ if (!pending_weaks)
+ return;
+ /* If it's not visible outside this file, it doesn't matter whether
+ it's weak. */
+ if (!DECL_EXTERNAL (decl) && !TREE_PUBLIC (decl))
+ return;
+ /* If it's not a function or a variable, it can't be weak.
+ FIXME: what kinds of things are visible outside this file but
+ aren't functions or variables? Should this be an assert instead? */
+ if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
return;
+ id = DECL_ASSEMBLER_NAME (decl);
+
for (p = &pending_weaks; (t = *p) ; p = &TREE_CHAIN (t))
if (id == TREE_PURPOSE (t))
{
}
}
+/* Process all "#pragma weak A = B" directives where we have not seen
+ a decl for A. */
+void
+maybe_apply_pending_pragma_weaks (void)
+{
+ tree *p, t, alias_id, id, decl, *next;
+
+ for (p = &pending_weaks; (t = *p) ; p = next)
+ {
+ next = &TREE_CHAIN (t);
+ alias_id = TREE_PURPOSE (t);
+ id = TREE_VALUE (t);
+
+ if (TREE_VALUE (t) == NULL)
+ continue;
+
+ decl = build_decl (FUNCTION_DECL, alias_id, default_function_type);
+
+ DECL_ARTIFICIAL (decl) = 1;
+ TREE_PUBLIC (decl) = 1;
+ DECL_EXTERNAL (decl) = 1;
+ DECL_WEAK (decl) = 1;
+
+ assemble_alias (decl, id);
+ }
+}
+
/* #pragma weak name [= value] */
static void
-handle_pragma_weak (dummy)
- cpp_reader *dummy ATTRIBUTE_UNUSED;
+handle_pragma_weak (cpp_reader * ARG_UNUSED (dummy))
{
tree name, value, x, decl;
enum cpp_ttype t;
value = 0;
- if (c_lex (&name) != CPP_NAME)
+ if (pragma_lex (&name) != CPP_NAME)
GCC_BAD ("malformed #pragma weak, ignored");
- t = c_lex (&x);
+ t = pragma_lex (&x);
if (t == CPP_EQ)
{
- if (c_lex (&value) != CPP_NAME)
+ if (pragma_lex (&value) != CPP_NAME)
GCC_BAD ("malformed #pragma weak, ignored");
- t = c_lex (&x);
+ t = pragma_lex (&x);
}
if (t != CPP_EOF)
- warning ("junk at end of #pragma weak");
+ warning (OPT_Wpragmas, "junk at end of %<#pragma weak%>");
decl = identifier_global_value (name);
- if (decl && TREE_CODE_CLASS (TREE_CODE (decl)) == 'd')
- apply_pragma_weak (decl, value);
+ if (decl && DECL_P (decl))
+ {
+ apply_pragma_weak (decl, value);
+ if (value)
+ assemble_alias (decl, value);
+ }
else
pending_weaks = tree_cons (name, value, pending_weaks);
}
#else
void
-maybe_apply_pragma_weak (decl)
- tree decl ATTRIBUTE_UNUSED;
+maybe_apply_pragma_weak (tree ARG_UNUSED (decl))
+{
+}
+
+void
+maybe_apply_pending_pragma_weaks (void)
{
}
#endif /* HANDLE_PRAGMA_WEAK */
-#ifdef HANDLE_PRAGMA_REDEFINE_EXTNAME
-static void handle_pragma_redefine_extname PARAMS ((cpp_reader *));
+/* GCC supports two #pragma directives for renaming the external
+ symbol associated with a declaration (DECL_ASSEMBLER_NAME), for
+ compatibility with the Solaris and Tru64 system headers. GCC also
+ has its own notation for this, __asm__("name") annotations.
+
+ Corner cases of these features and their interaction:
+
+ 1) Both pragmas silently apply only to declarations with external
+ linkage (that is, TREE_PUBLIC || DECL_EXTERNAL). Asm labels
+ do not have this restriction.
+
+ 2) In C++, both #pragmas silently apply only to extern "C" declarations.
+ Asm labels do not have this restriction.
+
+ 3) If any of the three ways of changing DECL_ASSEMBLER_NAME is
+ applied to a decl whose DECL_ASSEMBLER_NAME is already set, and the
+ new name is different, a warning issues and the name does not change.
+
+ 4) The "source name" for #pragma redefine_extname is the DECL_NAME,
+ *not* the DECL_ASSEMBLER_NAME.
+
+ 5) If #pragma extern_prefix is in effect and a declaration occurs
+ with an __asm__ name, the #pragma extern_prefix is silently
+ ignored for that declaration.
+
+ 6) If #pragma extern_prefix and #pragma redefine_extname apply to
+ the same declaration, whichever triggered first wins, and a warning
+ is issued. (We would like to have #pragma redefine_extname always
+ win, but it can appear either before or after the declaration, and
+ if it appears afterward, we have no way of knowing whether a modified
+ DECL_ASSEMBLER_NAME is due to #pragma extern_prefix.) */
+
+static GTY(()) tree pending_redefine_extname;
-static tree pending_redefine_extname;
+static void handle_pragma_redefine_extname (cpp_reader *);
-/* #pragma redefined_extname oldname newname */
+/* #pragma redefine_extname oldname newname */
static void
-handle_pragma_redefine_extname (dummy)
- cpp_reader *dummy ATTRIBUTE_UNUSED;
+handle_pragma_redefine_extname (cpp_reader * ARG_UNUSED (dummy))
{
tree oldname, newname, decl, x;
enum cpp_ttype t;
- if (c_lex (&oldname) != CPP_NAME)
- {
- warning ("malformed #pragma redefine_extname, ignored");
- return;
- }
- if (c_lex (&newname) != CPP_NAME)
+ if (pragma_lex (&oldname) != CPP_NAME)
+ GCC_BAD ("malformed #pragma redefine_extname, ignored");
+ if (pragma_lex (&newname) != CPP_NAME)
+ GCC_BAD ("malformed #pragma redefine_extname, ignored");
+ t = pragma_lex (&x);
+ if (t != CPP_EOF)
+ warning (OPT_Wpragmas, "junk at end of %<#pragma redefine_extname%>");
+
+ if (!flag_mudflap && !targetm.handle_pragma_redefine_extname)
{
- warning ("malformed #pragma redefine_extname, ignored");
+ if (warn_unknown_pragmas > in_system_header)
+ warning (OPT_Wunknown_pragmas,
+ "#pragma redefine_extname not supported on this target");
return;
}
- t = c_lex (&x);
- if (t != CPP_EOF)
- warning ("junk at end of #pragma redefine_extname");
decl = identifier_global_value (oldname);
- if (decl && TREE_CODE_CLASS (TREE_CODE (decl)) == 'd')
+ if (decl
+ && (TREE_PUBLIC (decl) || DECL_EXTERNAL (decl))
+ && (TREE_CODE (decl) == FUNCTION_DECL
+ || TREE_CODE (decl) == VAR_DECL)
+ && has_c_linkage (decl))
{
- if (DECL_ASSEMBLER_NAME_SET_P (decl)
- && DECL_ASSEMBLER_NAME (decl) != newname)
- warning ("#pragma redefine_extname conflicts with declaration");
- SET_DECL_ASSEMBLER_NAME (decl, newname);
+ if (DECL_ASSEMBLER_NAME_SET_P (decl))
+ {
+ const char *name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
+ name = targetm.strip_name_encoding (name);
+
+ if (strcmp (name, IDENTIFIER_POINTER (newname)))
+ warning (OPT_Wpragmas, "#pragma redefine_extname ignored due to "
+ "conflict with previous rename");
+ }
+ else
+ change_decl_assembler_name (decl, newname);
}
else
- pending_redefine_extname
- = tree_cons (oldname, newname, pending_redefine_extname);
+ /* We have to add this to the rename list even if there's already
+ a global value that doesn't meet the above criteria, because in
+ C++ "struct foo {...};" puts "foo" in the current namespace but
+ does *not* conflict with a subsequent declaration of a function
+ or variable foo. See g++.dg/other/pragma-re-2.C. */
+ add_to_renaming_pragma_list (oldname, newname);
}
-#endif
-#ifdef HANDLE_PRAGMA_EXTERN_PREFIX
-static void handle_pragma_extern_prefix PARAMS ((cpp_reader *));
+/* This is called from here and from ia64.c. */
+void
+add_to_renaming_pragma_list (tree oldname, tree newname)
+{
+ tree previous = purpose_member (oldname, pending_redefine_extname);
+ if (previous)
+ {
+ if (TREE_VALUE (previous) != newname)
+ warning (OPT_Wpragmas, "#pragma redefine_extname ignored due to "
+ "conflict with previous #pragma redefine_extname");
+ return;
+ }
-static tree pragma_extern_prefix;
+ pending_redefine_extname
+ = tree_cons (oldname, newname, pending_redefine_extname);
+}
+
+static GTY(()) tree pragma_extern_prefix;
/* #pragma extern_prefix "prefix" */
static void
-handle_pragma_extern_prefix (dummy)
- cpp_reader *dummy ATTRIBUTE_UNUSED;
+handle_pragma_extern_prefix (cpp_reader * ARG_UNUSED (dummy))
{
tree prefix, x;
enum cpp_ttype t;
- if (c_lex (&prefix) != CPP_STRING)
- {
- warning ("malformed #pragma extern_prefix, ignored");
- return;
- }
- t = c_lex (&x);
+ if (pragma_lex (&prefix) != CPP_STRING)
+ GCC_BAD ("malformed #pragma extern_prefix, ignored");
+ t = pragma_lex (&x);
if (t != CPP_EOF)
- warning ("junk at end of #pragma extern_prefix");
-
- /* Note that the length includes the null terminator. */
- pragma_extern_prefix = (TREE_STRING_LENGTH (prefix) > 1 ? prefix : NULL);
+ warning (OPT_Wpragmas, "junk at end of %<#pragma extern_prefix%>");
+
+ if (targetm.handle_pragma_extern_prefix)
+ /* Note that the length includes the null terminator. */
+ pragma_extern_prefix = (TREE_STRING_LENGTH (prefix) > 1 ? prefix : NULL);
+ else if (warn_unknown_pragmas > in_system_header)
+ warning (OPT_Wunknown_pragmas,
+ "#pragma extern_prefix not supported on this target");
}
-#endif
-/* Hook from the front ends to apply the results of one of the preceeding
+/* Hook from the front ends to apply the results of one of the preceding
pragmas that rename variables. */
tree
-maybe_apply_renaming_pragma (decl, asmname)
- tree decl, asmname;
+maybe_apply_renaming_pragma (tree decl, tree asmname)
{
- tree oldname;
-
- /* Copied from the check in set_decl_assembler_name. */
- if (TREE_CODE (decl) == FUNCTION_DECL
- || (TREE_CODE (decl) == VAR_DECL
- && (TREE_STATIC (decl)
- || DECL_EXTERNAL (decl)
- || TREE_PUBLIC (decl))))
- oldname = DECL_ASSEMBLER_NAME (decl);
- else
+ tree *p, t;
+
+ /* The renaming pragmas are only applied to declarations with
+ external linkage. */
+ if ((TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
+ || (!TREE_PUBLIC (decl) && !DECL_EXTERNAL (decl))
+ || !has_c_linkage (decl))
+ return asmname;
+
+ /* If the DECL_ASSEMBLER_NAME is already set, it does not change,
+ but we may warn about a rename that conflicts. */
+ if (DECL_ASSEMBLER_NAME_SET_P (decl))
+ {
+ const char *oldname = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
+ oldname = targetm.strip_name_encoding (oldname);
+
+ if (asmname && strcmp (TREE_STRING_POINTER (asmname), oldname))
+ warning (OPT_Wpragmas, "asm declaration ignored due to "
+ "conflict with previous rename");
+
+ /* Take any pending redefine_extname off the list. */
+ for (p = &pending_redefine_extname; (t = *p); p = &TREE_CHAIN (t))
+ if (DECL_NAME (decl) == TREE_PURPOSE (t))
+ {
+ /* Only warn if there is a conflict. */
+ if (strcmp (IDENTIFIER_POINTER (TREE_VALUE (t)), oldname))
+ warning (OPT_Wpragmas, "#pragma redefine_extname ignored due to "
+ "conflict with previous rename");
+
+ *p = TREE_CHAIN (t);
+ break;
+ }
+ return 0;
+ }
+
+ /* Find out if we have a pending #pragma redefine_extname. */
+ for (p = &pending_redefine_extname; (t = *p); p = &TREE_CHAIN (t))
+ if (DECL_NAME (decl) == TREE_PURPOSE (t))
+ {
+ tree newname = TREE_VALUE (t);
+ *p = TREE_CHAIN (t);
+
+ /* If we already have an asmname, #pragma redefine_extname is
+ ignored (with a warning if it conflicts). */
+ if (asmname)
+ {
+ if (strcmp (TREE_STRING_POINTER (asmname),
+ IDENTIFIER_POINTER (newname)) != 0)
+ warning (OPT_Wpragmas, "#pragma redefine_extname ignored due to "
+ "conflict with __asm__ declaration");
+ return asmname;
+ }
+
+ /* Otherwise we use what we've got; #pragma extern_prefix is
+ silently ignored. */
+ return build_string (IDENTIFIER_LENGTH (newname),
+ IDENTIFIER_POINTER (newname));
+ }
+
+ /* If we've got an asmname, #pragma extern_prefix is silently ignored. */
+ if (asmname)
return asmname;
- /* If the name begins with a *, that's a sign of an asmname attached to
- a previous declaration. */
- if (IDENTIFIER_POINTER (oldname)[0] == '*')
+ /* If #pragma extern_prefix is in effect, apply it. */
+ if (pragma_extern_prefix)
{
- const char *oldasmname = IDENTIFIER_POINTER (oldname) + 1;
- if (asmname && strcmp (TREE_STRING_POINTER (asmname), oldasmname) != 0)
- warning ("asm declaration conficts with previous rename");
- asmname = build_string (strlen (oldasmname), oldasmname);
+ const char *prefix = TREE_STRING_POINTER (pragma_extern_prefix);
+ size_t plen = TREE_STRING_LENGTH (pragma_extern_prefix) - 1;
+
+ const char *id = IDENTIFIER_POINTER (DECL_NAME (decl));
+ size_t ilen = IDENTIFIER_LENGTH (DECL_NAME (decl));
+
+ char *newname = (char *) alloca (plen + ilen + 1);
+
+ memcpy (newname, prefix, plen);
+ memcpy (newname + plen, id, ilen + 1);
+
+ return build_string (plen + ilen, newname);
}
-#ifdef HANDLE_PRAGMA_REDEFINE_EXTNAME
- {
- tree *p, t;
+ /* Nada. */
+ return 0;
+}
- for (p = &pending_redefine_extname; (t = *p) ; p = &TREE_CHAIN (t))
- if (oldname == TREE_PURPOSE (t))
- {
- const char *newname = IDENTIFIER_POINTER (TREE_VALUE (t));
- if (asmname && strcmp (TREE_STRING_POINTER (asmname), newname) != 0)
- warning ("#pragma redefine_extname conflicts with declaration");
- *p = TREE_CHAIN (t);
+#ifdef HANDLE_PRAGMA_VISIBILITY
+static void handle_pragma_visibility (cpp_reader *);
- return build_string (strlen (newname), newname);
+typedef enum symbol_visibility visibility;
+DEF_VEC_I (visibility);
+DEF_VEC_ALLOC_I (visibility, heap);
+static VEC (visibility, heap) *visstack;
+
+/* Push the visibility indicated by STR onto the top of the #pragma
+ visibility stack. */
+
+void
+push_visibility (const char *str)
+{
+ VEC_safe_push (visibility, heap, visstack,
+ default_visibility);
+ if (!strcmp (str, "default"))
+ default_visibility = VISIBILITY_DEFAULT;
+ else if (!strcmp (str, "internal"))
+ default_visibility = VISIBILITY_INTERNAL;
+ else if (!strcmp (str, "hidden"))
+ default_visibility = VISIBILITY_HIDDEN;
+ else if (!strcmp (str, "protected"))
+ default_visibility = VISIBILITY_PROTECTED;
+ else
+ GCC_BAD ("#pragma GCC visibility push() must specify default, internal, hidden or protected");
+ visibility_options.inpragma = 1;
+}
+
+/* Pop a level of the #pragma visibility stack. */
+
+void
+pop_visibility (void)
+{
+ default_visibility = VEC_pop (visibility, visstack);
+ visibility_options.inpragma
+ = VEC_length (visibility, visstack) != 0;
+}
+
+/* Sets the default visibility for symbols to something other than that
+ specified on the command line. */
+
+static void
+handle_pragma_visibility (cpp_reader *dummy ATTRIBUTE_UNUSED)
+{
+ /* Form is #pragma GCC visibility push(hidden)|pop */
+ tree x;
+ enum cpp_ttype token;
+ enum { bad, push, pop } action = bad;
+
+ token = pragma_lex (&x);
+ if (token == CPP_NAME)
+ {
+ const char *op = IDENTIFIER_POINTER (x);
+ if (!strcmp (op, "push"))
+ action = push;
+ else if (!strcmp (op, "pop"))
+ action = pop;
+ }
+ if (bad == action)
+ GCC_BAD ("#pragma GCC visibility must be followed by push or pop");
+ else
+ {
+ if (pop == action)
+ {
+ if (!VEC_length (visibility, visstack))
+ GCC_BAD ("no matching push for %<#pragma GCC visibility pop%>");
+ else
+ pop_visibility ();
+ }
+ else
+ {
+ if (pragma_lex (&x) != CPP_OPEN_PAREN)
+ GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
+ token = pragma_lex (&x);
+ if (token != CPP_NAME)
+ GCC_BAD ("malformed #pragma GCC visibility push");
+ else
+ push_visibility (IDENTIFIER_POINTER (x));
+ if (pragma_lex (&x) != CPP_CLOSE_PAREN)
+ GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
}
- }
+ }
+ if (pragma_lex (&x) != CPP_EOF)
+ warning (OPT_Wpragmas, "junk at end of %<#pragma GCC visibility%>");
+}
+
#endif
-#ifdef HANDLE_PRAGMA_EXTERN_PREFIX
- if (pragma_extern_prefix && !asmname)
+static void
+handle_pragma_diagnostic(cpp_reader *ARG_UNUSED(dummy))
+{
+ const char *kind_string, *option_string;
+ unsigned int option_index;
+ enum cpp_ttype token;
+ diagnostic_t kind;
+ tree x;
+
+ if (cfun)
{
- char *x = concat (TREE_STRING_POINTER (pragma_extern_prefix),
- IDENTIFIER_POINTER (oldname), NULL);
- asmname = build_string (strlen (x), x);
- free (x);
- return asmname;
+ error ("#pragma GCC diagnostic not allowed inside functions");
+ return;
}
-#endif
- return asmname;
+ token = pragma_lex (&x);
+ if (token != CPP_NAME)
+ GCC_BAD ("missing [error|warning|ignored] after %<#pragma GCC diagnostic%>");
+ kind_string = IDENTIFIER_POINTER (x);
+ if (strcmp (kind_string, "error") == 0)
+ kind = DK_ERROR;
+ else if (strcmp (kind_string, "warning") == 0)
+ kind = DK_WARNING;
+ else if (strcmp (kind_string, "ignored") == 0)
+ kind = DK_IGNORED;
+ else
+ GCC_BAD ("expected [error|warning|ignored] after %<#pragma GCC diagnostic%>");
+
+ token = pragma_lex (&x);
+ if (token != CPP_STRING)
+ GCC_BAD ("missing option after %<#pragma GCC diagnostic%> kind");
+ option_string = TREE_STRING_POINTER (x);
+ for (option_index = 0; option_index < cl_options_count; option_index++)
+ if (strcmp (cl_options[option_index].opt_text, option_string) == 0)
+ {
+ /* This overrides -Werror, for example. */
+ diagnostic_classify_diagnostic (global_dc, option_index, kind);
+ /* This makes sure the option is enabled, like -Wfoo would do. */
+ if (cl_options[option_index].var_type == CLVC_BOOLEAN
+ && cl_options[option_index].flag_var
+ && kind != DK_IGNORED)
+ *(int *) cl_options[option_index].flag_var = 1;
+ return;
+ }
+ GCC_BAD ("unknown option after %<#pragma GCC diagnostic%> kind");
}
+/* A vector of registered pragma callbacks. */
+
+DEF_VEC_O (pragma_handler);
+DEF_VEC_ALLOC_O (pragma_handler, heap);
+
+static VEC(pragma_handler, heap) *registered_pragmas;
+
+/* Front-end wrappers for pragma registration to avoid dragging
+ cpplib.h in almost everywhere. */
+
+static void
+c_register_pragma_1 (const char *space, const char *name,
+ pragma_handler handler, bool allow_expansion)
+{
+ unsigned id;
+
+ VEC_safe_push (pragma_handler, heap, registered_pragmas, &handler);
+ id = VEC_length (pragma_handler, registered_pragmas);
+ id += PRAGMA_FIRST_EXTERNAL - 1;
+
+ /* The C++ front end allocates 6 bits in cp_token; the C front end
+ allocates 7 bits in c_token. At present this is sufficient. */
+ gcc_assert (id < 64);
+
+ cpp_register_deferred_pragma (parse_in, space, name, id,
+ allow_expansion, false);
+}
+
+void
+c_register_pragma (const char *space, const char *name, pragma_handler handler)
+{
+ c_register_pragma_1 (space, name, handler, false);
+}
+
+void
+c_register_pragma_with_expansion (const char *space, const char *name,
+ pragma_handler handler)
+{
+ c_register_pragma_1 (space, name, handler, true);
+}
+
+void
+c_invoke_pragma_handler (unsigned int id)
+{
+ pragma_handler handler;
+
+ id -= PRAGMA_FIRST_EXTERNAL;
+ handler = *VEC_index (pragma_handler, registered_pragmas, id);
+
+ handler (parse_in);
+}
+
+/* Set up front-end pragmas. */
void
-init_pragma ()
+init_pragma (void)
{
+ if (flag_openmp && !flag_preprocess_only)
+ {
+ struct omp_pragma_def { const char *name; unsigned int id; };
+ static const struct omp_pragma_def omp_pragmas[] = {
+ { "atomic", PRAGMA_OMP_ATOMIC },
+ { "barrier", PRAGMA_OMP_BARRIER },
+ { "critical", PRAGMA_OMP_CRITICAL },
+ { "flush", PRAGMA_OMP_FLUSH },
+ { "for", PRAGMA_OMP_FOR },
+ { "master", PRAGMA_OMP_MASTER },
+ { "ordered", PRAGMA_OMP_ORDERED },
+ { "parallel", PRAGMA_OMP_PARALLEL },
+ { "section", PRAGMA_OMP_SECTION },
+ { "sections", PRAGMA_OMP_SECTIONS },
+ { "single", PRAGMA_OMP_SINGLE },
+ { "threadprivate", PRAGMA_OMP_THREADPRIVATE }
+ };
+
+ const int n_omp_pragmas = sizeof (omp_pragmas) / sizeof (*omp_pragmas);
+ int i;
+
+ for (i = 0; i < n_omp_pragmas; ++i)
+ cpp_register_deferred_pragma (parse_in, "omp", omp_pragmas[i].name,
+ omp_pragmas[i].id, true, true);
+ }
+
+ cpp_register_deferred_pragma (parse_in, "GCC", "pch_preprocess",
+ PRAGMA_GCC_PCH_PREPROCESS, false, false);
+
#ifdef HANDLE_PRAGMA_PACK
- cpp_register_pragma (parse_in, 0, "pack", handle_pragma_pack);
+#ifdef HANDLE_PRAGMA_PACK_WITH_EXPANSION
+ c_register_pragma_with_expansion (0, "pack", handle_pragma_pack);
+#else
+ c_register_pragma (0, "pack", handle_pragma_pack);
#endif
-#ifdef HANDLE_PRAGMA_WEAK
- cpp_register_pragma (parse_in, 0, "weak", handle_pragma_weak);
- ggc_add_tree_root (&pending_weaks, 1);
#endif
-#ifdef HANDLE_PRAGMA_REDEFINE_EXTNAME
- cpp_register_pragma (parse_in, 0, "redefine_extname",
- handle_pragma_redefine_extname);
- ggc_add_tree_root (&pending_redefine_extname, 1);
+#ifdef HANDLE_PRAGMA_PUSH_POP_MACRO
+ c_register_pragma (0 ,"push_macro", handle_pragma_push_macro);
+ c_register_pragma (0 ,"pop_macro", handle_pragma_pop_macro);
#endif
-#ifdef HANDLE_PRAGMA_EXTERN_PREFIX
- cpp_register_pragma (parse_in, 0, "extern_prefix",
- handle_pragma_extern_prefix);
- ggc_add_tree_root (&pragma_extern_prefix, 1);
+#ifdef HANDLE_PRAGMA_WEAK
+ c_register_pragma (0, "weak", handle_pragma_weak);
#endif
-
-#ifdef REGISTER_TARGET_PRAGMAS
- REGISTER_TARGET_PRAGMAS (parse_in);
+#ifdef HANDLE_PRAGMA_VISIBILITY
+ c_register_pragma ("GCC", "visibility", handle_pragma_visibility);
#endif
-#ifdef HANDLE_PRAGMA_PACK_PUSH_POP
- ggc_add_root (&alignment_stack, 1, sizeof(alignment_stack),
- mark_align_stack);
+ c_register_pragma ("GCC", "diagnostic", handle_pragma_diagnostic);
+
+ c_register_pragma_with_expansion (0, "redefine_extname", handle_pragma_redefine_extname);
+ c_register_pragma (0, "extern_prefix", handle_pragma_extern_prefix);
+
+#ifdef REGISTER_TARGET_PRAGMAS
+ REGISTER_TARGET_PRAGMAS ();
#endif
}
+
+#include "gt-c-pragma.h"
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