--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/c-pragma.c	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,1347 @@
+/* Handle #pragma, system V.4 style.  Supports #pragma weak and #pragma pack.
+   Copyright (C) 1992, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
+   2006, 2007, 2008 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 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+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 "cpplib.h"
+#include "c-pragma.h"
+#include "flags.h"
+#include "toplev.h"
+#include "ggc.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(gmsgid) \
+  do { warning (OPT_Wpragmas, gmsgid); return; } while (0)
+#define GCC_BAD2(gmsgid, arg) \
+  do { warning (OPT_Wpragmas, gmsgid, arg); return; } while (0)
+
+typedef struct align_stack GTY(())
+{
+  int		       alignment;
+  tree		       id;
+  struct align_stack * prev;
+} align_stack;
+
+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()
+   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) (maximum_field_alignment = *(alignment_stack == NULL \
+	? &default_alignment \
+	: &alignment_stack->alignment) = (ALIGN))
+
+static void push_alignment (int, tree);
+static void pop_alignment (tree);
+
+/* Push an alignment value onto the stack.  */
+static void
+push_alignment (int alignment, tree id)
+{
+  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 (tree id)
+{
+  align_stack * entry;
+
+  if (alignment_stack == NULL)
+    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.  */
+  if (id)
+    {
+      for (entry = alignment_stack; entry; entry = entry->prev)
+	if (entry->id == id)
+	  {
+	    alignment_stack = entry;
+	    break;
+	  }
+      if (entry == NULL)
+	warning (OPT_Wpragmas, "\
+#pragma pack(pop, %s) encountered without matching #pragma pack(push, %s)"
+		 , IDENTIFIER_POINTER (id), IDENTIFIER_POINTER (id));
+    }
+
+  entry = alignment_stack->prev;
+
+  maximum_field_alignment = entry ? entry->alignment : default_alignment;
+
+  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")
+#define pop_alignment(ID) \
+    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 (cpp_reader * ARG_UNUSED (dummy))
+{
+  tree x, id = 0;
+  int align = -1;
+  enum cpp_ttype token;
+  enum { set, push, pop } action;
+
+  if (pragma_lex (&x) != CPP_OPEN_PAREN)
+    GCC_BAD ("missing %<(%> after %<#pragma pack%> - ignored");
+
+  token = pragma_lex (&x);
+  if (token == CPP_CLOSE_PAREN)
+    {
+      action = set;
+      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 (pragma_lex (&x) != CPP_CLOSE_PAREN)
+	GCC_BAD ("malformed %<#pragma pack%> - ignored");
+    }
+  else if (token == CPP_NAME)
+    {
+#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"); \
+	} while (0)
+
+      const char *op = IDENTIFIER_POINTER (x);
+      if (!strcmp (op, "push"))
+	action = push;
+      else if (!strcmp (op, "pop"))
+	action = pop;
+      else
+	GCC_BAD2 ("unknown action %qs for %<#pragma pack%> - ignored", op);
+
+      while ((token = pragma_lex (&x)) == CPP_COMMA)
+	{
+	  token = pragma_lex (&x);
+	  if (token == CPP_NAME && id == 0)
+	    {
+	      id = x;
+	    }
+	  else if (token == CPP_NUMBER && action == push && align == -1)
+	    {
+	      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)
+	GCC_BAD_ACTION;
+#undef GCC_BAD_ACTION
+    }
+  else
+    GCC_BAD ("malformed %<#pragma pack%> - ignored");
+
+  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 0:
+      case 1:
+      case 2:
+      case 4:
+      case 8:
+      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);
+      }
+
+  switch (action)
+    {
+    case set:   SET_GLOBAL_ALIGNMENT (align);  break;
+    case push:  push_alignment (align, id);    break;
+    case pop:   pop_alignment (id);	       break;
+    }
+}
+#endif  /* HANDLE_PRAGMA_PACK */
+
+struct def_pragma_macro_value GTY(())
+{
+  struct def_pragma_macro_value *prev;
+  cpp_macro *value;
+};
+
+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 *const a = (const struct def_pragma_macro *) pa,
+    *const b = (const struct def_pragma_macro *) pb;
+  return a->hash == b->hash && strcmp (a->name, b->name) == 0;
+}
+
+/* #pragma push_macro("MACRO_NAME")
+   #pragma pop_macro("MACRO_NAME") */
+
+static void
+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 = (struct def_pragma_macro *) *slot;
+  if (c == NULL)
+    {
+      *slot = c = GGC_NEW (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_NEW (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 = NULL;
+
+  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;
+  if (pushed_macro_table)
+    slot = htab_find_slot_with_hash (pushed_macro_table, &dummy,
+				     dummy.hash, NO_INSERT);
+  if (slot == NULL)
+    return;
+  c = (struct def_pragma_macro *) *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)
+    {
+      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 (tree decl)
+{
+  tree *p, t, id;
+
+  /* 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))
+      {
+	apply_pragma_weak (decl, TREE_VALUE (t));
+	*p = TREE_CHAIN (t);
+	break;
+      }
+}
+
+/* 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 (cpp_reader * ARG_UNUSED (dummy))
+{
+  tree name, value, x, decl;
+  enum cpp_ttype t;
+
+  value = 0;
+
+  if (pragma_lex (&name) != CPP_NAME)
+    GCC_BAD ("malformed #pragma weak, ignored");
+  t = pragma_lex (&x);
+  if (t == CPP_EQ)
+    {
+      if (pragma_lex (&value) != CPP_NAME)
+	GCC_BAD ("malformed #pragma weak, ignored");
+      t = pragma_lex (&x);
+    }
+  if (t != CPP_EOF)
+    warning (OPT_Wpragmas, "junk at end of %<#pragma weak%>");
+
+  decl = identifier_global_value (name);
+  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 (tree ARG_UNUSED (decl))
+{
+}
+
+void
+maybe_apply_pending_pragma_weaks (void)
+{
+}
+#endif /* HANDLE_PRAGMA_WEAK */
+
+/* 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 void handle_pragma_redefine_extname (cpp_reader *);
+
+/* #pragma redefine_extname oldname newname */
+static void
+handle_pragma_redefine_extname (cpp_reader * ARG_UNUSED (dummy))
+{
+  tree oldname, newname, decl, x;
+  enum cpp_ttype t;
+
+  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)
+    {
+      if (warn_unknown_pragmas > in_system_header)
+	warning (OPT_Wunknown_pragmas,
+		 "#pragma redefine_extname not supported on this target");
+      return;
+    }
+
+  decl = identifier_global_value (oldname);
+  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))
+	{
+	  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
+    /* 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);
+}
+
+/* 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;
+    }
+
+  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 (cpp_reader * ARG_UNUSED (dummy))
+{
+  tree prefix, x;
+  enum cpp_ttype t;
+
+  if (pragma_lex (&prefix) != CPP_STRING)
+    GCC_BAD ("malformed #pragma extern_prefix, ignored");
+  t = pragma_lex (&x);
+  if (t != CPP_EOF)
+    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");
+}
+
+/* Hook from the front ends to apply the results of one of the preceding
+   pragmas that rename variables.  */
+
+tree
+maybe_apply_renaming_pragma (tree decl, tree asmname)
+{
+  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 #pragma extern_prefix is in effect, apply it.  */
+  if (pragma_extern_prefix)
+    {
+      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);
+    }
+
+  /* Nada.  */
+  return 0;
+}
+
+
+#ifdef HANDLE_PRAGMA_VISIBILITY
+static void handle_pragma_visibility (cpp_reader *);
+
+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
+
+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)
+    {
+      error ("#pragma GCC diagnostic not allowed inside functions");
+      return;
+    }
+
+  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");
+}
+
+/*  Parse #pragma GCC target (xxx) to set target specific options.  */
+static void
+handle_pragma_target(cpp_reader *ARG_UNUSED(dummy))
+{
+  enum cpp_ttype token;
+  tree x;
+  bool close_paren_needed_p = false;
+
+  if (cfun)
+    {
+      error ("#pragma GCC option is not allowed inside functions");
+      return;
+    }
+
+  token = pragma_lex (&x);
+  if (token == CPP_OPEN_PAREN)
+    {
+      close_paren_needed_p = true;
+      token = pragma_lex (&x);
+    }
+
+  if (token != CPP_STRING)
+    {
+      GCC_BAD ("%<#pragma GCC option%> is not a string");
+      return;
+    }
+
+  /* Strings are user options.  */
+  else
+    {
+      tree args = NULL_TREE;
+
+      do
+	{
+	  /* Build up the strings now as a tree linked list.  Skip empty
+	     strings.  */
+	  if (TREE_STRING_LENGTH (x) > 0)
+	    args = tree_cons (NULL_TREE, x, args);
+
+	  token = pragma_lex (&x);
+	  while (token == CPP_COMMA)
+	    token = pragma_lex (&x);
+	}
+      while (token == CPP_STRING);
+
+      if (close_paren_needed_p)
+	{
+	  if (token == CPP_CLOSE_PAREN)
+	    token = pragma_lex (&x);
+	  else
+	    GCC_BAD ("%<#pragma GCC target (string [,string]...)%> does "
+		     "not have a final %<)%>.");
+	}
+
+      if (token != CPP_EOF)
+	{
+	  error ("#pragma GCC target string... is badly formed");
+	  return;
+	}
+
+      /* put arguments in the order the user typed them.  */
+      args = nreverse (args);
+
+      if (targetm.target_option.pragma_parse (args, NULL_TREE))
+	current_target_pragma = args;
+    }
+}
+
+/* Handle #pragma GCC optimize to set optimization options.  */
+static void
+handle_pragma_optimize (cpp_reader *ARG_UNUSED(dummy))
+{
+  enum cpp_ttype token;
+  tree x;
+  bool close_paren_needed_p = false;
+  tree optimization_previous_node = optimization_current_node;
+
+  if (cfun)
+    {
+      error ("#pragma GCC optimize is not allowed inside functions");
+      return;
+    }
+
+  token = pragma_lex (&x);
+  if (token == CPP_OPEN_PAREN)
+    {
+      close_paren_needed_p = true;
+      token = pragma_lex (&x);
+    }
+
+  if (token != CPP_STRING && token != CPP_NUMBER)
+    {
+      GCC_BAD ("%<#pragma GCC optimize%> is not a string or number");
+      return;
+    }
+
+  /* Strings/numbers are user options.  */
+  else
+    {
+      tree args = NULL_TREE;
+
+      do
+	{
+	  /* Build up the numbers/strings now as a list.  */
+	  if (token != CPP_STRING || TREE_STRING_LENGTH (x) > 0)
+	    args = tree_cons (NULL_TREE, x, args);
+
+	  token = pragma_lex (&x);
+	  while (token == CPP_COMMA)
+	    token = pragma_lex (&x);
+	}
+      while (token == CPP_STRING || token == CPP_NUMBER);
+
+      if (close_paren_needed_p)
+	{
+	  if (token == CPP_CLOSE_PAREN)
+	    token = pragma_lex (&x);
+	  else
+	    GCC_BAD ("%<#pragma GCC optimize (string [,string]...)%> does "
+		     "not have a final %<)%>.");
+	}
+
+      if (token != CPP_EOF)
+	{
+	  error ("#pragma GCC optimize string... is badly formed");
+	  return;
+	}
+
+      /* put arguments in the order the user typed them.  */
+      args = nreverse (args);
+
+      parse_optimize_options (args, false);
+      current_optimize_pragma = chainon (current_optimize_pragma, args);
+      optimization_current_node = build_optimization_node ();
+      c_cpp_builtins_optimize_pragma (parse_in,
+				      optimization_previous_node,
+				      optimization_current_node);
+    }
+}
+
+/* Stack of the #pragma GCC options created with #pragma GCC push_option.  Save
+   both the binary representation of the options and the TREE_LIST of
+   strings that will be added to the function's attribute list.  */
+typedef struct opt_stack GTY(())
+{
+  struct opt_stack *prev;
+  tree target_binary;
+  tree target_strings;
+  tree optimize_binary;
+  tree optimize_strings;
+} opt_stack;
+
+static GTY(()) struct opt_stack * options_stack;
+
+/* Handle #pragma GCC push_options to save the current target and optimization
+   options.  */
+
+static void
+handle_pragma_push_options (cpp_reader *ARG_UNUSED(dummy))
+{
+  enum cpp_ttype token;
+  tree x = 0;
+  opt_stack *p;
+
+  token = pragma_lex (&x);
+  if (token != CPP_EOF)
+    {
+      warning (OPT_Wpragmas, "junk at end of %<#pragma push_options%>");
+      return;
+    }
+
+  p = GGC_NEW (opt_stack);
+  p->prev = options_stack;
+  options_stack = p;
+
+  /* Save optimization and target flags in binary format.  */
+  p->optimize_binary = build_optimization_node ();
+  p->target_binary = build_target_option_node ();
+
+  /* Save optimization and target flags in string list format.  */
+  p->optimize_strings = copy_list (current_optimize_pragma);
+  p->target_strings = copy_list (current_target_pragma);
+}
+
+/* Handle #pragma GCC pop_options to restore the current target and
+   optimization options from a previous push_options.  */
+
+static void
+handle_pragma_pop_options (cpp_reader *ARG_UNUSED(dummy))
+{
+  enum cpp_ttype token;
+  tree x = 0;
+  opt_stack *p;
+
+  token = pragma_lex (&x);
+  if (token != CPP_EOF)
+    {
+      warning (OPT_Wpragmas, "junk at end of %<#pragma pop_options%>");
+      return;
+    }
+
+  if (! options_stack)
+    {
+      warning (OPT_Wpragmas,
+	       "%<#pragma GCC pop_options%> without a corresponding "
+	       "%<#pragma GCC push_options%>");
+      return;
+    }
+
+  p = options_stack;
+  options_stack = p->prev;
+
+  if (p->target_binary != target_option_current_node)
+    {
+      (void) targetm.target_option.pragma_parse (NULL_TREE, p->target_binary);
+      target_option_current_node = p->target_binary;
+    }
+
+  if (p->optimize_binary != optimization_current_node)
+    {
+      tree old_optimize = optimization_current_node;
+      cl_optimization_restore (TREE_OPTIMIZATION (p->optimize_binary));
+      c_cpp_builtins_optimize_pragma (parse_in, old_optimize,
+				      p->optimize_binary);
+      optimization_current_node = p->optimize_binary;
+    }
+
+  current_target_pragma = p->target_strings;
+  current_optimize_pragma = p->optimize_strings;
+}
+
+/* Handle #pragma GCC reset_options to restore the current target and
+   optimization options to the original options used on the command line.  */
+
+static void
+handle_pragma_reset_options (cpp_reader *ARG_UNUSED(dummy))
+{
+  enum cpp_ttype token;
+  tree x = 0;
+  tree new_optimize = optimization_default_node;
+  tree new_target = target_option_default_node;
+
+  token = pragma_lex (&x);
+  if (token != CPP_EOF)
+    {
+      warning (OPT_Wpragmas, "junk at end of %<#pragma reset_options%>");
+      return;
+    }
+
+  if (new_target != target_option_current_node)
+    {
+      (void) targetm.target_option.pragma_parse (NULL_TREE, new_target);
+      target_option_current_node = new_target;
+    }
+
+  if (new_optimize != optimization_current_node)
+    {
+      tree old_optimize = optimization_current_node;
+      cl_optimization_restore (TREE_OPTIMIZATION (new_optimize));
+      c_cpp_builtins_optimize_pragma (parse_in, old_optimize, new_optimize);
+      optimization_current_node = new_optimize;
+    }
+
+  current_target_pragma = NULL_TREE;
+  current_optimize_pragma = NULL_TREE;
+}
+
+/* Print a plain user-specified message.  */
+
+static void
+handle_pragma_message (cpp_reader *ARG_UNUSED(dummy))
+{
+  enum cpp_ttype token;
+  tree x, message = 0;
+
+  token = pragma_lex (&x);
+  if (token == CPP_OPEN_PAREN)
+    {
+      token = pragma_lex (&x);
+      if (token == CPP_STRING)
+        message = x;
+      else
+        GCC_BAD ("expected a string after %<#pragma message%>");
+      if (pragma_lex (&x) != CPP_CLOSE_PAREN)
+        GCC_BAD ("malformed %<#pragma message%>, ignored");
+    }
+  else if (token == CPP_STRING)
+    message = x;
+  else
+    GCC_BAD ("expected a string after %<#pragma message%>");
+
+  gcc_assert (message);
+
+  if (pragma_lex (&x) != CPP_EOF)
+    warning (OPT_Wpragmas, "junk at end of %<#pragma message%>");
+
+  if (TREE_STRING_LENGTH (message) > 1)
+    inform (input_location, "#pragma message: %s", TREE_STRING_POINTER (message));
+}
+
+/* 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;
+
+typedef struct
+{
+  const char *space;
+  const char *name;
+} pragma_ns_name;
+
+DEF_VEC_O (pragma_ns_name);
+DEF_VEC_ALLOC_O (pragma_ns_name, heap);
+
+static VEC(pragma_ns_name, heap) *registered_pp_pragmas;
+
+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 },
+  { "task", PRAGMA_OMP_TASK },
+  { "taskwait", PRAGMA_OMP_TASKWAIT },
+  { "threadprivate", PRAGMA_OMP_THREADPRIVATE }
+};
+
+void
+c_pp_lookup_pragma (unsigned int id, const char **space, const char **name)
+{
+  const int n_omp_pragmas = sizeof (omp_pragmas) / sizeof (*omp_pragmas);
+  int i;
+
+  for (i = 0; i < n_omp_pragmas; ++i)
+    if (omp_pragmas[i].id == id)
+      {
+	*space = "omp";
+	*name = omp_pragmas[i].name;
+	return;
+      }
+
+  if (id >= PRAGMA_FIRST_EXTERNAL
+      && (id < PRAGMA_FIRST_EXTERNAL
+	  + VEC_length (pragma_ns_name, registered_pp_pragmas)))
+    {
+      *space = VEC_index (pragma_ns_name, registered_pp_pragmas,
+			  id - PRAGMA_FIRST_EXTERNAL)->space;
+      *name = VEC_index (pragma_ns_name, registered_pp_pragmas,
+			 id - PRAGMA_FIRST_EXTERNAL)->name;
+      return;
+    }
+
+  gcc_unreachable ();
+}
+
+/* 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;
+
+  if (flag_preprocess_only)
+    {
+      pragma_ns_name ns_name;
+
+      if (!allow_expansion)
+	return;
+
+      ns_name.space = space;
+      ns_name.name = name;
+      VEC_safe_push (pragma_ns_name, heap, registered_pp_pragmas, &ns_name);
+      id = VEC_length (pragma_ns_name, registered_pp_pragmas);
+      id += PRAGMA_FIRST_EXTERNAL - 1;
+    }
+  else
+    {
+      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 (void)
+{
+  if (flag_openmp)
+    {
+      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);
+    }
+
+  if (!flag_preprocess_only)
+    cpp_register_deferred_pragma (parse_in, "GCC", "pch_preprocess",
+				  PRAGMA_GCC_PCH_PREPROCESS, false, false);
+
+#ifdef 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
+#endif
+#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_WEAK
+  c_register_pragma (0, "weak", handle_pragma_weak);
+#endif
+#ifdef HANDLE_PRAGMA_VISIBILITY
+  c_register_pragma ("GCC", "visibility", handle_pragma_visibility);
+#endif
+
+  c_register_pragma ("GCC", "diagnostic", handle_pragma_diagnostic);
+  c_register_pragma ("GCC", "target", handle_pragma_target);
+  c_register_pragma ("GCC", "optimize", handle_pragma_optimize);
+  c_register_pragma ("GCC", "push_options", handle_pragma_push_options);
+  c_register_pragma ("GCC", "pop_options", handle_pragma_pop_options);
+  c_register_pragma ("GCC", "reset_options", handle_pragma_reset_options);
+
+  c_register_pragma_with_expansion (0, "redefine_extname", handle_pragma_redefine_extname);
+  c_register_pragma (0, "extern_prefix", handle_pragma_extern_prefix);
+
+  c_register_pragma_with_expansion (0, "message", handle_pragma_message);
+
+#ifdef REGISTER_TARGET_PRAGMAS
+  REGISTER_TARGET_PRAGMAS ();
+#endif
+}
+
+#include "gt-c-pragma.h"