/* Handle #pragma, system V.4 style. Supports #pragma weak and #pragma pack.
- Copyright (C) 1992, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
+ Copyright (C) 1992, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
+ Free Software Foundation, Inc.
-This file is part of GNU CC.
+This file is part of GCC.
-GNU CC 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 version.
+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
+version.
-GNU CC 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.
+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 GNU CC; 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 COPYING. If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA. */
#include "config.h"
#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
#include "rtl.h"
#include "tree.h"
#include "function.h"
-#include "defaults.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 "target.h"
-#ifdef HANDLE_GENERIC_PRAGMAS
+#define GCC_BAD(msgid) do { warning (msgid); return; } while (0)
+#define GCC_BAD2(msgid, arg) do { warning (msgid, arg); return; } while (0)
-#ifdef HANDLE_PRAGMA_PACK_PUSH_POP
-typedef struct align_stack
+typedef struct align_stack GTY(())
{
int alignment;
- unsigned int num_pushes;
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 *);
-/* If we have a "global" #pragma pack(<n>) if effect when the first
- #pragma push(pack,<n>) is encountered, this stores the the value of
+#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;
+ 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 int push_alignment PARAMS ((int, tree));
-static int pop_alignment PARAMS ((tree));
-#ifdef HANDLE_PRAGMA_PACK_PUSH_POP
-static void mark_align_stack PARAMS ((void *));
-#endif
+static void push_alignment (int, tree);
+static void pop_alignment (tree);
/* Push an alignment value onto the stack. */
-static int
-push_alignment (alignment, id)
- int alignment;
- tree id;
+static void
+push_alignment (int alignment, tree id)
{
- switch (alignment)
- {
- case 0:
- case 1:
- case 2:
- case 4:
- case 8:
- case 16:
- break;
- default:
- warning ("\
-Alignment must be a small power of two, not %d, in #pragma pack",
- alignment);
- return 0;
- }
-
- if (alignment_stack == NULL
- || alignment_stack->alignment != alignment
- || id != NULL_TREE)
- {
- align_stack * entry;
-
- entry = (align_stack *) xmalloc (sizeof (* entry));
+ align_stack * 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;
+ entry = ggc_alloc (sizeof (* entry));
- maximum_field_alignment = alignment * 8;
- }
- else
- alignment_stack->num_pushes ++;
+ 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;
- return 1;
+ maximum_field_alignment = alignment;
}
/* Undo a push of an alignment onto the stack. */
-static int
-pop_alignment (id)
- tree id;
+static void
+pop_alignment (tree id)
{
align_stack * entry;
if (alignment_stack == NULL)
- {
- warning ("\
-#pragma pack (pop) encountered without matching #pragma pack (push, <n>)"
- );
- return 0;
- }
+ 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>)"
+#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;
+ entry = alignment_stack->prev;
- if (entry == NULL)
- maximum_field_alignment = default_alignment;
- else
- maximum_field_alignment = entry->alignment * 8;
-
- free (alignment_stack);
+ maximum_field_alignment = entry ? entry->alignment : default_alignment;
- alignment_stack = entry;
- }
-
- return 1;
+ 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 */
-\f
-/* Handle one token of a pragma directive. TOKEN is the current token, and
- STRING is its printable form. Some front ends do not support generating
- tokens, and will only pass in a STRING. Also some front ends will reuse
- the buffer containing STRING, so it must be copied to a local buffer if
- it needs to be preserved.
-
- If STRING is non-NULL, then the return value will be ignored, and there
- will be futher calls to handle_pragma_token in order to handle the rest of
- the line containing the #pragma directive. If STRING is NULL, the entire
- line has now been presented to handle_pragma_token and the return value
- should be zero if the pragma flawed in some way, or if the pragma was not
- recognised, and non-zero if it was successfully handled. */
-
-int
-handle_pragma_token (string, token)
- const char *string;
- tree token;
+
+/* #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))
{
- static enum pragma_state state = ps_start;
- static enum pragma_state type;
-#ifdef HANDLE_PRAGMA_WEAK
- static char *name;
- static char *value;
-#endif
-#if defined(HANDLE_PRAGMA_PACK) || defined(HANDLE_PRAGMA_PACK_PUSH_POP)
- static unsigned int align;
-#endif
- static tree id;
+ tree x, id = 0;
+ int align = -1;
+ enum cpp_ttype token;
+ enum { set, push, pop } action;
- /* If we have reached the end of the #pragma directive then
- determine what value we should return. */
-
- if (string == NULL)
+ if (c_lex (&x) != CPP_OPEN_PAREN)
+ GCC_BAD ("missing %<(%> after %<#pragma pack%> - ignored");
+
+ token = c_lex (&x);
+ if (token == CPP_CLOSE_PAREN)
{
- int ret_val = 0;
+ action = set;
+ align = initial_max_fld_align;
+ }
+ else if (token == CPP_NUMBER)
+ {
+ align = TREE_INT_CST_LOW (x);
+ action = set;
+ if (c_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);
- switch (type)
+ while ((token = c_lex (&x)) == CPP_COMMA)
{
- default:
- abort ();
- break;
-
- case ps_done:
- /* The pragma was not recognised. */
- break;
-
-#ifdef HANDLE_PRAGMA_PACK
- case ps_pack:
- if (state == ps_right)
+ token = c_lex (&x);
+ if (token == CPP_NAME && id == 0)
{
- maximum_field_alignment = align * 8;
-#ifdef HANDLE_PRAGMA_PACK_PUSH_POP
- default_alignment = maximum_field_alignment;
-#endif
- ret_val = 1;
+ id = x;
}
- else
- warning ("malformed `#pragma pack'");
- break;
-#endif /* HANDLE_PRAGMA_PACK */
-
-#ifdef HANDLE_PRAGMA_PACK_PUSH_POP
- case ps_push:
- if (state == ps_right)
- ret_val = push_alignment (align, id);
- else
- warning ("malformed '#pragma pack(push[,id],<n>)'");
- break;
-
- case ps_pop:
- if (state == ps_right)
- ret_val = pop_alignment (id);
- else
- warning ("malformed '#pragma pack(pop[,id])'");
- break;
-#endif /* HANDLE_PRAGMA_PACK_PUSH_POP */
-
-#ifdef HANDLE_PRAGMA_WEAK
- case ps_weak:
- if (HANDLE_PRAGMA_WEAK)
+ else if (token == CPP_NUMBER && action == push && align == -1)
{
- if (state == ps_name)
- ret_val = add_weak (name, NULL);
- else if (state == ps_value)
- ret_val = add_weak (name, value);
- else
- warning ("malformed `#pragma weak'");
+ align = TREE_INT_CST_LOW (x);
+ if (align == -1)
+ action = set;
}
else
- ret_val = 1; /* Ignore the pragma. */
- break;
-#endif /* HANDLE_PRAGMA_WEAK */
-
- case ps_poison:
- ret_val = 1;
- break;
+ GCC_BAD_ACTION;
}
- type = state = ps_start;
- id = NULL_TREE;
-
- return ret_val;
+ if (token != CPP_CLOSE_PAREN)
+ GCC_BAD_ACTION;
+#undef GCC_BAD_ACTION
}
+ else
+ GCC_BAD ("malformed %<#pragma pack%> - ignored");
+
+ if (c_lex (&x) != CPP_EOF)
+ warning ("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);
+ }
- /* If we have been given a token, but it is not an identifier,
- or a small constant, then something has gone wrong. */
- if (token)
+ switch (action)
{
- switch (TREE_CODE (token))
- {
- case IDENTIFIER_NODE:
- break;
-
- case INTEGER_CST:
- if (TREE_INT_CST_HIGH (token) != 0)
- return 0;
- break;
-
- default:
- return 0;
- }
+ case set: SET_GLOBAL_ALIGNMENT (align); break;
+ case push: push_alignment (align, id); break;
+ case pop: pop_alignment (id); break;
}
-
- switch (state)
- {
- case ps_start:
- type = state = ps_done;
-#ifdef HANDLE_PRAGMA_PACK
- if (strcmp (string, "pack") == 0)
- type = state = ps_pack;
-#endif
-#ifdef HANDLE_PRAGMA_WEAK
- if (strcmp (string, "weak") == 0)
- type = state = ps_weak;
-#endif
- if (strcmp (string, "poison") == 0)
- type = state = ps_poison;
- break;
+}
+#endif /* HANDLE_PRAGMA_PACK */
+
+static GTY(()) tree pending_weaks;
#ifdef HANDLE_PRAGMA_WEAK
- case ps_weak:
- name = xstrdup (string);
- state = ps_name;
- break;
-
- case ps_name:
- state = (strcmp (string, "=") ? ps_bad : ps_equals);
- break;
-
- case ps_equals:
- value = xstrdup (string);
- state = ps_value;
- break;
-
- case ps_value:
- state = ps_bad;
- break;
+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 ("%Japplying #pragma weak %qD after first use results "
+ "in unspecified behavior", decl, 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;
+ }
+}
+
+/* #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 (c_lex (&name) != CPP_NAME)
+ GCC_BAD ("malformed #pragma weak, ignored");
+ t = c_lex (&x);
+ if (t == CPP_EQ)
+ {
+ if (c_lex (&value) != CPP_NAME)
+ GCC_BAD ("malformed #pragma weak, ignored");
+ t = c_lex (&x);
+ }
+ if (t != CPP_EOF)
+ warning ("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))
+{
+}
#endif /* HANDLE_PRAGMA_WEAK */
-
-#ifdef HANDLE_PRAGMA_PACK
- case ps_pack:
- state = (strcmp (string, "(") ? ps_bad : ps_left);
- break;
- case ps_left:
+/* 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.
- if (token == NULL_TREE)
- {
- /* #pragma pack () resets packing rules to their
- defaults. */
- if (strcmp (string, ")") == 0)
- {
- align = 0;
- state = ps_right;
- }
- else
- state = ps_bad;
- }
- else if (TREE_CODE (token) == INTEGER_CST)
- goto handle_align;
+ Corner cases of these features and their interaction:
-#ifdef HANDLE_PRAGMA_PACK_PUSH_POP
- else if (TREE_CODE (token) == IDENTIFIER_NODE)
- {
- if (strcmp (string, "push") == 0)
- type = state = ps_push;
- else if (strcmp (string, "pop") == 0)
- type = state = ps_pop;
- else
- state = ps_bad;
- }
-#endif
- else
- state = ps_bad;
- break;
+ 1) Both pragmas silently apply only to declarations with external
+ linkage (that is, TREE_PUBLIC || DECL_EXTERNAL). Asm labels
+ do not have this restriction.
- handle_align:
- switch (tree_log2 (token))
- {
- case 0:
- case 1:
- case 2:
- case 3:
- case 4:
- state = ps_align;
- align = 1 << tree_log2 (token);
- break;
-
- default:
- state = ps_bad;
- break;
- }
- break;
+ 2) In C++, both #pragmas silently apply only to extern "C" declarations.
+ Asm labels do not have this restriction.
- case ps_align:
- state = (strcmp (string, ")") ? ps_bad : ps_right);
- break;
+ 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.
- case ps_right:
- state = ps_bad;
- break;
-#endif /* HANDLE_PRAGMA_PACK */
+ 4) The "source name" for #pragma redefine_extname is the DECL_NAME,
+ *not* the DECL_ASSEMBLER_NAME.
-#ifdef HANDLE_PRAGMA_PACK_PUSH_POP
- case ps_push:
- state = (strcmp (string, ",") ? ps_bad : ps_pushcomma);
- break;
+ 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.
- case ps_pushid:
- state = (strcmp (string, ",") ? ps_bad : ps_pushcomma2);
- break;
+ 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.) */
- case ps_pushcomma:
- if (token && TREE_CODE (token) == IDENTIFIER_NODE)
- {
- id = token;
- state = ps_pushid;
- break;
- }
+static GTY(()) tree pending_redefine_extname;
- /* else fall through */
- case ps_pushcomma2:
- if (token && TREE_CODE (token) == INTEGER_CST)
- goto handle_align;
- else
- state = ps_bad;
- break;
+static void handle_pragma_redefine_extname (cpp_reader *);
- case ps_pop:
- if (strcmp (string, ",") == 0)
- state = ps_popcomma;
- else
- state = (strcmp (string, ")") ? ps_bad : ps_right);
- break;
+/* #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 (c_lex (&oldname) != CPP_NAME)
+ GCC_BAD ("malformed #pragma redefine_extname, ignored");
+ if (c_lex (&newname) != CPP_NAME)
+ GCC_BAD ("malformed #pragma redefine_extname, ignored");
+ t = c_lex (&x);
+ if (t != CPP_EOF)
+ warning ("junk at end of #pragma redefine_extname");
+
+ if (!flag_mudflap && !targetm.handle_pragma_redefine_extname)
+ {
+ if (warn_unknown_pragmas > in_system_header)
+ warning ("#pragma redefine_extname not supported on this target");
+ return;
+ }
- case ps_popcomma:
- if (token && TREE_CODE (token) == IDENTIFIER_NODE)
+ 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))
{
- id = token;
- state = ps_align;
+ const char *name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
+ name = targetm.strip_name_encoding (name);
+
+ if (strcmp (name, IDENTIFIER_POINTER (newname)))
+ warning ("#pragma redefine_extname ignored due to conflict with "
+ "previous rename");
}
else
- state = ps_bad;
- break;
-#endif /* HANDLE_PRAGMA_PACK_PUSH_POP */
+ 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);
+}
- case ps_poison:
- if (token && TREE_CODE (token) != IDENTIFIER_NODE)
- state = ps_bad;
- break;
+/* 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 ("#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 (c_lex (&prefix) != CPP_STRING)
+ GCC_BAD ("malformed #pragma extern_prefix, ignored");
+ t = c_lex (&x);
+ if (t != CPP_EOF)
+ warning ("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 ("#pragma extern_prefix not supported on this target");
+}
- case ps_bad:
- case ps_done:
- break;
+/* Hook from the front ends to apply the results of one of the preceding
+ pragmas that rename variables. */
- default:
- abort ();
+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 ("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 ("#pragma redefine_extname ignored due to "
+ "conflict with previous rename");
+
+ *p = TREE_CHAIN (t);
+ break;
+ }
+ return 0;
}
- return 1;
+ /* 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 ("#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;
}
-#endif /* HANDLE_GENERIC_PRAGMAS */
-\f
-#ifdef HANDLE_PRAGMA_PACK_PUSH_POP
-static void
-mark_align_stack (p)
- void *p;
-{
- align_stack *a = *(align_stack **) p;
- while (a)
+
+#ifdef HANDLE_PRAGMA_VISIBILITY
+static void handle_pragma_visibility (cpp_reader *);
+
+/* 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 */
+ static int visstack [16], visidx;
+ tree x;
+ enum cpp_ttype token;
+ enum { bad, push, pop } action = bad;
+
+ token = c_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
{
- ggc_mark_tree (a->id);
- a = a->prev;
+ if (pop == action)
+ {
+ if (!visidx)
+ {
+ GCC_BAD ("No matching push for %<#pragma GCC visibility pop%>");
+ }
+ else
+ {
+ default_visibility = visstack[--visidx];
+ visibility_options.inpragma = (visidx>0);
+ }
+ }
+ else
+ {
+ if (c_lex (&x) != CPP_OPEN_PAREN)
+ GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
+ token = c_lex (&x);
+ if (token != CPP_NAME)
+ {
+ GCC_BAD ("malformed #pragma GCC visibility push");
+ }
+ else if (visidx >= 16)
+ {
+ GCC_BAD ("No more than sixteen #pragma GCC visibility pushes allowed at once");
+ }
+ else
+ {
+ const char *str = IDENTIFIER_POINTER (x);
+ visstack[visidx++] = 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;
+ }
+ if (c_lex (&x) != CPP_CLOSE_PAREN)
+ GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
+ }
}
+ if (c_lex (&x) != CPP_EOF)
+ warning ("junk at end of %<#pragma GCC visibility%>");
}
+
#endif
+/* Front-end wrappers for pragma registration to avoid dragging
+ cpplib.h in almost everywhere. */
void
-init_pragma ()
+c_register_pragma (const char *space, const char *name,
+ void (*handler) (struct cpp_reader *))
{
-#ifdef HANDLE_PRAGMA_PACK_PUSH_POP
- ggc_add_root (&alignment_stack, 1, sizeof(alignment_stack),
- mark_align_stack);
+ cpp_register_pragma (parse_in, space, name, handler, 0);
+}
+
+void
+c_register_pragma_with_expansion (const char *space, const char *name,
+ void (*handler) (struct cpp_reader *))
+{
+ cpp_register_pragma (parse_in, space, name, handler, 1);
+}
+
+/* Set up front-end pragmas. */
+void
+init_pragma (void)
+{
+#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_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 (0, "redefine_extname", handle_pragma_redefine_extname);
+ c_register_pragma (0, "extern_prefix", handle_pragma_extern_prefix);
+
+ c_register_pragma ("GCC", "pch_preprocess", c_common_pch_pragma);
+
+#ifdef REGISTER_TARGET_PRAGMAS
+ REGISTER_TARGET_PRAGMAS ();
#endif
}
+
+#include "gt-c-pragma.h"
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