/* 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 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
. */
#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() in effect when the first
#pragma pack(push,) 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() 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], ) is not supported on this target")
#define pop_alignment(ID) \
GCC_BAD ("#pragma pack(pop[, id], ) 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][, ])%> - 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 *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
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 = 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 = *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");
}
/* 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 (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
#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_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"