#include "c-common.h"
#include "output.h"
#include "tm_p.h"
+#include "target.h"
#define GCC_BAD(msgid) do { warning (msgid); return; } while (0)
#define GCC_BAD2(msgid, arg) do { warning (msgid, arg); return; } while (0)
#pragma pack (pop)
#pragma pack (pop, ID) */
static void
-handle_pragma_pack (cpp_reader *dummy ATTRIBUTE_UNUSED)
+handle_pragma_pack (cpp_reader * ARG_UNUSED (dummy))
{
tree x, id = 0;
int align = -1;
/* #pragma weak name [= value] */
static void
-handle_pragma_weak (cpp_reader *dummy ATTRIBUTE_UNUSED)
+handle_pragma_weak (cpp_reader * ARG_UNUSED (dummy))
{
tree name, value, x, decl;
enum cpp_ttype t;
}
#else
void
-maybe_apply_pragma_weak (tree decl ATTRIBUTE_UNUSED)
+maybe_apply_pragma_weak (tree ARG_UNUSED (decl))
{
}
#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;
-#ifdef HANDLE_PRAGMA_REDEFINE_EXTNAME
static void handle_pragma_redefine_extname (cpp_reader *);
-/* #pragma redefined_extname oldname newname */
+/* #pragma redefine_extname oldname newname */
static void
-handle_pragma_redefine_extname (cpp_reader *dummy ATTRIBUTE_UNUSED)
+handle_pragma_redefine_extname (cpp_reader * ARG_UNUSED (dummy))
{
tree oldname, newname, decl, x;
enum cpp_ttype t;
if (c_lex (&oldname) != CPP_NAME)
- {
- warning ("malformed #pragma redefine_extname, ignored");
- return;
- }
+ GCC_BAD ("malformed #pragma redefine_extname, ignored");
if (c_lex (&newname) != CPP_NAME)
- {
- warning ("malformed #pragma redefine_extname, ignored");
- return;
- }
+ 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;
+ }
+
decl = identifier_global_value (oldname);
- if (decl && TREE_CODE_CLASS (TREE_CODE (decl)) == 'd')
+ if (decl
+ && (TREE_PUBLIC (decl) || DECL_EXTERNAL (decl))
+ && (TREE_CODE (decl) == FUNCTION_DECL
+ || TREE_CODE (decl) == VAR_DECL)
+ && has_c_linkage (decl))
{
- if (DECL_ASSEMBLER_NAME_SET_P (decl)
- && DECL_ASSEMBLER_NAME (decl) != newname)
- warning ("#pragma redefine_extname conflicts with declaration");
- change_decl_assembler_name (decl, newname);
+ if (DECL_ASSEMBLER_NAME_SET_P (decl))
+ {
+ const char *name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
+ name = targetm.strip_name_encoding (name);
+
+ if (strcmp (name, IDENTIFIER_POINTER (newname)))
+ warning ("#pragma redefine_extname ignored due to conflict with "
+ "previous rename");
+ }
+ else
+ change_decl_assembler_name (decl, newname);
}
else
- add_to_renaming_pragma_list(oldname, newname);
+ /* We have to add this to the rename list even if there's already
+ a global value that doesn't meet the above criteria, because in
+ C++ "struct foo {...};" puts "foo" in the current namespace but
+ does *not* conflict with a subsequent declaration of a function
+ or variable foo. See g++.dg/other/pragma-re-2.C. */
+ add_to_renaming_pragma_list (oldname, newname);
}
-#endif
+/* 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;
-#ifdef HANDLE_PRAGMA_EXTERN_PREFIX
-static void handle_pragma_extern_prefix (cpp_reader *);
-
/* #pragma extern_prefix "prefix" */
static void
-handle_pragma_extern_prefix (cpp_reader *dummy ATTRIBUTE_UNUSED)
+handle_pragma_extern_prefix (cpp_reader * ARG_UNUSED (dummy))
{
tree prefix, x;
enum cpp_ttype t;
if (c_lex (&prefix) != CPP_STRING)
- {
- warning ("malformed #pragma extern_prefix, ignored");
- return;
- }
+ GCC_BAD ("malformed #pragma extern_prefix, ignored");
t = c_lex (&x);
if (t != CPP_EOF)
warning ("junk at end of #pragma extern_prefix");
- /* Note that the length includes the null terminator. */
- pragma_extern_prefix = (TREE_STRING_LENGTH (prefix) > 1 ? prefix : NULL);
+ 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");
}
-#endif
/* 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 oldname;
-
- /* Copied from the check in set_decl_assembler_name. */
- if (TREE_CODE (decl) == FUNCTION_DECL
- || (TREE_CODE (decl) == VAR_DECL
- && (TREE_STATIC (decl)
- || DECL_EXTERNAL (decl)
- || TREE_PUBLIC (decl))))
- oldname = DECL_ASSEMBLER_NAME (decl);
- else
+ tree *p, t;
+
+ /* The renaming pragmas are only applied to declarations with
+ external linkage. */
+ if ((TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
+ || (!TREE_PUBLIC (decl) && !DECL_EXTERNAL (decl))
+ || !has_c_linkage (decl))
return asmname;
- /* If the name begins with a *, that's a sign of an asmname attached to
- a previous declaration. */
- if (IDENTIFIER_POINTER (oldname)[0] == '*')
+ /* 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 *oldasmname = IDENTIFIER_POINTER (oldname) + 1;
- if (asmname && strcmp (TREE_STRING_POINTER (asmname), oldasmname) != 0)
- warning ("asm declaration conflicts with previous rename");
- asmname = build_string (strlen (oldasmname), oldasmname);
+ 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;
}
- {
- tree *p, t;
+ /* 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);
- for (p = &pending_redefine_extname; (t = *p) ; p = &TREE_CHAIN (t))
- if (oldname == TREE_PURPOSE (t))
- {
- const char *newname = IDENTIFIER_POINTER (TREE_VALUE (t));
+ /* If 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;
+ }
- if (asmname && strcmp (TREE_STRING_POINTER (asmname), newname) != 0)
- warning ("#pragma redefine_extname conflicts with declaration");
- *p = TREE_CHAIN (t);
+ /* Otherwise we use what we've got; #pragma extern_prefix is
+ silently ignored. */
+ return build_string (IDENTIFIER_LENGTH (newname),
+ IDENTIFIER_POINTER (newname));
+ }
- return build_string (strlen (newname), newname);
- }
- }
+ /* If we've got an asmname, #pragma extern_prefix is silently ignored. */
+ if (asmname)
+ return asmname;
-#ifdef HANDLE_PRAGMA_EXTERN_PREFIX
- if (pragma_extern_prefix && !asmname)
+ /* If #pragma extern_prefix is in effect, apply it. */
+ if (pragma_extern_prefix)
{
- char *x = concat (TREE_STRING_POINTER (pragma_extern_prefix),
- IDENTIFIER_POINTER (oldname), NULL);
- asmname = build_string (strlen (x), x);
- free (x);
- return asmname;
+ 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);
}
-#endif
- return asmname;
+ /* Nada. */
+ return 0;
+}
+
+
+#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
+ {
+ 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 wrapper for pragma registration to avoid dragging
cpplib.h in almost everywhere. */
void
#ifdef HANDLE_PRAGMA_WEAK
c_register_pragma (0, "weak", handle_pragma_weak);
#endif
-#ifdef HANDLE_PRAGMA_REDEFINE_EXTNAME
- c_register_pragma (0, "redefine_extname", handle_pragma_redefine_extname);
+#ifdef HANDLE_PRAGMA_VISIBILITY
+ c_register_pragma ("GCC", "visibility", handle_pragma_visibility);
#endif
-#ifdef HANDLE_PRAGMA_EXTERN_PREFIX
+
+ c_register_pragma (0, "redefine_extname", handle_pragma_redefine_extname);
c_register_pragma (0, "extern_prefix", handle_pragma_extern_prefix);
-#endif
+
+ c_register_pragma ("GCC", "pch_preprocess", c_common_pch_pragma);
#ifdef REGISTER_TARGET_PRAGMAS
REGISTER_TARGET_PRAGMAS ();
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