+#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%>");
+}
+