/* Handle #pragma, system V.4 style. Supports #pragma weak and #pragma pack.
- Copyright (C) 1992, 1997, 1998, 1999, 2000, 2001
+ Copyright (C) 1992, 1997, 1998, 1999, 2000, 2001, 2002
Free Software Foundation, Inc.
This file is part of GCC.
#include "flags.h"
#include "toplev.h"
#include "ggc.h"
-#include "c-lex.h"
+#include "c-common.h"
#include "output.h"
#include "tm_p.h"
-#define BAD(msgid) do { warning (msgid); return; } while (0)
-#define BAD2(msgid, arg) do { warning (msgid, arg); return; } while (0)
+#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
static void handle_pragma_pack PARAMS ((cpp_reader *));
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;
+static int default_alignment;
#define SET_GLOBAL_ALIGNMENT(ALIGN) \
-(default_alignment = maximum_field_alignment = (ALIGN))
+ (default_alignment = maximum_field_alignment = (ALIGN))
static void push_alignment PARAMS ((int, tree));
static void pop_alignment PARAMS ((tree));
int alignment;
tree id;
{
-
if (alignment_stack == NULL
|| alignment_stack->alignment != alignment
|| id != NULL_TREE)
#else /* not HANDLE_PRAGMA_PACK_PUSH_POP */
#define SET_GLOBAL_ALIGNMENT(ALIGN) (maximum_field_alignment = (ALIGN))
#define push_alignment(ID, N) \
- BAD("#pragma pack(push[, id], <n>) is not supported on this target")
+ GCC_BAD("#pragma pack(push[, id], <n>) is not supported on this target")
#define pop_alignment(ID) \
- BAD("#pragma pack(pop[, id], <n>) is not supported on this target")
+ GCC_BAD("#pragma pack(pop[, id], <n>) is not supported on this target")
#endif /* HANDLE_PRAGMA_PACK_PUSH_POP */
/* #pragma pack ()
enum { set, push, pop } action;
if (c_lex (&x) != CPP_OPEN_PAREN)
- BAD ("missing '(' after '#pragma pack' - ignored");
+ GCC_BAD ("missing '(' after '#pragma pack' - ignored");
token = c_lex (&x);
if (token == CPP_CLOSE_PAREN)
align = TREE_INT_CST_LOW (x);
action = set;
if (c_lex (&x) != CPP_CLOSE_PAREN)
- BAD ("malformed '#pragma pack' - ignored");
+ GCC_BAD ("malformed '#pragma pack' - ignored");
}
else if (token == CPP_NAME)
{
-#define BAD_ACTION do { if (action == push) \
- BAD ("malformed '#pragma pack(push[, id], <n>)' - ignored"); \
+#define GCC_BAD_ACTION do { if (action == push) \
+ GCC_BAD ("malformed '#pragma pack(push[, id], <n>)' - ignored"); \
else \
- BAD ("malformed '#pragma pack(pop[, id])' - ignored"); \
+ GCC_BAD ("malformed '#pragma pack(pop[, id])' - ignored"); \
} while (0)
const char *op = IDENTIFIER_POINTER (x);
else if (!strcmp (op, "pop"))
action = pop;
else
- BAD2 ("unknown action '%s' for '#pragma pack' - ignored", op);
+ GCC_BAD2 ("unknown action '%s' for '#pragma pack' - ignored", op);
token = c_lex (&x);
if (token != CPP_COMMA && action == push)
- BAD_ACTION;
+ GCC_BAD_ACTION;
if (token == CPP_COMMA)
{
{
id = x;
if (action == push && c_lex (&x) != CPP_COMMA)
- BAD_ACTION;
+ GCC_BAD_ACTION;
token = c_lex (&x);
}
token = c_lex (&x);
}
else
- BAD_ACTION;
+ GCC_BAD_ACTION;
}
}
if (token != CPP_CLOSE_PAREN)
- BAD_ACTION;
-#undef BAD_ACTION
+ GCC_BAD_ACTION;
+#undef GCC_BAD_ACTION
}
else
- BAD ("malformed '#pragma pack' - ignored");
+ GCC_BAD ("malformed '#pragma pack' - ignored");
if (c_lex (&x) != CPP_EOF)
warning ("junk at end of '#pragma pack'");
align *= BITS_PER_UNIT;
break;
default:
- BAD2 ("alignment must be a small power of two, not %d", align);
+ GCC_BAD2 ("alignment must be a small power of two, not %d", align);
}
switch (action)
#endif /* HANDLE_PRAGMA_PACK */
#ifdef HANDLE_PRAGMA_WEAK
+static void apply_pragma_weak PARAMS ((tree, tree));
static void handle_pragma_weak PARAMS ((cpp_reader *));
+static tree pending_weaks;
+
+static void
+apply_pragma_weak (decl, value)
+ tree decl, 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)
+ && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
+ warning_with_decl (decl, "applying #pragma weak `%s' after first use results in unspecified behavior");
+
+ declare_weak (decl);
+}
+
+void
+maybe_apply_pragma_weak (decl)
+ tree decl;
+{
+ tree *p, t, id;
+
+ /* 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))))
+ id = DECL_ASSEMBLER_NAME (decl);
+ else
+ return;
+
+ 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 (dummy)
cpp_reader *dummy ATTRIBUTE_UNUSED;
{
- tree name, value, x;
+ tree name, value, x, decl;
enum cpp_ttype t;
value = 0;
if (c_lex (&name) != CPP_NAME)
- BAD ("malformed #pragma weak, ignored");
+ GCC_BAD ("malformed #pragma weak, ignored");
t = c_lex (&x);
if (t == CPP_EQ)
{
if (c_lex (&value) != CPP_NAME)
- BAD ("malformed #pragma weak, ignored");
+ GCC_BAD ("malformed #pragma weak, ignored");
t = c_lex (&x);
}
if (t != CPP_EOF)
warning ("junk at end of #pragma weak");
- add_weak (IDENTIFIER_POINTER (name), value ? IDENTIFIER_POINTER (value) : 0);
+ decl = identifier_global_value (name);
+ if (decl && TREE_CODE_CLASS (TREE_CODE (decl)) == 'd')
+ {
+ 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 (decl)
+ tree decl ATTRIBUTE_UNUSED;
+{
+}
+#endif /* HANDLE_PRAGMA_WEAK */
+
+#ifdef HANDLE_PRAGMA_REDEFINE_EXTNAME
+static void handle_pragma_redefine_extname PARAMS ((cpp_reader *));
+
+static tree pending_redefine_extname;
+
+/* #pragma redefined_extname oldname newname */
+static void
+handle_pragma_redefine_extname (dummy)
+ cpp_reader *dummy ATTRIBUTE_UNUSED;
+{
+ tree oldname, newname, decl, x;
+ enum cpp_ttype t;
+
+ if (c_lex (&oldname) != CPP_NAME)
+ {
+ warning ("malformed #pragma redefine_extname, ignored");
+ return;
+ }
+ if (c_lex (&newname) != CPP_NAME)
+ {
+ warning ("malformed #pragma redefine_extname, ignored");
+ return;
+ }
+ t = c_lex (&x);
+ if (t != CPP_EOF)
+ warning ("junk at end of #pragma redefine_extname");
+
+ decl = identifier_global_value (oldname);
+ if (decl && TREE_CODE_CLASS (TREE_CODE (decl)) == 'd')
+ {
+ if (DECL_ASSEMBLER_NAME_SET_P (decl)
+ && DECL_ASSEMBLER_NAME (decl) != newname)
+ warning ("#pragma redefine_extname conflicts with declaration");
+ SET_DECL_ASSEMBLER_NAME (decl, newname);
+ }
+ else
+ pending_redefine_extname
+ = tree_cons (oldname, newname, pending_redefine_extname);
}
#endif
+#ifdef HANDLE_PRAGMA_EXTERN_PREFIX
+static void handle_pragma_extern_prefix PARAMS ((cpp_reader *));
+
+static tree pragma_extern_prefix;
+
+/* #pragma extern_prefix "prefix" */
+static void
+handle_pragma_extern_prefix (dummy)
+ cpp_reader *dummy ATTRIBUTE_UNUSED;
+{
+ tree prefix, x;
+ enum cpp_ttype t;
+
+ if (c_lex (&prefix) != CPP_STRING)
+ {
+ warning ("malformed #pragma extern_prefix, ignored");
+ return;
+ }
+ 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);
+}
+#endif
+
+/* Hook from the front ends to apply the results of one of the preceeding
+ pragmas that rename variables. */
+
+tree
+maybe_apply_renaming_pragma (decl, asmname)
+ tree decl, 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
+ 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] == '*')
+ {
+ const char *oldasmname = IDENTIFIER_POINTER (oldname) + 1;
+ if (asmname && strcmp (TREE_STRING_POINTER (asmname), oldasmname) != 0)
+ warning ("asm declaration conficts with previous rename");
+ asmname = build_string (strlen (oldasmname), oldasmname);
+ }
+
+#ifdef HANDLE_PRAGMA_REDEFINE_EXTNAME
+ {
+ tree *p, 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 (asmname && strcmp (TREE_STRING_POINTER (asmname), newname) != 0)
+ warning ("#pragma redefine_extname conflicts with declaration");
+ *p = TREE_CHAIN (t);
+
+ return build_string (strlen (newname), newname);
+ }
+ }
+#endif
+
+#ifdef HANDLE_PRAGMA_EXTERN_PREFIX
+ if (pragma_extern_prefix && !asmname)
+ {
+ char *x = concat (TREE_STRING_POINTER (pragma_extern_prefix),
+ IDENTIFIER_POINTER (oldname), NULL);
+ asmname = build_string (strlen (x), x);
+ free (x);
+ return asmname;
+ }
+#endif
+
+ return asmname;
+}
+
void
init_pragma ()
{
#endif
#ifdef HANDLE_PRAGMA_WEAK
cpp_register_pragma (parse_in, 0, "weak", handle_pragma_weak);
+ ggc_add_tree_root (&pending_weaks, 1);
+#endif
+#ifdef HANDLE_PRAGMA_REDEFINE_EXTNAME
+ cpp_register_pragma (parse_in, 0, "redefine_extname",
+ handle_pragma_redefine_extname);
+ ggc_add_tree_root (&pending_redefine_extname, 1);
#endif
+#ifdef HANDLE_PRAGMA_EXTERN_PREFIX
+ cpp_register_pragma (parse_in, 0, "extern_prefix",
+ handle_pragma_extern_prefix);
+ ggc_add_tree_root (&pragma_extern_prefix, 1);
+#endif
+
#ifdef REGISTER_TARGET_PRAGMAS
REGISTER_TARGET_PRAGMAS (parse_in);
#endif
OSDN Git Service
