X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Fc-pragma.c;h=cc1dd280359a59c7e3855c5b3857429426bf4c3b;hb=ffca001431383db73c1c827b614283aaf6a9c832;hp=8503f3cacca41362ea1cb52f1b6e9b13f6220964;hpb=c9906f1e70916bbd20e66e9d92618dafc8dc67c8;p=pf3gnuchains%2Fgcc-fork.git diff --git a/gcc/c-pragma.c b/gcc/c-pragma.c index 8503f3cacca..cc1dd280359 100644 --- a/gcc/c-pragma.c +++ b/gcc/c-pragma.c @@ -1,126 +1,101 @@ /* 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-lex.h" +#include "c-common.h" +#include "output.h" #include "tm_p.h" +#include "target.h" -#if USE_CPPLIB -extern cpp_reader parse_in; -#else -struct pragma_entry; -static struct pragma_entry *pragmas; - -void cpp_register_pragma PARAMS ((cpp_reader *, const char *, const char *, - void (*) PARAMS ((cpp_reader *)) )); -void cpp_register_pragma_space PARAMS ((cpp_reader *, const char *)); -#endif - -#define BAD(msgid) do { warning (msgid); return; } while (0) -#define BAD2(msgid, arg) do { warning (msgid, arg); return; } while (0) - -#ifdef HANDLE_PRAGMA_PACK -static void handle_pragma_pack PARAMS ((cpp_reader *)); +#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() if effect when the first - #pragma push(pack,) is encountered, this stores the the value of +#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) \ -(default_alignment = maximum_field_alignment = (ALIGN)) + 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 PARAMS ((int, tree)); -static void pop_alignment PARAMS ((tree)); -static void mark_align_stack PARAMS ((void *)); +static void push_alignment (int, tree); +static void pop_alignment (tree); /* Push an alignment value onto the stack. */ static void -push_alignment (alignment, id) - int alignment; - tree id; +push_alignment (int alignment, tree id) { - - if (alignment_stack == NULL - || alignment_stack->alignment != alignment - || id != NULL_TREE) - { - align_stack * entry; + align_stack * entry; - entry = (align_stack *) xmalloc (sizeof (* entry)); + entry = ggc_alloc (sizeof (* 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() 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->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; - } - else - alignment_stack->num_pushes ++; + maximum_field_alignment = alignment; } /* Undo a push of an alignment onto the stack. */ static void -pop_alignment (id) - tree id; +pop_alignment (tree id) { align_stack * entry; if (alignment_stack == NULL) - { - warning ("\ -#pragma pack (pop) encountered without matching #pragma pack (push, )" - ); - return; - } + 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. */ @@ -129,132 +104,128 @@ pop_alignment (id) 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, )" +#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; + maximum_field_alignment = entry ? entry->alignment : default_alignment; - free (alignment_stack); - - alignment_stack = entry; - } -} - -static void -mark_align_stack (p) - void *p; -{ - align_stack *a = *(align_stack **) p; - - while (a) - { - ggc_mark_tree (a->id); - a = a->prev; - } + alignment_stack = entry; } #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], ) is not supported on this target") + GCC_BAD ("#pragma pack(push[, id], ) is not supported on this target") #define pop_alignment(ID) \ - BAD("#pragma pack(pop[, id], ) is not supported on this target") + 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 (dummy) - cpp_reader *dummy ATTRIBUTE_UNUSED; +handle_pragma_pack (cpp_reader * ARG_UNUSED (dummy)) { tree x, id = 0; - int align; + int align = -1; enum cpp_ttype token; 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) { action = set; - align = 0; + 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) - BAD ("malformed '#pragma pack' - ignored"); + 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 - BAD2 ("unknown action '%s' for '#pragma pack' - ignored", op); - - if (c_lex (&x) != CPP_COMMA) - BAD2 ("malformed '#pragma pack(%s[, id], )' - ignored", op); + GCC_BAD2 ("unknown action %qs for %<#pragma pack%> - ignored", op); - token = c_lex (&x); - if (token == CPP_NAME) + while ((token = c_lex (&x)) == CPP_COMMA) { - id = x; - if (c_lex (&x) != CPP_COMMA) - BAD2 ("malformed '#pragma pack(%s[, id], )' - ignored", op); token = c_lex (&x); + if (token == CPP_NAME && id == 0) + { + id = x; + } + else if (token == CPP_NUMBER && action == push && align == -1) + { + align = TREE_INT_CST_LOW (x); + if (align == -1) + action = set; + } + else + GCC_BAD_ACTION; } - if (token == CPP_NUMBER) - align = TREE_INT_CST_LOW (x); - else - BAD2 ("malformed '#pragma pack(%s[, id], )' - ignored", op); - - if (c_lex (&x) != CPP_CLOSE_PAREN) - BAD ("malformed '#pragma pack' - ignored"); + if (token != CPP_CLOSE_PAREN) + 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'"); - - switch (align) - { - case 0: - case 1: - case 2: - case 4: - case 8: - case 16: - align *= BITS_PER_UNIT; - break; - default: - BAD2 ("alignment must be a small power of two, not %d", align); - } + 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); + } switch (action) { @@ -265,193 +236,471 @@ handle_pragma_pack (dummy) } #endif /* HANDLE_PRAGMA_PACK */ +static GTY(()) tree pending_weaks; + #ifdef HANDLE_PRAGMA_WEAK -static void handle_pragma_weak PARAMS ((cpp_reader *)); +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; + } +} + +/* 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 (dummy) - cpp_reader *dummy ATTRIBUTE_UNUSED; +handle_pragma_weak (cpp_reader * ARG_UNUSED (dummy)) { - 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 && DECL_P (decl)) + { + apply_pragma_weak (decl, value); + if (value) + assemble_alias (decl, value); + } + else + pending_weaks = tree_cons (name, value, pending_weaks); } -#endif - -#if !USE_CPPLIB -/* Glue version of cpplib's pragma registration and dispatch system. */ -struct pragma_entry +#else +void +maybe_apply_pragma_weak (tree ARG_UNUSED (decl)) { - struct pragma_entry *next; - const char *name; - size_t len; - int isnspace; - union { - void (*handler) PARAMS ((cpp_reader *)); - struct pragma_entry *space; - } u; -}; +} void -cpp_register_pragma_space (pfile, space) - cpp_reader *pfile ATTRIBUTE_UNUSED; - const char *space; +maybe_apply_pending_pragma_weaks (void) { - struct pragma_entry *new; - const struct pragma_entry *p = pragmas; - size_t len = strlen (space); +} +#endif /* HANDLE_PRAGMA_WEAK */ - while (p) - { - if (p->isnspace && p->len == len && !memcmp (p->name, space, len)) - return; - p = p->next; - } +/* 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. - new = (struct pragma_entry *) xmalloc (sizeof (struct pragma_entry)); - new->name = space; - new->len = len; - new->isnspace = 1; - new->u.space = 0; + Corner cases of these features and their interaction: - new->next = pragmas; - pragmas = new; -} + 1) Both pragmas silently apply only to declarations with external + linkage (that is, TREE_PUBLIC || DECL_EXTERNAL). Asm labels + do not have this restriction. -void -cpp_register_pragma (pfile, space, name, handler) - cpp_reader *pfile ATTRIBUTE_UNUSED; - const char *space; - const char *name; - void (*handler) PARAMS ((cpp_reader *)); + 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)) { - struct pragma_entry **x, *new; - size_t len; + 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"); - x = &pragmas; - if (space) + if (!flag_mudflap && !targetm.handle_pragma_redefine_extname) { - struct pragma_entry *p = pragmas; - len = strlen (space); - while (p) - { - if (p->isnspace && p->len == len && !memcmp (p->name, space, len)) - { - x = &p->u.space; - goto found; - } - p = p->next; - } - abort (); + if (warn_unknown_pragmas > in_system_header) + warning ("#pragma redefine_extname not supported on this target"); + return; } - found: - new = (struct pragma_entry *) xmalloc (sizeof (struct pragma_entry)); - new->name = name; - new->len = strlen (name); - new->isnspace = 0; - new->u.handler = handler; + 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); - new->next = *x; - *x = new; + 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 + /* 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); } -/* Called from process_directive() for #pragma lines. */ +/* This is called from here and from ia64.c. */ void -dispatch_pragma () +add_to_renaming_pragma_list (tree oldname, tree newname) { - enum cpp_ttype t; - tree x; - const struct pragma_entry *p; - const char *name, *space = 0; - size_t len; + 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; - p = pragmas; +/* #pragma extern_prefix "prefix" */ +static void +handle_pragma_extern_prefix (cpp_reader * ARG_UNUSED (dummy)) +{ + tree prefix, x; + enum cpp_ttype t; - new_space: + if (c_lex (&prefix) != CPP_STRING) + GCC_BAD ("malformed #pragma extern_prefix, ignored"); t = c_lex (&x); - if (t == CPP_EOF) - return; + if (t != CPP_EOF) + warning ("junk at end of #pragma extern_prefix"); - if (t != CPP_NAME) + 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"); +} + +/* 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)) { - warning ("malformed #pragma directive"); - return; + 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; } - name = IDENTIFIER_POINTER (x); - len = IDENTIFIER_LENGTH (x); - while (p) + /* 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) { - if (strlen (p->name) == len && !memcmp (p->name, name, len)) - { - if (p->isnspace) - { - space = p->name; - p = p->u.space; - goto new_space; - } - else - { - (*p->u.handler) (0); - return; - } - } - p = p->next; + 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); } - /* Issue a warning message if we have been asked to do so. Ignore - unknown pragmas in system headers unless an explicit - -Wunknown-pragmas has been given. */ - if (warn_unknown_pragmas > in_system_header) + /* 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) { - if (space) - warning ("ignoring #pragma %s %s", space, 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 - warning ("ignoring #pragma %s", name); + { + 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 *)) { - cpp_reader *pfile ATTRIBUTE_UNUSED; -#if !USE_CPPLIB - pfile = 0; -#else - pfile = &parse_in; -#endif + 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 - cpp_register_pragma (pfile, 0, "pack", 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 - cpp_register_pragma (pfile, 0, "weak", handle_pragma_weak); + c_register_pragma (0, "weak", handle_pragma_weak); #endif -#ifdef REGISTER_TARGET_PRAGMAS - REGISTER_TARGET_PRAGMAS (pfile); +#ifdef HANDLE_PRAGMA_VISIBILITY + c_register_pragma ("GCC", "visibility", handle_pragma_visibility); #endif -#ifdef HANDLE_PRAGMA_PACK_PUSH_POP - ggc_add_root (&alignment_stack, 1, sizeof(alignment_stack), - mark_align_stack); + 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"