X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Fc-pragma.c;h=ba59fb3a589a1ae67ed7f65381590f66932c5aec;hb=98af4b887b100ba1c82d335364bc32ba65b959cb;hp=5055b3f23bc8a05d1170e3f67420eb620cb4f717;hpb=6a9a24a56ea37fe9f52f24b310af7335dfc2621d;p=pf3gnuchains%2Fgcc-fork.git diff --git a/gcc/c-pragma.c b/gcc/c-pragma.c index 5055b3f23bc..ba59fb3a589 100644 --- a/gcc/c-pragma.c +++ b/gcc/c-pragma.c @@ -1,47 +1,45 @@ /* Handle #pragma, system V.4 style. Supports #pragma weak and #pragma pack. - Copyright (C) 1992, 97-99, 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-common.h" +#include "output.h" +#include "tm_p.h" +#include "target.h" -#ifdef HANDLE_GENERIC_PRAGMAS +#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 -/* When structure field packing is in effect, this variable is the - number of bits to use as the maximum alignment. When packing is not - in effect, this is zero. */ - -extern int maximum_field_alignment; -#endif - - -#ifdef HANDLE_PRAGMA_PACK_PUSH_POP -typedef struct align_stack +typedef struct align_stack GTY(()) { int alignment; unsigned int num_pushes; @@ -49,47 +47,35 @@ typedef struct align_stack struct align_stack * prev; } align_stack; -static struct align_stack * alignment_stack = NULL; +static GTY(()) struct align_stack * alignment_stack; -/* 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 +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; + maximum_field_alignment. Value is in bits. */ +static int default_alignment; +#define SET_GLOBAL_ALIGNMENT(ALIGN) \ + (default_alignment = maximum_field_alignment = (ALIGN)) -static int push_alignment PARAMS ((int, tree)); -static int pop_alignment PARAMS ((tree)); +static void push_alignment (int, tree); +static void pop_alignment (tree); /* Push an alignment value onto the stack. */ -static int -push_alignment (alignment, id) - int alignment; - tree id; +static void +push_alignment (int alignment, tree id) { - switch (alignment) - { - case 0: - case 1: - case 2: - case 4: - case 8: - case 16: - break; - default: - warning ("\ -Alignment must be a small power of two, not %d, in #pragma pack", - alignment); - return 0; - } - if (alignment_stack == NULL || alignment_stack->alignment != alignment || id != NULL_TREE) { align_stack * entry; - entry = (align_stack *) xmalloc (sizeof (* entry)); + entry = ggc_alloc (sizeof (* entry)); entry->alignment = alignment; entry->num_pushes = 1; @@ -98,24 +84,21 @@ Alignment must be a small power of two, not %d, in #pragma pack", /* 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(). */ + 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 * 8; + maximum_field_alignment = alignment; } else alignment_stack->num_pushes ++; - - return 1; } /* Undo a push of an alignment onto the stack. */ -static int -pop_alignment (id) - tree id; +static void +pop_alignment (tree id) { align_stack * entry; @@ -124,7 +107,7 @@ pop_alignment (id) warning ("\ #pragma pack (pop) encountered without matching #pragma pack (push, )" ); - return 0; + return; } /* If we got an identifier, strip away everything above the target @@ -151,338 +134,466 @@ pop_alignment (id) if (entry == NULL) maximum_field_alignment = default_alignment; else - maximum_field_alignment = entry->alignment * 8; - - free (alignment_stack); + maximum_field_alignment = entry->alignment; alignment_stack = entry; } - - return 1; } +#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 */ - -/* Handle one token of a pragma directive. TOKEN is the current token, and - STRING is its printable form. Some front ends do not support generating - tokens, and will only pass in a STRING. Also some front ends will reuse - the buffer containing STRING, so it must be copied to a local buffer if - it needs to be preserved. - - If STRING is non-NULL, then the return value will be ignored, and there - will be futher calls to handle_pragma_token() in order to handle the rest of - the line containing the #pragma directive. If STRING is NULL, the entire - line has now been presented to handle_pragma_token() and the return value - should be zero if the pragma flawed in some way, or if the pragma was not - recognised, and non-zero if it was successfully handled. */ - -int -handle_pragma_token (string, token) - const char * string; - tree token; + +/* #pragma pack () + #pragma pack (N) + + #pragma pack (push, N) + #pragma pack (push, ID, N) + #pragma pack (pop) + #pragma pack (pop, ID) */ +static void +handle_pragma_pack (cpp_reader *dummy ATTRIBUTE_UNUSED) { - static enum pragma_state state = ps_start; - static enum pragma_state type; -#ifdef HANDLE_PRAGMA_WEAK - static char * name; - static char * value; -#endif -#if defined(HANDLE_PRAGMA_PACK) || defined(HANDLE_PRAGMA_PACK_PUSH_POP) - static int align; -#endif - static tree id; + tree x, id = 0; + int align = -1; + enum cpp_ttype token; + enum { set, push, pop } action; - /* If we have reached the end of the #pragma directive then - determine what value we should return. */ - - if (string == NULL) + if (c_lex (&x) != CPP_OPEN_PAREN) + GCC_BAD ("missing '(' after '#pragma pack' - ignored"); + + token = c_lex (&x); + if (token == CPP_CLOSE_PAREN) { - int ret_val = 0; + action = set; + align = 0; + } + else if (token == CPP_NUMBER) + { + align = TREE_INT_CST_LOW (x); + action = set; + if (c_lex (&x) != CPP_CLOSE_PAREN) + GCC_BAD ("malformed '#pragma pack' - ignored"); + } + else if (token == CPP_NAME) + { +#define GCC_BAD_ACTION do { if (action == push) \ + 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 '%s' for '#pragma pack' - ignored", op); - switch (type) + token = c_lex (&x); + if (token != CPP_COMMA && action == push) + GCC_BAD_ACTION; + + if (token == CPP_COMMA) { - default: - abort (); - break; - - case ps_done: - /* The pragma was not recognised. */ - break; - -#ifdef HANDLE_PRAGMA_PACK - case ps_pack: - if (state == ps_right) + token = c_lex (&x); + if (token == CPP_NAME) { - maximum_field_alignment = align * 8; -#ifdef HANDLE_PRAGMA_PACK_PUSH_POP - default_alignment = maximum_field_alignment; -#endif - ret_val = 1; + id = x; + if (action == push && c_lex (&x) != CPP_COMMA) + GCC_BAD_ACTION; + token = c_lex (&x); } - else - warning ("malformed `#pragma pack'"); - break; -#endif /* HANDLE_PRAGMA_PACK */ - -#ifdef HANDLE_PRAGMA_PACK_PUSH_POP - case ps_push: - if (state == ps_right) - ret_val = push_alignment (align, id); - else - warning ("malformed '#pragma pack(push[,id],)'"); - break; - - case ps_pop: - if (state == ps_right) - ret_val = pop_alignment (id); - else - warning ("malformed '#pragma pack(pop[,id])'"); - break; -#endif /* HANDLE_PRAGMA_PACK_PUSH_POP */ - -#ifdef HANDLE_PRAGMA_WEAK - case ps_weak: - if (HANDLE_PRAGMA_WEAK) + + if (action == push) { - if (state == ps_name) - ret_val = add_weak (name, NULL); - else if (state == ps_value) - ret_val = add_weak (name, value); + if (token == CPP_NUMBER) + { + align = TREE_INT_CST_LOW (x); + token = c_lex (&x); + } else - warning ("malformed `#pragma weak'"); + GCC_BAD_ACTION; } - else - ret_val = 1; /* Ignore the pragma. */ - break; -#endif /* HANDLE_PRAGMA_WEAK */ - - case ps_poison: - ret_val = 1; - break; } - type = state = ps_start; - id = NULL_TREE; - - return ret_val; + if (token != CPP_CLOSE_PAREN) + GCC_BAD_ACTION; +#undef GCC_BAD_ACTION } - - /* If we have been given a token, but it is not an identifier, - or a small constant, then something has gone wrong. */ - if (token) + else + GCC_BAD ("malformed '#pragma pack' - ignored"); + + if (c_lex (&x) != CPP_EOF) + warning ("junk at end of '#pragma pack'"); + + if (action != pop) + switch (align) + { + case 0: + case 1: + case 2: + case 4: + case 8: + case 16: + align *= BITS_PER_UNIT; + break; + default: + GCC_BAD2 ("alignment must be a small power of two, not %d", align); + } + + switch (action) { - switch (TREE_CODE (token)) - { - case IDENTIFIER_NODE: - break; - - case INTEGER_CST: - if (TREE_INT_CST_HIGH (token) != 0) - return 0; - break; - - default: - return 0; - } + case set: SET_GLOBAL_ALIGNMENT (align); break; + case push: push_alignment (align, id); break; + case pop: pop_alignment (id); break; } - - switch (state) - { - case ps_start: - type = state = ps_done; -#ifdef HANDLE_PRAGMA_PACK - if (strcmp (string, "pack") == 0) - type = state = ps_pack; -#endif -#ifdef HANDLE_PRAGMA_WEAK - if (strcmp (string, "weak") == 0) - type = state = ps_weak; -#endif - if (strcmp (string, "poison") == 0) - type = state = ps_poison; - break; +} +#endif /* HANDLE_PRAGMA_PACK */ + +static GTY(()) tree pending_weaks; #ifdef HANDLE_PRAGMA_WEAK - case ps_weak: - name = permalloc (strlen (string) + 1); - if (name == NULL) - { - warning ("Out of memory parsing #pragma weak"); - state = ps_bad; - } - else - { - strcpy (name, string); - state = ps_name; - } - break; - - case ps_name: - state = (strcmp (string, "=") ? ps_bad : ps_equals); - break; +static void apply_pragma_weak (tree, tree); +static void handle_pragma_weak (cpp_reader *); - case ps_equals: - value = permalloc (strlen (string) + 1); - if (value == NULL) - { - warning ("Out of memory parsing #pragma weak"); - state = ps_bad; - } - else - { - strcpy (value, string); - state = ps_value; - } - break; +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 '%D' 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 abort() 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; + } +} + +/* #pragma weak name [= value] */ +static void +handle_pragma_weak (cpp_reader *dummy ATTRIBUTE_UNUSED) +{ + tree name, value, x, decl; + enum cpp_ttype t; + + value = 0; + + if (c_lex (&name) != CPP_NAME) + GCC_BAD ("malformed #pragma weak, ignored"); + t = c_lex (&x); + if (t == CPP_EQ) + { + if (c_lex (&value) != CPP_NAME) + GCC_BAD ("malformed #pragma weak, ignored"); + t = c_lex (&x); + } + if (t != CPP_EOF) + warning ("junk at end of #pragma weak"); - case ps_value: - state = ps_bad; - break; + 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 (tree decl ATTRIBUTE_UNUSED) +{ +} #endif /* HANDLE_PRAGMA_WEAK */ - -#ifdef HANDLE_PRAGMA_PACK - case ps_pack: - state = (strcmp (string, "(") ? ps_bad : ps_left); - break; - case ps_left: +/* 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. - if (token == NULL_TREE) - { - /* #pragma pack () resets packing rules to their - defaults. */ - if (strcmp (string, ")") == 0) - { - align = 0; - state = ps_right; - } - else - state = ps_bad; - } - else if (TREE_CODE (token) == INTEGER_CST) - goto handle_align; + Corner cases of these features and their interaction: -#ifdef HANDLE_PRAGMA_PACK_PUSH_POP - else if (TREE_CODE (token) == IDENTIFIER_NODE) - { - if (strcmp (string, "push") == 0) - type = state = ps_push; - else if (strcmp (string, "pop") == 0) - type = state = ps_pop; - else - state = ps_bad; - } -#endif - else - state = ps_bad; - break; + 1) Both pragmas silently apply only to declarations with external + linkage (that is, TREE_PUBLIC || DECL_EXTERNAL). Asm labels + do not have this restriction. - handle_align: - align = TREE_INT_CST_LOW (token); - switch (align) - { - case 1: - case 2: - case 4: - case 8: - case 16: - state = ps_align; - break; - - default: - state = ps_bad; - break; - } - break; + 2) In C++, both #pragmas silently apply only to extern "C" declarations. + Asm labels do not have this restriction. - case ps_align: - state = (strcmp (string, ")") ? ps_bad : ps_right); - break; + 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. - case ps_right: - state = ps_bad; - break; -#endif /* HANDLE_PRAGMA_PACK */ + 4) The "source name" for #pragma redefine_extname is the DECL_NAME, + *not* the DECL_ASSEMBLER_NAME. -#ifdef HANDLE_PRAGMA_PACK_PUSH_POP - case ps_push: - state = (strcmp (string, ",") ? ps_bad : ps_pushcomma); - break; + 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. - case ps_pushid: - state = (strcmp (string, ",") ? ps_bad : ps_pushcomma2); - break; + 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.) */ - case ps_pushcomma: - if (token && TREE_CODE (token) == IDENTIFIER_NODE) - { - id = token; - state = ps_pushid; - break; - } +static GTY(()) tree pending_redefine_extname; - /* else fall through */ - case ps_pushcomma2: - if (token && TREE_CODE (token) == INTEGER_CST) - goto handle_align; - else - state = ps_bad; - break; +static void handle_pragma_redefine_extname (cpp_reader *); - case ps_pop: - if (strcmp (string, ",") == 0) - state = ps_popcomma; - else - state = (strcmp (string, ")") ? ps_bad : ps_right); - break; +/* #pragma redefine_extname oldname newname */ +static void +handle_pragma_redefine_extname (cpp_reader *dummy ATTRIBUTE_UNUSED) +{ + 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"); + + 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; + } - case ps_popcomma: - if (token && TREE_CODE (token) == IDENTIFIER_NODE) + 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)) { - id = token; - state = ps_align; + 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 - state = ps_bad; - break; -#endif /* HANDLE_PRAGMA_PACK_PUSH_POP */ - - case ps_poison: - if (token && TREE_CODE (token) != IDENTIFIER_NODE) - state = ps_bad; - break; - - case ps_bad: - case ps_done: - break; - - default: - abort (); + 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); +} - return 1; +/* 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); } -#endif /* HANDLE_GENERIC_PRAGMAS */ - -#ifdef HANDLE_PRAGMA_PACK_PUSH_POP + +static GTY(()) tree pragma_extern_prefix; + +/* #pragma extern_prefix "prefix" */ static void -mark_align_stack (p) - void *p; +handle_pragma_extern_prefix (cpp_reader *dummy ATTRIBUTE_UNUSED) { - align_stack *a = *(align_stack **) p; + tree prefix, x; + enum cpp_ttype t; + + if (c_lex (&prefix) != CPP_STRING) + GCC_BAD ("malformed #pragma extern_prefix, ignored"); + t = c_lex (&x); + if (t != CPP_EOF) + warning ("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 ("#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. */ - while (a) +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)) { - ggc_mark_tree (a->id); - a = a->prev; + 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; } + + /* 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) + { + 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 = alloca (plen + ilen + 1); + + memcpy (newname, prefix, plen); + memcpy (newname + plen, id, ilen + 1); + + return build_string (plen + ilen, newname); + } + + /* Nada. */ + return 0; } -#endif +/* Front-end wrapper 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 *)) { -#ifdef HANDLE_PRAGMA_PACK_PUSH_POP - ggc_add_root (&alignment_stack, 1, sizeof(alignment_stack), - mark_align_stack); + cpp_register_pragma (parse_in, space, name, handler); +} + +/* Set up front-end pragmas. */ +void +init_pragma (void) +{ +#ifdef HANDLE_PRAGMA_PACK + c_register_pragma (0, "pack", handle_pragma_pack); +#endif +#ifdef HANDLE_PRAGMA_WEAK + c_register_pragma (0, "weak", handle_pragma_weak); +#endif + + 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"