X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Fc-pragma.c;h=df9e1bf3c3403b97de4b8d88261791a6f4930f00;hb=b0d8e49cb34af0a14e5e21c23a7933d482c5d3ec;hp=a28679e6e06edd752134015a24c084ad03d177e4;hpb=0d1d1815906e6ce976e7c855f3c0d61870de1c18;p=pf3gnuchains%2Fgcc-fork.git diff --git a/gcc/c-pragma.c b/gcc/c-pragma.c index a28679e6e06..df9e1bf3c34 100644 --- a/gcc/c-pragma.c +++ b/gcc/c-pragma.c @@ -1,448 +1,502 @@ /* Handle #pragma, system V.4 style. Supports #pragma weak and #pragma pack. - Copyright (C) 1992, 1997, 1998 Free Software Foundation, Inc. + Copyright (C) 1992, 1997, 1998, 1999, 2000, 2001, 2002 + 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 "rtl.h" #include "tree.h" -#include "except.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" -#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; + tree id; struct align_stack * prev; } align_stack; -static struct align_stack * alignment_stack = NULL; +static GTY(()) struct align_stack * alignment_stack; -static int push_alignment PROTO((int)); -static int pop_alignment PROTO((void)); +#ifdef HANDLE_PRAGMA_PACK +static void handle_pragma_pack PARAMS ((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; +#define SET_GLOBAL_ALIGNMENT(ALIGN) \ + (default_alignment = maximum_field_alignment = (ALIGN)) + +static void push_alignment PARAMS ((int, tree)); +static void pop_alignment PARAMS ((tree)); /* Push an alignment value onto the stack. */ -static int -push_alignment (alignment) +static void +push_alignment (alignment, id) 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) + || alignment_stack->alignment != alignment + || id != NULL_TREE) { align_stack * entry; - entry = (align_stack *) xmalloc (sizeof (* entry)); - - if (entry == NULL) - { - warning ("Out of memory pushing #pragma pack"); - return 0; - } + entry = (align_stack *) 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; - if (alignment < 8) - maximum_field_alignment = alignment * 8; - else - /* MSVC ignores alignments > 4. */ - maximum_field_alignment = 0; + maximum_field_alignment = alignment; } else alignment_stack->num_pushes ++; - - return 1; } /* Undo a push of an alignment onto the stack. */ -static int -pop_alignment () +static void +pop_alignment (id) + tree id; { + align_stack * entry; + if (alignment_stack == NULL) { warning ("\ -#pragma pack(pop) encountered without corresponding #pragma pack(push,)"); - return 0; +#pragma pack (pop) encountered without matching #pragma pack (push, )" + ); + return; + } + + /* If we got an identifier, strip away everything above the target + entry so that the next step will restore the state just below it. */ + if (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, )" + , IDENTIFIER_POINTER (id), IDENTIFIER_POINTER (id)); } if (-- alignment_stack->num_pushes == 0) { - align_stack * entry; - entry = alignment_stack->prev; - if (entry == NULL || entry->alignment > 4) - maximum_field_alignment = 0; + 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 */ -/* Generate 'packed' and 'aligned' attributes for decls whilst a - #pragma pack(push... is in effect. */ -void -insert_pack_attributes (node, attributes, prefix) - tree node; - tree * attributes; - tree * prefix; +/* #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 (dummy) + cpp_reader *dummy ATTRIBUTE_UNUSED; { - tree a; + tree x, id = 0; + int align = -1; + enum cpp_ttype token; + enum { set, push, pop } action; - /* If we are not packing, then there is nothing to do. */ - if (maximum_field_alignment == 0 - || alignment_stack == NULL) - return; - - /* We are only interested in fields. */ - if (TREE_CODE_CLASS (TREE_CODE (node)) != 'd' - || TREE_CODE (node) != FIELD_DECL) - return; + if (c_lex (&x) != CPP_OPEN_PAREN) + GCC_BAD ("missing '(' after '#pragma pack' - ignored"); - /* Add a 'packed' attribute. */ - * attributes = tree_cons (get_identifier ("packed"), NULL, * attributes); - - /* If the alignment is > 8 then add an alignment attribute as well. */ - if (maximum_field_alignment > 8) + token = c_lex (&x); + if (token == CPP_CLOSE_PAREN) { - /* If the aligned attribute is already present then do not override it. */ - for (a = * attributes; a; a = TREE_CHAIN (a)) - { - tree name = TREE_PURPOSE (a); - if (strcmp (IDENTIFIER_POINTER (name), "aligned") == 0) - break; - } - - if (a == NULL) - for (a = * prefix; a; a = TREE_CHAIN (a)) - { - tree name = TREE_PURPOSE (a); - if (strcmp (IDENTIFIER_POINTER (name), "aligned") == 0) - break; - } - - if (a == NULL) + 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); + + token = c_lex (&x); + if (token != CPP_COMMA && action == push) + GCC_BAD_ACTION; + + if (token == CPP_COMMA) { - * attributes = tree_cons - (get_identifier ("aligned"), - tree_cons (NULL, - build_int_2 (maximum_field_alignment / 8, 0), - NULL), - * attributes); + token = c_lex (&x); + if (token == CPP_NAME) + { + id = x; + if (action == push && c_lex (&x) != CPP_COMMA) + GCC_BAD_ACTION; + token = c_lex (&x); + } + + if (action == push) + { + if (token == CPP_NUMBER) + { + align = TREE_INT_CST_LOW (x); + token = c_lex (&x); + } + else + GCC_BAD_ACTION; + } } - } - return; + if (token != CPP_CLOSE_PAREN) + GCC_BAD_ACTION; +#undef GCC_BAD_ACTION + } + 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) + { + case set: SET_GLOBAL_ALIGNMENT (align); break; + case push: push_alignment (align, id); break; + case pop: pop_alignment (id); break; + } } -#endif /* HANDLE_PRAGMA_PACK_PUSH_POP */ - +#endif /* HANDLE_PRAGMA_PACK */ + +static GTY(()) tree pending_weaks; + #ifdef HANDLE_PRAGMA_WEAK -static int add_weak PROTO((char *, char *)); +static void apply_pragma_weak PARAMS ((tree, tree)); +static void handle_pragma_weak PARAMS ((cpp_reader *)); -static int -add_weak (name, value) - char * name; - char * value; +static void +apply_pragma_weak (decl, value) + tree decl, value; { - struct weak_syms * weak; + 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); + } - weak = (struct weak_syms *) permalloc (sizeof (struct weak_syms)); + 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); +} - if (weak == NULL) - return 0; - - weak->next = weak_decls; - weak->name = name; - weak->value = value; - weak_decls = weak; +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; - return 1; + 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; + } } -#endif /* HANDLE_PRAGMA_WEAK */ - -/* 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) - char * string; - tree token; + +/* #pragma weak name [= value] */ +static void +handle_pragma_weak (dummy) + cpp_reader *dummy ATTRIBUTE_UNUSED; { - static enum pragma_state state = ps_start; - static enum pragma_state type; - static char * name; - static char * value; - static int align; - - /* If we have reached the end of the #pragma directive then - determine what value we should return. */ - - if (string == NULL) + 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) { - int ret_val = 0; + 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"); - switch (type) - { - default: - abort (); - break; - - case ps_done: - /* The pragma was not recognised. */ - break; - -#ifdef HANDLE_PRAGMA_PACK - case ps_pack: - if (state == ps_right) - { - maximum_field_alignment = align * 8; - ret_val = 1; - } - 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); - else - warning ("incomplete '#pragma pack(push,)'"); - break; - - case ps_pop: - if (state == ps_right) - ret_val = pop_alignment (); - else - warning ("missing closing parenthesis in '#pragma pack(pop)'"); - break; -#endif /* HANDLE_PRAGMA_PACK_PUSH_POP */ - -#ifdef HANDLE_PRAGMA_WEAK - case ps_weak: - if (HANDLE_PRAGMA_WEAK) - { - if (state == ps_name) - ret_val = add_weak (name, NULL); - else if (state == ps_value) - ret_val = add_weak (name, value); - else - warning ("malformed `#pragma weak'"); - } - else - ret_val = 1; /* Ignore the pragma. */ - 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 (decl) + tree decl ATTRIBUTE_UNUSED; +{ +} #endif /* HANDLE_PRAGMA_WEAK */ - } - type = state = ps_start; - - return ret_val; +static GTY(()) tree pending_redefine_extname; + +#ifdef HANDLE_PRAGMA_REDEFINE_EXTNAME +static void handle_pragma_redefine_extname PARAMS ((cpp_reader *)); + +/* #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"); - /* If we have been given a token, but it is not an identifier, - or a small constant, then something has gone wrong. */ - if (token) + decl = identifier_global_value (oldname); + if (decl && TREE_CODE_CLASS (TREE_CODE (decl)) == 'd') { - switch (TREE_CODE (token)) - { - case IDENTIFIER_NODE: - break; - - case INTEGER_CST: - if (TREE_INT_CST_HIGH (token) != 0) - return 0; - break; - - default: - return 0; - } + 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); } - - switch (state) + else + pending_redefine_extname + = tree_cons (oldname, newname, pending_redefine_extname); +} +#endif + +static GTY(()) tree pragma_extern_prefix; + +#ifdef HANDLE_PRAGMA_EXTERN_PREFIX +static void handle_pragma_extern_prefix PARAMS ((cpp_reader *)); + +/* #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) { - case ps_start: - type = state = ps_done; -#ifdef HANDLE_PRAGMA_PACK - if (strcmp (string, "pack") == 0) - type = state = ps_pack; + 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 -#ifdef HANDLE_PRAGMA_WEAK - if (strcmp (string, "weak") == 0) - type = state = ps_weak; -#endif - break; - -#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; - 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; +/* Hook from the front ends to apply the results of one of the preceeding + pragmas that rename variables. */ - case ps_value: - state = ps_bad; - break; -#endif /* HANDLE_PRAGMA_WEAK */ - -#ifdef HANDLE_PRAGMA_PACK - case ps_pack: - state = (strcmp (string, "(") ? ps_bad : ps_left); - break; +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; - case ps_left: - align = atoi (string); - switch (align) + for (p = &pending_redefine_extname; (t = *p) ; p = &TREE_CHAIN (t)) + if (oldname == TREE_PURPOSE (t)) { - case 1: - case 2: - case 4: - state = ps_align; - break; - - case 0: - state = (strcmp (string, ")") ? ps_bad : ps_right); -#ifdef HANDLE_PRAGMA_PACK_PUSH_POP - if (state == ps_bad) - { - if (strcmp (string, "push") == 0) - type = state = ps_push; - else if (strcmp (string, "pop") == 0) - type = state = ps_pop; - } -#endif - break; + const char *newname = IDENTIFIER_POINTER (TREE_VALUE (t)); - default: - state = ps_bad; - break; - } - break; + if (asmname && strcmp (TREE_STRING_POINTER (asmname), newname) != 0) + warning ("#pragma redefine_extname conflicts with declaration"); + *p = TREE_CHAIN (t); -#ifdef HANDLE_PRAGMA_PACK_PUSH_POP - case ps_pop: + return build_string (strlen (newname), newname); + } + } #endif - case ps_align: - state = (strcmp (string, ")") ? ps_bad : ps_right); - break; - case ps_right: - state = ps_bad; - break; -#endif /* HANDLE_PRAGMA_PACK */ +#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 -#ifdef HANDLE_PRAGMA_PACK_PUSH_POP - case ps_push: - state = (strcmp (string, ",") ? ps_bad : ps_comma); - break; - - case ps_comma: - align = atoi (string); - state = ps_align; - break; -#endif /* HANDLE_PRAGMA_PACK_PUSH_POP */ - - case ps_bad: - case ps_done: - break; + return asmname; +} - default: - abort (); - } +void +init_pragma () +{ +#ifdef HANDLE_PRAGMA_PACK + cpp_register_pragma (parse_in, 0, "pack", handle_pragma_pack); +#endif +#ifdef HANDLE_PRAGMA_WEAK + cpp_register_pragma (parse_in, 0, "weak", handle_pragma_weak); +#endif +#ifdef HANDLE_PRAGMA_REDEFINE_EXTNAME + cpp_register_pragma (parse_in, 0, "redefine_extname", + handle_pragma_redefine_extname); +#endif +#ifdef HANDLE_PRAGMA_EXTERN_PREFIX + cpp_register_pragma (parse_in, 0, "extern_prefix", + handle_pragma_extern_prefix); +#endif - return 1; +#ifdef REGISTER_TARGET_PRAGMAS + REGISTER_TARGET_PRAGMAS (parse_in); +#endif } -#endif /* HANDLE_GENERIC_PRAGMAS */ + +#include "gt-c-pragma.h"