diff options
Diffstat (limited to 'gcc-4.2.1/gcc/c-pragma.c')
| -rw-r--r-- | gcc-4.2.1/gcc/c-pragma.c | 839 |
1 files changed, 839 insertions, 0 deletions
diff --git a/gcc-4.2.1/gcc/c-pragma.c b/gcc-4.2.1/gcc/c-pragma.c new file mode 100644 index 000000000..b2712acc9 --- /dev/null +++ b/gcc-4.2.1/gcc/c-pragma.c @@ -0,0 +1,839 @@ +/* Handle #pragma, system V.4 style. Supports #pragma weak and #pragma pack. + Copyright (C) 1992, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, + 2006 Free Software Foundation, Inc. + +This file is part of GCC. + +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. + +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 GCC; see the file COPYING. If not, write to the Free +Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301, USA. */ + +#include "config.h" +#include "system.h" +#include "coretypes.h" +#include "tm.h" +#include "rtl.h" +#include "tree.h" +#include "function.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 "vec.h" +#include "target.h" +#include "diagnostic.h" +#include "opts.h" + +#define GCC_BAD(gmsgid) \ + do { warning (OPT_Wpragmas, gmsgid); return; } while (0) +#define GCC_BAD2(gmsgid, arg) \ + do { warning (OPT_Wpragmas, gmsgid, arg); return; } while (0) + +typedef struct align_stack GTY(()) +{ + int alignment; + tree id; + struct align_stack * prev; +} align_stack; + +static GTY(()) struct align_stack * alignment_stack; + +#ifdef HANDLE_PRAGMA_PACK +static void handle_pragma_pack (cpp_reader *); + +#ifdef HANDLE_PRAGMA_PACK_PUSH_POP +/* If we have a "global" #pragma pack(<n>) in effect when the first + #pragma pack(push,<n>) 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) (maximum_field_alignment = *(alignment_stack == NULL \ + ? &default_alignment \ + : &alignment_stack->alignment) = (ALIGN)) + +static void push_alignment (int, tree); +static void pop_alignment (tree); + +/* Push an alignment value onto the stack. */ +static void +push_alignment (int alignment, tree id) +{ + align_stack * entry; + + entry = GGC_NEW (align_stack); + + 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(<n>) 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; +} + +/* Undo a push of an alignment onto the stack. */ +static void +pop_alignment (tree id) +{ + align_stack * entry; + + if (alignment_stack == NULL) + 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. */ + if (id) + { + for (entry = alignment_stack; entry; entry = entry->prev) + if (entry->id == id) + { + alignment_stack = entry; + break; + } + if (entry == NULL) + warning (OPT_Wpragmas, "\ +#pragma pack(pop, %s) encountered without matching #pragma pack(push, %s)" + , IDENTIFIER_POINTER (id), IDENTIFIER_POINTER (id)); + } + + entry = alignment_stack->prev; + + maximum_field_alignment = entry ? entry->alignment : default_alignment; + + alignment_stack = entry; +} +#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], <n>) is not supported on this target") +#define pop_alignment(ID) \ + GCC_BAD ("#pragma pack(pop[, id], <n>) 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 (cpp_reader * ARG_UNUSED (dummy)) +{ + tree x, id = 0; + int align = -1; + enum cpp_ttype token; + enum { set, push, pop } action; + + if (pragma_lex (&x) != CPP_OPEN_PAREN) + GCC_BAD ("missing %<(%> after %<#pragma pack%> - ignored"); + + token = pragma_lex (&x); + if (token == CPP_CLOSE_PAREN) + { + action = set; + align = initial_max_fld_align; + } + else if (token == CPP_NUMBER) + { + if (TREE_CODE (x) != INTEGER_CST) + GCC_BAD ("invalid constant in %<#pragma pack%> - ignored"); + align = TREE_INT_CST_LOW (x); + action = set; + if (pragma_lex (&x) != CPP_CLOSE_PAREN) + 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][, <n>])%> - 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 %qs for %<#pragma pack%> - ignored", op); + + while ((token = pragma_lex (&x)) == CPP_COMMA) + { + token = pragma_lex (&x); + if (token == CPP_NAME && id == 0) + { + id = x; + } + else if (token == CPP_NUMBER && action == push && align == -1) + { + if (TREE_CODE (x) != INTEGER_CST) + GCC_BAD ("invalid constant in %<#pragma pack%> - ignored"); + align = TREE_INT_CST_LOW (x); + if (align == -1) + action = set; + } + else + GCC_BAD_ACTION; + } + + if (token != CPP_CLOSE_PAREN) + GCC_BAD_ACTION; +#undef GCC_BAD_ACTION + } + else + GCC_BAD ("malformed %<#pragma pack%> - ignored"); + + if (pragma_lex (&x) != CPP_EOF) + warning (OPT_Wpragmas, "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) + { + case set: SET_GLOBAL_ALIGNMENT (align); break; + case push: push_alignment (align, id); break; + case pop: pop_alignment (id); break; + } +} +#endif /* HANDLE_PRAGMA_PACK */ + +static GTY(()) tree pending_weaks; + +#ifdef HANDLE_PRAGMA_WEAK +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 (OPT_Wpragmas, "applying #pragma weak %q+D after first use " + "results in unspecified behavior", 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 (cpp_reader * ARG_UNUSED (dummy)) +{ + tree name, value, x, decl; + enum cpp_ttype t; + + value = 0; + + if (pragma_lex (&name) != CPP_NAME) + GCC_BAD ("malformed #pragma weak, ignored"); + t = pragma_lex (&x); + if (t == CPP_EQ) + { + if (pragma_lex (&value) != CPP_NAME) + GCC_BAD ("malformed #pragma weak, ignored"); + t = pragma_lex (&x); + } + if (t != CPP_EOF) + warning (OPT_Wpragmas, "junk at end of %<#pragma weak%>"); + + 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); +} +#else +void +maybe_apply_pragma_weak (tree ARG_UNUSED (decl)) +{ +} + +void +maybe_apply_pending_pragma_weaks (void) +{ +} +#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%>"); +} + +#endif + +static void +handle_pragma_diagnostic(cpp_reader *ARG_UNUSED(dummy)) +{ + const char *kind_string, *option_string; + unsigned int option_index; + enum cpp_ttype token; + diagnostic_t kind; + tree x; + + if (cfun) + { + error ("#pragma GCC diagnostic not allowed inside functions"); + return; + } + + token = pragma_lex (&x); + if (token != CPP_NAME) + GCC_BAD ("missing [error|warning|ignored] after %<#pragma GCC diagnostic%>"); + kind_string = IDENTIFIER_POINTER (x); + if (strcmp (kind_string, "error") == 0) + kind = DK_ERROR; + else if (strcmp (kind_string, "warning") == 0) + kind = DK_WARNING; + else if (strcmp (kind_string, "ignored") == 0) + kind = DK_IGNORED; + else + GCC_BAD ("expected [error|warning|ignored] after %<#pragma GCC diagnostic%>"); + + token = pragma_lex (&x); + if (token != CPP_STRING) + GCC_BAD ("missing option after %<#pragma GCC diagnostic%> kind"); + option_string = TREE_STRING_POINTER (x); + for (option_index = 0; option_index < cl_options_count; option_index++) + if (strcmp (cl_options[option_index].opt_text, option_string) == 0) + { + /* This overrides -Werror, for example. */ + diagnostic_classify_diagnostic (global_dc, option_index, kind); + /* This makes sure the option is enabled, like -Wfoo would do. */ + if (cl_options[option_index].var_type == CLVC_BOOLEAN + && cl_options[option_index].flag_var + && kind != DK_IGNORED) + *(int *) cl_options[option_index].flag_var = 1; + return; + } + GCC_BAD ("unknown option after %<#pragma GCC diagnostic%> kind"); +} + +/* A vector of registered pragma callbacks. */ + +DEF_VEC_O (pragma_handler); +DEF_VEC_ALLOC_O (pragma_handler, heap); + +static VEC(pragma_handler, heap) *registered_pragmas; + +/* Front-end wrappers for pragma registration to avoid dragging + cpplib.h in almost everywhere. */ + +static void +c_register_pragma_1 (const char *space, const char *name, + pragma_handler handler, bool allow_expansion) +{ + unsigned id; + + VEC_safe_push (pragma_handler, heap, registered_pragmas, &handler); + id = VEC_length (pragma_handler, registered_pragmas); + id += PRAGMA_FIRST_EXTERNAL - 1; + + /* The C++ front end allocates 6 bits in cp_token; the C front end + allocates 7 bits in c_token. At present this is sufficient. */ + gcc_assert (id < 64); + + cpp_register_deferred_pragma (parse_in, space, name, id, + allow_expansion, false); +} + +void +c_register_pragma (const char *space, const char *name, pragma_handler handler) +{ + c_register_pragma_1 (space, name, handler, false); +} + +void +c_register_pragma_with_expansion (const char *space, const char *name, + pragma_handler handler) +{ + c_register_pragma_1 (space, name, handler, true); +} + +void +c_invoke_pragma_handler (unsigned int id) +{ + pragma_handler handler; + + id -= PRAGMA_FIRST_EXTERNAL; + handler = *VEC_index (pragma_handler, registered_pragmas, id); + + handler (parse_in); +} + +/* Set up front-end pragmas. */ +void +init_pragma (void) +{ + if (flag_openmp && !flag_preprocess_only) + { + struct omp_pragma_def { const char *name; unsigned int id; }; + static const struct omp_pragma_def omp_pragmas[] = { + { "atomic", PRAGMA_OMP_ATOMIC }, + { "barrier", PRAGMA_OMP_BARRIER }, + { "critical", PRAGMA_OMP_CRITICAL }, + { "flush", PRAGMA_OMP_FLUSH }, + { "for", PRAGMA_OMP_FOR }, + { "master", PRAGMA_OMP_MASTER }, + { "ordered", PRAGMA_OMP_ORDERED }, + { "parallel", PRAGMA_OMP_PARALLEL }, + { "section", PRAGMA_OMP_SECTION }, + { "sections", PRAGMA_OMP_SECTIONS }, + { "single", PRAGMA_OMP_SINGLE }, + { "threadprivate", PRAGMA_OMP_THREADPRIVATE } + }; + + const int n_omp_pragmas = sizeof (omp_pragmas) / sizeof (*omp_pragmas); + int i; + + for (i = 0; i < n_omp_pragmas; ++i) + cpp_register_deferred_pragma (parse_in, "omp", omp_pragmas[i].name, + omp_pragmas[i].id, true, true); + } + + cpp_register_deferred_pragma (parse_in, "GCC", "pch_preprocess", + PRAGMA_GCC_PCH_PREPROCESS, false, false); + +#ifdef 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 + c_register_pragma (0, "weak", handle_pragma_weak); +#endif +#ifdef HANDLE_PRAGMA_VISIBILITY + c_register_pragma ("GCC", "visibility", handle_pragma_visibility); +#endif + + c_register_pragma ("GCC", "diagnostic", handle_pragma_diagnostic); + + c_register_pragma_with_expansion (0, "redefine_extname", handle_pragma_redefine_extname); + c_register_pragma (0, "extern_prefix", handle_pragma_extern_prefix); + +#ifdef REGISTER_TARGET_PRAGMAS + REGISTER_TARGET_PRAGMAS (); +#endif +} + +#include "gt-c-pragma.h" |