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diff --git a/libcpp/directives.c b/libcpp/directives.c
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+/* CPP Library. (Directive handling.)
+ Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
+ 1999, 2000, 2001, 2002, 2003, 2004, 2005,
+ 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+ Contributed by Per Bothner, 1994-95.
+ Based on CCCP program by Paul Rubin, June 1986
+ Adapted to ANSI C, Richard Stallman, Jan 1987
+
+This program 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 3, or (at your option) any
+later version.
+
+This program 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 this program; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
+
+#include "config.h"
+#include "system.h"
+#include "cpplib.h"
+#include "internal.h"
+#include "mkdeps.h"
+#include "obstack.h"
+
+/* Stack of conditionals currently in progress
+ (including both successful and failing conditionals). */
+struct if_stack
+{
+ struct if_stack *next;
+ linenum_type line; /* Line where condition started. */
+ const cpp_hashnode *mi_cmacro;/* macro name for #ifndef around entire file */
+ bool skip_elses; /* Can future #else / #elif be skipped? */
+ bool was_skipping; /* If were skipping on entry. */
+ int type; /* Most recent conditional for diagnostics. */
+};
+
+/* Contains a registered pragma or pragma namespace. */
+typedef void (*pragma_cb) (cpp_reader *);
+struct pragma_entry
+{
+ struct pragma_entry *next;
+ const cpp_hashnode *pragma; /* Name and length. */
+ bool is_nspace;
+ bool is_internal;
+ bool is_deferred;
+ bool allow_expansion;
+ union {
+ pragma_cb handler;
+ struct pragma_entry *space;
+ unsigned int ident;
+ } u;
+};
+
+/* Values for the origin field of struct directive. KANDR directives
+ come from traditional (K&R) C. STDC89 directives come from the
+ 1989 C standard. EXTENSION directives are extensions. */
+#define KANDR 0
+#define STDC89 1
+#define EXTENSION 2
+
+/* Values for the flags field of struct directive. COND indicates a
+ conditional; IF_COND an opening conditional. INCL means to treat
+ "..." and <...> as q-char and h-char sequences respectively. IN_I
+ means this directive should be handled even if -fpreprocessed is in
+ effect (these are the directives with callback hooks).
+
+ EXPAND is set on directives that are always macro-expanded. */
+#define COND (1 << 0)
+#define IF_COND (1 << 1)
+#define INCL (1 << 2)
+#define IN_I (1 << 3)
+#define EXPAND (1 << 4)
+#define DEPRECATED (1 << 5)
+
+/* Defines one #-directive, including how to handle it. */
+typedef void (*directive_handler) (cpp_reader *);
+typedef struct directive directive;
+struct directive
+{
+ directive_handler handler; /* Function to handle directive. */
+ const uchar *name; /* Name of directive. */
+ unsigned short length; /* Length of name. */
+ unsigned char origin; /* Origin of directive. */
+ unsigned char flags; /* Flags describing this directive. */
+};
+
+/* Forward declarations. */
+
+static void skip_rest_of_line (cpp_reader *);
+static void check_eol (cpp_reader *, bool);
+static void start_directive (cpp_reader *);
+static void prepare_directive_trad (cpp_reader *);
+static void end_directive (cpp_reader *, int);
+static void directive_diagnostics (cpp_reader *, const directive *, int);
+static void run_directive (cpp_reader *, int, const char *, size_t);
+static char *glue_header_name (cpp_reader *);
+static const char *parse_include (cpp_reader *, int *, const cpp_token ***,
+ source_location *);
+static void push_conditional (cpp_reader *, int, int, const cpp_hashnode *);
+static unsigned int read_flag (cpp_reader *, unsigned int);
+static bool strtolinenum (const uchar *, size_t, linenum_type *, bool *);
+static void do_diagnostic (cpp_reader *, int, int, int);
+static cpp_hashnode *lex_macro_node (cpp_reader *, bool);
+static int undefine_macros (cpp_reader *, cpp_hashnode *, void *);
+static void do_include_common (cpp_reader *, enum include_type);
+static struct pragma_entry *lookup_pragma_entry (struct pragma_entry *,
+ const cpp_hashnode *);
+static int count_registered_pragmas (struct pragma_entry *);
+static char ** save_registered_pragmas (struct pragma_entry *, char **);
+static char ** restore_registered_pragmas (cpp_reader *, struct pragma_entry *,
+ char **);
+static void do_pragma_once (cpp_reader *);
+static void do_pragma_poison (cpp_reader *);
+static void do_pragma_system_header (cpp_reader *);
+static void do_pragma_dependency (cpp_reader *);
+static void do_linemarker (cpp_reader *);
+static const cpp_token *get_token_no_padding (cpp_reader *);
+static const cpp_token *get__Pragma_string (cpp_reader *);
+static void destringize_and_run (cpp_reader *, const cpp_string *);
+static int parse_answer (cpp_reader *, struct answer **, int, source_location);
+static cpp_hashnode *parse_assertion (cpp_reader *, struct answer **, int);
+static struct answer ** find_answer (cpp_hashnode *, const struct answer *);
+static void handle_assertion (cpp_reader *, const char *, int);
+static void do_pragma_push_macro (cpp_reader *);
+static void do_pragma_pop_macro (cpp_reader *);
+static void cpp_pop_definition (cpp_reader *, struct def_pragma_macro *);
+
+/* This is the table of directive handlers. It is ordered by
+ frequency of occurrence; the numbers at the end are directive
+ counts from all the source code I have lying around (egcs and libc
+ CVS as of 1999-05-18, plus grub-0.5.91, linux-2.2.9, and
+ pcmcia-cs-3.0.9). This is no longer important as directive lookup
+ is now O(1). All extensions other than #warning, #include_next,
+ and #import are deprecated. The name is where the extension
+ appears to have come from. */
+
+#define DIRECTIVE_TABLE \
+D(define, T_DEFINE = 0, KANDR, IN_I) /* 270554 */ \
+D(include, T_INCLUDE, KANDR, INCL | EXPAND) /* 52262 */ \
+D(endif, T_ENDIF, KANDR, COND) /* 45855 */ \
+D(ifdef, T_IFDEF, KANDR, COND | IF_COND) /* 22000 */ \
+D(if, T_IF, KANDR, COND | IF_COND | EXPAND) /* 18162 */ \
+D(else, T_ELSE, KANDR, COND) /* 9863 */ \
+D(ifndef, T_IFNDEF, KANDR, COND | IF_COND) /* 9675 */ \
+D(undef, T_UNDEF, KANDR, IN_I) /* 4837 */ \
+D(line, T_LINE, KANDR, EXPAND) /* 2465 */ \
+D(elif, T_ELIF, STDC89, COND | EXPAND) /* 610 */ \
+D(error, T_ERROR, STDC89, 0) /* 475 */ \
+D(pragma, T_PRAGMA, STDC89, IN_I) /* 195 */ \
+D(warning, T_WARNING, EXTENSION, 0) /* 22 */ \
+D(include_next, T_INCLUDE_NEXT, EXTENSION, INCL | EXPAND) /* 19 */ \
+D(ident, T_IDENT, EXTENSION, IN_I) /* 11 */ \
+D(import, T_IMPORT, EXTENSION, INCL | EXPAND) /* 0 ObjC */ \
+D(assert, T_ASSERT, EXTENSION, DEPRECATED) /* 0 SVR4 */ \
+D(unassert, T_UNASSERT, EXTENSION, DEPRECATED) /* 0 SVR4 */ \
+D(sccs, T_SCCS, EXTENSION, IN_I) /* 0 SVR4? */
+
+/* #sccs is synonymous with #ident. */
+#define do_sccs do_ident
+
+/* Use the table to generate a series of prototypes, an enum for the
+ directive names, and an array of directive handlers. */
+
+#define D(name, t, o, f) static void do_##name (cpp_reader *);
+DIRECTIVE_TABLE
+#undef D
+
+#define D(n, tag, o, f) tag,
+enum
+{
+ DIRECTIVE_TABLE
+ N_DIRECTIVES
+};
+#undef D
+
+#define D(name, t, origin, flags) \
+{ do_##name, (const uchar *) #name, \
+ sizeof #name - 1, origin, flags },
+static const directive dtable[] =
+{
+DIRECTIVE_TABLE
+};
+#undef D
+#undef DIRECTIVE_TABLE
+
+/* Wrapper struct directive for linemarkers.
+ The origin is more or less true - the original K+R cpp
+ did use this notation in its preprocessed output. */
+static const directive linemarker_dir =
+{
+ do_linemarker, UC"#", 1, KANDR, IN_I
+};
+
+#define SEEN_EOL() (pfile->cur_token[-1].type == CPP_EOF)
+
+/* Skip any remaining tokens in a directive. */
+static void
+skip_rest_of_line (cpp_reader *pfile)
+{
+ /* Discard all stacked contexts. */
+ while (pfile->context->prev)
+ _cpp_pop_context (pfile);
+
+ /* Sweep up all tokens remaining on the line. */
+ if (! SEEN_EOL ())
+ while (_cpp_lex_token (pfile)->type != CPP_EOF)
+ ;
+}
+
+/* Ensure there are no stray tokens at the end of a directive. If
+ EXPAND is true, tokens macro-expanding to nothing are allowed. */
+static void
+check_eol (cpp_reader *pfile, bool expand)
+{
+ if (! SEEN_EOL () && (expand
+ ? cpp_get_token (pfile)
+ : _cpp_lex_token (pfile))->type != CPP_EOF)
+ cpp_error (pfile, CPP_DL_PEDWARN, "extra tokens at end of #%s directive",
+ pfile->directive->name);
+}
+
+/* Ensure there are no stray tokens other than comments at the end of
+ a directive, and gather the comments. */
+static const cpp_token **
+check_eol_return_comments (cpp_reader *pfile)
+{
+ size_t c;
+ size_t capacity = 8;
+ const cpp_token **buf;
+
+ buf = XNEWVEC (const cpp_token *, capacity);
+ c = 0;
+ if (! SEEN_EOL ())
+ {
+ while (1)
+ {
+ const cpp_token *tok;
+
+ tok = _cpp_lex_token (pfile);
+ if (tok->type == CPP_EOF)
+ break;
+ if (tok->type != CPP_COMMENT)
+ cpp_error (pfile, CPP_DL_PEDWARN,
+ "extra tokens at end of #%s directive",
+ pfile->directive->name);
+ else
+ {
+ if (c + 1 >= capacity)
+ {
+ capacity *= 2;
+ buf = XRESIZEVEC (const cpp_token *, buf, capacity);
+ }
+ buf[c] = tok;
+ ++c;
+ }
+ }
+ }
+ buf[c] = NULL;
+ return buf;
+}
+
+/* Called when entering a directive, _Pragma or command-line directive. */
+static void
+start_directive (cpp_reader *pfile)
+{
+ /* Setup in-directive state. */
+ pfile->state.in_directive = 1;
+ pfile->state.save_comments = 0;
+ pfile->directive_result.type = CPP_PADDING;
+
+ /* Some handlers need the position of the # for diagnostics. */
+ pfile->directive_line = pfile->line_table->highest_line;
+}
+
+/* Called when leaving a directive, _Pragma or command-line directive. */
+static void
+end_directive (cpp_reader *pfile, int skip_line)
+{
+ if (CPP_OPTION (pfile, traditional))
+ {
+ /* Revert change of prepare_directive_trad. */
+ if (!pfile->state.in_deferred_pragma)
+ pfile->state.prevent_expansion--;
+
+ if (pfile->directive != &dtable[T_DEFINE])
+ _cpp_remove_overlay (pfile);
+ }
+ else if (pfile->state.in_deferred_pragma)
+ ;
+ /* We don't skip for an assembler #. */
+ else if (skip_line)
+ {
+ skip_rest_of_line (pfile);
+ if (!pfile->keep_tokens)
+ {
+ pfile->cur_run = &pfile->base_run;
+ pfile->cur_token = pfile->base_run.base;
+ }
+ }
+
+ /* Restore state. */
+ pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments);
+ pfile->state.in_directive = 0;
+ pfile->state.in_expression = 0;
+ pfile->state.angled_headers = 0;
+ pfile->directive = 0;
+}
+
+/* Prepare to handle the directive in pfile->directive. */
+static void
+prepare_directive_trad (cpp_reader *pfile)
+{
+ if (pfile->directive != &dtable[T_DEFINE])
+ {
+ bool no_expand = (pfile->directive
+ && ! (pfile->directive->flags & EXPAND));
+ bool was_skipping = pfile->state.skipping;
+
+ pfile->state.in_expression = (pfile->directive == &dtable[T_IF]
+ || pfile->directive == &dtable[T_ELIF]);
+ if (pfile->state.in_expression)
+ pfile->state.skipping = false;
+
+ if (no_expand)
+ pfile->state.prevent_expansion++;
+ _cpp_scan_out_logical_line (pfile, NULL);
+ if (no_expand)
+ pfile->state.prevent_expansion--;
+
+ pfile->state.skipping = was_skipping;
+ _cpp_overlay_buffer (pfile, pfile->out.base,
+ pfile->out.cur - pfile->out.base);
+ }
+
+ /* Stop ISO C from expanding anything. */
+ pfile->state.prevent_expansion++;
+}
+
+/* Output diagnostics for a directive DIR. INDENTED is nonzero if
+ the '#' was indented. */
+static void
+directive_diagnostics (cpp_reader *pfile, const directive *dir, int indented)
+{
+ /* Issue -pedantic or deprecated warnings for extensions. We let
+ -pedantic take precedence if both are applicable. */
+ if (! pfile->state.skipping)
+ {
+ if (dir->origin == EXTENSION
+ && !(dir == &dtable[T_IMPORT] && CPP_OPTION (pfile, objc))
+ && CPP_PEDANTIC (pfile))
+ cpp_error (pfile, CPP_DL_PEDWARN, "#%s is a GCC extension", dir->name);
+ else if (((dir->flags & DEPRECATED) != 0
+ || (dir == &dtable[T_IMPORT] && !CPP_OPTION (pfile, objc)))
+ && CPP_OPTION (pfile, cpp_warn_deprecated))
+ cpp_warning (pfile, CPP_W_DEPRECATED,
+ "#%s is a deprecated GCC extension", dir->name);
+ }
+
+ /* Traditionally, a directive is ignored unless its # is in
+ column 1. Therefore in code intended to work with K+R
+ compilers, directives added by C89 must have their #
+ indented, and directives present in traditional C must not.
+ This is true even of directives in skipped conditional
+ blocks. #elif cannot be used at all. */
+ if (CPP_WTRADITIONAL (pfile))
+ {
+ if (dir == &dtable[T_ELIF])
+ cpp_warning (pfile, CPP_W_TRADITIONAL,
+ "suggest not using #elif in traditional C");
+ else if (indented && dir->origin == KANDR)
+ cpp_warning (pfile, CPP_W_TRADITIONAL,
+ "traditional C ignores #%s with the # indented",
+ dir->name);
+ else if (!indented && dir->origin != KANDR)
+ cpp_warning (pfile, CPP_W_TRADITIONAL,
+ "suggest hiding #%s from traditional C with an indented #",
+ dir->name);
+ }
+}
+
+/* Check if we have a known directive. INDENTED is nonzero if the
+ '#' of the directive was indented. This function is in this file
+ to save unnecessarily exporting dtable etc. to lex.c. Returns
+ nonzero if the line of tokens has been handled, zero if we should
+ continue processing the line. */
+int
+_cpp_handle_directive (cpp_reader *pfile, int indented)
+{
+ const directive *dir = 0;
+ const cpp_token *dname;
+ bool was_parsing_args = pfile->state.parsing_args;
+ bool was_discarding_output = pfile->state.discarding_output;
+ int skip = 1;
+
+ if (was_discarding_output)
+ pfile->state.prevent_expansion = 0;
+
+ if (was_parsing_args)
+ {
+ if (CPP_OPTION (pfile, cpp_pedantic))
+ cpp_error (pfile, CPP_DL_PEDWARN,
+ "embedding a directive within macro arguments is not portable");
+ pfile->state.parsing_args = 0;
+ pfile->state.prevent_expansion = 0;
+ }
+ start_directive (pfile);
+ dname = _cpp_lex_token (pfile);
+
+ if (dname->type == CPP_NAME)
+ {
+ if (dname->val.node.node->is_directive)
+ dir = &dtable[dname->val.node.node->directive_index];
+ }
+ /* We do not recognize the # followed by a number extension in
+ assembler code. */
+ else if (dname->type == CPP_NUMBER && CPP_OPTION (pfile, lang) != CLK_ASM)
+ {
+ dir = &linemarker_dir;
+ if (CPP_PEDANTIC (pfile) && ! CPP_OPTION (pfile, preprocessed)
+ && ! pfile->state.skipping)
+ cpp_error (pfile, CPP_DL_PEDWARN,
+ "style of line directive is a GCC extension");
+ }
+
+ if (dir)
+ {
+ /* If we have a directive that is not an opening conditional,
+ invalidate any control macro. */
+ if (! (dir->flags & IF_COND))
+ pfile->mi_valid = false;
+
+ /* Kluge alert. In order to be sure that code like this
+
+ #define HASH #
+ HASH define foo bar
+
+ does not cause '#define foo bar' to get executed when
+ compiled with -save-temps, we recognize directives in
+ -fpreprocessed mode only if the # is in column 1. macro.c
+ puts a space in front of any '#' at the start of a macro.
+
+ We exclude the -fdirectives-only case because macro expansion
+ has not been performed yet, and block comments can cause spaces
+ to preceed the directive. */
+ if (CPP_OPTION (pfile, preprocessed)
+ && !CPP_OPTION (pfile, directives_only)
+ && (indented || !(dir->flags & IN_I)))
+ {
+ skip = 0;
+ dir = 0;
+ }
+ else
+ {
+ /* In failed conditional groups, all non-conditional
+ directives are ignored. Before doing that, whether
+ skipping or not, we should lex angle-bracketed headers
+ correctly, and maybe output some diagnostics. */
+ pfile->state.angled_headers = dir->flags & INCL;
+ pfile->state.directive_wants_padding = dir->flags & INCL;
+ if (! CPP_OPTION (pfile, preprocessed))
+ directive_diagnostics (pfile, dir, indented);
+ if (pfile->state.skipping && !(dir->flags & COND))
+ dir = 0;
+ }
+ }
+ else if (dname->type == CPP_EOF)
+ ; /* CPP_EOF is the "null directive". */
+ else
+ {
+ /* An unknown directive. Don't complain about it in assembly
+ source: we don't know where the comments are, and # may
+ introduce assembler pseudo-ops. Don't complain about invalid
+ directives in skipped conditional groups (6.10 p4). */
+ if (CPP_OPTION (pfile, lang) == CLK_ASM)
+ skip = 0;
+ else if (!pfile->state.skipping)
+ cpp_error (pfile, CPP_DL_ERROR, "invalid preprocessing directive #%s",
+ cpp_token_as_text (pfile, dname));
+ }
+
+ pfile->directive = dir;
+ if (CPP_OPTION (pfile, traditional))
+ prepare_directive_trad (pfile);
+
+ if (dir)
+ pfile->directive->handler (pfile);
+ else if (skip == 0)
+ _cpp_backup_tokens (pfile, 1);
+
+ end_directive (pfile, skip);
+ if (was_parsing_args && !pfile->state.in_deferred_pragma)
+ {
+ /* Restore state when within macro args. */
+ pfile->state.parsing_args = 2;
+ pfile->state.prevent_expansion = 1;
+ }
+ if (was_discarding_output)
+ pfile->state.prevent_expansion = 1;
+ return skip;
+}
+
+/* Directive handler wrapper used by the command line option
+ processor. BUF is \n terminated. */
+static void
+run_directive (cpp_reader *pfile, int dir_no, const char *buf, size_t count)
+{
+ cpp_push_buffer (pfile, (const uchar *) buf, count,
+ /* from_stage3 */ true);
+ start_directive (pfile);
+
+ /* This is a short-term fix to prevent a leading '#' being
+ interpreted as a directive. */
+ _cpp_clean_line (pfile);
+
+ pfile->directive = &dtable[dir_no];
+ if (CPP_OPTION (pfile, traditional))
+ prepare_directive_trad (pfile);
+ pfile->directive->handler (pfile);
+ end_directive (pfile, 1);
+ _cpp_pop_buffer (pfile);
+}
+
+/* Checks for validity the macro name in #define, #undef, #ifdef and
+ #ifndef directives. IS_DEF_OR_UNDEF is true if this call is
+ processing a #define or #undefine directive, and false
+ otherwise. */
+static cpp_hashnode *
+lex_macro_node (cpp_reader *pfile, bool is_def_or_undef)
+{
+ const cpp_token *token = _cpp_lex_token (pfile);
+
+ /* The token immediately after #define must be an identifier. That
+ identifier may not be "defined", per C99 6.10.8p4.
+ In C++, it may not be any of the "named operators" either,
+ per C++98 [lex.digraph], [lex.key].
+ Finally, the identifier may not have been poisoned. (In that case
+ the lexer has issued the error message for us.) */
+
+ if (token->type == CPP_NAME)
+ {
+ cpp_hashnode *node = token->val.node.node;
+
+ if (is_def_or_undef && node == pfile->spec_nodes.n_defined)
+ cpp_error (pfile, CPP_DL_ERROR,
+ "\"defined\" cannot be used as a macro name");
+ else if (! (node->flags & NODE_POISONED))
+ return node;
+ }
+ else if (token->flags & NAMED_OP)
+ cpp_error (pfile, CPP_DL_ERROR,
+ "\"%s\" cannot be used as a macro name as it is an operator in C++",
+ NODE_NAME (token->val.node.node));
+ else if (token->type == CPP_EOF)
+ cpp_error (pfile, CPP_DL_ERROR, "no macro name given in #%s directive",
+ pfile->directive->name);
+ else
+ cpp_error (pfile, CPP_DL_ERROR, "macro names must be identifiers");
+
+ return NULL;
+}
+
+/* Process a #define directive. Most work is done in macro.c. */
+static void
+do_define (cpp_reader *pfile)
+{
+ cpp_hashnode *node = lex_macro_node (pfile, true);
+
+ if (node)
+ {
+ /* If we have been requested to expand comments into macros,
+ then re-enable saving of comments. */
+ pfile->state.save_comments =
+ ! CPP_OPTION (pfile, discard_comments_in_macro_exp);
+
+ if (pfile->cb.before_define)
+ pfile->cb.before_define (pfile);
+
+ if (_cpp_create_definition (pfile, node))
+ if (pfile->cb.define)
+ pfile->cb.define (pfile, pfile->directive_line, node);
+
+ node->flags &= ~NODE_USED;
+ }
+}
+
+/* Handle #undef. Mark the identifier NT_VOID in the hash table. */
+static void
+do_undef (cpp_reader *pfile)
+{
+ cpp_hashnode *node = lex_macro_node (pfile, true);
+
+ if (node)
+ {
+ if (pfile->cb.before_define)
+ pfile->cb.before_define (pfile);
+
+ if (pfile->cb.undef)
+ pfile->cb.undef (pfile, pfile->directive_line, node);
+
+ /* 6.10.3.5 paragraph 2: [#undef] is ignored if the specified
+ identifier is not currently defined as a macro name. */
+ if (node->type == NT_MACRO)
+ {
+ if (node->flags & NODE_WARN)
+ cpp_error (pfile, CPP_DL_WARNING,
+ "undefining \"%s\"", NODE_NAME (node));
+
+ if (CPP_OPTION (pfile, warn_unused_macros))
+ _cpp_warn_if_unused_macro (pfile, node, NULL);
+
+ _cpp_free_definition (node);
+ }
+ }
+
+ check_eol (pfile, false);
+}
+
+/* Undefine a single macro/assertion/whatever. */
+
+static int
+undefine_macros (cpp_reader *pfile ATTRIBUTE_UNUSED, cpp_hashnode *h,
+ void *data_p ATTRIBUTE_UNUSED)
+{
+ /* Body of _cpp_free_definition inlined here for speed.
+ Macros and assertions no longer have anything to free. */
+ h->type = NT_VOID;
+ h->flags &= ~(NODE_POISONED|NODE_BUILTIN|NODE_DISABLED|NODE_USED);
+ return 1;
+}
+
+/* Undefine all macros and assertions. */
+
+void
+cpp_undef_all (cpp_reader *pfile)
+{
+ cpp_forall_identifiers (pfile, undefine_macros, NULL);
+}
+
+
+/* Helper routine used by parse_include. Reinterpret the current line
+ as an h-char-sequence (< ... >); we are looking at the first token
+ after the <. Returns a malloced filename. */
+static char *
+glue_header_name (cpp_reader *pfile)
+{
+ const cpp_token *token;
+ char *buffer;
+ size_t len, total_len = 0, capacity = 1024;
+
+ /* To avoid lexed tokens overwriting our glued name, we can only
+ allocate from the string pool once we've lexed everything. */
+ buffer = XNEWVEC (char, capacity);
+ for (;;)
+ {
+ token = get_token_no_padding (pfile);
+
+ if (token->type == CPP_GREATER)
+ break;
+ if (token->type == CPP_EOF)
+ {
+ cpp_error (pfile, CPP_DL_ERROR, "missing terminating > character");
+ break;
+ }
+
+ len = cpp_token_len (token) + 2; /* Leading space, terminating \0. */
+ if (total_len + len > capacity)
+ {
+ capacity = (capacity + len) * 2;
+ buffer = XRESIZEVEC (char, buffer, capacity);
+ }
+
+ if (token->flags & PREV_WHITE)
+ buffer[total_len++] = ' ';
+
+ total_len = (cpp_spell_token (pfile, token, (uchar *) &buffer[total_len],
+ true)
+ - (uchar *) buffer);
+ }
+
+ buffer[total_len] = '\0';
+ return buffer;
+}
+
+/* Returns the file name of #include, #include_next, #import and
+ #pragma dependency. The string is malloced and the caller should
+ free it. Returns NULL on error. LOCATION is the source location
+ of the file name. */
+
+static const char *
+parse_include (cpp_reader *pfile, int *pangle_brackets,
+ const cpp_token ***buf, source_location *location)
+{
+ char *fname;
+ const cpp_token *header;
+
+ /* Allow macro expansion. */
+ header = get_token_no_padding (pfile);
+ *location = header->src_loc;
+ if ((header->type == CPP_STRING && header->val.str.text[0] != 'R')
+ || header->type == CPP_HEADER_NAME)
+ {
+ fname = XNEWVEC (char, header->val.str.len - 1);
+ memcpy (fname, header->val.str.text + 1, header->val.str.len - 2);
+ fname[header->val.str.len - 2] = '\0';
+ *pangle_brackets = header->type == CPP_HEADER_NAME;
+ }
+ else if (header->type == CPP_LESS)
+ {
+ fname = glue_header_name (pfile);
+ *pangle_brackets = 1;
+ }
+ else
+ {
+ const unsigned char *dir;
+
+ if (pfile->directive == &dtable[T_PRAGMA])
+ dir = UC"pragma dependency";
+ else
+ dir = pfile->directive->name;
+ cpp_error (pfile, CPP_DL_ERROR, "#%s expects \"FILENAME\" or <FILENAME>",
+ dir);
+
+ return NULL;
+ }
+
+ if (pfile->directive == &dtable[T_PRAGMA])
+ {
+ /* This pragma allows extra tokens after the file name. */
+ }
+ else if (buf == NULL || CPP_OPTION (pfile, discard_comments))
+ check_eol (pfile, true);
+ else
+ {
+ /* If we are not discarding comments, then gather them while
+ doing the eol check. */
+ *buf = check_eol_return_comments (pfile);
+ }
+
+ return fname;
+}
+
+/* Handle #include, #include_next and #import. */
+static void
+do_include_common (cpp_reader *pfile, enum include_type type)
+{
+ const char *fname;
+ int angle_brackets;
+ const cpp_token **buf = NULL;
+ source_location location;
+
+ /* Re-enable saving of comments if requested, so that the include
+ callback can dump comments which follow #include. */
+ pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments);
+
+ fname = parse_include (pfile, &angle_brackets, &buf, &location);
+ if (!fname)
+ {
+ if (buf)
+ XDELETEVEC (buf);
+ return;
+ }
+
+ if (!*fname)
+ {
+ cpp_error_with_line (pfile, CPP_DL_ERROR, location, 0,
+ "empty filename in #%s",
+ pfile->directive->name);
+ XDELETEVEC (fname);
+ if (buf)
+ XDELETEVEC (buf);
+ return;
+ }
+
+ /* Prevent #include recursion. */
+ if (pfile->line_table->depth >= CPP_STACK_MAX)
+ cpp_error (pfile, CPP_DL_ERROR, "#include nested too deeply");
+ else
+ {
+ /* Get out of macro context, if we are. */
+ skip_rest_of_line (pfile);
+
+ if (pfile->cb.include)
+ pfile->cb.include (pfile, pfile->directive_line,
+ pfile->directive->name, fname, angle_brackets,
+ buf);
+
+ _cpp_stack_include (pfile, fname, angle_brackets, type);
+ }
+
+ XDELETEVEC (fname);
+ if (buf)
+ XDELETEVEC (buf);
+}
+
+static void
+do_include (cpp_reader *pfile)
+{
+ do_include_common (pfile, IT_INCLUDE);
+}
+
+static void
+do_import (cpp_reader *pfile)
+{
+ do_include_common (pfile, IT_IMPORT);
+}
+
+static void
+do_include_next (cpp_reader *pfile)
+{
+ enum include_type type = IT_INCLUDE_NEXT;
+
+ /* If this is the primary source file, warn and use the normal
+ search logic. */
+ if (cpp_in_primary_file (pfile))
+ {
+ cpp_error (pfile, CPP_DL_WARNING,
+ "#include_next in primary source file");
+ type = IT_INCLUDE;
+ }
+ do_include_common (pfile, type);
+}
+
+/* Subroutine of do_linemarker. Read possible flags after file name.
+ LAST is the last flag seen; 0 if this is the first flag. Return the
+ flag if it is valid, 0 at the end of the directive. Otherwise
+ complain. */
+static unsigned int
+read_flag (cpp_reader *pfile, unsigned int last)
+{
+ const cpp_token *token = _cpp_lex_token (pfile);
+
+ if (token->type == CPP_NUMBER && token->val.str.len == 1)
+ {
+ unsigned int flag = token->val.str.text[0] - '0';
+
+ if (flag > last && flag <= 4
+ && (flag != 4 || last == 3)
+ && (flag != 2 || last == 0))
+ return flag;
+ }
+
+ if (token->type != CPP_EOF)
+ cpp_error (pfile, CPP_DL_ERROR, "invalid flag \"%s\" in line directive",
+ cpp_token_as_text (pfile, token));
+ return 0;
+}
+
+/* Subroutine of do_line and do_linemarker. Convert a number in STR,
+ of length LEN, to binary; store it in NUMP, and return false if the
+ number was well-formed, true if not. WRAPPED is set to true if the
+ number did not fit into 'unsigned long'. */
+static bool
+strtolinenum (const uchar *str, size_t len, linenum_type *nump, bool *wrapped)
+{
+ linenum_type reg = 0;
+ linenum_type reg_prev = 0;
+
+ uchar c;
+ *wrapped = false;
+ while (len--)
+ {
+ c = *str++;
+ if (!ISDIGIT (c))
+ return true;
+ reg *= 10;
+ reg += c - '0';
+ if (reg < reg_prev)
+ *wrapped = true;
+ reg_prev = reg;
+ }
+ *nump = reg;
+ return false;
+}
+
+/* Interpret #line command.
+ Note that the filename string (if any) is a true string constant
+ (escapes are interpreted), unlike in #line. */
+static void
+do_line (cpp_reader *pfile)
+{
+ const struct line_maps *line_table = pfile->line_table;
+ const struct line_map *map = &line_table->maps[line_table->used - 1];
+
+ /* skip_rest_of_line() may cause line table to be realloc()ed so note down
+ sysp right now. */
+
+ unsigned char map_sysp = map->sysp;
+ const cpp_token *token;
+ const char *new_file = map->to_file;
+ linenum_type new_lineno;
+
+ /* C99 raised the minimum limit on #line numbers. */
+ linenum_type cap = CPP_OPTION (pfile, c99) ? 2147483647 : 32767;
+ bool wrapped;
+
+ /* #line commands expand macros. */
+ token = cpp_get_token (pfile);
+ if (token->type != CPP_NUMBER
+ || strtolinenum (token->val.str.text, token->val.str.len,
+ &new_lineno, &wrapped))
+ {
+ if (token->type == CPP_EOF)
+ cpp_error (pfile, CPP_DL_ERROR, "unexpected end of file after #line");
+ else
+ cpp_error (pfile, CPP_DL_ERROR,
+ "\"%s\" after #line is not a positive integer",
+ cpp_token_as_text (pfile, token));
+ return;
+ }
+
+ if (CPP_PEDANTIC (pfile) && (new_lineno == 0 || new_lineno > cap || wrapped))
+ cpp_error (pfile, CPP_DL_PEDWARN, "line number out of range");
+ else if (wrapped)
+ cpp_error (pfile, CPP_DL_WARNING, "line number out of range");
+
+ token = cpp_get_token (pfile);
+ if (token->type == CPP_STRING)
+ {
+ cpp_string s = { 0, 0 };
+ if (cpp_interpret_string_notranslate (pfile, &token->val.str, 1,
+ &s, CPP_STRING))
+ new_file = (const char *)s.text;
+ check_eol (pfile, true);
+ }
+ else if (token->type != CPP_EOF)
+ {
+ cpp_error (pfile, CPP_DL_ERROR, "\"%s\" is not a valid filename",
+ cpp_token_as_text (pfile, token));
+ return;
+ }
+
+ skip_rest_of_line (pfile);
+ _cpp_do_file_change (pfile, LC_RENAME_VERBATIM, new_file, new_lineno,
+ map_sysp);
+}
+
+/* Interpret the # 44 "file" [flags] notation, which has slightly
+ different syntax and semantics from #line: Flags are allowed,
+ and we never complain about the line number being too big. */
+static void
+do_linemarker (cpp_reader *pfile)
+{
+ const struct line_maps *line_table = pfile->line_table;
+ const struct line_map *map = &line_table->maps[line_table->used - 1];
+ const cpp_token *token;
+ const char *new_file = map->to_file;
+ linenum_type new_lineno;
+ unsigned int new_sysp = map->sysp;
+ enum lc_reason reason = LC_RENAME_VERBATIM;
+ int flag;
+ bool wrapped;
+
+ /* Back up so we can get the number again. Putting this in
+ _cpp_handle_directive risks two calls to _cpp_backup_tokens in
+ some circumstances, which can segfault. */
+ _cpp_backup_tokens (pfile, 1);
+
+ /* #line commands expand macros. */
+ token = cpp_get_token (pfile);
+ if (token->type != CPP_NUMBER
+ || strtolinenum (token->val.str.text, token->val.str.len,
+ &new_lineno, &wrapped))
+ {
+ /* Unlike #line, there does not seem to be a way to get an EOF
+ here. So, it should be safe to always spell the token. */
+ cpp_error (pfile, CPP_DL_ERROR,
+ "\"%s\" after # is not a positive integer",
+ cpp_token_as_text (pfile, token));
+ return;
+ }
+
+ token = cpp_get_token (pfile);
+ if (token->type == CPP_STRING)
+ {
+ cpp_string s = { 0, 0 };
+ if (cpp_interpret_string_notranslate (pfile, &token->val.str,
+ 1, &s, CPP_STRING))
+ new_file = (const char *)s.text;
+
+ new_sysp = 0;
+ flag = read_flag (pfile, 0);
+ if (flag == 1)
+ {
+ reason = LC_ENTER;
+ /* Fake an include for cpp_included (). */
+ _cpp_fake_include (pfile, new_file);
+ flag = read_flag (pfile, flag);
+ }
+ else if (flag == 2)
+ {
+ reason = LC_LEAVE;
+ flag = read_flag (pfile, flag);
+ }
+ if (flag == 3)
+ {
+ new_sysp = 1;
+ flag = read_flag (pfile, flag);
+ if (flag == 4)
+ new_sysp = 2;
+ }
+ pfile->buffer->sysp = new_sysp;
+
+ check_eol (pfile, false);
+ }
+ else if (token->type != CPP_EOF)
+ {
+ cpp_error (pfile, CPP_DL_ERROR, "\"%s\" is not a valid filename",
+ cpp_token_as_text (pfile, token));
+ return;
+ }
+
+ skip_rest_of_line (pfile);
+
+ /* Compensate for the increment in linemap_add that occurs in
+ _cpp_do_file_change. We're currently at the start of the line
+ *following* the #line directive. A separate source_location for this
+ location makes no sense (until we do the LC_LEAVE), and
+ complicates LAST_SOURCE_LINE_LOCATION. */
+ pfile->line_table->highest_location--;
+
+ _cpp_do_file_change (pfile, reason, new_file, new_lineno, new_sysp);
+}
+
+/* Arrange the file_change callback. pfile->line has changed to
+ FILE_LINE of TO_FILE, for reason REASON. SYSP is 1 for a system
+ header, 2 for a system header that needs to be extern "C" protected,
+ and zero otherwise. */
+void
+_cpp_do_file_change (cpp_reader *pfile, enum lc_reason reason,
+ const char *to_file, linenum_type file_line,
+ unsigned int sysp)
+{
+ const struct line_map *map = linemap_add (pfile->line_table, reason, sysp,
+ to_file, file_line);
+ if (map != NULL)
+ linemap_line_start (pfile->line_table, map->to_line, 127);
+
+ if (pfile->cb.file_change)
+ pfile->cb.file_change (pfile, map);
+}
+
+/* Report a warning or error detected by the program we are
+ processing. Use the directive's tokens in the error message. */
+static void
+do_diagnostic (cpp_reader *pfile, int code, int reason, int print_dir)
+{
+ const unsigned char *dir_name;
+ unsigned char *line;
+ source_location src_loc = pfile->cur_token[-1].src_loc;
+
+ if (print_dir)
+ dir_name = pfile->directive->name;
+ else
+ dir_name = NULL;
+ pfile->state.prevent_expansion++;
+ line = cpp_output_line_to_string (pfile, dir_name);
+ pfile->state.prevent_expansion--;
+
+ if (code == CPP_DL_WARNING_SYSHDR && reason)
+ cpp_warning_with_line_syshdr (pfile, reason, src_loc, 0, "%s", line);
+ else if (code == CPP_DL_WARNING && reason)
+ cpp_warning_with_line (pfile, reason, src_loc, 0, "%s", line);
+ else
+ cpp_error_with_line (pfile, code, src_loc, 0, "%s", line);
+ free (line);
+}
+
+static void
+do_error (cpp_reader *pfile)
+{
+ do_diagnostic (pfile, CPP_DL_ERROR, 0, 1);
+}
+
+static void
+do_warning (cpp_reader *pfile)
+{
+ /* We want #warning diagnostics to be emitted in system headers too. */
+ do_diagnostic (pfile, CPP_DL_WARNING_SYSHDR, CPP_W_WARNING_DIRECTIVE, 1);
+}
+
+/* Report program identification. */
+static void
+do_ident (cpp_reader *pfile)
+{
+ const cpp_token *str = cpp_get_token (pfile);
+
+ if (str->type != CPP_STRING)
+ cpp_error (pfile, CPP_DL_ERROR, "invalid #%s directive",
+ pfile->directive->name);
+ else if (pfile->cb.ident)
+ pfile->cb.ident (pfile, pfile->directive_line, &str->val.str);
+
+ check_eol (pfile, false);
+}
+
+/* Lookup a PRAGMA name in a singly-linked CHAIN. Returns the
+ matching entry, or NULL if none is found. The returned entry could
+ be the start of a namespace chain, or a pragma. */
+static struct pragma_entry *
+lookup_pragma_entry (struct pragma_entry *chain, const cpp_hashnode *pragma)
+{
+ while (chain && chain->pragma != pragma)
+ chain = chain->next;
+
+ return chain;
+}
+
+/* Create and insert a blank pragma entry at the beginning of a
+ singly-linked CHAIN. */
+static struct pragma_entry *
+new_pragma_entry (cpp_reader *pfile, struct pragma_entry **chain)
+{
+ struct pragma_entry *new_entry;
+
+ new_entry = (struct pragma_entry *)
+ _cpp_aligned_alloc (pfile, sizeof (struct pragma_entry));
+
+ memset (new_entry, 0, sizeof (struct pragma_entry));
+ new_entry->next = *chain;
+
+ *chain = new_entry;
+ return new_entry;
+}
+
+/* Register a pragma NAME in namespace SPACE. If SPACE is null, it
+ goes in the global namespace. */
+static struct pragma_entry *
+register_pragma_1 (cpp_reader *pfile, const char *space, const char *name,
+ bool allow_name_expansion)
+{
+ struct pragma_entry **chain = &pfile->pragmas;
+ struct pragma_entry *entry;
+ const cpp_hashnode *node;
+
+ if (space)
+ {
+ node = cpp_lookup (pfile, UC space, strlen (space));
+ entry = lookup_pragma_entry (*chain, node);
+ if (!entry)
+ {
+ entry = new_pragma_entry (pfile, chain);
+ entry->pragma = node;
+ entry->is_nspace = true;
+ entry->allow_expansion = allow_name_expansion;
+ }
+ else if (!entry->is_nspace)
+ goto clash;
+ else if (entry->allow_expansion != allow_name_expansion)
+ {
+ cpp_error (pfile, CPP_DL_ICE,
+ "registering pragmas in namespace \"%s\" with mismatched "
+ "name expansion", space);
+ return NULL;
+ }
+ chain = &entry->u.space;
+ }
+ else if (allow_name_expansion)
+ {
+ cpp_error (pfile, CPP_DL_ICE,
+ "registering pragma \"%s\" with name expansion "
+ "and no namespace", name);
+ return NULL;
+ }
+
+ /* Check for duplicates. */
+ node = cpp_lookup (pfile, UC name, strlen (name));
+ entry = lookup_pragma_entry (*chain, node);
+ if (entry == NULL)
+ {
+ entry = new_pragma_entry (pfile, chain);
+ entry->pragma = node;
+ return entry;
+ }
+
+ if (entry->is_nspace)
+ clash:
+ cpp_error (pfile, CPP_DL_ICE,
+ "registering \"%s\" as both a pragma and a pragma namespace",
+ NODE_NAME (node));
+ else if (space)
+ cpp_error (pfile, CPP_DL_ICE, "#pragma %s %s is already registered",
+ space, name);
+ else
+ cpp_error (pfile, CPP_DL_ICE, "#pragma %s is already registered", name);
+
+ return NULL;
+}
+
+/* Register a cpplib internal pragma SPACE NAME with HANDLER. */
+static void
+register_pragma_internal (cpp_reader *pfile, const char *space,
+ const char *name, pragma_cb handler)
+{
+ struct pragma_entry *entry;
+
+ entry = register_pragma_1 (pfile, space, name, false);
+ entry->is_internal = true;
+ entry->u.handler = handler;
+}
+
+/* Register a pragma NAME in namespace SPACE. If SPACE is null, it
+ goes in the global namespace. HANDLER is the handler it will call,
+ which must be non-NULL. If ALLOW_EXPANSION is set, allow macro
+ expansion while parsing pragma NAME. This function is exported
+ from libcpp. */
+void
+cpp_register_pragma (cpp_reader *pfile, const char *space, const char *name,
+ pragma_cb handler, bool allow_expansion)
+{
+ struct pragma_entry *entry;
+
+ if (!handler)
+ {
+ cpp_error (pfile, CPP_DL_ICE, "registering pragma with NULL handler");
+ return;
+ }
+
+ entry = register_pragma_1 (pfile, space, name, false);
+ if (entry)
+ {
+ entry->allow_expansion = allow_expansion;
+ entry->u.handler = handler;
+ }
+}
+
+/* Similarly, but create mark the pragma for deferred processing.
+ When found, a CPP_PRAGMA token will be insertted into the stream
+ with IDENT in the token->u.pragma slot. */
+void
+cpp_register_deferred_pragma (cpp_reader *pfile, const char *space,
+ const char *name, unsigned int ident,
+ bool allow_expansion, bool allow_name_expansion)
+{
+ struct pragma_entry *entry;
+
+ entry = register_pragma_1 (pfile, space, name, allow_name_expansion);
+ if (entry)
+ {
+ entry->is_deferred = true;
+ entry->allow_expansion = allow_expansion;
+ entry->u.ident = ident;
+ }
+}
+
+/* Register the pragmas the preprocessor itself handles. */
+void
+_cpp_init_internal_pragmas (cpp_reader *pfile)
+{
+ /* Pragmas in the global namespace. */
+ register_pragma_internal (pfile, 0, "once", do_pragma_once);
+ register_pragma_internal (pfile, 0, "push_macro", do_pragma_push_macro);
+ register_pragma_internal (pfile, 0, "pop_macro", do_pragma_pop_macro);
+
+ /* New GCC-specific pragmas should be put in the GCC namespace. */
+ register_pragma_internal (pfile, "GCC", "poison", do_pragma_poison);
+ register_pragma_internal (pfile, "GCC", "system_header",
+ do_pragma_system_header);
+ register_pragma_internal (pfile, "GCC", "dependency", do_pragma_dependency);
+}
+
+/* Return the number of registered pragmas in PE. */
+
+static int
+count_registered_pragmas (struct pragma_entry *pe)
+{
+ int ct = 0;
+ for (; pe != NULL; pe = pe->next)
+ {
+ if (pe->is_nspace)
+ ct += count_registered_pragmas (pe->u.space);
+ ct++;
+ }
+ return ct;
+}
+
+/* Save into SD the names of the registered pragmas referenced by PE,
+ and return a pointer to the next free space in SD. */
+
+static char **
+save_registered_pragmas (struct pragma_entry *pe, char **sd)
+{
+ for (; pe != NULL; pe = pe->next)
+ {
+ if (pe->is_nspace)
+ sd = save_registered_pragmas (pe->u.space, sd);
+ *sd++ = (char *) xmemdup (HT_STR (&pe->pragma->ident),
+ HT_LEN (&pe->pragma->ident),
+ HT_LEN (&pe->pragma->ident) + 1);
+ }
+ return sd;
+}
+
+/* Return a newly-allocated array which saves the names of the
+ registered pragmas. */
+
+char **
+_cpp_save_pragma_names (cpp_reader *pfile)
+{
+ int ct = count_registered_pragmas (pfile->pragmas);
+ char **result = XNEWVEC (char *, ct);
+ (void) save_registered_pragmas (pfile->pragmas, result);
+ return result;
+}
+
+/* Restore from SD the names of the registered pragmas referenced by PE,
+ and return a pointer to the next unused name in SD. */
+
+static char **
+restore_registered_pragmas (cpp_reader *pfile, struct pragma_entry *pe,
+ char **sd)
+{
+ for (; pe != NULL; pe = pe->next)
+ {
+ if (pe->is_nspace)
+ sd = restore_registered_pragmas (pfile, pe->u.space, sd);
+ pe->pragma = cpp_lookup (pfile, UC *sd, strlen (*sd));
+ free (*sd);
+ sd++;
+ }
+ return sd;
+}
+
+/* Restore the names of the registered pragmas from SAVED. */
+
+void
+_cpp_restore_pragma_names (cpp_reader *pfile, char **saved)
+{
+ (void) restore_registered_pragmas (pfile, pfile->pragmas, saved);
+ free (saved);
+}
+
+/* Pragmata handling. We handle some, and pass the rest on to the
+ front end. C99 defines three pragmas and says that no macro
+ expansion is to be performed on them; whether or not macro
+ expansion happens for other pragmas is implementation defined.
+ This implementation allows for a mix of both, since GCC did not
+ traditionally macro expand its (few) pragmas, whereas OpenMP
+ specifies that macro expansion should happen. */
+static void
+do_pragma (cpp_reader *pfile)
+{
+ const struct pragma_entry *p = NULL;
+ const cpp_token *token, *pragma_token = pfile->cur_token;
+ cpp_token ns_token;
+ unsigned int count = 1;
+
+ pfile->state.prevent_expansion++;
+
+ token = cpp_get_token (pfile);
+ ns_token = *token;
+ if (token->type == CPP_NAME)
+ {
+ p = lookup_pragma_entry (pfile->pragmas, token->val.node.node);
+ if (p && p->is_nspace)
+ {
+ bool allow_name_expansion = p->allow_expansion;
+ if (allow_name_expansion)
+ pfile->state.prevent_expansion--;
+ token = cpp_get_token (pfile);
+ if (token->type == CPP_NAME)
+ p = lookup_pragma_entry (p->u.space, token->val.node.node);
+ else
+ p = NULL;
+ if (allow_name_expansion)
+ pfile->state.prevent_expansion++;
+ count = 2;
+ }
+ }
+
+ if (p)
+ {
+ if (p->is_deferred)
+ {
+ pfile->directive_result.src_loc = pragma_token->src_loc;
+ pfile->directive_result.type = CPP_PRAGMA;
+ pfile->directive_result.flags = pragma_token->flags;
+ pfile->directive_result.val.pragma = p->u.ident;
+ pfile->state.in_deferred_pragma = true;
+ pfile->state.pragma_allow_expansion = p->allow_expansion;
+ if (!p->allow_expansion)
+ pfile->state.prevent_expansion++;
+ }
+ else
+ {
+ /* Since the handler below doesn't get the line number, that
+ it might need for diagnostics, make sure it has the right
+ numbers in place. */
+ if (pfile->cb.line_change)
+ (*pfile->cb.line_change) (pfile, pragma_token, false);
+ if (p->allow_expansion)
+ pfile->state.prevent_expansion--;
+ (*p->u.handler) (pfile);
+ if (p->allow_expansion)
+ pfile->state.prevent_expansion++;
+ }
+ }
+ else if (pfile->cb.def_pragma)
+ {
+ if (count == 1 || pfile->context->prev == NULL)
+ _cpp_backup_tokens (pfile, count);
+ else
+ {
+ /* Invalid name comes from macro expansion, _cpp_backup_tokens
+ won't allow backing 2 tokens. */
+ /* ??? The token buffer is leaked. Perhaps if def_pragma hook
+ reads both tokens, we could perhaps free it, but if it doesn't,
+ we don't know the exact lifespan. */
+ cpp_token *toks = XNEWVEC (cpp_token, 2);
+ toks[0] = ns_token;
+ toks[0].flags |= NO_EXPAND;
+ toks[1] = *token;
+ toks[1].flags |= NO_EXPAND;
+ _cpp_push_token_context (pfile, NULL, toks, 2);
+ }
+ pfile->cb.def_pragma (pfile, pfile->directive_line);
+ }
+
+ pfile->state.prevent_expansion--;
+}
+
+/* Handle #pragma once. */
+static void
+do_pragma_once (cpp_reader *pfile)
+{
+ if (cpp_in_primary_file (pfile))
+ cpp_error (pfile, CPP_DL_WARNING, "#pragma once in main file");
+
+ check_eol (pfile, false);
+ _cpp_mark_file_once_only (pfile, pfile->buffer->file);
+}
+
+/* Handle #pragma push_macro(STRING). */
+static void
+do_pragma_push_macro (cpp_reader *pfile)
+{
+ cpp_hashnode *node;
+ size_t defnlen;
+ const uchar *defn = NULL;
+ char *macroname, *dest;
+ const char *limit, *src;
+ const cpp_token *txt;
+ struct def_pragma_macro *c;
+
+ txt = get__Pragma_string (pfile);
+ if (!txt)
+ {
+ source_location src_loc = pfile->cur_token[-1].src_loc;
+ cpp_error_with_line (pfile, CPP_DL_ERROR, src_loc, 0,
+ "invalid #pragma push_macro directive");
+ check_eol (pfile, false);
+ skip_rest_of_line (pfile);
+ return;
+ }
+ dest = macroname = (char *) alloca (txt->val.str.len + 2);
+ src = (const char *) (txt->val.str.text + 1 + (txt->val.str.text[0] == 'L'));
+ limit = (const char *) (txt->val.str.text + txt->val.str.len - 1);
+ while (src < limit)
+ {
+ /* We know there is a character following the backslash. */
+ if (*src == '\\' && (src[1] == '\\' || src[1] == '"'))
+ src++;
+ *dest++ = *src++;
+ }
+ *dest = 0;
+ check_eol (pfile, false);
+ skip_rest_of_line (pfile);
+ c = XNEW (struct def_pragma_macro);
+ memset (c, 0, sizeof (struct def_pragma_macro));
+ c->name = XNEWVAR (char, strlen (macroname) + 1);
+ strcpy (c->name, macroname);
+ c->next = pfile->pushed_macros;
+ node = _cpp_lex_identifier (pfile, c->name);
+ if (node->type == NT_VOID)
+ c->is_undef = 1;
+ else
+ {
+ defn = cpp_macro_definition (pfile, node);
+ defnlen = ustrlen (defn);
+ c->definition = XNEWVEC (uchar, defnlen + 2);
+ c->definition[defnlen] = '\n';
+ c->definition[defnlen + 1] = 0;
+ c->line = node->value.macro->line;
+ c->syshdr = node->value.macro->syshdr;
+ c->used = node->value.macro->used;
+ memcpy (c->definition, defn, defnlen);
+ }
+
+ pfile->pushed_macros = c;
+}
+
+/* Handle #pragma pop_macro(STRING). */
+static void
+do_pragma_pop_macro (cpp_reader *pfile)
+{
+ char *macroname, *dest;
+ const char *limit, *src;
+ const cpp_token *txt;
+ struct def_pragma_macro *l = NULL, *c = pfile->pushed_macros;
+ txt = get__Pragma_string (pfile);
+ if (!txt)
+ {
+ source_location src_loc = pfile->cur_token[-1].src_loc;
+ cpp_error_with_line (pfile, CPP_DL_ERROR, src_loc, 0,
+ "invalid #pragma pop_macro directive");
+ check_eol (pfile, false);
+ skip_rest_of_line (pfile);
+ return;
+ }
+ dest = macroname = (char *) alloca (txt->val.str.len + 2);
+ src = (const char *) (txt->val.str.text + 1 + (txt->val.str.text[0] == 'L'));
+ limit = (const char *) (txt->val.str.text + txt->val.str.len - 1);
+ while (src < limit)
+ {
+ /* We know there is a character following the backslash. */
+ if (*src == '\\' && (src[1] == '\\' || src[1] == '"'))
+ src++;
+ *dest++ = *src++;
+ }
+ *dest = 0;
+ check_eol (pfile, false);
+ skip_rest_of_line (pfile);
+
+ while (c != NULL)
+ {
+ if (!strcmp (c->name, macroname))
+ {
+ if (!l)
+ pfile->pushed_macros = c->next;
+ else
+ l->next = c->next;
+ cpp_pop_definition (pfile, c);
+ free (c->definition);
+ free (c->name);
+ free (c);
+ break;
+ }
+ l = c;
+ c = c->next;
+ }
+}
+
+/* Handle #pragma GCC poison, to poison one or more identifiers so
+ that the lexer produces a hard error for each subsequent usage. */
+static void
+do_pragma_poison (cpp_reader *pfile)
+{
+ const cpp_token *tok;
+ cpp_hashnode *hp;
+
+ pfile->state.poisoned_ok = 1;
+ for (;;)
+ {
+ tok = _cpp_lex_token (pfile);
+ if (tok->type == CPP_EOF)
+ break;
+ if (tok->type != CPP_NAME)
+ {
+ cpp_error (pfile, CPP_DL_ERROR,
+ "invalid #pragma GCC poison directive");
+ break;
+ }
+
+ hp = tok->val.node.node;
+ if (hp->flags & NODE_POISONED)
+ continue;
+
+ if (hp->type == NT_MACRO)
+ cpp_error (pfile, CPP_DL_WARNING, "poisoning existing macro \"%s\"",
+ NODE_NAME (hp));
+ _cpp_free_definition (hp);
+ hp->flags |= NODE_POISONED | NODE_DIAGNOSTIC;
+ }
+ pfile->state.poisoned_ok = 0;
+}
+
+/* Mark the current header as a system header. This will suppress
+ some categories of warnings (notably those from -pedantic). It is
+ intended for use in system libraries that cannot be implemented in
+ conforming C, but cannot be certain that their headers appear in a
+ system include directory. To prevent abuse, it is rejected in the
+ primary source file. */
+static void
+do_pragma_system_header (cpp_reader *pfile)
+{
+ if (cpp_in_primary_file (pfile))
+ cpp_error (pfile, CPP_DL_WARNING,
+ "#pragma system_header ignored outside include file");
+ else
+ {
+ check_eol (pfile, false);
+ skip_rest_of_line (pfile);
+ cpp_make_system_header (pfile, 1, 0);
+ }
+}
+
+/* Check the modified date of the current include file against a specified
+ file. Issue a diagnostic, if the specified file is newer. We use this to
+ determine if a fixed header should be refixed. */
+static void
+do_pragma_dependency (cpp_reader *pfile)
+{
+ const char *fname;
+ int angle_brackets, ordering;
+ source_location location;
+
+ fname = parse_include (pfile, &angle_brackets, NULL, &location);
+ if (!fname)
+ return;
+
+ ordering = _cpp_compare_file_date (pfile, fname, angle_brackets);
+ if (ordering < 0)
+ cpp_error (pfile, CPP_DL_WARNING, "cannot find source file %s", fname);
+ else if (ordering > 0)
+ {
+ cpp_error (pfile, CPP_DL_WARNING,
+ "current file is older than %s", fname);
+ if (cpp_get_token (pfile)->type != CPP_EOF)
+ {
+ _cpp_backup_tokens (pfile, 1);
+ do_diagnostic (pfile, CPP_DL_WARNING, 0, 0);
+ }
+ }
+
+ free ((void *) fname);
+}
+
+/* Get a token but skip padding. */
+static const cpp_token *
+get_token_no_padding (cpp_reader *pfile)
+{
+ for (;;)
+ {
+ const cpp_token *result = cpp_get_token (pfile);
+ if (result->type != CPP_PADDING)
+ return result;
+ }
+}
+
+/* Check syntax is "(string-literal)". Returns the string on success,
+ or NULL on failure. */
+static const cpp_token *
+get__Pragma_string (cpp_reader *pfile)
+{
+ const cpp_token *string;
+ const cpp_token *paren;
+
+ paren = get_token_no_padding (pfile);
+ if (paren->type == CPP_EOF)
+ _cpp_backup_tokens (pfile, 1);
+ if (paren->type != CPP_OPEN_PAREN)
+ return NULL;
+
+ string = get_token_no_padding (pfile);
+ if (string->type == CPP_EOF)
+ _cpp_backup_tokens (pfile, 1);
+ if (string->type != CPP_STRING && string->type != CPP_WSTRING
+ && string->type != CPP_STRING32 && string->type != CPP_STRING16
+ && string->type != CPP_UTF8STRING)
+ return NULL;
+
+ paren = get_token_no_padding (pfile);
+ if (paren->type == CPP_EOF)
+ _cpp_backup_tokens (pfile, 1);
+ if (paren->type != CPP_CLOSE_PAREN)
+ return NULL;
+
+ return string;
+}
+
+/* Destringize IN into a temporary buffer, by removing the first \ of
+ \" and \\ sequences, and process the result as a #pragma directive. */
+static void
+destringize_and_run (cpp_reader *pfile, const cpp_string *in)
+{
+ const unsigned char *src, *limit;
+ char *dest, *result;
+ cpp_context *saved_context;
+ cpp_token *saved_cur_token;
+ tokenrun *saved_cur_run;
+ cpp_token *toks;
+ int count;
+ const struct directive *save_directive;
+
+ dest = result = (char *) alloca (in->len - 1);
+ src = in->text + 1 + (in->text[0] == 'L');
+ limit = in->text + in->len - 1;
+ while (src < limit)
+ {
+ /* We know there is a character following the backslash. */
+ if (*src == '\\' && (src[1] == '\\' || src[1] == '"'))
+ src++;
+ *dest++ = *src++;
+ }
+ *dest = '\n';
+
+ /* Ugh; an awful kludge. We are really not set up to be lexing
+ tokens when in the middle of a macro expansion. Use a new
+ context to force cpp_get_token to lex, and so skip_rest_of_line
+ doesn't go beyond the end of the text. Also, remember the
+ current lexing position so we can return to it later.
+
+ Something like line-at-a-time lexing should remove the need for
+ this. */
+ saved_context = pfile->context;
+ saved_cur_token = pfile->cur_token;
+ saved_cur_run = pfile->cur_run;
+
+ pfile->context = XNEW (cpp_context);
+ pfile->context->macro = 0;
+ pfile->context->prev = 0;
+ pfile->context->next = 0;
+
+ /* Inline run_directive, since we need to delay the _cpp_pop_buffer
+ until we've read all of the tokens that we want. */
+ cpp_push_buffer (pfile, (const uchar *) result, dest - result,
+ /* from_stage3 */ true);
+ /* ??? Antique Disgusting Hack. What does this do? */
+ if (pfile->buffer->prev)
+ pfile->buffer->file = pfile->buffer->prev->file;
+
+ start_directive (pfile);
+ _cpp_clean_line (pfile);
+ save_directive = pfile->directive;
+ pfile->directive = &dtable[T_PRAGMA];
+ do_pragma (pfile);
+ end_directive (pfile, 1);
+ pfile->directive = save_directive;
+
+ /* We always insert at least one token, the directive result. It'll
+ either be a CPP_PADDING or a CPP_PRAGMA. In the later case, we
+ need to insert *all* of the tokens, including the CPP_PRAGMA_EOL. */
+
+ /* If we're not handling the pragma internally, read all of the tokens from
+ the string buffer now, while the string buffer is still installed. */
+ /* ??? Note that the token buffer allocated here is leaked. It's not clear
+ to me what the true lifespan of the tokens are. It would appear that
+ the lifespan is the entire parse of the main input stream, in which case
+ this may not be wrong. */
+ if (pfile->directive_result.type == CPP_PRAGMA)
+ {
+ int maxcount;
+
+ count = 1;
+ maxcount = 50;
+ toks = XNEWVEC (cpp_token, maxcount);
+ toks[0] = pfile->directive_result;
+
+ do
+ {
+ if (count == maxcount)
+ {
+ maxcount = maxcount * 3 / 2;
+ toks = XRESIZEVEC (cpp_token, toks, maxcount);
+ }
+ toks[count] = *cpp_get_token (pfile);
+ /* Macros have been already expanded by cpp_get_token
+ if the pragma allowed expansion. */
+ toks[count++].flags |= NO_EXPAND;
+ }
+ while (toks[count-1].type != CPP_PRAGMA_EOL);
+ }
+ else
+ {
+ count = 1;
+ toks = XNEW (cpp_token);
+ toks[0] = pfile->directive_result;
+
+ /* If we handled the entire pragma internally, make sure we get the
+ line number correct for the next token. */
+ if (pfile->cb.line_change)
+ pfile->cb.line_change (pfile, pfile->cur_token, false);
+ }
+
+ /* Finish inlining run_directive. */
+ pfile->buffer->file = NULL;
+ _cpp_pop_buffer (pfile);
+
+ /* Reset the old macro state before ... */
+ XDELETE (pfile->context);
+ pfile->context = saved_context;
+ pfile->cur_token = saved_cur_token;
+ pfile->cur_run = saved_cur_run;
+
+ /* ... inserting the new tokens we collected. */
+ _cpp_push_token_context (pfile, NULL, toks, count);
+}
+
+/* Handle the _Pragma operator. Return 0 on error, 1 if ok. */
+int
+_cpp_do__Pragma (cpp_reader *pfile)
+{
+ const cpp_token *string = get__Pragma_string (pfile);
+ pfile->directive_result.type = CPP_PADDING;
+
+ if (string)
+ {
+ destringize_and_run (pfile, &string->val.str);
+ return 1;
+ }
+ cpp_error (pfile, CPP_DL_ERROR,
+ "_Pragma takes a parenthesized string literal");
+ return 0;
+}
+
+/* Handle #ifdef. */
+static void
+do_ifdef (cpp_reader *pfile)
+{
+ int skip = 1;
+
+ if (! pfile->state.skipping)
+ {
+ cpp_hashnode *node = lex_macro_node (pfile, false);
+
+ if (node)
+ {
+ /* Do not treat conditional macros as being defined. This is due to
+ the powerpc and spu ports using conditional macros for 'vector',
+ 'bool', and 'pixel' to act as conditional keywords. This messes
+ up tests like #ifndef bool. */
+ skip = (node->type != NT_MACRO
+ || ((node->flags & NODE_CONDITIONAL) != 0));
+ _cpp_mark_macro_used (node);
+ if (!(node->flags & NODE_USED))
+ {
+ node->flags |= NODE_USED;
+ if (node->type == NT_MACRO)
+ {
+ if ((node->flags & NODE_BUILTIN)
+ && pfile->cb.user_builtin_macro)
+ pfile->cb.user_builtin_macro (pfile, node);
+ if (pfile->cb.used_define)
+ pfile->cb.used_define (pfile, pfile->directive_line, node);
+ }
+ else
+ {
+ if (pfile->cb.used_undef)
+ pfile->cb.used_undef (pfile, pfile->directive_line, node);
+ }
+ }
+ if (pfile->cb.used)
+ pfile->cb.used (pfile, pfile->directive_line, node);
+ check_eol (pfile, false);
+ }
+ }
+
+ push_conditional (pfile, skip, T_IFDEF, 0);
+}
+
+/* Handle #ifndef. */
+static void
+do_ifndef (cpp_reader *pfile)
+{
+ int skip = 1;
+ cpp_hashnode *node = 0;
+
+ if (! pfile->state.skipping)
+ {
+ node = lex_macro_node (pfile, false);
+
+ if (node)
+ {
+ /* Do not treat conditional macros as being defined. This is due to
+ the powerpc and spu ports using conditional macros for 'vector',
+ 'bool', and 'pixel' to act as conditional keywords. This messes
+ up tests like #ifndef bool. */
+ skip = (node->type == NT_MACRO
+ && ((node->flags & NODE_CONDITIONAL) == 0));
+ _cpp_mark_macro_used (node);
+ if (!(node->flags & NODE_USED))
+ {
+ node->flags |= NODE_USED;
+ if (node->type == NT_MACRO)
+ {
+ if ((node->flags & NODE_BUILTIN)
+ && pfile->cb.user_builtin_macro)
+ pfile->cb.user_builtin_macro (pfile, node);
+ if (pfile->cb.used_define)
+ pfile->cb.used_define (pfile, pfile->directive_line, node);
+ }
+ else
+ {
+ if (pfile->cb.used_undef)
+ pfile->cb.used_undef (pfile, pfile->directive_line, node);
+ }
+ }
+ if (pfile->cb.used)
+ pfile->cb.used (pfile, pfile->directive_line, node);
+ check_eol (pfile, false);
+ }
+ }
+
+ push_conditional (pfile, skip, T_IFNDEF, node);
+}
+
+/* _cpp_parse_expr puts a macro in a "#if !defined ()" expression in
+ pfile->mi_ind_cmacro so we can handle multiple-include
+ optimizations. If macro expansion occurs in the expression, we
+ cannot treat it as a controlling conditional, since the expansion
+ could change in the future. That is handled by cpp_get_token. */
+static void
+do_if (cpp_reader *pfile)
+{
+ int skip = 1;
+
+ if (! pfile->state.skipping)
+ skip = _cpp_parse_expr (pfile, true) == false;
+
+ push_conditional (pfile, skip, T_IF, pfile->mi_ind_cmacro);
+}
+
+/* Flip skipping state if appropriate and continue without changing
+ if_stack; this is so that the error message for missing #endif's
+ etc. will point to the original #if. */
+static void
+do_else (cpp_reader *pfile)
+{
+ cpp_buffer *buffer = pfile->buffer;
+ struct if_stack *ifs = buffer->if_stack;
+
+ if (ifs == NULL)
+ cpp_error (pfile, CPP_DL_ERROR, "#else without #if");
+ else
+ {
+ if (ifs->type == T_ELSE)
+ {
+ cpp_error (pfile, CPP_DL_ERROR, "#else after #else");
+ cpp_error_with_line (pfile, CPP_DL_ERROR, ifs->line, 0,
+ "the conditional began here");
+ }
+ ifs->type = T_ELSE;
+
+ /* Skip any future (erroneous) #elses or #elifs. */
+ pfile->state.skipping = ifs->skip_elses;
+ ifs->skip_elses = true;
+
+ /* Invalidate any controlling macro. */
+ ifs->mi_cmacro = 0;
+
+ /* Only check EOL if was not originally skipping. */
+ if (!ifs->was_skipping && CPP_OPTION (pfile, warn_endif_labels))
+ check_eol (pfile, false);
+ }
+}
+
+/* Handle a #elif directive by not changing if_stack either. See the
+ comment above do_else. */
+static void
+do_elif (cpp_reader *pfile)
+{
+ cpp_buffer *buffer = pfile->buffer;
+ struct if_stack *ifs = buffer->if_stack;
+
+ if (ifs == NULL)
+ cpp_error (pfile, CPP_DL_ERROR, "#elif without #if");
+ else
+ {
+ if (ifs->type == T_ELSE)
+ {
+ cpp_error (pfile, CPP_DL_ERROR, "#elif after #else");
+ cpp_error_with_line (pfile, CPP_DL_ERROR, ifs->line, 0,
+ "the conditional began here");
+ }
+ ifs->type = T_ELIF;
+
+ if (! ifs->was_skipping)
+ {
+ bool value;
+ /* The standard mandates that the expression be parsed even
+ if we are skipping elses at this point -- the lexical
+ restrictions on #elif only apply to skipped groups, but
+ this group is not being skipped. Temporarily set
+ skipping to false to get lexer warnings. */
+ pfile->state.skipping = 0;
+ value = _cpp_parse_expr (pfile, false);
+ if (ifs->skip_elses)
+ pfile->state.skipping = 1;
+ else
+ {
+ pfile->state.skipping = ! value;
+ ifs->skip_elses = value;
+ }
+ }
+
+ /* Invalidate any controlling macro. */
+ ifs->mi_cmacro = 0;
+ }
+}
+
+/* #endif pops the if stack and resets pfile->state.skipping. */
+static void
+do_endif (cpp_reader *pfile)
+{
+ cpp_buffer *buffer = pfile->buffer;
+ struct if_stack *ifs = buffer->if_stack;
+
+ if (ifs == NULL)
+ cpp_error (pfile, CPP_DL_ERROR, "#endif without #if");
+ else
+ {
+ /* Only check EOL if was not originally skipping. */
+ if (!ifs->was_skipping && CPP_OPTION (pfile, warn_endif_labels))
+ check_eol (pfile, false);
+
+ /* If potential control macro, we go back outside again. */
+ if (ifs->next == 0 && ifs->mi_cmacro)
+ {
+ pfile->mi_valid = true;
+ pfile->mi_cmacro = ifs->mi_cmacro;
+ }
+
+ buffer->if_stack = ifs->next;
+ pfile->state.skipping = ifs->was_skipping;
+ obstack_free (&pfile->buffer_ob, ifs);
+ }
+}
+
+/* Push an if_stack entry for a preprocessor conditional, and set
+ pfile->state.skipping to SKIP. If TYPE indicates the conditional
+ is #if or #ifndef, CMACRO is a potentially controlling macro, and
+ we need to check here that we are at the top of the file. */
+static void
+push_conditional (cpp_reader *pfile, int skip, int type,
+ const cpp_hashnode *cmacro)
+{
+ struct if_stack *ifs;
+ cpp_buffer *buffer = pfile->buffer;
+
+ ifs = XOBNEW (&pfile->buffer_ob, struct if_stack);
+ ifs->line = pfile->directive_line;
+ ifs->next = buffer->if_stack;
+ ifs->skip_elses = pfile->state.skipping || !skip;
+ ifs->was_skipping = pfile->state.skipping;
+ ifs->type = type;
+ /* This condition is effectively a test for top-of-file. */
+ if (pfile->mi_valid && pfile->mi_cmacro == 0)
+ ifs->mi_cmacro = cmacro;
+ else
+ ifs->mi_cmacro = 0;
+
+ pfile->state.skipping = skip;
+ buffer->if_stack = ifs;
+}
+
+/* Read the tokens of the answer into the macro pool, in a directive
+ of type TYPE. Only commit the memory if we intend it as permanent
+ storage, i.e. the #assert case. Returns 0 on success, and sets
+ ANSWERP to point to the answer. PRED_LOC is the location of the
+ predicate. */
+static int
+parse_answer (cpp_reader *pfile, struct answer **answerp, int type,
+ source_location pred_loc)
+{
+ const cpp_token *paren;
+ struct answer *answer;
+ unsigned int acount;
+
+ /* In a conditional, it is legal to not have an open paren. We
+ should save the following token in this case. */
+ paren = cpp_get_token (pfile);
+
+ /* If not a paren, see if we're OK. */
+ if (paren->type != CPP_OPEN_PAREN)
+ {
+ /* In a conditional no answer is a test for any answer. It
+ could be followed by any token. */
+ if (type == T_IF)
+ {
+ _cpp_backup_tokens (pfile, 1);
+ return 0;
+ }
+
+ /* #unassert with no answer is valid - it removes all answers. */
+ if (type == T_UNASSERT && paren->type == CPP_EOF)
+ return 0;
+
+ cpp_error_with_line (pfile, CPP_DL_ERROR, pred_loc, 0,
+ "missing '(' after predicate");
+ return 1;
+ }
+
+ for (acount = 0;; acount++)
+ {
+ size_t room_needed;
+ const cpp_token *token = cpp_get_token (pfile);
+ cpp_token *dest;
+
+ if (token->type == CPP_CLOSE_PAREN)
+ break;
+
+ if (token->type == CPP_EOF)
+ {
+ cpp_error (pfile, CPP_DL_ERROR, "missing ')' to complete answer");
+ return 1;
+ }
+
+ /* struct answer includes the space for one token. */
+ room_needed = (sizeof (struct answer) + acount * sizeof (cpp_token));
+
+ if (BUFF_ROOM (pfile->a_buff) < room_needed)
+ _cpp_extend_buff (pfile, &pfile->a_buff, sizeof (struct answer));
+
+ dest = &((struct answer *) BUFF_FRONT (pfile->a_buff))->first[acount];
+ *dest = *token;
+
+ /* Drop whitespace at start, for answer equivalence purposes. */
+ if (acount == 0)
+ dest->flags &= ~PREV_WHITE;
+ }
+
+ if (acount == 0)
+ {
+ cpp_error (pfile, CPP_DL_ERROR, "predicate's answer is empty");
+ return 1;
+ }
+
+ answer = (struct answer *) BUFF_FRONT (pfile->a_buff);
+ answer->count = acount;
+ answer->next = NULL;
+ *answerp = answer;
+
+ return 0;
+}
+
+/* Parses an assertion directive of type TYPE, returning a pointer to
+ the hash node of the predicate, or 0 on error. If an answer was
+ supplied, it is placed in ANSWERP, otherwise it is set to 0. */
+static cpp_hashnode *
+parse_assertion (cpp_reader *pfile, struct answer **answerp, int type)
+{
+ cpp_hashnode *result = 0;
+ const cpp_token *predicate;
+
+ /* We don't expand predicates or answers. */
+ pfile->state.prevent_expansion++;
+
+ *answerp = 0;
+ predicate = cpp_get_token (pfile);
+ if (predicate->type == CPP_EOF)
+ cpp_error (pfile, CPP_DL_ERROR, "assertion without predicate");
+ else if (predicate->type != CPP_NAME)
+ cpp_error_with_line (pfile, CPP_DL_ERROR, predicate->src_loc, 0,
+ "predicate must be an identifier");
+ else if (parse_answer (pfile, answerp, type, predicate->src_loc) == 0)
+ {
+ unsigned int len = NODE_LEN (predicate->val.node.node);
+ unsigned char *sym = (unsigned char *) alloca (len + 1);
+
+ /* Prefix '#' to get it out of macro namespace. */
+ sym[0] = '#';
+ memcpy (sym + 1, NODE_NAME (predicate->val.node.node), len);
+ result = cpp_lookup (pfile, sym, len + 1);
+ }
+
+ pfile->state.prevent_expansion--;
+ return result;
+}
+
+/* Returns a pointer to the pointer to CANDIDATE in the answer chain,
+ or a pointer to NULL if the answer is not in the chain. */
+static struct answer **
+find_answer (cpp_hashnode *node, const struct answer *candidate)
+{
+ unsigned int i;
+ struct answer **result;
+
+ for (result = &node->value.answers; *result; result = &(*result)->next)
+ {
+ struct answer *answer = *result;
+
+ if (answer->count == candidate->count)
+ {
+ for (i = 0; i < answer->count; i++)
+ if (! _cpp_equiv_tokens (&answer->first[i], &candidate->first[i]))
+ break;
+
+ if (i == answer->count)
+ break;
+ }
+ }
+
+ return result;
+}
+
+/* Test an assertion within a preprocessor conditional. Returns
+ nonzero on failure, zero on success. On success, the result of
+ the test is written into VALUE, otherwise the value 0. */
+int
+_cpp_test_assertion (cpp_reader *pfile, unsigned int *value)
+{
+ struct answer *answer;
+ cpp_hashnode *node;
+
+ node = parse_assertion (pfile, &answer, T_IF);
+
+ /* For recovery, an erroneous assertion expression is handled as a
+ failing assertion. */
+ *value = 0;
+
+ if (node)
+ *value = (node->type == NT_ASSERTION &&
+ (answer == 0 || *find_answer (node, answer) != 0));
+ else if (pfile->cur_token[-1].type == CPP_EOF)
+ _cpp_backup_tokens (pfile, 1);
+
+ /* We don't commit the memory for the answer - it's temporary only. */
+ return node == 0;
+}
+
+/* Handle #assert. */
+static void
+do_assert (cpp_reader *pfile)
+{
+ struct answer *new_answer;
+ cpp_hashnode *node;
+
+ node = parse_assertion (pfile, &new_answer, T_ASSERT);
+ if (node)
+ {
+ size_t answer_size;
+
+ /* Place the new answer in the answer list. First check there
+ is not a duplicate. */
+ new_answer->next = 0;
+ if (node->type == NT_ASSERTION)
+ {
+ if (*find_answer (node, new_answer))
+ {
+ cpp_error (pfile, CPP_DL_WARNING, "\"%s\" re-asserted",
+ NODE_NAME (node) + 1);
+ return;
+ }
+ new_answer->next = node->value.answers;
+ }
+
+ answer_size = sizeof (struct answer) + ((new_answer->count - 1)
+ * sizeof (cpp_token));
+ /* Commit or allocate storage for the object. */
+ if (pfile->hash_table->alloc_subobject)
+ {
+ struct answer *temp_answer = new_answer;
+ new_answer = (struct answer *) pfile->hash_table->alloc_subobject
+ (answer_size);
+ memcpy (new_answer, temp_answer, answer_size);
+ }
+ else
+ BUFF_FRONT (pfile->a_buff) += answer_size;
+
+ node->type = NT_ASSERTION;
+ node->value.answers = new_answer;
+ check_eol (pfile, false);
+ }
+}
+
+/* Handle #unassert. */
+static void
+do_unassert (cpp_reader *pfile)
+{
+ cpp_hashnode *node;
+ struct answer *answer;
+
+ node = parse_assertion (pfile, &answer, T_UNASSERT);
+ /* It isn't an error to #unassert something that isn't asserted. */
+ if (node && node->type == NT_ASSERTION)
+ {
+ if (answer)
+ {
+ struct answer **p = find_answer (node, answer), *temp;
+
+ /* Remove the answer from the list. */
+ temp = *p;
+ if (temp)
+ *p = temp->next;
+
+ /* Did we free the last answer? */
+ if (node->value.answers == 0)
+ node->type = NT_VOID;
+
+ check_eol (pfile, false);
+ }
+ else
+ _cpp_free_definition (node);
+ }
+
+ /* We don't commit the memory for the answer - it's temporary only. */
+}
+
+/* These are for -D, -U, -A. */
+
+/* Process the string STR as if it appeared as the body of a #define.
+ If STR is just an identifier, define it with value 1.
+ If STR has anything after the identifier, then it should
+ be identifier=definition. */
+void
+cpp_define (cpp_reader *pfile, const char *str)
+{
+ char *buf;
+ const char *p;
+ size_t count;
+
+ /* Copy the entire option so we can modify it.
+ Change the first "=" in the string to a space. If there is none,
+ tack " 1" on the end. */
+
+ count = strlen (str);
+ buf = (char *) alloca (count + 3);
+ memcpy (buf, str, count);
+
+ p = strchr (str, '=');
+ if (p)
+ buf[p - str] = ' ';
+ else
+ {
+ buf[count++] = ' ';
+ buf[count++] = '1';
+ }
+ buf[count] = '\n';
+
+ run_directive (pfile, T_DEFINE, buf, count);
+}
+
+
+/* Use to build macros to be run through cpp_define() as
+ described above.
+ Example: cpp_define_formatted (pfile, "MACRO=%d", value); */
+
+void
+cpp_define_formatted (cpp_reader *pfile, const char *fmt, ...)
+{
+ char *ptr = NULL;
+
+ va_list ap;
+ va_start (ap, fmt);
+ vasprintf (&ptr, fmt, ap);
+ va_end (ap);
+
+ cpp_define (pfile, ptr);
+ free (ptr);
+}
+
+
+/* Slight variant of the above for use by initialize_builtins. */
+void
+_cpp_define_builtin (cpp_reader *pfile, const char *str)
+{
+ size_t len = strlen (str);
+ char *buf = (char *) alloca (len + 1);
+ memcpy (buf, str, len);
+ buf[len] = '\n';
+ run_directive (pfile, T_DEFINE, buf, len);
+}
+
+/* Process MACRO as if it appeared as the body of an #undef. */
+void
+cpp_undef (cpp_reader *pfile, const char *macro)
+{
+ size_t len = strlen (macro);
+ char *buf = (char *) alloca (len + 1);
+ memcpy (buf, macro, len);
+ buf[len] = '\n';
+ run_directive (pfile, T_UNDEF, buf, len);
+}
+
+/* Replace a previous definition DEF of the macro STR. If DEF is NULL,
+ or first element is zero, then the macro should be undefined. */
+static void
+cpp_pop_definition (cpp_reader *pfile, struct def_pragma_macro *c)
+{
+ cpp_hashnode *node = _cpp_lex_identifier (pfile, c->name);
+ if (node == NULL)
+ return;
+
+ if (pfile->cb.before_define)
+ pfile->cb.before_define (pfile);
+
+ if (node->type == NT_MACRO)
+ {
+ if (pfile->cb.undef)
+ pfile->cb.undef (pfile, pfile->directive_line, node);
+ if (CPP_OPTION (pfile, warn_unused_macros))
+ _cpp_warn_if_unused_macro (pfile, node, NULL);
+ }
+ if (node->type != NT_VOID)
+ _cpp_free_definition (node);
+
+ if (c->is_undef)
+ return;
+ {
+ size_t namelen;
+ const uchar *dn;
+ cpp_hashnode *h = NULL;
+ cpp_buffer *nbuf;
+
+ namelen = ustrcspn (c->definition, "( \n");
+ h = cpp_lookup (pfile, c->definition, namelen);
+ dn = c->definition + namelen;
+
+ h->type = NT_VOID;
+ h->flags &= ~(NODE_POISONED|NODE_BUILTIN|NODE_DISABLED|NODE_USED);
+ nbuf = cpp_push_buffer (pfile, dn, ustrchr (dn, '\n') - dn, true);
+ if (nbuf != NULL)
+ {
+ _cpp_clean_line (pfile);
+ nbuf->sysp = 1;
+ if (!_cpp_create_definition (pfile, h))
+ abort ();
+ _cpp_pop_buffer (pfile);
+ }
+ else
+ abort ();
+ h->value.macro->line = c->line;
+ h->value.macro->syshdr = c->syshdr;
+ h->value.macro->used = c->used;
+ }
+}
+
+/* Process the string STR as if it appeared as the body of a #assert. */
+void
+cpp_assert (cpp_reader *pfile, const char *str)
+{
+ handle_assertion (pfile, str, T_ASSERT);
+}
+
+/* Process STR as if it appeared as the body of an #unassert. */
+void
+cpp_unassert (cpp_reader *pfile, const char *str)
+{
+ handle_assertion (pfile, str, T_UNASSERT);
+}
+
+/* Common code for cpp_assert (-A) and cpp_unassert (-A-). */
+static void
+handle_assertion (cpp_reader *pfile, const char *str, int type)
+{
+ size_t count = strlen (str);
+ const char *p = strchr (str, '=');
+
+ /* Copy the entire option so we can modify it. Change the first
+ "=" in the string to a '(', and tack a ')' on the end. */
+ char *buf = (char *) alloca (count + 2);
+
+ memcpy (buf, str, count);
+ if (p)
+ {
+ buf[p - str] = '(';
+ buf[count++] = ')';
+ }
+ buf[count] = '\n';
+ str = buf;
+
+ run_directive (pfile, type, str, count);
+}
+
+/* The options structure. */
+cpp_options *
+cpp_get_options (cpp_reader *pfile)
+{
+ return &pfile->opts;
+}
+
+/* The callbacks structure. */
+cpp_callbacks *
+cpp_get_callbacks (cpp_reader *pfile)
+{
+ return &pfile->cb;
+}
+
+/* Copy the given callbacks structure to our own. */
+void
+cpp_set_callbacks (cpp_reader *pfile, cpp_callbacks *cb)
+{
+ pfile->cb = *cb;
+}
+
+/* The dependencies structure. (Creates one if it hasn't already been.) */
+struct deps *
+cpp_get_deps (cpp_reader *pfile)
+{
+ if (!pfile->deps)
+ pfile->deps = deps_init ();
+ return pfile->deps;
+}
+
+/* Push a new buffer on the buffer stack. Returns the new buffer; it
+ doesn't fail. It does not generate a file change call back; that
+ is the responsibility of the caller. */
+cpp_buffer *
+cpp_push_buffer (cpp_reader *pfile, const uchar *buffer, size_t len,
+ int from_stage3)
+{
+ cpp_buffer *new_buffer = XOBNEW (&pfile->buffer_ob, cpp_buffer);
+
+ /* Clears, amongst other things, if_stack and mi_cmacro. */
+ memset (new_buffer, 0, sizeof (cpp_buffer));
+
+ new_buffer->next_line = new_buffer->buf = buffer;
+ new_buffer->rlimit = buffer + len;
+ new_buffer->from_stage3 = from_stage3;
+ new_buffer->prev = pfile->buffer;
+ new_buffer->need_line = true;
+
+ pfile->buffer = new_buffer;
+
+ return new_buffer;
+}
+
+/* Pops a single buffer, with a file change call-back if appropriate.
+ Then pushes the next -include file, if any remain. */
+void
+_cpp_pop_buffer (cpp_reader *pfile)
+{
+ cpp_buffer *buffer = pfile->buffer;
+ struct _cpp_file *inc = buffer->file;
+ struct if_stack *ifs;
+
+ /* Walk back up the conditional stack till we reach its level at
+ entry to this file, issuing error messages. */
+ for (ifs = buffer->if_stack; ifs; ifs = ifs->next)
+ cpp_error_with_line (pfile, CPP_DL_ERROR, ifs->line, 0,
+ "unterminated #%s", dtable[ifs->type].name);
+
+ /* In case of a missing #endif. */
+ pfile->state.skipping = 0;
+
+ /* _cpp_do_file_change expects pfile->buffer to be the new one. */
+ pfile->buffer = buffer->prev;
+
+ free (buffer->notes);
+
+ /* Free the buffer object now; we may want to push a new buffer
+ in _cpp_push_next_include_file. */
+ obstack_free (&pfile->buffer_ob, buffer);
+
+ if (inc)
+ {
+ _cpp_pop_file_buffer (pfile, inc);
+
+ _cpp_do_file_change (pfile, LC_LEAVE, 0, 0, 0);
+ }
+}
+
+/* Enter all recognized directives in the hash table. */
+void
+_cpp_init_directives (cpp_reader *pfile)
+{
+ unsigned int i;
+ cpp_hashnode *node;
+
+ for (i = 0; i < (unsigned int) N_DIRECTIVES; i++)
+ {
+ node = cpp_lookup (pfile, dtable[i].name, dtable[i].length);
+ node->is_directive = 1;
+ node->directive_index = i;
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 11:28:35 +0000