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Diffstat (limited to 'gcc-4.2.1-5666.3/libcpp/directives.c')
| -rw-r--r-- | gcc-4.2.1-5666.3/libcpp/directives.c | 2360 |
1 files changed, 2360 insertions, 0 deletions
diff --git a/gcc-4.2.1-5666.3/libcpp/directives.c b/gcc-4.2.1-5666.3/libcpp/directives.c new file mode 100644 index 000000000..e553444ef --- /dev/null +++ b/gcc-4.2.1-5666.3/libcpp/directives.c @@ -0,0 +1,2360 @@ +/* CPP Library. (Directive handling.) + Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, + 1999, 2000, 2001, 2002, 2003, 2004, 2005 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 2, 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; 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 "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; + unsigned int 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). + + APPLE LOCAL begin pch distcc --mrs + IN_I_PCH means that this directive should be handled even if + -fpreprocessed is in effect as long as pch_preprocess is also in + effect. + APPLE LOCAL end pch distcc --mrs + + 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) +/* APPLE LOCAL pch distcc --mrs */ +#define IN_I_PCH (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 *); +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 ***); +static void push_conditional (cpp_reader *, int, int, const cpp_hashnode *); +static unsigned int read_flag (cpp_reader *, unsigned int); +static int strtoul_for_line (const uchar *, unsigned int, unsigned long *); +static void do_diagnostic (cpp_reader *, int, int); +static cpp_hashnode *lex_macro_node (cpp_reader *); +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); +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); + +/* 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 and #include_next + 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 */ \ +/* APPLE LOCAL pch distcc --mrs */ \ +D(include_pch, T_INCLUDE_PCH, KANDR, INCL | IN_I_PCH) \ +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, 0) /* 0 SVR4 */ \ +D(unassert, T_UNASSERT, EXTENSION, 0) /* 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, U"#", 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. */ +static void +check_eol (cpp_reader *pfile) +{ + /* APPLE LOCAL begin -Wextra-tokens 2001-08-02 --sts */ + if (! SEEN_EOL () && _cpp_lex_token (pfile)->type != CPP_EOF + && CPP_OPTION (pfile, warn_extra_tokens)) + /* APPLE LOCAL end -Wextra-tokens 2001-08-02 --sts */ + 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 (pfile->state.in_deferred_pragma) + ; + else if (CPP_OPTION (pfile, traditional)) + { + /* Revert change of prepare_directive_trad. */ + pfile->state.prevent_expansion--; + + if (pfile->directive != &dtable[T_DEFINE]) + _cpp_remove_overlay (pfile); + } + /* 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 warnings for extensions. */ + if (CPP_PEDANTIC (pfile) + && ! pfile->state.skipping + /* APPLE LOCAL begin import valid for objc 4588440 */ + && dir->origin == EXTENSION + && (!CPP_OPTION (pfile, objc) + || dir != &dtable[T_IMPORT])) + /* APPLE LOCAL end import valid for objc 4588440 */ + cpp_error (pfile, CPP_DL_PEDWARN, "#%s is a 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_error (pfile, CPP_DL_WARNING, + "suggest not using #elif in traditional C"); + else if (indented && dir->origin == KANDR) + cpp_error (pfile, CPP_DL_WARNING, + "traditional C ignores #%s with the # indented", + dir->name); + else if (!indented && dir->origin != KANDR) + cpp_error (pfile, CPP_DL_WARNING, + "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, 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->is_directive) + dir = &dtable[dname->val.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. */ + if (CPP_OPTION (pfile, preprocessed) + /* APPLE LOCAL begin pch distcc --mrs */ + && (indented || !(dir->flags & IN_I)) + && ! (CPP_OPTION (pfile, pch_preprocess) + && (dir->flags & IN_I_PCH))) + /* APPLE LOCAL end pch distcc --mrs */ + { + 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) + { + /* 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. */ +static cpp_hashnode * +lex_macro_node (cpp_reader *pfile) +{ + 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; + + if (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)); + 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); + + 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 (_cpp_create_definition (pfile, node)) + if (pfile->cb.define) + pfile->cb.define (pfile, pfile->directive_line, node); + } +} + +/* 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); + + if (node) + { + 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); +} + +/* 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); + 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. */ +static const char * +parse_include (cpp_reader *pfile, int *pangle_brackets, + const cpp_token ***buf) +{ + char *fname; + const cpp_token *header; + + /* Allow macro expansion. */ + header = get_token_no_padding (pfile); + if (header->type == CPP_STRING || 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 = U"pragma dependency"; + else + dir = pfile->directive->name; + cpp_error (pfile, CPP_DL_ERROR, "#%s expects \"FILENAME\" or <FILENAME>", + dir); + + return NULL; + } + + if (buf == NULL || CPP_OPTION (pfile, discard_comments)) + check_eol (pfile); + 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; + + /* 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); + if (!fname) + { + if (buf) + XDELETEVEC (buf); + return; + } + + if (!*fname) + { + cpp_error (pfile, CPP_DL_ERROR, "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); +} + +/* APPLE LOCAL begin pch distcc --mrs */ +static void +do_include_pch (cpp_reader *pfile) +{ + do_include_common (pfile, IT_INCLUDE_PCH); +} +/* APPLE LOCAL end pch distcc --mrs */ + +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 (! pfile->buffer->prev) + { + 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 0 if the + number was well-formed, 1 if not. Temporary, hopefully. */ +static int +strtoul_for_line (const uchar *str, unsigned int len, long unsigned int *nump) +{ + unsigned long reg = 0; + uchar c; + while (len--) + { + c = *str++; + if (!ISDIGIT (c)) + return 1; + reg *= 10; + reg += c - '0'; + } + *nump = reg; + return 0; +} + +/* 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; + unsigned long new_lineno; + + /* C99 raised the minimum limit on #line numbers. */ + unsigned int cap = CPP_OPTION (pfile, c99) ? 2147483647 : 32767; + + /* #line commands expand macros. */ + token = cpp_get_token (pfile); + if (token->type != CPP_NUMBER + || strtoul_for_line (token->val.str.text, token->val.str.len, + &new_lineno)) + { + 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)) + cpp_error (pfile, CPP_DL_PEDWARN, "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, + /* APPLE LOCAL pascal strings */ + &s, false, false)) + new_file = (const char *)s.text; + check_eol (pfile); + } + 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, 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; + unsigned long new_lineno; + unsigned int new_sysp = map->sysp; + enum lc_reason reason = LC_RENAME; + int flag; + + /* 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 + || strtoul_for_line (token->val.str.text, token->val.str.len, + &new_lineno)) + { + 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, + /* APPLE LOCAL pascal strings */ + 1, &s, false, false)) + 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); + } + 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, 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, unsigned int 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); + + /* APPLE LOCAL begin 4137741 */ + if (pfile->cb.file_change) + { + struct line_map *old_maps = pfile->line_table->maps; + source_location old_loc = 0; + + if (map) + old_loc = map->start_location; + + pfile->cb.file_change (pfile, map); + + /* The file_change callback could reallocate the line_table maps causing + "map" we got to be invalid */ + if (map && old_maps != pfile->line_table->maps) + map = linemap_lookup (pfile->line_table, old_loc); + } + + /* If file change debug hook callbacks are being deferred, we will + need special CPP_BINCL and CPP_EINCL tokens to carry the information + to the front-end. */ + if (map && CPP_OPTION (pfile, defer_file_change_debug_hooks)) + { + cpp_token *tok; + + if ((reason == LC_ENTER && !MAIN_FILE_P (map))) + { + uchar *s; + cpp_string body; + + /* We can handle '#include' similarly to '#pragma'. */ + tok = &pfile->directive_result; + tok->type = CPP_BINCL; + body.len = strlen (map->to_file); + s = _cpp_unaligned_alloc (pfile, body.len + 1); + memcpy (s, map->to_file, body.len + 1); + body.text = s; + tok->val.str = body; +#ifdef USE_MAPPED_LOCATION + tok->src_loc = LAST_SOURCE_LINE_LOCATION (map - 1); +#else + tok->src_loc = LAST_SOURCE_LINE (map - 1); +#endif + } + else if (reason == LC_LEAVE) + { + /* Grow CPP_EINCL buffer if necessary. This should be extremely + rare, since it requires that more than 250 nested headers reach + end-of-file simultaneously. */ + if (pfile->end_eincl == pfile->cur_eincl->limit) + { + pfile->cur_eincl = _cpp_next_tokenrun (pfile->cur_eincl); + pfile->end_eincl = pfile->cur_eincl->base; + } + + tok = pfile->end_eincl++; + tok->type = CPP_EINCL; + tok->src_loc = map->to_line; + tok->flags = 0; + pfile->have_eincl = true; + } + } + /* APPLE LOCAL end 4137741 */ +} + +/* 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 print_dir) +{ + if (_cpp_begin_message (pfile, code, pfile->cur_token[-1].src_loc, 0)) + { + if (print_dir) + fprintf (stderr, "#%s ", pfile->directive->name); + pfile->state.prevent_expansion++; + /* APPLE LOCAL #error with unmatched quotes 5607574 */ + pfile->state.in_diagnostic++; + cpp_output_line (pfile, stderr); + /* APPLE LOCAL #error with unmatched quotes 5607574 */ + pfile->state.in_diagnostic--; + pfile->state.prevent_expansion--; + } +} + +static void +do_error (cpp_reader *pfile) +{ + do_diagnostic (pfile, CPP_DL_ERROR, 1); +} + +static void +do_warning (cpp_reader *pfile) +{ + /* We want #warning diagnostics to be emitted in system headers too. */ + /* APPLE LOCAL begin handle -Wno-system-headers (2910306) --ilr */ + /* Unless explicitly suppressed with -Wno-system-headers or + -Wno-#warning. */ + if (!CPP_OPTION (pfile, no_pound_warnings) + && (!CPP_IN_SYSTEM_HEADER (pfile) + || CPP_OPTION (pfile, warn_system_headers))) + do_diagnostic (pfile, CPP_DL_WARNING_SYSHDR, 1); + /* APPLE LOCAL end handle -Wno-system-headers (2910306) --ilr */ +} + +/* 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); +} + +/* 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, U 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, U 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; + } +} + +/* APPLE LOCAL begin pragma mark 5614511 */ +/* Handle #pragma mark. */ +static void +do_pragma_mark (cpp_reader *pfile) +{ + ++pfile->state.skipping; + skip_rest_of_line (pfile); + --pfile->state.skipping; +} +/* APPLE LOCAL end pragma mark 5614511 */ + +/* 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); + /* APPLE LOCAL pragma mark 5614511 */ + register_pragma_internal (pfile, 0, "mark", do_pragma_mark); + + /* 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, U *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); + 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); + 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 (pfile->buffer->prev == NULL) + cpp_error (pfile, CPP_DL_WARNING, "#pragma once in main file"); + + check_eol (pfile); + _cpp_mark_file_once_only (pfile, pfile->buffer->file); +} + +/* 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; + 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) +{ + cpp_buffer *buffer = pfile->buffer; + + if (buffer->prev == 0) + cpp_error (pfile, CPP_DL_WARNING, + "#pragma system_header ignored outside include file"); + else + { + check_eol (pfile); + 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; + + fname = parse_include (pfile, &angle_brackets, NULL); + 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); + } + } + + 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; + + if (get_token_no_padding (pfile)->type != CPP_OPEN_PAREN) + return NULL; + + string = get_token_no_padding (pfile); + if (string->type != CPP_STRING && string->type != CPP_WSTRING) + return NULL; + + if (get_token_no_padding (pfile)->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; + + 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); + do_pragma (pfile); + end_directive (pfile, 1); + + /* 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. */ +void +_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); + else + cpp_error (pfile, CPP_DL_ERROR, + "_Pragma takes a parenthesized string literal"); +} + +/* Handle #ifdef. */ +static void +do_ifdef (cpp_reader *pfile) +{ + int skip = 1; + + if (! pfile->state.skipping) + { + const cpp_hashnode *node = lex_macro_node (pfile); + + if (node) + { + skip = node->type != NT_MACRO; + _cpp_mark_macro_used (node); + check_eol (pfile); + } + } + + push_conditional (pfile, skip, T_IFDEF, 0); +} + +/* Handle #ifndef. */ +static void +do_ifndef (cpp_reader *pfile) +{ + int skip = 1; + const cpp_hashnode *node = 0; + + if (! pfile->state.skipping) + { + node = lex_macro_node (pfile); + + if (node) + { + skip = node->type == NT_MACRO; + _cpp_mark_macro_used (node); + check_eol (pfile); + } + } + + 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) == 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. */ + /* APPLE LOCAL begin -Wextra-tokens */ + if (!ifs->was_skipping + && (CPP_OPTION (pfile, warn_endif_labels) || CPP_OPTION (pfile, warn_extra_tokens))) + /* APPLE LOCAL end -Wextra-tokens */ + check_eol (pfile); + } +} + +/* 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; + + /* Only evaluate this if we aren't skipping elses. During + evaluation, set skipping to false to get lexer warnings. */ + if (ifs->skip_elses) + pfile->state.skipping = 1; + else + { + pfile->state.skipping = 0; + pfile->state.skipping = ! _cpp_parse_expr (pfile); + ifs->skip_elses = ! pfile->state.skipping; + } + + /* 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. */ + /* APPLE LOCAL begin -Wextra-tokens */ + if (!ifs->was_skipping + && (CPP_OPTION (pfile, warn_endif_labels) || CPP_OPTION (pfile, warn_extra_tokens))) + /* APPLE LOCAL end -Wextra-tokens */ + check_eol (pfile); + + /* 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. */ +static int +parse_answer (cpp_reader *pfile, struct answer **answerp, int type) +{ + 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 (pfile, CPP_DL_ERROR, "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 (pfile, CPP_DL_ERROR, "predicate must be an identifier"); + else if (parse_answer (pfile, answerp, type) == 0) + { + unsigned int len = NODE_LEN (predicate->val.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), 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); + } +} + +/* 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); + } + 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, *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); +} + +/* 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); +} + +/* 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 number of errors for a given reader. */ +unsigned int +cpp_errors (cpp_reader *pfile) +{ + return pfile->errors; +} + +/* The options structure. */ +cpp_options * +cpp_get_options (cpp_reader *pfile) +{ + return &pfile->opts; +} + +/* APPLE LOCAL begin predictive compilation */ +void +set_stdin_option (cpp_reader *pfile, int predict_comp_size) +{ + if (! CPP_OPTION (pfile, preprocessed)) + { + /* -fpreprocessed -fpredictive-compilation=n: compiler is reading from + the processed file in this case. */ + CPP_OPTION (pfile, predictive_compilation) = true; + CPP_OPTION (pfile, predictive_compilation_size) = predict_comp_size; + } +} +/* APPLE LOCAL end predictive compilation */ + +/* 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; + } +} |