diff options
Diffstat (limited to 'gcc/cppinit.c')
| -rw-r--r-- | gcc/cppinit.c | 627 |
1 files changed, 0 insertions, 627 deletions
diff --git a/gcc/cppinit.c b/gcc/cppinit.c deleted file mode 100644 index 55323b4ea9b..00000000000 --- a/gcc/cppinit.c +++ /dev/null @@ -1,627 +0,0 @@ -/* CPP Library. - Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, - 1999, 2000, 2001, 2002, 2003, 2004 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -#include "config.h" -#include "system.h" -#include "cpplib.h" -#include "cpphash.h" -#include "mkdeps.h" - -static void init_library (void); -static void mark_named_operators (cpp_reader *); -static void read_original_filename (cpp_reader *); -static void read_original_directory (cpp_reader *); -static void post_options (cpp_reader *); - -/* If we have designated initializers (GCC >2.7) these tables can be - initialized, constant data. Otherwise, they have to be filled in at - runtime. */ -#if HAVE_DESIGNATED_INITIALIZERS - -#define init_trigraph_map() /* Nothing. */ -#define TRIGRAPH_MAP \ -__extension__ const uchar _cpp_trigraph_map[UCHAR_MAX + 1] = { - -#define END }; -#define s(p, v) [p] = v, - -#else - -#define TRIGRAPH_MAP uchar _cpp_trigraph_map[UCHAR_MAX + 1] = { 0 }; \ - static void init_trigraph_map (void) { \ - unsigned char *x = _cpp_trigraph_map; - -#define END } -#define s(p, v) x[p] = v; - -#endif - -TRIGRAPH_MAP - s('=', '#') s(')', ']') s('!', '|') - s('(', '[') s('\'', '^') s('>', '}') - s('/', '\\') s('<', '{') s('-', '~') -END - -#undef s -#undef END -#undef TRIGRAPH_MAP - -/* A set of booleans indicating what CPP features each source language - requires. */ -struct lang_flags -{ - char c99; - char cplusplus; - char extended_numbers; - char std; - char cplusplus_comments; - char digraphs; -}; - -static const struct lang_flags lang_defaults[] = -{ /* c99 c++ xnum std // digr */ - /* GNUC89 */ { 0, 0, 1, 0, 1, 1 }, - /* GNUC99 */ { 1, 0, 1, 0, 1, 1 }, - /* STDC89 */ { 0, 0, 0, 1, 0, 0 }, - /* STDC94 */ { 0, 0, 0, 1, 0, 1 }, - /* STDC99 */ { 1, 0, 1, 1, 1, 1 }, - /* GNUCXX */ { 0, 1, 1, 0, 1, 1 }, - /* CXX98 */ { 0, 1, 1, 1, 1, 1 }, - /* ASM */ { 0, 0, 1, 0, 1, 0 } -}; - -/* Sets internal flags correctly for a given language. */ -void -cpp_set_lang (cpp_reader *pfile, enum c_lang lang) -{ - const struct lang_flags *l = &lang_defaults[(int) lang]; - - CPP_OPTION (pfile, lang) = lang; - - CPP_OPTION (pfile, c99) = l->c99; - CPP_OPTION (pfile, cplusplus) = l->cplusplus; - CPP_OPTION (pfile, extended_numbers) = l->extended_numbers; - CPP_OPTION (pfile, std) = l->std; - CPP_OPTION (pfile, trigraphs) = l->std; - CPP_OPTION (pfile, cplusplus_comments) = l->cplusplus_comments; - CPP_OPTION (pfile, digraphs) = l->digraphs; -} - -/* Initialize library global state. */ -static void -init_library (void) -{ - static int initialized = 0; - - if (! initialized) - { - initialized = 1; - - /* Set up the trigraph map. This doesn't need to do anything if - we were compiled with a compiler that supports C99 designated - initializers. */ - init_trigraph_map (); - } -} - -/* Initialize a cpp_reader structure. */ -cpp_reader * -cpp_create_reader (enum c_lang lang, hash_table *table, - struct line_maps *line_table) -{ - cpp_reader *pfile; - - /* Initialize this instance of the library if it hasn't been already. */ - init_library (); - - pfile = xcalloc (1, sizeof (cpp_reader)); - - cpp_set_lang (pfile, lang); - CPP_OPTION (pfile, warn_multichar) = 1; - CPP_OPTION (pfile, discard_comments) = 1; - CPP_OPTION (pfile, discard_comments_in_macro_exp) = 1; - CPP_OPTION (pfile, show_column) = 1; - CPP_OPTION (pfile, tabstop) = 8; - CPP_OPTION (pfile, operator_names) = 1; - CPP_OPTION (pfile, warn_trigraphs) = 2; - CPP_OPTION (pfile, warn_endif_labels) = 1; - CPP_OPTION (pfile, warn_deprecated) = 1; - CPP_OPTION (pfile, warn_long_long) = !CPP_OPTION (pfile, c99); - CPP_OPTION (pfile, dollars_in_ident) = 1; - CPP_OPTION (pfile, warn_dollars) = 1; - CPP_OPTION (pfile, warn_variadic_macros) = 1; - - /* Default CPP arithmetic to something sensible for the host for the - benefit of dumb users like fix-header. */ - CPP_OPTION (pfile, precision) = CHAR_BIT * sizeof (long); - CPP_OPTION (pfile, char_precision) = CHAR_BIT; - CPP_OPTION (pfile, wchar_precision) = CHAR_BIT * sizeof (int); - CPP_OPTION (pfile, int_precision) = CHAR_BIT * sizeof (int); - CPP_OPTION (pfile, unsigned_char) = 0; - CPP_OPTION (pfile, unsigned_wchar) = 1; - CPP_OPTION (pfile, bytes_big_endian) = 1; /* does not matter */ - - /* Default to no charset conversion. */ - CPP_OPTION (pfile, narrow_charset) = _cpp_default_encoding (); - CPP_OPTION (pfile, wide_charset) = 0; - - /* Default the input character set to UTF-8. */ - CPP_OPTION (pfile, input_charset) = _cpp_default_encoding (); - - /* A fake empty "directory" used as the starting point for files - looked up without a search path. Name cannot be '/' because we - don't want to prepend anything at all to filenames using it. All - other entries are correct zero-initialized. */ - pfile->no_search_path.name = (char *) ""; - - /* Initialize the line map. */ - pfile->line_table = line_table; - - /* Initialize lexer state. */ - pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments); - - /* Set up static tokens. */ - pfile->avoid_paste.type = CPP_PADDING; - pfile->avoid_paste.val.source = NULL; - pfile->eof.type = CPP_EOF; - pfile->eof.flags = 0; - - /* Create a token buffer for the lexer. */ - _cpp_init_tokenrun (&pfile->base_run, 250); - pfile->cur_run = &pfile->base_run; - pfile->cur_token = pfile->base_run.base; - - /* Initialize the base context. */ - pfile->context = &pfile->base_context; - pfile->base_context.macro = 0; - pfile->base_context.prev = pfile->base_context.next = 0; - - /* Aligned and unaligned storage. */ - pfile->a_buff = _cpp_get_buff (pfile, 0); - pfile->u_buff = _cpp_get_buff (pfile, 0); - - /* The expression parser stack. */ - _cpp_expand_op_stack (pfile); - - /* Initialize the buffer obstack. */ - _obstack_begin (&pfile->buffer_ob, 0, 0, - (void *(*) (long)) xmalloc, - (void (*) (void *)) free); - - _cpp_init_files (pfile); - - _cpp_init_hashtable (pfile, table); - - return pfile; -} - -/* Free resources used by PFILE. Accessing PFILE after this function - returns leads to undefined behavior. Returns the error count. */ -void -cpp_destroy (cpp_reader *pfile) -{ - cpp_context *context, *contextn; - tokenrun *run, *runn; - - free (pfile->op_stack); - - while (CPP_BUFFER (pfile) != NULL) - _cpp_pop_buffer (pfile); - - if (pfile->out.base) - free (pfile->out.base); - - if (pfile->macro_buffer) - { - free (pfile->macro_buffer); - pfile->macro_buffer = NULL; - pfile->macro_buffer_len = 0; - } - - if (pfile->deps) - deps_free (pfile->deps); - obstack_free (&pfile->buffer_ob, 0); - - _cpp_destroy_hashtable (pfile); - _cpp_cleanup_files (pfile); - _cpp_destroy_iconv (pfile); - - _cpp_free_buff (pfile->a_buff); - _cpp_free_buff (pfile->u_buff); - _cpp_free_buff (pfile->free_buffs); - - for (run = &pfile->base_run; run; run = runn) - { - runn = run->next; - free (run->base); - if (run != &pfile->base_run) - free (run); - } - - for (context = pfile->base_context.next; context; context = contextn) - { - contextn = context->next; - free (context); - } - - free (pfile); -} - -/* This structure defines one built-in identifier. A node will be - entered in the hash table under the name NAME, with value VALUE. - - There are two tables of these. builtin_array holds all the - "builtin" macros: these are handled by builtin_macro() in - cppmacro.c. Builtin is somewhat of a misnomer -- the property of - interest is that these macros require special code to compute their - expansions. The value is a "builtin_type" enumerator. - - operator_array holds the C++ named operators. These are keywords - which act as aliases for punctuators. In C++, they cannot be - altered through #define, and #if recognizes them as operators. In - C, these are not entered into the hash table at all (but see - <iso646.h>). The value is a token-type enumerator. */ -struct builtin -{ - const uchar *name; - unsigned short len; - unsigned short value; -}; - -#define B(n, t) { DSC(n), t } -static const struct builtin builtin_array[] = -{ - B("__TIME__", BT_TIME), - B("__DATE__", BT_DATE), - B("__FILE__", BT_FILE), - B("__BASE_FILE__", BT_BASE_FILE), - B("__LINE__", BT_SPECLINE), - B("__INCLUDE_LEVEL__", BT_INCLUDE_LEVEL), - /* Keep builtins not used for -traditional-cpp at the end, and - update init_builtins() if any more are added. */ - B("_Pragma", BT_PRAGMA), - B("__STDC__", BT_STDC), -}; - -static const struct builtin operator_array[] = -{ - B("and", CPP_AND_AND), - B("and_eq", CPP_AND_EQ), - B("bitand", CPP_AND), - B("bitor", CPP_OR), - B("compl", CPP_COMPL), - B("not", CPP_NOT), - B("not_eq", CPP_NOT_EQ), - B("or", CPP_OR_OR), - B("or_eq", CPP_OR_EQ), - B("xor", CPP_XOR), - B("xor_eq", CPP_XOR_EQ) -}; -#undef B - -/* Mark the C++ named operators in the hash table. */ -static void -mark_named_operators (cpp_reader *pfile) -{ - const struct builtin *b; - - for (b = operator_array; - b < (operator_array + ARRAY_SIZE (operator_array)); - b++) - { - cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len); - hp->flags |= NODE_OPERATOR; - hp->is_directive = 0; - hp->directive_index = b->value; - } -} - -/* Read the builtins table above and enter them, and language-specific - macros, into the hash table. HOSTED is true if this is a hosted - environment. */ -void -cpp_init_builtins (cpp_reader *pfile, int hosted) -{ - const struct builtin *b; - size_t n = ARRAY_SIZE (builtin_array); - - if (CPP_OPTION (pfile, traditional)) - n -= 2; - - for(b = builtin_array; b < builtin_array + n; b++) - { - cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len); - hp->type = NT_MACRO; - hp->flags |= NODE_BUILTIN | NODE_WARN; - hp->value.builtin = b->value; - } - - if (CPP_OPTION (pfile, cplusplus)) - _cpp_define_builtin (pfile, "__cplusplus 1"); - else if (CPP_OPTION (pfile, lang) == CLK_ASM) - _cpp_define_builtin (pfile, "__ASSEMBLER__ 1"); - else if (CPP_OPTION (pfile, lang) == CLK_STDC94) - _cpp_define_builtin (pfile, "__STDC_VERSION__ 199409L"); - else if (CPP_OPTION (pfile, c99)) - _cpp_define_builtin (pfile, "__STDC_VERSION__ 199901L"); - - if (hosted) - _cpp_define_builtin (pfile, "__STDC_HOSTED__ 1"); - else - _cpp_define_builtin (pfile, "__STDC_HOSTED__ 0"); - - if (CPP_OPTION (pfile, objc)) - _cpp_define_builtin (pfile, "__OBJC__ 1"); -} - -/* Sanity-checks are dependent on command-line options, so it is - called as a subroutine of cpp_read_main_file (). */ -#if ENABLE_CHECKING -static void sanity_checks (cpp_reader *); -static void sanity_checks (cpp_reader *pfile) -{ - cppchar_t test = 0; - size_t max_precision = 2 * CHAR_BIT * sizeof (cpp_num_part); - - /* Sanity checks for assumptions about CPP arithmetic and target - type precisions made by cpplib. */ - test--; - if (test < 1) - cpp_error (pfile, CPP_DL_ICE, "cppchar_t must be an unsigned type"); - - if (CPP_OPTION (pfile, precision) > max_precision) - cpp_error (pfile, CPP_DL_ICE, - "preprocessor arithmetic has maximum precision of %lu bits;" - " target requires %lu bits", - (unsigned long) max_precision, - (unsigned long) CPP_OPTION (pfile, precision)); - - if (CPP_OPTION (pfile, precision) < CPP_OPTION (pfile, int_precision)) - cpp_error (pfile, CPP_DL_ICE, - "CPP arithmetic must be at least as precise as a target int"); - - if (CPP_OPTION (pfile, char_precision) < 8) - cpp_error (pfile, CPP_DL_ICE, "target char is less than 8 bits wide"); - - if (CPP_OPTION (pfile, wchar_precision) < CPP_OPTION (pfile, char_precision)) - cpp_error (pfile, CPP_DL_ICE, - "target wchar_t is narrower than target char"); - - if (CPP_OPTION (pfile, int_precision) < CPP_OPTION (pfile, char_precision)) - cpp_error (pfile, CPP_DL_ICE, - "target int is narrower than target char"); - - /* This is assumed in eval_token() and could be fixed if necessary. */ - if (sizeof (cppchar_t) > sizeof (cpp_num_part)) - cpp_error (pfile, CPP_DL_ICE, - "CPP half-integer narrower than CPP character"); - - if (CPP_OPTION (pfile, wchar_precision) > BITS_PER_CPPCHAR_T) - cpp_error (pfile, CPP_DL_ICE, - "CPP on this host cannot handle wide character constants over" - " %lu bits, but the target requires %lu bits", - (unsigned long) BITS_PER_CPPCHAR_T, - (unsigned long) CPP_OPTION (pfile, wchar_precision)); -} -#else -# define sanity_checks(PFILE) -#endif - -/* Add a dependency target. Can be called any number of times before - cpp_read_main_file(). If no targets have been added before - cpp_read_main_file(), then the default target is used. */ -void -cpp_add_dependency_target (cpp_reader *pfile, const char *target, int quote) -{ - if (!pfile->deps) - pfile->deps = deps_init (); - - deps_add_target (pfile->deps, target, quote); -} - -/* This is called after options have been parsed, and partially - processed. */ -void -cpp_post_options (cpp_reader *pfile) -{ - sanity_checks (pfile); - - post_options (pfile); - - /* Mark named operators before handling command line macros. */ - if (CPP_OPTION (pfile, cplusplus) && CPP_OPTION (pfile, operator_names)) - mark_named_operators (pfile); -} - -/* Setup for processing input from the file named FNAME, or stdin if - it is the empty string. Return the original filename - on success (e.g. foo.i->foo.c), or NULL on failure. */ -const char * -cpp_read_main_file (cpp_reader *pfile, const char *fname) -{ - if (CPP_OPTION (pfile, deps.style) != DEPS_NONE) - { - if (!pfile->deps) - pfile->deps = deps_init (); - - /* Set the default target (if there is none already). */ - deps_add_default_target (pfile->deps, fname); - } - - pfile->main_file - = _cpp_find_file (pfile, fname, &pfile->no_search_path, false); - if (_cpp_find_failed (pfile->main_file)) - return NULL; - - _cpp_stack_file (pfile, pfile->main_file, false); - - /* For foo.i, read the original filename foo.c now, for the benefit - of the front ends. */ - if (CPP_OPTION (pfile, preprocessed)) - { - read_original_filename (pfile); - fname = pfile->line_table->maps[pfile->line_table->used-1].to_file; - } - return fname; -} - -/* For preprocessed files, if the first tokens are of the form # NUM. - handle the directive so we know the original file name. This will - generate file_change callbacks, which the front ends must handle - appropriately given their state of initialization. */ -static void -read_original_filename (cpp_reader *pfile) -{ - const cpp_token *token, *token1; - - /* Lex ahead; if the first tokens are of the form # NUM, then - process the directive, otherwise back up. */ - token = _cpp_lex_direct (pfile); - if (token->type == CPP_HASH) - { - token1 = _cpp_lex_direct (pfile); - _cpp_backup_tokens (pfile, 1); - - /* If it's a #line directive, handle it. */ - if (token1->type == CPP_NUMBER) - { - _cpp_handle_directive (pfile, token->flags & PREV_WHITE); - read_original_directory (pfile); - return; - } - } - - /* Backup as if nothing happened. */ - _cpp_backup_tokens (pfile, 1); -} - -/* For preprocessed files, if the tokens following the first filename - line is of the form # <line> "/path/name//", handle the - directive so we know the original current directory. */ -static void -read_original_directory (cpp_reader *pfile) -{ - const cpp_token *hash, *token; - - /* Lex ahead; if the first tokens are of the form # NUM, then - process the directive, otherwise back up. */ - hash = _cpp_lex_direct (pfile); - if (hash->type != CPP_HASH) - { - _cpp_backup_tokens (pfile, 1); - return; - } - - token = _cpp_lex_direct (pfile); - - if (token->type != CPP_NUMBER) - { - _cpp_backup_tokens (pfile, 2); - return; - } - - token = _cpp_lex_direct (pfile); - - if (token->type != CPP_STRING - || ! (token->val.str.len >= 5 - && token->val.str.text[token->val.str.len-2] == '/' - && token->val.str.text[token->val.str.len-3] == '/')) - { - _cpp_backup_tokens (pfile, 3); - return; - } - - if (pfile->cb.dir_change) - { - char *debugdir = alloca (token->val.str.len - 3); - - memcpy (debugdir, (const char *) token->val.str.text + 1, - token->val.str.len - 4); - debugdir[token->val.str.len - 4] = '\0'; - - pfile->cb.dir_change (pfile, debugdir); - } -} - -/* This is called at the end of preprocessing. It pops the last - buffer and writes dependency output, and returns the number of - errors. - - Maybe it should also reset state, such that you could call - cpp_start_read with a new filename to restart processing. */ -int -cpp_finish (cpp_reader *pfile, FILE *deps_stream) -{ - /* Warn about unused macros before popping the final buffer. */ - if (CPP_OPTION (pfile, warn_unused_macros)) - cpp_forall_identifiers (pfile, _cpp_warn_if_unused_macro, NULL); - - /* cpplex.c leaves the final buffer on the stack. This it so that - it returns an unending stream of CPP_EOFs to the client. If we - popped the buffer, we'd dereference a NULL buffer pointer and - segfault. It's nice to allow the client to do worry-free excess - cpp_get_token calls. */ - while (pfile->buffer) - _cpp_pop_buffer (pfile); - - /* Don't write the deps file if there are errors. */ - if (CPP_OPTION (pfile, deps.style) != DEPS_NONE - && deps_stream && pfile->errors == 0) - { - deps_write (pfile->deps, deps_stream, 72); - - if (CPP_OPTION (pfile, deps.phony_targets)) - deps_phony_targets (pfile->deps, deps_stream); - } - - /* Report on headers that could use multiple include guards. */ - if (CPP_OPTION (pfile, print_include_names)) - _cpp_report_missing_guards (pfile); - - return pfile->errors; -} - -static void -post_options (cpp_reader *pfile) -{ - /* -Wtraditional is not useful in C++ mode. */ - if (CPP_OPTION (pfile, cplusplus)) - CPP_OPTION (pfile, warn_traditional) = 0; - - /* Permanently disable macro expansion if we are rescanning - preprocessed text. Read preprocesed source in ISO mode. */ - if (CPP_OPTION (pfile, preprocessed)) - { - pfile->state.prevent_expansion = 1; - CPP_OPTION (pfile, traditional) = 0; - } - - if (CPP_OPTION (pfile, warn_trigraphs) == 2) - CPP_OPTION (pfile, warn_trigraphs) = !CPP_OPTION (pfile, trigraphs); - - if (CPP_OPTION (pfile, traditional)) - { - /* Traditional CPP does not accurately track column information. */ - CPP_OPTION (pfile, show_column) = 0; - CPP_OPTION (pfile, trigraphs) = 0; - CPP_OPTION (pfile, warn_trigraphs) = 0; - } -} |