gcc/cpplib.h

   1 /* Definitions for CPP library.
   2    Copyright (C) 1995, 96-99, 2000 Free Software Foundation, Inc.
   3    Written by Per Bothner, 1994-95.
   4
   5 This program is free software; you can redistribute it and/or modify it
   6 under the terms of the GNU General Public License as published by the
   7 Free Software Foundation; either version 2, or (at your option) any
   8 later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18
  19  In other words, you are welcome to use, share and improve this program.
  20  You are forbidden to forbid anyone else to use, share and improve
  21  what you give them.   Help stamp out software-hoarding!  */
  22 #ifndef __GCC_CPPLIB__
  23 #define __GCC_CPPLIB__
  24
  25 #include <sys/types.h>
  26
  27 #ifdef __cplusplus
  28 extern "C" {
  29 #endif
  30
  31 typedef unsigned char U_CHAR;
  32
  33 typedef struct cpp_reader cpp_reader;
  34 typedef struct cpp_buffer cpp_buffer;
  35 typedef struct cpp_options cpp_options;
  36
  37 enum cpp_token
  38 {
  39   CPP_EOF = -1,
  40   CPP_OTHER = 0,
  41   CPP_COMMENT = 1,
  42   CPP_HSPACE,
  43   CPP_VSPACE, /* newlines and #line directives */
  44   CPP_NAME,
  45   CPP_NUMBER,
  46   CPP_CHAR,
  47   CPP_WCHAR,
  48   CPP_STRING,
  49   CPP_WSTRING,
  50   CPP_DIRECTIVE,
  51   CPP_ASSERTION,        /* #machine(a29k) */
  52   CPP_STRINGIZE,        /* stringize macro argument */
  53   CPP_TOKPASTE,         /* paste macro arg with next/prev token */
  54   CPP_LPAREN,           /* "(" */
  55   CPP_RPAREN,           /* ")" */
  56   CPP_LBRACE,           /* "{" */
  57   CPP_RBRACE,           /* "}" */
  58   CPP_COMMA,            /* "," */
  59   CPP_SEMICOLON,        /* ";" */
  60   CPP_3DOTS,            /* "..." */
  61   CPP_POP               /* We're about to pop the buffer stack.  */
  62 };
  63
  64 typedef enum cpp_token (*parse_underflow_t) PARAMS((cpp_reader *));
  65 typedef int (*parse_cleanup_t) PARAMS((cpp_buffer *, cpp_reader *));
  66
  67 extern int cpp_handle_options PARAMS ((cpp_reader *, int, char **));
  68 extern enum cpp_token cpp_get_token PARAMS ((cpp_reader *));
  69 extern enum cpp_token cpp_get_non_space_token PARAMS ((cpp_reader *));
  70 extern enum cpp_token get_directive_token PARAMS ((cpp_reader *));
  71
  72 /* This frees resources used by PFILE. */
  73 extern void cpp_cleanup PARAMS ((cpp_reader *PFILE));
  74
  75 struct cpp_buffer
  76 {
  77   unsigned char *cur;    /* current position */
  78   unsigned char *rlimit; /* end of valid data */
  79   unsigned char *buf;    /* entire buffer */
  80   unsigned char *alimit; /* end of allocated buffer */
  81   unsigned char *line_base; /* start of current line */
  82
  83   struct cpp_buffer *prev;
  84
  85   /* Real filename.  (Alias to ->ihash->fname, obsolete). */
  86   const char *fname;
  87   /* Filename specified with #line command.  */
  88   const char *nominal_fname;
  89   /* Last filename specified with #line command.  */
  90   const char *last_nominal_fname;
  91   /* Actual directory of this file, used only for "" includes */
  92   struct file_name_list *actual_dir;
  93
  94   /* Pointer into the include hash table.  Used for include_next and
  95      to record control macros. */
  96   struct include_hash *ihash;
  97
  98   long lineno; /* Line number at CPP_LINE_BASE. */
  99   long colno; /* Column number at CPP_LINE_BASE. */
 100   long mark;  /* Saved position for lengthy backtrack. */
 101   parse_underflow_t underflow;
 102   parse_cleanup_t cleanup;
 103   void *data;
 104
 105   /* Value of if_stack at start of this file.
 106      Used to prohibit unmatched #endif (etc) in an include file.  */
 107   struct if_stack *if_stack;
 108
 109   /* True if this is a header file included using <FILENAME>.  */
 110   char system_header_p;
 111   char seen_eof;
 112
 113   /* True if buffer contains escape sequences.
 114      Currently there are two kinds:
 115      "\r-" means following identifier should not be macro-expanded.
 116      "\r " means a token-separator.  This turns into " " in final output
 117           if not stringizing and needed to separate tokens; otherwise nothing.
 118      Any other two-character sequence beginning with \r is an error.
 119
 120      If this is NOT set, then \r is a one-character escape meaning backslash
 121      newline.  This is guaranteed not to occur in the middle of a token.
 122      The two interpretations of \r do not conflict, because the two-character
 123      escapes are used only in macro buffers, and backslash-newline is removed
 124      from macro expansion text in collect_expansion and/or macarg.  */
 125   char has_escapes;
 126
 127   /* Used by the C++ frontend to implement redirected input (such as for
 128      default argument and/or template parsing).  */
 129   char manual_pop;
 130
 131   /* True if we have already warned about C++ comments in this file.
 132      The warning happens only for C89 extended mode with -pedantic on,
 133      and only once per file (otherwise it would be far too noisy).  */
 134   char warned_cplusplus_comments;
 135 };
 136
 137 struct file_name_map_list;
 138
 139 /* Maximum nesting of cpp_buffers.  We use a static limit, partly for
 140    efficiency, and partly to limit runaway recursion.  */
 141 #define CPP_STACK_MAX 200
 142
 143 /* A cpp_reader encapsulates the "state" of a pre-processor run.
 144    Applying cpp_get_token repeatedly yields a stream of pre-processor
 145    tokens.  Usually, there is only one cpp_reader object active. */
 146
 147 struct cpp_reader
 148 {
 149   parse_underflow_t get_token;
 150   cpp_buffer *buffer;
 151   cpp_options *opts;
 152
 153   /* A buffer used for both for cpp_get_token's output, and also internally. */
 154   unsigned char *token_buffer;
 155   /* Allocated size of token_buffer.  CPP_RESERVE allocates space.  */
 156   unsigned int token_buffer_size;
 157   /* End of the written part of token_buffer. */
 158   unsigned char *limit;
 159
 160   /* Error counter for exit code */
 161   int errors;
 162
 163   /* Line where a newline was first seen in a string constant.  */
 164   int multiline_string_line;
 165
 166   /* Current depth in #include directives that use <...>.  */
 167   int system_include_depth;
 168
 169   /* Current depth of buffer stack. */
 170   int buffer_stack_depth;
 171
 172   /* Hash table of macros and assertions.  See cpphash.c */
 173 #define HASHSIZE 1403
 174   struct hashnode **hashtab;
 175
 176   /* Hash table of other included files.  See cppfiles.c */
 177 #define ALL_INCLUDE_HASHSIZE 71
 178   struct include_hash *all_include_files[ALL_INCLUDE_HASHSIZE];
 179
 180   /* Chain of `actual directory' file_name_list entries,
 181      for "" inclusion. */
 182   struct file_name_list *actual_dirs;
 183
 184   /* Current maximum length of directory names in the search path
 185      for include files.  (Altered as we get more of them.)  */
 186   unsigned int max_include_len;
 187
 188   struct if_stack *if_stack;
 189
 190   /* Nonzero means we have printed (while error reporting) a list of
 191      containing files that matches the current status.  */
 192   char input_stack_listing_current;
 193
 194   /* If non-zero, macros are not expanded.  */
 195   char no_macro_expand;
 196
 197   /* If non-zero, directives cause a hard error.  Used when parsing
 198      macro arguments.  */
 199   char no_directives;
 200
 201   /* Print column number in error messages.  */
 202   char show_column;
 203
 204   /* We're printed a warning recommending against using #import.  */
 205   char import_warning;
 206
 207   /* If true, character between '<' and '>' are a single (string) token.  */
 208   char parsing_include_directive;
 209
 210   /* If true, # introduces an assertion (see do_assert) */
 211   char parsing_if_directive;
 212
 213   /* If true, # and ## are the STRINGIZE and TOKPASTE operators */
 214   char parsing_define_directive;
 215
 216   /* True if escape sequences (as described for has_escapes in
 217      parse_buffer) should be emitted.  */
 218   char output_escapes;
 219
 220   /* 0: Have seen non-white-space on this line.
 221      1: Only seen white space so far on this line.
 222      2: Only seen white space so far in this file.  */
 223   char only_seen_white;
 224
 225   long lineno;
 226
 227   struct tm *timebuf;
 228
 229   /* Buffer of -M output.  */
 230   struct deps *deps;
 231
 232   /* A buffer and a table, used only by read_and_prescan (in cppfiles.c)
 233      which are allocated once per cpp_reader object to keep them off the
 234      stack and avoid setup costs.  */
 235   U_CHAR *input_buffer;
 236   U_CHAR *input_speccase;
 237   size_t input_buffer_len;
 238 };
 239
 240 #define CPP_FATAL_LIMIT 1000
 241 /* True if we have seen a "fatal" error. */
 242 #define CPP_FATAL_ERRORS(READER) ((READER)->errors >= CPP_FATAL_LIMIT)
 243
 244 #define CPP_BUF_PEEK(BUFFER) \
 245   ((BUFFER)->cur < (BUFFER)->rlimit ? *(BUFFER)->cur : EOF)
 246 #define CPP_BUF_GET(BUFFER) \
 247   ((BUFFER)->cur < (BUFFER)->rlimit ? *(BUFFER)->cur++ : EOF)
 248 #define CPP_FORWARD(BUFFER, N) ((BUFFER)->cur += (N))
 249
 250 /* Macros for manipulating the token_buffer. */
 251
 252 #define CPP_OUT_BUFFER(PFILE) ((PFILE)->token_buffer)
 253
 254 /* Number of characters currently in PFILE's output buffer. */
 255 #define CPP_WRITTEN(PFILE) ((size_t)((PFILE)->limit - (PFILE)->token_buffer))
 256 #define CPP_PWRITTEN(PFILE) ((PFILE)->limit)
 257
 258 /* Make sure PFILE->token_buffer has space for at least N more characters. */
 259 #define CPP_RESERVE(PFILE, N) \
 260   (CPP_WRITTEN (PFILE) + (size_t)(N) > (PFILE)->token_buffer_size \
 261    && (cpp_grow_buffer (PFILE, N), 0))
 262
 263 /* Append string STR (of length N) to PFILE's output buffer.
 264    Assume there is enough space. */
 265 #define CPP_PUTS_Q(PFILE, STR, N) \
 266   (memcpy ((PFILE)->limit, STR, (N)), (PFILE)->limit += (N))
 267 /* Append string STR (of length N) to PFILE's output buffer.  Make space. */
 268 #define CPP_PUTS(PFILE, STR, N) CPP_RESERVE(PFILE, N), CPP_PUTS_Q(PFILE, STR,N)
 269 /* Append character CH to PFILE's output buffer.  Assume sufficient space. */
 270 #define CPP_PUTC_Q(PFILE, CH) (*(PFILE)->limit++ = (CH))
 271 /* Append character CH to PFILE's output buffer.  Make space if need be. */
 272 #define CPP_PUTC(PFILE, CH) (CPP_RESERVE (PFILE, 1), CPP_PUTC_Q (PFILE, CH))
 273 /* Make sure PFILE->limit is followed by '\0'. */
 274 #define CPP_NUL_TERMINATE_Q(PFILE) (*(PFILE)->limit = 0)
 275 #define CPP_NUL_TERMINATE(PFILE) (CPP_RESERVE(PFILE, 1), *(PFILE)->limit = 0)
 276 #define CPP_ADJUST_WRITTEN(PFILE,DELTA) ((PFILE)->limit += (DELTA))
 277 #define CPP_SET_WRITTEN(PFILE,N) ((PFILE)->limit = (PFILE)->token_buffer + (N))
 278
 279 /* Advance the current line by one. */
 280 #define CPP_BUMP_BUFFER_LINE(PBUF) ((PBUF)->lineno++,\
 281                                     (PBUF)->line_base = (PBUF)->cur)
 282 #define CPP_BUMP_LINE(PFILE) CPP_BUMP_BUFFER_LINE(CPP_BUFFER(PFILE))
 283
 284 #define CPP_OPTIONS(PFILE) ((PFILE)->opts)
 285 #define CPP_BUFFER(PFILE) ((PFILE)->buffer)
 286 #define CPP_PREV_BUFFER(BUFFER) ((BUFFER)->prev)
 287 /* The bottom of the buffer stack. */
 288 #define CPP_NULL_BUFFER(PFILE) NULL
 289
 290 /* The `pending' structure accumulates all the options that are not
 291    actually processed until we hit cpp_start_read.  It consists of
 292    several lists, one for each type of option.  We keep both head and
 293    tail pointers for quick insertion. */
 294 struct cpp_pending
 295 {
 296   struct pending_option *define_head, *define_tail;
 297   struct pending_option *assert_head, *assert_tail;
 298
 299   struct file_name_list *quote_head, *quote_tail;
 300   struct file_name_list *brack_head, *brack_tail;
 301   struct file_name_list *systm_head, *systm_tail;
 302   struct file_name_list *after_head, *after_tail;
 303
 304   struct pending_option *imacros_head, *imacros_tail;
 305   struct pending_option *include_head, *include_tail;
 306 };
 307
 308 /* Pointed to by cpp_reader.opts. */
 309 struct cpp_options {
 310   char *in_fname;
 311
 312   /* Name of output file, for error messages.  */
 313   const char *out_fname;
 314
 315   struct file_name_map_list *map_list;
 316
 317   /* Non-0 means -v, so print the full set of include dirs.  */
 318   char verbose;
 319
 320   /* Nonzero means use extra default include directories for C++.  */
 321
 322   char cplusplus;
 323
 324   /* Nonzero means handle cplusplus style comments */
 325
 326   char cplusplus_comments;
 327
 328   /* Nonzero means handle #import, for objective C.  */
 329
 330   char objc;
 331
 332   /* Nonzero means this is an assembly file, so ignore unrecognized
 333      directives and the "# 33" form of #line, both of which are
 334      probably comments.  Also, permit unbalanced ' strings (again,
 335      likely to be in comments).  */
 336
 337   char lang_asm;
 338
 339   /* Nonzero means this is Fortran, and we don't know where the
 340      comments are, so permit unbalanced ' strings.  Unlike lang_asm,
 341      this does not ignore unrecognized directives.  */
 342
 343   char lang_fortran;
 344
 345   /* Nonzero means handle CHILL comment syntax
 346      and output CHILL string delimiter for __DATE___ etc. */
 347
 348   char chill;
 349
 350   /* Nonzero means don't copy comments into the output file.  */
 351
 352   char discard_comments;
 353
 354   /* Nonzero means process the ANSI trigraph sequences.  */
 355
 356   char trigraphs;
 357
 358   /* Nonzero means print the names of included files rather than
 359      the preprocessed output.  1 means just the #include "...",
 360      2 means #include <...> as well.  */
 361
 362   char print_deps;
 363
 364   /* Nonzero if missing .h files in -M output are assumed to be generated
 365      files and not errors.  */
 366
 367   char print_deps_missing_files;
 368
 369   /* If true, fopen (deps_file, "a") else fopen (deps_file, "w"). */
 370   char print_deps_append;
 371
 372   /* Nonzero means print names of header files (-H).  */
 373
 374   char print_include_names;
 375
 376   /* Nonzero means try to make failure to fit ANSI C an error.  */
 377
 378   char pedantic_errors;
 379
 380   /* Nonzero means don't print warning messages.  */
 381
 382   char inhibit_warnings;
 383
 384   /* Nonzero means don't print error messages.  Has no option to select it,
 385      but can be set by a user of cpplib (e.g. fix-header).  */
 386
 387   char inhibit_errors;
 388
 389   /* Nonzero means warn if slash-star appears in a comment.  */
 390
 391   char warn_comments;
 392
 393   /* Nonzero means warn if there are any trigraphs.  */
 394
 395   char warn_trigraphs;
 396
 397   /* Nonzero means warn if #import is used.  */
 398
 399   char warn_import;
 400
 401   /* Nonzero means warn if a macro argument is (or would be)
 402      stringified with -traditional.  */
 403
 404   char warn_stringify;
 405
 406   /* Nonzero means turn warnings into errors.  */
 407
 408   char warnings_are_errors;
 409
 410   /* Nonzero causes output not to be done,
 411      but directives such as #define that have side effects
 412      are still obeyed.  */
 413
 414   char no_output;
 415
 416   /* Nonzero means we should look for header.gcc files that remap file
 417      names.  */
 418   char remap;
 419
 420   /* Nonzero means don't output line number information.  */
 421   char no_line_commands;
 422
 423   /* Nonzero means -I- has been seen,
 424      so don't look for #include "foo" the source-file directory.  */
 425   char ignore_srcdir;
 426
 427   /* Zero means dollar signs are punctuation.
 428      This used to be needed for conformance to the C Standard,
 429      before the C Standard was corrected.  */
 430   char dollars_in_ident;
 431
 432   /* Nonzero means try to imitate old fashioned non-ANSI preprocessor.  */
 433   char traditional;
 434
 435   /* Nonzero means warn if undefined identifiers are evaluated in an #if.  */
 436   char warn_undef;
 437
 438   /* Nonzero for the 1989 C Standard, including corrigenda and amendments.  */
 439   char c89;
 440
 441   /* Nonzero for the 1999 C Standard, including corrigenda and amendments.  */
 442   char c99;
 443
 444   /* Nonzero means give all the error messages the ANSI standard requires.  */
 445   char pedantic;
 446
 447   /* Nonzero means we're looking at already preprocessed code, so don't
 448      bother trying to do macro expansion and whatnot.  */
 449   char preprocessed;
 450
 451   char done_initializing;
 452
 453   /* Search paths for include files.  */
 454   struct file_name_list *quote_include;  /* First dir to search for "file" */
 455   struct file_name_list *bracket_include;/* First dir to search for <file> */
 456
 457   /* Directory prefix that should replace `/usr/lib/gcc-lib/TARGET/VERSION'
 458      in the standard include file directories.  */
 459   char *include_prefix;
 460   int include_prefix_len;
 461
 462   char no_standard_includes;
 463   char no_standard_cplusplus_includes;
 464
 465 /* dump_only means inhibit output of the preprocessed text
 466              and instead output the definitions of all user-defined
 467              macros in a form suitable for use as input to cccp.
 468    dump_names means pass #define and the macro name through to output.
 469    dump_definitions means pass the whole definition (plus #define) through
 470 */
 471
 472   enum {dump_none = 0, dump_only, dump_names, dump_definitions}
 473      dump_macros;
 474
 475 /* Nonzero means pass all #define and #undef directives which we actually
 476    process through to the output stream.  This feature is used primarily
 477    to allow cc1 to record the #defines and #undefs for the sake of
 478    debuggers which understand about preprocessor macros, but it may
 479    also be useful with -E to figure out how symbols are defined, and
 480    where they are defined.  */
 481   int debug_output;
 482
 483   /* Nonzero means pass #include lines through to the output,
 484      even if they are ifdefed out.  */
 485   int dump_includes;
 486
 487   /* Pending options - -D, -U, -A, -I, -ixxx. */
 488   struct cpp_pending *pending;
 489
 490   /* File name which deps are being written to.
 491      This is 0 if deps are being written to stdout.  */
 492   char *deps_file;
 493
 494   /* Target-name to write with the dependency information.  */
 495   char *deps_target;
 496 };
 497
 498 #define CPP_TRADITIONAL(PFILE) (CPP_OPTIONS(PFILE)-> traditional)
 499 #define CPP_WARN_UNDEF(PFILE) (CPP_OPTIONS(PFILE)->warn_undef)
 500 #define CPP_C89(PFILE) (CPP_OPTIONS(PFILE)->c89)
 501 #define CPP_PREPROCESSED(PFILE) (CPP_OPTIONS (PFILE)->preprocessed)
 502 #define CPP_PRINT_DEPS(PFILE) (CPP_OPTIONS (PFILE)->print_deps)
 503
 504 #define CPP_PEDANTIC(PFILE) \
 505   (CPP_OPTIONS (PFILE)->pedantic && !CPP_BUFFER (pfile)->system_header_p)
 506
 507 /* List of directories to look for include files in. */
 508 struct file_name_list
 509 {
 510   struct file_name_list *next;
 511   struct file_name_list *alloc; /* for the cache of
 512                                    current directory entries */
 513   char *name;
 514   unsigned int nlen;
 515   /* We use these to tell if the directory mentioned here is a duplicate
 516      of an earlier directory on the search path. */
 517   ino_t ino;
 518   dev_t dev;
 519   /* If the following is nonzero, it is a C-language system include
 520      directory.  */
 521   int sysp;
 522   /* Mapping of file names for this directory.
 523      Only used on MS-DOS and related platforms. */
 524   struct file_name_map *name_map;
 525 };
 526 #define ABSOLUTE_PATH ((struct file_name_list *)-1)
 527
 528 /* This structure is used for the table of all includes.  It is
 529    indexed by the `short name' (the name as it appeared in the
 530    #include statement) which is stored in *nshort.  */
 531 struct include_hash
 532 {
 533   struct include_hash *next;
 534   /* Next file with the same short name but a
 535      different (partial) pathname). */
 536   struct include_hash *next_this_file;
 537
 538   /* Location of the file in the include search path.
 539      Used for include_next */
 540   struct file_name_list *foundhere;
 541   const char *name;             /* (partial) pathname of file */
 542   const char *nshort;           /* name of file as referenced in #include */
 543   const char *control_macro;    /* macro, if any, preventing reinclusion -
 544                                    see redundant_include_p */
 545   char *buf, *limit;            /* for file content cache,
 546                                    not yet implemented */
 547 };
 548
 549 /* Name under which this program was invoked.  */
 550
 551 extern const char *progname;
 552
 553 /* The structure of a node in the hash table.  The hash table
 554    has entries for all tokens defined by #define commands (type T_MACRO),
 555    plus some special tokens like __LINE__ (these each have their own
 556    type, and the appropriate code is run when that type of node is seen.
 557    It does not contain control words like "#define", which are recognized
 558    by a separate piece of code. */
 559
 560 /* different flavors of hash nodes --- also used in keyword table */
 561 enum node_type {
 562  T_DEFINE = 1,  /* the `#define' keyword */
 563  T_INCLUDE,     /* the `#include' keyword */
 564  T_INCLUDE_NEXT, /* the `#include_next' keyword */
 565  T_IMPORT,      /* the `#import' keyword */
 566  T_IFDEF,       /* the `#ifdef' keyword */
 567  T_IFNDEF,      /* the `#ifndef' keyword */
 568  T_IF,          /* the `#if' keyword */
 569  T_ELSE,        /* `#else' */
 570  T_PRAGMA,      /* `#pragma' */
 571  T_ELIF,        /* `#elif' */
 572  T_UNDEF,       /* `#undef' */
 573  T_LINE,        /* `#line' */
 574  T_ERROR,       /* `#error' */
 575  T_WARNING,     /* `#warning' */
 576  T_ENDIF,       /* `#endif' */
 577  T_SCCS,        /* `#sccs', used on system V.  */
 578  T_IDENT,       /* `#ident', used on system V.  */
 579  T_ASSERT,      /* `#assert', taken from system V.  */
 580  T_UNASSERT,    /* `#unassert', taken from system V.  */
 581  T_SPECLINE,    /* special symbol `__LINE__' */
 582  T_DATE,        /* `__DATE__' */
 583  T_FILE,        /* `__FILE__' */
 584  T_BASE_FILE,   /* `__BASE_FILE__' */
 585  T_INCLUDE_LEVEL, /* `__INCLUDE_LEVEL__' */
 586  T_VERSION,     /* `__VERSION__' */
 587  T_TIME,        /* `__TIME__' */
 588  T_STDC,        /* `__STDC__' */
 589  T_CONST,       /* Constant string, used by `__SIZE_TYPE__' etc */
 590  T_MACRO,       /* macro defined by `#define' */
 591  T_DISABLED,    /* macro temporarily turned off for rescan */
 592  T_POISON,      /* defined with `#pragma poison' */
 593  T_UNUSED       /* Used for something not defined.  */
 594  };
 595
 596 /* Character classes.
 597    If the definition of `numchar' looks odd to you, please look up the
 598    definition of a pp-number in the C standard [section 6.4.8 of C99] */
 599 #define ISidnum         0x01    /* a-zA-Z0-9_ */
 600 #define ISidstart       0x02    /* _a-zA-Z */
 601 #define ISnumstart      0x04    /* 0-9 */
 602 #define IShspace        0x08    /* ' ' \t \f \v */
 603 #define ISspace         0x10    /* ' ' \t \f \v \n */
 604
 605 #define _dollar_ok(x)   ((x) == '$' && CPP_OPTIONS (pfile)->dollars_in_ident)
 606
 607 #define is_idchar(x)    ((_cpp_IStable[x] & ISidnum) || _dollar_ok(x))
 608 #define is_idstart(x)   ((_cpp_IStable[x] & ISidstart) || _dollar_ok(x))
 609 #define is_numchar(x)   (_cpp_IStable[x] & ISidnum)
 610 #define is_numstart(x)  (_cpp_IStable[x] & ISnumstart)
 611 #define is_hspace(x)    (_cpp_IStable[x] & IShspace)
 612 #define is_space(x)     (_cpp_IStable[x] & ISspace)
 613
 614 /* This table is constant if it can be initialized at compile time,
 615    which is the case if cpp was compiled with GCC >=2.7, or another
 616    compiler that supports C99.  */
 617 #if (GCC_VERSION >= 2007) || (__STDC_VERSION__ >= 199901L)
 618 extern const unsigned char _cpp_IStable[256];
 619 #else
 620 extern unsigned char _cpp_IStable[256];
 621 #endif
 622
 623 /* Stack of conditionals currently in progress
 624    (including both successful and failing conditionals).  */
 625
 626 struct if_stack {
 627   struct if_stack *next;        /* for chaining to the next stack frame */
 628   const char *fname;            /* copied from input when frame is made */
 629   int lineno;                   /* similarly */
 630   int if_succeeded;             /* true if a leg of this if-group
 631                                     has been passed through rescan */
 632   unsigned char *control_macro; /* For #ifndef at start of file,
 633                                    this is the macro name tested.  */
 634   enum node_type type;          /* type of last directive seen in this group */
 635 };
 636 typedef struct if_stack IF_STACK_FRAME;
 637
 638 extern void cpp_buf_line_and_col PARAMS((cpp_buffer *, long *, long *));
 639 extern cpp_buffer* cpp_file_buffer PARAMS((cpp_reader *));
 640 extern void cpp_define PARAMS ((cpp_reader *, unsigned char *));
 641 extern void cpp_assert PARAMS ((cpp_reader *, unsigned char *));
 642 extern void cpp_undef  PARAMS ((cpp_reader *, unsigned char *));
 643 extern void cpp_unassert PARAMS ((cpp_reader *, unsigned char *));
 644
 645 /* N.B. The error-message-printer prototypes have not been nicely
 646    formatted because exgettext needs to see 'msgid' on the same line
 647    as the name of the function in order to work properly.  Only the
 648    string argument gets a name in an effort to keep the lines from
 649    getting ridiculously oversized.  */
 650
 651 extern void cpp_ice PARAMS ((cpp_reader *, const char *msgid, ...))
 652   ATTRIBUTE_PRINTF_2;
 653 extern void cpp_fatal PARAMS ((cpp_reader *, const char *msgid, ...))
 654   ATTRIBUTE_PRINTF_2;
 655 extern void cpp_error PARAMS ((cpp_reader *, const char *msgid, ...))
 656   ATTRIBUTE_PRINTF_2;
 657 extern void cpp_warning PARAMS ((cpp_reader *, const char *msgid, ...))
 658   ATTRIBUTE_PRINTF_2;
 659 extern void cpp_pedwarn PARAMS ((cpp_reader *, const char *msgid, ...))
 660   ATTRIBUTE_PRINTF_2;
 661 extern void cpp_notice PARAMS ((cpp_reader *, const char *msgid, ...))
 662   ATTRIBUTE_PRINTF_2;
 663 extern void cpp_error_with_line PARAMS ((cpp_reader *, int, int, const char *msgid, ...))
 664   ATTRIBUTE_PRINTF_4;
 665 extern void cpp_warning_with_line PARAMS ((cpp_reader *, int, int, const char *msgid, ...))
 666   ATTRIBUTE_PRINTF_4;
 667 extern void cpp_pedwarn_with_line PARAMS ((cpp_reader *, int, int, const char *msgid, ...))
 668   ATTRIBUTE_PRINTF_4;
 669 extern void cpp_pedwarn_with_file_and_line PARAMS ((cpp_reader *, const char *, int, int, const char *msgid, ...))
 670   ATTRIBUTE_PRINTF_5;
 671 extern void cpp_error_from_errno PARAMS ((cpp_reader *, const char *));
 672 extern void cpp_notice_from_errno PARAMS ((cpp_reader *, const char *));
 673
 674 extern void cpp_grow_buffer PARAMS ((cpp_reader *, long));
 675 extern cpp_buffer *cpp_push_buffer PARAMS ((cpp_reader *,
 676                                             unsigned char *, long));
 677 extern cpp_buffer *cpp_pop_buffer PARAMS ((cpp_reader *));
 678 extern int cpp_defined PARAMS ((cpp_reader *, const U_CHAR *, int));
 679
 680 extern void cpp_reader_init PARAMS ((cpp_reader *));
 681 extern void cpp_options_init PARAMS ((cpp_options *));
 682 extern int cpp_start_read PARAMS ((cpp_reader *, char *));
 683 extern void cpp_finish PARAMS ((cpp_reader *));
 684
 685 extern void quote_string                PARAMS ((cpp_reader *, const char *));
 686 extern void cpp_expand_to_buffer        PARAMS ((cpp_reader *, const U_CHAR *,
 687                                                  int));
 688 extern void cpp_scan_buffer             PARAMS ((cpp_reader *));
 689
 690 /* Last arg to output_line_command.  */
 691 enum file_change_code {same_file, rename_file, enter_file, leave_file};
 692 extern void output_line_command         PARAMS ((cpp_reader *,
 693                                                  enum file_change_code));
 694
 695 /* In cppfiles.c */
 696 extern int cpp_included                 PARAMS ((cpp_reader *, const char *));
 697 extern int cpp_read_file                PARAMS ((cpp_reader *, const char *));
 698
 699 extern void _cpp_simplify_pathname      PARAMS ((char *));
 700 extern void _cpp_merge_include_chains   PARAMS ((struct cpp_options *));
 701 extern int _cpp_find_include_file       PARAMS ((cpp_reader *, const char *,
 702                                                 struct file_name_list *,
 703                                                 struct include_hash **,
 704                                                 int *));
 705 extern int _cpp_read_include_file       PARAMS ((cpp_reader *, int,
 706                                                 struct include_hash *));
 707
 708 /* In cppexp.c */
 709 extern HOST_WIDEST_INT _cpp_parse_expr  PARAMS ((cpp_reader *));
 710
 711
 712 #ifdef __cplusplus
 713 }
 714 #endif
 715 #endif /* __GCC_CPPLIB__ */