gcc/cpplib.h

   1 /* Definitions for CPP library.
   2    Copyright (C) 1995, 1996 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
  23 #include <sys/types.h>
  24 #include <sys/stat.h>
  25
  26 #ifdef __cplusplus
  27 extern "C" {
  28 #endif
  29
  30 typedef unsigned char U_CHAR;
  31
  32 typedef struct cpp_reader cpp_reader;
  33 typedef struct cpp_buffer cpp_buffer;
  34 typedef struct cpp_options cpp_options;
  35 typedef struct hashnode cpp_hashnode;
  36
  37 enum cpp_token {
  38   CPP_EOF = -1,
  39   CPP_OTHER = 0,
  40   CPP_COMMENT = 1,
  41   CPP_HSPACE,
  42   CPP_VSPACE, /* newlines and #line directives */
  43   CPP_NAME,
  44   CPP_NUMBER,
  45   CPP_CHAR,
  46   CPP_STRING,
  47   CPP_DIRECTIVE,
  48   CPP_LPAREN,   /* "(" */
  49   CPP_RPAREN,   /* ")" */
  50   CPP_LBRACE,   /* "{" */
  51   CPP_RBRACE,   /* "}" */
  52   CPP_COMMA,    /* "," */
  53   CPP_SEMICOLON,/* ";" */
  54   CPP_3DOTS,    /* "..." */
  55 #if 0
  56   CPP_ANDAND, /* "&&" */
  57   CPP_OROR,   /* "||" */
  58   CPP_LSH,    /* "<<" */
  59   CPP_RSH,    /* ">>" */
  60   CPP_EQL,    /* "==" */
  61   CPP_NEQ,    /* "!=" */
  62   CPP_LEQ,    /* "<=" */
  63   CPP_GEQ,    /* ">=" */
  64   CPP_PLPL,   /* "++" */
  65   CPP_MINMIN, /* "--" */
  66 #endif
  67   /* POP_TOKEN is returned when we've popped a cpp_buffer. */
  68   CPP_POP
  69 };
  70
  71 #ifndef PARAMS
  72 #ifdef __STDC
  73 #define PARAMS(P) P
  74 #else
  75 #define PARAMS(P) ()
  76 #endif
  77 #endif /* !PARAMS */
  78
  79 typedef enum cpp_token (*parse_underflow_t) PARAMS((cpp_reader *));
  80 typedef int (*parse_cleanup_t) PARAMS((cpp_buffer *, cpp_reader *));
  81
  82 /* A parse_marker indicates a previous position,
  83    which we can backtrack to. */
  84
  85 struct parse_marker {
  86   cpp_buffer *buf;
  87   struct parse_marker *next;
  88   int position;
  89 };
  90
  91 extern void parse_set_mark PARAMS ((struct parse_marker *, cpp_reader *));
  92 extern void parse_clear_mark PARAMS ((struct parse_marker *));
  93 extern void parse_goto_mark PARAMS((struct parse_marker *, cpp_reader *));
  94 extern void parse_move_mark PARAMS((struct parse_marker *, cpp_reader *));
  95
  96 extern int cpp_handle_options PARAMS ((cpp_reader *, int, char **));
  97 extern enum cpp_token cpp_get_token PARAMS ((struct parse_marker *));
  98 extern void cpp_skip_hspace PARAMS((cpp_reader *));
  99 extern enum cpp_token cpp_get_non_space_token PARAMS ((cpp_reader *));
 100
 101 /* This frees resources used by PFILE. */
 102 extern void cpp_cleanup PARAMS ((cpp_reader *PFILE));
 103
 104 /* Maintain and search list of included files, for #import.  */
 105
 106 #define IMPORT_HASH_SIZE 31
 107
 108 struct import_file {
 109   char *name;
 110   ino_t inode;
 111   dev_t dev;
 112   struct import_file *next;
 113 };
 114
 115 /* If we have a huge buffer, may need to cache more recent counts */
 116 #define CPP_LINE_BASE(BUF) ((BUF)->buf + (BUF)->line_base)
 117
 118 struct cpp_buffer {
 119   unsigned char *buf;
 120   unsigned char *cur;
 121   unsigned char *rlimit; /* end of valid data */
 122   unsigned char *alimit; /* end of allocated buffer */
 123   unsigned char *prev;  /* start of current token */
 124
 125   char *fname;
 126   /* Filename specified with #line command.  */
 127   char *nominal_fname;
 128
 129   /* Record where in the search path this file was found.
 130      For #include_next.  */
 131   struct file_name_list *dir;
 132
 133   long line_base;
 134   long lineno; /* Line number at CPP_LINE_BASE. */
 135   long colno; /* Column number at CPP_LINE_BASE. */
 136   parse_underflow_t underflow;
 137   parse_cleanup_t cleanup;
 138   void *data;
 139   struct parse_marker *marks;
 140   /* Value of if_stack at start of this file.
 141      Used to prohibit unmatched #endif (etc) in an include file.  */
 142   struct if_stack *if_stack;
 143
 144   /* True if this is a header file included using <FILENAME>.  */
 145   char system_header_p;
 146   char seen_eof;
 147
 148   /* True if buffer contains escape sequences.
 149      Currently there are three kinds:
 150      "@-" means following identifier should not be macro-expanded.
 151      "@ " means a token-separator.  This turns into " " in final output
 152           if not stringizing and needed to separate tokens; otherwise nothing.
 153      "@@" means a normal '@'.
 154      (An '@' inside a string stands for itself and is never an escape.) */
 155   char has_escapes;
 156 };
 157
 158 struct cpp_pending;  /* Forward declaration - for C++. */
 159 struct file_name_map_list;
 160
 161 typedef struct assertion_hashnode ASSERTION_HASHNODE;
 162 #define ASSERTION_HASHSIZE 37
 163
 164 /* Maximum nesting of cpp_buffers.  We use a static limit, partly for
 165    efficiency, and partly to limit runaway recursion.  */
 166 #define CPP_STACK_MAX 200
 167
 168 /* A cpp_reader encapsulates the "state" of a pre-processor run.
 169    Applying cpp_get_token repeatedly yields a stream of pre-processor
 170    tokens.  Usually, there is only one cpp_reader object active. */
 171
 172 struct cpp_reader {
 173   parse_underflow_t get_token;
 174   cpp_buffer *buffer;
 175   cpp_buffer buffer_stack[CPP_STACK_MAX];
 176
 177   int errors;                   /* Error counter for exit code */
 178   void *data;
 179
 180   /* A buffer used for both for cpp_get_token's output, and also internally. */
 181   unsigned char *token_buffer;
 182   /* Alocated size of token_buffer.  CPP_RESERVE allocates space.  */
 183   int token_buffer_size;
 184   /* End of the written part of token_buffer. */
 185   unsigned char *limit;
 186
 187   /* Line where a newline was first seen in a string constant.  */
 188   int multiline_string_line;
 189
 190   /* Current depth in #include directives that use <...>.  */
 191   int system_include_depth;
 192
 193   /* List of included files that contained #pragma once.  */
 194   struct file_name_list *dont_repeat_files;
 195
 196   /* List of other included files.
 197      If ->control_macro if nonzero, the file had a #ifndef
 198      around the entire contents, and ->control_macro gives the macro name.  */
 199   struct file_name_list *all_include_files;
 200
 201   /* Current maximum length of directory names in the search path
 202      for include files.  (Altered as we get more of them.)  */
 203   int max_include_len;
 204
 205   /* Hash table of files already included with #include or #import.  */
 206   struct import_file *import_hash_table[IMPORT_HASH_SIZE];
 207
 208   struct if_stack *if_stack;
 209
 210   /* Nonzero means we are inside an IF during a -pcp run.  In this mode
 211      macro expansion is done, and preconditions are output for all macro
 212      uses requiring them. */
 213   char pcp_inside_if;
 214
 215   /* Nonzero means we have printed (while error reporting) a list of
 216      containing files that matches the current status. */
 217   char input_stack_listing_current;
 218
 219   /* If non-zero, macros are not expanded. */
 220   char no_macro_expand;
 221
 222   /* Print column number in error messages. */
 223   char show_column;
 224
 225   /* We're printed a warning recommending against using #import. */
 226   char import_warning;
 227
 228   /* If true, character between '<' and '>' are a single (string) token. */
 229   char parsing_include_directive;
 230
 231   /* True if escape sequences (as described for has_escapes in
 232      parse_buffer) should be emitted. */
 233   char output_escapes;
 234
 235   /* 0: Have seen non-white-space on this line.
 236      1: Only seen white space so far on this line.
 237      2: Only seen white space so far in this file. */
 238    char only_seen_white;
 239
 240   /* Nonzero means this file was included with a -imacros or -include
 241      command line and should not be recorded as an include file.  */
 242
 243   int no_record_file;
 244
 245   long lineno;
 246
 247   struct tm *timebuf;
 248
 249   ASSERTION_HASHNODE *assertion_hashtab[ASSERTION_HASHSIZE];
 250
 251   /* Buffer of -M output.  */
 252   char *deps_buffer;
 253
 254   /* Number of bytes allocated in above.  */
 255   int deps_allocated_size;
 256
 257   /* Number of bytes used.  */
 258   int deps_size;
 259
 260   /* Number of bytes since the last newline.  */
 261   int deps_column;
 262
 263 #ifdef __cplusplus
 264   ~cpp_reader () { cpp_cleanup (this); }
 265 #endif
 266 };
 267
 268 #define CPP_FATAL_LIMIT 1000
 269 /* True if we have seen a "fatal" error. */
 270 #define CPP_FATAL_ERRORS(READER) ((READER)->errors >= CPP_FATAL_LIMIT)
 271
 272 #define CPP_BUF_PEEK(BUFFER) \
 273   ((BUFFER)->cur < (BUFFER)->rlimit ? *(BUFFER)->cur : EOF)
 274 #define CPP_BUF_GET(BUFFER) \
 275   ((BUFFER)->cur < (BUFFER)->rlimit ? *(BUFFER)->cur++ : EOF)
 276 #define CPP_FORWARD(BUFFER, N) ((BUFFER)->cur += (N))
 277
 278 /* Macros for manipulating the token_buffer. */
 279
 280 #define CPP_OUT_BUFFER(PFILE) ((PFILE)->token_buffer)
 281
 282 /* Number of characters currently in PFILE's output buffer. */
 283 #define CPP_WRITTEN(PFILE) ((PFILE)->limit - (PFILE)->token_buffer)
 284 #define CPP_PWRITTEN(PFILE) ((PFILE)->limit)
 285
 286 /* Make sure PFILE->token_buffer has space for at least N more characters. */
 287 #define CPP_RESERVE(PFILE, N) \
 288   (CPP_WRITTEN (PFILE) + N > (PFILE)->token_buffer_size \
 289    && (cpp_grow_buffer (PFILE, N), 0))
 290
 291 /* Append string STR (of length N) to PFILE's output buffer.
 292    Assume there is enough space. */
 293 #define CPP_PUTS_Q(PFILE, STR, N) \
 294   (bcopy (STR, (PFILE)->limit, (N)), (PFILE)->limit += (N))
 295 /* Append string STR (of length N) to PFILE's output buffer.  Make space. */
 296 #define CPP_PUTS(PFILE, STR, N) CPP_RESERVE(PFILE, N), CPP_PUTS_Q(PFILE, STR,N)
 297 /* Append character CH to PFILE's output buffer.  Assume sufficient space. */
 298 #define CPP_PUTC_Q(PFILE, CH) (*(PFILE)->limit++ = (CH))
 299 /* Append character CH to PFILE's output buffer.  Make space if need be. */
 300 #define CPP_PUTC(PFILE, CH) (CPP_RESERVE (PFILE, 1), CPP_PUTC_Q (PFILE, CH))
 301 /* Make sure PFILE->limit is followed by '\0'. */
 302 #define CPP_NUL_TERMINATE_Q(PFILE) (*(PFILE)->limit = 0)
 303 #define CPP_NUL_TERMINATE(PFILE) (CPP_RESERVE(PFILE, 1), *(PFILE)->limit = 0)
 304 #define CPP_ADJUST_WRITTEN(PFILE,DELTA) ((PFILE)->limit += (DELTA))
 305 #define CPP_SET_WRITTEN(PFILE,N) ((PFILE)->limit = (PFILE)->token_buffer + (N))
 306
 307 #define CPP_OPTIONS(PFILE) ((cpp_options *) (PFILE)->data)
 308
 309 #define CPP_BUFFER(PFILE) ((PFILE)->buffer)
 310 #define CPP_PREV_BUFFER(BUFFER) ((BUFFER)+1)
 311 /* The bottom of the buffer stack. */
 312 #define CPP_NULL_BUFFER(PFILE) (&(PFILE)->buffer_stack[CPP_STACK_MAX])
 313
 314 /* Pointed to by cpp_reader::data. */
 315 struct cpp_options {
 316   char *in_fname;
 317
 318   /* Name of output file, for error messages.  */
 319   char *out_fname;
 320
 321   struct file_name_map_list *map_list;
 322
 323   /* Non-0 means -v, so print the full set of include dirs.  */
 324   char verbose;
 325
 326   /* Nonzero means use extra default include directories for C++.  */
 327
 328   char cplusplus;
 329
 330   /* Nonzero means handle cplusplus style comments */
 331
 332   char cplusplus_comments;
 333
 334   /* Nonzero means handle #import, for objective C.  */
 335
 336   char objc;
 337
 338   /* Nonzero means this is an assembly file, and allow
 339      unknown directives, which could be comments.  */
 340
 341   int lang_asm;
 342
 343   /* Nonzero means turn NOTREACHED into #pragma NOTREACHED etc */
 344
 345   char for_lint;
 346
 347   /* Nonzero means handle CHILL comment syntax
 348      and output CHILL string delimiter for __DATE___ etc. */
 349
 350   char chill;
 351
 352   /* Nonzero means copy comments into the output file.  */
 353
 354   char put_out_comments;
 355
 356   /* Nonzero means don't process the ANSI trigraph sequences.  */
 357
 358   char no_trigraphs;
 359
 360   /* Nonzero means print the names of included files rather than
 361      the preprocessed output.  1 means just the #include "...",
 362      2 means #include <...> as well.  */
 363
 364   char print_deps;
 365
 366   /* Nonzero if missing .h files in -M output are assumed to be generated
 367      files and not errors.  */
 368
 369   char print_deps_missing_files;
 370
 371   /* If true, fopen (deps_file, "a") else fopen (deps_file, "w"). */
 372   char print_deps_append;
 373
 374   /* Nonzero means print names of header files (-H).  */
 375
 376   char print_include_names;
 377
 378   /* Nonzero means try to make failure to fit ANSI C an error.  */
 379
 380   char pedantic_errors;
 381
 382   /* Nonzero means don't print warning messages.  -w.  */
 383
 384   char inhibit_warnings;
 385
 386   /* Nonzero means warn if slash-star appears in a comment.  */
 387
 388   char warn_comments;
 389
 390   /* Nonzero means warn if there are any trigraphs.  */
 391
 392   char warn_trigraphs;
 393
 394   /* Nonzero means warn if #import is used.  */
 395
 396   char warn_import;
 397
 398   /* Nonzero means warn if a macro argument is (or would be)
 399      stringified with -traditional.  */
 400
 401   char warn_stringify;
 402
 403   /* Nonzero means turn warnings into errors.  */
 404
 405   char warnings_are_errors;
 406
 407   /* Nonzero causes output not to be done,
 408      but directives such as #define that have side effects
 409      are still obeyed.  */
 410
 411   char no_output;
 412
 413   /* Nonzero means don't output line number information.  */
 414
 415   char no_line_commands;
 416
 417 /* Nonzero means output the text in failing conditionals,
 418    inside #failed ... #endfailed.  */
 419
 420   char output_conditionals;
 421
 422   /* Nonzero means -I- has been seen,
 423      so don't look for #include "foo" the source-file directory.  */
 424   char ignore_srcdir;
 425
 426   /* Zero means dollar signs are punctuation.
 427      This used to be needed for conformance to the C Standard,
 428      before the C Standard was corrected.  */
 429   char dollars_in_ident;
 430
 431   /* Nonzero means try to imitate old fashioned non-ANSI preprocessor.  */
 432   char traditional;
 433
 434   /* Nonzero means give all the error messages the ANSI standard requires.  */
 435   char pedantic;
 436
 437   char done_initializing;
 438
 439   struct file_name_list *include;       /* First dir to search */
 440   /* First dir to search for <file> */
 441   /* This is the first element to use for #include <...>.
 442      If it is 0, use the entire chain for such includes.  */
 443   struct file_name_list *first_bracket_include;
 444   /* This is the first element in the chain that corresponds to
 445      a directory of system header files.  */
 446   struct file_name_list *first_system_include;
 447   struct file_name_list *last_include;  /* Last in chain */
 448
 449   /* Chain of include directories to put at the end of the other chain.  */
 450   struct file_name_list *after_include;
 451   struct file_name_list *last_after_include;    /* Last in chain */
 452
 453   /* Chain to put at the start of the system include files.  */
 454   struct file_name_list *before_system;
 455   struct file_name_list *last_before_system;    /* Last in chain */
 456
 457   /* Directory prefix that should replace `/usr' in the standard
 458      include file directories.  */
 459   char *include_prefix;
 460
 461   char inhibit_predefs;
 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   /* Pending -D, -U and -A options, in reverse order. */
 484   struct cpp_pending *pending;
 485
 486   /* File name which deps are being written to.
 487      This is 0 if deps are being written to stdout.  */
 488   char *deps_file;
 489
 490   /* Target-name to write with the dependency information.  */
 491   char *deps_target;
 492 };
 493
 494 #define CPP_TRADITIONAL(PFILE) (CPP_OPTIONS(PFILE)-> traditional)
 495 #define CPP_PEDANTIC(PFILE) (CPP_OPTIONS (PFILE)->pedantic)
 496 #define CPP_PRINT_DEPS(PFILE) (CPP_OPTIONS (PFILE)->print_deps)
 497
 498 /* Name under which this program was invoked.  */
 499
 500 extern char *progname;
 501
 502 /* The structure of a node in the hash table.  The hash table
 503    has entries for all tokens defined by #define commands (type T_MACRO),
 504    plus some special tokens like __LINE__ (these each have their own
 505    type, and the appropriate code is run when that type of node is seen.
 506    It does not contain control words like "#define", which are recognized
 507    by a separate piece of code. */
 508
 509 /* different flavors of hash nodes --- also used in keyword table */
 510 enum node_type {
 511  T_DEFINE = 1,  /* the `#define' keyword */
 512  T_INCLUDE,     /* the `#include' keyword */
 513  T_INCLUDE_NEXT, /* the `#include_next' keyword */
 514  T_IMPORT,      /* the `#import' keyword */
 515  T_IFDEF,       /* the `#ifdef' keyword */
 516  T_IFNDEF,      /* the `#ifndef' keyword */
 517  T_IF,          /* the `#if' keyword */
 518  T_ELSE,        /* `#else' */
 519  T_PRAGMA,      /* `#pragma' */
 520  T_ELIF,        /* `#elif' */
 521  T_UNDEF,       /* `#undef' */
 522  T_LINE,        /* `#line' */
 523  T_ERROR,       /* `#error' */
 524  T_WARNING,     /* `#warning' */
 525  T_ENDIF,       /* `#endif' */
 526  T_SCCS,        /* `#sccs', used on system V.  */
 527  T_IDENT,       /* `#ident', used on system V.  */
 528  T_ASSERT,      /* `#assert', taken from system V.  */
 529  T_UNASSERT,    /* `#unassert', taken from system V.  */
 530  T_SPECLINE,    /* special symbol `__LINE__' */
 531  T_DATE,        /* `__DATE__' */
 532  T_FILE,        /* `__FILE__' */
 533  T_BASE_FILE,   /* `__BASE_FILE__' */
 534  T_INCLUDE_LEVEL, /* `__INCLUDE_LEVEL__' */
 535  T_VERSION,     /* `__VERSION__' */
 536  T_SIZE_TYPE,   /* `__SIZE_TYPE__' */
 537  T_PTRDIFF_TYPE,   /* `__PTRDIFF_TYPE__' */
 538  T_WCHAR_TYPE,   /* `__WCHAR_TYPE__' */
 539  T_USER_LABEL_PREFIX_TYPE, /* `__USER_LABEL_PREFIX__' */
 540  T_REGISTER_PREFIX_TYPE,   /* `__REGISTER_PREFIX__' */
 541  T_TIME,        /* `__TIME__' */
 542  T_CONST,       /* Constant value, used by `__STDC__' */
 543  T_MACRO,       /* macro defined by `#define' */
 544  T_DISABLED,    /* macro temporarily turned off for rescan */
 545  T_SPEC_DEFINED, /* special `defined' macro for use in #if statements */
 546  T_PCSTRING,    /* precompiled string (hashval is KEYDEF *) */
 547  T_UNUSED       /* Used for something not defined.  */
 548  };
 549
 550 /* Structure returned by create_definition */
 551 typedef struct macrodef MACRODEF;
 552 struct macrodef
 553 {
 554   struct definition *defn;
 555   unsigned char *symnam;
 556   int symlen;
 557 };
 558
 559 /* Structure allocated for every #define.  For a simple replacement
 560    such as
 561         #define foo bar ,
 562    nargs = -1, the `pattern' list is null, and the expansion is just
 563    the replacement text.  Nargs = 0 means a functionlike macro with no args,
 564    e.g.,
 565        #define getchar() getc (stdin) .
 566    When there are args, the expansion is the replacement text with the
 567    args squashed out, and the reflist is a list describing how to
 568    build the output from the input: e.g., "3 chars, then the 1st arg,
 569    then 9 chars, then the 3rd arg, then 0 chars, then the 2nd arg".
 570    The chars here come from the expansion.  Whatever is left of the
 571    expansion after the last arg-occurrence is copied after that arg.
 572    Note that the reflist can be arbitrarily long---
 573    its length depends on the number of times the arguments appear in
 574    the replacement text, not how many args there are.  Example:
 575    #define f(x) x+x+x+x+x+x+x would have replacement text "++++++" and
 576    pattern list
 577      { (0, 1), (1, 1), (1, 1), ..., (1, 1), NULL }
 578    where (x, y) means (nchars, argno). */
 579
 580 typedef struct definition DEFINITION;
 581 struct definition {
 582   int nargs;
 583   int length;                   /* length of expansion string */
 584   int predefined;               /* True if the macro was builtin or */
 585                                 /* came from the command line */
 586   unsigned char *expansion;
 587   int line;                     /* Line number of definition */
 588   char *file;                   /* File of definition */
 589   char rest_args;               /* Nonzero if last arg. absorbs the rest */
 590   struct reflist {
 591     struct reflist *next;
 592     char stringify;             /* nonzero if this arg was preceded by a
 593                                    # operator. */
 594     char raw_before;            /* Nonzero if a ## operator before arg. */
 595     char raw_after;             /* Nonzero if a ## operator after arg. */
 596     char rest_args;             /* Nonzero if this arg. absorbs the rest */
 597     int nchars;                 /* Number of literal chars to copy before
 598                                    this arg occurrence.  */
 599     int argno;                  /* Number of arg to substitute (origin-0) */
 600   } *pattern;
 601   union {
 602     /* Names of macro args, concatenated in reverse order
 603        with comma-space between them.
 604        The only use of this is that we warn on redefinition
 605        if this differs between the old and new definitions.  */
 606     unsigned char *argnames;
 607   } args;
 608 };
 609
 610 extern unsigned char is_idchar[256];
 611
 612 /* Stack of conditionals currently in progress
 613    (including both successful and failing conditionals).  */
 614
 615 struct if_stack {
 616   struct if_stack *next;        /* for chaining to the next stack frame */
 617   char *fname;          /* copied from input when frame is made */
 618   int lineno;                   /* similarly */
 619   int if_succeeded;             /* true if a leg of this if-group
 620                                     has been passed through rescan */
 621   unsigned char *control_macro; /* For #ifndef at start of file,
 622                                    this is the macro name tested.  */
 623   enum node_type type;          /* type of last directive seen in this group */
 624 };
 625 typedef struct if_stack IF_STACK_FRAME;
 626
 627 extern void cpp_buf_line_and_col PARAMS((cpp_buffer *, long *, long *));
 628 extern cpp_buffer* cpp_file_buffer PARAMS((cpp_reader *));
 629 extern void cpp_define PARAMS ((cpp_reader*, unsigned char *));
 630
 631 extern void cpp_error ();
 632 extern void cpp_warning ();
 633 extern void cpp_pedwarn ();
 634 extern void cpp_error_with_line ();
 635 extern void cpp_pedwarn_with_line ();
 636 extern void cpp_pedwarn_with_file_and_line ();
 637 extern void fatal ();
 638 extern void cpp_error_from_errno ();
 639 extern void cpp_perror_with_name ();
 640 extern void cpp_pfatal_with_name ();
 641
 642 extern void cpp_grow_buffer PARAMS ((cpp_reader *, long));
 643 extern int cpp_parse_escape PARAMS ((cpp_reader *, char **));
 644 extern cpp_buffer *cpp_push_buffer PARAMS ((cpp_reader *,
 645                                             unsigned char *, long));
 646 extern cpp_buffer *cpp_pop_buffer PARAMS ((cpp_reader *));
 647
 648 extern cpp_hashnode *cpp_lookup PARAMS ((cpp_reader *, const unsigned char *,
 649                                          int, int));
 650
 651 #ifdef __cplusplus
 652 }
 653 #endif