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 struct cpp_reader cpp_reader;
  32 typedef struct cpp_buffer cpp_buffer;
  33 typedef struct cpp_options cpp_options;
  34
  35 enum cpp_token
  36 {
  37   CPP_EOF = -1,
  38   CPP_OTHER = 0,
  39   CPP_COMMENT = 1,
  40   CPP_HSPACE,
  41   CPP_VSPACE, /* newlines and #line directives */
  42   CPP_NAME,
  43   CPP_NUMBER,
  44   CPP_CHAR,
  45   CPP_WCHAR,
  46   CPP_STRING,
  47   CPP_WSTRING,
  48   CPP_DIRECTIVE,
  49   CPP_ASSERTION,        /* #machine(a29k) */
  50   CPP_STRINGIZE,        /* stringize macro argument */
  51   CPP_TOKPASTE,         /* paste macro arg with next/prev token */
  52   CPP_LPAREN,           /* "(" */
  53   CPP_RPAREN,           /* ")" */
  54   CPP_LBRACE,           /* "{" */
  55   CPP_RBRACE,           /* "}" */
  56   CPP_COMMA,            /* "," */
  57   CPP_SEMICOLON,        /* ";" */
  58   CPP_3DOTS,            /* "..." */
  59   CPP_POP               /* We're about to pop the buffer stack.  */
  60 };
  61
  62 typedef int (*parse_cleanup_t) PARAMS((cpp_buffer *, cpp_reader *));
  63
  64 struct cpp_buffer
  65 {
  66   unsigned char *cur;    /* current position */
  67   unsigned char *rlimit; /* end of valid data */
  68   unsigned char *buf;    /* entire buffer */
  69   unsigned char *alimit; /* end of allocated buffer */
  70   unsigned char *line_base; /* start of current line */
  71
  72   struct cpp_buffer *prev;
  73
  74   /* Filename specified with #line command.  */
  75   const char *nominal_fname;
  76   /* Last filename specified with #line command.  */
  77   const char *last_nominal_fname;
  78   /* Actual directory of this file, used only for "" includes */
  79   struct file_name_list *actual_dir;
  80
  81   /* Pointer into the include hash table.  Used for include_next and
  82      to record control macros. */
  83   struct ihash *ihash;
  84
  85   long lineno; /* Line number at CPP_LINE_BASE. */
  86   long colno; /* Column number at CPP_LINE_BASE. */
  87   long mark;  /* Saved position for lengthy backtrack. */
  88   parse_cleanup_t cleanup;
  89   void *data;
  90
  91   /* Value of if_stack at start of this file.
  92      Used to prohibit unmatched #endif (etc) in an include file.  */
  93   struct if_stack *if_stack;
  94
  95   /* True if this is a header file included using <FILENAME>.  */
  96   char system_header_p;
  97   char seen_eof;
  98
  99   /* True if buffer contains escape sequences.
 100      Currently there are two kinds:
 101      "\r-" means following identifier should not be macro-expanded.
 102      "\r " means a token-separator.  This turns into " " in final output
 103           if not stringizing and needed to separate tokens; otherwise nothing.
 104      Any other two-character sequence beginning with \r is an error.
 105
 106      If this is NOT set, then \r is a one-character escape meaning backslash
 107      newline.  This is guaranteed not to occur in the middle of a token.
 108      The two interpretations of \r do not conflict, because the two-character
 109      escapes are used only in macro buffers, and backslash-newline is removed
 110      from macro expansion text in collect_expansion and/or macarg.  */
 111   char has_escapes;
 112
 113   /* Used by the C++ frontend to implement redirected input (such as for
 114      default argument and/or template parsing).  */
 115   char manual_pop;
 116
 117   /* True if we have already warned about C++ comments in this file.
 118      The warning happens only for C89 extended mode with -pedantic on,
 119      and only once per file (otherwise it would be far too noisy).  */
 120   char warned_cplusplus_comments;
 121 };
 122
 123 struct file_name_map_list;
 124
 125 /* Maximum nesting of cpp_buffers.  We use a static limit, partly for
 126    efficiency, and partly to limit runaway recursion.  */
 127 #define CPP_STACK_MAX 200
 128
 129 /* A cpp_reader encapsulates the "state" of a pre-processor run.
 130    Applying cpp_get_token repeatedly yields a stream of pre-processor
 131    tokens.  Usually, there is only one cpp_reader object active. */
 132
 133 struct cpp_reader
 134 {
 135   cpp_buffer *buffer;
 136   cpp_options *opts;
 137
 138   /* A buffer used for both for cpp_get_token's output, and also internally. */
 139   unsigned char *token_buffer;
 140   /* Allocated size of token_buffer.  CPP_RESERVE allocates space.  */
 141   unsigned int token_buffer_size;
 142   /* End of the written part of token_buffer. */
 143   unsigned char *limit;
 144
 145   /* Error counter for exit code */
 146   int errors;
 147
 148   /* Line where a newline was first seen in a string constant.  */
 149   int multiline_string_line;
 150
 151   /* Current depth in #include directives that use <...>.  */
 152   int system_include_depth;
 153
 154   /* Current depth of buffer stack. */
 155   int buffer_stack_depth;
 156
 157   /* Hash table of macros and assertions.  See cpphash.c */
 158 #define HASHSIZE 1403
 159   struct hashnode **hashtab;
 160
 161   /* Hash table of other included files.  See cppfiles.c */
 162 #define ALL_INCLUDE_HASHSIZE 71
 163   struct ihash *all_include_files[ALL_INCLUDE_HASHSIZE];
 164
 165   /* Chain of `actual directory' file_name_list entries,
 166      for "" inclusion. */
 167   struct file_name_list *actual_dirs;
 168
 169   /* Current maximum length of directory names in the search path
 170      for include files.  (Altered as we get more of them.)  */
 171   unsigned int max_include_len;
 172
 173   struct if_stack *if_stack;
 174
 175   /* Nonzero means we have printed (while error reporting) a list of
 176      containing files that matches the current status.  */
 177   char input_stack_listing_current;
 178
 179   /* If non-zero, macros are not expanded.  */
 180   char no_macro_expand;
 181
 182   /* If non-zero, directives cause a hard error.  Used when parsing
 183      macro arguments.  */
 184   char no_directives;
 185
 186   /* Print column number in error messages.  */
 187   char show_column;
 188
 189   /* We're printed a warning recommending against using #import.  */
 190   char import_warning;
 191
 192   /* If true, character between '<' and '>' are a single (string) token.  */
 193   char parsing_include_directive;
 194
 195   /* If true, # introduces an assertion (see do_assert) */
 196   char parsing_if_directive;
 197
 198   /* If true, # and ## are the STRINGIZE and TOKPASTE operators */
 199   char parsing_define_directive;
 200
 201   /* True if escape sequences (as described for has_escapes in
 202      parse_buffer) should be emitted.  */
 203   char output_escapes;
 204
 205   /* 0: Have seen non-white-space on this line.
 206      1: Only seen white space so far on this line.
 207      2: Only seen white space so far in this file.  */
 208   char only_seen_white;
 209
 210   long lineno;
 211
 212   struct tm *timebuf;
 213
 214   /* Buffer of -M output.  */
 215   struct deps *deps;
 216
 217   /* A buffer and a table, used only by read_and_prescan (in cppfiles.c)
 218      which are allocated once per cpp_reader object to keep them off the
 219      stack and avoid setup costs.  */
 220   unsigned char *input_buffer;
 221   unsigned char *input_speccase;
 222   size_t input_buffer_len;
 223 };
 224
 225 #define CPP_FATAL_LIMIT 1000
 226 /* True if we have seen a "fatal" error. */
 227 #define CPP_FATAL_ERRORS(READER) ((READER)->errors >= CPP_FATAL_LIMIT)
 228
 229 /* Macros for manipulating the token_buffer. */
 230
 231 /* Number of characters currently in PFILE's output buffer. */
 232 #define CPP_WRITTEN(PFILE) ((size_t)((PFILE)->limit - (PFILE)->token_buffer))
 233 #define CPP_PWRITTEN(PFILE) ((PFILE)->limit)
 234 #define CPP_ADJUST_WRITTEN(PFILE,DELTA) ((PFILE)->limit += (DELTA))
 235 #define CPP_SET_WRITTEN(PFILE,N) ((PFILE)->limit = (PFILE)->token_buffer + (N))
 236
 237 /* Make sure PFILE->token_buffer has space for at least N more characters. */
 238 #define CPP_RESERVE(PFILE, N) \
 239   (CPP_WRITTEN (PFILE) + (size_t)(N) > (PFILE)->token_buffer_size \
 240    && (cpp_grow_buffer (PFILE, N), 0))
 241
 242 #define CPP_OPTIONS(PFILE) ((PFILE)->opts)
 243 #define CPP_BUFFER(PFILE) ((PFILE)->buffer)
 244
 245 /* Pointed to by cpp_reader.opts. */
 246 struct cpp_options
 247 {
 248   char *in_fname;
 249
 250   /* Name of output file, for error messages.  */
 251   const char *out_fname;
 252
 253   struct file_name_map_list *map_list;
 254
 255   /* Non-0 means -v, so print the full set of include dirs.  */
 256   char verbose;
 257
 258   /* Nonzero means use extra default include directories for C++.  */
 259
 260   char cplusplus;
 261
 262   /* Nonzero means handle cplusplus style comments */
 263
 264   char cplusplus_comments;
 265
 266   /* Nonzero means handle #import, for objective C.  */
 267
 268   char objc;
 269
 270   /* Nonzero means this is an assembly file, so ignore unrecognized
 271      directives and the "# 33" form of #line, both of which are
 272      probably comments.  Also, permit unbalanced ' strings (again,
 273      likely to be in comments).  */
 274
 275   char lang_asm;
 276
 277   /* Nonzero means this is Fortran, and we don't know where the
 278      comments are, so permit unbalanced ' strings.  Unlike lang_asm,
 279      this does not ignore unrecognized directives.  */
 280
 281   char lang_fortran;
 282
 283   /* Nonzero means handle CHILL comment syntax
 284      and output CHILL string delimiter for __DATE___ etc. */
 285
 286   char chill;
 287
 288   /* Nonzero means don't copy comments into the output file.  */
 289
 290   char discard_comments;
 291
 292   /* Nonzero means process the ANSI trigraph sequences.  */
 293
 294   char trigraphs;
 295
 296   /* Nonzero means print the names of included files rather than
 297      the preprocessed output.  1 means just the #include "...",
 298      2 means #include <...> as well.  */
 299
 300   char print_deps;
 301
 302   /* Nonzero if missing .h files in -M output are assumed to be generated
 303      files and not errors.  */
 304
 305   char print_deps_missing_files;
 306
 307   /* If true, fopen (deps_file, "a") else fopen (deps_file, "w"). */
 308   char print_deps_append;
 309
 310   /* Nonzero means print names of header files (-H).  */
 311
 312   char print_include_names;
 313
 314   /* Nonzero means try to make failure to fit ANSI C an error.  */
 315
 316   char pedantic_errors;
 317
 318   /* Nonzero means don't print warning messages.  */
 319
 320   char inhibit_warnings;
 321
 322   /* Nonzero means don't print error messages.  Has no option to select it,
 323      but can be set by a user of cpplib (e.g. fix-header).  */
 324
 325   char inhibit_errors;
 326
 327   /* Nonzero means warn if slash-star appears in a comment.  */
 328
 329   char warn_comments;
 330
 331   /* Nonzero means warn if there are any trigraphs.  */
 332
 333   char warn_trigraphs;
 334
 335   /* Nonzero means warn if #import is used.  */
 336
 337   char warn_import;
 338
 339   /* Nonzero means warn if a macro argument is (or would be)
 340      stringified with -traditional.  */
 341
 342   char warn_stringify;
 343
 344   /* Nonzero means turn warnings into errors.  */
 345
 346   char warnings_are_errors;
 347
 348   /* Nonzero causes output not to be done,
 349      but directives such as #define that have side effects
 350      are still obeyed.  */
 351
 352   char no_output;
 353
 354   /* Nonzero means we should look for header.gcc files that remap file
 355      names.  */
 356   char remap;
 357
 358   /* Nonzero means don't output line number information.  */
 359   char no_line_commands;
 360
 361   /* Nonzero means -I- has been seen,
 362      so don't look for #include "foo" the source-file directory.  */
 363   char ignore_srcdir;
 364
 365   /* Zero means dollar signs are punctuation.
 366      This used to be needed for conformance to the C Standard,
 367      before the C Standard was corrected.  */
 368   char dollars_in_ident;
 369
 370   /* Nonzero means try to imitate old fashioned non-ANSI preprocessor.  */
 371   char traditional;
 372
 373   /* Nonzero means warn if undefined identifiers are evaluated in an #if.  */
 374   char warn_undef;
 375
 376   /* Nonzero for the 1989 C Standard, including corrigenda and amendments.  */
 377   char c89;
 378
 379   /* Nonzero for the 1999 C Standard, including corrigenda and amendments.  */
 380   char c99;
 381
 382   /* Nonzero means give all the error messages the ANSI standard requires.  */
 383   char pedantic;
 384
 385   /* Nonzero means we're looking at already preprocessed code, so don't
 386      bother trying to do macro expansion and whatnot.  */
 387   char preprocessed;
 388
 389   char done_initializing;
 390
 391   /* Search paths for include files.  */
 392   struct file_name_list *quote_include;  /* First dir to search for "file" */
 393   struct file_name_list *bracket_include;/* First dir to search for <file> */
 394
 395   /* Directory prefix that should replace `/usr/lib/gcc-lib/TARGET/VERSION'
 396      in the standard include file directories.  */
 397   char *include_prefix;
 398   int include_prefix_len;
 399
 400   char no_standard_includes;
 401   char no_standard_cplusplus_includes;
 402
 403 /* dump_only means inhibit output of the preprocessed text
 404              and instead output the definitions of all user-defined
 405              macros in a form suitable for use as input to cccp.
 406    dump_names means pass #define and the macro name through to output.
 407    dump_definitions means pass the whole definition (plus #define) through
 408 */
 409
 410   enum {dump_none = 0, dump_only, dump_names, dump_definitions}
 411      dump_macros;
 412
 413 /* Nonzero means pass all #define and #undef directives which we actually
 414    process through to the output stream.  This feature is used primarily
 415    to allow cc1 to record the #defines and #undefs for the sake of
 416    debuggers which understand about preprocessor macros, but it may
 417    also be useful with -E to figure out how symbols are defined, and
 418    where they are defined.  */
 419   int debug_output;
 420
 421   /* Nonzero means pass #include lines through to the output,
 422      even if they are ifdefed out.  */
 423   int dump_includes;
 424
 425   /* Pending options - -D, -U, -A, -I, -ixxx. */
 426   struct cpp_pending *pending;
 427
 428   /* File name which deps are being written to.
 429      This is 0 if deps are being written to stdout.  */
 430   char *deps_file;
 431
 432   /* Target-name to write with the dependency information.  */
 433   char *deps_target;
 434 };
 435
 436 /* Name under which this program was invoked.  */
 437 extern const char *progname;
 438
 439 extern int cpp_handle_options PARAMS ((cpp_reader *, int, char **));
 440 extern enum cpp_token cpp_get_token PARAMS ((cpp_reader *));
 441 extern enum cpp_token cpp_get_non_space_token PARAMS ((cpp_reader *));
 442 extern enum cpp_token get_directive_token PARAMS ((cpp_reader *));
 443
 444 extern void cpp_reader_init PARAMS ((cpp_reader *));
 445 extern void cpp_options_init PARAMS ((cpp_options *));
 446 extern int cpp_start_read PARAMS ((cpp_reader *, char *));
 447 extern void cpp_finish PARAMS ((cpp_reader *));
 448 extern void cpp_cleanup PARAMS ((cpp_reader *PFILE));
 449
 450 extern void cpp_buf_line_and_col PARAMS((cpp_buffer *, long *, long *));
 451 extern cpp_buffer *cpp_file_buffer PARAMS((cpp_reader *));
 452 extern void cpp_define PARAMS ((cpp_reader *, unsigned char *));
 453 extern void cpp_assert PARAMS ((cpp_reader *, unsigned char *));
 454 extern void cpp_undef  PARAMS ((cpp_reader *, unsigned char *));
 455 extern void cpp_unassert PARAMS ((cpp_reader *, unsigned char *));
 456
 457 /* N.B. The error-message-printer prototypes have not been nicely
 458    formatted because exgettext needs to see 'msgid' on the same line
 459    as the name of the function in order to work properly.  Only the
 460    string argument gets a name in an effort to keep the lines from
 461    getting ridiculously oversized.  */
 462
 463 extern void cpp_ice PARAMS ((cpp_reader *, const char *msgid, ...))
 464   ATTRIBUTE_PRINTF_2;
 465 extern void cpp_fatal PARAMS ((cpp_reader *, const char *msgid, ...))
 466   ATTRIBUTE_PRINTF_2;
 467 extern void cpp_error PARAMS ((cpp_reader *, const char *msgid, ...))
 468   ATTRIBUTE_PRINTF_2;
 469 extern void cpp_warning PARAMS ((cpp_reader *, const char *msgid, ...))
 470   ATTRIBUTE_PRINTF_2;
 471 extern void cpp_pedwarn PARAMS ((cpp_reader *, const char *msgid, ...))
 472   ATTRIBUTE_PRINTF_2;
 473 extern void cpp_notice PARAMS ((cpp_reader *, const char *msgid, ...))
 474   ATTRIBUTE_PRINTF_2;
 475 extern void cpp_error_with_line PARAMS ((cpp_reader *, int, int, const char *msgid, ...))
 476   ATTRIBUTE_PRINTF_4;
 477 extern void cpp_warning_with_line PARAMS ((cpp_reader *, int, int, const char *msgid, ...))
 478   ATTRIBUTE_PRINTF_4;
 479 extern void cpp_pedwarn_with_line PARAMS ((cpp_reader *, int, int, const char *msgid, ...))
 480   ATTRIBUTE_PRINTF_4;
 481 extern void cpp_pedwarn_with_file_and_line PARAMS ((cpp_reader *, const char *, int, int, const char *msgid, ...))
 482   ATTRIBUTE_PRINTF_5;
 483 extern void cpp_error_from_errno PARAMS ((cpp_reader *, const char *));
 484 extern void cpp_notice_from_errno PARAMS ((cpp_reader *, const char *));
 485
 486 extern void cpp_grow_buffer PARAMS ((cpp_reader *, long));
 487 extern cpp_buffer *cpp_push_buffer PARAMS ((cpp_reader *,
 488                                             unsigned char *, long));
 489 extern cpp_buffer *cpp_pop_buffer PARAMS ((cpp_reader *));
 490 extern int cpp_defined PARAMS ((cpp_reader *, const unsigned char *, int));
 491
 492 extern void quote_string                PARAMS ((cpp_reader *, const char *));
 493 extern void cpp_expand_to_buffer        PARAMS ((cpp_reader *,
 494                                                  const unsigned char *, int));
 495 extern void cpp_scan_buffer             PARAMS ((cpp_reader *));
 496
 497 /* Last arg to output_line_command.  */
 498 enum file_change_code {same_file, rename_file, enter_file, leave_file};
 499 extern void output_line_command         PARAMS ((cpp_reader *,
 500                                                  enum file_change_code));
 501
 502 /* In cppfiles.c */
 503 extern int cpp_included                 PARAMS ((cpp_reader *, const char *));
 504 extern int cpp_read_file                PARAMS ((cpp_reader *, const char *));
 505
 506
 507 #ifdef __cplusplus
 508 }
 509 #endif
 510 #endif /* __GCC_CPPLIB__ */