gcc/cpphash.h

   1 /* Part of CPP library.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002
   3    Free Software Foundation, Inc.
   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 /* This header defines all the internal data structures and functions
  20    that need to be visible across files.  It's called cpphash.h for
  21    historical reasons.  */
  22
  23 #ifndef GCC_CPPHASH_H
  24 #define GCC_CPPHASH_H
  25
  26 #include "hashtable.h"
  27
  28 struct directive;               /* Deliberately incomplete.  */
  29 struct pending_option;
  30 struct op;
  31
  32 typedef unsigned HOST_WIDE_INT cpp_num_part;
  33 typedef unsigned char uchar;
  34 #define U (const uchar *)  /* Intended use: U"string" */
  35
  36 #define BITS_PER_CPPCHAR_T (CHAR_BIT * sizeof (cppchar_t))
  37
  38 /* Test if a sign is valid within a preprocessing number.  */
  39 #define VALID_SIGN(c, prevc) \
  40   (((c) == '+' || (c) == '-') && \
  41    ((prevc) == 'e' || (prevc) == 'E' \
  42     || (((prevc) == 'p' || (prevc) == 'P') \
  43         && CPP_OPTION (pfile, extended_numbers))))
  44
  45 #define CPP_OPTION(PFILE, OPTION) ((PFILE)->opts.OPTION)
  46 #define CPP_BUFFER(PFILE) ((PFILE)->buffer)
  47 #define CPP_BUF_COLUMN(BUF, CUR) ((CUR) - (BUF)->line_base + (BUF)->col_adjust)
  48 #define CPP_BUF_COL(BUF) CPP_BUF_COLUMN(BUF, (BUF)->cur)
  49
  50 /* Maximum nesting of cpp_buffers.  We use a static limit, partly for
  51    efficiency, and partly to limit runaway recursion.  */
  52 #define CPP_STACK_MAX 200
  53
  54 /* Each macro definition is recorded in a cpp_macro structure.
  55    Variadic macros cannot occur with traditional cpp.  */
  56 struct cpp_macro
  57 {
  58   cpp_hashnode **params;        /* Parameters, if any.  */
  59   union
  60   {
  61     cpp_token *tokens;          /* Tokens of replacement list (ISO).  */
  62     const uchar *text;          /* Expansion text (traditional).  */
  63   } exp;
  64   unsigned int line;            /* Starting line number.  */
  65   unsigned int count;           /* Number of tokens / bytes in expansion.  */
  66   unsigned short paramc;        /* Number of parameters.  */
  67   unsigned int fun_like : 1;    /* If a function-like macro.  */
  68   unsigned int variadic : 1;    /* If a variadic macro.  */
  69   unsigned int syshdr   : 1;    /* If macro defined in system header.  */
  70 };
  71
  72 /* A generic memory buffer, and operations on it.  */
  73 typedef struct _cpp_buff _cpp_buff;
  74 struct _cpp_buff
  75 {
  76   struct _cpp_buff *next;
  77   unsigned char *base, *cur, *limit;
  78 };
  79
  80 extern _cpp_buff *_cpp_get_buff PARAMS ((cpp_reader *, size_t));
  81 extern void _cpp_release_buff PARAMS ((cpp_reader *, _cpp_buff *));
  82 extern void _cpp_extend_buff PARAMS ((cpp_reader *, _cpp_buff **, size_t));
  83 extern _cpp_buff *_cpp_append_extend_buff PARAMS ((cpp_reader *, _cpp_buff *,
  84                                                    size_t));
  85 extern void _cpp_free_buff PARAMS ((_cpp_buff *));
  86 extern unsigned char *_cpp_aligned_alloc PARAMS ((cpp_reader *, size_t));
  87 extern unsigned char *_cpp_unaligned_alloc PARAMS ((cpp_reader *, size_t));
  88
  89 #define BUFF_ROOM(BUFF) (size_t) ((BUFF)->limit - (BUFF)->cur)
  90 #define BUFF_FRONT(BUFF) ((BUFF)->cur)
  91 #define BUFF_LIMIT(BUFF) ((BUFF)->limit)
  92
  93 /* List of directories to look for include files in.  */
  94 struct search_path
  95 {
  96   struct search_path *next;
  97
  98   /* NOTE: NAME may not be null terminated for the case of the current
  99      file's directory!  */
 100   const char *name;
 101   unsigned int len;
 102   /* We use these to tell if the directory mentioned here is a duplicate
 103      of an earlier directory on the search path.  */
 104   ino_t ino;
 105   dev_t dev;
 106   /* Non-zero if it is a system include directory.  */
 107   int sysp;
 108   /* Mapping of file names for this directory.  Only used on MS-DOS
 109      and related platforms.  */
 110   struct file_name_map *name_map;
 111 };
 112
 113 /* #include types.  */
 114 enum include_type {IT_INCLUDE, IT_INCLUDE_NEXT, IT_IMPORT, IT_CMDLINE};
 115
 116 union utoken
 117 {
 118   const cpp_token *token;
 119   const cpp_token **ptoken;
 120 };
 121
 122 /* A "run" of tokens; part of a chain of runs.  */
 123 typedef struct tokenrun tokenrun;
 124 struct tokenrun
 125 {
 126   tokenrun *next, *prev;
 127   cpp_token *base, *limit;
 128 };
 129
 130 typedef struct cpp_context cpp_context;
 131 struct cpp_context
 132 {
 133   /* Doubly-linked list.  */
 134   cpp_context *next, *prev;
 135
 136   /* Contexts other than the base context are contiguous tokens.
 137      e.g. macro expansions, expanded argument tokens.  */
 138   union utoken first;
 139   union utoken last;
 140
 141   /* If non-NULL, a buffer used for storage related to this context.
 142      When the context is popped, the buffer is released.  */
 143   _cpp_buff *buff;
 144
 145   /* For a macro context, the macro node, otherwise NULL.  */
 146   cpp_hashnode *macro;
 147
 148   /* True if utoken element is token, else ptoken.  */
 149   bool direct_p;
 150 };
 151
 152 struct lexer_state
 153 {
 154   /* Nonzero if first token on line is CPP_HASH.  */
 155   unsigned char in_directive;
 156
 157   /* True if we are skipping a failed conditional group.  */
 158   unsigned char skipping;
 159
 160   /* Nonzero if in a directive that takes angle-bracketed headers.  */
 161   unsigned char angled_headers;
 162
 163   /* Nonzero to save comments.  Turned off if discard_comments, and in
 164      all directives apart from #define.  */
 165   unsigned char save_comments;
 166
 167   /* Nonzero if we're mid-comment.  */
 168   unsigned char lexing_comment;
 169
 170   /* Nonzero if lexing __VA_ARGS__ is valid.  */
 171   unsigned char va_args_ok;
 172
 173   /* Nonzero if lexing poisoned identifiers is valid.  */
 174   unsigned char poisoned_ok;
 175
 176   /* Nonzero to prevent macro expansion.  */
 177   unsigned char prevent_expansion;
 178
 179   /* Nonzero when parsing arguments to a function-like macro.  */
 180   unsigned char parsing_args;
 181
 182   /* Nonzero to skip evaluating part of an expression.  */
 183   unsigned int skip_eval;
 184 };
 185
 186 /* Special nodes - identifiers with predefined significance.  */
 187 struct spec_nodes
 188 {
 189   cpp_hashnode *n_defined;              /* defined operator */
 190   cpp_hashnode *n_true;                 /* C++ keyword true */
 191   cpp_hashnode *n_false;                /* C++ keyword false */
 192   cpp_hashnode *n__VA_ARGS__;           /* C99 vararg macros */
 193 };
 194
 195 /* Represents the contents of a file cpplib has read in.  */
 196 struct cpp_buffer
 197 {
 198   const unsigned char *cur;      /* current position */
 199   const unsigned char *backup_to; /* if peeked character is not wanted */
 200   const unsigned char *rlimit; /* end of valid data */
 201   const unsigned char *line_base; /* start of current line */
 202
 203   struct cpp_buffer *prev;
 204
 205   const unsigned char *buf;      /* Entire character buffer.  */
 206
 207   /* Pointer into the include table; non-NULL if this is a file
 208      buffer.  Used for include_next and to record control macros.  */
 209   struct include_file *inc;
 210
 211   /* Value of if_stack at start of this file.
 212      Used to prohibit unmatched #endif (etc) in an include file.  */
 213   struct if_stack *if_stack;
 214
 215   /* Token column position adjustment owing to tabs in whitespace.  */
 216   unsigned int col_adjust;
 217
 218   /* Contains PREV_WHITE and/or AVOID_LPASTE.  */
 219   unsigned char saved_flags;
 220
 221   /* Because of the way the lexer works, -Wtrigraphs can sometimes
 222      warn twice for the same trigraph.  This helps prevent that.  */
 223   const unsigned char *last_Wtrigraphs;
 224
 225   /* True if we have already warned about C++ comments in this file.
 226      The warning happens only for C89 extended mode with -pedantic on,
 227      or for -Wtraditional, and only once per file (otherwise it would
 228      be far too noisy).  */
 229   unsigned char warned_cplusplus_comments;
 230
 231   /* True if we don't process trigraphs and escaped newlines.  True
 232      for preprocessed input, command line directives, and _Pragma
 233      buffers.  */
 234   unsigned char from_stage3;
 235
 236   /* Nonzero means that the directory to start searching for ""
 237      include files has been calculated and stored in "dir" below.  */
 238   unsigned char search_cached;
 239
 240   /* At EOF, a buffer is automatically popped.  If RETURN_AT_EOF is
 241      true, a CPP_EOF token is then returned.  Otherwise, the next
 242      token from the enclosing buffer is returned.  */
 243   bool return_at_eof;
 244
 245   /* The directory of the this buffer's file.  Its NAME member is not
 246      allocated, so we don't need to worry about freeing it.  */
 247   struct search_path dir;
 248
 249   /* Used for buffer overlays by cpptrad.c.  */
 250   const uchar *saved_cur, *saved_rlimit, *saved_line_base;
 251 };
 252
 253 /* A cpp_reader encapsulates the "state" of a pre-processor run.
 254    Applying cpp_get_token repeatedly yields a stream of pre-processor
 255    tokens.  Usually, there is only one cpp_reader object active.  */
 256 struct cpp_reader
 257 {
 258   /* Top of buffer stack.  */
 259   cpp_buffer *buffer;
 260
 261   /* Lexer state.  */
 262   struct lexer_state state;
 263
 264   /* Source line tracking.  */
 265   struct line_maps line_maps;
 266   const struct line_map *map;
 267   unsigned int line;
 268
 269   /* The line of the '#' of the current directive.  */
 270   unsigned int directive_line;
 271
 272   /* Memory buffers.  */
 273   _cpp_buff *a_buff;            /* Aligned permanent storage.  */
 274   _cpp_buff *u_buff;            /* Unaligned permanent storage.  */
 275   _cpp_buff *free_buffs;        /* Free buffer chain.  */
 276
 277   /* Context stack.  */
 278   struct cpp_context base_context;
 279   struct cpp_context *context;
 280
 281   /* If in_directive, the directive if known.  */
 282   const struct directive *directive;
 283
 284   /* The next -include-d file; NULL if they all are done.  If it
 285      points to NULL, the last one is in progress, and
 286      _cpp_maybe_push_include_file has yet to restore the line map.  */
 287   struct pending_option **next_include_file;
 288
 289   /* Multiple inlcude optimisation.  */
 290   const cpp_hashnode *mi_cmacro;
 291   const cpp_hashnode *mi_ind_cmacro;
 292   bool mi_valid;
 293
 294   /* Lexing.  */
 295   cpp_token *cur_token;
 296   tokenrun base_run, *cur_run;
 297   unsigned int lookaheads;
 298
 299   /* Non-zero prevents the lexer from re-using the token runs.  */
 300   unsigned int keep_tokens;
 301
 302   /* Error counter for exit code.  */
 303   unsigned int errors;
 304
 305   /* Buffer to hold macro definition string.  */
 306   unsigned char *macro_buffer;
 307   unsigned int macro_buffer_len;
 308
 309   /* Tree of other included files.  See cppfiles.c.  */
 310   struct splay_tree_s *all_include_files;
 311
 312   /* Current maximum length of directory names in the search path
 313      for include files.  (Altered as we get more of them.)  */
 314   unsigned int max_include_len;
 315
 316   /* Date and time tokens.  Calculated together if either is requested.  */
 317   cpp_token date;
 318   cpp_token time;
 319
 320   /* EOF token, and a token forcing paste avoidance.  */
 321   cpp_token avoid_paste;
 322   cpp_token eof;
 323
 324   /* Opaque handle to the dependencies of mkdeps.c.  Used by -M etc.  */
 325   struct deps *deps;
 326
 327   /* Obstack holding all macro hash nodes.  This never shrinks.
 328      See cpphash.c */
 329   struct obstack hash_ob;
 330
 331   /* Obstack holding buffer and conditional structures.  This is a
 332      real stack.  See cpplib.c.  */
 333   struct obstack buffer_ob;
 334
 335   /* Pragma table - dynamic, because a library user can add to the
 336      list of recognized pragmas.  */
 337   struct pragma_entry *pragmas;
 338
 339   /* Call backs.  */
 340   struct cpp_callbacks cb;
 341
 342   /* Identifier hash table.  */
 343   struct ht *hash_table;
 344
 345   /* Expression parser stack.  */
 346   struct op *op_stack, *op_limit;
 347
 348   /* User visible options.  */
 349   struct cpp_options opts;
 350
 351   /* Special nodes - identifiers with predefined significance to the
 352      preprocessor.  */
 353   struct spec_nodes spec_nodes;
 354
 355   /* Whether to print our version number.  Done this way so
 356      we don't get it twice for -v -version.  */
 357   unsigned char print_version;
 358
 359   /* Whether cpplib owns the hashtable.  */
 360   unsigned char our_hashtable;
 361
 362   /* Traditional preprocessing output buffer.  */
 363   uchar *trad_out_base, *trad_out_limit;
 364   uchar *trad_out_cur;
 365   unsigned int trad_line;
 366 };
 367
 368 /* Character classes.  Based on the more primitive macros in safe-ctype.h.
 369    If the definition of `numchar' looks odd to you, please look up the
 370    definition of a pp-number in the C standard [section 6.4.8 of C99].
 371
 372    In the unlikely event that characters other than \r and \n enter
 373    the set is_vspace, the macro handle_newline() in cpplex.c must be
 374    updated.  */
 375 #define _dollar_ok(x)   ((x) == '$' && CPP_OPTION (pfile, dollars_in_ident))
 376
 377 #define is_idchar(x)    (ISIDNUM(x) || _dollar_ok(x))
 378 #define is_numchar(x)   ISIDNUM(x)
 379 #define is_idstart(x)   (ISIDST(x) || _dollar_ok(x))
 380 #define is_numstart(x)  ISDIGIT(x)
 381 #define is_hspace(x)    ISBLANK(x)
 382 #define is_vspace(x)    IS_VSPACE(x)
 383 #define is_nvspace(x)   IS_NVSPACE(x)
 384 #define is_space(x)     IS_SPACE_OR_NUL(x)
 385
 386 /* This table is constant if it can be initialized at compile time,
 387    which is the case if cpp was compiled with GCC >=2.7, or another
 388    compiler that supports C99.  */
 389 #if HAVE_DESIGNATED_INITIALIZERS
 390 extern const unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];
 391 #else
 392 extern unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];
 393 #endif
 394
 395 /* Macros.  */
 396
 397 #define CPP_PRINT_DEPS(PFILE) CPP_OPTION (PFILE, print_deps)
 398 #define CPP_IN_SYSTEM_HEADER(PFILE) ((PFILE)->map && (PFILE)->map->sysp)
 399 #define CPP_PEDANTIC(PF) CPP_OPTION (PF, pedantic)
 400 #define CPP_WTRADITIONAL(PF) CPP_OPTION (PF, warn_traditional)
 401
 402 /* In cpperror.c  */
 403 extern int _cpp_begin_message PARAMS ((cpp_reader *, int,
 404                                        unsigned int, unsigned int));
 405
 406 /* In cppmacro.c */
 407 extern void _cpp_free_definition        PARAMS ((cpp_hashnode *));
 408 extern int _cpp_create_definition       PARAMS ((cpp_reader *, cpp_hashnode *));
 409 extern void _cpp_pop_context            PARAMS ((cpp_reader *));
 410
 411 /* In cpphash.c */
 412 extern void _cpp_init_hashtable         PARAMS ((cpp_reader *, hash_table *));
 413 extern void _cpp_destroy_hashtable      PARAMS ((cpp_reader *));
 414
 415 /* In cppfiles.c */
 416 extern void _cpp_fake_include           PARAMS ((cpp_reader *, const char *));
 417 extern void _cpp_never_reread           PARAMS ((struct include_file *));
 418 extern char *_cpp_simplify_pathname     PARAMS ((char *));
 419 extern bool _cpp_read_file              PARAMS ((cpp_reader *, const char *));
 420 extern bool _cpp_execute_include        PARAMS ((cpp_reader *,
 421                                                  const cpp_token *,
 422                                                  enum include_type));
 423 extern int _cpp_compare_file_date       PARAMS ((cpp_reader *,
 424                                                  const cpp_token *));
 425 extern void _cpp_report_missing_guards  PARAMS ((cpp_reader *));
 426 extern void _cpp_init_includes          PARAMS ((cpp_reader *));
 427 extern void _cpp_cleanup_includes       PARAMS ((cpp_reader *));
 428 extern void _cpp_pop_file_buffer        PARAMS ((cpp_reader *,
 429                                                  struct include_file *));
 430
 431 /* In cppexp.c */
 432 extern bool _cpp_parse_expr             PARAMS ((cpp_reader *));
 433 extern struct op *_cpp_expand_op_stack  PARAMS ((cpp_reader *));
 434
 435 /* In cpplex.c */
 436 extern cpp_token *_cpp_temp_token       PARAMS ((cpp_reader *));
 437 extern const cpp_token *_cpp_lex_token  PARAMS ((cpp_reader *));
 438 extern cpp_token *_cpp_lex_direct       PARAMS ((cpp_reader *));
 439 extern int _cpp_equiv_tokens            PARAMS ((const cpp_token *,
 440                                                  const cpp_token *));
 441 extern void _cpp_init_tokenrun          PARAMS ((tokenrun *, unsigned int));
 442
 443 /* In cppinit.c.  */
 444 extern void _cpp_maybe_push_include_file PARAMS ((cpp_reader *));
 445
 446 /* In cpplib.c */
 447 extern int _cpp_test_assertion PARAMS ((cpp_reader *, unsigned int *));
 448 extern int _cpp_handle_directive PARAMS ((cpp_reader *, int));
 449 extern void _cpp_define_builtin PARAMS ((cpp_reader *, const char *));
 450 extern void _cpp_do__Pragma     PARAMS ((cpp_reader *));
 451 extern void _cpp_init_directives PARAMS ((cpp_reader *));
 452 extern void _cpp_init_internal_pragmas PARAMS ((cpp_reader *));
 453 extern void _cpp_do_file_change PARAMS ((cpp_reader *, enum lc_reason,
 454                                          const char *,
 455                                          unsigned int, unsigned int));
 456 extern void _cpp_pop_buffer PARAMS ((cpp_reader *));
 457
 458 /* In cpptrad.c.  */
 459 extern bool _cpp_read_logical_line_trad PARAMS ((cpp_reader *));
 460 extern void _cpp_overlay_buffer PARAMS ((cpp_reader *pfile, const uchar *,
 461                                          size_t));
 462
 463 /* Utility routines and macros.  */
 464 #define DSC(str) (const uchar *)str, sizeof str - 1
 465 #define xnew(T)         (T *) xmalloc (sizeof(T))
 466 #define xcnew(T)        (T *) xcalloc (1, sizeof(T))
 467 #define xnewvec(T, N)   (T *) xmalloc (sizeof(T) * (N))
 468 #define xcnewvec(T, N)  (T *) xcalloc (N, sizeof(T))
 469 #define xobnew(O, T)    (T *) obstack_alloc (O, sizeof(T))
 470
 471 /* These are inline functions instead of macros so we can get type
 472    checking.  */
 473 static inline int ustrcmp       PARAMS ((const uchar *, const uchar *));
 474 static inline int ustrncmp      PARAMS ((const uchar *, const uchar *,
 475                                          size_t));
 476 static inline size_t ustrlen    PARAMS ((const uchar *));
 477 static inline uchar *uxstrdup   PARAMS ((const uchar *));
 478 static inline uchar *ustrchr    PARAMS ((const uchar *, int));
 479 static inline int ufputs        PARAMS ((const uchar *, FILE *));
 480
 481 static inline int
 482 ustrcmp (s1, s2)
 483      const uchar *s1, *s2;
 484 {
 485   return strcmp ((const char *)s1, (const char *)s2);
 486 }
 487
 488 static inline int
 489 ustrncmp (s1, s2, n)
 490      const uchar *s1, *s2;
 491      size_t n;
 492 {
 493   return strncmp ((const char *)s1, (const char *)s2, n);
 494 }
 495
 496 static inline size_t
 497 ustrlen (s1)
 498      const uchar *s1;
 499 {
 500   return strlen ((const char *)s1);
 501 }
 502
 503 static inline uchar *
 504 uxstrdup (s1)
 505      const uchar *s1;
 506 {
 507   return (uchar *) xstrdup ((const char *)s1);
 508 }
 509
 510 static inline uchar *
 511 ustrchr (s1, c)
 512      const uchar *s1;
 513      int c;
 514 {
 515   return (uchar *) strchr ((const char *)s1, c);
 516 }
 517
 518 static inline int
 519 ufputs (s, f)
 520      const uchar *s;
 521      FILE *f;
 522 {
 523   return fputs ((const char *)s, f);
 524 }
 525
 526 #endif /* ! GCC_CPPHASH_H */