gcc/cpphash.h

   1 /* Part of CPP library.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
   3
   4 This program is free software; you can redistribute it and/or modify it
   5 under the terms of the GNU General Public License as published by the
   6 Free Software Foundation; either version 2, or (at your option) any
   7 later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 /* This header defines all the internal data structures and functions
  19    that need to be visible across files.  It's called cpphash.h for
  20    historical reasons.  */
  21
  22 #ifndef GCC_CPPHASH_H
  23 #define GCC_CPPHASH_H
  24
  25 #include "hashtable.h"
  26
  27 struct directive;               /* Deliberately incomplete.  */
  28
  29 /* Test if a sign is valid within a preprocessing number.  */
  30 #define VALID_SIGN(c, prevc) \
  31   (((c) == '+' || (c) == '-') && \
  32    ((prevc) == 'e' || (prevc) == 'E' \
  33     || (((prevc) == 'p' || (prevc) == 'P') \
  34         && CPP_OPTION (pfile, extended_numbers))))
  35
  36 #define CPP_OPTION(PFILE, OPTION) ((PFILE)->opts.OPTION)
  37 #define CPP_BUFFER(PFILE) ((PFILE)->buffer)
  38 #define CPP_BUF_COLUMN(BUF, CUR) ((CUR) - (BUF)->line_base + (BUF)->col_adjust)
  39 #define CPP_BUF_COL(BUF) CPP_BUF_COLUMN(BUF, (BUF)->cur)
  40
  41 /* Maximum nesting of cpp_buffers.  We use a static limit, partly for
  42    efficiency, and partly to limit runaway recursion.  */
  43 #define CPP_STACK_MAX 200
  44
  45 /* A generic memory buffer, and operations on it.  */
  46
  47 typedef struct _cpp_buff _cpp_buff;
  48 struct _cpp_buff
  49 {
  50   struct _cpp_buff *next;
  51   unsigned char *base, *cur, *limit;
  52 };
  53
  54 extern _cpp_buff *_cpp_get_buff PARAMS ((cpp_reader *, size_t));
  55 extern void _cpp_release_buff PARAMS ((cpp_reader *, _cpp_buff *));
  56 extern void _cpp_extend_buff PARAMS ((cpp_reader *, _cpp_buff **, size_t));
  57 extern _cpp_buff *_cpp_append_extend_buff PARAMS ((cpp_reader *, _cpp_buff *,
  58                                                    size_t));
  59 extern void _cpp_free_buff PARAMS ((_cpp_buff *));
  60 extern unsigned char *_cpp_aligned_alloc PARAMS ((cpp_reader *, size_t));
  61 extern unsigned char *_cpp_unaligned_alloc PARAMS ((cpp_reader *, size_t));
  62
  63 #define BUFF_ROOM(BUFF) (size_t) ((BUFF)->limit - (BUFF)->cur)
  64 #define BUFF_FRONT(BUFF) ((BUFF)->cur)
  65 #define BUFF_LIMIT(BUFF) ((BUFF)->limit)
  66
  67 /* List of directories to look for include files in.  */
  68 struct search_path
  69 {
  70   struct search_path *next;
  71
  72   /* NOTE: NAME may not be null terminated for the case of the current
  73      file's directory!  */
  74   const char *name;
  75   unsigned int len;
  76   /* We use these to tell if the directory mentioned here is a duplicate
  77      of an earlier directory on the search path.  */
  78   ino_t ino;
  79   dev_t dev;
  80   /* Non-zero if it is a system include directory.  */
  81   int sysp;
  82   /* Mapping of file names for this directory.  Only used on MS-DOS
  83      and related platforms.  */
  84   struct file_name_map *name_map;
  85 };
  86
  87 /* #include types.  */
  88 enum include_type {IT_INCLUDE, IT_INCLUDE_NEXT, IT_IMPORT, IT_CMDLINE};
  89
  90 union utoken
  91 {
  92   const cpp_token *token;
  93   const cpp_token **ptoken;
  94 };
  95
  96 typedef struct tokenrun tokenrun;
  97 struct tokenrun
  98 {
  99   tokenrun *next, *prev;
 100   cpp_token *base, *limit;
 101 };
 102
 103 typedef struct cpp_context cpp_context;
 104 struct cpp_context
 105 {
 106   /* Doubly-linked list.  */
 107   cpp_context *next, *prev;
 108
 109   /* Contexts other than the base context are contiguous tokens.
 110      e.g. macro expansions, expanded argument tokens.  */
 111   union utoken first;
 112   union utoken last;
 113
 114   /* If non-NULL, a buffer used for storage related to this context.
 115      When the context is popped, the buffer is released.  */
 116   _cpp_buff *buff;
 117
 118   /* For a macro context, the macro node, otherwise NULL.  */
 119   cpp_hashnode *macro;
 120
 121   /* True if utoken element is token, else ptoken.  */
 122   bool direct_p;
 123 };
 124
 125 struct lexer_state
 126 {
 127   /* Nonzero if first token on line is CPP_HASH.  */
 128   unsigned char in_directive;
 129
 130   /* True if we are skipping a failed conditional group.  */
 131   unsigned char skipping;
 132
 133   /* Nonzero if in a directive that takes angle-bracketed headers.  */
 134   unsigned char angled_headers;
 135
 136   /* Nonzero to save comments.  Turned off if discard_comments, and in
 137      all directives apart from #define.  */
 138   unsigned char save_comments;
 139
 140   /* Nonzero if we're mid-comment.  */
 141   unsigned char lexing_comment;
 142
 143   /* Nonzero if lexing __VA_ARGS__ is valid.  */
 144   unsigned char va_args_ok;
 145
 146   /* Nonzero if lexing poisoned identifiers is valid.  */
 147   unsigned char poisoned_ok;
 148
 149   /* Nonzero to prevent macro expansion.  */
 150   unsigned char prevent_expansion;
 151
 152   /* Nonzero when parsing arguments to a function-like macro.  */
 153   unsigned char parsing_args;
 154
 155   /* Nonzero when in a # NUMBER directive.  */
 156   unsigned char line_extension;
 157 };
 158
 159 /* Special nodes - identifiers with predefined significance.  */
 160 struct spec_nodes
 161 {
 162   cpp_hashnode *n_defined;              /* defined operator */
 163   cpp_hashnode *n_true;                 /* C++ keyword true */
 164   cpp_hashnode *n_false;                /* C++ keyword false */
 165   cpp_hashnode *n__STRICT_ANSI__;       /* STDC_0_IN_SYSTEM_HEADERS */
 166   cpp_hashnode *n__CHAR_UNSIGNED__;     /* plain char is unsigned */
 167   cpp_hashnode *n__VA_ARGS__;           /* C99 vararg macros */
 168 };
 169
 170 struct cpp_buffer
 171 {
 172   const unsigned char *cur;      /* current position */
 173   const unsigned char *backup_to; /* if peeked character is not wanted */
 174   const unsigned char *rlimit; /* end of valid data */
 175   const unsigned char *line_base; /* start of current line */
 176
 177   struct cpp_buffer *prev;
 178
 179   const unsigned char *buf;      /* Entire character buffer.  */
 180
 181   /* Pointer into the include table; non-NULL if this is a file
 182      buffer.  Used for include_next and to record control macros.  */
 183   struct include_file *inc;
 184
 185   /* Value of if_stack at start of this file.
 186      Used to prohibit unmatched #endif (etc) in an include file.  */
 187   struct if_stack *if_stack;
 188
 189   /* Token column position adjustment owing to tabs in whitespace.  */
 190   unsigned int col_adjust;
 191
 192   /* Contains PREV_WHITE and/or AVOID_LPASTE.  */
 193   unsigned char saved_flags;
 194
 195   /* Because of the way the lexer works, -Wtrigraphs can sometimes
 196      warn twice for the same trigraph.  This helps prevent that.  */
 197   const unsigned char *last_Wtrigraphs;
 198
 199   /* True if we have already warned about C++ comments in this file.
 200      The warning happens only for C89 extended mode with -pedantic on,
 201      or for -Wtraditional, and only once per file (otherwise it would
 202      be far too noisy).  */
 203   unsigned char warned_cplusplus_comments;
 204
 205   /* True if we don't process trigraphs and escaped newlines.  True
 206      for preprocessed input, command line directives, and _Pragma
 207      buffers.  */
 208   unsigned char from_stage3;
 209
 210   /* Nonzero means that the directory to start searching for ""
 211      include files has been calculated and stored in "dir" below.  */
 212   unsigned char search_cached;
 213
 214   /* At EOF, a buffer is automatically popped.  If RETURN_AT_EOF is
 215      true, a CPP_EOF token is then returned.  Otherwise, the next
 216      token from the enclosing buffer is returned.  */
 217   bool return_at_eof;
 218
 219   /* The directory of the this buffer's file.  Its NAME member is not
 220      allocated, so we don't need to worry about freeing it.  */
 221   struct search_path dir;
 222 };
 223
 224 /* A cpp_reader encapsulates the "state" of a pre-processor run.
 225    Applying cpp_get_token repeatedly yields a stream of pre-processor
 226    tokens.  Usually, there is only one cpp_reader object active.  */
 227
 228 struct cpp_reader
 229 {
 230   /* Top of buffer stack.  */
 231   cpp_buffer *buffer;
 232
 233   /* Lexer state.  */
 234   struct lexer_state state;
 235
 236   /* Source line tracking.  */
 237   struct line_maps line_maps;
 238   const struct line_map *map;
 239   unsigned int line;
 240
 241   /* The line of the '#' of the current directive.  */
 242   unsigned int directive_line;
 243
 244   /* Memory buffers.  */
 245   _cpp_buff *a_buff;            /* Aligned permanent storage.  */
 246   _cpp_buff *u_buff;            /* Unaligned permanent storage.  */
 247   _cpp_buff *free_buffs;        /* Free buffer chain.  */
 248
 249   /* Context stack.  */
 250   struct cpp_context base_context;
 251   struct cpp_context *context;
 252
 253   /* If in_directive, the directive if known.  */
 254   const struct directive *directive;
 255
 256   /* Multiple inlcude optimisation.  */
 257   const cpp_hashnode *mi_cmacro;
 258   const cpp_hashnode *mi_ind_cmacro;
 259   bool mi_valid;
 260
 261   /* Lexing.  */
 262   cpp_token *cur_token;
 263   tokenrun base_run, *cur_run;
 264   unsigned int lookaheads;
 265
 266   /* Non-zero prevents the lexer from re-using the token runs.  */
 267   unsigned int keep_tokens;
 268
 269   /* Error counter for exit code.  */
 270   unsigned int errors;
 271
 272   /* Line and column where a newline was first seen in a string
 273      constant (multi-line strings).  */
 274   unsigned int mls_line;
 275   unsigned int mls_col;
 276
 277   /* Buffer to hold macro definition string.  */
 278   unsigned char *macro_buffer;
 279   unsigned int macro_buffer_len;
 280
 281   /* Tree of other included files.  See cppfiles.c.  */
 282   struct splay_tree_s *all_include_files;
 283
 284   /* Current maximum length of directory names in the search path
 285      for include files.  (Altered as we get more of them.)  */
 286   unsigned int max_include_len;
 287
 288   /* Date and time tokens.  Calculated together if either is requested.  */
 289   cpp_token date;
 290   cpp_token time;
 291
 292   /* EOF token, and a token forcing paste avoidance.  */
 293   cpp_token avoid_paste;
 294   cpp_token eof;
 295
 296   /* Opaque handle to the dependencies of mkdeps.c.  Used by -M etc.  */
 297   struct deps *deps;
 298
 299   /* Obstack holding all macro hash nodes.  This never shrinks.
 300      See cpphash.c */
 301   struct obstack hash_ob;
 302
 303   /* Obstack holding buffer and conditional structures.  This is a
 304      real stack.  See cpplib.c.  */
 305   struct obstack buffer_ob;
 306
 307   /* Pragma table - dynamic, because a library user can add to the
 308      list of recognized pragmas.  */
 309   struct pragma_entry *pragmas;
 310
 311   /* Call backs.  */
 312   struct cpp_callbacks cb;
 313
 314   /* Identifier hash table.  */
 315   struct ht *hash_table;
 316
 317   /* User visible options.  */
 318   struct cpp_options opts;
 319
 320   /* Special nodes - identifiers with predefined significance to the
 321      preprocessor.  */
 322   struct spec_nodes spec_nodes;
 323
 324   /* Whether to print our version number.  Done this way so
 325      we don't get it twice for -v -version.  */
 326   unsigned char print_version;
 327
 328   /* Whether cpplib owns the hashtable.  */
 329   unsigned char our_hashtable;
 330 };
 331
 332 /* Character classes.  Based on the more primitive macros in safe-ctype.h.
 333    If the definition of `numchar' looks odd to you, please look up the
 334    definition of a pp-number in the C standard [section 6.4.8 of C99].
 335
 336    In the unlikely event that characters other than \r and \n enter
 337    the set is_vspace, the macro handle_newline() in cpplex.c must be
 338    updated.  */
 339 #define _dollar_ok(x)   ((x) == '$' && CPP_OPTION (pfile, dollars_in_ident))
 340
 341 #define is_idchar(x)    (ISIDNUM(x) || _dollar_ok(x))
 342 #define is_numchar(x)   ISIDNUM(x)
 343 #define is_idstart(x)   (ISIDST(x) || _dollar_ok(x))
 344 #define is_numstart(x)  ISDIGIT(x)
 345 #define is_hspace(x)    ISBLANK(x)
 346 #define is_vspace(x)    IS_VSPACE(x)
 347 #define is_nvspace(x)   IS_NVSPACE(x)
 348 #define is_space(x)     IS_SPACE_OR_NUL(x)
 349
 350 /* This table is constant if it can be initialized at compile time,
 351    which is the case if cpp was compiled with GCC >=2.7, or another
 352    compiler that supports C99.  */
 353 #if HAVE_DESIGNATED_INITIALIZERS
 354 extern const unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];
 355 #else
 356 extern unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];
 357 #endif
 358
 359 /* Macros.  */
 360
 361 #define CPP_PRINT_DEPS(PFILE) CPP_OPTION (PFILE, print_deps)
 362 #define CPP_IN_SYSTEM_HEADER(PFILE) ((PFILE)->map && (PFILE)->map->sysp)
 363 #define CPP_PEDANTIC(PF) CPP_OPTION (PF, pedantic)
 364 #define CPP_WTRADITIONAL(PF) CPP_OPTION (PF, warn_traditional)
 365
 366 /* In cpperror.c  */
 367 enum error_type { WARNING = 0, WARNING_SYSHDR, PEDWARN, ERROR, FATAL, ICE };
 368 extern int _cpp_begin_message PARAMS ((cpp_reader *, enum error_type,
 369                                        unsigned int, unsigned int));
 370
 371 /* In cppmacro.c */
 372 extern void _cpp_free_definition        PARAMS ((cpp_hashnode *));
 373 extern int _cpp_create_definition       PARAMS ((cpp_reader *, cpp_hashnode *));
 374 extern void _cpp_pop_context            PARAMS ((cpp_reader *));
 375
 376 /* In cpphash.c */
 377 extern void _cpp_init_hashtable         PARAMS ((cpp_reader *, hash_table *));
 378 extern void _cpp_destroy_hashtable      PARAMS ((cpp_reader *));
 379
 380 /* In cppfiles.c */
 381 extern void _cpp_fake_include           PARAMS ((cpp_reader *, const char *));
 382 extern void _cpp_never_reread           PARAMS ((struct include_file *));
 383 extern char *_cpp_simplify_pathname     PARAMS ((char *));
 384 extern bool _cpp_read_file              PARAMS ((cpp_reader *, const char *));
 385 extern bool _cpp_execute_include        PARAMS ((cpp_reader *,
 386                                                  const cpp_token *,
 387                                                  enum include_type));
 388 extern int _cpp_compare_file_date       PARAMS ((cpp_reader *,
 389                                                  const cpp_token *));
 390 extern void _cpp_report_missing_guards  PARAMS ((cpp_reader *));
 391 extern void _cpp_init_includes          PARAMS ((cpp_reader *));
 392 extern void _cpp_cleanup_includes       PARAMS ((cpp_reader *));
 393 extern void _cpp_pop_file_buffer        PARAMS ((cpp_reader *,
 394                                                  struct include_file *));
 395
 396 /* In cppexp.c */
 397 extern int _cpp_parse_expr              PARAMS ((cpp_reader *));
 398
 399 /* In cpplex.c */
 400 extern cpp_token *_cpp_temp_token       PARAMS ((cpp_reader *));
 401 extern const cpp_token *_cpp_lex_token  PARAMS ((cpp_reader *));
 402 extern cpp_token *_cpp_lex_direct       PARAMS ((cpp_reader *));
 403 extern int _cpp_equiv_tokens            PARAMS ((const cpp_token *,
 404                                                  const cpp_token *));
 405 extern void _cpp_init_tokenrun          PARAMS ((tokenrun *, unsigned int));
 406
 407 /* In cppinit.c.  */
 408 extern bool _cpp_push_next_buffer       PARAMS ((cpp_reader *));
 409
 410 /* In cpplib.c */
 411 extern int _cpp_test_assertion PARAMS ((cpp_reader *, int *));
 412 extern int _cpp_handle_directive PARAMS ((cpp_reader *, int));
 413 extern void _cpp_define_builtin PARAMS ((cpp_reader *, const char *));
 414 extern void _cpp_do__Pragma     PARAMS ((cpp_reader *));
 415 extern void _cpp_init_directives PARAMS ((cpp_reader *));
 416 extern void _cpp_init_internal_pragmas PARAMS ((cpp_reader *));
 417 extern void _cpp_do_file_change PARAMS ((cpp_reader *, enum lc_reason,
 418                                          const char *,
 419                                          unsigned int, unsigned int));
 420 extern void _cpp_pop_buffer PARAMS ((cpp_reader *));
 421
 422 /* Utility routines and macros.  */
 423 #define DSC(str) (const U_CHAR *)str, sizeof str - 1
 424 #define xnew(T)         (T *) xmalloc (sizeof(T))
 425 #define xcnew(T)        (T *) xcalloc (1, sizeof(T))
 426 #define xnewvec(T, N)   (T *) xmalloc (sizeof(T) * (N))
 427 #define xcnewvec(T, N)  (T *) xcalloc (N, sizeof(T))
 428 #define xobnew(O, T)    (T *) obstack_alloc (O, sizeof(T))
 429
 430 /* These are inline functions instead of macros so we can get type
 431    checking.  */
 432 typedef unsigned char U_CHAR;
 433 #define U (const U_CHAR *)  /* Intended use: U"string" */
 434
 435 static inline int ustrcmp       PARAMS ((const U_CHAR *, const U_CHAR *));
 436 static inline int ustrncmp      PARAMS ((const U_CHAR *, const U_CHAR *,
 437                                          size_t));
 438 static inline size_t ustrlen    PARAMS ((const U_CHAR *));
 439 static inline U_CHAR *uxstrdup  PARAMS ((const U_CHAR *));
 440 static inline U_CHAR *ustrchr   PARAMS ((const U_CHAR *, int));
 441 static inline int ufputs        PARAMS ((const U_CHAR *, FILE *));
 442
 443 static inline int
 444 ustrcmp (s1, s2)
 445      const U_CHAR *s1, *s2;
 446 {
 447   return strcmp ((const char *)s1, (const char *)s2);
 448 }
 449
 450 static inline int
 451 ustrncmp (s1, s2, n)
 452      const U_CHAR *s1, *s2;
 453      size_t n;
 454 {
 455   return strncmp ((const char *)s1, (const char *)s2, n);
 456 }
 457
 458 static inline size_t
 459 ustrlen (s1)
 460      const U_CHAR *s1;
 461 {
 462   return strlen ((const char *)s1);
 463 }
 464
 465 static inline U_CHAR *
 466 uxstrdup (s1)
 467      const U_CHAR *s1;
 468 {
 469   return (U_CHAR *) xstrdup ((const char *)s1);
 470 }
 471
 472 static inline U_CHAR *
 473 ustrchr (s1, c)
 474      const U_CHAR *s1;
 475      int c;
 476 {
 477   return (U_CHAR *) strchr ((const char *)s1, c);
 478 }
 479
 480 static inline int
 481 ufputs (s, f)
 482      const U_CHAR *s;
 483      FILE *f;
 484 {
 485   return fputs ((const char *)s, f);
 486 }
 487
 488 #endif /* ! GCC_CPPHASH_H */