libcpp/internal.h

   1 /* Part of CPP library.
   2    Copyright (C) 1997-2016 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 3, 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; see the file COPYING3.  If not see
  16 <http://www.gnu.org/licenses/>.  */
  17
  18 /* This header defines all the internal data structures and functions
  19    that need to be visible across files.  It should not be used outside
  20    cpplib.  */
  21
  22 #ifndef LIBCPP_INTERNAL_H
  23 #define LIBCPP_INTERNAL_H
  24
  25 #include "symtab.h"
  26 #include "cpp-id-data.h"
  27
  28 #if HAVE_ICONV
  29 #include <iconv.h>
  30 #else
  31 #define HAVE_ICONV 0
  32 typedef int iconv_t;  /* dummy */
  33 #endif
  34
  35 #ifdef __cplusplus
  36 extern "C" {
  37 #endif
  38
  39 struct directive;               /* Deliberately incomplete.  */
  40 struct pending_option;
  41 struct op;
  42 struct _cpp_strbuf;
  43
  44 typedef bool (*convert_f) (iconv_t, const unsigned char *, size_t,
  45                            struct _cpp_strbuf *);
  46 struct cset_converter
  47 {
  48   convert_f func;
  49   iconv_t cd;
  50   int width;
  51 };
  52
  53 #define BITS_PER_CPPCHAR_T (CHAR_BIT * sizeof (cppchar_t))
  54
  55 /* Test if a sign is valid within a preprocessing number.  */
  56 #define VALID_SIGN(c, prevc) \
  57   (((c) == '+' || (c) == '-') && \
  58    ((prevc) == 'e' || (prevc) == 'E' \
  59     || (((prevc) == 'p' || (prevc) == 'P') \
  60         && CPP_OPTION (pfile, extended_numbers))))
  61
  62 #define DIGIT_SEP(c) ((c) == '\'' && CPP_OPTION (pfile, digit_separators))
  63
  64 #define CPP_OPTION(PFILE, OPTION) ((PFILE)->opts.OPTION)
  65 #define CPP_BUFFER(PFILE) ((PFILE)->buffer)
  66 #define CPP_BUF_COLUMN(BUF, CUR) ((CUR) - (BUF)->line_base)
  67 #define CPP_BUF_COL(BUF) CPP_BUF_COLUMN(BUF, (BUF)->cur)
  68
  69 #define CPP_INCREMENT_LINE(PFILE, COLS_HINT) do { \
  70     const struct line_maps *line_table = PFILE->line_table; \
  71     const struct line_map_ordinary *map = \
  72       LINEMAPS_LAST_ORDINARY_MAP (line_table); \
  73     linenum_type line = SOURCE_LINE (map, line_table->highest_line); \
  74     linemap_line_start (PFILE->line_table, line + 1, COLS_HINT); \
  75   } while (0)
  76
  77 /* Maximum nesting of cpp_buffers.  We use a static limit, partly for
  78    efficiency, and partly to limit runaway recursion.  */
  79 #define CPP_STACK_MAX 200
  80
  81 /* Host alignment handling.  */
  82 struct dummy
  83 {
  84   char c;
  85   union
  86   {
  87     double d;
  88     int *p;
  89   } u;
  90 };
  91
  92 #define DEFAULT_ALIGNMENT offsetof (struct dummy, u)
  93 #define CPP_ALIGN2(size, align) (((size) + ((align) - 1)) & ~((align) - 1))
  94 #define CPP_ALIGN(size) CPP_ALIGN2 (size, DEFAULT_ALIGNMENT)
  95
  96 #define _cpp_mark_macro_used(NODE) do {                                 \
  97   if ((NODE)->type == NT_MACRO && !((NODE)->flags & NODE_BUILTIN))      \
  98     (NODE)->value.macro->used = 1; } while (0)
  99
 100 /* A generic memory buffer, and operations on it.  */
 101 typedef struct _cpp_buff _cpp_buff;
 102 struct _cpp_buff
 103 {
 104   struct _cpp_buff *next;
 105   unsigned char *base, *cur, *limit;
 106 };
 107
 108 extern _cpp_buff *_cpp_get_buff (cpp_reader *, size_t);
 109 extern void _cpp_release_buff (cpp_reader *, _cpp_buff *);
 110 extern void _cpp_extend_buff (cpp_reader *, _cpp_buff **, size_t);
 111 extern _cpp_buff *_cpp_append_extend_buff (cpp_reader *, _cpp_buff *, size_t);
 112 extern void _cpp_free_buff (_cpp_buff *);
 113 extern unsigned char *_cpp_aligned_alloc (cpp_reader *, size_t);
 114 extern unsigned char *_cpp_unaligned_alloc (cpp_reader *, size_t);
 115
 116 #define BUFF_ROOM(BUFF) (size_t) ((BUFF)->limit - (BUFF)->cur)
 117 #define BUFF_FRONT(BUFF) ((BUFF)->cur)
 118 #define BUFF_LIMIT(BUFF) ((BUFF)->limit)
 119
 120 /* #include types.  */
 121 enum include_type {IT_INCLUDE, IT_INCLUDE_NEXT, IT_IMPORT, IT_CMDLINE, IT_DEFAULT};
 122
 123 union utoken
 124 {
 125   const cpp_token *token;
 126   const cpp_token **ptoken;
 127 };
 128
 129 /* A "run" of tokens; part of a chain of runs.  */
 130 typedef struct tokenrun tokenrun;
 131 struct tokenrun
 132 {
 133   tokenrun *next, *prev;
 134   cpp_token *base, *limit;
 135 };
 136
 137 /* Accessor macros for struct cpp_context.  */
 138 #define FIRST(c) ((c)->u.iso.first)
 139 #define LAST(c) ((c)->u.iso.last)
 140 #define CUR(c) ((c)->u.trad.cur)
 141 #define RLIMIT(c) ((c)->u.trad.rlimit)
 142
 143 /* This describes some additional data that is added to the macro
 144    token context of type cpp_context, when -ftrack-macro-expansion is
 145    on.  */
 146 typedef struct
 147 {
 148   /* The node of the macro we are referring to.  */
 149   cpp_hashnode *macro_node;
 150   /* This buffer contains an array of virtual locations.  The virtual
 151      location at index 0 is the virtual location of the token at index
 152      0 in the current instance of cpp_context; similarly for all the
 153      other virtual locations.  */
 154   source_location *virt_locs;
 155   /* This is a pointer to the current virtual location.  This is used
 156      to iterate over the virtual locations while we iterate over the
 157      tokens they belong to.  */
 158   source_location *cur_virt_loc;
 159 } macro_context;
 160
 161 /* The kind of tokens carried by a cpp_context.  */
 162 enum context_tokens_kind {
 163   /* This is the value of cpp_context::tokens_kind if u.iso.first
 164      contains an instance of cpp_token **.  */
 165   TOKENS_KIND_INDIRECT,
 166   /* This is the value of cpp_context::tokens_kind if u.iso.first
 167      contains an instance of cpp_token *.  */
 168   TOKENS_KIND_DIRECT,
 169   /* This is the value of cpp_context::tokens_kind when the token
 170      context contains tokens resulting from macro expansion.  In that
 171      case struct cpp_context::macro points to an instance of struct
 172      macro_context.  This is used only when the
 173      -ftrack-macro-expansion flag is on.  */
 174   TOKENS_KIND_EXTENDED
 175 };
 176
 177 typedef struct cpp_context cpp_context;
 178 struct cpp_context
 179 {
 180   /* Doubly-linked list.  */
 181   cpp_context *next, *prev;
 182
 183   union
 184   {
 185     /* For ISO macro expansion.  Contexts other than the base context
 186        are contiguous tokens.  e.g. macro expansions, expanded
 187        argument tokens.  */
 188     struct
 189     {
 190       union utoken first;
 191       union utoken last;
 192     } iso;
 193
 194     /* For traditional macro expansion.  */
 195     struct
 196     {
 197       const unsigned char *cur;
 198       const unsigned char *rlimit;
 199     } trad;
 200   } u;
 201
 202   /* If non-NULL, a buffer used for storage related to this context.
 203      When the context is popped, the buffer is released.  */
 204   _cpp_buff *buff;
 205
 206   /* If tokens_kind is TOKEN_KIND_EXTENDED, then (as we thus are in a
 207      macro context) this is a pointer to an instance of macro_context.
 208      Otherwise if tokens_kind is *not* TOKEN_KIND_EXTENDED, then, if
 209      we are in a macro context, this is a pointer to an instance of
 210      cpp_hashnode, representing the name of the macro this context is
 211      for.  If we are not in a macro context, then this is just NULL.
 212      Note that when tokens_kind is TOKEN_KIND_EXTENDED, the memory
 213      used by the instance of macro_context pointed to by this member
 214      is de-allocated upon de-allocation of the instance of struct
 215      cpp_context.  */
 216   union
 217   {
 218     macro_context *mc;
 219     cpp_hashnode *macro;
 220   } c;
 221
 222   /* This determines the type of tokens held by this context.  */
 223   enum context_tokens_kind tokens_kind;
 224 };
 225
 226 struct lexer_state
 227 {
 228   /* Nonzero if first token on line is CPP_HASH.  */
 229   unsigned char in_directive;
 230
 231   /* Nonzero if in a directive that will handle padding tokens itself.
 232      #include needs this to avoid problems with computed include and
 233      spacing between tokens.  */
 234   unsigned char directive_wants_padding;
 235
 236   /* True if we are skipping a failed conditional group.  */
 237   unsigned char skipping;
 238
 239   /* Nonzero if in a directive that takes angle-bracketed headers.  */
 240   unsigned char angled_headers;
 241
 242   /* Nonzero if in a #if or #elif directive.  */
 243   unsigned char in_expression;
 244
 245   /* Nonzero to save comments.  Turned off if discard_comments, and in
 246      all directives apart from #define.  */
 247   unsigned char save_comments;
 248
 249   /* Nonzero if lexing __VA_ARGS__ is valid.  */
 250   unsigned char va_args_ok;
 251
 252   /* Nonzero if lexing poisoned identifiers is valid.  */
 253   unsigned char poisoned_ok;
 254
 255   /* Nonzero to prevent macro expansion.  */
 256   unsigned char prevent_expansion;
 257
 258   /* Nonzero when parsing arguments to a function-like macro.  */
 259   unsigned char parsing_args;
 260
 261   /* Nonzero if in a __has_include__ or __has_include_next__ statement.  */
 262   unsigned char in__has_include__;
 263
 264   /* Nonzero if prevent_expansion is true only because output is
 265      being discarded.  */
 266   unsigned char discarding_output;
 267
 268   /* Nonzero to skip evaluating part of an expression.  */
 269   unsigned int skip_eval;
 270
 271   /* Nonzero when handling a deferred pragma.  */
 272   unsigned char in_deferred_pragma;
 273
 274   /* Nonzero if the deferred pragma being handled allows macro expansion.  */
 275   unsigned char pragma_allow_expansion;
 276 };
 277
 278 /* Special nodes - identifiers with predefined significance.  */
 279 struct spec_nodes
 280 {
 281   cpp_hashnode *n_defined;              /* defined operator */
 282   cpp_hashnode *n_true;                 /* C++ keyword true */
 283   cpp_hashnode *n_false;                /* C++ keyword false */
 284   cpp_hashnode *n__VA_ARGS__;           /* C99 vararg macros */
 285   cpp_hashnode *n__has_include__;       /* __has_include__ operator */
 286   cpp_hashnode *n__has_include_next__;  /* __has_include_next__ operator */
 287 };
 288
 289 typedef struct _cpp_line_note _cpp_line_note;
 290 struct _cpp_line_note
 291 {
 292   /* Location in the clean line the note refers to.  */
 293   const unsigned char *pos;
 294
 295   /* Type of note.  The 9 'from' trigraph characters represent those
 296      trigraphs, '\\' an escaped newline, ' ' an escaped newline with
 297      intervening space, 0 represents a note that has already been handled,
 298      and anything else is invalid.  */
 299   unsigned int type;
 300 };
 301
 302 /* Represents the contents of a file cpplib has read in.  */
 303 struct cpp_buffer
 304 {
 305   const unsigned char *cur;        /* Current location.  */
 306   const unsigned char *line_base;  /* Start of current physical line.  */
 307   const unsigned char *next_line;  /* Start of to-be-cleaned logical line.  */
 308
 309   const unsigned char *buf;        /* Entire character buffer.  */
 310   const unsigned char *rlimit;     /* Writable byte at end of file.  */
 311   const unsigned char *to_free;    /* Pointer that should be freed when
 312                                       popping the buffer.  */
 313
 314   _cpp_line_note *notes;           /* Array of notes.  */
 315   unsigned int cur_note;           /* Next note to process.  */
 316   unsigned int notes_used;         /* Number of notes.  */
 317   unsigned int notes_cap;          /* Size of allocated array.  */
 318
 319   struct cpp_buffer *prev;
 320
 321   /* Pointer into the file table; non-NULL if this is a file buffer.
 322      Used for include_next and to record control macros.  */
 323   struct _cpp_file *file;
 324
 325   /* Saved value of __TIMESTAMP__ macro - date and time of last modification
 326      of the assotiated file.  */
 327   const unsigned char *timestamp;
 328
 329   /* Value of if_stack at start of this file.
 330      Used to prohibit unmatched #endif (etc) in an include file.  */
 331   struct if_stack *if_stack;
 332
 333   /* True if we need to get the next clean line.  */
 334   bool need_line;
 335
 336   /* True if we have already warned about C++ comments in this file.
 337      The warning happens only for C89 extended mode with -pedantic on,
 338      or for -Wtraditional, and only once per file (otherwise it would
 339      be far too noisy).  */
 340   unsigned int warned_cplusplus_comments : 1;
 341
 342   /* True if we don't process trigraphs and escaped newlines.  True
 343      for preprocessed input, command line directives, and _Pragma
 344      buffers.  */
 345   unsigned int from_stage3 : 1;
 346
 347   /* At EOF, a buffer is automatically popped.  If RETURN_AT_EOF is
 348      true, a CPP_EOF token is then returned.  Otherwise, the next
 349      token from the enclosing buffer is returned.  */
 350   unsigned int return_at_eof : 1;
 351
 352   /* One for a system header, two for a C system header file that therefore
 353      needs to be extern "C" protected in C++, and zero otherwise.  */
 354   unsigned char sysp;
 355
 356   /* The directory of the this buffer's file.  Its NAME member is not
 357      allocated, so we don't need to worry about freeing it.  */
 358   struct cpp_dir dir;
 359
 360   /* Descriptor for converting from the input character set to the
 361      source character set.  */
 362   struct cset_converter input_cset_desc;
 363 };
 364
 365 /* The list of saved macros by push_macro pragma.  */
 366 struct def_pragma_macro {
 367   /* Chain element to previous saved macro.  */
 368   struct def_pragma_macro *next;
 369   /* Name of the macro.  */
 370   char *name;
 371   /* The stored macro content.  */
 372   unsigned char *definition;
 373
 374   /* Definition line number.  */
 375   source_location line;
 376   /* If macro defined in system header.  */
 377   unsigned int syshdr   : 1;
 378   /* Nonzero if it has been expanded or had its existence tested.  */
 379   unsigned int used     : 1;
 380
 381   /* Mark if we save an undefined macro.  */
 382   unsigned int is_undef : 1;
 383 };
 384
 385 /* A cpp_reader encapsulates the "state" of a pre-processor run.
 386    Applying cpp_get_token repeatedly yields a stream of pre-processor
 387    tokens.  Usually, there is only one cpp_reader object active.  */
 388 struct cpp_reader
 389 {
 390   /* Top of buffer stack.  */
 391   cpp_buffer *buffer;
 392
 393   /* Overlaid buffer (can be different after processing #include).  */
 394   cpp_buffer *overlaid_buffer;
 395
 396   /* Lexer state.  */
 397   struct lexer_state state;
 398
 399   /* Source line tracking.  */
 400   struct line_maps *line_table;
 401
 402   /* The line of the '#' of the current directive.  */
 403   source_location directive_line;
 404
 405   /* Memory buffers.  */
 406   _cpp_buff *a_buff;            /* Aligned permanent storage.  */
 407   _cpp_buff *u_buff;            /* Unaligned permanent storage.  */
 408   _cpp_buff *free_buffs;        /* Free buffer chain.  */
 409
 410   /* Context stack.  */
 411   struct cpp_context base_context;
 412   struct cpp_context *context;
 413
 414   /* If in_directive, the directive if known.  */
 415   const struct directive *directive;
 416
 417   /* Token generated while handling a directive, if any. */
 418   cpp_token directive_result;
 419
 420   /* When expanding a macro at top-level, this is the location of the
 421      macro invocation.  */
 422   source_location invocation_location;
 423
 424   /* This is the node representing the macro being expanded at
 425      top-level.  The value of this data member is valid iff
 426      in_macro_expansion_p() returns TRUE.  */
 427   cpp_hashnode *top_most_macro_node;
 428
 429   /* Nonzero if we are about to expand a macro.  Note that if we are
 430      really expanding a macro, the function macro_of_context returns
 431      the macro being expanded and this flag is set to false.  Client
 432      code should use the function in_macro_expansion_p to know if we
 433      are either about to expand a macro, or are actually expanding
 434      one.  */
 435   bool about_to_expand_macro_p;
 436
 437   /* Search paths for include files.  */
 438   struct cpp_dir *quote_include;        /* "" */
 439   struct cpp_dir *bracket_include;      /* <> */
 440   struct cpp_dir no_search_path;        /* No path.  */
 441
 442   /* Chain of all hashed _cpp_file instances.  */
 443   struct _cpp_file *all_files;
 444
 445   struct _cpp_file *main_file;
 446
 447   /* File and directory hash table.  */
 448   struct htab *file_hash;
 449   struct htab *dir_hash;
 450   struct file_hash_entry_pool *file_hash_entries;
 451
 452   /* Negative path lookup hash table.  */
 453   struct htab *nonexistent_file_hash;
 454   struct obstack nonexistent_file_ob;
 455
 456   /* Nonzero means don't look for #include "foo" the source-file
 457      directory.  */
 458   bool quote_ignores_source_dir;
 459
 460   /* Nonzero if any file has contained #pragma once or #import has
 461      been used.  */
 462   bool seen_once_only;
 463
 464   /* Multiple include optimization.  */
 465   const cpp_hashnode *mi_cmacro;
 466   const cpp_hashnode *mi_ind_cmacro;
 467   bool mi_valid;
 468
 469   /* Lexing.  */
 470   cpp_token *cur_token;
 471   tokenrun base_run, *cur_run;
 472   unsigned int lookaheads;
 473
 474   /* Nonzero prevents the lexer from re-using the token runs.  */
 475   unsigned int keep_tokens;
 476
 477   /* Buffer to hold macro definition string.  */
 478   unsigned char *macro_buffer;
 479   unsigned int macro_buffer_len;
 480
 481   /* Descriptor for converting from the source character set to the
 482      execution character set.  */
 483   struct cset_converter narrow_cset_desc;
 484
 485   /* Descriptor for converting from the source character set to the
 486      UTF-8 execution character set.  */
 487   struct cset_converter utf8_cset_desc;
 488
 489   /* Descriptor for converting from the source character set to the
 490      UTF-16 execution character set.  */
 491   struct cset_converter char16_cset_desc;
 492
 493   /* Descriptor for converting from the source character set to the
 494      UTF-32 execution character set.  */
 495   struct cset_converter char32_cset_desc;
 496
 497   /* Descriptor for converting from the source character set to the
 498      wide execution character set.  */
 499   struct cset_converter wide_cset_desc;
 500
 501   /* Date and time text.  Calculated together if either is requested.  */
 502   const unsigned char *date;
 503   const unsigned char *time;
 504
 505   /* EOF token, and a token forcing paste avoidance.  */
 506   cpp_token avoid_paste;
 507   cpp_token eof;
 508
 509   /* Opaque handle to the dependencies of mkdeps.c.  */
 510   struct deps *deps;
 511
 512   /* Obstack holding all macro hash nodes.  This never shrinks.
 513      See identifiers.c */
 514   struct obstack hash_ob;
 515
 516   /* Obstack holding buffer and conditional structures.  This is a
 517      real stack.  See directives.c.  */
 518   struct obstack buffer_ob;
 519
 520   /* Pragma table - dynamic, because a library user can add to the
 521      list of recognized pragmas.  */
 522   struct pragma_entry *pragmas;
 523
 524   /* Call backs to cpplib client.  */
 525   struct cpp_callbacks cb;
 526
 527   /* Identifier hash table.  */
 528   struct ht *hash_table;
 529
 530   /* Expression parser stack.  */
 531   struct op *op_stack, *op_limit;
 532
 533   /* User visible options.  */
 534   struct cpp_options opts;
 535
 536   /* Special nodes - identifiers with predefined significance to the
 537      preprocessor.  */
 538   struct spec_nodes spec_nodes;
 539
 540   /* Whether cpplib owns the hashtable.  */
 541   bool our_hashtable;
 542
 543   /* Traditional preprocessing output buffer (a logical line).  */
 544   struct
 545   {
 546     unsigned char *base;
 547     unsigned char *limit;
 548     unsigned char *cur;
 549     source_location first_line;
 550   } out;
 551
 552   /* Used for buffer overlays by traditional.c.  */
 553   const unsigned char *saved_cur, *saved_rlimit, *saved_line_base;
 554
 555   /* A saved list of the defined macros, for dependency checking
 556      of precompiled headers.  */
 557   struct cpp_savedstate *savedstate;
 558
 559   /* Next value of __COUNTER__ macro. */
 560   unsigned int counter;
 561
 562   /* Table of comments, when state.save_comments is true.  */
 563   cpp_comment_table comments;
 564
 565   /* List of saved macros by push_macro.  */
 566   struct def_pragma_macro *pushed_macros;
 567
 568   /* If non-null, the lexer will use this location for the next token
 569      instead of getting a location from the linemap.  */
 570   source_location *forced_token_location_p;
 571 };
 572
 573 /* Character classes.  Based on the more primitive macros in safe-ctype.h.
 574    If the definition of `numchar' looks odd to you, please look up the
 575    definition of a pp-number in the C standard [section 6.4.8 of C99].
 576
 577    In the unlikely event that characters other than \r and \n enter
 578    the set is_vspace, the macro handle_newline() in lex.c must be
 579    updated.  */
 580 #define _dollar_ok(x)   ((x) == '$' && CPP_OPTION (pfile, dollars_in_ident))
 581
 582 #define is_idchar(x)    (ISIDNUM(x) || _dollar_ok(x))
 583 #define is_numchar(x)   ISIDNUM(x)
 584 #define is_idstart(x)   (ISIDST(x) || _dollar_ok(x))
 585 #define is_numstart(x)  ISDIGIT(x)
 586 #define is_hspace(x)    ISBLANK(x)
 587 #define is_vspace(x)    IS_VSPACE(x)
 588 #define is_nvspace(x)   IS_NVSPACE(x)
 589 #define is_space(x)     IS_SPACE_OR_NUL(x)
 590
 591 /* This table is constant if it can be initialized at compile time,
 592    which is the case if cpp was compiled with GCC >=2.7, or another
 593    compiler that supports C99.  */
 594 #if HAVE_DESIGNATED_INITIALIZERS
 595 extern const unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];
 596 #else
 597 extern unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];
 598 #endif
 599
 600 /* Macros.  */
 601
 602 static inline int cpp_in_system_header (cpp_reader *);
 603 static inline int
 604 cpp_in_system_header (cpp_reader *pfile)
 605 {
 606   return pfile->buffer ? pfile->buffer->sysp : 0;
 607 }
 608 #define CPP_PEDANTIC(PF) CPP_OPTION (PF, cpp_pedantic)
 609 #define CPP_WTRADITIONAL(PF) CPP_OPTION (PF, cpp_warn_traditional)
 610
 611 static inline int cpp_in_primary_file (cpp_reader *);
 612 static inline int
 613 cpp_in_primary_file (cpp_reader *pfile)
 614 {
 615   return pfile->line_table->depth == 1;
 616 }
 617
 618 /* In macro.c */
 619 extern void _cpp_free_definition (cpp_hashnode *);
 620 extern bool _cpp_create_definition (cpp_reader *, cpp_hashnode *);
 621 extern void _cpp_pop_context (cpp_reader *);
 622 extern void _cpp_push_text_context (cpp_reader *, cpp_hashnode *,
 623                                     const unsigned char *, size_t);
 624 extern bool _cpp_save_parameter (cpp_reader *, cpp_macro *, cpp_hashnode *,
 625                                  cpp_hashnode *);
 626 extern bool _cpp_arguments_ok (cpp_reader *, cpp_macro *, const cpp_hashnode *,
 627                                unsigned int);
 628 extern const unsigned char *_cpp_builtin_macro_text (cpp_reader *,
 629                                                      cpp_hashnode *,
 630                                                      source_location = 0);
 631 extern int _cpp_warn_if_unused_macro (cpp_reader *, cpp_hashnode *, void *);
 632 extern void _cpp_push_token_context (cpp_reader *, cpp_hashnode *,
 633                                      const cpp_token *, unsigned int);
 634 extern void _cpp_backup_tokens_direct (cpp_reader *, unsigned int);
 635
 636 /* In identifiers.c */
 637 extern void _cpp_init_hashtable (cpp_reader *, cpp_hash_table *);
 638 extern void _cpp_destroy_hashtable (cpp_reader *);
 639
 640 /* In files.c */
 641 typedef struct _cpp_file _cpp_file;
 642 extern _cpp_file *_cpp_find_file (cpp_reader *, const char *, cpp_dir *,
 643                                   bool, int, bool);
 644 extern bool _cpp_find_failed (_cpp_file *);
 645 extern void _cpp_mark_file_once_only (cpp_reader *, struct _cpp_file *);
 646 extern void _cpp_fake_include (cpp_reader *, const char *);
 647 extern bool _cpp_stack_file (cpp_reader *, _cpp_file*, bool);
 648 extern bool _cpp_stack_include (cpp_reader *, const char *, int,
 649                                 enum include_type);
 650 extern int _cpp_compare_file_date (cpp_reader *, const char *, int);
 651 extern void _cpp_report_missing_guards (cpp_reader *);
 652 extern void _cpp_init_files (cpp_reader *);
 653 extern void _cpp_cleanup_files (cpp_reader *);
 654 extern void _cpp_pop_file_buffer (cpp_reader *, struct _cpp_file *,
 655                                   const unsigned char *);
 656 extern bool _cpp_save_file_entries (cpp_reader *pfile, FILE *f);
 657 extern bool _cpp_read_file_entries (cpp_reader *, FILE *);
 658 extern const char *_cpp_get_file_name (_cpp_file *);
 659 extern struct stat *_cpp_get_file_stat (_cpp_file *);
 660 extern bool _cpp_has_header (cpp_reader *, const char *, int,
 661                              enum include_type);
 662
 663 /* In expr.c */
 664 extern bool _cpp_parse_expr (cpp_reader *, bool);
 665 extern struct op *_cpp_expand_op_stack (cpp_reader *);
 666
 667 /* In lex.c */
 668 extern void _cpp_process_line_notes (cpp_reader *, int);
 669 extern void _cpp_clean_line (cpp_reader *);
 670 extern bool _cpp_get_fresh_line (cpp_reader *);
 671 extern bool _cpp_skip_block_comment (cpp_reader *);
 672 extern cpp_token *_cpp_temp_token (cpp_reader *);
 673 extern const cpp_token *_cpp_lex_token (cpp_reader *);
 674 extern cpp_token *_cpp_lex_direct (cpp_reader *);
 675 extern unsigned char *_cpp_spell_ident_ucns (unsigned char *, cpp_hashnode *);
 676 extern int _cpp_equiv_tokens (const cpp_token *, const cpp_token *);
 677 extern void _cpp_init_tokenrun (tokenrun *, unsigned int);
 678 extern cpp_hashnode *_cpp_lex_identifier (cpp_reader *, const char *);
 679 extern int _cpp_remaining_tokens_num_in_context (cpp_context *);
 680 extern void _cpp_init_lexer (void);
 681
 682 /* In init.c.  */
 683 extern void _cpp_maybe_push_include_file (cpp_reader *);
 684 extern const char *cpp_named_operator2name (enum cpp_ttype type);
 685
 686 /* In directives.c */
 687 extern int _cpp_test_assertion (cpp_reader *, unsigned int *);
 688 extern int _cpp_handle_directive (cpp_reader *, int);
 689 extern void _cpp_define_builtin (cpp_reader *, const char *);
 690 extern char ** _cpp_save_pragma_names (cpp_reader *);
 691 extern void _cpp_restore_pragma_names (cpp_reader *, char **);
 692 extern int _cpp_do__Pragma (cpp_reader *, source_location);
 693 extern void _cpp_init_directives (cpp_reader *);
 694 extern void _cpp_init_internal_pragmas (cpp_reader *);
 695 extern void _cpp_do_file_change (cpp_reader *, enum lc_reason, const char *,
 696                                  linenum_type, unsigned int);
 697 extern void _cpp_pop_buffer (cpp_reader *);
 698 extern char *_cpp_bracket_include (cpp_reader *);
 699
 700 /* In directives.c */
 701 struct _cpp_dir_only_callbacks
 702 {
 703   /* Called to print a block of lines. */
 704   void (*print_lines) (int, const void *, size_t);
 705   void (*maybe_print_line) (source_location);
 706 };
 707
 708 extern void _cpp_preprocess_dir_only (cpp_reader *,
 709                                       const struct _cpp_dir_only_callbacks *);
 710
 711 /* In traditional.c.  */
 712 extern bool _cpp_scan_out_logical_line (cpp_reader *, cpp_macro *, bool);
 713 extern bool _cpp_read_logical_line_trad (cpp_reader *);
 714 extern void _cpp_overlay_buffer (cpp_reader *pfile, const unsigned char *,
 715                                  size_t);
 716 extern void _cpp_remove_overlay (cpp_reader *);
 717 extern bool _cpp_create_trad_definition (cpp_reader *, cpp_macro *);
 718 extern bool _cpp_expansions_different_trad (const cpp_macro *,
 719                                             const cpp_macro *);
 720 extern unsigned char *_cpp_copy_replacement_text (const cpp_macro *,
 721                                                   unsigned char *);
 722 extern size_t _cpp_replacement_text_len (const cpp_macro *);
 723
 724 /* In charset.c.  */
 725
 726 /* The normalization state at this point in the sequence.
 727    It starts initialized to all zeros, and at the end
 728    'level' is the normalization level of the sequence.  */
 729
 730 struct normalize_state
 731 {
 732   /* The previous starter character.  */
 733   cppchar_t previous;
 734   /* The combining class of the previous character (whether or not a
 735      starter).  */
 736   unsigned char prev_class;
 737   /* The lowest normalization level so far.  */
 738   enum cpp_normalize_level level;
 739 };
 740 #define INITIAL_NORMALIZE_STATE { 0, 0, normalized_KC }
 741 #define NORMALIZE_STATE_RESULT(st) ((st)->level)
 742
 743 /* We saw a character C that matches ISIDNUM(), update a
 744    normalize_state appropriately.  */
 745 #define NORMALIZE_STATE_UPDATE_IDNUM(st, c)     \
 746   ((st)->previous = (c), (st)->prev_class = 0)
 747
 748 extern bool _cpp_valid_ucn (cpp_reader *, const unsigned char **,
 749                             const unsigned char *, int,
 750                             struct normalize_state *state,
 751                             cppchar_t *);
 752 extern void _cpp_destroy_iconv (cpp_reader *);
 753 extern unsigned char *_cpp_convert_input (cpp_reader *, const char *,
 754                                           unsigned char *, size_t, size_t,
 755                                           const unsigned char **, off_t *);
 756 extern const char *_cpp_default_encoding (void);
 757 extern cpp_hashnode * _cpp_interpret_identifier (cpp_reader *pfile,
 758                                                  const unsigned char *id,
 759                                                  size_t len);
 760
 761 /* Utility routines and macros.  */
 762 #define DSC(str) (const unsigned char *)str, sizeof str - 1
 763
 764 /* These are inline functions instead of macros so we can get type
 765    checking.  */
 766 static inline int ustrcmp (const unsigned char *, const unsigned char *);
 767 static inline int ustrncmp (const unsigned char *, const unsigned char *,
 768                             size_t);
 769 static inline size_t ustrlen (const unsigned char *);
 770 static inline const unsigned char *uxstrdup (const unsigned char *);
 771 static inline const unsigned char *ustrchr (const unsigned char *, int);
 772 static inline int ufputs (const unsigned char *, FILE *);
 773
 774 /* Use a const char for the second parameter since it is usually a literal.  */
 775 static inline int ustrcspn (const unsigned char *, const char *);
 776
 777 static inline int
 778 ustrcmp (const unsigned char *s1, const unsigned char *s2)
 779 {
 780   return strcmp ((const char *)s1, (const char *)s2);
 781 }
 782
 783 static inline int
 784 ustrncmp (const unsigned char *s1, const unsigned char *s2, size_t n)
 785 {
 786   return strncmp ((const char *)s1, (const char *)s2, n);
 787 }
 788
 789 static inline int
 790 ustrcspn (const unsigned char *s1, const char *s2)
 791 {
 792   return strcspn ((const char *)s1, s2);
 793 }
 794
 795 static inline size_t
 796 ustrlen (const unsigned char *s1)
 797 {
 798   return strlen ((const char *)s1);
 799 }
 800
 801 static inline const unsigned char *
 802 uxstrdup (const unsigned char *s1)
 803 {
 804   return (const unsigned char *) xstrdup ((const char *)s1);
 805 }
 806
 807 static inline const unsigned char *
 808 ustrchr (const unsigned char *s1, int c)
 809 {
 810   return (const unsigned char *) strchr ((const char *)s1, c);
 811 }
 812
 813 static inline int
 814 ufputs (const unsigned char *s, FILE *f)
 815 {
 816   return fputs ((const char *)s, f);
 817 }
 818
 819   /* In line-map.c.  */
 820
 821 /* Create a macro map.  A macro map encodes source locations of tokens
 822    that are part of a macro replacement-list, at a macro expansion
 823    point. See the extensive comments of struct line_map and struct
 824    line_map_macro, in line-map.h.
 825
 826    This map shall be created when the macro is expanded. The map
 827    encodes the source location of the expansion point of the macro as
 828    well as the "original" source location of each token that is part
 829    of the macro replacement-list. If a macro is defined but never
 830    expanded, it has no macro map.  SET is the set of maps the macro
 831    map should be part of.  MACRO_NODE is the macro which the new macro
 832    map should encode source locations for.  EXPANSION is the location
 833    of the expansion point of MACRO. For function-like macros
 834    invocations, it's best to make it point to the closing parenthesis
 835    of the macro, rather than the the location of the first character
 836    of the macro.  NUM_TOKENS is the number of tokens that are part of
 837    the replacement-list of MACRO.  */
 838 const line_map_macro *linemap_enter_macro (struct line_maps *,
 839                                            struct cpp_hashnode*,
 840                                            source_location,
 841                                            unsigned int);
 842
 843 /* Create and return a virtual location for a token that is part of a
 844    macro expansion-list at a macro expansion point.  See the comment
 845    inside struct line_map_macro to see what an expansion-list exactly
 846    is.
 847
 848    A call to this function must come after a call to
 849    linemap_enter_macro.
 850
 851    MAP is the map into which the source location is created.  TOKEN_NO
 852    is the index of the token in the macro replacement-list, starting
 853    at number 0.
 854
 855    ORIG_LOC is the location of the token outside of this macro
 856    expansion.  If the token comes originally from the macro
 857    definition, it is the locus in the macro definition; otherwise it
 858    is a location in the context of the caller of this macro expansion
 859    (which is a virtual location or a source location if the caller is
 860    itself a macro expansion or not).
 861
 862    MACRO_DEFINITION_LOC is the location in the macro definition,
 863    either of the token itself or of a macro parameter that it
 864    replaces.  */
 865 source_location linemap_add_macro_token (const line_map_macro *,
 866                                          unsigned int,
 867                                          source_location,
 868                                          source_location);
 869
 870 /* Return the source line number corresponding to source location
 871    LOCATION.  SET is the line map set LOCATION comes from.  If
 872    LOCATION is the location of token that is part of the
 873    expansion-list of a macro expansion return the line number of the
 874    macro expansion point.  */
 875 int linemap_get_expansion_line (struct line_maps *,
 876                                 source_location);
 877
 878 /* Return the path of the file corresponding to source code location
 879    LOCATION.
 880
 881    If LOCATION is the location of a token that is part of the
 882    replacement-list of a macro expansion return the file path of the
 883    macro expansion point.
 884
 885    SET is the line map set LOCATION comes from.  */
 886 const char* linemap_get_expansion_filename (struct line_maps *,
 887                                             source_location);
 888
 889 #ifdef __cplusplus
 890 }
 891 #endif
 892
 893 #endif /* ! LIBCPP_INTERNAL_H */