gcc/cpplib.h

   1 /* Definitions for CPP library.
   2    Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
   3    Free Software Foundation, Inc.
   4    Written by Per Bothner, 1994-95.
   5
   6 This program is free software; you can redistribute it and/or modify it
   7 under the terms of the GNU General Public License as published by the
   8 Free Software Foundation; either version 2, or (at your option) any
   9 later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19
  20  In other words, you are welcome to use, share and improve this program.
  21  You are forbidden to forbid anyone else to use, share and improve
  22  what you give them.   Help stamp out software-hoarding!  */
  23 #ifndef GCC_CPPLIB_H
  24 #define GCC_CPPLIB_H
  25
  26 #include <sys/types.h>
  27 #include "hashtable.h"
  28 #include "line-map.h"
  29
  30 #ifdef __cplusplus
  31 extern "C" {
  32 #endif
  33
  34 /* For complex reasons, cpp_reader is also typedefed in c-pragma.h.  */
  35 #ifndef GCC_C_PRAGMA_H
  36 typedef struct cpp_reader cpp_reader;
  37 #endif
  38 typedef struct cpp_buffer cpp_buffer;
  39 typedef struct cpp_options cpp_options;
  40 typedef struct cpp_token cpp_token;
  41 typedef struct cpp_string cpp_string;
  42 typedef struct cpp_hashnode cpp_hashnode;
  43 typedef struct cpp_macro cpp_macro;
  44 typedef struct cpp_callbacks cpp_callbacks;
  45
  46 struct answer;
  47 struct file_name_map_list;
  48
  49 /* The first three groups, apart from '=', can appear in preprocessor
  50    expressions (+= and -= are used to indicate unary + and - resp.).
  51    This allows a lookup table to be implemented in _cpp_parse_expr.
  52
  53    The first group, to CPP_LAST_EQ, can be immediately followed by an
  54    '='.  The lexer needs operators ending in '=', like ">>=", to be in
  55    the same order as their counterparts without the '=', like ">>".  */
  56
  57 /* Positions in the table.  */
  58 #define CPP_LAST_EQ CPP_MAX
  59 #define CPP_FIRST_DIGRAPH CPP_HASH
  60 #define CPP_LAST_PUNCTUATOR CPP_DOT_STAR
  61 #define CPP_LAST_CPP_OP CPP_LESS_EQ
  62
  63 #define TTYPE_TABLE                             \
  64   OP(CPP_EQ = 0,        "=")                    \
  65   OP(CPP_NOT,           "!")                    \
  66   OP(CPP_GREATER,       ">")    /* compare */   \
  67   OP(CPP_LESS,          "<")                    \
  68   OP(CPP_PLUS,          "+")    /* math */      \
  69   OP(CPP_MINUS,         "-")                    \
  70   OP(CPP_MULT,          "*")                    \
  71   OP(CPP_DIV,           "/")                    \
  72   OP(CPP_MOD,           "%")                    \
  73   OP(CPP_AND,           "&")    /* bit ops */   \
  74   OP(CPP_OR,            "|")                    \
  75   OP(CPP_XOR,           "^")                    \
  76   OP(CPP_RSHIFT,        ">>")                   \
  77   OP(CPP_LSHIFT,        "<<")                   \
  78   OP(CPP_MIN,           "<?")   /* extension */ \
  79   OP(CPP_MAX,           ">?")                   \
  80 \
  81   OP(CPP_COMPL,         "~")                    \
  82   OP(CPP_AND_AND,       "&&")   /* logical */   \
  83   OP(CPP_OR_OR,         "||")                   \
  84   OP(CPP_QUERY,         "?")                    \
  85   OP(CPP_COLON,         ":")                    \
  86   OP(CPP_COMMA,         ",")    /* grouping */  \
  87   OP(CPP_OPEN_PAREN,    "(")                    \
  88   OP(CPP_CLOSE_PAREN,   ")")                    \
  89   TK(CPP_EOF,           SPELL_NONE)             \
  90   OP(CPP_EQ_EQ,         "==")   /* compare */   \
  91   OP(CPP_NOT_EQ,        "!=")                   \
  92   OP(CPP_GREATER_EQ,    ">=")                   \
  93   OP(CPP_LESS_EQ,       "<=")                   \
  94 \
  95   /* These two are unary + / - in preprocessor expressions.  */ \
  96   OP(CPP_PLUS_EQ,       "+=")   /* math */      \
  97   OP(CPP_MINUS_EQ,      "-=")                   \
  98 \
  99   OP(CPP_MULT_EQ,       "*=")                   \
 100   OP(CPP_DIV_EQ,        "/=")                   \
 101   OP(CPP_MOD_EQ,        "%=")                   \
 102   OP(CPP_AND_EQ,        "&=")   /* bit ops */   \
 103   OP(CPP_OR_EQ,         "|=")                   \
 104   OP(CPP_XOR_EQ,        "^=")                   \
 105   OP(CPP_RSHIFT_EQ,     ">>=")                  \
 106   OP(CPP_LSHIFT_EQ,     "<<=")                  \
 107   OP(CPP_MIN_EQ,        "<?=")  /* extension */ \
 108   OP(CPP_MAX_EQ,        ">?=")                  \
 109   /* Digraphs together, beginning with CPP_FIRST_DIGRAPH.  */   \
 110   OP(CPP_HASH,          "#")    /* digraphs */  \
 111   OP(CPP_PASTE,         "##")                   \
 112   OP(CPP_OPEN_SQUARE,   "[")                    \
 113   OP(CPP_CLOSE_SQUARE,  "]")                    \
 114   OP(CPP_OPEN_BRACE,    "{")                    \
 115   OP(CPP_CLOSE_BRACE,   "}")                    \
 116   /* The remainder of the punctuation.  Order is not significant.  */   \
 117   OP(CPP_SEMICOLON,     ";")    /* structure */ \
 118   OP(CPP_ELLIPSIS,      "...")                  \
 119   OP(CPP_PLUS_PLUS,     "++")   /* increment */ \
 120   OP(CPP_MINUS_MINUS,   "--")                   \
 121   OP(CPP_DEREF,         "->")   /* accessors */ \
 122   OP(CPP_DOT,           ".")                    \
 123   OP(CPP_SCOPE,         "::")                   \
 124   OP(CPP_DEREF_STAR,    "->*")                  \
 125   OP(CPP_DOT_STAR,      ".*")                   \
 126   OP(CPP_ATSIGN,        "@")  /* used in Objective C */ \
 127 \
 128   TK(CPP_NAME,          SPELL_IDENT)    /* word */                      \
 129   TK(CPP_NUMBER,        SPELL_NUMBER)   /* 34_be+ta  */                 \
 130 \
 131   TK(CPP_CHAR,          SPELL_STRING)   /* 'char' */                    \
 132   TK(CPP_WCHAR,         SPELL_STRING)   /* L'char' */                   \
 133   TK(CPP_OTHER,         SPELL_CHAR)     /* stray punctuation */         \
 134 \
 135   TK(CPP_STRING,        SPELL_STRING)   /* "string" */                  \
 136   TK(CPP_WSTRING,       SPELL_STRING)   /* L"string" */                 \
 137   TK(CPP_HEADER_NAME,   SPELL_STRING)   /* <stdio.h> in #include */     \
 138 \
 139   TK(CPP_COMMENT,       SPELL_NUMBER)   /* Only if output comments.  */ \
 140                                         /* SPELL_NUMBER happens to DTRT.  */ \
 141   TK(CPP_MACRO_ARG,     SPELL_NONE)     /* Macro argument.  */          \
 142   TK(CPP_PADDING,       SPELL_NONE)     /* Whitespace for cpp0.  */
 143
 144 #define OP(e, s) e,
 145 #define TK(e, s) e,
 146 enum cpp_ttype
 147 {
 148   TTYPE_TABLE
 149   N_TTYPES
 150 };
 151 #undef OP
 152 #undef TK
 153
 154 /* C language kind, used when calling cpp_reader_init.  */
 155 enum c_lang {CLK_GNUC89 = 0, CLK_GNUC99, CLK_STDC89, CLK_STDC94, CLK_STDC99,
 156              CLK_GNUCXX, CLK_CXX98, CLK_OBJC, CLK_OBJCXX, CLK_ASM};
 157
 158 /* Payload of a NUMBER, STRING, CHAR or COMMENT token.  */
 159 struct cpp_string
 160 {
 161   unsigned int len;
 162   const unsigned char *text;
 163 };
 164
 165 /* Flags for the cpp_token structure.  */
 166 #define PREV_WHITE      (1 << 0) /* If whitespace before this token.  */
 167 #define DIGRAPH         (1 << 1) /* If it was a digraph.  */
 168 #define STRINGIFY_ARG   (1 << 2) /* If macro argument to be stringified.  */
 169 #define PASTE_LEFT      (1 << 3) /* If on LHS of a ## operator.  */
 170 #define NAMED_OP        (1 << 4) /* C++ named operators.  */
 171 #define NO_EXPAND       (1 << 5) /* Do not macro-expand this token.  */
 172 #define BOL             (1 << 6) /* Token at beginning of line.  */
 173
 174 /* A preprocessing token.  This has been carefully packed and should
 175    occupy 16 bytes on 32-bit hosts and 24 bytes on 64-bit hosts.  */
 176 struct cpp_token
 177 {
 178   unsigned int line;            /* Logical line of first char of token.  */
 179   unsigned short col;           /* Column of first char of token.  */
 180   ENUM_BITFIELD(cpp_ttype) type : CHAR_BIT;  /* token type */
 181   unsigned char flags;          /* flags - see above */
 182
 183   union
 184   {
 185     cpp_hashnode *node;         /* An identifier.  */
 186     const cpp_token *source;    /* Inherit padding from this token.  */
 187     struct cpp_string str;      /* A string, or number.  */
 188     unsigned int arg_no;        /* Argument no. for a CPP_MACRO_ARG.  */
 189     unsigned char c;            /* Character represented by CPP_OTHER.  */
 190   } val;
 191 };
 192
 193 /* A type wide enough to hold any multibyte source character.
 194    cpplib's character constant interpreter requires an unsigned type.
 195    Also, a typedef for the signed equivalent.  */
 196 #ifndef MAX_WCHAR_TYPE_SIZE
 197 # define MAX_WCHAR_TYPE_SIZE WCHAR_TYPE_SIZE
 198 #endif
 199 #if CHAR_BIT * SIZEOF_INT >= MAX_WCHAR_TYPE_SIZE
 200 # define CPPCHAR_SIGNED_T int
 201 #else
 202 # if CHAR_BIT * SIZEOF_LONG >= MAX_WCHAR_TYPE_SIZE || !HAVE_LONG_LONG
 203 #  define CPPCHAR_SIGNED_T long
 204 # else
 205 #  define CPPCHAR_SIGNED_T long long
 206 # endif
 207 #endif
 208 typedef unsigned CPPCHAR_SIGNED_T cppchar_t;
 209 typedef CPPCHAR_SIGNED_T cppchar_signed_t;
 210
 211 /* Values for opts.dump_macros.
 212   dump_only means inhibit output of the preprocessed text
 213              and instead output the definitions of all user-defined
 214              macros in a form suitable for use as input to cpp.
 215    dump_names means pass #define and the macro name through to output.
 216    dump_definitions means pass the whole definition (plus #define) through
 217 */
 218 enum { dump_none = 0, dump_only, dump_names, dump_definitions };
 219
 220 /* This structure is nested inside struct cpp_reader, and
 221    carries all the options visible to the command line.  */
 222 struct cpp_options
 223 {
 224   /* Name of input and output files.  */
 225   const char *in_fname;
 226   const char *out_fname;
 227
 228   /* Characters between tab stops.  */
 229   unsigned int tabstop;
 230
 231   /* Pending options - -D, -U, -A, -I, -ixxx.  */
 232   struct cpp_pending *pending;
 233
 234   /* File name which deps are being written to.  This is 0 if deps are
 235      being written to stdout.  */
 236   const char *deps_file;
 237
 238   /* Search paths for include files.  */
 239   struct search_path *quote_include;    /* "" */
 240   struct search_path *bracket_include;  /* <> */
 241
 242   /* Map between header names and file names, used only on DOS where
 243      file names are limited in length.  */
 244   struct file_name_map_list *map_list;
 245
 246   /* Directory prefix that should replace `/usr/lib/gcc-lib/TARGET/VERSION'
 247      in the standard include file directories.  */
 248   const char *include_prefix;
 249   unsigned int include_prefix_len;
 250
 251   /* -fleading_underscore sets this to "_".  */
 252   const char *user_label_prefix;
 253
 254   /* Precision for target CPP arithmetic, target characters, target
 255      ints and target wide characters, respectively.  */
 256   size_t precision, char_precision, int_precision, wchar_precision;
 257
 258   /* The language we're preprocessing.  */
 259   enum c_lang lang;
 260
 261   /* Non-0 means -v, so print the full set of include dirs.  */
 262   unsigned char verbose;
 263
 264   /* Nonzero means chars are signed.  */
 265   unsigned char signed_char;
 266
 267   /* Nonzero means use extra default include directories for C++.  */
 268   unsigned char cplusplus;
 269
 270   /* Nonzero means handle cplusplus style comments */
 271   unsigned char cplusplus_comments;
 272
 273   /* Nonzero means handle #import, for objective C.  */
 274   unsigned char objc;
 275
 276   /* Nonzero means don't copy comments into the output file.  */
 277   unsigned char discard_comments;
 278
 279   /* Nonzero means don't copy comments into the output file during
 280      macro expansion.  */
 281   unsigned char discard_comments_in_macro_exp;
 282
 283   /* Nonzero means process the ISO trigraph sequences.  */
 284   unsigned char trigraphs;
 285
 286   /* Nonzero means process the ISO digraph sequences.  */
 287   unsigned char digraphs;
 288
 289   /* Nonzero means to allow hexadecimal floats and LL suffixes.  */
 290   unsigned char extended_numbers;
 291
 292   /* Nonzero means print the names of included files rather than the
 293      preprocessed output.  1 means just the #include "...", 2 means
 294      #include <...> as well.  */
 295   unsigned char print_deps;
 296
 297   /* Nonzero if phony targets are created for each header.  */
 298   unsigned char deps_phony_targets;
 299
 300   /* Nonzero if missing .h files in -M output are assumed to be
 301      generated files and not errors.  */
 302   unsigned char print_deps_missing_files;
 303
 304   /* If true, fopen (deps_file, "a") else fopen (deps_file, "w").  */
 305   unsigned char print_deps_append;
 306
 307   /* Nonzero means print names of header files (-H).  */
 308   unsigned char print_include_names;
 309
 310   /* Nonzero means cpp_pedwarn causes a hard error.  */
 311   unsigned char pedantic_errors;
 312
 313   /* Nonzero means don't print warning messages.  */
 314   unsigned char inhibit_warnings;
 315
 316   /* Nonzero means don't suppress warnings from system headers.  */
 317   unsigned char warn_system_headers;
 318
 319   /* Nonzero means don't print error messages.  Has no option to
 320      select it, but can be set by a user of cpplib (e.g. fix-header).  */
 321   unsigned char inhibit_errors;
 322
 323   /* Nonzero means warn if slash-star appears in a comment.  */
 324   unsigned char warn_comments;
 325
 326   /* Nonzero means warn if there are any trigraphs.  */
 327   unsigned char warn_trigraphs;
 328
 329   /* Nonzero means warn if #import is used.  */
 330   unsigned char warn_import;
 331
 332   /* Nonzero means warn about multicharacter charconsts.  */
 333   unsigned char warn_multichar;
 334
 335   /* Nonzero means warn about various incompatibilities with
 336      traditional C.  */
 337   unsigned char warn_traditional;
 338
 339   /* Nonzero means warn about text after an #endif (or #else).  */
 340   unsigned char warn_endif_labels;
 341
 342   /* Nonzero means turn warnings into errors.  */
 343   unsigned char warnings_are_errors;
 344
 345   /* Nonzero causes output not to be done, but directives such as
 346      #define that have side effects are still obeyed.  */
 347   unsigned char no_output;
 348
 349   /* Nonzero means we should look for header.gcc files that remap file
 350      names.  */
 351   unsigned char remap;
 352
 353   /* Nonzero means don't output line number information.  */
 354   unsigned char no_line_commands;
 355
 356   /* Nonzero means -I- has been seen, so don't look for #include "foo"
 357      the source-file directory.  */
 358   unsigned char ignore_srcdir;
 359
 360   /* Zero means dollar signs are punctuation.  */
 361   unsigned char dollars_in_ident;
 362
 363   /* Nonzero means warn if undefined identifiers are evaluated in an #if.  */
 364   unsigned char warn_undef;
 365
 366   /* Nonzero for the 1999 C Standard, including corrigenda and amendments.  */
 367   unsigned char c99;
 368
 369   /* Nonzero means give all the error messages the ANSI standard requires.  */
 370   unsigned char pedantic;
 371
 372   /* Nonzero means we're looking at already preprocessed code, so don't
 373      bother trying to do macro expansion and whatnot.  */
 374   unsigned char preprocessed;
 375
 376   /* Nonzero disables all the standard directories for headers.  */
 377   unsigned char no_standard_includes;
 378
 379   /* Nonzero disables the C++-specific standard directories for headers.  */
 380   unsigned char no_standard_cplusplus_includes;
 381
 382   /* Nonzero means dump macros in some fashion - see above.  */
 383   unsigned char dump_macros;
 384
 385   /* Nonzero means pass #include lines through to the output.  */
 386   unsigned char dump_includes;
 387
 388   /* Print column number in error messages.  */
 389   unsigned char show_column;
 390
 391   /* Nonzero means handle C++ alternate operator names.  */
 392   unsigned char operator_names;
 393
 394   /* True if --help, --version or --target-help appeared in the
 395      options.  Stand-alone CPP should then bail out after option
 396      parsing; drivers might want to continue printing help.  */
 397   unsigned char help_only;
 398 };
 399
 400 /* Call backs.  */
 401 struct cpp_callbacks
 402 {
 403   /* Called when a new line of preprocessed output is started.  */
 404   void (*line_change) PARAMS ((cpp_reader *, const cpp_token *, int));
 405   void (*file_change) PARAMS ((cpp_reader *, const struct line_map *));
 406   void (*include) PARAMS ((cpp_reader *, unsigned int,
 407                            const unsigned char *, const cpp_token *));
 408   void (*define) PARAMS ((cpp_reader *, unsigned int, cpp_hashnode *));
 409   void (*undef) PARAMS ((cpp_reader *, unsigned int, cpp_hashnode *));
 410   void (*ident) PARAMS ((cpp_reader *, unsigned int, const cpp_string *));
 411   void (*def_pragma) PARAMS ((cpp_reader *, unsigned int));
 412   /* Called when the client has a chance to properly register
 413      built-ins with cpp_define() and cpp_assert().  */
 414   void (*register_builtins) PARAMS ((cpp_reader *));
 415 };
 416
 417 #define CPP_FATAL_LIMIT 1000
 418 /* True if we have seen a "fatal" error.  */
 419 #define CPP_FATAL_ERRORS(PFILE) (cpp_errors (PFILE) >= CPP_FATAL_LIMIT)
 420
 421 /* Name under which this program was invoked.  */
 422 extern const char *progname;
 423
 424 /* The structure of a node in the hash table.  The hash table has
 425    entries for all identifiers: either macros defined by #define
 426    commands (type NT_MACRO), assertions created with #assert
 427    (NT_ASSERTION), or neither of the above (NT_VOID).  Builtin macros
 428    like __LINE__ are flagged NODE_BUILTIN.  Poisioned identifiers are
 429    flagged NODE_POISONED.  NODE_OPERATOR (C++ only) indicates an
 430    identifier that behaves like an operator such as "xor".
 431    NODE_DIAGNOSTIC is for speed in lex_token: it indicates a
 432    diagnostic may be required for this node.  Currently this only
 433    applies to __VA_ARGS__ and poisoned identifiers.  */
 434
 435 /* Hash node flags.  */
 436 #define NODE_OPERATOR   (1 << 0)        /* C++ named operator.  */
 437 #define NODE_POISONED   (1 << 1)        /* Poisoned identifier.  */
 438 #define NODE_BUILTIN    (1 << 2)        /* Builtin macro.  */
 439 #define NODE_DIAGNOSTIC (1 << 3)        /* Possible diagnostic when lexed.  */
 440 #define NODE_WARN       (1 << 4)        /* Warn if redefined or undefined.  */
 441 #define NODE_DISABLED   (1 << 5)        /* A disabled macro.  */
 442
 443 /* Different flavors of hash node.  */
 444 enum node_type
 445 {
 446   NT_VOID = 0,     /* No definition yet.  */
 447   NT_MACRO,        /* A macro of some form.  */
 448   NT_ASSERTION     /* Predicate for #assert.  */
 449 };
 450
 451 /* Different flavors of builtin macro.  _Pragma is an operator, but we
 452    handle it with the builtin code for efficiency reasons.  */
 453 enum builtin_type
 454 {
 455   BT_SPECLINE = 0,              /* `__LINE__' */
 456   BT_DATE,                      /* `__DATE__' */
 457   BT_FILE,                      /* `__FILE__' */
 458   BT_BASE_FILE,                 /* `__BASE_FILE__' */
 459   BT_INCLUDE_LEVEL,             /* `__INCLUDE_LEVEL__' */
 460   BT_TIME,                      /* `__TIME__' */
 461   BT_STDC,                      /* `__STDC__' */
 462   BT_PRAGMA                     /* `_Pragma' operator */
 463 };
 464
 465 #define CPP_HASHNODE(HNODE)     ((cpp_hashnode *) (HNODE))
 466 #define HT_NODE(NODE)           ((ht_identifier *) (NODE))
 467 #define NODE_LEN(NODE)          HT_LEN (&(NODE)->ident)
 468 #define NODE_NAME(NODE)         HT_STR (&(NODE)->ident)
 469
 470 /* The common part of an identifier node shared amongst all 3 C front
 471    ends.  Also used to store CPP identifiers, which are a superset of
 472    identifiers in the grammatical sense.  */
 473 struct cpp_hashnode
 474 {
 475   struct ht_identifier ident;
 476   unsigned short arg_index;             /* Macro argument index.  */
 477   unsigned char directive_index;        /* Index into directive table.  */
 478   unsigned char rid_code;               /* Rid code - for front ends.  */
 479   ENUM_BITFIELD(node_type) type : 8;    /* CPP node type.  */
 480   unsigned char flags;                  /* CPP flags.  */
 481
 482   union
 483   {
 484     cpp_macro *macro;                   /* If a macro.  */
 485     struct answer *answers;             /* Answers to an assertion.  */
 486     enum cpp_ttype operator;            /* Code for a named operator.  */
 487     enum builtin_type builtin;          /* Code for a builtin macro.  */
 488   } value;
 489 };
 490
 491 /* Call this first to get a handle to pass to other functions.  */
 492 extern cpp_reader *cpp_create_reader PARAMS ((enum c_lang));
 493
 494 /* Call these to get pointers to the options and callback structures
 495    for a given reader.  These pointers are good until you call
 496    cpp_finish on that reader.  You can either edit the callbacks
 497    through the pointer returned from cpp_get_callbacks, or set them
 498    with cpp_set_callbacks.  */
 499 extern cpp_options *cpp_get_options PARAMS ((cpp_reader *));
 500 extern const struct line_maps *cpp_get_line_maps PARAMS ((cpp_reader *));
 501 extern cpp_callbacks *cpp_get_callbacks PARAMS ((cpp_reader *));
 502 extern void cpp_set_callbacks PARAMS ((cpp_reader *, cpp_callbacks *));
 503
 504 /* Now call cpp_handle_option[s] to handle 1[or more] switches.  The
 505    return value is the number of arguments used.  If
 506    cpp_handle_options returns without using all arguments, it couldn't
 507    understand the next switch.  When there are no switches left, you
 508    must call cpp_post_options before calling cpp_read_main_file.  Only
 509    after cpp_post_options are the contents of the cpp_options
 510    structure reliable.  Options processing is not completed until you
 511    call cpp_finish_options.  */
 512 extern int cpp_handle_options PARAMS ((cpp_reader *, int, char **));
 513 extern int cpp_handle_option PARAMS ((cpp_reader *, int, char **, int));
 514 extern void cpp_post_options PARAMS ((cpp_reader *));
 515
 516 /* This function reads the file, but does not start preprocessing.  It
 517    returns the name of the original file; this is the same as the
 518    input file, except for preprocessed input.  This will generate at
 519    least one file change callback, and possibly a line change callback
 520    too.  If there was an error opening the file, it returns NULL.
 521
 522    If you want cpplib to manage its own hashtable, pass in a NULL
 523    pointer.  Otherise you should pass in an initialised hash table
 524    that cpplib will share; this technique is used by the C front
 525    ends.  */
 526 extern const char *cpp_read_main_file PARAMS ((cpp_reader *, const char *,
 527                                                struct ht *));
 528
 529 /* Deferred handling of command line options that can generate debug
 530    callbacks, such as -D and -imacros.  Call this after
 531    cpp_read_main_file.  The front ends need this separation so they
 532    can initialize debug output with the original file name, returned
 533    from cpp_read_main_file, before they get debug callbacks.  */
 534 extern void cpp_finish_options PARAMS ((cpp_reader *));
 535
 536 /* Call this to release the handle at the end of preprocessing.  Any
 537    use of the handle after this function returns is invalid.  Returns
 538    cpp_errors (pfile).  */
 539 extern int cpp_destroy PARAMS ((cpp_reader *));
 540
 541 /* Error count.  */
 542 extern unsigned int cpp_errors PARAMS ((cpp_reader *));
 543
 544 extern unsigned int cpp_token_len PARAMS ((const cpp_token *));
 545 extern unsigned char *cpp_token_as_text PARAMS ((cpp_reader *,
 546                                                  const cpp_token *));
 547 extern unsigned char *cpp_spell_token PARAMS ((cpp_reader *, const cpp_token *,
 548                                                unsigned char *));
 549 extern void cpp_register_pragma PARAMS ((cpp_reader *,
 550                                          const char *, const char *,
 551                                          void (*) PARAMS ((cpp_reader *))));
 552
 553 extern void cpp_finish PARAMS ((cpp_reader *));
 554 extern int cpp_avoid_paste PARAMS ((cpp_reader *, const cpp_token *,
 555                                     const cpp_token *));
 556 extern const cpp_token *cpp_get_token PARAMS ((cpp_reader *));
 557 extern const unsigned char *cpp_macro_definition PARAMS ((cpp_reader *,
 558                                                   const cpp_hashnode *));
 559 extern void _cpp_backup_tokens PARAMS ((cpp_reader *, unsigned int));
 560
 561 /* Evaluate a CPP_CHAR or CPP_WCHAR token.  */
 562 extern cppchar_t
 563 cpp_interpret_charconst PARAMS ((cpp_reader *, const cpp_token *,
 564                                  unsigned int *, int *));
 565
 566 /* Used to register builtins during the register_builtins callback.
 567    The text is the same as the command line argument.  */
 568 extern void cpp_define PARAMS ((cpp_reader *, const char *));
 569 extern void cpp_assert PARAMS ((cpp_reader *, const char *));
 570 extern void cpp_undef  PARAMS ((cpp_reader *, const char *));
 571 extern void cpp_unassert PARAMS ((cpp_reader *, const char *));
 572
 573 extern cpp_buffer *cpp_push_buffer PARAMS ((cpp_reader *,
 574                                             const unsigned char *, size_t,
 575                                             int, int));
 576 extern int cpp_defined PARAMS ((cpp_reader *, const unsigned char *, int));
 577
 578 /* Diagnostic levels.  To get a dianostic without associating a
 579    position in the translation unit with it, use cpp_error_with_line
 580    with a line number of zero.  */
 581
 582 /* Warning, an error with -Werror.  */
 583 #define DL_WARNING              0x00
 584 /* Same as DL_WARNING, except it is not suppressed in system headers.  */
 585 #define DL_WARNING_SYSHDR       0x01
 586 /* Warning, an error with -pedantic-errors or -Werror.  */
 587 #define DL_PEDWARN              0x02
 588 /* An error.  */
 589 #define DL_ERROR                0x03
 590 /* A fatal error.  We do not exit, to support use of cpplib as a
 591    library, but may only return CPP_EOF tokens thereon.  It is the
 592    caller's responsibility to check CPP_FATAL_ERRORS.  */
 593 #define DL_FATAL                0x04
 594 /* An internal consistency check failed.  Prints "internal error: ",
 595    otherwise the same as DL_FATAL.  */
 596 #define DL_ICE                  0x05
 597 /* Extracts a diagnostic level from an int.  */
 598 #define DL_EXTRACT(l)           (l & 0xf)
 599 /* Non-zero if a diagnostic level is one of the warnings.  */
 600 #define DL_WARNING_P(l)         (DL_EXTRACT (l) >= DL_WARNING \
 601                                  && DL_EXTRACT (l) <= DL_PEDWARN)
 602
 603 /* N.B. The error-message-printer prototypes have not been nicely
 604    formatted because exgettext needs to see 'msgid' on the same line
 605    as the name of the function in order to work properly.  Only the
 606    string argument gets a name in an effort to keep the lines from
 607    getting ridiculously oversized.  */
 608
 609 /* Output a diagnostic of some kind.  */
 610 extern void cpp_error PARAMS ((cpp_reader *, int, const char *msgid, ...))
 611   ATTRIBUTE_PRINTF_3;
 612
 613 /* Output a diagnostic of severity LEVEL, with "MSG: " preceding the
 614    error string of errno.  No location is printed.  */
 615 extern void cpp_errno PARAMS ((cpp_reader *, int level, const char *msg));
 616
 617 /* Same as cpp_error, except additionally specifies a position as a
 618    (translation unit) physical line and physical column.  If the line is
 619    zero, then no location is printed.  */
 620 extern void cpp_error_with_line PARAMS ((cpp_reader *, int, unsigned, unsigned, const char *msgid, ...))
 621   ATTRIBUTE_PRINTF_5;
 622
 623 /* In cpplex.c */
 624 extern int cpp_ideq                     PARAMS ((const cpp_token *,
 625                                                  const char *));
 626 extern void cpp_output_line             PARAMS ((cpp_reader *, FILE *));
 627 extern void cpp_output_token            PARAMS ((const cpp_token *, FILE *));
 628 extern const char *cpp_type2name        PARAMS ((enum cpp_ttype));
 629 /* Returns the value of an escape sequence, truncated to the correct
 630    target precision.  PSTR points to the input pointer, which is just
 631    after the backslash.  LIMIT is how much text we have.  WIDE is true
 632    if the escape sequence is part of a wide character constant or
 633    string literal.  Handles all relevant diagnostics.  */
 634 extern cppchar_t cpp_parse_escape       PARAMS ((cpp_reader *,
 635                                                  const unsigned char ** pstr,
 636                                                  const unsigned char *limit,
 637                                                  int wide));
 638
 639 /* In cpphash.c */
 640
 641 /* Lookup an identifier in the hashtable.  Puts the identifier in the
 642    table if it is not already there.  */
 643 extern cpp_hashnode *cpp_lookup         PARAMS ((cpp_reader *,
 644                                                  const unsigned char *,
 645                                                  unsigned int));
 646
 647 typedef int (*cpp_cb) PARAMS ((cpp_reader *, cpp_hashnode *, void *));
 648 extern void cpp_forall_identifiers      PARAMS ((cpp_reader *,
 649                                                  cpp_cb, void *));
 650
 651 /* In cppmacro.c */
 652 extern void cpp_scan_nooutput           PARAMS ((cpp_reader *));
 653 extern int  cpp_sys_macro_p             PARAMS ((cpp_reader *));
 654 extern unsigned char *cpp_quote_string  PARAMS ((unsigned char *,
 655                                                  const unsigned char *,
 656                                                  unsigned int));
 657
 658 /* In cppfiles.c */
 659 extern int cpp_included PARAMS ((cpp_reader *, const char *));
 660 extern void cpp_make_system_header PARAMS ((cpp_reader *, int, int));
 661
 662 /* In cppmain.c */
 663 extern void cpp_preprocess_file PARAMS ((cpp_reader *));
 664
 665 #ifdef __cplusplus
 666 }
 667 #endif
 668
 669 #endif /* ! GCC_CPPLIB_H */