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_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   /* The language we're preprocessing.  */
 252   enum c_lang lang;
 253
 254   /* Non-0 means -v, so print the full set of include dirs.  */
 255   unsigned char verbose;
 256
 257   /* Nonzero means use extra default include directories for C++.  */
 258   unsigned char cplusplus;
 259
 260   /* Nonzero means handle cplusplus style comments */
 261   unsigned char cplusplus_comments;
 262
 263   /* Nonzero means define __OBJC__, treat @ as a special token, and
 264      use the OBJC[PLUS]_INCLUDE_PATH environment variable.  */
 265   unsigned char objc;
 266
 267   /* Nonzero means don't copy comments into the output file.  */
 268   unsigned char discard_comments;
 269
 270   /* Nonzero means don't copy comments into the output file during
 271      macro expansion.  */
 272   unsigned char discard_comments_in_macro_exp;
 273
 274   /* Nonzero means process the ISO trigraph sequences.  */
 275   unsigned char trigraphs;
 276
 277   /* Nonzero means process the ISO digraph sequences.  */
 278   unsigned char digraphs;
 279
 280   /* Nonzero means to allow hexadecimal floats and LL suffixes.  */
 281   unsigned char extended_numbers;
 282
 283   /* Nonzero means print the names of included files rather than the
 284      preprocessed output.  1 means just the #include "...", 2 means
 285      #include <...> as well.  */
 286   unsigned char print_deps;
 287
 288   /* Nonzero if phony targets are created for each header.  */
 289   unsigned char deps_phony_targets;
 290
 291   /* Nonzero if missing .h files in -M output are assumed to be
 292      generated files and not errors.  */
 293   unsigned char print_deps_missing_files;
 294
 295   /* If true, fopen (deps_file, "a") else fopen (deps_file, "w").  */
 296   unsigned char print_deps_append;
 297
 298   /* Nonzero means print names of header files (-H).  */
 299   unsigned char print_include_names;
 300
 301   /* Nonzero means cpp_pedwarn causes a hard error.  */
 302   unsigned char pedantic_errors;
 303
 304   /* Nonzero means don't print warning messages.  */
 305   unsigned char inhibit_warnings;
 306
 307   /* Nonzero means don't suppress warnings from system headers.  */
 308   unsigned char warn_system_headers;
 309
 310   /* Nonzero means don't print error messages.  Has no option to
 311      select it, but can be set by a user of cpplib (e.g. fix-header).  */
 312   unsigned char inhibit_errors;
 313
 314   /* Nonzero means warn if slash-star appears in a comment.  */
 315   unsigned char warn_comments;
 316
 317   /* Nonzero means warn if there are any trigraphs.  */
 318   unsigned char warn_trigraphs;
 319
 320   /* Nonzero means warn if #import is used.  */
 321   unsigned char warn_import;
 322
 323   /* Nonzero means warn about multicharacter charconsts.  */
 324   unsigned char warn_multichar;
 325
 326   /* Nonzero means warn about various incompatibilities with
 327      traditional C.  */
 328   unsigned char warn_traditional;
 329
 330   /* Nonzero means warn about text after an #endif (or #else).  */
 331   unsigned char warn_endif_labels;
 332
 333   /* Nonzero means turn warnings into errors.  */
 334   unsigned char warnings_are_errors;
 335
 336   /* Nonzero causes output not to be done, but directives such as
 337      #define that have side effects are still obeyed.  */
 338   unsigned char no_output;
 339
 340   /* Nonzero means we should look for header.gcc files that remap file
 341      names.  */
 342   unsigned char remap;
 343
 344   /* Nonzero means don't output line number information.  */
 345   unsigned char no_line_commands;
 346
 347   /* Nonzero means -I- has been seen, so don't look for #include "foo"
 348      the source-file directory.  */
 349   unsigned char ignore_srcdir;
 350
 351   /* Zero means dollar signs are punctuation.  */
 352   unsigned char dollars_in_ident;
 353
 354   /* Nonzero means warn if undefined identifiers are evaluated in an #if.  */
 355   unsigned char warn_undef;
 356
 357   /* Nonzero for the 1999 C Standard, including corrigenda and amendments.  */
 358   unsigned char c99;
 359
 360   /* Nonzero means give all the error messages the ANSI standard requires.  */
 361   unsigned char pedantic;
 362
 363   /* Nonzero means we're looking at already preprocessed code, so don't
 364      bother trying to do macro expansion and whatnot.  */
 365   unsigned char preprocessed;
 366
 367   /* Nonzero disables all the standard directories for headers.  */
 368   unsigned char no_standard_includes;
 369
 370   /* Nonzero disables the C++-specific standard directories for headers.  */
 371   unsigned char no_standard_cplusplus_includes;
 372
 373   /* Nonzero means dump macros in some fashion - see above.  */
 374   unsigned char dump_macros;
 375
 376   /* Nonzero means pass #include lines through to the output.  */
 377   unsigned char dump_includes;
 378
 379   /* Print column number in error messages.  */
 380   unsigned char show_column;
 381
 382   /* Nonzero means handle C++ alternate operator names.  */
 383   unsigned char operator_names;
 384
 385   /* True if --help, --version or --target-help appeared in the
 386      options.  Stand-alone CPP should then bail out after option
 387      parsing; drivers might want to continue printing help.  */
 388   unsigned char help_only;
 389
 390   /* True for traditional preprocessing.  */
 391   unsigned char traditional;
 392
 393   /* Target-specific features set by the front end or client.  */
 394
 395   /* Precision for target CPP arithmetic, target characters, target
 396      ints and target wide characters, respectively.  */
 397   size_t precision, char_precision, int_precision, wchar_precision;
 398
 399   /* Nonzero means chars (wide chars) are unsigned.  */
 400   unsigned char unsigned_char, unsigned_wchar;
 401
 402   /* Nonzero means __STDC__ should have the value 0 in system headers.  */
 403   unsigned char stdc_0_in_system_headers;
 404 };
 405
 406 /* Call backs.  */
 407 struct cpp_callbacks
 408 {
 409   /* Called when a new line of preprocessed output is started.  */
 410   void (*line_change) PARAMS ((cpp_reader *, const cpp_token *, int));
 411   void (*file_change) PARAMS ((cpp_reader *, const struct line_map *));
 412   void (*include) PARAMS ((cpp_reader *, unsigned int,
 413                            const unsigned char *, const cpp_token *));
 414   void (*define) PARAMS ((cpp_reader *, unsigned int, cpp_hashnode *));
 415   void (*undef) PARAMS ((cpp_reader *, unsigned int, cpp_hashnode *));
 416   void (*ident) PARAMS ((cpp_reader *, unsigned int, const cpp_string *));
 417   void (*def_pragma) PARAMS ((cpp_reader *, unsigned int));
 418   /* Called when the client has a chance to properly register
 419      built-ins with cpp_define() and cpp_assert().  */
 420   void (*register_builtins) PARAMS ((cpp_reader *));
 421 };
 422
 423 #define CPP_FATAL_LIMIT 1000
 424 /* True if we have seen a "fatal" error.  */
 425 #define CPP_FATAL_ERRORS(PFILE) (cpp_errors (PFILE) >= CPP_FATAL_LIMIT)
 426
 427 /* Name under which this program was invoked.  */
 428 extern const char *progname;
 429
 430 /* The structure of a node in the hash table.  The hash table has
 431    entries for all identifiers: either macros defined by #define
 432    commands (type NT_MACRO), assertions created with #assert
 433    (NT_ASSERTION), or neither of the above (NT_VOID).  Builtin macros
 434    like __LINE__ are flagged NODE_BUILTIN.  Poisioned identifiers are
 435    flagged NODE_POISONED.  NODE_OPERATOR (C++ only) indicates an
 436    identifier that behaves like an operator such as "xor".
 437    NODE_DIAGNOSTIC is for speed in lex_token: it indicates a
 438    diagnostic may be required for this node.  Currently this only
 439    applies to __VA_ARGS__ and poisoned identifiers.  */
 440
 441 /* Hash node flags.  */
 442 #define NODE_OPERATOR   (1 << 0)        /* C++ named operator.  */
 443 #define NODE_POISONED   (1 << 1)        /* Poisoned identifier.  */
 444 #define NODE_BUILTIN    (1 << 2)        /* Builtin macro.  */
 445 #define NODE_DIAGNOSTIC (1 << 3)        /* Possible diagnostic when lexed.  */
 446 #define NODE_WARN       (1 << 4)        /* Warn if redefined or undefined.  */
 447 #define NODE_DISABLED   (1 << 5)        /* A disabled macro.  */
 448
 449 /* Different flavors of hash node.  */
 450 enum node_type
 451 {
 452   NT_VOID = 0,     /* No definition yet.  */
 453   NT_MACRO,        /* A macro of some form.  */
 454   NT_ASSERTION     /* Predicate for #assert.  */
 455 };
 456
 457 /* Different flavors of builtin macro.  _Pragma is an operator, but we
 458    handle it with the builtin code for efficiency reasons.  */
 459 enum builtin_type
 460 {
 461   BT_SPECLINE = 0,              /* `__LINE__' */
 462   BT_DATE,                      /* `__DATE__' */
 463   BT_FILE,                      /* `__FILE__' */
 464   BT_BASE_FILE,                 /* `__BASE_FILE__' */
 465   BT_INCLUDE_LEVEL,             /* `__INCLUDE_LEVEL__' */
 466   BT_TIME,                      /* `__TIME__' */
 467   BT_STDC,                      /* `__STDC__' */
 468   BT_PRAGMA                     /* `_Pragma' operator */
 469 };
 470
 471 #define CPP_HASHNODE(HNODE)     ((cpp_hashnode *) (HNODE))
 472 #define HT_NODE(NODE)           ((ht_identifier *) (NODE))
 473 #define NODE_LEN(NODE)          HT_LEN (&(NODE)->ident)
 474 #define NODE_NAME(NODE)         HT_STR (&(NODE)->ident)
 475
 476 /* The common part of an identifier node shared amongst all 3 C front
 477    ends.  Also used to store CPP identifiers, which are a superset of
 478    identifiers in the grammatical sense.  */
 479 struct cpp_hashnode
 480 {
 481   struct ht_identifier ident;
 482   unsigned short arg_index;             /* Macro argument index.  */
 483   unsigned char directive_index;        /* Index into directive table.  */
 484   unsigned char rid_code;               /* Rid code - for front ends.  */
 485   ENUM_BITFIELD(node_type) type : 8;    /* CPP node type.  */
 486   unsigned char flags;                  /* CPP flags.  */
 487
 488   union
 489   {
 490     cpp_macro *macro;                   /* If a macro.  */
 491     struct answer *answers;             /* Answers to an assertion.  */
 492     enum cpp_ttype operator;            /* Code for a named operator.  */
 493     enum builtin_type builtin;          /* Code for a builtin macro.  */
 494   } value;
 495 };
 496
 497 /* Call this first to get a handle to pass to other functions.  */
 498 extern cpp_reader *cpp_create_reader PARAMS ((enum c_lang));
 499
 500 /* Call these to get pointers to the options and callback structures
 501    for a given reader.  These pointers are good until you call
 502    cpp_finish on that reader.  You can either edit the callbacks
 503    through the pointer returned from cpp_get_callbacks, or set them
 504    with cpp_set_callbacks.  */
 505 extern cpp_options *cpp_get_options PARAMS ((cpp_reader *));
 506 extern const struct line_maps *cpp_get_line_maps PARAMS ((cpp_reader *));
 507 extern cpp_callbacks *cpp_get_callbacks PARAMS ((cpp_reader *));
 508 extern void cpp_set_callbacks PARAMS ((cpp_reader *, cpp_callbacks *));
 509
 510 /* Now call cpp_handle_option[s] to handle 1[or more] switches.  The
 511    return value is the number of arguments used.  If
 512    cpp_handle_options returns without using all arguments, it couldn't
 513    understand the next switch.  When there are no switches left, you
 514    must call cpp_post_options before calling cpp_read_main_file.  Only
 515    after cpp_post_options are the contents of the cpp_options
 516    structure reliable.  Options processing is not completed until you
 517    call cpp_finish_options.  */
 518 extern int cpp_handle_options PARAMS ((cpp_reader *, int, char **));
 519 extern int cpp_handle_option PARAMS ((cpp_reader *, int, char **, int));
 520 extern void cpp_post_options PARAMS ((cpp_reader *));
 521
 522 /* This function reads the file, but does not start preprocessing.  It
 523    returns the name of the original file; this is the same as the
 524    input file, except for preprocessed input.  This will generate at
 525    least one file change callback, and possibly a line change callback
 526    too.  If there was an error opening the file, it returns NULL.
 527
 528    If you want cpplib to manage its own hashtable, pass in a NULL
 529    pointer.  Otherise you should pass in an initialised hash table
 530    that cpplib will share; this technique is used by the C front
 531    ends.  */
 532 extern const char *cpp_read_main_file PARAMS ((cpp_reader *, const char *,
 533                                                struct ht *));
 534
 535 /* Deferred handling of command line options that can generate debug
 536    callbacks, such as -D and -imacros.  Call this after
 537    cpp_read_main_file.  The front ends need this separation so they
 538    can initialize debug output with the original file name, returned
 539    from cpp_read_main_file, before they get debug callbacks.  */
 540 extern void cpp_finish_options PARAMS ((cpp_reader *));
 541
 542 /* Call this to release the handle at the end of preprocessing.  Any
 543    use of the handle after this function returns is invalid.  Returns
 544    cpp_errors (pfile).  */
 545 extern int cpp_destroy PARAMS ((cpp_reader *));
 546
 547 /* Error count.  */
 548 extern unsigned int cpp_errors PARAMS ((cpp_reader *));
 549
 550 extern unsigned int cpp_token_len PARAMS ((const cpp_token *));
 551 extern unsigned char *cpp_token_as_text PARAMS ((cpp_reader *,
 552                                                  const cpp_token *));
 553 extern unsigned char *cpp_spell_token PARAMS ((cpp_reader *, const cpp_token *,
 554                                                unsigned char *));
 555 extern void cpp_register_pragma PARAMS ((cpp_reader *,
 556                                          const char *, const char *,
 557                                          void (*) PARAMS ((cpp_reader *))));
 558
 559 extern void cpp_finish PARAMS ((cpp_reader *));
 560 extern int cpp_avoid_paste PARAMS ((cpp_reader *, const cpp_token *,
 561                                     const cpp_token *));
 562 extern const cpp_token *cpp_get_token PARAMS ((cpp_reader *));
 563 extern const unsigned char *cpp_macro_definition PARAMS ((cpp_reader *,
 564                                                   const cpp_hashnode *));
 565 extern void _cpp_backup_tokens PARAMS ((cpp_reader *, unsigned int));
 566
 567 /* Evaluate a CPP_CHAR or CPP_WCHAR token.  */
 568 extern cppchar_t
 569 cpp_interpret_charconst PARAMS ((cpp_reader *, const cpp_token *,
 570                                  unsigned int *, int *));
 571
 572 /* Used to register builtins during the register_builtins callback.
 573    The text is the same as the command line argument.  */
 574 extern void cpp_define PARAMS ((cpp_reader *, const char *));
 575 extern void cpp_assert PARAMS ((cpp_reader *, const char *));
 576 extern void cpp_undef  PARAMS ((cpp_reader *, const char *));
 577 extern void cpp_unassert PARAMS ((cpp_reader *, const char *));
 578
 579 extern cpp_buffer *cpp_push_buffer PARAMS ((cpp_reader *,
 580                                             const unsigned char *, size_t,
 581                                             int, int));
 582 extern int cpp_defined PARAMS ((cpp_reader *, const unsigned char *, int));
 583
 584 /* Diagnostic levels.  To get a dianostic without associating a
 585    position in the translation unit with it, use cpp_error_with_line
 586    with a line number of zero.  */
 587
 588 /* Warning, an error with -Werror.  */
 589 #define DL_WARNING              0x00
 590 /* Same as DL_WARNING, except it is not suppressed in system headers.  */
 591 #define DL_WARNING_SYSHDR       0x01
 592 /* Warning, an error with -pedantic-errors or -Werror.  */
 593 #define DL_PEDWARN              0x02
 594 /* An error.  */
 595 #define DL_ERROR                0x03
 596 /* A fatal error.  We do not exit, to support use of cpplib as a
 597    library, but may only return CPP_EOF tokens thereon.  It is the
 598    caller's responsibility to check CPP_FATAL_ERRORS.  */
 599 #define DL_FATAL                0x04
 600 /* An internal consistency check failed.  Prints "internal error: ",
 601    otherwise the same as DL_FATAL.  */
 602 #define DL_ICE                  0x05
 603 /* Extracts a diagnostic level from an int.  */
 604 #define DL_EXTRACT(l)           (l & 0xf)
 605 /* Non-zero if a diagnostic level is one of the warnings.  */
 606 #define DL_WARNING_P(l)         (DL_EXTRACT (l) >= DL_WARNING \
 607                                  && DL_EXTRACT (l) <= DL_PEDWARN)
 608
 609 /* N.B. The error-message-printer prototypes have not been nicely
 610    formatted because exgettext needs to see 'msgid' on the same line
 611    as the name of the function in order to work properly.  Only the
 612    string argument gets a name in an effort to keep the lines from
 613    getting ridiculously oversized.  */
 614
 615 /* Output a diagnostic of some kind.  */
 616 extern void cpp_error PARAMS ((cpp_reader *, int, const char *msgid, ...))
 617   ATTRIBUTE_PRINTF_3;
 618
 619 /* Output a diagnostic of severity LEVEL, with "MSG: " preceding the
 620    error string of errno.  No location is printed.  */
 621 extern void cpp_errno PARAMS ((cpp_reader *, int level, const char *msg));
 622
 623 /* Same as cpp_error, except additionally specifies a position as a
 624    (translation unit) physical line and physical column.  If the line is
 625    zero, then no location is printed.  */
 626 extern void cpp_error_with_line PARAMS ((cpp_reader *, int, unsigned, unsigned, const char *msgid, ...))
 627   ATTRIBUTE_PRINTF_5;
 628
 629 /* In cpplex.c */
 630 extern int cpp_ideq                     PARAMS ((const cpp_token *,
 631                                                  const char *));
 632 extern void cpp_output_line             PARAMS ((cpp_reader *, FILE *));
 633 extern void cpp_output_token            PARAMS ((const cpp_token *, FILE *));
 634 extern const char *cpp_type2name        PARAMS ((enum cpp_ttype));
 635 /* Returns the value of an escape sequence, truncated to the correct
 636    target precision.  PSTR points to the input pointer, which is just
 637    after the backslash.  LIMIT is how much text we have.  WIDE is true
 638    if the escape sequence is part of a wide character constant or
 639    string literal.  Handles all relevant diagnostics.  */
 640 extern cppchar_t cpp_parse_escape       PARAMS ((cpp_reader *,
 641                                                  const unsigned char ** pstr,
 642                                                  const unsigned char *limit,
 643                                                  int wide));
 644
 645 /* In cpphash.c */
 646
 647 /* Lookup an identifier in the hashtable.  Puts the identifier in the
 648    table if it is not already there.  */
 649 extern cpp_hashnode *cpp_lookup         PARAMS ((cpp_reader *,
 650                                                  const unsigned char *,
 651                                                  unsigned int));
 652
 653 typedef int (*cpp_cb) PARAMS ((cpp_reader *, cpp_hashnode *, void *));
 654 extern void cpp_forall_identifiers      PARAMS ((cpp_reader *,
 655                                                  cpp_cb, void *));
 656
 657 /* In cppmacro.c */
 658 extern void cpp_scan_nooutput           PARAMS ((cpp_reader *));
 659 extern int  cpp_sys_macro_p             PARAMS ((cpp_reader *));
 660 extern unsigned char *cpp_quote_string  PARAMS ((unsigned char *,
 661                                                  const unsigned char *,
 662                                                  unsigned int));
 663
 664 /* In cppfiles.c */
 665 extern int cpp_included PARAMS ((cpp_reader *, const char *));
 666 extern void cpp_make_system_header PARAMS ((cpp_reader *, int, int));
 667
 668 /* In cppmain.c */
 669 extern void cpp_preprocess_file PARAMS ((cpp_reader *));
 670
 671 #ifdef __cplusplus
 672 }
 673 #endif
 674
 675 #endif /* ! GCC_CPPLIB_H */