gcc/cpplib.h

   1 /* Definitions for CPP library.
   2    Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
   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 typedef struct cpp_reader cpp_reader;
  35 typedef struct cpp_buffer cpp_buffer;
  36 typedef struct cpp_options cpp_options;
  37 typedef struct cpp_token cpp_token;
  38 typedef struct cpp_string cpp_string;
  39 typedef struct cpp_hashnode cpp_hashnode;
  40 typedef struct cpp_macro cpp_macro;
  41 typedef struct cpp_callbacks cpp_callbacks;
  42 typedef struct cpp_dir cpp_dir;
  43
  44 struct answer;
  45
  46 /* The first three groups, apart from '=', can appear in preprocessor
  47    expressions (+= and -= are used to indicate unary + and - resp.).
  48    This allows a lookup table to be implemented in _cpp_parse_expr.
  49
  50    The first group, to CPP_LAST_EQ, can be immediately followed by an
  51    '='.  The lexer needs operators ending in '=', like ">>=", to be in
  52    the same order as their counterparts without the '=', like ">>".  */
  53
  54 /* Positions in the table.  */
  55 #define CPP_LAST_EQ CPP_MAX
  56 #define CPP_FIRST_DIGRAPH CPP_HASH
  57 #define CPP_LAST_PUNCTUATOR CPP_DOT_STAR
  58 #define CPP_LAST_CPP_OP CPP_LESS_EQ
  59
  60 #define TTYPE_TABLE                             \
  61   OP(CPP_EQ = 0,        "=")                    \
  62   OP(CPP_NOT,           "!")                    \
  63   OP(CPP_GREATER,       ">")    /* compare */   \
  64   OP(CPP_LESS,          "<")                    \
  65   OP(CPP_PLUS,          "+")    /* math */      \
  66   OP(CPP_MINUS,         "-")                    \
  67   OP(CPP_MULT,          "*")                    \
  68   OP(CPP_DIV,           "/")                    \
  69   OP(CPP_MOD,           "%")                    \
  70   OP(CPP_AND,           "&")    /* bit ops */   \
  71   OP(CPP_OR,            "|")                    \
  72   OP(CPP_XOR,           "^")                    \
  73   OP(CPP_RSHIFT,        ">>")                   \
  74   OP(CPP_LSHIFT,        "<<")                   \
  75   OP(CPP_MIN,           "<?")   /* extension */ \
  76   OP(CPP_MAX,           ">?")                   \
  77 \
  78   OP(CPP_COMPL,         "~")                    \
  79   OP(CPP_AND_AND,       "&&")   /* logical */   \
  80   OP(CPP_OR_OR,         "||")                   \
  81   OP(CPP_QUERY,         "?")                    \
  82   OP(CPP_COLON,         ":")                    \
  83   OP(CPP_COMMA,         ",")    /* grouping */  \
  84   OP(CPP_OPEN_PAREN,    "(")                    \
  85   OP(CPP_CLOSE_PAREN,   ")")                    \
  86   TK(CPP_EOF,           SPELL_NONE)             \
  87   OP(CPP_EQ_EQ,         "==")   /* compare */   \
  88   OP(CPP_NOT_EQ,        "!=")                   \
  89   OP(CPP_GREATER_EQ,    ">=")                   \
  90   OP(CPP_LESS_EQ,       "<=")                   \
  91 \
  92   /* These two are unary + / - in preprocessor expressions.  */ \
  93   OP(CPP_PLUS_EQ,       "+=")   /* math */      \
  94   OP(CPP_MINUS_EQ,      "-=")                   \
  95 \
  96   OP(CPP_MULT_EQ,       "*=")                   \
  97   OP(CPP_DIV_EQ,        "/=")                   \
  98   OP(CPP_MOD_EQ,        "%=")                   \
  99   OP(CPP_AND_EQ,        "&=")   /* bit ops */   \
 100   OP(CPP_OR_EQ,         "|=")                   \
 101   OP(CPP_XOR_EQ,        "^=")                   \
 102   OP(CPP_RSHIFT_EQ,     ">>=")                  \
 103   OP(CPP_LSHIFT_EQ,     "<<=")                  \
 104   OP(CPP_MIN_EQ,        "<?=")  /* extension */ \
 105   OP(CPP_MAX_EQ,        ">?=")                  \
 106   /* Digraphs together, beginning with CPP_FIRST_DIGRAPH.  */   \
 107   OP(CPP_HASH,          "#")    /* digraphs */  \
 108   OP(CPP_PASTE,         "##")                   \
 109   OP(CPP_OPEN_SQUARE,   "[")                    \
 110   OP(CPP_CLOSE_SQUARE,  "]")                    \
 111   OP(CPP_OPEN_BRACE,    "{")                    \
 112   OP(CPP_CLOSE_BRACE,   "}")                    \
 113   /* The remainder of the punctuation.  Order is not significant.  */   \
 114   OP(CPP_SEMICOLON,     ";")    /* structure */ \
 115   OP(CPP_ELLIPSIS,      "...")                  \
 116   OP(CPP_PLUS_PLUS,     "++")   /* increment */ \
 117   OP(CPP_MINUS_MINUS,   "--")                   \
 118   OP(CPP_DEREF,         "->")   /* accessors */ \
 119   OP(CPP_DOT,           ".")                    \
 120   OP(CPP_SCOPE,         "::")                   \
 121   OP(CPP_DEREF_STAR,    "->*")                  \
 122   OP(CPP_DOT_STAR,      ".*")                   \
 123   OP(CPP_ATSIGN,        "@")  /* used in Objective-C */ \
 124 \
 125   TK(CPP_NAME,          SPELL_IDENT)    /* word */                      \
 126   TK(CPP_AT_NAME,       SPELL_IDENT)    /* @word - Objective-C */       \
 127   TK(CPP_NUMBER,        SPELL_LITERAL)  /* 34_be+ta  */                 \
 128 \
 129   TK(CPP_CHAR,          SPELL_LITERAL)  /* 'char' */                    \
 130   TK(CPP_WCHAR,         SPELL_LITERAL)  /* L'char' */                   \
 131   TK(CPP_OTHER,         SPELL_LITERAL)  /* stray punctuation */         \
 132 \
 133   TK(CPP_STRING,        SPELL_LITERAL)  /* "string" */                  \
 134   TK(CPP_WSTRING,       SPELL_LITERAL)  /* L"string" */                 \
 135   TK(CPP_OBJC_STRING,   SPELL_LITERAL)  /* @"string" - Objective-C */   \
 136   TK(CPP_HEADER_NAME,   SPELL_LITERAL)  /* <stdio.h> in #include */     \
 137 \
 138   TK(CPP_COMMENT,       SPELL_LITERAL)  /* Only if output comments.  */ \
 139                                         /* SPELL_LITERAL happens to DTRT.  */ \
 140   TK(CPP_MACRO_ARG,     SPELL_NONE)     /* Macro argument.  */          \
 141   TK(CPP_PADDING,       SPELL_NONE)     /* Whitespace for cpp0.  */
 142
 143 #define OP(e, s) e,
 144 #define TK(e, s) e,
 145 enum cpp_ttype
 146 {
 147   TTYPE_TABLE
 148   N_TTYPES
 149 };
 150 #undef OP
 151 #undef TK
 152
 153 /* C language kind, used when calling cpp_reader_init.  */
 154 enum c_lang {CLK_GNUC89 = 0, CLK_GNUC99, CLK_STDC89, CLK_STDC94, CLK_STDC99,
 155              CLK_GNUCXX, CLK_CXX98, CLK_ASM};
 156
 157 /* Payload of a NUMBER, STRING, CHAR or COMMENT token.  */
 158 struct cpp_string
 159 {
 160   unsigned int len;
 161   const unsigned char *text;
 162 };
 163
 164 /* Flags for the cpp_token structure.  */
 165 #define PREV_WHITE      (1 << 0) /* If whitespace before this token.  */
 166 #define DIGRAPH         (1 << 1) /* If it was a digraph.  */
 167 #define STRINGIFY_ARG   (1 << 2) /* If macro argument to be stringified.  */
 168 #define PASTE_LEFT      (1 << 3) /* If on LHS of a ## operator.  */
 169 #define NAMED_OP        (1 << 4) /* C++ named operators.  */
 170 #define NO_EXPAND       (1 << 5) /* Do not macro-expand this token.  */
 171 #define BOL             (1 << 6) /* Token at beginning of line.  */
 172
 173 /* A preprocessing token.  This has been carefully packed and should
 174    occupy 16 bytes on 32-bit hosts and 24 bytes on 64-bit hosts.  */
 175 struct cpp_token
 176 {
 177   fileline line;                /* Logical line of first char of token.  */
 178   unsigned short col;           /* Column of first char of token.  */
 179   ENUM_BITFIELD(cpp_ttype) type : CHAR_BIT;  /* token type */
 180   unsigned char flags;          /* flags - see above */
 181
 182   union
 183   {
 184     cpp_hashnode *node;         /* An identifier.  */
 185     const cpp_token *source;    /* Inherit padding from this token.  */
 186     struct cpp_string str;      /* A string, or number.  */
 187     unsigned int arg_no;        /* Argument no. for a CPP_MACRO_ARG.  */
 188   } val;
 189 };
 190
 191 /* A type wide enough to hold any multibyte source character.
 192    cpplib's character constant interpreter requires an unsigned type.
 193    Also, a typedef for the signed equivalent.
 194    The width of this type is capped at 32 bits; there do exist targets
 195    where wchar_t is 64 bits, but only in a non-default mode, and there
 196    would be no meaningful interpretation for a wchar_t value greater
 197    than 2^32 anyway -- the widest wide-character encoding around is
 198    ISO 10646, which stops at 2^31.  */
 199 #if CHAR_BIT * SIZEOF_INT >= 32
 200 # define CPPCHAR_SIGNED_T int
 201 #elif CHAR_BIT * SIZEOF_LONG >= 32
 202 # define CPPCHAR_SIGNED_T long
 203 #else
 204 # error "Cannot find a least-32-bit signed integer type"
 205 #endif
 206 typedef unsigned CPPCHAR_SIGNED_T cppchar_t;
 207 typedef CPPCHAR_SIGNED_T cppchar_signed_t;
 208
 209 /* This structure is nested inside struct cpp_reader, and
 210    carries all the options visible to the command line.  */
 211 struct cpp_options
 212 {
 213   /* Characters between tab stops.  */
 214   unsigned int tabstop;
 215
 216   /* The language we're preprocessing.  */
 217   enum c_lang lang;
 218
 219   /* Nonzero means use extra default include directories for C++.  */
 220   unsigned char cplusplus;
 221
 222   /* Nonzero means handle cplusplus style comments */
 223   unsigned char cplusplus_comments;
 224
 225   /* Nonzero means define __OBJC__, treat @ as a special token, and
 226      use the OBJC[PLUS]_INCLUDE_PATH environment variable.  */
 227   unsigned char objc;
 228
 229   /* Nonzero means don't copy comments into the output file.  */
 230   unsigned char discard_comments;
 231
 232   /* Nonzero means don't copy comments into the output file during
 233      macro expansion.  */
 234   unsigned char discard_comments_in_macro_exp;
 235
 236   /* Nonzero means process the ISO trigraph sequences.  */
 237   unsigned char trigraphs;
 238
 239   /* Nonzero means process the ISO digraph sequences.  */
 240   unsigned char digraphs;
 241
 242   /* Nonzero means to allow hexadecimal floats and LL suffixes.  */
 243   unsigned char extended_numbers;
 244
 245   /* Nonzero means print names of header files (-H).  */
 246   unsigned char print_include_names;
 247
 248   /* Nonzero means cpp_pedwarn causes a hard error.  */
 249   unsigned char pedantic_errors;
 250
 251   /* Nonzero means don't print warning messages.  */
 252   unsigned char inhibit_warnings;
 253
 254   /* Nonzero means complain about deprecated features.  */
 255   unsigned char warn_deprecated;
 256
 257   /* Nonzero means don't suppress warnings from system headers.  */
 258   unsigned char warn_system_headers;
 259
 260   /* Nonzero means don't print error messages.  Has no option to
 261      select it, but can be set by a user of cpplib (e.g. fix-header).  */
 262   unsigned char inhibit_errors;
 263
 264   /* Nonzero means warn if slash-star appears in a comment.  */
 265   unsigned char warn_comments;
 266
 267   /* Nonzero means warn if there are any trigraphs.  */
 268   unsigned char warn_trigraphs;
 269
 270   /* Nonzero means warn about multicharacter charconsts.  */
 271   unsigned char warn_multichar;
 272
 273   /* Nonzero means warn about various incompatibilities with
 274      traditional C.  */
 275   unsigned char warn_traditional;
 276
 277   /* Nonzero means warn about long long numeric constants.  */
 278   unsigned char warn_long_long;
 279
 280   /* Nonzero means warn about text after an #endif (or #else).  */
 281   unsigned char warn_endif_labels;
 282
 283   /* Nonzero means warn about implicit sign changes owing to integer
 284      promotions.  */
 285   unsigned char warn_num_sign_change;
 286
 287   /* Nonzero means turn warnings into errors.  */
 288   unsigned char warnings_are_errors;
 289
 290   /* Nonzero means we should look for header.gcc files that remap file
 291      names.  */
 292   unsigned char remap;
 293
 294   /* Zero means dollar signs are punctuation.  */
 295   unsigned char dollars_in_ident;
 296
 297   /* True if we should warn about dollars in identifiers or numbers
 298      for this translation unit.  */
 299   unsigned char warn_dollars;
 300
 301   /* Nonzero means warn if undefined identifiers are evaluated in an #if.  */
 302   unsigned char warn_undef;
 303
 304   /* Nonzero means warn of unused macros from the main file.  */
 305   unsigned char warn_unused_macros;
 306
 307   /* Nonzero for the 1999 C Standard, including corrigenda and amendments.  */
 308   unsigned char c99;
 309
 310   /* Nonzero if we are conforming to a specific C or C++ standard.  */
 311   unsigned char std;
 312
 313   /* Nonzero means give all the error messages the ANSI standard requires.  */
 314   unsigned char pedantic;
 315
 316   /* Nonzero means we're looking at already preprocessed code, so don't
 317      bother trying to do macro expansion and whatnot.  */
 318   unsigned char preprocessed;
 319
 320   /* Print column number in error messages.  */
 321   unsigned char show_column;
 322
 323   /* Nonzero means handle C++ alternate operator names.  */
 324   unsigned char operator_names;
 325
 326   /* True for traditional preprocessing.  */
 327   unsigned char traditional;
 328
 329   /* Holds the name of the target (execution) character set.  */
 330   const char *narrow_charset;
 331
 332   /* Holds the name of the target wide character set.  */
 333   const char *wide_charset;
 334
 335   /* True to warn about precompiled header files we couldn't use.  */
 336   bool warn_invalid_pch;
 337
 338   /* True if dependencies should be restored from a precompiled header.  */
 339   bool restore_pch_deps;
 340
 341   /* Dependency generation.  */
 342   struct
 343   {
 344     /* Style of header dependencies to generate.  */
 345     enum {DEPS_NONE = 0, DEPS_USER, DEPS_SYSTEM } style;
 346
 347     /* Assume missing files are generated files.  */
 348     bool missing_files;
 349
 350     /* Generate phony targets for each dependency apart from the first
 351        one.  */
 352     bool phony_targets;
 353
 354     /* If true, no dependency is generated on the main file.  */
 355     bool ignore_main_file;
 356   } deps;
 357
 358   /* Target-specific features set by the front end or client.  */
 359
 360   /* Precision for target CPP arithmetic, target characters, target
 361      ints and target wide characters, respectively.  */
 362   size_t precision, char_precision, int_precision, wchar_precision;
 363
 364   /* True means chars (wide chars) are unsigned.  */
 365   bool unsigned_char, unsigned_wchar;
 366
 367   /* True if the most significant byte in a word has the lowest
 368      address in memory.  */
 369   bool bytes_big_endian;
 370
 371   /* Nonzero means __STDC__ should have the value 0 in system headers.  */
 372   unsigned char stdc_0_in_system_headers;
 373
 374   /* Nonzero means output a directory line marker right after the
 375      initial file name line marker, and before a duplicate initial
 376      line marker.  */
 377   bool working_directory;
 378 };
 379
 380 /* Call backs to cpplib client.  */
 381 struct cpp_callbacks
 382 {
 383   /* Called when a new line of preprocessed output is started.  */
 384   void (*line_change) (cpp_reader *, const cpp_token *, int);
 385   void (*file_change) (cpp_reader *, const struct line_map *);
 386   void (*dir_change) (cpp_reader *, const char *);
 387   void (*include) (cpp_reader *, unsigned int, const unsigned char *,
 388                    const char *, int);
 389   void (*define) (cpp_reader *, unsigned int, cpp_hashnode *);
 390   void (*undef) (cpp_reader *, unsigned int, cpp_hashnode *);
 391   void (*ident) (cpp_reader *, unsigned int, const cpp_string *);
 392   void (*def_pragma) (cpp_reader *, unsigned int);
 393   int (*valid_pch) (cpp_reader *, const char *, int);
 394   void (*read_pch) (cpp_reader *, const char *, int, const char *);
 395 };
 396
 397 /* Chain of directories to look for include files in.  */
 398 struct cpp_dir
 399 {
 400   /* NULL-terminated singly-linked list.  */
 401   struct cpp_dir *next;
 402
 403   /* NAME of the directory, NUL-terminated.  */
 404   char *name;
 405   unsigned int len;
 406
 407   /* One if a system header, two if a system header that has extern
 408      "C" guards for C++.  */
 409   unsigned char sysp;
 410
 411   /* Mapping of file names for this directory for MS-DOS and related
 412      platforms.  A NULL-terminated array of (from, to) pairs.  */
 413   const char **name_map;
 414
 415   /* The C front end uses these to recognize duplicated
 416      directories in the search path.  */
 417   ino_t ino;
 418   dev_t dev;
 419 };
 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.  Poisoned 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 #define NODE_MACRO_ARG  (1 << 6)        /* Used during #define processing.  */
 443
 444 /* Different flavors of hash node.  */
 445 enum node_type
 446 {
 447   NT_VOID = 0,     /* No definition yet.  */
 448   NT_MACRO,        /* A macro of some form.  */
 449   NT_ASSERTION     /* Predicate for #assert.  */
 450 };
 451
 452 /* Different flavors of builtin macro.  _Pragma is an operator, but we
 453    handle it with the builtin code for efficiency reasons.  */
 454 enum builtin_type
 455 {
 456   BT_SPECLINE = 0,              /* `__LINE__' */
 457   BT_DATE,                      /* `__DATE__' */
 458   BT_FILE,                      /* `__FILE__' */
 459   BT_BASE_FILE,                 /* `__BASE_FILE__' */
 460   BT_INCLUDE_LEVEL,             /* `__INCLUDE_LEVEL__' */
 461   BT_TIME,                      /* `__TIME__' */
 462   BT_STDC,                      /* `__STDC__' */
 463   BT_PRAGMA                     /* `_Pragma' operator */
 464 };
 465
 466 #define CPP_HASHNODE(HNODE)     ((cpp_hashnode *) (HNODE))
 467 #define HT_NODE(NODE)           ((ht_identifier *) (NODE))
 468 #define NODE_LEN(NODE)          HT_LEN (&(NODE)->ident)
 469 #define NODE_NAME(NODE)         HT_STR (&(NODE)->ident)
 470
 471 /* The common part of an identifier node shared amongst all 3 C front
 472    ends.  Also used to store CPP identifiers, which are a superset of
 473    identifiers in the grammatical sense.  */
 474 struct cpp_hashnode GTY(())
 475 {
 476   struct ht_identifier ident;
 477   unsigned int is_directive : 1;
 478   unsigned int directive_index : 7;     /* If is_directive,
 479                                            then index into directive table.
 480                                            Otherwise, a NODE_OPERATOR.  */
 481   unsigned char rid_code;               /* Rid code - for front ends.  */
 482   ENUM_BITFIELD(node_type) type : 8;    /* CPP node type.  */
 483   unsigned char flags;                  /* CPP flags.  */
 484
 485   union _cpp_hashnode_value
 486   {
 487     /* If a macro.  */
 488     cpp_macro * GTY((skip (""))) macro;
 489     /* Answers to an assertion.  */
 490     struct answer * GTY ((skip (""))) answers;
 491     /* Code for a builtin macro.  */
 492     enum builtin_type GTY ((tag ("1"))) builtin;
 493     /* Macro argument index.  */
 494     unsigned short GTY ((tag ("0"))) arg_index;
 495   } GTY ((desc ("0"))) value;
 496 };
 497
 498 /* Call this first to get a handle to pass to other functions.
 499
 500    If you want cpplib to manage its own hashtable, pass in a NULL
 501    pointer.  Otherwise you should pass in an initialized hash table
 502    that cpplib will share; this technique is used by the C front
 503    ends.  */
 504 extern cpp_reader *cpp_create_reader (enum c_lang, struct ht *);
 505
 506 /* Call this to change the selected language standard (e.g. because of
 507    command line options).  */
 508 extern void cpp_set_lang (cpp_reader *, enum c_lang);
 509
 510 /* Add a dependency TARGET.  Quote it for "make" if QUOTE.  Can be
 511    called any number of times before cpp_read_main_file().  If no
 512    targets have been added before cpp_read_main_file(), then the
 513    default target is used.  */
 514 extern void cpp_add_dependency_target (cpp_reader *, const char *, int);
 515
 516 /* Set the include paths.  */
 517 extern void cpp_set_include_chains (cpp_reader *, cpp_dir *, cpp_dir *, int);
 518
 519 /* Call these to get pointers to the options and callback structures
 520    for a given reader.  These pointers are good until you call
 521    cpp_finish on that reader.  You can either edit the callbacks
 522    through the pointer returned from cpp_get_callbacks, or set them
 523    with cpp_set_callbacks.  */
 524 extern cpp_options *cpp_get_options (cpp_reader *);
 525 extern const struct line_maps *cpp_get_line_maps (cpp_reader *);
 526 extern cpp_callbacks *cpp_get_callbacks (cpp_reader *);
 527 extern void cpp_set_callbacks (cpp_reader *, cpp_callbacks *);
 528
 529 /* This function reads the file, but does not start preprocessing.  It
 530    returns the name of the original file; this is the same as the
 531    input file, except for preprocessed input.  This will generate at
 532    least one file change callback, and possibly a line change callback
 533    too.  If there was an error opening the file, it returns NULL.  */
 534 extern const char *cpp_read_main_file (cpp_reader *, const char *);
 535
 536 /* Set up built-ins like __FILE__.  */
 537 extern void cpp_init_builtins (cpp_reader *, int);
 538
 539 /* This is called after options have been parsed, and partially
 540    processed.  */
 541 extern void cpp_post_options (cpp_reader *);
 542
 543 /* Set up translation to the target character set.  */
 544 extern void cpp_init_iconv (cpp_reader *);
 545
 546 /* Call this to finish preprocessing.  If you requested dependency
 547    generation, pass an open stream to write the information to,
 548    otherwise NULL.  It is your responsibility to close the stream.
 549
 550    Returns cpp_errors (pfile).  */
 551 extern int cpp_finish (cpp_reader *, FILE *deps_stream);
 552
 553 /* Call this to release the handle at the end of preprocessing.  Any
 554    use of the handle after this function returns is invalid.  Returns
 555    cpp_errors (pfile).  */
 556 extern void cpp_destroy (cpp_reader *);
 557
 558 /* Error count.  */
 559 extern unsigned int cpp_errors (cpp_reader *);
 560
 561 extern unsigned int cpp_token_len (const cpp_token *);
 562 extern unsigned char *cpp_token_as_text (cpp_reader *, const cpp_token *);
 563 extern unsigned char *cpp_spell_token (cpp_reader *, const cpp_token *,
 564                                        unsigned char *);
 565 extern void cpp_register_pragma (cpp_reader *, const char *, const char *,
 566                                  void (*) (cpp_reader *));
 567 extern int cpp_avoid_paste (cpp_reader *, const cpp_token *,
 568                             const cpp_token *);
 569 extern const cpp_token *cpp_get_token (cpp_reader *);
 570 extern const unsigned char *cpp_macro_definition (cpp_reader *,
 571                                                   const cpp_hashnode *);
 572 extern void _cpp_backup_tokens (cpp_reader *, unsigned int);
 573
 574 /* Evaluate a CPP_CHAR or CPP_WCHAR token.  */
 575 extern cppchar_t cpp_interpret_charconst (cpp_reader *, const cpp_token *,
 576                                           unsigned int *, int *);
 577 /* Evaluate a vector of CPP_STRING or CPP_WSTRING tokens.  */
 578 extern bool cpp_interpret_string (cpp_reader *,
 579                                   const cpp_string *, size_t,
 580                                   cpp_string *, bool);
 581
 582 /* Used to register macros and assertions, perhaps from the command line.
 583    The text is the same as the command line argument.  */
 584 extern void cpp_define (cpp_reader *, const char *);
 585 extern void cpp_assert (cpp_reader *, const char *);
 586 extern void cpp_undef (cpp_reader *, const char *);
 587 extern void cpp_unassert (cpp_reader *, const char *);
 588
 589 /* Undefine all macros and assertions.  */
 590 extern void cpp_undef_all (cpp_reader *);
 591
 592 extern cpp_buffer *cpp_push_buffer (cpp_reader *, const unsigned char *,
 593                                     size_t, int, int);
 594 extern int cpp_defined (cpp_reader *, const unsigned char *, int);
 595
 596 /* A preprocessing number.  Code assumes that any unused high bits of
 597    the double integer are set to zero.  */
 598 typedef unsigned HOST_WIDE_INT cpp_num_part;
 599 typedef struct cpp_num cpp_num;
 600 struct cpp_num
 601 {
 602   cpp_num_part high;
 603   cpp_num_part low;
 604   bool unsignedp;  /* True if value should be treated as unsigned.  */
 605   bool overflow;   /* True if the most recent calculation overflowed.  */
 606 };
 607
 608 /* cpplib provides two interfaces for interpretation of preprocessing
 609    numbers.
 610
 611    cpp_classify_number categorizes numeric constants according to
 612    their field (integer, floating point, or invalid), radix (decimal,
 613    octal, hexadecimal), and type suffixes.  */
 614
 615 #define CPP_N_CATEGORY  0x000F
 616 #define CPP_N_INVALID   0x0000
 617 #define CPP_N_INTEGER   0x0001
 618 #define CPP_N_FLOATING  0x0002
 619
 620 #define CPP_N_WIDTH     0x00F0
 621 #define CPP_N_SMALL     0x0010  /* int, float.  */
 622 #define CPP_N_MEDIUM    0x0020  /* long, double.  */
 623 #define CPP_N_LARGE     0x0040  /* long long, long double.  */
 624
 625 #define CPP_N_RADIX     0x0F00
 626 #define CPP_N_DECIMAL   0x0100
 627 #define CPP_N_HEX       0x0200
 628 #define CPP_N_OCTAL     0x0400
 629
 630 #define CPP_N_UNSIGNED  0x1000  /* Properties.  */
 631 #define CPP_N_IMAGINARY 0x2000
 632
 633 /* Classify a CPP_NUMBER token.  The return value is a combination of
 634    the flags from the above sets.  */
 635 extern unsigned cpp_classify_number (cpp_reader *, const cpp_token *);
 636
 637 /* Evaluate a token classified as category CPP_N_INTEGER.  */
 638 extern cpp_num cpp_interpret_integer (cpp_reader *, const cpp_token *,
 639                                       unsigned int type);
 640
 641 /* Sign extend a number, with PRECISION significant bits and all
 642    others assumed clear, to fill out a cpp_num structure.  */
 643 cpp_num cpp_num_sign_extend (cpp_num, size_t);
 644
 645 /* Diagnostic levels.  To get a diagnostic without associating a
 646    position in the translation unit with it, use cpp_error_with_line
 647    with a line number of zero.  */
 648
 649 /* Warning, an error with -Werror.  */
 650 #define DL_WARNING              0x00
 651 /* Same as DL_WARNING, except it is not suppressed in system headers.  */
 652 #define DL_WARNING_SYSHDR       0x01
 653 /* Warning, an error with -pedantic-errors or -Werror.  */
 654 #define DL_PEDWARN              0x02
 655 /* An error.  */
 656 #define DL_ERROR                0x03
 657 /* An internal consistency check failed.  Prints "internal error: ",
 658    otherwise the same as DL_ERROR.  */
 659 #define DL_ICE                  0x04
 660 /* Extracts a diagnostic level from an int.  */
 661 #define DL_EXTRACT(l)           (l & 0xf)
 662 /* Nonzero if a diagnostic level is one of the warnings.  */
 663 #define DL_WARNING_P(l)         (DL_EXTRACT (l) >= DL_WARNING \
 664                                  && DL_EXTRACT (l) <= DL_PEDWARN)
 665
 666 /* N.B. The error-message-printer prototypes have not been nicely
 667    formatted because exgettext needs to see 'msgid' on the same line
 668    as the name of the function in order to work properly.  Only the
 669    string argument gets a name in an effort to keep the lines from
 670    getting ridiculously oversized.  */
 671
 672 /* Output a diagnostic of some kind.  */
 673 extern void cpp_error (cpp_reader *, int, const char *msgid, ...)
 674   ATTRIBUTE_PRINTF_3;
 675
 676 /* Output a diagnostic with "MSGID: " preceding the
 677    error string of errno.  No location is printed.  */
 678 extern void cpp_errno (cpp_reader *, int, const char *msgid);
 679
 680 /* Same as cpp_error, except additionally specifies a position as a
 681    (translation unit) physical line and physical column.  If the line is
 682    zero, then no location is printed.  */
 683 extern void cpp_error_with_line (cpp_reader *, int, fileline, unsigned,
 684                                  const char *msgid, ...) ATTRIBUTE_PRINTF_5;
 685
 686 /* In cpplex.c */
 687 extern int cpp_ideq (const cpp_token *, const char *);
 688 extern void cpp_output_line (cpp_reader *, FILE *);
 689 extern void cpp_output_token (const cpp_token *, FILE *);
 690 extern const char *cpp_type2name (enum cpp_ttype);
 691 /* Returns the value of an escape sequence, truncated to the correct
 692    target precision.  PSTR points to the input pointer, which is just
 693    after the backslash.  LIMIT is how much text we have.  WIDE is true
 694    if the escape sequence is part of a wide character constant or
 695    string literal.  Handles all relevant diagnostics.  */
 696 extern cppchar_t cpp_parse_escape (cpp_reader *, const unsigned char ** pstr,
 697                                    const unsigned char *limit, int wide);
 698
 699 /* In cpphash.c */
 700
 701 /* Lookup an identifier in the hashtable.  Puts the identifier in the
 702    table if it is not already there.  */
 703 extern cpp_hashnode *cpp_lookup (cpp_reader *, const unsigned char *,
 704                                  unsigned int);
 705
 706 typedef int (*cpp_cb) (cpp_reader *, cpp_hashnode *, void *);
 707 extern void cpp_forall_identifiers (cpp_reader *, cpp_cb, void *);
 708
 709 /* In cppmacro.c */
 710 extern void cpp_scan_nooutput (cpp_reader *);
 711 extern int  cpp_sys_macro_p (cpp_reader *);
 712 extern unsigned char *cpp_quote_string (unsigned char *, const unsigned char *,
 713                                         unsigned int);
 714
 715 /* In cppfiles.c */
 716 extern bool cpp_included (cpp_reader *, const char *);
 717 extern void cpp_make_system_header (cpp_reader *, int, int);
 718 extern bool cpp_push_include (cpp_reader *, const char *);
 719 extern void cpp_change_file (cpp_reader *, enum lc_reason, const char *);
 720
 721 /* In cpppch.c */
 722 struct save_macro_data;
 723 extern int cpp_save_state (cpp_reader *, FILE *);
 724 extern int cpp_write_pch_deps (cpp_reader *, FILE *);
 725 extern int cpp_write_pch_state (cpp_reader *, FILE *);
 726 extern int cpp_valid_state (cpp_reader *, const char *, int);
 727 extern void cpp_prepare_state (cpp_reader *, struct save_macro_data **);
 728 extern int cpp_read_state (cpp_reader *, const char *, FILE *,
 729                            struct save_macro_data *);
 730
 731 #ifdef __cplusplus
 732 }
 733 #endif
 734
 735 #endif /* ! GCC_CPPLIB_H */