libcpp/include/cpplib.h

   1 /* Definitions for CPP library.
   2    Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   3    2004, 2005, 2007
   4    Free Software Foundation, Inc.
   5    Written by Per Bothner, 1994-95.
   6
   7 This program is free software; you can redistribute it and/or modify it
   8 under the terms of the GNU General Public License as published by the
   9 Free Software Foundation; either version 2, or (at your option) any
  10 later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20
  21  In other words, you are welcome to use, share and improve this program.
  22  You are forbidden to forbid anyone else to use, share and improve
  23  what you give them.   Help stamp out software-hoarding!  */
  24 #ifndef LIBCPP_CPPLIB_H
  25 #define LIBCPP_CPPLIB_H
  26
  27 #include <sys/types.h>
  28 #include "symtab.h"
  29 #include "line-map.h"
  30
  31 #ifdef __cplusplus
  32 extern "C" {
  33 #endif
  34
  35 typedef struct cpp_reader cpp_reader;
  36 typedef struct cpp_buffer cpp_buffer;
  37 typedef struct cpp_options cpp_options;
  38 typedef struct cpp_token cpp_token;
  39 typedef struct cpp_string cpp_string;
  40 typedef struct cpp_hashnode cpp_hashnode;
  41 typedef struct cpp_macro cpp_macro;
  42 typedef struct cpp_callbacks cpp_callbacks;
  43 typedef struct cpp_dir cpp_dir;
  44
  45 struct answer;
  46 struct _cpp_file;
  47
  48 /* The first three groups, apart from '=', can appear in preprocessor
  49    expressions (+= and -= are used to indicate unary + and - resp.).
  50    This allows a lookup table to be implemented in _cpp_parse_expr.
  51
  52    The first group, to CPP_LAST_EQ, can be immediately followed by an
  53    '='.  The lexer needs operators ending in '=', like ">>=", to be in
  54    the same order as their counterparts without the '=', like ">>".
  55
  56    See the cpp_operator table optab in expr.c if you change the order or
  57    add or remove anything in the first group.  */
  58
  59 #define TTYPE_TABLE                                                     \
  60   OP(EQ,                "=")                                            \
  61   OP(NOT,               "!")                                            \
  62   OP(GREATER,           ">")    /* compare */                           \
  63   OP(LESS,              "<")                                            \
  64   OP(PLUS,              "+")    /* math */                              \
  65   OP(MINUS,             "-")                                            \
  66   OP(MULT,              "*")                                            \
  67   OP(DIV,               "/")                                            \
  68   OP(MOD,               "%")                                            \
  69   OP(AND,               "&")    /* bit ops */                           \
  70   OP(OR,                "|")                                            \
  71   OP(XOR,               "^")                                            \
  72   OP(RSHIFT,            ">>")                                           \
  73   OP(LSHIFT,            "<<")                                           \
  74                                                                         \
  75   OP(COMPL,             "~")                                            \
  76   OP(AND_AND,           "&&")   /* logical */                           \
  77   OP(OR_OR,             "||")                                           \
  78   OP(QUERY,             "?")                                            \
  79   OP(COLON,             ":")                                            \
  80   OP(COMMA,             ",")    /* grouping */                          \
  81   OP(OPEN_PAREN,        "(")                                            \
  82   OP(CLOSE_PAREN,       ")")                                            \
  83   TK(EOF,               NONE)                                           \
  84   OP(EQ_EQ,             "==")   /* compare */                           \
  85   OP(NOT_EQ,            "!=")                                           \
  86   OP(GREATER_EQ,        ">=")                                           \
  87   OP(LESS_EQ,           "<=")                                           \
  88                                                                         \
  89   /* These two are unary + / - in preprocessor expressions.  */         \
  90   OP(PLUS_EQ,           "+=")   /* math */                              \
  91   OP(MINUS_EQ,          "-=")                                           \
  92                                                                         \
  93   OP(MULT_EQ,           "*=")                                           \
  94   OP(DIV_EQ,            "/=")                                           \
  95   OP(MOD_EQ,            "%=")                                           \
  96   OP(AND_EQ,            "&=")   /* bit ops */                           \
  97   OP(OR_EQ,             "|=")                                           \
  98   OP(XOR_EQ,            "^=")                                           \
  99   OP(RSHIFT_EQ,         ">>=")                                          \
 100   OP(LSHIFT_EQ,         "<<=")                                          \
 101   /* Digraphs together, beginning with CPP_FIRST_DIGRAPH.  */           \
 102   OP(HASH,              "#")    /* digraphs */                          \
 103   OP(PASTE,             "##")                                           \
 104   OP(OPEN_SQUARE,       "[")                                            \
 105   OP(CLOSE_SQUARE,      "]")                                            \
 106   OP(OPEN_BRACE,        "{")                                            \
 107   OP(CLOSE_BRACE,       "}")                                            \
 108   /* The remainder of the punctuation.  Order is not significant.  */   \
 109   OP(SEMICOLON,         ";")    /* structure */                         \
 110   OP(ELLIPSIS,          "...")                                          \
 111   OP(PLUS_PLUS,         "++")   /* increment */                         \
 112   OP(MINUS_MINUS,       "--")                                           \
 113   OP(DEREF,             "->")   /* accessors */                         \
 114   OP(DOT,               ".")                                            \
 115   OP(SCOPE,             "::")                                           \
 116   OP(DEREF_STAR,        "->*")                                          \
 117   OP(DOT_STAR,          ".*")                                           \
 118   OP(ATSIGN,            "@")  /* used in Objective-C */                 \
 119                                                                         \
 120   TK(NAME,              IDENT)   /* word */                             \
 121   TK(AT_NAME,           IDENT)   /* @word - Objective-C */              \
 122   TK(NUMBER,            LITERAL) /* 34_be+ta  */                        \
 123                                                                         \
 124   TK(CHAR,              LITERAL) /* 'char' */                           \
 125   TK(WCHAR,             LITERAL) /* L'char' */                          \
 126   TK(OTHER,             LITERAL) /* stray punctuation */                \
 127                                                                         \
 128   TK(STRING,            LITERAL) /* "string" */                         \
 129   TK(WSTRING,           LITERAL) /* L"string" */                        \
 130   TK(OBJC_STRING,       LITERAL) /* @"string" - Objective-C */          \
 131   TK(HEADER_NAME,       LITERAL) /* <stdio.h> in #include */            \
 132                                                                         \
 133   TK(COMMENT,           LITERAL) /* Only if output comments.  */        \
 134                                  /* SPELL_LITERAL happens to DTRT.  */  \
 135   TK(MACRO_ARG,         NONE)    /* Macro argument.  */                 \
 136   TK(PRAGMA,            NONE)    /* Only for deferred pragmas.  */      \
 137   TK(PRAGMA_EOL,        NONE)    /* End-of-line for deferred pragmas.  */ \
 138   TK(PADDING,           NONE)    /* Whitespace for -E.  */
 139
 140 #define OP(e, s) CPP_ ## e,
 141 #define TK(e, s) CPP_ ## e,
 142 enum cpp_ttype
 143 {
 144   TTYPE_TABLE
 145   N_TTYPES,
 146
 147   /* Positions in the table.  */
 148   CPP_LAST_EQ        = CPP_LSHIFT,
 149   CPP_FIRST_DIGRAPH  = CPP_HASH,
 150   CPP_LAST_PUNCTUATOR= CPP_ATSIGN,
 151   CPP_LAST_CPP_OP    = CPP_LESS_EQ
 152 };
 153 #undef OP
 154 #undef TK
 155
 156 /* C language kind, used when calling cpp_create_reader.  */
 157 enum c_lang {CLK_GNUC89 = 0, CLK_GNUC99, CLK_STDC89, CLK_STDC94, CLK_STDC99,
 158              CLK_GNUCXX, CLK_CXX98, CLK_GNUCXX0X, CLK_CXX0X, CLK_ASM};
 159
 160 /* Payload of a NUMBER, STRING, CHAR or COMMENT token.  */
 161 struct cpp_string GTY(())
 162 {
 163   unsigned int len;
 164   const unsigned char *text;
 165 };
 166
 167 /* Flags for the cpp_token structure.  */
 168 #define PREV_WHITE      (1 << 0) /* If whitespace before this token.  */
 169 #define DIGRAPH         (1 << 1) /* If it was a digraph.  */
 170 #define STRINGIFY_ARG   (1 << 2) /* If macro argument to be stringified.  */
 171 #define PASTE_LEFT      (1 << 3) /* If on LHS of a ## operator.  */
 172 #define NAMED_OP        (1 << 4) /* C++ named operators.  */
 173 #define NO_EXPAND       (1 << 5) /* Do not macro-expand this token.  */
 174 #define BOL             (1 << 6) /* Token at beginning of line.  */
 175 #define PURE_ZERO       (1 << 7) /* Single 0 digit, used by the C++ frontend,
 176                                     set in c-lex.c.  */
 177
 178 /* Specify which field, if any, of the cpp_token union is used.  */
 179
 180 enum cpp_token_fld_kind {
 181   CPP_TOKEN_FLD_NODE,
 182   CPP_TOKEN_FLD_SOURCE,
 183   CPP_TOKEN_FLD_STR,
 184   CPP_TOKEN_FLD_ARG_NO,
 185   CPP_TOKEN_FLD_PRAGMA,
 186   CPP_TOKEN_FLD_NONE
 187 };
 188
 189 /* A preprocessing token.  This has been carefully packed and should
 190    occupy 16 bytes on 32-bit hosts and 24 bytes on 64-bit hosts.  */
 191 struct cpp_token GTY(())
 192 {
 193   source_location src_loc;      /* Location of first char of token.  */
 194   ENUM_BITFIELD(cpp_ttype) type : CHAR_BIT;  /* token type */
 195   unsigned char flags;          /* flags - see above */
 196
 197   union cpp_token_u
 198   {
 199     /* An identifier.  */
 200     cpp_hashnode *
 201       GTY ((nested_ptr (union tree_node,
 202                 "%h ? CPP_HASHNODE (GCC_IDENT_TO_HT_IDENT (%h)) : NULL",
 203                         "%h ? HT_IDENT_TO_GCC_IDENT (HT_NODE (%h)) : NULL"),
 204             tag ("CPP_TOKEN_FLD_NODE")))
 205          node;
 206
 207     /* Inherit padding from this token.  */
 208     cpp_token * GTY ((tag ("CPP_TOKEN_FLD_SOURCE"))) source;
 209
 210     /* A string, or number.  */
 211     struct cpp_string GTY ((tag ("CPP_TOKEN_FLD_STR"))) str;
 212
 213     /* Argument no. for a CPP_MACRO_ARG.  */
 214     unsigned int GTY ((tag ("CPP_TOKEN_FLD_ARG_NO"))) arg_no;
 215
 216     /* Caller-supplied identifier for a CPP_PRAGMA.  */
 217     unsigned int GTY ((tag ("CPP_TOKEN_FLD_PRAGMA"))) pragma;
 218   } GTY ((desc ("cpp_token_val_index (&%1)"))) val;
 219 };
 220
 221 /* Say which field is in use.  */
 222 extern enum cpp_token_fld_kind cpp_token_val_index (cpp_token *tok);
 223
 224 /* A type wide enough to hold any multibyte source character.
 225    cpplib's character constant interpreter requires an unsigned type.
 226    Also, a typedef for the signed equivalent.
 227    The width of this type is capped at 32 bits; there do exist targets
 228    where wchar_t is 64 bits, but only in a non-default mode, and there
 229    would be no meaningful interpretation for a wchar_t value greater
 230    than 2^32 anyway -- the widest wide-character encoding around is
 231    ISO 10646, which stops at 2^31.  */
 232 #if CHAR_BIT * SIZEOF_INT >= 32
 233 # define CPPCHAR_SIGNED_T int
 234 #elif CHAR_BIT * SIZEOF_LONG >= 32
 235 # define CPPCHAR_SIGNED_T long
 236 #else
 237 # error "Cannot find a least-32-bit signed integer type"
 238 #endif
 239 typedef unsigned CPPCHAR_SIGNED_T cppchar_t;
 240 typedef CPPCHAR_SIGNED_T cppchar_signed_t;
 241
 242 /* Style of header dependencies to generate.  */
 243 enum cpp_deps_style { DEPS_NONE = 0, DEPS_USER, DEPS_SYSTEM };
 244
 245 /* The possible normalization levels, from most restrictive to least.  */
 246 enum cpp_normalize_level {
 247   /* In NFKC.  */
 248   normalized_KC = 0,
 249   /* In NFC.  */
 250   normalized_C,
 251   /* In NFC, except for subsequences where being in NFC would make
 252      the identifier invalid.  */
 253   normalized_identifier_C,
 254   /* Not normalized at all.  */
 255   normalized_none
 256 };
 257
 258 /* This structure is nested inside struct cpp_reader, and
 259    carries all the options visible to the command line.  */
 260 struct cpp_options
 261 {
 262   /* Characters between tab stops.  */
 263   unsigned int tabstop;
 264
 265   /* The language we're preprocessing.  */
 266   enum c_lang lang;
 267
 268   /* Nonzero means use extra default include directories for C++.  */
 269   unsigned char cplusplus;
 270
 271   /* Nonzero means handle cplusplus style comments.  */
 272   unsigned char cplusplus_comments;
 273
 274   /* Nonzero means define __OBJC__, treat @ as a special token, and
 275      use the OBJC[PLUS]_INCLUDE_PATH environment variable.  */
 276   unsigned char objc;
 277
 278   /* Nonzero means don't copy comments into the output file.  */
 279   unsigned char discard_comments;
 280
 281   /* Nonzero means don't copy comments into the output file during
 282      macro expansion.  */
 283   unsigned char discard_comments_in_macro_exp;
 284
 285   /* Nonzero means process the ISO trigraph sequences.  */
 286   unsigned char trigraphs;
 287
 288   /* Nonzero means process the ISO digraph sequences.  */
 289   unsigned char digraphs;
 290
 291   /* Nonzero means to allow hexadecimal floats and LL suffixes.  */
 292   unsigned char extended_numbers;
 293
 294   /* Nonzero means print names of header files (-H).  */
 295   unsigned char print_include_names;
 296
 297   /* Nonzero means cpp_pedwarn causes a hard error.  */
 298   unsigned char pedantic_errors;
 299
 300   /* Nonzero means don't print warning messages.  */
 301   unsigned char inhibit_warnings;
 302
 303   /* Nonzero means complain about deprecated features.  */
 304   unsigned char warn_deprecated;
 305
 306   /* Nonzero means don't suppress warnings from system headers.  */
 307   unsigned char warn_system_headers;
 308
 309   /* Nonzero means don't print error messages.  Has no option to
 310      select it, but can be set by a user of cpplib (e.g. fix-header).  */
 311   unsigned char inhibit_errors;
 312
 313   /* Nonzero means warn if slash-star appears in a comment.  */
 314   unsigned char warn_comments;
 315
 316   /* Nonzero means warn if a user-supplied include directory does not
 317      exist.  */
 318   unsigned char warn_missing_include_dirs;
 319
 320   /* Nonzero means warn if there are any trigraphs.  */
 321   unsigned char warn_trigraphs;
 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 long long numeric constants.  */
 331   unsigned char warn_long_long;
 332
 333   /* Nonzero means warn about text after an #endif (or #else).  */
 334   unsigned char warn_endif_labels;
 335
 336   /* Nonzero means warn about implicit sign changes owing to integer
 337      promotions.  */
 338   unsigned char warn_num_sign_change;
 339
 340   /* Zero means don't warn about __VA_ARGS__ usage in c89 pedantic mode.
 341      Presumably the usage is protected by the appropriate #ifdef.  */
 342   unsigned char warn_variadic_macros;
 343
 344   /* Nonzero means turn warnings into errors.  */
 345   unsigned char warnings_are_errors;
 346
 347   /* Nonzero means we should look for header.gcc files that remap file
 348      names.  */
 349   unsigned char remap;
 350
 351   /* Zero means dollar signs are punctuation.  */
 352   unsigned char dollars_in_ident;
 353
 354   /* Nonzero means UCNs are accepted in identifiers.  */
 355   unsigned char extended_identifiers;
 356
 357   /* True if we should warn about dollars in identifiers or numbers
 358      for this translation unit.  */
 359   unsigned char warn_dollars;
 360
 361   /* Nonzero means warn if undefined identifiers are evaluated in an #if.  */
 362   unsigned char warn_undef;
 363
 364   /* Nonzero means warn of unused macros from the main file.  */
 365   unsigned char warn_unused_macros;
 366
 367   /* Nonzero for the 1999 C Standard, including corrigenda and amendments.  */
 368   unsigned char c99;
 369
 370   /* Nonzero if we are conforming to a specific C or C++ standard.  */
 371   unsigned char std;
 372
 373   /* Nonzero means give all the error messages the ANSI standard requires.  */
 374   unsigned char pedantic;
 375
 376   /* Nonzero means we're looking at already preprocessed code, so don't
 377      bother trying to do macro expansion and whatnot.  */
 378   unsigned char preprocessed;
 379
 380   /* Print column number in error messages.  */
 381   unsigned char show_column;
 382
 383   /* Nonzero means handle C++ alternate operator names.  */
 384   unsigned char operator_names;
 385
 386   /* True for traditional preprocessing.  */
 387   unsigned char traditional;
 388
 389   /* Holds the name of the target (execution) character set.  */
 390   const char *narrow_charset;
 391
 392   /* Holds the name of the target wide character set.  */
 393   const char *wide_charset;
 394
 395   /* Holds the name of the input character set.  */
 396   const char *input_charset;
 397
 398   /* The minimum permitted level of normalization before a warning
 399      is generated.  */
 400   enum cpp_normalize_level warn_normalize;
 401
 402   /* True to warn about precompiled header files we couldn't use.  */
 403   bool warn_invalid_pch;
 404
 405   /* True if dependencies should be restored from a precompiled header.  */
 406   bool restore_pch_deps;
 407
 408   /* Dependency generation.  */
 409   struct
 410   {
 411     /* Style of header dependencies to generate.  */
 412     enum cpp_deps_style style;
 413
 414     /* Assume missing files are generated files.  */
 415     bool missing_files;
 416
 417     /* Generate phony targets for each dependency apart from the first
 418        one.  */
 419     bool phony_targets;
 420
 421     /* If true, no dependency is generated on the main file.  */
 422     bool ignore_main_file;
 423   } deps;
 424
 425   /* Target-specific features set by the front end or client.  */
 426
 427   /* Precision for target CPP arithmetic, target characters, target
 428      ints and target wide characters, respectively.  */
 429   size_t precision, char_precision, int_precision, wchar_precision;
 430
 431   /* True means chars (wide chars) are unsigned.  */
 432   bool unsigned_char, unsigned_wchar;
 433
 434   /* True if the most significant byte in a word has the lowest
 435      address in memory.  */
 436   bool bytes_big_endian;
 437
 438   /* Nonzero means __STDC__ should have the value 0 in system headers.  */
 439   unsigned char stdc_0_in_system_headers;
 440
 441   /* True means error callback should be used for diagnostics.  */
 442   bool client_diagnostic;
 443
 444   /* True disables tokenization outside of preprocessing directives. */
 445   bool directives_only;
 446 };
 447
 448 /* Callback for header lookup for HEADER, which is the name of a
 449    source file.  It is used as a method of last resort to find headers
 450    that are not otherwise found during the normal include processing.
 451    The return value is the malloced name of a header to try and open,
 452    if any, or NULL otherwise.  This callback is called only if the
 453    header is otherwise unfound.  */
 454 typedef const char *(*missing_header_cb)(cpp_reader *, const char *header, cpp_dir **);
 455
 456 /* Call backs to cpplib client.  */
 457 struct cpp_callbacks
 458 {
 459   /* Called when a new line of preprocessed output is started.  */
 460   void (*line_change) (cpp_reader *, const cpp_token *, int);
 461
 462   /* Called when switching to/from a new file.
 463      The line_map is for the new file.  It is NULL if there is no new file.
 464      (In C this happens when done with <built-in>+<command line> and also
 465      when done with a main file.)  This can be used for resource cleanup.  */
 466   void (*file_change) (cpp_reader *, const struct line_map *);
 467
 468   void (*dir_change) (cpp_reader *, const char *);
 469   void (*include) (cpp_reader *, unsigned int, const unsigned char *,
 470                    const char *, int, const cpp_token **);
 471   void (*define) (cpp_reader *, unsigned int, cpp_hashnode *);
 472   void (*undef) (cpp_reader *, unsigned int, cpp_hashnode *);
 473   void (*ident) (cpp_reader *, unsigned int, const cpp_string *);
 474   void (*def_pragma) (cpp_reader *, unsigned int);
 475   int (*valid_pch) (cpp_reader *, const char *, int);
 476   void (*read_pch) (cpp_reader *, const char *, int, const char *);
 477   missing_header_cb missing_header;
 478
 479   /* Called to emit a diagnostic if client_diagnostic option is true.
 480      This callback receives the translated message.  */
 481   void (*error) (cpp_reader *, int, const char *, va_list *)
 482        ATTRIBUTE_FPTR_PRINTF(3,0);
 483 };
 484
 485 /* Chain of directories to look for include files in.  */
 486 struct cpp_dir
 487 {
 488   /* NULL-terminated singly-linked list.  */
 489   struct cpp_dir *next;
 490
 491   /* NAME of the directory, NUL-terminated.  */
 492   char *name;
 493   unsigned int len;
 494
 495   /* One if a system header, two if a system header that has extern
 496      "C" guards for C++.  */
 497   unsigned char sysp;
 498
 499   /* Mapping of file names for this directory for MS-DOS and related
 500      platforms.  A NULL-terminated array of (from, to) pairs.  */
 501   const char **name_map;
 502
 503   /* Routine to construct pathname, given the search path name and the
 504      HEADER we are trying to find, return a constructed pathname to
 505      try and open.  If this is NULL, the constructed pathname is as
 506      constructed by append_file_to_dir.  */
 507   char *(*construct) (const char *header, cpp_dir *dir);
 508
 509   /* The C front end uses these to recognize duplicated
 510      directories in the search path.  */
 511   ino_t ino;
 512   dev_t dev;
 513
 514   /* Is this a user-supplied directory? */
 515   bool user_supplied_p;
 516 };
 517
 518 /* Name under which this program was invoked.  */
 519 extern const char *progname;
 520
 521 /* The structure of a node in the hash table.  The hash table has
 522    entries for all identifiers: either macros defined by #define
 523    commands (type NT_MACRO), assertions created with #assert
 524    (NT_ASSERTION), or neither of the above (NT_VOID).  Builtin macros
 525    like __LINE__ are flagged NODE_BUILTIN.  Poisoned identifiers are
 526    flagged NODE_POISONED.  NODE_OPERATOR (C++ only) indicates an
 527    identifier that behaves like an operator such as "xor".
 528    NODE_DIAGNOSTIC is for speed in lex_token: it indicates a
 529    diagnostic may be required for this node.  Currently this only
 530    applies to __VA_ARGS__ and poisoned identifiers.  */
 531
 532 /* Hash node flags.  */
 533 #define NODE_OPERATOR   (1 << 0)        /* C++ named operator.  */
 534 #define NODE_POISONED   (1 << 1)        /* Poisoned identifier.  */
 535 #define NODE_BUILTIN    (1 << 2)        /* Builtin macro.  */
 536 #define NODE_DIAGNOSTIC (1 << 3)        /* Possible diagnostic when lexed.  */
 537 #define NODE_WARN       (1 << 4)        /* Warn if redefined or undefined.  */
 538 #define NODE_DISABLED   (1 << 5)        /* A disabled macro.  */
 539 #define NODE_MACRO_ARG  (1 << 6)        /* Used during #define processing.  */
 540
 541 /* Different flavors of hash node.  */
 542 enum node_type
 543 {
 544   NT_VOID = 0,     /* No definition yet.  */
 545   NT_MACRO,        /* A macro of some form.  */
 546   NT_ASSERTION     /* Predicate for #assert.  */
 547 };
 548
 549 /* Different flavors of builtin macro.  _Pragma is an operator, but we
 550    handle it with the builtin code for efficiency reasons.  */
 551 enum builtin_type
 552 {
 553   BT_SPECLINE = 0,              /* `__LINE__' */
 554   BT_DATE,                      /* `__DATE__' */
 555   BT_FILE,                      /* `__FILE__' */
 556   BT_BASE_FILE,                 /* `__BASE_FILE__' */
 557   BT_INCLUDE_LEVEL,             /* `__INCLUDE_LEVEL__' */
 558   BT_TIME,                      /* `__TIME__' */
 559   BT_STDC,                      /* `__STDC__' */
 560   BT_PRAGMA,                    /* `_Pragma' operator */
 561   BT_TIMESTAMP,                 /* `__TIMESTAMP__' */
 562   BT_COUNTER                    /* `__COUNTER__' */
 563 };
 564
 565 #define CPP_HASHNODE(HNODE)     ((cpp_hashnode *) (HNODE))
 566 #define HT_NODE(NODE)           ((ht_identifier *) (NODE))
 567 #define NODE_LEN(NODE)          HT_LEN (&(NODE)->ident)
 568 #define NODE_NAME(NODE)         HT_STR (&(NODE)->ident)
 569
 570 /* Specify which field, if any, of the union is used.  */
 571
 572 enum {
 573   NTV_MACRO,
 574   NTV_ANSWER,
 575   NTV_BUILTIN,
 576   NTV_ARGUMENT,
 577   NTV_NONE
 578 };
 579
 580 #define CPP_HASHNODE_VALUE_IDX(HNODE)                           \
 581   ((HNODE.flags & NODE_MACRO_ARG) ? NTV_ARGUMENT                \
 582    : HNODE.type == NT_MACRO ? ((HNODE.flags & NODE_BUILTIN)     \
 583                                ? NTV_BUILTIN : NTV_MACRO)       \
 584    : HNODE.type == NT_ASSERTION ? NTV_ANSWER                    \
 585    : NTV_NONE)
 586
 587 /* The common part of an identifier node shared amongst all 3 C front
 588    ends.  Also used to store CPP identifiers, which are a superset of
 589    identifiers in the grammatical sense.  */
 590
 591 union _cpp_hashnode_value GTY(())
 592 {
 593   /* If a macro.  */
 594   cpp_macro * GTY((tag ("NTV_MACRO"))) macro;
 595   /* Answers to an assertion.  */
 596   struct answer * GTY ((tag ("NTV_ANSWER"))) answers;
 597   /* Code for a builtin macro.  */
 598   enum builtin_type GTY ((tag ("NTV_BUILTIN"))) builtin;
 599   /* Macro argument index.  */
 600   unsigned short GTY ((tag ("NTV_ARGUMENT"))) arg_index;
 601 };
 602
 603 struct cpp_hashnode GTY(())
 604 {
 605   struct ht_identifier ident;
 606   unsigned int is_directive : 1;
 607   unsigned int directive_index : 7;     /* If is_directive,
 608                                            then index into directive table.
 609                                            Otherwise, a NODE_OPERATOR.  */
 610   unsigned char rid_code;               /* Rid code - for front ends.  */
 611   ENUM_BITFIELD(node_type) type : 8;    /* CPP node type.  */
 612   unsigned char flags;                  /* CPP flags.  */
 613
 614   union _cpp_hashnode_value GTY ((desc ("CPP_HASHNODE_VALUE_IDX (%1)"))) value;
 615 };
 616
 617 /* Call this first to get a handle to pass to other functions.
 618
 619    If you want cpplib to manage its own hashtable, pass in a NULL
 620    pointer.  Otherwise you should pass in an initialized hash table
 621    that cpplib will share; this technique is used by the C front
 622    ends.  */
 623 extern cpp_reader *cpp_create_reader (enum c_lang, struct ht *,
 624                                       struct line_maps *);
 625
 626 /* Reset the cpp_reader's line_map.  This is only used after reading a
 627    PCH file.  */
 628 extern void cpp_set_line_map (cpp_reader *, struct line_maps *);
 629
 630 /* Call this to change the selected language standard (e.g. because of
 631    command line options).  */
 632 extern void cpp_set_lang (cpp_reader *, enum c_lang);
 633
 634 /* Set the include paths.  */
 635 extern void cpp_set_include_chains (cpp_reader *, cpp_dir *, cpp_dir *, int);
 636
 637 /* Call these to get pointers to the options, callback, and deps
 638    structures for a given reader.  These pointers are good until you
 639    call cpp_finish on that reader.  You can either edit the callbacks
 640    through the pointer returned from cpp_get_callbacks, or set them
 641    with cpp_set_callbacks.  */
 642 extern cpp_options *cpp_get_options (cpp_reader *);
 643 extern cpp_callbacks *cpp_get_callbacks (cpp_reader *);
 644 extern void cpp_set_callbacks (cpp_reader *, cpp_callbacks *);
 645 extern struct deps *cpp_get_deps (cpp_reader *);
 646
 647 /* This function reads the file, but does not start preprocessing.  It
 648    returns the name of the original file; this is the same as the
 649    input file, except for preprocessed input.  This will generate at
 650    least one file change callback, and possibly a line change callback
 651    too.  If there was an error opening the file, it returns NULL.  */
 652 extern const char *cpp_read_main_file (cpp_reader *, const char *);
 653
 654 /* Set up built-ins with special behavior.  Use cpp_init_builtins()
 655    instead unless your know what you are doing.  */
 656 extern void cpp_init_special_builtins (cpp_reader *);
 657
 658 /* Set up built-ins like __FILE__.  */
 659 extern void cpp_init_builtins (cpp_reader *, int);
 660
 661 /* This is called after options have been parsed, and partially
 662    processed.  */
 663 extern void cpp_post_options (cpp_reader *);
 664
 665 /* Set up translation to the target character set.  */
 666 extern void cpp_init_iconv (cpp_reader *);
 667
 668 /* Call this to finish preprocessing.  If you requested dependency
 669    generation, pass an open stream to write the information to,
 670    otherwise NULL.  It is your responsibility to close the stream.
 671
 672    Returns cpp_errors (pfile).  */
 673 extern int cpp_finish (cpp_reader *, FILE *deps_stream);
 674
 675 /* Call this to release the handle at the end of preprocessing.  Any
 676    use of the handle after this function returns is invalid.  Returns
 677    cpp_errors (pfile).  */
 678 extern void cpp_destroy (cpp_reader *);
 679
 680 /* Error count.  */
 681 extern unsigned int cpp_errors (cpp_reader *);
 682
 683 extern unsigned int cpp_token_len (const cpp_token *);
 684 extern unsigned char *cpp_token_as_text (cpp_reader *, const cpp_token *);
 685 extern unsigned char *cpp_spell_token (cpp_reader *, const cpp_token *,
 686                                        unsigned char *, bool);
 687 extern void cpp_register_pragma (cpp_reader *, const char *, const char *,
 688                                  void (*) (cpp_reader *), bool);
 689 extern void cpp_register_deferred_pragma (cpp_reader *, const char *,
 690                                           const char *, unsigned, bool, bool);
 691 extern int cpp_avoid_paste (cpp_reader *, const cpp_token *,
 692                             const cpp_token *);
 693 extern const cpp_token *cpp_get_token (cpp_reader *);
 694 extern const cpp_token *cpp_get_token_with_location (cpp_reader *,
 695                                                      source_location *);
 696 extern const unsigned char *cpp_macro_definition (cpp_reader *,
 697                                                   const cpp_hashnode *);
 698 extern void _cpp_backup_tokens (cpp_reader *, unsigned int);
 699
 700 /* Evaluate a CPP_CHAR or CPP_WCHAR token.  */
 701 extern cppchar_t cpp_interpret_charconst (cpp_reader *, const cpp_token *,
 702                                           unsigned int *, int *);
 703 /* Evaluate a vector of CPP_STRING or CPP_WSTRING tokens.  */
 704 extern bool cpp_interpret_string (cpp_reader *,
 705                                   const cpp_string *, size_t,
 706                                   cpp_string *, bool);
 707 extern bool cpp_interpret_string_notranslate (cpp_reader *,
 708                                               const cpp_string *, size_t,
 709                                               cpp_string *, bool);
 710
 711 /* Convert a host character constant to the execution character set.  */
 712 extern cppchar_t cpp_host_to_exec_charset (cpp_reader *, cppchar_t);
 713
 714 /* Used to register macros and assertions, perhaps from the command line.
 715    The text is the same as the command line argument.  */
 716 extern void cpp_define (cpp_reader *, const char *);
 717 extern void cpp_assert (cpp_reader *, const char *);
 718 extern void cpp_undef (cpp_reader *, const char *);
 719 extern void cpp_unassert (cpp_reader *, const char *);
 720
 721 extern cpp_macro *cpp_push_definition (cpp_reader *, const char *);
 722 extern void cpp_pop_definition (cpp_reader *, const char *, cpp_macro *);
 723
 724 /* Undefine all macros and assertions.  */
 725 extern void cpp_undef_all (cpp_reader *);
 726
 727 extern cpp_buffer *cpp_push_buffer (cpp_reader *, const unsigned char *,
 728                                     size_t, int);
 729 extern int cpp_defined (cpp_reader *, const unsigned char *, int);
 730
 731 /* A preprocessing number.  Code assumes that any unused high bits of
 732    the double integer are set to zero.  */
 733 typedef unsigned HOST_WIDE_INT cpp_num_part;
 734 typedef struct cpp_num cpp_num;
 735 struct cpp_num
 736 {
 737   cpp_num_part high;
 738   cpp_num_part low;
 739   bool unsignedp;  /* True if value should be treated as unsigned.  */
 740   bool overflow;   /* True if the most recent calculation overflowed.  */
 741 };
 742
 743 /* cpplib provides two interfaces for interpretation of preprocessing
 744    numbers.
 745
 746    cpp_classify_number categorizes numeric constants according to
 747    their field (integer, floating point, or invalid), radix (decimal,
 748    octal, hexadecimal), and type suffixes.  */
 749
 750 #define CPP_N_CATEGORY  0x000F
 751 #define CPP_N_INVALID   0x0000
 752 #define CPP_N_INTEGER   0x0001
 753 #define CPP_N_FLOATING  0x0002
 754
 755 #define CPP_N_WIDTH     0x00F0
 756 #define CPP_N_SMALL     0x0010  /* int, float, shrot _Fract/Accum  */
 757 #define CPP_N_MEDIUM    0x0020  /* long, double, long _Fract/_Accum.  */
 758 #define CPP_N_LARGE     0x0040  /* long long, long double,
 759                                    long long _Fract/Accum.  */
 760
 761 #define CPP_N_WIDTH_MD  0xF0000 /* machine defined.  */
 762 #define CPP_N_MD_W      0x10000
 763 #define CPP_N_MD_Q      0x20000
 764
 765 #define CPP_N_RADIX     0x0F00
 766 #define CPP_N_DECIMAL   0x0100
 767 #define CPP_N_HEX       0x0200
 768 #define CPP_N_OCTAL     0x0400
 769 #define CPP_N_BINARY    0x0800
 770
 771 #define CPP_N_UNSIGNED  0x1000  /* Properties.  */
 772 #define CPP_N_IMAGINARY 0x2000
 773 #define CPP_N_DFLOAT    0x4000
 774
 775 #define CPP_N_FRACT     0x100000 /* Fract types.  */
 776 #define CPP_N_ACCUM     0x200000 /* Accum types.  */
 777
 778 /* Classify a CPP_NUMBER token.  The return value is a combination of
 779    the flags from the above sets.  */
 780 extern unsigned cpp_classify_number (cpp_reader *, const cpp_token *);
 781
 782 /* Evaluate a token classified as category CPP_N_INTEGER.  */
 783 extern cpp_num cpp_interpret_integer (cpp_reader *, const cpp_token *,
 784                                       unsigned int type);
 785
 786 /* Sign extend a number, with PRECISION significant bits and all
 787    others assumed clear, to fill out a cpp_num structure.  */
 788 cpp_num cpp_num_sign_extend (cpp_num, size_t);
 789
 790 /* Diagnostic levels.  To get a diagnostic without associating a
 791    position in the translation unit with it, use cpp_error_with_line
 792    with a line number of zero.  */
 793
 794 /* Warning, an error with -Werror.  */
 795 #define CPP_DL_WARNING          0x00
 796 /* Same as CPP_DL_WARNING, except it is not suppressed in system headers.  */
 797 #define CPP_DL_WARNING_SYSHDR   0x01
 798 /* Warning, an error with -pedantic-errors or -Werror.  */
 799 #define CPP_DL_PEDWARN          0x02
 800 /* An error.  */
 801 #define CPP_DL_ERROR            0x03
 802 /* An internal consistency check failed.  Prints "internal error: ",
 803    otherwise the same as CPP_DL_ERROR.  */
 804 #define CPP_DL_ICE              0x04
 805 /* Extracts a diagnostic level from an int.  */
 806 #define CPP_DL_EXTRACT(l)       (l & 0xf)
 807 /* Nonzero if a diagnostic level is one of the warnings.  */
 808 #define CPP_DL_WARNING_P(l)     (CPP_DL_EXTRACT (l) >= CPP_DL_WARNING \
 809                                  && CPP_DL_EXTRACT (l) <= CPP_DL_PEDWARN)
 810
 811 /* Output a diagnostic of some kind.  */
 812 extern void cpp_error (cpp_reader *, int, const char *msgid, ...)
 813   ATTRIBUTE_PRINTF_3;
 814
 815 /* Output a diagnostic with "MSGID: " preceding the
 816    error string of errno.  No location is printed.  */
 817 extern void cpp_errno (cpp_reader *, int, const char *msgid);
 818
 819 /* Same as cpp_error, except additionally specifies a position as a
 820    (translation unit) physical line and physical column.  If the line is
 821    zero, then no location is printed.  */
 822 extern void cpp_error_with_line (cpp_reader *, int, source_location, unsigned,
 823                                  const char *msgid, ...) ATTRIBUTE_PRINTF_5;
 824
 825 /* In cpplex.c */
 826 extern int cpp_ideq (const cpp_token *, const char *);
 827 extern void cpp_output_line (cpp_reader *, FILE *);
 828 extern void cpp_output_token (const cpp_token *, FILE *);
 829 extern const char *cpp_type2name (enum cpp_ttype);
 830 /* Returns the value of an escape sequence, truncated to the correct
 831    target precision.  PSTR points to the input pointer, which is just
 832    after the backslash.  LIMIT is how much text we have.  WIDE is true
 833    if the escape sequence is part of a wide character constant or
 834    string literal.  Handles all relevant diagnostics.  */
 835 extern cppchar_t cpp_parse_escape (cpp_reader *, const unsigned char ** pstr,
 836                                    const unsigned char *limit, int wide);
 837
 838 /* In cpphash.c */
 839
 840 /* Lookup an identifier in the hashtable.  Puts the identifier in the
 841    table if it is not already there.  */
 842 extern cpp_hashnode *cpp_lookup (cpp_reader *, const unsigned char *,
 843                                  unsigned int);
 844
 845 typedef int (*cpp_cb) (cpp_reader *, cpp_hashnode *, void *);
 846 extern void cpp_forall_identifiers (cpp_reader *, cpp_cb, void *);
 847
 848 /* In cppmacro.c */
 849 extern void cpp_scan_nooutput (cpp_reader *);
 850 extern int  cpp_sys_macro_p (cpp_reader *);
 851 extern unsigned char *cpp_quote_string (unsigned char *, const unsigned char *,
 852                                         unsigned int);
 853
 854 /* In cppfiles.c */
 855 extern bool cpp_included (cpp_reader *, const char *);
 856 extern bool cpp_included_before (cpp_reader *, const char *, source_location);
 857 extern void cpp_make_system_header (cpp_reader *, int, int);
 858 extern bool cpp_push_include (cpp_reader *, const char *);
 859 extern void cpp_change_file (cpp_reader *, enum lc_reason, const char *);
 860 extern const char *cpp_get_path (struct _cpp_file *);
 861 extern cpp_dir *cpp_get_dir (struct _cpp_file *);
 862 extern cpp_buffer *cpp_get_buffer (cpp_reader *);
 863 extern struct _cpp_file *cpp_get_file (cpp_buffer *);
 864 extern cpp_buffer *cpp_get_prev (cpp_buffer *);
 865 extern void cpp_clear_file_cache (cpp_reader *);
 866
 867 /* In cpppch.c */
 868 struct save_macro_data;
 869 extern int cpp_save_state (cpp_reader *, FILE *);
 870 extern int cpp_write_pch_deps (cpp_reader *, FILE *);
 871 extern int cpp_write_pch_state (cpp_reader *, FILE *);
 872 extern int cpp_valid_state (cpp_reader *, const char *, int);
 873 extern void cpp_prepare_state (cpp_reader *, struct save_macro_data **);
 874 extern int cpp_read_state (cpp_reader *, const char *, FILE *,
 875                            struct save_macro_data *);
 876
 877 #ifdef __cplusplus
 878 }
 879 #endif
 880
 881 #endif /* ! LIBCPP_CPPLIB_H */