gcc/cpplib.h

   1 /* Definitions for CPP library.
   2    Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
   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 struct _cpp_file;
  46
  47 /* The first three groups, apart from '=', can appear in preprocessor
  48    expressions (+= and -= are used to indicate unary + and - resp.).
  49    This allows a lookup table to be implemented in _cpp_parse_expr.
  50
  51    The first group, to CPP_LAST_EQ, can be immediately followed by an
  52    '='.  The lexer needs operators ending in '=', like ">>=", to be in
  53    the same order as their counterparts without the '=', like ">>".  */
  54
  55 /* Positions in the table.  */
  56 #define CPP_LAST_EQ CPP_MAX
  57 #define CPP_FIRST_DIGRAPH CPP_HASH
  58 #define CPP_LAST_PUNCTUATOR CPP_DOT_STAR
  59 #define CPP_LAST_CPP_OP CPP_LESS_EQ
  60
  61 #define TTYPE_TABLE                             \
  62   OP(CPP_EQ = 0,        "=")                    \
  63   OP(CPP_NOT,           "!")                    \
  64   OP(CPP_GREATER,       ">")    /* compare */   \
  65   OP(CPP_LESS,          "<")                    \
  66   OP(CPP_PLUS,          "+")    /* math */      \
  67   OP(CPP_MINUS,         "-")                    \
  68   OP(CPP_MULT,          "*")                    \
  69   OP(CPP_DIV,           "/")                    \
  70   OP(CPP_MOD,           "%")                    \
  71   OP(CPP_AND,           "&")    /* bit ops */   \
  72   OP(CPP_OR,            "|")                    \
  73   OP(CPP_XOR,           "^")                    \
  74   OP(CPP_RSHIFT,        ">>")                   \
  75   OP(CPP_LSHIFT,        "<<")                   \
  76   OP(CPP_MIN,           "<?")   /* extension */ \
  77   OP(CPP_MAX,           ">?")                   \
  78 \
  79   OP(CPP_COMPL,         "~")                    \
  80   OP(CPP_AND_AND,       "&&")   /* logical */   \
  81   OP(CPP_OR_OR,         "||")                   \
  82   OP(CPP_QUERY,         "?")                    \
  83   OP(CPP_COLON,         ":")                    \
  84   OP(CPP_COMMA,         ",")    /* grouping */  \
  85   OP(CPP_OPEN_PAREN,    "(")                    \
  86   OP(CPP_CLOSE_PAREN,   ")")                    \
  87   TK(CPP_EOF,           SPELL_NONE)             \
  88   OP(CPP_EQ_EQ,         "==")   /* compare */   \
  89   OP(CPP_NOT_EQ,        "!=")                   \
  90   OP(CPP_GREATER_EQ,    ">=")                   \
  91   OP(CPP_LESS_EQ,       "<=")                   \
  92 \
  93   /* These two are unary + / - in preprocessor expressions.  */ \
  94   OP(CPP_PLUS_EQ,       "+=")   /* math */      \
  95   OP(CPP_MINUS_EQ,      "-=")                   \
  96 \
  97   OP(CPP_MULT_EQ,       "*=")                   \
  98   OP(CPP_DIV_EQ,        "/=")                   \
  99   OP(CPP_MOD_EQ,        "%=")                   \
 100   OP(CPP_AND_EQ,        "&=")   /* bit ops */   \
 101   OP(CPP_OR_EQ,         "|=")                   \
 102   OP(CPP_XOR_EQ,        "^=")                   \
 103   OP(CPP_RSHIFT_EQ,     ">>=")                  \
 104   OP(CPP_LSHIFT_EQ,     "<<=")                  \
 105   OP(CPP_MIN_EQ,        "<?=")  /* extension */ \
 106   OP(CPP_MAX_EQ,        ">?=")                  \
 107   /* Digraphs together, beginning with CPP_FIRST_DIGRAPH.  */   \
 108   OP(CPP_HASH,          "#")    /* digraphs */  \
 109   OP(CPP_PASTE,         "##")                   \
 110   OP(CPP_OPEN_SQUARE,   "[")                    \
 111   OP(CPP_CLOSE_SQUARE,  "]")                    \
 112   OP(CPP_OPEN_BRACE,    "{")                    \
 113   OP(CPP_CLOSE_BRACE,   "}")                    \
 114   /* The remainder of the punctuation.  Order is not significant.  */   \
 115   OP(CPP_SEMICOLON,     ";")    /* structure */ \
 116   OP(CPP_ELLIPSIS,      "...")                  \
 117   OP(CPP_PLUS_PLUS,     "++")   /* increment */ \
 118   OP(CPP_MINUS_MINUS,   "--")                   \
 119   OP(CPP_DEREF,         "->")   /* accessors */ \
 120   OP(CPP_DOT,           ".")                    \
 121   OP(CPP_SCOPE,         "::")                   \
 122   OP(CPP_DEREF_STAR,    "->*")                  \
 123   OP(CPP_DOT_STAR,      ".*")                   \
 124   OP(CPP_ATSIGN,        "@")  /* used in Objective-C */ \
 125 \
 126   TK(CPP_NAME,          SPELL_IDENT)    /* word */                      \
 127   TK(CPP_AT_NAME,       SPELL_IDENT)    /* @word - Objective-C */       \
 128   TK(CPP_NUMBER,        SPELL_LITERAL)  /* 34_be+ta  */                 \
 129 \
 130   TK(CPP_CHAR,          SPELL_LITERAL)  /* 'char' */                    \
 131   TK(CPP_WCHAR,         SPELL_LITERAL)  /* L'char' */                   \
 132   TK(CPP_OTHER,         SPELL_LITERAL)  /* stray punctuation */         \
 133 \
 134   TK(CPP_STRING,        SPELL_LITERAL)  /* "string" */                  \
 135   TK(CPP_WSTRING,       SPELL_LITERAL)  /* L"string" */                 \
 136   TK(CPP_OBJC_STRING,   SPELL_LITERAL)  /* @"string" - Objective-C */   \
 137   TK(CPP_HEADER_NAME,   SPELL_LITERAL)  /* <stdio.h> in #include */     \
 138 \
 139   TK(CPP_COMMENT,       SPELL_LITERAL)  /* Only if output comments.  */ \
 140                                         /* SPELL_LITERAL 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   source_location src_loc;      /* Location 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 a user-supplied include directory does not
 268      exist.  */
 269   unsigned char warn_missing_include_dirs;
 270
 271   /* Nonzero means warn if there are any trigraphs.  */
 272   unsigned char warn_trigraphs;
 273
 274   /* Nonzero means warn about multicharacter charconsts.  */
 275   unsigned char warn_multichar;
 276
 277   /* Nonzero means warn about various incompatibilities with
 278      traditional C.  */
 279   unsigned char warn_traditional;
 280
 281   /* Nonzero means warn about long long numeric constants.  */
 282   unsigned char warn_long_long;
 283
 284   /* Nonzero means warn about text after an #endif (or #else).  */
 285   unsigned char warn_endif_labels;
 286
 287   /* Nonzero means warn about implicit sign changes owing to integer
 288      promotions.  */
 289   unsigned char warn_num_sign_change;
 290
 291   /* Zero means don't warn about __VA_ARGS__ usage in c89 pedantic mode.
 292      Presumably the usage is protected by the appropriate #ifdef.  */
 293   unsigned char warn_variadic_macros;
 294
 295   /* Nonzero means turn warnings into errors.  */
 296   unsigned char warnings_are_errors;
 297
 298   /* Nonzero means we should look for header.gcc files that remap file
 299      names.  */
 300   unsigned char remap;
 301
 302   /* Zero means dollar signs are punctuation.  */
 303   unsigned char dollars_in_ident;
 304
 305   /* True if we should warn about dollars in identifiers or numbers
 306      for this translation unit.  */
 307   unsigned char warn_dollars;
 308
 309   /* Nonzero means warn if undefined identifiers are evaluated in an #if.  */
 310   unsigned char warn_undef;
 311
 312   /* Nonzero means warn of unused macros from the main file.  */
 313   unsigned char warn_unused_macros;
 314
 315   /* Nonzero for the 1999 C Standard, including corrigenda and amendments.  */
 316   unsigned char c99;
 317
 318   /* Nonzero if we are conforming to a specific C or C++ standard.  */
 319   unsigned char std;
 320
 321   /* Nonzero means give all the error messages the ANSI standard requires.  */
 322   unsigned char pedantic;
 323
 324   /* Nonzero means we're looking at already preprocessed code, so don't
 325      bother trying to do macro expansion and whatnot.  */
 326   unsigned char preprocessed;
 327
 328   /* Print column number in error messages.  */
 329   unsigned char show_column;
 330
 331   /* Nonzero means handle C++ alternate operator names.  */
 332   unsigned char operator_names;
 333
 334   /* True for traditional preprocessing.  */
 335   unsigned char traditional;
 336
 337   /* Holds the name of the target (execution) character set.  */
 338   const char *narrow_charset;
 339
 340   /* Holds the name of the target wide character set.  */
 341   const char *wide_charset;
 342
 343   /* Holds the name of the input character set.  */
 344   const char *input_charset;
 345
 346   /* True to warn about precompiled header files we couldn't use.  */
 347   bool warn_invalid_pch;
 348
 349   /* True if dependencies should be restored from a precompiled header.  */
 350   bool restore_pch_deps;
 351
 352   /* Dependency generation.  */
 353   struct
 354   {
 355     /* Style of header dependencies to generate.  */
 356     enum {DEPS_NONE = 0, DEPS_USER, DEPS_SYSTEM } style;
 357
 358     /* Assume missing files are generated files.  */
 359     bool missing_files;
 360
 361     /* Generate phony targets for each dependency apart from the first
 362        one.  */
 363     bool phony_targets;
 364
 365     /* If true, no dependency is generated on the main file.  */
 366     bool ignore_main_file;
 367   } deps;
 368
 369   /* Target-specific features set by the front end or client.  */
 370
 371   /* Precision for target CPP arithmetic, target characters, target
 372      ints and target wide characters, respectively.  */
 373   size_t precision, char_precision, int_precision, wchar_precision;
 374
 375   /* True means chars (wide chars) are unsigned.  */
 376   bool unsigned_char, unsigned_wchar;
 377
 378   /* True if the most significant byte in a word has the lowest
 379      address in memory.  */
 380   bool bytes_big_endian;
 381
 382   /* Nonzero means __STDC__ should have the value 0 in system headers.  */
 383   unsigned char stdc_0_in_system_headers;
 384 };
 385
 386 /* Callback for header lookup for HEADER, which is the name of a
 387    source file.  It is used as a method of last resort to find headers
 388    that are not otherwise found during the normal include processing.
 389    The return value is the malloced name of a header to try and open,
 390    if any, or NULL otherwise.  This callback is called only if the
 391    header is otherwise unfound.  */
 392 typedef const char *(*missing_header_cb)(cpp_reader *, const char *header, cpp_dir **);
 393
 394 /* Call backs to cpplib client.  */
 395 struct cpp_callbacks
 396 {
 397   /* Called when a new line of preprocessed output is started.  */
 398   void (*line_change) (cpp_reader *, const cpp_token *, int);
 399
 400   /* Called when switching to/from a new file.
 401      The line_map is for the new file.  It is NULL if there is no new file.
 402      (In C this happens when done with <built-in>+<command line> and also
 403      when done with a main file.)  This can be used for resource cleanup.  */
 404   void (*file_change) (cpp_reader *, const struct line_map *);
 405
 406   void (*dir_change) (cpp_reader *, const char *);
 407   void (*include) (cpp_reader *, unsigned int, const unsigned char *,
 408                    const char *, int);
 409   void (*define) (cpp_reader *, unsigned int, cpp_hashnode *);
 410   void (*undef) (cpp_reader *, unsigned int, cpp_hashnode *);
 411   void (*ident) (cpp_reader *, unsigned int, const cpp_string *);
 412   void (*def_pragma) (cpp_reader *, unsigned int);
 413   int (*valid_pch) (cpp_reader *, const char *, int);
 414   void (*read_pch) (cpp_reader *, const char *, int, const char *);
 415   missing_header_cb missing_header;
 416 };
 417
 418 /* Chain of directories to look for include files in.  */
 419 struct cpp_dir
 420 {
 421   /* NULL-terminated singly-linked list.  */
 422   struct cpp_dir *next;
 423
 424   /* NAME of the directory, NUL-terminated.  */
 425   char *name;
 426   unsigned int len;
 427
 428   /* One if a system header, two if a system header that has extern
 429      "C" guards for C++.  */
 430   unsigned char sysp;
 431
 432   /* Mapping of file names for this directory for MS-DOS and related
 433      platforms.  A NULL-terminated array of (from, to) pairs.  */
 434   const char **name_map;
 435
 436   /* Routine to construct pathname, given the search path name and the
 437      HEADER we are trying to find, return a constructed pathname to
 438      try and open.  If this is NULL, the constructed pathname is as
 439      constructed by append_file_to_dir.  */
 440   char *(*construct) (const char *header, cpp_dir *dir);
 441
 442   /* The C front end uses these to recognize duplicated
 443      directories in the search path.  */
 444   ino_t ino;
 445   dev_t dev;
 446
 447   /* Is this a user-supplied directory? */
 448   bool user_supplied_p;
 449 };
 450
 451 /* Name under which this program was invoked.  */
 452 extern const char *progname;
 453
 454 /* The structure of a node in the hash table.  The hash table has
 455    entries for all identifiers: either macros defined by #define
 456    commands (type NT_MACRO), assertions created with #assert
 457    (NT_ASSERTION), or neither of the above (NT_VOID).  Builtin macros
 458    like __LINE__ are flagged NODE_BUILTIN.  Poisoned identifiers are
 459    flagged NODE_POISONED.  NODE_OPERATOR (C++ only) indicates an
 460    identifier that behaves like an operator such as "xor".
 461    NODE_DIAGNOSTIC is for speed in lex_token: it indicates a
 462    diagnostic may be required for this node.  Currently this only
 463    applies to __VA_ARGS__ and poisoned identifiers.  */
 464
 465 /* Hash node flags.  */
 466 #define NODE_OPERATOR   (1 << 0)        /* C++ named operator.  */
 467 #define NODE_POISONED   (1 << 1)        /* Poisoned identifier.  */
 468 #define NODE_BUILTIN    (1 << 2)        /* Builtin macro.  */
 469 #define NODE_DIAGNOSTIC (1 << 3)        /* Possible diagnostic when lexed.  */
 470 #define NODE_WARN       (1 << 4)        /* Warn if redefined or undefined.  */
 471 #define NODE_DISABLED   (1 << 5)        /* A disabled macro.  */
 472 #define NODE_MACRO_ARG  (1 << 6)        /* Used during #define processing.  */
 473
 474 /* Different flavors of hash node.  */
 475 enum node_type
 476 {
 477   NT_VOID = 0,     /* No definition yet.  */
 478   NT_MACRO,        /* A macro of some form.  */
 479   NT_ASSERTION     /* Predicate for #assert.  */
 480 };
 481
 482 /* Different flavors of builtin macro.  _Pragma is an operator, but we
 483    handle it with the builtin code for efficiency reasons.  */
 484 enum builtin_type
 485 {
 486   BT_SPECLINE = 0,              /* `__LINE__' */
 487   BT_DATE,                      /* `__DATE__' */
 488   BT_FILE,                      /* `__FILE__' */
 489   BT_BASE_FILE,                 /* `__BASE_FILE__' */
 490   BT_INCLUDE_LEVEL,             /* `__INCLUDE_LEVEL__' */
 491   BT_TIME,                      /* `__TIME__' */
 492   BT_STDC,                      /* `__STDC__' */
 493   BT_PRAGMA                     /* `_Pragma' operator */
 494 };
 495
 496 #define CPP_HASHNODE(HNODE)     ((cpp_hashnode *) (HNODE))
 497 #define HT_NODE(NODE)           ((ht_identifier *) (NODE))
 498 #define NODE_LEN(NODE)          HT_LEN (&(NODE)->ident)
 499 #define NODE_NAME(NODE)         HT_STR (&(NODE)->ident)
 500
 501 /* The common part of an identifier node shared amongst all 3 C front
 502    ends.  Also used to store CPP identifiers, which are a superset of
 503    identifiers in the grammatical sense.  */
 504 struct cpp_hashnode GTY(())
 505 {
 506   struct ht_identifier ident;
 507   unsigned int is_directive : 1;
 508   unsigned int directive_index : 7;     /* If is_directive,
 509                                            then index into directive table.
 510                                            Otherwise, a NODE_OPERATOR.  */
 511   unsigned char rid_code;               /* Rid code - for front ends.  */
 512   ENUM_BITFIELD(node_type) type : 8;    /* CPP node type.  */
 513   unsigned char flags;                  /* CPP flags.  */
 514
 515   union _cpp_hashnode_value
 516   {
 517     /* If a macro.  */
 518     cpp_macro * GTY((skip)) macro;
 519     /* Answers to an assertion.  */
 520     struct answer * GTY ((skip)) answers;
 521     /* Code for a builtin macro.  */
 522     enum builtin_type GTY ((tag ("1"))) builtin;
 523     /* Macro argument index.  */
 524     unsigned short GTY ((tag ("0"))) arg_index;
 525   } GTY ((desc ("0"))) value;
 526 };
 527
 528 /* Call this first to get a handle to pass to other functions.
 529
 530    If you want cpplib to manage its own hashtable, pass in a NULL
 531    pointer.  Otherwise you should pass in an initialized hash table
 532    that cpplib will share; this technique is used by the C front
 533    ends.  */
 534 extern cpp_reader *cpp_create_reader (enum c_lang, struct ht *,
 535                                       struct line_maps *);
 536
 537 /* Call this to change the selected language standard (e.g. because of
 538    command line options).  */
 539 extern void cpp_set_lang (cpp_reader *, enum c_lang);
 540
 541 /* Add a dependency TARGET.  Quote it for "make" if QUOTE.  Can be
 542    called any number of times before cpp_read_main_file().  If no
 543    targets have been added before cpp_read_main_file(), then the
 544    default target is used.  */
 545 extern void cpp_add_dependency_target (cpp_reader *, const char *, int);
 546
 547 /* Set the include paths.  */
 548 extern void cpp_set_include_chains (cpp_reader *, cpp_dir *, cpp_dir *, int);
 549
 550 /* Call these to get pointers to the options and callback structures
 551    for a given reader.  These pointers are good until you call
 552    cpp_finish on that reader.  You can either edit the callbacks
 553    through the pointer returned from cpp_get_callbacks, or set them
 554    with cpp_set_callbacks.  */
 555 extern cpp_options *cpp_get_options (cpp_reader *);
 556 extern cpp_callbacks *cpp_get_callbacks (cpp_reader *);
 557 extern void cpp_set_callbacks (cpp_reader *, cpp_callbacks *);
 558
 559 /* This function reads the file, but does not start preprocessing.  It
 560    returns the name of the original file; this is the same as the
 561    input file, except for preprocessed input.  This will generate at
 562    least one file change callback, and possibly a line change callback
 563    too.  If there was an error opening the file, it returns NULL.  */
 564 extern const char *cpp_read_main_file (cpp_reader *, const char *);
 565
 566 /* Set up built-ins like __FILE__.  */
 567 extern void cpp_init_builtins (cpp_reader *, int);
 568
 569 /* This is called after options have been parsed, and partially
 570    processed.  */
 571 extern void cpp_post_options (cpp_reader *);
 572
 573 /* Set up translation to the target character set.  */
 574 extern void cpp_init_iconv (cpp_reader *);
 575
 576 /* Call this to finish preprocessing.  If you requested dependency
 577    generation, pass an open stream to write the information to,
 578    otherwise NULL.  It is your responsibility to close the stream.
 579
 580    Returns cpp_errors (pfile).  */
 581 extern int cpp_finish (cpp_reader *, FILE *deps_stream);
 582
 583 /* Call this to release the handle at the end of preprocessing.  Any
 584    use of the handle after this function returns is invalid.  Returns
 585    cpp_errors (pfile).  */
 586 extern void cpp_destroy (cpp_reader *);
 587
 588 /* Error count.  */
 589 extern unsigned int cpp_errors (cpp_reader *);
 590
 591 extern unsigned int cpp_token_len (const cpp_token *);
 592 extern unsigned char *cpp_token_as_text (cpp_reader *, const cpp_token *);
 593 extern unsigned char *cpp_spell_token (cpp_reader *, const cpp_token *,
 594                                        unsigned char *);
 595 extern void cpp_register_pragma (cpp_reader *, const char *, const char *,
 596                                  void (*) (cpp_reader *));
 597 extern int cpp_avoid_paste (cpp_reader *, const cpp_token *,
 598                             const cpp_token *);
 599 extern const cpp_token *cpp_get_token (cpp_reader *);
 600 extern const unsigned char *cpp_macro_definition (cpp_reader *,
 601                                                   const cpp_hashnode *);
 602 extern void _cpp_backup_tokens (cpp_reader *, unsigned int);
 603
 604 /* Evaluate a CPP_CHAR or CPP_WCHAR token.  */
 605 extern cppchar_t cpp_interpret_charconst (cpp_reader *, const cpp_token *,
 606                                           unsigned int *, int *);
 607 /* Evaluate a vector of CPP_STRING or CPP_WSTRING tokens.  */
 608 extern bool cpp_interpret_string (cpp_reader *,
 609                                   const cpp_string *, size_t,
 610                                   cpp_string *, bool);
 611 extern bool cpp_interpret_string_notranslate (cpp_reader *,
 612                                               const cpp_string *, size_t,
 613                                               cpp_string *, bool);
 614
 615 /* Used to register macros and assertions, perhaps from the command line.
 616    The text is the same as the command line argument.  */
 617 extern void cpp_define (cpp_reader *, const char *);
 618 extern void cpp_assert (cpp_reader *, const char *);
 619 extern void cpp_undef (cpp_reader *, const char *);
 620 extern void cpp_unassert (cpp_reader *, const char *);
 621
 622 /* Undefine all macros and assertions.  */
 623 extern void cpp_undef_all (cpp_reader *);
 624
 625 extern cpp_buffer *cpp_push_buffer (cpp_reader *, const unsigned char *,
 626                                     size_t, int);
 627 extern int cpp_defined (cpp_reader *, const unsigned char *, int);
 628
 629 /* A preprocessing number.  Code assumes that any unused high bits of
 630    the double integer are set to zero.  */
 631 typedef unsigned HOST_WIDE_INT cpp_num_part;
 632 typedef struct cpp_num cpp_num;
 633 struct cpp_num
 634 {
 635   cpp_num_part high;
 636   cpp_num_part low;
 637   bool unsignedp;  /* True if value should be treated as unsigned.  */
 638   bool overflow;   /* True if the most recent calculation overflowed.  */
 639 };
 640
 641 /* cpplib provides two interfaces for interpretation of preprocessing
 642    numbers.
 643
 644    cpp_classify_number categorizes numeric constants according to
 645    their field (integer, floating point, or invalid), radix (decimal,
 646    octal, hexadecimal), and type suffixes.  */
 647
 648 #define CPP_N_CATEGORY  0x000F
 649 #define CPP_N_INVALID   0x0000
 650 #define CPP_N_INTEGER   0x0001
 651 #define CPP_N_FLOATING  0x0002
 652
 653 #define CPP_N_WIDTH     0x00F0
 654 #define CPP_N_SMALL     0x0010  /* int, float.  */
 655 #define CPP_N_MEDIUM    0x0020  /* long, double.  */
 656 #define CPP_N_LARGE     0x0040  /* long long, long double.  */
 657
 658 #define CPP_N_RADIX     0x0F00
 659 #define CPP_N_DECIMAL   0x0100
 660 #define CPP_N_HEX       0x0200
 661 #define CPP_N_OCTAL     0x0400
 662
 663 #define CPP_N_UNSIGNED  0x1000  /* Properties.  */
 664 #define CPP_N_IMAGINARY 0x2000
 665
 666 /* Classify a CPP_NUMBER token.  The return value is a combination of
 667    the flags from the above sets.  */
 668 extern unsigned cpp_classify_number (cpp_reader *, const cpp_token *);
 669
 670 /* Evaluate a token classified as category CPP_N_INTEGER.  */
 671 extern cpp_num cpp_interpret_integer (cpp_reader *, const cpp_token *,
 672                                       unsigned int type);
 673
 674 /* Sign extend a number, with PRECISION significant bits and all
 675    others assumed clear, to fill out a cpp_num structure.  */
 676 cpp_num cpp_num_sign_extend (cpp_num, size_t);
 677
 678 /* Diagnostic levels.  To get a diagnostic without associating a
 679    position in the translation unit with it, use cpp_error_with_line
 680    with a line number of zero.  */
 681
 682 /* Warning, an error with -Werror.  */
 683 #define CPP_DL_WARNING          0x00
 684 /* Same as CPP_DL_WARNING, except it is not suppressed in system headers.  */
 685 #define CPP_DL_WARNING_SYSHDR   0x01
 686 /* Warning, an error with -pedantic-errors or -Werror.  */
 687 #define CPP_DL_PEDWARN          0x02
 688 /* An error.  */
 689 #define CPP_DL_ERROR            0x03
 690 /* An internal consistency check failed.  Prints "internal error: ",
 691    otherwise the same as CPP_DL_ERROR.  */
 692 #define CPP_DL_ICE              0x04
 693 /* Extracts a diagnostic level from an int.  */
 694 #define CPP_DL_EXTRACT(l)       (l & 0xf)
 695 /* Nonzero if a diagnostic level is one of the warnings.  */
 696 #define CPP_DL_WARNING_P(l)     (CPP_DL_EXTRACT (l) >= CPP_DL_WARNING \
 697                                  && CPP_DL_EXTRACT (l) <= CPP_DL_PEDWARN)
 698
 699 /* N.B. The error-message-printer prototypes have not been nicely
 700    formatted because exgettext needs to see 'msgid' on the same line
 701    as the name of the function in order to work properly.  Only the
 702    string argument gets a name in an effort to keep the lines from
 703    getting ridiculously oversized.  */
 704
 705 /* Output a diagnostic of some kind.  */
 706 extern void cpp_error (cpp_reader *, int, const char *msgid, ...)
 707   ATTRIBUTE_PRINTF_3;
 708
 709 /* Output a diagnostic with "MSGID: " preceding the
 710    error string of errno.  No location is printed.  */
 711 extern void cpp_errno (cpp_reader *, int, const char *msgid);
 712
 713 /* Same as cpp_error, except additionally specifies a position as a
 714    (translation unit) physical line and physical column.  If the line is
 715    zero, then no location is printed.  */
 716 extern void cpp_error_with_line (cpp_reader *, int, source_location, unsigned,
 717                                  const char *msgid, ...) ATTRIBUTE_PRINTF_5;
 718
 719 /* In cpplex.c */
 720 extern int cpp_ideq (const cpp_token *, const char *);
 721 extern void cpp_output_line (cpp_reader *, FILE *);
 722 extern void cpp_output_token (const cpp_token *, FILE *);
 723 extern const char *cpp_type2name (enum cpp_ttype);
 724 /* Returns the value of an escape sequence, truncated to the correct
 725    target precision.  PSTR points to the input pointer, which is just
 726    after the backslash.  LIMIT is how much text we have.  WIDE is true
 727    if the escape sequence is part of a wide character constant or
 728    string literal.  Handles all relevant diagnostics.  */
 729 extern cppchar_t cpp_parse_escape (cpp_reader *, const unsigned char ** pstr,
 730                                    const unsigned char *limit, int wide);
 731
 732 /* In cpphash.c */
 733
 734 /* Lookup an identifier in the hashtable.  Puts the identifier in the
 735    table if it is not already there.  */
 736 extern cpp_hashnode *cpp_lookup (cpp_reader *, const unsigned char *,
 737                                  unsigned int);
 738
 739 typedef int (*cpp_cb) (cpp_reader *, cpp_hashnode *, void *);
 740 extern void cpp_forall_identifiers (cpp_reader *, cpp_cb, void *);
 741
 742 /* In cppmacro.c */
 743 extern void cpp_scan_nooutput (cpp_reader *);
 744 extern int  cpp_sys_macro_p (cpp_reader *);
 745 extern unsigned char *cpp_quote_string (unsigned char *, const unsigned char *,
 746                                         unsigned int);
 747
 748 /* In cppfiles.c */
 749 extern bool cpp_included (cpp_reader *, const char *);
 750 extern void cpp_make_system_header (cpp_reader *, int, int);
 751 extern bool cpp_push_include (cpp_reader *, const char *);
 752 extern void cpp_change_file (cpp_reader *, enum lc_reason, const char *);
 753 extern const char *cpp_get_path (struct _cpp_file *);
 754 extern cpp_dir *cpp_get_dir (struct _cpp_file *);
 755 extern cpp_buffer *cpp_get_buffer (cpp_reader *);
 756 extern struct _cpp_file *cpp_get_file (cpp_buffer *);
 757 extern cpp_buffer *cpp_get_prev (cpp_buffer *);
 758
 759 /* In cpppch.c */
 760 struct save_macro_data;
 761 extern int cpp_save_state (cpp_reader *, FILE *);
 762 extern int cpp_write_pch_deps (cpp_reader *, FILE *);
 763 extern int cpp_write_pch_state (cpp_reader *, FILE *);
 764 extern int cpp_valid_state (cpp_reader *, const char *, int);
 765 extern void cpp_prepare_state (cpp_reader *, struct save_macro_data **);
 766 extern int cpp_read_state (cpp_reader *, const char *, FILE *,
 767                            struct save_macro_data *);
 768
 769 #ifdef __cplusplus
 770 }
 771 #endif
 772
 773 #endif /* ! GCC_CPPLIB_H */