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
 386   /* Called when switching to/from a new file.
 387      The line_map is for the new file.  It is NULL if there is no new file.
 388      (In C this happens when done with <built-in>+<command line> and also
 389      when done with a main file.)  This can be used for resource cleanup.  */
 390   void (*file_change) (cpp_reader *, const struct line_map *);
 391
 392   void (*dir_change) (cpp_reader *, const char *);
 393   void (*include) (cpp_reader *, unsigned int, const unsigned char *,
 394                    const char *, int);
 395   void (*define) (cpp_reader *, unsigned int, cpp_hashnode *);
 396   void (*undef) (cpp_reader *, unsigned int, cpp_hashnode *);
 397   void (*ident) (cpp_reader *, unsigned int, const cpp_string *);
 398   void (*def_pragma) (cpp_reader *, unsigned int);
 399   int (*valid_pch) (cpp_reader *, const char *, int);
 400   void (*read_pch) (cpp_reader *, const char *, int, const char *);
 401 };
 402
 403 /* Chain of directories to look for include files in.  */
 404 struct cpp_dir
 405 {
 406   /* NULL-terminated singly-linked list.  */
 407   struct cpp_dir *next;
 408
 409   /* NAME of the directory, NUL-terminated.  */
 410   char *name;
 411   unsigned int len;
 412
 413   /* One if a system header, two if a system header that has extern
 414      "C" guards for C++.  */
 415   unsigned char sysp;
 416
 417   /* Mapping of file names for this directory for MS-DOS and related
 418      platforms.  A NULL-terminated array of (from, to) pairs.  */
 419   const char **name_map;
 420
 421   /* The C front end uses these to recognize duplicated
 422      directories in the search path.  */
 423   ino_t ino;
 424   dev_t dev;
 425 };
 426
 427 /* Name under which this program was invoked.  */
 428 extern const char *progname;
 429
 430 /* The structure of a node in the hash table.  The hash table has
 431    entries for all identifiers: either macros defined by #define
 432    commands (type NT_MACRO), assertions created with #assert
 433    (NT_ASSERTION), or neither of the above (NT_VOID).  Builtin macros
 434    like __LINE__ are flagged NODE_BUILTIN.  Poisoned identifiers are
 435    flagged NODE_POISONED.  NODE_OPERATOR (C++ only) indicates an
 436    identifier that behaves like an operator such as "xor".
 437    NODE_DIAGNOSTIC is for speed in lex_token: it indicates a
 438    diagnostic may be required for this node.  Currently this only
 439    applies to __VA_ARGS__ and poisoned identifiers.  */
 440
 441 /* Hash node flags.  */
 442 #define NODE_OPERATOR   (1 << 0)        /* C++ named operator.  */
 443 #define NODE_POISONED   (1 << 1)        /* Poisoned identifier.  */
 444 #define NODE_BUILTIN    (1 << 2)        /* Builtin macro.  */
 445 #define NODE_DIAGNOSTIC (1 << 3)        /* Possible diagnostic when lexed.  */
 446 #define NODE_WARN       (1 << 4)        /* Warn if redefined or undefined.  */
 447 #define NODE_DISABLED   (1 << 5)        /* A disabled macro.  */
 448 #define NODE_MACRO_ARG  (1 << 6)        /* Used during #define processing.  */
 449
 450 /* Different flavors of hash node.  */
 451 enum node_type
 452 {
 453   NT_VOID = 0,     /* No definition yet.  */
 454   NT_MACRO,        /* A macro of some form.  */
 455   NT_ASSERTION     /* Predicate for #assert.  */
 456 };
 457
 458 /* Different flavors of builtin macro.  _Pragma is an operator, but we
 459    handle it with the builtin code for efficiency reasons.  */
 460 enum builtin_type
 461 {
 462   BT_SPECLINE = 0,              /* `__LINE__' */
 463   BT_DATE,                      /* `__DATE__' */
 464   BT_FILE,                      /* `__FILE__' */
 465   BT_BASE_FILE,                 /* `__BASE_FILE__' */
 466   BT_INCLUDE_LEVEL,             /* `__INCLUDE_LEVEL__' */
 467   BT_TIME,                      /* `__TIME__' */
 468   BT_STDC,                      /* `__STDC__' */
 469   BT_PRAGMA                     /* `_Pragma' operator */
 470 };
 471
 472 #define CPP_HASHNODE(HNODE)     ((cpp_hashnode *) (HNODE))
 473 #define HT_NODE(NODE)           ((ht_identifier *) (NODE))
 474 #define NODE_LEN(NODE)          HT_LEN (&(NODE)->ident)
 475 #define NODE_NAME(NODE)         HT_STR (&(NODE)->ident)
 476
 477 /* The common part of an identifier node shared amongst all 3 C front
 478    ends.  Also used to store CPP identifiers, which are a superset of
 479    identifiers in the grammatical sense.  */
 480 struct cpp_hashnode GTY(())
 481 {
 482   struct ht_identifier ident;
 483   unsigned int is_directive : 1;
 484   unsigned int directive_index : 7;     /* If is_directive,
 485                                            then index into directive table.
 486                                            Otherwise, a NODE_OPERATOR.  */
 487   unsigned char rid_code;               /* Rid code - for front ends.  */
 488   ENUM_BITFIELD(node_type) type : 8;    /* CPP node type.  */
 489   unsigned char flags;                  /* CPP flags.  */
 490
 491   union _cpp_hashnode_value
 492   {
 493     /* If a macro.  */
 494     cpp_macro * GTY((skip (""))) macro;
 495     /* Answers to an assertion.  */
 496     struct answer * GTY ((skip (""))) answers;
 497     /* Code for a builtin macro.  */
 498     enum builtin_type GTY ((tag ("1"))) builtin;
 499     /* Macro argument index.  */
 500     unsigned short GTY ((tag ("0"))) arg_index;
 501   } GTY ((desc ("0"))) value;
 502 };
 503
 504 /* Call this first to get a handle to pass to other functions.
 505
 506    If you want cpplib to manage its own hashtable, pass in a NULL
 507    pointer.  Otherwise you should pass in an initialized hash table
 508    that cpplib will share; this technique is used by the C front
 509    ends.  */
 510 extern cpp_reader *cpp_create_reader (enum c_lang, struct ht *);
 511
 512 /* Call this to change the selected language standard (e.g. because of
 513    command line options).  */
 514 extern void cpp_set_lang (cpp_reader *, enum c_lang);
 515
 516 /* Add a dependency TARGET.  Quote it for "make" if QUOTE.  Can be
 517    called any number of times before cpp_read_main_file().  If no
 518    targets have been added before cpp_read_main_file(), then the
 519    default target is used.  */
 520 extern void cpp_add_dependency_target (cpp_reader *, const char *, int);
 521
 522 /* Set the include paths.  */
 523 extern void cpp_set_include_chains (cpp_reader *, cpp_dir *, cpp_dir *, int);
 524
 525 /* Call these to get pointers to the options and callback structures
 526    for a given reader.  These pointers are good until you call
 527    cpp_finish on that reader.  You can either edit the callbacks
 528    through the pointer returned from cpp_get_callbacks, or set them
 529    with cpp_set_callbacks.  */
 530 extern cpp_options *cpp_get_options (cpp_reader *);
 531 extern const struct line_maps *cpp_get_line_maps (cpp_reader *);
 532 extern cpp_callbacks *cpp_get_callbacks (cpp_reader *);
 533 extern void cpp_set_callbacks (cpp_reader *, cpp_callbacks *);
 534
 535 /* This function finds the main file, but does not start reading it.
 536    Returns true iff the file was found.  */
 537 extern bool cpp_find_main_file (cpp_reader *, const char *);
 538
 539 /* This function reads the file, but does not start preprocessing.
 540    This will generate at least one file change callback, and possibly
 541    a line change callback.  */
 542 extern void cpp_push_main_file (cpp_reader *);
 543
 544 /* Set up built-ins like __FILE__.  */
 545 extern void cpp_init_builtins (cpp_reader *, int);
 546
 547 /* This is called after options have been parsed, and partially
 548    processed.  */
 549 extern void cpp_post_options (cpp_reader *);
 550
 551 /* Set up translation to the target character set.  */
 552 extern void cpp_init_iconv (cpp_reader *);
 553
 554 /* Call this to finish preprocessing.  If you requested dependency
 555    generation, pass an open stream to write the information to,
 556    otherwise NULL.  It is your responsibility to close the stream.
 557
 558    Returns cpp_errors (pfile).  */
 559 extern int cpp_finish (cpp_reader *, FILE *deps_stream);
 560
 561 /* Call this to release the handle at the end of preprocessing.  Any
 562    use of the handle after this function returns is invalid.  Returns
 563    cpp_errors (pfile).  */
 564 extern void cpp_destroy (cpp_reader *);
 565
 566 /* Error count.  */
 567 extern unsigned int cpp_errors (cpp_reader *);
 568
 569 extern unsigned int cpp_token_len (const cpp_token *);
 570 extern unsigned char *cpp_token_as_text (cpp_reader *, const cpp_token *);
 571 extern unsigned char *cpp_spell_token (cpp_reader *, const cpp_token *,
 572                                        unsigned char *);
 573 extern void cpp_register_pragma (cpp_reader *, const char *, const char *,
 574                                  void (*) (cpp_reader *));
 575 extern int cpp_avoid_paste (cpp_reader *, const cpp_token *,
 576                             const cpp_token *);
 577 extern const cpp_token *cpp_get_token (cpp_reader *);
 578 extern const unsigned char *cpp_macro_definition (cpp_reader *,
 579                                                   const cpp_hashnode *);
 580 extern void _cpp_backup_tokens (cpp_reader *, unsigned int);
 581
 582 /* Evaluate a CPP_CHAR or CPP_WCHAR token.  */
 583 extern cppchar_t cpp_interpret_charconst (cpp_reader *, const cpp_token *,
 584                                           unsigned int *, int *);
 585 /* Evaluate a vector of CPP_STRING or CPP_WSTRING tokens.  */
 586 extern bool cpp_interpret_string (cpp_reader *,
 587                                   const cpp_string *, size_t,
 588                                   cpp_string *, bool);
 589
 590 /* Used to register macros and assertions, perhaps from the command line.
 591    The text is the same as the command line argument.  */
 592 extern void cpp_define (cpp_reader *, const char *);
 593 extern void cpp_assert (cpp_reader *, const char *);
 594 extern void cpp_undef (cpp_reader *, const char *);
 595 extern void cpp_unassert (cpp_reader *, const char *);
 596
 597 /* Undefine all macros and assertions.  */
 598 extern void cpp_undef_all (cpp_reader *);
 599
 600 extern cpp_buffer *cpp_push_buffer (cpp_reader *, const unsigned char *,
 601                                     size_t, int);
 602 extern int cpp_defined (cpp_reader *, const unsigned char *, int);
 603
 604 /* A preprocessing number.  Code assumes that any unused high bits of
 605    the double integer are set to zero.  */
 606 typedef unsigned HOST_WIDE_INT cpp_num_part;
 607 typedef struct cpp_num cpp_num;
 608 struct cpp_num
 609 {
 610   cpp_num_part high;
 611   cpp_num_part low;
 612   bool unsignedp;  /* True if value should be treated as unsigned.  */
 613   bool overflow;   /* True if the most recent calculation overflowed.  */
 614 };
 615
 616 /* cpplib provides two interfaces for interpretation of preprocessing
 617    numbers.
 618
 619    cpp_classify_number categorizes numeric constants according to
 620    their field (integer, floating point, or invalid), radix (decimal,
 621    octal, hexadecimal), and type suffixes.  */
 622
 623 #define CPP_N_CATEGORY  0x000F
 624 #define CPP_N_INVALID   0x0000
 625 #define CPP_N_INTEGER   0x0001
 626 #define CPP_N_FLOATING  0x0002
 627
 628 #define CPP_N_WIDTH     0x00F0
 629 #define CPP_N_SMALL     0x0010  /* int, float.  */
 630 #define CPP_N_MEDIUM    0x0020  /* long, double.  */
 631 #define CPP_N_LARGE     0x0040  /* long long, long double.  */
 632
 633 #define CPP_N_RADIX     0x0F00
 634 #define CPP_N_DECIMAL   0x0100
 635 #define CPP_N_HEX       0x0200
 636 #define CPP_N_OCTAL     0x0400
 637
 638 #define CPP_N_UNSIGNED  0x1000  /* Properties.  */
 639 #define CPP_N_IMAGINARY 0x2000
 640
 641 /* Classify a CPP_NUMBER token.  The return value is a combination of
 642    the flags from the above sets.  */
 643 extern unsigned cpp_classify_number (cpp_reader *, const cpp_token *);
 644
 645 /* Evaluate a token classified as category CPP_N_INTEGER.  */
 646 extern cpp_num cpp_interpret_integer (cpp_reader *, const cpp_token *,
 647                                       unsigned int type);
 648
 649 /* Sign extend a number, with PRECISION significant bits and all
 650    others assumed clear, to fill out a cpp_num structure.  */
 651 cpp_num cpp_num_sign_extend (cpp_num, size_t);
 652
 653 /* Diagnostic levels.  To get a diagnostic without associating a
 654    position in the translation unit with it, use cpp_error_with_line
 655    with a line number of zero.  */
 656
 657 /* Warning, an error with -Werror.  */
 658 #define CPP_DL_WARNING          0x00
 659 /* Same as CPP_DL_WARNING, except it is not suppressed in system headers.  */
 660 #define CPP_DL_WARNING_SYSHDR   0x01
 661 /* Warning, an error with -pedantic-errors or -Werror.  */
 662 #define CPP_DL_PEDWARN          0x02
 663 /* An error.  */
 664 #define CPP_DL_ERROR            0x03
 665 /* An internal consistency check failed.  Prints "internal error: ",
 666    otherwise the same as CPP_DL_ERROR.  */
 667 #define CPP_DL_ICE              0x04
 668 /* Extracts a diagnostic level from an int.  */
 669 #define CPP_DL_EXTRACT(l)       (l & 0xf)
 670 /* Nonzero if a diagnostic level is one of the warnings.  */
 671 #define CPP_DL_WARNING_P(l)     (CPP_DL_EXTRACT (l) >= CPP_DL_WARNING \
 672                                  && CPP_DL_EXTRACT (l) <= CPP_DL_PEDWARN)
 673
 674 /* N.B. The error-message-printer prototypes have not been nicely
 675    formatted because exgettext needs to see 'msgid' on the same line
 676    as the name of the function in order to work properly.  Only the
 677    string argument gets a name in an effort to keep the lines from
 678    getting ridiculously oversized.  */
 679
 680 /* Output a diagnostic of some kind.  */
 681 extern void cpp_error (cpp_reader *, int, const char *msgid, ...)
 682   ATTRIBUTE_PRINTF_3;
 683
 684 /* Output a diagnostic with "MSGID: " preceding the
 685    error string of errno.  No location is printed.  */
 686 extern void cpp_errno (cpp_reader *, int, const char *msgid);
 687
 688 /* Same as cpp_error, except additionally specifies a position as a
 689    (translation unit) physical line and physical column.  If the line is
 690    zero, then no location is printed.  */
 691 extern void cpp_error_with_line (cpp_reader *, int, fileline, unsigned,
 692                                  const char *msgid, ...) ATTRIBUTE_PRINTF_5;
 693
 694 /* In cpplex.c */
 695 extern int cpp_ideq (const cpp_token *, const char *);
 696 extern void cpp_output_line (cpp_reader *, FILE *);
 697 extern void cpp_output_token (const cpp_token *, FILE *);
 698 extern const char *cpp_type2name (enum cpp_ttype);
 699 /* Returns the value of an escape sequence, truncated to the correct
 700    target precision.  PSTR points to the input pointer, which is just
 701    after the backslash.  LIMIT is how much text we have.  WIDE is true
 702    if the escape sequence is part of a wide character constant or
 703    string literal.  Handles all relevant diagnostics.  */
 704 extern cppchar_t cpp_parse_escape (cpp_reader *, const unsigned char ** pstr,
 705                                    const unsigned char *limit, int wide);
 706
 707 /* In cpphash.c */
 708
 709 /* Lookup an identifier in the hashtable.  Puts the identifier in the
 710    table if it is not already there.  */
 711 extern cpp_hashnode *cpp_lookup (cpp_reader *, const unsigned char *,
 712                                  unsigned int);
 713
 714 typedef int (*cpp_cb) (cpp_reader *, cpp_hashnode *, void *);
 715 extern void cpp_forall_identifiers (cpp_reader *, cpp_cb, void *);
 716
 717 /* In cppmacro.c */
 718 extern void cpp_scan_nooutput (cpp_reader *);
 719 extern int  cpp_sys_macro_p (cpp_reader *);
 720 extern unsigned char *cpp_quote_string (unsigned char *, const unsigned char *,
 721                                         unsigned int);
 722
 723 /* In cppfiles.c */
 724 extern bool cpp_included (cpp_reader *, const char *);
 725 extern void cpp_make_system_header (cpp_reader *, int, int);
 726 extern bool cpp_push_include (cpp_reader *, const char *);
 727 extern void cpp_change_file (cpp_reader *, enum lc_reason, const char *);
 728
 729 /* In cpppch.c */
 730 struct save_macro_data;
 731 extern int cpp_save_state (cpp_reader *, FILE *);
 732 extern int cpp_write_pch_deps (cpp_reader *, FILE *);
 733 extern int cpp_write_pch_state (cpp_reader *, FILE *);
 734 extern int cpp_valid_state (cpp_reader *, const char *, int);
 735 extern void cpp_prepare_state (cpp_reader *, struct save_macro_data **);
 736 extern int cpp_read_state (cpp_reader *, const char *, FILE *,
 737                            struct save_macro_data *);
 738
 739 #ifdef __cplusplus
 740 }
 741 #endif
 742
 743 #endif /* ! GCC_CPPLIB_H */