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
  43 struct answer;
  44 struct file_name_map_list;
  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_NUMBER,        SPELL_NUMBER)   /* 34_be+ta  */                 \
 127 \
 128   TK(CPP_CHAR,          SPELL_STRING)   /* 'char' */                    \
 129   TK(CPP_WCHAR,         SPELL_STRING)   /* L'char' */                   \
 130   TK(CPP_OTHER,         SPELL_CHAR)     /* stray punctuation */         \
 131 \
 132   TK(CPP_STRING,        SPELL_STRING)   /* "string" */                  \
 133   TK(CPP_WSTRING,       SPELL_STRING)   /* L"string" */                 \
 134   TK(CPP_HEADER_NAME,   SPELL_STRING)   /* <stdio.h> in #include */     \
 135 \
 136   TK(CPP_COMMENT,       SPELL_NUMBER)   /* Only if output comments.  */ \
 137                                         /* SPELL_NUMBER happens to DTRT.  */ \
 138   TK(CPP_MACRO_ARG,     SPELL_NONE)     /* Macro argument.  */          \
 139   TK(CPP_PADDING,       SPELL_NONE)     /* Whitespace for cpp0.  */
 140
 141 #define OP(e, s) e,
 142 #define TK(e, s) e,
 143 enum cpp_ttype
 144 {
 145   TTYPE_TABLE
 146   N_TTYPES
 147 };
 148 #undef OP
 149 #undef TK
 150
 151 /* C language kind, used when calling cpp_reader_init.  */
 152 enum c_lang {CLK_GNUC89 = 0, CLK_GNUC99, CLK_STDC89, CLK_STDC94, CLK_STDC99,
 153              CLK_GNUCXX, CLK_CXX98, CLK_ASM};
 154
 155 /* Payload of a NUMBER, STRING, CHAR or COMMENT token.  */
 156 struct cpp_string
 157 {
 158   unsigned int len;
 159   const unsigned char *text;
 160 };
 161
 162 /* Flags for the cpp_token structure.  */
 163 #define PREV_WHITE      (1 << 0) /* If whitespace before this token.  */
 164 #define DIGRAPH         (1 << 1) /* If it was a digraph.  */
 165 #define STRINGIFY_ARG   (1 << 2) /* If macro argument to be stringified.  */
 166 #define PASTE_LEFT      (1 << 3) /* If on LHS of a ## operator.  */
 167 #define NAMED_OP        (1 << 4) /* C++ named operators.  */
 168 #define NO_EXPAND       (1 << 5) /* Do not macro-expand this token.  */
 169 #define BOL             (1 << 6) /* Token at beginning of line.  */
 170
 171 /* A preprocessing token.  This has been carefully packed and should
 172    occupy 16 bytes on 32-bit hosts and 24 bytes on 64-bit hosts.  */
 173 struct cpp_token
 174 {
 175   unsigned int line;            /* Logical line of first char of token.  */
 176   unsigned short col;           /* Column of first char of token.  */
 177   ENUM_BITFIELD(cpp_ttype) type : CHAR_BIT;  /* token type */
 178   unsigned char flags;          /* flags - see above */
 179
 180   union
 181   {
 182     cpp_hashnode *node;         /* An identifier.  */
 183     const cpp_token *source;    /* Inherit padding from this token.  */
 184     struct cpp_string str;      /* A string, or number.  */
 185     unsigned int arg_no;        /* Argument no. for a CPP_MACRO_ARG.  */
 186     unsigned char c;            /* Character represented by CPP_OTHER.  */
 187   } val;
 188 };
 189
 190 /* A type wide enough to hold any multibyte source character.
 191    cpplib's character constant interpreter requires an unsigned type.
 192    Also, a typedef for the signed equivalent.  */
 193 #ifndef MAX_WCHAR_TYPE_SIZE
 194 # define MAX_WCHAR_TYPE_SIZE WCHAR_TYPE_SIZE
 195 #endif
 196 #if CHAR_BIT * SIZEOF_INT >= MAX_WCHAR_TYPE_SIZE
 197 # define CPPCHAR_SIGNED_T int
 198 #else
 199 # if CHAR_BIT * SIZEOF_LONG >= MAX_WCHAR_TYPE_SIZE || !HAVE_LONG_LONG
 200 #  define CPPCHAR_SIGNED_T long
 201 # else
 202 #  define CPPCHAR_SIGNED_T long long
 203 # endif
 204 #endif
 205 typedef unsigned CPPCHAR_SIGNED_T cppchar_t;
 206 typedef CPPCHAR_SIGNED_T cppchar_signed_t;
 207
 208 /* Values for opts.dump_macros.
 209   dump_only means inhibit output of the preprocessed text
 210              and instead output the definitions of all user-defined
 211              macros in a form suitable for use as input to cpp.
 212    dump_names means pass #define and the macro name through to output.
 213    dump_definitions means pass the whole definition (plus #define) through
 214 */
 215 enum { dump_none = 0, dump_only, dump_names, dump_definitions };
 216
 217 /* This structure is nested inside struct cpp_reader, and
 218    carries all the options visible to the command line.  */
 219 struct cpp_options
 220 {
 221   /* Characters between tab stops.  */
 222   unsigned int tabstop;
 223
 224   /* Pending options - -D, -U, -A, -I, -ixxx.  */
 225   struct cpp_pending *pending;
 226
 227   /* Search paths for include files.  */
 228   struct search_path *quote_include;    /* "" */
 229   struct search_path *bracket_include;  /* <> */
 230
 231   /* Map between header names and file names, used only on DOS where
 232      file names are limited in length.  */
 233   struct file_name_map_list *map_list;
 234
 235   /* Directory prefix that should replace `/usr/lib/gcc-lib/TARGET/VERSION'
 236      in the standard include file directories.  */
 237   const char *include_prefix;
 238   unsigned int include_prefix_len;
 239
 240   /* The language we're preprocessing.  */
 241   enum c_lang lang;
 242
 243   /* Non-0 means -v, so print the full set of include dirs.  */
 244   unsigned char verbose;
 245
 246   /* Nonzero means use extra default include directories for C++.  */
 247   unsigned char cplusplus;
 248
 249   /* Nonzero means handle cplusplus style comments */
 250   unsigned char cplusplus_comments;
 251
 252   /* Nonzero means define __OBJC__, treat @ as a special token, and
 253      use the OBJC[PLUS]_INCLUDE_PATH environment variable.  */
 254   unsigned char objc;
 255
 256   /* Nonzero means don't copy comments into the output file.  */
 257   unsigned char discard_comments;
 258
 259   /* Nonzero means don't copy comments into the output file during
 260      macro expansion.  */
 261   unsigned char discard_comments_in_macro_exp;
 262
 263   /* Nonzero means process the ISO trigraph sequences.  */
 264   unsigned char trigraphs;
 265
 266   /* Nonzero means process the ISO digraph sequences.  */
 267   unsigned char digraphs;
 268
 269   /* Nonzero means to allow hexadecimal floats and LL suffixes.  */
 270   unsigned char extended_numbers;
 271
 272   /* Nonzero means print names of header files (-H).  */
 273   unsigned char print_include_names;
 274
 275   /* Nonzero means cpp_pedwarn causes a hard error.  */
 276   unsigned char pedantic_errors;
 277
 278   /* Nonzero means don't print warning messages.  */
 279   unsigned char inhibit_warnings;
 280
 281   /* Nonzero means complain about deprecated features.  */
 282   unsigned char warn_deprecated;
 283
 284   /* Nonzero means don't suppress warnings from system headers.  */
 285   unsigned char warn_system_headers;
 286
 287   /* Nonzero means don't print error messages.  Has no option to
 288      select it, but can be set by a user of cpplib (e.g. fix-header).  */
 289   unsigned char inhibit_errors;
 290
 291   /* Nonzero means warn if slash-star appears in a comment.  */
 292   unsigned char warn_comments;
 293
 294   /* Nonzero means warn if there are any trigraphs.  */
 295   unsigned char warn_trigraphs;
 296
 297   /* Nonzero means warn if #import is used.  */
 298   unsigned char warn_import;
 299
 300   /* Nonzero means warn about multicharacter charconsts.  */
 301   unsigned char warn_multichar;
 302
 303   /* Nonzero means warn about various incompatibilities with
 304      traditional C.  */
 305   unsigned char warn_traditional;
 306
 307   /* Nonzero means warn about long long numeric constants.  */
 308   unsigned char warn_long_long;
 309
 310   /* Nonzero means warn about text after an #endif (or #else).  */
 311   unsigned char warn_endif_labels;
 312
 313   /* Nonzero means warn about implicit sign changes owing to integer
 314      promotions.  */
 315   unsigned char warn_num_sign_change;
 316
 317   /* Nonzero means turn warnings into errors.  */
 318   unsigned char warnings_are_errors;
 319
 320   /* Nonzero causes output not to be done, but directives such as
 321      #define that have side effects are still obeyed.  */
 322   unsigned char no_output;
 323
 324   /* Nonzero means we should look for header.gcc files that remap file
 325      names.  */
 326   unsigned char remap;
 327
 328   /* Nonzero means don't output line number information.  */
 329   unsigned char no_line_commands;
 330
 331   /* Nonzero means -I- has been seen, so don't look for #include "foo"
 332      the source-file directory.  */
 333   unsigned char ignore_srcdir;
 334
 335   /* Zero means dollar signs are punctuation.  */
 336   unsigned char dollars_in_ident;
 337
 338   /* Nonzero means warn if undefined identifiers are evaluated in an #if.  */
 339   unsigned char warn_undef;
 340
 341   /* Nonzero means warn of unused macros from the main file.  */
 342   unsigned char warn_unused_macros;
 343
 344   /* Nonzero for the 1999 C Standard, including corrigenda and amendments.  */
 345   unsigned char c99;
 346
 347   /* Nonzero if we are conforming to a specific C or C++ standard.  */
 348   unsigned char std;
 349
 350   /* Nonzero means give all the error messages the ANSI standard requires.  */
 351   unsigned char pedantic;
 352
 353   /* Nonzero means we're looking at already preprocessed code, so don't
 354      bother trying to do macro expansion and whatnot.  */
 355   unsigned char preprocessed;
 356
 357   /* Nonzero disables all the standard directories for headers.  */
 358   unsigned char no_standard_includes;
 359
 360   /* Nonzero disables the C++-specific standard directories for headers.  */
 361   unsigned char no_standard_cplusplus_includes;
 362
 363   /* Nonzero means dump macros in some fashion - see above.  */
 364   unsigned char dump_macros;
 365
 366   /* Nonzero means pass #include lines through to the output.  */
 367   unsigned char dump_includes;
 368
 369   /* Print column number in error messages.  */
 370   unsigned char show_column;
 371
 372   /* Nonzero means handle C++ alternate operator names.  */
 373   unsigned char operator_names;
 374
 375   /* True for traditional preprocessing.  */
 376   unsigned char traditional;
 377
 378   /* Dependency generation.  */
 379   struct
 380   {
 381     /* Style of header dependencies to generate.  */
 382     enum {DEPS_NONE = 0, DEPS_USER, DEPS_SYSTEM } style;
 383
 384     /* Assume missing files are generated files.  */
 385     bool missing_files;
 386
 387     /* Generate phony targets for each dependency apart from the first
 388        one.  */
 389     bool phony_targets;
 390
 391     /* If true, no dependency is generated on the main file.  */
 392     bool ignore_main_file;
 393   } deps;
 394
 395   /* Target-specific features set by the front end or client.  */
 396
 397   /* Precision for target CPP arithmetic, target characters, target
 398      ints and target wide characters, respectively.  */
 399   size_t precision, char_precision, int_precision, wchar_precision;
 400
 401   /* True means chars (wide chars) are unsigned.  */
 402   bool unsigned_char, unsigned_wchar;
 403
 404   /* Nonzero means __STDC__ should have the value 0 in system headers.  */
 405   unsigned char stdc_0_in_system_headers;
 406
 407   /* True to warn about precompiled header files we couldn't use.  */
 408   bool warn_invalid_pch;
 409
 410   /* True if dependencies should be restored from a precompiled header.  */
 411   bool restore_pch_deps;
 412 };
 413
 414 /* Call backs.  */
 415 struct cpp_callbacks
 416 {
 417   /* Called when a new line of preprocessed output is started.  */
 418   void (*line_change) PARAMS ((cpp_reader *, const cpp_token *, int));
 419   void (*file_change) PARAMS ((cpp_reader *, const struct line_map *));
 420   void (*include) PARAMS ((cpp_reader *, unsigned int,
 421                            const unsigned char *, const cpp_token *));
 422   void (*define) PARAMS ((cpp_reader *, unsigned int, cpp_hashnode *));
 423   void (*undef) PARAMS ((cpp_reader *, unsigned int, cpp_hashnode *));
 424   void (*ident) PARAMS ((cpp_reader *, unsigned int, const cpp_string *));
 425   void (*def_pragma) PARAMS ((cpp_reader *, unsigned int));
 426   /* Called when the client has a chance to properly register
 427      built-ins with cpp_define() and cpp_assert().  */
 428   void (*register_builtins) PARAMS ((cpp_reader *));
 429   int (*valid_pch) PARAMS ((cpp_reader *, const char *, int));
 430   void (*read_pch) PARAMS ((cpp_reader *, const char *, int, const char *));
 431 };
 432
 433 /* Name under which this program was invoked.  */
 434 extern const char *progname;
 435
 436 /* The structure of a node in the hash table.  The hash table has
 437    entries for all identifiers: either macros defined by #define
 438    commands (type NT_MACRO), assertions created with #assert
 439    (NT_ASSERTION), or neither of the above (NT_VOID).  Builtin macros
 440    like __LINE__ are flagged NODE_BUILTIN.  Poisoned identifiers are
 441    flagged NODE_POISONED.  NODE_OPERATOR (C++ only) indicates an
 442    identifier that behaves like an operator such as "xor".
 443    NODE_DIAGNOSTIC is for speed in lex_token: it indicates a
 444    diagnostic may be required for this node.  Currently this only
 445    applies to __VA_ARGS__ and poisoned identifiers.  */
 446
 447 /* Hash node flags.  */
 448 #define NODE_OPERATOR   (1 << 0)        /* C++ named operator.  */
 449 #define NODE_POISONED   (1 << 1)        /* Poisoned identifier.  */
 450 #define NODE_BUILTIN    (1 << 2)        /* Builtin macro.  */
 451 #define NODE_DIAGNOSTIC (1 << 3)        /* Possible diagnostic when lexed.  */
 452 #define NODE_WARN       (1 << 4)        /* Warn if redefined or undefined.  */
 453 #define NODE_DISABLED   (1 << 5)        /* A disabled macro.  */
 454 #define NODE_MACRO_ARG  (1 << 6)        /* Used during #define processing. */
 455
 456 /* Different flavors of hash node.  */
 457 enum node_type
 458 {
 459   NT_VOID = 0,     /* No definition yet.  */
 460   NT_MACRO,        /* A macro of some form.  */
 461   NT_ASSERTION     /* Predicate for #assert.  */
 462 };
 463
 464 /* Different flavors of builtin macro.  _Pragma is an operator, but we
 465    handle it with the builtin code for efficiency reasons.  */
 466 enum builtin_type
 467 {
 468   BT_SPECLINE = 0,              /* `__LINE__' */
 469   BT_DATE,                      /* `__DATE__' */
 470   BT_FILE,                      /* `__FILE__' */
 471   BT_BASE_FILE,                 /* `__BASE_FILE__' */
 472   BT_INCLUDE_LEVEL,             /* `__INCLUDE_LEVEL__' */
 473   BT_TIME,                      /* `__TIME__' */
 474   BT_STDC,                      /* `__STDC__' */
 475   BT_PRAGMA                     /* `_Pragma' operator */
 476 };
 477
 478 #define CPP_HASHNODE(HNODE)     ((cpp_hashnode *) (HNODE))
 479 #define HT_NODE(NODE)           ((ht_identifier *) (NODE))
 480 #define NODE_LEN(NODE)          HT_LEN (&(NODE)->ident)
 481 #define NODE_NAME(NODE)         HT_STR (&(NODE)->ident)
 482
 483 /* The common part of an identifier node shared amongst all 3 C front
 484    ends.  Also used to store CPP identifiers, which are a superset of
 485    identifiers in the grammatical sense.  */
 486 struct cpp_hashnode GTY(())
 487 {
 488   struct ht_identifier ident;
 489   unsigned int is_directive : 1;
 490   unsigned int directive_index : 7;     /* If is_directive,
 491                                            then index into directive table.
 492                                            Otherwise, a NODE_OPERATOR. */
 493   unsigned char rid_code;               /* Rid code - for front ends.  */
 494   ENUM_BITFIELD(node_type) type : 8;    /* CPP node type.  */
 495   unsigned char flags;                  /* CPP flags.  */
 496
 497   union _cpp_hashnode_value
 498   {
 499     /* If a macro.  */
 500     cpp_macro * GTY((skip (""))) macro;
 501     /* Answers to an assertion.  */
 502     struct answer * GTY ((skip (""))) answers;
 503     /* Code for a builtin macro.  */
 504     enum builtin_type GTY ((tag ("1"))) builtin;
 505     /* Macro argument index.  */
 506     unsigned short GTY ((tag ("0"))) arg_index;
 507   } GTY ((desc ("0"))) value;
 508 };
 509
 510 /* Call this first to get a handle to pass to other functions.  */
 511 extern cpp_reader *cpp_create_reader PARAMS ((enum c_lang));
 512
 513 /* Call this to change the selected language standard (e.g. because of
 514    command line options).  */
 515 extern void cpp_set_lang PARAMS ((cpp_reader *, enum c_lang));
 516
 517 /* Add a dependency TARGET.  Quote it for "make" if QUOTE.  Can be
 518    called any number of times before cpp_read_main_file().  If no
 519    targets have been added before cpp_read_main_file(), then the
 520    default target is used.  */
 521 extern void cpp_add_dependency_target PARAMS ((cpp_reader *,
 522                                                const char * target,
 523                                                int quote));
 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 PARAMS ((cpp_reader *));
 531 extern const struct line_maps *cpp_get_line_maps PARAMS ((cpp_reader *));
 532 extern cpp_callbacks *cpp_get_callbacks PARAMS ((cpp_reader *));
 533 extern void cpp_set_callbacks PARAMS ((cpp_reader *, cpp_callbacks *));
 534
 535 /* Now call cpp_handle_option[s] to handle 1[or more] switches.  The
 536    return value is the number of arguments used.  If
 537    cpp_handle_options returns without using all arguments, it couldn't
 538    understand the next switch.  Options processing is not completed
 539    until you call cpp_finish_options.  */
 540 extern int cpp_handle_options PARAMS ((cpp_reader *, int, char **));
 541 extern int cpp_handle_option PARAMS ((cpp_reader *, int, char **));
 542
 543 /* This function reads the file, but does not start preprocessing.  It
 544    returns the name of the original file; this is the same as the
 545    input file, except for preprocessed input.  This will generate at
 546    least one file change callback, and possibly a line change callback
 547    too.  If there was an error opening the file, it returns NULL.
 548
 549    If you want cpplib to manage its own hashtable, pass in a NULL
 550    pointer.  Otherwise you should pass in an initialized hash table
 551    that cpplib will share; this technique is used by the C front
 552    ends.  */
 553 extern const char *cpp_read_main_file PARAMS ((cpp_reader *, const char *,
 554                                                struct ht *));
 555
 556 /* Deferred handling of command line options that can generate debug
 557    callbacks, such as -D and -imacros.  Call this after
 558    cpp_read_main_file.  The front ends need this separation so they
 559    can initialize debug output with the original file name, returned
 560    from cpp_read_main_file, before they get debug callbacks.  */
 561 extern void cpp_finish_options PARAMS ((cpp_reader *));
 562
 563 /* Call this to finish preprocessing.  If you requested dependency
 564    generation, pass an open stream to write the information to,
 565    otherwise NULL.  It is your responsibility to close the stream.
 566
 567    Returns cpp_errors (pfile).  */
 568 extern int cpp_finish PARAMS ((cpp_reader *, FILE *deps_stream));
 569
 570 /* Call this to release the handle at the end of preprocessing.  Any
 571    use of the handle after this function returns is invalid.  Returns
 572    cpp_errors (pfile).  */
 573 extern void cpp_destroy PARAMS ((cpp_reader *));
 574
 575 /* Error count.  */
 576 extern unsigned int cpp_errors PARAMS ((cpp_reader *));
 577
 578 extern unsigned int cpp_token_len PARAMS ((const cpp_token *));
 579 extern unsigned char *cpp_token_as_text PARAMS ((cpp_reader *,
 580                                                  const cpp_token *));
 581 extern unsigned char *cpp_spell_token PARAMS ((cpp_reader *, const cpp_token *,
 582                                                unsigned char *));
 583 extern void cpp_register_pragma PARAMS ((cpp_reader *,
 584                                          const char *, const char *,
 585                                          void (*) PARAMS ((cpp_reader *))));
 586
 587 extern int cpp_avoid_paste PARAMS ((cpp_reader *, const cpp_token *,
 588                                     const cpp_token *));
 589 extern const cpp_token *cpp_get_token PARAMS ((cpp_reader *));
 590 extern const unsigned char *cpp_macro_definition PARAMS ((cpp_reader *,
 591                                                   const cpp_hashnode *));
 592 extern void _cpp_backup_tokens PARAMS ((cpp_reader *, unsigned int));
 593
 594 /* Evaluate a CPP_CHAR or CPP_WCHAR token.  */
 595 extern cppchar_t
 596 cpp_interpret_charconst PARAMS ((cpp_reader *, const cpp_token *,
 597                                  unsigned int *, int *));
 598
 599 /* Used to register builtins during the register_builtins callback.
 600    The text is the same as the command line argument.  */
 601 extern void cpp_define PARAMS ((cpp_reader *, const char *));
 602 extern void cpp_assert PARAMS ((cpp_reader *, const char *));
 603 extern void cpp_undef  PARAMS ((cpp_reader *, const char *));
 604 extern void cpp_unassert PARAMS ((cpp_reader *, const char *));
 605
 606 extern cpp_buffer *cpp_push_buffer PARAMS ((cpp_reader *,
 607                                             const unsigned char *, size_t,
 608                                             int, int));
 609 extern int cpp_defined PARAMS ((cpp_reader *, const unsigned char *, int));
 610
 611 /* A preprocessing number.  Code assumes that any unused high bits of
 612    the double integer are set to zero.  */
 613 typedef unsigned HOST_WIDE_INT cpp_num_part;
 614 typedef struct cpp_num cpp_num;
 615 struct cpp_num
 616 {
 617   cpp_num_part high;
 618   cpp_num_part low;
 619   bool unsignedp;  /* True if value should be treated as unsigned.  */
 620   bool overflow;   /* True if the most recent calculation overflowed.  */
 621 };
 622
 623 /* cpplib provides two interfaces for interpretation of preprocessing
 624    numbers.
 625
 626    cpp_classify_number categorizes numeric constants according to
 627    their field (integer, floating point, or invalid), radix (decimal,
 628    octal, hexadecimal), and type suffixes.  */
 629
 630 #define CPP_N_CATEGORY  0x000F
 631 #define CPP_N_INVALID   0x0000
 632 #define CPP_N_INTEGER   0x0001
 633 #define CPP_N_FLOATING  0x0002
 634
 635 #define CPP_N_WIDTH     0x00F0
 636 #define CPP_N_SMALL     0x0010  /* int, float.  */
 637 #define CPP_N_MEDIUM    0x0020  /* long, double.  */
 638 #define CPP_N_LARGE     0x0040  /* long long, long double.  */
 639
 640 #define CPP_N_RADIX     0x0F00
 641 #define CPP_N_DECIMAL   0x0100
 642 #define CPP_N_HEX       0x0200
 643 #define CPP_N_OCTAL     0x0400
 644
 645 #define CPP_N_UNSIGNED  0x1000  /* Properties.  */
 646 #define CPP_N_IMAGINARY 0x2000
 647
 648 /* Classify a CPP_NUMBER token.  The return value is a combination of
 649    the flags from the above sets.  */
 650 extern unsigned cpp_classify_number PARAMS ((cpp_reader *, const cpp_token *));
 651
 652 /* Evaluate a token classified as category CPP_N_INTEGER.  */
 653 extern cpp_num cpp_interpret_integer PARAMS ((cpp_reader *, const cpp_token *,
 654                                               unsigned int type));
 655
 656 /* Sign extend a number, with PRECISION significant bits and all
 657    others assumed clear, to fill out a cpp_num structure.  */
 658 cpp_num cpp_num_sign_extend PARAMS ((cpp_num, size_t));
 659
 660 /* Diagnostic levels.  To get a diagnostic without associating a
 661    position in the translation unit with it, use cpp_error_with_line
 662    with a line number of zero.  */
 663
 664 /* Warning, an error with -Werror.  */
 665 #define DL_WARNING              0x00
 666 /* Same as DL_WARNING, except it is not suppressed in system headers.  */
 667 #define DL_WARNING_SYSHDR       0x01
 668 /* Warning, an error with -pedantic-errors or -Werror.  */
 669 #define DL_PEDWARN              0x02
 670 /* An error.  */
 671 #define DL_ERROR                0x03
 672 /* An internal consistency check failed.  Prints "internal error: ",
 673    otherwise the same as DL_ERROR.  */
 674 #define DL_ICE                  0x04
 675 /* Extracts a diagnostic level from an int.  */
 676 #define DL_EXTRACT(l)           (l & 0xf)
 677 /* Nonzero if a diagnostic level is one of the warnings.  */
 678 #define DL_WARNING_P(l)         (DL_EXTRACT (l) >= DL_WARNING \
 679                                  && DL_EXTRACT (l) <= DL_PEDWARN)
 680
 681 /* N.B. The error-message-printer prototypes have not been nicely
 682    formatted because exgettext needs to see 'msgid' on the same line
 683    as the name of the function in order to work properly.  Only the
 684    string argument gets a name in an effort to keep the lines from
 685    getting ridiculously oversized.  */
 686
 687 /* Output a diagnostic of some kind.  */
 688 extern void cpp_error PARAMS ((cpp_reader *, int, const char *msgid, ...))
 689   ATTRIBUTE_PRINTF_3;
 690
 691 /* Output a diagnostic of severity LEVEL, with "MSG: " preceding the
 692    error string of errno.  No location is printed.  */
 693 extern void cpp_errno PARAMS ((cpp_reader *, int level, const char *msg));
 694
 695 /* Same as cpp_error, except additionally specifies a position as a
 696    (translation unit) physical line and physical column.  If the line is
 697    zero, then no location is printed.  */
 698 extern void cpp_error_with_line PARAMS ((cpp_reader *, int, unsigned, unsigned, const char *msgid, ...))
 699   ATTRIBUTE_PRINTF_5;
 700
 701 /* In cpplex.c */
 702 extern int cpp_ideq                     PARAMS ((const cpp_token *,
 703                                                  const char *));
 704 extern void cpp_output_line             PARAMS ((cpp_reader *, FILE *));
 705 extern void cpp_output_token            PARAMS ((const cpp_token *, FILE *));
 706 extern const char *cpp_type2name        PARAMS ((enum cpp_ttype));
 707 /* Returns the value of an escape sequence, truncated to the correct
 708    target precision.  PSTR points to the input pointer, which is just
 709    after the backslash.  LIMIT is how much text we have.  WIDE is true
 710    if the escape sequence is part of a wide character constant or
 711    string literal.  Handles all relevant diagnostics.  */
 712 extern cppchar_t cpp_parse_escape       PARAMS ((cpp_reader *,
 713                                                  const unsigned char ** pstr,
 714                                                  const unsigned char *limit,
 715                                                  int wide));
 716
 717 /* In cpphash.c */
 718
 719 /* Lookup an identifier in the hashtable.  Puts the identifier in the
 720    table if it is not already there.  */
 721 extern cpp_hashnode *cpp_lookup         PARAMS ((cpp_reader *,
 722                                                  const unsigned char *,
 723                                                  unsigned int));
 724
 725 typedef int (*cpp_cb) PARAMS ((cpp_reader *, cpp_hashnode *, void *));
 726 extern void cpp_forall_identifiers      PARAMS ((cpp_reader *,
 727                                                  cpp_cb, void *));
 728
 729 /* In cppmacro.c */
 730 extern void cpp_scan_nooutput           PARAMS ((cpp_reader *));
 731 extern int  cpp_sys_macro_p             PARAMS ((cpp_reader *));
 732 extern unsigned char *cpp_quote_string  PARAMS ((unsigned char *,
 733                                                  const unsigned char *,
 734                                                  unsigned int));
 735
 736 /* In cppfiles.c */
 737 extern int cpp_included PARAMS ((cpp_reader *, const char *));
 738 extern void cpp_make_system_header PARAMS ((cpp_reader *, int, int));
 739
 740 /* In cpppch.c */
 741 struct save_macro_data;
 742 extern int cpp_save_state PARAMS ((cpp_reader *, FILE *));
 743 extern int cpp_write_pch_deps PARAMS ((cpp_reader *, FILE *));
 744 extern int cpp_write_pch_state PARAMS ((cpp_reader *, FILE *));
 745 extern int cpp_valid_state PARAMS ((cpp_reader *, const char *, int));
 746 extern void cpp_prepare_state PARAMS ((cpp_reader *,
 747                                        struct save_macro_data **));
 748 extern int cpp_read_state PARAMS ((cpp_reader *, const char *, FILE *,
 749                                    struct save_macro_data *));
 750
 751 /* In cppmain.c */
 752 extern void cpp_preprocess_file PARAMS ((cpp_reader *, const char *, FILE *));
 753
 754 #ifdef __cplusplus
 755 }
 756 #endif
 757
 758 #endif /* ! GCC_CPPLIB_H */