gcc/cpphash.h

   1 /* Part of CPP library.
   2    Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
   3
   4 This program is free software; you can redistribute it and/or modify it
   5 under the terms of the GNU General Public License as published by the
   6 Free Software Foundation; either version 2, or (at your option) any
   7 later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 /* This header defines all the internal data structures and functions
  19    that need to be visible across files.  It's called cpphash.h for
  20    historical reasons.  */
  21
  22 #ifndef __GCC_CPPHASH__
  23 #define __GCC_CPPHASH__
  24
  25 typedef unsigned char U_CHAR;
  26 #define U (const U_CHAR *)  /* Intended use: U"string" */
  27
  28 /* gcc 2.7.2 can't handle __extension__ const char array[] = { ... }.
  29    I don't know when this was added - be conservative, assume it only
  30    works in 2.95.  */
  31 #if GCC_VERSION < 2095
  32 #define __extension__
  33 #endif
  34
  35 /* The structure of a node in the hash table.  The hash table
  36    has entries for all tokens defined by #define commands (type T_MACRO),
  37    plus some special tokens like __LINE__ (these each have their own
  38    type, and the appropriate code is run when that type of node is seen.
  39    It does not contain control words like "#define", which are recognized
  40    by a separate piece of code. */
  41
  42 /* different flavors of hash nodes */
  43 enum node_type
  44 {
  45   T_VOID = 0,      /* no definition yet */
  46   T_SPECLINE,      /* `__LINE__' */
  47   T_DATE,          /* `__DATE__' */
  48   T_FILE,          /* `__FILE__' */
  49   T_BASE_FILE,     /* `__BASE_FILE__' */
  50   T_INCLUDE_LEVEL, /* `__INCLUDE_LEVEL__' */
  51   T_TIME,          /* `__TIME__' */
  52   T_STDC,          /* `__STDC__' */
  53   T_CONST,         /* Constant string, used by `__SIZE_TYPE__' etc */
  54   T_XCONST,        /* Ditto, but the string is malloced memory */
  55   T_POISON,        /* poisoned identifier */
  56   T_MACRO,         /* object-like macro */
  57   T_FMACRO,        /* function-like macro */
  58   T_IDENTITY,      /* macro defined to itself */
  59   T_EMPTY          /* macro defined to nothing */
  60 };
  61
  62 typedef struct hashnode HASHNODE;
  63 struct hashnode
  64 {
  65   unsigned int hash;                    /* cached hash value */
  66   unsigned short length;                /* length of name */
  67   ENUM_BITFIELD(node_type) type : 8;    /* node type */
  68   char disabled;                        /* macro turned off for rescan? */
  69
  70   union {
  71     const U_CHAR *cpval;                /* some predefined macros */
  72     const struct object_defn *odefn;    /* #define foo bar */
  73     const struct funct_defn *fdefn;     /* #define foo(x) bar(x) */
  74     struct hashnode *aschain;           /* #assert */
  75   } value;
  76
  77   const U_CHAR *name;
  78 };
  79
  80 /* List of directories to look for include files in. */
  81 struct file_name_list
  82 {
  83   struct file_name_list *next;
  84   struct file_name_list *alloc; /* for the cache of
  85                                    current directory entries */
  86   char *name;
  87   unsigned int nlen;
  88   /* We use these to tell if the directory mentioned here is a duplicate
  89      of an earlier directory on the search path. */
  90   ino_t ino;
  91   dev_t dev;
  92   /* If the following is nonzero, it is a C-language system include
  93      directory.  */
  94   int sysp;
  95   /* Mapping of file names for this directory.
  96      Only used on MS-DOS and related platforms. */
  97   struct file_name_map *name_map;
  98 };
  99 #define ABSOLUTE_PATH ((struct file_name_list *)-1)
 100
 101 /* This structure is used for the table of all includes.  It is
 102    indexed by the `short name' (the name as it appeared in the
 103    #include statement) which is stored in *nshort.  */
 104 struct ihash
 105 {
 106   /* Next file with the same short name but a
 107      different (partial) pathname). */
 108   struct ihash *next_this_file;
 109
 110   /* Location of the file in the include search path.
 111      Used for include_next */
 112   struct file_name_list *foundhere;
 113
 114   unsigned int hash;            /* save hash value for future reference */
 115   const char *nshort;           /* name of file as referenced in #include;
 116                                    points into name[]  */
 117   const U_CHAR *control_macro;  /* macro, if any, preventing reinclusion -
 118                                    see redundant_include_p */
 119   const char name[1];           /* (partial) pathname of file */
 120 };
 121 typedef struct ihash IHASH;
 122
 123 /* Character classes.
 124    If the definition of `numchar' looks odd to you, please look up the
 125    definition of a pp-number in the C standard [section 6.4.8 of C99] */
 126 #define ISidnum         0x01    /* a-zA-Z0-9_ */
 127 #define ISidstart       0x02    /* _a-zA-Z */
 128 #define ISnumstart      0x04    /* 0-9 */
 129 #define IShspace        0x08    /* ' ' \t \f \v */
 130 #define ISspace         0x10    /* ' ' \t \f \v \n */
 131
 132 #define _dollar_ok(x)   ((x) == '$' && CPP_OPTION (pfile, dollars_in_ident))
 133
 134 #define is_idchar(x)    ((_cpp_IStable[x] & ISidnum) || _dollar_ok(x))
 135 #define is_idstart(x)   ((_cpp_IStable[x] & ISidstart) || _dollar_ok(x))
 136 #define is_numchar(x)   (_cpp_IStable[x] & ISidnum)
 137 #define is_numstart(x)  (_cpp_IStable[x] & ISnumstart)
 138 #define is_hspace(x)    (_cpp_IStable[x] & IShspace)
 139 #define is_space(x)     (_cpp_IStable[x] & ISspace)
 140
 141 /* This table is constant if it can be initialized at compile time,
 142    which is the case if cpp was compiled with GCC >=2.7, or another
 143    compiler that supports C99.  */
 144 #if (GCC_VERSION >= 2007) || (__STDC_VERSION__ >= 199901L)
 145 extern const unsigned char _cpp_IStable[256];
 146 #else
 147 extern unsigned char _cpp_IStable[256];
 148 #endif
 149
 150 /* Macros.  */
 151
 152 /* One character lookahead in the input buffer.  Note that if this
 153    returns EOF, it does *not* necessarily mean the file's end has been
 154    reached.  */
 155 #define CPP_BUF_PEEK(BUFFER) \
 156   ((BUFFER)->cur < (BUFFER)->rlimit ? *(BUFFER)->cur : EOF)
 157
 158 /* Make sure PFILE->token_buffer has space for at least N more characters. */
 159 #define CPP_RESERVE(PFILE, N) \
 160   (CPP_WRITTEN (PFILE) + (size_t)(N) > (PFILE)->token_buffer_size \
 161    && (_cpp_grow_token_buffer (PFILE, N), 0))
 162
 163 /* Append string STR (of length N) to PFILE's output buffer.
 164    Assume there is enough space. */
 165 #define CPP_PUTS_Q(PFILE, STR, N) \
 166   (memcpy ((PFILE)->limit, STR, (N)), (PFILE)->limit += (N))
 167 /* Append string STR (of length N) to PFILE's output buffer.  Make space. */
 168 #define CPP_PUTS(PFILE, STR, N) CPP_RESERVE(PFILE, N), CPP_PUTS_Q(PFILE, STR,N)
 169 /* Append character CH to PFILE's output buffer.  Assume sufficient space. */
 170 #define CPP_PUTC_Q(PFILE, CH) (*(PFILE)->limit++ = (CH))
 171 /* Append character CH to PFILE's output buffer.  Make space if need be. */
 172 #define CPP_PUTC(PFILE, CH) (CPP_RESERVE (PFILE, 1), CPP_PUTC_Q (PFILE, CH))
 173
 174 /* Advance the current line by one. */
 175 #define CPP_BUMP_BUFFER_LINE(PBUF) ((PBUF)->lineno++,\
 176                                     (PBUF)->line_base = (PBUF)->cur)
 177 #define CPP_BUMP_LINE(PFILE) CPP_BUMP_BUFFER_LINE(CPP_BUFFER(PFILE))
 178 #define CPP_BUMP_BUFFER_LINE_CUR(PBUF, CUR) ((PBUF)->lineno++,\
 179                                              (PBUF)->line_base = CUR)
 180 #define CPP_BUMP_LINE_CUR(PFILE, CUR) \
 181                             CPP_BUMP_BUFFER_LINE_CUR(CPP_BUFFER(PFILE), CUR)
 182 #define CPP_PREV_BUFFER(BUFFER) ((BUFFER)->prev)
 183
 184 /* Are we in column 1 right now?  Used mainly for -traditional handling
 185    of directives.  */
 186 #define CPP_IN_COLUMN_1(PFILE) \
 187 (CPP_BUFFER (PFILE)->cur - CPP_BUFFER (PFILE)->line_base == 1)
 188
 189 #define CPP_PRINT_DEPS(PFILE) CPP_OPTION (PFILE, print_deps)
 190 #define CPP_TRADITIONAL(PFILE) CPP_OPTION (PFILE, traditional)
 191 #define CPP_PEDANTIC(PFILE) \
 192   (CPP_OPTION (PFILE, pedantic) && !CPP_BUFFER (PFILE)->system_header_p)
 193 #define CPP_WTRADITIONAL(PF) \
 194   (CPP_OPTION (PF, warn_traditional) && !CPP_BUFFER (PF)->system_header_p)
 195
 196 /* CPP_IS_MACRO_BUFFER is true if the buffer contains macro expansion.
 197    (Note that it is false while we're expanding macro *arguments*.) */
 198 #define CPP_IS_MACRO_BUFFER(PBUF) ((PBUF)->macro != NULL)
 199
 200 /* Remember the current position of PFILE so it may be returned to
 201    after looking ahead a bit.
 202
 203    Note that when you set a mark, you _must_ return to that mark.  You
 204    may not forget about it and continue parsing.  You may not pop a
 205    buffer with an active mark.  You may not call CPP_BUMP_LINE while a
 206    mark is active.  */
 207 #define CPP_SET_BUF_MARK(IP)   ((IP)->mark = (IP)->cur)
 208 #define CPP_GOTO_BUF_MARK(IP)  ((IP)->cur = (IP)->mark, (IP)->mark = 0)
 209 #define CPP_SET_MARK(PFILE)  CPP_SET_BUF_MARK(CPP_BUFFER(PFILE))
 210 #define CPP_GOTO_MARK(PFILE) CPP_GOTO_BUF_MARK(CPP_BUFFER(PFILE))
 211
 212 /* ACTIVE_MARK_P is true if there's a live mark in the buffer.  */
 213 #define ACTIVE_MARK_P(PFILE) (CPP_BUFFER (PFILE)->mark != 0)
 214
 215 /* Are mark and point adjacent characters?  Used mostly to deal with
 216    the somewhat annoying semantic of #define.  */
 217 #define ADJACENT_TO_MARK(PFILE) \
 218  (CPP_BUFFER(PFILE)->cur - CPP_BUFFER(PFILE)->mark == 1)
 219
 220 /* In cpphash.c */
 221 extern unsigned int _cpp_calc_hash      PARAMS ((const U_CHAR *, size_t));
 222 extern HASHNODE *_cpp_lookup            PARAMS ((cpp_reader *,
 223                                                  const U_CHAR *, int));
 224 extern void _cpp_free_definition        PARAMS ((HASHNODE *));
 225 extern int _cpp_create_definition       PARAMS ((cpp_reader *,
 226                                                  cpp_toklist *, HASHNODE *));
 227 extern void _cpp_dump_definition        PARAMS ((cpp_reader *, HASHNODE *));
 228 extern void _cpp_quote_string           PARAMS ((cpp_reader *, const U_CHAR *));
 229 extern void _cpp_macroexpand            PARAMS ((cpp_reader *, HASHNODE *));
 230 extern void _cpp_init_macro_hash        PARAMS ((cpp_reader *));
 231 extern void _cpp_dump_macro_hash        PARAMS ((cpp_reader *));
 232
 233 /* In cppfiles.c */
 234 extern void _cpp_simplify_pathname      PARAMS ((char *));
 235 extern void _cpp_execute_include        PARAMS ((cpp_reader *, U_CHAR *,
 236                                                  unsigned int, int,
 237                                                  struct file_name_list *));
 238 extern void _cpp_init_include_hash      PARAMS ((cpp_reader *));
 239 extern const char *_cpp_fake_ihash      PARAMS ((cpp_reader *, const char *));
 240
 241 /* In cppexp.c */
 242 extern int _cpp_parse_expr              PARAMS ((cpp_reader *));
 243
 244 /* In cpplex.c */
 245 extern void _cpp_parse_name             PARAMS ((cpp_reader *, int));
 246 extern void _cpp_skip_rest_of_line      PARAMS ((cpp_reader *));
 247 extern void _cpp_skip_hspace            PARAMS ((cpp_reader *));
 248 extern void _cpp_expand_to_buffer       PARAMS ((cpp_reader *,
 249                                                  const unsigned char *, int));
 250 extern int _cpp_parse_assertion         PARAMS ((cpp_reader *));
 251 extern enum cpp_ttype _cpp_lex_token    PARAMS ((cpp_reader *));
 252 extern long _cpp_read_and_prescan       PARAMS ((cpp_reader *, cpp_buffer *,
 253                                                  int, size_t));
 254 extern void _cpp_init_input_buffer      PARAMS ((cpp_reader *));
 255 extern void _cpp_grow_token_buffer      PARAMS ((cpp_reader *, long));
 256 extern enum cpp_ttype _cpp_get_directive_token
 257                                         PARAMS ((cpp_reader *));
 258 extern enum cpp_ttype _cpp_get_define_token
 259                                         PARAMS ((cpp_reader *));
 260 extern void _cpp_scan_line              PARAMS ((cpp_reader *, cpp_toklist *));
 261
 262 /* In cpplib.c */
 263 extern int _cpp_handle_directive        PARAMS ((cpp_reader *));
 264 extern void _cpp_unwind_if_stack        PARAMS ((cpp_reader *, cpp_buffer *));
 265 extern void _cpp_check_directive        PARAMS ((cpp_toklist *, cpp_token *));
 266
 267 /* These are inline functions instead of macros so we can get type
 268    checking.  */
 269
 270 static inline int ustrcmp       PARAMS ((const U_CHAR *, const U_CHAR *));
 271 static inline int ustrncmp      PARAMS ((const U_CHAR *, const U_CHAR *,
 272                                          size_t));
 273 static inline size_t ustrlen    PARAMS ((const U_CHAR *));
 274 static inline U_CHAR *uxstrdup  PARAMS ((const U_CHAR *));
 275 static inline U_CHAR *ustrchr   PARAMS ((const U_CHAR *, int));
 276
 277 static inline int
 278 ustrcmp (s1, s2)
 279      const U_CHAR *s1, *s2;
 280 {
 281   return strcmp ((const char *)s1, (const char *)s2);
 282 }
 283
 284 static inline int
 285 ustrncmp (s1, s2, n)
 286      const U_CHAR *s1, *s2;
 287      size_t n;
 288 {
 289   return strncmp ((const char *)s1, (const char *)s2, n);
 290 }
 291
 292 static inline size_t
 293 ustrlen (s1)
 294      const U_CHAR *s1;
 295 {
 296   return strlen ((const char *)s1);
 297 }
 298
 299 static inline U_CHAR *
 300 uxstrdup (s1)
 301      const U_CHAR *s1;
 302 {
 303   return (U_CHAR *) xstrdup ((const char *)s1);
 304 }
 305
 306 static inline U_CHAR *
 307 ustrchr (s1, c)
 308      const U_CHAR *s1;
 309      int c;
 310 {
 311   return (U_CHAR *) strchr ((const char *)s1, c);
 312 }
 313
 314 #endif