token.h

   1 #ifndef TOKEN_H
   2 #define TOKEN_H
   3 /*
   4  * Basic tokenization structures. NOTE! Those tokens had better
   5  * be pretty small, since we're going to keep them all in memory
   6  * indefinitely.
   7  *
   8  * Copyright (C) 2003 Transmeta Corp.
   9  *               2003 Linus Torvalds
  10  *
  11  *  Licensed under the Open Software License version 1.1
  12  */
  13
  14 #include <sys/types.h>
  15 #include "lib.h"
  16
  17 /*
  18  * This describes the pure lexical elements (tokens), with
  19  * no semantic meaning. In other words, an identifier doesn't
  20  * have a type or meaning, it is only a specific string in
  21  * the input stream.
  22  *
  23  * Semantic meaning is handled elsewhere.
  24  */
  25
  26 struct stream {
  27         int fd;
  28         const char *name;
  29
  30         /* Use these to check for "already parsed" */
  31         int constant, nesting;
  32         struct ident *protect;
  33         dev_t dev;
  34         ino_t ino;
  35 };
  36
  37 extern int input_stream_nr;
  38 extern struct stream *input_streams;
  39
  40 extern int ident_hit, ident_miss;
  41
  42 struct ident {
  43         struct ident *next;     /* Hash chain of identifiers */
  44         struct symbol *symbols; /* Pointer to semantic meaning list */
  45         unsigned char len;      /* Length of identifier name */
  46         unsigned char tainted;
  47         char name[];            /* Actual identifier */
  48 };
  49
  50 enum token_type {
  51         TOKEN_EOF,
  52         TOKEN_ERROR,
  53         TOKEN_IDENT,
  54         TOKEN_NUMBER,
  55         TOKEN_CHAR,
  56         TOKEN_STRING,
  57         TOKEN_SPECIAL,
  58         TOKEN_STREAMBEGIN,
  59         TOKEN_STREAMEND,
  60         TOKEN_MACRO_ARGUMENT,
  61         TOKEN_UNTAINT,
  62 };
  63
  64 /* Combination tokens */
  65 #define COMBINATION_STRINGS {   \
  66         "+=", "++",             \
  67         "-=", "--", "->",       \
  68         "*=",                   \
  69         "/=", "/*", "//",       \
  70         "%=",                   \
  71         "..", "...",            \
  72         "<=", "<<", "<<=",      \
  73         ">=", ">>", ">>=",      \
  74         "==", "!=",             \
  75         "&&", "&=",             \
  76         "||", "|=",             \
  77         "^=", "##",             \
  78         " @ ",                  \
  79 }
  80
  81 enum special_token {
  82         SPECIAL_BASE = 256,
  83         SPECIAL_ADD_ASSIGN = 256,
  84         SPECIAL_INCREMENT,
  85         SPECIAL_SUB_ASSIGN,
  86         SPECIAL_DECREMENT,
  87         SPECIAL_DEREFERENCE,
  88         SPECIAL_MUL_ASSIGN,
  89         SPECIAL_DIV_ASSIGN,
  90         SPECIAL_COMMENT,
  91         SPECIAL_CPPCOMMENT,
  92         SPECIAL_MOD_ASSIGN,
  93         SPECIAL_DOTDOT,
  94         SPECIAL_ELLIPSIS,
  95         SPECIAL_LTE,
  96         SPECIAL_LEFTSHIFT,
  97         SPECIAL_SHL_ASSIGN,
  98         SPECIAL_GTE,
  99         SPECIAL_RIGHTSHIFT,
 100         SPECIAL_SHR_ASSIGN,
 101         SPECIAL_EQUAL,
 102         SPECIAL_NOTEQUAL,
 103         SPECIAL_LOGICAL_AND,
 104         SPECIAL_AND_ASSIGN,
 105         SPECIAL_LOGICAL_OR,
 106         SPECIAL_OR_ASSIGN,
 107         SPECIAL_XOR_ASSIGN,
 108         SPECIAL_HASHHASH,
 109         SPECIAL_ARG_SEPARATOR
 110 };
 111
 112 struct string {
 113         unsigned int length;
 114         char data[];
 115 };
 116
 117 /*
 118  * This is a very common data structure, it should be kept
 119  * as small as humanly possible. Big (rare) types go as
 120  * pointers.
 121  */
 122 struct token {
 123         struct position pos;
 124         struct token *next;
 125         union {
 126                 char *number;
 127                 struct ident *ident;
 128                 unsigned int special;
 129                 struct string *string;
 130                 int character;
 131                 int argnum;
 132         };
 133 };
 134
 135 #define token_type(x) ((x)->pos.type)
 136
 137 /*
 138  * Last token in the stream - points to itself.
 139  * This allows us to not test for NULL pointers
 140  * when following the token->next chain..
 141  */
 142 extern int preprocessing, verbose;
 143 extern struct token eof_token_entry;
 144 #define eof_token(x) ((x) == &eof_token_entry)
 145
 146 extern int init_stream(const char *, int fd);
 147 extern struct ident *hash_ident(struct ident *);
 148 extern struct ident *built_in_ident(const char *);
 149 extern struct token *built_in_token(int, const char *);
 150 extern const char *show_special(int);
 151 extern const char *show_ident(const struct ident *);
 152 extern const char *show_string(const struct string *string);
 153 extern const char *show_token(const struct token *);
 154 extern struct token * tokenize(const char *, int, struct token *);
 155 extern struct token * tokenize_buffer(unsigned char *, unsigned long, struct token *);
 156
 157 extern void die(const char *, ...);
 158 extern void show_identifier_stats(void);
 159 extern struct token *preprocess(struct token *);
 160
 161 static inline int match_op(struct token *token, int op)
 162 {
 163         return token->pos.type == TOKEN_SPECIAL && token->special == op;
 164 }
 165
 166 static inline int match_ident(struct token *token, struct ident *id)
 167 {
 168         return token->pos.type == TOKEN_IDENT && token->ident == id;
 169 }
 170
 171 #endif