src/lj_lex.h

   1 /*
   2 ** Lexical analyzer.
   3 ** Major parts taken verbatim from the Lua interpreter.
   4 ** Copyright (C) 1994-2008 Lua.org, PUC-Rio. See Copyright Notice in lua.h
   5 */
   6
   7 #ifndef _LJ_LEX_H
   8 #define _LJ_LEX_H
   9
  10 #include <stdarg.h>
  11
  12 #include "lj_obj.h"
  13 #include "lj_err.h"
  14
  15 /* Lua lexer tokens. */
  16 #define TKDEF(_, __) \
  17   _(and) _(break) _(do) _(else) _(elseif) _(end) _(false) \
  18   _(for) _(function) _(goto) _(if) _(in) _(local) _(nil) _(not) _(or) \
  19   _(repeat) _(return) _(then) _(true) _(until) _(while) \
  20   __(concat, ..) __(dots, ...) __(eq, ==) __(ge, >=) __(le, <=) __(ne, ~=) \
  21   __(label, ::) __(number, <number>) __(name, <name>) __(string, <string>) \
  22   __(eof, <eof>)
  23
  24 enum {
  25   TK_OFS = 256,
  26 #define TKENUM1(name)           TK_##name,
  27 #define TKENUM2(name, sym)      TK_##name,
  28 TKDEF(TKENUM1, TKENUM2)
  29 #undef TKENUM1
  30 #undef TKENUM2
  31   TK_RESERVED = TK_while - TK_OFS
  32 };
  33
  34 typedef int LexToken;
  35
  36 /* Combined bytecode ins/line. Only used during bytecode generation. */
  37 typedef struct BCInsLine {
  38   BCIns ins;            /* Bytecode instruction. */
  39   BCLine line;          /* Line number for this bytecode. */
  40 } BCInsLine;
  41
  42 /* Info for local variables. Only used during bytecode generation. */
  43 typedef struct VarInfo {
  44   GCRef name;           /* Local variable name or goto/label name. */
  45   BCPos startpc;        /* First point where the local variable is active. */
  46   BCPos endpc;          /* First point where the local variable is dead. */
  47   uint8_t slot;         /* Variable slot. */
  48   uint8_t info;         /* Variable/goto/label info. */
  49 } VarInfo;
  50
  51 /* Lua lexer state. */
  52 typedef struct LexState {
  53   struct FuncState *fs; /* Current FuncState. Defined in lj_parse.c. */
  54   struct lua_State *L;  /* Lua state. */
  55   TValue tokenval;      /* Current token value. */
  56   TValue lookaheadval;  /* Lookahead token value. */
  57   int current;          /* Current character (charint). */
  58   LexToken token;       /* Current token. */
  59   LexToken lookahead;   /* Lookahead token. */
  60   MSize n;              /* Bytes left in input buffer. */
  61   const char *p;        /* Current position in input buffer. */
  62   SBuf sb;              /* String buffer for tokens. */
  63   lua_Reader rfunc;     /* Reader callback. */
  64   void *rdata;          /* Reader callback data. */
  65   BCLine linenumber;    /* Input line counter. */
  66   BCLine lastline;      /* Line of last token. */
  67   GCstr *chunkname;     /* Current chunk name (interned string). */
  68   const char *chunkarg; /* Chunk name argument. */
  69   const char *mode;     /* Allow loading bytecode (b) and/or source text (t). */
  70   VarInfo *vstack;      /* Stack for names and extents of local variables. */
  71   MSize sizevstack;     /* Size of variable stack. */
  72   MSize vtop;           /* Top of variable stack. */
  73   BCInsLine *bcstack;   /* Stack for bytecode instructions/line numbers. */
  74   MSize sizebcstack;    /* Size of bytecode stack. */
  75   uint32_t level;       /* Syntactical nesting level. */
  76 } LexState;
  77
  78 LJ_FUNC int lj_lex_setup(lua_State *L, LexState *ls);
  79 LJ_FUNC void lj_lex_cleanup(lua_State *L, LexState *ls);
  80 LJ_FUNC void lj_lex_next(LexState *ls);
  81 LJ_FUNC LexToken lj_lex_lookahead(LexState *ls);
  82 LJ_FUNC const char *lj_lex_token2str(LexState *ls, LexToken token);
  83 LJ_FUNC_NORET void lj_lex_error(LexState *ls, LexToken token, ErrMsg em, ...);
  84 LJ_FUNC void lj_lex_init(lua_State *L);
  85
  86 #endif