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) _(if) _(in) _(local) _(nil) _(not) _(or) \
  19   _(repeat) _(return) _(then) _(true) _(until) _(while) \
  20   __(concat, ..) __(dots, ...) __(eq, ==) __(ge, >=) __(le, <=) __(ne, ~=) \
  21   __(number, <number>) __(name, <name>) __(string, <string>) __(eof, <eof>)
  22
  23 enum {
  24   TK_OFS = 256,
  25 #define TKENUM1(name)           TK_##name,
  26 #define TKENUM2(name, sym)      TK_##name,
  27 TKDEF(TKENUM1, TKENUM2)
  28 #undef TKENUM1
  29 #undef TKENUM2
  30   TK_RESERVED = TK_while - TK_OFS
  31 };
  32
  33 typedef int LexToken;
  34
  35 /* Combined bytecode ins/line. Only used during bytecode generation. */
  36 typedef struct BCInsLine {
  37   BCIns ins;            /* Bytecode instruction. */
  38   BCLine line;          /* Line number for this bytecode. */
  39 } BCInsLine;
  40
  41 /* Info for local variables. Only used during bytecode generation. */
  42 typedef struct VarInfo {
  43   GCRef name;           /* Local variable name. */
  44   BCPos startpc;        /* First point where the local variable is active. */
  45   BCPos endpc;          /* First point where the local variable is dead. */
  46 } VarInfo;
  47
  48 /* Lua lexer state. */
  49 typedef struct LexState {
  50   struct FuncState *fs; /* Current FuncState. Defined in lj_parse.c. */
  51   struct lua_State *L;  /* Lua state. */
  52   TValue tokenval;      /* Current token value. */
  53   TValue lookaheadval;  /* Lookahead token value. */
  54   int current;          /* Current character (charint). */
  55   LexToken token;       /* Current token. */
  56   LexToken lookahead;   /* Lookahead token. */
  57   MSize n;              /* Bytes left in input buffer. */
  58   const char *p;        /* Current position in input buffer. */
  59   SBuf sb;              /* String buffer for tokens. */
  60   lua_Reader rfunc;     /* Reader callback. */
  61   void *rdata;          /* Reader callback data. */
  62   BCLine linenumber;    /* Input line counter. */
  63   BCLine lastline;      /* Line of last token. */
  64   GCstr *chunkname;     /* Current chunk name (interned string). */
  65   const char *chunkarg; /* Chunk name argument. */
  66   VarInfo *vstack;      /* Stack for names and extents of local variables. */
  67   MSize sizevstack;     /* Size of variable stack. */
  68   MSize vtop;           /* Top of variable stack. */
  69   BCInsLine *bcstack;   /* Stack for bytecode instructions/line numbers. */
  70   MSize sizebcstack;    /* Size of bytecode stack. */
  71   uint32_t level;       /* Syntactical nesting level. */
  72 } LexState;
  73
  74 LJ_FUNC int lj_lex_setup(lua_State *L, LexState *ls);
  75 LJ_FUNC void lj_lex_cleanup(lua_State *L, LexState *ls);
  76 LJ_FUNC void lj_lex_next(LexState *ls);
  77 LJ_FUNC LexToken lj_lex_lookahead(LexState *ls);
  78 LJ_FUNC const char *lj_lex_token2str(LexState *ls, LexToken token);
  79 LJ_FUNC_NORET void lj_lex_error(LexState *ls, LexToken token, ErrMsg em, ...);
  80 LJ_FUNC void lj_lex_init(lua_State *L);
  81
  82 #endif