94 lines
3.3 KiB
C
94 lines
3.3 KiB
C
/*
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** Lexical analyzer.
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** Copyright (C) 2005-2022 Mike Pall. See Copyright Notice in luajit.h
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*/
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#ifndef _LJ_LEX_H
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#define _LJ_LEX_H
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#include <stdarg.h>
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#include "lj_obj.h"
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#include "lj_err.h"
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/* Lua lexer tokens. */
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#define TKDEF(_, __) \
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_(and) _(break) _(do) _(else) _(elseif) _(end) _(false) \
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_(for) _(function) _(goto) _(if) _(in) _(local) _(nil) _(not) _(or) \
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_(repeat) _(return) _(then) _(true) _(until) _(while) \
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__(concat, ..) __(dots, ...) __(eq, ==) __(ge, >=) __(le, <=) __(ne, ~=) \
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__(label, ::) __(number, <number>) __(name, <name>) __(string, <string>) \
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__(eof, <eof>)
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enum {
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TK_OFS = 256,
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#define TKENUM1(name) TK_##name,
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#define TKENUM2(name, sym) TK_##name,
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TKDEF(TKENUM1, TKENUM2)
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#undef TKENUM1
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#undef TKENUM2
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TK_RESERVED = TK_while - TK_OFS
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};
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typedef int LexChar; /* Lexical character. Unsigned ext. from char. */
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typedef int LexToken; /* Lexical token. */
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/* Combined bytecode ins/line. Only used during bytecode generation. */
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typedef struct BCInsLine {
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BCIns ins; /* Bytecode instruction. */
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BCLine line; /* Line number for this bytecode. */
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} BCInsLine;
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/* Info for local variables. Only used during bytecode generation. */
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typedef struct VarInfo {
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GCRef name; /* Local variable name or goto/label name. */
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BCPos startpc; /* First point where the local variable is active. */
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BCPos endpc; /* First point where the local variable is dead. */
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uint8_t slot; /* Variable slot. */
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uint8_t info; /* Variable/goto/label info. */
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} VarInfo;
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/* Lua lexer state. */
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typedef struct LexState {
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struct FuncState *fs; /* Current FuncState. Defined in lj_parse.c. */
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struct lua_State *L; /* Lua state. */
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TValue tokval; /* Current token value. */
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TValue lookaheadval; /* Lookahead token value. */
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const char *p; /* Current position in input buffer. */
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const char *pe; /* End of input buffer. */
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LexChar c; /* Current character. */
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LexToken tok; /* Current token. */
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LexToken lookahead; /* Lookahead token. */
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SBuf sb; /* String buffer for tokens. */
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lua_Reader rfunc; /* Reader callback. */
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void *rdata; /* Reader callback data. */
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BCLine linenumber; /* Input line counter. */
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BCLine lastline; /* Line of last token. */
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GCstr *chunkname; /* Current chunk name (interned string). */
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const char *chunkarg; /* Chunk name argument. */
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const char *mode; /* Allow loading bytecode (b) and/or source text (t). */
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VarInfo *vstack; /* Stack for names and extents of local variables. */
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MSize sizevstack; /* Size of variable stack. */
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MSize vtop; /* Top of variable stack. */
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BCInsLine *bcstack; /* Stack for bytecode instructions/line numbers. */
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MSize sizebcstack; /* Size of bytecode stack. */
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uint32_t level; /* Syntactical nesting level. */
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int endmark; /* Trust bytecode end marker, even if not at EOF. */
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} LexState;
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LJ_FUNC int lj_lex_setup(lua_State *L, LexState *ls);
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LJ_FUNC void lj_lex_cleanup(lua_State *L, LexState *ls);
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LJ_FUNC void lj_lex_next(LexState *ls);
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LJ_FUNC LexToken lj_lex_lookahead(LexState *ls);
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LJ_FUNC const char *lj_lex_token2str(LexState *ls, LexToken tok);
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LJ_FUNC_NORET void lj_lex_error(LexState *ls, LexToken tok, ErrMsg em, ...);
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LJ_FUNC void lj_lex_init(lua_State *L);
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#ifdef LUA_USE_ASSERT
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#define lj_assertLS(c, ...) (lj_assertG_(G(ls->L), (c), __VA_ARGS__))
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#else
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#define lj_assertLS(c, ...) ((void)ls)
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#endif
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#endif
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