mirror of https://github.com/lua/lua
85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
/*
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** $Id: lparser.h,v 1.1 2001/11/29 22:14:34 rieru Exp rieru $
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** Lua Parser
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** See Copyright Notice in lua.h
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*/
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#ifndef lparser_h
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#define lparser_h
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#include "llimits.h"
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#include "lobject.h"
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#include "ltable.h"
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#include "lzio.h"
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/* small implementation of bit arrays */
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#define BPW (CHAR_BIT*sizeof(unsigned int)) /* bits per word */
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#define words2bits(b) (((b)-1)/BPW + 1)
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#define setbit(a, b) ((a)[(b)/BPW] |= (1 << (b)%BPW))
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#define resetbit(a, b) ((a)[(b)/BPW] &= ~((1 << (b)%BPW)))
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#define testbit(a, b) ((a)[(b)/BPW] & (1 << (b)%BPW))
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/*
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** Expression descriptor
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*/
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typedef enum {
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VVOID, /* no value */
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VNIL,
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VTRUE,
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VFALSE,
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VK, /* info = index of constant in `k' */
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VLOCAL, /* info = local register */
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VUPVAL, /* info = index of upvalue in `upvalues' */
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VGLOBAL, /* info = index of global name in `k' */
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VINDEXED, /* info = table register; aux = index register (or `k') */
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VRELOCABLE, /* info = instruction pc */
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VNONRELOC, /* info = result register */
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VJMP, /* info = result register */
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VCALL /* info = result register */
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} expkind;
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typedef struct expdesc {
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expkind k;
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int info, aux;
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int t; /* patch list of `exit when true' */
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int f; /* patch list of `exit when false' */
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} expdesc;
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/* state needed to generate code for a given function */
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typedef struct FuncState {
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Proto *f; /* current function header */
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struct FuncState *prev; /* enclosing function */
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struct LexState *ls; /* lexical state */
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struct lua_State *L; /* copy of the Lua state */
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int pc; /* next position to code (equivalent to `ncode') */
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int lasttarget; /* `pc' of last `jump target' */
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int jlt; /* list of jumps to `lasttarget' */
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int freereg; /* first free register */
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int nk; /* number of elements in `k' */
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Table *h; /* table to find (and reuse) elements in `k' */
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int np; /* number of elements in `p' */
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int nlineinfo; /* number of elements in `lineinfo' */
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int nlocvars; /* number of elements in `locvars' */
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int nactloc; /* number of active local variables */
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int lastline; /* line where last `lineinfo' was generated */
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struct Breaklabel *bl; /* chain of breakable blocks */
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expdesc upvalues[MAXUPVALUES]; /* upvalues */
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int actloc[MAXLOCALS]; /* local-variable stack (indices to locvars) */
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unsigned int wasup[words2bits(MAXLOCALS)]; /* bit array to mark whether a
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local variable was used as upvalue at some level */
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} FuncState;
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Proto *luaY_parser (lua_State *L, ZIO *z);
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#endif
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