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