/*** $Id: lparser.h,v 1.74 2014/10/25 11:50:46 roberto Exp $** Lua Parser** See Copyright Notice in lua.h*/#ifndef lparser_h#define lparser_h#include "llimits.h"#include "lobject.h"#include "lzio.h"/*** Expression descriptor*/typedef enum { VVOID, /* no value */ VNIL, VTRUE, VFALSE, VK, /* info = index of constant in 'k' */ VKFLT, /* nval = numerical float value */ VKINT, /* nval = numerical integer value */ VNONRELOC, /* info = result register */ VLOCAL, /* info = local register */ VUPVAL, /* info = index of upvalue in 'upvalues' */ VINDEXED, /* t = table register/upvalue; idx = index R/K */ VJMP, /* info = instruction pc */ VRELOCABLE, /* info = instruction pc */ VCALL, /* info = instruction pc */ VVARARG /* info = instruction pc */} expkind;#define vkisvar(k) (VLOCAL <= (k) && (k) <= VINDEXED)#define vkisinreg(k) ((k) == VNONRELOC || (k) == VLOCAL)typedef struct expdesc { expkind k; union { struct { /* for indexed variables (VINDEXED) */ short idx; /* index (R/K) */ lu_byte t; /* table (register or upvalue) */ lu_byte vt; /* whether 't' is register (VLOCAL) or upvalue (VUPVAL) */ } ind; int info; /* for generic use */ lua_Number nval; /* for VKFLT */ lua_Integer ival; /* for VKINT */ } u; int t; /* patch list of 'exit when true' */ int f; /* patch list of 'exit when false' */} expdesc;/* description of active local variable */typedef struct Vardesc { short idx; /* variable index in stack */} Vardesc;/* description of pending goto statements and label statements */typedef struct Labeldesc { TString *name; /* label identifier */ int pc; /* position in code */ int line; /* line where it appeared */ lu_byte nactvar; /* local level where it appears in current block */} Labeldesc;/* list of labels or gotos */typedef struct Labellist { Labeldesc *arr; /* array */ int n; /* number of entries in use */ int size; /* array size */} Labellist;/* dynamic structures used by the parser */typedef struct Dyndata { struct { /* list of active local variables */ Vardesc *arr; int n; int size; } actvar; Labellist gt; /* list of pending gotos */ Labellist label; /* list of active labels */} Dyndata;/* control of blocks */struct BlockCnt; /* defined in lparser.c *//* 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 BlockCnt *bl; /* chain of current blocks */ int pc; /* next position to code (equivalent to 'ncode') */ int lasttarget; /* 'label' of last 'jump label' */ int jpc; /* list of pending jumps to 'pc' */ int nk; /* number of elements in 'k' */ int np; /* number of elements in 'p' */ int firstlocal; /* index of first local var (in Dyndata array) */ short nlocvars; /* number of elements in 'f->locvars' */ lu_byte nactvar; /* number of active local variables */ lu_byte nups; /* number of upvalues */ lu_byte freereg; /* first free register */} FuncState;LUAI_FUNC LClosure *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, Dyndata *dyd, const char *name, int firstchar);#endif
/*
** $Id: lparser.h,v 1.74 2014/10/25 11:50:46 roberto Exp $
** Lua Parser
** See Copyright Notice in lua.h
*/
#ifndef lparser_h
#define lparser_h
#include "llimits.h"
#include "lobject.h"
#include "lzio.h"
/*
** Expression descriptor
*/
typedef enum {
VVOID, /* no value */
VNIL,
VTRUE,
VFALSE,
VK, /* info = index of constant in 'k' */
VKFLT, /* nval = numerical float value */
VKINT, /* nval = numerical integer value */
VNONRELOC, /* info = result register */
VLOCAL, /* info = local register */
VUPVAL, /* info = index of upvalue in 'upvalues' */
VINDEXED, /* t = table register/upvalue; idx = index R/K */
VJMP, /* info = instruction pc */
VRELOCABLE, /* info = instruction pc */
VCALL, /* info = instruction pc */
VVARARG /* info = instruction pc */
} expkind;
#define vkisvar(k) (VLOCAL <= (k) && (k) <= VINDEXED)
#define vkisinreg(k) ((k) == VNONRELOC || (k) == VLOCAL)
typedef struct expdesc {
expkind k;
union {
struct { /* for indexed variables (VINDEXED) */
short idx; /* index (R/K) */
lu_byte t; /* table (register or upvalue) */
lu_byte vt; /* whether 't' is register (VLOCAL) or upvalue (VUPVAL) */
} ind;
int info; /* for generic use */
lua_Number nval; /* for VKFLT */
lua_Integer ival; /* for VKINT */
} u;
int t; /* patch list of 'exit when true' */
int f; /* patch list of 'exit when false' */
} expdesc;
/* description of active local variable */
typedef struct Vardesc {
short idx; /* variable index in stack */
} Vardesc;
/* description of pending goto statements and label statements */
typedef struct Labeldesc {
TString *name; /* label identifier */
int pc; /* position in code */
int line; /* line where it appeared */
lu_byte nactvar; /* local level where it appears in current block */
} Labeldesc;
/* list of labels or gotos */
typedef struct Labellist {
Labeldesc *arr; /* array */
int n; /* number of entries in use */
int size; /* array size */
} Labellist;
/* dynamic structures used by the parser */
typedef struct Dyndata {
struct { /* list of active local variables */
Vardesc *arr;
int n;
int size;
} actvar;
Labellist gt; /* list of pending gotos */
Labellist label; /* list of active labels */
} Dyndata;
/* control of blocks */
struct BlockCnt; /* defined in lparser.c */
/* 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 BlockCnt *bl; /* chain of current blocks */
int pc; /* next position to code (equivalent to 'ncode') */
int lasttarget; /* 'label' of last 'jump label' */
int jpc; /* list of pending jumps to 'pc' */
int nk; /* number of elements in 'k' */
int np; /* number of elements in 'p' */
int firstlocal; /* index of first local var (in Dyndata array) */
short nlocvars; /* number of elements in 'f->locvars' */
lu_byte nactvar; /* number of active local variables */
lu_byte nups; /* number of upvalues */
lu_byte freereg; /* first free register */
} FuncState;
LUAI_FUNC LClosure *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff,
Dyndata *dyd, const char *name, int firstchar);
#endif