/*** $Id: lfunc.c,v 2.45 2014/11/02 19:19:04 roberto Exp $** Auxiliary functions to manipulate prototypes and closures** See Copyright Notice in lua.h*/ #define lfunc_c#define LUA_CORE #include "lprefix.h" #include <stddef.h> #include "lua.h" #include "lfunc.h"#include "lgc.h"#include "lmem.h"#include "lobject.h"#include "lstate.h" CClosure *luaF_newCclosure (lua_State *L, int n) { GCObject *o = luaC_newobj(L, LUA_TCCL, sizeCclosure(n)); CClosure *c = gco2ccl(o); c->nupvalues = cast_byte(n); return c;} LClosure *luaF_newLclosure (lua_State *L, int n) { GCObject *o = luaC_newobj(L, LUA_TLCL, sizeLclosure(n)); LClosure *c = gco2lcl(o); c->p = NULL; c->nupvalues = cast_byte(n); while (n--) c->upvals[n] = NULL; return c;} /*** fill a closure with new closed upvalues*/void luaF_initupvals (lua_State *L, LClosure *cl) { int i; for (i = 0; i < cl->nupvalues; i++) { UpVal *uv = luaM_new(L, UpVal); uv->refcount = 1; uv->v = &uv->u.value; /* make it closed */ setnilvalue(uv->v); cl->upvals[i] = uv; }} UpVal *luaF_findupval (lua_State *L, StkId level) { UpVal **pp = &L->openupval; UpVal *p; UpVal *uv; lua_assert(isintwups(L) || L->openupval == NULL); while (*pp != NULL && (p = *pp)->v >= level) { lua_assert(upisopen(p)); if (p->v == level) /* found a corresponding upvalue? */ return p; /* return it */ pp = &p->u.open.next; } /* not found: create a new upvalue */ uv = luaM_new(L, UpVal); uv->refcount = 0; uv->u.open.next = *pp; /* link it to list of open upvalues */ uv->u.open.touched = 1; *pp = uv; uv->v = level; /* current value lives in the stack */ if (!isintwups(L)) { /* thread not in list of threads with upvalues? */ L->twups = G(L)->twups; /* link it to the list */ G(L)->twups = L; } return uv;} void luaF_close (lua_State *L, StkId level) { UpVal *uv; while (L->openupval != NULL && (uv = L->openupval)->v >= level) { lua_assert(upisopen(uv)); L->openupval = uv->u.open.next; /* remove from 'open' list */ if (uv->refcount == 0) /* no references? */ luaM_free(L, uv); /* free upvalue */ else { setobj(L, &uv->u.value, uv->v); /* move value to upvalue slot */ uv->v = &uv->u.value; /* now current value lives here */ luaC_upvalbarrier(L, uv); } }} Proto *luaF_newproto (lua_State *L) { GCObject *o = luaC_newobj(L, LUA_TPROTO, sizeof(Proto)); Proto *f = gco2p(o); f->k = NULL; f->sizek = 0; f->p = NULL; f->sizep = 0; f->code = NULL; f->cache = NULL; f->sizecode = 0; f->lineinfo = NULL; f->sizelineinfo = 0; f->upvalues = NULL; f->sizeupvalues = 0; f->numparams = 0; f->is_vararg = 0; f->maxstacksize = 0; f->locvars = NULL; f->sizelocvars = 0; f->linedefined = 0; f->lastlinedefined = 0; f->source = NULL; return f;} void luaF_freeproto (lua_State *L, Proto *f) { luaM_freearray(L, f->code, f->sizecode); luaM_freearray(L, f->p, f->sizep); luaM_freearray(L, f->k, f->sizek); luaM_freearray(L, f->lineinfo, f->sizelineinfo); luaM_freearray(L, f->locvars, f->sizelocvars); luaM_freearray(L, f->upvalues, f->sizeupvalues); luaM_free(L, f);} /*** Look for n-th local variable at line 'line' in function 'func'.** Returns NULL if not found.*/const char *luaF_getlocalname (const Proto *f, int local_number, int pc) { int i; for (i = 0; i<f->sizelocvars && f->locvars[i].startpc <= pc; i++) { if (pc < f->locvars[i].endpc) { /* is variable active? */ local_number--; if (local_number == 0) return getstr(f->locvars[i].varname); } } return NULL; /* not found */}
/*
** $Id: lfunc.c,v 2.45 2014/11/02 19:19:04 roberto Exp $
** Auxiliary functions to manipulate prototypes and closures
** See Copyright Notice in lua.h
*/
#define lfunc_c
#define LUA_CORE
#include "lprefix.h"
#include <stddef.h>
#include "lua.h"
#include "lfunc.h"
#include "lgc.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
CClosure *luaF_newCclosure (lua_State *L, int n) {
GCObject *o = luaC_newobj(L, LUA_TCCL, sizeCclosure(n));
CClosure *c = gco2ccl(o);
c->nupvalues = cast_byte(n);
return c;
}
LClosure *luaF_newLclosure (lua_State *L, int n) {
GCObject *o = luaC_newobj(L, LUA_TLCL, sizeLclosure(n));
LClosure *c = gco2lcl(o);
c->p = NULL;
c->nupvalues = cast_byte(n);
while (n--) c->upvals[n] = NULL;
return c;
}
/*
** fill a closure with new closed upvalues
*/
void luaF_initupvals (lua_State *L, LClosure *cl) {
int i;
for (i = 0; i < cl->nupvalues; i++) {
UpVal *uv = luaM_new(L, UpVal);
uv->refcount = 1;
uv->v = &uv->u.value; /* make it closed */
setnilvalue(uv->v);
cl->upvals[i] = uv;
}
}
UpVal *luaF_findupval (lua_State *L, StkId level) {
UpVal **pp = &L->openupval;
UpVal *p;
UpVal *uv;
lua_assert(isintwups(L) || L->openupval == NULL);
while (*pp != NULL && (p = *pp)->v >= level) {
lua_assert(upisopen(p));
if (p->v == level) /* found a corresponding upvalue? */
return p; /* return it */
pp = &p->u.open.next;
}
/* not found: create a new upvalue */
uv = luaM_new(L, UpVal);
uv->refcount = 0;
uv->u.open.next = *pp; /* link it to list of open upvalues */
uv->u.open.touched = 1;
*pp = uv;
uv->v = level; /* current value lives in the stack */
if (!isintwups(L)) { /* thread not in list of threads with upvalues? */
L->twups = G(L)->twups; /* link it to the list */
G(L)->twups = L;
}
return uv;
}
void luaF_close (lua_State *L, StkId level) {
UpVal *uv;
while (L->openupval != NULL && (uv = L->openupval)->v >= level) {
lua_assert(upisopen(uv));
L->openupval = uv->u.open.next; /* remove from 'open' list */
if (uv->refcount == 0) /* no references? */
luaM_free(L, uv); /* free upvalue */
else {
setobj(L, &uv->u.value, uv->v); /* move value to upvalue slot */
uv->v = &uv->u.value; /* now current value lives here */
luaC_upvalbarrier(L, uv);
}
}
}
Proto *luaF_newproto (lua_State *L) {
GCObject *o = luaC_newobj(L, LUA_TPROTO, sizeof(Proto));
Proto *f = gco2p(o);
f->k = NULL;
f->sizek = 0;
f->p = NULL;
f->sizep = 0;
f->code = NULL;
f->cache = NULL;
f->sizecode = 0;
f->lineinfo = NULL;
f->sizelineinfo = 0;
f->upvalues = NULL;
f->sizeupvalues = 0;
f->numparams = 0;
f->is_vararg = 0;
f->maxstacksize = 0;
f->locvars = NULL;
f->sizelocvars = 0;
f->linedefined = 0;
f->lastlinedefined = 0;
f->source = NULL;
return f;
}
void luaF_freeproto (lua_State *L, Proto *f) {
luaM_freearray(L, f->code, f->sizecode);
luaM_freearray(L, f->p, f->sizep);
luaM_freearray(L, f->k, f->sizek);
luaM_freearray(L, f->lineinfo, f->sizelineinfo);
luaM_freearray(L, f->locvars, f->sizelocvars);
luaM_freearray(L, f->upvalues, f->sizeupvalues);
luaM_free(L, f);
}
/*
** Look for n-th local variable at line 'line' in function 'func'.
** Returns NULL if not found.
*/
const char *luaF_getlocalname (const Proto *f, int local_number, int pc) {
int i;
for (i = 0; i<f->sizelocvars && f->locvars[i].startpc <= pc; i++) {
if (pc < f->locvars[i].endpc) { /* is variable active? */
local_number--;
if (local_number == 0)
return getstr(f->locvars[i].varname);
}
}
return NULL; /* not found */
}