mirror of
https://github.com/lua/lua.git
synced 2024-11-24 18:53:46 +08:00
136 lines
3.4 KiB
C
136 lines
3.4 KiB
C
/*
|
|
** $Id: lfunc.c,v 1.65 2002/12/19 11:11:55 roberto Exp roberto $
|
|
** Auxiliary functions to manipulate prototypes and closures
|
|
** See Copyright Notice in lua.h
|
|
*/
|
|
|
|
|
|
#include <stdlib.h>
|
|
|
|
#define lfunc_c
|
|
|
|
#include "lua.h"
|
|
|
|
#include "lfunc.h"
|
|
#include "lgc.h"
|
|
#include "lmem.h"
|
|
#include "lobject.h"
|
|
#include "lstate.h"
|
|
|
|
|
|
#define sizeCclosure(n) (cast(int, sizeof(CClosure)) + \
|
|
cast(int, sizeof(TObject)*((n)-1)))
|
|
|
|
#define sizeLclosure(n) (cast(int, sizeof(LClosure)) + \
|
|
cast(int, sizeof(TObject *)*((n)-1)))
|
|
|
|
|
|
|
|
Closure *luaF_newCclosure (lua_State *L, int nelems) {
|
|
Closure *c = cast(Closure *, luaM_malloc(L, sizeCclosure(nelems)));
|
|
luaC_link(L, valtogco(c), LUA_TFUNCTION);
|
|
c->c.isC = 1;
|
|
c->c.nupvalues = cast(lu_byte, nelems);
|
|
return c;
|
|
}
|
|
|
|
|
|
Closure *luaF_newLclosure (lua_State *L, int nelems, TObject *gt) {
|
|
Closure *c = cast(Closure *, luaM_malloc(L, sizeLclosure(nelems)));
|
|
luaC_link(L, valtogco(c), LUA_TFUNCTION);
|
|
c->l.isC = 0;
|
|
c->l.g = *gt;
|
|
c->l.nupvalues = cast(lu_byte, nelems);
|
|
return c;
|
|
}
|
|
|
|
|
|
UpVal *luaF_findupval (lua_State *L, StkId level) {
|
|
GCObject **pp = &L->openupval;
|
|
UpVal *p;
|
|
UpVal *v;
|
|
while ((p = ngcotouv(*pp)) != NULL && p->v >= level) {
|
|
if (p->v == level) return p;
|
|
pp = &p->next;
|
|
}
|
|
v = luaM_new(L, UpVal); /* not found: create a new one */
|
|
v->tt = LUA_TUPVAL;
|
|
v->marked = 1; /* open upvalues should not be collected */
|
|
v->v = level; /* current value lives in the stack */
|
|
v->next = *pp; /* chain it in the proper position */
|
|
*pp = valtogco(v);
|
|
return v;
|
|
}
|
|
|
|
|
|
void luaF_close (lua_State *L, StkId level) {
|
|
UpVal *p;
|
|
while ((p = ngcotouv(L->openupval)) != NULL && p->v >= level) {
|
|
setobj(&p->value, p->v); /* save current value (write barrier) */
|
|
p->v = &p->value; /* now current value lives here */
|
|
L->openupval = p->next; /* remove from `open' list */
|
|
luaC_link(L, valtogco(p), LUA_TUPVAL);
|
|
}
|
|
}
|
|
|
|
|
|
Proto *luaF_newproto (lua_State *L) {
|
|
Proto *f = luaM_new(L, Proto);
|
|
luaC_link(L, valtogco(f), LUA_TPROTO);
|
|
f->k = NULL;
|
|
f->sizek = 0;
|
|
f->p = NULL;
|
|
f->sizep = 0;
|
|
f->code = NULL;
|
|
f->sizecode = 0;
|
|
f->sizelineinfo = 0;
|
|
f->sizeupvalues = 0;
|
|
f->nups = 0;
|
|
f->upvalues = NULL;
|
|
f->numparams = 0;
|
|
f->is_vararg = 0;
|
|
f->maxstacksize = 0;
|
|
f->lineinfo = NULL;
|
|
f->sizelocvars = 0;
|
|
f->locvars = NULL;
|
|
f->lineDefined = 0;
|
|
f->source = NULL;
|
|
return f;
|
|
}
|
|
|
|
|
|
void luaF_freeproto (lua_State *L, Proto *f) {
|
|
luaM_freearray(L, f->code, f->sizecode, Instruction);
|
|
luaM_freearray(L, f->p, f->sizep, Proto *);
|
|
luaM_freearray(L, f->k, f->sizek, TObject);
|
|
luaM_freearray(L, f->lineinfo, f->sizelineinfo, int);
|
|
luaM_freearray(L, f->locvars, f->sizelocvars, struct LocVar);
|
|
luaM_freearray(L, f->upvalues, f->sizeupvalues, TString *);
|
|
luaM_freelem(L, f);
|
|
}
|
|
|
|
|
|
void luaF_freeclosure (lua_State *L, Closure *c) {
|
|
int size = (c->c.isC) ? sizeCclosure(c->c.nupvalues) :
|
|
sizeLclosure(c->l.nupvalues);
|
|
luaM_free(L, c, size);
|
|
}
|
|
|
|
|
|
/*
|
|
** 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 */
|
|
}
|
|
|