mirror of https://github.com/lua/lua
88 lines
2.0 KiB
C
88 lines
2.0 KiB
C
/*
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** $Id: lfunc.c,v 1.36 2000/12/28 12:55:41 roberto Exp roberto $
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** Auxiliary functions to manipulate prototypes and closures
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** See Copyright Notice in lua.h
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*/
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#include <stdlib.h>
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#include "lua.h"
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#include "lfunc.h"
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#include "lmem.h"
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#include "lstate.h"
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#define sizeclosure(n) ((int)sizeof(Closure) + (int)sizeof(TObject)*((n)-1))
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Closure *luaF_newclosure (lua_State *L, int nelems) {
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Closure *c = (Closure *)luaM_malloc(L, sizeclosure(nelems));
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c->next = G(L)->rootcl;
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G(L)->rootcl = c;
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c->mark = c;
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c->nupvalues = nelems;
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return c;
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}
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Proto *luaF_newproto (lua_State *L) {
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Proto *f = luaM_new(L, Proto);
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f->knum = NULL;
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f->sizeknum = 0;
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f->kstr = NULL;
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f->sizekstr = 0;
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f->kproto = NULL;
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f->sizekproto = 0;
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f->code = NULL;
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f->sizecode = 0;
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f->numparams = 0;
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f->is_vararg = 0;
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f->maxstacksize = 0;
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f->marked = 0;
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f->lineinfo = NULL;
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f->sizelocvars = 0;
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f->sizelineinfo = 0;
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f->locvars = NULL;
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f->lineDefined = 0;
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f->source = NULL;
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f->next = G(L)->rootproto; /* chain in list of protos */
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G(L)->rootproto = f;
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return f;
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}
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void luaF_freeproto (lua_State *L, Proto *f) {
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luaM_freearray(L, f->code, f->sizecode, Instruction);
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luaM_freearray(L, f->locvars, f->sizelocvars, struct LocVar);
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luaM_freearray(L, f->kstr, f->sizekstr, TString *);
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luaM_freearray(L, f->knum, f->sizeknum, lua_Number);
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luaM_freearray(L, f->kproto, f->sizekproto, Proto *);
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luaM_freearray(L, f->lineinfo, f->sizelineinfo, int);
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luaM_freelem(L, f, Proto);
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}
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void luaF_freeclosure (lua_State *L, Closure *c) {
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luaM_free(L, c, sizeclosure(c->nupvalues));
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}
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/*
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** Look for n-th local variable at line `line' in function `func'.
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** Returns NULL if not found.
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*/
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const char *luaF_getlocalname (const Proto *f, int local_number, int pc) {
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int i;
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for (i = 0; i<f->sizelocvars && f->locvars[i].startpc <= pc; i++) {
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if (pc < f->locvars[i].endpc) { /* is variable active? */
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local_number--;
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if (local_number == 0)
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return f->locvars[i].varname->str;
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}
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}
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return NULL; /* not found */
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}
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