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/*
** Auxiliary functions to manipulate prototypes and closures
** See Copyright Notice in lua.h
*/
#define FORBIDDEN_SYMBOL_EXCEPTION_setjmp
#define FORBIDDEN_SYMBOL_EXCEPTION_longjmp
#include "engines/grim/lua/lfunc.h"
#include "engines/grim/lua/lmem.h"
#include "engines/grim/lua/lstate.h"
namespace Grim {
#define gcsizeproto(p) 5 /* approximate "weight" for a prototype */
#define gcsizeclosure(c) 1 /* approximate "weight" for a closure */
Closure *luaF_newclosure(int32 nelems) {
Closure *c = (Closure *)luaM_malloc(sizeof(Closure) + nelems * sizeof(TObject));
luaO_insertlist(&rootcl, (GCnode *)c);
nblocks += gcsizeclosure(c);
c->nelems = nelems;
return c;
}
TProtoFunc *luaF_newproto() {
TProtoFunc *f = luaM_new(TProtoFunc);
f->code = nullptr;
f->lineDefined = 0;
f->fileName = nullptr;
f->consts = nullptr;
f->nconsts = 0;
f->locvars = nullptr;
luaO_insertlist(&rootproto, (GCnode *)f);
nblocks += gcsizeproto(f);
return f;
}
static void freefunc(TProtoFunc *f) {
luaM_free(f->code);
luaM_free(f->locvars);
luaM_free(f->consts);
luaM_free(f);
}
void luaF_freeproto(TProtoFunc *l) {
while (l) {
TProtoFunc *next = (TProtoFunc *)l->head.next;
nblocks -= gcsizeproto(l);
freefunc(l);
l = next;
}
}
void luaF_freeclosure(Closure *l) {
while (l) {
Closure *next = (Closure *)l->head.next;
nblocks -= gcsizeclosure(l);
luaM_free(l);
l = next;
}
}
/*
** Look for n-th local variable at line "line" in function "func".
** Returns NULL if not found.
*/
char *luaF_getlocalname (TProtoFunc *func, int32 local_number, int32 line) {
int32 count = 0;
char *varname = nullptr;
LocVar *lv = func->locvars;
if (!lv)
return nullptr;
for (; lv->line != -1 && lv->line < line; lv++) {
if (lv->varname) { // register
if (++count == local_number)
varname = lv->varname->str;
} else { // unregister
if (--count < local_number) {
varname = nullptr;
}
}
}
return varname;
}
} // end of namespace Grim
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