mirror of
https://github.com/scummvm/scummvm.git
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87 lines
1.9 KiB
C++
87 lines
1.9 KiB
C++
/*
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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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#define FORBIDDEN_SYMBOL_EXCEPTION_setjmp
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#define FORBIDDEN_SYMBOL_EXCEPTION_longjmp
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#include "engines/grim/lua/lfunc.h"
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#include "engines/grim/lua/lmem.h"
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#include "engines/grim/lua/lstate.h"
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namespace Grim {
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#define gcsizeproto(p) 5 /* approximate "weight" for a prototype */
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#define gcsizeclosure(c) 1 /* approximate "weight" for a closure */
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Closure *luaF_newclosure(int32 nelems) {
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Closure *c = (Closure *)luaM_malloc(sizeof(Closure) + nelems * sizeof(TObject));
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luaO_insertlist(&rootcl, (GCnode *)c);
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nblocks += gcsizeclosure(c);
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c->nelems = nelems;
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return c;
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}
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TProtoFunc *luaF_newproto() {
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TProtoFunc *f = luaM_new(TProtoFunc);
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f->code = nullptr;
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f->lineDefined = 0;
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f->fileName = nullptr;
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f->consts = nullptr;
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f->nconsts = 0;
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f->locvars = nullptr;
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luaO_insertlist(&rootproto, (GCnode *)f);
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nblocks += gcsizeproto(f);
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return f;
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}
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static void freefunc(TProtoFunc *f) {
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luaM_free(f->code);
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luaM_free(f->locvars);
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luaM_free(f->consts);
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luaM_free(f);
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}
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void luaF_freeproto(TProtoFunc *l) {
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while (l) {
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TProtoFunc *next = (TProtoFunc *)l->head.next;
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nblocks -= gcsizeproto(l);
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freefunc(l);
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l = next;
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}
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}
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void luaF_freeclosure(Closure *l) {
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while (l) {
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Closure *next = (Closure *)l->head.next;
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nblocks -= gcsizeclosure(l);
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luaM_free(l);
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l = next;
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}
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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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char *luaF_getlocalname (TProtoFunc *func, int32 local_number, int32 line) {
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int32 count = 0;
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char *varname = nullptr;
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LocVar *lv = func->locvars;
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if (!lv)
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return nullptr;
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for (; lv->line != -1 && lv->line < line; lv++) {
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if (lv->varname) { // register
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if (++count == local_number)
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varname = lv->varname->str;
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} else { // unregister
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if (--count < local_number) {
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varname = nullptr;
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}
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}
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}
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return varname;
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}
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} // end of namespace Grim
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