53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
/*
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* Misc support functions
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*/
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#include "duk_internal.h"
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DUK_INTERNAL duk_bool_t duk_hobject_prototype_chain_contains(duk_hthread *thr, duk_hobject *h, duk_hobject *p, duk_bool_t ignore_loop) {
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duk_uint_t sanity;
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DUK_ASSERT(thr != NULL);
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/* False if the object is NULL or the prototype 'p' is NULL.
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* In particular, false if both are NULL (don't compare equal).
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*/
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if (h == NULL || p == NULL) {
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return 0;
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}
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sanity = DUK_HOBJECT_PROTOTYPE_CHAIN_SANITY;
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do {
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if (h == p) {
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return 1;
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}
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if (sanity-- == 0) {
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if (ignore_loop) {
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break;
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} else {
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DUK_ERROR_RANGE(thr, DUK_STR_PROTOTYPE_CHAIN_LIMIT);
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DUK_WO_NORETURN(return 0;);
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}
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}
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h = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, h);
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} while (h);
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return 0;
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}
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DUK_INTERNAL void duk_hobject_set_prototype_updref(duk_hthread *thr, duk_hobject *h, duk_hobject *p) {
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#if defined(DUK_USE_REFERENCE_COUNTING)
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duk_hobject *tmp;
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DUK_ASSERT(h);
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tmp = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, h);
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DUK_HOBJECT_SET_PROTOTYPE(thr->heap, h, p);
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DUK_HOBJECT_INCREF_ALLOWNULL(thr, p); /* avoid problems if p == h->prototype */
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DUK_HOBJECT_DECREF_ALLOWNULL(thr, tmp);
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#else
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DUK_ASSERT(h);
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DUK_UNREF(thr);
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DUK_HOBJECT_SET_PROTOTYPE(thr->heap, h, p);
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#endif
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}
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