75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
/*
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* Pointer built-ins
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*/
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#include "duk_internal.h"
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/*
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* Constructor
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*/
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DUK_INTERNAL duk_ret_t duk_bi_pointer_constructor(duk_hthread *thr) {
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/* XXX: this behavior is quite useless now; it would be nice to be able
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* to create pointer values from e.g. numbers or strings. Numbers are
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* problematic on 64-bit platforms though. Hex encoded strings?
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*/
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if (duk_get_top(thr) == 0) {
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duk_push_pointer(thr, NULL);
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} else {
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duk_to_pointer(thr, 0);
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}
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DUK_ASSERT(duk_is_pointer(thr, 0));
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duk_set_top(thr, 1);
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if (duk_is_constructor_call(thr)) {
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(void) duk_push_object_helper(thr,
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DUK_HOBJECT_FLAG_EXTENSIBLE |
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DUK_HOBJECT_FLAG_FASTREFS |
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DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_POINTER),
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DUK_BIDX_POINTER_PROTOTYPE);
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/* Pointer object internal value is immutable. */
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duk_dup_0(thr);
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duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_INT_VALUE, DUK_PROPDESC_FLAGS_NONE);
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}
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/* Note: unbalanced stack on purpose */
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return 1;
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}
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/*
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* toString(), valueOf()
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*/
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DUK_INTERNAL duk_ret_t duk_bi_pointer_prototype_tostring_shared(duk_hthread *thr) {
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duk_tval *tv;
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duk_small_int_t to_string = duk_get_current_magic(thr);
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duk_push_this(thr);
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tv = duk_require_tval(thr, -1);
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DUK_ASSERT(tv != NULL);
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if (DUK_TVAL_IS_POINTER(tv)) {
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/* nop */
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} else if (DUK_TVAL_IS_OBJECT(tv)) {
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duk_hobject *h = DUK_TVAL_GET_OBJECT(tv);
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DUK_ASSERT(h != NULL);
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/* Must be a "pointer object", i.e. class "Pointer" */
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if (DUK_HOBJECT_GET_CLASS_NUMBER(h) != DUK_HOBJECT_CLASS_POINTER) {
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goto type_error;
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}
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duk_xget_owndataprop_stridx_short(thr, -1, DUK_STRIDX_INT_VALUE);
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} else {
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goto type_error;
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}
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if (to_string) {
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duk_to_string(thr, -1);
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}
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return 1;
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type_error:
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DUK_DCERROR_TYPE_INVALID_ARGS(thr);
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}
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