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68 lines
2.4 KiB
68 lines
2.4 KiB
/*
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* Proxy built-in (ES6)
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*/
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#include "duk_internal.h"
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#if defined(DUK_USE_ES6_PROXY)
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DUK_INTERNAL duk_ret_t duk_bi_proxy_constructor(duk_context *ctx) {
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duk_hobject *h_target;
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duk_hobject *h_handler;
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duk_require_constructor_call(ctx);
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/* Reject a proxy object as the target because it would need
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* special handler in property lookups. (ES6 has no such restriction)
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*/
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h_target = duk_require_hobject_promote_mask(ctx, 0, DUK_TYPE_MASK_LIGHTFUNC | DUK_TYPE_MASK_BUFFER);
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DUK_ASSERT(h_target != NULL);
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if (DUK_HOBJECT_HAS_EXOTIC_PROXYOBJ(h_target)) {
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goto fail_args;
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}
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/* Reject a proxy object as the handler because it would cause
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* potentially unbounded recursion. (ES6 has no such restriction)
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*
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* There's little practical reason to use a lightfunc or a plain
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* buffer as the handler table: one could only provide traps via
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* their prototype objects (Function.prototype and ArrayBuffer.prototype).
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* Even so, as lightfuncs and plain buffers mimic their object
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* counterparts, they're promoted and accepted here.
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*/
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h_handler = duk_require_hobject_promote_mask(ctx, 1, DUK_TYPE_MASK_LIGHTFUNC | DUK_TYPE_MASK_BUFFER);
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DUK_ASSERT(h_handler != NULL);
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if (DUK_HOBJECT_HAS_EXOTIC_PROXYOBJ(h_handler)) {
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goto fail_args;
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}
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/* XXX: the returned value is exotic in ES6, but we use a
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* simple object here with no prototype. Without a prototype,
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* ToPrimitive() coercion fails which is a bit confusing.
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* No callable check/handling in the current Proxy subset.
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*/
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(void) duk_push_object_helper_proto(ctx,
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DUK_HOBJECT_FLAG_EXTENSIBLE |
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DUK_HOBJECT_FLAG_EXOTIC_PROXYOBJ |
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DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_OBJECT),
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NULL);
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DUK_ASSERT_TOP(ctx, 3);
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/* Make _Target and _Handler non-configurable and non-writable.
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* They can still be forcibly changed by C code (both user and
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* Duktape internal), but not by Ecmascript code.
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*/
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/* Proxy target */
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duk_dup_0(ctx);
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duk_xdef_prop_stridx(ctx, -2, DUK_STRIDX_INT_TARGET, DUK_PROPDESC_FLAGS_NONE);
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/* Proxy handler */
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duk_dup_1(ctx);
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duk_xdef_prop_stridx(ctx, -2, DUK_STRIDX_INT_HANDLER, DUK_PROPDESC_FLAGS_NONE);
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return 1; /* replacement handler */
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fail_args:
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DUK_DCERROR_TYPE_INVALID_ARGS((duk_hthread *) ctx);
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}
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#endif /* DUK_USE_ES6_PROXY */
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