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106 lines
2.9 KiB
106 lines
2.9 KiB
/*
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* Bug in test262 test case: ch15/15.12/15.12.2/S15.12.2_A1
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*
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* Duktape does not parse __proto__ as a concrete property when ES6
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* __proto__ property is enabled, but rather sets the object prototype.
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*/
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/*===
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basic case
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[object Object]
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object
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true
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false
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true
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[object Object]
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===*/
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/*===
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reviver case
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reviver: __proto__
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reviver:
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[object Object]
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object
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true
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false
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true
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[object Object]
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===*/
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/*===
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complex reviver case
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reviver: foo [object Object] bar
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before: this.__proto__: [object Object]
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after: this.__proto__: undefined
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reviver: __proto__ undefined [object Object]
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reviver: [object Object] [object Object]
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[object Object]
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object
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true
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false
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true
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[object Object]
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===*/
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function test() {
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var x;
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function dump(x) {
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print(x);
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print(typeof x);
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print(x instanceof Object);
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print(x instanceof Array);
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print('__proto__' in x);
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print(Object.getOwnPropertyDescriptor(x, '__proto__'));
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}
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// Basic parse case
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print('basic case');
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dump(JSON.parse('{"__proto__":[]}'));
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// Similar issue triggered when reviving '__proto__'
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print('reviver case');
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dump(JSON.parse('{"__proto__":[]}', function (name, val) {
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// this=holder
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print('reviver:', name);
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return val;
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}));
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// Here the reviver is quite devious, and modifies the holder
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// so that an own property '__proto__' is removed before that
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// property is revived. Because Duktape writes the replacement
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// value with duk_put_prop() now (in duk_bi_json.c), this runs
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// the risk of doing a normal property put on __proto__ with no
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// such own property in the object -- which then changes the
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// prototype of the result (which is incorrect).
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print('complex reviver case');
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dump(JSON.parse('{"foo":"bar", "__proto__":[1,2,3]}', function (name, val) {
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// this=holder
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print('reviver:', name, Object.getOwnPropertyDescriptor(this, name), val);
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if (name === 'foo') {
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// Delete '__proto__' while reviving 'foo'.
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print('before: this.__proto__:', Object.getOwnPropertyDescriptor(this, '__proto__'));
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delete this.__proto__;
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print('after: this.__proto__:', Object.getOwnPropertyDescriptor(this, '__proto__'));
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}
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if (name === '__proto__') {
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// Since __proto__ is deleted, duk_bi_json.c will read its value as
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// Object.prototype (= val) before calling us. That's why the test
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// case prints out Object.getOwnPropertyDescriptor(this, name) returning
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// undefined, but 'val' being '[object Object']. Force an array return
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// so that it gets (incorrectly) written to __proto__ using duk_put_prop().
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// The correct behavior here would be to set it as an own property.
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return [];
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}
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return val;
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}));
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}
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try {
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test();
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} catch (e) {
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print(e);
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}
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