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Unified Diff: test/unittests/value-serializer-unittest.cc

Issue 2246093003: Blink-compatible serialization of dictionary-like objects. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: nits Created 4 years, 4 months ago
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Index: test/unittests/value-serializer-unittest.cc
diff --git a/test/unittests/value-serializer-unittest.cc b/test/unittests/value-serializer-unittest.cc
index c48961fb6cddbb61ac4c2fa464af29ab925e0062..0648ff226b509a2955ce04eeac83a642a8f2f7ce 100644
--- a/test/unittests/value-serializer-unittest.cc
+++ b/test/unittests/value-serializer-unittest.cc
@@ -38,21 +38,49 @@ class ValueSerializerTest : public TestWithIsolate {
});
}
+ // Variant for the common case where a script is used to build the original
+ // value.
+ template <typename OutputFunctor>
+ void RoundTripTest(const char* source, const OutputFunctor& output_functor) {
+ RoundTripTest([this, source]() { return EvaluateScriptForInput(source); },
+ output_functor);
+ }
+
+ Maybe<std::vector<uint8_t>> DoEncode(Local<Value> value) {
+ // This approximates what the API implementation would do.
+ // TODO(jbroman): Use the public API once it exists.
+ i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate());
+ i::HandleScope handle_scope(internal_isolate);
+ i::ValueSerializer serializer(internal_isolate);
+ serializer.WriteHeader();
+ if (serializer.WriteObject(Utils::OpenHandle(*value)).FromMaybe(false)) {
+ return Just(serializer.ReleaseBuffer());
+ }
+ if (internal_isolate->has_pending_exception()) {
+ internal_isolate->OptionalRescheduleException(true);
+ }
+ return Nothing<std::vector<uint8_t>>();
+ }
+
template <typename InputFunctor, typename EncodedDataFunctor>
void EncodeTest(const InputFunctor& input_functor,
const EncodedDataFunctor& encoded_data_functor) {
Context::Scope scope(serialization_context());
TryCatch try_catch(isolate());
- // TODO(jbroman): Use the public API once it exists.
Local<Value> input_value = input_functor();
- i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate());
- i::HandleScope handle_scope(internal_isolate);
- i::ValueSerializer serializer;
- serializer.WriteHeader();
- ASSERT_TRUE(serializer.WriteObject(Utils::OpenHandle(*input_value))
- .FromMaybe(false));
+ std::vector<uint8_t> buffer;
+ ASSERT_TRUE(DoEncode(input_value).To(&buffer));
ASSERT_FALSE(try_catch.HasCaught());
- encoded_data_functor(serializer.ReleaseBuffer());
+ encoded_data_functor(buffer);
+ }
+
+ template <typename MessageFunctor>
+ void InvalidEncodeTest(const char* source, const MessageFunctor& functor) {
+ Context::Scope scope(serialization_context());
+ TryCatch try_catch(isolate());
+ Local<Value> input_value = EvaluateScriptForInput(source);
+ ASSERT_TRUE(DoEncode(input_value).IsNothing());
+ functor(try_catch.Message());
}
template <typename OutputFunctor>
@@ -388,5 +416,216 @@ TEST_F(ValueSerializerTest, EncodeTwoByteStringUsesPadding) {
});
}
+TEST_F(ValueSerializerTest, RoundTripDictionaryObject) {
+ // Empty object.
+ RoundTripTest("({})", [this](Local<Value> value) {
+ ASSERT_TRUE(value->IsObject());
+ EXPECT_TRUE(EvaluateScriptForResultBool(
+ "Object.getPrototypeOf(result) === Object.prototype"));
+ EXPECT_TRUE(EvaluateScriptForResultBool(
+ "Object.getOwnPropertyNames(result).length === 0"));
+ });
+ // String key.
+ RoundTripTest("({ a: 42 })", [this](Local<Value> value) {
+ ASSERT_TRUE(value->IsObject());
+ EXPECT_TRUE(EvaluateScriptForResultBool("result.hasOwnProperty('a')"));
+ EXPECT_TRUE(EvaluateScriptForResultBool("result.a === 42"));
+ EXPECT_TRUE(EvaluateScriptForResultBool(
+ "Object.getOwnPropertyNames(result).length === 1"));
+ });
+ // Integer key (treated as a string, but may be encoded differently).
+ RoundTripTest("({ 42: 'a' })", [this](Local<Value> value) {
+ ASSERT_TRUE(value->IsObject());
+ EXPECT_TRUE(EvaluateScriptForResultBool("result.hasOwnProperty('42')"));
+ EXPECT_TRUE(EvaluateScriptForResultBool("result[42] === 'a'"));
+ EXPECT_TRUE(EvaluateScriptForResultBool(
+ "Object.getOwnPropertyNames(result).length === 1"));
+ });
+ // Key order must be preserved.
+ RoundTripTest("({ x: 1, y: 2, a: 3 })", [this](Local<Value> value) {
+ EXPECT_TRUE(EvaluateScriptForResultBool(
+ "Object.getOwnPropertyNames(result).toString() === 'x,y,a'"));
+ });
+ // A harder case of enumeration order.
+ // Indexes first, in order (but not 2^32 - 1, which is not an index), then the
+ // remaining (string) keys, in the order they were defined.
+ RoundTripTest(
+ "({ a: 2, 0xFFFFFFFF: 1, 0xFFFFFFFE: 3, 1: 0 })",
+ [this](Local<Value> value) {
+ EXPECT_TRUE(EvaluateScriptForResultBool(
+ "Object.getOwnPropertyNames(result).toString() === "
+ "'1,4294967294,a,4294967295'"));
+ EXPECT_TRUE(EvaluateScriptForResultBool("result.a === 2"));
+ EXPECT_TRUE(EvaluateScriptForResultBool("result[0xFFFFFFFF] === 1"));
+ EXPECT_TRUE(EvaluateScriptForResultBool("result[0xFFFFFFFE] === 3"));
+ EXPECT_TRUE(EvaluateScriptForResultBool("result[1] === 0"));
+ });
+ // This detects a fairly subtle case: the object itself must be in the map
+ // before its properties are deserialized, so that references to it can be
+ // resolved.
+ RoundTripTest(
+ "(() => { var y = {}; y.self = y; return y; })()",
+ [this](Local<Value> value) {
+ ASSERT_TRUE(value->IsObject());
+ EXPECT_TRUE(EvaluateScriptForResultBool("result === result.self"));
+ });
+}
+
+TEST_F(ValueSerializerTest, DecodeDictionaryObject) {
+ // Empty object.
+ DecodeTest({0xff, 0x09, 0x3f, 0x00, 0x6f, 0x7b, 0x00, 0x00},
+ [this](Local<Value> value) {
+ ASSERT_TRUE(value->IsObject());
+ EXPECT_TRUE(EvaluateScriptForResultBool(
+ "Object.getPrototypeOf(result) === Object.prototype"));
+ EXPECT_TRUE(EvaluateScriptForResultBool(
+ "Object.getOwnPropertyNames(result).length === 0"));
+ });
+ // String key.
+ DecodeTest(
+ {0xff, 0x09, 0x3f, 0x00, 0x6f, 0x3f, 0x01, 0x53, 0x01, 0x61, 0x3f, 0x01,
+ 0x49, 0x54, 0x7b, 0x01},
+ [this](Local<Value> value) {
+ ASSERT_TRUE(value->IsObject());
+ EXPECT_TRUE(EvaluateScriptForResultBool("result.hasOwnProperty('a')"));
+ EXPECT_TRUE(EvaluateScriptForResultBool("result.a === 42"));
+ EXPECT_TRUE(EvaluateScriptForResultBool(
+ "Object.getOwnPropertyNames(result).length === 1"));
+ });
+ // Integer key (treated as a string, but may be encoded differently).
+ DecodeTest(
+ {0xff, 0x09, 0x3f, 0x00, 0x6f, 0x3f, 0x01, 0x49, 0x54, 0x3f, 0x01, 0x53,
+ 0x01, 0x61, 0x7b, 0x01},
+ [this](Local<Value> value) {
+ ASSERT_TRUE(value->IsObject());
+ EXPECT_TRUE(EvaluateScriptForResultBool("result.hasOwnProperty('42')"));
+ EXPECT_TRUE(EvaluateScriptForResultBool("result[42] === 'a'"));
+ EXPECT_TRUE(EvaluateScriptForResultBool(
+ "Object.getOwnPropertyNames(result).length === 1"));
+ });
+ // Key order must be preserved.
+ DecodeTest(
+ {0xff, 0x09, 0x3f, 0x00, 0x6f, 0x3f, 0x01, 0x53, 0x01, 0x78, 0x3f, 0x01,
+ 0x49, 0x02, 0x3f, 0x01, 0x53, 0x01, 0x79, 0x3f, 0x01, 0x49, 0x04, 0x3f,
+ 0x01, 0x53, 0x01, 0x61, 0x3f, 0x01, 0x49, 0x06, 0x7b, 0x03},
+ [this](Local<Value> value) {
+ EXPECT_TRUE(EvaluateScriptForResultBool(
+ "Object.getOwnPropertyNames(result).toString() === 'x,y,a'"));
+ });
+ // A harder case of enumeration order.
+ DecodeTest(
+ {0xff, 0x09, 0x3f, 0x00, 0x6f, 0x3f, 0x01, 0x49, 0x02, 0x3f, 0x01,
+ 0x49, 0x00, 0x3f, 0x01, 0x55, 0xfe, 0xff, 0xff, 0xff, 0x0f, 0x3f,
+ 0x01, 0x49, 0x06, 0x3f, 0x01, 0x53, 0x01, 0x61, 0x3f, 0x01, 0x49,
+ 0x04, 0x3f, 0x01, 0x53, 0x0a, 0x34, 0x32, 0x39, 0x34, 0x39, 0x36,
+ 0x37, 0x32, 0x39, 0x35, 0x3f, 0x01, 0x49, 0x02, 0x7b, 0x04},
+ [this](Local<Value> value) {
+ EXPECT_TRUE(EvaluateScriptForResultBool(
+ "Object.getOwnPropertyNames(result).toString() === "
+ "'1,4294967294,a,4294967295'"));
+ EXPECT_TRUE(EvaluateScriptForResultBool("result.a === 2"));
+ EXPECT_TRUE(EvaluateScriptForResultBool("result[0xFFFFFFFF] === 1"));
+ EXPECT_TRUE(EvaluateScriptForResultBool("result[0xFFFFFFFE] === 3"));
+ EXPECT_TRUE(EvaluateScriptForResultBool("result[1] === 0"));
+ });
+ // This detects a fairly subtle case: the object itself must be in the map
+ // before its properties are deserialized, so that references to it can be
+ // resolved.
+ DecodeTest(
+ {0xff, 0x09, 0x3f, 0x00, 0x6f, 0x3f, 0x01, 0x53, 0x04, 0x73,
+ 0x65, 0x6c, 0x66, 0x3f, 0x01, 0x5e, 0x00, 0x7b, 0x01, 0x00},
+ [this](Local<Value> value) {
+ ASSERT_TRUE(value->IsObject());
+ EXPECT_TRUE(EvaluateScriptForResultBool("result === result.self"));
+ });
+}
+
+TEST_F(ValueSerializerTest, RoundTripOnlyOwnEnumerableStringKeys) {
+ // Only "own" properties should be serialized, not ones on the prototype.
+ RoundTripTest("(() => { var x = {}; x.__proto__ = {a: 4}; return x; })()",
+ [this](Local<Value> value) {
+ EXPECT_TRUE(EvaluateScriptForResultBool("!('a' in result)"));
+ });
+ // Only enumerable properties should be serialized.
+ RoundTripTest(
+ "(() => {"
+ " var x = {};"
+ " Object.defineProperty(x, 'a', {value: 1, enumerable: false});"
+ " return x;"
+ "})()",
+ [this](Local<Value> value) {
+ EXPECT_TRUE(EvaluateScriptForResultBool("!('a' in result)"));
+ });
+ // Symbol keys should not be serialized.
+ RoundTripTest("({ [Symbol()]: 4 })", [this](Local<Value> value) {
+ EXPECT_TRUE(EvaluateScriptForResultBool(
+ "Object.getOwnPropertySymbols(result).length === 0"));
+ });
+}
+
+TEST_F(ValueSerializerTest, RoundTripTrickyGetters) {
+ // Keys are enumerated before any setters are called, but if there is no own
+ // property when the value is to be read, then it should not be serialized.
+ RoundTripTest("({ get a() { delete this.b; return 1; }, b: 2 })",
+ [this](Local<Value> value) {
+ EXPECT_TRUE(EvaluateScriptForResultBool("!('b' in result)"));
+ });
+ // Keys added after the property enumeration should not be serialized.
+ RoundTripTest("({ get a() { this.b = 3; }})", [this](Local<Value> value) {
+ EXPECT_TRUE(EvaluateScriptForResultBool("!('b' in result)"));
+ });
+ // But if you remove a key and add it back, that's fine. But it will appear in
+ // the original place in enumeration order.
+ RoundTripTest(
+ "({ get a() { delete this.b; this.b = 4; }, b: 2, c: 3 })",
+ [this](Local<Value> value) {
+ EXPECT_TRUE(EvaluateScriptForResultBool(
+ "Object.getOwnPropertyNames(result).toString() === 'a,b,c'"));
+ EXPECT_TRUE(EvaluateScriptForResultBool("result.b === 4"));
+ });
+ // Similarly, it only matters if a property was enumerable when the
+ // enumeration happened.
+ RoundTripTest(
+ "({ get a() {"
+ " Object.defineProperty(this, 'b', {value: 2, enumerable: false});"
+ "}, b: 1})",
+ [this](Local<Value> value) {
+ EXPECT_TRUE(EvaluateScriptForResultBool("result.b === 2"));
+ });
+ RoundTripTest(
+ "(() => {"
+ " var x = {"
+ " get a() {"
+ " Object.defineProperty(this, 'b', {value: 2, enumerable: true});"
+ " }"
+ " };"
+ " Object.defineProperty(x, 'b',"
+ " {value: 1, enumerable: false, configurable: true});"
+ " return x;"
+ "})()",
+ [this](Local<Value> value) {
+ EXPECT_TRUE(EvaluateScriptForResultBool("!('b' in result)"));
+ });
+ // The property also should not be read if it can only be found on the
+ // prototype chain (but not as an own property) after enumeration.
+ RoundTripTest(
+ "(() => {"
+ " var x = { get a() { delete this.b; }, b: 1 };"
+ " x.__proto__ = { b: 0 };"
+ " return x;"
+ "})()",
+ [this](Local<Value> value) {
+ EXPECT_TRUE(EvaluateScriptForResultBool("!('b' in result)"));
+ });
+ // If an exception is thrown by script, encoding must fail and the exception
+ // must be thrown.
+ InvalidEncodeTest("({ get a() { throw new Error('sentinel'); } })",
+ [](Local<Message> message) {
+ ASSERT_FALSE(message.IsEmpty());
+ EXPECT_NE(std::string::npos,
+ Utf8Value(message->Get()).find("sentinel"));
+ });
+}
+
} // namespace
} // namespace v8
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