Title: [232936] trunk/Source/_javascript_Core
Revision
232936
Author
commit-qu...@webkit.org
Date
2018-06-18 11:49:01 -0700 (Mon, 18 Jun 2018)

Log Message

Share structure across instances of classes exported through the ObjC API
https://bugs.webkit.org/show_bug.cgi?id=186579
<rdar://problem/40969212>

Patch by Tadeu Zagallo <tzaga...@apple.com> on 2018-06-18
Reviewed by Saam Barati.

A new structure was being created for each instance of exported ObjC
classes due to setting the prototype in the structure for every object,
since prototype transitions are not cached by the structure. Cache the
Structure in the JSObjcClassInfo to avoid the transition.

* API/JSWrapperMap.mm:
(-[JSObjCClassInfo wrapperForObject:inContext:]):
(-[JSObjCClassInfo structureInContext:]):
* API/tests/JSWrapperMapTests.h: Added.
* API/tests/JSWrapperMapTests.mm: Added.
(+[JSWrapperMapTests testStructureIdentity]):
(runJSWrapperMapTests):
* API/tests/testapi.mm:
(testObjectiveCAPIMain):
* _javascript_Core.xcodeproj/project.pbxproj:

Modified Paths

Added Paths

Diff

Modified: trunk/Source/_javascript_Core/API/JSWrapperMap.mm (232935 => 232936)


--- trunk/Source/_javascript_Core/API/JSWrapperMap.mm	2018-06-18 18:31:06 UTC (rev 232935)
+++ trunk/Source/_javascript_Core/API/JSWrapperMap.mm	2018-06-18 18:49:01 UTC (rev 232936)
@@ -367,6 +367,7 @@
     JSClassRef m_classRef;
     JSC::Weak<JSC::JSObject> m_prototype;
     JSC::Weak<JSC::JSObject> m_constructor;
+    JSC::Weak<JSC::Structure> m_structure;
 }
 
 - (instancetype)initForClass:(Class)cls;
@@ -517,10 +518,14 @@
         }
     }
 
-    JSC::JSObject* prototype = [self prototypeInContext:context];
+    JSC::Structure* structure = [self structureInContext:context];
 
-    JSC::JSObject* wrapper = makeWrapper([context JSGlobalContextRef], m_classRef, object);
-    JSObjectSetPrototype([context JSGlobalContextRef], toRef(wrapper), toRef(prototype));
+    JSC::ExecState* exec = toJS([context JSGlobalContextRef]);
+    JSC::VM& vm = exec->vm();
+    JSC::JSLockHolder locker(vm);
+
+    JSC::JSCallbackObject<JSC::JSAPIWrapperObject>* wrapper = JSC::JSCallbackObject<JSC::JSAPIWrapperObject>::create(exec, exec->lexicalGlobalObject(), structure, m_classRef, 0);
+    wrapper->setWrappedObject(object);
     return wrapper;
 }
 
@@ -542,6 +547,20 @@
     return prototype;
 }
 
+- (JSC::Structure*)structureInContext:(JSContext *)context
+{
+    JSC::Structure* structure = m_structure.get();
+    if (structure)
+        return structure;
+
+    JSC::ExecState* exec = toJS([context JSGlobalContextRef]);
+    JSC::JSGlobalObject* globalObject = toJSGlobalObject([context JSGlobalContextRef]);
+    JSC::JSObject* prototype = [self prototypeInContext:context];
+    m_structure = JSC::JSCallbackObject<JSC::JSAPIWrapperObject>::createStructure(exec->vm(), globalObject, prototype);
+
+    return m_structure.get();
+}
+
 @end
 
 @implementation JSWrapperMap {

Added: trunk/Source/_javascript_Core/API/tests/JSWrapperMapTests.h (0 => 232936)


--- trunk/Source/_javascript_Core/API/tests/JSWrapperMapTests.h	                        (rev 0)
+++ trunk/Source/_javascript_Core/API/tests/JSWrapperMapTests.h	2018-06-18 18:49:01 UTC (rev 232936)
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2018 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import <Foundation/Foundation.h>
+#import <_javascript_Core/_javascript_Core.h>
+
+#if JSC_OBJC_API_ENABLED
+
+void runJSWrapperMapTests();
+
+#endif // JSC_OBJC_API_ENABLED
+

Added: trunk/Source/_javascript_Core/API/tests/JSWrapperMapTests.mm (0 => 232936)


--- trunk/Source/_javascript_Core/API/tests/JSWrapperMapTests.mm	                        (rev 0)
+++ trunk/Source/_javascript_Core/API/tests/JSWrapperMapTests.mm	2018-06-18 18:49:01 UTC (rev 232936)
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2018 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import "config.h"
+#import "JSWrapperMapTests.h"
+
+#import "APICast.h"
+#import "HeapCellInlines.h"
+#import "JSValue.h"
+
+#if JSC_OBJC_API_ENABLED
+
+extern "C" void checkResult(NSString *description, bool passed);
+
+@protocol TestClassJSExport <JSExport>
+- (instancetype)init;
+@end
+
+@interface TestClass : NSObject <TestClassJSExport>
+@end
+
+@implementation TestClass
+@end
+
+
+@interface JSWrapperMapTests : NSObject
++ (void)testStructureIdentity;
+@end
+
+
+@implementation JSWrapperMapTests
++ (void)testStructureIdentity
+{
+    JSContext* context = [[JSContext alloc] init];
+    JSGlobalContextRef contextRef = JSGlobalContextRetain(context.JSGlobalContextRef);
+    JSC::ExecState* exec = toJS(contextRef);
+
+    context[@"TestClass"] = [TestClass class];
+    JSValue* aWrapper = [context evaluateScript:@"new TestClass()"];
+    JSValue* bWrapper = [context evaluateScript:@"new TestClass()"];
+    JSC::JSValue aValue = toJS(exec, aWrapper.JSValueRef);
+    JSC::JSValue bValue = toJS(exec, bWrapper.JSValueRef);
+    JSC::Structure* aStructure = aValue.structureOrNull();
+    JSC::Structure* bStructure = bValue.structureOrNull();
+    checkResult(@"structure should not be null", !!aStructure);
+    checkResult(@"both wrappers should share the same structure", aStructure == bStructure);
+}
+@end
+
+void runJSWrapperMapTests()
+{
+    @autoreleasepool {
+        [JSWrapperMapTests testStructureIdentity];
+    }
+}
+
+#endif // JSC_OBJC_API_ENABLED

Modified: trunk/Source/_javascript_Core/API/tests/testapi.mm (232935 => 232936)


--- trunk/Source/_javascript_Core/API/tests/testapi.mm	2018-06-18 18:31:06 UTC (rev 232935)
+++ trunk/Source/_javascript_Core/API/tests/testapi.mm	2018-06-18 18:49:01 UTC (rev 232936)
@@ -29,6 +29,7 @@
 #import "DateTests.h"
 #import "JSExportTests.h"
 #import "JSVirtualMachinePrivate.h"
+#import "JSWrapperMapTests.h"
 #import "Regress141275.h"
 #import "Regress141809.h"
 
@@ -1475,6 +1476,7 @@
     currentThisInsideBlockGetterTest();
     runDateTests();
     runJSExportTests();
+    runJSWrapperMapTests();
     runRegress141275();
     runRegress141809();
 }

Modified: trunk/Source/_javascript_Core/ChangeLog (232935 => 232936)


--- trunk/Source/_javascript_Core/ChangeLog	2018-06-18 18:31:06 UTC (rev 232935)
+++ trunk/Source/_javascript_Core/ChangeLog	2018-06-18 18:49:01 UTC (rev 232936)
@@ -1,3 +1,27 @@
+2018-06-18  Tadeu Zagallo  <tzaga...@apple.com>
+
+        Share structure across instances of classes exported through the ObjC API
+        https://bugs.webkit.org/show_bug.cgi?id=186579
+        <rdar://problem/40969212>
+
+        Reviewed by Saam Barati.
+
+        A new structure was being created for each instance of exported ObjC
+        classes due to setting the prototype in the structure for every object,
+        since prototype transitions are not cached by the structure. Cache the
+        Structure in the JSObjcClassInfo to avoid the transition.
+
+        * API/JSWrapperMap.mm:
+        (-[JSObjCClassInfo wrapperForObject:inContext:]):
+        (-[JSObjCClassInfo structureInContext:]):
+        * API/tests/JSWrapperMapTests.h: Added.
+        * API/tests/JSWrapperMapTests.mm: Added.
+        (+[JSWrapperMapTests testStructureIdentity]):
+        (runJSWrapperMapTests):
+        * API/tests/testapi.mm:
+        (testObjectiveCAPIMain):
+        * _javascript_Core.xcodeproj/project.pbxproj:
+
 2018-06-18  Michael Saboff  <msab...@apple.com>
 
         Support Unicode 11 in RegExp

Modified: trunk/Source/_javascript_Core/_javascript_Core.xcodeproj/project.pbxproj (232935 => 232936)


--- trunk/Source/_javascript_Core/_javascript_Core.xcodeproj/project.pbxproj	2018-06-18 18:31:06 UTC (rev 232935)
+++ trunk/Source/_javascript_Core/_javascript_Core.xcodeproj/project.pbxproj	2018-06-18 18:49:01 UTC (rev 232936)
@@ -762,6 +762,7 @@
 		1442566215EDE98D0066A49B /* JSWithScope.h in Headers */ = {isa = PBXBuildFile; fileRef = 1442566015EDE98D0066A49B /* JSWithScope.h */; settings = {ATTRIBUTES = (Private, ); }; };
 		144836E7132DA7BE005BE785 /* ConservativeRoots.h in Headers */ = {isa = PBXBuildFile; fileRef = 149DAAF212EB559D0083B12B /* ConservativeRoots.h */; settings = {ATTRIBUTES = (Private, ); }; };
 		145722861437E140005FDE26 /* StrongInlines.h in Headers */ = {isa = PBXBuildFile; fileRef = 145722851437E140005FDE26 /* StrongInlines.h */; settings = {ATTRIBUTES = (Private, ); }; };
+		1471483020D323D30090E630 /* JSWrapperMapTests.mm in Sources */ = {isa = PBXBuildFile; fileRef = 1471482F20D323650090E630 /* JSWrapperMapTests.mm */; };
 		147341CC1DC02D7200AA29BA /* ExecutableBase.h in Headers */ = {isa = PBXBuildFile; fileRef = 147341CB1DC02D7200AA29BA /* ExecutableBase.h */; settings = {ATTRIBUTES = (Private, ); }; };
 		147341CE1DC02D7900AA29BA /* ScriptExecutable.h in Headers */ = {isa = PBXBuildFile; fileRef = 147341CD1DC02D7900AA29BA /* ScriptExecutable.h */; settings = {ATTRIBUTES = (Private, ); }; };
 		147341D01DC02DB400AA29BA /* NativeExecutable.h in Headers */ = {isa = PBXBuildFile; fileRef = 147341CF1DC02DB400AA29BA /* NativeExecutable.h */; settings = {ATTRIBUTES = (Private, ); }; };
@@ -3083,6 +3084,8 @@
 		146B14DB12EB5B12001BEC1B /* ConservativeRoots.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = ConservativeRoots.cpp; sourceTree = "<group>"; };
 		146FA5A81378F6B0003627A3 /* HandleTypes.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = HandleTypes.h; sourceTree = "<group>"; };
 		146FE51111A710430087AE66 /* JITCall32_64.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = JITCall32_64.cpp; sourceTree = "<group>"; };
+		1471482E20D323640090E630 /* JSWrapperMapTests.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = JSWrapperMapTests.h; path = API/tests/JSWrapperMapTests.h; sourceTree = "<group>"; };
+		1471482F20D323650090E630 /* JSWrapperMapTests.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; name = JSWrapperMapTests.mm; path = API/tests/JSWrapperMapTests.mm; sourceTree = "<group>"; };
 		147341CB1DC02D7200AA29BA /* ExecutableBase.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ExecutableBase.h; sourceTree = "<group>"; };
 		147341CD1DC02D7900AA29BA /* ScriptExecutable.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ScriptExecutable.h; sourceTree = "<group>"; };
 		147341CF1DC02DB400AA29BA /* NativeExecutable.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = NativeExecutable.h; sourceTree = "<group>"; };
@@ -5432,6 +5435,8 @@
 				0FF47C591EBFE83500F280B7 /* JSObjectGetProxyTargetTest.h */,
 				5C4E8E941DBEBDA20036F1FC /* JSONParseTest.cpp */,
 				5C4E8E951DBEBDA20036F1FC /* JSONParseTest.h */,
+				1471482E20D323640090E630 /* JSWrapperMapTests.h */,
+				1471482F20D323650090E630 /* JSWrapperMapTests.mm */,
 				144005170A531CB50005F061 /* minidom */,
 				FEF49AA91EB947FE00653BDB /* MultithreadedMultiVMExecutionTest.cpp */,
 				FEF49AAA1EB947FE00653BDB /* MultithreadedMultiVMExecutionTest.h */,
@@ -10154,6 +10159,7 @@
 				C2181FC218A948FB0025A235 /* JSExportTests.mm in Sources */,
 				0FF47C5A1EBFE84600F280B7 /* JSObjectGetProxyTargetTest.cpp in Sources */,
 				5C4E8E961DBEBE620036F1FC /* JSONParseTest.cpp in Sources */,
+				1471483020D323D30090E630 /* JSWrapperMapTests.mm in Sources */,
 				FEF49AAB1EB9484B00653BDB /* MultithreadedMultiVMExecutionTest.cpp in Sources */,
 				FE7C41961B97FC4B00F4D598 /* PingPongStackOverflowTest.cpp in Sources */,
 				65570F5A1AA4C3EA009B3C23 /* Regress141275.mm in Sources */,
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