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<title>[208028] trunk/Source/WebCore</title>
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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/208028">208028</a></dd>
<dt>Author</dt> <dd>utatane.tea@gmail.com</dd>
<dt>Date</dt> <dd>2016-10-27 20:56:50 -0700 (Thu, 27 Oct 2016)</dd>
</dl>
<h3>Log Message</h3>
<pre>[DOM] Add JSEventType
https://bugs.webkit.org/show_bug.cgi?id=164096
Reviewed by Darin Adler.
Event is inherited by many Event classes. But, Event's accessors and interfaces are
frequently called. For example, event.{type, target, srcElement} for accessors. And
event.stopPropagation() and event.preventDefault() functions.
However, since the user-visible event instance is typically the instance of the subclass,
jsDynamicCast<JSEvent*>() walks several classes before it succeeds. It is costly.
In this patch, we add a new WebCore JSType JSEventType for JSEvent and add a new
function jsEventCast. That supports a super fast cast operation. And it paves the way
for implementing DOM accessors of Event in DOMJIT.
No behavior change.
* WebCore.xcodeproj/project.pbxproj:
* bindings/js/JSDOMWrapper.h:
* bindings/js/JSEventCustom.h: Added.
(WebCore::jsEventCast):
* bindings/scripts/CodeGeneratorJS.pm:
(GetJSTypeForNode):
(GenerateHeader):
(GetCastingHelperForThisObject):
* bindings/scripts/test/JS/JSTestEventConstructor.h:
(WebCore::JSTestEventConstructor::createStructure):
* dom/Event.idl:
* domjit/DOMJITHelpers.h:
(WebCore::DOMJIT::branchIfEvent):
(WebCore::DOMJIT::branchIfNotEvent):</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCoreWebCorexcodeprojprojectpbxproj">trunk/Source/WebCore/WebCore.xcodeproj/project.pbxproj</a></li>
<li><a href="#trunkSourceWebCorebindingsjsJSDOMWrapperh">trunk/Source/WebCore/bindings/js/JSDOMWrapper.h</a></li>
<li><a href="#trunkSourceWebCorebindingsscriptsCodeGeneratorJSpm">trunk/Source/WebCore/bindings/scripts/CodeGeneratorJS.pm</a></li>
<li><a href="#trunkSourceWebCorebindingsscriptstestJSJSTestEventConstructorh">trunk/Source/WebCore/bindings/scripts/test/JS/JSTestEventConstructor.h</a></li>
<li><a href="#trunkSourceWebCoredomEventidl">trunk/Source/WebCore/dom/Event.idl</a></li>
<li><a href="#trunkSourceWebCoredomjitDOMJITHelpersh">trunk/Source/WebCore/domjit/DOMJITHelpers.h</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#trunkSourceWebCorebindingsjsJSEventCustomh">trunk/Source/WebCore/bindings/js/JSEventCustom.h</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (208027 => 208028)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog 2016-10-28 03:55:54 UTC (rev 208027)
+++ trunk/Source/WebCore/ChangeLog 2016-10-28 03:56:50 UTC (rev 208028)
</span><span class="lines">@@ -1,3 +1,38 @@
</span><ins>+2016-10-27 Yusuke Suzuki <utatane.tea@gmail.com>
+
+ [DOM] Add JSEventType
+ https://bugs.webkit.org/show_bug.cgi?id=164096
+
+ Reviewed by Darin Adler.
+
+ Event is inherited by many Event classes. But, Event's accessors and interfaces are
+ frequently called. For example, event.{type, target, srcElement} for accessors. And
+ event.stopPropagation() and event.preventDefault() functions.
+
+ However, since the user-visible event instance is typically the instance of the subclass,
+ jsDynamicCast<JSEvent*>() walks several classes before it succeeds. It is costly.
+
+ In this patch, we add a new WebCore JSType JSEventType for JSEvent and add a new
+ function jsEventCast. That supports a super fast cast operation. And it paves the way
+ for implementing DOM accessors of Event in DOMJIT.
+
+ No behavior change.
+
+ * WebCore.xcodeproj/project.pbxproj:
+ * bindings/js/JSDOMWrapper.h:
+ * bindings/js/JSEventCustom.h: Added.
+ (WebCore::jsEventCast):
+ * bindings/scripts/CodeGeneratorJS.pm:
+ (GetJSTypeForNode):
+ (GenerateHeader):
+ (GetCastingHelperForThisObject):
+ * bindings/scripts/test/JS/JSTestEventConstructor.h:
+ (WebCore::JSTestEventConstructor::createStructure):
+ * dom/Event.idl:
+ * domjit/DOMJITHelpers.h:
+ (WebCore::DOMJIT::branchIfEvent):
+ (WebCore::DOMJIT::branchIfNotEvent):
+
</ins><span class="cx"> 2016-10-27 Simon Fraser <simon.fraser@apple.com>
</span><span class="cx">
</span><span class="cx"> Rename StyleRareNonInheritedData::opacity to m_opacity
</span></span></pre></div>
<a id="trunkSourceWebCoreWebCorexcodeprojprojectpbxproj"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/WebCore.xcodeproj/project.pbxproj (208027 => 208028)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/WebCore.xcodeproj/project.pbxproj 2016-10-28 03:55:54 UTC (rev 208027)
+++ trunk/Source/WebCore/WebCore.xcodeproj/project.pbxproj 2016-10-28 03:56:50 UTC (rev 208028)
</span><span class="lines">@@ -6201,6 +6201,7 @@
</span><span class="cx"> E1FF8F6D180DB5BE00132674 /* CryptoAlgorithmRegistry.h in Headers */ = {isa = PBXBuildFile; fileRef = E1FF8F6B180DB5BE00132674 /* CryptoAlgorithmRegistry.h */; };
</span><span class="cx"> E3150EA61DA7219000194012 /* JSNodeDOMJIT.cpp in Sources */ = {isa = PBXBuildFile; fileRef = E3AFA9641DA6E908002861BD /* JSNodeDOMJIT.cpp */; };
</span><span class="cx"> E3150EA71DA7219300194012 /* DOMJITHelpers.h in Headers */ = {isa = PBXBuildFile; fileRef = E3150EA51DA7218D00194012 /* DOMJITHelpers.h */; };
</span><ins>+ E3565B7B1DC2D6C900217DBD /* JSEventCustom.h in Headers */ = {isa = PBXBuildFile; fileRef = E34EE49F1DC2D57500EAA9D3 /* JSEventCustom.h */; settings = {ATTRIBUTES = (Private, ); }; };
</ins><span class="cx"> E35CA14D1DBC3A3F00F83516 /* DOMJITAbstractHeapRepository.cpp in Sources */ = {isa = PBXBuildFile; fileRef = E35CA14B1DBC3A3C00F83516 /* DOMJITAbstractHeapRepository.cpp */; };
</span><span class="cx"> E35CA14E1DBC3A4200F83516 /* DOMJITAbstractHeapRepository.h in Headers */ = {isa = PBXBuildFile; fileRef = E35CA14C1DBC3A3C00F83516 /* DOMJITAbstractHeapRepository.h */; };
</span><span class="cx"> E377FE4D1DADE16500CDD025 /* NodeConstants.h in Headers */ = {isa = PBXBuildFile; fileRef = E3D049931DADC04500718F3C /* NodeConstants.h */; settings = {ATTRIBUTES = (Private, ); }; };
</span><span class="lines">@@ -14031,6 +14032,7 @@
</span><span class="cx"> E1FF8F6A180DB5BE00132674 /* CryptoAlgorithmRegistry.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = CryptoAlgorithmRegistry.cpp; sourceTree = "<group>"; };
</span><span class="cx"> E1FF8F6B180DB5BE00132674 /* CryptoAlgorithmRegistry.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = CryptoAlgorithmRegistry.h; sourceTree = "<group>"; };
</span><span class="cx"> E3150EA51DA7218D00194012 /* DOMJITHelpers.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = DOMJITHelpers.h; sourceTree = "<group>"; };
</span><ins>+ E34EE49F1DC2D57500EAA9D3 /* JSEventCustom.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = JSEventCustom.h; sourceTree = "<group>"; };
</ins><span class="cx"> E35CA14B1DBC3A3C00F83516 /* DOMJITAbstractHeapRepository.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = DOMJITAbstractHeapRepository.cpp; sourceTree = "<group>"; };
</span><span class="cx"> E35CA14C1DBC3A3C00F83516 /* DOMJITAbstractHeapRepository.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = DOMJITAbstractHeapRepository.h; sourceTree = "<group>"; };
</span><span class="cx"> E38838941BAD145F00D62EE3 /* ScriptModuleLoader.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = ScriptModuleLoader.cpp; sourceTree = "<group>"; };
</span><span class="lines">@@ -21609,6 +21611,7 @@
</span><span class="cx"> 65E0E9431133C89F00B4CB10 /* JSDOMWrapper.h */,
</span><span class="cx"> F3D461461161D53200CA0D09 /* JSErrorHandler.cpp */,
</span><span class="cx"> F3D461471161D53200CA0D09 /* JSErrorHandler.h */,
</span><ins>+ E34EE49F1DC2D57500EAA9D3 /* JSEventCustom.h */,
</ins><span class="cx"> BC60901E0E91B8EC000C68B5 /* JSEventTargetCustom.cpp */,
</span><span class="cx"> 46B63F6B1C6E8CDF002E914B /* JSEventTargetCustom.h */,
</span><span class="cx"> 3314ACE910892086000F0E56 /* JSExceptionBase.cpp */,
</span><span class="lines">@@ -25506,6 +25509,7 @@
</span><span class="cx"> B885E8D511E06DD2009FFBF4 /* InspectorApplicationCacheAgent.h in Headers */,
</span><span class="cx"> 1C81B95C0E97330800266E07 /* InspectorClient.h in Headers */,
</span><span class="cx"> 1C81B95A0E97330800266E07 /* InspectorController.h in Headers */,
</span><ins>+ E3565B7B1DC2D6C900217DBD /* JSEventCustom.h in Headers */,
</ins><span class="cx"> 82AB1744124B99EC00C5069D /* InspectorCSSAgent.h in Headers */,
</span><span class="cx"> 4A9CC82116BF9BB400EC645A /* InspectorCSSOMWrappers.h in Headers */,
</span><span class="cx"> 7AB0B1C11211A62200A76940 /* InspectorDatabaseAgent.h in Headers */,
</span></span></pre></div>
<a id="trunkSourceWebCorebindingsjsJSDOMWrapperh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/bindings/js/JSDOMWrapper.h (208027 => 208028)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/bindings/js/JSDOMWrapper.h 2016-10-28 03:55:54 UTC (rev 208027)
+++ trunk/Source/WebCore/bindings/js/JSDOMWrapper.h 2016-10-28 03:56:50 UTC (rev 208028)
</span><span class="lines">@@ -30,13 +30,18 @@
</span><span class="cx"> class JSDOMWindow;
</span><span class="cx"> class ScriptExecutionContext;
</span><span class="cx">
</span><del>-// We encode Node type into JSType. The format is the following.
-// offset | 7 | 6 5 4 | 3 2 1 0 |
-// value | 1 | Kind | NodeType |
</del><ins>+// JSC allows us to extend JSType. If the highest bit is set, we can add any Object types and they are
+// recognized as OtherObj in JSC. And we encode Node type into JSType if the given JSType is subclass of Node.
+// offset | 7 | 6 | 5 4 | 3 2 1 0 |
+// value | 1 | 0 | Non-node DOM types |
+// If the given JSType is a subclass of Node, the format is the following.
+// offset | 7 | 6 | 5 4 | 3 2 1 0 |
+// value | 1 | 1 | Kind | NodeType |
</ins><span class="cx"> static const uint8_t JSNodeTypeMask = 0b00001111;
</span><span class="cx">
</span><span class="cx"> static const uint8_t JSDOMWrapperType = 0b10000000;
</span><del>-static const uint8_t JSNodeType = 0b10010000;
</del><ins>+static const uint8_t JSEventType = 0b10000001;
+static const uint8_t JSNodeType = 0b11000000;
</ins><span class="cx"> static const uint8_t JSTextNodeType = JSNodeType | NodeConstants::TEXT_NODE;
</span><span class="cx"> static const uint8_t JSProcessingInstructionNodeType = JSNodeType | NodeConstants::PROCESSING_INSTRUCTION_NODE;
</span><span class="cx"> static const uint8_t JSDocumentTypeNodeType = JSNodeType | NodeConstants::DOCUMENT_TYPE_NODE;
</span><span class="lines">@@ -45,7 +50,7 @@
</span><span class="cx"> static const uint8_t JSCommentNodeType = JSNodeType | NodeConstants::COMMENT_NODE;
</span><span class="cx"> static const uint8_t JSCDATASectionNodeType = JSNodeType | NodeConstants::CDATA_SECTION_NODE;
</span><span class="cx"> static const uint8_t JSAttrNodeType = JSNodeType | NodeConstants::ATTRIBUTE_NODE;
</span><del>-static const uint8_t JSElementType = 0b10100000 | NodeConstants::ELEMENT_NODE;
</del><ins>+static const uint8_t JSElementType = 0b11010000 | NodeConstants::ELEMENT_NODE;
</ins><span class="cx">
</span><span class="cx"> static_assert(JSDOMWrapperType > JSC::LastJSCObjectType, "JSC::JSType offers the highest bit.");
</span><span class="cx"> static_assert(NodeConstants::LastNodeType <= JSNodeTypeMask, "NodeType should be represented in 4bit.");
</span></span></pre></div>
<a id="trunkSourceWebCorebindingsjsJSEventCustomh"></a>
<div class="addfile"><h4>Added: trunk/Source/WebCore/bindings/js/JSEventCustom.h (0 => 208028)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/bindings/js/JSEventCustom.h (rev 0)
+++ trunk/Source/WebCore/bindings/js/JSEventCustom.h 2016-10-28 03:56:50 UTC (rev 208028)
</span><span class="lines">@@ -0,0 +1,39 @@
</span><ins>+/*
+ * Copyright (C) 2016 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. ``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
+ * 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.
+ */
+
+#pragma once
+
+#include "JSDOMBinding.h"
+
+namespace WebCore {
+
+ALWAYS_INLINE JSEvent* jsEventCast(JSC::JSValue value)
+{
+ if (UNLIKELY(!value.isCell()))
+ return nullptr;
+ return value.asCell()->type() == JSEventType ? JSC::jsCast<JSEvent*>(value) : nullptr;
+}
+
+} // namespace WebCore
</ins></span></pre></div>
<a id="trunkSourceWebCorebindingsscriptsCodeGeneratorJSpm"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/bindings/scripts/CodeGeneratorJS.pm (208027 => 208028)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/bindings/scripts/CodeGeneratorJS.pm 2016-10-28 03:55:54 UTC (rev 208027)
+++ trunk/Source/WebCore/bindings/scripts/CodeGeneratorJS.pm 2016-10-28 03:56:50 UTC (rev 208028)
</span><span class="lines">@@ -1216,7 +1216,7 @@
</span><span class="cx">
</span><span class="cx"> sub GetJSTypeForNode
</span><span class="cx"> {
</span><del>- my ($codeGenerator, $interface) = @_;
</del><ins>+ my ($interface) = @_;
</ins><span class="cx">
</span><span class="cx"> if ($codeGenerator->InheritsInterface($interface, "Document")) {
</span><span class="cx"> return "JSDocumentWrapperType";
</span><span class="lines">@@ -1446,8 +1446,10 @@
</span><span class="cx"> if (IsDOMGlobalObject($interface)) {
</span><span class="cx"> push(@headerContent, " return JSC::Structure::create(vm, globalObject, prototype, JSC::TypeInfo(JSC::GlobalObjectType, StructureFlags), info());\n");
</span><span class="cx"> } elsif ($codeGenerator->InheritsInterface($interface, "Node")) {
</span><del>- my $type = GetJSTypeForNode($codeGenerator, $interface);
</del><ins>+ my $type = GetJSTypeForNode($interface);
</ins><span class="cx"> push(@headerContent, " return JSC::Structure::create(vm, globalObject, prototype, JSC::TypeInfo(JSC::JSType($type), StructureFlags), info());\n");
</span><ins>+ } elsif ($codeGenerator->InheritsInterface($interface, "Event")) {
+ push(@headerContent, " return JSC::Structure::create(vm, globalObject, prototype, JSC::TypeInfo(JSC::JSType(JSEventType), StructureFlags), info());\n");
</ins><span class="cx"> } else {
</span><span class="cx"> push(@headerContent, " return JSC::Structure::create(vm, globalObject, prototype, JSC::TypeInfo(JSC::ObjectType, StructureFlags), info());\n");
</span><span class="cx"> }
</span><span class="lines">@@ -2488,6 +2490,7 @@
</span><span class="cx"> return "jsElementCast" if $interfaceName eq "Element";
</span><span class="cx"> return "jsDocumentCast" if $interfaceName eq "Document";
</span><span class="cx"> return "jsEventTargetCast" if $interfaceName eq "EventTarget";
</span><ins>+ return "jsEventCast" if $interfaceName eq "Event";
</ins><span class="cx"> return "jsDynamicCast<JS$interfaceName*>";
</span><span class="cx"> }
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourceWebCorebindingsscriptstestJSJSTestEventConstructorh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/bindings/scripts/test/JS/JSTestEventConstructor.h (208027 => 208028)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/bindings/scripts/test/JS/JSTestEventConstructor.h 2016-10-28 03:55:54 UTC (rev 208027)
+++ trunk/Source/WebCore/bindings/scripts/test/JS/JSTestEventConstructor.h 2016-10-28 03:56:50 UTC (rev 208028)
</span><span class="lines">@@ -44,7 +44,7 @@
</span><span class="cx">
</span><span class="cx"> static JSC::Structure* createStructure(JSC::VM& vm, JSC::JSGlobalObject* globalObject, JSC::JSValue prototype)
</span><span class="cx"> {
</span><del>- return JSC::Structure::create(vm, globalObject, prototype, JSC::TypeInfo(JSC::ObjectType, StructureFlags), info());
</del><ins>+ return JSC::Structure::create(vm, globalObject, prototype, JSC::TypeInfo(JSC::JSType(JSEventType), StructureFlags), info());
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> static JSC::JSValue getConstructor(JSC::VM&, const JSC::JSGlobalObject*);
</span></span></pre></div>
<a id="trunkSourceWebCoredomEventidl"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/dom/Event.idl (208027 => 208028)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/dom/Event.idl 2016-10-28 03:55:54 UTC (rev 208027)
+++ trunk/Source/WebCore/dom/Event.idl 2016-10-28 03:56:50 UTC (rev 208028)
</span><span class="lines">@@ -27,6 +27,7 @@
</span><span class="cx"> CustomToJSObject,
</span><span class="cx"> ExportToWrappedFunction,
</span><span class="cx"> Exposed=(Window,Worker),
</span><ins>+ JSCustomHeader,
</ins><span class="cx"> ] interface Event {
</span><span class="cx"> // PhaseType
</span><span class="cx"> const unsigned short NONE = 0;
</span></span></pre></div>
<a id="trunkSourceWebCoredomjitDOMJITHelpersh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/domjit/DOMJITHelpers.h (208027 => 208028)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/domjit/DOMJITHelpers.h 2016-10-28 03:55:54 UTC (rev 208027)
+++ trunk/Source/WebCore/domjit/DOMJITHelpers.h 2016-10-28 03:56:50 UTC (rev 208028)
</span><span class="lines">@@ -98,6 +98,16 @@
</span><span class="cx"> CCallHelpers::TrustedImm32(JSC::JSType(JSDOMWrapperType)));
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+inline CCallHelpers::Jump branchIfEvent(CCallHelpers& jit, GPRReg target)
+{
+ return jit.branchIfType(target, JSC::JSType(JSEventType));
+}
+
+inline CCallHelpers::Jump branchIfNotEvent(CCallHelpers& jit, GPRReg target)
+{
+ return jit.branchIfNotType(target, JSC::JSType(JSEventType));
+}
+
</ins><span class="cx"> inline CCallHelpers::Jump branchIfNode(CCallHelpers& jit, GPRReg target)
</span><span class="cx"> {
</span><span class="cx"> return jit.branch8(
</span></span></pre>
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