Attachment 371047 Details for Bug 195771 – patch

[patch] patch

b-backup.diff (text/plain), 40.42 KB, created by Saam Barati on 2019-05-31 02:34:39 PDT

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Creator: Saam Barati

Created: 2019-05-31 02:34:39 PDT

Size: 40.42 KB

patch

obsolete

>Index: Source/WebCore/ChangeLog
>===================================================================
>--- Source/WebCore/ChangeLog	(revision 245957)
>+++ Source/WebCore/ChangeLog	(working copy)
>@@ -1,3 +1,57 @@
>+2019-05-31  Saam Barati  <sbarati@apple.com>
>+
>+        [WHLSL] Implement zero-filling of types
>+        https://bugs.webkit.org/show_bug.cgi?id=195771
>+        <rdar://problem/50746291>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        This patch implements zero-filling in two parts:
>+        1. We add a new pass, autoInitializeVariables, which makes any variable declaration
>+        without an initializer call the default constructor for the variable's type.
>+        Since we auto generate the default constructor, it's a native function whose
>+        implementation we control.
>+        
>+        2. Each native constructor is implemented as a memset(&value, sizeof(value), 0).
>+        This memset is an inlined loop in each constructor. The reason this turns
>+        everything into zero is that for every primitive type, the "zero" value is
>+        represented as all zeroes in memory: float, int, pointers, etc.
>+        
>+        Since our ability to test some of this is limited, I opened a follow-up bug to
>+        test this more:
>+        https://bugs.webkit.org/show_bug.cgi?id=198413
>+
>+        Tests: webgpu/whlsl-zero-initialize-values-2.html
>+               webgpu/whlsl-zero-initialize-values.html
>+
>+        * Modules/webgpu/WHLSL/AST/WHLSLVariableDeclaration.h:
>+        (WebCore::WHLSL::AST::VariableDeclaration::setInitializer):
>+        * Modules/webgpu/WHLSL/Metal/WHLSLFunctionWriter.cpp:
>+        (WebCore::WHLSL::Metal::FunctionDefinitionWriter::visit):
>+        * Modules/webgpu/WHLSL/Metal/WHLSLNativeFunctionWriter.cpp:
>+        (WebCore::WHLSL::Metal::writeNativeFunction):
>+        * Modules/webgpu/WHLSL/WHLSLASTDumper.h:
>+        * Modules/webgpu/WHLSL/WHLSLAutoInitializeVariables.cpp: Added.
>+        (WebCore::WHLSL::AutoInitialize::AutoInitialize):
>+        (WebCore::WHLSL::AutoInitialize::visit):
>+        (WebCore::WHLSL::autoInitializeVariables):
>+        * Modules/webgpu/WHLSL/WHLSLAutoInitializeVariables.h: Added.
>+        * Modules/webgpu/WHLSL/WHLSLChecker.cpp:
>+        (WebCore::WHLSL::checkOperatorOverload):
>+        (WebCore::WHLSL::Checker::visit):
>+        * Modules/webgpu/WHLSL/WHLSLInferTypes.cpp:
>+        (WebCore::WHLSL::inferTypesForCallImpl):
>+        (WebCore::WHLSL::inferTypesForCall):
>+        * Modules/webgpu/WHLSL/WHLSLInferTypes.h:
>+        * Modules/webgpu/WHLSL/WHLSLPrepare.cpp:
>+        (WebCore::WHLSL::prepareShared):
>+        * Modules/webgpu/WHLSL/WHLSLResolveOverloadImpl.cpp:
>+        (WebCore::WHLSL::resolveFunctionOverloadImpl):
>+        (WebCore::WHLSL::resolveFunctionOverload):
>+        * Modules/webgpu/WHLSL/WHLSLResolveOverloadImpl.h:
>+        * Sources.txt:
>+        * WebCore.xcodeproj/project.pbxproj:
>+
> 2019-05-30  Zan Dobersek  <zdobersek@igalia.com>
> 
>         Unreviewed. Suppress -Wunused-variable warnings for the unused static
>Index: Source/WebCore/Sources.txt
>===================================================================
>--- Source/WebCore/Sources.txt	(revision 245951)
>+++ Source/WebCore/Sources.txt	(working copy)
>@@ -307,6 +307,7 @@ Modules/websockets/WorkerThreadableWebSo
> Modules/webgpu/GPUCanvasContext.cpp
> Modules/webgpu/NavigatorGPU.cpp
> Modules/webgpu/WHLSL/WHLSLASTDumper.cpp
>+Modules/webgpu/WHLSL/WHLSLAutoInitializeVariables.cpp
> Modules/webgpu/WHLSL/WHLSLInferTypes.cpp
> Modules/webgpu/WHLSL/WHLSLLexer.cpp
> Modules/webgpu/WHLSL/WHLSLParser.cpp
>Index: Source/WebCore/Modules/webgpu/WHLSL/WHLSLASTDumper.h
>===================================================================
>--- Source/WebCore/Modules/webgpu/WHLSL/WHLSLASTDumper.h	(revision 245951)
>+++ Source/WebCore/Modules/webgpu/WHLSL/WHLSLASTDumper.h	(working copy)
>@@ -142,6 +142,7 @@ MAKE_PRINT_ADAPTOR(StatementDumper, AST:
> MAKE_PRINT_ADAPTOR(ProgramDumper, Program&, dumpASTNode);
> MAKE_PRINT_ADAPTOR(StructureDefinitionDumper, AST::StructureDefinition&, dumpASTNode);
> MAKE_PRINT_ADAPTOR(FunctionDefinitionDumper, AST::FunctionDefinition&, dumpASTNode);
>+MAKE_PRINT_ADAPTOR(TypeDumper, AST::UnnamedType&, dumpASTNode);
> 
> 
> static ALWAYS_INLINE void dumpAST(Program& program)
>Index: Source/WebCore/Modules/webgpu/WHLSL/WHLSLAutoInitializeVariables.cpp
>===================================================================
>--- Source/WebCore/Modules/webgpu/WHLSL/WHLSLAutoInitializeVariables.cpp	(nonexistent)
>+++ Source/WebCore/Modules/webgpu/WHLSL/WHLSLAutoInitializeVariables.cpp	(working copy)
>@@ -0,0 +1,93 @@
>+/*
>+ * Copyright (C) 2019 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.
>+ */
>+
>+#include "config.h"
>+#include "WHLSLAutoInitializeVariables.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLAST.h"
>+#include "WHLSLASTDumper.h"
>+#include "WHLSLNameContext.h"
>+#include "WHLSLResolveOverloadImpl.h"
>+#include "WHLSLResolvingType.h"
>+#include "WHLSLVisitor.h"
>+#include <wtf/StringPrintStream.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+class AutoInitialize : public Visitor {
>+    using Base = Visitor;
>+public:
>+    AutoInitialize(NameContext& nameContext)
>+        : m_nameContext(nameContext)
>+        , m_castFunctions(*m_nameContext.getFunctions("operator cast"_str))
>+    { }
>+
>+private:
>+    void visit(AST::FunctionDeclaration&)
>+    {
>+        // Skip argument declarations.
>+    }
>+
>+    void visit(AST::VariableDeclaration& variableDeclaration)
>+    {
>+        if (variableDeclaration.initializer())
>+            return;
>+
>+        AST::UnnamedType* type = variableDeclaration.type();
>+        RELEASE_ASSERT(type);
>+
>+        StringPrintStream printStream;
>+        printStream.print(TypeDumper(*type));
>+        auto callExpression = makeUniqueRef<AST::CallExpression>(variableDeclaration.origin(), printStream.toString(), Vector<UniqueRef<AST::Expression>>());
>+        callExpression->setType(type->clone());
>+        callExpression->setTypeAnnotation(AST::RightValue());
>+        callExpression->setOverloads(m_castFunctions);
>+        Vector<std::reference_wrapper<ResolvingType>> argumentTypes;
>+        auto* function = resolveFunctionOverload(*callExpression->overloads(), argumentTypes, type);
>+        RELEASE_ASSERT(function);
>+        callExpression->setFunction(*function);
>+
>+        variableDeclaration.setInitializer(WTFMove(callExpression));
>+    }
>+
>+    NameContext& m_nameContext;
>+    Vector<std::reference_wrapper<AST::FunctionDeclaration>, 1>& m_castFunctions;
>+};
>+
>+void autoInitializeVariables(Program& program)
>+{
>+    AutoInitialize autoInitialize(program.nameContext());
>+    autoInitialize.Visitor::visit(program);
>+}
>+
>+} // namespace WHLSL
>+
>+} // namespace WebCore
>+
>+#endif // ENABLE(WEBGPU)
>Index: Source/WebCore/Modules/webgpu/WHLSL/WHLSLAutoInitializeVariables.h
>===================================================================
>--- Source/WebCore/Modules/webgpu/WHLSL/WHLSLAutoInitializeVariables.h	(nonexistent)
>+++ Source/WebCore/Modules/webgpu/WHLSL/WHLSLAutoInitializeVariables.h	(working copy)
>@@ -0,0 +1,42 @@
>+/*
>+ * Copyright (C) 2019 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.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+class Program;
>+
>+void autoInitializeVariables(Program&);
>+
>+}
>+
>+}
>+
>+#endif
>Index: Source/WebCore/Modules/webgpu/WHLSL/WHLSLChecker.cpp
>===================================================================
>--- Source/WebCore/Modules/webgpu/WHLSL/WHLSLChecker.cpp	(revision 245951)
>+++ Source/WebCore/Modules/webgpu/WHLSL/WHLSLChecker.cpp	(working copy)
>@@ -357,7 +357,7 @@ static bool checkOperatorOverload(const 
>             argumentTypes.append((*functionDefinition.parameters()[0]->type())->clone());
>         for (auto& argumentType : argumentTypes)
>             argumentTypeReferences.append(argumentType);
>-        auto* overload = resolveFunctionOverloadImpl(*getterFuncs, argumentTypeReferences, nullptr);
>+        auto* overload = resolveFunctionOverload(*getterFuncs, argumentTypeReferences);
>         if (!overload)
>             return false;
>         auto& resultType = overload->type();
>@@ -979,7 +979,7 @@ void Checker::visit(AST::DotExpression& 
>     AST::UnnamedType* getterReturnType = nullptr;
>     {
>         Vector<std::reference_wrapper<ResolvingType>> getterArgumentTypes { baseInfo->resolvingType };
>-        getterFunction = resolveFunctionOverloadImpl(dotExpression.possibleGetterOverloads(), getterArgumentTypes, nullptr);
>+        getterFunction = resolveFunctionOverload(dotExpression.possibleGetterOverloads(), getterArgumentTypes);
>         if (getterFunction)
>             getterReturnType = &getterFunction->type();
>     }
>@@ -989,7 +989,7 @@ void Checker::visit(AST::DotExpression& 
>     if (auto leftAddressSpace = baseInfo->typeAnnotation.leftAddressSpace()) {
>         auto argumentType = makeUniqueRef<AST::PointerType>(Lexer::Token(dotExpression.origin()), *leftAddressSpace, baseUnnamedType->get().clone());
>         Vector<std::reference_wrapper<ResolvingType>> anderArgumentTypes { baseInfo->resolvingType };
>-        anderFunction = resolveFunctionOverloadImpl(dotExpression.possibleAnderOverloads(), anderArgumentTypes, nullptr);
>+        anderFunction = resolveFunctionOverload(dotExpression.possibleAnderOverloads(), anderArgumentTypes);
>         if (anderFunction)
>             anderReturnType = &downcast<AST::PointerType>(anderFunction->type()).elementType(); // FIXME: https://bugs.webkit.org/show_bug.cgi?id=198164 Enforce the return of anders will always be a pointer
>     }
>@@ -999,7 +999,7 @@ void Checker::visit(AST::DotExpression& 
>     {
>         auto argumentType = makeUniqueRef<AST::PointerType>(Lexer::Token(dotExpression.origin()), AST::AddressSpace::Thread, baseUnnamedType->get().clone());
>         Vector<std::reference_wrapper<ResolvingType>> threadAnderArgumentTypes { baseInfo->resolvingType };
>-        threadAnderFunction = resolveFunctionOverloadImpl(dotExpression.possibleAnderOverloads(), threadAnderArgumentTypes, nullptr);
>+        threadAnderFunction = resolveFunctionOverload(dotExpression.possibleAnderOverloads(), threadAnderArgumentTypes);
>         if (threadAnderFunction)
>             threadAnderReturnType = &downcast<AST::PointerType>(threadAnderFunction->type()).elementType(); // FIXME: https://bugs.webkit.org/show_bug.cgi?id=198164 Enforce the return of anders will always be a pointer
>     }
>@@ -1024,7 +1024,7 @@ void Checker::visit(AST::DotExpression& 
>     {
>         ResolvingType fieldResolvingType(fieldType->clone());
>         Vector<std::reference_wrapper<ResolvingType>> setterArgumentTypes { baseInfo->resolvingType, fieldResolvingType };
>-        setterFunction = resolveFunctionOverloadImpl(dotExpression.possibleSetterOverloads(), setterArgumentTypes, nullptr);
>+        setterFunction = resolveFunctionOverload(dotExpression.possibleSetterOverloads(), setterArgumentTypes);
>         if (setterFunction)
>             setterReturnType = &setterFunction->type();
>     }
>@@ -1397,7 +1397,7 @@ void Checker::visit(AST::CallExpression&
>     // We don't want to recurse to the same node twice.
> 
>     ASSERT(callExpression.hasOverloads());
>-    auto* function = resolveFunctionOverloadImpl(*callExpression.overloads(), types, callExpression.castReturnType());
>+    auto* function = resolveFunctionOverload(*callExpression.overloads(), types, callExpression.castReturnType());
>     if (!function) {
>         if (auto newFunction = resolveByInstantiation(callExpression, types, m_intrinsics)) {
>             m_program.append(WTFMove(*newFunction));
>Index: Source/WebCore/Modules/webgpu/WHLSL/WHLSLInferTypes.cpp
>===================================================================
>--- Source/WebCore/Modules/webgpu/WHLSL/WHLSLInferTypes.cpp	(revision 245951)
>+++ Source/WebCore/Modules/webgpu/WHLSL/WHLSLInferTypes.cpp	(working copy)
>@@ -221,7 +221,8 @@ bool inferTypesForTypeArguments(AST::Nam
>     return true;
> }
> 
>-bool inferTypesForCall(AST::FunctionDeclaration& possibleFunction, Vector<std::reference_wrapper<ResolvingType>>& argumentTypes, const AST::NamedType* castReturnType)
>+template <typename TypeKind>
>+ALWAYS_INLINE bool inferTypesForCallImpl(AST::FunctionDeclaration& possibleFunction, Vector<std::reference_wrapper<ResolvingType>>& argumentTypes, const TypeKind* castReturnType)
> {
>     if (possibleFunction.parameters().size() != argumentTypes.size())
>         return false;
>@@ -239,6 +240,16 @@ bool inferTypesForCall(AST::FunctionDecl
>     return true;
> }
> 
>+bool inferTypesForCall(AST::FunctionDeclaration& possibleFunction, Vector<std::reference_wrapper<ResolvingType>>& argumentTypes, const AST::NamedType* castReturnType)
>+{
>+    return inferTypesForCallImpl(possibleFunction, argumentTypes, castReturnType);
>+}
>+
>+bool inferTypesForCall(AST::FunctionDeclaration& possibleFunction, Vector<std::reference_wrapper<ResolvingType>>& argumentTypes, const AST::UnnamedType* castReturnType)
>+{
>+    return inferTypesForCallImpl(possibleFunction, argumentTypes, castReturnType);
>+}
>+
> } // namespace WHLSL
> 
> } // namespace WebCore
>Index: Source/WebCore/Modules/webgpu/WHLSL/WHLSLInferTypes.h
>===================================================================
>--- Source/WebCore/Modules/webgpu/WHLSL/WHLSLInferTypes.h	(revision 245951)
>+++ Source/WebCore/Modules/webgpu/WHLSL/WHLSLInferTypes.h	(working copy)
>@@ -54,6 +54,7 @@ Optional<UniqueRef<AST::UnnamedType>> ma
> Optional<UniqueRef<AST::UnnamedType>> commit(AST::ResolvableType&);
> bool inferTypesForTypeArguments(AST::NamedType& possibleType, AST::TypeArguments&);
> bool inferTypesForCall(AST::FunctionDeclaration& possibleFunction, Vector<std::reference_wrapper<ResolvingType>>& argumentTypes, const AST::NamedType* castReturnType);
>+bool inferTypesForCall(AST::FunctionDeclaration& possibleFunction, Vector<std::reference_wrapper<ResolvingType>>& argumentTypes, const AST::UnnamedType* castReturnType);
> 
> }
> 
>Index: Source/WebCore/Modules/webgpu/WHLSL/WHLSLPrepare.cpp
>===================================================================
>--- Source/WebCore/Modules/webgpu/WHLSL/WHLSLPrepare.cpp	(revision 245951)
>+++ Source/WebCore/Modules/webgpu/WHLSL/WHLSLPrepare.cpp	(working copy)
>@@ -29,6 +29,7 @@
> #if ENABLE(WEBGPU)
> 
> #include "WHLSLASTDumper.h"
>+#include "WHLSLAutoInitializeVariables.h"
> #include "WHLSLCheckDuplicateFunctions.h"
> #include "WHLSLChecker.h"
> #include "WHLSLFunctionStageChecker.h"
>@@ -57,7 +58,7 @@ namespace WHLSL {
> 
> static constexpr bool dumpASTBeforeEachPass = false;
> static constexpr bool dumpASTAfterParsing = false;
>-static constexpr bool dumpASTAtEnd = true;
>+static constexpr bool dumpASTAtEnd = false;
> static constexpr bool alwaysDumpPassFailures = false;
> static constexpr bool dumpPassFailure = dumpASTBeforeEachPass || dumpASTAfterParsing || dumpASTAtEnd || alwaysDumpPassFailures;
> 
>@@ -124,6 +125,7 @@ static Optional<Program> prepareShared(S
>     RUN_PASS(check, program);
> 
>     checkLiteralTypes(program);
>+    autoInitializeVariables(program);
>     resolveProperties(program);
>     findHighZombies(program);
>     RUN_PASS(checkStatementBehavior, program);
>Index: Source/WebCore/Modules/webgpu/WHLSL/WHLSLResolveOverloadImpl.cpp
>===================================================================
>--- Source/WebCore/Modules/webgpu/WHLSL/WHLSLResolveOverloadImpl.cpp	(revision 245951)
>+++ Source/WebCore/Modules/webgpu/WHLSL/WHLSLResolveOverloadImpl.cpp	(working copy)
>@@ -51,7 +51,8 @@ static unsigned conversionCost(AST::Func
>     return conversionCost;
> }
> 
>-AST::FunctionDeclaration* resolveFunctionOverloadImpl(Vector<std::reference_wrapper<AST::FunctionDeclaration>, 1>& possibleFunctions, Vector<std::reference_wrapper<ResolvingType>>& argumentTypes, AST::NamedType* castReturnType)
>+template <typename TypeKind>
>+AST::FunctionDeclaration* resolveFunctionOverloadImpl(Vector<std::reference_wrapper<AST::FunctionDeclaration>, 1>& possibleFunctions, Vector<std::reference_wrapper<ResolvingType>>& argumentTypes, TypeKind* castReturnType)
> {
>     Vector<std::reference_wrapper<AST::FunctionDeclaration>, 1> candidates;
>     for (auto& possibleFunction : possibleFunctions) {
>@@ -76,6 +77,21 @@ AST::FunctionDeclaration* resolveFunctio
>     return nullptr;
> }
> 
>+AST::FunctionDeclaration* resolveFunctionOverload(Vector<std::reference_wrapper<AST::FunctionDeclaration>, 1>& possibleFunctions, Vector<std::reference_wrapper<ResolvingType>>& argumentTypes)
>+{
>+    return resolveFunctionOverloadImpl(possibleFunctions, argumentTypes, static_cast<AST::NamedType*>(nullptr));
>+}
>+
>+AST::FunctionDeclaration* resolveFunctionOverload(Vector<std::reference_wrapper<AST::FunctionDeclaration>, 1>& possibleFunctions, Vector<std::reference_wrapper<ResolvingType>>& argumentTypes, AST::NamedType* castReturnType)
>+{
>+    return resolveFunctionOverloadImpl(possibleFunctions, argumentTypes, castReturnType);
>+}
>+
>+AST::FunctionDeclaration* resolveFunctionOverload(Vector<std::reference_wrapper<AST::FunctionDeclaration>, 1>& possibleFunctions, Vector<std::reference_wrapper<ResolvingType>>& argumentTypes, AST::UnnamedType* castReturnType)
>+{
>+    return resolveFunctionOverloadImpl(possibleFunctions, argumentTypes, castReturnType);
>+}
>+
> AST::NamedType* resolveTypeOverloadImpl(Vector<std::reference_wrapper<AST::NamedType>, 1>& possibleTypes, AST::TypeArguments& typeArguments)
> {
>     AST::NamedType* result = nullptr;
>Index: Source/WebCore/Modules/webgpu/WHLSL/WHLSLResolveOverloadImpl.h
>===================================================================
>--- Source/WebCore/Modules/webgpu/WHLSL/WHLSLResolveOverloadImpl.h	(revision 245951)
>+++ Source/WebCore/Modules/webgpu/WHLSL/WHLSLResolveOverloadImpl.h	(working copy)
>@@ -43,7 +43,9 @@ class NamedType;
> 
> }
> 
>-AST::FunctionDeclaration* resolveFunctionOverloadImpl(Vector<std::reference_wrapper<AST::FunctionDeclaration>, 1>& possibleFunctions, Vector<std::reference_wrapper<ResolvingType>>& argumentTypes, AST::NamedType* castReturnType);
>+AST::FunctionDeclaration* resolveFunctionOverload(Vector<std::reference_wrapper<AST::FunctionDeclaration>, 1>& possibleFunctions, Vector<std::reference_wrapper<ResolvingType>>& argumentTypes);
>+AST::FunctionDeclaration* resolveFunctionOverload(Vector<std::reference_wrapper<AST::FunctionDeclaration>, 1>& possibleFunctions, Vector<std::reference_wrapper<ResolvingType>>& argumentTypes, AST::NamedType* castReturnType);
>+AST::FunctionDeclaration* resolveFunctionOverload(Vector<std::reference_wrapper<AST::FunctionDeclaration>, 1>& possibleFunctions, Vector<std::reference_wrapper<ResolvingType>>& argumentTypes, AST::UnnamedType* castReturnType);
> AST::NamedType* resolveTypeOverloadImpl(Vector<std::reference_wrapper<AST::NamedType>, 1>&, AST::TypeArguments&);
> 
> }
>Index: Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLVariableDeclaration.h
>===================================================================
>--- Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLVariableDeclaration.h	(revision 245951)
>+++ Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLVariableDeclaration.h	(working copy)
>@@ -70,6 +70,11 @@ public:
>     Expression* initializer() { return m_initializer ? &*m_initializer : nullptr; }
>     bool isAnonymous() const { return m_name.isNull(); }
>     Optional<UniqueRef<Expression>> takeInitializer() { return WTFMove(m_initializer); }
>+    void setInitializer(UniqueRef<Expression> expression)
>+    {
>+        ASSERT(!initializer());
>+        m_initializer = WTFMove(expression);
>+    }
> 
> private:
>     Qualifiers m_qualifiers;
>Index: Source/WebCore/Modules/webgpu/WHLSL/Metal/WHLSLFunctionWriter.cpp
>===================================================================
>--- Source/WebCore/Modules/webgpu/WHLSL/Metal/WHLSLFunctionWriter.cpp	(revision 245951)
>+++ Source/WebCore/Modules/webgpu/WHLSL/Metal/WHLSLFunctionWriter.cpp	(working copy)
>@@ -449,10 +449,8 @@ void FunctionDefinitionWriter::visit(AST
>     if (variableDeclaration.initializer()) {
>         checkErrorAndVisit(*variableDeclaration.initializer());
>         m_stringBuilder.append(makeString(m_typeNamer.mangledNameForType(*variableDeclaration.type()), ' ', variableName, " = ", m_stack.takeLast(), ";\n"));
>-    } else {
>-        // FIXME: https://bugs.webkit.org/show_bug.cgi?id=195771 Zero-fill the variable.
>+    } else
>         m_stringBuilder.append(makeString(m_typeNamer.mangledNameForType(*variableDeclaration.type()), ' ', variableName, ";\n"));
>-    }
> }
> 
> void FunctionDefinitionWriter::visit(AST::AssignmentExpression& assignmentExpression)
>Index: Source/WebCore/Modules/webgpu/WHLSL/Metal/WHLSLNativeFunctionWriter.cpp
>===================================================================
>--- Source/WebCore/Modules/webgpu/WHLSL/Metal/WHLSLNativeFunctionWriter.cpp	(revision 245951)
>+++ Source/WebCore/Modules/webgpu/WHLSL/Metal/WHLSLNativeFunctionWriter.cpp	(working copy)
>@@ -104,7 +104,10 @@ String writeNativeFunction(AST::NativeFu
>         if (!nativeFunctionDeclaration.parameters().size()) {
>             stringBuilder.append(makeString(metalReturnName, ' ', outputFunctionName, "() {\n"));
>             stringBuilder.append(makeString("    ", metalReturnName, " x;\n"));
>-            // FIXME: https://bugs.webkit.org/show_bug.cgi?id=195771 Zero-fill
>+            stringBuilder.append("    thread char* ptr = static_cast<thread char*>(static_cast<thread void*>(&x));\n");
>+            stringBuilder.append(makeString("    for (size_t i = 0; i < sizeof(", metalReturnName, "); ++i) {\n"));
>+            stringBuilder.append("        ptr[i] = 0;\n");
>+            stringBuilder.append("    }\n");
>             stringBuilder.append("    return x;\n");
>             stringBuilder.append("}\n");
>             return stringBuilder.toString();
>Index: Source/WebCore/WebCore.xcodeproj/project.pbxproj
>===================================================================
>--- Source/WebCore/WebCore.xcodeproj/project.pbxproj	(revision 245951)
>+++ Source/WebCore/WebCore.xcodeproj/project.pbxproj	(working copy)
>@@ -8345,6 +8345,8 @@
> 		52B0D4BD1C57FD1E0077CE53 /* PlatformView.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = PlatformView.h; sourceTree = "<group>"; };
> 		52B0D4BF1C57FD660077CE53 /* VideoFullscreenChangeObserver.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = VideoFullscreenChangeObserver.h; sourceTree = "<group>"; };
> 		52B0D4C11C57FF910077CE53 /* VideoFullscreenInterfaceMac.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = VideoFullscreenInterfaceMac.h; sourceTree = "<group>"; };
>+		52B3434922A0752200E49389 /* WHLSLAutoInitializeVariables.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = WHLSLAutoInitializeVariables.h; sourceTree = "<group>"; };
>+		52B3434B22A0752300E49389 /* WHLSLAutoInitializeVariables.cpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; path = WHLSLAutoInitializeVariables.cpp; sourceTree = "<group>"; };
> 		52D5A18D1C54590300DE34A3 /* VideoFullscreenLayerManagerObjC.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = VideoFullscreenLayerManagerObjC.mm; sourceTree = "<group>"; };
> 		52D5A18E1C54590300DE34A3 /* VideoFullscreenLayerManagerObjC.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = VideoFullscreenLayerManagerObjC.h; sourceTree = "<group>"; };
> 		52D5A1A41C57488900DE34A3 /* VideoFullscreenModel.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = VideoFullscreenModel.h; sourceTree = "<group>"; };
>@@ -25434,6 +25436,8 @@
> 				1CECB3AD21F2B96400F44542 /* Metal */,
> 				C20F88AA22966B0E00D610FA /* WHLSLASTDumper.cpp */,
> 				C20F88AC22966B0F00D610FA /* WHLSLASTDumper.h */,
>+				52B3434B22A0752300E49389 /* WHLSLAutoInitializeVariables.cpp */,
>+				52B3434922A0752200E49389 /* WHLSLAutoInitializeVariables.h */,
> 				C234A9B221E92C1F003C984D /* WHLSLCheckDuplicateFunctions.cpp */,
> 				C234A9AE21E92C1A003C984D /* WHLSLCheckDuplicateFunctions.h */,
> 				1C840B9B21EC400900D0500D /* WHLSLChecker.cpp */,
>Index: LayoutTests/ChangeLog
>===================================================================
>--- LayoutTests/ChangeLog	(revision 245951)
>+++ LayoutTests/ChangeLog	(working copy)
>@@ -1,3 +1,16 @@
>+2019-05-31  Saam Barati  <sbarati@apple.com>
>+
>+        [WHLSL] Implement zero-filling of types
>+        https://bugs.webkit.org/show_bug.cgi?id=195771
>+        <rdar://problem/50746291>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * webgpu/whlsl-zero-initialize-values-2-expected.html: Added.
>+        * webgpu/whlsl-zero-initialize-values-2.html: Added.
>+        * webgpu/whlsl-zero-initialize-values-expected.html: Added.
>+        * webgpu/whlsl-zero-initialize-values.html: Added.
>+
> 2019-05-30  Jer Noble  <jer.noble@apple.com>
> 
>         Video playback in Safari should continue when CarPlay is plugged in
>Index: LayoutTests/webgpu/whlsl-zero-initialize-values-2-expected.html
>===================================================================
>--- LayoutTests/webgpu/whlsl-zero-initialize-values-2-expected.html	(nonexistent)
>+++ LayoutTests/webgpu/whlsl-zero-initialize-values-2-expected.html	(working copy)
>@@ -0,0 +1,19 @@
>+<!DOCTYPE html>
>+<html>
>+<head>
>+</head>
>+<body>
>+<canvas id="canvas" width="400" height="400"></canvas>
>+<script>
>+async function start() {
>+    const canvas = document.getElementById("canvas");
>+    const context = canvas.getContext("2d");
>+    context.fillStyle = "blue";
>+    context.fillRect(0, 0, 400, 400);
>+    context.fillStyle = "black";
>+    context.fillRect(100, 100, 200, 200);
>+}
>+window.addEventListener("load", start);
>+</script>
>+</body>
>+</html>
>Index: LayoutTests/webgpu/whlsl-zero-initialize-values-2.html
>===================================================================
>--- LayoutTests/webgpu/whlsl-zero-initialize-values-2.html	(nonexistent)
>+++ LayoutTests/webgpu/whlsl-zero-initialize-values-2.html	(working copy)
>@@ -0,0 +1,152 @@
>+<!DOCTYPE html>
>+<html>
>+<head>
>+</head>
>+<body>
>+<canvas id="canvas" width="400" height="400"></canvas>
>+<script>
>+const shaderSource = `
>+struct VertexOut {
>+    float4 position : SV_Position;
>+    float shade : attribute(0);
>+}
>+
>+struct Bar {
>+    float y;
>+    float y1;
>+    float y2;
>+    float y3;
>+    float y4;
>+    float y5;
>+    float y6;
>+    float y7;
>+    float y8;
>+    float y9;
>+    float y10;
>+    float y11;
>+    float y12;
>+    float y13;
>+    float y14;
>+    float y15;
>+    float y16;
>+    float y17;
>+    float y18;
>+    float y19;
>+    float y20;
>+}
>+
>+vertex VertexOut vertexShader(float4 position : attribute(0), float shade : attribute(1)) {
>+    VertexOut result;
>+
>+    Bar bar;
>+
>+    result.position = position;
>+    result.shade = bar.y20;
>+
>+    return result;
>+}
>+
>+fragment float4 fragmentShader(float shade : attribute(0)) : SV_Target 0 {
>+    return float4(shade, shade, shade, 1.0);
>+}
>+`;
>+async function start() {
>+    const adapter = await navigator.gpu.requestAdapter();
>+    const device = await adapter.requestDevice();
>+
>+    const shaderModule = device.createShaderModule({code: shaderSource, isWHLSL: true});
>+    const vertexStage = {module: shaderModule, entryPoint: "vertexShader"};
>+    const fragmentStage = {module: shaderModule, entryPoint: "fragmentShader"};
>+    const primitiveTopology = "triangle-strip";
>+    const rasterizationState = {frontFace: "cw", cullMode: "none"};
>+    const alphaBlend = {};
>+    const colorBlend = {};
>+    const colorStates = [{format: "rgba8unorm", alphaBlend, colorBlend, writeMask: 15}]; // GPUColorWriteBits.ALL
>+    const depthStencilState = null;
>+
>+    const attribute0 = {shaderLocation: 0, format: "float4", offset: 0};
>+    const attribute1 = {shaderLocation: 1, format: "float", offset: 16};
>+    const attributes = [attribute0, attribute1];
>+    const input0 = {stride: 20, attributeSet: attributes};
>+    const inputs = [input0];
>+    const vertexInput = {vertexBuffers: inputs};
>+
>+    const bindGroupLayoutDescriptor = {bindings: [{binding: 0, visibility: 7, type: "uniform-buffer"}]};
>+    const bindGroupLayout = device.createBindGroupLayout(bindGroupLayoutDescriptor);
>+    const pipelineLayoutDescriptor = {bindGroupLayouts: [bindGroupLayout]};
>+    const pipelineLayout = device.createPipelineLayout(pipelineLayoutDescriptor);
>+
>+    const renderPipelineDescriptor = {vertexStage, fragmentStage, primitiveTopology, rasterizationState, colorStates, depthStencilState, vertexInput, sampleCount: 1, layout: pipelineLayout};
>+    const renderPipeline = device.createRenderPipeline(renderPipelineDescriptor);
>+
>+    const vertexBuffer0Descriptor = {size: Float32Array.BYTES_PER_ELEMENT * 5 * 4, usage: GPUBufferUsage.VERTEX | GPUBufferUsage.MAP_WRITE};
>+    const vertexBuffer0 = device.createBuffer(vertexBuffer0Descriptor);
>+    const vertexBuffer0ArrayBuffer = await vertexBuffer0.mapWriteAsync();
>+    const vertexBuffer0Float32Array = new Float32Array(vertexBuffer0ArrayBuffer);
>+    vertexBuffer0Float32Array[0] = -0.5;
>+    vertexBuffer0Float32Array[1] = -0.5;
>+    vertexBuffer0Float32Array[2] = 1.0;
>+    vertexBuffer0Float32Array[3] = 1.0;
>+    vertexBuffer0Float32Array[4] = 1.0;
>+
>+    vertexBuffer0Float32Array[5] = -0.5;
>+    vertexBuffer0Float32Array[6] = 0.5;
>+    vertexBuffer0Float32Array[7] = 1.0;
>+    vertexBuffer0Float32Array[8] = 1.0;
>+    vertexBuffer0Float32Array[9] = 1.0;
>+
>+    vertexBuffer0Float32Array[10] = 0.5;
>+    vertexBuffer0Float32Array[11] = -0.5;
>+    vertexBuffer0Float32Array[12] = 1.0;
>+    vertexBuffer0Float32Array[13] = 1.0;
>+    vertexBuffer0Float32Array[14] = 1.0;
>+
>+    vertexBuffer0Float32Array[15] = 0.5;
>+    vertexBuffer0Float32Array[16] = 0.5;
>+    vertexBuffer0Float32Array[17] = 1.0;
>+    vertexBuffer0Float32Array[18] = 1.0;
>+    vertexBuffer0Float32Array[19] = 1.0;
>+    vertexBuffer0.unmap();
>+
>+    const resourceBufferDescriptor = {size: Float32Array.BYTES_PER_ELEMENT, usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.MAP_WRITE};
>+    const resourceBuffer = device.createBuffer(resourceBufferDescriptor);
>+    const resourceBufferArrayBuffer = await resourceBuffer.mapWriteAsync();
>+    const resourceBufferFloat32Array = new Float32Array(resourceBufferArrayBuffer);
>+    resourceBufferFloat32Array[0] = 1;
>+    resourceBuffer.unmap();
>+
>+    const bufferBinding = {buffer: resourceBuffer, size: 4};
>+    const bindGroupBinding = {binding: 0, resource: bufferBinding};
>+    const bindGroupDescriptor = {layout: bindGroupLayout, bindings: [bindGroupBinding]};
>+    const bindGroup = device.createBindGroup(bindGroupDescriptor);
>+
>+    const canvas = document.getElementById("canvas");
>+    const context = canvas.getContext("gpu");
>+    const swapChainDescriptor = {device, format: "bgra8unorm"};
>+    const swapChain = context.configureSwapChain(swapChainDescriptor);
>+    const outputTexture = swapChain.getCurrentTexture();
>+    const outputTextureView = outputTexture.createDefaultView();
>+
>+    const commandEncoder = device.createCommandEncoder(); // {}
>+    const red = {r: 0, g: 0, b: 1, a: 1};
>+    const colorAttachments = [{attachment: outputTextureView, resolveTarget: null, loadOp: "clear", storeOp: "store", clearColor: red}];
>+    const depthStencilAttachment = null;
>+    const renderPassDescriptor = {colorAttachments, depthStencilAttachment};
>+    const renderPassEncoder = commandEncoder.beginRenderPass(renderPassDescriptor);
>+    renderPassEncoder.setPipeline(renderPipeline);
>+    renderPassEncoder.setBindGroup(0, bindGroup);
>+    renderPassEncoder.setVertexBuffers(0, [vertexBuffer0], [0]);
>+    renderPassEncoder.draw(4, 1, 0, 0);
>+    renderPassEncoder.endPass();
>+    const commandBuffer = commandEncoder.finish();
>+    device.getQueue().submit([commandBuffer]);
>+
>+    if (window.testRunner)
>+        testRunner.notifyDone();
>+}
>+if (window.testRunner)
>+    testRunner.waitUntilDone();
>+window.addEventListener("load", start);
>+</script>
>+</body>
>+</html>
>Index: LayoutTests/webgpu/whlsl-zero-initialize-values-expected.html
>===================================================================
>--- LayoutTests/webgpu/whlsl-zero-initialize-values-expected.html	(nonexistent)
>+++ LayoutTests/webgpu/whlsl-zero-initialize-values-expected.html	(working copy)
>@@ -0,0 +1,19 @@
>+<!DOCTYPE html>
>+<html>
>+<head>
>+</head>
>+<body>
>+<canvas id="canvas" width="400" height="400"></canvas>
>+<script>
>+async function start() {
>+    const canvas = document.getElementById("canvas");
>+    const context = canvas.getContext("2d");
>+    context.fillStyle = "blue";
>+    context.fillRect(0, 0, 400, 400);
>+    context.fillStyle = "black";
>+    context.fillRect(100, 100, 200, 200);
>+}
>+window.addEventListener("load", start);
>+</script>
>+</body>
>+</html>
>Index: LayoutTests/webgpu/whlsl-zero-initialize-values.html
>===================================================================
>--- LayoutTests/webgpu/whlsl-zero-initialize-values.html	(nonexistent)
>+++ LayoutTests/webgpu/whlsl-zero-initialize-values.html	(working copy)
>@@ -0,0 +1,135 @@
>+<!DOCTYPE html>
>+<html>
>+<head>
>+</head>
>+<body>
>+<canvas id="canvas" width="400" height="400"></canvas>
>+<script>
>+const shaderSource = `
>+struct VertexOut {
>+    float4 position : SV_Position;
>+    float shade : attribute(0);
>+}
>+
>+thread float* ptr() {
>+    float local;
>+    return &local;
>+}
>+
>+vertex VertexOut vertexShader(float4 position : attribute(0), float shade : attribute(1)) {
>+    VertexOut result;
>+
>+    thread float* p = ptr();
>+    *p = 1.0;
>+    float value = *ptr(); // calling ptr() zero initializes.
>+
>+    result.position = position;
>+    result.shade = value;
>+
>+    return result;
>+}
>+
>+fragment float4 fragmentShader(float shade : attribute(0)) : SV_Target 0 {
>+    return float4(shade, shade, shade, 1.0);
>+}
>+`;
>+async function start() {
>+    const adapter = await navigator.gpu.requestAdapter();
>+    const device = await adapter.requestDevice();
>+
>+    const shaderModule = device.createShaderModule({code: shaderSource, isWHLSL: true});
>+    const vertexStage = {module: shaderModule, entryPoint: "vertexShader"};
>+    const fragmentStage = {module: shaderModule, entryPoint: "fragmentShader"};
>+    const primitiveTopology = "triangle-strip";
>+    const rasterizationState = {frontFace: "cw", cullMode: "none"};
>+    const alphaBlend = {};
>+    const colorBlend = {};
>+    const colorStates = [{format: "rgba8unorm", alphaBlend, colorBlend, writeMask: 15}]; // GPUColorWriteBits.ALL
>+    const depthStencilState = null;
>+
>+    const attribute0 = {shaderLocation: 0, format: "float4", offset: 0};
>+    const attribute1 = {shaderLocation: 1, format: "float", offset: 16};
>+    const attributes = [attribute0, attribute1];
>+    const input0 = {stride: 20, attributeSet: attributes};
>+    const inputs = [input0];
>+    const vertexInput = {vertexBuffers: inputs};
>+
>+    const bindGroupLayoutDescriptor = {bindings: [{binding: 0, visibility: 7, type: "uniform-buffer"}]};
>+    const bindGroupLayout = device.createBindGroupLayout(bindGroupLayoutDescriptor);
>+    const pipelineLayoutDescriptor = {bindGroupLayouts: [bindGroupLayout]};
>+    const pipelineLayout = device.createPipelineLayout(pipelineLayoutDescriptor);
>+
>+    const renderPipelineDescriptor = {vertexStage, fragmentStage, primitiveTopology, rasterizationState, colorStates, depthStencilState, vertexInput, sampleCount: 1, layout: pipelineLayout};
>+    const renderPipeline = device.createRenderPipeline(renderPipelineDescriptor);
>+
>+    const vertexBuffer0Descriptor = {size: Float32Array.BYTES_PER_ELEMENT * 5 * 4, usage: GPUBufferUsage.VERTEX | GPUBufferUsage.MAP_WRITE};
>+    const vertexBuffer0 = device.createBuffer(vertexBuffer0Descriptor);
>+    const vertexBuffer0ArrayBuffer = await vertexBuffer0.mapWriteAsync();
>+    const vertexBuffer0Float32Array = new Float32Array(vertexBuffer0ArrayBuffer);
>+    vertexBuffer0Float32Array[0] = -0.5;
>+    vertexBuffer0Float32Array[1] = -0.5;
>+    vertexBuffer0Float32Array[2] = 1.0;
>+    vertexBuffer0Float32Array[3] = 1.0;
>+    vertexBuffer0Float32Array[4] = 1.0;
>+
>+    vertexBuffer0Float32Array[5] = -0.5;
>+    vertexBuffer0Float32Array[6] = 0.5;
>+    vertexBuffer0Float32Array[7] = 1.0;
>+    vertexBuffer0Float32Array[8] = 1.0;
>+    vertexBuffer0Float32Array[9] = 1.0;
>+
>+    vertexBuffer0Float32Array[10] = 0.5;
>+    vertexBuffer0Float32Array[11] = -0.5;
>+    vertexBuffer0Float32Array[12] = 1.0;
>+    vertexBuffer0Float32Array[13] = 1.0;
>+    vertexBuffer0Float32Array[14] = 1.0;
>+
>+    vertexBuffer0Float32Array[15] = 0.5;
>+    vertexBuffer0Float32Array[16] = 0.5;
>+    vertexBuffer0Float32Array[17] = 1.0;
>+    vertexBuffer0Float32Array[18] = 1.0;
>+    vertexBuffer0Float32Array[19] = 1.0;
>+    vertexBuffer0.unmap();
>+
>+    const resourceBufferDescriptor = {size: Float32Array.BYTES_PER_ELEMENT, usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.MAP_WRITE};
>+    const resourceBuffer = device.createBuffer(resourceBufferDescriptor);
>+    const resourceBufferArrayBuffer = await resourceBuffer.mapWriteAsync();
>+    const resourceBufferFloat32Array = new Float32Array(resourceBufferArrayBuffer);
>+    resourceBufferFloat32Array[0] = 1;
>+    resourceBuffer.unmap();
>+
>+    const bufferBinding = {buffer: resourceBuffer, size: 4};
>+    const bindGroupBinding = {binding: 0, resource: bufferBinding};
>+    const bindGroupDescriptor = {layout: bindGroupLayout, bindings: [bindGroupBinding]};
>+    const bindGroup = device.createBindGroup(bindGroupDescriptor);
>+
>+    const canvas = document.getElementById("canvas");
>+    const context = canvas.getContext("gpu");
>+    const swapChainDescriptor = {device, format: "bgra8unorm"};
>+    const swapChain = context.configureSwapChain(swapChainDescriptor);
>+    const outputTexture = swapChain.getCurrentTexture();
>+    const outputTextureView = outputTexture.createDefaultView();
>+
>+    const commandEncoder = device.createCommandEncoder(); // {}
>+    const red = {r: 0, g: 0, b: 1, a: 1};
>+    const colorAttachments = [{attachment: outputTextureView, resolveTarget: null, loadOp: "clear", storeOp: "store", clearColor: red}];
>+    const depthStencilAttachment = null;
>+    const renderPassDescriptor = {colorAttachments, depthStencilAttachment};
>+    const renderPassEncoder = commandEncoder.beginRenderPass(renderPassDescriptor);
>+    renderPassEncoder.setPipeline(renderPipeline);
>+    renderPassEncoder.setBindGroup(0, bindGroup);
>+    renderPassEncoder.setVertexBuffers(0, [vertexBuffer0], [0]);
>+    renderPassEncoder.draw(4, 1, 0, 0);
>+    renderPassEncoder.endPass();
>+    const commandBuffer = commandEncoder.finish();
>+    device.getQueue().submit([commandBuffer]);
>+
>+    if (window.testRunner)
>+        testRunner.notifyDone();
>+}
>+if (window.testRunner)
>+    testRunner.waitUntilDone();
>+window.addEventListener("load", start);
>+</script>
>+</body>
>+</html>

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Attachments on bug 195771: 371047