Source/JavaScriptCore/wasm/js/JSWebAssemblyInstance.cpp - WebKit - Git at Google

 /*
  * Copyright (C) 2016-2021 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.
  */

 #include "config.h"
 #include "JSWebAssemblyInstance.h"

 #if ENABLE(WEBASSEMBLY)

 #include "AbstractModuleRecord.h"
 #include "JSCInlines.h"
 #include "JSModuleNamespaceObject.h"
 #include "JSWebAssemblyLinkError.h"
 #include "JSWebAssemblyMemory.h"
 #include "JSWebAssemblyModule.h"
 #include "WebAssemblyModuleRecord.h"
 #include <wtf/StdLibExtras.h>

 namespace JSC {

 const ClassInfo JSWebAssemblyInstance::s_info = { "WebAssembly.Instance", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSWebAssemblyInstance) };

 Structure* JSWebAssemblyInstance::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
 {
     return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
 }

 JSWebAssemblyInstance::JSWebAssemblyInstance(VM& vm, Structure* structure, Ref<Wasm::Instance>&& instance)
     : Base(vm, structure)
     , m_instance(WTFMove(instance))
     , m_vm(&vm)
     , m_globalObject(vm, this, structure->globalObject())
     , m_tables(m_instance->module().moduleInformation().tableCount())
 {
     m_instance->setOwner(this);
     for (unsigned i = 0; i < this->instance().numImportFunctions(); ++i)
         new (this->instance().importFunction<WriteBarrier<JSObject>>(i)) WriteBarrier<JSObject>();
 }

 void JSWebAssemblyInstance::finishCreation(VM& vm, JSWebAssemblyModule* module, WebAssemblyModuleRecord* moduleRecord)
 {
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));

     m_module.set(vm, this, module);
     m_moduleRecord.set(vm, this, moduleRecord);

     vm.heap.reportExtraMemoryAllocated(m_instance->extraMemoryAllocated());
 }

 void JSWebAssemblyInstance::destroy(JSCell* cell)
 {
     static_cast<JSWebAssemblyInstance*>(cell)->JSWebAssemblyInstance::~JSWebAssemblyInstance();
 }

 template<typename Visitor>
 void JSWebAssemblyInstance::visitChildrenImpl(JSCell* cell, Visitor& visitor)
 {
     auto* thisObject = jsCast<JSWebAssemblyInstance*>(cell);
     ASSERT_GC_OBJECT_INHERITS(thisObject, info());

     Base::visitChildren(thisObject, visitor);
     visitor.append(thisObject->m_module);
     visitor.append(thisObject->m_moduleRecord);
     visitor.append(thisObject->m_memory);
     for (auto& table : thisObject->m_tables)
         visitor.append(table);
     visitor.reportExtraMemoryVisited(thisObject->m_instance->extraMemoryAllocated());
     for (unsigned i = 0; i < thisObject->instance().numImportFunctions(); ++i)
         visitor.append(*thisObject->instance().importFunction<WriteBarrier<JSObject>>(i)); // This also keeps the functions' JSWebAssemblyInstance alive.

     for (size_t i : thisObject->instance().globalsToBinding()) {
         Wasm::Global* binding = thisObject->instance().getGlobalBinding(i);
         if (binding)
             visitor.appendUnbarriered(binding->owner<JSWebAssemblyGlobal>());
     }
     for (size_t i : thisObject->instance().globalsToMark())
         visitor.appendUnbarriered(JSValue::decode(thisObject->instance().loadI64Global(i)));

     Locker locker { cell->cellLock() };
     for (auto& wrapper : thisObject->instance().functionWrappers())
         visitor.appendUnbarriered(wrapper.get());
 }

 DEFINE_VISIT_CHILDREN(JSWebAssemblyInstance);

 void JSWebAssemblyInstance::initializeImports(JSGlobalObject* globalObject, JSObject* importObject, Wasm::CreationMode creationMode)
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     m_moduleRecord->prepareLink(vm, this);
     if (creationMode == Wasm::CreationMode::FromJS) {
         m_moduleRecord->link(globalObject, jsNull());
         RETURN_IF_EXCEPTION(scope, void());
         m_moduleRecord->initializeImports(globalObject, importObject, creationMode);
         RETURN_IF_EXCEPTION(scope, void());
     }
 }

 void JSWebAssemblyInstance::finalizeCreation(VM& vm, JSGlobalObject* globalObject, Ref<Wasm::CalleeGroup>&& wasmCalleeGroup, Wasm::CreationMode creationMode)
 {
     auto scope = DECLARE_THROW_SCOPE(vm);

     if (!wasmCalleeGroup->runnable()) {
         throwException(globalObject, scope, createJSWebAssemblyLinkError(globalObject, vm, wasmCalleeGroup->errorMessage()));
         return;
     }

     RELEASE_ASSERT(wasmCalleeGroup->isSafeToRun(memoryMode()));

     // When memory is imported, we will initialize all memory modes with the initial LLInt compilation
     // results, so that later when memory imports become available, the appropriate CalleeGroup can be used.
     // If LLInt is disabled, we instead defer compilation to module evaluation.
     // If the code is already compiled, e.g. the module was already instantiated before, we do not re-initialize.
     if (Options::useWasmLLInt() && module()->moduleInformation().hasMemoryImport())
         module()->module().copyInitialCalleeGroupToAllMemoryModes(memoryMode());

     for (unsigned importFunctionNum = 0; importFunctionNum < instance().numImportFunctions(); ++importFunctionNum) {
         auto* info = instance().importFunctionInfo(importFunctionNum);
         info->wasmToEmbedderStub = m_module->wasmToEmbedderStub(importFunctionNum);
     }

     if (creationMode == Wasm::CreationMode::FromJS) {
         m_moduleRecord->initializeExports(globalObject);
         RETURN_IF_EXCEPTION(scope, void());

         JSValue startResult = m_moduleRecord->evaluate(globalObject);
         UNUSED_PARAM(startResult);
         RETURN_IF_EXCEPTION(scope, void());
     }
 }

 Identifier JSWebAssemblyInstance::createPrivateModuleKey()
 {
     return Identifier::fromUid(PrivateName(PrivateName::Description, "WebAssemblyInstance"));
 }

 JSWebAssemblyInstance* JSWebAssemblyInstance::tryCreate(VM& vm, JSGlobalObject* globalObject, const Identifier& moduleKey, JSWebAssemblyModule* jsModule, JSObject* importObject, Structure* instanceStructure, Ref<Wasm::Module>&& module, Wasm::CreationMode creationMode)
 {
     auto throwScope = DECLARE_THROW_SCOPE(vm);

     const Wasm::ModuleInformation& moduleInformation = jsModule->moduleInformation();

     auto exception = [&] (JSObject* error) {
         throwException(globalObject, throwScope, error);
         return nullptr;
     };

     if (!globalObject->webAssemblyEnabled())
         return exception(createEvalError(globalObject, globalObject->webAssemblyDisabledErrorMessage()));

     WebAssemblyModuleRecord* moduleRecord = WebAssemblyModuleRecord::create(globalObject, vm, globalObject->webAssemblyModuleRecordStructure(), moduleKey, moduleInformation);
     RETURN_IF_EXCEPTION(throwScope, nullptr);

     auto storeTopCallFrame = [&vm] (void* topCallFrame) {
         vm.topCallFrame = bitwise_cast<CallFrame*>(topCallFrame);
     };

     // FIXME: These objects could be pretty big we should try to throw OOM here.
     auto* jsInstance = new (NotNull, allocateCell<JSWebAssemblyInstance>(vm)) JSWebAssemblyInstance(vm, instanceStructure,
         Wasm::Instance::create(&vm.wasmContext, WTFMove(module), &vm.topEntryFrame, vm.addressOfSoftStackLimit(), WTFMove(storeTopCallFrame)));
     jsInstance->finishCreation(vm, jsModule, moduleRecord);
     RETURN_IF_EXCEPTION(throwScope, nullptr);

     if (creationMode == Wasm::CreationMode::FromJS) {
         // If the list of module.imports is not empty and Type(importObject) is not Object, a TypeError is thrown.
         if (moduleInformation.imports.size() && !importObject)
             return exception(createTypeError(globalObject, "can't make WebAssembly.Instance because there is no imports Object and the WebAssembly.Module requires imports"_s));
     }

     // For each import i in module.imports:
     for (auto& import : moduleInformation.imports) {
         Identifier moduleName = Identifier::fromString(vm, String::fromUTF8(import.module));
         Identifier fieldName = Identifier::fromString(vm, String::fromUTF8(import.field));
         moduleRecord->appendRequestedModule(moduleName);
         moduleRecord->addImportEntry(WebAssemblyModuleRecord::ImportEntry {
             WebAssemblyModuleRecord::ImportEntryType::Single,
             moduleName,
             fieldName,
             Identifier::fromUid(PrivateName(PrivateName::Description, "WebAssemblyImportName")),
         });
     }
     ASSERT(moduleRecord->importEntries().size() == moduleInformation.imports.size());

     bool hasMemoryImport = moduleInformation.memory.isImport();
     if (moduleInformation.memory && !hasMemoryImport) {
         // We create a memory when it's a memory definition.
         auto* jsMemory = JSWebAssemblyMemory::tryCreate(globalObject, vm, globalObject->webAssemblyMemoryStructure());
         RETURN_IF_EXCEPTION(throwScope, nullptr);

         RefPtr<Wasm::Memory> memory = Wasm::Memory::tryCreate(moduleInformation.memory.initial(), moduleInformation.memory.maximum(), moduleInformation.memory.isShared() ? Wasm::MemorySharingMode::Shared: Wasm::MemorySharingMode::Default,
             [&vm](Wasm::Memory::NotifyPressure) { vm.heap.collectAsync(CollectionScope::Full); },
             [&vm](Wasm::Memory::SyncTryToReclaim) { vm.heap.collectSync(CollectionScope::Full); },
             [&vm, jsMemory](Wasm::Memory::GrowSuccess, Wasm::PageCount oldPageCount, Wasm::PageCount newPageCount) { jsMemory->growSuccessCallback(vm, oldPageCount, newPageCount); }
         );
         if (!memory)
             return exception(createOutOfMemoryError(globalObject));

         jsMemory->adopt(memory.releaseNonNull());
         jsInstance->setMemory(vm, jsMemory);
         RETURN_IF_EXCEPTION(throwScope, nullptr);
     }

     if (!jsInstance->memory()) {
         // Make sure we have a dummy memory, so that wasm -> wasm thunks avoid checking for a nullptr Memory when trying to set pinned registers.
         // When there is a memory import, this will be replaced later in the module record import initialization.
         auto* jsMemory = JSWebAssemblyMemory::tryCreate(globalObject, vm, globalObject->webAssemblyMemoryStructure());
         RETURN_IF_EXCEPTION(throwScope, nullptr);
         jsMemory->adopt(Wasm::Memory::create());
         jsInstance->setMemory(vm, jsMemory);
         RETURN_IF_EXCEPTION(throwScope, nullptr);
     }

     return jsInstance;
 }

 } // namespace JSC

 #endif // ENABLE(WEBASSEMBLY)
	/*
	* Copyright (C) 2016-2021 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.
	*/

	#include "config.h"
	#include "JSWebAssemblyInstance.h"

	#if ENABLE(WEBASSEMBLY)

	#include "AbstractModuleRecord.h"
	#include "JSCInlines.h"
	#include "JSModuleNamespaceObject.h"
	#include "JSWebAssemblyLinkError.h"
	#include "JSWebAssemblyMemory.h"
	#include "JSWebAssemblyModule.h"
	#include "WebAssemblyModuleRecord.h"
	#include <wtf/StdLibExtras.h>

	namespace JSC {

	const ClassInfo JSWebAssemblyInstance::s_info = { "WebAssembly.Instance", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSWebAssemblyInstance) };

	Structure* JSWebAssemblyInstance::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
	{
	return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
	}

	JSWebAssemblyInstance::JSWebAssemblyInstance(VM& vm, Structure* structure, Ref<Wasm::Instance>&& instance)
	: Base(vm, structure)
	, m_instance(WTFMove(instance))
	, m_vm(&vm)
	, m_globalObject(vm, this, structure->globalObject())
	, m_tables(m_instance->module().moduleInformation().tableCount())
	{
	m_instance->setOwner(this);
	for (unsigned i = 0; i < this->instance().numImportFunctions(); ++i)
	new (this->instance().importFunction<WriteBarrier<JSObject>>(i)) WriteBarrier<JSObject>();
	}

	void JSWebAssemblyInstance::finishCreation(VM& vm, JSWebAssemblyModule* module, WebAssemblyModuleRecord* moduleRecord)
	{
	Base::finishCreation(vm);
	ASSERT(inherits(vm, info()));

	m_module.set(vm, this, module);
	m_moduleRecord.set(vm, this, moduleRecord);

	vm.heap.reportExtraMemoryAllocated(m_instance->extraMemoryAllocated());
	}

	void JSWebAssemblyInstance::destroy(JSCell* cell)
	{
	static_cast<JSWebAssemblyInstance*>(cell)->JSWebAssemblyInstance::~JSWebAssemblyInstance();
	}

	template<typename Visitor>
	void JSWebAssemblyInstance::visitChildrenImpl(JSCell* cell, Visitor& visitor)
	{
	auto* thisObject = jsCast<JSWebAssemblyInstance*>(cell);
	ASSERT_GC_OBJECT_INHERITS(thisObject, info());

	Base::visitChildren(thisObject, visitor);
	visitor.append(thisObject->m_module);
	visitor.append(thisObject->m_moduleRecord);
	visitor.append(thisObject->m_memory);
	for (auto& table : thisObject->m_tables)
	visitor.append(table);
	visitor.reportExtraMemoryVisited(thisObject->m_instance->extraMemoryAllocated());
	for (unsigned i = 0; i < thisObject->instance().numImportFunctions(); ++i)
	visitor.append(*thisObject->instance().importFunction<WriteBarrier<JSObject>>(i)); // This also keeps the functions' JSWebAssemblyInstance alive.

	for (size_t i : thisObject->instance().globalsToBinding()) {
	Wasm::Global* binding = thisObject->instance().getGlobalBinding(i);
	if (binding)
	visitor.appendUnbarriered(binding->owner<JSWebAssemblyGlobal>());
	}
	for (size_t i : thisObject->instance().globalsToMark())
	visitor.appendUnbarriered(JSValue::decode(thisObject->instance().loadI64Global(i)));

	Locker locker { cell->cellLock() };
	for (auto& wrapper : thisObject->instance().functionWrappers())
	visitor.appendUnbarriered(wrapper.get());
	}

	DEFINE_VISIT_CHILDREN(JSWebAssemblyInstance);

	void JSWebAssemblyInstance::initializeImports(JSGlobalObject* globalObject, JSObject* importObject, Wasm::CreationMode creationMode)
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	m_moduleRecord->prepareLink(vm, this);
	if (creationMode == Wasm::CreationMode::FromJS) {
	m_moduleRecord->link(globalObject, jsNull());
	RETURN_IF_EXCEPTION(scope, void());
	m_moduleRecord->initializeImports(globalObject, importObject, creationMode);
	RETURN_IF_EXCEPTION(scope, void());
	}
	}

	void JSWebAssemblyInstance::finalizeCreation(VM& vm, JSGlobalObject* globalObject, Ref<Wasm::CalleeGroup>&& wasmCalleeGroup, Wasm::CreationMode creationMode)
	{
	auto scope = DECLARE_THROW_SCOPE(vm);

	if (!wasmCalleeGroup->runnable()) {
	throwException(globalObject, scope, createJSWebAssemblyLinkError(globalObject, vm, wasmCalleeGroup->errorMessage()));
	return;
	}

	RELEASE_ASSERT(wasmCalleeGroup->isSafeToRun(memoryMode()));

	// When memory is imported, we will initialize all memory modes with the initial LLInt compilation
	// results, so that later when memory imports become available, the appropriate CalleeGroup can be used.
	// If LLInt is disabled, we instead defer compilation to module evaluation.
	// If the code is already compiled, e.g. the module was already instantiated before, we do not re-initialize.
	if (Options::useWasmLLInt() && module()->moduleInformation().hasMemoryImport())
	module()->module().copyInitialCalleeGroupToAllMemoryModes(memoryMode());

	for (unsigned importFunctionNum = 0; importFunctionNum < instance().numImportFunctions(); ++importFunctionNum) {
	auto* info = instance().importFunctionInfo(importFunctionNum);
	info->wasmToEmbedderStub = m_module->wasmToEmbedderStub(importFunctionNum);
	}

	if (creationMode == Wasm::CreationMode::FromJS) {
	m_moduleRecord->initializeExports(globalObject);
	RETURN_IF_EXCEPTION(scope, void());

	JSValue startResult = m_moduleRecord->evaluate(globalObject);
	UNUSED_PARAM(startResult);
	RETURN_IF_EXCEPTION(scope, void());
	}
	}

	Identifier JSWebAssemblyInstance::createPrivateModuleKey()
	{
	return Identifier::fromUid(PrivateName(PrivateName::Description, "WebAssemblyInstance"));
	}

	JSWebAssemblyInstance* JSWebAssemblyInstance::tryCreate(VM& vm, JSGlobalObject* globalObject, const Identifier& moduleKey, JSWebAssemblyModule* jsModule, JSObject* importObject, Structure* instanceStructure, Ref<Wasm::Module>&& module, Wasm::CreationMode creationMode)
	{
	auto throwScope = DECLARE_THROW_SCOPE(vm);

	const Wasm::ModuleInformation& moduleInformation = jsModule->moduleInformation();

	auto exception = [&] (JSObject* error) {
	throwException(globalObject, throwScope, error);
	return nullptr;
	};

	if (!globalObject->webAssemblyEnabled())
	return exception(createEvalError(globalObject, globalObject->webAssemblyDisabledErrorMessage()));

	WebAssemblyModuleRecord* moduleRecord = WebAssemblyModuleRecord::create(globalObject, vm, globalObject->webAssemblyModuleRecordStructure(), moduleKey, moduleInformation);
	RETURN_IF_EXCEPTION(throwScope, nullptr);

	auto storeTopCallFrame = [&vm] (void* topCallFrame) {
	vm.topCallFrame = bitwise_cast<CallFrame*>(topCallFrame);
	};

	// FIXME: These objects could be pretty big we should try to throw OOM here.
	auto* jsInstance = new (NotNull, allocateCell<JSWebAssemblyInstance>(vm)) JSWebAssemblyInstance(vm, instanceStructure,
	Wasm::Instance::create(&vm.wasmContext, WTFMove(module), &vm.topEntryFrame, vm.addressOfSoftStackLimit(), WTFMove(storeTopCallFrame)));
	jsInstance->finishCreation(vm, jsModule, moduleRecord);
	RETURN_IF_EXCEPTION(throwScope, nullptr);

	if (creationMode == Wasm::CreationMode::FromJS) {
	// If the list of module.imports is not empty and Type(importObject) is not Object, a TypeError is thrown.
	if (moduleInformation.imports.size() && !importObject)
	return exception(createTypeError(globalObject, "can't make WebAssembly.Instance because there is no imports Object and the WebAssembly.Module requires imports"_s));
	}

	// For each import i in module.imports:
	for (auto& import : moduleInformation.imports) {
	Identifier moduleName = Identifier::fromString(vm, String::fromUTF8(import.module));
	Identifier fieldName = Identifier::fromString(vm, String::fromUTF8(import.field));
	moduleRecord->appendRequestedModule(moduleName);
	moduleRecord->addImportEntry(WebAssemblyModuleRecord::ImportEntry {
	WebAssemblyModuleRecord::ImportEntryType::Single,
	moduleName,
	fieldName,
	Identifier::fromUid(PrivateName(PrivateName::Description, "WebAssemblyImportName")),
	});
	}
	ASSERT(moduleRecord->importEntries().size() == moduleInformation.imports.size());

	bool hasMemoryImport = moduleInformation.memory.isImport();
	if (moduleInformation.memory && !hasMemoryImport) {
	// We create a memory when it's a memory definition.
	auto* jsMemory = JSWebAssemblyMemory::tryCreate(globalObject, vm, globalObject->webAssemblyMemoryStructure());
	RETURN_IF_EXCEPTION(throwScope, nullptr);

	RefPtr<Wasm::Memory> memory = Wasm::Memory::tryCreate(moduleInformation.memory.initial(), moduleInformation.memory.maximum(), moduleInformation.memory.isShared() ? Wasm::MemorySharingMode::Shared: Wasm::MemorySharingMode::Default,
	[&vm](Wasm::Memory::NotifyPressure) { vm.heap.collectAsync(CollectionScope::Full); },
	[&vm](Wasm::Memory::SyncTryToReclaim) { vm.heap.collectSync(CollectionScope::Full); },
	[&vm, jsMemory](Wasm::Memory::GrowSuccess, Wasm::PageCount oldPageCount, Wasm::PageCount newPageCount) { jsMemory->growSuccessCallback(vm, oldPageCount, newPageCount); }
	);
	if (!memory)
	return exception(createOutOfMemoryError(globalObject));

	jsMemory->adopt(memory.releaseNonNull());
	jsInstance->setMemory(vm, jsMemory);
	RETURN_IF_EXCEPTION(throwScope, nullptr);
	}

	if (!jsInstance->memory()) {
	// Make sure we have a dummy memory, so that wasm -> wasm thunks avoid checking for a nullptr Memory when trying to set pinned registers.
	// When there is a memory import, this will be replaced later in the module record import initialization.
	auto* jsMemory = JSWebAssemblyMemory::tryCreate(globalObject, vm, globalObject->webAssemblyMemoryStructure());
	RETURN_IF_EXCEPTION(throwScope, nullptr);
	jsMemory->adopt(Wasm::Memory::create());
	jsInstance->setMemory(vm, jsMemory);
	RETURN_IF_EXCEPTION(throwScope, nullptr);
	}

	return jsInstance;
	}

	} // namespace JSC

	#endif // ENABLE(WEBASSEMBLY)