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diff --git a/Source/JavaScriptCore/wasm/js/WebAssemblyInstanceConstructor.cpp b/Source/JavaScriptCore/wasm/js/WebAssemblyInstanceConstructor.cpp
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+++ b/Source/JavaScriptCore/wasm/js/WebAssemblyInstanceConstructor.cpp
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+/*
+ * 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.
+ */
+
+#include "config.h"
+#include "WebAssemblyInstanceConstructor.h"
+
+#if ENABLE(WEBASSEMBLY)
+
+#include "FunctionPrototype.h"
+#include "JSCInlines.h"
+#include "JSModuleEnvironment.h"
+#include "JSModuleNamespaceObject.h"
+#include "JSWebAssemblyInstance.h"
+#include "JSWebAssemblyLinkError.h"
+#include "JSWebAssemblyMemory.h"
+#include "JSWebAssemblyModule.h"
+#include "WebAssemblyFunction.h"
+#include "WebAssemblyInstancePrototype.h"
+#include "WebAssemblyModuleRecord.h"
+
+#include "WebAssemblyInstanceConstructor.lut.h"
+
+namespace JSC {
+
+static const bool verbose = false;
+
+const ClassInfo WebAssemblyInstanceConstructor::s_info = { "Function", &Base::s_info, &constructorTableWebAssemblyInstance, CREATE_METHOD_TABLE(WebAssemblyInstanceConstructor) };
+
+/* Source for WebAssemblyInstanceConstructor.lut.h
+ @begin constructorTableWebAssemblyInstance
+ @end
+ */
+
+static EncodedJSValue JSC_HOST_CALL constructJSWebAssemblyInstance(ExecState* exec)
+{
+    auto& vm = exec->vm();
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    auto* globalObject = exec->lexicalGlobalObject();
+
+    // If moduleObject is not a WebAssembly.Module instance, a TypeError is thrown.
+    JSWebAssemblyModule* jsModule = jsDynamicCast<JSWebAssemblyModule*>(vm, exec->argument(0));
+    if (!jsModule)
+        return JSValue::encode(throwException(exec, throwScope, createTypeError(exec, ASCIILiteral("first argument to WebAssembly.Instance must be a WebAssembly.Module"), defaultSourceAppender, runtimeTypeForValue(exec->argument(0)))));
+    const Wasm::ModuleInformation& moduleInformation = jsModule->moduleInformation();
+
+    // If the importObject parameter is not undefined and Type(importObject) is not Object, a TypeError is thrown.
+    JSValue importArgument = exec->argument(1);
+    JSObject* importObject = importArgument.getObject();
+    if (!importArgument.isUndefined() && !importObject)
+        return JSValue::encode(throwException(exec, throwScope, createTypeError(exec, ASCIILiteral("second argument to WebAssembly.Instance must be undefined or an Object"), defaultSourceAppender, runtimeTypeForValue(importArgument))));
+
+    // 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 JSValue::encode(throwException(exec, throwScope, createTypeError(exec, ASCIILiteral("second argument to WebAssembly.Instance must be Object because the WebAssembly.Module has imports"), defaultSourceAppender, runtimeTypeForValue(importArgument))));
+
+    Identifier moduleKey = Identifier::fromUid(PrivateName(PrivateName::Description, "WebAssemblyInstance"));
+    WebAssemblyModuleRecord* moduleRecord = WebAssemblyModuleRecord::create(exec, vm, globalObject->webAssemblyModuleRecordStructure(), moduleKey, moduleInformation);
+    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+
+    Structure* instanceStructure = InternalFunction::createSubclassStructure(exec, exec->newTarget(), globalObject->WebAssemblyInstanceStructure());
+    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+
+    JSWebAssemblyInstance* instance = JSWebAssemblyInstance::create(vm, instanceStructure, jsModule, moduleRecord->getModuleNamespace(exec));
+    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+    {
+        // Always start with a dummy Memory, so that wasm -> wasm thunks avoid checking for a nullptr Memory when trying to set pinned registers.
+        Wasm::Memory memory;
+        instance->setMemory(vm, JSWebAssemblyMemory::create(vm, exec->lexicalGlobalObject()->WebAssemblyMemoryStructure(), WTFMove(memory)));
+    }
+
+    // Let funcs, memories and tables be initially-empty lists of callable JavaScript objects, WebAssembly.Memory objects and WebAssembly.Table objects, respectively.
+    // Let imports be an initially-empty list of external values.
+    unsigned numImportFunctions = 0;
+    unsigned numImportGlobals = 0;
+
+    bool hasMemoryImport = false;
+    bool hasTableImport = false;
+    // For each import i in module.imports:
+    for (auto& import : moduleInformation.imports) {
+        // 1. Let o be the resultant value of performing Get(importObject, i.module_name).
+        JSValue importModuleValue = importObject->get(exec, import.module);
+        RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+        // 2. If Type(o) is not Object, throw a TypeError.
+        if (!importModuleValue.isObject())
+            return JSValue::encode(throwException(exec, throwScope, createTypeError(exec, ASCIILiteral("import must be an object"), defaultSourceAppender, runtimeTypeForValue(importModuleValue))));
+
+        // 3. Let v be the value of performing Get(o, i.item_name)
+        JSObject* object = jsCast<JSObject*>(importModuleValue);
+        JSValue value = object->get(exec, import.field);
+        RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+
+        switch (import.kind) {
+        case Wasm::ExternalKind::Function: {
+            // 4. If i is a function import:
+            // i. If IsCallable(v) is false, throw a WebAssembly.LinkError.
+            if (!value.isFunction())
+                return JSValue::encode(throwException(exec, throwScope, createJSWebAssemblyLinkError(exec, vm, ASCIILiteral("import function must be callable"))));
+            JSCell* cell = value.asCell();
+            // ii. If v is an Exported Function Exotic Object:
+            if (WebAssemblyFunction* importedExport = jsDynamicCast<WebAssemblyFunction*>(vm, cell)) {
+                // a. If the signature of v does not match the signature of i, throw a WebAssembly.LinkError.
+                Wasm::SignatureIndex importedSignatureIndex = importedExport->signatureIndex();
+                Wasm::SignatureIndex expectedSignatureIndex = moduleInformation.importFunctionSignatureIndices[import.kindIndex];
+                if (importedSignatureIndex != expectedSignatureIndex)
+                    return JSValue::encode(throwException(exec, throwScope, createJSWebAssemblyLinkError(exec, vm, ASCIILiteral("imported function's signature doesn't match the provided WebAssembly function's signature"))));
+                // b. Let closure be v.[[Closure]].
+            }
+            // iii. Otherwise:
+            // a. Let closure be a new host function of the given signature which calls v by coercing WebAssembly arguments to JavaScript arguments via ToJSValue and returns the result, if any, by coercing via ToWebAssemblyValue.
+            // Note: done as part of Plan compilation.
+            // iv. Append v to funcs.
+            // Note: adding the JSCell to the instance list fulfills closure requirements b. above (the WebAssembly.Instance wil be kept alive) and v. below (the JSFunction).
+            instance->setImportFunction(vm, cell, numImportFunctions++);
+            // v. Append closure to imports.
+            break;
+        }
+        case Wasm::ExternalKind::Table: {
+            RELEASE_ASSERT(!hasTableImport); // This should be guaranteed by a validation failure.
+            // 7. Otherwise (i is a table import):
+            hasTableImport = true;
+            JSWebAssemblyTable* table = jsDynamicCast<JSWebAssemblyTable*>(vm, value);
+            // i. If v is not a WebAssembly.Table object, throw a WebAssembly.LinkError.
+            if (!table)
+                return JSValue::encode(throwException(exec, throwScope, createJSWebAssemblyLinkError(exec, vm, ASCIILiteral("Table import is not an instance of WebAssembly.Table"))));
+
+            uint32_t expectedInitial = moduleInformation.tableInformation.initial();
+            uint32_t actualInitial = table->size();
+            if (actualInitial < expectedInitial)
+                return JSValue::encode(throwException(exec, throwScope, createJSWebAssemblyLinkError(exec, vm, ASCIILiteral("Table import provided an 'initial' that is too small"))));
+
+            if (std::optional<uint32_t> expectedMaximum = moduleInformation.tableInformation.maximum()) {
+                std::optional<uint32_t> actualMaximum = table->maximum();
+                if (!actualMaximum) {
+                    return JSValue::encode(
+                        throwException(exec, throwScope, createJSWebAssemblyLinkError(exec, vm, ASCIILiteral("Table import does not have a 'maximum' but the module requires that it does"))));
+                }
+                if (*actualMaximum > *expectedMaximum) {
+                    return JSValue::encode(
+                        throwException(exec, throwScope, createJSWebAssemblyLinkError(exec, vm, ASCIILiteral("Imported Table's 'maximum' is larger than the module's expected 'maximum'"))));
+                }
+            }
+
+            // ii. Append v to tables.
+            // iii. Append v.[[Table]] to imports.
+            instance->setTable(vm, table);
+            break;
+        }
+        case Wasm::ExternalKind::Memory: {
+            // 6. If i is a memory import:
+            RELEASE_ASSERT(!hasMemoryImport); // This should be guaranteed by a validation failure.
+            RELEASE_ASSERT(moduleInformation.memory);
+            hasMemoryImport = true;
+            JSWebAssemblyMemory* memory = jsDynamicCast<JSWebAssemblyMemory*>(vm, value);
+            // i. If v is not a WebAssembly.Memory object, throw a WebAssembly.LinkError.
+            if (!memory)
+                return JSValue::encode(throwException(exec, throwScope, createJSWebAssemblyLinkError(exec, vm, ASCIILiteral("Memory import is not an instance of WebAssembly.Memory"))));
+
+            Wasm::PageCount expectedInitial = moduleInformation.memory.initial();
+            Wasm::PageCount actualInitial = memory->memory()->initial();
+            if (actualInitial < expectedInitial)
+                return JSValue::encode(throwException(exec, throwScope, createJSWebAssemblyLinkError(exec, vm, ASCIILiteral("Memory import provided an 'initial' that is too small"))));
+
+            if (Wasm::PageCount expectedMaximum = moduleInformation.memory.maximum()) {
+                Wasm::PageCount actualMaximum = memory->memory()->maximum();
+                if (!actualMaximum) {
+                    return JSValue::encode(
+                        throwException(exec, throwScope, createJSWebAssemblyLinkError(exec, vm, ASCIILiteral("Memory import did not have a 'maximum' but the module requires that it does"))));
+                }
+
+                if (actualMaximum > expectedMaximum) {
+                    return JSValue::encode(
+                        throwException(exec, throwScope, createJSWebAssemblyLinkError(exec, vm, ASCIILiteral("Memory imports 'maximum' is larger than the module's expected 'maximum'"))));
+                }
+            }
+            // ii. Append v to memories.
+            // iii. Append v.[[Memory]] to imports.
+            instance->setMemory(vm, memory);
+            break;
+        }
+        case Wasm::ExternalKind::Global: {
+            // 5. If i is a global import:
+            // i. If i is not an immutable global, throw a TypeError.
+            ASSERT(moduleInformation.globals[import.kindIndex].mutability == Wasm::Global::Immutable);
+            // ii. If Type(v) is not Number, throw a TypeError.
+            if (!value.isNumber())
+                return JSValue::encode(throwException(exec, throwScope, createJSWebAssemblyLinkError(exec, vm, ASCIILiteral("imported global must be a number"))));
+            // iii. Append ToWebAssemblyValue(v) to imports.
+            switch (moduleInformation.globals[import.kindIndex].type) {
+            case Wasm::I32:
+                instance->setGlobal(numImportGlobals++, value.toInt32(exec));
+                break;
+            case Wasm::F32:
+                instance->setGlobal(numImportGlobals++, bitwise_cast<uint32_t>(value.toFloat(exec)));
+                break;
+            case Wasm::F64:
+                instance->setGlobal(numImportGlobals++, bitwise_cast<uint64_t>(value.asNumber()));
+                break;
+            default:
+                RELEASE_ASSERT_NOT_REACHED();
+            }
+            ASSERT(!throwScope.exception());
+            break;
+        }
+        }
+    }
+
+    {
+        if (!!moduleInformation.memory && moduleInformation.memory.isImport()) {
+            // We should either have a Memory import or we should have thrown an exception.
+            RELEASE_ASSERT(hasMemoryImport);
+        }
+
+        if (moduleInformation.memory && !hasMemoryImport) {
+            RELEASE_ASSERT(!moduleInformation.memory.isImport());
+            // We create a memory when it's a memory definition.
+            bool failed;
+            Wasm::Memory memory(moduleInformation.memory.initial(), moduleInformation.memory.maximum(), failed);
+            if (failed)
+                return JSValue::encode(throwException(exec, throwScope, createOutOfMemoryError(exec)));
+            instance->setMemory(vm,
+               JSWebAssemblyMemory::create(vm, exec->lexicalGlobalObject()->WebAssemblyMemoryStructure(), WTFMove(memory)));
+        }
+    }
+
+    {
+        if (!!moduleInformation.tableInformation && moduleInformation.tableInformation.isImport()) {
+            // We should either have a Table import or we should have thrown an exception.
+            RELEASE_ASSERT(hasTableImport);
+        }
+
+        if (!!moduleInformation.tableInformation && !hasTableImport) {
+            RELEASE_ASSERT(!moduleInformation.tableInformation.isImport());
+            // We create a Table when it's a Table definition.
+            JSWebAssemblyTable* table = JSWebAssemblyTable::create(exec, vm, exec->lexicalGlobalObject()->WebAssemblyTableStructure(),
+                moduleInformation.tableInformation.initial(), moduleInformation.tableInformation.maximum());
+            // We should always be able to allocate a JSWebAssemblyTable we've defined.
+            // If it's defined to be too large, we should have thrown a validation error.
+            ASSERT(!throwScope.exception());
+            ASSERT(table); 
+            instance->setTable(vm, table);
+        }
+    }
+
+    // Globals
+    {
+        ASSERT(numImportGlobals == moduleInformation.firstInternalGlobal);
+        for (size_t globalIndex = numImportGlobals; globalIndex < moduleInformation.globals.size(); ++globalIndex) {
+            const auto& global = moduleInformation.globals[globalIndex];
+            ASSERT(global.initializationType != Wasm::Global::IsImport);
+            if (global.initializationType == Wasm::Global::FromGlobalImport) {
+                ASSERT(global.initialBitsOrImportNumber < numImportGlobals);
+                instance->setGlobal(globalIndex, instance->loadI64Global(global.initialBitsOrImportNumber));
+            } else
+                instance->setGlobal(globalIndex, global.initialBitsOrImportNumber);
+        }
+    }
+
+    moduleRecord->link(exec, instance);
+    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+
+    if (verbose)
+        moduleRecord->dump();
+    JSValue startResult = moduleRecord->evaluate(exec);
+    UNUSED_PARAM(startResult);
+    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
+
+    return JSValue::encode(instance);
+}
+
+static EncodedJSValue JSC_HOST_CALL callJSWebAssemblyInstance(ExecState* state)
+{
+    VM& vm = state->vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+    return JSValue::encode(throwConstructorCannotBeCalledAsFunctionTypeError(state, scope, "WebAssembly.Instance"));
+}
+
+WebAssemblyInstanceConstructor* WebAssemblyInstanceConstructor::create(VM& vm, Structure* structure, WebAssemblyInstancePrototype* thisPrototype)
+{
+    auto* constructor = new (NotNull, allocateCell<WebAssemblyInstanceConstructor>(vm.heap)) WebAssemblyInstanceConstructor(vm, structure);
+    constructor->finishCreation(vm, thisPrototype);
+    return constructor;
+}
+
+Structure* WebAssemblyInstanceConstructor::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
+{
+    return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
+}
+
+void WebAssemblyInstanceConstructor::finishCreation(VM& vm, WebAssemblyInstancePrototype* prototype)
+{
+    Base::finishCreation(vm, ASCIILiteral("Instance"));
+    putDirectWithoutTransition(vm, vm.propertyNames->prototype, prototype, DontEnum | DontDelete | ReadOnly);
+    putDirectWithoutTransition(vm, vm.propertyNames->length, jsNumber(1), ReadOnly | DontEnum | DontDelete);
+}
+
+WebAssemblyInstanceConstructor::WebAssemblyInstanceConstructor(VM& vm, Structure* structure)
+    : Base(vm, structure)
+{
+}
+
+ConstructType WebAssemblyInstanceConstructor::getConstructData(JSCell*, ConstructData& constructData)
+{
+    constructData.native.function = constructJSWebAssemblyInstance;
+    return ConstructType::Host;
+}
+
+CallType WebAssemblyInstanceConstructor::getCallData(JSCell*, CallData& callData)
+{
+    callData.native.function = callJSWebAssemblyInstance;
+    return CallType::Host;
+}
+
+void WebAssemblyInstanceConstructor::visitChildren(JSCell* cell, SlotVisitor& visitor)
+{
+    auto* thisObject = jsCast<WebAssemblyInstanceConstructor*>(cell);
+    ASSERT_GC_OBJECT_INHERITS(thisObject, info());
+    Base::visitChildren(thisObject, visitor);
+}
+
+} // namespace JSC
+
+#endif // ENABLE(WEBASSEMBLY)
+