static EncodedJSValue JSC_HOST_CALL webAssemblyTableProtoFuncSet(ExecState* exec)
{
VM& vm = exec->vm();
auto throwScope = DECLARE_THROW_SCOPE(vm);
JSWebAssemblyTable* table = getTable(exec, vm, exec->thisValue());
RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
JSValue value = exec->argument(1);
WebAssemblyFunction* wasmFunction;
WebAssemblyWrapperFunction* wasmWrapperFunction;
if (!value.isNull() && !isWebAssemblyHostFunction(vm, value, wasmFunction, wasmWrapperFunction))
return JSValue::encode(throwException(exec, throwScope, createTypeError(exec, "WebAssembly.Table.prototype.set expects the second argument to be null or an instance of WebAssembly.Function"_s)));
uint32_t index = toNonWrappingUint32(exec, exec->argument(0));
RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
if (index >= table->length())
return JSValue::encode(throwException(exec, throwScope, createRangeError(exec, "WebAssembly.Table.prototype.set expects an integer less than the length of the table"_s)));
if (value.isNull())
table->clearFunction(index);
else {
ASSERT(value.isObject() && isWebAssemblyHostFunction(vm, jsCast<JSObject*>(value), wasmFunction, wasmWrapperFunction));
ASSERT(!!wasmFunction || !!wasmWrapperFunction);
if (wasmFunction)
table->setFunction(vm, index, wasmFunction);
else
table->setFunction(vm, index, wasmWrapperFunction);
}
return JSValue::encode(jsUndefined());
}
static EncodedJSValue JSC_HOST_CALL webAssemblyTableProtoFuncLength(ExecState* exec)
{
VM& vm = exec->vm();
auto throwScope = DECLARE_THROW_SCOPE(vm);
JSWebAssemblyTable* table = getTable(exec, vm, exec->thisValue());
RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
return JSValue::encode(jsNumber(table->length()));
}
static EncodedJSValue JSC_HOST_CALL webAssemblyTableProtoFuncGet(ExecState* exec)
{
VM& vm = exec->vm();
auto throwScope = DECLARE_THROW_SCOPE(vm);
JSWebAssemblyTable* table = getTable(exec, vm, exec->thisValue());
RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
uint32_t index = toNonWrappingUint32(exec, exec->argument(0));
RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
if (index >= table->length())
return JSValue::encode(throwException(exec, throwScope, createRangeError(exec, "WebAssembly.Table.prototype.get expects an integer less than the length of the table"_s)));
if (JSObject* result = table->getFunction(index))
return JSValue::encode(result);
return JSValue::encode(jsNull());
}
static EncodedJSValue JSC_HOST_CALL webAssemblyTableProtoFuncGrow(ExecState* exec)
{
VM& vm = exec->vm();
auto throwScope = DECLARE_THROW_SCOPE(vm);
JSWebAssemblyTable* table = getTable(exec, vm, exec->thisValue());
RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
uint32_t delta = toNonWrappingUint32(exec, exec->argument(0));
RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
uint32_t oldLength = table->length();
if (!table->grow(delta))
return JSValue::encode(throwException(exec, throwScope, createRangeError(exec, "WebAssembly.Table.prototype.grow could not grow the table"_s)));
return JSValue::encode(jsNumber(oldLength));
}
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);
}
JSValue WebAssemblyModuleRecord::evaluate(ExecState* state)
{
VM& vm = state->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
{
JSWebAssemblyModule* module = m_instance->module();
const Wasm::ModuleInformation& moduleInformation = module->moduleInformation();
JSWebAssemblyTable* table = m_instance->table();
for (const Wasm::Element& element : moduleInformation.elements) {
// It should be a validation error to have any elements without a table.
// Also, it could be that a table wasn't imported, or that the table
// imported wasn't compatible. However, those should error out before
// getting here.
ASSERT(!!table);
if (!element.functionIndices.size())
continue;
uint32_t tableIndex = element.offset;
uint64_t lastWrittenIndex = static_cast<uint64_t>(tableIndex) + static_cast<uint64_t>(element.functionIndices.size()) - 1;
if (lastWrittenIndex >= table->size())
return throwException(state, scope, createJSWebAssemblyLinkError(state, vm, ASCIILiteral("Element is trying to set an out of bounds table index")));
for (uint32_t i = 0; i < element.functionIndices.size(); ++i) {
// FIXME: This essentially means we're exporting an import.
// We need a story here. We need to create a WebAssemblyFunction
// for the import.
// https://bugs.webkit.org/show_bug.cgi?id=165510
uint32_t functionIndex = element.functionIndices[i];
if (functionIndex < module->functionImportCount()) {
return JSValue::decode(
throwVMRangeError(state, scope, ASCIILiteral("Element is setting the table value with an import. This is not yet implemented. FIXME.")));
}
JSWebAssemblyCallee* jsEntrypointCallee = module->jsEntrypointCalleeFromFunctionIndexSpace(functionIndex);
JSWebAssemblyCallee* wasmEntrypointCallee = module->wasmEntrypointCalleeFromFunctionIndexSpace(functionIndex);
Wasm::SignatureIndex signatureIndex = module->signatureIndexFromFunctionIndexSpace(functionIndex);
const Wasm::Signature* signature = Wasm::SignatureInformation::get(&vm, signatureIndex);
// FIXME: Say we export local function "foo" at funciton index 0.
// What if we also set it to the table an Element w/ index 0.
// Does (new Instance(...)).exports.foo === table.get(0)?
// https://bugs.webkit.org/show_bug.cgi?id=165825
WebAssemblyFunction* function = WebAssemblyFunction::create(
vm, m_instance->globalObject(), signature->argumentCount(), String(), m_instance.get(), jsEntrypointCallee, wasmEntrypointCallee, signatureIndex);
table->setFunction(vm, tableIndex, function);
++tableIndex;
}
}
}
{
const Vector<Wasm::Segment::Ptr>& data = m_instance->module()->moduleInformation().data;
JSWebAssemblyMemory* jsMemory = m_instance->memory();
if (!data.isEmpty()) {
uint8_t* memory = reinterpret_cast<uint8_t*>(jsMemory->memory()->memory());
uint64_t sizeInBytes = jsMemory->memory()->size();
for (auto& segment : data) {
if (segment->sizeInBytes) {
uint32_t offset;
if (segment->offset.isGlobalImport())
offset = static_cast<uint32_t>(m_instance->loadI32Global(segment->offset.globalImportIndex()));
else
offset = segment->offset.constValue();
if (UNLIKELY(sizeInBytes < segment->sizeInBytes))
return dataSegmentFail(state, vm, scope, sizeInBytes, segment->sizeInBytes, offset, ASCIILiteral(", segment is too big"));
if (UNLIKELY(offset > sizeInBytes - segment->sizeInBytes))
return dataSegmentFail(state, vm, scope, sizeInBytes, segment->sizeInBytes, offset, ASCIILiteral(", segment writes outside of memory"));
RELEASE_ASSERT(memory);
memcpy(memory + offset, &segment->byte(0), segment->sizeInBytes);
}
}
}
}
if (JSCell* startFunction = m_startFunction.get()) {
CallData callData;
CallType callType = JSC::getCallData(startFunction, callData);
call(state, startFunction, callType, callData, jsUndefined(), state->emptyList());
RETURN_IF_EXCEPTION(scope, { });
}
return jsUndefined();
}
