JSWebAssemblyInstance.cpp [plain text]
#include "config.h"
#include "JSWebAssemblyInstance.h"
#if ENABLE(WEBASSEMBLY)
#include "AbstractModuleRecord.h"
#include "JSCInlines.h"
#include "JSModuleEnvironment.h"
#include "JSModuleNamespaceObject.h"
#include "JSWebAssemblyHelpers.h"
#include "JSWebAssemblyLinkError.h"
#include "JSWebAssemblyMemory.h"
#include "JSWebAssemblyModule.h"
#include "WebAssemblyModuleRecord.h"
#include "WebAssemblyToJSCallee.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))
{
for (unsigned i = 0; i < this->instance().numImportFunctions(); ++i)
new (this->instance().importFunction<PoisonedBarrier<JSObject>>(i)) PoisonedBarrier<JSObject>();
}
void JSWebAssemblyInstance::finishCreation(VM& vm, JSWebAssemblyModule* module, JSModuleNamespaceObject* moduleNamespaceObject)
{
Base::finishCreation(vm);
ASSERT(inherits(vm, info()));
m_module.set(vm, this, module);
m_moduleNamespaceObject.set(vm, this, moduleNamespaceObject);
m_callee.set(vm, this, module->callee());
vm.heap.reportExtraMemoryAllocated(m_instance->extraMemoryAllocated());
}
void JSWebAssemblyInstance::destroy(JSCell* cell)
{
static_cast<JSWebAssemblyInstance*>(cell)->JSWebAssemblyInstance::~JSWebAssemblyInstance();
}
void JSWebAssemblyInstance::visitChildren(JSCell* cell, SlotVisitor& 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_codeBlock);
visitor.append(thisObject->m_moduleNamespaceObject);
visitor.append(thisObject->m_memory);
visitor.append(thisObject->m_table);
visitor.append(thisObject->m_callee);
visitor.reportExtraMemoryVisited(thisObject->m_instance->extraMemoryAllocated());
for (unsigned i = 0; i < thisObject->instance().numImportFunctions(); ++i)
visitor.append(*thisObject->instance().importFunction<PoisonedBarrier<JSObject>>(i)); }
void JSWebAssemblyInstance::finalizeCreation(VM& vm, ExecState* exec, Ref<Wasm::CodeBlock>&& wasmCodeBlock, JSObject* importObject, Wasm::CreationMode creationMode)
{
m_instance->finalizeCreation(this, wasmCodeBlock.copyRef());
auto scope = DECLARE_THROW_SCOPE(vm);
if (!wasmCodeBlock->runnable()) {
throwException(exec, scope, JSWebAssemblyLinkError::create(exec, vm, globalObject(vm)->WebAssemblyLinkErrorStructure(), wasmCodeBlock->errorMessage()));
return;
}
RELEASE_ASSERT(wasmCodeBlock->isSafeToRun(memoryMode()));
JSWebAssemblyCodeBlock* jsCodeBlock = m_module->codeBlock(memoryMode());
if (jsCodeBlock) {
ASSERT(&jsCodeBlock->codeBlock() == wasmCodeBlock.ptr());
m_codeBlock.set(vm, this, jsCodeBlock);
} else {
jsCodeBlock = JSWebAssemblyCodeBlock::create(vm, WTFMove(wasmCodeBlock), module()->module().moduleInformation());
if (UNLIKELY(!jsCodeBlock->runnable())) {
throwException(exec, scope, JSWebAssemblyLinkError::create(exec, vm, globalObject(vm)->WebAssemblyLinkErrorStructure(), jsCodeBlock->errorMessage()));
return;
}
m_codeBlock.set(vm, this, jsCodeBlock);
m_module->setCodeBlock(vm, memoryMode(), jsCodeBlock);
}
for (unsigned importFunctionNum = 0; importFunctionNum < instance().numImportFunctions(); ++importFunctionNum) {
auto* info = instance().importFunctionInfo(importFunctionNum);
info->wasmToEmbedderStub = m_codeBlock->wasmToEmbedderStub(importFunctionNum);
}
auto* moduleRecord = jsCast<WebAssemblyModuleRecord*>(m_moduleNamespaceObject->moduleRecord());
moduleRecord->prepareLink(vm, this);
if (creationMode == Wasm::CreationMode::FromJS) {
moduleRecord->link(exec, jsNull(), importObject, creationMode);
RETURN_IF_EXCEPTION(scope, void());
JSValue startResult = moduleRecord->evaluate(exec);
UNUSED_PARAM(startResult);
RETURN_IF_EXCEPTION(scope, void());
}
}
Identifier JSWebAssemblyInstance::createPrivateModuleKey()
{
return Identifier::fromUid(PrivateName(PrivateName::Description, "WebAssemblyInstance"));
}
JSWebAssemblyInstance* JSWebAssemblyInstance::create(VM& vm, ExecState* exec, const Identifier& moduleKey, JSWebAssemblyModule* jsModule, JSObject* importObject, Structure* instanceStructure, Ref<Wasm::Module>&& module, Wasm::CreationMode creationMode)
{
auto throwScope = DECLARE_THROW_SCOPE(vm);
auto* globalObject = exec->lexicalGlobalObject();
const Wasm::ModuleInformation& moduleInformation = jsModule->moduleInformation();
auto exception = [&] (JSObject* error) {
throwException(exec, throwScope, error);
return nullptr;
};
if (!globalObject->webAssemblyEnabled())
return exception(createEvalError(exec, globalObject->webAssemblyDisabledErrorMessage()));
auto importFailMessage = [&] (const Wasm::Import& import, const char* before, const char* after) {
return makeString(before, " ", String::fromUTF8(import.module), ":", String::fromUTF8(import.field), " ", after);
};
WebAssemblyModuleRecord* moduleRecord = WebAssemblyModuleRecord::create(exec, vm, globalObject->webAssemblyModuleRecordStructure(), moduleKey, moduleInformation);
RETURN_IF_EXCEPTION(throwScope, nullptr);
JSModuleNamespaceObject* moduleNamespace = moduleRecord->getModuleNamespace(exec);
auto storeTopCallFrame = [&vm] (void* topCallFrame) {
vm.topCallFrame = bitwise_cast<ExecState*>(topCallFrame);
};
auto* jsInstance = new (NotNull, allocateCell<JSWebAssemblyInstance>(vm.heap)) JSWebAssemblyInstance(vm, instanceStructure,
Wasm::Instance::create(&vm.wasmContext, WTFMove(module), &vm.topEntryFrame, vm.addressOfSoftStackLimit(), WTFMove(storeTopCallFrame)));
jsInstance->finishCreation(vm, jsModule, moduleNamespace);
RETURN_IF_EXCEPTION(throwScope, nullptr);
bool hasMemoryImport = false;
if (creationMode == Wasm::CreationMode::FromJS) {
if (moduleInformation.imports.size() && !importObject)
return exception(createTypeError(exec, "can't make WebAssembly.Instance because there is no imports Object and the WebAssembly.Module requires imports"_s));
}
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")),
});
switch (import.kind) {
case Wasm::ExternalKind::Function:
case Wasm::ExternalKind::Global:
case Wasm::ExternalKind::Table:
continue;
case Wasm::ExternalKind::Memory:
break;
}
JSValue value;
if (creationMode == Wasm::CreationMode::FromJS) {
JSValue importModuleValue = importObject->get(exec, moduleName);
RETURN_IF_EXCEPTION(throwScope, nullptr);
if (!importModuleValue.isObject())
return exception(createTypeError(exec, importFailMessage(import, "import", "must be an object"), defaultSourceAppender, runtimeTypeForValue(vm, importModuleValue)));
JSObject* object = jsCast<JSObject*>(importModuleValue);
value = object->get(exec, fieldName);
RETURN_IF_EXCEPTION(throwScope, nullptr);
}
if (!value)
value = jsUndefined();
switch (import.kind) {
case Wasm::ExternalKind::Function:
case Wasm::ExternalKind::Global:
case Wasm::ExternalKind::Table:
break;
case Wasm::ExternalKind::Memory: {
RELEASE_ASSERT(!hasMemoryImport); RELEASE_ASSERT(moduleInformation.memory);
hasMemoryImport = true;
JSWebAssemblyMemory* memory = jsDynamicCast<JSWebAssemblyMemory*>(vm, value);
if (!memory)
return exception(createJSWebAssemblyLinkError(exec, vm, importFailMessage(import, "Memory import", "is not an instance of WebAssembly.Memory")));
Wasm::PageCount declaredInitial = moduleInformation.memory.initial();
Wasm::PageCount importedInitial = memory->memory().initial();
if (importedInitial < declaredInitial)
return exception(createJSWebAssemblyLinkError(exec, vm, importFailMessage(import, "Memory import", "provided an 'initial' that is smaller than the module's declared 'initial' import memory size")));
if (Wasm::PageCount declaredMaximum = moduleInformation.memory.maximum()) {
Wasm::PageCount importedMaximum = memory->memory().maximum();
if (!importedMaximum)
return exception(createJSWebAssemblyLinkError(exec, vm, importFailMessage(import, "Memory import", "did not have a 'maximum' but the module requires that it does")));
if (importedMaximum > declaredMaximum)
return exception(createJSWebAssemblyLinkError(exec, vm, importFailMessage(import, "Memory import", "provided a 'maximum' that is larger than the module's declared 'maximum' import memory size")));
}
jsInstance->setMemory(vm, memory);
RETURN_IF_EXCEPTION(throwScope, nullptr);
break;
}
}
}
ASSERT(moduleRecord->importEntries().size() == moduleInformation.imports.size());
{
if (!!moduleInformation.memory && moduleInformation.memory.isImport()) {
RELEASE_ASSERT(hasMemoryImport);
}
if (moduleInformation.memory && !hasMemoryImport) {
RELEASE_ASSERT(!moduleInformation.memory.isImport());
auto* jsMemory = JSWebAssemblyMemory::create(exec, vm, globalObject->WebAssemblyMemoryStructure());
RETURN_IF_EXCEPTION(throwScope, nullptr);
RefPtr<Wasm::Memory> memory = Wasm::Memory::tryCreate(moduleInformation.memory.initial(), moduleInformation.memory.maximum(),
[&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(exec));
jsMemory->adopt(memory.releaseNonNull());
jsInstance->setMemory(vm, jsMemory);
RETURN_IF_EXCEPTION(throwScope, nullptr);
}
}
if (!jsInstance->memory()) {
auto* jsMemory = JSWebAssemblyMemory::create(exec, vm, globalObject->WebAssemblyMemoryStructure());
jsMemory->adopt(Wasm::Memory::create());
jsInstance->setMemory(vm, jsMemory);
RETURN_IF_EXCEPTION(throwScope, nullptr);
}
return jsInstance;
}
}
#endif // ENABLE(WEBASSEMBLY)