JSObject* ProgramExecutable::initializeGlobalProperties(VM& vm, CallFrame* callFrame, JSScope* scope)
{
auto throwScope = DECLARE_THROW_SCOPE(vm);
RELEASE_ASSERT(scope);
JSGlobalObject* globalObject = scope->globalObject();
RELEASE_ASSERT(globalObject);
ASSERT(&globalObject->vm() == &vm);
ParserError error;
JSParserStrictMode strictMode = isStrictMode() ? JSParserStrictMode::Strict : JSParserStrictMode::NotStrict;
DebuggerMode debuggerMode = globalObject->hasInteractiveDebugger() ? DebuggerOn : DebuggerOff;
UnlinkedProgramCodeBlock* unlinkedCodeBlock = vm.codeCache()->getUnlinkedProgramCodeBlock(
vm, this, source(), strictMode, debuggerMode, error);
if (globalObject->hasDebugger())
globalObject->debugger()->sourceParsed(callFrame, source().provider(), error.line(), error.message());
if (error.isValid())
return error.toErrorObject(globalObject, source());
JSValue nextPrototype = globalObject->getPrototypeDirect();
while (nextPrototype && nextPrototype.isObject()) {
if (UNLIKELY(asObject(nextPrototype)->type() == ProxyObjectType)) {
ExecState* exec = globalObject->globalExec();
return createTypeError(exec, ASCIILiteral("Proxy is not allowed in the global prototype chain."));
}
nextPrototype = asObject(nextPrototype)->getPrototypeDirect();
}
JSGlobalLexicalEnvironment* globalLexicalEnvironment = globalObject->globalLexicalEnvironment();
const VariableEnvironment& variableDeclarations = unlinkedCodeBlock->variableDeclarations();
const VariableEnvironment& lexicalDeclarations = unlinkedCodeBlock->lexicalDeclarations();
// The ES6 spec says that no vars/global properties/let/const can be duplicated in the global scope.
// This carried out section 15.1.8 of the ES6 spec: http://www.ecma-international.org/ecma-262/6.0/index.html#sec-globaldeclarationinstantiation
{
ExecState* exec = globalObject->globalExec();
// Check for intersection of "var" and "let"/"const"/"class"
for (auto& entry : lexicalDeclarations) {
if (variableDeclarations.contains(entry.key))
return createSyntaxError(exec, makeString("Can't create duplicate variable: '", String(entry.key.get()), "'"));
}
// Check if any new "let"/"const"/"class" will shadow any pre-existing global property names, or "var"/"let"/"const" variables.
// It's an error to introduce a shadow.
for (auto& entry : lexicalDeclarations) {
bool hasProperty = globalObject->hasProperty(exec, entry.key.get());
RETURN_IF_EXCEPTION(throwScope, throwScope.exception());
if (hasProperty) {
// The ES6 spec says that just RestrictedGlobalProperty can't be shadowed
// This carried out section 8.1.1.4.14 of the ES6 spec: http://www.ecma-international.org/ecma-262/6.0/index.html#sec-hasrestrictedglobalproperty
PropertyDescriptor descriptor;
globalObject->getOwnPropertyDescriptor(exec, entry.key.get(), descriptor);
if (descriptor.value() != jsUndefined() && !descriptor.configurable())
return createSyntaxError(exec, makeString("Can't create duplicate variable that shadows a global property: '", String(entry.key.get()), "'"));
}
hasProperty = globalLexicalEnvironment->hasProperty(exec, entry.key.get());
RETURN_IF_EXCEPTION(throwScope, throwScope.exception());
if (hasProperty) {
if (UNLIKELY(entry.value.isConst() && !vm.globalConstRedeclarationShouldThrow() && !isStrictMode())) {
// We only allow "const" duplicate declarations under this setting.
// For example, we don't "let" variables to be overridden by "const" variables.
if (globalLexicalEnvironment->isConstVariable(entry.key.get()))
continue;
}
return createSyntaxError(exec, makeString("Can't create duplicate variable: '", String(entry.key.get()), "'"));
}
}
// Check if any new "var"s will shadow any previous "let"/"const"/"class" names.
// It's an error to introduce a shadow.
if (!globalLexicalEnvironment->isEmpty()) {
for (auto& entry : variableDeclarations) {
bool hasProperty = globalLexicalEnvironment->hasProperty(exec, entry.key.get());
RETURN_IF_EXCEPTION(throwScope, throwScope.exception());
if (hasProperty)
return createSyntaxError(exec, makeString("Can't create duplicate variable: '", String(entry.key.get()), "'"));
}
}
}
m_unlinkedProgramCodeBlock.set(vm, this, unlinkedCodeBlock);
BatchedTransitionOptimizer optimizer(vm, globalObject);
for (size_t i = 0, numberOfFunctions = unlinkedCodeBlock->numberOfFunctionDecls(); i < numberOfFunctions; ++i) {
UnlinkedFunctionExecutable* unlinkedFunctionExecutable = unlinkedCodeBlock->functionDecl(i);
ASSERT(!unlinkedFunctionExecutable->name().isEmpty());
globalObject->addFunction(callFrame, unlinkedFunctionExecutable->name());
if (vm.typeProfiler() || vm.controlFlowProfiler()) {
vm.functionHasExecutedCache()->insertUnexecutedRange(sourceID(),
unlinkedFunctionExecutable->typeProfilingStartOffset(),
unlinkedFunctionExecutable->typeProfilingEndOffset());
}
}
for (auto& entry : variableDeclarations) {
ASSERT(entry.value.isVar());
globalObject->addVar(callFrame, Identifier::fromUid(&vm, entry.key.get()));
ASSERT(!throwScope.exception());
}
{
JSGlobalLexicalEnvironment* globalLexicalEnvironment = jsCast<JSGlobalLexicalEnvironment*>(globalObject->globalScope());
SymbolTable* symbolTable = globalLexicalEnvironment->symbolTable();
ConcurrentJSLocker locker(symbolTable->m_lock);
for (auto& entry : lexicalDeclarations) {
if (UNLIKELY(entry.value.isConst() && !vm.globalConstRedeclarationShouldThrow() && !isStrictMode())) {
if (symbolTable->contains(locker, entry.key.get()))
continue;
}
ScopeOffset offset = symbolTable->takeNextScopeOffset(locker);
SymbolTableEntry newEntry(VarOffset(offset), entry.value.isConst() ? ReadOnly : 0);
newEntry.prepareToWatch();
symbolTable->add(locker, entry.key.get(), newEntry);
ScopeOffset offsetForAssert = globalLexicalEnvironment->addVariables(1, jsTDZValue());
RELEASE_ASSERT(offsetForAssert == offset);
}
}
return nullptr;
}
JSValue WebAssemblyModuleConstructor::createModule(ExecState* state, Structure* structure)
{
VM& vm = state->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
size_t byteOffset;
size_t byteSize;
uint8_t* base = getWasmBufferFromValue(state, state->argument(0), byteOffset, byteSize);
RETURN_IF_EXCEPTION(scope, { });
Wasm::Plan plan(&vm, base + byteOffset, byteSize);
// On failure, a new WebAssembly.CompileError is thrown.
plan.run();
if (plan.failed())
return throwException(state, scope, createJSWebAssemblyCompileError(state, vm, plan.errorMessage()));
// On success, a new WebAssembly.Module object is returned with [[Module]] set to the validated Ast.module.
// The export symbol table is the same for all Instances of a Module.
SymbolTable* exportSymbolTable = SymbolTable::create(vm);
for (auto& exp : plan.exports()) {
auto offset = exportSymbolTable->takeNextScopeOffset(NoLockingNecessary);
exportSymbolTable->set(NoLockingNecessary, exp.field.impl(), SymbolTableEntry(VarOffset(offset)));
}
// Only wasm-internal functions have a callee, stubs to JS do not.
unsigned calleeCount = plan.internalFunctionCount();
JSWebAssemblyModule* result = JSWebAssemblyModule::create(vm, structure, plan.takeModuleInformation(), plan.takeCallLinkInfos(), plan.takeWasmExitStubs(), exportSymbolTable, calleeCount);
plan.initializeCallees(state->jsCallee()->globalObject(),
[&] (unsigned calleeIndex, JSWebAssemblyCallee* jsEntrypointCallee, JSWebAssemblyCallee* wasmEntrypointCallee) {
result->setJSEntrypointCallee(vm, calleeIndex, jsEntrypointCallee);
result->setWasmEntrypointCallee(vm, calleeIndex, wasmEntrypointCallee);
});
return result;
}
JSObject* ProgramExecutable::initializeGlobalProperties(VM& vm, CallFrame* callFrame, JSScope* scope)
{
RELEASE_ASSERT(scope);
JSGlobalObject* globalObject = scope->globalObject();
RELEASE_ASSERT(globalObject);
ASSERT(&globalObject->vm() == &vm);
JSObject* exception = 0;
UnlinkedProgramCodeBlock* unlinkedCodeBlock = globalObject->createProgramCodeBlock(callFrame, this, &exception);
if (exception)
return exception;
JSGlobalLexicalEnvironment* globalLexicalEnvironment = globalObject->globalLexicalEnvironment();
const VariableEnvironment& variableDeclarations = unlinkedCodeBlock->variableDeclarations();
const VariableEnvironment& lexicalDeclarations = unlinkedCodeBlock->lexicalDeclarations();
// The ES6 spec says that no vars/global properties/let/const can be duplicated in the global scope.
// This carried out section 15.1.8 of the ES6 spec: http://www.ecma-international.org/ecma-262/6.0/index.html#sec-globaldeclarationinstantiation
{
ExecState* exec = globalObject->globalExec();
// Check for intersection of "var" and "let"/"const"/"class"
for (auto& entry : lexicalDeclarations) {
if (variableDeclarations.contains(entry.key))
return createSyntaxError(exec, makeString("Can't create duplicate variable: '", String(entry.key.get()), "'"));
}
// Check if any new "let"/"const"/"class" will shadow any pre-existing global property names, or "var"/"let"/"const" variables.
// It's an error to introduce a shadow.
for (auto& entry : lexicalDeclarations) {
if (globalObject->hasProperty(exec, entry.key.get()))
return createSyntaxError(exec, makeString("Can't create duplicate variable that shadows a global property: '", String(entry.key.get()), "'"));
if (globalLexicalEnvironment->hasProperty(exec, entry.key.get()))
return createSyntaxError(exec, makeString("Can't create duplicate variable: '", String(entry.key.get()), "'"));
}
// Check if any new "var"s will shadow any previous "let"/"const"/"class" names.
// It's an error to introduce a shadow.
if (!globalLexicalEnvironment->isEmpty()) {
for (auto& entry : variableDeclarations) {
if (globalLexicalEnvironment->hasProperty(exec, entry.key.get()))
return createSyntaxError(exec, makeString("Can't create duplicate variable: '", String(entry.key.get()), "'"));
}
}
}
m_unlinkedProgramCodeBlock.set(vm, this, unlinkedCodeBlock);
BatchedTransitionOptimizer optimizer(vm, globalObject);
for (size_t i = 0, numberOfFunctions = unlinkedCodeBlock->numberOfFunctionDecls(); i < numberOfFunctions; ++i) {
UnlinkedFunctionExecutable* unlinkedFunctionExecutable = unlinkedCodeBlock->functionDecl(i);
ASSERT(!unlinkedFunctionExecutable->name().isEmpty());
globalObject->addFunction(callFrame, unlinkedFunctionExecutable->name());
if (vm.typeProfiler() || vm.controlFlowProfiler()) {
vm.functionHasExecutedCache()->insertUnexecutedRange(sourceID(),
unlinkedFunctionExecutable->typeProfilingStartOffset(),
unlinkedFunctionExecutable->typeProfilingEndOffset());
}
}
for (auto& entry : variableDeclarations) {
ASSERT(entry.value.isVar());
globalObject->addVar(callFrame, Identifier::fromUid(&vm, entry.key.get()));
}
{
JSGlobalLexicalEnvironment* globalLexicalEnvironment = jsCast<JSGlobalLexicalEnvironment*>(globalObject->globalScope());
SymbolTable* symbolTable = globalLexicalEnvironment->symbolTable();
ConcurrentJITLocker locker(symbolTable->m_lock);
for (auto& entry : lexicalDeclarations) {
ScopeOffset offset = symbolTable->takeNextScopeOffset(locker);
SymbolTableEntry newEntry(VarOffset(offset), entry.value.isConst() ? ReadOnly : 0);
newEntry.prepareToWatch();
symbolTable->add(locker, entry.key.get(), newEntry);
ScopeOffset offsetForAssert = globalLexicalEnvironment->addVariables(1, jsTDZValue());
RELEASE_ASSERT(offsetForAssert == offset);
}
}
return 0;
}
static EncodedJSValue JSC_HOST_CALL constructJSWebAssemblyModule(ExecState* state)
{
VM& vm = state->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue val = state->argument(0);
// If the given bytes argument is not a BufferSource, a TypeError exception is thrown.
JSArrayBuffer* arrayBuffer = val.getObject() ? jsDynamicCast<JSArrayBuffer*>(val.getObject()) : nullptr;
JSArrayBufferView* arrayBufferView = val.getObject() ? jsDynamicCast<JSArrayBufferView*>(val.getObject()) : nullptr;
if (!(arrayBuffer || arrayBufferView))
return JSValue::encode(throwException(state, scope, createTypeError(state, ASCIILiteral("first argument to WebAssembly.Module must be an ArrayBufferView or an ArrayBuffer"), defaultSourceAppender, runtimeTypeForValue(val))));
if (arrayBufferView ? arrayBufferView->isNeutered() : arrayBuffer->impl()->isNeutered())
return JSValue::encode(throwException(state, scope, createTypeError(state, ASCIILiteral("underlying TypedArray has been detatched from the ArrayBuffer"), defaultSourceAppender, runtimeTypeForValue(val))));
size_t byteOffset = arrayBufferView ? arrayBufferView->byteOffset() : 0;
size_t byteSize = arrayBufferView ? arrayBufferView->length() : arrayBuffer->impl()->byteLength();
const auto* base = arrayBufferView ? static_cast<uint8_t*>(arrayBufferView->vector()) : static_cast<uint8_t*>(arrayBuffer->impl()->data());
Wasm::Plan plan(&vm, base + byteOffset, byteSize);
// On failure, a new WebAssembly.CompileError is thrown.
plan.run();
if (plan.failed())
return JSValue::encode(throwException(state, scope, createWebAssemblyCompileError(state, plan.errorMessage())));
// On success, a new WebAssembly.Module object is returned with [[Module]] set to the validated Ast.module.
auto* structure = InternalFunction::createSubclassStructure(state, state->newTarget(), asInternalFunction(state->jsCallee())->globalObject()->WebAssemblyModuleStructure());
RETURN_IF_EXCEPTION(scope, { });
// The export symbol table is the same for all Instances of a Module.
SymbolTable* exportSymbolTable = SymbolTable::create(vm);
for (auto& exp : plan.exports()) {
auto offset = exportSymbolTable->takeNextScopeOffset(NoLockingNecessary);
exportSymbolTable->set(NoLockingNecessary, exp.field.impl(), SymbolTableEntry(VarOffset(offset)));
}
// Only wasm-internal functions have a callee, stubs to JS do not.
unsigned calleeCount = plan.internalFunctionCount();
JSWebAssemblyModule* result = JSWebAssemblyModule::create(vm, structure, plan.takeModuleInformation(), plan.takeCallLinkInfos(), plan.takeWasmToJSStubs(), plan.takeFunctionIndexSpace(), exportSymbolTable, calleeCount);
plan.initializeCallees(state->jsCallee()->globalObject(),
[&] (unsigned calleeIndex, JSWebAssemblyCallee* jsEntrypointCallee, JSWebAssemblyCallee* wasmEntrypointCallee) {
result->setJSEntrypointCallee(vm, calleeIndex, jsEntrypointCallee);
result->setWasmEntrypointCallee(vm, calleeIndex, wasmEntrypointCallee);
});
return JSValue::encode(result);
}
Storage storageForGeneratorLocal(unsigned index)
{
// We assign a symbol to a register. There is one-on-one corresponding between a register and a symbol.
// By doing so, we allocate the specific storage to save the given register.
// This allow us not to save all the live registers even if the registers are not overwritten from the previous resuming time.
// It means that, the register can be retrieved even if the immediate previous op_save does not save it.
if (m_storages.size() <= index)
m_storages.resize(index + 1);
if (Optional<Storage> storage = m_storages[index])
return *storage;
Identifier identifier = Identifier::fromUid(PrivateName());
unsigned identifierIndex = m_codeBlock->numberOfIdentifiers();
m_codeBlock->addIdentifier(identifier);
ScopeOffset scopeOffset = m_generatorFrameSymbolTable->takeNextScopeOffset(NoLockingNecessary);
m_generatorFrameSymbolTable->set(NoLockingNecessary, identifier.impl(), SymbolTableEntry(VarOffset(scopeOffset)));
Storage storage = {
identifier,
identifierIndex,
scopeOffset
};
m_storages[index] = storage;
return storage;
}