SymbolTable* SymbolTable::clone(VM& vm)
{
SymbolTable* result = SymbolTable::create(vm);
result->m_parameterCountIncludingThis = m_parameterCountIncludingThis;
result->m_usesNonStrictEval = m_usesNonStrictEval;
result->m_captureStart = m_captureStart;
result->m_captureEnd = m_captureEnd;
Map::iterator iter = m_map.begin();
Map::iterator end = m_map.end();
for (; iter != end; ++iter) {
result->m_map.add(
iter->key,
SymbolTableEntry(iter->value.getIndex(), iter->value.getAttributes()));
}
if (m_slowArguments) {
result->m_slowArguments = std::make_unique<SlowArgument[]>(parameterCount());
for (unsigned i = parameterCount(); i--;)
result->m_slowArguments[i] = m_slowArguments[i];
}
return 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;
}
SymbolTable* SymbolTable::cloneCapturedNames(VM& vm)
{
SymbolTable* result = SymbolTable::create(vm);
result->m_parameterCountIncludingThis = m_parameterCountIncludingThis;
result->m_usesNonStrictEval = m_usesNonStrictEval;
result->m_captureStart = m_captureStart;
result->m_captureEnd = m_captureEnd;
for (auto iter = m_map.begin(), end = m_map.end(); iter != end; ++iter) {
if (!isCaptured(iter->value.getIndex()))
continue;
result->m_map.add(
iter->key,
SymbolTableEntry(iter->value.getIndex(), iter->value.getAttributes()));
}
if (m_slowArguments) {
result->m_slowArguments = std::make_unique<SlowArgument[]>(parameterCount());
for (unsigned i = parameterCount(); i--;)
result->m_slowArguments[i] = m_slowArguments[i];
}
if (m_uniqueIDMap && result->m_uniqueIDMap) {
{
auto iter = m_uniqueIDMap->begin();
auto end = m_uniqueIDMap->end();
for (; iter != end; ++iter)
result->m_uniqueIDMap->set(iter->key, iter->value);
}
{
auto iter = m_registerToVariableMap->begin();
auto end = m_registerToVariableMap->end();
for (; iter != end; ++iter)
result->m_registerToVariableMap->set(iter->key, iter->value);
}
{
auto iter = m_uniqueTypeSetMap->begin();
auto end = m_uniqueTypeSetMap->end();
for (; iter != end; ++iter)
result->m_uniqueTypeSetMap->set(iter->key, iter->value);
}
}
return result;
}
SymbolTable* SymbolTable::cloneScopePart(VM& vm)
{
SymbolTable* result = SymbolTable::create(vm);
result->m_usesNonStrictEval = m_usesNonStrictEval;
result->m_nestedLexicalScope = m_nestedLexicalScope;
result->m_scopeType = m_scopeType;
for (auto iter = m_map.begin(), end = m_map.end(); iter != end; ++iter) {
if (!iter->value.varOffset().isScope())
continue;
result->m_map.add(
iter->key,
SymbolTableEntry(iter->value.varOffset(), iter->value.getAttributes()));
}
result->m_maxScopeOffset = m_maxScopeOffset;
if (ScopedArgumentsTable* arguments = this->arguments())
result->m_arguments.set(vm, result, arguments);
if (m_typeProfilingRareData) {
result->m_typeProfilingRareData = std::make_unique<TypeProfilingRareData>();
{
auto iter = m_typeProfilingRareData->m_uniqueIDMap.begin();
auto end = m_typeProfilingRareData->m_uniqueIDMap.end();
for (; iter != end; ++iter)
result->m_typeProfilingRareData->m_uniqueIDMap.set(iter->key, iter->value);
}
{
auto iter = m_typeProfilingRareData->m_offsetToVariableMap.begin();
auto end = m_typeProfilingRareData->m_offsetToVariableMap.end();
for (; iter != end; ++iter)
result->m_typeProfilingRareData->m_offsetToVariableMap.set(iter->key, iter->value);
}
{
auto iter = m_typeProfilingRareData->m_uniqueTypeSetMap.begin();
auto end = m_typeProfilingRareData->m_uniqueTypeSetMap.end();
for (; iter != end; ++iter)
result->m_typeProfilingRareData->m_uniqueTypeSetMap.set(iter->key, iter->value);
}
}
return result;
}
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);
}
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;
}