// Copyright 2014 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/arguments-inl.h"
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#include "src/heap/factory.h"
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#include "src/heap/heap-inl.h"
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#include "src/objects-inl.h"
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#include "src/objects/js-generator-inl.h"
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#include "src/runtime/runtime-utils.h"
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namespace v8 {
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namespace internal {
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RUNTIME_FUNCTION(Runtime_CreateJSGeneratorObject) {
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HandleScope scope(isolate);
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DCHECK_EQ(2, args.length());
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CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
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CONVERT_ARG_HANDLE_CHECKED(Object, receiver, 1);
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CHECK(IsResumableFunction(function->shared()->kind()));
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// Underlying function needs to have bytecode available.
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DCHECK(function->shared()->HasBytecodeArray());
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int size = function->shared()->internal_formal_parameter_count() +
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function->shared()->GetBytecodeArray()->register_count();
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Handle<FixedArray> parameters_and_registers =
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isolate->factory()->NewFixedArray(size);
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Handle<JSGeneratorObject> generator =
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isolate->factory()->NewJSGeneratorObject(function);
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generator->set_function(*function);
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generator->set_context(isolate->context());
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generator->set_receiver(*receiver);
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generator->set_parameters_and_registers(*parameters_and_registers);
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generator->set_continuation(JSGeneratorObject::kGeneratorExecuting);
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if (generator->IsJSAsyncGeneratorObject()) {
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Handle<JSAsyncGeneratorObject>::cast(generator)->set_is_awaiting(0);
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}
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return *generator;
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}
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RUNTIME_FUNCTION(Runtime_GeneratorClose) {
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// Runtime call is implemented in InterpreterIntrinsics and lowered in
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// JSIntrinsicLowering
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UNREACHABLE();
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}
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RUNTIME_FUNCTION(Runtime_GeneratorGetFunction) {
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HandleScope scope(isolate);
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DCHECK_EQ(1, args.length());
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CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0);
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return generator->function();
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}
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RUNTIME_FUNCTION(Runtime_GeneratorGetInputOrDebugPos) {
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// Runtime call is implemented in InterpreterIntrinsics and lowered in
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// JSIntrinsicLowering
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UNREACHABLE();
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}
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RUNTIME_FUNCTION(Runtime_AsyncGeneratorResolve) {
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// Runtime call is implemented in InterpreterIntrinsics and lowered in
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// JSIntrinsicLowering
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UNREACHABLE();
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}
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RUNTIME_FUNCTION(Runtime_AsyncGeneratorReject) {
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// Runtime call is implemented in InterpreterIntrinsics and lowered in
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// JSIntrinsicLowering
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UNREACHABLE();
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}
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RUNTIME_FUNCTION(Runtime_AsyncGeneratorYield) {
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// Runtime call is implemented in InterpreterIntrinsics and lowered in
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// JSIntrinsicLowering
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UNREACHABLE();
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}
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RUNTIME_FUNCTION(Runtime_GeneratorGetResumeMode) {
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// Runtime call is implemented in InterpreterIntrinsics and lowered in
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// JSIntrinsicLowering
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UNREACHABLE();
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}
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// Return true if {generator}'s PC has a catch handler. This allows
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// catch prediction to happen from the AsyncGeneratorResumeNext stub.
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RUNTIME_FUNCTION(Runtime_AsyncGeneratorHasCatchHandlerForPC) {
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DisallowHeapAllocation no_allocation_scope;
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DCHECK_EQ(1, args.length());
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DCHECK(args[0]->IsJSAsyncGeneratorObject());
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JSAsyncGeneratorObject* generator = JSAsyncGeneratorObject::cast(args[0]);
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int state = generator->continuation();
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DCHECK_NE(state, JSAsyncGeneratorObject::kGeneratorExecuting);
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// If state is 0 ("suspendedStart"), there is guaranteed to be no catch
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// handler. Otherwise, if state is below 0, the generator is closed and will
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// not reach a catch handler.
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if (state < 1) return ReadOnlyRoots(isolate).false_value();
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SharedFunctionInfo* shared = generator->function()->shared();
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DCHECK(shared->HasBytecodeArray());
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HandlerTable handler_table(shared->GetBytecodeArray());
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int pc = Smi::cast(generator->input_or_debug_pos())->value();
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HandlerTable::CatchPrediction catch_prediction = HandlerTable::ASYNC_AWAIT;
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handler_table.LookupRange(pc, nullptr, &catch_prediction);
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return isolate->heap()->ToBoolean(catch_prediction == HandlerTable::CAUGHT);
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}
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} // namespace internal
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} // namespace v8
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