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