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// Copyright 2019 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/execution/thread-local-top.h"
#include "src/execution/isolate.h"
#include "src/execution/simulator.h"
#include "src/trap-handler/trap-handler.h"
namespace v8 {
namespace internal {
void ThreadLocalTop::Clear() {
try_catch_handler_ = nullptr;
isolate_ = nullptr;
context_ = Context();
thread_id_ = ThreadId();
pending_handler_entrypoint_ = kNullAddress;
pending_handler_constant_pool_ = kNullAddress;
pending_handler_fp_ = kNullAddress;
pending_handler_sp_ = kNullAddress;
num_frames_above_pending_handler_ = 0;
last_api_entry_ = kNullAddress;
pending_message_ = Object();
rethrowing_message_ = false;
external_caught_exception_ = false;
c_entry_fp_ = kNullAddress;
handler_ = kNullAddress;
c_function_ = kNullAddress;
promise_on_stack_ = nullptr;
simulator_ = nullptr;
js_entry_sp_ = kNullAddress;
external_callback_scope_ = nullptr;
current_vm_state_ = EXTERNAL;
current_embedder_state_ = nullptr;
failed_access_check_callback_ = nullptr;
thread_in_wasm_flag_address_ = kNullAddress;
#ifdef V8_ENABLE_CONSERVATIVE_STACK_SCANNING
stack_ = ::heap::base::Stack(nullptr);
#endif
}
void ThreadLocalTop::Initialize(Isolate* isolate) {
Clear();
isolate_ = isolate;
thread_id_ = ThreadId::Current();
#if V8_ENABLE_WEBASSEMBLY
thread_in_wasm_flag_address_ = reinterpret_cast<Address>(
trap_handler::GetThreadInWasmThreadLocalAddress());
#endif // V8_ENABLE_WEBASSEMBLY
#ifdef USE_SIMULATOR
simulator_ = Simulator::current(isolate);
#endif
#ifdef V8_ENABLE_CONSERVATIVE_STACK_SCANNING
stack_ = ::heap::base::Stack(base::Stack::GetStackStart());
#endif
}
void ThreadLocalTop::Free() {
// Match unmatched PopPromise calls.
while (promise_on_stack_) isolate_->PopPromise();
}
#if defined(USE_SIMULATOR)
void ThreadLocalTop::StoreCurrentStackPosition() {
last_api_entry_ = simulator_->get_sp();
}
#elif defined(V8_USE_ADDRESS_SANITIZER)
void ThreadLocalTop::StoreCurrentStackPosition() {
last_api_entry_ = reinterpret_cast<Address>(GetCurrentStackPosition());
}
#endif
} // namespace internal
} // namespace v8
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