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// Copyright 2016 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 "test/inspector/task-runner.h"
#include "include/v8-exception.h"
#include "include/v8-local-handle.h"
#include "include/v8-primitive.h"
#include "src/flags/flags.h"
#include "src/init/v8.h"
#include "src/libplatform/default-platform.h"
#include "src/utils/locked-queue-inl.h"
#if !defined(_WIN32) && !defined(_WIN64)
#include <unistd.h>
#endif // !defined(_WIN32) && !defined(_WIN64)
namespace v8 {
namespace internal {
namespace {
void ReportUncaughtException(v8::Isolate* isolate,
const v8::TryCatch& try_catch) {
CHECK(try_catch.HasCaught());
v8::HandleScope handle_scope(isolate);
std::string message =
*v8::String::Utf8Value(isolate, try_catch.Message()->Get());
int line = try_catch.Message()
->GetLineNumber(isolate->GetCurrentContext())
.FromJust();
std::string source_line = *v8::String::Utf8Value(
isolate, try_catch.Message()
->GetSourceLine(isolate->GetCurrentContext())
.ToLocalChecked());
fprintf(stderr, "Unhandled exception: %s @%s[%d]\n", message.data(),
source_line.data(), line);
}
} // namespace
TaskRunner::TaskRunner(
InspectorIsolateData::SetupGlobalTasks setup_global_tasks,
CatchExceptions catch_exceptions, v8::base::Semaphore* ready_semaphore,
v8::StartupData* startup_data, WithInspector with_inspector)
: Thread(Options("Task Runner")),
setup_global_tasks_(std::move(setup_global_tasks)),
startup_data_(startup_data),
with_inspector_(with_inspector),
catch_exceptions_(catch_exceptions),
ready_semaphore_(ready_semaphore),
data_(nullptr),
process_queue_semaphore_(0),
nested_loop_count_(0),
is_terminated_(0) {
CHECK(Start());
}
TaskRunner::~TaskRunner() {}
void TaskRunner::Run() {
data_.reset(new InspectorIsolateData(this, std::move(setup_global_tasks_),
startup_data_, with_inspector_));
if (ready_semaphore_) ready_semaphore_->Signal();
RunMessageLoop(false);
}
void TaskRunner::RunMessageLoop(bool only_protocol) {
int loop_number = ++nested_loop_count_;
while (nested_loop_count_ == loop_number && !is_terminated_ &&
!isolate()->IsExecutionTerminating()) {
std::unique_ptr<TaskRunner::Task> task = GetNext(only_protocol);
if (!task) return;
v8::Isolate::Scope isolate_scope(isolate());
v8::TryCatch try_catch(isolate());
if (catch_exceptions_ == kStandardPropagateUncaughtExceptions) {
try_catch.SetVerbose(true);
}
task->Run(data_.get());
if (catch_exceptions_ == kFailOnUncaughtExceptions &&
try_catch.HasCaught()) {
ReportUncaughtException(isolate(), try_catch);
base::OS::ExitProcess(0);
}
try_catch.Reset();
task.reset();
// Also pump isolate's foreground task queue to ensure progress.
// This can be removed once https://crbug.com/v8/10747 is fixed.
// TODO(10748): Enable --stress-incremental-marking after the existing
// tests are fixed.
if (!i::v8_flags.stress_incremental_marking &&
!isolate()->IsExecutionTerminating()) {
while (v8::platform::PumpMessageLoop(
v8::internal::V8::GetCurrentPlatform(), isolate(),
isolate()->HasPendingBackgroundTasks()
? platform::MessageLoopBehavior::kWaitForWork
: platform::MessageLoopBehavior::kDoNotWait)) {
}
}
}
}
static void RunMessageLoopInInterrupt(v8::Isolate* isolate, void* task_runner) {
TaskRunner* runner = reinterpret_cast<TaskRunner*>(task_runner);
runner->RunMessageLoop(true);
}
void TaskRunner::InterruptForMessages() {
isolate()->RequestInterrupt(&RunMessageLoopInInterrupt, this);
}
void TaskRunner::QuitMessageLoop() {
DCHECK_LT(0, nested_loop_count_);
--nested_loop_count_;
}
void TaskRunner::Append(std::unique_ptr<Task> task) {
queue_.Enqueue(std::move(task));
process_queue_semaphore_.Signal();
}
void TaskRunner::Terminate() {
is_terminated_++;
isolate()->TerminateExecution();
process_queue_semaphore_.Signal();
}
std::unique_ptr<TaskRunner::Task> TaskRunner::GetNext(bool only_protocol) {
for (;;) {
if (is_terminated_) return nullptr;
if (only_protocol) {
std::unique_ptr<Task> task;
if (queue_.Dequeue(&task)) {
if (task->is_priority_task()) return task;
deferred_queue_.Enqueue(std::move(task));
}
} else {
std::unique_ptr<Task> task;
if (deferred_queue_.Dequeue(&task)) return task;
if (queue_.Dequeue(&task)) return task;
}
process_queue_semaphore_.Wait();
}
}
} // namespace internal
} // namespace v8
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