blob: d1d295f0630bd50f1889060456234e3d9c41fa91 [file] [log] [blame]
// Copyright 2012 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 <queue>
#include "src/allocation.h"
#include "src/base/atomicops.h"
#include "src/base/platform/condition-variable.h"
#include "src/base/platform/mutex.h"
#include "src/base/platform/platform.h"
#include "src/flags.h"
#include "src/globals.h"
namespace v8 {
namespace internal {
class CompilationJob;
class SharedFunctionInfo;
class V8_EXPORT_PRIVATE OptimizingCompileDispatcher {
enum class BlockingBehavior { kBlock, kDontBlock };
explicit OptimizingCompileDispatcher(Isolate* isolate)
: isolate_(isolate),
recompilation_delay_(FLAG_concurrent_recompilation_delay) {
base::Relaxed_Store(&mode_, static_cast<base::AtomicWord>(COMPILE));
input_queue_ = NewArray<CompilationJob*>(input_queue_capacity_);
void Stop();
void Flush(BlockingBehavior blocking_behavior);
// Takes ownership of |job|.
void QueueForOptimization(CompilationJob* job);
void Unblock();
void InstallOptimizedFunctions();
inline bool IsQueueAvailable() {
base::LockGuard<base::Mutex> access_input_queue(&input_queue_mutex_);
return input_queue_length_ < input_queue_capacity_;
static bool Enabled() { return FLAG_concurrent_recompilation; }
class CompileTask;
enum ModeFlag { COMPILE, FLUSH };
void FlushOutputQueue(bool restore_function_code);
void CompileNext(CompilationJob* job);
CompilationJob* NextInput(bool check_if_flushing = false);
inline int InputQueueIndex(int i) {
int result = (i + input_queue_shift_) % input_queue_capacity_;
DCHECK_LE(0, result);
DCHECK_LT(result, input_queue_capacity_);
return result;
Isolate* isolate_;
// Circular queue of incoming recompilation tasks (including OSR).
CompilationJob** input_queue_;
int input_queue_capacity_;
int input_queue_length_;
int input_queue_shift_;
base::Mutex input_queue_mutex_;
// Queue of recompilation tasks ready to be installed (excluding OSR).
std::queue<CompilationJob*> output_queue_;
// Used for job based recompilation which has multiple producers on
// different threads.
base::Mutex output_queue_mutex_;
volatile base::AtomicWord mode_;
int blocked_jobs_;
int ref_count_;
base::Mutex ref_count_mutex_;
base::ConditionVariable ref_count_zero_;
// Copy of FLAG_concurrent_recompilation_delay that will be used from the
// background thread.
// Since flags might get modified while the background thread is running, it
// is not safe to access them directly.
int recompilation_delay_;
} // namespace internal
} // namespace v8