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27
28#ifndef V8_OPTIMIZING_COMPILER_THREAD_H_
29#define V8_OPTIMIZING_COMPILER_THREAD_H_
30
31#include "atomicops.h"
32#include "flags.h"
33#include "platform.h"
34#include "unbound-queue-inl.h"
35
36namespace v8 {
37namespace internal {
38
39class HOptimizedGraphBuilder;
40class OptimizingCompiler;
41class SharedFunctionInfo;
42
43class OptimizingCompilerThread : public Thread {
44 public:
45  explicit OptimizingCompilerThread(Isolate *isolate) :
46      Thread("OptimizingCompilerThread"),
47#ifdef DEBUG
48      thread_id_(0),
49      thread_id_mutex_(OS::CreateMutex()),
50#endif
51      isolate_(isolate),
52      stop_semaphore_(OS::CreateSemaphore(0)),
53      input_queue_semaphore_(OS::CreateSemaphore(0)),
54      install_mutex_(OS::CreateMutex()),
55      time_spent_compiling_(0),
56      time_spent_total_(0) {
57    NoBarrier_Store(&stop_thread_, static_cast<AtomicWord>(CONTINUE));
58    NoBarrier_Store(&queue_length_, static_cast<AtomicWord>(0));
59  }
60
61  void Run();
62  void Stop();
63  void Flush();
64  void QueueForOptimization(OptimizingCompiler* optimizing_compiler);
65  void InstallOptimizedFunctions();
66
67  inline bool IsQueueAvailable() {
68    // We don't need a barrier since we have a data dependency right
69    // after.
70    Atomic32 current_length = NoBarrier_Load(&queue_length_);
71
72    // This can be queried only from the execution thread.
73    ASSERT(!IsOptimizerThread());
74    // Since only the execution thread increments queue_length_ and
75    // only one thread can run inside an Isolate at one time, a direct
76    // doesn't introduce a race -- queue_length_ may decreased in
77    // meantime, but not increased.
78    return (current_length < FLAG_parallel_recompilation_queue_length);
79  }
80
81#ifdef DEBUG
82  bool IsOptimizerThread();
83#endif
84
85  ~OptimizingCompilerThread() {
86    delete install_mutex_;
87    delete input_queue_semaphore_;
88    delete stop_semaphore_;
89#ifdef DEBUG
90    delete thread_id_mutex_;
91#endif
92  }
93
94 private:
95  enum StopFlag { CONTINUE, STOP, FLUSH };
96
97  void FlushInputQueue(bool restore_function_code);
98  void FlushOutputQueue(bool restore_function_code);
99
100  void CompileNext();
101
102#ifdef DEBUG
103  int thread_id_;
104  Mutex* thread_id_mutex_;
105#endif
106
107  Isolate* isolate_;
108  Semaphore* stop_semaphore_;
109  Semaphore* input_queue_semaphore_;
110  UnboundQueue<OptimizingCompiler*> input_queue_;
111  UnboundQueue<OptimizingCompiler*> output_queue_;
112  Mutex* install_mutex_;
113  volatile AtomicWord stop_thread_;
114  volatile Atomic32 queue_length_;
115  int64_t time_spent_compiling_;
116  int64_t time_spent_total_;
117};
118
119} }  // namespace v8::internal
120
121#endif  // V8_OPTIMIZING_COMPILER_THREAD_H_
122