Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #ifndef V8_OPTIMIZING_COMPILER_THREAD_H_ |
| 6 | #define V8_OPTIMIZING_COMPILER_THREAD_H_ |
| 7 | |
| 8 | #include "src/base/atomicops.h" |
| 9 | #include "src/base/platform/mutex.h" |
| 10 | #include "src/base/platform/platform.h" |
| 11 | #include "src/base/platform/time.h" |
| 12 | #include "src/flags.h" |
| 13 | #include "src/list.h" |
| 14 | #include "src/unbound-queue-inl.h" |
| 15 | |
| 16 | namespace v8 { |
| 17 | namespace internal { |
| 18 | |
| 19 | class HOptimizedGraphBuilder; |
| 20 | class OptimizedCompileJob; |
| 21 | class SharedFunctionInfo; |
| 22 | |
| 23 | class OptimizingCompilerThread : public base::Thread { |
| 24 | public: |
| 25 | explicit OptimizingCompilerThread(Isolate* isolate) |
| 26 | : Thread(Options("OptimizingCompilerThread")), |
| 27 | #ifdef DEBUG |
| 28 | thread_id_(0), |
| 29 | #endif |
| 30 | isolate_(isolate), |
| 31 | stop_semaphore_(0), |
| 32 | input_queue_semaphore_(0), |
| 33 | input_queue_capacity_(FLAG_concurrent_recompilation_queue_length), |
| 34 | input_queue_length_(0), |
| 35 | input_queue_shift_(0), |
| 36 | osr_buffer_capacity_(FLAG_concurrent_recompilation_queue_length + 4), |
| 37 | osr_buffer_cursor_(0), |
| 38 | osr_hits_(0), |
| 39 | osr_attempts_(0), |
| 40 | blocked_jobs_(0) { |
| 41 | base::NoBarrier_Store(&stop_thread_, |
| 42 | static_cast<base::AtomicWord>(CONTINUE)); |
| 43 | input_queue_ = NewArray<OptimizedCompileJob*>(input_queue_capacity_); |
| 44 | if (FLAG_concurrent_osr) { |
| 45 | // Allocate and mark OSR buffer slots as empty. |
| 46 | osr_buffer_ = NewArray<OptimizedCompileJob*>(osr_buffer_capacity_); |
| 47 | for (int i = 0; i < osr_buffer_capacity_; i++) osr_buffer_[i] = NULL; |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | ~OptimizingCompilerThread(); |
| 52 | |
| 53 | void Run(); |
| 54 | void Stop(); |
| 55 | void Flush(); |
| 56 | void QueueForOptimization(OptimizedCompileJob* optimizing_compiler); |
| 57 | void Unblock(); |
| 58 | void InstallOptimizedFunctions(); |
| 59 | OptimizedCompileJob* FindReadyOSRCandidate(Handle<JSFunction> function, |
| 60 | BailoutId osr_ast_id); |
| 61 | bool IsQueuedForOSR(Handle<JSFunction> function, BailoutId osr_ast_id); |
| 62 | |
| 63 | bool IsQueuedForOSR(JSFunction* function); |
| 64 | |
| 65 | inline bool IsQueueAvailable() { |
| 66 | base::LockGuard<base::Mutex> access_input_queue(&input_queue_mutex_); |
| 67 | return input_queue_length_ < input_queue_capacity_; |
| 68 | } |
| 69 | |
| 70 | inline void AgeBufferedOsrJobs() { |
| 71 | // Advance cursor of the cyclic buffer to next empty slot or stale OSR job. |
| 72 | // Dispose said OSR job in the latter case. Calling this on every GC |
| 73 | // should make sure that we do not hold onto stale jobs indefinitely. |
| 74 | AddToOsrBuffer(NULL); |
| 75 | } |
| 76 | |
| 77 | static bool Enabled(int max_available) { |
| 78 | return (FLAG_concurrent_recompilation && max_available > 1); |
| 79 | } |
| 80 | |
| 81 | #ifdef DEBUG |
| 82 | static bool IsOptimizerThread(Isolate* isolate); |
| 83 | bool IsOptimizerThread(); |
| 84 | #endif |
| 85 | |
| 86 | private: |
| 87 | enum StopFlag { CONTINUE, STOP, FLUSH }; |
| 88 | |
| 89 | void FlushInputQueue(bool restore_function_code); |
| 90 | void FlushOutputQueue(bool restore_function_code); |
| 91 | void FlushOsrBuffer(bool restore_function_code); |
| 92 | void CompileNext(); |
| 93 | OptimizedCompileJob* NextInput(); |
| 94 | |
| 95 | // Add a recompilation task for OSR to the cyclic buffer, awaiting OSR entry. |
| 96 | // Tasks evicted from the cyclic buffer are discarded. |
| 97 | void AddToOsrBuffer(OptimizedCompileJob* compiler); |
| 98 | |
| 99 | inline int InputQueueIndex(int i) { |
| 100 | int result = (i + input_queue_shift_) % input_queue_capacity_; |
| 101 | DCHECK_LE(0, result); |
| 102 | DCHECK_LT(result, input_queue_capacity_); |
| 103 | return result; |
| 104 | } |
| 105 | |
| 106 | #ifdef DEBUG |
| 107 | int thread_id_; |
| 108 | base::Mutex thread_id_mutex_; |
| 109 | #endif |
| 110 | |
| 111 | Isolate* isolate_; |
| 112 | base::Semaphore stop_semaphore_; |
| 113 | base::Semaphore input_queue_semaphore_; |
| 114 | |
| 115 | // Circular queue of incoming recompilation tasks (including OSR). |
| 116 | OptimizedCompileJob** input_queue_; |
| 117 | int input_queue_capacity_; |
| 118 | int input_queue_length_; |
| 119 | int input_queue_shift_; |
| 120 | base::Mutex input_queue_mutex_; |
| 121 | |
| 122 | // Queue of recompilation tasks ready to be installed (excluding OSR). |
| 123 | UnboundQueue<OptimizedCompileJob*> output_queue_; |
| 124 | |
| 125 | // Cyclic buffer of recompilation tasks for OSR. |
| 126 | OptimizedCompileJob** osr_buffer_; |
| 127 | int osr_buffer_capacity_; |
| 128 | int osr_buffer_cursor_; |
| 129 | |
| 130 | volatile base::AtomicWord stop_thread_; |
| 131 | base::TimeDelta time_spent_compiling_; |
| 132 | base::TimeDelta time_spent_total_; |
| 133 | |
| 134 | int osr_hits_; |
| 135 | int osr_attempts_; |
| 136 | |
| 137 | int blocked_jobs_; |
| 138 | }; |
| 139 | |
| 140 | } } // namespace v8::internal |
| 141 | |
| 142 | #endif // V8_OPTIMIZING_COMPILER_THREAD_H_ |