Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +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_COMPILE_DISPATCHER_H_ |
| 6 | #define V8_OPTIMIZING_COMPILE_DISPATCHER_H_ |
| 7 | |
| 8 | #include <queue> |
| 9 | |
| 10 | #include "src/base/atomicops.h" |
| 11 | #include "src/base/platform/condition-variable.h" |
| 12 | #include "src/base/platform/mutex.h" |
| 13 | #include "src/base/platform/platform.h" |
| 14 | #include "src/flags.h" |
| 15 | #include "src/list.h" |
| 16 | |
| 17 | namespace v8 { |
| 18 | namespace internal { |
| 19 | |
| 20 | class HOptimizedGraphBuilder; |
| 21 | class OptimizedCompileJob; |
| 22 | class SharedFunctionInfo; |
| 23 | |
| 24 | class OptimizingCompileDispatcher { |
| 25 | public: |
| 26 | explicit OptimizingCompileDispatcher(Isolate* isolate) |
| 27 | : isolate_(isolate), |
| 28 | input_queue_capacity_(FLAG_concurrent_recompilation_queue_length), |
| 29 | input_queue_length_(0), |
| 30 | input_queue_shift_(0), |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 31 | blocked_jobs_(0), |
| 32 | ref_count_(0), |
| 33 | recompilation_delay_(FLAG_concurrent_recompilation_delay) { |
| 34 | base::NoBarrier_Store(&mode_, static_cast<base::AtomicWord>(COMPILE)); |
| 35 | input_queue_ = NewArray<OptimizedCompileJob*>(input_queue_capacity_); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 36 | } |
| 37 | |
| 38 | ~OptimizingCompileDispatcher(); |
| 39 | |
| 40 | void Run(); |
| 41 | void Stop(); |
| 42 | void Flush(); |
| 43 | void QueueForOptimization(OptimizedCompileJob* optimizing_compiler); |
| 44 | void Unblock(); |
| 45 | void InstallOptimizedFunctions(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 46 | |
| 47 | inline bool IsQueueAvailable() { |
| 48 | base::LockGuard<base::Mutex> access_input_queue(&input_queue_mutex_); |
| 49 | return input_queue_length_ < input_queue_capacity_; |
| 50 | } |
| 51 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 52 | static bool Enabled() { return FLAG_concurrent_recompilation; } |
| 53 | |
| 54 | private: |
| 55 | class CompileTask; |
| 56 | |
| 57 | enum ModeFlag { COMPILE, FLUSH }; |
| 58 | |
| 59 | void FlushOutputQueue(bool restore_function_code); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 60 | void CompileNext(OptimizedCompileJob* job); |
| 61 | OptimizedCompileJob* NextInput(bool check_if_flushing = false); |
| 62 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 63 | inline int InputQueueIndex(int i) { |
| 64 | int result = (i + input_queue_shift_) % input_queue_capacity_; |
| 65 | DCHECK_LE(0, result); |
| 66 | DCHECK_LT(result, input_queue_capacity_); |
| 67 | return result; |
| 68 | } |
| 69 | |
| 70 | Isolate* isolate_; |
| 71 | |
| 72 | // Circular queue of incoming recompilation tasks (including OSR). |
| 73 | OptimizedCompileJob** input_queue_; |
| 74 | int input_queue_capacity_; |
| 75 | int input_queue_length_; |
| 76 | int input_queue_shift_; |
| 77 | base::Mutex input_queue_mutex_; |
| 78 | |
| 79 | // Queue of recompilation tasks ready to be installed (excluding OSR). |
| 80 | std::queue<OptimizedCompileJob*> output_queue_; |
| 81 | // Used for job based recompilation which has multiple producers on |
| 82 | // different threads. |
| 83 | base::Mutex output_queue_mutex_; |
| 84 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 85 | volatile base::AtomicWord mode_; |
| 86 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 87 | int blocked_jobs_; |
| 88 | |
| 89 | int ref_count_; |
| 90 | base::Mutex ref_count_mutex_; |
| 91 | base::ConditionVariable ref_count_zero_; |
| 92 | |
| 93 | // Copy of FLAG_concurrent_recompilation_delay that will be used from the |
| 94 | // background thread. |
| 95 | // |
| 96 | // Since flags might get modified while the background thread is running, it |
| 97 | // is not safe to access them directly. |
| 98 | int recompilation_delay_; |
| 99 | }; |
| 100 | } // namespace internal |
| 101 | } // namespace v8 |
| 102 | |
| 103 | #endif // V8_OPTIMIZING_COMPILE_DISPATCHER_H_ |