Line data Source code
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 : #include "src/compiler-dispatcher/optimizing-compile-dispatcher.h"
6 :
7 : #include "src/base/atomicops.h"
8 : #include "src/base/template-utils.h"
9 : #include "src/cancelable-task.h"
10 : #include "src/compiler.h"
11 : #include "src/counters.h"
12 : #include "src/isolate.h"
13 : #include "src/log.h"
14 : #include "src/objects-inl.h"
15 : #include "src/optimized-compilation-info.h"
16 : #include "src/tracing/trace-event.h"
17 : #include "src/v8.h"
18 :
19 : namespace v8 {
20 : namespace internal {
21 :
22 : namespace {
23 :
24 194 : void DisposeCompilationJob(OptimizedCompilationJob* job,
25 : bool restore_function_code) {
26 194 : if (restore_function_code) {
27 : Handle<JSFunction> function = job->compilation_info()->closure();
28 168 : function->set_code(function->shared()->GetCode());
29 84 : if (function->IsInOptimizationQueue()) {
30 : function->ClearOptimizationMarker();
31 : }
32 : // TODO(mvstanton): We can't call EnsureFeedbackVector here due to
33 : // allocation, but we probably shouldn't call set_code either, as this
34 : // sometimes runs on the worker thread!
35 : // JSFunction::EnsureFeedbackVector(function);
36 : }
37 194 : delete job;
38 194 : }
39 :
40 : } // namespace
41 :
42 : class OptimizingCompileDispatcher::CompileTask : public CancelableTask {
43 : public:
44 6852 : explicit CompileTask(Isolate* isolate,
45 : OptimizingCompileDispatcher* dispatcher)
46 : : CancelableTask(isolate),
47 : isolate_(isolate),
48 : worker_thread_runtime_call_stats_(
49 : isolate->counters()->worker_thread_runtime_call_stats()),
50 13704 : dispatcher_(dispatcher) {
51 6852 : base::MutexGuard lock_guard(&dispatcher_->ref_count_mutex_);
52 6852 : ++dispatcher_->ref_count_;
53 6852 : }
54 :
55 13702 : ~CompileTask() override = default;
56 :
57 : private:
58 : // v8::Task overrides.
59 6852 : void RunInternal() override {
60 : DisallowHeapAllocation no_allocation;
61 : DisallowHandleAllocation no_handles;
62 : DisallowHandleDereference no_deref;
63 :
64 : {
65 : WorkerThreadRuntimeCallStatsScope runtime_call_stats_scope(
66 13702 : worker_thread_runtime_call_stats_);
67 : RuntimeCallTimerScope runtimeTimer(
68 : runtime_call_stats_scope.Get(),
69 6852 : RuntimeCallCounterId::kRecompileConcurrent);
70 :
71 6852 : TimerEventScope<TimerEventRecompileConcurrent> timer(isolate_);
72 20554 : TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"),
73 : "V8.RecompileConcurrent");
74 :
75 6851 : if (dispatcher_->recompilation_delay_ != 0) {
76 0 : base::OS::Sleep(base::TimeDelta::FromMilliseconds(
77 0 : dispatcher_->recompilation_delay_));
78 : }
79 :
80 6851 : dispatcher_->CompileNext(dispatcher_->NextInput(true));
81 : }
82 : {
83 6850 : base::MutexGuard lock_guard(&dispatcher_->ref_count_mutex_);
84 6852 : if (--dispatcher_->ref_count_ == 0) {
85 4932 : dispatcher_->ref_count_zero_.NotifyOne();
86 : }
87 : }
88 6852 : }
89 :
90 : Isolate* isolate_;
91 : WorkerThreadRuntimeCallStats* worker_thread_runtime_call_stats_;
92 : OptimizingCompileDispatcher* dispatcher_;
93 :
94 : DISALLOW_COPY_AND_ASSIGN(CompileTask);
95 : };
96 :
97 186912 : OptimizingCompileDispatcher::~OptimizingCompileDispatcher() {
98 : #ifdef DEBUG
99 : {
100 : base::MutexGuard lock_guard(&ref_count_mutex_);
101 : DCHECK_EQ(0, ref_count_);
102 : }
103 : #endif
104 : DCHECK_EQ(0, input_queue_length_);
105 62303 : DeleteArray(input_queue_);
106 62303 : }
107 :
108 6851 : OptimizedCompilationJob* OptimizingCompileDispatcher::NextInput(
109 : bool check_if_flushing) {
110 6851 : base::MutexGuard access_input_queue_(&input_queue_mutex_);
111 6852 : if (input_queue_length_ == 0) return nullptr;
112 13692 : OptimizedCompilationJob* job = input_queue_[InputQueueIndex(0)];
113 : DCHECK_NOT_NULL(job);
114 6846 : input_queue_shift_ = InputQueueIndex(1);
115 6846 : input_queue_length_--;
116 6846 : if (check_if_flushing) {
117 6846 : if (mode_ == FLUSH) {
118 : AllowHandleDereference allow_handle_dereference;
119 25 : DisposeCompilationJob(job, true);
120 : return nullptr;
121 : }
122 : }
123 : return job;
124 : }
125 :
126 6852 : void OptimizingCompileDispatcher::CompileNext(OptimizedCompilationJob* job) {
127 6852 : if (!job) return;
128 :
129 : // The function may have already been optimized by OSR. Simply continue.
130 6821 : CompilationJob::Status status = job->ExecuteJob();
131 : USE(status); // Prevent an unused-variable error.
132 :
133 : {
134 : // The function may have already been optimized by OSR. Simply continue.
135 : // Use a mutex to make sure that functions marked for install
136 : // are always also queued.
137 6816 : base::MutexGuard access_output_queue_(&output_queue_mutex_);
138 : output_queue_.push(job);
139 : }
140 :
141 6821 : isolate_->stack_guard()->RequestInstallCode();
142 : }
143 :
144 85996 : void OptimizingCompileDispatcher::FlushOutputQueue(bool restore_function_code) {
145 155 : for (;;) {
146 : OptimizedCompilationJob* job = nullptr;
147 : {
148 86151 : base::MutexGuard access_output_queue_(&output_queue_mutex_);
149 172148 : if (output_queue_.empty()) return;
150 155 : job = output_queue_.front();
151 : output_queue_.pop();
152 : }
153 :
154 155 : DisposeCompilationJob(job, restore_function_code);
155 : }
156 : }
157 :
158 23693 : void OptimizingCompileDispatcher::Flush(BlockingBehavior blocking_behavior) {
159 23693 : if (blocking_behavior == BlockingBehavior::kDontBlock) {
160 4375 : if (FLAG_block_concurrent_recompilation) Unblock();
161 4375 : base::MutexGuard access_input_queue_(&input_queue_mutex_);
162 4387 : while (input_queue_length_ > 0) {
163 12 : OptimizedCompilationJob* job = input_queue_[InputQueueIndex(0)];
164 : DCHECK_NOT_NULL(job);
165 6 : input_queue_shift_ = InputQueueIndex(1);
166 6 : input_queue_length_--;
167 6 : DisposeCompilationJob(job, true);
168 : }
169 4375 : FlushOutputQueue(true);
170 4375 : if (FLAG_trace_concurrent_recompilation) {
171 0 : PrintF(" ** Flushed concurrent recompilation queues (not blocking).\n");
172 : }
173 : return;
174 : }
175 : mode_ = FLUSH;
176 19318 : if (FLAG_block_concurrent_recompilation) Unblock();
177 : {
178 19318 : base::MutexGuard lock_guard(&ref_count_mutex_);
179 19373 : while (ref_count_ > 0) ref_count_zero_.Wait(&ref_count_mutex_);
180 : mode_ = COMPILE;
181 : }
182 19318 : FlushOutputQueue(true);
183 19318 : if (FLAG_trace_concurrent_recompilation) {
184 0 : PrintF(" ** Flushed concurrent recompilation queues.\n");
185 : }
186 : }
187 :
188 62303 : void OptimizingCompileDispatcher::Stop() {
189 : mode_ = FLUSH;
190 62303 : if (FLAG_block_concurrent_recompilation) Unblock();
191 : {
192 62303 : base::MutexGuard lock_guard(&ref_count_mutex_);
193 62356 : while (ref_count_ > 0) ref_count_zero_.Wait(&ref_count_mutex_);
194 : mode_ = COMPILE;
195 : }
196 :
197 62304 : if (recompilation_delay_ != 0) {
198 : // At this point the optimizing compiler thread's event loop has stopped.
199 : // There is no need for a mutex when reading input_queue_length_.
200 0 : while (input_queue_length_ > 0) CompileNext(NextInput());
201 0 : InstallOptimizedFunctions();
202 : } else {
203 62304 : FlushOutputQueue(false);
204 : }
205 62303 : }
206 :
207 6121 : void OptimizingCompileDispatcher::InstallOptimizedFunctions() {
208 6121 : HandleScope handle_scope(isolate_);
209 :
210 : for (;;) {
211 : OptimizedCompilationJob* job = nullptr;
212 : {
213 12787 : base::MutexGuard access_output_queue_(&output_queue_mutex_);
214 18908 : if (output_queue_.empty()) return;
215 6666 : job = output_queue_.front();
216 : output_queue_.pop();
217 : }
218 : OptimizedCompilationInfo* info = job->compilation_info();
219 6666 : Handle<JSFunction> function(*info->closure(), isolate_);
220 6666 : if (function->HasOptimizedCode()) {
221 8 : if (FLAG_trace_concurrent_recompilation) {
222 0 : PrintF(" ** Aborting compilation for ");
223 0 : function->ShortPrint();
224 0 : PrintF(" as it has already been optimized.\n");
225 : }
226 8 : DisposeCompilationJob(job, false);
227 : } else {
228 6658 : Compiler::FinalizeOptimizedCompilationJob(job, isolate_);
229 : }
230 : }
231 : }
232 :
233 6852 : void OptimizingCompileDispatcher::QueueForOptimization(
234 : OptimizedCompilationJob* job) {
235 : DCHECK(IsQueueAvailable());
236 : {
237 : // Add job to the back of the input queue.
238 6852 : base::MutexGuard access_input_queue(&input_queue_mutex_);
239 : DCHECK_LT(input_queue_length_, input_queue_capacity_);
240 13704 : input_queue_[InputQueueIndex(input_queue_length_)] = job;
241 6852 : input_queue_length_++;
242 : }
243 6852 : if (FLAG_block_concurrent_recompilation) {
244 76 : blocked_jobs_++;
245 : } else {
246 13552 : V8::GetCurrentPlatform()->CallOnWorkerThread(
247 20328 : base::make_unique<CompileTask>(isolate_, this));
248 : }
249 6852 : }
250 :
251 211 : void OptimizingCompileDispatcher::Unblock() {
252 363 : while (blocked_jobs_ > 0) {
253 152 : V8::GetCurrentPlatform()->CallOnWorkerThread(
254 228 : base::make_unique<CompileTask>(isolate_, this));
255 76 : blocked_jobs_--;
256 : }
257 211 : }
258 :
259 : } // namespace internal
260 121996 : } // namespace v8
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