Support narrowing a cpu profile to a given time window

runtime/vm/profiler_service.cc

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/profiler_service.h"
 
 #include "vm/growable_array.h"
 #include "vm/native_symbol.h"
 #include "vm/object.h"
 #include "vm/os.h"
@@ skipping 2286 matching lines @@
       profile.PrintTimelineJSON(stream);
     } else {
       profile.PrintProfileJSON(stream);
     }
   }
 }
 
 
 class NoAllocationSampleFilter : public SampleFilter {
  public:
-  explicit NoAllocationSampleFilter(Isolate* isolate)
-      : SampleFilter(isolate) {
+  NoAllocationSampleFilter(Isolate* isolate,
+                           int64_t time_origin_micros,
+                           int64_t time_extent_micros)
+      : SampleFilter(isolate,
+                     time_origin_micros,
+                     time_extent_micros) {
   }
 
   bool FilterSample(Sample* sample) {
     return !sample->is_allocation_sample();
   }
 };
 
 
 void ProfilerService::PrintJSON(JSONStream* stream,
                                 Profile::TagOrder tag_order,
-                                intptr_t extra_tags) {
+                                intptr_t extra_tags,
+                                int64_t time_origin_micros,
+                                int64_t time_extent_micros) {
   Thread* thread = Thread::Current();
   Isolate* isolate = thread->isolate();
-  NoAllocationSampleFilter filter(isolate);
+  NoAllocationSampleFilter filter(isolate,
+                                  time_origin_micros,
+                                  time_extent_micros);
   const bool as_timeline = false;
   PrintJSONImpl(thread, stream, tag_order, extra_tags, &filter, as_timeline);
 }
 
 
 class ClassAllocationSampleFilter : public SampleFilter {
  public:
-  ClassAllocationSampleFilter(Isolate* isolate, const Class& cls)
-      : SampleFilter(isolate),
+  ClassAllocationSampleFilter(Isolate* isolate,
+                              const Class& cls,
+                              int64_t time_origin_micros,
+                              int64_t time_extent_micros)
+      : SampleFilter(isolate,
+                     time_origin_micros,
+                     time_extent_micros),
         cls_(Class::Handle(cls.raw())) {
     ASSERT(!cls_.IsNull());
   }
 
   bool FilterSample(Sample* sample) {
     return sample->is_allocation_sample() &&
            (sample->allocation_cid() == cls_.id());
   }
 
  private:
   const Class& cls_;
 };
 
 
 void ProfilerService::PrintAllocationJSON(JSONStream* stream,
                                           Profile::TagOrder tag_order,
-                                          const Class& cls) {
+                                          const Class& cls,
+                                          int64_t time_origin_micros,
+                                          int64_t time_extent_micros) {
   Thread* thread = Thread::Current();
   Isolate* isolate = thread->isolate();
-  ClassAllocationSampleFilter filter(isolate, cls);
+  ClassAllocationSampleFilter filter(isolate,
+                                     cls,
+                                     time_origin_micros,
+                                     time_extent_micros);
   const bool as_timeline = false;
   PrintJSONImpl(thread, stream, tag_order, kNoExtraTags, &filter, as_timeline);
 }
 
 
 void ProfilerService::PrintTimelineJSON(JSONStream* stream,
-                                        Profile::TagOrder tag_order) {
+                                        Profile::TagOrder tag_order,
+                                        int64_t time_origin_micros,
+                                        int64_t time_extent_micros) {
   Thread* thread = Thread::Current();
   Isolate* isolate = thread->isolate();
-  NoAllocationSampleFilter filter(isolate);
+  NoAllocationSampleFilter filter(isolate,
+                                  time_origin_micros,
+                                  time_extent_micros);
   const bool as_timeline = true;
   PrintJSONImpl(thread, stream, tag_order, kNoExtraTags, &filter, as_timeline);
 }
 
 
 void ProfilerService::ClearSamples() {
   SampleBuffer* sample_buffer = Profiler::sample_buffer();
   if (sample_buffer == NULL) {
     return;
   }
 
   Thread* thread = Thread::Current();
   Isolate* isolate = thread->isolate();
 
   // Disable thread interrupts while processing the buffer.
   DisableThreadInterruptsScope dtis(thread);
 
   ClearProfileVisitor clear_profile(isolate);
   sample_buffer->VisitSamples(&clear_profile);
 }
 
 }  // namespace dart