Chain samples together to collect long stack traces in profiler

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"
 #include "vm/profiler.h"
 #include "vm/reusable_handles.h"
 #include "vm/scope_timer.h"
 
 namespace dart {
 
-DECLARE_FLAG(int, profile_depth);
+DECLARE_FLAG(int, max_profile_depth);
 DECLARE_FLAG(int, profile_period);
 
 DEFINE_FLAG(bool, trace_profiler, false, "Trace profiler.");
 
 class DeoptimizedCodeSet : public ZoneAllocated {
  public:
   explicit DeoptimizedCodeSet(Isolate* isolate)
       : previous_(
             GrowableObjectArray::ZoneHandle(isolate->deoptimized_code_array())),
         current_(GrowableObjectArray::ZoneHandle(
@@ skipping 1830 matching lines @@
 }
 
 
 void Profile::PrintJSON(JSONStream* stream) {
   ScopeTimer sw("Profile::PrintJSON", FLAG_trace_profiler);
   JSONObject obj(stream);
   obj.AddProperty("type", "_CpuProfile");
   obj.AddProperty("samplePeriod",
                   static_cast<intptr_t>(FLAG_profile_period));
   obj.AddProperty("stackDepth",
-                  static_cast<intptr_t>(FLAG_profile_depth));
+                  static_cast<intptr_t>(FLAG_max_profile_depth));
   obj.AddProperty("sampleCount", sample_count());
   obj.AddProperty("timeSpan", MicrosecondsToSeconds(GetTimeSpan()));
   {
     JSONArray codes(&obj, "codes");
     for (intptr_t i = 0; i < live_code_->length(); i++) {
       ProfileCode* code = live_code_->At(i);
       ASSERT(code != NULL);
       code->PrintToJSONArray(&codes);
     }
     for (intptr_t i = 0; i < dead_code_->length(); i++) {
@@ skipping 228 matching lines @@
   ASSERT(sample_buffer != NULL);
 
   ClearProfileVisitor clear_profile(isolate);
   sample_buffer->VisitSamples(&clear_profile);
 
   // Enable profile interrupts.
   Profiler::BeginExecution(isolate);
 }
 
 }  // namespace dart