DBC: Collect type feedback for fastpath smi ops

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/hash_map.h"
 #include "vm/log.h"
 #include "vm/native_symbol.h"
@@ skipping 1237 matching lines @@
         null_function_(Function::ZoneHandle()),
         tick_functions_(false),
         inclusive_tree_(false),
         samples_(NULL),
         info_kind_(kNone) {
     ASSERT(profile_ != NULL);
   }
 
   void Build() {
     ScopeTimer sw("ProfileBuilder::Build", FLAG_trace_profiler);
-    FilterSamples();
+    if (!FilterSamples()) {
+      return;
+    }
 
     Setup();
     BuildCodeTable();
     FinalizeCodeIndexes();
     BuildFunctionTable();
 
     BuildCodeTrie(Profile::kExclusiveCode);
     BuildCodeTrie(Profile::kInclusiveCode);
 
     BuildFunctionTrie(Profile::kExclusiveFunction);
@@ skipping 21 matching lines @@
     RegisterProfileCodeTag(VMTag::kRootTagId);
     RegisterProfileCodeTag(VMTag::kTruncatedTagId);
     RegisterProfileCodeTag(VMTag::kNoneCodeTagId);
     RegisterProfileCodeTag(VMTag::kOptimizedCodeTagId);
     RegisterProfileCodeTag(VMTag::kUnoptimizedCodeTagId);
     RegisterProfileCodeTag(VMTag::kNativeCodeTagId);
     RegisterProfileCodeTag(VMTag::kInlineStartCodeTagId);
     RegisterProfileCodeTag(VMTag::kInlineEndCodeTagId);
   }
 
-  void FilterSamples() {
+  bool FilterSamples() {
     ScopeTimer sw("ProfileBuilder::FilterSamples", FLAG_trace_profiler);
     SampleBuffer* sample_buffer = Profiler::sample_buffer();
     if (sample_buffer == NULL) {
-      return;
+      return false;
     }
     samples_ = sample_buffer->BuildProcessedSampleBuffer(filter_);
     profile_->samples_ = samples_;
     profile_->sample_count_ = samples_->length();
+    return true;
   }
 
   void UpdateMinMaxTimes(int64_t timestamp) {
     profile_->min_time_ =
         timestamp < profile_->min_time_ ? timestamp : profile_->min_time_;
     profile_->max_time_ =
         timestamp > profile_->max_time_ ? timestamp : profile_->max_time_;
   }
 
   void SanitizeMinMaxTimes() {
@@ skipping 1192 matching lines @@
       ProfileTrieNode* trie = sample->timeline_trie();
       ASSERT(trie->frame_id() != -1);
       event.AddPropertyF("sf", "%" Pd "-%" Pd,
                          isolate_id, trie->frame_id());
     }
   }
 }
 
 
 ProfileFunction* Profile::FindFunction(const Function& function) {
-  return functions_->Lookup(function);
+  return (functions_ != NULL) ? functions_->Lookup(function) : NULL;
 }
 
 
 void Profile::PrintProfileJSON(JSONStream* stream) {
   ScopeTimer sw("Profile::PrintProfileJSON", FLAG_trace_profiler);
   JSONObject obj(stream);
   obj.AddProperty("type", "_CpuProfile");
   PrintHeaderJSON(&obj);
   {
     JSONArray codes(&obj, "codes");
@@ skipping 325 matching lines @@
   // Disable thread interrupts while processing the buffer.
   DisableThreadInterruptsScope dtis(thread);
 
   ClearProfileVisitor clear_profile(isolate);
   sample_buffer->VisitSamples(&clear_profile);
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart