Add allocation tracker test for bumb pointer allocations

test/cctest/test-heap-profiler.cc

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 // modification, are permitted provided that the following conditions are
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 //
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@@ skipping 2212 matching lines @@
 
   const char* names[] =
       { "(anonymous function)", "start", "f_0_0", "f_0_1", "f_0_2" };
   AllocationTraceNode* node =
       FindNode(tracker, Vector<const char*>(names, ARRAY_SIZE(names)));
   CHECK_NE(NULL, node);
   CHECK_GE(node->allocation_count(), 100);
   CHECK_GE(node->allocation_size(), 4 * node->allocation_count());
   heap_profiler->StopRecordingHeapAllocations();
 }
+
+
+static const char* inline_heap_allocation_source =

[loislo, 2013/11/15 13:44:15]

I see no reason to think that it was an inline allocation except the knowledge
about v8 internals.
So lets rename the test or add the check that it was the inline allocation.

[yurys, 2013/11/15 14:32:26]

Done. Added additional step which checks that the number of allocations is
incorrect if inline allocations are manually enabled. PTAL.

+"function f_0(x) {\n"
+"  try {\n"
+"    return f_1(x+1);\n"
+"  } catch (e) {}\n"
+"}\n"
+"function f_1(x) {\n"
+"  try {\n"

[Michael Starzinger, 2013/11/15 13:38:39]

I guess the try-catch is used to prevent optimization. We could also use
%NeverOptimizeFunction() instead. I don't mind either way, I'll leave the
decision up to you.

[yurys, 2013/11/15 13:48:06]

You are right, try-catch is here just to prevent optimizations. I'll change it
to %NeverOptimizeFunction as its name conveys the intent clearly.

+"    return new f_2(x+1);\n"
+"  } catch (e) {}\n"
+"}\n"
+"function f_2(x) {\n"
+"  this.foo = x;\n"
+"}\n"
+"var instances = [];\n"
+"function start() {\n"
+"  instances.push(f_0(0));\n"
+"}\n"
+"\n"
+"for (var i = 0; i < 100; i++) start();\n";
+
+
+TEST(TrackBumpPointerAllocations) {
+  v8::HandleScope scope(v8::Isolate::GetCurrent());
+  LocalContext env;
+
+  v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
+  heap_profiler->StartRecordingHeapAllocations();
+
+  CompileRun(inline_heap_allocation_source);
+
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot(
+      v8::String::New("Test"));
+  i::HeapSnapshotsCollection* collection = ToInternal(snapshot)->collection();
+  AllocationTracker* tracker = collection->allocation_tracker();
+  CHECK_NE(NULL, tracker);
+  // Resolve all function locations.
+  tracker->PrepareForSerialization();
+  // Print for better diagnostics in case of failure.
+  tracker->trace_tree()->Print(tracker);
+
+  const char* names[] =
+      { "(anonymous function)", "start", "f_0", "f_1" };
+  AllocationTraceNode* node =
+      FindNode(tracker, Vector<const char*>(names, ARRAY_SIZE(names)));
+  CHECK_NE(NULL, node);
+  CHECK_GE(node->allocation_count(), 100);
+  CHECK_GE(node->allocation_size(), 4 * node->allocation_count());
+  heap_profiler->StopRecordingHeapAllocations();
+}