Correctly report callstack when current function is FunctionCall builtin

test/cctest/test-cpu-profiler.cc

Index: test/cctest/test-cpu-profiler.cc
diff --git a/test/cctest/test-cpu-profiler.cc b/test/cctest/test-cpu-profiler.cc
index 251a4a529095eb260742d8fa613b679adc301656..f4d9936329981a650ce3fb27caa29b29aadb8a17 100644
--- a/test/cctest/test-cpu-profiler.cc
+++ b/test/cctest/test-cpu-profiler.cc
@@ -1023,3 +1023,80 @@ TEST(BoundFunctionCall) {
 
   cpu_profiler->DeleteAllCpuProfiles();
 }
+
+
+static const char* call_function_test_source = "function bar(iterations) {\n"
+"}\n"
+"function start(duration) {\n"
+"  var start = Date.now();\n"
+"  while (Date.now() - start < duration) {\n"
+"    try {\n"
+"      bar.call(this, 10 * 1000);\n"
+"    } catch(e) {}\n"
+"  }\n"
+"}";
+
+
+// Test that if we sampled thread when it was inside FunctionCall buitin then
+// its caller frame will be '(unresolved function)' as we have no reliable way
+// to resolve it.
+//
+// [Top down]:
+//    96     0   (root) [-1] #1
+//     1     1    (garbage collector) [-1] #4
+//     5     0    (unresolved function) [-1] #5
+//     5     5      call [-1] #6
+//    71    70    start [-1] #3
+//     1     1      bar [-1] #7
+//    19    19    (program) [-1] #2
+TEST(FunctionCallSample) {
+  LocalContext env;
+  v8::HandleScope scope(env->GetIsolate());
+
+  v8::Script::Compile(v8::String::New(call_function_test_source))->Run();
+  v8::Local<v8::Function> function = v8::Local<v8::Function>::Cast(
+      env->Global()->Get(v8::String::New("start")));
+
+  v8::CpuProfiler* cpu_profiler = env->GetIsolate()->GetCpuProfiler();
+  v8::Local<v8::String> profile_name = v8::String::New("my_profile");
+
+  cpu_profiler->StartCpuProfiling(profile_name);
+  int32_t duration_ms = 100;
+  v8::Handle<v8::Value> args[] = { v8::Integer::New(duration_ms) };
+  function->Call(env->Global(), ARRAY_SIZE(args), args);
+  const v8::CpuProfile* profile = cpu_profiler->StopCpuProfiling(profile_name);
+
+  CHECK_NE(NULL, profile);
+  // Dump collected profile to have a better diagnostic in case of failure.
+  reinterpret_cast<i::CpuProfile*>(
+      const_cast<v8::CpuProfile*>(profile))->Print();
+
+  const v8::CpuProfileNode* root = profile->GetTopDownRoot();
+  {
+    ScopedVector<v8::Handle<v8::String> > names(4);
+    names[0] = v8::String::New(ProfileGenerator::kGarbageCollectorEntryName);
+    names[1] = v8::String::New(ProfileGenerator::kProgramEntryName);
+    names[2] = v8::String::New("start");
+    names[3] = v8::String::New(i::ProfileGenerator::kUnresolvedFunctionName);
+    // Don't allow |bar| and |call| nodes to be at the top level.
+    CheckChildrenNames(root, names);
+  }
+
+  const v8::CpuProfileNode* startNode = GetChild(root, "start");
+  {
+    ScopedVector<v8::Handle<v8::String> > names(1);
+    names[0] = v8::String::New("bar");
+    CheckChildrenNames(startNode, names);
+  }
+
+  const v8::CpuProfileNode* unresolvedNode =
+      FindChild(root, i::ProfileGenerator::kUnresolvedFunctionName);
+  if (unresolvedNode) {
+    ScopedVector<v8::Handle<v8::String> > names(1);
+    names[0] = v8::String::New("call");
+    CheckChildrenNames(unresolvedNode, names);
+  }
+
+  cpu_profiler->DeleteAllCpuProfiles();
+}
+