- Base JSON stream printing on stack objects.

runtime/vm/coverage.cc

Index: runtime/vm/coverage.cc
===================================================================
--- runtime/vm/coverage.cc	(revision 0)
+++ runtime/vm/coverage.cc	(revision 0)
@@ -0,0 +1,99 @@
+// Copyright (c) 2013, 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/coverage.h"
+
+#include "vm/isolate.h"
+#include "vm/json_stream.h"
+#include "vm/object.h"
+#include "vm/object_store.h"
+
+namespace dart {
+
+DEFINE_FLAG(bool, print_coverage, false, "Print code coverage.");
+
+void CodeCoverage::PrintClass(const Class& cls, const JSONArray& jsarr) {
+  const Array& functions = Array::Handle(cls.functions());
+  ASSERT(!functions.IsNull());
+  Function& function = Function::Handle();
+  Code& code = Code::Handle();
+  Script& script = Script::Handle();
+  String& url = String::Handle();
+  String& name = String::Handle();
+  PcDescriptors& descriptors = PcDescriptors::Handle();
+  Array& ic_array = Array::Handle();
+  ICData& ic_data = ICData::Handle();
+  for (int i = 0; i < functions.Length(); i++) {
+    function ^= functions.At(i);
+    if (function.HasCode()) {
+      JSONObject jsobj(jsarr);
+
+      script = function.script();
+      url = script.url();
+      name = function.QualifiedUserVisibleName();
+      jsobj.AddProperty("source", url.ToCString());
+      jsobj.AddProperty("function", name.ToCString());
+
+      code = function.unoptimized_code();
+      ic_array = code.ExtractTypeFeedbackArray();
+      descriptors = code.pc_descriptors();
+
+      JSONArray jsarr(jsobj, "hits");
+      for (int j = 0; j < descriptors.Length(); j++) {
+        PcDescriptors::Kind kind = descriptors.DescriptorKind(j);
+        // Only IC based calls have counting.
+        if ((kind == PcDescriptors::kIcCall) ||
+            (kind == PcDescriptors::kUnoptStaticCall)) {
+          intptr_t deopt_id = descriptors.DeoptId(j);
+          ic_data ^= ic_array.At(deopt_id);
+          if (!ic_data.IsNull() && (ic_data.AggregateCount() > 0)) {
+            intptr_t token_pos = descriptors.TokenPos(j);
+            intptr_t line = -1;
+            intptr_t col = -1;
+            script.GetTokenLocation(token_pos, &line, &col);
+            // OS::Print("  %s -> %"Pd" @ %"Pd" %"Pd"\n",
+            //           ic_data.ToCString(),
+            //           ic_data.AggregateCount(),
+            //           token_pos, line);
+            JSONObject ic_info(jsarr);
+            ic_info.AddProperty("line", line);
+            ic_info.AddProperty("col", col);
+            ic_info.AddProperty("count", ic_data.AggregateCount());
+          }
+        }
+      }
+    }
+  }
+}
+
+
+void CodeCoverage::Print(Isolate* isolate) {
+  JSONStream stream;
+
+  {
+    const GrowableObjectArray& libs = GrowableObjectArray::Handle(
+        isolate, isolate->object_store()->libraries());
+    Library& lib = Library::Handle();
+    Class& cls = Class::Handle();
+    JSONArray jsarr(&stream);
+    for (int i = 0; i < libs.Length(); i++) {
+      lib ^= libs.At(i);
+      ClassDictionaryIterator it(lib, ClassDictionaryIterator::kIteratePrivate);
+      while (it.HasNext()) {
+        cls = it.GetNextClass();
+        if (cls.is_finalized()) {
+          // Only classes that have been finalized do have a meaningful list of
+          // functions.
+          PrintClass(cls, jsarr);
+        }
+      }
+    }
+  }
+
+  OS::Print("### COVERAGE DATA ###\n"
+            "%s\n"
+            "### END ###\n", stream.ToCString());
+}
+
+}  // namespace dart