Merge the Merlin heap tracing to top-of-trunk.

runtime/vm/heap_trace_test.cc

+// Copyright 2012 Google Inc. All Rights Reserved.
+// Author: nricci@google.com (Nathan Ricci)
+//
+#include <sstream>
+#include <iostream>
+#include <string>
+#include "vm/growable_array.h"
+#include "vm/heap_trace.h"
+#include "vm/unit_test.h"
+#include "vm/heap.h"
+#include "vm/dart_api_impl.h"
+
+
+namespace dart {
+
+static std::stringstream* the_stream;
+
+static void* OpenTraceFile(const char* name) {
+  return reinterpret_cast<void*>(the_stream);
+}
+
+
+static void WriteToTraceFile(const void* buffer,
+                             intptr_t num_bytes,
+                             void* stream) {
+  std::stringstream* s_stream = (std::stringstream*)stream;
+  s_stream->write(reinterpret_cast<const char*>(buffer), num_bytes);
+}
+
+
+static void CloseTraceFile(void *stream) {
+}
+
+
+bool DoesAllocationRecordExist(uword addr, std::string trace_string) {
+  const char* raw_trace = trace_string.c_str();
+  for (unsigned int i = 0; i < trace_string.length(); i++) {
+    if (raw_trace[i] == 'A' && i + 4 < trace_string.length()) {
+      const uword candidate_address =
+          *(reinterpret_cast<const uword*>(raw_trace+i+1));
+      if (candidate_address == addr) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
+
+bool DoesSweepRecordExist(uword addr, std::string trace_string) {
+  const char* raw_trace = trace_string.c_str();
+  for (unsigned int i = 0; i < trace_string.length(); i++) {
+    if (raw_trace[i] == 'S' && i + 4 < trace_string.length()) {
+      const uword candidate_address =
+          *(reinterpret_cast<const uword*>(raw_trace+i+1));
+      if (candidate_address == addr) {
+        return true;
+      }
+    }
+  }
+  return false;
+}
+
+
+TEST_CASE(GCTraceAllocate) {
+  const int kArrayLen = 5;
+  the_stream = new std::stringstream();
+  HeapTrace::InitTracing(OpenTraceFile
+                         , WriteToTraceFile
+                         , CloseTraceFile
+                         , "test_prefix");
+
+  Isolate* isolate = Isolate::Current();
+  isolate->heap()->trace()->InitializeIsolateTracing(isolate);
+
+  RawArray* raw_arr = Array::New(kArrayLen);
+  uword addr = RawObject::ToAddr(raw_arr);
+
+
+  ASSERT(DoesAllocationRecordExist(addr, the_stream->str()));
+  delete the_stream;
+}
+
+TEST_CASE(GCTraceSweep) {
+  the_stream = new std::stringstream();
+  const int kArrayLen = 5;
+
+  HeapTrace::InitTracing(OpenTraceFile,
+                         WriteToTraceFile,
+                         CloseTraceFile,
+                         "test_prefix");
+
+
+  Isolate* isolate = Isolate::Current();
+  isolate->heap()->trace()->InitializeIsolateTracing(isolate);
+
+  RawArray* raw_arr = Array::New(kArrayLen, Heap::kOld);
+  uword addr = RawObject::ToAddr(raw_arr);
+
+  Isolate::Current()->heap()->CollectGarbage(Heap::kOld);
+  DoesSweepRecordExist(addr, the_stream->str());
+  delete the_stream;
+}
+
+
+}  // namespace dart