Heap profiler: count the number of back references for objects.

src/log-utils.cc

Index: src/log-utils.cc
diff --git a/src/log-utils.cc b/src/log-utils.cc
index b31864be4695c752ebe210ad1ac77282c377a855..f280bfbe28a2a3ecc853cf5620b1a42d39fca5a0 100644
--- a/src/log-utils.cc
+++ b/src/log-utils.cc
@@ -310,6 +310,18 @@ void LogMessageBuilder::AppendDetailed(String* str, bool show_impl_info) {
 }
 
 
+void LogMessageBuilder::AppendStringPart(const char* str, int len) {
+  if (pos_ + len > Log::kMessageBufferSize) {
+    len = Log::kMessageBufferSize - pos_;
+    ASSERT(len >= 0);
+    if (len == 0) return;
+  }
+  strncpy(Log::message_buffer_ + pos_, str, len);
+  pos_ += len;
+  ASSERT(pos_ <= Log::kMessageBufferSize);
+}
+
+
 bool LogMessageBuilder::StoreInCompressor(LogRecordCompressor* compressor) {
   return compressor->Store(Vector<const char>(Log::message_buffer_, pos_));
 }