Extend CPU profiler with mapping ticks to source lines

src/cpu-profiler.cc

Index: src/cpu-profiler.cc
diff --git a/src/cpu-profiler.cc b/src/cpu-profiler.cc
index 54fec77a2a3a3b6f087ffd546ba5cd1221546321..b9c63bd9663d80f75e142477405a687ee8cf7677 100644
--- a/src/cpu-profiler.cc
+++ b/src/cpu-profiler.cc
@@ -257,18 +257,35 @@ void CpuProfiler::CodeCreateEvent(Logger::LogEventsAndTags tag,
   CodeEventsContainer evt_rec(CodeEventRecord::CODE_CREATION);
   CodeCreateEventRecord* rec = &evt_rec.CodeCreateEventRecord_;
   rec->start = code->address();
+  ASSERT(Script::cast(shared->script()));
+  Script* script = Script::cast(shared->script());
+
+  // Get line info from the relocation information.
+  JITLineInfoTable* line_table = new JITLineInfoTable();
+  Handle<Script> script_handle(Script::cast(shared->script()));
+  for (RelocIterator it(code); !it.done(); it.next()) {
+    RelocInfo::Mode mode = it.rinfo()->rmode();
+    if (RelocInfo::IsPosition(mode)) {
+      int position = static_cast<int>(it.rinfo()->data());
+      if (position >= 0) {
+        int pc_offset = static_cast<int>(it.rinfo()->pc() - code->address());
+        int line_number = script->GetLineNumber(position) + 1;
+        line_table->SetPosition(pc_offset, line_number);
+      }
+    }
+  }
+
   rec->entry = profiles_->NewCodeEntry(
       tag,
       profiles_->GetFunctionName(shared->DebugName()),
       CodeEntry::kEmptyNamePrefix,
       profiles_->GetName(source),
       line,
-      column);
+      column,
+      line_table);
   if (info) {
     rec->entry->set_no_frame_ranges(info->ReleaseNoFrameRanges());
   }
-  ASSERT(Script::cast(shared->script()));
-  Script* script = Script::cast(shared->script());
   rec->entry->set_script_id(script->id()->value());
   rec->size = code->ExecutableSize();
   rec->shared = shared->address();