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 68a565c73a2ffa4469948a1aa36b52e565f6947a..2cb855aa91d1bdc242c43bcee6ceed02fafc9207 100644
--- a/src/cpu-profiler.cc
+++ b/src/cpu-profiler.cc
@@ -201,7 +201,10 @@ void CpuProfiler::CodeCreateEvent(Logger::LogEventsAndTags tag,
   CodeEventsContainer evt_rec(CodeEventRecord::CODE_CREATION);
   CodeCreateEventRecord* rec = &evt_rec.CodeCreateEventRecord_;
   rec->start = code->address();
-  rec->entry = profiles_->NewCodeEntry(tag, profiles_->GetFunctionName(name));
+  rec->entry = profiles_->NewCodeEntry(
+      tag, profiles_->GetFunctionName(name), CodeEntry::kEmptyNamePrefix,
+      CodeEntry::kEmptyResourceName, CpuProfileNode::kNoLineNumberInfo,
+      CpuProfileNode::kNoColumnNumberInfo, NULL, code->instruction_start());
   rec->size = code->ExecutableSize();
   rec->shared = NULL;
   processor_->Enqueue(evt_rec);
@@ -215,7 +218,10 @@ void CpuProfiler::CodeCreateEvent(Logger::LogEventsAndTags tag,
   CodeEventsContainer evt_rec(CodeEventRecord::CODE_CREATION);
   CodeCreateEventRecord* rec = &evt_rec.CodeCreateEventRecord_;
   rec->start = code->address();
-  rec->entry = profiles_->NewCodeEntry(tag, profiles_->GetFunctionName(name));
+  rec->entry = profiles_->NewCodeEntry(
+      tag, profiles_->GetFunctionName(name), CodeEntry::kEmptyNamePrefix,
+      CodeEntry::kEmptyResourceName, CpuProfileNode::kNoLineNumberInfo,
+      CpuProfileNode::kNoColumnNumberInfo, NULL, code->instruction_start());
   rec->size = code->ExecutableSize();
   rec->shared = NULL;
   processor_->Enqueue(evt_rec);
@@ -231,7 +237,9 @@ void CpuProfiler::CodeCreateEvent(Logger::LogEventsAndTags tag, Code* code,
   rec->start = code->address();
   rec->entry = profiles_->NewCodeEntry(
       tag, profiles_->GetFunctionName(shared->DebugName()),
-      CodeEntry::kEmptyNamePrefix, profiles_->GetName(script_name));
+      CodeEntry::kEmptyNamePrefix, profiles_->GetName(script_name),
+      CpuProfileNode::kNoLineNumberInfo, CpuProfileNode::kNoColumnNumberInfo,
+      NULL, code->instruction_start());
   if (info) {
     rec->entry->set_no_frame_ranges(info->ReleaseNoFrameRanges());
   }
@@ -256,15 +264,29 @@ void CpuProfiler::CodeCreateEvent(Logger::LogEventsAndTags tag, Code* code,
   CodeEventsContainer evt_rec(CodeEventRecord::CODE_CREATION);
   CodeCreateEventRecord* rec = &evt_rec.CodeCreateEventRecord_;
   rec->start = code->address();
+  Script* script = Script::cast(shared->script());
+  JITLineInfoTable* line_table = NULL;
+  if (script) {
+    line_table = new JITLineInfoTable();
+    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(script_name), line,
-      column);
+      column, line_table, code->instruction_start());
   if (info) {
     rec->entry->set_no_frame_ranges(info->ReleaseNoFrameRanges());
   }
-  DCHECK(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();
@@ -282,9 +304,9 @@ void CpuProfiler::CodeCreateEvent(Logger::LogEventsAndTags tag,
   CodeCreateEventRecord* rec = &evt_rec.CodeCreateEventRecord_;
   rec->start = code->address();
   rec->entry = profiles_->NewCodeEntry(
-      tag,
-      profiles_->GetName(args_count),
-      "args_count: ");
+      tag, profiles_->GetName(args_count), "args_count: ",
+      CodeEntry::kEmptyResourceName, CpuProfileNode::kNoLineNumberInfo,
+      CpuProfileNode::kNoColumnNumberInfo, NULL, code->instruction_start());
   rec->size = code->ExecutableSize();
   rec->shared = NULL;
   processor_->Enqueue(evt_rec);
@@ -344,9 +366,9 @@ void CpuProfiler::RegExpCodeCreateEvent(Code* code, String* source) {
   CodeCreateEventRecord* rec = &evt_rec.CodeCreateEventRecord_;
   rec->start = code->address();
   rec->entry = profiles_->NewCodeEntry(
-      Logger::REG_EXP_TAG,
-      profiles_->GetName(source),
-      "RegExp: ");
+      Logger::REG_EXP_TAG, profiles_->GetName(source), "RegExp: ",
+      CodeEntry::kEmptyResourceName, CpuProfileNode::kNoLineNumberInfo,
+      CpuProfileNode::kNoColumnNumberInfo, NULL, code->instruction_start());
   rec->size = code->ExecutableSize();
   processor_->Enqueue(evt_rec);
 }