Extend CPU profiler with mapping ticks to source lines

src/profile-generator-inl.h

Index: src/profile-generator-inl.h
diff --git a/src/profile-generator-inl.h b/src/profile-generator-inl.h
index 58c124fe62b85e4f87cc9603c490b0141a8779da..c3ffb268ed8e38c42bfabf4a3ccdc6f76b890583 100644
--- a/src/profile-generator-inl.h
+++ b/src/profile-generator-inl.h
@@ -10,12 +10,10 @@
 namespace v8 {
 namespace internal {
 
-CodeEntry::CodeEntry(Logger::LogEventsAndTags tag,
-                     const char* name,
-                     const char* name_prefix,
-                     const char* resource_name,
-                     int line_number,
-                     int column_number)
+CodeEntry::CodeEntry(Logger::LogEventsAndTags tag, const char* name,
+                     const char* name_prefix, const char* resource_name,
+                     int line_number, int column_number,
+                     JITLineInfoTable* line_info, Address instruction_start)
     : tag_(tag),
       builtin_id_(Builtins::builtin_count),
       name_prefix_(name_prefix),
@@ -26,7 +24,9 @@ CodeEntry::CodeEntry(Logger::LogEventsAndTags tag,
       shared_id_(0),
       script_id_(v8::UnboundScript::kNoScriptId),
       no_frame_ranges_(NULL),
-      bailout_reason_(kEmptyBailoutReason) { }
+      bailout_reason_(kEmptyBailoutReason),
+      line_info_(line_info),
+      instruction_start_(instruction_start) {}
 
 
 bool CodeEntry::is_js_function_tag(Logger::LogEventsAndTags tag) {
@@ -39,13 +39,16 @@ bool CodeEntry::is_js_function_tag(Logger::LogEventsAndTags tag) {
 }
 
 
+static bool LineTickMatch(void* a, void* b) { return a == b; }
+
+
 ProfileNode::ProfileNode(ProfileTree* tree, CodeEntry* entry)
     : tree_(tree),
       entry_(entry),
       self_ticks_(0),
       children_(CodeEntriesMatch),
-      id_(tree->next_node_id()) { }
-
+      id_(tree->next_node_id()),
+      line_ticks_(LineTickMatch) {}
 } }  // namespace v8::internal
 
 #endif  // V8_PROFILE_GENERATOR_INL_H_