Extend CPU profiler with mapping ticks to source lines

src/profile-generator-inl.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_PROFILE_GENERATOR_INL_H_
 #define V8_PROFILE_GENERATOR_INL_H_
 
 #include "src/profile-generator.h"
 
 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)
+                     int column_number,
+                     JITLineInfoTable* line_info)
     : tag_(tag),
       builtin_id_(Builtins::builtin_count),
       name_prefix_(name_prefix),
       name_(name),
       resource_name_(resource_name),
       line_number_(line_number),
       column_number_(column_number),
       shared_id_(0),
       script_id_(v8::UnboundScript::kNoScriptId),
       no_frame_ranges_(NULL),
-      bailout_reason_(kEmptyBailoutReason) { }
+      bailout_reason_(kEmptyBailoutReason) {
+    if (NULL != line_info) {

[alph, 2014/07/29 12:55:56]

style nit: NULL to the right hand side

+      line_info_ = *line_info;
+    }
+}
 
 
 bool CodeEntry::is_js_function_tag(Logger::LogEventsAndTags tag) {
   return tag == Logger::FUNCTION_TAG
       || tag == Logger::LAZY_COMPILE_TAG
       || tag == Logger::SCRIPT_TAG
       || tag == Logger::NATIVE_FUNCTION_TAG
       || tag == Logger::NATIVE_LAZY_COMPILE_TAG
       || tag == Logger::NATIVE_SCRIPT_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_