Abcd for performance check.

src/hydrogen.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 51 matching lines @@
   void set_block_id(int id) { block_id_ = id; }
   HGraph* graph() const { return graph_; }
   Isolate* isolate() const;
   const ZoneList<HPhi*>* phis() const { return &phis_; }
   HInstruction* first() const { return first_; }
   HInstruction* last() const { return last_; }
   void set_last(HInstruction* instr) { last_ = instr; }
   HInstruction* GetLastInstruction();
   HControlInstruction* end() const { return end_; }
   HLoopInformation* loop_information() const { return loop_information_; }
+  HLoopInformation* current_loop() const {
+    return IsLoopHeader() ? loop_information()
+                          : (parent_loop_header() != NULL
+                            ? parent_loop_header()->loop_information() : NULL);
+  }
   const ZoneList<HBasicBlock*>* predecessors() const { return &predecessors_; }
   bool HasPredecessor() const { return predecessors_.length() > 0; }
   const ZoneList<HBasicBlock*>* dominated_blocks() const {
     return &dominated_blocks_;
   }
   const ZoneList<int>* deleted_phis() const {
     return &deleted_phis_;
   }
   void RecordDeletedPhi(int merge_index) {
     deleted_phis_.Add(merge_index, zone());
@@ skipping 132 matching lines @@
   int current_;
 };
 
 
 class HLoopInformation: public ZoneObject {
  public:
   HLoopInformation(HBasicBlock* loop_header, Zone* zone)
       : back_edges_(4, zone),
         loop_header_(loop_header),
         blocks_(8, zone),
-        stack_check_(NULL) {
+        stack_check_(NULL),
+        exits_count_(0) {
     blocks_.Add(loop_header, zone);
   }
   virtual ~HLoopInformation() {}
 
   const ZoneList<HBasicBlock*>* back_edges() const { return &back_edges_; }
   const ZoneList<HBasicBlock*>* blocks() const { return &blocks_; }
   HBasicBlock* loop_header() const { return loop_header_; }
   HBasicBlock* GetLastBackEdge() const;
   void RegisterBackEdge(HBasicBlock* block);
 
   HStackCheck* stack_check() const { return stack_check_; }
   void set_stack_check(HStackCheck* stack_check) {
     stack_check_ = stack_check;
   }
 
+  int exits_count() { return exits_count_; }
+  HLoopInformation* parent_loop() {
+    HBasicBlock* parent_header = loop_header()->parent_loop_header();
+    return parent_header != NULL ? parent_header->loop_information() : NULL;
+  }
+  bool IsInThisLoop(HLoopInformation* other) {

[Jakob Kummerow, 2013/04/17 11:34:15]

I'd rename this to IsNestedInThisLoop (or just IsNested).

[Massi, 2013/05/07 11:32:03]

Done.

+    while (other != NULL) {
+      if (other == this) {
+        return true;
+      }
+      other = other->parent_loop();
+    }
+    return false;
+  }
+  void ProcessEdge(HBasicBlock* destination);
+  void ProcessThrow();
+
  private:
   void AddBlock(HBasicBlock* block);
 
   ZoneList<HBasicBlock*> back_edges_;
   HBasicBlock* loop_header_;
   ZoneList<HBasicBlock*> blocks_;
   HStackCheck* stack_check_;
+  int exits_count_;
 };
 
 class BoundsCheckTable;
 class HGraph: public ZoneObject {
  public:
   explicit HGraph(CompilationInfo* info);
 
   Isolate* isolate() const { return isolate_; }
   Zone* zone() const { return zone_; }
   CompilationInfo* info() const { return info_; }
@@ skipping 1535 matching lines @@
   EmbeddedVector<char, 64> filename_;
   HeapStringAllocator string_allocator_;
   StringStream trace_;
   int indent_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_