Add tracking of loop nesting to ARM code.

src/arm/codegen-arm.h

 // Copyright 2010 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 197 matching lines @@
   inline Scope* scope();
 
   // Generating deferred code.
   void ProcessDeferred();
 
   // State
   bool has_cc() const  { return cc_reg_ != al; }
   JumpTarget* true_target() const  { return state_->true_target(); }
   JumpTarget* false_target() const  { return state_->false_target(); }
 
-  // We don't track loop nesting level on ARM yet.
-  int loop_nesting() const { return 0; }
+  // Track loop nesting level.
+  int loop_nesting() const { return loop_nesting_; }
+  void IncrementLoopNesting() { loop_nesting_++; }
+  void DecrementLoopNesting() { loop_nesting_--; }
 
   // Node visitors.
   void VisitStatements(ZoneList<Statement*>* statements);
 
 #define DEF_VISIT(type) \
   void Visit##type(type* node);
   AST_NODE_LIST(DEF_VISIT)
 #undef DEF_VISIT
 
   // Visit a statement and then spill the virtual frame if control flow can
@@ skipping 47 matching lines @@
   // unconditional jumps to the control targets).
   inline void LoadConditionAndSpill(Expression* expression,
                                     JumpTarget* true_target,
                                     JumpTarget* false_target,
                                     bool force_control);
 
   // Read a value from a slot and leave it on top of the expression stack.
   void LoadFromSlot(Slot* slot, TypeofState typeof_state);
   // Store the value on top of the stack to a slot.
   void StoreToSlot(Slot* slot, InitState init_state);
+
   // Load a keyed property, leaving it in r0.  The receiver and key are
   // passed on the stack, and remain there.
   void EmitKeyedLoad(bool is_global);
 
   void LoadFromGlobalSlotCheckExtensions(Slot* slot,
                                          TypeofState typeof_state,
                                          Register tmp,
                                          Register tmp2,
                                          JumpTarget* slow);
 
@@ skipping 154 matching lines @@
   // Assembler
   MacroAssembler* masm_;  // to generate code
 
   CompilationInfo* info_;
 
   // Code generation state
   VirtualFrame* frame_;
   RegisterAllocator* allocator_;
   Condition cc_reg_;
   CodeGenState* state_;
+  int loop_nesting_;
 
   // Jump targets
   BreakTarget function_return_;
 
   // True if the function return is shadowed (ie, jumping to the target
   // function_return_ does not jump to the true function return, but rather
   // to some unlinking code).
   bool function_return_is_shadowed_;
 
   static InlineRuntimeLUT kInlineRuntimeLUT[];
@@ skipping 342 matching lines @@
   void Print() {
     PrintF("NumberToStringStub\n");
   }
 #endif
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_CODEGEN_ARM_H_