Enable stub generation using Hydrogen/Lithium (again)

src/hydrogen.cc

 // 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 120 matching lines @@
 
   return instr;
 }
 
 
 HSimulate* HBasicBlock::CreateSimulate(BailoutId ast_id,
                                        RemovableSimulate removable) {
   ASSERT(HasEnvironment());
   HEnvironment* environment = last_environment();
   ASSERT(ast_id.IsNone() ||
+         ast_id == BailoutId::StubEntry() ||
          environment->closure()->shared()->VerifyBailoutId(ast_id));
 
   int push_count = environment->push_count();
   int pop_count = environment->pop_count();
 
   HSimulate* instr =
       new(zone()) HSimulate(ast_id, pop_count, zone(), removable);
   // Order of pushed values: newest (top of stack) first. This allows
   // HSimulate::MergeInto() to easily append additional pushed values
   // that are older (from further down the stack).
@@ skipping 463 matching lines @@
 HConstant* HGraph::GetConstantFalse() {
   return GetConstant(&constant_false_, isolate()->factory()->false_value());
 }
 
 
 HConstant* HGraph::GetConstantHole() {
   return GetConstant(&constant_hole_, isolate()->factory()->the_hole_value());
 }
 
 
-HGraphBuilder::HGraphBuilder(CompilationInfo* info,
-                             TypeFeedbackOracle* oracle)
-    : function_state_(NULL),
+HGraph* HGraphBuilder::CreateGraph() {
+  graph_ = new(zone()) HGraph(info_);
+  if (FLAG_hydrogen_stats) HStatistics::Instance()->Initialize(info_);
+  HPhase phase("H_Block building");
+  set_current_block(graph()->entry_block());
+  if (!BuildGraph()) return NULL;
+  return graph_;
+}
+
+
+HInstruction* HGraphBuilder::AddInstruction(HInstruction* instr) {
+  ASSERT(current_block() != NULL);
+  current_block()->AddInstruction(instr);
+  return instr;
+}
+
+
+void HGraphBuilder::AddSimulate(BailoutId id,
+                                RemovableSimulate removable) {
+  ASSERT(current_block() != NULL);
+  current_block()->AddSimulate(id, removable);
+}
+
+
+HInstruction* HGraphBuilder::BuildExternalArrayElementAccess(
+    HValue* external_elements,
+    HValue* checked_key,
+    HValue* val,
+    HValue* dependency,
+    ElementsKind elements_kind,
+    bool is_store) {
+  Zone* zone = this->zone();
+  if (is_store) {
+    ASSERT(val != NULL);
+    switch (elements_kind) {
+      case EXTERNAL_PIXEL_ELEMENTS: {
+        val = AddInstruction(new(zone) HClampToUint8(val));
+        break;
+      }
+      case EXTERNAL_BYTE_ELEMENTS:
+      case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
+      case EXTERNAL_SHORT_ELEMENTS:
+      case EXTERNAL_UNSIGNED_SHORT_ELEMENTS:
+      case EXTERNAL_INT_ELEMENTS:
+      case EXTERNAL_UNSIGNED_INT_ELEMENTS: {
+        break;
+      }
+      case EXTERNAL_FLOAT_ELEMENTS:
+      case EXTERNAL_DOUBLE_ELEMENTS:
+        break;
+      case FAST_SMI_ELEMENTS:
+      case FAST_ELEMENTS:
+      case FAST_DOUBLE_ELEMENTS:
+      case FAST_HOLEY_SMI_ELEMENTS:
+      case FAST_HOLEY_ELEMENTS:
+      case FAST_HOLEY_DOUBLE_ELEMENTS:
+      case DICTIONARY_ELEMENTS:
+      case NON_STRICT_ARGUMENTS_ELEMENTS:
+        UNREACHABLE();
+        break;
+    }
+    return new(zone) HStoreKeyed(external_elements, checked_key,
+                                 val, elements_kind);
+  } else {
+    ASSERT(val == NULL);
+    HLoadKeyed* load =
+       new(zone) HLoadKeyed(
+           external_elements, checked_key, dependency, elements_kind);
+    if (FLAG_opt_safe_uint32_operations &&
+        elements_kind == EXTERNAL_UNSIGNED_INT_ELEMENTS) {
+      graph()->RecordUint32Instruction(load);
+    }
+    return load;
+  }
+}
+
+
+HInstruction* HGraphBuilder::BuildFastElementAccess(
+    HValue* elements,
+    HValue* checked_key,
+    HValue* val,
+    HValue* load_dependency,
+    ElementsKind elements_kind,
+    bool is_store) {
+  Zone* zone = this->zone();
+  if (is_store) {
+    ASSERT(val != NULL);
+    switch (elements_kind) {
+      case FAST_SMI_ELEMENTS:
+      case FAST_HOLEY_SMI_ELEMENTS:
+        // Smi-only arrays need a smi check.
+        AddInstruction(new(zone) HCheckSmi(val));
+        // Fall through.
+      case FAST_ELEMENTS:
+      case FAST_HOLEY_ELEMENTS:
+      case FAST_DOUBLE_ELEMENTS:
+      case FAST_HOLEY_DOUBLE_ELEMENTS:
+        return new(zone) HStoreKeyed(elements, checked_key, val, elements_kind);
+      default:
+        UNREACHABLE();
+        return NULL;
+    }
+  }
+  // It's an element load (!is_store).
+  return new(zone) HLoadKeyed(elements,
+                              checked_key,
+                              load_dependency,
+                              elements_kind);
+}
+
+
+HInstruction* HGraphBuilder::BuildUncheckedMonomorphicElementAccess(
+    HValue* object,
+    HValue* key,
+    HValue* val,
+    HCheckMaps* mapcheck,
+    bool is_js_array,
+    ElementsKind elements_kind,
+    bool is_store) {
+  Zone* zone = this->zone();
+  // No GVNFlag is necessary for ElementsKind if there is an explicit dependency
+  // on a HElementsTransition instruction. The flag can also be removed if the
+  // map to check has FAST_HOLEY_ELEMENTS, since there can be no further
+  // ElementsKind transitions. Finally, the dependency can be removed for stores
+  // for FAST_ELEMENTS, since a transition to HOLEY elements won't change the
+  // generated store code.
+  if ((elements_kind == FAST_HOLEY_ELEMENTS) ||
+      (elements_kind == FAST_ELEMENTS && is_store)) {
+    if (mapcheck != NULL) {
+      mapcheck->ClearGVNFlag(kDependsOnElementsKind);
+    }
+  }
+  bool fast_smi_only_elements = IsFastSmiElementsKind(elements_kind);
+  bool fast_elements = IsFastObjectElementsKind(elements_kind);
+  HInstruction* elements =
+      AddInstruction(new(zone) HLoadElements(object, mapcheck));
+  if (is_store && (fast_elements || fast_smi_only_elements)) {
+    HCheckMaps* check_cow_map = new(zone) HCheckMaps(
+        elements, Isolate::Current()->factory()->fixed_array_map(), zone);
+    check_cow_map->ClearGVNFlag(kDependsOnElementsKind);
+    AddInstruction(check_cow_map);
+  }
+  HInstruction* length = NULL;
+  HInstruction* checked_key = NULL;
+  if (IsExternalArrayElementsKind(elements_kind)) {
+    length = AddInstruction(new(zone) HFixedArrayBaseLength(elements));
+    checked_key = AddInstruction(new(zone) HBoundsCheck(key, length,
+                                                        ALLOW_SMI_KEY));
+    HLoadExternalArrayPointer* external_elements =
+        new(zone) HLoadExternalArrayPointer(elements);
+    AddInstruction(external_elements);
+    return BuildExternalArrayElementAccess(
+        external_elements, checked_key, val, mapcheck,
+        elements_kind, is_store);
+  }
+  ASSERT(fast_smi_only_elements ||
+         fast_elements ||
+         IsFastDoubleElementsKind(elements_kind));
+  if (is_js_array) {
+    length = AddInstruction(new(zone) HJSArrayLength(object, mapcheck,
+                                                     HType::Smi()));
+  } else {
+    length = AddInstruction(new(zone) HFixedArrayBaseLength(elements));
+  }
+  checked_key = AddInstruction(new(zone) HBoundsCheck(key, length,
+                                                      ALLOW_SMI_KEY));
+  return BuildFastElementAccess(elements, checked_key, val, mapcheck,
+                                elements_kind, is_store);
+}
+
+
+HOptimizedGraphBuilder::HOptimizedGraphBuilder(CompilationInfo* info,
+                                               TypeFeedbackOracle* oracle)
+    : HGraphBuilder(info),
+      function_state_(NULL),
       initial_function_state_(this, info, oracle, NORMAL_RETURN),
       ast_context_(NULL),
       break_scope_(NULL),
-      graph_(NULL),
-      current_block_(NULL),
       inlined_count_(0),
       globals_(10, info->zone()),
-      zone_(info->zone()),
       inline_bailout_(false) {
   // This is not initialized in the initializer list because the
   // constructor for the initial state relies on function_state_ == NULL
   // to know it's the initial state.
   function_state_= &initial_function_state_;
-}
-
-HBasicBlock* HGraphBuilder::CreateJoin(HBasicBlock* first,
-                                       HBasicBlock* second,
-                                       BailoutId join_id) {
+  InitializeAstVisitor();
+}
+
+
+HBasicBlock* HOptimizedGraphBuilder::CreateJoin(HBasicBlock* first,
+                                                HBasicBlock* second,
+                                                BailoutId join_id) {
   if (first == NULL) {
     return second;
   } else if (second == NULL) {
     return first;
   } else {
-    HBasicBlock* join_block = graph_->CreateBasicBlock();
+    HBasicBlock* join_block = graph()->CreateBasicBlock();
     first->Goto(join_block);
     second->Goto(join_block);
     join_block->SetJoinId(join_id);
     return join_block;
   }
 }
 
 
-HBasicBlock* HGraphBuilder::JoinContinue(IterationStatement* statement,
-                                         HBasicBlock* exit_block,
-                                         HBasicBlock* continue_block) {
+HBasicBlock* HOptimizedGraphBuilder::JoinContinue(IterationStatement* statement,
+                                                  HBasicBlock* exit_block,
+                                                  HBasicBlock* continue_block) {
   if (continue_block != NULL) {
     if (exit_block != NULL) exit_block->Goto(continue_block);
     continue_block->SetJoinId(statement->ContinueId());
     return continue_block;
   }
   return exit_block;
 }
 
 
-HBasicBlock* HGraphBuilder::CreateLoop(IterationStatement* statement,
-                                       HBasicBlock* loop_entry,
-                                       HBasicBlock* body_exit,
-                                       HBasicBlock* loop_successor,
-                                       HBasicBlock* break_block) {
+HBasicBlock* HOptimizedGraphBuilder::CreateLoop(IterationStatement* statement,
+                                                HBasicBlock* loop_entry,
+                                                HBasicBlock* body_exit,
+                                                HBasicBlock* loop_successor,
+                                                HBasicBlock* break_block) {
   if (body_exit != NULL) body_exit->Goto(loop_entry);
   loop_entry->PostProcessLoopHeader(statement);
   if (break_block != NULL) {
     if (loop_successor != NULL) loop_successor->Goto(break_block);
     break_block->SetJoinId(statement->ExitId());
     return break_block;
   }
   return loop_successor;
 }
 
@@ skipping 10 matching lines @@
       entry_block_(NULL),
       blocks_(8, info->zone()),
       values_(16, info->zone()),
       phi_list_(NULL),
       uint32_instructions_(NULL),
       info_(info),
       zone_(info->zone()),
       is_recursive_(false),
       use_optimistic_licm_(false),
       type_change_checksum_(0) {
-  start_environment_ =
-      new(zone_) HEnvironment(NULL, info->scope(), info->closure(), zone_);
+  if (info->IsStub()) {
+    start_environment_ =
+        new(zone_) HEnvironment(zone_);
+  } else {
+    start_environment_ =
+        new(zone_) HEnvironment(NULL, info->scope(), info->closure(), zone_);
+  }
   start_environment_->set_ast_id(BailoutId::FunctionEntry());
   entry_block_ = CreateBasicBlock();
   entry_block_->SetInitialEnvironment(start_environment_);
 }
 
 
 HBasicBlock* HGraph::CreateBasicBlock() {
   HBasicBlock* result = new(zone()) HBasicBlock(this);
   blocks_.Add(result, zone());
   return result;
@@ skipping 2168 matching lines @@
           visited.Clear();
         }
       }
     }
   }
 }
 
 
 // Implementation of utility class to encapsulate the translation state for
 // a (possibly inlined) function.
-FunctionState::FunctionState(HGraphBuilder* owner,
+FunctionState::FunctionState(HOptimizedGraphBuilder* owner,
                              CompilationInfo* info,
                              TypeFeedbackOracle* oracle,
                              InliningKind inlining_kind)
     : owner_(owner),
       compilation_info_(info),
       oracle_(oracle),
       call_context_(NULL),
       inlining_kind_(inlining_kind),
       function_return_(NULL),
       test_context_(NULL),
@@ skipping 28 matching lines @@
 
 
 FunctionState::~FunctionState() {
   delete test_context_;
   owner_->set_function_state(outer_);
 }
 
 
 // Implementation of utility classes to represent an expression's context in
 // the AST.
-AstContext::AstContext(HGraphBuilder* owner, Expression::Context kind)
+AstContext::AstContext(HOptimizedGraphBuilder* owner, Expression::Context kind)
     : owner_(owner),
       kind_(kind),
       outer_(owner->ast_context()),
       for_typeof_(false) {
   owner->set_ast_context(this);  // Push.
 #ifdef DEBUG
   ASSERT(owner->environment()->frame_type() == JS_FUNCTION);
   original_length_ = owner->environment()->length();
 #endif
 }
@@ skipping 90 matching lines @@
   owner()->set_current_block(materialize_false);
   owner()->Push(owner()->graph()->GetConstantFalse());
   HBasicBlock* join =
     owner()->CreateJoin(materialize_true, materialize_false, ast_id);
   owner()->set_current_block(join);
 }
 
 
 void TestContext::ReturnInstruction(HInstruction* instr, BailoutId ast_id) {
   ASSERT(!instr->IsControlInstruction());
-  HGraphBuilder* builder = owner();
+  HOptimizedGraphBuilder* builder = owner();
   builder->AddInstruction(instr);
   // We expect a simulate after every expression with side effects, though
   // this one isn't actually needed (and wouldn't work if it were targeted).
   if (instr->HasObservableSideEffects()) {
     builder->Push(instr);
     builder->AddSimulate(ast_id, REMOVABLE_SIMULATE);
     builder->Pop();
   }
   BuildBranch(instr);
 }
@@ skipping 10 matching lines @@
   empty_false->Goto(if_false(), owner()->function_state());
   owner()->set_current_block(NULL);
 }
 
 
 void TestContext::BuildBranch(HValue* value) {
   // We expect the graph to be in edge-split form: there is no edge that
   // connects a branch node to a join node.  We conservatively ensure that
   // property by always adding an empty block on the outgoing edges of this
   // branch.
-  HGraphBuilder* builder = owner();
+  HOptimizedGraphBuilder* builder = owner();
   if (value != NULL && value->CheckFlag(HValue::kIsArguments)) {
     builder->Bailout("arguments object value in a test context");
   }
   HBasicBlock* empty_true = builder->graph()->CreateBasicBlock();
   HBasicBlock* empty_false = builder->graph()->CreateBasicBlock();
   TypeFeedbackId test_id = condition()->test_id();
   ToBooleanStub::Types expected(oracle()->ToBooleanTypes(test_id));
   HBranch* test = new(zone()) HBranch(value, empty_true, empty_false, expected);
   builder->current_block()->Finish(test);
 
   empty_true->Goto(if_true(), owner()->function_state());
   empty_false->Goto(if_false(), owner()->function_state());
   builder->set_current_block(NULL);
 }
 
 
-// HGraphBuilder infrastructure for bailing out and checking bailouts.
+// HOptimizedGraphBuilder infrastructure for bailing out and checking bailouts.
 #define CHECK_BAILOUT(call)                     \
   do {                                          \
     call;                                       \
     if (HasStackOverflow()) return;             \
   } while (false)
 
 
 #define CHECK_ALIVE(call)                                       \
   do {                                                          \
     call;                                                       \
     if (HasStackOverflow() || current_block() == NULL) return;  \
   } while (false)
 
 
-void HGraphBuilder::Bailout(const char* reason) {
+void HOptimizedGraphBuilder::Bailout(const char* reason) {
   info()->set_bailout_reason(reason);
   SetStackOverflow();
 }
 
 
-void HGraphBuilder::VisitForEffect(Expression* expr) {
+void HOptimizedGraphBuilder::VisitForEffect(Expression* expr) {
   EffectContext for_effect(this);
   Visit(expr);
 }
 
 
-void HGraphBuilder::VisitForValue(Expression* expr, ArgumentsAllowedFlag flag) {
+void HOptimizedGraphBuilder::VisitForValue(Expression* expr,
+                                           ArgumentsAllowedFlag flag) {
   ValueContext for_value(this, flag);
   Visit(expr);
 }
 
 
-void HGraphBuilder::VisitForTypeOf(Expression* expr) {
+void HOptimizedGraphBuilder::VisitForTypeOf(Expression* expr) {
   ValueContext for_value(this, ARGUMENTS_NOT_ALLOWED);
   for_value.set_for_typeof(true);
   Visit(expr);
 }
 
 
 
-void HGraphBuilder::VisitForControl(Expression* expr,
-                                    HBasicBlock* true_block,
-                                    HBasicBlock* false_block) {
+void HOptimizedGraphBuilder::VisitForControl(Expression* expr,
+                                             HBasicBlock* true_block,
+                                             HBasicBlock* false_block) {
   TestContext for_test(this, expr, oracle(), true_block, false_block);
   Visit(expr);
 }
 
 
-void HGraphBuilder::VisitArgument(Expression* expr) {
+void HOptimizedGraphBuilder::VisitArgument(Expression* expr) {
   CHECK_ALIVE(VisitForValue(expr));
   Push(AddInstruction(new(zone()) HPushArgument(Pop())));
 }
 
 
-void HGraphBuilder::VisitArgumentList(ZoneList<Expression*>* arguments) {
+void HOptimizedGraphBuilder::VisitArgumentList(
+    ZoneList<Expression*>* arguments) {
   for (int i = 0; i < arguments->length(); i++) {
     CHECK_ALIVE(VisitArgument(arguments->at(i)));
   }
 }
 
 
-void HGraphBuilder::VisitExpressions(ZoneList<Expression*>* exprs) {
+void HOptimizedGraphBuilder::VisitExpressions(
+    ZoneList<Expression*>* exprs) {
   for (int i = 0; i < exprs->length(); ++i) {
     CHECK_ALIVE(VisitForValue(exprs->at(i)));
   }
 }
 
 
-HGraph* HGraphBuilder::CreateGraph() {
-  graph_ = new(zone()) HGraph(info());
-  if (FLAG_hydrogen_stats) HStatistics::Instance()->Initialize(info());
+bool HOptimizedGraphBuilder::BuildGraph() {
+  Scope* scope = info()->scope();
+  if (scope->HasIllegalRedeclaration()) {
+    Bailout("function with illegal redeclaration");
+    return false;
+  }
+  if (scope->calls_eval()) {
+    Bailout("function calls eval");
+    return false;
+  }
+  SetUpScope(scope);
 
-  {
-    HPhase phase("H_Block building");
-    current_block_ = graph()->entry_block();
+  // Add an edge to the body entry.  This is warty: the graph's start
+  // environment will be used by the Lithium translation as the initial
+  // environment on graph entry, but it has now been mutated by the
+  // Hydrogen translation of the instructions in the start block.  This
+  // environment uses values which have not been defined yet.  These
+  // Hydrogen instructions will then be replayed by the Lithium
+  // translation, so they cannot have an environment effect.  The edge to
+  // the body's entry block (along with some special logic for the start
+  // block in HInstruction::InsertAfter) seals the start block from
+  // getting unwanted instructions inserted.
+  //
+  // TODO(kmillikin): Fix this.  Stop mutating the initial environment.
+  // Make the Hydrogen instructions in the initial block into Hydrogen
+  // values (but not instructions), present in the initial environment and
+  // not replayed by the Lithium translation.
+  HEnvironment* initial_env = environment()->CopyWithoutHistory();
+  HBasicBlock* body_entry = CreateBasicBlock(initial_env);
+  current_block()->Goto(body_entry);
+  body_entry->SetJoinId(BailoutId::FunctionEntry());
+  set_current_block(body_entry);
 
-    Scope* scope = info()->scope();
-    if (scope->HasIllegalRedeclaration()) {
-      Bailout("function with illegal redeclaration");
-      return NULL;
-    }
-    if (scope->calls_eval()) {
-      Bailout("function calls eval");
-      return NULL;
-    }
-    SetUpScope(scope);
+  // Handle implicit declaration of the function name in named function
+  // expressions before other declarations.
+  if (scope->is_function_scope() && scope->function() != NULL) {
+    VisitVariableDeclaration(scope->function());
+  }
+  VisitDeclarations(scope->declarations());
+  AddSimulate(BailoutId::Declarations());
 
-    // Add an edge to the body entry.  This is warty: the graph's start
-    // environment will be used by the Lithium translation as the initial
-    // environment on graph entry, but it has now been mutated by the
-    // Hydrogen translation of the instructions in the start block.  This
-    // environment uses values which have not been defined yet.  These
-    // Hydrogen instructions will then be replayed by the Lithium
-    // translation, so they cannot have an environment effect.  The edge to
-    // the body's entry block (along with some special logic for the start
-    // block in HInstruction::InsertAfter) seals the start block from
-    // getting unwanted instructions inserted.
-    //
-    // TODO(kmillikin): Fix this.  Stop mutating the initial environment.
-    // Make the Hydrogen instructions in the initial block into Hydrogen
-    // values (but not instructions), present in the initial environment and
-    // not replayed by the Lithium translation.
-    HEnvironment* initial_env = environment()->CopyWithoutHistory();
-    HBasicBlock* body_entry = CreateBasicBlock(initial_env);
-    current_block()->Goto(body_entry);
-    body_entry->SetJoinId(BailoutId::FunctionEntry());
-    set_current_block(body_entry);
+  HValue* context = environment()->LookupContext();
+  AddInstruction(
+      new(zone()) HStackCheck(context, HStackCheck::kFunctionEntry));
 
-    // Handle implicit declaration of the function name in named function
-    // expressions before other declarations.
-    if (scope->is_function_scope() && scope->function() != NULL) {
-      VisitVariableDeclaration(scope->function());
-    }
-    VisitDeclarations(scope->declarations());
-    AddSimulate(BailoutId::Declarations());
+  VisitStatements(info()->function()->body());
+  if (HasStackOverflow()) return false;
 
-    HValue* context = environment()->LookupContext();
-    AddInstruction(
-        new(zone()) HStackCheck(context, HStackCheck::kFunctionEntry));
-
-    VisitStatements(info()->function()->body());
-    if (HasStackOverflow()) return NULL;
-
-    if (current_block() != NULL) {
-      HReturn* instr = new(zone()) HReturn(graph()->GetConstantUndefined());
-      current_block()->FinishExit(instr);
-      set_current_block(NULL);
-    }
-
-    // If the checksum of the number of type info changes is the same as the
-    // last time this function was compiled, then this recompile is likely not
-    // due to missing/inadequate type feedback, but rather too aggressive
-    // optimization. Disable optimistic LICM in that case.
-    Handle<Code> unoptimized_code(info()->shared_info()->code());
-    ASSERT(unoptimized_code->kind() == Code::FUNCTION);
-    Handle<TypeFeedbackInfo> type_info(
-        TypeFeedbackInfo::cast(unoptimized_code->type_feedback_info()));
-    int checksum = type_info->own_type_change_checksum();
-    int composite_checksum = graph()->update_type_change_checksum(checksum);
-    graph()->set_use_optimistic_licm(
-        !type_info->matches_inlined_type_change_checksum(composite_checksum));
-    type_info->set_inlined_type_change_checksum(composite_checksum);
+  if (current_block() != NULL) {
+    HReturn* instr = new(zone()) HReturn(graph()->GetConstantUndefined());
+    current_block()->FinishExit(instr);
+    set_current_block(NULL);
   }
 
-  return graph();
+  // If the checksum of the number of type info changes is the same as the
+  // last time this function was compiled, then this recompile is likely not
+  // due to missing/inadequate type feedback, but rather too aggressive
+  // optimization. Disable optimistic LICM in that case.
+  Handle<Code> unoptimized_code(info()->shared_info()->code());
+  ASSERT(unoptimized_code->kind() == Code::FUNCTION);
+  Handle<TypeFeedbackInfo> type_info(
+      TypeFeedbackInfo::cast(unoptimized_code->type_feedback_info()));
+  int checksum = type_info->own_type_change_checksum();
+  int composite_checksum = graph()->update_type_change_checksum(checksum);
+  graph()->set_use_optimistic_licm(
+      !type_info->matches_inlined_type_change_checksum(composite_checksum));
+  type_info->set_inlined_type_change_checksum(composite_checksum);
+
+  return true;
 }
 
+
 bool HGraph::Optimize(SmartArrayPointer<char>* bailout_reason) {
   *bailout_reason = SmartArrayPointer<char>();
   OrderBlocks();
   AssignDominators();
 
 #ifdef DEBUG
   // Do a full verify after building the graph and computing dominators.
   Verify(true);
 #endif
 
@@ skipping 503 matching lines @@
     }
     instr->DeleteAndReplaceWith(NULL);
     for (int i = 0; i < instr->OperandCount(); ++i) {
       HValue* operand = instr->OperandAt(i);
       if (operand->IsDead()) worklist.Add(HInstruction::cast(operand), zone());
     }
   }
 }
 
 
-HInstruction* HGraphBuilder::AddInstruction(HInstruction* instr) {
-  ASSERT(current_block() != NULL);
-  current_block()->AddInstruction(instr);
-  return instr;
-}
-
-
-void HGraphBuilder::AddSimulate(BailoutId ast_id, RemovableSimulate removable) {
-  ASSERT(current_block() != NULL);
-  current_block()->AddSimulate(ast_id, removable);
-}
-
-
-void HGraphBuilder::AddPhi(HPhi* instr) {
+void HOptimizedGraphBuilder::AddPhi(HPhi* instr) {
   ASSERT(current_block() != NULL);
   current_block()->AddPhi(instr);
 }
 
 
-void HGraphBuilder::PushAndAdd(HInstruction* instr) {
+void HOptimizedGraphBuilder::PushAndAdd(HInstruction* instr) {
   Push(instr);
   AddInstruction(instr);
 }
 
 
 template <class Instruction>
-HInstruction* HGraphBuilder::PreProcessCall(Instruction* call) {
+HInstruction* HOptimizedGraphBuilder::PreProcessCall(Instruction* call) {
   int count = call->argument_count();
   ZoneList<HValue*> arguments(count, zone());
   for (int i = 0; i < count; ++i) {
     arguments.Add(Pop(), zone());
   }
 
   while (!arguments.is_empty()) {
     AddInstruction(new(zone()) HPushArgument(arguments.RemoveLast()));
   }
   return call;
 }
 
 
-void HGraphBuilder::SetUpScope(Scope* scope) {
+void HOptimizedGraphBuilder::SetUpScope(Scope* scope) {
   HConstant* undefined_constant = new(zone()) HConstant(
       isolate()->factory()->undefined_value(), Representation::Tagged());
   AddInstruction(undefined_constant);
-  graph_->set_undefined_constant(undefined_constant);
+  graph()->set_undefined_constant(undefined_constant);
 
   HArgumentsObject* object = new(zone()) HArgumentsObject;
   AddInstruction(object);
   graph()->SetArgumentsObject(object);
 
   // Set the initial values of parameters including "this".  "This" has
   // parameter index 0.
   ASSERT_EQ(scope->num_parameters() + 1, environment()->parameter_count());
 
   for (int i = 0; i < environment()->parameter_count(); ++i) {
@@ skipping 18 matching lines @@
     if (!scope->arguments()->IsStackAllocated()) {
       return Bailout("context-allocated arguments");
     }
 
     environment()->Bind(scope->arguments(),
                         graph()->GetArgumentsObject());
   }
 }
 
 
-void HGraphBuilder::VisitStatements(ZoneList<Statement*>* statements) {
+void HOptimizedGraphBuilder::VisitStatements(ZoneList<Statement*>* statements) {
   for (int i = 0; i < statements->length(); i++) {
     CHECK_ALIVE(Visit(statements->at(i)));
   }
 }
 
 
-HBasicBlock* HGraphBuilder::CreateBasicBlock(HEnvironment* env) {
+HBasicBlock* HOptimizedGraphBuilder::CreateBasicBlock(HEnvironment* env) {
   HBasicBlock* b = graph()->CreateBasicBlock();
   b->SetInitialEnvironment(env);
   return b;
 }
 
 
-HBasicBlock* HGraphBuilder::CreateLoopHeaderBlock() {
+HBasicBlock* HOptimizedGraphBuilder::CreateLoopHeaderBlock() {
   HBasicBlock* header = graph()->CreateBasicBlock();
   HEnvironment* entry_env = environment()->CopyAsLoopHeader(header);
   header->SetInitialEnvironment(entry_env);
   header->AttachLoopInformation();
   return header;
 }
 
 
-void HGraphBuilder::VisitBlock(Block* stmt) {
+void HOptimizedGraphBuilder::VisitBlock(Block* stmt) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   if (stmt->scope() != NULL) {
     return Bailout("ScopedBlock");
   }
   BreakAndContinueInfo break_info(stmt);
   { BreakAndContinueScope push(&break_info, this);
     CHECK_BAILOUT(VisitStatements(stmt->statements()));
   }
   HBasicBlock* break_block = break_info.break_block();
   if (break_block != NULL) {
     if (current_block() != NULL) current_block()->Goto(break_block);
     break_block->SetJoinId(stmt->ExitId());
     set_current_block(break_block);
   }
 }
 
 
-void HGraphBuilder::VisitExpressionStatement(ExpressionStatement* stmt) {
+void HOptimizedGraphBuilder::VisitExpressionStatement(
+    ExpressionStatement* stmt) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   VisitForEffect(stmt->expression());
 }
 
 
-void HGraphBuilder::VisitEmptyStatement(EmptyStatement* stmt) {
+void HOptimizedGraphBuilder::VisitEmptyStatement(EmptyStatement* stmt) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
 }
 
 
-void HGraphBuilder::VisitIfStatement(IfStatement* stmt) {
+void HOptimizedGraphBuilder::VisitIfStatement(IfStatement* stmt) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   if (stmt->condition()->ToBooleanIsTrue()) {
     AddSimulate(stmt->ThenId());
     Visit(stmt->then_statement());
   } else if (stmt->condition()->ToBooleanIsFalse()) {
     AddSimulate(stmt->ElseId());
     Visit(stmt->else_statement());
   } else {
@@ skipping 18 matching lines @@
     } else {
       cond_false = NULL;
     }
 
     HBasicBlock* join = CreateJoin(cond_true, cond_false, stmt->IfId());
     set_current_block(join);
   }
 }
 
 
-HBasicBlock* HGraphBuilder::BreakAndContinueScope::Get(
+HBasicBlock* HOptimizedGraphBuilder::BreakAndContinueScope::Get(
     BreakableStatement* stmt,
     BreakType type,
     int* drop_extra) {
   *drop_extra = 0;
   BreakAndContinueScope* current = this;
   while (current != NULL && current->info()->target() != stmt) {
     *drop_extra += current->info()->drop_extra();
     current = current->next();
   }
   ASSERT(current != NULL);  // Always found (unless stack is malformed).
@@ skipping 18 matching lines @@
         block = current->owner()->graph()->CreateBasicBlock();
         current->info()->set_continue_block(block);
       }
       break;
   }
 
   return block;
 }
 
 
-void HGraphBuilder::VisitContinueStatement(ContinueStatement* stmt) {
+void HOptimizedGraphBuilder::VisitContinueStatement(
+    ContinueStatement* stmt) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   int drop_extra = 0;
   HBasicBlock* continue_block = break_scope()->Get(stmt->target(),
                                                    CONTINUE,
                                                    &drop_extra);
   Drop(drop_extra);
   current_block()->Goto(continue_block);
   set_current_block(NULL);
 }
 
 
-void HGraphBuilder::VisitBreakStatement(BreakStatement* stmt) {
+void HOptimizedGraphBuilder::VisitBreakStatement(BreakStatement* stmt) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   int drop_extra = 0;
   HBasicBlock* break_block = break_scope()->Get(stmt->target(),
                                                 BREAK,
                                                 &drop_extra);
   Drop(drop_extra);
   current_block()->Goto(break_block);
   set_current_block(NULL);
 }
 
 
-void HGraphBuilder::VisitReturnStatement(ReturnStatement* stmt) {
+void HOptimizedGraphBuilder::VisitReturnStatement(ReturnStatement* stmt) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   FunctionState* state = function_state();
   AstContext* context = call_context();
   if (context == NULL) {
     // Not an inlined return, so an actual one.
     CHECK_ALIVE(VisitForValue(stmt->expression()));
     HValue* result = environment()->Pop();
     current_block()->FinishExit(new(zone()) HReturn(result));
@@ skipping 51 matching lines @@
     } else {
       ASSERT(context->IsValue());
       CHECK_ALIVE(VisitForValue(stmt->expression()));
       current_block()->AddLeaveInlined(Pop(), state);
     }
   }
   set_current_block(NULL);
 }
 
 
-void HGraphBuilder::VisitWithStatement(WithStatement* stmt) {
+void HOptimizedGraphBuilder::VisitWithStatement(WithStatement* stmt) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   return Bailout("WithStatement");
 }
 
 
-void HGraphBuilder::VisitSwitchStatement(SwitchStatement* stmt) {
+void HOptimizedGraphBuilder::VisitSwitchStatement(SwitchStatement* stmt) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   // We only optimize switch statements with smi-literal smi comparisons,
   // with a bounded number of clauses.
   const int kCaseClauseLimit = 128;
   ZoneList<CaseClause*>* clauses = stmt->cases();
   int clause_count = clauses->length();
   if (clause_count > kCaseClauseLimit) {
     return Bailout("SwitchStatement: too many clauses");
@@ skipping 165 matching lines @@
                                  stmt->ExitId()));
   } else {
     if (fall_through_block != NULL) fall_through_block->Goto(break_block);
     if (last_block != NULL) last_block->Goto(break_block);
     break_block->SetJoinId(stmt->ExitId());
     set_current_block(break_block);
   }
 }
 
 
-bool HGraphBuilder::HasOsrEntryAt(IterationStatement* statement) {
+bool HOptimizedGraphBuilder::HasOsrEntryAt(IterationStatement* statement) {
   return statement->OsrEntryId() == info()->osr_ast_id();
 }
 
 
-bool HGraphBuilder::PreProcessOsrEntry(IterationStatement* statement) {
+bool HOptimizedGraphBuilder::PreProcessOsrEntry(IterationStatement* statement) {
   if (!HasOsrEntryAt(statement)) return false;
 
   HBasicBlock* non_osr_entry = graph()->CreateBasicBlock();
   HBasicBlock* osr_entry = graph()->CreateBasicBlock();
   HValue* true_value = graph()->GetConstantTrue();
   HBranch* test = new(zone()) HBranch(true_value, non_osr_entry, osr_entry);
   current_block()->Finish(test);
 
   HBasicBlock* loop_predecessor = graph()->CreateBasicBlock();
   non_osr_entry->Goto(loop_predecessor);
@@ skipping 29 matching lines @@
   HContext* context = new(zone()) HContext;
   AddInstruction(context);
   environment()->BindContext(context);
   current_block()->Goto(loop_predecessor);
   loop_predecessor->SetJoinId(statement->EntryId());
   set_current_block(loop_predecessor);
   return true;
 }
 
 
-void HGraphBuilder::VisitLoopBody(IterationStatement* stmt,
-                                  HBasicBlock* loop_entry,
-                                  BreakAndContinueInfo* break_info) {
+void HOptimizedGraphBuilder::VisitLoopBody(IterationStatement* stmt,
+                                           HBasicBlock* loop_entry,
+                                           BreakAndContinueInfo* break_info) {
   BreakAndContinueScope push(break_info, this);
   AddSimulate(stmt->StackCheckId());
   HValue* context = environment()->LookupContext();
   HStackCheck* stack_check =
     new(zone()) HStackCheck(context, HStackCheck::kBackwardsBranch);
   AddInstruction(stack_check);
   ASSERT(loop_entry->IsLoopHeader());
   loop_entry->loop_information()->set_stack_check(stack_check);
   CHECK_BAILOUT(Visit(stmt->body()));
 }
 
 
-void HGraphBuilder::VisitDoWhileStatement(DoWhileStatement* stmt) {
+void HOptimizedGraphBuilder::VisitDoWhileStatement(DoWhileStatement* stmt) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   ASSERT(current_block() != NULL);
   bool osr_entry = PreProcessOsrEntry(stmt);
   HBasicBlock* loop_entry = CreateLoopHeaderBlock();
   current_block()->Goto(loop_entry);
   set_current_block(loop_entry);
   if (osr_entry) graph()->set_osr_loop_entry(loop_entry);
 
@@ skipping 22 matching lines @@
   }
   HBasicBlock* loop_exit = CreateLoop(stmt,
                                       loop_entry,
                                       body_exit,
                                       loop_successor,
                                       break_info.break_block());
   set_current_block(loop_exit);
 }
 
 
-void HGraphBuilder::VisitWhileStatement(WhileStatement* stmt) {
+void HOptimizedGraphBuilder::VisitWhileStatement(WhileStatement* stmt) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   ASSERT(current_block() != NULL);
   bool osr_entry = PreProcessOsrEntry(stmt);
   HBasicBlock* loop_entry = CreateLoopHeaderBlock();
   current_block()->Goto(loop_entry);
   set_current_block(loop_entry);
   if (osr_entry) graph()->set_osr_loop_entry(loop_entry);
 
@@ skipping 23 matching lines @@
       JoinContinue(stmt, current_block(), break_info.continue_block());
   HBasicBlock* loop_exit = CreateLoop(stmt,
                                       loop_entry,
                                       body_exit,
                                       loop_successor,
                                       break_info.break_block());
   set_current_block(loop_exit);
 }
 
 
-void HGraphBuilder::VisitForStatement(ForStatement* stmt) {
+void HOptimizedGraphBuilder::VisitForStatement(ForStatement* stmt) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   if (stmt->init() != NULL) {
     CHECK_ALIVE(Visit(stmt->init()));
   }
   ASSERT(current_block() != NULL);
   bool osr_entry = PreProcessOsrEntry(stmt);
   HBasicBlock* loop_entry = CreateLoopHeaderBlock();
   current_block()->Goto(loop_entry);
@@ skipping 31 matching lines @@
 
   HBasicBlock* loop_exit = CreateLoop(stmt,
                                       loop_entry,
                                       body_exit,
                                       loop_successor,
                                       break_info.break_block());
   set_current_block(loop_exit);
 }
 
 
-void HGraphBuilder::VisitForInStatement(ForInStatement* stmt) {
+void HOptimizedGraphBuilder::VisitForInStatement(ForInStatement* stmt) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
 
   if (!FLAG_optimize_for_in) {
     return Bailout("ForInStatement optimization is disabled");
   }
 
   if (!oracle()->IsForInFastCase(stmt)) {
     return Bailout("ForInStatement is not fast case");
@@ skipping 100 matching lines @@
   HBasicBlock* loop_exit = CreateLoop(stmt,
                                       loop_entry,
                                       body_exit,
                                       loop_successor,
                                       break_info.break_block());
 
   set_current_block(loop_exit);
 }
 
 
-void HGraphBuilder::VisitTryCatchStatement(TryCatchStatement* stmt) {
+void HOptimizedGraphBuilder::VisitTryCatchStatement(TryCatchStatement* stmt) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   return Bailout("TryCatchStatement");
 }
 
 
-void HGraphBuilder::VisitTryFinallyStatement(TryFinallyStatement* stmt) {
+void HOptimizedGraphBuilder::VisitTryFinallyStatement(
+    TryFinallyStatement* stmt) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   return Bailout("TryFinallyStatement");
 }
 
 
-void HGraphBuilder::VisitDebuggerStatement(DebuggerStatement* stmt) {
+void HOptimizedGraphBuilder::VisitDebuggerStatement(DebuggerStatement* stmt) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   return Bailout("DebuggerStatement");
 }
 
 
 static Handle<SharedFunctionInfo> SearchSharedFunctionInfo(
     Code* unoptimized_code, FunctionLiteral* expr) {
   int start_position = expr->start_position();
   RelocIterator it(unoptimized_code);
   for (;!it.done(); it.next()) {
     RelocInfo* rinfo = it.rinfo();
     if (rinfo->rmode() != RelocInfo::EMBEDDED_OBJECT) continue;
     Object* obj = rinfo->target_object();
     if (obj->IsSharedFunctionInfo()) {
       SharedFunctionInfo* shared = SharedFunctionInfo::cast(obj);
       if (shared->start_position() == start_position) {
         return Handle<SharedFunctionInfo>(shared);
       }
     }
   }
 
   return Handle<SharedFunctionInfo>();
 }
 
 
-void HGraphBuilder::VisitFunctionLiteral(FunctionLiteral* expr) {
+void HOptimizedGraphBuilder::VisitFunctionLiteral(FunctionLiteral* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   Handle<SharedFunctionInfo> shared_info =
       SearchSharedFunctionInfo(info()->shared_info()->code(),
                                expr);
   if (shared_info.is_null()) {
     shared_info = Compiler::BuildFunctionInfo(expr, info()->script());
   }
   // We also have a stack overflow if the recursive compilation did.
   if (HasStackOverflow()) return;
   HValue* context = environment()->LookupContext();
   HFunctionLiteral* instr =
       new(zone()) HFunctionLiteral(context, shared_info, expr->pretenure());
   return ast_context()->ReturnInstruction(instr, expr->id());
 }
 
 
-void HGraphBuilder::VisitSharedFunctionInfoLiteral(
+void HOptimizedGraphBuilder::VisitSharedFunctionInfoLiteral(
     SharedFunctionInfoLiteral* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   return Bailout("SharedFunctionInfoLiteral");
 }
 
 
-void HGraphBuilder::VisitConditional(Conditional* expr) {
+void HOptimizedGraphBuilder::VisitConditional(Conditional* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   HBasicBlock* cond_true = graph()->CreateBasicBlock();
   HBasicBlock* cond_false = graph()->CreateBasicBlock();
   CHECK_BAILOUT(VisitForControl(expr->condition(), cond_true, cond_false));
 
   // Visit the true and false subexpressions in the same AST context as the
   // whole expression.
   if (cond_true->HasPredecessor()) {
@@ skipping 17 matching lines @@
   if (!ast_context()->IsTest()) {
     HBasicBlock* join = CreateJoin(cond_true, cond_false, expr->id());
     set_current_block(join);
     if (join != NULL && !ast_context()->IsEffect()) {
       return ast_context()->ReturnValue(Pop());
     }
   }
 }
 
 
-HGraphBuilder::GlobalPropertyAccess HGraphBuilder::LookupGlobalProperty(
-    Variable* var, LookupResult* lookup, bool is_store) {
+HOptimizedGraphBuilder::GlobalPropertyAccess
+    HOptimizedGraphBuilder::LookupGlobalProperty(
+        Variable* var, LookupResult* lookup, bool is_store) {
   if (var->is_this() || !info()->has_global_object()) {
     return kUseGeneric;
   }
   Handle<GlobalObject> global(info()->global_object());
   global->Lookup(*var->name(), lookup);
   if (!lookup->IsNormal() ||
       (is_store && lookup->IsReadOnly()) ||
       lookup->holder() != *global) {
     return kUseGeneric;
   }
 
   return kUseCell;
 }
 
 
-HValue* HGraphBuilder::BuildContextChainWalk(Variable* var) {
+HValue* HOptimizedGraphBuilder::BuildContextChainWalk(Variable* var) {
   ASSERT(var->IsContextSlot());
   HValue* context = environment()->LookupContext();
   int length = info()->scope()->ContextChainLength(var->scope());
   while (length-- > 0) {
     HInstruction* context_instruction = new(zone()) HOuterContext(context);
     AddInstruction(context_instruction);
     context = context_instruction;
   }
   return context;
 }
 
 
-void HGraphBuilder::VisitVariableProxy(VariableProxy* expr) {
+void HOptimizedGraphBuilder::VisitVariableProxy(VariableProxy* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   Variable* variable = expr->var();
   switch (variable->location()) {
     case Variable::UNALLOCATED: {
       if (IsLexicalVariableMode(variable->mode())) {
         // TODO(rossberg): should this be an ASSERT?
         return Bailout("reference to global lexical variable");
       }
@@ skipping 52 matching lines @@
       HLoadContextSlot* instr = new(zone()) HLoadContextSlot(context, variable);
       return ast_context()->ReturnInstruction(instr, expr->id());
     }
 
     case Variable::LOOKUP:
       return Bailout("reference to a variable which requires dynamic lookup");
   }
 }
 
 
-void HGraphBuilder::VisitLiteral(Literal* expr) {
+void HOptimizedGraphBuilder::VisitLiteral(Literal* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   HConstant* instr =
       new(zone()) HConstant(expr->handle(), Representation::None());
   return ast_context()->ReturnInstruction(instr, expr->id());
 }
 
 
-void HGraphBuilder::VisitRegExpLiteral(RegExpLiteral* expr) {
+void HOptimizedGraphBuilder::VisitRegExpLiteral(RegExpLiteral* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   Handle<JSFunction> closure = function_state()->compilation_info()->closure();
   Handle<FixedArray> literals(closure->literals());
   HValue* context = environment()->LookupContext();
 
   HRegExpLiteral* instr = new(zone()) HRegExpLiteral(context,
                                                      literals,
                                                      expr->pattern(),
@@ skipping 138 matching lines @@
         }
       }
     }
   }
 
   *total_size += boilerplate->map()->instance_size();
   return true;
 }
 
 
-void HGraphBuilder::VisitObjectLiteral(ObjectLiteral* expr) {
+void HOptimizedGraphBuilder::VisitObjectLiteral(ObjectLiteral* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   Handle<JSFunction> closure = function_state()->compilation_info()->closure();
   HValue* context = environment()->LookupContext();
   HInstruction* literal;
 
   // Check whether to use fast or slow deep-copying for boilerplate.
   int total_size = 0;
   int max_properties = HFastLiteral::kMaxLiteralProperties;
@@ skipping 84 matching lines @@
     // (e.g. because of code motion).
     HToFastProperties* result = new(zone()) HToFastProperties(Pop());
     AddInstruction(result);
     return ast_context()->ReturnValue(result);
   } else {
     return ast_context()->ReturnValue(Pop());
   }
 }
 
 
-void HGraphBuilder::VisitArrayLiteral(ArrayLiteral* expr) {
+void HOptimizedGraphBuilder::VisitArrayLiteral(ArrayLiteral* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   ZoneList<Expression*>* subexprs = expr->values();
   int length = subexprs->length();
   HValue* context = environment()->LookupContext();
   HInstruction* literal;
 
   Handle<FixedArray> literals(environment()->closure()->literals());
   Handle<Object> raw_boilerplate(literals->get(expr->literal_index()));
@@ skipping 113 matching lines @@
   ASSERT(lookup->IsField() || lookup->IsTransitionToField(*type));
   if (lookup->IsField()) {
     return lookup->GetLocalFieldIndexFromMap(*type);
   } else {
     Map* transition = lookup->GetTransitionMapFromMap(*type);
     return transition->PropertyIndexFor(*name) - type->inobject_properties();
   }
 }
 
 
-void HGraphBuilder::AddCheckMapsWithTransitions(HValue* object,
-                                                Handle<Map> map) {
+void HOptimizedGraphBuilder::AddCheckMapsWithTransitions(HValue* object,
+                                                         Handle<Map> map) {
   AddInstruction(new(zone()) HCheckNonSmi(object));
   AddInstruction(HCheckMaps::NewWithTransitions(object, map, zone()));
 }
 
 
-HInstruction* HGraphBuilder::BuildStoreNamedField(HValue* object,
-                                                  Handle<String> name,
-                                                  HValue* value,
-                                                  Handle<Map> map,
-                                                  LookupResult* lookup) {
+HInstruction* HOptimizedGraphBuilder::BuildStoreNamedField(
+    HValue* object,
+    Handle<String> name,
+    HValue* value,
+    Handle<Map> map,
+    LookupResult* lookup) {
   ASSERT(lookup->IsFound());
   // If the property does not exist yet, we have to check that it wasn't made
   // readonly or turned into a setter by some meanwhile modifications on the
   // prototype chain.
   if (!lookup->IsProperty() && map->prototype()->IsJSReceiver()) {
     Object* proto = map->prototype();
     // First check that the prototype chain isn't affected already.
     LookupResult proto_result(isolate());
     proto->Lookup(*name, &proto_result);
     if (proto_result.IsProperty()) {
@@ skipping 31 matching lines @@
     Handle<Map> transition(lookup->GetTransitionMapFromMap(*map));
     instr->set_transition(transition);
     // TODO(fschneider): Record the new map type of the object in the IR to
     // enable elimination of redundant checks after the transition store.
     instr->SetGVNFlag(kChangesMaps);
   }
   return instr;
 }
 
 
-HInstruction* HGraphBuilder::BuildStoreNamedGeneric(HValue* object,
-                                                    Handle<String> name,
-                                                    HValue* value) {
+HInstruction* HOptimizedGraphBuilder::BuildStoreNamedGeneric(
+    HValue* object,
+    Handle<String> name,
+    HValue* value) {
   HValue* context = environment()->LookupContext();
   return new(zone()) HStoreNamedGeneric(
                          context,
                          object,
                          name,
                          value,
                          function_strict_mode_flag());
 }
 
 
-HInstruction* HGraphBuilder::BuildCallSetter(HValue* object,
-                                             HValue* value,
-                                             Handle<Map> map,
-                                             Handle<JSFunction> setter,
-                                             Handle<JSObject> holder) {
+HInstruction* HOptimizedGraphBuilder::BuildCallSetter(
+    HValue* object,
+    HValue* value,
+    Handle<Map> map,
+    Handle<JSFunction> setter,
+    Handle<JSObject> holder) {
   AddCheckConstantFunction(holder, object, map);
   AddInstruction(new(zone()) HPushArgument(object));
   AddInstruction(new(zone()) HPushArgument(value));
   return new(zone()) HCallConstantFunction(setter, 2);
 }
 
 
-HInstruction* HGraphBuilder::BuildStoreNamedMonomorphic(HValue* object,
-                                                        Handle<String> name,
-                                                        HValue* value,
-                                                        Handle<Map> map) {
+HInstruction* HOptimizedGraphBuilder::BuildStoreNamedMonomorphic(
+    HValue* object,
+    Handle<String> name,
+    HValue* value,
+    Handle<Map> map) {
   // Handle a store to a known field.
   LookupResult lookup(isolate());
   if (ComputeLoadStoreField(map, name, &lookup, true)) {
     AddCheckMapsWithTransitions(object, map);
     return BuildStoreNamedField(object, name, value, map, &lookup);
   }
 
   // No luck, do a generic store.
   return BuildStoreNamedGeneric(object, name, value);
 }
 
 
-void HGraphBuilder::HandlePolymorphicLoadNamedField(Property* expr,
-                                                    HValue* object,
-                                                    SmallMapList* types,
-                                                    Handle<String> name) {
+void HOptimizedGraphBuilder::HandlePolymorphicLoadNamedField(
+    Property* expr,
+    HValue* object,
+    SmallMapList* types,
+    Handle<String> name) {
   int count = 0;
   int previous_field_offset = 0;
   bool previous_field_is_in_object = false;
   bool is_monomorphic_field = true;
   Handle<Map> map;
   LookupResult lookup(isolate());
   for (int i = 0; i < types->length() && count < kMaxLoadPolymorphism; ++i) {
     map = types->at(i);
     if (ComputeLoadStoreField(map, name, &lookup, false)) {
       int index = ComputeLoadStoreFieldIndex(map, name, &lookup);
@@ skipping 31 matching lines @@
                                                    types,
                                                    name,
                                                    zone());
   }
 
   instr->set_position(expr->position());
   return ast_context()->ReturnInstruction(instr, expr->id());
 }
 
 
-void HGraphBuilder::HandlePolymorphicStoreNamedField(Assignment* expr,
-                                                     HValue* object,
-                                                     HValue* value,
-                                                     SmallMapList* types,
-                                                     Handle<String> name) {
+void HOptimizedGraphBuilder::HandlePolymorphicStoreNamedField(
+    Assignment* expr,
+    HValue* object,
+    HValue* value,
+    SmallMapList* types,
+    Handle<String> name) {
   // TODO(ager): We should recognize when the prototype chains for different
   // maps are identical. In that case we can avoid repeatedly generating the
   // same prototype map checks.
   int count = 0;
   HBasicBlock* join = NULL;
   for (int i = 0; i < types->length() && count < kMaxStorePolymorphism; ++i) {
     Handle<Map> map = types->at(i);
     LookupResult lookup(isolate());
     if (ComputeLoadStoreField(map, name, &lookup, true)) {
       if (count == 0) {
@@ skipping 51 matching lines @@
     }
   }
 
   ASSERT(join != NULL);
   join->SetJoinId(expr->id());
   set_current_block(join);
   if (!ast_context()->IsEffect()) return ast_context()->ReturnValue(Pop());
 }
 
 
-void HGraphBuilder::HandlePropertyAssignment(Assignment* expr) {
+void HOptimizedGraphBuilder::HandlePropertyAssignment(Assignment* expr) {
   Property* prop = expr->target()->AsProperty();
   ASSERT(prop != NULL);
   expr->RecordTypeFeedback(oracle(), zone());
   CHECK_ALIVE(VisitForValue(prop->obj()));
 
   if (prop->key()->IsPropertyName()) {
     // Named store.
     CHECK_ALIVE(VisitForValue(expr->value()));
     HValue* value = environment()->ExpressionStackAt(0);
     HValue* object = environment()->ExpressionStackAt(1);
@@ skipping 62 matching lines @@
     ASSERT(has_side_effects);  // Stores always have side effects.
     AddSimulate(expr->AssignmentId(), REMOVABLE_SIMULATE);
     return ast_context()->ReturnValue(Pop());
   }
 }
 
 
 // Because not every expression has a position and there is not common
 // superclass of Assignment and CountOperation, we cannot just pass the
 // owning expression instead of position and ast_id separately.
-void HGraphBuilder::HandleGlobalVariableAssignment(Variable* var,
-                                                   HValue* value,
-                                                   int position,
-                                                   BailoutId ast_id) {
+void HOptimizedGraphBuilder::HandleGlobalVariableAssignment(
+    Variable* var,
+    HValue* value,
+    int position,
+    BailoutId ast_id) {
   LookupResult lookup(isolate());
   GlobalPropertyAccess type = LookupGlobalProperty(var, &lookup, true);
   if (type == kUseCell) {
     Handle<GlobalObject> global(info()->global_object());
     Handle<JSGlobalPropertyCell> cell(global->GetPropertyCell(&lookup));
     HInstruction* instr =
         new(zone()) HStoreGlobalCell(value, cell, lookup.GetPropertyDetails());
     instr->set_position(position);
     AddInstruction(instr);
     if (instr->HasObservableSideEffects()) {
@@ skipping 10 matching lines @@
                                         value,
                                         function_strict_mode_flag());
     instr->set_position(position);
     AddInstruction(instr);
     ASSERT(instr->HasObservableSideEffects());
     AddSimulate(ast_id, REMOVABLE_SIMULATE);
   }
 }
 
 
-void HGraphBuilder::HandleCompoundAssignment(Assignment* expr) {
+void HOptimizedGraphBuilder::HandleCompoundAssignment(Assignment* expr) {
   Expression* target = expr->target();
   VariableProxy* proxy = target->AsVariableProxy();
   Property* prop = target->AsProperty();
   ASSERT(proxy == NULL || prop == NULL);
 
   // We have a second position recorded in the FullCodeGenerator to have
   // type feedback for the binary operation.
   BinaryOperation* operation = expr->binary_operation();
 
   if (proxy != NULL) {
@@ skipping 176 matching lines @@
       AddSimulate(expr->AssignmentId(), REMOVABLE_SIMULATE);
       return ast_context()->ReturnValue(Pop());
     }
 
   } else {
     return Bailout("invalid lhs in compound assignment");
   }
 }
 
 
-void HGraphBuilder::VisitAssignment(Assignment* expr) {
+void HOptimizedGraphBuilder::VisitAssignment(Assignment* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   VariableProxy* proxy = expr->target()->AsVariableProxy();
   Property* prop = expr->target()->AsProperty();
   ASSERT(proxy == NULL || prop == NULL);
 
   if (expr->is_compound()) {
     HandleCompoundAssignment(expr);
     return;
@@ skipping 106 matching lines @@
 
       case Variable::LOOKUP:
         return Bailout("assignment to LOOKUP variable");
     }
   } else {
     return Bailout("invalid left-hand side in assignment");
   }
 }
 
 
-void HGraphBuilder::VisitThrow(Throw* expr) {
+void HOptimizedGraphBuilder::VisitThrow(Throw* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   // We don't optimize functions with invalid left-hand sides in
   // assignments, count operations, or for-in.  Consequently throw can
   // currently only occur in an effect context.
   ASSERT(ast_context()->IsEffect());
   CHECK_ALIVE(VisitForValue(expr->exception()));
 
   HValue* context = environment()->LookupContext();
   HValue* value = environment()->Pop();
   HThrow* instr = new(zone()) HThrow(context, value);
   instr->set_position(expr->position());
   AddInstruction(instr);
   AddSimulate(expr->id());
   current_block()->FinishExit(new(zone()) HAbnormalExit);
   set_current_block(NULL);
 }
 
 
-HLoadNamedField* HGraphBuilder::BuildLoadNamedField(HValue* object,
-                                                    Handle<Map> map,
-                                                    LookupResult* lookup) {
+HLoadNamedField* HOptimizedGraphBuilder::BuildLoadNamedField(
+    HValue* object,
+    Handle<Map> map,
+    LookupResult* lookup) {
   int index = lookup->GetLocalFieldIndexFromMap(*map);
   if (index < 0) {
     // Negative property indices are in-object properties, indexed
     // from the end of the fixed part of the object.
     int offset = (index * kPointerSize) + map->instance_size();
     return new(zone()) HLoadNamedField(object, true, offset);
   } else {
     // Non-negative property indices are in the properties array.
     int offset = (index * kPointerSize) + FixedArray::kHeaderSize;
     return new(zone()) HLoadNamedField(object, false, offset);
   }
 }
 
 
-HInstruction* HGraphBuilder::BuildLoadNamedGeneric(HValue* object,
-                                                   Handle<String> name,
-                                                   Property* expr) {
+HInstruction* HOptimizedGraphBuilder::BuildLoadNamedGeneric(
+    HValue* object,
+    Handle<String> name,
+    Property* expr) {
   if (expr->IsUninitialized() && !FLAG_always_opt) {
     AddInstruction(new(zone()) HSoftDeoptimize);
     current_block()->MarkAsDeoptimizing();
   }
   HValue* context = environment()->LookupContext();
   return new(zone()) HLoadNamedGeneric(context, object, name);
 }
 
 
-HInstruction* HGraphBuilder::BuildCallGetter(HValue* object,
-                                             Handle<Map> map,
-                                             Handle<JSFunction> getter,
-                                             Handle<JSObject> holder) {
+HInstruction* HOptimizedGraphBuilder::BuildCallGetter(
+    HValue* object,
+    Handle<Map> map,
+    Handle<JSFunction> getter,
+    Handle<JSObject> holder) {
   AddCheckConstantFunction(holder, object, map);
   AddInstruction(new(zone()) HPushArgument(object));
   return new(zone()) HCallConstantFunction(getter, 1);
 }
 
 
-HInstruction* HGraphBuilder::BuildLoadNamedMonomorphic(HValue* object,
-                                                       Handle<String> name,
-                                                       Property* expr,
-                                                       Handle<Map> map) {
+HInstruction* HOptimizedGraphBuilder::BuildLoadNamedMonomorphic(
+    HValue* object,
+    Handle<String> name,
+    Property* expr,
+    Handle<Map> map) {
   // Handle a load from a known field.
   ASSERT(!map->is_dictionary_map());
   LookupResult lookup(isolate());
   map->LookupDescriptor(NULL, *name, &lookup);
   if (lookup.IsField()) {
     AddCheckMapsWithTransitions(object, map);
     return BuildLoadNamedField(object, map, &lookup);
   }
 
   // Handle a load of a constant known function.
@@ skipping 13 matching lines @@
     HInstruction* holder_value =
         AddInstruction(new(zone()) HCheckPrototypeMaps(prototype, holder));
     return BuildLoadNamedField(holder_value, holder_map, &lookup);
   }
 
   // No luck, do a generic load.
   return BuildLoadNamedGeneric(object, name, expr);
 }
 
 
-HInstruction* HGraphBuilder::BuildLoadKeyedGeneric(HValue* object,
-                                                   HValue* key) {
+HInstruction* HOptimizedGraphBuilder::BuildLoadKeyedGeneric(HValue* object,
+                                                            HValue* key) {
   HValue* context = environment()->LookupContext();
   return new(zone()) HLoadKeyedGeneric(context, object, key);
 }
 
 
-HInstruction* HGraphBuilder::BuildExternalArrayElementAccess(
-    HValue* external_elements,
-    HValue* checked_key,
+HInstruction* HOptimizedGraphBuilder::BuildMonomorphicElementAccess(
+    HValue* object,
+    HValue* key,
     HValue* val,
     HValue* dependency,
-    ElementsKind elements_kind,
+    Handle<Map> map,
     bool is_store) {
-  if (is_store) {
-    ASSERT(val != NULL);
-    switch (elements_kind) {
-      case EXTERNAL_PIXEL_ELEMENTS: {
-        val = AddInstruction(new(zone()) HClampToUint8(val));
-        break;
-      }
-      case EXTERNAL_BYTE_ELEMENTS:
-      case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
-      case EXTERNAL_SHORT_ELEMENTS:
-      case EXTERNAL_UNSIGNED_SHORT_ELEMENTS:
-      case EXTERNAL_INT_ELEMENTS:
-      case EXTERNAL_UNSIGNED_INT_ELEMENTS: {
-        break;
-      }
-      case EXTERNAL_FLOAT_ELEMENTS:
-      case EXTERNAL_DOUBLE_ELEMENTS:
-        break;
-      case FAST_SMI_ELEMENTS:
-      case FAST_ELEMENTS:
-      case FAST_DOUBLE_ELEMENTS:
-      case FAST_HOLEY_SMI_ELEMENTS:
-      case FAST_HOLEY_ELEMENTS:
-      case FAST_HOLEY_DOUBLE_ELEMENTS:
-      case DICTIONARY_ELEMENTS:
-      case NON_STRICT_ARGUMENTS_ELEMENTS:
-        UNREACHABLE();
-        break;
-    }
-    return new(zone()) HStoreKeyed(external_elements,
-                                   checked_key,
-                                   val,
-                                   elements_kind);
-  } else {
-    ASSERT(val == NULL);
-    HLoadKeyed* load =
-       new(zone()) HLoadKeyed(
-           external_elements, checked_key, dependency, elements_kind);
-    if (FLAG_opt_safe_uint32_operations &&
-        elements_kind == EXTERNAL_UNSIGNED_INT_ELEMENTS) {
-      graph()->RecordUint32Instruction(load);
-    }
-    return load;
-  }
-}
-
-
-HInstruction* HGraphBuilder::BuildFastElementAccess(HValue* elements,
-                                                    HValue* checked_key,
-                                                    HValue* val,
-                                                    HValue* load_dependency,
-                                                    ElementsKind elements_kind,
-                                                    bool is_store) {
-  if (is_store) {
-    ASSERT(val != NULL);
-    switch (elements_kind) {
-      case FAST_SMI_ELEMENTS:
-      case FAST_HOLEY_SMI_ELEMENTS:
-        // Smi-only arrays need a smi check.
-        AddInstruction(new(zone()) HCheckSmi(val));
-        // Fall through.
-      case FAST_ELEMENTS:
-      case FAST_HOLEY_ELEMENTS:
-      case FAST_DOUBLE_ELEMENTS:
-      case FAST_HOLEY_DOUBLE_ELEMENTS:
-        return new(zone()) HStoreKeyed(
-            elements, checked_key, val, elements_kind);
-      default:
-        UNREACHABLE();
-        return NULL;
-    }
-  }
-  // It's an element load (!is_store).
-  return new(zone()) HLoadKeyed(elements,
-                                checked_key,
-                                load_dependency,
-                                elements_kind);
-}
-
-
-HInstruction* HGraphBuilder::BuildMonomorphicElementAccess(HValue* object,
-                                                           HValue* key,
-                                                           HValue* val,
-                                                           HValue* dependency,
-                                                           Handle<Map> map,
-                                                           bool is_store) {
   HCheckMaps* mapcheck = new(zone()) HCheckMaps(object, map,
                                                 zone(), dependency);
   AddInstruction(mapcheck);
   if (dependency) {
     mapcheck->ClearGVNFlag(kDependsOnElementsKind);
   }
-  return BuildUncheckedMonomorphicElementAccess(object, key, val,
-                                                mapcheck, map, is_store);
+  return BuildUncheckedMonomorphicElementAccess(
+      object, key, val,
+      mapcheck, map->instance_type() == JS_ARRAY_TYPE,
+      map->elements_kind(), is_store);
 }
 
 
-HInstruction* HGraphBuilder::BuildUncheckedMonomorphicElementAccess(
+HInstruction* HOptimizedGraphBuilder::TryBuildConsolidatedElementLoad(
     HValue* object,
     HValue* key,
     HValue* val,
-    HCheckMaps* mapcheck,
-    Handle<Map> map,
-    bool is_store) {
-  // No GVNFlag is necessary for ElementsKind if there is an explicit dependency
-  // on a HElementsTransition instruction. The flag can also be removed if the
-  // map to check has FAST_HOLEY_ELEMENTS, since there can be no further
-  // ElementsKind transitions. Finally, the dependency can be removed for stores
-  // for FAST_ELEMENTS, since a transition to HOLEY elements won't change the
-  // generated store code.
-  if ((map->elements_kind() == FAST_HOLEY_ELEMENTS) ||
-      (map->elements_kind() == FAST_ELEMENTS && is_store)) {
-    mapcheck->ClearGVNFlag(kDependsOnElementsKind);
-  }
-  bool fast_smi_only_elements = map->has_fast_smi_elements();
-  bool fast_elements = map->has_fast_object_elements();
-  HInstruction* elements =
-      AddInstruction(new(zone()) HLoadElements(object, mapcheck));
-  if (is_store && (fast_elements || fast_smi_only_elements)) {
-    HCheckMaps* check_cow_map = new(zone()) HCheckMaps(
-        elements, isolate()->factory()->fixed_array_map(), zone());
-    check_cow_map->ClearGVNFlag(kDependsOnElementsKind);
-    AddInstruction(check_cow_map);
-  }
-  HInstruction* length = NULL;
-  HInstruction* checked_key = NULL;
-  if (map->has_external_array_elements()) {
-    length = AddInstruction(new(zone()) HFixedArrayBaseLength(elements));
-    checked_key = AddInstruction(new(zone()) HBoundsCheck(key, length,
-                                                          ALLOW_SMI_KEY));
-    HLoadExternalArrayPointer* external_elements =
-        new(zone()) HLoadExternalArrayPointer(elements);
-    AddInstruction(external_elements);
-    return BuildExternalArrayElementAccess(
-        external_elements, checked_key, val, mapcheck,
-        map->elements_kind(), is_store);
-  }
-  ASSERT(fast_smi_only_elements ||
-         fast_elements ||
-         map->has_fast_double_elements());
-  if (map->instance_type() == JS_ARRAY_TYPE) {
-    length = AddInstruction(new(zone()) HJSArrayLength(object, mapcheck,
-                                                       HType::Smi()));
-  } else {
-    length = AddInstruction(new(zone()) HFixedArrayBaseLength(elements));
-  }
-  checked_key = AddInstruction(new(zone()) HBoundsCheck(key, length,
-                                                        ALLOW_SMI_KEY));
-  return BuildFastElementAccess(elements, checked_key, val, mapcheck,
-                                map->elements_kind(), is_store);
-}
-
-
-HInstruction* HGraphBuilder::TryBuildConsolidatedElementLoad(
-    HValue* object,
-    HValue* key,
-    HValue* val,
     SmallMapList* maps) {
   // For polymorphic loads of similar elements kinds (i.e. all tagged or all
   // double), always use the "worst case" code without a transition.  This is
   // much faster than transitioning the elements to the worst case, trading a
   // HTransitionElements for a HCheckMaps, and avoiding mutation of the array.
   bool has_double_maps = false;
   bool has_smi_or_object_maps = false;
   bool has_js_array_access = false;
   bool has_non_js_array_access = false;
   Handle<Map> most_general_consolidated_map;
@@ skipping 24 matching lines @@
             most_general_consolidated_map->elements_kind(),
             map->elements_kind())) {
       most_general_consolidated_map = map;
     }
   }
   if (!has_double_maps && !has_smi_or_object_maps) return NULL;
 
   HCheckMaps* check_maps = new(zone()) HCheckMaps(object, maps, zone());
   AddInstruction(check_maps);
   HInstruction* instr = BuildUncheckedMonomorphicElementAccess(
-      object, key, val, check_maps, most_general_consolidated_map, false);
+      object, key, val, check_maps,
+      most_general_consolidated_map->instance_type() == JS_ARRAY_TYPE,
+      most_general_consolidated_map->elements_kind(),
+      false);
   return instr;
 }
 
 
-HValue* HGraphBuilder::HandlePolymorphicElementAccess(HValue* object,
-                                                      HValue* key,
-                                                      HValue* val,
-                                                      Expression* prop,
-                                                      BailoutId ast_id,
-                                                      int position,
-                                                      bool is_store,
-                                                      bool* has_side_effects) {
+HValue* HOptimizedGraphBuilder::HandlePolymorphicElementAccess(
+    HValue* object,
+    HValue* key,
+    HValue* val,
+    Expression* prop,
+    BailoutId ast_id,
+    int position,
+    bool is_store,
+    bool* has_side_effects) {
   *has_side_effects = false;
   AddInstruction(new(zone()) HCheckNonSmi(object));
   SmallMapList* maps = prop->GetReceiverTypes();
   bool todo_external_array = false;
 
   if (!is_store) {
     HInstruction* consolidated_load =
         TryBuildConsolidatedElementLoad(object, key, val, maps);
     if (consolidated_load != NULL) {
       AddInstruction(consolidated_load);
@@ skipping 164 matching lines @@
             elements, checked_key, val, elements_kind_branch,
             elements_kind, is_store));
       } else if (elements_kind == DICTIONARY_ELEMENTS) {
         if (is_store) {
           access = AddInstruction(BuildStoreKeyedGeneric(object, key, val));
         } else {
           access = AddInstruction(BuildLoadKeyedGeneric(object, key));
         }
       } else {  // External array elements.
         access = AddInstruction(BuildExternalArrayElementAccess(
-            external_elements, checked_key, val, elements_kind_branch,
-            elements_kind, is_store));
+            external_elements, checked_key, val,
+            elements_kind_branch, elements_kind, is_store));
       }
       *has_side_effects |= access->HasObservableSideEffects();
       if (position != RelocInfo::kNoPosition) access->set_position(position);
       if (!is_store) {
         Push(access);
       }
       current_block()->Goto(join);
       set_current_block(if_false);
     }
   }
 
   // Deopt if none of the cases matched.
   current_block()->FinishExitWithDeoptimization(HDeoptimize::kNoUses);
   join->SetJoinId(ast_id);
   set_current_block(join);
   return is_store ? NULL : Pop();
 }
 
 
-HValue* HGraphBuilder::HandleKeyedElementAccess(HValue* obj,
-                                                HValue* key,
-                                                HValue* val,
-                                                Expression* expr,
-                                                BailoutId ast_id,
-                                                int position,
-                                                bool is_store,
-                                                bool* has_side_effects) {
+HValue* HOptimizedGraphBuilder::HandleKeyedElementAccess(
+    HValue* obj,
+    HValue* key,
+    HValue* val,
+    Expression* expr,
+    BailoutId ast_id,
+    int position,
+    bool is_store,
+    bool* has_side_effects) {
   ASSERT(!expr->IsPropertyName());
   HInstruction* instr = NULL;
   if (expr->IsMonomorphic()) {
     Handle<Map> map = expr->GetMonomorphicReceiverType();
     if (map->has_slow_elements_kind()) {
       instr = is_store ? BuildStoreKeyedGeneric(obj, key, val)
                        : BuildLoadKeyedGeneric(obj, key);
     } else {
       AddInstruction(new(zone()) HCheckNonSmi(obj));
       instr = BuildMonomorphicElementAccess(obj, key, val, NULL, map, is_store);
     }
   } else if (expr->GetReceiverTypes() != NULL &&
              !expr->GetReceiverTypes()->is_empty()) {
     return HandlePolymorphicElementAccess(
         obj, key, val, expr, ast_id, position, is_store, has_side_effects);
   } else {
     if (is_store) {
       instr = BuildStoreKeyedGeneric(obj, key, val);
     } else {
       instr = BuildLoadKeyedGeneric(obj, key);
     }
   }
   if (position != RelocInfo::kNoPosition) instr->set_position(position);
   AddInstruction(instr);
   *has_side_effects = instr->HasObservableSideEffects();
   return instr;
 }
 
 
-HInstruction* HGraphBuilder::BuildStoreKeyedGeneric(HValue* object,
-                                                    HValue* key,
-                                                    HValue* value) {
+HInstruction* HOptimizedGraphBuilder::BuildStoreKeyedGeneric(
+    HValue* object,
+    HValue* key,
+    HValue* value) {
   HValue* context = environment()->LookupContext();
   return new(zone()) HStoreKeyedGeneric(
                          context,
                          object,
                          key,
                          value,
                          function_strict_mode_flag());
 }
 
 
-void HGraphBuilder::EnsureArgumentsArePushedForAccess() {
+void HOptimizedGraphBuilder::EnsureArgumentsArePushedForAccess() {
   // Outermost function already has arguments on the stack.
   if (function_state()->outer() == NULL) return;
 
   if (function_state()->arguments_pushed()) return;
 
   // Push arguments when entering inlined function.
   HEnterInlined* entry = function_state()->entry();
   entry->set_arguments_pushed();
 
   ZoneList<HValue*>* arguments_values = entry->arguments_values();
 
   HInstruction* insert_after = entry;
   for (int i = 0; i < arguments_values->length(); i++) {
     HValue* argument = arguments_values->at(i);
     HInstruction* push_argument = new(zone()) HPushArgument(argument);
     push_argument->InsertAfter(insert_after);
     insert_after = push_argument;
   }
 
   HArgumentsElements* arguments_elements =
       new(zone()) HArgumentsElements(true);
   arguments_elements->ClearFlag(HValue::kUseGVN);
   arguments_elements->InsertAfter(insert_after);
   function_state()->set_arguments_elements(arguments_elements);
 }
 
 
-bool HGraphBuilder::TryArgumentsAccess(Property* expr) {
+bool HOptimizedGraphBuilder::TryArgumentsAccess(Property* expr) {
   VariableProxy* proxy = expr->obj()->AsVariableProxy();
   if (proxy == NULL) return false;
   if (!proxy->var()->IsStackAllocated()) return false;
   if (!environment()->Lookup(proxy->var())->CheckFlag(HValue::kIsArguments)) {
     return false;
   }
 
   HInstruction* result = NULL;
   if (expr->key()->IsPropertyName()) {
     Handle<String> name = expr->key()->AsLiteral()->AsPropertyName();
@@ skipping 38 matching lines @@
       HInstruction* checked_key =
           AddInstruction(new(zone()) HBoundsCheck(key, length));
       result = new(zone()) HAccessArgumentsAt(elements, length, checked_key);
     }
   }
   ast_context()->ReturnInstruction(result, expr->id());
   return true;
 }
 
 
-void HGraphBuilder::VisitProperty(Property* expr) {
+void HOptimizedGraphBuilder::VisitProperty(Property* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   expr->RecordTypeFeedback(oracle(), zone());
 
   if (TryArgumentsAccess(expr)) return;
 
   CHECK_ALIVE(VisitForValue(expr->obj()));
 
   HInstruction* instr = NULL;
@@ skipping 70 matching lines @@
         Drop(1);
       }
     }
     return ast_context()->ReturnValue(load);
   }
   instr->set_position(expr->position());
   return ast_context()->ReturnInstruction(instr, expr->id());
 }
 
 
-void HGraphBuilder::AddCheckPrototypeMaps(Handle<JSObject> holder,
-                                          Handle<Map> receiver_map) {
+void HOptimizedGraphBuilder::AddCheckPrototypeMaps(Handle<JSObject> holder,
+                                                   Handle<Map> receiver_map) {
   if (!holder.is_null()) {
     AddInstruction(new(zone()) HCheckPrototypeMaps(
         Handle<JSObject>(JSObject::cast(receiver_map->prototype())), holder));
   }
 }
 
 
-void HGraphBuilder::AddCheckConstantFunction(Handle<JSObject> holder,
-                                             HValue* receiver,
-                                             Handle<Map> receiver_map) {
+void HOptimizedGraphBuilder::AddCheckConstantFunction(
+    Handle<JSObject> holder,
+    HValue* receiver,
+    Handle<Map> receiver_map) {
   // Constant functions have the nice property that the map will change if they
   // are overwritten.  Therefore it is enough to check the map of the holder and
   // its prototypes.
   AddCheckMapsWithTransitions(receiver, receiver_map);
   AddCheckPrototypeMaps(holder, receiver_map);
 }
 
 
 class FunctionSorter {
  public:
@@ skipping 21 matching lines @@
   FunctionSorter const* function1 = reinterpret_cast<FunctionSorter const*>(a);
   FunctionSorter const* function2 = reinterpret_cast<FunctionSorter const*>(b);
   int diff = function1->ticks() - function2->ticks();
   if (diff != 0) return -diff;
   diff = function1->ast_length() - function2->ast_length();
   if (diff != 0) return diff;
   return function1->src_length() - function2->src_length();
 }
 
 
-void HGraphBuilder::HandlePolymorphicCallNamed(Call* expr,
-                                               HValue* receiver,
-                                               SmallMapList* types,
-                                               Handle<String> name) {
+void HOptimizedGraphBuilder::HandlePolymorphicCallNamed(
+    Call* expr,
+    HValue* receiver,
+    SmallMapList* types,
+    Handle<String> name) {
   // TODO(ager): We should recognize when the prototype chains for different
   // maps are identical. In that case we can avoid repeatedly generating the
   // same prototype map checks.
   int argument_count = expr->arguments()->length() + 1;  // Includes receiver.
   HBasicBlock* join = NULL;
   FunctionSorter order[kMaxCallPolymorphism];
   int ordered_functions = 0;
   for (int i = 0;
        i < types->length() && ordered_functions < kMaxCallPolymorphism;
        ++i) {
@@ skipping 81 matching lines @@
   if (join->HasPredecessor()) {
     set_current_block(join);
     join->SetJoinId(expr->id());
     if (!ast_context()->IsEffect()) return ast_context()->ReturnValue(Pop());
   } else {
     set_current_block(NULL);
   }
 }
 
 
-void HGraphBuilder::TraceInline(Handle<JSFunction> target,
-                                Handle<JSFunction> caller,
-                                const char* reason) {
+void HOptimizedGraphBuilder::TraceInline(Handle<JSFunction> target,
+                                         Handle<JSFunction> caller,
+                                         const char* reason) {
   if (FLAG_trace_inlining) {
     SmartArrayPointer<char> target_name =
         target->shared()->DebugName()->ToCString();
     SmartArrayPointer<char> caller_name =
         caller->shared()->DebugName()->ToCString();
     if (reason == NULL) {
       PrintF("Inlined %s called from %s.\n", *target_name, *caller_name);
     } else {
       PrintF("Did not inline %s called from %s (%s).\n",
              *target_name, *caller_name, reason);
     }
   }
 }
 
 
 static const int kNotInlinable = 1000000000;
 
 
-int HGraphBuilder::InliningAstSize(Handle<JSFunction> target) {
+int HOptimizedGraphBuilder::InliningAstSize(Handle<JSFunction> target) {
   if (!FLAG_use_inlining) return kNotInlinable;
 
   // Precondition: call is monomorphic and we have found a target with the
   // appropriate arity.
   Handle<JSFunction> caller = info()->closure();
   Handle<SharedFunctionInfo> target_shared(target->shared());
 
   // Do a quick check on source code length to avoid parsing large
   // inlining candidates.
   if (target_shared->SourceSize() >
@@ skipping 10 matching lines @@
   if (target_shared->dont_inline() || target_shared->dont_optimize()) {
     TraceInline(target, caller, "target contains unsupported syntax [early]");
     return kNotInlinable;
   }
 
   int nodes_added = target_shared->ast_node_count();
   return nodes_added;
 }
 
 
-bool HGraphBuilder::TryInline(CallKind call_kind,
-                              Handle<JSFunction> target,
-                              int arguments_count,
-                              HValue* implicit_return_value,
-                              BailoutId ast_id,
-                              BailoutId return_id,
-                              InliningKind inlining_kind) {
+bool HOptimizedGraphBuilder::TryInline(CallKind call_kind,
+                                       Handle<JSFunction> target,
+                                       int arguments_count,
+                                       HValue* implicit_return_value,
+                                       BailoutId ast_id,
+                                       BailoutId return_id,
+                                       InliningKind inlining_kind) {
   int nodes_added = InliningAstSize(target);
   if (nodes_added == kNotInlinable) return false;
 
   Handle<JSFunction> caller = info()->closure();
 
   if (nodes_added > Min(FLAG_max_inlined_nodes, kUnlimitedMaxInlinedNodes)) {
     TraceInline(target, caller, "target AST is too large [early]");
     return false;
   }
 
@@ skipping 288 matching lines @@
     function_return()->SetJoinId(ast_id);
     set_current_block(function_return());
   } else {
     set_current_block(NULL);
   }
   delete target_state;
   return true;
 }
 
 
-bool HGraphBuilder::TryInlineCall(Call* expr, bool drop_extra) {
+bool HOptimizedGraphBuilder::TryInlineCall(Call* expr, bool drop_extra) {
   // The function call we are inlining is a method call if the call
   // is a property call.
   CallKind call_kind = (expr->expression()->AsProperty() == NULL)
       ? CALL_AS_FUNCTION
       : CALL_AS_METHOD;
 
   return TryInline(call_kind,
                    expr->target(),
                    expr->arguments()->length(),
                    NULL,
                    expr->id(),
                    expr->ReturnId(),
                    drop_extra ? DROP_EXTRA_ON_RETURN : NORMAL_RETURN);
 }
 
 
-bool HGraphBuilder::TryInlineConstruct(CallNew* expr,
-                                       HValue* implicit_return_value) {
+bool HOptimizedGraphBuilder::TryInlineConstruct(CallNew* expr,
+                                                HValue* implicit_return_value) {
   return TryInline(CALL_AS_FUNCTION,
                    expr->target(),
                    expr->arguments()->length(),
                    implicit_return_value,
                    expr->id(),
                    expr->ReturnId(),
                    CONSTRUCT_CALL_RETURN);
 }
 
 
-bool HGraphBuilder::TryInlineGetter(Handle<JSFunction> getter,
-                                    Property* prop) {
+bool HOptimizedGraphBuilder::TryInlineGetter(Handle<JSFunction> getter,
+                                             Property* prop) {
   return TryInline(CALL_AS_METHOD,
                    getter,
                    0,
                    NULL,
                    prop->id(),
                    prop->LoadId(),
                    GETTER_CALL_RETURN);
 }
 
 
-bool HGraphBuilder::TryInlineSetter(Handle<JSFunction> setter,
-                                    Assignment* assignment,
-                                    HValue* implicit_return_value) {
+bool HOptimizedGraphBuilder::TryInlineSetter(Handle<JSFunction> setter,
+                                             Assignment* assignment,
+                                             HValue* implicit_return_value) {
   return TryInline(CALL_AS_METHOD,
                    setter,
                    1,
                    implicit_return_value,
                    assignment->id(),
                    assignment->AssignmentId(),
                    SETTER_CALL_RETURN);
 }
 
 
-bool HGraphBuilder::TryInlineBuiltinFunctionCall(Call* expr, bool drop_extra) {
+bool HOptimizedGraphBuilder::TryInlineBuiltinFunctionCall(Call* expr,
+                                                          bool drop_extra) {
   if (!expr->target()->shared()->HasBuiltinFunctionId()) return false;
   BuiltinFunctionId id = expr->target()->shared()->builtin_function_id();
   switch (id) {
     case kMathExp:
       if (!FLAG_fast_math) break;
       // Fall through if FLAG_fast_math.
     case kMathRound:
     case kMathAbs:
     case kMathSqrt:
     case kMathLog:
@@ skipping 13 matching lines @@
       }
       break;
     default:
       // Not supported for inlining yet.
       break;
   }
   return false;
 }
 
 
-bool HGraphBuilder::TryInlineBuiltinMethodCall(Call* expr,
-                                               HValue* receiver,
-                                               Handle<Map> receiver_map,
-                                               CheckType check_type) {
+bool HOptimizedGraphBuilder::TryInlineBuiltinMethodCall(
+    Call* expr,
+    HValue* receiver,
+    Handle<Map> receiver_map,
+    CheckType check_type) {
   ASSERT(check_type != RECEIVER_MAP_CHECK || !receiver_map.is_null());
   // Try to inline calls like Math.* as operations in the calling function.
   if (!expr->target()->shared()->HasBuiltinFunctionId()) return false;
   BuiltinFunctionId id = expr->target()->shared()->builtin_function_id();
   int argument_count = expr->arguments()->length() + 1;  // Plus receiver.
   switch (id) {
     case kStringCharCodeAt:
     case kStringCharAt:
       if (argument_count == 2 && check_type == STRING_CHECK) {
         HValue* index = Pop();
@@ skipping 109 matching lines @@
       }
       break;
     default:
       // Not yet supported for inlining.
       break;
   }
   return false;
 }
 
 
-bool HGraphBuilder::TryCallApply(Call* expr) {
+bool HOptimizedGraphBuilder::TryCallApply(Call* expr) {
   Expression* callee = expr->expression();
   Property* prop = callee->AsProperty();
   ASSERT(prop != NULL);
 
   if (!expr->IsMonomorphic() || expr->check_type() != RECEIVER_MAP_CHECK) {
     return false;
   }
   Handle<Map> function_map = expr->GetReceiverTypes()->first();
   if (function_map->instance_type() != JS_FUNCTION_TYPE ||
       !expr->target()->shared()->HasBuiltinFunctionId() ||
@@ skipping 107 matching lines @@
         return NULL;
       }
       current = next;
     }
   }
 
   return kinds[first_index];
 }
 
 
-void HGraphBuilder::VisitCall(Call* expr) {
+void HOptimizedGraphBuilder::VisitCall(Call* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   Expression* callee = expr->expression();
   int argument_count = expr->arguments()->length() + 1;  // Plus receiver.
   HInstruction* call = NULL;
 
   Property* prop = callee->AsProperty();
   if (prop != NULL) {
     if (!prop->key()->IsPropertyName()) {
@@ skipping 209 matching lines @@
 
 
 // Checks whether allocation using the given constructor can be inlined.
 static bool IsAllocationInlineable(Handle<JSFunction> constructor) {
   return constructor->has_initial_map() &&
       constructor->initial_map()->instance_type() == JS_OBJECT_TYPE &&
       constructor->initial_map()->instance_size() < HAllocateObject::kMaxSize;
 }
 
 
-void HGraphBuilder::VisitCallNew(CallNew* expr) {
+void HOptimizedGraphBuilder::VisitCallNew(CallNew* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   expr->RecordTypeFeedback(oracle());
   int argument_count = expr->arguments()->length() + 1;  // Plus constructor.
   HValue* context = environment()->LookupContext();
 
   if (FLAG_inline_construct &&
       expr->IsMonomorphic() &&
       IsAllocationInlineable(expr->target())) {
@@ skipping 43 matching lines @@
         new(zone()) HCallNew(context, constructor, argument_count);
     Drop(argument_count);
     call->set_position(expr->position());
     return ast_context()->ReturnInstruction(call, expr->id());
   }
 }
 
 
 // Support for generating inlined runtime functions.
 
-// Lookup table for generators for runtime calls that are  generated inline.
-// Elements of the table are member pointers to functions of HGraphBuilder.
+// Lookup table for generators for runtime calls that are generated inline.
+// Elements of the table are member pointers to functions of
+// HOptimizedGraphBuilder.
 #define INLINE_FUNCTION_GENERATOR_ADDRESS(Name, argc, ressize)  \
-    &HGraphBuilder::Generate##Name,
+    &HOptimizedGraphBuilder::Generate##Name,
 
-const HGraphBuilder::InlineFunctionGenerator
-    HGraphBuilder::kInlineFunctionGenerators[] = {
+const HOptimizedGraphBuilder::InlineFunctionGenerator
+    HOptimizedGraphBuilder::kInlineFunctionGenerators[] = {
         INLINE_FUNCTION_LIST(INLINE_FUNCTION_GENERATOR_ADDRESS)
         INLINE_RUNTIME_FUNCTION_LIST(INLINE_FUNCTION_GENERATOR_ADDRESS)
 };
 #undef INLINE_FUNCTION_GENERATOR_ADDRESS
 
 
-void HGraphBuilder::VisitCallRuntime(CallRuntime* expr) {
+void HOptimizedGraphBuilder::VisitCallRuntime(CallRuntime* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   if (expr->is_jsruntime()) {
     return Bailout("call to a JavaScript runtime function");
   }
 
   const Runtime::Function* function = expr->function();
   ASSERT(function != NULL);
   if (function->intrinsic_type == Runtime::INLINE) {
@@ skipping 17 matching lines @@
     Handle<String> name = expr->name();
     int argument_count = expr->arguments()->length();
     HCallRuntime* call =
         new(zone()) HCallRuntime(context, name, function, argument_count);
     Drop(argument_count);
     return ast_context()->ReturnInstruction(call, expr->id());
   }
 }
 
 
-void HGraphBuilder::VisitUnaryOperation(UnaryOperation* expr) {
+void HOptimizedGraphBuilder::VisitUnaryOperation(UnaryOperation* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   switch (expr->op()) {
     case Token::DELETE: return VisitDelete(expr);
     case Token::VOID: return VisitVoid(expr);
     case Token::TYPEOF: return VisitTypeof(expr);
     case Token::ADD: return VisitAdd(expr);
     case Token::SUB: return VisitSub(expr);
     case Token::BIT_NOT: return VisitBitNot(expr);
     case Token::NOT: return VisitNot(expr);
     default: UNREACHABLE();
   }
 }
 
-void HGraphBuilder::VisitDelete(UnaryOperation* expr) {
+void HOptimizedGraphBuilder::VisitDelete(UnaryOperation* expr) {
   Property* prop = expr->expression()->AsProperty();
   VariableProxy* proxy = expr->expression()->AsVariableProxy();
   if (prop != NULL) {
     CHECK_ALIVE(VisitForValue(prop->obj()));
     CHECK_ALIVE(VisitForValue(prop->key()));
     HValue* key = Pop();
     HValue* obj = Pop();
     HValue* context = environment()->LookupContext();
     HDeleteProperty* instr = new(zone()) HDeleteProperty(context, obj, key);
     return ast_context()->ReturnInstruction(instr, expr->id());
@@ skipping 14 matching lines @@
     }
   } else {
     // Result of deleting non-property, non-variable reference is true.
     // Evaluate the subexpression for side effects.
     CHECK_ALIVE(VisitForEffect(expr->expression()));
     return ast_context()->ReturnValue(graph()->GetConstantTrue());
   }
 }
 
 
-void HGraphBuilder::VisitVoid(UnaryOperation* expr) {
+void HOptimizedGraphBuilder::VisitVoid(UnaryOperation* expr) {
   CHECK_ALIVE(VisitForEffect(expr->expression()));
   return ast_context()->ReturnValue(graph()->GetConstantUndefined());
 }
 
 
-void HGraphBuilder::VisitTypeof(UnaryOperation* expr) {
+void HOptimizedGraphBuilder::VisitTypeof(UnaryOperation* expr) {
   CHECK_ALIVE(VisitForTypeOf(expr->expression()));
   HValue* value = Pop();
   HValue* context = environment()->LookupContext();
   HInstruction* instr = new(zone()) HTypeof(context, value);
   return ast_context()->ReturnInstruction(instr, expr->id());
 }
 
 
-void HGraphBuilder::VisitAdd(UnaryOperation* expr) {
+void HOptimizedGraphBuilder::VisitAdd(UnaryOperation* expr) {
   CHECK_ALIVE(VisitForValue(expr->expression()));
   HValue* value = Pop();
   HValue* context = environment()->LookupContext();
   HInstruction* instr =
-      new(zone()) HMul(context, value, graph_->GetConstant1());
+      new(zone()) HMul(context, value, graph()->GetConstant1());
   return ast_context()->ReturnInstruction(instr, expr->id());
 }
 
 
-void HGraphBuilder::VisitSub(UnaryOperation* expr) {
+void HOptimizedGraphBuilder::VisitSub(UnaryOperation* expr) {
   CHECK_ALIVE(VisitForValue(expr->expression()));
   HValue* value = Pop();
   HValue* context = environment()->LookupContext();
   HInstruction* instr =
-      new(zone()) HMul(context, value, graph_->GetConstantMinus1());
+      new(zone()) HMul(context, value, graph()->GetConstantMinus1());
   TypeInfo info = oracle()->UnaryType(expr);
   Representation rep = ToRepresentation(info);
   if (info.IsUninitialized()) {
     AddInstruction(new(zone()) HSoftDeoptimize);
     current_block()->MarkAsDeoptimizing();
     info = TypeInfo::Unknown();
   }
   HBinaryOperation::cast(instr)->set_observed_input_representation(rep, rep);
   return ast_context()->ReturnInstruction(instr, expr->id());
 }
 
 
-void HGraphBuilder::VisitBitNot(UnaryOperation* expr) {
+void HOptimizedGraphBuilder::VisitBitNot(UnaryOperation* expr) {
   CHECK_ALIVE(VisitForValue(expr->expression()));
   HValue* value = Pop();
   TypeInfo info = oracle()->UnaryType(expr);
   if (info.IsUninitialized()) {
     AddInstruction(new(zone()) HSoftDeoptimize);
     current_block()->MarkAsDeoptimizing();
   }
   HInstruction* instr = new(zone()) HBitNot(value);
   return ast_context()->ReturnInstruction(instr, expr->id());
 }
 
 
-void HGraphBuilder::VisitNot(UnaryOperation* expr) {
+void HOptimizedGraphBuilder::VisitNot(UnaryOperation* expr) {
   if (ast_context()->IsTest()) {
     TestContext* context = TestContext::cast(ast_context());
     VisitForControl(expr->expression(),
                     context->if_false(),
                     context->if_true());
     return;
   }
 
   if (ast_context()->IsEffect()) {
     VisitForEffect(expr->expression());
@@ skipping 23 matching lines @@
     materialize_true = NULL;
   }
 
   HBasicBlock* join =
     CreateJoin(materialize_false, materialize_true, expr->id());
   set_current_block(join);
   if (join != NULL) return ast_context()->ReturnValue(Pop());
 }
 
 
-HInstruction* HGraphBuilder::BuildIncrement(bool returns_original_input,
-                                            CountOperation* expr) {
+HInstruction* HOptimizedGraphBuilder::BuildIncrement(
+    bool returns_original_input,
+    CountOperation* expr) {
   // The input to the count operation is on top of the expression stack.
   TypeInfo info = oracle()->IncrementType(expr);
   Representation rep = ToRepresentation(info);
   if (rep.IsTagged()) {
     rep = Representation::Integer32();
   }
 
   if (returns_original_input) {
     // We need an explicit HValue representing ToNumber(input).  The
     // actual HChange instruction we need is (sometimes) added in a later
     // phase, so it is not available now to be used as an input to HAdd and
     // as the return value.
     HInstruction* number_input = new(zone()) HForceRepresentation(Pop(), rep);
     AddInstruction(number_input);
     Push(number_input);
   }
 
   // The addition has no side effects, so we do not need
   // to simulate the expression stack after this instruction.
   // Any later failures deopt to the load of the input or earlier.
   HConstant* delta = (expr->op() == Token::INC)
-      ? graph_->GetConstant1()
-      : graph_->GetConstantMinus1();
+      ? graph()->GetConstant1()
+      : graph()->GetConstantMinus1();
   HValue* context = environment()->LookupContext();
   HInstruction* instr = new(zone()) HAdd(context, Top(), delta);
   // We can't insert a simulate here, because it would break deoptimization,
   // so the HAdd must not have side effects, so we must freeze its
   // representation.
   instr->AssumeRepresentation(rep);
   instr->ClearAllSideEffects();
   AddInstruction(instr);
   return instr;
 }
 
 
-void HGraphBuilder::VisitCountOperation(CountOperation* expr) {
+void HOptimizedGraphBuilder::VisitCountOperation(CountOperation* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   Expression* target = expr->expression();
   VariableProxy* proxy = target->AsVariableProxy();
   Property* prop = target->AsProperty();
   if (proxy == NULL && prop == NULL) {
     return Bailout("invalid lhs in count operation");
   }
 
@@ skipping 63 matching lines @@
         return Bailout("lookup variable in count operation");
     }
 
   } else {
     // Argument of the count operation is a property.
     ASSERT(prop != NULL);
     prop->RecordTypeFeedback(oracle(), zone());
 
     if (prop->key()->IsPropertyName()) {
       // Named property.
-      if (returns_original_input) Push(graph_->GetConstantUndefined());
+      if (returns_original_input) Push(graph()->GetConstantUndefined());
 
       CHECK_ALIVE(VisitForValue(prop->obj()));
       HValue* object = Top();
 
       Handle<String> name = prop->key()->AsLiteral()->AsPropertyName();
       Handle<Map> map;
       HInstruction* load;
       bool monomorphic = prop->IsMonomorphic();
       if (monomorphic) {
         map = prop->GetReceiverTypes()->first();
@@ skipping 40 matching lines @@
       // of the operation, and the placeholder with the original value if
       // necessary.
       environment()->SetExpressionStackAt(0, after);
       if (returns_original_input) environment()->SetExpressionStackAt(1, input);
       if (store->HasObservableSideEffects()) {
         AddSimulate(expr->AssignmentId(), REMOVABLE_SIMULATE);
       }
 
     } else {
       // Keyed property.
-      if (returns_original_input) Push(graph_->GetConstantUndefined());
+      if (returns_original_input) Push(graph()->GetConstantUndefined());
 
       CHECK_ALIVE(VisitForValue(prop->obj()));
       CHECK_ALIVE(VisitForValue(prop->key()));
       HValue* obj = environment()->ExpressionStackAt(1);
       HValue* key = environment()->ExpressionStackAt(0);
 
       bool has_side_effects = false;
       HValue* load = HandleKeyedElementAccess(
           obj, key, NULL, prop, prop->LoadId(), RelocInfo::kNoPosition,
           false,  // is_store
@@ skipping 19 matching lines @@
       ASSERT(has_side_effects);  // Stores always have side effects.
       AddSimulate(expr->AssignmentId(), REMOVABLE_SIMULATE);
     }
   }
 
   Drop(returns_original_input ? 2 : 1);
   return ast_context()->ReturnValue(expr->is_postfix() ? input : after);
 }
 
 
-HStringCharCodeAt* HGraphBuilder::BuildStringCharCodeAt(HValue* context,
-                                                        HValue* string,
-                                                        HValue* index) {
+HStringCharCodeAt* HOptimizedGraphBuilder::BuildStringCharCodeAt(
+    HValue* context,
+    HValue* string,
+    HValue* index) {
   AddInstruction(new(zone()) HCheckNonSmi(string));
   AddInstruction(HCheckInstanceType::NewIsString(string, zone()));
   HStringLength* length = new(zone()) HStringLength(string);
   AddInstruction(length);
   HInstruction* checked_index =
       AddInstruction(new(zone()) HBoundsCheck(index, length));
   return new(zone()) HStringCharCodeAt(context, string, checked_index);
 }
 
 // Checks if the given shift amounts have form: (sa) and (32 - sa).
 static bool ShiftAmountsAllowReplaceByRotate(HValue* sa,
                                              HValue* const32_minus_sa) {
   if (!const32_minus_sa->IsSub()) return false;
   HSub* sub = HSub::cast(const32_minus_sa);
   HValue* const32 = sub->left();
   if (!const32->IsConstant() ||
       HConstant::cast(const32)->Integer32Value() != 32) {
     return false;
   }
   return (sub->right() == sa);
 }
 
 
 // Checks if the left and the right are shift instructions with the oposite
 // directions that can be replaced by one rotate right instruction or not.
 // Returns the operand and the shift amount for the rotate instruction in the
 // former case.
-bool HGraphBuilder::MatchRotateRight(HValue* left,
-                                     HValue* right,
-                                     HValue** operand,
-                                     HValue** shift_amount) {
+bool HOptimizedGraphBuilder::MatchRotateRight(HValue* left,
+                                              HValue* right,
+                                              HValue** operand,
+                                              HValue** shift_amount) {
   HShl* shl;
   HShr* shr;
   if (left->IsShl() && right->IsShr()) {
     shl = HShl::cast(left);
     shr = HShr::cast(right);
   } else if (left->IsShr() && right->IsShl()) {
     shl = HShl::cast(right);
     shr = HShr::cast(left);
   } else {
     return false;
@@ skipping 14 matching lines @@
     HConstant* right_const = HConstant::cast(right);
     if (right_const->HasInteger32Value() &&
        (right_const->Integer32Value() & 0x1f) != 0) {
       return false;
     }
   }
   return true;
 }
 
 
-HInstruction* HGraphBuilder::BuildBinaryOperation(BinaryOperation* expr,
-                                                  HValue* left,
-                                                  HValue* right) {
+HInstruction* HOptimizedGraphBuilder::BuildBinaryOperation(
+    BinaryOperation* expr,
+    HValue* left,
+    HValue* right) {
   HValue* context = environment()->LookupContext();
   TypeInfo left_info, right_info, result_info, combined_info;
   oracle()->BinaryType(expr, &left_info, &right_info, &result_info);
   Representation left_rep = ToRepresentation(left_info);
   Representation right_rep = ToRepresentation(right_info);
   Representation result_rep = ToRepresentation(result_info);
   if (left_info.IsUninitialized()) {
     // Can't have initialized one but not the other.
     ASSERT(right_info.IsUninitialized());
     AddInstruction(new(zone()) HSoftDeoptimize);
@@ skipping 72 matching lines @@
   if (call == NULL) return false;
   Literal* literal = expr->right()->AsLiteral();
   if (literal == NULL) return false;
   if (!literal->handle()->IsString()) return false;
   if (!call->name()->IsEqualTo(CStrVector("_ClassOf"))) return false;
   ASSERT(call->arguments()->length() == 1);
   return true;
 }
 
 
-void HGraphBuilder::VisitBinaryOperation(BinaryOperation* expr) {
+void HOptimizedGraphBuilder::VisitBinaryOperation(BinaryOperation* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   switch (expr->op()) {
     case Token::COMMA:
       return VisitComma(expr);
     case Token::OR:
     case Token::AND:
       return VisitLogicalExpression(expr);
     default:
       return VisitArithmeticExpression(expr);
   }
 }
 
 
-void HGraphBuilder::VisitComma(BinaryOperation* expr) {
+void HOptimizedGraphBuilder::VisitComma(BinaryOperation* expr) {
   CHECK_ALIVE(VisitForEffect(expr->left()));
   // Visit the right subexpression in the same AST context as the entire
   // expression.
   Visit(expr->right());
 }
 
 
-void HGraphBuilder::VisitLogicalExpression(BinaryOperation* expr) {
+void HOptimizedGraphBuilder::VisitLogicalExpression(BinaryOperation* expr) {
   bool is_logical_and = expr->op() == Token::AND;
   if (ast_context()->IsTest()) {
     TestContext* context = TestContext::cast(ast_context());
     // Translate left subexpression.
     HBasicBlock* eval_right = graph()->CreateBasicBlock();
     if (is_logical_and) {
       CHECK_BAILOUT(VisitForControl(expr->left(),
                                     eval_right,
                                     context->if_false()));
     } else {
@@ skipping 69 matching lines @@
 
     HBasicBlock* join_block =
       CreateJoin(empty_block, right_block, expr->id());
     set_current_block(join_block);
     // We did not materialize any value in the predecessor environments,
     // so there is no need to handle it here.
   }
 }
 
 
-void HGraphBuilder::VisitArithmeticExpression(BinaryOperation* expr) {
+void HOptimizedGraphBuilder::VisitArithmeticExpression(BinaryOperation* expr) {
   CHECK_ALIVE(VisitForValue(expr->left()));
   CHECK_ALIVE(VisitForValue(expr->right()));
   HValue* right = Pop();
   HValue* left = Pop();
   HInstruction* instr = BuildBinaryOperation(expr, left, right);
   instr->set_position(expr->position());
   return ast_context()->ReturnInstruction(instr, expr->id());
 }
 
 
-Representation HGraphBuilder::ToRepresentation(TypeInfo info) {
+Representation HOptimizedGraphBuilder::ToRepresentation(TypeInfo info) {
   if (info.IsUninitialized()) return Representation::None();
   if (info.IsSmi()) return Representation::Integer32();
   if (info.IsInteger32()) return Representation::Integer32();
   if (info.IsDouble()) return Representation::Double();
   if (info.IsNumber()) return Representation::Double();
   return Representation::Tagged();
 }
 
 
-void HGraphBuilder::HandleLiteralCompareTypeof(CompareOperation* expr,
-                                               HTypeof* typeof_expr,
-                                               Handle<String> check) {
+void HOptimizedGraphBuilder::HandleLiteralCompareTypeof(CompareOperation* expr,
+                                                        HTypeof* typeof_expr,
+                                                        Handle<String> check) {
   // Note: The HTypeof itself is removed during canonicalization, if possible.
   HValue* value = typeof_expr->value();
   HTypeofIsAndBranch* instr = new(zone()) HTypeofIsAndBranch(value, check);
   instr->set_position(expr->position());
   return ast_context()->ReturnControl(instr, expr->id());
 }
 
 
 static bool MatchLiteralCompareNil(HValue* left,
                                    Token::Value op,
@@ skipping 49 matching lines @@
 
 static bool IsLiteralCompareBool(HValue* left,
                                  Token::Value op,
                                  HValue* right) {
   return op == Token::EQ_STRICT &&
       ((left->IsConstant() && HConstant::cast(left)->handle()->IsBoolean()) ||
        (right->IsConstant() && HConstant::cast(right)->handle()->IsBoolean()));
 }
 
 
-void HGraphBuilder::VisitCompareOperation(CompareOperation* expr) {
+void HOptimizedGraphBuilder::VisitCompareOperation(CompareOperation* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   if (IsClassOfTest(expr)) {
     CallRuntime* call = expr->left()->AsCallRuntime();
     ASSERT(call->arguments()->length() == 1);
     CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
     HValue* value = Pop();
     Literal* literal = expr->right()->AsLiteral();
     Handle<String> rhs = Handle<String>::cast(literal->handle());
@@ skipping 132 matching lines @@
       HCompareIDAndBranch* result =
           new(zone()) HCompareIDAndBranch(left, right, op);
       result->set_observed_input_representation(left_rep, right_rep);
       result->set_position(expr->position());
       return ast_context()->ReturnControl(result, expr->id());
     }
   }
 }
 
 
-void HGraphBuilder::HandleLiteralCompareNil(CompareOperation* expr,
-                                            HValue* value,
-                                            NilValue nil) {
+void HOptimizedGraphBuilder::HandleLiteralCompareNil(CompareOperation* expr,
+                                                     HValue* value,
+                                                     NilValue nil) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   EqualityKind kind =
       expr->op() == Token::EQ_STRICT ? kStrictEquality : kNonStrictEquality;
   HIsNilAndBranch* instr = new(zone()) HIsNilAndBranch(value, kind, nil);
   instr->set_position(expr->position());
   return ast_context()->ReturnControl(instr, expr->id());
 }
 
 
-HInstruction* HGraphBuilder::BuildThisFunction() {
+HInstruction* HOptimizedGraphBuilder::BuildThisFunction() {
   // If we share optimized code between different closures, the
   // this-function is not a constant, except inside an inlined body.
   if (function_state()->outer() != NULL) {
       return new(zone()) HConstant(
           function_state()->compilation_info()->closure(),
           Representation::Tagged());
   } else {
       return new(zone()) HThisFunction;
   }
 }
 
 
-void HGraphBuilder::VisitThisFunction(ThisFunction* expr) {
+void HOptimizedGraphBuilder::VisitThisFunction(ThisFunction* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   HInstruction* instr = BuildThisFunction();
   return ast_context()->ReturnInstruction(instr, expr->id());
 }
 
 
-void HGraphBuilder::VisitDeclarations(ZoneList<Declaration*>* declarations) {
+void HOptimizedGraphBuilder::VisitDeclarations(
+    ZoneList<Declaration*>* declarations) {
   ASSERT(globals_.is_empty());
   AstVisitor::VisitDeclarations(declarations);
   if (!globals_.is_empty()) {
     Handle<FixedArray> array =
        isolate()->factory()->NewFixedArray(globals_.length(), TENURED);
     for (int i = 0; i < globals_.length(); ++i) array->set(i, *globals_.at(i));
     int flags = DeclareGlobalsEvalFlag::encode(info()->is_eval()) |
                 DeclareGlobalsNativeFlag::encode(info()->is_native()) |
                 DeclareGlobalsLanguageMode::encode(info()->language_mode());
     HInstruction* result = new(zone()) HDeclareGlobals(
         environment()->LookupContext(), array, flags);
     AddInstruction(result);
     globals_.Clear();
   }
 }
 
 
-void HGraphBuilder::VisitVariableDeclaration(VariableDeclaration* declaration) {
+void HOptimizedGraphBuilder::VisitVariableDeclaration(
+    VariableDeclaration* declaration) {
   VariableProxy* proxy = declaration->proxy();
   VariableMode mode = declaration->mode();
   Variable* variable = proxy->var();
   bool hole_init = mode == CONST || mode == CONST_HARMONY || mode == LET;
   switch (variable->location()) {
     case Variable::UNALLOCATED:
       globals_.Add(variable->name(), zone());
       globals_.Add(variable->binding_needs_init()
                        ? isolate()->factory()->the_hole_value()
                        : isolate()->factory()->undefined_value(), zone());
@@ skipping 16 matching lines @@
           AddSimulate(proxy->id(), REMOVABLE_SIMULATE);
         }
       }
       break;
     case Variable::LOOKUP:
       return Bailout("unsupported lookup slot in declaration");
   }
 }
 
 
-void HGraphBuilder::VisitFunctionDeclaration(FunctionDeclaration* declaration) {
+void HOptimizedGraphBuilder::VisitFunctionDeclaration(
+    FunctionDeclaration* declaration) {
   VariableProxy* proxy = declaration->proxy();
   Variable* variable = proxy->var();
   switch (variable->location()) {
     case Variable::UNALLOCATED: {
       globals_.Add(variable->name(), zone());
       Handle<SharedFunctionInfo> function =
           Compiler::BuildFunctionInfo(declaration->fun(), info()->script());
       // Check for stack-overflow exception.
       if (function.is_null()) return SetStackOverflow();
       globals_.Add(function, zone());
@@ skipping 17 matching lines @@
         AddSimulate(proxy->id(), REMOVABLE_SIMULATE);
       }
       break;
     }
     case Variable::LOOKUP:
       return Bailout("unsupported lookup slot in declaration");
   }
 }
 
 
-void HGraphBuilder::VisitModuleDeclaration(ModuleDeclaration* declaration) {
+void HOptimizedGraphBuilder::VisitModuleDeclaration(
+    ModuleDeclaration* declaration) {
   UNREACHABLE();
 }
 
 
-void HGraphBuilder::VisitImportDeclaration(ImportDeclaration* declaration) {
+void HOptimizedGraphBuilder::VisitImportDeclaration(
+    ImportDeclaration* declaration) {
   UNREACHABLE();
 }
 
 
-void HGraphBuilder::VisitExportDeclaration(ExportDeclaration* declaration) {
+void HOptimizedGraphBuilder::VisitExportDeclaration(
+    ExportDeclaration* declaration) {
   UNREACHABLE();
 }
 
 
-void HGraphBuilder::VisitModuleLiteral(ModuleLiteral* module) {
+void HOptimizedGraphBuilder::VisitModuleLiteral(ModuleLiteral* module) {
   UNREACHABLE();
 }
 
 
-void HGraphBuilder::VisitModuleVariable(ModuleVariable* module) {
+void HOptimizedGraphBuilder::VisitModuleVariable(ModuleVariable* module) {
   UNREACHABLE();
 }
 
 
-void HGraphBuilder::VisitModulePath(ModulePath* module) {
+void HOptimizedGraphBuilder::VisitModulePath(ModulePath* module) {
   UNREACHABLE();
 }
 
 
-void HGraphBuilder::VisitModuleUrl(ModuleUrl* module) {
+void HOptimizedGraphBuilder::VisitModuleUrl(ModuleUrl* module) {
   UNREACHABLE();
 }
 
 
-void HGraphBuilder::VisitModuleStatement(ModuleStatement* stmt) {
+void HOptimizedGraphBuilder::VisitModuleStatement(ModuleStatement* stmt) {
   UNREACHABLE();
 }
 
 
 // Generators for inline runtime functions.
 // Support for types.
-void HGraphBuilder::GenerateIsSmi(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateIsSmi(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 1);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* value = Pop();
   HIsSmiAndBranch* result = new(zone()) HIsSmiAndBranch(value);
   return ast_context()->ReturnControl(result, call->id());
 }
 
 
-void HGraphBuilder::GenerateIsSpecObject(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateIsSpecObject(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 1);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* value = Pop();
   HHasInstanceTypeAndBranch* result =
       new(zone()) HHasInstanceTypeAndBranch(value,
                                             FIRST_SPEC_OBJECT_TYPE,
                                             LAST_SPEC_OBJECT_TYPE);
   return ast_context()->ReturnControl(result, call->id());
 }
 
 
-void HGraphBuilder::GenerateIsFunction(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateIsFunction(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 1);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* value = Pop();
   HHasInstanceTypeAndBranch* result =
       new(zone()) HHasInstanceTypeAndBranch(value, JS_FUNCTION_TYPE);
   return ast_context()->ReturnControl(result, call->id());
 }
 
 
-void HGraphBuilder::GenerateHasCachedArrayIndex(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateHasCachedArrayIndex(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 1);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* value = Pop();
   HHasCachedArrayIndexAndBranch* result =
       new(zone()) HHasCachedArrayIndexAndBranch(value);
   return ast_context()->ReturnControl(result, call->id());
 }
 
 
-void HGraphBuilder::GenerateIsArray(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateIsArray(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 1);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* value = Pop();
   HHasInstanceTypeAndBranch* result =
       new(zone()) HHasInstanceTypeAndBranch(value, JS_ARRAY_TYPE);
   return ast_context()->ReturnControl(result, call->id());
 }
 
 
-void HGraphBuilder::GenerateIsRegExp(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateIsRegExp(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 1);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* value = Pop();
   HHasInstanceTypeAndBranch* result =
       new(zone()) HHasInstanceTypeAndBranch(value, JS_REGEXP_TYPE);
   return ast_context()->ReturnControl(result, call->id());
 }
 
 
-void HGraphBuilder::GenerateIsObject(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateIsObject(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 1);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* value = Pop();
   HIsObjectAndBranch* result = new(zone()) HIsObjectAndBranch(value);
   return ast_context()->ReturnControl(result, call->id());
 }
 
 
-void HGraphBuilder::GenerateIsNonNegativeSmi(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateIsNonNegativeSmi(CallRuntime* call) {
   return Bailout("inlined runtime function: IsNonNegativeSmi");
 }
 
 
-void HGraphBuilder::GenerateIsUndetectableObject(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateIsUndetectableObject(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 1);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* value = Pop();
   HIsUndetectableAndBranch* result =
       new(zone()) HIsUndetectableAndBranch(value);
   return ast_context()->ReturnControl(result, call->id());
 }
 
 
-void HGraphBuilder::GenerateIsStringWrapperSafeForDefaultValueOf(
+void HOptimizedGraphBuilder::GenerateIsStringWrapperSafeForDefaultValueOf(
     CallRuntime* call) {
   return Bailout(
       "inlined runtime function: IsStringWrapperSafeForDefaultValueOf");
 }
 
 
 // Support for construct call checks.
-void HGraphBuilder::GenerateIsConstructCall(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateIsConstructCall(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 0);
   if (function_state()->outer() != NULL) {
     // We are generating graph for inlined function.
     HValue* value = function_state()->inlining_kind() == CONSTRUCT_CALL_RETURN
         ? graph()->GetConstantTrue()
         : graph()->GetConstantFalse();
     return ast_context()->ReturnValue(value);
   } else {
     return ast_context()->ReturnControl(new(zone()) HIsConstructCallAndBranch,
                                         call->id());
   }
 }
 
 
 // Support for arguments.length and arguments[?].
-void HGraphBuilder::GenerateArgumentsLength(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateArgumentsLength(CallRuntime* call) {
   // Our implementation of arguments (based on this stack frame or an
   // adapter below it) does not work for inlined functions.  This runtime
   // function is blacklisted by AstNode::IsInlineable.
   ASSERT(function_state()->outer() == NULL);
   ASSERT(call->arguments()->length() == 0);
   HInstruction* elements = AddInstruction(
       new(zone()) HArgumentsElements(false));
   HArgumentsLength* result = new(zone()) HArgumentsLength(elements);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
-void HGraphBuilder::GenerateArguments(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateArguments(CallRuntime* call) {
   // Our implementation of arguments (based on this stack frame or an
   // adapter below it) does not work for inlined functions.  This runtime
   // function is blacklisted by AstNode::IsInlineable.
   ASSERT(function_state()->outer() == NULL);
   ASSERT(call->arguments()->length() == 1);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* index = Pop();
   HInstruction* elements = AddInstruction(
       new(zone()) HArgumentsElements(false));
   HInstruction* length = AddInstruction(new(zone()) HArgumentsLength(elements));
   HInstruction* checked_index =
       AddInstruction(new(zone()) HBoundsCheck(index, length));
   HAccessArgumentsAt* result =
       new(zone()) HAccessArgumentsAt(elements, length, checked_index);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
 // Support for accessing the class and value fields of an object.
-void HGraphBuilder::GenerateClassOf(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateClassOf(CallRuntime* call) {
   // The special form detected by IsClassOfTest is detected before we get here
   // and does not cause a bailout.
   return Bailout("inlined runtime function: ClassOf");
 }
 
 
-void HGraphBuilder::GenerateValueOf(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateValueOf(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 1);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* value = Pop();
   HValueOf* result = new(zone()) HValueOf(value);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
-void HGraphBuilder::GenerateDateField(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateDateField(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 2);
   ASSERT_NE(NULL, call->arguments()->at(1)->AsLiteral());
   Smi* index = Smi::cast(*(call->arguments()->at(1)->AsLiteral()->handle()));
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* date = Pop();
   HDateField* result = new(zone()) HDateField(date, index);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
-void HGraphBuilder::GenerateSetValueOf(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateSetValueOf(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 2);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   CHECK_ALIVE(VisitForValue(call->arguments()->at(1)));
   HValue* value = Pop();
   HValue* object = Pop();
   // Check if object is a not a smi.
   HIsSmiAndBranch* smicheck = new(zone()) HIsSmiAndBranch(object);
   HBasicBlock* if_smi = graph()->CreateBasicBlock();
   HBasicBlock* if_heap_object = graph()->CreateBasicBlock();
   HBasicBlock* join = graph()->CreateBasicBlock();
@@ skipping 22 matching lines @@
                                               true,  // in-object store.
                                               JSValue::kValueOffset));
   if_js_value->Goto(join);
   join->SetJoinId(call->id());
   set_current_block(join);
   return ast_context()->ReturnValue(value);
 }
 
 
 // Fast support for charCodeAt(n).
-void HGraphBuilder::GenerateStringCharCodeAt(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateStringCharCodeAt(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 2);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   CHECK_ALIVE(VisitForValue(call->arguments()->at(1)));
   HValue* index = Pop();
   HValue* string = Pop();
   HValue* context = environment()->LookupContext();
   HStringCharCodeAt* result = BuildStringCharCodeAt(context, string, index);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
 // Fast support for string.charAt(n) and string[n].
-void HGraphBuilder::GenerateStringCharFromCode(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateStringCharFromCode(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 1);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* char_code = Pop();
   HValue* context = environment()->LookupContext();
   HStringCharFromCode* result =
       new(zone()) HStringCharFromCode(context, char_code);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
 // Fast support for string.charAt(n) and string[n].
-void HGraphBuilder::GenerateStringCharAt(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateStringCharAt(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 2);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   CHECK_ALIVE(VisitForValue(call->arguments()->at(1)));
   HValue* index = Pop();
   HValue* string = Pop();
   HValue* context = environment()->LookupContext();
   HStringCharCodeAt* char_code = BuildStringCharCodeAt(context, string, index);
   AddInstruction(char_code);
   HStringCharFromCode* result =
       new(zone()) HStringCharFromCode(context, char_code);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
 // Fast support for object equality testing.
-void HGraphBuilder::GenerateObjectEquals(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateObjectEquals(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 2);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   CHECK_ALIVE(VisitForValue(call->arguments()->at(1)));
   HValue* right = Pop();
   HValue* left = Pop();
   HCompareObjectEqAndBranch* result =
       new(zone()) HCompareObjectEqAndBranch(left, right);
   return ast_context()->ReturnControl(result, call->id());
 }
 
 
-void HGraphBuilder::GenerateLog(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateLog(CallRuntime* call) {
   // %_Log is ignored in optimized code.
   return ast_context()->ReturnValue(graph()->GetConstantUndefined());
 }
 
 
 // Fast support for Math.random().
-void HGraphBuilder::GenerateRandomHeapNumber(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateRandomHeapNumber(CallRuntime* call) {
   HValue* context = environment()->LookupContext();
   HGlobalObject* global_object = new(zone()) HGlobalObject(context);
   AddInstruction(global_object);
   HRandom* result = new(zone()) HRandom(global_object);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
 // Fast support for StringAdd.
-void HGraphBuilder::GenerateStringAdd(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateStringAdd(CallRuntime* call) {
   ASSERT_EQ(2, call->arguments()->length());
   CHECK_ALIVE(VisitArgumentList(call->arguments()));
   HValue* context = environment()->LookupContext();
   HCallStub* result = new(zone()) HCallStub(context, CodeStub::StringAdd, 2);
   Drop(2);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
 // Fast support for SubString.
-void HGraphBuilder::GenerateSubString(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateSubString(CallRuntime* call) {
   ASSERT_EQ(3, call->arguments()->length());
   CHECK_ALIVE(VisitArgumentList(call->arguments()));
   HValue* context = environment()->LookupContext();
   HCallStub* result = new(zone()) HCallStub(context, CodeStub::SubString, 3);
   Drop(3);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
 // Fast support for StringCompare.
-void HGraphBuilder::GenerateStringCompare(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateStringCompare(CallRuntime* call) {
   ASSERT_EQ(2, call->arguments()->length());
   CHECK_ALIVE(VisitArgumentList(call->arguments()));
   HValue* context = environment()->LookupContext();
   HCallStub* result =
       new(zone()) HCallStub(context, CodeStub::StringCompare, 2);
   Drop(2);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
 // Support for direct calls from JavaScript to native RegExp code.
-void HGraphBuilder::GenerateRegExpExec(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateRegExpExec(CallRuntime* call) {
   ASSERT_EQ(4, call->arguments()->length());
   CHECK_ALIVE(VisitArgumentList(call->arguments()));
   HValue* context = environment()->LookupContext();
   HCallStub* result = new(zone()) HCallStub(context, CodeStub::RegExpExec, 4);
   Drop(4);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
 // Construct a RegExp exec result with two in-object properties.
-void HGraphBuilder::GenerateRegExpConstructResult(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateRegExpConstructResult(CallRuntime* call) {
   ASSERT_EQ(3, call->arguments()->length());
   CHECK_ALIVE(VisitArgumentList(call->arguments()));
   HValue* context = environment()->LookupContext();
   HCallStub* result =
       new(zone()) HCallStub(context, CodeStub::RegExpConstructResult, 3);
   Drop(3);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
 // Support for fast native caches.
-void HGraphBuilder::GenerateGetFromCache(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateGetFromCache(CallRuntime* call) {
   return Bailout("inlined runtime function: GetFromCache");
 }
 
 
 // Fast support for number to string.
-void HGraphBuilder::GenerateNumberToString(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateNumberToString(CallRuntime* call) {
   ASSERT_EQ(1, call->arguments()->length());
   CHECK_ALIVE(VisitArgumentList(call->arguments()));
   HValue* context = environment()->LookupContext();
   HCallStub* result =
       new(zone()) HCallStub(context, CodeStub::NumberToString, 1);
   Drop(1);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
 // Fast call for custom callbacks.
-void HGraphBuilder::GenerateCallFunction(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateCallFunction(CallRuntime* call) {
   // 1 ~ The function to call is not itself an argument to the call.
   int arg_count = call->arguments()->length() - 1;
   ASSERT(arg_count >= 1);  // There's always at least a receiver.
 
   for (int i = 0; i < arg_count; ++i) {
     CHECK_ALIVE(VisitArgument(call->arguments()->at(i)));
   }
   CHECK_ALIVE(VisitForValue(call->arguments()->last()));
 
   HValue* function = Pop();
@@ skipping 23 matching lines @@
   Push(call_result);
   if_nonfunction->Goto(join);
 
   set_current_block(join);
   join->SetJoinId(call->id());
   return ast_context()->ReturnValue(Pop());
 }
 
 
 // Fast call to math functions.
-void HGraphBuilder::GenerateMathPow(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateMathPow(CallRuntime* call) {
   ASSERT_EQ(2, call->arguments()->length());
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   CHECK_ALIVE(VisitForValue(call->arguments()->at(1)));
   HValue* right = Pop();
   HValue* left = Pop();
   HPower* result = new(zone()) HPower(left, right);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
-void HGraphBuilder::GenerateMathSin(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateMathSin(CallRuntime* call) {
   ASSERT_EQ(1, call->arguments()->length());
   CHECK_ALIVE(VisitArgumentList(call->arguments()));
   HValue* context = environment()->LookupContext();
   HCallStub* result =
       new(zone()) HCallStub(context, CodeStub::TranscendentalCache, 1);
   result->set_transcendental_type(TranscendentalCache::SIN);
   Drop(1);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
-void HGraphBuilder::GenerateMathCos(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateMathCos(CallRuntime* call) {
   ASSERT_EQ(1, call->arguments()->length());
   CHECK_ALIVE(VisitArgumentList(call->arguments()));
   HValue* context = environment()->LookupContext();
   HCallStub* result =
       new(zone()) HCallStub(context, CodeStub::TranscendentalCache, 1);
   result->set_transcendental_type(TranscendentalCache::COS);
   Drop(1);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
-void HGraphBuilder::GenerateMathTan(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateMathTan(CallRuntime* call) {
   ASSERT_EQ(1, call->arguments()->length());
   CHECK_ALIVE(VisitArgumentList(call->arguments()));
   HValue* context = environment()->LookupContext();
   HCallStub* result =
       new(zone()) HCallStub(context, CodeStub::TranscendentalCache, 1);
   result->set_transcendental_type(TranscendentalCache::TAN);
   Drop(1);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
-void HGraphBuilder::GenerateMathLog(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateMathLog(CallRuntime* call) {
   ASSERT_EQ(1, call->arguments()->length());
   CHECK_ALIVE(VisitArgumentList(call->arguments()));
   HValue* context = environment()->LookupContext();
   HCallStub* result =
       new(zone()) HCallStub(context, CodeStub::TranscendentalCache, 1);
   result->set_transcendental_type(TranscendentalCache::LOG);
   Drop(1);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
-void HGraphBuilder::GenerateMathSqrt(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateMathSqrt(CallRuntime* call) {
   return Bailout("inlined runtime function: MathSqrt");
 }
 
 
 // Check whether two RegExps are equivalent
-void HGraphBuilder::GenerateIsRegExpEquivalent(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateIsRegExpEquivalent(CallRuntime* call) {
   return Bailout("inlined runtime function: IsRegExpEquivalent");
 }
 
 
-void HGraphBuilder::GenerateGetCachedArrayIndex(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateGetCachedArrayIndex(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 1);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* value = Pop();
   HGetCachedArrayIndex* result = new(zone()) HGetCachedArrayIndex(value);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
-void HGraphBuilder::GenerateFastAsciiArrayJoin(CallRuntime* call) {
+void HOptimizedGraphBuilder::GenerateFastAsciiArrayJoin(CallRuntime* call) {
   return Bailout("inlined runtime function: FastAsciiArrayJoin");
 }
 
 
 #undef CHECK_BAILOUT
 #undef CHECK_ALIVE
 
 
 HEnvironment::HEnvironment(HEnvironment* outer,
                            Scope* scope,
                            Handle<JSFunction> closure,
                            Zone* zone)
     : closure_(closure),
       values_(0, zone),
       assigned_variables_(4, zone),
       frame_type_(JS_FUNCTION),
       parameter_count_(0),
       specials_count_(1),
       local_count_(0),
       outer_(outer),
       entry_(NULL),
       pop_count_(0),
       push_count_(0),
       ast_id_(BailoutId::None()),
       zone_(zone) {
   Initialize(scope->num_parameters() + 1, scope->num_stack_slots(), 0);
 }
 
 
+HEnvironment::HEnvironment(Zone* zone)
+    : values_(0, zone),
+      assigned_variables_(0, zone),
+      frame_type_(STUB),
+      parameter_count_(0),
+      specials_count_(0),
+      local_count_(0),
+      outer_(NULL),
+      entry_(NULL),
+      pop_count_(0),
+      push_count_(0),
+      ast_id_(BailoutId::None()),
+      zone_(zone) {
+  Initialize(0, 0, 0);
+}
+
+
 HEnvironment::HEnvironment(const HEnvironment* other, Zone* zone)
     : values_(0, zone),
       assigned_variables_(0, zone),
       frame_type_(JS_FUNCTION),
       parameter_count_(0),
       specials_count_(1),
       local_count_(0),
       outer_(NULL),
       entry_(NULL),
       pop_count_(0),
@@ skipping 247 matching lines @@
 
 
 void HEnvironment::PrintToStd() {
   HeapStringAllocator string_allocator;
   StringStream trace(&string_allocator);
   PrintTo(&trace);
   PrintF("%s", *trace.ToCString());
 }
 
 
-void HTracer::TraceCompilation(FunctionLiteral* function) {
+void HTracer::TraceCompilation(CompilationInfo* info) {
   Tag tag(this, "compilation");
-  Handle<String> name = function->debug_name();
-  PrintStringProperty("name", *name->ToCString());
-  PrintStringProperty("method", *name->ToCString());
+  if (info->IsOptimizing()) {
+    Handle<String> name = info->function()->debug_name();
+    PrintStringProperty("name", *name->ToCString());
+    PrintStringProperty("method", *name->ToCString());
+  } else {
+    CodeStub::Major major_key = info->code_stub()->MajorKey();
+    PrintStringProperty("name", CodeStub::MajorName(major_key, false));
+    PrintStringProperty("method", "stub");
+  }
   PrintLongProperty("date", static_cast<int64_t>(OS::TimeCurrentMillis()));
 }
 
 
 void HTracer::TraceLithium(const char* name, LChunk* chunk) {
   Trace(name, chunk->graph(), chunk);
 }
 
 
 void HTracer::TraceHydrogen(const char* name, HGraph* graph) {
@@ skipping 308 matching lines @@
     }
   }
 
 #ifdef DEBUG
   if (graph_ != NULL) graph_->Verify(false);  // No full verify.
   if (allocator_ != NULL) allocator_->Verify();
 #endif
 }
 
 } }  // namespace v8::internal