Version 3.2.6

src/mips/codegen-mips.cc

Index: src/mips/codegen-mips.cc
diff --git a/src/mips/codegen-mips.cc b/src/mips/codegen-mips.cc
index b5226163f179e043691c6d3201fbe3bad477e82e..c1149dfd1dc32ebd760719b660ddbe396b1c2889 100644
--- a/src/mips/codegen-mips.cc
+++ b/src/mips/codegen-mips.cc
@@ -31,36 +31,62 @@
 #if defined(V8_TARGET_ARCH_MIPS)
 
 #include "bootstrapper.h"
+#include "code-stubs.h"
 #include "codegen-inl.h"
 #include "compiler.h"
 #include "debug.h"
 #include "ic-inl.h"
+#include "jsregexp.h"
+#include "jump-target-inl.h"
 #include "parser.h"
+#include "regexp-macro-assembler.h"
+#include "regexp-stack.h"
 #include "register-allocator-inl.h"
 #include "runtime.h"
 #include "scopes.h"
+#include "stub-cache.h"
 #include "virtual-frame-inl.h"
-
-
+#include "virtual-frame-mips-inl.h"
 
 namespace v8 {
 namespace internal {
 
-#define __ ACCESS_MASM(masm_)
-
 
+#define __ ACCESS_MASM(masm_)
 
-// -----------------------------------------------------------------------------
+// -------------------------------------------------------------------------
 // Platform-specific DeferredCode functions.
 
-
 void DeferredCode::SaveRegisters() {
-  UNIMPLEMENTED_MIPS();
+  // On MIPS you either have a completely spilled frame or you
+  // handle it yourself, but at the moment there's no automation
+  // of registers and deferred code.
 }
 
 
 void DeferredCode::RestoreRegisters() {
-  UNIMPLEMENTED_MIPS();
+}
+
+
+// -------------------------------------------------------------------------
+// Platform-specific RuntimeCallHelper functions.
+
+void VirtualFrameRuntimeCallHelper::BeforeCall(MacroAssembler* masm) const {
+  frame_state_->frame()->AssertIsSpilled();
+}
+
+
+void VirtualFrameRuntimeCallHelper::AfterCall(MacroAssembler* masm) const {
+}
+
+
+void StubRuntimeCallHelper::BeforeCall(MacroAssembler* masm) const {
+  masm->EnterInternalFrame();
+}
+
+
+void StubRuntimeCallHelper::AfterCall(MacroAssembler* masm) const {
+  masm->LeaveInternalFrame();
 }
 
 
@@ -69,21 +95,28 @@ void DeferredCode::RestoreRegisters() {
 
 CodeGenState::CodeGenState(CodeGenerator* owner)
     : owner_(owner),
-      true_target_(NULL),
-      false_target_(NULL),
-      previous_(NULL) {
-  owner_->set_state(this);
+      previous_(owner->state()) {
+  owner->set_state(this);
 }
 
 
-CodeGenState::CodeGenState(CodeGenerator* owner,
+ConditionCodeGenState::ConditionCodeGenState(CodeGenerator* owner,
                            JumpTarget* true_target,
                            JumpTarget* false_target)
-    : owner_(owner),
+    : CodeGenState(owner),
       true_target_(true_target),
-      false_target_(false_target),
-      previous_(owner->state()) {
-  owner_->set_state(this);
+      false_target_(false_target) {
+  owner->set_state(this);
+}
+
+
+TypeInfoCodeGenState::TypeInfoCodeGenState(CodeGenerator* owner,
+                                           Slot* slot,
+                                           TypeInfo type_info)
+    : CodeGenState(owner),
+      slot_(slot) {
+  owner->set_state(this);
+  old_type_info_ = owner->set_type_info(slot, type_info);
 }
 
 
@@ -93,16 +126,25 @@ CodeGenState::~CodeGenState() {
 }
 
 
+TypeInfoCodeGenState::~TypeInfoCodeGenState() {
+  owner()->set_type_info(slot_, old_type_info_);
+}
+
+
 // -----------------------------------------------------------------------------
-// CodeGenerator implementation
+// CodeGenerator implementation.
 
 CodeGenerator::CodeGenerator(MacroAssembler* masm)
     : deferred_(8),
       masm_(masm),
+      info_(NULL),
       frame_(NULL),
       allocator_(NULL),
       cc_reg_(cc_always),
       state_(NULL),
+      loop_nesting_(0),
+      type_info_(NULL),
+      function_return_(JumpTarget::BIDIRECTIONAL),
       function_return_is_shadowed_(false) {
 }
 
@@ -114,356 +156,249 @@ CodeGenerator::CodeGenerator(MacroAssembler* masm)
 // cp: callee's context
 
 void CodeGenerator::Generate(CompilationInfo* info) {
-  // Record the position for debugging purposes.
-  CodeForFunctionPosition(info->function());
-
-  // Initialize state.
-  info_ = info;
-  ASSERT(allocator_ == NULL);
-  RegisterAllocator register_allocator(this);
-  allocator_ = &register_allocator;
-  ASSERT(frame_ == NULL);
-  frame_ = new VirtualFrame();
-  cc_reg_ = cc_always;
-
-  {
-    CodeGenState state(this);
-
-    // Registers:
-    // a1: called JS function
-    // ra: return address
-    // fp: caller's frame pointer
-    // sp: stack pointer
-    // cp: callee's context
-    //
-    // Stack:
-    // arguments
-    // receiver
-
-    frame_->Enter();
-
-    // Allocate space for locals and initialize them.
-    frame_->AllocateStackSlots();
-
-    // Initialize the function return target.
-    function_return_.set_direction(JumpTarget::BIDIRECTIONAL);
-    function_return_is_shadowed_ = false;
-
-    VirtualFrame::SpilledScope spilled_scope;
-    if (scope()->num_heap_slots() > 0) {
-      UNIMPLEMENTED_MIPS();
-    }
-
-    {
-      Comment cmnt2(masm_, "[ copy context parameters into .context");
-
-      // Note that iteration order is relevant here! If we have the same
-      // parameter twice (e.g., function (x, y, x)), and that parameter
-      // needs to be copied into the context, it must be the last argument
-      // passed to the parameter that needs to be copied. This is a rare
-      // case so we don't check for it, instead we rely on the copying
-      // order: such a parameter is copied repeatedly into the same
-      // context location and thus the last value is what is seen inside
-      // the function.
-      for (int i = 0; i < scope()->num_parameters(); i++) {
-        UNIMPLEMENTED_MIPS();
-      }
-    }
-
-    // Store the arguments object.  This must happen after context
-    // initialization because the arguments object may be stored in the
-    // context.
-    if (scope()->arguments() != NULL) {
-      UNIMPLEMENTED_MIPS();
-    }
-
-    // Generate code to 'execute' declarations and initialize functions
-    // (source elements). In case of an illegal redeclaration we need to
-    // handle that instead of processing the declarations.
-    if (scope()->HasIllegalRedeclaration()) {
-      Comment cmnt(masm_, "[ illegal redeclarations");
-      scope()->VisitIllegalRedeclaration(this);
-    } else {
-      Comment cmnt(masm_, "[ declarations");
-      ProcessDeclarations(scope()->declarations());
-      // Bail out if a stack-overflow exception occurred when processing
-      // declarations.
-      if (HasStackOverflow()) return;
-    }
-
-    if (FLAG_trace) {
-      UNIMPLEMENTED_MIPS();
-    }
-
-    // Compile the body of the function in a vanilla state. Don't
-    // bother compiling all the code if the scope has an illegal
-    // redeclaration.
-    if (!scope()->HasIllegalRedeclaration()) {
-      Comment cmnt(masm_, "[ function body");
-#ifdef DEBUG
-      bool is_builtin = Isolate::Current()->bootstrapper()->IsActive();
-      bool should_trace =
-          is_builtin ? FLAG_trace_builtin_calls : FLAG_trace_calls;
-      if (should_trace) {
-        UNIMPLEMENTED_MIPS();
-      }
-#endif
-      VisitStatementsAndSpill(info->function()->body());
-    }
-  }
+  UNIMPLEMENTED_MIPS();
+}
 
-  if (has_valid_frame() || function_return_.is_linked()) {
-    if (!function_return_.is_linked()) {
-      CodeForReturnPosition(info->function());
-    }
-    // Registers:
-    // v0: result
-    // sp: stack pointer
-    // fp: frame pointer
-    // cp: callee's context
-
-    __ LoadRoot(v0, Heap::kUndefinedValueRootIndex);
-
-    function_return_.Bind();
-    if (FLAG_trace) {
-      UNIMPLEMENTED_MIPS();
-    }
-
-    // Add a label for checking the size of the code used for returning.
-    Label check_exit_codesize;
-    masm_->bind(&check_exit_codesize);
-
-    masm_->mov(sp, fp);
-    masm_->lw(fp, MemOperand(sp, 0));
-    masm_->lw(ra, MemOperand(sp, 4));
-    masm_->addiu(sp, sp, 8);
-
-    // Here we use masm_-> instead of the __ macro to avoid the code coverage
-    // tool from instrumenting as we rely on the code size here.
-    // TODO(MIPS): Should we be able to use more than 0x1ffe parameters?
-    masm_->addiu(sp, sp, (scope()->num_parameters() + 1) * kPointerSize);
-    masm_->Jump(ra);
-    // The Jump automatically generates a nop in the branch delay slot.
-
-    // Check that the size of the code used for returning matches what is
-    // expected by the debugger.
-    ASSERT_EQ(kJSReturnSequenceLength,
-              masm_->InstructionsGeneratedSince(&check_exit_codesize));
-  }
 
-  // Code generation state must be reset.
-  ASSERT(!has_cc());
-  ASSERT(state_ == NULL);
-  ASSERT(!function_return_is_shadowed_);
-  function_return_.Unuse();
-  DeleteFrame();
+int CodeGenerator::NumberOfSlot(Slot* slot) {
+  UNIMPLEMENTED_MIPS();
+  return 0;
+}
 
-  // Process any deferred code using the register allocator.
-  if (!HasStackOverflow()) {
-    ProcessDeferred();
-  }
 
-  allocator_ = NULL;
+MemOperand CodeGenerator::SlotOperand(Slot* slot, Register tmp) {
+  UNIMPLEMENTED_MIPS();
+  return MemOperand(zero_reg, 0);
 }
 
 
-void CodeGenerator::LoadReference(Reference* ref) {
-  VirtualFrame::SpilledScope spilled_scope;
-  Comment cmnt(masm_, "[ LoadReference");
-  Expression* e = ref->expression();
-  Property* property = e->AsProperty();
-  Variable* var = e->AsVariableProxy()->AsVariable();
+MemOperand CodeGenerator::ContextSlotOperandCheckExtensions(
+    Slot* slot,
+    Register tmp,
+    Register tmp2,
+    JumpTarget* slow) {
+  UNIMPLEMENTED_MIPS();
+  return MemOperand(zero_reg, 0);
+}
 
-  if (property != NULL) {
-    UNIMPLEMENTED_MIPS();
-  } else if (var != NULL) {
-    // The expression is a variable proxy that does not rewrite to a
-    // property.  Global variables are treated as named property references.
-    if (var->is_global()) {
-      LoadGlobal();
-      ref->set_type(Reference::NAMED);
-    } else {
-      ASSERT(var->slot() != NULL);
-      ref->set_type(Reference::SLOT);
-    }
-  } else {
-    UNIMPLEMENTED_MIPS();
-  }
+
+void CodeGenerator::LoadCondition(Expression* x,
+                                  JumpTarget* true_target,
+                                  JumpTarget* false_target,
+                                  bool force_cc) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void CodeGenerator::Load(Expression* x) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void CodeGenerator::LoadGlobal() {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void CodeGenerator::LoadGlobalReceiver(Register scratch) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+ArgumentsAllocationMode CodeGenerator::ArgumentsMode() {
+  UNIMPLEMENTED_MIPS();
+  return EAGER_ARGUMENTS_ALLOCATION;
+}
+
+
+void CodeGenerator::StoreArgumentsObject(bool initial) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void CodeGenerator::LoadTypeofExpression(Expression* x) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+Reference::Reference(CodeGenerator* cgen,
+                     Expression* expression,
+                     bool persist_after_get)
+    : cgen_(cgen),
+      expression_(expression),
+      type_(ILLEGAL),
+      persist_after_get_(persist_after_get) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+Reference::~Reference() {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void CodeGenerator::LoadReference(Reference* ref) {
+  UNIMPLEMENTED_MIPS();
 }
 
 
 void CodeGenerator::UnloadReference(Reference* ref) {
-  VirtualFrame::SpilledScope spilled_scope;
-  // Pop a reference from the stack while preserving TOS.
-  Comment cmnt(masm_, "[ UnloadReference");
-  int size = ref->size();
-  if (size > 0) {
-    frame_->EmitPop(a0);
-    frame_->Drop(size);
-    frame_->EmitPush(a0);
-  }
-  ref->set_unloaded();
+  UNIMPLEMENTED_MIPS();
 }
 
 
-MemOperand CodeGenerator::SlotOperand(Slot* slot, Register tmp) {
-  // Currently, this assertion will fail if we try to assign to
-  // a constant variable that is constant because it is read-only
-  // (such as the variable referring to a named function expression).
-  // We need to implement assignments to read-only variables.
-  // Ideally, we should do this during AST generation (by converting
-  // such assignments into expression statements); however, in general
-  // we may not be able to make the decision until past AST generation,
-  // that is when the entire program is known.
-  ASSERT(slot != NULL);
-  int index = slot->index();
-  switch (slot->type()) {
-    case Slot::PARAMETER:
-      UNIMPLEMENTED_MIPS();
-      return MemOperand(no_reg, 0);
-
-    case Slot::LOCAL:
-      return frame_->LocalAt(index);
-
-    case Slot::CONTEXT: {
-      UNIMPLEMENTED_MIPS();
-      return MemOperand(no_reg, 0);
-    }
-
-    default:
-      UNREACHABLE();
-      return MemOperand(no_reg, 0);
-  }
+// ECMA-262, section 9.2, page 30: ToBoolean(). Convert the given
+// register to a boolean in the condition code register. The code
+// may jump to 'false_target' in case the register converts to 'false'.
+void CodeGenerator::ToBoolean(JumpTarget* true_target,
+                              JumpTarget* false_target) {
+  UNIMPLEMENTED_MIPS();
 }
 
 
-// Loads a value on TOS. If it is a boolean value, the result may have been
-// (partially) translated into branches, or it may have set the condition
-// code register. If force_cc is set, the value is forced to set the
-// condition code register and no value is pushed. If the condition code
-// register was set, has_cc() is true and cc_reg_ contains the condition to
-// test for 'true'.
-void CodeGenerator::LoadCondition(Expression* x,
-                                  JumpTarget* true_target,
-                                  JumpTarget* false_target,
-                                  bool force_cc) {
-  ASSERT(!has_cc());
-  int original_height = frame_->height();
-
-  { CodeGenState new_state(this, true_target, false_target);
-    Visit(x);
-
-    // If we hit a stack overflow, we may not have actually visited
-    // the expression. In that case, we ensure that we have a
-    // valid-looking frame state because we will continue to generate
-    // code as we unwind the C++ stack.
-    //
-    // It's possible to have both a stack overflow and a valid frame
-    // state (eg, a subexpression overflowed, visiting it returned
-    // with a dummied frame state, and visiting this expression
-    // returned with a normal-looking state).
-    if (HasStackOverflow() &&
-        has_valid_frame() &&
-        !has_cc() &&
-        frame_->height() == original_height) {
-      true_target->Jump();
-    }
-  }
-  if (force_cc && frame_ != NULL && !has_cc()) {
-    // Convert the TOS value to a boolean in the condition code register.
-    UNIMPLEMENTED_MIPS();
+void CodeGenerator::GenericBinaryOperation(Token::Value op,
+                                           OverwriteMode overwrite_mode,
+                                           GenerateInlineSmi inline_smi,
+                                           int constant_rhs) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+class DeferredInlineSmiOperation: public DeferredCode {
+ public:
+  DeferredInlineSmiOperation(Token::Value op,
+                             int value,
+                             bool reversed,
+                             OverwriteMode overwrite_mode,
+                             Register tos)
+      : op_(op),
+        value_(value),
+        reversed_(reversed),
+        overwrite_mode_(overwrite_mode),
+        tos_register_(tos) {
+    set_comment("[ DeferredInlinedSmiOperation");
   }
-  ASSERT(!force_cc || !has_valid_frame() || has_cc());
-  ASSERT(!has_valid_frame() ||
-         (has_cc() && frame_->height() == original_height) ||
-         (!has_cc() && frame_->height() == original_height + 1));
+
+  virtual void Generate();
+  // This stub makes explicit calls to SaveRegisters(), RestoreRegisters() and
+  // Exit(). Currently on MIPS SaveRegisters() and RestoreRegisters() are empty
+  // methods, it is the responsibility of the deferred code to save and restore
+  // registers.
+  virtual bool AutoSaveAndRestore() { return false; }
+
+  void JumpToNonSmiInput(Condition cond, Register cmp1, const Operand& cmp2);
+  void JumpToAnswerOutOfRange(Condition cond,
+                              Register cmp1,
+                              const Operand& cmp2);
+
+ private:
+  void GenerateNonSmiInput();
+  void GenerateAnswerOutOfRange();
+  void WriteNonSmiAnswer(Register answer,
+                         Register heap_number,
+                         Register scratch);
+
+  Token::Value op_;
+  int value_;
+  bool reversed_;
+  OverwriteMode overwrite_mode_;
+  Register tos_register_;
+  Label non_smi_input_;
+  Label answer_out_of_range_;
+};
+
+
+// For bit operations we try harder and handle the case where the input is not
+// a Smi but a 32bits integer without calling the generic stub.
+void DeferredInlineSmiOperation::JumpToNonSmiInput(Condition cond,
+                                                   Register cmp1,
+                                                   const Operand& cmp2) {
+  UNIMPLEMENTED_MIPS();
 }
 
 
-void CodeGenerator::Load(Expression* x) {
-#ifdef DEBUG
-  int original_height = frame_->height();
-#endif
-  JumpTarget true_target;
-  JumpTarget false_target;
-  LoadCondition(x, &true_target, &false_target, false);
+// For bit operations the result is always 32bits so we handle the case where
+// the result does not fit in a Smi without calling the generic stub.
+void DeferredInlineSmiOperation::JumpToAnswerOutOfRange(Condition cond,
+                                                        Register cmp1,
+                                                        const Operand& cmp2) {
+  UNIMPLEMENTED_MIPS();
+}
 
-  if (has_cc()) {
-    UNIMPLEMENTED_MIPS();
-  }
 
-  if (true_target.is_linked() || false_target.is_linked()) {
-    UNIMPLEMENTED_MIPS();
-  }
-  ASSERT(has_valid_frame());
-  ASSERT(!has_cc());
-  ASSERT(frame_->height() == original_height + 1);
+// On entry the non-constant side of the binary operation is in tos_register_
+// and the constant smi side is nowhere.  The tos_register_ is not used by the
+// virtual frame.  On exit the answer is in the tos_register_ and the virtual
+// frame is unchanged.
+void DeferredInlineSmiOperation::Generate() {
+  UNIMPLEMENTED_MIPS();
 }
 
 
-void CodeGenerator::LoadGlobal() {
-  VirtualFrame::SpilledScope spilled_scope;
-  __ lw(a0, GlobalObject());
-  frame_->EmitPush(a0);
+// Convert and write the integer answer into heap_number.
+void DeferredInlineSmiOperation::WriteNonSmiAnswer(Register answer,
+                                                   Register heap_number,
+                                                   Register scratch) {
+  UNIMPLEMENTED_MIPS();
 }
 
 
-void CodeGenerator::LoadFromSlot(Slot* slot, TypeofState typeof_state) {
-  VirtualFrame::SpilledScope spilled_scope;
-  if (slot->type() == Slot::LOOKUP) {
-    UNIMPLEMENTED_MIPS();
-  } else {
-    __ lw(a0, SlotOperand(slot, a2));
-    frame_->EmitPush(a0);
-    if (slot->var()->mode() == Variable::CONST) {
-      UNIMPLEMENTED_MIPS();
-    }
-  }
+void DeferredInlineSmiOperation::GenerateNonSmiInput() {
+  UNIMPLEMENTED_MIPS();
 }
 
 
-void CodeGenerator::StoreToSlot(Slot* slot, InitState init_state) {
-  ASSERT(slot != NULL);
-  if (slot->type() == Slot::LOOKUP) {
-      UNIMPLEMENTED_MIPS();
-  } else {
-    ASSERT(!slot->var()->is_dynamic());
-
-    JumpTarget exit;
-    if (init_state == CONST_INIT) {
-      UNIMPLEMENTED_MIPS();
-    }
-
-    // We must execute the store. Storing a variable must keep the
-    // (new) value on the stack. This is necessary for compiling
-    // assignment expressions.
-    //
-    // Note: We will reach here even with slot->var()->mode() ==
-    // Variable::CONST because of const declarations which will
-    // initialize consts to 'the hole' value and by doing so, end up
-    // calling this code. a2 may be loaded with context; used below in
-    // RecordWrite.
-    frame_->EmitPop(a0);
-    __ sw(a0, SlotOperand(slot, a2));
-    frame_->EmitPush(a0);
-    if (slot->type() == Slot::CONTEXT) {
-      UNIMPLEMENTED_MIPS();
-    }
-    // If we definitely did not jump over the assignment, we do not need
-    // to bind the exit label. Doing so can defeat peephole
-    // optimization.
-    if (init_state == CONST_INIT || slot->type() == Slot::CONTEXT) {
-      exit.Bind();
-    }
-  }
+void DeferredInlineSmiOperation::GenerateAnswerOutOfRange() {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void CodeGenerator::SmiOperation(Token::Value op,
+                                 Handle<Object> value,
+                                 bool reversed,
+                                 OverwriteMode mode) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+// On MIPS we load registers condReg1 and condReg2 with the values which should
+// be compared. With the CodeGenerator::cc_reg_ condition, functions will be
+// able to evaluate correctly the condition. (eg CodeGenerator::Branch)
+void CodeGenerator::Comparison(Condition cc,
+                               Expression* left,
+                               Expression* right,
+                               bool strict) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void CodeGenerator::CallWithArguments(ZoneList<Expression*>* args,
+                                      CallFunctionFlags flags,
+                                      int position) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void CodeGenerator::CallApplyLazy(Expression* applicand,
+                                  Expression* receiver,
+                                  VariableProxy* arguments,
+                                  int position) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void CodeGenerator::Branch(bool if_true, JumpTarget* target) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void CodeGenerator::CheckStack() {
+  UNIMPLEMENTED_MIPS();
 }
 
 
 void CodeGenerator::VisitStatements(ZoneList<Statement*>* statements) {
-  VirtualFrame::SpilledScope spilled_scope;
-  for (int i = 0; frame_ != NULL && i < statements->length(); i++) {
-    VisitAndSpill(statements->at(i));
-  }
+  UNIMPLEMENTED_MIPS();
 }
 
 
@@ -473,14 +408,7 @@ void CodeGenerator::VisitBlock(Block* node) {
 
 
 void CodeGenerator::DeclareGlobals(Handle<FixedArray> pairs) {
-  VirtualFrame::SpilledScope spilled_scope;
-  frame_->EmitPush(cp);
-  __ li(t0, Operand(pairs));
-  frame_->EmitPush(t0);
-  __ li(t0, Operand(Smi::FromInt(is_eval() ? 1 : 0)));
-  frame_->EmitPush(t0);
-  frame_->CallRuntime(Runtime::kDeclareGlobals, 3);
-  // The result is discarded.
+  UNIMPLEMENTED_MIPS();
 }
 
 
@@ -490,17 +418,7 @@ void CodeGenerator::VisitDeclaration(Declaration* node) {
 
 
 void CodeGenerator::VisitExpressionStatement(ExpressionStatement* node) {
-#ifdef DEBUG
-  int original_height = frame_->height();
-#endif
-  VirtualFrame::SpilledScope spilled_scope;
-  Comment cmnt(masm_, "[ ExpressionStatement");
-  CodeForStatementPosition(node);
-  Expression* expression = node->expression();
-  expression->MarkAsStatement();
-  LoadAndSpill(expression);
-  frame_->Drop();
-  ASSERT(frame_->height() == original_height);
+  UNIMPLEMENTED_MIPS();
 }
 
 
@@ -525,22 +443,12 @@ void CodeGenerator::VisitBreakStatement(BreakStatement* node) {
 
 
 void CodeGenerator::VisitReturnStatement(ReturnStatement* node) {
-  VirtualFrame::SpilledScope spilled_scope;
-  Comment cmnt(masm_, "[ ReturnStatement");
-
-  CodeForStatementPosition(node);
-  LoadAndSpill(node->expression());
-  if (function_return_is_shadowed_) {
-    frame_->EmitPop(v0);
-    function_return_.Jump();
-  } else {
-    // Pop the result from the frame and prepare the frame for
-    // returning thus making it easier to merge.
-    frame_->EmitPop(v0);
-    frame_->PrepareForReturn();
-
-    function_return_.Jump();
-  }
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void CodeGenerator::GenerateReturnSequence() {
+  UNIMPLEMENTED_MIPS();
 }
 
 
@@ -594,6 +502,13 @@ void CodeGenerator::VisitDebuggerStatement(DebuggerStatement* node) {
 }
 
 
+void CodeGenerator::InstantiateFunction(
+    Handle<SharedFunctionInfo> function_info,
+    bool pretenure) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
 void CodeGenerator::VisitFunctionLiteral(FunctionLiteral* node) {
   UNIMPLEMENTED_MIPS();
 }
@@ -610,46 +525,49 @@ void CodeGenerator::VisitConditional(Conditional* node) {
 }
 
 
+void CodeGenerator::LoadFromSlot(Slot* slot, TypeofState typeof_state) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void CodeGenerator::LoadFromSlotCheckForArguments(Slot* slot,
+                                                  TypeofState state) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void CodeGenerator::StoreToSlot(Slot* slot, InitState init_state) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void CodeGenerator::LoadFromGlobalSlotCheckExtensions(Slot* slot,
+                                                      TypeofState typeof_state,
+                                                      JumpTarget* slow) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void CodeGenerator::EmitDynamicLoadFromSlotFastCase(Slot* slot,
+                                                    TypeofState typeof_state,
+                                                    JumpTarget* slow,
+                                                    JumpTarget* done) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
 void CodeGenerator::VisitSlot(Slot* node) {
-#ifdef DEBUG
-  int original_height = frame_->height();
-#endif
-  VirtualFrame::SpilledScope spilled_scope;
-  Comment cmnt(masm_, "[ Slot");
-  LoadFromSlot(node, typeof_state());
-  ASSERT(frame_->height() == original_height + 1);
+  UNIMPLEMENTED_MIPS();
 }
 
 
 void CodeGenerator::VisitVariableProxy(VariableProxy* node) {
-#ifdef DEBUG
-  int original_height = frame_->height();
-#endif
-  VirtualFrame::SpilledScope spilled_scope;
-  Comment cmnt(masm_, "[ VariableProxy");
-
-  Variable* var = node->var();
-  Expression* expr = var->rewrite();
-  if (expr != NULL) {
-    Visit(expr);
-  } else {
-    ASSERT(var->is_global());
-    Reference ref(this, node);
-    ref.GetValueAndSpill();
-  }
-  ASSERT(frame_->height() == original_height + 1);
+  UNIMPLEMENTED_MIPS();
 }
 
 
 void CodeGenerator::VisitLiteral(Literal* node) {
-#ifdef DEBUG
-  int original_height = frame_->height();
-#endif
-  VirtualFrame::SpilledScope spilled_scope;
-  Comment cmnt(masm_, "[ Literal");
-  __ li(t0, Operand(node->handle()));
-  frame_->EmitPush(t0);
-  ASSERT(frame_->height() == original_height + 1);
+  UNIMPLEMENTED_MIPS();
 }
 
 
@@ -673,48 +591,23 @@ void CodeGenerator::VisitCatchExtensionObject(CatchExtensionObject* node) {
 }
 
 
+void CodeGenerator::EmitSlotAssignment(Assignment* node) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void CodeGenerator::EmitNamedPropertyAssignment(Assignment* node) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void CodeGenerator::EmitKeyedPropertyAssignment(Assignment* node) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
 void CodeGenerator::VisitAssignment(Assignment* node) {
-#ifdef DEBUG
-  int original_height = frame_->height();
-#endif
-  VirtualFrame::SpilledScope spilled_scope;
-  Comment cmnt(masm_, "[ Assignment");
-
-  { Reference target(this, node->target());
-    if (target.is_illegal()) {
-      // Fool the virtual frame into thinking that we left the assignment's
-      // value on the frame.
-      frame_->EmitPush(zero_reg);
-      ASSERT(frame_->height() == original_height + 1);
-      return;
-    }
-
-    if (node->op() == Token::ASSIGN ||
-        node->op() == Token::INIT_VAR ||
-        node->op() == Token::INIT_CONST) {
-      LoadAndSpill(node->value());
-    } else {
-      UNIMPLEMENTED_MIPS();
-    }
-
-    Variable* var = node->target()->AsVariableProxy()->AsVariable();
-    if (var != NULL &&
-        (var->mode() == Variable::CONST) &&
-        node->op() != Token::INIT_VAR && node->op() != Token::INIT_CONST) {
-      // Assignment ignored - leave the value on the stack.
-    } else {
-      CodeForSourcePosition(node->position());
-      if (node->op() == Token::INIT_CONST) {
-        // Dynamic constant initializations must use the function context
-        // and initialize the actual constant declared. Dynamic variable
-        // initializations are simply assignments and use SetValue.
-        target.SetValue(CONST_INIT);
-      } else {
-        target.SetValue(NOT_CONST_INIT);
-      }
-    }
-  }
-  ASSERT(frame_->height() == original_height + 1);
+  UNIMPLEMENTED_MIPS();
 }
 
 
@@ -729,73 +622,7 @@ void CodeGenerator::VisitProperty(Property* node) {
 
 
 void CodeGenerator::VisitCall(Call* node) {
-#ifdef DEBUG
-  int original_height = frame_->height();
-#endif
-  VirtualFrame::SpilledScope spilled_scope;
-  Comment cmnt(masm_, "[ Call");
-
-  Expression* function = node->expression();
-  ZoneList<Expression*>* args = node->arguments();
-
-  // Standard function call.
-  // Check if the function is a variable or a property.
-  Variable* var = function->AsVariableProxy()->AsVariable();
-  Property* property = function->AsProperty();
-
-  // ------------------------------------------------------------------------
-  // Fast-case: Use inline caching.
-  // ---
-  // According to ECMA-262, section 11.2.3, page 44, the function to call
-  // must be resolved after the arguments have been evaluated. The IC code
-  // automatically handles this by loading the arguments before the function
-  // is resolved in cache misses (this also holds for megamorphic calls).
-  // ------------------------------------------------------------------------
-
-  if (var != NULL && var->is_possibly_eval()) {
-    UNIMPLEMENTED_MIPS();
-  } else if (var != NULL && !var->is_this() && var->is_global()) {
-    // ----------------------------------
-    // JavaScript example: 'foo(1, 2, 3)'  // foo is global
-    // ----------------------------------
-
-    int arg_count = args->length();
-
-    // We need sp to be 8 bytes aligned when calling the stub.
-    __ SetupAlignedCall(t0, arg_count);
-
-    // Pass the global object as the receiver and let the IC stub
-    // patch the stack to use the global proxy as 'this' in the
-    // invoked function.
-    LoadGlobal();
-
-    // Load the arguments.
-    for (int i = 0; i < arg_count; i++) {
-      LoadAndSpill(args->at(i));
-    }
-
-    // Setup the receiver register and call the IC initialization code.
-    __ li(a2, Operand(var->name()));
-    InLoopFlag in_loop = loop_nesting() > 0 ? IN_LOOP : NOT_IN_LOOP;
-    Handle<Code> stub = ComputeCallInitialize(arg_count, in_loop);
-    CodeForSourcePosition(node->position());
-    frame_->CallCodeObject(stub, RelocInfo::CODE_TARGET_CONTEXT,
-                           arg_count + 1);
-    __ ReturnFromAlignedCall();
-    __ lw(cp, frame_->Context());
-    // Remove the function from the stack.
-    frame_->EmitPush(v0);
-
-  } else if (var != NULL && var->slot() != NULL &&
-             var->slot()->type() == Slot::LOOKUP) {
-    UNIMPLEMENTED_MIPS();
-  } else if (property != NULL) {
-    UNIMPLEMENTED_MIPS();
-  } else {
-    UNIMPLEMENTED_MIPS();
-  }
-
-  ASSERT(frame_->height() == original_height + 1);
+  UNIMPLEMENTED_MIPS();
 }
 
 
@@ -839,30 +666,112 @@ void CodeGenerator::GenerateMathPow(ZoneList<Expression*>* args) {
 }
 
 
-void CodeGenerator::GenerateMathCos(ZoneList<Expression*>* args) {
+void CodeGenerator::GenerateMathSqrt(ZoneList<Expression*>* args) {
   UNIMPLEMENTED_MIPS();
 }
 
 
-void CodeGenerator::GenerateMathSin(ZoneList<Expression*>* args) {
+class DeferredStringCharCodeAt : public DeferredCode {
+ public:
+  DeferredStringCharCodeAt(Register object,
+                           Register index,
+                           Register scratch,
+                           Register result)
+      : result_(result),
+        char_code_at_generator_(object,
+                                index,
+                                scratch,
+                                result,
+                                &need_conversion_,
+                                &need_conversion_,
+                                &index_out_of_range_,
+                                STRING_INDEX_IS_NUMBER) {}
+
+  StringCharCodeAtGenerator* fast_case_generator() {
+    return &char_code_at_generator_;
+  }
+
+  virtual void Generate() {
+    UNIMPLEMENTED_MIPS();
+  }
+
+ private:
+  Register result_;
+
+  Label need_conversion_;
+  Label index_out_of_range_;
+
+  StringCharCodeAtGenerator char_code_at_generator_;
+};
+
+
+void CodeGenerator::GenerateStringCharCodeAt(ZoneList<Expression*>* args) {
   UNIMPLEMENTED_MIPS();
 }
 
 
-void CodeGenerator::GenerateMathSqrt(ZoneList<Expression*>* args) {
+class DeferredStringCharFromCode : public DeferredCode {
+ public:
+  DeferredStringCharFromCode(Register code,
+                             Register result)
+      : char_from_code_generator_(code, result) {}
+
+  StringCharFromCodeGenerator* fast_case_generator() {
+    return &char_from_code_generator_;
+  }
+
+  virtual void Generate() {
+    VirtualFrameRuntimeCallHelper call_helper(frame_state());
+    char_from_code_generator_.GenerateSlow(masm(), call_helper);
+  }
+
+ private:
+  StringCharFromCodeGenerator char_from_code_generator_;
+};
+
+
+void CodeGenerator::GenerateStringCharFromCode(ZoneList<Expression*>* args) {
   UNIMPLEMENTED_MIPS();
 }
 
 
-// This should generate code that performs a charCodeAt() call or returns
-// undefined in order to trigger the slow case, Runtime_StringCharCodeAt.
-// It is not yet implemented on ARM, so it always goes to the slow case.
-void CodeGenerator::GenerateFastCharCodeAt(ZoneList<Expression*>* args) {
+class DeferredStringCharAt : public DeferredCode {
+ public:
+  DeferredStringCharAt(Register object,
+                       Register index,
+                       Register scratch1,
+                       Register scratch2,
+                       Register result)
+      : result_(result),
+        char_at_generator_(object,
+                           index,
+                           scratch1,
+                           scratch2,
+                           result,
+                           &need_conversion_,
+                           &need_conversion_,
+                           &index_out_of_range_,
+                           STRING_INDEX_IS_NUMBER) {}
+
+  StringCharAtGenerator* fast_case_generator() {
+    return &char_at_generator_;
+  }
+
+  virtual void Generate() {
   UNIMPLEMENTED_MIPS();
 }
 
+ private:
+  Register result_;
 
-void CodeGenerator::GenerateCharFromCode(ZoneList<Expression*>* args) {
+  Label need_conversion_;
+  Label index_out_of_range_;
+
+  StringCharAtGenerator char_at_generator_;
+};
+
+
+void CodeGenerator::GenerateStringCharAt(ZoneList<Expression*>* args) {
   UNIMPLEMENTED_MIPS();
 }
 
@@ -877,47 +786,72 @@ void CodeGenerator::GenerateIsRegExp(ZoneList<Expression*>* args) {
 }
 
 
-void CodeGenerator::GenerateIsConstructCall(ZoneList<Expression*>* args) {
+void CodeGenerator::GenerateIsObject(ZoneList<Expression*>* args) {
   UNIMPLEMENTED_MIPS();
 }
 
 
-void CodeGenerator::GenerateArgumentsLength(ZoneList<Expression*>* args) {
+void CodeGenerator::GenerateIsSpecObject(ZoneList<Expression*>* args) {
   UNIMPLEMENTED_MIPS();
 }
 
 
-void CodeGenerator::GenerateArguments(ZoneList<Expression*>* args) {
+class DeferredIsStringWrapperSafeForDefaultValueOf : public DeferredCode {
+ public:
+  DeferredIsStringWrapperSafeForDefaultValueOf(Register object,
+                                               Register map_result,
+                                               Register scratch1,
+                                               Register scratch2)
+      : object_(object),
+        map_result_(map_result),
+        scratch1_(scratch1),
+        scratch2_(scratch2) { }
+
+  virtual void Generate() {
+    UNIMPLEMENTED_MIPS();
+  }
+
+ private:
+  Register object_;
+  Register map_result_;
+  Register scratch1_;
+  Register scratch2_;
+};
+
+
+void CodeGenerator::GenerateIsStringWrapperSafeForDefaultValueOf(
+    ZoneList<Expression*>* args) {
   UNIMPLEMENTED_MIPS();
 }
 
 
-void CodeGenerator::GenerateRandomHeapNumber(ZoneList<Expression*>* args) {
+void CodeGenerator::GenerateIsFunction(ZoneList<Expression*>* args) {
   UNIMPLEMENTED_MIPS();
 }
 
 
-void CodeGenerator::GenerateObjectEquals(ZoneList<Expression*>* args) {
+void CodeGenerator::GenerateIsUndetectableObject(ZoneList<Expression*>* args) {
   UNIMPLEMENTED_MIPS();
 }
 
 
-void CodeGenerator::GenerateIsObject(ZoneList<Expression*>* args) {
+void CodeGenerator::GenerateIsConstructCall(ZoneList<Expression*>* args) {
   UNIMPLEMENTED_MIPS();
 }
 
 
-void CodeGenerator::GenerateIsSpecObject(ZoneList<Expression*>* args) {
+void CodeGenerator::GenerateArgumentsLength(ZoneList<Expression*>* args) {
   UNIMPLEMENTED_MIPS();
 }
 
 
-void CodeGenerator::GenerateIsFunction(ZoneList<Expression*>* args) {
+void CodeGenerator::GenerateArguments(ZoneList<Expression*>* args) {
   UNIMPLEMENTED_MIPS();
 }
 
 
-void CodeGenerator::GenerateIsUndetectableObject(ZoneList<Expression*>* args) {
+void CodeGenerator::GenerateRandomHeapNumber(
+    ZoneList<Expression*>* args) {
   UNIMPLEMENTED_MIPS();
 }
 
@@ -942,493 +876,333 @@ void CodeGenerator::GenerateRegExpExec(ZoneList<Expression*>* args) {
 }
 
 
-void CodeGenerator::GenerateNumberToString(ZoneList<Expression*>* args) {
+void CodeGenerator::GenerateRegExpConstructResult(ZoneList<Expression*>* args) {
   UNIMPLEMENTED_MIPS();
 }
 
 
-void CodeGenerator::VisitCallRuntime(CallRuntime* node) {
+class DeferredSearchCache: public DeferredCode {
+ public:
+  DeferredSearchCache(Register dst, Register cache, Register key)
+      : dst_(dst), cache_(cache), key_(key) {
+    set_comment("[ DeferredSearchCache");
+  }
+
+  virtual void Generate();
+
+ private:
+  Register dst_, cache_, key_;
+};
+
+
+void DeferredSearchCache::Generate() {
   UNIMPLEMENTED_MIPS();
 }
 
 
-void CodeGenerator::VisitUnaryOperation(UnaryOperation* node) {
+void CodeGenerator::GenerateGetFromCache(ZoneList<Expression*>* args) {
   UNIMPLEMENTED_MIPS();
 }
 
 
-void CodeGenerator::VisitCountOperation(CountOperation* node) {
+void CodeGenerator::GenerateNumberToString(ZoneList<Expression*>* args) {
   UNIMPLEMENTED_MIPS();
 }
 
 
-void CodeGenerator::VisitBinaryOperation(BinaryOperation* node) {
+class DeferredSwapElements: public DeferredCode {
+ public:
+  DeferredSwapElements(Register object, Register index1, Register index2)
+      : object_(object), index1_(index1), index2_(index2) {
+    set_comment("[ DeferredSwapElements");
+  }
+
+  virtual void Generate();
+
+ private:
+  Register object_, index1_, index2_;
+};
+
+
+void DeferredSwapElements::Generate() {
   UNIMPLEMENTED_MIPS();
 }
 
 
-void CodeGenerator::VisitThisFunction(ThisFunction* node) {
+void CodeGenerator::GenerateSwapElements(ZoneList<Expression*>* args) {
   UNIMPLEMENTED_MIPS();
 }
 
 
-void CodeGenerator::VisitCompareOperation(CompareOperation* node) {
+void CodeGenerator::GenerateCallFunction(ZoneList<Expression*>* args) {
   UNIMPLEMENTED_MIPS();
 }
 
 
-#ifdef DEBUG
-bool CodeGenerator::HasValidEntryRegisters() { return true; }
-#endif
+void CodeGenerator::GenerateMathSin(ZoneList<Expression*>* args) {
+  UNIMPLEMENTED_MIPS();
+}
 
 
-#undef __
-#define __ ACCESS_MASM(masm)
+void CodeGenerator::GenerateMathCos(ZoneList<Expression*>* args) {
+  UNIMPLEMENTED_MIPS();
+}
 
-// -----------------------------------------------------------------------------
-// Reference support
 
-Reference::Reference(CodeGenerator* cgen,
-                     Expression* expression,
-                     bool persist_after_get)
-    : cgen_(cgen),
-      expression_(expression),
-      type_(ILLEGAL),
-      persist_after_get_(persist_after_get) {
-  cgen->LoadReference(this);
+void CodeGenerator::GenerateMathLog(ZoneList<Expression*>* args) {
+  UNIMPLEMENTED_MIPS();
 }
 
 
-Reference::~Reference() {
-  ASSERT(is_unloaded() || is_illegal());
+void CodeGenerator::GenerateObjectEquals(ZoneList<Expression*>* args) {
+  UNIMPLEMENTED_MIPS();
 }
 
 
-Handle<String> Reference::GetName() {
-  ASSERT(type_ == NAMED);
-  Property* property = expression_->AsProperty();
-  if (property == NULL) {
-    // Global variable reference treated as a named property reference.
-    VariableProxy* proxy = expression_->AsVariableProxy();
-    ASSERT(proxy->AsVariable() != NULL);
-    ASSERT(proxy->AsVariable()->is_global());
-    return proxy->name();
-  } else {
-    Literal* raw_name = property->key()->AsLiteral();
-    ASSERT(raw_name != NULL);
-    return Handle<String>(String::cast(*raw_name->handle()));
-  }
+void CodeGenerator::GenerateIsRegExpEquivalent(ZoneList<Expression*>* args) {
+  UNIMPLEMENTED_MIPS();
 }
 
 
-void Reference::GetValue() {
-  ASSERT(cgen_->HasValidEntryRegisters());
-  ASSERT(!is_illegal());
-  ASSERT(!cgen_->has_cc());
-  Property* property = expression_->AsProperty();
-  if (property != NULL) {
-    cgen_->CodeForSourcePosition(property->position());
-  }
+void CodeGenerator::GenerateHasCachedArrayIndex(ZoneList<Expression*>* args) {
+  UNIMPLEMENTED_MIPS();
+}
 
-  switch (type_) {
-    case SLOT: {
-      UNIMPLEMENTED_MIPS();
-      break;
-    }
 
-    case NAMED: {
-      UNIMPLEMENTED_MIPS();
-      break;
-    }
+void CodeGenerator::GenerateGetCachedArrayIndex(ZoneList<Expression*>* args) {
+  UNIMPLEMENTED_MIPS();
+}
 
-    case KEYED: {
-      UNIMPLEMENTED_MIPS();
-      break;
-    }
 
-    default:
-      UNREACHABLE();
-  }
+void CodeGenerator::GenerateFastAsciiArrayJoin(ZoneList<Expression*>* args) {
+  UNIMPLEMENTED_MIPS();
 }
 
 
-void Reference::SetValue(InitState init_state) {
-  ASSERT(!is_illegal());
-  ASSERT(!cgen_->has_cc());
-  MacroAssembler* masm = cgen_->masm();
-  Property* property = expression_->AsProperty();
-  if (property != NULL) {
-    cgen_->CodeForSourcePosition(property->position());
-  }
+void CodeGenerator::VisitCallRuntime(CallRuntime* node) {
+  UNIMPLEMENTED_MIPS();
+}
+
 
-  switch (type_) {
-    case SLOT: {
-      Comment cmnt(masm, "[ Store to Slot");
-      Slot* slot = expression_->AsVariableProxy()->AsVariable()->slot();
-      cgen_->StoreToSlot(slot, init_state);
-      cgen_->UnloadReference(this);
-      break;
-    }
-
-    case NAMED: {
-      UNIMPLEMENTED_MIPS();
-      break;
-    }
-
-    case KEYED: {
-      UNIMPLEMENTED_MIPS();
-      break;
-    }
-
-    default:
-      UNREACHABLE();
+void CodeGenerator::VisitUnaryOperation(UnaryOperation* node) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+class DeferredCountOperation: public DeferredCode {
+ public:
+  DeferredCountOperation(Register value,
+                         bool is_increment,
+                         bool is_postfix,
+                         int target_size)
+      : value_(value),
+        is_increment_(is_increment),
+        is_postfix_(is_postfix),
+        target_size_(target_size) {}
+
+  virtual void Generate() {
+    UNIMPLEMENTED_MIPS();
   }
+
+ private:
+  Register value_;
+  bool is_increment_;
+  bool is_postfix_;
+  int target_size_;
+};
+
+
+void CodeGenerator::VisitCountOperation(CountOperation* node) {
+  UNIMPLEMENTED_MIPS();
 }
 
 
-// On entry a0 and a1 are the things to be compared. On exit v0 is 0,
-// positive or negative to indicate the result of the comparison.
-void CompareStub::Generate(MacroAssembler* masm) {
+void CodeGenerator::GenerateLogicalBooleanOperation(BinaryOperation* node) {
   UNIMPLEMENTED_MIPS();
-  __ break_(0x765);
 }
 
 
-Handle<Code> GetBinaryOpStub(int key, BinaryOpIC::TypeInfo type_info) {
+void CodeGenerator::VisitBinaryOperation(BinaryOperation* node) {
   UNIMPLEMENTED_MIPS();
-  return Handle<Code>::null();
 }
 
 
-void StackCheckStub::Generate(MacroAssembler* masm) {
+void CodeGenerator::VisitThisFunction(ThisFunction* node) {
   UNIMPLEMENTED_MIPS();
-  __ break_(0x790);
 }
 
 
-void CEntryStub::GenerateThrowTOS(MacroAssembler* masm) {
+void CodeGenerator::VisitCompareOperation(CompareOperation* node) {
   UNIMPLEMENTED_MIPS();
-  __ break_(0x808);
 }
 
 
-void CEntryStub::GenerateThrowUncatchable(MacroAssembler* masm,
-                                          UncatchableExceptionType type) {
+void CodeGenerator::VisitCompareToNull(CompareToNull* node) {
   UNIMPLEMENTED_MIPS();
-  __ break_(0x815);
 }
 
-void CEntryStub::GenerateCore(MacroAssembler* masm,
-                              Label* throw_normal_exception,
-                              Label* throw_termination_exception,
-                              Label* throw_out_of_memory_exception,
-                              bool do_gc,
-                              bool always_allocate) {
-  // s0: number of arguments including receiver (C callee-saved)
-  // s1: pointer to the first argument          (C callee-saved)
-  // s2: pointer to builtin function            (C callee-saved)
 
-  if (do_gc) {
-    UNIMPLEMENTED_MIPS();
+class DeferredReferenceGetNamedValue: public DeferredCode {
+ public:
+  explicit DeferredReferenceGetNamedValue(Register receiver,
+                                          Handle<String> name,
+                                          bool is_contextual)
+      : receiver_(receiver),
+        name_(name),
+        is_contextual_(is_contextual),
+        is_dont_delete_(false) {
+    set_comment(is_contextual
+                ? "[ DeferredReferenceGetNamedValue (contextual)"
+                : "[ DeferredReferenceGetNamedValue");
   }
 
-  ExternalReference scope_depth =
-      ExternalReference::heap_always_allocate_scope_depth();
-  if (always_allocate) {
-    UNIMPLEMENTED_MIPS();
+  virtual void Generate();
+
+  void set_is_dont_delete(bool value) {
+    ASSERT(is_contextual_);
+    is_dont_delete_ = value;
   }
 
-  // Call C built-in.
-  // a0 = argc, a1 = argv
-  __ mov(a0, s0);
-  __ mov(a1, s1);
+ private:
+  Register receiver_;
+  Handle<String> name_;
+  bool is_contextual_;
+  bool is_dont_delete_;
+};
 
-  __ CallBuiltin(s2);
 
-  if (always_allocate) {
-    UNIMPLEMENTED_MIPS();
+
+void DeferredReferenceGetNamedValue::Generate() {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+class DeferredReferenceGetKeyedValue: public DeferredCode {
+ public:
+  DeferredReferenceGetKeyedValue(Register key, Register receiver)
+      : key_(key), receiver_(receiver) {
+    set_comment("[ DeferredReferenceGetKeyedValue");
   }
 
-  // Check for failure result.
-  Label failure_returned;
-  ASSERT(((kFailureTag + 1) & kFailureTagMask) == 0);
-  __ addiu(a2, v0, 1);
-  __ andi(t0, a2, kFailureTagMask);
-  __ Branch(eq, &failure_returned, t0, Operand(zero_reg));
-
-  // Exit C frame and return.
-  // v0:v1: result
-  // sp: stack pointer
-  // fp: frame pointer
-  __ LeaveExitFrame(mode_);
-
-  // Check if we should retry or throw exception.
-  Label retry;
-  __ bind(&failure_returned);
-  ASSERT(Failure::RETRY_AFTER_GC == 0);
-  __ andi(t0, v0, ((1 << kFailureTypeTagSize) - 1) << kFailureTagSize);
-  __ Branch(eq, &retry, t0, Operand(zero_reg));
-
-  // Special handling of out of memory exceptions.
-  Failure* out_of_memory = Failure::OutOfMemoryException();
-  __ Branch(eq, throw_out_of_memory_exception,
-            v0, Operand(reinterpret_cast<int32_t>(out_of_memory)));
-
-  // Retrieve the pending exception and clear the variable.
-  __ LoadExternalReference(t0, ExternalReference::the_hole_value_location());
-  __ lw(a3, MemOperand(t0));
-  __ LoadExternalReference(t0,
-      ExternalReference(Isolate::k_pending_exception_address));
-  __ lw(v0, MemOperand(t0));
-  __ sw(a3, MemOperand(t0));
-
-  // Special handling of termination exceptions which are uncatchable
-  // by javascript code.
-  __ Branch(eq, throw_termination_exception,
-            v0, Operand(FACTORY->termination_exception()));
-
-  // Handle normal exception.
-  __ b(throw_normal_exception);
-  __ nop();   // Branch delay slot nop.
-
-  __ bind(&retry);  // pass last failure (r0) as parameter (r0) when retrying
-}
-
-void CEntryStub::Generate(MacroAssembler* masm) {
-  // Called from JavaScript; parameters are on stack as if calling JS function
-  // a0: number of arguments including receiver
-  // a1: pointer to builtin function
-  // fp: frame pointer    (restored after C call)
-  // sp: stack pointer    (restored as callee's sp after C call)
-  // cp: current context  (C callee-saved)
-
-  // NOTE: Invocations of builtins may return failure objects
-  // instead of a proper result. The builtin entry handles
-  // this by performing a garbage collection and retrying the
-  // builtin once.
-
-  // Enter the exit frame that transitions from JavaScript to C++.
-  __ EnterExitFrame(mode_, s0, s1, s2);
-
-  // s0: number of arguments (C callee-saved)
-  // s1: pointer to first argument (C callee-saved)
-  // s2: pointer to builtin function (C callee-saved)
-
-  Label throw_normal_exception;
-  Label throw_termination_exception;
-  Label throw_out_of_memory_exception;
-
-  // Call into the runtime system.
-  GenerateCore(masm,
-               &throw_normal_exception,
-               &throw_termination_exception,
-               &throw_out_of_memory_exception,
-               false,
-               false);
-
-  // Do space-specific GC and retry runtime call.
-  GenerateCore(masm,
-               &throw_normal_exception,
-               &throw_termination_exception,
-               &throw_out_of_memory_exception,
-               true,
-               false);
-
-  // Do full GC and retry runtime call one final time.
-  Failure* failure = Failure::InternalError();
-  __ li(v0, Operand(reinterpret_cast<int32_t>(failure)));
-  GenerateCore(masm,
-               &throw_normal_exception,
-               &throw_termination_exception,
-               &throw_out_of_memory_exception,
-               true,
-               true);
-
-  __ bind(&throw_out_of_memory_exception);
-  GenerateThrowUncatchable(masm, OUT_OF_MEMORY);
-
-  __ bind(&throw_termination_exception);
-  GenerateThrowUncatchable(masm, TERMINATION);
-
-  __ bind(&throw_normal_exception);
-  GenerateThrowTOS(masm);
-}
-
-void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
-  Label invoke, exit;
-
-  // Registers:
-  // a0: entry address
-  // a1: function
-  // a2: reveiver
-  // a3: argc
-  //
-  // Stack:
-  // 4 args slots
-  // args
-
-  // Save callee saved registers on the stack.
-  __ MultiPush((kCalleeSaved | ra.bit()) & ~sp.bit());
-
-  // We build an EntryFrame.
-  __ li(t3, Operand(-1));  // Push a bad frame pointer to fail if it is used.
-  int marker = is_construct ? StackFrame::ENTRY_CONSTRUCT : StackFrame::ENTRY;
-  __ li(t2, Operand(Smi::FromInt(marker)));
-  __ li(t1, Operand(Smi::FromInt(marker)));
-  __ LoadExternalReference(t0,
-      ExternalReference(Isolate::k_c_entry_fp_address));
-  __ lw(t0, MemOperand(t0));
-  __ MultiPush(t0.bit() | t1.bit() | t2.bit() | t3.bit());
-
-  // Setup frame pointer for the frame to be pushed.
-  __ addiu(fp, sp, -EntryFrameConstants::kCallerFPOffset);
-
-  // Load argv in s0 register.
-  __ lw(s0, MemOperand(sp, (kNumCalleeSaved + 1) * kPointerSize +
-                           StandardFrameConstants::kCArgsSlotsSize));
-
-  // Registers:
-  // a0: entry_address
-  // a1: function
-  // a2: reveiver_pointer
-  // a3: argc
-  // s0: argv
-  //
-  // Stack:
-  // caller fp          |
-  // function slot      | entry frame
-  // context slot       |
-  // bad fp (0xff...f)  |
-  // callee saved registers + ra
-  // 4 args slots
-  // args
-
-  // Call a faked try-block that does the invoke.
-  __ bal(&invoke);
-  __ nop();   // Branch delay slot nop.
-
-  // Caught exception: Store result (exception) in the pending
-  // exception field in the JSEnv and return a failure sentinel.
-  // Coming in here the fp will be invalid because the PushTryHandler below
-  // sets it to 0 to signal the existence of the JSEntry frame.
-  __ LoadExternalReference(t0,
-      ExternalReference(Isolate::k_pending_exception_address));
-  __ sw(v0, MemOperand(t0));  // We come back from 'invoke'. result is in v0.
-  __ li(v0, Operand(reinterpret_cast<int32_t>(Failure::Exception())));
-  __ b(&exit);
-  __ nop();   // Branch delay slot nop.
-
-  // Invoke: Link this frame into the handler chain.
-  __ bind(&invoke);
-  __ PushTryHandler(IN_JS_ENTRY, JS_ENTRY_HANDLER);
-  // If an exception not caught by another handler occurs, this handler
-  // returns control to the code after the bal(&invoke) above, which
-  // restores all kCalleeSaved registers (including cp and fp) to their
-  // saved values before returning a failure to C.
-
-  // Clear any pending exceptions.
-  __ LoadExternalReference(t0, ExternalReference::the_hole_value_location());
-  __ lw(t1, MemOperand(t0));
-  __ LoadExternalReference(t0,
-      ExternalReference(Isolate::k_pending_exception_address));
-  __ sw(t1, MemOperand(t0));
-
-  // Invoke the function by calling through JS entry trampoline builtin.
-  // Notice that we cannot store a reference to the trampoline code directly in
-  // this stub, because runtime stubs are not traversed when doing GC.
-
-  // Registers:
-  // a0: entry_address
-  // a1: function
-  // a2: reveiver_pointer
-  // a3: argc
-  // s0: argv
-  //
-  // Stack:
-  // handler frame
-  // entry frame
-  // callee saved registers + ra
-  // 4 args slots
-  // args
-
-  if (is_construct) {
-    ExternalReference construct_entry(Builtins::JSConstructEntryTrampoline);
-    __ LoadExternalReference(t0, construct_entry);
-  } else {
-    ExternalReference entry(Builtins::JSEntryTrampoline);
-    __ LoadExternalReference(t0, entry);
+  virtual void Generate();
+
+ private:
+  Register key_;
+  Register receiver_;
+};
+
+
+void DeferredReferenceGetKeyedValue::Generate() {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+class DeferredReferenceSetKeyedValue: public DeferredCode {
+ public:
+  DeferredReferenceSetKeyedValue(Register value,
+                                 Register key,
+                                 Register receiver)
+      : value_(value), key_(key), receiver_(receiver) {
+    set_comment("[ DeferredReferenceSetKeyedValue");
   }
-  __ lw(t9, MemOperand(t0));  // deref address
 
-  // Call JSEntryTrampoline.
-  __ addiu(t9, t9, Code::kHeaderSize - kHeapObjectTag);
-  __ CallBuiltin(t9);
+  virtual void Generate();
 
-  // Unlink this frame from the handler chain. When reading the
-  // address of the next handler, there is no need to use the address
-  // displacement since the current stack pointer (sp) points directly
-  // to the stack handler.
-  __ lw(t1, MemOperand(sp, StackHandlerConstants::kNextOffset));
-  __ LoadExternalReference(t0, ExternalReference(Isolate::k_handler_address));
-  __ sw(t1, MemOperand(t0));
+ private:
+  Register value_;
+  Register key_;
+  Register receiver_;
+};
 
-  // This restores sp to its position before PushTryHandler.
-  __ addiu(sp, sp, StackHandlerConstants::kSize);
 
-  __ bind(&exit);  // v0 holds result
-  // Restore the top frame descriptors from the stack.
-  __ Pop(t1);
-  __ LoadExternalReference(t0,
-                           ExternalReference(Isolate::k_c_entry_fp_address));
-  __ sw(t1, MemOperand(t0));
+void DeferredReferenceSetKeyedValue::Generate() {
+  UNIMPLEMENTED_MIPS();
+}
+
 
-  // Reset the stack to the callee saved registers.
-  __ addiu(sp, sp, -EntryFrameConstants::kCallerFPOffset);
+class DeferredReferenceSetNamedValue: public DeferredCode {
+ public:
+  DeferredReferenceSetNamedValue(Register value,
+                                 Register receiver,
+                                 Handle<String> name)
+      : value_(value), receiver_(receiver), name_(name) {
+    set_comment("[ DeferredReferenceSetNamedValue");
+  }
 
-  // Restore callee saved registers from the stack.
-  __ MultiPop((kCalleeSaved | ra.bit()) & ~sp.bit());
-  // Return.
-  __ Jump(ra);
+  virtual void Generate();
+
+ private:
+  Register value_;
+  Register receiver_;
+  Handle<String> name_;
+};
+
+
+void DeferredReferenceSetNamedValue::Generate() {
+  UNIMPLEMENTED_MIPS();
 }
 
 
-// This stub performs an instanceof, calling the builtin function if
-// necessary. Uses a1 for the object, a0 for the function that it may
-// be an instance of (these are fetched from the stack).
-void InstanceofStub::Generate(MacroAssembler* masm) {
+void CodeGenerator::EmitNamedLoad(Handle<String> name, bool is_contextual) {
   UNIMPLEMENTED_MIPS();
-  __ break_(0x845);
 }
 
 
-void ArgumentsAccessStub::GenerateReadLength(MacroAssembler* masm) {
+void CodeGenerator::EmitNamedStore(Handle<String> name, bool is_contextual) {
   UNIMPLEMENTED_MIPS();
-  __ break_(0x851);
 }
 
 
-void ArgumentsAccessStub::GenerateReadElement(MacroAssembler* masm) {
+void CodeGenerator::EmitKeyedLoad() {
   UNIMPLEMENTED_MIPS();
-  __ break_(0x857);
 }
 
 
-void ArgumentsAccessStub::GenerateNewObject(MacroAssembler* masm) {
+void CodeGenerator::EmitKeyedStore(StaticType* key_type,
+                                   WriteBarrierCharacter wb_info) {
   UNIMPLEMENTED_MIPS();
-  __ break_(0x863);
 }
 
 
-const char* CompareStub::GetName() {
+#ifdef DEBUG
+bool CodeGenerator::HasValidEntryRegisters() {
   UNIMPLEMENTED_MIPS();
-  return NULL;  // UNIMPLEMENTED RETURN
+  return false;
 }
+#endif
 
 
-int CompareStub::MinorKey() {
-  // Encode the two parameters in a unique 16 bit value.
-  ASSERT(static_cast<unsigned>(cc_) >> 28 < (1 << 15));
-  return (static_cast<unsigned>(cc_) >> 27) | (strict_ ? 1 : 0);
+#undef __
+#define __ ACCESS_MASM(masm)
+
+// -----------------------------------------------------------------------------
+// Reference support.
+
+
+Handle<String> Reference::GetName() {
+  UNIMPLEMENTED_MIPS();
+  return Handle<String>();
+}
+
+
+void Reference::DupIfPersist() {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void Reference::GetValue() {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void Reference::SetValue(InitState init_state, WriteBarrierCharacter wb_info) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+const char* GenericBinaryOpStub::GetName() {
+  UNIMPLEMENTED_MIPS();
+  return name_;
 }