diff --git a/src/deoptimizer.cc b/src/deoptimizer.cc
index cb24b10..68f82ce 100644
--- a/src/deoptimizer.cc
+++ b/src/deoptimizer.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// 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:
@@ -104,10 +104,27 @@
   return result;
 }
 
+
+int Deoptimizer::ConvertJSFrameIndexToFrameIndex(int jsframe_index) {
+  if (jsframe_index == 0) return 0;
+
+  int frame_index = 0;
+  while (jsframe_index >= 0) {
+    FrameDescription* frame = output_[frame_index];
+    if (frame->GetFrameType() == StackFrame::JAVA_SCRIPT) {
+      jsframe_index--;
+    }
+    frame_index++;
+  }
+
+  return frame_index - 1;
+}
+
+
 #ifdef ENABLE_DEBUGGER_SUPPORT
 DeoptimizedFrameInfo* Deoptimizer::DebuggerInspectableFrame(
     JavaScriptFrame* frame,
-    int frame_index,
+    int jsframe_index,
     Isolate* isolate) {
   ASSERT(isolate == Isolate::Current());
   ASSERT(frame->is_optimized());
@@ -143,22 +160,40 @@
 
   // Create the GC safe output frame information and register it for GC
   // handling.
-  ASSERT_LT(frame_index, deoptimizer->output_count());
+  ASSERT_LT(jsframe_index, deoptimizer->jsframe_count());
+
+  // Convert JS frame index into frame index.
+  int frame_index = deoptimizer->ConvertJSFrameIndexToFrameIndex(jsframe_index);
+
+  bool has_arguments_adaptor =
+      frame_index > 0 &&
+      deoptimizer->output_[frame_index - 1]->GetFrameType() ==
+      StackFrame::ARGUMENTS_ADAPTOR;
+
   DeoptimizedFrameInfo* info =
-      new DeoptimizedFrameInfo(deoptimizer, frame_index);
+      new DeoptimizedFrameInfo(deoptimizer, frame_index, has_arguments_adaptor);
   isolate->deoptimizer_data()->deoptimized_frame_info_ = info;
 
   // Get the "simulated" top and size for the requested frame.
-  Address top =
-      reinterpret_cast<Address>(deoptimizer->output_[frame_index]->GetTop());
-  uint32_t size = deoptimizer->output_[frame_index]->GetFrameSize();
+  FrameDescription* parameters_frame =
+      deoptimizer->output_[
+          has_arguments_adaptor ? (frame_index - 1) : frame_index];
+
+  uint32_t parameters_size = (info->parameters_count() + 1) * kPointerSize;
+  Address parameters_top = reinterpret_cast<Address>(
+      parameters_frame->GetTop() + (parameters_frame->GetFrameSize() -
+                                    parameters_size));
+
+  uint32_t expressions_size = info->expression_count() * kPointerSize;
+  Address expressions_top = reinterpret_cast<Address>(
+      deoptimizer->output_[frame_index]->GetTop());
 
   // Done with the GC-unsafe frame descriptions. This re-enables allocation.
   deoptimizer->DeleteFrameDescriptions();
 
   // Allocate a heap number for the doubles belonging to this frame.
   deoptimizer->MaterializeHeapNumbersForDebuggerInspectableFrame(
-      top, size, info);
+      parameters_top, parameters_size, expressions_top, expressions_size, info);
 
   // Finished using the deoptimizer instance.
   delete deoptimizer;
@@ -313,6 +348,7 @@
       fp_to_sp_delta_(fp_to_sp_delta),
       input_(NULL),
       output_count_(0),
+      jsframe_count_(0),
       output_(NULL),
       frame_alignment_marker_(isolate->heap()->frame_alignment_marker()),
       has_alignment_padding_(0),
@@ -377,9 +413,7 @@
   ASSERT(HEAP->allow_allocation(false));
   unsigned size = ComputeInputFrameSize();
   input_ = new(size) FrameDescription(size, function);
-#ifdef DEBUG
-  input_->SetKind(Code::OPTIMIZED_FUNCTION);
-#endif
+  input_->SetFrameType(StackFrame::JAVA_SCRIPT);
 }
 
 
@@ -515,6 +549,7 @@
   // Read the number of output frames and allocate an array for their
   // descriptions.
   int count = iterator.Next();
+  iterator.Next();  // Drop JS frames count.
   ASSERT(output_ == NULL);
   output_ = new FrameDescription*[count];
   for (int i = 0; i < count; ++i) {
@@ -524,7 +559,21 @@
 
   // Translate each output frame.
   for (int i = 0; i < count; ++i) {
-    DoComputeFrame(&iterator, i);
+    // Read the ast node id, function, and frame height for this output frame.
+    Translation::Opcode opcode =
+        static_cast<Translation::Opcode>(iterator.Next());
+    switch (opcode) {
+      case Translation::JS_FRAME:
+        DoComputeJSFrame(&iterator, i);
+        jsframe_count_++;
+        break;
+      case Translation::ARGUMENTS_ADAPTOR_FRAME:
+        DoComputeArgumentsAdaptorFrame(&iterator, i);
+        break;
+      default:
+        UNREACHABLE();
+        break;
+    }
   }
 
   // Print some helpful diagnostic information.
@@ -565,39 +614,52 @@
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
 void Deoptimizer::MaterializeHeapNumbersForDebuggerInspectableFrame(
-    Address top, uint32_t size, DeoptimizedFrameInfo* info) {
+    Address parameters_top,
+    uint32_t parameters_size,
+    Address expressions_top,
+    uint32_t expressions_size,
+    DeoptimizedFrameInfo* info) {
   ASSERT_EQ(DEBUGGER, bailout_type_);
+  Address parameters_bottom = parameters_top + parameters_size;
+  Address expressions_bottom = expressions_top + expressions_size;
   for (int i = 0; i < deferred_heap_numbers_.length(); i++) {
     HeapNumberMaterializationDescriptor d = deferred_heap_numbers_[i];
 
     // Check of the heap number to materialize actually belong to the frame
     // being extracted.
     Address slot = d.slot_address();
-    if (top <= slot && slot < top + size) {
+    if (parameters_top <= slot && slot < parameters_bottom) {
       Handle<Object> num = isolate_->factory()->NewNumber(d.value());
-      // Calculate the index with the botton of the expression stack
-      // at index 0, and the fixed part (including incoming arguments)
-      // at negative indexes.
-      int index = static_cast<int>(
-          info->expression_count_ - (slot - top) / kPointerSize - 1);
+
+      int index = (info->parameters_count() - 1) -
+          static_cast<int>(slot - parameters_top) / kPointerSize;
+
       if (FLAG_trace_deopt) {
         PrintF("Materializing a new heap number %p [%e] in slot %p"
-               "for stack index %d\n",
+               "for parameter slot #%d\n",
                reinterpret_cast<void*>(*num),
                d.value(),
                d.slot_address(),
                index);
       }
-      if (index >=0) {
-        info->SetExpression(index, *num);
-      } else {
-        // Calculate parameter index subtracting one for the receiver.
-        int parameter_index =
-            index +
-            static_cast<int>(size) / kPointerSize -
-            info->expression_count_ - 1;
-        info->SetParameter(parameter_index, *num);
+
+      info->SetParameter(index, *num);
+    } else if (expressions_top <= slot && slot < expressions_bottom) {
+      Handle<Object> num = isolate_->factory()->NewNumber(d.value());
+
+      int index = info->expression_count() - 1 -
+          static_cast<int>(slot - expressions_top) / kPointerSize;
+
+      if (FLAG_trace_deopt) {
+        PrintF("Materializing a new heap number %p [%e] in slot %p"
+               "for expression slot #%d\n",
+               reinterpret_cast<void*>(*num),
+               d.value(),
+               d.slot_address(),
+               index);
       }
+
+      info->SetExpression(index, *num);
     }
   }
 }
@@ -622,7 +684,8 @@
 
   switch (opcode) {
     case Translation::BEGIN:
-    case Translation::FRAME:
+    case Translation::JS_FRAME:
+    case Translation::ARGUMENTS_ADAPTOR_FRAME:
     case Translation::DUPLICATE:
       UNREACHABLE();
       return;
@@ -691,7 +754,7 @@
     case Translation::STACK_SLOT: {
       int input_slot_index = iterator->Next();
       unsigned input_offset =
-          input_->GetOffsetFromSlotIndex(this, input_slot_index);
+          input_->GetOffsetFromSlotIndex(input_slot_index);
       intptr_t input_value = input_->GetFrameSlot(input_offset);
       if (FLAG_trace_deopt) {
         PrintF("    0x%08" V8PRIxPTR ": ",
@@ -710,7 +773,7 @@
     case Translation::INT32_STACK_SLOT: {
       int input_slot_index = iterator->Next();
       unsigned input_offset =
-          input_->GetOffsetFromSlotIndex(this, input_slot_index);
+          input_->GetOffsetFromSlotIndex(input_slot_index);
       intptr_t value = input_->GetFrameSlot(input_offset);
       bool is_smi = Smi::IsValid(value);
       if (FLAG_trace_deopt) {
@@ -739,7 +802,7 @@
     case Translation::DOUBLE_STACK_SLOT: {
       int input_slot_index = iterator->Next();
       unsigned input_offset =
-          input_->GetOffsetFromSlotIndex(this, input_slot_index);
+          input_->GetOffsetFromSlotIndex(input_slot_index);
       double value = input_->GetDoubleFrameSlot(input_offset);
       if (FLAG_trace_deopt) {
         PrintF("    0x%08" V8PRIxPTR ": [top + %d] <- %e ; [esp + %d]\n",
@@ -808,7 +871,8 @@
 
   switch (opcode) {
     case Translation::BEGIN:
-    case Translation::FRAME:
+    case Translation::JS_FRAME:
+    case Translation::ARGUMENTS_ADAPTOR_FRAME:
     case Translation::DUPLICATE:
       UNREACHABLE();  // Malformed input.
        return false;
@@ -871,7 +935,7 @@
     case Translation::STACK_SLOT: {
       int output_index = iterator->Next();
       unsigned output_offset =
-          output->GetOffsetFromSlotIndex(this, output_index);
+          output->GetOffsetFromSlotIndex(output_index);
       if (FLAG_trace_osr) {
         PrintF("    [sp + %d] <- 0x%08" V8PRIxPTR " ; [sp + %d] ",
                output_offset,
@@ -890,7 +954,7 @@
 
       int output_index = iterator->Next();
       unsigned output_offset =
-          output->GetOffsetFromSlotIndex(this, output_index);
+          output->GetOffsetFromSlotIndex(output_index);
       int int32_value = input_object->IsSmi()
           ? Smi::cast(input_object)->value()
           : DoubleToInt32(input_object->Number());
@@ -922,7 +986,7 @@
 
       int output_index = iterator->Next();
       unsigned output_offset =
-          output->GetOffsetFromSlotIndex(this, output_index);
+          output->GetOffsetFromSlotIndex(output_index);
       double double_value = input_object->Number();
       uint64_t int_value = BitCast<uint64_t, double>(double_value);
       int32_t lower = static_cast<int32_t>(int_value);
@@ -1033,8 +1097,8 @@
 unsigned Deoptimizer::ComputeFixedSize(JSFunction* function) const {
   // The fixed part of the frame consists of the return address, frame
   // pointer, function, context, and all the incoming arguments.
-  static const unsigned kFixedSlotSize = 4 * kPointerSize;
-  return ComputeIncomingArgumentSize(function) + kFixedSlotSize;
+  return ComputeIncomingArgumentSize(function) +
+      StandardFrameConstants::kFixedFrameSize;
 }
 
 
@@ -1155,49 +1219,62 @@
 }
 
 
-unsigned FrameDescription::GetOffsetFromSlotIndex(Deoptimizer* deoptimizer,
-                                                  int slot_index) {
+int FrameDescription::ComputeFixedSize() {
+  return StandardFrameConstants::kFixedFrameSize +
+      (ComputeParametersCount() + 1) * kPointerSize;
+}
+
+
+unsigned FrameDescription::GetOffsetFromSlotIndex(int slot_index) {
   if (slot_index >= 0) {
     // Local or spill slots. Skip the fixed part of the frame
     // including all arguments.
-    unsigned base =
-        GetFrameSize() - deoptimizer->ComputeFixedSize(GetFunction());
+    unsigned base = GetFrameSize() - ComputeFixedSize();
     return base - ((slot_index + 1) * kPointerSize);
   } else {
     // Incoming parameter.
-    unsigned base = GetFrameSize() -
-        deoptimizer->ComputeIncomingArgumentSize(GetFunction());
+    int arg_size = (ComputeParametersCount() + 1) * kPointerSize;
+    unsigned base = GetFrameSize() - arg_size;
     return base - ((slot_index + 1) * kPointerSize);
   }
 }
 
 
 int FrameDescription::ComputeParametersCount() {
-  return function_->shared()->formal_parameter_count();
+  switch (type_) {
+    case StackFrame::JAVA_SCRIPT:
+      return function_->shared()->formal_parameter_count();
+    case StackFrame::ARGUMENTS_ADAPTOR: {
+      // Last slot contains number of incomming arguments as a smi.
+      // Can't use GetExpression(0) because it would cause infinite recursion.
+      return reinterpret_cast<Smi*>(*GetFrameSlotPointer(0))->value();
+    }
+    default:
+      UNREACHABLE();
+      return 0;
+  }
 }
 
 
-Object* FrameDescription::GetParameter(Deoptimizer* deoptimizer, int index) {
-  ASSERT_EQ(Code::FUNCTION, kind_);
+Object* FrameDescription::GetParameter(int index) {
   ASSERT(index >= 0);
   ASSERT(index < ComputeParametersCount());
   // The slot indexes for incoming arguments are negative.
-  unsigned offset = GetOffsetFromSlotIndex(deoptimizer,
-                                           index - ComputeParametersCount());
+  unsigned offset = GetOffsetFromSlotIndex(index - ComputeParametersCount());
   return reinterpret_cast<Object*>(*GetFrameSlotPointer(offset));
 }
 
 
-unsigned FrameDescription::GetExpressionCount(Deoptimizer* deoptimizer) {
-  ASSERT_EQ(Code::FUNCTION, kind_);
-  unsigned size = GetFrameSize() - deoptimizer->ComputeFixedSize(GetFunction());
+unsigned FrameDescription::GetExpressionCount() {
+  ASSERT_EQ(StackFrame::JAVA_SCRIPT, type_);
+  unsigned size = GetFrameSize() - ComputeFixedSize();
   return size / kPointerSize;
 }
 
 
-Object* FrameDescription::GetExpression(Deoptimizer* deoptimizer, int index) {
-  ASSERT_EQ(Code::FUNCTION, kind_);
-  unsigned offset = GetOffsetFromSlotIndex(deoptimizer, index);
+Object* FrameDescription::GetExpression(int index) {
+  ASSERT_EQ(StackFrame::JAVA_SCRIPT, type_);
+  unsigned offset = GetOffsetFromSlotIndex(index);
   return reinterpret_cast<Object*>(*GetFrameSlotPointer(offset));
 }
 
@@ -1243,8 +1320,15 @@
 }
 
 
-void Translation::BeginFrame(int node_id, int literal_id, unsigned height) {
-  buffer_->Add(FRAME);
+void Translation::BeginArgumentsAdaptorFrame(int literal_id, unsigned height) {
+  buffer_->Add(ARGUMENTS_ADAPTOR_FRAME);
+  buffer_->Add(literal_id);
+  buffer_->Add(height);
+}
+
+
+void Translation::BeginJSFrame(int node_id, int literal_id, unsigned height) {
+  buffer_->Add(JS_FRAME);
   buffer_->Add(node_id);
   buffer_->Add(literal_id);
   buffer_->Add(height);
@@ -1308,7 +1392,6 @@
     case ARGUMENTS_OBJECT:
     case DUPLICATE:
       return 0;
-    case BEGIN:
     case REGISTER:
     case INT32_REGISTER:
     case DOUBLE_REGISTER:
@@ -1317,7 +1400,10 @@
     case DOUBLE_STACK_SLOT:
     case LITERAL:
       return 1;
-    case FRAME:
+    case BEGIN:
+    case ARGUMENTS_ADAPTOR_FRAME:
+      return 2;
+    case JS_FRAME:
       return 3;
   }
   UNREACHABLE();
@@ -1331,8 +1417,10 @@
   switch (opcode) {
     case BEGIN:
       return "BEGIN";
-    case FRAME:
-      return "FRAME";
+    case JS_FRAME:
+      return "JS_FRAME";
+    case ARGUMENTS_ADAPTOR_FRAME:
+      return "ARGUMENTS_ADAPTOR_FRAME";
     case REGISTER:
       return "REGISTER";
     case INT32_REGISTER:
@@ -1386,7 +1474,8 @@
 
   switch (opcode) {
     case Translation::BEGIN:
-    case Translation::FRAME:
+    case Translation::JS_FRAME:
+    case Translation::ARGUMENTS_ADAPTOR_FRAME:
       // Peeled off before getting here.
       break;
 
@@ -1432,9 +1521,27 @@
 }
 
 
-void SlotRef::ComputeSlotMappingForArguments(JavaScriptFrame* frame,
-                                             int inlined_frame_index,
-                                             Vector<SlotRef>* args_slots) {
+void SlotRef::ComputeSlotsForArguments(Vector<SlotRef>* args_slots,
+                                       TranslationIterator* it,
+                                       DeoptimizationInputData* data,
+                                       JavaScriptFrame* frame) {
+  // Process the translation commands for the arguments.
+
+  // Skip the translation command for the receiver.
+  it->Skip(Translation::NumberOfOperandsFor(
+      static_cast<Translation::Opcode>(it->Next())));
+
+  // Compute slots for arguments.
+  for (int i = 0; i < args_slots->length(); ++i) {
+    (*args_slots)[i] = ComputeSlotForNextArgument(it, data, frame);
+  }
+}
+
+
+Vector<SlotRef> SlotRef::ComputeSlotMappingForArguments(
+    JavaScriptFrame* frame,
+    int inlined_jsframe_index,
+    int formal_parameter_count) {
   AssertNoAllocation no_gc;
   int deopt_index = AstNode::kNoNumber;
   DeoptimizationInputData* data =
@@ -1443,51 +1550,73 @@
                          data->TranslationIndex(deopt_index)->value());
   Translation::Opcode opcode = static_cast<Translation::Opcode>(it.Next());
   ASSERT(opcode == Translation::BEGIN);
-  int frame_count = it.Next();
-  USE(frame_count);
-  ASSERT(frame_count > inlined_frame_index);
-  int frames_to_skip = inlined_frame_index;
+  it.Next();  // Drop frame count.
+  int jsframe_count = it.Next();
+  USE(jsframe_count);
+  ASSERT(jsframe_count > inlined_jsframe_index);
+  int jsframes_to_skip = inlined_jsframe_index;
   while (true) {
     opcode = static_cast<Translation::Opcode>(it.Next());
-    // Skip over operands to advance to the next opcode.
-    it.Skip(Translation::NumberOfOperandsFor(opcode));
-    if (opcode == Translation::FRAME) {
-      if (frames_to_skip == 0) {
+    if (opcode == Translation::ARGUMENTS_ADAPTOR_FRAME) {
+      if (jsframes_to_skip == 0) {
+        ASSERT(Translation::NumberOfOperandsFor(opcode) == 2);
+
+        it.Skip(1);  // literal id
+        int height = it.Next();
+
+        // We reached the arguments adaptor frame corresponding to the
+        // inlined function in question.  Number of arguments is height - 1.
+        Vector<SlotRef> args_slots =
+            Vector<SlotRef>::New(height - 1);  // Minus receiver.
+        ComputeSlotsForArguments(&args_slots, &it, data, frame);
+        return args_slots;
+      }
+    } else if (opcode == Translation::JS_FRAME) {
+      if (jsframes_to_skip == 0) {
+        // Skip over operands to advance to the next opcode.
+        it.Skip(Translation::NumberOfOperandsFor(opcode));
+
         // We reached the frame corresponding to the inlined function
         // in question.  Process the translation commands for the
-        // arguments.
-        //
-        // Skip the translation command for the receiver.
-        it.Skip(Translation::NumberOfOperandsFor(
-            static_cast<Translation::Opcode>(it.Next())));
-        // Compute slots for arguments.
-        for (int i = 0; i < args_slots->length(); ++i) {
-          (*args_slots)[i] = ComputeSlotForNextArgument(&it, data, frame);
-        }
-        return;
+        // arguments.  Number of arguments is equal to the number of
+        // format parameter count.
+        Vector<SlotRef> args_slots =
+            Vector<SlotRef>::New(formal_parameter_count);
+        ComputeSlotsForArguments(&args_slots, &it, data, frame);
+        return args_slots;
       }
-      frames_to_skip--;
+      jsframes_to_skip--;
     }
+
+    // Skip over operands to advance to the next opcode.
+    it.Skip(Translation::NumberOfOperandsFor(opcode));
   }
 
   UNREACHABLE();
+  return Vector<SlotRef>();
 }
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
 
 DeoptimizedFrameInfo::DeoptimizedFrameInfo(
-    Deoptimizer* deoptimizer, int frame_index) {
+    Deoptimizer* deoptimizer, int frame_index, bool has_arguments_adaptor) {
   FrameDescription* output_frame = deoptimizer->output_[frame_index];
   SetFunction(output_frame->GetFunction());
-  expression_count_ = output_frame->GetExpressionCount(deoptimizer);
+  expression_count_ = output_frame->GetExpressionCount();
+  expression_stack_ = new Object*[expression_count_];
+  for (int i = 0; i < expression_count_; i++) {
+    SetExpression(i, output_frame->GetExpression(i));
+  }
+
+  if (has_arguments_adaptor) {
+    output_frame = deoptimizer->output_[frame_index - 1];
+    ASSERT(output_frame->GetFrameType() == StackFrame::ARGUMENTS_ADAPTOR);
+  }
+
   parameters_count_ = output_frame->ComputeParametersCount();
   parameters_ = new Object*[parameters_count_];
   for (int i = 0; i < parameters_count_; i++) {
-    SetParameter(i, output_frame->GetParameter(deoptimizer, i));
-  }
-  expression_stack_ = new Object*[expression_count_];
-  for (int i = 0; i < expression_count_; i++) {
-    SetExpression(i, output_frame->GetExpression(deoptimizer, i));
+    SetParameter(i, output_frame->GetParameter(i));
   }
 }