Support for MIPS in architecture independent files....

src/mips/macro-assembler-mips.cc

+// Copyright 2006-2008 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
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+
+#include "v8.h"
+
+#include "bootstrapper.h"
+#include "codegen-inl.h"
+#include "debug.h"
+#include "runtime.h"
+
+namespace v8 {
+namespace internal {
+
+MacroAssembler::MacroAssembler(void* buffer, int size)
+    : Assembler(buffer, size),
+      unresolved_(0),
+      generating_stub_(false),
+      allow_stub_calls_(true),
+      code_object_(Heap::undefined_value()) {
+}
+
+
+
+void MacroAssembler::Jump(Register target, Condition cond, Register r1, const Operand& r2) {
+  jcond(Operand(target), cond, r1, r2);
+}
+
+
+void MacroAssembler::Jump(intptr_t target, RelocInfo::Mode rmode,
+                          Condition cond, Register r1, const Operand& r2) {
+  if(cond != cc_always) {
+    UNIMPLEMENTED();
+  }
+  // TO_UPGRADE: Use a JAL instead of JALR if the target is in the pc region and
+  // TO_UPGRADE: if the target does not need RelocInfo.
+  // Currently 'li' handles the cases when target need to be relocated.
+  li(t9, Operand(target, rmode));
+  jr(Operand(t9));
+  ASSERT(kCallTargetAddressOffset == 4 * kInstrSize);
+}
+
+
+void MacroAssembler::Jump(byte* target, RelocInfo::Mode rmode,
+                          Condition cond, Register r1, const Operand& r2) {
+  ASSERT(!RelocInfo::IsCodeTarget(rmode));
+  Jump(reinterpret_cast<intptr_t>(target), rmode, cond, r1, r2);
+}
+
+
+void MacroAssembler::Jump(Handle<Code> code, RelocInfo::Mode rmode,
+                          Condition cond, Register r1, const Operand& r2) {
+  ASSERT(RelocInfo::IsCodeTarget(rmode));
+  Jump(reinterpret_cast<intptr_t>(code.location()), rmode, cond);
+}
+
+
+void MacroAssembler::Call(Register target,
+                          Condition cond, Register r1, const Operand& r2) {
+  jalcond(Operand(target), cond, r1, r2);
+}
+
+
+void MacroAssembler::Call(intptr_t target, RelocInfo::Mode rmode,
+                          Condition cond, Register r1, const Operand& r2) {
+  if(cond != cc_always) {
+    UNIMPLEMENTED();
+  }
+  // TO_UPGRADE: Use a JAL instead of JALR if the target is in the pc region.
+  // TO_UPGRADE: Use jalcond with always. (not implemented when writing this)
+  // CAREFUL: Currently 'li' handles the cases when target need to be relocated.
+  li(t9, Operand(target, rmode));
+  jalr(Operand(t9));
+  // We assume the jump is the last instruction generated. Some function use the
+  // branch delay slots. (eg VirtualFrame::RawCallCodeObject)
+  ASSERT(kCallTargetAddressOffset == 4 * kInstrSize);
+}
+
+
+void MacroAssembler::Call(byte* target, RelocInfo::Mode rmode,
+                          Condition cond, Register r1, const Operand& r2) {
+  ASSERT(!RelocInfo::IsCodeTarget(rmode));
+  Call(reinterpret_cast<intptr_t>(target), rmode, cond, r1, r2);
+}
+
+
+void MacroAssembler::Call(Handle<Code> code, RelocInfo::Mode rmode,
+                          Condition cond, Register r1, const Operand& r2) {
+  ASSERT(RelocInfo::IsCodeTarget(rmode));
+  Call(reinterpret_cast<intptr_t>(code.location()), rmode, cond, r1, r2);
+}
+
+
+void MacroAssembler::Jump_was(Register target, Condition cond, Register r1, const Operand& r2) {
+  printf("Using Jump_was. Be sure to update the stack on return.");
+  jcond(Operand(target), cond, r1, r2);
+  addiu(sp, sp, -StandardFrameConstants::kRArgsSlotsSize);
+}
+
+
+void MacroAssembler::Jump_was(intptr_t target, RelocInfo::Mode rmode,
+                          Condition cond, Register r1, const Operand& r2) {
+  printf("Using Jump_was. Be sure to update the stack on return.");
+  if(cond != cc_always) {
+    UNIMPLEMENTED();
+  }
+  // TO_UPGRADE: Use a JAL instead of JALR if the target is in the pc region and
+  // TO_UPGRADE: if the target does not need RelocInfo.
+  // Currently 'li' handles the cases when target need to be relocated.
+  li(t9, Operand(target, rmode));
+  jr(Operand(t9));
+  addiu(sp, sp, -StandardFrameConstants::kRArgsSlotsSize);
+  ASSERT(kCallTargetAddressOffset == 4 * kInstrSize);
+}
+
+
+void MacroAssembler::Jump_was(byte* target, RelocInfo::Mode rmode,
+                          Condition cond, Register r1, const Operand& r2) {
+  ASSERT(!RelocInfo::IsCodeTarget(rmode));
+  Jump_was(reinterpret_cast<intptr_t>(target), rmode, cond, r1, r2);
+}
+
+
+void MacroAssembler::Jump_was(Handle<Code> code, RelocInfo::Mode rmode,
+                          Condition cond, Register r1, const Operand& r2) {
+  ASSERT(RelocInfo::IsCodeTarget(rmode));
+  Jump_was(reinterpret_cast<intptr_t>(code.location()), rmode, cond);
+}
+// Call with arguments slots.
+void MacroAssembler::Call_was(Register target,
+                          Condition cond, Register r1, const Operand& r2) {
+
+  jalcond(Operand(target), cond, r1, r2);
+  // Make space for arguments slots. We use the branch delay slot.
+  addiu(sp, sp, -StandardFrameConstants::kRArgsSlotsSize);
+  // On return we free arguments slots. We have to care that nothing is passed
+  // down on the stack.
+  addiu(sp, sp, StandardFrameConstants::kRArgsSlotsSize);
+}
+
+
+void MacroAssembler::Call_was(intptr_t target, RelocInfo::Mode rmode,
+                          Condition cond, Register r1, const Operand& r2) {
+  if(cond != cc_always) {
+    UNIMPLEMENTED();
+  }
+  // TO_UPGRADE: Use a JAL instead of JALR if the target is in the pc region.
+  // CAREFUL: Currently 'li' handles the cases when target need to be relocated.
+  li(t9, Operand(target, rmode));
+  jalr(Operand(t9));
+  addiu(sp, sp, -StandardFrameConstants::kRArgsSlotsSize);
+  addiu(sp, sp, StandardFrameConstants::kRArgsSlotsSize);
+  ASSERT(kCallTargetAddressOffset == 4 * kInstrSize);
+}
+
+
+void MacroAssembler::Call_was(byte* target, RelocInfo::Mode rmode,
+                          Condition cond, Register r1, const Operand& r2) {
+  ASSERT(!RelocInfo::IsCodeTarget(rmode));
+  Call_was(reinterpret_cast<intptr_t>(target), rmode, cond, r1, r2);
+}
+
+
+void MacroAssembler::Call_was(Handle<Code> code, RelocInfo::Mode rmode,
+                          Condition cond, Register r1, const Operand& r2) {
+  ASSERT(RelocInfo::IsCodeTarget(rmode));
+  Call_was(reinterpret_cast<intptr_t>(code.location()), rmode, cond, r1, r2);
+}
+
+
+void MacroAssembler::Ret(Condition cond, Register r1, const Operand& r2) {
+  jcond(Operand(ra), cond, r1, r2);
+}
+
+
+void MacroAssembler::SmiJumpTable(Register index, Vector<Label*> targets) {
+  UNIMPLEMENTED();
+//  // Empty the const pool.
+//  CheckConstPool(true, true);
+//  add(pc, pc, Operand(index,
+//                      LSL,
+//                      assembler::arm::Instr::kInstrSizeLog2 - kSmiTagSize));
+//  BlockConstPoolBefore(pc_offset() + (targets.length() + 1) * kInstrSize);
+//  nop();  // Jump table alignment.
+//  for (int i = 0; i < targets.length(); i++) {
+//    b(targets[i]);
+//  }
+}
+
+
+void MacroAssembler::LoadRoot(Register destination,
+                              Heap::RootListIndex index) {
+  lw(destination, MemOperand(s4, index << kPointerSizeLog2));
+}
+
+void MacroAssembler::LoadRoot(Register destination,
+                              Heap::RootListIndex index,
+                              Condition cond, Register src1, const Operand& src2) {
+  bcond( NegateCondition(cond), 2, src1, src2);
+  nop();
+  lw(destination, MemOperand(s4, index << kPointerSizeLog2));
+}
+
+
+// Will clobber 4 registers: object, offset, scratch, ip.  The
+// register 'object' contains a heap object pointer.  The heap object
+// tag is shifted away.
+void MacroAssembler::RecordWrite(Register object, Register offset,
+                                 Register scratch) {
+  UNIMPLEMENTED_();
+//  // This is how much we shift the remembered set bit offset to get the
+//  // offset of the word in the remembered set.  We divide by kBitsPerInt (32,
+//  // shift right 5) and then multiply by kIntSize (4, shift left 2).
+//  const int kRSetWordShift = 3;
+//
+//  Label fast, done;
+//
+//  // First, test that the object is not in the new space.  We cannot set
+//  // remembered set bits in the new space.
+//  // object: heap object pointer (with tag)
+//  // offset: offset to store location from the object
+////  and_(scratch, object, Operand(Heap::NewSpaceMask()));
+////  cmp(scratch, Operand(ExternalReference::new_space_start()));
+////  b(eq, &done);
+//  and_(scratch, object, Operand(Heap::NewSpaceMask()));
+//  bcond(eq, &done, scratch, Operand(ExternalReference::new_space_start()));
+//  nop();    // NOP_ADDED
+//
+//  // Compute the bit offset in the remembered set.
+//  // object: heap object pointer (with tag)
+//  // offset: offset to store location from the object
+////  mov(ip, Operand(Page::kPageAlignmentMask));  // load mask only once
+////  and_(scratch, object, Operand(ip));  // offset into page of the object
+////  add(offset, scratch, Operand(offset));  // add offset into the object
+////  mov(offset, Operand(offset, LSR, kObjectAlignmentBits));
+//  li(ip, Operand(Page::kPageAlignmentMask));    // load mask only once
+//  and_(scratch, object, Operand(ip));  // offset into page of the object
+//  addu(offset, scratch, Operand(offset));  // add offset into the object
+//  srl(offset, offset, kObjectAlignmentBits);
+//
+//  // Compute the page address from the heap object pointer.
+//  // object: heap object pointer (with tag)
+//  // offset: bit offset of store position in the remembered set
+////  bic(object, object, Operand(ip));
+//  andi(object, object, Operand(~Page::kPageAlignmentMask));
+//
+//  // If the bit offset lies beyond the normal remembered set range, it is in
+//  // the extra remembered set area of a large object.
+//  // object: page start
+//  // offset: bit offset of store position in the remembered set
+////  cmp(offset, Operand(Page::kPageSize / kPointerSize));
+////  b(lt, &fast);
+//  bcond(less, &fast, offset, Operand(Page::kPageSize / kPointerSize));
+//  nop(); // NOP_ADDED
+//
+//  // Adjust the bit offset to be relative to the start of the extra
+//  // remembered set and the start address to be the address of the extra
+//  // remembered set.
+////  sub(offset, offset, Operand(Page::kPageSize / kPointerSize));
+//  addiu(offset, offset, -1* Page::kPageSize / kPointerSize);
+//  // Load the array length into 'scratch' and multiply by four to get the
+//  // size in bytes of the elements.
+////  ldr(scratch, MemOperand(object, Page::kObjectStartOffset
+////                                  + FixedArray::kLengthOffset));
+////  mov(scratch, Operand(scratch, LSL, kObjectAlignmentBits));
+//  lw(scratch, MemOperand(object, Page::kObjectStartOffset
+//                                  + FixedArray::kLengthOffset));
+//  sll(scratch, scratch, kObjectAlignmentBits);
+//  // Add the page header (including remembered set), array header, and array
+//  // body size to the page address.
+//  addiu(object, object, Page::kObjectStartOffset + FixedArray::kHeaderSize);
+//  addu(object, object, scratch);
+//
+//  bind(&fast);
+//  // Get address of the rset word.
+//  // object: start of the remembered set (page start for the fast case)
+//  // offset: bit offset of store position in the remembered set
+////  bic(scratch, offset, Operand(kBitsPerInt - 1));  // clear the bit offset
+////  add(object, object, Operand(scratch, LSR, kRSetWordShift));
+//  andi(object, object, Operand(~(kBitsPerInt - 1)));
+//  sll(scratch, scratch, kRSetWordShift);
+//  addu(object, object, scratch);
+//  // Get bit offset in the rset word.
+//  // object: address of remembered set word
+//  // offset: bit offset of store position
+////  and_(offset, offset, Operand(kBitsPerInt - 1));
+//  and_(offset, offset, Operand(kBitsPerInt - 1));
+//
+////  ldr(scratch, MemOperand(object));
+////  mov(ip, Operand(1));
+////  orr(scratch, scratch, Operand(ip, LSL, offset));
+////  str(scratch, MemOperand(object));
+//  lw(scratch, MemOperand(object));
+//  li(ip, Operand(1));
+//  sllv(ip, ip, offset);
+//  or_(scratch, scratch, Operand(ip));
+//  sw(scratch, MemOperand(object));
+//
+//  bind(&done);
+}
+
+
+void MacroAssembler::EnterFrame(StackFrame::Type type) {
+  UNIMPLEMENTED_();
+//  addiu(sp, sp, Operand(-5 * kPointerSize));
+//  li(t0, Operand(Smi::FromInt(type)));
+//  li(t1, Operand(CodeObject()));
+//  sw(ra, MemOperand(sp, 4 * kPointerSize));
+//  sw(fp, MemOperand(sp, 3 * kPointerSize));
+//  sw(cp, MemOperand(sp, 2 * kPointerSize));
+//  sw(t0, MemOperand(sp, 1 * kPointerSize));
+//  sw(t1, MemOperand(sp, 0 * kPointerSize));
+//  addiu(fp, sp, Operand(3 * kPointerSize));
+}
+
+
+void MacroAssembler::LeaveFrame(StackFrame::Type type) {
+  UNIMPLEMENTED_();
+//  mov(sp, fp);
+//  lw(fp, MemOperand(sp, 0 * kPointerSize));
+//  lw(ra, MemOperand(sp, 1 * kPointerSize));
+//  addiu(sp, Operand(2 * kPointerSize));
+
+}
+
+
+void MacroAssembler::SetupAlignedCall(Register scratch, int arg_count) {
+  UNIMPLEMENTED_();
+//  push(s3);                        // Save s3 on the stack
+//  mov(s3, sp);                     // Save sp
+//  
+//  li(scratch, Operand(~7));        // Load sp mask
+//  and_(sp, sp, Operand(scratch));  // Align sp.
+//
+//    // We are going to push (arg_count + 0(2))*4 on the stack. We make sure sp will
+//    // be 8 bytes aligned after this.
+//  if( (arg_count % 2) != 0) {
+//    addiu(sp, sp, -4);
+//  }
+}
+
+void MacroAssembler::ReturnFromAlignedCall() {
+  UNIMPLEMENTED_();
+//  mov(sp, s3);      // Restore sp.
+//  pop(s3);          // Restore s3
+}
+
+
+void MacroAssembler::EnterExitFrame(ExitFrame::Mode mode) {
+  UNIMPLEMENTED_();
+//
+//  // Compute the argv pointer and keep it in a callee-saved register.
+//  // a0 is argc.
+//  sll(t0, a0, kPointerSizeLog2);
+//  add(s2, sp, t0);
+//  addi(s2, s2, Operand(-kPointerSize));
+//
+//  // Compute callee's stack pointer before making changes and save it as
+//  // ip register so that it is restored as sp register on exit, thereby
+//  // popping the args.
+//
+//  // ip = sp + kPointerSize * #args;
+//  add(ip, sp, t0);
+//
+//  // Align the stack at this point.  After this point we have 5 pushes,
+//  // so in fact we have to unalign here!  See also the assert on the
+//  // alignment immediately below.
+//  AlignStack(1);
+//
+//  // Save registers.
+//  // We save s3 as we sill need it to save sp in CEntryStub::GenerateCore.
+//  addiu(sp, sp, Operand(-16));
+//  sw(ip, MemOperand(sp, 12));
+//  sw(s3, MemOperand(sp,  8));
+//  sw(ra, MemOperand(sp,  4));
+//  sw(fp, MemOperand(sp,  0));
+//  mov(fp, sp);  // setup new frame pointer
+//
+//  // Push debug marker.
+//  if (mode == ExitFrame::MODE_DEBUG) {
+//    li(ip, Operand(Smi::FromInt(0)));
+//  } else {
+//    li(ip, Operand(CodeObject()));
+//  }
+//  push(ip);
+//
+//  // Save the frame pointer and the context in top.
+//  li(ip, Operand(ExternalReference(Top::k_c_entry_fp_address)));
+//  sw(fp, MemOperand(ip));
+//  li(ip, Operand(ExternalReference(Top::k_context_address)));   // CURRENT
+//  sw(cp, MemOperand(ip));
+//
+//  // Setup argc and the builtin function in callee-saved registers.
+//  mov(s0, a0);
+//  mov(s1, a1);
+//
+//
+//#ifdef ENABLE_DEBUGGER_SUPPORT
+//  // Save the state of all registers to the stack from the memory
+//  // location. This is needed to allow nested break points.
+////  if (mode == ExitFrame::MODE_DEBUG) {
+//    // Use sp as base to push.
+//    // ia32 seems to have a bug here. (Cf ia32 code TODO(1243899))
+////    CopyRegistersFromMemoryToStack(sp, kJSCallerSaved);
+////  }
+//#endif
+}
+
+
+void MacroAssembler::AlignStack(int offset) {
+  UNIMPLEMENTED_();
+//  int activation_frame_alignment = OS::ActivationFrameAlignment();
+//  if (activation_frame_alignment != kPointerSize) {
+//    // This code needs to be made more general if this assert doesn't hold.
+//    ASSERT(activation_frame_alignment == 2 * kPointerSize);
+//    li(t3, Operand(Smi::FromInt(0)));
+//    andi(t0, sp,  Operand(activation_frame_alignment - 1));
+//    push(t3, eq, t0, zero_reg );
+//  }
+}
+
+void MacroAssembler::LeaveExitFrame(ExitFrame::Mode mode) {
+  UNIMPLEMENTED_();
+//
+//#ifdef ENABLE_DEBUGGER_SUPPORT
+////  // Restore the memory copy of the registers by digging them out from
+////  // the stack. This is needed to allow nested break points.
+////  if (mode == ExitFrame::MODE_DEBUG) {
+////    // This code intentionally clobbers a2 and a3.
+////    const int kCallerSavedSize = kNumJSCallerSaved * kPointerSize;
+////    const int kOffset = ExitFrameConstants::kDebugMarkOffset - kCallerSavedSize;
+////    addi(a3, fp, Operand(kOffset));
+////    CopyRegistersFromStackToMemory(a3, a2, kJSCallerSaved);
+////  }
+//#endif
+//
+//  // Clear top frame.
+//  li(a3, Operand(0));
+//  li(ip, Operand(ExternalReference(Top::k_c_entry_fp_address)));
+//  sw(a3, MemOperand(ip));
+//
+//  // Restore current context from top and clear it in debug mode.
+//  li(ip, Operand(ExternalReference(Top::k_context_address)));
+//  lw(cp, MemOperand(ip));
+//#ifdef DEBUG
+//  sw(a3, MemOperand(ip));
+//#endif
+//
+//  // Pop the arguments, restore registers, and return.
+//  mov(sp, fp);  // respect ABI stack constraint
+//  lw(fp, MemOperand(sp,  0));
+//  lw(ra, MemOperand(sp,  4));
+//  lw(s3, MemOperand(sp,  8));
+//  lw(sp, MemOperand(sp, 12));
+//  jr(ra);
+//  nop();    // NOP_ADDED
+}
+
+
+void MacroAssembler::InvokePrologue(const ParameterCount& expected,
+                                    const ParameterCount& actual,
+                                    Handle<Code> code_constant,
+                                    Register code_reg,
+                                    Label* done,
+                                    InvokeFlag flag,
+                                    bool withArgsSlots) {
+  UNIMPLEMENTED_();
+
+//  bool definitely_matches = false;
+//  Label regular_invoke;
+//
+//  // Check whether the expected and actual arguments count match. If not,
+//  // setup registers according to contract with ArgumentsAdaptorTrampoline:
+//  //  r0: actual arguments count
+//  //  r1: function (passed through to callee)
+//  //  r2: expected arguments count
+//  //  r3: callee code entry
+//
+//  // The code below is made a lot easier because the calling code already sets
+//  // up actual and expected registers according to the contract if values are
+//  // passed in registers.
+//  ASSERT(actual.is_immediate() || actual.reg().is(a0));
+//  ASSERT(expected.is_immediate() || expected.reg().is(a2));
+//  ASSERT((!code_constant.is_null() && code_reg.is(no_reg)) || code_reg.is(a3));
+//
+//  if (expected.is_immediate()) {
+//    ASSERT(actual.is_immediate());
+//    if (expected.immediate() == actual.immediate()) {
+//      definitely_matches = true;
+//    } else {
+////      mov(r0, Operand(actual.immediate()));
+//      li(a0, Operand(actual.immediate()));
+//      const int sentinel = SharedFunctionInfo::kDontAdaptArgumentsSentinel;
+//      if (expected.immediate() == sentinel) {
+//        // Don't worry about adapting arguments for builtins that
+//        // don't want that done. Skip adaption code by making it look
+//        // like we have a match between expected and actual number of
+//        // arguments.
+//        definitely_matches = true;
+//      } else {
+////        mov(r2, Operand(expected.immediate()));
+//        li(a2, Operand(expected.immediate()));
+//      }
+//    }
+//  } else {
+//    if (actual.is_immediate()) {
+////      cmp(expected.reg(), Operand(actual.immediate()));
+////      b(eq, &regular_invoke);
+////      mov(r0, Operand(actual.immediate()));
+//      bcond(eq, &regular_invoke, expected.reg(), Operand(actual.immediate()));
+//      nop(); // NOP_ADDED
+//      li(a0, Operand(actual.immediate()));
+//    } else {
+////      cmp(expected.reg(), Operand(actual.reg()));
+////      b(eq, &regular_invoke);
+//      bcond(eq, &regular_invoke, expected.reg(), Operand(actual.reg()));
+//      nop();    // NOP_ADDED
+//    }
+//  }
+//
+//  if (!definitely_matches) {
+//    if (!code_constant.is_null()) {
+////      mov(r3, Operand(code_constant));
+////      add(r3, r3, Operand(Code::kHeaderSize - kHeapObjectTag));
+//      li(a3, Operand(code_constant));
+//      addiu(a3, a3, Operand(Code::kHeaderSize - kHeapObjectTag));
+//    }
+////
+//    Handle<Code> adaptor =
+//        Handle<Code>(Builtins::builtin(Builtins::ArgumentsAdaptorTrampoline));
+//    // We use v1 to tell the adaptor if we need args slots.
+//    if(withArgsSlots) {
+//      li(v1, Operand(0));
+//    } else {
+//      li(v1, Operand(1));
+//    }
+//    if (flag == CALL_FUNCTION) {
+//      Call(adaptor, RelocInfo::CODE_TARGET);
+//      nop(); // NOP_ADDED
+//      b(done);
+//      nop();    // NOP_ADDED
+//    } else {
+//      Jump(adaptor, RelocInfo::CODE_TARGET);
+//      nop();  // NOP_ADDED
+//    }
+//    bind(&regular_invoke);
+//  }
+}
+
+void MacroAssembler::InvokeCode(Register code,
+                                const ParameterCount& expected,
+                                const ParameterCount& actual,
+                                InvokeFlag flag,
+                                bool withArgsSlots) {
+  UNIMPLEMENTED_();
+
+//  Label done;
+//
+//  InvokePrologue(expected, actual, Handle<Code>::null(), code,
+//                      &done, flag, withArgsSlots);
+//  nop(); // NOP_ADDED
+//  if (flag == CALL_FUNCTION) {
+//    Call(code);
+//  } else {
+//    ASSERT(flag == JUMP_FUNCTION);
+//    Jump(code);
+//  }
+//
+//  // Because arguments slots may be needed and we need to ignore them in the
+//  // other case we allocate them here.
+//  if(withArgsSlots) {
+////    addiu(sp, sp, -StandardFrameConstants::kRArgsSlotsSize);
+//  } else {
+//    nop();
+//  }
+//
+//  // Continue here if InvokePrologue does handle the invocation due to
+//  // mismatched parameter counts.
+//  bind(&done);
+}
+
+
+void MacroAssembler::InvokeCode(Handle<Code> code,
+                                const ParameterCount& expected,
+                                const ParameterCount& actual,
+                                RelocInfo::Mode rmode,
+                                InvokeFlag flag,
+                                bool withArgsSlots) {
+  UNIMPLEMENTED_();
+//  Label done;
+//
+//  InvokePrologue(expected, actual, code, no_reg,
+//                      &done, flag, withArgsSlots);
+//  nop(); // NOP_ADDED
+//  if (flag == CALL_FUNCTION) {
+//    Call(code, rmode);
+//  } else {
+//    Jump(code, rmode);
+//  }
+//
+//  // Because arguments slots may be needed and we need to ignore them in the
+//  // other case we allocate them here.
+//  if(withArgsSlots) {
+////    addiu(sp, sp, -StandardFrameConstants::kRArgsSlotsSize);
+//  } else {
+//    nop();
+//  }
+//
+//  // Continue here if InvokePrologue does handle the invocation due to
+//  // mismatched parameter counts.
+//  bind(&done);
+}
+
+
+void MacroAssembler::InvokeFunction(Register fun,
+                                    const ParameterCount& actual,
+                                    InvokeFlag flag,
+                                    bool withArgsSlots) {
+  UNIMPLEMENTED_();
+//  // Contract with called JS functions requires that function is passed in a1.
+//  ASSERT(fun.is(a1));
+//
+//  Register expected_reg = a2;
+//  Register code_reg = a3;       // t9 ?
+//
+////  ldr(code_reg, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
+////  ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
+////  ldr(expected_reg,
+////      FieldMemOperand(code_reg,
+////                      SharedFunctionInfo::kFormalParameterCountOffset));
+////  ldr(code_reg,
+////      MemOperand(code_reg, SharedFunctionInfo::kCodeOffset - kHeapObjectTag));
+////  add(code_reg, code_reg, Operand(Code::kHeaderSize - kHeapObjectTag));
+//  lw(code_reg, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
+//  lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
+//  lw(expected_reg,
+//      FieldMemOperand(code_reg,
+//                      SharedFunctionInfo::kFormalParameterCountOffset));
+//  lw(code_reg,
+//      MemOperand(code_reg, SharedFunctionInfo::kCodeOffset - kHeapObjectTag));
+//  addiu(code_reg, code_reg, Operand(Code::kHeaderSize - kHeapObjectTag));
+//
+//  ParameterCount expected(expected_reg);
+//  InvokeCode(code_reg, expected, actual, flag, withArgsSlots);
+//  // We want the branch delay slot to be free.
+}
+
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+void MacroAssembler::SaveRegistersToMemory(RegList regs) {
+  UNIMPLEMENTED_();
+//  ASSERT((regs & ~kJSCallerSaved) == 0);
+//  // Copy the content of registers to memory location.
+//  for (int i = 0; i < kNumJSCallerSaved; i++) {
+//    int r = JSCallerSavedCode(i);
+//    if ((regs & (1 << r)) != 0) {
+//      Register reg = { r };
+////      mov(ip, Operand(ExternalReference(Debug_Address::Register(i))));
+////      str(reg, MemOperand(ip));
+//      li(ip, Operand(ExternalReference(Debug_Address::Register(i))));
+//      sw(reg, MemOperand(ip));
+//    }
+//  }
+}
+
+
+void MacroAssembler::RestoreRegistersFromMemory(RegList regs) {
+  UNIMPLEMENTED_();
+//  ASSERT((regs & ~kJSCallerSaved) == 0);
+//  // Copy the content of memory location to registers.
+//  for (int i = kNumJSCallerSaved; --i >= 0;) {
+//    int r = JSCallerSavedCode(i);
+//    if ((regs & (1 << r)) != 0) {
+//      Register reg = { r };
+////      mov(ip, Operand(ExternalReference(Debug_Address::Register(i))));
+////      ldr(reg, MemOperand(ip));
+//      li(ip, Operand(ExternalReference(Debug_Address::Register(i))));
+//      lw(reg, MemOperand(ip));
+//    }
+//  }
+}
+
+
+void MacroAssembler::CopyRegistersFromMemoryToStack(Register base,
+                                                    RegList regs) {
+  UNIMPLEMENTED_();
+//  ASSERT((regs & ~kJSCallerSaved) == 0);
+//  int16_t ActualNumSaved = 0;
+//  // Copy the content of the memory location to the stack and adjust base.
+//  for (int i = kNumJSCallerSaved; --i >= 0;) {
+//    int r = JSCallerSavedCode(i);
+//    if ((regs & (1 << r)) != 0) {
+////      mov(ip, Operand(ExternalReference(Debug_Address::Register(i))));
+////      ldr(ip, MemOperand(ip));
+////      str(ip, MemOperand(base, 4, NegPreIndex));
+//      li(ip, Operand(ExternalReference(Debug_Address::Register(i))));
+//      lw(ip, MemOperand(ip));
+//      sw(base, MemOperand(base, -4*(++ActualNumSaved) ));
+//    }
+//  }
+//  addi(base, Operand(-4*ActualNumSaved));
+}
+
+
+void MacroAssembler::CopyRegistersFromStackToMemory(Register base,
+                                                    Register scratch,
+                                                    RegList regs) {
+  UNIMPLEMENTED_();
+//  ASSERT((regs & ~kJSCallerSaved) == 0);
+//  int16_t ActualNumSaved = 0;
+//  // Copy the content of the stack to the memory location and adjust base.
+//  for (int i = 0; i < kNumJSCallerSaved; i++) {
+//    int r = JSCallerSavedCode(i);
+//    if ((regs & (1 << r)) != 0) {
+////      mov(ip, Operand(ExternalReference(Debug_Address::Register(i))));
+////      ldr(scratch, MemOperand(base, 4, PostIndex));
+////      str(scratch, MemOperand(ip));
+//      li(ip, Operand(ExternalReference(Debug_Address::Register(i))));
+//      lw(scratch, MemOperand(base, 4*(ActualNumSaved++) ));
+//      sw(scratch, MemOperand(ip));
+//    }
+//  }
+//  addi(base, Operand(4*ActualNumSaved));
+}
+#endif
+
+void MacroAssembler::PushTryHandler(CodeLocation try_location,
+                                    HandlerType type) {
+  UNIMPLEMENTED_();
+//  // Adjust this code if not the case.
+//  ASSERT(StackHandlerConstants::kSize == 4 * kPointerSize);
+//  // The pc (return address) is passed in register lr.
+//  if (try_location == IN_JAVASCRIPT) {
+//    if (type == TRY_CATCH_HANDLER) {
+//      li(t0, Operand(StackHandler::TRY_CATCH));
+//    } else {
+//      li(t0, Operand(StackHandler::TRY_FINALLY));
+//    }
+//    ASSERT(StackHandlerConstants::kStateOffset == 1 * kPointerSize
+//           && StackHandlerConstants::kFPOffset == 2 * kPointerSize
+//           && StackHandlerConstants::kPCOffset == 3 * kPointerSize
+//           && StackHandlerConstants::kNextOffset == 0 * kPointerSize);
+//
+//    // Save the current handler as the next handler.
+//    li(t2, Operand(ExternalReference(Top::k_handler_address)));
+//    lw(t1, MemOperand(t2));
+//    
+//    addiu(sp, sp, -StackHandlerConstants::kSize);
+//    sw(ra, MemOperand(sp, 12));
+//    sw(fp, MemOperand(sp, 8));
+//    sw(t0, MemOperand(sp, 4));
+//    sw(t1, MemOperand(sp, 0));
+//    
+//    // Link this handler as the new current one.
+//    sw(sp, MemOperand(t2));
+//
+//  } else {
+//    ASSERT(try_location == IN_JS_ENTRY);
+//    ASSERT(StackHandlerConstants::kStateOffset == 1 * kPointerSize
+//           && StackHandlerConstants::kFPOffset == 2 * kPointerSize
+//           && StackHandlerConstants::kPCOffset == 3 * kPointerSize
+//           && StackHandlerConstants::kNextOffset == 0 * kPointerSize);
+//
+//    // The frame pointer does not point to a JS frame so we save NULL
+//    // for fp. We expect the code throwing an exception to check fp
+//    // before dereferencing it to restore the context.
+//    li(t0, Operand(StackHandler::ENTRY));
+//
+//    // Save the current handler as the next handler.
+//    li(t2, Operand(ExternalReference(Top::k_handler_address)));
+//    lw(t1, MemOperand(t2));
+//
+//    // To optimize the code we don't use a multi_push like function.
+//    addiu(sp, sp, -StackHandlerConstants::kSize);
+//    sw(ra, MemOperand(sp, 12));
+//    sw(zero_reg, MemOperand(sp, 8));
+//    sw(t0, MemOperand(sp, 4));
+//    sw(t1, MemOperand(sp, 0));
+//
+//    // Link this handler as the new current one.
+//    sw(sp, MemOperand(t2));
+//  }
+}
+
+
+Register MacroAssembler::CheckMaps(JSObject* object, Register object_reg,
+                                   JSObject* holder, Register holder_reg,
+                                   Register scratch,
+                                   Label* miss) {
+  UNIMPLEMENTED_();
+//  // Make sure there's no overlap between scratch and the other
+//  // registers.
+//  ASSERT(!scratch.is(object_reg) && !scratch.is(holder_reg));
+//
+//  // Keep track of the current object in register reg.
+//  Register reg = object_reg;
+//  int depth = 1;
+//
+//  // Check the maps in the prototype chain.
+//  // Traverse the prototype chain from the object and do map checks.
+//  while (object != holder) {
+//    depth++;
+//
+//    // Only global objects and objects that do not require access
+//    // checks are allowed in stubs.
+//    ASSERT(object->IsJSGlobalProxy() || !object->IsAccessCheckNeeded());
+//
+//    // Get the map of the current object.
+////    ldr(scratch, FieldMemOperand(reg, HeapObject::kMapOffset));
+////    cmp(scratch, Operand(Handle<Map>(object->map())));
+//    lw(scratch, FieldMemOperand(reg, HeapObject::kMapOffset));
+//
+//    // Branch on the result of the map check.
+////    b(ne, miss);
+//    bcond(ne, miss, scratch, Operand(Handle<Map>(object->map())));
+//    nop();  // NOP_ADDED
+//
+//    // Check access rights to the global object.  This has to happen
+//    // after the map check so that we know that the object is
+//    // actually a global object.
+//    if (object->IsJSGlobalProxy()) {
+//      CheckAccessGlobalProxy(reg, scratch, miss);
+//      // Restore scratch register to be the map of the object.  In the
+//      // new space case below, we load the prototype from the map in
+//      // the scratch register.
+////      ldr(scratch, FieldMemOperand(reg, HeapObject::kMapOffset));
+//      lw(scratch, FieldMemOperand(reg, HeapObject::kMapOffset));
+//    }
+//
+//    reg = holder_reg;  // from now the object is in holder_reg
+//    JSObject* prototype = JSObject::cast(object->GetPrototype());
+//    if (Heap::InNewSpace(prototype)) {
+//      // The prototype is in new space; we cannot store a reference
+//      // to it in the code. Load it from the map.
+////      ldr(reg, FieldMemOperand(scratch, Map::kPrototypeOffset));
+//      lw(reg, FieldMemOperand(scratch, Map::kPrototypeOffset));
+//    } else {
+//      // The prototype is in old space; load it directly.
+////      mov(reg, Operand(Handle<JSObject>(prototype)));
+//      li(reg, Operand(Handle<JSObject>(prototype)));
+//    }
+//
+//    // Go to the next object in the prototype chain.
+//    object = prototype;
+//  }
+//
+//  // Check the holder map.
+////  ldr(scratch, FieldMemOperand(reg, HeapObject::kMapOffset));
+////  cmp(scratch, Operand(Handle<Map>(object->map())));
+////  b(ne, miss);
+//  lw(scratch, FieldMemOperand(reg, HeapObject::kMapOffset));
+//  bcond(ne, miss, scratch, Operand(Handle<Map>(object->map())));
+//  nop(); // NOP_ADDED
+//
+//  // Log the check depth.
+//  LOG(IntEvent("check-maps-depth", depth));
+//
+//  // Perform security check for access to the global object and return
+//  // the holder register.
+//  ASSERT(object == holder);
+//  ASSERT(object->IsJSGlobalProxy() || !object->IsAccessCheckNeeded());
+//  if (object->IsJSGlobalProxy()) {
+//    CheckAccessGlobalProxy(reg, scratch, miss);
+//  }
+//  return reg;
+  return at;    // UNIMPLEMENTED RETURN
+}
+
+
+void MacroAssembler::CheckAccessGlobalProxy(Register holder_reg,
+                                            Register scratch,
+                                            Label* miss) {
+  UNIMPLEMENTED_();
+//  Label same_contexts;
+//
+//  ASSERT(!holder_reg.is(scratch));
+//  ASSERT(!holder_reg.is(ip));
+//  ASSERT(!scratch.is(ip));
+//
+//  // Load current lexical context from the stack frame.
+////  ldr(scratch, MemOperand(fp, StandardFrameConstants::kContextOffset));
+//  lw(scratch, MemOperand(fp, StandardFrameConstants::kContextOffset));
+//  // In debug mode, make sure the lexical context is set.
+//#ifdef DEBUG
+////  cmp(scratch, Operand(0));
+//  Check(ne, "we should not have an empty lexical context", scratch, Operand(0));
+//#endif
+//
+//  // Load the global context of the current context.
+//  int offset = Context::kHeaderSize + Context::GLOBAL_INDEX * kPointerSize;
+////  ldr(scratch, FieldMemOperand(scratch, offset));
+////  ldr(scratch, FieldMemOperand(scratch, GlobalObject::kGlobalContextOffset));
+//  lw(scratch, FieldMemOperand(scratch, offset));
+//  lw(scratch, FieldMemOperand(scratch, GlobalObject::kGlobalContextOffset));
+//
+//  // Check the context is a global context.
+//  if (FLAG_debug_code) {
+//    // TODO(119): avoid push(holder_reg)/pop(holder_reg)
+//    // Cannot use ip as a temporary in this verification code. Due to the fact
+//    // that ip is clobbered as part of cmp with an object Operand.
+//    push(holder_reg);  // Temporarily save holder on the stack.
+//    // Read the first word and compare to the global_context_map.
+////    ldr(holder_reg, FieldMemOperand(scratch, HeapObject::kMapOffset));
+////    LoadRoot(ip, Heap::kGlobalContextMapRootIndex);
+////    cmp(holder_reg, ip);
+////    Check(eq, "JSGlobalObject::global_context should be a global context.");
+////    pop(holder_reg);  // Restore holder.
+//    lw(holder_reg, FieldMemOperand(scratch, HeapObject::kMapOffset));
+//    LoadRoot(ip, Heap::kGlobalContextMapRootIndex);
+//    Check(eq, "JSGlobalObject::global_context should be a global context.",
+//          holder_reg, Operand(ip));
+//    pop(holder_reg);  // Restore holder.
+//  }
+//
+//  // Check if both contexts are the same.
+////  ldr(ip, FieldMemOperand(holder_reg, JSGlobalProxy::kContextOffset));
+////  cmp(scratch, Operand(ip));
+////  b(eq, &same_contexts);
+//  lw(ip, FieldMemOperand(holder_reg, JSGlobalProxy::kContextOffset));
+//  bcond(eq, &same_contexts, scratch, Operand(ip));
+//  nop(); // NOP_ADDED
+//
+//  // Check the context is a global context.
+//  if (FLAG_debug_code) {
+//    // TODO(119): avoid push(holder_reg)/pop(holder_reg)
+//    // Cannot use ip as a temporary in this verification code. Due to the fact
+//    // that ip is clobbered as part of cmp with an object Operand.
+////    push(holder_reg);  // Temporarily save holder on the stack.
+////    mov(holder_reg, ip);  // Move ip to its holding place.
+////    LoadRoot(ip, Heap::kNullValueRootIndex);
+////    cmp(holder_reg, ip);
+////    Check(ne, "JSGlobalProxy::context() should not be null.");
+//    push(holder_reg);  // Temporarily save holder on the stack.
+//    mov(holder_reg, ip);  // Move ip to its holding place.
+//    LoadRoot(ip, Heap::kNullValueRootIndex);
+//    Check(ne, "JSGlobalProxy::context() should not be null.",
+//          holder_reg, Operand(ip));
+//
+////    ldr(holder_reg, FieldMemOperand(holder_reg, HeapObject::kMapOffset));
+////    LoadRoot(ip, Heap::kGlobalContextMapRootIndex);
+////    cmp(holder_reg, ip);
+////    Check(eq, "JSGlobalObject::global_context should be a global context.");
+//    lw(holder_reg, FieldMemOperand(holder_reg, HeapObject::kMapOffset));
+//    LoadRoot(ip, Heap::kGlobalContextMapRootIndex);
+//    Check(eq, "JSGlobalObject::global_context should be a global context.",
+//          holder_reg, Operand(ip));
+//    // Restore ip is not needed. ip is reloaded below.
+////    pop(holder_reg);  // Restore holder.
+//    pop(holder_reg);  // Restore holder.
+//    // Restore ip to holder's context.
+////    ldr(ip, FieldMemOperand(holder_reg, JSGlobalProxy::kContextOffset));
+//    lw(ip, FieldMemOperand(holder_reg, JSGlobalProxy::kContextOffset));
+//  }
+//
+//  // Check that the security token in the calling global object is
+//  // compatible with the security token in the receiving global
+//  // object.
+//  int token_offset = Context::kHeaderSize +
+//                     Context::SECURITY_TOKEN_INDEX * kPointerSize;
+//
+////  ldr(scratch, FieldMemOperand(scratch, token_offset));
+////  ldr(ip, FieldMemOperand(ip, token_offset));
+////  cmp(scratch, Operand(ip));
+////  b(ne, miss);
+//  lw(scratch, FieldMemOperand(scratch, token_offset));
+//  lw(ip, FieldMemOperand(ip, token_offset));
+//  bcond(ne, miss, scratch, Operand(ip));
+//  nop(); // NOP_ADDED
+//
+//  bind(&same_contexts);
+}
+
+
+void MacroAssembler::AllocateInNewSpace(int object_size,
+                                              Register result,
+                                              Register scratch1,
+                                              Register scratch2,
+                                              Label* gc_required,
+                                              AllocationFlags flags) {
+  UNIMPLEMENTED_();
+//  ASSERT(!result.is(scratch1));
+//  ASSERT(!scratch1.is(scratch2));
+//
+//  // Load address of new object into result and allocation top address into
+//  // scratch1.
+//  ExternalReference new_space_allocation_top =
+//      ExternalReference::new_space_allocation_top_address();
+//  li(scratch1, Operand(new_space_allocation_top));
+//  if ((flags & RESULT_CONTAINS_TOP) == 0) {
+//    lw(result, MemOperand(scratch1));
+//  } else {
+//#ifdef DEBUG
+//    // Assert that result actually contains top on entry. scratch2 is used
+//    // immediately below so this use of scratch2 does not cause difference with
+//    // respect to register content between debug and release mode.
+//    lw(scratch2, MemOperand(scratch1));
+//    Check(eq, "Unexpected allocation top", result, Operand(scratch2));
+//#endif
+//  }
+//
+//  // Calculate new top and bail out if new space is exhausted. Use result
+//  // to calculate the new top.
+//  ExternalReference new_space_allocation_limit =
+//      ExternalReference::new_space_allocation_limit_address();
+////  mov(scratch2, Operand(new_space_allocation_limit));
+////  ldr(scratch2, MemOperand(scratch2));
+////  add(result, result, Operand(object_size * kPointerSize));
+////  cmp(result, Operand(scratch2));
+////  b(hi, gc_required);
+//  li(scratch2, Operand(new_space_allocation_limit));
+//  lw(scratch2, MemOperand(scratch2));
+//  addiu(result, result, Operand(object_size * kPointerSize));
+//  bcond(Ugreater, gc_required, result, Operand(scratch2));
+//  nop(); // NOP_ADDED
+//
+//  // Update allocation top. result temporarily holds the new top,
+////  str(result, MemOperand(scratch1));
+//  sw(result, MemOperand(scratch1));
+//
+//  // Tag and adjust back to start of new object.
+//  if ((flags & TAG_OBJECT) != 0) {
+//    addiu(result, result, Operand(-(object_size * kPointerSize) +
+//                                kHeapObjectTag));
+//  } else {
+//    addiu(result, result, Operand(-object_size * kPointerSize));
+//  }
+}
+
+
+void MacroAssembler::AllocateInNewSpace(Register object_size,
+                                        Register result,
+                                        Register scratch1,
+                                        Register scratch2,
+                                        Label* gc_required,
+                                        AllocationFlags flags) {
+  UNIMPLEMENTED_();
+//  ASSERT(!result.is(scratch1));
+//  ASSERT(!scratch1.is(scratch2));
+//
+//  // Load address of new object into result and allocation top address into
+//  // scratch1.
+//  ExternalReference new_space_allocation_top =
+//      ExternalReference::new_space_allocation_top_address();
+////  mov(scratch1, Operand(new_space_allocation_top));
+//  li(scratch1, Operand(new_space_allocation_top));
+//  if ((flags & RESULT_CONTAINS_TOP) == 0) {
+////    ldr(result, MemOperand(scratch1));
+//    lw(result, MemOperand(scratch1));
+//  } else {
+//#ifdef DEBUG
+//    // Assert that result actually contains top on entry. scratch2 is used
+//    // immediately below so this use of scratch2 does not cause difference with
+//    // respect to register content between debug and release mode.
+////    ldr(scratch2, MemOperand(scratch1));
+////    cmp(result, scratch2);
+////    Check(eq, "Unexpected allocation top");
+//    lw(scratch2, MemOperand(scratch1));
+//    Check(eq, "Unexpected allocation top", result, Operand(scratch2));
+//#endif
+//  }
+//
+//  // Calculate new top and bail out if new space is exhausted. Use result
+//  // to calculate the new top. Object size is in words so a shift is required to
+//  // get the number of bytes
+//  ExternalReference new_space_allocation_limit =
+//      ExternalReference::new_space_allocation_limit_address();
+////  mov(scratch2, Operand(new_space_allocation_limit));
+////  ldr(scratch2, MemOperand(scratch2));
+////  add(result, result, Operand(object_size, LSL, kPointerSizeLog2));
+////  cmp(result, Operand(scratch2));
+////  b(hi, gc_required);
+//  li(scratch2, Operand(new_space_allocation_limit));
+//  lw(scratch2, MemOperand(scratch2));
+//  sll(ip, object_size, kPointerSizeLog2);
+//  addu(result, result, Operand(ip));
+//  bcond(Ugreater, gc_required, result, Operand(scratch2));
+//  nop(); // NOP_ADDED
+//
+//  // Update allocation top. result temporarily holds the new top,
+////  str(result, MemOperand(scratch1));
+//  sw(result, MemOperand(scratch1));
+//
+//  // Adjust back to start of new object.
+////  sub(result, result, Operand(object_size, LSL, kPointerSizeLog2));
+//  sub(result, result, Operand(ip));
+//
+//  // Tag object if requested.
+//  if ((flags & TAG_OBJECT) != 0) {
+////    add(result, result, Operand(kHeapObjectTag));
+//    addiu(result, result, Operand(kHeapObjectTag));
+//  }
+}
+
+
+void MacroAssembler::UndoAllocationInNewSpace(Register object,
+                                              Register scratch) {
+  UNIMPLEMENTED_();
+//  ExternalReference new_space_allocation_top =
+//      ExternalReference::new_space_allocation_top_address();
+//
+//  // Make sure the object has no tag before resetting top.
+//  andi(object, object, Operand(~kHeapObjectTagMask));
+//#ifdef DEBUG
+//  // Check that the object un-allocated is below the current top.
+////  mov(scratch, Operand(new_space_allocation_top));
+////  ldr(scratch, MemOperand(scratch));
+////  cmp(object, scratch);
+////  Check(lt, "Undo allocation of non allocated memory");
+//  li(scratch, Operand(new_space_allocation_top));
+//  lw(scratch, MemOperand(scratch));
+//  Check(less, "Undo allocation of non allocated memory", object, Operand(scratch));
+//#endif
+//  // Write the address of the object to un-allocate as the current top.
+//  li(scratch, Operand(new_space_allocation_top));
+//  sw(object, MemOperand(scratch));
+}
+
+
+void MacroAssembler::GetObjectType(Register function,
+                                    Register map,
+                                    Register type_reg) {
+  UNIMPLEMENTED_();
+//  lw(map, FieldMemOperand(function, HeapObject::kMapOffset));
+//  lbu(type_reg, FieldMemOperand(map, Map::kInstanceTypeOffset));
+}
+
+// REMOVED : code architecture does not fit MIPS. Use GetObjectType and bcond.
+//void MacroAssembler::CompareObjectType(Register function,
+//                                       Register map,
+//                                       Register type_reg,
+//                                       InstanceType type) {
+//  ldr(map, FieldMemOperand(function, HeapObject::kMapOffset));
+//  CompareInstanceType(map, type_reg, type);
+//}
+
+// REMOVED : code architecture does not fit MIPS. Use GetObjectType and bcond.
+//void MacroAssembler::CompareInstanceType(Register map,
+//                                         Register type_reg,
+//                                         InstanceType type) {
+//  ldrb(type_reg, FieldMemOperand(map, Map::kInstanceTypeOffset));
+//  cmp(type_reg, Operand(type));
+//}
+
+
+void MacroAssembler::TryGetFunctionPrototype(Register function,
+                                             Register result,
+                                             Register scratch,
+                                             Label* miss) {
+  UNIMPLEMENTED_();
+//  // Check that the receiver isn't a smi.
+//  BranchOnSmi(function, miss);
+//  nop(); // NOP_ADDED
+//
+//  // Check that the function really is a function.  Load map into result reg.
+////  CompareObjectType(function, result, scratch, JS_FUNCTION_TYPE);
+////  b(ne, miss);
+//  GetObjectType(function, result, scratch);
+//  bcond(ne, miss, scratch, Operand(JS_FUNCTION_TYPE));
+//  nop(); // NOP_ADDED
+//
+//  // Make sure that the function has an instance prototype.
+//  Label non_instance;
+////  ldrb(scratch, FieldMemOperand(result, Map::kBitFieldOffset));
+////  tst(scratch, Operand(1 << Map::kHasNonInstancePrototype));
+////  b(ne, &non_instance);
+//  lbu(scratch, FieldMemOperand(result, Map::kBitFieldOffset));
+//  andi(scratch, scratch, Operand(1 << Map::kHasNonInstancePrototype));
+//  bcond(ne, &non_instance, scratch, Operand(zero_reg));
+//  nop(); // NOP_ADDED
+//
+//  // Get the prototype or initial map from the function.
+////  ldr(result,
+////      FieldMemOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
+//  lw(result,
+//      FieldMemOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
+//
+//  // If the prototype or initial map is the hole, don't return it and
+//  // simply miss the cache instead. This will allow us to allocate a
+//  // prototype object on-demand in the runtime system.
+////  LoadRoot(ip, Heap::kTheHoleValueRootIndex);
+////  cmp(result, ip);
+////  b(eq, miss);
+//  LoadRoot(ip, Heap::kTheHoleValueRootIndex);
+//  bcond(eq, miss, result, Operand(ip));
+//  nop(); // NOP_ADDED
+//
+//  // If the function does not have an initial map, we're done.
+//  Label done;
+////  CompareObjectType(result, scratch, scratch, MAP_TYPE);
+////  b(ne, &done);
+//  GetObjectType(result, scratch, scratch);
+//  bcond(ne, &done, scratch, Operand(MAP_TYPE));
+//  nop(); // NOP_ADDED
+//
+//  // Get the prototype from the initial map.
+////  ldr(result, FieldMemOperand(result, Map::kPrototypeOffset));
+////  jmp(&done);
+//  lw(result, FieldMemOperand(result, Map::kPrototypeOffset));
+//  b(&done);
+//  nop(); // NOP_ADDED
+//
+//  // Non-instance prototype: Fetch prototype from constructor field
+//  // in initial map.
+////  bind(&non_instance);
+////  ldr(result, FieldMemOperand(result, Map::kConstructorOffset));
+//  bind(&non_instance);
+//  lw(result, FieldMemOperand(result, Map::kConstructorOffset));
+//
+//  // All done.
+//  bind(&done);
+}
+
+
+void MacroAssembler::CallStub(CodeStub* stub, Condition cond,
+                              Register r1, const Operand& r2) {
+  UNIMPLEMENTED_();
+//  ASSERT(allow_stub_calls());  // stub calls are not allowed in some stubs
+//  Call(stub->GetCode(), RelocInfo::CODE_TARGET, cond, r1, r2);
+}
+
+
+void MacroAssembler::StubReturn(int argc) {
+  UNIMPLEMENTED_();
+//  ASSERT(argc >= 1 && generating_stub());
+//  if (argc > 1)
+//    addiu(sp, sp, Operand((argc - 1) * kPointerSize));
+//  Ret();
+//  nop(); // NOP_ADDED
+}
+
+
+void MacroAssembler::IllegalOperation(int num_arguments) {
+  UNIMPLEMENTED();
+  break_(0x1232);
+//  if (num_arguments > 0) {
+////    add(sp, sp, Operand(num_arguments * kPointerSize));
+//    addiu(sp, sp, Operand(num_arguments * kPointerSize));
+//  }
+//  LoadRoot(v0, Heap::kUndefinedValueRootIndex);
+}
+
+
+void MacroAssembler::CallRuntime(Runtime::Function* f, int num_arguments) {
+  UNIMPLEMENTED_();
+//  // All parameters are on the stack.  r0->v0 has the return value after call.
+//
+//  // If the expected number of arguments of the runtime function is
+//  // constant, we check that the actual number of arguments match the
+//  // expectation.
+//  if (f->nargs >= 0 && f->nargs != num_arguments) {
+//    IllegalOperation(num_arguments);
+//    return;
+//  }
+//
+//  Runtime::FunctionId function_id =
+//      static_cast<Runtime::FunctionId>(f->stub_id);
+//  RuntimeStub stub(function_id, num_arguments);
+//  CallStub(&stub);
+}
+
+
+void MacroAssembler::CallRuntime(Runtime::FunctionId fid, int num_arguments) {
+  UNIMPLEMENTED_();
+//  CallRuntime(Runtime::FunctionForId(fid), num_arguments);
+}
+
+
+void MacroAssembler::TailCallRuntime(const ExternalReference& ext,
+                                     int num_arguments,
+                                     int result_size) {
+  UNIMPLEMENTED_();
+//  // ARM TODO
+//  // TODO(1236192): Most runtime routines don't need the number of
+//  // arguments passed in because it is constant. At some point we
+//  // should remove this need and make the runtime routine entry code
+//  // smarter.
+////  mov(r0, Operand(num_arguments));
+////  JumpToRuntime(ext);
+//  li(a0, Operand(num_arguments));
+//  JumpToRuntime(ext);
+//  nop(); // NOP_ADDED
+}
+
+
+void MacroAssembler::JumpToRuntime(const ExternalReference& builtin) {
+  UNIMPLEMENTED_();
+////#if defined(__thumb__)
+////  // Thumb mode builtin.
+////  ASSERT((reinterpret_cast<intptr_t>(builtin.address()) & 1) == 1);
+////#endif
+////  mov(r1, Operand(builtin));
+////  CEntryStub stub(1);
+////  Jump(stub.GetCode(), RelocInfo::CODE_TARGET);
+//  li(a1, Operand(builtin));
+//  CEntryStub stub(1);
+//  Jump(stub.GetCode(), RelocInfo::CODE_TARGET);
+}
+
+
+Handle<Code> MacroAssembler::ResolveBuiltin(Builtins::JavaScript id,
+                                            bool* resolved) {
+  UNIMPLEMENTED_();
+//  // Contract with compiled functions is that the function is passed in r1.
+//  int builtins_offset =
+//      JSBuiltinsObject::kJSBuiltinsOffset + (id * kPointerSize);
+////  ldr(r1, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
+////  ldr(r1, FieldMemOperand(r1, GlobalObject::kBuiltinsOffset));
+////  ldr(r1, FieldMemOperand(r1, builtins_offset));
+//  lw(a1, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
+//  lw(a1, FieldMemOperand(a1, GlobalObject::kBuiltinsOffset));
+//  lw(a1, FieldMemOperand(a1, builtins_offset));
+//
+//  return Builtins::GetCode(id, resolved);
+  return (Handle<Code>)((Code*)NULL);   // UNIMPLEMENTED RETURN
+}
+
+
+void MacroAssembler::InvokeBuiltin(Builtins::JavaScript id,
+                                   InvokeJSFlags flags) {
+  UNIMPLEMENTED_();
+//  bool resolved;
+//  Handle<Code> code = ResolveBuiltin(id, &resolved);
+//
+//  if (flags == CALL_JS) {
+//    Call(code, RelocInfo::CODE_TARGET);
+//  } else {
+//    ASSERT(flags == JUMP_JS);
+//    Jump(code, RelocInfo::CODE_TARGET);
+//  }
+////  addiu(sp, sp, -StandardFrameConstants::kRArgsSlotsSize);
+//  // Arguments slots are removed in GenCode after frame->Exit().
+////  addiu(sp, sp, StandardFrameConstants::kRArgsSlotsSize);
+//
+//  if (!resolved) {
+//    const char* name = Builtins::GetName(id);
+//    int argc = Builtins::GetArgumentsCount(id);
+//    uint32_t flags =
+//        Bootstrapper::FixupFlagsArgumentsCount::encode(argc) |
+//        Bootstrapper::FixupFlagsUseCodeObject::encode(false);
+//    Unresolved entry = { pc_offset() - kInstrSize, flags, name };
+//    unresolved_.Add(entry);
+//  }
+}
+
+
+void MacroAssembler::GetBuiltinEntry(Register target, Builtins::JavaScript id) {
+  UNIMPLEMENTED_();
+//  bool resolved;
+//  Handle<Code> code = ResolveBuiltin(id, &resolved);
+//
+////  mov(target, Operand(code));
+//  // We may need to patch this code, so we have li generate 2 instructions.
+//  li(target, Operand(code), true);
+//  if (!resolved) {
+//    const char* name = Builtins::GetName(id);
+//    int argc = Builtins::GetArgumentsCount(id);
+//    uint32_t flags =
+//        Bootstrapper::FixupFlagsArgumentsCount::encode(argc) |
+//        Bootstrapper::FixupFlagsUseCodeObject::encode(true);
+//    // li generated 2 instructions, so we need a -2*kInstrSize offset.
+//    Unresolved entry = { pc_offset() - 2*kInstrSize, flags, name };
+//    unresolved_.Add(entry);
+//  }
+//
+////  add(target, target, Operand(Code::kHeaderSize - kHeapObjectTag));
+//  addiu(target, target, Operand(Code::kHeaderSize - kHeapObjectTag));
+}
+
+
+void MacroAssembler::SetCounter(StatsCounter* counter, int value,
+                                Register scratch1, Register scratch2) {
+  UNIMPLEMENTED_();
+//  if (FLAG_native_code_counters && counter->Enabled()) {
+////    mov(scratch1, Operand(value));
+////    mov(scratch2, Operand(ExternalReference(counter)));
+////    str(scratch1, MemOperand(scratch2));
+//    li(scratch1, Operand(value));
+//    li(scratch2, Operand(ExternalReference(counter)));
+//    sw(scratch1, MemOperand(scratch2));
+//  }
+}
+
+
+void MacroAssembler::IncrementCounter(StatsCounter* counter, int value,
+                                      Register scratch1, Register scratch2) {
+  UNIMPLEMENTED_();
+//  ASSERT(value > 0);
+//  if (FLAG_native_code_counters && counter->Enabled()) {
+////    mov(scratch2, Operand(ExternalReference(counter)));
+////    ldr(scratch1, MemOperand(scratch2));
+////    add(scratch1, scratch1, Operand(value));
+////    str(scratch1, MemOperand(scratch2));
+//    li(scratch2, Operand(ExternalReference(counter)));
+//    lw(scratch1, MemOperand(scratch2));
+//    addiu(scratch1, scratch1, Operand(value));
+//    sw(scratch1, MemOperand(scratch2));
+//  }
+}
+
+
+void MacroAssembler::DecrementCounter(StatsCounter* counter, int value,
+                                      Register scratch1, Register scratch2) {
+  UNIMPLEMENTED_();
+//  ASSERT(value > 0);
+//  if (FLAG_native_code_counters && counter->Enabled()) {
+////    mov(scratch2, Operand(ExternalReference(counter)));
+////    ldr(scratch1, MemOperand(scratch2));
+////    sub(scratch1, scratch1, Operand(value));
+////    str(scratch1, MemOperand(scratch2));
+//    li(scratch2, Operand(ExternalReference(counter)));
+//    lw(scratch1, MemOperand(scratch2));
+//    addiu(scratch1, scratch1, Operand(-value));
+//    sw(scratch1, MemOperand(scratch2));
+//  }
+}
+
+
+
+void MacroAssembler::Assert(Condition cc, const char* msg, Register rs, Operand rt) {
+  UNIMPLEMENTED_();
+//  if (FLAG_debug_code)
+//    Check(cc, msg, rs, rt);
+}
+
+
+void MacroAssembler::Check(Condition cc, const char* msg, Register rs, Operand rt) {
+  UNIMPLEMENTED_();
+//  Label L;
+//  bcond(cc, &L, rs, rt);
+//  nop();
+//  Abort(msg);
+//  // will not return here
+//  bind(&L);
+}
+
+
+void MacroAssembler::Abort(const char* msg) {
+  UNIMPLEMENTED_();
+//  // We want to pass the msg string like a smi to avoid GC
+//  // problems, however msg is not guaranteed to be aligned
+//  // properly. Instead, we pass an aligned pointer that is
+//  // a proper v8 smi, but also pass the alignment difference
+////  // from the real pointer as a smi.
+//  intptr_t p1 = reinterpret_cast<intptr_t>(msg);
+//  intptr_t p0 = (p1 & ~kSmiTagMask) + kSmiTag;
+//  ASSERT(reinterpret_cast<Object*>(p0)->IsSmi());
+//#ifdef DEBUG
+//  if (msg != NULL) {
+//    RecordComment("Abort message: ");
+//    RecordComment(msg);
+//  }
+//#endif
+////  mov(r0, Operand(p0));
+////  push(r0);
+////  mov(r0, Operand(Smi::FromInt(p1 - p0)));
+////  push(r0);
+////  CallRuntime(Runtime::kAbort, 2);
+//  li(a0, Operand(p0));
+//  push(a0);
+//  li(a0, Operand(Smi::FromInt(p1 - p0)));
+//  push(a0);
+//  CallRuntime(Runtime::kAbort, 2);
+//  // will not return here
+}
+
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+CodePatcher::CodePatcher(byte* address, int instructions)
+    : address_(address),
+      instructions_(instructions),
+      size_(instructions * Assembler::kInstrSize),
+      masm_(address, size_ + Assembler::kGap) {
+  UNIMPLEMENTED_();
+  // Create a new macro assembler pointing to the address of the code to patch.
+  // The size is adjusted with kGap on order for the assembler to generate size
+  // bytes of instructions without failing with buffer size constraints.
+//  ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
+}
+
+
+CodePatcher::~CodePatcher() {
+  UNIMPLEMENTED_();
+//  // Indicate that code has changed.
+//  CPU::FlushICache(address_, size_);
+//
+//  // Check that the code was patched as expected.
+//  ASSERT(masm_.pc_ == address_ + size_);
+//  ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
+}
+
+
+void CodePatcher::Emit(Instr x) {
+  UNIMPLEMENTED_();
+//  masm()->emit(x);
+}
+
+
+void CodePatcher::Emit(Address addr) {
+  UNIMPLEMENTED_();
+//  masm()->emit(reinterpret_cast<Instr>(addr));
+}
+#endif  // ENABLE_DEBUGGER_SUPPORT
+
+
+} }  // namespace v8::internal