Remove some dead code.

src/arm/virtual-frame-arm.cc

Index: src/arm/virtual-frame-arm.cc
diff --git a/src/arm/virtual-frame-arm.cc b/src/arm/virtual-frame-arm.cc
deleted file mode 100644
index a852d6eedf0e093fd2015fac533c570e4840d191..0000000000000000000000000000000000000000
--- a/src/arm/virtual-frame-arm.cc
+++ /dev/null
@@ -1,843 +0,0 @@
-// Copyright 2009 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"
-
-#if defined(V8_TARGET_ARCH_ARM)
-
-#include "codegen-inl.h"
-#include "register-allocator-inl.h"
-#include "scopes.h"
-#include "virtual-frame-inl.h"
-
-namespace v8 {
-namespace internal {
-
-#define __ ACCESS_MASM(masm())
-
-void VirtualFrame::PopToR1R0() {
-  // Shuffle things around so the top of stack is in r0 and r1.
-  MergeTOSTo(R0_R1_TOS);
-  // Pop the two registers off the stack so they are detached from the frame.
-  LowerHeight(2);
-  top_of_stack_state_ = NO_TOS_REGISTERS;
-}
-
-
-void VirtualFrame::PopToR1() {
-  // Shuffle things around so the top of stack is only in r1.
-  MergeTOSTo(R1_TOS);
-  // Pop the register off the stack so it is detached from the frame.
-  LowerHeight(1);
-  top_of_stack_state_ = NO_TOS_REGISTERS;
-}
-
-
-void VirtualFrame::PopToR0() {
-  // Shuffle things around so the top of stack only in r0.
-  MergeTOSTo(R0_TOS);
-  // Pop the register off the stack so it is detached from the frame.
-  LowerHeight(1);
-  top_of_stack_state_ = NO_TOS_REGISTERS;
-}
-
-
-void VirtualFrame::MergeTo(const VirtualFrame* expected, Condition cond) {
-  if (Equals(expected)) return;
-  ASSERT((expected->tos_known_smi_map_ & tos_known_smi_map_) ==
-         expected->tos_known_smi_map_);
-  ASSERT(expected->IsCompatibleWith(this));
-  MergeTOSTo(expected->top_of_stack_state_, cond);
-  ASSERT(register_allocation_map_ == expected->register_allocation_map_);
-}
-
-
-void VirtualFrame::MergeTo(VirtualFrame* expected, Condition cond) {
-  if (Equals(expected)) return;
-  tos_known_smi_map_ &= expected->tos_known_smi_map_;
-  MergeTOSTo(expected->top_of_stack_state_, cond);
-  ASSERT(register_allocation_map_ == expected->register_allocation_map_);
-}
-
-
-void VirtualFrame::MergeTOSTo(
-    VirtualFrame::TopOfStack expected_top_of_stack_state, Condition cond) {
-#define CASE_NUMBER(a, b) ((a) * TOS_STATES + (b))
-  switch (CASE_NUMBER(top_of_stack_state_, expected_top_of_stack_state)) {
-    case CASE_NUMBER(NO_TOS_REGISTERS, NO_TOS_REGISTERS):
-      break;
-    case CASE_NUMBER(NO_TOS_REGISTERS, R0_TOS):
-      __ pop(r0, cond);
-      break;
-    case CASE_NUMBER(NO_TOS_REGISTERS, R1_TOS):
-      __ pop(r1, cond);
-      break;
-    case CASE_NUMBER(NO_TOS_REGISTERS, R0_R1_TOS):
-      __ pop(r0, cond);
-      __ pop(r1, cond);
-      break;
-    case CASE_NUMBER(NO_TOS_REGISTERS, R1_R0_TOS):
-      __ pop(r1, cond);
-      __ pop(r0, cond);
-      break;
-    case CASE_NUMBER(R0_TOS, NO_TOS_REGISTERS):
-      __ push(r0, cond);
-      break;
-    case CASE_NUMBER(R0_TOS, R0_TOS):
-      break;
-    case CASE_NUMBER(R0_TOS, R1_TOS):
-      __ mov(r1, r0, LeaveCC, cond);
-      break;
-    case CASE_NUMBER(R0_TOS, R0_R1_TOS):
-      __ pop(r1, cond);
-      break;
-    case CASE_NUMBER(R0_TOS, R1_R0_TOS):
-      __ mov(r1, r0, LeaveCC, cond);
-      __ pop(r0, cond);
-      break;
-    case CASE_NUMBER(R1_TOS, NO_TOS_REGISTERS):
-      __ push(r1, cond);
-      break;
-    case CASE_NUMBER(R1_TOS, R0_TOS):
-      __ mov(r0, r1, LeaveCC, cond);
-      break;
-    case CASE_NUMBER(R1_TOS, R1_TOS):
-      break;
-    case CASE_NUMBER(R1_TOS, R0_R1_TOS):
-      __ mov(r0, r1, LeaveCC, cond);
-      __ pop(r1, cond);
-      break;
-    case CASE_NUMBER(R1_TOS, R1_R0_TOS):
-      __ pop(r0, cond);
-      break;
-    case CASE_NUMBER(R0_R1_TOS, NO_TOS_REGISTERS):
-      __ Push(r1, r0, cond);
-      break;
-    case CASE_NUMBER(R0_R1_TOS, R0_TOS):
-      __ push(r1, cond);
-      break;
-    case CASE_NUMBER(R0_R1_TOS, R1_TOS):
-      __ push(r1, cond);
-      __ mov(r1, r0, LeaveCC, cond);
-      break;
-    case CASE_NUMBER(R0_R1_TOS, R0_R1_TOS):
-      break;
-    case CASE_NUMBER(R0_R1_TOS, R1_R0_TOS):
-      __ Swap(r0, r1, ip, cond);
-      break;
-    case CASE_NUMBER(R1_R0_TOS, NO_TOS_REGISTERS):
-      __ Push(r0, r1, cond);
-      break;
-    case CASE_NUMBER(R1_R0_TOS, R0_TOS):
-      __ push(r0, cond);
-      __ mov(r0, r1, LeaveCC, cond);
-      break;
-    case CASE_NUMBER(R1_R0_TOS, R1_TOS):
-      __ push(r0, cond);
-      break;
-    case CASE_NUMBER(R1_R0_TOS, R0_R1_TOS):
-      __ Swap(r0, r1, ip, cond);
-      break;
-    case CASE_NUMBER(R1_R0_TOS, R1_R0_TOS):
-      break;
-    default:
-      UNREACHABLE();
-#undef CASE_NUMBER
-  }
-  // A conditional merge will be followed by a conditional branch and the
-  // fall-through code will have an unchanged virtual frame state.  If the
-  // merge is unconditional ('al'ways) then it might be followed by a fall
-  // through.  We need to update the virtual frame state to match the code we
-  // are falling into.  The final case is an unconditional merge followed by an
-  // unconditional branch, in which case it doesn't matter what we do to the
-  // virtual frame state, because the virtual frame will be invalidated.
-  if (cond == al) {
-    top_of_stack_state_ = expected_top_of_stack_state;
-  }
-}
-
-
-void VirtualFrame::Enter() {
-  Comment cmnt(masm(), "[ Enter JS frame");
-
-#ifdef DEBUG
-  // Verify that r1 contains a JS function.  The following code relies
-  // on r2 being available for use.
-  if (FLAG_debug_code) {
-    Label map_check, done;
-    __ tst(r1, Operand(kSmiTagMask));
-    __ b(ne, &map_check);
-    __ stop("VirtualFrame::Enter - r1 is not a function (smi check).");
-    __ bind(&map_check);
-    __ CompareObjectType(r1, r2, r2, JS_FUNCTION_TYPE);
-    __ b(eq, &done);
-    __ stop("VirtualFrame::Enter - r1 is not a function (map check).");
-    __ bind(&done);
-  }
-#endif  // DEBUG
-
-  // We are about to push four values to the frame.
-  Adjust(4);
-  __ stm(db_w, sp, r1.bit() | cp.bit() | fp.bit() | lr.bit());
-  // Adjust FP to point to saved FP.
-  __ add(fp, sp, Operand(2 * kPointerSize));
-}
-
-
-void VirtualFrame::Exit() {
-  Comment cmnt(masm(), "[ Exit JS frame");
-  // Record the location of the JS exit code for patching when setting
-  // break point.
-  __ RecordJSReturn();
-
-  // Drop the execution stack down to the frame pointer and restore the caller
-  // frame pointer and return address.
-  __ mov(sp, fp);
-  __ ldm(ia_w, sp, fp.bit() | lr.bit());
-}
-
-
-void VirtualFrame::AllocateStackSlots() {
-  int count = local_count();
-  if (count > 0) {
-    Comment cmnt(masm(), "[ Allocate space for locals");
-    Adjust(count);
-    // Initialize stack slots with 'undefined' value.
-    __ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
-    __ LoadRoot(r2, Heap::kStackLimitRootIndex);
-    if (count < kLocalVarBound) {
-      // For less locals the unrolled loop is more compact.
-      for (int i = 0; i < count; i++) {
-        __ push(ip);
-      }
-    } else {
-      // For more locals a loop in generated code is more compact.
-      Label alloc_locals_loop;
-      __ mov(r1, Operand(count));
-      __ bind(&alloc_locals_loop);
-      __ push(ip);
-      __ sub(r1, r1, Operand(1), SetCC);
-      __ b(ne, &alloc_locals_loop);
-    }
-  } else {
-    __ LoadRoot(r2, Heap::kStackLimitRootIndex);
-  }
-  // Check the stack for overflow or a break request.
-  masm()->cmp(sp, Operand(r2));
-  StackCheckStub stub;
-  // Call the stub if lower.
-  masm()->mov(ip,
-              Operand(reinterpret_cast<intptr_t>(stub.GetCode().location()),
-                      RelocInfo::CODE_TARGET),
-              LeaveCC,
-              lo);
-  masm()->Call(ip, lo);
-}
-
-
-
-void VirtualFrame::PushReceiverSlotAddress() {
-  UNIMPLEMENTED();
-}
-
-
-void VirtualFrame::PushTryHandler(HandlerType type) {
-  // Grow the expression stack by handler size less one (the return
-  // address in lr is already counted by a call instruction).
-  Adjust(kHandlerSize - 1);
-  __ PushTryHandler(IN_JAVASCRIPT, type);
-}
-
-
-void VirtualFrame::CallJSFunction(int arg_count) {
-  // InvokeFunction requires function in r1.
-  PopToR1();
-  SpillAll();
-
-  // +1 for receiver.
-  Forget(arg_count + 1);
-  ASSERT(cgen()->HasValidEntryRegisters());
-  ParameterCount count(arg_count);
-  __ InvokeFunction(r1, count, CALL_FUNCTION);
-  // Restore the context.
-  __ ldr(cp, Context());
-}
-
-
-void VirtualFrame::CallRuntime(const Runtime::Function* f, int arg_count) {
-  SpillAll();
-  Forget(arg_count);
-  ASSERT(cgen()->HasValidEntryRegisters());
-  __ CallRuntime(f, arg_count);
-}
-
-
-void VirtualFrame::CallRuntime(Runtime::FunctionId id, int arg_count) {
-  SpillAll();
-  Forget(arg_count);
-  ASSERT(cgen()->HasValidEntryRegisters());
-  __ CallRuntime(id, arg_count);
-}
-
-
-#ifdef ENABLE_DEBUGGER_SUPPORT
-void VirtualFrame::DebugBreak() {
-  ASSERT(cgen()->HasValidEntryRegisters());
-  __ DebugBreak();
-}
-#endif
-
-
-void VirtualFrame::InvokeBuiltin(Builtins::JavaScript id,
-                                 InvokeJSFlags flags,
-                                 int arg_count) {
-  Forget(arg_count);
-  __ InvokeBuiltin(id, flags);
-}
-
-
-void VirtualFrame::CallLoadIC(Handle<String> name, RelocInfo::Mode mode) {
-  Handle<Code> ic(Isolate::Current()->builtins()->builtin(
-      Builtins::kLoadIC_Initialize));
-  PopToR0();
-  SpillAll();
-  __ mov(r2, Operand(name));
-  CallCodeObject(ic, mode, 0);
-}
-
-
-void VirtualFrame::CallStoreIC(Handle<String> name,
-                               bool is_contextual,
-                               StrictModeFlag strict_mode) {
-  Handle<Code> ic(Isolate::Current()->builtins()->builtin(
-      (strict_mode == kStrictMode) ? Builtins::kStoreIC_Initialize_Strict
-                                   : Builtins::kStoreIC_Initialize));
-  PopToR0();
-  RelocInfo::Mode mode;
-  if (is_contextual) {
-    SpillAll();
-    __ ldr(r1, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
-    mode = RelocInfo::CODE_TARGET_CONTEXT;
-  } else {
-    EmitPop(r1);
-    SpillAll();
-    mode = RelocInfo::CODE_TARGET;
-  }
-  __ mov(r2, Operand(name));
-  CallCodeObject(ic, mode, 0);
-}
-
-
-void VirtualFrame::CallKeyedLoadIC() {
-  Handle<Code> ic(Isolate::Current()->builtins()->builtin(
-      Builtins::kKeyedLoadIC_Initialize));
-  PopToR1R0();
-  SpillAll();
-  CallCodeObject(ic, RelocInfo::CODE_TARGET, 0);
-}
-
-
-void VirtualFrame::CallKeyedStoreIC(StrictModeFlag strict_mode) {
-  Handle<Code> ic(Isolate::Current()->builtins()->builtin(
-      (strict_mode == kStrictMode) ? Builtins::kKeyedStoreIC_Initialize_Strict
-                                   : Builtins::kKeyedStoreIC_Initialize));
-  PopToR1R0();
-  SpillAll();
-  EmitPop(r2);
-  CallCodeObject(ic, RelocInfo::CODE_TARGET, 0);
-}
-
-
-void VirtualFrame::CallCodeObject(Handle<Code> code,
-                                  RelocInfo::Mode rmode,
-                                  int dropped_args) {
-  switch (code->kind()) {
-    case Code::CALL_IC:
-    case Code::KEYED_CALL_IC:
-    case Code::FUNCTION:
-      break;
-    case Code::KEYED_LOAD_IC:
-    case Code::LOAD_IC:
-    case Code::KEYED_STORE_IC:
-    case Code::STORE_IC:
-      ASSERT(dropped_args == 0);
-      break;
-    case Code::BUILTIN:
-      ASSERT(*code == Isolate::Current()->builtins()->builtin(
-          Builtins::kJSConstructCall));
-      break;
-    default:
-      UNREACHABLE();
-      break;
-  }
-  Forget(dropped_args);
-  ASSERT(cgen()->HasValidEntryRegisters());
-  __ Call(code, rmode);
-}
-
-
-//    NO_TOS_REGISTERS, R0_TOS, R1_TOS, R1_R0_TOS, R0_R1_TOS.
-const bool VirtualFrame::kR0InUse[TOS_STATES] =
-    { false,            true,   false,  true,      true };
-const bool VirtualFrame::kR1InUse[TOS_STATES] =
-    { false,            false,  true,   true,      true };
-const int VirtualFrame::kVirtualElements[TOS_STATES] =
-    { 0,                1,      1,      2,         2 };
-const Register VirtualFrame::kTopRegister[TOS_STATES] =
-    { r0,               r0,     r1,     r1,        r0 };
-const Register VirtualFrame::kBottomRegister[TOS_STATES] =
-    { r0,               r0,     r1,     r0,        r1 };
-const Register VirtualFrame::kAllocatedRegisters[
-    VirtualFrame::kNumberOfAllocatedRegisters] = { r2, r3, r4, r5, r6 };
-// Popping is done by the transition implied by kStateAfterPop.  Of course if
-// there were no stack slots allocated to registers then the physical SP must
-// be adjusted.
-const VirtualFrame::TopOfStack VirtualFrame::kStateAfterPop[TOS_STATES] =
-    { NO_TOS_REGISTERS, NO_TOS_REGISTERS, NO_TOS_REGISTERS, R0_TOS, R1_TOS };
-// Pushing is done by the transition implied by kStateAfterPush.  Of course if
-// the maximum number of registers was already allocated to the top of stack
-// slots then one register must be physically pushed onto the stack.
-const VirtualFrame::TopOfStack VirtualFrame::kStateAfterPush[TOS_STATES] =
-    { R0_TOS, R1_R0_TOS, R0_R1_TOS, R0_R1_TOS, R1_R0_TOS };
-
-
-void VirtualFrame::Drop(int count) {
-  ASSERT(count >= 0);
-  ASSERT(height() >= count);
-  // Discard elements from the virtual frame and free any registers.
-  int num_virtual_elements = kVirtualElements[top_of_stack_state_];
-  while (num_virtual_elements > 0) {
-    Pop();
-    num_virtual_elements--;
-    count--;
-    if (count == 0) return;
-  }
-  if (count == 0) return;
-  __ add(sp, sp, Operand(count * kPointerSize));
-  LowerHeight(count);
-}
-
-
-void VirtualFrame::Pop() {
-  if (top_of_stack_state_ == NO_TOS_REGISTERS) {
-    __ add(sp, sp, Operand(kPointerSize));
-  } else {
-    top_of_stack_state_ = kStateAfterPop[top_of_stack_state_];
-  }
-  LowerHeight(1);
-}
-
-
-void VirtualFrame::EmitPop(Register reg) {
-  ASSERT(!is_used(RegisterAllocator::ToNumber(reg)));
-  if (top_of_stack_state_ == NO_TOS_REGISTERS) {
-    __ pop(reg);
-  } else {
-    __ mov(reg, kTopRegister[top_of_stack_state_]);
-    top_of_stack_state_ = kStateAfterPop[top_of_stack_state_];
-  }
-  LowerHeight(1);
-}
-
-
-void VirtualFrame::SpillAllButCopyTOSToR0() {
-  switch (top_of_stack_state_) {
-    case NO_TOS_REGISTERS:
-      __ ldr(r0, MemOperand(sp, 0));
-      break;
-    case R0_TOS:
-      __ push(r0);
-      break;
-    case R1_TOS:
-      __ push(r1);
-      __ mov(r0, r1);
-      break;
-    case R0_R1_TOS:
-      __ Push(r1, r0);
-      break;
-    case R1_R0_TOS:
-      __ Push(r0, r1);
-      __ mov(r0, r1);
-      break;
-    default:
-      UNREACHABLE();
-  }
-  top_of_stack_state_ = NO_TOS_REGISTERS;
-}
-
-
-void VirtualFrame::SpillAllButCopyTOSToR1() {
-  switch (top_of_stack_state_) {
-    case NO_TOS_REGISTERS:
-      __ ldr(r1, MemOperand(sp, 0));
-      break;
-    case R0_TOS:
-      __ push(r0);
-      __ mov(r1, r0);
-      break;
-    case R1_TOS:
-      __ push(r1);
-      break;
-    case R0_R1_TOS:
-      __ Push(r1, r0);
-      __ mov(r1, r0);
-      break;
-    case R1_R0_TOS:
-      __ Push(r0, r1);
-      break;
-    default:
-      UNREACHABLE();
-  }
-  top_of_stack_state_ = NO_TOS_REGISTERS;
-}
-
-
-void VirtualFrame::SpillAllButCopyTOSToR1R0() {
-  switch (top_of_stack_state_) {
-    case NO_TOS_REGISTERS:
-      __ ldr(r1, MemOperand(sp, 0));
-      __ ldr(r0, MemOperand(sp, kPointerSize));
-      break;
-    case R0_TOS:
-      __ push(r0);
-      __ mov(r1, r0);
-      __ ldr(r0, MemOperand(sp, kPointerSize));
-      break;
-    case R1_TOS:
-      __ push(r1);
-      __ ldr(r0, MemOperand(sp, kPointerSize));
-      break;
-    case R0_R1_TOS:
-      __ Push(r1, r0);
-      __ Swap(r0, r1, ip);
-      break;
-    case R1_R0_TOS:
-      __ Push(r0, r1);
-      break;
-    default:
-      UNREACHABLE();
-  }
-  top_of_stack_state_ = NO_TOS_REGISTERS;
-}
-
-
-Register VirtualFrame::Peek() {
-  AssertIsNotSpilled();
-  if (top_of_stack_state_ == NO_TOS_REGISTERS) {
-    top_of_stack_state_ = kStateAfterPush[top_of_stack_state_];
-    Register answer = kTopRegister[top_of_stack_state_];
-    __ pop(answer);
-    return answer;
-  } else {
-    return kTopRegister[top_of_stack_state_];
-  }
-}
-
-
-Register VirtualFrame::Peek2() {
-  AssertIsNotSpilled();
-  switch (top_of_stack_state_) {
-    case NO_TOS_REGISTERS:
-    case R0_TOS:
-    case R0_R1_TOS:
-      MergeTOSTo(R0_R1_TOS);
-      return r1;
-    case R1_TOS:
-    case R1_R0_TOS:
-      MergeTOSTo(R1_R0_TOS);
-      return r0;
-    default:
-      UNREACHABLE();
-      return no_reg;
-  }
-}
-
-
-void VirtualFrame::Dup() {
-  if (SpilledScope::is_spilled()) {
-    __ ldr(ip, MemOperand(sp, 0));
-    __ push(ip);
-  } else {
-    switch (top_of_stack_state_) {
-      case NO_TOS_REGISTERS:
-        __ ldr(r0, MemOperand(sp, 0));
-        top_of_stack_state_ = R0_TOS;
-        break;
-      case R0_TOS:
-        __ mov(r1, r0);
-        // r0 and r1 contains the same value. Prefer state with r0 holding TOS.
-        top_of_stack_state_ = R0_R1_TOS;
-        break;
-      case R1_TOS:
-        __ mov(r0, r1);
-        // r0 and r1 contains the same value. Prefer state with r0 holding TOS.
-        top_of_stack_state_ = R0_R1_TOS;
-        break;
-      case R0_R1_TOS:
-        __ push(r1);
-        __ mov(r1, r0);
-        // r0 and r1 contains the same value. Prefer state with r0 holding TOS.
-        top_of_stack_state_ = R0_R1_TOS;
-        break;
-      case R1_R0_TOS:
-        __ push(r0);
-        __ mov(r0, r1);
-        // r0 and r1 contains the same value. Prefer state with r0 holding TOS.
-        top_of_stack_state_ = R0_R1_TOS;
-        break;
-      default:
-        UNREACHABLE();
-    }
-  }
-  RaiseHeight(1, tos_known_smi_map_ & 1);
-}
-
-
-void VirtualFrame::Dup2() {
-  if (SpilledScope::is_spilled()) {
-    __ ldr(ip, MemOperand(sp, kPointerSize));
-    __ push(ip);
-    __ ldr(ip, MemOperand(sp, kPointerSize));
-    __ push(ip);
-  } else {
-    switch (top_of_stack_state_) {
-      case NO_TOS_REGISTERS:
-        __ ldr(r0, MemOperand(sp, 0));
-        __ ldr(r1, MemOperand(sp, kPointerSize));
-        top_of_stack_state_ = R0_R1_TOS;
-        break;
-      case R0_TOS:
-        __ push(r0);
-        __ ldr(r1, MemOperand(sp, kPointerSize));
-        top_of_stack_state_ = R0_R1_TOS;
-        break;
-      case R1_TOS:
-        __ push(r1);
-        __ ldr(r0, MemOperand(sp, kPointerSize));
-        top_of_stack_state_ = R1_R0_TOS;
-        break;
-      case R0_R1_TOS:
-        __ Push(r1, r0);
-        top_of_stack_state_ = R0_R1_TOS;
-        break;
-      case R1_R0_TOS:
-        __ Push(r0, r1);
-        top_of_stack_state_ = R1_R0_TOS;
-        break;
-      default:
-        UNREACHABLE();
-    }
-  }
-  RaiseHeight(2, tos_known_smi_map_ & 3);
-}
-
-
-Register VirtualFrame::PopToRegister(Register but_not_to_this_one) {
-  ASSERT(but_not_to_this_one.is(r0) ||
-         but_not_to_this_one.is(r1) ||
-         but_not_to_this_one.is(no_reg));
-  LowerHeight(1);
-  if (top_of_stack_state_ == NO_TOS_REGISTERS) {
-    if (but_not_to_this_one.is(r0)) {
-      __ pop(r1);
-      return r1;
-    } else {
-      __ pop(r0);
-      return r0;
-    }
-  } else {
-    Register answer = kTopRegister[top_of_stack_state_];
-    ASSERT(!answer.is(but_not_to_this_one));
-    top_of_stack_state_ = kStateAfterPop[top_of_stack_state_];
-    return answer;
-  }
-}
-
-
-void VirtualFrame::EnsureOneFreeTOSRegister() {
-  if (kVirtualElements[top_of_stack_state_] == kMaxTOSRegisters) {
-    __ push(kBottomRegister[top_of_stack_state_]);
-    top_of_stack_state_ = kStateAfterPush[top_of_stack_state_];
-    top_of_stack_state_ = kStateAfterPop[top_of_stack_state_];
-  }
-  ASSERT(kVirtualElements[top_of_stack_state_] != kMaxTOSRegisters);
-}
-
-
-void VirtualFrame::EmitPush(Register reg, TypeInfo info) {
-  RaiseHeight(1, info.IsSmi() ? 1 : 0);
-  if (reg.is(cp)) {
-    // If we are pushing cp then we are about to make a call and things have to
-    // be pushed to the physical stack.  There's nothing to be gained my moving
-    // to a TOS register and then pushing that, we might as well push to the
-    // physical stack immediately.
-    MergeTOSTo(NO_TOS_REGISTERS);
-    __ push(reg);
-    return;
-  }
-  if (SpilledScope::is_spilled()) {
-    ASSERT(top_of_stack_state_ == NO_TOS_REGISTERS);
-    __ push(reg);
-    return;
-  }
-  if (top_of_stack_state_ == NO_TOS_REGISTERS) {
-    if (reg.is(r0)) {
-      top_of_stack_state_ = R0_TOS;
-      return;
-    }
-    if (reg.is(r1)) {
-      top_of_stack_state_ = R1_TOS;
-      return;
-    }
-  }
-  EnsureOneFreeTOSRegister();
-  top_of_stack_state_ = kStateAfterPush[top_of_stack_state_];
-  Register dest = kTopRegister[top_of_stack_state_];
-  __ Move(dest, reg);
-}
-
-
-void VirtualFrame::SetElementAt(Register reg, int this_far_down) {
-  if (this_far_down < kTOSKnownSmiMapSize) {
-    tos_known_smi_map_ &= ~(1 << this_far_down);
-  }
-  if (this_far_down == 0) {
-    Pop();
-    Register dest = GetTOSRegister();
-    if (dest.is(reg)) {
-      // We already popped one item off the top of the stack.  If the only
-      // free register is the one we were asked to push then we have been
-      // asked to push a register that was already in use, which cannot
-      // happen.  It therefore folows that there are two free TOS registers:
-      ASSERT(top_of_stack_state_ == NO_TOS_REGISTERS);
-      dest = dest.is(r0) ? r1 : r0;
-    }
-    __ mov(dest, reg);
-    EmitPush(dest);
-  } else if (this_far_down == 1) {
-    int virtual_elements = kVirtualElements[top_of_stack_state_];
-    if (virtual_elements < 2) {
-      __ str(reg, ElementAt(this_far_down));
-    } else {
-      ASSERT(virtual_elements == 2);
-      ASSERT(!reg.is(r0));
-      ASSERT(!reg.is(r1));
-      Register dest = kBottomRegister[top_of_stack_state_];
-      __ mov(dest, reg);
-    }
-  } else {
-    ASSERT(this_far_down >= 2);
-    ASSERT(kVirtualElements[top_of_stack_state_] <= 2);
-    __ str(reg, ElementAt(this_far_down));
-  }
-}
-
-
-Register VirtualFrame::GetTOSRegister() {
-  if (SpilledScope::is_spilled()) return r0;
-
-  EnsureOneFreeTOSRegister();
-  return kTopRegister[kStateAfterPush[top_of_stack_state_]];
-}
-
-
-void VirtualFrame::EmitPush(Operand operand, TypeInfo info) {
-  RaiseHeight(1, info.IsSmi() ? 1 : 0);
-  if (SpilledScope::is_spilled()) {
-    __ mov(r0, operand);
-    __ push(r0);
-    return;
-  }
-  EnsureOneFreeTOSRegister();
-  top_of_stack_state_ = kStateAfterPush[top_of_stack_state_];
-  __ mov(kTopRegister[top_of_stack_state_], operand);
-}
-
-
-void VirtualFrame::EmitPush(MemOperand operand, TypeInfo info) {
-  RaiseHeight(1, info.IsSmi() ? 1 : 0);
-  if (SpilledScope::is_spilled()) {
-    __ ldr(r0, operand);
-    __ push(r0);
-    return;
-  }
-  EnsureOneFreeTOSRegister();
-  top_of_stack_state_ = kStateAfterPush[top_of_stack_state_];
-  __ ldr(kTopRegister[top_of_stack_state_], operand);
-}
-
-
-void VirtualFrame::EmitPushRoot(Heap::RootListIndex index) {
-  RaiseHeight(1, 0);
-  if (SpilledScope::is_spilled()) {
-    __ LoadRoot(r0, index);
-    __ push(r0);
-    return;
-  }
-  EnsureOneFreeTOSRegister();
-  top_of_stack_state_ = kStateAfterPush[top_of_stack_state_];
-  __ LoadRoot(kTopRegister[top_of_stack_state_], index);
-}
-
-
-void VirtualFrame::EmitPushMultiple(int count, int src_regs) {
-  ASSERT(SpilledScope::is_spilled());
-  Adjust(count);
-  __ stm(db_w, sp, src_regs);
-}
-
-
-void VirtualFrame::SpillAll() {
-  switch (top_of_stack_state_) {
-    case R1_R0_TOS:
-      masm()->push(r0);
-      // Fall through.
-    case R1_TOS:
-      masm()->push(r1);
-      top_of_stack_state_ = NO_TOS_REGISTERS;
-      break;
-    case R0_R1_TOS:
-      masm()->push(r1);
-      // Fall through.
-    case R0_TOS:
-      masm()->push(r0);
-      top_of_stack_state_ = NO_TOS_REGISTERS;
-      // Fall through.
-    case NO_TOS_REGISTERS:
-      break;
-    default:
-      UNREACHABLE();
-      break;
-  }
-  ASSERT(register_allocation_map_ == 0);  // Not yet implemented.
-}
-
-#undef __
-
-} }  // namespace v8::internal
-
-#endif  // V8_TARGET_ARCH_ARM