| /* |
| * Copyright (C) 2007 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.dx.ssa.back; |
| |
| import com.android.dx.ssa.BasicRegisterMapper; |
| import com.android.dx.ssa.RegisterMapper; |
| import com.android.dx.ssa.SsaMethod; |
| |
| import java.util.BitSet; |
| import java.util.ArrayList; |
| |
| /** |
| * A register allocator that maps SSA register n to Rop register 2*n, |
| * essentially preserving the original mapping and remaining agnostic |
| * about normal or wide categories. Used for debugging. |
| */ |
| public class NullRegisterAllocator extends RegisterAllocator { |
| /** {@inheritDoc} */ |
| public NullRegisterAllocator(SsaMethod ssaMeth, |
| InterferenceGraph interference) { |
| super(ssaMeth, interference); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public boolean wantsParamsMovedHigh() { |
| // We're not smart enough for this. |
| return false; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public RegisterMapper allocateRegisters() { |
| int oldRegCount = ssaMeth.getRegCount(); |
| |
| BasicRegisterMapper mapper = new BasicRegisterMapper(oldRegCount); |
| |
| for (int i = 0; i < oldRegCount; i++) { |
| mapper.addMapping(i, i*2, 2); |
| } |
| |
| return mapper; |
| } |
| } |