content: /*
   * 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.taobao.android.dx.ssa.back;
  
  import com.taobao.android.dx.ssa.BasicRegisterMapper;
  import com.taobao.android.dx.ssa.RegisterMapper;
  import com.taobao.android.dx.ssa.SsaMethod;
  
  /**
   * 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;
      }
  }
  