/*
* 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;
}
}