Package com.android.dx.ssa.back

Source Code of com.android.dx.ssa.back.NullRegisterAllocator

/*
* 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;
    }   
}
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