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/*
* 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.jack.dx.ssa;
import com.android.jack.dx.rop.code.RegisterSpec;
import com.android.jack.dx.util.IntList;
/**
* This class maps one register space into another, with
* each mapping built up individually and added via addMapping()
*/
public class BasicRegisterMapper extends RegisterMapper {
/** indexed by old register, containing new name */
private IntList oldToNew;
/** running count of used registers in new namespace */
private int runningCountNewRegisters;
/**
* Creates a new OneToOneRegisterMapper.
*
* @param countOldRegisters the number of registers in the old name space
*/
public BasicRegisterMapper(int countOldRegisters) {
oldToNew = new IntList(countOldRegisters);
}
/** {@inheritDoc} */
@Override
public int getNewRegisterCount() {
return runningCountNewRegisters;
}
/** {@inheritDoc} */
@Override
public RegisterSpec map(RegisterSpec registerSpec) {
if (registerSpec == null) {
return null;
}
int newReg;
try {
newReg = oldToNew.get(registerSpec.getReg());
} catch (IndexOutOfBoundsException ex) {
newReg = -1;
}
if (newReg < 0) {
throw new RuntimeException("no mapping specified for register");
}
return registerSpec.withReg(newReg);
}
/**
* Returns the new-namespace mapping for the specified
* old-namespace register, or -1 if one exists.
*
* @param oldReg {@code >= 0;} old-namespace register
* @return new-namespace register or -1 if none
*/
public int oldToNew(int oldReg) {
if (oldReg >= oldToNew.size()) {
return -1;
}
return oldToNew.get(oldReg);
}
/** {@inheritDoc} */
public String toHuman() {
StringBuilder sb = new StringBuilder();
sb.append("Old\tNew\n");
int sz = oldToNew.size();
for (int i = 0; i < sz; i++) {
sb.append(i);
sb.append('\t');
sb.append(oldToNew.get(i));
sb.append('\n');
}
sb.append("new reg count:");
sb.append(runningCountNewRegisters);
sb.append('\n');
return sb.toString();
}
/**
* Adds a mapping to the mapper. If oldReg has already been mapped,
* overwrites previous mapping with new mapping.
*
* @param oldReg {@code >= 0;} old register
* @param newReg {@code >= 0;} new register
* @param category {@code 1..2;} width of reg
*/
public void addMapping(int oldReg, int newReg, int category) {
if (oldReg >= oldToNew.size()) {
// expand the array as necessary
for (int i = oldReg - oldToNew.size(); i >= 0; i--) {
oldToNew.add(-1);
}
}
oldToNew.set(oldReg, newReg);
if (runningCountNewRegisters < (newReg + category)) {
runningCountNewRegisters = newReg + category;
}
}
}
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