| /* |
| * 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; |
| |
| import com.android.dx.rop.code.RegisterSpec; |
| import com.android.dx.rop.code.RegisterSpecList; |
| import com.android.dx.util.ToHuman; |
| |
| /** |
| * Represents a mapping between two register numbering schemes. |
| * Subclasses of this may be mutable, and as such the mapping provided |
| * is only valid for the lifetime of the method call in which |
| * instances of this class are passed. |
| */ |
| public abstract class RegisterMapper { |
| /** |
| * Gets the count of registers (really, the total register width, since |
| * category width is counted) in the new namespace. |
| * @return >= 0 width of new namespace. |
| */ |
| public abstract int getNewRegisterCount(); |
| |
| /** |
| * @param registerSpec old register |
| * @return register in new space |
| */ |
| public abstract RegisterSpec map(RegisterSpec registerSpec); |
| |
| /** |
| * |
| * @param sources old register list |
| * @return new mapped register list, or old if nothing has changed. |
| */ |
| public final RegisterSpecList map(RegisterSpecList sources) { |
| int sz = sources.size(); |
| RegisterSpecList newSources = new RegisterSpecList(sz); |
| |
| for (int i = 0; i < sz; i++) { |
| newSources.set(i, map(sources.get(i))); |
| } |
| |
| newSources.setImmutable(); |
| |
| // Return the old sources if nothing has changed. |
| return newSources.equals(sources) ? sources : newSources; |
| } |
| } |