diff options
Diffstat (limited to 'dx/src/com/android/jack/dx/ssa/RegisterMapper.java')
-rw-r--r-- | dx/src/com/android/jack/dx/ssa/RegisterMapper.java | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/dx/src/com/android/jack/dx/ssa/RegisterMapper.java b/dx/src/com/android/jack/dx/ssa/RegisterMapper.java new file mode 100644 index 00000000..300d956b --- /dev/null +++ b/dx/src/com/android/jack/dx/ssa/RegisterMapper.java @@ -0,0 +1,61 @@ +/* + * 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.rop.code.RegisterSpecList; +import com.android.jack.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; + } +} |