| /* |
| * 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.dex.code; |
| |
| import com.android.dx.rop.code.RegisterSpec; |
| import com.android.dx.rop.code.RegisterSpecList; |
| import com.android.dx.rop.code.SourcePosition; |
| |
| /** |
| * Pseudo-instruction which is used to introduce a new local variable. That |
| * is, an instance of this class in an instruction stream indicates that |
| * starting with the subsequent instruction, the indicated variable |
| * is bound. |
| */ |
| public final class LocalStart extends ZeroSizeInsn { |
| /** |
| * {@code non-null;} register spec representing the local variable introduced |
| * by this instance |
| */ |
| private final RegisterSpec local; |
| |
| /** |
| * Returns the local variable listing string for a single register spec. |
| * |
| * @param spec {@code non-null;} the spec to convert |
| * @return {@code non-null;} the string form |
| */ |
| public static String localString(RegisterSpec spec) { |
| return spec.regString() + ' ' + spec.getLocalItem().toString() + ": " + |
| spec.getTypeBearer().toHuman(); |
| } |
| |
| /** |
| * Constructs an instance. The output address of this instance is initially |
| * unknown ({@code -1}). |
| * |
| * @param position {@code non-null;} source position |
| * @param local {@code non-null;} register spec representing the local |
| * variable introduced by this instance |
| */ |
| public LocalStart(SourcePosition position, RegisterSpec local) { |
| super(position); |
| |
| if (local == null) { |
| throw new NullPointerException("local == null"); |
| } |
| |
| this.local = local; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public DalvInsn withRegisterOffset(int delta) { |
| return new LocalStart(getPosition(), local.withOffset(delta)); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public DalvInsn withRegisters(RegisterSpecList registers) { |
| return new LocalStart(getPosition(), local); |
| } |
| |
| /** |
| * Gets the register spec representing the local variable introduced |
| * by this instance. |
| * |
| * @return {@code non-null;} the register spec |
| */ |
| public RegisterSpec getLocal() { |
| return local; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| protected String argString() { |
| return local.toString(); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| protected String listingString0(boolean noteIndices) { |
| return "local-start " + localString(local); |
| } |
| } |