| /* |
| * 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.dex.code; |
| |
| import com.android.jack.dx.dex.DexOptions; |
| |
| import java.util.ArrayList; |
| |
| /** |
| * Destination for {@link DalvInsn} instances being output. This class |
| * receives and collects instructions in two pieces — a primary |
| * list and a suffix (generally consisting of adjunct data referred to |
| * by the primary list, such as switch case tables) — which it |
| * merges and emits back out in the form of a {@link DalvInsnList} |
| * instance. |
| */ |
| public final class OutputCollector { |
| /** |
| * {@code non-null;} the associated finisher (which holds the instruction |
| * list in-progress) |
| */ |
| private final OutputFinisher finisher; |
| |
| /** |
| * {@code null-ok;} suffix for the output, or {@code null} if the suffix |
| * has been appended to the main output (by {@link #appendSuffixToOutput}) |
| */ |
| private ArrayList<DalvInsn> suffix; |
| |
| /** |
| * Constructs an instance. |
| * |
| * @param dexOptions {@code non-null;} options for dex output |
| * @param initialCapacity {@code >= 0;} initial capacity of the output list |
| * @param suffixInitialCapacity {@code >= 0;} initial capacity of the output suffix |
| * @param regCount {@code >= 0;} register count for the method |
| * @param paramSize size, in register units, of all the parameters for this method |
| */ |
| public OutputCollector(DexOptions dexOptions, int initialCapacity, int suffixInitialCapacity, |
| int regCount, int paramSize) { |
| this.finisher = new OutputFinisher(dexOptions, initialCapacity, regCount, paramSize); |
| this.suffix = new ArrayList<DalvInsn>(suffixInitialCapacity); |
| } |
| |
| /** |
| * Adds an instruction to the output. |
| * |
| * @param insn {@code non-null;} the instruction to add |
| */ |
| public void add(DalvInsn insn) { |
| finisher.add(insn); |
| } |
| |
| /** |
| * Reverses a branch which is buried a given number of instructions |
| * backward in the output. It is illegal to call this unless the |
| * indicated instruction really is a reversible branch. |
| * |
| * @param which how many instructions back to find the branch; |
| * {@code 0} is the most recently added instruction, |
| * {@code 1} is the instruction before that, etc. |
| * @param newTarget {@code non-null;} the new target for the reversed branch |
| */ |
| public void reverseBranch(int which, CodeAddress newTarget) { |
| finisher.reverseBranch(which, newTarget); |
| } |
| |
| /** |
| * Adds an instruction to the output suffix. |
| * |
| * @param insn {@code non-null;} the instruction to add |
| */ |
| public void addSuffix(DalvInsn insn) { |
| suffix.add(insn); |
| } |
| |
| /** |
| * Gets the results of all the calls on this instance, in the form of |
| * an {@link OutputFinisher}. |
| * |
| * @return {@code non-null;} the output finisher |
| * @throws UnsupportedOperationException if this method has |
| * already been called |
| */ |
| public OutputFinisher getFinisher() { |
| if (suffix == null) { |
| throw new UnsupportedOperationException("already processed"); |
| } |
| |
| appendSuffixToOutput(); |
| return finisher; |
| } |
| |
| /** |
| * Helper for {@link #getFinisher}, which appends the suffix to |
| * the primary output. |
| */ |
| private void appendSuffixToOutput() { |
| int size = suffix.size(); |
| |
| for (int i = 0; i < size; i++) { |
| finisher.add(suffix.get(i)); |
| } |
| |
| suffix = null; |
| } |
| } |