diff options
Diffstat (limited to 'plugins/java-decompiler/engine/src/org/jetbrains/java/decompiler/code/cfg/BasicBlock.java')
-rw-r--r-- | plugins/java-decompiler/engine/src/org/jetbrains/java/decompiler/code/cfg/BasicBlock.java | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/plugins/java-decompiler/engine/src/org/jetbrains/java/decompiler/code/cfg/BasicBlock.java b/plugins/java-decompiler/engine/src/org/jetbrains/java/decompiler/code/cfg/BasicBlock.java new file mode 100644 index 000000000000..61b0a63fd4da --- /dev/null +++ b/plugins/java-decompiler/engine/src/org/jetbrains/java/decompiler/code/cfg/BasicBlock.java @@ -0,0 +1,266 @@ +/* + * Copyright 2000-2014 JetBrains s.r.o. + * + * 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 org.jetbrains.java.decompiler.code.cfg; + +import org.jetbrains.java.decompiler.code.Instruction; +import org.jetbrains.java.decompiler.code.InstructionSequence; +import org.jetbrains.java.decompiler.code.SimpleInstructionSequence; +import org.jetbrains.java.decompiler.main.DecompilerContext; +import org.jetbrains.java.decompiler.modules.decompiler.decompose.IGraphNode; + +import java.util.ArrayList; +import java.util.List; + +public class BasicBlock implements IGraphNode { + + // ***************************************************************************** + // public fields + // ***************************************************************************** + + public int id = 0; + + public int mark = 0; + + // ***************************************************************************** + // private fields + // ***************************************************************************** + + private InstructionSequence seq = new SimpleInstructionSequence(); + + private List<BasicBlock> preds = new ArrayList<BasicBlock>(); + + private List<BasicBlock> succs = new ArrayList<BasicBlock>(); + + private List<Integer> instrOldOffsets = new ArrayList<Integer>(); + + private List<BasicBlock> predExceptions = new ArrayList<BasicBlock>(); + + private List<BasicBlock> succExceptions = new ArrayList<BasicBlock>(); + + + public BasicBlock() { + } + + public BasicBlock(int id) { + this.id = id; + } + + // ***************************************************************************** + // public methods + // ***************************************************************************** + + public Object clone() { + + BasicBlock block = new BasicBlock(); + block.id = id; + block.setSeq(seq.clone()); + block.setInstrOldOffsets(new ArrayList<Integer>(instrOldOffsets)); + + return block; + } + + public void free() { + preds.clear(); + succs.clear(); + instrOldOffsets.clear(); + succExceptions.clear(); + seq = new SimpleInstructionSequence(); + } + + public Instruction getInstruction(int index) { + return seq.getInstr(index); + } + + public Instruction getLastInstruction() { + if (seq.isEmpty()) { + return null; + } + else { + return seq.getLastInstr(); + } + } + + public int size() { + return seq.length(); + } + + public void addPredecessor(BasicBlock block) { + preds.add(block); + } + + public void removePredecessor(BasicBlock block) { + while (preds.remove(block)) ; + } + + public void addSuccessor(BasicBlock block) { + succs.add(block); + block.addPredecessor(this); + } + + public void removeSuccessor(BasicBlock block) { + while (succs.remove(block)) ; + block.removePredecessor(this); + } + + // FIXME: unify block comparisons: id or direkt equality + public void replaceSuccessor(BasicBlock oldBlock, BasicBlock newBlock) { + for (int i = 0; i < succs.size(); i++) { + if (succs.get(i).id == oldBlock.id) { + succs.set(i, newBlock); + oldBlock.removePredecessor(this); + newBlock.addPredecessor(this); + } + } + + for (int i = 0; i < succExceptions.size(); i++) { + if (succExceptions.get(i).id == oldBlock.id) { + succExceptions.set(i, newBlock); + oldBlock.removePredecessorException(this); + newBlock.addPredecessorException(this); + } + } + } + + public void addPredecessorException(BasicBlock block) { + predExceptions.add(block); + } + + public void removePredecessorException(BasicBlock block) { + while (predExceptions.remove(block)) ; + } + + public void addSuccessorException(BasicBlock block) { + if (!succExceptions.contains(block)) { + succExceptions.add(block); + block.addPredecessorException(this); + } + } + + public void removeSuccessorException(BasicBlock block) { + while (succExceptions.remove(block)) ; + block.removePredecessorException(this); + } + + public String toString() { + return toString(0); + } + + public String toString(int indent) { + + String new_line_separator = DecompilerContext.getNewLineSeparator(); + + return id + ":" + new_line_separator + seq.toString(indent); + } + + public String toStringOldIndices() { + + String new_line_separator = DecompilerContext.getNewLineSeparator(); + + StringBuilder buf = new StringBuilder(); + + for (int i = 0; i < seq.length(); i++) { + if (i < instrOldOffsets.size()) { + buf.append(instrOldOffsets.get(i)); + } + else { + buf.append("-1"); + } + buf.append(": "); + buf.append(seq.getInstr(i).toString()); + buf.append(new_line_separator); + } + + return buf.toString(); + } + + public boolean isSuccessor(BasicBlock block) { + for (BasicBlock succ : succs) { + if (succ.id == block.id) { + return true; + } + } + return false; + } + + public boolean isPredecessor(BasicBlock block) { + for (int i = 0; i < preds.size(); i++) { + if (preds.get(i).id == block.id) { + return true; + } + } + return false; + } + + // ***************************************************************************** + // getter and setter methods + // ***************************************************************************** + + public List<Integer> getInstrOldOffsets() { + return instrOldOffsets; + } + + public void setInstrOldOffsets(List<Integer> instrInds) { + this.instrOldOffsets = instrInds; + } + + public List<? extends IGraphNode> getPredecessors() { + List<BasicBlock> lst = new ArrayList<BasicBlock>(preds); + lst.addAll(predExceptions); + return lst; + } + + public List<BasicBlock> getPreds() { + return preds; + } + + public void setPreds(List<BasicBlock> preds) { + this.preds = preds; + } + + public InstructionSequence getSeq() { + return seq; + } + + public void setSeq(InstructionSequence seq) { + this.seq = seq; + } + + public List<BasicBlock> getSuccs() { + return succs; + } + + public void setSuccs(List<BasicBlock> succs) { + this.succs = succs; + } + + + public List<BasicBlock> getSuccExceptions() { + return succExceptions; + } + + + public void setSuccExceptions(List<BasicBlock> succExceptions) { + this.succExceptions = succExceptions; + } + + public List<BasicBlock> getPredExceptions() { + return predExceptions; + } + + public void setPredExceptions(List<BasicBlock> predExceptions) { + this.predExceptions = predExceptions; + } +} |