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fernflower/src/org/jetbrains/java/decompiler/code/InstructionSequence.java

148 lines
3.7 KiB

6 years ago
// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
package org.jetbrains.java.decompiler.code;
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import org.jetbrains.java.decompiler.main.DecompilerContext;
import org.jetbrains.java.decompiler.util.TextUtil;
import org.jetbrains.java.decompiler.util.VBStyleCollection;
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public abstract class InstructionSequence {
// *****************************************************************************
// private fields
// *****************************************************************************
protected final VBStyleCollection<Instruction, Integer> collinstr;
protected int pointer = 0;
protected ExceptionTable exceptionTable = ExceptionTable.EMPTY;
protected InstructionSequence() {
this(new VBStyleCollection<>());
}
protected InstructionSequence(VBStyleCollection<Instruction, Integer> collinstr) {
this.collinstr = collinstr;
}
// *****************************************************************************
// public methods
// *****************************************************************************
// to nbe overwritten
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@Override
public InstructionSequence clone() {
return null;
}
public void clear() {
collinstr.clear();
pointer = 0;
exceptionTable = ExceptionTable.EMPTY;
}
public void addInstruction(Instruction inst, int offset) {
collinstr.addWithKey(inst, offset);
}
public void addInstruction(int index, Instruction inst, int offset) {
collinstr.addWithKeyAndIndex(index, inst, offset);
}
public void addSequence(InstructionSequence seq) {
for (int i = 0; i < seq.length(); i++) {
addInstruction(seq.getInstr(i), -1); // TODO: any sensible value possible?
}
}
public void removeInstruction(int index) {
collinstr.remove(index);
}
public void removeLast() {
if (!collinstr.isEmpty()) {
collinstr.remove(collinstr.size() - 1);
}
}
public Instruction getInstr(int index) {
return collinstr.get(index);
}
public Instruction getLastInstr() {
return collinstr.getLast();
}
public int getOffset(int index) {
return collinstr.getKey(index);
}
public int getPointerByAbsOffset(int offset) {
Integer absoffset = offset;
if (collinstr.containsKey(absoffset)) {
return collinstr.getIndexByKey(absoffset);
}
else {
return -1;
}
}
public int getPointerByRelOffset(int offset) {
Integer absoffset = collinstr.getKey(pointer) + offset;
if (collinstr.containsKey(absoffset)) {
return collinstr.getIndexByKey(absoffset);
}
else {
return -1;
}
}
public int length() {
return collinstr.size();
}
public boolean isEmpty() {
return collinstr.isEmpty();
}
public void addToPointer(int diff) {
this.pointer += diff;
}
public String toString() {
return toString(0);
}
public String toString(int indent) {
String new_line_separator = DecompilerContext.getNewLineSeparator();
StringBuilder buf = new StringBuilder();
for (int i = 0; i < collinstr.size(); i++) {
buf.append(TextUtil.getIndentString(indent));
buf.append(collinstr.getKey(i).intValue());
buf.append(": ");
buf.append(collinstr.get(i).toString());
buf.append(new_line_separator);
}
return buf.toString();
}
// *****************************************************************************
// getter and setter methods
// *****************************************************************************
public int getPointer() {
return pointer;
}
public void setPointer(int pointer) {
this.pointer = pointer;
}
public ExceptionTable getExceptionTable() {
return exceptionTable;
}
}