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112 lines
3.0 KiB
112 lines
3.0 KiB
// Copyright 2000-2017 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.
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package org.jetbrains.java.decompiler.code;
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import java.io.DataOutputStream;
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import java.io.IOException;
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public class Instruction implements CodeConstants {
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// *****************************************************************************
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// public fields
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// *****************************************************************************
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public int opcode;
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public int group = CodeConstants.GROUP_GENERAL;
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public boolean wide = false;
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public int bytecode_version = BYTECODE_JAVA_LE_4;
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// *****************************************************************************
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// private fields
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// *****************************************************************************
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private int[] operands = null;
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// *****************************************************************************
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// public methods
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// *****************************************************************************
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public Instruction() {
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}
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public int length() {
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return 1;
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}
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public int operandsCount() {
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return (operands == null) ? 0 : operands.length;
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}
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public int getOperand(int index) {
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return operands[index];
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}
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public Instruction clone() {
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return ConstantsUtil.getInstructionInstance(opcode, wide, group, bytecode_version, operands == null ? null : operands.clone());
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}
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public String toString() {
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String res = wide ? "@wide " : "";
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res += "@" + ConstantsUtil.getName(opcode);
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int len = operandsCount();
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for (int i = 0; i < len; i++) {
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int op = operands[i];
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if (op < 0) {
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res += " -" + Integer.toHexString(-op);
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}
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else {
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res += " " + Integer.toHexString(op);
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}
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}
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return res;
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}
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public boolean canFallthrough() {
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return opcode != opc_goto && opcode != opc_goto_w && opcode != opc_ret &&
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!(opcode >= opc_ireturn && opcode <= opc_return) && opcode != opc_athrow
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&& opcode != opc_jsr && opcode != opc_tableswitch && opcode != opc_lookupswitch;
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}
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public boolean equalsInstruction(Instruction instr) {
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if (opcode != instr.opcode || wide != instr.wide
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|| operandsCount() != instr.operandsCount()) {
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return false;
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}
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if (operands != null) {
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for (int i = 0; i < operands.length; i++) {
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if (operands[i] != instr.getOperand(i)) {
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return false;
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}
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}
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}
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return true;
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}
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// should be overwritten by subclasses
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public void initInstruction(InstructionSequence seq) {
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}
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// should be overwritten by subclasses
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public void writeToStream(DataOutputStream out, int offset) throws IOException {
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out.writeByte(opcode);
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}
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// *****************************************************************************
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// getter and setter methods
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// *****************************************************************************
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public int[] getOperands() {
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return operands;
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}
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public void setOperands(int[] operands) {
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this.operands = operands;
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}
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}
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