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87 lines
2.8 KiB
87 lines
2.8 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 org.jetbrains.java.decompiler.util.TextUtil;
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public class Instruction implements CodeConstants {
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public static Instruction create(int opcode, boolean wide, int group, int bytecodeVersion, int[] operands) {
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if (opcode >= opc_ifeq && opcode <= opc_if_acmpne ||
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opcode == opc_ifnull || opcode == opc_ifnonnull ||
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opcode == opc_jsr || opcode == opc_jsr_w ||
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opcode == opc_goto || opcode == opc_goto_w) {
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return new JumpInstruction(opcode, group, wide, bytecodeVersion, operands);
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}
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else if (opcode == opc_tableswitch || opcode == opc_lookupswitch) {
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return new SwitchInstruction(opcode, group, wide, bytecodeVersion, operands);
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}
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else {
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return new Instruction(opcode, group, wide, bytecodeVersion, operands);
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}
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}
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public static boolean equals(Instruction i1, Instruction i2) {
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return i1 != null && i2 != null &&
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(i1 == i2 ||
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i1.opcode == i2.opcode &&
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i1.wide == i2.wide &&
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i1.operandsCount() == i2.operandsCount());
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}
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public final int opcode;
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public final int group;
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public final boolean wide;
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public final int bytecodeVersion;
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protected final int[] operands;
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public Instruction(int opcode, int group, boolean wide, int bytecodeVersion, int[] operands) {
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this.opcode = opcode;
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this.group = group;
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this.wide = wide;
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this.bytecodeVersion = bytecodeVersion;
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this.operands = operands;
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}
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public void initInstruction(InstructionSequence seq) { }
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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 operand(int index) {
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return operands[index];
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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) &&
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opcode != opc_athrow &&
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opcode != opc_jsr && opcode != opc_tableswitch && opcode != opc_lookupswitch;
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}
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@Override
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public String toString() {
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StringBuilder res = new StringBuilder();
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if (wide) res.append("@wide ");
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res.append("@").append(TextUtil.getInstructionName(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.append(" -").append(Integer.toHexString(-op));
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}
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else {
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res.append(" ").append(Integer.toHexString(op));
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}
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}
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return res.toString();
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}
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@Override
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@SuppressWarnings("MethodDoesntCallSuperMethod")
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public Instruction clone() {
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return create(opcode, wide, group, bytecodeVersion, operands == null ? null : operands.clone());
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}
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} |