diff options
Diffstat (limited to 'plugins/java-decompiler/engine/src/org/jetbrains/java/decompiler/code/Instruction.java')
-rw-r--r-- | plugins/java-decompiler/engine/src/org/jetbrains/java/decompiler/code/Instruction.java | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/plugins/java-decompiler/engine/src/org/jetbrains/java/decompiler/code/Instruction.java b/plugins/java-decompiler/engine/src/org/jetbrains/java/decompiler/code/Instruction.java new file mode 100644 index 000000000000..d77f3b4f4ede --- /dev/null +++ b/plugins/java-decompiler/engine/src/org/jetbrains/java/decompiler/code/Instruction.java @@ -0,0 +1,126 @@ +/* + * 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; + +import java.io.DataOutputStream; +import java.io.IOException; + +public class Instruction implements CodeConstants { + + // ***************************************************************************** + // public fields + // ***************************************************************************** + + public int opcode; + + public int group = CodeConstants.GROUP_GENERAL; + + public boolean wide = false; + + public int bytecode_version = BYTECODE_JAVA_LE_4; + + // ***************************************************************************** + // private fields + // ***************************************************************************** + + private int[] operands = null; + + // ***************************************************************************** + // public methods + // ***************************************************************************** + + public Instruction() { + } + + public int length() { + return 1; + } + + public int operandsCount() { + return (operands == null) ? 0 : operands.length; + } + + public int getOperand(int index) { + return operands[index]; + } + + public Instruction clone() { + return ConstantsUtil.getInstructionInstance(opcode, wide, group, bytecode_version, operands == null ? null : operands.clone()); + } + + public String toString() { + + String res = wide ? "@wide " : ""; + res += "@" + ConstantsUtil.getName(opcode); + + int len = operandsCount(); + for (int i = 0; i < len; i++) { + int op = operands[i]; + if (op < 0) { + res += " -" + Integer.toHexString(-op); + } + else { + res += " " + Integer.toHexString(op); + } + } + + return res; + } + + public boolean canFallthrough() { + return opcode != opc_goto && opcode != opc_goto_w && opcode != opc_ret && + !(opcode >= opc_ireturn && opcode <= opc_return) && opcode != opc_athrow + && opcode != opc_jsr && opcode != opc_tableswitch && opcode != opc_lookupswitch; + } + + public boolean equalsInstruction(Instruction instr) { + if (opcode != instr.opcode || wide != instr.wide + || operandsCount() != instr.operandsCount()) { + return false; + } + + if (operands != null) { + for (int i = 0; i < operands.length; i++) { + if (operands[i] != instr.getOperand(i)) { + return false; + } + } + } + + return true; + } + + // should be overwritten by subclasses + public void initInstruction(InstructionSequence seq) { + } + + // should be overwritten by subclasses + public void writeToStream(DataOutputStream out, int offset) throws IOException { + out.writeByte(opcode); + } + + // ***************************************************************************** + // getter and setter methods + // ***************************************************************************** + + public int[] getOperands() { + return operands; + } + + public void setOperands(int[] operands) { + this.operands = operands; + } +} |