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;
+  }
+}