Initial commit

src/main/java/haidnor/jvm/instruction/Instruction.java

@@ -0,0 +1,40 @@
+package haidnor.jvm.instruction;
+
+import haidnor.jvm.runtime.Frame;
+import haidnor.jvm.util.CodeStream;
+
+public abstract class Instruction {
+    /**
+     * 指令坐在 code 数组中的索引下标
+     */
+    private final int index;
+
+    /**
+     * 执行下一个执行的偏移量
+     */
+    private int offSet = 1;
+
+    public Instruction(CodeStream codeStream) {
+        this.index = codeStream.index();
+    }
+
+    public abstract void execute(Frame frame);
+
+    public int index() {
+        return index;
+    }
+
+    public final int offSet() {
+        return this.offSet;
+    }
+
+    public void setOffSet(int offSet) {
+        this.offSet = offSet;
+    }
+
+    @Override
+    public String toString() {
+        return index + " " + this.getClass().getSimpleName();
+    }
+
+}