StackOperateTest__分析操作栈

CPU-Code · CPU-Code · commit 6ff9eeeb04d7 · 2021-01-27T15:45:35.000+08:00
diff --git a/JVM/src/com/cpucode/java/instruction/analysis/StackOperateTest.java b/JVM/src/com/cpucode/java/instruction/analysis/StackOperateTest.java
@@ -0,0 +1,63 @@
+package com.cpucode.java.instruction.analysis;
+
+/**
+ * 指令6：操作数栈管理指令
+ * @author : cpucode
+ * @Date : 2021/1/27
+ * @Time : 15:23
+ * @Github : https://github.com/CPU-Code
+ * @CSDN : https://blog.csdn.net/qq_44226094
+ */
+public class StackOperateTest {
+    public void print(){
+        Object obj = new Object();
+
+        String info = obj.toString();
+
+        obj.toString();
+
+        /**
+         *  0     1     2
+         * this  obj  info
+         *
+         *  0 new #3 <java/lang/Object>
+         *  3 dup           复制
+         *  4 invokespecial #1 <java/lang/Object.<init>>    调用父类方法
+         *  7 astore_1
+         *
+         *  8 aload_1
+         *  9 invokevirtual #4 <java/lang/Object.toString>  调用实例方法
+         * 12 astore_2
+         *
+         * 13 aload_1
+         * 14 invokevirtual #4 <java/lang/Object.toString>
+         * 17 pop       出栈
+         * 18 return
+         * */
+    }
+
+    public void foo(){
+        bar();
+    }
+
+    public long bar(){
+        return 0;
+    }
+
+    public long nextIndex(){
+        return index++;
+
+        /**
+         *  0 aload_0       将 this 压栈
+         *  1 dup       复制
+         *  2 getfield #2 <com/cpucode/java/instruction/analysis/StackOperateTest.index>    根据 栈中this地址 将 index 压栈
+         *  5 dup2_x1       复制俩个槽 压栈到第二个下面
+         *  6 lconst_1      压栈 俩个槽 1
+         *  7 ladd      long加法
+         *  8 putfield #2 <com/cpucode/java/instruction/analysis/StackOperateTest.index>  将 栈中结果 复制到this的index
+         * 11 lreturn   long 返回
+         * */
+    }
+
+    private long index = 10;
+}
diff --git a/README.md b/README.md
@@ -729,6 +729,7 @@ java编程基础 面向对象 javaAPI 集合 IO GUI JD8C 多线程 网络编程
 - [x] [NewTest__分析数组创建](JVM/src/com/cpucode/java/instruction/analysis/NewTest.java)
 - [x] [MethodInvokeReturnTest__调用和返回方法](JVM/src/com/cpucode/java/instruction/analysis/MethodInvokeReturnTest.java)
 - [x] [InterfaceMethodTest__分析接口方法](JVM/src/com/cpucode/java/instruction/analysis/InterfaceMethodTest.java)
+- [x] [StackOperateTest__分析操作栈](JVM/src/com/cpucode/java/instruction/analysis/StackOperateTest.java)
 
 - [返回目录](#文件目录)
 
