update

README.md

@@ -30,6 +30,9 @@
 ### 配置日志输出级别
 修改 `simplelogger.properties` 文件中的内容。配置日志输出级别，一般使用 `debug`、`info`
 
+在 debug 级别下运行将会非常友好的输出 JVM 正在执行的栈信息
+![](/readme/20230721180520.png)
+
 ### 配置 rt.jar
 修改 `haidnorJVM.properties` 文件中的内容。配置 rt.jar 的绝对路径，例如`rt.jar=D:/Program Files/Java/jdk1.8.0_361/jre/lib/rt.jar`
 

src/main/java/haidnor/jvm/Main.java

@@ -9,10 +9,11 @@ import haidnor.jvm.runtime.JvmThread;
 import haidnor.jvm.util.JavaClassUtil;
 import haidnor.jvm.util.JvmThreadHolder;
 import lombok.SneakyThrows;
-import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.cli.*;
 
-@Slf4j
+/**
+ * @author wang xiang
+ */
 public class Main {
 
     @SneakyThrows

src/main/java/haidnor/jvm/classloader/BootstrapClassLoader.java

@@ -1,8 +0,0 @@
-package haidnor.jvm.classloader;
-
-/**
- * @author wang xiang
- */
-public class BootstrapClassLoader {
-
-}

src/main/java/haidnor/jvm/core/Interpreter.java

@@ -13,37 +13,49 @@ import java.util.Map;
 
 /**
  * 字节码执行解释器
+ *
+ * @author wang xiang
  */
 @Slf4j
 public class Interpreter {
 
+    private static int frameCount = -1;
+
     @SneakyThrows
     public static void executeFrame(Frame frame) {
-        log.debug("------------------------------ Frame START {}", frame.hashCode());
+        frameCount++;
+        StringBuilder blank = new StringBuilder();
+        blank.append("                    ".repeat(Math.max(0, frameCount)));
+        int index = 0;
+        for (int i = 0; i < frameCount; i++) {
+            blank.replace(index, index + 1, "│");
+            index += 20;
+        }
+
+        log.debug("{}┌──────────────────[{}] {} | {} ", blank, frameCount + 1, frame.aKlass.getClassName(), frame.getMethod());
         Map<Integer, Instruction> instructionMap = new HashMap<>();
 
         // 解析方法中的字节码指令
-        log.debug(">>>>>>>>>>>>>>>> PARSE INST START");
         CodeStream codeStream = frame.getCodeStream();
         while (codeStream.available() > 0) {
             Instruction instruction = InstructionFactory.creatInstruction(codeStream);
-            log.debug("{}", instruction);
+            // log.debug("{}│>{}", blank, instruction);
             instructionMap.put(instruction.index(), instruction);
         }
-        log.debug(">>>>>>>>>>>>>>>> PARSE INST END");
+        // log.debug("{}├╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌", blank);
 
-        // 执行方法中的字节码指令
-        // int i, 相当于程序计数器, 记录当前执行到的字节码指令的”行号“
+        // 执行方法中的字节码指令 tip:(int i, 相当于程序计数器, 记录当前执行到的字节码指令的”行号“)
         for (int i = 0; i < frame.getCodeLength(); ) {
             Instruction instruction = instructionMap.get(i);
-            log.debug("{}", instruction);
+            log.debug("{}│ {}", blank, instruction);
             instruction.execute(frame);
             if (instruction instanceof RETURN) {
                 break;
             }
             i += instruction.offSet();
         }
-        log.debug("------------------------------ Frame End {}", frame.hashCode());
+        log.debug("{}└──────────────────", blank);
+        frameCount--;
     }
 
 }

src/main/java/haidnor/jvm/rtda/heap/ArrayInstance.java

@@ -1,5 +1,8 @@
 package haidnor.jvm.rtda.heap;
 
+/**
+ * @author wang xiang
+ */
 public abstract class ArrayInstance extends Instance {
 
     public final int size;

src/main/java/haidnor/jvm/rtda/heap/BasicTypeArray.java

@@ -1,5 +1,8 @@
 package haidnor.jvm.rtda.heap;
 
+/**
+ * @author wang xiang
+ */
 public class BasicTypeArray extends ArrayInstance {
 
     public int[] ints;

src/main/java/haidnor/jvm/rtda/heap/Instance.java

@@ -7,6 +7,8 @@ import java.util.Objects;
 
 /**
  * JVM 中的 Java 对象实例
+ *
+ * @author wang xiang
  */
 public class Instance {
 

src/main/java/haidnor/jvm/rtda/heap/InstanceArray.java

@@ -1,5 +1,8 @@
 package haidnor.jvm.rtda.heap;
 
+/**
+ * @author wang xiang
+ */
 public class InstanceArray extends ArrayInstance {
 
     public final Instance[] items;

src/main/java/haidnor/jvm/rtda/heap/Klass.java

@@ -15,6 +15,8 @@ import java.util.Map;
 
 /**
  * 类元信息
+ *
+ * @author wang xiang
  */
 public class Klass {
 

src/main/java/haidnor/jvm/rtda/heap/KlassField.java

@@ -6,6 +6,8 @@ import org.apache.bcel.classfile.Field;
 
 /**
  * 类元信息字段
+ *
+ * @author wang xiang
  */
 public class KlassField {
 

src/main/java/haidnor/jvm/rtda/heap/KlassMethod.java

@@ -4,6 +4,8 @@ import org.apache.bcel.classfile.Method;
 
 /**
  * 类元信息方法
+ *
+ * @author wang xiang
  */
 public class KlassMethod {
 

src/main/java/haidnor/jvm/rtda/metaspace/Metaspace.java

@@ -7,6 +7,8 @@ import java.util.concurrent.ConcurrentHashMap;
 
 /**
  * 元空间
+ *
+ * @author wang xiang
  */
 public class Metaspace {
 

src/main/java/haidnor/jvm/runtime/Frame.java

@@ -14,6 +14,8 @@ import java.util.Stack;
 
 /**
  * JVM 线程栈帧
+ *
+ * @author wang xiang
  */
 public class Frame {
     /**

src/main/java/haidnor/jvm/runtime/JvmThread.java

@@ -4,6 +4,8 @@ import java.util.Stack;
 
 /**
  * JVM 线程
+ *
+ * @author wang xiang
  */
 public class JvmThread extends Thread {
 
@@ -25,7 +27,7 @@ public class JvmThread extends Thread {
     }
 
     public int stackSize() {
-       return this.stack.size();
+        return this.stack.size();
     }
 
 }

src/main/java/haidnor/jvm/runtime/Slot.java

@@ -1,6 +1,8 @@
 package haidnor.jvm.runtime;
 
-
+/**
+ * @author wang xiang
+ */
 public class Slot {
     public Integer num;
     public Object ref;

src/main/java/haidnor/jvm/runtime/StackValue.java

@@ -4,6 +4,8 @@ import lombok.Data;
 
 /**
  * 操作数栈中的值对象
+ *
+ * @author wang xiang
  */
 @Data
 public class StackValue {

src/main/java/haidnor/jvm/util/CodeStream.java

@@ -6,6 +6,9 @@ import org.apache.bcel.classfile.Code;
 
 import java.io.DataInputStream;
 
+/**
+ * @author wang xiang
+ */
 public class CodeStream {
 
     /**

src/main/java/haidnor/jvm/util/ConstantPoolUtil.java

@@ -3,7 +3,7 @@ package haidnor.jvm.util;
 import org.apache.bcel.classfile.*;
 
 /**
- * ConstantPoolUtil
+ * @author wang xiang
  */
 public class ConstantPoolUtil {
 
@@ -29,6 +29,14 @@ public class ConstantPoolUtil {
         return cp.getConstant(constantNameAndTypeIndex);
     }
 
+
+    //
+
+    public ConstantPool getCp() {
+        return cp;
+    }
+
+
     // ConstantClass ---------------------------------------------------------------------------------------------------
 
     /**
@@ -38,6 +46,14 @@ public class ConstantPoolUtil {
         ConstantUtf8 constantUtf8 = cp.getConstant(constantClass.getNameIndex());
         return constantUtf8.getBytes();
     }
+    /**
+     * 获取长类名, 例如 java/lang/String
+     */
+    public String getClassName(int index) {
+        ConstantClass constantClass = cp.getConstant(index);
+        return getClassName(constantClass);
+    }
+
 
     // ConstantFieldref ------------------------------------------------------------------------------------------------
 

src/main/java/haidnor/jvm/util/IoUtil.java

@@ -3,6 +3,9 @@ package haidnor.jvm.util;
 import java.io.ByteArrayInputStream;
 import java.io.DataInputStream;
 
+/**
+ * @author wang xiang
+ */
 public abstract class IoUtil {
 
     public static DataInputStream getDataInputStream(byte[] bytes) {

src/main/java/haidnor/jvm/util/JavaClassUtil.java

@@ -4,6 +4,9 @@ import haidnor.jvm.rtda.heap.Klass;
 import haidnor.jvm.rtda.heap.KlassMethod;
 import org.apache.bcel.classfile.JavaClass;
 
+/**
+ * @author wang xiang
+ */
 public abstract class JavaClassUtil {
 
     /**

src/main/java/haidnor/jvm/util/JvmThreadHolder.java

@@ -2,6 +2,9 @@ package haidnor.jvm.util;
 
 import haidnor.jvm.runtime.JvmThread;
 
+/**
+ * @author wang xiang
+ */
 public abstract class JvmThreadHolder {
 
     private static final ThreadLocal<JvmThread> holder = new ThreadLocal<>();

src/main/java/haidnor/jvm/util/SignatureUtil.java

@@ -3,6 +3,9 @@ package haidnor.jvm.util;
 import lombok.SneakyThrows;
 import org.apache.bcel.classfile.Utility;
 
+/**
+ * @author wang xiang
+ */
 public abstract class SignatureUtil {
 
     /**

src/test/java/haidnor/jvm/test/clazz/Student.java

@@ -1,5 +1,5 @@
 package haidnor.jvm.test.clazz;
 
 public class Student extends Human {
-    public static String school = "家里蹲大学";
+    public static String school = "Hello World!";
 }