add ARETURN 支持返回对象

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

@@ -547,7 +547,7 @@ public abstract class InstructionFactory {
                 return new DRETURN(codeStream);
             }
             case Const.ARETURN -> {
-                throw new Error("Not support JavaVM opcode ARETURN");
+                return new ARETURN(codeStream);
             }
             case Const.RETURN -> {
                 return new RETURN(codeStream);

src/main/java/haidnor/jvm/instruction/control/ARETURN.java

@@ -0,0 +1,26 @@
+package haidnor.jvm.instruction.control;
+
+import haidnor.jvm.instruction.Instruction;
+import haidnor.jvm.runtime.Frame;
+import haidnor.jvm.runtime.StackValue;
+import haidnor.jvm.util.CodeStream;
+import haidnor.jvm.util.JvmThreadHolder;
+
+public class ARETURN extends Instruction {
+
+    public ARETURN(CodeStream codeStream) {
+        super(codeStream);
+    }
+
+    @Override
+    public void execute(Frame frame) {
+        // 弹出操作数栈中的值
+        StackValue stackValue = frame.pop();
+        // 将当前栈帧从 jvm 线程栈中弹出
+        JvmThreadHolder.get().pop();
+        // 将方法返回值压入前一个栈帧的操作数栈中
+        Frame topFrame = JvmThreadHolder.get().peek();
+        topFrame.push(stackValue);
+    }
+
+}

src/main/java/haidnor/jvm/instruction/references/INVOKESTATIC.java

@@ -53,7 +53,7 @@ public class INVOKESTATIC extends Instruction {
                 }
             }
 
-            Class<?> javaClass = Class.forName(Utility.compactClassName(className,false));
+            Class<?> javaClass = Class.forName(Utility.compactClassName(className, false));
             java.lang.reflect.Method method = javaClass.getMethod(methodName, parameterTypeArr);
             method.setAccessible(true);
             Object value = method.invoke(null, stacksValueArr);
@@ -63,17 +63,20 @@ public class INVOKESTATIC extends Instruction {
         }
         // 自定义类的方法
         else {
-            Klass meteKlass = Metaspace.getJavaClass(Utility.compactClassName(className));
-            if (meteKlass != null) {
-                JavaClass javaClass = meteKlass.getJavaClass();
-                for (Method method : javaClass.getMethods()) {
-                    if (method.getSignature().equals(methodSignature) && method.getName().equals(methodName)) {
-                        KlassMethod klassMethod = new KlassMethod(meteKlass, method);
-                        JavaExecutionEngine.callMethod(frame, klassMethod);
-                        break;
-                    }
+            Klass klass = Metaspace.getJavaClass(Utility.compactClassName(className));
+            // 调用静态方法时加载类
+            if (klass == null) {
+                klass = frame.getMetaClass().getClassLoader().loadClass(className);
+            }
+            JavaClass javaClass = klass.getJavaClass();
+            for (Method method : javaClass.getMethods()) {
+                if (method.getSignature().equals(methodSignature) && method.getName().equals(methodName)) {
+                    KlassMethod klassMethod = new KlassMethod(klass, method);
+                    JavaExecutionEngine.callMethod(frame, klassMethod);
+                    break;
                 }
             }
+
         }
 
     }

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

@@ -1,7 +1,9 @@
 package haidnor.jvm.test.clazz;
 
 public class Human {
+
     public void eat() {
         System.out.println("人类吃饭");
     }
+
 }

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

@@ -2,6 +2,16 @@ package haidnor.jvm.test.clazz;
 
 public class Student extends Human {
 
-    public static String name = "张三";
+    public static String school = "家里蹲大学";
+
+    public String name;
+
+    public void printSchool() {
+        System.out.println(school);
+    }
+
+    public static Student newStudent() {
+        return new Student();
+    }
 
 }

src/test/java/haidnor/jvm/test/demo/Demo3.java

@@ -1,16 +1,14 @@
 package haidnor.jvm.test.demo;
 
+import haidnor.jvm.test.clazz.Student;
+
 import java.util.HashMap;
 
 public class Demo3 {
 
     public static void main(String[] args) {
-        Student sut1 = new Student(1);
-        Student sut2 = new Student(2);
-
-        if (sut1 == sut2) {
-
-        }
+        Student sut1 = new Student();
+        Student sut2 = new Student();
 
         HashMap<Student, String> hashMap = new HashMap<>();
         hashMap.put(sut1, "张三");
@@ -22,13 +20,3 @@ public class Demo3 {
 
 }
 
-class Student {
-
-    public int age;
-
-    public Student(int age) {
-        this.age = age;
-    }
-
-
-}

src/test/java/haidnor/jvm/test/demo/Demo4.java

@@ -5,8 +5,10 @@ import haidnor.jvm.test.clazz.Student;
 public class Demo4 {
 
     public static void main(String[] args) {
-        Student student = new Student();
+        Student student = Student.newStudent();
         student.eat();
+        student.name = "张三";
+        System.out.println(student.name);
     }
 
 }