jvm第二次作业实现

group06/263050006/src/main/java/com/github/chaoswang/learning/java/jvm/clz/ClassFile.java

@@ -10,13 +10,27 @@
 
 public class ClassFile {
 
+	//Class文件的次版本号
 	private int minorVersion;
+	//Class文件的主版本号,Java SE 6.0对应的虚拟机支持Java SE 5.0的编译器编译的Class文件结构，反之则不行
 	private int majorVersion;
 
+	/**
+	 * Class文件中常量池主要存储了字 面量以及符号引用，其中字面量主要包括字符串，
+	 * final常量的值或者某个属性的初始值等等，而符号引用主要存储类和接口的全限定名称，
+	 * 字段的名称以及描 述符，方法的名称以及描述符
+	 * CONSTANT_Utf8_info,CONSTANT_Float_info,CONSTANT_Double_info 
+	 */
+	private ConstantPool pool;
+
+	//表示类或者接口的访问信息
 	private AccessFlag accessFlag;
+	//类的常量池索引、超类的索引
 	private ClassIndex clzIndex;
-	private ConstantPool pool;
+
+	//字段表的信息
 	private List<Field> fields = new ArrayList<Field>();
+	//方法表
 	private List<Method> methods = new ArrayList<Method>();
 
 	public ClassIndex getClzIndex() {
@@ -78,12 +92,12 @@ public List<Method> getMethods() {
 
 	public void print() {
 
-		if (this.accessFlag.isPublicClass()) {
-			System.out.println("Access flag : public  ");
-		}
-		System.out.println("Class Name:" + getClassName());
-
-		System.out.println("Super Class Name:" + getSuperClassName());
+//		if (this.accessFlag.isPublicClass()) {
+//			System.out.println("Access flag : public  ");
+//		}
+//		System.out.println("Class Name:" + getClassName());
+//
+//		System.out.println("Super Class Name:" + getSuperClassName());
 
 	}
 

group06/263050006/src/main/java/com/github/chaoswang/learning/java/jvm/constant/ClassInfo.java

@@ -1,6 +1,12 @@
 package com.github.chaoswang.learning.java.jvm.constant;
-
+/**
+ * CONSTANT_Class_info { 
+ * u1 tag; 
+ * u2 name_index; 
+ * }
+ */
 public class ClassInfo extends ConstantInfo {
+
 	private int type = ConstantInfo.CLASS_INFO;
 	private int utf8Index;
 

group06/263050006/src/main/java/com/github/chaoswang/learning/java/jvm/constant/FieldRefInfo.java

@@ -1,6 +1,13 @@
 package com.github.chaoswang.learning.java.jvm.constant;
-
+/**
+ * CONSTANT_Fieldref_info { 
+ * u1 tag; 
+ * u2 class_index; 
+ * u2 name_and_type_index;
+ * }
+ */
 public class FieldRefInfo extends ConstantInfo{
+
 	private int type = ConstantInfo.FIELD_INFO;
 	private int classInfoIndex;
 	private int nameAndTypeIndex;

group06/263050006/src/main/java/com/github/chaoswang/learning/java/jvm/constant/MethodRefInfo.java

@@ -1,9 +1,14 @@
 package com.github.chaoswang.learning.java.jvm.constant;
-
+/**
+ * CONSTANT_Methodref_info { 
+ * u1 tag; 
+ * u2 class_index; 
+ * u2 name_and_type_index;
+ */
 public class MethodRefInfo extends ConstantInfo {
 
+
 	private int type = ConstantInfo.METHOD_INFO;
-
 	private int classInfoIndex;
 	private int nameAndTypeIndex;
 

group06/263050006/src/main/java/com/github/chaoswang/learning/java/jvm/constant/NameAndTypeInfo.java

@@ -1,8 +1,14 @@
 package com.github.chaoswang.learning.java.jvm.constant;
-
+/**
+ * CONSTANT_NameAndType_info { 
+ * u1 tag; 
+ * u2 name_index; 
+ * u2 descriptor_index;
+ * }
+ */
 public class NameAndTypeInfo extends ConstantInfo {
+
 	public int type = ConstantInfo.NAME_AND_TYPE_INFO;
-
 	private int index1;
 	private int index2;
 

group06/263050006/src/main/java/com/github/chaoswang/learning/java/jvm/constant/StringInfo.java

@@ -1,6 +1,11 @@
 package com.github.chaoswang.learning.java.jvm.constant;
-
+/**
+ * CONSTANT_String_info { 
+ * u1 tag; 
+ * u2 string_index;
+ */
 public class StringInfo extends ConstantInfo {
+
 	private int type = ConstantInfo.STRING_INFO;
 	private int index;
 

group06/263050006/src/main/java/com/github/chaoswang/learning/java/jvm/constant/UTF8Info.java

@@ -1,6 +1,14 @@
 package com.github.chaoswang.learning.java.jvm.constant;
 
+/**
+ * CONSTANT_Utf8_info { 
+ * u1 tag; 
+ * u2 length; 
+ * u1 bytes[length]; 
+ * }
+ */
 public class UTF8Info extends ConstantInfo {
+
 	private int type = ConstantInfo.UTF8_INFO;
 	private int length;
 	private String value;

group06/263050006/src/main/java/com/github/chaoswang/learning/java/jvm/loader/ClassFileParser.java

@@ -3,29 +3,72 @@
 import com.github.chaoswang.learning.java.jvm.clz.AccessFlag;
 import com.github.chaoswang.learning.java.jvm.clz.ClassFile;
 import com.github.chaoswang.learning.java.jvm.clz.ClassIndex;
+import com.github.chaoswang.learning.java.jvm.constant.ClassInfo;
 import com.github.chaoswang.learning.java.jvm.constant.ConstantPool;
+import com.github.chaoswang.learning.java.jvm.constant.UTF8Info;
 
 public class ClassFileParser {
-
+
+
 	public ClassFile parse(byte[] codes) {
-
-		return null;
+		ByteCodeIterator codeIterator = new ByteCodeIterator(codes);
+		ClassFile classFile = new ClassFile();
+		//跳过魔数
+		codeIterator.getBytes(4);
+		classFile.setMinorVersion(codeIterator.nextU2ToInt());
+		classFile.setMajorVersion(codeIterator.nextU2ToInt());
+
+		return classFile;
 	}
 
+
 	private AccessFlag parseAccessFlag(ByteCodeIterator iter) {
-
-		return null;
+		//得跳过常量池，常量池的长度是多少？
+		AccessFlag accessFlag = new AccessFlag(iter.nextU2ToInt());
+		return accessFlag;
 	}
 
-	private ClassIndex parseClassInfex(ByteCodeIterator iter) {
+	private ClassIndex parseClassIndex(ByteCodeIterator iter) {
 
 		return null;
 
 	}
 
 	private ConstantPool parseConstantPool(ByteCodeIterator iter) {
-
-		return null;
+		ConstantPool pool = new ConstantPool();
+		ClassInfo classInfo = new ClassInfo(pool);
+		//classInfo tag值
+		iter.nextU1toInt();
+		classInfo.setUtf8Index(iter.nextU2ToInt());
+		pool.addConstantInfo(classInfo);
+
+		UTF8Info utf8Info = new UTF8Info(pool);
+		//UTF8Info tag值
+		iter.nextU1toInt();
+		//UTF8Info length值
+		int length = iter.nextU2ToInt();
+		utf8Info.setLength(length);
+		utf8Info.setValue(iter.nextUxToHexString(length));
+		pool.addConstantInfo(utf8Info);
+
+		classInfo = new ClassInfo(pool);
+		//classInfo tag值
+		iter.nextU1toInt();
+		classInfo.setUtf8Index(iter.nextU2ToInt());
+		pool.addConstantInfo(classInfo);
+
+		for(int i=0;i<8;i++){
+			utf8Info = new UTF8Info(pool);
+			//UTF8Info tag值
+			iter.nextU1toInt();
+			//UTF8Info length值
+			length = iter.nextU2ToInt();
+			utf8Info.setLength(length);
+			utf8Info.setValue(iter.nextUxToHexString(length));
+			pool.addConstantInfo(utf8Info);
+		}
+
+		return pool;
 	}
 
 }

group06/263050006/src/test/java/com/github/chaoswang/learning/java/jvm/ClassFileloaderTest.java

@@ -21,18 +21,19 @@
 public class ClassFileloaderTest {
 
 	private static final String FULL_QUALIFIED_CLASS_NAME = "com/github/chaoswang/learning/java/jvm/EmployeeV1";
-	static String path1 = "E:\\workspace_jee\\coding2017\\target\\test-classes";
+//	static String path1 = "E:\\workspace_jee\\coding2017\\target\\test-classes";
+	static String path1 = "D:\\project\\workspace_1\\d-learning\\target\\test-classes";
 	static String path2 = "C:\temp";
 
 	static ClassFile clzFile = null;
-//	static {
-//		ClassFileLoader loader = new ClassFileLoader();
-//		loader.addClassPath(path1);
-//		String className = "com.github.chaoswang.learning.java.jvm.EmployeeV1";
-//
-//		clzFile = loader.loadClass(className);
-//		clzFile.print();
-//	}
+	static {
+		ClassFileLoader loader = new ClassFileLoader();
+		loader.addClassPath(path1);
+		String className = "com.github.chaoswang.learning.java.jvm.EmployeeV1";
+
+		clzFile = loader.loadClass(className);
+		clzFile.print();
+	}
 
 	@Before
 	public void setUp() throws Exception {