Java Code Examples for jdk.internal.org.objectweb.asm.MethodVisitor#visitVarInsn()
The following examples show how to use
jdk.internal.org.objectweb.asm.MethodVisitor#visitVarInsn() .
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Example 1
| Source File: UnsupportedClassFileVersion.java From openjdk-jdk8u-backup with GNU General Public License v2.0 | 6 votes |
|
public static void writeClassFile() throws Exception {
ClassWriter cw = new ClassWriter(0);
MethodVisitor mv;
cw.visit(99, ACC_PUBLIC + ACC_SUPER, "ClassFile", null, "java/lang/Object", null);
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
cw.visitEnd();
try (FileOutputStream fos = new FileOutputStream(new File("ClassFile.class"))) {
fos.write(cw.toByteArray());
}
}
Example 2
| Source File: Proxy.java From totallylazy with Apache License 2.0 | 6 votes |
|
private static void loadArguments(MethodVisitor mv, Method method) {
int arguments = method.getParameterCount();
mv.visitLdcInsn(arguments);
mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
Class<?>[] parameterTypes = method.getParameterTypes();
for (int i = 0, local = 0; i < parameterTypes.length; i++) {
Class<?> parameterType = parameterTypes[i];
local++;
mv.visitInsn(DUP);
mv.visitLdcInsn(i);
mv.visitVarInsn(Asm.load(parameterType), local);
if (parameterType.isPrimitive() && !parameterType.equals(void.class)) {
String internalName = Type.getInternalName(Reflection.box(parameterType));
mv.visitMethodInsn(INVOKESTATIC, internalName, "valueOf", format("(%s)L%s;", Type.getDescriptor(parameterType), internalName), false);
}
if (parameterType.equals(double.class) || parameterType.equals(long.class)) local++;
mv.visitInsn(AASTORE);
}
}
Example 3
| Source File: AddressVarHandleGenerator.java From Bytecoder with Apache License 2.0 | 6 votes |
|
void addStridesAccessor(BinderClassWriter cw) {
MethodVisitor mv = cw.visitMethod(ACC_FINAL, "strides", "()[J", null, null);
mv.visitCode();
iConstInsn(mv, dimensions);
mv.visitIntInsn(NEWARRAY, T_LONG);
for (int i = 0 ; i < dimensions ; i++) {
mv.visitInsn(DUP);
iConstInsn(mv, i);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, implClassName, "dim" + i, "J");
mv.visitInsn(LASTORE);
}
mv.visitInsn(ARETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
Example 4
| Source File: DefineClassTest.java From openjdk-jdk9 with GNU General Public License v2.0 | 5 votes |
|
/**
* Generate a class file with the given class name. The class implements Runnable
* with a run method to invokestatic the given targetClass/targetMethod.
*/
byte[] generateRunner(String className,
String targetClass,
String targetMethod) throws Exception {
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS
+ ClassWriter.COMPUTE_FRAMES);
cw.visit(V1_9,
ACC_PUBLIC + ACC_SUPER,
className.replace(".", "/"),
null,
"java/lang/Object",
new String[] { "java/lang/Runnable" });
// <init>
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
// run()
String tc = targetClass.replace(".", "/");
mv = cw.visitMethod(ACC_PUBLIC, "run", "()V", null, null);
mv.visitMethodInsn(INVOKESTATIC, tc, targetMethod, "()V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
cw.visitEnd();
return cw.toByteArray();
}
Example 5
| Source File: EventHandlerProxyCreator.java From TencentKona-8 with GNU General Public License v2.0 | 5 votes |
|
private static void buildDurationMethod() {
MethodVisitor mv = classWriter.visitMethod(Opcodes.ACC_PUBLIC + Opcodes.ACC_STATIC, METHOD_DURATION.getName(), METHOD_DURATION.getDescriptor(), null, null);
mv.visitCode();
mv.visitVarInsn(Opcodes.LLOAD, 0);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(EventHandler.class), METHOD_DURATION.getName(), METHOD_DURATION.getDescriptor(), false);
mv.visitInsn(Opcodes.LRETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
Example 6
| Source File: BoundMethodHandle.java From openjdk-8 with GNU General Public License v2.0 | 5 votes |
|
private static void emitPushFields(String types, String className, MethodVisitor mv) {
for (int i = 0; i < types.length(); ++i) {
char tc = types.charAt(i);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, className, makeFieldName(types, i), typeSig(tc));
}
}
Example 7
| Source File: BoundMethodHandle.java From TencentKona-8 with GNU General Public License v2.0 | 5 votes |
|
private static void emitPushFields(String types, String className, MethodVisitor mv) {
for (int i = 0; i < types.length(); ++i) {
char tc = types.charAt(i);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, className, makeFieldName(types, i), typeSig(tc));
}
}
Example 8
| Source File: TestPrivateInterfaceMethodReflect.java From jdk8u_jdk with GNU General Public License v2.0 | 5 votes |
|
private byte[] loadClassData(String name) throws Exception {
ClassWriter cw = new ClassWriter(0);
MethodVisitor mv;
switch (name) {
case INTERFACE_NAME:
cw.visit(V1_8, ACC_ABSTRACT | ACC_INTERFACE | ACC_PUBLIC, INTERFACE_NAME, null, "java/lang/Object", null);
{
mv = cw.visitMethod(ACC_PRIVATE, "privInstance", "()I", null, null);
mv.visitCode();
mv.visitLdcInsn(EXPECTED);
mv.visitInsn(IRETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
break;
case CLASS_NAME:
cw.visit(52, ACC_SUPER | ACC_PUBLIC, CLASS_NAME, null, "java/lang/Object", new String[]{INTERFACE_NAME});
{
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
mv.visitInsn(RETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
break;
default:
break;
}
cw.visitEnd();
return cw.toByteArray();
}
Example 9
| Source File: TestMultiANewArray.java From openjdk-jdk8u with GNU General Public License v2.0 | 5 votes |
|
public static void writeClassFile(int cfv) throws Exception {
ClassWriter cw = new ClassWriter(0);
MethodVisitor mv;
cw.visit(cfv, ACC_PUBLIC + ACC_SUPER, "ClassFile", null, "java/lang/Object", null);
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "main", "([Ljava/lang/String;)V", null, null);
mv.visitCode();
mv.visitInsn(ICONST_1);
mv.visitInsn(ICONST_2);
mv.visitMultiANewArrayInsn("[I", 2);
mv.visitVarInsn(ASTORE, 1);
mv.visitInsn(RETURN);
mv.visitMaxs(2, 2);
mv.visitEnd();
cw.visitEnd();
try (FileOutputStream fos = new FileOutputStream(new File("ClassFile.class"))) {
fos.write(cw.toByteArray());
}
}
Example 10
| Source File: TestPrivateInterfaceMethodReflect.java From openjdk-jdk8u with GNU General Public License v2.0 | 5 votes |
|
private byte[] loadClassData(String name) throws Exception {
ClassWriter cw = new ClassWriter(0);
MethodVisitor mv;
switch (name) {
case INTERFACE_NAME:
cw.visit(V1_8, ACC_ABSTRACT | ACC_INTERFACE | ACC_PUBLIC, INTERFACE_NAME, null, "java/lang/Object", null);
{
mv = cw.visitMethod(ACC_PRIVATE, "privInstance", "()I", null, null);
mv.visitCode();
mv.visitLdcInsn(EXPECTED);
mv.visitInsn(IRETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
break;
case CLASS_NAME:
cw.visit(52, ACC_SUPER | ACC_PUBLIC, CLASS_NAME, null, "java/lang/Object", new String[]{INTERFACE_NAME});
{
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
mv.visitInsn(RETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
break;
default:
break;
}
cw.visitEnd();
return cw.toByteArray();
}
Example 11
| Source File: BoundMethodHandle.java From Java8CN with Apache License 2.0 | 5 votes |
|
private static void emitPushFields(String types, String className, MethodVisitor mv) {
for (int i = 0; i < types.length(); ++i) {
char tc = types.charAt(i);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, className, makeFieldName(types, i), typeSig(tc));
}
}
Example 12
| Source File: TestPrivateInterfaceMethodReflect.java From openjdk-8-source with GNU General Public License v2.0 | 5 votes |
|
private byte[] loadClassData(String name) throws Exception {
ClassWriter cw = new ClassWriter(0);
MethodVisitor mv;
switch (name) {
case INTERFACE_NAME:
cw.visit(V1_8, ACC_ABSTRACT | ACC_INTERFACE | ACC_PUBLIC, INTERFACE_NAME, null, "java/lang/Object", null);
{
mv = cw.visitMethod(ACC_PRIVATE, "privInstance", "()I", null, null);
mv.visitCode();
mv.visitLdcInsn(EXPECTED);
mv.visitInsn(IRETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
break;
case CLASS_NAME:
cw.visit(52, ACC_SUPER | ACC_PUBLIC, CLASS_NAME, null, "java/lang/Object", new String[]{INTERFACE_NAME});
{
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
mv.visitInsn(RETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
break;
default:
break;
}
cw.visitEnd();
return cw.toByteArray();
}
Example 13
| Source File: UnloadClass.java From LearningOfThinkInJava with Apache License 2.0 | 5 votes |
|
public static void main(String[] args) throws NoSuchMethodException,SecurityException,
IllegalAccessException,IllegalArgumentException,InvocationTargetException{
ClassWriter cw=new ClassWriter(ClassWriter.COMPUTE_MAXS|ClassWriter.COMPUTE_FRAMES);
cw.visit(V1_7,ACC_PUBLIC,"Example",null,"java/lang/Object",null);
MethodVisitor mw=cw.visitMethod(ACC_PUBLIC,"<init>","()V",null,null);
mw.visitVarInsn(ALOAD,0);
mw.visitMethodInsn(INVOKESPECIAL,"java/lang/Object","<init>","()V");
mw.visitInsn(RETURN);
mw.visitMaxs(0,0);
mw.visitEnd();
mw=cw.visitMethod(ACC_PUBLIC+ACC_STATIC,"main","([Ljava/lang/String;)V",null,null);
mw.visitFieldInsn(GETSTATIC,"java/lang/System","out","Ljava/io/PrintStream;");
mw.visitLdcInsn("Hello world!");
mw.visitMethodInsn(INVOKEVIRTUAL,"java/io/PrintStream","println","(Ljava/lang/String;)V");
mw.visitInsn(RETURN);
mw.visitMaxs(0,0);
mw.visitEnd();
byte[] code=cw.toByteArray();
for(int i=0;i<1;i++){
ClassLoader loader=UnloadClass.class.getClassLoader();
Method m=ClassLoader.class.getDeclaredMethod("defineClass", String.class, byte[].class, int.class, int.class);
m.setAccessible(true);
m.invoke(loader,"Example",code,0,code.length);
m.setAccessible(false);
System.gc();
}
}
Example 14
| Source File: MethodHandleImpl.java From openjdk-jdk9 with GNU General Public License v2.0 | 5 votes |
|
/** Produces byte code for a class that is used as an injected invoker. */
private static byte[] generateInvokerTemplate() {
ClassWriter cw = new ClassWriter(0);
// private static class InjectedInvoker {
// @Hidden
// static Object invoke_V(MethodHandle vamh, Object[] args) throws Throwable {
// return vamh.invokeExact(args);
// }
// }
cw.visit(52, ACC_PRIVATE | ACC_SUPER, "InjectedInvoker", null, "java/lang/Object", null);
MethodVisitor mv = cw.visitMethod(ACC_STATIC, "invoke_V",
"(Ljava/lang/invoke/MethodHandle;[Ljava/lang/Object;)Ljava/lang/Object;",
null, null);
// Suppress invoker method in stack traces.
AnnotationVisitor av0 = mv.visitAnnotation("Ljava/lang/invoke/LambdaForm$Hidden;", true);
av0.visitEnd();
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/invoke/MethodHandle", "invokeExact",
"([Ljava/lang/Object;)Ljava/lang/Object;", false);
mv.visitInsn(ARETURN);
mv.visitMaxs(2, 2);
mv.visitEnd();
cw.visitEnd();
return cw.toByteArray();
}
Example 15
| Source File: TestConcreteClassWithAbstractMethod.java From openjdk-jdk8u-backup with GNU General Public License v2.0 | 4 votes |
|
public static byte[] dumpT3() {
ClassWriter cw = new ClassWriter(0);
MethodVisitor mv;
cw.visit(52, ACC_PUBLIC + ACC_SUPER, "p1/T3", null, "p1/T2", null);
{
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "p1/T2", "<init>", "()V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
{
mv = cw.visitMethod(ACC_PUBLIC, "m", "()I", null, null);
mv.visitCode();
mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
mv.visitLdcInsn("p1/T3.m()");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "print", "(Ljava/lang/String;)V", false);
mv.visitIntInsn(BIPUSH, 2);
mv.visitInsn(IRETURN);
mv.visitMaxs(2, 1);
mv.visitEnd();
}
{
mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "test", "()I", null, null);
mv.visitCode();
mv.visitTypeInsn(NEW, "p1/T3");
mv.visitInsn(DUP);
mv.visitMethodInsn(INVOKESPECIAL, "p1/T3", "<init>", "()V", false);
mv.visitMethodInsn(INVOKEVIRTUAL, "p1/T2", "m", "()I", false);
mv.visitInsn(IRETURN);
mv.visitMaxs(3, 2);
mv.visitEnd();
}
cw.visitEnd();
return cw.toByteArray();
}
Example 16
| Source File: VarInsnNode.java From openjdk-jdk8u-backup with GNU General Public License v2.0 | 4 votes |
|
@Override
public void accept(final MethodVisitor mv) {
mv.visitVarInsn(opcode, var);
acceptAnnotations(mv);
}
Example 17
| Source File: TestAMEnotNPE.java From TencentKona-8 with GNU General Public License v2.0 | 4 votes |
|
/**
* Returns the bytes for a class with name d_name (presumably "D" in some
* package), extending some class with name sub_what, implementing p.I,
* and defining two methods m() and m(11args) with access method_acc.
*
* @param d_name Name of class that is defined
* @param sub_what Name of class that it extends
* @param method_acc Accessibility of method(s) m in defined class.
* @return
* @throws Exception
*/
public static byte[] bytesForSomeDsubSomethingSomeAccess
(String d_name, String sub_what, int method_acc)
throws Exception {
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES
| ClassWriter.COMPUTE_MAXS);
MethodVisitor mv;
String[] interfaces = {"p/I"};
cw.visit(V1_8, ACC_PUBLIC + ACC_SUPER, d_name, null, sub_what, interfaces);
{
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, sub_what, "<init>", "()V");
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
// int m() {return 3;}
{
mv = cw.visitMethod(method_acc, "m", "()I", null, null);
mv.visitCode();
mv.visitLdcInsn(new Integer(3));
mv.visitInsn(IRETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
// int m(11args) {return 3;}
{
mv = cw.visitMethod(method_acc, "m", "(BCSIJ"
+ "Ljava/lang/Object;"
+ "Ljava/lang/Object;"
+ "Ljava/lang/Object;"
+ "Ljava/lang/Object;"
+ "Ljava/lang/Object;"
+ "Ljava/lang/Object;"
+ ")I", null, null);
mv.visitCode();
mv.visitLdcInsn(new Integer(3));
mv.visitInsn(IRETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
cw.visitEnd();
return cw.toByteArray();
}
Example 18
| Source File: FinalStatic.java From openjdk-jdk8u with GNU General Public License v2.0 | 4 votes |
|
private byte[] loadClassData(String name) throws Exception {
ClassWriter cw = new ClassWriter(0);
MethodVisitor mv;
switch (name) {
case CLASS_NAME_A:
cw.visit(52, ACC_SUPER | ACC_PUBLIC, CLASS_NAME_A, null, "java/lang/Object", null);
{
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
mv.visitInsn(RETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
mv = cw.visitMethod(ACC_FINAL | ACC_STATIC, "m", "()I", null, null);
mv.visitCode();
mv.visitLdcInsn(FAILED);
mv.visitInsn(IRETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
break;
case CLASS_NAME_B:
cw.visit(52, ACC_SUPER | ACC_PUBLIC, CLASS_NAME_B, null, CLASS_NAME_A, null);
{
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, CLASS_NAME_A, "<init>", "()V");
mv.visitInsn(RETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
mv = cw.visitMethod(ACC_PUBLIC, "m", "()I", null, null);
mv.visitCode();
mv.visitLdcInsn(EXPECTED);
mv.visitInsn(IRETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
break;
default:
break;
}
cw.visitEnd();
return cw.toByteArray();
}
Example 19
| Source File: VarInsnNode.java From openjdk-8-source with GNU General Public License v2.0 | 4 votes |
|
@Override
public void accept(final MethodVisitor mv) {
mv.visitVarInsn(opcode, var);
acceptAnnotations(mv);
}
Example 20
| Source File: VarInsnNode.java From openjdk-jdk8u with GNU General Public License v2.0 | 4 votes |
|
@Override
public void accept(final MethodVisitor mv) {
mv.visitVarInsn(opcode, var);
acceptAnnotations(mv);
}
