Java Code Examples for jdk.internal.org.objectweb.asm.ClassWriter#visitEnd()
The following examples show how to use
jdk.internal.org.objectweb.asm.ClassWriter#visitEnd() .
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Example 1
| Source File: LambdaAsm.java From openjdk-jdk8u with GNU General Public License v2.0 | 6 votes |
|
static void verifyASM() throws Exception {
ClassWriter cw = new ClassWriter(0);
cw.visit(V1_8, ACC_PUBLIC, "X", null, "java/lang/Object", null);
MethodVisitor mv = cw.visitMethod(ACC_STATIC, "foo",
"()V", null, null);
mv.visitMaxs(2, 1);
mv.visitMethodInsn(INVOKESTATIC,
"java/util/function/Function.class",
"identity", "()Ljava/util/function/Function;", true);
mv.visitInsn(RETURN);
cw.visitEnd();
byte[] carray = cw.toByteArray();
// for debugging
// write((new File("X.class")).toPath(), carray, CREATE, TRUNCATE_EXISTING);
// verify using javap/classfile reader
ClassFile cf = ClassFile.read(new ByteArrayInputStream(carray));
int mcount = checkMethod(cf, "foo");
if (mcount < 1) {
throw new RuntimeException("unexpected method count, expected 1" +
"but got " + mcount);
}
}
Example 2
| Source File: UnsupportedClassFileVersion.java From hottub 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 3
| Source File: LambdaAsm.java From jdk8u-jdk with GNU General Public License v2.0 | 6 votes |
|
static void verifyASM() throws Exception {
ClassWriter cw = new ClassWriter(0);
cw.visit(V1_8, ACC_PUBLIC, "X", null, "java/lang/Object", null);
MethodVisitor mv = cw.visitMethod(ACC_STATIC, "foo",
"()V", null, null);
mv.visitMaxs(2, 1);
mv.visitMethodInsn(INVOKESTATIC,
"java/util/function/Function.class",
"identity", "()Ljava/util/function/Function;", true);
mv.visitInsn(RETURN);
cw.visitEnd();
byte[] carray = cw.toByteArray();
// for debugging
// write((new File("X.class")).toPath(), carray, CREATE, TRUNCATE_EXISTING);
// verify using javap/classfile reader
ClassFile cf = ClassFile.read(new ByteArrayInputStream(carray));
int mcount = checkMethod(cf, "foo");
if (mcount < 1) {
throw new RuntimeException("unexpected method count, expected 1" +
"but got " + mcount);
}
}
Example 4
| Source File: ModuleInfoWriter.java From openjdk-jdk9 with GNU General Public License v2.0 | 5 votes |
|
/**
* Writes the given module descriptor to a module-info.class file,
* returning it in a byte array.
*/
private static byte[] toModuleInfo(ModuleDescriptor md, ModuleTarget target) {
ClassWriter cw = new ClassWriter(0);
cw.visit(Opcodes.V1_9, ACC_MODULE, "module-info", null, null, null);
cw.visitAttribute(new ModuleAttribute(md));
// for tests: write the ModulePackages attribute when there are packages
// that aren't exported or open
Stream<String> exported = md.exports().stream()
.map(ModuleDescriptor.Exports::source);
Stream<String> open = md.opens().stream()
.map(ModuleDescriptor.Opens::source);
long exportedOrOpen = Stream.concat(exported, open).distinct().count();
if (md.packages().size() > exportedOrOpen)
cw.visitAttribute(new ModulePackagesAttribute(md.packages()));
// write ModuleMainClass if the module has a main class
md.mainClass().ifPresent(mc -> cw.visitAttribute(new ModuleMainClassAttribute(mc)));
// write ModuleTarget if there is a target platform
if (target != null) {
cw.visitAttribute(new ModuleTargetAttribute(target.targetPlatform()));
}
cw.visitEnd();
return cw.toByteArray();
}
Example 5
| Source File: EventInstrumentation.java From dragonwell8_jdk with GNU General Public License v2.0 | 5 votes |
|
private byte[] toByteArray() {
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
classNode.accept(cw);
cw.visitEnd();
byte[] result = cw.toByteArray();
Utils.writeGeneratedASM(classNode.name, result);
return result;
}
Example 6
| Source File: OverriderMsg.java From openjdk-jdk9 with GNU General Public License v2.0 | 5 votes |
|
public static void dump_HasFinal () throws Exception {
ClassWriter cw = new ClassWriter(0);
MethodVisitor mv;
cw.visit(V1_7, ACC_PUBLIC + ACC_SUPER, "HasFinal", 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_PUBLIC + ACC_FINAL, "m", "(Ljava/lang/String;)V", null, null);
mv.visitCode();
mv.visitInsn(RETURN);
mv.visitMaxs(0, 2);
mv.visitEnd();
}
cw.visitEnd();
try (FileOutputStream fos = new FileOutputStream(new File("HasFinal.class"))) {
fos.write(cw.toByteArray());
}
}
Example 7
| Source File: TransitiveOverrideCFV50.java From openjdk-jdk9 with GNU General Public License v2.0 | 5 votes |
|
public static byte[] dumpP1A() {
ClassWriter cw = new ClassWriter(0);
MethodVisitor mv;
cw.visit(V1_7, ACC_PUBLIC + ACC_SUPER, "P1/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", 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("A.m");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V", false);
mv.visitIntInsn(BIPUSH, 1);
mv.visitInsn(IRETURN);
mv.visitMaxs(2, 1);
mv.visitEnd();
}
cw.visitEnd();
return cw.toByteArray();
}
Example 8
| Source File: EventInstrumentation.java From TencentKona-8 with GNU General Public License v2.0 | 5 votes |
|
private byte[] toByteArray() {
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
classNode.accept(cw);
cw.visitEnd();
byte[] result = cw.toByteArray();
Utils.writeGeneratedASM(classNode.name, result);
return result;
}
Example 9
| 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 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: LambdaStackTrace.java From openjdk-jdk9 with GNU General Public License v2.0 | 5 votes |
|
private static byte[] generateStringMaker() {
// interface StringMaker extends Maker {
// String make();
// }
ClassWriter cw = new ClassWriter(0);
cw.visit(V1_7, ACC_INTERFACE | ACC_ABSTRACT, "StringMaker", null, "java/lang/Object", new String[]{"Maker"});
cw.visitMethod(ACC_PUBLIC | ACC_ABSTRACT, "make",
"()Ljava/lang/String;", null, null);
cw.visitEnd();
return cw.toByteArray();
}
Example 12
| Source File: JavaAdapterServices.java From openjdk-jdk8u-backup with GNU General Public License v2.0 | 4 votes |
|
private static MethodHandle createNoPermissionsInvoker() {
final String className = "NoPermissionsInvoker";
final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
cw.visit(Opcodes.V1_7, ACC_PUBLIC | ACC_SUPER | ACC_FINAL, className, null, "java/lang/Object", null);
final Type objectType = Type.getType(Object.class);
final Type methodHandleType = Type.getType(MethodHandle.class);
final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "invoke",
Type.getMethodDescriptor(Type.VOID_TYPE, methodHandleType, objectType), null, null));
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.invokevirtual(methodHandleType.getInternalName(), "invokeExact", Type.getMethodDescriptor(
Type.VOID_TYPE, objectType), false);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
cw.visitEnd();
final byte[] bytes = cw.toByteArray();
final ClassLoader loader = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
@Override
public ClassLoader run() {
return new SecureClassLoader(null) {
@Override
protected Class<?> findClass(final String name) throws ClassNotFoundException {
if(name.equals(className)) {
return defineClass(name, bytes, 0, bytes.length, new ProtectionDomain(
new CodeSource(null, (CodeSigner[])null), new Permissions()));
}
throw new ClassNotFoundException(name);
}
};
}
});
try {
return MethodHandles.lookup().findStatic(Class.forName(className, true, loader), "invoke",
MethodType.methodType(void.class, MethodHandle.class, Object.class));
} catch(final ReflectiveOperationException e) {
throw new AssertionError(e.getMessage(), e);
}
}
Example 13
| Source File: FinalStatic.java From hottub 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 14
| Source File: TestAMEnotNPE.java From hottub with GNU General Public License v2.0 | 4 votes |
|
/**
* The bytecodes for a class p/T defining a methods test() and test(11args)
* that contain an invokeExact of a particular methodHandle, I.m.
*
* Test will be passed values that may imperfectly implement I,
* and thus may in turn throw exceptions.
*
* @return
* @throws Exception
*/
public static byte[] bytesForT() throws Exception {
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES
| ClassWriter.COMPUTE_MAXS);
MethodVisitor mv;
cw.visit(V1_8, ACC_PUBLIC + ACC_SUPER, "p/T", 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(0, 0);
mv.visitEnd();
}
// static int test(I)
{
mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "test", "(Lp/I;)I", null, null);
mv.visitCode();
mv.visitLdcInsn(new Handle(Opcodes.H_INVOKEINTERFACE, "p/I", "m", "()I"));
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/invoke/MethodHandle",
"invokeExact", "(Lp/I;)I");
mv.visitInsn(IRETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
// static int test(I,11args)
{
mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "test", "(Lp/I;BCSIJLjava/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 Handle(Opcodes.H_INVOKEINTERFACE, "p/I", "m", "(BCSIJLjava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)I"));
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ILOAD, 1);
mv.visitVarInsn(ILOAD, 2);
mv.visitVarInsn(ILOAD, 3);
mv.visitVarInsn(ILOAD, 4);
mv.visitVarInsn(LLOAD, 5);
mv.visitVarInsn(ALOAD, 7);
mv.visitVarInsn(ALOAD, 8);
mv.visitVarInsn(ALOAD, 9);
mv.visitVarInsn(ALOAD, 10);
mv.visitVarInsn(ALOAD, 11);
mv.visitVarInsn(ALOAD, 12);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/invoke/MethodHandle",
"invokeExact", "(Lp/I;BCSIJLjava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)I");
mv.visitInsn(IRETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
cw.visitEnd();
return cw.toByteArray();
}
Example 15
| Source File: JavaAdapterServices.java From jdk8u_nashorn with GNU General Public License v2.0 | 4 votes |
|
private static MethodHandle createNoPermissionsInvoker() {
final String className = "NoPermissionsInvoker";
final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
cw.visit(Opcodes.V1_7, ACC_PUBLIC | ACC_SUPER | ACC_FINAL, className, null, "java/lang/Object", null);
final Type objectType = Type.getType(Object.class);
final Type methodHandleType = Type.getType(MethodHandle.class);
final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "invoke",
Type.getMethodDescriptor(Type.VOID_TYPE, methodHandleType, objectType), null, null));
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.invokevirtual(methodHandleType.getInternalName(), "invokeExact", Type.getMethodDescriptor(
Type.VOID_TYPE, objectType), false);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
cw.visitEnd();
final byte[] bytes = cw.toByteArray();
final ClassLoader loader = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
@Override
public ClassLoader run() {
return new SecureClassLoader(null) {
@Override
protected Class<?> findClass(final String name) throws ClassNotFoundException {
if(name.equals(className)) {
return defineClass(name, bytes, 0, bytes.length, new ProtectionDomain(
new CodeSource(null, (CodeSigner[])null), new Permissions()));
}
throw new ClassNotFoundException(name);
}
};
}
});
try {
return MethodHandles.lookup().findStatic(Class.forName(className, true, loader), "invoke",
MethodType.methodType(void.class, MethodHandle.class, Object.class));
} catch(final ReflectiveOperationException e) {
throw new AssertionError(e.getMessage(), e);
}
}
Example 16
| Source File: TestConcreteClassWithAbstractMethod.java From TencentKona-8 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 17
| Source File: TestAMEnotNPE.java From openjdk-8-source 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 TencentKona-8 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: JavaAdapterServices.java From openjdk-jdk8u with GNU General Public License v2.0 | 4 votes |
|
private static MethodHandle createNoPermissionsInvoker() {
final String className = "NoPermissionsInvoker";
final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
cw.visit(Opcodes.V1_7, ACC_PUBLIC | ACC_SUPER | ACC_FINAL, className, null, "java/lang/Object", null);
final Type objectType = Type.getType(Object.class);
final Type methodHandleType = Type.getType(MethodHandle.class);
final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "invoke",
Type.getMethodDescriptor(Type.VOID_TYPE, methodHandleType, objectType), null, null));
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.invokevirtual(methodHandleType.getInternalName(), "invokeExact", Type.getMethodDescriptor(
Type.VOID_TYPE, objectType), false);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
cw.visitEnd();
final byte[] bytes = cw.toByteArray();
final ClassLoader loader = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
@Override
public ClassLoader run() {
return new SecureClassLoader(null) {
@Override
protected Class<?> findClass(final String name) throws ClassNotFoundException {
if(name.equals(className)) {
return defineClass(name, bytes, 0, bytes.length, new ProtectionDomain(
new CodeSource(null, (CodeSigner[])null), new Permissions()));
}
throw new ClassNotFoundException(name);
}
};
}
});
try {
return MethodHandles.lookup().findStatic(Class.forName(className, true, loader), "invoke",
MethodType.methodType(void.class, MethodHandle.class, Object.class));
} catch(final ReflectiveOperationException e) {
throw new AssertionError(e.getMessage(), e);
}
}
Example 20
| Source File: TestAMEnotNPE.java From openjdk-jdk8u 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();
}
