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 Project: totallylazy File: Proxy.java License: 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 2
Source Project: Bytecoder File: AddressVarHandleGenerator.java License: 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 3
Source Project: openjdk-jdk8u-backup File: UnsupportedClassFileVersion.java License: 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 4
Source Project: openjdk-jdk8u File: TestMultiANewArray.java License: 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 5
Source Project: openjdk-jdk9 File: MethodHandleImpl.java License: 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 6
Source Project: LearningOfThinkInJava File: UnloadClass.java License: 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 7
Source Project: openjdk-8-source File: TestPrivateInterfaceMethodReflect.java License: 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 8
Source Project: Java8CN File: BoundMethodHandle.java License: 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 9
Source Project: openjdk-jdk8u File: TestPrivateInterfaceMethodReflect.java License: 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 10
Source Project: openjdk-jdk9 File: DefineClassTest.java License: 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 11
Source Project: jdk8u_jdk File: TestPrivateInterfaceMethodReflect.java License: 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 12
Source Project: TencentKona-8 File: BoundMethodHandle.java License: 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 13
Source Project: openjdk-8 File: BoundMethodHandle.java License: 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 14
Source Project: TencentKona-8 File: EventHandlerProxyCreator.java License: 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 15
Source Project: openjdk-jdk8u File: VarInsnNode.java License: GNU General Public License v2.0 | 4 votes |
@Override public void accept(final MethodVisitor mv) { mv.visitVarInsn(opcode, var); acceptAnnotations(mv); }
Example 16
Source Project: openjdk-8-source File: VarInsnNode.java License: GNU General Public License v2.0 | 4 votes |
@Override public void accept(final MethodVisitor mv) { mv.visitVarInsn(opcode, var); acceptAnnotations(mv); }
Example 17
Source Project: openjdk-jdk8u-backup File: TestConcreteClassWithAbstractMethod.java License: 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 18
Source Project: openjdk-jdk8u-backup File: VarInsnNode.java License: GNU General Public License v2.0 | 4 votes |
@Override public void accept(final MethodVisitor mv) { mv.visitVarInsn(opcode, var); acceptAnnotations(mv); }
Example 19
Source Project: TencentKona-8 File: TestAMEnotNPE.java License: 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 20
Source Project: openjdk-jdk8u File: FinalStatic.java License: 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(); }