Java Code Examples for jdk.internal.org.objectweb.asm.MethodVisitor#visitEnd()
The following examples show how to use
jdk.internal.org.objectweb.asm.MethodVisitor#visitEnd() .
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Example 1
Source Project: Bytecoder File: AddressVarHandleGenerator.java License: Apache License 2.0 | 6 votes |
void addConstructor(BinderClassWriter cw) { MethodType constrType = MethodType.methodType(void.class, VarForm.class, boolean.class, long.class, long.class, long.class, long[].class); MethodVisitor mv = cw.visitMethod(0, "<init>", constrType.toMethodDescriptorString(), null, null); mv.visitCode(); //super call mv.visitVarInsn(ALOAD, 0); mv.visitVarInsn(ALOAD, 1); mv.visitTypeInsn(CHECKCAST, Type.getInternalName(VarForm.class)); mv.visitVarInsn(ILOAD, 2); mv.visitVarInsn(LLOAD, 3); mv.visitVarInsn(LLOAD, 5); mv.visitVarInsn(LLOAD, 7); mv.visitMethodInsn(INVOKESPECIAL, Type.getInternalName(BASE_CLASS), "<init>", MethodType.methodType(void.class, VarForm.class, boolean.class, long.class, long.class, long.class).toMethodDescriptorString(), false); //init dimensions for (int i = 0 ; i < dimensions ; i++) { mv.visitVarInsn(ALOAD, 0); mv.visitVarInsn(ALOAD, 9); mv.visitLdcInsn(i); mv.visitInsn(LALOAD); mv.visitFieldInsn(PUTFIELD, implClassName, "dim" + i, "J"); } mv.visitInsn(RETURN); mv.visitMaxs(0, 0); mv.visitEnd(); }
Example 2
Source Project: jdk8u60 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 3
Source Project: openjdk-8-source File: TestAMEnotNPE.java License: GNU General Public License v2.0 | 6 votes |
/** * The bytes for D, a NOT abstract class extending abstract class C without * supplying an implementation for abstract method m. There is a default * method in the interface I, but it should lose to the abstract class. * * @return * @throws Exception */ public static byte[] bytesForD() throws Exception { ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS); MethodVisitor mv; cw.visit(V1_8, ACC_PUBLIC + ACC_SUPER, "p/D", null, "p/C", null); { mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null); mv.visitCode(); mv.visitVarInsn(ALOAD, 0); mv.visitMethodInsn(INVOKESPECIAL, "p/C", "<init>", "()V"); mv.visitInsn(RETURN); mv.visitMaxs(0, 0); mv.visitEnd(); } cw.visitEnd(); return cw.toByteArray(); }
Example 4
Source Project: openjdk-jdk8u File: TestAMEnotNPE.java License: GNU General Public License v2.0 | 6 votes |
/** * The bytes for D, a NOT abstract class extending abstract class C without * supplying an implementation for abstract method m. There is a default * method in the interface I, but it should lose to the abstract class. * * @return * @throws Exception */ public static byte[] bytesForD() throws Exception { ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS); MethodVisitor mv; cw.visit(V1_8, ACC_PUBLIC + ACC_SUPER, "p/D", null, "p/C", null); { mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null); mv.visitCode(); mv.visitVarInsn(ALOAD, 0); mv.visitMethodInsn(INVOKESPECIAL, "p/C", "<init>", "()V"); mv.visitInsn(RETURN); mv.visitMaxs(0, 0); mv.visitEnd(); } cw.visitEnd(); return cw.toByteArray(); }
Example 5
Source Project: jdk8u60 File: TestAMEnotNPE.java License: GNU General Public License v2.0 | 6 votes |
/** * The bytes for D, a NOT abstract class extending abstract class C without * supplying an implementation for abstract method m. There is a default * method in the interface I, but it should lose to the abstract class. * * @return * @throws Exception */ public static byte[] bytesForD() throws Exception { ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS); MethodVisitor mv; cw.visit(V1_8, ACC_PUBLIC + ACC_SUPER, "p/D", null, "p/C", null); { mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null); mv.visitCode(); mv.visitVarInsn(ALOAD, 0); mv.visitMethodInsn(INVOKESPECIAL, "p/C", "<init>", "()V"); mv.visitInsn(RETURN); mv.visitMaxs(0, 0); mv.visitEnd(); } cw.visitEnd(); return cw.toByteArray(); }
Example 6
Source Project: openjdk-jdk9 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 7
Source Project: dragonwell8_jdk File: EventHandlerCreator.java License: GNU General Public License v2.0 | 5 votes |
private void buildConstructor() { MethodVisitor mv = classWriter.visitMethod(Opcodes.ACC_PRIVATE, METHOD_EVENT_HANDLER_CONSTRUCTOR.getName(), makeConstructorDescriptor(settingInfos), null, null); mv.visitVarInsn(Opcodes.ALOAD, 0); // this mv.visitVarInsn(Opcodes.ILOAD, 1); // registered mv.visitVarInsn(Opcodes.ALOAD, 2); // event type mv.visitVarInsn(Opcodes.ALOAD, 3); // event control mv.visitMethodInsn(Opcodes.INVOKESPECIAL, Type.getInternalName(EventHandler.class), METHOD_EVENT_HANDLER_CONSTRUCTOR.getName(), METHOD_EVENT_HANDLER_CONSTRUCTOR.getDescriptor(), false); for (SettingInfo si : settingInfos) { mv.visitVarInsn(Opcodes.ALOAD, 0); // this mv.visitVarInsn(Opcodes.ALOAD, si.index + 4); // Setting Control mv.visitFieldInsn(Opcodes.PUTFIELD, internalClassName, si.fieldName, TYPE_SETTING_CONTROL.getDescriptor()); } // initialized string field writers int fieldIndex = 0; for (FieldInfo field : fields) { if (field.isString()) { mv.visitVarInsn(Opcodes.ALOAD, 0); mv.visitVarInsn(Opcodes.ALOAD, 0); mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(EventHandler.class), "createStringFieldWriter", "()" + TYPE_STRING_POOL.getDescriptor(), false); mv.visitFieldInsn(Opcodes.PUTFIELD, internalClassName, FIELD_PREFIX_STRING_POOL + fieldIndex, TYPE_STRING_POOL.getDescriptor()); } fieldIndex++; } mv.visitInsn(Opcodes.RETURN); mv.visitMaxs(0, 0); mv.visitEnd(); }
Example 8
Source Project: openjdk-jdk9 File: SystemModulesPlugin.java License: GNU General Public License v2.0 | 5 votes |
/** * Generate bytecode for SystemModules::methodResoultions method */ private void genModuleResolutionsMethod() { MethodVisitor mresmv = cw.visitMethod(ACC_PUBLIC+ACC_STATIC, "moduleResolutions", "()" + MODULE_RESOLUTIONS_ARRAY_SIGNATURE, "()" + MODULE_RESOLUTIONS_ARRAY_SIGNATURE, null); mresmv.visitCode(); pushInt(mresmv, moduleInfos.size()); mresmv.visitTypeInsn(ANEWARRAY, MODULE_RESOLUTION_CLASSNAME); mresmv.visitVarInsn(ASTORE, 0); for (int index=0; index < moduleInfos.size(); index++) { ModuleInfo minfo = moduleInfos.get(index); if (minfo.moduleResolution() != null) { mresmv.visitVarInsn(ALOAD, 0); pushInt(mresmv, index); mresmv.visitTypeInsn(NEW, MODULE_RESOLUTION_CLASSNAME); mresmv.visitInsn(DUP); mresmv.visitLdcInsn(minfo.moduleResolution().value()); mresmv.visitMethodInsn(INVOKESPECIAL, MODULE_RESOLUTION_CLASSNAME, "<init>", "(I)V", false); mresmv.visitInsn(AASTORE); } } mresmv.visitVarInsn(ALOAD, 0); mresmv.visitInsn(ARETURN); mresmv.visitMaxs(0, 0); mresmv.visitEnd(); }
Example 9
Source Project: openjdk-jdk8u File: EventHandlerCreator.java License: GNU General Public License v2.0 | 5 votes |
private void buildConstructor() { MethodVisitor mv = classWriter.visitMethod(Opcodes.ACC_PRIVATE, METHOD_EVENT_HANDLER_CONSTRUCTOR.getName(), makeConstructorDescriptor(settingInfos), null, null); mv.visitVarInsn(Opcodes.ALOAD, 0); // this mv.visitVarInsn(Opcodes.ILOAD, 1); // registered mv.visitVarInsn(Opcodes.ALOAD, 2); // event type mv.visitVarInsn(Opcodes.ALOAD, 3); // event control mv.visitMethodInsn(Opcodes.INVOKESPECIAL, Type.getInternalName(eventHandlerProxy), METHOD_EVENT_HANDLER_CONSTRUCTOR.getName(), METHOD_EVENT_HANDLER_CONSTRUCTOR.getDescriptor(), false); for (SettingInfo si : settingInfos) { mv.visitVarInsn(Opcodes.ALOAD, 0); // this mv.visitVarInsn(Opcodes.ALOAD, si.index + 4); // Setting Control mv.visitFieldInsn(Opcodes.PUTFIELD, internalClassName, si.fieldName, TYPE_SETTING_CONTROL.getDescriptor()); } // initialized string field writers int fieldIndex = 0; for (FieldInfo field : fields) { if (field.isString()) { mv.visitVarInsn(Opcodes.ALOAD, 0); mv.visitVarInsn(Opcodes.ALOAD, 0); mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(eventHandlerProxy), "createStringFieldWriter", "()" + TYPE_STRING_POOL.getDescriptor(), false); mv.visitFieldInsn(Opcodes.PUTFIELD, internalClassName, FIELD_PREFIX_STRING_POOL + fieldIndex, TYPE_STRING_POOL.getDescriptor()); } fieldIndex++; } mv.visitInsn(Opcodes.RETURN); mv.visitMaxs(0, 0); mv.visitEnd(); }
Example 10
Source Project: TencentKona-8 File: BootstrapMethodErrorTest.java License: GNU General Public License v2.0 | 5 votes |
private byte[] loadClassData(String name) throws Exception { ClassWriter cw = new ClassWriter(0); MethodVisitor mv; if (name.equals("C")) { cw.visit(52, ACC_SUPER | ACC_PUBLIC, "C", null, "java/lang/Object", null); { mv = cw.visitMethod(ACC_PRIVATE | ACC_STATIC, "m", "()V", null, null); mv.visitCode(); mv.visitInsn(RETURN); mv.visitMaxs(0, 1); mv.visitEnd(); } cw.visitEnd(); return cw.toByteArray(); } else if (name.equals("Exec")) { cw.visit(52, ACC_SUPER | ACC_PUBLIC, "Exec", null, "java/lang/Object", null); { mv = cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "invokeRef", "()V", null, null); mv.visitCode(); Handle h = new Handle(H_INVOKESTATIC, "C", "m", "()V"); mv.visitInvokeDynamicInsn("C", "()V", h); mv.visitInsn(RETURN); mv.visitMaxs(0, 0); mv.visitEnd(); } cw.visitEnd(); return cw.toByteArray(); } return null; }
Example 11
Source Project: openjdk-jdk8u 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 12
Source Project: openjdk-jdk9 File: SystemModulesPlugin.java License: GNU General Public License v2.0 | 5 votes |
/** * Generate bytecode for SystemModules::targets method */ private void genTargetsMethod() { MethodVisitor mv = cw.visitMethod(ACC_PUBLIC+ACC_STATIC, "targets", "()" + MODULE_TARGET_ARRAY_SIGNATURE, "()" + MODULE_TARGET_ARRAY_SIGNATURE, null); mv.visitCode(); pushInt(mv, moduleInfos.size()); mv.visitTypeInsn(ANEWARRAY, MODULE_TARGET_CLASSNAME); mv.visitVarInsn(ASTORE, MT_VAR); for (int index=0; index < moduleInfos.size(); index++) { ModuleInfo minfo = moduleInfos.get(index); if (minfo.target() != null && !minfo.dropModuleTarget) { mv.visitVarInsn(ALOAD, MT_VAR); pushInt(mv, index); // new ModuleTarget(String, String) mv.visitTypeInsn(NEW, MODULE_TARGET_CLASSNAME); mv.visitInsn(DUP); mv.visitLdcInsn(minfo.target().targetPlatform()); mv.visitMethodInsn(INVOKESPECIAL, MODULE_TARGET_CLASSNAME, "<init>", "(Ljava/lang/String;)V", false); mv.visitInsn(AASTORE); } } mv.visitVarInsn(ALOAD, MT_VAR); mv.visitInsn(ARETURN); mv.visitMaxs(0, 0); mv.visitEnd(); }
Example 13
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 14
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 15
Source Project: openjdk-jdk9 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 16
Source Project: hottub 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 17
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 18
Source Project: jdk8u60 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(); }
Example 19
Source Project: hottub 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-jdk9 File: BadProvidersTest.java License: GNU General Public License v2.0 | 4 votes |
/** * Test a service provider that defines more than one no-args * public static "provider" method. */ @Test(expectedExceptions = ServiceConfigurationError.class) public void testWithTwoFactoryMethods() throws Exception { Path mods = compileTest(TEST1_MODULE); ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES); cw.visit(V1_9, ACC_PUBLIC + ACC_SUPER, "p/ProviderFactory", null, "java/lang/Object", null); // public static p.Service provider() MethodVisitor mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "provider", "()Lp/Service;", null, null); mv.visitTypeInsn(NEW, "p/ProviderFactory$1"); mv.visitInsn(DUP); mv.visitMethodInsn(INVOKESPECIAL, "p/ProviderFactory$1", "<init>", "()V", false); mv.visitInsn(ARETURN); mv.visitMaxs(0, 0); mv.visitEnd(); // public static p.ProviderFactory$1 provider() mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "provider", "()Lp/ProviderFactory$1;", null, null); mv.visitTypeInsn(NEW, "p/ProviderFactory$1"); mv.visitInsn(DUP); mv.visitMethodInsn(INVOKESPECIAL, "p/ProviderFactory$1", "<init>", "()V", false); mv.visitInsn(ARETURN); mv.visitMaxs(0, 0); mv.visitEnd(); cw.visitEnd(); // write the class bytes into the compiled module directory Path classFile = mods.resolve(TEST1_MODULE) .resolve("p") .resolve("ProviderFactory.class"); Files.write(classFile, cw.toByteArray()); // load providers and instantiate each one loadProviders(mods, TEST1_MODULE).forEach(Provider::get); }