Package org.objectweb.asm

Examples of org.objectweb.asm.ClassWriter

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public class BytecodeFactoryASM implements IBytecodeFactory {
 
  protected final BytecodeWriterTypeASM writer = new BytecodeWriterTypeASM();

  public BytecodeContextType createTypeContext(AbstractType type, BytecodeResolutionPool pool, Version version) {
    return new BytecodeContextTypeASM(null, pool, new ClassWriter(ClassWriter.COMPUTE_MAXS), type, writer, version);
  }
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        }
        return generated;
    }

    private <T> Class<? extends T> doGenerate(Class<T> type) {
        ClassWriter visitor = new ClassWriter(ClassWriter.COMPUTE_MAXS);
        String typeName = StringUtils.substringBeforeLast(type.getName(), ".") + ".LocationAware" + type.getSimpleName();
        Type generatedType = Type.getType("L" + typeName.replaceAll("\\.", "/") + ";");
        Type superclassType = Type.getType(type);

        visitor.visit(Opcodes.V1_5, Opcodes.ACC_PUBLIC, generatedType.getInternalName(), null,
                superclassType.getInternalName(), new String[]{Type.getType(LocationAwareException.class).getInternalName()});

        Type helperType = Type.getType(ExceptionHelper.class);
        Type throwableType = Type.getType(Throwable.class);
        Type scriptSourceType = Type.getType(ScriptSource.class);
        Type integerType = Type.getType(Integer.class);

        // GENERATE private ExceptionHelper helper;
        visitor.visitField(Opcodes.ACC_PRIVATE, "helper", helperType.getDescriptor(), null, null);

        // GENERATE <init>(<type> target, ScriptSource source, Integer lineNumber)

        String methodDescriptor = Type.getMethodDescriptor(Type.VOID_TYPE,
                new Type[]{superclassType, scriptSourceType, integerType});
        MethodVisitor methodVisitor = visitor.visitMethod(Opcodes.ACC_PUBLIC, "<init>", methodDescriptor, null,
                new String[0]);
        methodVisitor.visitCode();

        boolean noArgsConstructor;
        try {
            type.getConstructor(type);
            noArgsConstructor = false;
        } catch (NoSuchMethodException e) {
            try {
                type.getConstructor();
                noArgsConstructor = true;
            } catch (NoSuchMethodException e1) {
                throw new IllegalArgumentException(String.format(
                        "Cannot create subtype for exception '%s'. It needs a zero-args or copy constructor.",
                        type.getName()));
            }
        }

        if (noArgsConstructor) {
            // GENERATE super()
            methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
            methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, superclassType.getInternalName(), "<init>",
                    Type.getMethodDescriptor(Type.VOID_TYPE, new Type[0]));
            // END super()
        } else {
            // GENERATE super(target)
            methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
            methodVisitor.visitVarInsn(Opcodes.ALOAD, 1);
            methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, superclassType.getInternalName(), "<init>",
                    Type.getMethodDescriptor(Type.VOID_TYPE, new Type[]{superclassType}));
            // END super(target)
        }

        // GENERATE helper = new ExceptionHelper(this, target, source, lineNumber)
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);

        methodVisitor.visitTypeInsn(Opcodes.NEW, helperType.getInternalName());
        methodVisitor.visitInsn(Opcodes.DUP);
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 1);
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 2);
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 3);
        methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, helperType.getInternalName(), "<init>",
                Type.getMethodDescriptor(Type.VOID_TYPE, new Type[]{throwableType, throwableType, scriptSourceType, integerType}));

        methodVisitor.visitFieldInsn(Opcodes.PUTFIELD, generatedType.getInternalName(), "helper",
                helperType.getDescriptor());

        // END helper = new ExceptionHelper(target)

        methodVisitor.visitInsn(Opcodes.RETURN);
        methodVisitor.visitMaxs(0, 0);
        methodVisitor.visitEnd();

        // END <init>(<type> target, ScriptSource source, Integer lineNumber)

        for (Method method : ExceptionHelper.class.getDeclaredMethods()) {
            // GENERATE public <type> <method>() { return helper.<method>(); }
            methodDescriptor = Type.getMethodDescriptor(Type.getType(method.getReturnType()), new Type[0]);
            methodVisitor = visitor.visitMethod(Opcodes.ACC_PUBLIC, method.getName(), methodDescriptor, null,
                    new String[0]);
            methodVisitor.visitCode();

            methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
            methodVisitor.visitFieldInsn(Opcodes.GETFIELD, generatedType.getInternalName(), "helper",
                    helperType.getDescriptor());
            methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, helperType.getInternalName(), method.getName(),
                    methodDescriptor);

            methodVisitor.visitInsn(Opcodes.ARETURN);
            methodVisitor.visitMaxs(0, 0);
            methodVisitor.visitEnd();
            // END public <type> <method>() { return helper.<method>(); }
        }

        visitor.visitEnd();

        byte[] bytecode = visitor.toByteArray();
        return (Class<T>) ReflectionUtil.invoke(type.getClassLoader(), "defineClass", new Object[]{
                typeName, bytecode, 0, bytecode.length
        });
    }
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        }
        return subclass.asSubclass(type);
    }

    private <T extends Script> Class<? extends T> generateEmptyScriptClass(Class<T> type) {
        ClassWriter visitor = new ClassWriter(ClassWriter.COMPUTE_MAXS);
        String typeName = type.getName() + "_Decorated";
        Type generatedType = Type.getType("L" + typeName.replaceAll("\\.", "/") + ";");
        Type superclassType = Type.getType(type);
        visitor.visit(Opcodes.V1_5, Opcodes.ACC_PUBLIC, generatedType.getInternalName(), null,
                superclassType.getInternalName(), new String[0]);

        // Constructor

        String constructorDescriptor = Type.getMethodDescriptor(Type.VOID_TYPE, new Type[0]);
        MethodVisitor methodVisitor = visitor.visitMethod(Opcodes.ACC_PUBLIC, "<init>", constructorDescriptor, null,
                new String[0]);
        methodVisitor.visitCode();

        // super()
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
        methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, superclassType.getInternalName(), "<init>",
                constructorDescriptor);

        methodVisitor.visitInsn(Opcodes.RETURN);
        methodVisitor.visitMaxs(0, 0);
        methodVisitor.visitEnd();

        // run() method

        String runDesciptor = Type.getMethodDescriptor(Type.getType(Object.class), new Type[0]);
        methodVisitor = visitor.visitMethod(Opcodes.ACC_PUBLIC, "run", runDesciptor, null, new String[0]);
        methodVisitor.visitCode();

        // return null
        methodVisitor.visitInsn(Opcodes.ACONST_NULL);

        methodVisitor.visitInsn(Opcodes.ARETURN);
        methodVisitor.visitMaxs(0, 0);
        methodVisitor.visitEnd();

        visitor.visitEnd();

        byte[] bytecode = visitor.toByteArray();
        return (Class<T>) ReflectionUtil.invoke(type.getClassLoader(), "defineClass", new Object[]{
                typeName, bytecode, 0, bytecode.length
        });
    }
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        }
        return new ReflectiveMethodHandle(method);
    }

    private static Constructor compileMethodHandle(Method cachedMethod, ClassLoaderForClassArtifacts loader) {
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
        final String name = loader.createClassName(cachedMethod);
        final byte[] bytes = genMethodHandle(cachedMethod, cw, name);
        return loader.defineClassAndGetConstructor(name, bytes);
    }
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        return cw.toByteArray();
    }

    public static Constructor compilePogoMethod(CachedMethod cachedMethod) {
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);

        final CachedClass declClass = cachedMethod.getDeclaringClass();
        final CallSiteClassLoader callSiteLoader = declClass.getCallSiteLoader();
        final String name = callSiteLoader.createClassName(cachedMethod.setAccessible());
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        return callSiteLoader.defineClassAndGetConstructor(name, bytes);
    }

    public static Constructor compilePojoMethod(CachedMethod cachedMethod) {
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);

        final CachedClass declClass = cachedMethod.getDeclaringClass();
        final CallSiteClassLoader callSiteLoader = declClass.getCallSiteLoader();
        final String name = callSiteLoader.createClassName(cachedMethod.setAccessible());
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        return callSiteLoader.defineClassAndGetConstructor(name, bytes);
    }

    public static Constructor compileStaticMethod(CachedMethod cachedMethod) {
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);

        final CachedClass declClass = cachedMethod.getDeclaringClass();
        final CallSiteClassLoader callSiteLoader = declClass.getCallSiteLoader();
        final String name = callSiteLoader.createClassName(cachedMethod.setAccessible());
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* @author Eric Bruneton
*/
public class AddTimerAdapterTest extends AbstractTestCase {

  public void test() throws Exception {
    ClassWriter cw = new ClassWriter(0);
    CheckClassAdapter ca = new CheckClassAdapter(cw);
    ClassVisitor cv = getClassAdapter(ca);
    generateBasicClass(cv);
    checkClass(defineClass("C", cw.toByteArray()));
  }
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  private Method m;

  private Object[] args;

  public void test() throws Throwable {
    ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
    CheckClassAdapter ca = new CheckClassAdapter(cw);
    ProxyGenerator pg = new ProxyGenerator(Comparable.class);
    pg.generate(Type.getType("LC;"), ca);

    InvocationHandler handler = new InvocationHandler() {
      public Object invoke(Object proxy, Method method, Object[] args)
          throws Throwable {
        ProxyGeneratorTest.this.p = proxy;
        ProxyGeneratorTest.this.m = method;
        ProxyGeneratorTest.this.args = args;
        return 1;
      }
    };

    Class c = defineClass("C", cw.toByteArray());
    Constructor ct = c.getConstructor(InvocationHandler.class);
    Comparable o = (Comparable) ct.newInstance(handler);
    int result = o.compareTo(new Integer(123));

    assertEquals(o, p);
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    fields.put("f4", Type.DOUBLE_TYPE);
    fields.put("f5", Type.getType("Ljava/lang/String;"));
    fields.put("f6", Type.getType("[I"));
    BeanGenerator3 bg = new BeanGenerator3("MyBean", fields);

    ClassWriter cw = new ClassWriter(0);
    CheckClassAdapter ca = new CheckClassAdapter(cw);
    bg.generate(ca);

    Class c = defineClass("MyBean", cw.toByteArray());
    checkClass(c);
  }
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