Package org.objectweb.asm

Examples of org.objectweb.asm.ClassVisitor

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   *
   * @param reader
   *            reader with class definitions
   */
  public void analyzeClass(final ClassReader reader) {
    final ClassVisitor visitor = createAnalyzingVisitor(CRC64
        .checksum(reader.b));
    reader.accept(visitor, 0);
  }
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    Variable buildVariableAccessor(jnr.ffi.Runtime runtime, long address, Class interfaceClass, Class javaType, Collection<Annotation> annotations,
                                   ToNativeConverter toNativeConverter, FromNativeConverter fromNativeConverter,
                                   AsmClassLoader classLoader) {
        boolean debug = AsmLibraryLoader.DEBUG && !hasAnnotation(annotations, NoTrace.class);
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
        ClassVisitor cv = debug ? AsmUtil.newCheckClassAdapter(cw) : cw;

        AsmBuilder builder = new AsmBuilder(runtime, p(interfaceClass) + "$VariableAccessor$$" + nextClassID.getAndIncrement(), cv, classLoader);
        cv.visit(V1_6, ACC_PUBLIC | ACC_FINAL, builder.getClassNamePath(), null, p(Object.class),
                new String[] { p(Variable.class) });

        SkinnyMethodAdapter set = new SkinnyMethodAdapter(builder.getClassVisitor(), ACC_PUBLIC | ACC_FINAL, "set",
                sig(void.class, Object.class),
                null, null);

        Class boxedType = toNativeConverter != null ? toNativeConverter.nativeType() : javaType;
        NativeType nativeType = Types.getType(runtime, boxedType, annotations).getNativeType();
        ToNativeType toNativeType = new ToNativeType(javaType, nativeType, annotations, toNativeConverter, null);
        FromNativeType fromNativeType = new FromNativeType(javaType, nativeType, annotations, fromNativeConverter, null);
        PointerOp pointerOp = pointerOperations.get(nativeType);
        if (pointerOp == null) {
            throw new IllegalArgumentException("global variable type not supported: " + javaType);
        }

        set.start();
        set.aload(0);
        Pointer pointer = DirectMemoryIO.wrap(runtime, address);
        set.getfield(builder.getClassNamePath(), builder.getObjectFieldName(pointer, Pointer.class), ci(Pointer.class));
        set.lconst_0();

        set.aload(1);
        set.checkcast(javaType);
        emitToNativeConversion(builder, set, toNativeType);

        ToNativeOp toNativeOp = ToNativeOp.get(toNativeType);
        if (toNativeOp != null && toNativeOp.isPrimitive()) {
            toNativeOp.emitPrimitive(set, pointerOp.nativeIntClass, toNativeType.nativeType);
        } else {
            throw new IllegalArgumentException("global variable type not supported: " + javaType);
        }

        pointerOp.put(set);

        set.voidreturn();
        set.visitMaxs(10, 10);
        set.visitEnd();

        SkinnyMethodAdapter get = new SkinnyMethodAdapter(builder.getClassVisitor(), ACC_PUBLIC | ACC_FINAL, "get",
                sig(Object.class),
                null, null);

        get.start();
        get.aload(0);
        get.getfield(builder.getClassNamePath(), builder.getObjectFieldName(pointer, Pointer.class), ci(Pointer.class));
        get.lconst_0();
        pointerOp.get(get);
        emitFromNativeConversion(builder, get, fromNativeType, pointerOp.nativeIntClass);
        get.areturn();
        get.visitMaxs(10, 10);
        get.visitEnd();

        SkinnyMethodAdapter init = new SkinnyMethodAdapter(cv, ACC_PUBLIC, "<init>",
                sig(void.class, Object[].class),
                null, null);
        init.start();
        init.aload(0);
        init.invokespecial(p(Object.class), "<init>", sig(void.class));

        builder.emitFieldInitialization(init, 1);

        init.voidreturn();
        init.visitMaxs(10, 10);
        init.visitEnd();

        cv.visitEnd();

        try {
            byte[] bytes = cw.toByteArray();
            if (debug) {
                ClassVisitor trace = AsmUtil.newTraceClassVisitor(new PrintWriter(System.err));
                new ClassReader(bytes).accept(trace, 0);
            }

            Class<Variable> implClass = classLoader.defineClass(builder.getClassNamePath().replace("/", "."), bytes);
            Constructor<Variable> cons = implClass.getDeclaredConstructor(Object[].class);
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    private <T> T generateInterfaceImpl(final NativeLibrary library, Class<T> interfaceClass, Map<LibraryOption, ?> libraryOptions,
                                        AsmClassLoader classLoader) {

        boolean debug = DEBUG && !interfaceClass.isAnnotationPresent(NoTrace.class);
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
        ClassVisitor cv = debug ? AsmUtil.newCheckClassAdapter(cw) : cw;

        AsmBuilder builder = new AsmBuilder(runtime, p(interfaceClass) + "$jnr$ffi$" + nextClassID.getAndIncrement(), cv, classLoader);

        cv.visit(V1_6, ACC_PUBLIC | ACC_FINAL, builder.getClassNamePath(), null, p(AbstractAsmLibraryInterface.class),
                new String[] { p(interfaceClass) });

        FunctionMapper functionMapper = libraryOptions.containsKey(LibraryOption.FunctionMapper)
                ? (FunctionMapper) libraryOptions.get(LibraryOption.FunctionMapper) : IdentityFunctionMapper.getInstance();

        SignatureTypeMapper typeMapper;
        if (libraryOptions.containsKey(LibraryOption.TypeMapper)) {
            Object tm = libraryOptions.get(LibraryOption.TypeMapper);
            if (tm instanceof SignatureTypeMapper) {
                typeMapper = (SignatureTypeMapper) tm;
            } else if (tm instanceof TypeMapper) {
                typeMapper = new SignatureTypeMapperAdapter((TypeMapper) tm);
            } else {
                throw new IllegalArgumentException("TypeMapper option is not a valid TypeMapper instance");
            }
        } else {
            typeMapper = new NullTypeMapper();
        }

        typeMapper = new CompositeTypeMapper(typeMapper, new CachingTypeMapper(new InvokerTypeMapper(new NativeClosureManager(runtime, typeMapper, classLoader), classLoader)));
        com.kenai.jffi.CallingConvention libraryCallingConvention = getCallingConvention(interfaceClass, libraryOptions);

        StubCompiler compiler = StubCompiler.newCompiler(runtime);

        final MethodGenerator[] generators = {
                !interfaceClass.isAnnotationPresent(NoX86.class)
                    ? new X86MethodGenerator(compiler) : new NotImplMethodGenerator(),
                new FastIntMethodGenerator(),
                new FastLongMethodGenerator(),
                new FastNumericMethodGenerator(),
                new BufferMethodGenerator()
        };


        for (Method m : interfaceClass.getMethods()) {
            if (Variable.class.isAssignableFrom(m.getReturnType())) {
                continue;
            }
            Collection<Annotation> annotations = sortedAnnotationCollection(m.getAnnotations());
            String functionName = functionMapper.mapFunctionName(m.getName(), new NativeFunctionMapperContext(library, annotations));

            // Allow individual methods to set the calling convention to stdcall
            CallingConvention callingConvention = m.isAnnotationPresent(StdCall.class)
                    ? CallingConvention.STDCALL : libraryCallingConvention;
            boolean saveErrno = InvokerUtil.requiresErrno(m);
            try {
                generateFunctionInvocation(runtime, builder, m, library.findSymbolAddress(functionName),
                        callingConvention, saveErrno, typeMapper, generators);

            } catch (SymbolNotFoundError ex) {
                String errorFieldName = "error_" + uniqueId.incrementAndGet();
                cv.visitField(ACC_PRIVATE | ACC_FINAL | ACC_STATIC, errorFieldName, ci(String.class), null, ex.getMessage());
                generateFunctionNotFound(cv, builder.getClassNamePath(), errorFieldName, functionName, m.getReturnType(), m.getParameterTypes());
            }
        }

        // generate global variable accessors
        VariableAccessorGenerator variableAccessorGenerator = new VariableAccessorGenerator(runtime);
        for (Method m : interfaceClass.getMethods()) {
            if (Variable.class == m.getReturnType()) {
                java.lang.reflect.Type variableType = ((ParameterizedType) m.getGenericReturnType()).getActualTypeArguments()[0];
                if (!(variableType instanceof Class)) {
                    throw new IllegalArgumentException("unsupported variable class: " + variableType);
                }
                String functionName = functionMapper.mapFunctionName(m.getName(), null);
                try {
                    variableAccessorGenerator.generate(builder, interfaceClass, m.getName(),
                            library.findSymbolAddress(functionName), (Class) variableType, sortedAnnotationCollection(m.getAnnotations()),
                            typeMapper, classLoader);

                } catch (SymbolNotFoundError ex) {
                    String errorFieldName = "error_" + uniqueId.incrementAndGet();
                    cv.visitField(ACC_PRIVATE | ACC_FINAL | ACC_STATIC, errorFieldName, ci(String.class), null, ex.getMessage());
                    generateFunctionNotFound(cv, builder.getClassNamePath(), errorFieldName, functionName, m.getReturnType(), m.getParameterTypes());
                }
            }
        }


        // Create the constructor to set the instance fields
        SkinnyMethodAdapter init = new SkinnyMethodAdapter(cv, ACC_PUBLIC, "<init>",
                sig(void.class, jnr.ffi.Runtime.class, NativeLibrary.class, Object[].class),
                null, null);
        init.start();
        // Invoke the super class constructor as super(Library)
        init.aload(0);
        init.aload(1);
        init.aload(2);
        init.invokespecial(p(AbstractAsmLibraryInterface.class), "<init>", sig(void.class, jnr.ffi.Runtime.class, NativeLibrary.class));

        builder.emitFieldInitialization(init, 3);

        init.voidreturn();
        init.visitMaxs(10, 10);
        init.visitEnd();

        cv.visitEnd();

        try {
            byte[] bytes = cw.toByteArray();
            if (debug) {
                ClassVisitor trace = AsmUtil.newTraceClassVisitor(new PrintWriter(System.err));
                new ClassReader(bytes).accept(trace, 0);
            }

            Class<T> implClass = classLoader.defineClass(builder.getClassNamePath().replace("/", "."), bytes);
            Constructor<T> cons = implClass.getDeclaredConstructor(jnr.ffi.Runtime.class, NativeLibrary.class, Object[].class);
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                    + jnr.ffi.Runtime.class.getName(), ex);
        }


        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
        ClassVisitor cv = AsmLibraryLoader.DEBUG ? AsmUtil.newCheckClassAdapter(cw) : cw;

        final String className = p(structClass) + "$jnr$fromNativeConverter$" + nextClassID.getAndIncrement();

        cv.visit(V1_5, ACC_PUBLIC | ACC_FINAL, className, null, p(AsmStructByReferenceFromNativeConverter.class),
                new String[0]);

        cv.visitAnnotation(ci(FromNativeConverter.NoContext.class), true);

        // Create the constructor to set the instance fields
        SkinnyMethodAdapter init = new SkinnyMethodAdapter(cv, ACC_PUBLIC, "<init>", sig(void.class, jnr.ffi.Runtime.class, int.class), null, null);
        init.start();
        // Invoke the super class constructor as super(Library)
        init.aload(0);
        init.aload(1);
        init.iload(2);
        init.invokespecial(p(AsmStructByReferenceFromNativeConverter.class), "<init>", sig(void.class, jnr.ffi.Runtime.class, int.class));
        init.voidreturn();
        init.visitMaxs(10, 10);
        init.visitEnd();

        SkinnyMethodAdapter fromNative = new SkinnyMethodAdapter(cv, ACC_PUBLIC | ACC_FINAL, "fromNative",
                sig(structClass, Pointer.class, FromNativeContext.class), null, null);

        fromNative.start();
        Label nullPointer = new Label();
        fromNative.aload(1);
        fromNative.ifnull(nullPointer);

        // Create an instance of the struct subclass
        fromNative.newobj(p(structClass));
        fromNative.dup();
        fromNative.aload(0);
        fromNative.invokevirtual(p(AsmStructByReferenceFromNativeConverter.class), "getRuntime", sig(Runtime.class));
        fromNative.invokespecial(structClass, "<init>", void.class, jnr.ffi.Runtime.class);

        // associate the memory with the struct and return the struct
        fromNative.dup();
        fromNative.aload(1);
        fromNative.invokevirtual(structClass, "useMemory", void.class, Pointer.class);
        fromNative.areturn();

        fromNative.label(nullPointer);
        fromNative.aconst_null();
        fromNative.areturn();

        fromNative.visitAnnotation(ci(FromNativeConverter.NoContext.class), true);
        fromNative.visitMaxs(10, 10);
        fromNative.visitEnd();

        fromNative = new SkinnyMethodAdapter(cv, ACC_PUBLIC | ACC_FINAL, "fromNative",
                sig(Object.class, Object.class, FromNativeContext.class), null, null);
        fromNative.start();
        fromNative.aload(0);
        fromNative.aload(1);
        fromNative.checkcast(Pointer.class);
        fromNative.aload(2);
        fromNative.invokevirtual(className, "fromNative", sig(structClass, Pointer.class, FromNativeContext.class));
        fromNative.areturn();
        fromNative.visitAnnotation(ci(FromNativeConverter.NoContext.class), true);
        fromNative.visitMaxs(10, 10);
        fromNative.visitEnd();
        cv.visitEnd();

        try {
            byte[] bytes = cw.toByteArray();
            if (AsmLibraryLoader.DEBUG) {
                ClassVisitor trace = AsmUtil.newTraceClassVisitor(new PrintWriter(System.err));
                new ClassReader(bytes).accept(trace, 0);
            }

            return classLoader.defineClass(className.replace("/", "."), bytes);
        } catch (Throwable ex) {
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    static Factory newProxyFactory(jnr.ffi.Runtime runtime, Method callMethod,
                            ToNativeType resultType, FromNativeType[] parameterTypes, AsmClassLoader classLoader) {
        final String closureProxyClassName = p(NativeClosureProxy.class) + "$$impl$$" + nextClassID.getAndIncrement();
        final ClassWriter closureClassWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
        final ClassVisitor closureClassVisitor = DEBUG ? AsmUtil.newCheckClassAdapter(closureClassWriter) : closureClassWriter;
        AsmBuilder builder = new AsmBuilder(runtime, closureProxyClassName, closureClassVisitor, classLoader);

        closureClassVisitor.visit(V1_6, ACC_PUBLIC | ACC_FINAL, closureProxyClassName, null, p(NativeClosureProxy.class),
                new String[]{ });

        Class[] nativeParameterClasses = new Class[parameterTypes.length];
        for (int i = 0; i < parameterTypes.length; i++) {
            nativeParameterClasses[i] = getNativeClass(parameterTypes[i].nativeType);
        }

        Class nativeResultClass = getNativeClass(resultType.nativeType);

        SkinnyMethodAdapter mv = new SkinnyMethodAdapter(closureClassVisitor, ACC_PUBLIC | ACC_FINAL, "invoke",
                sig(nativeResultClass, nativeParameterClasses),
                null, null);
        mv.start();

        // Cast the callable instance to the correct class
        mv.aload(0);
        mv.invokevirtual(NativeClosureProxy.class, "getCallable", Object.class);
        mv.checkcast(p(callMethod.getDeclaringClass()));

        LocalVariable[] parameterVariables = AsmUtil.getParameterVariables(nativeParameterClasses);

        // Construct callback method
        LocalVariableAllocator localVariableAllocator = new LocalVariableAllocator(nativeParameterClasses);

        for (int i = 0; i < parameterTypes.length; ++i) {
            FromNativeType parameterType = parameterTypes[i];
            Class parameterClass = parameterType.effectiveJavaType();

            if (!isParameterTypeSupported(parameterClass)) {
                throw new IllegalArgumentException("unsupported closure parameter type " + parameterTypes[i].getDeclaredType());
            }

            AsmUtil.load(mv, nativeParameterClasses[i], parameterVariables[i]);
            if (!parameterClass.isPrimitive()) {
                emitFromNativeConversion(builder, mv, parameterTypes[i], nativeParameterClasses[i]);
            } else {
                convertPrimitive(mv, nativeParameterClasses[i], parameterClass, parameterType.nativeType);
            }
        }

        // dispatch to java method
        if (callMethod.getDeclaringClass().isInterface()) {
            mv.invokeinterface(p(callMethod.getDeclaringClass()), callMethod.getName(), sig(callMethod.getReturnType(), callMethod.getParameterTypes()));
        } else {
            mv.invokevirtual(p(callMethod.getDeclaringClass()), callMethod.getName(), sig(callMethod.getReturnType(), callMethod.getParameterTypes()));
        }

        if (!isReturnTypeSupported(resultType.effectiveJavaType())) {
            throw new IllegalArgumentException("unsupported closure return type " + resultType.getDeclaredType());
        }

        emitToNativeConversion(builder, mv, resultType);
        if (!resultType.effectiveJavaType().isPrimitive()) {
            if (Number.class.isAssignableFrom(resultType.effectiveJavaType())) {
                AsmUtil.unboxNumber(mv, resultType.effectiveJavaType(), nativeResultClass, resultType.nativeType);

            } else if (Boolean.class.isAssignableFrom(resultType.effectiveJavaType())) {
                AsmUtil.unboxBoolean(mv, nativeResultClass);

            } else if (Pointer.class.isAssignableFrom(resultType.effectiveJavaType())) {
                AsmUtil.unboxPointer(mv, nativeResultClass);

            }
        }

        emitReturnOp(mv, nativeResultClass);
        mv.visitMaxs(10, 10 + localVariableAllocator.getSpaceUsed());
        mv.visitEnd();

        SkinnyMethodAdapter closureInit = new SkinnyMethodAdapter(closureClassVisitor, ACC_PUBLIC, "<init>",
                sig(void.class, NativeRuntime.class, Object[].class),
                null, null);
        closureInit.start();
        closureInit.aload(0);
        closureInit.aload(1);
        closureInit.invokespecial(p(NativeClosureProxy.class), "<init>", sig(void.class, NativeRuntime.class));

        AsmBuilder.ObjectField[] fields = builder.getObjectFieldArray();
        Object[] fieldObjects = new Object[fields.length];
        for (int i = 0; i < fieldObjects.length; i++) {
            fieldObjects[i] = fields[i].value;
            String fieldName = fields[i].name;
            builder.getClassVisitor().visitField(ACC_PRIVATE | ACC_FINAL, fieldName, ci(fields[i].klass), null, null);
            closureInit.aload(0);
            closureInit.aload(2);
            closureInit.pushInt(i);
            closureInit.aaload();
            if (fields[i].klass.isPrimitive()) {
                Class unboxedType = unboxedType(fields[i].klass);
                closureInit.checkcast(unboxedType);
                unboxNumber(closureInit, unboxedType, fields[i].klass);
            } else {
                closureInit.checkcast(fields[i].klass);
            }
            closureInit.putfield(builder.getClassNamePath(), fieldName, ci(fields[i].klass));
        }

        closureInit.voidreturn();
        closureInit.visitMaxs(10, 10);
        closureInit.visitEnd();

        closureClassVisitor.visitEnd();

        try {
            byte[] closureImpBytes = closureClassWriter.toByteArray();
            if (DEBUG) {
                ClassVisitor trace = AsmUtil.newTraceClassVisitor(new PrintWriter(System.err));
                new ClassReader(closureImpBytes).accept(trace, 0);
            }
            ClassLoader cl = NativeClosureFactory.class.getClassLoader();
            if (cl == null) {
                cl = Thread.currentThread().getContextClassLoader();
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    private static final AtomicLong nextClassID = new AtomicLong(0);
    private static FromNativeConverter newClosureConverter(jnr.ffi.Runtime runtime, AsmClassLoader classLoader, Class closureClass,
                                                                        SignatureTypeMapper typeMapper) {

        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
        ClassVisitor cv = AsmLibraryLoader.DEBUG ? AsmUtil.newCheckClassAdapter(cw) : cw;

        final String className = p(closureClass) + "$jnr$fromNativeConverter$" + nextClassID.getAndIncrement();
        AsmBuilder builder = new AsmBuilder(runtime, className, cv, classLoader);

        cv.visit(V1_6, ACC_PUBLIC | ACC_FINAL, className, null, p(AbstractClosurePointer.class),
                new String[] { p(closureClass) } );

        cv.visitAnnotation(ci(FromNativeConverter.NoContext.class), true);

        generateInvocation(runtime, builder, closureClass, typeMapper);

        // Create the constructor to set the instance fields
        SkinnyMethodAdapter init = new SkinnyMethodAdapter(cv, ACC_PUBLIC, "<init>",
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    private static Class loadClass(AsmClassLoader classLoader, String className, ClassWriter cw) {
        try {
            byte[] bytes = cw.toByteArray();
            if (AsmLibraryLoader.DEBUG) {
                ClassVisitor trace = AsmUtil.newTraceClassVisitor(new PrintWriter(System.err));
                new ClassReader(bytes).accept(trace, 0);
            }

            return classLoader.defineClass(className.replace("/", "."), bytes);
        } catch (Throwable ex) {
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   */
  private CollectClassData processClass(CompiledClass compiledClass) {
    byte[] classBytes = compiledClass.getBytes();
    ClassReader reader = new ClassReader(classBytes);
    CollectClassData mcv = new CollectClassData();
    ClassVisitor cv = mcv;
    if (TRACE_CLASSES) {
      cv = new TraceClassVisitor(cv, new PrintWriter(System.out));
    }
    reader.accept(cv, 0);
    return mcv;
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    String desc = toDescriptor(className);
    assert (!jsoIntfDescs.contains(desc));

    // The ASM model is to chain a bunch of visitors together.
    ClassWriter writer = new ClassWriter(0);
    ClassVisitor v = writer;

    // v = new CheckClassAdapter(v);
    // v = new TraceClassVisitor(v, new PrintWriter(System.out));

    v = new RewriteSingleJsoImplDispatches(v, typeOracle, jsoData);
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    assert (superDescs != null);
    assert (superDescs.size() > 0);

    // The ASM model is to chain a bunch of visitors together.
    ClassWriter writer = new ClassWriter(0);
    ClassVisitor v = writer;

    // v = new CheckClassAdapter(v);
    // v = new TraceClassVisitor(v, new PrintWriter(System.out));

    String[] interfaces;
    // TODO(bov): something better than linear?
    if (superDescs.contains("java/lang/Object")) {
      interfaces = null;
    } else {
      interfaces = superDescs.toArray(new String[superDescs.size()]);
    }
    v.visit(Opcodes.V1_5, Opcodes.ACC_PUBLIC | Opcodes.ACC_INTERFACE, desc,
        null, "java/lang/Object", interfaces);
    v.visitEnd();
    return writer.toByteArray();
  }
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