Examples with FieldVisitor org.objectweb.asm.FieldVisitor used on opensource projects

Example 31 with FieldVisitor

use of org.objectweb.asm.FieldVisitor in project atlas by alibaba.

the class AsmTest method test.

@Test
public void test() throws Throwable {
    ClassReader cr = new ClassReader(Config.class.getName());
    ClassWriter cw = new ClassWriter(cr, ClassWriter.COMPUTE_MAXS);
    ClassVisitor cv = new MethodChangeClassAdapter(cw);
    cr.accept(cv, Opcodes.ASM5);
    // Add a new method
    MethodVisitor mw = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "add", "([Ljava/lang/String;)V", null, null);
    // pushes the 'out' field (of type PrintStream) of the System class
    mw.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
    // pushes the "Hello World!" String constant
    mw.visitLdcInsn("this is add method print!");
    // invokes the 'println' method (defined in the PrintStream class)
    mw.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V");
    mw.visitInsn(RETURN);
    // this code uses a maximum of two stack elements and two local
    // variables
    mw.visitMaxs(0, 0);
    mw.visitEnd();
    // Type.getDescriptor(AdviceFlowOuterHolder.class)
    FieldVisitor fv = cw.visitField(ACC_PUBLIC + ACC_STATIC + ACC_FINAL, "age", Type.INT_TYPE.toString(), null, 1);
    fv.visitEnd();
    FieldVisitor fv2 = cw.visitField(ACC_PUBLIC + ACC_STATIC + ACC_FINAL, "name2", Type.getDescriptor(String.class), null, "name2");
    fv2.visitEnd();
    ModifyClassVisiter cv2 = new ModifyClassVisiter(Opcodes.ASM5);
    cv2.addRemoveField("name");
    cr.accept(cv2, Opcodes.ASM5);
    FieldVisitor fv3 = cw.visitField(ACC_PUBLIC + ACC_STATIC + ACC_FINAL, "name", Type.getDescriptor(String.class), null, "name");
    fv3.visitEnd();
    byte[] code = cw.toByteArray();
    File file = new File("Config.class");
    System.out.println(file.getAbsolutePath());
    FileOutputStream fos = new FileOutputStream(file);
    fos.write(code);
    fos.close();
}

Example 32 with FieldVisitor

use of org.objectweb.asm.FieldVisitor in project groovy by apache.

the class AsmClassGenerator method visitField.

@Override
public void visitField(final FieldNode fieldNode) {
    onLineNumber(fieldNode, "visitField: " + fieldNode.getName());
    ClassNode t = fieldNode.getType();
    String signature = BytecodeHelper.getGenericsBounds(t);
    Expression initialValueExpression = fieldNode.getInitialValueExpression();
    ConstantExpression cexp = initialValueExpression instanceof ConstantExpression ? (ConstantExpression) initialValueExpression : null;
    if (cexp != null) {
        cexp = Verifier.transformToPrimitiveConstantIfPossible(cexp);
    }
    Object value = cexp != null && ClassHelper.isStaticConstantInitializerType(cexp.getType()) && cexp.getType().equals(t) && fieldNode.isStatic() && fieldNode.isFinal() ? cexp.getValue() : // GROOVY-5150
    null;
    if (value != null) {
        // byte, char and short require an extra cast
        if (isPrimitiveByte(t) || isPrimitiveShort(t)) {
            value = ((Number) value).intValue();
        } else if (isPrimitiveChar(t)) {
            value = Integer.valueOf((Character) value);
        }
    }
    FieldVisitor fv = classVisitor.visitField(fieldNode.getModifiers(), fieldNode.getName(), BytecodeHelper.getTypeDescription(t), signature, value);
    visitAnnotations(fieldNode, fv);
    visitType(fieldNode.getType(), fv, newTypeReference(FIELD), "", true);
    fv.visitEnd();
}

Example 33 with FieldVisitor

use of org.objectweb.asm.FieldVisitor in project aries by apache.

the class AbstractWovenProxyAdapter method generateField.

/**
 * Generate an instance field that should be "invisible" to normal code
 *
 * @param fieldName
 * @param fieldDescriptor
 */
private final void generateField(String fieldName, String fieldDescriptor) {
    FieldVisitor fv = cv.visitField(ACC_PROTECTED | ACC_TRANSIENT | ACC_SYNTHETIC | ACC_FINAL, fieldName, fieldDescriptor, null, null);
    for (String s : annotationTypeDescriptors) fv.visitAnnotation(s, true).visitEnd();
    fv.visitEnd();
}

Example 34 with FieldVisitor

use of org.objectweb.asm.FieldVisitor in project spring-loaded by spring-projects.

the class SystemClassReflectionGenerator method generateJLCMethod.

public static void generateJLCMethod(ClassWriter cw, String classname, String membername, String methodname) {
    FieldVisitor fv = cw.visitField(ACC_PUBLIC + ACC_STATIC, membername, "Ljava/lang/reflect/Method;", null, null);
    fv.visitEnd();
    MethodVisitor mv = cw.visitMethod(ACC_PRIVATE + ACC_STATIC + ACC_VARARGS, membername, "(Ljava/lang/Class;Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;", null, new String[] { "java/lang/NoSuchMethodException" });
    mv.visitCode();
    Label l0 = new Label();
    Label l1 = new Label();
    Label l2 = new Label();
    mv.visitTryCatchBlock(l0, l1, l2, "java/lang/reflect/InvocationTargetException");
    Label l3 = new Label();
    mv.visitTryCatchBlock(l0, l1, l3, "java/lang/Exception");
    Label l4 = new Label();
    mv.visitLabel(l4);
    mv.visitFieldInsn(GETSTATIC, classname, membername, "Ljava/lang/reflect/Method;");
    mv.visitJumpInsn(IFNONNULL, l0);
    Label l5 = new Label();
    mv.visitLabel(l5);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitVarInsn(ALOAD, 2);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Class", methodname, "(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;", false);
    mv.visitInsn(ARETURN);
    mv.visitLabel(l0);
    mv.visitFieldInsn(GETSTATIC, classname, membername, "Ljava/lang/reflect/Method;");
    mv.visitInsn(ACONST_NULL);
    mv.visitInsn(ICONST_3);
    mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
    mv.visitInsn(DUP);
    mv.visitInsn(ICONST_0);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitInsn(AASTORE);
    mv.visitInsn(DUP);
    mv.visitInsn(ICONST_1);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitInsn(AASTORE);
    mv.visitInsn(DUP);
    mv.visitInsn(ICONST_2);
    mv.visitVarInsn(ALOAD, 2);
    mv.visitInsn(AASTORE);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Method", "invoke", "(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;", false);
    mv.visitTypeInsn(CHECKCAST, "java/lang/reflect/Method");
    mv.visitLabel(l1);
    mv.visitInsn(ARETURN);
    mv.visitLabel(l2);
    mv.visitVarInsn(ASTORE, 3);
    Label l6 = new Label();
    mv.visitLabel(l6);
    // Don't print the exception if just unwrapping it
    // mv.visitVarInsn(ALOAD, 3);
    // mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/InvocationTargetException", "printStackTrace", "()V");
    Label l7 = new Label();
    mv.visitLabel(l7);
    mv.visitVarInsn(ALOAD, 3);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/InvocationTargetException", "getCause", "()Ljava/lang/Throwable;", false);
    mv.visitTypeInsn(INSTANCEOF, "java/lang/NoSuchMethodException");
    Label l8 = new Label();
    mv.visitJumpInsn(IFEQ, l8);
    Label l9 = new Label();
    mv.visitLabel(l9);
    mv.visitVarInsn(ALOAD, 3);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/InvocationTargetException", "getCause", "()Ljava/lang/Throwable;", false);
    mv.visitTypeInsn(CHECKCAST, "java/lang/NoSuchMethodException");
    mv.visitInsn(ATHROW);
    mv.visitLabel(l3);
    mv.visitVarInsn(ASTORE, 3);
    Label l10 = new Label();
    mv.visitLabel(l10);
    mv.visitVarInsn(ALOAD, 3);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Exception", "printStackTrace", "()V", false);
    mv.visitLabel(l8);
    mv.visitInsn(ACONST_NULL);
    mv.visitInsn(ARETURN);
    Label l11 = new Label();
    mv.visitLabel(l11);
    // mv.visitLocalVariable("clazz", "Ljava/lang/Class;", "Ljava/lang/Class<*>;", l4, l11, 0);
    // mv.visitLocalVariable("methodname", "Ljava/lang/String;", null, l4, l11, 1);
    // mv.visitLocalVariable("parameterTypes", "[Ljava/lang/Class;", null, l4, l11, 2);
    // mv.visitLocalVariable("ite", "Ljava/lang/reflect/InvocationTargetException;", null, l6, l3, 3);
    // mv.visitLocalVariable("e", "Ljava/lang/Exception;", null, l10, l8, 3);
    mv.visitMaxs(6, 4);
    mv.visitEnd();
}

Example 35 with FieldVisitor

use of org.objectweb.asm.FieldVisitor in project spring-loaded by spring-projects.

the class SystemClassReflectionGenerator method generateJLRF_Get.

public static void generateJLRF_Get(ClassWriter cw, String classname) {
    FieldVisitor fv = cw.visitField(ACC_PUBLIC + ACC_STATIC, jlrfGetMember, "Ljava/lang/reflect/Method;", null, null);
    fv.visitEnd();
    MethodVisitor mv = cw.visitMethod(ACC_PRIVATE + ACC_STATIC, jlrfGetMember, jlrfGetDescriptor, null, new String[] { "java/lang/IllegalAccessException", "java/lang/IllegalArgumentException" });
    mv.visitCode();
    Label l0 = new Label();
    Label l1 = new Label();
    Label l2 = new Label();
    mv.visitTryCatchBlock(l0, l1, l2, "java/lang/Exception");
    Label l3 = new Label();
    mv.visitLabel(l3);
    mv.visitFieldInsn(GETSTATIC, classname, jlrfGetMember, "Ljava/lang/reflect/Method;");
    mv.visitJumpInsn(IFNONNULL, l0);
    Label l4 = new Label();
    mv.visitLabel(l4);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Field", "get", "(Ljava/lang/Object;)Ljava/lang/Object;", false);
    mv.visitInsn(ARETURN);
    mv.visitLabel(l0);
    mv.visitFieldInsn(GETSTATIC, classname, jlrfGetMember, "Ljava/lang/reflect/Method;");
    mv.visitInsn(ACONST_NULL);
    mv.visitInsn(ICONST_2);
    mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
    mv.visitInsn(DUP);
    mv.visitInsn(ICONST_0);
    // target field
    mv.visitVarInsn(ALOAD, 0);
    mv.visitInsn(AASTORE);
    mv.visitInsn(DUP);
    mv.visitInsn(ICONST_1);
    // instance on which to get the field
    mv.visitVarInsn(ALOAD, 1);
    mv.visitInsn(AASTORE);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Method", "invoke", "(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;", false);
    mv.visitLabel(l1);
    mv.visitInsn(ARETURN);
    mv.visitLabel(l2);
    mv.visitVarInsn(ASTORE, 2);
    Label l5 = new Label();
    mv.visitLabel(l5);
    Label l6 = new Label();
    mv.visitLabel(l6);
    mv.visitInsn(ACONST_NULL);
    mv.visitInsn(ARETURN);
    Label l7 = new Label();
    mv.visitLabel(l7);
    mv.visitMaxs(8, 4);
    mv.visitEnd();
}