Package org.springframework.asm

Examples of org.springframework.asm.ClassWriter.visitMethod()

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    String clazzName = "spel/Ex" + getNextSuffix();
    ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS|ClassWriter.COMPUTE_FRAMES);
    cw.visit(V1_5, ACC_PUBLIC, clazzName, null, "org/springframework/expression/spel/CompiledExpression", null);

    // Create default constructor
    MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKESPECIAL, "org/springframework/expression/spel/CompiledExpression",
        "<init>", "()V", false);
    mv.visitInsn(RETURN);
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    mv.visitInsn(RETURN);
    mv.visitMaxs(1, 1);
    mv.visitEnd();

    // Create getValue() method
    mv = cw.visitMethod(ACC_PUBLIC, "getValue",
        "(Ljava/lang/Object;Lorg/springframework/expression/EvaluationContext;)Ljava/lang/Object;", null,
        new String[ ]{"org/springframework/expression/EvaluationException"});
    mv.visitCode();

    CodeFlow cf = new CodeFlow(clazzName, cw);
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    fv.visitEnd();

    String voidNoArgMethodDescriptor = Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] {});

    // field class loading
    MethodVisitor mv = cw.visitMethod(ACC_STATIC, CINIT, voidNoArgMethodDescriptor, null, null);
    mv.visitCode();
    mv.visitLdcInsn(Type.getType(clazz));
    mv.visitFieldInsn(PUTSTATIC, className, CLASS_FIELD_NAME, CLASS_DESCRIPTOR);
    mv.visitInsn(RETURN);
    mv.visitMaxs(1, 0);
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    String voidArgClassAndIntDescriptor = Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] {
        Type.getType(Class.class), Type.INT_TYPE });

    // default constructor
    mv = cw.visitMethod(ACC_PUBLIC, INIT, voidNoArgMethodDescriptor, null, null);
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETSTATIC, className, CLASS_FIELD_NAME, CLASS_DESCRIPTOR);
    mv.visitFieldInsn(GETSTATIC, className, ID_FIELD_NAME, Type.INT_TYPE.getDescriptor());
    mv.visitMethodInsn(INVOKESPECIAL, className, INIT, voidArgClassAndIntDescriptor);
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    mv.visitInsn(RETURN);
    mv.visitMaxs(3, 1);
    mv.visitEnd();

    // two-arg constructor
    mv = cw.visitMethod(ACC_PUBLIC, INIT, voidArgClassAndIntDescriptor, null, null);
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitVarInsn(ILOAD, 2);
    mv.visitMethodInsn(INVOKESPECIAL, INSTANTIATOR_NAME, INIT, voidArgClassAndIntDescriptor);
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    Type customClassType = Type.getType(clazz);
    String customTypeNoArgDesc = Type.getMethodDescriptor(customClassType, new Type[] {});

    // newInstance overloaded method
    mv = cw.visitMethod(ACC_PUBLIC, NEW_INSTANCE, customTypeNoArgDesc, null, null);

    mv.visitCode();
    mv.visitTypeInsn(NEW, customClassType.getInternalName());
    mv.visitInsn(DUP);
    mv.visitMethodInsn(INVOKESPECIAL, customClassType.getInternalName(), INIT, voidNoArgMethodDescriptor);
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    mv.visitInsn(ARETURN);
    mv.visitMaxs(2, 1);
    mv.visitEnd();

    // plus original method signature
    mv = cw.visitMethod(ACC_PUBLIC + ACC_BRIDGE + ACC_SYNTHETIC, NEW_INSTANCE, NEW_INSTANCE_DESC, null, null);
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKEVIRTUAL, className, NEW_INSTANCE, customTypeNoArgDesc);
    mv.visitInsn(ARETURN);
    mv.visitMaxs(1, 1);
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