Examples of jnr.ffi.Variable

jnr.ffi.Variable

Access library global variables.

To access global variables, declare a method with a parameterized return type of this class.

Example

 {@code}public interface MyLib  public Variable my_int_var(); } MyLib lib = LibraryLoader.create(MyLib.class).load("mylib"): System.out.println("native value=" + lib.my_int_var().get()) lib.my_int_var().set(0xdeadbeef); }

        jnr.ffi.mapper.FromNativeType fromNativeType = typeMapper.getFromNativeType(signatureType, context);
        FromNativeConverter fromNativeConverter = fromNativeType != null ? fromNativeType.getFromNativeConverter() : null;
        jnr.ffi.mapper.ToNativeType toNativeType = typeMapper.getToNativeType(signatureType, context);
        ToNativeConverter toNativeConverter = toNativeType != null ? toNativeType.getToNativeConverter() : null;


        Variable variableAccessor = buildVariableAccessor(builder.getRuntime(), address, interfaceClass, javaType, annotations,
                toNativeConverter, fromNativeConverter, classLoader);
        SkinnyMethodAdapter mv = new SkinnyMethodAdapter(builder.getClassVisitor(), ACC_PUBLIC | ACC_FINAL,
                variableName, sig(Variable.class), null, null);
        mv.start();
        mv.aload(0);

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        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);
        Variable variable;
        Pointer memory = MemoryUtil.newPointer(runtime, symbolAddress);
        variable = getNativeVariableAccessor(memory, toNativeType, fromNativeType);
        return toNativeType.getToNativeConverter() != null
                ? getConvertingVariable(variable, toNativeType.getToNativeConverter(), fromNativeType.getFromNativeConverter())
                : variable;

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        jnr.ffi.mapper.FromNativeType fromNativeType = typeMapper.getFromNativeType(signatureType, context);
        FromNativeConverter fromNativeConverter = fromNativeType != null ? fromNativeType.getFromNativeConverter() : null;
        jnr.ffi.mapper.ToNativeType toNativeType = typeMapper.getToNativeType(signatureType, context);
        ToNativeConverter toNativeConverter = toNativeType != null ? toNativeType.getToNativeConverter() : null;


        Variable variableAccessor = buildVariableAccessor(builder.getRuntime(), address, interfaceClass, javaType, annotations,
                toNativeConverter, fromNativeConverter, classLoader);
        SkinnyMethodAdapter mv = new SkinnyMethodAdapter(builder.getClassVisitor(), ACC_PUBLIC | ACC_FINAL,
                variableName, sig(Variable.class), null, null);
        mv.start();
        mv.aload(0);

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        Class boxedType = toNativeConverter != null ? toNativeConverter.nativeType() : javaType;
        NativeType nativeType = Types.getType(runtime, boxedType, annotations).getNativeType();
        jnr.ffi.provider.ToNativeType toNativeType = new jnr.ffi.provider.ToNativeType(javaType, nativeType, annotations, toNativeConverter, null);
        jnr.ffi.provider.FromNativeType fromNativeType = new jnr.ffi.provider.FromNativeType(javaType, nativeType, annotations, fromNativeConverter, null);
        Variable variable;
        Pointer memory = MemoryUtil.newPointer(runtime, symbolAddress);
        variable = getNativeVariableAccessor(memory, toNativeType, fromNativeType);
        return toNativeType.getToNativeConverter() != null
                ? getConvertingVariable(variable, toNativeType.getToNativeConverter(), fromNativeType.getFromNativeConverter())
                : variable;

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            String functionName = functionMapper.mapFunctionName(method.getName(), new NativeFunctionMapperContext(library, annotations));
            long symbolAddress = library.getSymbolAddress(functionName);
            if (symbolAddress == 0L) {
                return new FunctionNotFoundInvoker(method, functionName);
            }
            Variable variable = ReflectionVariableAccessorGenerator.createVariableAccessor(runtime, method, symbolAddress,
                    typeMapper, annotations);
            return new VariableAcccessorInvoker(variable);
        }

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Related Classes of jnr.ffi.Variable

jnr.ffi.provider.jffi.ReflectionLibraryLoader$LazyLoader

jnr.ffi.provider.jffi.ReflectionVariableAccessorGenerator

jnr.ffi.provider.jffi.VariableAccessorGenerator

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