Method: FFI::Function#attach

Defined in:
ext/ffi_c/Function.c

#attach(m, name) ⇒ self

Attach a Function to the Module m as name.

Parameters:

Returns:



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# File 'ext/ffi_c/Function.c', line 378

static VALUE
function_attach(VALUE self, VALUE module, VALUE name)
{
    Function* fn;
    char var[1024];

    Data_Get_Struct(self, Function, fn);

    if (fn->info->parameterCount == -1) {
        rb_raise(rb_eRuntimeError, "cannot attach variadic functions");
        return Qnil;
    }

    if (!rb_obj_is_kind_of(module, rb_cModule)) {
        rb_raise(rb_eRuntimeError, "trying to attach function to non-module");
        return Qnil;
    }

    if (fn->methodHandle == NULL) {
        fn->methodHandle = rbffi_MethodHandle_Alloc(fn->info, fn->base.memory.address);
    }

    /*
     * Stash the Function in a module variable so it does not get garbage collected
     */
    snprintf(var, sizeof(var), "@@%s", StringValueCStr(name));
    rb_cv_set(module, var, self);

    rb_define_singleton_method(module, StringValueCStr(name),
            rbffi_MethodHandle_CodeAddress(fn->methodHandle), -1);


    rb_define_method(module, StringValueCStr(name),
            rbffi_MethodHandle_CodeAddress(fn->methodHandle), -1);

    return self;
}