On Tue, Aug 3, 2010 at 12:12 AM, Ted Kremenek <[email protected]> wrote:
> On Aug 1, 2010, at 9:56 PM, Zhongxing Xu <[email protected]> wrote:
>
>> +/// Represent a region's offset within the top level base region.
>> +class RegionOffset {
>> +  /// The base region.
>> +  const MemRegion *R;
>> +
>> +  /// The bit offset within the base region. It shouldn't be negative.
>> +  uint64_t Offset;
>
> Why is the offset guaranteed to be non-negative?  Can't we construct 
> ElementRegions with a negative index?
>

Because the offset is within the toplevel object region and used for
representing region bindings, binding to a negative index is illegal.

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