[LLVMdev] Generating Consistent Instruction IDs

[Stefan Bucur]

On Wed, Sep 8, 2010 at 7:16 PM, Devang Patel <dpatel at apple.com> wrote:
>
> On Sep 8, 2010, at 5:12 AM, Stefan Bucur wrote:
>
>> Hi,
>>
>> I'd like to ask you what's the best way of generating instruction
>> identifiers which are consistent across independent invocations of the
>> LLVM program. One way would be to use a counter and iterate over all
>> the functions, then all the BBs. But are there any guarantees on the
>> ordering of the functions and BBs in the iteration? In extremis, I can
>> sort the functions after name, but what about the basic blocks?
>>
>> Thanks!
>
> How do you intend to use these IDs ?
> -
> Devang
>

For tracking cumulative code coverage across multiple executions. Each
ID would be an index into a bitfield, so I would need the same ID to
refer to the same instruction from one execution to the other.

Stefan