llvm dev - Sep 2010 - [LLVMdev] Generating Consistent Instruction IDs

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!

Stefan Bucur

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

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