[LLVMdev] list of available/valid values near an instruction

[Alexander Poddey]

Ok,
thank you both!


Philip Reames wrote:

> If you're still looking for example code, you can glance at the function
> findLiveGCValuesAtInst in http://reviews.llvm.org/D6975. It does more or
> less exactly this with an extra filtering step.
> 
> Philip
> 
> On 01/14/2015 11:06 AM, Krzysztof Parzyszek wrote:
>> For instructions you can simply iterate over the current basic block
>> from the instruction before the one that you are looking at, up to the
>> beginning of the block.  Then iterate over all instructions in all
>> blocks dominating the current block. (You can get those from the
>> dominator tree, following the immediate-dominator chain.)
>>
>> There is no such iterator that I'm aware of, so you may need to
>> implement your own, but it should be fairly simple.
>>
>> -Krzysztof
>>
>>
>> On 1/14/2015 12:10 PM, Alexander Poddey wrote:
>>>
>>> Hi Krzysztof
>>> yes, they are available. What I want is to have a list of those
>>> values I can
>>> iterate over....
>>>
>>> Alex
>>>> I'm not sure if I understand your question correctly, but all values
>>>> whose definitions dominate the instruction that you are looking at are
>>>> available.  Globals and function arguments are always available in a
>>>> given module or function.
>>>>
>>>> -Krzysztof
>>>>
>>>>
>>>> On 1/14/2015 9:08 AM, Alexander Poddey wrote:
>>>>> I wonder if there is a list of available/valid values (globals,
>>>>> constants
>>>>> arguments,..) in the scope of a given instruction?
>>>>>
>>>>> Background:
>>>>> Iterating over the instructions of a module, i would like to know
>>>>> which
>>>>> values are accessible in the context of the instruction, possibly
>>>>> replacing the instructions operand by a valid available other operand.
>>>>>
>>>>>
>>>>> Thx
>>>>> Alex
>>>>>
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>>>>>
>>>>
>>>>
>>>
>>>
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>>
>>