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

[Philip Reames]

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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>
>