llvm dev - Jul 2010 - [LLVMdev] How to use data structure of another pass

In LLVM, we generally use data structure of another pass by
implementing getAnalysisUsage (AnalysisUsage &AU) method. Suppose
SOURCE/lib/Transform directory I have added one pass named as pass_1, which
calculates all expressions in a program and stores all of them in an Expr
array(take it now for granted). Now I added another pass named as pass_2 in
the same directory to print all these expression. How do I do this?


-- 
regards,
soumya prasad ukil
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Soumya_Prasad_Ukil wrote:
>
>      In LLVM, we generally use data structure of another pass by 
> implementing getAnalysisUsage (AnalysisUsage &AU) method. Suppose 
> SOURCE/lib/Transform directory I have added one pass named as pass_1, 
> which calculates all expressions in a program and stores all of them 
> in an Expr array(take it now for granted). Now I added another pass 
> named as pass_2 in the same directory to print all these expression. 
> How do I do this?
The pass_1 pass will need to implement a method that returns the array 
of expressions (or a reference to it).  The pass_2 pass can then use 
getAnalysis<pass_1>() to get a reference to the pass_1 object and call 
this method on the pass_1 object to get the array of expressions.

-- John T.
>
>
> -- 
> regards,
> soumya prasad ukil

Can  you tell me where pass_1 is defined? You have used it inside
getAnalysis<pass_1>(). Is it the name we generally give to a pass while
registry? In this case, don't I need to use getAnalysisUsage (AnalysisUsage
&AU)  function?



On 20 July 2010 02:55, John Criswell <criswell at uiuc.edu> wrote:
> Soumya_Prasad_Ukil wrote:
>
>>
>>     In LLVM, we generally use data structure of another pass by
>> implementing getAnalysisUsage (AnalysisUsage &AU) method. Suppose
>> SOURCE/lib/Transform directory I have added one pass named as pass_1,
which
>> calculates all expressions in a program and stores all of them in an
Expr
>> array(take it now for granted). Now I added another pass named as
pass_2 in
>> the same directory to print all these expression. How do I do this?
>>
>
> The pass_1 pass will need to implement a method that returns the array of
> expressions (or a reference to it).  The pass_2 pass can then use
> getAnalysis<pass_1>() to get a reference to the pass_1 object and
call this
> method on the pass_1 object to get the array of expressions.
>
> -- John T.
>
>
>>
>> --
>> regards,
>> soumya prasad ukil
>>
>
>

-- 
regards,
soumya prasad ukil
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