llvm dev - Jul 2017 - Value

Hello,
I am trying to write my own pass for some purposes, and found out that
there is no way to work with such variables as %1 and so on. How they are
identifiable? Only by the Value object, without any possibility for visual
representation as for example %a, %b values?
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Hi Anastasiya,


What do you mean 'identifiable'? You have Module, Function, BasicBlock
etc. You can access Values and Users. They form a data-flow graph. You can store
pointers to Values and Users if you wish. If you want a name for any Value there
is ValueSymbolTable
(http://www.llvm.org/docs/ProgrammersManual.html#advanced-topics) which provides
a symbol table that the Function and Module classes use for naming value
definitions. You should take into account that some Values might not have names
and passes can change names of Values.


Thanks,

Evgeny Astigevich

________________________________
From: llvm-dev <llvm-dev-bounces at lists.llvm.org> on behalf of
Anastasiya Ruzhanskaya via llvm-dev <llvm-dev at lists.llvm.org>
Sent: Thursday, July 20, 2017 2:21:44 PM
To: LLVM Developers Mailing List
Subject: [llvm-dev] Value

Hello,
I am trying to write my own pass for some purposes, and found out that there is
no way to work with such variables as %1 and so on. How they are identifiable?
Only by the Value object, without any possibility for visual representation as
for example %a, %b values?
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Thank you! I wanted to use the right part of the instruction ,
 %a = alloca i32, align 4 - %a here , but I don't quite understand the
difference between Instruction object and Value object of a, which is used
further , and in this case :
%1 = alloca i32, align 4 - I also wanted to use %1 and in this case the
only possibility is Instruction object.

2017-07-20 15:32 GMT+02:00 Evgeny Astigeevich <Evgeny.Astigeevich at
arm.com>:
> Hi Anastasiya,
>
>
> What do you mean 'identifiable'? You have Module, Function,
BasicBlock
> etc. You can access Values and Users. They form a data-flow graph. You can
> store pointers to Values and Users if you wish. If you want a name for any
> Value there is ValueSymbolTable (http://www.llvm.org/docs/
> ProgrammersManual.html#advanced-topics) which provides a symbol table
> that the Function and Module classes use for naming value definitions. You
> should take into account that some Values might not have names and passes
> can change names of Values.
>
>
> Thanks,
>
> Evgeny Astigevich
> ------------------------------
> *From:* llvm-dev <llvm-dev-bounces at lists.llvm.org> on behalf of
> Anastasiya Ruzhanskaya via llvm-dev <llvm-dev at lists.llvm.org>
> *Sent:* Thursday, July 20, 2017 2:21:44 PM
> *To:* LLVM Developers Mailing List
> *Subject:* [llvm-dev] Value
>
> Hello,
> I am trying to write my own pass for some purposes, and found out that
> there is no way to work with such variables as %1 and so on. How they are
> identifiable? Only by the Value object, without any possibility for visual
> representation as for example %a, %b values?
>
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