[llvm-dev] How to read stack map

[Kavindu Gimhan Zoysa via llvm-dev]

Hi All,

I was able to read the stack map. This is my code
https://github.com/KavinduZoysa/test-GCs/tree/master/statepoints

Kavindu Gimhan Zoysa,
BSc(Hons) | ENTC | UoM,
SSE | WSO2

GitHub <https://github.com/KavinduZoysa> LinkedIn
<https://www.linkedin.com/in/kavindu-gimhan-zoysa-85939a122/> Medium
<https://medium.com/@kavindugimhanzoysa>


On Thu, 13 May 2021 at 09:49, Kavindu Gimhan Zoysa <kavindu175 at gmail.com>
wrote:

> Hi Philip,
>
> Let's say my code structure is as follows.
>
>
>>
>>
>>
>>
>>
>>
>>
>> *func foo() {}func bar() {      call foo(); // this is a statepoint}func
>> readLLVMStackMap() {}func main() {      call bar(); // this is a
>> statepoint      call readLLVMStackMap();}*
>
>
> Actually, my question is that how do I read the LLVM Stack map. Simply I
> want to implement *readLLVMStackMap *method, in order to read the LLVM
> Stack Map. What is the best approach should I follow?
>
> Philip, that was my question. So according to your previous answers, What
> I need to do is following this document
> https://llvm.org/docs/StackMaps.html#stack-map-section. Am I right?
>
> Kavindu Gimhan Zoysa,
> BSc(Hons) | ENTC | UoM,
> SSE | WSO2
>
> GitHub <https://github.com/KavinduZoysa> LinkedIn
> <https://www.linkedin.com/in/kavindu-gimhan-zoysa-85939a122/> Medium
> <https://medium.com/@kavindugimhanzoysa>
>
>
> On Thu, 13 May 2021 at 00:14, Philip Reames <listmail at philipreames.com>
> wrote:
>
>> This is generally the right approach, yes.
>>
>> You may also find include/llvm/Object/StackMapParser.h helpful.
>>
>> Philip
>> On 5/12/21 2:52 AM, Kavindu Gimhan Zoysa wrote:
>>
>> This is what I followed.
>> https://stackoverflow.com/questions/8045108/use-label-in-assembly-from-c
>>
>> Kavindu Gimhan Zoysa,
>> BSc(Hons) | ENTC | UoM,
>> SSE | WSO2
>>
>> GitHub <https://github.com/KavinduZoysa> LinkedIn
>> <https://www.linkedin.com/in/kavindu-gimhan-zoysa-85939a122/> Medium
>> <https://medium.com/@kavindugimhanzoysa>
>>
>>
>> On Wed, 12 May 2021 at 12:45, Kavindu Gimhan Zoysa <kavindu175 at gmail.com>
>> wrote:
>>
>>> Hi all,
>>>
>>> I was able to generate the Stack Map which is shown here
>>> https://llvm.org/docs/StackMaps.html#stack-map-format. Now I want to
>>> read those entries. What I did was, I manually change the .s file as shown
>>> below (Added the *.globl __LLVM_StackMaps *manually). Then I can read
>>> the entries using C code.
>>>
>>> .globl __LLVM_StackMaps
>>> __LLVM_StackMaps:
>>> .byte 3
>>> .byte 0
>>> .short 0
>>>
>>> I want to know, whether this is the correct approach. If not could you
>>> please suggest me the correct approach?
>>>
>>> Really appreciate your input on this.
>>>
>>> Thank you,
>>> Kavindu
>>>
>>> Kavindu Gimhan Zoysa,
>>> BSc(Hons) | ENTC | UoM,
>>> SSE | WSO2
>>>
>>> GitHub <https://github.com/KavinduZoysa> LinkedIn
>>> <https://www.linkedin.com/in/kavindu-gimhan-zoysa-85939a122/> Medium
>>> <https://medium.com/@kavindugimhanzoysa>
>>>
>>
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