[llvm-dev] [RFC][ThinLTO] llvm-dis ThinLTO summary dump format

[Mehdi AMINI via llvm-dev]

Oh I just see that there were already a bunch of answers. I missed the
thread, sorry.

So basically my intuitive approach on this is close to what I perceive
Peter's position is:

- don't create a new format if there is already one.
- if you really have a good reason to create a new format, it should
replace the existing one (i.e. don't maintain two).
- ideally we should be able to pipe the output if llvm-dis to llvm-as in a
lossless manner (if our layering requires to use another tool than llvm-as,
so be it).

-- 
Mehdi



2017-06-02 20:36 GMT-07:00 Mehdi AMINI <joker.eph at gmail.com>:

>
>
> 2017-06-02 8:46 GMT-07:00 Charles Saternos via llvm-dev <
> llvm-dev at lists.llvm.org>:
>
>> Hey all,
>>
>> Below is the proposed format for the dump of the ThinLTO module summary
>> in the llvm-dis utility:
>>
>
> Our format are usually both way: you have to be able to parse them back.
>
>
>>
>> > ../build/bin/llvm-dis t.o && cat t.o.ll
>> ; ModuleID = '2.o'
>> source_filename = "2.ll"
>> target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
>> target triple = "x86_64-unknown-linux-gnu"
>>
>> @X = constant i32 42, section "foo", align 4
>>
>> @a = weak alias i32, i32* @X
>>
>> define void @afun() {
>>   %1 = load i32, i32* @a
>>   ret void
>> }
>>
>> define void @testtest() {
>>   tail call void @boop()
>>   ret void
>> }
>>
>> declare void @boop()
>>
>> ; Module summary:
>> ;  testtest (External linkage)
>> ;    Function (2 instructions)
>> ;    Calls: boop
>> ;  X (External linkage)
>> ;    Global Variable
>> ;  afun (External linkage)
>> ;    Function (2 instructions)
>> ;    Refs:
>> ;      a
>> ;  a (Weak any linkage)
>> ;    Alias (aliasee X)
>>
>> I've implemented the above format in the llvm-dis utility, since there
>> currently isn't really a way of getting ThinLTO summaries in a
>> human-readable format.
>>
>
> What about the YAML serialization?
>
> --
> Mehdi
>
>
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