[llvm-dev] How to invoke the print method in MachineFunctionPass

[Matthias Braun via llvm-dev]

Actually it seems Pass:dump() is calling Pass::print() and the dump() functions is used in a couple places throughout CodeGen for debug printing. So that's why ::print is implemented at all.

> On Nov 7, 2018, at 4:58 PM, Matthias Braun via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> I suspect you cannot :-/
> 
> As far as I understand the code, you would need to put a FunctionPassPrinter into the pass pipeline, and I right now I don't see any code in llc that would do that. Maybe we should just remove LiveIntervals::print() given that nobody can use it (or someone could implement an -analyze for llc).
> 
> In practice this works for me to inspect live intervals (but technically it isn't using LiveIntervals::print):
> 
> $ llc -debug-only=regalloc -run-pass=liveintervals test.mir
> 
> - Matthias
> 
>> On Nov 7, 2018, at 2:12 AM, Samolisov Pavel via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
>> 
>> Hello everyone.
>> 
>> I'm looking for a way how to invoke the 'print(raw_ostream &OS, const Module*)' method in MachineFunctionPass. If we have a 'usual' pass, which can be used by the 'opt' tool, we can just pass the '-analyze' command line argument but what about the 'llc' compiler?
>> 
>> As I can see, there is an implementation of the 'print(raw_ostream &OS, const Module*)' method in the 'LiveIntervals.cpp'. 
>> void LiveIntervals::print(raw_ostream &OS, const Module* ) const {
>>   OS << "********** INTERVALS **********\n";
>> 
>>   // Dump the regunits.
>> ...
>> The method also is implemented in 'RegisterCoalescer.cpp' (in fact, this method just invokes one from LiveIntervals).
>> Is there a way to invoke the 'print' method implemented in **Machine** pass? If so, could you let me know how I can do it?
>> Thank you.
>> Pavel
>> 
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