search for: processfunctionbeforeframefin

Hi, Target overrides of processFunctionBeforeFrameFinalized() are misused in two cases (MBlaze and PowerPC) to set the offsets of objects. Unfortunately this has no effect because the offsets are immediately reset by calculateFrameObjectOffsets(). The PowerPC backend does this to setup the stack frame layout according to the ABI. Ie. it spills the r...

Hi Anton, Anton Korobeynikov wrote: > I don't see any huge problems with writing such pass: just create > stack frame objects at fixed offsets inside your MF pass - and you'll > done. The only problem is that you need to do this early - before > prologue / epilogue inserter code runs, since afterwards stack frame > layout is almostly finalized (at "high level")

...icolas > Could you point me where those hooks are in the llvm code? I didn't find > any. Look into PrologEpilogInserter.cpp::PEI::runOnMachineFunction(). There are calls to hooks inside TargetRegisterInfo: TargetRegisterInfo::processFunctionBeforeCalleeSavedScan() and TargetRegisterInfo::processFunctionBeforeFrameFinalized(). Maybe they are not so convenient when working via JIT but at least you'll know the place, where all stack-related stuff is being cooked :) -- With best regards, Anton Korobeynikov Faculty of Mathematics and Mechanics, Saint Petersburg State University

Hi, All I am trying to implement a llvm backend. But I encountered the following problem when running the backend: "Fatal error: error in backend: WinEH not implemented for this target" This error is triggered by function processFunctionBeforeFrameFinalized() defined in class TargetFrameLowering. Can anyone help? Thanks a lot! Zhiguo [cid:image001.jpg at 01D50970.C9344210] -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20190513/6d866094/attachment-0001....