[llvm-dev] Assertion fail/crash in X86FrameLowering::GetFrameIndexReference SEH

[Carlo Kok via llvm-dev]

This turned out to be related to reusing the local used in the catchpad, 
for example given the following c++ code:

extern void rthrow();

int main() {
     try
     {
         try {
             rthrow();
         } catch(int* v) {
             rthrow();
         }
     } catch (int* v)
     {
         rthrow();
     }
     return 0;
}

Generates two:

   %7 = catchpad within %5 [%rtti.TypeDescriptor4* @"\01??_R0PAH at 8", i32 
0, i32** %2]
   %11 = catchpad within %9 [%rtti.TypeDescriptor4* @"\01??_R0PAH at 8", 
i32 0, i32** %3]

If I change either of them to have the %2 in both, it crashes llvm.

On 2016-10-17 18:02, Carlo Kok via llvm-dev wrote:
> Hi,
>
> I'm gettign an assertion fail/crash in
> X86FrameLowering::GetFrameIndexReference when compiling the following
> bitcode:
>
> https://gist.github.com/carlokok/868cddebeb9acc8ccbac6253de0480b0
>
> I tried removing the llvm.frameaddres calls but that's not it, where can
> I start looking for what my mistake here is? Code seems to verify just
> fine.
>
>
> ; #0 0x00e1afe8 llvm::X86FrameLowering::getFrameIndexReference(class
> llvm::MachineFunction const &,int,unsigned int &)const
> c:\p\llvm\llvm\lib\target\x86\x86framelowering.cpp:1672:0
> ; #1 0x00f99010 llvm::WinException::getFrameIndexOffset(int,struct
> llvm::WinEHFuncInfo const &)
> c:\p\llvm\llvm\lib\codegen\asmprinter\winexception.cpp:320:0
> ; #2 0x00f97f75 llvm::WinException::emitCXXFrameHandler3Table(class
> llvm::MachineFunction const *,bool)
> c:\p\llvm\llvm\lib\codegen\asmprinter\winexception.cpp:805:0
> ; #3 0x00f98e77 llvm::WinException::endFunction(class
> llvm::MachineFunction const *)
> c:\p\llvm\llvm\lib\codegen\asmprinter\winexception.cpp:146:0
> ; #4 0x00f685f7 llvm::AsmPrinter::EmitFunctionBody(void)
> c:\p\llvm\llvm\lib\codegen\asmprinter\asmprinter.cpp:978:0
> ; #5 0x00d307fa llvm::X86AsmPrinter::runOnMachineFunction(class
> llvm::MachineFunction &)
> c:\p\llvm\llvm\lib\target\x86\x86asmprinter.cpp:73:0
> ; #6 0x01021d1b llvm::MachineFunctionPass::runOnFunction(class
> llvm::Function &) c:\p\llvm\llvm\lib\codegen\machinefunctionpass.cpp:64:0
> ; #7 0x011a8f40 llvm::FPPassManager::runOnFunction(class llvm::Function
> &) c:\p\llvm\llvm\lib\ir\legacypassmanager.cpp:1522:0
> ; #8 0x011a9083 llvm::FPPassManager::runOnModule(class llvm::Module &)
> c:\p\llvm\llvm\lib\ir\legacypassmanager.cpp:1542:0
> ; #9 0x011a9202 `anonymous namespace'::MPPassManager::runOnModule
> c:\p\llvm\llvm\lib\ir\legacypassmanager.cpp:1599:0
> ; #10 0x011a8b49 llvm::legacy::PassManagerImpl::run(class llvm::Module
> &) c:\p\llvm\llvm\lib\ir\legacypassmanager.cpp:1703:0
> ; #11 0x00aee750 compileModule c:\p\llvm\llvm\tools\llc\llc.cpp:508:0
> ; #12 0x00af2e2a main c:\p\llvm\llvm\tools\llc\llc.cpp:273:0
> ; #13 0x015b7e28 _scrt_common_main_seh
> f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253:0
> ; #14 0x769e62c4 (C:\WINDOWS\System32\KERNEL32.DLL+0x162c4)
> ; #15 0x772f0609 (C:\WINDOWS\SYSTEM32\ntdll.dll+0x60609)
> ; #16 0x772f05d4 (C:\WINDOWS\SYSTEM32\ntdll.dll+0x605d4)
>
>
> bitcode: https://gist.github.com/carlokok/868cddebeb9acc8ccbac6253de0480b0
>

-- 
Carlo Kok
RemObjects Software