[LLVMbugs] [Bug 4591] New: uninitialized LLVMContext used by InstructionCombining pass . Kaleidoscope testcase crash.

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4591

           Summary: uninitialized LLVMContext used by InstructionCombining
                    pass. Kaleidoscope testcase crash.
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: xerxes at zafena.se
                CC: llvmbugs at cs.uiuc.edu


Testcase:
echo "def test(x) 1+x;" | Kaleidoscope
ready> ready> Stack dump:
0.      Running pass 'Combine redundant instructions' on function '@test'
Segmenteringsfel

(gdb) bt
#0  0x08199c16 in llvm::LLVMContext::getConstantFP (this=0x0, V=@0xbfd3a004) at
/home/xerxes/llvm/lib/VMCore/LLVMContext.cpp:485
#1  0x0819b534 in llvm::LLVMContext::getNullValue (this=0x0, Ty=0x8a661c8) at
/home/xerxes/llvm/lib/VMCore/LLVMContext.cpp:46
#2  0x0819b7fa in llvm::LLVMContext::getConstantFPNegativeZero (this=0x0,
Ty=0x8a661c8) at /home/xerxes/llvm/lib/VMCore/LLVMContext.cpp:521
#3  0x082cdf68 in visitFAdd (this=0x8a8c310, I=@0x8a92d58) at
/home/xerxes/llvm/lib/Transforms/Scalar/InstructionCombining.cpp:2377
#4  0x08310a5c in visit (this=0x8a8c310, I=@0x0) at
/home/xerxes/llvm/include/llvm/Instruction.def:108
#5  0x0831412c in DoOneIteration (this=0x8a8c310, F=@0x8a92840, Iteration=0) at
/home/xerxes/llvm/lib/Transforms/Scalar/InstructionCombining.cpp:13079
#6  0x08314b6d in runOnFunction (this=0x8a8c310, F=@0x8a92840) at
/home/xerxes/llvm/lib/Transforms/Scalar/InstructionCombining.cpp:13157
#7  0x081b15c7 in llvm::FPPassManager::runOnFunction (this=0x8a8a990,
F=@0x8a92840) at /home/xerxes/llvm/lib/VMCore/PassManager.cpp:1372
#8  0x081b19da in llvm::FunctionPassManagerImpl::run (this=0x8a89360,
F=@0x8a92840) at /home/xerxes/llvm/lib/VMCore/PassManager.cpp:1324
#9  0x081b1c0f in llvm::FunctionPassManager::run (this=0xbfd3a8c4,
F=@0x8a92840) at /home/xerxes/llvm/lib/VMCore/PassManager.cpp:1254
#10 0x0812aad4 in FunctionAST::Codegen (this=0x8a92728) at
/home/xerxes/llvm/examples/Kaleidoscope/toy.cpp:989
#11 0x0812ec8f in main () at
/home/xerxes/llvm/examples/Kaleidoscope/toy.cpp:1010
(gdb) 

On frame #3 InstructionCombining.cpp:2377 the instruction combining pass calls
a static function of a uninitialised LLVMContext that eventually results into a
crash when the Context wants to dereference the LLVMContext::pImpl pointer in
frame #0.


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