[LLVMdev] Segmentation fault 'cause of accessing function arguments
Xiaolong Tang
xiaolong.snake at gmail.com
Wed Jun 9 07:29:58 PDT 2010
Hi all,
I am experimenting to run a pass inherited from CallGraphSCCPass. In
the pass, I iterate all functions in a SCC. In each iteration, I
access all arguments of a function in the following way:
Function::arg_iterator PI = fun->arg_begin(), PE = fun->arg_end();
...
I have no trouble with building. However, I am troubled with
"segmentation fault" when I run the pass via:
opt -load ../../build-llvm/Debug/lib/LLVMRCI.dylib -rci < a.out.bc
The error message is attached later.
So, am I wrong with accessing function arguments?
What are the possible causes?
Thanks,
Xiaolong
PS: ERROR MESSAGE
Identify an SCC. The number of function: 1
0 opt 0x0000000100426a32 PrintStackTrace(void*) + 38
1 opt 0x0000000100426e8c SignalHandler(int) + 254
2 libSystem.B.dylib 0x00007fff82a9880a _sigtramp + 26
3 LLVMRCI.dylib 0x000000010148e6ae (anonymous namespace)::RCI::ID + 16462
4 opt 0x0000000100010e89 llvm::Function::hasLazyArguments() const + 21
5 opt 0x00000001000114e3 llvm::Function::CheckLazyArguments() const + 21
6 opt 0x000000010013a421 llvm::Function::arg_begin() + 21
7 LLVMRCI.dylib 0x0000000101483e02 (anonymous namespace)::RCI::runOnSCC(llvm::CallGraphSCC&) + 184
8 opt 0x0000000100205686 (anonymous namespace)::CGPassManager::RunPassOnSCC(llvm::Pass*, llvm::CallGraphSCC&, llvm::CallGraph&, bool&, bool&) + 230
9 opt 0x0000000100205abe (anonymous namespace)::CGPassManager::RunAllPassesOnSCC(llvm::CallGraphSCC&, llvm::CallGraph&, bool&) + 488
10 opt 0x0000000100205d60 (anonymous namespace)::CGPassManager::runOnModule(llvm::Module&) + 352
11 opt 0x00000001003bc064 llvm::MPPassManager::runOnModule(llvm::Module&) + 384
12 opt 0x00000001003bd80d llvm::PassManagerImpl::run(llvm::Module&) + 111
13 opt 0x00000001003bd86f llvm::PassManager::run(llvm::Module&) + 33
14 opt 0x0000000100066d3b main + 3420
15 opt 0x000000010005c1c4 start + 52
16 opt 0x0000000000000004 start + 4294590068
Stack dump:
0. Program arguments: opt -load ../../build-llvm/Debug/lib/LLVMRCI.dylib -rci
1. Running pass 'CallGraph Pass Manager' on module '<stdin>'.
Segmentation fault
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