[cfe-dev] [Bug] Segmentation fault while getting SourceLocation of a Decl

[Hugues de Lassus]

Hi,

I am iterating on an std::map whose keys are FunctionDecl's pointers. 
Many times I encounter no problems, but sometimes I get segfaults for 
specific C files and I do not manage to find out why nor where parsed C 
code might produces such a bug.

Every time it happens when calling clang::FunctionDecl::getNameInfo() 
and then clang::Decl::getLocation()

I am wondering whether the getNameInfo/getLocation functions are always 
safe or not ? Do you think it has to come from my tool ? Thanks for the 
help !

Here is an example backtrace:

Program received signal SIGSEGV, Segmentation fault.
0x0000000000544bb6 in clang::Decl::getLocation (this=0x21) at 
/import/linux/x86_64/soft/llvm/3.4/include/clang/AST/DeclBase.h:373
373      SourceLocation getLocation() const { return Loc; }
(gdb) bt
#0  0x0000000000544bb6 in clang::Decl::getLocation (this=0x21) at 
/import/linux/x86_64/soft/llvm/3.4/include/clang/AST/DeclBase.h:373
#1  0x0000000000544c14 in clang::FunctionDecl::getNameInfo (this=0x21) 
at /import/linux/x86_64/soft/llvm/3.4/include/clang/AST/Decl.h:1605
#2  0x000000000054454f in DotGraph::printDotGraph (this=0x7fffffffe260, 
IOInfo=0x14eb110) at DotGraph.cpp:32
#3  0x000000000058e27d in main (argc=4, argv=0x7fffffffe658) at main.cpp:73

-- 

Hugues de Lassus Saint-Geniès