[cfe-dev] Is clang_reparseTranslationUnit reentrant?

Jan Erik Hanssen jhanssen at gmail.com
Sun Apr 28 20:45:37 PDT 2013

I have some more information for my problem, the crash seemingly only
happens when the program is calling clang_reparseTranslationUnit and the
source file is being changed from a different process at the exact same
time. Does reparsing require passing the source file as a CXUnsavedFile? If
so, does that only go for the main source file or does it apply for all
included files as well?

These are the first few frames of what gdb tells me when the program

#0  0x00007ffff5aef423 in ComputeLineNumbers(clang::DiagnosticsEngine&,
clang::SrcMgr::ContentCache*, llvm::BumpPtrAllocator&, clang::SourceManager
const&, bool&) () from /usr/local/clang-3.3/lib/libclang.so
#1  0x00007ffff5aef15d in
clang::SourceManager::getLineNumber(clang::FileID, unsigned int, bool*)
const () from /usr/local/clang-3.3/lib/libclang.so
#2  0x00007ffff5aeef64 in
clang::SourceManager::getPresumedLoc(clang::SourceLocation, bool) const ()
from /usr/local/clang-3.3/lib/libclang.so
#3  0x00007ffff5abffe8 in
clang::Preprocessor::ExpandBuiltinMacro(clang::Token&) () from
#4  0x00007ffff5abf659 in
clang::MacroDirective*) () from /usr/local/clang-3.3/lib/libclang.so
#5  0x00007ffff5ad4cf3 in
clang::Preprocessor::HandleIdentifier(clang::Token&) () from

Full stack trace can be found at


On Sun, Apr 28, 2013 at 3:20 AM, jhanssen <jhanssen at gmail.com> wrote:

> Hi,
> I'm involved with a project that's using clang to index source files and
> I'm
> currently having strange crashes in calls to clang_reparseTranslationUnit,
> this seemingly happens both in Clang 3.2 and trunk as of r180688. The
> program is running multiple threads, if I never do a reparse but always do
> a
> full parse from source then I don't see any crashes. I've verified that no
> other threads are touching the same unit when this happens.
> It's not trivial to reproduce, and I've only ever seen it when multiple
> threads are calling into clang at the same time and the source code at the
> same time is not compiling.
> Are there any known problems with clang_reparseTranslationUnit and calling
> that from multiple threads at the same time?
> Thanks!
> --
> View this message in context:
> http://clang-developers.42468.n3.nabble.com/Is-clang-reparseTranslationUnit-reentrant-tp4031793.html
> Sent from the Clang Developers mailing list archive at Nabble.com.
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