[cfe-dev] Valgrind; clang::ASTUnit::Parse -> lost memory?

[Argyrios Kyrtzidis]

Hi Doug,

Can you provide a complete test file the exhibits the leak, that we can compile and investigate ?

-Argyrios

On Nov 7, 2011, at 7:55 PM, Doug wrote:

> Humm, when I run valgrind over my code I'm getting:
> 
> ==30376== 
> ==30376== HEAP SUMMARY:
> ==30376==     in use at exit: 1,928 bytes in 25 blocks
> ==30376==   total heap usage: 28,193 allocs, 28,168 frees, 2,194,616 bytes allocated
> ==30376== 
> ==30376== 1,864 (1,056 direct, 808 indirect) bytes in 1 blocks are definitely lost in loss record 15 of 15
> ==30376==    at 0x4C28973: operator new(unsigned long) (vg_replace_malloc.c:261)
> ==30376==    by 0x57C7A62: clang::ASTUnit::Parse(llvm::MemoryBuffer*) (in /home/doug/projects/cparse/deps/llvm/build/lib/liblibclang.so.3.0)
> ==30376==    by 0x57CB686: clang::ASTUnit::LoadFromCompilerInvocation(bool) (in /home/doug/projects/cparse/deps/llvm/build/lib/liblibclang.so.3.0)
> ==30376==    by 0x57CBF0F: clang::ASTUnit::LoadFromCommandLine(char const**, char const**, llvm::IntrusiveRefCntPtr<clang::DiagnosticsEngine>, llvm::StringRef, bool, bool, std::pair<std::string, llvm::PointerUnion<char const*, llvm::MemoryBuffer const*> >*, unsigned int, bool, bool, clang::TranslationUnitKind, bool, bool) (in /home/doug/projects/cparse/deps/llvm/build/lib/liblibclang.so.3.0)
> ==30376==    by 0x54F5E14: clang_parseTranslationUnit_Impl (in /home/doug/projects/cparse/deps/llvm/build/lib/liblibclang.so.3.0)
> ==30376==    by 0x5E3BD89: llvm::CrashRecoveryContext::RunSafely(void (*)(void*), void*) (in /home/doug/projects/cparse/deps/llvm/build/lib/liblibclang.so.3.0)
> ==30376==    by 0x5E3BE90: RunSafelyOnThread_Dispatch(void*) (in /home/doug/projects/cparse/deps/llvm/build/lib/liblibclang.so.3.0)
> ==30376==    by 0x5E72924: ExecuteOnThread_Dispatch(void*) (in /home/doug/projects/cparse/deps/llvm/build/lib/liblibclang.so.3.0)
> ==30376==    by 0x6D82970: start_thread (pthread_create.c:304)
> ==30376==    by 0x68DA92C: clone (clone.S:112)
> ==30376== 
> ==30376== LEAK SUMMARY:
> ==30376==    definitely lost: 1,056 bytes in 1 blocks
> 
> I'm a little lost as to if this is something I'm doing wrong on my code, or some kind of clang internal thing (seems internal, but I wouldnt have expected clang to leak memory, so I suspect perhaps I'm not cleaning up correctly after use?).
> 
> Any suggestions how to track this down?
> 
> My code is roughly like:
> 
> clang_createIndex(...);
> clang_createTranslationUnitFromSourceFile(...);
> clang_getTranslationUnitCursor(...);
> clang_visitChildren(...);
> clang_disposeTranslationUnit(...);
> clang_disposeIndex(...);
> 
> Is there some other shutdown I need to run?
> 
> ~
> Doug.
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