forked from OSchip/llvm-project
38c356176b
Summary: This patch fixes two problems with the crtbegin.c as written: 1. In do_init, register_frame_info is not guarded by a #define, but in do_fini, deregister_frame_info is guarded by #ifndef CRT_HAS_INITFINI_ARRAY. Thus when CRT_HAS_INITFINI_ARRAY is not defined, frames are registered but then never deregistered. The frame registry mechanism builds a linked-list from the .so's static variable do_init.object, and when the .so is unloaded, this memory becomes invalid and should be deregistered. Further, libgcc's crtbegin treats the frame registry as independent from the initfini array mechanism. This patch fixes this by adding a new #define, "EH_USE_FRAME_INFO_REGISTRY", which is set by the cmake option COMPILER_RT_CRT_USE_EH_FRAME_REGISTRY Currently, do_init calls register_frame_info, and then calls the binary's constructors. This allows constructors to safely use libunwind. However, do_fini calls deregister_frame_info and then calls the binary's destructors. This prevents destructors from safely using libunwind. This patch also switches that ordering, so that destructors can safely use libunwind. As it happens, this is a fairly common scenario for thread sanitizer. |
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| .. | ||
| CMakeLists.txt | ||
| ctor_dtor.c | ||
| dso_handle.cpp | ||
| lit.cfg.py | ||
| lit.site.cfg.py.in | ||