forked from OSchip/llvm-project
881aba7071
Currently, findUnwindSectionsByPhdr is slightly micro-optimized for the case where the first callback has the target address, and is otherwise very inefficient -- it decodes .eh_frame_hdr even when no PT_LOAD matches the PC. (If the FrameHeaderCache is enabled, then the micro-optimization only helps the first time unwind info is looked up.) Instead, it makes more sense to optimize for the case where the callback *doesn't* find the target address, so search for a PT_LOAD segment first, and only look for the unwind info section if a matching PT_LOAD is found. This change helps on an Android benchmark with 100 shared objects, where the DSO at the end of the dl_iterate_phdr list throws 10000 exceptions. Assuming the frame cache is disabled, this change cuts about 30-40% off the benchmark's runtime. Reviewed By: compnerd, saugustine, #libunwind Differential Revision: https://reviews.llvm.org/D87881 |
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