0024-libunwind-Added-unw_backtrace-method.patch 2.1 KB

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  1. From 959667047a6d92e3912762c8db5695a945c564b4 Mon Sep 17 00:00:00 2001
  2. From: Maksim Kita <maksim-kita@yandex-team.ru>
  3. Date: Sun, 23 May 2021 10:27:29 +0000
  4. Subject: [PATCH] libunwind: Added unw_backtrace method
  5. Source: https://github.com/ClickHouse-Extras/libunwind/commit/52f0f7861926cbfaef7e6c97d8a6d7ba2a1f6747#diff-a82fc885e2e4facf4b92d26171c13aa4aa5db296f77e1158ba2f8664e3bd1f5c
  6. Upstream-Status: Pending
  7. Signed-off-by: Khem Raj <raj.khem@gmail.com>
  8. ---
  9. libunwind/include/libunwind.h | 1 +
  10. libunwind/src/libunwind.cpp | 18 ++++++++++++++++++
  11. 2 files changed, 19 insertions(+)
  12. diff --git a/libunwind/include/libunwind.h b/libunwind/include/libunwind.h
  13. index d2ad5ab87122..d735d955aee2 100644
  14. --- a/libunwind/include/libunwind.h
  15. +++ b/libunwind/include/libunwind.h
  16. @@ -130,6 +130,7 @@ extern int unw_is_fpreg(unw_cursor_t *, unw_regnum_t) LIBUNWIND_AVAIL;
  17. extern int unw_is_signal_frame(unw_cursor_t *) LIBUNWIND_AVAIL;
  18. extern int unw_get_proc_name(unw_cursor_t *, char *, size_t, unw_word_t *) LIBUNWIND_AVAIL;
  19. //extern int unw_get_save_loc(unw_cursor_t*, int, unw_save_loc_t*);
  20. +extern int unw_backtrace(void **, int) LIBUNWIND_AVAIL;
  21. extern unw_addr_space_t unw_local_addr_space;
  22. diff --git a/libunwind/src/libunwind.cpp b/libunwind/src/libunwind.cpp
  23. index 0faea2b78570..14bf07d8f470 100644
  24. --- a/libunwind/src/libunwind.cpp
  25. +++ b/libunwind/src/libunwind.cpp
  26. @@ -349,7 +349,25 @@ void __unw_remove_dynamic_eh_frame_section(unw_word_t eh_frame_start) {
  27. #endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
  28. #endif // !defined(__USING_SJLJ_EXCEPTIONS__)
  29. +int unw_backtrace(void **buffer, int size) {
  30. + unw_context_t context;
  31. + unw_cursor_t cursor;
  32. + if (unw_getcontext(&context) || unw_init_local(&cursor, &context)) {
  33. + return 0;
  34. + }
  35. +
  36. + unw_word_t ip;
  37. + int current = 0;
  38. + while (unw_step(&cursor) > 0) {
  39. + if (current >= size || unw_get_reg(&cursor, UNW_REG_IP, &ip)) {
  40. + break;
  41. + }
  42. + buffer[current++] = reinterpret_cast<void *>(static_cast<uintptr_t>(ip));
  43. + }
  44. +
  45. + return current;
  46. +}
  47. // Add logging hooks in Debug builds only
  48. #ifndef NDEBUG