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From b75d3ed8f09ee013809a4321ff21b3bfb7e4a467 Mon Sep 17 00:00:00 2001
From: Maksim Kita <maksim-kita@yandex-team.ru>
Date: Sun, 23 May 2021 10:27:29 +0000
Subject: [PATCH] libunwind: Added unw_backtrace method
Source: https://github.com/ClickHouse-Extras/libunwind/commit/52f0f7861926cbfaef7e6c97d8a6d7ba2a1f6747#diff-a82fc885e2e4facf4b92d26171c13aa4aa5db296f77e1158ba2f8664e3bd1f5c
Upstream-Status: Pending
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
libunwind/include/libunwind.h | 1 +
libunwind/src/libunwind.cpp | 18 ++++++++++++++++++
2 files changed, 19 insertions(+)
diff --git a/libunwind/include/libunwind.h b/libunwind/include/libunwind.h
index d2ad5ab87122..d735d955aee2 100644
--- a/libunwind/include/libunwind.h
+++ b/libunwind/include/libunwind.h
@@ -130,6 +130,7 @@ extern int unw_is_fpreg(unw_cursor_t *, unw_regnum_t) LIBUNWIND_AVAIL;
extern int unw_is_signal_frame(unw_cursor_t *) LIBUNWIND_AVAIL;
extern int unw_get_proc_name(unw_cursor_t *, char *, size_t, unw_word_t *) LIBUNWIND_AVAIL;
//extern int unw_get_save_loc(unw_cursor_t*, int, unw_save_loc_t*);
+extern int unw_backtrace(void **, int) LIBUNWIND_AVAIL;
extern unw_addr_space_t unw_local_addr_space;
diff --git a/libunwind/src/libunwind.cpp b/libunwind/src/libunwind.cpp
index 0faea2b78570..14bf07d8f470 100644
--- a/libunwind/src/libunwind.cpp
+++ b/libunwind/src/libunwind.cpp
@@ -349,7 +349,25 @@ void __unw_remove_dynamic_eh_frame_section(unw_word_t eh_frame_start) {
#endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
#endif // !defined(__USING_SJLJ_EXCEPTIONS__)
+int unw_backtrace(void **buffer, int size) {
+ unw_context_t context;
+ unw_cursor_t cursor;
+ if (unw_getcontext(&context) || unw_init_local(&cursor, &context)) {
+ return 0;
+ }
+
+ unw_word_t ip;
+ int current = 0;
+ while (unw_step(&cursor) > 0) {
+ if (current >= size || unw_get_reg(&cursor, UNW_REG_IP, &ip)) {
+ break;
+ }
+ buffer[current++] = reinterpret_cast<void *>(static_cast<uintptr_t>(ip));
+ }
+
+ return current;
+}
// Add logging hooks in Debug builds only
#ifndef NDEBUG
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