From 4c94b3eff7c212e431a117c6c10ee60bb2a8e875 Mon Sep 17 00:00:00 2001
From: Tiago Rodrigues <trodrigues@nvidia.com>
Date: Fri, 10 Nov 2023 17:00:39 -0500
Subject: [PATCH] Add support to use libunwind for backtrace capturing on linux
 platforms (which is ~ 4x faster than execinfo)

---
 public/client/TracyCallstack.hpp | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/public/client/TracyCallstack.hpp b/public/client/TracyCallstack.hpp
index 0b522b73..36e295a1 100644
--- a/public/client/TracyCallstack.hpp
+++ b/public/client/TracyCallstack.hpp
@@ -8,9 +8,15 @@
 #if TRACY_HAS_CALLSTACK == 2 || TRACY_HAS_CALLSTACK == 5
 #  include <unwind.h>
 #elif TRACY_HAS_CALLSTACK >= 3
-#  include <execinfo.h>
-#endif
+ #ifdef USE_LIB_UNWIND_BACKTRACE
+    // libunwind is in general significantly faster than execinfo based backtraces
+    #define UNW_LOCAL_ONLY
+    #  include <libunwind.h>
+ #else
+    #  include <execinfo.h>
+ #endif
 
+#endif
 
 #ifndef TRACY_HAS_CALLSTACK
 
@@ -127,7 +133,13 @@ static tracy_force_inline void* Callstack( int depth )
     assert( depth >= 1 );
 
     auto trace = (uintptr_t*)tracy_malloc( ( 1 + (size_t)depth ) * sizeof( uintptr_t ) );
+
+#ifdef USE_LIB_UNWIND_BACKTRACE
+    size_t num =  unw_backtrace( (void**)(trace+1), depth );
+#else
     const auto num = (size_t)backtrace( (void**)(trace+1), depth );
+#endif
+
     *trace = num;
 
     return trace;