Use LLVM libunwind for stack unwinding on Unix

This change replaces external libunwind usage on Unix by a copy of the LLVM libunwind.
It also modifies libunwind to support reporting register location and implements
the unw_get_save_loc API to get this location.
For now, only memory locations are supported (register locations are not).

1 files changed, 26 insertions, 1 deletions

diff --git a/src/Native/Runtime/CMakeLists.txt b/src/Native/Runtime/CMakeLists.txt
index fe2786573..59afa5b37 100644
--- a/src/Native/Runtime/CMakeLists.txt
+++ b/src/Native/Runtime/CMakeLists.txt
@@ -73,6 +73,9 @@ if(WIN32)
   list(APPEND COMMON_RUNTIME_SOURCES
     windows/PalRedhawkCommon.cpp
     windows/PalRedhawkMinWin.cpp
+  )
+
+  list(APPEND FULL_RUNTIME_SOURCES 
     windows/CoffNativeCodeManager.cpp
   )
 
@@ -88,14 +91,32 @@ if(WIN32)
 else()
 
   include_directories(unix)
+  include_directories(../libunwind/include)
+
+  # Disable building _Unwind_XXX style APIs of libunwind, since we don't use them.
+  add_definitions(-D_LIBUNWIND_DISABLE_ZERO_COST_APIS=1)
+
+  # Compile unwinding only for the current compilation target architecture
+  add_definitions(-D_LIBUNWIND_IS_NATIVE_ONLY)
 
   list(APPEND COMMON_RUNTIME_SOURCES
-    unix/HardwareExceptions.cpp
     unix/PalRedhawkUnix.cpp
+  )
+
+  list(APPEND FULL_RUNTIME_SOURCES
+    unix/HardwareExceptions.cpp
     unix/UnixContext.cpp
     unix/UnixNativeCodeManager.cpp
+    ../libunwind/src/Unwind-EHABI.cpp
+    ../libunwind/src/libunwind.cpp
   )
 
+  if(CLR_CMAKE_PLATFORM_DARWIN)
+    list(APPEND FULL_RUNTIME_SOURCES
+      ../libunwind/src/Unwind_AppleExtras.cpp
+    )
+  endif()
+
   if(CLR_CMAKE_PLATFORM_ARCH_AMD64)
     set(ARCH_SOURCES_DIR amd64)
     set(ASM_SUFFIX S)
@@ -107,6 +128,10 @@ else()
     set(ASM_SUFFIX S)
   endif()
 
+  list(APPEND RUNTIME_SOURCES_ARCH_ASM
+    ../libunwind/src/UnwindRegistersRestore.S
+    ../libunwind/src/UnwindRegistersSave.S
+  )
 endif()
 
 list(APPEND RUNTIME_SOURCES_ARCH_ASM