builtins: avoid duplicating unwind declarations

Use unwind.h to get the declarations for unwinding interfaces.  This header is
already provided by clang and gcc, so this adds no additional dependencies for
building the builtins library.  It avoids the duplication which may drift over
time though.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@225990 91177308-0d34-0410-b5e6-96231b3b80d8

Author: compnerd

CMakeLists.txt

@@ -203,6 +203,9 @@ pythonize_bool(COMPILER_RT_DEBUG)
 #================================
 # Setup Compiler Flags
 #================================
+include(CheckIncludeFile)
+check_include_file(unwind.h HAVE_UNWIND_H)
+
 include(config-ix)
 
 if(MSVC)

lib/builtins/CMakeLists.txt

@@ -79,7 +79,6 @@ set(GENERIC_SOURCES
   floatuntidf.c
   floatuntisf.c
   floatuntixf.c
-  gcc_personality_v0.c
   int_util.c
   lshrdi3.c
   lshrti3.c
@@ -137,6 +136,12 @@ set(GENERIC_SOURCES
   umodsi3.c
   umodti3.c)
 
+if (HAVE_UNWIND_H)
+  set(GENERIC_SOURCES
+      ${GENERIC_SOURCES}
+      gcc_personality_v0.c)
+endif ()
+
 set(x86_64_SOURCES
   x86_64/floatdidf.c
   x86_64/floatdisf.c

lib/builtins/gcc_personality_v0.c

@@ -11,47 +11,7 @@
 
 #include "int_lib.h"
 
-/*
- * _Unwind_* stuff based on C++ ABI public documentation
- * http://refspecs.freestandards.org/abi-eh-1.21.html
- */
-
-typedef enum {
-    _URC_NO_REASON = 0,
-    _URC_FOREIGN_EXCEPTION_CAUGHT = 1,
-    _URC_FATAL_PHASE2_ERROR = 2,
-    _URC_FATAL_PHASE1_ERROR = 3,
-    _URC_NORMAL_STOP = 4,
-    _URC_END_OF_STACK = 5,
-    _URC_HANDLER_FOUND = 6,
-    _URC_INSTALL_CONTEXT = 7,
-    _URC_CONTINUE_UNWIND = 8
-} _Unwind_Reason_Code;
-
-typedef enum {
-    _UA_SEARCH_PHASE = 1,
-    _UA_CLEANUP_PHASE = 2,
-    _UA_HANDLER_FRAME = 4,
-    _UA_FORCE_UNWIND = 8,
-    _UA_END_OF_STACK = 16
-} _Unwind_Action;
-
-typedef struct _Unwind_Context* _Unwind_Context_t;
-
-struct _Unwind_Exception {
-    uint64_t                exception_class;
-    void                    (*exception_cleanup)(_Unwind_Reason_Code reason, 
-                                                 struct _Unwind_Exception* exc);
-    uintptr_t                private_1;    
-    uintptr_t                private_2;    
-};
-
-COMPILER_RT_ABI  const uint8_t*    _Unwind_GetLanguageSpecificData(_Unwind_Context_t c);
-COMPILER_RT_ABI  void              _Unwind_SetGR(_Unwind_Context_t c, int i, uintptr_t n);
-COMPILER_RT_ABI  void              _Unwind_SetIP(_Unwind_Context_t, uintptr_t new_value);
-COMPILER_RT_ABI  uintptr_t         _Unwind_GetIP(_Unwind_Context_t context);
-COMPILER_RT_ABI  uintptr_t         _Unwind_GetRegionStart(_Unwind_Context_t context);
-
+#include <unwind.h>
 
 /*
  * Pointer encodings documented at:
@@ -185,12 +145,12 @@ static uintptr_t readEncodedPointer(const uint8_t** data, uint8_t encoding)
 COMPILER_RT_ABI _Unwind_Reason_Code
 __gcc_personality_sj0(int version, _Unwind_Action actions,
          uint64_t exceptionClass, struct _Unwind_Exception* exceptionObject,
-         _Unwind_Context_t context)
+         struct _Unwind_Context *context)
 #else
 COMPILER_RT_ABI _Unwind_Reason_Code
 __gcc_personality_v0(int version, _Unwind_Action actions,
          uint64_t exceptionClass, struct _Unwind_Exception* exceptionObject,
-         _Unwind_Context_t context)
+         struct _Unwind_Context *context)
 #endif
 {
     /* Since C does not have catch clauses, there is nothing to do during */