Revert r309328 and r309290 (which merged r309327 and r309226).

The header change caused problems; see PR34182, and PR33858 from #9 onwards, as
well as the discussion on the r309226 cfe-commits thread.

These changes don't seem to be addressing any regression from 4.0.0, so rather
than scrambling to fix this on the branch, let's revert to safety.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_50@311597 91177308-0d34-0410-b5e6-96231b3b80d8

Author: zmodem

lib/Headers/unwind.h

@@ -76,13 +76,7 @@ typedef intptr_t _sleb128_t;
 typedef uintptr_t _uleb128_t;
 
 struct _Unwind_Context;
-#if defined(__arm__) && !(defined(__USING_SJLJ_EXCEPTIONS__) || defined(__ARM_DWARF_EH___))
-struct _Unwind_Control_Block;
-typedef struct _Unwind_Control_Block _Unwind_Exception; /* Alias */
-#else
 struct _Unwind_Exception;
-typedef struct _Unwind_Exception _Unwind_Exception;
-#endif
 typedef enum {
   _URC_NO_REASON = 0,
 #if defined(__arm__) && !defined(__USING_SJLJ_EXCEPTIONS__) && \
@@ -115,42 +109,8 @@ typedef enum {
 } _Unwind_Action;
 
 typedef void (*_Unwind_Exception_Cleanup_Fn)(_Unwind_Reason_Code,
-                                             _Unwind_Exception *);
-
-#if defined(__arm__) && !(defined(__USING_SJLJ_EXCEPTIONS__) || defined(__ARM_DWARF_EH___))
-typedef struct _Unwind_Control_Block _Unwind_Control_Block;
-typedef uint32_t _Unwind_EHT_Header;
-
-struct _Unwind_Control_Block {
-  uint64_t exception_class;
-  void (*exception_cleanup)(_Unwind_Reason_Code, _Unwind_Control_Block *);
-  /* unwinder cache (private fields for the unwinder's use) */
-  struct {
-    uint32_t reserved1; /* forced unwind stop function, 0 if not forced */
-    uint32_t reserved2; /* personality routine */
-    uint32_t reserved3; /* callsite */
-    uint32_t reserved4; /* forced unwind stop argument */
-    uint32_t reserved5;
-  } unwinder_cache;
-  /* propagation barrier cache (valid after phase 1) */
-  struct {
-    uint32_t sp;
-    uint32_t bitpattern[5];
-  } barrier_cache;
-  /* cleanup cache (preserved over cleanup) */
-  struct {
-    uint32_t bitpattern[4];
-  } cleanup_cache;
-  /* personality cache (for personality's benefit) */
-  struct {
-    uint32_t fnstart;         /* function start address */
-    _Unwind_EHT_Header *ehtp; /* pointer to EHT entry header word */
-    uint32_t additional;      /* additional data */
-    uint32_t reserved1;
-  } pr_cache;
-  long long int : 0; /* force alignment of next item to 8-byte boundary */
-};
-#else
+                                             struct _Unwind_Exception *);
+
 struct _Unwind_Exception {
   _Unwind_Exception_Class exception_class;
   _Unwind_Exception_Cleanup_Fn exception_cleanup;
@@ -160,24 +120,23 @@ struct _Unwind_Exception {
    * aligned".  GCC has interpreted this to mean "use the maximum useful
    * alignment for the target"; so do we. */
 } __attribute__((__aligned__));
-#endif
 
 typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)(int, _Unwind_Action,
                                                _Unwind_Exception_Class,
-                                               _Unwind_Exception *,
+                                               struct _Unwind_Exception *,
                                                struct _Unwind_Context *,
                                                void *);
 
-typedef _Unwind_Reason_Code (*_Unwind_Personality_Fn)(int, _Unwind_Action,
-                                                      _Unwind_Exception_Class,
-                                                      _Unwind_Exception *,
-                                                      struct _Unwind_Context *);
+typedef _Unwind_Reason_Code (*_Unwind_Personality_Fn)(
+    int, _Unwind_Action, _Unwind_Exception_Class, struct _Unwind_Exception *,
+    struct _Unwind_Context *);
 typedef _Unwind_Personality_Fn __personality_routine;
 
 typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn)(struct _Unwind_Context *,
                                                 void *);
 
-#if defined(__arm__) && !(defined(__USING_SJLJ_EXCEPTIONS__) || defined(__ARM_DWARF_EH___))
+#if defined(__arm__) && !defined(__APPLE__)
+
 typedef enum {
   _UVRSC_CORE = 0,        /* integer register */
   _UVRSC_VFP = 1,         /* vfp */
@@ -199,12 +158,14 @@ typedef enum {
   _UVRSR_FAILED = 2
 } _Unwind_VRS_Result;
 
+#if !defined(__USING_SJLJ_EXCEPTIONS__) && !defined(__ARM_DWARF_EH__)
 typedef uint32_t _Unwind_State;
 #define _US_VIRTUAL_UNWIND_FRAME  ((_Unwind_State)0)
 #define _US_UNWIND_FRAME_STARTING ((_Unwind_State)1)
 #define _US_UNWIND_FRAME_RESUME   ((_Unwind_State)2)
 #define _US_ACTION_MASK           ((_Unwind_State)3)
 #define _US_FORCE_UNWIND          ((_Unwind_State)8)
+#endif
 
 _Unwind_VRS_Result _Unwind_VRS_Get(struct _Unwind_Context *__context,
   _Unwind_VRS_RegClass __regclass,
@@ -263,12 +224,13 @@ _Unwind_Ptr _Unwind_GetRegionStart(struct _Unwind_Context *);
 
 /* DWARF EH functions; currently not available on Darwin/ARM */
 #if !defined(__APPLE__) || !defined(__arm__)
-_Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Exception *);
-_Unwind_Reason_Code _Unwind_ForcedUnwind(_Unwind_Exception *, _Unwind_Stop_Fn,
-                                         void *);
-void _Unwind_DeleteException(_Unwind_Exception *);
-void _Unwind_Resume(_Unwind_Exception *);
-_Unwind_Reason_Code _Unwind_Resume_or_Rethrow(_Unwind_Exception *);
+
+_Unwind_Reason_Code _Unwind_RaiseException(struct _Unwind_Exception *);
+_Unwind_Reason_Code _Unwind_ForcedUnwind(struct _Unwind_Exception *,
+                                         _Unwind_Stop_Fn, void *);
+void _Unwind_DeleteException(struct _Unwind_Exception *);
+void _Unwind_Resume(struct _Unwind_Exception *);
+_Unwind_Reason_Code _Unwind_Resume_or_Rethrow(struct _Unwind_Exception *);
 
 #endif
 
@@ -279,11 +241,11 @@ typedef struct SjLj_Function_Context *_Unwind_FunctionContext_t;
 
 void _Unwind_SjLj_Register(_Unwind_FunctionContext_t);
 void _Unwind_SjLj_Unregister(_Unwind_FunctionContext_t);
-_Unwind_Reason_Code _Unwind_SjLj_RaiseException(_Unwind_Exception *);
-_Unwind_Reason_Code _Unwind_SjLj_ForcedUnwind(_Unwind_Exception *,
+_Unwind_Reason_Code _Unwind_SjLj_RaiseException(struct _Unwind_Exception *);
+_Unwind_Reason_Code _Unwind_SjLj_ForcedUnwind(struct _Unwind_Exception *,
                                               _Unwind_Stop_Fn, void *);
-void _Unwind_SjLj_Resume(_Unwind_Exception *);
-_Unwind_Reason_Code _Unwind_SjLj_Resume_or_Rethrow(_Unwind_Exception *);
+void _Unwind_SjLj_Resume(struct _Unwind_Exception *);
+_Unwind_Reason_Code _Unwind_SjLj_Resume_or_Rethrow(struct _Unwind_Exception *);
 
 void *_Unwind_FindEnclosingFunction(void *);