Add libc++ and libc++abi to third-party.

third_party/libc++abi/src/Unwind/Unwind_AppleExtras.cpp

+//===--------------------- Unwind_AppleExtras.cpp -------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//
+//===----------------------------------------------------------------------===//
+
+#include "config.h"
+#include "DwarfParser.hpp"
+#include "unwind_ext.h"
+
+
+// private keymgr stuff
+#define KEYMGR_GCC3_DW2_OBJ_LIST 302
+extern "C" {
+ extern void _keymgr_set_and_unlock_processwide_ptr(int key, void *ptr);
+ extern void *_keymgr_get_and_lock_processwide_ptr(int key);
+}
+
+// undocumented libgcc "struct object"
+struct libgcc_object {
+  void          *start;
+  void          *unused1;
+  void          *unused2;
+  void          *fde;
+  unsigned long  encoding;
+  void          *fde_end;
+  libgcc_object *next;
+};
+
+// undocumented libgcc "struct km_object_info" referenced by
+// KEYMGR_GCC3_DW2_OBJ_LIST
+struct libgcc_object_info {
+  libgcc_object   *seen_objects;
+  libgcc_object   *unseen_objects;
+  unsigned         spare[2];
+};
+
+
+// static linker symbols to prevent wrong two level namespace for _Unwind symbols
+#if __arm__
+   #define NOT_HERE_BEFORE_5_0(sym)     \
+       extern const char sym##_tmp30 __asm("$ld$hide$os3.0$_" #sym ); \
+       __attribute__((visibility("default"))) const char sym##_tmp30 = 0; \
+       extern const char sym##_tmp31 __asm("$ld$hide$os3.1$_" #sym ); \
+          __attribute__((visibility("default"))) const char sym##_tmp31 = 0; \
+       extern const char sym##_tmp32 __asm("$ld$hide$os3.2$_" #sym );\
+           __attribute__((visibility("default"))) const char sym##_tmp32 = 0; \
+       extern const char sym##_tmp40 __asm("$ld$hide$os4.0$_" #sym ); \
+          __attribute__((visibility("default"))) const char sym##_tmp40 = 0; \
+       extern const char sym##_tmp41 __asm("$ld$hide$os4.1$_" #sym ); \
+          __attribute__((visibility("default"))) const char sym##_tmp41 = 0; \
+       extern const char sym##_tmp42 __asm("$ld$hide$os4.2$_" #sym ); \
+          __attribute__((visibility("default"))) const char sym##_tmp42 = 0; \
+       extern const char sym##_tmp43 __asm("$ld$hide$os4.3$_" #sym ); \
+          __attribute__((visibility("default"))) const char sym##_tmp43 = 0;
+#elif __arm64__
+  #define NOT_HERE_BEFORE_10_6(sym)
+  #define NEVER_HERE(sym)
+#else
+  #define NOT_HERE_BEFORE_10_6(sym) \
+    extern const char sym##_tmp4 __asm("$ld$hide$os10.4$_" #sym ); \
+          __attribute__((visibility("default"))) const char sym##_tmp4 = 0; \
+    extern const char sym##_tmp5 __asm("$ld$hide$os10.5$_" #sym ); \
+          __attribute__((visibility("default"))) const char sym##_tmp5 = 0;
+  #define NEVER_HERE(sym) \
+    extern const char sym##_tmp4 __asm("$ld$hide$os10.4$_" #sym ); \
+          __attribute__((visibility("default"))) const char sym##_tmp4 = 0; \
+    extern const char sym##_tmp5 __asm("$ld$hide$os10.5$_" #sym ); \
+          __attribute__((visibility("default"))) const char sym##_tmp5 = 0; \
+    extern const char sym##_tmp6 __asm("$ld$hide$os10.6$_" #sym ); \
+          __attribute__((visibility("default"))) const char sym##_tmp6 = 0;
+#endif
+
+
+#if _LIBUNWIND_BUILD_ZERO_COST_APIS
+
+//
+// symbols in libSystem.dylib in 10.6 and later, but are in libgcc_s.dylib in
+// earlier versions
+//
+NOT_HERE_BEFORE_10_6(_Unwind_DeleteException)
+NOT_HERE_BEFORE_10_6(_Unwind_Find_FDE)
+NOT_HERE_BEFORE_10_6(_Unwind_ForcedUnwind)
+NOT_HERE_BEFORE_10_6(_Unwind_GetGR)
+NOT_HERE_BEFORE_10_6(_Unwind_GetIP)
+NOT_HERE_BEFORE_10_6(_Unwind_GetLanguageSpecificData)
+NOT_HERE_BEFORE_10_6(_Unwind_GetRegionStart)
+NOT_HERE_BEFORE_10_6(_Unwind_RaiseException)
+NOT_HERE_BEFORE_10_6(_Unwind_Resume)
+NOT_HERE_BEFORE_10_6(_Unwind_SetGR)
+NOT_HERE_BEFORE_10_6(_Unwind_SetIP)
+NOT_HERE_BEFORE_10_6(_Unwind_Backtrace)
+NOT_HERE_BEFORE_10_6(_Unwind_FindEnclosingFunction)
+NOT_HERE_BEFORE_10_6(_Unwind_GetCFA)
+NOT_HERE_BEFORE_10_6(_Unwind_GetDataRelBase)
+NOT_HERE_BEFORE_10_6(_Unwind_GetTextRelBase)
+NOT_HERE_BEFORE_10_6(_Unwind_Resume_or_Rethrow)
+NOT_HERE_BEFORE_10_6(_Unwind_GetIPInfo)
+NOT_HERE_BEFORE_10_6(__register_frame)
+NOT_HERE_BEFORE_10_6(__deregister_frame)
+
+//
+// symbols in libSystem.dylib for compatibility, but we don't want any new code
+// using them
+//
+NEVER_HERE(__register_frame_info_bases)
+NEVER_HERE(__register_frame_info)
+NEVER_HERE(__register_frame_info_table_bases)
+NEVER_HERE(__register_frame_info_table)
+NEVER_HERE(__register_frame_table)
+NEVER_HERE(__deregister_frame_info)
+NEVER_HERE(__deregister_frame_info_bases)
+
+#endif // _LIBUNWIND_BUILD_ZERO_COST_APIS
+
+
+
+
+#if _LIBUNWIND_BUILD_SJLJ_APIS
+//
+// symbols in libSystem.dylib in iOS 5.0 and later, but are in libgcc_s.dylib in
+// earlier versions
+//
+NOT_HERE_BEFORE_5_0(_Unwind_GetLanguageSpecificData)
+NOT_HERE_BEFORE_5_0(_Unwind_GetRegionStart)
+NOT_HERE_BEFORE_5_0(_Unwind_GetIP)
+NOT_HERE_BEFORE_5_0(_Unwind_SetGR)
+NOT_HERE_BEFORE_5_0(_Unwind_SetIP)
+NOT_HERE_BEFORE_5_0(_Unwind_DeleteException)
+NOT_HERE_BEFORE_5_0(_Unwind_SjLj_Register)
+NOT_HERE_BEFORE_5_0(_Unwind_GetGR)
+NOT_HERE_BEFORE_5_0(_Unwind_GetIPInfo)
+NOT_HERE_BEFORE_5_0(_Unwind_GetCFA)
+NOT_HERE_BEFORE_5_0(_Unwind_SjLj_Resume)
+NOT_HERE_BEFORE_5_0(_Unwind_SjLj_RaiseException)
+NOT_HERE_BEFORE_5_0(_Unwind_SjLj_Resume_or_Rethrow)
+NOT_HERE_BEFORE_5_0(_Unwind_SjLj_Unregister)
+
+#endif // _LIBUNWIND_BUILD_SJLJ_APIS
+
+
+namespace libunwind {
+
+_LIBUNWIND_HIDDEN
+bool checkKeyMgrRegisteredFDEs(uintptr_t pc, void *&fde) {
+#if __MAC_OS_X_VERSION_MIN_REQUIRED
+  // lastly check for old style keymgr registration of dynamically generated
+  // FDEs acquire exclusive access to libgcc_object_info
+  libgcc_object_info *head = (libgcc_object_info *)
+                _keymgr_get_and_lock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST);
+  if (head != NULL) {
+    // look at each FDE in keymgr
+    for (libgcc_object *ob = head->unseen_objects; ob != NULL; ob = ob->next) {
+      CFI_Parser<LocalAddressSpace>::FDE_Info fdeInfo;
+      CFI_Parser<LocalAddressSpace>::CIE_Info cieInfo;
+      const char *msg = CFI_Parser<LocalAddressSpace>::decodeFDE(
+                                      LocalAddressSpace::sThisAddressSpace,
+                                      (uintptr_t)ob->fde, &fdeInfo, &cieInfo);
+      if (msg == NULL) {
+        // Check if this FDE is for a function that includes the pc
+        if ((fdeInfo.pcStart <= pc) && (pc < fdeInfo.pcEnd)) {
+          fde = (void*)fdeInfo.pcStart;
+          _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST,
+                                                 head);
+          return true;
+        }
+      }
+    }
+  }
+  // release libgcc_object_info
+  _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST, head);
+#else
+  (void)pc;
+  (void)fde;
+#endif
+  return false;
+}
+
+}
+
+
+#if !FOR_DYLD && _LIBUNWIND_BUILD_SJLJ_APIS
+
+#include <System/pthread_machdep.h>
+
+// Accessors to get get/set linked list of frames for sjlj based execeptions.
+_LIBUNWIND_HIDDEN
+struct _Unwind_FunctionContext *__Unwind_SjLj_GetTopOfFunctionStack() {
+  return (struct _Unwind_FunctionContext *)
+    _pthread_getspecific_direct(__PTK_LIBC_DYLD_Unwind_SjLj_Key);
+}
+
+_LIBUNWIND_HIDDEN
+void __Unwind_SjLj_SetTopOfFunctionStack(struct _Unwind_FunctionContext *fc) {
+  _pthread_setspecific_direct(__PTK_LIBC_DYLD_Unwind_SjLj_Key, fc);
+}
+#endif
+
+
+
+