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

third_party/libc++abi/src/cxa_exception.hpp

Index: third_party/libc++abi/src/cxa_exception.hpp
===================================================================
--- third_party/libc++abi/src/cxa_exception.hpp	(revision 0)
+++ third_party/libc++abi/src/cxa_exception.hpp	(revision 0)
@@ -0,0 +1,123 @@
+//===------------------------- cxa_exception.hpp --------------------------===//
+//
+//                     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.
+//
+//  
+//  This file implements the "Exception Handling APIs"
+//  http://www.codesourcery.com/public/cxx-abi/abi-eh.html
+//  
+//===----------------------------------------------------------------------===//
+
+#ifndef _CXA_EXCEPTION_H
+#define _CXA_EXCEPTION_H
+
+#include <exception> // for std::unexpected_handler and std::terminate_handler
+#include <cxxabi.h>
+#include "unwind.h"
+
+namespace __cxxabiv1 {
+
+#pragma GCC visibility push(hidden)
+
+static const uint64_t kOurExceptionClass          = 0x434C4E47432B2B00; // CLNGC++\0
+static const uint64_t kOurDependentExceptionClass = 0x434C4E47432B2B01; // CLNGC++\1
+static const uint64_t get_vendor_and_language =     0xFFFFFFFFFFFFFF00; // mask for CLNGC++
+                                                    
+    struct __cxa_exception { 
+#if __LP64__
+    // This is a new field to support C++ 0x exception_ptr.
+    // For binary compatibility it is at the start of this
+    // struct which is prepended to the object thrown in
+    // __cxa_allocate_exception.
+        size_t referenceCount;
+#endif
+    
+    //  Manage the exception object itself.
+        std::type_info *exceptionType;
+        void (*exceptionDestructor)(void *); 
+        std::unexpected_handler unexpectedHandler;
+        std::terminate_handler  terminateHandler;
+        
+         __cxa_exception *nextException;
+        
+         int handlerCount;
+    
+#ifdef __ARM_EABI_UNWINDER__
+         __cxa_exception* nextPropagatingException;
+         int propagationCount;
+#else
+         int handlerSwitchValue;
+         const unsigned char *actionRecord;
+         const unsigned char *languageSpecificData;
+         void *catchTemp;
+         void *adjustedPtr;
+#endif
+
+#if !__LP64__
+    // This is a new field to support C++ 0x exception_ptr.
+    // For binary compatibility it is placed where the compiler
+    // previously adding padded to 64-bit align unwindHeader.
+        size_t referenceCount;
+#endif
+    
+        _Unwind_Exception unwindHeader;
+        };
+
+// http://sourcery.mentor.com/archives/cxx-abi-dev/msg01924.html
+    
+    struct __cxa_dependent_exception {
+#if __LP64__
+        void* primaryException;
+#endif
+    
+        std::type_info *exceptionType;
+        void (*exceptionDestructor)(void *); 
+        std::unexpected_handler unexpectedHandler;
+        std::terminate_handler terminateHandler;
+    
+        __cxa_exception *nextException;
+    
+        int handlerCount;
+    
+#ifdef __ARM_EABI_UNWINDER__
+        __cxa_exception* nextPropagatingException;
+        int propagationCount;
+#else
+        int handlerSwitchValue;
+        const unsigned char *actionRecord;
+        const unsigned char *languageSpecificData;
+        void * catchTemp;
+        void *adjustedPtr;
+#endif
+    
+#if !__LP64__
+        void* primaryException;
+#endif
+    
+        _Unwind_Exception unwindHeader;
+        };
+        
+    struct __cxa_eh_globals {
+        __cxa_exception *   caughtExceptions;
+        unsigned int        uncaughtExceptions;
+#ifdef __ARM_EABI_UNWINDER__
+        __cxa_exception* propagatingExceptions;
+#endif
+    };
+
+#pragma GCC visibility pop
+#pragma GCC visibility push(default)
+
+    extern "C" __cxa_eh_globals * __cxa_get_globals      ();
+    extern "C" __cxa_eh_globals * __cxa_get_globals_fast ();
+
+    extern "C" void * __cxa_allocate_dependent_exception ();
+    extern "C" void __cxa_free_dependent_exception (void * dependent_exception);
+
+#pragma GCC visibility pop
+}
+
+#endif  // _CXA_EXCEPTION_H