1 //===--------------------- cxa_exception_storage.cpp ----------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
9 // This file implements the storage for the "Caught Exception Stack"
10 // http://www.codesourcery.com/public/cxx-abi/abi-eh.html (section 2.2.2)
12 //===----------------------------------------------------------------------===//
14 #include "cxa_exception.hpp"
16 #ifdef HAS_THREAD_LOCAL
18 namespace __cxxabiv1 {
21 __cxa_eh_globals * __globals () {
22 static thread_local __cxa_eh_globals eh_globals;
28 __cxa_eh_globals * __cxa_get_globals () { return __globals (); }
29 __cxa_eh_globals * __cxa_get_globals_fast () { return __globals (); }
36 #include <cstdlib> // for calloc, free
37 #include "abort_message.h"
39 // In general, we treat all pthread errors as fatal.
40 // We cannot call std::terminate() because that will in turn
41 // call __cxa_get_globals() and cause infinite recursion.
43 namespace __cxxabiv1 {
46 pthread_once_t flag_ = PTHREAD_ONCE_INIT;
48 void destruct_ (void *p) {
50 if ( 0 != ::pthread_setspecific ( key_, NULL ) )
51 abort_message("cannot zero out thread value for __cxa_get_globals()");
55 if ( 0 != pthread_key_create ( &key_, destruct_ ) )
56 abort_message("cannot create pthread key for __cxa_get_globals()");
61 __cxa_eh_globals * __cxa_get_globals () {
62 // Try to get the globals for this thread
63 __cxa_eh_globals* retVal = __cxa_get_globals_fast ();
65 // If this is the first time we've been asked for these globals, create them
66 if ( NULL == retVal ) {
67 retVal = static_cast<__cxa_eh_globals*>
68 (std::calloc (1, sizeof (__cxa_eh_globals)));
70 abort_message("cannot allocate __cxa_eh_globals");
71 if ( 0 != pthread_setspecific ( key_, retVal ) )
72 abort_message("pthread_setspecific failure in __cxa_get_globals()");
77 // Note that this implementation will reliably return NULL if not
78 // preceded by a call to __cxa_get_globals(). This is an extension
79 // to the Itanium ABI and is taken advantage of in several places in
81 __cxa_eh_globals * __cxa_get_globals_fast () {
82 // First time through, create the key.
83 if (0 != pthread_once(&flag_, construct_))
84 abort_message("pthread_once failure in __cxa_get_globals_fast()");
85 // static int init = construct_();
86 return static_cast<__cxa_eh_globals*>(::pthread_getspecific(key_));