Author: hhinnant
Date: Wed Jan 25 13:19:13 2012
New Revision: 148966
URL: http://llvm.org/viewvc/llvm-project?rev=148966&view=rev
Log:
Add comment documenting extension behavior of __cxa_get_globals_fast().
Modified:
libcxxabi/trunk/src/cxa_exception_storage.cpp
Modified: libcxxabi/trunk/src/cxa_exception_storage.cpp
URL:
http://llvm.org/viewvc/llvm-project/libcxxabi/trunk/src/cxa_exception_storage.cpp?rev=148966&r1=148965&r2=148966&view=diff
==============================================================================
--- libcxxabi/trunk/src/cxa_exception_storage.cpp (original)
+++ libcxxabi/trunk/src/cxa_exception_storage.cpp Wed Jan 25 13:19:13 2012
@@ -75,6 +75,10 @@
return retVal;
}
+ // Note that this implementation will reliably return NULL if not
+ // preceeded by a call to __cxa_get_globals(). This is an extension
+ // to the Itanium ABI and is taken advantage of in several places in
+ // libc++abi.
__cxa_eh_globals * __cxa_get_globals_fast () noexcept {
// First time through, create the key.
static int init = construct_();
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