[libc++] Replace __sync_* functions with __libcpp_atomic_* functions
Summary:
This patch replaces __sync_* with __libcpp_atomic_* and adds a wrapper
function for __atomic_exchange to support _LIBCPP_HAS_NO_THREADS.
Reviewers: EricWF, jroelofs, mclow.lists, compnerd
Reviewed By: EricWF, compnerd
Subscribers: compnerd, efriedma, cfe-commits, joerg, llvm-commits
Differential Revision: https://reviews.llvm.org/D35235
llvm-svn: 313694
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: fbfaec7089b8bfc1e3ef91dfbc50b4b7cf7a79e7
diff --git a/src/include/refstring.h b/src/include/refstring.h
index f0d5b44..702f2b7 100644
--- a/src/include/refstring.h
+++ b/src/include/refstring.h
@@ -18,6 +18,7 @@
#include <dlfcn.h>
#include <mach-o/dyld.h>
#endif
+#include "atomic_support.h"
_LIBCPP_BEGIN_NAMESPACE_STD
@@ -83,7 +84,7 @@
: __imp_(s.__imp_)
{
if (__uses_refcount())
- __sync_add_and_fetch(&rep_from_data(__imp_)->count, 1);
+ __libcpp_atomic_add(&rep_from_data(__imp_)->count, 1);
}
inline
@@ -92,10 +93,10 @@
struct _Rep_base *old_rep = rep_from_data(__imp_);
__imp_ = s.__imp_;
if (__uses_refcount())
- __sync_add_and_fetch(&rep_from_data(__imp_)->count, 1);
+ __libcpp_atomic_add(&rep_from_data(__imp_)->count, 1);
if (adjust_old_count)
{
- if (__sync_add_and_fetch(&old_rep->count, count_t(-1)) < 0)
+ if (__libcpp_atomic_add(&old_rep->count, count_t(-1)) < 0)
{
::operator delete(old_rep);
}
@@ -107,7 +108,7 @@
__libcpp_refstring::~__libcpp_refstring() {
if (__uses_refcount()) {
_Rep_base* rep = rep_from_data(__imp_);
- if (__sync_add_and_fetch(&rep->count, count_t(-1)) < 0) {
+ if (__libcpp_atomic_add(&rep->count, count_t(-1)) < 0) {
::operator delete(rep);
}
}