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Satisfy C++ aliasing rules, per suggestion by Chandler.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158346 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Argyrios Kyrtzidis 2012-06-12 01:06:16 +00:00
parent 138c2b4e8a
commit 3e61374295
3 changed files with 8 additions and 3 deletions
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7
include/llvm/Support/ThreadLocal.h
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@ -28,7 +28,12 @@ namespace llvm {
/// ///
/// This is embedded in the class and we avoid malloc'ing/free'ing it, /// This is embedded in the class and we avoid malloc'ing/free'ing it,
/// to make this class more safe for use along with CrashRecoveryContext. /// to make this class more safe for use along with CrashRecoveryContext.
ThreadLocalDataTy data; union {
char data[sizeof(ThreadLocalDataTy)];
struct {
ThreadLocalDataTy align_data;
};
};
public: public:
ThreadLocalImpl(); ThreadLocalImpl();
virtual ~ThreadLocalImpl(); virtual ~ThreadLocalImpl();

2
lib/Support/ThreadLocal.cpp
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@ -40,7 +40,7 @@ void ThreadLocalImpl::removeInstance() { data = 0; }
namespace llvm { namespace llvm {
using namespace sys; using namespace sys;
ThreadLocalImpl::ThreadLocalImpl() : data(0) { ThreadLocalImpl::ThreadLocalImpl() : data() {
typedef int SIZE_TOO_BIG[sizeof(pthread_key_t) <= sizeof(data) ? 1 : -1]; typedef int SIZE_TOO_BIG[sizeof(pthread_key_t) <= sizeof(data) ? 1 : -1];
pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data); pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
int errorcode = pthread_key_create(key, NULL); int errorcode = pthread_key_create(key, NULL);

2
lib/Support/Windows/ThreadLocal.inc
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@ -22,7 +22,7 @@
namespace llvm { namespace llvm {
using namespace sys; using namespace sys;
ThreadLocalImpl::ThreadLocalImpl() : data(0) { ThreadLocalImpl::ThreadLocalImpl() : data() {
typedef int SIZE_TOO_BIG[sizeof(DWORD) <= sizeof(data) ? 1 : -1]; typedef int SIZE_TOO_BIG[sizeof(DWORD) <= sizeof(data) ? 1 : -1];
DWORD* tls = reinterpret_cast<DWORD*>(&data); DWORD* tls = reinterpret_cast<DWORD*>(&data);
*tls = TlsAlloc(); *tls = TlsAlloc();