Extend the IL for selecting TLS models (PR9788)
This allows the user/front-end to specify a model that is better
than what LLVM would choose by default. For example, a variable
might be declared as
@x = thread_local(initialexec) global i32 42
if it will not be used in a shared library that is dlopen'ed.
If the specified model isn't supported by the target, or if LLVM can
make a better choice, a different model may be used.
llvm-svn: 159077
diff --git a/llvm/lib/VMCore/AsmWriter.cpp b/llvm/lib/VMCore/AsmWriter.cpp
index 4a7fde1..9147b63 100644
--- a/llvm/lib/VMCore/AsmWriter.cpp
+++ b/llvm/lib/VMCore/AsmWriter.cpp
@@ -1376,6 +1376,26 @@
}
}
+static void PrintThreadLocalModel(GlobalVariable::ThreadLocalMode TLM,
+ formatted_raw_ostream &Out) {
+ switch (TLM) {
+ case GlobalVariable::NotThreadLocal:
+ break;
+ case GlobalVariable::GeneralDynamicTLSModel:
+ Out << "thread_local ";
+ break;
+ case GlobalVariable::LocalDynamicTLSModel:
+ Out << "thread_local(localdynamic) ";
+ break;
+ case GlobalVariable::InitialExecTLSModel:
+ Out << "thread_local(initialexec) ";
+ break;
+ case GlobalVariable::LocalExecTLSModel:
+ Out << "thread_local(localexec) ";
+ break;
+ }
+}
+
void AssemblyWriter::printGlobal(const GlobalVariable *GV) {
if (GV->isMaterializable())
Out << "; Materializable\n";
@@ -1388,8 +1408,8 @@
PrintLinkage(GV->getLinkage(), Out);
PrintVisibility(GV->getVisibility(), Out);
+ PrintThreadLocalModel(GV->getThreadLocalMode(), Out);
- if (GV->isThreadLocal()) Out << "thread_local ";
if (unsigned AddressSpace = GV->getType()->getAddressSpace())
Out << "addrspace(" << AddressSpace << ") ";
if (GV->hasUnnamedAddr()) Out << "unnamed_addr ";