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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159077 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AsmParser/LLParser.cpp b/lib/AsmParser/LLParser.cpp
index fe41561..095b7c5 100644
--- a/lib/AsmParser/LLParser.cpp
+++ b/lib/AsmParser/LLParser.cpp
@@ -645,12 +645,13 @@
unsigned Linkage, bool HasLinkage,
unsigned Visibility) {
unsigned AddrSpace;
- bool ThreadLocal, IsConstant, UnnamedAddr;
+ bool IsConstant, UnnamedAddr;
+ GlobalVariable::ThreadLocalMode TLM;
LocTy UnnamedAddrLoc;
LocTy TyLoc;
Type *Ty = 0;
- if (ParseOptionalToken(lltok::kw_thread_local, ThreadLocal) ||
+ if (ParseOptionalThreadLocal(TLM) ||
ParseOptionalAddrSpace(AddrSpace) ||
ParseOptionalToken(lltok::kw_unnamed_addr, UnnamedAddr,
&UnnamedAddrLoc) ||
@@ -691,7 +692,8 @@
if (GV == 0) {
GV = new GlobalVariable(*M, Ty, false, GlobalValue::ExternalLinkage, 0,
- Name, 0, false, AddrSpace);
+ Name, 0, GlobalVariable::NotThreadLocal,
+ AddrSpace);
} else {
if (GV->getType()->getElementType() != Ty)
return Error(TyLoc,
@@ -710,7 +712,7 @@
GV->setConstant(IsConstant);
GV->setLinkage((GlobalValue::LinkageTypes)Linkage);
GV->setVisibility((GlobalValue::VisibilityTypes)Visibility);
- GV->setThreadLocal(ThreadLocal);
+ GV->setThreadLocalMode(TLM);
GV->setUnnamedAddr(UnnamedAddr);
// Parse attributes on the global.
@@ -858,6 +860,46 @@
return false;
}
+/// ParseTLSModel
+/// := 'localdynamic'
+/// := 'initialexec'
+/// := 'localexec'
+bool LLParser::ParseTLSModel(GlobalVariable::ThreadLocalMode &TLM) {
+ switch (Lex.getKind()) {
+ default:
+ return TokError("expected localdynamic, initialexec or localexec");
+ case lltok::kw_localdynamic:
+ TLM = GlobalVariable::LocalDynamicTLSModel;
+ break;
+ case lltok::kw_initialexec:
+ TLM = GlobalVariable::InitialExecTLSModel;
+ break;
+ case lltok::kw_localexec:
+ TLM = GlobalVariable::LocalExecTLSModel;
+ break;
+ }
+
+ Lex.Lex();
+ return false;
+}
+
+/// ParseOptionalThreadLocal
+/// := /*empty*/
+/// := 'thread_local'
+/// := 'thread_local' '(' tlsmodel ')'
+bool LLParser::ParseOptionalThreadLocal(GlobalVariable::ThreadLocalMode &TLM) {
+ TLM = GlobalVariable::NotThreadLocal;
+ if (!EatIfPresent(lltok::kw_thread_local))
+ return false;
+
+ TLM = GlobalVariable::GeneralDynamicTLSModel;
+ if (Lex.getKind() == lltok::lparen) {
+ Lex.Lex();
+ return ParseTLSModel(TLM) ||
+ ParseToken(lltok::rparen, "expected ')' after thread local model");
+ }
+ return false;
+}
/// ParseOptionalAddrSpace
/// := /*empty*/