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/Bitcode/Reader/BitcodeReader.cpp b/lib/Bitcode/Reader/BitcodeReader.cpp
index 83756da..4a20b1c 100644
--- a/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -102,6 +102,17 @@
}
}
+static GlobalVariable::ThreadLocalMode GetDecodedThreadLocalMode(unsigned Val) {
+ switch (Val) {
+ case 0: return GlobalVariable::NotThreadLocal;
+ default: // Map unknown non-zero value to general dynamic.
+ case 1: return GlobalVariable::GeneralDynamicTLSModel;
+ case 2: return GlobalVariable::LocalDynamicTLSModel;
+ case 3: return GlobalVariable::InitialExecTLSModel;
+ case 4: return GlobalVariable::LocalExecTLSModel;
+ }
+}
+
static int GetDecodedCastOpcode(unsigned Val) {
switch (Val) {
default: return -1;
@@ -1544,9 +1555,10 @@
GlobalValue::VisibilityTypes Visibility = GlobalValue::DefaultVisibility;
if (Record.size() > 6)
Visibility = GetDecodedVisibility(Record[6]);
- bool isThreadLocal = false;
+
+ GlobalVariable::ThreadLocalMode TLM = GlobalVariable::NotThreadLocal;
if (Record.size() > 7)
- isThreadLocal = Record[7];
+ TLM = GetDecodedThreadLocalMode(Record[7]);
bool UnnamedAddr = false;
if (Record.size() > 8)
@@ -1554,12 +1566,11 @@
GlobalVariable *NewGV =
new GlobalVariable(*TheModule, Ty, isConstant, Linkage, 0, "", 0,
- isThreadLocal, AddressSpace);
+ TLM, AddressSpace);
NewGV->setAlignment(Alignment);
if (!Section.empty())
NewGV->setSection(Section);
NewGV->setVisibility(Visibility);
- NewGV->setThreadLocal(isThreadLocal);
NewGV->setUnnamedAddr(UnnamedAddr);
ValueList.push_back(NewGV);