[TLS] New lower emutls pass, fix linkage bugs.
Previous implementation in http://reviews.llvm.org/D10522
created external references to __emutls_v.* variables.
Such references are inaccurate and cannot be handled by
all linkers, e.g. Android dynamic and gold linkers for aarch64.
Now a new LowerEmuTLS pass to go through all global variables,
and add emutls_v.* and emutls_t.* variables.
These __emutls* variables have the same linkage and
visibility as the associated user defined TLS variable.
Also removed old code that dump __emutls* variables in AsmPrinter.cpp,
and updated TLS unit tests.
Differential Revision: http://reviews.llvm.org/D15300
llvm-svn: 257718
diff --git a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index c64d882..df04533 100644
--- a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -3057,9 +3057,7 @@
Module *VariableModule = const_cast<Module*>(GA->getGlobal()->getParent());
StringRef EmuTlsVarName(NameString);
GlobalVariable *EmuTlsVar = VariableModule->getNamedGlobal(EmuTlsVarName);
- if (!EmuTlsVar)
- EmuTlsVar = dyn_cast_or_null<GlobalVariable>(
- VariableModule->getOrInsertGlobal(EmuTlsVarName, VoidPtrType));
+ assert(EmuTlsVar && "Cannot find EmuTlsVar ");
Entry.Node = DAG.getGlobalAddress(EmuTlsVar, dl, PtrVT);
Entry.Ty = VoidPtrType;
Args.push_back(Entry);