Move the TLSModel information into the TargetMachine rather than hiding

in TargetLowering. There was already a FIXME about this location being
odd. The interface is simplified as a consequence. This will also make
it easier to change TLS models when compiling with PIE.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154292 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/CodeGen.h

@@ -27,6 +27,16 @@ namespace llvm {
     enum Model { Default, JITDefault, Small, Kernel, Medium, Large };
   }
 
+  // TLS models.
+  namespace TLSModel {
+    enum Model {
+      GeneralDynamic,
+      LocalDynamic,
+      InitialExec,
+      LocalExec
+    };
+  }
+
   // Code generation optimization level.
   namespace CodeGenOpt {
     enum Level {

include/llvm/Target/TargetLowering.h

@@ -64,17 +64,6 @@ namespace llvm {
     };
   }
 
-  // FIXME: should this be here?
-  namespace TLSModel {
-    enum Model {
-      GeneralDynamic,
-      LocalDynamic,
-      InitialExec,
-      LocalExec
-    };
-  }
-  TLSModel::Model getTLSModel(const GlobalValue *GV, Reloc::Model reloc);
-
 
 //===----------------------------------------------------------------------===//
 /// TargetLowering - This class defines information used to lower LLVM code to

include/llvm/Target/TargetMachine.h

@@ -24,6 +24,7 @@ namespace llvm {
 
 class InstrItineraryData;
 class JITCodeEmitter;
+class GlobalValue;
 class MCAsmInfo;
 class MCCodeGenInfo;
 class MCContext;
@@ -195,6 +196,10 @@ public:
   /// medium, large, and target default.
   CodeModel::Model getCodeModel() const;
 
+  /// getTLSModel - Returns the TLS model which should be used for the given
+  /// global variable.
+  TLSModel::Model getTLSModel(const GlobalValue *GV) const;
+
   /// getOptLevel - Returns the optimization level: None, Less,
   /// Default, or Aggressive.
   CodeGenOpt::Level getOptLevel() const;

lib/CodeGen/SelectionDAG/TargetLowering.cpp

@@ -39,28 +39,6 @@ static cl::opt<bool>
 AllowPromoteIntElem("promote-elements", cl::Hidden, cl::init(true),
   cl::desc("Allow promotion of integer vector element types"));
 
-namespace llvm {
-TLSModel::Model getTLSModel(const GlobalValue *GV, Reloc::Model reloc) {
-  bool isLocal = GV->hasLocalLinkage();
-  bool isDeclaration = GV->isDeclaration();
-  // FIXME: what should we do for protected and internal visibility?
-  // For variables, is internal different from hidden?
-  bool isHidden = GV->hasHiddenVisibility();
-
-  if (reloc == Reloc::PIC_) {
-    if (isLocal || isHidden)
-      return TLSModel::LocalDynamic;
-    else
-      return TLSModel::GeneralDynamic;
-  } else {
-    if (!isDeclaration || isHidden)
-      return TLSModel::LocalExec;
-    else
-      return TLSModel::InitialExec;
-  }
-}
-}
-
 /// InitLibcallNames - Set default libcall names.
 ///
 static void InitLibcallNames(const char **Names) {

lib/Target/TargetMachine.cpp

@@ -11,6 +11,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "llvm/GlobalValue.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCCodeGenInfo.h"
 #include "llvm/Target/TargetMachine.h"
@@ -74,6 +75,26 @@ CodeModel::Model TargetMachine::getCodeModel() const {
   return CodeGenInfo->getCodeModel();
 }
 
+TLSModel::Model TargetMachine::getTLSModel(const GlobalValue *GV) const {
+  bool isLocal = GV->hasLocalLinkage();
+  bool isDeclaration = GV->isDeclaration();
+  // FIXME: what should we do for protected and internal visibility?
+  // For variables, is internal different from hidden?
+  bool isHidden = GV->hasHiddenVisibility();
+
+  if (getRelocationModel() == Reloc::PIC_) {
+    if (isLocal || isHidden)
+      return TLSModel::LocalDynamic;
+    else
+      return TLSModel::GeneralDynamic;
+  } else {
+    if (!isDeclaration || isHidden)
+      return TLSModel::LocalExec;
+    else
+      return TLSModel::InitialExec;
+  }
+}
+
 /// getOptLevel - Returns the optimization level: None, Less,
 /// Default, or Aggressive.
 CodeGenOpt::Level TargetMachine::getOptLevel() const {

lib/Target/X86/X86ISelLowering.cpp

@@ -7205,8 +7205,7 @@ X86TargetLowering::LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const {
     if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
       GV = GA->resolveAliasedGlobal(false);
 
-    TLSModel::Model model
-      = getTLSModel(GV, getTargetMachine().getRelocationModel());
+    TLSModel::Model model = getTargetMachine().getTLSModel(GV);
 
     switch (model) {
       case TLSModel::GeneralDynamic: