MS ABI: Implement thread_local for global variables

Summary:
This add support for the C++11 feature, thread_local global variables.
The ABI Clang implements is an improvement of the MSVC ABI.  Sadly,
further improvements could be made but not without sacrificing ABI
compatibility.

The feature is implemented as follows:
- All thread_local initialization routines are pointed to from the
  .CRT$XDU section.
- All non-weak thread_local variables have their initialization routines
  call from a single function instead of getting their own .CRT$XDU
  section entry.  This is done to open up optimization opportunities to
  the compiler.
- All weak thread_local variables have their own .CRT$XDU section entry.
  This entry is in a COMDAT with the global variable it is initializing;
  this ensures that we will initialize the global exactly once.
- Destructors are registered in the initialization function using
  __tlregdtor.

Differential Revision: http://reviews.llvm.org/D5597

llvm-svn: 219074

1 files changed, 4 insertions, 1 deletions

diff --git a/clang/lib/CodeGen/CodeGenFunction.h b/clang/lib/CodeGen/CodeGenFunction.h
index a4171a0..1ee45b5 100644
--- a/clang/lib/CodeGen/CodeGenFunction.h
+++ b/clang/lib/CodeGen/CodeGenFunction.h
@@ -2512,6 +2512,9 @@ public:
   void EmitCXXGlobalVarDeclInit(const VarDecl &D, llvm::Constant *DeclPtr,
                                 bool PerformInit);
 
+  llvm::Constant *createAtExitStub(const VarDecl &VD, llvm::Constant *Dtor,
+                                   llvm::Constant *Addr);
+
   /// Call atexit() with a function that passes the given argument to
   /// the given function.
   void registerGlobalDtorWithAtExit(const VarDecl &D, llvm::Constant *fn,
@@ -2528,7 +2531,7 @@ public:
   /// GenerateCXXGlobalInitFunc - Generates code for initializing global
   /// variables.
   void GenerateCXXGlobalInitFunc(llvm::Function *Fn,
-                                 ArrayRef<llvm::Constant *> Decls,
+                                 ArrayRef<llvm::Function *> CXXThreadLocals,
                                  llvm::GlobalVariable *Guard = nullptr);
 
   /// GenerateCXXGlobalDtorsFunc - Generates code for destroying global