Support for allocation of TLS variables in the JIT. Allocation of a global

variable is moved to the execution engine. The JIT calls the TargetJITInfo
to allocate thread local storage. Currently, only linux/x86 knows how to
allocate thread local global variables.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58142 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 26 insertions, 1 deletions

diff --git a/lib/ExecutionEngine/JIT/JIT.cpp b/lib/ExecutionEngine/JIT/JIT.cpp
index f57de17..b768f4d 100644
--- a/lib/ExecutionEngine/JIT/JIT.cpp
+++ b/lib/ExecutionEngine/JIT/JIT.cpp
@@ -562,7 +562,12 @@ void *JIT::getOrEmitGlobalVariable(const GlobalVariable *GV) {
     const Type *GlobalType = GV->getType()->getElementType();
     size_t S = getTargetData()->getABITypeSize(GlobalType);
     size_t A = getTargetData()->getPreferredAlignment(GV);
-    Ptr = MCE->allocateSpace(S, A);
+    if (GV->isThreadLocal()) {
+      MutexGuard locked(lock);
+      Ptr = TJI.allocateThreadLocalMemory(S);
+    } else {
+      Ptr = MCE->allocateSpace(S, A);
+    }
     addGlobalMapping(GV, Ptr);
     EmitGlobalVariable(GV);
   }
@@ -594,3 +599,17 @@ void *JIT::recompileAndRelinkFunction(Function *F) {
   return Addr;
 }
 
+/// getMemoryForGV - This method abstracts memory allocation of global
+/// variable so that the JIT can allocate thread local variables depending
+/// on the target.
+///
+char* JIT::getMemoryForGV(const GlobalVariable* GV) {
+  const Type *ElTy = GV->getType()->getElementType();
+  size_t GVSize = (size_t)getTargetData()->getABITypeSize(ElTy);
+  if (GV->isThreadLocal()) {
+    MutexGuard locked(lock);
+    return TJI.allocateThreadLocalMemory(GVSize);
+  } else {
+    return new char[GVSize];
+  }
+}
diff --git a/lib/ExecutionEngine/JIT/JIT.h b/lib/ExecutionEngine/JIT/JIT.h
index 41fa9bd..2eee2e9 100644
--- a/lib/ExecutionEngine/JIT/JIT.h
+++ b/lib/ExecutionEngine/JIT/JIT.h
@@ -134,6 +134,12 @@ public:
 private:
   static MachineCodeEmitter *createEmitter(JIT &J, JITMemoryManager *JMM);
   void runJITOnFunction (Function *F);
+  
+protected:
+
+  /// getMemoryforGV - Allocate memory for a global variable.
+  virtual char* getMemoryForGV(const GlobalVariable* GV);
+
 };
 
 } // End llvm namespace