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, 11 insertions, 0 deletions

diff --git a/include/llvm/ExecutionEngine/ExecutionEngine.h b/include/llvm/ExecutionEngine/ExecutionEngine.h
index 59db630..1ee8241 100644
--- a/include/llvm/ExecutionEngine/ExecutionEngine.h
+++ b/include/llvm/ExecutionEngine/ExecutionEngine.h
@@ -76,6 +76,9 @@ protected:
   void setTargetData(const TargetData *td) {
     TD = td;
   }
+  
+  /// getMemoryforGV - Allocate memory for a global variable.
+  virtual char* getMemoryForGV(const GlobalVariable* GV);
 
   // To avoid having libexecutionengine depend on the JIT and interpreter
   // libraries, the JIT and Interpreter set these functions to ctor pointers
diff --git a/include/llvm/Target/TargetJITInfo.h b/include/llvm/Target/TargetJITInfo.h
index 6e1eb43..81e4c87 100644
--- a/include/llvm/Target/TargetJITInfo.h
+++ b/include/llvm/Target/TargetJITInfo.h
@@ -93,6 +93,14 @@ namespace llvm {
                           unsigned NumRelocs, unsigned char* GOTBase) {
       assert(NumRelocs == 0 && "This target does not have relocations!");
     }
+    
+
+    /// allocateThreadLocalMemory - Each target has its own way of
+    /// handling thread local variables. This method returns a value only
+    /// meaningful to the target.
+    virtual char* allocateThreadLocalMemory(size_t size) {
+      assert(0 && "This target does not implement thread local storage!");
+    }
 
     /// needsGOT - Allows a target to specify that it would like the
     // JIT to manage a GOT for it.