Privatize the MDString uniquing table.

llvm-svn: 76113

1 files changed, 20 insertions, 1 deletions

diff --git a/llvm/lib/VMCore/LLVMContextImpl.cpp b/llvm/lib/VMCore/LLVMContextImpl.cpp
index 4c6319ea92c..93b9e7d3a53 100644
--- a/llvm/lib/VMCore/LLVMContextImpl.cpp
+++ b/llvm/lib/VMCore/LLVMContextImpl.cpp
@@ -78,4 +78,23 @@ ConstantFP *LLVMContextImpl::getConstantFP(const APFloat &V) {
   }
   
   return Slot;
-}
\ No newline at end of file
+}
+
+MDString *LLVMContextImpl::getMDString(const char *StrBegin,
+                                       const char *StrEnd) {
+  sys::SmartScopedWriter<true> Writer(ConstantsLock);
+  StringMapEntry<MDString *> &Entry = MDStringCache.GetOrCreateValue(
+                                        StrBegin, StrEnd);
+  MDString *&S = Entry.getValue();
+  if (!S) S = new MDString(Entry.getKeyData(),
+                           Entry.getKeyData() + Entry.getKeyLength());
+
+  return S;
+}
+
+// *** erase methods ***
+
+void LLVMContextImpl::erase(MDString *M) {
+  sys::SmartScopedWriter<true> Writer(ConstantsLock);
+  MDStringCache.erase(MDStringCache.find(M->StrBegin, M->StrEnd));
+}