1 files changed, 21 insertions, 0 deletions
diff --git a/include/llvm/IR/IRBuilder.h b/include/llvm/IR/IRBuilder.h
index 189ba3d305..f11d3b4e0b 100644
--- a/include/llvm/IR/IRBuilder.h
+++ b/include/llvm/IR/IRBuilder.h
@@ -49,6 +49,10 @@ protected:
 class IRBuilderBase {
   DebugLoc CurDbgLocation;
 protected:
+  /// Save the current debug location here while we are suppressing
+  /// line table entries.
+  llvm::DebugLoc SavedDbgLocation;
+
   BasicBlock *BB;
   BasicBlock::iterator InsertPt;
   LLVMContext &Context;
@@ -113,6 +117,23 @@ public:
     CurDbgLocation = L;
   }
 
+  /// \brief Temporarily suppress DebugLocations from being attached
+  /// to emitted instructions, until the next call to
+  /// SetCurrentDebugLocation() or EnableDebugLocations().  Use this
+  /// if you want an instruction to be counted towards the prologue or
+  /// if there is no useful source location.
+  void DisableDebugLocations() {
+    llvm::DebugLoc Empty;
+    SavedDbgLocation = getCurrentDebugLocation();
+    SetCurrentDebugLocation(Empty);
+  }
+
+  /// \brief Restore the previously saved DebugLocation.
+  void EnableDebugLocations() {
+    assert(CurDbgLocation.isUnknown());
+    SetCurrentDebugLocation(SavedDbgLocation);
+  }
+
   /// \brief Get location information used by debugging information.
   DebugLoc getCurrentDebugLocation() const { return CurDbgLocation; }