[llvm] r180929 - Provide an API to temporarily suppress DebugLocations from being attached

[Adrian Prantl]

Author: adrian
Date: Thu May  2 12:27:49 2013
New Revision: 180929

URL: http://llvm.org/viewvc/llvm-project?rev=180929&view=rev
Log:
Provide an API to temporarily suppress DebugLocations from being attached
to emitted instructions.  Use this if you want an instruction to be
counted towards the prologue or if there is no useful source location.

rdar://problem/13442648

Modified:
    llvm/trunk/include/llvm/IR/IRBuilder.h

Modified: llvm/trunk/include/llvm/IR/IRBuilder.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/IR/IRBuilder.h?rev=180929&r1=180928&r2=180929&view=diff
==============================================================================
--- llvm/trunk/include/llvm/IR/IRBuilder.h (original)
+++ llvm/trunk/include/llvm/IR/IRBuilder.h Thu May  2 12:27:49 2013
@@ -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; }