[llvm] r218828 - Revert "DIBuilder: Remove dead code"

[Duncan P. N. Exon Smith]

Author: dexonsmith
Date: Wed Oct  1 16:32:12 2014
New Revision: 218828

URL: http://llvm.org/viewvc/llvm-project?rev=218828&view=rev
Log:
Revert "DIBuilder: Remove dead code"

This reverts commit r218820.  It turns out that Adrian has an
outstanding SROA patch that uses this.

I've updated it to forward to `createExpression()`.

Modified:
    llvm/trunk/include/llvm/IR/DIBuilder.h
    llvm/trunk/lib/IR/DIBuilder.cpp

Modified: llvm/trunk/include/llvm/IR/DIBuilder.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/IR/DIBuilder.h?rev=218828&r1=218827&r2=218828&view=diff
==============================================================================
--- llvm/trunk/include/llvm/IR/DIBuilder.h (original)
+++ llvm/trunk/include/llvm/IR/DIBuilder.h Wed Oct  1 16:32:12 2014
@@ -505,6 +505,14 @@ namespace llvm {
     /// @param Addr        An array of complex address operations.
     DIExpression createExpression(ArrayRef<int64_t> Addr = None);
 
+    /// createPieceExpression - Create a descriptor to describe one part
+    /// of aggregate variable that is fragmented across multiple Values.
+    ///
+    /// @param OffsetInBytes Offset of the piece in bytes.
+    /// @param SizeInBytes   Size of the piece in bytes.
+    DIExpression createPieceExpression(unsigned OffsetInBytes,
+                                       unsigned SizeInBytes);
+
     /// createFunction - Create a new descriptor for the specified subprogram.
     /// See comments in DISubprogram for descriptions of these fields.
     /// @param Scope         Function scope.

Modified: llvm/trunk/lib/IR/DIBuilder.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/IR/DIBuilder.cpp?rev=218828&r1=218827&r2=218828&view=diff
==============================================================================
--- llvm/trunk/lib/IR/DIBuilder.cpp (original)
+++ llvm/trunk/lib/IR/DIBuilder.cpp Wed Oct  1 16:32:12 2014
@@ -1056,6 +1056,12 @@ DIExpression DIBuilder::createExpression
   return DIExpression(MDNode::get(VMContext, Elts));
 }
 
+DIExpression DIBuilder::createPieceExpression(unsigned OffsetInBytes,
+                                              unsigned SizeInBytes) {
+  int64_t Addr[] = {dwarf::DW_OP_piece, OffsetInBytes, SizeInBytes};
+  return createExpression(Addr);
+}
+
 /// createFunction - Create a new descriptor for the specified function.
 /// FIXME: this is added for dragonegg. Once we update dragonegg
 /// to call resolve function, this will be removed.