[PATCH] Add isConstant argument to MDBuilder::createTBAAStructTagNode

[Artur Pilipenko]

According to the TBAA description struct-path tag node can  have an optional IsConstant field. Add corresponding argument to MDBuilder::createTBAAStructTagNode.

http://reviews.llvm.org/D10160

Files:
  include/llvm/IR/MDBuilder.h
  lib/IR/MDBuilder.cpp

Index: include/llvm/IR/MDBuilder.h
===================================================================
--- include/llvm/IR/MDBuilder.h
+++ include/llvm/IR/MDBuilder.h
@@ -153,7 +153,7 @@
   /// \brief Return metadata for a TBAA tag node with the given
   /// base type, access type and offset relative to the base type.
   MDNode *createTBAAStructTagNode(MDNode *BaseType, MDNode *AccessType,
-                                  uint64_t Offset);
+                                  uint64_t Offset, bool IsConstant = false);
 };
 
 } // end namespace llvm
Index: lib/IR/MDBuilder.cpp
===================================================================
--- lib/IR/MDBuilder.cpp
+++ lib/IR/MDBuilder.cpp
@@ -168,9 +168,10 @@
 /// \brief Return metadata for a TBAA tag node with the given
 /// base type, access type and offset relative to the base type.
 MDNode *MDBuilder::createTBAAStructTagNode(MDNode *BaseType, MDNode *AccessType,
-                                           uint64_t Offset) {
+                                           uint64_t Offset, bool IsConstant) {
   Type *Int64 = Type::getInt64Ty(Context);
-  Metadata *Ops[3] = {BaseType, AccessType,
-                      createConstant(ConstantInt::get(Int64, Offset))};
+  Metadata *Ops[4] = {BaseType, AccessType,
+                      createConstant(ConstantInt::get(Int64, Offset)),
+                      createConstant(ConstantInt::get(Int64, IsConstant))};
   return MDNode::get(Context, Ops);
 }

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