Remove the experimental AliasAnalysis::getDependency interface, which

isn't a good level of abstraction for memdep. Instead, generalize
AliasAnalysis::alias and related interfaces with a new Location
class for describing a memory location. For now, this is the same
Pointer and Size as before, plus an additional field for a TBAA tag.

Also, introduce a fixed MD_tbaa metadata tag kind.

llvm-svn: 113858

1 files changed, 8 insertions, 1 deletions

diff --git a/llvm/lib/VMCore/LLVMContext.cpp b/llvm/lib/VMCore/LLVMContext.cpp
index 60fb830e9b5..15ae0ec5d5a 100644
--- a/llvm/lib/VMCore/LLVMContext.cpp
+++ b/llvm/lib/VMCore/LLVMContext.cpp
@@ -28,9 +28,16 @@ LLVMContext& llvm::getGlobalContext() {
 }
 
 LLVMContext::LLVMContext() : pImpl(new LLVMContextImpl(*this)) {
-  // Create the first metadata kind, which is always 'dbg'.
+  // Create the fixed metadata kinds. This is done in the same order as the
+  // MD_* enum values so that they correspond.
+
+  // Create the 'dbg' metadata kind. 
   unsigned DbgID = getMDKindID("dbg");
   assert(DbgID == MD_dbg && "dbg kind id drifted"); (void)DbgID;
+
+  // Create the 'tbaa' metadata kind.
+  unsigned TBAAID = getMDKindID("tbaa");
+  assert(TBAAID == MD_tbaa && "tbaa kind id drifted"); (void)TBAAID;
 }
 LLVMContext::~LLVMContext() { delete pImpl; }