[PATCH] Re-add DataLayout convenience functions for getting pointer size

[Matt Arsenault]

These were reverted in r167222 along with the rest of the last different address space pointer size attempt. These will be used in later commits.

http://llvm-reviews.chandlerc.com/D1197

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

Index: include/llvm/IR/DataLayout.h
===================================================================
--- include/llvm/IR/DataLayout.h
+++ include/llvm/IR/DataLayout.h
@@ -271,6 +271,27 @@
   unsigned getPointerSizeInBits(unsigned AS = 0) const {
     return getPointerSize(AS) * 8;
   }
+
+  /// Layout pointer size, in bits, based on the type.
+  /// If this function is called with a pointer type, then
+  /// the type size of the pointer is returned.
+  /// If this function is called with a vector of pointers,
+  /// then the type size of the pointer is returned.
+  /// Otherwise the type sizeof a default pointer is returned.
+  unsigned getPointerTypeSizeInBits(Type *) const;
+
+  unsigned getPointerTypeSizeInBits(Value *V) const {
+    return getPointerTypeSizeInBits(V->getType());
+  }
+
+  unsigned getPointerTypeSize(Type *Ty) const {
+    return getPointerTypeSizeInBits(Ty) / 8;
+  }
+
+  unsigned getPointerTypeSize(Value *V) const {
+    return getPointerTypeSizeInBits(V) / 8;
+  }
+
   /// Size examples:
   ///
   /// Type        SizeInBits  StoreSizeInBits  AllocSizeInBits[*]
Index: lib/IR/DataLayout.cpp
===================================================================
--- lib/IR/DataLayout.cpp
+++ lib/IR/DataLayout.cpp
@@ -507,6 +507,18 @@
   return OS.str();
 }
 
+unsigned DataLayout::getPointerTypeSizeInBits(Type *Ty) const {
+  if (Ty->isPointerTy())
+    return getTypeSizeInBits(Ty);
+
+  if (VectorType *VT = dyn_cast<VectorType>(Ty)) {
+    Type *EleTy = VT->getElementType();
+    if (EleTy->isPointerTy())
+      return getTypeSizeInBits(EleTy);
+  }
+
+  return getPointerSizeInBits(0);
+}
 
 /*!
   \param abi_or_pref Flag that determines which alignment is returned. true
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