Rename getNullPointer to getNull
Allow sharing of null pointer constants
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@709 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/VMCore/ConstPoolVals.cpp b/lib/VMCore/ConstPoolVals.cpp
index 6c054e1..eeb7a43 100644
--- a/lib/VMCore/ConstPoolVals.cpp
+++ b/lib/VMCore/ConstPoolVals.cpp
@@ -46,7 +46,7 @@
case Type::DoubleTyID: return ConstPoolFP::get(Ty, 0);
case Type::PointerTyID:
- return ConstPoolPointer::getNullPointer(cast<PointerType>(Ty));
+ return ConstPoolPointer::getNull(cast<PointerType>(Ty));
default:
return 0;
}
@@ -331,3 +331,15 @@
StructConstants.add(Ty, V, Result = new ConstPoolStruct(Ty, V));
return Result;
}
+
+//---- ConstPoolPointer::get() implementation...
+//
+static ValueMap<char, ConstPoolPointer> NullPtrConstants;
+
+ConstPoolPointer *ConstPoolPointer::getNull(const PointerType *Ty) {
+ ConstPoolPointer *Result = NullPtrConstants.get(Ty, 0);
+ if (!Result) // If no preexisting value, create one now...
+ NullPtrConstants.add(Ty, 0, Result = new ConstPoolPointer(Ty));
+ return Result;
+}
+