Don't treat 0 as a special value for int attributes.

Split the get() to not use a default value. This way
attributes can be added that have 0 as a legitimate value.

llvm-svn: 217107

2 files changed, 25 insertions, 8 deletions

diff --git a/llvm/include/llvm/IR/Attributes.h b/llvm/include/llvm/IR/Attributes.h
index 5ff48d68891..a6634cfdbe7 100644
--- a/llvm/include/llvm/IR/Attributes.h
+++ b/llvm/include/llvm/IR/Attributes.h
@@ -126,7 +126,8 @@ public:
   //===--------------------------------------------------------------------===//
 
   /// \brief Return a uniquified Attribute object.
-  static Attribute get(LLVMContext &Context, AttrKind Kind, uint64_t Val = 0);
+  static Attribute get(LLVMContext &Context, AttrKind Kind);
+  static Attribute get(LLVMContext &Context, AttrKind Kind, uint64_t Val);
   static Attribute get(LLVMContext &Context, StringRef Kind,
                        StringRef Val = StringRef());
 
@@ -273,13 +274,13 @@ public:
   /// \brief Remove the specified attribute at the specified index from this
   /// attribute list. Since attribute lists are immutable, this returns the new
   /// list.
-  AttributeSet removeAttribute(LLVMContext &C, unsigned Index, 
+  AttributeSet removeAttribute(LLVMContext &C, unsigned Index,
                                Attribute::AttrKind Attr) const;
 
   /// \brief Remove the specified attributes at the specified index from this
   /// attribute list. Since attribute lists are immutable, this returns the new
   /// list.
-  AttributeSet removeAttributes(LLVMContext &C, unsigned Index, 
+  AttributeSet removeAttributes(LLVMContext &C, unsigned Index,
                                 AttributeSet Attrs) const;
 
   //===--------------------------------------------------------------------===//
diff --git a/llvm/lib/IR/Attributes.cpp b/llvm/lib/IR/Attributes.cpp
index 04545ea919a..a2f1dd0593c 100644
--- a/llvm/lib/IR/Attributes.cpp
+++ b/llvm/lib/IR/Attributes.cpp
@@ -31,12 +31,31 @@ using namespace llvm;
 // Attribute Construction Methods
 //===----------------------------------------------------------------------===//
 
+Attribute Attribute::get(LLVMContext &Context, Attribute::AttrKind Kind) {
+  LLVMContextImpl *pImpl = Context.pImpl;
+  FoldingSetNodeID ID;
+  ID.AddInteger(Kind);
+
+  void *InsertPoint;
+  AttributeImpl *PA = pImpl->AttrsSet.FindNodeOrInsertPos(ID, InsertPoint);
+
+  if (!PA) {
+    // If we didn't find any existing attributes of the same shape then create a
+    // new one and insert it.
+    PA = new EnumAttributeImpl(Kind);
+    pImpl->AttrsSet.InsertNode(PA, InsertPoint);
+  }
+
+  // Return the Attribute that we found or created.
+  return Attribute(PA);
+}
+
 Attribute Attribute::get(LLVMContext &Context, Attribute::AttrKind Kind,
                          uint64_t Val) {
   LLVMContextImpl *pImpl = Context.pImpl;
   FoldingSetNodeID ID;
   ID.AddInteger(Kind);
-  if (Val) ID.AddInteger(Val);
+  ID.AddInteger(Val);
 
   void *InsertPoint;
   AttributeImpl *PA = pImpl->AttrsSet.FindNodeOrInsertPos(ID, InsertPoint);
@@ -44,10 +63,7 @@ Attribute Attribute::get(LLVMContext &Context, Attribute::AttrKind Kind,
   if (!PA) {
     // If we didn't find any existing attributes of the same shape then create a
     // new one and insert it.
-    if (!Val)
-      PA = new EnumAttributeImpl(Kind);
-    else
-      PA = new IntAttributeImpl(Kind, Val);
+    PA = new IntAttributeImpl(Kind, Val);
     pImpl->AttrsSet.InsertNode(PA, InsertPoint);
   }