Add tests for WeakVH and AssertingVH. These pointed out that the overloads for

the comparison operators were not only unnecessary in the presence of the
implicit conversion; they caused ambiguous overload errors. So I deleted them.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70243 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/ValueHandle.h

@@ -39,7 +39,7 @@ public:
 class ValueHandleBase {
   friend class Value;
 protected:
-  /// HandleBaseKind - This indicates what base class the handle actually is.
+  /// HandleBaseKind - This indicates what sub class the handle actually is.
   /// This is to avoid having a vtable for the light-weight handle pointers. The
   /// fully generally Callback version does have a vtable.
   enum HandleBaseKind {
@@ -87,20 +87,7 @@ public:
   
   Value *operator->() const { return getValPtr(); }
   Value &operator*() const { return *getValPtr(); }
-  
-  bool operator==(const Value *RHS) const { return VP == RHS; }
-  bool operator==(const ValueHandleBase &RHS) const { return VP == RHS.VP; }
-  bool operator!=(const Value *RHS) const { return VP != RHS; }
-  bool operator!=(const ValueHandleBase &RHS) const { return VP != RHS.VP; }
-  bool operator<(const Value *RHS) const { return VP < RHS; }
-  bool operator<(const ValueHandleBase &RHS) const { return VP < RHS.VP; }
-  bool operator>(const Value *RHS) const { return VP > RHS; }
-  bool operator>(const ValueHandleBase &RHS) const { return VP > RHS.VP; }
-  bool operator<=(const Value *RHS) const { return VP <= RHS; }
-  bool operator<=(const ValueHandleBase &RHS) const { return VP <= RHS.VP; }
-  bool operator>=(const Value *RHS) const { return VP >= RHS; }
-  bool operator>=(const ValueHandleBase &RHS) const { return VP >= RHS.VP; }
-  
+
 protected:
   Value *getValPtr() const { return VP; }
 private:
@@ -198,33 +185,6 @@ public:
 
   ValueTy *operator->() const { return getValPtr(); }
   ValueTy &operator*() const { return *getValPtr(); }
-
-  // Duplicate these from the base class so that they work when assertions are
-  // off.
-  bool operator==(const Value *RHS) const { return getValPtr() == RHS; }
-  bool operator!=(const Value *RHS) const { return getValPtr() != RHS; }
-  bool operator<(const Value *RHS) const { return getValPtr() < RHS; }
-  bool operator>(const Value *RHS) const { return getValPtr() > RHS; }
-  bool operator<=(const Value *RHS) const { return getValPtr() <= RHS; }
-  bool operator>=(const Value *RHS) const { return getValPtr() >= RHS; }
-  bool operator==(const AssertingVH &RHS) const {
-    return getValPtr() == RHS.getValPtr();
-  }
-  bool operator!=(const AssertingVH &RHS) const {
-    return getValPtr() != RHS.getValPtr();
-  }
-  bool operator<(const AssertingVH &RHS) const {
-    return getValPtr() < RHS.getValPtr();
-  }
-  bool operator>(const AssertingVH &RHS) const {
-    return getValPtr() > RHS.getValPtr();
-  }
-  bool operator<=(const AssertingVH &RHS) const {
-    return getValPtr() <= RHS.getValPtr();
-  }
-  bool operator>=(const AssertingVH &RHS) const {
-    return getValPtr() >= RHS.getValPtr();
-  }
 };
 
 } // End llvm namespace

unittests/Support/ValueHandleTest.cpp

@@ -0,0 +1,181 @@
+//===- llvm/unittest/Support/ValueHandleTest.cpp - ValueHandle tests --------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/ValueHandle.h"
+
+#include "llvm/Constants.h"
+#include "llvm/Instructions.h"
+
+#include "gtest/gtest.h"
+
+#include <memory>
+
+using namespace llvm;
+
+namespace {
+
+class ValueHandle : public testing::Test {
+protected:
+  Constant *ConstantV;
+  std::auto_ptr<BitCastInst> BitcastV;
+
+  ValueHandle() : ConstantV(ConstantInt::get(Type::Int32Ty, 0)),
+                  BitcastV(new BitCastInst(ConstantV, Type::Int32Ty)) {
+  }
+};
+
+TEST_F(ValueHandle, WeakVH_BasicOperation) {
+  WeakVH WVH(BitcastV.get());
+  EXPECT_EQ(BitcastV.get(), WVH);
+  WVH = ConstantV;
+  EXPECT_EQ(ConstantV, WVH);
+
+  // Make sure I can call a method on the underlying Value.  It
+  // doesn't matter which method.
+  EXPECT_EQ(Type::Int32Ty, WVH->getType());
+  EXPECT_EQ(Type::Int32Ty, (*WVH).getType());
+}
+
+TEST_F(ValueHandle, WeakVH_Comparisons) {
+  WeakVH BitcastWVH(BitcastV.get());
+  WeakVH ConstantWVH(ConstantV);
+
+  EXPECT_TRUE(BitcastWVH == BitcastWVH);
+  EXPECT_TRUE(BitcastV.get() == BitcastWVH);
+  EXPECT_TRUE(BitcastWVH == BitcastV.get());
+  EXPECT_FALSE(BitcastWVH == ConstantWVH);
+
+  EXPECT_TRUE(BitcastWVH != ConstantWVH);
+  EXPECT_TRUE(BitcastV.get() != ConstantWVH);
+  EXPECT_TRUE(BitcastWVH != ConstantV);
+  EXPECT_FALSE(BitcastWVH != BitcastWVH);
+
+  // Cast to Value* so comparisons work.
+  Value *BV = BitcastV.get();
+  Value *CV = ConstantV;
+  EXPECT_EQ(BV < CV, BitcastWVH < ConstantWVH);
+  EXPECT_EQ(BV <= CV, BitcastWVH <= ConstantWVH);
+  EXPECT_EQ(BV > CV, BitcastWVH > ConstantWVH);
+  EXPECT_EQ(BV >= CV, BitcastWVH >= ConstantWVH);
+
+  EXPECT_EQ(BV < CV, BitcastV.get() < ConstantWVH);
+  EXPECT_EQ(BV <= CV, BitcastV.get() <= ConstantWVH);
+  EXPECT_EQ(BV > CV, BitcastV.get() > ConstantWVH);
+  EXPECT_EQ(BV >= CV, BitcastV.get() >= ConstantWVH);
+
+  EXPECT_EQ(BV < CV, BitcastWVH < ConstantV);
+  EXPECT_EQ(BV <= CV, BitcastWVH <= ConstantV);
+  EXPECT_EQ(BV > CV, BitcastWVH > ConstantV);
+  EXPECT_EQ(BV >= CV, BitcastWVH >= ConstantV);
+}
+
+TEST_F(ValueHandle, WeakVH_FollowsRAUW) {
+  WeakVH WVH(BitcastV.get());
+  WeakVH WVH_Copy(WVH);
+  WeakVH WVH_Recreated(BitcastV.get());
+  BitcastV->replaceAllUsesWith(ConstantV);
+  EXPECT_EQ(ConstantV, WVH);
+  EXPECT_EQ(ConstantV, WVH_Copy);
+  EXPECT_EQ(ConstantV, WVH_Recreated);
+}
+
+TEST_F(ValueHandle, WeakVH_NullOnDeletion) {
+  WeakVH WVH(BitcastV.get());
+  WeakVH WVH_Copy(WVH);
+  WeakVH WVH_Recreated(BitcastV.get());
+  BitcastV.reset();
+  Value *null_value = NULL;
+  EXPECT_EQ(null_value, WVH);
+  EXPECT_EQ(null_value, WVH_Copy);
+  EXPECT_EQ(null_value, WVH_Recreated);
+}
+
+
+TEST_F(ValueHandle, AssertingVH_BasicOperation) {
+  AssertingVH<CastInst> AVH(BitcastV.get());
+  CastInst *implicit_to_exact_type = AVH;
+  implicit_to_exact_type = implicit_to_exact_type;  // Avoid warning.
+
+  AssertingVH<Value> GenericAVH(BitcastV.get());
+  EXPECT_EQ(BitcastV.get(), GenericAVH);
+  GenericAVH = ConstantV;
+  EXPECT_EQ(ConstantV, GenericAVH);
+
+  // Make sure I can call a method on the underlying CastInst.  It
+  // doesn't matter which method.
+  EXPECT_FALSE(AVH->mayWriteToMemory());
+  EXPECT_FALSE((*AVH).mayWriteToMemory());
+}
+
+TEST_F(ValueHandle, AssertingVH_Comparisons) {
+  AssertingVH<Value> BitcastAVH(BitcastV.get());
+  AssertingVH<Value> ConstantAVH(ConstantV);
+
+  EXPECT_TRUE(BitcastAVH == BitcastAVH);
+  EXPECT_TRUE(BitcastV.get() == BitcastAVH);
+  EXPECT_TRUE(BitcastAVH == BitcastV.get());
+  EXPECT_FALSE(BitcastAVH == ConstantAVH);
+
+  EXPECT_TRUE(BitcastAVH != ConstantAVH);
+  EXPECT_TRUE(BitcastV.get() != ConstantAVH);
+  EXPECT_TRUE(BitcastAVH != ConstantV);
+  EXPECT_FALSE(BitcastAVH != BitcastAVH);
+
+  // Cast to Value* so comparisons work.
+  Value *BV = BitcastV.get();
+  Value *CV = ConstantV;
+  EXPECT_EQ(BV < CV, BitcastAVH < ConstantAVH);
+  EXPECT_EQ(BV <= CV, BitcastAVH <= ConstantAVH);
+  EXPECT_EQ(BV > CV, BitcastAVH > ConstantAVH);
+  EXPECT_EQ(BV >= CV, BitcastAVH >= ConstantAVH);
+
+  EXPECT_EQ(BV < CV, BitcastV.get() < ConstantAVH);
+  EXPECT_EQ(BV <= CV, BitcastV.get() <= ConstantAVH);
+  EXPECT_EQ(BV > CV, BitcastV.get() > ConstantAVH);
+  EXPECT_EQ(BV >= CV, BitcastV.get() >= ConstantAVH);
+
+  EXPECT_EQ(BV < CV, BitcastAVH < ConstantV);
+  EXPECT_EQ(BV <= CV, BitcastAVH <= ConstantV);
+  EXPECT_EQ(BV > CV, BitcastAVH > ConstantV);
+  EXPECT_EQ(BV >= CV, BitcastAVH >= ConstantV);
+}
+
+TEST_F(ValueHandle, AssertingVH_DoesNotFollowRAUW) {
+  AssertingVH<Value> AVH(BitcastV.get());
+  BitcastV->replaceAllUsesWith(ConstantV);
+  EXPECT_EQ(BitcastV.get(), AVH);
+}
+
+#ifdef NDEBUG
+
+TEST_F(ValueHandle, AssertingVH_ReducesToPointer) {
+  EXPECT_EQ(sizeof(CastInst *), sizeof(AssertingVH<CastInst>));
+}
+
+#else  // !NDEBUG
+
+#ifdef GTEST_HAS_DEATH_TEST
+
+TEST_F(ValueHandle, AssertingVH_Asserts) {
+  AssertingVH<Value> AVH(BitcastV.get());
+  EXPECT_DEATH({BitcastV.reset();},
+               "An asserting value handle still pointed to this value!");
+  AssertingVH<Value> Copy(AVH);
+  AVH = NULL;
+  EXPECT_DEATH({BitcastV.reset();},
+               "An asserting value handle still pointed to this value!");
+  Copy = NULL;
+  BitcastV.reset();
+}
+
+#endif  // GTEST_HAS_DEATH_TEST
+
+#endif  // NDEBUG
+
+}