[ADT] Fix PointerEmbeddedInt when the underlying type is uintptr_t.

...and when you try to store negative values in it.

llvm-svn: 261259

1 files changed, 34 insertions, 0 deletions

diff --git a/llvm/unittests/ADT/PointerEmbeddedIntTest.cpp b/llvm/unittests/ADT/PointerEmbeddedIntTest.cpp
index b10365a2f61..9c27f8ee655 100644
--- a/llvm/unittests/ADT/PointerEmbeddedIntTest.cpp
+++ b/llvm/unittests/ADT/PointerEmbeddedIntTest.cpp
@@ -43,4 +43,38 @@ TEST(PointerEmbeddedIntTest, Basic) {
   EXPECT_FALSE(42 >= J);
 }
 
+TEST(PointerEmbeddedIntTest, intptr_t) {
+  PointerEmbeddedInt<intptr_t, CHAR_BIT> IPos = 42, INeg = -42;
+  EXPECT_EQ(42, IPos);
+  EXPECT_EQ(-42, INeg);
+
+  PointerEmbeddedInt<uintptr_t, CHAR_BIT> U = 42, USaturated = 255;
+  EXPECT_EQ(42U, U);
+  EXPECT_EQ(255U, USaturated);
+
+  PointerEmbeddedInt<intptr_t, std::numeric_limits<intptr_t>::digits>
+      IMax = std::numeric_limits<intptr_t>::max() >> 1,
+      IMin = std::numeric_limits<intptr_t>::min() >> 1;
+  EXPECT_EQ(std::numeric_limits<intptr_t>::max() >> 1, IMax);
+  EXPECT_EQ(std::numeric_limits<intptr_t>::min() >> 1, IMin);
+
+  PointerEmbeddedInt<uintptr_t, std::numeric_limits<uintptr_t>::digits - 1>
+      UMax = std::numeric_limits<uintptr_t>::max() >> 1,
+      UMin = std::numeric_limits<uintptr_t>::min() >> 1;
+  EXPECT_EQ(std::numeric_limits<uintptr_t>::max() >> 1, UMax);
+  EXPECT_EQ(std::numeric_limits<uintptr_t>::min() >> 1, UMin);
+}
+
+TEST(PointerEmbeddedIntTest, PointerLikeTypeTraits) {
+  PointerEmbeddedInt<int, CHAR_BIT> I = 42;
+  using ITraits = PointerLikeTypeTraits<decltype(I)>;
+  EXPECT_EQ(42, ITraits::getFromVoidPointer(ITraits::getAsVoidPointer(I)));
+
+  PointerEmbeddedInt<uintptr_t, std::numeric_limits<uintptr_t>::digits - 1>
+      Max = std::numeric_limits<uintptr_t>::max() >> 1;
+  using MaxTraits = PointerLikeTypeTraits<decltype(Max)>;
+  EXPECT_EQ(std::numeric_limits<uintptr_t>::max() >> 1,
+            MaxTraits::getFromVoidPointer(MaxTraits::getAsVoidPointer(Max)));
+}
+
 } // end anonymous namespace