BumpPtrAllocator: use uintptr_t when aligning addresses to avoid undefined behaviour

[oota-llvm.git] / unittests / Support / Casting.cpp

diff --git a/unittests/Support/Casting.cpp b/unittests/Support/Casting.cpp
index dc0205f325f2e35bf4d19b654f447cf64e73e30e..88c7d19aa464bfe1af80f0d6fc1e4a1a9d407757 100644 (file)
--- a/unittests/Support/Casting.cpp
+++ b/unittests/Support/Casting.cpp
@@ -8,13 +8,17 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Support/Casting.h"
+#include "llvm/IR/User.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
-
 #include "gtest/gtest.h"
 #include <cstdlib>
 
 namespace llvm {
+// Used to test illegal cast. If a cast doesn't match any of the "real" ones,
+// it will match this one.
+struct IllegalCast;
+template <typename T> IllegalCast *cast(...) { return nullptr; }
 
 // set up two example classes
 // with conversion facility
@@ -61,13 +65,32 @@ foo *bar::naz() {
 
 
 bar *fub();
+
+template <> struct simplify_type<foo> {
+  typedef int SimpleType;
+  static SimpleType getSimplifiedValue(foo &Val) { return 0; }
+};
+
 } // End llvm namespace
 
 using namespace llvm;
 
+
+// Test the peculiar behavior of Use in simplify_type.
+static_assert(std::is_same<simplify_type<Use>::SimpleType, Value *>::value,
+              "Use doesn't simplify correctly!");
+static_assert(std::is_same<simplify_type<Use *>::SimpleType, Value *>::value,
+              "Use doesn't simplify correctly!");
+
+// Test that a regular class behaves as expected.
+static_assert(std::is_same<simplify_type<foo>::SimpleType, int>::value,
+              "Unexpected simplify_type result!");
+static_assert(std::is_same<simplify_type<foo *>::SimpleType, foo *>::value,
+              "Unexpected simplify_type result!");
+
 namespace {
 
-const foo *null_foo = NULL;
+const foo *null_foo = nullptr;
 
 bar B;
 extern bar &B1;
@@ -152,4 +175,60 @@ TEST(CastingTest, dyn_cast_or_null) {
 const bar *B2 = &B;
 }  // anonymous namespace
 
-bar *llvm::fub() { return 0; }
+bar *llvm::fub() { return nullptr; }
+
+namespace {
+namespace inferred_upcasting {
+// This test case verifies correct behavior of inferred upcasts when the
+// types are statically known to be OK to upcast. This is the case when,
+// for example, Derived inherits from Base, and we do `isa<Base>(Derived)`.
+
+// Note: This test will actually fail to compile without inferred
+// upcasting.
+
+class Base {
+public:
+  // No classof. We are testing that the upcast is inferred.
+  Base() {}
+};
+
+class Derived : public Base {
+public:
+  Derived() {}
+};
+
+// Even with no explicit classof() in Base, we should still be able to cast
+// Derived to its base class.
+TEST(CastingTest, UpcastIsInferred) {
+  Derived D;
+  EXPECT_TRUE(isa<Base>(D));
+  Base *BP = dyn_cast<Base>(&D);
+  EXPECT_TRUE(BP != nullptr);
+}
+
+
+// This test verifies that the inferred upcast takes precedence over an
+// explicitly written one. This is important because it verifies that the
+// dynamic check gets optimized away.
+class UseInferredUpcast {
+public:
+  int Dummy;
+  static bool classof(const UseInferredUpcast *) {
+    return false;
+  }
+};
+
+TEST(CastingTest, InferredUpcastTakesPrecedence) {
+  UseInferredUpcast UIU;
+  // Since the explicit classof() returns false, this will fail if the
+  // explicit one is used.
+  EXPECT_TRUE(isa<UseInferredUpcast>(&UIU));
+}
+
+} // end namespace inferred_upcasting
+} // end anonymous namespace
+// Test that we reject casts of temporaries (and so the illegal cast gets used).
+namespace TemporaryCast {
+struct pod {};
+IllegalCast *testIllegalCast() { return cast<foo>(pod()); }
+}