mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-23 11:13:28 +01:00
6bae49b565
This is (more?) usable by GDB pretty printers and seems nicer to write. There's one tricky caveat that in C++14 (LLVM's codebase today) the static constexpr member declaration is not a definition - so odr use of this constant requires an out of line definition, which won't be provided (that'd make all these trait classes more annoyidng/expensive to maintain). But the use of this constant in the library implementation is/should always be in a non-odr context - only two unit tests needed to be touched to cope with this/avoid odr using these constants. Based on/expanded from D72590 by Christian Sigg.
110 lines
3.3 KiB
C++
110 lines
3.3 KiB
C++
//===- llvm/unittest/ADT/PointerIntPairTest.cpp - Unit tests --------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/ADT/PointerIntPair.h"
|
|
#include "gtest/gtest.h"
|
|
#include <limits>
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
|
|
TEST(PointerIntPairTest, GetSet) {
|
|
struct S {
|
|
int i;
|
|
};
|
|
S s;
|
|
|
|
PointerIntPair<S *, 2> Pair(&s, 1U);
|
|
EXPECT_EQ(&s, Pair.getPointer());
|
|
EXPECT_EQ(1U, Pair.getInt());
|
|
|
|
Pair.setInt(2);
|
|
EXPECT_EQ(&s, Pair.getPointer());
|
|
EXPECT_EQ(2U, Pair.getInt());
|
|
|
|
Pair.setPointer(nullptr);
|
|
EXPECT_EQ(nullptr, Pair.getPointer());
|
|
EXPECT_EQ(2U, Pair.getInt());
|
|
|
|
Pair.setPointerAndInt(&s, 3U);
|
|
EXPECT_EQ(&s, Pair.getPointer());
|
|
EXPECT_EQ(3U, Pair.getInt());
|
|
|
|
// Make sure that we can perform all of our operations on enum classes.
|
|
//
|
|
// The concern is that enum classes are only explicitly convertible to
|
|
// integers. This means that if we assume in PointerIntPair this, a
|
|
// compilation error will result. This group of tests exercises the enum class
|
|
// code to make sure that we do not run into such issues in the future.
|
|
enum class E : unsigned {
|
|
Case1,
|
|
Case2,
|
|
Case3,
|
|
};
|
|
PointerIntPair<S *, 2, E> Pair2(&s, E::Case1);
|
|
EXPECT_EQ(&s, Pair2.getPointer());
|
|
EXPECT_EQ(E::Case1, Pair2.getInt());
|
|
|
|
Pair2.setInt(E::Case2);
|
|
EXPECT_EQ(&s, Pair2.getPointer());
|
|
EXPECT_EQ(E::Case2, Pair2.getInt());
|
|
|
|
Pair2.setPointer(nullptr);
|
|
EXPECT_EQ(nullptr, Pair2.getPointer());
|
|
EXPECT_EQ(E::Case2, Pair2.getInt());
|
|
|
|
Pair2.setPointerAndInt(&s, E::Case3);
|
|
EXPECT_EQ(&s, Pair2.getPointer());
|
|
EXPECT_EQ(E::Case3, Pair2.getInt());
|
|
|
|
static_assert(is_trivially_copyable<PointerIntPair<S *, 2, E>>::value,
|
|
"trivially copyable");
|
|
}
|
|
|
|
TEST(PointerIntPairTest, DefaultInitialize) {
|
|
PointerIntPair<float *, 2> Pair;
|
|
EXPECT_EQ(nullptr, Pair.getPointer());
|
|
EXPECT_EQ(0U, Pair.getInt());
|
|
}
|
|
|
|
// In real code this would be a word-sized integer limited to 31 bits.
|
|
struct Fixnum31 {
|
|
uintptr_t Value;
|
|
};
|
|
struct FixnumPointerTraits {
|
|
static inline void *getAsVoidPointer(Fixnum31 Num) {
|
|
return reinterpret_cast<void *>(Num.Value << NumLowBitsAvailable);
|
|
}
|
|
static inline Fixnum31 getFromVoidPointer(void *P) {
|
|
// In real code this would assert that the value is in range.
|
|
return {reinterpret_cast<uintptr_t>(P) >> NumLowBitsAvailable};
|
|
}
|
|
static constexpr int NumLowBitsAvailable =
|
|
std::numeric_limits<uintptr_t>::digits - 31;
|
|
};
|
|
TEST(PointerIntPairTest, ManyUnusedBits) {
|
|
|
|
PointerIntPair<Fixnum31, 1, bool, FixnumPointerTraits> pair;
|
|
EXPECT_EQ((uintptr_t)0, pair.getPointer().Value);
|
|
EXPECT_FALSE(pair.getInt());
|
|
|
|
pair.setPointerAndInt({ 0x7FFFFFFF }, true );
|
|
EXPECT_EQ((uintptr_t)0x7FFFFFFF, pair.getPointer().Value);
|
|
EXPECT_TRUE(pair.getInt());
|
|
|
|
EXPECT_EQ(FixnumPointerTraits::NumLowBitsAvailable - 1,
|
|
(int)PointerLikeTypeTraits<decltype(pair)>::NumLowBitsAvailable);
|
|
|
|
static_assert(
|
|
is_trivially_copyable<
|
|
PointerIntPair<Fixnum31, 1, bool, FixnumPointerTraits>>::value,
|
|
"trivially copyable");
|
|
}
|
|
|
|
} // end anonymous namespace
|