WholeProgramDevirt.cpp
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//===- WholeProgramDevirt.cpp - Unit tests for whole-program devirt -------===//
//
// 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/Transforms/IPO/WholeProgramDevirt.h"
#include "llvm/ADT/ArrayRef.h"
#include "gtest/gtest.h"
using namespace llvm;
using namespace wholeprogramdevirt;
TEST(WholeProgramDevirt, findLowestOffset) {
VTableBits VT1;
VT1.ObjectSize = 8;
VT1.Before.BytesUsed = {1 << 0};
VT1.After.BytesUsed = {1 << 1};
VTableBits VT2;
VT2.ObjectSize = 8;
VT2.Before.BytesUsed = {1 << 1};
VT2.After.BytesUsed = {1 << 0};
TypeMemberInfo TM1{&VT1, 0};
TypeMemberInfo TM2{&VT2, 0};
VirtualCallTarget Targets[] = {
{&TM1, /*IsBigEndian=*/false},
{&TM2, /*IsBigEndian=*/false},
};
EXPECT_EQ(2ull, findLowestOffset(Targets, /*IsAfter=*/false, 1));
EXPECT_EQ(66ull, findLowestOffset(Targets, /*IsAfter=*/true, 1));
EXPECT_EQ(8ull, findLowestOffset(Targets, /*IsAfter=*/false, 8));
EXPECT_EQ(72ull, findLowestOffset(Targets, /*IsAfter=*/true, 8));
TM1.Offset = 4;
EXPECT_EQ(33ull, findLowestOffset(Targets, /*IsAfter=*/false, 1));
EXPECT_EQ(65ull, findLowestOffset(Targets, /*IsAfter=*/true, 1));
EXPECT_EQ(40ull, findLowestOffset(Targets, /*IsAfter=*/false, 8));
EXPECT_EQ(72ull, findLowestOffset(Targets, /*IsAfter=*/true, 8));
TM1.Offset = 8;
TM2.Offset = 8;
EXPECT_EQ(66ull, findLowestOffset(Targets, /*IsAfter=*/false, 1));
EXPECT_EQ(2ull, findLowestOffset(Targets, /*IsAfter=*/true, 1));
EXPECT_EQ(72ull, findLowestOffset(Targets, /*IsAfter=*/false, 8));
EXPECT_EQ(8ull, findLowestOffset(Targets, /*IsAfter=*/true, 8));
VT1.After.BytesUsed = {0xff, 0, 0, 0, 0xff};
VT2.After.BytesUsed = {0xff, 1, 0, 0, 0};
EXPECT_EQ(16ull, findLowestOffset(Targets, /*IsAfter=*/true, 16));
EXPECT_EQ(40ull, findLowestOffset(Targets, /*IsAfter=*/true, 32));
}
TEST(WholeProgramDevirt, setReturnValues) {
VTableBits VT1;
VT1.ObjectSize = 8;
VTableBits VT2;
VT2.ObjectSize = 8;
TypeMemberInfo TM1{&VT1, 0};
TypeMemberInfo TM2{&VT2, 0};
VirtualCallTarget Targets[] = {
{&TM1, /*IsBigEndian=*/false},
{&TM2, /*IsBigEndian=*/false},
};
TM1.Offset = 4;
TM2.Offset = 4;
int64_t OffsetByte;
uint64_t OffsetBit;
Targets[0].RetVal = 1;
Targets[1].RetVal = 0;
setBeforeReturnValues(Targets, 32, 1, OffsetByte, OffsetBit);
EXPECT_EQ(-5ll, OffsetByte);
EXPECT_EQ(0ull, OffsetBit);
EXPECT_EQ(std::vector<uint8_t>{1}, VT1.Before.Bytes);
EXPECT_EQ(std::vector<uint8_t>{1}, VT1.Before.BytesUsed);
EXPECT_EQ(std::vector<uint8_t>{0}, VT2.Before.Bytes);
EXPECT_EQ(std::vector<uint8_t>{1}, VT2.Before.BytesUsed);
Targets[0].RetVal = 0;
Targets[1].RetVal = 1;
setBeforeReturnValues(Targets, 39, 1, OffsetByte, OffsetBit);
EXPECT_EQ(-5ll, OffsetByte);
EXPECT_EQ(7ull, OffsetBit);
EXPECT_EQ(std::vector<uint8_t>{1}, VT1.Before.Bytes);
EXPECT_EQ(std::vector<uint8_t>{0x81}, VT1.Before.BytesUsed);
EXPECT_EQ(std::vector<uint8_t>{0x80}, VT2.Before.Bytes);
EXPECT_EQ(std::vector<uint8_t>{0x81}, VT2.Before.BytesUsed);
Targets[0].RetVal = 12;
Targets[1].RetVal = 34;
setBeforeReturnValues(Targets, 40, 8, OffsetByte, OffsetBit);
EXPECT_EQ(-6ll, OffsetByte);
EXPECT_EQ(0ull, OffsetBit);
EXPECT_EQ((std::vector<uint8_t>{1, 12}), VT1.Before.Bytes);
EXPECT_EQ((std::vector<uint8_t>{0x81, 0xff}), VT1.Before.BytesUsed);
EXPECT_EQ((std::vector<uint8_t>{0x80, 34}), VT2.Before.Bytes);
EXPECT_EQ((std::vector<uint8_t>{0x81, 0xff}), VT2.Before.BytesUsed);
Targets[0].RetVal = 56;
Targets[1].RetVal = 78;
setBeforeReturnValues(Targets, 48, 16, OffsetByte, OffsetBit);
EXPECT_EQ(-8ll, OffsetByte);
EXPECT_EQ(0ull, OffsetBit);
EXPECT_EQ((std::vector<uint8_t>{1, 12, 0, 56}), VT1.Before.Bytes);
EXPECT_EQ((std::vector<uint8_t>{0x81, 0xff, 0xff, 0xff}),
VT1.Before.BytesUsed);
EXPECT_EQ((std::vector<uint8_t>{0x80, 34, 0, 78}), VT2.Before.Bytes);
EXPECT_EQ((std::vector<uint8_t>{0x81, 0xff, 0xff, 0xff}),
VT2.Before.BytesUsed);
Targets[0].RetVal = 1;
Targets[1].RetVal = 0;
setAfterReturnValues(Targets, 32, 1, OffsetByte, OffsetBit);
EXPECT_EQ(4ll, OffsetByte);
EXPECT_EQ(0ull, OffsetBit);
EXPECT_EQ(std::vector<uint8_t>{1}, VT1.After.Bytes);
EXPECT_EQ(std::vector<uint8_t>{1}, VT1.After.BytesUsed);
EXPECT_EQ(std::vector<uint8_t>{0}, VT2.After.Bytes);
EXPECT_EQ(std::vector<uint8_t>{1}, VT2.After.BytesUsed);
Targets[0].RetVal = 0;
Targets[1].RetVal = 1;
setAfterReturnValues(Targets, 39, 1, OffsetByte, OffsetBit);
EXPECT_EQ(4ll, OffsetByte);
EXPECT_EQ(7ull, OffsetBit);
EXPECT_EQ(std::vector<uint8_t>{1}, VT1.After.Bytes);
EXPECT_EQ(std::vector<uint8_t>{0x81}, VT1.After.BytesUsed);
EXPECT_EQ(std::vector<uint8_t>{0x80}, VT2.After.Bytes);
EXPECT_EQ(std::vector<uint8_t>{0x81}, VT2.After.BytesUsed);
Targets[0].RetVal = 12;
Targets[1].RetVal = 34;
setAfterReturnValues(Targets, 40, 8, OffsetByte, OffsetBit);
EXPECT_EQ(5ll, OffsetByte);
EXPECT_EQ(0ull, OffsetBit);
EXPECT_EQ((std::vector<uint8_t>{1, 12}), VT1.After.Bytes);
EXPECT_EQ((std::vector<uint8_t>{0x81, 0xff}), VT1.After.BytesUsed);
EXPECT_EQ((std::vector<uint8_t>{0x80, 34}), VT2.After.Bytes);
EXPECT_EQ((std::vector<uint8_t>{0x81, 0xff}), VT2.After.BytesUsed);
Targets[0].RetVal = 56;
Targets[1].RetVal = 78;
setAfterReturnValues(Targets, 48, 16, OffsetByte, OffsetBit);
EXPECT_EQ(6ll, OffsetByte);
EXPECT_EQ(0ull, OffsetBit);
EXPECT_EQ((std::vector<uint8_t>{1, 12, 56, 0}), VT1.After.Bytes);
EXPECT_EQ((std::vector<uint8_t>{0x81, 0xff, 0xff, 0xff}),
VT1.After.BytesUsed);
EXPECT_EQ((std::vector<uint8_t>{0x80, 34, 78, 0}), VT2.After.Bytes);
EXPECT_EQ((std::vector<uint8_t>{0x81, 0xff, 0xff, 0xff}),
VT2.After.BytesUsed);
}