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//===- unittests/Lex/HeaderMapTest.cpp - HeaderMap 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 "HeaderMapTestUtils.h"
#include "llvm/ADT/SmallString.h"
#include "gtest/gtest.h"
#include <type_traits>
using namespace clang;
using namespace llvm;
using namespace clang::test;
namespace {
TEST(HeaderMapTest, checkHeaderEmpty) {
bool NeedsSwap;
ASSERT_FALSE(HeaderMapImpl::checkHeader(
*MemoryBuffer::getMemBufferCopy("", "empty"), NeedsSwap));
ASSERT_FALSE(HeaderMapImpl::checkHeader(
*MemoryBuffer::getMemBufferCopy("", "empty"), NeedsSwap));
}
TEST(HeaderMapTest, checkHeaderMagic) {
HMapFileMock<1, 1> File;
File.init();
File.Header.Magic = 0;
bool NeedsSwap;
ASSERT_FALSE(HeaderMapImpl::checkHeader(*File.getBuffer(), NeedsSwap));
}
TEST(HeaderMapTest, checkHeaderReserved) {
HMapFileMock<1, 1> File;
File.init();
File.Header.Reserved = 1;
bool NeedsSwap;
ASSERT_FALSE(HeaderMapImpl::checkHeader(*File.getBuffer(), NeedsSwap));
}
TEST(HeaderMapTest, checkHeaderVersion) {
HMapFileMock<1, 1> File;
File.init();
++File.Header.Version;
bool NeedsSwap;
ASSERT_FALSE(HeaderMapImpl::checkHeader(*File.getBuffer(), NeedsSwap));
}
TEST(HeaderMapTest, checkHeaderValidButEmpty) {
HMapFileMock<1, 1> File;
File.init();
bool NeedsSwap;
ASSERT_TRUE(HeaderMapImpl::checkHeader(*File.getBuffer(), NeedsSwap));
ASSERT_FALSE(NeedsSwap);
File.swapBytes();
ASSERT_TRUE(HeaderMapImpl::checkHeader(*File.getBuffer(), NeedsSwap));
ASSERT_TRUE(NeedsSwap);
}
TEST(HeaderMapTest, checkHeader3Buckets) {
HMapFileMock<3, 1> File;
ASSERT_EQ(3 * sizeof(HMapBucket), sizeof(File.Buckets));
File.init();
bool NeedsSwap;
ASSERT_FALSE(HeaderMapImpl::checkHeader(*File.getBuffer(), NeedsSwap));
}
TEST(HeaderMapTest, checkHeader0Buckets) {
// Create with 1 bucket to avoid 0-sized arrays.
HMapFileMock<1, 1> File;
File.init();
File.Header.NumBuckets = 0;
bool NeedsSwap;
ASSERT_FALSE(HeaderMapImpl::checkHeader(*File.getBuffer(), NeedsSwap));
}
TEST(HeaderMapTest, checkHeaderNotEnoughBuckets) {
HMapFileMock<1, 1> File;
File.init();
File.Header.NumBuckets = 8;
bool NeedsSwap;
ASSERT_FALSE(HeaderMapImpl::checkHeader(*File.getBuffer(), NeedsSwap));
}
TEST(HeaderMapTest, lookupFilename) {
typedef HMapFileMock<2, 7> FileTy;
FileTy File;
File.init();
HMapFileMockMaker<FileTy> Maker(File);
auto a = Maker.addString("a");
auto b = Maker.addString("b");
auto c = Maker.addString("c");
Maker.addBucket("a", a, b, c);
bool NeedsSwap;
ASSERT_TRUE(HeaderMapImpl::checkHeader(*File.getBuffer(), NeedsSwap));
ASSERT_FALSE(NeedsSwap);
HeaderMapImpl Map(File.getBuffer(), NeedsSwap);
SmallString<8> DestPath;
ASSERT_EQ("bc", Map.lookupFilename("a", DestPath));
}
template <class FileTy, class PaddingTy> struct PaddedFile {
FileTy File;
PaddingTy Padding;
};
TEST(HeaderMapTest, lookupFilenameTruncatedSuffix) {
typedef HMapFileMock<2, 64 - sizeof(HMapHeader) - 2 * sizeof(HMapBucket)>
FileTy;
static_assert(std::is_standard_layout_v<FileTy>, "Expected standard layout");
static_assert(sizeof(FileTy) == 64, "check the math");
PaddedFile<FileTy, uint64_t> P;
auto &File = P.File;
auto &Padding = P.Padding;
File.init();
HMapFileMockMaker<FileTy> Maker(File);
auto a = Maker.addString("a");
auto b = Maker.addString("b");
auto c = Maker.addString("c");
Maker.addBucket("a", a, b, c);
// Add 'x' characters to cause an overflow into Padding.
ASSERT_EQ('c', File.Bytes[5]);
for (unsigned I = 6; I < sizeof(File.Bytes); ++I) {
ASSERT_EQ(0, File.Bytes[I]);
File.Bytes[I] = 'x';
}
Padding = 0xffffffff; // Padding won't stop it either.
bool NeedsSwap;
ASSERT_TRUE(HeaderMapImpl::checkHeader(*File.getBuffer(), NeedsSwap));
ASSERT_FALSE(NeedsSwap);
HeaderMapImpl Map(File.getBuffer(), NeedsSwap);
// The string for "c" runs to the end of File. Check that the suffix
// ("cxxxx...") is detected as truncated, and an empty string is returned.
SmallString<24> DestPath;
ASSERT_EQ("", Map.lookupFilename("a", DestPath));
}
TEST(HeaderMapTest, lookupFilenameTruncatedPrefix) {
typedef HMapFileMock<2, 64 - sizeof(HMapHeader) - 2 * sizeof(HMapBucket)>
FileTy;
static_assert(std::is_standard_layout_v<FileTy>, "Expected standard layout");
static_assert(sizeof(FileTy) == 64, "check the math");
PaddedFile<FileTy, uint64_t> P;
auto &File = P.File;
auto &Padding = P.Padding;
File.init();
HMapFileMockMaker<FileTy> Maker(File);
auto a = Maker.addString("a");
auto c = Maker.addString("c");
auto b = Maker.addString("b"); // Store the prefix last.
Maker.addBucket("a", a, b, c);
// Add 'x' characters to cause an overflow into Padding.
ASSERT_EQ('b', File.Bytes[5]);
for (unsigned I = 6; I < sizeof(File.Bytes); ++I) {
ASSERT_EQ(0, File.Bytes[I]);
File.Bytes[I] = 'x';
}
Padding = 0xffffffff; // Padding won't stop it either.
bool NeedsSwap;
ASSERT_TRUE(HeaderMapImpl::checkHeader(*File.getBuffer(), NeedsSwap));
ASSERT_FALSE(NeedsSwap);
HeaderMapImpl Map(File.getBuffer(), NeedsSwap);
// The string for "b" runs to the end of File. Check that the prefix
// ("bxxxx...") is detected as truncated, and an empty string is returned.
SmallString<24> DestPath;
ASSERT_EQ("", Map.lookupFilename("a", DestPath));
}
} // end namespace
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