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//===- unittests/Lex/HeaderMapTest.cpp - HeaderMap tests ----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===--------------------------------------------------------------===//
#include "clang/Basic/CharInfo.h"
#include "clang/Lex/HeaderMap.h"
#include "clang/Lex/HeaderMapTypes.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/SwapByteOrder.h"
#include "gtest/gtest.h"
#include <cassert>
#include <type_traits>
using namespace clang;
using namespace llvm;
namespace {
// Lay out a header file for testing.
template <unsigned NumBuckets, unsigned NumBytes> struct MapFile {
HMapHeader Header;
HMapBucket Buckets[NumBuckets];
unsigned char Bytes[NumBytes];
void init() {
memset(this, 0, sizeof(MapFile));
Header.Magic = HMAP_HeaderMagicNumber;
Header.Version = HMAP_HeaderVersion;
Header.NumBuckets = NumBuckets;
Header.StringsOffset = sizeof(Header) + sizeof(Buckets);
}
void swapBytes() {
using llvm::sys::getSwappedBytes;
Header.Magic = getSwappedBytes(Header.Magic);
Header.Version = getSwappedBytes(Header.Version);
Header.NumBuckets = getSwappedBytes(Header.NumBuckets);
Header.StringsOffset = getSwappedBytes(Header.StringsOffset);
}
std::unique_ptr<const MemoryBuffer> getBuffer() const {
return MemoryBuffer::getMemBuffer(
StringRef(reinterpret_cast<const char *>(this), sizeof(MapFile)),
"header",
/* RequresNullTerminator */ false);
}
};
// The header map hash function.
static inline unsigned getHash(StringRef Str) {
unsigned Result = 0;
for (char C : Str)
Result += toLowercase(C) * 13;
return Result;
}
template <class FileTy> struct FileMaker {
FileTy &File;
unsigned SI = 1;
unsigned BI = 0;
FileMaker(FileTy &File) : File(File) {}
unsigned addString(StringRef S) {
assert(SI + S.size() + 1 <= sizeof(File.Bytes));
std::copy(S.begin(), S.end(), File.Bytes + SI);
auto OldSI = SI;
SI += S.size() + 1;
return OldSI;
}
void addBucket(unsigned Hash, unsigned Key, unsigned Prefix, unsigned Suffix) {
assert(!(File.Header.NumBuckets & (File.Header.NumBuckets - 1)));
unsigned I = Hash & (File.Header.NumBuckets - 1);
do {
if (!File.Buckets[I].Key) {
File.Buckets[I].Key = Key;
File.Buckets[I].Prefix = Prefix;
File.Buckets[I].Suffix = Suffix;
++File.Header.NumEntries;
return;
}
++I;
I &= File.Header.NumBuckets - 1;
} while (I != (Hash & (File.Header.NumBuckets - 1)));
llvm_unreachable("no empty buckets");
}
};
TEST(HeaderMapTest, checkHeaderEmpty) {
bool NeedsSwap;
ASSERT_FALSE(HeaderMapImpl::checkHeader(
*MemoryBuffer::getMemBufferCopy("", "empty"), NeedsSwap));
ASSERT_FALSE(HeaderMapImpl::checkHeader(
*MemoryBuffer::getMemBufferCopy("", "empty"), NeedsSwap));
}
TEST(HeaderMapTest, checkHeaderMagic) {
MapFile<1, 1> File;
File.init();
File.Header.Magic = 0;
bool NeedsSwap;
ASSERT_FALSE(HeaderMapImpl::checkHeader(*File.getBuffer(), NeedsSwap));
}
TEST(HeaderMapTest, checkHeaderReserved) {
MapFile<1, 1> File;
File.init();
File.Header.Reserved = 1;
bool NeedsSwap;
ASSERT_FALSE(HeaderMapImpl::checkHeader(*File.getBuffer(), NeedsSwap));
}
TEST(HeaderMapTest, checkHeaderVersion) {
MapFile<1, 1> File;
File.init();
++File.Header.Version;
bool NeedsSwap;
ASSERT_FALSE(HeaderMapImpl::checkHeader(*File.getBuffer(), NeedsSwap));
}
TEST(HeaderMapTest, checkHeaderValidButEmpty) {
MapFile<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) {
MapFile<3, 1> File;
ASSERT_EQ(3 * sizeof(HMapBucket), sizeof(File.Buckets));
File.init();
bool NeedsSwap;
ASSERT_FALSE(HeaderMapImpl::checkHeader(*File.getBuffer(), NeedsSwap));
}
TEST(HeaderMapTest, checkHeaderNotEnoughBuckets) {
MapFile<1, 1> File;
File.init();
File.Header.NumBuckets = 8;
bool NeedsSwap;
ASSERT_FALSE(HeaderMapImpl::checkHeader(*File.getBuffer(), NeedsSwap));
}
TEST(HeaderMapTest, lookupFilename) {
typedef MapFile<2, 7> FileTy;
FileTy File;
File.init();
FileMaker<FileTy> Maker(File);
auto a = Maker.addString("a");
auto b = Maker.addString("b");
auto c = Maker.addString("c");
Maker.addBucket(getHash("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, lookupFilenameTruncated) {
typedef MapFile<2, 64 - sizeof(HMapHeader) - 2 * sizeof(HMapBucket)> FileTy;
static_assert(std::is_standard_layout<FileTy>::value,
"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();
FileMaker<FileTy> Maker(File);
auto a = Maker.addString("a");
auto b = Maker.addString("b");
auto c = Maker.addString("c");
Maker.addBucket(getHash("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 ignored. Another option would be to return an empty
// filename altogether.
SmallString<24> DestPath;
ASSERT_EQ("b", Map.lookupFilename("a", DestPath));
}
} // end namespace
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