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llvm-project/llvm/tools/sancov/sancov.cc

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//===-- sancov.cc --------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a command-line tool for reading and analyzing sanitizer
// coverage.
//===----------------------------------------------------------------------===//
#include "llvm/ADT/STLExtras.h"
#include "llvm/DebugInfo/Symbolize/Symbolize.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDisassembler/MCDisassembler.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCInstrAnalysis.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/Binary.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Errc.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/LineIterator.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/SpecialCaseList.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/raw_ostream.h"
#include <set>
#include <stdio.h>
#include <string>
#include <vector>
using namespace llvm;
namespace {
// --------- COMMAND LINE FLAGS ---------
enum ActionType {
PrintAction,
CoveredFunctionsAction,
NotCoveredFunctionsAction,
HtmlReportAction
};
cl::opt<ActionType> Action(
cl::desc("Action (required)"), cl::Required,
cl::values(clEnumValN(PrintAction, "print", "Print coverage addresses"),
clEnumValN(CoveredFunctionsAction, "covered-functions",
"Print all covered funcions."),
clEnumValN(NotCoveredFunctionsAction, "not-covered-functions",
"Print all not covered funcions."),
clEnumValN(HtmlReportAction, "html-report",
"Print HTML coverage report."),
clEnumValEnd));
static cl::list<std::string> ClInputFiles(cl::Positional, cl::OneOrMore,
cl::desc("<filenames...>"));
static cl::opt<std::string>
ClBinaryName("obj", cl::Required,
cl::desc("Path to object file to be symbolized"));
static cl::opt<bool>
ClDemangle("demangle", cl::init(true),
cl::desc("Print demangled function name."));
static cl::opt<std::string> ClStripPathPrefix(
"strip_path_prefix", cl::init(""),
cl::desc("Strip this prefix from file paths in reports."));
static cl::opt<std::string>
ClBlacklist("blacklist", cl::init(""),
cl::desc("Blacklist file (sanitizer blacklist format)."));
static cl::opt<bool> ClUseDefaultBlacklist(
"use_default_blacklist", cl::init(true), cl::Hidden,
cl::desc("Controls if default blacklist should be used."));
static const char *const DefaultBlacklist = "fun:__sanitizer_*";
// --------- FORMAT SPECIFICATION ---------
struct FileHeader {
uint32_t Bitness;
uint32_t Magic;
};
static const uint32_t BinCoverageMagic = 0xC0BFFFFF;
static const uint32_t Bitness32 = 0xFFFFFF32;
static const uint32_t Bitness64 = 0xFFFFFF64;
// ---------
static void FailIfError(std::error_code Error) {
if (!Error)
return;
errs() << "Error: " << Error.message() << "(" << Error.value() << ")\n";
exit(1);
}
template <typename T> static void FailIfError(const ErrorOr<T> &E) {
FailIfError(E.getError());
}
static void FailIfNotEmpty(const std::string &E) {
if (E.empty())
return;
errs() << "Error: " << E << "\n";
exit(1);
}
template <typename T>
static void FailIfEmpty(const std::unique_ptr<T> &Ptr,
const std::string &Message) {
if (Ptr.get())
return;
errs() << "Error: " << Message << "\n";
exit(1);
}
template <typename T>
static void readInts(const char *Start, const char *End,
std::set<uint64_t> *Ints) {
const T *S = reinterpret_cast<const T *>(Start);
const T *E = reinterpret_cast<const T *>(End);
std::copy(S, E, std::inserter(*Ints, Ints->end()));
}
struct FileLoc {
bool operator<(const FileLoc &RHS) const {
return std::tie(FileName, Line) < std::tie(RHS.FileName, RHS.Line);
}
std::string FileName;
uint32_t Line;
};
struct FunctionLoc {
bool operator<(const FunctionLoc &RHS) const {
return std::tie(Loc, FunctionName) < std::tie(RHS.Loc, RHS.FunctionName);
}
FileLoc Loc;
std::string FunctionName;
};
std::string stripPathPrefix(std::string Path) {
if (ClStripPathPrefix.empty())
return Path;
size_t Pos = Path.find(ClStripPathPrefix);
if (Pos == std::string::npos)
return Path;
return Path.substr(Pos + ClStripPathPrefix.size());
}
static std::unique_ptr<symbolize::LLVMSymbolizer> createSymbolizer() {
symbolize::LLVMSymbolizer::Options SymbolizerOptions;
SymbolizerOptions.Demangle = ClDemangle;
SymbolizerOptions.UseSymbolTable = true;
return std::unique_ptr<symbolize::LLVMSymbolizer>(
new symbolize::LLVMSymbolizer(SymbolizerOptions));
}
// Compute [FileLoc -> FunctionName] map for given addresses.
static std::map<FileLoc, std::string>
computeFunctionsMap(const std::set<uint64_t> &Addrs) {
std::map<FileLoc, std::string> Fns;
auto Symbolizer(createSymbolizer());
// Fill in Fns map.
for (auto Addr : Addrs) {
auto InliningInfo = Symbolizer->symbolizeInlinedCode(ClBinaryName, Addr);
FailIfError(InliningInfo);
for (uint32_t I = 0; I < InliningInfo->getNumberOfFrames(); ++I) {
auto FrameInfo = InliningInfo->getFrame(I);
SmallString<256> FileName(FrameInfo.FileName);
sys::path::remove_dots(FileName, /* remove_dot_dot */ true);
FileLoc Loc = {FileName.str(), FrameInfo.Line};
Fns[Loc] = FrameInfo.FunctionName;
}
}
return Fns;
}
// Compute functions for given addresses. It keeps only the first
// occurence of a function within a file.
std::set<FunctionLoc> computeFunctionLocs(const std::set<uint64_t> &Addrs) {
std::map<FileLoc, std::string> Fns = computeFunctionsMap(Addrs);
std::set<FunctionLoc> Result;
std::string LastFileName;
std::set<std::string> ProcessedFunctions;
for (const auto &P : Fns) {
std::string FileName = P.first.FileName;
std::string FunctionName = P.second;
if (LastFileName != FileName)
ProcessedFunctions.clear();
LastFileName = FileName;
if (!ProcessedFunctions.insert(FunctionName).second)
continue;
Result.insert(FunctionLoc{P.first, P.second});
}
return Result;
}
// Locate __sanitizer_cov* function addresses that are used for coverage
// reporting.
static std::set<uint64_t>
findSanitizerCovFunctions(const object::ObjectFile &O) {
std::set<uint64_t> Result;
for (const object::SymbolRef &Symbol : O.symbols()) {
ErrorOr<uint64_t> AddressOrErr = Symbol.getAddress();
FailIfError(AddressOrErr);
ErrorOr<StringRef> NameOrErr = Symbol.getName();
FailIfError(NameOrErr);
StringRef Name = NameOrErr.get();
if (Name == "__sanitizer_cov" || Name == "__sanitizer_cov_with_check" ||
Name == "__sanitizer_cov_trace_func_enter") {
Result.insert(AddressOrErr.get());
}
}
if (Result.empty())
FailIfNotEmpty("__sanitizer_cov* functions not found");
return Result;
}
// Locate addresses of all coverage points in a file. Coverage point
// is defined as the 'address of instruction following __sanitizer_cov
// call - 1'.
static void getObjectCoveragePoints(const object::ObjectFile &O,
std::set<uint64_t> *Addrs) {
Triple TheTriple("unknown-unknown-unknown");
TheTriple.setArch(Triple::ArchType(O.getArch()));
auto TripleName = TheTriple.getTriple();
std::string Error;
const Target *TheTarget = TargetRegistry::lookupTarget(TripleName, Error);
FailIfNotEmpty(Error);
std::unique_ptr<const MCSubtargetInfo> STI(
TheTarget->createMCSubtargetInfo(TripleName, "", ""));
FailIfEmpty(STI, "no subtarget info for target " + TripleName);
std::unique_ptr<const MCRegisterInfo> MRI(
TheTarget->createMCRegInfo(TripleName));
FailIfEmpty(MRI, "no register info for target " + TripleName);
std::unique_ptr<const MCAsmInfo> AsmInfo(
TheTarget->createMCAsmInfo(*MRI, TripleName));
FailIfEmpty(AsmInfo, "no asm info for target " + TripleName);
std::unique_ptr<const MCObjectFileInfo> MOFI(new MCObjectFileInfo);
MCContext Ctx(AsmInfo.get(), MRI.get(), MOFI.get());
std::unique_ptr<MCDisassembler> DisAsm(
TheTarget->createMCDisassembler(*STI, Ctx));
FailIfEmpty(DisAsm, "no disassembler info for target " + TripleName);
std::unique_ptr<const MCInstrInfo> MII(TheTarget->createMCInstrInfo());
FailIfEmpty(MII, "no instruction info for target " + TripleName);
std::unique_ptr<const MCInstrAnalysis> MIA(
TheTarget->createMCInstrAnalysis(MII.get()));
FailIfEmpty(MIA, "no instruction analysis info for target " + TripleName);
auto SanCovAddrs = findSanitizerCovFunctions(O);
for (const auto Section : O.sections()) {
if (Section.isVirtual() || !Section.isText()) // llvm-objdump does the same.
continue;
uint64_t SectionAddr = Section.getAddress();
uint64_t SectSize = Section.getSize();
if (!SectSize)
continue;
StringRef SectionName;
FailIfError(Section.getName(SectionName));
StringRef BytesStr;
FailIfError(Section.getContents(BytesStr));
ArrayRef<uint8_t> Bytes(reinterpret_cast<const uint8_t *>(BytesStr.data()),
BytesStr.size());
for (uint64_t Index = 0, Size = 0; Index < Section.getSize();
Index += Size) {
MCInst Inst;
if (!DisAsm->getInstruction(Inst, Size, Bytes.slice(Index),
SectionAddr + Index, nulls(), nulls())) {
if (Size == 0)
Size = 1;
continue;
}
uint64_t Target;
if (MIA->isCall(Inst) &&
MIA->evaluateBranch(Inst, SectionAddr + Index, Size, Target)) {
if (SanCovAddrs.find(Target) != SanCovAddrs.end()) {
// Sanitizer coverage uses the address of the next instruction - 1.
Addrs->insert(Index + SectionAddr + Size - 1);
}
}
}
}
}
static void getArchiveCoveragePoints(const object::Archive &A,
std::set<uint64_t> *Addrs) {
for (auto &ErrorOrChild : A.children()) {
FailIfError(ErrorOrChild);
const object::Archive::Child &C = *ErrorOrChild;
ErrorOr<std::unique_ptr<object::Binary>> ChildOrErr = C.getAsBinary();
FailIfError(ChildOrErr);
if (object::ObjectFile *O =
dyn_cast<object::ObjectFile>(&*ChildOrErr.get()))
getObjectCoveragePoints(*O, Addrs);
else
FailIfError(object::object_error::invalid_file_type);
}
}
// Locate addresses of all coverage points in a file. Coverage point
// is defined as the 'address of instruction following __sanitizer_cov
// call - 1'.
std::set<uint64_t> getCoveragePoints(std::string FileName) {
std::set<uint64_t> Result;
ErrorOr<object::OwningBinary<object::Binary>> BinaryOrErr =
object::createBinary(FileName);
FailIfError(BinaryOrErr);
object::Binary &Binary = *BinaryOrErr.get().getBinary();
if (object::Archive *A = dyn_cast<object::Archive>(&Binary))
getArchiveCoveragePoints(*A, &Result);
else if (object::ObjectFile *O = dyn_cast<object::ObjectFile>(&Binary))
getObjectCoveragePoints(*O, &Result);
else
FailIfError(object::object_error::invalid_file_type);
return Result;
}
static std::unique_ptr<SpecialCaseList> createDefaultBlacklist() {
if (!ClUseDefaultBlacklist)
return std::unique_ptr<SpecialCaseList>();
std::unique_ptr<MemoryBuffer> MB =
MemoryBuffer::getMemBuffer(DefaultBlacklist);
std::string Error;
auto Blacklist = SpecialCaseList::create(MB.get(), Error);
FailIfNotEmpty(Error);
return Blacklist;
}
static std::unique_ptr<SpecialCaseList> createUserBlacklist() {
if (ClBlacklist.empty())
return std::unique_ptr<SpecialCaseList>();
return SpecialCaseList::createOrDie({{ClBlacklist}});
}
static void printFunctionLocs(const std::set<FunctionLoc> &FnLocs,
raw_ostream &OS) {
std::unique_ptr<SpecialCaseList> DefaultBlacklist = createDefaultBlacklist();
std::unique_ptr<SpecialCaseList> UserBlacklist = createUserBlacklist();
for (const FunctionLoc &FnLoc : FnLocs) {
if (DefaultBlacklist &&
DefaultBlacklist->inSection("fun", FnLoc.FunctionName))
continue;
if (DefaultBlacklist &&
DefaultBlacklist->inSection("src", FnLoc.Loc.FileName))
continue;
if (UserBlacklist && UserBlacklist->inSection("fun", FnLoc.FunctionName))
continue;
if (UserBlacklist && UserBlacklist->inSection("src", FnLoc.Loc.FileName))
continue;
OS << stripPathPrefix(FnLoc.Loc.FileName) << ":" << FnLoc.Loc.Line << " "
<< FnLoc.FunctionName << "\n";
}
}
static std::string escapeHtml(const std::string &S) {
std::string Result;
Result.reserve(S.size());
for (char Ch : S) {
switch (Ch) {
case '&':
Result.append("&amp;");
break;
case '\'':
Result.append("&apos;");
break;
case '"':
Result.append("&quot;");
break;
case '<':
Result.append("&lt;");
break;
case '>':
Result.append("&gt;");
break;
default:
Result.push_back(Ch);
break;
}
}
return Result;
}
// Computes a map file_name->{line_number}
static std::map<std::string, std::set<int>>
getFileLines(const std::set<uint64_t> &Addrs) {
std::map<std::string, std::set<int>> FileLines;
auto Symbolizer(createSymbolizer());
// Fill in FileLines map.
for (auto Addr : Addrs) {
auto InliningInfo = Symbolizer->symbolizeInlinedCode(ClBinaryName, Addr);
FailIfError(InliningInfo);
for (uint32_t I = 0; I < InliningInfo->getNumberOfFrames(); ++I) {
auto FrameInfo = InliningInfo->getFrame(I);
SmallString<256> FileName(FrameInfo.FileName);
sys::path::remove_dots(FileName, /* remove_dot_dot */ true);
FileLines[FileName.str()].insert(FrameInfo.Line);
}
}
return FileLines;
}
class CoverageData {
public:
// Read single file coverage data.
static ErrorOr<std::unique_ptr<CoverageData>> read(std::string FileName) {
ErrorOr<std::unique_ptr<MemoryBuffer>> BufOrErr =
MemoryBuffer::getFile(FileName);
if (!BufOrErr)
return BufOrErr.getError();
std::unique_ptr<MemoryBuffer> Buf = std::move(BufOrErr.get());
if (Buf->getBufferSize() < 8) {
errs() << "File too small (<8): " << Buf->getBufferSize();
return make_error_code(errc::illegal_byte_sequence);
}
const FileHeader *Header =
reinterpret_cast<const FileHeader *>(Buf->getBufferStart());
if (Header->Magic != BinCoverageMagic) {
errs() << "Wrong magic: " << Header->Magic;
return make_error_code(errc::illegal_byte_sequence);
}
auto Addrs = llvm::make_unique<std::set<uint64_t>>();
switch (Header->Bitness) {
case Bitness64:
readInts<uint64_t>(Buf->getBufferStart() + 8, Buf->getBufferEnd(),
Addrs.get());
break;
case Bitness32:
readInts<uint32_t>(Buf->getBufferStart() + 8, Buf->getBufferEnd(),
Addrs.get());
break;
default:
errs() << "Unsupported bitness: " << Header->Bitness;
return make_error_code(errc::illegal_byte_sequence);
}
return std::unique_ptr<CoverageData>(new CoverageData(std::move(Addrs)));
}
// Merge multiple coverage data together.
static std::unique_ptr<CoverageData>
merge(const std::vector<std::unique_ptr<CoverageData>> &Covs) {
auto Addrs = llvm::make_unique<std::set<uint64_t>>();
for (const auto &Cov : Covs)
Addrs->insert(Cov->Addrs->begin(), Cov->Addrs->end());
return std::unique_ptr<CoverageData>(new CoverageData(std::move(Addrs)));
}
// Read list of files and merges their coverage info.
static ErrorOr<std::unique_ptr<CoverageData>>
readAndMerge(const std::vector<std::string> &FileNames) {
std::vector<std::unique_ptr<CoverageData>> Covs;
for (const auto &FileName : FileNames) {
auto Cov = read(FileName);
if (!Cov)
return Cov.getError();
Covs.push_back(std::move(Cov.get()));
}
return merge(Covs);
}
// Print coverage addresses.
void printAddrs(raw_ostream &OS) {
for (auto Addr : *Addrs) {
OS << "0x";
OS.write_hex(Addr);
OS << "\n";
}
}
void printReport(raw_ostream &OS) {
// file_name -> set of covered lines;
std::map<std::string, std::set<int>> CoveredFileLines =
getFileLines(*Addrs);
std::map<std::string, std::set<int>> CoveragePoints =
getFileLines(getCoveragePoints(ClBinaryName));
std::string Title = stripPathPrefix(ClBinaryName) + " Coverage Report";
OS << "<html>\n";
OS << "<head>\n";
// Stylesheet
OS << "<style>\n";
OS << ".covered { background: #7F7; }\n";
OS << ".notcovered { background: #F77; }\n";
OS << "</style>\n";
OS << "<title>" << Title << "</title>\n";
OS << "</head>\n";
OS << "<body>\n";
// Title
OS << "<h1>" << Title << "</h1>\n";
OS << "<p>Coverage files: ";
for (auto InputFile : ClInputFiles) {
llvm::sys::fs::file_status Status;
llvm::sys::fs::status(InputFile, Status);
OS << stripPathPrefix(InputFile) << " ("
<< Status.getLastModificationTime().str() << ")";
}
OS << "</p>\n";
// TOC
OS << "<ul>\n";
for (auto It : CoveredFileLines) {
auto FileName = It.first;
OS << "<li><a href=\"#" << escapeHtml(FileName) << "\">"
<< stripPathPrefix(FileName) << "</a></li>\n";
}
OS << "</ul>\n";
// Source
for (auto It : CoveredFileLines) {
auto FileName = It.first;
auto Lines = It.second;
auto CovLines = CoveragePoints[FileName];
OS << "<a name=\"" << escapeHtml(FileName) << "\"> </a>\n";
OS << "<h2>" << stripPathPrefix(FileName) << "</h2>\n";
ErrorOr<std::unique_ptr<MemoryBuffer>> BufOrErr =
MemoryBuffer::getFile(FileName);
if (!BufOrErr) {
OS << "Error reading file: " << FileName << " : "
<< BufOrErr.getError().message() << "("
<< BufOrErr.getError().value() << ")\n";
continue;
}
OS << "<pre>\n";
for (line_iterator I = line_iterator(*BufOrErr.get(), false);
!I.is_at_eof(); ++I) {
OS << "<span ";
if (Lines.find(I.line_number()) != Lines.end())
OS << "class=covered";
else if (CovLines.find(I.line_number()) != CovLines.end())
OS << "class=notcovered";
OS << ">";
OS << escapeHtml(*I) << "</span>\n";
}
OS << "</pre>\n";
}
OS << "</body>\n";
OS << "</html>\n";
}
// Print list of covered functions.
// Line format: <file_name>:<line> <function_name>
void printCoveredFunctions(raw_ostream &OS) {
printFunctionLocs(computeFunctionLocs(*Addrs), OS);
}
// Print list of not covered functions.
// Line format: <file_name>:<line> <function_name>
void printNotCoveredFunctions(raw_ostream &OS) {
std::set<FunctionLoc> AllFns =
computeFunctionLocs(getCoveragePoints(ClBinaryName));
std::set<FunctionLoc> CoveredFns = computeFunctionLocs(*Addrs);
std::set<FunctionLoc> NotCoveredFns;
std::set_difference(AllFns.begin(), AllFns.end(), CoveredFns.begin(),
CoveredFns.end(),
std::inserter(NotCoveredFns, NotCoveredFns.end()));
printFunctionLocs(NotCoveredFns, OS);
}
private:
explicit CoverageData(std::unique_ptr<std::set<uint64_t>> Addrs)
: Addrs(std::move(Addrs)) {}
std::unique_ptr<std::set<uint64_t>> Addrs;
};
} // namespace
int main(int argc, char **argv) {
// Print stack trace if we signal out.
sys::PrintStackTraceOnErrorSignal();
PrettyStackTraceProgram X(argc, argv);
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllDisassemblers();
cl::ParseCommandLineOptions(argc, argv, "Sanitizer Coverage Processing Tool");
auto CovData = CoverageData::readAndMerge(ClInputFiles);
FailIfError(CovData);
switch (Action) {
case PrintAction: {
CovData.get()->printAddrs(outs());
return 0;
}
case CoveredFunctionsAction: {
CovData.get()->printCoveredFunctions(outs());
return 0;
}
case NotCoveredFunctionsAction: {
CovData.get()->printNotCoveredFunctions(outs());
return 0;
}
case HtmlReportAction: {
CovData.get()->printReport(outs());
return 0;
}
}
llvm_unreachable("unsupported action");
}
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