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//===-- LVReaderHandler.cpp -----------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This class implements the Reader Handler.
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/LogicalView/LVReaderHandler.h"
#include "llvm/DebugInfo/LogicalView/Core/LVCompare.h"
#include "llvm/DebugInfo/LogicalView/Readers/LVELFReader.h"
using namespace llvm;
using namespace llvm::object;
using namespace llvm::pdb;
using namespace llvm::logicalview;
#define DEBUG_TYPE "ReaderHandler"
Error LVReaderHandler::process() {
if (Error Err = createReaders())
return Err;
if (Error Err = printReaders())
return Err;
if (Error Err = compareReaders())
return Err;
return Error::success();
}
void LVReaderHandler::destroyReaders() {
LLVM_DEBUG(dbgs() << "destroyReaders\n");
for (const LVReader *Reader : TheReaders)
delete Reader;
}
Error LVReaderHandler::createReader(StringRef Filename, LVReaders &Readers,
PdbOrObj &Input, StringRef FileFormatName,
StringRef ExePath) {
auto CreateOneReader = [&]() -> LVReader * {
if (Input.is<ObjectFile *>()) {
ObjectFile &Obj = *Input.get<ObjectFile *>();
if (Obj.isELF() || Obj.isMachO())
return new LVELFReader(Filename, FileFormatName, Obj, W);
}
return nullptr;
};
LVReader *Reader = CreateOneReader();
if (!Reader)
return createStringError(errc::invalid_argument,
"unable to create reader for: '%s'",
Filename.str().c_str());
Readers.push_back(Reader);
return Reader->doLoad();
}
Error LVReaderHandler::handleArchive(LVReaders &Readers, StringRef Filename,
Archive &Arch) {
Error Err = Error::success();
for (const Archive::Child &Child : Arch.children(Err)) {
Expected<MemoryBufferRef> BuffOrErr = Child.getMemoryBufferRef();
if (Error Err = BuffOrErr.takeError())
return createStringError(errorToErrorCode(std::move(Err)), "%s",
Filename.str().c_str());
Expected<StringRef> NameOrErr = Child.getName();
if (Error Err = NameOrErr.takeError())
return createStringError(errorToErrorCode(std::move(Err)), "%s",
Filename.str().c_str());
std::string Name = (Filename + "(" + NameOrErr.get() + ")").str();
if (Error Err = handleBuffer(Readers, Name, BuffOrErr.get()))
return createStringError(errorToErrorCode(std::move(Err)), "%s",
Filename.str().c_str());
}
return Error::success();
}
Error LVReaderHandler::handleBuffer(LVReaders &Readers, StringRef Filename,
MemoryBufferRef Buffer, StringRef ExePath) {
Expected<std::unique_ptr<Binary>> BinOrErr = createBinary(Buffer);
if (errorToErrorCode(BinOrErr.takeError())) {
return createStringError(errc::not_supported,
"Binary object format in '%s' is not supported.",
Filename.str().c_str());
}
return handleObject(Readers, Filename, *BinOrErr.get());
}
Error LVReaderHandler::handleFile(LVReaders &Readers, StringRef Filename,
StringRef ExePath) {
// Convert any Windows backslashes into forward slashes to get the path.
std::string ConvertedPath =
sys::path::convert_to_slash(Filename, sys::path::Style::windows);
ErrorOr<std::unique_ptr<MemoryBuffer>> BuffOrErr =
MemoryBuffer::getFileOrSTDIN(ConvertedPath);
if (BuffOrErr.getError()) {
return createStringError(errc::bad_file_descriptor,
"File '%s' does not exist.",
ConvertedPath.c_str());
}
std::unique_ptr<MemoryBuffer> Buffer = std::move(BuffOrErr.get());
return handleBuffer(Readers, ConvertedPath, *Buffer, ExePath);
}
Error LVReaderHandler::handleMach(LVReaders &Readers, StringRef Filename,
MachOUniversalBinary &Mach) {
for (const MachOUniversalBinary::ObjectForArch &ObjForArch : Mach.objects()) {
std::string ObjName = (Twine(Filename) + Twine("(") +
Twine(ObjForArch.getArchFlagName()) + Twine(")"))
.str();
if (Expected<std::unique_ptr<MachOObjectFile>> MachOOrErr =
ObjForArch.getAsObjectFile()) {
MachOObjectFile &Obj = **MachOOrErr;
PdbOrObj Input = &Obj;
if (Error Err =
createReader(Filename, Readers, Input, Obj.getFileFormatName()))
return Err;
continue;
} else
consumeError(MachOOrErr.takeError());
if (Expected<std::unique_ptr<Archive>> ArchiveOrErr =
ObjForArch.getAsArchive()) {
if (Error Err = handleArchive(Readers, ObjName, *ArchiveOrErr.get()))
return Err;
continue;
} else
consumeError(ArchiveOrErr.takeError());
}
return Error::success();
}
Error LVReaderHandler::handleObject(LVReaders &Readers, StringRef Filename,
Binary &Binary) {
if (PdbOrObj Input = dyn_cast<ObjectFile>(&Binary))
return createReader(Filename, Readers, Input,
Input.get<ObjectFile *>()->getFileFormatName());
if (MachOUniversalBinary *Fat = dyn_cast<MachOUniversalBinary>(&Binary))
return handleMach(Readers, Filename, *Fat);
if (Archive *Arch = dyn_cast<Archive>(&Binary))
return handleArchive(Readers, Filename, *Arch);
return createStringError(errc::not_supported,
"Binary object format in '%s' is not supported.",
Filename.str().c_str());
}
Error LVReaderHandler::createReaders() {
LLVM_DEBUG(dbgs() << "createReaders\n");
for (std::string &Object : Objects) {
LVReaders Readers;
if (Error Err = createReader(Object, Readers))
return Err;
TheReaders.insert(TheReaders.end(), Readers.begin(), Readers.end());
}
return Error::success();
}
Error LVReaderHandler::printReaders() {
LLVM_DEBUG(dbgs() << "printReaders\n");
if (options().getPrintExecute())
for (LVReader *Reader : TheReaders)
if (Error Err = Reader->doPrint())
return Err;
return Error::success();
}
Error LVReaderHandler::compareReaders() {
LLVM_DEBUG(dbgs() << "compareReaders\n");
size_t ReadersCount = TheReaders.size();
if (options().getCompareExecute() && ReadersCount >= 2) {
// If we have more than 2 readers, compare them by pairs.
size_t ViewPairs = ReadersCount / 2;
LVCompare Compare(OS);
for (size_t Pair = 0, Index = 0; Pair < ViewPairs; ++Pair) {
if (Error Err = Compare.execute(TheReaders[Index], TheReaders[Index + 1]))
return Err;
Index += 2;
}
}
return Error::success();
}
void LVReaderHandler::print(raw_ostream &OS) const { OS << "ReaderHandler\n"; }
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