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llvm-project/clang/lib/Driver/OffloadBundler.cpp

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//===- OffloadBundler.cpp - File Bundling and Unbundling ------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file implements an offload bundling API that bundles different files
/// that relate with the same source code but different targets into a single
/// one. Also the implements the opposite functionality, i.e. unbundle files
/// previous created by this API.
///
//===----------------------------------------------------------------------===//
#include "clang/Driver/OffloadBundler.h"
#include "clang/Basic/Cuda.h"
#include "clang/Basic/TargetID.h"
#include "clang/Basic/Version.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/ArchiveWriter.h"
#include "llvm/Object/Binary.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Errc.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Program.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/StringSaver.h"
#include "llvm/Support/WithColor.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
#include <cstddef>
#include <cstdint>
#include <forward_list>
#include <memory>
#include <set>
#include <string>
#include <system_error>
#include <utility>
using namespace llvm;
using namespace llvm::object;
using namespace clang;
/// Magic string that marks the existence of offloading data.
#define OFFLOAD_BUNDLER_MAGIC_STR "__CLANG_OFFLOAD_BUNDLE__"
OffloadTargetInfo::OffloadTargetInfo(const StringRef Target,
const OffloadBundlerConfig &BC)
: BundlerConfig(BC) {
// TODO: Add error checking from ClangOffloadBundler.cpp
auto TargetFeatures = Target.split(':');
auto TripleOrGPU = TargetFeatures.first.rsplit('-');
if (clang::StringToCudaArch(TripleOrGPU.second) != clang::CudaArch::UNKNOWN) {
auto KindTriple = TripleOrGPU.first.split('-');
this->OffloadKind = KindTriple.first;
this->Triple = llvm::Triple(KindTriple.second);
this->TargetID = Target.substr(Target.find(TripleOrGPU.second));
} else {
auto KindTriple = TargetFeatures.first.split('-');
this->OffloadKind = KindTriple.first;
this->Triple = llvm::Triple(KindTriple.second);
this->TargetID = "";
}
}
bool OffloadTargetInfo::hasHostKind() const {
return this->OffloadKind == "host";
}
bool OffloadTargetInfo::isOffloadKindValid() const {
return OffloadKind == "host" || OffloadKind == "openmp" ||
OffloadKind == "hip" || OffloadKind == "hipv4";
}
bool OffloadTargetInfo::isOffloadKindCompatible(
const StringRef TargetOffloadKind) const {
if (OffloadKind == TargetOffloadKind)
return true;
if (BundlerConfig.HipOpenmpCompatible) {
bool HIPCompatibleWithOpenMP = OffloadKind.startswith_insensitive("hip") &&
TargetOffloadKind == "openmp";
bool OpenMPCompatibleWithHIP =
OffloadKind == "openmp" &&
TargetOffloadKind.startswith_insensitive("hip");
return HIPCompatibleWithOpenMP || OpenMPCompatibleWithHIP;
}
return false;
}
bool OffloadTargetInfo::isTripleValid() const {
return !Triple.str().empty() && Triple.getArch() != Triple::UnknownArch;
}
bool OffloadTargetInfo::operator==(const OffloadTargetInfo &Target) const {
return OffloadKind == Target.OffloadKind &&
Triple.isCompatibleWith(Target.Triple) && TargetID == Target.TargetID;
}
std::string OffloadTargetInfo::str() const {
return Twine(OffloadKind + "-" + Triple.str() + "-" + TargetID).str();
}
static StringRef getDeviceFileExtension(StringRef Device,
StringRef BundleFileName) {
if (Device.contains("gfx"))
return ".bc";
if (Device.contains("sm_"))
return ".cubin";
return sys::path::extension(BundleFileName);
}
static std::string getDeviceLibraryFileName(StringRef BundleFileName,
StringRef Device) {
StringRef LibName = sys::path::stem(BundleFileName);
StringRef Extension = getDeviceFileExtension(Device, BundleFileName);
std::string Result;
Result += LibName;
Result += Extension;
return Result;
}
/// @brief Checks if a code object \p CodeObjectInfo is compatible with a given
/// target \p TargetInfo.
/// @link https://clang.llvm.org/docs/ClangOffloadBundler.html#bundle-entry-id
bool isCodeObjectCompatible(const OffloadTargetInfo &CodeObjectInfo,
const OffloadTargetInfo &TargetInfo) {
// Compatible in case of exact match.
if (CodeObjectInfo == TargetInfo) {
DEBUG_WITH_TYPE("CodeObjectCompatibility",
dbgs() << "Compatible: Exact match: \t[CodeObject: "
<< CodeObjectInfo.str()
<< "]\t:\t[Target: " << TargetInfo.str() << "]\n");
return true;
}
// Incompatible if Kinds or Triples mismatch.
if (!CodeObjectInfo.isOffloadKindCompatible(TargetInfo.OffloadKind) ||
!CodeObjectInfo.Triple.isCompatibleWith(TargetInfo.Triple)) {
DEBUG_WITH_TYPE(
"CodeObjectCompatibility",
dbgs() << "Incompatible: Kind/Triple mismatch \t[CodeObject: "
<< CodeObjectInfo.str() << "]\t:\t[Target: " << TargetInfo.str()
<< "]\n");
return false;
}
// Incompatible if target IDs are incompatible.
if (!clang::isCompatibleTargetID(CodeObjectInfo.TargetID,
TargetInfo.TargetID)) {
DEBUG_WITH_TYPE(
"CodeObjectCompatibility",
dbgs() << "Incompatible: target IDs are incompatible \t[CodeObject: "
<< CodeObjectInfo.str() << "]\t:\t[Target: " << TargetInfo.str()
<< "]\n");
return false;
}
DEBUG_WITH_TYPE(
"CodeObjectCompatibility",
dbgs() << "Compatible: Code Objects are compatible \t[CodeObject: "
<< CodeObjectInfo.str() << "]\t:\t[Target: " << TargetInfo.str()
<< "]\n");
return true;
}
/// Generic file handler interface.
class FileHandler {
public:
struct BundleInfo {
StringRef BundleID;
};
FileHandler() {}
virtual ~FileHandler() {}
/// Update the file handler with information from the header of the bundled
/// file.
virtual Error ReadHeader(MemoryBuffer &Input) = 0;
/// Read the marker of the next bundled to be read in the file. The bundle
/// name is returned if there is one in the file, or `None` if there are no
/// more bundles to be read.
virtual Expected<Optional<StringRef>>
ReadBundleStart(MemoryBuffer &Input) = 0;
/// Read the marker that closes the current bundle.
virtual Error ReadBundleEnd(MemoryBuffer &Input) = 0;
/// Read the current bundle and write the result into the stream \a OS.
virtual Error ReadBundle(raw_ostream &OS, MemoryBuffer &Input) = 0;
/// Write the header of the bundled file to \a OS based on the information
/// gathered from \a Inputs.
virtual Error WriteHeader(raw_fd_ostream &OS,
ArrayRef<std::unique_ptr<MemoryBuffer>> Inputs) = 0;
/// Write the marker that initiates a bundle for the triple \a TargetTriple to
/// \a OS.
virtual Error WriteBundleStart(raw_fd_ostream &OS,
StringRef TargetTriple) = 0;
/// Write the marker that closes a bundle for the triple \a TargetTriple to \a
/// OS.
virtual Error WriteBundleEnd(raw_fd_ostream &OS, StringRef TargetTriple) = 0;
/// Write the bundle from \a Input into \a OS.
virtual Error WriteBundle(raw_fd_ostream &OS, MemoryBuffer &Input) = 0;
/// List bundle IDs in \a Input.
virtual Error listBundleIDs(MemoryBuffer &Input) {
if (Error Err = ReadHeader(Input))
return Err;
return forEachBundle(Input, [&](const BundleInfo &Info) -> Error {
llvm::outs() << Info.BundleID << '\n';
Error Err = listBundleIDsCallback(Input, Info);
if (Err)
return Err;
return Error::success();
});
}
/// For each bundle in \a Input, do \a Func.
Error forEachBundle(MemoryBuffer &Input,
std::function<Error(const BundleInfo &)> Func) {
while (true) {
Expected<Optional<StringRef>> CurTripleOrErr = ReadBundleStart(Input);
if (!CurTripleOrErr)
return CurTripleOrErr.takeError();
// No more bundles.
if (!*CurTripleOrErr)
break;
StringRef CurTriple = **CurTripleOrErr;
assert(!CurTriple.empty());
BundleInfo Info{CurTriple};
if (Error Err = Func(Info))
return Err;
}
return Error::success();
}
protected:
virtual Error listBundleIDsCallback(MemoryBuffer &Input,
const BundleInfo &Info) {
return Error::success();
}
};
/// Handler for binary files. The bundled file will have the following format
/// (all integers are stored in little-endian format):
///
/// "OFFLOAD_BUNDLER_MAGIC_STR" (ASCII encoding of the string)
///
/// NumberOfOffloadBundles (8-byte integer)
///
/// OffsetOfBundle1 (8-byte integer)
/// SizeOfBundle1 (8-byte integer)
/// NumberOfBytesInTripleOfBundle1 (8-byte integer)
/// TripleOfBundle1 (byte length defined before)
///
/// ...
///
/// OffsetOfBundleN (8-byte integer)
/// SizeOfBundleN (8-byte integer)
/// NumberOfBytesInTripleOfBundleN (8-byte integer)
/// TripleOfBundleN (byte length defined before)
///
/// Bundle1
/// ...
/// BundleN
/// Read 8-byte integers from a buffer in little-endian format.
static uint64_t Read8byteIntegerFromBuffer(StringRef Buffer, size_t pos) {
uint64_t Res = 0;
const char *Data = Buffer.data();
for (unsigned i = 0; i < 8; ++i) {
Res <<= 8;
uint64_t Char = (uint64_t)Data[pos + 7 - i];
Res |= 0xffu & Char;
}
return Res;
}
/// Write 8-byte integers to a buffer in little-endian format.
static void Write8byteIntegerToBuffer(raw_fd_ostream &OS, uint64_t Val) {
for (unsigned i = 0; i < 8; ++i) {
char Char = (char)(Val & 0xffu);
OS.write(&Char, 1);
Val >>= 8;
}
}
class BinaryFileHandler final : public FileHandler {
/// Information about the bundles extracted from the header.
struct BinaryBundleInfo final : public BundleInfo {
/// Size of the bundle.
uint64_t Size = 0u;
/// Offset at which the bundle starts in the bundled file.
uint64_t Offset = 0u;
BinaryBundleInfo() {}
BinaryBundleInfo(uint64_t Size, uint64_t Offset)
: Size(Size), Offset(Offset) {}
};
/// Map between a triple and the corresponding bundle information.
StringMap<BinaryBundleInfo> BundlesInfo;
/// Iterator for the bundle information that is being read.
StringMap<BinaryBundleInfo>::iterator CurBundleInfo;
StringMap<BinaryBundleInfo>::iterator NextBundleInfo;
/// Current bundle target to be written.
std::string CurWriteBundleTarget;
/// Configuration options and arrays for this bundler job
const OffloadBundlerConfig &BundlerConfig;
public:
// TODO: Add error checking from ClangOffloadBundler.cpp
BinaryFileHandler(const OffloadBundlerConfig &BC) : BundlerConfig(BC) {}
~BinaryFileHandler() final {}
Error ReadHeader(MemoryBuffer &Input) final {
StringRef FC = Input.getBuffer();
// Initialize the current bundle with the end of the container.
CurBundleInfo = BundlesInfo.end();
// Check if buffer is smaller than magic string.
size_t ReadChars = sizeof(OFFLOAD_BUNDLER_MAGIC_STR) - 1;
if (ReadChars > FC.size())
return Error::success();
// Check if no magic was found.
StringRef Magic(FC.data(), sizeof(OFFLOAD_BUNDLER_MAGIC_STR) - 1);
if (!Magic.equals(OFFLOAD_BUNDLER_MAGIC_STR))
return Error::success();
// Read number of bundles.
if (ReadChars + 8 > FC.size())
return Error::success();
uint64_t NumberOfBundles = Read8byteIntegerFromBuffer(FC, ReadChars);
ReadChars += 8;
// Read bundle offsets, sizes and triples.
for (uint64_t i = 0; i < NumberOfBundles; ++i) {
// Read offset.
if (ReadChars + 8 > FC.size())
return Error::success();
uint64_t Offset = Read8byteIntegerFromBuffer(FC, ReadChars);
ReadChars += 8;
// Read size.
if (ReadChars + 8 > FC.size())
return Error::success();
uint64_t Size = Read8byteIntegerFromBuffer(FC, ReadChars);
ReadChars += 8;
// Read triple size.
if (ReadChars + 8 > FC.size())
return Error::success();
uint64_t TripleSize = Read8byteIntegerFromBuffer(FC, ReadChars);
ReadChars += 8;
// Read triple.
if (ReadChars + TripleSize > FC.size())
return Error::success();
StringRef Triple(&FC.data()[ReadChars], TripleSize);
ReadChars += TripleSize;
// Check if the offset and size make sense.
if (!Offset || Offset + Size > FC.size())
return Error::success();
assert(BundlesInfo.find(Triple) == BundlesInfo.end() &&
"Triple is duplicated??");
BundlesInfo[Triple] = BinaryBundleInfo(Size, Offset);
}
// Set the iterator to where we will start to read.
CurBundleInfo = BundlesInfo.end();
NextBundleInfo = BundlesInfo.begin();
return Error::success();
}
Expected<Optional<StringRef>> ReadBundleStart(MemoryBuffer &Input) final {
if (NextBundleInfo == BundlesInfo.end())
return None;
CurBundleInfo = NextBundleInfo++;
return CurBundleInfo->first();
}
Error ReadBundleEnd(MemoryBuffer &Input) final {
assert(CurBundleInfo != BundlesInfo.end() && "Invalid reader info!");
return Error::success();
}
Error ReadBundle(raw_ostream &OS, MemoryBuffer &Input) final {
assert(CurBundleInfo != BundlesInfo.end() && "Invalid reader info!");
StringRef FC = Input.getBuffer();
OS.write(FC.data() + CurBundleInfo->second.Offset,
CurBundleInfo->second.Size);
return Error::success();
}
Error WriteHeader(raw_fd_ostream &OS,
ArrayRef<std::unique_ptr<MemoryBuffer>> Inputs) final {
// Compute size of the header.
uint64_t HeaderSize = 0;
HeaderSize += sizeof(OFFLOAD_BUNDLER_MAGIC_STR) - 1;
HeaderSize += 8; // Number of Bundles
for (auto &T : BundlerConfig.TargetNames) {
HeaderSize += 3 * 8; // Bundle offset, Size of bundle and size of triple.
HeaderSize += T.size(); // The triple.
}
// Write to the buffer the header.
OS << OFFLOAD_BUNDLER_MAGIC_STR;
Write8byteIntegerToBuffer(OS, BundlerConfig.TargetNames.size());
unsigned Idx = 0;
for (auto &T : BundlerConfig.TargetNames) {
MemoryBuffer &MB = *Inputs[Idx++];
HeaderSize = alignTo(HeaderSize, BundlerConfig.BundleAlignment);
// Bundle offset.
Write8byteIntegerToBuffer(OS, HeaderSize);
// Size of the bundle (adds to the next bundle's offset)
Write8byteIntegerToBuffer(OS, MB.getBufferSize());
BundlesInfo[T] = BinaryBundleInfo(MB.getBufferSize(), HeaderSize);
HeaderSize += MB.getBufferSize();
// Size of the triple
Write8byteIntegerToBuffer(OS, T.size());
// Triple
OS << T;
}
return Error::success();
}
Error WriteBundleStart(raw_fd_ostream &OS, StringRef TargetTriple) final {
CurWriteBundleTarget = TargetTriple.str();
return Error::success();
}
Error WriteBundleEnd(raw_fd_ostream &OS, StringRef TargetTriple) final {
return Error::success();
}
Error WriteBundle(raw_fd_ostream &OS, MemoryBuffer &Input) final {
auto BI = BundlesInfo[CurWriteBundleTarget];
OS.seek(BI.Offset);
OS.write(Input.getBufferStart(), Input.getBufferSize());
return Error::success();
}
};
namespace {
// This class implements a list of temporary files that are removed upon
// object destruction.
class TempFileHandlerRAII {
public:
~TempFileHandlerRAII() {
for (const auto &File : Files)
sys::fs::remove(File);
}
// Creates temporary file with given contents.
Expected<StringRef> Create(Optional<ArrayRef<char>> Contents) {
SmallString<128u> File;
if (std::error_code EC =
sys::fs::createTemporaryFile("clang-offload-bundler", "tmp", File))
return createFileError(File, EC);
Files.push_front(File);
if (Contents) {
std::error_code EC;
raw_fd_ostream OS(File, EC);
if (EC)
return createFileError(File, EC);
OS.write(Contents->data(), Contents->size());
}
return Files.front().str();
}
private:
std::forward_list<SmallString<128u>> Files;
};
} // end anonymous namespace
/// Handler for object files. The bundles are organized by sections with a
/// designated name.
///
/// To unbundle, we just copy the contents of the designated section.
class ObjectFileHandler final : public FileHandler {
/// The object file we are currently dealing with.
std::unique_ptr<ObjectFile> Obj;
/// Return the input file contents.
StringRef getInputFileContents() const { return Obj->getData(); }
/// Return bundle name (<kind>-<triple>) if the provided section is an offload
/// section.
static Expected<Optional<StringRef>> IsOffloadSection(SectionRef CurSection) {
Expected<StringRef> NameOrErr = CurSection.getName();
if (!NameOrErr)
return NameOrErr.takeError();
// If it does not start with the reserved suffix, just skip this section.
if (!NameOrErr->startswith(OFFLOAD_BUNDLER_MAGIC_STR))
return None;
// Return the triple that is right after the reserved prefix.
return NameOrErr->substr(sizeof(OFFLOAD_BUNDLER_MAGIC_STR) - 1);
}
/// Total number of inputs.
unsigned NumberOfInputs = 0;
/// Total number of processed inputs, i.e, inputs that were already
/// read from the buffers.
unsigned NumberOfProcessedInputs = 0;
/// Iterator of the current and next section.
section_iterator CurrentSection;
section_iterator NextSection;
/// Configuration options and arrays for this bundler job
const OffloadBundlerConfig &BundlerConfig;
public:
// TODO: Add error checking from ClangOffloadBundler.cpp
ObjectFileHandler(std::unique_ptr<ObjectFile> ObjIn,
const OffloadBundlerConfig &BC)
: Obj(std::move(ObjIn)), CurrentSection(Obj->section_begin()),
NextSection(Obj->section_begin()), BundlerConfig(BC) {}
~ObjectFileHandler() final {}
Error ReadHeader(MemoryBuffer &Input) final { return Error::success(); }
Expected<Optional<StringRef>> ReadBundleStart(MemoryBuffer &Input) final {
while (NextSection != Obj->section_end()) {
CurrentSection = NextSection;
++NextSection;
// Check if the current section name starts with the reserved prefix. If
// so, return the triple.
Expected<Optional<StringRef>> TripleOrErr =
IsOffloadSection(*CurrentSection);
if (!TripleOrErr)
return TripleOrErr.takeError();
if (*TripleOrErr)
return **TripleOrErr;
}
return None;
}
Error ReadBundleEnd(MemoryBuffer &Input) final { return Error::success(); }
Error ReadBundle(raw_ostream &OS, MemoryBuffer &Input) final {
Expected<StringRef> ContentOrErr = CurrentSection->getContents();
if (!ContentOrErr)
return ContentOrErr.takeError();
StringRef Content = *ContentOrErr;
// Copy fat object contents to the output when extracting host bundle.
if (Content.size() == 1u && Content.front() == 0)
Content = StringRef(Input.getBufferStart(), Input.getBufferSize());
OS.write(Content.data(), Content.size());
return Error::success();
}
Error WriteHeader(raw_fd_ostream &OS,
ArrayRef<std::unique_ptr<MemoryBuffer>> Inputs) final {
assert(BundlerConfig.HostInputIndex != ~0u &&
"Host input index not defined.");
// Record number of inputs.
NumberOfInputs = Inputs.size();
return Error::success();
}
Error WriteBundleStart(raw_fd_ostream &OS, StringRef TargetTriple) final {
++NumberOfProcessedInputs;
return Error::success();
}
Error WriteBundleEnd(raw_fd_ostream &OS, StringRef TargetTriple) final {
assert(NumberOfProcessedInputs <= NumberOfInputs &&
"Processing more inputs that actually exist!");
assert(BundlerConfig.HostInputIndex != ~0u &&
"Host input index not defined.");
// If this is not the last output, we don't have to do anything.
if (NumberOfProcessedInputs != NumberOfInputs)
return Error::success();
// We will use llvm-objcopy to add target objects sections to the output
// fat object. These sections should have 'exclude' flag set which tells
// link editor to remove them from linker inputs when linking executable or
// shared library.
assert(BundlerConfig.ObjcopyPath != "" &&
"llvm-objcopy path not specified");
// We write to the output file directly. So, we close it and use the name
// to pass down to llvm-objcopy.
OS.close();
// Temporary files that need to be removed.
TempFileHandlerRAII TempFiles;
// Compose llvm-objcopy command line for add target objects' sections with
// appropriate flags.
BumpPtrAllocator Alloc;
StringSaver SS{Alloc};
SmallVector<StringRef, 8u> ObjcopyArgs{"llvm-objcopy"};
for (unsigned I = 0; I < NumberOfInputs; ++I) {
StringRef InputFile = BundlerConfig.InputFileNames[I];
if (I == BundlerConfig.HostInputIndex) {
// Special handling for the host bundle. We do not need to add a
// standard bundle for the host object since we are going to use fat
// object as a host object. Therefore use dummy contents (one zero byte)
// when creating section for the host bundle.
Expected<StringRef> TempFileOrErr = TempFiles.Create(ArrayRef<char>(0));
if (!TempFileOrErr)
return TempFileOrErr.takeError();
InputFile = *TempFileOrErr;
}
ObjcopyArgs.push_back(
SS.save(Twine("--add-section=") + OFFLOAD_BUNDLER_MAGIC_STR +
BundlerConfig.TargetNames[I] + "=" + InputFile));
ObjcopyArgs.push_back(
SS.save(Twine("--set-section-flags=") + OFFLOAD_BUNDLER_MAGIC_STR +
BundlerConfig.TargetNames[I] + "=readonly,exclude"));
}
ObjcopyArgs.push_back("--");
ObjcopyArgs.push_back(
BundlerConfig.InputFileNames[BundlerConfig.HostInputIndex]);
ObjcopyArgs.push_back(BundlerConfig.OutputFileNames.front());
if (Error Err = executeObjcopy(BundlerConfig.ObjcopyPath, ObjcopyArgs))
return Err;
return Error::success();
}
Error WriteBundle(raw_fd_ostream &OS, MemoryBuffer &Input) final {
return Error::success();
}
private:
Error executeObjcopy(StringRef Objcopy, ArrayRef<StringRef> Args) {
// If the user asked for the commands to be printed out, we do that
// instead of executing it.
if (BundlerConfig.PrintExternalCommands) {
errs() << "\"" << Objcopy << "\"";
for (StringRef Arg : drop_begin(Args, 1))
errs() << " \"" << Arg << "\"";
errs() << "\n";
} else {
if (sys::ExecuteAndWait(Objcopy, Args))
return createStringError(inconvertibleErrorCode(),
"'llvm-objcopy' tool failed");
}
return Error::success();
}
};
/// Handler for text files. The bundled file will have the following format.
///
/// "Comment OFFLOAD_BUNDLER_MAGIC_STR__START__ triple"
/// Bundle 1
/// "Comment OFFLOAD_BUNDLER_MAGIC_STR__END__ triple"
/// ...
/// "Comment OFFLOAD_BUNDLER_MAGIC_STR__START__ triple"
/// Bundle N
/// "Comment OFFLOAD_BUNDLER_MAGIC_STR__END__ triple"
class TextFileHandler final : public FileHandler {
/// String that begins a line comment.
StringRef Comment;
/// String that initiates a bundle.
std::string BundleStartString;
/// String that closes a bundle.
std::string BundleEndString;
/// Number of chars read from input.
size_t ReadChars = 0u;
protected:
Error ReadHeader(MemoryBuffer &Input) final { return Error::success(); }
Expected<Optional<StringRef>> ReadBundleStart(MemoryBuffer &Input) final {
StringRef FC = Input.getBuffer();
// Find start of the bundle.
ReadChars = FC.find(BundleStartString, ReadChars);
if (ReadChars == FC.npos)
return None;
// Get position of the triple.
size_t TripleStart = ReadChars = ReadChars + BundleStartString.size();
// Get position that closes the triple.
size_t TripleEnd = ReadChars = FC.find("\n", ReadChars);
if (TripleEnd == FC.npos)
return None;
// Next time we read after the new line.
++ReadChars;
return StringRef(&FC.data()[TripleStart], TripleEnd - TripleStart);
}
Error ReadBundleEnd(MemoryBuffer &Input) final {
StringRef FC = Input.getBuffer();
// Read up to the next new line.
assert(FC[ReadChars] == '\n' && "The bundle should end with a new line.");
size_t TripleEnd = ReadChars = FC.find("\n", ReadChars + 1);
if (TripleEnd != FC.npos)
// Next time we read after the new line.
++ReadChars;
return Error::success();
}
Error ReadBundle(raw_ostream &OS, MemoryBuffer &Input) final {
StringRef FC = Input.getBuffer();
size_t BundleStart = ReadChars;
// Find end of the bundle.
size_t BundleEnd = ReadChars = FC.find(BundleEndString, ReadChars);
StringRef Bundle(&FC.data()[BundleStart], BundleEnd - BundleStart);
OS << Bundle;
return Error::success();
}
Error WriteHeader(raw_fd_ostream &OS,
ArrayRef<std::unique_ptr<MemoryBuffer>> Inputs) final {
return Error::success();
}
Error WriteBundleStart(raw_fd_ostream &OS, StringRef TargetTriple) final {
OS << BundleStartString << TargetTriple << "\n";
return Error::success();
}
Error WriteBundleEnd(raw_fd_ostream &OS, StringRef TargetTriple) final {
OS << BundleEndString << TargetTriple << "\n";
return Error::success();
}
Error WriteBundle(raw_fd_ostream &OS, MemoryBuffer &Input) final {
OS << Input.getBuffer();
return Error::success();
}
public:
TextFileHandler(StringRef Comment) : Comment(Comment), ReadChars(0) {
BundleStartString =
"\n" + Comment.str() + " " OFFLOAD_BUNDLER_MAGIC_STR "__START__ ";
BundleEndString =
"\n" + Comment.str() + " " OFFLOAD_BUNDLER_MAGIC_STR "__END__ ";
}
Error listBundleIDsCallback(MemoryBuffer &Input,
const BundleInfo &Info) final {
// TODO: To list bundle IDs in a bundled text file we need to go through
// all bundles. The format of bundled text file may need to include a
// header if the performance of listing bundle IDs of bundled text file is
// important.
ReadChars = Input.getBuffer().find(BundleEndString, ReadChars);
if (Error Err = ReadBundleEnd(Input))
return Err;
return Error::success();
}
};
/// Return an appropriate object file handler. We use the specific object
/// handler if we know how to deal with that format, otherwise we use a default
/// binary file handler.
static std::unique_ptr<FileHandler>
CreateObjectFileHandler(MemoryBuffer &FirstInput,
const OffloadBundlerConfig &BundlerConfig) {
// Check if the input file format is one that we know how to deal with.
Expected<std::unique_ptr<Binary>> BinaryOrErr = createBinary(FirstInput);
// We only support regular object files. If failed to open the input as a
// known binary or this is not an object file use the default binary handler.
if (errorToBool(BinaryOrErr.takeError()) || !isa<ObjectFile>(*BinaryOrErr))
return std::make_unique<BinaryFileHandler>(BundlerConfig);
// Otherwise create an object file handler. The handler will be owned by the
// client of this function.
return std::make_unique<ObjectFileHandler>(
std::unique_ptr<ObjectFile>(cast<ObjectFile>(BinaryOrErr->release())),
BundlerConfig);
}
/// Return an appropriate handler given the input files and options.
static Expected<std::unique_ptr<FileHandler>>
CreateFileHandler(MemoryBuffer &FirstInput,
const OffloadBundlerConfig &BundlerConfig) {
std::string FilesType = BundlerConfig.FilesType;
if (FilesType == "i")
return std::make_unique<TextFileHandler>(/*Comment=*/"//");
if (FilesType == "ii")
return std::make_unique<TextFileHandler>(/*Comment=*/"//");
if (FilesType == "cui")
return std::make_unique<TextFileHandler>(/*Comment=*/"//");
// TODO: `.d` should be eventually removed once `-M` and its variants are
// handled properly in offload compilation.
if (FilesType == "d")
return std::make_unique<TextFileHandler>(/*Comment=*/"#");
if (FilesType == "ll")
return std::make_unique<TextFileHandler>(/*Comment=*/";");
if (FilesType == "bc")
return std::make_unique<BinaryFileHandler>(BundlerConfig);
if (FilesType == "s")
return std::make_unique<TextFileHandler>(/*Comment=*/"#");
if (FilesType == "o")
return CreateObjectFileHandler(FirstInput, BundlerConfig);
if (FilesType == "a")
return CreateObjectFileHandler(FirstInput, BundlerConfig);
if (FilesType == "gch")
return std::make_unique<BinaryFileHandler>(BundlerConfig);
if (FilesType == "ast")
return std::make_unique<BinaryFileHandler>(BundlerConfig);
return createStringError(errc::invalid_argument,
"'" + FilesType + "': invalid file type specified");
}
// List bundle IDs. Return true if an error was found.
Error OffloadBundler::ListBundleIDsInFile(
StringRef InputFileName, const OffloadBundlerConfig &BundlerConfig) {
// Open Input file.
ErrorOr<std::unique_ptr<MemoryBuffer>> CodeOrErr =
MemoryBuffer::getFileOrSTDIN(InputFileName);
if (std::error_code EC = CodeOrErr.getError())
return createFileError(InputFileName, EC);
MemoryBuffer &Input = **CodeOrErr;
// Select the right files handler.
Expected<std::unique_ptr<FileHandler>> FileHandlerOrErr =
CreateFileHandler(Input, BundlerConfig);
if (!FileHandlerOrErr)
return FileHandlerOrErr.takeError();
std::unique_ptr<FileHandler> &FH = *FileHandlerOrErr;
assert(FH);
return FH->listBundleIDs(Input);
}
/// Bundle the files. Return true if an error was found.
Error OffloadBundler::BundleFiles() {
std::error_code EC;
// Create output file.
raw_fd_ostream OutputFile(BundlerConfig.OutputFileNames.front(), EC,
sys::fs::OF_None);
if (EC)
return createFileError(BundlerConfig.OutputFileNames.front(), EC);
// Open input files.
SmallVector<std::unique_ptr<MemoryBuffer>, 8u> InputBuffers;
InputBuffers.reserve(BundlerConfig.InputFileNames.size());
for (auto &I : BundlerConfig.InputFileNames) {
ErrorOr<std::unique_ptr<MemoryBuffer>> CodeOrErr =
MemoryBuffer::getFileOrSTDIN(I);
if (std::error_code EC = CodeOrErr.getError())
return createFileError(I, EC);
InputBuffers.emplace_back(std::move(*CodeOrErr));
}
// Get the file handler. We use the host buffer as reference.
assert((BundlerConfig.HostInputIndex != ~0u || BundlerConfig.AllowNoHost) &&
"Host input index undefined??");
Expected<std::unique_ptr<FileHandler>> FileHandlerOrErr = CreateFileHandler(
*InputBuffers[BundlerConfig.AllowNoHost ? 0
: BundlerConfig.HostInputIndex],
BundlerConfig);
if (!FileHandlerOrErr)
return FileHandlerOrErr.takeError();
std::unique_ptr<FileHandler> &FH = *FileHandlerOrErr;
assert(FH);
// Write header.
if (Error Err = FH->WriteHeader(OutputFile, InputBuffers))
return Err;
// Write all bundles along with the start/end markers. If an error was found
// writing the end of the bundle component, abort the bundle writing.
auto Input = InputBuffers.begin();
for (auto &Triple : BundlerConfig.TargetNames) {
if (Error Err = FH->WriteBundleStart(OutputFile, Triple))
return Err;
if (Error Err = FH->WriteBundle(OutputFile, **Input))
return Err;
if (Error Err = FH->WriteBundleEnd(OutputFile, Triple))
return Err;
++Input;
}
return Error::success();
}
// Unbundle the files. Return true if an error was found.
Error OffloadBundler::UnbundleFiles() {
// Open Input file.
ErrorOr<std::unique_ptr<MemoryBuffer>> CodeOrErr =
MemoryBuffer::getFileOrSTDIN(BundlerConfig.InputFileNames.front());
if (std::error_code EC = CodeOrErr.getError())
return createFileError(BundlerConfig.InputFileNames.front(), EC);
MemoryBuffer &Input = **CodeOrErr;
// Select the right files handler.
Expected<std::unique_ptr<FileHandler>> FileHandlerOrErr =
CreateFileHandler(Input, BundlerConfig);
if (!FileHandlerOrErr)
return FileHandlerOrErr.takeError();
std::unique_ptr<FileHandler> &FH = *FileHandlerOrErr;
assert(FH);
// Read the header of the bundled file.
if (Error Err = FH->ReadHeader(Input))
return Err;
// Create a work list that consist of the map triple/output file.
StringMap<StringRef> Worklist;
auto Output = BundlerConfig.OutputFileNames.begin();
for (auto &Triple : BundlerConfig.TargetNames) {
Worklist[Triple] = *Output;
++Output;
}
// Read all the bundles that are in the work list. If we find no bundles we
// assume the file is meant for the host target.
bool FoundHostBundle = false;
while (!Worklist.empty()) {
Expected<Optional<StringRef>> CurTripleOrErr = FH->ReadBundleStart(Input);
if (!CurTripleOrErr)
return CurTripleOrErr.takeError();
// We don't have more bundles.
if (!*CurTripleOrErr)
break;
StringRef CurTriple = **CurTripleOrErr;
assert(!CurTriple.empty());
auto Output = Worklist.begin();
for (auto E = Worklist.end(); Output != E; Output++) {
if (isCodeObjectCompatible(
OffloadTargetInfo(CurTriple, BundlerConfig),
OffloadTargetInfo((*Output).first(), BundlerConfig))) {
break;
}
}
if (Output == Worklist.end())
continue;
// Check if the output file can be opened and copy the bundle to it.
std::error_code EC;
raw_fd_ostream OutputFile((*Output).second, EC, sys::fs::OF_None);
if (EC)
return createFileError((*Output).second, EC);
if (Error Err = FH->ReadBundle(OutputFile, Input))
return Err;
if (Error Err = FH->ReadBundleEnd(Input))
return Err;
Worklist.erase(Output);
// Record if we found the host bundle.
auto OffloadInfo = OffloadTargetInfo(CurTriple, BundlerConfig);
if (OffloadInfo.hasHostKind())
FoundHostBundle = true;
}
if (!BundlerConfig.AllowMissingBundles && !Worklist.empty()) {
std::string ErrMsg = "Can't find bundles for";
std::set<StringRef> Sorted;
for (auto &E : Worklist)
Sorted.insert(E.first());
unsigned I = 0;
unsigned Last = Sorted.size() - 1;
for (auto &E : Sorted) {
if (I != 0 && Last > 1)
ErrMsg += ",";
ErrMsg += " ";
if (I == Last && I != 0)
ErrMsg += "and ";
ErrMsg += E.str();
++I;
}
return createStringError(inconvertibleErrorCode(), ErrMsg);
}
// If no bundles were found, assume the input file is the host bundle and
// create empty files for the remaining targets.
if (Worklist.size() == BundlerConfig.TargetNames.size()) {
for (auto &E : Worklist) {
std::error_code EC;
raw_fd_ostream OutputFile(E.second, EC, sys::fs::OF_None);
if (EC)
return createFileError(E.second, EC);
// If this entry has a host kind, copy the input file to the output file.
auto OffloadInfo = OffloadTargetInfo(E.getKey(), BundlerConfig);
if (OffloadInfo.hasHostKind())
OutputFile.write(Input.getBufferStart(), Input.getBufferSize());
}
return Error::success();
}
// If we found elements, we emit an error if none of those were for the host
// in case host bundle name was provided in command line.
if (!FoundHostBundle && BundlerConfig.HostInputIndex != ~0u)
return createStringError(inconvertibleErrorCode(),
"Can't find bundle for the host target");
// If we still have any elements in the worklist, create empty files for them.
for (auto &E : Worklist) {
std::error_code EC;
raw_fd_ostream OutputFile(E.second, EC, sys::fs::OF_None);
if (EC)
return createFileError(E.second, EC);
}
return Error::success();
}
static Archive::Kind getDefaultArchiveKindForHost() {
return Triple(sys::getDefaultTargetTriple()).isOSDarwin() ? Archive::K_DARWIN
: Archive::K_GNU;
}
/// @brief Computes a list of targets among all given targets which are
/// compatible with this code object
/// @param [in] CodeObjectInfo Code Object
/// @param [out] CompatibleTargets List of all compatible targets among all
/// given targets
/// @return false, if no compatible target is found.
static bool
getCompatibleOffloadTargets(OffloadTargetInfo &CodeObjectInfo,
SmallVectorImpl<StringRef> &CompatibleTargets,
const OffloadBundlerConfig &BundlerConfig) {
if (!CompatibleTargets.empty()) {
DEBUG_WITH_TYPE("CodeObjectCompatibility",
dbgs() << "CompatibleTargets list should be empty\n");
return false;
}
for (auto &Target : BundlerConfig.TargetNames) {
auto TargetInfo = OffloadTargetInfo(Target, BundlerConfig);
if (isCodeObjectCompatible(CodeObjectInfo, TargetInfo))
CompatibleTargets.push_back(Target);
}
return !CompatibleTargets.empty();
}
/// UnbundleArchive takes an archive file (".a") as input containing bundled
/// code object files, and a list of offload targets (not host), and extracts
/// the code objects into a new archive file for each offload target. Each
/// resulting archive file contains all code object files corresponding to that
/// particular offload target. The created archive file does not
/// contain an index of the symbols and code object files are named as
/// <<Parent Bundle Name>-<CodeObject's GPUArch>>, with ':' replaced with '_'.
Error OffloadBundler::UnbundleArchive() {
std::vector<std::unique_ptr<MemoryBuffer>> ArchiveBuffers;
/// Map of target names with list of object files that will form the device
/// specific archive for that target
StringMap<std::vector<NewArchiveMember>> OutputArchivesMap;
// Map of target names and output archive filenames
StringMap<StringRef> TargetOutputFileNameMap;
auto Output = BundlerConfig.OutputFileNames.begin();
for (auto &Target : BundlerConfig.TargetNames) {
TargetOutputFileNameMap[Target] = *Output;
++Output;
}
StringRef IFName = BundlerConfig.InputFileNames.front();
ErrorOr<std::unique_ptr<MemoryBuffer>> BufOrErr =
MemoryBuffer::getFileOrSTDIN(IFName, true, false);
if (std::error_code EC = BufOrErr.getError())
return createFileError(BundlerConfig.InputFileNames.front(), EC);
ArchiveBuffers.push_back(std::move(*BufOrErr));
Expected<std::unique_ptr<llvm::object::Archive>> LibOrErr =
Archive::create(ArchiveBuffers.back()->getMemBufferRef());
if (!LibOrErr)
return LibOrErr.takeError();
auto Archive = std::move(*LibOrErr);
Error ArchiveErr = Error::success();
auto ChildEnd = Archive->child_end();
/// Iterate over all bundled code object files in the input archive.
for (auto ArchiveIter = Archive->child_begin(ArchiveErr);
ArchiveIter != ChildEnd; ++ArchiveIter) {
if (ArchiveErr)
return ArchiveErr;
auto ArchiveChildNameOrErr = (*ArchiveIter).getName();
if (!ArchiveChildNameOrErr)
return ArchiveChildNameOrErr.takeError();
StringRef BundledObjectFile = sys::path::filename(*ArchiveChildNameOrErr);
auto CodeObjectBufferRefOrErr = (*ArchiveIter).getMemoryBufferRef();
if (!CodeObjectBufferRefOrErr)
return CodeObjectBufferRefOrErr.takeError();
auto CodeObjectBuffer =
MemoryBuffer::getMemBuffer(*CodeObjectBufferRefOrErr, false);
Expected<std::unique_ptr<FileHandler>> FileHandlerOrErr =
CreateFileHandler(*CodeObjectBuffer, BundlerConfig);
if (!FileHandlerOrErr)
return FileHandlerOrErr.takeError();
std::unique_ptr<FileHandler> &FileHandler = *FileHandlerOrErr;
assert(FileHandler &&
"FileHandle creation failed for file in the archive!");
if (Error ReadErr = FileHandler.get()->ReadHeader(*CodeObjectBuffer))
return ReadErr;
Expected<Optional<StringRef>> CurBundleIDOrErr =
FileHandler->ReadBundleStart(*CodeObjectBuffer);
if (!CurBundleIDOrErr)
return CurBundleIDOrErr.takeError();
Optional<StringRef> OptionalCurBundleID = *CurBundleIDOrErr;
// No device code in this child, skip.
if (!OptionalCurBundleID)
continue;
StringRef CodeObject = *OptionalCurBundleID;
// Process all bundle entries (CodeObjects) found in this child of input
// archive.
while (!CodeObject.empty()) {
SmallVector<StringRef> CompatibleTargets;
auto CodeObjectInfo = OffloadTargetInfo(CodeObject, BundlerConfig);
if (CodeObjectInfo.hasHostKind()) {
// Do nothing, we don't extract host code yet.
} else if (getCompatibleOffloadTargets(CodeObjectInfo, CompatibleTargets,
BundlerConfig)) {
std::string BundleData;
raw_string_ostream DataStream(BundleData);
if (Error Err =
FileHandler.get()->ReadBundle(DataStream, *CodeObjectBuffer))
return Err;
for (auto &CompatibleTarget : CompatibleTargets) {
SmallString<128> BundledObjectFileName;
BundledObjectFileName.assign(BundledObjectFile);
auto OutputBundleName =
Twine(llvm::sys::path::stem(BundledObjectFileName) + "-" +
CodeObject +
getDeviceLibraryFileName(BundledObjectFileName,
CodeObjectInfo.TargetID))
.str();
// Replace ':' in optional target feature list with '_' to ensure
// cross-platform validity.
std::replace(OutputBundleName.begin(), OutputBundleName.end(), ':',
'_');
std::unique_ptr<MemoryBuffer> MemBuf = MemoryBuffer::getMemBufferCopy(
DataStream.str(), OutputBundleName);
ArchiveBuffers.push_back(std::move(MemBuf));
llvm::MemoryBufferRef MemBufRef =
MemoryBufferRef(*(ArchiveBuffers.back()));
// For inserting <CompatibleTarget, list<CodeObject>> entry in
// OutputArchivesMap.
if (OutputArchivesMap.find(CompatibleTarget) ==
OutputArchivesMap.end()) {
std::vector<NewArchiveMember> ArchiveMembers;
ArchiveMembers.push_back(NewArchiveMember(MemBufRef));
OutputArchivesMap.insert_or_assign(CompatibleTarget,
std::move(ArchiveMembers));
} else {
OutputArchivesMap[CompatibleTarget].push_back(
NewArchiveMember(MemBufRef));
}
}
}
if (Error Err = FileHandler.get()->ReadBundleEnd(*CodeObjectBuffer))
return Err;
Expected<Optional<StringRef>> NextTripleOrErr =
FileHandler->ReadBundleStart(*CodeObjectBuffer);
if (!NextTripleOrErr)
return NextTripleOrErr.takeError();
CodeObject = ((*NextTripleOrErr).has_value()) ? **NextTripleOrErr : "";
} // End of processing of all bundle entries of this child of input archive.
} // End of while over children of input archive.
assert(!ArchiveErr && "Error occurred while reading archive!");
/// Write out an archive for each target
for (auto &Target : BundlerConfig.TargetNames) {
StringRef FileName = TargetOutputFileNameMap[Target];
StringMapIterator<std::vector<llvm::NewArchiveMember>> CurArchiveMembers =
OutputArchivesMap.find(Target);
if (CurArchiveMembers != OutputArchivesMap.end()) {
if (Error WriteErr = writeArchive(FileName, CurArchiveMembers->getValue(),
true, getDefaultArchiveKindForHost(),
true, false, nullptr))
return WriteErr;
} else if (!BundlerConfig.AllowMissingBundles) {
std::string ErrMsg =
Twine("no compatible code object found for the target '" + Target +
"' in heterogeneous archive library: " + IFName)
.str();
return createStringError(inconvertibleErrorCode(), ErrMsg);
} else { // Create an empty archive file if no compatible code object is
// found and "allow-missing-bundles" is enabled. It ensures that
// the linker using output of this step doesn't complain about
// the missing input file.
std::vector<llvm::NewArchiveMember> EmptyArchive;
EmptyArchive.clear();
if (Error WriteErr = writeArchive(FileName, EmptyArchive, true,
getDefaultArchiveKindForHost(), true,
false, nullptr))
return WriteErr;
}
}
return Error::success();
}
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