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//===-- clang-offload-bundler/ClangOffloadBundler.cpp ---------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file implements a clang-offload-bundler 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 tool.
///
//===----------------------------------------------------------------------===//
#include "clang/Basic/Version.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Bitcode/BitcodeWriter.h"
#include "llvm/IR/Constant.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/Object/Binary.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Program.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/Signals.h"
#include <algorithm>
#include <cassert>
#include <cstddef>
#include <cstdint>
#include <memory>
#include <string>
#include <system_error>
#include <vector>
using namespace llvm;
using namespace llvm::object;
static cl::opt<bool> Help("h", cl::desc("Alias for -help"), cl::Hidden);
// Mark all our options with this category, everything else (except for -version
// and -help) will be hidden.
static cl::OptionCategory
ClangOffloadBundlerCategory("clang-offload-bundler options");
static cl::list<std::string>
InputFileNames("inputs", cl::CommaSeparated, cl::OneOrMore,
cl::desc("[<input file>,...]"),
cl::cat(ClangOffloadBundlerCategory));
static cl::list<std::string>
OutputFileNames("outputs", cl::CommaSeparated, cl::OneOrMore,
cl::desc("[<output file>,...]"),
cl::cat(ClangOffloadBundlerCategory));
static cl::list<std::string>
TargetNames("targets", cl::CommaSeparated, cl::OneOrMore,
cl::desc("[<offload kind>-<target triple>,...]"),
cl::cat(ClangOffloadBundlerCategory));
static cl::opt<std::string>
FilesType("type", cl::Required,
cl::desc("Type of the files to be bundled/unbundled.\n"
"Current supported types are:\n"
" i - cpp-output\n"
" ii - c++-cpp-output\n"
" ll - llvm\n"
" bc - llvm-bc\n"
" s - assembler\n"
" o - object\n"
" gch - precompiled-header\n"
" ast - clang AST file"),
cl::cat(ClangOffloadBundlerCategory));
static cl::opt<bool>
Unbundle("unbundle",
cl::desc("Unbundle bundled file into several output files.\n"),
cl::init(false), cl::cat(ClangOffloadBundlerCategory));
static cl::opt<bool> PrintExternalCommands(
"###",
cl::desc("Print any external commands that are to be executed "
"instead of actually executing them - for testing purposes.\n"),
cl::init(false), cl::cat(ClangOffloadBundlerCategory));
static cl::opt<bool> DumpTemporaryFiles(
"dump-temporary-files",
cl::desc("Dumps any temporary files created - for testing purposes.\n"),
cl::init(false), cl::cat(ClangOffloadBundlerCategory));
/// Magic string that marks the existence of offloading data.
#define OFFLOAD_BUNDLER_MAGIC_STR "__CLANG_OFFLOAD_BUNDLE__"
/// The index of the host input in the list of inputs.
static unsigned HostInputIndex = ~0u;
/// Path to the current binary.
static std::string BundlerExecutable;
/// Obtain the offload kind and real machine triple out of the target
/// information specified by the user.
static void getOffloadKindAndTriple(StringRef Target, StringRef &OffloadKind,
StringRef &Triple) {
auto KindTriplePair = Target.split('-');
OffloadKind = KindTriplePair.first;
Triple = KindTriplePair.second;
}
static StringRef getTriple(StringRef Target) {
StringRef OffloadKind;
StringRef Triple;
getOffloadKindAndTriple(Target, OffloadKind, Triple);
return Triple;
}
static bool hasHostKind(StringRef Target) {
StringRef OffloadKind;
StringRef Triple;
getOffloadKindAndTriple(Target, OffloadKind, Triple);
return OffloadKind == "host";
}
/// Generic file handler interface.
class FileHandler {
public:
FileHandler() {}
virtual ~FileHandler() {}
/// Update the file handler with information from the header of the bundled
/// file
virtual void ReadHeader(MemoryBuffer &Input) = 0;
/// Read the marker of the next bundled to be read in the file. The triple of
/// the target associated with that bundle is returned. An empty string is
/// returned if there are no more bundles to be read.
virtual StringRef ReadBundleStart(MemoryBuffer &Input) = 0;
/// Read the marker that closes the current bundle.
virtual void ReadBundleEnd(MemoryBuffer &Input) = 0;
/// Read the current bundle and write the result into the stream \a OS.
virtual void ReadBundle(raw_fd_ostream &OS, MemoryBuffer &Input) = 0;
/// Write the header of the bundled file to \a OS based on the information
/// gathered from \a Inputs.
virtual void 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 void WriteBundleStart(raw_fd_ostream &OS, StringRef TargetTriple) = 0;
/// Write the marker that closes a bundle for the triple \a TargetTriple to \a
/// OS. Return true if any error was found.
virtual bool WriteBundleEnd(raw_fd_ostream &OS, StringRef TargetTriple) = 0;
/// Write the bundle from \a Input into \a OS.
virtual void WriteBundle(raw_fd_ostream &OS, MemoryBuffer &Input) = 0;
};
/// 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 BundleInfo final {
/// Size of the bundle.
uint64_t Size = 0u;
/// Offset at which the bundle starts in the bundled file.
uint64_t Offset = 0u;
BundleInfo() {}
BundleInfo(uint64_t Size, uint64_t Offset) : Size(Size), Offset(Offset) {}
};
/// Map between a triple and the corresponding bundle information.
StringMap<BundleInfo> BundlesInfo;
/// Iterator for the bundle information that is being read.
StringMap<BundleInfo>::iterator CurBundleInfo;
public:
BinaryFileHandler() : FileHandler() {}
~BinaryFileHandler() final {}
void 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;
// Check if no magic was found.
StringRef Magic(FC.data(), sizeof(OFFLOAD_BUNDLER_MAGIC_STR) - 1);
if (!Magic.equals(OFFLOAD_BUNDLER_MAGIC_STR))
return;
// Read number of bundles.
if (ReadChars + 8 > FC.size())
return;
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;
uint64_t Offset = Read8byteIntegerFromBuffer(FC, ReadChars);
ReadChars += 8;
// Read size.
if (ReadChars + 8 > FC.size())
return;
uint64_t Size = Read8byteIntegerFromBuffer(FC, ReadChars);
ReadChars += 8;
// Read triple size.
if (ReadChars + 8 > FC.size())
return;
uint64_t TripleSize = Read8byteIntegerFromBuffer(FC, ReadChars);
ReadChars += 8;
// Read triple.
if (ReadChars + TripleSize > FC.size())
return;
StringRef Triple(&FC.data()[ReadChars], TripleSize);
ReadChars += TripleSize;
// Check if the offset and size make sense.
if (!Size || !Offset || Offset + Size > FC.size())
return;
assert(BundlesInfo.find(Triple) == BundlesInfo.end() &&
"Triple is duplicated??");
BundlesInfo[Triple] = BundleInfo(Size, Offset);
}
// Set the iterator to where we will start to read.
CurBundleInfo = BundlesInfo.begin();
}
StringRef ReadBundleStart(MemoryBuffer &Input) final {
if (CurBundleInfo == BundlesInfo.end())
return StringRef();
return CurBundleInfo->first();
}
void ReadBundleEnd(MemoryBuffer &Input) final {
assert(CurBundleInfo != BundlesInfo.end() && "Invalid reader info!");
++CurBundleInfo;
}
void ReadBundle(raw_fd_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);
}
void 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 : 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, TargetNames.size());
unsigned Idx = 0;
for (auto &T : TargetNames) {
MemoryBuffer &MB = *Inputs[Idx++].get();
// Bundle offset.
Write8byteIntegerToBuffer(OS, HeaderSize);
// Size of the bundle (adds to the next bundle's offset)
Write8byteIntegerToBuffer(OS, MB.getBufferSize());
HeaderSize += MB.getBufferSize();
// Size of the triple
Write8byteIntegerToBuffer(OS, T.size());
// Triple
OS << T;
}
}
void WriteBundleStart(raw_fd_ostream &OS, StringRef TargetTriple) final {}
bool WriteBundleEnd(raw_fd_ostream &OS, StringRef TargetTriple) final {
return false;
}
void WriteBundle(raw_fd_ostream &OS, MemoryBuffer &Input) final {
OS.write(Input.getBufferStart(), Input.getBufferSize());
}
};
/// Handler for object files. The bundles are organized by sections with a
/// designated name.
///
/// In order to bundle we create an IR file with the content of each section and
/// use incremental linking to produce the resulting object. We also add section
/// with a single byte to state the name of the component the main object file
/// (the one we are bundling into) refers to.
///
/// To unbundle, we use just copy the contents of the designated section. If the
/// requested bundle refer to the main object file, we just copy it with no
/// changes.
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 true if the provided section is an offload section and return the
/// triple by reference.
static bool IsOffloadSection(SectionRef CurSection,
StringRef &OffloadTriple) {
StringRef SectionName;
CurSection.getName(SectionName);
if (SectionName.empty())
return false;
// If it does not start with the reserved suffix, just skip this section.
if (!SectionName.startswith(OFFLOAD_BUNDLER_MAGIC_STR))
return false;
// Return the triple that is right after the reserved prefix.
OffloadTriple = SectionName.substr(sizeof(OFFLOAD_BUNDLER_MAGIC_STR) - 1);
return true;
}
/// 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;
/// LLVM context used to create the auxiliary modules.
LLVMContext VMContext;
/// LLVM module used to create an object with all the bundle
/// components.
std::unique_ptr<Module> AuxModule;
/// The current triple we are working with.
StringRef CurrentTriple;
/// The name of the main input file.
StringRef MainInputFileName;
/// Iterator of the current and next section.
section_iterator CurrentSection;
section_iterator NextSection;
public:
ObjectFileHandler(std::unique_ptr<ObjectFile> ObjIn)
: FileHandler(), Obj(std::move(ObjIn)),
CurrentSection(Obj->section_begin()),
NextSection(Obj->section_begin()) {}
~ObjectFileHandler() final {}
void ReadHeader(MemoryBuffer &Input) final {}
StringRef ReadBundleStart(MemoryBuffer &Input) final {
while (NextSection != Obj->section_end()) {
CurrentSection = NextSection;
++NextSection;
StringRef OffloadTriple;
// Check if the current section name starts with the reserved prefix. If
// so, return the triple.
if (IsOffloadSection(*CurrentSection, OffloadTriple))
return OffloadTriple;
}
return StringRef();
}
void ReadBundleEnd(MemoryBuffer &Input) final {}
void ReadBundle(raw_fd_ostream &OS, MemoryBuffer &Input) final {
// If the current section has size one, that means that the content we are
// interested in is the file itself. Otherwise it is the content of the
// section.
//
// TODO: Instead of copying the input file as is, deactivate the section
// that is no longer needed.
StringRef Content;
CurrentSection->getContents(Content);
if (Content.size() < 2)
OS.write(Input.getBufferStart(), Input.getBufferSize());
else
OS.write(Content.data(), Content.size());
}
void WriteHeader(raw_fd_ostream &OS,
ArrayRef<std::unique_ptr<MemoryBuffer>> Inputs) final {
assert(HostInputIndex != ~0u && "Host input index not defined.");
// Record number of inputs.
NumberOfInputs = Inputs.size();
// Create an LLVM module to have the content we need to bundle.
auto *M = new Module("clang-offload-bundle", VMContext);
M->setTargetTriple(getTriple(TargetNames[HostInputIndex]));
AuxModule.reset(M);
}
void WriteBundleStart(raw_fd_ostream &OS, StringRef TargetTriple) final {
++NumberOfProcessedInputs;
// Record the triple we are using, that will be used to name the section we
// will create.
CurrentTriple = TargetTriple;
}
bool WriteBundleEnd(raw_fd_ostream &OS, StringRef TargetTriple) final {
assert(NumberOfProcessedInputs <= NumberOfInputs &&
"Processing more inputs that actually exist!");
assert(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 false;
// Create the bitcode file name to write the resulting code to. Keep it if
// save-temps is active.
SmallString<128> BitcodeFileName;
if (sys::fs::createTemporaryFile("clang-offload-bundler", "bc",
BitcodeFileName)) {
errs() << "error: unable to create temporary file.\n";
return true;
}
// Dump the contents of the temporary file if that was requested.
if (DumpTemporaryFiles) {
errs() << ";\n; Object file bundler IR file.\n;\n";
AuxModule.get()->print(errs(), nullptr,
/*ShouldPreserveUseListOrder=*/false,
/*IsForDebug=*/true);
errs() << '\n';
}
// Find clang in order to create the bundle binary.
StringRef Dir = sys::path::parent_path(BundlerExecutable);
auto ClangBinary = sys::findProgramByName("clang", Dir);
if (ClangBinary.getError()) {
// Remove bitcode file.
sys::fs::remove(BitcodeFileName);
errs() << "error: unable to find 'clang' in path.\n";
return true;
}
// Do the incremental linking. We write to the output file directly. So, we
// close it and use the name to pass down to clang.
OS.close();
SmallString<128> TargetName = getTriple(TargetNames[HostInputIndex]);
std::vector<StringRef> ClangArgs = {"clang",
"-r",
"-target",
TargetName.c_str(),
"-o",
OutputFileNames.front().c_str(),
InputFileNames[HostInputIndex].c_str(),
BitcodeFileName.c_str(),
"-nostdlib"};
// If the user asked for the commands to be printed out, we do that instead
// of executing it.
if (PrintExternalCommands) {
errs() << "\"" << ClangBinary.get() << "\"";
for (StringRef Arg : ClangArgs)
errs() << " \"" << Arg << "\"";
errs() << "\n";
} else {
// Write the bitcode contents to the temporary file.
{
std::error_code EC;
raw_fd_ostream BitcodeFile(BitcodeFileName, EC, sys::fs::F_None);
if (EC) {
errs() << "error: unable to open temporary file.\n";
return true;
}
WriteBitcodeToFile(*AuxModule, BitcodeFile);
}
bool Failed = sys::ExecuteAndWait(ClangBinary.get(), ClangArgs);
// Remove bitcode file.
sys::fs::remove(BitcodeFileName);
if (Failed) {
errs() << "error: incremental linking by external tool failed.\n";
return true;
}
}
return false;
}
void WriteBundle(raw_fd_ostream &OS, MemoryBuffer &Input) final {
Module *M = AuxModule.get();
// Create the new section name, it will consist of the reserved prefix
// concatenated with the triple.
std::string SectionName = OFFLOAD_BUNDLER_MAGIC_STR;
SectionName += CurrentTriple;
// Create the constant with the content of the section. For the input we are
// bundling into (the host input), this is just a place-holder, so a single
// byte is sufficient.
assert(HostInputIndex != ~0u && "Host input index undefined??");
Constant *Content;
if (NumberOfProcessedInputs == HostInputIndex + 1) {
uint8_t Byte[] = {0};
Content = ConstantDataArray::get(VMContext, Byte);
} else
Content = ConstantDataArray::get(
VMContext, ArrayRef<uint8_t>(reinterpret_cast<const uint8_t *>(
Input.getBufferStart()),
Input.getBufferSize()));
// Create the global in the desired section. We don't want these globals in
// the symbol table, so we mark them private.
auto *GV = new GlobalVariable(*M, Content->getType(), /*IsConstant=*/true,
GlobalVariable::PrivateLinkage, Content);
GV->setSection(SectionName);
}
};
/// 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:
void ReadHeader(MemoryBuffer &Input) final {}
StringRef ReadBundleStart(MemoryBuffer &Input) final {
StringRef FC = Input.getBuffer();
// Find start of the bundle.
ReadChars = FC.find(BundleStartString, ReadChars);
if (ReadChars == FC.npos)
return StringRef();
// 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 StringRef();
// Next time we read after the new line.
++ReadChars;
return StringRef(&FC.data()[TripleStart], TripleEnd - TripleStart);
}
void 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)
return;
// Next time we read after the new line.
++ReadChars;
}
void ReadBundle(raw_fd_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;
}
void WriteHeader(raw_fd_ostream &OS,
ArrayRef<std::unique_ptr<MemoryBuffer>> Inputs) final {}
void WriteBundleStart(raw_fd_ostream &OS, StringRef TargetTriple) final {
OS << BundleStartString << TargetTriple << "\n";
}
bool WriteBundleEnd(raw_fd_ostream &OS, StringRef TargetTriple) final {
OS << BundleEndString << TargetTriple << "\n";
return false;
}
void WriteBundle(raw_fd_ostream &OS, MemoryBuffer &Input) final {
OS << Input.getBuffer();
}
public:
TextFileHandler(StringRef Comment)
: FileHandler(), Comment(Comment), ReadChars(0) {
BundleStartString =
"\n" + Comment.str() + " " OFFLOAD_BUNDLER_MAGIC_STR "__START__ ";
BundleEndString =
"\n" + Comment.str() + " " OFFLOAD_BUNDLER_MAGIC_STR "__END__ ";
}
};
/// 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 FileHandler *CreateObjectFileHandler(MemoryBuffer &FirstInput) {
// Check if the input file format is one that we know how to deal with.
Expected<std::unique_ptr<Binary>> BinaryOrErr = createBinary(FirstInput);
// Failed to open the input as a known binary. Use the default binary handler.
if (!BinaryOrErr) {
// We don't really care about the error (we just consume it), if we could
// not get a valid device binary object we use the default binary handler.
consumeError(BinaryOrErr.takeError());
return new BinaryFileHandler();
}
// We only support regular object files. If this is not an object file,
// default to the binary handler. The handler will be owned by the client of
// this function.
std::unique_ptr<ObjectFile> Obj(
dyn_cast<ObjectFile>(BinaryOrErr.get().release()));
if (!Obj)
return new BinaryFileHandler();
return new ObjectFileHandler(std::move(Obj));
}
/// Return an appropriate handler given the input files and options.
static FileHandler *CreateFileHandler(MemoryBuffer &FirstInput) {
if (FilesType == "i")
return new TextFileHandler(/*Comment=*/"//");
if (FilesType == "ii")
return new TextFileHandler(/*Comment=*/"//");
if (FilesType == "ll")
return new TextFileHandler(/*Comment=*/";");
if (FilesType == "bc")
return new BinaryFileHandler();
if (FilesType == "s")
return new TextFileHandler(/*Comment=*/"#");
if (FilesType == "o")
return CreateObjectFileHandler(FirstInput);
if (FilesType == "gch")
return new BinaryFileHandler();
if (FilesType == "ast")
return new BinaryFileHandler();
errs() << "error: invalid file type specified.\n";
return nullptr;
}
/// Bundle the files. Return true if an error was found.
static bool BundleFiles() {
std::error_code EC;
// Create output file.
raw_fd_ostream OutputFile(OutputFileNames.front(), EC, sys::fs::F_None);
if (EC) {
errs() << "error: Can't open file " << OutputFileNames.front() << ".\n";
return true;
}
// Open input files.
std::vector<std::unique_ptr<MemoryBuffer>> InputBuffers(
InputFileNames.size());
unsigned Idx = 0;
for (auto &I : InputFileNames) {
ErrorOr<std::unique_ptr<MemoryBuffer>> CodeOrErr =
MemoryBuffer::getFileOrSTDIN(I);
if (std::error_code EC = CodeOrErr.getError()) {
errs() << "error: Can't open file " << I << ": " << EC.message() << "\n";
return true;
}
InputBuffers[Idx++] = std::move(CodeOrErr.get());
}
// Get the file handler. We use the host buffer as reference.
assert(HostInputIndex != ~0u && "Host input index undefined??");
std::unique_ptr<FileHandler> FH;
FH.reset(CreateFileHandler(*InputBuffers[HostInputIndex].get()));
// Quit if we don't have a handler.
if (!FH.get())
return true;
// Write header.
FH.get()->WriteHeader(OutputFile, InputBuffers);
// 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 : TargetNames) {
FH.get()->WriteBundleStart(OutputFile, Triple);
FH.get()->WriteBundle(OutputFile, *Input->get());
if (FH.get()->WriteBundleEnd(OutputFile, Triple))
return true;
++Input;
}
return false;
}
// Unbundle the files. Return true if an error was found.
static bool UnbundleFiles() {
// Open Input file.
ErrorOr<std::unique_ptr<MemoryBuffer>> CodeOrErr =
MemoryBuffer::getFileOrSTDIN(InputFileNames.front());
if (std::error_code EC = CodeOrErr.getError()) {
errs() << "error: Can't open file " << InputFileNames.front() << ": "
<< EC.message() << "\n";
return true;
}
MemoryBuffer &Input = *CodeOrErr.get();
// Select the right files handler.
std::unique_ptr<FileHandler> FH;
FH.reset(CreateFileHandler(Input));
// Quit if we don't have a handler.
if (!FH.get())
return true;
// Read the header of the bundled file.
FH.get()->ReadHeader(Input);
// Create a work list that consist of the map triple/output file.
StringMap<StringRef> Worklist;
auto Output = OutputFileNames.begin();
for (auto &Triple : 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()) {
StringRef CurTriple = FH.get()->ReadBundleStart(Input);
// We don't have more bundles.
if (CurTriple.empty())
break;
auto Output = Worklist.find(CurTriple);
// The file may have more bundles for other targets, that we don't care
// about. Therefore, move on to the next triple
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::F_None);
if (EC) {
errs() << "error: Can't open file " << Output->second << ": "
<< EC.message() << "\n";
return true;
}
FH.get()->ReadBundle(OutputFile, Input);
FH.get()->ReadBundleEnd(Input);
Worklist.erase(Output);
// Record if we found the host bundle.
if (hasHostKind(CurTriple))
FoundHostBundle = true;
}
// If no bundles were found, assume the input file is the host bundle and
// create empty files for the remaining targets.
if (Worklist.size() == TargetNames.size()) {
for (auto &E : Worklist) {
std::error_code EC;
raw_fd_ostream OutputFile(E.second, EC, sys::fs::F_None);
if (EC) {
errs() << "error: Can't open file " << E.second << ": " << EC.message()
<< "\n";
return true;
}
// If this entry has a host kind, copy the input file to the output file.
if (hasHostKind(E.first()))
OutputFile.write(Input.getBufferStart(), Input.getBufferSize());
}
return false;
}
// If we found elements, we emit an error if none of those were for the host.
if (!FoundHostBundle) {
errs() << "error: Can't find bundle for the host target\n";
return true;
}
// 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::F_None);
if (EC) {
errs() << "error: Can't open file " << E.second << ": " << EC.message()
<< "\n";
return true;
}
}
return false;
}
static void PrintVersion(raw_ostream &OS) {
OS << clang::getClangToolFullVersion("clang-offload-bundler") << '\n';
}
int main(int argc, const char **argv) {
sys::PrintStackTraceOnErrorSignal(argv[0]);
cl::HideUnrelatedOptions(ClangOffloadBundlerCategory);
cl::SetVersionPrinter(PrintVersion);
cl::ParseCommandLineOptions(
argc, argv,
"A tool to bundle several input files of the specified type <type> \n"
"referring to the same source file but different targets into a single \n"
"one. The resulting file can also be unbundled into different files by \n"
"this tool if -unbundle is provided.\n");
if (Help) {
cl::PrintHelpMessage();
return 0;
}
bool Error = false;
if (Unbundle) {
if (InputFileNames.size() != 1) {
Error = true;
errs() << "error: only one input file supported in unbundling mode.\n";
}
if (OutputFileNames.size() != TargetNames.size()) {
Error = true;
errs() << "error: number of output files and targets should match in "
"unbundling mode.\n";
}
} else {
if (OutputFileNames.size() != 1) {
Error = true;
errs() << "error: only one output file supported in bundling mode.\n";
}
if (InputFileNames.size() != TargetNames.size()) {
Error = true;
errs() << "error: number of input files and targets should match in "
"bundling mode.\n";
}
}
// Verify that the offload kinds and triples are known. We also check that we
// have exactly one host target.
unsigned Index = 0u;
unsigned HostTargetNum = 0u;
for (StringRef Target : TargetNames) {
StringRef Kind;
StringRef Triple;
getOffloadKindAndTriple(Target, Kind, Triple);
bool KindIsValid = !Kind.empty();
KindIsValid = KindIsValid && StringSwitch<bool>(Kind)
.Case("host", true)
.Case("openmp", true)
.Case("hip", true)
.Default(false);
bool TripleIsValid = !Triple.empty();
llvm::Triple T(Triple);
TripleIsValid &= T.getArch() != Triple::UnknownArch;
if (!KindIsValid || !TripleIsValid) {
Error = true;
errs() << "error: invalid target '" << Target << "'";
if (!KindIsValid)
errs() << ", unknown offloading kind '" << Kind << "'";
if (!TripleIsValid)
errs() << ", unknown target triple '" << Triple << "'";
errs() << ".\n";
}
if (KindIsValid && Kind == "host") {
++HostTargetNum;
// Save the index of the input that refers to the host.
HostInputIndex = Index;
}
++Index;
}
if (HostTargetNum != 1) {
Error = true;
errs() << "error: expecting exactly one host target but got "
<< HostTargetNum << ".\n";
}
if (Error)
return 1;
// Save the current executable directory as it will be useful to find other
// tools.
BundlerExecutable = sys::fs::getMainExecutable(argv[0], &BundlerExecutable);
return Unbundle ? UnbundleFiles() : BundleFiles();
}