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llvm-mirror/tools/llvm-lto/llvm-lto.cpp
Ben Dunbobbin 33ef399ccf [ThinLTO]LTO]Legacy] Fix dependent libraries support by adding querying of the IRSymtab 
Dependent libraries support for the legacy api was committed in a
broken state (see: https://reviews.llvm.org/D60274). This was missed
due to the painful nature of having to integrate the changes into a
linker in order to test. This change implements support for dependent
libraries in the legacy LTO api:

- I have removed the current api function, which returns a single
string, and   added functions to access each dependent library
specifier individually.

- To reduce the testing pain, I have made the api functions as thin as
possible to   maximize coverage from llvm-lto.

- When doing ThinLTO the system linker will load the modules lazily
when scanning   the input files. Unfortunately, when modules are
lazily loaded there is no access   to module level named metadata. To
fix this I have added api functions that allow   querying the IRSymtab
for the dependent libraries. I hope to expand the api in the   future
so that, eventually, all the information needed by a client linker
during   scan can be retrieved from the IRSymtab.

Differential Revision: https://reviews.llvm.org/D62935

llvm-svn: 363140
2019-06-12 11:07:56 +00:00

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//===- llvm-lto: a simple command-line program to link modules with LTO ---===//
//
// 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 program takes in a list of bitcode files, links them, performs link-time
// optimization, and outputs an object file.
//
//===----------------------------------------------------------------------===//
#include "llvm-c/lto.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Bitcode/BitcodeReader.h"
#include "llvm/Bitcode/BitcodeWriter.h"
#include "llvm/CodeGen/CommandFlags.inc"
#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/IR/DiagnosticPrinter.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/ModuleSummaryIndex.h"
#include "llvm/IR/Verifier.h"
#include "llvm/IRReader/IRReader.h"
#include "llvm/LTO/legacy/LTOCodeGenerator.h"
#include "llvm/LTO/legacy/LTOModule.h"
#include "llvm/LTO/legacy/ThinLTOCodeGenerator.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/InitLLVM.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetOptions.h"
#include <algorithm>
#include <cassert>
#include <cstdint>
#include <cstdlib>
#include <list>
#include <map>
#include <memory>
#include <string>
#include <system_error>
#include <tuple>
#include <utility>
#include <vector>
using namespace llvm;
static cl::opt<char>
OptLevel("O", cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
"(default = '-O2')"),
cl::Prefix, cl::ZeroOrMore, cl::init('2'));
static cl::opt<bool>
IndexStats("thinlto-index-stats",
cl::desc("Print statistic for the index in every input files"),
cl::init(false));
static cl::opt<bool> DisableVerify(
"disable-verify", cl::init(false),
cl::desc("Do not run the verifier during the optimization pipeline"));
static cl::opt<bool> DisableInline("disable-inlining", cl::init(false),
cl::desc("Do not run the inliner pass"));
static cl::opt<bool>
DisableGVNLoadPRE("disable-gvn-loadpre", cl::init(false),
cl::desc("Do not run the GVN load PRE pass"));
static cl::opt<bool> DisableLTOVectorization(
"disable-lto-vectorization", cl::init(false),
cl::desc("Do not run loop or slp vectorization during LTO"));
static cl::opt<bool> EnableFreestanding(
"lto-freestanding", cl::init(false),
cl::desc("Enable Freestanding (disable builtins / TLI) during LTO"));
static cl::opt<bool> UseDiagnosticHandler(
"use-diagnostic-handler", cl::init(false),
cl::desc("Use a diagnostic handler to test the handler interface"));
static cl::opt<bool>
ThinLTO("thinlto", cl::init(false),
cl::desc("Only write combined global index for ThinLTO backends"));
enum ThinLTOModes {
THINLINK,
THINDISTRIBUTE,
THINEMITIMPORTS,
THINPROMOTE,
THINIMPORT,
THININTERNALIZE,
THINOPT,
THINCODEGEN,
THINALL
};
cl::opt<ThinLTOModes> ThinLTOMode(
"thinlto-action", cl::desc("Perform a single ThinLTO stage:"),
cl::values(
clEnumValN(
THINLINK, "thinlink",
"ThinLink: produces the index by linking only the summaries."),
clEnumValN(THINDISTRIBUTE, "distributedindexes",
"Produces individual indexes for distributed backends."),
clEnumValN(THINEMITIMPORTS, "emitimports",
"Emit imports files for distributed backends."),
clEnumValN(THINPROMOTE, "promote",
"Perform pre-import promotion (requires -thinlto-index)."),
clEnumValN(THINIMPORT, "import", "Perform both promotion and "
"cross-module importing (requires "
"-thinlto-index)."),
clEnumValN(THININTERNALIZE, "internalize",
"Perform internalization driven by -exported-symbol "
"(requires -thinlto-index)."),
clEnumValN(THINOPT, "optimize", "Perform ThinLTO optimizations."),
clEnumValN(THINCODEGEN, "codegen", "CodeGen (expected to match llc)"),
clEnumValN(THINALL, "run", "Perform ThinLTO end-to-end")));
static cl::opt<std::string>
ThinLTOIndex("thinlto-index",
cl::desc("Provide the index produced by a ThinLink, required "
"to perform the promotion and/or importing."));
static cl::opt<std::string> ThinLTOPrefixReplace(
"thinlto-prefix-replace",
cl::desc("Control where files for distributed backends are "
"created. Expects 'oldprefix;newprefix' and if path "
"prefix of output file is oldprefix it will be "
"replaced with newprefix."));
static cl::opt<std::string> ThinLTOModuleId(
"thinlto-module-id",
cl::desc("For the module ID for the file to process, useful to "
"match what is in the index."));
static cl::opt<std::string>
ThinLTOCacheDir("thinlto-cache-dir", cl::desc("Enable ThinLTO caching."));
static cl::opt<int>
ThinLTOCachePruningInterval("thinlto-cache-pruning-interval",
cl::init(1200), cl::desc("Set ThinLTO cache pruning interval."));
static cl::opt<uint64_t> ThinLTOCacheMaxSizeBytes(
"thinlto-cache-max-size-bytes",
cl::desc("Set ThinLTO cache pruning directory maximum size in bytes."));
static cl::opt<int>
ThinLTOCacheMaxSizeFiles("thinlto-cache-max-size-files", cl::init(1000000),
cl::desc("Set ThinLTO cache pruning directory maximum number of files."));
static cl::opt<unsigned>
ThinLTOCacheEntryExpiration("thinlto-cache-entry-expiration", cl::init(604800) /* 1w */,
cl::desc("Set ThinLTO cache entry expiration time."));
static cl::opt<std::string> ThinLTOSaveTempsPrefix(
"thinlto-save-temps",
cl::desc("Save ThinLTO temp files using filenames created by adding "
"suffixes to the given file path prefix."));
static cl::opt<std::string> ThinLTOGeneratedObjectsDir(
"thinlto-save-objects",
cl::desc("Save ThinLTO generated object files using filenames created in "
"the given directory."));
static cl::opt<bool>
SaveModuleFile("save-merged-module", cl::init(false),
cl::desc("Write merged LTO module to file before CodeGen"));
static cl::list<std::string> InputFilenames(cl::Positional, cl::OneOrMore,
cl::desc("<input bitcode files>"));
static cl::opt<std::string> OutputFilename("o", cl::init(""),
cl::desc("Override output filename"),
cl::value_desc("filename"));
static cl::list<std::string> ExportedSymbols(
"exported-symbol",
cl::desc("List of symbols to export from the resulting object file"),
cl::ZeroOrMore);
static cl::list<std::string>
DSOSymbols("dso-symbol",
cl::desc("Symbol to put in the symtab in the resulting dso"),
cl::ZeroOrMore);
static cl::opt<bool> ListSymbolsOnly(
"list-symbols-only", cl::init(false),
cl::desc("Instead of running LTO, list the symbols in each IR file"));
static cl::opt<bool> ListDependentLibrariesOnly(
"list-dependent-libraries-only", cl::init(false),
cl::desc("Instead of running LTO, list the dependent libraries in each IR file"));
static cl::opt<bool> SetMergedModule(
"set-merged-module", cl::init(false),
cl::desc("Use the first input module as the merged module"));
static cl::opt<unsigned> Parallelism("j", cl::Prefix, cl::init(1),
cl::desc("Number of backend threads"));
static cl::opt<bool> RestoreGlobalsLinkage(
"restore-linkage", cl::init(false),
cl::desc("Restore original linkage of globals prior to CodeGen"));
static cl::opt<bool> CheckHasObjC(
"check-for-objc", cl::init(false),
cl::desc("Only check if the module has objective-C defined in it"));
namespace {
struct ModuleInfo {
std::vector<bool> CanBeHidden;
};
} // end anonymous namespace
static void handleDiagnostics(lto_codegen_diagnostic_severity_t Severity,
const char *Msg, void *) {
errs() << "llvm-lto: ";
switch (Severity) {
case LTO_DS_NOTE:
errs() << "note: ";
break;
case LTO_DS_REMARK:
errs() << "remark: ";
break;
case LTO_DS_ERROR:
errs() << "error: ";
break;
case LTO_DS_WARNING:
errs() << "warning: ";
break;
}
errs() << Msg << "\n";
}
static std::string CurrentActivity;
namespace {
struct LLVMLTODiagnosticHandler : public DiagnosticHandler {
bool handleDiagnostics(const DiagnosticInfo &DI) override {
raw_ostream &OS = errs();
OS << "llvm-lto: ";
switch (DI.getSeverity()) {
case DS_Error:
OS << "error";
break;
case DS_Warning:
OS << "warning";
break;
case DS_Remark:
OS << "remark";
break;
case DS_Note:
OS << "note";
break;
}
if (!CurrentActivity.empty())
OS << ' ' << CurrentActivity;
OS << ": ";
DiagnosticPrinterRawOStream DP(OS);
DI.print(DP);
OS << '\n';
if (DI.getSeverity() == DS_Error)
exit(1);
return true;
}
};
}
static void error(const Twine &Msg) {
errs() << "llvm-lto: " << Msg << '\n';
exit(1);
}
static void error(std::error_code EC, const Twine &Prefix) {
if (EC)
error(Prefix + ": " + EC.message());
}
template <typename T>
static void error(const ErrorOr<T> &V, const Twine &Prefix) {
error(V.getError(), Prefix);
}
static void maybeVerifyModule(const Module &Mod) {
if (!DisableVerify && verifyModule(Mod, &errs()))
error("Broken Module");
}
static std::unique_ptr<LTOModule>
getLocalLTOModule(StringRef Path, std::unique_ptr<MemoryBuffer> &Buffer,
const TargetOptions &Options) {
ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
MemoryBuffer::getFile(Path);
error(BufferOrErr, "error loading file '" + Path + "'");
Buffer = std::move(BufferOrErr.get());
CurrentActivity = ("loading file '" + Path + "'").str();
std::unique_ptr<LLVMContext> Context = llvm::make_unique<LLVMContext>();
Context->setDiagnosticHandler(llvm::make_unique<LLVMLTODiagnosticHandler>(),
true);
ErrorOr<std::unique_ptr<LTOModule>> Ret = LTOModule::createInLocalContext(
std::move(Context), Buffer->getBufferStart(), Buffer->getBufferSize(),
Options, Path);
CurrentActivity = "";
maybeVerifyModule((*Ret)->getModule());
return std::move(*Ret);
}
/// Print some statistics on the index for each input files.
void printIndexStats() {
for (auto &Filename : InputFilenames) {
ExitOnError ExitOnErr("llvm-lto: error loading file '" + Filename + "': ");
std::unique_ptr<ModuleSummaryIndex> Index =
ExitOnErr(getModuleSummaryIndexForFile(Filename));
// Skip files without a module summary.
if (!Index)
report_fatal_error(Filename + " does not contain an index");
unsigned Calls = 0, Refs = 0, Functions = 0, Alias = 0, Globals = 0;
for (auto &Summaries : *Index) {
for (auto &Summary : Summaries.second.SummaryList) {
Refs += Summary->refs().size();
if (auto *FuncSummary = dyn_cast<FunctionSummary>(Summary.get())) {
Functions++;
Calls += FuncSummary->calls().size();
} else if (isa<AliasSummary>(Summary.get()))
Alias++;
else
Globals++;
}
}
outs() << "Index " << Filename << " contains "
<< (Alias + Globals + Functions) << " nodes (" << Functions
<< " functions, " << Alias << " alias, " << Globals
<< " globals) and " << (Calls + Refs) << " edges (" << Refs
<< " refs and " << Calls << " calls)\n";
}
}
/// List symbols in each IR file.
///
/// The main point here is to provide lit-testable coverage for the LTOModule
/// functionality that's exposed by the C API to list symbols. Moreover, this
/// provides testing coverage for modules that have been created in their own
/// contexts.
static void listSymbols(const TargetOptions &Options) {
for (auto &Filename : InputFilenames) {
std::unique_ptr<MemoryBuffer> Buffer;
std::unique_ptr<LTOModule> Module =
getLocalLTOModule(Filename, Buffer, Options);
// List the symbols.
outs() << Filename << ":\n";
for (int I = 0, E = Module->getSymbolCount(); I != E; ++I)
outs() << Module->getSymbolName(I) << "\n";
}
}
static std::unique_ptr<MemoryBuffer> loadFile(StringRef Filename) {
ExitOnError ExitOnErr("llvm-lto: error loading file '" + Filename.str() +
"': ");
return ExitOnErr(errorOrToExpected(MemoryBuffer::getFileOrSTDIN(Filename)));
}
static void listDependentLibraries() {
for (auto &Filename : InputFilenames) {
auto Buffer = loadFile(Filename);
std::string E;
std::unique_ptr<lto::InputFile> Input(LTOModule::createInputFile(
Buffer->getBufferStart(), Buffer->getBufferSize(), Filename.c_str(),
E));
if (!Input)
error(E);
// List the dependent libraries.
outs() << Filename << ":\n";
for (size_t I = 0, C = LTOModule::getDependentLibraryCount(Input.get());
I != C; ++I) {
size_t L = 0;
const char *S = LTOModule::getDependentLibrary(Input.get(), I, &L);
assert(S);
outs() << StringRef(S, L) << "\n";
}
}
}
/// Create a combined index file from the input IR files and write it.
///
/// This is meant to enable testing of ThinLTO combined index generation,
/// currently available via the gold plugin via -thinlto.
static void createCombinedModuleSummaryIndex() {
ModuleSummaryIndex CombinedIndex(/*HaveGVs=*/false);
uint64_t NextModuleId = 0;
for (auto &Filename : InputFilenames) {
ExitOnError ExitOnErr("llvm-lto: error loading file '" + Filename + "': ");
std::unique_ptr<MemoryBuffer> MB =
ExitOnErr(errorOrToExpected(MemoryBuffer::getFileOrSTDIN(Filename)));
ExitOnErr(readModuleSummaryIndex(*MB, CombinedIndex, NextModuleId++));
}
std::error_code EC;
assert(!OutputFilename.empty());
raw_fd_ostream OS(OutputFilename + ".thinlto.bc", EC,
sys::fs::OpenFlags::F_None);
error(EC, "error opening the file '" + OutputFilename + ".thinlto.bc'");
WriteIndexToFile(CombinedIndex, OS);
OS.close();
}
/// Parse the thinlto_prefix_replace option into the \p OldPrefix and
/// \p NewPrefix strings, if it was specified.
static void getThinLTOOldAndNewPrefix(std::string &OldPrefix,
std::string &NewPrefix) {
assert(ThinLTOPrefixReplace.empty() ||
ThinLTOPrefixReplace.find(";") != StringRef::npos);
StringRef PrefixReplace = ThinLTOPrefixReplace;
std::pair<StringRef, StringRef> Split = PrefixReplace.split(";");
OldPrefix = Split.first.str();
NewPrefix = Split.second.str();
}
/// Given the original \p Path to an output file, replace any path
/// prefix matching \p OldPrefix with \p NewPrefix. Also, create the
/// resulting directory if it does not yet exist.
static std::string getThinLTOOutputFile(const std::string &Path,
const std::string &OldPrefix,
const std::string &NewPrefix) {
if (OldPrefix.empty() && NewPrefix.empty())
return Path;
SmallString<128> NewPath(Path);
llvm::sys::path::replace_path_prefix(NewPath, OldPrefix, NewPrefix);
StringRef ParentPath = llvm::sys::path::parent_path(NewPath.str());
if (!ParentPath.empty()) {
// Make sure the new directory exists, creating it if necessary.
if (std::error_code EC = llvm::sys::fs::create_directories(ParentPath))
error(EC, "error creating the directory '" + ParentPath + "'");
}
return NewPath.str();
}
namespace thinlto {
std::vector<std::unique_ptr<MemoryBuffer>>
loadAllFilesForIndex(const ModuleSummaryIndex &Index) {
std::vector<std::unique_ptr<MemoryBuffer>> InputBuffers;
for (auto &ModPath : Index.modulePaths()) {
const auto &Filename = ModPath.first();
std::string CurrentActivity = ("loading file '" + Filename + "'").str();
auto InputOrErr = MemoryBuffer::getFile(Filename);
error(InputOrErr, "error " + CurrentActivity);
InputBuffers.push_back(std::move(*InputOrErr));
}
return InputBuffers;
}
std::unique_ptr<ModuleSummaryIndex> loadCombinedIndex() {
if (ThinLTOIndex.empty())
report_fatal_error("Missing -thinlto-index for ThinLTO promotion stage");
ExitOnError ExitOnErr("llvm-lto: error loading file '" + ThinLTOIndex +
"': ");
return ExitOnErr(getModuleSummaryIndexForFile(ThinLTOIndex));
}
static std::unique_ptr<lto::InputFile> loadInputFile(MemoryBufferRef Buffer) {
ExitOnError ExitOnErr("llvm-lto: error loading input '" +
Buffer.getBufferIdentifier().str() + "': ");
return ExitOnErr(lto::InputFile::create(Buffer));
}
static std::unique_ptr<Module> loadModuleFromInput(lto::InputFile &File,
LLVMContext &CTX) {
auto &Mod = File.getSingleBitcodeModule();
auto ModuleOrErr = Mod.parseModule(CTX);
if (!ModuleOrErr) {
handleAllErrors(ModuleOrErr.takeError(), [&](ErrorInfoBase &EIB) {
SMDiagnostic Err = SMDiagnostic(Mod.getModuleIdentifier(),
SourceMgr::DK_Error, EIB.message());
Err.print("llvm-lto", errs());
});
report_fatal_error("Can't load module, abort.");
}
maybeVerifyModule(**ModuleOrErr);
if (ThinLTOModuleId.getNumOccurrences()) {
if (InputFilenames.size() != 1)
report_fatal_error("Can't override the module id for multiple files");
(*ModuleOrErr)->setModuleIdentifier(ThinLTOModuleId);
}
return std::move(*ModuleOrErr);
}
static void writeModuleToFile(Module &TheModule, StringRef Filename) {
std::error_code EC;
raw_fd_ostream OS(Filename, EC, sys::fs::OpenFlags::F_None);
error(EC, "error opening the file '" + Filename + "'");
maybeVerifyModule(TheModule);
WriteBitcodeToFile(TheModule, OS, /* ShouldPreserveUseListOrder */ true);
}
class ThinLTOProcessing {
public:
ThinLTOCodeGenerator ThinGenerator;
ThinLTOProcessing(const TargetOptions &Options) {
ThinGenerator.setCodePICModel(getRelocModel());
ThinGenerator.setTargetOptions(Options);
ThinGenerator.setCacheDir(ThinLTOCacheDir);
ThinGenerator.setCachePruningInterval(ThinLTOCachePruningInterval);
ThinGenerator.setCacheEntryExpiration(ThinLTOCacheEntryExpiration);
ThinGenerator.setCacheMaxSizeFiles(ThinLTOCacheMaxSizeFiles);
ThinGenerator.setCacheMaxSizeBytes(ThinLTOCacheMaxSizeBytes);
ThinGenerator.setFreestanding(EnableFreestanding);
// Add all the exported symbols to the table of symbols to preserve.
for (unsigned i = 0; i < ExportedSymbols.size(); ++i)
ThinGenerator.preserveSymbol(ExportedSymbols[i]);
}
void run() {
switch (ThinLTOMode) {
case THINLINK:
return thinLink();
case THINDISTRIBUTE:
return distributedIndexes();
case THINEMITIMPORTS:
return emitImports();
case THINPROMOTE:
return promote();
case THINIMPORT:
return import();
case THININTERNALIZE:
return internalize();
case THINOPT:
return optimize();
case THINCODEGEN:
return codegen();
case THINALL:
return runAll();
}
}
private:
/// Load the input files, create the combined index, and write it out.
void thinLink() {
// Perform "ThinLink": just produce the index
if (OutputFilename.empty())
report_fatal_error(
"OutputFilename is necessary to store the combined index.\n");
LLVMContext Ctx;
std::vector<std::unique_ptr<MemoryBuffer>> InputBuffers;
for (unsigned i = 0; i < InputFilenames.size(); ++i) {
auto &Filename = InputFilenames[i];
std::string CurrentActivity = "loading file '" + Filename + "'";
auto InputOrErr = MemoryBuffer::getFile(Filename);
error(InputOrErr, "error " + CurrentActivity);
InputBuffers.push_back(std::move(*InputOrErr));
ThinGenerator.addModule(Filename, InputBuffers.back()->getBuffer());
}
auto CombinedIndex = ThinGenerator.linkCombinedIndex();
if (!CombinedIndex)
report_fatal_error("ThinLink didn't create an index");
std::error_code EC;
raw_fd_ostream OS(OutputFilename, EC, sys::fs::OpenFlags::F_None);
error(EC, "error opening the file '" + OutputFilename + "'");
WriteIndexToFile(*CombinedIndex, OS);
}
/// Load the combined index from disk, then compute and generate
/// individual index files suitable for ThinLTO distributed backend builds
/// on the files mentioned on the command line (these must match the index
/// content).
void distributedIndexes() {
if (InputFilenames.size() != 1 && !OutputFilename.empty())
report_fatal_error("Can't handle a single output filename and multiple "
"input files, do not provide an output filename and "
"the output files will be suffixed from the input "
"ones.");
std::string OldPrefix, NewPrefix;
getThinLTOOldAndNewPrefix(OldPrefix, NewPrefix);
auto Index = loadCombinedIndex();
for (auto &Filename : InputFilenames) {
LLVMContext Ctx;
auto Buffer = loadFile(Filename);
auto Input = loadInputFile(Buffer->getMemBufferRef());
auto TheModule = loadModuleFromInput(*Input, Ctx);
// Build a map of module to the GUIDs and summary objects that should
// be written to its index.
std::map<std::string, GVSummaryMapTy> ModuleToSummariesForIndex;
ThinGenerator.gatherImportedSummariesForModule(
*TheModule, *Index, ModuleToSummariesForIndex, *Input);
std::string OutputName = OutputFilename;
if (OutputName.empty()) {
OutputName = Filename + ".thinlto.bc";
}
OutputName = getThinLTOOutputFile(OutputName, OldPrefix, NewPrefix);
std::error_code EC;
raw_fd_ostream OS(OutputName, EC, sys::fs::OpenFlags::F_None);
error(EC, "error opening the file '" + OutputName + "'");
WriteIndexToFile(*Index, OS, &ModuleToSummariesForIndex);
}
}
/// Load the combined index from disk, compute the imports, and emit
/// the import file lists for each module to disk.
void emitImports() {
if (InputFilenames.size() != 1 && !OutputFilename.empty())
report_fatal_error("Can't handle a single output filename and multiple "
"input files, do not provide an output filename and "
"the output files will be suffixed from the input "
"ones.");
std::string OldPrefix, NewPrefix;
getThinLTOOldAndNewPrefix(OldPrefix, NewPrefix);
auto Index = loadCombinedIndex();
for (auto &Filename : InputFilenames) {
LLVMContext Ctx;
auto Buffer = loadFile(Filename);
auto Input = loadInputFile(Buffer->getMemBufferRef());
auto TheModule = loadModuleFromInput(*Input, Ctx);
std::string OutputName = OutputFilename;
if (OutputName.empty()) {
OutputName = Filename + ".imports";
}
OutputName =
getThinLTOOutputFile(OutputName, OldPrefix, NewPrefix);
ThinGenerator.emitImports(*TheModule, OutputName, *Index, *Input);
}
}
/// Load the combined index from disk, then load every file referenced by
/// the index and add them to the generator, finally perform the promotion
/// on the files mentioned on the command line (these must match the index
/// content).
void promote() {
if (InputFilenames.size() != 1 && !OutputFilename.empty())
report_fatal_error("Can't handle a single output filename and multiple "
"input files, do not provide an output filename and "
"the output files will be suffixed from the input "
"ones.");
auto Index = loadCombinedIndex();
for (auto &Filename : InputFilenames) {
LLVMContext Ctx;
auto Buffer = loadFile(Filename);
auto Input = loadInputFile(Buffer->getMemBufferRef());
auto TheModule = loadModuleFromInput(*Input, Ctx);
ThinGenerator.promote(*TheModule, *Index, *Input);
std::string OutputName = OutputFilename;
if (OutputName.empty()) {
OutputName = Filename + ".thinlto.promoted.bc";
}
writeModuleToFile(*TheModule, OutputName);
}
}
/// Load the combined index from disk, then load every file referenced by
/// the index and add them to the generator, then performs the promotion and
/// cross module importing on the files mentioned on the command line
/// (these must match the index content).
void import() {
if (InputFilenames.size() != 1 && !OutputFilename.empty())
report_fatal_error("Can't handle a single output filename and multiple "
"input files, do not provide an output filename and "
"the output files will be suffixed from the input "
"ones.");
auto Index = loadCombinedIndex();
auto InputBuffers = loadAllFilesForIndex(*Index);
for (auto &MemBuffer : InputBuffers)
ThinGenerator.addModule(MemBuffer->getBufferIdentifier(),
MemBuffer->getBuffer());
for (auto &Filename : InputFilenames) {
LLVMContext Ctx;
auto Buffer = loadFile(Filename);
auto Input = loadInputFile(Buffer->getMemBufferRef());
auto TheModule = loadModuleFromInput(*Input, Ctx);
ThinGenerator.crossModuleImport(*TheModule, *Index, *Input);
std::string OutputName = OutputFilename;
if (OutputName.empty()) {
OutputName = Filename + ".thinlto.imported.bc";
}
writeModuleToFile(*TheModule, OutputName);
}
}
void internalize() {
if (InputFilenames.size() != 1 && !OutputFilename.empty())
report_fatal_error("Can't handle a single output filename and multiple "
"input files, do not provide an output filename and "
"the output files will be suffixed from the input "
"ones.");
if (ExportedSymbols.empty())
errs() << "Warning: -internalize will not perform without "
"-exported-symbol\n";
auto Index = loadCombinedIndex();
auto InputBuffers = loadAllFilesForIndex(*Index);
for (auto &MemBuffer : InputBuffers)
ThinGenerator.addModule(MemBuffer->getBufferIdentifier(),
MemBuffer->getBuffer());
for (auto &Filename : InputFilenames) {
LLVMContext Ctx;
auto Buffer = loadFile(Filename);
auto Input = loadInputFile(Buffer->getMemBufferRef());
auto TheModule = loadModuleFromInput(*Input, Ctx);
ThinGenerator.internalize(*TheModule, *Index, *Input);
std::string OutputName = OutputFilename;
if (OutputName.empty()) {
OutputName = Filename + ".thinlto.internalized.bc";
}
writeModuleToFile(*TheModule, OutputName);
}
}
void optimize() {
if (InputFilenames.size() != 1 && !OutputFilename.empty())
report_fatal_error("Can't handle a single output filename and multiple "
"input files, do not provide an output filename and "
"the output files will be suffixed from the input "
"ones.");
if (!ThinLTOIndex.empty())
errs() << "Warning: -thinlto-index ignored for optimize stage";
for (auto &Filename : InputFilenames) {
LLVMContext Ctx;
auto Buffer = loadFile(Filename);
auto Input = loadInputFile(Buffer->getMemBufferRef());
auto TheModule = loadModuleFromInput(*Input, Ctx);
ThinGenerator.optimize(*TheModule);
std::string OutputName = OutputFilename;
if (OutputName.empty()) {
OutputName = Filename + ".thinlto.imported.bc";
}
writeModuleToFile(*TheModule, OutputName);
}
}
void codegen() {
if (InputFilenames.size() != 1 && !OutputFilename.empty())
report_fatal_error("Can't handle a single output filename and multiple "
"input files, do not provide an output filename and "
"the output files will be suffixed from the input "
"ones.");
if (!ThinLTOIndex.empty())
errs() << "Warning: -thinlto-index ignored for codegen stage";
std::vector<std::unique_ptr<MemoryBuffer>> InputBuffers;
for (auto &Filename : InputFilenames) {
LLVMContext Ctx;
auto InputOrErr = MemoryBuffer::getFile(Filename);
error(InputOrErr, "error " + CurrentActivity);
InputBuffers.push_back(std::move(*InputOrErr));
ThinGenerator.addModule(Filename, InputBuffers.back()->getBuffer());
}
ThinGenerator.setCodeGenOnly(true);
ThinGenerator.run();
for (auto BinName :
zip(ThinGenerator.getProducedBinaries(), InputFilenames)) {
std::string OutputName = OutputFilename;
if (OutputName.empty())
OutputName = std::get<1>(BinName) + ".thinlto.o";
else if (OutputName == "-") {
outs() << std::get<0>(BinName)->getBuffer();
return;
}
std::error_code EC;
raw_fd_ostream OS(OutputName, EC, sys::fs::OpenFlags::F_None);
error(EC, "error opening the file '" + OutputName + "'");
OS << std::get<0>(BinName)->getBuffer();
}
}
/// Full ThinLTO process
void runAll() {
if (!OutputFilename.empty())
report_fatal_error("Do not provide an output filename for ThinLTO "
" processing, the output files will be suffixed from "
"the input ones.");
if (!ThinLTOIndex.empty())
errs() << "Warning: -thinlto-index ignored for full ThinLTO process";
LLVMContext Ctx;
std::vector<std::unique_ptr<MemoryBuffer>> InputBuffers;
for (unsigned i = 0; i < InputFilenames.size(); ++i) {
auto &Filename = InputFilenames[i];
std::string CurrentActivity = "loading file '" + Filename + "'";
auto InputOrErr = MemoryBuffer::getFile(Filename);
error(InputOrErr, "error " + CurrentActivity);
InputBuffers.push_back(std::move(*InputOrErr));
ThinGenerator.addModule(Filename, InputBuffers.back()->getBuffer());
}
if (!ThinLTOSaveTempsPrefix.empty())
ThinGenerator.setSaveTempsDir(ThinLTOSaveTempsPrefix);
if (!ThinLTOGeneratedObjectsDir.empty()) {
ThinGenerator.setGeneratedObjectsDirectory(ThinLTOGeneratedObjectsDir);
ThinGenerator.run();
return;
}
ThinGenerator.run();
auto &Binaries = ThinGenerator.getProducedBinaries();
if (Binaries.size() != InputFilenames.size())
report_fatal_error("Number of output objects does not match the number "
"of inputs");
for (unsigned BufID = 0; BufID < Binaries.size(); ++BufID) {
auto OutputName = InputFilenames[BufID] + ".thinlto.o";
std::error_code EC;
raw_fd_ostream OS(OutputName, EC, sys::fs::OpenFlags::F_None);
error(EC, "error opening the file '" + OutputName + "'");
OS << Binaries[BufID]->getBuffer();
}
}
/// Load the combined index from disk, then load every file referenced by
};
} // end namespace thinlto
int main(int argc, char **argv) {
InitLLVM X(argc, argv);
cl::ParseCommandLineOptions(argc, argv, "llvm LTO linker\n");
if (OptLevel < '0' || OptLevel > '3')
error("optimization level must be between 0 and 3");
// Initialize the configured targets.
InitializeAllTargets();
InitializeAllTargetMCs();
InitializeAllAsmPrinters();
InitializeAllAsmParsers();
// set up the TargetOptions for the machine
TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
if (ListSymbolsOnly) {
listSymbols(Options);
return 0;
}
if (ListDependentLibrariesOnly) {
listDependentLibraries();
return 0;
}
if (IndexStats) {
printIndexStats();
return 0;
}
if (CheckHasObjC) {
for (auto &Filename : InputFilenames) {
ExitOnError ExitOnErr(std::string(*argv) + ": error loading file '" +
Filename + "': ");
std::unique_ptr<MemoryBuffer> BufferOrErr =
ExitOnErr(errorOrToExpected(MemoryBuffer::getFile(Filename)));
auto Buffer = std::move(BufferOrErr.get());
if (ExitOnErr(isBitcodeContainingObjCCategory(*Buffer)))
outs() << "Bitcode " << Filename << " contains ObjC\n";
else
outs() << "Bitcode " << Filename << " does not contain ObjC\n";
}
return 0;
}
if (ThinLTOMode.getNumOccurrences()) {
if (ThinLTOMode.getNumOccurrences() > 1)
report_fatal_error("You can't specify more than one -thinlto-action");
thinlto::ThinLTOProcessing ThinLTOProcessor(Options);
ThinLTOProcessor.run();
return 0;
}
if (ThinLTO) {
createCombinedModuleSummaryIndex();
return 0;
}
unsigned BaseArg = 0;
LLVMContext Context;
Context.setDiagnosticHandler(llvm::make_unique<LLVMLTODiagnosticHandler>(),
true);
LTOCodeGenerator CodeGen(Context);
if (UseDiagnosticHandler)
CodeGen.setDiagnosticHandler(handleDiagnostics, nullptr);
CodeGen.setCodePICModel(getRelocModel());
CodeGen.setFreestanding(EnableFreestanding);
CodeGen.setDebugInfo(LTO_DEBUG_MODEL_DWARF);
CodeGen.setTargetOptions(Options);
CodeGen.setShouldRestoreGlobalsLinkage(RestoreGlobalsLinkage);
StringSet<MallocAllocator> DSOSymbolsSet;
for (unsigned i = 0; i < DSOSymbols.size(); ++i)
DSOSymbolsSet.insert(DSOSymbols[i]);
std::vector<std::string> KeptDSOSyms;
for (unsigned i = BaseArg; i < InputFilenames.size(); ++i) {
CurrentActivity = "loading file '" + InputFilenames[i] + "'";
ErrorOr<std::unique_ptr<LTOModule>> ModuleOrErr =
LTOModule::createFromFile(Context, InputFilenames[i], Options);
std::unique_ptr<LTOModule> &Module = *ModuleOrErr;
CurrentActivity = "";
unsigned NumSyms = Module->getSymbolCount();
for (unsigned I = 0; I < NumSyms; ++I) {
StringRef Name = Module->getSymbolName(I);
if (!DSOSymbolsSet.count(Name))
continue;
lto_symbol_attributes Attrs = Module->getSymbolAttributes(I);
unsigned Scope = Attrs & LTO_SYMBOL_SCOPE_MASK;
if (Scope != LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN)
KeptDSOSyms.push_back(Name);
}
// We use the first input module as the destination module when
// SetMergedModule is true.
if (SetMergedModule && i == BaseArg) {
// Transfer ownership to the code generator.
CodeGen.setModule(std::move(Module));
} else if (!CodeGen.addModule(Module.get())) {
// Print a message here so that we know addModule() did not abort.
error("error adding file '" + InputFilenames[i] + "'");
}
}
// Add all the exported symbols to the table of symbols to preserve.
for (unsigned i = 0; i < ExportedSymbols.size(); ++i)
CodeGen.addMustPreserveSymbol(ExportedSymbols[i]);
// Add all the dso symbols to the table of symbols to expose.
for (unsigned i = 0; i < KeptDSOSyms.size(); ++i)
CodeGen.addMustPreserveSymbol(KeptDSOSyms[i]);
// Set cpu and attrs strings for the default target/subtarget.
CodeGen.setCpu(MCPU.c_str());
CodeGen.setOptLevel(OptLevel - '0');
std::string attrs;
for (unsigned i = 0; i < MAttrs.size(); ++i) {
if (i > 0)
attrs.append(",");
attrs.append(MAttrs[i]);
}
if (!attrs.empty())
CodeGen.setAttr(attrs);
if (FileType.getNumOccurrences())
CodeGen.setFileType(FileType);
if (!OutputFilename.empty()) {
if (!CodeGen.optimize(DisableVerify, DisableInline, DisableGVNLoadPRE,
DisableLTOVectorization)) {
// Diagnostic messages should have been printed by the handler.
error("error optimizing the code");
}
if (SaveModuleFile) {
std::string ModuleFilename = OutputFilename;
ModuleFilename += ".merged.bc";
std::string ErrMsg;
if (!CodeGen.writeMergedModules(ModuleFilename))
error("writing merged module failed.");
}
std::list<ToolOutputFile> OSs;
std::vector<raw_pwrite_stream *> OSPtrs;
for (unsigned I = 0; I != Parallelism; ++I) {
std::string PartFilename = OutputFilename;
if (Parallelism != 1)
PartFilename += "." + utostr(I);
std::error_code EC;
OSs.emplace_back(PartFilename, EC, sys::fs::F_None);
if (EC)
error("error opening the file '" + PartFilename + "': " + EC.message());
OSPtrs.push_back(&OSs.back().os());
}
if (!CodeGen.compileOptimized(OSPtrs))
// Diagnostic messages should have been printed by the handler.
error("error compiling the code");
for (ToolOutputFile &OS : OSs)
OS.keep();
} else {
if (Parallelism != 1)
error("-j must be specified together with -o");
if (SaveModuleFile)
error(": -save-merged-module must be specified with -o");
const char *OutputName = nullptr;
if (!CodeGen.compile_to_file(&OutputName, DisableVerify, DisableInline,
DisableGVNLoadPRE, DisableLTOVectorization))
error("error compiling the code");
// Diagnostic messages should have been printed by the handler.
outs() << "Wrote native object file '" << OutputName << "'\n";
}
return 0;
}
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