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llvm-project/llvm/tools/llvm-lto/llvm-lto.cpp

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//===-- llvm-lto: a simple command-line program to link modules with LTO --===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This program takes in a list of bitcode files, links them, performs link-time
// optimization, and outputs an object file.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/StringSet.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/CodeGen/CommandFlags.h"
#include "llvm/IR/DiagnosticPrinter.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Verifier.h"
#include "llvm/IRReader/IRReader.h"
#include "llvm/LTO/LTOCodeGenerator.h"
#include "llvm/LTO/LTOModule.h"
#include "llvm/LTO/ThinLTOCodeGenerator.h"
#include "llvm/Object/ModuleSummaryIndexObjectFile.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/raw_ostream.h"
#include <list>
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> 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> 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"),
clEnumValEnd));
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<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> 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"));
namespace {
struct ModuleInfo {
std::vector<bool> CanBeHidden;
};
}
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;
static void diagnosticHandler(const DiagnosticInfo &DI) {
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);
}
static void diagnosticHandlerWithContext(const DiagnosticInfo &DI,
void *Context) {
diagnosticHandler(DI);
}
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))
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(diagnosticHandlerWithContext, nullptr, 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);
}
/// \brief 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";
}
}
/// 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;
uint64_t NextModuleId = 0;
for (auto &Filename : InputFilenames) {
CurrentActivity = "loading file '" + Filename + "'";
ErrorOr<std::unique_ptr<ModuleSummaryIndex>> IndexOrErr =
llvm::getModuleSummaryIndexForFile(Filename, diagnosticHandler);
error(IndexOrErr, "error " + CurrentActivity);
std::unique_ptr<ModuleSummaryIndex> Index = std::move(IndexOrErr.get());
CurrentActivity = "";
// Skip files without a module summary.
if (!Index)
continue;
CombinedIndex.mergeFrom(std::move(Index), ++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();
auto CurrentActivity = "loading file '" + Filename + "'";
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");
auto CurrentActivity = "loading file '" + ThinLTOIndex + "'";
ErrorOr<std::unique_ptr<ModuleSummaryIndex>> IndexOrErr =
llvm::getModuleSummaryIndexForFile(ThinLTOIndex, diagnosticHandler);
error(IndexOrErr, "error " + CurrentActivity);
return std::move(IndexOrErr.get());
}
static std::unique_ptr<Module> loadModule(StringRef Filename,
LLVMContext &Ctx) {
SMDiagnostic Err;
std::unique_ptr<Module> M(parseIRFile(Filename, Err, Ctx));
if (!M) {
Err.print("llvm-lto", errs());
report_fatal_error("Can't load module for file " + Filename);
}
maybeVerifyModule(*M);
if (ThinLTOModuleId.getNumOccurrences()) {
if (InputFilenames.size() != 1)
report_fatal_error("Can't override the module id for multiple files");
M->setModuleIdentifier(ThinLTOModuleId);
}
return M;
}
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);
// 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];
StringRef 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();
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);
return;
}
/// 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) {
// Build a map of module to the GUIDs and summary objects that should
// be written to its index.
std::map<std::string, GVSummaryMapTy> ModuleToSummariesForIndex;
ThinLTOCodeGenerator::gatherImportedSummariesForModule(
Filename, *Index, ModuleToSummariesForIndex);
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) {
std::string OutputName = OutputFilename;
if (OutputName.empty()) {
OutputName = Filename + ".imports";
}
OutputName = getThinLTOOutputFile(OutputName, OldPrefix, NewPrefix);
ThinLTOCodeGenerator::emitImports(Filename, OutputName, *Index);
}
}
/// 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 TheModule = loadModule(Filename, Ctx);
ThinGenerator.promote(*TheModule, *Index);
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 TheModule = loadModule(Filename, Ctx);
ThinGenerator.crossModuleImport(*TheModule, *Index);
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 TheModule = loadModule(Filename, Ctx);
ThinGenerator.internalize(*TheModule, *Index);
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 TheModule = loadModule(Filename, 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";
for (auto &Filename : InputFilenames) {
LLVMContext Ctx;
auto TheModule = loadModule(Filename, Ctx);
auto Buffer = ThinGenerator.codegen(*TheModule);
std::string OutputName = OutputFilename;
if (OutputName.empty()) {
OutputName = Filename + ".thinlto.o";
}
if (OutputName == "-") {
outs() << Buffer->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 << Buffer->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];
StringRef 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());
}
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
};
} // namespace thinlto
int main(int argc, char **argv) {
// Print a stack trace if we signal out.
sys::PrintStackTraceOnErrorSignal(argv[0]);
PrettyStackTraceProgram X(argc, argv);
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
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 (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(diagnosticHandlerWithContext, nullptr, true);
LTOCodeGenerator CodeGen(Context);
if (UseDiagnosticHandler)
CodeGen.setDiagnosticHandler(handleDiagnostics, nullptr);
CodeGen.setCodePICModel(getRelocModel());
CodeGen.setDebugInfo(LTO_DEBUG_MODEL_DWARF);
CodeGen.setTargetOptions(Options);
CodeGen.setShouldRestoreGlobalsLinkage(RestoreGlobalsLinkage);
llvm::StringSet<llvm::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].c_str(), 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].c_str());
// Add all the dso symbols to the table of symbols to expose.
for (unsigned i = 0; i < KeptDSOSyms.size(); ++i)
CodeGen.addMustPreserveSymbol(KeptDSOSyms[i].c_str());
// 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.c_str());
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.c_str()))
error("writing merged module failed.");
}
std::list<tool_output_file> 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 (tool_output_file &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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