forked from OSchip/llvm-project
412 lines
13 KiB
C++
412 lines
13 KiB
C++
//===-- 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/LTO/LTOCodeGenerator.h"
|
|
#include "llvm/LTO/LTOModule.h"
|
|
#include "llvm/Object/FunctionIndexObjectFile.h"
|
|
#include "llvm/Support/CommandLine.h"
|
|
#include "llvm/Support/FileSystem.h"
|
|
#include "llvm/Support/ManagedStatic.h"
|
|
#include "llvm/Support/PrettyStackTrace.h"
|
|
#include "llvm/Support/Signals.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"));
|
|
|
|
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("Symbol 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"));
|
|
|
|
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 diagnosticHandlerWithContenxt(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 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();
|
|
ErrorOr<std::unique_ptr<LTOModule>> Ret = LTOModule::createInLocalContext(
|
|
Buffer->getBufferStart(), Buffer->getBufferSize(), Options, Path);
|
|
CurrentActivity = "";
|
|
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 createCombinedFunctionIndex() {
|
|
FunctionInfoIndex CombinedIndex;
|
|
uint64_t NextModuleId = 0;
|
|
for (auto &Filename : InputFilenames) {
|
|
CurrentActivity = "loading file '" + Filename + "'";
|
|
ErrorOr<std::unique_ptr<FunctionInfoIndex>> IndexOrErr =
|
|
llvm::getFunctionIndexForFile(Filename, diagnosticHandler);
|
|
std::unique_ptr<FunctionInfoIndex> Index = std::move(IndexOrErr.get());
|
|
CurrentActivity = "";
|
|
// Skip files without a function 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'");
|
|
WriteFunctionSummaryToFile(CombinedIndex, OS);
|
|
OS.close();
|
|
}
|
|
|
|
int main(int argc, char **argv) {
|
|
// Print a stack trace if we signal out.
|
|
sys::PrintStackTraceOnErrorSignal();
|
|
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 (ThinLTO) {
|
|
createCombinedFunctionIndex();
|
|
return 0;
|
|
}
|
|
|
|
unsigned BaseArg = 0;
|
|
|
|
LLVMContext Context;
|
|
Context.setDiagnosticHandler(diagnosticHandlerWithContenxt, nullptr, true);
|
|
|
|
LTOCodeGenerator CodeGen(Context);
|
|
|
|
if (UseDiagnosticHandler)
|
|
CodeGen.setDiagnosticHandler(handleDiagnostics, nullptr);
|
|
|
|
CodeGen.setCodePICModel(RelocModel);
|
|
|
|
CodeGen.setDebugInfo(LTO_DEBUG_MODEL_DWARF);
|
|
CodeGen.setTargetOptions(Options);
|
|
|
|
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);
|
|
error(ModuleOrErr, "error " + CurrentActivity);
|
|
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.
|
|
errs() << argv[0] << ": error adding file '" << InputFilenames[i] << "'\n";
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
// 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.
|
|
errs() << argv[0] << ": error optimizing the code\n";
|
|
return 1;
|
|
}
|
|
|
|
if (SaveModuleFile) {
|
|
std::string ModuleFilename = OutputFilename;
|
|
ModuleFilename += ".merged.bc";
|
|
std::string ErrMsg;
|
|
|
|
if (!CodeGen.writeMergedModules(ModuleFilename.c_str())) {
|
|
errs() << argv[0] << ": writing merged module failed.\n";
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
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) {
|
|
errs() << argv[0] << ": error opening the file '" << PartFilename
|
|
<< "': " << EC.message() << "\n";
|
|
return 1;
|
|
}
|
|
OSPtrs.push_back(&OSs.back().os());
|
|
}
|
|
|
|
if (!CodeGen.compileOptimized(OSPtrs)) {
|
|
// Diagnostic messages should have been printed by the handler.
|
|
errs() << argv[0] << ": error compiling the code\n";
|
|
return 1;
|
|
}
|
|
|
|
for (tool_output_file &OS : OSs)
|
|
OS.keep();
|
|
} else {
|
|
if (Parallelism != 1) {
|
|
errs() << argv[0] << ": -j must be specified together with -o\n";
|
|
return 1;
|
|
}
|
|
|
|
if (SaveModuleFile) {
|
|
errs() << argv[0] << ": -save-merged-module must be specified with -o\n";
|
|
return 1;
|
|
}
|
|
|
|
const char *OutputName = nullptr;
|
|
if (!CodeGen.compile_to_file(&OutputName, DisableVerify, DisableInline,
|
|
DisableGVNLoadPRE, DisableLTOVectorization)) {
|
|
// Diagnostic messages should have been printed by the handler.
|
|
errs() << argv[0] << ": error compiling the code\n";
|
|
return 1;
|
|
}
|
|
|
|
outs() << "Wrote native object file '" << OutputName << "'\n";
|
|
}
|
|
|
|
return 0;
|
|
}
|