forked from OSchip/llvm-project
306 lines
9.5 KiB
C++
306 lines
9.5 KiB
C++
//===-- llvm-lto: a simple command-line program to link modules with LTO --===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This program takes in a list of bitcode files, links them, performs link-time
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// optimization, and outputs an object file.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/StringSet.h"
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#include "llvm/CodeGen/CommandFlags.h"
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#include "llvm/LTO/LTOCodeGenerator.h"
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#include "llvm/LTO/LTOModule.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/PrettyStackTrace.h"
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#include "llvm/Support/Signals.h"
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#include "llvm/Support/TargetSelect.h"
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#include "llvm/Support/ToolOutputFile.h"
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#include "llvm/Support/raw_ostream.h"
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#include <list>
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using namespace llvm;
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static cl::opt<char>
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OptLevel("O",
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cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
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"(default = '-O2')"),
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cl::Prefix,
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cl::ZeroOrMore,
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cl::init('2'));
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static cl::opt<bool> DisableVerify(
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"disable-verify", cl::init(false),
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cl::desc("Do not run the verifier during the optimization pipeline"));
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static cl::opt<bool>
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DisableInline("disable-inlining", cl::init(false),
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cl::desc("Do not run the inliner pass"));
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static cl::opt<bool>
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DisableGVNLoadPRE("disable-gvn-loadpre", cl::init(false),
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cl::desc("Do not run the GVN load PRE pass"));
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static cl::opt<bool>
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DisableLTOVectorization("disable-lto-vectorization", cl::init(false),
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cl::desc("Do not run loop or slp vectorization during LTO"));
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static cl::opt<bool>
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UseDiagnosticHandler("use-diagnostic-handler", cl::init(false),
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cl::desc("Use a diagnostic handler to test the handler interface"));
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static cl::list<std::string>
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InputFilenames(cl::Positional, cl::OneOrMore,
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cl::desc("<input bitcode files>"));
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static cl::opt<std::string>
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OutputFilename("o", cl::init(""),
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cl::desc("Override output filename"),
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cl::value_desc("filename"));
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static cl::list<std::string>
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ExportedSymbols("exported-symbol",
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cl::desc("Symbol to export from the resulting object file"),
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cl::ZeroOrMore);
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static cl::list<std::string>
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DSOSymbols("dso-symbol",
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cl::desc("Symbol to put in the symtab in the resulting dso"),
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cl::ZeroOrMore);
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static cl::opt<bool> ListSymbolsOnly(
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"list-symbols-only", cl::init(false),
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cl::desc("Instead of running LTO, list the symbols in each IR file"));
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static cl::opt<bool> SetMergedModule(
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"set-merged-module", cl::init(false),
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cl::desc("Use the first input module as the merged module"));
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static cl::opt<unsigned> Parallelism("j", cl::Prefix, cl::init(1),
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cl::desc("Number of backend threads"));
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namespace {
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struct ModuleInfo {
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std::vector<bool> CanBeHidden;
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};
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}
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static void handleDiagnostics(lto_codegen_diagnostic_severity_t Severity,
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const char *Msg, void *) {
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switch (Severity) {
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case LTO_DS_NOTE:
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errs() << "note: ";
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break;
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case LTO_DS_REMARK:
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errs() << "remark: ";
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break;
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case LTO_DS_ERROR:
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errs() << "error: ";
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break;
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case LTO_DS_WARNING:
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errs() << "warning: ";
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break;
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}
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errs() << Msg << "\n";
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}
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static std::unique_ptr<LTOModule>
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getLocalLTOModule(StringRef Path, std::unique_ptr<MemoryBuffer> &Buffer,
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const TargetOptions &Options, std::string &Error) {
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ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
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MemoryBuffer::getFile(Path);
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if (std::error_code EC = BufferOrErr.getError()) {
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Error = EC.message();
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return nullptr;
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}
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Buffer = std::move(BufferOrErr.get());
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return std::unique_ptr<LTOModule>(LTOModule::createInLocalContext(
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Buffer->getBufferStart(), Buffer->getBufferSize(), Options, Error, Path));
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}
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/// \brief List symbols in each IR file.
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///
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/// The main point here is to provide lit-testable coverage for the LTOModule
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/// functionality that's exposed by the C API to list symbols. Moreover, this
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/// provides testing coverage for modules that have been created in their own
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/// contexts.
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static int listSymbols(StringRef Command, const TargetOptions &Options) {
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for (auto &Filename : InputFilenames) {
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std::string Error;
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std::unique_ptr<MemoryBuffer> Buffer;
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std::unique_ptr<LTOModule> Module =
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getLocalLTOModule(Filename, Buffer, Options, Error);
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if (!Module) {
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errs() << Command << ": error loading file '" << Filename
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<< "': " << Error << "\n";
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return 1;
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}
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// List the symbols.
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outs() << Filename << ":\n";
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for (int I = 0, E = Module->getSymbolCount(); I != E; ++I)
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outs() << Module->getSymbolName(I) << "\n";
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}
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return 0;
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}
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int main(int argc, char **argv) {
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// Print a stack trace if we signal out.
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sys::PrintStackTraceOnErrorSignal();
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PrettyStackTraceProgram X(argc, argv);
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llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
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cl::ParseCommandLineOptions(argc, argv, "llvm LTO linker\n");
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if (OptLevel < '0' || OptLevel > '3') {
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errs() << argv[0] << ": optimization level must be between 0 and 3\n";
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return 1;
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}
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// Initialize the configured targets.
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InitializeAllTargets();
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InitializeAllTargetMCs();
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InitializeAllAsmPrinters();
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InitializeAllAsmParsers();
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// set up the TargetOptions for the machine
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TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
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if (ListSymbolsOnly)
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return listSymbols(argv[0], Options);
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unsigned BaseArg = 0;
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LTOCodeGenerator CodeGen;
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if (UseDiagnosticHandler)
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CodeGen.setDiagnosticHandler(handleDiagnostics, nullptr);
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CodeGen.setCodePICModel(RelocModel);
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CodeGen.setDebugInfo(LTO_DEBUG_MODEL_DWARF);
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CodeGen.setTargetOptions(Options);
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llvm::StringSet<llvm::MallocAllocator> DSOSymbolsSet;
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for (unsigned i = 0; i < DSOSymbols.size(); ++i)
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DSOSymbolsSet.insert(DSOSymbols[i]);
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std::vector<std::string> KeptDSOSyms;
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for (unsigned i = BaseArg; i < InputFilenames.size(); ++i) {
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std::string error;
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std::unique_ptr<LTOModule> Module(
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LTOModule::createFromFile(InputFilenames[i].c_str(), Options, error));
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if (!error.empty()) {
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errs() << argv[0] << ": error loading file '" << InputFilenames[i]
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<< "': " << error << "\n";
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return 1;
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}
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unsigned NumSyms = Module->getSymbolCount();
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for (unsigned I = 0; I < NumSyms; ++I) {
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StringRef Name = Module->getSymbolName(I);
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if (!DSOSymbolsSet.count(Name))
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continue;
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lto_symbol_attributes Attrs = Module->getSymbolAttributes(I);
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unsigned Scope = Attrs & LTO_SYMBOL_SCOPE_MASK;
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if (Scope != LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN)
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KeptDSOSyms.push_back(Name);
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}
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// We use the first input module as the destination module when
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// SetMergedModule is true.
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if (SetMergedModule && i == BaseArg) {
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// Transfer ownership to the code generator.
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CodeGen.setModule(std::move(Module));
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} else if (!CodeGen.addModule(Module.get())) {
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// Print a message here so that we know addModule() did not abort.
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errs() << argv[0] << ": error adding file '" << InputFilenames[i] << "'\n";
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return 1;
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}
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}
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// Add all the exported symbols to the table of symbols to preserve.
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for (unsigned i = 0; i < ExportedSymbols.size(); ++i)
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CodeGen.addMustPreserveSymbol(ExportedSymbols[i].c_str());
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// Add all the dso symbols to the table of symbols to expose.
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for (unsigned i = 0; i < KeptDSOSyms.size(); ++i)
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CodeGen.addMustPreserveSymbol(KeptDSOSyms[i].c_str());
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// Set cpu and attrs strings for the default target/subtarget.
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CodeGen.setCpu(MCPU.c_str());
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CodeGen.setOptLevel(OptLevel - '0');
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std::string attrs;
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for (unsigned i = 0; i < MAttrs.size(); ++i) {
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if (i > 0)
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attrs.append(",");
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attrs.append(MAttrs[i]);
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}
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if (!attrs.empty())
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CodeGen.setAttr(attrs.c_str());
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if (!OutputFilename.empty()) {
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std::string ErrorInfo;
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if (!CodeGen.optimize(DisableVerify, DisableInline, DisableGVNLoadPRE,
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DisableLTOVectorization, ErrorInfo)) {
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errs() << argv[0] << ": error optimizing the code: " << ErrorInfo << "\n";
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return 1;
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}
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std::list<tool_output_file> OSs;
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std::vector<raw_pwrite_stream *> OSPtrs;
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for (unsigned I = 0; I != Parallelism; ++I) {
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std::string PartFilename = OutputFilename;
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if (Parallelism != 1)
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PartFilename += "." + utostr(I);
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std::error_code EC;
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OSs.emplace_back(PartFilename, EC, sys::fs::F_None);
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if (EC) {
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errs() << argv[0] << ": error opening the file '" << PartFilename
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<< "': " << EC.message() << "\n";
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return 1;
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}
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OSPtrs.push_back(&OSs.back().os());
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}
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if (!CodeGen.compileOptimized(OSPtrs, ErrorInfo)) {
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errs() << argv[0] << ": error compiling the code: " << ErrorInfo << "\n";
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return 1;
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}
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for (tool_output_file &OS : OSs)
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OS.keep();
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} else {
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if (Parallelism != 1) {
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errs() << argv[0] << ": -j must be specified together with -o\n";
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return 1;
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}
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std::string ErrorInfo;
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const char *OutputName = nullptr;
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if (!CodeGen.compile_to_file(&OutputName, DisableVerify, DisableInline,
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DisableGVNLoadPRE, DisableLTOVectorization,
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ErrorInfo)) {
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errs() << argv[0]
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<< ": error compiling the code: " << ErrorInfo
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<< "\n";
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return 1;
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}
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outs() << "Wrote native object file '" << OutputName << "'\n";
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}
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return 0;
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}
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