1 files changed, 290 insertions, 0 deletions
diff --git a/contrib/llvm/tools/llvm-lto/llvm-lto.cpp b/contrib/llvm/tools/llvm-lto/llvm-lto.cpp
new file mode 100644
index 0000000..9678c83
--- /dev/null
+++ b/contrib/llvm/tools/llvm-lto/llvm-lto.cpp
@@ -0,0 +1,290 @@
+//===-- 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/CodeGen/CommandFlags.h"
+#include "llvm/LTO/LTOCodeGenerator.h"
+#include "llvm/LTO/LTOModule.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/raw_ostream.h"
+
+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>
+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::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"));
+
+namespace {
+struct ModuleInfo {
+  std::vector<bool> CanBeHidden;
+};
+}
+
+static void handleDiagnostics(lto_codegen_diagnostic_severity_t Severity,
+                              const char *Msg, void *) {
+  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::unique_ptr<LTOModule>
+getLocalLTOModule(StringRef Path, std::unique_ptr<MemoryBuffer> &Buffer,
+                  const TargetOptions &Options, std::string &Error) {
+  ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
+      MemoryBuffer::getFile(Path);
+  if (std::error_code EC = BufferOrErr.getError()) {
+    Error = EC.message();
+    return nullptr;
+  }
+  Buffer = std::move(BufferOrErr.get());
+  return std::unique_ptr<LTOModule>(LTOModule::createInLocalContext(
+      Buffer->getBufferStart(), Buffer->getBufferSize(), Options, Error, Path));
+}
+
+/// \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 int listSymbols(StringRef Command, const TargetOptions &Options) {
+  for (auto &Filename : InputFilenames) {
+    std::string Error;
+    std::unique_ptr<MemoryBuffer> Buffer;
+    std::unique_ptr<LTOModule> Module =
+        getLocalLTOModule(Filename, Buffer, Options, Error);
+    if (!Module) {
+      errs() << Command << ": error loading file '" << Filename
+             << "': " << Error << "\n";
+      return 1;
+    }
+
+    // List the symbols.
+    outs() << Filename << ":\n";
+    for (int I = 0, E = Module->getSymbolCount(); I != E; ++I)
+      outs() << Module->getSymbolName(I) << "\n";
+  }
+  return 0;
+}
+
+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') {
+    errs() << argv[0] << ": optimization level must be between 0 and 3\n";
+    return 1;
+  }
+
+  // Initialize the configured targets.
+  InitializeAllTargets();
+  InitializeAllTargetMCs();
+  InitializeAllAsmPrinters();
+  InitializeAllAsmParsers();
+
+  // set up the TargetOptions for the machine
+  TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
+
+  if (ListSymbolsOnly)
+    return listSymbols(argv[0], Options);
+
+  unsigned BaseArg = 0;
+
+  LTOCodeGenerator CodeGen;
+
+  if (UseDiagnosticHandler)
+    CodeGen.setDiagnosticHandler(handleDiagnostics, nullptr);
+
+  switch (RelocModel) {
+  case Reloc::Static:
+    CodeGen.setCodePICModel(LTO_CODEGEN_PIC_MODEL_STATIC);
+    break;
+  case Reloc::PIC_:
+    CodeGen.setCodePICModel(LTO_CODEGEN_PIC_MODEL_DYNAMIC);
+    break;
+  case Reloc::DynamicNoPIC:
+    CodeGen.setCodePICModel(LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC);
+    break;
+  default:
+    CodeGen.setCodePICModel(LTO_CODEGEN_PIC_MODEL_DEFAULT);
+  }
+
+  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) {
+    std::string error;
+    std::unique_ptr<LTOModule> Module(
+        LTOModule::createFromFile(InputFilenames[i].c_str(), Options, error));
+    if (!error.empty()) {
+      errs() << argv[0] << ": error loading file '" << InputFilenames[i]
+             << "': " << error << "\n";
+      return 1;
+    }
+
+    LTOModule *LTOMod = Module.get();
+
+    // 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(Module.release());
+    } else if (!CodeGen.addModule(Module.get()))
+      return 1;
+
+    unsigned NumSyms = LTOMod->getSymbolCount();
+    for (unsigned I = 0; I < NumSyms; ++I) {
+      StringRef Name = LTOMod->getSymbolName(I);
+      if (!DSOSymbolsSet.count(Name))
+        continue;
+      lto_symbol_attributes Attrs = LTOMod->getSymbolAttributes(I);
+      unsigned Scope = Attrs & LTO_SYMBOL_SCOPE_MASK;
+      if (Scope != LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN)
+        KeptDSOSyms.push_back(Name);
+    }
+  }
+
+  // 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 (!OutputFilename.empty()) {
+    std::string ErrorInfo;
+    std::unique_ptr<MemoryBuffer> Code = CodeGen.compile(
+        DisableInline, DisableGVNLoadPRE, DisableLTOVectorization, ErrorInfo);
+    if (!Code) {
+      errs() << argv[0]
+             << ": error compiling the code: " << ErrorInfo << "\n";
+      return 1;
+    }
+
+    std::error_code EC;
+    raw_fd_ostream FileStream(OutputFilename, EC, sys::fs::F_None);
+    if (EC) {
+      errs() << argv[0] << ": error opening the file '" << OutputFilename
+             << "': " << EC.message() << "\n";
+      return 1;
+    }
+
+    FileStream.write(Code->getBufferStart(), Code->getBufferSize());
+  } else {
+    std::string ErrorInfo;
+    const char *OutputName = nullptr;
+    if (!CodeGen.compile_to_file(&OutputName, DisableInline,
+                                 DisableGVNLoadPRE, DisableLTOVectorization,
+                                 ErrorInfo)) {
+      errs() << argv[0]
+             << ": error compiling the code: " << ErrorInfo
+             << "\n";
+      return 1;
+    }
+
+    outs() << "Wrote native object file '" << OutputName << "'\n";
+  }
+
+  return 0;
+}