It's not necessary to do rounding for alloca operations when the requested

alignment is equal to the stack alignment.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 653 insertions, 0 deletions

diff --git a/tools/llvm-ld/llvm-ld.cpp b/tools/llvm-ld/llvm-ld.cpp
new file mode 100644
index 0000000..46788b1
--- /dev/null
+++ b/tools/llvm-ld/llvm-ld.cpp
@@ -0,0 +1,653 @@
+//===- llvm-ld.cpp - LLVM 'ld' compatible linker --------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This utility is intended to be compatible with GCC, and follows standard
+// system 'ld' conventions.  As such, the default output file is ./a.out.
+// Additionally, this program outputs a shell script that is used to invoke LLI
+// to execute the program.  In this manner, the generated executable (a.out for
+// example), is directly executable, whereas the bitcode file actually lives in
+// the a.out.bc file generated by this program.  Also, Force is on by default.
+//
+// Note that if someone (or a script) deletes the executable program generated,
+// the .bc file will be left around.  Considering that this is a temporary hack,
+// I'm not too worried about this.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/LinkAllVMCore.h"
+#include "llvm/Linker.h"
+#include "llvm/System/Program.h"
+#include "llvm/Module.h"
+#include "llvm/PassManager.h"
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetMachineRegistry.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/FileUtilities.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Streams.h"
+#include "llvm/Support/SystemUtils.h"
+#include "llvm/System/Signals.h"
+#include <fstream>
+#include <memory>
+using namespace llvm;
+
+// Input/Output Options
+static cl::list<std::string> InputFilenames(cl::Positional, cl::OneOrMore,
+  cl::desc("<input bitcode files>"));
+
+static cl::opt<std::string> OutputFilename("o", cl::init("a.out"),
+  cl::desc("Override output filename"),
+  cl::value_desc("filename"));
+
+static cl::opt<bool> Verbose("v",
+  cl::desc("Print information about actions taken"));
+
+static cl::list<std::string> LibPaths("L", cl::Prefix,
+  cl::desc("Specify a library search path"),
+  cl::value_desc("directory"));
+
+static cl::list<std::string> Libraries("l", cl::Prefix,
+  cl::desc("Specify libraries to link to"),
+  cl::value_desc("library prefix"));
+
+// Options to control the linking, optimization, and code gen processes
+static cl::opt<bool> LinkAsLibrary("link-as-library",
+  cl::desc("Link the .bc files together as a library, not an executable"));
+
+static cl::alias Relink("r", cl::aliasopt(LinkAsLibrary),
+  cl::desc("Alias for -link-as-library"));
+
+static cl::opt<const TargetMachineRegistry::Entry*, false, TargetNameParser>
+  MachineArch("march", cl::desc("Architecture to generate assembly for:"));
+
+static cl::opt<bool> Native("native",
+  cl::desc("Generate a native binary instead of a shell script"));
+
+static cl::opt<bool>NativeCBE("native-cbe",
+  cl::desc("Generate a native binary with the C backend and GCC"));
+
+static cl::list<std::string> PostLinkOpts("post-link-opts",
+  cl::value_desc("path"),
+  cl::desc("Run one or more optimization programs after linking"));
+
+static cl::list<std::string> XLinker("Xlinker", cl::value_desc("option"),
+  cl::desc("Pass options to the system linker"));
+
+// Compatibility options that llvm-ld ignores but are supported for 
+// compatibility with LD
+static cl::opt<std::string> CO3("soname", cl::Hidden,
+  cl::desc("Compatibility option: ignored"));
+
+static cl::opt<std::string> CO4("version-script", cl::Hidden,
+  cl::desc("Compatibility option: ignored"));
+
+static cl::opt<bool> CO5("eh-frame-hdr", cl::Hidden,
+  cl::desc("Compatibility option: ignored"));
+
+static  cl::opt<std::string> CO6("h", cl::Hidden,
+  cl::desc("Compatibility option: ignored"));
+
+static cl::opt<bool> CO7("start-group", cl::Hidden, 
+  cl::desc("Compatibility option: ignored"));
+
+static cl::opt<bool> CO8("end-group", cl::Hidden, 
+  cl::desc("Compatibility option: ignored"));
+
+/// This is just for convenience so it doesn't have to be passed around
+/// everywhere.
+static std::string progname;
+
+/// PrintAndExit - Prints a message to standard error and exits with error code
+///
+/// Inputs:
+///  Message  - The message to print to standard error.
+///
+static void PrintAndExit(const std::string &Message, int errcode = 1) {
+  cerr << progname << ": " << Message << "\n";
+  llvm_shutdown();
+  exit(errcode);
+}
+
+static void PrintCommand(const std::vector<const char*> &args) {
+  std::vector<const char*>::const_iterator I = args.begin(), E = args.end(); 
+  for (; I != E; ++I)
+    if (*I)
+      cout << "'" << *I << "'" << " ";
+  cout << "\n" << std::flush;
+}
+
+/// CopyEnv - This function takes an array of environment variables and makes a
+/// copy of it.  This copy can then be manipulated any way the caller likes
+/// without affecting the process's real environment.
+///
+/// Inputs:
+///  envp - An array of C strings containing an environment.
+///
+/// Return value:
+///  NULL - An error occurred.
+///
+///  Otherwise, a pointer to a new array of C strings is returned.  Every string
+///  in the array is a duplicate of the one in the original array (i.e. we do
+///  not copy the char *'s from one array to another).
+///
+static char ** CopyEnv(char ** const envp) {
+  // Count the number of entries in the old list;
+  unsigned entries;   // The number of entries in the old environment list
+  for (entries = 0; envp[entries] != NULL; entries++)
+    /*empty*/;
+
+  // Add one more entry for the NULL pointer that ends the list.
+  ++entries;
+
+  // If there are no entries at all, just return NULL.
+  if (entries == 0)
+    return NULL;
+
+  // Allocate a new environment list.
+  char **newenv = new char* [entries];
+  if ((newenv = new char* [entries]) == NULL)
+    return NULL;
+
+  // Make a copy of the list.  Don't forget the NULL that ends the list.
+  entries = 0;
+  while (envp[entries] != NULL) {
+    newenv[entries] = new char[strlen (envp[entries]) + 1];
+    strcpy (newenv[entries], envp[entries]);
+    ++entries;
+  }
+  newenv[entries] = NULL;
+
+  return newenv;
+}
+
+
+/// RemoveEnv - Remove the specified environment variable from the environment
+/// array.
+///
+/// Inputs:
+///  name - The name of the variable to remove.  It cannot be NULL.
+///  envp - The array of environment variables.  It cannot be NULL.
+///
+/// Notes:
+///  This is mainly done because functions to remove items from the environment
+///  are not available across all platforms.  In particular, Solaris does not
+///  seem to have an unsetenv() function or a setenv() function (or they are
+///  undocumented if they do exist).
+///
+static void RemoveEnv(const char * name, char ** const envp) {
+  for (unsigned index=0; envp[index] != NULL; index++) {
+    // Find the first equals sign in the array and make it an EOS character.
+    char *p = strchr (envp[index], '=');
+    if (p == NULL)
+      continue;
+    else
+      *p = '\0';
+
+    // Compare the two strings.  If they are equal, zap this string.
+    // Otherwise, restore it.
+    if (!strcmp(name, envp[index]))
+      *envp[index] = '\0';
+    else
+      *p = '=';
+  }
+
+  return;
+}
+
+/// GenerateBitcode - generates a bitcode file from the module provided
+void GenerateBitcode(Module* M, const std::string& FileName) {
+
+  if (Verbose)
+    cout << "Generating Bitcode To " << FileName << '\n';
+
+  // Create the output file.
+  std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
+                               std::ios::binary;
+  std::ofstream Out(FileName.c_str(), io_mode);
+  if (!Out.good())
+    PrintAndExit("error opening '" + FileName + "' for writing!");
+
+  // Ensure that the bitcode file gets removed from the disk if we get a
+  // terminating signal.
+  sys::RemoveFileOnSignal(sys::Path(FileName));
+
+  // Write it out
+  WriteBitcodeToFile(M, Out);
+
+  // Close the bitcode file.
+  Out.close();
+}
+
+/// GenerateAssembly - generates a native assembly language source file from the
+/// specified bitcode file.
+///
+/// Inputs:
+///  InputFilename  - The name of the input bitcode file.
+///  OutputFilename - The name of the file to generate.
+///  llc            - The pathname to use for LLC.
+///  envp           - The environment to use when running LLC.
+///
+/// Return non-zero value on error.
+///
+static int GenerateAssembly(const std::string &OutputFilename,
+                            const std::string &InputFilename,
+                            const sys::Path &llc,
+                            std::string &ErrMsg ) {
+  // Run LLC to convert the bitcode file into assembly code.
+  std::vector<const char*> args;
+  args.push_back(llc.c_str());
+  args.push_back("-f");
+  args.push_back("-o");
+  args.push_back(OutputFilename.c_str());
+  args.push_back(InputFilename.c_str());
+  args.push_back(0);
+
+  if (Verbose) {
+    cout << "Generating Assembly With: \n";
+    PrintCommand(args);
+  }
+
+  return sys::Program::ExecuteAndWait(llc, &args[0], 0, 0, 0, 0, &ErrMsg);
+}
+
+/// GenerateCFile - generates a C source file from the specified bitcode file.
+static int GenerateCFile(const std::string &OutputFile,
+                         const std::string &InputFile,
+                         const sys::Path &llc,
+                         std::string& ErrMsg) {
+  // Run LLC to convert the bitcode file into C.
+  std::vector<const char*> args;
+  args.push_back(llc.c_str());
+  args.push_back("-march=c");
+  args.push_back("-f");
+  args.push_back("-o");
+  args.push_back(OutputFile.c_str());
+  args.push_back(InputFile.c_str());
+  args.push_back(0);
+
+  if (Verbose) {
+    cout << "Generating C Source With: \n";
+    PrintCommand(args);
+  }
+
+  return sys::Program::ExecuteAndWait(llc, &args[0], 0, 0, 0, 0, &ErrMsg);
+}
+
+/// GenerateNative - generates a native object file from the
+/// specified bitcode file.
+///
+/// Inputs:
+///  InputFilename   - The name of the input bitcode file.
+///  OutputFilename  - The name of the file to generate.
+///  NativeLinkItems - The native libraries, files, code with which to link
+///  LibPaths        - The list of directories in which to find libraries.
+///  gcc             - The pathname to use for GGC.
+///  envp            - A copy of the process's current environment.
+///
+/// Outputs:
+///  None.
+///
+/// Returns non-zero value on error.
+///
+static int GenerateNative(const std::string &OutputFilename,
+                          const std::string &InputFilename,
+                          const Linker::ItemList &LinkItems,
+                          const sys::Path &gcc, char ** const envp,
+                          std::string& ErrMsg) {
+  // Remove these environment variables from the environment of the
+  // programs that we will execute.  It appears that GCC sets these
+  // environment variables so that the programs it uses can configure
+  // themselves identically.
+  //
+  // However, when we invoke GCC below, we want it to use its normal
+  // configuration.  Hence, we must sanitize its environment.
+  char ** clean_env = CopyEnv(envp);
+  if (clean_env == NULL)
+    return 1;
+  RemoveEnv("LIBRARY_PATH", clean_env);
+  RemoveEnv("COLLECT_GCC_OPTIONS", clean_env);
+  RemoveEnv("GCC_EXEC_PREFIX", clean_env);
+  RemoveEnv("COMPILER_PATH", clean_env);
+  RemoveEnv("COLLECT_GCC", clean_env);
+
+
+  // Run GCC to assemble and link the program into native code.
+  //
+  // Note:
+  //  We can't just assemble and link the file with the system assembler
+  //  and linker because we don't know where to put the _start symbol.
+  //  GCC mysteriously knows how to do it.
+  std::vector<std::string> args;
+  args.push_back(gcc.c_str());
+  args.push_back("-fno-strict-aliasing");
+  args.push_back("-O3");
+  args.push_back("-o");
+  args.push_back(OutputFilename);
+  args.push_back(InputFilename);
+
+  // Add in the library paths
+  for (unsigned index = 0; index < LibPaths.size(); index++) {
+    args.push_back("-L");
+    args.push_back(LibPaths[index]);
+  }
+
+  // Add the requested options
+  for (unsigned index = 0; index < XLinker.size(); index++) {
+    args.push_back(XLinker[index]);
+    args.push_back(Libraries[index]);
+  }
+
+  // Add in the libraries to link.
+  for (unsigned index = 0; index < LinkItems.size(); index++)
+    if (LinkItems[index].first != "crtend") {
+      if (LinkItems[index].second)
+        args.push_back("-l" + LinkItems[index].first);
+      else
+        args.push_back(LinkItems[index].first);
+    }
+
+      
+  // Now that "args" owns all the std::strings for the arguments, call the c_str
+  // method to get the underlying string array.  We do this game so that the
+  // std::string array is guaranteed to outlive the const char* array.
+  std::vector<const char *> Args;
+  for (unsigned i = 0, e = args.size(); i != e; ++i)
+    Args.push_back(args[i].c_str());
+  Args.push_back(0);
+
+  if (Verbose) {
+    cout << "Generating Native Executable With:\n";
+    PrintCommand(Args);
+  }
+
+  // Run the compiler to assembly and link together the program.
+  int R = sys::Program::ExecuteAndWait(
+    gcc, &Args[0], (const char**)clean_env, 0, 0, 0, &ErrMsg);
+  delete [] clean_env;
+  return R;
+}
+
+/// EmitShellScript - Output the wrapper file that invokes the JIT on the LLVM
+/// bitcode file for the program.
+static void EmitShellScript(char **argv) {
+  if (Verbose)
+    cout << "Emitting Shell Script\n";
+#if defined(_WIN32) || defined(__CYGWIN__)
+  // Windows doesn't support #!/bin/sh style shell scripts in .exe files.  To
+  // support windows systems, we copy the llvm-stub.exe executable from the
+  // build tree to the destination file.
+  std::string ErrMsg;  
+  sys::Path llvmstub = FindExecutable("llvm-stub.exe", argv[0]);
+  if (llvmstub.isEmpty())
+    PrintAndExit("Could not find llvm-stub.exe executable!");
+
+  if (0 != sys::CopyFile(sys::Path(OutputFilename), llvmstub, &ErrMsg))
+    PrintAndExit(ErrMsg);
+
+  return;
+#endif
+
+  // Output the script to start the program...
+  std::ofstream Out2(OutputFilename.c_str());
+  if (!Out2.good())
+    PrintAndExit("error opening '" + OutputFilename + "' for writing!");
+
+  Out2 << "#!/bin/sh\n";
+  // Allow user to setenv LLVMINTERP if lli is not in their PATH.
+  Out2 << "lli=${LLVMINTERP-lli}\n";
+  Out2 << "exec $lli \\\n";
+  // gcc accepts -l<lib> and implicitly searches /lib and /usr/lib.
+  LibPaths.push_back("/lib");
+  LibPaths.push_back("/usr/lib");
+  LibPaths.push_back("/usr/X11R6/lib");
+  // We don't need to link in libc! In fact, /usr/lib/libc.so may not be a
+  // shared object at all! See RH 8: plain text.
+  std::vector<std::string>::iterator libc =
+    std::find(Libraries.begin(), Libraries.end(), "c");
+  if (libc != Libraries.end()) Libraries.erase(libc);
+  // List all the shared object (native) libraries this executable will need
+  // on the command line, so that we don't have to do this manually!
+  for (std::vector<std::string>::iterator i = Libraries.begin(),
+         e = Libraries.end(); i != e; ++i) {
+    sys::Path FullLibraryPath = sys::Path::FindLibrary(*i);
+    if (!FullLibraryPath.isEmpty() && FullLibraryPath.isDynamicLibrary())
+      Out2 << "    -load=" << FullLibraryPath.toString() << " \\\n";
+  }
+  Out2 << "    $0.bc ${1+\"$@\"}\n";
+  Out2.close();
+}
+
+// BuildLinkItems -- This function generates a LinkItemList for the LinkItems
+// linker function by combining the Files and Libraries in the order they were
+// declared on the command line.
+static void BuildLinkItems(
+  Linker::ItemList& Items,
+  const cl::list<std::string>& Files,
+  const cl::list<std::string>& Libraries) {
+
+  // Build the list of linkage items for LinkItems.
+
+  cl::list<std::string>::const_iterator fileIt = Files.begin();
+  cl::list<std::string>::const_iterator libIt  = Libraries.begin();
+
+  int libPos = -1, filePos = -1;
+  while ( libIt != Libraries.end() || fileIt != Files.end() ) {
+    if (libIt != Libraries.end())
+      libPos = Libraries.getPosition(libIt - Libraries.begin());
+    else
+      libPos = -1;
+    if (fileIt != Files.end())
+      filePos = Files.getPosition(fileIt - Files.begin());
+    else
+      filePos = -1;
+
+    if (filePos != -1 && (libPos == -1 || filePos < libPos)) {
+      // Add a source file
+      Items.push_back(std::make_pair(*fileIt++, false));
+    } else if (libPos != -1 && (filePos == -1 || libPos < filePos)) {
+      // Add a library
+      Items.push_back(std::make_pair(*libIt++, true));
+    }
+  }
+}
+
+// Rightly this should go in a header file but it just seems such a waste.
+namespace llvm {
+extern void Optimize(Module*);
+}
+
+int main(int argc, char **argv, char **envp) {
+  llvm_shutdown_obj X;  // Call llvm_shutdown() on exit.
+  try {
+    // Initial global variable above for convenience printing of program name.
+    progname = sys::Path(argv[0]).getBasename();
+
+    // Parse the command line options
+    cl::ParseCommandLineOptions(argc, argv, " llvm linker\n");
+    sys::PrintStackTraceOnErrorSignal();
+
+    // Construct a Linker (now that Verbose is set)
+    Linker TheLinker(progname, OutputFilename, Verbose);
+
+    // Keep track of the native link items (versus the bitcode items)
+    Linker::ItemList NativeLinkItems;
+
+    // Add library paths to the linker
+    TheLinker.addPaths(LibPaths);
+    TheLinker.addSystemPaths();
+
+    // Remove any consecutive duplicates of the same library...
+    Libraries.erase(std::unique(Libraries.begin(), Libraries.end()),
+                    Libraries.end());
+
+    if (LinkAsLibrary) {
+      std::vector<sys::Path> Files;
+      for (unsigned i = 0; i < InputFilenames.size(); ++i )
+        Files.push_back(sys::Path(InputFilenames[i]));
+      if (TheLinker.LinkInFiles(Files))
+        return 1; // Error already printed
+
+      // The libraries aren't linked in but are noted as "dependent" in the
+      // module.
+      for (cl::list<std::string>::const_iterator I = Libraries.begin(),
+           E = Libraries.end(); I != E ; ++I) {
+        TheLinker.getModule()->addLibrary(*I);
+      }
+    } else {
+      // Build a list of the items from our command line
+      Linker::ItemList Items;
+      BuildLinkItems(Items, InputFilenames, Libraries);
+
+      // Link all the items together
+      if (TheLinker.LinkInItems(Items, NativeLinkItems) )
+        return 1; // Error already printed
+    }
+
+    std::auto_ptr<Module> Composite(TheLinker.releaseModule());
+
+    // Optimize the module
+    Optimize(Composite.get());
+
+    // Generate the bitcode for the optimized module.
+    std::string RealBitcodeOutput = OutputFilename;
+    if (!LinkAsLibrary) RealBitcodeOutput += ".bc";
+    GenerateBitcode(Composite.get(), RealBitcodeOutput);
+
+    // If we are not linking a library, generate either a native executable
+    // or a JIT shell script, depending upon what the user wants.
+    if (!LinkAsLibrary) {
+      // If the user wants to run a post-link optimization, run it now.
+      if (!PostLinkOpts.empty()) {
+        std::vector<std::string> opts = PostLinkOpts;
+        for (std::vector<std::string>::iterator I = opts.begin(),
+             E = opts.end(); I != E; ++I) {
+          sys::Path prog(*I);
+          if (!prog.canExecute()) {
+            prog = sys::Program::FindProgramByName(*I);
+            if (prog.isEmpty())
+              PrintAndExit(std::string("Optimization program '") + *I +
+                "' is not found or not executable.");
+          }
+          // Get the program arguments
+          sys::Path tmp_output("opt_result");
+          std::string ErrMsg;
+          if (tmp_output.createTemporaryFileOnDisk(true, &ErrMsg))
+            PrintAndExit(ErrMsg);
+
+          const char* args[4];
+          args[0] = I->c_str();
+          args[1] = RealBitcodeOutput.c_str();
+          args[2] = tmp_output.c_str();
+          args[3] = 0;
+          if (0 == sys::Program::ExecuteAndWait(prog, args, 0,0,0,0, &ErrMsg)) {
+            if (tmp_output.isBitcodeFile() || tmp_output.isBitcodeFile()) {
+              sys::Path target(RealBitcodeOutput);
+              target.eraseFromDisk();
+              if (tmp_output.renamePathOnDisk(target, &ErrMsg))
+                PrintAndExit(ErrMsg, 2);
+            } else
+              PrintAndExit("Post-link optimization output is not bitcode");
+          } else {
+            PrintAndExit(ErrMsg);
+          }
+        }
+      }
+
+      // If the user wants to generate a native executable, compile it from the
+      // bitcode file.
+      //
+      // Otherwise, create a script that will run the bitcode through the JIT.
+      if (Native) {
+        // Name of the Assembly Language output file
+        sys::Path AssemblyFile ( OutputFilename);
+        AssemblyFile.appendSuffix("s");
+
+        // Mark the output files for removal if we get an interrupt.
+        sys::RemoveFileOnSignal(AssemblyFile);
+        sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+
+        // Determine the locations of the llc and gcc programs.
+        sys::Path llc = FindExecutable("llc", argv[0]);
+        if (llc.isEmpty())
+          PrintAndExit("Failed to find llc");
+
+        sys::Path gcc = FindExecutable("gcc", argv[0]);
+        if (gcc.isEmpty())
+          PrintAndExit("Failed to find gcc");
+
+        // Generate an assembly language file for the bitcode.
+        std::string ErrMsg;
+        if (0 != GenerateAssembly(AssemblyFile.toString(), RealBitcodeOutput,
+            llc, ErrMsg))
+          PrintAndExit(ErrMsg);
+
+        if (0 != GenerateNative(OutputFilename, AssemblyFile.toString(),
+                                NativeLinkItems, gcc, envp, ErrMsg))
+          PrintAndExit(ErrMsg);
+
+        // Remove the assembly language file.
+        AssemblyFile.eraseFromDisk();
+      } else if (NativeCBE) {
+        sys::Path CFile (OutputFilename);
+        CFile.appendSuffix("cbe.c");
+
+        // Mark the output files for removal if we get an interrupt.
+        sys::RemoveFileOnSignal(CFile);
+        sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+
+        // Determine the locations of the llc and gcc programs.
+        sys::Path llc = FindExecutable("llc", argv[0]);
+        if (llc.isEmpty())
+          PrintAndExit("Failed to find llc");
+
+        sys::Path gcc = FindExecutable("gcc", argv[0]);
+        if (gcc.isEmpty())
+          PrintAndExit("Failed to find gcc");
+
+        // Generate an assembly language file for the bitcode.
+        std::string ErrMsg;
+        if (0 != GenerateCFile(
+            CFile.toString(), RealBitcodeOutput, llc, ErrMsg))
+          PrintAndExit(ErrMsg);
+
+        if (0 != GenerateNative(OutputFilename, CFile.toString(), 
+                                NativeLinkItems, gcc, envp, ErrMsg))
+          PrintAndExit(ErrMsg);
+
+        // Remove the assembly language file.
+        CFile.eraseFromDisk();
+
+      } else {
+        EmitShellScript(argv);
+      }
+
+      // Make the script executable...
+      std::string ErrMsg;
+      if (sys::Path(OutputFilename).makeExecutableOnDisk(&ErrMsg))
+        PrintAndExit(ErrMsg);
+
+      // Make the bitcode file readable and directly executable in LLEE as well
+      if (sys::Path(RealBitcodeOutput).makeExecutableOnDisk(&ErrMsg))
+        PrintAndExit(ErrMsg);
+
+      if (sys::Path(RealBitcodeOutput).makeReadableOnDisk(&ErrMsg))
+        PrintAndExit(ErrMsg);
+    }
+  } catch (const std::string& msg) {
+    PrintAndExit(msg,2);
+  } catch (...) {
+    PrintAndExit("Unexpected unknown exception occurred.", 2);
+  }
+
+  // Graceful exit
+  return 0;
+}