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+//===- llvm-ld.cpp - LLVM 'ld' compatible linker --------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file 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.
+//
+// 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/LLVMContext.h"
+#include "llvm/Support/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/Support/CommandLine.h"
+#include "llvm/Support/FileUtilities.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/Support/SystemUtils.h"
+#include "llvm/Support/ToolOutputFile.h"
+#include "llvm/Support/Signals.h"
+#include <memory>
+#include <cstring>
+using namespace llvm;
+
+// Rightly this should go in a header file but it just seems such a waste.
+namespace llvm {
+extern void Optimize(Module*);
+}
+
+// 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<std::string> BitcodeOutputFilename("b", cl::init(""),
+ cl::desc("Override bitcode 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> FrameworkPaths("F", cl::Prefix,
+ cl::desc("Specify a framework 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"));
+
+static cl::list<std::string> Frameworks("framework",
+ cl::desc("Specify frameworks to link to"),
+ cl::value_desc("framework"));
+
+// 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<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"));
+
+static cl::opt<std::string> CO9("m", 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;
+
+/// FileRemover objects to clean up output files in the event of an error.
+static FileRemover OutputRemover;
+static FileRemover BitcodeOutputRemover;
+
+/// 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, Module *M, int errcode = 1) {
+ errs() << progname << ": " << Message << "\n";
+ delete M;
+ 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)
+ errs() << "'" << *I << "'" << " ";
+ errs() << "\n";
+}
+
+/// 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 == NULL)
+ return NULL;
+
+ // Make a copy of the list. Don't forget the NULL that ends the list.
+ entries = 0;
+ while (envp[entries] != NULL) {
+ size_t len = strlen(envp[entries]) + 1;
+ newenv[entries] = new char[len];
+ memcpy(newenv[entries], envp[entries], len);
+ ++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)
+ errs() << "Generating Bitcode To " << FileName << '\n';
+
+ // Create the output file.
+ std::string ErrorInfo;
+ tool_output_file Out(FileName.c_str(), ErrorInfo,
+ raw_fd_ostream::F_Binary);
+ if (!ErrorInfo.empty()) {
+ PrintAndExit(ErrorInfo, M);
+ return;
+ }
+
+ // Write it out
+ WriteBitcodeToFile(M, Out.os());
+ Out.keep();
+}
+
+/// 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());
+ // We will use GCC to assemble the program so set the assembly syntax to AT&T,
+ // regardless of what the target in the bitcode file is.
+ args.push_back("-x86-asm-syntax=att");
+ args.push_back("-o");
+ args.push_back(OutputFilename.c_str());
+ args.push_back(InputFilename.c_str());
+ args.push_back(0);
+
+ if (Verbose) {
+ errs() << "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("-o");
+ args.push_back(OutputFile.c_str());
+ args.push_back(InputFile.c_str());
+ args.push_back(0);
+
+ if (Verbose) {
+ errs() << "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.
+/// FrameworksPaths - The list of directories in which to find frameworks.
+/// Frameworks - The list of frameworks (dynamic 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 and framework paths
+ for (unsigned index = 0; index < LibPaths.size(); index++) {
+ args.push_back("-L" + LibPaths[index]);
+ }
+ for (unsigned index = 0; index < FrameworkPaths.size(); index++) {
+ args.push_back("-F" + FrameworkPaths[index]);
+ }
+
+ // Add the requested options
+ for (unsigned index = 0; index < XLinker.size(); index++)
+ args.push_back(XLinker[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);
+ }
+
+ // Add in frameworks to link.
+ for (unsigned index = 0; index < Frameworks.size(); index++) {
+ args.push_back("-framework");
+ args.push_back(Frameworks[index]);
+ }
+
+ // 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) {
+ errs() << "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_cast<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, Module *M) {
+ if (Verbose)
+ errs() << "Emitting Shell Script\n";
+#if defined(_WIN32)
+ // 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 = PrependMainExecutablePath("llvm-stub", argv[0],
+ (void *)(intptr_t)&Optimize);
+ if (llvmstub.isEmpty())
+ PrintAndExit("Could not find llvm-stub.exe executable!", M);
+
+ if (0 != sys::CopyFile(sys::Path(OutputFilename), llvmstub, &ErrMsg))
+ PrintAndExit(ErrMsg, M);
+
+ return;
+#else
+
+ // Output the script to start the program...
+ std::string ErrorInfo;
+ tool_output_file Out2(OutputFilename.c_str(), ErrorInfo);
+ if (!ErrorInfo.empty())
+ PrintAndExit(ErrorInfo, M);
+
+ Out2.os() << "#!/bin/sh\n";
+ // Allow user to setenv LLVMINTERP if lli is not in their PATH.
+ Out2.os() << "lli=${LLVMINTERP-lli}\n";
+ Out2.os() << "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) {
+ // try explicit -L arguments first:
+ sys::Path FullLibraryPath;
+ for (cl::list<std::string>::const_iterator P = LibPaths.begin(),
+ E = LibPaths.end(); P != E; ++P) {
+ FullLibraryPath = *P;
+ FullLibraryPath.appendComponent("lib" + *i);
+ FullLibraryPath.appendSuffix(sys::Path::GetDLLSuffix());
+ if (!FullLibraryPath.isEmpty()) {
+ if (!FullLibraryPath.isDynamicLibrary()) {
+ // Not a native shared library; mark as invalid
+ FullLibraryPath = sys::Path();
+ } else break;
+ }
+ }
+ if (FullLibraryPath.isEmpty())
+ FullLibraryPath = sys::Path::FindLibrary(*i);
+ if (!FullLibraryPath.isEmpty())
+ Out2.os() << " -load=" << FullLibraryPath.str() << " \\\n";
+ }
+ Out2.os() << " " << BitcodeOutputFilename << " ${1+\"$@\"}\n";
+ Out2.keep();
+#endif
+}
+
+// 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));
+ }
+ }
+}
+
+int main(int argc, char **argv, char **envp) {
+ // Print a stack trace if we signal out.
+ sys::PrintStackTraceOnErrorSignal();
+ PrettyStackTraceProgram X(argc, argv);
+
+ LLVMContext &Context = getGlobalContext();
+ llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
+
+ // Initialize passes
+ PassRegistry &Registry = *PassRegistry::getPassRegistry();
+ initializeCore(Registry);
+ initializeScalarOpts(Registry);
+ initializeIPO(Registry);
+ initializeAnalysis(Registry);
+ initializeIPA(Registry);
+ initializeTransformUtils(Registry);
+ initializeInstCombine(Registry);
+ initializeTarget(Registry);
+
+ // Initial global variable above for convenience printing of program name.
+ progname = sys::path::stem(argv[0]);
+
+ // Parse the command line options
+ cl::ParseCommandLineOptions(argc, argv, "llvm linker\n");
+
+#if defined(_WIN32) || defined(__CYGWIN__)
+ if (!LinkAsLibrary) {
+ // Default to "a.exe" instead of "a.out".
+ if (OutputFilename.getNumOccurrences() == 0)
+ OutputFilename = "a.exe";
+
+ // If there is no suffix add an "exe" one.
+ if (sys::path::extension(OutputFilename).empty())
+ OutputFilename.append(".exe");
+ }
+#endif
+
+ // Generate the bitcode for the optimized module.
+ // If -b wasn't specified, use the name specified
+ // with -o to construct BitcodeOutputFilename.
+ if (BitcodeOutputFilename.empty()) {
+ BitcodeOutputFilename = OutputFilename;
+ if (!LinkAsLibrary) BitcodeOutputFilename += ".bc";
+ }
+
+ // Arrange for the bitcode output file to be deleted on any errors.
+ BitcodeOutputRemover.setFile(BitcodeOutputFilename);
+ sys::RemoveFileOnSignal(sys::Path(BitcodeOutputFilename));
+
+ // Arrange for the output file to be deleted on any errors.
+ if (!LinkAsLibrary) {
+ OutputRemover.setFile(OutputFilename);
+ sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+ }
+
+ // Construct a Linker (now that Verbose is set)
+ Linker TheLinker(progname, OutputFilename, Context, 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 output.
+ GenerateBitcode(Composite.get(), BitcodeOutputFilename);
+
+ // 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.", Composite.get());
+ }
+ // Get the program arguments
+ sys::Path tmp_output("opt_result");
+ std::string ErrMsg;
+ if (tmp_output.createTemporaryFileOnDisk(true, &ErrMsg))
+ PrintAndExit(ErrMsg, Composite.get());
+
+ const char* args[4];
+ args[0] = I->c_str();
+ args[1] = BitcodeOutputFilename.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()) {
+ sys::Path target(BitcodeOutputFilename);
+ target.eraseFromDisk();
+ if (tmp_output.renamePathOnDisk(target, &ErrMsg))
+ PrintAndExit(ErrMsg, Composite.get(), 2);
+ } else
+ PrintAndExit("Post-link optimization output is not bitcode",
+ Composite.get());
+ } else {
+ PrintAndExit(ErrMsg, Composite.get());
+ }
+ }
+ }
+
+ // 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.
+ FileRemover AssemblyFileRemover(AssemblyFile.str());
+ sys::RemoveFileOnSignal(AssemblyFile);
+
+ // Determine the locations of the llc and gcc programs.
+ sys::Path llc = PrependMainExecutablePath("llc", argv[0],
+ (void *)(intptr_t)&Optimize);
+ if (llc.isEmpty())
+ PrintAndExit("Failed to find llc", Composite.get());
+
+ sys::Path gcc = sys::Program::FindProgramByName("gcc");
+ if (gcc.isEmpty())
+ PrintAndExit("Failed to find gcc", Composite.get());
+
+ // Generate an assembly language file for the bitcode.
+ std::string ErrMsg;
+ if (0 != GenerateAssembly(AssemblyFile.str(), BitcodeOutputFilename,
+ llc, ErrMsg))
+ PrintAndExit(ErrMsg, Composite.get());
+
+ if (0 != GenerateNative(OutputFilename, AssemblyFile.str(),
+ NativeLinkItems, gcc, envp, ErrMsg))
+ PrintAndExit(ErrMsg, Composite.get());
+ } else if (NativeCBE) {
+ sys::Path CFile (OutputFilename);
+ CFile.appendSuffix("cbe.c");
+
+ // Mark the output files for removal.
+ FileRemover CFileRemover(CFile.str());
+ sys::RemoveFileOnSignal(CFile);
+
+ // Determine the locations of the llc and gcc programs.
+ sys::Path llc = PrependMainExecutablePath("llc", argv[0],
+ (void *)(intptr_t)&Optimize);
+ if (llc.isEmpty())
+ PrintAndExit("Failed to find llc", Composite.get());
+
+ sys::Path gcc = sys::Program::FindProgramByName("gcc");
+ if (gcc.isEmpty())
+ PrintAndExit("Failed to find gcc", Composite.get());
+
+ // Generate an assembly language file for the bitcode.
+ std::string ErrMsg;
+ if (GenerateCFile(CFile.str(), BitcodeOutputFilename, llc, ErrMsg))
+ PrintAndExit(ErrMsg, Composite.get());
+
+ if (GenerateNative(OutputFilename, CFile.str(),
+ NativeLinkItems, gcc, envp, ErrMsg))
+ PrintAndExit(ErrMsg, Composite.get());
+ } else {
+ EmitShellScript(argv, Composite.get());
+ }
+
+ // Make the script executable...
+ std::string ErrMsg;
+ if (sys::Path(OutputFilename).makeExecutableOnDisk(&ErrMsg))
+ PrintAndExit(ErrMsg, Composite.get());
+
+ // Make the bitcode file readable and directly executable in LLEE as well
+ if (sys::Path(BitcodeOutputFilename).makeExecutableOnDisk(&ErrMsg))
+ PrintAndExit(ErrMsg, Composite.get());
+
+ if (sys::Path(BitcodeOutputFilename).makeReadableOnDisk(&ErrMsg))
+ PrintAndExit(ErrMsg, Composite.get());
+ }
+
+ // Operations which may fail are now complete.
+ BitcodeOutputRemover.releaseFile();
+ if (!LinkAsLibrary)
+ OutputRemover.releaseFile();
+
+ // Graceful exit
+ return 0;
+}
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