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-rw-r--r--tools/gccld/gccld.cpp427
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diff --git a/tools/gccld/gccld.cpp b/tools/gccld/gccld.cpp
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-//===- gccld.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 bytecode 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 "gccld.h"
-#include "llvm/Linker.h"
-#include "llvm/Module.h"
-#include "llvm/PassManager.h"
-#include "llvm/Bytecode/Reader.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/Transforms/IPO.h"
-#include "llvm/Transforms/Scalar.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/ManagedStatic.h"
-#include "llvm/Support/FileUtilities.h"
-#include "llvm/Support/ManagedStatic.h"
-#include "llvm/Support/Streams.h"
-#include "llvm/System/Signals.h"
-#include "llvm/Support/SystemUtils.h"
-#include <fstream>
-#include <memory>
-using namespace llvm;
-
-namespace {
- cl::list<std::string>
- InputFilenames(cl::Positional, cl::desc("<input bytecode files>"),
- cl::OneOrMore);
-
- cl::opt<std::string>
- OutputFilename("o", cl::desc("Override output filename"), cl::init("a.out"),
- cl::value_desc("filename"));
-
- cl::opt<bool>
- Verbose("v", cl::desc("Print information about actions taken"));
-
- cl::list<std::string>
- LibPaths("L", cl::desc("Specify a library search path"), cl::Prefix,
- cl::value_desc("directory"));
-
- cl::list<std::string>
- Libraries("l", cl::desc("Specify libraries to link to"), cl::Prefix,
- cl::value_desc("library prefix"));
-
- cl::opt<bool>
- Strip("strip-all", cl::desc("Strip all symbol info from executable"));
- cl::opt<bool>
- StripDebug("strip-debug",
- cl::desc("Strip debugger symbol info from executable"));
-
- cl::opt<bool>
- NoInternalize("disable-internalize",
- cl::desc("Do not mark all symbols as internal"));
- cl::alias
- ExportDynamic("export-dynamic", cl::desc("Alias for -disable-internalize"),
- cl::aliasopt(NoInternalize));
-
- cl::opt<bool>
- LinkAsLibrary("link-as-library", cl::desc("Link the .bc files together as a"
- " library, not an executable"));
- cl::alias
- Relink("r", cl::desc("Alias for -link-as-library"),
- cl::aliasopt(LinkAsLibrary));
-
- cl::opt<bool>
- Native("native", cl::ZeroOrMore,
- cl::desc("Generate a native binary instead of a shell script"));
- cl::opt<bool>
- NativeCBE("native-cbe", cl::ZeroOrMore,
- cl::desc("Generate a native binary with the C backend and GCC"));
-
- cl::opt<bool>
- SaveTemps("save-temps",
- cl::desc("Do not delete temporary files"));
-
- cl::list<std::string>
- RPath("rpath",
- cl::desc("Set runtime shared library search path (requires -native or"
- " -native-cbe)"),
- cl::Prefix, cl::value_desc("directory"));
-
- cl::opt<std::string>
- SOName("soname",
- cl::desc("Set internal name of shared library (requires -native or"
- " -native-cbe)"),
- cl::Prefix, cl::value_desc("name"));
-
- // Compatibility options that are ignored but supported by LD
- cl::opt<std::string>
- CO4("version-script", cl::Hidden, cl::desc("Compatibility option: ignored"));
- cl::opt<bool>
- CO5("eh-frame-hdr", cl::Hidden, cl::desc("Compatibility option: ignored"));
- cl::opt<std::string>
- CO6("h", cl::Hidden, cl::desc("Compatibility option: ignored"));
- cl::opt<bool>
- CO7("start-group", cl::Hidden, cl::desc("Compatibility option: ignored"));
- cl::opt<bool>
- CO8("end-group", cl::Hidden, cl::desc("Compatibility option: ignored"));
-
- cl::alias A0("s", cl::desc("Alias for --strip-all"),
- cl::aliasopt(Strip));
- cl::alias A1("S", cl::desc("Alias for --strip-debug"),
- cl::aliasopt(StripDebug));
-
-}
-
-/// PrintAndReturn - Prints a message to standard error and returns true.
-///
-/// Inputs:
-/// progname - The name of the program (i.e. argv[0]).
-/// Message - The message to print to standard error.
-///
-static int PrintAndReturn(const char *progname, const std::string &Message) {
- cerr << progname << ": " << Message << "\n";
- return 1;
-}
-
-/// EmitShellScript - Output the wrapper file that invokes the JIT on the LLVM
-/// bytecode file for the program.
-static void EmitShellScript(char **argv) {
-#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()) {
- cerr << "Could not find llvm-stub.exe executable!\n";
- exit(1);
- }
- if (0 != sys::CopyFile(sys::Path(OutputFilename), llvmstub, &ErrMsg)) {
- cerr << argv[0] << ": " << ErrMsg << "\n";
- exit(1);
- }
-
- return;
-#endif
-
- // Output the script to start the program...
- std::ofstream Out2(OutputFilename.c_str());
- if (!Out2.good())
- exit(PrintAndReturn(argv[0], "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";
-
- // 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));
- }
- }
-}
-
-int main(int argc, char **argv, char **envp ) {
- llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
- cl::ParseCommandLineOptions(argc, argv, " llvm linker for GCC\n");
- sys::PrintStackTraceOnErrorSignal();
-
- int exitCode = 0;
-
- std::string ProgName = sys::Path(argv[0]).getBasename();
- Linker TheLinker(ProgName, OutputFilename, Verbose);
-
- try {
- // Remove any consecutive duplicates of the same library...
- Libraries.erase(std::unique(Libraries.begin(), Libraries.end()),
- Libraries.end());
-
- TheLinker.addPaths(LibPaths);
- TheLinker.addSystemPaths();
-
- 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 by linker
-
- // 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;
- Linker::ItemList NativeItems;
- BuildLinkItems(Items, InputFilenames, Libraries);
-
- // Link all the items together
- if (TheLinker.LinkInItems(Items,NativeItems))
- return 1; // Error already printed
-
- // Revise the Libraries based on the remaining (native) libraries that
- // were not linked in to the bytecode. This ensures that we don't attempt
- // to pass a bytecode library to the native linker
- Libraries.clear(); // we've consumed the libraries except for native
- if ((Native || NativeCBE) && !NativeItems.empty()) {
- for (Linker::ItemList::const_iterator I = NativeItems.begin(),
- E = NativeItems.end(); I != E; ++I) {
- Libraries.push_back(I->first);
- }
- }
- }
-
- // We're done with the Linker, so tell it to release its module
- std::auto_ptr<Module> Composite(TheLinker.releaseModule());
-
- // Create the output file.
- std::string RealBytecodeOutput = OutputFilename;
- if (!LinkAsLibrary || Native || NativeCBE) RealBytecodeOutput += ".bc";
- std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
- std::ios::binary;
- std::ofstream Out(RealBytecodeOutput.c_str(), io_mode);
- if (!Out.good())
- return PrintAndReturn(argv[0], "error opening '" + RealBytecodeOutput +
- "' for writing!");
-
- // Ensure that the bytecode file gets removed from the disk if we get a
- // SIGINT signal.
- sys::RemoveFileOnSignal(sys::Path(RealBytecodeOutput));
-
- // Strip everything if Strip is set, otherwise if stripdebug is set, just
- // strip debug info.
- int StripLevel = Strip ? 2 : (StripDebug ? 1 : 0);
-
- // Internalize the module if neither -disable-internalize nor
- // -link-as-library are passed in.
- bool ShouldInternalize = !NoInternalize & !LinkAsLibrary;
-
- // Generate the bytecode file.
- if (GenerateBytecode(Composite.get(), StripLevel, ShouldInternalize, &Out)){
- Out.close();
- return PrintAndReturn(argv[0], "error generating bytecode");
- }
-
- // Close the bytecode file.
- Out.close();
-
- // Generate either a native file or a JIT shell script. If the user wants
- // to generate a native file, compile it from the bytecode file. Otherwise,
- // if the target is not a library, create a script that will run the
- // bytecode 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())
- return PrintAndReturn(argv[0], "Failed to find llc");
-
- sys::Path gcc = FindExecutable("gcc", argv[0]);
- if (gcc.isEmpty())
- return PrintAndReturn(argv[0], "Failed to find gcc");
-
- // Generate an assembly language file for the bytecode.
- if (Verbose) cout << "Generating Assembly Code\n";
- std::string ErrMsg;
- if (0 != GenerateAssembly(
- AssemblyFile.toString(), RealBytecodeOutput, llc, ErrMsg, Verbose)) {
- cerr << argv[0] << ": " << ErrMsg << "\n";
- return 2;
- }
- if (Verbose) cout << "Generating Native Code\n";
- if (0 != GenerateNative(OutputFilename, AssemblyFile.toString(),
- LibPaths, Libraries, gcc, envp, LinkAsLibrary,
- NoInternalize, RPath, SOName, ErrMsg, Verbose) ) {
- cerr << argv[0] << ": " << ErrMsg << "\n";
- return 2;
- }
-
- if (!SaveTemps) {
- // Remove the assembly language file.
- AssemblyFile.eraseFromDisk();
- // Remove the bytecode language file.
- sys::Path(RealBytecodeOutput).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())
- return PrintAndReturn(argv[0], "Failed to find llc");
-
- sys::Path gcc = FindExecutable("gcc", argv[0]);
- if (gcc.isEmpty())
- return PrintAndReturn(argv[0], "Failed to find gcc");
-
- // Generate an assembly language file for the bytecode.
- if (Verbose) cout << "Generating C Source Code\n";
- std::string ErrMsg;
- if (0 != GenerateCFile(
- CFile.toString(), RealBytecodeOutput, llc, ErrMsg, Verbose)) {
- cerr << argv[0] << ": " << ErrMsg << "\n";
- return 2;
- }
- if (Verbose) cout << "Generating Native Code\n";
- if (0 != GenerateNative(OutputFilename, CFile.toString(),
- LibPaths, Libraries, gcc, envp, LinkAsLibrary,
- NoInternalize, RPath, SOName, ErrMsg, Verbose)) {
- cerr << argv[0] << ": " << ErrMsg << "\n";
- return 2;
- }
-
- if (!SaveTemps) {
- // Remove the assembly language file.
- CFile.eraseFromDisk();
- // Remove the bytecode language file.
- sys::Path(RealBytecodeOutput).eraseFromDisk();
- }
-
- } else if (!LinkAsLibrary) {
- EmitShellScript(argv);
-
- // Make the bytecode file readable and directly executable in LLEE
- std::string ErrMsg;
- if (sys::Path(RealBytecodeOutput).makeExecutableOnDisk(&ErrMsg)) {
- cerr << argv[0] << ": " << ErrMsg << "\n";
- return 1;
- }
- if (sys::Path(RealBytecodeOutput).makeReadableOnDisk(&ErrMsg)) {
- cerr << argv[0] << ": " << ErrMsg << "\n";
- return 1;
- }
- }
-
- // Make the output, whether native or script, executable as well...
- std::string ErrMsg;
- if (sys::Path(OutputFilename).makeExecutableOnDisk(&ErrMsg)) {
- cerr << argv[0] << ": " << ErrMsg << "\n";
- return 1;
- }
- } catch (const char*msg) {
- cerr << argv[0] << ": " << msg << "\n";
- exitCode = 1;
- } catch (const std::string& msg) {
- cerr << argv[0] << ": " << msg << "\n";
- exitCode = 2;
- } catch (...) {
- // This really shouldn't happen, but just in case ....
- cerr << argv[0] << ": An unexpected unknown exception occurred.\n";
- exitCode = 3;
- }
-
- llvm_shutdown();
- return exitCode;
-}
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