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llvm-mirror/tools/gccld/gccld.cpp
2005-11-17 16:08:04 +00:00

378 lines
14 KiB
C++

//===- 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/Bytecode/WriteBytecodePass.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileUtilities.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::opt<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::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) {
std::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 llvmstub = FindExecutable("llvm-stub.exe", argv[0]).toString();
if (llvmstub.empty()) {
std::cerr << "Could not find llvm-stub.exe executable!\n";
exit(1);
}
sys::CopyFile(sys::Path(OutputFilename), sys::Path(llvmstub));
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 ) {
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, 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;
BuildLinkItems(Items, InputFilenames, Libraries);
// Link all the items together
if (TheLinker.LinkInItems(Items))
return 1; // Error already printed
}
// 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) std::cout << "Generating Assembly Code\n";
GenerateAssembly(AssemblyFile.toString(), RealBytecodeOutput, llc,
Verbose);
if (Verbose) std::cout << "Generating Native Code\n";
GenerateNative(OutputFilename, AssemblyFile.toString(),
LibPaths, Libraries, gcc, envp, LinkAsLibrary,
NoInternalize, RPath, SOName, Verbose);
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) std::cout << "Generating C Source Code\n";
GenerateCFile(CFile.toString(), RealBytecodeOutput, llc, Verbose);
if (Verbose) std::cout << "Generating Native Code\n";
GenerateNative(OutputFilename, CFile.toString(),
LibPaths, Libraries, gcc, envp, LinkAsLibrary,
NoInternalize, RPath, SOName, Verbose);
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
sys::Path(RealBytecodeOutput).makeExecutableOnDisk();
sys::Path(RealBytecodeOutput).makeReadableOnDisk();
}
// Make the output, whether native or script, executable as well...
sys::Path(OutputFilename).makeExecutableOnDisk();
} catch (const char*msg) {
std::cerr << argv[0] << ": " << msg << "\n";
exitCode = 1;
} catch (const std::string& msg) {
std::cerr << argv[0] << ": " << msg << "\n";
exitCode = 2;
} catch (...) {
// This really shouldn't happen, but just in case ....
std::cerr << argv[0] << ": An unexpected unknown exception occurred.\n";
exitCode = 3;
}
return exitCode;
}