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Initial implementation of llvm-ld: stolen from gccld.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16305 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer
2004-09-13 01:27:53 +00:00
parent 247384c041
commit c0af3f0052
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tools/llvm-ld/llvm-ld.cpp Normal file
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//===- 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 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 "llvm-ld.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/Linker.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;
enum OptimizationLevels {
OPT_FAST_COMPILE,
OPT_SIMPLE,
OPT_AGGRESSIVE,
OPT_LINK_TIME,
OPT_AGGRESSIVE_LINK_TIME
};
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("s", cl::desc("Strip 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::desc("Generate a native binary instead of a shell script"));
cl::opt<bool>
NativeCBE("native-cbe",
cl::desc("Generate a native binary with the C backend and GCC"));
// Compatibility options that are ignored but supported by LD
cl::opt<std::string>
CO3("soname", cl::Hidden, cl::desc("Compatibility option: ignored"));
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<OptimizationLevels> OptLevel(
cl::desc("Choose level of optimization to apply:"),
cl::init(OPT_FAST_COMPILE), cl::values(
clEnumValN(OPT_FAST_COMPILE,"O0",
"An alias for the -O1 option."),
clEnumValN(OPT_FAST_COMPILE,"O1",
"Optimize for linking speed, not execution speed."),
clEnumValN(OPT_SIMPLE,"O2",
"Perform only required/minimal optimizations"),
clEnumValN(OPT_AGGRESSIVE,"O3",
"An alias for the -O2 option."),
clEnumValN(OPT_LINK_TIME,"O4",
"Perform standard link time optimizations"),
clEnumValN(OPT_AGGRESSIVE_LINK_TIME,"O5",
"Perform aggressive link time optimizations"),
clEnumValEnd
)
);
}
/// 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]);
if (llvmstub.empty()) {
std::cerr << "Could not find llvm-stub.exe executable!\n";
exit(1);
}
if (CopyFile(OutputFilename, llvmstub)) {
std::cerr << "Could not copy the llvm-stub.exe executable!\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";
// 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) {
std::string FullLibraryPath = FindLib(*i, LibPaths, true);
if (!FullLibraryPath.empty() && IsSharedObject(FullLibraryPath))
Out2 << " -load=" << FullLibraryPath << " \\\n";
}
Out2 << " $0.bc ${1+\"$@\"}\n";
Out2.close();
}
int main(int argc, char **argv, char **envp) {
cl::ParseCommandLineOptions(argc, argv, " llvm linker for GCC\n");
sys::PrintStackTraceOnErrorSignal();
std::string ModuleID("gccld-output");
std::auto_ptr<Module> Composite(new Module(ModuleID));
// We always look first in the current directory when searching for libraries.
LibPaths.insert(LibPaths.begin(), ".");
// If the user specified an extra search path in their environment, respect
// it.
if (char *SearchPath = getenv("LLVM_LIB_SEARCH_PATH"))
LibPaths.push_back(SearchPath);
// Remove any consecutive duplicates of the same library...
Libraries.erase(std::unique(Libraries.begin(), Libraries.end()),
Libraries.end());
// Link in all of the files
if (LinkFiles(argv[0], Composite.get(), InputFilenames, Verbose))
return 1; // Error already printed
if (!LinkAsLibrary)
LinkLibraries(argv[0], Composite.get(), Libraries, LibPaths,
Verbose, Native);
// Link in all of the libraries next...
// Create the output file.
std::string RealBytecodeOutput = OutputFilename;
if (!LinkAsLibrary) RealBytecodeOutput += ".bc";
std::ofstream Out(RealBytecodeOutput.c_str());
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(RealBytecodeOutput);
// Generate the bytecode file.
if (GenerateBytecode(Composite.get(), Strip, !NoInternalize, &Out)) {
Out.close();
return PrintAndReturn(argv[0], "error generating bytecode");
}
// Close the bytecode file.
Out.close();
// 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 generate a native executable, compile it from the
// bytecode file.
//
// Otherwise, create a script that will run the bytecode through the JIT.
if (Native) {
// Name of the Assembly Language output file
std::string AssemblyFile = OutputFilename + ".s";
// Mark the output files for removal if we get an interrupt.
sys::RemoveFileOnSignal(AssemblyFile);
sys::RemoveFileOnSignal(OutputFilename);
// Determine the locations of the llc and gcc programs.
std::string llc = FindExecutable("llc", argv[0]);
std::string gcc = FindExecutable("gcc", argv[0]);
if (llc.empty())
return PrintAndReturn(argv[0], "Failed to find llc");
if (gcc.empty())
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, RealBytecodeOutput, llc, envp);
if (Verbose) std::cout << "Generating Native Code\n";
GenerateNative(OutputFilename, AssemblyFile, Libraries, LibPaths,
gcc, envp);
// Remove the assembly language file.
removeFile (AssemblyFile);
} else if (NativeCBE) {
std::string CFile = OutputFilename + ".cbe.c";
// Mark the output files for removal if we get an interrupt.
sys::RemoveFileOnSignal(CFile);
sys::RemoveFileOnSignal(OutputFilename);
// Determine the locations of the llc and gcc programs.
std::string llc = FindExecutable("llc", argv[0]);
std::string gcc = FindExecutable("gcc", argv[0]);
if (llc.empty())
return PrintAndReturn(argv[0], "Failed to find llc");
if (gcc.empty())
return PrintAndReturn(argv[0], "Failed to find gcc");
// Generate an assembly language file for the bytecode.
if (Verbose) std::cout << "Generating Assembly Code\n";
GenerateCFile(CFile, RealBytecodeOutput, llc, envp);
if (Verbose) std::cout << "Generating Native Code\n";
GenerateNative(OutputFilename, CFile, Libraries, LibPaths, gcc, envp);
// Remove the assembly language file.
removeFile(CFile);
} else {
EmitShellScript(argv);
}
// Make the script executable...
MakeFileExecutable(OutputFilename);
// Make the bytecode file readable and directly executable in LLEE as well
MakeFileExecutable(RealBytecodeOutput);
MakeFileReadable(RealBytecodeOutput);
}
return 0;
}