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308 lines
11 KiB
C++
308 lines
11 KiB
C++
//===- llvm-ld.cpp - LLVM 'ld' compatible linker --------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This utility is intended to be compatible with GCC, and follows standard
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// system 'ld' conventions. As such, the default output file is ./a.out.
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// Additionally, this program outputs a shell script that is used to invoke LLI
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// to execute the program. In this manner, the generated executable (a.out for
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// example), is directly executable, whereas the bytecode file actually lives in
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// the a.out.bc file generated by this program. Also, Force is on by default.
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//
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// Note that if someone (or a script) deletes the executable program generated,
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// the .bc file will be left around. Considering that this is a temporary hack,
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// I'm not too worried about this.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm-ld.h"
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/Bytecode/Reader.h"
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#include "llvm/Bytecode/WriteBytecodePass.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetMachineRegistry.h"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Support/Linker.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/FileUtilities.h"
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#include "llvm/System/Signals.h"
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#include "llvm/Support/SystemUtils.h"
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#include <fstream>
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#include <memory>
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using namespace llvm;
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enum OptimizationLevels {
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OPT_FAST_COMPILE,
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OPT_SIMPLE,
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OPT_AGGRESSIVE,
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OPT_LINK_TIME,
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OPT_AGGRESSIVE_LINK_TIME
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};
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namespace {
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cl::list<std::string>
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InputFilenames(cl::Positional, cl::desc("<input bytecode files>"),
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cl::OneOrMore);
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cl::opt<std::string>
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OutputFilename("o", cl::desc("Override output filename"), cl::init("a.out"),
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cl::value_desc("filename"));
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cl::opt<bool>
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Verbose("v", cl::desc("Print information about actions taken"));
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cl::list<std::string>
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LibPaths("L", cl::desc("Specify a library search path"), cl::Prefix,
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cl::value_desc("directory"));
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cl::list<std::string>
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Libraries("l", cl::desc("Specify libraries to link to"), cl::Prefix,
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cl::value_desc("library prefix"));
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cl::opt<bool>
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Strip("s", cl::desc("Strip symbol info from executable"));
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cl::opt<bool>
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NoInternalize("disable-internalize",
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cl::desc("Do not mark all symbols as internal"));
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cl::alias
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ExportDynamic("export-dynamic", cl::desc("Alias for -disable-internalize"),
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cl::aliasopt(NoInternalize));
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cl::opt<bool>
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LinkAsLibrary("link-as-library", cl::desc("Link the .bc files together as a"
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" library, not an executable"));
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cl::alias
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Relink("r", cl::desc("Alias for -link-as-library"),
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cl::aliasopt(LinkAsLibrary));
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cl::opt<const TargetMachineRegistry::Entry*, false, TargetNameParser>
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MachineArch("march", cl::desc("Architecture to generate assembly for:"));
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cl::opt<bool>
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Native("native",
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cl::desc("Generate a native binary instead of a shell script"));
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cl::opt<bool>
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NativeCBE("native-cbe",
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cl::desc("Generate a native binary with the C backend and GCC"));
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// Compatibility options that are ignored but supported by LD
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cl::opt<std::string>
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CO3("soname", cl::Hidden, cl::desc("Compatibility option: ignored"));
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cl::opt<std::string>
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CO4("version-script", cl::Hidden, cl::desc("Compatibility option: ignored"));
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cl::opt<bool>
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CO5("eh-frame-hdr", cl::Hidden, cl::desc("Compatibility option: ignored"));
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cl::opt<std::string>
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CO6("h", cl::Hidden, cl::desc("Compatibility option: ignored"));
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cl::opt<OptimizationLevels> OptLevel(
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cl::desc("Choose level of optimization to apply:"),
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cl::init(OPT_FAST_COMPILE), cl::values(
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clEnumValN(OPT_FAST_COMPILE,"O0",
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"An alias for the -O1 option."),
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clEnumValN(OPT_FAST_COMPILE,"O1",
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"Optimize for linking speed, not execution speed."),
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clEnumValN(OPT_SIMPLE,"O2",
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"Perform only required/minimal optimizations"),
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clEnumValN(OPT_AGGRESSIVE,"O3",
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"An alias for the -O2 option."),
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clEnumValN(OPT_LINK_TIME,"O4",
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"Perform standard link time optimizations"),
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clEnumValN(OPT_AGGRESSIVE_LINK_TIME,"O5",
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"Perform aggressive link time optimizations"),
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clEnumValEnd
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)
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);
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}
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/// PrintAndReturn - Prints a message to standard error and returns true.
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///
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/// Inputs:
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/// progname - The name of the program (i.e. argv[0]).
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/// Message - The message to print to standard error.
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///
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static int PrintAndReturn(const char *progname, const std::string &Message) {
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std::cerr << progname << ": " << Message << "\n";
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return 1;
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}
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/// EmitShellScript - Output the wrapper file that invokes the JIT on the LLVM
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/// bytecode file for the program.
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static void EmitShellScript(char **argv) {
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#if defined(_WIN32) || defined(__CYGWIN__)
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// Windows doesn't support #!/bin/sh style shell scripts in .exe files. To
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// support windows systems, we copy the llvm-stub.exe executable from the
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// build tree to the destination file.
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std::string llvmstub = FindExecutable("llvm-stub.exe", argv[0]);
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if (llvmstub.empty()) {
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std::cerr << "Could not find llvm-stub.exe executable!\n";
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exit(1);
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}
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if (CopyFile(OutputFilename, llvmstub)) {
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std::cerr << "Could not copy the llvm-stub.exe executable!\n";
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exit(1);
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}
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return;
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#endif
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// Output the script to start the program...
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std::ofstream Out2(OutputFilename.c_str());
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if (!Out2.good())
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exit(PrintAndReturn(argv[0], "error opening '" + OutputFilename +
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"' for writing!"));
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Out2 << "#!/bin/sh\n";
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// Allow user to setenv LLVMINTERP if lli is not in their PATH.
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Out2 << "lli=${LLVMINTERP-lli}\n";
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Out2 << "exec $lli \\\n";
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// gcc accepts -l<lib> and implicitly searches /lib and /usr/lib.
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LibPaths.push_back("/lib");
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LibPaths.push_back("/usr/lib");
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LibPaths.push_back("/usr/X11R6/lib");
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// We don't need to link in libc! In fact, /usr/lib/libc.so may not be a
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// shared object at all! See RH 8: plain text.
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std::vector<std::string>::iterator libc =
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std::find(Libraries.begin(), Libraries.end(), "c");
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if (libc != Libraries.end()) Libraries.erase(libc);
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// List all the shared object (native) libraries this executable will need
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// on the command line, so that we don't have to do this manually!
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for (std::vector<std::string>::iterator i = Libraries.begin(),
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e = Libraries.end(); i != e; ++i) {
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std::string FullLibraryPath = FindLib(*i, LibPaths, true);
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if (!FullLibraryPath.empty() && IsSharedObject(FullLibraryPath))
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Out2 << " -load=" << FullLibraryPath << " \\\n";
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}
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Out2 << " $0.bc ${1+\"$@\"}\n";
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Out2.close();
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}
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int main(int argc, char **argv, char **envp) {
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cl::ParseCommandLineOptions(argc, argv, " llvm linker for GCC\n");
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sys::PrintStackTraceOnErrorSignal();
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std::string ModuleID("llvm-ld-output");
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std::auto_ptr<Module> Composite(new Module(ModuleID));
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// We always look first in the current directory when searching for libraries.
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LibPaths.insert(LibPaths.begin(), ".");
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// If the user specified an extra search path in their environment, respect
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// it.
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if (char *SearchPath = getenv("LLVM_LIB_SEARCH_PATH"))
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LibPaths.push_back(SearchPath);
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// Remove any consecutive duplicates of the same library...
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Libraries.erase(std::unique(Libraries.begin(), Libraries.end()),
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Libraries.end());
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// Link in all of the files
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if (LinkFiles(argv[0], Composite.get(), InputFilenames, Verbose))
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return 1; // Error already printed
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// Link in all of the libraries next...
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if (!LinkAsLibrary)
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LinkLibraries(argv[0], Composite.get(), Libraries, LibPaths,
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Verbose, Native);
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// Create the output file.
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std::string RealBytecodeOutput = OutputFilename;
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if (!LinkAsLibrary) RealBytecodeOutput += ".bc";
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std::ofstream Out(RealBytecodeOutput.c_str());
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if (!Out.good())
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return PrintAndReturn(argv[0], "error opening '" + RealBytecodeOutput +
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"' for writing!");
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// Ensure that the bytecode file gets removed from the disk if we get a
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// terminating signal.
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sys::RemoveFileOnSignal(RealBytecodeOutput);
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// Generate the bytecode file.
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if (GenerateBytecode(Composite.get(), Strip, !NoInternalize, &Out)) {
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Out.close();
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return PrintAndReturn(argv[0], "error generating bytecode");
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}
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// Close the bytecode file.
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Out.close();
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// If we are not linking a library, generate either a native executable
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// or a JIT shell script, depending upon what the user wants.
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if (!LinkAsLibrary) {
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// If the user wants to generate a native executable, compile it from the
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// bytecode file.
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//
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// Otherwise, create a script that will run the bytecode through the JIT.
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if (Native) {
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// Name of the Assembly Language output file
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std::string AssemblyFile = OutputFilename + ".s";
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// Mark the output files for removal if we get an interrupt.
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sys::RemoveFileOnSignal(AssemblyFile);
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sys::RemoveFileOnSignal(OutputFilename);
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// Determine the locations of the llc and gcc programs.
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std::string llc = FindExecutable("llc", argv[0]);
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std::string gcc = FindExecutable("gcc", argv[0]);
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if (llc.empty())
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return PrintAndReturn(argv[0], "Failed to find llc");
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if (gcc.empty())
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return PrintAndReturn(argv[0], "Failed to find gcc");
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// Generate an assembly language file for the bytecode.
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if (Verbose) std::cout << "Generating Assembly Code\n";
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GenerateAssembly(AssemblyFile, RealBytecodeOutput, llc, envp);
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if (Verbose) std::cout << "Generating Native Code\n";
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GenerateNative(OutputFilename, AssemblyFile, Libraries, LibPaths,
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gcc, envp);
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// Remove the assembly language file.
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removeFile (AssemblyFile);
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} else if (NativeCBE) {
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std::string CFile = OutputFilename + ".cbe.c";
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// Mark the output files for removal if we get an interrupt.
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sys::RemoveFileOnSignal(CFile);
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sys::RemoveFileOnSignal(OutputFilename);
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// Determine the locations of the llc and gcc programs.
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std::string llc = FindExecutable("llc", argv[0]);
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std::string gcc = FindExecutable("gcc", argv[0]);
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if (llc.empty())
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return PrintAndReturn(argv[0], "Failed to find llc");
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if (gcc.empty())
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return PrintAndReturn(argv[0], "Failed to find gcc");
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// Generate an assembly language file for the bytecode.
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if (Verbose) std::cout << "Generating Assembly Code\n";
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GenerateCFile(CFile, RealBytecodeOutput, llc, envp);
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if (Verbose) std::cout << "Generating Native Code\n";
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GenerateNative(OutputFilename, CFile, Libraries, LibPaths, gcc, envp);
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// Remove the assembly language file.
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removeFile(CFile);
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} else {
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EmitShellScript(argv);
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}
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// Make the script executable...
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MakeFileExecutable(OutputFilename);
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// Make the bytecode file readable and directly executable in LLEE as well
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MakeFileExecutable(RealBytecodeOutput);
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MakeFileReadable(RealBytecodeOutput);
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}
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return 0;
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}
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