mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-01-06 04:31:08 +00:00
dc0de4f07b
Added code ignore bytecode link failures when generating native code. Moved native code and bytecode generation out of the main() function. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8595 91177308-0d34-0410-b5e6-96231b3b80d8
433 lines
15 KiB
C++
433 lines
15 KiB
C++
//===- gccld.cpp - LLVM 'ld' compatible linker ----------------------------===//
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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/Transforms/Utils/Linker.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/Transforms/IPO.h"
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#include "llvm/Transforms/Scalar.h"
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#include "Support/FileUtilities.h"
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#include "Support/SystemUtils.h"
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#include "Support/CommandLine.h"
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#include "Support/Signals.h"
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#include "Config/unistd.h"
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#include "util.h"
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#include <fstream>
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#include <memory>
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#include <set>
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#include <algorithm>
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//
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// External function prototypes
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//
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extern int
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GenerateBytecode (Module * M,
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bool Strip,
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bool Internalize,
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std::ofstream * Out);
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extern int
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generate_assembly (std::string OutputFilename,
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std::string InputFilename,
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std::string llc,
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char ** const envp);
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extern int
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generate_native (std::string OutputFilename,
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std::string InputFilename,
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std::vector<std::string> Libraries,
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std::string gcc,
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char ** const envp);
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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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static 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::opt<bool>
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Native("native", cl::desc("Generate a native binary instead of a shell script"));
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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<bool>
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CO6("r", cl::Hidden, cl::desc("Compatibility option: ignored"));
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}
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// FileExists - Return true if the specified string is an openable file...
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static inline bool FileExists(const std::string &FN) {
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return access(FN.c_str(), F_OK) != -1;
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}
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// LoadObject - Read the specified "object file", which should not search the
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// library path to find it.
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static inline std::auto_ptr<Module> LoadObject(std::string FN,
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std::string &OutErrorMessage) {
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if (Verbose) std::cerr << "Loading '" << FN << "'\n";
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if (!FileExists(FN)) {
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// Attempt to load from the LLVM_LIB_SEARCH_PATH directory... if we would
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// otherwise fail. This is used to locate objects like crtend.o.
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//
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char *SearchPath = getenv("LLVM_LIB_SEARCH_PATH");
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if (SearchPath && FileExists(std::string(SearchPath)+"/"+FN))
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FN = std::string(SearchPath)+"/"+FN;
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else {
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OutErrorMessage = "could not find input file '" + FN + "'!";
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return std::auto_ptr<Module>();
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}
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}
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std::string ErrorMessage;
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Module *Result = ParseBytecodeFile(FN, &ErrorMessage);
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if (Result) return std::auto_ptr<Module>(Result);
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OutErrorMessage = "Bytecode file '" + FN + "' corrupt!";
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if (ErrorMessage.size()) OutErrorMessage += ": " + ErrorMessage;
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return std::auto_ptr<Module>();
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}
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static Module *LoadSingleLibraryObject(const std::string &Filename) {
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std::string ErrorMessage;
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std::auto_ptr<Module> M = LoadObject(Filename, ErrorMessage);
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if (M.get() == 0 && Verbose) {
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std::cerr << "Error loading '" + Filename + "'";
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if (!ErrorMessage.empty()) std::cerr << ": " << ErrorMessage;
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std::cerr << "\n";
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}
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return M.release();
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}
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// LoadLibraryExactName - This looks for a file with a known name and tries to
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// load it, similarly to LoadLibraryFromDirectory().
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static inline bool LoadLibraryExactName(const std::string &FileName,
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std::vector<Module*> &Objects, bool &isArchive) {
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if (Verbose) std::cerr << " Considering '" << FileName << "'\n";
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if (FileExists(FileName)) {
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if (IsArchive(FileName)) {
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std::string ErrorMessage;
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if (Verbose) std::cerr << " Loading '" << FileName << "'\n";
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if (!ReadArchiveFile(FileName, Objects, &ErrorMessage)) {
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isArchive = true;
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return false; // Success!
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}
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if (Verbose) {
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std::cerr << " Error loading archive '" + FileName + "'";
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if (!ErrorMessage.empty()) std::cerr << ": " << ErrorMessage;
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std::cerr << "\n";
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}
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} else {
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if (Module *M = LoadSingleLibraryObject(FileName)) {
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isArchive = false;
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Objects.push_back(M);
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return false;
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}
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}
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}
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return true;
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}
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// LoadLibrary - Try to load a library named LIBNAME that contains
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// LLVM bytecode. If SEARCH is true, then search for a file named
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// libLIBNAME.{a,so,bc} in the current library search path. Otherwise,
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// assume LIBNAME is the real name of the library file. This method puts
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// the loaded modules into the Objects list, and sets isArchive to true if
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// a .a file was loaded. It returns true if no library is found or if an
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// error occurs; otherwise it returns false.
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//
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static inline bool LoadLibrary(const std::string &LibName,
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std::vector<Module*> &Objects, bool &isArchive,
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bool search, std::string &ErrorMessage) {
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if (search) {
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// First, try the current directory. Then, iterate over the
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// directories in LibPaths, looking for a suitable match for LibName
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// in each one.
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for (unsigned NextLibPathIdx = 0; NextLibPathIdx != LibPaths.size();
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++NextLibPathIdx) {
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std::string Directory = LibPaths[NextLibPathIdx] + "/";
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if (!LoadLibraryExactName(Directory + "lib" + LibName + ".a",
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Objects, isArchive))
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return false;
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if (!LoadLibraryExactName(Directory + "lib" + LibName + ".so",
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Objects, isArchive))
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return false;
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if (!LoadLibraryExactName(Directory + "lib" + LibName + ".bc",
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Objects, isArchive))
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return false;
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}
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} else {
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// If they said no searching, then assume LibName is the real name.
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if (!LoadLibraryExactName(LibName, Objects, isArchive))
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return false;
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}
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ErrorMessage = "error linking library '-l" + LibName+ "': library not found!";
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return true;
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}
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static bool LinkLibrary(Module *M, const std::string &LibName,
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bool search, std::string &ErrorMessage) {
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std::set<std::string> UndefinedSymbols;
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GetAllUndefinedSymbols(M, UndefinedSymbols);
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if (UndefinedSymbols.empty()) {
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if (Verbose) std::cerr << " No symbols undefined, don't link library!\n";
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return false; // No need to link anything in!
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}
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std::vector<Module*> Objects;
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bool isArchive;
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if (LoadLibrary(LibName, Objects, isArchive, search, ErrorMessage))
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return true;
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// Figure out which symbols are defined by all of the modules in the .a file
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std::vector<std::set<std::string> > DefinedSymbols;
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DefinedSymbols.resize(Objects.size());
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for (unsigned i = 0; i != Objects.size(); ++i)
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GetAllDefinedSymbols(Objects[i], DefinedSymbols[i]);
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bool Linked = true;
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while (Linked) { // While we are linking in object files, loop.
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Linked = false;
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for (unsigned i = 0; i != Objects.size(); ++i) {
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// Consider whether we need to link in this module... we only need to
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// link it in if it defines some symbol which is so far undefined.
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//
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const std::set<std::string> &DefSymbols = DefinedSymbols[i];
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bool ObjectRequired = false;
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for (std::set<std::string>::iterator I = UndefinedSymbols.begin(),
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E = UndefinedSymbols.end(); I != E; ++I)
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if (DefSymbols.count(*I)) {
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if (Verbose)
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std::cerr << " Found object providing symbol '" << *I << "'...\n";
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ObjectRequired = true;
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break;
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}
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// We DO need to link this object into the program...
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if (ObjectRequired) {
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if (LinkModules(M, Objects[i], &ErrorMessage))
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return true; // Couldn't link in the right object file...
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// Since we have linked in this object, delete it from the list of
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// objects to consider in this archive file.
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std::swap(Objects[i], Objects.back());
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std::swap(DefinedSymbols[i], DefinedSymbols.back());
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Objects.pop_back();
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DefinedSymbols.pop_back();
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--i; // Do not skip an entry
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// The undefined symbols set should have shrunk.
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GetAllUndefinedSymbols(M, UndefinedSymbols);
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Linked = true; // We have linked something in!
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}
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}
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}
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return false;
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}
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int
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main(int argc, char **argv, char ** envp)
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{
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cl::ParseCommandLineOptions(argc, argv, " llvm linker for GCC\n");
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std::string ErrorMessage;
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std::auto_ptr<Module> Composite(LoadObject(InputFilenames[0], ErrorMessage));
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if (Composite.get() == 0)
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return PrintAndReturn(argv[0], ErrorMessage);
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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 specied an extra search path in their environment, respect 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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for (unsigned i = 1; i < InputFilenames.size(); ++i) {
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// A user may specify an ar archive without -l, perhaps because it
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// is not installed as a library. Detect that and link the library.
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if (IsArchive(InputFilenames[i])) {
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if (Verbose) std::cerr << "Linking archive '" << InputFilenames[i]
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<< "'\n";
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if (LinkLibrary(Composite.get(), InputFilenames[i], false, ErrorMessage))
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return PrintAndReturn(argv[0], ErrorMessage,
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": error linking in '" + InputFilenames[i] + "'");
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continue;
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}
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std::auto_ptr<Module> M(LoadObject(InputFilenames[i], ErrorMessage));
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if (M.get() == 0)
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return PrintAndReturn(argv[0], ErrorMessage);
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if (Verbose) std::cerr << "Linking in '" << InputFilenames[i] << "'\n";
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if (LinkModules(Composite.get(), M.get(), &ErrorMessage))
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return PrintAndReturn(argv[0], ErrorMessage,
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": error linking in '" + InputFilenames[i] + "'");
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}
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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 libraries next...
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for (unsigned i = 0; i != Libraries.size(); ++i) {
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if (Verbose) std::cerr << "Linking in library: -l" << Libraries[i] << "\n";
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if (LinkLibrary(Composite.get(), Libraries[i], true, ErrorMessage))
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if (!Native)
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return PrintAndReturn(argv[0], ErrorMessage);
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}
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//
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// Create the output file.
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//
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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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//
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// Ensure that the bytecode file gets removed from the disk if we get a
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// SIGINT signal.
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//
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RemoveFileOnSignal(RealBytecodeOutput);
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//
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// Generate the bytecode file.
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//
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if (GenerateBytecode (Composite.get(), Strip, !NoInternalize, &Out))
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{
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Out.close();
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return PrintAndReturn(argv[0], "error generating bytcode");
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}
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//
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// Close the bytecode file.
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//
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Out.close();
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//
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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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//
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if (!LinkAsLibrary) {
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//
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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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//
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if (Native)
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{
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// Name of the Assembly Language output file
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std::string AssemblyFile = OutputFilename + ".s";
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//
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// Mark the output files for removal if we get an interrupt.
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//
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RemoveFileOnSignal (AssemblyFile);
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RemoveFileOnSignal (OutputFilename);
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//
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// Determine the locations of the llc and gcc programs.
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//
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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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{
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return PrintAndReturn (argv[0], "Failed to find llc");
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}
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if (gcc.empty())
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{
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return PrintAndReturn (argv[0], "Failed to find gcc");
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}
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//
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// Generate an assembly language file for the bytecode.
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//
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generate_assembly (AssemblyFile, RealBytecodeOutput, llc, envp);
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generate_native (OutputFilename, AssemblyFile, Libraries, gcc, envp);
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//
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// Remove the assembly language file.
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//
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removeFile (AssemblyFile);
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}
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else
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{
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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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return PrintAndReturn(argv[0], "error opening '" + OutputFilename +
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"' for writing!");
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Out2 << "#!/bin/sh\nlli -q $0.bc $*\n";
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Out2.close();
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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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