| //===- llvm-link.cpp - Low-level LLVM linker ------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This utility may be invoked in the following manner: |
| // llvm-link a.bc b.bc c.bc -o x.bc |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/Linker/Linker.h" |
| #include "llvm/ADT/STLExtras.h" |
| #include "llvm/Bitcode/ReaderWriter.h" |
| #include "llvm/IR/AutoUpgrade.h" |
| #include "llvm/IR/DiagnosticInfo.h" |
| #include "llvm/IR/DiagnosticPrinter.h" |
| #include "llvm/IR/LLVMContext.h" |
| #include "llvm/IR/Module.h" |
| #include "llvm/IR/Verifier.h" |
| #include "llvm/IRReader/IRReader.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Support/FileSystem.h" |
| #include "llvm/Support/ManagedStatic.h" |
| #include "llvm/Support/Path.h" |
| #include "llvm/Support/PrettyStackTrace.h" |
| #include "llvm/Support/Signals.h" |
| #include "llvm/Support/SourceMgr.h" |
| #include "llvm/Support/SystemUtils.h" |
| #include "llvm/Support/ToolOutputFile.h" |
| #include <memory> |
| using namespace llvm; |
| |
| static cl::list<std::string> |
| InputFilenames(cl::Positional, cl::OneOrMore, |
| cl::desc("<input bitcode files>")); |
| |
| static cl::list<std::string> OverridingInputs( |
| "override", cl::ZeroOrMore, cl::value_desc("filename"), |
| cl::desc( |
| "input bitcode file which can override previously defined symbol(s)")); |
| |
| static cl::opt<std::string> |
| OutputFilename("o", cl::desc("Override output filename"), cl::init("-"), |
| cl::value_desc("filename")); |
| |
| static cl::opt<bool> |
| Force("f", cl::desc("Enable binary output on terminals")); |
| |
| static cl::opt<bool> |
| OutputAssembly("S", |
| cl::desc("Write output as LLVM assembly"), cl::Hidden); |
| |
| static cl::opt<bool> |
| Verbose("v", cl::desc("Print information about actions taken")); |
| |
| static cl::opt<bool> |
| DumpAsm("d", cl::desc("Print assembly as linked"), cl::Hidden); |
| |
| static cl::opt<bool> |
| SuppressWarnings("suppress-warnings", cl::desc("Suppress all linking warnings"), |
| cl::init(false)); |
| |
| static cl::opt<bool> PreserveBitcodeUseListOrder( |
| "preserve-bc-uselistorder", |
| cl::desc("Preserve use-list order when writing LLVM bitcode."), |
| cl::init(true), cl::Hidden); |
| |
| static cl::opt<bool> PreserveAssemblyUseListOrder( |
| "preserve-ll-uselistorder", |
| cl::desc("Preserve use-list order when writing LLVM assembly."), |
| cl::init(false), cl::Hidden); |
| |
| // Read the specified bitcode file in and return it. This routine searches the |
| // link path for the specified file to try to find it... |
| // |
| static std::unique_ptr<Module> |
| loadFile(const char *argv0, const std::string &FN, LLVMContext &Context) { |
| SMDiagnostic Err; |
| if (Verbose) errs() << "Loading '" << FN << "'\n"; |
| std::unique_ptr<Module> Result = getLazyIRFileModule(FN, Err, Context); |
| if (!Result) |
| Err.print(argv0, errs()); |
| |
| Result->materializeMetadata(); |
| UpgradeDebugInfo(*Result); |
| |
| return Result; |
| } |
| |
| static void diagnosticHandler(const DiagnosticInfo &DI) { |
| unsigned Severity = DI.getSeverity(); |
| switch (Severity) { |
| case DS_Error: |
| errs() << "ERROR: "; |
| break; |
| case DS_Warning: |
| if (SuppressWarnings) |
| return; |
| errs() << "WARNING: "; |
| break; |
| case DS_Remark: |
| case DS_Note: |
| llvm_unreachable("Only expecting warnings and errors"); |
| } |
| |
| DiagnosticPrinterRawOStream DP(errs()); |
| DI.print(DP); |
| errs() << '\n'; |
| } |
| |
| static bool linkFiles(const char *argv0, LLVMContext &Context, Linker &L, |
| const cl::list<std::string> &Files, |
| bool OverrideDuplicateSymbols) { |
| for (const auto &File : Files) { |
| std::unique_ptr<Module> M = loadFile(argv0, File, Context); |
| if (!M.get()) { |
| errs() << argv0 << ": error loading file '" << File << "'\n"; |
| return false; |
| } |
| |
| if (verifyModule(*M, &errs())) { |
| errs() << argv0 << ": " << File << ": error: input module is broken!\n"; |
| return false; |
| } |
| |
| if (Verbose) |
| errs() << "Linking in '" << File << "'\n"; |
| |
| if (L.linkInModule(M.get(), OverrideDuplicateSymbols)) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| int main(int argc, char **argv) { |
| // Print a stack trace if we signal out. |
| sys::PrintStackTraceOnErrorSignal(); |
| PrettyStackTraceProgram X(argc, argv); |
| |
| LLVMContext &Context = getGlobalContext(); |
| llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. |
| cl::ParseCommandLineOptions(argc, argv, "llvm linker\n"); |
| |
| auto Composite = make_unique<Module>("llvm-link", Context); |
| Linker L(Composite.get(), diagnosticHandler); |
| |
| // First add all the regular input files |
| if (!linkFiles(argv[0], Context, L, InputFilenames, false)) |
| return 1; |
| |
| // Next the -override ones. |
| if (!linkFiles(argv[0], Context, L, OverridingInputs, true)) |
| return 1; |
| |
| if (DumpAsm) errs() << "Here's the assembly:\n" << *Composite; |
| |
| std::error_code EC; |
| tool_output_file Out(OutputFilename, EC, sys::fs::F_None); |
| if (EC) { |
| errs() << EC.message() << '\n'; |
| return 1; |
| } |
| |
| if (verifyModule(*Composite, &errs())) { |
| errs() << argv[0] << ": error: linked module is broken!\n"; |
| return 1; |
| } |
| |
| if (Verbose) errs() << "Writing bitcode...\n"; |
| if (OutputAssembly) { |
| Composite->print(Out.os(), nullptr, PreserveAssemblyUseListOrder); |
| } else if (Force || !CheckBitcodeOutputToConsole(Out.os(), true)) |
| WriteBitcodeToFile(Composite.get(), Out.os(), PreserveBitcodeUseListOrder); |
| |
| // Declare success. |
| Out.keep(); |
| |
| return 0; |
| } |