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