From 009b1c42aa6266385f2c37e227516b24077e6dd7 Mon Sep 17 00:00:00 2001
From: Ed Schouten <ed@FreeBSD.org>
Date: Tue, 2 Jun 2009 17:52:33 +0000
Subject: Import LLVM, at r72732.

---
 tools/llvm-link/llvm-link.cpp | 154 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 154 insertions(+)
 create mode 100644 tools/llvm-link/llvm-link.cpp

(limited to 'tools/llvm-link/llvm-link.cpp')

diff --git a/tools/llvm-link/llvm-link.cpp b/tools/llvm-link/llvm-link.cpp
new file mode 100644
index 0000000000000..15850f4717e38
--- /dev/null
+++ b/tools/llvm-link/llvm-link.cpp
@@ -0,0 +1,154 @@
+//===- 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.h"
+#include "llvm/Module.h"
+#include "llvm/Analysis/Verifier.h"
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/Support/Streams.h"
+#include "llvm/System/Signals.h"
+#include "llvm/System/Path.h"
+#include <fstream>
+#include <iostream>
+#include <memory>
+using namespace llvm;
+
+static cl::list<std::string>
+InputFilenames(cl::Positional, cl::OneOrMore,
+               cl::desc("<input bitcode files>"));
+
+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("Overwrite output files"));
+
+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);
+
+// LoadFile - 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 inline std::auto_ptr<Module> LoadFile(const std::string &FN) {
+  sys::Path Filename;
+  if (!Filename.set(FN)) {
+    cerr << "Invalid file name: '" << FN << "'\n";
+    return std::auto_ptr<Module>();
+  }
+
+  std::string ErrorMessage;
+  if (Filename.exists()) {
+    if (Verbose) cerr << "Loading '" << Filename.c_str() << "'\n";
+    Module* Result = 0;
+    
+    const std::string &FNStr = Filename.toString();
+    if (MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(FNStr,
+                                                            &ErrorMessage)) {
+      Result = ParseBitcodeFile(Buffer, &ErrorMessage);
+      delete Buffer;
+    }
+    if (Result) return std::auto_ptr<Module>(Result);   // Load successful!
+
+    if (Verbose) {
+      cerr << "Error opening bitcode file: '" << Filename.c_str() << "'";
+      if (ErrorMessage.size()) cerr << ": " << ErrorMessage;
+      cerr << "\n";
+    }
+  } else {
+    cerr << "Bitcode file: '" << Filename.c_str() << "' does not exist.\n";
+  }
+
+  return std::auto_ptr<Module>();
+}
+
+int main(int argc, char **argv) {
+  // Print a stack trace if we signal out.
+  sys::PrintStackTraceOnErrorSignal();
+  PrettyStackTraceProgram X(argc, argv);
+  
+  llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
+  cl::ParseCommandLineOptions(argc, argv, "llvm linker\n");
+
+  unsigned BaseArg = 0;
+  std::string ErrorMessage;
+
+  std::auto_ptr<Module> Composite(LoadFile(InputFilenames[BaseArg]));
+  if (Composite.get() == 0) {
+    cerr << argv[0] << ": error loading file '"
+         << InputFilenames[BaseArg] << "'\n";
+    return 1;
+  }
+
+  for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
+    std::auto_ptr<Module> M(LoadFile(InputFilenames[i]));
+    if (M.get() == 0) {
+      cerr << argv[0] << ": error loading file '" <<InputFilenames[i]<< "'\n";
+      return 1;
+    }
+
+    if (Verbose) cerr << "Linking in '" << InputFilenames[i] << "'\n";
+
+    if (Linker::LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
+      cerr << argv[0] << ": link error in '" << InputFilenames[i]
+           << "': " << ErrorMessage << "\n";
+      return 1;
+    }
+  }
+
+  // TODO: Iterate over the -l list and link in any modules containing
+  // global symbols that have not been resolved so far.
+
+  if (DumpAsm) cerr << "Here's the assembly:\n" << *Composite.get();
+
+  // FIXME: cout is not binary!
+  std::ostream *Out = &std::cout;  // Default to printing to stdout...
+  if (OutputFilename != "-") {
+    if (!Force && std::ifstream(OutputFilename.c_str())) {
+      // If force is not specified, make sure not to overwrite a file!
+      cerr << argv[0] << ": error opening '" << OutputFilename
+           << "': file exists!\n"
+           << "Use -f command line argument to force output\n";
+      return 1;
+    }
+    std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
+                                 std::ios::binary;
+    Out = new std::ofstream(OutputFilename.c_str(), io_mode);
+    if (!Out->good()) {
+      cerr << argv[0] << ": error opening '" << OutputFilename << "'!\n";
+      return 1;
+    }
+
+    // Make sure that the Out file gets unlinked from the disk if we get a
+    // SIGINT
+    sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+  }
+
+  if (verifyModule(*Composite.get())) {
+    cerr << argv[0] << ": linked module is broken!\n";
+    return 1;
+  }
+
+  if (Verbose) cerr << "Writing bitcode...\n";
+  WriteBitcodeToFile(Composite.get(), *Out);
+
+  if (Out != &std::cout) delete Out;
+  return 0;
+}
-- 
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