Fix LTO handling of module-level assembly (PR14152).

Patch by Tom Roeder!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191042 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 103 insertions, 0 deletions

diff --git a/tools/llvm-lto/llvm-lto.cpp b/tools/llvm-lto/llvm-lto.cpp
new file mode 100644
index 0000000000..f25037c37a
--- /dev/null
+++ b/tools/llvm-lto/llvm-lto.cpp
@@ -0,0 +1,103 @@
+//===-- llvm-lto: a simple command-line program to link modules with LTO --===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This program takes in a list of bitcode files, links them, performs link-time
+// optimization, and outputs an object file.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm-c/lto.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/Support/Signals.h"
+#include "llvm/Support/raw_ostream.h"
+
+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"));
+
+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 LTO linker\n");
+
+  unsigned BaseArg = 0;
+  std::string ErrorMessage;
+
+  lto_code_gen_t code_gen = lto_codegen_create();
+  if (code_gen == NULL)
+    errs() << argv[0] << ": error creating a code generation module: "
+           << lto_get_error_message() << "\n";
+
+  lto_codegen_set_pic_model(code_gen, LTO_CODEGEN_PIC_MODEL_DYNAMIC);
+  lto_codegen_set_debug_model(code_gen, LTO_DEBUG_MODEL_DWARF);
+
+  for (unsigned i = BaseArg; i < InputFilenames.size(); ++i) {
+    lto_module_t BitcodeModule = lto_module_create(InputFilenames[i].c_str());
+    if (BitcodeModule == NULL) {
+      errs() << argv[0] << ": error loading file '" << InputFilenames[i]
+             << "': " << lto_get_error_message() << "\n";
+      return 1;
+    }
+
+    if (lto_codegen_add_module(code_gen, BitcodeModule)) {
+      errs() << argv[0] << ": error adding file '" << InputFilenames[i]
+             << "': " << lto_get_error_message() << "\n";
+      lto_module_dispose(BitcodeModule);
+      return 1;
+    }
+
+    lto_module_dispose(BitcodeModule);
+  }
+
+  if (!OutputFilename.empty()) {
+    size_t len = 0;
+    const void *Code = lto_codegen_compile(code_gen, &len);
+    if (Code == NULL) {
+      errs() << argv[0]
+             << ": error compiling the code: " << lto_get_error_message()
+             << "\n";
+      return 1;
+    }
+
+    std::string ErrorInfo;
+    raw_fd_ostream FileStream(OutputFilename.c_str(), ErrorInfo);
+    if (!ErrorInfo.empty()) {
+      errs() << argv[0] << ": error opening the file '" << OutputFilename
+             << "': " << ErrorInfo << "\n";
+      return 1;
+    }
+
+    FileStream.write(reinterpret_cast<const char *>(Code), len);
+  } else {
+    const char *OutputName = NULL;
+    if (lto_codegen_compile_to_file(code_gen, &OutputName)) {
+      errs() << argv[0]
+             << ": error compiling the code: " << lto_get_error_message()
+             << "\n";
+      return 1;
+    }
+
+    outs() << "Wrote native object file '" << OutputName << "'\n";
+  }
+
+  lto_codegen_dispose(code_gen);
+
+  return 0;
+}