From 88fae0edcce84920ba7c5685c36f6bd6cfb9b86d Mon Sep 17 00:00:00 2001
From: Peter Collingbourne <peter@pcc.me.uk>
Date: Thu, 19 Sep 2013 22:15:52 +0000
Subject: 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
---
 tools/llvm-lto/CMakeLists.txt |   7 +++
 tools/llvm-lto/Makefile       |  22 +++++++++
 tools/llvm-lto/llvm-lto.cpp   | 103 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 132 insertions(+)
 create mode 100644 tools/llvm-lto/CMakeLists.txt
 create mode 100644 tools/llvm-lto/Makefile
 create mode 100644 tools/llvm-lto/llvm-lto.cpp

(limited to 'tools/llvm-lto')

diff --git a/tools/llvm-lto/CMakeLists.txt b/tools/llvm-lto/CMakeLists.txt
new file mode 100644
index 0000000..b253b69
--- /dev/null
+++ b/tools/llvm-lto/CMakeLists.txt
@@ -0,0 +1,7 @@
+add_llvm_tool(llvm-lto
+  llvm-lto.cpp
+  )
+
+target_link_libraries(llvm-lto LTO LLVMSupport)
+
+add_dependencies(llvm-lto lto)
diff --git a/tools/llvm-lto/Makefile b/tools/llvm-lto/Makefile
new file mode 100644
index 0000000..1b1a1f8
--- /dev/null
+++ b/tools/llvm-lto/Makefile
@@ -0,0 +1,22 @@
+##===- tools/llvm-lto/Makefile -----------------------------*- Makefile -*-===##
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+##===----------------------------------------------------------------------===##
+
+LEVEL := ../..
+TOOLNAME := llvm-lto
+LINK_COMPONENTS := support
+
+# This tool has no plugins, optimize startup time.
+TOOL_NO_EXPORTS := 1
+
+NO_INSTALL := 1
+
+include $(LEVEL)/Makefile.common
+
+LDFLAGS += -L$(LibDir)
+LIBS += -lLTO
diff --git a/tools/llvm-lto/llvm-lto.cpp b/tools/llvm-lto/llvm-lto.cpp
new file mode 100644
index 0000000..f25037c
--- /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;
+}
-- 
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