Add C wrappers for the LTO library (PR1081). Patch by Chandler Carruth!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32966 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 66 insertions, 0 deletions

diff --git a/tools/lto/lto-c.cpp b/tools/lto/lto-c.cpp
new file mode 100644
index 0000000000..f89b374e19
--- /dev/null
+++ b/tools/lto/lto-c.cpp
@@ -0,0 +1,66 @@
+//===- lto-c.cpp - LLVM Link Time Optimizer C Wrappers --------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Chandler Carruth and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
+//
+// This file implements a C wrapper API for the Link Time Optimization
+// library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm-c/LinkTimeOptimizer.h"
+#include "llvm/LinkTimeOptimizer.h"
+using namespace llvm;
+
+
+/// Create an instance of the LLVM LTO object for performing the link
+/// time optimizations.
+extern "C"
+llvm_lto_t llvm_create_optimizer() {
+  return new llvm::LTO();
+}
+
+/// Destroy an instance of the LLVM LTO object
+extern "C"
+void llvm_destroy_optimizer(llvm_lto_t lto) {
+  delete (llvm::LTO*)lto;
+}
+
+/// Read an LLVM bytecode file using LTO::readLLVMObjectFile.
+extern "C"
+llvm_lto_status
+llvm_read_object_file(llvm_lto_t lto, const char *input_filename) {
+  llvm::LTO *l = (llvm::LTO*)lto;
+
+  if (input_filename == NULL)
+    return LLVM_LTO_READ_FAILURE;
+
+  std::string InputFilename(input_filename);
+  llvm::LTO::NameToSymbolMap symbols;
+  std::set<std::string> references;
+  return (llvm_lto_status)((int)(l->readLLVMObjectFile(InputFilename, symbols,
+                                                       references)));
+}
+
+
+/// Optimize and output object code using LTO::optimizeModules.
+extern "C"
+llvm_lto_status
+llvm_optimize_modules(llvm_lto_t lto, const char *output_filename) {
+  llvm::LTO *l = (llvm::LTO*)lto;
+
+  std::string OutputFilename(output_filename);
+  std::vector<const char *> exportList;
+  std::string targetTriple;
+
+  return (llvm_lto_status)((int)(
+    l->optimizeModules(OutputFilename, exportList,
+                       targetTriple, false, "")));
+}
+
+
+