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, 58 insertions, 0 deletions

diff --git a/include/llvm-c/LinkTimeOptimizer.h b/include/llvm-c/LinkTimeOptimizer.h
new file mode 100644
index 0000000000..6de33ca9c2
--- /dev/null
+++ b/include/llvm-c/LinkTimeOptimizer.h
@@ -0,0 +1,58 @@
+//===-- llvm/LinkTimeOptimizer.h - LTO Public C Interface -------*- C++ -*-===//
+//
+//                     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 header provides a C API to use the LLVM link time optimization
+// library. This is inteded to be used by linkers which are C-only in
+// their implementation for performing LTO.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LTO_CAPI_H__
+#define __LTO_CAPI_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+  /// This provides a dummy type for pointers to the LTO object.
+  typedef void* llvm_lto_t;
+
+  /// This provides a C-visible enumerator to manage status codes.
+  /// This should map exactly onto the C++ enumerator LTOStatus.
+  typedef enum llvm_lto_status {
+    LLVM_LTO_UNKNOWN,
+    LLVM_LTO_OPT_SUCCESS,
+    LLVM_LTO_READ_SUCCESS,
+    LLVM_LTO_READ_FAILURE,
+    LLVM_LTO_WRITE_FAILURE,
+    LLVM_LTO_NO_TARGET,
+    LLVM_LTO_NO_WORK,
+    LLVM_LTO_MODULE_MERGE_FAILURE,
+    LLVM_LTO_ASM_FAILURE,
+
+    //  Added C-specific error codes
+    LLVM_LTO_NULL_OBJECT
+  } llvm_lto_status_t;
+ 
+  /// This provides C interface to initialize link time optimizer. This allows
+  /// linker to use dlopen() interface to dynamically load LinkTimeOptimizer.
+  /// extern "C" helps, because dlopen() interface uses name to find the symbol.
+  extern llvm_lto_t llvm_create_optimizer(void);
+  extern void llvm_destroy_optimizer(llvm_lto_t lto);
+
+  extern llvm_lto_status_t llvm_read_object_file
+    (llvm_lto_t lto, const char* input_filename);
+  extern llvm_lto_status_t llvm_optimize_modules
+    (llvm_lto_t lto, const char* output_filename);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif