LinkTimeOptimizer.h revision 263508 
1//===-- llvm/LinkTimeOptimizer.h - LTO Public C Interface -------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This header provides a C API to use the LLVM link time optimization
11// library. This is intended to be used by linkers which are C-only in
12// their implementation for performing LTO.
13//
14//===----------------------------------------------------------------------===//
15
16#ifndef LLVM_C_LINKTIMEOPTIMIZER_H
17#define LLVM_C_LINKTIMEOPTIMIZER_H
18
19#ifdef __cplusplus
20extern "C" {
21#endif
22
23/**
24 * @defgroup LLVMCLinkTimeOptimizer Link Time Optimization
25 * @ingroup LLVMC
26 *
27 * @{
28 */
29
30  /// This provides a dummy type for pointers to the LTO object.
31  typedef void* llvm_lto_t;
32
33  /// This provides a C-visible enumerator to manage status codes.
34  /// This should map exactly onto the C++ enumerator LTOStatus.
35  typedef enum llvm_lto_status {
36    LLVM_LTO_UNKNOWN,
37    LLVM_LTO_OPT_SUCCESS,
38    LLVM_LTO_READ_SUCCESS,
39    LLVM_LTO_READ_FAILURE,
40    LLVM_LTO_WRITE_FAILURE,
41    LLVM_LTO_NO_TARGET,
42    LLVM_LTO_NO_WORK,
43    LLVM_LTO_MODULE_MERGE_FAILURE,
44    LLVM_LTO_ASM_FAILURE,
45
46    //  Added C-specific error codes
47    LLVM_LTO_NULL_OBJECT
48  } llvm_lto_status_t;
49
50  /// This provides C interface to initialize link time optimizer. This allows
51  /// linker to use dlopen() interface to dynamically load LinkTimeOptimizer.
52  /// extern "C" helps, because dlopen() interface uses name to find the symbol.
53  extern llvm_lto_t llvm_create_optimizer(void);
54  extern void llvm_destroy_optimizer(llvm_lto_t lto);
55
56  extern llvm_lto_status_t llvm_read_object_file
57    (llvm_lto_t lto, const char* input_filename);
58  extern llvm_lto_status_t llvm_optimize_modules
59    (llvm_lto_t lto, const char* output_filename);
60
61/**
62 * @}
63 */
64
65#ifdef __cplusplus
66}
67#endif
68
69#endif
70