1 //===-LTOBackend.h - LLVM Link Time Optimizer Backend ---------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements the "backend" phase of LTO, i.e. it performs
10 // optimization and code generation on a loaded module. It is generally used
11 // internally by the LTO class but can also be used independently, for example
12 // to implement a standalone ThinLTO backend.
13 //
14 //===----------------------------------------------------------------------===//
15 
16 #ifndef LLVM_LTO_LTOBACKEND_H
17 #define LLVM_LTO_LTOBACKEND_H
18 
19 #include "llvm/ADT/MapVector.h"
20 #include "llvm/IR/DiagnosticInfo.h"
21 #include "llvm/IR/ModuleSummaryIndex.h"
22 #include "llvm/LTO/LTO.h"
23 #include "llvm/Support/MemoryBuffer.h"
24 #include "llvm/Target/TargetOptions.h"
25 #include "llvm/Transforms/IPO/FunctionImport.h"
26 
27 namespace llvm {
28 
29 class BitcodeModule;
30 class Error;
31 class Module;
32 class Target;
33 
34 namespace lto {
35 
36 /// Runs a regular LTO backend. The regular LTO backend can also act as the
37 /// regular LTO phase of ThinLTO, which may need to access the combined index.
38 Error backend(const Config &C, AddStreamFn AddStream,
39               unsigned ParallelCodeGenParallelismLevel,
40               std::unique_ptr<Module> M, ModuleSummaryIndex &CombinedIndex);
41 
42 /// Runs a ThinLTO backend.
43 Error thinBackend(const Config &C, unsigned Task, AddStreamFn AddStream,
44                   Module &M, const ModuleSummaryIndex &CombinedIndex,
45                   const FunctionImporter::ImportMapTy &ImportList,
46                   const GVSummaryMapTy &DefinedGlobals,
47                   MapVector<StringRef, BitcodeModule> &ModuleMap);
48 }
49 }
50 
51 #endif
52