1 //===- ThinLTOBitcodeWriter.h - Bitcode writing pass for ThinLTO ----------===//
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 pass prepares a module containing type metadata for ThinLTO by splitting
10 // it into regular and thin LTO parts if possible, and writing both parts to
11 // a multi-module bitcode file. Modules that do not contain type metadata are
12 // written unmodified as a single module.
13 //
14 //===----------------------------------------------------------------------===//
15 
16 #ifndef LLVM_TRANSFORMS_IPO_THINLTOBITCODEWRITER_H
17 #define LLVM_TRANSFORMS_IPO_THINLTOBITCODEWRITER_H
18 
19 #include <llvm/IR/PassManager.h>
20 #include <llvm/Support/raw_ostream.h>
21 
22 namespace llvm {
23 
24 class ThinLTOBitcodeWriterPass
25     : public PassInfoMixin<ThinLTOBitcodeWriterPass> {
26   raw_ostream &OS;
27   raw_ostream *ThinLinkOS;
28 
29 public:
30   // Writes bitcode to OS. Also write thin link file to ThinLinkOS, if
31   // it's not nullptr.
ThinLTOBitcodeWriterPass(raw_ostream & OS,raw_ostream * ThinLinkOS)32   ThinLTOBitcodeWriterPass(raw_ostream &OS, raw_ostream *ThinLinkOS)
33       : OS(OS), ThinLinkOS(ThinLinkOS) {}
34 
35   PreservedAnalyses run(Module &M, ModuleAnalysisManager &AM);
36 };
37 
38 } // namespace llvm
39 
40 #endif
41