1 //===- UnwindInfoSection.h ------------------------------------------------===//
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 #ifndef LLD_MACHO_UNWIND_INFO_H
10 #define LLD_MACHO_UNWIND_INFO_H
11 
12 #include "ConcatOutputSection.h"
13 #include "SyntheticSections.h"
14 #include "llvm/ADT/MapVector.h"
15 
16 #include "mach-o/compact_unwind_encoding.h"
17 
18 namespace lld {
19 namespace macho {
20 
21 class UnwindInfoSection : public SyntheticSection {
22 public:
23   // If all functions are free of unwind info, we can omit the unwind info
24   // section entirely.
25   bool isNeeded() const override { return !allEntriesAreOmitted; }
26   void addSymbol(const Defined *);
27   virtual void prepare() = 0;
28 
29 protected:
30   UnwindInfoSection();
31 
32   llvm::MapVector<std::pair<const InputSection *, uint64_t /*Defined::value*/>,
33                   const Defined *>
34       symbols;
35   bool allEntriesAreOmitted = true;
36 };
37 
38 UnwindInfoSection *makeUnwindInfoSection();
39 
40 } // namespace macho
41 } // namespace lld
42 
43 #endif
44