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 namespace lld::macho {
17 
18 class UnwindInfoSection : public SyntheticSection {
19 public:
20   // If all functions are free of unwind info, we can omit the unwind info
21   // section entirely.
isNeeded()22   bool isNeeded() const override { return !allEntriesAreOmitted; }
23   void addSymbol(const Defined *);
24   virtual void prepare() = 0;
25 
26 protected:
27   UnwindInfoSection();
28 
29   llvm::MapVector<std::pair<const InputSection *, uint64_t /*Defined::value*/>,
30                   const Defined *>
31       symbols;
32   bool allEntriesAreOmitted = true;
33 };
34 
35 UnwindInfoSection *makeUnwindInfoSection();
36 
37 } // namespace lld::macho
38 
39 #endif
40