lld/MachO/UnwindInfoSection.h

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