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
  15 #include "mach-o/compact_unwind_encoding.h"
  16
  17 namespace lld {
  18 namespace macho {
  19
  20 template <class Ptr> struct CompactUnwindEntry {
  21   Ptr functionAddress;
  22   uint32_t functionLength;
  23   compact_unwind_encoding_t encoding;
  24   Ptr personality;
  25   Ptr lsda;
  26 };
  27
  28 class UnwindInfoSection : public SyntheticSection {
  29 public:
  30   bool isNeeded() const override {
  31     return !compactUnwindSection->inputs.empty() && !allEntriesAreOmitted;
  32   }
  33   uint64_t getSize() const override { return unwindInfoSize; }
  34   virtual void addInput(ConcatInputSection *) = 0;
  35   std::vector<ConcatInputSection *> getInputs() {
  36     return compactUnwindSection->inputs;
  37   }
  38   void prepareRelocations();
  39
  40 protected:
  41   UnwindInfoSection();
  42   virtual void prepareRelocations(ConcatInputSection *) = 0;
  43
  44   ConcatOutputSection *compactUnwindSection;
  45   uint64_t unwindInfoSize = 0;
  46   bool allEntriesAreOmitted = true;
  47 };
  48
  49 UnwindInfoSection *makeUnwindInfoSection();
  50
  51 } // namespace macho
  52 } // namespace lld
  53
  54 #endif