bss_relocs.h

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// Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
 
#ifndef RUNTIME_VM_BSS_RELOCS_H_
#define RUNTIME_VM_BSS_RELOCS_H_
 
#include "platform/allocation.h"
 
namespace dart {
class Thread;
 
class BSS : public AllStatic {
 public:
  // Entries found in both the VM and isolate BSS come first. Each has its own
  // portion of the BSS segment, so just the indices are shared, not the values
  // stored at the index.
  enum class Relocation : intptr_t {
    DRT_GetFfiCallbackMetadata,  // TODO(https://dartbug.com/52579): Remove.
    DRT_ExitTemporaryIsolate,    // TODO(https://dartbug.com/52579): Remove.
    EndOfVmEntries,
 
    // We don't have any isolate group specific entries at the moment.
    EndOfIsolateGroupEntries = EndOfVmEntries,
  };
 
  static constexpr intptr_t kVmEntryCount =
      static_cast<intptr_t>(Relocation::EndOfVmEntries);
 
  static constexpr intptr_t kIsolateGroupEntryCount =
      static_cast<intptr_t>(Relocation::EndOfIsolateGroupEntries);
 
  static constexpr intptr_t RelocationIndex(Relocation reloc) {
    return static_cast<intptr_t>(reloc);
  }
 
  static void Initialize(Thread* current, uword* bss, bool vm);
 
  // Currently only used externally by LoadedElf::ResolveSymbols() to set the
  // relocated address without changing the embedder interface.
  static void InitializeBSSEntry(BSS::Relocation relocation,
                                 uword new_value,
                                 uword* bss_start);
};
 
}  // namespace dart
 
#endif  // RUNTIME_VM_BSS_RELOCS_H_