reverse_pc_lookup_cache.h

// Copyright (c) 2018, 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_REVERSE_PC_LOOKUP_CACHE_H_
#define RUNTIME_VM_REVERSE_PC_LOOKUP_CACHE_H_

#include "vm/allocation.h"
#include "vm/globals.h"
#include "vm/raw_object.h"
#include "vm/tagged_pointer.h"

namespace dart {

class IsolateGroup;

// This class provides mechanism to find Code and CompressedStackMaps
// objects corresponding to the given PC.
// Can only be used in AOT runtime with bare instructions.
class ReversePc : public AllStatic {
 public:
  // Looks for Code object corresponding to |pc| in the
  // given isolate |group| and vm isolate group.
  static CodePtr Lookup(IsolateGroup* group, uword pc, bool is_return_address);

  static const UntaggedCompressedStackMaps::Payload* FindStackMap(
      IsolateGroup* group,
      uword pc,
      bool is_return_address,
      uword* code_start,
      const UntaggedCompressedStackMaps::Payload** global_table);

 private:
  static const UntaggedCompressedStackMaps::Payload* FindStackMapInGroup(
      IsolateGroup* group,
      uword pc,
      bool is_return_address,
      uword* code_start,
      const UntaggedCompressedStackMaps::Payload** global_table);

  static CodePtr FindCodeInGroup(IsolateGroup* group,
                                 uword pc,
                                 bool is_return_address);
  static CodePtr FindCode(IsolateGroup* group,
                          uword pc,
                          bool is_return_address);
};

}  // namespace dart

#endif  // RUNTIME_VM_REVERSE_PC_LOOKUP_CACHE_H_