reverse_pc_lookup_cache.h

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// 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_