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+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <atomic>
+#include <mutex>
+#include <optional>
+#include <vector>
+#include "common/common_types.h"
+
+namespace Core::Timing {
+class CoreTiming;
+struct EventType;
+} // namespace Core::Timing
+
+namespace Tools {
+
+// A class that will effectively freeze memory values.
+class Freezer {
+public:
+ struct Entry {
+ VAddr address;
+ u32 width;
+ u64 value;
+ };
+
+ explicit Freezer(Core::Timing::CoreTiming& core_timing);
+ ~Freezer();
+
+ // Enables or disables the entire memory freezer.
+ void SetActive(bool active);
+
+ // Returns whether or not the freezer is active.
+ bool IsActive() const;
+
+ // Removes all entries from the freezer.
+ void Clear();
+
+ // Freezes a value to its current memory address. The value the memory is kept at will be the
+ // value that is read during this function. Width can be 1, 2, 4, or 8 (in bytes).
+ u64 Freeze(VAddr address, u32 width);
+
+ // Unfreezes the memory value at address. If the address isn't frozen, this is a no-op.
+ void Unfreeze(VAddr address);
+
+ // Returns whether or not the address is frozen.
+ bool IsFrozen(VAddr address) const;
+
+ // Sets the value that address should be frozen to. This doesn't change the width set by using
+ // Freeze(). If the value isn't frozen, this will not freeze it and is thus a no-op.
+ void SetFrozenValue(VAddr address, u64 value);
+
+ // Returns the entry corresponding to the address if the address is frozen, otherwise
+ // std::nullopt.
+ std::optional<Entry> GetEntry(VAddr address) const;
+
+ // Returns all the entries in the freezer, an empty vector means nothing is frozen.
+ std::vector<Entry> GetEntries() const;
+
+private:
+ void FrameCallback(u64 userdata, s64 cycles_late);
+ void FillEntryReads();
+
+ std::atomic_bool active{false};
+
+ mutable std::mutex entries_mutex;
+ std::vector<Entry> entries;
+
+ Core::Timing::EventType* event;
+ Core::Timing::CoreTiming& core_timing;
+};
+
+} // namespace Tools