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-rw-r--r--src/emu/emumem_hep.h48
1 files changed, 48 insertions, 0 deletions
diff --git a/src/emu/emumem_hep.h b/src/emu/emumem_hep.h
new file mode 100644
index 00000000000..11da1dc2bca
--- /dev/null
+++ b/src/emu/emumem_hep.h
@@ -0,0 +1,48 @@
+// license:BSD-3-Clause
+// copyright-holders:Olivier Galibert
+
+// handler_entry_read_passthrough/handler_entry_write_passthrough
+
+// parent class for handlers which want to tap the access and usually pass it on to another handler
+
+template<int Width, int AddrShift, int Endian> class handler_entry_read_passthrough : public handler_entry_read<Width, AddrShift, Endian>
+{
+public:
+ using uX = typename handler_entry_size<Width>::uX;
+
+ handler_entry_read_passthrough(address_space *space, memory_passthrough_handler &mph) : handler_entry_read<Width, AddrShift, Endian>(space, handler_entry::F_PASSTHROUGH), m_mph(mph), m_next(nullptr) {}
+ ~handler_entry_read_passthrough();
+
+ virtual handler_entry_read_passthrough<Width, AddrShift, Endian> *instantiate(handler_entry_read<Width, AddrShift, Endian> *next) const = 0;
+
+ handler_entry_read<Width, AddrShift, Endian> *get_subhandler() const { return m_next; }
+
+ void detach(const std::unordered_set<handler_entry *> &handlers) override;
+
+protected:
+ memory_passthrough_handler &m_mph;
+ handler_entry_read<Width, AddrShift, Endian> *m_next;
+
+ handler_entry_read_passthrough(address_space *space, memory_passthrough_handler &mph, handler_entry_read<Width, AddrShift, Endian> *next) : handler_entry_read<Width, AddrShift, Endian>(space, handler_entry::F_PASSTHROUGH), m_mph(mph), m_next(next) { next->ref(); mph.add_handler(this); }
+};
+
+template<int Width, int AddrShift, int Endian> class handler_entry_write_passthrough : public handler_entry_write<Width, AddrShift, Endian>
+{
+public:
+ using uX = typename handler_entry_size<Width>::uX;
+
+ handler_entry_write_passthrough(address_space *space, memory_passthrough_handler &mph) : handler_entry_write<Width, AddrShift, Endian>(space, handler_entry::F_PASSTHROUGH), m_mph(mph), m_next(nullptr) {}
+ ~handler_entry_write_passthrough();
+
+ virtual handler_entry_write_passthrough<Width, AddrShift, Endian> *instantiate(handler_entry_write<Width, AddrShift, Endian> *next) const = 0;
+
+ handler_entry_write<Width, AddrShift, Endian> *get_subhandler() const { return m_next; }
+
+ void detach(const std::unordered_set<handler_entry *> &handlers) override;
+
+protected:
+ memory_passthrough_handler &m_mph;
+ handler_entry_write<Width, AddrShift, Endian> *m_next;
+
+ handler_entry_write_passthrough(address_space *space, memory_passthrough_handler &mph, handler_entry_write<Width, AddrShift, Endian> *next) : handler_entry_write<Width, AddrShift, Endian>(space, handler_entry::F_PASSTHROUGH), m_mph(mph), m_next(next) { next->ref(); mph.add_handler(this); }
+};