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author Aaron Giles <aaron@aarongiles.com>2010-08-19 06:57:51 +0000
committer Aaron Giles <aaron@aarongiles.com>2010-08-19 06:57:51 +0000
commitdd19e512c03c58a100ae5025c9fd7624387667fd (patch)
tree28462fd2aa1b3a76b823d5c21ce65678085e6c8f /src/emu/debug/debugcmd.h
parentbf9afe4c4bb2112d706452c7b73bd8ebce16e3e0 (diff)
Massive memory system change. This is another step along the path toward
supporting cleaner implementations of drivers in the explicitly OO world. Expect a follow-on of several more changes to clean up from this one, which deliberately tried to avoid touching much driver code. Converted address_space to a class, and moved most members behind accessor methods, apart from space->machine and space->cpu. Removed external references to 8le/8be/16le/16be/32le/32be/64le/64be. All external access is now done via virtual functions read_byte()/read_word()/etc. Moved differentiation between the endianness and the bus width internal to memory.c, and also added a new axis to support small/large address spaces, which allows for faster lookups on spaces smaller than 18 bits. Provided methods for most global memory operations within the new address_space class. These will be bulk converted in a future update, but for now there are inline wrappers to hide this change from existing callers. Created new module delegate.h which implements C++ delegates in a form that works for MAME. Details are in the opening comment. Delegates allow member functions of certain classes to be used as callbacks, which will hopefully be the beginning of the end of fetching the driver_data field in most callbacks. All classes that host delegates must derive from bindable_object. Today, all devices and driver_data do implicitly via their base class. Defined delegates for read/write handlers. The new delegates are always passed an address_space reference, along with offset, data, and mask. Delegates can refer to methods either in the driver_data class or in a device class. To specify a callback in an address map, just use AM_READ_MEMBER(class, member). In fact, all existing AM_ macros that take read/write handlers can now accept delegates in their place. Delegates that are specified in an address map are proto-delegates which have no object; they are bound to their object when the corresponding address_space is created. Added machine->m_nonspecific_space which can be passed as the required address_space parameter to the new read/write methods in legacy situations where the space is not provided. Eventually this can go away but we will need it for a while yet. Added methods to the new address_space class to dynamically install delegates just like you can dynamically install handlers today. Delegates installed this way must be pre-bound to their object. Moved beathead's read/write handlers into members of beathead_state as an example of using the new delegates. This provides examples of both static (via an address_map) and dynamic (via install_handler calls) mapping using delegates. Added read/write member functions to okim6295_device as an example of using delegates to call devices. Updated audio/williams.c as a single example of calling the device via its member function callbacks. These will be bulk updated in a future update, and the old global callbacks removed. Changed the DIRECT_UPDATE_CALLBACKs into delegates as well. Updated all users to the new function format. Added methods on direct_read_data for configuring the parameters in a standard way to make the implementation clearer. Created a simple_list template container class for managing the common singly-linked lists we use all over in the project. Many other internal changes in memory.c, mostly involving restructuring the code into proper classes.
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