lrproxy

A Libretro core that loads another core and intercepts all calls from a Libretro frontend to it, logging them to stderr as they happen.

Configuration

Edit lrproxy.c and change the PROXY_FOR macro at the top with the name of the core you want it to load.

Build

It's just two files, so just build a shared library out of them, using -DPROXY_FOR=dosbox_pure_libretro.so to specify the core you want it to load:

$ gcc -O2 -fPIC -shared -o proxy_core.so lrproxy.c dynlib.c

If the amount of logging is too much, use -DQUIET to make it less verbose.

TODO

Better logging of API arguments and returned values
Log environment calls

PRs welcome.

License

MIT, enjoy.

Log of RetroArch

This is the API log generated using lrproxy to load the DOSBox Pure core, with some notes from me.

As soon as core is loaded:

APILOG retro_get_system_info(0x7ffd4dc16e10)
APILOG retro_set_environment(0x55e41099b910) this one doesn't happen if a core and a content are being loaded from the cmdline
APILOG retro_set_environment(0x55e4109c8a30) different environment functions!

Content is loaded:

APILOG retro_init()
APILOG retro_load_game(0x555fa5bbc820) = 1
APILOG retro_set_video_refresh(0x555fa31317b0)
APILOG retro_set_audio_sample(0x555fa3103500)
APILOG retro_set_audio_sample_batch(0x555fa3103610)
APILOG retro_set_input_state(0x555fa3109960)
APILOG retro_set_video_refresh(0x555fa31317b0)
APILOG retro_set_audio_sample(0x555fa3103500)
APILOG retro_set_audio_sample_batch(0x555fa3103610)
APILOG retro_set_input_state(0x555fa3109960)
APILOG retro_api_version() = 1
APILOG retro_set_video_refresh(0x555fa31317b0)
APILOG retro_set_audio_sample(0x555fa3103500)
APILOG retro_set_audio_sample_batch(0x555fa3103610)
APILOG retro_set_input_state(0x555fa3118df0)
APILOG retro_set_input_poll(0x555fa3118dc0)
APILOG retro_get_system_av_info(0x555fa3bab1b0)
APILOG retro_get_system_info(0x7ffff748bab0)
APILOG retro_get_system_info(0x7ffff74848b0)
APILOG retro_set_environment(0x555fa3101910)
APILOG retro_set_environment(0x555fa312ea30)
APILOG retro_set_controller_port_device(0, 257)
APILOG retro_set_controller_port_device(1, 513)
APILOG retro_set_controller_port_device(2, 259)
APILOG retro_set_controller_port_device(3, 1)
APILOG retro_set_controller_port_device(4, 1)
APILOG retro_set_controller_port_device(5, 0)
APILOG retro_set_controller_port_device(6, 0)
APILOG retro_set_controller_port_device(7, 0)
APILOG retro_run() many of these of course

Content is closed:

APILOG retro_set_video_refresh(0x555fa31317b0)
APILOG retro_set_audio_sample(0x555fa3103500)
APILOG retro_set_audio_sample_batch(0x555fa3103610)
APILOG retro_set_input_state(0x555fa3118df0)
APILOG retro_get_system_info(0x7ffff74765e0)
APILOG retro_unload_game()
APILOG retro_deinit()
APILOG retro_get_system_info(0x7ffff7477610) core is unloaded and loaded again for a new content, but the UI says "no core"
APILOG retro_set_environment(0x555fa3101910)
APILOG retro_set_environment(0x555fa312ea30)