Popular Windows tools for stack unwinding lack support for the DWARF
debug format. Unwinding the stack without DWARF is unreliable without
frame pointers. Default frame pointers to enabled for Windows so that
these tools work despite their lack of DWARF support.
`struct object_rw` is poisoned prior to initializing and sending it.
However, some fields are legitimately unininitialized (other than their
memset or poison value) at send time. Add and use a poison variant that
can clear those fields, without marking them unreadable.
This is in a redundant check, as we shouldn't (and don't) call newdemo_record_start_frame if nd_record_v_no_space is true, i.e. we ran out of disk space recording a demo. We want to return window_event_result::close with every call to newdemo_stop_playback() to close the game, as this is safer than calling window_close on the game window within its handler. In this case, it's much simpler (and safe) to just remove it.
Even if newdemo_record_start_frame is called when nd_record_v_no_space is true, we don't want to close the game, just exit the function.
Replace calls to window_close(Game_wind) with returning window_event_result::close to game handler. Applies to when DoEndGame() is called, DoGameOver() is called, aborting in the kmatrix screen (multiplayer game) during AdvanceLevel() and playing one demo frame causes playback to stop in GameProcessFrame(). Closing a window within its handler is problematic - it can result in an unstable state.
Old versions of Rebirth sometimes saved games with bogus object data,
such that `obj->type == OBJ_NONE`, but `obj->movement_type`,
`obj->control_type`, or `obj->render_type` were not their respective
*_NONE constants. This confused the game loader code such that it would
load invalid data from the `mtype`, `ctype`, or `rtype` unions and use
it without checking.
Try to counter some of this by exiting early if the object has type
OBJ_NONE.
Clang rejects a declared (but never defined and never used) `static`
function. Change the declaration to be the value of a macro that will
be expanded only when the function is both defined and used.
Reported-by: kreatordxx <https://github.com/dxx-rebirth/dxx-rebirth/issues/295>
Fixes: 55822d0b4d ("Add wrappers for more precise Valgrind physfs diagnostics")
These flags are passed through to the underlying build, but not checked
by the SConf tests. They are meant for options which will work in the
main build, but fail in the configure environment, such as `-Wl,--wrap`.
Valgrind warns when writing uninitialized data to a file. The Descent
savegame format requires writing certain fields that are no longer used.
Set those fields to 0 to prevent leaking stack data into the file.
Levels which fit in MAX_SEGMENTS_ORIGINAL read exactly
MAX_SEGMENTS_ORIGINAL segments worth of light_subtracted, even though
fewer segments were defined. Prepare light_subtracted into a temporary
stack buffer instead of doing byte-at-a-time writes. Initialize this
stack buffer to 0 when necessary. Write the buffer once it is fully
prepared.
player_info::cloak_time is only defined if the player is cloaked.
player_info::invulnerable_time is only defined if the player is
invulnerable.
In both cases, the game save code tried to read the ::*_time variable
even when it was undefined. Modify the saving code to check player
flags before reading the associated timer.
zicodxx reports that f7d0c85 made the thief bot passive and timid.
His analysis suggests that the problem is because f7d0c85 changed
find_connected_distance to return vm_distance::maximum_value() in places
where it previously returned magic values that were not maximum (caching
a distance of F1_0*1000 and returning a distance of -1). Rather than
try to fix the underlying code that relied on these magic values, revert
those return paths to return these unusual values. Move the unusual
values to named constants in file scope so that they are easier to find
and correlate.
Reported-by: zicodxx <https://github.com/dxx-rebirth/dxx-rebirth/issues/286>
Analyzed-by: zicodxx
Fixes: f7d0c853ba ("Use special types for distance/magnitude")
