expect the 'net will be flooded with hacked versions of Battlezone that
give you infinite lives :)
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Every cart type is going to have to support this by having a getImage()
method that returns the size of and pointer to its internal ROM image
array. Currently only Cartridge4K supports it, but it does work.
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common conditions such as "joystick 0 pressed to the left" (this would
be "_joy0left"). To see the list, type "help".
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a modifier (such as Shift). This allows us to actually type a ~ character
in the debugger (our unary NOT operator!).
git-svn-id: svn://svn.code.sf.net/p/stella/code/trunk@695 8b62c5a3-ac7e-4cc8-8f21-d9a121418aba
...but we need them in the Expression classes and the DebuggerParser.
Expressions now return uInt16 instead of int. This gets us 6502-like
behaviour when dealing with numbers that don't fit into the 6502's 16-bit
address space. -1 in 6502-speak is equal to $ffff (twos' complement); this
is exactly what happens in C++ if you try to assign -1 to an unsigned
short (aka a uInt16). I believe the C++ standard doesn't *require*
conforming implementations to use twos' complement math, but I doubt
anyone will ever port Stella to any hardware old or esoteric enough to
use anything else.
Also, I've added casts to uInt8 to the debugger commands that set
registers. This also results in 6502-like handling of negative numbers:
using "a -2" to set the Accumulator will result in it having the value
$fe, which is exactly correct for a 6502. This may seem like undesirable
behaviour (and in a regular C++ program, when it happens by accident,
it IS undesired), but trust me, this is exactly what a 6502 assembly
programmer would expect.
Also also, I got rid of the distinction between commands that take a byte
or word argument. They all take words now. I had to do this to make the "a
-2" example work. A side effect is that you can now say something like "a
$1234" and the value will get truncated to $34 (due to the cast to uInt8).
What remains to be seen is whether all this behaves the way I think it
should on a big-endian platform (e.g. the Mac). My poor Mac is having
cooling issues, so I can't actually compile Stella any more :(
However, I can get it to run long enough to compile a little 5-10
line test program to see how these casts work. If I'm wrong, and they
behave differently on the Mac, I'll have to add platform-dependent
"uInt16_to_uInt8" type functions, which I'd really rather avoid...
But the debugger has GOT to treat negative and out-of-range values the
same way as a 6502 does.
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In the process, I've discovered a bug in the argument processing: any of
the commands that use kARG_FILE as their first argument will work *only*
if they're the first command issued after starting Stella, otherwise
they segfault. Am investigating this now
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the TIA image to show frame/scanline related info. In the future,
this area will also show a zoomed region of the current TIA image,
as well as a small message window.
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Currently they only show up in the prompt, but the TIA and TIADebug
have support for getting the current pixel clock (clocksThisLine()). The
pixel and CPU cyc are derived from the pixel clock.
Actually it's acting a bit funny, I need to find out why...
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> function joy0right { !(*SWCHA & $80) }
> breakif joy0right
After deleting the breakif, joy0right is still defined, so you can use it
again...
At some point I plan to create a standard startup script full of useful
functions like joy0right. Also at some point functions will support
arguments...
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today (I was supposed to be working on the TIA stuff and I
haven't even touched it yet). I think we have to accept that
software mode in Windows just isn't as fast as Linux (yay!),
and suggest not to use high resolutions in software mode.
Normal resolutions of 800x600 or below are fine; it's just
1024x768 and above that causes problems.
The good news is that OpenGL mode in Windows works better than
it ever did. Hopefully this will take care of that other weird
OpenGL problem that I could never track down ...
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finally got it this time. And as a nice side effect, it seems
that switching between debugger/emulation/launcher is working
in fullscreen Windows mode.
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quite fast, and is approaching software rendering speed for lower
resolutions. In higher resolutions, OpenGL always beats software
mode.
Screen redraws are now done as rarely as possible. For example,
when switching to menu/debugger mode or pausing emulation, CPU
usage normally drops to almost nothing.
This hasn't been tested in Windows yet, so I'm sure there'll be
some issues (there always are ...)
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and contains the entire asm source, plus line number/file and address
for each line.
Currently, you can either "loadlist file.lst" or else name your listing
file "romname.lst" (e.g. "dasm foo.asm -ofoo.bin -sfoo.sym -lfoo.lst").
Once loaded, you can say "list myAddress" and see that address's source
plus a few lines before & after for context.
This is a long way from true source-level debugging, but it's a start.
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pretty much only works for my specific setup, I think. In the future,
the regular configure script will support cross-compiling.
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screen, which means that the area right of the TIA image can be used
for widgets (that's the next thing I'll be doing).
Created TiaOutputWidget, which is contained in the DebuggerDialog
and handles all drawing/updating of the TIA image while in
debugger mode. Some advantages of this are a greatly simplified
FrameBuffer::update() wrt debugger mode and instant updates for frame
and scanline advance. Another big advantage is that the TIA image
is now a widget, which means it can receive key/mouse events. These
events can trigger updates in other parts of the interface (imagine
clicking on a certain line and having scanlines filled to that
area, etc). The biggest disadvantage right now is that the TIA is
redrawn each time the dialog changes (ie, when a key is pressed).
This needs to be optimized.
Fixed bug whereby toggling video modes while in the debugger
sometimes screwed up the palette.
Removed some FIXME's, since the functionality has been provided.
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when we hit a trap or a breakif. This fix is kind of hackish, I've got
to come up with a better way to do it.
Improved behaviour of greying-out frame in updateScanline(). It's still
not quite right.
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to *(foo+bar), just like it is in C.
Added _bank special "variable" to expression syntax. It returns the current
bank, so you can set bankswitching breakpoints:
breakif {_bank==1 && pc==whatever}
It looks like I'm going to be using _ as a prefix that means "special
meaning; reserved; don't use in your program", just like C does. Some
existing games might need to be rewritten if they use _bank or _scan as
a label... but it'll be well worth the price, to the game author.
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"breakif _scan==whatever" (break on given scanline). Eventually it'll
let us get at a lot of internal TIA state.
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need the numbers so you can refer to them (e.g. delete them).
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configure-cross is my temporary work-in-progress of the configure
script, I don't want to replace the real configure script yet because
configure-cross is probably broken :(
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must have static versions of all the libraries (like libSDL.a, libz.a,
libpng.a), or else you'll end up with the dynamic version(s) of them... so
you'd have a stella binary that's almost-static.
Also, the only way I could get things to link properly was to include
-lz in the LIBS twice: once before and once after -lpng. Removing either
one causes the link to fail on my Linux box. This could cause issues
for other systems though, am not sure...
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file named "romfile.stella" in the current directory, it will be run
at startup.
Fixed memory leakage in YaccParser, when there was a parse error.
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Ladies and gentlemen, we have working conditional breakpoints! And they're
*fast*!
The command to use is "breakif". It takes one argument, the condition.
You can use curly braces if you want to include spaces in your arguments
(they don't do anything except help readability).
On the Athlon 2100, I was able to run the emulator at full speed, using
100% of the CPU, with *20* expressions of the form:
breakif a==101||a==102||a==103||a==104||a==105
Around 25 expressions, the game started getting noticeably jerky, but was
still playable. With 1 to 5 expressions, there was *no* noticeable increase
in CPU usage!
Actually, this can probably be improved on: I used gcc 3.2.2 for
this. With 3.3.x or 4.0.x, it should be even faster.
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command; no argument advances one scanline, else advances given #
of scanlines.
Made some methods in TIA inline. Don't know if this will have any
effect, but we'll try to be as efficient as possible.
Bumped version for the next pending alpha release.
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Added rudimentary error-checking to parser and lexer: we no longer accept
invalid digits. Also fixed bug that kept YaccParser from handling hex
constants correctly.
Still TODO is to provide more friendly error messages.
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The only slight weirdness is: if you're on frame X, and you hit Frame+1,
the prompt will tell you you're on scanline 262 of frame X. It actually
should probably say you're on scanline 0 of frame X+1. If you do a Scan+1
from that point, it'll say you're on scanline 1 of frame X (still X,
not X+1).
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advance and frame advance. There are still some issues though.
Specifically, scanline advancing past the end of the frame shouldn't
be allowed, and this is partially causing the problems with frame
'jumping' when doing a scanline advance after a frame advance.
Still TODO is add some visual cue to indicate which scanline is
being drawn, and which onscreen data is 'old' data.
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except it lets you keep advancing past the end of the frame.
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getting closer. I can change a color in the TiwWidget, advance a few
scanlines, then do a frame advance. The color changes show up only
after advancing the frame, so obviously TIA::update() is doing
something that TIA::updateScanline() isn't. Brian, any advice on
this one; it seems I don't know as much about the TIA as I
thought :(
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at a time. Of course, it doesn't actually do anything yet.
Logically, the algorithm is very simple (or at least I think it is).
I just have to figure out how to execute the 6502 until a scanline
is done. In the process, the internal buffers (and hence the
external FrameBuffer) will be filled with data, and we just do
a FrameBuffer::refreshTIA() to 'see' the changes. The first part
of this is the problem. Any advice Brian??
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However, we do leak memory: yyparse() happily allocates Expressions as
it parses, but when it hits a parse error, it doesn't return a valid
pointer to the top of the Expression tree. From what I can tell, the
so-called Expression* result is the int value of the last lexer token
cast to an Expression* (due to yacc's use of a union).
I know how to avoid the leak: we need to keep a vector of Expression
pointers in YaccParser. If there's a parse error, yyerror() can delete
all the Expressions using the vector. If not, we clear the vector (er,
calling .clear() on a vector doesn't delete all its elements, too,
does it?). Every time yacc says "$$ = new WhateverExpression", it also
should vector.push_back($$).
Will implement this tomorrow; am getting tired & flaky.
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to include spaces in arguments. "print 80" and "print {80}" are equivalent,
but "print 80 + 1" and "print {80 + 1}" are not (the former counts as 3
arguments, the latter only one).
Actually, I haven't tied the YaccParser to getArgs() yet, so both would
still be errors. I still need to fix the segfaults on parse error.
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Semi-fixed a bug: formatFlags was capitalizing the wrong flags. I'm
pretty sure it's because they were being pushed into the BoolArray in
reverse order. I "fixed" formatFlags by having it ignore the BoolArray,
and call my new CpuDebug methods to get the flag states directly.
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urchlay