Subject: Re: [stella] DASM wish list From: "C. Bond" <cbond@xxxxxxxxxxxxx> Date: Tue, 16 Aug 2005 12:36:28 -0400 |
-----Original Message----- From: "B. Watson" <atari@xxxxxxxxxxxxxx> Sent: Aug 16, 2005 6:55 AM To: stella@xxxxxxxxxxxxxxxxxx Subject: Re: [stella] DASM wish list On Mon, 15 Aug 2005, C. Bond wrote: > ...especially if your opcode list includes all > the unofficial opcodes. In some cases you may have to rewrite your source code > to change labels such as SAX, DCP, etc. so they don't conflict with opcodes. > It might be better to simply separate labels from opcodes by a formatting rule. > (Maybe not, just a thought!) Illegal opcode support ought to be something you can turn off, either from the command line or with a directive in your source. At one time there was talk of doing this in DASM, but I can't remember whether it actually happened... > Another issue has to do with using opcode syntax such as LSR A and > ROL A. If your assembler simply requires LSR or ROL, you can free > up 'A' for use as a label, otherwise it becomes a reserved symbol. I don't think anyone who codes for the VCS also smokes crack, so we don't have to worry about that: non-crackheads know better than to use a label that conflicts with a register name! Just because something's allowed doesn't mean it's a good idea, and I'm willing to bet we won't run into any old code that has labels called A, X, or Y... [snip] In fact, I have bet that: I unconditionally treat A, X, Y, S, and PC as registers in the Stella debugger. I thought about it a lot, and decided that the inconvenience of having to type a "sigil" character (maybe ".A" or "%A" for accumulator, as opposed to just plain "A") doesn't outweigh the possible compatibility problems dealing with a drug-influenced label called "A"... Everyone's going to have to refer to the accumulator a zillion times, but only the insane people are going to have a label called "A". I won't punish the many for the crimes of the few. --------------- Well, in my post I did not state a preference. I only pointed out that there are tradeoffs. However, I certainly don't recommend making things easier for "crackheads" or the "insane". You have a clear concept of what is convenient for the many and what weighs more heavily than what in assembler syntax specifications. I have no argument against your preferences, I simply pointed out as you did, that some decisions involve the selection of reserved symbols. -- B. Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://stella.biglist.com Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://stella.biglist.com
Current Thread |
---|
|
<- Previous | Index | Next -> |
---|---|---|
Re: [stella] DASM wish list, C. Bond | Thread | Re: [stella] DASM wish list, xucaen |
Re: [stella] DASM wish list, C. Bond | Date | Re: [stella] DASM wish list, xucaen |
Month |