[Ql-Users] Where is SBASIC?
Dear list I am working on an SBASIC editing tool (initially in SBASIC itself) under SMSQ/E (QPC 2). I'm currently trying to find my way around the SBASIC (Job0 or otherwise) job area and am confused by the locations of the various areas within the SBASIC job itself. Here's an example from a fairly long SBASIC daughter job (sorry about the possibly screwed-up spacing): AreaLength St End Input buf 10 256 266 Token buf61280 1286 Program 23830 123544147374 Name table2856 89800 92656 Name list 2889 59848 62737 Variables 4080-3110136 -3106056 Channels 200 -179720 -179520 Return 24 -790456 -790432 Lines0 0 0 How is it that some of these areas lie well outside of the traditional SBASIC job area? I have my own ideas, but hoped someone here (Marcel?) might be able to shed some light on how and where SBASIC is laid-out in SMSQ/E. Also, the Job 0 pointed-to from the system variables appears to be a 'dummy' job header+job area (640 bytes, regardless of whats loaded in Job 0). I supoose all I really need to know (beyond satisfying my curiosity) is: a) Can I rely on the pointers above - from peek_l(\\...) - to find the actual table data? b) Is there a SBASIC job-size stored in any _one_ place (as opposed to adding up the 'Length' bits above) Thanks for any insights ;-) Martyn Hill London. -- "There are 10 types of people in this world. Those who understand binary and those who don't." ___ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
Re: [Ql-Users] Where is SBASIC?
Martyn Hill wrote: > How is it that some of these areas lie well outside of the traditional > SBASIC job area? > > I have my own ideas, but hoped someone here (Marcel?) might be able to > shed some light on how and where SBASIC is laid-out in SMSQ/E. Frankly for me it's all pretty hazy what you're trying to do or asking here. The sources of the SBASIC interpreter are out there and usually well enough commented, though I concur that many things are still not easy to understand ;-) Generally everything in Basic is always relative to a Basic-area base pointer. This is at a fixed offset from the JCB for SBasic jobs. I'm not sure how job 0 is handled. The SBasic job working areas are generally allocated from the common heap, so they are a) discontinuous and b) might be below A6 (therefore negative offsets are possible). > b) Is there a SBASIC job-size stored in any _one_ place (as opposed > to adding up the 'Length' bits above) No. But why would one want to know this? Cheers, Marcel ___ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
