63 lines
4.2 KiB
Plaintext
63 lines
4.2 KiB
Plaintext
[video member=pervognsen stream_platform=twitch project=bitwise title="Forth Implementation, Part 5" vod_platform=youtube id=4Uy1Mq8p72w annotator=Miblo]
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[0:08][Recap and set the stage for the day focusing on bootstrapping][:speech]
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[1:39][Review the in-progress bootstrapping of the immediate / compilation modality interpretation][:asm :research]
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[8:16][Make "immediate" itself be immediate][:asm]
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[9:50][Review the new immediate words "else", "begin", "again", "until", "variable" and "constant"][:asm :research]
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[14:59][Demo the idea behind counter and if-else][:asm :run]
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[16:12][Determine to work on "immediate?" with a mention of a "hiding" word][:asm :speech]
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[18:15][Create "immediate?" in FORTH][:asm]
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[19:50][:Run it to find that it works, and remove the hard coded definition][:asm]
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[20:57][Consider kicking out the ladder from under us once we're bootstrapped][:asm :speech]
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[25:02][Define defop2 macro to quickly define binary operators, using it on an "+" operator][:asm]
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[26:54][:Run it to find that it works][:asm]
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[27:02][Define "-", "and", "or" and "xor" operators][:asm]
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[27:46][:Run it to find that it works][:asm]
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[27:56][Define defop1 macro to quickly define unary operators, using it to define "0=" and "<>0"][:asm]
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[29:53][:Run it to find that it works][:asm]
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[30:05][Alias "not" as "0="]
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[31:24][:Run it to find that it works, but that we may want to bootstrap error checking][:asm :"error handling"]
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[31:53][Create ">flags"][:asm]
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[32:55][:Run it to find that it broke everything][:asm]
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[33:28][Make ">flags" just exit for now][:asm]
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[33:42][Consider creating ">cfa" and integers][:asm :speech]
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[35:57][Rewrite ">flags"][:asm]
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[36:17][:Run it to find that it now works][:asm]
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[36:23][Revert ">flags" to just exit, and create ">namelen", ">name" and ">cfa"][:asm]
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[41:33][:Run it to find that the live ">cfa" doesn't work][:asm]
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[41:52][Test ">namelen" and ">name"][:asm]
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[42:05][:Run it to find that it's okay][:asm]
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[42:26][Remove IMMEDIATE and HIDDEN initialisations][:asm]
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[42:40][:Run it to make sure that doesn't break it][:asm]
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[42:52][Scrutinise ">cfa" and start our investigations by putting the location of the "drop" word on the stack][:asm]
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[44:56][:Run it to see that "drop" is at 1224][:asm]
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[45:20][Try to dup our ">cfa" after finding the "drop" word][:asm]
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[45:50][:Run it to find that the cfa is at 1852402392][:asm]
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[46:01][Try dereferencing the ">namelen"][:asm]
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[46:14][:Run it to determine that it's already total garbage][:asm]
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[46:22][Try to dup ">namelen" itself][:asm]
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[46:26][:Run it to see that this is as expected][:asm]
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[46:51][Make ">cfa" correctly dereference ">namelen" using a byte fetch][:asm]
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[47:04][:Run it to see that it works][:asm]
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[48:17][Determine to create a general number parser, initially redefining "interpret" and "quit"][:asm :parsing]
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[51:46][:Run it to find that it didn't work][:asm]
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[52:12][Investigate the problem in our new "interpret" and "quit"][:asm :programming :run]
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[57:45][Using "break" within \[ and \]][:asm :speech]
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[58:36][Continue to investigate "interpret"][:asm :programming :run]
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[59:42][Try increasing the stack size][:asm :memory]
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[1:00:16][:Run it to find that it works][:asm]
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[1:00:37][Try using our new "quit"][:asm]
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[1:00:56][:Run it to find that it all works, with a few words on recreating more sophisticated definitions][:asm]
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[1:02:07][Consider building better :"error handling"][:asm :speech]
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[1:03:22][Define register-manipulation built-ins "sp\@", "sp!", "pc\@", "pc!", "rp\@" and "rp!"][:asm]
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[1:08:04][:Run it to see that it works][:asm]
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[1:08:08][Define "sp0" and "rp0", and introduce an abort function][:asm]
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[1:13:28][:Run it to see that "abort" has put 1234 on the stack, but it ends by crashing in bus_load_word()][:asm]
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[1:14:08][Investigate the crash in "abort"][:asm :research]
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[1:21:33][Initialise sp0 and rp0 for the docol routine and "rp0" word to use][:asm]
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[1:23:11][:Run it to see that it is more reasonable][:asm]
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[1:24:31][Prevent "abort" from putting 1234 on the stack, and try to enable it to push the code pointer for "quit" onto the return stack, rather than calling it directly][:asm]
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[1:25:08][:Run it to find that it didn't work][:asm]
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[1:25:49][Revert "abort" to just quit][:asm]
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[1:26:41][Cut off the main stream][:speech]
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[/video]
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