Implementing Forth | Bitwise Episode Guide

0:09Recap and set the stage for the day working on a FORTH system¹

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0:09Recap and set the stage for the day working on a FORTH system¹

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0:09Recap and set the stage for the day working on a FORTH system¹

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2:13Point out Sean's 1992 IOCCC entry 'FIRST & THIRD almost FORTH'² and others

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2:13Point out Sean's 1992 IOCCC entry 'FIRST & THIRD almost FORTH'² and others

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2:13Point out Sean's 1992 IOCCC entry 'FIRST & THIRD almost FORTH'² and others

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10:17Point out Lennart Augustsson's 1996 IOCCC entry 'august'³

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10:17Point out Lennart Augustsson's 1996 IOCCC entry 'august'³

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10:17Point out Lennart Augustsson's 1996 IOCCC entry 'august'³

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12:55Point out JONESFORTH⁴ with a little comparison with Sean's 'FIRST & THIRD almost FORTH'⁵

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12:55Point out JONESFORTH⁴ with a little comparison with Sean's 'FIRST & THIRD almost FORTH'⁵

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12:55Point out JONESFORTH⁴ with a little comparison with Sean's 'FIRST & THIRD almost FORTH'⁵

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18:24Review the addition of if in the assembler

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18:24Review the addition of if in the assembler

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18:24Review the addition of if in the assembler

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20:02Set up to implement our FORTH system, creating forth.asm, forth_test() and assemble_file()

34:57Run it to see that it looks good

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34:57Run it to see that it looks good

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34:57Run it to see that it looks good

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35:18FORTH, as a stack-oriented language

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35:18FORTH, as a stack-oriented language

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35:18FORTH, as a stack-oriented language

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37:32Introduce cmd_reg() to support register aliasing

39:54Test our new .reg instruction

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39:54Test our new .reg instruction

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39:54Test our new .reg instruction

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40:34Set up FORTH register roles: sp (stack pointer), pc (program counter) and rsp (return stack pointer)

43:28Indirect threading-style FORTH, like JONESFORTH⁶

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43:28Indirect threading-style FORTH, like JONESFORTH⁶

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43:28Indirect threading-style FORTH, like JONESFORTH⁶

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47:16Create an add routine, initially in direct threading style

53:30Set aside space for the stack

56:57Rename add to do_add and introduce do_push to push values onto the stack

1:00:51Enable cmd_uint32() to support variable initialisation from labels

1:02:53Run it to find that it assembled, but unexpectedly subtracts 8 from t1

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1:02:53Run it to find that it assembled, but unexpectedly subtracts 8 from t1

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1:02:53Run it to find that it assembled, but unexpectedly subtracts 8 from t1

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1:05:16Consider what may be wrong with cmd_la()

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1:05:16Consider what may be wrong with cmd_la()

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1:05:16Consider what may be wrong with cmd_la()

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1:07:19Run it and talk through the program execution

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1:07:19Run it and talk through the program execution

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1:07:19Run it and talk through the program execution

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1:08:34Step through cmd_la() and inspect the asm

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1:08:34Step through cmd_la() and inspect the asm

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1:08:34Step through cmd_la() and inspect the asm

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1:12:07Test loading into t1 from the program_start label

1:12:29Run it to find that this works, and it is loading correctly after all, only the disassembler doesn't account for the offset

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1:12:29Run it to find that this works, and it is loading correctly after all, only the disassembler doesn't account for the offset

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1:12:29Run it to find that this works, and it is loading correctly after all, only the disassembler doesn't account for the offset

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1:14:02Run our entire FORTH system

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1:14:02Run our entire FORTH system

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1:14:02Run our entire FORTH system

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1:16:06Create a do_print routine

1:18:12Run it to see our printout

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1:18:12Run it to see our printout

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1:18:12Run it to see our printout

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1:18:59Rename do_print to do_emit and enable it to print a newline and subtract '0' from the ASCII value

1:20:34Run it to see ILLEGAL instructions

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1:20:34Run it to see ILLEGAL instructions

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1:20:34Run it to see ILLEGAL instructions

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1:21:35Call do_push after do_add instructions

1:22:19Run it to look for our printout

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1:22:19Run it to look for our printout

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1:22:19Run it to look for our printout

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1:22:58Fix our program to + '0'

1:23:04Run it to see our 3

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1:23:04Run it to see our 3

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1:23:04Run it to see our 3

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1:23:38Enable cmd_loop() to toggle "quiet" running on a key press

1:24:49Rename do_emit to do_putchar and create a do_getchar routine

1:25:39Run it to see our 3

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1:25:39Run it to see our 3

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1:25:39Run it to see our 3

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1:25:47Enable our program to add user-input values

1:26:53Run it to see that it doesn't work

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1:26:53Run it to see that it doesn't work

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1:26:53Run it to see that it doesn't work

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1:27:05Fix our input handling

1:28:15Step through our program to see how it handles our input

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1:28:15Step through our program to see how it handles our input

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1:28:15Step through our program to see how it handles our input

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1:30:29Fix our program to do_add the final '0'

1:30:49Run it to see that it's correct

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1:30:49Run it to see that it's correct

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1:30:49Run it to see that it's correct

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1:31:09Direct and indirect threading

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1:31:09Direct and indirect threading

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1:31:09Direct and indirect threading

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1:34:05That's all we have time for today

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1:34:05That's all we have time for today

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1:34:05That's all we have time for today

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