Forth Implementation, Part 2 | Bitwise Episode Guide

0:08Recap and set the stage for the day

🗩

0:08Recap and set the stage for the day

🗩

0:08Recap and set the stage for the day

🗩

0:52Review the off-stream work on next and the addition of do_twice and docol with indirect threading in our FORTH implementation

📖

0:52Review the off-stream work on next and the addition of do_twice and docol with indirect threading in our FORTH implementation

📖

0:52Review the off-stream work on next and the addition of do_twice and docol with indirect threading in our FORTH implementation

📖

7:51Describe our test program and its control flow

📖

7:51Describe our test program and its control flow

📖

7:51Describe our test program and its control flow

📖

11:33Demo the program

🏃

11:33Demo the program

🏃

11:33Demo the program

🏃

12:25A few words on threading in JONESFORTH¹

🗩

12:25A few words on threading in JONESFORTH¹

🗩

12:25A few words on threading in JONESFORTH¹

🗩

13:15Implement user-defined words with indirect threading

16:53Run it and hit an "Expected instruction or command" error

🏃

16:53Run it and hit an "Expected instruction or command" error

🏃

16:53Run it and hit an "Expected instruction or command" error

🏃

17:11Change do_twice and do_jump to use .org + 8

17:38Run it and hit an "Operand must be constant" error

🏃

17:38Run it and hit an "Operand must be constant" error

🏃

17:38Run it and hit an "Operand must be constant" error

🏃

18:11Enable cmd_org() to parse address offsets

18:49Run it to see that it still works, recapping that change

🏃

18:49Run it to see that it still works, recapping that change

🏃

18:49Run it to see that it still works, recapping that change

🏃

19:35Rename the existing defword to defcode, and introduce a new defword to handle user-defined words

20:51Run it to see that it still works

🏃

20:51Run it to see that it still works

🏃

20:51Run it to see that it still works

🏃

21:01Up- / downsides of user-defined words

🗩

21:01Up- / downsides of user-defined words

🗩

21:01Up- / downsides of user-defined words

🗩

23:44Change defcode and defword to an indirect threading scheme

24:56Run it to see that it does work

🏃

24:56Run it to see that it does work

🏃

24:56Run it to see that it does work

🏃

25:05The minimum set of FORTH runtime semantics

🗩

25:05The minimum set of FORTH runtime semantics

🗩

25:05The minimum set of FORTH runtime semantics

🗩

26:27FORTH dictionary

🗩

26:27FORTH dictionary

🗩

26:27FORTH dictionary

🗩

31:57Defining a dictionary in FORTH, including its : and ; syntax

🗩

31:57Defining a dictionary in FORTH, including its : and ; syntax

🗩

31:57Defining a dictionary in FORTH, including its : and ; syntax

🗩

33:45Set up to implement dictionary

🗩

33:45Set up to implement dictionary

🗩

33:45Set up to implement dictionary

🗩

34:51Introduce cmd_str() and cmd_str() in the assembler

36:42Begin to implement dictionary entry

39:26Enable defcode and defword to support definition naming

43:04Run it and hit an "Unexpected token (null) in expression" error

🏃

43:04Run it and hit an "Unexpected token (null) in expression" error

🏃

43:04Run it and hit an "Unexpected token (null) in expression" error

🏃

44:35Add TOKEN_STR to the token_kind_names table

45:07Run it and step through to investigate the bug

🏃

45:07Run it and step through to investigate the bug

🏃

45:07Run it and step through to investigate the bug

🏃

47:55Fix defcode and defword to use $label rather than $name

48:14Run it to find that it doesn't still work

🏃

48:14Run it to find that it doesn't still work

🏃

48:14Run it to find that it doesn't still work

🏃

50:23Reorganise docol and fix init to initialise the rsp (return stack pointer)

52:36Run it to find that it handles our input

🏃

52:36Run it to find that it handles our input

🏃

52:36Run it to find that it handles our input

🏃

53:37Make defcode print the address and name

54:21Run it to see our defined codes, that reg 4 contains an odd-numbered address, and we get to an ILLEGAL instruction

🏃

54:21Run it to see our defined codes, that reg 4 contains an odd-numbered address, and we get to an ILLEGAL instruction

🏃

54:21Run it to see our defined codes, that reg 4 contains an odd-numbered address, and we get to an ILLEGAL instruction

🏃

56:17Note that JALR rounds to two-byte boundaries, and enable defcode to align 4 after the .str instruction

57:58Run it and step through the emulation to still see unaligned address

🏃

57:58Run it and step through the emulation to still see unaligned address

🏃

57:58Run it and step through the emulation to still see unaligned address

🏃

59:03Fix defcode to correctly compute the alignment

59:22Run it to find that our addresses are aligned, but our input is not being handled

🏃

59:22Run it to find that our addresses are aligned, but our input is not being handled

🏃

59:22Run it to find that our addresses are aligned, but our input is not being handled

🏃

1:00:36Fix both defword and defcode to compute the alignment in such a way that enables input handling to work

1:01:24Run it to see that it works

🏃

1:01:24Run it to see that it works

🏃

1:01:24Run it to see that it works

🏃

1:01:35Initialise our dictionary's latest field, introducing defentry and a find routine

1:18:25Spec out a find routine in pseudo-C code to use as a template for the assembly

🗩

1:18:25Spec out a find routine in pseudo-C code to use as a template for the assembly

🗩

1:18:25Spec out a find routine in pseudo-C code to use as a template for the assembly

🗩

1:35:26Paste this find routine into our FORTH implementation

1:42:42Run it to find that it assembled

🏃

1:42:42Run it to find that it assembled

🏃

1:42:42Run it to find that it assembled

🏃

1:43:01Try out our find routine

1:45:58Run it and step through the emulation

🏃

1:45:58Run it and step through the emulation

🏃

1:45:58Run it and step through the emulation

🏃

1:47:12Fix temp_str_len to be a constant, not a label

1:47:31Step through our find routine to find garbage in x11

🏃

1:47:31Step through our find routine to find garbage in x11

🏃

1:47:31Step through our find routine to find garbage in x11

🏃

1:49:37Fix find to compare t2 (rather than t3) with t4

1:49:44Step through our find routine

🏃

1:49:44Step through our find routine

🏃

1:49:44Step through our find routine

🏃

1:51:09Fix find to load into t4 using lbu rather than lw

1:51:29Run it to see that x11 contains 3

🏃

1:51:29Run it to see that x11 contains 3

🏃

1:51:29Run it to see that x11 contains 3

🏃

1:53:05Fix the alignment computation in defentry

1:53:56Step through our find routine to find garbage in x14

🏃

1:53:56Step through our find routine to find garbage in x14

🏃

1:53:56Step through our find routine to find garbage in x14

🏃

1:55:27Fix find to load into t7 and t8 using lbu

1:56:33Step through find to find that it found a match

🏃

1:56:33Step through find to find that it found a match

🏃

1:56:33Step through find to find that it found a match

🏃

1:58:39Define _putdigit and _getdigit to provide a pause-point

1:59:55Run it to find that it always prints 4

🏃

1:59:55Run it to find that it always prints 4

🏃

1:59:55Run it to find that it always prints 4

🏃

2:00:16Define a drop word

2:00:56Run it to find that it still prints 4

🏃

2:00:56Run it to find that it still prints 4

🏃

2:00:56Run it to find that it still prints 4

🏃

2:01:14Fix find to push t1 correctly onto the stack

2:01:26Run it to find that it correctly prints 1

🏃

2:01:26Run it to find that it correctly prints 1

🏃

2:01:26Run it to find that it correctly prints 1

🏃

2:01:32Change temp_str to push "@" rather than "!"

2:01:40Run it to find that it seems to work on all our test strings

🏃

2:01:40Run it to find that it seems to work on all our test strings

🏃

2:01:40Run it to find that it seems to work on all our test strings

🏃

2:02:13Enable find to push two strings

2:03:19Run it to determine that it works, with a few words on adapting pseudo-C to assembly

🏃

2:03:19Run it to determine that it works, with a few words on adapting pseudo-C to assembly

🏃

2:03:19Run it to determine that it works, with a few words on adapting pseudo-C to assembly

🏃

2:04:41Glimpse into making a command interpreter and compiler

🗩

2:04:41Glimpse into making a command interpreter and compiler

🗩

2:04:41Glimpse into making a command interpreter and compiler

🗩

2:05:31nodist_io What's ion in your bitwise repo?

🗪

2:05:31nodist_io What's ion in your bitwise repo?

🗪

2:05:31nodist_io What's ion in your bitwise repo?

🗪

2:06:07That was it for today

🗩

2:06:07That was it for today

🗩

2:06:07That was it for today

🗩

Bitwise

Keyboard Navigation

Global Keys

Menu toggling

In-Menu Movement

Quotes and References Menus

Quotes, References and Credits Menus

Filter Menu

Filter and Link Menus

Credits Menu