Assembler Macro Expansion
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0:07Recap and set the stage for the day
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0:07Recap and set the stage for the day
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0:07Recap and set the stage for the day
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1:05Review the new cmd_la() pseudo-instruction
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1:05Review the new cmd_la() pseudo-instruction
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1:05Review the new cmd_la() pseudo-instruction
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4:03Review the new two-operand syntax for three-operand instructions
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4:03Review the new two-operand syntax for three-operand instructions
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4:03Review the new two-operand syntax for three-operand instructions
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5:48Review the new partial inference of immediates from operands
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5:48Review the new partial inference of immediates from operands
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5:48Review the new partial inference of immediates from operands
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7:52Review the new support for '.' being the first character of an identifier
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7:52Review the new support for '.' being the first character of an identifier
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7:52Review the new support for '.' being the first character of an identifier
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9:35Review the new '>' and '<' jump-to-label directives, inspired by the NES Metroid source1
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9:35Review the new '>' and '<' jump-to-label directives, inspired by the NES Metroid source1
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9:35Review the new '>' and '<' jump-to-label directives, inspired by the NES Metroid source1
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15:38Describe the implementation of anonymous labels
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15:38Describe the implementation of anonymous labels
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15:38Describe the implementation of anonymous labels
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19:43Review the load immediate and mov pseudo-instructions
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19:43Review the load immediate and mov pseudo-instructions
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19:43Review the load immediate and mov pseudo-instructions
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21:53Q&A
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21:53Q&A
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21:53Q&A
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22:03 Shouldn't 1545 be "lw x3, [val]"?
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22:03 Shouldn't 1545 be "lw x3, [val]"?
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22:03 Shouldn't 1545 be "lw x3, [val]"?
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23:06 I like all your changes personally, the only thing I would do different is dropping number labels and using the <# ># syntax for referring to anonymous labels. But it's all bikeshed discussion really
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23:06 I like all your changes personally, the only thing I would do different is dropping number labels and using the <# ># syntax for referring to anonymous labels. But it's all bikeshed discussion really
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23:06 I like all your changes personally, the only thing I would do different is dropping number labels and using the <# ># syntax for referring to anonymous labels. But it's all bikeshed discussion really
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26:35Macro Expansion
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26:35Macro Expansion
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26:35Macro Expansion
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28:07Macros, Constant and Parameterized
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28:07Macros, Constant and Parameterized
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28:07Macros, Constant and Parameterized
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30:30Spec'ing out our macros syntax, and considering how to implement it
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30:30Spec'ing out our macros syntax, and considering how to implement it
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30:30Spec'ing out our macros syntax, and considering how to implement it
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32:50Dive right in to implementing macro expansion, separating out next_token() into a new scan_token() function
32:50Dive right in to implementing macro expansion, separating out next_token() into a new scan_token() function
32:50Dive right in to implementing macro expansion, separating out next_token() into a new scan_token() function
43:07Run it to see that it does not work
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43:07Run it to see that it does not work
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43:07Run it to see that it does not work
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43:19Fix next_token() to use the returned token from scan_token()
43:19Fix next_token() to use the returned token from scan_token()
43:19Fix next_token() to use the returned token from scan_token()
43:25Run it to see that it works
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43:25Run it to see that it works
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43:25Run it to see that it works
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43:58Introduce the notion of a TokenList, and init_scan() to build up that list
43:58Introduce the notion of a TokenList, and init_scan() to build up that list
43:58Introduce the notion of a TokenList, and init_scan() to build up that list
51:24Run it to see that it miraculously works
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51:24Run it to see that it miraculously works
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51:24Run it to see that it miraculously works
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51:48Stress test the error handling
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51:48Stress test the error handling
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51:48Stress test the error handling
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54:08Augment the TokenList with an index
54:08Augment the TokenList with an index
54:08Augment the TokenList with an index
58:03Run it to see that it's okay
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58:03Run it to see that it's okay
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58:03Run it to see that it's okay
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58:27Introduce the notion of a TokenListStack and its accompanying push_token_list() and pop_token_list() to handle "nested macro" expansion
58:27Introduce the notion of a TokenListStack and its accompanying push_token_list() and pop_token_list() to handle "nested macro" expansion
58:27Introduce the notion of a TokenListStack and its accompanying push_token_list() and pop_token_list() to handle "nested macro" expansion
1:07:54Run it to see that it seems to work
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1:07:54Run it to see that it seems to work
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1:07:54Run it to see that it seems to work
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1:08:13Embark on the actual macro expansion, introducing cmd_define()
1:08:13Embark on the actual macro expansion, introducing cmd_define()
1:08:13Embark on the actual macro expansion, introducing cmd_define()
1:16:36Run it with the macro established in the symbol table
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1:16:36Run it with the macro established in the symbol table
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1:16:36Run it with the macro established in the symbol table
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1:16:40Enable next_token() to perform macro expansion
1:16:40Enable next_token() to perform macro expansion
1:16:40Enable next_token() to perform macro expansion
1:18:51The logic of the macro expansion
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1:18:51The logic of the macro expansion
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1:18:51The logic of the macro expansion
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1:19:37Fix next_token() to check that it even got a sym before checking that it is a SYM_MACRO
1:19:37Fix next_token() to check that it even got a sym before checking that it is a SYM_MACRO
1:19:37Fix next_token() to check that it even got a sym before checking that it is a SYM_MACRO
1:20:11Run it and unexpectedly hit an "Expected name, got integer" error
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1:20:11Run it and unexpectedly hit an "Expected name, got integer" error
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1:20:11Run it and unexpectedly hit an "Expected name, got integer" error
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1:21:55Separate some of next_token() out into next_unexpanded_token(), and (temporarily?) require the use of '' to denote the identifier in macros
1:21:55Separate some of next_token() out into next_unexpanded_token(), and (temporarily?) require the use of '' to denote the identifier in macros
1:21:55Separate some of next_token() out into next_unexpanded_token(), and (temporarily?) require the use of '' to denote the identifier in macros
1:28:18Run it to see that it works
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1:28:18Run it to see that it works
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1:28:18Run it to see that it works
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1:29:32Test '' quoting
1:29:32Test '' quoting
1:29:32Test '' quoting
1:29:49Run it to see that it doesn't work, and break into next_token() to investigate why
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1:29:49Run it to see that it doesn't work, and break into next_token() to investigate why
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1:29:49Run it to see that it doesn't work, and break into next_token() to investigate why
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1:34:10Temporarily make gen_sync_pos() return without doing anything, in an effort to figure out what's wrong
1:34:10Temporarily make gen_sync_pos() return without doing anything, in an effort to figure out what's wrong
1:34:10Temporarily make gen_sync_pos() return without doing anything, in an effort to figure out what's wrong
1:35:13Make next_token() try and set the sym using get_sym() before checking that it successfully got a sym
1:35:13Make next_token() try and set the sym using get_sym() before checking that it successfully got a sym
1:35:13Make next_token() try and set the sym using get_sym() before checking that it successfully got a sym
1:37:23Narrow down our test cases in asm_test()
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1:37:23Narrow down our test cases in asm_test()
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1:37:23Narrow down our test cases in asm_test()
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1:39:29Fix scan_str() to skip the ''
1:39:29Fix scan_str() to skip the ''
1:39:29Fix scan_str() to skip the ''
1:40:07Run it to see that it works
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1:40:07Run it to see that it works
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1:40:07Run it to see that it works
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1:40:25Test macro expansion in asm_test()
1:40:25Test macro expansion in asm_test()
1:40:25Test macro expansion in asm_test()
1:40:41Run it doing macro expansion, and hit our assertion in pop_token_list()
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1:40:41Run it doing macro expansion, and hit our assertion in pop_token_list()
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1:40:41Run it doing macro expansion, and hit our assertion in pop_token_list()
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1:41:52Make init_pass() and lex_test() call init_scan()
1:41:52Make init_pass() and lex_test() call init_scan()
1:41:52Make init_pass() and lex_test() call init_scan()
1:42:48Step through push_token_list() to see that it all works
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1:42:48Step through push_token_list() to see that it all works
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1:42:48Step through push_token_list() to see that it all works
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1:43:46Add a more complex macro expansion test to asm_test()
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1:43:46Add a more complex macro expansion test to asm_test()
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1:43:46Add a more complex macro expansion test to asm_test()
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1:44:47Run it and again hit our assertion in pop_token_list()
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1:44:47Run it and again hit our assertion in pop_token_list()
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1:44:47Run it and again hit our assertion in pop_token_list()
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1:46:30Try renaming that test macro from x4_plus_4 to asdf
1:46:30Try renaming that test macro from x4_plus_4 to asdf
1:46:30Try renaming that test macro from x4_plus_4 to asdf
1:46:43Run it and hit our assertion in pop_token_list()
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1:46:43Run it and hit our assertion in pop_token_list()
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1:46:43Run it and hit our assertion in pop_token_list()
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1:47:51Fix our asdf macro to asdf in asm_test()
1:47:51Fix our asdf macro to asdf in asm_test()
1:47:51Fix our asdf macro to asdf in asm_test()
1:47:58Run it and hit our pop_token_list() assertion on the GETCHAR macro
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1:47:58Run it and hit our pop_token_list() assertion on the GETCHAR macro
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1:47:58Run it and hit our pop_token_list() assertion on the GETCHAR macro
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1:48:29Narrow down our test cases in asm_test()
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1:48:29Narrow down our test cases in asm_test()
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1:48:29Narrow down our test cases in asm_test()
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1:48:50Run it to see that it actually works
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1:48:50Run it to see that it actually works
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1:48:50Run it to see that it actually works
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1:49:09Rename that asdf macro back to x1_plus_4
1:49:09Rename that asdf macro back to x1_plus_4
1:49:09Rename that asdf macro back to x1_plus_4
1:49:28Run it to find that this works
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1:49:28Run it to find that this works
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1:49:28Run it to find that this works
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1:49:42Uncomment the GETCHAR macro definition in asm_test()
1:49:42Uncomment the GETCHAR macro definition in asm_test()
1:49:42Uncomment the GETCHAR macro definition in asm_test()
1:49:56Run it and hit our pop_token_list() assertion on that GETCHAR definition
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1:49:56Run it and hit our pop_token_list() assertion on that GETCHAR definition
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1:49:56Run it and hit our pop_token_list() assertion on that GETCHAR definition
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1:50:38Try flipping the order of the x1_plus_4 and GETCHAR macros
1:50:38Try flipping the order of the x1_plus_4 and GETCHAR macros
1:50:38Try flipping the order of the x1_plus_4 and GETCHAR macros
1:51:00Run it, hit our pop_token_list() assertion and consider that it's the second macro definition that asserts
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1:51:00Run it, hit our pop_token_list() assertion and consider that it's the second macro definition that asserts
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1:51:00Run it, hit our pop_token_list() assertion and consider that it's the second macro definition that asserts
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1:52:17Make init_scan() 0-initialise the token_list_stack and rename next_unexpanded_token() to next_raw_token()
1:52:17Make init_scan() 0-initialise the token_list_stack and rename next_unexpanded_token() to next_raw_token()
1:52:17Make init_scan() 0-initialise the token_list_stack and rename next_unexpanded_token() to next_raw_token()
1:59:32Undo the buggy asm_test()
1:59:32Undo the buggy asm_test()
1:59:32Undo the buggy asm_test()
1:59:56Run it to see that it's fine
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1:59:56Run it to see that it's fine
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1:59:56Run it to see that it's fine
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2:00:21Reflect on our macro expansion with a glimpse into the future of parameterized macros and the determination to fix the bug off-stream
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2:00:21Reflect on our macro expansion with a glimpse into the future of parameterized macros and the determination to fix the bug off-stream
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2:00:21Reflect on our macro expansion with a glimpse into the future of parameterized macros and the determination to fix the bug off-stream
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2:03:36That's it for today's stream
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2:03:36That's it for today's stream
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2:03:36That's it for today's stream
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