uxn/projects/software/asma.usm

( devices )

|10 @Console    [ &pad    $8 &char     $1 &byte   $1 &short $2 &string $2 ]
|a0 @File       [ &vector $2 &success  $2 &offset $2 &pad   $2 &name  $2 &length $2 &load $2 &save $2 ]

( vectors )

(
	Asma - an in-Uxn assembler

	This assembler aims to be binary compatible with the output from
	src/assembler.c, but unlike that assembler this one can be run inside Uxn
	itself!

	Asma is designed to be able to be copy-pasted inside another project, so
	all its routines are prefixed with "asma-" to prevent clashes with labels
	used in the incorporating project. The reset vector contains a couple of
	examples of asma's usage and can be discarded.
)

|0100 @reset
	(
		Assemble the source code into an output ROM file.

		If all you want is to use asma.usm to assemble files, insert a BRK
		after this statement.
	)
	;&source-file ;&dest-file ;asma-assemble-file JSR2

	(
		If an error has occurred, BRK here, otherwise continue. (The error
		message will already have been printed to the Console in
		asma-assemble-file.)
	)
	;asma/error LDA2 #0000 EQU2 JMP BRK

	(
		Load the output ROM over the currently running program, almost as if
		we loaded the ROM with uxnemu directly!

		It's not a totally pristine environment, as File/load doesn't zero out
		memory beyond the end of the file. So if the assembled program assumes
		that all memory above it is zero, it may misbehave.

		Asma itself doesn't use the zero page, but this example code writes a
		DEO2 instruction to 0x00ff. In order to execute File/load and have the
		CPU continue at memory location 0x0100, we write the final DEO2
		instruction there and jump there as our final act.

		Just in case the assembled code is zero-length (which can occur when
		assembling an empty source file), we write a BRK to the reset vector so
		that will prevent an infinite loop.
	)
	;&dest-file .File/name DEO2
	#0000 .File/offset DEO2
	#ff00 .File/length DEO2
	#0100 .File/load
	LIT DEO2 #00ff STA
	LIT BRK #0100 STA
	#00ff JMP2

	&source-file
		"projects/demos/piano.usm 00
	&dest-file
		"bin/asma-boot.rom 00

(
	Common macros for use later on.
)

%asma-IF-ERROR { ;asma/error LDA2 ORA }
%asma-LOG { #09 }
(
	asma-LOG is a log-level parameter for helping to debug stuff.
	Its value is the bitwise OR of all the following output types:
		#01 prints the number of lines in the source code,
		#02 prints tokens as they are processed,
		#04 dumps all defined labels at end, and
		#08 prints the heap usage.
)
%asma-DEO2 { asma-LOG AND #00 EQU JMP DEO2k POP POP2 }
%asma-DEO { asma-LOG AND #00 EQU JMP DEOk POP2 }

(
	Asma's public interface.
	These routines are what are expected to be called from programs that bundle
	Asma into bigger projects.
)

@asma-assemble-file ( src-filename* dest-filename* -- )
	;asma/dest-filename STA2 ;asma/src-filename STA2

	;asma-init-first-pass JSR2
	;asma-flush-ignore ;asma/flush-fn STA2
	;asma/src-filename LDA2 ;asma-assemble-file-pass JSR2
	asma-IF-ERROR ,&error JCN

	;asma-init-next-pass JSR2
	;asma-flush-to-file ;asma/flush-fn STA2
	;asma/src-filename LDA2 ;asma-assemble-file-pass JSR2
	asma-IF-ERROR ,&error JCN

	;asma-trees/labels ;asma-print-labels JSR2 ( DEBUG )
	;asma-print-line-count JSR2 ( DEBUG )
	;asma-print-heap-usage JSR2 ( DEBUG )
	JMP2r

	&error
	;asma-print-error JSR2 ( DEBUG )
	JMP2r

(
	Debugging routines. These all output extra information to the Console.
	These can be stripped out to save space, once the references to them are
	removed. Look for the word DEBUG above to find these references: the lines
	that contain that word can be deleted to strip out the functionality
	cleanly.
)

@asma-print-error ( -- )
	;asma/error LDA2 .Console/string DEO2
	#3a .Console/char DEO
	#20 .Console/char DEO
	;asma/orig-token LDA2 .Console/string DEO2
	;&line .Console/string DEO2
	;asma/line LDA2 .Console/short DEO2
	#2e .Console/char DEO
	#0a .Console/char DEO
	BRK

	&line 20 "on 20 "line 20 00

@asma-print-line-count ( -- )
	;asma/line LDA2 .Console/short #01 asma-DEO2
	;&lines .Console/string #01 asma-DEO2
	JMP2r

	&lines [ 20 "lines 20 "of 20 "source 20 "code. 0a 00 ]

@asma-print-heap-usage ( -- )
	;asma/heap LDA2 ;asma-heap SUB2 .Console/short #08 asma-DEO2
	;&str1 .Console/string #08 asma-DEO2
	;asma-heap/end ;asma/heap LDA2 SUB2 .Console/short #08 asma-DEO2
	;&str2 .Console/string #08 asma-DEO2
	JMP2r

	&str1 [ 20 "bytes 20 "of 20 "heap 20 "used, 20 00 ]
	&str2 [ 20 "bytes 20 "free. 0a 00 ]

@asma-print-sublabels ( incoming-ptr* -- )
	LDA2
	ORAk ,&valid-incoming-ptr JCN
	POP2 JMP2r

	&valid-incoming-ptr
	( left node )
	DUP2 ,asma-print-sublabels JSR
	( here )
	#09 .Console/char #04 asma-DEO
	DUP2 #0004 ADD2
	&loop
	DUP2 #0001 ADD2 SWP2 LDA
	DUP #00 EQU ,&end JCN
	.Console/char #04 asma-DEO
	,&loop JMP
	&end
	POP
	#09 .Console/char #04 asma-DEO
	LDA2 .Console/short #04 asma-DEO2
	#0a .Console/char #04 asma-DEO

	( right node )
	#0002 ADD2 ,asma-print-sublabels JSR
	JMP2r

@asma-print-labels ( incoming-ptr* -- )
	LDA2
	ORAk ,&valid-incoming-ptr JCN
	POP2 JMP2r

	&valid-incoming-ptr
	( left node )
	DUP2 ,asma-print-labels JSR
	( here )
	DUP2 #0004 ADD2
	&loop
	DUP2 #0001 ADD2 SWP2 LDA
	DUP #00 EQU ,&end JCN
	.Console/char #04 asma-DEO
	,&loop JMP
	&end
	POP
	#09 .Console/char #04 asma-DEO
	LDA2k .Console/short #04 asma-DEO2
	#0a .Console/char #04 asma-DEO
	( subtree )
	#0002 ADD2 ;asma-print-sublabels JSR2

	( right node )
	#0002 ADD2 ,asma-print-labels JSR
	JMP2r

(
	Initialise the assembler state before loading a file or chunk.
)

@asma-init-first-pass ( -- )
	#ff ;asma/pass STA
	#0000 DUP2k
		;asma/error STA2
		;asma-trees/labels STA2
		;asma-trees/macros STA2
	;asma-heap ;asma/heap STA2
	;asma-opcodes/_entry ;asma-trees/opcodes STA2
	( fall through )

@asma-init-next-pass ( -- )
	;asma/pass LDA #01 ADD ;asma/pass STA
	;asma-write-buffer ;asma-output/ptr STA2
	#0000 DUP2k
		;asma-output/offset STA2
		;asma/addr STA2
		;asma/state STA
	#01 ( 0001 )
	SWPk ( 0001 0100 ) ;asma/written-addr STA2
	;asma/line STA2
	JMP2r

(
	Divide a file up into chunks, and pass each chunk to asma-assemble-chunk.
)

@asma-assemble-file-pass ( filename-ptr* -- )
	#0000

	&loop
	OVR2 .File/name DEO2
	DUP2 .File/offset DEO2
	;asma-read-buffer/end ;asma-read-buffer SUB2 STH2k .File/length DEO2
	;asma-read-buffer DUP2k .File/load DEO2
	.File/success DEI2
	DUP2 STH2r SUB2 ORA ,&last-one JCN
	,asma-assemble-chunk JSR asma-IF-ERROR ,&error JCN
	SUB2 SUB2
	,&loop JMP

	&last-one
	ADD2k #00 ROT ROT STA
	#0001 ADD2
	,asma-assemble-chunk JSR asma-IF-ERROR ,&error JCN

	( flush output buffer )
	;asma-output/ptr LDA2 ;asma-write-buffer SUB2 ;asma/flush-fn LDA2 JSR2

	POP2
	&error
	POP2 POP2 POP2
	JMP2r

(
	Assemble a chunk of source code, which begins with whitespace or the start
	of a token and is divided up into tokens separated by whitespace. If the
	chunk ends with whitespace, assembled-up-to-ptr* will equal ptr* + len* and
	every token in the chunk will have been assembled. If the chunk ends with a
	non-whitespace character, assembled-up-to-ptr* will point to the beginning
	of the last token in the chunk.
)

@asma-assemble-chunk ( ptr* len* -- assembled-up-to-ptr* )
	OVR2 ADD2 #0001 SUB2 SWP2 STH2k
	,&loop JMP

	&next-char-pop
	POP
	&next-char
	#0001 ADD2
	&loop ( last-ptr* ptr* / start-of-token* )
	OVR2 OVR2 LTH2 ,&end JCN
	LDAk ( last-ptr* ptr* char / start-of-token* )
	DUP #20 GTH ,&next-char-pop JCN

	#00 OVR2 ( last-ptr* ptr* char 00 ptr* / start-of-token* )
	STA
	STH2r ,asma-assemble-token JSR asma-IF-ERROR ,&error JCN

	#0a NEQ ,&not-newline JCN
	;asma/line LDA2 #0001 ADD2 ;asma/line STA2
	&not-newline

	DUP2 #0001 ADD2 STH2 ,&next-char JMP

	&end
	POP2 POP2 STH2r
	JMP2r

	&error
	POP POP2 POP2
	JMP2r

@asma [ &pass $1 &state $1 &line $2 &token $2 &orig-token $2 &heap $2 &addr $2 &written-addr $2 &flush-fn $2 &src-filename $2 &dest-filename $2 &error $2 ]
@asma-trees [ &labels $2 &macros $2 &opcodes $2 &scope $2 ]

(
	The main routine to assemble a single token.
	asma/state contains several meaningful bits:
	0x02 we are in a comment,
	0x04 we are in a macro body, and
	0x08 we are in a macro body that we are ignoring
	   (because the macro was already defined in a previous pass).
	Since 0x08 never appears without 0x04, the lowest bit set in asma/state is
	always 0x00, 0x02, or 0x04, which is very handy for use with jump tables.
	The lowest bit set can be found easily by #00 (n) SUBk AND.
)

@asma-assemble-token ( string-ptr* -- )
	DUP2 .Console/string #02 asma-DEO2
	#0a .Console/char #02 asma-DEO
	DUP2 ;asma/token STA2
	DUP2 ;asma/orig-token STA2
	LDAk ,&not-empty JCN
	POP2
	JMP2r

	&not-empty ( token* / )
	( truncate to one char long )
	#0001 ADD2 ( end* / )
	STH2k LDAkr ( end* / end* char )
	STH2k ( end* / end* char end* )
	LITr 00 STH2 ( / end* char end* 00 end* )
	STAr ( / end* char end* )

	#00 ;asma/state LDA SUBk AND ( tree-offset* / end* )
	DUP2 ;&first-char-trees ADD2 ( tree-offset* incoming-ptr* / end* )
	;asma-traverse-tree JSR2

	( restore truncated char )
	STAr

	,&not-found JCN

	( tree-offset* token-routine-ptr* / end* )
	STH2r ;asma/token STA2
	SWP2 POP2 LDA2
	JMP2 ( tail call )

	&not-found ( tree-offset* dummy* / end* )
	POP2 POP2r
	;&body-routines ADD2 LDA2
	JMP2 ( tail call )

	&first-char-trees
		:asma-first-char-normal/_entry
		:asma-first-char-comment/_entry
		:asma-first-char-macro/_entry

	&body-routines
		:asma-normal-body
		:asma-ignore
		:asma-macro-body

@asma-parse-hex-digit ( charcode -- 00-0f if valid hex
                                 OR 10-ff otherwise )
	DUP #3a LTH ,&digit JCN
	DUP #60 GTH ,&letter JCN
	JMP2r

	&digit
	#30 SUB
	JMP2r

	&letter
	#57 SUB
	JMP2r

@asma-parse-hex-string ( -- value* 06 if valid hex and length > 2
                         OR value* 03 if valid hex and length <= 2
                         OR 00 otherwise )
	;asma/token LDA2 DUP2 ,asma-strlen JSR #02 GTH ROT ROT
	LIT2r 0000

	&loop
	LDAk
	DUP ,&not-end JCN
	POP POP2
	STH2r ROT #01 ADD #03 MUL
	JMP2r

	&not-end
	,asma-parse-hex-digit JSR
	DUP #f0 AND ,&fail JCN
	LIT2r 0010 MUL2r
	#00 STH STH ADD2r
	#0001 ADD2
	,&loop JMP

	&fail
	POP POP2 POP2r
	DUP EOR
	JMP2r

@asma-strlen ( string-ptr* -- length )
	LITr 00

	&loop
	LDAk
	,&not-end JCN
	POP2 STHr
	JMP2r

	&not-end
	LITr 01 ADDr
	#0001 ADD2
	,&loop JMP

%asma-SHORT-FLAG { #20 }
%asma-RETURN-FLAG { #40 }
%asma-KEEP-FLAG { #80 }

@asma-parse-opcode ( -- byte 00 if valid opcode
                     OR 01 otherwise )
	;asma/token LDA2
	DUP2 ,asma-strlen JSR #03 LTH ,&too-short JCN

	( truncate to three chars long )
	#0003 ADD2 ( end* / )
	STH2k LDAkr ( end* / end* char )
	STH2k ( end* / end* char end* )
	LITr 00 STH2 ( / end* char end* 00 end* )
	STAr ( / end* char end* )

	;asma-trees/opcodes ;asma-traverse-tree JSR2
	STAr
	,&not-found JCN

	;asma-opcodes/_disasm SUB2 #0003 SFT2 ( 00 byte / end* )
	&loop
	LDAkr STHr LIT2r 0001 ADD2r ( 00 byte char / end* )
	DUP ,&not-end JCN
	POP POP2r
	SWP
	JMP2r

	&not-end
	DUP LIT '2 NEQ ,&not-two JCN
	POP asma-SHORT-FLAG ORA ,&loop JMP

	&not-two
	DUP LIT 'r NEQ ,&not-return JCN
	POP asma-RETURN-FLAG ORA ,&loop JMP

	&not-return
	LIT 'k NEQ ,&not-keep JCN
	asma-KEEP-FLAG ORA ,&loop JMP

	&not-keep ( 00 byte / end* )
	&not-found ( incoming-ptr* / end* )
	POP2r
	&too-short ( token* / )
	POP2 #01
	JMP2r

@asma-write-short ( short -- )
	SWP
	,asma-write-byte JSR
	,asma-write-byte JMP ( tail call )

@asma-write-byte ( byte -- )
	;asma/addr LDA2 ;asma/written-addr LDA2
	LTH2k ,&rewound JCN
	&loop
	EQU2k ,&ready JCN
	#00 ,&write JSR
	#0001 ADD2
	,&loop JMP

	&rewound
	;asma-msg-rewound ;asma/error STA2
	POP2 POP2 POP JMP2r

	&ready
	POP2 #0001 ADD2
	DUP2 ;asma/addr STA2
	;asma/written-addr STA2

	&write
	,asma-output/ptr LDR2
	DUP2 ;asma-write-buffer/end EQU2 ,&flush JCN
	&after-flush
	STH2k STA
	STH2r #0001 ADD2 ,asma-output/ptr STR2

	( #3e .Console/char ;asma/pass LDA asma-DEO
	#20 .Console/char ;asma/pass LDA asma-DEO
	#00 .Console/byte ;asma/pass LDA asma-DEO
	#0a .Console/char ;asma/pass LDA asma-DEO )
	JMP2r

	&flush ( ptr* -- start-of-buffer* )
	;asma-write-buffer SUB2k ( ptr* start* len* )
	;asma/flush-fn LDA2 JSR2
	SWP2 POP2 ( start* )
	,&after-flush JMP

@asma-output [ &ptr $2 &offset $2 &filename $2 ]

@asma-flush-ignore ( len* -- )
	POP2
	JMP2r

@asma-flush-to-file ( len* -- )
	DUP2 .File/length DEO2
	,asma-output/offset LDR2 DUP2 .File/offset DEO2 ADD2 ,asma-output/offset STR2
	;asma/dest-filename LDA2 .File/name DEO2
	;asma-write-buffer .File/save DEO2
	JMP2r

@asma-append-heap-byte ( dummy byte -- dummy )
	;asma/heap LDA2
	OVR2 OVR2 STA POP
	#0001 ADD2 ;asma/heap STA2
	POP
	JMP2r

@asma-append-heap-short ( dummy short* -- dummy )
	SWP
	,asma-append-heap-byte JSR
	,asma-append-heap-byte JMP ( tail call )

@asma-append-heap-string ( string* -- )
	LDAk
	DUP ,asma-append-heap-byte JSR
	,&keep-going JCN
	POP2 JMP2r

	&keep-going
	#0001 ADD2
	,asma-append-heap-string JMP

@asma-traverse-tree ( incoming-ptr* -- binary-ptr* 00 if key found
                                    OR node-incoming-ptr* 01 if key not found )
	&loop ( incoming-ptr* )
	LDA2k ORA ,&valid-node JCN
	#01 JMP2r

	&valid-node
	LDA2 STH2k
	#0004 ADD2 ,asma-strcmp-tree JSR
	DUP ,&nomatch JCN
	POP2r JMP2r

	&nomatch
	#06 SFT #02 AND #00 SWP
	STH2r ADD2
	,&loop JMP

	( &help-str "Looking 20 "up 20 00 )

@asma-strcmp-tree ( node-key* -- order if strings differ
                              OR after-node-key* 00 if strings match )
	;asma/token LDA2 STH2

	&loop ( node-key* / token* )
	DUP2 #0001 ADD2 SWP2 LDA LDAkr STHr
	ORAk ,&not-end JCN

	( end of C strings, match found )
	POP2r POP
	JMP2r

	&not-end
	SUB
	DUP ,&nomatch JCN
	POP
	LIT2r 0001 ADD2r
	,&loop JMP

	&nomatch
	POP2r ROT ROT POP2
	JMP2r

(
	First character routines.
	The following routines (that don't have a FORTH-like signature) are called
	to deal with tokens that begin with particular first letters, or (for
	-body routines) tokens that fail to match any first letter in their tree.
)

%asma-STATE-SET { ;asma/state LDA ORA ;asma/state STA }
%asma-STATE-CLEAR { #ff EOR ;asma/state LDA AND ;asma/state STA }

@asma-comment-start
	#02 asma-STATE-SET
@asma-ignore
	JMP2r

@asma-comment-end
	#02 asma-STATE-CLEAR
	JMP2r

@asma-macro-define
	;asma/pass LDA ,&ignore-macro JCN

	;asma-trees/macros ;asma-traverse-tree JSR2 ,&not-exist JCN
	POP2
	;asma-msg-macro ;asma/error STA2
	JMP2r

	&not-exist
	( define macro by creating new node )
	;asma/heap LDA2 SWP2 STA2
	#0000 ;asma-append-heap-short JSR2 ( less-than pointer )
	#0000 ;asma-append-heap-short JSR2 ( greater-than pointer )
	;asma/token LDA2 ;asma-append-heap-string JSR2 ( key )
	#04 asma-STATE-SET
	JMP2r

	&ignore-macro
	#0c asma-STATE-SET
	JMP2r

@asma-macro-body
	;asma/state LDA #08 AND ,&skip JCN
	;asma/token LDA2 ;asma-append-heap-string JSR2
	&skip
	JMP2r

@asma-macro-end
	#00 ;asma-append-heap-byte JSR2
	#0c asma-STATE-CLEAR
	JMP2r

@asma-label-define
	;asma-trees/labels ,asma-label-helper JSR
	,&already-existed JCN

	#0000 ;asma-append-heap-short JSR2 ( data2: subtree incoming ptr )

	&already-existed
	#0002 ADD2 ;asma-trees/scope STA2
	JMP2r

@asma-sublabel-define
	;asma-trees/scope LDA2 ,asma-label-helper JSR
	POP POP2
	JMP2r

@asma-label-helper ( incoming-ptr* -- binary-ptr* 00 if label existed already
                                   OR binary-ptr* 01 if label was created )
	;asma-traverse-tree JSR2
	,&new-label JCN

	( label already exists )
	( FIXME check label address hasn't changed (label defined twice) )
	#01 JMP2r

	&new-label ( incoming-ptr* )
	( define label by creating new node )
	;asma/heap LDA2 SWP2 STA2
	#0000 ;asma-append-heap-short JSR2 ( less-than pointer )
	#0000 ;asma-append-heap-short JSR2 ( greater-than pointer )
	;asma/token LDA2 ;asma-append-heap-string JSR2 ( key )

	;asma/heap LDA2

	;asma/addr LDA2 ;asma-append-heap-short JSR2 ( data1: address )
	#00 JMP2r

@asma-pad-absolute
	#0000 ,asma-pad-helper JMP

@asma-pad-relative
	;asma/addr LDA2
	( fall through )

@asma-pad-helper ( offset* -- )
	;asma-parse-hex-string JSR2
	,&valid JCN

	;asma-msg-hex ;asma/error STA2
	JMP2r

	&valid
	ADD2 ;asma/addr STA2
	JMP2r

@asma-raw-char
	;asma/token LDA2 LDA
	;asma-write-byte JMP2 ( tail call )

@asma-raw-word
	;asma/token LDA2

	&loop
	LDAk
	DUP ,&not-end JCN

	POP POP2
	JMP2r

	&not-end
	;asma-write-byte JSR2
	#0001 ADD2
	,&loop JMP

@asma-literal-abs-addr
	LIT LIT2 ;asma-write-byte JSR2
	( fall through )

@asma-abs-addr
	,asma-addr-helper JSR
	;asma-write-short JMP2 ( tail call )

@asma-literal-zero-addr
	LIT LIT ;asma-write-byte JSR2
	,asma-addr-helper JSR
	;asma-write-byte JSR2

	,&not-zero-page JCN
	JMP2r

	&not-zero-page
	;asma-msg-zero-page ;asma/error STA2
	JMP2r

@asma-literal-rel-addr
	LIT LIT ;asma-write-byte JSR2
	,asma-addr-helper JSR ;asma/addr LDA2 SUB2 #0002 SUB2

	DUP2 #0080 LTH2 STH
	DUP2 #ff7f GTH2 STHr ORA ,&in-bounds JCN

	POP2
	;asma-msg-relative ;asma/error STA2
	JMP2r

	&in-bounds
	;asma-write-byte JSR2
	POP
	JMP2r

@asma-addr-helper ( -- addr* )
	;asma/token LDA2 LDAk #26 NEQ ,&not-local JCN
	#0001 ADD2 ;asma/token STA2
	;asma-trees/scope LDA2
	,&final-lookup JMP

	&not-local ( token* )
	LDAk
	DUP ,&not-end JCN
	POP POP2
	;asma-trees/labels
	,&final-lookup JMP

	&not-end ( token* char )
	#2f EQU ,&found-slash JCN
	#0001 ADD2
	,&not-local JMP

	&found-slash ( token* )
	DUP2 #00 ROT ROT STA
	;asma-trees/labels ;asma-traverse-tree JSR2 STH
	SWP2 DUP2 #2f ROT ROT STA
	STHr ,&not-found2 JCN
	( token* binary-ptr* )
	#0001 ADD2 ;asma/token STA2
	#0002 ADD2

	&final-lookup ( addr-offset* incoming-ptr* )
	;asma-traverse-tree JSR2
	,&not-found JCN
	LDA2
	JMP2r

	&not-found2 ( dummy* dummy* )
	POP2
	&not-found ( dummy* )
	POP2

	;asma/pass LDA #00 EQU ,&ignore-error JCN
	;asma-msg-label ;asma/error STA2
	&ignore-error

	;asma/addr LDA2
	JMP2r

@asma-literal-hex
	;asma-parse-hex-string JSR2 JMP
	( hex invalid ) ,&invalid JMP
	( hex byte    ) ,asma-byte-helper JMP
	( hex short   ) ,asma-short-helper JMP

	&invalid
	POP2

	;asma-msg-hex ;asma/error STA2
	JMP2r

@asma-byte-helper ( dummy value -- )
	LIT LIT ;asma-write-byte JSR2
	&raw
	;asma-write-byte JSR2
	POP
	JMP2r

@asma-short-helper ( value* -- )
	LIT LIT2 ;asma-write-byte JSR2
	&raw
	;asma-write-short JMP2 ( tail call )

@asma-normal-body
	;asma-parse-opcode JSR2 ,&not-opcode JCN
	;asma-write-byte JMP2 ( tail call )

	&not-opcode
	;asma-parse-hex-string JSR2 JMP
	( hex invalid ) ,&not-hex JMP
	( hex byte    ) ,asma-byte-helper/raw JMP
	( hex short   ) ,asma-short-helper/raw JMP

	&not-hex
	;asma-trees/macros ;asma-traverse-tree JSR2 ,&not-macro JCN

	&macro-loop
	LDAk ,&keep-going JCN
	&error
	POP2
	JMP2r

	&keep-going
	DUP2k ;asma-strlen JSR2 #00 SWP #0001 ADD2 ADD2
	SWP2 ;asma-assemble-token JSR2 asma-IF-ERROR ,&error JCN
	,&macro-loop JMP

	&not-macro
	POP2

	;asma-msg-label ;asma/error STA2
	JMP2r

( Error messages )

@asma-msg-hex       "Invalid 20 "hexadecimal 00
@asma-msg-zero-page "Address 20 "not 20 "in 20 "zero 20 "page 00
@asma-msg-relative  "Address 20 "outside 20 "range 00
@asma-msg-label     "Label 20 "not 20 "found 00
@asma-msg-macro     "Macro 20 "already 20 "exists 00
@asma-msg-rewound   "Memory 20 "overwrite 00

( trees )

( --- 8< ------- 8< --- cut here --- 8< ------- 8< --- )
(          automatically generated code below          )
(          see etc/asma.moon for instructions          )

(	label       less       greater      key            binary
	            than       than         string         data )

@asma-first-char-comment
	&_entry      $2         $2          ') 00          :asma-comment-end

@asma-first-char-macro
	&28          $2         $2          '( 00          :asma-comment-start
	&29         :&28        $2          ') 00          :asma-comment-end
	&_entry     :&29       :&7d         '{ 00          :asma-ignore
	&7d          $2         $2          '} 00          :asma-macro-end

@asma-first-char-normal
	&22          $2         $2          '" 00          :asma-raw-word
	&23         :&22        $2          '# 00          :asma-literal-hex
	&24         :&23       :&25         '$ 00          :asma-pad-relative
	&25          $2         $2          '% 00          :asma-macro-define
	&26         :&24       :&29         26 00 ( & )    :asma-sublabel-define
	&27          $2         $2          '' 00          :asma-raw-char
	&28         :&27        $2          '( 00          :asma-comment-start
	&29         :&28       :&2c         ') 00          :asma-comment-end
	&2c          $2         $2          ', 00          :asma-literal-rel-addr
	&_entry     :&26       :&5d         '. 00          :asma-literal-zero-addr
	&3a          $2         $2          ': 00          :asma-abs-addr
	&3b         :&3a        $2          '; 00          :asma-literal-abs-addr
	&40         :&3b       :&5b         '@ 00          :asma-label-define
	&5b          $2         $2          '[ 00          :asma-ignore
	&5d         :&40       :&7c         '] 00          :asma-ignore
	&7b          $2         $2          '{ 00          :asma-ignore
	&7c         :&7b       :&7d         '| 00          :asma-pad-absolute
	&7d          $2         $2          '} 00          :asma-ignore

@asma-opcodes
	&BRK        :&AND      :&DEI &_disasm "BRK 00
	&_entry     :&EQU      :&ROT        "LIT 00
	&NOP        :&MUL      :&OVR        "NOP 00
	&POP         $2         $2          "POP 00
	&DUP        :&DIV      :&EOR        "DUP 00
	&SWP         $2         $2          "SWP 00
	&OVR        :&ORA      :&POP        "OVR 00
	&ROT        :&NOP      :&STR        "ROT 00
	&EQU        :&DEO      :&JSR        "EQU 00
	&NEQ         $2         $2          "NEQ 00
	&GTH         $2         $2          "GTH 00
	&LTH         $2         $2          "LTH 00
	&JMP         $2         $2          "JMP 00
	&JCN        :&GTH      :&JMP        "JCN 00
	&JSR        :&JCN      :&LDR        "JSR 00
	&STH         $2         $2          "STH 00
	&LDZ         $2         $2          "LDZ 00
	&STZ         $2         $2          "STZ 00
	&LDR        :&LDA      :&LDZ        "LDR 00
	&STR        :&STA      :&SUB        "STR 00
	&LDA         $2         $2          "LDA 00
	&STA        :&SFT      :&STH        "STA 00
	&DEI         $2         $2          "DEI 00
	&DEO        :&BRK      :&DUP        "DEO 00
	&ADD         $2         $2          "ADD 00
	&SUB        :&STZ      :&SWP        "SUB 00
	&MUL        :&LTH      :&NEQ        "MUL 00
	&DIV         $2         $2          "DIV 00
	&AND        :&ADD       $2          "AND 00
	&ORA         $2         $2          "ORA 00
	&EOR         $2         $2          "EOR 00
	&SFT         $2         $2          "SFT 00

(
	Heap, a large temporary area for keeping track of labels. More complex
	programs need more of this space. If there's insufficient space then the
	assembly process will fail, but having extra space above what the most
	complex program needs provides no benefit.

	This heap, and the buffers below, are free to be used to hold temporary
	data between assembly runs, and do not need to be initialized with any
	particular contents to use the assembler.
)

@asma-heap

|e000 &end

(
	Buffer for use with loading source code.
	The minimum size is the length of the longest token plus one, which is
	0x21 to keep the same capability of the C assembler.
	Larger sizes are more efficient, provided there is enough
	heap space to keep track of all the labels.
)

@asma-read-buffer

|f800 &end

(
	Buffer for use with writing output.
	The minimum size is 1, and larger sizes are more efficient.
)

@asma-write-buffer

|ffff &end