application/octet-stream
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214 lines
; Contains the bytecode assembler, so we don't have to write opcodes directly
[defun val->bytecode-op [v]
[def i [val->index v]]
[list [int->bytecode-op [logand [>> i 16] #xFF]]
[int->bytecode-op [logand [>> i 8] #xFF]]
[int->bytecode-op [logand i #xFF]]]]
[defun sym->bytecode-op [v]
[def i [sym->index v]]
[list [int->bytecode-op [logand [>> i 16] #xFF]]
[int->bytecode-op [logand [>> i 8] #xFF]]
[int->bytecode-op [logand i #xFF]]]]
[defun int-fit-in-byte? [a]
[and [<= a 127] [>= a -128]]]
[defun $nop []
"- | Do nothing"
'[#$0]]
[defun $ret []
"a - | Return top of value stack"
'[#$1]]
[defun $push/int/byte [a]
"- a | Return top of value stack"
[when-not [int-fit-in-byte? a]
[throw [list :invalid-bc-op "$push/int/byte can only push a signed 8-bit value" a [current-lambda]]]]
[list #$2 [int->bytecode-op a]]]
[defun $push/int [a]
"- a | Return top of value stack"
[if [int-fit-in-byte? a]
[$push/int/byte a]
[$push/lval a]]]
[defun $add/int []
"a b - c | Adds the two topmost values and pushes the result"
'[#$3]]
[defun $debug/print-stack []
"- | Print out the stack for the current closure"
'[#$4]]
[defun $push/lval [v]
"- v | Pushes v onto the stack"
[list #$5 [val->bytecode-op v]]]
[defun $make-list [item-count]
"items ... - list | Makes a list of item-count items from the stack and pushes the resulting list"
[list #$6 [int->bytecode-op item-count]]]
[defun $eval [a]
"form - | Evaluates the form from the top of the stack"
'[#$7]]
[defun $apply [arg-count fun]
"arguments ... - result | Read arg-count arguments from the stack, apply the to fun and push the result on the stack"
[case arg-count 2
[2 [case fun
[add/int [$add/int]]
[< [$<]]
[<= [$<=]]
[== [$==]]
[>= [$>=]]
[> [$>]]
[otherwise [list #$8
[int->bytecode-op arg-count]
[val->bytecode-op fun]]]]]
[otherwise [list #$8
[int->bytecode-op arg-count]
[val->bytecode-op fun]]]]]
[defun $apply/dynamic [arg-count fun]
[list #$1A [int->bytecode-op arg-count]]]
[defun $call [target]
" - | Call a bytecode subroutine"
[list #$17 [list :relocate target 8 0 [int->bytecode-op 0]]
[list :relocate target 0 1 [int->bytecode-op 0]]]]
[defun $try [target]
" - | Try something, jumping to target if an exception occurs"
[list #$18 [list :relocate target 8 0 [int->bytecode-op 0]]
[list :relocate target 0 1 [int->bytecode-op 0]]]]
[defun $throw []
" - | Return to the closest exception handler"
[list #$19]]
[defun $jmp [target]
[list #$9 [list :relocate target 8 0 [int->bytecode-op 0]]
[list :relocate target 0 1 [int->bytecode-op 0]]]]
[defun $jt [target]
[list #$A [list :relocate target 8 0 [int->bytecode-op 0]]
[list :relocate target 0 1 [int->bytecode-op 0]]]]
[defun $jf [target]
[list #$B [list :relocate target 8 0 [int->bytecode-op 0]]
[list :relocate target 0 1 [int->bytecode-op 0]]]]
[defun $dup []
'[#$C]]
[defun $drop []
'[#$D]]
[defun $def [v]
[list #$E [sym->bytecode-op v]]]
[defun $set [v]
[list #$F [sym->bytecode-op v]]]
[defun $get [v]
[list #$10 [sym->bytecode-op v]]]
[defun $lambda [name args docs body]
[list #$11
[val->bytecode-op name]
[val->bytecode-op args]
[val->bytecode-op docs]
[val->bytecode-op body]]]
[defun $macro [name args docs body]
[list #$12
[val->bytecode-op name]
[val->bytecode-op args]
[val->bytecode-op docs]
[val->bytecode-op body]]]
[defun $closure/push []
'[#$13]]
[defun $closure/enter []
'[#$14]]
[defun $let []
'[#$15]]
[defun $closure/pop []
'[#$16]]
[defun $roots/push []
'[#$1B]]
[defun $roots/pop []
'[#$1C]]
[defun $roots/peek []
'[#$1D]]
[defun $< []
'[#$1E]]
[defun $<= []
'[#$1F]]
[defun $== []
'[#$20]]
[defun $>= []
'[#$21]]
[defun $> []
'[#$22]]
[defun assemble/build-sym-map [code sym-map pos]
[while code
[case [type-of [car code]]
[:bytecode-op [tree/set! sym-map :last-op [++ pos]]]
[[:symbol :keyword] [and [== [car code] :label]
[tree/set! sym-map [cadr code] pos]]]
[:pair [set! pos [assemble/build-sym-map [car code] sym-map pos]]]]
[cdr! code]]
pos]
[defun assemble/relocate-op [code sym-map pos out]
[def target [tree/ref sym-map [cadr code]]]
[def off [- [+ target [cadddr code]] pos]]
[array/set! out [++ pos] [int->bytecode-op [logand [>> off [caddr code]] #xFF]]]
pos]
[defun assemble/emit-relocated-ops [code sym-map pos out]
[if [== [car code] :relocate]
[set! pos [assemble/relocate-op code sym-map pos out]]
[for-in [op code]
[case [type-of op]
[:bytecode-op [array/set! out [++ pos] op]]
[:pair [set! pos [assemble/emit-relocated-ops op sym-map pos out]]]]]]
pos]
[def assemble/verbose #f]
[defun assemble* [code]
"Assemble all arguments into a single :bytecode-array"
[def sym-map @[]]
[and assemble/verbose [println [cat [ansi-blue "Input:\n" [str/write code]]]]]
[assemble/build-sym-map code sym-map 0]
[and assemble/verbose [println [cat [ansi-yellow "Symbol Map:\n" [str/write sym-map]]]]]
[def out [array/allocate [tree/ref sym-map :last-op]]]
[assemble/emit-relocated-ops code sym-map -1 out]
[and assemble/verbose [println [cat [ansi-green "Output:\n" [str/write out]]]]]
[arr->bytecode-arr out]]
[defun assemble l
"Assemble all arguments into a single :bytecode-array"
[assemble* l]]
[defmacro asmrun ops
"Assemble and evaluate all bytecode arguments"
`[bytecode-eval [assemble ~@ops]]]
