application/octet-stream
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;; Nujel - Copyright (C) 2020-2021 - Benjamin Vincent Schulenburg
;; This project uses the MIT license, a copy should be included under /LICENSE
;;
;; Contains the bytecode assembler, so we don't have to write opcodes directly
[defn int-fit-in-byte? [a]
[and [<= a 127] [>= a -128]]]
[defn $push/int [a]
"[] -> [a]"
"Push A on the stack as an :int"
[if [int-fit-in-byte? a]
[$push/int/byte a]
[$push/val a]]]
[defn $push/int/byte [a]
"[] -> [a]"
"Push A on the stack as an :int that fits within a byte"
[when-not [int-fit-in-byte? a]
[throw [list :invalid-bc-op "$push/int/byte can only push a signed 8-bit value" a [current-lambda]]]]
[list #$2 [int->bytecode-op a]]]
[defn $apply/optimize? [fun arg-count]
[case fun
[[+ - * / rem] [= arg-count 2]]
[[zero? car cdr add/int cons < <= = >= >] #t]]]
[defn $apply/optimized [arg-count fun]
"arguments -> [result]"
"Read arg-count arguments from the stack, apply the to fun and push the result on the stack"
[case arg-count
[1 [case fun
[car [$car]]
[cdr [$cdr]]
[zero? [$zero?]]
[otherwise [exception :arity-error "Wrong number of arguments for that function" fun]]]]
[2 [case fun
[add/int [$add/int]]
[+ [$add]]
[- [$sub]]
[* [$mul]]
[/ [$div]]
[rem [$rem]]
[cons [$cons]]
[< [$<]]
[<= [$<=]]
[= [$=]]
[>= [$>=]]
[> [$>]]
[otherwise [exception :arity-error "Wrong number of arguments for that function" fun]]]]
[otherwise [exception :arity-error "Wrong number of arguments for that function" fun]]]]
[defn $apply [arg-count fun]
[when [> arg-count 255]
[exception :arity-error "Functions can only take up to 255 arguments directly, you can use [apply] instead though" arg-count]]
[list #$4
[int->bytecode-op arg-count]]]
[defn $try [target]
"[] -> []"
"Try something, jumping to target if an exception occurs"
[list #$19 [list :relocate target 8 0 [int->bytecode-op 0]]
[list :relocate target 0 1 [int->bytecode-op 0]]]]
[defn $jmp [target]
[list #$9
[list :relocate target 8 0 [int->bytecode-op 0]]
[list :relocate target 0 1 [int->bytecode-op 0]]]]
[defn $push/val [v]
"[] -> [v]"
"Pushes v onto the stack"
[when [nil? v]
[throw [list :invalid-bc-op "Can't push #nil as a normal lVal" v [current-lambda]]]]
[list #$1A
[list :literal v]]]
[def $push/val/ext $push/val]
[defn $get/val [v]
"[] -> [v]"
"Resolve V and get the associated value on the stack"
[when-not [symbol? v]
[throw [list :invalid-bc-op "Can only get symbol" v [current-lambda]]]]
[list #$E
[list :literal v]]]
[defn $set/val [v]
"[v] -> [v]"
"Resolve V and get the associated value on the stack"
[when-not [symbol? v]
[throw [list :invalid-bc-op "Can only get symbol" v [current-lambda]]]]
[list #$5
[list :literal v]]]
[defn $def/val [v]
"[v] -> [v]"
"Resolve V and get the associated value on the stack"
[when-not [symbol? v]
[throw [list :invalid-bc-op "Can only get symbol" v [current-lambda]]]]
[list #$7
[list :literal v]]]
[defn $jt [target]
[list #$A
[list :relocate target 8 0 [int->bytecode-op 0]]
[list :relocate target 0 1 [int->bytecode-op 0]]]]
[defn $jf [target]
[list #$B
[list :relocate target 8 0 [int->bytecode-op 0]]
[list :relocate target 0 1 [int->bytecode-op 0]]]]
[defn $fn [name args docs body]
[list #$25
[val->bytecode-op name]
[val->bytecode-op args]
[val->bytecode-op docs]
[val->bytecode-op body]]]
[defn $macro* [name args docs body]
[list #$26
[val->bytecode-op name]
[val->bytecode-op args]
[val->bytecode-op docs]
[val->bytecode-op body]]]
[defn assemble/build-sym-map [code sym-map pos]
[while code
[case [type-of [car code]]
[:bytecode-op [tree/set! sym-map :last-op [inc! pos]]]
[:keyword [case [car code]
[:label [tree/set! sym-map [cadr code] pos]
[cdr! code]]
[:literal [cdr! code]]]]
[:pair [set! pos [assemble/build-sym-map [car code] sym-map pos]]]]
[cdr! code]]
[return pos]]
[defn 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 [inc! pos] [int->bytecode-op [bit-and [bit-shift-right off [caddr code]] #xFF]]]
[return pos]]
[defn assemble/emit-relocated-ops [code sym-map pos out]
[if [= [car code] :relocate]
[set! pos [assemble/relocate-op code sym-map pos out]]
[doseq [op code pos]
[case [type-of op]
[:bytecode-op [array/set! out [inc! pos] op]]
[:pair [set! pos [assemble/emit-relocated-ops op sym-map pos out]]]]]]]
[defn literal-index->bytecode-op [i]
[if [< i 256]
[int->bytecode-op i]
[list [int->bytecode-op [bit-and [bit-shift-right i 8] #xFF]]
[int->bytecode-op [bit-and i #xFF]]]]]
[def *max-literal-arr* 0]
[defn assemble/add-literal [lit lit-arr]
[when [>= [array/length lit-arr] 65535]
[exception :out-of-bounds "Can only store up to 255 literals per bytecode-arr" code]]
[when [not= [type-of lit] :pair]
[dotimes [i [array/length lit-arr]]
[when [equal? [array/ref lit-arr i] lit]
[return [literal-index->bytecode-op i]]]]]
[array/length! lit-arr [+ 1 [array/length lit-arr]]]
[array/set! lit-arr [- [array/length lit-arr] 1] lit]
#;[when [> [array/length lit-arr] *max-literal-arr*]
[set! *max-literal-arr* [array/length lit-arr]]
[pfmtln "Max: {*max-literal-arr*}"]]
[literal-index->bytecode-op [- [array/length lit-arr] 1]]]
[defn assemble/build-lit-arr [code lit-arr]
[when-not code [return #nil]]
[cond [[pair? [car code]]
[cons [assemble/build-lit-arr [car code] lit-arr]
[assemble/build-lit-arr [cdr code] lit-arr]]]
[[and [= [car code] #$1A]
[= [car [cadr code]] :literal]]
[cdr! code] ; Skip the literal, especially important for :bytecode-op literals
[def index-op [assemble/add-literal [cadar code] lit-arr]]
[cons [if [pair? index-op]
#$6
#$1A]
[cons index-op
[assemble/build-lit-arr [cdr code] lit-arr]]]]
[[and [= [car code] #$E]
[= [car [cadr code]] :literal]]
[cdr! code] ; Skip the literal, especially important for :bytecode-op literals
[def index-op [assemble/add-literal [cadar code] lit-arr]]
[cons [if [pair? index-op]
#$F
#$E]
[cons index-op
[assemble/build-lit-arr [cdr code] lit-arr]]]]
[[and [= [car code] #$5]
[= [car [cadr code]] :literal]]
[cdr! code] ; Skip the literal, especially important for :bytecode-op literals
[def index-op [assemble/add-literal [cadar code] lit-arr]]
[cons [if [pair? index-op]
#$10
#$5]
[cons index-op
[assemble/build-lit-arr [cdr code] lit-arr]]]]
[[and [= [car code] #$7]
[= [car [cadr code]] :literal]]
[cdr! code] ; Skip the literal, especially important for :bytecode-op literals
[def index-op [assemble/add-literal [cadar code] lit-arr]]
[cons [if [pair? index-op]
#$8
#$7]
[cons index-op
[assemble/build-lit-arr [cdr code] lit-arr]]]]
[[= :literal [car code]]
[cdr! code] ; Skip the literal, especially important for :bytecode-op literals
[cons [assemble/add-literal [car code] lit-arr]
[assemble/build-lit-arr [cdr code] lit-arr]]]
[otherwise [cons [car code]
[assemble/build-lit-arr [cdr code] lit-arr]]]]]
[defn assemble/flatten [code ret]
[when-not code [return ret]]
[when-not [pair? code] [return ret]]
[set! ret [assemble/flatten [cdr code] ret]]
[if [and [pair? [car code]]
[not [keyword? [caar code]]]]
[assemble/flatten [car code] ret]
[cons [car code] ret]]]
[defn assemble* [code]
"Assemble all arguments into a single :bytecode-array"
[def sym-map @[]]
[def lit-arr #[]]
[def tmp [-> [assemble/flatten code]
[assemble/build-lit-arr lit-arr]]]
[assemble/build-sym-map tmp sym-map 0]
[def out [array/allocate [tree/ref sym-map :last-op]]]
[assemble/emit-relocated-ops tmp sym-map -1 out]
[arr->bytecode-arr out lit-arr]]
[defn 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] [current-closure]]]
[defn asmdebug ops
"Assemble and evaluate all bytecode arguments"
[def bc [apply assemble ops]]
[disassemble bc]
[def v [bytecode-eval* bc [current-closure]]]
[pfmtln "Result: {:?}{}" v [type-of v]]]
