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|
(ns lux.compiler.case
(:require (clojure [set :as set]
[template :refer [do-template]])
[clojure.core.match :as M :refer [match matchv]]
clojure.core.match.array
(lux [base :as & :refer [|do return* return fail fail* |let]]
[type :as &type]
[lexer :as &lexer]
[parser :as &parser]
[analyser :as &analyser]
[host :as &host])
[lux.compiler.base :as &&])
(:import (org.objectweb.asm Opcodes
Label
ClassWriter
MethodVisitor)))
;; [Utils]
(let [+tag-sig+ (&host/->type-signature "java.lang.String")
+oclass+ (&host/->class "java.lang.Object")
+equals-sig+ (str "(" (&host/->type-signature "java.lang.Object") ")Z")]
(defn ^:private compile-match [writer ?match $target $else]
;; (prn 'compile-match (aget ?match 0) $target $else)
(matchv ::M/objects [?match]
[["StoreTestAC" ?idx]]
(doto writer
(.visitVarInsn Opcodes/ASTORE ?idx)
(.visitJumpInsn Opcodes/GOTO $target))
[["BoolTestAC" ?value]]
(doto writer
(.visitInsn Opcodes/DUP)
(.visitMethodInsn Opcodes/INVOKEVIRTUAL (&host/->class "java.lang.Boolean") "booleanValue" "()Z")
(.visitLdcInsn ?value)
(.visitJumpInsn Opcodes/IF_ICMPNE $else)
(.visitInsn Opcodes/POP)
(.visitJumpInsn Opcodes/GOTO $target))
[["IntTestAC" ?value]]
(doto writer
(.visitInsn Opcodes/DUP)
(.visitMethodInsn Opcodes/INVOKEVIRTUAL (&host/->class "java.lang.Long") "longValue" "()J")
(.visitLdcInsn ?value)
(.visitInsn Opcodes/LCMP)
(.visitJumpInsn Opcodes/IFNE $else)
(.visitInsn Opcodes/POP)
(.visitJumpInsn Opcodes/GOTO $target))
[["RealTestAC" ?value]]
(doto writer
(.visitInsn Opcodes/DUP)
(.visitMethodInsn Opcodes/INVOKEVIRTUAL (&host/->class "java.lang.Double") "doubleValue" "()D")
(.visitLdcInsn ?value)
(.visitInsn Opcodes/DCMPL)
(.visitJumpInsn Opcodes/IFNE $else)
(.visitInsn Opcodes/POP)
(.visitJumpInsn Opcodes/GOTO $target))
[["CharTestAC" ?value]]
(doto writer
(.visitInsn Opcodes/DUP)
(.visitMethodInsn Opcodes/INVOKEVIRTUAL (&host/->class "java.lang.Character") "charValue" "()C")
(.visitLdcInsn ?value)
(.visitJumpInsn Opcodes/IF_ICMPNE $else)
(.visitInsn Opcodes/POP)
(.visitJumpInsn Opcodes/GOTO $target))
[["TextTestAC" ?value]]
(doto writer
(.visitInsn Opcodes/DUP)
(.visitLdcInsn ?value)
(.visitMethodInsn Opcodes/INVOKEVIRTUAL (&host/->class "java.lang.Object") "equals" (str "(" (&host/->type-signature "java.lang.Object") ")Z"))
(.visitJumpInsn Opcodes/IFEQ $else)
(.visitInsn Opcodes/POP)
(.visitJumpInsn Opcodes/GOTO $target))
[["TupleTestAC" ?members]]
(doto writer
(.visitTypeInsn Opcodes/CHECKCAST "[Ljava/lang/Object;")
(-> (doto (.visitInsn Opcodes/DUP)
(.visitLdcInsn (int idx))
(.visitInsn Opcodes/AALOAD)
(compile-match test $next $sub-else)
(.visitLabel $sub-else)
(.visitInsn Opcodes/POP)
(.visitJumpInsn Opcodes/GOTO $else)
(.visitLabel $next))
(->> (|let [[idx test] idx+member
$next (new Label)
$sub-else (new Label)])
(doseq [idx+member (&/->seq (&/zip2 (&/|range (&/|length ?members)) ?members))])))
(.visitInsn Opcodes/POP)
(.visitJumpInsn Opcodes/GOTO $target))
[["VariantTestAC" [?tag ?test]]]
(doto writer
(.visitTypeInsn Opcodes/CHECKCAST "[Ljava/lang/Object;")
(.visitInsn Opcodes/DUP)
(.visitLdcInsn (int 0))
(.visitInsn Opcodes/AALOAD)
(.visitLdcInsn ?tag)
(.visitMethodInsn Opcodes/INVOKEVIRTUAL +oclass+ "equals" +equals-sig+)
(.visitJumpInsn Opcodes/IFEQ $else)
(.visitInsn Opcodes/DUP)
(.visitLdcInsn (int 1))
(.visitInsn Opcodes/AALOAD)
(-> (doto (compile-match ?test $value-then $value-else)
(.visitLabel $value-then)
(.visitInsn Opcodes/POP)
(.visitJumpInsn Opcodes/GOTO $target)
(.visitLabel $value-else)
(.visitInsn Opcodes/POP)
(.visitJumpInsn Opcodes/GOTO $else))
(->> (let [$value-then (new Label)
$value-else (new Label)]))))
)))
(defn ^:private separate-bodies [patterns]
;; (prn 'separate-bodies (aget matches 0))
(|let [[_ mappings patterns*] (&/fold (fn [$id+mappings+=matches pattern+body]
(|let [[$id mappings =matches] $id+mappings+=matches
[pattern body] pattern+body]
(&/T (inc $id) (&/|put $id body mappings) (&/|put $id pattern =matches))))
(&/T 0 (&/|table) (&/|table))
patterns)]
(&/T mappings (&/|reverse patterns*))))
(let [ex-class (&host/->class "java.lang.IllegalStateException")]
(defn ^:private compile-pattern-matching [writer compile mappings patterns $end]
;; (prn 'compile-pattern-matching ?matches $end)
(let [entries (&/|map (fn [?branch+?body]
(|let [[?branch ?body] ?branch+?body
label (new Label)]
(&/T (&/T ?branch label)
(&/T label ?body))))
mappings)
mappings* (&/|map &/|first entries)]
(doto writer
(-> (doto (compile-match ?match (&/|get ?body mappings*) $else)
(.visitLabel $else))
(->> (|let [[?body ?match] ?body+?match])
(doseq [?body+?match (&/->seq patterns)
:let [;; _ (prn 'compile-pattern-matching/pattern pattern)
;; _ (prn '?body+?match (alength ?body+?match) (aget ?body+?match 0))
_ (prn '?body+?match (aget ?body+?match 0))
$else (new Label)]])))
(.visitInsn Opcodes/POP)
(.visitTypeInsn Opcodes/NEW ex-class)
(.visitInsn Opcodes/DUP)
(.visitMethodInsn Opcodes/INVOKESPECIAL ex-class "<init>" "()V")
(.visitInsn Opcodes/ATHROW))
(&/map% (fn [?label+?body]
(|let [[?label ?body] ?label+?body]
(|do [:let [_ (.visitLabel writer ?label)]
ret (compile ?body)
:let [_ (.visitJumpInsn writer Opcodes/GOTO $end)]]
(return ret))))
(&/|map &/|second entries))
)))
;; [Resources]
(defn compile-case [compile *type* ?value ?matches]
;; (prn 'compile-case ?value ?matches)
(|do [*writer* &/get-writer
:let [$end (new Label)]
_ (compile ?value)
_ (|let [[mappings patterns] (separate-bodies ?matches)]
(compile-pattern-matching *writer* compile mappings patterns $end))
:let [_ (.visitLabel *writer* $end)]]
(return nil)))
|
