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;; Copyright (c) Eduardo Julian. All rights reserved.
;; This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
;; If a copy of the MPL was not distributed with this file,
;; You can obtain one at http://mozilla.org/MPL/2.0/.
(ns lux.compiler.case
(:require (clojure [set :as set]
[template :refer [do-template]])
clojure.core.match
clojure.core.match.array
(lux [base :as & :refer [|do return* return fail fail* |let |case]]
[type :as &type]
[lexer :as &lexer]
[parser :as &parser]
[analyser :as &analyser]
[host :as &host])
[lux.analyser.case :as &a-case]
[lux.compiler.base :as &&])
(:import (org.objectweb.asm Opcodes
Label
ClassWriter
MethodVisitor)))
;; [Utils]
(defn ^:private compile-match [^MethodVisitor writer ?match $target $else]
(|case ?match
(&a-case/$StoreTestAC ?idx)
(if (< ?idx 0)
(doto writer
(.visitInsn Opcodes/POP) ;; Basically, a No-Op
(.visitJumpInsn Opcodes/GOTO $target))
(doto writer
(.visitVarInsn Opcodes/ASTORE ?idx)
(.visitJumpInsn Opcodes/GOTO $target)))
(&a-case/$BoolTestAC ?value)
(doto writer
(.visitTypeInsn Opcodes/CHECKCAST "java/lang/Boolean")
(.visitInsn Opcodes/DUP)
(.visitMethodInsn Opcodes/INVOKEVIRTUAL "java/lang/Boolean" "booleanValue" "()Z")
(.visitLdcInsn ?value)
(.visitJumpInsn Opcodes/IF_ICMPNE $else)
(.visitInsn Opcodes/POP)
(.visitJumpInsn Opcodes/GOTO $target))
(&a-case/$IntTestAC ?value)
(doto writer
(.visitTypeInsn Opcodes/CHECKCAST "java/lang/Long")
(.visitInsn Opcodes/DUP)
(.visitMethodInsn Opcodes/INVOKEVIRTUAL "java/lang/Long" "longValue" "()J")
(.visitLdcInsn (long ?value))
(.visitInsn Opcodes/LCMP)
(.visitJumpInsn Opcodes/IFNE $else)
(.visitInsn Opcodes/POP)
(.visitJumpInsn Opcodes/GOTO $target))
(&a-case/$RealTestAC ?value)
(doto writer
(.visitTypeInsn Opcodes/CHECKCAST "java/lang/Double")
(.visitInsn Opcodes/DUP)
(.visitMethodInsn Opcodes/INVOKEVIRTUAL "java/lang/Double" "doubleValue" "()D")
(.visitLdcInsn (double ?value))
(.visitInsn Opcodes/DCMPL)
(.visitJumpInsn Opcodes/IFNE $else)
(.visitInsn Opcodes/POP)
(.visitJumpInsn Opcodes/GOTO $target))
(&a-case/$CharTestAC ?value)
(doto writer
(.visitTypeInsn Opcodes/CHECKCAST "java/lang/Character")
(.visitInsn Opcodes/DUP)
(.visitMethodInsn Opcodes/INVOKEVIRTUAL "java/lang/Character" "charValue" "()C")
(.visitLdcInsn ?value)
(.visitJumpInsn Opcodes/IF_ICMPNE $else)
(.visitInsn Opcodes/POP)
(.visitJumpInsn Opcodes/GOTO $target))
(&a-case/$TextTestAC ?value)
(doto writer
(.visitInsn Opcodes/DUP)
(.visitLdcInsn ?value)
(.visitMethodInsn Opcodes/INVOKEVIRTUAL "java/lang/Object" "equals" "(Ljava/lang/Object;)Z")
(.visitJumpInsn Opcodes/IFEQ $else)
(.visitInsn Opcodes/POP)
(.visitJumpInsn Opcodes/GOTO $target))
(&a-case/$TupleTestAC ?members)
(|case ?members
(&/$Nil)
(doto writer
(.visitInsn Opcodes/POP)
(.visitJumpInsn Opcodes/GOTO $target))
(&/$Cons ?member (&/$Nil))
(compile-match ?member $target $else)
_
(let [num-members (&/|length ?members)]
(doto writer
(.visitTypeInsn Opcodes/CHECKCAST "[Ljava/lang/Object;")
(-> (doto (.visitInsn Opcodes/DUP)
(.visitLdcInsn (int idx))
(.visitMethodInsn Opcodes/INVOKESTATIC "lux/LuxUtils" (if is-tail? "product_getRight" "product_getLeft") "([Ljava/lang/Object;I)Ljava/lang/Object;")
(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)
is-tail? (= (dec num-members) idx)])
(doseq [idx+member (->> ?members &/enumerate &/->seq)])))
(.visitInsn Opcodes/POP)
(.visitJumpInsn Opcodes/GOTO $target))))
(&a-case/$VariantTestAC ?tag ?count ?test)
(doto writer
(.visitTypeInsn Opcodes/CHECKCAST "[Ljava/lang/Object;")
(.visitInsn Opcodes/DUP)
(.visitLdcInsn (int 1))
(.visitInsn Opcodes/AALOAD)
(.visitLdcInsn ?tag)
(&&/wrap-long)
(.visitMethodInsn Opcodes/INVOKEVIRTUAL "java/lang/Object" "equals" "(Ljava/lang/Object;)Z")
(.visitJumpInsn Opcodes/IFEQ $else)
(.visitInsn Opcodes/DUP)
(.visitLdcInsn (int 2))
(.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)
$value-else (new Label)]))))
))
(defn ^:private separate-bodies [patterns]
(|let [[_ mappings patterns*] (&/fold (fn [$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*)])))
(defn ^:private compile-pattern-matching [^MethodVisitor writer compile mappings patterns $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 $else))
(->> (|let [[?body ?match] ?body+?match])
(doseq [?body+?match (&/->seq patterns)
:let [$else (new Label)]])))
(.visitInsn Opcodes/POP)
(.visitTypeInsn Opcodes/NEW "java/lang/IllegalStateException")
(.visitInsn Opcodes/DUP)
(.visitMethodInsn Opcodes/INVOKESPECIAL "java/lang/IllegalStateException" "<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 $end)]]
(return ret))))
(&/|map &/|second entries))
))
;; [Resources]
(defn compile-case [compile ?value ?matches]
(|do [^MethodVisitor *writer* &/get-writer
:let [$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)))
|
