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|
(ns lux.compiler.jvm.case
(:require (clojure [set :as set]
[template :refer [do-template]])
clojure.core.match
clojure.core.match.array
(lux [base :as & :refer [|do return* return |let |case]]
[type :as &type]
[lexer :as &lexer]
[parser :as &parser]
[analyser :as &analyser]
[host :as &host]
[optimizer :as &o])
[lux.analyser.case :as &a-case]
[lux.compiler.jvm.base :as &&]
[lux.compiler.jvm.rt :as &rt])
(:import (org.objectweb.asm Opcodes
Label
ClassWriter
MethodVisitor)))
;; [Utils]
(defn ^:private pop-alt-stack [^MethodVisitor writer stack-depth]
(cond (= 0 stack-depth)
writer
(= 1 stack-depth)
(doto writer
(.visitInsn Opcodes/POP))
(= 2 stack-depth)
(doto writer
(.visitInsn Opcodes/POP2))
:else ;; > 2
(doto writer
(.visitInsn Opcodes/POP2)
(pop-alt-stack (- stack-depth 2)))))
(defn ^:private stack-peek [^MethodVisitor writer]
(doto writer
(.visitInsn Opcodes/DUP)
&rt/peekI))
(defn ^:private compile-pattern*
"(-> MethodVisitor Case-Pattern (List Label) Int Label MethodVisitor)"
[^MethodVisitor writer bodies stack-depth $else pm]
(|case pm
(&o/$ExecPM _body-idx)
(|case (&/|at _body-idx bodies)
(&/$Some $body)
(doto writer
(pop-alt-stack stack-depth)
(.visitJumpInsn Opcodes/GOTO $body))
(&/$None)
(assert false))
(&o/$PopPM)
(&rt/popI writer)
(&o/$BindPM _var-id)
(doto writer
stack-peek
(.visitVarInsn Opcodes/ASTORE _var-id)
&rt/popI)
(&o/$BitPM _value)
(doto writer
stack-peek
&&/unwrap-boolean
(.visitJumpInsn (if _value Opcodes/IFEQ Opcodes/IFNE) $else))
(&o/$NatPM _value)
(doto writer
stack-peek
&&/unwrap-long
(.visitLdcInsn (long _value))
(.visitInsn Opcodes/LCMP)
(.visitJumpInsn Opcodes/IFNE $else))
(&o/$IntPM _value)
(doto writer
stack-peek
&&/unwrap-long
(.visitLdcInsn (long _value))
(.visitInsn Opcodes/LCMP)
(.visitJumpInsn Opcodes/IFNE $else))
(&o/$RevPM _value)
(doto writer
stack-peek
&&/unwrap-long
(.visitLdcInsn (long _value))
(.visitInsn Opcodes/LCMP)
(.visitJumpInsn Opcodes/IFNE $else))
(&o/$FracPM _value)
(doto writer
stack-peek
&&/unwrap-double
(.visitLdcInsn (double _value))
(.visitInsn Opcodes/DCMPL)
(.visitJumpInsn Opcodes/IFNE $else))
(&o/$TextPM _value)
(doto writer
stack-peek
(.visitLdcInsn _value)
(.visitMethodInsn Opcodes/INVOKEVIRTUAL "java/lang/Object" "equals" "(Ljava/lang/Object;)Z")
(.visitJumpInsn Opcodes/IFEQ $else))
(&o/$TuplePM (&/$Left lefts))
(let [accessI (if (= 0 lefts)
#(doto ^MethodVisitor %
(.visitInsn Opcodes/AALOAD))
#(doto ^MethodVisitor %
(.visitMethodInsn Opcodes/INVOKESTATIC &rt/rt-class "tuple_left" "([Ljava/lang/Object;I)Ljava/lang/Object;")))]
(doto writer
stack-peek
(.visitTypeInsn Opcodes/CHECKCAST "[Ljava/lang/Object;")
(.visitLdcInsn (int lefts))
accessI
(.visitMethodInsn Opcodes/INVOKESTATIC &rt/rt-class "pm_stack_push" "([Ljava/lang/Object;Ljava/lang/Object;)[Ljava/lang/Object;")))
(&o/$TuplePM (&/$Right _idx))
(doto writer
stack-peek
(.visitTypeInsn Opcodes/CHECKCAST "[Ljava/lang/Object;")
(.visitLdcInsn (int (dec _idx)))
(.visitMethodInsn Opcodes/INVOKESTATIC &rt/rt-class "tuple_right" "([Ljava/lang/Object;I)Ljava/lang/Object;")
(.visitMethodInsn Opcodes/INVOKESTATIC &rt/rt-class "pm_stack_push" "([Ljava/lang/Object;Ljava/lang/Object;)[Ljava/lang/Object;"))
(&o/$VariantPM _idx+)
(|let [$success (new Label)
$fail (new Label)
[_lefts _right?] (|case _idx+
(&/$Left _idx)
(&/T [_idx false])
(&/$Right _idx)
(&/T [(dec _idx) true]))
_ (doto writer
stack-peek
(.visitTypeInsn Opcodes/CHECKCAST "[Ljava/lang/Object;")
(.visitLdcInsn (int _lefts)))
_ (if _right?
(.visitLdcInsn writer "")
(.visitInsn writer Opcodes/ACONST_NULL))]
(doto writer
(.visitMethodInsn Opcodes/INVOKESTATIC &rt/rt-class "sum_get" "([Ljava/lang/Object;ILjava/lang/Object;)Ljava/lang/Object;")
(.visitInsn Opcodes/DUP)
(.visitJumpInsn Opcodes/IFNULL $fail)
(.visitJumpInsn Opcodes/GOTO $success)
(.visitLabel $fail)
(.visitInsn Opcodes/POP)
(.visitJumpInsn Opcodes/GOTO $else)
(.visitLabel $success)
(.visitMethodInsn Opcodes/INVOKESTATIC &rt/rt-class "pm_stack_push" "([Ljava/lang/Object;Ljava/lang/Object;)[Ljava/lang/Object;")))
(&o/$SeqPM _left-pm _right-pm)
(doto writer
(compile-pattern* bodies stack-depth $else _left-pm)
(compile-pattern* bodies stack-depth $else _right-pm))
(&o/$AltPM _left-pm _right-pm)
(|let [$alt-else (new Label)]
(doto writer
(.visitInsn Opcodes/DUP)
(compile-pattern* bodies (inc stack-depth) $alt-else _left-pm)
(.visitLabel $alt-else)
(.visitInsn Opcodes/POP)
(compile-pattern* bodies stack-depth $else _right-pm)))
))
(defn ^:private compile-pattern [^MethodVisitor writer bodies pm $end]
(|let [$else (new Label)]
(doto writer
(compile-pattern* bodies 1 $else pm)
(.visitLabel $else)
(.visitInsn Opcodes/POP)
(.visitMethodInsn Opcodes/INVOKESTATIC &rt/rt-class "pm_fail" "()V")
(.visitInsn Opcodes/ACONST_NULL)
(.visitJumpInsn Opcodes/GOTO $end))))
(defn ^:private compile-bodies [^MethodVisitor writer compile bodies-labels ?bodies $end]
(&/map% (fn [label+body]
(|let [[_label _body] label+body]
(|do [:let [_ (.visitLabel writer _label)]
_ (compile _body)
:let [_ (.visitJumpInsn writer Opcodes/GOTO $end)]]
(return nil))))
(&/zip2 bodies-labels ?bodies)))
;; [Resources]
(defn compile-case [compile ?value ?pm ?bodies]
(|do [^MethodVisitor *writer* &/get-writer
:let [$end (new Label)
bodies-labels (&/|map (fn [_] (new Label)) ?bodies)]
:let [_ (doto *writer*
(.visitInsn Opcodes/ACONST_NULL))]
_ (compile ?value)
:let [_ (doto *writer*
(.visitMethodInsn Opcodes/INVOKESTATIC &rt/rt-class "pm_stack_push" "([Ljava/lang/Object;Ljava/lang/Object;)[Ljava/lang/Object;"))
_ (compile-pattern *writer* bodies-labels ?pm $end)]
_ (compile-bodies *writer* compile bodies-labels ?bodies $end)
:let [_ (.visitLabel *writer* $end)]]
(return nil)))
|
