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(ns lux.compiler.jvm.function
(:require (clojure [string :as string]
[set :as set]
[template :refer [do-template]])
clojure.core.match
clojure.core.match.array
(lux [base :as & :refer [|do return* return |case |let]]
[type :as &type]
[lexer :as &lexer]
[parser :as &parser]
[analyser :as &analyser]
[host :as &host]
[optimizer :as &o])
[lux.host.generics :as &host-generics]
[lux.analyser.base :as &a]
(lux.compiler.jvm [base :as &&]))
(:import (org.objectweb.asm Opcodes
Label
ClassWriter
MethodVisitor)))
;; [Utils]
(def ^:private field-sig (&host-generics/->type-signature "java.lang.Object"))
(def ^:private function-return-sig (&host-generics/->type-signature "java.lang.Object"))
(def ^:private <init>-return "V")
(defn ^:private ^String reset-signature [function-class]
(str "()" (&host-generics/->type-signature function-class)))
(defn ^:private ^MethodVisitor get-num-partials! [^MethodVisitor method-writer]
(doto method-writer
(.visitVarInsn Opcodes/ALOAD 0)
(.visitFieldInsn Opcodes/GETFIELD &&/function-class &&/partials-field "I")))
(defn ^:private ^MethodVisitor inc-int! [^MethodVisitor method-writer by]
(doto method-writer
(.visitLdcInsn (int by))
(.visitInsn Opcodes/IADD)))
(defn ^:private ^MethodVisitor get-field! [^MethodVisitor method-writer class-name field-name]
(doto method-writer
(.visitVarInsn Opcodes/ALOAD 0)
(.visitFieldInsn Opcodes/GETFIELD class-name field-name field-sig)))
(defn ^:private ^MethodVisitor put-field! [^MethodVisitor method-writer class-name field-name field-sig value-thunk]
(doto method-writer
(.visitVarInsn Opcodes/ALOAD 0)
value-thunk
(.visitFieldInsn Opcodes/PUTFIELD class-name field-name field-sig)))
(defn ^:private ^MethodVisitor fill-nulls! [^MethodVisitor method-writer amount]
(doto method-writer
(-> (.visitInsn Opcodes/ACONST_NULL)
(->> (dotimes [_ amount])))))
(defn ^:private ^MethodVisitor consecutive-args [^MethodVisitor method-writer start amount]
(doto method-writer
(-> (.visitVarInsn Opcodes/ALOAD (+ start idx))
(->> (dotimes [idx amount])))))
(defn ^:private ^MethodVisitor consecutive-applys [^MethodVisitor method-writer start amount]
(let [max-args-num (min amount &&/num-apply-variants)]
(doto method-writer
(.visitTypeInsn Opcodes/CHECKCAST &&/function-class)
(consecutive-args start max-args-num)
(.visitMethodInsn Opcodes/INVOKEVIRTUAL &&/function-class &&/apply-method (&&/apply-signature max-args-num))
(-> (consecutive-applys (+ start &&/num-apply-variants) (- amount &&/num-apply-variants))
(->> (when (> amount &&/num-apply-variants)))))))
(defn ^:private function-impl-signature [arity]
(str "(" (&/fold str "" (&/|repeat arity field-sig)) ")" function-return-sig))
(defn ^:private function-<init>-signature [env arity]
(if (> arity 1)
(str "(" (&/fold str "" (&/|repeat (&/|length env) field-sig)) "I" (&/fold str "" (&/|repeat (dec arity) field-sig)) ")"
<init>-return)
(str "(" (&/fold str "" (&/|repeat (&/|length env) field-sig)) ")"
<init>-return)))
(defn ^:private init-function [^MethodVisitor method-writer arity closure-length]
(if (= 1 arity)
(doto method-writer
(.visitLdcInsn (int 0))
(.visitMethodInsn Opcodes/INVOKESPECIAL &&/function-class "<init>" "(I)V"))
(doto method-writer
(.visitVarInsn Opcodes/ILOAD (inc closure-length))
(.visitMethodInsn Opcodes/INVOKESPECIAL &&/function-class "<init>" "(I)V"))))
(defn ^:private add-function-<init> [^ClassWriter class class-name arity env]
(let [closure-length (&/|length env)]
(doto (.visitMethod class Opcodes/ACC_PUBLIC "<init>" (function-<init>-signature env arity) nil nil)
(.visitCode)
;; Do normal object initialization
(.visitVarInsn Opcodes/ALOAD 0)
(init-function arity closure-length)
;; Add all of the closure variables
(-> (put-field! class-name (str &&/closure-prefix ?captured-id) field-sig #(.visitVarInsn ^MethodVisitor % Opcodes/ALOAD (inc ?captured-id)))
(->> (|let [[?name [_ (&o/$captured _ ?captured-id ?source)]] ?name+?captured])
(doseq [?name+?captured (&/->seq env)])))
;; Add all the partial arguments
(-> (put-field! class-name (str &&/partial-prefix idx*) field-sig #(.visitVarInsn ^MethodVisitor % Opcodes/ALOAD partial-register))
(->> (|let [partial-register (+ (inc idx*) (inc closure-length))])
(dotimes [idx* (dec arity)])))
;; Finish
(.visitInsn Opcodes/RETURN)
(.visitMaxs 0 0)
(.visitEnd))))
(let [impl-flags (+ Opcodes/ACC_PUBLIC Opcodes/ACC_FINAL Opcodes/ACC_STRICT)]
(defn ^:private add-function-impl [^ClassWriter class class-name compile arity impl-body]
(let [$begin (new Label)]
(&/with-writer (doto (.visitMethod class impl-flags "impl" (function-impl-signature arity) nil nil)
(.visitCode)
(.visitLabel $begin))
(|do [^MethodVisitor *writer* &/get-writer
ret (compile $begin impl-body)
:let [_ (doto *writer*
(.visitInsn Opcodes/ARETURN)
(.visitMaxs 0 0)
(.visitEnd))]]
(return ret))))))
(defn ^:private instance-closure [compile function-class arity closed-over]
(|do [^MethodVisitor *writer* &/get-writer
:let [_ (doto *writer*
(.visitTypeInsn Opcodes/NEW function-class)
(.visitInsn Opcodes/DUP))]
_ (&/map% (fn [?name+?captured]
(|case ?name+?captured
[?name [_ (&o/$captured _ _ ?source)]]
(compile nil ?source)))
closed-over)
:let [_ (when (> arity 1)
(doto *writer*
(.visitLdcInsn (int 0))
(fill-nulls! (dec arity))))]
:let [_ (.visitMethodInsn *writer* Opcodes/INVOKESPECIAL function-class "<init>" (function-<init>-signature closed-over arity))]]
(return nil)))
(defn ^:private add-function-reset [^ClassWriter class-writer class-name arity env]
(if (> arity 1)
(doto (.visitMethod class-writer Opcodes/ACC_PUBLIC "reset" (reset-signature class-name) nil nil)
(.visitCode)
(.visitTypeInsn Opcodes/NEW class-name)
(.visitInsn Opcodes/DUP)
(-> (get-field! class-name (str &&/closure-prefix cidx))
(->> (dotimes [cidx (&/|length env)])))
(.visitLdcInsn (int 0))
(fill-nulls! (dec arity))
(.visitMethodInsn Opcodes/INVOKESPECIAL class-name "<init>" (function-<init>-signature env arity))
(.visitInsn Opcodes/ARETURN)
(.visitMaxs 0 0)
(.visitEnd))
(doto (.visitMethod class-writer Opcodes/ACC_PUBLIC "reset" (reset-signature class-name) nil nil)
(.visitCode)
(.visitVarInsn Opcodes/ALOAD 0)
(.visitInsn Opcodes/ARETURN)
(.visitMaxs 0 0)
(.visitEnd))))
(defn ^:private add-function-apply-n [^ClassWriter class-writer +degree+ class-name arity env compile impl-body]
(if (> arity 1)
(let [num-partials (dec arity)
$default (new Label)
$labels* (map (fn [_] (new Label)) (repeat num-partials nil))
$labels (vec (concat $labels* (list $default)))
method-writer (.visitMethod class-writer (+ Opcodes/ACC_PUBLIC Opcodes/ACC_STRICT) &&/apply-method (&&/apply-signature +degree+) nil nil)
frame-locals (to-array (list class-name "java/lang/Object" "java/lang/Object"))
frame-stack (to-array [Opcodes/INTEGER])
arity-over-extent (- arity +degree+)]
(do (doto method-writer
(.visitCode)
get-num-partials!
(.visitTableSwitchInsn 0 (dec num-partials) $default (into-array Label $labels*))
;; (< stage (- arity +degree+))
(-> (doto (.visitLabel $label)
(.visitTypeInsn Opcodes/NEW class-name)
(.visitInsn Opcodes/DUP)
(-> (get-field! class-name (str &&/closure-prefix cidx))
(->> (dotimes [cidx (&/|length env)])))
get-num-partials!
(inc-int! +degree+)
(-> (get-field! class-name (str &&/partial-prefix idx))
(->> (dotimes [idx stage])))
(consecutive-args 1 +degree+)
(fill-nulls! (- (- num-partials +degree+) stage))
(.visitMethodInsn Opcodes/INVOKESPECIAL class-name "<init>" (function-<init>-signature env arity))
(.visitInsn Opcodes/ARETURN))
(->> (cond (= stage arity-over-extent)
(doto method-writer
(.visitLabel $label)
(.visitVarInsn Opcodes/ALOAD 0)
(-> (.visitMethodInsn Opcodes/INVOKEVIRTUAL class-name "reset" (reset-signature class-name))
(->> (when (not= 0 stage))))
(-> (get-field! class-name (str &&/partial-prefix idx))
(->> (dotimes [idx stage])))
(consecutive-args 1 +degree+)
(.visitMethodInsn Opcodes/INVOKEVIRTUAL class-name "impl" (function-impl-signature arity))
(.visitInsn Opcodes/ARETURN))
(> stage arity-over-extent)
(let [args-to-completion (- arity stage)
args-left (- +degree+ args-to-completion)]
(doto method-writer
(.visitLabel $label)
(.visitVarInsn Opcodes/ALOAD 0)
(.visitMethodInsn Opcodes/INVOKEVIRTUAL class-name "reset" (reset-signature class-name))
(-> (get-field! class-name (str &&/partial-prefix idx))
(->> (dotimes [idx stage])))
(consecutive-args 1 args-to-completion)
(.visitMethodInsn Opcodes/INVOKEVIRTUAL class-name "impl" (function-impl-signature arity))
(consecutive-applys (+ 1 args-to-completion) args-left)
(.visitInsn Opcodes/ARETURN)))
:else)
(doseq [[stage $label] (map vector (range arity) $labels)])))
(.visitMaxs 0 0)
(.visitEnd))
(return nil)))
(let [$begin (new Label)]
(&/with-writer (doto (.visitMethod ^ClassWriter class-writer (+ Opcodes/ACC_PUBLIC Opcodes/ACC_STRICT) &&/apply-method (&&/apply-signature 1) nil nil)
(.visitCode)
(.visitLabel $begin))
(|do [^MethodVisitor *writer* &/get-writer
ret (compile $begin impl-body)
:let [_ (doto *writer*
(.visitInsn Opcodes/ARETURN)
(.visitMaxs 0 0)
(.visitEnd))]]
(return ret))))
))
;; [Exports]
(let [function-flags (+ Opcodes/ACC_PUBLIC Opcodes/ACC_FINAL Opcodes/ACC_SUPER)
datum-flags (+ Opcodes/ACC_PRIVATE Opcodes/ACC_FINAL)]
(defn compile-function [compile ?prev-writer arity ?scope ?env ?body]
(|do [[file-name _ _] &/location
:let [??scope (&/|reverse ?scope)
name (&host/location (&/|tail ??scope))
class-name (str (&host/->module-class (&/|head ??scope)) "/" name)
[^ClassWriter =class save?] (|case ?prev-writer
(&/$Some _writer)
(&/T [_writer false])
(&/$None)
(&/T [(doto (new ClassWriter ClassWriter/COMPUTE_MAXS)
(.visit &host/bytecode-version function-flags
class-name nil &&/function-class (into-array String [])))
true]))
_ (doto =class
(-> (.visitField (+ Opcodes/ACC_PUBLIC Opcodes/ACC_STATIC Opcodes/ACC_FINAL) &&/arity-field "I" nil (int arity))
(doto (.visitEnd)))
(-> (doto (.visitField datum-flags captured-name field-sig nil nil)
(.visitEnd))
(->> (let [captured-name (str &&/closure-prefix ?captured-id)])
(|case ?name+?captured
[?name [_ (&o/$captured _ ?captured-id ?source)]])
(doseq [?name+?captured (&/->seq ?env)])))
(-> (.visitField datum-flags (str &&/partial-prefix idx) field-sig nil nil)
(doto (.visitEnd))
(->> (dotimes [idx (dec arity)])))
(-> (.visitSource file-name nil)
(when save?))
(add-function-<init> class-name arity ?env)
(add-function-reset class-name arity ?env)
)]
_ (if (> arity 1)
(add-function-impl =class class-name compile arity ?body)
(return nil))
_ (&/map% #(add-function-apply-n =class % class-name arity ?env compile ?body)
(&/|range* 1 (min arity &&/num-apply-variants)))
:let [_ (.visitEnd =class)]
_ (if save?
(&&/save-class! name (.toByteArray =class))
(return nil))]
(if save?
(instance-closure compile class-name arity ?env)
(return (instance-closure compile class-name arity ?env))))))
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