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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.host
(:require (clojure [string :as string]
[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]))
(:import (java.lang.reflect Field Method Constructor Modifier)
java.util.regex.Pattern
(org.objectweb.asm Opcodes
Label
ClassWriter
MethodVisitor)))
;; [Constants]
(def prefix "lux.")
(def function-class (str prefix "Function"))
(def module-separator "/")
(def class-name-separator ".")
(def class-separator "/")
(def array-data-tag "#Array")
(def null-data-tag "#Null")
;; [Utils]
(def class-name-re #"((\[+)L([\.a-zA-Z0-9]+);|([\.a-zA-Z0-9]+))")
(comment
(let [class (class (to-array []))]
(str (if-let [pkg (.getPackage class)]
(str (.getName pkg) ".")
"")
(.getSimpleName class)))
(.getName String) "java.lang.String"
(.getName (class (to-array []))) "[Ljava.lang.Object;"
(re-find class-name-re "java.lang.String")
["java.lang.String" "java.lang.String" nil nil "java.lang.String"]
(re-find class-name-re "[Ljava.lang.Object;")
["[Ljava.lang.Object;" "[Ljava.lang.Object;" "[" "java.lang.Object" nil]
)
(defn ^:private class->type [^Class class]
"(-> Class Type)"
(do ;; (prn 'class->type/_0 class (.getSimpleName class) (.getName class))
(if-let [[_ _ arr-brackets arr-base simple-base] (re-find class-name-re (.getName class))]
(let [base (or arr-base simple-base)]
;; (prn 'class->type/_1 class base arr-brackets)
(let [output-type (if (.equals "void" base)
&type/Unit
(reduce (fn [inner _] (&type/Data$ array-data-tag (&/|list inner)))
(&type/Data$ base &/Nil$)
(range (count (or arr-brackets ""))))
)]
;; (prn 'class->type/_2 class (&type/show-type output-type))
output-type)
))))
(defn ^:private method->type [^Method method]
"(-> Method Type)"
(class->type (.getReturnType method)))
;; [Resources]
(do-template [<name> <old-sep> <new-sep>]
(let [regex (-> <old-sep> Pattern/quote re-pattern)]
(defn <name> [old]
(string/replace old regex <new-sep>)))
^String ->class class-name-separator class-separator
^String ->class-name module-separator class-name-separator
^String ->module-class module-separator class-separator
)
(def ->package ->module-class)
(defn ->type-signature [class]
;; (assert (string? class))
(case class
"void" "V"
"boolean" "Z"
"byte" "B"
"short" "S"
"int" "I"
"long" "J"
"float" "F"
"double" "D"
"char" "C"
;; else
(let [class* (->class class)]
(if (.startsWith class* "[")
class*
(str "L" class* ";")))
))
(defn unfold-array [type]
"(-> Type (, Int Type))"
(|case type
(&/$DataT "#Array" (&/$Cons param (&/$Nil)))
(|let [[count inner] (unfold-array param)]
(&/T (inc count) inner))
_
(&/T 0 type)))
(defn ->java-sig [^objects type]
"(-> Type Text)"
(|case type
(&/$DataT ?name params)
(cond (= array-data-tag ?name) (|let [[level base] (unfold-array type)
base-sig (|case base
(&/$DataT base-class _)
(->class base-class)
_
(->java-sig base))]
(str (->> (&/|repeat level "[") (&/fold str ""))
"L" base-sig ";"))
(= null-data-tag ?name) (->type-signature "java.lang.Object")
:else (->type-signature ?name))
(&/$LambdaT _ _)
(->type-signature function-class)
(&/$TupleT (&/$Nil))
"V"
(&/$NamedT ?name ?type)
(->java-sig ?type)
_
(assert false (str '->java-sig " " (&type/show-type type)))
))
(do-template [<name> <static?>]
(defn <name> [class-loader target field]
(if-let [type* (first (for [^Field =field (.getDeclaredFields (Class/forName (&type/as-obj target) true class-loader))
:when (and (.equals ^Object field (.getName =field))
(.equals ^Object <static?> (Modifier/isStatic (.getModifiers =field))))]
(.getType =field)))]
(return (class->type type*))
(fail (str "[Host Error] Field does not exist: " target "." field))))
lookup-static-field true
lookup-field false
)
(do-template [<name> <static?>]
(defn <name> [class-loader target method-name args]
;; (prn '<name> target method-name)
(if-let [method (first (for [^Method =method (.getDeclaredMethods (Class/forName (&type/as-obj target) true class-loader))
:when (and (.equals ^Object method-name (.getName =method))
(.equals ^Object <static?> (Modifier/isStatic (.getModifiers =method)))
(let [param-types (&/->list (seq (.getParameterTypes =method)))]
(and (= (&/|length args) (&/|length param-types))
(&/fold2 #(and %1 (.equals ^Object %2 %3))
true
args
(&/|map #(.getName ^Class %) param-types)))))]
=method))]
(return (&/T (method->type method) (->> method .getExceptionTypes &/->list (&/|map #(.getName %)))))
(fail (str "[Host Error] Method does not exist: " target "." method-name))))
lookup-static-method true
lookup-virtual-method false
)
(defn lookup-constructor [class-loader target args]
;; (prn 'lookup-constructor class-loader target (&type/as-obj target))
(if-let [ctor (first (for [^Constructor =method (.getDeclaredConstructors (Class/forName (&type/as-obj target) true class-loader))
:when (let [param-types (&/->list (seq (.getParameterTypes =method)))]
(and (= (&/|length args) (&/|length param-types))
(&/fold2 #(and %1 (.equals ^Object %2 %3))
true
args
(&/|map #(.getName ^Class %) param-types))))]
=method))]
(return (&/T &type/Unit (->> ctor .getExceptionTypes &/->list (&/|map #(.getName %)))))
(fail (str "[Host Error] Constructor does not exist: " target))))
(defn abstract-methods [class-loader class]
(return (&/->list (for [^Method =method (.getDeclaredMethods (Class/forName (&type/as-obj class) true class-loader))
:when (.equals true (Modifier/isAbstract (.getModifiers =method)))]
(&/T (.getName =method) (&/|map #(.getName ^Class %) (&/->list (seq (.getParameterTypes =method)))))))))
(defn location [scope]
(->> scope (&/|map &/normalize-name) (&/|interpose "$") (&/fold str "")))
(defn modifiers->int [mods]
(+ (case (:visibility mods)
"default" 0
"public" Opcodes/ACC_PUBLIC
"private" Opcodes/ACC_PRIVATE
"protected" Opcodes/ACC_PROTECTED)
(if (:static? mods) Opcodes/ACC_STATIC 0)
(if (:final? mods) Opcodes/ACC_FINAL 0)
(if (:abstract? mods) Opcodes/ACC_ABSTRACT 0)
(case (:concurrency mods)
"synchronized" Opcodes/ACC_SYNCHRONIZED
"volatile" Opcodes/ACC_VOLATILE
;; else
0)))
(let [object-real-class (->class "java.lang.Object")]
(defn ^:private dummy-return [writer name output]
(case output
"void" (if (= "<init>" name)
(doto writer
(.visitVarInsn Opcodes/ALOAD 0)
(.visitMethodInsn Opcodes/INVOKESPECIAL object-real-class "<init>" "()V")
(.visitInsn Opcodes/RETURN))
(.visitInsn writer Opcodes/RETURN))
"boolean" (doto writer
(.visitLdcInsn false)
(.visitInsn Opcodes/IRETURN))
"byte" (doto writer
(.visitLdcInsn (byte 0))
(.visitInsn Opcodes/IRETURN))
"short" (doto writer
(.visitLdcInsn (short 0))
(.visitInsn Opcodes/IRETURN))
"int" (doto writer
(.visitLdcInsn (int 0))
(.visitInsn Opcodes/IRETURN))
"long" (doto writer
(.visitLdcInsn (long 0))
(.visitInsn Opcodes/LRETURN))
"float" (doto writer
(.visitLdcInsn (float 0.0))
(.visitInsn Opcodes/FRETURN))
"double" (doto writer
(.visitLdcInsn (double 0.0))
(.visitInsn Opcodes/DRETURN))
"char" (doto writer
(.visitLdcInsn (char 0))
(.visitInsn Opcodes/IRETURN))
;; else
(doto writer
(.visitInsn Opcodes/ACONST_NULL)
(.visitInsn Opcodes/ARETURN)))))
(defn use-dummy-class [name super-class interfaces fields methods]
(|do [module &/get-module-name
:let [full-name (str module "/" name)
=class (doto (new ClassWriter ClassWriter/COMPUTE_MAXS)
(.visit Opcodes/V1_5 (+ Opcodes/ACC_PUBLIC Opcodes/ACC_SUPER)
full-name nil (->class super-class) (->> interfaces (&/|map ->class) &/->seq (into-array String))))
_ (&/|map (fn [field]
(doto (.visitField =class (modifiers->int (:modifiers field)) (:name field)
(->type-signature (:type field)) nil nil)
(.visitEnd)))
fields)
_ (&/|map (fn [method]
(|let [signature (str "(" (&/fold str "" (&/|map ->type-signature (:inputs method))) ")"
(->type-signature (:output method)))]
(doto (.visitMethod =class (modifiers->int (:modifiers method))
(:name method)
signature
nil
(->> (:exceptions method) (&/|map ->class) &/->seq (into-array java.lang.String)))
.visitCode
(dummy-return (:name method) (:output method))
(.visitMaxs 0 0)
(.visitEnd))))
methods)
bytecode (.toByteArray (doto =class .visitEnd))]
loader &/loader
!classes &/classes
:let [real-name (str (->class-name module) "." name)
_ (swap! !classes assoc real-name bytecode)
_ (.loadClass loader real-name)]]
(return nil)))
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