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|
(ns lang.compiler
(:refer-clojure :exclude [compile])
(:require [clojure.string :as string]
[clojure.core.match :refer [match]]
[lang.parser :as &parser]
:reload)
(:import (org.objectweb.asm Opcodes
Label
ClassWriter
MethodVisitor)))
(declare compile-form)
;; [Utils/General]
(defmacro ^:private defcompiler [name match body]
`(defn ~name [~'*writer* ~'*form*]
(match ~'*form*
~match
(do ~body
true)
_#
false)))
(defn ^:private unwrap-ident [ident]
(match ident
[::&parser/ident ?label]
?label))
(defn ^:private unwrap-tagged [ident]
(match ident
[::&parser/tagged ?tag ?data]
[?tag ?data]))
(defn ^:private ->class [class]
(string/replace class #"\." "/"))
(defn ^:private ->type-signature [class]
(case class
"Void" "V"
;; else
(str "L" (->class class) ";")))
;; [Utils/Compilers]
(defcompiler ^:private compile-boolean
[::&parser/boolean ?boolean]
(if ?boolean
(.visitLdcInsn *writer* (int 1))
(.visitLdcInsn *writer* (int 0))))
(defcompiler ^:private compile-string
[::&parser/string ?string]
(.visitLdcInsn *writer* ?string))
(defcompiler ^:private compile-ident
[::&parser/ident ?name]
(doto *writer*
(.visitVarInsn Opcodes/ALOAD (int 0))))
(defcompiler ^:private compile-fn-call
[::&parser/fn-call [::&parser/ident ?fn] ?args]
(do (doseq [arg ?args]
(compile-form *writer* arg))
(doto *writer*
(.visitMethodInsn Opcodes/INVOKESTATIC "output" ?fn "(Ljava/lang/Object;)Ljava/lang/Object;"))))
(defcompiler ^:private compile-static-access
[::&parser/static-access ?class ?member]
(doto *writer*
(.visitFieldInsn Opcodes/GETSTATIC (->class ?class) ?member (->type-signature "java.io.PrintStream"))))
(defcompiler ^:private compile-dynamic-access
[::&parser/dynamic-access ?object ?access]
(let [=object (compile-form *writer* ?object)
method (match ?access
[::&parser/fn-call [::&parser/ident ?method] ?args]
(do (doseq [arg ?args]
(compile-form *writer* arg))
?method))]
(doto *writer*
(.visitMethodInsn Opcodes/INVOKEVIRTUAL (->class "java.io.PrintStream") method "(Ljava/lang/String;)V"))))
(defcompiler ^:private compile-ann-class
[::&parser/ann-class ?class ?members]
nil)
(defcompiler ^:private compile-if
[::&parser/if ?test ?then ?else]
(let [else-label (new Label)
end-label (new Label)]
(compile-form *writer* ?test)
(.visitJumpInsn *writer* Opcodes/IFEQ else-label)
(compile-form *writer* ?then)
(doto *writer*
(.visitJumpInsn Opcodes/GOTO end-label)
(.visitLabel else-label))
(compile-form *writer* ?else)
(.visitLabel *writer* end-label)))
(defcompiler ^:private compile-def
[::&parser/def ?form ?body]
(match ?form
[::&parser/fn-call [::&parser/ident ?name] ?args]
(if (= "main" ?name)
(let [=method (doto (.visitMethod *writer* (+ Opcodes/ACC_PUBLIC Opcodes/ACC_STATIC) ?name "([Ljava/lang/String;)V" nil nil)
(.visitCode))]
(compile-form =method ?body)
(doto =method
(.visitInsn Opcodes/RETURN)
(.visitMaxs 0 0)
(.visitEnd)))
(let [=method (doto (.visitMethod *writer* (+ Opcodes/ACC_PUBLIC Opcodes/ACC_STATIC) ?name "(Ljava/lang/Object;)Ljava/lang/Object;" nil nil)
(.visitCode))]
;; (doto =method
;; (.visitFieldInsn Opcodes/GETSTATIC (->class "java.lang.System") "out" (->type-signature "java.io.PrintStream"))
;; (.visitLdcInsn "IN")
;; (.visitMethodInsn Opcodes/INVOKEVIRTUAL (->class "java.io.PrintStream") "println" "(Ljava/lang/String;)V"))
(compile-form =method ?body)
;; (doto =method
;; (.visitFieldInsn Opcodes/GETSTATIC (->class "java.lang.System") "out" (->type-signature "java.io.PrintStream"))
;; (.visitLdcInsn "OUT")
;; (.visitMethodInsn Opcodes/INVOKEVIRTUAL (->class "java.io.PrintStream") "println" "(Ljava/lang/String;)V"))
(doto =method
(.visitInsn Opcodes/ARETURN)
(.visitMaxs 0 0)
(.visitEnd))))
))
(let [+compilers+ [compile-boolean
compile-string
compile-ident
compile-fn-call
compile-static-access
compile-dynamic-access
compile-ann-class
compile-if
compile-def]]
(defn ^:private compile-form [writer form]
(prn 'compile-form/form form)
(some #(% writer form) +compilers+)))
;; [Interface]
(defn compile [inputs]
(prn 'inputs inputs)
(let [=class (doto (new ClassWriter ClassWriter/COMPUTE_MAXS)
(.visit Opcodes/V1_5 (+ Opcodes/ACC_PUBLIC Opcodes/ACC_SUPER)
"output" nil "java/lang/Object" nil))]
(doto (.visitMethod =class Opcodes/ACC_PUBLIC "<init>" "()V" nil nil)
(.visitCode)
(.visitVarInsn Opcodes/ALOAD 0)
(.visitMethodInsn Opcodes/INVOKESPECIAL "java/lang/Object" "<init>" "()V")
(.visitInsn Opcodes/RETURN)
(.visitMaxs 0 0)
(.visitEnd))
(doall (map (partial compile-form =class) inputs))
(.visitEnd =class)
(.toByteArray =class)))
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