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; Copyright (c) Rich Hickey. All rights reserved.
; The use and distribution terms for this software are covered by the
; Common Public License 1.0 (http://opensource.org/licenses/cpl.php)
; which can be found in the file CPL.TXT at the root of this distribution.
; By using this software in any fashion, you are agreeing to be bound by
; the terms of this license.
; You must not remove this notice, or any other, from this software.
(import '(java.lang.reflect Modifier Constructor)
'(clojure.asm ClassWriter ClassVisitor Opcodes Type)
'(clojure.asm.commons Method GeneratorAdapter)
'(clojure.lang IPersistentMap))
(defn method-sig [#^java.lang.reflect.Method meth]
[(. meth (getName)) (seq (. meth (getParameterTypes)))])
(defn non-private-methods [#^Class c]
(loop [mm {}
considered #{}
c c]
(if c
(let [[mm considered]
(loop [mm mm
considered considered
meths (concat
(seq (. c (getDeclaredMethods)))
(seq (. c (getMethods))))]
(if meths
(let [#^Method meth (first meths)
mods (. meth (getModifiers))
mk (method-sig meth)]
(if (or (considered mk)
(. Modifier (isPrivate mods))
(. Modifier (isStatic mods))
(. Modifier (isFinal mods)))
(recur mm (conj considered mk) (rest meths))
(recur (assoc mm mk meth) (conj considered mk) (rest meths))))
[mm considered]))]
(recur mm considered (. c (getSuperclass))))
mm)))
(defn ctor-sigs [super]
(for [#^Constructor ctor (. super (getDeclaredConstructors))
:when (not (. Modifier (isPrivate (. ctor (getModifiers)))))]
(apply vector (. ctor (getParameterTypes)))))
(distinct (map first(keys (mapcat non-private-methods [Object IPersistentMap]))))
(defn gen-class
([name [super & interfaces :as supers]]
(gen-class name supers (zipmap (ctor-sigs super) (ctor-sigs super))))
([name [super & interfaces :as supers] ctor-sig-map]
(let [cv (new ClassWriter (. ClassWriter COMPUTE_MAXS))
cname (. name (replace "." "/"))
ctype (. Type (getObjectType cname))
iname (fn [c] (.. Type (getType c) (getInternalName)))
totype (fn [c] (. Type (getType c)))
to-types (fn [cs] (if (pos? (count cs))
(into-array (map totype cs))
(make-array Type 0)))
obj-type (totype Object)
arg-types (fn [n] (if (pos? n)
(into-array (replicate n obj-type))
(make-array Type 0)))
super-type (totype super)
init-name "__init"
factory-name "__create"
state-name "__state"
main-name "main"
var-name (fn [s] (str s "__var"))
rt-type (totype clojure.lang.RT)
var-type (totype clojure.lang.Var)
ifn-type (totype clojure.lang.IFn)
ex-type (totype java.lang.UnsupportedOperationException)
var-fields (list* init-name factory-name main-name
(distinct (map first (keys (mapcat non-private-methods supers)))))
emit-get-var (fn [gen v]
(let [false-label (. gen newLabel)
end-label (. gen newLabel)]
(. gen getStatic ctype (var-name v) var-type)
(. gen invokeVirtual var-type (. Method (getMethod "boolean isBound()")))
(. gen ifZCmp (GeneratorAdapter.EQ) false-label)
(. gen getStatic ctype (var-name v) var-type)
(. gen goTo end-label)
(. gen mark false-label)
(. gen visitInsn (Opcodes.ACONST_NULL))
(. gen mark end-label)))
emit-forwarding-method
(fn [#^java.lang.reflect.Method meth else-gen]
(let [pclasses (. meth (getParameterTypes))
ptypes (to-types pclasses)
rtype (totype (. meth (getReturnType)))
m (new Method (. meth (getName)) rtype ptypes)
gen (new GeneratorAdapter (. Opcodes ACC_PUBLIC) m nil nil cv)
else-label (. gen (newLabel))
end-label (. gen (newLabel))
decl-type (. Type (getType (. meth (getDeclaringClass))))]
(. gen (visitCode))
(emit-get-var gen (. meth (getName)))
(. gen (dup))
(. gen (ifNull else-label))
;if found
(. gen (loadThis))
;box args
(dotimes i (count ptypes)
(. gen (loadArg i))
(. clojure.lang.Compiler$HostExpr (emitBoxReturn nil gen (nth pclasses i))))
;call fn
(. gen (invokeInterface ifn-type (new Method "invoke" obj-type
(into-array (cons obj-type
(replicate (count ptypes) obj-type))))))
;unbox return
(. gen (unbox rtype))
(when (= (. rtype (getSort)) (. Type VOID))
(. gen (pop)))
(. gen (goTo end-label))
;else call supplied alternative generator
(. gen (mark else-label))
(. gen (pop))
(else-gen gen m)
(. gen (mark end-label))
(. gen (returnValue))
(. gen (endMethod))))
]
;start class definition
(. cv (visit (. Opcodes V1_5) (. Opcodes ACC_PUBLIC)
cname nil (iname super)
(when interfaces
(into-array (map iname interfaces)))))
;static fields for vars
(doseq v var-fields
(. cv (visitField (+ (Opcodes.ACC_PUBLIC) (Opcodes.ACC_FINAL) (Opcodes.ACC_STATIC))
(var-name v)
(. var-type getDescriptor)
nil nil)))
;instance field for state
(. cv (visitField (+ (Opcodes.ACC_PUBLIC) (Opcodes.ACC_FINAL))
state-name
(. obj-type getDescriptor)
nil nil))
;static init to set up var fields
(let [gen (new GeneratorAdapter (+ (Opcodes.ACC_PUBLIC) (Opcodes.ACC_STATIC))
(Method.getMethod "void <clinit> ()")
nil nil cv)]
(. gen (visitCode))
(doseq v var-fields
(. gen push name)
(. gen push v)
(. gen (invokeStatic rt-type (. Method (getMethod "clojure.lang.Var var(String,String)"))))
(. gen putStatic ctype (var-name v) var-type))
(. gen (returnValue))
(. gen (endMethod)))
;ctors
(doseq [pclasses super-pclasses] ctor-sig-map
(let [ptypes (to-types pclasses)
super-ptypes (to-types super-pclasses)
m (new Method "<init>" (. Type VOID_TYPE) ptypes)
super-m (new Method "<init>" (. Type VOID_TYPE) super-ptypes)
gen (new GeneratorAdapter (. Opcodes ACC_PUBLIC) m nil nil cv)
no-init-label (. gen newLabel)
end-label (. gen newLabel)
nth-method (. Method (getMethod "Object nth(Object,int)"))
local (. gen newLocal obj-type)]
(. gen (visitCode))
(emit-get-var gen init-name)
(. gen dup)
(. gen ifNull no-init-label)
;box init args
(dotimes i (count pclasses)
(. gen (loadArg i))
(. clojure.lang.Compiler$HostExpr (emitBoxReturn nil gen (nth pclasses i))))
;call init fn
(. gen (invokeInterface ifn-type (new Method "invoke" obj-type
(arg-types (count ptypes)))))
;expecting [[super-ctor-args] state] returned
(. gen dup)
(. gen push 0)
(. gen (invokeStatic rt-type nth-method))
(. gen storeLocal local)
(. gen (loadThis))
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