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; 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.
(in-ns 'clojure)
(import
'(clojure.asm ClassWriter ClassVisitor Opcodes Type)
'(java.lang.reflect Modifier Constructor)
'(clojure.asm.commons Method GeneratorAdapter)
'(clojure.lang IProxy Reflector DynamicClassLoader IPersistentMap PersistentHashMap))
(def *proxy-classes* (ref {}))
(defn get-proxy-class
"Takes an optional single class followed by zero or more
interfaces. If not supplied class defaults to Object. Creates an
returns an instance of a proxy class derived from the supplied
classes. The resulting value is cached and used for any subsequent
requests for the same class set. Returns a Class object."
[& bases]
(let [bases (if (. (first bases) (isInterface))
(cons Object bases)
bases)
[super & interfaces] bases]
(or (get @*proxy-classes* bases)
(let [cv (new ClassWriter (. ClassWriter COMPUTE_MAXS))
cname (str "clojure/lang/" (gensym "Proxy__"))
ctype (. Type (getObjectType cname))
iname (fn [c] (.. Type (getType c) (getInternalName)))
fmap "__clojureFnMap"
totype (fn [c] (. Type (getType c)))
to-types (fn [cs] (if (pos? (count cs))
(into-array (map totype cs))
(make-array Type 0)))
super-type (totype super)
map-type (totype PersistentHashMap)
ifn-type (totype clojure.lang.IFn)
obj-type (totype Object)
sym-type (totype clojure.lang.Symbol)
rt-type (totype clojure.lang.RT)
ex-type (totype java.lang.UnsupportedOperationException)
gen-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))
(. gen (loadThis))
(. gen (getField ctype fmap map-type))
;get symbol corresponding to name
(. gen (push (. meth (getName))))
(. gen (invokeStatic sym-type (. Method (getMethod "clojure.lang.Symbol create(String)"))))
;lookup fn in map
(. gen (invokeStatic rt-type (. Method (getMethod "Object get(Object, Object)"))))
(. 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)
(into-array (map iname (cons IProxy interfaces)))))
;add field for fn mappings
(. cv (visitField (+ (. Opcodes ACC_PRIVATE) (. Opcodes ACC_VOLATILE))
fmap (. map-type (getDescriptor)) nil nil))
;add ctors matching/calling super's
(doseq #^Constructor ctor (. super (getDeclaredConstructors))
(when-not (. Modifier (isPrivate (. ctor (getModifiers))))
(let [ptypes (to-types (. ctor (getParameterTypes)))
m (new Method "<init>" (. Type VOID_TYPE) ptypes)
gen (new GeneratorAdapter (. Opcodes ACC_PUBLIC) m nil nil cv)]
(. gen (visitCode))
;call super ctor
(. gen (loadThis))
(. gen (dup))
(. gen (loadArgs))
(. gen (invokeConstructor super-type m))
;init fmap
(. gen (getStatic map-type "EMPTY" map-type))
(. gen (putField ctype fmap map-type))
(. gen (returnValue))
(. gen (endMethod)))))
;add IProxy methods
(let [m (. Method (getMethod "void __updateClojureFnMappings(clojure.lang.IPersistentMap)"))
gen (new GeneratorAdapter (. Opcodes ACC_PUBLIC) m nil nil cv)]
(. gen (visitCode))
(. gen (loadThis))
(. gen (dup))
(. gen (getField ctype fmap map-type))
(. gen (loadArgs))
(. gen (invokeInterface (totype clojure.lang.IPersistentCollection)
(. Method (getMethod "clojure.lang.IPersistentCollection cons(Object)"))))
(. gen (checkCast map-type))
(. gen (putField ctype fmap map-type))
(. gen (returnValue))
(. gen (endMethod)))
(let [m (. Method (getMethod "clojure.lang.IPersistentMap __getClojureFnMappings()"))
gen (new GeneratorAdapter (. Opcodes ACC_PUBLIC) m nil nil cv)]
(. gen (visitCode))
(. gen (loadThis))
(. gen (getField ctype fmap map-type))
(. gen (returnValue))
(. gen (endMethod)))
;calc set of supers' non-private instance methods
(let [mm (loop [mm {} c super]
(if c
(recur
(loop [mm mm meths (concat
(seq (. c (getDeclaredMethods)))
(seq (. c (getMethods))))]
(if meths
(let [#^java.lang.reflect.Method meth (first meths)
mods (. meth (getModifiers))
mk [(. meth (getName)) (seq (. meth (getParameterTypes)))]]
(if (or (contains? mm mk)
(. Modifier (isPrivate mods))
(. Modifier (isStatic mods))
(. Modifier (isFinal mods)))
(recur mm (rest meths))
(recur (assoc mm mk meth) (rest meths))))
mm))
(. c (getSuperclass)))
mm))]
;add methods matching supers', if no mapping -> call super
(doseq #^java.lang.reflect.Method meth (vals mm)
(gen-method meth
(fn [gen m]
(. gen (loadThis))
;push args
(. gen (loadArgs))
;call super
(. gen (visitMethodInsn (. Opcodes INVOKESPECIAL)
(. super-type (getInternalName))
(. m (getName))
(. m (getDescriptor)))))))
;add methods matching interfaces', if no mapping -> throw
(doseq #^Class iface interfaces
(doseq #^java.lang.reflect.Method meth (. iface (getMethods))
(gen-method meth
(fn [gen m]
(. gen (throwException ex-type (. m (getName)))))))))
;finish class def
(. cv (visitEnd))
;generate, cache and return class object
(let [loader (new DynamicClassLoader)
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