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util.clj
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util.clj
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;; Copyright (c) Juha Arpiainen. All rights reserved.
;; The use and distribution terms for this software are covered by the
;; Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
;; which can be found in the file epl-v10.html 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 'org.subluminal.compiler)
;;;; Manipulating lexical context
(defn current-method [ctx]
[(get (:index ctx) (:method ctx)) ctx])
(defn update-current-method [f & args]
(fn [ctx]
[nil (apply update-in ctx [:index (:method ctx)] f args)]))
(defn current-object [ctx]
[(get (:index ctx) (:fn ctx)) ctx])
(defn push-frame []
(fn [ctx]
[nil (assoc ctx :parent ctx)]))
(defn pop-frame [ctx]
[nil (assoc (:parent ctx)
:binding-sites (:binding-sites ctx)
:index (:index ctx))])
(defn push-clear-node [kind root?]
(fn [ctx]
(let [tag (gensym "NN")]
[nil
(assoc ctx
:parent ctx
:clear-tag tag
:clear-path ctx
:clear-kind kind
:clear-root (if root? tag (:clear-root ctx)))])))
;;;; Namespace lookup
(defn namespace-for
([sym] (namespace-for *ns* sym))
([inns sym]
(let [nssym (symbol (namespace sym))
n (or (get (ns-aliases inns) nssym)
(find-ns nssym))]
n)))
;; used in (def sym ...) and (var sym)
(defn lookup-var [rel-ns sym intern?]
(cond
(namespace sym)
(let [ns-part (symbol (namespace sym))
name-part (symbol (name sym))
ns-for (or (.lookupAlias rel-ns ns-part)
(Namespace/find ns-part))]
(when ns-for
(if (and intern? (= ns-for rel-ns))
(intern ns-for name-part))
(.findInternedVar ns-for name-part)))
(= sym 'ns)
#'clojure.core/ns
(= sym 'in-ns)
#'clojure.core/in-ns
:else
(let [o (.getMapping rel-ns sym)]
(if o
(if (instance? Var o)
o
(throw (Exception. (str "Expecting var, but sym: " sym
" is mapped to " o))))
(when intern?
(intern rel-ns sym))))))
(defn the-macro [nss sym env]
(cond
;; local macros...
(and (symbol? sym) (contains? env sym))
nil
(or (symbol? sym) (var? sym))
(let [^Var v (if (var? sym)
sym
(lookup-var nss sym false))]
(when (and v (.isMacro v))
(if (or (= (.ns v) nss)
(.isPublic v))
v
(throw (IllegalStateException.
(str "var: " v " is not public"))))))))
(defn names-static-member? [nss ^Symbol sym]
(and (namespace sym)
(not (namespace-for nss sym))))
(defn file->class-name [^String f]
(symbol (str (-> f
(.replace java.io.File/separator ".")
(.substring 0 (.lastIndexOf f (int \.))))
RT/LOADER_SUFFIX)))
(def +char-map+
{\- "_"
\: "_COLON_"
\+ "_PLUS_"
\> "_GT_"
\< "_LT_"
\= "_EQ_"
\~ "_TILDE_"
\! "_BANG_"
\@ "_CIRCA_"
\# "_SHARP_"
\$ "_DOLLARSIGN_"
\% "_PERCENT_"
\^ "_CARET_"
\& "_AMPERSAND_"
\* "_STAR_"
\| "_BAR_"
\{ "_LBRACE_"
\} "_RBRACE_"
\[ "_LBRACK_"
\] "_RBRACK_"
\/ "_SLASH_"
\\ "_BSLASH_"
\? "_QMARK_"})
(defn munge-impl
"Convert the name of a Clojure symbol into a valid Java identifier"
[s]
(apply str (map #(get +char-map+ % %) s)))
;;;; Resolve :tag metadata to a class
(defn maybe-class
[^Namespace nss tag string-ok?]
(cond
(class? tag) tag
(and (symbol? tag) (not (namespace tag)))
(cond
; (= tag *compile-stub-sym*)
; *compile-stub-class*
(or (> (.indexOf (name tag) (int \.)) 0)
(= (.charAt (name tag) 0) (int \[)))
(RT/classForName (name tag))
:else
(try
(let [c (.getMapping nss tag)]
(if (class? c) c
(RT/classForName (name tag))))
(catch ClassNotFoundException e
nil)))
(and string-ok? (string? tag))
(RT/classForName ^String tag)))
(def ^{:private true} prim-class
{'int Integer/TYPE
'long Long/TYPE
'double Double/TYPE
'float Float/TYPE
'char Character/TYPE
'short Short/TYPE
'byte Byte/TYPE
'boolean Boolean/TYPE
'void Void/TYPE })
(def ^{:private true} array-tags
{'objects (class (make-array Object 0))
'ints (class (int-array 0))
'longs (class (long-array 0))
'floats (class (float-array 0))
'doubles (class (double-array 0))
'bytes (class (byte-array 0))
'shorts (class (short-array 0))
'chars (class (char-array 0))
'booleans (class (boolean-array 0))})
(defn- tag-to-class [nss tag]
(if-let [c (array-tags tag)] c
(if-let [c (maybe-class nss tag true)] c
(throw (IllegalArgumentException.
(str "Unable to resolve classname: " tag))))))
(defn tag-class
"Try to interpret the :tag metadata of an object as a Class"
[nss tag]
(if (nil? tag)
nil
(if-let [c (prim-class tag)]
c
(tag-to-class nss tag))))
(defn tag-of
"Returns the :tag metadata of an object as a symbol"
[thing]
(let [tag (:tag (meta thing))]
(cond
(symbol? tag)
tag
(string? tag)
(symbol tag)
:else nil)))
;;;; Macro expansion
;; macroexpand exists in clojure.core
;; but just delegates to clojure.lang.Compiler
(def +specials+
#{'if 'let* 'loop* 'fn* 'recur 'quote
'var 'def 'monitor-enter 'monitor-exit
'throw 'try 'catch 'finally 'new '.
'clojure.core/import*
;; TODO:
'case* 'letfn* 'set! 'deftype* 'reify* '&})
(defn macroexpand1-impl
[nss env form]
(if-not (seq? form)
form
(let [op (first form)]
(if (contains? +specials+ op)
form
(if-let [v (the-macro nss op env)]
(apply v form env (next form))
(if-not (symbol? op)
form
(let [^String sname (name op)]
;; For some reason accepts symbols with arbitrary ns part
(cond
(= (.charAt sname 0) \.)
(if-not (next form)
(throw (IllegalArgumentException.
(str "Malformed member expression: " form
", expecting (.member target ...)")))
(let [member (symbol (.substring sname 1))
target (second form)
target (if (maybe-class nss target false)
(with-meta
`(identity ~target)
{:tag 'java.lang.Class})
target)]
(with-meta
`(~'. ~target ~member ~@(nnext form))
(meta form))))
(names-static-member? nss op)
(let [target (symbol (namespace op))
member (symbol (name op))
c (maybe-class nss target false)]
(if-not c form
(with-meta
`(~'. ~target ~member ~@(next form))
(meta form))))
(.endsWith sname ".")
(with-meta
`(~'new ~(symbol (.substring sname 0 (dec (count sname))))
~@(next form))
(meta form))
:else form))))))))
(def *macroexpand-limit* 100)
(defn macroexpand-impl
[nss form]
(run [env (fetch-val :lexicals)]
(loop [f form n 0]
(let [fx (macroexpand1-impl nss env f)]
(if (identical? f fx)
f
(if (and *macroexpand-limit* (>= n *macroexpand-limit*))
(throw (Exception. (str "Runaway macroexpansion: " form)))
(recur fx (inc n))))))))
;;;; Arg type matching
(defn subsumes [^"[Ljava.lang.Class;" left
^"[Ljava.lang.Class;" right]
(areduce left i ret false
(let [^Class l (aget left i) ^Class r (aget right i)]
(cond
(nil? ret) nil
(= l r) ret
(or (and (not (.isPrimitive l))
(.isPrimitive r))
(.isAssignableFrom r l))
true
:else nil))))
;; TODO: define a protocol for Methods and Constructors
;; and merge these two fns:
(defn matching-method
[args ctors]
(let [args (vec args)]
(loop [^Method best nil tied? false found-exact? false ctors ctors]
(if (nil? ctors)
(if tied?
(throw (IllegalArgumentException.
"More than one matching method found"))
best)
(let [^Method curr (first ctors)
curr-types (.getParameterTypes curr)
[exacts match?]
(areduce
curr-types i r [0 true]
(let [[exact match] r
parm (aget curr-types i)
arg (args i)]
(if (= parm arg)
[(inc exact) match]
[exact (Reflector/paramArgTypeMatch parm arg)])))]
(cond
(== exacts (count args))
(recur
(if (or (not found-exact?)
(not best)
(.isAssignableFrom (.getReturnType best)
(.getReturnType curr)))
curr best)
tied? true (next ctors))
(and match? (not found-exact?))
(cond
(nil? best)
(recur curr tied? found-exact? (next ctors))
(subsumes curr-types
(.getParameterTypes best))
(recur curr false found-exact? (next ctors))
(Arrays/equals curr-types
(.getParameterTypes best))
(recur
(if (.isAssignableFrom (.getReturnType best)
(.getReturnType curr))
curr best)
tied? found-exact? (next ctors))
(not (subsumes (.getParameterTypes best)
curr-types))
(recur best true found-exact? (next ctors))
:else
(recur best tied? found-exact? (next ctors)))
:else (recur best tied? found-exact? (next ctors))))))))
(defn matching-constructor
[args ctors]
(let [args (vec args)]
(loop [^Constructor best nil tied? false found-exact? false ctors ctors]
(if (nil? ctors)
(if tied?
(throw (IllegalArgumentException.
"More than one matching constructor found"))
best)
(let [^Constructor curr (first ctors)
curr-types (.getParameterTypes curr)
[exacts match?]
(areduce
curr-types i r [0 true]
(let [[exact match] r
parm (aget curr-types i)
arg (args i)]
(if (= parm arg)
[(inc exact) match]
[exact (Reflector/paramArgTypeMatch parm arg)])))]
(cond
(== exacts (count args))
(recur
(if (not found-exact?) curr best)
tied? true (next ctors))
(and match? (not found-exact?))
(cond
(nil? best)
(recur curr tied? found-exact? (next ctors))
(subsumes curr-types
(.getParameterTypes best))
(recur curr false found-exact? (next ctors))
(Arrays/equals curr-types
(.getParameterTypes best))
(recur curr tied? found-exact? (next ctors))
(not (subsumes (.getParameterTypes best)
curr-types))
(recur best true found-exact? (next ctors))
:else
(recur best tied? found-exact? (next ctors)))
:else (recur best tied? found-exact? (next ctors))))))))