X-Git-Url: https://git.saurik.com/cycript.git/blobdiff_plain/477549f502f5350425ab6547564852bcfd6940ae..88c31c1e00d8a528f46aabe2e4886a78c8eedd3b:/Java/Execute.cpp

diff --git a/Java/Execute.cpp b/Java/Execute.cpp
index bca2e98..d9eb1e6 100644
--- a/Java/Execute.cpp
+++ b/Java/Execute.cpp
@@ -23,12 +23,19 @@
 #include <sstream>
 #include <vector>
 
-#ifdef __APPLE__
+#include <dlfcn.h>
+
+#if defined(__APPLE__) && !defined(__arm__)
 #include <JavaVM/jni.h>
 #else
 #include <jni.h>
 #endif
 
+#ifdef __ANDROID__
+// XXX: this is deprecated?!?!?!?!?!?!
+#include <sys/system_properties.h>
+#endif
+
 #include "cycript.hpp"
 #include "Error.hpp"
 #include "Execute.hpp"
@@ -70,14 +77,6 @@ _value; })
         return value; \
     }
 
-extern "C" {
-    // Android's jni.h seriously doesn't declare these :/
-    jint JNI_CreateJavaVM(JavaVM **, void **, void *);
-    jint JNI_GetCreatedJavaVMs(JavaVM **, jsize, jsize *);
-}
-
-JNIEnv *GetJNI(JSContextRef context);
-
 #define CYJavaForEachPrimitive \
     CYJavaForEachPrimitive_(Z, z, Boolean, Boolean, boolean) \
     CYJavaForEachPrimitive_(B, b, Byte, Byte, byte) \
@@ -97,6 +96,15 @@ CYJavaForEachPrimitive
 #undef CYJavaForEachPrimitive_
 };
 
+template <typename Type_>
+struct IsJavaPrimitive { static const bool value = false; };
+
+#define CYJavaForEachPrimitive_(T, t, Typ, Type, type) \
+    template <> \
+    struct IsJavaPrimitive<j ## type> { static const bool value = true; };
+CYJavaForEachPrimitive
+#undef CYJavaForEachPrimitive_
+
 // Java References {{{
 template <typename Value_>
 struct CYJavaRef {
@@ -117,6 +125,7 @@ struct CYJavaRef {
         return jni_;
     }
 
+    // XXX: this is only needed to support CYJavaEnv relying on C variadics
     _finline Value_ get() const {
         return value_;
     }
@@ -126,6 +135,7 @@ struct CYJavaRef {
         return {jni_, static_cast<Other_>(value_)};
     }
 
+    // XXX: this should be tied into CYJavaFrame
     Value_ leak() {
         Value_ value(value_);
         value_ = NULL;
@@ -142,9 +152,14 @@ struct CYJavaDelete :
     {
     }
 
-    ~CYJavaDelete() {
+    void clear() {
         if (this->value_ != NULL)
             (this->jni_->*Delete_)(this->value_);
+        this->value_ = NULL;
+    }
+
+    ~CYJavaDelete() {
+        clear();
     }
 };
 
@@ -199,15 +214,24 @@ struct CYJavaLocal :
     {
     }
 
-    CYJavaLocal(CYJavaLocal &&value) :
-        CYJavaLocal(value.jni_, value.value_)
+    template <typename Other_>
+    CYJavaLocal(CYJavaRef<Other_> &&other) :
+        CYJavaLocal(other.jni_, other.value_)
     {
-        value.value_ = NULL;
+        other.value_ = NULL;
     }
 
-    CYJavaLocal &operator =(CYJavaLocal<Value_> &&other) {
-        std::swap(this->jni_, other.jni_);
-        std::swap(this->value_, other.value_);
+    CYJavaLocal(CYJavaLocal &&other) :
+        CYJavaLocal(static_cast<CYJavaRef<Value_> &&>(other))
+    {
+    }
+
+    template <typename Other_>
+    CYJavaLocal &operator =(CYJavaLocal<Other_> &&other) {
+        this->clear();
+        this->jni_ = other.jni_;
+        this->value_ = other.value_;
+        other.value_ = NULL;
         return *this;
     }
 };
@@ -292,6 +316,10 @@ struct CYJavaFrame {
         operator ()(NULL);
     }
 
+    operator JNIEnv *() const {
+        return jni_;
+    }
+
     jobject operator ()(jobject object) {
         JNIEnv *jni(jni_);
         jni_ = NULL;
@@ -375,7 +403,7 @@ CYJavaForEachPrimitive
 
 #define CYJavaEnv_(Code) \
     template <typename... Args_> \
-    auto Code(Args_ &&... args) const -> decltype(jni->Code(args...)) { \
+    auto Code(Args_ &&... args) const -> decltype(jni->Code(cy::Forward<Args_>(args)...)) { \
         return _envcall(jni, Code(cy::Forward<Args_>(args)...)); \
     }
 
@@ -395,6 +423,7 @@ CYJavaForEachPrimitive
     CYJavaEnv_(GetMethodID)
     CYJavaEnv_(GetStaticMethodID)
     CYJavaEnv_(IsSameObject)
+    CYJavaEnv_(RegisterNatives)
 #undef CYJavaEnv_
 
 #define CYJavaEnv_(Code) \
@@ -605,10 +634,13 @@ struct CYJavaArray :
 struct CYJavaPackage :
     CYPrivate<CYJavaPackage>
 {
+    JNIEnv *jni_;
+
     typedef std::vector<std::string> Path;
     Path package_;
 
-    _finline CYJavaPackage(const Path &package) :
+    _finline CYJavaPackage(JNIEnv *jni, const Path &package) :
+        jni_(jni),
         package_(package)
     {
     }
@@ -855,7 +887,9 @@ CYJavaForEachPrimitive
     }
 }
 
-static bool CYCastJavaArguments(const CYJavaEnv &jni, const CYJavaShorty &shorty, JSContextRef context, const JSValueRef arguments[], jvalue *array) {
+static bool CYCastJavaArguments(const CYJavaFrame &frame, const CYJavaShorty &shorty, JSContextRef context, const JSValueRef arguments[], jvalue *array) {
+    CYJavaEnv jni(frame);
+
     for (size_t index(0); index != shorty.size(); ++index) {
         JSValueRef argument(arguments[index]);
         JSType type(JSValueGetType(context, argument));
@@ -863,6 +897,7 @@ static bool CYCastJavaArguments(const CYJavaEnv &jni, const CYJavaShorty &shorty
 
         switch (CYJavaPrimitive primitive = shorty[index]) {
             case CYJavaPrimitiveObject:
+                // XXX: figure out a way to tie this in to the CYJavaFrame
                 value.l = CYCastJavaObject(jni, context, argument).leak();
             break;
 
@@ -906,15 +941,16 @@ static bool CYCastJavaArguments(const CYJavaEnv &jni, const CYJavaShorty &shorty
 }
 
 static JSValueRef JavaMethod_callAsFunction(JSContextRef context, JSObjectRef object, JSObjectRef _this, size_t count, const JSValueRef arguments[], JSValueRef *exception) { CYTry {
-    CYJavaMethod *internal(reinterpret_cast<CYJavaMethod *>(JSObjectGetPrivate(object)));
+    auto internal(CYJavaMethod::Get(context, object));
     CYJavaObject *self(CYGetJavaObject(context, _this));
+    _assert(self != NULL);
     CYJavaEnv jni(self->value_);
 
     CYJavaSignature bound(count);
     for (auto overload(internal->overload_.lower_bound(bound)), e(internal->overload_.upper_bound(bound)); overload != e; ++overload) {
-        CYJavaFrame(jni, count + 16);
+        CYJavaFrame frame(jni, count + 16);
         jvalue array[count];
-        if (!CYCastJavaArguments(jni, overload->shorty_, context, arguments, array))
+        if (!CYCastJavaArguments(frame, overload->shorty_, context, arguments, array))
             continue;
         jvalue *values(array);
         switch (overload->primitive_) {
@@ -936,15 +972,15 @@ CYJavaForEachPrimitive
 } CYCatch(NULL) }
 
 static JSValueRef JavaStaticMethod_callAsFunction(JSContextRef context, JSObjectRef object, JSObjectRef _this, size_t count, const JSValueRef arguments[], JSValueRef *exception) { CYTry {
-    CYJavaMethod *internal(reinterpret_cast<CYJavaMethod *>(JSObjectGetPrivate(object)));
+    auto internal(CYJavaStaticMethod::Get(context, object));
     CYJavaClass *table(CYGetJavaTable(context, _this));
     CYJavaEnv jni(table->value_);
 
     CYJavaSignature bound(count);
     for (auto overload(internal->overload_.lower_bound(bound)), e(internal->overload_.upper_bound(bound)); overload != e; ++overload) {
-        CYJavaFrame(jni, count + 16);
+        CYJavaFrame frame(jni, count + 16);
         jvalue array[count];
-        if (!CYCastJavaArguments(jni, overload->shorty_, context, arguments, array))
+        if (!CYCastJavaArguments(frame, overload->shorty_, context, arguments, array))
             continue;
         jvalue *values(array);
         switch (overload->primitive_) {
@@ -966,23 +1002,21 @@ CYJavaForEachPrimitive
 } CYCatch(NULL) }
 
 static JSObjectRef JavaClass_callAsConstructor(JSContextRef context, JSObjectRef object, size_t count, const JSValueRef arguments[], JSValueRef *exception) { CYTry {
-    CYJavaClass *table(reinterpret_cast<CYJavaClass *>(JSObjectGetPrivate(object)));
+    auto table(CYJavaClass::Get(context, object));
     CYJavaEnv jni(table->value_);
     jclass _class(table->value_);
 
     if (table->interface_ && count == 1) {
-        JSObjectRef target(CYCastJSObject(context, arguments[0]));
         auto Cycript$(jni.FindClass("Cycript"));
-        auto Cycript$Make(jni.GetStaticMethodID(Cycript$, "proxy", "(Ljava/lang/Class;J)Ljava/lang/Object;"));
-        auto protect(new CYProtect(context, target));
-        return CYCastJSObject(context, jni.CallObjectMethod<jobject>(Cycript$, Cycript$Make, _class, reinterpret_cast<jlong>(protect)));
+        auto Cycript$Make(jni.GetStaticMethodID(Cycript$, "proxy", "(Ljava/lang/Class;LCycript$Wrapper;)Ljava/lang/Object;"));
+        return CYCastJSObject(context, jni.CallObjectMethod<jobject>(Cycript$, Cycript$Make, _class, CYCastJavaObject(jni, context, CYCastJSObject(context, arguments[0])).get()));
     }
 
     CYJavaSignature bound(count);
     for (auto overload(table->overload_.lower_bound(bound)), e(table->overload_.upper_bound(bound)); overload != e; ++overload) {
-        CYJavaFrame(jni, count + 16);
+        CYJavaFrame frame(jni, count + 16);
         jvalue array[count];
-        if (!CYCastJavaArguments(jni, overload->shorty_, context, arguments, array))
+        if (!CYCastJavaArguments(frame, overload->shorty_, context, arguments, array))
             continue;
         jvalue *values(array);
         auto object(jni.NewObjectA(_class, overload->method_, values));
@@ -993,7 +1027,7 @@ static JSObjectRef JavaClass_callAsConstructor(JSContextRef context, JSObjectRef
 } CYCatch(NULL) }
 
 static bool JavaStaticInterior_hasProperty(JSContextRef context, JSObjectRef object, JSStringRef property) {
-    CYJavaStaticInterior *internal(reinterpret_cast<CYJavaStaticInterior *>(JSObjectGetPrivate(object)));
+    auto internal(CYJavaStaticInterior::Get(context, object));
     CYJavaClass *table(internal->table_);
     CYPool pool;
     auto name(CYPoolUTF8String(pool, context, property));
@@ -1004,7 +1038,7 @@ static bool JavaStaticInterior_hasProperty(JSContextRef context, JSObjectRef obj
 }
 
 static JSValueRef JavaStaticInterior_getProperty(JSContextRef context, JSObjectRef object, JSStringRef property, JSValueRef *exception) { CYTry {
-    CYJavaStaticInterior *internal(reinterpret_cast<CYJavaStaticInterior *>(JSObjectGetPrivate(object)));
+    auto internal(CYJavaStaticInterior::Get(context, object));
     CYJavaClass *table(internal->table_);
     CYJavaEnv jni(table->value_);
     CYPool pool;
@@ -1026,7 +1060,7 @@ CYJavaForEachPrimitive
 } CYCatch(NULL) }
 
 static bool JavaStaticInterior_setProperty(JSContextRef context, JSObjectRef object, JSStringRef property, JSValueRef value, JSValueRef *exception) { CYTry {
-    CYJavaStaticInterior *internal(reinterpret_cast<CYJavaStaticInterior *>(JSObjectGetPrivate(object)));
+    auto internal(CYJavaStaticInterior::Get(context, object));
     CYJavaClass *table(internal->table_);
     CYJavaEnv jni(table->value_);
     CYPool pool;
@@ -1051,19 +1085,19 @@ CYJavaForEachPrimitive
 } CYCatch(false) }
 
 static void JavaStaticInterior_getPropertyNames(JSContextRef context, JSObjectRef object, JSPropertyNameAccumulatorRef names) {
-    CYJavaStaticInterior *internal(reinterpret_cast<CYJavaStaticInterior *>(JSObjectGetPrivate(object)));
+    auto internal(CYJavaStaticInterior::Get(context, object));
     CYJavaClass *table(internal->table_);
     for (const auto &field : table->static_)
         JSPropertyNameAccumulatorAddName(names, CYJSString(field.first));
 }
 
 static JSValueRef JavaClass_getProperty_class(JSContextRef context, JSObjectRef object, JSStringRef property, JSValueRef *exception) { CYTry {
-    CYJavaClass *table(reinterpret_cast<CYJavaClass *>(JSObjectGetPrivate(object)));
+    auto table(CYJavaClass::Get(context, object));
     return CYCastJSValue(context, table->value_);
 } CYCatch(NULL) }
 
 static bool JavaInterior_hasProperty(JSContextRef context, JSObjectRef object, JSStringRef property) {
-    CYJavaInterior *internal(reinterpret_cast<CYJavaInterior *>(JSObjectGetPrivate(object)));
+    auto internal(CYJavaInterior::Get(context, object));
     CYJavaClass *table(internal->table_);
     CYPool pool;
     auto name(CYPoolUTF8String(pool, context, property));
@@ -1074,7 +1108,7 @@ static bool JavaInterior_hasProperty(JSContextRef context, JSObjectRef object, J
 }
 
 static JSValueRef JavaInterior_getProperty(JSContextRef context, JSObjectRef object, JSStringRef property, JSValueRef *exception) { CYTry {
-    CYJavaInterior *internal(reinterpret_cast<CYJavaInterior *>(JSObjectGetPrivate(object)));
+    auto internal(CYJavaInterior::Get(context, object));
     CYJavaEnv jni(internal->value_);
     CYJavaClass *table(internal->table_);
     CYPool pool;
@@ -1096,7 +1130,7 @@ CYJavaForEachPrimitive
 } CYCatch(NULL) }
 
 static bool JavaInterior_setProperty(JSContextRef context, JSObjectRef object, JSStringRef property, JSValueRef value, JSValueRef *exception) { CYTry {
-    CYJavaInterior *internal(reinterpret_cast<CYJavaInterior *>(JSObjectGetPrivate(object)));
+    auto internal(CYJavaInterior::Get(context, object));
     CYJavaEnv jni(internal->value_);
     CYJavaClass *table(internal->table_);
     CYPool pool;
@@ -1121,30 +1155,30 @@ CYJavaForEachPrimitive
 } CYCatch(false) }
 
 static void JavaInterior_getPropertyNames(JSContextRef context, JSObjectRef object, JSPropertyNameAccumulatorRef names) {
-    CYJavaInterior *internal(reinterpret_cast<CYJavaInterior *>(JSObjectGetPrivate(object)));
+    auto internal(CYJavaInterior::Get(context, object));
     CYJavaClass *table(internal->table_);
     for (const auto &field : table->instance_)
         JSPropertyNameAccumulatorAddName(names, CYJSString(field.first));
 }
 
 static JSValueRef JavaObject_getProperty_constructor(JSContextRef context, JSObjectRef object, JSStringRef property, JSValueRef *exception) { CYTry {
-    CYJavaObject *internal(reinterpret_cast<CYJavaObject *>(JSObjectGetPrivate(object)));
+    auto internal(CYJavaObject::Get(context, object));
     CYJavaEnv jni(internal->value_);
     return CYGetJavaClass(context, jni.GetObjectClass(internal->value_));
 } CYCatch(NULL) }
 
 static JSValueRef JavaClass_getProperty_$cyi(JSContextRef context, JSObjectRef object, JSStringRef property, JSValueRef *exception) { CYTry {
-    CYJavaClass *internal(reinterpret_cast<CYJavaClass *>(JSObjectGetPrivate(object)));
+    auto internal(CYJavaClass::Get(context, object));
     return CYJavaStaticInterior::Make(context, internal->value_, internal);
 } CYCatch(NULL) }
 
 static JSValueRef JavaObject_getProperty_$cyi(JSContextRef context, JSObjectRef object, JSStringRef property, JSValueRef *exception) { CYTry {
-    CYJavaObject *internal(reinterpret_cast<CYJavaObject *>(JSObjectGetPrivate(object)));
+    auto internal(CYJavaObject::Get(context, object));
     return CYJavaInterior::Make(context, internal->value_, internal->table_);
 } CYCatch(NULL) }
 
 static JSValueRef JavaClass_callAsFunction_toCYON(JSContextRef context, JSObjectRef object, JSObjectRef _this, size_t count, const JSValueRef arguments[], JSValueRef *exception) { CYTry {
-    CYJavaClass *internal(reinterpret_cast<CYJavaClass *>(JSObjectGetPrivate(_this)));
+    auto internal(CYJavaClass::Get(context, _this));
     CYJavaEnv jni(internal->value_);
     auto Class$(jni.FindClass("java/lang/Class"));
     auto Class$getCanonicalName(jni.GetMethodID(Class$, "getCanonicalName", "()Ljava/lang/String;"));
@@ -1162,7 +1196,7 @@ static JSValueRef JavaStaticMethod_callAsFunction_toCYON(JSContextRef context, J
 } CYCatch(NULL) }
 
 static JSValueRef JavaArray_getProperty(JSContextRef context, JSObjectRef object, JSStringRef property, JSValueRef *exception) { CYTry {
-    CYJavaArray *internal(reinterpret_cast<CYJavaArray *>(JSObjectGetPrivate(object)));
+    auto internal(CYJavaArray::Get(context, object));
     CYJavaEnv jni(internal->value_);
     if (JSStringIsEqual(property, length_s))
         return CYCastJSValue(context, jni.GetArrayLength(internal->value_));
@@ -1188,7 +1222,7 @@ CYJavaForEachPrimitive
 } CYCatch(NULL) }
 
 static bool JavaArray_setProperty(JSContextRef context, JSObjectRef object, JSStringRef property, JSValueRef value, JSValueRef *exception) { CYTry {
-    CYJavaArray *internal(reinterpret_cast<CYJavaArray *>(JSObjectGetPrivate(object)));
+    auto internal(CYJavaArray::Get(context, object));
     CYJavaEnv jni(internal->value_);
 
     CYPool pool;
@@ -1213,8 +1247,10 @@ CYJavaForEachPrimitive
     return true;
 } CYCatch(false) }
 
+static JNIEnv *GetJNI(JSContextRef context, JNIEnv *&env);
+
 static JSValueRef JavaPackage_callAsFunction_toCYON(JSContextRef context, JSObjectRef object, JSObjectRef _this, size_t count, const JSValueRef arguments[], JSValueRef *exception) { CYTry {
-    CYJavaPackage *internal(reinterpret_cast<CYJavaPackage *>(JSObjectGetPrivate(_this)));
+    auto internal(CYJavaPackage::Get(context, _this));
     std::ostringstream name;
     for (auto &package : internal->package_)
         name << package << '.';
@@ -1227,7 +1263,7 @@ static bool CYJavaPackage_hasProperty(JSContextRef context, JSObjectRef object,
 }
 
 static JSValueRef CYJavaPackage_getProperty(JSContextRef context, JSObjectRef object, JSStringRef property, JSValueRef *exception) { CYTry {
-    CYJavaPackage *internal(reinterpret_cast<CYJavaPackage *>(JSObjectGetPrivate(object)));
+    auto internal(CYJavaPackage::Get(context, object));
     CYJavaPackage::Path package(internal->package_);
 
     CYPool pool;
@@ -1238,13 +1274,16 @@ static JSValueRef CYJavaPackage_getProperty(JSContextRef context, JSObjectRef ob
         name << package << '/';
     name << next;
 
-    JNIEnv *jni(GetJNI(context));
+    if (internal->jni_ == NULL)
+        GetJNI(context, internal->jni_);
+    JNIEnv *jni(internal->jni_);
+
     if (auto _class = jni->FindClass(name.str().c_str()))
         return CYGetJavaClass(context, CYJavaLocal<jclass>(jni, _class));
     jni->ExceptionClear();
 
     package.push_back(next);
-    return CYJavaPackage::Make(context, package);
+    return CYJavaPackage::Make(context, jni, package);
 } CYCatch(NULL) }
 
 static void Cycript_delete(JNIEnv *env, jclass api, jlong jprotect) { CYJavaTry {
@@ -1258,11 +1297,10 @@ static jobject Cycript_handle(JNIEnv *env, jclass api, jlong jprotect, jstring p
 
     size_t count(jarguments == NULL ? 0 : jni.GetArrayLength(jarguments));
     JSValueRef arguments[count];
-    for (size_t index(0); index != count; ++index) {
+    for (size_t index(0); index != count; ++index)
         arguments[index] = CYCastJSValue(context, jni.GetObjectArrayElement<jobject>(jarguments, index));
-    }
 
-    return CYCastJavaObject(jni, context, CYCallAsFunction(context, CYCastJSObject(context, function), object, count, arguments));
+    return CYCastJavaObject(jni, context, CYCallAsFunction(context, CYCastJSObject(context, function), object, count, arguments)).leak();
 } CYJavaCatch(NULL) }
 
 static JNINativeMethod Cycript_[] = {
@@ -1270,47 +1308,188 @@ static JNINativeMethod Cycript_[] = {
     {(char *) "handle", (char *) "(JLjava/lang/String;[Ljava/lang/Object;)Ljava/lang/Object;", (void *) &Cycript_handle},
 };
 
-JNIEnv *GetJNI(JSContextRef context) {
-    static JavaVM *jvm(NULL);
-    static JNIEnv *jni(NULL);
+template <typename Type_>
+static _finline void dlset(Type_ &function, const char *name, void *handle) {
+    function = reinterpret_cast<Type_>(dlsym(handle, name));
+}
 
-    if (jni != NULL)
-        return jni;
-    jint version(JNI_VERSION_1_4);
+jint CYJavaVersion(JNI_VERSION_1_4);
 
+static JavaVM *CYGetJavaVM(jint (*$JNI_GetCreatedJavaVMs)(JavaVM **, jsize, jsize *)) {
     jsize capacity(16);
     JavaVM *jvms[capacity];
     jsize size;
-    _jnicall(JNI_GetCreatedJavaVMs(jvms, capacity, &size));
+    _jnicall($JNI_GetCreatedJavaVMs(jvms, capacity, &size));
+    if (size == 0)
+        return NULL;
+    return jvms[0];
+}
+
+static JavaVM *CYGetJavaVM(JSContextRef context) {
+    CYPool pool;
+    void *handle(RTLD_DEFAULT);
+    std::string library;
 
-    if (size != 0) {
-        jvm = jvms[0];
-        _jnicall(jvm->GetEnv(reinterpret_cast<void **>(&jni), version));
+    jint (*$JNI_GetCreatedJavaVMs)(JavaVM **jvms, jsize capacity, jsize *size);
+    dlset($JNI_GetCreatedJavaVMs, "JNI_GetCreatedJavaVMs", handle);
+
+    if ($JNI_GetCreatedJavaVMs != NULL) {
+        if (JavaVM *jvm = CYGetJavaVM($JNI_GetCreatedJavaVMs))
+            return jvm;
     } else {
-        CYPool pool;
-        std::vector<JavaVMOption> options;
-
-        {
-            std::ostringstream option;
-            option << "-Djava.class.path=";
-            option << CYPoolLibraryPath(pool) << "/libcycript.jar";
-            if (const char *classpath = getenv("CLASSPATH"))
-                option << ':' << classpath;
-            options.push_back(JavaVMOption{pool.strdup(option.str().c_str()), NULL});
+        std::vector<const char *> guesses;
+
+#ifdef __ANDROID__
+        char android[PROP_VALUE_MAX];
+        if (__system_property_get("persist.sys.dalvik.vm.lib", android) != 0)
+            guesses.push_back(android);
+#endif
+
+        guesses.push_back("/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/lib/jli/libjli.dylib");
+        //guesses.push_back("/System/Library/Frameworks/JavaVM.framework/JavaVM");
+        guesses.push_back("libjvm.dylib");
+
+        guesses.push_back("libart.so");
+        guesses.push_back("libdvm.so");
+        guesses.push_back("libjvm.so");
+
+        for (const char *guess : guesses) {
+            handle = dlopen(guess, RTLD_LAZY | RTLD_GLOBAL);
+            if (handle != NULL) {
+                library = guess;
+                break;
+            }
         }
 
-        JavaVMInitArgs args;
-        memset(&args, 0, sizeof(args));
-        args.version = version;
-        args.nOptions = options.size();
-        args.options = options.data();
-        _jnicall(JNI_CreateJavaVM(&jvm, reinterpret_cast<void **>(&jni), &args));
+        if (library.size() == 0)
+            return NULL;
+
+        dlset($JNI_GetCreatedJavaVMs, "JNI_GetCreatedJavaVMs", handle);
+        if (JavaVM *jvm = CYGetJavaVM($JNI_GetCreatedJavaVMs))
+            return jvm;
     }
 
-    auto Cycript$(CYJavaEnv(jni).FindClass("Cycript"));
-    _envcall(jni, RegisterNatives(Cycript$, Cycript_, sizeof(Cycript_) / sizeof(Cycript_[0])));
+    std::vector<JavaVMOption> options;
+
+    {
+        std::ostringstream option;
+        option << "-Djava.class.path=";
+        option << CYPoolLibraryPath(pool) << "/libcycript.jar";
+        if (const char *classpath = getenv("CLASSPATH"))
+            option << ':' << classpath;
+        options.push_back(JavaVMOption{pool.strdup(option.str().c_str()), NULL});
+    }
+
+    // To use libnativehelper to access JNI_GetCreatedJavaVMs, you need JniInvocation.
+    // ...but there can only be one JniInvocation, and assuradely the other VM has it.
+    // Essentially, this API makes no sense. We need it for AndroidRuntime, though :/.
+
+    if (void *libnativehelper = dlopen("libnativehelper.so", RTLD_LAZY | RTLD_GLOBAL)) {
+        class JniInvocation$;
+        JniInvocation$ *(*JniInvocation$$init$)(JniInvocation$ *self)(NULL);
+        bool (*JniInvocation$Init)(JniInvocation$ *self, const char *library)(NULL);
+        JniInvocation$ *(*JniInvocation$finalize)(JniInvocation$ *self)(NULL);
+
+        dlset(JniInvocation$$init$, "_ZN13JniInvocationC1Ev", libnativehelper);
+        dlset(JniInvocation$Init, "_ZN13JniInvocation4InitEPKc", libnativehelper);
+        dlset(JniInvocation$finalize, "_ZN13JniInvocationD1Ev", libnativehelper);
+
+        if (JniInvocation$$init$ == NULL)
+            dlclose(libnativehelper);
+        else {
+            // XXX: we should attach a pool to the VM itself and deallocate this there
+            //auto invocation(pool.calloc<JniInvocation$>(1, 1024));
+            //_assert(JniInvocation$finalize != NULL);
+            //pool.atexit(reinterpret_cast<void (*)(void *)>(JniInvocation$finalize), invocation);
+
+            auto invocation(static_cast<JniInvocation$ *>(calloc(1, 1024)));
+            JniInvocation$$init$(invocation);
+
+            _assert(JniInvocation$Init != NULL);
+            JniInvocation$Init(invocation, NULL);
+
+            dlset($JNI_GetCreatedJavaVMs, "JNI_GetCreatedJavaVMs", libnativehelper);
+            if (JavaVM *jvm = CYGetJavaVM($JNI_GetCreatedJavaVMs))
+                return jvm;
+        }
+    }
+
+    JavaVM *jvm;
+    JNIEnv *env;
+
+    if (void *libandroid_runtime = dlopen("libandroid_runtime.so", RTLD_LAZY | RTLD_GLOBAL)) {
+        class AndroidRuntime$;
+        AndroidRuntime$ *(*AndroidRuntime$$init$)(AndroidRuntime$ *self, char *args, unsigned int size)(NULL);
+        int (*AndroidRuntime$startVm)(AndroidRuntime$ *self, JavaVM **jvm, JNIEnv **env)(NULL);
+        int (*AndroidRuntime$startReg)(JNIEnv *env)(NULL);
+        int (*AndroidRuntime$addOption)(AndroidRuntime$ *self, const char *option, void *extra)(NULL);
+        int (*AndroidRuntime$addVmArguments)(AndroidRuntime$ *self, int, const char *const argv[])(NULL);
+        AndroidRuntime$ *(*AndroidRuntime$finalize)(AndroidRuntime$ *self)(NULL);
 
-    return jni;
+        dlset(AndroidRuntime$$init$, "_ZN7android14AndroidRuntimeC1EPcj", libandroid_runtime);
+        dlset(AndroidRuntime$startVm, "_ZN7android14AndroidRuntime7startVmEPP7_JavaVMPP7_JNIEnv", libandroid_runtime);
+        dlset(AndroidRuntime$startReg, "_ZN7android14AndroidRuntime8startRegEP7_JNIEnv", libandroid_runtime);
+        dlset(AndroidRuntime$addOption, "_ZN7android14AndroidRuntime9addOptionEPKcPv", libandroid_runtime);
+        dlset(AndroidRuntime$addVmArguments, "_ZN7android14AndroidRuntime14addVmArgumentsEiPKPKc", libandroid_runtime);
+        dlset(AndroidRuntime$finalize, "_ZN7android14AndroidRuntimeD1Ev", libandroid_runtime);
+
+        // XXX: it would also be interesting to attach this to a global pool
+        AndroidRuntime$ *runtime(pool.calloc<AndroidRuntime$>(1, 1024));
+
+        _assert(AndroidRuntime$$init$ != NULL);
+        AndroidRuntime$$init$(runtime, NULL, 0);
+
+        if (AndroidRuntime$addOption == NULL) {
+            _assert(AndroidRuntime$addVmArguments != NULL);
+            std::vector<const char *> arguments;
+            for (const auto &option : options)
+                arguments.push_back(option.optionString);
+            AndroidRuntime$addVmArguments(runtime, arguments.size(), arguments.data());
+        } else for (const auto &option : options)
+            AndroidRuntime$addOption(runtime, option.optionString, option.extraInfo);
+
+        int failure;
+
+        _assert(AndroidRuntime$startVm != NULL);
+        failure = AndroidRuntime$startVm(runtime, &jvm, &env);
+        _assert(failure == 0);
+
+        _assert(AndroidRuntime$startReg != NULL);
+        failure = AndroidRuntime$startReg(env);
+        _assert(failure == 0);
+
+        return jvm;
+    }
+
+    jint (*$JNI_CreateJavaVM)(JavaVM **jvm, void **, void *);
+    dlset($JNI_CreateJavaVM, "JNI_CreateJavaVM", handle);
+
+    JavaVMInitArgs args;
+    memset(&args, 0, sizeof(args));
+    args.version = CYJavaVersion;
+    args.nOptions = options.size();
+    args.options = options.data();
+    _jnicall($JNI_CreateJavaVM(&jvm, reinterpret_cast<void **>(&env), &args));
+    return jvm;
+}
+
+static JNIEnv *GetJNI(JSContextRef context, JNIEnv *&env) {
+    auto jvm(CYGetJavaVM(context));
+    _assert(jvm != NULL);
+    _jnicall(jvm->GetEnv(reinterpret_cast<void **>(&env), CYJavaVersion));
+    CYJavaEnv jni(env);
+
+    // XXX: this happens once per stub :/
+
+    auto Cycript$(jni.FindClass("Cycript"));
+    jni.RegisterNatives(Cycript$, Cycript_, sizeof(Cycript_) / sizeof(Cycript_[0]));
+
+    JSObjectRef java(CYGetCachedObject(context, CYJSString("Java")));
+    JSValueRef arguments[1];
+    arguments[0] = CYCastJSValue(context, CYJSString("setup"));
+    CYCallAsFunction(context, CYCastJSObject(context, CYGetProperty(context, java, CYJSString("emit"))), java, 1, arguments);
+
+    return env;
 }
 
 static JSStaticValue JavaClass_staticValues[3] = {
@@ -1421,20 +1600,21 @@ CYJavaForEachPrimitive
 
 void CYJava_SetupContext(JSContextRef context) {
     JSObjectRef global(CYGetGlobalObject(context));
-    //JSObjectRef cy(CYCastJSObject(context, CYGetProperty(context, global, cy_s)));
+    JSObjectRef cy(CYCastJSObject(context, CYGetProperty(context, global, cy_s)));
     JSObjectRef cycript(CYCastJSObject(context, CYGetProperty(context, global, CYJSString("Cycript"))));
     JSObjectRef all(CYCastJSObject(context, CYGetProperty(context, cycript, CYJSString("all"))));
     //JSObjectRef alls(CYCastJSObject(context, CYGetProperty(context, cycript, CYJSString("alls"))));
 
     JSObjectRef Java(JSObjectMake(context, NULL, NULL));
     CYSetProperty(context, cycript, CYJSString("Java"), Java);
+    CYSetProperty(context, cy, CYJSString("Java"), Java);
 
-    JSObjectRef Packages(CYJavaPackage::Make(context, CYJavaPackage::Path()));
-    CYSetProperty(context, all, CYJSString("Packages"), Packages);
+    JSObjectRef Packages(CYJavaPackage::Make(context, nullptr, CYJavaPackage::Path()));
+    CYSetProperty(context, all, CYJSString("Packages"), Packages, kJSPropertyAttributeDontEnum);
 
     for (auto name : (const char *[]) {"java", "javax", "android", "com", "net", "org"}) {
         CYJSString js(name);
-        CYSetProperty(context, all, js, CYGetProperty(context, Packages, js));
+        CYSetProperty(context, all, js, CYJavaPackage::Make(context, nullptr, CYJavaPackage::Path(1, name)), kJSPropertyAttributeDontEnum);
     }
 }