X-Git-Url: https://git.saurik.com/cycript.git/blobdiff_plain/97d3f26862897521f7cce86924067e5eb7668af2..7085e1abd73d7405804870e2404d38c4d22ea73e:/Execute.cpp

diff --git a/Execute.cpp b/Execute.cpp
index b0c8aac..68a0d39 100644
--- a/Execute.cpp
+++ b/Execute.cpp
@@ -1,56 +1,61 @@
 /* Cycript - Optimizing JavaScript Compiler/Runtime
- * Copyright (C) 2009-2013  Jay Freeman (saurik)
+ * Copyright (C) 2009-2015  Jay Freeman (saurik)
 */
 
-/* GNU General Public License, Version 3 {{{ */
+/* GNU Affero General Public License, Version 3 {{{ */
 /*
- * Cycript is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation, either version 3 of the License,
- * or (at your option) any later version.
- *
- * Cycript is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Cycript.  If not, see <http://www.gnu.org/licenses/>.
+ * GNU Affero General Public License for more details.
+
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 **/
 /* }}} */
 
-#include "Internal.hpp"
+#include "cycript.hpp"
+
+#include <iostream>
+#include <set>
+#include <map>
+#include <iomanip>
+#include <sstream>
+#include <cmath>
 
 #include <dlfcn.h>
 #include <dirent.h>
 #include <fcntl.h>
 #include <unistd.h>
 
-#include "cycript.hpp"
-
-#include "sig/parse.hpp"
-#include "sig/ffi_type.hpp"
-
-#include "Pooling.hpp"
-#include "Execute.hpp"
-
 #include <sys/mman.h>
 #include <sys/stat.h>
 
-#include <iostream>
-#include <set>
-#include <map>
-#include <iomanip>
-#include <sstream>
-#include <cmath>
+#include "sig/parse.hpp"
+#include "sig/ffi_type.hpp"
 
 #include "Code.hpp"
 #include "Decode.hpp"
 #include "Error.hpp"
+#include "Execute.hpp"
+#include "Internal.hpp"
 #include "JavaScript.hpp"
+#include "Pooling.hpp"
 #include "String.hpp"
 
-struct CYHooks *hooks_;
+static std::vector<CYHook *> &GetHooks() {
+    static std::vector<CYHook *> hooks;
+    return hooks;
+}
+
+CYRegisterHook::CYRegisterHook(CYHook *hook) {
+    GetHooks().push_back(hook);
+}
 
 /* JavaScript Properties {{{ */
 bool CYHasProperty(JSContextRef context, JSObjectRef object, JSStringRef name) {
@@ -76,6 +81,11 @@ void CYSetProperty(JSContextRef context, JSObjectRef object, JSStringRef name, J
 void CYSetProperty(JSContextRef context, JSObjectRef object, JSStringRef name, JSValueRef (*callback)(JSContextRef, JSObjectRef, JSObjectRef, size_t, const JSValueRef[], JSValueRef *), JSPropertyAttributes attributes) {
     CYSetProperty(context, object, name, JSObjectMakeFunctionWithCallback(context, name, callback), attributes);
 }
+
+void CYSetPrototype(JSContextRef context, JSObjectRef object, JSValueRef value) {
+    JSObjectSetPrototype(context, object, value);
+    _assert(CYIsStrictEqual(context, JSObjectGetPrototype(context, object), value));
+}
 /* }}} */
 /* JavaScript Strings {{{ */
 JSStringRef CYCopyJSString(const char *value) {
@@ -142,6 +152,7 @@ JSStringRef toCYON_s;
 JSStringRef toJSON_s;
 JSStringRef toPointer_s;
 JSStringRef toString_s;
+JSStringRef weak_s;
 
 static JSStringRef Result_;
 
@@ -229,9 +240,6 @@ struct Struct_privateData :
     }
 };
 
-typedef std::map<const char *, Type_privateData *, CYCStringLess> TypeMap;
-static TypeMap Types_;
-
 JSObjectRef CYMakeStruct(JSContextRef context, void *data, sig::Type *type, ffi_type *ffi, JSObjectRef owner) {
     Struct_privateData *internal(new Struct_privateData(context, owner));
     CYPool &pool(*internal->pool_);
@@ -251,6 +259,10 @@ JSObjectRef CYMakeStruct(JSContextRef context, void *data, sig::Type *type, ffi_
 }
 
 static void *CYCastSymbol(const char *name) {
+    for (CYHook *hook : GetHooks())
+        if (hook->CastSymbol != NULL)
+            if (void *value = (*hook->CastSymbol)(name))
+                return value;
     return dlsym(RTLD_DEFAULT, name);
 }
 
@@ -310,6 +322,14 @@ bool CYIsCallable(JSContextRef context, JSValueRef value) {
     return value != NULL && JSValueIsObject(context, value) && JSObjectIsFunction(context, (JSObjectRef) value);
 }
 
+bool CYIsEqual(JSContextRef context, JSValueRef lhs, JSValueRef rhs) {
+    return _jsccall(JSValueIsEqual, context, lhs, rhs);
+}
+
+bool CYIsStrictEqual(JSContextRef context, JSValueRef lhs, JSValueRef rhs) {
+    return JSValueIsStrictEqual(context, lhs, rhs);
+}
+
 size_t CYArrayLength(JSContextRef context, JSObjectRef array) {
     return CYCastDouble(context, CYGetProperty(context, array, length_s));
 }
@@ -336,26 +356,25 @@ static JSValueRef System_print(JSContextRef context, JSObjectRef object, JSObjec
     return CYJSUndefined(context);
 } CYCatch(NULL) }
 
-static size_t Nonce_(0);
-
-static JSValueRef $cyq(JSContextRef context, JSObjectRef object, JSObjectRef _this, size_t count, const JSValueRef arguments[], JSValueRef *exception) { CYTry {
-    CYPool pool;
-    const char *name(pool.strcat(CYPoolCString(pool, context, arguments[0]), pool.itoa(Nonce_++), NULL));
-    return CYCastJSValue(context, name);
-} CYCatch(NULL) }
-
 static void (*JSSynchronousGarbageCollectForDebugging$)(JSContextRef);
 
-void CYGarbageCollect(JSContextRef context) {
+_visible void CYGarbageCollect(JSContextRef context) {
     (JSSynchronousGarbageCollectForDebugging$ ?: &JSGarbageCollect)(context);
 }
 
+static JSValueRef Cycript_compile_callAsFunction(JSContextRef context, JSObjectRef object, JSObjectRef _this, size_t count, const JSValueRef arguments[], JSValueRef *exception) { CYTry {
+    CYPool pool;
+    std::stringstream value(CYPoolCString(pool, context, arguments[0]));
+    CYUTF8String code(CYPoolCode(pool, value));
+    return CYCastJSValue(context, CYJSString(code));
+} CYCatch(NULL) }
+
 static JSValueRef Cycript_gc_callAsFunction(JSContextRef context, JSObjectRef object, JSObjectRef _this, size_t count, const JSValueRef arguments[], JSValueRef *exception) { CYTry {
     CYGarbageCollect(context);
     return CYJSUndefined(context);
 } CYCatch(NULL) }
 
-const char *CYPoolCCYON(CYPool &pool, JSContextRef context, JSValueRef value, JSValueRef *exception) { CYTry {
+const char *CYPoolCCYON(CYPool &pool, JSContextRef context, JSValueRef value, std::set<void *> &objects, JSValueRef *exception) { CYTry {
     switch (JSType type = JSValueGetType(context, value)) {
         case kJSTypeUndefined:
             return "undefined";
@@ -380,20 +399,31 @@ const char *CYPoolCCYON(CYPool &pool, JSContextRef context, JSValueRef value, JS
         } break;
 
         case kJSTypeObject:
-            return CYPoolCCYON(pool, context, (JSObjectRef) value);
+            return CYPoolCCYON(pool, context, (JSObjectRef) value, objects);
         default:
             throw CYJSError(context, "JSValueGetType() == 0x%x", type);
     }
 } CYCatch(NULL) }
 
-const char *CYPoolCCYON(CYPool &pool, JSContextRef context, JSValueRef value) {
-    return _jsccall(CYPoolCCYON, pool, context, value);
+const char *CYPoolCCYON(CYPool &pool, JSContextRef context, JSValueRef value, std::set<void *> &objects) {
+    return _jsccall(CYPoolCCYON, pool, context, value, objects);
+}
+
+const char *CYPoolCCYON(CYPool &pool, JSContextRef context, JSValueRef value, std::set<void *> *objects) {
+    if (objects != NULL)
+        return CYPoolCCYON(pool, context, value, *objects);
+    else {
+        std::set<void *> objects;
+        return CYPoolCCYON(pool, context, value, objects);
+    }
 }
 
-const char *CYPoolCCYON(CYPool &pool, JSContextRef context, JSObjectRef object) {
+const char *CYPoolCCYON(CYPool &pool, JSContextRef context, JSObjectRef object, std::set<void *> &objects) {
     JSValueRef toCYON(CYGetProperty(context, object, toCYON_s));
     if (CYIsCallable(context, toCYON)) {
-        JSValueRef value(CYCallAsFunction(context, (JSObjectRef) toCYON, object, 0, NULL));
+        // XXX: this needs to be abstracted behind some kind of function
+        JSValueRef arguments[1] = {CYCastJSValue(context, reinterpret_cast<uintptr_t>(&objects))};
+        JSValueRef value(CYCallAsFunction(context, (JSObjectRef) toCYON, object, 1, arguments));
         _assert(value != NULL);
         return CYPoolCString(pool, context, value);
     }
@@ -401,7 +431,7 @@ const char *CYPoolCCYON(CYPool &pool, JSContextRef context, JSObjectRef object)
     JSValueRef toJSON(CYGetProperty(context, object, toJSON_s));
     if (CYIsCallable(context, toJSON)) {
         JSValueRef arguments[1] = {CYCastJSValue(context, CYJSString(""))};
-        return _jsccall(CYPoolCCYON, pool, context, CYCallAsFunction(context, (JSObjectRef) toJSON, object, 1, arguments));
+        return _jsccall(CYPoolCCYON, pool, context, CYCallAsFunction(context, (JSObjectRef) toJSON, object, 1, arguments), objects);
     }
 
     if (JSObjectIsFunction(context, object)) {
@@ -414,6 +444,8 @@ const char *CYPoolCCYON(CYPool &pool, JSContextRef context, JSObjectRef object)
         }
     }
 
+    _assert(objects.insert(object).second);
+
     std::ostringstream str;
 
     str << '{';
@@ -441,7 +473,7 @@ const char *CYPoolCCYON(CYPool &pool, JSContextRef context, JSObjectRef object)
 
         try {
             JSValueRef value(CYGetProperty(context, object, name));
-            str << CYPoolCCYON(pool, context, value);
+            str << CYPoolCCYON(pool, context, value, objects);
         } catch (const CYException &error) {
             str << "@error";
         }
@@ -455,7 +487,19 @@ const char *CYPoolCCYON(CYPool &pool, JSContextRef context, JSObjectRef object)
     return pool.strmemdup(string.c_str(), string.size());
 }
 
+std::set<void *> *CYCastObjects(JSContextRef context, JSObjectRef _this, size_t count, const JSValueRef arguments[]) {
+    if (count == 0)
+        return NULL;
+    return CYCastPointer<std::set<void *> *>(context, arguments[0]);
+}
+
 static JSValueRef Array_callAsFunction_toCYON(JSContextRef context, JSObjectRef object, JSObjectRef _this, size_t count, const JSValueRef arguments[], JSValueRef *exception) { CYTry {
+    std::set<void *> *objects(CYCastObjects(context, _this, count, arguments));
+    // XXX: this is horribly inefficient
+    std::set<void *> backup;
+    if (objects == NULL)
+        objects = &backup;
+
     CYPool pool;
     std::ostringstream str;
 
@@ -473,7 +517,7 @@ static JSValueRef Array_callAsFunction_toCYON(JSContextRef context, JSObjectRef
         try {
             JSValueRef value(CYGetProperty(context, _this, index));
             if (!JSValueIsUndefined(context, value))
-                str << CYPoolCCYON(pool, context, value);
+                str << CYPoolCCYON(pool, context, value, *objects);
             else {
                 str << ',';
                 comma = false;
@@ -489,6 +533,21 @@ static JSValueRef Array_callAsFunction_toCYON(JSContextRef context, JSObjectRef
     return CYCastJSValue(context, CYJSString(CYUTF8String(value.c_str(), value.size())));
 } CYCatch(NULL) }
 
+static JSValueRef Error_callAsFunction_toCYON(JSContextRef context, JSObjectRef object, JSObjectRef _this, size_t count, const JSValueRef arguments[], JSValueRef *exception) { CYTry {
+    CYPool pool;
+    std::ostringstream str;
+
+    str << "new " << CYPoolUTF8String(pool, context, CYJSString(context, CYGetProperty(context, _this, name_s))) << "(";
+
+    CYUTF8String string(CYPoolUTF8String(pool, context, CYJSString(context, CYGetProperty(context, _this, message_s))));
+    CYStringify(str, string.data, string.size);
+
+    str << ")";
+
+    std::string value(str.str());
+    return CYCastJSValue(context, CYJSString(CYUTF8String(value.c_str(), value.size())));
+} CYCatch(NULL) }
+
 static JSValueRef String_callAsFunction_toCYON(JSContextRef context, JSObjectRef object, JSObjectRef _this, size_t count, const JSValueRef arguments[], JSValueRef *exception) { CYTry {
     CYPool pool;
     std::ostringstream str;
@@ -531,7 +590,9 @@ static bool CYGetOffset(CYPool &pool, JSContextRef context, JSStringRef value, s
 }
 
 void *CYCastPointer_(JSContextRef context, JSValueRef value) {
-    switch (JSValueGetType(context, value)) {
+    if (value == NULL)
+        return NULL;
+    else switch (JSValueGetType(context, value)) {
         case kJSTypeNull:
             return NULL;
         case kJSTypeObject: {
@@ -640,9 +701,10 @@ void CYPoolFFI(CYPool *pool, JSContextRef context, sig::Type *type, ffi_type *ff
         break;
 
         default:
-            if (hooks_ != NULL && hooks_->PoolFFI != NULL)
-                if ((*hooks_->PoolFFI)(pool, context, type, ffi, data, value))
-                    return;
+            for (CYHook *hook : GetHooks())
+                if (hook->PoolFFI != NULL)
+                    if ((*hook->PoolFFI)(pool, context, type, ffi, data, value))
+                        return;
 
             CYThrow("unimplemented signature code: '%c''\n", type->primitive);
     }
@@ -693,15 +755,16 @@ JSValueRef CYFromFFI(JSContextRef context, sig::Type *type, ffi_type *ffi, void
         null:
             return CYJSNull(context);
         default:
-            if (hooks_ != NULL && hooks_->FromFFI != NULL)
-                if (JSValueRef value = (*hooks_->FromFFI)(context, type, ffi, data, initialize, owner))
-                    return value;
+            for (CYHook *hook : GetHooks())
+                if (hook->FromFFI != NULL)
+                    if (JSValueRef value = (*hook->FromFFI)(context, type, ffi, data, initialize, owner))
+                        return value;
 
             CYThrow("unimplemented signature code: '%c''\n", type->primitive);
     }
 }
 
-void CYExecuteClosure(ffi_cif *cif, void *result, void **arguments, void *arg, JSValueRef (*adapter)(JSContextRef, size_t, JSValueRef[], JSObjectRef)) {
+void CYExecuteClosure(ffi_cif *cif, void *result, void **arguments, void *arg) {
     Closure_privateData *internal(reinterpret_cast<Closure_privateData *>(arg));
 
     JSContextRef context(internal->context_);
@@ -712,7 +775,7 @@ void CYExecuteClosure(ffi_cif *cif, void *result, void **arguments, void *arg, J
     for (size_t index(0); index != count; ++index)
         values[index] = CYFromFFI(context, internal->signature_.elements[1 + index].type, internal->cif_.arg_types[index], arguments[index]);
 
-    JSValueRef value(adapter(context, count, values, internal->function_));
+    JSValueRef value(internal->adapter_(context, count, values, internal->function_));
     CYPoolFFI(NULL, context, internal->signature_.elements[0].type, internal->cif_.rtype, result, value);
 }
 
@@ -720,20 +783,16 @@ static JSValueRef FunctionAdapter_(JSContextRef context, size_t count, JSValueRe
     return CYCallAsFunction(context, function, NULL, count, values);
 }
 
-static void FunctionClosure_(ffi_cif *cif, void *result, void **arguments, void *arg) {
-    CYExecuteClosure(cif, result, arguments, arg, &FunctionAdapter_);
-}
-
-Closure_privateData *CYMakeFunctor_(JSContextRef context, JSObjectRef function, const sig::Signature &signature, void (*callback)(ffi_cif *, void *, void **, void *)) {
+Closure_privateData *CYMakeFunctor_(JSContextRef context, JSObjectRef function, const sig::Signature &signature, JSValueRef (*adapter)(JSContextRef, size_t, JSValueRef[], JSObjectRef)) {
     // XXX: in case of exceptions this will leak
     // XXX: in point of fact, this may /need/ to leak :(
-    Closure_privateData *internal(new Closure_privateData(context, function, signature));
+    Closure_privateData *internal(new Closure_privateData(context, function, adapter, signature));
 
 #if defined(__APPLE__) && (defined(__arm__) || defined(__arm64__))
     void *executable;
     ffi_closure *writable(reinterpret_cast<ffi_closure *>(ffi_closure_alloc(sizeof(ffi_closure), &executable)));
 
-    ffi_status status(ffi_prep_closure_loc(writable, &internal->cif_, callback, internal, executable));
+    ffi_status status(ffi_prep_closure_loc(writable, &internal->cif_, &CYExecuteClosure, internal, executable));
     _assert(status == FFI_OK);
 
     internal->value_ = executable;
@@ -744,7 +803,7 @@ Closure_privateData *CYMakeFunctor_(JSContextRef context, JSObjectRef function,
         -1, 0
     )));
 
-    ffi_status status(ffi_prep_closure(closure, &internal->cif_, callback, internal));
+    ffi_status status(ffi_prep_closure(closure, &internal->cif_, &CYExecuteClosure, internal));
     _assert(status == FFI_OK);
 
     _syscall(mprotect(closure, sizeof(*closure), PROT_READ | PROT_EXEC));
@@ -756,15 +815,19 @@ Closure_privateData *CYMakeFunctor_(JSContextRef context, JSObjectRef function,
 }
 
 static JSObjectRef CYMakeFunctor(JSContextRef context, JSObjectRef function, const sig::Signature &signature) {
-    Closure_privateData *internal(CYMakeFunctor_(context, function, signature, &FunctionClosure_));
+    Closure_privateData *internal(CYMakeFunctor_(context, function, signature, &FunctionAdapter_));
     JSObjectRef object(JSObjectMake(context, Functor_, internal));
     // XXX: see above notes about needing to leak
     JSValueProtect(CYGetJSContext(context), object);
     return object;
 }
 
+JSValueRef CYGetCachedValue(JSContextRef context, JSStringRef name) {
+    return CYGetProperty(context, CYCastJSObject(context, CYGetProperty(context, CYGetGlobalObject(context), cy_s)), name);
+}
+
 JSObjectRef CYGetCachedObject(JSContextRef context, JSStringRef name) {
-    return CYCastJSObject(context, CYGetProperty(context, CYCastJSObject(context, CYGetProperty(context, CYGetGlobalObject(context), cy_s)), name));
+    return CYCastJSObject(context, CYGetCachedValue(context, name));
 }
 
 static JSObjectRef CYMakeFunctor(JSContextRef context, JSValueRef value, const sig::Signature &signature) {
@@ -939,6 +1002,10 @@ static void Struct_getPropertyNames(JSContextRef context, JSObjectRef object, JS
     }
 }
 
+void CYCallFunction(CYPool &pool, JSContextRef context, ffi_cif *cif, void (*function)(), void *value, void **values) {
+    ffi_call(cif, function, value, values);
+}
+
 JSValueRef CYCallFunction(CYPool &pool, JSContextRef context, size_t setups, void *setup[], size_t count, const JSValueRef arguments[], bool initialize, sig::Signature *signature, ffi_cif *cif, void (*function)()) {
     if (setups + count != signature->count - 1)
         throw CYJSError(context, "incorrect number of arguments to ffi function");
@@ -957,11 +1024,13 @@ JSValueRef CYCallFunction(CYPool &pool, JSContextRef context, size_t setups, voi
 
     uint8_t value[cif->rtype->size];
 
-    if (hooks_ != NULL && hooks_->CallFunction != NULL)
-        (*hooks_->CallFunction)(context, cif, function, value, values);
-    else
-        ffi_call(cif, function, value, values);
+    void (*call)(CYPool &, JSContextRef, ffi_cif *, void (*)(), void *, void **) = &CYCallFunction;
+    // XXX: this only supports one hook, but it is a bad idea anyway
+    for (CYHook *hook : GetHooks())
+        if (hook->CallFunction != NULL)
+            call = hook->CallFunction;
 
+    call(pool, context, cif, function, value, values);
     return CYFromFFI(context, signature->elements[0].type, cif->rtype, value, initialize);
 }
 
@@ -1350,6 +1419,8 @@ static JSValueRef CYValue_callAsFunction_toCYON(JSContextRef context, JSObjectRe
 } CYCatch(NULL) }
 
 static JSValueRef Pointer_callAsFunction_toCYON(JSContextRef context, JSObjectRef object, JSObjectRef _this, size_t count, const JSValueRef arguments[], JSValueRef *exception) { CYTry {
+    std::set<void *> *objects(CYCastObjects(context, _this, count, arguments));
+
     Pointer *internal(reinterpret_cast<Pointer *>(JSObjectGetPrivate(_this)));
     if (internal->length_ != _not(size_t)) {
         JSObjectRef Array(CYGetCachedObject(context, CYJSString("Array_prototype")));
@@ -1364,7 +1435,7 @@ static JSValueRef Pointer_callAsFunction_toCYON(JSContextRef context, JSObjectRe
         if (JSValueIsUndefined(context, value))
             goto pointer;
         CYPool pool;
-        return CYCastJSValue(context, pool.strcat("&", CYPoolCCYON(pool, context, value), NULL));
+        return CYCastJSValue(context, pool.strcat("&", CYPoolCCYON(pool, context, value, objects), NULL));
     } catch (const CYException &e) {
         goto pointer;
     }
@@ -1405,7 +1476,7 @@ static JSValueRef Type_callAsFunction_toString(JSContextRef context, JSObjectRef
 static JSValueRef Type_callAsFunction_toCYON(JSContextRef context, JSObjectRef object, JSObjectRef _this, size_t count, const JSValueRef arguments[], JSValueRef *exception) { CYTry {
     Type_privateData *internal(reinterpret_cast<Type_privateData *>(JSObjectGetPrivate(_this)));
     CYLocalPool pool;
-    std::ostringstream out;
+    std::stringbuf out;
     CYOptions options;
     CYOutput output(out, options);
     (new(pool) CYEncodedType(Decode(pool, internal->type_)))->Output(output, CYNoFlags);
@@ -1479,7 +1550,7 @@ static JSStaticFunction Type_staticFunctions[14] = {
 
 static JSObjectRef (*JSObjectMakeArray$)(JSContextRef, size_t, const JSValueRef[], JSValueRef *);
 
-void CYSetArgs(int argc, const char *argv[]) {
+_visible void CYSetArgs(int argc, const char *argv[]) {
     JSContextRef context(CYGetJSContext());
     JSValueRef args[argc];
     for (int i(0); i != argc; ++i)
@@ -1502,56 +1573,65 @@ JSObjectRef CYGetGlobalObject(JSContextRef context) {
     return JSContextGetGlobalObject(context);
 }
 
+// XXX: this is neither exceptin safe nor even terribly sane
 class ExecutionHandle {
   private:
     JSContextRef context_;
-    void *handle_;
+    std::vector<void *> handles_;
 
   public:
     ExecutionHandle(JSContextRef context) :
         context_(context)
     {
-        if (hooks_ != NULL && hooks_->ExecuteStart != NULL)
-            handle_ = (*hooks_->ExecuteStart)(context_);
-        else
-            handle_ = NULL;
+        handles_.resize(GetHooks().size());
+        for (size_t i(0); i != GetHooks().size(); ++i) {
+            CYHook *hook(GetHooks()[i]);
+            if (hook->ExecuteStart != NULL)
+                handles_[i] = (*hook->ExecuteStart)(context_);
+            else
+                handles_[i] = NULL;
+        }
     }
 
     ~ExecutionHandle() {
-        if (hooks_ != NULL && hooks_->ExecuteEnd != NULL)
-            (*hooks_->ExecuteEnd)(context_, handle_);
+        for (size_t i(GetHooks().size()); i != 0; --i) {
+            CYHook *hook(GetHooks()[i-1]);
+            if (hook->ExecuteEnd != NULL)
+                (*hook->ExecuteEnd)(context_, handles_[i-1]);
+        }
     }
 };
 
-const char *CYExecute(JSContextRef context, CYPool &pool, CYUTF8String code) {
-    JSValueRef exception(NULL);
+static volatile bool cancel_;
+
+static bool CYShouldTerminate(JSContextRef context, void *arg) {
+    return cancel_;
+}
 
+_visible const char *CYExecute(JSContextRef context, CYPool &pool, CYUTF8String code) {
     ExecutionHandle handle(context);
 
-    JSValueRef result; try {
-        result = JSEvaluateScript(context, CYJSString(code), NULL, NULL, 0, &exception);
-    } catch (const char *error) {
-        return error;
-    }
+    cancel_ = false;
+    if (&JSContextGroupSetExecutionTimeLimit != NULL)
+        JSContextGroupSetExecutionTimeLimit(JSContextGetGroup(context), 0.5, &CYShouldTerminate, NULL);
 
-    if (exception != NULL) error:
-        return CYPoolCString(pool, context, CYJSString(context, exception));
+    try {
+        JSValueRef result(_jsccall(JSEvaluateScript, context, CYJSString(code), NULL, NULL, 0));
+        if (JSValueIsUndefined(context, result))
+            return NULL;
 
-    if (JSValueIsUndefined(context, result))
-        return NULL;
+        std::set<void *> objects;
+        const char *json(_jsccall(CYPoolCCYON, pool, context, result, objects));
+        CYSetProperty(context, CYGetGlobalObject(context), Result_, result);
 
-    const char *json; try {
-        json = CYPoolCCYON(pool, context, result, &exception);
-    } catch (const char *error) {
-        return error;
+        return json;
+    } catch (const CYException &error) {
+        return pool.strcat("throw ", error.PoolCString(pool), NULL);
     }
+}
 
-    if (exception != NULL)
-        goto error;
-
-    CYSetProperty(context, CYGetGlobalObject(context), Result_, result);
-
-    return json;
+_visible void CYCancel() {
+    cancel_ = true;
 }
 
 static bool initialized_ = false;
@@ -1632,11 +1712,13 @@ void CYInitializeDynamic() {
     toJSON_s = JSStringCreateWithUTF8CString("toJSON");
     toPointer_s = JSStringCreateWithUTF8CString("toPointer");
     toString_s = JSStringCreateWithUTF8CString("toString");
+    weak_s = JSStringCreateWithUTF8CString("weak");
 
     Result_ = JSStringCreateWithUTF8CString("_");
 
-    if (hooks_ != NULL && hooks_->Initialize != NULL)
-        (*hooks_->Initialize)();
+    for (CYHook *hook : GetHooks())
+        if (hook->Initialize != NULL)
+            (*hook->Initialize)();
 }
 
 void CYThrow(JSContextRef context, JSValueRef value) {
@@ -1645,8 +1727,9 @@ void CYThrow(JSContextRef context, JSValueRef value) {
 }
 
 const char *CYJSError::PoolCString(CYPool &pool) const {
+    std::set<void *> objects;
     // XXX: this used to be CYPoolCString
-    return CYPoolCCYON(pool, context_, value_);
+    return CYPoolCCYON(pool, context_, value_, objects);
 }
 
 JSValueRef CYJSError::CastJSValue(JSContextRef context) const {
@@ -1682,11 +1765,10 @@ JSGlobalContextRef CYGetJSContext(JSContextRef context) {
     return reinterpret_cast<Context *>(JSObjectGetPrivate(CYCastJSObject(context, CYGetProperty(context, CYGetGlobalObject(context), cy_s))))->context_;
 }
 
-extern "C" bool CydgetMemoryParse(const uint16_t **data, size_t *size);
-
 void *CYMapFile(const char *path, size_t *psize) {
-    int fd;
-    _syscall(fd = open(path, O_RDONLY));
+    int fd(_syscall_(open(path, O_RDONLY), 1, ENOENT));
+    if (fd == -1)
+        return NULL;
 
     struct stat stat;
     _syscall(fstat(fd, &stat));
@@ -1716,7 +1798,9 @@ static JSValueRef require(JSContextRef context, JSObjectRef object, JSObjectRef
     CYJSString property("exports");
     JSObjectRef module;
 
-    const char *path(pool.strcat(lib, "/cycript0.9/", CYPoolCString(pool, context, arguments[0]), ".cy", NULL));
+    const char *name(CYPoolCString(pool, context, arguments[0]));
+    const char *path(pool.strcat(lib, "/cycript0.9/", name, ".cy", NULL));
+
     CYJSString key(path);
     JSObjectRef modules(CYGetCachedObject(context, CYJSString("modules")));
     JSValueRef cache(CYGetProperty(context, modules, key));
@@ -1727,6 +1811,18 @@ static JSValueRef require(JSContextRef context, JSObjectRef object, JSObjectRef
         CYUTF8String code;
         code.data = reinterpret_cast<char *>(CYMapFile(path, &code.size));
 
+        if (code.data == NULL) {
+            if (strchr(name, '/') == NULL && (
+#ifdef __APPLE__
+                dlopen(pool.strcat("/System/Library/Frameworks/", name, ".framework/", name, NULL), RTLD_LAZY | RTLD_GLOBAL) != NULL ||
+                dlopen(pool.strcat("/System/Library/PrivateFrameworks/", name, ".framework/", name, NULL), RTLD_LAZY | RTLD_GLOBAL) != NULL ||
+#endif
+            false))
+                return CYJSUndefined(NULL);
+
+            CYThrow("Can't find module: %s", name);
+        }
+
         module = JSObjectMake(context, NULL, NULL);
         CYSetProperty(context, modules, key, module);
 
@@ -1747,6 +1843,9 @@ static JSValueRef require(JSContextRef context, JSObjectRef object, JSObjectRef
     return CYGetProperty(context, module, property);
 } CYCatch(NULL) }
 
+extern "C" void CYDestroyWeak(JSWeakObjectMapRef weak, void *data) {
+}
+
 extern "C" void CYSetupContext(JSGlobalContextRef context) {
     CYInitializeDynamic();
 
@@ -1771,6 +1870,9 @@ extern "C" void CYSetupContext(JSGlobalContextRef context) {
     JSObjectRef Error(CYCastJSObject(context, CYGetProperty(context, global, CYJSString("Error"))));
     CYSetProperty(context, cy, CYJSString("Error"), Error);
 
+    JSObjectRef Error_prototype(CYCastJSObject(context, CYGetProperty(context, Error, prototype_s)));
+    CYSetProperty(context, cy, CYJSString("Error_prototype"), Error_prototype);
+
     JSObjectRef Function(CYCastJSObject(context, CYGetProperty(context, global, CYJSString("Function"))));
     CYSetProperty(context, cy, CYJSString("Function"), Function);
 
@@ -1797,14 +1899,16 @@ extern "C" void CYSetupContext(JSGlobalContextRef context) {
 /* }}} */
 
     CYSetProperty(context, Array_prototype, toCYON_s, &Array_callAsFunction_toCYON, kJSPropertyAttributeDontEnum);
+    CYSetProperty(context, Error_prototype, toCYON_s, &Error_callAsFunction_toCYON, kJSPropertyAttributeDontEnum);
     CYSetProperty(context, String_prototype, toCYON_s, &String_callAsFunction_toCYON, kJSPropertyAttributeDontEnum);
 
     JSObjectRef cycript(JSObjectMake(context, NULL, NULL));
     CYSetProperty(context, global, CYJSString("Cycript"), cycript);
+    CYSetProperty(context, cycript, CYJSString("compile"), &Cycript_compile_callAsFunction);
     CYSetProperty(context, cycript, CYJSString("gc"), &Cycript_gc_callAsFunction);
 
     JSObjectRef Functor(JSObjectMakeConstructor(context, Functor_, &Functor_new));
-    JSObjectSetPrototype(context, CYCastJSObject(context, CYGetProperty(context, Functor, prototype_s)), Function_prototype);
+    CYSetPrototype(context, CYCastJSObject(context, CYGetProperty(context, Functor, prototype_s)), Function_prototype);
     CYSetProperty(context, cycript, CYJSString("Functor"), Functor);
 
     CYSetProperty(context, cycript, CYJSString("Pointer"), JSObjectMakeConstructor(context, Pointer_, &Pointer_new));
@@ -1831,11 +1935,9 @@ extern "C" void CYSetupContext(JSGlobalContextRef context) {
             next = JSObjectGetPrototype(context, curr);
         }
 
-        JSObjectSetPrototype(context, last, all);
+        CYSetPrototype(context, last, all);
     }
 
-    CYSetProperty(context, global, CYJSString("$cyq"), &$cyq, kJSPropertyAttributeDontEnum);
-
     JSObjectRef System(JSObjectMake(context, NULL, NULL));
     CYSetProperty(context, cy, CYJSString("System"), System);
 
@@ -1846,18 +1948,26 @@ extern "C" void CYSetupContext(JSGlobalContextRef context) {
     //CYSetProperty(context, System, CYJSString("global"), global);
     CYSetProperty(context, System, CYJSString("print"), &System_print);
 
+#ifdef __APPLE__
+    if (&JSWeakObjectMapCreate != NULL) {
+        JSWeakObjectMapRef weak(JSWeakObjectMapCreate(context, NULL, &CYDestroyWeak));
+        CYSetProperty(context, cy, weak_s, CYCastJSValue(context, reinterpret_cast<uintptr_t>(weak)));
+    }
+#endif
+
     if (CYBridgeEntry *entry = CYBridgeHash("1dlerror", 8))
         entry->cache_ = new cy::Functor(entry->value_, reinterpret_cast<void (*)()>(&dlerror));
 
-    if (hooks_ != NULL && hooks_->SetupContext != NULL)
-        (*hooks_->SetupContext)(context);
+    for (CYHook *hook : GetHooks())
+        if (hook->SetupContext != NULL)
+            (*hook->SetupContext)(context);
 
     CYArrayPush(context, alls, cycript);
 }
 
 static JSGlobalContextRef context_;
 
-JSGlobalContextRef CYGetJSContext() {
+_visible JSGlobalContextRef CYGetJSContext() {
     CYInitializeDynamic();
 
     if (context_ == NULL) {
@@ -1868,7 +1978,7 @@ JSGlobalContextRef CYGetJSContext() {
     return context_;
 }
 
-void CYDestroyContext() {
+_visible void CYDestroyContext() {
     if (context_ == NULL)
         return;
     JSGlobalContextRelease(context_);