X-Git-Url: https://git.saurik.com/cycript.git/blobdiff_plain/c1582939561770d8655b9378ec80de362bad89b4..5a36c6cf6ef94d7f7c6b55c8acf05e81ea0c64b3:/Tweak.mm

diff --git a/Tweak.mm b/Tweak.mm
index 268862f..0efe892 100644
--- a/Tweak.mm
+++ b/Tweak.mm
@@ -1,7 +1,8 @@
-/* Cyrker - Remove Execution Server and  Disassembler
+/* Cyrker - Remove Execution Server and Disassembler
  * Copyright (C) 2009  Jay Freeman (saurik)
 */
 
+/* Modified BSD License {{{ */
 /*
  *        Redistribution and use in source and binary
  * forms, with or without modification, are permitted
@@ -34,8 +35,16 @@
  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
+/* }}} */
 
 #include <substrate.h>
+#include "Struct.hpp"
+
+#include "sig/parse.hpp"
+#include "sig/ffi_type.hpp"
+
+#include <apr-1/apr_pools.h>
+#include <apr-1/apr_strings.h>
 
 #include <unistd.h>
 
@@ -58,20 +67,94 @@
 #include <sys/socket.h>
 #include <netinet/in.h>
 
+#undef _assert
+#undef _trace
+
 /* XXX: bad _assert */
 #define _assert(test) do { \
     if ((test)) break; \
-    CFLog(kCFLogLevelNotice, CFSTR("_assert(%u)"), __LINE__); \
+    CFLog(kCFLogLevelNotice, CFSTR("_assert(%s):%u"), #test, __LINE__); \
+    throw; \
 } while (false)
 
 #define _trace() do { \
-    CFLog(kCFLogLevelNotice, CFSTR("_trace(%u)"), __LINE__); \
+    CFLog(kCFLogLevelNotice, CFSTR("_trace():%u"), __LINE__); \
 } while (false)
 
+/* Objective-C Handle<> {{{ */
+template <typename Type_>
+class _H {
+    typedef _H<Type_> This_;
+
+  private:
+    Type_ *value_;
+
+    _finline void Retain_() {
+        if (value_ != nil)
+            [value_ retain];
+    }
+
+    _finline void Clear_() {
+        if (value_ != nil)
+            [value_ release];
+    }
+
+  public:
+    _finline _H(const This_ &rhs) :
+        value_(rhs.value_ == nil ? nil : [rhs.value_ retain])
+    {
+    }
+
+    _finline _H(Type_ *value = NULL, bool mended = false) :
+        value_(value)
+    {
+        if (!mended)
+            Retain_();
+    }
+
+    _finline ~_H() {
+        Clear_();
+    }
+
+    _finline operator Type_ *() const {
+        return value_;
+    }
+
+    _finline This_ &operator =(Type_ *value) {
+        if (value_ != value) {
+            Type_ *old(value_);
+            value_ = value;
+            Retain_();
+            if (old != nil)
+                [old release];
+        } return *this;
+    }
+};
+/* }}} */
+
+#define _pooled _H<NSAutoreleasePool> _pool([[NSAutoreleasePool alloc] init], true);
+
+void *operator new(size_t size, apr_pool_t *pool) {
+    return apr_palloc(pool, size);
+}
+
+void *operator new [](size_t size, apr_pool_t *pool) {
+    return apr_palloc(pool, size);
+}
+
 static JSContextRef Context_;
+
+static JSClassRef ffi_;
 static JSClassRef joc_;
+static JSClassRef ptr_;
+static JSClassRef sel_;
+
 static JSObjectRef Array_;
+
+static JSStringRef name_;
+static JSStringRef message_;
 static JSStringRef length_;
+
 static Class NSCFBoolean_;
 
 struct Client {
@@ -79,27 +162,51 @@ struct Client {
     CFSocketRef socket_;
 };
 
+JSObjectRef CYMakeObject(JSContextRef context, id object) {
+    return JSObjectMake(context, joc_, [object retain]);
+}
+
+@interface NSMethodSignature (Cyrver)
+- (NSString *) _typeString;
+@end
+
 @interface NSObject (Cyrver)
 - (NSString *) cy$toJSON;
+- (JSValueRef) cy$JSValueInContext:(JSContextRef)context;
 @end
 
 @implementation NSObject (Cyrver)
+
 - (NSString *) cy$toJSON {
-    return [NSString stringWithFormat:@"<%@>", [self description]];
-} @end
+    return [self description];
+}
+
+- (JSValueRef) cy$JSValueInContext:(JSContextRef)context {
+    return CYMakeObject(context, self);
+}
+
+@end
 
 @implementation WebUndefined (Cyrver)
+
 - (NSString *) cy$toJSON {
     return @"undefined";
-} @end
+}
+
+- (JSValueRef) cy$JSValueInContext:(JSContextRef)context {
+    return JSValueMakeUndefined(context);
+}
+
+@end
 
 @implementation NSArray (Cyrver)
+
 - (NSString *) cy$toJSON {
     NSMutableString *json([[[NSMutableString alloc] init] autorelease]);
     [json appendString:@"["];
 
     bool comma(false);
-    for (NSObject *object in self) {
+    for (id object in self) {
         if (comma)
             [json appendString:@","];
         else
@@ -109,18 +216,52 @@ struct Client {
 
     [json appendString:@"]"];
     return json;
-} @end
+}
+
+@end
+
+@implementation NSDictionary (Cyrver)
+
+- (NSString *) cy$toJSON {
+    NSMutableString *json([[[NSMutableString alloc] init] autorelease]);
+    [json appendString:@"("];
+    [json appendString:@"{"];
+
+    bool comma(false);
+    for (id key in self) {
+        if (comma)
+            [json appendString:@","];
+        else
+            comma = true;
+        [json appendString:[key cy$toJSON]];
+        [json appendString:@":"];
+        NSObject *object([self objectForKey:key]);
+        [json appendString:[object cy$toJSON]];
+    }
+
+    [json appendString:@"})"];
+    return json;
+}
+
+@end
 
 @implementation NSNumber (Cyrver)
+
 - (NSString *) cy$toJSON {
     return [self class] != NSCFBoolean_ ? [self stringValue] : [self boolValue] ? @"true" : @"false";
-} @end
+}
+
+- (JSValueRef) cy$JSValueInContext:(JSContextRef)context {
+    return [self class] != NSCFBoolean_ ? JSValueMakeNumber(context, [self doubleValue]) : JSValueMakeBoolean(context, [self boolValue]);
+}
+
+@end
 
 @implementation NSString (Cyrver)
+
 - (NSString *) cy$toJSON {
     CFMutableStringRef json(CFStringCreateMutableCopy(kCFAllocatorDefault, 0, (CFStringRef) self));
 
-    /* XXX: I can't believe there isn't a safe helper function for this... */
     CFStringFindAndReplace(json, CFSTR("\\"), CFSTR("\\\\"), CFRangeMake(0, CFStringGetLength(json)), 0);
     CFStringFindAndReplace(json, CFSTR("\""), CFSTR("\\\""), CFRangeMake(0, CFStringGetLength(json)), 0);
     CFStringFindAndReplace(json, CFSTR("\t"), CFSTR("\\t"), CFRangeMake(0, CFStringGetLength(json)), 0);
@@ -130,10 +271,27 @@ struct Client {
     CFStringInsert(json, 0, CFSTR("\""));
     CFStringAppend(json, CFSTR("\""));
 
-    return (NSString *) json;
-} @end
+    return [reinterpret_cast<const NSString *>(json) autorelease];
+}
+
+@end
+
+@interface CYJSObject : NSDictionary {
+    JSObjectRef object_;
+    JSContextRef context_;
+}
+
+- (id) initWithJSObject:(JSObjectRef)object inContext:(JSContextRef)context;
 
-@interface CY$JSArray : NSArray {
+- (NSUInteger) count;
+- (id) objectForKey:(id)key;
+- (NSEnumerator *) keyEnumerator;
+- (void) setObject:(id)object forKey:(id)key;
+- (void) removeObjectForKey:(id)key;
+
+@end
+
+@interface CYJSArray : NSArray {
     JSObjectRef object_;
     JSContextRef context_;
 }
@@ -145,61 +303,177 @@ struct Client {
 
 @end
 
-static id JSObjectToNSObject(JSContextRef ctx, JSObjectRef object) {
-    if (JSValueIsObjectOfClass(ctx, object, joc_))
-        return reinterpret_cast<id>(JSObjectGetPrivate(object));
-    else if (JSValueIsInstanceOfConstructor(ctx, object, Array_, NULL))
-        return [[[CY$JSArray alloc] initWithJSObject:object inContext:ctx] autorelease];
-    else
-        return @"Hello";
-        //return [[[CY$JSObject alloc] initWithJSObject:object inContext:ctx] autorelease];
+JSContextRef JSGetContext() {
+    return Context_;
 }
 
-static CFTypeRef JSValueToCFTypeCopy(JSContextRef ctx, JSValueRef value) {
-    JSType type(JSValueGetType(ctx, value));
+#define CYCatch \
+    @catch (id error) { \
+        CYThrow(context, error, exception); \
+        return NULL; \
+    }
 
-    switch (type) {
-        case kJSTypeUndefined:
-            return [WebUndefined undefined];
-        break;
+void CYThrow(JSContextRef context, JSValueRef value);
 
-        case kJSTypeNull:
-            return nil;
-        break;
+id CYCastNSObject(JSContextRef context, JSObjectRef object) {
+    if (JSValueIsObjectOfClass(context, object, joc_))
+        return reinterpret_cast<id>(JSObjectGetPrivate(object));
+    JSValueRef exception(NULL);
+    bool array(JSValueIsInstanceOfConstructor(context, object, Array_, &exception));
+    CYThrow(context, exception);
+    if (array)
+        return [[[CYJSArray alloc] initWithJSObject:object inContext:context] autorelease];
+    return [[[CYJSObject alloc] initWithJSObject:object inContext:context] autorelease];
+}
 
-        case kJSTypeBoolean:
-            return CFRetain(JSValueToBoolean(ctx, value) ? kCFBooleanTrue : kCFBooleanFalse);
-        break;
+CFStringRef CYCopyCFString(JSStringRef value) {
+    return JSStringCopyCFString(kCFAllocatorDefault, value);
+}
 
-        case kJSTypeNumber: {
-            double number(JSValueToNumber(ctx, value, NULL));
-            return CFNumberCreate(kCFAllocatorDefault, kCFNumberDoubleType, &number);
-        } break;
+CFStringRef CYCopyCFString(JSContextRef context, JSValueRef value) {
+    JSValueRef exception(NULL);
+    JSStringRef string(JSValueToStringCopy(context, value, &exception));
+    CYThrow(context, exception);
+    CFStringRef object(CYCopyCFString(string));
+    JSStringRelease(string);
+    return object;
+}
 
-        case kJSTypeString: {
-            JSStringRef string(JSValueToStringCopy(ctx, value, NULL));
-            CFStringRef object(JSStringCopyCFString(kCFAllocatorDefault, string));
-            JSStringRelease(string);
-            return object;
-        } break;
+CFNumberRef CYCopyCFNumber(JSContextRef context, JSValueRef value) {
+    JSValueRef exception(NULL);
+    double number(JSValueToNumber(context, value, &exception));
+    CYThrow(context, exception);
+    return CFNumberCreate(kCFAllocatorDefault, kCFNumberDoubleType, &number);
+}
 
-        case kJSTypeObject:
-            return CFRetain((CFTypeRef) JSObjectToNSObject(ctx, (JSObjectRef) value));
-        break;
+NSString *CYCastNSString(JSStringRef value) {
+    return [reinterpret_cast<const NSString *>(CYCopyCFString(value)) autorelease];
+}
 
+CFTypeRef CYCopyCFType(JSContextRef context, JSValueRef value) {
+    switch (JSValueGetType(context, value)) {
+        case kJSTypeUndefined:
+            return CFRetain([WebUndefined undefined]);
+        case kJSTypeNull:
+            return nil;
+        case kJSTypeBoolean:
+            return CFRetain(JSValueToBoolean(context, value) ? kCFBooleanTrue : kCFBooleanFalse);
+        case kJSTypeNumber:
+            return CYCopyCFNumber(context, value);
+        case kJSTypeString:
+            return CYCopyCFString(context, value);
+        case kJSTypeObject:
+            return CFRetain((CFTypeRef) CYCastNSObject(context, (JSObjectRef) value));
         default:
             _assert(false);
-            return NULL;
-        break;
     }
 }
 
-static id JSValueToNSObject(JSContextRef ctx, JSValueRef value) {
-    id object((id) JSValueToCFTypeCopy(ctx, value));
+NSArray *CYCastNSArray(JSPropertyNameArrayRef names) {
+    size_t size(JSPropertyNameArrayGetCount(names));
+    NSMutableArray *array([NSMutableArray arrayWithCapacity:size]);
+    for (size_t index(0); index != size; ++index)
+        [array addObject:CYCastNSString(JSPropertyNameArrayGetNameAtIndex(names, index))];
+    return array;
+}
+
+id CYCastNSObject(JSContextRef context, JSValueRef value) {
+    const NSObject *object(reinterpret_cast<const NSObject *>(CYCopyCFType(context, value)));
     return object == nil ? nil : [object autorelease];
 }
 
-@implementation CY$JSArray
+void CYThrow(JSContextRef context, JSValueRef value) {
+    if (value == NULL)
+        return;
+    @throw CYCastNSObject(context, value);
+}
+
+JSValueRef CYCastJSValue(JSContextRef context, id value) {
+    return value == nil ? JSValueMakeNull(context) : [value cy$JSValueInContext:context];
+}
+
+JSStringRef CYCopyJSString(id value) {
+    return JSStringCreateWithCFString(reinterpret_cast<CFStringRef>([value description]));
+}
+
+JSStringRef CYCopyJSString(const char *value) {
+    return JSStringCreateWithUTF8CString(value);
+}
+
+JSStringRef CYCopyJSString(JSStringRef value) {
+    return JSStringRetain(value);
+}
+
+// XXX: this is not a safe handle
+class CYString {
+  private:
+    JSStringRef string_;
+
+  public:
+    template <typename Type_>
+    CYString(Type_ value) {
+        string_ = CYCopyJSString(value);
+    }
+
+    ~CYString() {
+        JSStringRelease(string_);
+    }
+
+    operator JSStringRef() const {
+        return string_;
+    }
+};
+
+void CYThrow(JSContextRef context, id error, JSValueRef *exception) {
+    *exception = CYCastJSValue(context, error);
+}
+
+@implementation CYJSObject
+
+- (id) initWithJSObject:(JSObjectRef)object inContext:(JSContextRef)context {
+    if ((self = [super init]) != nil) {
+        object_ = object;
+        context_ = context;
+    } return self;
+}
+
+- (NSUInteger) count {
+    JSPropertyNameArrayRef names(JSObjectCopyPropertyNames(context_, object_));
+    size_t size(JSPropertyNameArrayGetCount(names));
+    JSPropertyNameArrayRelease(names);
+    return size;
+}
+
+- (id) objectForKey:(id)key {
+    JSValueRef exception(NULL);
+    JSValueRef value(JSObjectGetProperty(context_, object_, CYString(key), &exception));
+    CYThrow(context_, exception);
+    return CYCastNSObject(context_, value);
+}
+
+- (NSEnumerator *) keyEnumerator {
+    JSPropertyNameArrayRef names(JSObjectCopyPropertyNames(context_, object_));
+    NSEnumerator *enumerator([CYCastNSArray(names) objectEnumerator]);
+    JSPropertyNameArrayRelease(names);
+    return enumerator;
+}
+
+- (void) setObject:(id)object forKey:(id)key {
+    JSValueRef exception(NULL);
+    JSObjectSetProperty(context_, object_, CYString(key), CYCastJSValue(context_, object), kJSPropertyAttributeNone, &exception);
+    CYThrow(context_, exception);
+}
+
+- (void) removeObjectForKey:(id)key {
+    JSValueRef exception(NULL);
+    // XXX: this returns a bool
+    JSObjectDeleteProperty(context_, object_, CYString(key), &exception);
+    CYThrow(context_, exception);
+}
+
+@end
+
+@implementation CYJSArray
 
 - (id) initWithJSObject:(JSObjectRef)object inContext:(JSContextRef)context {
     if ((self = [super init]) != nil) {
@@ -209,20 +483,27 @@ static id JSValueToNSObject(JSContextRef ctx, JSValueRef value) {
 }
 
 - (NSUInteger) count {
-    return JSValueToNumber(context_, JSObjectGetProperty(context_, object_, length_, NULL), NULL);
+    JSValueRef exception(NULL);
+    JSValueRef value(JSObjectGetProperty(context_, object_, length_, &exception));
+    CYThrow(context_, exception);
+    double number(JSValueToNumber(context_, value, &exception));
+    CYThrow(context_, exception);
+    return number;
 }
 
 - (id) objectAtIndex:(NSUInteger)index {
-    JSValueRef value(JSObjectGetPropertyAtIndex(context_, object_, index, NULL));
-    id object(JSValueToNSObject(context_, value));
+    JSValueRef exception(NULL);
+    JSValueRef value(JSObjectGetPropertyAtIndex(context_, object_, index, &exception));
+    CYThrow(context_, exception);
+    id object(CYCastNSObject(context_, value));
     return object == nil ? [NSNull null] : object;
 }
 
 @end
 
-static CFStringRef JSValueToJSONCopy(JSContextRef ctx, JSValueRef value) {
-    id object(JSValueToNSObject(ctx, value));
-    return (CFStringRef) [(object == nil ? @"null" : [object cy$toJSON]) retain];
+CFStringRef JSValueToJSONCopy(JSContextRef context, JSValueRef value) {
+    id object(CYCastNSObject(context, value));
+    return reinterpret_cast<CFStringRef>([(object == nil ? @"null" : [object cy$toJSON]) retain]);
 }
 
 static void OnData(CFSocketRef socket, CFSocketCallBackType type, CFDataRef address, const void *value, void *info) {
@@ -248,13 +529,13 @@ static void OnData(CFSocketRef socket, CFSocketCallBackType type, CFDataRef addr
                 JSStringRef script(JSStringCreateWithCFString(code));
                 CFRelease(code);
 
-                JSValueRef result(JSEvaluateScript(Context_, script, NULL, NULL, 0, NULL));
+                JSValueRef result(JSEvaluateScript(JSGetContext(), script, NULL, NULL, 0, NULL));
                 JSStringRelease(script);
 
                 CFHTTPMessageRef response(CFHTTPMessageCreateResponse(kCFAllocatorDefault, 200, NULL, kCFHTTPVersion1_1));
                 CFHTTPMessageSetHeaderFieldValue(response, CFSTR("Content-Type"), CFSTR("application/json; charset=utf-8"));
 
-                CFStringRef json(JSValueToJSONCopy(Context_, result));
+                CFStringRef json(JSValueToJSONCopy(JSGetContext(), result));
                 CFDataRef body(CFStringCreateExternalRepresentation(kCFAllocatorDefault, json, kCFStringEncodingUTF8, NULL));
                 CFRelease(json);
 
@@ -298,19 +579,359 @@ static void OnAccept(CFSocketRef socket, CFSocketCallBackType type, CFDataRef ad
     }
 }
 
-static JSValueRef joc_getProperty(JSContextRef ctx, JSObjectRef object, JSStringRef propertyName, JSValueRef *exception) {
+static JSValueRef joc_getProperty(JSContextRef context, JSObjectRef object, JSStringRef propertyName, JSValueRef *exception) {
     return NULL;
 }
 
-static JSValueRef obc_getProperty(JSContextRef ctx, JSObjectRef object, JSStringRef propertyName, JSValueRef *exception) {
+typedef id jocData;
+
+static JSObjectRef joc_callAsConstructor(JSContextRef context, JSObjectRef object, size_t count, const JSValueRef arguments[], JSValueRef *exception) { _pooled
+    @try {
+        id data(reinterpret_cast<jocData>(JSObjectGetPrivate(object)));
+        return CYMakeObject(context, [[data alloc] autorelease]);
+    } CYCatch
+}
+
+struct ptrData {
+    apr_pool_t *pool_;
+    void *value_;
+    sig::Type type_;
+};
+
+static void ptr_finalize(JSObjectRef object) {
+    ptrData *data(reinterpret_cast<ptrData *>(JSObjectGetPrivate(object)));
+    apr_pool_destroy(data->pool_);
+}
+
+static void joc_finalize(JSObjectRef object) {
+    id data(reinterpret_cast<jocData>(JSObjectGetPrivate(object)));
+    [data release];
+}
+
+static JSValueRef obc_getProperty(JSContextRef context, JSObjectRef object, JSStringRef propertyName, JSValueRef *exception) { _pooled
     NSString *name([(NSString *) JSStringCopyCFString(kCFAllocatorDefault, propertyName) autorelease]);
     if (Class _class = NSClassFromString(name))
-        return JSObjectMake(ctx, joc_, _class);
+        return CYMakeObject(context, _class);
     return NULL;
 }
 
-extern "C" void TweakInitialize() {
-    NSAutoreleasePool *pool([[NSAutoreleasePool alloc] init]);
+void CYSetProperty(JSContextRef context, JSObjectRef object, const char *name, JSValueRef value) {
+    JSValueRef exception(NULL);
+    JSObjectSetProperty(context, object, CYString(name), value, kJSPropertyAttributeNone, &exception);
+    CYThrow(context, exception);
+}
+
+struct ffiData {
+    apr_pool_t *pool_;
+    void (*function_)();
+    const char *type_;
+    sig::Signature signature_;
+    ffi_cif cif_;
+};
+
+char *CYPoolCString(apr_pool_t *pool, JSStringRef value) {
+    size_t size(JSStringGetMaximumUTF8CStringSize(value));
+    char *string(new(pool) char[size]);
+    JSStringGetUTF8CString(value, string, size);
+    JSStringRelease(value);
+    return string;
+}
+
+// XXX: this macro is dangerous
+#define CYCastCString(context, value) ({ \
+    JSValueRef exception(NULL); \
+    JSStringRef string(JSValueToStringCopy(context, value, &exception)); \
+    CYThrow(context, exception); \
+    size_t size(JSStringGetMaximumUTF8CStringSize(string)); \
+    char *utf8(reinterpret_cast<char *>(alloca(size))); \
+    JSStringGetUTF8CString(string, utf8, size); \
+    JSStringRelease(string); \
+    utf8; \
+})
+
+SEL CYCastSEL(JSContextRef context, JSValueRef value) {
+    if (JSValueIsNull(context, value))
+        return NULL;
+    else if (JSValueIsObjectOfClass(context, value, sel_))
+        return reinterpret_cast<SEL>(JSObjectGetPrivate((JSObjectRef) value));
+    else
+        return sel_registerName(CYCastCString(context, value));
+}
+
+void *CYCastPointer(JSContextRef context, JSValueRef value) {
+    switch (JSValueGetType(context, value)) {
+        case kJSTypeNull:
+            return NULL;
+        case kJSTypeString:
+            return dlsym(RTLD_DEFAULT, CYCastCString(context, value));
+        case kJSTypeObject:
+            if (JSValueIsObjectOfClass(context, value, ptr_)) {
+                ptrData *data(reinterpret_cast<ptrData *>(JSObjectGetPrivate((JSObjectRef) value)));
+                return data->value_;
+            }
+        default:
+            JSValueRef exception(NULL);
+            double number(JSValueToNumber(context, value, &exception));
+            CYThrow(context, exception);
+            return reinterpret_cast<void *>(static_cast<uintptr_t>(number));
+    }
+}
+
+void CYPoolFFI(apr_pool_t *pool, JSContextRef context, sig::Type *type, void *data, JSValueRef value) {
+    switch (type->primitive) {
+        case sig::boolean_P:
+            *reinterpret_cast<bool *>(data) = JSValueToBoolean(context, value);
+        break;
+
+#define CYPoolFFI_(primitive, native) \
+        case sig::primitive ## _P: { \
+            JSValueRef exception(NULL); \
+            double number(JSValueToNumber(context, value, &exception)); \
+            CYThrow(context, exception); \
+            *reinterpret_cast<native *>(data) = number; \
+        } break;
+
+        CYPoolFFI_(uchar, unsigned char)
+        CYPoolFFI_(char, char)
+        CYPoolFFI_(ushort, unsigned short)
+        CYPoolFFI_(short, short)
+        CYPoolFFI_(ulong, unsigned long)
+        CYPoolFFI_(long, long)
+        CYPoolFFI_(uint, unsigned int)
+        CYPoolFFI_(int, int)
+        CYPoolFFI_(ulonglong, unsigned long long)
+        CYPoolFFI_(longlong, long long)
+        CYPoolFFI_(float, float)
+        CYPoolFFI_(double, double)
+
+        case sig::object_P:
+        case sig::typename_P:
+            *reinterpret_cast<id *>(data) = CYCastNSObject(context, value);
+        break;
+
+        case sig::selector_P:
+            *reinterpret_cast<SEL *>(data) = CYCastSEL(context, value);
+        break;
+
+        case sig::pointer_P:
+            *reinterpret_cast<void **>(data) = CYCastPointer(context, value);
+        break;
+
+        case sig::string_P: {
+            JSValueRef exception(NULL);
+            JSStringRef string(JSValueToStringCopy(context, value, &exception));
+            CYThrow(context, exception);
+            size_t size(JSStringGetMaximumUTF8CStringSize(string));
+            char *utf8(new(pool) char[size]);
+            JSStringGetUTF8CString(string, utf8, size);
+            JSStringRelease(string);
+            *reinterpret_cast<char **>(data) = utf8;
+        } break;
+
+        case sig::struct_P:
+            goto fail;
+
+        case sig::void_P:
+        break;
+
+        default: fail:
+            NSLog(@"CYPoolFFI(%c)\n", type->primitive);
+            _assert(false);
+    }
+}
+
+JSValueRef CYFromFFI(JSContextRef context, sig::Type *type, void *data) {
+    JSValueRef value;
+
+    switch (type->primitive) {
+        case sig::boolean_P:
+            value = JSValueMakeBoolean(context, *reinterpret_cast<bool *>(data));
+        break;
+
+#define CYFromFFI_(primitive, native) \
+        case sig::primitive ## _P: \
+            value = JSValueMakeNumber(context, *reinterpret_cast<native *>(data)); \
+        break;
+
+        CYFromFFI_(uchar, unsigned char)
+        CYFromFFI_(char, char)
+        CYFromFFI_(ushort, unsigned short)
+        CYFromFFI_(short, short)
+        CYFromFFI_(ulong, unsigned long)
+        CYFromFFI_(long, long)
+        CYFromFFI_(uint, unsigned int)
+        CYFromFFI_(int, int)
+        CYFromFFI_(ulonglong, unsigned long long)
+        CYFromFFI_(longlong, long long)
+        CYFromFFI_(float, float)
+        CYFromFFI_(double, double)
+
+        case sig::object_P:
+        case sig::typename_P: {
+            value = CYCastJSValue(context, *reinterpret_cast<id *>(data));
+        } break;
+
+        case sig::selector_P: {
+            SEL sel(*reinterpret_cast<SEL *>(data));
+            value = sel == NULL ? JSValueMakeNull(context) : JSObjectMake(context, sel_, sel);
+        } break;
+
+        case sig::pointer_P: {
+            if (void *pointer = *reinterpret_cast<void **>(data)) {
+                apr_pool_t *pool;
+                apr_pool_create(&pool, NULL);
+                ptrData *data(new(pool) ptrData());
+                data->pool_ = pool;
+                data->value_ = pointer;
+                value = JSObjectMake(context, ptr_, data);
+            } else value = JSValueMakeNull(context);
+        } break;
+
+        case sig::string_P: {
+            char *utf8(*reinterpret_cast<char **>(data));
+            value = utf8 == NULL ? JSValueMakeNull(context) : JSValueMakeString(context, CYString(utf8));
+        } break;
+
+        case sig::struct_P:
+            goto fail;
+
+        case sig::void_P:
+            value = NULL;
+        break;
+
+        default: fail:
+            NSLog(@"CYFromFFI(%c)\n", type->primitive);
+            _assert(false);
+    }
+
+    return value;
+}
+
+class CYPool {
+  private:
+    apr_pool_t *pool_;
+
+  public:
+    CYPool() {
+        apr_pool_create(&pool_, NULL);
+    }
+
+    ~CYPool() {
+        apr_pool_destroy(pool_);
+    }
+
+    operator apr_pool_t *() const {
+        return pool_;
+    }
+};
+
+static JSValueRef CYCallFunction(JSContextRef context, size_t count, const JSValueRef *arguments, JSValueRef *exception, sig::Signature *signature, ffi_cif *cif, void (*function)()) { _pooled
+    @try {
+        if (count != signature->count - 1)
+            [NSException raise:NSInvalidArgumentException format:@"incorrect number of arguments to ffi function"];
+
+        CYPool pool;
+        void *values[count];
+
+        for (unsigned index(0); index != count; ++index) {
+            sig::Element *element(&signature->elements[index + 1]);
+            values[index] = new(pool) uint8_t[cif->arg_types[index]->size];
+            CYPoolFFI(pool, context, element->type, values[index], arguments[index]);
+        }
+
+        uint8_t value[cif->rtype->size];
+        ffi_call(cif, function, value, values);
+
+        return CYFromFFI(context, signature->elements[0].type, value);
+    } CYCatch
+}
+
+bool stret(ffi_type *ffi_type) {
+    return ffi_type->type == FFI_TYPE_STRUCT && (
+        ffi_type->size > OBJC_MAX_STRUCT_BY_VALUE ||
+        struct_forward_array[ffi_type->size] != 0
+    );
+}
+
+static JSValueRef $objc_msgSend(JSContextRef context, JSObjectRef object, JSObjectRef _this, size_t count, const JSValueRef arguments[], JSValueRef *exception) { _pooled
+    const char *type;
+
+    @try {
+        if (count < 2)
+            [NSException raise:NSInvalidArgumentException format:@"too few arguments to objc_msgSend"];
+
+        id self(CYCastNSObject(context, arguments[0]));
+        if (self == nil)
+            return JSValueMakeNull(context);
+
+        SEL _cmd(CYCastSEL(context, arguments[1]));
+        NSMethodSignature *method([self methodSignatureForSelector:_cmd]);
+        if (method == nil)
+            [NSException raise:NSInvalidArgumentException format:@"unrecognized selector %s sent to object %p", sel_getName(_cmd), self];
+
+        type = [[method _typeString] UTF8String];
+    } CYCatch
+
+    CYPool pool;
+
+    sig::Signature signature;
+    sig::Parse(pool, &signature, type);
+
+    ffi_cif cif;
+    sig::sig_ffi_cif(pool, &sig::ObjectiveC, &signature, &cif);
+
+    void (*function)() = stret(cif.rtype) ? reinterpret_cast<void (*)()>(&objc_msgSend_stret) : reinterpret_cast<void (*)()>(&objc_msgSend);
+    return CYCallFunction(context, count, arguments, exception, &signature, &cif, function);
+}
+
+static JSValueRef ffi_callAsFunction(JSContextRef context, JSObjectRef object, JSObjectRef _this, size_t count, const JSValueRef arguments[], JSValueRef *exception) {
+    ffiData *data(reinterpret_cast<ffiData *>(JSObjectGetPrivate(object)));
+    return CYCallFunction(context, count, arguments, exception, &data->signature_, &data->cif_, data->function_);
+}
+
+static void ffi_finalize(JSObjectRef object) {
+    ffiData *data(reinterpret_cast<ffiData *>(JSObjectGetPrivate(object)));
+    apr_pool_destroy(data->pool_);
+}
+
+JSObjectRef CYMakeFunction(JSContextRef context, void (*function)(), const char *type) {
+    apr_pool_t *pool;
+    apr_pool_create(&pool, NULL);
+
+    ffiData *data(new(pool) ffiData());
+
+    data->pool_ = pool;
+    data->function_ = function;
+    data->type_ = apr_pstrdup(pool, type);
+
+    sig::Parse(pool, &data->signature_, type);
+    sig::sig_ffi_cif(pool, &sig::ObjectiveC, &data->signature_, &data->cif_);
+
+    return JSObjectMake(context, ffi_, data);
+}
+
+JSObjectRef ffi(JSContextRef context, JSObjectRef object, size_t count, const JSValueRef arguments[], JSValueRef *exception) {
+    @try {
+        if (count != 2)
+            [NSException raise:NSInvalidArgumentException format:@"incorrect number of arguments to ffi constructor"];
+        void (*function)() = reinterpret_cast<void (*)()>(CYCastPointer(context, arguments[0]));
+        const char *type(CYCastCString(context, arguments[1]));
+        return CYMakeFunction(context, function, type);
+    } CYCatch
+}
+
+JSValueRef ptr_getProperty_value(JSContextRef context, JSObjectRef object, JSStringRef name, JSValueRef *exception) {
+    ptrData *data(reinterpret_cast<ptrData *>(JSObjectGetPrivate(object)));
+    return JSValueMakeNumber(context, reinterpret_cast<uintptr_t>(data->value_));
+}
+
+static JSStaticValue ptr_staticValues[2] = {
+    {"value", &ptr_getProperty_value, NULL, kJSPropertyAttributeReadOnly | kJSPropertyAttributeDontDelete},
+    {NULL, NULL, NULL, 0}
+};
+
+MSInitialize { _pooled
+    apr_initialize();
 
     NSCFBoolean_ = objc_getClass("NSCFBoolean");
 
@@ -340,18 +961,131 @@ extern "C" void TweakInitialize() {
     JSClassRef obc(JSClassCreate(&definition));
 
     definition = kJSClassDefinitionEmpty;
-    definition.getProperty = &joc_getProperty;
-    joc_ = JSClassCreate(&definition);
+    definition.className = "ffi";
+    definition.callAsFunction = &ffi_callAsFunction;
+    definition.finalize = &ffi_finalize;
+    ffi_ = JSClassCreate(&definition);
 
-    Context_ = JSGlobalContextCreate(obc);
+    definition = kJSClassDefinitionEmpty;
+    definition.className = "ptr";
+    definition.staticValues = ptr_staticValues;
+    definition.finalize = &ptr_finalize;
+    ptr_ = JSClassCreate(&definition);
 
-    JSObjectRef global(JSContextGetGlobalObject(Context_));
+    definition = kJSClassDefinitionEmpty;
+    definition.className = "sel";
+    sel_ = JSClassCreate(&definition);
 
-    length_ = JSStringCreateWithUTF8CString("length");
+    definition = kJSClassDefinitionEmpty;
+    definition.className = "joc";
+    definition.getProperty = &joc_getProperty;
+    definition.callAsConstructor = &joc_callAsConstructor;
+    definition.finalize = &joc_finalize;
+    joc_ = JSClassCreate(&definition);
 
-    JSStringRef name(JSStringCreateWithUTF8CString("Array"));
-    Array_ = JSValueToObject(Context_, JSObjectGetProperty(Context_, global, name, NULL), NULL);
-    JSStringRelease(name);
+    JSContextRef context(JSGlobalContextCreate(obc));
+    Context_ = context;
+
+    JSObjectRef global(JSContextGetGlobalObject(context));
+
+    CYSetProperty(context, global, "ffi", JSObjectMakeConstructor(context, ffi_, &ffi));
+    CYSetProperty(context, global, "obc", JSObjectMake(context, obc, NULL));
+
+#define CYSetFunction_(name, type) \
+    CYSetProperty(context, global, #name, CYMakeFunction(context, reinterpret_cast<void (*)()>(&name), type))
+
+    CYSetFunction_(class_addIvar, "B#*LC*");
+    CYSetFunction_(class_addMethod, "B#:^?*");
+    CYSetFunction_(class_addProtocol, "B#@");
+    CYSetFunction_(class_conformsToProtocol, "B#@");
+    CYSetFunction_(class_copyIvarList, "^^{objc_ivar=}#^I");
+    CYSetFunction_(class_copyMethodList, "^^{objc_method=}#^I");
+    CYSetFunction_(class_copyPropertyList, "^^{objc_property=}#^I");
+    CYSetFunction_(class_copyProtocolList, "^@#^I");
+    CYSetFunction_(class_createInstance, "@#L");
+    CYSetFunction_(class_getClassMethod, "^{objc_method=}#:");
+    CYSetFunction_(class_getClassVariable, "^{objc_ivar=}#*");
+    CYSetFunction_(class_getInstanceMethod, "^{objc_method=}#:");
+    CYSetFunction_(class_getInstanceSize, "L#");
+    CYSetFunction_(class_getInstanceVariable, "^{objc_ivar=}#*");
+    CYSetFunction_(class_getIvarLayout, "*#");
+    CYSetFunction_(class_getMethodImplementation, "^?#:");
+    CYSetFunction_(class_getMethodImplementation_stret, "^?#:");
+    CYSetFunction_(class_getName, "*#");
+    CYSetFunction_(class_getProperty, "^{objc_property=}#*");
+    CYSetFunction_(class_getSuperclass, "##");
+    CYSetFunction_(class_getVersion, "i#");
+    CYSetFunction_(class_getWeakIvarLayout, "*#");
+    CYSetFunction_(class_isMetaClass, "B#");
+    CYSetFunction_(class_replaceMethod, "^?#:^?*");
+    CYSetFunction_(class_respondsToSelector, "B#:");
+    CYSetFunction_(class_setIvarLayout, "v#*");
+    CYSetFunction_(class_setSuperclass, "###");
+    CYSetFunction_(class_setVersion, "v#i");
+    CYSetFunction_(class_setWeakIvarLayout, "v#*");
+    CYSetFunction_(ivar_getName, "*^{objc_ivar=}");
+    CYSetFunction_(ivar_getOffset, "i^{objc_ivar=}");
+    CYSetFunction_(ivar_getTypeEncoding, "*^{objc_ivar=}");
+    CYSetFunction_(method_copyArgumentType, "^c^{objc_method=}I");
+    CYSetFunction_(method_copyReturnType, "^c^{objc_method=}");
+    CYSetFunction_(method_exchangeImplementations, "v^{objc_method=}^{objc_method=}");
+    CYSetFunction_(method_getArgumentType, "v^{objc_method=}I^cL");
+    CYSetFunction_(method_getImplementation, "^?^{objc_method=}");
+    CYSetFunction_(method_getName, ":^{objc_method=}");
+    CYSetFunction_(method_getNumberOfArguments, "I^{objc_method=}");
+    CYSetFunction_(method_getReturnType, "v^{objc_method=}^cL");
+    CYSetFunction_(method_getTypeEncoding, "*^{objc_method=}");
+    CYSetFunction_(method_setImplementation, "^?^{objc_method=}^?");
+    CYSetFunction_(objc_allocateClassPair, "##*L");
+    CYSetFunction_(objc_copyProtocolList, "^@^I");
+    CYSetFunction_(objc_duplicateClass, "##*L");
+    CYSetFunction_(objc_getClass, "#*");
+    CYSetFunction_(objc_getClassList, "i^#i");
+    CYSetFunction_(objc_getFutureClass, "#*");
+    CYSetFunction_(objc_getMetaClass, "@*");
+    CYSetFunction_(objc_getProtocol, "@*");
+    CYSetFunction_(objc_getRequiredClass, "@*");
+    CYSetFunction_(objc_lookUpClass, "@*");
+    CYSetFunction_(objc_registerClassPair, "v#");
+    CYSetFunction_(objc_setFutureClass, "v#*");
+    CYSetFunction_(object_copy, "@@L");
+    CYSetFunction_(object_dispose, "@@");
+    CYSetFunction_(object_getClass, "#@");
+    CYSetFunction_(object_getClassName, "*@");
+    CYSetFunction_(object_getIndexedIvars, "^v@");
+    CYSetFunction_(object_getInstanceVariable, "^{objc_ivar=}@*^^v");
+    CYSetFunction_(object_getIvar, "@@^{objc_ivar=}");
+    CYSetFunction_(object_setClass, "#@#");
+    CYSetFunction_(object_setInstanceVariable, "^{objc_ivar=}@*^v");
+    CYSetFunction_(object_setIvar, "v@^{objc_ivar=}@");
+    CYSetFunction_(property_getAttributes, "*^{objc_property=}");
+    CYSetFunction_(property_getName, "*^{objc_property=}");
+    CYSetFunction_(protocol_conformsToProtocol, "B@@");
+    CYSetFunction_(protocol_copyMethodDescriptionList, "^{objc_method_description=:*}@BB^I");
+    CYSetFunction_(protocol_copyPropertyList, "^{objc_property=}@^I");
+    CYSetFunction_(protocol_copyProtocolList, "^@@^I");
+    CYSetFunction_(protocol_getMethodDescription, "{objc_method_description=:*}@:BB");
+    CYSetFunction_(protocol_getName, "*@");
+    CYSetFunction_(protocol_getProperty, "^{objc_property=}@*BB");
+    CYSetFunction_(protocol_isEqual, "B@@");
+    CYSetFunction_(sel_getName, "*:");
+    CYSetFunction_(sel_getUid, ":*");
+    CYSetFunction_(sel_isEqual, "B::");
+    CYSetFunction_(sel_registerName, ":*");
+
+    CYSetProperty(context, global, "objc_msgSend", JSObjectMakeFunctionWithCallback(context, CYString("objc_msgSend"), &$objc_msgSend));
+
+    CYSetProperty(context, global, "YES", JSValueMakeBoolean(context, true));
+    CYSetProperty(context, global, "NO", JSValueMakeBoolean(context, false));
+    CYSetProperty(context, global, "nil", JSValueMakeNull(context));
+
+    name_ = JSStringCreateWithUTF8CString("name");
+    message_ = JSStringCreateWithUTF8CString("message");
+    length_ = JSStringCreateWithUTF8CString("length");
 
-    [pool release];
+    JSValueRef exception(NULL);
+    JSValueRef value(JSObjectGetProperty(JSGetContext(), global, CYString("Array"), &exception));
+    CYThrow(context, exception);
+    Array_ = JSValueToObject(JSGetContext(), value, &exception);
+    CYThrow(context, exception);
 }