Added Objective-C mapping

4 files changed, 3646 insertions, 0 deletions

diff --git a/cpp/src/slice2objc/Gen.cpp b/cpp/src/slice2objc/Gen.cpp
new file mode 100644
index 00000000000..763f3f5661a
--- /dev/null
+++ b/cpp/src/slice2objc/Gen.cpp
@@ -0,0 +1,3139 @@
+// **********************************************************************
+//
+// Copyright (c) 2003-2014 ZeroC, Inc. All rights reserved.
+//
+// This copy of Ice is licensed to you under the terms described in the
+// ICE_LICENSE file included in this distribution.
+//
+// **********************************************************************
+
+#include <IceUtil/DisableWarnings.h>
+#include <IceUtil/Functional.h>
+#include <Gen.h>
+#include <limits>
+#include <sys/stat.h>
+#ifndef _WIN32
+#include <unistd.h>
+#else
+#include <direct.h>
+#endif
+#include <IceUtil/Iterator.h>
+#include <IceUtil/UUID.h>
+#include <Slice/Checksum.h>
+#include <Slice/FileTracker.h>
+#include <Slice/Util.h>
+#include <string.h>
+
+using namespace std;
+using namespace Slice;
+using namespace IceUtilInternal;
+
+namespace
+{
+
+string
+sliceModeToIceMode(Operation::Mode opMode)
+{
+    string mode;
+    switch(opMode)
+    {
+        case Operation::Normal:
+        {
+            mode = "ICENormal";
+            break;
+        }
+        case Operation::Nonmutating:
+        {
+            mode = "ICENonmutating";
+            break;
+        }
+        case Operation::Idempotent:
+        {
+            mode = "ICEIdempotent";
+            break;
+        }
+        default:
+        {
+            assert(false);
+            break;
+        }
+    }
+    return mode;
+}
+
+string
+opFormatTypeToString(const OperationPtr& op)
+{
+    switch(op->format())
+    {
+        case DefaultFormat:
+        {
+            return "ICEDefaultFormat";
+            break;
+        }
+        case CompactFormat:
+        {
+            return "ICECompactFormat";
+            break;
+        }
+        case SlicedFormat:
+        {
+            return "ICESlicedFormat";
+            break;
+        }
+        default:
+        {
+            assert(false);
+        }
+    }
+
+    return "???";
+}
+
+class SortParamDeclByTagFn
+{
+public:
+
+    static bool compare(const ParamDeclPtr& lhs, const ParamDeclPtr& rhs)
+    {
+        return lhs->tag() < rhs->tag();
+    }
+};
+
+}
+
+Slice::ObjCVisitor::ObjCVisitor(Output& h, Output& m) : _H(h), _M(m)
+{
+}
+
+Slice::ObjCVisitor::~ObjCVisitor()
+{
+}
+
+void
+Slice::ObjCVisitor::writeMarshalUnmarshalParams(const ParamDeclList& params, const OperationPtr& op, bool marshal, 
+                                                bool reference)
+{
+    ParamDeclList optionals;
+    for(ParamDeclList::const_iterator p = params.begin(); p != params.end(); ++p)
+    {
+        if((*p)->optional())
+        {
+            optionals.push_back(*p);
+        }
+        else
+        {
+            string name = reference ? "*" + fixId((*p)->name()) : fixId((*p)->name());
+            writeMarshalUnmarshalCode(_M, (*p)->type(), name, marshal, true);
+        }
+    }
+    if(op && op->returnType())
+    {
+        if(!op->returnIsOptional())
+        {
+            writeMarshalUnmarshalCode(_M, op->returnType(), "ret_", marshal, true);
+        }
+    }
+
+    optionals.sort(SortParamDeclByTagFn::compare);
+    bool checkReturnType = op && op->returnIsOptional();
+    for(ParamDeclList::const_iterator p = optionals.begin(); p != optionals.end(); ++p)
+    {
+        if(checkReturnType && op->returnTag() < (*p)->tag())
+        {
+            writeOptParamMarshalUnmarshalCode(_M, op->returnType(), "ret_", op->returnTag(), marshal);
+            checkReturnType = false;
+        }
+        string name = reference ? "*" + fixId((*p)->name()) : fixId((*p)->name());
+        writeOptParamMarshalUnmarshalCode(_M, (*p)->type(), name, (*p)->tag(), marshal);
+    }
+    if(checkReturnType)
+    {
+        writeOptParamMarshalUnmarshalCode(_M, op->returnType(), "ret_", op->returnTag(), marshal);
+    }
+}
+
+void
+Slice::ObjCVisitor::writeDispatchAndMarshalling(const ClassDefPtr& p)
+{
+    string name = fixName(p);
+    string scoped = p->scoped();
+    ClassList allBases = p->allBases();
+    StringList ids;
+
+    transform(allBases.begin(), allBases.end(), back_inserter(ids), ::IceUtil::constMemFun(&Contained::scoped));
+
+    StringList other;
+    other.push_back(p->scoped());
+    other.push_back("::Ice::Object");
+    other.sort();
+    ids.merge(other);
+    ids.unique();
+
+    StringList::const_iterator firstIter = ids.begin();
+    StringList::const_iterator scopedIter = find(ids.begin(), ids.end(), scoped);
+    assert(scopedIter != ids.end());
+    StringList::difference_type scopedPos = IceUtilInternal::distance(firstIter, scopedIter);
+    
+    _M << sp << nl << "static NSString *" << name << "_ids__[] = ";
+    _M << sb;
+    {
+        StringList::const_iterator q = ids.begin();
+        while(q != ids.end())
+        {
+            _M << nl << "@\"" << *q << '"';
+            if(++q != ids.end())
+            {
+                _M << ',';
+            }
+        }
+    }
+    _M << eb << ";";
+
+    OperationList ops = p->operations();
+    OperationList::const_iterator r;
+    for(r = ops.begin(); r != ops.end(); ++r)
+    {
+        OperationPtr op = *r;
+        ContainerPtr container = op->container();
+        ClassDefPtr cl = ClassDefPtr::dynamicCast(container);
+        assert(cl);
+
+        string opName = getName(op);
+        _M << sp << nl << "+(BOOL)" << op->name() << "___:(id<" << name << ">)target_ current:(ICECurrent *)current " 
+           << "is:(id<ICEInputStream>)is_ os:(id<ICEOutputStream>)os_";
+        _M << sb;
+
+        _M << nl << "ICEInternalCheckModeAndSelector(target_, " << sliceModeToIceMode(op->mode()) << ", @selector(";
+        string selector = getSelector(op);
+        if(!selector.empty())
+        {
+            _M << selector << "current:";
+        }
+        else
+        {
+            _M << opName << ":";
+        }
+        _M << "), current);";
+
+        _M << nl << "ICEEncodingVersion* encoding = [is_ startEncapsulation];";
+        ParamDeclList inParams;
+        ParamDeclList outParams;
+        ParamDeclList paramList = op->parameters();
+        for(ParamDeclList::const_iterator pli = paramList.begin(); pli != paramList.end(); ++pli)
+        {
+            if(!(*pli)->isOutParam())
+            {
+                inParams.push_back(*pli);
+            }
+            else
+            {
+                outParams.push_back(*pli);
+            }
+        }
+        ExceptionList throws = op->throws();
+        throws.sort();
+        throws.unique();
+        throws.sort(Slice::DerivedToBaseCompare());
+
+        for(ParamDeclList::const_iterator inp = inParams.begin(); inp != inParams.end(); ++inp)
+        {
+            TypePtr type = (*inp)->type();
+            string name = (*inp)->name();
+            _M << nl << outTypeToString(type, (*inp)->optional(), true) << " " << fixId(name);
+            if(!isValueType(type))
+            {
+                _M << " = nil";
+            }
+            _M << ";";
+        }
+        writeMarshalUnmarshalParams(inParams, 0, false);
+        if(op->sendsClasses(false))
+        {
+            _M << nl << "[is_ readPendingObjects];";
+        }
+        _M << nl << "[is_ endEncapsulation];";
+        if(!throws.empty())
+        {
+            _M << nl << "@try";
+            _M << sb;
+        }
+        for(ParamDeclList::const_iterator outp = outParams.begin(); outp != outParams.end(); ++outp)
+        {
+            TypePtr type = (*outp)->type();
+            string name = (*outp)->name();
+            _M << nl << inTypeToString(type, (*outp)->optional(), true) << " " << fixId(name);
+            if((*outp)->optional())
+            {
+                _M << " = ICENone";
+            }
+            _M << ";";
+        }
+        _M << nl << "[os_ startEncapsulation:encoding format:" << opFormatTypeToString(*r) << "];"; 
+        TypePtr returnType = op->returnType();
+        if(returnType)
+        {
+            _M << nl << inTypeToString(returnType, op->returnIsOptional(), true) << " ret_ = ";
+        }
+        else
+        {
+            _M << nl;
+        }
+        string args = getServerArgs(op);
+        _M << "[target_ " << opName << args;
+        if(!args.empty())
+        {
+            _M << " current";
+        }
+        _M << ":current];";
+        writeMarshalUnmarshalParams(outParams, op, true);
+        if(op->returnsClasses(false))
+        {
+            _M << nl << "[os_ writePendingObjects];";
+        }
+        if(!throws.empty())
+        {
+            _M << eb;
+            ExceptionList::const_iterator t;
+            for(t = throws.begin(); t != throws.end(); ++t)
+            {
+                string exS = fixName(*t);
+                _M << nl << "@catch(" << exS << " *ex)";
+                _M << sb;
+                _M << nl << "[os_ writeException:ex];";
+                _M << nl << "return NO;";
+                _M << eb;
+            }
+            _M << nl << "@finally";
+            _M << sb;
+            _M << nl << "[os_ endEncapsulation];";
+            _M << eb;
+        }
+        else
+        {
+            _M << nl << "[os_ endEncapsulation];";
+        }
+        _M << nl << "return YES;";
+        _M << eb;
+    }
+
+    OperationList allOps = p->allOperations();
+    if(!allOps.empty())
+    {
+        map<string, string> allOpNames;
+        for(OperationList::const_iterator p = allOps.begin(); p != allOps.end(); ++p)
+        {
+            allOpNames.insert(make_pair((*p)->name(), fixName(ClassDefPtr::dynamicCast((*p)->container()))));
+        }
+
+        allOpNames["ice_id"] = "ICEObject";
+        allOpNames["ice_ids"] = "ICEObject";
+        allOpNames["ice_isA"] = "ICEObject";
+        allOpNames["ice_ping"] = "ICEObject";
+
+        map<string, string>::const_iterator q;
+
+        _M << sp << nl << "static NSString *" << name << "_all__[] =";
+        _M << sb;
+        q = allOpNames.begin();
+        while(q != allOpNames.end())
+        {
+            _M << nl << "@\"" << q->first << '"';
+            if(++q != allOpNames.end())
+            {
+                _M << ',';
+            }
+        }
+        _M << eb << ';';
+
+        _M << sp << nl << "-(BOOL) dispatch__:(ICECurrent *)current is:(id<ICEInputStream>)is "
+           << "os:(id<ICEOutputStream>)os";
+        _M << sb;
+        _M << nl << "id target__ = [self target__];";
+        _M << nl << "switch(ICEInternalLookupString(" << name << "_all__, sizeof(" << name
+           << "_all__) / sizeof(NSString*), current.operation))";
+        _M << sb;
+        int i = 0;
+        for(q = allOpNames.begin(); q != allOpNames.end(); ++q)
+        {
+            _M << nl << "case " << i++ << ':';
+            _M.inc();
+            string target = (q->second == "ICEObject") ? "self" : "target__";
+            _M << nl << "return [" << q->second << " " << q->first << "___:(id<" << q->second
+               << ">)" << target << " current:current is:is os:os];";
+            _M.dec();
+        }
+        _M << nl << "default:";
+        _M.inc();
+        _M << nl << "@throw [ICEOperationNotExistException operationNotExistException:";
+        _M.useCurrentPosAsIndent();
+        _M << "__FILE__";
+        _M << nl << "line:__LINE__";
+        _M << nl << "id_:current.id_";
+        _M << nl << "facet:current.facet";
+        _M << nl << "operation:current.operation];";
+        _M.restoreIndent();
+        _M.dec();
+        _M << eb;
+        _M << eb;
+    }
+
+    _M << sp << nl << "+(NSString * const*) staticIds__:(int*)count idIndex:(int*)idx";
+    _M << sb;
+    _M << nl << "*count = sizeof(" << name << "_ids__) / sizeof(NSString *);";
+    _M << nl << "*idx = " << scopedPos << ";";
+    _M << nl << "return " << name << "_ids__;";
+    _M << eb;
+}
+
+string
+Slice::ObjCVisitor::getName(const OperationPtr& op) const
+{
+    if(!op->parameters().empty())
+    {
+        return fixId(op->name(), BaseTypeNone);
+    }
+    else
+    {
+        return fixId(op->name(), BaseTypeObject);
+    }
+}
+
+string
+Slice::ObjCVisitor::getSelector(const OperationPtr& op) const
+{
+    string result;
+    ParamDeclList paramList = op->parameters();
+    for(ParamDeclList::const_iterator q = paramList.begin(); q != paramList.end(); ++q)
+    {
+        if(q == paramList.begin())
+        {
+            result += getName(op) + ":";
+        }
+        else
+        {
+            result += fixId((*q)->name()) + ":";
+        }
+    }
+    return result;
+}
+
+string
+Slice::ObjCVisitor::getParams(const OperationPtr& op) const
+{
+    string result;
+    ParamDeclList paramList = op->parameters();
+    for(ParamDeclList::const_iterator q = paramList.begin(); q != paramList.end(); ++q)
+    {
+        TypePtr type = (*q)->type();
+        string typeString;
+        if((*q)->isOutParam())
+        {
+            typeString = outTypeToString(type, (*q)->optional(), false, true);
+        }
+        else
+        {
+            typeString = inTypeToString(type, (*q)->optional());
+        }
+        string name = fixId((*q)->name());
+        if(q != paramList.begin())
+        {
+            result += " " + name;
+        }
+        result += ":(" + typeString + ")" + name;
+    }
+    return result;
+}
+
+string
+Slice::ObjCVisitor::getMarshalParams(const OperationPtr& op) const
+{
+    ParamDeclList paramList = op->parameters();
+    string result;
+    for(ParamDeclList::const_iterator q = paramList.begin(); q != paramList.end(); ++q)
+    {
+        if(!(*q)->isOutParam())
+        {
+            TypePtr type = (*q)->type();
+            string name = fixId((*q)->name());
+            if(!result.empty())
+            {
+                result += " " + name;
+            }
+            result += ":(" + inTypeToString(type, (*q)->optional()) + ")" + name;
+        }
+    }
+    return result;
+}
+
+string
+Slice::ObjCVisitor::getUnmarshalParams(const OperationPtr& op) const
+{
+    string result;
+    ParamDeclList paramList = op->parameters();
+    for(ParamDeclList::const_iterator q = paramList.begin(); q != paramList.end(); ++q)
+    {
+        if((*q)->isOutParam())
+        {
+            TypePtr type = (*q)->type();
+            string name = fixId((*q)->name());
+            if(!result.empty())
+            {
+                result += " " + name;
+            }
+            result += ":(" + outTypeToString(type, (*q)->optional(), false, true) + ")" + name;
+        }
+    }
+    return result;
+}
+
+string
+Slice::ObjCVisitor::getServerParams(const OperationPtr& op) const
+{
+    string result;
+    ParamDeclList paramList = op->parameters();
+    for(ParamDeclList::const_iterator q = paramList.begin(); q != paramList.end(); ++q)
+    {
+        TypePtr type = (*q)->type();
+        string typeString;
+        if((*q)->isOutParam())
+        {
+            typeString = inTypeToString(type, (*q)->optional(), false, true);
+        }
+        else
+        {
+            typeString = outTypeToString(type, (*q)->optional());
+        }
+        string name = fixId((*q)->name());
+        if(q != paramList.begin())
+        {
+            result += " " + name;
+        }
+        result += ":(" + typeString + ")" + name;
+    }
+    return result;
+}
+
+string
+Slice::ObjCVisitor::getResponseCBSig(const OperationPtr& op) const
+{
+    string result;
+    TypePtr returnType = op->returnType();
+    if(returnType)
+    {
+        result = outTypeToString(returnType, op->returnIsOptional());
+    }
+
+    ParamDeclList paramList = op->parameters();
+    for(ParamDeclList::const_iterator q = paramList.begin(); q != paramList.end(); ++q)
+    {
+        if((*q)->isOutParam())
+        {
+            TypePtr type = (*q)->type();
+            string name = fixId((*q)->name());
+            if(!result.empty())
+            {
+                result += ", ";
+            }
+            result += outTypeToString(type, (*q)->optional());
+        }
+    }
+    return "void(^)(" + result + ")";
+}
+
+string
+Slice::ObjCVisitor::getArgs(const OperationPtr& op) const
+{
+    string result;
+    ParamDeclList paramList = op->parameters();
+    for(ParamDeclList::const_iterator q = paramList.begin(); q != paramList.end(); ++q)
+    {
+        string name = fixId((*q)->name());
+        if(q != paramList.begin())
+        {
+            result += " " + name;
+        }
+        result += ":" + name;
+    }
+    return result;
+}
+
+string
+Slice::ObjCVisitor::getMarshalArgs(const OperationPtr& op) const
+{
+    string result;
+    ParamDeclList paramList = op->parameters();
+    for(ParamDeclList::const_iterator q = paramList.begin(); q != paramList.end(); ++q)
+    {
+        if(!(*q)->isOutParam())
+        {
+            string name = fixId((*q)->name());
+            if(!result.empty())
+            {
+                result += " " + name;
+            }
+            result += ":" + name;
+        }
+    }
+    return result;
+}
+
+string
+Slice::ObjCVisitor::getUnmarshalArgs(const OperationPtr& op) const
+{
+    string result;
+    ParamDeclList paramList = op->parameters();
+    for(ParamDeclList::const_iterator q = paramList.begin(); q != paramList.end(); ++q)
+    {
+        if((*q)->isOutParam())
+        {
+            string name = fixId((*q)->name());
+            if(!result.empty())
+            {
+                result += " " + name;
+            }
+            result += ":" + name;
+        }
+    }
+    return result;
+}
+
+string
+Slice::ObjCVisitor::getServerArgs(const OperationPtr& op) const
+{
+    string result;
+    ParamDeclList paramList = op->parameters();
+    for(ParamDeclList::const_iterator q = paramList.begin(); q != paramList.end(); ++q)
+    {
+        string name = fixId((*q)->name());
+        if(q != paramList.begin())
+        {
+            result += " " + name;
+        }
+        result += ":";
+        if((*q)->isOutParam())
+        {
+            result += "&";
+        }
+        result += name;
+    }
+    return result;
+}
+
+Slice::Gen::Gen(const string& name, const string& base, const string& include, const vector<string>& includePaths,
+                const string& dir)
+    : _base(base),
+      _include(include),
+      _includePaths(includePaths)
+{
+    for(vector<string>::iterator p = _includePaths.begin(); p != _includePaths.end(); ++p)
+    {
+        *p = fullPath(*p);
+    }
+
+    string::size_type pos = _base.find_last_of("/\\");
+    if(pos != string::npos)
+    {
+        _base.erase(0, pos + 1);
+    }
+
+    string fileH = _base + ".h";
+    string fileM = _base + ".m";
+    string fileImplH = _base + "I.h";
+    string fileImplM = _base + "I.m";
+
+    if(!dir.empty())
+    {
+        fileH = dir + '/' + fileH;
+        fileM = dir + '/' + fileM;
+        fileImplH = dir + '/' + fileImplH;
+        fileImplM = dir + '/' + fileImplM;
+    }
+
+    _H.open(fileH.c_str());
+    if(!_H)
+    {
+        ostringstream os;
+        os << "cannot open `" << fileH << "': " << strerror(errno);
+        throw FileException(__FILE__, __LINE__, os.str());
+    }
+    FileTracker::instance()->addFile(fileH);
+    printHeader(_H);
+    _H << nl << "// Generated from file `" << _base << ".ice'";
+
+    _H << sp << nl << "#import <objc/Ice/Config.h>";
+    _H << nl << "#import <objc/Ice/Proxy.h>";
+    _H << nl << "#import <objc/Ice/Object.h>";
+    _H << nl << "#import <objc/Ice/Current.h>";
+    _H << nl << "#import <objc/Ice/Exception.h>";
+    _H << nl << "#import <objc/Ice/Stream.h>";
+
+    _M.open(fileM.c_str());
+    if(!_M)
+    {
+        ostringstream os;
+        os << "cannot open `" << fileM << "': " << strerror(errno);
+        throw FileException(__FILE__, __LINE__, os.str());
+    }
+    FileTracker::instance()->addFile(fileM);
+    printHeader(_M);
+    _M << nl << "// Generated from file `" << _base << ".ice'";
+}
+
+Slice::Gen::~Gen()
+{
+    if(_H.isOpen())
+    {
+        _H << '\n';
+        _M << '\n';
+    }
+}
+
+bool
+Slice::Gen::operator!() const
+{
+    if(!_H || !_M)
+    {
+        return true;
+    }
+    return false;
+}
+
+void
+Slice::Gen::generate(const UnitPtr& p)
+{
+    ObjCGenerator::validateMetaData(p);
+
+    _M << nl << "\n#import <objc/Ice/LocalException.h>";
+    _M << nl << "#import <objc/Ice/Stream.h>";
+    if(p->hasContentsWithMetaData("preserve-slice"))
+    {
+        _H << "\n#import <objc/Ice/SlicedData.h>";
+    }
+    _M << nl << "#import <";
+    if(!_include.empty())
+    {
+        _M << _include << "/";
+    }
+    _M << _base << ".h>";
+
+    // Necessary for objc_getClass use when marshalling/unmarshalling proxies.
+    _M << nl << "#import <objc/runtime.h>";
+
+    _M << nl;
+
+    StringList includes = p->includeFiles();
+    for(StringList::const_iterator q = includes.begin(); q != includes.end(); ++q)
+    {
+        static const string headerDirPrefix = "objc:header-dir:";
+        DefinitionContextPtr dc = p->findDefinitionContext(*q);
+        assert(dc);
+        string meta = dc->findMetaData(headerDirPrefix);
+        string headerDir;
+        if(meta.size() > headerDirPrefix.size())
+        {
+            headerDir = meta.substr(headerDirPrefix.size());
+        }
+        _H << "\n#import <";
+        if(!headerDir.empty())
+        {
+            _H << headerDir << "/";
+        }
+        _H << changeInclude(*q, _includePaths) << ".h>";
+    }
+
+    UnitVisitor unitVisitor(_H, _M);
+    p->visit(&unitVisitor, false);
+
+    ObjectDeclVisitor objectDeclVisitor(_H, _M);
+    p->visit(&objectDeclVisitor, false);
+
+    ProxyDeclVisitor proxyDeclVisitor(_H, _M);
+    p->visit(&proxyDeclVisitor, false);
+
+    TypesVisitor typesVisitor(_H, _M);
+    p->visit(&typesVisitor, false);
+
+    ProxyVisitor proxyVisitor(_H, _M);
+    p->visit(&proxyVisitor, false);
+
+    DelegateMVisitor delegateMVisitor(_H, _M);
+    p->visit(&delegateMVisitor, false);
+
+    HelperVisitor HelperVisitor(_H, _M);
+    p->visit(&HelperVisitor, false);
+}
+
+void
+Slice::Gen::closeOutput()
+{
+    _H.close();
+    _M.close();
+}
+
+void
+Slice::Gen::printHeader(Output& o)
+{
+    static const char* header =
+"// **********************************************************************\n"
+"//\n"
+"// Copyright (c) 2003-2014 ZeroC, Inc. All rights reserved.\n"
+"//\n"
+"// This copy of Ice is licensed to you under the terms described in the\n"
+"// ICE_LICENSE file included in this distribution.\n"
+"//\n"
+"// **********************************************************************\n"
+        ;
+
+    o << header;
+    o << "\n// Ice version " << ICE_STRING_VERSION;
+}
+
+Slice::Gen::UnitVisitor::UnitVisitor(Output& H, Output& M) :
+    ObjCVisitor(H, M)
+{
+}
+
+bool
+Slice::Gen::UnitVisitor::visitModuleStart(const ModulePtr& p)
+{
+    string dummy;
+    if(p->findMetaData("objc:prefix", dummy))
+    {
+        _prefixes.push_back(modulePrefix(p));
+    }
+    return true;
+}
+
+void
+Slice::Gen::UnitVisitor::visitUnitEnd(const UnitPtr& unit)
+{
+    string uuid = IceUtil::generateUUID();
+    for(string::size_type pos = 0; pos < uuid.size(); ++pos)
+    {
+        if(!isalnum(uuid[pos]))
+        {
+            uuid[pos] = '_';
+        }
+    }
+
+    if(!_prefixes.empty())
+    {
+        _M << sp << nl << "@implementation ICEInternalPrefixTable(C" << uuid << ")";
+        _M << nl << "-(void)addPrefixes_C" << uuid << ":(NSMutableDictionary*)prefixTable";
+        _M << sb;
+        for(vector<Slice::ObjCGenerator::ModulePrefix>::const_iterator p = _prefixes.begin(); p != _prefixes.end(); ++p)
+        {
+            _M << nl << "[prefixTable setObject:@\"" << p->name << "\" forKey:@\"" << p->m->scoped() << "\"];";
+        }
+        _M << eb;
+        _M << nl << "@end";
+    }
+}
+
+Slice::Gen::ObjectDeclVisitor::ObjectDeclVisitor(Output& H, Output& M)
+    : ObjCVisitor(H, M)
+{
+}
+
+void
+Slice::Gen::ObjectDeclVisitor::visitClassDecl(const ClassDeclPtr& p)
+{
+    _H << sp << nl << "@class " << fixName(p) << ";";
+    _H << nl << "@protocol " << fixName(p) << ";";
+}
+
+Slice::Gen::ProxyDeclVisitor::ProxyDeclVisitor(Output& H, Output& M)
+    : ObjCVisitor(H, M)
+{
+}
+
+void
+Slice::Gen::ProxyDeclVisitor::visitClassDecl(const ClassDeclPtr& p)
+{
+    _H << sp << nl << "@class " << fixName(p) << "Prx;";
+    _H << nl << "@protocol " << fixName(p) << "Prx;";
+}
+
+Slice::Gen::TypesVisitor::TypesVisitor(Output& H, Output& M)
+    : ObjCVisitor(H, M)
+{
+}
+
+bool
+Slice::Gen::TypesVisitor::visitModuleStart(const ModulePtr& p)
+{
+    string suffix;
+    StringList names = splitScopedName(p->scoped());
+    for(StringList::const_iterator i = names.begin(); i != names.end(); ++i)
+    {
+        if(i != names.begin())
+        {
+            suffix += "_";
+        }
+        suffix += *i;
+    }
+    string symbol = "ICE_MODULE_PREFIX_";
+    symbol += suffix;
+    return true;
+}
+
+void
+Slice::Gen::TypesVisitor::visitModuleEnd(const ModulePtr&)
+{
+}
+
+bool
+Slice::Gen::TypesVisitor::visitClassDefStart(const ClassDefPtr& p)
+{
+    string name = fixName(p);
+    ClassList bases = p->bases();
+
+    _H << sp << nl << "@protocol " << name;
+    if(!bases.empty())
+    {
+        _H << " <";
+        for(ClassList::const_iterator i = bases.begin(); i != bases.end(); ++i)
+        {
+            string baseName = fixName(*i);
+            if(i != bases.begin())
+            {
+                _H << ", ";
+            }
+            _H << baseName;
+        }
+        _H << ">";
+    }
+
+    _M << sp << nl << "@implementation " << name;
+
+    return true;
+}
+
+void
+Slice::Gen::TypesVisitor::visitClassDefEnd(const ClassDefPtr& p)
+{
+    string name = fixName(p);
+    ClassList bases = p->bases();
+    bool basePreserved = p->inheritsMetaData("preserve-slice");
+    bool preserved = p->hasMetaData("preserve-slice");
+    bool hasBaseClass = !bases.empty() && !bases.front()->isInterface();
+    string baseName = hasBaseClass ? fixName(bases.front()) : "ICEObject";
+    DataMemberList baseDataMembers;
+    if(hasBaseClass)
+    {
+        baseDataMembers = bases.front()->allDataMembers();
+    }
+    DataMemberList dataMembers = p->dataMembers();
+    DataMemberList optionalMembers = p->orderedOptionalDataMembers();
+    DataMemberList allDataMembers = p->allDataMembers();
+
+    _H << nl << "@end";
+
+    _H << sp << nl << "@interface " << name << " : " << baseName;
+
+    if(!dataMembers.empty() || (preserved && !basePreserved))
+    {
+        //
+        // Data member declarations.
+        //
+        _H << sb;
+
+        if(!dataMembers.empty())
+        {
+            writeMembers(dataMembers, BaseTypeObject);
+        }
+
+        if(preserved && !basePreserved)
+        {
+            _H << nl << "id<ICESlicedData> slicedData__;";
+        }
+
+        _H << eb;
+        _H << sp;
+
+        _M << sp;
+    }
+
+    //
+    // @property and @synthesize for each data member.
+    //
+    writeProperties(dataMembers, BaseTypeObject);
+    writeSynthesize(dataMembers, BaseTypeObject);
+
+    //
+    // Constructor.
+    //
+    if(!dataMembers.empty())
+    {
+        _H << sp;
+    }
+    if(!p->isInterface() && !dataMembers.empty())
+    {
+        if(p->hasDefaultValues())
+        {
+            _H << nl << "-(id) init;";
+            _M << sp << nl << "-(id) init";
+            _M << sb;
+            _M << nl << "self = [super init];";            
+            _M << nl << "if(!self)";
+            _M << sb;
+            _M << nl << "return nil;";
+            _M << eb;
+            writeMemberDefaultValueInit(dataMembers, BaseTypeObject);
+            _M << nl << "return self;";
+            _M << eb;
+        }
+        _H << nl << "-(id) init";
+        _M << sp << nl << "-(id) init";
+        writeMemberSignature(allDataMembers, BaseTypeObject, Other);
+        _H << ";";
+        _M << sb;
+        _M << nl << "self = [super init";
+        writeMemberCall(baseDataMembers, BaseTypeObject, Other, WithEscape);
+        _M << "];";
+        _M << nl << "if(!self)";
+        _M << sb;
+        _M << nl << "return nil;";
+        _M << eb;
+        writeMemberInit(dataMembers, BaseTypeObject);
+        _M << nl << "return self;";
+        _M << eb;
+    }
+
+    //
+    // Convenience constructors.
+    //
+    if(!allDataMembers.empty())
+    {
+        string lowerCaseName = fixId(p->name());
+        *(lowerCaseName.begin()) = tolower(*lowerCaseName.begin());
+
+        _H << nl << "+(id) " << lowerCaseName;
+        _M << sp << nl << "+(id) " << lowerCaseName;
+        writeMemberSignature(allDataMembers, BaseTypeObject, Other);
+        _H << ";";
+        _M << sb;
+
+        //
+        // The cast avoids a compiler warning that is emitted if different structs
+        // have members with the same name but different types.
+        //
+        _M << nl << name << " *s__ = [(" << name << " *)[" << name << " alloc] init";
+        writeMemberCall(allDataMembers, BaseTypeObject, Other, WithEscape);
+        _M << "];";
+
+        _M.zeroIndent();
+        _M << nl << "#if defined(__clang__) && !__has_feature(objc_arc)";
+        _M.restoreIndent();
+        _M << nl << "[s__ autorelease];";
+        _M.zeroIndent();
+        _M << nl << "#endif";
+        _M.restoreIndent();
+
+        _M << nl << "return s__;";
+        _M << eb;
+
+        _H << nl << "+(id) " << lowerCaseName << ";";
+        _M << sp << nl << "+(id) " << lowerCaseName;
+        _M << sb;
+        _M << nl << name << " *s__ = [[" << name << " alloc] init];";
+
+        _M.zeroIndent();
+        _M << nl << "#if defined(__clang__) && !__has_feature(objc_arc)";
+        _M.restoreIndent();
+        _M << nl << "[s__ autorelease];";
+        _M.zeroIndent();
+        _M << nl << "#endif";
+        _M.restoreIndent();
+
+        _M << nl << "return s__;";
+        _M << eb;
+    }
+
+    if(!p->isInterface())
+    {
+        //
+        //  copyWithZone and dealloc
+        //
+        if(!dataMembers.empty())
+        {
+            _M << sp << nl << "-(id) copyWithZone:(NSZone *)zone_p";
+            _M << sb;
+            _M << nl << "return [(" << name << " *)[[self class] allocWithZone:zone_p] init";
+            writeMemberCall(allDataMembers, BaseTypeObject, Other, NoEscape);
+            _M << "];";
+            _M << eb;
+            _H << nl << "// This class also overrides copyWithZone:.";
+
+            writeMemberDealloc(dataMembers, BaseTypeObject, preserved && !basePreserved);
+        }
+    }
+
+    //
+    // Setter, has, clear selectors for optionals
+    //
+    writeOptionalDataMemberSelectors(dataMembers, BaseTypeObject);
+
+    //
+    // If the class uses a compact id we generate a +load method to register the compact id
+    // with the compact id resolver.
+    //
+    if(p->compactId() >= 0)
+    {
+        _M << sp << nl << "+(void) load";
+        _M << sb;
+        _M << nl << "[CompactIdMapHelper registerClass:@\"" << p->scoped() << "\" value:" << p->compactId() << "];";
+        _M << eb;
+    }
+
+    //
+    // Operations
+    //
+    OperationList ops = p->operations();
+    OperationList::const_iterator r;
+    for(r = ops.begin(); r != ops.end(); ++r)
+    {
+        OperationPtr op = *r;
+        _H << nl << "+(BOOL)" << op->name() << "___:(id<" << name
+           << ">)target current:(ICECurrent *)current " 
+           << "is:(id<ICEInputStream>)is_ os:(id<ICEOutputStream>)os_;";
+    }
+
+    _M << sp << nl << "+(id)objectWithDelegate:(id)delegate";
+    _M << sb;
+    _M.zeroIndent();
+    _M << sp << nl << "#if defined(__clang__) && __has_feature(objc_arc)";
+    _M.restoreIndent();
+    _M << nl << "return [[" << name << " alloc] initWithDelegate:delegate];";
+    _M.zeroIndent();
+    _M << nl << "#else";
+    _M.restoreIndent();
+    _M << nl << "return [[[" << name << " alloc] initWithDelegate:delegate] autorelease];";
+    _M.zeroIndent();
+    _M << nl << "#endif";
+    _M.restoreIndent();
+    _M << eb;
+
+    //
+    // Marshaling/unmarshaling
+    //
+
+    _M << sp << nl << "-(void) writeImpl__:(id<ICEOutputStream>)os_";
+    _M << sb;
+    _M << nl << "[os_ startSlice:@\"" << p->scoped() << "\" compactId: " << p->compactId() << " lastSlice:" 
+                                                                     << (!hasBaseClass ? "YES" : "NO") << "];";
+    writeMemberMarshal(dataMembers, optionalMembers, BaseTypeObject);
+    _M << nl << "[os_ endSlice];";
+    if(hasBaseClass)
+    {
+        _M << nl << "[super writeImpl__:os_];";
+    }
+    _M << eb;
+
+    _H << nl << "@end";
+
+    _M << sp << nl << "-(void) readImpl__:(id<ICEInputStream>)is_";
+    _M << sb;
+    _M << nl << "[is_ startSlice];";
+    writeMemberUnmarshal(dataMembers, optionalMembers, BaseTypeObject);
+    _M << nl << "[is_ endSlice];";
+    if(hasBaseClass)
+    {
+        _M << nl << "[super readImpl__:is_];";
+    }
+    _M << eb;
+
+    writeDispatchAndMarshalling(p);
+
+    if(preserved && !basePreserved)
+    {        
+        _M << nl << "-(void) write__:(id<ICEOutputStream>)os";
+        _M << sb;
+        _M << nl << "[os startObject:slicedData__];";
+        _M << nl << "[self writeImpl__:os];";
+        _M << nl << "[os endObject];";
+        _M << eb;
+
+        _M << nl << "-(void) read__:(id<ICEInputStream>)is";
+        _M << sb;
+        _M << nl << "[is startObject];";
+        _M << nl << "[self readImpl__:is];";
+        _M << nl << "slicedData__ = [is endObject:YES];";
+        _M << eb;
+    }
+
+    _M << nl << "@end";
+}
+
+void
+Slice::Gen::TypesVisitor::visitOperation(const OperationPtr& p)
+{
+    string name = getName(p);
+    TypePtr returnType = p->returnType();
+    string retString = typeToString(returnType);
+    string params = getServerParams(p);
+
+    
+    _H << nl << "-(" << inTypeToString(returnType, p->returnIsOptional()) << ") " << name << params;
+    if(!params.empty())
+    {
+        _H << " current";
+    }
+    _H << ":(ICECurrent *)current;";
+}
+
+void
+Slice::Gen::TypesVisitor::visitSequence(const SequencePtr& p)
+{
+    string prefix = moduleName(findModule(p));
+    string name = fixName(p);
+
+    if(isValueType(p->type()))
+    {
+        _H << sp << nl << "typedef NSData " << name << ";";
+        _H << nl << "typedef NSMutableData " << prefix << "Mutable" << p->name() << ";";
+    }
+    else
+    {
+        _H << sp << nl << "typedef NSArray " << name << ";";
+        _H << nl << "typedef NSMutableArray " << prefix << "Mutable" << p->name() << ";";
+    }
+}
+
+bool
+Slice::Gen::TypesVisitor::visitExceptionStart(const ExceptionPtr& p)
+{
+    string name = fixName(p);
+    ExceptionPtr base = p->base();
+    DataMemberList dataMembers = p->dataMembers();
+    bool basePreserved = p->inheritsMetaData("preserve-slice");
+    bool preserved = p->hasMetaData("preserve-slice");
+
+    _H << sp;
+
+    _H << nl << "@interface " << name << " : ";
+    if(base)
+    {
+        _H << fixName(base);
+    }
+    else
+    {
+        _H << (p->isLocal() ? "ICELocalException" : "ICEUserException");
+    }
+    if(!dataMembers.empty() || (preserved && !basePreserved))
+    {
+        _H << sb;
+    }
+
+    _M << sp << nl << "@implementation " << name;
+
+    return true;
+}
+
+void
+Slice::Gen::TypesVisitor::visitExceptionEnd(const ExceptionPtr& p)
+{
+    string name = fixName(p);
+
+    string lowerCaseName = fixId(p->name());
+    *(lowerCaseName.begin()) = tolower(*lowerCaseName.begin());
+    bool basePreserved = p->inheritsMetaData("preserve-slice");
+    bool preserved = p->hasMetaData("preserve-slice");
+    DataMemberList dataMembers = p->dataMembers();
+    DataMemberList optionalMembers = p->orderedOptionalDataMembers();
+    DataMemberList allDataMembers = p->allDataMembers();
+    DataMemberList::const_iterator q;
+    
+    DataMemberList baseDataMembers;
+    if(p->base())
+    {
+        baseDataMembers = p->base()->allDataMembers();
+    }
+
+    if(!dataMembers.empty() || (preserved && !basePreserved))
+    {
+        //
+        // Data member declarations.
+        //
+        if(!dataMembers.empty())
+        {
+            writeMembers(dataMembers, BaseTypeException);
+        }
+
+        if(preserved && !basePreserved)
+        {
+            _H << nl << "id<ICESlicedData> slicedData__;";
+        }
+
+        _H << eb;
+        _H << sp;
+        _M << sp;
+
+        //
+        // @property and @synthesize for each data member.
+        //
+        if(!dataMembers.empty())
+        {
+            writeProperties(dataMembers, BaseTypeException);
+            writeSynthesize(dataMembers, BaseTypeException);
+        }
+        _H << sp;
+    }
+
+    //
+    // ice_name
+    //
+    _H << nl << "-(NSString *) ice_name;";
+    _M << sp << nl << "-(NSString *) ice_name";
+    _M << sb;
+    _M << nl << "return @\"" << p->scoped().substr(2) << "\";";
+    _M << eb;
+
+    //
+    // Constructors.
+    //
+    if(p->isLocal() && !dataMembers.empty())
+    {
+        _H << nl << "-(id) init:(const char*)file__p line:(int)line__p;";
+        _M << sp << nl << "-(id) init:(const char*)file__p line:(int)line__p";
+        _M << sb;
+        _M << nl << "self = [super init:file__p line:line__p];";
+        _M << nl << "if(!self)";
+        _M << sb;
+        _M << nl << "return nil;";
+        _M << eb;
+        _M << nl << "return self;";
+        _M << eb;
+    }
+    if(!dataMembers.empty())
+    {
+        if(!p->base() || p->hasDefaultValues())
+        {
+            _H << sp << nl << "-(id) init;";
+            _M << sp << nl << "-(id) init";
+            _M << sb;
+            _M << nl << "self = ";
+            if(!p->base())
+            {
+                _M << "[super initWithName:[self ice_name] reason:nil userInfo:nil];";
+            }
+            else
+            {
+                _M << nl << "[super init];";
+            }
+            _M << nl << "if(!self)";
+            _M << sb;
+            _M << nl << "return nil;";
+            _M << eb;
+            if(p->hasDefaultValues())
+            {
+                writeMemberDefaultValueInit(dataMembers, BaseTypeObject);
+            }
+            _M << nl << "return self;";
+            _M << eb;
+        }
+
+        _H << nl << "-(id) init";
+        _M << sp << nl << "-(id) init";
+        writeMemberSignature(allDataMembers, BaseTypeException, p->isLocal() ? LocalException : Other);
+        _H << ";";
+        _M << sb;
+        _M << nl << "self = ";
+        if(!p->base())
+        {
+            _M << nl << "[super initWithName:[self ice_name] reason:nil userInfo:nil];";
+        }
+        else
+        {
+            _M << nl << "[super init";
+            if(p->isLocal())
+            {
+                _M << ":file__p line:line__p ";
+            }
+            writeMemberCall(baseDataMembers, BaseTypeException, p->isLocal() ? LocalException : Other, WithEscape);
+            _M << "];";
+        }
+        _M << nl << "if(!self)";
+        _M << sb;
+        _M << nl << "return nil;";
+        _M << eb;
+        if(!dataMembers.empty())
+        {
+            writeMemberInit(dataMembers, BaseTypeException);
+        }
+        _M << nl << "return self;";
+        _M << eb;
+    }
+
+    //
+    // Convenience constructors.
+    //
+    _H << nl << "+(id) " << lowerCaseName;
+    _M << sp << nl << "+(id) " << lowerCaseName;
+    writeMemberSignature(allDataMembers, BaseTypeException, p->isLocal() ? LocalException : Other);
+    _H << ";";
+
+    //
+    // The cast avoids a compiler warning that is emitted if different exceptions
+    // have members with the same name but different types.
+    //
+    _M << sb;
+    _M << nl << name << " *s__ = [(" << name << " *)[" << name << " alloc] init";
+    if(p->isLocal())
+    {
+        _M << ":file__p line:line__p";
+    }
+    writeMemberCall(allDataMembers, BaseTypeException, p->isLocal() ? LocalException : Other, WithEscape);
+    _M << "];";
+    _M.zeroIndent();
+    _M << nl << "#if defined(__clang__) && !__has_feature(objc_arc)";
+    _M.restoreIndent();
+    _M << nl << "[s__ autorelease];";
+    _M.zeroIndent();
+    _M << nl << "#endif";
+    _M.restoreIndent();
+    _M << nl << "return s__;";
+    _M << eb;
+
+    if(!allDataMembers.empty())
+    {
+        _H << nl << "+(id) " << lowerCaseName;
+        _M << sp << nl << "+(id) " << lowerCaseName;
+        if(p->isLocal())
+        {
+            _H << ":(const char*)file__p line:(int)line__p";
+            _M << ":(const char*)file__p line:(int)line__p";
+        }
+        _H << ";";
+        _M << sb;
+        _M << nl << name << " *s__ = [[" << name << " alloc] init";
+        if(p->isLocal())
+        {
+            _M << ":file__p line:line__p";
+        }
+        _M << "];";
+        _M.zeroIndent();
+        _M << nl << "#if defined(__clang__) && !__has_feature(objc_arc)";
+        _M.restoreIndent();
+        _M << nl << "[s__ autorelease];";
+        _M.zeroIndent();
+        _M << nl << "#endif";
+        _M.restoreIndent();
+        _M << nl << "return s__;";
+        _M << eb;
+    }
+
+    //
+    // copyWithZone and dealloc
+    //
+    if(!dataMembers.empty())
+    {
+        _M << sp << nl << "-(id) copyWithZone:(NSZone *)zone_p";
+        _M << sb;
+        _M << nl << "return [(" << name << " *)[[self class] allocWithZone:zone_p] init";
+        if(p->isLocal())
+        {
+            _M << ":file line:line";
+        }
+        writeMemberCall(allDataMembers, BaseTypeException, p->isLocal() ? LocalException : Other, NoEscape);
+        _M << "];";
+        _M << eb;
+        _H << nl << "// This class also overrides copyWithZone:.";
+
+        writeMemberDealloc(dataMembers, BaseTypeException, preserved && !basePreserved);
+    }
+
+    //
+    // Setter, has, clear selectors for optionals
+    //
+    writeOptionalDataMemberSelectors(dataMembers, BaseTypeObject);
+
+    //
+    // Marshaling/unmarshaling
+    //
+    ExceptionPtr base = p->base();
+    if(!p->allClassDataMembers().empty())
+    {
+        if(!base || (base && !base->usesClasses(false)))
+        {
+            _M << sp << nl << "-(BOOL) usesClasses__";
+            _M << sb;
+            _M << nl << "return YES;";
+            _M << eb;
+        }
+    }
+
+    if(!p->isLocal())
+    {
+        _M << sp << nl << "-(void) writeImpl__:(id<ICEOutputStream>)os_";
+        _M << sb;
+        _M << nl << "[os_ startSlice:@\"" << p->scoped() << "\" compactId:-1 lastSlice:" 
+           << (!base ? "YES" : "NO") << "];";
+        writeMemberMarshal(dataMembers, optionalMembers, BaseTypeException);
+        _M << nl << "[os_ endSlice];";
+        if(base)
+        {
+            _M << nl << "[super writeImpl__:os_];";
+        }
+        _M << eb;
+
+        _M << sp << nl << "-(void) readImpl__:(id<ICEInputStream>)is_";
+        _M << sb;
+        _M << nl << "[is_ startSlice];";
+        writeMemberUnmarshal(dataMembers, optionalMembers, BaseTypeException);
+        _M << nl << "[is_ endSlice];";
+        if(base)
+        {
+            _M << nl << "[super readImpl__:is_];";
+        }
+        _M << eb;
+
+        if(preserved && !basePreserved)
+        {
+            _M << nl << nl << "-(void) write__:(id<ICEOutputStream>)os";
+            _M << sb;
+            _M << nl << "[os startException:slicedData__];";
+            _M << nl << "[self writeImpl__:os];";
+            _M << nl << "[os endException];";
+            _M << eb;
+
+            _M << nl << nl << "-(void) read__:(id<ICEInputStream>)is";
+            _M << sb;
+            _M << nl << "[is startException];";
+            _M << nl << "[self readImpl__:is];";
+            _M << nl << "slicedData__ = [is endException:YES];";
+            _M << eb;
+        }
+    }
+
+    _H << nl << "@end";
+    _M << nl << "@end";
+}
+
+bool
+Slice::Gen::TypesVisitor::visitStructStart(const StructPtr& p)
+{
+    string name = fixName(p);
+
+    _H << sp;
+
+    _H << nl << "@interface " << name << " : NSObject <NSCopying>";
+    _H << sb;
+    _H << nl << "@private";
+    _H.inc();
+
+    _M << sp << nl << "@implementation " << name << sp;
+
+    return true;
+}
+
+void
+Slice::Gen::TypesVisitor::visitStructEnd(const StructPtr& p)
+{
+    string name = fixName(p);
+    DataMemberList dataMembers = p->dataMembers();
+    DataMemberList::const_iterator q;
+
+    //
+    // Data member declarations.
+    //
+    writeMembers(dataMembers, BaseTypeObject);
+
+    _H.dec();
+    _H << eb;
+
+    _H << sp;
+
+    //
+    // @property and @synthesize for each data member.
+    //
+    writeProperties(dataMembers, BaseTypeObject);
+    writeSynthesize(dataMembers, BaseTypeObject);
+
+    //
+    // Constructor.
+    //
+    if(p->hasDefaultValues())
+    {
+        _H << sp << nl << "-(id) init;";
+        _M << sp << nl << "-(id) init";
+        _M << sb;
+        _M << nl << "self = [super init];";
+        _M << nl << "if(!self)";
+        _M << sb;
+        _M << nl << "return nil;";
+        _M << eb;
+        writeMemberDefaultValueInit(dataMembers, BaseTypeObject);
+        _M << nl << "return self;";
+        _M << eb;
+    }
+    _H << sp << nl << "-(id) init";
+    _M << sp << nl << "-(id) init";
+    writeMemberSignature(dataMembers, BaseTypeObject, Other);
+    _H << ";";
+    _M << sb;
+    _M << nl << "self = [super init];";
+    _M << nl << "if(!self)";
+    _M << sb;
+    _M << nl << "return nil;";
+    _M << eb;
+    writeMemberInit(dataMembers, BaseTypeObject);
+    _M << nl << "return self;";
+    _M << eb;
+
+    //
+    // Convenience constructor.
+    //
+    string lowerCaseName = fixId(p->name());
+    *(lowerCaseName.begin()) = tolower(*lowerCaseName.begin());
+
+    _H << nl << "+(id) " << lowerCaseName;
+    _M << sp << nl << "+(id) " << lowerCaseName;
+    writeMemberSignature(dataMembers, BaseTypeObject, Other);
+    _H << ";";
+    _M << sb;
+
+    //
+    // The cast avoids a compiler warning that is emitted if different structs
+    // have members with the same name but different types.
+    //
+    _M << nl << name << " *s__ = [(" << name << "* )[" << name << " alloc] init";
+    writeMemberCall(dataMembers, BaseTypeObject, Other, WithEscape);
+    _M << "];";
+    _M.zeroIndent();
+    _M << nl << "#if defined(__clang__) && !__has_feature(objc_arc)";
+    _M.restoreIndent();
+    _M << nl << "[s__ autorelease];";
+    _M.zeroIndent();
+    _M << nl << "#endif";
+    _M.restoreIndent();
+    _M << nl << "return s__;";
+    _M << eb;
+
+    _H << nl << "+(id) " << lowerCaseName << ";";
+    _M << sp << nl << "+(id) " << lowerCaseName;
+    _M << sb;
+    _M << nl << name << " *s__ = [[" << name << " alloc] init];";
+    _M.zeroIndent();
+    _M << nl << "#if defined(__clang__) && !__has_feature(objc_arc)";
+    _M.restoreIndent();
+    _M << nl << "[s__ autorelease];";
+    _M.zeroIndent();
+    _M << nl << "#endif";
+    _M.restoreIndent();
+    _M << nl << "return s__;";
+    _M << eb;
+
+    //
+    // copyWithZone
+    //
+    _M << sp << nl << "-(id) copyWithZone:(NSZone *)zone_p";
+    _M << sb;
+    _M << nl << "return [(" << name << " *)[[self class] allocWithZone:zone_p] init";
+    writeMemberCall(dataMembers, BaseTypeObject, Other, NoEscape);
+    _M << "];";
+    _M << eb;
+
+    //
+    // hash
+    //
+    writeMemberHashCode(dataMembers, BaseTypeObject);
+
+    //
+    // isEqual
+    //
+    _M << sp << nl << "-(BOOL) isEqual:(id)o_";
+    _M << sb;
+    _M << nl << "if(self == o_)";
+    _M << sb;
+    _M << nl << "return YES;";
+    _M << eb;
+    _M << nl << "if(!o_ || ![o_ isKindOfClass:[self class]])";
+    _M << sb;
+    _M << nl << "return NO;";
+    _M << eb;
+    writeMemberEquals(dataMembers, BaseTypeObject);
+    _M << eb;
+
+    _H << nl << "// This class also overrides copyWithZone:, hash, and isEqual:";
+
+    //
+    // dealloc
+    //
+    writeMemberDealloc(dataMembers, BaseTypeObject);
+
+    //
+    // Marshaling/unmarshaling
+    //
+    _H << nl << "-(void) write__:(id<ICEOutputStream>)os_;";
+    _H << nl << "-(void) read__:(id<ICEInputStream>)is_;";
+
+    _M << sp << nl << "-(void) write__:(id<ICEOutputStream>)os_";
+    _M << sb;
+    writeMemberMarshal(dataMembers, DataMemberList(), BaseTypeObject);
+    _M << eb;
+
+    _M << sp << nl << "-(void) read__:(id<ICEInputStream>)is_";
+    _M << sb;
+    writeMemberUnmarshal(dataMembers, DataMemberList(), BaseTypeObject);
+    _M << eb;
+
+    _H << nl << "@end";
+    _M << nl << "@end";
+}
+
+void
+Slice::Gen::TypesVisitor::visitDictionary(const DictionaryPtr& p)
+{
+    string prefix = moduleName(findModule(p));
+    string name = fixName(p);
+
+    _H << sp << nl << "typedef NSDictionary " << name << ";";
+    _H << nl << "typedef NSMutableDictionary " << prefix << "Mutable" << p->name() << ";";
+}
+
+void
+Slice::Gen::TypesVisitor::visitEnum(const EnumPtr& p)
+{
+    string name = fixName(p);
+    EnumeratorList enumerators = p->getEnumerators();
+    _H << sp;
+
+    //
+    // Check if any of the enumerators were assigned an explicit value.
+    //
+    const bool explicitValue = p->explicitValue();
+
+    _H << nl << "typedef enum : ICEInt";
+    _H << sb;
+    EnumeratorList::const_iterator en = enumerators.begin();
+    while(en != enumerators.end())
+    {
+        _H << nl << fixName(*en);
+        //
+        // If any of the enumerators were assigned an explicit value, we emit
+        // an explicit value for *all* enumerators.
+        //
+        if(explicitValue)
+        {
+            _H << " = " << int64ToString((*en)->value());
+        }
+        if(++en != enumerators.end())
+        {
+            _H << ',';
+        }
+    }
+    _H << eb << " " << name << ";";
+}
+
+void
+Slice::Gen::TypesVisitor::visitConst(const ConstPtr& p)
+{
+    _H << sp;
+    if(isString(p->type()))
+    {
+        _H << nl << "static NSString * const";
+    }
+    else
+    {
+        _H << nl << "static const " << typeToString(p->type());
+    }
+    _H << " " << fixName(p) << " = ";
+    writeConstantValue(_H, p->type(), p->value());
+    _H << ';';
+}
+
+void
+Slice::Gen::TypesVisitor::writeConstantValue(IceUtilInternal::Output& out, const TypePtr& type, const string& val) const
+{
+    if(isString(type))
+    {
+        //
+        // Expand strings into the basic source character set. We can't use isalpha() and the like
+        // here because they are sensitive to the current locale.
+        //
+        static const string basicSourceChars = "abcdefghijklmnopqrstuvwxyz"
+                                               "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+                                               "0123456789"
+                                               "_{}[]#()<>%:;.?*+-/^&|~!=,\\\"' ";
+        static const set<char> charSet(basicSourceChars.begin(), basicSourceChars.end());
+
+        out << "@\"";                                      // Opening @"
+
+        for(string::const_iterator c = val.begin(); c != val.end(); ++c)
+        {
+            if(charSet.find(*c) == charSet.end())
+            {
+                unsigned char uc = *c;                  // char may be signed, so make it positive
+                ostringstream s;
+                s << "\\";                              // Print as octal if not in basic source character set
+                s.width(3);
+                s.fill('0');
+                s << oct;
+                s << static_cast<unsigned>(uc);
+                out << s.str();
+            }
+            else
+            {
+                out << *c;                                // Print normally if in basic source character set
+            }
+        }
+
+        out << "\"";                                      // Closing "
+    }
+    else
+    {
+        EnumPtr ep = EnumPtr::dynamicCast(type);
+        if(ep)
+        {
+            out  << moduleName(findModule(ep)) << val;
+        }
+        else
+        {
+            if(val == "true")
+            {
+                out << "YES";
+            }
+            else if(val == "false")
+            {
+                out << "NO";
+            }
+            else
+            {
+                out << val;
+            }
+        }
+    }
+}
+
+void
+Slice::Gen::TypesVisitor::writeMembers(const DataMemberList& dataMembers, int baseType) const
+{
+    for(DataMemberList::const_iterator q = dataMembers.begin(); q != dataMembers.end(); ++q)
+    {
+        TypePtr type = (*q)->type();
+        string name = fixId((*q)->name(), baseType);
+
+        _H << nl << typeToString(type) << " ";
+        if(mapsToPointerType(type))
+        {
+            _H << "*";
+        }
+        _H << name << ";";
+
+        if((*q)->optional())
+        {
+            _H << nl << "BOOL has_" << name << "__;";
+        }
+    }
+}
+
+void
+Slice::Gen::TypesVisitor::writeMemberSignature(const DataMemberList& dataMembers, int baseType,
+                                               ContainerType ct) const
+{
+    if(ct == LocalException)
+    {
+        _H << ":(const char*)file__p line:(int)line__p";
+        _M << ":(const char*)file__p line:(int)line__p";
+    }
+    for(DataMemberList::const_iterator q = dataMembers.begin(); q != dataMembers.end(); ++q)
+    {
+        TypePtr type = (*q)->type();
+        string typeString = inTypeToString(type, (*q)->optional());
+        string name = fixId((*q)->name(), baseType);
+
+        if(q != dataMembers.begin() || ct == LocalException)
+        {
+            _H << " " << name;
+            _M << " " << name;
+        }
+        _H << ":(" << typeString << ")" << fixId((*q)->name());
+        _M << ":(" << typeString << ")" << fixId((*q)->name()) << "_p";
+    }
+}
+
+void
+Slice::Gen::TypesVisitor::writeMemberCall(const DataMemberList& dataMembers, int baseType,
+                                          ContainerType ct, Escape esc) const
+{
+    for(DataMemberList::const_iterator q = dataMembers.begin(); q != dataMembers.end(); ++q)
+    {
+        string name = (*q)->name();
+
+        if(q != dataMembers.begin() || ct == LocalException)
+        {
+            _M << " " << fixId(name, baseType);
+        }
+
+        name = esc == NoEscape ? fixId(name, baseType) : fixId(name);
+        if(esc == NoEscape)
+        {
+            if((*q)->optional())
+            {
+                if(isValueType((*q)->type()))
+                {
+                    _M << ":" << "(self->has_" << name << "__ ? @(self->" << name << ") : ICENone)";
+                }
+                else
+                {
+                    _M << ":" << "(self->has_" << name << "__ ? self->" << name << " : ICENone)";
+                }
+            }
+            else
+            {
+                _M << ":" << name;
+            }
+        }
+        else
+        {
+            _M << ":" << name << "_p";
+        }
+    }
+}
+
+void
+Slice::Gen::TypesVisitor::writeMemberDefaultValueInit(const DataMemberList& dataMembers, int baseType) const
+{
+    for(DataMemberList::const_iterator p = dataMembers.begin(); p != dataMembers.end(); ++p)
+    {
+        if((*p)->defaultValueType())
+        {
+            string name = fixId((*p)->name(), baseType);
+            if((*p)->optional())
+            {
+                _M << nl << "self->has_" << name << "__ = YES;";
+            }
+            _M << nl << "self->" << name << " = ";
+            writeConstantValue(_M, (*p)->type(), (*p)->defaultValue());
+            _M << ";";
+        }
+    }
+}
+
+void
+Slice::Gen::TypesVisitor::writeMemberInit(const DataMemberList& dataMembers, int baseType) const
+{
+    for(DataMemberList::const_iterator q = dataMembers.begin(); q != dataMembers.end(); ++q)
+    {
+        TypePtr type = (*q)->type();
+        string name = fixId((*q)->name());
+        if((*q)->optional())
+        {
+            if(isValueType(type))
+            {
+                _M << nl << "self->has_" << name << "__ = [ICEOptionalGetter " << getOptionalHelperGetter(type) << ":";
+                _M << name << "_p value:&self->" << fixId((*q)->name(), baseType) << "];";
+            }
+            else
+            {
+                _M << nl << "self->has_" << name << "__ = [ICEOptionalGetter getRetained:";
+                _M << name << "_p value:&self->" << fixId((*q)->name(), baseType);
+                _M << " type:[" << typeToObjCTypeString(type) << " class]];";
+            }
+        }
+        else
+        {
+            if(isValueType(type))
+            {
+                _M << nl << "self->" << fixId((*q)->name(), baseType) << " = " << name << "_p;";
+            }
+            else
+            {
+                _M.zeroIndent();
+                _M << nl << "#if defined(__clang__) && __has_feature(objc_arc)";
+                _M.restoreIndent();
+                _M << nl << "self->" << fixId((*q)->name(), baseType) << " = " << name << "_p;";
+                _M.zeroIndent();
+                _M << nl << "#else";
+                _M.restoreIndent();
+                _M << nl << "self->" << fixId((*q)->name(), baseType) << " = [" << name << "_p retain];";
+                _M.zeroIndent();
+                _M << nl << "#endif";
+                _M.restoreIndent();
+            }
+        }
+    }
+}
+
+void
+Slice::Gen::TypesVisitor::writeProperties(const DataMemberList& dataMembers, int baseType) const
+{
+    for(DataMemberList::const_iterator q = dataMembers.begin(); q != dataMembers.end(); ++q)
+    {
+        TypePtr type = (*q)->type();
+        string name = fixId((*q)->name(), baseType);
+
+        string typeString = typeToString(type);
+        bool isValue = isValueType(type);
+
+        _H << nl << "@property(nonatomic, ";
+        if(isValue)
+        {
+            _H << "assign";
+        }
+        else
+        {
+            _H << "ICE_STRONG_ATTR";
+        }
+        _H << ") " << typeString << " ";
+        if(mapsToPointerType(type))
+        {
+            _H << "*";
+        }
+        _H << name << ";";
+    }
+}
+
+void
+Slice::Gen::TypesVisitor::writeSynthesize(const DataMemberList& dataMembers, int baseType) const
+{
+    for(DataMemberList::const_iterator q = dataMembers.begin(); q != dataMembers.end(); ++q)
+    {
+        string name = fixId((*q)->name(), baseType);
+        _M << nl << "@synthesize " << name << ";";
+    }
+}
+
+void
+Slice::Gen::TypesVisitor::writeOptionalDataMemberSelectors(const DataMemberList& dataMembers, int baseType) const
+{
+    for(DataMemberList::const_iterator q = dataMembers.begin(); q != dataMembers.end(); ++q)
+    {
+        if(!(*q)->optional()) 
+        { 
+            continue;
+        }
+        
+        TypePtr type = (*q)->type();
+        string typeString = inTypeToString(type, false);
+
+        string name = fixId((*q)->name(), baseType);
+
+        string capName = (*q)->name();
+        capName[0] = toupper(static_cast<unsigned char>(capName[0]));
+
+        _H << nl << "-(void)set" << capName << ":(" << typeString << ")" << name << "_p;";
+
+        _M << nl << "-(void)set" << capName << ":(" << typeString << ")" << name << "_p";
+        _M << sb;
+        _M << nl << "self->has_" << name << "__ = YES;";
+        bool isValue = isValueType(type);
+        if(isValue)
+        {
+            _M << nl << "self->" << name << " = " << name << "_p;";
+        }
+        else
+        {
+            _M.zeroIndent();
+            _M << nl << "#if defined(__clang__) && __has_feature(objc_arc)";
+            _M.restoreIndent();
+            _M << nl << "self->" << name << " = " << name << "_p;";
+            _M.zeroIndent();
+            _M << nl << "#else";
+            _M.restoreIndent();
+            _M << nl << "[self->" << name << " release];";
+            _M << nl << "self->" << name << " = [" << name << "_p retain];";
+            _M.zeroIndent();
+            _M << nl << "#endif";
+            _M.restoreIndent();
+        }
+        _M << eb;
+
+        _H << nl << "-(BOOL)has" << capName << ";";
+        _M << nl << "-(BOOL)has" << capName;
+        _M << sb;
+        _M << nl << "return self->has_" << name << "__;";
+        _M << eb;
+
+        _H << nl << "-(void)clear" << capName << ";";
+        _M << nl << "-(void)clear" << capName;
+        _M << sb;
+        _M << nl << "self->has_" << name << "__ = NO;";
+        if(!isValue)
+        {
+            _M.zeroIndent();
+            _M << nl << "#if defined(__clang__) && __has_feature(objc_arc)";
+            _M.restoreIndent();
+            _M << nl << "self->" << name << " = nil;";
+            _M.zeroIndent();
+            _M << nl << "#else";
+            _M.restoreIndent();
+            _M << nl << "[self->" << name << " release];";
+            _M << nl << "self->" << name << " = nil;";
+            _M.zeroIndent();
+            _M << nl << "#endif";
+            _M.restoreIndent();
+        }
+        _M << eb;
+    }
+}
+
+void
+Slice::Gen::TypesVisitor::writeMemberHashCode(const DataMemberList& dataMembers, int baseType) const
+{
+    _M << sp << nl << "-(NSUInteger) hash";
+    _M << sb;
+    _M << nl << "NSUInteger h_ = 5381;";
+    for(DataMemberList::const_iterator q = dataMembers.begin(); q != dataMembers.end(); ++q)
+    {
+        TypePtr type = (*q)->type();
+        string name = fixId((*q)->name(), baseType);
+
+        _M << nl << "h_ = ((h_ << 5) + h_) ^ ";
+        if(isValueType(type))
+        {
+            BuiltinPtr builtin = BuiltinPtr::dynamicCast(type);
+            if(builtin)
+            {
+                if(builtin->kind() == Builtin::KindFloat || builtin->kind() == Builtin::KindDouble)
+                {
+                    _M << "(2654435761u * (uint)" << name << ");";
+                }
+                else
+                {
+                    _M << "(2654435761u * " << name << ");";
+                }
+            }
+            else
+            {
+                _M << name << ";";
+            }
+        }
+        else
+        {
+            _M << "[self->" << name << " hash];";
+        }
+    }
+    _M << nl << "return h_;";
+    _M << eb;
+}
+
+void
+Slice::Gen::TypesVisitor::writeMemberEquals(const DataMemberList& dataMembers, int baseType) const
+{
+    if(!dataMembers.empty())
+    {
+        ContainerPtr container = (*dataMembers.begin())->container();
+        ContainedPtr contained = ContainedPtr::dynamicCast(container);
+        string containerName = fixName(contained);
+        _M << nl << containerName << " *obj_ = (" << containerName << " *)o_;";
+        for(DataMemberList::const_iterator q = dataMembers.begin(); q != dataMembers.end(); ++q)
+        {
+            TypePtr type = (*q)->type();
+            string name = fixId((*q)->name(), baseType);
+
+            if(isValueType(type))
+            {
+                _M << nl << "if(" << name << " != obj_->" << name << ")";
+                _M << sb;
+                _M << nl << "return NO;";
+                _M << eb;
+            }
+            else
+            {
+                _M << nl << "if(!" << name << ")";
+                _M << sb;
+                _M << nl << "if(obj_->" << name << ")";
+                _M << sb;
+                _M << nl << "return NO;";
+                _M << eb;
+                _M << eb;
+                _M << nl << "else";
+                _M << sb;
+                _M << nl << "if(![self." << name << " ";
+                _M << (isString(type) ? "isEqualToString" : "isEqual");
+                _M << ":obj_->" << name << "])";
+                _M << sb;
+                _M << nl << "return NO;";
+                _M << eb;
+                _M << eb;
+            }
+        }
+    }
+    _M << nl << "return YES;";
+}
+
+void
+Slice::Gen::TypesVisitor::writeMemberDealloc(const DataMemberList& dataMembers, int baseType, bool slicedData) const
+{
+    bool once = false;
+    for(DataMemberList::const_iterator q = dataMembers.begin(); q != dataMembers.end(); ++q)
+    {
+        TypePtr type = (*q)->type();
+        if(!isValueType(type))
+        {
+            if(!once)
+            {
+                once = true;
+                _M << sp;
+                _M.zeroIndent();
+                _M << nl << "#if defined(__clang__) && !__has_feature(objc_arc)";
+                _M.restoreIndent();
+                _M << nl << "-(void) dealloc";
+                _M << sb;
+            }
+
+            bool isValue = isValueType(type);
+            if(!isValue)
+            {
+                _M << nl << "[self->" << fixId((*q)->name(), baseType) << " release];";
+            }
+        }
+    }
+    if(once)
+    {
+        if(slicedData)
+        {
+            _M << nl << "[(NSObject*)slicedData__ release];";
+        }
+        _M << nl << "[super dealloc];";
+        _M << eb;
+        _M.zeroIndent();
+        _M << nl << "#endif";
+        _M.restoreIndent();
+        _H << nl << "// This class also overrides dealloc.";
+    }
+}
+
+void
+Slice::Gen::TypesVisitor::writeMemberMarshal(const DataMemberList& dataMembers, const DataMemberList& optionalMembers, 
+                                             int baseType) const
+{
+    for(DataMemberList::const_iterator q = dataMembers.begin(); q != dataMembers.end(); ++q)
+    {
+        if(!(*q)->optional())
+        {
+            writeMarshalUnmarshalCode(_M, (*q)->type(), "self->" + fixId((*q)->name(), baseType), true, false);
+        }
+    }
+    for(DataMemberList::const_iterator q = optionalMembers.begin(); q != optionalMembers.end(); ++q)
+    {
+        string name = fixId((*q)->name(), baseType);
+        string frmt = getOptionalFormat((*q)->type());
+        _M << nl << "if(self->has_" << name << "__ && [os_ writeOptional:" << (*q)->tag() << " format:" << frmt << "])";
+        _M << sb;
+        writeOptMemberMarshalUnmarshalCode(_M, (*q)->type(), "self->" + name, true);
+        _M << eb;
+    }
+}
+
+void
+Slice::Gen::TypesVisitor::writeMemberUnmarshal(const DataMemberList& dataMembers, const DataMemberList& optionalMembers,
+                                               int baseType) const
+{
+    for(DataMemberList::const_iterator q = dataMembers.begin(); q != dataMembers.end(); ++q)
+    {
+        if(!(*q)->optional())
+        {
+            writeMarshalUnmarshalCode(_M, (*q)->type(), "self->" + fixId((*q)->name(), baseType), false, false);
+        }
+    }
+    for(DataMemberList::const_iterator q = optionalMembers.begin(); q != optionalMembers.end(); ++q)
+    {
+        string name = fixId((*q)->name(), baseType);
+        string frmt = getOptionalFormat((*q)->type());
+        _M << nl << "if([is_ readOptional:" << (*q)->tag() << " format:" << frmt << "])";
+        _M << sb;
+        _M << nl << "self->has_" << name << "__ = YES;";
+        writeOptMemberMarshalUnmarshalCode(_M, (*q)->type(), "self->" + name, false);
+        _M << eb;
+        _M << nl << "else";
+        _M << sb;
+        _M << nl << "self->has_" << name << "__ = NO;";
+        _M << eb;
+    }
+}
+
+Slice::Gen::ProxyVisitor::ProxyVisitor(Output& H, Output& M)
+    : ObjCVisitor(H, M)
+{
+}
+
+bool
+Slice::Gen::ProxyVisitor::visitClassDefStart(const ClassDefPtr& p)
+{
+    string name = fixName(p);
+    ClassList bases = p->bases();
+
+    _H << sp << nl << "@protocol " << name << "Prx <";
+    if(bases.empty())
+    {
+        _H << "ICEObjectPrx";
+    }
+    else
+    {
+        ClassList::const_iterator q = bases.begin();
+        while(q != bases.end())
+        {
+            _H << fixName(*q) + "Prx";
+            if(++q != bases.end())
+            {
+                _H << ", ";
+            }
+        }
+    }
+    _H << ">";
+
+    return true;
+}
+
+void
+Slice::Gen::ProxyVisitor::visitClassDefEnd(const ClassDefPtr&)
+{
+    _H << nl << "@end";
+}
+
+void
+Slice::Gen::ProxyVisitor::visitOperation(const OperationPtr& p)
+{
+    string name = getName(p);
+    TypePtr returnType = p->returnType();
+    string retString = outTypeToString(returnType, p->returnIsOptional());
+    string params = getParams(p);
+    string marshalParams = getMarshalParams(p);
+    string unmarshalParams = getUnmarshalParams(p);
+
+    //
+    // Write two versions of the operation--with and without a
+    // context parameter.
+    //
+    _H << nl << "-(" << retString << ") " << name << params << ";";
+
+    _H << nl << "-(" << retString << ") " << name << params;
+    if(!params.empty())
+    {
+        _H << " context";
+    }
+    _H << ":(ICEContext *)context;";
+
+    _H << nl << "-(id<ICEAsyncResult>) begin_" << p->name() << marshalParams << ";";
+    _H << nl << "-(id<ICEAsyncResult>) begin_" << p->name() << marshalParams;
+    if(!marshalParams.empty())
+    {
+        _H << " context";
+    }
+    _H << ":(ICEContext *)context;";
+
+    _H << nl << "-(" << retString << ") end_" << p->name() << unmarshalParams;
+    if(!unmarshalParams.empty())
+    {
+        _H << " result";
+    }
+    _H << ":(id<ICEAsyncResult>)result;";
+
+    string responseCBSig = getResponseCBSig(p);
+    _H << nl << "-(id<ICEAsyncResult>) begin_" << p->name() << marshalParams;
+    if(!marshalParams.empty())
+    {
+        _H << " response";
+    }
+    _H << ":(" << responseCBSig << ")response_ exception:(void(^)(ICEException*))exception_;";
+
+    _H << nl << "-(id<ICEAsyncResult>) begin_" << p->name() << marshalParams;
+    if(!marshalParams.empty())
+    {
+        _H << " context";
+    }
+    _H << ":(ICEContext *)context";
+    _H << " response:(" << responseCBSig << ")response_ exception:(void(^)(ICEException*))exception_;";
+
+    _H << nl << "-(id<ICEAsyncResult>) begin_" << p->name() << marshalParams;
+    if(!marshalParams.empty())
+    {
+        _H << " response";
+    }
+    _H << ":(" << responseCBSig << ")response_ exception:(void(^)(ICEException*))exception_ sent:(void(^)(BOOL))sent_;";
+
+    _H << nl << "-(id<ICEAsyncResult>) begin_" << p->name() << marshalParams;
+    if(!marshalParams.empty())
+    {
+        _H << " context";
+    }
+    _H << ":(ICEContext *)context";
+    _H << " response:(" << responseCBSig << ")response_ exception:(void(^)(ICEException*))exception_ sent:(void(^)(BOOL))sent_;";
+}
+
+Slice::Gen::HelperVisitor::HelperVisitor(Output& H, Output& M) :
+    ObjCVisitor(H, M)
+{
+}
+
+bool
+Slice::Gen::HelperVisitor::visitClassDefStart(const ClassDefPtr& p)
+{
+    //
+    // Proxy helper
+    // 
+    {
+        string name = moduleName(findModule(p)) + p->name() + "PrxHelper";
+        _H << sp << nl << "@interface " << name << " : ICEProxyHelper";
+        _H << nl << "@end";
+        
+        _M << sp << nl << "@implementation " << name;
+        _M << nl << "+(id) readRetained:(id<ICEInputStream>)stream";
+        _M << sb;
+        _M << nl << "return [stream newProxy:[" << fixName(p) << "Prx class]];";
+        _M << eb;
+        _M << nl << "@end";
+    }
+
+    //
+    // Class helper
+    //
+    {
+        string name = moduleName(findModule(p)) + p->name() + "Helper";
+        if(p->isInterface())
+        {
+            _H << sp << nl << "typedef ICEObjectHelper " << name << ";";
+        }
+        else
+        {
+            _H << sp << nl << "@interface " << name << " : ICEObjectHelper";
+            _H << nl << "@end";
+            
+            _M << sp << nl << "@implementation " << name;
+            _M << nl << "+(void) readRetained:(ICEObject*ICE_STRONG_QUALIFIER*)obj stream:(id<ICEInputStream>)stream";
+            _M << sb;
+            _M << nl << "[stream newObject:obj expectedType:[" << fixName(p) << " class]];";
+            _M << eb;
+            _M << nl << "@end";
+        }
+    }
+    return false;
+}
+
+void
+Slice::Gen::HelperVisitor::visitEnum(const EnumPtr& p)
+{
+    string name = moduleName(findModule(p)) + p->name() + "Helper";
+
+    _H << sp << nl << "@interface " << name << " : ICEEnumHelper";
+    _H << nl << "@end";
+
+    _M << sp << nl << "@implementation " << name;
+    _M << nl << "+(ICEInt) getMinValue";
+    _M << sb;
+    _M << nl << "return " << p->minValue() << ";";
+    _M << eb;
+    _M << nl << "+(ICEInt) getMaxValue";
+    _M << sb;
+    _M << nl << "return " << p->maxValue() << ";";
+    _M << eb;
+    _M << nl << "@end";
+}
+
+void
+Slice::Gen::HelperVisitor::visitSequence(const SequencePtr& p)
+{
+    string name = moduleName(findModule(p)) + p->name() + "Helper";
+
+    BuiltinPtr builtin = BuiltinPtr::dynamicCast(p->type());
+    if(builtin)
+    {
+        _H << sp << nl << "typedef ICE" << getBuiltinName(builtin) << "SequenceHelper " << name << ";";
+        return;
+    }
+
+    EnumPtr en = EnumPtr::dynamicCast(p->type());
+    if(en)
+    {
+        _H << sp << nl << "@interface " << name << " : ICEEnumSequenceHelper";
+        _H << nl << "@end";
+
+        string typeS = typeToString(en);
+        int min = en->minValue();
+        int max = en->maxValue();
+        _M << sp << nl << "@implementation " << name;
+        _M << nl << "+(id) readRetained:(id<ICEInputStream>)stream";
+        _M << sb;
+        _M << nl << "return [stream newEnumSeq:" << min << " max:" << max << "];";
+        _M << eb;
+        _M << nl << "+(void) write:(id)obj stream:(id<ICEOutputStream>)stream";
+        _M << sb;
+        _M << nl << "[stream writeEnumSeq:obj min:" << min << " max:" << max << "];";
+        _M << eb;
+        _M << nl << "@end";
+        return;
+    }
+
+    ClassDeclPtr cl = ClassDeclPtr::dynamicCast(p->type());
+    if(cl)
+    {
+        _H << sp << nl << "@interface " << name << " : ICEObjectSequenceHelper";
+        _H << nl << "@end";
+
+        _M << sp << nl << "@implementation " << name;
+        _M << nl << "+(id) readRetained:(id<ICEInputStream>)stream";
+        _M << sb;
+        _M << nl << "return [stream newObjectSeq:[" << fixName(cl) << " class]];";
+        _M << eb;
+        _M << nl << "@end";
+        return;
+    }
+
+    ProxyPtr proxy = ProxyPtr::dynamicCast(p->type());
+    ContainedPtr contained = ContainedPtr::dynamicCast(p->type());
+    _H << sp << nl << "@interface " << name << " : ICEArraySequenceHelper";
+    _H << nl << "@end";
+
+    _M << sp << nl << "@implementation " << name;
+    _M << nl << "+(Class) getElementHelper";
+    _M << sb;
+    if(proxy)
+    {
+        string name = moduleName(findModule(proxy->_class())) + proxy->_class()->name();
+        _M << nl << "return [" << name << "PrxHelper class];";
+    }
+    else
+    {
+        assert(contained);
+        _M << nl << "return [" << moduleName(findModule(contained)) + contained->name() + "Helper class];";
+    }
+    _M << eb;
+    _M << nl << "+(Class) getOptionalHelper";
+    _M << sb;
+    if(p->type()->isVariableLength())
+    {
+        _M << nl << "return [ICEVarLengthOptionalHelper class];";
+    }
+    else if(p->type()->minWireSize() == 1)
+    {
+        _M << nl << "return [ICEFixedSize1SequenceOptionalHelper class];";
+    }
+    else
+    {
+        _M << nl << "return [ICEFixedSequenceOptionalHelper class];";
+    }
+    _M << eb;
+    _M << nl << "@end";
+}
+
+void
+Slice::Gen::HelperVisitor::visitDictionary(const DictionaryPtr& p)
+{
+    string name = moduleName(findModule(p)) + p->name() + "Helper";
+
+    TypePtr keyType = p->keyType();
+    string keyS;
+    BuiltinPtr keyBuiltin = BuiltinPtr::dynamicCast(keyType);
+    if(keyBuiltin)
+    {
+        keyS = "ICE" + getBuiltinName(BuiltinPtr::dynamicCast(keyType)) + "Helper";
+    }
+    else
+    {
+        ContainedPtr contained = ContainedPtr::dynamicCast(keyType);
+        keyS = moduleName(findModule(contained)) + contained->name() + "Helper";
+    }
+
+    string valueS;
+    TypePtr valueType = p->valueType();
+    BuiltinPtr valueBuiltin = BuiltinPtr::dynamicCast(valueType);
+    ClassDeclPtr valueClass = ClassDeclPtr::dynamicCast(valueType);
+    if((valueBuiltin && valueBuiltin->kind() == Builtin::KindObject) || valueClass)
+    {
+        _H << sp << nl << "@interface " << name << " : ICEObjectDictionaryHelper";
+        _H << nl << "@end";
+        
+        _M << sp << nl << "@implementation " << name;
+        _M << nl << "+(id) readRetained:(id<ICEInputStream>)stream";
+        _M << sb;
+        if(valueClass && !valueClass->isInterface())
+        {
+            valueS = fixName(valueClass);
+            _M << nl << "return [stream newObjectDict:[" << keyS << " class] expectedType:[" << valueS << " class]];";
+        }
+        else
+        {
+            _M << nl << "return [stream newObjectDict:[" << keyS << " class] expectedType:[ICEObject class]];";
+        }
+        _M << eb;
+        _M << nl << "+(void) write:(id)obj stream:(id<ICEOutputStream>)stream";
+        _M << sb;
+        _M << nl << "[stream writeObjectDict:obj helper:[" << keyS << " class]];";
+        _M << eb;
+        _M << nl << "@end";
+        return;
+    }
+
+    ProxyPtr valueProxy = ProxyPtr::dynamicCast(valueType);
+    if(valueBuiltin)
+    {
+        valueS = "ICE" + getBuiltinName(BuiltinPtr::dynamicCast(valueType)) + "Helper";
+    }
+    else if(valueProxy)
+    {
+        valueS = moduleName(findModule(valueProxy->_class())) + valueProxy->_class()->name() + "PrxHelper";
+    }
+    else
+    {
+        ContainedPtr contained = ContainedPtr::dynamicCast(valueType);
+        valueS = moduleName(findModule(contained)) + contained->name() + "Helper";
+    }
+    _H << sp << nl << "@interface " << name << " : ICEDictionaryHelper";
+    _H << nl << "@end";
+
+    _M << sp << nl << "@implementation " << name;
+    _M << nl << "+(ICEKeyValueTypeHelper) getKeyValueHelper";
+    _M << sb;
+    _M << nl << "ICEKeyValueTypeHelper c;";
+    _M << nl << "c.key = [" << keyS << " class];";
+    _M << nl << "c.value = [" << valueS << " class];";
+    _M << nl << "return c;";
+    _M << eb;
+    _M << nl << "+(Class) getOptionalHelper";
+    _M << sb;
+    if(keyType->isVariableLength() || valueType->isVariableLength())
+    {
+        _M << nl << "return [ICEVarLengthOptionalHelper class];";
+    }
+    else
+    {
+        _M << nl << "return [ICEFixedDictionaryOptionalHelper class];";
+    }
+    _M << eb;
+    _M << nl << "@end";
+}
+
+
+bool
+Slice::Gen::HelperVisitor::visitStructStart(const StructPtr& p)
+{
+    string name = fixName(p);
+
+    _H << sp << nl << "@interface " << name  << "Helper : ICEStructHelper";
+    _H << nl << "@end";
+
+    _M << sp << nl << "@implementation " << name << "Helper";
+
+    _M << nl << "+(Class) getType";
+    _M << sb;
+    _M << nl << "return [" << name << " class];";
+    _M << eb;
+    _M << nl << "+(Class) getOptionalHelper";
+    _M << sb;
+    if(p->isVariableLength())
+    {
+        _M << nl << "return [ICEVarLengthOptionalHelper class];";
+    }
+    else
+    {
+        _M << nl << "return [ICEFixedLengthOptionalHelper class];";
+    }
+    _M << eb;
+
+    _M << nl << "+(ICEInt) minWireSize";
+    _M << sb;
+    _M << nl << "return " << p->minWireSize() << ";";
+    _M << eb;
+
+    _M << nl << "@end";
+    return false;
+}
+
+Slice::Gen::DelegateMVisitor::DelegateMVisitor(Output& H, Output& M)
+    : ObjCVisitor(H, M)
+{
+}
+
+bool
+Slice::Gen::DelegateMVisitor::visitModuleStart(const ModulePtr& p)
+{
+    return true;
+}
+
+void
+Slice::Gen::DelegateMVisitor::visitModuleEnd(const ModulePtr&)
+{
+}
+
+bool
+Slice::Gen::DelegateMVisitor::visitClassDefStart(const ClassDefPtr& p)
+{
+    string name = fixName(p);
+    ClassList bases = p->bases();
+    OperationList ops = p->allOperations();
+    OperationList::const_iterator r;
+
+    _H << sp << nl << "@interface " << name << "Prx : ICEObjectPrx <" << name << "Prx>";
+    _H << nl << "+(NSString *) ice_staticId;";
+    
+    _M << sp << nl << "@implementation " << name << "Prx";
+    for(r = ops.begin(); r != ops.end(); ++r)
+    {
+        string opName = getName(*r);
+        TypePtr returnType = (*r)->returnType();
+        string retString = outTypeToString(returnType, (*r)->returnIsOptional());
+        string params = getParams(*r);
+        string args = getArgs(*r);
+
+        ParamDeclList inParams;
+        ParamDeclList outParams;
+        ParamDeclList paramList = (*r)->parameters();
+        for(ParamDeclList::const_iterator pli = paramList.begin(); pli != paramList.end(); ++pli)
+        {
+            if((*pli)->isOutParam())
+            {
+                outParams.push_back(*pli);
+            }
+            else
+            {
+                inParams.push_back(*pli);
+            }
+        }
+
+        ContainerPtr container = (*r)->container();
+        ClassDefPtr cl = ClassDefPtr::dynamicCast(container);
+        string className = fixName(cl);
+
+        //
+        // Write context-less operation that forwards to the version with a context.
+        //
+        _M << sp << nl << "-(" << retString << ") " << opName << params;
+        _M << sb;
+        _M << nl;
+        if(returnType)
+        {
+            _M << "return ";
+        }
+        _M << "[self " << opName << args << (args.empty() ? ":nil" : " context:nil") << "];";
+        _M << eb;
+
+        //
+        // Write version with context.
+        //
+        _M << sp << nl << "-(" << retString << ") " << opName << params;
+        if(!params.empty())
+        {
+            _M << " context";
+        }
+        _M << ":(ICEContext *)ctx_";
+        _M << sb;
+        if(returnType)
+        {
+            _M << nl << "__block " << retString << " ret_";
+            if(!isValueType(returnType))
+            {
+                _M << " = nil;";
+            }
+            else
+            {
+                _M << ";";
+            }
+        }        
+
+        string marshal;
+        string marshalArgs = getMarshalArgs(*r);
+        string marshalParams = getMarshalParams(*r);
+        if(!inParams.empty())
+        {
+            _M << nl << "ICEMarshalCB marshal_ = ^(id<ICEOutputStream> os_) ";
+            _M << "{ [" << className << "Prx " << (*r)->name() << "_marshal___" << marshalArgs;
+            _M << (marshalArgs.empty() ? ":os_" : " os:os_") << "]; };";
+            marshal = "marshal_";
+        }
+        else
+        {
+            marshal = "nil";
+        }
+
+        string unmarshal;
+        string unmarshalArgs = getUnmarshalArgs(*r);
+        string unmarshalParams = getUnmarshalParams(*r);
+        if((*r)->returnsData())
+        {
+            _M << nl << "ICEUnmarshalCB unmarshal_ = ^(id<ICEInputStream> is_, BOOL ok_) ";
+            if(returnType)
+            {
+                _M << "{ ret_ = ";
+            }
+            else
+            {
+                _M << "{ ";
+            }
+            _M << "[" << className << "Prx " << (*r)->name() << "_unmarshal___" << unmarshalArgs;
+            _M << (unmarshalArgs.empty() ? ":is_" : " is:is_") << " ok:ok_]; };";
+            unmarshal = "unmarshal_";
+        }
+        else 
+        {
+            unmarshal = "nil";
+        }
+
+        _M << nl << "[self invoke__:@\"" << (*r)->name() <<  "\" mode:" << sliceModeToIceMode((*r)->sendMode())
+           << " format:" << opFormatTypeToString(*r) << " marshal:" << marshal 
+           << " unmarshal:" << unmarshal << " context:ctx_];";
+        if(returnType)
+        {
+            _M << nl << "return ret_;";
+        }
+        _M << eb;
+
+        //
+        // Write begin_ context-less operation that forwards to the version with a context.
+        //
+        _M << sp << nl << "-(id<ICEAsyncResult>) begin_" << (*r)->name() << marshalParams;
+        _M << sb;
+        _M << nl << "return [self begin_" << (*r)->name() << marshalArgs;
+        _M << (marshalArgs.empty() ? "" : " context") << ":nil];";
+        _M << eb;
+                
+        //
+        // Write begin_ version with context.
+        //
+        _M << sp << nl << "-(id<ICEAsyncResult>) begin_" << (*r)->name() << marshalParams;
+        _M << (marshalParams.empty() ? "" : " context") << ":(ICEContext *)ctx_";
+        _M << sb;
+        if(!inParams.empty())
+        {
+            _M << nl << "ICEMarshalCB marshal_ = ^(id<ICEOutputStream> os_) ";
+            _M << "{ [" << className << "Prx " << (*r)->name() << "_marshal___" << marshalArgs;
+            _M << (marshalArgs.empty() ? "" : " os") << ":os_]; };";
+        }
+        _M << nl << "return [self begin_invoke__:@\"" << (*r)->name() <<  "\" mode:" 
+           << sliceModeToIceMode((*r)->sendMode()) << " format:" << opFormatTypeToString(*r)
+           << " marshal:" << marshal
+           << " returnsData:" << ((*r)->returnsData() ? "YES" : "NO")
+           << " context:ctx_];";
+        _M << eb;
+
+        //
+        // Write end_ operation
+        // 
+        _M << sp << nl << "-(" << retString << ") end_" << (*r)->name() << unmarshalParams;
+        if(!unmarshalParams.empty())
+        {
+            _M << " result";
+        }
+        _M << ":(id<ICEAsyncResult>)result_";
+        _M << sb;
+        if(returnType)
+        {
+            _M << nl << "__block " << retString << " ret_";
+            if(!isValueType(returnType))
+            {
+                _M << " = nil;";
+            }
+            else
+            {
+                _M << ";";
+            }
+        }        
+        if((*r)->returnsData())
+        {
+            _M << nl << "ICEUnmarshalCB unmarshal_ = ^(id<ICEInputStream> is_, BOOL ok_) ";
+            if(returnType)
+            {
+                _M << "{ ret_ = ";
+            }
+            else
+            {
+                _M << "{ ";
+            }
+            _M << "[" << className << "Prx " << (*r)->name() << "_unmarshal___" << unmarshalArgs;
+            _M << (unmarshalArgs.empty() ? ":is_" : " is:is_") << " ok:ok_]; };";
+        }
+        _M << nl << "[self end_invoke__:@\"" << (*r)->name() << "\" unmarshal:" << unmarshal << " result:result_];";
+        if(returnType)
+        {
+            _M << nl << "return ret_;";
+        }
+        _M << eb;
+
+        //
+        // Write begin_ operations with callbacks
+        //
+        string responseCBSig = getResponseCBSig(*r);
+
+        _M << sp << nl << "-(id<ICEAsyncResult>) begin_" << (*r)->name() << marshalParams;
+        _M << (marshalParams.empty() ? "" : " response") << ":(" << responseCBSig << ")response_";
+        _M << " exception:(void(^)(ICEException*))exception_";
+        _M << sb;
+        _M << nl << "return [self begin_" << (*r)->name() << marshalArgs;
+        _M << (marshalArgs.empty() ? "" : " context") << ":nil response:response_ exception:exception_ sent:nil];";
+        _M << eb;
+
+        _M << sp << nl << "-(id<ICEAsyncResult>) begin_" << (*r)->name() << marshalParams;
+        _M << (marshalParams.empty() ? "" : " response") << ":(" << responseCBSig << ")response_";
+        _M << " exception:(void(^)(ICEException*))exception_ sent:(void(^)(BOOL))sent_";
+        _M << sb;
+        _M << nl << "return [self begin_" << (*r)->name() << marshalArgs;
+        _M << (marshalArgs.empty() ? "" : " context") << ":nil response:response_ exception:exception_ sent:sent_];";
+        _M << eb;
+
+        _M << sp << nl << "-(id<ICEAsyncResult>) begin_" << (*r)->name() << marshalParams;
+        _M << (marshalParams.empty() ? "" : " context") << ":(ICEContext*)ctx_";
+        _M << " response:(" << responseCBSig << ")response_ exception:(void(^)(ICEException*))exception_ ";
+        _M << sb;
+        _M << nl << "return [self begin_" << (*r)->name() << marshalArgs;
+        _M << (marshalArgs.empty() ? "" : " context") << ":ctx_ response:response_ exception:exception_ sent:nil];";
+        _M << eb;
+
+        _M << sp << nl << "-(id<ICEAsyncResult>) begin_" << (*r)->name() << marshalParams;
+        _M << (marshalParams.empty() ? "" : " context") << ":(ICEContext*)ctx_";
+        _M << " response:(" << responseCBSig << ")response_ exception:(void(^)(ICEException*))exception_ ";
+        _M << " sent:(void(^)(BOOL))sent_";
+        _M << sb;
+        if(!inParams.empty())
+        {
+            _M << nl << "ICEMarshalCB marshal_ = ^(id<ICEOutputStream> os_) ";
+            _M << "{ [" << className << "Prx " << (*r)->name() << "_marshal___" << marshalArgs;
+            _M << (marshalArgs.empty() ? "" : " os") << ":os_]; };";
+        }
+        if((*r)->returnsData())
+        {
+            _M << nl << "void(^completed_)(id<ICEInputStream>, BOOL) = ^(id<ICEInputStream> is_, BOOL ok_)";
+            _M << sb;
+            string responseCallArgs;
+            string unmarshalCallArgs;
+            if(!outParams.empty() || returnType)
+            {
+                if(returnType)
+                {
+                    responseCallArgs += "ret_";
+                }
+
+                for(ParamDeclList::const_iterator op = outParams.begin(); op != outParams.end(); ++op)
+                {
+                    string name = fixId((*op)->name());
+                    _M << nl << outTypeToString((*op)->type(), (*op)->optional(), true) << " " << name;
+                    if(!isValueType((*op)->type()))
+                    {
+                        _M << " = nil";
+                    }
+                    _M << ";";
+
+                    if(!unmarshalCallArgs.empty())
+                    {
+                        unmarshalCallArgs += " " + name;
+                    }
+                    unmarshalCallArgs += ":&" + name;
+
+                    if(!responseCallArgs.empty())
+                    {
+                        responseCallArgs += ", ";
+                    }
+                    responseCallArgs += name;
+                }
+                if(returnType)
+                {
+                    _M << nl << outTypeToString(returnType, (*r)->returnIsOptional(), true) << " ret_";
+                    if(!isValueType(returnType))
+                    {
+                        _M << " = nil";
+                    }
+                    _M << ";";
+                }
+            }
+            _M << nl << "@try";
+            _M << sb;
+            _M << nl;
+            if(returnType)
+            {
+                _M << "ret_ = ";
+            }
+            _M << "[" << className << "Prx " << (*r)->name() << "_unmarshal___" << unmarshalCallArgs;
+            _M << (unmarshalCallArgs.empty() ? ":is_" : " is:is_") << " ok:ok_];";
+            _M << eb;
+            _M << nl << "@catch(ICEException* ex)";
+            _M << sb;
+            _M << nl << "if(exception_)";
+            _M << sb;
+            _M << nl << "exception_(ex);";
+            _M << eb;
+            _M << nl << "return;";
+            _M << eb;
+            _M << nl << "if(response_)";
+            _M << sb;
+            _M << nl << "response_(" << responseCallArgs << ");";
+            _M << eb;
+            _M << eb << ";";
+            if(returnType || !outParams.empty())
+            {
+                _M << nl << "return [self begin_invoke__:@\"" << (*r)->name() <<  "\" mode:" 
+                   << sliceModeToIceMode((*r)->sendMode()) << " format:" << opFormatTypeToString(*r)
+                   << " marshal:" << marshal 
+                   << " completed:completed_ response:(response_ != nil) exception:exception_ sent:sent_ context:ctx_];";
+            }
+            else
+            {
+                _M << nl << "return [self begin_invoke__:@\"" << (*r)->name() <<  "\" mode:" 
+                   << sliceModeToIceMode((*r)->sendMode()) << " format:" << opFormatTypeToString(*r)
+                   << " marshal:" << marshal << " completed:completed_ response:YES exception:exception_ sent:sent_ context:ctx_];";
+            }
+        }
+        else
+        {
+            _M << nl << "return [self begin_invoke__:@\"" << (*r)->name() <<  "\" mode:" 
+               << sliceModeToIceMode((*r)->sendMode()) << " format:" << opFormatTypeToString(*r)
+               << " marshal:" << marshal << " response:response_ exception:exception_ sent:sent_ context:ctx_];";
+        }
+        _M << eb;
+    }
+
+    _M << sp << nl << "+(NSString *) ice_staticId";
+    _M << sb;
+    _M << nl << "return @\"" << p->scoped() << "\";";
+    _M << eb;
+
+    return true;
+}
+
+void
+Slice::Gen::DelegateMVisitor::visitClassDefEnd(const ClassDefPtr& p)
+{
+    _H << nl << "@end";
+    _M << nl << "@end";
+}
+
+void
+Slice::Gen::DelegateMVisitor::visitOperation(const OperationPtr& p)
+{
+    TypePtr returnType = p->returnType();
+    string retString = outTypeToString(returnType, p->returnIsOptional());
+    string params = getParams(p);
+    string args = getParams(p);
+    string marshalParams = getMarshalParams(p);
+    string unmarshalParams = getUnmarshalParams(p);
+
+    ParamDeclList inParams;
+    ParamDeclList outParams;
+    ParamDeclList paramList = p->parameters();
+    for(ParamDeclList::const_iterator pli = paramList.begin(); pli != paramList.end(); ++pli)
+    {
+        if((*pli)->isOutParam())
+        {
+            outParams.push_back(*pli);
+        }
+        else
+        {
+            inParams.push_back(*pli);
+        }
+    }
+
+    //
+    // Write class method to invoke each operation.
+    //
+    ContainerPtr container = p->container();
+    ClassDefPtr cl = ClassDefPtr::dynamicCast(container);
+    string className = fixName(cl);
+    if(!inParams.empty())
+    {
+        _H << nl << "+(void) " << p->name() << "_marshal___" << marshalParams;
+        if(!marshalParams.empty())
+        {
+            _H << " os";
+        }
+        _H << ":(id<ICEOutputStream>)os_;";
+            
+        _M << sp << nl << "+(void) " << p->name() << "_marshal___" << marshalParams;
+        if(!marshalParams.empty())
+        {
+            _M << " os";
+        }
+        _M << ":(id<ICEOutputStream>)os_";
+        _M << sb;
+        writeMarshalUnmarshalParams(inParams, 0, true);
+        if(p->sendsClasses(false))
+        {
+            _M << nl << "[os_ writePendingObjects];";
+        }
+        _M << eb;
+    }
+
+    if(p->returnsData())
+    {
+        _H << nl << "+(" << retString << ")" << p->name() << "_unmarshal___" << unmarshalParams;
+        if(!unmarshalParams.empty())
+        {
+            _H << " is";
+        }
+        _H << ":(id<ICEInputStream>)is_ ok:(BOOL)ok_;";
+
+        _M << nl << "+(" << retString << ")" << p->name() << "_unmarshal___" << unmarshalParams;
+        if(!unmarshalParams.empty())
+        {
+            _M << " is";
+        }
+        _M << ":(id<ICEInputStream>)is_ ok:(BOOL)ok_";
+        _M << sb;
+        if(returnType)
+        {
+            _M << nl << outTypeToString(returnType, p->returnIsOptional(), true) << " ret_";
+            if(!isValueType(returnType))
+            {
+                _M << " = nil;";
+            }
+            else
+            {
+                _M << ";";
+            }
+        }
+        if(p->returnsData())
+        {
+            for(ParamDeclList::const_iterator op = outParams.begin(); op != outParams.end(); ++op)
+            {
+                if(!isValueType((*op)->type()))
+                {
+                    _M << nl << "*" << fixId((*op)->name()) << " = nil;";
+                }
+            }
+        }
+        _M << nl << "if(!ok_)";
+        _M << sb;
+        _M << nl << "@try";
+        _M << sb;
+        _M << nl << "[is_ startEncapsulation];";
+        _M << nl << "[is_ throwException];";
+        _M << eb;
+        //
+        // Arrange exceptions into most-derived to least-derived order. If we don't
+        // do this, a base exception handler can appear before a derived exception
+        // handler, causing compiler warnings and resulting in the base exception
+        // being marshaled instead of the derived exception.
+        //
+        ExceptionList throws = p->throws();
+        throws.sort();
+        throws.unique();
+        throws.sort(Slice::DerivedToBaseCompare());
+
+        for(ExceptionList::const_iterator e = throws.begin(); e != throws.end(); ++e)
+        {
+            _M << nl << "@catch(" << fixName(*e) << " *ex_)";
+            _M << sb;
+            _M << nl << "[is_ endEncapsulation];";
+            _M << nl << "@throw;";
+            _M << eb;
+        }
+        _M << nl << "@catch(ICEUserException *ex_)";
+        _M << sb;
+        _M << nl << "[is_ endEncapsulation];";
+        _M << nl << "@throw [ICEUnknownUserException unknownUserException:__FILE__ line:__LINE__ "
+           << "unknown:[ex_ ice_name]];";
+        _M << eb;
+        _M << eb;
+
+        if(returnType || !outParams.empty())
+        {
+            _M << nl << "else";
+            _M << sb;
+            _M << nl << "[is_ startEncapsulation];";
+            writeMarshalUnmarshalParams(outParams, p, false, true);
+            if(p->returnsClasses(false))
+            {
+                _M << nl << "[is_ readPendingObjects];";
+            }
+            _M << nl << "[is_ endEncapsulation];";
+            _M << eb;
+        }
+        
+        if(returnType)
+        {
+            _M << nl << "return ret_;";
+        }
+        _M << eb;
+    }
+}
+
diff --git a/cpp/src/slice2objc/Gen.h b/cpp/src/slice2objc/Gen.h
new file mode 100644
index 00000000000..2126057137e
--- /dev/null
+++ b/cpp/src/slice2objc/Gen.h
@@ -0,0 +1,186 @@
+// **********************************************************************
+//
+// Copyright (c) 2003-2014 ZeroC, Inc. All rights reserved.
+//
+// This copy of Ice is licensed to you under the terms described in the
+// ICE_LICENSE file included in this distribution.
+//
+// **********************************************************************
+
+#ifndef GEN_H
+#define GEN_H
+
+#include <Slice/ObjCUtil.h>
+
+namespace Slice
+{
+
+
+class ObjCVisitor : public ObjCGenerator, public ParserVisitor
+{
+public:
+
+    ObjCVisitor(::IceUtilInternal::Output&, ::IceUtilInternal::Output&);
+    virtual ~ObjCVisitor();
+
+protected:
+
+    virtual void writeDispatchAndMarshalling(const ClassDefPtr&);
+    virtual void writeMarshalUnmarshalParams(const ParamDeclList&, const OperationPtr&, bool, bool = false);
+    virtual std::string getName(const OperationPtr&) const;
+    virtual std::string getSelector(const OperationPtr&) const;
+    virtual std::string getParams(const OperationPtr&) const;
+    virtual std::string getMarshalParams(const OperationPtr&) const;
+    virtual std::string getUnmarshalParams(const OperationPtr&) const;
+    virtual std::string getServerParams(const OperationPtr&) const;
+    virtual std::string getResponseCBSig(const OperationPtr&) const;
+    virtual std::string getArgs(const OperationPtr&) const;
+    virtual std::string getMarshalArgs(const OperationPtr&) const;
+    virtual std::string getUnmarshalArgs(const OperationPtr&) const;
+    virtual std::string getServerArgs(const OperationPtr&) const;
+
+    ::IceUtilInternal::Output& _H;
+    ::IceUtilInternal::Output& _M;
+};
+
+class Gen : private ::IceUtil::noncopyable
+{
+public:
+
+    Gen(const std::string&,
+        const std::string&,
+        const std::string&,
+        const std::vector<std::string>&,
+        const std::string&);
+    ~Gen();
+
+    bool operator!() const; // Returns true if there was a constructor error
+
+    void generate(const UnitPtr&);
+    void closeOutput();
+
+private:
+
+    IceUtilInternal::Output _H;
+    IceUtilInternal::Output _M;
+
+    std::string _base;
+    std::string _include;
+    std::vector<std::string> _includePaths;
+
+    void printHeader(::IceUtilInternal::Output&);
+
+    class UnitVisitor : public ObjCVisitor
+    {
+    public:
+
+        UnitVisitor(::IceUtilInternal::Output&, ::IceUtilInternal::Output&);
+
+        virtual bool visitModuleStart(const ModulePtr&);
+        virtual void visitUnitEnd(const UnitPtr&);
+
+    private:
+
+        std::vector<Slice::ObjCGenerator::ModulePrefix> _prefixes;
+    };
+
+    class ObjectDeclVisitor : public ObjCVisitor
+    {
+    public:
+
+        ObjectDeclVisitor(::IceUtilInternal::Output&, ::IceUtilInternal::Output&);
+
+        virtual void visitClassDecl(const ClassDeclPtr&);
+    };
+
+    class ProxyDeclVisitor : public ObjCVisitor
+    {
+    public:
+
+        ProxyDeclVisitor(::IceUtilInternal::Output&, ::IceUtilInternal::Output&);
+
+        virtual void visitClassDecl(const ClassDeclPtr&);
+    };
+
+    class TypesVisitor : public ObjCVisitor
+    {
+    public:
+
+        TypesVisitor(::IceUtilInternal::Output&, ::IceUtilInternal::Output&);
+
+        virtual bool visitModuleStart(const ModulePtr&);
+        virtual void visitModuleEnd(const ModulePtr&);
+        virtual bool visitClassDefStart(const ClassDefPtr&);
+        virtual void visitOperation(const OperationPtr&);
+        virtual void visitClassDefEnd(const ClassDefPtr&);
+        virtual bool visitExceptionStart(const ExceptionPtr&);
+        virtual void visitExceptionEnd(const ExceptionPtr&);
+        virtual bool visitStructStart(const StructPtr&);
+        virtual void visitStructEnd(const StructPtr&);
+        virtual void visitSequence(const SequencePtr&);
+        virtual void visitDictionary(const DictionaryPtr&);
+        virtual void visitEnum(const EnumPtr&);
+        virtual void visitConst(const ConstPtr&);
+
+    private:
+
+        enum Escape { NoEscape, WithEscape };
+        enum ContainerType { LocalException, Other };
+
+        void writeConstantValue(IceUtilInternal::Output&, const TypePtr&, const std::string&) const;
+        void writeMembers(const DataMemberList&, int) const;
+        void writeMemberSignature(const DataMemberList&, int, ContainerType) const;
+        void writeMemberCall(const DataMemberList&, int, ContainerType, Escape) const;
+        void writeMemberDefaultValueInit(const DataMemberList&, int) const;
+        void writeMemberInit(const DataMemberList&, int) const;
+        void writeProperties(const DataMemberList&, int) const;
+        void writeSynthesize(const DataMemberList&, int) const; 
+        void writeOptionalDataMemberSelectors(const DataMemberList&, int) const;
+        void writeMemberHashCode(const DataMemberList&, int) const;
+        void writeMemberEquals(const DataMemberList&, int) const;
+        void writeMemberDealloc(const DataMemberList&, int, bool slicedData = false) const;
+        void writeMemberMarshal(const DataMemberList&, const DataMemberList&, int) const;
+        void writeMemberUnmarshal(const DataMemberList&, const DataMemberList&, int) const;
+    };
+
+    class ProxyVisitor : public ObjCVisitor
+    {
+    public:
+
+        ProxyVisitor(::IceUtilInternal::Output&, ::IceUtilInternal::Output&);
+
+        virtual bool visitClassDefStart(const ClassDefPtr&);
+        virtual void visitClassDefEnd(const ClassDefPtr&);
+        virtual void visitOperation(const OperationPtr&);
+    };
+
+    class HelperVisitor : public ObjCVisitor
+    {
+    public:
+
+        HelperVisitor(::IceUtilInternal::Output&, ::IceUtilInternal::Output&);
+
+        virtual bool visitClassDefStart(const ClassDefPtr&);
+        virtual void visitEnum(const EnumPtr&);
+        virtual void visitSequence(const SequencePtr&);
+        virtual void visitDictionary(const DictionaryPtr&);
+        virtual bool visitStructStart(const StructPtr&);
+    };
+
+    class DelegateMVisitor : public ObjCVisitor
+    {
+    public:
+
+        DelegateMVisitor(::IceUtilInternal::Output&, ::IceUtilInternal::Output&);
+
+        virtual bool visitModuleStart(const ModulePtr&);
+        virtual void visitModuleEnd(const ModulePtr&);
+        virtual bool visitClassDefStart(const ClassDefPtr&);
+        virtual void visitClassDefEnd(const ClassDefPtr&);
+        virtual void visitOperation(const OperationPtr&);
+    };
+};
+
+}
+
+#endif
diff --git a/cpp/src/slice2objc/Main.cpp b/cpp/src/slice2objc/Main.cpp
new file mode 100644
index 00000000000..529c54134b2
--- /dev/null
+++ b/cpp/src/slice2objc/Main.cpp
@@ -0,0 +1,290 @@
+// **********************************************************************
+//
+// Copyright (c) 2003-2014 ZeroC, Inc. All rights reserved.
+//
+// This copy of Ice is licensed to you under the terms described in the
+// ICE_LICENSE file included in this distribution.
+//
+// **********************************************************************
+
+#include <IceUtil/Options.h>
+#include <Slice/Preprocessor.h>
+#include <Slice/FileTracker.h>
+#include <IceUtil/CtrlCHandler.h>
+#include <IceUtil/Mutex.h>
+#include <IceUtil/MutexPtrLock.h>
+#include <Slice/Util.h>
+#include <Gen.h>
+
+using namespace std;
+using namespace Slice;
+
+namespace
+{
+
+IceUtil::Mutex* globalMutex = 0;
+bool interrupted = false;
+
+class Init
+{
+public:
+
+    Init()
+    {
+        globalMutex = new IceUtil::Mutex;
+    }
+
+    ~Init()
+    {
+        delete globalMutex;
+        globalMutex = 0;
+    }
+};
+
+Init init;
+
+}
+
+void
+interruptedCallback(int signal)
+{
+    IceUtilInternal::MutexPtrLock<IceUtil::Mutex> sync(globalMutex);
+    interrupted = true;
+}
+
+void
+usage(const char* n)
+{
+    cerr << "Usage: " << n << " [options] slice-files...\n";
+    cerr <<        
+        "Options:\n"
+        "-h, --help              Show this message.\n"
+        "-v, --version           Display the Ice version.\n"
+        "-DNAME                  Define NAME as 1.\n"
+        "-DNAME=DEF              Define NAME as DEF.\n"
+        "-UNAME                  Remove any definition for NAME.\n"
+        "-IDIR                   Put DIR in the include file search path.\n"
+        "-E                      Print preprocessor output on stdout.\n"
+        "--include-dir DIR       Use DIR as the header include directory in source files.\n"
+        "--output-dir DIR        Create files in the directory DIR.\n"
+        "--depend                Generate Makefile dependencies.\n"
+        "--depend-xml            Generate dependencies in XML format.\n"
+        "-d, --debug             Print debug messages.\n"
+        "--ice                   Permit `Ice' prefix (for building Ice source code only)\n"
+        "--underscore            Permit underscores in Slice identifiers.\n"
+        ;
+    // Note: --case-sensitive is intentionally not shown here!
+}
+
+int
+main(int argc, char* argv[])
+{
+    IceUtilInternal::Options opts;
+    opts.addOpt("h", "help");
+    opts.addOpt("v", "version");
+    opts.addOpt("D", "", IceUtilInternal::Options::NeedArg, "", IceUtilInternal::Options::Repeat);
+    opts.addOpt("U", "", IceUtilInternal::Options::NeedArg, "", IceUtilInternal::Options::Repeat);
+    opts.addOpt("I", "", IceUtilInternal::Options::NeedArg, "", IceUtilInternal::Options::Repeat);
+    opts.addOpt("E");
+    opts.addOpt("", "include-dir", IceUtilInternal::Options::NeedArg);
+    opts.addOpt("", "output-dir", IceUtilInternal::Options::NeedArg);
+    opts.addOpt("", "depend");
+    opts.addOpt("", "depend-xml");
+    opts.addOpt("d", "debug");
+    opts.addOpt("", "ice");
+    opts.addOpt("", "underscore");
+    opts.addOpt("", "case-sensitive");
+
+    vector<string> args;
+    try
+    {
+        args = opts.parse(argc, (const char**)argv);
+    }
+    catch(const IceUtilInternal::BadOptException& e)
+    {
+        cerr << argv[0] << ": " << e.reason << endl;
+        usage(argv[0]);
+        return EXIT_FAILURE;
+    }
+
+    if(opts.isSet("help"))
+    {
+        usage(argv[0]);
+        return EXIT_SUCCESS;
+    }
+
+    if(opts.isSet("version"))
+    {
+        cout << ICE_STRING_VERSION << endl;
+        return EXIT_SUCCESS;
+    }
+
+    vector<string> cppArgs;
+    vector<string> optargs = opts.argVec("D");
+    vector<string>::const_iterator i;
+    for(i = optargs.begin(); i != optargs.end(); ++i)
+    {
+        cppArgs.push_back("-D" + *i);
+    }
+
+    optargs = opts.argVec("U");
+    for(i = optargs.begin(); i != optargs.end(); ++i)
+    {
+        cppArgs.push_back("-U" + *i);
+    }
+
+    vector<string> includePaths = opts.argVec("I");
+    for(i = includePaths.begin(); i != includePaths.end(); ++i)
+    {
+        cppArgs.push_back("-I" + Preprocessor::normalizeIncludePath(*i));
+    }
+
+    bool preprocess = opts.isSet("E");
+
+    string include = opts.optArg("include-dir");
+
+    string output = opts.optArg("output-dir");
+
+    bool depend = opts.isSet("depend");
+    bool dependxml = opts.isSet("depend-xml");
+
+    bool debug = opts.isSet("debug");
+
+    bool ice = opts.isSet("ice");
+
+    bool underscore = opts.isSet("underscore");
+
+    if(args.empty())
+    {
+        getErrorStream() << argv[0] << ": no input file" << endl;
+        usage(argv[0]);
+        return EXIT_FAILURE;
+    }
+
+    int status = EXIT_SUCCESS;
+
+    if(dependxml)
+    {
+        cout << "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<dependencies>" << endl;
+    }
+
+    IceUtil::CtrlCHandler ctrlCHandler;
+    ctrlCHandler.setCallback(interruptedCallback);
+
+    for(i = args.begin(); i != args.end(); ++i)
+    {
+        if(depend || dependxml)
+        {
+            PreprocessorPtr icecpp = Preprocessor::create(argv[0], *i, cppArgs);
+            FILE* cppHandle = icecpp->preprocess(false, "-D__SLICE2OBJC__");
+
+            if(cppHandle == 0)
+            {
+                return EXIT_FAILURE;
+            }
+            
+            UnitPtr u = Unit::createUnit(false, false, ice, underscore);
+            int parseStatus = u->parse(*i, cppHandle, debug);
+            u->destroy();
+
+            if(parseStatus == EXIT_FAILURE)
+            {
+                return EXIT_FAILURE;
+            }
+
+            if(!icecpp->printMakefileDependencies(depend ? Preprocessor::ObjC : Preprocessor::JavaXML, 
+                                                  includePaths, "-D__SLICE2OBJC__"))
+            {
+                return EXIT_FAILURE;
+            }
+
+            if(!icecpp->close())
+            {
+                return EXIT_FAILURE;
+            }
+        }
+        else
+        {
+            PreprocessorPtr icecpp = Preprocessor::create(argv[0], *i, cppArgs);
+            FILE* cppHandle = icecpp->preprocess(false, "-D__SLICE2OBJC__");
+
+            if(cppHandle == 0)
+            {
+                return EXIT_FAILURE;
+            }
+
+            if(preprocess)
+            {
+                char buf[4096];
+                while(fgets(buf, static_cast<int>(sizeof(buf)), cppHandle) != NULL)
+                {
+                    if(fputs(buf, stdout) == EOF)
+                    {
+                        return EXIT_FAILURE;
+                    }
+                }
+                if(!icecpp->close())
+                {
+                    return EXIT_FAILURE;
+                }           
+            }
+            else
+            {
+                UnitPtr u = Unit::createUnit(false, false, ice, underscore);
+                int parseStatus = u->parse(*i, cppHandle, debug);
+
+                if(!icecpp->close())
+                {
+                    u->destroy();
+                    return EXIT_FAILURE;
+                }           
+                
+                if(parseStatus == EXIT_FAILURE)
+                {
+                    status = EXIT_FAILURE;
+                }
+                else
+                {
+                    try
+                    {
+                        Gen gen(argv[0], icecpp->getBaseName(), include, includePaths, output);
+                        if(!gen)
+                        {
+                            u->destroy();
+                            return EXIT_FAILURE;
+                        }
+                        gen.generate(u);
+                    }
+                    catch(const Slice::FileException& ex)
+                    {
+                        // If a file could not be created, then
+                        // cleanup any created files.
+                        FileTracker::instance()->cleanup();
+                        u->destroy();
+                        getErrorStream() << argv[0] << ": error: " << ex.reason() << endl;
+                        return EXIT_FAILURE;
+                    }
+                }
+
+                u->destroy();
+            }
+        }
+
+        {
+            IceUtilInternal::MutexPtrLock<IceUtil::Mutex> sync(globalMutex);
+
+            if(interrupted)
+            {
+                FileTracker::instance()->cleanup();
+                return EXIT_FAILURE;
+            }
+        }
+    }
+
+    if(dependxml)
+    {
+        cout << "</dependencies>\n";
+    }
+
+    return status;
+}
diff --git a/cpp/src/slice2objc/Makefile b/cpp/src/slice2objc/Makefile
new file mode 100644
index 00000000000..bd540f310b2
--- /dev/null
+++ b/cpp/src/slice2objc/Makefile
@@ -0,0 +1,31 @@
+# **********************************************************************
+#
+# Copyright (c) 2003-2014 ZeroC, Inc. All rights reserved.
+#
+# This copy of Ice is licensed to you under the terms described in the
+# ICE_LICENSE file included in this distribution.
+#
+# **********************************************************************
+
+top_srcdir	= ../..
+
+NAME		= $(bindir)/slice2objc$(EXE_EXT)
+
+TARGETS		= $(NAME)
+
+OBJS		= Gen.o \
+		  Main.o
+
+RPATH_DIR	= $(LOADER_PATH)/../$(libsubdir)
+
+include $(top_srcdir)/config/Make.rules
+
+CPPFLAGS	:= -I. $(CPPFLAGS)
+
+$(NAME): $(OBJS)
+	rm -f $@
+	$(CXX) $(LDFLAGS) $(LDEXEFLAGS) -o $@ $(OBJS) $(SLICE_LIBS) $(MCPP_RPATH_LINK)
+
+install:: all
+	$(call installprogram,$(NAME),$(DESTDIR)$(install_bindir))
+	$(call installdata,$(top_srcdir)/../man/man1/slice2objc.1,$(DESTDIR)$(install_mandir))