/*
 *
 * Copyright 2008 Alistair Leslie-Hughes
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "mscoree_private.h"

#include <assert.h>
#include <shellapi.h>
#include <initguid.h>

DEFINE_GUID(IID__AppDomain, 0x05f696dc,0x2b29,0x3663,0xad,0x8b,0xc4,0x38,0x9c,0xf2,0xa7,0x13);

struct DomainEntry
{
    struct list entry;
    MonoDomain *domain;
};

static HANDLE dll_fixup_heap; /* using a separate heap so we can have execute permission */

static struct list dll_fixups;

struct dll_fixup
{
    struct list entry;
    int done;
    HMODULE dll;
    void *thunk_code; /* pointer into dll_fixup_heap */
    VTableFixup *fixup;
    void *vtable;
    void *tokens; /* pointer into process heap */
};

static HRESULT RuntimeHost_AddDomain(RuntimeHost *This, MonoDomain **result)
{
    struct DomainEntry *entry;
    char *mscorlib_path;
    HRESULT res=S_OK;

    EnterCriticalSection(&This->lock);

    entry = HeapAlloc(GetProcessHeap(), 0, sizeof(*entry));
    if (!entry)
    {
        res = E_OUTOFMEMORY;
        goto end;
    }

    mscorlib_path = WtoA(This->version->mscorlib_path);
    if (!mscorlib_path)
    {
        HeapFree(GetProcessHeap(), 0, entry);
        res = E_OUTOFMEMORY;
        goto end;
    }

    entry->domain = This->mono->mono_jit_init(mscorlib_path);

    HeapFree(GetProcessHeap(), 0, mscorlib_path);

    if (!entry->domain)
    {
        HeapFree(GetProcessHeap(), 0, entry);
        res = E_FAIL;
        goto end;
    }

    This->mono->is_started = TRUE;

    list_add_tail(&This->domains, &entry->entry);

    *result = entry->domain;

end:
    LeaveCriticalSection(&This->lock);

    return res;
}

static HRESULT RuntimeHost_GetDefaultDomain(RuntimeHost *This, MonoDomain **result)
{
    HRESULT res=S_OK;

    EnterCriticalSection(&This->lock);

    if (This->default_domain) goto end;

    res = RuntimeHost_AddDomain(This, &This->default_domain);

end:
    *result = This->default_domain;

    LeaveCriticalSection(&This->lock);

    return res;
}

static void RuntimeHost_DeleteDomain(RuntimeHost *This, MonoDomain *domain)
{
    struct DomainEntry *entry;

    EnterCriticalSection(&This->lock);

    LIST_FOR_EACH_ENTRY(entry, &This->domains, struct DomainEntry, entry)
    {
        if (entry->domain == domain)
        {
            list_remove(&entry->entry);
            if (This->default_domain == domain)
                This->default_domain = NULL;
            HeapFree(GetProcessHeap(), 0, entry);
            break;
        }
    }

    LeaveCriticalSection(&This->lock);
}

static HRESULT RuntimeHost_GetIUnknownForDomain(RuntimeHost *This, MonoDomain *domain, IUnknown **punk)
{
    HRESULT hr;
    void *args[1];
    MonoAssembly *assembly;
    MonoImage *image;
    MonoClass *klass;
    MonoMethod *method;
    MonoObject *appdomain_object;
    IUnknown *unk;

    This->mono->mono_thread_attach(domain);

    assembly = This->mono->mono_domain_assembly_open(domain, "mscorlib");
    if (!assembly)
    {
        ERR("Cannot load mscorlib\n");
        return E_FAIL;
    }

    image = This->mono->mono_assembly_get_image(assembly);
    if (!image)
    {
        ERR("Couldn't get assembly image\n");
        return E_FAIL;
    }

    klass = This->mono->mono_class_from_name(image, "System", "AppDomain");
    if (!klass)
    {
        ERR("Couldn't get class from image\n");
        return E_FAIL;
    }

    method = This->mono->mono_class_get_method_from_name(klass, "get_CurrentDomain", 0);
    if (!method)
    {
        ERR("Couldn't get method from class\n");
        return E_FAIL;
    }

    args[0] = NULL;
    appdomain_object = This->mono->mono_runtime_invoke(method, NULL, args, NULL);
    if (!appdomain_object)
    {
        ERR("Couldn't get result pointer\n");
        return E_FAIL;
    }

    hr = RuntimeHost_GetIUnknownForObject(This, appdomain_object, &unk);

    if (SUCCEEDED(hr))
    {
        hr = IUnknown_QueryInterface(unk, &IID__AppDomain, (void**)punk);

        IUnknown_Release(unk);
    }

    return hr;
}

static inline RuntimeHost *impl_from_ICLRRuntimeHost( ICLRRuntimeHost *iface )
{
    return CONTAINING_RECORD(iface, RuntimeHost, ICLRRuntimeHost_iface);
}

static inline RuntimeHost *impl_from_ICorRuntimeHost( ICorRuntimeHost *iface )
{
    return CONTAINING_RECORD(iface, RuntimeHost, ICorRuntimeHost_iface);
}

/*** IUnknown methods ***/
static HRESULT WINAPI corruntimehost_QueryInterface(ICorRuntimeHost* iface,
        REFIID riid,
        void **ppvObject)
{
    RuntimeHost *This = impl_from_ICorRuntimeHost( iface );
    TRACE("%p %s %p\n", This, debugstr_guid(riid), ppvObject);

    if ( IsEqualGUID( riid, &IID_ICorRuntimeHost ) ||
         IsEqualGUID( riid, &IID_IUnknown ) )
    {
        *ppvObject = iface;
    }
    else
    {
        FIXME("Unsupported interface %s\n", debugstr_guid(riid));
        return E_NOINTERFACE;
    }

    ICorRuntimeHost_AddRef( iface );

    return S_OK;
}

static ULONG WINAPI corruntimehost_AddRef(ICorRuntimeHost* iface)
{
    RuntimeHost *This = impl_from_ICorRuntimeHost( iface );

    return InterlockedIncrement( &This->ref );
}

static ULONG WINAPI corruntimehost_Release(ICorRuntimeHost* iface)
{
    RuntimeHost *This = impl_from_ICorRuntimeHost( iface );
    ULONG ref;

    ref = InterlockedDecrement( &This->ref );

    return ref;
}

/*** ICorRuntimeHost methods ***/
static HRESULT WINAPI corruntimehost_CreateLogicalThreadState(
                    ICorRuntimeHost* iface)
{
    FIXME("stub %p\n", iface);
    return E_NOTIMPL;
}

static HRESULT WINAPI corruntimehost_DeleteLogicalThreadState(
                    ICorRuntimeHost* iface)
{
    FIXME("stub %p\n", iface);
    return E_NOTIMPL;
}

static HRESULT WINAPI corruntimehost_SwitchInLogicalThreadState(
                    ICorRuntimeHost* iface,
                    DWORD *fiberCookie)
{
    FIXME("stub %p\n", iface);
    return E_NOTIMPL;
}

static HRESULT WINAPI corruntimehost_SwitchOutLogicalThreadState(
                    ICorRuntimeHost* iface,
                    DWORD **fiberCookie)
{
    FIXME("stub %p\n", iface);
    return E_NOTIMPL;
}

static HRESULT WINAPI corruntimehost_LocksHeldByLogicalThread(
                    ICorRuntimeHost* iface,
                    DWORD *pCount)
{
    FIXME("stub %p\n", iface);
    return E_NOTIMPL;
}

static HRESULT WINAPI corruntimehost_MapFile(
    ICorRuntimeHost* iface,
    HANDLE hFile,
    HMODULE *mapAddress)
{
    FIXME("stub %p\n", iface);
    return E_NOTIMPL;
}

static HRESULT WINAPI corruntimehost_GetConfiguration(
    ICorRuntimeHost* iface,
    ICorConfiguration **pConfiguration)
{
    FIXME("stub %p\n", iface);
    return E_NOTIMPL;
}

static HRESULT WINAPI corruntimehost_Start(
    ICorRuntimeHost* iface)
{
    FIXME("stub %p\n", iface);
    return S_OK;
}

static HRESULT WINAPI corruntimehost_Stop(
    ICorRuntimeHost* iface)
{
    FIXME("stub %p\n", iface);
    return E_NOTIMPL;
}

static HRESULT WINAPI corruntimehost_CreateDomain(
    ICorRuntimeHost* iface,
    LPCWSTR friendlyName,
    IUnknown *identityArray,
    IUnknown **appDomain)
{
    FIXME("stub %p\n", iface);
    return E_NOTIMPL;
}

static HRESULT WINAPI corruntimehost_GetDefaultDomain(
    ICorRuntimeHost* iface,
    IUnknown **pAppDomain)
{
    RuntimeHost *This = impl_from_ICorRuntimeHost( iface );
    HRESULT hr;
    MonoDomain *domain;

    TRACE("(%p)\n", iface);

    hr = RuntimeHost_GetDefaultDomain(This, &domain);

    if (SUCCEEDED(hr))
    {
        hr = RuntimeHost_GetIUnknownForDomain(This, domain, pAppDomain);
    }

    return hr;
}

static HRESULT WINAPI corruntimehost_EnumDomains(
    ICorRuntimeHost* iface,
    HDOMAINENUM *hEnum)
{
    FIXME("stub %p\n", iface);
    return E_NOTIMPL;
}

static HRESULT WINAPI corruntimehost_NextDomain(
    ICorRuntimeHost* iface,
    HDOMAINENUM hEnum,
    IUnknown **appDomain)
{
    FIXME("stub %p\n", iface);
    return E_NOTIMPL;
}

static HRESULT WINAPI corruntimehost_CloseEnum(
    ICorRuntimeHost* iface,
    HDOMAINENUM hEnum)
{
    FIXME("stub %p\n", iface);
    return E_NOTIMPL;
}

static HRESULT WINAPI corruntimehost_CreateDomainEx(
    ICorRuntimeHost* iface,
    LPCWSTR friendlyName,
    IUnknown *setup,
    IUnknown *evidence,
    IUnknown **appDomain)
{
    FIXME("stub %p\n", iface);
    return E_NOTIMPL;
}

static HRESULT WINAPI corruntimehost_CreateDomainSetup(
    ICorRuntimeHost* iface,
    IUnknown **appDomainSetup)
{
    FIXME("stub %p\n", iface);
    return E_NOTIMPL;
}

static HRESULT WINAPI corruntimehost_CreateEvidence(
    ICorRuntimeHost* iface,
    IUnknown **evidence)
{
    FIXME("stub %p\n", iface);
    return E_NOTIMPL;
}

static HRESULT WINAPI corruntimehost_UnloadDomain(
    ICorRuntimeHost* iface,
    IUnknown *appDomain)
{
    FIXME("stub %p\n", iface);
    return E_NOTIMPL;
}

static HRESULT WINAPI corruntimehost_CurrentDomain(
    ICorRuntimeHost* iface,
    IUnknown **appDomain)
{
    FIXME("stub %p\n", iface);
    return E_NOTIMPL;
}

static const struct ICorRuntimeHostVtbl corruntimehost_vtbl =
{
    corruntimehost_QueryInterface,
    corruntimehost_AddRef,
    corruntimehost_Release,
    corruntimehost_CreateLogicalThreadState,
    corruntimehost_DeleteLogicalThreadState,
    corruntimehost_SwitchInLogicalThreadState,
    corruntimehost_SwitchOutLogicalThreadState,
    corruntimehost_LocksHeldByLogicalThread,
    corruntimehost_MapFile,
    corruntimehost_GetConfiguration,
    corruntimehost_Start,
    corruntimehost_Stop,
    corruntimehost_CreateDomain,
    corruntimehost_GetDefaultDomain,
    corruntimehost_EnumDomains,
    corruntimehost_NextDomain,
    corruntimehost_CloseEnum,
    corruntimehost_CreateDomainEx,
    corruntimehost_CreateDomainSetup,
    corruntimehost_CreateEvidence,
    corruntimehost_UnloadDomain,
    corruntimehost_CurrentDomain
};

static HRESULT WINAPI CLRRuntimeHost_QueryInterface(ICLRRuntimeHost* iface,
        REFIID riid,
        void **ppvObject)
{
    RuntimeHost *This = impl_from_ICLRRuntimeHost( iface );
    TRACE("%p %s %p\n", This, debugstr_guid(riid), ppvObject);

    if ( IsEqualGUID( riid, &IID_ICLRRuntimeHost ) ||
         IsEqualGUID( riid, &IID_IUnknown ) )
    {
        *ppvObject = iface;
    }
    else
    {
        FIXME("Unsupported interface %s\n", debugstr_guid(riid));
        return E_NOINTERFACE;
    }

    ICLRRuntimeHost_AddRef( iface );

    return S_OK;
}

static ULONG WINAPI CLRRuntimeHost_AddRef(ICLRRuntimeHost* iface)
{
    RuntimeHost *This = impl_from_ICLRRuntimeHost( iface );
    return ICorRuntimeHost_AddRef(&This->ICorRuntimeHost_iface);
}

static ULONG WINAPI CLRRuntimeHost_Release(ICLRRuntimeHost* iface)
{
    RuntimeHost *This = impl_from_ICLRRuntimeHost( iface );
    return ICorRuntimeHost_Release(&This->ICorRuntimeHost_iface);
}

static HRESULT WINAPI CLRRuntimeHost_Start(ICLRRuntimeHost* iface)
{
    FIXME("(%p)\n", iface);
    return E_NOTIMPL;
}

static HRESULT WINAPI CLRRuntimeHost_Stop(ICLRRuntimeHost* iface)
{
    FIXME("(%p)\n", iface);
    return E_NOTIMPL;
}

static HRESULT WINAPI CLRRuntimeHost_SetHostControl(ICLRRuntimeHost* iface,
    IHostControl *pHostControl)
{
    FIXME("(%p,%p)\n", iface, pHostControl);
    return E_NOTIMPL;
}

static HRESULT WINAPI CLRRuntimeHost_GetCLRControl(ICLRRuntimeHost* iface,
    ICLRControl **pCLRControl)
{
    FIXME("(%p,%p)\n", iface, pCLRControl);
    return E_NOTIMPL;
}

static HRESULT WINAPI CLRRuntimeHost_UnloadAppDomain(ICLRRuntimeHost* iface,
    DWORD dwAppDomainId, BOOL fWaitUntilDone)
{
    FIXME("(%p,%u,%i)\n", iface, dwAppDomainId, fWaitUntilDone);
    return E_NOTIMPL;
}

static HRESULT WINAPI CLRRuntimeHost_ExecuteInAppDomain(ICLRRuntimeHost* iface,
    DWORD dwAppDomainId, FExecuteInAppDomainCallback pCallback, void *cookie)
{
    FIXME("(%p,%u,%p,%p)\n", iface, dwAppDomainId, pCallback, cookie);
    return E_NOTIMPL;
}

static HRESULT WINAPI CLRRuntimeHost_GetCurrentAppDomainId(ICLRRuntimeHost* iface,
    DWORD *pdwAppDomainId)
{
    FIXME("(%p,%p)\n", iface, pdwAppDomainId);
    return E_NOTIMPL;
}

static HRESULT WINAPI CLRRuntimeHost_ExecuteApplication(ICLRRuntimeHost* iface,
    LPCWSTR pwzAppFullName, DWORD dwManifestPaths, LPCWSTR *ppwzManifestPaths,
    DWORD dwActivationData, LPCWSTR *ppwzActivationData, int *pReturnValue)
{
    FIXME("(%p,%s,%u,%u)\n", iface, debugstr_w(pwzAppFullName), dwManifestPaths, dwActivationData);
    return E_NOTIMPL;
}

static HRESULT WINAPI CLRRuntimeHost_ExecuteInDefaultAppDomain(ICLRRuntimeHost* iface,
    LPCWSTR pwzAssemblyPath, LPCWSTR pwzTypeName, LPCWSTR pwzMethodName,
    LPCWSTR pwzArgument, DWORD *pReturnValue)
{
    RuntimeHost *This = impl_from_ICLRRuntimeHost( iface );
    HRESULT hr;
    MonoDomain *domain;
    MonoAssembly *assembly;
    MonoImage *image;
    MonoClass *klass;
    MonoMethod *method;
    MonoObject *result;
    MonoString *str;
    void *args[2];
    char *filenameA = NULL, *classA = NULL, *methodA = NULL;
    char *argsA = NULL, *ns;

    TRACE("(%p,%s,%s,%s,%s)\n", iface, debugstr_w(pwzAssemblyPath),
        debugstr_w(pwzTypeName), debugstr_w(pwzMethodName), debugstr_w(pwzArgument));

    hr = RuntimeHost_GetDefaultDomain(This, &domain);
    if(hr != S_OK)
    {
        ERR("Couldn't get Default Domain\n");
        return hr;
    }

    hr = E_FAIL;

    This->mono->mono_thread_attach(domain);

    filenameA = WtoA(pwzAssemblyPath);
    assembly = This->mono->mono_domain_assembly_open(domain, filenameA);
    if (!assembly)
    {
        ERR("Cannot open assembly %s\n", filenameA);
        goto cleanup;
    }

    image = This->mono->mono_assembly_get_image(assembly);
    if (!image)
    {
        ERR("Couldn't get assembly image\n");
        goto cleanup;
    }

    classA = WtoA(pwzTypeName);
    ns = strrchr(classA, '.');
    *ns = '\0';
    klass = This->mono->mono_class_from_name(image, classA, ns+1);
    if (!klass)
    {
        ERR("Couldn't get class from image\n");
        goto cleanup;
    }

    methodA = WtoA(pwzMethodName);
    method = This->mono->mono_class_get_method_from_name(klass, methodA, 1);
    if (!method)
    {
        ERR("Couldn't get method from class\n");
        goto cleanup;
    }

    /* The .NET function we are calling has the following declaration
     *   public static int functionName(String param)
     */
    argsA = WtoA(pwzArgument);
    str = This->mono->mono_string_new(domain, argsA);
    args[0] = str;
    args[1] = NULL;
    result = This->mono->mono_runtime_invoke(method, NULL, args, NULL);
    if (!result)
        ERR("Couldn't get result pointer\n");
    else
    {
        *pReturnValue = *(DWORD*)This->mono->mono_object_unbox(result);
        hr = S_OK;
    }

cleanup:
    HeapFree(GetProcessHeap(), 0, filenameA);
    HeapFree(GetProcessHeap(), 0, classA);
    HeapFree(GetProcessHeap(), 0, argsA);
    HeapFree(GetProcessHeap(), 0, methodA);

    return hr;
}

static const struct ICLRRuntimeHostVtbl CLRHostVtbl =
{
    CLRRuntimeHost_QueryInterface,
    CLRRuntimeHost_AddRef,
    CLRRuntimeHost_Release,
    CLRRuntimeHost_Start,
    CLRRuntimeHost_Stop,
    CLRRuntimeHost_SetHostControl,
    CLRRuntimeHost_GetCLRControl,
    CLRRuntimeHost_UnloadAppDomain,
    CLRRuntimeHost_ExecuteInAppDomain,
    CLRRuntimeHost_GetCurrentAppDomainId,
    CLRRuntimeHost_ExecuteApplication,
    CLRRuntimeHost_ExecuteInDefaultAppDomain
};

/* Create an instance of a type given its name, by calling its constructor with
 * no arguments. Note that result MUST be in the stack, or the garbage
 * collector may free it prematurely. */
HRESULT RuntimeHost_CreateManagedInstance(RuntimeHost *This, LPCWSTR name,
    MonoDomain *domain, MonoObject **result)
{
    HRESULT hr=S_OK;
    char *nameA=NULL;
    MonoType *type;
    MonoClass *klass;
    MonoObject *obj;

    if (!domain)
        hr = RuntimeHost_GetDefaultDomain(This, &domain);

    if (SUCCEEDED(hr))
    {
        nameA = WtoA(name);
        if (!nameA)
            hr = E_OUTOFMEMORY;
    }

    if (SUCCEEDED(hr))
    {
        This->mono->mono_thread_attach(domain);

        type = This->mono->mono_reflection_type_from_name(nameA, NULL);
        if (!type)
        {
            ERR("Cannot find type %s\n", debugstr_w(name));
            hr = E_FAIL;
        }
    }

    if (SUCCEEDED(hr))
    {
        klass = This->mono->mono_class_from_mono_type(type);
        if (!klass)
        {
            ERR("Cannot convert type %s to a class\n", debugstr_w(name));
            hr = E_FAIL;
        }
    }

    if (SUCCEEDED(hr))
    {
        obj = This->mono->mono_object_new(domain, klass);
        if (!obj)
        {
            ERR("Cannot allocate object of type %s\n", debugstr_w(name));
            hr = E_FAIL;
        }
    }

    if (SUCCEEDED(hr))
    {
        /* FIXME: Detect exceptions from the constructor? */
        This->mono->mono_runtime_object_init(obj);
        *result = obj;
    }

    HeapFree(GetProcessHeap(), 0, nameA);

    return hr;
}

/* Get an IUnknown pointer for a Mono object.
 *
 * This is just a "light" wrapper around
 * System.Runtime.InteropServices.Marshal:GetIUnknownForObject
 *
 * NOTE: The IUnknown* is created with a reference to the object.
 * Until they have a reference, objects must be in the stack to prevent the
 * garbage collector from freeing them.
 *
 * mono_thread_attach must have already been called for this thread. */
HRESULT RuntimeHost_GetIUnknownForObject(RuntimeHost *This, MonoObject *obj,
    IUnknown **ppUnk)
{
    MonoDomain *domain;
    MonoAssembly *assembly;
    MonoImage *image;
    MonoClass *klass;
    MonoMethod *method;
    MonoObject *result;
    void *args[2];

    domain = This->mono->mono_object_get_domain(obj);

    assembly = This->mono->mono_domain_assembly_open(domain, "mscorlib");
    if (!assembly)
    {
        ERR("Cannot load mscorlib\n");
        return E_FAIL;
    }

    image = This->mono->mono_assembly_get_image(assembly);
    if (!image)
    {
        ERR("Couldn't get assembly image\n");
        return E_FAIL;
    }

    klass = This->mono->mono_class_from_name(image, "System.Runtime.InteropServices", "Marshal");
    if (!klass)
    {
        ERR("Couldn't get class from image\n");
        return E_FAIL;
    }

    method = This->mono->mono_class_get_method_from_name(klass, "GetIUnknownForObject", 1);
    if (!method)
    {
        ERR("Couldn't get method from class\n");
        return E_FAIL;
    }

    args[0] = obj;
    args[1] = NULL;
    result = This->mono->mono_runtime_invoke(method, NULL, args, NULL);
    if (!result)
    {
        ERR("Couldn't get result pointer\n");
        return E_FAIL;
    }

    *ppUnk = *(IUnknown**)This->mono->mono_object_unbox(result);
    if (!*ppUnk)
    {
        ERR("GetIUnknownForObject returned 0\n");
        return E_FAIL;
    }

    return S_OK;
}

static void get_utf8_args(int *argc, char ***argv)
{
    WCHAR **argvw;
    int size=0, i;
    char *current_arg;

    argvw = CommandLineToArgvW(GetCommandLineW(), argc);

    for (i=0; i<*argc; i++)
    {
        size += sizeof(char*);
        size += WideCharToMultiByte(CP_UTF8, 0, argvw[i], -1, NULL, 0, NULL, NULL);
    }
    size += sizeof(char*);

    *argv = HeapAlloc(GetProcessHeap(), 0, size);
    current_arg = (char*)(*argv + *argc + 1);

    for (i=0; i<*argc; i++)
    {
        (*argv)[i] = current_arg;
        current_arg += WideCharToMultiByte(CP_UTF8, 0, argvw[i], -1, current_arg, size, NULL, NULL);
    }

    (*argv)[*argc] = NULL;

    HeapFree(GetProcessHeap(), 0, argvw);
}

#if __i386__

# define CAN_FIXUP_VTABLE 1

#include "pshpack1.h"

struct vtable_fixup_thunk
{
    /* sub $0x4,%esp */
    BYTE i1[3];
    /* mov fixup,(%esp) */
    BYTE i2[3];
    struct dll_fixup *fixup;
    /* mov function,%eax */
    BYTE i3;
    void (CDECL *function)(struct dll_fixup *);
    /* call *%eax */
    BYTE i4[2];
    /* pop %eax */
    BYTE i5;
    /* jmp *vtable_entry */
    BYTE i6[2];
    void *vtable_entry;
};

static const struct vtable_fixup_thunk thunk_template = {
    {0x83,0xec,0x04},
    {0xc7,0x04,0x24},
    NULL,
    0xb8,
    NULL,
    {0xff,0xd0},
    0x58,
    {0xff,0x25},
    NULL
};

#include "poppack.h"

#else /* !defined(__i386__) */

# define CAN_FIXUP_VTABLE 0

struct vtable_fixup_thunk
{
    struct dll_fixup *fixup;
    void (CDECL *function)(struct dll_fixup *fixup);
    void *vtable_entry;
};

static const struct vtable_fixup_thunk thunk_template = {0};

#endif

static void CDECL ReallyFixupVTable(struct dll_fixup *fixup)
{
    HRESULT hr=S_OK;
    WCHAR filename[MAX_PATH];
    ICLRRuntimeInfo *info=NULL;
    RuntimeHost *host;
    char *filenameA;
    MonoImage *image=NULL;
    MonoAssembly *assembly=NULL;
    MonoImageOpenStatus status=0;
    MonoDomain *domain;

    if (fixup->done) return;

    /* It's possible we'll have two threads doing this at once. This is
     * considered preferable to the potential deadlock if we use a mutex. */

    GetModuleFileNameW(fixup->dll, filename, MAX_PATH);

    TRACE("%p,%p,%s\n", fixup, fixup->dll, debugstr_w(filename));

    filenameA = WtoA(filename);
    if (!filenameA)
        hr = E_OUTOFMEMORY;

    if (SUCCEEDED(hr))
        hr = get_runtime_info(filename, NULL, NULL, 0, 0, FALSE, &info);

    if (SUCCEEDED(hr))
        hr = ICLRRuntimeInfo_GetRuntimeHost(info, &host);

    if (SUCCEEDED(hr))
        hr = RuntimeHost_GetDefaultDomain(host, &domain);

    if (SUCCEEDED(hr))
    {
        host->mono->mono_thread_attach(domain);

        image = host->mono->mono_image_open_from_module_handle(fixup->dll,
            filenameA, 1, &status);
    }

    if (image)
        assembly = host->mono->mono_assembly_load_from(image, filenameA, &status);

    if (assembly)
    {
        int i;

        /* Mono needs an image that belongs to an assembly. */
        image = host->mono->mono_assembly_get_image(assembly);

        if (fixup->fixup->type & COR_VTABLE_32BIT)
        {
            DWORD *vtable = fixup->vtable;
            DWORD *tokens = fixup->tokens;
            for (i=0; i<fixup->fixup->count; i++)
            {
                TRACE("%x\n", tokens[i]);
                vtable[i] = PtrToUint(host->mono->mono_marshal_get_vtfixup_ftnptr(
                    image, tokens[i], fixup->fixup->type));
            }
        }

        fixup->done = 1;
    }

    if (info != NULL)
        ICLRRuntimeInfo_Release(info);

    HeapFree(GetProcessHeap(), 0, filenameA);

    if (!fixup->done)
    {
        ERR("unable to fixup vtable, hr=%x, status=%d\n", hr, status);
        /* If we returned now, we'd get an infinite loop. */
        assert(0);
    }
}

static void FixupVTableEntry(HMODULE hmodule, VTableFixup *vtable_fixup)
{
    /* We can't actually generate code for the functions without loading mono,
     * and loading mono inside DllMain is a terrible idea. So we make thunks
     * that call ReallyFixupVTable, which will load the runtime and fill in the
     * vtable, then do an indirect jump using the (now filled in) vtable. Note
     * that we have to keep the thunks around forever, as one of them may get
     * called while we're filling in the table, and we can never be sure all
     * threads are clear. */
    struct dll_fixup *fixup;

    fixup = HeapAlloc(GetProcessHeap(), 0, sizeof(*fixup));

    fixup->dll = hmodule;
    fixup->thunk_code = HeapAlloc(dll_fixup_heap, 0, sizeof(struct vtable_fixup_thunk) * vtable_fixup->count);
    fixup->fixup = vtable_fixup;
    fixup->vtable = (BYTE*)hmodule + vtable_fixup->rva;
    fixup->done = 0;

    if (vtable_fixup->type & COR_VTABLE_32BIT)
    {
        DWORD *vtable = fixup->vtable;
        DWORD *tokens;
        int i;
        struct vtable_fixup_thunk *thunks = fixup->thunk_code;

        if (sizeof(void*) > 4)
            ERR("32-bit fixup in 64-bit mode; broken image?\n");

        tokens = fixup->tokens = HeapAlloc(GetProcessHeap(), 0, sizeof(*tokens) * vtable_fixup->count);
        memcpy(tokens, vtable, sizeof(*tokens) * vtable_fixup->count);
        for (i=0; i<vtable_fixup->count; i++)
        {
            memcpy(&thunks[i], &thunk_template, sizeof(thunk_template));
            thunks[i].fixup = fixup;
            thunks[i].function = ReallyFixupVTable;
            thunks[i].vtable_entry = &vtable[i];
            vtable[i] = PtrToUint(&thunks[i]);
        }
    }
    else
    {
        ERR("unsupported vtable fixup flags %x\n", vtable_fixup->type);
        HeapFree(dll_fixup_heap, 0, fixup->thunk_code);
        HeapFree(GetProcessHeap(), 0, fixup);
        return;
    }

    list_add_tail(&dll_fixups, &fixup->entry);
}

static void FixupVTable(HMODULE hmodule)
{
    ASSEMBLY *assembly;
    HRESULT hr;
    VTableFixup *vtable_fixups;
    ULONG vtable_fixup_count, i;

    hr = assembly_from_hmodule(&assembly, hmodule);
    if (SUCCEEDED(hr))
    {
        hr = assembly_get_vtable_fixups(assembly, &vtable_fixups, &vtable_fixup_count);
        if (CAN_FIXUP_VTABLE)
            for (i=0; i<vtable_fixup_count; i++)
                FixupVTableEntry(hmodule, &vtable_fixups[i]);
        else if (vtable_fixup_count)
            FIXME("cannot fixup vtable; expect a crash\n");

        assembly_release(assembly);
    }
    else
        ERR("failed to read CLR headers, hr=%x\n", hr);
}

__int32 WINAPI _CorExeMain(void)
{
    int exit_code;
    int argc;
    char **argv;
    MonoDomain *domain;
    MonoImage *image;
    MonoImageOpenStatus status;
    MonoAssembly *assembly=NULL;
    WCHAR filename[MAX_PATH];
    char *filenameA;
    ICLRRuntimeInfo *info;
    RuntimeHost *host;
    HRESULT hr;
    int i;

    get_utf8_args(&argc, &argv);

    GetModuleFileNameW(NULL, filename, MAX_PATH);

    TRACE("%s", debugstr_w(filename));
    for (i=0; i<argc; i++)
        TRACE(" %s", debugstr_a(argv[i]));
    TRACE("\n");

    filenameA = WtoA(filename);
    if (!filenameA)
        return -1;

    FixupVTable(GetModuleHandleW(NULL));

    hr = get_runtime_info(filename, NULL, NULL, 0, 0, FALSE, &info);

    if (SUCCEEDED(hr))
    {
        hr = ICLRRuntimeInfo_GetRuntimeHost(info, &host);

        if (SUCCEEDED(hr))
            hr = RuntimeHost_GetDefaultDomain(host, &domain);

        if (SUCCEEDED(hr))
        {
            image = host->mono->mono_image_open_from_module_handle(GetModuleHandleW(NULL),
                filenameA, 1, &status);

            if (image)
                assembly = host->mono->mono_assembly_load_from(image, filenameA, &status);

            if (assembly)
            {
                exit_code = host->mono->mono_jit_exec(domain, assembly, argc, argv);
            }
            else
            {
                ERR("couldn't load %s, status=%d\n", debugstr_w(filename), status);
                exit_code = -1;
            }

            RuntimeHost_DeleteDomain(host, domain);
        }
        else
            exit_code = -1;

        ICLRRuntimeInfo_Release(info);
    }
    else
        exit_code = -1;

    HeapFree(GetProcessHeap(), 0, argv);

    unload_all_runtimes();

    return exit_code;
}

BOOL WINAPI _CorDllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
{
    TRACE("(%p, %d, %p)\n", hinstDLL, fdwReason, lpvReserved);

    switch (fdwReason)
    {
    case DLL_PROCESS_ATTACH:
        DisableThreadLibraryCalls(hinstDLL);
        FixupVTable(hinstDLL);
        break;
    case DLL_PROCESS_DETACH:
        /* FIXME: clean up the vtables */
        break;
    }
    return TRUE;
}

/* called from DLL_PROCESS_ATTACH */
void runtimehost_init(void)
{
    dll_fixup_heap = HeapCreate(HEAP_CREATE_ENABLE_EXECUTE, 0, 0);
    list_init(&dll_fixups);
}

/* called from DLL_PROCESS_DETACH */
void runtimehost_uninit(void)
{
    struct dll_fixup *fixup, *fixup2;

    HeapDestroy(dll_fixup_heap);
    LIST_FOR_EACH_ENTRY_SAFE(fixup, fixup2, &dll_fixups, struct dll_fixup, entry)
    {
        HeapFree(GetProcessHeap(), 0, fixup->tokens);
        HeapFree(GetProcessHeap(), 0, fixup);
    }
}

HRESULT RuntimeHost_Construct(const CLRRuntimeInfo *runtime_version,
    loaded_mono *loaded_mono, RuntimeHost** result)
{
    RuntimeHost *This;

    This = HeapAlloc( GetProcessHeap(), 0, sizeof *This );
    if ( !This )
        return E_OUTOFMEMORY;

    This->ICorRuntimeHost_iface.lpVtbl = &corruntimehost_vtbl;
    This->ICLRRuntimeHost_iface.lpVtbl = &CLRHostVtbl;

    This->ref = 1;
    This->version = runtime_version;
    This->mono = loaded_mono;
    list_init(&This->domains);
    This->default_domain = NULL;
    InitializeCriticalSection(&This->lock);
    This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": RuntimeHost.lock");

    *result = This;

    return S_OK;
}

HRESULT RuntimeHost_GetInterface(RuntimeHost *This, REFCLSID clsid, REFIID riid, void **ppv)
{
    IUnknown *unk;
    HRESULT hr;

    if (IsEqualGUID(clsid, &CLSID_CorRuntimeHost))
    {
        unk = (IUnknown*)&This->ICorRuntimeHost_iface;
        IUnknown_AddRef(unk);
    }
    else if (IsEqualGUID(clsid, &CLSID_CLRRuntimeHost))
    {
        unk = (IUnknown*)&This->ICLRRuntimeHost_iface;
        IUnknown_AddRef(unk);
    }
    else if (IsEqualGUID(clsid, &CLSID_CorMetaDataDispenser) ||
             IsEqualGUID(clsid, &CLSID_CorMetaDataDispenserRuntime))
    {
        hr = MetaDataDispenser_CreateInstance(&unk);
        if (FAILED(hr))
            return hr;
    }
    else if (IsEqualGUID(clsid, &CLSID_CLRDebuggingLegacy))
    {
        hr = CorDebug_Create(&This->ICLRRuntimeHost_iface, &unk);
        if (FAILED(hr))
            return hr;
    }
    else
        unk = NULL;

    if (unk)
    {
        hr = IUnknown_QueryInterface(unk, riid, ppv);

        IUnknown_Release(unk);

        return hr;
    }
    else
        FIXME("not implemented for class %s\n", debugstr_guid(clsid));

    return CLASS_E_CLASSNOTAVAILABLE;
}

HRESULT RuntimeHost_Destroy(RuntimeHost *This)
{
    struct DomainEntry *cursor, *cursor2;

    This->lock.DebugInfo->Spare[0] = 0;
    DeleteCriticalSection(&This->lock);

    LIST_FOR_EACH_ENTRY_SAFE(cursor, cursor2, &This->domains, struct DomainEntry, entry)
    {
        list_remove(&cursor->entry);
        HeapFree(GetProcessHeap(), 0, cursor);
    }

    HeapFree( GetProcessHeap(), 0, This );
    return S_OK;
}

#define CHARS_IN_GUID 39
#undef ARRAYSIZE
#define ARRAYSIZE(array) (sizeof(array)/sizeof((array)[0]))

HRESULT create_monodata(REFIID riid, LPVOID *ppObj )
{
    static const WCHAR wszCodebase[] = {'C','o','d','e','B','a','s','e',0};
    static const WCHAR wszClass[] = {'C','l','a','s','s',0};
    static const WCHAR wszFileSlash[] = {'f','i','l','e',':','/','/','/',0};
    static const WCHAR wszCLSIDSlash[] = {'C','L','S','I','D','\\',0};
    static const WCHAR wszInprocServer32[] = {'\\','I','n','p','r','o','c','S','e','r','v','e','r','3','2',0};
    WCHAR path[CHARS_IN_GUID + ARRAYSIZE(wszCLSIDSlash) + ARRAYSIZE(wszInprocServer32) - 1];
    MonoDomain *domain;
    MonoAssembly *assembly;
    ICLRRuntimeInfo *info = NULL;
    RuntimeHost *host;
    HRESULT hr;
    HKEY key;
    LONG res;
    int offset = 0;
    WCHAR codebase[MAX_PATH + 8];
    WCHAR classname[350];
    WCHAR filename[MAX_PATH];

    DWORD dwBufLen = 350;

    lstrcpyW(path, wszCLSIDSlash);
    StringFromGUID2(riid, path + lstrlenW(wszCLSIDSlash), CHARS_IN_GUID);
    lstrcatW(path, wszInprocServer32);

    TRACE("Registry key: %s\n", debugstr_w(path));

    res = RegOpenKeyExW(HKEY_CLASSES_ROOT, path, 0, KEY_READ, &key);
    if (res == ERROR_FILE_NOT_FOUND)
        return CLASS_E_CLASSNOTAVAILABLE;

    res = RegGetValueW( key, NULL, wszClass, RRF_RT_REG_SZ, NULL, classname, &dwBufLen);
    if(res != ERROR_SUCCESS)
    {
        WARN("Class value cannot be found.\n");
        hr = CLASS_E_CLASSNOTAVAILABLE;
        goto cleanup;
    }

    TRACE("classname (%s)\n", debugstr_w(classname));

    dwBufLen = MAX_PATH + 8;
    res = RegGetValueW( key, NULL, wszCodebase, RRF_RT_REG_SZ, NULL, codebase, &dwBufLen);
    if(res != ERROR_SUCCESS)
    {
        WARN("CodeBase value cannot be found.\n");
        hr = CLASS_E_CLASSNOTAVAILABLE;
        goto cleanup;
    }

    /* Strip file:/// */
    if(strncmpW(codebase, wszFileSlash, strlenW(wszFileSlash)) == 0)
        offset = strlenW(wszFileSlash);

    strcpyW(filename, codebase + offset);

    TRACE("codebase (%s)\n", debugstr_w(filename));

    *ppObj = NULL;


    hr = get_runtime_info(filename, NULL, NULL, 0, 0, FALSE, &info);
    if (SUCCEEDED(hr))
    {
        hr = ICLRRuntimeInfo_GetRuntimeHost(info, &host);

        if (SUCCEEDED(hr))
            hr = RuntimeHost_GetDefaultDomain(host, &domain);

        if (SUCCEEDED(hr))
        {
            MonoImage *image;
            MonoClass *klass;
            MonoObject *result;
            IUnknown *unk = NULL;
            char *filenameA, *ns;
            char *classA;

            hr = CLASS_E_CLASSNOTAVAILABLE;

            host->mono->mono_thread_attach(domain);

            filenameA = WtoA(filename);
            assembly = host->mono->mono_domain_assembly_open(domain, filenameA);
            HeapFree(GetProcessHeap(), 0, filenameA);
            if (!assembly)
            {
                ERR("Cannot open assembly %s\n", filenameA);
                goto cleanup;
            }

            image = host->mono->mono_assembly_get_image(assembly);
            if (!image)
            {
                ERR("Couldn't get assembly image\n");
                goto cleanup;
            }

            classA = WtoA(classname);
            ns = strrchr(classA, '.');
            *ns = '\0';

            klass = host->mono->mono_class_from_name(image, classA, ns+1);
            HeapFree(GetProcessHeap(), 0, classA);
            if (!klass)
            {
                ERR("Couldn't get class from image\n");
                goto cleanup;
            }

            /*
             * Use the default constructor for the .NET class.
             */
            result = host->mono->mono_object_new(domain, klass);
            host->mono->mono_runtime_object_init(result);

            hr = RuntimeHost_GetIUnknownForObject(host, result, &unk);
            if (SUCCEEDED(hr))
            {
                hr = IUnknown_QueryInterface(unk, &IID_IUnknown, ppObj);

                IUnknown_Release(unk);
            }
            else
                hr = CLASS_E_CLASSNOTAVAILABLE;
        }
        else
            hr = CLASS_E_CLASSNOTAVAILABLE;
    }
    else
        hr = CLASS_E_CLASSNOTAVAILABLE;

cleanup:
    if(info)
        ICLRRuntimeInfo_Release(info);

    RegCloseKey(key);

    return hr;
}