dlls/jscript/dispex.c

/*
 * Copyright 2008 Jacek Caban for CodeWeavers
 *
 * 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 <assert.h>

#include "jscript.h"
#include "engine.h"

#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(jscript);

static const GUID GUID_JScriptTypeInfo = {0xc59c6b12,0xf6c1,0x11cf,{0x88,0x35,0x00,0xa0,0xc9,0x11,0xe8,0xb2}};

#define FDEX_VERSION_MASK 0xf0000000
#define GOLDEN_RATIO 0x9E3779B9U

typedef enum {
    PROP_JSVAL,
    PROP_BUILTIN,
    PROP_PROTREF,
    PROP_ACCESSOR,
    PROP_DELETED,
    PROP_EXTERN
} prop_type_t;

struct _dispex_prop_t {
    WCHAR *name;
    unsigned hash;
    prop_type_t type;
    DWORD flags;

    union {
        jsval_t val;
        const builtin_prop_t *p;
        DWORD ref;
        unsigned id;
        struct {
            jsdisp_t *getter;
            jsdisp_t *setter;
        } accessor;
    } u;

    int bucket_head;
    int bucket_next;
};

static void fix_protref_prop(jsdisp_t *jsdisp, dispex_prop_t *prop)
{
    DWORD ref;

    if(prop->type != PROP_PROTREF)
        return;
    ref = prop->u.ref;

    while((jsdisp = jsdisp->prototype)) {
        if(ref >= jsdisp->prop_cnt || jsdisp->props[ref].type == PROP_DELETED)
            break;
        if(jsdisp->props[ref].type != PROP_PROTREF)
            return;
        ref = jsdisp->props[ref].u.ref;
    }
    prop->type = PROP_DELETED;
}

static inline DISPID prop_to_id(jsdisp_t *This, dispex_prop_t *prop)
{
    /* don't overlap with DISPID_VALUE */
    return prop - This->props + 1;
}

static inline dispex_prop_t *get_prop(jsdisp_t *This, DISPID id)
{
    DWORD idx = id - 1;

    if(idx >= This->prop_cnt)
        return NULL;
    fix_protref_prop(This, &This->props[idx]);

    return This->props[idx].type == PROP_DELETED ? NULL : &This->props[idx];
}

static inline BOOL is_function_prop(dispex_prop_t *prop)
{
    BOOL ret = FALSE;

    if (is_object_instance(prop->u.val))
    {
        jsdisp_t *jsdisp = to_jsdisp(get_object(prop->u.val));

        if (jsdisp) ret = is_class(jsdisp, JSCLASS_FUNCTION);
    }
    return ret;
}

static BOOL is_enumerable(jsdisp_t *This, dispex_prop_t *prop)
{
    if(prop->type == PROP_PROTREF) {
        dispex_prop_t *parent = NULL;

        if(prop->u.ref < This->prototype->prop_cnt)
            parent = &This->prototype->props[prop->u.ref];

        if(!parent || parent->type == PROP_DELETED) {
            prop->type = PROP_DELETED;
            return FALSE;
        }

        return is_enumerable(This->prototype, parent);
    }

    return !!(prop->flags & PROPF_ENUMERABLE);
}

static const builtin_prop_t *find_builtin_prop(jsdisp_t *This, const WCHAR *name, BOOL case_insens)
{
    int min = 0, max = This->builtin_info->props_cnt-1, i, r;
    unsigned version;

    if(case_insens) {
        for(i = min; i <= max; i++)
            if(!wcsicmp(name, This->builtin_info->props[i].name))
                goto found;
        return NULL;
    }

    while(min <= max) {
        i = (min+max)/2;

        r = wcscmp(name, This->builtin_info->props[i].name);
        if(!r)
            goto found;

        if(r < 0)
            max = i-1;
        else
            min = i+1;
    }

    return NULL;

found:
    /* Skip prop if it's available only in higher compatibility mode. */
    version = (This->builtin_info->props[i].flags & PROPF_VERSION_MASK) >> PROPF_VERSION_SHIFT;
    if(version && version > This->ctx->version)
        return NULL;

    /* Skip prop if it's available only in HTML mode and we're not running in HTML mode. */
    if((This->builtin_info->props[i].flags & PROPF_HTML) && !This->ctx->html_mode)
        return NULL;

    return This->builtin_info->props + i;
}

static inline unsigned string_hash(const WCHAR *name)
{
    unsigned h = 0;
    for(; *name; name++)
        h = (h>>(sizeof(unsigned)*8-4)) ^ (h<<4) ^ towlower(*name);
    return h;
}

static inline unsigned get_props_idx(jsdisp_t *This, unsigned hash)
{
    return (hash*GOLDEN_RATIO) & (This->buf_size-1);
}

static inline HRESULT resize_props(jsdisp_t *This)
{
    dispex_prop_t *props;
    int i, bucket;

    if(This->buf_size != This->prop_cnt)
        return S_FALSE;

    props = realloc(This->props, sizeof(dispex_prop_t) * This->buf_size * 2);
    if(!props)
        return E_OUTOFMEMORY;
    This->buf_size *= 2;
    This->props = props;

    for(i=0; i<This->buf_size; i++) {
        This->props[i].bucket_head = ~0;
        This->props[i].bucket_next = ~0;
    }

    for(i=0; i<This->prop_cnt; i++) {
        props = This->props+i;

        bucket = get_props_idx(This, props->hash);
        props->bucket_next = This->props[bucket].bucket_head;
        This->props[bucket].bucket_head = i;
    }

    return S_OK;
}

static inline dispex_prop_t* alloc_prop(jsdisp_t *This, const WCHAR *name, prop_type_t type, DWORD flags)
{
    dispex_prop_t *prop;
    unsigned bucket;

    if(FAILED(resize_props(This)))
        return NULL;

    prop = &This->props[This->prop_cnt];
    prop->name = wcsdup(name);
    if(!prop->name)
        return NULL;
    prop->type = type;
    prop->flags = flags;
    prop->hash = string_hash(name);

    bucket = get_props_idx(This, prop->hash);
    prop->bucket_next = This->props[bucket].bucket_head;
    This->props[bucket].bucket_head = This->prop_cnt++;
    return prop;
}

static dispex_prop_t *alloc_protref(jsdisp_t *This, const WCHAR *name, DWORD ref)
{
    dispex_prop_t *ret;

    ret = alloc_prop(This, name, PROP_PROTREF, 0);
    if(!ret)
        return NULL;

    ret->u.ref = ref;
    return ret;
}

static dispex_prop_t *lookup_dispex_prop(jsdisp_t *obj, unsigned hash, const WCHAR *name, BOOL case_insens)
{
    unsigned bucket, pos, prev = ~0;

    bucket = get_props_idx(obj, hash);
    pos = obj->props[bucket].bucket_head;
    while(pos != ~0) {
        if(case_insens ? !wcsicmp(name, obj->props[pos].name) : !wcscmp(name, obj->props[pos].name)) {
            if(prev != ~0) {
                obj->props[prev].bucket_next = obj->props[pos].bucket_next;
                obj->props[pos].bucket_next = obj->props[bucket].bucket_head;
                obj->props[bucket].bucket_head = pos;
            }

            return &obj->props[pos];
        }

        prev = pos;
        pos = obj->props[pos].bucket_next;
    }

    return NULL;
}

static HRESULT update_external_prop(jsdisp_t *obj, const WCHAR *name, dispex_prop_t *prop, const struct property_info *desc, dispex_prop_t **ret)
{
    HRESULT hres;

    if(desc->name)
        name = desc->name;

    if(!desc->iid) {
        if(!prop && !(prop = alloc_prop(obj, name, PROP_DELETED, 0)))
            return E_OUTOFMEMORY;
        prop->type = PROP_EXTERN;
        prop->u.id = desc->id;
    }else if(prop) {
        /* If a property for a host non-volatile already exists, it must have been deleted. */
        *ret = prop;
        return S_OK;
    }else if(desc->flags & PROPF_METHOD) {
        jsdisp_t *func;

        hres = create_host_function(obj->ctx, desc, DISPATCH_METHOD, &func);
        if(FAILED(hres))
            return hres;

        if(!(prop = alloc_prop(obj, name, PROP_JSVAL, 0)))
            return E_OUTOFMEMORY;
        prop->u.val = jsval_obj(func);
    }else {
        jsdisp_t *getter, *setter = NULL;

        hres = create_host_function(obj->ctx, desc, DISPATCH_PROPERTYGET, &getter);
        if(FAILED(hres))
            return hres;

        if(desc->flags & PROPF_WRITABLE) {
            hres = create_host_function(obj->ctx, desc, DISPATCH_PROPERTYPUT, &setter);
            if(FAILED(hres)) {
                jsdisp_release(getter);
                return hres;
            }
        }

        if(!(prop = alloc_prop(obj, name, PROP_ACCESSOR, 0)))
            return E_OUTOFMEMORY;
        prop->u.accessor.getter = getter;
        prop->u.accessor.setter = setter;
    }

    prop->flags = desc->flags & PROPF_ALL;
    *ret = prop;
    return S_OK;
}

static HRESULT find_external_prop(jsdisp_t *This, const WCHAR *name, BOOL case_insens, dispex_prop_t *prop, dispex_prop_t **ret)
{
    if(This->has_volatile_props || (!prop && This->builtin_info->lookup_prop)) {
        struct property_info desc;
        HRESULT hres;

        hres = This->builtin_info->lookup_prop(This, name,
                                               case_insens ? fdexNameCaseInsensitive : fdexNameCaseSensitive, &desc);
        if(hres != DISP_E_UNKNOWNNAME) {
            if(FAILED(hres))
                return hres;

            if(prop && desc.name && wcscmp(prop->name, desc.name)) {
                prop = lookup_dispex_prop(This, string_hash(desc.name), desc.name, case_insens);
                if(prop && prop->type != PROP_EXTERN && prop->type != PROP_DELETED && prop->type != PROP_PROTREF) {
                    *ret = prop;
                    return S_OK;
                }
            }

            return update_external_prop(This, name, prop, &desc, ret);
        }else if(prop && prop->type == PROP_EXTERN) {
            prop->type = PROP_DELETED;
        }
    }

    *ret = prop;
    return S_OK;
}

static HRESULT find_prop_name(jsdisp_t *This, unsigned hash, const WCHAR *name, BOOL case_insens,
                              dispex_prop_t *prop, dispex_prop_t **ret)
{
    const builtin_prop_t *builtin;
    HRESULT hres;

    if(!prop)
        prop = lookup_dispex_prop(This, hash, name, case_insens);
    if(prop && prop->type != PROP_DELETED && prop->type != PROP_EXTERN) {
        *ret = prop;
        return S_OK;
    }

    if(!prop && (builtin = find_builtin_prop(This, name, case_insens))) {
        unsigned flags = builtin->flags;
        if(flags & PROPF_METHOD) {
            jsdisp_t *obj;

            hres = create_builtin_function(This->ctx, builtin->invoke, builtin->name, NULL, flags, NULL, &obj);
            if(FAILED(hres))
                return hres;

            prop = alloc_prop(This, builtin->name, PROP_JSVAL, (flags & PROPF_ALL) | PROPF_WRITABLE | PROPF_CONFIGURABLE);
            if(!prop) {
                jsdisp_release(obj);
                return E_OUTOFMEMORY;
            }

            prop->type = PROP_JSVAL;
            prop->u.val = jsval_obj(obj);
            *ret = prop;
            return S_OK;
        }else if(builtin->setter)
            flags |= PROPF_WRITABLE;
        flags &= PROPF_ENUMERABLE | PROPF_WRITABLE | PROPF_CONFIGURABLE;
        prop = alloc_prop(This, builtin->name, PROP_BUILTIN, flags);
        if(!prop)
            return E_OUTOFMEMORY;

        prop->u.p = builtin;
        *ret = prop;
        return S_OK;
    }

    return find_external_prop(This, name, case_insens, prop, ret);
}

static HRESULT find_prop_name_prot(jsdisp_t *This, unsigned hash, const WCHAR *name, BOOL case_insens,
                                   dispex_prop_t *own_prop, dispex_prop_t **ret)
{
    dispex_prop_t *prot_prop = NULL;
    HRESULT hres;

    hres = find_prop_name(This, hash, name, case_insens, own_prop, &own_prop);
    if(FAILED(hres))
        return hres;
    if(own_prop) {
        if(own_prop->type == PROP_PROTREF) {
            prot_prop = &This->prototype->props[own_prop->u.ref];
        }else if(own_prop->type != PROP_DELETED) {
            *ret = own_prop;
            return S_OK;
        }
    }

    if(This->prototype) {
        hres = find_prop_name_prot(This->prototype, hash, name, case_insens, prot_prop, &prot_prop);
        if(FAILED(hres))
            return hres;
        if(prot_prop && prot_prop->type != PROP_DELETED) {
            if(own_prop && case_insens && wcscmp(prot_prop->name, own_prop->name)) {
                hres = find_prop_name(This, prot_prop->hash, prot_prop->name, FALSE, NULL, &own_prop);
                if(FAILED(hres))
                    return hres;
                if(own_prop && own_prop->type != PROP_DELETED) {
                    *ret = own_prop;
                    return S_OK;
                }
            }
            if(own_prop) {
                own_prop->type = PROP_PROTREF;
                own_prop->u.ref = prot_prop - This->prototype->props;
            }else {
                own_prop = alloc_protref(This, prot_prop->name, prot_prop - This->prototype->props);
                if(!own_prop)
                    return E_OUTOFMEMORY;
            }
        }else if(own_prop) {
            own_prop->type = PROP_DELETED;
        }
    }

    *ret = own_prop;
    return S_OK;
}

static HRESULT ensure_prop_name(jsdisp_t *This, const WCHAR *name, DWORD create_flags, BOOL case_insens, dispex_prop_t **ret)
{
    dispex_prop_t *prop;
    HRESULT hres;

    hres = find_prop_name_prot(This, string_hash(name), name, case_insens, NULL, &prop);
    if(SUCCEEDED(hres) && (!prop || prop->type == PROP_DELETED)) {
        TRACE("creating prop %s flags %lx\n", debugstr_w(name), create_flags);

        if(!prop) {
            prop = alloc_prop(This, name, PROP_DELETED, 0);
            if(!prop)
                return E_OUTOFMEMORY;
        }

        if(This->has_volatile_props) {
            struct property_info desc;
            hres = This->builtin_info->lookup_prop(This, name, fdexNameEnsure, &desc);
            if(hres == S_OK)
                return update_external_prop(This, name, prop, &desc, ret);
        }

        hres = S_OK;
        prop->type = PROP_JSVAL;
        prop->flags = create_flags;
        prop->u.val = jsval_undefined();
    }

    *ret = prop;
    return hres;
}

HRESULT jsdisp_index_lookup(jsdisp_t *obj, const WCHAR *name, unsigned length, struct property_info *desc)
{
    const WCHAR *ptr;
    unsigned idx = 0;

    for(ptr = name; is_digit(*ptr); ptr++) {
        idx = idx * 10 + (*ptr - '0');
        if (idx >= length)
            return DISP_E_UNKNOWNNAME;
    }
    if(*ptr)
        return DISP_E_UNKNOWNNAME;

    desc->id = idx;
    desc->flags = PROPF_ENUMERABLE;
    if(obj->builtin_info->prop_put)
        desc->flags |= PROPF_WRITABLE;
    desc->name = NULL;
    desc->index = idx;
    desc->iid = 0;
    return S_OK;
}

static IDispatch *get_this(DISPPARAMS *dp)
{
    DWORD i;

    for(i=0; i < dp->cNamedArgs; i++) {
        if(dp->rgdispidNamedArgs[i] == DISPID_THIS) {
            if(V_VT(dp->rgvarg+i) == VT_DISPATCH)
                return V_DISPATCH(dp->rgvarg+i);

            WARN("This is not VT_DISPATCH\n");
            return NULL;
        }
    }

    TRACE("no this passed\n");
    return NULL;
}

static HRESULT convert_params(script_ctx_t *ctx, const DISPPARAMS *dp, jsval_t *buf, unsigned *argc, jsval_t **ret)
{
    jsval_t *argv;
    unsigned cnt;
    unsigned i;
    HRESULT hres;

    cnt = dp->cArgs - dp->cNamedArgs;

    if(cnt > 6) {
        argv = malloc(cnt * sizeof(*argv));
        if(!argv)
            return E_OUTOFMEMORY;
    }else {
        argv = buf;
    }

    for(i = 0; i < cnt; i++) {
        hres = variant_to_jsval(ctx, dp->rgvarg+dp->cArgs-i-1, argv+i);
        if(FAILED(hres)) {
            while(i--)
                jsval_release(argv[i]);
            if(argv != buf)
                free(argv);
            return hres;
        }
    }

    *argc = cnt;
    *ret = argv;
    return S_OK;
}

static HRESULT prop_get(jsdisp_t *This, IDispatch *jsthis, dispex_prop_t *prop, jsval_t *r)
{
    jsdisp_t *prop_obj = This;
    HRESULT hres;

    while(prop->type == PROP_PROTREF) {
        prop_obj = prop_obj->prototype;
        prop = prop_obj->props + prop->u.ref;
    }

    switch(prop->type) {
    case PROP_BUILTIN:
        hres = prop->u.p->getter(This->ctx, prop_obj, r);
        break;
    case PROP_JSVAL:
        hres = jsval_copy(prop->u.val, r);
        break;
    case PROP_ACCESSOR:
        if(prop->u.accessor.getter) {
            hres = jsdisp_call_value(prop->u.accessor.getter, jsval_disp(jsthis),
                                     DISPATCH_METHOD, 0, NULL, r);
        }else {
            *r = jsval_undefined();
            hres = S_OK;
        }
        break;
    case PROP_EXTERN:
        hres = prop_obj->builtin_info->prop_get(prop_obj, prop->u.id, r);
        break;
    default:
        ERR("type %d\n", prop->type);
        return E_FAIL;
    }

    if(FAILED(hres)) {
        TRACE("fail %08lx\n", hres);
        return hres;
    }

    TRACE("%p.%s ret %s\n", This, debugstr_w(prop->name), debugstr_jsval(*r));
    return hres;
}

static HRESULT prop_put(jsdisp_t *This, dispex_prop_t *prop, jsval_t val)
{
    HRESULT hres;

    if(prop->type == PROP_PROTREF) {
        dispex_prop_t *prop_iter = prop;
        jsdisp_t *prototype_iter = This;

        do {
            prototype_iter = prototype_iter->prototype;
            prop_iter = prototype_iter->props + prop_iter->u.ref;
        } while(prop_iter->type == PROP_PROTREF);

        if(prop_iter->type == PROP_ACCESSOR)
            prop = prop_iter;
    }

    switch(prop->type) {
    case PROP_BUILTIN:
        if(!prop->u.p->setter) {
            TRACE("getter with no setter\n");
            return S_OK;
        }
        return prop->u.p->setter(This->ctx, This, val);
    case PROP_PROTREF:
    case PROP_DELETED:
        if(!This->extensible)
            return S_OK;
        prop->type = PROP_JSVAL;
        prop->flags = PROPF_ENUMERABLE | PROPF_CONFIGURABLE | PROPF_WRITABLE;
        prop->u.val = jsval_undefined();
        break;
    case PROP_JSVAL:
        if(!(prop->flags & PROPF_WRITABLE))
            return S_OK;

        jsval_release(prop->u.val);
        break;
    case PROP_ACCESSOR:
        if(!prop->u.accessor.setter) {
            TRACE("no setter\n");
            return S_OK;
        }
        return jsdisp_call_value(prop->u.accessor.setter, jsval_obj(This), DISPATCH_METHOD, 1, &val, NULL);
    case PROP_EXTERN:
        if(!This->builtin_info->prop_put) {
            TRACE("no prop_put\n");
            return S_OK;
        }
        if(!(prop->flags & PROPF_WRITABLE))
            return S_OK;
        hres = This->builtin_info->prop_put(This, prop->u.id, val);
        if(hres != S_FALSE)
            return hres;
        prop->type = PROP_JSVAL;
        prop->flags = PROPF_ENUMERABLE | PROPF_CONFIGURABLE | PROPF_WRITABLE;
        prop->u.val = jsval_undefined();
        break;
    default:
        ERR("type %d\n", prop->type);
        return E_FAIL;
    }

    TRACE("%p.%s = %s\n", This, debugstr_w(prop->name), debugstr_jsval(val));

    hres = jsval_copy(val, &prop->u.val);
    if(FAILED(hres))
        return hres;

    if(This->builtin_info->on_put)
        This->builtin_info->on_put(This, prop->name);

    return S_OK;
}

static HRESULT invoke_prop_func(jsdisp_t *This, IDispatch *jsthis, dispex_prop_t *prop, WORD flags,
        unsigned argc, jsval_t *argv, jsval_t *r, IServiceProvider *caller)
{
    HRESULT hres;

    switch(prop->type) {
    case PROP_BUILTIN:
        return JS_E_FUNCTION_EXPECTED;
    case PROP_PROTREF:
        return invoke_prop_func(This->prototype, jsthis ? jsthis : to_disp(This),
                                This->prototype->props+prop->u.ref, flags, argc, argv, r, caller);
    case PROP_JSVAL: {
        if(!is_object_instance(prop->u.val)) {
            FIXME("value %s is not a function\n", debugstr_jsval(prop->u.val));
            return JS_E_FUNCTION_EXPECTED;
        }

        TRACE("call %s %p\n", debugstr_w(prop->name), get_object(prop->u.val));

        return disp_call_value_with_caller(This->ctx, get_object(prop->u.val),
                jsval_disp(jsthis ? jsthis : to_disp(This)),
                flags, argc, argv, r, caller);
    }
    case PROP_ACCESSOR:
    case PROP_EXTERN: {
        jsval_t val;

        hres = prop_get(This, jsthis ? jsthis : to_disp(This), prop, &val);
        if(FAILED(hres))
            return hres;

        if(is_object_instance(val)) {
            jsdisp_t *jsfunc = to_jsdisp(get_object(val));
            if(!jsfunc || is_class(jsfunc, JSCLASS_FUNCTION))
                hres = disp_call_value_with_caller(This->ctx, get_object(val),
                                                   jsval_disp(jsthis ? jsthis : to_disp(This)),
                                                   flags, argc, argv, r, caller);
            else
                hres = JS_E_INVALID_PROPERTY;
        }else {
            WARN("value %s is not a function\n", debugstr_jsval(val));
            hres = JS_E_FUNCTION_EXPECTED;
        }

        jsval_release(val);
        return hres;
    }
    case PROP_DELETED:
        assert(0);
        break;
    }

    return E_FAIL;
}

HRESULT builtin_set_const(script_ctx_t *ctx, jsdisp_t *jsthis, jsval_t value)
{
    TRACE("%p %s\n", jsthis, debugstr_jsval(value));
    return S_OK;
}

static HRESULT fill_props(jsdisp_t *obj)
{
    dispex_prop_t *prop;
    HRESULT hres;
    DWORD i;

    if(obj->props_filled)
        return S_OK;

    for(i = 0; i < obj->builtin_info->props_cnt; i++) {
        hres = find_prop_name(obj, string_hash(obj->builtin_info->props[i].name), obj->builtin_info->props[i].name, FALSE, NULL, &prop);
        if(FAILED(hres))
            return hres;
    }
    hres = S_OK;

    if(obj->builtin_info->fill_props) {
        hres = obj->builtin_info->fill_props(obj);
        if(FAILED(hres))
            return hres;
    }

    if(hres == S_OK)
        obj->props_filled = TRUE;
    return S_OK;
}

static HRESULT fill_protrefs(jsdisp_t *This)
{
    dispex_prop_t *iter, *prop;
    HRESULT hres;

    hres = fill_props(This);
    if(FAILED(hres))
        return hres;

    if(!This->prototype)
        return S_OK;

    hres = fill_protrefs(This->prototype);
    if(FAILED(hres))
        return hres;

    for(iter = This->prototype->props; iter < This->prototype->props+This->prototype->prop_cnt; iter++) {
        hres = find_prop_name(This, iter->hash, iter->name, FALSE, NULL, &prop);
        if(FAILED(hres))
            return hres;
        if(!prop || prop->type==PROP_DELETED) {
            if(prop) {
                prop->type = PROP_PROTREF;
                prop->flags = 0;
                prop->u.ref = iter - This->prototype->props;
            }else {
                prop = alloc_protref(This, iter->name, iter - This->prototype->props);
                if(!prop)
                    return E_OUTOFMEMORY;
            }
        }
    }

    return S_OK;
}

static void unlink_jsdisp(jsdisp_t *jsdisp)
{
    dispex_prop_t *prop = jsdisp->props, *end;

    for(end = prop + jsdisp->prop_cnt; prop < end; prop++) {
        switch(prop->type) {
        case PROP_DELETED:
            continue;
        case PROP_JSVAL:
            jsval_release(prop->u.val);
            break;
        case PROP_ACCESSOR:
            if(prop->u.accessor.getter)
                jsdisp_release(prop->u.accessor.getter);
            if(prop->u.accessor.setter)
                jsdisp_release(prop->u.accessor.setter);
            break;
        default:
            break;
        }
        prop->type = PROP_DELETED;
    }

    if(jsdisp->prototype) {
        jsdisp_release(jsdisp->prototype);
        jsdisp->prototype = NULL;
    }

    if(jsdisp->builtin_info->gc_traverse)
        jsdisp->builtin_info->gc_traverse(NULL, GC_TRAVERSE_UNLINK, jsdisp);
}



/*
 * To deal with circular refcounts, a basic Garbage Collector is used with a variant of the
 * mark-and-sweep algorithm that doesn't require knowing or traversing any specific "roots".
 * This works based on the assumption that circular references can only happen when objects
 * end up pointing to each other, and each other alone, without any external refs.
 *
 * An "external ref" is a ref to the object that's not from any other object. Example of such
 * refs can be local variables, the script ctx (which keeps a ref to the global object), etc.
 *
 * At a high level, there are 3 logical passes done on the entire list of objects:
 *
 * 1. Speculatively decrease refcounts of each linked-to-object from each object. This ensures
 *    that the only remaining refcount on each object is the number of "external refs" to it.
 *    At the same time, mark all of the objects so that they can be potentially collected.
 *
 * 2. For each object with a non-zero "external refcount", clear the mark from step 1, and
 *    recursively traverse all linked objects from it, clearing their marks as well (regardless
 *    of their refcount), stopping a given path when the object is unmarked (and then going back
 *    up the GC stack). This basically unmarks all of the objects with "external refcounts"
 *    and those accessible from them, and only the leaked dangling objects will still be marked.
 *
 * 3. For each object that is marked, unlink all of the objects linked from it, because they
 *    are dangling in a circular refcount and not accessible. This should release them.
 *
 * During unlinking (GC_TRAVERSE_UNLINK), it is important that we unlink *all* linked objects
 * from the object, to be certain that releasing the object later will not delete any other
 * objects. Otherwise calculating the "next" object in the list becomes impossible.
 *
 * This collection process has to be done periodically, but can be pretty expensive so there
 * has to be a balance between reclaiming dangling objects and performance.
 *
 */
struct gc_stack_chunk {
    jsdisp_t *objects[1020];
    struct gc_stack_chunk *prev;
};

struct gc_ctx {
    struct gc_stack_chunk *chunk;
    struct gc_stack_chunk *next;
    unsigned idx;
};

static HRESULT gc_stack_push(struct gc_ctx *gc_ctx, jsdisp_t *obj)
{
    if(!gc_ctx->idx) {
        if(gc_ctx->next)
            gc_ctx->chunk = gc_ctx->next;
        else {
            struct gc_stack_chunk *prev, *tmp = malloc(sizeof(*tmp));
            if(!tmp)
                return E_OUTOFMEMORY;
            prev = gc_ctx->chunk;
            gc_ctx->chunk = tmp;
            gc_ctx->chunk->prev = prev;
        }
        gc_ctx->idx = ARRAY_SIZE(gc_ctx->chunk->objects);
        gc_ctx->next = NULL;
    }
    gc_ctx->chunk->objects[--gc_ctx->idx] = obj;
    return S_OK;
}

static jsdisp_t *gc_stack_pop(struct gc_ctx *gc_ctx)
{
    jsdisp_t *obj = gc_ctx->chunk->objects[gc_ctx->idx];

    if(++gc_ctx->idx == ARRAY_SIZE(gc_ctx->chunk->objects)) {
        free(gc_ctx->next);
        gc_ctx->next = gc_ctx->chunk;
        gc_ctx->chunk = gc_ctx->chunk->prev;
        gc_ctx->idx = 0;
    }
    return obj;
}

HRESULT gc_run(script_ctx_t *ctx)
{
    /* Save original refcounts in a linked list of chunks */
    struct chunk
    {
        struct chunk *next;
        LONG ref[1020];
    } *head, *chunk;
    struct thread_data *thread_data = ctx->thread_data;
    jsdisp_t *obj, *obj2, *link, *link2;
    dispex_prop_t *prop, *props_end;
    struct gc_ctx gc_ctx = { 0 };
    unsigned chunk_idx = 0;
    HRESULT hres = S_OK;
    struct list *iter;

    /* Prevent recursive calls from side-effects during unlinking (e.g. CollectGarbage from host object's Release) */
    if(thread_data->gc_is_unlinking)
        return S_OK;

    if(!(head = malloc(sizeof(*head))))
        return E_OUTOFMEMORY;
    head->next = NULL;
    chunk = head;

    /* 1. Save actual refcounts and decrease them speculatively as-if we unlinked the objects */
    LIST_FOR_EACH_ENTRY(obj, &thread_data->objects, jsdisp_t, entry) {
        if(chunk_idx == ARRAY_SIZE(chunk->ref)) {
            if(!(chunk->next = malloc(sizeof(*chunk)))) {
                do {
                    chunk = head->next;
                    free(head);
                    head = chunk;
                } while(head);
                return E_OUTOFMEMORY;
            }
            chunk = chunk->next; chunk_idx = 0;
            chunk->next = NULL;
        }
        chunk->ref[chunk_idx++] = obj->ref;
    }
    LIST_FOR_EACH_ENTRY(obj, &thread_data->objects, jsdisp_t, entry) {
        /* Skip objects with external reference counter */
        if(obj->builtin_info->addref) {
            obj->gc_marked = FALSE;
            continue;
        }
        for(prop = obj->props, props_end = prop + obj->prop_cnt; prop < props_end; prop++) {
            switch(prop->type) {
            case PROP_JSVAL:
                if(is_object_instance(prop->u.val) && (link = to_jsdisp(get_object(prop->u.val))))
                    link->ref--;
                break;
            case PROP_ACCESSOR:
                if(prop->u.accessor.getter)
                    prop->u.accessor.getter->ref--;
                if(prop->u.accessor.setter)
                    prop->u.accessor.setter->ref--;
                break;
            default:
                break;
            }
        }

        if(obj->prototype)
            obj->prototype->ref--;
        if(obj->builtin_info->gc_traverse)
            obj->builtin_info->gc_traverse(&gc_ctx, GC_TRAVERSE_SPECULATIVELY, obj);
        obj->gc_marked = TRUE;
    }

    /* 2. Clear mark on objects with non-zero "external refcount" and all objects accessible from them */
    LIST_FOR_EACH_ENTRY(obj, &thread_data->objects, jsdisp_t, entry) {
        if(!obj->ref || !obj->gc_marked)
            continue;

        hres = gc_stack_push(&gc_ctx, NULL);
        if(FAILED(hres))
            break;

        obj2 = obj;
        do
        {
            obj2->gc_marked = FALSE;

            for(prop = obj2->props, props_end = prop + obj2->prop_cnt; prop < props_end; prop++) {
                switch(prop->type) {
                case PROP_JSVAL:
                    if(!is_object_instance(prop->u.val))
                        continue;
                    link = to_jsdisp(get_object(prop->u.val));
                    link2 = NULL;
                    break;
                case PROP_ACCESSOR:
                    link = prop->u.accessor.getter;
                    link2 = prop->u.accessor.setter;
                    break;
                default:
                    continue;
                }
                if(link && link->gc_marked) {
                    hres = gc_stack_push(&gc_ctx, link);
                    if(FAILED(hres))
                        break;
                }
                if(link2 && link2->gc_marked) {
                    hres = gc_stack_push(&gc_ctx, link2);
                    if(FAILED(hres))
                        break;
                }
            }

            if(FAILED(hres))
                break;

            if(obj2->prototype && obj2->prototype->gc_marked) {
                hres = gc_stack_push(&gc_ctx, obj2->prototype);
                if(FAILED(hres))
                    break;
            }

            if(obj2->builtin_info->gc_traverse) {
                hres = obj2->builtin_info->gc_traverse(&gc_ctx, GC_TRAVERSE, obj2);
                if(FAILED(hres))
                    break;
            }

            /* For weak refs, traverse paths accessible from it via the WeakMaps, if the WeakMaps are alive at this point.
               We need both the key and the WeakMap for the entry to actually be accessible (and thus traversed). */
            if(obj2->has_weak_refs) {
                struct list *list = &RB_ENTRY_VALUE(rb_get(&thread_data->weak_refs, obj2), struct weak_refs_entry, entry)->list;
                struct weakmap_entry *entry;

                LIST_FOR_EACH_ENTRY(entry, list, struct weakmap_entry, weak_refs_entry) {
                    if(!entry->weakmap->gc_marked && is_object_instance(entry->value) && (link = to_jsdisp(get_object(entry->value)))) {
                        hres = gc_stack_push(&gc_ctx, link);
                        if(FAILED(hres))
                            break;
                    }
                }

                if(FAILED(hres))
                    break;
            }

            do obj2 = gc_stack_pop(&gc_ctx); while(obj2 && !obj2->gc_marked);
        } while(obj2);

        if(FAILED(hres)) {
            do obj2 = gc_stack_pop(&gc_ctx); while(obj2);
            break;
        }
    }
    free(gc_ctx.next);

    /* Restore */
    chunk = head; chunk_idx = 0;
    LIST_FOR_EACH_ENTRY(obj, &thread_data->objects, jsdisp_t, entry) {
        obj->ref = chunk->ref[chunk_idx++];
        if(chunk_idx == ARRAY_SIZE(chunk->ref)) {
            struct chunk *next = chunk->next;
            free(chunk);
            chunk = next; chunk_idx = 0;
        }
    }
    free(chunk);

    if(FAILED(hres))
        return hres;

    /* 3. Remove all the links from the marked objects, since they are dangling */
    thread_data->gc_is_unlinking = TRUE;

    iter = list_head(&thread_data->objects);
    while(iter) {
        obj = LIST_ENTRY(iter, jsdisp_t, entry);
        if(!obj->gc_marked) {
            iter = list_next(&thread_data->objects, iter);
            continue;
        }

        /* Grab it since it gets removed when unlinked */
        jsdisp_addref(obj);
        unlink_jsdisp(obj);

        /* Releasing unlinked object should not delete any other object,
           so we can safely obtain the next pointer now */
        iter = list_next(&thread_data->objects, iter);
        jsdisp_release(obj);
    }

    thread_data->gc_is_unlinking = FALSE;
    thread_data->gc_last_tick = GetTickCount();
    return S_OK;
}

HRESULT gc_process_linked_obj(struct gc_ctx *gc_ctx, enum gc_traverse_op op, jsdisp_t *obj, jsdisp_t *link, void **unlink_ref)
{
    if(op == GC_TRAVERSE_UNLINK) {
        *unlink_ref = NULL;
        jsdisp_release(link);
        return S_OK;
    }

    if(op == GC_TRAVERSE_SPECULATIVELY)
        link->ref--;
    else if(link->gc_marked)
        return gc_stack_push(gc_ctx, link);
    return S_OK;
}

HRESULT gc_process_linked_val(struct gc_ctx *gc_ctx, enum gc_traverse_op op, jsdisp_t *obj, jsval_t *link)
{
    jsdisp_t *jsdisp;

    if(op == GC_TRAVERSE_UNLINK) {
        jsval_t val = *link;
        *link = jsval_undefined();
        jsval_release(val);
        return S_OK;
    }

    if(!is_object_instance(*link) || !(jsdisp = to_jsdisp(get_object(*link))))
        return S_OK;
    if(op == GC_TRAVERSE_SPECULATIVELY)
        jsdisp->ref--;
    else if(jsdisp->gc_marked)
        return gc_stack_push(gc_ctx, jsdisp);
    return S_OK;
}



struct typeinfo_func {
    dispex_prop_t *prop;
    function_code_t *code;
};

typedef struct {
    ITypeInfo ITypeInfo_iface;
    ITypeComp ITypeComp_iface;
    LONG ref;

    UINT num_funcs;
    UINT num_vars;
    struct typeinfo_func *funcs;
    dispex_prop_t **vars;

    jsdisp_t *jsdisp;
} ScriptTypeInfo;

static struct typeinfo_func *get_func_from_memid(const ScriptTypeInfo *typeinfo, MEMBERID memid)
{
    UINT a = 0, b = typeinfo->num_funcs;

    while (a < b)
    {
        UINT i = (a + b - 1) / 2;
        MEMBERID func_memid = prop_to_id(typeinfo->jsdisp, typeinfo->funcs[i].prop);

        if (memid == func_memid)
            return &typeinfo->funcs[i];
        else if (memid < func_memid)
            b = i;
        else
            a = i + 1;
    }
    return NULL;
}

static dispex_prop_t *get_var_from_memid(const ScriptTypeInfo *typeinfo, MEMBERID memid)
{
    UINT a = 0, b = typeinfo->num_vars;

    while (a < b)
    {
        UINT i = (a + b - 1) / 2;
        MEMBERID var_memid = prop_to_id(typeinfo->jsdisp, typeinfo->vars[i]);

        if (memid == var_memid)
            return typeinfo->vars[i];
        else if (memid < var_memid)
            b = i;
        else
            a = i + 1;
    }
    return NULL;
}

static inline ScriptTypeInfo *ScriptTypeInfo_from_ITypeInfo(ITypeInfo *iface)
{
    return CONTAINING_RECORD(iface, ScriptTypeInfo, ITypeInfo_iface);
}

static inline ScriptTypeInfo *ScriptTypeInfo_from_ITypeComp(ITypeComp *iface)
{
    return CONTAINING_RECORD(iface, ScriptTypeInfo, ITypeComp_iface);
}

static HRESULT WINAPI ScriptTypeInfo_QueryInterface(ITypeInfo *iface, REFIID riid, void **ppv)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);

    if (IsEqualGUID(&IID_IUnknown, riid) || IsEqualGUID(&IID_ITypeInfo, riid))
        *ppv = &This->ITypeInfo_iface;
    else if (IsEqualGUID(&IID_ITypeComp, riid))
        *ppv = &This->ITypeComp_iface;
    else
    {
        WARN("(%p)->(%s %p)\n", This, debugstr_guid(riid), ppv);
        *ppv = NULL;
        return E_NOINTERFACE;
    }

    TRACE("(%p)->(%s %p)\n", This, debugstr_guid(riid), ppv);
    IUnknown_AddRef((IUnknown*)*ppv);
    return S_OK;
}

static ULONG WINAPI ScriptTypeInfo_AddRef(ITypeInfo *iface)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);
    LONG ref = InterlockedIncrement(&This->ref);

    TRACE("(%p) ref=%ld\n", This, ref);

    return ref;
}

static ULONG WINAPI ScriptTypeInfo_Release(ITypeInfo *iface)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);
    LONG ref = InterlockedDecrement(&This->ref);
    UINT i;

    TRACE("(%p) ref=%ld\n", This, ref);

    if (!ref)
    {
        for (i = This->num_funcs; i--;)
            release_bytecode(This->funcs[i].code->bytecode);
        jsdisp_release(This->jsdisp);
        free(This->funcs);
        free(This->vars);
        free(This);
    }
    return ref;
}

static HRESULT WINAPI ScriptTypeInfo_GetTypeAttr(ITypeInfo *iface, TYPEATTR **ppTypeAttr)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);
    TYPEATTR *attr;

    TRACE("(%p)->(%p)\n", This, ppTypeAttr);

    if (!ppTypeAttr) return E_INVALIDARG;

    attr = calloc(1, sizeof(*attr));
    if (!attr) return E_OUTOFMEMORY;

    attr->guid = GUID_JScriptTypeInfo;
    attr->lcid = LOCALE_USER_DEFAULT;
    attr->memidConstructor = MEMBERID_NIL;
    attr->memidDestructor = MEMBERID_NIL;
    attr->cbSizeInstance = 4;
    attr->typekind = TKIND_DISPATCH;
    attr->cFuncs = This->num_funcs;
    attr->cVars = This->num_vars;
    attr->cImplTypes = 1;
    attr->cbSizeVft = sizeof(IDispatchVtbl);
    attr->cbAlignment = 4;
    attr->wTypeFlags = TYPEFLAG_FDISPATCHABLE;
    attr->wMajorVerNum = JSCRIPT_MAJOR_VERSION;
    attr->wMinorVerNum = JSCRIPT_MINOR_VERSION;

    *ppTypeAttr = attr;
    return S_OK;
}

static HRESULT WINAPI ScriptTypeInfo_GetTypeComp(ITypeInfo *iface, ITypeComp **ppTComp)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);

    TRACE("(%p)->(%p)\n", This, ppTComp);

    if (!ppTComp) return E_INVALIDARG;

    *ppTComp = &This->ITypeComp_iface;
    ITypeInfo_AddRef(iface);
    return S_OK;
}

static HRESULT WINAPI ScriptTypeInfo_GetFuncDesc(ITypeInfo *iface, UINT index, FUNCDESC **ppFuncDesc)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);
    struct typeinfo_func *func;
    FUNCDESC *desc;
    unsigned i;

    TRACE("(%p)->(%u %p)\n", This, index, ppFuncDesc);

    if (!ppFuncDesc) return E_INVALIDARG;
    if (index >= This->num_funcs) return TYPE_E_ELEMENTNOTFOUND;
    func = &This->funcs[index];

    /* Store the parameter array after the FUNCDESC structure */
    desc = calloc(1, sizeof(*desc) + sizeof(ELEMDESC) * func->code->param_cnt);
    if (!desc) return E_OUTOFMEMORY;

    desc->memid = prop_to_id(This->jsdisp, func->prop);
    desc->funckind = FUNC_DISPATCH;
    desc->invkind = INVOKE_FUNC;
    desc->callconv = CC_STDCALL;
    desc->cParams = func->code->param_cnt;
    desc->elemdescFunc.tdesc.vt = VT_VARIANT;

    if (func->code->param_cnt) desc->lprgelemdescParam = (ELEMDESC*)(desc + 1);
    for (i = 0; i < func->code->param_cnt; i++)
        desc->lprgelemdescParam[i].tdesc.vt = VT_VARIANT;

    *ppFuncDesc = desc;
    return S_OK;
}

static HRESULT WINAPI ScriptTypeInfo_GetVarDesc(ITypeInfo *iface, UINT index, VARDESC **ppVarDesc)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);
    VARDESC *desc;

    TRACE("(%p)->(%u %p)\n", This, index, ppVarDesc);

    if (!ppVarDesc) return E_INVALIDARG;
    if (index >= This->num_vars) return TYPE_E_ELEMENTNOTFOUND;

    desc = calloc(1, sizeof(*desc));
    if (!desc) return E_OUTOFMEMORY;

    desc->memid = prop_to_id(This->jsdisp, This->vars[index]);
    desc->varkind = VAR_DISPATCH;
    desc->elemdescVar.tdesc.vt = VT_VARIANT;

    *ppVarDesc = desc;
    return S_OK;
}

static HRESULT WINAPI ScriptTypeInfo_GetNames(ITypeInfo *iface, MEMBERID memid, BSTR *rgBstrNames,
        UINT cMaxNames, UINT *pcNames)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);
    struct typeinfo_func *func;
    ITypeInfo *disp_typeinfo;
    dispex_prop_t *var;
    HRESULT hr;
    UINT i = 0;

    TRACE("(%p)->(%ld %p %u %p)\n", This, memid, rgBstrNames, cMaxNames, pcNames);

    if (!rgBstrNames || !pcNames) return E_INVALIDARG;
    if (memid <= 0) return TYPE_E_ELEMENTNOTFOUND;

    func = get_func_from_memid(This, memid);
    if (!func)
    {
        var = get_var_from_memid(This, memid);
        if (!var)
        {
            hr = get_dispatch_typeinfo(&disp_typeinfo);
            if (FAILED(hr)) return hr;

            return ITypeInfo_GetNames(disp_typeinfo, memid, rgBstrNames, cMaxNames, pcNames);
        }
    }

    *pcNames = 0;
    if (!cMaxNames) return S_OK;

    rgBstrNames[0] = SysAllocString(func ? func->prop->name : var->name);
    if (!rgBstrNames[0]) return E_OUTOFMEMORY;
    i++;

    if (func)
    {
        unsigned num = min(cMaxNames, func->code->param_cnt + 1);

        for (; i < num; i++)
        {
            if (!(rgBstrNames[i] = SysAllocString(func->code->params[i - 1])))
            {
                do SysFreeString(rgBstrNames[--i]); while (i);
                return E_OUTOFMEMORY;
            }
        }
    }

    *pcNames = i;
    return S_OK;
}

static HRESULT WINAPI ScriptTypeInfo_GetRefTypeOfImplType(ITypeInfo *iface, UINT index, HREFTYPE *pRefType)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);

    TRACE("(%p)->(%u %p)\n", This, index, pRefType);

    /* We only inherit from IDispatch */
    if (!pRefType) return E_INVALIDARG;
    if (index != 0) return TYPE_E_ELEMENTNOTFOUND;

    *pRefType = 1;
    return S_OK;
}

static HRESULT WINAPI ScriptTypeInfo_GetImplTypeFlags(ITypeInfo *iface, UINT index, INT *pImplTypeFlags)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);

    TRACE("(%p)->(%u %p)\n", This, index, pImplTypeFlags);

    if (!pImplTypeFlags) return E_INVALIDARG;
    if (index != 0) return TYPE_E_ELEMENTNOTFOUND;

    *pImplTypeFlags = 0;
    return S_OK;
}

static HRESULT WINAPI ScriptTypeInfo_GetIDsOfNames(ITypeInfo *iface, LPOLESTR *rgszNames, UINT cNames,
        MEMBERID *pMemId)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);
    ITypeInfo *disp_typeinfo;
    const WCHAR *name;
    HRESULT hr = S_OK;
    int i, j, arg;

    TRACE("(%p)->(%p %u %p)\n", This, rgszNames, cNames, pMemId);

    if (!rgszNames || !cNames || !pMemId) return E_INVALIDARG;

    for (i = 0; i < cNames; i++) pMemId[i] = MEMBERID_NIL;
    name = rgszNames[0];

    for (i = 0; i < This->num_funcs; i++)
    {
        struct typeinfo_func *func = &This->funcs[i];

        if (wcsicmp(name, func->prop->name)) continue;
        pMemId[0] = prop_to_id(This->jsdisp, func->prop);

        for (j = 1; j < cNames; j++)
        {
            name = rgszNames[j];
            for (arg = func->code->param_cnt; --arg >= 0;)
                if (!wcsicmp(name, func->code->params[arg]))
                    break;
            if (arg >= 0)
                pMemId[j] = arg;
            else
                hr = DISP_E_UNKNOWNNAME;
        }
        return hr;
    }

    for (i = 0; i < This->num_vars; i++)
    {
        dispex_prop_t *var = This->vars[i];

        if (wcsicmp(name, var->name)) continue;
        pMemId[0] = prop_to_id(This->jsdisp, var);
        return S_OK;
    }

    /* Look into the inherited IDispatch */
    hr = get_dispatch_typeinfo(&disp_typeinfo);
    if (FAILED(hr)) return hr;

    return ITypeInfo_GetIDsOfNames(disp_typeinfo, rgszNames, cNames, pMemId);
}

static HRESULT WINAPI ScriptTypeInfo_Invoke(ITypeInfo *iface, PVOID pvInstance, MEMBERID memid, WORD wFlags,
        DISPPARAMS *pDispParams, VARIANT *pVarResult, EXCEPINFO *pExcepInfo, UINT *puArgErr)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);
    ITypeInfo *disp_typeinfo;
    IDispatch *disp;
    HRESULT hr;

    TRACE("(%p)->(%p %ld %d %p %p %p %p)\n", This, pvInstance, memid, wFlags,
          pDispParams, pVarResult, pExcepInfo, puArgErr);

    if (!pvInstance) return E_INVALIDARG;
    if (memid <= 0) return TYPE_E_ELEMENTNOTFOUND;

    if (!get_func_from_memid(This, memid) && !get_var_from_memid(This, memid))
    {
        hr = get_dispatch_typeinfo(&disp_typeinfo);
        if (FAILED(hr)) return hr;

        return ITypeInfo_Invoke(disp_typeinfo, pvInstance, memid, wFlags, pDispParams,
                                pVarResult, pExcepInfo, puArgErr);
    }

    hr = IUnknown_QueryInterface((IUnknown*)pvInstance, &IID_IDispatch, (void**)&disp);
    if (FAILED(hr)) return hr;

    hr = IDispatch_Invoke(disp, memid, &IID_NULL, LOCALE_USER_DEFAULT, wFlags,
                          pDispParams, pVarResult, pExcepInfo, puArgErr);
    IDispatch_Release(disp);

    return hr;
}

static HRESULT WINAPI ScriptTypeInfo_GetDocumentation(ITypeInfo *iface, MEMBERID memid, BSTR *pBstrName,
        BSTR *pBstrDocString, DWORD *pdwHelpContext, BSTR *pBstrHelpFile)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);
    struct typeinfo_func *func;
    ITypeInfo *disp_typeinfo;
    dispex_prop_t *var;
    HRESULT hr;

    TRACE("(%p)->(%ld %p %p %p %p)\n", This, memid, pBstrName, pBstrDocString, pdwHelpContext, pBstrHelpFile);

    if (pBstrDocString) *pBstrDocString = NULL;
    if (pdwHelpContext) *pdwHelpContext = 0;
    if (pBstrHelpFile) *pBstrHelpFile = NULL;

    if (memid == MEMBERID_NIL)
    {
        if (pBstrName && !(*pBstrName = SysAllocString(L"JScriptTypeInfo")))
            return E_OUTOFMEMORY;
        if (pBstrDocString &&
            !(*pBstrDocString = SysAllocString(L"JScript Type Info")))
        {
            if (pBstrName) SysFreeString(*pBstrName);
            return E_OUTOFMEMORY;
        }
        return S_OK;
    }
    if (memid <= 0) return TYPE_E_ELEMENTNOTFOUND;

    func = get_func_from_memid(This, memid);
    if (!func)
    {
        var = get_var_from_memid(This, memid);
        if (!var)
        {
            hr = get_dispatch_typeinfo(&disp_typeinfo);
            if (FAILED(hr)) return hr;

            return ITypeInfo_GetDocumentation(disp_typeinfo, memid, pBstrName, pBstrDocString,
                                              pdwHelpContext, pBstrHelpFile);
        }
    }

    if (pBstrName)
    {
        *pBstrName = SysAllocString(func ? func->prop->name : var->name);

        if (!*pBstrName)
            return E_OUTOFMEMORY;
    }
    return S_OK;
}

static HRESULT WINAPI ScriptTypeInfo_GetDllEntry(ITypeInfo *iface, MEMBERID memid, INVOKEKIND invKind,
        BSTR *pBstrDllName, BSTR *pBstrName, WORD *pwOrdinal)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);
    ITypeInfo *disp_typeinfo;
    HRESULT hr;

    TRACE("(%p)->(%ld %d %p %p %p)\n", This, memid, invKind, pBstrDllName, pBstrName, pwOrdinal);

    if (pBstrDllName) *pBstrDllName = NULL;
    if (pBstrName) *pBstrName = NULL;
    if (pwOrdinal) *pwOrdinal = 0;

    if (!get_func_from_memid(This, memid) && !get_var_from_memid(This, memid))
    {
        hr = get_dispatch_typeinfo(&disp_typeinfo);
        if (FAILED(hr)) return hr;

        return ITypeInfo_GetDllEntry(disp_typeinfo, memid, invKind, pBstrDllName, pBstrName, pwOrdinal);
    }
    return TYPE_E_BADMODULEKIND;
}

static HRESULT WINAPI ScriptTypeInfo_GetRefTypeInfo(ITypeInfo *iface, HREFTYPE hRefType, ITypeInfo **ppTInfo)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);
    HRESULT hr;

    TRACE("(%p)->(%lx %p)\n", This, hRefType, ppTInfo);

    if (!ppTInfo || (INT)hRefType < 0) return E_INVALIDARG;

    if (hRefType & ~3) return E_FAIL;
    if (hRefType & 1)
    {
        hr = get_dispatch_typeinfo(ppTInfo);
        if (FAILED(hr)) return hr;
    }
    else
        *ppTInfo = iface;

    ITypeInfo_AddRef(*ppTInfo);
    return S_OK;
}

static HRESULT WINAPI ScriptTypeInfo_AddressOfMember(ITypeInfo *iface, MEMBERID memid, INVOKEKIND invKind, PVOID *ppv)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);
    ITypeInfo *disp_typeinfo;
    HRESULT hr;

    TRACE("(%p)->(%ld %d %p)\n", This, memid, invKind, ppv);

    if (!ppv) return E_INVALIDARG;
    *ppv = NULL;

    if (!get_func_from_memid(This, memid) && !get_var_from_memid(This, memid))
    {
        hr = get_dispatch_typeinfo(&disp_typeinfo);
        if (FAILED(hr)) return hr;

        return ITypeInfo_AddressOfMember(disp_typeinfo, memid, invKind, ppv);
    }
    return TYPE_E_BADMODULEKIND;
}

static HRESULT WINAPI ScriptTypeInfo_CreateInstance(ITypeInfo *iface, IUnknown *pUnkOuter, REFIID riid, PVOID *ppvObj)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);

    TRACE("(%p)->(%p %s %p)\n", This, pUnkOuter, debugstr_guid(riid), ppvObj);

    if (!ppvObj) return E_INVALIDARG;

    *ppvObj = NULL;
    return TYPE_E_BADMODULEKIND;
}

static HRESULT WINAPI ScriptTypeInfo_GetMops(ITypeInfo *iface, MEMBERID memid, BSTR *pBstrMops)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);
    ITypeInfo *disp_typeinfo;
    HRESULT hr;

    TRACE("(%p)->(%ld %p)\n", This, memid, pBstrMops);

    if (!pBstrMops) return E_INVALIDARG;

    if (!get_func_from_memid(This, memid) && !get_var_from_memid(This, memid))
    {
        hr = get_dispatch_typeinfo(&disp_typeinfo);
        if (FAILED(hr)) return hr;

        return ITypeInfo_GetMops(disp_typeinfo, memid, pBstrMops);
    }

    *pBstrMops = NULL;
    return S_OK;
}

static HRESULT WINAPI ScriptTypeInfo_GetContainingTypeLib(ITypeInfo *iface, ITypeLib **ppTLib, UINT *pIndex)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);

    FIXME("(%p)->(%p %p)\n", This, ppTLib, pIndex);

    return E_NOTIMPL;
}

static void WINAPI ScriptTypeInfo_ReleaseTypeAttr(ITypeInfo *iface, TYPEATTR *pTypeAttr)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);

    TRACE("(%p)->(%p)\n", This, pTypeAttr);

    free(pTypeAttr);
}

static void WINAPI ScriptTypeInfo_ReleaseFuncDesc(ITypeInfo *iface, FUNCDESC *pFuncDesc)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);

    TRACE("(%p)->(%p)\n", This, pFuncDesc);

    free(pFuncDesc);
}

static void WINAPI ScriptTypeInfo_ReleaseVarDesc(ITypeInfo *iface, VARDESC *pVarDesc)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeInfo(iface);

    TRACE("(%p)->(%p)\n", This, pVarDesc);

    free(pVarDesc);
}

static const ITypeInfoVtbl ScriptTypeInfoVtbl = {
    ScriptTypeInfo_QueryInterface,
    ScriptTypeInfo_AddRef,
    ScriptTypeInfo_Release,
    ScriptTypeInfo_GetTypeAttr,
    ScriptTypeInfo_GetTypeComp,
    ScriptTypeInfo_GetFuncDesc,
    ScriptTypeInfo_GetVarDesc,
    ScriptTypeInfo_GetNames,
    ScriptTypeInfo_GetRefTypeOfImplType,
    ScriptTypeInfo_GetImplTypeFlags,
    ScriptTypeInfo_GetIDsOfNames,
    ScriptTypeInfo_Invoke,
    ScriptTypeInfo_GetDocumentation,
    ScriptTypeInfo_GetDllEntry,
    ScriptTypeInfo_GetRefTypeInfo,
    ScriptTypeInfo_AddressOfMember,
    ScriptTypeInfo_CreateInstance,
    ScriptTypeInfo_GetMops,
    ScriptTypeInfo_GetContainingTypeLib,
    ScriptTypeInfo_ReleaseTypeAttr,
    ScriptTypeInfo_ReleaseFuncDesc,
    ScriptTypeInfo_ReleaseVarDesc
};

static HRESULT WINAPI ScriptTypeComp_QueryInterface(ITypeComp *iface, REFIID riid, void **ppv)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeComp(iface);
    return ITypeInfo_QueryInterface(&This->ITypeInfo_iface, riid, ppv);
}

static ULONG WINAPI ScriptTypeComp_AddRef(ITypeComp *iface)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeComp(iface);
    return ITypeInfo_AddRef(&This->ITypeInfo_iface);
}

static ULONG WINAPI ScriptTypeComp_Release(ITypeComp *iface)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeComp(iface);
    return ITypeInfo_Release(&This->ITypeInfo_iface);
}

static HRESULT WINAPI ScriptTypeComp_Bind(ITypeComp *iface, LPOLESTR szName, ULONG lHashVal, WORD wFlags,
        ITypeInfo **ppTInfo, DESCKIND *pDescKind, BINDPTR *pBindPtr)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeComp(iface);
    UINT flags = wFlags ? wFlags : ~0;
    ITypeInfo *disp_typeinfo;
    ITypeComp *disp_typecomp;
    HRESULT hr;
    UINT i;

    TRACE("(%p)->(%s %08lx %d %p %p %p)\n", This, debugstr_w(szName), lHashVal,
          wFlags, ppTInfo, pDescKind, pBindPtr);

    if (!szName || !ppTInfo || !pDescKind || !pBindPtr)
        return E_INVALIDARG;

    for (i = 0; i < This->num_funcs; i++)
    {
        if (wcsicmp(szName, This->funcs[i].prop->name)) continue;
        if (!(flags & INVOKE_FUNC)) return TYPE_E_TYPEMISMATCH;

        hr = ITypeInfo_GetFuncDesc(&This->ITypeInfo_iface, i, &pBindPtr->lpfuncdesc);
        if (FAILED(hr)) return hr;

        *pDescKind = DESCKIND_FUNCDESC;
        *ppTInfo = &This->ITypeInfo_iface;
        ITypeInfo_AddRef(*ppTInfo);
        return S_OK;
    }

    for (i = 0; i < This->num_vars; i++)
    {
        if (wcsicmp(szName, This->vars[i]->name)) continue;
        if (!(flags & INVOKE_PROPERTYGET)) return TYPE_E_TYPEMISMATCH;

        hr = ITypeInfo_GetVarDesc(&This->ITypeInfo_iface, i, &pBindPtr->lpvardesc);
        if (FAILED(hr)) return hr;

        *pDescKind = DESCKIND_VARDESC;
        *ppTInfo = &This->ITypeInfo_iface;
        ITypeInfo_AddRef(*ppTInfo);
        return S_OK;
    }

    /* Look into the inherited IDispatch */
    hr = get_dispatch_typeinfo(&disp_typeinfo);
    if (FAILED(hr)) return hr;

    hr = ITypeInfo_GetTypeComp(disp_typeinfo, &disp_typecomp);
    if (FAILED(hr)) return hr;

    hr = ITypeComp_Bind(disp_typecomp, szName, lHashVal, wFlags, ppTInfo, pDescKind, pBindPtr);
    ITypeComp_Release(disp_typecomp);
    return hr;
}

static HRESULT WINAPI ScriptTypeComp_BindType(ITypeComp *iface, LPOLESTR szName, ULONG lHashVal,
        ITypeInfo **ppTInfo, ITypeComp **ppTComp)
{
    ScriptTypeInfo *This = ScriptTypeInfo_from_ITypeComp(iface);
    ITypeInfo *disp_typeinfo;
    ITypeComp *disp_typecomp;
    HRESULT hr;

    TRACE("(%p)->(%s %08lx %p %p)\n", This, debugstr_w(szName), lHashVal, ppTInfo, ppTComp);

    if (!szName || !ppTInfo || !ppTComp)
        return E_INVALIDARG;

    /* Look into the inherited IDispatch */
    hr = get_dispatch_typeinfo(&disp_typeinfo);
    if (FAILED(hr)) return hr;

    hr = ITypeInfo_GetTypeComp(disp_typeinfo, &disp_typecomp);
    if (FAILED(hr)) return hr;

    hr = ITypeComp_BindType(disp_typecomp, szName, lHashVal, ppTInfo, ppTComp);
    ITypeComp_Release(disp_typecomp);
    return hr;
}

static const ITypeCompVtbl ScriptTypeCompVtbl = {
    ScriptTypeComp_QueryInterface,
    ScriptTypeComp_AddRef,
    ScriptTypeComp_Release,
    ScriptTypeComp_Bind,
    ScriptTypeComp_BindType
};

static void jsdisp_free(jsdisp_t *obj)
{
    dispex_prop_t *prop;

    list_remove(&obj->entry);

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

    if(obj->has_weak_refs) {
        struct list *list = &RB_ENTRY_VALUE(rb_get(&obj->ctx->thread_data->weak_refs, obj), struct weak_refs_entry, entry)->list;
        do {
            remove_weakmap_entry(LIST_ENTRY(list->next, struct weakmap_entry, weak_refs_entry));
        } while(obj->has_weak_refs);
    }

    for(prop = obj->props; prop < obj->props+obj->prop_cnt; prop++) {
        switch(prop->type) {
        case PROP_JSVAL:
            jsval_release(prop->u.val);
            break;
        case PROP_ACCESSOR:
            if(prop->u.accessor.getter)
                jsdisp_release(prop->u.accessor.getter);
            if(prop->u.accessor.setter)
                jsdisp_release(prop->u.accessor.setter);
            break;
        default:
            break;
        };
        free(prop->name);
    }
    free(obj->props);
    script_release(obj->ctx);
    if(obj->prototype)
        jsdisp_release(obj->prototype);

    if(obj->builtin_info->destructor)
        obj->builtin_info->destructor(obj);
    free(obj);
}

jsdisp_t *jsdisp_addref(jsdisp_t *obj)
{
    if(obj->builtin_info->addref)
        obj->builtin_info->addref(obj);
    else
        ++obj->ref;
    return obj;
}

ULONG jsdisp_release(jsdisp_t *obj)
{
    ULONG ref;

    if(obj->builtin_info->release)
        return obj->builtin_info->release(obj);

    ref = --obj->ref;
    if(!ref)
        jsdisp_free(obj);
    return ref;
}

static inline jsdisp_t *impl_from_IWineJSDispatch(IWineJSDispatch *iface)
{
    return CONTAINING_RECORD(iface, jsdisp_t, IWineJSDispatch_iface);
}

static HRESULT WINAPI DispatchEx_QueryInterface(IWineJSDispatch *iface, REFIID riid, void **ppv)
{
    jsdisp_t *This = impl_from_IWineJSDispatch(iface);

    if(IsEqualGUID(&IID_IUnknown, riid)) {
        TRACE("(%p)->(IID_IUnknown %p)\n", This, ppv);
        *ppv = &This->IWineJSDispatch_iface;
    }else if(IsEqualGUID(&IID_IDispatch, riid)) {
        TRACE("(%p)->(IID_IDispatch %p)\n", This, ppv);
        *ppv = &This->IWineJSDispatch_iface;
    }else if(IsEqualGUID(&IID_IDispatchEx, riid)) {
        TRACE("(%p)->(IID_IDispatchEx %p)\n", This, ppv);
        *ppv = &This->IWineJSDispatch_iface;
    }else if(IsEqualGUID(&IID_IWineJSDispatch, riid)) {
        TRACE("(%p)->(IID_IWineJSDispatch %p)\n", This, ppv);
        *ppv = &This->IWineJSDispatch_iface;
    }else {
        WARN("(%p)->(%s %p)\n", This, debugstr_guid(riid), ppv);
        *ppv = NULL;
        return E_NOINTERFACE;
    }

    jsdisp_addref(This);
    return S_OK;
}

static ULONG WINAPI DispatchEx_AddRef(IWineJSDispatch *iface)
{
    jsdisp_t *This = impl_from_IWineJSDispatch(iface);
    if(This->builtin_info->addref)
        return This->builtin_info->addref(This);
    jsdisp_addref(This);
    return This->ref;
}

static ULONG WINAPI DispatchEx_Release(IWineJSDispatch *iface)
{
    jsdisp_t *This = impl_from_IWineJSDispatch(iface);
    return jsdisp_release(This);
}

static HRESULT WINAPI DispatchEx_GetTypeInfoCount(IWineJSDispatch *iface, UINT *pctinfo)
{
    jsdisp_t *This = impl_from_IWineJSDispatch(iface);

    TRACE("(%p)->(%p)\n", This, pctinfo);

    *pctinfo = 1;
    return S_OK;
}

static HRESULT WINAPI DispatchEx_GetTypeInfo(IWineJSDispatch *iface, UINT iTInfo, LCID lcid,
                                              ITypeInfo **ppTInfo)
{
    jsdisp_t *This = impl_from_IWineJSDispatch(iface);
    dispex_prop_t *prop, *cur, *end, **typevar;
    UINT num_funcs = 0, num_vars = 0;
    struct typeinfo_func *typefunc;
    function_code_t *func_code;
    ScriptTypeInfo *typeinfo;
    unsigned pos;

    TRACE("(%p)->(%u %lu %p)\n", This, iTInfo, lcid, ppTInfo);

    if (iTInfo != 0) return DISP_E_BADINDEX;

    for (prop = This->props, end = prop + This->prop_cnt; prop != end; prop++)
    {
        if (prop->type != PROP_JSVAL || !(prop->flags & PROPF_ENUMERABLE))
            continue;

        /* If two identifiers differ only by case, the TypeInfo fails */
        pos = This->props[get_props_idx(This, prop->hash)].bucket_head;
        while (pos != ~0)
        {
            cur = This->props + pos;

            if (prop->hash == cur->hash && prop != cur &&
                cur->type == PROP_JSVAL && (cur->flags & PROPF_ENUMERABLE) &&
                !wcsicmp(prop->name, cur->name))
            {
                return TYPE_E_AMBIGUOUSNAME;
            }
            pos = cur->bucket_next;
        }

        if (is_function_prop(prop))
        {
            if (Function_get_code(as_jsdisp(get_object(prop->u.val))))
                num_funcs++;
        }
        else num_vars++;
    }

    if (!(typeinfo = malloc(sizeof(*typeinfo))))
        return E_OUTOFMEMORY;

    typeinfo->ITypeInfo_iface.lpVtbl = &ScriptTypeInfoVtbl;
    typeinfo->ITypeComp_iface.lpVtbl = &ScriptTypeCompVtbl;
    typeinfo->ref = 1;
    typeinfo->num_vars = num_vars;
    typeinfo->num_funcs = num_funcs;
    typeinfo->jsdisp = This;

    typeinfo->funcs = malloc(sizeof(*typeinfo->funcs) * num_funcs);
    if (!typeinfo->funcs)
    {
        free(typeinfo);
        return E_OUTOFMEMORY;
    }

    typeinfo->vars = malloc(sizeof(*typeinfo->vars) * num_vars);
    if (!typeinfo->vars)
    {
        free(typeinfo->funcs);
        free(typeinfo);
        return E_OUTOFMEMORY;
    }

    typefunc = typeinfo->funcs;
    typevar = typeinfo->vars;
    for (prop = This->props; prop != end; prop++)
    {
        if (prop->type != PROP_JSVAL || !(prop->flags & PROPF_ENUMERABLE))
            continue;

        if (is_function_prop(prop))
        {
            func_code = Function_get_code(as_jsdisp(get_object(prop->u.val)));
            if (!func_code) continue;

            typefunc->prop = prop;
            typefunc->code = func_code;
            typefunc++;

            /* The function may be deleted, so keep a ref */
            bytecode_addref(func_code->bytecode);
        }
        else
            *typevar++ = prop;
    }

    /* Keep a ref to the props and their names */
    jsdisp_addref(This);

    *ppTInfo = &typeinfo->ITypeInfo_iface;
    return S_OK;
}

static HRESULT WINAPI DispatchEx_GetIDsOfNames(IWineJSDispatch *iface, REFIID riid,
                                                LPOLESTR *rgszNames, UINT cNames, LCID lcid,
                                                DISPID *rgDispId)
{
    jsdisp_t *This = impl_from_IWineJSDispatch(iface);
    UINT i;
    HRESULT hres;

    TRACE("(%p)->(%s %p %u %lu %p)\n", This, debugstr_guid(riid), rgszNames, cNames,
          lcid, rgDispId);

    if(cNames == 0)
        return S_OK;

    hres = jsdisp_get_id(This, rgszNames[0], 0, rgDispId);
    if(FAILED(hres))
        return hres;

    /* DISPIDs for parameters don't seem to be supported */
    if(cNames > 1) {
        for(i = 1; i < cNames; i++)
            rgDispId[i] = DISPID_UNKNOWN;
        hres = DISP_E_UNKNOWNNAME;
    }

    return hres;
}

static HRESULT WINAPI DispatchEx_Invoke(IWineJSDispatch *iface, DISPID dispIdMember,
                                        REFIID riid, LCID lcid, WORD wFlags, DISPPARAMS *pDispParams,
                            VARIANT *pVarResult, EXCEPINFO *pExcepInfo, UINT *puArgErr)
{
    jsdisp_t *This = impl_from_IWineJSDispatch(iface);

    TRACE("(%p)->(%ld %s %ld %d %p %p %p %p)\n", This, dispIdMember, debugstr_guid(riid),
          lcid, wFlags, pDispParams, pVarResult, pExcepInfo, puArgErr);

    return IDispatchEx_InvokeEx(to_dispex(This), dispIdMember, lcid, wFlags,
            pDispParams, pVarResult, pExcepInfo, NULL);
}

static HRESULT WINAPI DispatchEx_GetDispID(IWineJSDispatch *iface, BSTR bstrName, DWORD grfdex, DISPID *pid)
{
    jsdisp_t *This = impl_from_IWineJSDispatch(iface);

    TRACE("(%p)->(%s %lx %p)\n", This, debugstr_w(bstrName), grfdex, pid);

    if(grfdex & ~(fdexNameCaseSensitive|fdexNameCaseInsensitive|fdexNameEnsure|fdexNameImplicit|FDEX_VERSION_MASK)) {
        FIXME("Unsupported grfdex %lx\n", grfdex);
        return E_NOTIMPL;
    }

    return jsdisp_get_id(This, bstrName, grfdex, pid);
}

static HRESULT WINAPI DispatchEx_InvokeEx(IWineJSDispatch *iface, DISPID id, LCID lcid, WORD wFlags, DISPPARAMS *pdp,
        VARIANT *pvarRes, EXCEPINFO *pei, IServiceProvider *pspCaller)
{
    jsdisp_t *This = impl_from_IWineJSDispatch(iface);
    IServiceProvider *prev_caller;
    dispex_prop_t *prop;
    jsexcept_t ei;
    HRESULT hres;

    TRACE("(%p)->(%lx %lx %x %p %p %p %p)\n", This, id, lcid, wFlags, pdp, pvarRes, pei, pspCaller);

    if(pvarRes)
        V_VT(pvarRes) = VT_EMPTY;

    prop = get_prop(This, id);
    if(!prop && id != DISPID_VALUE) {
        TRACE("invalid id\n");
        return DISP_E_MEMBERNOTFOUND;
    }

    enter_script(This->ctx, &ei);

    prev_caller = This->ctx->jscaller->caller;
    This->ctx->jscaller->caller = pspCaller;
    if(pspCaller)
        IServiceProvider_AddRef(pspCaller);

    if(wFlags == (DISPATCH_METHOD | DISPATCH_PROPERTYGET))
        wFlags = (This->ctx->version < SCRIPTLANGUAGEVERSION_ES5 || pdp->cArgs) ? DISPATCH_METHOD : DISPATCH_PROPERTYGET;

    switch(wFlags) {
    case DISPATCH_METHOD:
    case DISPATCH_CONSTRUCT: {
        jsval_t *argv, buf[6], r;
        IDispatch *passed_this;
        unsigned argc;

        hres = convert_params(This->ctx, pdp, buf, &argc, &argv);
        if(FAILED(hres))
            break;

        passed_this = get_this(pdp);
        if(prop)
            hres = invoke_prop_func(This, passed_this, prop, wFlags, argc, argv, pvarRes ? &r : NULL, pspCaller);
        else
            hres = jsdisp_call_value(This, passed_this ? jsval_disp(passed_this) : jsval_undefined(), wFlags, argc, argv, pvarRes ? &r : NULL);

        while(argc--)
            jsval_release(argv[argc]);
        if(argv != buf)
            free(argv);
        if(SUCCEEDED(hres) && pvarRes) {
            hres = jsval_to_variant(r, pvarRes);
            jsval_release(r);
        }
        break;
    }
    case DISPATCH_PROPERTYGET: {
        jsval_t r;

        if(prop)
            hres = prop_get(This, to_disp(This), prop, &r);
        else {
            hres = to_primitive(This->ctx, jsval_obj(This), &r, NO_HINT);
            if(hres == JS_E_TO_PRIMITIVE)
                hres = DISP_E_MEMBERNOTFOUND;
        }

        if(SUCCEEDED(hres)) {
            hres = jsval_to_variant(r, pvarRes);
            jsval_release(r);
        }
        break;
    }
    case DISPATCH_PROPERTYPUTREF | DISPATCH_PROPERTYPUT:
    case DISPATCH_PROPERTYPUTREF:
    case DISPATCH_PROPERTYPUT: {
        jsval_t val;
        DWORD i;

        if(!prop) {
            hres = DISP_E_MEMBERNOTFOUND;
            break;
        }

        for(i=0; i < pdp->cNamedArgs; i++) {
            if(pdp->rgdispidNamedArgs[i] == DISPID_PROPERTYPUT)
                break;
        }

        if(i == pdp->cNamedArgs) {
            TRACE("no value to set\n");
            hres = DISP_E_PARAMNOTOPTIONAL;
            break;
        }

        hres = variant_to_jsval(This->ctx, pdp->rgvarg+i, &val);
        if(FAILED(hres))
            break;

        hres = prop_put(This, prop, val);
        jsval_release(val);
        break;
    }
    default:
        FIXME("Unimplemented flags %x\n", wFlags);
        hres = E_INVALIDARG;
        break;
    }

    This->ctx->jscaller->caller = prev_caller;
    if(pspCaller)
        IServiceProvider_Release(pspCaller);
    return leave_script(This->ctx, hres);
}

static HRESULT delete_prop(jsdisp_t *obj, dispex_prop_t *prop, BOOL *ret)
{
    if(prop->type == PROP_PROTREF || prop->type == PROP_DELETED) {
        *ret = TRUE;
        return S_OK;
    }

    if(!(prop->flags & PROPF_CONFIGURABLE)) {
        *ret = FALSE;
        return S_OK;
    }

    *ret = TRUE;

    switch(prop->type) {
    case PROP_JSVAL:
        jsval_release(prop->u.val);
        break;
    case PROP_ACCESSOR:
        if(prop->u.accessor.getter)
            jsdisp_release(prop->u.accessor.getter);
        if(prop->u.accessor.setter)
            jsdisp_release(prop->u.accessor.setter);
        break;
    case PROP_EXTERN:
        if(obj->builtin_info->prop_delete) {
            HRESULT hres;
            hres = obj->builtin_info->prop_delete(obj, prop->u.id);
            if(FAILED(hres))
                return hres;
        }
        break;
    default:
        break;
    }
    prop->type = PROP_DELETED;
    return S_OK;
}

static HRESULT WINAPI DispatchEx_DeleteMemberByName(IWineJSDispatch *iface, BSTR bstrName, DWORD grfdex)
{
    jsdisp_t *This = impl_from_IWineJSDispatch(iface);
    dispex_prop_t *prop;
    BOOL b;
    HRESULT hres;

    TRACE("(%p)->(%s %lx)\n", This, debugstr_w(bstrName), grfdex);

    if(grfdex & ~(fdexNameCaseSensitive|fdexNameCaseInsensitive|fdexNameEnsure|fdexNameImplicit|FDEX_VERSION_MASK))
        FIXME("Unsupported grfdex %lx\n", grfdex);

    hres = find_prop_name(This, string_hash(bstrName), bstrName, grfdex & fdexNameCaseInsensitive, NULL, &prop);
    if(FAILED(hres))
        return hres;
    if(!prop) {
        TRACE("not found\n");
        return S_OK;
    }

    return delete_prop(This, prop, &b);
}

static HRESULT WINAPI DispatchEx_DeleteMemberByDispID(IWineJSDispatch *iface, DISPID id)
{
    jsdisp_t *This = impl_from_IWineJSDispatch(iface);
    dispex_prop_t *prop;
    BOOL b;

    TRACE("(%p)->(%lx)\n", This, id);

    prop = get_prop(This, id);
    if(!prop) {
        WARN("invalid id\n");
        return DISP_E_MEMBERNOTFOUND;
    }

    return delete_prop(This, prop, &b);
}

static HRESULT WINAPI DispatchEx_GetMemberProperties(IWineJSDispatch *iface, DISPID id, DWORD grfdexFetch, DWORD *pgrfdex)
{
    jsdisp_t *This = impl_from_IWineJSDispatch(iface);
    dispex_prop_t *prop;

    TRACE("(%p)->(%lx %lx %p)\n", This, id, grfdexFetch, pgrfdex);

    prop = get_prop(This, id);
    if(!prop)
        return DISP_E_MEMBERNOTFOUND;
    *pgrfdex = 0;

    if(grfdexFetch) {
        FIXME("unimplemented flags %08lx\n", grfdexFetch);
        return E_NOTIMPL;
    }

    return S_OK;
}

static HRESULT WINAPI DispatchEx_GetMemberName(IWineJSDispatch *iface, DISPID id, BSTR *pbstrName)
{
    jsdisp_t *This = impl_from_IWineJSDispatch(iface);
    dispex_prop_t *prop;

    TRACE("(%p)->(%lx %p)\n", This, id, pbstrName);

    prop = get_prop(This, id);
    if(!prop)
        return DISP_E_MEMBERNOTFOUND;

    *pbstrName = SysAllocString(prop->name);
    if(!*pbstrName)
        return E_OUTOFMEMORY;

    return S_OK;
}

static HRESULT WINAPI DispatchEx_GetNextDispID(IWineJSDispatch *iface, DWORD grfdex, DISPID id, DISPID *pid)
{
    jsdisp_t *This = impl_from_IWineJSDispatch(iface);
    HRESULT hres = S_FALSE;

    TRACE("(%p)->(%lx %lx %p)\n", This, grfdex, id, pid);

    if(id != DISPID_VALUE)
        hres = jsdisp_next_prop(This, id, JSDISP_ENUM_ALL, pid);
    if(hres == S_FALSE)
        *pid = DISPID_STARTENUM;
    return hres;
}

static HRESULT WINAPI DispatchEx_GetNameSpaceParent(IWineJSDispatch *iface, IUnknown **ppunk)
{
    jsdisp_t *This = impl_from_IWineJSDispatch(iface);
    FIXME("(%p)->(%p)\n", This, ppunk);
    return E_NOTIMPL;
}

static void WINAPI WineJSDispatch_Free(IWineJSDispatch *iface)
{
   jsdisp_t *This = impl_from_IWineJSDispatch(iface);
   jsdisp_free(This);
}

static HRESULT WINAPI WineJSDispatch_GetPropertyFlags(IWineJSDispatch *iface, DISPID id, UINT32 *ret)
{
    jsdisp_t *This = impl_from_IWineJSDispatch(iface);
    dispex_prop_t *prop = get_prop(This, id);

    if(!prop || prop->type == PROP_DELETED || prop->type == PROP_PROTREF)
        return DISP_E_MEMBERNOTFOUND;

    *ret = prop->flags & PROPF_PUBLIC_MASK;
    return S_OK;
}

static HRESULT WINAPI WineJSDispatch_DefineProperty(IWineJSDispatch *iface, const WCHAR *name, unsigned flags, VARIANT *v)
{
    jsdisp_t *This = impl_from_IWineJSDispatch(iface);
    HRESULT hres;
    jsval_t val;

    hres = variant_to_jsval(This->ctx, v, &val);
    if(FAILED(hres))
        return hres;

    hres = jsdisp_define_data_property(This, name, flags, val);
    jsval_release(val);
    return hres;
}

static HRESULT WINAPI WineJSDispatch_UpdateProperty(IWineJSDispatch *iface, struct property_info *desc)
{
    jsdisp_t *This = impl_from_IWineJSDispatch(iface);
    const WCHAR *name = desc->name;
    dispex_prop_t *prop;
    HRESULT hres = S_OK;
    WCHAR buf[12];

    if(!name) {
        swprintf(buf, ARRAYSIZE(buf), L"%u", desc->index);
        name = buf;
    }

    if(!(prop = lookup_dispex_prop(This, string_hash(name), name, FALSE)))
        hres = update_external_prop(This, name, NULL, desc, &prop);

    return hres;
}

static HRESULT WINAPI WineJSDispatch_GetScriptGlobal(IWineJSDispatch *iface, IWineJSDispatchHost **ret)
{
   jsdisp_t *This = impl_from_IWineJSDispatch(iface);
   IDispatch *disp;

   if(!This->ctx->site)
       return E_UNEXPECTED;

   if(!(disp = lookup_global_host(This->ctx)))
       return E_NOINTERFACE;

   *ret = get_host_dispatch(disp);
   return S_OK;
}

static HRESULT WINAPI WineJSDispatch_GetRandomValues(IWineJSDispatch *iface)
{
    jsdisp_t *This = impl_from_IWineJSDispatch(iface);

    return typed_array_get_random_values(This);
}

static IWineJSDispatchVtbl DispatchExVtbl = {
    DispatchEx_QueryInterface,
    DispatchEx_AddRef,
    DispatchEx_Release,
    DispatchEx_GetTypeInfoCount,
    DispatchEx_GetTypeInfo,
    DispatchEx_GetIDsOfNames,
    DispatchEx_Invoke,
    DispatchEx_GetDispID,
    DispatchEx_InvokeEx,
    DispatchEx_DeleteMemberByName,
    DispatchEx_DeleteMemberByDispID,
    DispatchEx_GetMemberProperties,
    DispatchEx_GetMemberName,
    DispatchEx_GetNextDispID,
    DispatchEx_GetNameSpaceParent,
    WineJSDispatch_Free,
    WineJSDispatch_GetPropertyFlags,
    WineJSDispatch_DefineProperty,
    WineJSDispatch_UpdateProperty,
    WineJSDispatch_GetScriptGlobal,
    WineJSDispatch_GetRandomValues,
};

jsdisp_t *as_jsdisp(IDispatch *disp)
{
    assert(disp->lpVtbl == (IDispatchVtbl*)&DispatchExVtbl);
    return impl_from_IWineJSDispatch((IWineJSDispatch*)disp);
}

jsdisp_t *to_jsdisp(IDispatch *disp)
{
    if(disp->lpVtbl != (IDispatchVtbl*)&DispatchExVtbl)
        return NULL;
    return impl_from_IWineJSDispatch((IWineJSDispatch*)disp);
}

HRESULT init_dispex(jsdisp_t *dispex, script_ctx_t *ctx, const builtin_info_t *builtin_info, jsdisp_t *prototype)
{
    unsigned i;

    /* FIXME: Use better heuristics to decide when to run the GC */
    if(GetTickCount() - ctx->thread_data->gc_last_tick > 30000)
        gc_run(ctx);

    TRACE("%p (%p)\n", dispex, prototype);

    dispex->IWineJSDispatch_iface.lpVtbl = &DispatchExVtbl;
    dispex->ref = 1;
    dispex->builtin_info = builtin_info;
    dispex->extensible = TRUE;
    dispex->is_constructor = builtin_info->class == JSCLASS_FUNCTION;
    dispex->prop_cnt = 0;

    dispex->props = calloc(1, sizeof(dispex_prop_t)*(dispex->buf_size=4));
    if(!dispex->props)
        return E_OUTOFMEMORY;

    for(i = 0; i < dispex->buf_size; i++) {
        dispex->props[i].bucket_head = ~0;
        dispex->props[i].bucket_next = ~0;
    }

    dispex->prototype = prototype;
    if(prototype)
        jsdisp_addref(prototype);

    script_addref(ctx);
    dispex->ctx = ctx;

    list_add_tail(&ctx->thread_data->objects, &dispex->entry);
    return S_OK;
}

static const builtin_info_t dispex_info = { .class = JSCLASS_NONE };

HRESULT create_dispex(script_ctx_t *ctx, const builtin_info_t *builtin_info, jsdisp_t *prototype, jsdisp_t **dispex)
{
    jsdisp_t *ret;
    HRESULT hres;

    ret = calloc(1, sizeof(jsdisp_t));
    if(!ret)
        return E_OUTOFMEMORY;

    hres = init_dispex(ret, ctx, builtin_info ? builtin_info : &dispex_info, prototype);
    if(FAILED(hres)) {
        free(ret);
        return hres;
    }

    *dispex = ret;
    return S_OK;
}

HRESULT init_dispex_from_constr(jsdisp_t *dispex, script_ctx_t *ctx, const builtin_info_t *builtin_info, jsdisp_t *constr)
{
    jsdisp_t *prot = NULL;
    dispex_prop_t *prop;
    HRESULT hres;

    hres = find_prop_name_prot(constr, string_hash(L"prototype"), L"prototype", FALSE, NULL, &prop);
    if(SUCCEEDED(hres) && prop && prop->type!=PROP_DELETED) {
        jsval_t val;

        hres = prop_get(constr, to_disp(constr), prop, &val);
        if(FAILED(hres)) {
            ERR("Could not get prototype\n");
            return hres;
        }

        if(is_object_instance(val))
            prot = iface_to_jsdisp(get_object(val));
        else
            prot = jsdisp_addref(ctx->object_prototype);

        jsval_release(val);
    }

    hres = init_dispex(dispex, ctx, builtin_info, prot);

    if(prot)
        jsdisp_release(prot);
    return hres;
}

jsdisp_t *iface_to_jsdisp(IDispatch *iface)
{
    return iface->lpVtbl == (const IDispatchVtbl*)&DispatchExVtbl
        ? jsdisp_addref( impl_from_IWineJSDispatch((IWineJSDispatch*)iface))
        : NULL;
}

HRESULT jsdisp_get_id(jsdisp_t *jsdisp, const WCHAR *name, DWORD flags, DISPID *id)
{
    dispex_prop_t *prop;
    HRESULT hres;

    if(jsdisp->extensible && (flags & fdexNameEnsure))
        hres = ensure_prop_name(jsdisp, name, PROPF_ENUMERABLE | PROPF_CONFIGURABLE | PROPF_WRITABLE,
                                flags & fdexNameCaseInsensitive, &prop);
    else
        hres = find_prop_name_prot(jsdisp, string_hash(name), name, flags & fdexNameCaseInsensitive, NULL, &prop);
    if(FAILED(hres))
        return hres;

    if(prop && prop->type!=PROP_DELETED) {
        *id = prop_to_id(jsdisp, prop);
        return S_OK;
    }

    TRACE("not found %s\n", debugstr_w(name));
    *id = DISPID_UNKNOWN;
    return DISP_E_UNKNOWNNAME;
}

HRESULT jsdisp_get_idx_id(jsdisp_t *jsdisp, DWORD idx, DISPID *id)
{
    WCHAR name[11];

    swprintf(name, ARRAY_SIZE(name), L"%u", idx);
    return jsdisp_get_id(jsdisp, name, 0, id);
}

HRESULT jsdisp_call_value(jsdisp_t *jsfunc, jsval_t vthis, WORD flags, unsigned argc, jsval_t *argv, jsval_t *r)
{
    HRESULT hres;

    assert(!(flags & ~(DISPATCH_METHOD|DISPATCH_CONSTRUCT|DISPATCH_JSCRIPT_INTERNAL_MASK)));

    if(is_class(jsfunc, JSCLASS_FUNCTION)) {
        hres = Function_invoke(jsfunc, vthis, flags, argc, argv, r);
    }else {
        if(!jsfunc->builtin_info->call) {
            WARN("Not a function\n");
            return JS_E_FUNCTION_EXPECTED;
        }

        if(jsfunc->ctx->state == SCRIPTSTATE_UNINITIALIZED || jsfunc->ctx->state == SCRIPTSTATE_CLOSED)
            return E_UNEXPECTED;

        flags &= ~DISPATCH_JSCRIPT_INTERNAL_MASK;
        hres = jsfunc->builtin_info->call(jsfunc->ctx, vthis, flags, argc, argv, r);
    }
    return hres;
}

HRESULT jsdisp_call(jsdisp_t *disp, DISPID id, WORD flags, unsigned argc, jsval_t *argv, jsval_t *r)
{
    dispex_prop_t *prop;

    prop = get_prop(disp, id);
    if(!prop)
        return DISP_E_MEMBERNOTFOUND;

    return invoke_prop_func(disp, to_disp(disp), prop, flags, argc, argv, r, &disp->ctx->jscaller->IServiceProvider_iface);
}

HRESULT jsdisp_call_name(jsdisp_t *disp, const WCHAR *name, WORD flags, unsigned argc, jsval_t *argv, jsval_t *r)
{
    dispex_prop_t *prop;
    HRESULT hres;

    hres = find_prop_name_prot(disp, string_hash(name), name, FALSE, NULL, &prop);
    if(FAILED(hres))
        return hres;

    if(!prop || prop->type == PROP_DELETED)
        return JS_E_INVALID_PROPERTY;

    return invoke_prop_func(disp, to_disp(disp), prop, flags, argc, argv, r, &disp->ctx->jscaller->IServiceProvider_iface);
}

static HRESULT disp_invoke(script_ctx_t *ctx, IDispatch *disp, DISPID id, WORD flags, DISPPARAMS *params, VARIANT *r,
        IServiceProvider *caller)
{
    IDispatchEx *dispex;
    EXCEPINFO ei;
    HRESULT hres;

    memset(&ei, 0, sizeof(ei));
    hres = IDispatch_QueryInterface(disp, &IID_IDispatchEx, (void**)&dispex);
    if(SUCCEEDED(hres)) {
        hres = IDispatchEx_InvokeEx(dispex, id, ctx->lcid, flags, params, r, &ei, caller);
        IDispatchEx_Release(dispex);
    }else {
        UINT err = 0;

        if(flags == DISPATCH_CONSTRUCT) {
            WARN("IDispatch cannot be constructor\n");
            return DISP_E_MEMBERNOTFOUND;
        }

        if(params->cNamedArgs == 1 && params->rgdispidNamedArgs[0] == DISPID_THIS) {
            params->cNamedArgs = 0;
            params->rgdispidNamedArgs = NULL;
            params->cArgs--;
            params->rgvarg++;
        }

        TRACE("using IDispatch\n");
        hres = IDispatch_Invoke(disp, id, &IID_NULL, ctx->lcid, flags, params, r, &ei, &err);
    }

    if(hres == DISP_E_EXCEPTION)
        handle_dispatch_exception(ctx, &ei);
    return hres;
}

HRESULT disp_call(script_ctx_t *ctx, IDispatch *disp, DISPID id, WORD flags, unsigned argc, jsval_t *argv, jsval_t *ret)
{
    VARIANT buf[6], retv;
    jsdisp_t *jsdisp;
    DISPPARAMS dp;
    unsigned i;
    HRESULT hres;

    jsdisp = iface_to_jsdisp(disp);
    if(jsdisp && jsdisp->ctx == ctx) {
        if(flags & DISPATCH_PROPERTYPUT) {
            FIXME("disp_call(propput) on builtin object\n");
            jsdisp_release(jsdisp);
            return E_FAIL;
        }

        if(ctx != jsdisp->ctx)
            flags &= ~DISPATCH_JSCRIPT_INTERNAL_MASK;
        hres = jsdisp_call(jsdisp, id, flags, argc, argv, ret);
        jsdisp_release(jsdisp);
        return hres;
    }
    if(jsdisp)
        jsdisp_release(jsdisp);

    flags &= ~DISPATCH_JSCRIPT_INTERNAL_MASK;
    if(ret && argc && (!jsdisp || ctx->version < SCRIPTLANGUAGEVERSION_ES5))
        flags |= DISPATCH_PROPERTYGET;

    dp.cArgs = argc;

    if(flags & DISPATCH_PROPERTYPUT) {
        static DISPID propput_dispid = DISPID_PROPERTYPUT;

        dp.cNamedArgs = 1;
        dp.rgdispidNamedArgs = &propput_dispid;
    }else {
        dp.cNamedArgs = 0;
        dp.rgdispidNamedArgs = NULL;
    }

    if(dp.cArgs > ARRAY_SIZE(buf)) {
        dp.rgvarg = malloc(argc * sizeof(VARIANT));
        if(!dp.rgvarg)
            return E_OUTOFMEMORY;
    }else {
        dp.rgvarg = buf;
    }

    for(i=0; i<argc; i++) {
        hres = jsval_to_variant(argv[i], dp.rgvarg+argc-i-1);
        if(FAILED(hres)) {
            while(i--)
                VariantClear(dp.rgvarg+argc-i-1);
            if(dp.rgvarg != buf)
                free(dp.rgvarg);
            return hres;
        }
    }

    V_VT(&retv) = VT_EMPTY;
    hres = disp_invoke(ctx, disp, id, flags, &dp, ret ? &retv : NULL, &ctx->jscaller->IServiceProvider_iface);

    for(i=0; i<argc; i++)
        VariantClear(dp.rgvarg+argc-i-1);
    if(dp.rgvarg != buf)
        free(dp.rgvarg);

    if(SUCCEEDED(hres) && ret)
        hres = variant_to_jsval(ctx, &retv, ret);
    VariantClear(&retv);
    return hres;
}

HRESULT disp_call_name(script_ctx_t *ctx, IDispatch *disp, const WCHAR *name, WORD flags, unsigned argc, jsval_t *argv, jsval_t *ret)
{
    IDispatchEx *dispex;
    jsdisp_t *jsdisp;
    HRESULT hres;
    DISPID id;
    BSTR bstr;

    if((jsdisp = to_jsdisp(disp)) && jsdisp->ctx == ctx)
        return jsdisp_call_name(jsdisp, name, flags, argc, argv, ret);

    if(!(bstr = SysAllocString(name)))
        return E_OUTOFMEMORY;
    hres = IDispatch_QueryInterface(disp, &IID_IDispatchEx, (void**)&dispex);
    if(SUCCEEDED(hres) && dispex) {
        hres = IDispatchEx_GetDispID(dispex, bstr, make_grfdex(ctx, fdexNameCaseSensitive), &id);
        IDispatchEx_Release(dispex);
    }else {
        hres = IDispatch_GetIDsOfNames(disp, &IID_NULL, &bstr, 1, 0, &id);
    }
    SysFreeString(bstr);
    if(FAILED(hres))
        return hres;

    return disp_call(ctx, disp, id, flags, argc, argv, ret);
}

HRESULT disp_call_value_with_caller(script_ctx_t *ctx, IDispatch *disp, jsval_t vthis, WORD flags, unsigned argc,
        jsval_t *argv, jsval_t *r, IServiceProvider *caller)
{
    VARIANT buf[6], retv, *args = buf;
    IDispatch *jsthis;
    jsdisp_t *jsdisp;
    DISPPARAMS dp;
    unsigned i;
    HRESULT hres = S_OK;

    static DISPID this_id = DISPID_THIS;

    assert(!(flags & ~(DISPATCH_METHOD|DISPATCH_CONSTRUCT|DISPATCH_JSCRIPT_INTERNAL_MASK)));

    jsdisp = iface_to_jsdisp(disp);
    if(jsdisp && jsdisp->ctx == ctx) {
        hres = jsdisp_call_value(jsdisp, vthis, flags, argc, argv, r);
        jsdisp_release(jsdisp);
        return hres;
    }
    if(jsdisp)
        jsdisp_release(jsdisp);

    if(is_object_instance(vthis) && (ctx->version < SCRIPTLANGUAGEVERSION_ES5 ||
       ((jsdisp = to_jsdisp(get_object(vthis))) && is_class(jsdisp, JSCLASS_OBJECT))))
        jsthis = get_object(vthis);
    else
        jsthis = NULL;

    flags &= ~DISPATCH_JSCRIPT_INTERNAL_MASK;
    if(r && argc && flags == DISPATCH_METHOD)
        flags |= DISPATCH_PROPERTYGET;

    if(jsthis) {
        dp.cArgs = argc + 1;
        dp.cNamedArgs = 1;
        dp.rgdispidNamedArgs = &this_id;
    }else {
        dp.cArgs = argc;
        dp.cNamedArgs = 0;
        dp.rgdispidNamedArgs = NULL;
    }

    if(dp.cArgs > ARRAY_SIZE(buf) && !(args = malloc(dp.cArgs * sizeof(VARIANT))))
        return E_OUTOFMEMORY;
    dp.rgvarg = args;

    if(jsthis) {
        V_VT(dp.rgvarg) = VT_DISPATCH;
        V_DISPATCH(dp.rgvarg) = jsthis;
    }

    for(i=0; SUCCEEDED(hres) && i < argc; i++)
        hres = jsval_to_variant(argv[i], dp.rgvarg+dp.cArgs-i-1);

    if(SUCCEEDED(hres)) {
        V_VT(&retv) = VT_EMPTY;
        hres = disp_invoke(ctx, disp, DISPID_VALUE, flags, &dp, r ? &retv : NULL, caller);
    }

    for(i = 0; i < argc; i++)
        VariantClear(dp.rgvarg + dp.cArgs - i - 1);
    if(args != buf)
        free(args);

    if(FAILED(hres))
        return hres;
    if(!r)
        return S_OK;

    hres = variant_to_jsval(ctx, &retv, r);
    VariantClear(&retv);
    return hres;
}

HRESULT jsdisp_propput(jsdisp_t *obj, const WCHAR *name, DWORD flags, BOOL throw, jsval_t val)
{
    dispex_prop_t *prop;
    HRESULT hres;

    if(obj->extensible)
        hres = ensure_prop_name(obj, name, flags, FALSE, &prop);
    else
        hres = find_prop_name(obj, string_hash(name), name, FALSE, NULL, &prop);
    if(FAILED(hres))
        return hres;
    if(!prop || (prop->type == PROP_DELETED && !obj->extensible))
        return throw ? JS_E_INVALID_ACTION : S_OK;

    return prop_put(obj, prop, val);
}

HRESULT jsdisp_propput_name(jsdisp_t *obj, const WCHAR *name, jsval_t val)
{
    return jsdisp_propput(obj, name, PROPF_ENUMERABLE | PROPF_CONFIGURABLE | PROPF_WRITABLE, FALSE, val);
}

HRESULT jsdisp_propput_idx(jsdisp_t *obj, DWORD idx, jsval_t val)
{
    WCHAR buf[12];

    swprintf(buf, ARRAY_SIZE(buf), L"%d", idx);
    return jsdisp_propput(obj, buf, PROPF_ENUMERABLE | PROPF_CONFIGURABLE | PROPF_WRITABLE, TRUE, val);
}

HRESULT disp_propput(script_ctx_t *ctx, IDispatch *disp, DISPID id, jsval_t val)
{
    jsdisp_t *jsdisp;
    HRESULT hres;

    jsdisp = iface_to_jsdisp(disp);
    if(jsdisp && jsdisp->ctx == ctx) {
        dispex_prop_t *prop;

        prop = get_prop(jsdisp, id);
        if(prop)
            hres = prop_put(jsdisp, prop, val);
        else
            hres = DISP_E_MEMBERNOTFOUND;

        jsdisp_release(jsdisp);
    }else {
        DISPID dispid = DISPID_PROPERTYPUT;
        DWORD flags = DISPATCH_PROPERTYPUT;
        VARIANT var;
        DISPPARAMS dp  = {&var, &dispid, 1, 1};

        if(jsdisp)
            jsdisp_release(jsdisp);
        hres = jsval_to_variant(val, &var);
        if(FAILED(hres))
            return hres;

        if(V_VT(&var) == VT_DISPATCH)
            flags |= DISPATCH_PROPERTYPUTREF;

        hres = disp_invoke(ctx, disp, id, flags, &dp, NULL, &ctx->jscaller->IServiceProvider_iface);
        VariantClear(&var);
    }

    return hres;
}

HRESULT disp_propput_name(script_ctx_t *ctx, IDispatch *disp, const WCHAR *name, jsval_t val)
{
    jsdisp_t *jsdisp;
    HRESULT hres;

    jsdisp = iface_to_jsdisp(disp);
    if(!jsdisp || jsdisp->ctx != ctx) {
        IDispatchEx *dispex;
        BSTR str;
        DISPID id;

        if(jsdisp)
            jsdisp_release(jsdisp);
        if(!(str = SysAllocString(name)))
            return E_OUTOFMEMORY;

        hres = IDispatch_QueryInterface(disp, &IID_IDispatchEx, (void**)&dispex);
        if(SUCCEEDED(hres)) {
            hres = IDispatchEx_GetDispID(dispex, str, make_grfdex(ctx, fdexNameEnsure|fdexNameCaseSensitive), &id);
            IDispatchEx_Release(dispex);
        }else {
            TRACE("using IDispatch\n");
            hres = IDispatch_GetIDsOfNames(disp, &IID_NULL, &str, 1, 0, &id);
        }
        SysFreeString(str);
        if(FAILED(hres))
            return hres;

        return disp_propput(ctx, disp, id, val);
    }

    hres = jsdisp_propput_name(jsdisp, name, val);
    jsdisp_release(jsdisp);
    return hres;
}

HRESULT jsdisp_propget_name(jsdisp_t *obj, const WCHAR *name, jsval_t *val)
{
    dispex_prop_t *prop;
    HRESULT hres;

    hres = find_prop_name_prot(obj, string_hash(name), name, FALSE, NULL, &prop);
    if(FAILED(hres))
        return hres;

    if(!prop || prop->type==PROP_DELETED) {
        *val = jsval_undefined();
        return S_OK;
    }

    return prop_get(obj, to_disp(obj), prop, val);
}

HRESULT disp_propget_name(script_ctx_t *ctx, IDispatch *disp, const WCHAR *name, jsval_t *val)
{
    IDispatchEx *dispex;
    jsdisp_t *jsdisp;
    DISPID dispid;
    HRESULT hres;
    BSTR str;

    jsdisp = to_jsdisp(disp);
    if(jsdisp && jsdisp->ctx == ctx)
        return jsdisp_propget_name(jsdisp, name, val);

    if(!(str = SysAllocString(name)))
        return E_OUTOFMEMORY;
    hres = IDispatch_QueryInterface(disp, &IID_IDispatchEx, (void**)&dispex);
    if(hres != S_OK)
        hres = IDispatch_GetIDsOfNames(disp, &IID_NULL, &str, 1, 0, &dispid);
    else {
        hres = IDispatchEx_GetDispID(dispex, str, fdexNameCaseSensitive, &dispid);
        IDispatchEx_Release(dispex);
    }
    SysFreeString(str);

    if(SUCCEEDED(hres))
        hres = disp_propget(ctx, disp, dispid, val);

    return hres;
}

HRESULT jsdisp_get_idx(jsdisp_t *obj, DWORD idx, jsval_t *r)
{
    WCHAR name[12];
    dispex_prop_t *prop;
    HRESULT hres;

    swprintf(name, ARRAY_SIZE(name), L"%d", idx);

    hres = find_prop_name_prot(obj, string_hash(name), name, FALSE, NULL, &prop);
    if(FAILED(hres))
        return hres;

    if(!prop || prop->type==PROP_DELETED) {
        *r = jsval_undefined();
        return DISP_E_UNKNOWNNAME;
    }

    return prop_get(obj, to_disp(obj), prop, r);
}

HRESULT disp_propget_idx(script_ctx_t *ctx, IDispatch *disp, DWORD idx, jsval_t *r)
{
    WCHAR buf[12];

    swprintf(buf, ARRAY_SIZE(buf), L"%u", idx);
    return disp_propget_name(ctx, disp, buf, r);
}

HRESULT jsdisp_propget(jsdisp_t *jsdisp, DISPID id, jsval_t *val)
{
    dispex_prop_t *prop;

    prop = get_prop(jsdisp, id);
    if(!prop)
        return DISP_E_MEMBERNOTFOUND;

    return prop_get(jsdisp, to_disp(jsdisp), prop, val);
}

HRESULT disp_propget(script_ctx_t *ctx, IDispatch *disp, DISPID id, jsval_t *val)
{
    DISPPARAMS dp  = {NULL,NULL,0,0};
    jsdisp_t *jsdisp;
    VARIANT var;
    HRESULT hres;

    jsdisp = iface_to_jsdisp(disp);
    if(jsdisp && jsdisp->ctx == ctx) {
        hres = jsdisp_propget(jsdisp, id, val);
        jsdisp_release(jsdisp);
        return hres;
    }
    if(jsdisp)
        jsdisp_release(jsdisp);

    V_VT(&var) = VT_EMPTY;
    hres = disp_invoke(ctx, disp, id, INVOKE_PROPERTYGET, &dp, &var, &ctx->jscaller->IServiceProvider_iface);
    if(SUCCEEDED(hres)) {
        hres = variant_to_jsval(ctx, &var, val);
        VariantClear(&var);
    }
    return hres;
}

HRESULT jsdisp_delete_idx(jsdisp_t *obj, DWORD idx)
{
    WCHAR buf[12];
    dispex_prop_t *prop;
    BOOL b;
    HRESULT hres;

    swprintf(buf, ARRAY_SIZE(buf), L"%d", idx);

    hres = find_prop_name(obj, string_hash(buf), buf, FALSE, NULL, &prop);
    if(FAILED(hres) || !prop)
        return hres;

    hres = delete_prop(obj, prop, &b);
    if(FAILED(hres))
        return hres;
    return b ? S_OK : JS_E_INVALID_ACTION;
}

HRESULT disp_delete(IDispatch *disp, DISPID id, BOOL *ret)
{
    IDispatchEx *dispex;
    jsdisp_t *jsdisp;
    HRESULT hres;

    jsdisp = iface_to_jsdisp(disp);
    if(jsdisp) {
        dispex_prop_t *prop;

        prop = get_prop(jsdisp, id);
        if(prop)
            hres = delete_prop(jsdisp, prop, ret);
        else
            hres = DISP_E_MEMBERNOTFOUND;

        jsdisp_release(jsdisp);
        return hres;
    }

    hres = IDispatch_QueryInterface(disp, &IID_IDispatchEx, (void**)&dispex);
    if(FAILED(hres)) {
        *ret = FALSE;
        return S_OK;
    }

    hres = IDispatchEx_DeleteMemberByDispID(dispex, id);
    IDispatchEx_Release(dispex);
    if(FAILED(hres))
        return hres;

    *ret = hres == S_OK;
    return S_OK;
}

HRESULT jsdisp_fill_indices(jsdisp_t *obj, unsigned length)
{
    struct property_info desc;
    HRESULT hres;

    desc.flags = PROPF_ENUMERABLE;
    if(obj->builtin_info->prop_put)
        desc.flags |= PROPF_WRITABLE;
    desc.name = NULL;
    desc.iid = 0;

    for(desc.index = 0; desc.index < length; desc.index++) {
        desc.id = desc.index;
        hres = WineJSDispatch_UpdateProperty(&obj->IWineJSDispatch_iface, &desc);
        if(FAILED(hres))
            return hres;
    }

    return S_OK;
}

HRESULT jsdisp_next_prop(jsdisp_t *obj, DISPID id, enum jsdisp_enum_type enum_type, DISPID *ret)
{
    dispex_prop_t *iter;
    DWORD idx = id;
    HRESULT hres;

    if(id == DISPID_STARTENUM || idx >= obj->prop_cnt) {
        hres = (enum_type == JSDISP_ENUM_ALL) ? fill_protrefs(obj) : fill_props(obj);
        if(FAILED(hres))
            return hres;
        if(id == DISPID_STARTENUM)
            idx = 0;
        if(idx >= obj->prop_cnt)
            return S_FALSE;
    }

    for(iter = &obj->props[idx]; iter < obj->props + obj->prop_cnt; iter++) {
        if(iter->type == PROP_EXTERN) {
            dispex_prop_t *prop;
            hres = find_external_prop(obj, iter->name, FALSE, iter, &prop);
            if(FAILED(hres) || prop != iter)
                iter->type = PROP_DELETED;
        }
        if(iter->type == PROP_DELETED)
            continue;
        if(enum_type != JSDISP_ENUM_ALL && iter->type == PROP_PROTREF)
            continue;
        if(enum_type != JSDISP_ENUM_OWN && !is_enumerable(obj, iter))
            continue;
        *ret = prop_to_id(obj, iter);
        return S_OK;
    }

    if(obj->ctx->html_mode)
        return jsdisp_next_prop(obj, prop_to_id(obj, iter - 1), enum_type, ret);

    return S_FALSE;
}

HRESULT disp_delete_name(script_ctx_t *ctx, IDispatch *disp, jsstr_t *name, BOOL *ret)
{
    IDispatchEx *dispex;
    jsdisp_t *jsdisp;
    BSTR bstr;
    HRESULT hres;

    jsdisp = iface_to_jsdisp(disp);
    if(jsdisp) {
        dispex_prop_t *prop;
        const WCHAR *ptr;

        ptr = jsstr_flatten(name);
        if(!ptr) {
            jsdisp_release(jsdisp);
            return E_OUTOFMEMORY;
        }

        hres = find_prop_name(jsdisp, string_hash(ptr), ptr, FALSE, NULL, &prop);
        if(prop) {
            hres = delete_prop(jsdisp, prop, ret);
        }else {
            *ret = TRUE;
            hres = S_OK;
        }

        jsdisp_release(jsdisp);
        return hres;
    }

    bstr = SysAllocStringLen(NULL, jsstr_length(name));
    if(!bstr)
        return E_OUTOFMEMORY;
    jsstr_flush(name, bstr);

    hres = IDispatch_QueryInterface(disp, &IID_IDispatchEx, (void**)&dispex);
    if(SUCCEEDED(hres)) {
        hres = IDispatchEx_DeleteMemberByName(dispex, bstr, make_grfdex(ctx, fdexNameCaseSensitive));
        if(SUCCEEDED(hres))
            *ret = hres == S_OK;
        IDispatchEx_Release(dispex);
    }else {
        DISPID id;

        hres = IDispatch_GetIDsOfNames(disp, &IID_NULL, &bstr, 1, 0, &id);
        if(SUCCEEDED(hres)) {
            /* Property exists and we can't delete it from pure IDispatch interface, so return false. */
            *ret = FALSE;
        }else if(hres == DISP_E_UNKNOWNNAME) {
            /* Property doesn't exist, so nothing to delete */
            *ret = TRUE;
            hres = S_OK;
        }
    }

    SysFreeString(bstr);
    return hres;
}

HRESULT jsdisp_get_own_property(jsdisp_t *obj, const WCHAR *name, BOOL flags_only,
                                property_desc_t *desc)
{
    dispex_prop_t *prop;
    HRESULT hres;

    hres = find_prop_name(obj, string_hash(name), name, FALSE, NULL, &prop);
    if(FAILED(hres))
        return hres;

    if(!prop)
        return DISP_E_UNKNOWNNAME;

    memset(desc, 0, sizeof(*desc));

    switch(prop->type) {
    case PROP_BUILTIN:
    case PROP_JSVAL:
    case PROP_EXTERN:
        desc->mask |= PROPF_WRITABLE;
        desc->explicit_value = TRUE;
        if(!flags_only) {
            hres = prop_get(obj, to_disp(obj), prop, &desc->value);
            if(FAILED(hres))
                return hres;
        }
        break;
    case PROP_ACCESSOR:
        desc->explicit_getter = desc->explicit_setter = TRUE;
        if(!flags_only) {
            desc->getter = prop->u.accessor.getter
                ? jsdisp_addref(prop->u.accessor.getter) : NULL;
            desc->setter = prop->u.accessor.setter
                ? jsdisp_addref(prop->u.accessor.setter) : NULL;
        }
        break;
    default:
        return DISP_E_UNKNOWNNAME;
    }

    desc->flags = prop->flags & (PROPF_ENUMERABLE | PROPF_WRITABLE | PROPF_CONFIGURABLE);
    desc->mask |= PROPF_ENUMERABLE | PROPF_CONFIGURABLE;
    return S_OK;
}

HRESULT jsdisp_define_property(jsdisp_t *obj, const WCHAR *name, property_desc_t *desc)
{
    dispex_prop_t *prop;
    HRESULT hres;

    hres = find_prop_name(obj, string_hash(name), name, FALSE, NULL, &prop);
    if(FAILED(hres))
        return hres;

    if((!prop || prop->type == PROP_DELETED || prop->type == PROP_PROTREF) && !obj->extensible)
        return throw_error(obj->ctx, JS_E_OBJECT_NONEXTENSIBLE, name);

    if(!prop && !(prop = alloc_prop(obj, name, PROP_DELETED, 0)))
       return E_OUTOFMEMORY;

    if(prop->type == PROP_DELETED || prop->type == PROP_PROTREF) {
        prop->flags = desc->flags;
        if(desc->explicit_getter || desc->explicit_setter) {
            prop->type = PROP_ACCESSOR;
            prop->u.accessor.getter = desc->getter ? jsdisp_addref(desc->getter) : NULL;
            prop->u.accessor.setter = desc->setter ? jsdisp_addref(desc->setter) : NULL;
            TRACE("%s = accessor { get: %p set: %p }\n", debugstr_w(name),
                  prop->u.accessor.getter, prop->u.accessor.setter);
        }else {
            prop->type = PROP_JSVAL;
            if(desc->explicit_value) {
                hres = jsval_copy(desc->value, &prop->u.val);
                if(FAILED(hres))
                    return hres;
            }else {
                prop->u.val = jsval_undefined();
            }
            TRACE("%s = %s\n", debugstr_w(name), debugstr_jsval(prop->u.val));
        }
        return S_OK;
    }

    TRACE("existing prop %s prop flags %lx desc flags %x desc mask %x\n", debugstr_w(name),
          prop->flags, desc->flags, desc->mask);

    if(!(prop->flags & PROPF_CONFIGURABLE)) {
        if(((desc->mask & PROPF_CONFIGURABLE) && (desc->flags & PROPF_CONFIGURABLE))
           || ((desc->mask & PROPF_ENUMERABLE)
               && ((desc->flags & PROPF_ENUMERABLE) != (prop->flags & PROPF_ENUMERABLE))))
            return throw_error(obj->ctx, JS_E_NONCONFIGURABLE_REDEFINED, name);
    }

    if(desc->explicit_value || (desc->mask & PROPF_WRITABLE)) {
        if(prop->type == PROP_ACCESSOR) {
            if(!(prop->flags & PROPF_CONFIGURABLE))
                return throw_error(obj->ctx, JS_E_NONCONFIGURABLE_REDEFINED, name);
            if(prop->u.accessor.getter)
                jsdisp_release(prop->u.accessor.getter);
            if(prop->u.accessor.setter)
                jsdisp_release(prop->u.accessor.setter);

            prop->type = PROP_JSVAL;
            hres = jsval_copy(desc->value, &prop->u.val);
            if(FAILED(hres)) {
                prop->u.val = jsval_undefined();
                return hres;
            }
        }else {
            if(!(prop->flags & PROPF_CONFIGURABLE) && !(prop->flags & PROPF_WRITABLE)) {
                if((desc->mask & PROPF_WRITABLE) && (desc->flags & PROPF_WRITABLE))
                    return throw_error(obj->ctx, JS_E_NONWRITABLE_MODIFIED, name);
                if(desc->explicit_value) {
                    if(prop->type == PROP_JSVAL) {
                        BOOL eq;
                        hres = jsval_strict_equal(desc->value, prop->u.val, &eq);
                        if(FAILED(hres))
                            return hres;
                        if(!eq)
                            return throw_error(obj->ctx, JS_E_NONWRITABLE_MODIFIED, name);
                    }else {
                        FIXME("redefinition of property type %d\n", prop->type);
                    }
                }
            }
            if(desc->explicit_value) {
                if(prop->type == PROP_JSVAL)
                    jsval_release(prop->u.val);
                else {
                    if(prop->type == PROP_EXTERN && obj->builtin_info->prop_delete) {
                        hres = obj->builtin_info->prop_delete(obj, prop->u.id);
                        if(FAILED(hres))
                            return hres;
                    }
                    prop->type = PROP_JSVAL;
                }
                hres = jsval_copy(desc->value, &prop->u.val);
                if(FAILED(hres)) {
                    prop->u.val = jsval_undefined();
                    return hres;
                }
            }
        }
    }else if(desc->explicit_getter || desc->explicit_setter) {
        if(prop->type != PROP_ACCESSOR) {
            if(!(prop->flags & PROPF_CONFIGURABLE))
                return throw_error(obj->ctx, JS_E_NONCONFIGURABLE_REDEFINED, name);
            if(prop->type == PROP_JSVAL)
                jsval_release(prop->u.val);
            prop->type = PROP_ACCESSOR;
            prop->u.accessor.getter = prop->u.accessor.setter = NULL;
        }else if(!(prop->flags & PROPF_CONFIGURABLE)) {
            if((desc->explicit_getter && desc->getter != prop->u.accessor.getter)
               || (desc->explicit_setter && desc->setter != prop->u.accessor.setter))
                return throw_error(obj->ctx, JS_E_NONCONFIGURABLE_REDEFINED, name);
        }

        if(desc->explicit_getter) {
            if(prop->u.accessor.getter) {
                jsdisp_release(prop->u.accessor.getter);
                prop->u.accessor.getter = NULL;
            }
            if(desc->getter)
                prop->u.accessor.getter = jsdisp_addref(desc->getter);
        }
        if(desc->explicit_setter) {
            if(prop->u.accessor.setter) {
                jsdisp_release(prop->u.accessor.setter);
                prop->u.accessor.setter = NULL;
            }
            if(desc->setter)
                prop->u.accessor.setter = jsdisp_addref(desc->setter);
        }
    }

    prop->flags = (prop->flags & ~desc->mask) | (desc->flags & desc->mask);
    return S_OK;
}

HRESULT jsdisp_define_data_property(jsdisp_t *obj, const WCHAR *name, unsigned flags, jsval_t value)
{
    property_desc_t prop_desc = { flags, flags, TRUE };
    prop_desc.value = value;
    return jsdisp_define_property(obj, name, &prop_desc);
}

HRESULT jsdisp_change_prototype(jsdisp_t *obj, jsdisp_t *proto)
{
    jsdisp_t *iter;
    DWORD i;

    if(obj->prototype == proto)
        return S_OK;
    if(!obj->extensible)
        return JS_E_CANNOT_CREATE_FOR_NONEXTENSIBLE;

    for(iter = proto; iter; iter = iter->prototype)
        if(iter == obj)
            return JS_E_CYCLIC_PROTO_VALUE;

    if(obj->prototype) {
        for(i = 0; i < obj->prop_cnt; i++)
            if(obj->props[i].type == PROP_PROTREF)
                obj->props[i].type = PROP_DELETED;
        jsdisp_release(obj->prototype);
    }

    obj->prototype = proto;
    if(proto)
        jsdisp_addref(proto);
    return S_OK;
}

static void set_prop_flags(jsdisp_t *obj, dispex_prop_t *prop, UINT32 flags)
{
    if(prop->type == PROP_EXTERN && obj->builtin_info->prop_config) {
        HRESULT hres = obj->builtin_info->prop_config(obj, prop->u.id, flags);
        if(hres != S_OK)
            return;
    }
    prop->flags = (prop->flags & ~PROPF_PUBLIC_MASK) | flags;
}

void jsdisp_freeze(jsdisp_t *obj, BOOL seal)
{
    unsigned int i;

    fill_props(obj);
    for(i = 0; i < obj->prop_cnt; i++) {
        unsigned int mask = PROPF_CONFIGURABLE;
        if(!seal && obj->props[i].type == PROP_JSVAL)
            mask |= PROPF_WRITABLE;
        set_prop_flags(obj, &obj->props[i], obj->props[i].flags & PROPF_PUBLIC_MASK & ~mask);
    }

    obj->extensible = FALSE;
}

BOOL jsdisp_is_frozen(jsdisp_t *obj, BOOL sealed)
{
    unsigned int i;

    if(obj->extensible)
        return FALSE;
    fill_props(obj);

    for(i = 0; i < obj->prop_cnt; i++) {
        if(obj->props[i].type == PROP_JSVAL || obj->props[i].type == PROP_EXTERN) {
            if(!sealed && (obj->props[i].flags & PROPF_WRITABLE))
                return FALSE;
        }else if(obj->props[i].type != PROP_ACCESSOR)
            continue;
        if(obj->props[i].flags & PROPF_CONFIGURABLE)
            return FALSE;
    }

    return TRUE;
}

HRESULT jsdisp_get_prop_name(jsdisp_t *obj, DISPID id, jsstr_t **r)
{
    dispex_prop_t *prop = get_prop(obj, id);

    if(!prop)
        return DISP_E_MEMBERNOTFOUND;

    *r = jsstr_alloc(prop->name);
    return *r ? S_OK : E_OUTOFMEMORY;
}

typedef struct {
    jsdisp_t jsdisp;
    IWineJSDispatchHost *host_iface;
} HostObject;

static inline HostObject *HostObject_from_jsdisp(jsdisp_t *jsdisp)
{
    return CONTAINING_RECORD(jsdisp, HostObject, jsdisp);
}

static ULONG HostObject_addref(jsdisp_t *jsdisp)
{
    HostObject *This = HostObject_from_jsdisp(jsdisp);
    return IWineJSDispatchHost_AddRef(This->host_iface);
}

static ULONG HostObject_release(jsdisp_t *jsdisp)
{
    HostObject *This = HostObject_from_jsdisp(jsdisp);
    return IWineJSDispatchHost_Release(This->host_iface);
}

static HRESULT HostObject_lookup_prop(jsdisp_t *jsdisp, const WCHAR *name, unsigned  flags, struct property_info *desc)
{
    HostObject *This = HostObject_from_jsdisp(jsdisp);

    return IWineJSDispatchHost_LookupProperty(This->host_iface, name, flags, desc);
}

static HRESULT HostObject_prop_get(jsdisp_t *jsdisp, unsigned idx, jsval_t *r)
{
    HostObject *This = HostObject_from_jsdisp(jsdisp);
    EXCEPINFO ei = { 0 };
    VARIANT v;
    HRESULT hres;

    V_VT(&v) = VT_EMPTY;
    hres = IWineJSDispatchHost_GetProperty(This->host_iface, idx, jsdisp->ctx->lcid, &v, &ei,
                                           &jsdisp->ctx->jscaller->IServiceProvider_iface);
    if(hres == DISP_E_EXCEPTION)
        handle_dispatch_exception(jsdisp->ctx, &ei);
    if(FAILED(hres))
        return hres;

    hres = variant_to_jsval(jsdisp->ctx, &v, r);
    VariantClear(&v);
    return hres;
}

static HRESULT HostObject_prop_put(jsdisp_t *jsdisp, unsigned idx, jsval_t v)
{
    HostObject *This = HostObject_from_jsdisp(jsdisp);
    EXCEPINFO ei = { 0 };
    VARIANT var;
    HRESULT hres;

    hres = jsval_to_variant(v, &var);
    if(FAILED(hres))
        return hres;

    hres = IWineJSDispatchHost_SetProperty(This->host_iface, idx, jsdisp->ctx->lcid, &var, &ei,
                                           &jsdisp->ctx->jscaller->IServiceProvider_iface);
    if(hres == DISP_E_EXCEPTION)
        handle_dispatch_exception(jsdisp->ctx, &ei);
    VariantClear(&var);
    return hres;
}

static HRESULT HostObject_prop_delete(jsdisp_t *jsdisp, unsigned id)
{
    HostObject *This = HostObject_from_jsdisp(jsdisp);

    return IWineJSDispatchHost_DeleteProperty(This->host_iface, id);
}

static HRESULT HostObject_prop_config(jsdisp_t *jsdisp, unsigned id, unsigned flags)
{
    HostObject *This = HostObject_from_jsdisp(jsdisp);

    return IWineJSDispatchHost_ConfigureProperty(This->host_iface, id, flags);
}

static HRESULT HostObject_fill_props(jsdisp_t *jsdisp)
{
    HostObject *This = HostObject_from_jsdisp(jsdisp);

    return IWineJSDispatchHost_FillProperties(This->host_iface);
}

static HRESULT HostObject_to_string(jsdisp_t *jsdisp, jsstr_t **ret)
{
    HostObject *This = HostObject_from_jsdisp(jsdisp);
    BSTR str;
    HRESULT hres;

    hres = IWineJSDispatchHost_ToString(This->host_iface, &str);
    if(FAILED(hres))
        return hres;

    *ret = jsstr_alloc(str);
    SysFreeString(str);
    return *ret ? S_OK : E_OUTOFMEMORY;
}

static const builtin_info_t HostObject_info = {
    .class       = JSCLASS_HOST,
    .addref      = HostObject_addref,
    .release     = HostObject_release,
    .lookup_prop = HostObject_lookup_prop,
    .prop_get    = HostObject_prop_get,
    .prop_put    = HostObject_prop_put,
    .prop_delete = HostObject_prop_delete,
    .prop_config = HostObject_prop_config,
    .fill_props  = HostObject_fill_props,
    .to_string   = HostObject_to_string,
};

HRESULT init_host_object(script_ctx_t *ctx, IWineJSDispatchHost *host_iface, IWineJSDispatch *prototype_iface,
                         UINT32 flags, IWineJSDispatch **ret)
{
    HostObject *host_obj;
    jsdisp_t *prototype;
    HRESULT hres;

    if(!(host_obj = calloc(1, sizeof(*host_obj))))
        return E_OUTOFMEMORY;

    if(prototype_iface)
        prototype = impl_from_IWineJSDispatch(prototype_iface);
    else
        prototype = ctx->object_prototype;
    hres = init_dispex(&host_obj->jsdisp, ctx, &HostObject_info, prototype);
    if(FAILED(hres)) {
        free(host_obj);
        return hres;
    }

    host_obj->host_iface = host_iface;
    if(flags & HOSTOBJ_CONSTRUCTOR)
        host_obj->jsdisp.is_constructor = TRUE;
    if(flags & HOSTOBJ_VOLATILE_PROPS)
        host_obj->jsdisp.has_volatile_props = TRUE;
    *ret = &host_obj->jsdisp.IWineJSDispatch_iface;
    return S_OK;
}

IWineJSDispatchHost *get_host_dispatch(IDispatch *disp)
{
    IWineJSDispatchHost *ret;
    HostObject *host_obj;
    jsdisp_t *jsdisp;

    if(!(jsdisp = to_jsdisp(disp)))
        return NULL;
    if(jsdisp->builtin_info != &HostObject_info)
        return NULL;

    host_obj = HostObject_from_jsdisp(jsdisp);
    IWineJSDispatchHost_GetOuterDispatch(host_obj->host_iface, &ret);
    return ret;
}

HRESULT fill_globals(script_ctx_t *ctx, IWineJSDispatchHost *script_global)
{
    jsdisp_t *global = ctx->global;
    DISPID id = DISPID_STARTENUM;
    struct property_info desc;
    HRESULT hres;

    for(;;) {
        hres = jsdisp_next_prop(global, id, JSDISP_ENUM_OWN, &id);
        if(hres == S_FALSE)
            break;
        if(FAILED(hres))
            return hres;

        hres = IWineJSDispatchHost_LookupProperty(script_global, get_prop(global, id)->name, fdexNameCaseSensitive, &desc);
        if(FAILED(hres))
            return hres;
    }

    return S_OK;
}