From 2e767e81cc1682597b3d42a0ca1dcebdf909aaaa Mon Sep 17 00:00:00 2001
From: Jacek Caban <jacek@codeweavers.com>
Date: Fri, 5 Jun 2020 18:26:39 +0200
Subject: [PATCH] jscript: Add Object.preventExtensions semi-stub
 implementation.

Signed-off-by: Jacek Caban <jacek@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
---
 dlls/jscript/object.c    | 24 +++++++++++++++++++++++-
 dlls/mshtml/tests/es5.js | 23 ++++++++++++++++++++++-
 2 files changed, 45 insertions(+), 2 deletions(-)

diff --git a/dlls/jscript/object.c b/dlls/jscript/object.c
index bac79ebde26..1e94f163446 100644
--- a/dlls/jscript/object.c
+++ b/dlls/jscript/object.c
@@ -671,13 +671,35 @@ static HRESULT Object_keys(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags,
     return hres;
 }
 
+static HRESULT Object_preventExtensions(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv, jsval_t *r)
+{
+    jsdisp_t *obj;
+
+    if(!argc || !is_object_instance(argv[0]) || !get_object(argv[0])) {
+        FIXME("invalid arguments\n");
+        return E_NOTIMPL;
+    }
+
+    FIXME("(%s) semi-stub\n", debugstr_jsval(argv[0]));
+
+    obj = to_jsdisp(get_object(argv[0]));
+    if(!obj) {
+        FIXME("Non-JS object\n");
+        return E_NOTIMPL;
+    }
+
+    if(r) *r = jsval_obj(jsdisp_addref(obj));
+    return S_OK;
+}
+
 static const builtin_prop_t ObjectConstr_props[] = {
     {L"create",                   Object_create,                      PROPF_ES5|PROPF_METHOD|2},
     {L"defineProperties",         Object_defineProperties,            PROPF_ES5|PROPF_METHOD|2},
     {L"defineProperty",           Object_defineProperty,              PROPF_ES5|PROPF_METHOD|2},
     {L"getOwnPropertyDescriptor", Object_getOwnPropertyDescriptor,    PROPF_ES5|PROPF_METHOD|2},
     {L"getPrototypeOf",           Object_getPrototypeOf,              PROPF_ES5|PROPF_METHOD|1},
-    {L"keys",                     Object_keys,                        PROPF_ES5|PROPF_METHOD|1}
+    {L"keys",                     Object_keys,                        PROPF_ES5|PROPF_METHOD|1},
+    {L"preventExtensions",        Object_preventExtensions,           PROPF_ES5|PROPF_METHOD|1},
 };
 
 static const builtin_info_t ObjectConstr_info = {
diff --git a/dlls/mshtml/tests/es5.js b/dlls/mshtml/tests/es5.js
index f268eba24c6..ded25df5128 100644
--- a/dlls/mshtml/tests/es5.js
+++ b/dlls/mshtml/tests/es5.js
@@ -924,7 +924,28 @@ sync_test("reduce", function() {
     try {
         [].reduce(function(a) { return 0; });
         ok(false, "expected exception");
-    }catch(e) {trace(e.message);}
+    }catch(e) {}
 
     ok(Array.prototype.reduce.length === 1, "Array.prototype.reduce.length = " + Array.prototype.reduce.length);
 });
+
+sync_test("preventExtensions", function() {
+    var o = {};
+    var r = Object.preventExtensions(o);
+    ok(r === o, "r != o");
+    o.x = 1;
+    todo_wine.
+    ok(!("x" in o), "x property added to o");
+    try {
+        Object.defineProperty(o, "y", { value: true });
+        todo_wine.
+        ok(false, "expected exception");
+    }catch(e) {
+        ok(e.name === "TypeError", "got " + e.name + " exception");
+    }
+
+    r = Object.preventExtensions(o);
+    ok(r === o, "r != o");
+
+    ok(Object.preventExtensions.length === 1, "Object.preventExtensions.length = " + Object.preventExtensions.length);
+});