mirror of
https://github.com/mozilla/gecko-dev.git
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137 lines
3.9 KiB
C++
137 lines
3.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 sw=2 et tw=78: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* This is not a generated file. It contains common utility functions
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* invoked from the JavaScript code generated from IDL interfaces.
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* The goal of the utility functions is to cut down on the size of
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* the generated code itself.
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*/
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#include "nsJSUtils.h"
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#include "jsapi.h"
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#include "jsdbgapi.h"
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#include "prprf.h"
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#include "nsIScriptContext.h"
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#include "nsIScriptGlobalObject.h"
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#include "nsIServiceManager.h"
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#include "nsIXPConnect.h"
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#include "nsCOMPtr.h"
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#include "nsIScriptSecurityManager.h"
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#include "nsPIDOMWindow.h"
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#include "nsDOMJSUtils.h" // for GetScriptContextFromJSContext
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#include "mozilla/dom/BindingUtils.h"
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JSBool
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nsJSUtils::GetCallingLocation(JSContext* aContext, const char* *aFilename,
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PRUint32* aLineno)
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{
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JSScript* script = nsnull;
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unsigned lineno = 0;
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if (!JS_DescribeScriptedCaller(aContext, &script, &lineno)) {
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return JS_FALSE;
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}
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*aFilename = ::JS_GetScriptFilename(aContext, script);
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*aLineno = lineno;
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return JS_TRUE;
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}
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nsIScriptGlobalObject *
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nsJSUtils::GetStaticScriptGlobal(JSContext* aContext, JSObject* aObj)
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{
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JSClass* clazz;
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JSObject* glob = aObj; // starting point for search
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if (!glob)
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return nsnull;
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glob = JS_GetGlobalForObject(aContext, glob);
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NS_ABORT_IF_FALSE(glob, "Infallible returns null");
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clazz = JS_GetClass(glob);
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// Whenever we end up with globals that are JSCLASS_IS_DOMJSCLASS
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// and have an nsISupports DOM object, we will need to modify this
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// check here.
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MOZ_ASSERT(!(clazz->flags & JSCLASS_IS_DOMJSCLASS));
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nsISupports* supports;
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if (!(clazz->flags & JSCLASS_HAS_PRIVATE) ||
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!(clazz->flags & JSCLASS_PRIVATE_IS_NSISUPPORTS) ||
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!(supports = (nsISupports*)::JS_GetPrivate(glob))) {
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return nsnull;
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}
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// We might either have a window directly (e.g. if the global is a
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// sandbox whose script object principal pointer is a window), or an
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// XPCWrappedNative for a window. We could also have other
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// sandbox-related script object principals, but we can't do much
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// about those short of trying to walk the proto chain of |glob|
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// looking for a window or something.
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nsCOMPtr<nsIScriptGlobalObject> sgo(do_QueryInterface(supports));
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if (!sgo) {
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nsCOMPtr<nsIXPConnectWrappedNative> wrapper(do_QueryInterface(supports));
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NS_ENSURE_TRUE(wrapper, nsnull);
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sgo = do_QueryWrappedNative(wrapper);
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}
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// We're returning a pointer to something that's about to be
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// released, but that's ok here.
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return sgo;
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}
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nsIScriptContext *
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nsJSUtils::GetStaticScriptContext(JSContext* aContext, JSObject* aObj)
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{
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nsIScriptGlobalObject *nativeGlobal = GetStaticScriptGlobal(aContext, aObj);
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if (!nativeGlobal)
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return nsnull;
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return nativeGlobal->GetScriptContext();
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}
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nsIScriptGlobalObject *
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nsJSUtils::GetDynamicScriptGlobal(JSContext* aContext)
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{
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nsIScriptContext *scriptCX = GetDynamicScriptContext(aContext);
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if (!scriptCX)
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return nsnull;
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return scriptCX->GetGlobalObject();
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}
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nsIScriptContext *
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nsJSUtils::GetDynamicScriptContext(JSContext *aContext)
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{
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return GetScriptContextFromJSContext(aContext);
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}
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PRUint64
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nsJSUtils::GetCurrentlyRunningCodeInnerWindowID(JSContext *aContext)
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{
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if (!aContext)
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return 0;
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PRUint64 innerWindowID = 0;
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JSObject *jsGlobal = JS_GetGlobalForScopeChain(aContext);
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if (jsGlobal) {
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nsIScriptGlobalObject *scriptGlobal = GetStaticScriptGlobal(aContext,
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jsGlobal);
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if (scriptGlobal) {
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nsCOMPtr<nsPIDOMWindow> win = do_QueryInterface(scriptGlobal);
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if (win)
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innerWindowID = win->WindowID();
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}
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}
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return innerWindowID;
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}
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