gecko/dom/base/nsJSUtils.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et tw=78: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Vidur Apparao <vidur@netscape.com>
* L. David Baron <dbaron@mozillafoundation.org>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/**
* This is not a generated file. It contains common utility functions
* invoked from the JavaScript code generated from IDL interfaces.
* The goal of the utility functions is to cut down on the size of
* the generated code itself.
*/
#include "nsJSUtils.h"
#include "jsapi.h"
#include "jsdbgapi.h"
#include "prprf.h"
#include "nsIScriptContext.h"
#include "nsIScriptObjectOwner.h"
#include "nsIScriptGlobalObject.h"
#include "nsIServiceManager.h"
#include "nsIXPConnect.h"
#include "nsCOMPtr.h"
#include "nsContentUtils.h"
#include "nsIScriptSecurityManager.h"
#include "nsDOMJSUtils.h" // for GetScriptContextFromJSContext
JSBool
nsJSUtils::GetCallingLocation(JSContext* aContext, const char* *aFilename,
PRUint32* aLineno, nsIPrincipal* aPrincipal)
{
// Get the current filename and line number
JSStackFrame* frame = nsnull;
JSScript* script = nsnull;
do {
frame = ::JS_FrameIterator(aContext, &frame);
if (frame) {
script = ::JS_GetFrameScript(aContext, frame);
}
} while (frame && !script);
if (script) {
// If aPrincipals is non-null then our caller is asking us to ensure
// that the filename we return does not have elevated privileges.
if (aPrincipal) {
uint32 flags = JS_GetScriptFilenameFlags(script);
// Use the principal for the filename if it shouldn't be receiving
// implicit XPCNativeWrappers.
PRBool system;
if (flags & JSFILENAME_PROTECTED) {
nsIScriptSecurityManager *ssm = nsContentUtils::GetSecurityManager();
if (NS_FAILED(ssm->IsSystemPrincipal(aPrincipal, &system)) || !system) {
JSPrincipals* jsprins;
aPrincipal->GetJSPrincipals(aContext, &jsprins);
*aFilename = jsprins->codebase;
*aLineno = 0;
JSPRINCIPALS_DROP(aContext, jsprins);
return JS_TRUE;
}
}
}
const char* filename = ::JS_GetScriptFilename(aContext, script);
if (filename) {
PRUint32 lineno = 0;
jsbytecode* bytecode = ::JS_GetFramePC(aContext, frame);
if (bytecode) {
lineno = ::JS_PCToLineNumber(aContext, script, bytecode);
}
*aFilename = filename;
*aLineno = lineno;
return JS_TRUE;
}
}
return JS_FALSE;
}
nsIScriptGlobalObject *
nsJSUtils::GetStaticScriptGlobal(JSContext* aContext, JSObject* aObj)
{
nsISupports* supports;
JSClass* clazz;
JSObject* parent;
JSObject* glob = aObj; // starting point for search
if (!glob)
return nsnull;
while ((parent = ::JS_GetParent(aContext, glob)))
glob = parent;
clazz = JS_GET_CLASS(aContext, glob);
if (!clazz ||
!(clazz->flags & JSCLASS_HAS_PRIVATE) ||
!(clazz->flags & JSCLASS_PRIVATE_IS_NSISUPPORTS) ||
!(supports = (nsISupports*)::JS_GetPrivate(aContext, glob))) {
return nsnull;
}
nsCOMPtr<nsIXPConnectWrappedNative> wrapper(do_QueryInterface(supports));
NS_ENSURE_TRUE(wrapper, nsnull);
nsCOMPtr<nsIScriptGlobalObject> sgo(do_QueryWrappedNative(wrapper));
// We're returning a pointer to something that's about to be
// released, but that's ok here.
return sgo;
}
nsIScriptContext *
nsJSUtils::GetStaticScriptContext(JSContext* aContext, JSObject* aObj)
{
nsIScriptGlobalObject *nativeGlobal = GetStaticScriptGlobal(aContext, aObj);
if (!nativeGlobal)
return nsnull;
return nativeGlobal->GetScriptContext(nsIProgrammingLanguage::JAVASCRIPT);
}
nsIScriptGlobalObject *
nsJSUtils::GetDynamicScriptGlobal(JSContext* aContext)
{
nsIScriptContext *scriptCX = GetDynamicScriptContext(aContext);
if (!scriptCX)
return nsnull;
return scriptCX->GetGlobalObject();
}
nsIScriptContext *
nsJSUtils::GetDynamicScriptContext(JSContext *aContext)
{
return GetScriptContextFromJSContext(aContext);
}