gecko-dev/tools/profiler/JSObjectBuilder.h
Jeff Muizelaar d9feb65b18 Bug 739510. JSObjectBuilder: Speed up construction of char * properties. r=ehsan
This eliminates two additional copies: NS_ConvertASCIItoUTF16 and
PromiseFlatString by constructing the JSString directly. It is also designed so
that literal strings will have their strlen computed at compile time.

--HG--
extra : rebase_source : 05169480e6ffbf42a9f5cc131dc775c699841b19
2012-03-26 23:35:28 -04:00

167 lines
4.6 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** 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
* Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2012
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Jeff Muizelaar <jmuizelaar@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either 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 ***** */
#include "jsapi.h"
/* this is handy wrapper around JSAPI to make it more pleasant to use.
* We collect the JSAPI errors and so that callers don't need to */
class JSObjectBuilder
{
public:
void DefineProperty(JSObject *aObject, const char *name, JSObject *aValue)
{
if (!mOk)
return;
mOk = JS_DefineProperty(mCx, aObject, name, OBJECT_TO_JSVAL(aValue), NULL, NULL, JSPROP_ENUMERATE);
}
void DefineProperty(JSObject *aObject, const char *name, int value)
{
if (!mOk)
return;
mOk = JS_DefineProperty(mCx, aObject, name, INT_TO_JSVAL(value), NULL, NULL, JSPROP_ENUMERATE);
}
void DefineProperty(JSObject *aObject, const char *name, double value)
{
if (!mOk)
return;
mOk = JS_DefineProperty(mCx, aObject, name, DOUBLE_TO_JSVAL(value), NULL, NULL, JSPROP_ENUMERATE);
}
void DefineProperty(JSObject *aObject, const char *name, nsAString &value)
{
if (!mOk)
return;
const nsString &flat = PromiseFlatString(value);
JSString *string = JS_NewUCStringCopyN(mCx, static_cast<const jschar*>(flat.get()), flat.Length());
if (!string)
mOk = JS_FALSE;
if (!mOk)
return;
mOk = JS_DefineProperty(mCx, aObject, name, STRING_TO_JSVAL(string), NULL, NULL, JSPROP_ENUMERATE);
}
void DefineProperty(JSObject *aObject, const char *name, const char *value, size_t valueLength)
{
if (!mOk)
return;
JSString *string = JS_NewStringCopyN(mCx, value, valueLength);
if (!string) {
mOk = JS_FALSE;
return;
}
mOk = JS_DefineProperty(mCx, aObject, name, STRING_TO_JSVAL(string), NULL, NULL, JSPROP_ENUMERATE);
}
void DefineProperty(JSObject *aObject, const char *name, const char *value)
{
DefineProperty(aObject, name, value, strlen(value));
}
void ArrayPush(JSObject *aArray, int value)
{
if (!mOk)
return;
jsval objval = INT_TO_JSVAL(value);
uint32_t length;
mOk = JS_GetArrayLength(mCx, aArray, &length);
if (!mOk)
return;
mOk = JS_SetElement(mCx, aArray, length, &objval);
}
void ArrayPush(JSObject *aArray, JSObject *aObject)
{
if (!mOk)
return;
jsval objval = OBJECT_TO_JSVAL(aObject);
uint32_t length;
mOk = JS_GetArrayLength(mCx, aArray, &length);
if (!mOk)
return;
mOk = JS_SetElement(mCx, aArray, length, &objval);
}
JSObject *CreateArray() {
JSObject *array = JS_NewArrayObject(mCx, 0, NULL);
if (!array)
mOk = JS_FALSE;
return array;
}
JSObject *CreateObject() {
JSObject *obj = JS_NewObject(mCx, NULL, NULL, NULL);
if (!obj)
mOk = JS_FALSE;
return obj;
}
// We need to ensure that this object lives on the stack so that GC sees it properly
JSObjectBuilder(JSContext *aCx) : mCx(aCx), mOk(JS_TRUE)
{
}
private:
JSObjectBuilder(JSObjectBuilder&);
JSContext *mCx;
JSObject *mObj;
JSBool mOk;
};