QML在Mips上运行崩溃问题

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项目中需要使用QT4.8.3中的QtQuick，编写的QML文件一旦运行就会崩溃。主要现象：

1、使用Behavior on X{

Animation{

}

发现只要对某个属性使用Behavior并且定义其变化的动画时，程序崩溃

2、使用属性Attach

xposition1: xposition/3

只要在属性Attach时使用除法，程序也崩溃。

最后发现崩溃点在JSValue.h文件中的，被WTF_USE_JSVALUE32_64宏进行保护的代码中，ChangeLog中明确说明Mips是支持这个宏的，对于X86或者PPC则不支持，原因是Padding和Alignment。

直接将其换成WTF_USE_JSVALUE32即可解决问题。

这个宏的意义在于：https://bugs.webkit.org/show_bug.cgi?id=29268

Csaba Osztrogonác 2010-09-09 10:07:53 PDT

(In reply to comment #12)> > I tried JSVALUE32_64 with QtWebKit/Windows/MinGW again, and it works now. :)> > I don't know which changeset fixed it in the last 5 months. :)> > > > It works now, so I propose to switch to JSVALUE32_64.> > SunSpider will be 1.60x faster, but V8 will be 1.19x slower.> > do not they care about this perf regression, or i'm missing something?The difference between JSVALUE32 and JSVALUE32_64 is the size of JSValue,which can be 32 bit or 64 bit. The JSVALUE32_64 is faster when you workwith a lot of 64 bit sized numbers (long int, double) such as 3D tests inSunSpider. Unfortunately it has a little performance regression if yourapplication can't exploit the 64 bit sized JSValues.But we have to know the only choice is JSVALUE32_64, because WebKit community don't intend to support JSVALUE32 in the future as Gavin said.

不过不清楚为什么在我的嵌入式平台不支持。

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