青少年科创大赛作品:QTBUG-17355 QML "Bus error" caused by align in mips platform

来源：百度文库 编辑：九乡新闻网 时间：2024/05/05 19:57:40
  • Qt  
  • QTBUG-17355 (https://bugreports.qt.nokia.com/browse/QTBUG-17355?page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#issue-tabs)

It is a problem about align in mips platform


Description

In src/script/bridge/qscriptdeclarativeclass_p.h 75 line

"dummy[8]" will cause qml "bus error",When I modify it to "char dummy[8] _attribute_ ((aligned(8)))",it can work normally.

First I use Qt in soft-float environment,so it performance good. If I change environment to hard-float,it would "bus error",when I run qml; I trace this problem ,i find error occur in "JSValue.h" .But it is called in "QScriptDeclarative::Value::Value(QScriptEngine *eng,float value)".So I think it's a problem of align.

I think in embed environment ,it need 8 byte align for use double type.
 Comments

In QtQuick2 we've switched to V8, which doesn't have this problem.

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