ScriptRequest Class Reference

Spidermonkey maintains some 'local' state via the JSContext* object. More...

#include <ScriptRequest.h>

Collaboration diagram for ScriptRequest:

Public Member Functions
	ScriptRequest (const ScriptInterface &scriptInterface)
	NB: the definitions are in scriptinterface.cpp, because these access members of the PImpled implementation of ScriptInterface, and that seemed more convenient. More...
	ScriptRequest (const ScriptInterface *scriptInterface)
	ScriptRequest (std::shared_ptr< ScriptInterface > scriptInterface)
	~ScriptRequest ()
	ScriptRequest (JSContext *cx)
	Create a script request from a JSContext. More...
const ScriptInterface &	GetScriptInterface () const
	Return the scriptInterface active when creating this ScriptRequest. More...
JS::Value	globalValue () const

Public Attributes
JSContext *	cx
JS::HandleObject	glob
JS::HandleObject	nativeScope

Private Member Functions
	ScriptRequest ()=delete
	ScriptRequest (const ScriptRequest &rq)=delete
ScriptRequest &	operator= (const ScriptRequest &rq)=delete

Private Attributes
const ScriptInterface &	m_ScriptInterface
JS::Realm *	m_FormerRealm

Detailed Description

Spidermonkey maintains some 'local' state via the JSContext* object.

This object is an argument to most JSAPI functions. Furthermore, this state is Realm (~ global) dependent. For many reasons, including GC safety, The JSContext* Realm must be set up correctly when accessing it. 'Entering' and 'Leaving' realms must be done in a LIFO manner. SM recommends using JSAutoRealm, which provides an RAII option.

ScriptRequest combines both of the above in a single convenient package, providing safe access to the JSContext*, the global object, and ensuring that the proper realm has been entered. Most scriptinterface/ functions will take a ScriptRequest, to ensure proper rooting. You may sometimes have to create one from a ScriptInterface.

Be particularly careful when manipulating several script interfaces.

Constructor & Destructor Documentation

ScriptRequest() [1/6]

ScriptRequest::ScriptRequest ( )

privatedelete

ScriptRequest() [2/6]

ScriptRequest::ScriptRequest ( const ScriptRequest &  rq )

privatedelete

ScriptRequest() [3/6]

ScriptRequest::ScriptRequest

(

const ScriptInterface &

scriptInterface

)

NB: the definitions are in scriptinterface.cpp, because these access members of the PImpled implementation of ScriptInterface, and that seemed more convenient.

Constructor for ScriptRequest - here because it needs access into ScriptInterface_impl.

ScriptRequest() [4/6]

ScriptRequest::ScriptRequest ( const ScriptInterface *  scriptInterface )

inline

ScriptRequest() [5/6]

ScriptRequest::ScriptRequest ( std::shared_ptr< ScriptInterface >  scriptInterface )

inline

~ScriptRequest()

ScriptRequest::~ScriptRequest

(

)

ScriptRequest() [6/6]

ScriptRequest::ScriptRequest

(

JSContext *

cx

)

Create a script request from a JSContext.

This can be used to get the script interface in a JSNative function. In general, you shouldn't have to rely on this otherwise.

Member Function Documentation

GetScriptInterface()

const ScriptInterface & ScriptRequest::GetScriptInterface

(

)

const

Return the scriptInterface active when creating this ScriptRequest.

Note that this is multi-request safe: even if another ScriptRequest is created, it will point to the original scriptInterface, and thus can be used to re-enter the realm.

globalValue()

JS::Value ScriptRequest::globalValue

(

)

const

operator=()

ScriptRequest& ScriptRequest::operator= ( const ScriptRequest &  rq )

privatedelete

Member Data Documentation

cx

JSContext* ScriptRequest::cx

glob

JS::HandleObject ScriptRequest::glob

m_FormerRealm

JS::Realm* ScriptRequest::m_FormerRealm

private

m_ScriptInterface

const ScriptInterface& ScriptRequest::m_ScriptInterface

private

nativeScope

JS::HandleObject ScriptRequest::nativeScope

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The documentation for this class was generated from the following files:

• /zpool0/docker-engine-docs/source/scriptinterface/ScriptRequest.h
• /zpool0/docker-engine-docs/source/scriptinterface/ScriptInterface.cpp