Bug 184907

Summary:	JSC needs to provide a basic handle api
Product:	WebKit	Reporter:	Oliver Hunt <oliver>
Component:	JavaScriptCore	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	fpizlo, jfbastien, mark.lam, oliver
Priority:	P2
Version:	Other
Hardware:	Unspecified
OS:	Unspecified

Description Oliver Hunt 2018-04-23 22:53:09 PDT

I'm trying to write an "interesting" js program and it keeps being frustrating to try and manage lifetime in the C API.

The problems that I keep hitting is that JSValueProtect/Unprotect require a context argument, that means a smart pointer has to carry both the value and context references.

The other problem is weak and conditional ownership.

I think an API along the lines of

typedef JSHandleRef

JSHandleRef JSHandleMake(JSContextRef)
JSHandleRef JSHandleMakeWeak(JSContextRef, nullable JSWeakCallback)

// Note the lack of a context here -- I believe that is completely achievable.
void JSHandleRetain(JSHandleRef)
void JSHandleRelease(JSHandleRef)

// While it would be nice to just have a "get slot" style api, I think that would
// result in ABI heartbreak down the road
JSValueRef JSHandleGetValue(JSHandleRef)
void JSHandleSetValue(JSHandleRef, JSValueRef)