297247 - want ability to pass script in chunks to the js engine

Status: RESOLVED DUPLICATE of bug 274651

(Core :: JavaScript Engine, enhancement, P5)

Description

[Christian :Biesinger (don't email me, ping me on IRC)]

a possible enhancement to nsScriptLoader (convert to nsIUnicharInputStream, to
avoid manual charset conversion) would like the ability to pass data in chunks
to the javascript engine.

I believe the current APIs do not allow that, as they might incorrectly compile
code like:
var foo = 42
+ 4711

If a buffer boundary is between the two lines.

The code can tell the JS engine which chunk is the last (or more convenient
would be if it told the JS engine that the previous chunk would be last, actually)

So, such a function would be nice. I'm not familiar enough with JS API to
suggest naming/syntax.

Comment 1

[Brendan Eich [:brendan]]

Given the current recursive descent front end in js/src/jsparse.c, this requires
running the JS engine, or at least the compiler, in a coroutine, fiber, or
similar such lightweight thread.  The parser's state is smeared across arbitrary
C stack frames, so deciding an API naming is the last detail.

This should await a larger rearchitecture step to move toward JS2 (which still
needs definition).

/be

Comment 2

[Bernard Alleysson]

dup of bug 274651 ?

Comment 3

[Christian :Biesinger (don't email me, ping me on IRC)]

hm, yes. I must've forgotten about that bug...

*** This bug has been marked as a duplicate of 274651 ***