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Last Comment Bug 691993 - Fully split up deleteProperty into property/element/special/generic forms
: Fully split up deleteProperty into property/element/special/generic forms
Product: Core
Classification: Components
Component: JavaScript Engine (show other bugs)
: unspecified
: All All
: -- normal (vote)
: mozilla10
Assigned To: Jeff Walden [:Waldo] (remove +bmo to email)
: Jason Orendorff [:jorendorff]
Depends on:
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Reported: 2011-10-04 17:56 PDT by Jeff Walden [:Waldo] (remove +bmo to email)
Modified: 2011-10-20 03:05 PDT (History)
2 users (show)
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Patch (20.78 KB, patch)
2011-10-04 17:56 PDT, Jeff Walden [:Waldo] (remove +bmo to email)
bhackett1024: review+
Details | Diff | Splinter Review

Description Jeff Walden [:Waldo] (remove +bmo to email) 2011-10-04 17:56:13 PDT
Created attachment 564723 [details] [diff] [review]

More dreariness.

This one in particular would be much nicer, generally, if the opcode format were split such that we had delprop, delelem, delval -- that is, we had specific bytecodes for deleting named properties and deleting index properties.  I tend to think that sort of bytecode mucking is better left to later on in API changes, so for now we get a bunch of deleteGeneric.
Comment 1 Brian Hackett (:bhackett) 2011-10-06 07:28:12 PDT
Comment on attachment 564723 [details] [diff] [review]

I don't understand the opcode format comment.  There are separate bytecodes already for DELNAME, DELPROP and DELELEM, and for DELELEM there is no way for the parser to tell ahead of time whether the property being deleted is named or indexed.
Comment 2 Jeff Walden [:Waldo] (remove +bmo to email) 2011-10-19 11:39:09 PDT
What I suggest is that DELELEM be split into a variant that deletes using a value on the stack to indicate the property to delete, and a variant that deletes using a constant index included in the bytecode stream:

  delete a.b  => delprop "b"
  delete a[2] => delelem 2
  delete a[c] => delval #(slot for c)

Or something like that.

It's possible there might not be the payoff in splitting up delelem that way, since delete is kind of uncommon.  But if there were such a split, delelem could use obj->deleteElement, delprop could use obj->deleteProperty, and delval could use obj->deleteGeneric (or longer-run something to disambiguate the val into an element, property, or special, then use delete{not Generic}).
Comment 3 Jeff Walden [:Waldo] (remove +bmo to email) 2011-10-19 14:10:25 PDT
Comment 4 Marco Bonardo [::mak] 2011-10-20 03:05:18 PDT

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