476088 - trap() changes TypeError message

Status: RESOLVED WORKSFORME

(Core :: JavaScript Engine, defect)

Description

[Jesse Ruderman]

js> f = function() { var x; x.y; }
function () {
    var x;
    x.y;
}

js> dis(f);
flags: LAMBDA INTERPRETED
main:
00000:  getlocal 0
00003:  pop
00004:  getlocalprop 0 "y"
00009:  pop
00010:  stop

Source notes:
  0:     0 [   0] decl     offset 0

js> f();
typein:1: TypeError: x is undefined
js> trap(f, 0, "");
js> f();
typein:1: TypeError: x.y is undefined

Comment 1

[Hannes Verschore [:h4writer]]

Using latest mozilla-inbound I get the following when executing the testcase:

js> f = function() { var x; x.y; }
(function () {var x;x.y;})
js> dis(f);
flags: LAMBDA NULL_CLOSURE
loc     op
-----   --
main:
00000:  getlocal 0
00003:  pop
00004:  getlocal 0
00007:  getprop "y"
00010:  pop
00011:  stop

Source notes:
 ofs  line    pc  delta desc     args
---- ---- ----- ------ -------- ------
  0:    1     0 [   0] decl     offset 0
  2:    1     7 [   7] pcbase   offset 3

js> f();
typein:1: TypeError: x is undefined
js> trap(f, 0, "");
js> f();
typein:1: TypeError: x is undefined
js> 

Could not find the original bug report fixing this bug,
so I mark it as WORKSFORME.

Comment 2

[Hannes Verschore [:h4writer]]

Attachment: Add testcase

@Ryan: I suppose that flag means you want a testcase? I added a patch containing the testcase. I hope it is in the right place with the right parameters (debug needed!)? I added you as reviewer. Feel free to point it to somebody else, but it's only a testcase ...

Comment 3

[Ryan VanderMeulen [:RyanVM]]

Comment on attachment 577606 [details] [diff] [review]
Add testcase

In general, it's always good to add tests for bugs that go away whether FIXED or WORKSFORME. I'm not the right reviewer for it though. Sending over to Jesse. I can push it to try later, though.

Comment 4

[Jesse Ruderman]

Thanks for converting the test, Hannes :)

Comment 5

[Boris Zbarsky [:bzbarsky]]

https://hg.mozilla.org/integration/mozilla-inbound/rev/c7d671e9cf58

For future reference, it would be awesome to have a checkin comment and User/From line in the patch!

Comment 6

[Marco Bonardo [:mak]]

https://hg.mozilla.org/mozilla-central/rev/c7d671e9cf58