658950 - TI: "Assertion failure: JSOp(*yieldpc) == JSOP_YIELD," with trap

Status: RESOLVED FIXED

(Core :: JavaScript Engine, defect)

Description

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

Attachment: stack

f = (function() {
  let x;
  yield
})
trap(f, 6, undefined);
for (a in f())
  (function() {})()

asserts js debug shell on JM changeset d37ec0c318d6 with -d at Assertion failure: JSOp(*yieldpc) == JSOP_YIELD,

Comment 1

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

Tested with a 32-bit shell in 64-bit Ubuntu 11.04.

Comment 2

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

js> f = (function() {
  let x;
  yield
})
(function () {var x;yield;})
js> dis(f)
flags: LAMBDA NULL_CLOSURE
off     op
-----   --
00000:  generator
main:
00001:  getlocal 0
00004:  pop
00005:  push
00006:  yield        <-- trap goes here
00007:  pop
00008:  stop

Source notes:
 ofs  line    pc  delta desc     args
---- ---- ----- ------ -------- ------
  0:    1     1 [   1] newline 
  1:    2     1 [   0] decl     offset 0
  3:    2     5 [   4] newline 

js> trap(f, 6, undefined);
js> for (a in f())
  (function() {})()
Assertion failure: JSOp(*yieldpc) == JSOP_YIELD,

Comment 3

[Brian Hackett [Laid off!]]

Assert is bogus in the presence of a trap.  Is it possible to trap a JSOP_YIELD?

http://hg.mozilla.org/projects/jaegermonkey/rev/c3ed353baad4