425066 - Strict mode: 'reference to undefined property' sometimes not given when it should be

Status: RESOLVED WORKSFORME

(Core :: JavaScript Engine, defect)

Description

[David Mandelin [:dmandelin]]

Attachment: Test case for command-line 'js'

The attached file shows two cases that appear the same to the programmer, but only one produces the warning. 

The branch in the code that makes the difference is in jsobj.c near line 455:

                if (!JS_HAS_STRICT_OPTION(cx) ||
                    (op != JSOP_GETPROP && op != JSOP_GETELEM)) {
                    return JS_TRUE;
                }

In my test file, in the case where no warning appears, the opcode is JSOP_GETLOCALPROP. I suspect JSOP_GETARGPROP, JSOP_GETVARPROP, and JSOP_GETLOCALPROP are also relevant.