Comments on: Working on the JS engine http://blog.mozilla.com/mrbkap/2009/06/30/working-on-the-js-engine/ A blog about wrappers Wed, 01 Jul 2009 01:36:11 -0700 http://wordpress.org/?v=2.8.6 hourly 1 By: Jeff Walden http://blog.mozilla.com/mrbkap/2009/06/30/working-on-the-js-engine/comment-page-1/#comment-13 Jeff Walden Wed, 01 Jul 2009 01:36:11 +0000 http://blog.mozilla.com/mrbkap/2009/06/30/working-on-the-js-engine/#comment-13 Dude, it's so much more intelligible when you spit it out on one line: (gdb) p ((JSString*)((uintptr_t)$.atom&~7))->mLength&~(1<<29) $11 = 4 (gdb) x/4ch ((JSString*)((uintptr_t)$.atom&~7))->mChars 0xaf434970: 97 'a' 98 'b' 99 'c' 100 'd' (there may be typos above, I didn't bother firing up a debugger to record a real such sequence, but I think those are all the right field names and bitmasks :-) ) Dude, it’s so much more intelligible when you spit it out on one line:

(gdb) p ((JSString*)((uintptr_t)$.atom&~7))->mLength&~(1<<29)
$11 = 4
(gdb) x/4ch ((JSString*)((uintptr_t)$.atom&~7))->mChars
0xaf434970: 97 ‘a’ 98 ‘b’ 99 ‘c’ 100 ‘d’

(there may be typos above, I didn’t bother firing up a debugger to record a real such sequence, but I think those are all the right field names and bitmasks :-) )

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