Re: Draft Proposal for Namespaces in Objective-C

• Subject: Re: Draft Proposal for Namespaces in Objective-C
• From: Jonathan Schleifer <email@hidden>
• Date: Wed, 18 Apr 2012 17:52:19 +0200
• Authentication-results: symauth.service.identifier

Am 18.04.2012 um 17:41 schrieb Remy Demarest:

> As far as I can tell from Apple runtime code, the cache for objc_msgSend IMPs is per class and is expanded as needed.


Strange, looks to me like the cache can never get bigger than mask:

.macro  CacheLookup
[…]
        andl    mask(%r10), êx                // index &= mask
        movq    buckets(%r10, %rax, 8), %r11    // method = cache->buckets[index]
        incl    êx                            // index++
        testq   %r11, %r11                      // if (method == NULL)
        je      LCacheMiss_f                    //   goto cacheMissLabel
.if $0 != STRET
        cmpq    method_name(%r11), ¢          // if (method_name != sel)
.else
        cmpq    method_name(%r11), £          // if (method_name != sel)
.endif
        jne     1b                              //   goto loop
[…]

Am I missing something?

--
Jonathan


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