65556 2011-08-02 11:57:52 -0700 JSC GC uses dummy cells to avoid having to remember which cells it has already destroyed 2011-08-02 14:22:56 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All RESOLVED FIXED P2 Normal --- 1 fpizlo webkit-unassigned fpizlo oliver webkit.review.bot oldest_to_newest 445394 0 fpizlo 2011-08-02 11:57:52 -0700 The JSC GC attempts to maintain the invariant that every cell within a marked block has a C++ object that inherits from JSCell, so that anytime a sweep is performed, destructors can be called on all free cells even if this was done already. This requires infrastructure for "dummy" JSCells, with "dummy" structures, just to allow the garbage collector to get around having to do bookkeeping about which parts of memory have already been swept. Dummy cells should be replaced with a collector-internal mechanism for tracking which memory has already been swept. 445402 1 102674 fpizlo 2011-08-02 12:04:46 -0700 Created attachment 102674 the patch 445408 2 webkit.review.bot 2011-08-02 12:07:35 -0700 Attachment 102674 did not pass style-queue: Failed to run "['Tools/Scripts/check-webkit-style', '--diff-files', u'Source/JavaScriptCore/ChangeLog', u'Source..." exit_code: 1 Source/JavaScriptCore/heap/MarkedBlock.cpp:217: One line control clauses should not use braces. [whitespace/braces] [4] Source/JavaScriptCore/heap/MarkedBlock.h:173: The parameter name "cell" adds no information, so it should be removed. [readability/parameter_name] [5] Total errors found: 2 in 5 files If any of these errors are false positives, please file a bug against check-webkit-style. 445450 3 102685 fpizlo 2011-08-02 12:52:18 -0700 Created attachment 102685 the patch 445471 4 102685 oliver 2011-08-02 13:06:52 -0700 Comment on attachment 102685 the patch View in context: https://bugs.webkit.org/attachment.cgi?id=102685&action=review > Source/JavaScriptCore/heap/MarkedBlock.h:77 > FreeCell* next; > + > + void setNoObject() > + { > + *reinterpret_cast<void**>(this) = 0; > + } Why this cast void**? FreeCell doesn't have a vtable pointer, you're simply assigning null to this->next? 445479 5 fpizlo 2011-08-02 13:12:26 -0700 (In reply to comment #4) > (From update of attachment 102685 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=102685&action=review > > > Source/JavaScriptCore/heap/MarkedBlock.h:77 > > FreeCell* next; > > + > > + void setNoObject() > > + { > > + *reinterpret_cast<void**>(this) = 0; > > + } > > Why this cast void**? FreeCell doesn't have a vtable pointer, you're simply assigning null to this->next? I did that to emphasize the fact that I'm setting what-would-have-been-a-vtable to 0. I suppose a comment would do the same job, so I'll post a fix. 445485 6 102690 fpizlo 2011-08-02 13:17:53 -0700 Created attachment 102690 the patch 445530 7 102690 webkit.review.bot 2011-08-02 14:22:51 -0700 Comment on attachment 102690 the patch Clearing flags on attachment: 102690 Committed r92233: <http://trac.webkit.org/changeset/92233> 445531 8 webkit.review.bot 2011-08-02 14:22:56 -0700 All reviewed patches have been landed. Closing bug. 102674 2011-08-02 12:04:46 -0700 2011-08-02 12:52:18 -0700 the patch nodummies_patch_1.diff text/plain 20288 fpizlo SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gOTIyMTQpCisrKyBTb3VyY2Uv SmF2YVNjcmlwdENvcmUvQ2hhbmdlTG9nCSh3b3JraW5nIGNvcHkpCkBAIC0xLDMgKzEsNTAgQEAK KzIwMTEtMDgtMDIgIEZpbGlwIFBpemxvICA8ZnBpemxvQGFwcGxlLmNvbT4KKworICAgICAgICBK U0MgR0MgdXNlcyBkdW1teSBjZWxscyB0byBhdm9pZCBoYXZpbmcgdG8gcmVtZW1iZXIgd2hpY2gg Y2VsbHMKKyAgICAgICAgaXQgaGFzIGFscmVhZHkgZGVzdHJveWVkCisgICAgICAgIGh0dHBzOi8v YnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD02NTU1NgorCisgICAgICAgIFJldmlld2Vk IGJ5IE5PQk9EWSAoT09QUyEpLgorICAgICAgICAKKyAgICAgICAgVGhpcyBnZXRzIHJpZCBvZiBk dW1teSBjZWxscywgYW5kIGVuc3VyZXMgdGhhdCBpdCdzIG5vdCBuZWNlc3NhcnkKKyAgICAgICAg dG8gaW52b2tlIGEgZGVzdHJ1Y3RvciBvbiBjZWxscyB0aGF0IGhhdmUgYWxyZWFkeSBiZWVuIHN3 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