124177 2013-11-11 17:40:05 -0800 REGRESSION (r158014): Many webpages throw stack overflow exceptions on iOS (because Parser::parseMemberExpression uses ~130K more stack) 2013-11-13 11:10:26 -0800 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All RESOLVED FIXED http://apple.com InRadar P2 Normal --- 1 msaboff oliver ggaren msaboff thorton webkit-bug-importer oldest_to_newest 949508 0 msaboff 2013-11-11 17:40:05 -0800 The introduction of StringPrintStream as well as WTFString variables in http://trac.webkit.org/changeset/158014 in the error handling macros caused an increase in the stack space needed by Parser<LexerType>::parseMemberExpression. On a X86 32 bit build, the size of the frame for parseMemberExpression (ebp - esp) is 82+K. According to disassembly of parseMemberExpression, counting the number of StringPrintStream constructor calls we end up with 336. Each of these appears to be allocated on the stack and has a static buffer of 128 bytes. There are also 1348 calls to the String() destructor. Each of the strings is a RefPtr and a StringImpl, which also appear to be allocated on the stack. Moving the StringPrintStream in the error macros to a member of the Parser class reduced the frame size to ~36K. Even after the reduction we still get a "RangeError: Maximum call stack size exceeded.” JSC exception. 949519 1 oliver 2013-11-11 18:40:47 -0800 hurk, i'll look into pushing that code out of the arser functions 949763 2 ggaren 2013-11-12 11:36:55 -0800 <rdar://problem/15450444> 950242 3 216821 oliver 2013-11-13 11:01:20 -0800 Created attachment 216821 Patch 950246 4 oliver 2013-11-13 11:10:26 -0800 Committed r159210: <http://trac.webkit.org/changeset/159210> 216821 2013-11-13 11:01:20 -0800 2013-11-13 11:04:10 -0800 Patch bug-124177-20131113110119.patch text/plain 9455 oliver U3VidmVyc2lvbiBSZXZpc2lvbjogMTU5MjA5CmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCBi YTQ0YzU5YmJhNzMxZjgwNjIxNzJhNDA5ZjhjMTg1OThjNWMxM2Q0Li45NjUyZDMzNzQwZWQ4YmZk MjFkOWE1ZDRjZDNjOTJjOWVjN2Q0OTVhIDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs 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