146029 2015-06-16 15:16:04 -0700 Inlining in the DFG trashes ByteCodeParser::m_currentInstruction for the calling function 2015-06-16 17:06:51 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All RESOLVED FIXED InRadar P2 Normal --- 1 msaboff msaboff webkit-bug-importer oldest_to_newest 1102356 0 msaboff 2015-06-16 15:16:04 -0700 When we inline a function call in the DFG, we essential recurse in ByteCodeParser::attemptToInlineCall() when we call inlineCall(). In the process we overwrite m_currentInstruction. When we return, m_currentInstruction no longer points at the call instruction. The fix is to save and restore m_currentInstruction around the call to inlineCall(). <rdar://problem/20841734> 1102381 1 254975 msaboff 2015-06-16 16:22:03 -0700 Created attachment 254975 Patch 1102384 2 254975 benjamin 2015-06-16 16:43:09 -0700 Comment on attachment 254975 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=254975&action=review > Source/JavaScriptCore/ChangeLog:7 > + IMHO, you should explain the bug here. How/where m_currentInstruction is trashed, and what were the side effects. 1102386 3 254975 mark.lam 2015-06-16 16:44:41 -0700 Comment on attachment 254975 Patch r=me too 1102389 4 msaboff 2015-06-16 16:50:45 -0700 (In reply to comment #2) > Comment on attachment 254975 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=254975&action=review > > > Source/JavaScriptCore/ChangeLog:7 > > + > > IMHO, you should explain the bug here. How/where m_currentInstruction is > trashed, and what were the side effects. I'll add comments explaining how this happens. 1102401 5 msaboff 2015-06-16 17:06:51 -0700 Committed r185627: <http://trac.webkit.org/changeset/185627> 254975 2015-06-16 16:22:03 -0700 2015-06-16 16:43:09 -0700 Patch 146029.patch text/plain 4875 msaboff SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTg1NjIyKQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDE3IEBA CisyMDE1LTA2LTE2ICBNaWNoYWVsIFNhYm9mZiAgPG1zYWJvZmZAYXBwbGUuY29tPgorCisgICAg ICAgIElubGluaW5nIGluIHRoZSBERkcgdHJhc2hlcyBCeXRlQ29kZVBhcnNlcjo6bV9jdXJyZW50 SW5zdHJ1Y3Rpb24gZm9yIHRoZSBjYWxsaW5nIGZ1bmN0aW9uCisgICAgICAgIGh0dHBzOi8vYnVn cy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0xNDYwMjkKKworICAgICAgICBSZXZpZXdlZCBi eSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICBTYXZlIGFuZCByZXN0b3JlIG1fY3VycmVudElu 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