185110 2018-04-27 23:10:40 -0700 Apply PtrTags to the MetaAllocator and friends. 2018-04-30 15:30:03 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 mark.lam mark.lam fpizlo jfbastien keith_miller msaboff rmorisset saam webkit-bug-importer oldest_to_newest 1418772 0 mark.lam 2018-04-27 23:10:40 -0700 <rdar://problem/39533895> 1418775 1 339061 mark.lam 2018-04-28 00:00:55 -0700 Created attachment 339061 proposed patch. 1419055 2 339061 saam 2018-04-30 11:23:55 -0700 Comment on attachment 339061 proposed patch. View in context: https://bugs.webkit.org/attachment.cgi?id=339061&action=review r=me > Source/JavaScriptCore/jit/ExecutableAllocator.cpp:306 > +#else // !(CPU(ARM64) && USE(EXECUTE_ONLY_JIT_WRITE_FUNCTION)) Why this change? I thought we typically annotate w/ the identical condition, not its opposite? > Source/JavaScriptCore/jit/ExecutableAllocator.cpp:445 > + RELEASE_ASSERT(start < resultEnd && resultEnd <= end); I guess it's ok to we assume we always generate > 0 bytes of code? > Source/WTF/wtf/MetaAllocator.cpp:342 > + ASSERT(leftNode->m_start + (leftNode->sizeInBytes() + sizeInBytes + rightSize) == rightEnd); Why parenthesis here? > Source/WTF/wtf/MetaAllocator.cpp:350 > + leftNode->m_end += (sizeInBytes + rightSize); ditto > Source/WTF/wtf/MetaAllocator.cpp:368 > + ASSERT(start + (sizeInBytes + rightNode->sizeInBytes()) == rightNode->m_end); ditto > Source/WTF/wtf/MetaAllocator.cpp:383 > + node->m_end = start + sizeInBytes; And you don't use them here. I'd just remove it everywhere since addition is commutative. > Source/WTF/wtf/MetaAllocator.h:141 > + return m_end.untaggedPtr<size_t>() - m_start.untaggedPtr<size_t>(); This should be untaggedPtr<uintptr_t> or untaggedPtr<intptr_t> IMO > Source/WTF/wtf/MetaAllocatorPtr.h:35 > +class MetaAllocatorPtr { This is almost identical to MacroAssemblerCodePtr. They should probably inherit from some common subclass. At least file a bug w/ a FIXME for this work. 1419141 3 339061 mark.lam 2018-04-30 15:20:30 -0700 Comment on attachment 339061 proposed patch. View in context: https://bugs.webkit.org/attachment.cgi?id=339061&action=review >> Source/JavaScriptCore/jit/ExecutableAllocator.cpp:306 >> +#else // !(CPU(ARM64) && USE(EXECUTE_ONLY_JIT_WRITE_FUNCTION)) > > Why this change? I thought we typically annotate w/ the identical condition, not its opposite? I'll revert this. I still think our typical convention is confusing to annotate a block of code with the opposite of what it contains. >> Source/JavaScriptCore/jit/ExecutableAllocator.cpp:445 >> + RELEASE_ASSERT(start < resultEnd && resultEnd <= end); > > I guess it's ok to we assume we always generate > 0 bytes of code? I think it doesn't make sense to ask the allocator for 0 bytes. >> Source/WTF/wtf/MetaAllocator.cpp:342 >> + ASSERT(leftNode->m_start + (leftNode->sizeInBytes() + sizeInBytes + rightSize) == rightEnd); > > Why parenthesis here? I already talked to Saam about this offline: the reason for the parens is so explicitly communicate to the compiler that we want the scalar operations to be executed first, and then only invoke MetaAllocatorPtr::operator+ once. >> Source/WTF/wtf/MetaAllocator.cpp:383 >> + node->m_end = start + sizeInBytes; > > And you don't use them here. I'd just remove it everywhere since addition is commutative. There's no order ambiguity here as to when to execute the MetaAllocatorPtr operator+. So, parens are not needed. >> Source/WTF/wtf/MetaAllocator.h:141 >> + return m_end.untaggedPtr<size_t>() - m_start.untaggedPtr<size_t>(); > > This should be untaggedPtr<uintptr_t> or untaggedPtr<intptr_t> IMO The return type of sizeInBytes() is size_t. So, I think we should be operating on size_t, not uintptr_t or intptr_t. >> Source/WTF/wtf/MetaAllocatorPtr.h:35 >> +class MetaAllocatorPtr { > > This is almost identical to MacroAssemblerCodePtr. They should probably inherit from some common subclass. At least file a bug w/ a FIXME for this work. Will add a FIXME and reference to https://bugs.webkit.org/show_bug.cgi?id=185145. 1419147 4 mark.lam 2018-04-30 15:30:03 -0700 Thanks for the review. Landed in r231175: <http://trac.webkit.org/r231175>. 339061 2018-04-28 00:00:55 -0700 2018-04-30 11:23:55 -0700 proposed patch. bug-185110.patch text/plain 69654 mark.lam SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMjMxMTMxKQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDUxIEBA CisyMDE4LTA0LTI3ICBNYXJrIExhbSAgPG1hcmsubGFtQGFwcGxlLmNvbT4KKworICAgICAgICBB cHBseSBQdHJUYWdzIHRvIHRoZSBNZXRhQWxsb2NhdG9yIGFuZCBmcmllbmRzLgorICAgICAgICBo dHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MTg1MTEwCisgICAgICAgIDxy ZGFyOi8vcHJvYmxlbS8zOTUzMzg5NT4KKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9P UFMhKS4KKworICAgICAgICAxLiBMaW5rQnVmZmVyIG5vdyB0YWtlcyBhIE1hY3JvQXNzZW1ibGVy Q29kZVB0ciBpbnN0ZWFkIG9mIGEgdm9pZCogcG9pbnRlci4KKyAgICAgICAgMi4gQXBwbHkgcG9p 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