Review Request 126154: Clang: fix crash when editing variadic template "recursive" class

Thu Jan 7 12:22:41 UTC 2016

> On Gru 21, 2015, 9:39 rano, Gleb Popov wrote:
> > I was able to reproduce your problem, but your patch doesn't fix it for me. Any ideas?

Can you provide me a sample code that triggers it for you? or a callstack when it crashes?

- Maciej

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On Lis 25, 2015, 10:16 rano, Maciej Cencora wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/126154/
> -----------------------------------------------------------
> 
> (Updated Lis 25, 2015, 10:16 rano)
> 
> 
> Review request for KDevelop.
> 
> 
> Repository: kdevelop
> 
> 
> Description
> -------
> 
> The crash cannot be reproduced on completion, only when editing such class.
> To reproduce:
> 1) create and save file with following content
> template <typename Head, typename ...Tail>
> struct my_class : Head, my_class<Tail...>
> {
>     using base = Head;
> };
> 2) in line with 'using' statement, mark the 'Head' text
> 3) delete text
> 4) write something (e.g. press letter 'a')
> 
> Not sure whether this is proper fix, but backtrace shows infinite recursion.
> #0  clang::operator<< (OS=..., N=...) at /build/llvm-toolchain-3.6-18MJNr/llvm-toolchain-3.6-3.6.2/tools/clang/lib/AST/DeclarationName.cpp:136
> #1  0x00007fff7d266e9d in clang::NamedDecl::printName (this=<optimized out>, os=...) at /build/llvm-toolchain-3.6-18MJNr/llvm-toolchain-3.6-3.6.2/tools/clang/tools/libclang/../../include/clang/AST/Decl.h:150
> #2  getDeclSpelling (D=0x7fff9403bd00) at /build/llvm-toolchain-3.6-18MJNr/llvm-toolchain-3.6-3.6.2/tools/clang/tools/libclang/CIndex.cpp:3491
> #3  0x00007fff7d267686 in clang_getCursorSpelling (C=...) at /build/llvm-toolchain-3.6-18MJNr/llvm-toolchain-3.6-3.6.2/tools/clang/tools/libclang/CIndex.cpp:3625
> #4  0x00007fff7deb2e51 in (anonymous namespace)::baseClassVisitor (cursor=..., parent=..., data=0x7fff7c8f5090) at /home/mcencora/tmp/kdevelop/languages/clang/codecompletion/completionhelper.cpp:158
> #5  0x00007fff7d259add in clang::cxcursor::CursorVisitor::Visit (this=this at entry=0x7fff7c8f4f10, Cursor=..., CheckedRegionOfInterest=CheckedRegionOfInterest at entry=false)
>     at /build/llvm-toolchain-3.6-18MJNr/llvm-toolchain-3.6-3.6.2/tools/clang/tools/libclang/CIndex.cpp:210
> #6  0x00007fff7d25bc34 in clang::cxcursor::CursorVisitor::VisitTemplateParameters (this=this at entry=0x7fff7c8f4f10, Params=<optimized out>) at /build/llvm-toolchain-3.6-18MJNr/llvm-toolchain-3.6-3.6.2/tools/clang/tools/libclang/CIndex.cpp:1321
> #7  0x00007fff7d259235 in clang::cxcursor::CursorVisitor::VisitClassTemplateDecl (this=0x7fff7c8f4f10, D=0x7fff9403bef0) at /build/llvm-toolchain-3.6-18MJNr/llvm-toolchain-3.6-3.6.2/tools/clang/tools/libclang/CIndex.cpp:903
> #8  0x00007fff7d2595db in clang::cxcursor::CursorVisitor::VisitChildren (this=this at entry=0x7fff7c8f4f10, Cursor=...) at /build/llvm-toolchain-3.6-18MJNr/llvm-toolchain-3.6-3.6.2/tools/clang/tools/libclang/CIndex.cpp:500
> #9  0x00007fff7d260024 in clang_visitChildren (parent=..., visitor=0x7fff7deb2ddf <(anonymous namespace)::baseClassVisitor(CXCursor, CXCursor, CXClientData)>, client_data=0x7fff7c8f5090)
>     at /build/llvm-toolchain-3.6-18MJNr/llvm-toolchain-3.6-3.6.2/tools/clang/tools/libclang/CIndex.cpp:3419
> #10 0x00007fff7deb2dac in (anonymous namespace)::processBaseClass (cursor=..., parent=..., functionList=0x7fff74003590) at /home/mcencora/tmp/kdevelop/languages/clang/codecompletion/completionhelper.cpp:148
> #11 0x00007fff7deb2f42 in (anonymous namespace)::baseClassVisitor (cursor=..., parent=..., data=0x7fff7c8f5580) at /home/mcencora/tmp/kdevelop/languages/clang/codecompletion/completionhelper.cpp:166
> #12 0x00007fff7d259add in clang::cxcursor::CursorVisitor::Visit (this=this at entry=0x7fff7c8f5400, Cursor=..., CheckedRegionOfInterest=CheckedRegionOfInterest at entry=false)
>     at /build/llvm-toolchain-3.6-18MJNr/llvm-toolchain-3.6-3.6.2/tools/clang/tools/libclang/CIndex.cpp:210
> #13 0x00007fff7d25919a in clang::cxcursor::CursorVisitor::VisitCXXRecordDecl (this=0x7fff7c8f5400, D=0x7fff9403be60) at /build/llvm-toolchain-3.6-18MJNr/llvm-toolchain-3.6-3.6.2/tools/clang/tools/libclang/CIndex.cpp:1672
> #14 0x00007fff7d2595db in clang::cxcursor::CursorVisitor::VisitChildren (this=this at entry=0x7fff7c8f5400, Cursor=...) at /build/llvm-toolchain-3.6-18MJNr/llvm-toolchain-3.6-3.6.2/tools/clang/tools/libclang/CIndex.cpp:500
> #15 0x00007fff7d260024 in clang_visitChildren (parent=..., visitor=0x7fff7deb2ddf <(anonymous namespace)::baseClassVisitor(CXCursor, CXCursor, CXClientData)>, client_data=0x7fff7c8f5580)
>     at /build/llvm-toolchain-3.6-18MJNr/llvm-toolchain-3.6-3.6.2/tools/clang/tools/libclang/CIndex.cpp:3419
> #16 0x00007fff7deb2dac in (anonymous namespace)::processBaseClass (cursor=..., parent=..., functionList=0x7fff74003590) at /home/mcencora/tmp/kdevelop/languages/clang/codecompletion/completionhelper.cpp:148
> #17 0x00007fff7deb2f42 in (anonymous namespace)::baseClassVisitor (cursor=..., parent=..., data=0x7fff7c8f5a70) at /home/mcencora/tmp/kdevelop/languages/clang/codecompletion/completionhelper.cpp:166
> #18 0x00007fff7d259add in clang::cxcursor::CursorVisitor::Visit (this=this at entry=0x7fff7c8f58f0, Cursor=..., CheckedRegionOfInterest=CheckedRegionOfInterest at entry=false)
>     at /build/llvm-toolchain-3.6-18MJNr/llvm-toolchain-3.6-3.6.2/tools/clang/tools/libclang/CIndex.cpp:210
> #19 0x00007fff7d25919a in clang::cxcursor::CursorVisitor::VisitCXXRecordDecl (this=0x7fff7c8f58f0, D=0x7fff9403be60) at /build/llvm-toolchain-3.6-18MJNr/llvm-toolchain-3.6-3.6.2/tools/clang/tools/libclang/CIndex.cpp:1672
> #20 0x00007fff7d2595db in clang::cxcursor::CursorVisitor::VisitChildren (this=this at entry=0x7fff7c8f58f0, Cursor=...) at /build/llvm-toolchain-3.6-18MJNr/llvm-toolchain-3.6-3.6.2/tools/clang/tools/libclang/CIndex.cpp:500
> #21 0x00007fff7d260024 in clang_visitChildren (parent=..., visitor=0x7fff7deb2ddf <(anonymous namespace)::baseClassVisitor(CXCursor, CXCursor, CXClientData)>, client_data=0x7fff7c8f5a70)
>     at /build/llvm-toolchain-3.6-18MJNr/llvm-toolchain-3.6-3.6.2/tools/clang/tools/libclang/CIndex.cpp:3419
> #22 0x00007fff7deb2dac in (anonymous namespace)::processBaseClass (cursor=..., parent=..., functionList=0x7fff74003590) at /home/mcencora/tmp/kdevelop/languages/clang/codecompletion/completionhelper.cpp:148
> #23 0x00007fff7deb2f42 in (anonymous namespace)::baseClassVisitor (cursor=..., parent=..., data=0x7fff7c8f5f60) at /home/mcencora/tmp/kdevelop/languages/clang/codecompletion/completionhelper.cpp:166
> #24 0x00007fff7d259add in clang::cxcursor::CursorVisitor::Visit (this=this at entry=0x7fff7c8f5de0, Cursor=..., CheckedRegionOfInterest=CheckedRegionOfInterest at entry=false)
>     at /build/llvm-toolchain-3.6-18MJNr/llvm-toolchain-3.6-3.6.2/tools/clang/tools/libclang/CIndex.cpp:210
> #25 0x00007fff7d25919a in clang::cxcursor::CursorVisitor::VisitCXXRecordDecl (this=0x7fff7c8f5de0, D=0x7fff9403be60) at /build/llvm-toolchain-3.6-18MJNr/llvm-toolchain-3.6-3.6.2/tools/clang/tools/libclang/CIndex.cpp:1672
> #26 0x00007fff7d2595db in clang::cxcursor::CursorVisitor::VisitChildren (this=this at entry=0x7fff7c8f5de0, Cursor=...) at /build/llvm-toolchain-3.6-18MJNr/llvm-toolchain-3.6-3.6.2/tools/clang/tools/libclang/CIndex.cpp:500
> #27 0x00007fff7d260024 in clang_visitChildren (parent=..., visitor=0x7fff7deb2ddf <(anonymous namespace)::baseClassVisitor(CXCursor, CXCursor, CXClientData)>, client_data=0x7fff7c8f5f60)
>     at /build/llvm-toolchain-3.6-18MJNr/llvm-toolchain-3.6-3.6.2/tools/clang/tools/libclang/CIndex.cpp:3419
> 
> ... and this goes on for 39K frames
> 
> 
> Diffs
> -----
> 
>   languages/clang/codecompletion/completionhelper.cpp ac307ef 
> 
> Diff: https://git.reviewboard.kde.org/r/126154/diff/
> 
> 
> Testing
> -------
> 
> Manual.
> 
> 
> Thanks,
> 
> Maciej Cencora
> 
>

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