[llvm-bugs] [Bug 30664] New: ToT clang crashes in Sema::InstantiateMemInitializers

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30664

            Bug ID: 30664
           Summary: ToT clang crashes in Sema::InstantiateMemInitializers
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: vsk at apple.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 17425
  --> https://llvm.org/bugs/attachment.cgi?id=17425&action=edit
Reduced reproducer

Reduced example:

$ clang -std=c++11 -c crash.cc -o /dev/null

struct outer {
  struct inner {
    const outer &o;
    inner() : o({}) {}
  };
};

outer::inner i;

##    frame #4: 0x000000010b8e8f00
libclangSema.dylib`clang::FunctionDecl::getParamDecl(this=0x0000000114017930,
i=0) const + 112 at Decl.h:2012
##    frame #5: 0x000000010bd6cb79
libclangSema.dylib`clang::Sema::PerformImplicitConversion(this=0x0000000112870800,
From=0x00000001140178a0, ToType=QualType @ 0x00007fff5fbf5668,
ICS=0x0000000112405000, Action=AA_Initializing, CCK=CCK_ImplicitConversion) +
473 at SemaExprCXX.cpp:3421
##    frame #6: 0x000000010be6c408
libclangSema.dylib`clang::InitializationSequence::Perform(this=0x00007fff5fbf6d38,
S=0x0000000112870800, Entity=0x00007fff5fbf6c58, Kind=0x00007fff5fbf6c48,
Args=clang::MultiExprArg @ 0x00007fff5fbf68f0, ResultType=0x0000000000000000) +
10472 at SemaInit.cpp:6658
##    frame #7: 0x000000010bada064
libclangSema.dylib`clang::Sema::BuildMemberInitializer(this=0x0000000112870800,
Member=0x0000000114016ef0, Init=0x00000001140178e0, IdLoc=(ID = 180156)) + 1236
at SemaDeclCXX.cpp:3876
##    frame #8: 0x000000010c2494b0
libclangSema.dylib`clang::Sema::InstantiateMemInitializers(this=0x0000000112870800,
New=0x0000000114016f78, Tmpl=0x000000011292f9e8,
TemplateArgs=0x00007fff5fbf8b98) + 2352 at SemaTemplateInstantiateDecl.cpp:4395
##    frame #9: 0x000000010c248493
libclangSema.dylib`clang::Sema::InstantiateFunctionDefinition(this=0x0000000112870800,
PointOfInstantiation=(ID = 180186), Function=0x0000000114016f78,
Recursive=true, DefinitionRequired=false, AtEndOfTU=true) + 3587 at
SemaTemplateInstantiateDecl.cpp:3708
##    frame #10: 0x000000010c23fc05
libclangSema.dylib`clang::Sema::PerformPendingInstantiations(this=0x0000000112870800,
LocalOnly=false) + 949 at SemaTemplateInstantiateDecl.cpp:4927
##    frame #11: 0x000000010b82fb46
libclangSema.dylib`clang::Sema::ActOnEndOfTranslationUnit(this=0x0000000112870800)
+ 726 at Sema.cpp:684
##    frame #12: 0x000000010b59ee29
libclangParse.dylib`clang::Parser::ParseTopLevelDecl(this=0x0000000112873600,
Result=0x00007fff5fbf9b50) + 937 at Parser.cpp:617
##    frame #13: 0x000000010b47e2b0
libclangParse.dylib`clang::ParseAST(S=0x0000000112870800, PrintStats=false,
SkipFunctionBodies=false) + 960 at ParseAST.cpp:147
##    frame #14: 0x00000001082b0725
libclangFrontend.dylib`clang::ASTFrontendAction::ExecuteAction(this=0x000000011200cb70)
+ 485 at FrontendAction.cpp:557
##    frame #15: 0x0000000106eb62fc
libclangCodeGen.dylib`clang::CodeGenAction::ExecuteAction(this=0x000000011200cb70)
+ 7372 at CodeGenAction.cpp:869
##    frame #16: 0x00000001082af9c0
libclangFrontend.dylib`clang::FrontendAction::Execute(this=0x000000011200cb70)
+ 112 at FrontendAction.cpp:458
##    frame #17: 0x00000001081e86f6
libclangFrontend.dylib`clang::CompilerInstance::ExecuteAction(this=0x000000011200ba30,
Act=0x000000011200cb70) + 2278 at CompilerInstance.cpp:871
##    frame #18: 0x00000001087c0a15
libclangFrontendTool.dylib`clang::ExecuteCompilerInvocation(Clang=0x000000011200ba30)
+ 6021 at ExecuteCompilerInvocation.cpp:249
##    frame #19: 0x000000010001ef9a clang`cc1_main(Argv=ArrayRef<const char *>
@ 0x00007fff5fbfbfe0, Argv0="clang", MainAddr=0x000000010000ae00) + 4906 at
cc1_main.cpp:183
##    frame #20: 0x000000010000ee0e clang`ExecuteCC1Tool(argv=ArrayRef<const
char *> @ 0x00007fff5fbfce88, Tool=(Data = "", Length = 0)) + 622 at
driver.cpp:299

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