[llvm-bugs] [Bug 31996] New: [Windows] sema forgot to instantiate default args

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=31996

            Bug ID: 31996
           Summary: [Windows] sema forgot to instantiate default args
           Product: clang
           Version: 3.9
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: eric at andante.org
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

Created attachment 18002
  --> https://bugs.llvm.org/attachment.cgi?id=18002&action=edit
Zip file containing the cpp output and the .sh file that was written to the
temp directory.

If I compile the enclosed testcase, then clang crashes.  I see this both with
prebuilt binaries and with the binaries that I built myself.

The failure is:
Assertion failed: DefaultArg && "sema forgot to instantiate default args", file
D:\Users\eyoungdale\work\llvm390\llvm-3.9.1.src\tools\clang\lib\CodeGen\MicrosoftCXXABI.cpp,
line 3871

My stacktrace is:
0:000> k
ChildEBP RetAddr  
00c2ad80 0f93f7f9 clang!HandleAbort+0x9
[d:\users\eyoungdale\work\llvm390\llvm-3.9.1.src\lib\support\windows\signals.inc
@ 404]
WARNING: Stack unwind information not available. Following frames may be wrong.
00c2addc 0f94b284 MSVCR120D!raise+0x2b9
00c2adec 0f939ac4 MSVCR120D!abort+0x34
00c2b930 021d3674 MSVCR120D!wassert+0xd4
00c2c7e0 021ca7be clang!`anonymous
namespace'::MicrosoftCXXABI::getAddrOfCXXCtorClosure+0x634
[d:\users\eyoungdale\work\llvm390\llvm-3.9.1.src\tools\clang\lib\codegen\microsoftcxxabi.cpp
@ 3871]
00c2c7fc 01f9db58 clang!`anonymous
namespace'::MicrosoftCXXABI::EmitCXXConstructors+0x8e
[d:\users\eyoungdale\work\llvm390\llvm-3.9.1.src\tools\clang\lib\codegen\microsoftcxxabi.cpp
@ 1196]
00c2d240 047ae98e clang!clang::CodeGen::CodeGenModule::EmitTopLevelDecl+0x2d8
[d:\users\eyoungdale\work\llvm390\llvm-3.9.1.src\tools\clang\lib\codegen\codegenmodule.cpp
@ 3815]
00c2d26c 047ac5b5 clang!`anonymous
namespace'::CodeGeneratorImpl::HandleTopLevelDecl+0x8e
[d:\users\eyoungdale\work\llvm390\llvm-3.9.1.src\tools\clang\lib\codegen\modulebuilder.cpp
@ 148]
00c2d2b0 03c113a6 clang!clang::BackendConsumer::HandleTopLevelDecl+0x85
[d:\users\eyoungdale\work\llvm390\llvm-3.9.1.src\tools\clang\lib\codegen\codegenaction.cpp
@ 119]
00c2d5a4 03c10000 clang!clang::Sema::InstantiateFunctionDefinition+0x976
[d:\users\eyoungdale\work\llvm390\llvm-3.9.1.src\tools\clang\lib\sema\sematemplateinstantiatedecl.cpp
@ 3697]
00c2d624 03c113dc clang!clang::Sema::PerformPendingInstantiations+0x110
[d:\users\eyoungdale\work\llvm390\llvm-3.9.1.src\tools\clang\lib\sema\sematemplateinstantiatedecl.cpp
@ 4896]
00c2d918 03c10000 clang!clang::Sema::InstantiateFunctionDefinition+0x9ac
[d:\users\eyoungdale\work\llvm390\llvm-3.9.1.src\tools\clang\lib\sema\sematemplateinstantiatedecl.cpp
@ 3715]
00c2d998 03504883 clang!clang::Sema::PerformPendingInstantiations+0x110
[d:\users\eyoungdale\work\llvm390\llvm-3.9.1.src\tools\clang\lib\sema\sematemplateinstantiatedecl.cpp
@ 4896]
00c2dde4 0323b4c4 clang!clang::Sema::ActOnEndOfTranslationUnit+0x143
[d:\users\eyoungdale\work\llvm390\llvm-3.9.1.src\tools\clang\lib\sema\sema.cpp
@ 688]
00c2de5c 0323920f clang!clang::Parser::ParseTopLevelDecl+0x224
[d:\users\eyoungdale\work\llvm390\llvm-3.9.1.src\tools\clang\lib\parse\parser.cpp
@ 585]
00c2def8 024c12b1 clang!clang::ParseAST+0x1df
[d:\users\eyoungdale\work\llvm390\llvm-3.9.1.src\tools\clang\lib\parse\parseast.cpp
@ 160]
00c2df1c 047a8768 clang!clang::ASTFrontendAction::ExecuteAction+0x101
[d:\users\eyoungdale\work\llvm390\llvm-3.9.1.src\tools\clang\lib\frontend\frontendaction.cpp
@ 557]
00c2e110 024c0e74 clang!clang::CodeGenAction::ExecuteAction+0x478
[d:\users\eyoungdale\work\llvm390\llvm-3.9.1.src\tools\clang\lib\codegen\codegenaction.cpp
@ 854]
00c2e140 0246de6d clang!clang::FrontendAction::Execute+0x84
[d:\users\eyoungdale\work\llvm390\llvm-3.9.1.src\tools\clang\lib\frontend\frontendaction.cpp
@ 457]
00c2e1d4 025bc30b clang!clang::CompilerInstance::ExecuteAction+0x35d
[d:\users\eyoungdale\work\llvm390\llvm-3.9.1.src\tools\clang\lib\frontend\compilerinstance.cpp
@ 868]
00c2e2a0 00d574dd clang!clang::ExecuteCompilerInvocation+0x3eb
[d:\users\eyoungdale\work\llvm390\llvm-3.9.1.src\tools\clang\lib\frontendtool\executecompilerinvocation.cpp
@ 241]
00c2e7cc 00d438f8 clang!cc1_main+0x38d
[d:\users\eyoungdale\work\llvm390\llvm-3.9.1.src\tools\clang\tools\driver\cc1_main.cpp
@ 116]
00c2e800 00d43f63 clang!ExecuteCC1Tool+0x78
[d:\users\eyoungdale\work\llvm390\llvm-3.9.1.src\tools\clang\tools\driver\driver.cpp
@ 301]
00c2f75c 045d5cb9 clang!main+0x5c3
[d:\users\eyoungdale\work\llvm390\llvm-3.9.1.src\tools\clang\tools\driver\driver.cpp
@ 382]

I also have a minidump that I got from the prebuilt binary - that seems less
useful unless somebody has debug symbols tucked away somewhere.

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