[LLVMbugs] [Bug 6887] New: assertion failed: Default argument is not yet instantiated!

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=6887

           Summary: assertion failed: Default argument is not yet
                    instantiated!
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: nlewycky at google.com
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=4708)
 --> (http://llvm.org/bugs/attachment.cgi?id=4708)
testcase

This is a crash on valid during irgen. The attached example fails:

$ g++ -c 000.cc
$ clang++ -fsyntax-only 000.cc
$ clang++ -c -flto 000.cc
clang: Decl.cpp:821: clang::Expr* clang::ParmVarDecl::getDefaultArg():
Assertion `!hasUninstantiatedDefaultArg() && "Default argument is not yet
instantiated!"' failed.
0  clang           0x0000000001d0c092
1  clang           0x0000000001d0c57e
2  libpthread.so.0 0x00007f36497177d0
3  libc.so.6       0x00007f3648a3b095 gsignal + 53
4  libc.so.6       0x00007f3648a3caf0 abort + 272
5  libc.so.6       0x00007f3648a342df __assert_fail + 239
6  clang           0x00000000012fdfab clang::ParmVarDecl::getDefaultArg() + 137
7  clang           0x0000000000f792d1 clang::ParmVarDecl::getDefaultArg() const
+ 21
8  clang           0x0000000001015db6
9  clang           0x0000000001018b0b
clang::CodeGen::CodeGenFunction::EmitClassMemberwiseCopy(llvm::Value*,
llvm::Value*, clang::CXXRecordDecl const*, clang::CXXRecordDecl const*,
clang::QualType) + 269
10 clang           0x0000000001018fc4
clang::CodeGen::CodeGenFunction::SynthesizeCXXCopyConstructor(llvm::SmallVector<std::pair<clang::VarDecl
const*, clang::QualType>, 16u> const&) + 1206
11 clang           0x0000000001019439
clang::CodeGen::CodeGenFunction::EmitConstructorBody(llvm::SmallVector<std::pair<clang::VarDecl
const*, clang::QualType>, 16u>&) + 483
12 clang           0x0000000001001293
clang::CodeGen::CodeGenFunction::GenerateCode(clang::CodeGen::GlobalDecl,
llvm::Function*) + 1311
13 clang           0x0000000000f47ab0
clang::CodeGen::CodeGenModule::EmitCXXConstructor(clang::CXXConstructorDecl
const*, clang::CXXCtorType) + 270
14 clang           0x0000000000f1c4aa
clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::CodeGen::GlobalDecl)
+ 180
15 clang           0x0000000000f1ce56
clang::CodeGen::CodeGenModule::EmitDeferred() + 372
16 clang           0x0000000000f1d07b clang::CodeGen::CodeGenModule::Release()
+ 21
17 clang           0x0000000000f16927
18 clang           0x0000000000debb13
19 clang           0x0000000001020379 clang::ParseAST(clang::Preprocessor&,
clang::ASTConsumer*, clang::ASTContext&, bool, bool,
clang::CodeCompleteConsumer*) + 735
20 clang           0x0000000000e01c28 clang::ASTFrontendAction::ExecuteAction()
+ 256
21 clang           0x0000000000e01d25 clang::FrontendAction::Execute() + 239
22 clang           0x0000000000def724
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 706
23 clang           0x0000000000dd92cd cc1_main(char const**, char const**, char
const*, void*) + 1765
24 clang           0x0000000000dddf9f main + 251
25 libc.so.6       0x00007f3648a271c4 __libc_start_main + 244
26 clang           0x0000000000dd8179
Stack dump:
0.      Program arguments: /usr/local/google/home/nlewycky/llvm/Debug/bin/clang
-cc1 -triple x86_64-unknown-linux-gnu -emit-llvm-bc -disable-free
-main-file-name 000.cc -mrelocation-model static -mdisable-fp-elim
-mconstructor-aliases -munwind-tables -target-cpu x86-64 -resource-dir
/usr/local/google/home/nlewycky/llvm/Debug/lib/clang/1.5 -ferror-limit 19
-fmessage-length 80 -fexceptions -fgnu-runtime -fdiagnostics-show-option
-fcolor-diagnostics -o 000.o -x c++ 000.cc 
1.      <eof> parser at end of file
2.      Per-file LLVM IR generation
3.      000.cc:6:8: Generating code for declaration 'B::B'
clang: error: compiler command failed due to signal 6 (use -v to see
invocation)

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