Extended Description

$ clang-trunk -v
clang version 13.0.0 (https://github.com/llvm/llvm-project.git2e9c75d)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/cnsun/usr/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/9
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@MX32
Selected multilib: .;@m64

$ cat mutant.c
main() { _Generic(n(_Generic(n++, int : 0)), int : 0); }

$ clang-trunk mutant.c
mutant.c:1:1: warning: type specifier missing, defaults to 'int' [-Wimplicit-int]
main() { _Generic(n(_Generic(n++, int : 0)), int : 0); }
^
mutant.c:1:19: warning: implicit declaration of function 'n' is invalid in C99 [-Wimplicit-function-declaration]
main() { _Generic(n(_Generic(n++, int : 0)), int : 0); }
^
mutant.c:1:31: error: cannot increment value of type 'int ()'
main() { _Generic(n(_Generic(n++, int : 0)), int : 0); }
~^
clang-13: /tmp/tmp.xjN6dMkdrg-clang-builder/llvm-project/clang/include/clang/AST/Expr.h:5778: unsigned int clang::GenericSelectionExpr::getResultIndex() const: Assertion `!isResultDependent() && "Generic selection is result-dependent but getResultIndex called!"' failed.
PLEASE submit a bug report tohttps://bugs.llvm.org/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.Program arguments: /scratch/software/clang-trunk/bin/clang-13 -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all --mrelax-relocations -disable-free -main-file-name mutant.c -mrelocation-model static -mframe-pointer=all -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/scratch/cnsun/workspace/perses-fuzzer/default_c_finding_folder/crash_20210626_162408_09d9/delta/perses_result -resource-dir /scratch/software/clang-trunk/lib/clang/13.0.0 -c-isystem . -c-isystem /usr/local/include/cmsith -internal-isystem /scratch/software/clang-trunk/lib/clang/13.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fdebug-compilation-dir=/scratch/cnsun/workspace/perses-fuzzer/default_c_finding_folder/crash_20210626_162408_09d9/delta/perses_result -ferror-limit 19 -fgnuc-version=4.2.1 -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/mutant-3d868c.o -x c mutant.c

1. mutant.c:1:54: current parser token ';'
2. mutant.c:1:8: parsing function body 'main'
3. mutant.c:1:8: in compound statement ('{}')
   #​0 0x0000557053e10184 PrintStackTraceSignalHandler(void*) Signals.cpp:0:0
   #​1 0x0000557053e0d93e SignalHandler(int) Signals.cpp:0:0
   #​2 0x00007f940d3bd3c0 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x153c0)
   #​3 0x00007f940ce5c18b raise /build/glibc-ZN95T4/glibc-2.31/signal/../sysdeps/unix/sysv/linux/raise.c:51:1
   #​4 0x00007f940ce3b859 abort /build/glibc-ZN95T4/glibc-2.31/stdlib/abort.c:81:7
   #​5 0x00007f940ce3b729 get_sysdep_segment_value /build/glibc-ZN95T4/glibc-2.31/intl/loadmsgcat.c:509:8
   #​6 0x00007f940ce3b729 _nl_load_domain /build/glibc-ZN95T4/glibc-2.31/intl/loadmsgcat.c:970:34
   #​7 0x00007f940ce4cf36 (/lib/x86_64-linux-gnu/libc.so.6+0x36f36)
   #​8 0x0000557056ec6819 (/scratch/software/clang-trunk/bin/clang-13+0x6a11819)
   #​9 0x0000557056ece1f9 clang::Expr::HasSideEffects(clang::ASTContext const&, bool) const (/scratch/software/clang-trunk/bin/clang-13+0x6a191f9)
   #​10 0x0000557056ecdee3 clang::Expr::HasSideEffects(clang::ASTContext const&, bool) const (/scratch/software/clang-trunk/bin/clang-13+0x6a18ee3)
   #​11 0x00005570564b2b8f clang::Sema::CreateGenericSelectionExpr(clang::SourceLocation, clang::SourceLocation, clang::SourceLocation, clang::Expr*, llvm::ArrayRefclang::TypeSourceInfo*, llvm::ArrayRefclang::Expr*) (/scratch/software/clang-trunk/bin/clang-13+0x5ffdb8f)
   #​12 0x00005570564ce936 clang::Sema::ActOnGenericSelectionExpr(clang::SourceLocation, clang::SourceLocation, clang::SourceLocation, clang::Expr*, llvm::ArrayRef<clang::OpaquePtrclang::QualType >, llvm::ArrayRefclang::Expr*) (/scratch/software/clang-trunk/bin/clang-13+0x6019936)
   #​13 0x000055705608411b clang::Parser::ParseGenericSelectionExpression() (/scratch/software/clang-trunk/bin/clang-13+0x5bcf11b)
   #​14 0x0000557056081b2f clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/scratch/software/clang-trunk/bin/clang-13+0x5bccb2f)
   #​15 0x000055705608350b clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/scratch/software/clang-trunk/bin/clang-13+0x5bce50b)
   #​16 0x00005570560835ad clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/scratch/software/clang-trunk/bin/clang-13+0x5bce5ad)
   #​17 0x0000557056086b0d clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/scratch/software/clang-trunk/bin/clang-13+0x5bd1b0d)
   #​18 0x00005570560ee74e clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/scratch/software/clang-trunk/bin/clang-13+0x5c3974e)
   #​19 0x00005570560e5ce2 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributesWithRange&) (/scratch/software/clang-trunk/bin/clang-13+0x5c30ce2)
   #​20 0x00005570560e66ca clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/scratch/software/clang-trunk/bin/clang-13+0x5c316ca)
   #​21 0x00005570560e7649 clang::Parser::ParseCompoundStatementBody(bool) (/scratch/software/clang-trunk/bin/clang-13+0x5c32649)
   #​22 0x00005570560e9c5a clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/scratch/software/clang-trunk/bin/clang-13+0x5c34c5a)
   #​23 0x000055705602fef2 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/scratch/software/clang-trunk/bin/clang-13+0x5b7aef2)
   #​24 0x000055705605c850 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/scratch/software/clang-trunk/bin/clang-13+0x5ba7850)
   #​25 0x000055705602a6f6 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributesWithRange&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/scratch/software/clang-trunk/bin/clang-13+0x5b756f6)
   #​26 0x000055705602ace1 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributesWithRange&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (.part.0) Parser.cpp:0:0
   #​27 0x00005570560314e7 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributesWithRange&, clang::ParsingDeclSpec*) (/scratch/software/clang-trunk/bin/clang-13+0x5b7c4e7)
   #​28 0x0000557056032a7e clang::Parser::ParseTopLevelDecl(clang::OpaquePtrclang::DeclGroupRef&, bool) (/scratch/software/clang-trunk/bin/clang-13+0x5b7da7e)
   #​29 0x0000557056032e29 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtrclang::DeclGroupRef&) (/scratch/software/clang-trunk/bin/clang-13+0x5b7de29)
   #​30 0x000055705602529a clang::ParseAST(clang::Sema&, bool, bool) (/scratch/software/clang-trunk/bin/clang-13+0x5b7029a)
   #​31 0x0000557054f6c968 clang::CodeGenAction::ExecuteAction() (/scratch/software/clang-trunk/bin/clang-13+0x4ab7968)
   #​32 0x000055705481c599 clang::FrontendAction::Execute() (/scratch/software/clang-trunk/bin/clang-13+0x4367599)
   #​33 0x00005570547af7e6 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/scratch/software/clang-trunk/bin/clang-13+0x42fa7e6)
   #​34 0x00005570548fa480 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/scratch/software/clang-trunk/bin/clang-13+0x4445480)
   #​35 0x000055705171a696 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/scratch/software/clang-trunk/bin/clang-13+0x1265696)
   #​36 0x00005570517169d8 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) driver.cpp:0:0
   #​37 0x00005570516440e6 main (/scratch/software/clang-trunk/bin/clang-13+0x118f0e6)
   #​38 0x00007f940ce3d0b3 __libc_start_main /build/glibc-ZN95T4/glibc-2.31/csu/../csu/libc-start.c:342:3
   #​39 0x000055705171654e _start (/scratch/software/clang-trunk/bin/clang-13+0x126154e)
   clang-13: error: unable to execute command: Aborted (core dumped)
   clang-13: error: clang frontend command failed due to signal (use -v to see invocation)
   clang version 13.0.0 (https://github.com/llvm/llvm-project.git2e9c75d)
   Target: x86_64-unknown-linux-gnu
   Thread model: posix
   InstalledDir: /home/cnsun/usr/bin
   clang-13: note: diagnostic msg:

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-13: note: diagnostic msg: /tmp/mutant-32b756.c
clang-13: note: diagnostic msg: /tmp/mutant-32b756.sh
clang-13: note: diagnostic msg: