[llvm-bugs] [Bug 46477] New: Clang crashed in "clang::Sema::ActOnEnumBody()"

Fri Jun 26 20:41:16 PDT 2020

https://bugs.llvm.org/show_bug.cgi?id=46477

            Bug ID: 46477
           Summary: Clang crashed in "clang::Sema::ActOnEnumBody()"
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: haoxintu at gmail.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

This code, bug.cc ,reduce by C-Reduce, makes clang-trunk crashed.

$cat bug.cc
long a enum : decltype(0 = a)::b {

$clang++ bug.cc
bug.cc:1:7: error: expected ';' after top level declarator
long a enum : decltype(0 = a)::b {
      ^
      ;
bug.cc:1:26: error: expression is not assignable
long a enum : decltype(0 = a)::b {
                       ~ ^
bug.cc:1:15: error: missing 'typename' prior to dependent type name
'decltype(<recovery-expr>(0, a))::b'
long a enum : decltype(0 = a)::b {
              ^~~~~~~~~~~~~~~~~~
              typename 
bug.cc:1:35: error: expected identifier
long a enum : decltype(0 = a)::b {
                                  ^
bug.cc:1:35: error: expected '}'
bug.cc:1:34: note: to match this '{'
long a enum : decltype(0 = a)::b {
                                 ^
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash
backtrace, preprocessed source, and associated run script.
Stack dump:
0.      Program arguments:
/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11
-cc1 -triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free
-disable-llvm-verifier -discard-value-names -main-file-name bug.cc
-mrelocation-model static -mframe-pointer=all -fmath-errno -fno-rounding-math
-mconstructor-aliases -munwind-tables -target-cpu x86-64 -dwarf-column-info
-fno-split-dwarf-inlining -debugger-tuning=gdb -resource-dir
/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/lib/clang/11.0.0
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/x86_64-linux-gnu/c++/5.4.0
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/x86_64-linux-gnu/c++/5.4.0
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/backward
-internal-isystem /usr/local/include -internal-isystem
/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/lib/clang/11.0.0/include
-internal-externc-isystem /usr/include/x86_64-linux-gnu
-internal-externc-isystem /include -internal-externc-isystem /usr/include
-fdeprecated-macro -fdebug-compilation-dir
/home/haoxin/compilers/new-scg/new-scg-build/map_test/clang-test/creduce
-ferror-limit 19 -fgnuc-version=4.2.1 -fcxx-exceptions -fexceptions
-fcolor-diagnostics -faddrsig -o /tmp/bug-2d86d7.o -x c++ bug.cc 
1.      <eof> parser at end of file
 #0 0x000000000221f084 PrintStackTraceSignalHandler(void*)
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x221f084)
 #1 0x000000000221ce4e llvm::sys::RunSignalHandlers()
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x221ce4e)
 #2 0x000000000221f385 SignalHandler(int)
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x221f385)
 #3 0x00007fc760741390 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x11390)
 #4 0x0000000003f3cea2 clang::ASTContext::getTypeInfoImpl(clang::Type const*)
const
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x3f3cea2)
 #5 0x0000000003f3e183 clang::ASTContext::getTypeInfo(clang::Type const*) const
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x3f3e183)
 #6 0x0000000003f4f08d clang::ASTContext::getIntWidth(clang::QualType) const
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x3f4f08d)
 #7 0x00000000038a61c6 clang::Sema::ActOnEnumBody(clang::SourceLocation,
clang::SourceRange, clang::Decl*, llvm::ArrayRef<clang::Decl*>, clang::Scope*,
clang::ParsedAttributesView const&)
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x38a61c6)
 #8 0x0000000003690c39 clang::Parser::ParseEnumBody(clang::SourceLocation,
clang::Decl*)
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x3690c39)
 #9 0x000000000368d722 clang::Parser::ParseEnumSpecifier(clang::SourceLocation,
clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&,
clang::AccessSpecifier, clang::Parser::DeclSpecContext)
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x368d722)
#10 0x00000000036849b0
clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&,
clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier,
clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*)
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x36849b0)
#11 0x000000000366ecfa
clang::Parser::ParseDeclOrFunctionDefInternal(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec&, clang::AccessSpecifier)
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x366ecfa)
#12 0x000000000366eab5
clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*, clang::AccessSpecifier)
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x366eab5)
#13 0x000000000366daf6
clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*)
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x366daf6)
#14 0x000000000366bdff
clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, bool)
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x366bdff)
#15 0x0000000003667bfd clang::ParseAST(clang::Sema&, bool, bool)
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x3667bfd)
#16 0x0000000002931887 clang::FrontendAction::Execute()
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x2931887)
#17 0x00000000028ca6b1
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x28ca6b1)
#18 0x00000000029cab0c
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x29cab0c)
#19 0x000000000093747b cc1_main(llvm::ArrayRef<char const*>, char const*,
void*)
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x93747b)
#20 0x0000000000935c91 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&)
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x935c91)
#21 0x0000000000935a49 main
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x935a49)
#22 0x00007fc75f296830 __libc_start_main
/build/glibc-LK5gWL/glibc-2.23/csu/../csu/libc-start.c:325:0
#23 0x0000000000932c89 _start
(/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin/clang-11+0x932c89)
clang-11: error: unable to execute command: Segmentation fault (core dumped)
clang-11: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 11.0.0 
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir:
/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin
clang-11: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-11: note: diagnostic msg: /tmp/bug-2157c0.cpp
clang-11: note: diagnostic msg: /tmp/bug-2157c0.sh
clang-11: note: diagnostic msg: 

********************

$clang++ --version
clang version 11.0.0 
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir:
/home/haoxin/corpus-compilers/llvm-trunk/llvm-project-master/build/bin

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