https://llvm.org/bugs/show_bug.cgi?id=28171
Bug ID: 28171
Summary: clang crashes on C++ code with invalid access to a
non-existent member: Assertion `DerivationOkay && "Can
only be used with a derived-to-base conversion"'
failed
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: s...@cs.ucdavis.edu
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
Classification: Unclassified
The current clang trunk crashes when compiling the following C++ test case on
x86_64-linux-gnu in both 32-bit and 64-bit modes.
It seems to affect all clang versions since as early as 3.4.
$ clang++ -v
clang version 3.9.0 (trunk 272993)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$
$
$ clang++ -c small.cpp
clang-3.9:
/tmp/llvm-builder/llvm-source-trunk/tools/clang/lib/Sema/SemaDeclCXX.cpp:1765:
bool clang::Sema::CheckDerivedToBaseConversion(clang::QualType,
clang::QualType, unsigned int, unsigned int, clang::SourceLocation,
clang::SourceRange, clang::DeclarationName, clang::CXXCastPath*, bool):
Assertion `DerivationOkay && "Can only be used with a derived-to-base
conversion"' failed.
#0 0x0000000001d1b425 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/local/clang-trunk/bin/clang-3.9+0x1d1b425)
#1 0x0000000001d192b6 llvm::sys::RunSignalHandlers()
(/usr/local/clang-trunk/bin/clang-3.9+0x1d192b6)
#2 0x0000000001d194d4 SignalHandler(int)
(/usr/local/clang-trunk/bin/clang-3.9+0x1d194d4)
#3 0x00007fe5042f0340 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#4 0x00007fe50350ecc9 gsignal
/build/eglibc-3GlaMS/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x00007fe5035120d8 abort
/build/eglibc-3GlaMS/eglibc-2.19/stdlib/abort.c:91:0
#6 0x00007fe503507b86 __assert_fail_base
/build/eglibc-3GlaMS/eglibc-2.19/assert/assert.c:92:0
#7 0x00007fe503507c32 (/lib/x86_64-linux-gnu/libc.so.6+0x2fc32)
#8 0x0000000002b1f9a1
clang::Sema::CheckDerivedToBaseConversion(clang::QualType, clang::QualType,
unsigned int, unsigned int, clang::SourceLocation, clang::SourceRange,
clang::DeclarationName, llvm::SmallVector<clang::CXXBaseSpecifier*, 4u>*, bool)
(/usr/local/clang-trunk/bin/clang-3.9+0x2b1f9a1)
#9 0x0000000002b1f9e3
clang::Sema::CheckDerivedToBaseConversion(clang::QualType, clang::QualType,
clang::SourceLocation, clang::SourceRange,
llvm::SmallVector<clang::CXXBaseSpecifier*, 4u>*, bool)
(/usr/local/clang-trunk/bin/clang-3.9+0x2b1f9e3)
#10 0x0000000002b86aa1 clang::Sema::PerformObjectMemberConversion(clang::Expr*,
clang::NestedNameSpecifier*, clang::NamedDecl*, clang::NamedDecl*)
(/usr/local/clang-trunk/bin/clang-3.9+0x2b86aa1)
#11 0x0000000002c3c5aa BuildFieldReferenceExpr(clang::Sema&, clang::Expr*,
bool, clang::SourceLocation, clang::CXXScopeSpec const&, clang::FieldDecl*,
clang::DeclAccessPair, clang::DeclarationNameInfo const&)
(/usr/local/clang-trunk/bin/clang-3.9+0x2c3c5aa)
#12 0x0000000002c42848 clang::Sema::BuildMemberReferenceExpr(clang::Expr*,
clang::QualType, clang::SourceLocation, bool, clang::CXXScopeSpec const&,
clang::SourceLocation, clang::NamedDecl*, clang::LookupResult&,
clang::TemplateArgumentListInfo const*, clang::Scope const*, bool,
clang::Sema::ActOnMemberAccessExtraArgs*)
(/usr/local/clang-trunk/bin/clang-3.9+0x2c42848)
#13 0x0000000002c43b3c std::_Function_handler<clang::ActionResult<clang::Expr*,
true> (clang::Sema&, clang::TypoExpr*, clang::TypoCorrection),
LookupMemberExprInRecord(clang::Sema&, clang::LookupResult&, clang::Expr*,
clang::RecordType const*, clang::SourceLocation, bool, clang::CXXScopeSpec&,
bool, clang::TypoExpr*&)::{lambda(clang::Sema&, clang::TypoExpr*,
clang::TypoCorrection)#2}>::_M_invoke(std::_Any_data const&, clang::Sema&,
clang::TypoExpr*, clang::TypoCorrection)
(/usr/local/clang-trunk/bin/clang-3.9+0x2c43b3c)
#14 0x0000000002bfb3fd std::function<clang::ActionResult<clang::Expr*, true>
(clang::Sema&, clang::TypoExpr*,
clang::TypoCorrection)>::operator()(clang::Sema&, clang::TypoExpr*,
clang::TypoCorrection) const (/usr/local/clang-trunk/bin/clang-3.9+0x2bfb3fd)
#15 0x0000000002c1b079 clang::TreeTransform<(anonymous
namespace)::TransformTypos>::TransformExpr(clang::Expr*)
(/usr/local/clang-trunk/bin/clang-3.9+0x2c1b079)
#16 0x0000000002c28558 clang::TreeTransform<(anonymous
namespace)::TransformTypos>::TransformBinaryOperator(clang::BinaryOperator*)
(/usr/local/clang-trunk/bin/clang-3.9+0x2c28558)
#17 0x0000000002c1ae28 clang::TreeTransform<(anonymous
namespace)::TransformTypos>::TransformExpr(clang::Expr*)
(/usr/local/clang-trunk/bin/clang-3.9+0x2c1ae28)
#18 0x0000000002c1beb9 (anonymous
namespace)::TransformTypos::TryTransform(clang::Expr*)
(/usr/local/clang-trunk/bin/clang-3.9+0x2c1beb9)
#19 0x0000000002c1867d clang::Sema::CorrectDelayedTyposInExpr(clang::Expr*,
clang::VarDecl*, llvm::function_ref<clang::ActionResult<clang::Expr*, true>
(clang::Expr*)>) (/usr/local/clang-trunk/bin/clang-3.9+0x2c1867d)
#20 0x0000000002c19903 clang::Sema::ActOnFinishFullExpr(clang::Expr*,
clang::SourceLocation, bool, bool, bool)
(/usr/local/clang-trunk/bin/clang-3.9+0x2c19903)
#21 0x0000000002d430f0
clang::Sema::ActOnExprStmt(clang::ActionResult<clang::Expr*, true>)
(/usr/local/clang-trunk/bin/clang-3.9+0x2d430f0)
#22 0x0000000002874bbd clang::Parser::ParseExprStatement()
(/usr/local/clang-trunk/bin/clang-3.9+0x2874bbd)
#23 0x000000000287206f
clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::AllowedContsructsKind, clang::SourceLocation*,
clang::Parser::ParsedAttributesWithRange&)
(/usr/local/clang-trunk/bin/clang-3.9+0x287206f)
#24 0x00000000028721ce
clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::AllowedContsructsKind, clang::SourceLocation*)
(/usr/local/clang-trunk/bin/clang-3.9+0x28721ce)
#25 0x00000000028767b9 clang::Parser::ParseCompoundStatementBody(bool)
(/usr/local/clang-trunk/bin/clang-3.9+0x28767b9)
#26 0x0000000002879009 clang::Parser::ParseFunctionStatementBody(clang::Decl*,
clang::Parser::ParseScope&) (/usr/local/clang-trunk/bin/clang-3.9+0x2879009)
#27 0x00000000027f76eb
clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&,
clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*)
(/usr/local/clang-trunk/bin/clang-3.9+0x27f76eb)
#28 0x00000000028175dd clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&,
unsigned int, clang::SourceLocation*, clang::Parser::ForRangeInit*)
(/usr/local/clang-trunk/bin/clang-3.9+0x28175dd)
#29 0x00000000027f330d
clang::Parser::ParseDeclOrFunctionDefInternal(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec&, clang::AccessSpecifier)
(/usr/local/clang-trunk/bin/clang-3.9+0x27f330d)
#30 0x00000000027f39b1
clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*, clang::AccessSpecifier) [clone .part.222]
(/usr/local/clang-trunk/bin/clang-3.9+0x27f39b1)
#31 0x00000000027f39ef
clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*, clang::AccessSpecifier)
(/usr/local/clang-trunk/bin/clang-3.9+0x27f39ef)
#32 0x00000000027f8860
clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*) (/usr/local/clang-trunk/bin/clang-3.9+0x27f8860)
#33 0x00000000027f9030
clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&)
(/usr/local/clang-trunk/bin/clang-3.9+0x27f9030)
#34 0x00000000027f065b clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang-3.9+0x27f065b)
#35 0x0000000002486d3e clang::CodeGenAction::ExecuteAction()
(/usr/local/clang-trunk/bin/clang-3.9+0x2486d3e)
#36 0x00000000021977fe clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang-3.9+0x21977fe)
#37 0x000000000216d266
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang-3.9+0x216d266)
#38 0x00000000022245c2
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang-3.9+0x22245c2)
#39 0x0000000000af0548 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/usr/local/clang-trunk/bin/clang-3.9+0xaf0548)
#40 0x0000000000aa46dc main (/usr/local/clang-trunk/bin/clang-3.9+0xaa46dc)
#41 0x00007fe5034f9ec5 __libc_start_main
/build/eglibc-3GlaMS/eglibc-2.19/csu/libc-start.c:321:0
#42 0x0000000000aec5b4 _start (/usr/local/clang-trunk/bin/clang-3.9+0xaec5b4)
Stack dump:
0. Program arguments: /usr/local/clang-trunk/bin/clang-3.9 -cc1 -triple
x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free -main-file-name
small.cpp -mrelocation-model static -mthread-model posix -mdisable-fp-elim
-fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables
-fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb
-coverage-file /data2/small.cpp -resource-dir
/usr/local/clang-trunk/bin/../lib/clang/3.9.0 -internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../include/c++/4.9 -internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../include/x86_64-linux-gnu/c++/4.9
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../include/x86_64-linux-gnu/c++/4.9
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../include/c++/4.9/backward
-internal-isystem /usr/local/include -internal-isystem
/usr/local/clang-trunk/bin/../lib/clang/3.9.0/include -internal-externc-isystem
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -fdeprecated-macro
-fdebug-compilation-dir /data2 -ferror-limit 19 -fmessage-length 128
-fobjc-runtime=gcc -fcxx-exceptions -fexceptions -fdiagnostics-show-option
-fcolor-diagnostics -o small.o -x c++ small.cpp
1. small.cpp:11:3: current parser token 'return'
2. small.cpp:8:1: parsing function body 'main'
3. small.cpp:8:1: in compound statement ('{}')
clang-3.9: error: unable to execute command: Aborted (core dumped)
clang-3.9: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.9.0 (trunk 272993)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/bin
clang-3.9: note: diagnostic msg: PLEASE submit a bug report to
http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and
associated run script.
clang-3.9: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-3.9: note: diagnostic msg: /tmp/small-7e5974.cpp
clang-3.9: note: diagnostic msg: /tmp/small-7e5974.sh
clang-3.9: note: diagnostic msg:
********************
$
------------------------------
struct A { int i; };
struct B {};
struct C: A, B {};
int main ()
{
C c;
c.B::i = 0;
return 0;
}
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