https://llvm.org/bugs/show_bug.cgi?id=28182
Bug ID: 28182
Summary: clang crashes on C++ code with ambiguous reference:
Assertion `!Found.isAmbiguous() && "Cannot handle
ambiguities here yet"' 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.
This is a regression from 3.8.x.
$ 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/SemaCXXScopeSpec.cpp:371:
clang::NamedDecl* clang::Sema::FindFirstQualifierInScope(clang::Scope*,
clang::NestedNameSpecifier*): Assertion `!Found.isAmbiguous() && "Cannot handle
ambiguities here yet"' 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 0x00007f0b62465340 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#4 0x00007f0b61683cc9 gsignal
/build/eglibc-3GlaMS/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x00007f0b616870d8 abort
/build/eglibc-3GlaMS/eglibc-2.19/stdlib/abort.c:91:0
#6 0x00007f0b6167cb86 __assert_fail_base
/build/eglibc-3GlaMS/eglibc-2.19/assert/assert.c:92:0
#7 0x00007f0b6167cc32 (/lib/x86_64-linux-gnu/libc.so.6+0x2fc32)
#8 0x0000000002a193cf clang::Sema::FindFirstQualifierInScope(clang::Scope*,
clang::NestedNameSpecifier*) (/usr/local/clang-trunk/bin/clang-3.9+0x2a193cf)
#9 0x0000000002c43694 clang::Sema::ActOnMemberAccessExpr(clang::Scope*,
clang::Expr*, clang::SourceLocation, clang::tok::TokenKind,
clang::CXXScopeSpec&, clang::SourceLocation, clang::UnqualifiedId&,
clang::Decl*) (/usr/local/clang-trunk/bin/clang-3.9+0x2c43694)
#10 0x0000000002835ffe
clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult<clang::Expr*,
true>) (/usr/local/clang-trunk/bin/clang-3.9+0x2835ffe)
#11 0x0000000002830b18 clang::Parser::ParseCastExpression(bool, bool, bool&,
clang::Parser::TypeCastState) (/usr/local/clang-trunk/bin/clang-3.9+0x2830b18)
#12 0x000000000283367d clang::Parser::ParseCastExpression(bool, bool,
clang::Parser::TypeCastState) (/usr/local/clang-trunk/bin/clang-3.9+0x283367d)
#13 0x0000000002833709
clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState)
(/usr/local/clang-trunk/bin/clang-3.9+0x2833709)
#14 0x0000000002833789
clang::Parser::ParseExpression(clang::Parser::TypeCastState)
(/usr/local/clang-trunk/bin/clang-3.9+0x2833789)
#15 0x0000000002874b96 clang::Parser::ParseExprStatement()
(/usr/local/clang-trunk/bin/clang-3.9+0x2874b96)
#16 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)
#17 0x00000000028721ce
clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::AllowedContsructsKind, clang::SourceLocation*)
(/usr/local/clang-trunk/bin/clang-3.9+0x28721ce)
#18 0x00000000028767b9 clang::Parser::ParseCompoundStatementBody(bool)
(/usr/local/clang-trunk/bin/clang-3.9+0x28767b9)
#19 0x0000000002879009 clang::Parser::ParseFunctionStatementBody(clang::Decl*,
clang::Parser::ParseScope&) (/usr/local/clang-trunk/bin/clang-3.9+0x2879009)
#20 0x00000000027fb191
clang::Parser::ParseLexedMethodDef(clang::Parser::LexedMethod&)
(/usr/local/clang-trunk/bin/clang-3.9+0x27fb191)
#21 0x00000000027faf0e
clang::Parser::ParseLexedMethodDefs(clang::Parser::ParsingClass&)
(/usr/local/clang-trunk/bin/clang-3.9+0x27faf0e)
#22 0x000000000282bdf9
clang::Parser::ParseCXXMemberSpecification(clang::SourceLocation,
clang::SourceLocation, clang::Parser::ParsedAttributesWithRange&, unsigned int,
clang::Decl*) (/usr/local/clang-trunk/bin/clang-3.9+0x282bdf9)
#23 0x000000000282cb1f
clang::Parser::ParseClassSpecifier(clang::tok::TokenKind,
clang::SourceLocation, clang::DeclSpec&, clang::Parser::ParsedTemplateInfo
const&, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext,
clang::Parser::ParsedAttributesWithRange&)
(/usr/local/clang-trunk/bin/clang-3.9+0x282cb1f)
#24 0x000000000280e830
clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&,
clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier,
clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*)
(/usr/local/clang-trunk/bin/clang-3.9+0x280e830)
#25 0x0000000002885e3e
clang::Parser::ParseSingleDeclarationAfterTemplate(unsigned int,
clang::Parser::ParsedTemplateInfo const&, clang::ParsingDeclRAIIObject&,
clang::SourceLocation&, clang::AccessSpecifier, clang::AttributeList*)
(/usr/local/clang-trunk/bin/clang-3.9+0x2885e3e)
#26 0x0000000002887827
clang::Parser::ParseTemplateDeclarationOrSpecialization(unsigned int,
clang::SourceLocation&, clang::AccessSpecifier, clang::AttributeList*)
(/usr/local/clang-trunk/bin/clang-3.9+0x2887827)
#27 0x0000000002887b9a
clang::Parser::ParseDeclarationStartingWithTemplate(unsigned int,
clang::SourceLocation&, clang::AccessSpecifier, clang::AttributeList*)
(/usr/local/clang-trunk/bin/clang-3.9+0x2887b9a)
#28 0x0000000002819f14 clang::Parser::ParseDeclaration(unsigned int,
clang::SourceLocation&, clang::Parser::ParsedAttributesWithRange&)
(/usr/local/clang-trunk/bin/clang-3.9+0x2819f14)
#29 0x00000000027f8882
clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*) (/usr/local/clang-trunk/bin/clang-3.9+0x27f8882)
#30 0x00000000027f9030
clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&)
(/usr/local/clang-trunk/bin/clang-3.9+0x27f9030)
#31 0x00000000027f065b clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang-3.9+0x27f065b)
#32 0x0000000002486d3e clang::CodeGenAction::ExecuteAction()
(/usr/local/clang-trunk/bin/clang-3.9+0x2486d3e)
#33 0x00000000021977fe clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang-3.9+0x21977fe)
#34 0x000000000216d266
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang-3.9+0x216d266)
#35 0x00000000022245c2
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang-3.9+0x22245c2)
#36 0x0000000000af0548 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/usr/local/clang-trunk/bin/clang-3.9+0xaf0548)
#37 0x0000000000aa46dc main (/usr/local/clang-trunk/bin/clang-3.9+0xaa46dc)
#38 0x00007f0b6166eec5 __libc_start_main
/build/eglibc-3GlaMS/eglibc-2.19/csu/libc-start.c:321:0
#39 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 278
-fobjc-runtime=gcc -fcxx-exceptions -fexceptions -fdiagnostics-show-option
-fcolor-diagnostics -o small.o -x c++ small.cpp
1. small.cpp:10:13: current parser token '('
2. small.cpp:6:22: parsing struct/union/class body 'B'
3. small.cpp:9:3: parsing function body 'B::foo'
4. small.cpp:9:3: 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-fa9a75.cpp
clang-3.9: note: diagnostic msg: /tmp/small-fa9a75.sh
clang-3.9: note: diagnostic msg:
********************
$
--------------------------------------------------------
template < class T > struct A
{
void f () {}
};
template < class T > struct B : A < int >, A < char >
{
void foo (T *t)
{
t->A::f (); // should be: A < int >::f ();
}
};
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