[llvm-bugs] [Bug 41957] New: clang crash while parsing a struct in C

via llvm-bugs llvm-bugs at lists.llvm.org
Tue May 21 05:12:20 PDT 2019 

https://bugs.llvm.org/show_bug.cgi?id=41957

            Bug ID: 41957
           Summary: clang crash while parsing a struct in C
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C
          Assignee: unassignedclangbugs at nondot.org
          Reporter: llvm at zaghen.it
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

Created attachment 21979
  --> https://bugs.llvm.org/attachment.cgi?id=21979&action=edit
Reduced testcase for the crash

The expected result would be clang complaining about "__packed" (which would
lead to a missing include). This issue was introduced after LLVM 3.7 and is
still present in latest clang trunk.

I attached a manually reduced testcase.
https://godbolt.org/z/jdmr5k

Stack dump:

0.      Program arguments:
/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9 -cc1 -triple
x86_64-unknown-linux-gnu -S -disable-free -disable-llvm-verifier
-discard-value-names -main-file-name example.c -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 -debug-info-kind=limited -dwarf-version=4
-debugger-tuning=gdb -coverage-notes-file /home/ubuntu/./output.gcno
-resource-dir /opt/compiler-explorer/clang-trunk-20190521/lib/clang/9.0.0
-internal-isystem /usr/local/include -internal-isystem
/opt/compiler-explorer/clang-trunk-20190521/lib/clang/9.0.0/include
-internal-externc-isystem /usr/include/x86_64-linux-gnu
-internal-externc-isystem /include -internal-externc-isystem /usr/include
-fdebug-compilation-dir /home/ubuntu -ferror-limit 19 -fmessage-length 0
-fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics -mllvm
--x86-asm-syntax=intel -o ./output.s -x c <source> -faddrsig 

1.      <source>:14:8: current parser token ';'

2.      <source>:2:1: parsing function body 'test'

3.      <source>:2:1: in compound statement ('{}')

4.      <source>:12:2: parsing struct/union body

 #0 0x00005616d7606cba llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x269bcba)

 #1 0x00005616d7604a84 llvm::sys::RunSignalHandlers()
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x2699a84)

 #2 0x00005616d7604bc2 SignalHandler(int)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x2699bc2)

 #3 0x00007f146901f890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)

 #4 0x00005616d9398be1 clang::DeclContext::addHiddenDecl(clang::Decl*)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x442dbe1)

 #5 0x00005616d939ce79 clang::DeclContext::addDecl(clang::Decl*)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x4431e79)

 #6 0x00005616d8c9e06c clang::Sema::PushOnScopeChains(clang::NamedDecl*,
clang::Scope*, bool)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3d3306c)

 #7 0x00005616d8cb3cb0 clang::Sema::HandleField(clang::Scope*,
clang::RecordDecl*, clang::SourceLocation, clang::Declarator&, clang::Expr*,
clang::InClassInitStyle, clang::AccessSpecifier)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3d48cb0)

 #8 0x00005616d8cb3fdd clang::Sema::ActOnField(clang::Scope*, clang::Decl*,
clang::SourceLocation, clang::Declarator&, clang::Expr*)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3d48fdd)

 #9 0x00005616d8aed736 void llvm::function_ref<void
(clang::ParsingFieldDeclarator&)>::callback_fn<clang::Parser::ParseStructUnionBody(clang::SourceLocation,
unsigned int, clang::Decl*)::'lambda'(clang::ParsingFieldDeclarator&)>(long,
clang::ParsingFieldDeclarator&)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3b82736)

#10 0x00005616d8b05b65
clang::Parser::ParseStructDeclaration(clang::ParsingDeclSpec&,
llvm::function_ref<void (clang::ParsingFieldDeclarator&)>)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3b9ab65)

#11 0x00005616d8b09c15
clang::Parser::ParseStructUnionBody(clang::SourceLocation, unsigned int,
clang::Decl*)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3b9ec15)

#12 0x00005616d8b1c32c
clang::Parser::ParseClassSpecifier(clang::tok::TokenKind,
clang::SourceLocation, clang::DeclSpec&, clang::Parser::ParsedTemplateInfo
const&, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext,
clang::Parser::ParsedAttributesWithRange&)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3bb132c)

#13 0x00005616d8afe18e
clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&,
clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier,
clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3b9318e)

#14 0x00005616d8b06494
clang::Parser::ParseSimpleDeclaration(clang::DeclaratorContext,
clang::SourceLocation&, clang::Parser::ParsedAttributesWithRange&, bool,
clang::Parser::ForRangeInit*)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3b9b494)

#15 0x00005616d8b067fa
clang::Parser::ParseDeclaration(clang::DeclaratorContext,
clang::SourceLocation&, clang::Parser::ParsedAttributesWithRange&)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3b9b7fa)

#16 0x00005616d8b6c4c2
clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*,
clang::Parser::ParsedAttributesWithRange&)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3c014c2)

#17 0x00005616d8b6daf9
clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3c02af9)

#18 0x00005616d8b71121 clang::Parser::ParseCompoundStatementBody(bool)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3c06121)

#19 0x00005616d8b741e3 clang::Parser::ParseFunctionStatementBody(clang::Decl*,
clang::Parser::ParseScope&)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3c091e3)

#20 0x00005616d8ae1b68
clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&,
clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3b76b68)

#21 0x00005616d8b02381 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&,
clang::DeclaratorContext, clang::SourceLocation*, clang::Parser::ForRangeInit*)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3b97381)

#22 0x00005616d8adcad9
clang::Parser::ParseDeclOrFunctionDefInternal(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec&, clang::AccessSpecifier)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3b71ad9)

#23 0x00005616d8add7b1
clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*, clang::AccessSpecifier) (.part.207)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3b727b1)

#24 0x00005616d8ae4a06
clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3b79a06)

#25 0x00005616d8ae5469
clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, bool)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3b7a469)

#26 0x00005616d8ae5995
clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3b7a995)

#27 0x00005616d8ad9246 clang::ParseAST(clang::Sema&, bool, bool)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x3b6e246)

#28 0x00005616d832c017 clang::CodeGenAction::ExecuteAction()
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x33c1017)

#29 0x00005616d7cc8826 clang::FrontendAction::Execute()
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x2d5d826)

#30 0x00005616d7c8b41c
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x2d2041c)

#31 0x00005616d7d86eb3
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0x2e1beb3)

#32 0x00005616d5bf9d90 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0xc8ed90)

#33 0x00005616d5b5c3b2 main
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0xbf13b2)

#34 0x00007f1467eddb97 __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x21b97)

#35 0x00005616d5bf738a _start
(/opt/compiler-explorer/clang-trunk-20190521/bin/clang-9+0xc8c38a)

clang-9: error: unable to execute command: Segmentation fault (core dumped)

clang-9: error: clang frontend command failed due to signal (use -v to see
invocation)

Compiler returned: 254

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