[llvm-bugs] [Bug 48048] New: no_unique_address makes clang::ASTContext::getObjCEncodingForStructureImpl fail with Assertion `CurOffs <= CurLayObj->first' failed.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48048

            Bug ID: 48048
           Summary: no_unique_address makes
                    clang::ASTContext::getObjCEncodingForStructureImpl
                    fail with Assertion `CurOffs <= CurLayObj->first'
                    failed.
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nicolasweber at gmx.de
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

thakis at thakis:~/src/llvm-project$ cat
crw_js_navigation_handler-66a6fd-ae8518.reduced.mm
struct f {};
class i {
  int m;
  [[no_unique_address]] f n;
};
@interface v @end
@implementation v
- (i)message {
  return i();
}
@end
thakis at thakis:~/src/llvm-project$ out/gn/bin/clang -cc1 -emit-llvm
crw_js_navigation_handler-66a6fd-ae8518.reduced.mm
crw_js_navigation_handler-66a6fd-ae8518.reduced.mm:6:12: warning: class 'v'
defined without specifying a base class [-Wobjc-root-class]
@interface v @end
           ^
crw_js_navigation_handler-66a6fd-ae8518.reduced.mm:6:13: note: add a super
class to fix this problem
@interface v @end
            ^
clang: ../../clang/lib/AST/ASTContext.cpp:7718: void
clang::ASTContext::getObjCEncodingForStructureImpl(clang::RecordDecl *,
std::string &, const clang::FieldDecl *, bool, clang::QualType *) const:
Assertion `CurOffs <= CurLayObj->first' failed.
Stack dump:
0.      Program arguments: out/gn/bin/clang -cc1 -emit-llvm
crw_js_navigation_handler-66a6fd-ae8518.reduced.mm 
1.      <eof> parser at end of file
2.      crw_js_navigation_handler-66a6fd-ae8518.reduced.mm:8:1: LLVM IR
generation of declaration 'v::message'
 #0 0x0000000002e6260c llvm::sys::PrintStackTrace(llvm::raw_ostream&, int)
(out/gn/bin/clang+0x2e6260c)
 #1 0x0000000002e6036e llvm::sys::RunSignalHandlers()
(out/gn/bin/clang+0x2e6036e)
 #2 0x0000000002e62955 SignalHandler(int) (out/gn/bin/clang+0x2e62955)
 #3 0x00007f2baf4e0140 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x14140)
 #4 0x00007f2baeff8db1 raise ./signal/../sysdeps/unix/sysv/linux/raise.c:51:1
 #5 0x00007f2baefe2537 abort ./stdlib/abort.c:81:7
 #6 0x00007f2baefe240f get_sysdep_segment_value ./intl/loadmsgcat.c:509:8
 #7 0x00007f2baefe240f _nl_load_domain ./intl/loadmsgcat.c:970:34
 #8 0x00007f2baeff15b2 (/lib/x86_64-linux-gnu/libc.so.6+0x345b2)
 #9 0x0000000003638d9d
clang::ASTContext::getObjCEncodingForStructureImpl(clang::RecordDecl*,
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>
>&, clang::FieldDecl const*, bool, clang::QualType*) const
(out/gn/bin/clang+0x3638d9d)
#10 0x00000000036369ac
clang::ASTContext::getObjCEncodingForTypeImpl(clang::QualType,
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>
>&, clang::ASTContext::ObjCEncOptions, clang::FieldDecl const*,
clang::QualType*) const (out/gn/bin/clang+0x36369ac)
#11 0x000000000363710f
clang::ASTContext::getObjCEncodingForMethodDecl[abi:cxx11](clang::ObjCMethodDecl
const*, bool) const (out/gn/bin/clang+0x363710f)
#12 0x000000000218df26 (anonymous
namespace)::CGObjCCommonMac::GetMethodVarType(clang::ObjCMethodDecl const*,
bool) (out/gn/bin/clang+0x218df26)
#13 0x000000000219df85 (anonymous
namespace)::CGObjCNonFragileABIMac::emitMethodList(llvm::Twine, (anonymous
namespace)::(anonymous namespace)::MethodListType,
llvm::ArrayRef<clang::ObjCMethodDecl const*>) (out/gn/bin/clang+0x219df85)
#14 0x000000000219f16e (anonymous
namespace)::CGObjCNonFragileABIMac::BuildClassRoTInitializer(unsigned int,
unsigned int, unsigned int, clang::ObjCImplementationDecl const*)
(out/gn/bin/clang+0x219f16e)
#15 0x000000000219844c (anonymous
namespace)::CGObjCNonFragileABIMac::GenerateClass(clang::ObjCImplementationDecl
const*) (out/gn/bin/clang+0x219844c)
#16 0x0000000001e8e5f2
clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*)
(out/gn/bin/clang+0x1e8e5f2)
#17 0x00000000024d925f (anonymous
namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef)
(out/gn/bin/clang+0x24d925f)
#18 0x00000000024d76fd
clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef)
(out/gn/bin/clang+0x24d76fd)
#19 0x0000000003b487f8 clang::ParseAST(clang::Sema&, bool, bool)
(out/gn/bin/clang+0x3b487f8)
#20 0x0000000002424db3 clang::FrontendAction::Execute()
(out/gn/bin/clang+0x2424db3)
#21 0x000000000238004a
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(out/gn/bin/clang+0x238004a)
#22 0x00000000024d1022
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(out/gn/bin/clang+0x24d1022)
#23 0x0000000001d8c530 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (out/gn/bin/clang+0x1d8c530)
#24 0x0000000001d9ab78 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&)
(out/gn/bin/clang+0x1d9ab78)



getObjCEncodingForStructureImpl presumably handles the empty base class
optimization somehow, so we need to do something similar for no_unique_address



(reduced from https://crbug.com/1144431)

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20201102/bffb8306/attachment.html>