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<head>
<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - no_unique_address makes clang::ASTContext::getObjCEncodingForStructureImpl fail with Assertion `CurOffs <= CurLayObj->first' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=48048">48048</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>no_unique_address makes clang::ASTContext::getObjCEncodingForStructureImpl fail with Assertion `CurOffs <= CurLayObj->first' failed.
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nicolasweber@gmx.de
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>thakis@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@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>
<span class="quote">>&, clang::FieldDecl const*, bool, clang::QualType*) const</span >
(out/gn/bin/clang+0x3638d9d)
#10 0x00000000036369ac
clang::ASTContext::getObjCEncodingForTypeImpl(clang::QualType,
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>
<span class="quote">>&, clang::ASTContext::ObjCEncOptions, clang::FieldDecl const*,</span >
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 <a href="https://crbug.com/1144431">https://crbug.com/1144431</a>)</pre>
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