[llvm-bugs] [Bug 44216] New: objc_direct attribute seems broken with invocations from Objective-C++ classes

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Dec 3 16:31:53 PST 2019


https://bugs.llvm.org/show_bug.cgi?id=44216

            Bug ID: 44216
           Summary: objc_direct attribute seems broken with invocations
                    from Objective-C++ classes
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: i at liuliu.me
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

I am experimenting with this attribute from commit:
https://github.com/llvm/llvm-project/commit/d4e1ba3fa9dfec2613bdcc7db0b58dea490c56b1

I am on trunk 705a6aef350246c790ff8e73864dd27a640c59c8

Adding direct in property attribute to ordinary objc class with callsites from
C++ side seems cause issues. Attached project exhibit this. Also attached crash
stacktraces and clang diagnostic package.

```
Process:               clang-10 [60115]
Path:                  /Users/USER/*/clang-10
Identifier:            clang-10
Version:               10.0.0 (10.0)
Code Type:             X86-64 (Native)
Parent Process:        clang-10 [60113]
Responsible:           clang-10 [60115]
User ID:               502

Date/Time:             2019-12-03 16:26:05.160 -0800
OS Version:            Mac OS X 10.14.6 (18G1012)
Report Version:        12
Bridge OS Version:     3.0 (14Y906)
Anonymous UUID:        C4F0532E-C439-4C6E-B87B-991B4A18BF64

Sleep/Wake UUID:       D3B480F3-43E7-4383-8517-C594956F4391

Time Awake Since Boot: 190000 seconds
Time Since Wake:       21000 seconds

System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_INVALID_ADDRESS at 0x0000000000000030
Exception Note:        EXC_CORPSE_NOTIFY

Termination Signal:    Segmentation fault: 11
Termination Reason:    Namespace SIGNAL, Code 0xb
Terminating Process:   exc handler [60115]

VM Regions Near 0x30:
--> 
    __TEXT                 000000010c38a000-0000000110e3a000 [ 74.7M] r-x/r-x
SM=COW  /Users/USER/*

Application Specific Information:
Stack dump:
0.      Program arguments:
/Users/liuliu/Snapchat/Dev/llvm-project/build/bin/clang-10 -cc1 -triple
x86_64-apple-ios10.0.0-simulator -Wdeprecated-objc-isa-usage
-Werror=deprecated-objc-isa-usage -Werror=implicit-function-declaration
-emit-obj -mrelax-all -disable-free -disable-llvm-verifier -discard-value-names
-main-file-name SCTestDocObjectsBuilders.mm -mrelocation-model pic -pic-level 2
-mthread-model posix -mframe-pointer=all -masm-verbose -munwind-tables
-target-sdk-version=13.2 -target-cpu core2 -dwarf-column-info
-debug-info-kind=standalone -dwarf-version=4 -debugger-tuning=lldb
-target-linker-version 520 -resource-dir
/Users/liuliu/Snapchat/Dev/llvm-project/build/lib/clang/10.0.0 -dependency-file
buck-out/gen/Apps/ClangBugReportDemo/ClangBugReportDemoBinary#compile-SCTestDocObjectsBuilders.mm.of70b8a92,iphonesimulator-x86_64/ClangBugReportDemo/SCTestDocObjectsBuilders.mm.o.dep
-MT
buck-out/gen/Apps/ClangBugReportDemo/ClangBugReportDemoBinary\#compile-SCTestDocObjectsBuilders.mm.of70b8a92,iphonesimulator-x86_64/ClangBugReportDemo/SCTestDocObjectsBuilders.mm.o
-sys-header-deps -isysroot
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk
-iquote /Users/liuliu/Snapchat/Dev/phantom -isysroot
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk
-iquote /Users/liuliu/Snapchat/Dev/phantom -I
buck-out/gen/Apps/ClangBugReportDemo/ClangBugReportDemoBinary#iphonesimulator-x86_64,private-headers.hmap
-I buck-out -D OBJC_OLD_DISPATCH_PROTOTYPES=0 -D DEBUG -D SHAKE_TO_REPORT -D
SHOTGUN_INTERNAL -D USE_HOCKEY -D SC_CREMA_SERVER_ENABLED -stdlib=libc++
-internal-isystem
/Users/liuliu/Snapchat/Dev/llvm-project/build/bin/../include/c++/v1
-internal-isystem
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/include/c++/v1
-internal-isystem
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/local/include
-internal-isystem
/Users/liuliu/Snapchat/Dev/llvm-project/build/lib/clang/10.0.0/include
-internal-externc-isystem
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/include
-O0 -Werror -Wno-nonportable-include-path -Wno-block-capture-autoreleasing
-Wno-unknown-warning-option -Wshorten-64-to-32 -Wall -Wextra
-Wno-delete-non-virtual-dtor -Wno-unknown-pragmas -Wno-char-subscripts
-Wno-missing-braces -Wno-reorder -Wno-overloaded-virtual
-Wno-unused-property-ivar -Wno-unused-local-typedef -Wno-ignored-qualifiers
-Wno-sign-compare -Wno-unused-parameter -Wno-missing-field-initializers
-Wno-nullability-completeness -std=c++1z -fdeprecated-macro
-fdebug-compilation-dir /Users/liuliu/Snapchat/Dev/phantom
-fdebug-prefix-map=/Applications/Xcode.app/Contents/Developer=APPLE_DEVELOPER_DIR
-fdebug-prefix-map=/Users/liuliu/Snapchat/Dev/phantom=.
-fdebug-prefix-map=/Users/liuliu/Snapchat/Dev/phantom=./////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-fdebug-prefix-map=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform=APPLE_PLATFORM_DIR
-fdebug-prefix-map=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk=APPLE_SDKROOT
-ferror-limit 19 -fmessage-length 0 -stack-protector 1 -fblocks
-fencode-extended-block-signature -fcoroutines-ts
-fregister-global-dtors-with-atexit -fgnuc-version=4.2.1 -fmodules
-fimplicit-module-maps
-fmodules-cache-path=/var/folders/mx/63c2qlgd7wdf1j22jkhb5lrw0000gp/C/org.llvm.clang.liuliu/ModuleCache
-fmodules-validate-system-headers -fobjc-runtime=ios-10.0.0 -fobjc-arc
-fobjc-arc-cxxlib=libc++ -fobjc-arc-exceptions -fobjc-exceptions
-fcxx-exceptions -fexceptions -fno-aligned-allocation -fmax-type-align=16
-fno-common -fdiagnostics-show-option -fcolor-diagnostics
-fdebug-compilation-dir
./////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-o
buck-out/gen/Apps/ClangBugReportDemo/ClangBugReportDemoBinary#compile-SCTestDocObjectsBuilders.mm.of70b8a92,iphonesimulator-x86_64/ClangBugReportDemo/SCTestDocObjectsBuilders.mm.o
-x objective-c++
Apps/ClangBugReportDemo/ClangBugReportDemo/SCTestDocObjectsBuilders.mm 
1.     
Apps/ClangBugReportDemo/ClangBugReportDemo/SCTestDocObjectsBuilders.mm:139:71:
current parser token ';'
2.     
Apps/ClangBugReportDemo/ClangBugReportDemo/SCTestDocObjectsBuilders.mm:136:26:
LLVM IR generation of declaration
'SCTestMainEntityBuilder::SCTestMainEntityBuilder'
3.     
Apps/ClangBugReportDemo/ClangBugReportDemo/SCTestDocObjectsBuilders.mm:136:26:
Generating code for declaration
'SCTestMainEntityBuilder::SCTestMainEntityBuilder'


Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   clang-10                            0x000000010e09eb18
clang::CodeGen::CodeGenTypes::arrangeObjCMethodDeclaration(clang::ObjCMethodDecl
const*) + 8
1   clang-10                            0x000000010e1b84b3 (anonymous
namespace)::CGObjCCommonMac::GenerateDirectMethod(clang::ObjCMethodDecl const*,
clang::ObjCContainerDecl const*) + 227
2   clang-10                            0x000000010e1b7928 (anonymous
namespace)::CGObjCCommonMac::EmitMessageSend(clang::CodeGen::CodeGenFunction&,
clang::CodeGen::ReturnValueSlot, clang::QualType, clang::Selector,
llvm::Value*, clang::QualType, bool, clang::CodeGen::CallArgList const&,
clang::ObjCMethodDecl const*, clang::ObjCInterfaceDecl const*, (anonymous
namespace)::ObjCCommonTypesHelper const&) + 984
3   clang-10                            0x000000010e1c083d (anonymous
namespace)::CGObjCNonFragileABIMac::GenerateMessageSend(clang::CodeGen::CodeGenFunction&,
clang::CodeGen::ReturnValueSlot, clang::QualType, clang::Selector,
llvm::Value*, clang::CodeGen::CallArgList const&, clang::ObjCInterfaceDecl
const*, clang::ObjCMethodDecl const*) + 237
4   clang-10                            0x000000010e174117
clang::CodeGen::CGObjCRuntime::GeneratePossiblySpecializedMessageSend(clang::CodeGen::CodeGenFunction&,
clang::CodeGen::ReturnValueSlot, clang::QualType, clang::Selector,
llvm::Value*, clang::CodeGen::CallArgList const&, clang::ObjCInterfaceDecl
const*, clang::ObjCMethodDecl const*, bool) + 87
5   clang-10                            0x000000010e175440
clang::CodeGen::CodeGenFunction::EmitObjCMessageExpr(clang::ObjCMessageExpr
const*, clang::CodeGen::ReturnValueSlot) + 3600
6   clang-10                            0x000000010e14b8b7
clang::StmtVisitorBase<std::__1::add_pointer, (anonymous
namespace)::ScalarExprEmitter, llvm::Value*>::Visit(clang::Stmt*) + 12391
7   clang-10                            0x000000010e1407fd
clang::CodeGen::CodeGenFunction::EmitScalarExpr(clang::Expr const*, bool) + 77
8   clang-10                            0x000000010e183b54 (anonymous
namespace)::ARCExprEmitter<(anonymous namespace)::ARCRetainExprEmitter,
llvm::PointerIntPair<llvm::Value*, 1u, bool,
llvm::PointerLikeTypeTraits<llvm::Value*>,
llvm::PointerIntPairInfo<llvm::Value*, 1u,
llvm::PointerLikeTypeTraits<llvm::Value*> > > >::visit(clang::Expr const*) +
1012
9   clang-10                            0x000000010e183f1f (anonymous
namespace)::ARCExprEmitter<(anonymous namespace)::ARCRetainExprEmitter,
llvm::PointerIntPair<llvm::Value*, 1u, bool,
llvm::PointerLikeTypeTraits<llvm::Value*>,
llvm::PointerIntPairInfo<llvm::Value*, 1u,
llvm::PointerLikeTypeTraits<llvm::Value*> > > >::visit(clang::Expr const*) +
1983
10  clang-10                            0x000000010e17f1e4
clang::CodeGen::CodeGenFunction::EmitARCRetainScalarExpr(clang::Expr const*) +
196
11  clang-10                            0x000000010e0e5e64
clang::CodeGen::CodeGenFunction::EmitScalarInit(clang::Expr const*,
clang::ValueDecl const*, clang::CodeGen::LValue, bool) + 596
12  clang-10                            0x000000010e0b560d
clang::CodeGen::CodeGenFunction::EmitInitializerForField(clang::FieldDecl*,
clang::CodeGen::LValue, clang::Expr*) + 429
13  clang-10                            0x000000010e0bea8d
EmitMemberInitializer(clang::CodeGen::CodeGenFunction&, clang::CXXRecordDecl
const*, clang::CXXCtorInitializer*, clang::CXXConstructorDecl const*,
clang::CodeGen::FunctionArgList&) + 813
14  clang-10                            0x000000010e0b6c4f
clang::CodeGen::CodeGenFunction::EmitCtorPrologue(clang::CXXConstructorDecl
const*, clang::CXXCtorType, clang::CodeGen::FunctionArgList&) + 2239
15  clang-10                            0x000000010e0b6098
clang::CodeGen::CodeGenFunction::EmitConstructorBody(clang::CodeGen::FunctionArgList&)
+ 472
16  clang-10                            0x000000010e285fa0
clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl,
llvm::Function*, clang::CodeGen::CGFunctionInfo const&) + 880
17  clang-10                            0x000000010e09ad25
clang::CodeGen::CodeGenModule::codegenCXXStructor(clang::GlobalDecl) + 213
18  clang-10                            0x000000010e305afd (anonymous
namespace)::ItaniumCXXABI::emitCXXStructor(clang::GlobalDecl) + 765
19  clang-10                            0x000000010e299a5b
clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl,
llvm::GlobalValue*) + 267
20  clang-10                            0x000000010e30124b (anonymous
namespace)::ItaniumCXXABI::EmitCXXConstructors(clang::CXXConstructorDecl
const*) + 43
21  clang-10                            0x000000010e320f2f (anonymous
namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) + 127
22  clang-10                            0x000000010e27d5d1
clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) + 177
23  clang-10                            0x000000010f207742
clang::ParseAST(clang::Sema&, bool, bool) + 514
24  clang-10                            0x000000010e5581ba
clang::FrontendAction::Execute() + 154
25  clang-10                            0x000000010e4ecddf
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 1519
26  clang-10                            0x000000010e5c6cfe
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 1726
27  clang-10                            0x000000010c3919fc
cc1_main(llvm::ArrayRef<char const*>, char const*, void*) + 2444
28  clang-10                            0x000000010c38f3ab main + 10747
29  libdyld.dylib                       0x00007fff65ba33d5 start + 1

Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x0000000000000000  rbx: 0x00007f8d75006ad8  rcx: 0x000000000000005d 
rdx: 0x0000000000000000
  rdi: 0x00007f8d75006ad8  rsi: 0x00007f8d751a2fb0  rbp: 0x00007ffee386bd60 
rsp: 0x00007ffee386bd60
   r8: 0x0000000000000000   r9: 0x0000000000000010  r10: 0x00007f8d75004a88 
r11: 0x00000000000000cb
  r12: 0x00007f8d75800a00  r13: 0x00007f8d751a2fb0  r14: 0x00007f8d75800a00 
r15: 0x00007f8d751a2fb0
  rip: 0x000000010e09eb18  rfl: 0x0000000000010206  cr2: 0x0000000000000030

Logical CPU:     6
Error Code:      0x00000004
Trap Number:     14


Binary Images:
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<D2D52E46-252B-325E-A15A-5AC5EC446935> /Users/USER/*/clang-10
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    0x7fff62b87000 -     0x7fff62b88ffb  libSystem.B.dylib (1252.250.1)
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    0x7fff62dcc000 -     0x7fff62e1fff7  libc++.1.dylib (400.9.4)
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<1987D1E1-DB11-3291-B12A-EBD55848E02D> /usr/lib/system/libcache.dylib
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    0x7fff65a36000 -     0x7fff65a3dff7  libcompiler_rt.dylib (63.4)
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    0x7fff65b53000 -     0x7fff65b8cff7  libdispatch.dylib (1008.270.1)
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    0x7fff65bd2000 -     0x7fff65bd3ff7  libremovefile.dylib (45.200.2)
<9FBEB2FF-EEBE-31BC-BCFC-C71F8D0E99B6> /usr/lib/system/libremovefile.dylib
    0x7fff65bd4000 -     0x7fff65bebff3  libsystem_asl.dylib (356.200.4)
<A62A7249-38B8-33FA-9875-F1852590796C> /usr/lib/system/libsystem_asl.dylib
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<A453E8EE-860D-3CED-B5DC-BE54E9DB4348> /usr/lib/system/libsystem_blocks.dylib
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    0x7fff65c75000 -     0x7fff65c78ffb  libsystem_configuration.dylib
(963.270.3) <2B4A836D-68A4-33E6-8D48-CD4486B03387>
/usr/lib/system/libsystem_configuration.dylib
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<719F75A4-74C5-3BA6-A09E-0C5A3E5889D7>
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<7DEE2300-6D8E-3C00-9C63-E3E80D56B0C4> /usr/lib/system/libxpc.dylib

External Modification Summary:
  Calls made by other processes targeting this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by all processes on this machine:
    task_for_pid: 26001413
    thread_create: 0
    thread_set_state: 498

VM Region Summary:
ReadOnly portion of Libraries: Total=323.3M resident=0K(0%)
swapped_out_or_unallocated=323.3M(100%)
Writable regions: Total=103.7M written=0K(0%) resident=0K(0%)
swapped_out=0K(0%) unallocated=103.7M(100%)

                                VIRTUAL   REGION 
REGION TYPE                        SIZE    COUNT (non-coalesced) 
===========                     =======  ======= 
Kernel Alloc Once                    8K        1 
MALLOC                            95.5M       20 
MALLOC guard page                   16K        4 
STACK GUARD                       56.0M        1 
Stack                             8192K        1 
__DATA                            10.3M       41 
__LINKEDIT                       236.7M        3 
__TEXT                            86.6M       41 
mapped file                       27.7M       17 
shared memory                        8K        2 
===========                     =======  ======= 
TOTAL                            520.7M      131 

```

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