https://llvm.org/bugs/show_bug.cgi?id=27797
Bug ID: 27797
Summary: Clang crashes on capturing this when template
instantiation creates nested lambdas
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: unassignedclangb...@nondot.org
Reporter: t...@fb.com
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
Classification: Unclassified
Compiler crashes with assertion failure in line 908 of lib/Sema/SemaExprCXX.cpp
(revision 269789). getCurLambda call in line 907 returns nullptr because
"CurLSI->Lambda->Encloses(CurContext)" returns false in line 1196 of
lib/Sema/Sema.cpp.
It seems that the fundamental problem is passing "S.getCurrentThisType()" to
"LSI->addThisCapture" in line 11112 of lib/Sema/SemaDecl.cpp. At this point,
what is needed is "this" type for nesting lambda. However, inside
Sema::getCurrentThisType function, what computed from line 876-881 of
Sema/SemaExprCXX.cpp is "this" type for nested lambda.
Below is the stack dump:
#0 0x00000000013a6205 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x13a6205)
#1 0x00000000013a4236 llvm::sys::RunSignalHandlers()
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x13a4236)
#2 0x00000000013a4435 SignalHandler(int)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x13a4435)
#3 0x00007f24efaff7e0 __restore_rt (/lib64/libpthread.so.0+0xf7e0)
#4 0x0000000002089741 clang::Sema::getCurrentThisType()
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x2089741)
#5 0x0000000001f797c2 clang::Sema::ActOnStartOfFunctionDef(clang::Scope*,
clang::Decl*, clang::Sema::SkipBodyInfo*)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x1f797c2)
#6 0x000000000228c597
clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation,
clang::FunctionDecl*, bool, bool, bool)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x228c597)
#7 0x000000000222486a clang::Sema::DeduceReturnType(clang::FunctionDecl*,
clang::SourceLocation, bool)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x222486a)
#8 0x0000000002051841 clang::Sema::DiagnoseUseOfDecl(clang::NamedDecl*,
clang::SourceLocation, clang::ObjCInterfaceDecl const*, bool)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x2051841)
#9 0x0000000002176e60 CreateFunctionRefExpr(clang::Sema&, clang::FunctionDecl*,
clang::NamedDecl*, bool, clang::SourceLocation, clang::DeclarationNameLoc
const&) (/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x2176e60)
#10 0x000000000219f648 clang::Sema::BuildCallToObjectOfClassType(clang::Scope*,
clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>,
clang::SourceLocation)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x219f648)
#11 0x0000000002067933 clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*,
clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>,
clang::SourceLocation, clang::Expr*, bool)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x2067933)
#12 0x000000000225ff54 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformCallExpr(clang::CallExpr*)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x225ff54)
#13 0x000000000225bf9a clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x225bf9a)
#14 0x000000000226c72c clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformIfStmt(clang::IfStmt*)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x226c72c)
#15 0x000000000226b095 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformStmt(clang::Stmt*)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x226b095)
#16 0x000000000226be83 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformCompoundStmt(clang::CompoundStmt*,
bool) (/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x226be83)
#17 0x000000000226bf9b clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformCompoundStmt(clang::CompoundStmt*)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x226bf9b)
#18 0x000000000226b125 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformStmt(clang::Stmt*)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x226b125)
#19 0x000000000225a897 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformLambdaExpr(clang::LambdaExpr*)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x225a897)
#20 0x000000000225b99c clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x225b99c)
#21 0x000000000225cdfa clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformInitializer(clang::Expr*, bool)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x225cdfa)
#22 0x000000000225c80f clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformExprs(clang::Expr* const*, unsigned
int, bool, llvm::SmallVectorImpl<clang::Expr*>&, bool*)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x225c80f)
#23 0x000000000225fefc clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformCallExpr(clang::CallExpr*)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x225fefc)
#24 0x000000000225bf9a clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x225bf9a)
#25 0x000000000226b0c5 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformStmt(clang::Stmt*)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x226b0c5)
#26 0x000000000226be83 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformCompoundStmt(clang::CompoundStmt*,
bool) (/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x226be83)
#27 0x000000000226bf9b clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformCompoundStmt(clang::CompoundStmt*)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x226bf9b)
#28 0x000000000226b125 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformStmt(clang::Stmt*)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x226b125)
#29 0x000000000226e8ef clang::Sema::SubstStmt(clang::Stmt*,
clang::MultiLevelTemplateArgumentList const&)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x226e8ef)
#30 0x000000000228c618
clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation,
clang::FunctionDecl*, bool, bool, bool)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x228c618)
#31 0x000000000228c8c9 clang::Sema::PerformPendingInstantiations(bool)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x228c8c9)
#32 0x000000000228bf07
clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation,
clang::FunctionDecl*, bool, bool, bool)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x228bf07)
#33 0x000000000228c8c9 clang::Sema::PerformPendingInstantiations(bool)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x228c8c9)
#34 0x000000000228bf07
clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation,
clang::FunctionDecl*, bool, bool, bool)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x228bf07)
#35 0x000000000228c8c9 clang::Sema::PerformPendingInstantiations(bool)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x228c8c9)
#36 0x000000000228bf07
clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation,
clang::FunctionDecl*, bool, bool, bool)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x228bf07)
#37 0x000000000228c8c9 clang::Sema::PerformPendingInstantiations(bool)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x228c8c9)
#38 0x0000000001ebbc9f clang::Sema::ActOnEndOfTranslationUnit()
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x1ebbc9f)
#39 0x0000000001d07d51
clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x1d07d51)
#40 0x0000000001d00b03 clang::ParseAST(clang::Sema&, bool, bool)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x1d00b03)
#41 0x000000000177bc8e clang::FrontendAction::Execute()
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x177bc8e)
#42 0x000000000175a495
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x175a495)
#43 0x00000000017f70dc
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x17f70dc)
#44 0x00000000008845d0 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x8845d0)
#45 0x0000000000846fb2 main
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x846fb2)
#46 0x00007f24eedc4d5d __libc_start_main (/lib64/libc.so.6+0x1ed5d)
#47 0x0000000000880c91 _start
(/data/users/twoh/llvms/latest/build-release/bin/clang-3.9+0x880c91)
Stack dump:
0. Program arguments:
/data/users/twoh/llvms/latest/build-release/bin/clang-3.9 -cc1 -triple
x86_64-unknown-linux-gnu -emit-llvm-bc -emit-llvm-uselists -disable-free
-disable-llvm-verifier -discard-value-names -main-file-name test.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
/home/twoh/local/clang_debug/admarket_t11200264/test.bc -resource-dir
/data/users/twoh/llvms/latest/build-release/bin/../lib/clang/3.9.0 -I
/home/twoh/fbsource/fbcode -I
/home/twoh/fbsource/fbcode/third-party-buck/build/boost/include -I
/home/twoh/fbsource/fbcode/third-party-buck/build/glog/include -I
/home/twoh/fbsource/fbcode/third-party-buck/build/gflags/include -I
/home/twoh/fbsource/fbcode/third-party-buck/build/double_conversion/include
-internal-isystem
/opt/rh/devtoolset-2/root/usr/lib/gcc/x86_64-redhat-linux/4.8.2/../../../../include/c++/4.8.2
-internal-isystem
/opt/rh/devtoolset-2/root/usr/lib/gcc/x86_64-redhat-linux/4.8.2/../../../../include/c++/4.8.2/x86_64-redhat-linux
-internal-isystem
/opt/rh/devtoolset-2/root/usr/lib/gcc/x86_64-redhat-linux/4.8.2/../../../../include/c++/4.8.2/backward
-internal-isystem /usr/local/include -internal-isystem
/data/users/twoh/llvms/latest/build-release/bin/../lib/clang/3.9.0/include
-internal-externc-isystem /include -internal-externc-isystem /usr/include
-std=c++1y -fdeprecated-macro -fdebug-compilation-dir
/home/twoh/local/clang_debug/admarket_t11200264 -ferror-limit 19
-fmessage-length 362 -fobjc-runtime=gcc -fcxx-exceptions -fexceptions
-fdiagnostics-show-option -fcolor-diagnostics -o test.bc -x c++ test.cpp
1. <eof> parser at end of file
2. /home/twoh/fbsource/fbcode/folly/gen/Core-inl.h:290:6: instantiating
function definition 'operator|'
3. /home/twoh/fbsource/fbcode/folly/gen/Base-inl.h:2078:14: instantiating
function definition 'compose'
4. /home/twoh/fbsource/fbcode/folly/gen/Core-inl.h:255:1: instantiating
function definition 'operator|'
5. /home/twoh/fbsource/fbcode/folly/gen/Base-inl.h:560:10: instantiating
function definition 'foreach'
clang-3.9: error: unable to execute command: Segmentation fault
clang-3.9: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.9.0 (trunk 269789) (llvm/trunk 269788)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/twoh/local/llvms/latest/build-release/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:
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