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ahatanak opened this issue May 28, 2024 · 4 comments · Fixed by #93749
Closed

clang crashes with c++2b when variable is captured by a block nested inside a lambda #93625

ahatanak opened this issue May 28, 2024 · 4 comments · Fixed by #93749
Labels
c++26 clang:frontend Language frontend issues, e.g. anything involving "Sema" confirmed Verified by a second party crash-on-valid lambda C++11 lambda expressions

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@ahatanak
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ahatanak commented May 28, 2024 •
edited by shafik
Loading

$ cat test.cpp

struct S {
  constexpr ~S();
};

void func(S const &a) {
  [a](auto b) {
    ^{
      (void)a;
    };
  }(12);
}

$ clang++ -std=c++2b -fblocks -c -o /dev/null test.cpp

Assertion

clang++: /root/llvm-project/llvm/include/llvm/Support/Casting.h:109:
static bool llvm::isa_impl_cl<To, const From*>::doit(const From*) [with To = clang::Expr; From = clang::Stmt]:
Assertion `Val && "isa<> used on a null pointer"' failed.

Backtrace

PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.	Program arguments: /opt/compiler-explorer/clang-assertions-18.1.0/bin/clang++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -S --gcc-toolchain=/opt/compiler-explorer/gcc-13.2.0 -fcolor-diagnostics -fno-crash-diagnostics -fblocks -std=c++2b <source>
1.	<source>:10:7: current parser token ')'
2.	<source>:5:23: parsing function body 'func'
3.	<source>:5:23: in compound statement ('{}')
4.	<source>:6:3: instantiating function definition 'func(const S &)::(anonymous class)::operator()<int>'
 #0 0x00000000038d53d8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x38d53d8)
 #1 0x00000000038d30bc llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x38d30bc)
 #2 0x000000000381baa8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007cb4d3a42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007cb4d3a969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007cb4d3a42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007cb4d3a287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007cb4d3a2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007cb4d3a39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x00000000071d26aa clang::VarDecl::getInit() (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x71d26aa)
#10 0x00000000071e2813 clang::VarDecl::isUsableInConstantExpressions(clang::ASTContext const&) const (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x71e2813)
#11 0x000000000660582c clang::Sema::getNonOdrUseReasonInCurrentContext(clang::ValueDecl*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x660582c)
#12 0x0000000006686d11 clang::Sema::BuildDeclRefExpr(clang::ValueDecl*, clang::QualType, clang::ExprValueKind, clang::DeclarationNameInfo const&, clang::NestedNameSpecifierLoc, clang::NamedDecl*, clang::SourceLocation, clang::TemplateArgumentListInfo const*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6686d11)
#13 0x000000000668754c clang::Sema::BuildDeclRefExpr(clang::ValueDecl*, clang::QualType, clang::ExprValueKind, clang::DeclarationNameInfo const&, clang::CXXScopeSpec const*, clang::NamedDecl*, clang::SourceLocation, clang::TemplateArgumentListInfo const*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x668754c)
#14 0x000000000668c721 clang::Sema::BuildDeclarationNameExpr(clang::CXXScopeSpec const&, clang::DeclarationNameInfo const&, clang::NamedDecl*, clang::NamedDecl*, clang::TemplateArgumentListInfo const*, bool) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x668c721)
#15 0x00000000066b9c82 clang::Sema::ActOnBlockStmtExpr(clang::SourceLocation, clang::Stmt*, clang::Scope*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x66b9c82)
#16 0x0000000006c6641f clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformBlockExpr(clang::BlockExpr*) SemaTemplateInstantiate.cpp:0:0
#17 0x0000000006c29100 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#18 0x0000000006c5eedf clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformStmt(clang::Stmt*, clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::StmtDiscardKind) SemaTemplateInstantiate.cpp:0:0
#19 0x0000000006c5fac4 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformCompoundStmt(clang::CompoundStmt*, bool) SemaTemplateInstantiate.cpp:0:0
#20 0x0000000006c65f4a clang::Sema::SubstStmt(clang::Stmt*, clang::MultiLevelTemplateArgumentList const&) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6c65f4a)
#21 0x0000000006cb6486 clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation, clang::FunctionDecl*, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6cb6486)
#22 0x0000000006251ba1 clang::Sema::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6251ba1)
#23 0x0000000006b9ac42 clang::Sema::DeduceReturnType(clang::FunctionDecl*, clang::SourceLocation, bool) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6b9ac42)
#24 0x0000000006641d3a clang::Sema::DiagnoseUseOfDecl(clang::NamedDecl*, llvm::ArrayRef<clang::SourceLocation>, clang::ObjCInterfaceDecl const*, bool, bool, clang::ObjCInterfaceDecl*, bool) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6641d3a)
#25 0x00000000069e1a07 CreateFunctionRefExpr(clang::Sema&, clang::FunctionDecl*, clang::NamedDecl*, clang::Expr const*, bool, clang::SourceLocation, clang::DeclarationNameLoc const&) SemaOverload.cpp:0:0
#26 0x0000000006a1e696 clang::Sema::BuildCallToObjectOfClassType(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6a1e696)
#27 0x00000000066b515e clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, bool) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x66b515e)
#28 0x00000000066b6f3c clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x66b6f3c)
#29 0x000000000616d065 clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult<clang::Expr*, true>) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x616d065)
#30 0x0000000006164731 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6164731)
#31 0x000000000616795a clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x616795a)
#32 0x0000000006167af9 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6167af9)
#33 0x000000000616c619 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x616c619)
#34 0x00000000061e7e89 clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x61e7e89)
#35 0x00000000061de757 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x61de757)
#36 0x00000000061df5f7 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x61df5f7)
#37 0x00000000061e0519 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x61e0519)
#38 0x00000000061e1e3a clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x61e1e3a)
#39 0x0000000006100951 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6100951)
#40 0x0000000006135b11 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6135b11)
#41 0x00000000060f4adb clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x60f4adb)
#42 0x00000000060f5261 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x60f5261)
#43 0x00000000060fc516 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x60fc516)
#44 0x00000000060fd3bd clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x60fd3bd)
#45 0x00000000060f02ea clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x60f02ea)
#46 0x000000000415d928 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x415d928)
#47 0x00000000043cbfe9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x43cbfe9)
#48 0x000000000434ba9e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x434ba9e)
#49 0x00000000044ab01e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x44ab01e)
#50 0x0000000000c10cd6 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0xc10cd6)
#51 0x0000000000c084fa ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#52 0x000000000419ee49 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#53 0x000000000381bf54 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x381bf54)
#54 0x000000000419f43f clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0
#55 0x00000000041671c5 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x41671c5)
#56 0x0000000004167c2d clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x4167c2d)
#57 0x000000000416fb65 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x416fb65)
#58 0x0000000000c0e06c clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0xc0e06c)
#59 0x0000000000b05134 main (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0xb05134)
#60 0x00007cb4d3a29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#61 0x00007cb4d3a29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#62 0x0000000000c07fde _start (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0xc07fde)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
@github-actions github-actions bot added the clang Clang issues not falling into any other category label May 28, 2024
@EugeneZelenko EugeneZelenko added clang:frontend Language frontend issues, e.g. anything involving "Sema" c++26 and removed clang Clang issues not falling into any other category labels May 29, 2024
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llvmbot commented May 29, 2024

@llvm/issue-subscribers-clang-frontend

Author: Akira Hatanaka (ahatanak)

$ cat test.cpp ``` struct S { constexpr ~S(); };

void func(S const &a) {
[a](auto b) {
^{
(void)a;
};
}(12);
}


```console
$ clang++ -std=c++2b -fblocks -c -o /dev/null test.cpp

Assertion

clang++: /root/llvm-project/llvm/include/llvm/Support/Casting.h:109:
static bool llvm::isa_impl_cl&lt;To, const From*&gt;::doit(const From*) [with To = clang::Expr; From = clang::Stmt]:
Assertion `Val &amp;&amp; "isa&lt;&gt; used on a null pointer"' failed.

Backtrace

PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.	Program arguments: /opt/compiler-explorer/clang-assertions-18.1.0/bin/clang++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -S --gcc-toolchain=/opt/compiler-explorer/gcc-13.2.0 -fcolor-diagnostics -fno-crash-diagnostics -fblocks -std=c++2b &lt;source&gt;
1.	&lt;source&gt;:10:7: current parser token ')'
2.	&lt;source&gt;:5:23: parsing function body 'func'
3.	&lt;source&gt;:5:23: in compound statement ('{}')
4.	&lt;source&gt;:6:3: instantiating function definition 'func(const S &amp;)::(anonymous class)::operator()&lt;int&gt;'
 #<!-- -->0 0x00000000038d53d8 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x38d53d8)
 #<!-- -->1 0x00000000038d30bc llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x38d30bc)
 #<!-- -->2 0x000000000381baa8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #<!-- -->3 0x00007cb4d3a42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #<!-- -->4 0x00007cb4d3a969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #<!-- -->5 0x00007cb4d3a42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #<!-- -->6 0x00007cb4d3a287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #<!-- -->7 0x00007cb4d3a2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #<!-- -->8 0x00007cb4d3a39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #<!-- -->9 0x00000000071d26aa clang::VarDecl::getInit() (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x71d26aa)
#<!-- -->10 0x00000000071e2813 clang::VarDecl::isUsableInConstantExpressions(clang::ASTContext const&amp;) const (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x71e2813)
#<!-- -->11 0x000000000660582c clang::Sema::getNonOdrUseReasonInCurrentContext(clang::ValueDecl*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x660582c)
#<!-- -->12 0x0000000006686d11 clang::Sema::BuildDeclRefExpr(clang::ValueDecl*, clang::QualType, clang::ExprValueKind, clang::DeclarationNameInfo const&amp;, clang::NestedNameSpecifierLoc, clang::NamedDecl*, clang::SourceLocation, clang::TemplateArgumentListInfo const*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6686d11)
#<!-- -->13 0x000000000668754c clang::Sema::BuildDeclRefExpr(clang::ValueDecl*, clang::QualType, clang::ExprValueKind, clang::DeclarationNameInfo const&amp;, clang::CXXScopeSpec const*, clang::NamedDecl*, clang::SourceLocation, clang::TemplateArgumentListInfo const*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x668754c)
#<!-- -->14 0x000000000668c721 clang::Sema::BuildDeclarationNameExpr(clang::CXXScopeSpec const&amp;, clang::DeclarationNameInfo const&amp;, clang::NamedDecl*, clang::NamedDecl*, clang::TemplateArgumentListInfo const*, bool) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x668c721)
#<!-- -->15 0x00000000066b9c82 clang::Sema::ActOnBlockStmtExpr(clang::SourceLocation, clang::Stmt*, clang::Scope*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x66b9c82)
#<!-- -->16 0x0000000006c6641f clang::TreeTransform&lt;(anonymous namespace)::TemplateInstantiator&gt;::TransformBlockExpr(clang::BlockExpr*) SemaTemplateInstantiate.cpp:0:0
#<!-- -->17 0x0000000006c29100 clang::TreeTransform&lt;(anonymous namespace)::TemplateInstantiator&gt;::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#<!-- -->18 0x0000000006c5eedf clang::TreeTransform&lt;(anonymous namespace)::TemplateInstantiator&gt;::TransformStmt(clang::Stmt*, clang::TreeTransform&lt;(anonymous namespace)::TemplateInstantiator&gt;::StmtDiscardKind) SemaTemplateInstantiate.cpp:0:0
#<!-- -->19 0x0000000006c5fac4 clang::TreeTransform&lt;(anonymous namespace)::TemplateInstantiator&gt;::TransformCompoundStmt(clang::CompoundStmt*, bool) SemaTemplateInstantiate.cpp:0:0
#<!-- -->20 0x0000000006c65f4a clang::Sema::SubstStmt(clang::Stmt*, clang::MultiLevelTemplateArgumentList const&amp;) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6c65f4a)
#<!-- -->21 0x0000000006cb6486 clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation, clang::FunctionDecl*, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6cb6486)
#<!-- -->22 0x0000000006251ba1 clang::Sema::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref&lt;void ()&gt;) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6251ba1)
#<!-- -->23 0x0000000006b9ac42 clang::Sema::DeduceReturnType(clang::FunctionDecl*, clang::SourceLocation, bool) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6b9ac42)
#<!-- -->24 0x0000000006641d3a clang::Sema::DiagnoseUseOfDecl(clang::NamedDecl*, llvm::ArrayRef&lt;clang::SourceLocation&gt;, clang::ObjCInterfaceDecl const*, bool, bool, clang::ObjCInterfaceDecl*, bool) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6641d3a)
#<!-- -->25 0x00000000069e1a07 CreateFunctionRefExpr(clang::Sema&amp;, clang::FunctionDecl*, clang::NamedDecl*, clang::Expr const*, bool, clang::SourceLocation, clang::DeclarationNameLoc const&amp;) SemaOverload.cpp:0:0
#<!-- -->26 0x0000000006a1e696 clang::Sema::BuildCallToObjectOfClassType(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef&lt;clang::Expr*&gt;, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6a1e696)
#<!-- -->27 0x00000000066b515e clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef&lt;clang::Expr*&gt;, clang::SourceLocation, clang::Expr*, bool, bool) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x66b515e)
#<!-- -->28 0x00000000066b6f3c clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef&lt;clang::Expr*&gt;, clang::SourceLocation, clang::Expr*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x66b6f3c)
#<!-- -->29 0x000000000616d065 clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult&lt;clang::Expr*, true&gt;) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x616d065)
#<!-- -->30 0x0000000006164731 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&amp;, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6164731)
#<!-- -->31 0x000000000616795a clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x616795a)
#<!-- -->32 0x0000000006167af9 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6167af9)
#<!-- -->33 0x000000000616c619 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x616c619)
#<!-- -->34 0x00000000061e7e89 clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x61e7e89)
#<!-- -->35 0x00000000061de757 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector&lt;clang::Stmt*, 32u&gt;&amp;, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x61de757)
#<!-- -->36 0x00000000061df5f7 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector&lt;clang::Stmt*, 32u&gt;&amp;, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x61df5f7)
#<!-- -->37 0x00000000061e0519 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x61e0519)
#<!-- -->38 0x00000000061e1e3a clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&amp;) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x61e1e3a)
#<!-- -->39 0x0000000006100951 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&amp;, clang::Parser::ParsedTemplateInfo const&amp;, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6100951)
#<!-- -->40 0x0000000006135b11 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&amp;, clang::DeclaratorContext, clang::ParsedAttributes&amp;, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x6135b11)
#<!-- -->41 0x00000000060f4adb clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec&amp;, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x60f4adb)
#<!-- -->42 0x00000000060f5261 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x60f5261)
#<!-- -->43 0x00000000060fc516 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x60fc516)
#<!-- -->44 0x00000000060fd3bd clang::Parser::ParseTopLevelDecl(clang::OpaquePtr&lt;clang::DeclGroupRef&gt;&amp;, clang::Sema::ModuleImportState&amp;) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x60fd3bd)
#<!-- -->45 0x00000000060f02ea clang::ParseAST(clang::Sema&amp;, bool, bool) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x60f02ea)
#<!-- -->46 0x000000000415d928 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x415d928)
#<!-- -->47 0x00000000043cbfe9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x43cbfe9)
#<!-- -->48 0x000000000434ba9e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&amp;) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x434ba9e)
#<!-- -->49 0x00000000044ab01e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x44ab01e)
#<!-- -->50 0x0000000000c10cd6 cc1_main(llvm::ArrayRef&lt;char const*&gt;, char const*, void*) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0xc10cd6)
#<!-- -->51 0x0000000000c084fa ExecuteCC1Tool(llvm::SmallVectorImpl&lt;char const*&gt;&amp;, llvm::ToolContext const&amp;) driver.cpp:0:0
#<!-- -->52 0x000000000419ee49 void llvm::function_ref&lt;void ()&gt;::callback_fn&lt;clang::driver::CC1Command::Execute(llvm::ArrayRef&lt;std::optional&lt;llvm::StringRef&gt;&gt;, std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt;&gt;*, bool*) const::'lambda'()&gt;(long) Job.cpp:0:0
#<!-- -->53 0x000000000381bf54 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref&lt;void ()&gt;) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x381bf54)
#<!-- -->54 0x000000000419f43f clang::driver::CC1Command::Execute(llvm::ArrayRef&lt;std::optional&lt;llvm::StringRef&gt;&gt;, std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt;&gt;*, bool*) const (.part.0) Job.cpp:0:0
#<!-- -->55 0x00000000041671c5 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&amp;, clang::driver::Command const*&amp;, bool) const (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x41671c5)
#<!-- -->56 0x0000000004167c2d clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&amp;, llvm::SmallVectorImpl&lt;std::pair&lt;int, clang::driver::Command const*&gt;&gt;&amp;, bool) const (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x4167c2d)
#<!-- -->57 0x000000000416fb65 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&amp;, llvm::SmallVectorImpl&lt;std::pair&lt;int, clang::driver::Command const*&gt;&gt;&amp;) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0x416fb65)
#<!-- -->58 0x0000000000c0e06c clang_main(int, char**, llvm::ToolContext const&amp;) (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0xc0e06c)
#<!-- -->59 0x0000000000b05134 main (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0xb05134)
#<!-- -->60 0x00007cb4d3a29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#<!-- -->61 0x00007cb4d3a29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#<!-- -->62 0x0000000000c07fde _start (/opt/compiler-explorer/clang-assertions-18.1.0/bin/clang+++0xc07fde)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134

@zyn0217
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zyn0217 commented May 29, 2024

Crashed since 17 https://gcc.godbolt.org/z/1Tvcj953T

@zyn0217 zyn0217 added the confirmed Verified by a second party label May 29, 2024
@ahatanak
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I bisected the crash to bc73ef0.

@ahatanak ahatanak mentioned this issue May 29, 2024
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@shafik
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shafik commented May 30, 2024

CC @zygoloid

@EugeneZelenko EugeneZelenko added the lambda C++11 lambda expressions label May 30, 2024
ahatanak added a commit that referenced this issue May 30, 2024
@ahatanak
[clang] Fix a crash when a variable is captured by a block nested ins…
e1c3e16 
…ide a lambda (#93749)

`Eval->Value.get` returns a null pointer when the variable doesn't have
an initializer. Use `cast_if_present` instead of `cast`.

This fixes #93625.

rdar://128482541
ahatanaka pushed a commit to swiftlang/llvm-project that referenced this issue May 31, 2024
@ahatanak @ahatanaka
[clang] Fix a crash when a variable is captured by a block nested ins…
fa37db0 
…ide a lambda (llvm#93749)

`Eval->Value.get` returns a null pointer when the variable doesn't have
an initializer. Use `cast_if_present` instead of `cast`.

This fixes llvm#93625.

rdar://128482541
(cherry picked from commit e1c3e16)

Conflicts:
	clang/docs/ReleaseNotes.rst
@ahatanaka ahatanaka mentioned this issue May 31, 2024
Merged
ahatanaka pushed a commit to swiftlang/llvm-project that referenced this issue May 31, 2024
@ahatanak @ahatanaka
[clang] Fix a crash when a variable is captured by a block nested ins…
c0ae354 
…ide a lambda (llvm#93749)

`Eval->Value.get` returns a null pointer when the variable doesn't have
an initializer. Use `cast_if_present` instead of `cast`.

This fixes llvm#93625.

rdar://128482541
(cherry picked from commit e1c3e16)

Conflicts:
	clang/docs/ReleaseNotes.rst
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c++26 clang:frontend Language frontend issues, e.g. anything involving "Sema" confirmed Verified by a second party crash-on-valid lambda C++11 lambda expressions
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