| Issue |
131322
|
| Summary |
[clang] Crash caused by placement new in constexpr function
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
0cch
|
The following code snippet causes a crash when compiled. The issue arises from the use of placement new within a constexpr function (c++26 p2747r2). This behavior can be observed in the compiler explorer link provided below.
```c++
#include <new>
constexpr int initialize_value() {
int buffer[2] {};
new (&buffer) int{11}; // Placement new used here, int[] {11} will be ok
return buffer[0];
}
int main() {
constexpr int value = initialize_value();
}
```
Compiler Explorer Link:
[https://godbolt.org/z/eq6dzsojT](https://godbolt.org/z/eq6dzsojT)
stack dump:
```
Stack dump:
0. Program arguments: /opt/compiler-explorer/clang-20.1.0/bin/clang++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-14.2.0 -fcolor-diagnostics -fno-crash-diagnostics -std=c++26 <source>
1. <source>:10:45: current parser token ';'
2. <source>:9:12: parsing function body 'main'
3. <source>:9:12: in compound statement ('{}')
#0 0x0000000003a59568 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x3a59568)
#1 0x0000000003a576ac llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x3a576ac)
#2 0x00000000039a69e8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x00007e0223842520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x00000000074758ec (anonymous namespace)::ExtractSubobjectHandler::result_type findSubobject<(anonymous namespace)::ExtractSubobjectHandler>((anonymous namespace)::EvalInfo&, clang::Expr const*, (anonymous namespace)::CompleteObject const&, (anonymous namespace)::SubobjectDesignator const&, (anonymous namespace)::ExtractSubobjectHandler&) ExprConstant.cpp:0:0
#5 0x0000000007482553 handleLValueToRValueConversion((anonymous namespace)::EvalInfo&, clang::Expr const*, clang::QualType, (anonymous namespace)::LValue const&, clang::APValue&, bool) ExprConstant.cpp:0:0
#6 0x00000000074e2184 (anonymous namespace)::IntExprEvaluator::VisitCastExpr(clang::CastExpr const*) ExprConstant.cpp:0:0
#7 0x00000000074aaa2a clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::IntExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#8 0x000000000747a3ce Evaluate(clang::APValue&, (anonymous namespace)::EvalInfo&, clang::Expr const*) ExprConstant.cpp:0:0
#9 0x00000000074b0e44 EvaluateStmt((anonymous namespace)::StmtResult&, (anonymous namespace)::EvalInfo&, clang::Stmt const*, clang::SwitchCase const*) (.part.0) ExprConstant.cpp:0:0
#10 0x00000000074afff8 EvaluateStmt((anonymous namespace)::StmtResult&, (anonymous namespace)::EvalInfo&, clang::Stmt const*, clang::SwitchCase const*) (.part.0) ExprConstant.cpp:0:0
#11 0x00000000074b71fe HandleFunctionCall(clang::SourceLocation, clang::FunctionDecl const*, (anonymous namespace)::LValue const*, clang::Expr const*, llvm::ArrayRef<clang::Expr const*>, (anonymous namespace)::CallRef, clang::Stmt const*, (anonymous namespace)::EvalInfo&, clang::APValue&, (anonymous namespace)::LValue const*) (.isra.0) ExprConstant.cpp:0:0
#12 0x00000000074a9b4b (anonymous namespace)::IntExprEvaluator::VisitCallExpr(clang::CallExpr const*) ExprConstant.cpp:0:0
#13 0x00000000074aab75 clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::IntExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#14 0x000000000747a3ce Evaluate(clang::APValue&, (anonymous namespace)::EvalInfo&, clang::Expr const*) ExprConstant.cpp:0:0
#15 0x000000000748e39a EvaluateInPlace(clang::APValue&, (anonymous namespace)::EvalInfo&, (anonymous namespace)::LValue const&, clang::Expr const*, bool) ExprConstant.cpp:0:0
#16 0x00000000074b4e64 clang::Expr::EvaluateAsInitializer(clang::APValue&, clang::ASTContext const&, clang::VarDecl const*, llvm::SmallVectorImpl<std::pair<clang::SourceLocation, clang::PartialDiagnostic>>&, bool) const (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x74b4e64)
#17 0x0000000007357916 clang::VarDecl::evaluateValueImpl(llvm::SmallVectorImpl<std::pair<clang::SourceLocation, clang::PartialDiagnostic>>&, bool) const (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x7357916)
#18 0x0000000007357c5e clang::VarDecl::checkForConstantInitialization(llvm::SmallVectorImpl<std::pair<clang::SourceLocation, clang::PartialDiagnostic>>&) const (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x7357c5e)
#19 0x000000000667fddb clang::Sema::CheckCompleteVariableDeclaration(clang::VarDecl*) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x667fddb)
#20 0x0000000006684ebc clang::Sema::AddInitializerToDecl(clang::Decl*, clang::Expr*, bool) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x6684ebc)
#21 0x0000000006304c2a clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x6304c2a)
#22 0x000000000631ab5c clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x631ab5c)
#23 0x000000000631d67a clang::Parser::ParseSimpleDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, bool, clang::Parser::ForRangeInit*, clang::SourceLocation*) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x631d67a)
#24 0x000000000631db7f clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x631db7f)
#25 0x00000000063d2994 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x63d2994)
#26 0x00000000063d32ed clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x63d32ed)
#27 0x00000000063d4604 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x63d4604)
#28 0x00000000063d57ba clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x63d57ba)
#29 0x00000000062d0cf6 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x62d0cf6)
#30 0x000000000631afbf clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x631afbf)
#31 0x00000000062c92c7 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x62c92c7)
#32 0x00000000062ca0de clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x62ca0de)
#33 0x00000000062d39d2 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x62d39d2)
#34 0x00000000062d5268 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x62d5268)
#35 0x00000000062c38ca clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x62c38ca)
#36 0x00000000043aa295 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x43aa295)
#37 0x0000000004682ca1 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x4682ca1)
#38 0x000000000460260b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x460260b)
#39 0x000000000476e173 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x476e173)
#40 0x0000000000d116c1 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0xd116c1)
#41 0x0000000000d09eed ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#42 0x00000000043f5b49 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
#43 0x00000000039a6e13 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x39a6e13)
#44 0x00000000043f5d69 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
#45 0x00000000043b9ebd clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x43b9ebd)
#46 0x00000000043bae51 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x43bae51)
#47 0x00000000043c51ec clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x43c51ec)
#48 0x0000000000d0e391 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0xd0e391)
#49 0x0000000000bd3bc4 main (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0xbd3bc4)
#50 0x00007e0223829d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#51 0x00007e0223829e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#52 0x0000000000d09985 _start (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0xd09985)
```
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