| Issue |
166166
|
| Summary |
[clang]Clang assertion failure in constant _expression_ evaluation for template static const member with invalid function call initializer
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
Attacker23
|
The following code has been causing Clang to crash since version 17.0.1 and still does in the current trunk (x86‑64).
```cpp
bool A(){return true;}
template<typename T> struct X{static const bool f;};
template<typename T> const bool X<T>::f (A (1));
int main (){
X<int> a;
if (!a.f) return 1;
return 0;
}
```
**Output:**
```
<source>:5:42: error: no matching function for call to 'A'
5 | template<typename T> const bool X<T>::f (A (1));
| ^
<source>:1:6: note: candidate function not viable: requires 0 arguments, but 1 was provided
1 | bool A(){return true;}
| ^
clang++: /root/llvm-project/llvm/tools/clang/lib/AST/ExprConstant.cpp:3567: bool evaluateVarDeclInit({anonymous}::EvalInfo&, const clang::Expr*, const clang::VarDecl*, {anonymous}::CallStackFrame*, unsigned int, clang::APValue*&): Assertion `!VD->mightBeUsableInConstantExpressions(Info.Ctx)' failed.
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-trunk/bin/clang++ -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics <source>
1. <source>:9:11: current parser token ')'
2. <source>:7:12: parsing function body 'main'
3. <source>:7:12: in compound statement ('{}')
#0 0x0000000004239d18 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4239d18)
#1 0x0000000004237144 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4237144)
#2 0x000000000417b398 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x0000789498a42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x0000789498a969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x0000789498a42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x0000789498a287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x0000789498a2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x0000789498a39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x0000000007bd423e (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7bd423e)
#10 0x0000000007bd4c0b findCompleteObject((anonymous namespace)::EvalInfo&, clang::Expr const*, clang::AccessKinds, (anonymous namespace)::LValue const&, clang::QualType) ExprConstant.cpp:0:0
#11 0x0000000007be8a55 handleLValueToRValueConversion((anonymous namespace)::EvalInfo&, clang::Expr const*, clang::QualType, (anonymous namespace)::LValue const&, clang::APValue&, bool) ExprConstant.cpp:0:0
#12 0x0000000007c488a4 (anonymous namespace)::IntExprEvaluator::VisitCastExpr(clang::CastExpr const*) ExprConstant.cpp:0:0
#13 0x0000000007c012eb clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::IntExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#14 0x0000000007bf06de Evaluate(clang::APValue&, (anonymous namespace)::EvalInfo&, clang::Expr const*) ExprConstant.cpp:0:0
#15 0x0000000007bf8638 EvaluateAsBooleanCondition(clang::Expr const*, bool&, (anonymous namespace)::EvalInfo&) ExprConstant.cpp:0:0
#16 0x0000000007c031aa (anonymous namespace)::IntExprEvaluator::VisitUnaryOperator(clang::UnaryOperator const*) ExprConstant.cpp:0:0
#17 0x0000000007c0267b clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::IntExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#18 0x0000000007bf06de Evaluate(clang::APValue&, (anonymous namespace)::EvalInfo&, clang::Expr const*) ExprConstant.cpp:0:0
#19 0x0000000007bf0fdb EvaluateAsRValue((anonymous namespace)::EvalInfo&, clang::Expr const*, clang::APValue&) ExprConstant.cpp:0:0
#20 0x0000000007bf4c0e clang::Expr::EvaluateForOverflow(clang::ASTContext const&) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7bf4c0e)
#21 0x0000000006b83d36 clang::Sema::CheckForIntOverflow(clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b83d36)
#22 0x0000000006bc65fc clang::Sema::CheckCompletedExpr(clang::Expr*, clang::SourceLocation, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6bc65fc)
#23 0x0000000006f69257 clang::Sema::ActOnFinishFullExpr(clang::Expr*, clang::SourceLocation, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6f69257)
#24 0x0000000006eb6550 clang::Sema::ActOnCondition(clang::Scope*, clang::SourceLocation, clang::Expr*, clang::Sema::ConditionKind, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6eb6550)
#25 0x00000000069d7abc clang::Parser::ParseCXXCondition(clang::ActionResult<clang::Stmt*, true>*, clang::SourceLocation, clang::Sema::ConditionKind, bool, clang::Parser::ForRangeInfo*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69d7abc)
#26 0x0000000006a3f82b clang::Parser::ParseParenExprOrCondition(clang::ActionResult<clang::Stmt*, true>*, clang::Sema::ConditionResult&, clang::SourceLocation, clang::Sema::ConditionKind, clang::SourceLocation&, clang::SourceLocation&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a3f82b)
#27 0x0000000006a446d6 clang::Parser::ParseIfStatement(clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a446d6)
#28 0x0000000006a4207a clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 24u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::LabelDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a4207a)
#29 0x0000000006a43089 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 24u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::LabelDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a43089)
#30 0x0000000006a4b816 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a4b816)
#31 0x0000000006a4c02a clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a4c02a)
#32 0x00000000069529fb clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69529fb)
#33 0x0000000006988edd clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6988edd)
#34 0x00000000069461ae clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69461ae)
#35 0x000000000694694f clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x694694f)
#36 0x000000000694e203 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x694e203)
#37 0x000000000694f115 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x694f115)
#38 0x000000000693079a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x693079a)
#39 0x0000000004b84e58 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4b84e58)
#40 0x0000000004e72a45 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4e72a45)
#41 0x0000000004df384e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4df384e)
#42 0x0000000004f6b21d clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4f6b21d)
#43 0x0000000000dd0670 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdd0670)
#44 0x0000000000dc71da ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#45 0x0000000000dc735d int llvm::function_ref<int (llvm::SmallVectorImpl<char const*>&)>::callback_fn<clang_main(int, char**, llvm::ToolContext const&)::'lambda'(llvm::SmallVectorImpl<char const*>&)>(long, llvm::SmallVectorImpl<char const*>&) driver.cpp:0:0
#46 0x0000000004bee6f9 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
#47 0x000000000417b834 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x417b834)
#48 0x0000000004beed0f 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
#49 0x0000000004bafaa2 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4bafaa2)
#50 0x0000000004bb0a4e clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4bb0a4e)
#51 0x0000000004bb8185 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4bb8185)
#52 0x0000000000dccb99 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdccb99)
#53 0x0000000000c7bb64 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc7bb64)
#54 0x0000789498a29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#55 0x0000789498a29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#56 0x0000000000dc6c75 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdc6c75)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```
see: https://godbolt.org/z/zssGzo1f1
**Conditions required to trigger the crash:**
1. Template
2. Const static member
3. Invalid function call in initializer (signature mismatch or otherwise invalid)
4. A context that forces constant evaluation, such as:
* `if (~a.f)`
* `switch (+a.f)`
* `int arr[a.f];`
---
**Additional cases that also crash:**
```cpp
bool A(int i) { return true; }// also crashes
template<typename T> struct X { static const bool f; };
template<typename T> const bool X<T>::f(A());
int main() {
X<int> a;
if (~a.f) return 1;
return 0;
}
```
https://godbolt.org/z/7cr5o3q5s
and:
```cpp
void A() { return true; }// also crashes
template<typename T> struct X { static const bool f; };
template<typename T> const bool X<T>::f(A());
int main() {
X<int> a;
if (!a.f) return 1;
return 0;
}
```
https://godbolt.org/z/8hrhrYGd1
**Another example:**
```cpp
void A() { return true; }
template<typename T>
struct X {
inline static const int f = A();
};
int main() {
X<int> a;
int arr[a.f]; // also crashes
}
```
https://godbolt.org/z/Y9qddaz4z
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