| Issue |
173601
|
| Summary |
Assertion in LValue::addUnsizedArray (!isPointerType && !isArrayType) during constexpr eval of dereference on redeclared array with negative size
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
Theaamadu
|
## Compiler Explorer: https://godbolt.org/z/sM56oreaK
- clang start crashing on `Trunk`
- generated by fuzzer
## Console
```console
clang: /root/llvm-project/llvm/tools/clang/lib/AST/ExprConstant.cpp:1679: void {anonymous}::LValue::addUnsizedArray({anonymous}::EvalInfo&, const clang::Expr*, clang::QualType): Assertion `getType(Base).getNonReferenceType()->isPointerType() || getType(Base).getNonReferenceType()->isArrayType()' 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>:5:12: current parser token ';'
2. <source>:3:12: parsing function body 'main'
3. <source>:3:12: in compound statement ('{}')
#0 0x00000000042ecab8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x42ecab8)
#1 0x00000000042e9ee4 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x42e9ee4)
#2 0x000000000422ec88 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x0000793104442520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x00007931044969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x0000793104442476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x00007931044287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x000079310442871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x0000793104439e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x0000000007ce254f (anonymous namespace)::LValue::addUnsizedArray((anonymous namespace)::EvalInfo&, clang::Expr const*, clang::QualType) ExprConstant.cpp:0:0
#10 0x0000000007d7d3ca (anonymous namespace)::PointerExprEvaluator::VisitCastExpr(clang::CastExpr const*) ExprConstant.cpp:0:0
#11 0x0000000007d38aaa clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::PointerExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#12 0x0000000007d3aa6b EvaluatePointer(clang::Expr const*, (anonymous namespace)::LValue&, (anonymous namespace)::EvalInfo&, bool) ExprConstant.cpp:0:0
#13 0x0000000007d419ae clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::LValueExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#14 0x0000000007d426ad EvaluateLValue(clang::Expr const*, (anonymous namespace)::LValue&, (anonymous namespace)::EvalInfo&, bool) ExprConstant.cpp:0:0
#15 0x0000000007d0bf86 Evaluate(clang::APValue&, (anonymous namespace)::EvalInfo&, clang::Expr const*) ExprConstant.cpp:0:0
#16 0x0000000007d0cbbb EvaluateAsRValue((anonymous namespace)::EvalInfo&, clang::Expr const*, clang::APValue&) ExprConstant.cpp:0:0
#17 0x0000000007d1123e clang::Expr::EvaluateForOverflow(clang::ASTContext const&) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x7d1123e)
#18 0x0000000006c59dd6 clang::Sema::CheckForIntOverflow(clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6c59dd6)
#19 0x0000000006ca020c clang::Sema::CheckCompletedExpr(clang::Expr*, clang::SourceLocation, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6ca020c)
#20 0x0000000007048847 clang::Sema::ActOnFinishFullExpr(clang::Expr*, clang::SourceLocation, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x7048847)
#21 0x0000000007380eee clang::Sema::BuildReturnStmt(clang::SourceLocation, clang::Expr*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x7380eee)
#22 0x0000000007381c77 clang::Sema::ActOnReturnStmt(clang::SourceLocation, clang::Expr*, clang::Scope*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x7381c77)
#23 0x0000000006b171da clang::Parser::ParseReturnStatement() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6b171da)
#24 0x0000000006b1b61d 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+0x6b1b61d)
#25 0x0000000006b1c536 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 24u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::LabelDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6b1c536)
#26 0x0000000006b24e7e clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6b24e7e)
#27 0x0000000006b256ca clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6b256ca)
#28 0x0000000006a2b62b clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a2b62b)
#29 0x0000000006a61aed 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+0x6a61aed)
#30 0x0000000006a1e78b clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a1e78b)
#31 0x0000000006a1ef7f clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a1ef7f)
#32 0x0000000006a26daa clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a26daa)
#33 0x0000000006a27d45 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a27d45)
#34 0x0000000006a08dca clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a08dca)
#35 0x0000000004c4dde8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4c4dde8)
#36 0x0000000004f446e5 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4f446e5)
#37 0x0000000004ec497e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4ec497e)
#38 0x000000000503ea6d clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x503ea6d)
#39 0x0000000000de5b4c cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xde5b4c)
#40 0x0000000000ddc59a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#41 0x0000000000ddc71d 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
#42 0x0000000004cc0739 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 0x000000000422f124 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x422f124)
#44 0x0000000004cc0d4f 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 0x0000000004c81832 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4c81832)
#46 0x0000000004c827de 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+0x4c827de)
#47 0x0000000004c89c35 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4c89c35)
#48 0x0000000000de1f41 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xde1f41)
#49 0x0000000000c8cf94 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xc8cf94)
#50 0x0000793104429d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#51 0x0000793104429e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#52 0x0000000000ddc035 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xddc035)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```
## Code
```c
int a[-39];
int main() {
extern int a[];
return *a;
}
```
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