| Issue |
137417
|
| Summary |
Static analyzer crashes using std::bit_cast _expression_
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
ddkilzer
|
The clang static analyzer crashes using a `std::bit_cast` _expression_:
```
#include <string>
static bool crash(std::string* x)
{
return x == std::bit_cast<std::string*>(static_cast<intptr_t>(-1));
}
```
Godbolt: <https://godbolt.org/z/8PYYEW156>
```
clang++: warning: argument unused during compilation: '-S' [-Wunused-command-line-argument]
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-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++2a -stdlib=libc++ --analyze <source>
1. <eof> parser at end of file
2. While analyzing stack:
#0 Calling crash(std::string *)
3. <source>:5:12: Error evaluating statement
4. <source>:5:12: Error evaluating 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 0x0000702688642520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x0000000006255ab7 (anonymous namespace)::SimpleSValBuilder::evalBinOpLN(llvm::IntrusiveRefCntPtr<clang::ento::ProgramState const>, clang::BinaryOperatorKind, clang::ento::Loc, clang::ento::NonLoc, clang::QualType) SimpleSValBuilder.cpp:0:0
#5 0x0000000006266819 clang::ento::SValBuilder::evalBinOp(llvm::IntrusiveRefCntPtr<clang::ento::ProgramState const>, clang::BinaryOperatorKind, clang::ento::SVal, clang::ento::SVal, clang::QualType) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x6266819)
#6 0x0000000006198abf clang::ento::ExprEngine::VisitBinaryOperator(clang::BinaryOperator const*, clang::ento::ExplodedNode*, clang::ento::ExplodedNodeSet&) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x6198abf)
#7 0x000000000617d177 clang::ento::ExprEngine::Visit(clang::Stmt const*, clang::ento::ExplodedNode*, clang::ento::ExplodedNodeSet&) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x617d177)
#8 0x000000000617d4f5 clang::ento::ExprEngine::ProcessStmt(clang::Stmt const*, clang::ento::ExplodedNode*) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x617d4f5)
#9 0x000000000618bc72 clang::ento::ExprEngine::processCFGElement(clang::CFGElement, clang::ento::ExplodedNode*, unsigned int, clang::ento::NodeBuilderContext*) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x618bc72)
#10 0x00000000061361fd clang::ento::CoreEngine::dispatchWorkItem(clang::ento::ExplodedNode*, clang::ProgramPoint, clang::ento::WorkListUnit const&) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x61361fd)
#11 0x0000000006136444 clang::ento::CoreEngine::ExecuteWorkList(clang::LocationContext const*, unsigned int, llvm::IntrusiveRefCntPtr<clang::ento::ProgramState const>) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x6136444)
#12 0x0000000005d3331d (anonymous namespace)::AnalysisConsumer::HandleCode(clang::Decl*, unsigned int, clang::ento::ExprEngine::InliningModes, llvm::DenseSet<clang::Decl const*, llvm::DenseMapInfo<clang::Decl const*, void>>*) AnalysisConsumer.cpp:0:0
#13 0x0000000005d34449 (anonymous namespace)::AnalysisConsumer::HandleTranslationUnit(clang::ASTContext&) AnalysisConsumer.cpp:0:0
#14 0x00000000062c3aec clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x62c3aec)
#15 0x0000000004682ca1 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x4682ca1)
#16 0x000000000460260b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x460260b)
#17 0x000000000476e173 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x476e173)
#18 0x0000000000d116c1 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0xd116c1)
#19 0x0000000000d09eed ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#20 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
#21 0x00000000039a6e13 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0x39a6e13)
#22 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
#23 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)
#24 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)
#25 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)
#26 0x0000000000d0e391 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0xd0e391)
#27 0x0000000000bd3bc4 main (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0xbd3bc4)
#28 0x0000702688629d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#29 0x0000702688629e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#30 0x0000000000d09985 _start (/opt/compiler-explorer/clang-20.1.0/bin/clang+++0xd09985)
clang++: error: clang frontend command failed with exit code 139 (use -v to see invocation)
Compiler returned: 139
```
Also tracked as <rdar://144714840>.
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