[clang][bytecode] assertion failure when accessing vector element with nested cast/initializer in C #158482
Description
Reproducer:
https://godbolt.org/z/1ThGnnno4
typedef unsigned char U __attribute__((vector_size(1)));
void foo(U f) { f[0] = f[((U)(U){0})[0]]; }Backtrace:
clang++: /root/llvm-project/llvm/tools/clang/lib/AST/ByteCode/InterpStack.h:41: T clang::interp::InterpStack::pop() [with T = clang::interp::Integral<8, false>]: Assertion `ItemTypes.back() == toPrimType<T>()' 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 -x c -fexperimental-new-constant-interpreter <source>
1. <source>:3:41: current parser token ';'
2. <source>:3:15: parsing function body 'foo'
3. <source>:3:15: in compound statement ('{}')
#0 0x0000000004177998 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4177998)
#1 0x0000000004174dc4 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4174dc4)
#2 0x00000000040b9368 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x000076ccb0842520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x000076ccb08969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x000076ccb0842476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x000076ccb08287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x000076ccb082871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x000076ccb0839e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x0000000007b52b85 (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7b52b85)
#10 0x0000000007b7925f clang::interp::EvalEmitter::emitRet(clang::interp::PrimType, clang::interp::SourceInfo const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7b7925f)
#11 0x0000000007f7dcc9 clang::interp::Compiler<clang::interp::EvalEmitter>::visitExpr(clang::Expr const*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7f7dcc9)
#12 0x0000000007b1edfd clang::interp::EvalEmitter::interpretExpr(clang::Expr const*, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7b1edfd)
#13 0x0000000007aed243 clang::interp::Context::evaluateAsRValue(clang::interp::State&, clang::Expr const*, clang::APValue&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7aed243)
#14 0x0000000007a63e23 EvaluateAsRValue((anonymous namespace)::EvalInfo&, clang::Expr const*, clang::APValue&) ExprConstant.cpp:0:0
#15 0x0000000007a6890e EvaluateAsInt(clang::Expr const*, clang::Expr::EvalResult&, clang::ASTContext const&, clang::Expr::SideEffectsKind, (anonymous namespace)::EvalInfo&) ExprConstant.cpp:0:0
#16 0x0000000007a68c77 clang::Expr::EvaluateAsInt(clang::Expr::EvalResult&, clang::ASTContext const&, clang::Expr::SideEffectsKind, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7a68c77)
#17 0x0000000006a88a8d clang::Sema::CheckArrayAccess(clang::Expr const*, clang::Expr const*, clang::ArraySubscriptExpr const*, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a88a8d)
#18 0x0000000006a89e9f clang::Sema::CheckArrayAccess(clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a89e9f)
#19 0x0000000006d8a94d clang::Sema::CreateBuiltinBinOp(clang::SourceLocation, clang::BinaryOperatorKind, clang::Expr*, clang::Expr*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6d8a94d)
#20 0x0000000006d8c698 clang::Sema::BuildBinOp(clang::Scope*, clang::SourceLocation, clang::BinaryOperatorKind, clang::Expr*, clang::Expr*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6d8c698)
#21 0x0000000006d8cd06 clang::Sema::ActOnBinOp(clang::Scope*, clang::SourceLocation, clang::tok::TokenKind, clang::Expr*, clang::Expr*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6d8cd06)
#22 0x00000000068c6f1a clang::Parser::ParseRHSOfBinaryExpression(clang::ActionResult<clang::Expr*, true>, clang::prec::Level) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x68c6f1a)
#23 0x00000000068ca539 clang::Parser::ParseExpression(clang::TypoCorrectionTypeBehavior) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x68ca539)
#24 0x000000000694e539 clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x694e539)
#25 0x00000000069458c4 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+++0x69458c4)
#26 0x0000000006946739 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 24u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::LabelDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6946739)
#27 0x000000000694ec4e clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x694ec4e)
#28 0x000000000694f46a clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x694f46a)
#29 0x000000000685656b clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x685656b)
#30 0x000000000688c9cd 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+++0x688c9cd)
#31 0x000000000684933e clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x684933e)
#32 0x0000000006849adf clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6849adf)
#33 0x000000000685191a clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x685191a)
#34 0x00000000068528b5 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x68528b5)
#35 0x000000000683332a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x683332a)
#36 0x0000000004ab1438 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4ab1438)
#37 0x0000000004dab495 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4dab495)
#38 0x0000000004d2682e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4d2682e)
#39 0x0000000004ea0281 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4ea0281)
#40 0x0000000000db5abf cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdb5abf)
#41 0x0000000000dac72a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#42 0x0000000004b1a3c9 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 0x00000000040b9804 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x40b9804)
#44 0x0000000004b1a9df 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 0x0000000004adb5bd clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4adb5bd)
#46 0x0000000004adc64e 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+++0x4adc64e)
#47 0x0000000004ae45e5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4ae45e5)
#48 0x0000000000db1f45 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdb1f45)
#49 0x0000000000c63e84 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc63e84)
#50 0x000076ccb0829d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#51 0x000076ccb0829e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#52 0x0000000000dac1d5 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdac1d5)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134