| Issue |
184324
|
| Summary |
[Clang] preprocessor assertion failure after parse errors involving decltype
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
YuchangSu
|
Code:
```CPP
a decltype ]b
```
This regression since Clang-22
Assertion:
```
clang++: /root/llvm-project/llvm/tools/clang/lib/Lex/PPCaching.cpp:151: void clang::Preprocessor::AnnotatePreviousCachedTokens(const clang::Token&): Assertion `CachedTokens[CachedLexPos-1].getLastLoc() == Tok.getAnnotationEndLoc() && "The annotation should be until the most recent cached token"' failed.
```
Backtrace:
```
#0 0x000000000440c2b8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x440c2b8)
#1 0x0000000004409704 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4409704)
#2 0x0000000004349508 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x000072f6a7042520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x000072f6a70969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x000072f6a7042476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x000072f6a70287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x000072f6a702871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x000072f6a7039e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x000000000863996d clang::Preprocessor::AnnotatePreviousCachedTokens(clang::Token const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x863996d)
#10 0x0000000006c78c96 clang::Parser::ParseOptionalCXXScopeSpecifier(clang::CXXScopeSpec&, clang::OpaquePtr<clang::QualType>, bool, bool, bool*, bool, clang::IdentifierInfo const**, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6c78c96)
#11 0x0000000006c25835 clang::Parser::ParseDeclaratorInternal(clang::Declarator&, void (clang::Parser::*)(clang::Declarator&)) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6c25835)
#12 0x0000000008713061 clang::StackExhaustionHandler::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x8713061)
#13 0x0000000006c286ef 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+++0x6c286ef)
#14 0x0000000006be6bab clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6be6bab)
#15 0x0000000006be73af clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6be73af)
#16 0x0000000006bee9b1 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6bee9b1)
#17 0x0000000006bef8e5 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6bef8e5)
#18 0x0000000006befcd0 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6befcd0)
#19 0x0000000006bd0f93 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6bd0f93)
#20 0x0000000004ee57f8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4ee57f8)
#21 0x00000000051ebf75 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x51ebf75)
#22 0x000000000516a17e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x516a17e)
#23 0x00000000052e788d clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x52e788d)
#24 0x0000000000df08a4 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdf08a4)
#25 0x0000000000de721a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#26 0x0000000000de739d 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
#27 0x0000000004f59f59 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
#28 0x0000000004349944 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4349944)
#29 0x0000000004f5a56f 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
#30 0x0000000004f1a252 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4f1a252)
#31 0x0000000004f1b1fe 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+++0x4f1b1fe)
#32 0x0000000004f22f45 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4f22f45)
#33 0x0000000000decc2a clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdecc2a)
#34 0x0000000000ca4dba main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xca4dba)
#35 0x000072f6a7029d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#36 0x000072f6a7029e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#37 0x0000000000de6cb5 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xde6cb5)
```
See Compiler Explorer: [https://godbolt.org/z/4TvEWToeM](https://godbolt.org/z/4TvEWToeM)
The test case was generated by a fuzzer.
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