| Issue |
180902
|
| Summary |
[clangd] "Show AST" crashes on some code with templates
|
| Labels |
clangd
|
| Assignees |
|
| Reporter |
ArcsinX
|
The problem can be reproduced on the main branch and looks like a regression (works ok on 21.1.8, I didn't try other versions)
Code
```cpp
template <typename T>
struct Foo {
template <typename U>
struct Bar { static U Value; };
};
template <typename V, typename W>
auto foo() {
return Foo<V>::template Bar<W>::Value;
}
```
Trace
```
#0 0x0000555c2b844140 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/llvm-project/build_clang/bin/clangd+0x49f140)
#1 0x0000555c2b8410cd SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#2 0x00007f0737f37520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#3 0x0000555c2bdb9832 clang::TemplateName::getKind() const (/llvm-project/build_clang/bin/clangd+0xa14832)
#4 0x0000555c2ce04ef8 clang::clangd::(anonymous namespace)::DumpVisitor::TraverseTemplateName(clang::TemplateName const&) DumpAST.cpp:0:0
#5 0x0000555c2ce106a7 clang::RecursiveASTVisitor<clang::clangd::(anonymous namespace)::DumpVisitor>::TraverseTypeLoc(clang::TypeLoc, bool) (.isra.0) DumpAST.cpp:0:0
#6 0x0000555c2ce17575 clang::RecursiveASTVisitor<clang::clangd::(anonymous namespace)::DumpVisitor>::TraverseNestedNameSpecifierLoc(clang::NestedNameSpecifierLoc) (.isra.0) DumpAST.cpp:0:0
#7 0x0000555c2ce17f5f clang::clangd::(anonymous namespace)::DumpVisitor::TraverseNestedNameSpecifierLoc(clang::NestedNameSpecifierLoc) DumpAST.cpp:0:0
#8 0x0000555c2ce09fda clang::RecursiveASTVisitor<clang::clangd::(anonymous namespace)::DumpVisitor>::dataTraverseNode(clang::Stmt*, llvm::SmallVectorImpl<llvm::PointerIntPair<clang::Stmt*, 1u, bool, llvm::PointerLikeTypeTraits<clang::Stmt*>, llvm::PointerIntPairInfo<clang::Stmt*, 1u, llvm::PointerLikeTypeTraits<clang::Stmt*> > > >*) DumpAST.cpp:0:0
#9 0x0000555c2ce0f031 clang::RecursiveASTVisitor<clang::clangd::(anonymous namespace)::DumpVisitor>::TraverseStmt(clang::Stmt*, llvm::SmallVectorImpl<llvm::PointerIntPair<clang::Stmt*, 1u, bool, llvm::PointerLikeTypeTraits<clang::Stmt*>, llvm::PointerIntPairInfo<clang::Stmt*, 1u, llvm::PointerLikeTypeTraits<clang::Stmt*> > > >*) (.constprop.0) DumpAST.cpp:0:0
#10 0x0000555c2ce18c1c clang::clangd::dumpAST(clang::DynTypedNode const&, clang::syntax::TokenBuffer const&, clang::ASTContext const&) (/llvm-project/build_clang/bin/clangd+0x1a73c1c)
#11 0x0000555c2cd7e151 bool llvm::function_ref<bool (clang::clangd::SelectionTree)>::callback_fn<clang::clangd::ClangdServer::getAST(llvm::StringRef, std::optional<clang::clangd::Range>, llvm::unique_function<void (llvm::Expected<std::optional<clang::clangd::ASTNode> >)>)::'lambda'(llvm::Expected<clang::clangd::InputsAndAST>)::operator()(llvm::Expected<clang::clangd::InputsAndAST>)::'lambda'(clang::clangd::SelectionTree)>(long, clang::clangd::SelectionTree) ClangdServer.cpp:0:0
#12 0x0000555c2cf33bfb clang::clangd::SelectionTree::createEach(clang::ASTContext&, clang::syntax::TokenBuffer const&, unsigned int, unsigned int, llvm::function_ref<bool (clang::clangd::SelectionTree)>) (/llvm-project/build_clang/bin/clangd+0x1b8ebfb)
#13 0x0000555c2cd7ef6c clang::clangd::ClangdServer::getAST(llvm::StringRef, std::optional<clang::clangd::Range>, llvm::unique_function<void (llvm::Expected<std::optional<clang::clangd::ASTNode> >)>)::'lambda'(llvm::Expected<clang::clangd::InputsAndAST>)::operator()(llvm::Expected<clang::clangd::InputsAndAST>) ClangdServer.cpp:0:0
#14 0x0000555c2cd7f461 void llvm::detail::UniqueFunctionBase<void, llvm::Expected<clang::clangd::InputsAndAST> >::CallImpl<clang::clangd::ClangdServer::getAST(llvm::StringRef, std::optional<clang::clangd::Range>, llvm::unique_function<void (llvm::Expected<std::optional<clang::clangd::ASTNode> >)>)::'lambda'(llvm::Expected<clang::clangd::InputsAndAST>)>(void*, llvm::Expected<clang::clangd::InputsAndAST>&) ClangdServer.cpp:0:0
#15 0x0000555c2cfab18a clang::clangd::(anonymous namespace)::ASTWorker::runWithAST(llvm::StringRef, llvm::unique_function<void (llvm::Expected<clang::clangd::InputsAndAST>)>, clang::clangd::TUScheduler::ASTActionInvalidation)::'lambda'()::operator()() TUScheduler.cpp:0:0
#16 0x0000555c2cfa0837 clang::clangd::(anonymous namespace)::ASTWorker::runTask(llvm::StringRef, llvm::function_ref<void ()>) (.constprop.0) TUScheduler.cpp:0:0
#17 0x0000555c2cfa231a clang::clangd::(anonymous namespace)::ASTWorker::run() TUScheduler.cpp:0:0
#18 0x0000555c2d173026 void* llvm::thread::ThreadProxy<std::tuple<clang::clangd::AsyncTaskRunner::runAsync(llvm::Twine const&, llvm::unique_function<void ()>)::'lambda0'()> >(void*) Threading.cpp:0:0
#19 0x00007f0737f89ac3 start_thread ./nptl/./nptl/pthread_create.c:442:8
#20 0x00007f073801b8d0 ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:83:0
Signalled during AST worker action: GetAST
```
clang functionality to dump AST (from the same commit) works correctly (i.e. `clang++ -Xclang -ast-dump -fsyntax-only test.cxx` doesn't lead to a crash )
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