llvm / llvm/llvm-project

[clang-check][Syntax] Assertion `SM.isBeforeInTranslationUnit(End, InitializerEnd) || End == InitializerEnd` failed in getDeclaratorRange when dumping syntax tree

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clang-tools-extra crash generated by fuzzer
Dominant language
LLVM
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Description

This input is generated by a fuzzer.
```cxx
static const int foo[5];

```

use
```
clang-check
--syntax-tree-dump
-- -xc++ -std=c++23
```
stacktrace:
```
clang-check: /home/ubuntu2404/llvm-project-196067/clang/lib/Tooling/Syntax/BuildTree.cpp:303: clang::SourceRange getDeclaratorRange(const clang::SourceManager&, clang::TypeLoc, clang::SourceLocation, clang::SourceRange): Assertion `SM.isBeforeInTranslationUnit(End, InitializerEnd) || End == InitializerEnd' failed.
#0 0x00005e76e41e81f1 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/ubuntu2404/build-196067-assert/bin/clang-check+0x96d1f1)
#1 0x00005e76e41e4dac llvm::sys::RunSignalHandlers() (/home/ubuntu2404/build-196067-assert/bin/clang-check+0x969dac)
#2 0x00005e76e41e4f0c SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#3 0x000076ee24a45330 (/lib/x86_64-linux-gnu/libc.so.6+0x45330)
#4 0x000076ee24a9eb2c __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
#5 0x000076ee24a9eb2c __pthread_kill_internal ./nptl/pthread_kill.c:78:10
#6 0x000076ee24a9eb2c pthread_kill ./nptl/pthread_kill.c:89:10
#7 0x000076ee24a4527e raise ./signal/../sysdeps/posix/raise.c:27:6
#8 0x000076ee24a288ff abort ./stdlib/abort.c:81:7
#9 0x000076ee24a2881b _nl_load_domain ./intl/loadmsgcat.c:1177:9
#10 0x000076ee24a3b517 (/lib/x86_64-linux-gnu/libc.so.6+0x3b517)
#11 0x00005e76e457eeec (/home/ubuntu2404/build-196067-assert/bin/clang-check+0xd03eec)
#12 0x00005e76e4583958 bool (anonymous namespace)::BuildTreeVisitor::processDeclaratorAndDeclaration(clang::DeclaratorDecl*) BuildTree.cpp:0:0
#13 0x00005e76e4587aea clang::RecursiveASTVisitor<(anonymous namespace)::BuildTreeVisitor>::TraverseDeclContextHelper(clang::DeclContext*) BuildTree.cpp:0:0
#14 0x00005e76e45a083b clang::RecursiveASTVisitor<(anonymous namespace)::BuildTreeVisitor>::TraverseTranslationUnitDecl(clang::TranslationUnitDecl*) BuildTree.cpp:0:0
#15 0x00005e76e4587439 clang::syntax::buildSyntaxTree(clang::syntax::Arena&, clang::syntax::TokenBufferTokenManager&, clang::ASTContext&) (/home/ubuntu2404/build-196067-assert/bin/clang-check+0xd0c439)
#16 0x00005e76e3c7b4af (anonymous namespace)::DumpSyntaxTree::CreateASTConsumer(clang::CompilerInstance&, llvm::StringRef)::Consumer::HandleTranslationUnit(clang::ASTContext&) ClangCheck.cpp:0:0
#17 0x00005e76e5ab1f9c clang::ParseAST(clang::Sema&, bool, bool) (/home/ubuntu2404/build-196067-assert/bin/clang-check+0x2236f9c)
#18 0x00005e76e423f271 clang::FrontendAction::Execute() (/home/ubuntu2404/build-196067-assert/bin/clang-check+0x9c4271)
#19 0x00005e76e428b308 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/home/ubuntu2404/build-196067-assert/bin/clang-check+0xa10308)
#20 0x00005e76e4567cb7 clang::tooling::FrontendActionFactory::runInvocation(std::shared_ptr, clang::FileManager*, std::shared_ptr, clang::DiagnosticConsumer*) (/home/ubuntu2404/build-196067-assert/bin/clang-check+0xceccb7)
#21 0x00005e76e4561b2a clang::tooling::ToolInvocation::runInvocation(char const*, clang::driver::Compilation*, std::shared_ptr, std::shared_ptr) (/home/ubuntu2404/build-196067-assert/bin/clang-check+0xce6b2a)
#22 0x00005e76e45641e2 clang::tooling::ToolInvocation::run() (/home/ubuntu2404/build-196067-assert/bin/clang-check+0xce91e2)
#23 0x00005e76e4565e19 clang::tooling::ClangTool::run(clang::tooling::ToolAction*) (/home/ubuntu2404/build-196067-assert/bin/clang-check+0xceae19)
#24 0x00005e76e3c00405 main (/home/ubuntu2404/build-196067-assert/bin/clang-check+0x385405)
#25 0x000076ee24a2a1ca __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#26 0x000076ee24a2a28b call_init ./csu/../csu/libc-start.c:128:20
#27 0x000076ee24a2a28b __libc_start_main ./csu/../csu/libc-start.c:347:5
#28 0x00005e76e3c7a045 _start (/home/ubuntu2404/build-196067-assert/bin/clang-check+0x3ff045)
Aborted (core dumped)
```

Contributor guide

Open the contributing guide

Research direction

Reproduce the crash with clang-check --syntax-tree-dump on the provided C++ input and options. Then inspect clang/lib/Tooling/Syntax/BuildTree.cpp, especially getDeclaratorRange and processDeclaratorAndDeclaration; done means the syntax-tree dump completes without triggering the assertion.

Written by the indexing model from the issue text.

Assessment

Tech stack
cpp
Domain
compilers, tooling
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
55/100

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