[clang-check][Syntax] Crash in TreeBuilder::getRange: `Range.isValid()` fails when dumping tokens
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- LLVM
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Description
This input is generated by a fuzzer.
```c
#include __FILE__
a (
```
```
clang-check --tokens-dump example.cpp -- -xc++ -std=c++23
```
```
clang-check: /home/ubuntu2404/llvm-project-196067/clang/lib/Tooling/Syntax/BuildTree.cpp:455: llvm::ArrayRef clang::syntax::TreeBuilder::getRange(clang::SourceRange) const: Assertion `Range.isValid()' failed.
#0 0x00005c3a989a01f1 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/ubuntu2404/build-196067-assert/bin/clang-check+0x96d1f1)
#1 0x00005c3a9899cdac llvm::sys::RunSignalHandlers() (/home/ubuntu2404/build-196067-assert/bin/clang-check+0x969dac)
#2 0x00005c3a9899cf0c SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#3 0x00007f10d6445330 (/lib/x86_64-linux-gnu/libc.so.6+0x45330)
#4 0x00007f10d649eb2c __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
#5 0x00007f10d649eb2c __pthread_kill_internal ./nptl/pthread_kill.c:78:10
#6 0x00007f10d649eb2c pthread_kill ./nptl/pthread_kill.c:89:10
#7 0x00007f10d644527e raise ./signal/../sysdeps/posix/raise.c:27:6
#8 0x00007f10d64288ff abort ./stdlib/abort.c:81:7
#9 0x00007f10d642881b _nl_load_domain ./intl/loadmsgcat.c:1177:9
#10 0x00007f10d643b517 (/lib/x86_64-linux-gnu/libc.so.6+0x3b517)
#11 0x00005c3a98d38aa7 (anonymous namespace)::BuildTreeVisitor::WalkUpFromExpr(clang::Expr*) BuildTree.cpp:0:0
#12 0x00005c3a98d494d0 clang::RecursiveASTVisitor<(anonymous namespace)::BuildTreeVisitor>::TraverseStmt(clang::Stmt*, llvm::SmallVectorImpl, llvm::PointerIntPairInfo>>>*) (.constprop.0) BuildTree.cpp:0:0
#13 0x00005c3a98d4ca2d clang::RecursiveASTVisitor<(anonymous namespace)::BuildTreeVisitor>::TraverseObjCBoxedExpr(clang::ObjCBoxedExpr*, llvm::SmallVectorImpl, llvm::PointerIntPairInfo>>>*) BuildTree.cpp:0:0
#14 0x00005c3a98d479be clang::RecursiveASTVisitor<(anonymous namespace)::BuildTreeVisitor>::TraverseStmt(clang::Stmt*, llvm::SmallVectorImpl, llvm::PointerIntPairInfo>>>*) (.constprop.0) BuildTree.cpp:0:0
#15 0x00005c3a98d57dfb clang::RecursiveASTVisitor<(anonymous namespace)::BuildTreeVisitor>::TraverseVarDecl(clang::VarDecl*) BuildTree.cpp:0:0
#16 0x00005c3a98d3faea clang::RecursiveASTVisitor<(anonymous namespace)::BuildTreeVisitor>::TraverseDeclContextHelper(clang::DeclContext*) BuildTree.cpp:0:0
#17 0x00005c3a98d5883b clang::RecursiveASTVisitor<(anonymous namespace)::BuildTreeVisitor>::TraverseTranslationUnitDecl(clang::TranslationUnitDecl*) BuildTree.cpp:0:0
#18 0x00005c3a98d3f439 clang::syntax::buildSyntaxTree(clang::syntax::Arena&, clang::syntax::TokenBufferTokenManager&, clang::ASTContext&) (/home/ubuntu2404/build-196067-assert/bin/clang-check+0xd0c439)
#19 0x00005c3a984334af (anonymous namespace)::DumpSyntaxTree::CreateASTConsumer(clang::CompilerInstance&, llvm::StringRef)::Consumer::HandleTranslationUnit(clang::ASTContext&) ClangCheck.cpp:0:0
#20 0x00005c3a9a269f9c clang::ParseAST(clang::Sema&, bool, bool) (/home/ubuntu2404/build-196067-assert/bin/clang-check+0x2236f9c)
#21 0x00005c3a989f7271 clang::FrontendAction::Execute() (/home/ubuntu2404/build-196067-assert/bin/clang-check+0x9c4271)
#22 0x00005c3a98a43308 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/home/ubuntu2404/build-196067-assert/bin/clang-check+0xa10308)
#23 0x00005c3a98d1fcb7 clang::tooling::FrontendActionFactory::runInvocation(std::shared_ptr, clang::FileManager*, std::shared_ptr, clang::DiagnosticConsumer*) (/home/ubuntu2404/build-196067-assert/bin/clang-check+0xceccb7)
#24 0x00005c3a98d19b2a clang::tooling::ToolInvocation::runInvocation(char const*, clang::driver::Compilation*, std::shared_ptr, std::shared_ptr) (/home/ubuntu2404/build-196067-assert/bin/clang-check+0xce6b2a)
#25 0x00005c3a98d1c1e2 clang::tooling::ToolInvocation::run() (/home/ubuntu2404/build-196067-assert/bin/clang-check+0xce91e2)
#26 0x00005c3a98d1de19 clang::tooling::ClangTool::run(clang::tooling::ToolAction*) (/home/ubuntu2404/build-196067-assert/bin/clang-check+0xceae19)
#27 0x00005c3a983b8405 main (/home/ubuntu2404/build-196067-assert/bin/clang-check+0x385405)
#28 0x00007f10d642a1ca __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#29 0x00007f10d642a28b call_init ./csu/../csu/libc-start.c:128:20
#30 0x00007f10d642a28b __libc_start_main ./csu/../csu/libc-start.c:347:5
#31 0x00005c3a98432045 _start (/home/ubuntu2404/build-196067-assert/bin/clang-check+0x3ff045)
Aborted (core dumped)
```
Contributor guide
Research direction
Start in clang/lib/Tooling/Syntax/BuildTree.cpp at TreeBuilder::getRange, especially the assertion at line 455 and the BuildTreeVisitor path shown in the stack trace. Reproduce the failure with the provided input and clang-check command. Done means this input no longer aborts on the invalid SourceRange while dumping tokens.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 52/100