| Issue |
151430
|
| Summary |
[TableGen] ASAN reports use-after-poison in StringInit::get, when used with BumpPtrAllocator
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
chanha-park
|
I've encountered an use-after-poison issue, while generating header using my own `.td` file and `llvm::TableGenMain`.
The below is the reduced input.
```cpp
#include "llvm/Support/Allocator.h"
#include "llvm/TableGen/Record.h"
namespace dummy_ns {
// unused function
auto dummy_allocate(llvm::BumpPtrAllocator &allocator) {
return allocator.Allocate(1, 16);
}
} // namespace dummy_ns
int main() {
llvm::RecordKeeper records;
auto foo = llvm::StringInit::get(records, "foo");
auto bar = llvm::StringInit::get(records, "bar");
}
```
compiled with `clang++ main.cc -lLLVMTableGen -lLLVMSupport -lLLVMDemangle -fsanitize=address -fno-rtti`
The second `StringInit::get` causes use-after-poison.
Even though `dummy_allocate` is unused, the error is gone when I remove that function.
is this just false-positive?
Tested with libLLVM built in Release build, with sanitizer disabled.
I tested it in llvmorg-20.1.4 tag && main branch.
and reproducer in compiler-explorer: https://godbolt.org/z/rhYsK983j
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