| Issue |
182575
|
| Summary |
Using `__builtin_counted_by_ref` on a struct defined within another struct crashes Clang
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
kees
|
```C
#include <stdlib.h>
struct outer {
struct inner {
int counter;
int ent[] __attribute__((__counted_by__(counter)));
} *entries;
};
struct inner *test(int count);
struct inner *test(int count)
{
struct inner *entries = malloc(sizeof(*entries) + count * sizeof(*entries->ent));
if (entries)
*__builtin_counted_by_ref(entries->ent) = count;
return entries;
}
```
This crashes Clang, but only if `struct inner` is defined within another struct:
```
...
#2 0x00005d5eab1e1b48 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x000075c96dffb8d0 (/lib/x86_64-linux-gnu/libc.so.6+0x458d0)
#4 0x00005d5eab6a31bd clang::CodeGen::CodeGenFunction::EmitStoreOfScalar(llvm::Value*, clang::CodeGen::Address, bool, clang::QualType, clang::CodeGen::LValueBaseInfo, clang::CodeGen::TBAAAccessInfo, bool, bool) (/srv/built-compilers/llvm/x86-ceb3b4cea7fd424be738609c2d9938c846445ec6/install/bin/clang-23+0x2ece1bd)
#5 0x00005d5eab6aff1f clang::CodeGen::CodeGenFunction::EmitStoreThroughLValue(clang::CodeGen::RValue, clang::CodeGen::LValue, bool) (/srv/built-compilers/llvm/x86-ceb3b4cea7fd424be738609c2d9938c846445ec6/install/bin/clang-23+0x2edaf1f)
#6 0x00005d5eab734d5c (anonymous namespace)::ScalarExprEmitter::VisitBinAssign(clang::BinaryOperator const*) CGExprScalar.cpp:0:0
#7 0x00005d5eab72f8ce clang::CodeGen::CodeGenFunction::EmitScalarExpr(clang::Expr const*, bool) (/srv/built-compilers/llvm/x86-ceb3b4cea7fd424be738609c2d9938c846445ec6/install/bin/clang-23+0x2f5a8ce)
...
```
cc @bwendling
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