| Issue |
56056
|
| Summary |
[GNU ObjC] Clang 14 regression: access violation when building with ARC and optimization
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
triplef
|
Building the following Objective-C code using using Automatic Reference Counting and the GNU Objective-C 2.0 runtime and `-O1` or better optimization using Clang 14.0.5 causes an access violation at runtime.
This does not happen with Clang 13.0.1, or when using `-O0`, or when not using ARC.
```objc
#import "objc/runtime.h"
__attribute__((objc_root_class))
@interface Test {
id isa;
}
+ (id)new;
@end
@implementation Test
+ (id)new {
return class_createInstance(self, 0);
}
@end
int main(void) {
[Test new];
return 0;
}
```
Building:
```
"C:\Program Files\LLVM-14\bin\clang" -IC:\libobjc2\include -LC:\libobjc2\lib -fobjc-runtime=gnustep-2.0 -fobjc-arc -fuse-ld=lld -lobjc -O2 -o test.exe test.m
```
Result:
```
* thread #1, stop reason = Exception 0xc0000005 encountered at address 0x7ffb16aea405: Access violation reading location 0xffffffffffffffff
frame #0: 0x00007ffb16aea405 objc.dll`objc_retain + 149
objc.dll`objc_retain:
-> 0x7ffb16aea405 <+149>: movq (%rax), %rcx
0x7ffb16aea408 <+152>: movl $0x4000, %edx ; imm = 0x4000
0x7ffb16aea40d <+157>: callq 0x7ffb16aeacb0 ; objc_storeWeak + 1472
0x7ffb16aea412 <+162>: movl %eax, 0x54(%rsp)
```
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