| Issue |
89968
|
| Summary |
ER: Add diagnostic to flag using "%P" specifier with Objective-C pointers
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
jaredgrubb
|
Darwin has an extension on the printf format-specifiers for "%P", which dumps the bytes at a pointer (in contrast to "%p" which dumps a pointer's value itself) and is allowed in "OS Log" contexts.
It's easy to misuse this, for example:
```
NSUUID *uuid = ...;
os_log(..., "%{uuid_t}.16P", uuid);
```
This dumps the ObjC class data (eg, the _is-a_ pointer) -- not the UUID represented by the object.
It'd be nice if the compiler had a warning that could flag this misuse, which seems to always (IMO) be a bug.
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