[PATCH] D139737: [-Wunsafe-buffer-usage] Initiate Fix-it generation for local variable declarations

[Jan Korous via Phabricator via cfe-commits]

jkorous added a comment.

I am sorry I haven't notice this earlier - let's fix this before we land the 
patch.



================
Comment at: clang/lib/Analysis/UnsafeBufferUsage.cpp:690
+  Val.toString(Txt, 10, true);
+  return Txt.data();
+}
----------------
We either need a zero to terminate the string or pass the size of `Txt` to the 
`std::string` constructor here. (While `toString`'s name might sound like it'll 
take care of that it does not.)

Simplified testcase:
```
void local_ptr_to_array() {
  int tmp;
  int a[10];
  int *p = a;
  tmp = p[5];
}
```
what I get is (something like this):
```
void local_ptr_to_array() {
  int tmp;
  int a[10];
  std::span<int> p {a, 10�o
};
  tmp = p[5];
}
```
The problem is that `APInt::toString` stores '1' and '0' to `Txt` but is 
missing the terminating `\0` character that `std::string` constructor expects.



================
Comment at: clang/lib/Analysis/UnsafeBufferUsage.cpp:690
+  Val.toString(Txt, 10, true);
+  return Txt.data();
+}
----------------
jkorous wrote:
> We either need a zero to terminate the string or pass the size of `Txt` to 
> the `std::string` constructor here. (While `toString`'s name might sound like 
> it'll take care of that it does not.)
> 
> Simplified testcase:
> ```
> void local_ptr_to_array() {
>   int tmp;
>   int a[10];
>   int *p = a;
>   tmp = p[5];
> }
> ```
> what I get is (something like this):
> ```
> void local_ptr_to_array() {
>   int tmp;
>   int a[10];
>   std::span<int> p {a, 10�o
};
>   tmp = p[5];
> }
> ```
> The problem is that `APInt::toString` stores '1' and '0' to `Txt` but is 
> missing the terminating `\0` character that `std::string` constructor expects.
> 



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  https://reviews.llvm.org/D139737/new/

https://reviews.llvm.org/D139737

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