| Issue |
78922
|
| Summary |
[Coverage][MC/DC] Wrong BitmapIdx calculation in `getMaxBitmapSize`
|
| Labels |
new issue
|
| Assignees |
evodius96
|
| Reporter |
chapuni
|
In `CoverageMapping.cpp:getMaxBitmapSize`,
https://github.com/llvm/llvm-project/commit/8ecbb0404d740d1ab173554e47cef39cd5e3ef8c#diff-44b7cba1a9d87f9ec9e067d93ea9d29ea4d9c669942d73f89233e39e28f9a5f0R565-R581
This assumes the last `Decision` has the maximum `BitmapIdx`. It is not true.
It may crash`llvm-cov` with unexpected test vector.
(https://godbolt.org/z/5bGYa8foe)
```
#define RANGE(a,b,c) ((a) <= (b) && (b) <= (c))
int foo(int c) {
if (RANGE('A', c, 'F')) return 1;
return ('0' <= c && c <= '9');
}
```
```
foo:
(snip)
Expansion,File 0, 4:7 -> 4:12 = #0 (Expanded file = 1)
(snip)
Decision,File 0, 5:11 -> 5:31 = M:1, C:2
(snip)
Decision,File 1, 1:23 -> 1:47 = M:0, C:2
(snip)
```
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