| Issue |
64701
|
| Summary |
[clang-format] Segmentation fault when formatting nested namespaces
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
d0nc1h0t
|
When formatting this part of the code:
```
namespace ns1 { namespace ns2 { namespace ns3 {
void func_in_ns() {
int res{ 0 };
// block for debug mode
#ifndef NDEBUG
#endif
}
}}}
```
with the following style settings:
```
---
Language: Cpp
BasedOnStyle: LLVM
CompactNamespaces: true
NamespaceIndentation: Inner
```
clang-format crashes with an error segmentation fault. As I found out, this is due to the overflow of the Level value for the comment line. Overflow occurs in line 393 of the file clang/lib/Format/UnwrappedLineFormatter.cpp:
```
...
if (!(*CompactedLine)->InPPDirective)
(*CompactedLine)->Level -= OutdentBy;
...
```
OutdentBy turns out to be greater than the value (*CompactedLine)->Level, which causes an overflow.
I see the following way to solve the problem:
```
...
if (!(*CompactedLine)->InPPDirective)
(*CompactedLine)->Level -= std:min(OutdentBy, (*CompactedLine)->Level);
...
```
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