| Issue |
54739
|
| Summary |
truncation in conversion from uint64_t to size_t
|
| Labels |
|
| Assignees |
|
| Reporter |
msebor
|
As pointed out in https://reviews.llvm.org/D122836#3423517, passing the `uint64_t` result of `getZExtValue()` to `StringRef::substr(size_t, size_t)` as is done below might silently truncate the value in ILP32. This is just a reminder to review and fix that and any other calls like it.
```
lib/Transforms/Utils/SimplifyLibCalls.cpp: Str = Str.substr(0, LenC->getZExtValue());
```
It looks like the code in `DWARFUnit::tryExtractDIEsIfNeeded` in `llvm/lib/DebugInfo/DWARF/DWARFUnit.cpp` might be subject to the sametruncation:
```
if (auto *IndexEntry = Header.getIndexEntry())
if (const auto *C = IndexEntry->getContribution(
Header.getVersion() >= 5 ? DW_SECT_LOCLISTS : DW_SECT_EXT_LOC))
Data = "" C->Length);
```
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