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[SourceManager] Explicitly check for potential iterator underflow 

Differential Revision: https://reviews.llvm.org/D86231
This commit is contained in:
Jan Korous 2020-08-18 22:36:16 -07:00
parent a4e35cc2ec
commit ae726fecae
1 changed files with 5 additions and 0 deletions
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5
clang/lib/Basic/SourceManager.cpp
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@ -1936,6 +1936,11 @@ SourceManager::getMacroArgExpandedLocation(SourceLocation Loc) const {
assert(!MacroArgsCache->empty());
MacroArgsMap::iterator I = MacroArgsCache->upper_bound(Offset);
// In case every element in MacroArgsCache is greater than Offset we can't
// decrement the iterator.
if (I == MacroArgsCache->begin())
return Loc;
--I;
unsigned MacroArgBeginOffs = I->first;