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Fix memory error in the implementation of IndexSubset. #27850

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Merged
bgogul merged 1 commit into from
Oct 23, 2019
+5 −1
Merged

Fix memory error in the implementation of IndexSubset. #27850

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4 changes: 4 additions & 0 deletions include/swift/AST/IndexSubset.h
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,10 @@ class IndexSubset : public llvm::FoldingSetNode {
/// The number of bit words in the index subset.
unsigned numBitWords;

static unsigned getNumBytesNeededForCapacity(unsigned capacity) {
return getNumBitWordsNeededForCapacity(capacity) * bitWordSize;
}

BitWord *getBitWordsData() {
return reinterpret_cast<BitWord *>(this + 1);
}
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2 changes: 1 addition & 1 deletion lib/AST/ASTContext.cpp
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Expand Up @@ -4822,7 +4822,7 @@ IndexSubset::get(ASTContext &ctx, const SmallBitVector &indices) {
if (existing)
return existing;
auto sizeToAlloc = sizeof(IndexSubset) +
getNumBitWordsNeededForCapacity(capacity);
getNumBytesNeededForCapacity(capacity);
auto *buf = reinterpret_cast<IndexSubset *>(
ctx.Allocate(sizeToAlloc, alignof(IndexSubset)));
auto *newNode = new (buf) IndexSubset(indices);
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