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implement SmallPtrSet::erase

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33581 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2007-01-27 07:59:10 +00:00
parent af3056c97e
commit 0b930852cf
2 changed files with 37 additions and 3 deletions
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27
lib/Support/SmallPtrSet.cpp
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@@ -45,6 +45,33 @@ bool SmallPtrSetImpl::insert(void *Ptr) {
return true;
}
bool SmallPtrSetImpl::erase(void *Ptr) {
if (isSmall()) {
// Check to see if it is in the set.
for (void **APtr = SmallArray, **E = SmallArray+NumElements;
APtr != E; ++APtr)
if (*APtr == Ptr) {
// If it is in the set, move everything over, replacing this element.
memmove(APtr, APtr+1, sizeof(void*)*(E-APtr-1));
// Clear the end element.
E[-1] = getEmptyMarker();
--NumElements;
return false;
}
return false;
}
// Okay, we know we have space. Find a hash bucket.
void **Bucket = const_cast<void**>(FindBucketFor(Ptr));
if (*Bucket != Ptr) return false; // Not in the set?
// Set this as a tombstone.
*Bucket = getTombstoneMarker();
--NumElements;
return true;
}
void * const *SmallPtrSetImpl::FindBucketFor(void *Ptr) const {
unsigned Bucket = Hash(Ptr);
unsigned ArraySize = CurArraySize;