//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Chris Lattner and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
using namespace llvm;
-bool SmallPtrSetImpl::insert(void *Ptr) {
+void SmallPtrSetImpl::shrink_and_clear() {
+ assert(!isSmall() && "Can't shrink a small set!");
+ free(CurArray);
+
+ // Reduce the number of buckets.
+ CurArraySize = NumElements > 16 ? 1 << (Log2_32_Ceil(NumElements) + 1) : 32;
+ NumElements = NumTombstones = 0;
+
+ // Install the new array. Clear all the buckets to empty.
+ CurArray = (const void**)malloc(sizeof(void*) * (CurArraySize+1));
+ assert(CurArray && "Failed to allocate memory?");
+ memset(CurArray, -1, CurArraySize*sizeof(void*));
+
+ // The end pointer, always valid, is set to a valid element to help the
+ // iterator.
+ CurArray[CurArraySize] = 0;
+}
+
+bool SmallPtrSetImpl::insert_imp(const void * Ptr) {
if (isSmall()) {
// Check to see if it is already in the set.
- for (void **APtr = SmallArray, **E = SmallArray+NumElements;
+ for (const void **APtr = SmallArray, **E = SmallArray+NumElements;
APtr != E; ++APtr)
if (*APtr == Ptr)
return false;
// Otherwise, hit the big set case, which will call grow.
}
- // If more than 3/4 of the array is full, grow.
- if (NumElements*4 >= CurArraySize*3 ||
- CurArraySize-(NumElements+NumTombstones) < CurArraySize/8)
- Grow();
+ if (NumElements*4 >= CurArraySize*3) {
+ // If more than 3/4 of the array is full, grow.
+ Grow(CurArraySize < 64 ? 128 : CurArraySize*2);
+ } else if (CurArraySize-(NumElements+NumTombstones) < CurArraySize/8) {
+ // If fewer of 1/8 of the array is empty (meaning that many are filled with
+ // tombstones), rehash.
+ Grow(CurArraySize);
+ }
// Okay, we know we have space. Find a hash bucket.
- void **Bucket = const_cast<void**>(FindBucketFor(Ptr));
+ const void **Bucket = const_cast<const void**>(FindBucketFor(Ptr));
if (*Bucket == Ptr) return false; // Already inserted, good.
// Otherwise, insert it!
return true;
}
-bool SmallPtrSetImpl::erase(void *Ptr) {
+bool SmallPtrSetImpl::erase_imp(const void * Ptr) {
if (isSmall()) {
// Check to see if it is in the set.
- for (void **APtr = SmallArray, **E = SmallArray+NumElements;
+ for (const void **APtr = SmallArray, **E = SmallArray+NumElements;
APtr != E; ++APtr)
if (*APtr == Ptr) {
// If it is in the set, replace this element.
return true;
}
-void * const *SmallPtrSetImpl::FindBucketFor(void *Ptr) const {
+const void * const *SmallPtrSetImpl::FindBucketFor(const void *Ptr) const {
unsigned Bucket = Hash(Ptr);
unsigned ArraySize = CurArraySize;
unsigned ProbeAmt = 1;
- void *const *Array = CurArray;
- void *const *Tombstone = 0;
+ const void *const *Array = CurArray;
+ const void *const *Tombstone = 0;
while (1) {
// Found Ptr's bucket?
if (Array[Bucket] == Ptr)
/// Grow - Allocate a larger backing store for the buckets and move it over.
///
-void SmallPtrSetImpl::Grow() {
+void SmallPtrSetImpl::Grow(unsigned NewSize) {
// Allocate at twice as many buckets, but at least 128.
unsigned OldSize = CurArraySize;
- unsigned NewSize = OldSize < 64 ? 128 : OldSize*2;
- void **OldBuckets = CurArray;
+ const void **OldBuckets = CurArray;
bool WasSmall = isSmall();
// Install the new array. Clear all the buckets to empty.
- CurArray = (void**)malloc(sizeof(void*) * (NewSize+1));
+ CurArray = (const void**)malloc(sizeof(void*) * (NewSize+1));
assert(CurArray && "Failed to allocate memory?");
CurArraySize = NewSize;
memset(CurArray, -1, NewSize*sizeof(void*));
// Copy over all the elements.
if (WasSmall) {
// Small sets store their elements in order.
- for (void **BucketPtr = OldBuckets, **E = OldBuckets+NumElements;
+ for (const void **BucketPtr = OldBuckets, **E = OldBuckets+NumElements;
BucketPtr != E; ++BucketPtr) {
- void *Elt = *BucketPtr;
- *const_cast<void**>(FindBucketFor(Elt)) = Elt;
+ const void *Elt = *BucketPtr;
+ *const_cast<void**>(FindBucketFor(Elt)) = const_cast<void*>(Elt);
}
} else {
// Copy over all valid entries.
- for (void **BucketPtr = OldBuckets, **E = OldBuckets+OldSize;
+ for (const void **BucketPtr = OldBuckets, **E = OldBuckets+OldSize;
BucketPtr != E; ++BucketPtr) {
// Copy over the element if it is valid.
- void *Elt = *BucketPtr;
+ const void *Elt = *BucketPtr;
if (Elt != getTombstoneMarker() && Elt != getEmptyMarker())
- *const_cast<void**>(FindBucketFor(Elt)) = Elt;
+ *const_cast<void**>(FindBucketFor(Elt)) = const_cast<void*>(Elt);
}
free(OldBuckets);
}
}
-SmallPtrSetImpl::SmallPtrSetImpl(const SmallPtrSetImpl& that) {
- NumElements = that.NumElements;
- NumTombstones = 0;
+SmallPtrSetImpl::SmallPtrSetImpl(const void **SmallStorage,
+ const SmallPtrSetImpl& that) {
+ SmallArray = SmallStorage;
+
+ // If we're becoming small, prepare to insert into our stack space
if (that.isSmall()) {
- CurArraySize = that.CurArraySize;
- CurArray = &SmallArray[0];
- // Copy the entire contents of the array, including the -1's and the null
- // terminator.
- memcpy(CurArray, that.CurArray, sizeof(void*)*(CurArraySize+1));
+ CurArray = SmallArray;
+ // Otherwise, allocate new heap space (unless we were the same size)
} else {
- CurArraySize = that.NumElements < 64 ? 128 : that.CurArraySize*2;
- CurArray = (void**)malloc(sizeof(void*) * (CurArraySize+1));
+ CurArray = (const void**)malloc(sizeof(void*) * (that.CurArraySize+1));
assert(CurArray && "Failed to allocate memory?");
- memset(CurArray, -1, CurArraySize*sizeof(void*));
-
- // The end pointer, always valid, is set to a valid element to help the
- // iterator.
- CurArray[CurArraySize] = 0;
-
- // Copy over all valid entries.
- for (void **BucketPtr = that.CurArray, **E = that.CurArray+that.CurArraySize;
- BucketPtr != E; ++BucketPtr) {
- // Copy over the element if it is valid.
- void *Elt = *BucketPtr;
- if (Elt != getTombstoneMarker() && Elt != getEmptyMarker())
- *const_cast<void**>(FindBucketFor(Elt)) = Elt;
- }
}
+
+ // Copy over the new array size
+ CurArraySize = that.CurArraySize;
+
+ // Copy over the contents from the other set
+ memcpy(CurArray, that.CurArray, sizeof(void*)*(CurArraySize+1));
+
+ NumElements = that.NumElements;
+ NumTombstones = that.NumTombstones;
}
/// CopyFrom - implement operator= from a smallptrset that has the same pointer
"Cannot assign sets with different small sizes");
// If we're becoming small, prepare to insert into our stack space
- if (RHS.isSmall())
- CurArray = &SmallArray[0];
+ if (RHS.isSmall()) {
+ if (!isSmall())
+ free(CurArray);
+ CurArray = SmallArray;
// Otherwise, allocate new heap space (unless we were the same size)
- else if (CurArraySize != RHS.CurArraySize) {
+ } else if (CurArraySize != RHS.CurArraySize) {
if (isSmall())
- CurArray = (void**)malloc(sizeof(void*) * (RHS.CurArraySize+1));
+ CurArray = (const void**)malloc(sizeof(void*) * (RHS.CurArraySize+1));
else
- CurArray = (void**)realloc(CurArray, sizeof(void*)*(RHS.CurArraySize+1));
+ CurArray = (const void**)realloc(CurArray, sizeof(void*)*(RHS.CurArraySize+1));
assert(CurArray && "Failed to allocate memory?");
}