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Split StringMapEntry construction out of StringMap, into StringMapEntry.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34170 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-02-11 00:10:26 +00:00
parent b508987e84
commit 9cc2d3dce8
1 changed files with 55 additions and 28 deletions
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83
include/llvm/ADT/StringMap.h
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@ -94,6 +94,58 @@ public:
/// value. The string data is always stored immediately after the
/// StringMapEntry object.
const char *getKeyData() const {return reinterpret_cast<const char*>(this+1);}
/// Create - Create a StringMapEntry for the specified key and default
/// construct the value.
template<typename AllocatorTy>
static StringMapEntry *Create(const char *KeyStart, const char *KeyEnd,
AllocatorTy &Allocator) {
unsigned KeyLength = KeyEnd-KeyStart;
// Okay, the item doesn't already exist, and 'Bucket' is the bucket to fill
// in. Allocate a new item with space for the string at the end and a null
// terminator.
unsigned AllocSize = sizeof(StringMapEntry)+KeyLength+1;
#ifdef __GNUC__
unsigned Alignment = __alignof__(StringMapEntry);
#else
// FIXME: ugly.
unsigned Alignment = 8;
#endif
StringMapEntry *NewItem =
static_cast<StringMapEntry*>(Allocator.Allocate(AllocSize, Alignment));
// Default construct the value.
new (NewItem) StringMapEntry(KeyLength);
// Copy the string information.
char *StrBuffer = const_cast<char*>(NewItem->getKeyData());
memcpy(StrBuffer, KeyStart, KeyLength);
StrBuffer[KeyLength] = 0; // Null terminate for convenience of clients.
return NewItem;
}
/// Create - Create a StringMapEntry with normal malloc/free.
static StringMapEntry *Create(const char *KeyStart, const char *KeyEnd) {
MallocAllocator A;
return Create(KeyStart, KeyEnd, A);
}
/// Destroy - Destroy this StringMapEntry, releasing memory back to the
/// specified allocator.
template<typename AllocatorTy>
void Destroy(AllocatorTy &Allocator) {
// Free memory referenced by the item.
this->~StringMapEntry();
Allocator.Deallocate(this);
}
/// Destroy this object, releasing memory back to the malloc allocator.
void Destroy() {
MallocAllocator A;
Destroy(A);
}
};
@ -129,31 +181,9 @@ public:
if (Bucket.Item)
return *static_cast<MapEntryTy*>(Bucket.Item);
unsigned KeyLength = KeyEnd-KeyStart;
// Okay, the item doesn't already exist, and 'Bucket' is the bucket to fill
// in. Allocate a new item with space for the string at the end and a null
// terminator.
unsigned AllocSize = sizeof(MapEntryTy)+KeyLength+1;
#ifdef __GNUC__
unsigned Alignment = __alignof__(MapEntryTy);
#else
// FIXME: ugly.
unsigned Alignment = 8;
#endif
MapEntryTy *NewItem =
static_cast<MapEntryTy*>(Allocator.Allocate(AllocSize, Alignment));
// Default construct the value.
new (NewItem) MapEntryTy(KeyLength);
MapEntryTy *NewItem = MapEntryTy::Create(KeyStart, KeyEnd, Allocator);
++NumItems;
// Copy the string information.
char *StrBuffer = const_cast<char*>(NewItem->getKeyData());
memcpy(StrBuffer, KeyStart, KeyLength);
StrBuffer[KeyLength] = 0; // Null terminate for convenience of clients.
// Fill in the bucket for the hash table. The FullHashValue was already
// filled in by LookupBucketFor.
Bucket.Item = NewItem;
@ -166,11 +196,8 @@ public:
~StringMap() {
for (ItemBucket *I = TheTable, *E = TheTable+NumBuckets; I != E; ++I) {
if (MapEntryTy *Id = static_cast<MapEntryTy*>(I->Item)) {
// Free memory referenced by the item.
Id->~MapEntryTy();
Allocator.Deallocate(Id);
}
if (MapEntryTy *Id = static_cast<MapEntryTy*>(I->Item))
Id->Destroy(Allocator);
}
delete [] TheTable;
}