-namespace {
-/// MemRegion - This is one chunk of the BumpPtrAllocator.
-class MemRegion {
- unsigned RegionSize;
- MemRegion *Next;
- char *NextPtr;
-public:
- void Init(unsigned size, unsigned Alignment, MemRegion *next) {
- RegionSize = size;
- Next = next;
- NextPtr = (char*)(this+1);
-
- // Align NextPtr.
- NextPtr = (char*)((intptr_t)(NextPtr+Alignment-1) &
- ~(intptr_t)(Alignment-1));
- }
-
- const MemRegion *getNext() const { return Next; }
- unsigned getNumBytesAllocated() const {
- return NextPtr-(const char*)this;
- }
-
- /// Allocate - Allocate and return at least the specified number of bytes.
- ///
- void *Allocate(unsigned AllocSize, unsigned Alignment, MemRegion **RegPtr) {
- // Round size up to an even multiple of the alignment.
- AllocSize = (AllocSize+Alignment-1) & ~(Alignment-1);
-
- // If there is space in this region, return it.
- if (unsigned(NextPtr+AllocSize-(char*)this) <= RegionSize) {
- void *Result = NextPtr;
- NextPtr += AllocSize;
- return Result;
- }
-
- // Otherwise, we have to allocate a new chunk. Create one twice as big as
- // this one.
- MemRegion *NewRegion = (MemRegion *)malloc(RegionSize*2);
- NewRegion->Init(RegionSize*2, Alignment, this);