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Smarter Reset(). Instead of deallocating all memory regions and reallocate the

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first region, just deallocate all but the last region in the list.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41782 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-09-08 00:02:17 +00:00
parent ef61ed3507
commit 7dfda9e674
1 changed files with 17 additions and 5 deletions
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22
lib/Support/Allocator.cpp
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@ -68,14 +68,25 @@ public:
return NewRegion->Allocate(AllocSize, Alignment, RegPtr);
}
/// Deallocate - Release all memory for this region to the system.
///
/// Deallocate - Recursively release all memory for this and its next regions
/// to the system.
void Deallocate() {
MemRegion *next = Next;
free(this);
if (next)
next->Deallocate();
}
/// DeallocateAllButLast - Recursively release all memory for this and its
/// next regions to the system stopping at the last region in the list.
/// Returns the pointer to the last region.
MemRegion *DeallocateAllButLast() {
MemRegion *next = Next;
if (!next)
return this;
free(this);
return next->DeallocateAllButLast();
}
};
}
@ -93,9 +104,10 @@ BumpPtrAllocator::~BumpPtrAllocator() {
}
void BumpPtrAllocator::Reset() {
((MemRegion*)TheMemory)->Deallocate();
TheMemory = malloc(4096);
((MemRegion*)TheMemory)->Init(4096, 1, 0);
MemRegion *MRP = (MemRegion*)TheMemory;
MRP = MRP->DeallocateAllButLast();
MRP->Init(4096, 1, 0);
TheMemory = MRP;
}
void *BumpPtrAllocator::Allocate(unsigned Size, unsigned Align) {