6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-08-09 11:25:55 +00:00
Code Issues Projects Releases Wiki Activity

Let BumpPtrAllocator lazily allocate the first slab.

Browse Source 
We have some code in llvm and clang where a BumpPtrAllocator is declared in a
class but never used in the common case. Stop wasting memory there.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101130 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2010-04-13 14:41:51 +00:00
parent d5e624027a
commit 5e6a705985
1 changed files with 6 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
lib/Support/Allocator.cpp
View File

@@ -23,9 +23,7 @@ namespace llvm {
BumpPtrAllocator::BumpPtrAllocator(size_t size, size_t threshold, BumpPtrAllocator::BumpPtrAllocator(size_t size, size_t threshold,
SlabAllocator &allocator) SlabAllocator &allocator)
: SlabSize(size), SizeThreshold(threshold), Allocator(allocator), : SlabSize(size), SizeThreshold(threshold), Allocator(allocator),
CurSlab(0), BytesAllocated(0) { CurSlab(0), BytesAllocated(0) { }
StartNewSlab();
}
BumpPtrAllocator::~BumpPtrAllocator() { BumpPtrAllocator::~BumpPtrAllocator() {
DeallocateSlabs(CurSlab); DeallocateSlabs(CurSlab);
@@ -72,6 +70,8 @@ void BumpPtrAllocator::DeallocateSlabs(MemSlab *Slab) {
/// Reset - Deallocate all but the current slab and reset the current pointer /// Reset - Deallocate all but the current slab and reset the current pointer
/// to the beginning of it, freeing all memory allocated so far. /// to the beginning of it, freeing all memory allocated so far.
void BumpPtrAllocator::Reset() { void BumpPtrAllocator::Reset() {
if (!CurSlab) // Start a new slab if we didn't allocate one already.
StartNewSlab();
DeallocateSlabs(CurSlab->NextPtr); DeallocateSlabs(CurSlab->NextPtr);
CurSlab->NextPtr = 0; CurSlab->NextPtr = 0;
CurPtr = (char*)(CurSlab + 1); CurPtr = (char*)(CurSlab + 1);
@@ -81,6 +81,9 @@ void BumpPtrAllocator::Reset() {
/// Allocate - Allocate space at the specified alignment. /// Allocate - Allocate space at the specified alignment.
/// ///
void *BumpPtrAllocator::Allocate(size_t Size, size_t Alignment) { void *BumpPtrAllocator::Allocate(size_t Size, size_t Alignment) {
if (!CurSlab) // Start a new slab if we haven't allocated one already.
StartNewSlab();
// Keep track of how many bytes we've allocated. // Keep track of how many bytes we've allocated.
BytesAllocated += Size; BytesAllocated += Size;