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* Implement JIT Arm64 backend * PPTC version bump * Address some feedback from Arm64 JIT PR * Address even more PR feedback * Remove unused IsPageAligned function * Sync Qc flag before calls * Fix comment and remove unused enum * Address riperiperi PR feedback * Delete Breakpoint IR instruction that was only implemented for Arm64
59 lines
1.7 KiB
C#
59 lines
1.7 KiB
C#
using System;
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namespace ARMeilleure.Memory
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{
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class ReservedRegion
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{
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public const int DefaultGranularity = 65536; // Mapping granularity in Windows.
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public IJitMemoryBlock Block { get; }
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public IntPtr Pointer => Block.Pointer;
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private readonly ulong _maxSize;
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private readonly ulong _sizeGranularity;
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private ulong _currentSize;
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public ReservedRegion(IJitMemoryAllocator allocator, ulong maxSize, ulong granularity = 0)
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{
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if (granularity == 0)
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{
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granularity = DefaultGranularity;
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}
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Block = allocator.Reserve(maxSize);
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_maxSize = maxSize;
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_sizeGranularity = granularity;
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_currentSize = 0;
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}
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public void ExpandIfNeeded(ulong desiredSize)
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{
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if (desiredSize > _maxSize)
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{
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throw new OutOfMemoryException();
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}
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if (desiredSize > _currentSize)
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{
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// Lock, and then check again. We only want to commit once.
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lock (this)
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{
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if (desiredSize >= _currentSize)
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{
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ulong overflowBytes = desiredSize - _currentSize;
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ulong moreToCommit = (((_sizeGranularity - 1) + overflowBytes) / _sizeGranularity) * _sizeGranularity; // Round up.
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Block.Commit(_currentSize, moreToCommit);
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_currentSize += moreToCommit;
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}
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}
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}
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}
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public void Dispose()
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{
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Block.Dispose();
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}
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}
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}
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