mirror of
https://github.com/hrydgard/ppsspp.git
synced 2024-11-24 05:49:58 +00:00
335 lines
7.3 KiB
C++
335 lines
7.3 KiB
C++
#include "Log.h"
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#include "BlockAllocator.h"
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#include "ChunkFile.h"
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// Slow freaking thing but works (eventually) :)
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BlockAllocator::BlockAllocator(int grain) : grain_(grain)
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{
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blocks.clear();
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}
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BlockAllocator::~BlockAllocator()
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{
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Shutdown();
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}
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void BlockAllocator::Init(u32 rangeStart, u32 rangeSize)
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{
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Shutdown();
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rangeStart_ = rangeStart;
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rangeSize_ = rangeSize;
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//Initial block, covering everything
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blocks.push_back(Block(rangeStart_, rangeSize_, false));
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}
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void BlockAllocator::Shutdown()
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{
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blocks.clear();
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}
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u32 BlockAllocator::AllocAligned(u32 &size, u32 grain, bool fromTop, const char *tag)
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{
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// Sanity check
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if (size == 0 || size > rangeSize_) {
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ERROR_LOG(HLE, "Clearly bogus size: %08x - failing allocation", size);
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return -1;
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}
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// It could be off step, but the grain should generally be a power of 2.
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if (grain < grain_)
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grain = grain_;
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// upalign size to grain
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size = (size + grain - 1) & ~(grain - 1);
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if (!fromTop)
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{
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//Allocate from bottom of mem
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for (std::list<Block>::iterator iter = blocks.begin(); iter != blocks.end(); iter++)
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{
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BlockAllocator::Block &b = *iter;
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u32 offset = b.start % grain;
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u32 needed = offset + size;
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if (b.taken == false && b.size >= needed)
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{
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if (b.size == needed)
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{
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b.taken = true;
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b.SetTag(tag);
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return b.start + offset;
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}
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else
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{
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blocks.insert(++iter, Block(b.start + needed, b.size - needed, false));
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b.taken = true;
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b.size = needed;
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b.SetTag(tag);
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return b.start + offset;
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}
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}
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}
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}
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else
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{
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// Allocate from top of mem.
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for (std::list<Block>::reverse_iterator iter = blocks.rbegin(); iter != blocks.rend(); ++iter)
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{
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std::list<Block>::reverse_iterator hey = iter;
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BlockAllocator::Block &b = *((++hey).base()); //yes, confusing syntax. reverse_iterators are confusing
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u32 offset = b.start % grain;
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u32 needed = offset + size;
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if (b.taken == false && b.size >= needed)
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{
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if (b.size == needed)
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{
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b.taken = true;
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b.SetTag(tag);
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return b.start + offset;
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}
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else
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{
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blocks.insert(hey.base(), Block(b.start, b.size - needed, false));
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b.taken = true;
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b.start += b.size - needed;
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b.size = needed;
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b.SetTag(tag);
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return b.start + offset;
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}
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}
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}
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}
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//Out of memory :(
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ListBlocks();
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ERROR_LOG(HLE, "Block Allocator failed to allocate %i (%08x) bytes of contiguous memory", size, size);
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return -1;
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}
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u32 BlockAllocator::Alloc(u32 &size, bool fromTop, const char *tag)
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{
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// We want to make sure it's aligned in case AllocAt() was used.
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return AllocAligned(size, grain_, fromTop, tag);
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}
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u32 BlockAllocator::AllocAt(u32 position, u32 size, const char *tag)
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{
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CheckBlocks();
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if (size > rangeSize_) {
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ERROR_LOG(HLE, "Clearly bogus size: %08x - failing allocation", size);
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return -1;
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}
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// upalign size to grain
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size = (size + grain_ - 1) & ~(grain_ - 1);
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// check that position is aligned
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if (position & (grain_ - 1)) {
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ERROR_LOG(HLE, "Position %08x does not align to grain. Grain will be off.", position);
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}
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std::list<Block>::iterator iter = GetBlockIterFromAddress(position);
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if (iter != blocks.end())
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{
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Block &b = *iter;
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if (b.taken)
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{
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ERROR_LOG(HLE, "Block allocator AllocAt failed, block taken! %08x, %i", position, size);
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return -1;
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}
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else
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{
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//good to go
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if (b.start == position)
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{
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blocks.insert(++iter, Block(b.start + size, b.size - size, false));
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b.taken = true;
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b.size = size;
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b.SetTag(tag);
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CheckBlocks();
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return position;
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}
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else
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{
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int size1 = position - b.start;
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blocks.insert(iter, Block(b.start, size1, false));
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if (b.start + b.size > position + size)
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{
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iter++;
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blocks.insert(iter, Block(position + size, b.size - (size + size1), false));
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}
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b.taken = true;
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b.start = position;
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b.size = size;
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b.SetTag(tag);
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return position;
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}
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}
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}
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else
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{
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ERROR_LOG(HLE, "Block allocator AllocAt failed :( %08x, %i", position, size);
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}
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//Out of memory :(
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ListBlocks();
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ERROR_LOG(HLE, "Block Allocator failed to allocate %i bytes of contiguous memory", size);
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return -1;
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}
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void BlockAllocator::MergeFreeBlocks()
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{
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restart:
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DEBUG_LOG(HLE, "Merging Blocks");
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std::list<Block>::iterator iter1, iter2;
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iter1 = blocks.begin();
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iter2 = blocks.begin();
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iter2++;
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while (iter2 != blocks.end())
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{
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BlockAllocator::Block &b1 = *iter1;
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BlockAllocator::Block &b2 = *iter2;
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if (b1.taken == false && b2.taken == false)
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{
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DEBUG_LOG(HLE, "Block Alloc found adjacent free blocks - merging");
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b1.size += b2.size;
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blocks.erase(iter2);
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CheckBlocks();
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goto restart; //iterators now invalid - we have to restart our search
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}
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iter1++;
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iter2++;
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}
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}
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bool BlockAllocator::Free(u32 position)
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{
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BlockAllocator::Block *b = GetBlockFromAddress(position);
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if (b && b->taken)
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{
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b->taken = false;
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MergeFreeBlocks();
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return true;
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}
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else
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{
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ERROR_LOG(HLE, "BlockAllocator : invalid free %08x", position);
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return false;
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}
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}
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bool BlockAllocator::FreeExact(u32 position)
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{
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BlockAllocator::Block *b = GetBlockFromAddress(position);
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if (b && b->taken && b->start == position)
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return Free(position);
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else
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{
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ERROR_LOG(HLE, "BlockAllocator : invalid free %08x", position);
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return false;
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}
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}
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void BlockAllocator::CheckBlocks()
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{
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for (std::list<Block>::iterator iter = blocks.begin(); iter != blocks.end(); iter++)
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{
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BlockAllocator::Block &b = *iter;
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if (b.start > 0xc0000000) { // probably free'd debug values
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ERROR_LOG(HLE, "Bogus block in allocator");
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}
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}
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}
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std::list<BlockAllocator::Block>::iterator BlockAllocator::GetBlockIterFromAddress(u32 addr)
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{
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for (std::list<Block>::iterator iter = blocks.begin(); iter != blocks.end(); iter++)
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{
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BlockAllocator::Block &b = *iter;
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if (b.start <= addr && b.start+b.size > addr)
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{
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// Got one!
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return iter;
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}
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}
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return blocks.end();
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}
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BlockAllocator::Block *BlockAllocator::GetBlockFromAddress(u32 addr)
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{
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std::list<Block>::iterator iter = GetBlockIterFromAddress(addr);
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if (iter == blocks.end())
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return 0;
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else
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return &(*iter);
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}
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u32 BlockAllocator::GetBlockStartFromAddress(u32 addr)
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{
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Block *b = GetBlockFromAddress(addr);
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if (b)
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return b->start;
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else
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return -1;
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}
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u32 BlockAllocator::GetBlockSizeFromAddress(u32 addr)
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{
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Block *b = GetBlockFromAddress(addr);
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if (b)
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return b->size;
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else
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return -1;
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}
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void BlockAllocator::ListBlocks()
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{
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INFO_LOG(HLE,"-----------");
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for (std::list<Block>::const_iterator iter = blocks.begin(); iter != blocks.end(); iter++)
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{
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const Block &b = *iter;
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INFO_LOG(HLE, "Block: %08x - %08x size %08x taken=%i tag=%s", b.start, b.start+b.size, b.size, b.taken ? 1:0, b.tag);
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}
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}
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u32 BlockAllocator::GetLargestFreeBlockSize()
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{
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u32 maxFreeBlock = 0;
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for (std::list<Block>::const_iterator iter = blocks.begin(); iter != blocks.end(); iter++)
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{
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const Block &b = *iter;
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if (!b.taken)
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{
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if (b.size > maxFreeBlock)
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maxFreeBlock = b.size;
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}
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}
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return maxFreeBlock;
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}
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u32 BlockAllocator::GetTotalFreeBytes()
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{
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u32 sum = 0;
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for (std::list<Block>::const_iterator iter = blocks.begin(); iter != blocks.end(); iter++)
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{
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const Block &b = *iter;
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if (!b.taken)
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{
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sum += b.size;
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}
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}
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return sum;
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}
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void BlockAllocator::DoState(PointerWrap &p)
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{
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Block b(0, 0, false);
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p.Do(blocks, b);
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p.Do(rangeStart_);
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p.Do(rangeSize_);
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p.Do(grain_);
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p.DoMarker("BlockAllocator");
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}
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