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core/hle: Simplify PhysicalMemory usage in vm_manager.

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This commit is contained in:
Markus Wick 2020-01-12 16:55:51 +01:00
parent 7e94e544f4
commit 55103da066
1 changed files with 11 additions and 23 deletions
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34
src/core/hle/kernel/vm_manager.cpp
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@ -3,6 +3,7 @@
// Refer to the license.txt file included.
#include <algorithm>
#include <cstring>
#include <iterator>
#include <utility>
#include "common/alignment.h"
@ -269,18 +270,9 @@ ResultVal<VAddr> VMManager::SetHeapSize(u64 size) {
// If necessary, expand backing vector to cover new heap extents in
// the case of allocating. Otherwise, shrink the backing memory,
// if a smaller heap has been requested.
const u64 old_heap_size = GetCurrentHeapSize();
if (size > old_heap_size) {
const u64 alloc_size = size - old_heap_size;
heap_memory->insert(heap_memory->end(), alloc_size, 0);
RefreshMemoryBlockMappings(heap_memory.get());
} else if (size < old_heap_size) {
heap_memory->resize(size);
heap_memory->shrink_to_fit();
RefreshMemoryBlockMappings(heap_memory.get());
}
heap_memory->resize(size);
heap_memory->shrink_to_fit();
RefreshMemoryBlockMappings(heap_memory.get());
heap_end = heap_region_base + size;
ASSERT(GetCurrentHeapSize() == heap_memory->size());
@ -752,24 +744,20 @@ void VMManager::MergeAdjacentVMA(VirtualMemoryArea& left, const VirtualMemoryAre
// Always merge allocated memory blocks, even when they don't share the same backing block.
if (left.type == VMAType::AllocatedMemoryBlock &&
(left.backing_block != right.backing_block || left.offset + left.size != right.offset)) {
const auto right_begin = right.backing_block->begin() + right.offset;
const auto right_end = right_begin + right.size;
// Check if we can save work.
if (left.offset == 0 && left.size == left.backing_block->size()) {
// Fast case: left is an entire backing block.
left.backing_block->insert(left.backing_block->end(), right_begin, right_end);
left.backing_block->resize(left.size + right.size);
std::memcpy(left.backing_block->data() + left.size,
right.backing_block->data() + right.offset, right.size);
} else {
// Slow case: make a new memory block for left and right.
const auto left_begin = left.backing_block->begin() + left.offset;
const auto left_end = left_begin + left.size;
const auto left_size = static_cast<std::size_t>(std::distance(left_begin, left_end));
const auto right_size = static_cast<std::size_t>(std::distance(right_begin, right_end));
auto new_memory = std::make_shared<PhysicalMemory>();
new_memory->reserve(left_size + right_size);
new_memory->insert(new_memory->end(), left_begin, left_end);
new_memory->insert(new_memory->end(), right_begin, right_end);
new_memory->resize(left.size + right.size);
std::memcpy(new_memory->data(), left.backing_block->data() + left.offset, left.size);
std::memcpy(new_memory->data() + left.size, right.backing_block->data() + right.offset,
right.size);
left.backing_block = std::move(new_memory);
left.offset = 0;