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Merge pull request #2284 from lioncash/heap-alloc

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kernel/vm_manager: Unify heap allocation/freeing functions
This commit is contained in:
bunnei 2019-03-28 17:56:49 -04:00 committed by GitHub
commit 16dc3a1dd5
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3 changed files with 82 additions and 60 deletions
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9
src/core/hle/kernel/svc.cpp
View File

@ -175,11 +175,8 @@ static ResultCode SetHeapSize(VAddr* heap_addr, u64 heap_size) {
return ERR_INVALID_SIZE;
}
auto& vm_manager = Core::CurrentProcess()->VMManager();
const VAddr heap_base = vm_manager.GetHeapRegionBaseAddress();
const auto alloc_result =
vm_manager.HeapAllocate(heap_base, heap_size, VMAPermission::ReadWrite);
auto& vm_manager = Core::System::GetInstance().Kernel().CurrentProcess()->VMManager();
const auto alloc_result = vm_manager.SetHeapSize(heap_size);
if (alloc_result.Failed()) {
return alloc_result.Code();
}
@ -809,7 +806,7 @@ static ResultCode GetInfo(u64* result, u64 info_id, u64 handle, u64 info_sub_id)
return RESULT_SUCCESS;
case GetInfoType::TotalHeapUsage:
*result = process->VMManager().GetTotalHeapUsage();
*result = process->VMManager().GetCurrentHeapSize();
return RESULT_SUCCESS;
case GetInfoType::IsVirtualAddressMemoryEnabled:

78
src/core/hle/kernel/vm_manager.cpp
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@ -256,57 +256,50 @@ ResultCode VMManager::ReprotectRange(VAddr target, u64 size, VMAPermission new_p
return RESULT_SUCCESS;
}
ResultVal<VAddr> VMManager::HeapAllocate(VAddr target, u64 size, VMAPermission perms) {
if (!IsWithinHeapRegion(target, size)) {
return ERR_INVALID_ADDRESS;
ResultVal<VAddr> VMManager::SetHeapSize(u64 size) {
if (size > GetHeapRegionSize()) {
return ERR_OUT_OF_MEMORY;
}
// No need to do any additional work if the heap is already the given size.
if (size == GetCurrentHeapSize()) {
return MakeResult(heap_region_base);
}
if (heap_memory == nullptr) {
// Initialize heap
heap_memory = std::make_shared<std::vector<u8>>();
heap_start = heap_end = target;
heap_memory = std::make_shared<std::vector<u8>>(size);
heap_end = heap_region_base + size;
} else {
UnmapRange(heap_start, heap_end - heap_start);
UnmapRange(heap_region_base, GetCurrentHeapSize());
}
// If necessary, expand backing vector to cover new heap extents.
if (target < heap_start) {
heap_memory->insert(begin(*heap_memory), heap_start - target, 0);
heap_start = target;
// 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());
}
if (target + size > heap_end) {
heap_memory->insert(end(*heap_memory), (target + size) - heap_end, 0);
heap_end = target + size;
RefreshMemoryBlockMappings(heap_memory.get());
}
ASSERT(heap_end - heap_start == heap_memory->size());
CASCADE_RESULT(auto vma, MapMemoryBlock(target, heap_memory, target - heap_start, size,
MemoryState::Heap));
Reprotect(vma, perms);
heap_end = heap_region_base + size;
ASSERT(GetCurrentHeapSize() == heap_memory->size());
heap_used = size;
return MakeResult<VAddr>(heap_end - size);
}
ResultCode VMManager::HeapFree(VAddr target, u64 size) {
if (!IsWithinHeapRegion(target, size)) {
return ERR_INVALID_ADDRESS;
const auto mapping_result =
MapMemoryBlock(heap_region_base, heap_memory, 0, size, MemoryState::Heap);
if (mapping_result.Failed()) {
return mapping_result.Code();
}
if (size == 0) {
return RESULT_SUCCESS;
}
const ResultCode result = UnmapRange(target, size);
if (result.IsError()) {
return result;
}
heap_used -= size;
return RESULT_SUCCESS;
return MakeResult<VAddr>(heap_region_base);
}
MemoryInfo VMManager::QueryMemory(VAddr address) const {
@ -598,6 +591,7 @@ void VMManager::InitializeMemoryRegionRanges(FileSys::ProgramAddressSpaceType ty
heap_region_base = map_region_end;
heap_region_end = heap_region_base + heap_region_size;
heap_end = heap_region_base;
new_map_region_base = heap_region_end;
new_map_region_end = new_map_region_base + new_map_region_size;
@ -692,10 +686,6 @@ u64 VMManager::GetTotalMemoryUsage() const {
return 0xF8000000;
}
u64 VMManager::GetTotalHeapUsage() const {
return heap_used;
}
VAddr VMManager::GetAddressSpaceBaseAddress() const {
return address_space_base;
}
@ -778,6 +768,10 @@ u64 VMManager::GetHeapRegionSize() const {
return heap_region_end - heap_region_base;
}
u64 VMManager::GetCurrentHeapSize() const {
return heap_end - heap_region_base;
}
bool VMManager::IsWithinHeapRegion(VAddr address, u64 size) const {
return IsInsideAddressRange(address, size, GetHeapRegionBaseAddress(),
GetHeapRegionEndAddress());

55
src/core/hle/kernel/vm_manager.h
View File

@ -380,11 +380,41 @@ public:
/// Changes the permissions of a range of addresses, splitting VMAs as necessary.
ResultCode ReprotectRange(VAddr target, u64 size, VMAPermission new_perms);
ResultVal<VAddr> HeapAllocate(VAddr target, u64 size, VMAPermission perms);
ResultCode HeapFree(VAddr target, u64 size);
ResultCode MirrorMemory(VAddr dst_addr, VAddr src_addr, u64 size, MemoryState state);
/// Attempts to allocate a heap with the given size.
///
/// @param size The size of the heap to allocate in bytes.
///
/// @note If a heap is currently allocated, and this is called
/// with a size that is equal to the size of the current heap,
/// then this function will do nothing and return the current
/// heap's starting address, as there's no need to perform
/// any additional heap allocation work.
///
/// @note If a heap is currently allocated, and this is called
/// with a size less than the current heap's size, then
/// this function will attempt to shrink the heap.
///
/// @note If a heap is currently allocated, and this is called
/// with a size larger than the current heap's size, then
/// this function will attempt to extend the size of the heap.
///
/// @returns A result indicating either success or failure.
/// <p>
/// If successful, this function will return a result
/// containing the starting address to the allocated heap.
/// <p>
/// If unsuccessful, this function will return a result
/// containing an error code.
///
/// @pre The given size must lie within the allowable heap
/// memory region managed by this VMManager instance.
/// Failure to abide by this will result in ERR_OUT_OF_MEMORY
/// being returned as the result.
///
ResultVal<VAddr> SetHeapSize(u64 size);
/// Queries the memory manager for information about the given address.
///
/// @param address The address to query the memory manager about for information.
@ -418,9 +448,6 @@ public:
/// Gets the total memory usage, used by svcGetInfo
u64 GetTotalMemoryUsage() const;
/// Gets the total heap usage, used by svcGetInfo
u64 GetTotalHeapUsage() const;
/// Gets the address space base address
VAddr GetAddressSpaceBaseAddress() const;
@ -469,6 +496,13 @@ public:
/// Gets the total size of the heap region in bytes.
u64 GetHeapRegionSize() const;
/// Gets the total size of the current heap in bytes.
///
/// @note This is the current allocated heap size, not the size
/// of the region it's allowed to exist within.
///
u64 GetCurrentHeapSize() const;
/// Determines whether or not the specified range is within the heap region.
bool IsWithinHeapRegion(VAddr address, u64 size) const;
@ -617,9 +651,6 @@ private:
VAddr new_map_region_base = 0;
VAddr new_map_region_end = 0;
VAddr main_code_region_base = 0;
VAddr main_code_region_end = 0;
VAddr tls_io_region_base = 0;
VAddr tls_io_region_end = 0;
@ -628,9 +659,9 @@ private:
// This makes deallocation and reallocation of holes fast and keeps process memory contiguous
// in the emulator address space, allowing Memory::GetPointer to be reasonably safe.
std::shared_ptr<std::vector<u8>> heap_memory;
// The left/right bounds of the address space covered by heap_memory.
VAddr heap_start = 0;
// The end of the currently allocated heap. This is not an inclusive
// end of the range. This is essentially 'base_address + current_size'.
VAddr heap_end = 0;
u64 heap_used = 0;
};
} // namespace Kernel