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124 lines
3.3 KiB
C++
124 lines
3.3 KiB
C++
// Copyright 2014 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <utility>
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#include "common/assert.h"
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#include "common/logging/log.h"
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#include "core/core.h"
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#include "core/hle/kernel/errors.h"
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#include "core/hle/kernel/handle_table.h"
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#include "core/hle/kernel/process.h"
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#include "core/hle/kernel/thread.h"
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namespace Kernel {
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namespace {
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constexpr u16 GetSlot(Handle handle) {
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return static_cast<u16>(handle >> 15);
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}
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constexpr u16 GetGeneration(Handle handle) {
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return static_cast<u16>(handle & 0x7FFF);
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}
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} // Anonymous namespace
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HandleTable::HandleTable() {
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Clear();
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}
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HandleTable::~HandleTable() = default;
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ResultCode HandleTable::SetSize(s32 handle_table_size) {
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if (static_cast<u32>(handle_table_size) > MAX_COUNT) {
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return ERR_OUT_OF_MEMORY;
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}
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// Values less than or equal to zero indicate to use the maximum allowable
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// size for the handle table in the actual kernel, so we ignore the given
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// value in that case, since we assume this by default unless this function
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// is called.
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if (handle_table_size > 0) {
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table_size = static_cast<u16>(handle_table_size);
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}
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return RESULT_SUCCESS;
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}
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ResultVal<Handle> HandleTable::Create(SharedPtr<Object> obj) {
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DEBUG_ASSERT(obj != nullptr);
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const u16 slot = next_free_slot;
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if (slot >= table_size) {
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LOG_ERROR(Kernel, "Unable to allocate Handle, too many slots in use.");
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return ERR_HANDLE_TABLE_FULL;
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}
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next_free_slot = generations[slot];
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const u16 generation = next_generation++;
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// Overflow count so it fits in the 15 bits dedicated to the generation in the handle.
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// Horizon OS uses zero to represent an invalid handle, so skip to 1.
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if (next_generation >= (1 << 15)) {
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next_generation = 1;
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}
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generations[slot] = generation;
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objects[slot] = std::move(obj);
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Handle handle = generation | (slot << 15);
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return MakeResult<Handle>(handle);
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}
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ResultVal<Handle> HandleTable::Duplicate(Handle handle) {
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SharedPtr<Object> object = GetGeneric(handle);
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if (object == nullptr) {
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LOG_ERROR(Kernel, "Tried to duplicate invalid handle: {:08X}", handle);
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return ERR_INVALID_HANDLE;
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}
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return Create(std::move(object));
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}
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ResultCode HandleTable::Close(Handle handle) {
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if (!IsValid(handle)) {
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return ERR_INVALID_HANDLE;
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}
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const u16 slot = GetSlot(handle);
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objects[slot] = nullptr;
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generations[slot] = next_free_slot;
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next_free_slot = slot;
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return RESULT_SUCCESS;
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}
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bool HandleTable::IsValid(Handle handle) const {
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const std::size_t slot = GetSlot(handle);
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const u16 generation = GetGeneration(handle);
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return slot < table_size && objects[slot] != nullptr && generations[slot] == generation;
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}
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SharedPtr<Object> HandleTable::GetGeneric(Handle handle) const {
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if (handle == CurrentThread) {
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return GetCurrentThread();
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} else if (handle == CurrentProcess) {
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return Core::CurrentProcess();
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}
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if (!IsValid(handle)) {
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return nullptr;
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}
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return objects[GetSlot(handle)];
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}
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void HandleTable::Clear() {
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for (u16 i = 0; i < table_size; ++i) {
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generations[i] = i + 1;
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objects[i] = nullptr;
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}
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next_free_slot = 0;
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}
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} // namespace Kernel
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