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