fsp_srv: Remove unnecessary vector construction in IFile's Write() function

We can avoid constructing a std::vector here by simply passing a pointer
to the original data and the size of the copy we wish to perform to the
backend's Write() function instead, avoiding copying the data where it's
otherwise not needed.

src/core/file_sys/content_archive.cpp

@@ -2,9 +2,6 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
-#include <algorithm>
-#include <utility>
-
 #include "common/logging/log.h"
 #include "core/file_sys/content_archive.h"
 #include "core/file_sys/vfs_offset.h"
@@ -64,7 +61,7 @@ struct RomFSSuperblock {
 };
 static_assert(sizeof(RomFSSuperblock) == 0xE8, "RomFSSuperblock has incorrect size.");
 
-NCA::NCA(VirtualFile file_) : file(std::move(file_)) {
+NCA::NCA(VirtualFile file_) : file(file_) {
     if (sizeof(NCAHeader) != file->ReadObject(&header))
         LOG_CRITICAL(Loader, "File reader errored out during header read.");
 

src/core/file_sys/content_archive.h

@@ -4,11 +4,6 @@
 
 #pragma once
 
-#include <array>
-#include <memory>
-#include <string>
-#include <vector>
-
 #include "common/common_funcs.h"
 #include "common/common_types.h"
 #include "common/swap.h"
@@ -53,7 +48,7 @@ struct NCAHeader {
 };
 static_assert(sizeof(NCAHeader) == 0x400, "NCAHeader has incorrect size.");
 
-inline bool IsDirectoryExeFS(const std::shared_ptr<VfsDirectory>& pfs) {
+inline bool IsDirectoryExeFS(std::shared_ptr<FileSys::VfsDirectory> pfs) {
     // According to switchbrew, an exefs must only contain these two files:
     return pfs->GetFile("main") != nullptr && pfs->GetFile("main.npdm") != nullptr;
 }

src/core/hle/kernel/address_arbiter.cpp

@@ -65,7 +65,7 @@ static void WakeThreads(std::vector<SharedPtr<Thread>>& waiting_threads, s32 num
 
     // Signal the waiting threads.
     for (size_t i = 0; i < last; i++) {
-        ASSERT(waiting_threads[i]->status = THREADSTATUS_WAIT_ARB);
+        ASSERT(waiting_threads[i]->status == THREADSTATUS_WAIT_ARB);
         waiting_threads[i]->SetWaitSynchronizationResult(RESULT_SUCCESS);
         waiting_threads[i]->arb_wait_address = 0;
         waiting_threads[i]->ResumeFromWait();

src/core/hle/kernel/hle_ipc.cpp

@@ -2,6 +2,8 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include <utility>
+
 #include <boost/range/algorithm_ext/erase.hpp>
 #include "common/assert.h"
 #include "common/common_funcs.h"
@@ -19,10 +21,10 @@ namespace Kernel {
 
 void SessionRequestHandler::ClientConnected(SharedPtr<ServerSession> server_session) {
     server_session->SetHleHandler(shared_from_this());
-    connected_sessions.push_back(server_session);
+    connected_sessions.push_back(std::move(server_session));
 }
 
-void SessionRequestHandler::ClientDisconnected(SharedPtr<ServerSession> server_session) {
+void SessionRequestHandler::ClientDisconnected(const SharedPtr<ServerSession>& server_session) {
     server_session->SetHleHandler(nullptr);
     boost::range::remove_erase(connected_sessions, server_session);
 }

src/core/hle/kernel/hle_ipc.h

@@ -59,12 +59,12 @@ public:
      * associated ServerSession.
      * @param server_session ServerSession associated with the connection.
      */
-    void ClientDisconnected(SharedPtr<ServerSession> server_session);
+    void ClientDisconnected(const SharedPtr<ServerSession>& server_session);
 
 protected:
     /// List of sessions that are connected to this handler.
     /// A ServerSession whose server endpoint is an HLE implementation is kept alive by this list
-    // for the duration of the connection.
+    /// for the duration of the connection.
     std::vector<SharedPtr<ServerSession>> connected_sessions;
 };
 

src/core/hle/kernel/object_address_table.cpp

@@ -2,6 +2,8 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include <utility>
+
 #include "common/assert.h"
 #include "core/hle/kernel/object_address_table.h"
 
@@ -11,7 +13,7 @@ ObjectAddressTable g_object_address_table;
 
 void ObjectAddressTable::Insert(VAddr addr, SharedPtr<Object> obj) {
     ASSERT_MSG(objects.find(addr) == objects.end(), "Object already exists with addr=0x{:X}", addr);
-    objects[addr] = obj;
+    objects[addr] = std::move(obj);
 }
 
 void ObjectAddressTable::Close(VAddr addr) {

src/core/hle/kernel/scheduler.cpp

@@ -2,6 +2,8 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include <utility>
+
 #include "core/core.h"
 #include "core/core_timing.h"
 #include "core/hle/kernel/process.h"
@@ -113,7 +115,7 @@ void Scheduler::Reschedule() {
 void Scheduler::AddThread(SharedPtr<Thread> thread, u32 priority) {
     std::lock_guard<std::mutex> lock(scheduler_mutex);
 
-    thread_list.push_back(thread);
+    thread_list.push_back(std::move(thread));
     ready_queue.prepare(priority);
 }
 

src/core/hle/kernel/server_session.cpp

@@ -3,6 +3,7 @@
 // Refer to the license.txt file included.
 
 #include <tuple>
+#include <utility>
 
 #include "core/core.h"
 #include "core/hle/ipc_helpers.h"
@@ -158,7 +159,7 @@ ServerSession::SessionPair ServerSession::CreateSessionPair(const std::string& n
     std::shared_ptr<Session> parent(new Session);
     parent->client = client_session.get();
     parent->server = server_session.get();
-    parent->port = port;
+    parent->port = std::move(port);
 
     client_session->parent = parent;
     server_session->parent = parent;

src/core/hle/kernel/shared_memory.cpp

@@ -2,7 +2,7 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
-#include <cstring>
+#include <utility>
 #include "common/logging/log.h"
 #include "core/core.h"
 #include "core/hle/kernel/errors.h"
@@ -21,7 +21,7 @@ SharedPtr<SharedMemory> SharedMemory::Create(SharedPtr<Process> owner_process, u
                                              MemoryRegion region, std::string name) {
     SharedPtr<SharedMemory> shared_memory(new SharedMemory);
 
-    shared_memory->owner_process = owner_process;
+    shared_memory->owner_process = std::move(owner_process);
     shared_memory->name = std::move(name);
     shared_memory->size = size;
     shared_memory->permissions = permissions;
@@ -87,7 +87,7 @@ SharedPtr<SharedMemory> SharedMemory::CreateForApplet(std::shared_ptr<std::vecto
     shared_memory->size = size;
     shared_memory->permissions = permissions;
     shared_memory->other_permissions = other_permissions;
-    shared_memory->backing_block = heap_block;
+    shared_memory->backing_block = std::move(heap_block);
     shared_memory->backing_block_offset = offset;
     shared_memory->base_address = Memory::HEAP_VADDR + offset;
 

src/core/hle/kernel/thread.cpp

@@ -400,7 +400,7 @@ SharedPtr<Thread> SetupMainThread(VAddr entry_point, u32 priority,
 
     // Initialize new "main" thread
     auto thread_res = Thread::Create("main", entry_point, priority, 0, THREADPROCESSORID_0,
-                                     Memory::STACK_AREA_VADDR_END, owner_process);
+                                     Memory::STACK_AREA_VADDR_END, std::move(owner_process));
 
     SharedPtr<Thread> thread = std::move(thread_res).Unwrap();
 

src/core/hle/kernel/vm_manager.cpp

@@ -3,6 +3,7 @@
 // Refer to the license.txt file included.
 
 #include <iterator>
+#include <utility>
 #include "common/assert.h"
 #include "common/logging/log.h"
 #include "core/arm/arm_interface.h"
@@ -107,7 +108,7 @@ ResultVal<VMManager::VMAHandle> VMManager::MapMemoryBlock(VAddr target,
     final_vma.type = VMAType::AllocatedMemoryBlock;
     final_vma.permissions = VMAPermission::ReadWrite;
     final_vma.meminfo_state = state;
-    final_vma.backing_block = block;
+    final_vma.backing_block = std::move(block);
     final_vma.offset = offset;
     UpdatePageTableForVMA(final_vma);
 
@@ -150,7 +151,7 @@ ResultVal<VMManager::VMAHandle> VMManager::MapMMIO(VAddr target, PAddr paddr, u6
     final_vma.permissions = VMAPermission::ReadWrite;
     final_vma.meminfo_state = state;
     final_vma.paddr = paddr;
-    final_vma.mmio_handler = mmio_handler;
+    final_vma.mmio_handler = std::move(mmio_handler);
     UpdatePageTableForVMA(final_vma);
 
     return MakeResult<VMAHandle>(MergeAdjacent(vma_handle));

src/core/hle/service/filesystem/fsp_srv.cpp

@@ -3,6 +3,14 @@
 // Refer to the license.txt file included.
 
 #include <cinttypes>
+#include <cstring>
+#include <iterator>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "common/assert.h"
+#include "common/common_types.h"
 #include "common/logging/log.h"
 #include "common/string_util.h"
 #include "core/core.h"
@@ -26,7 +34,7 @@ enum class StorageId : u8 {
 
 class IStorage final : public ServiceFramework<IStorage> {
 public:
-    IStorage(FileSys::VirtualFile backend_)
+    explicit IStorage(FileSys::VirtualFile backend_)
         : ServiceFramework("IStorage"), backend(std::move(backend_)) {
         static const FunctionInfo functions[] = {
             {0, &IStorage::Read, "Read"}, {1, nullptr, "Write"},   {2, nullptr, "Flush"},
@@ -133,19 +141,19 @@ private:
             return;
         }
 
-        std::vector<u8> data = ctx.ReadBuffer();
-        std::vector<u8> actual_data(length);
+        const std::vector<u8> data = ctx.ReadBuffer();
 
         ASSERT_MSG(
-            data.size() <= length,
+            static_cast<s64>(data.size()) <= length,
             "Attempting to write more data than requested (requested={:016X}, actual={:016X}).",
             length, data.size());
 
-        std::copy(data.begin(), data.end(), actual_data.begin());
         // Write the data to the Storage backend
-        auto written = backend->WriteBytes(data, offset);
+        const auto write_size =
+            static_cast<std::size_t>(std::distance(data.begin(), data.begin() + length));
+        const std::size_t written = backend->Write(data.data(), write_size, offset);
 
-        ASSERT_MSG(written == length,
+        ASSERT_MSG(static_cast<s64>(written) == length,
                    "Could not write all bytes to file (requested={:016X}, actual={:016X}).", length,
                    written);
 
@@ -223,23 +231,20 @@ private:
         LOG_DEBUG(Service_FS, "called, unk=0x{:X}", unk);
 
         // Calculate how many entries we can fit in the output buffer
-        u64 count_entries = ctx.GetWriteBufferSize() / sizeof(FileSys::Entry);
+        const u64 count_entries = ctx.GetWriteBufferSize() / sizeof(FileSys::Entry);
 
         // Cap at total number of entries.
-        u64 actual_entries = std::min(count_entries, entries.size() - next_entry_index);
+        const u64 actual_entries = std::min(count_entries, entries.size() - next_entry_index);
 
-        // Read the data from the Directory backend
-        std::vector<FileSys::Entry> entry_data(entries.begin() + next_entry_index,
-                                               entries.begin() + next_entry_index + actual_entries);
+        // Determine data start and end
+        const auto* begin = reinterpret_cast<u8*>(entries.data() + next_entry_index);
+        const auto* end = reinterpret_cast<u8*>(entries.data() + next_entry_index + actual_entries);
+        const auto range_size = static_cast<std::size_t>(std::distance(begin, end));
 
         next_entry_index += actual_entries;
 
-        // Convert the data into a byte array
-        std::vector<u8> output(entry_data.size() * sizeof(FileSys::Entry));
-        std::memcpy(output.data(), entry_data.data(), output.size());
-
         // Write the data to memory
-        ctx.WriteBuffer(output);
+        ctx.WriteBuffer(begin, range_size);
 
         IPC::ResponseBuilder rb{ctx, 4};
         rb.Push(RESULT_SUCCESS);

src/core/memory.cpp

@@ -5,6 +5,8 @@
 #include <algorithm>
 #include <array>
 #include <cstring>
+#include <utility>
+
 #include <boost/optional.hpp>
 #include "common/assert.h"
 #include "common/common_types.h"
@@ -74,7 +76,7 @@ void MapIoRegion(PageTable& page_table, VAddr base, u64 size, MemoryHookPointer
     MapPages(page_table, base / PAGE_SIZE, size / PAGE_SIZE, nullptr, PageType::Special);
 
     auto interval = boost::icl::discrete_interval<VAddr>::closed(base, base + size - 1);
-    SpecialRegion region{SpecialRegion::Type::IODevice, mmio_handler};
+    SpecialRegion region{SpecialRegion::Type::IODevice, std::move(mmio_handler)};
     page_table.special_regions.add(std::make_pair(interval, std::set<SpecialRegion>{region}));
 }
 
@@ -89,13 +91,13 @@ void UnmapRegion(PageTable& page_table, VAddr base, u64 size) {
 
 void AddDebugHook(PageTable& page_table, VAddr base, u64 size, MemoryHookPointer hook) {
     auto interval = boost::icl::discrete_interval<VAddr>::closed(base, base + size - 1);
-    SpecialRegion region{SpecialRegion::Type::DebugHook, hook};
+    SpecialRegion region{SpecialRegion::Type::DebugHook, std::move(hook)};
     page_table.special_regions.add(std::make_pair(interval, std::set<SpecialRegion>{region}));
 }
 
 void RemoveDebugHook(PageTable& page_table, VAddr base, u64 size, MemoryHookPointer hook) {
     auto interval = boost::icl::discrete_interval<VAddr>::closed(base, base + size - 1);
-    SpecialRegion region{SpecialRegion::Type::DebugHook, hook};
+    SpecialRegion region{SpecialRegion::Type::DebugHook, std::move(hook)};
     page_table.special_regions.subtract(std::make_pair(interval, std::set<SpecialRegion>{region}));
 }