fsmitm_romfsbuild: avoid unnecessary copies of vfs pointers

src/core/core.cpp

@@ -116,11 +116,8 @@ FileSys::VirtualFile GetGameFileFromPath(const FileSys::VirtualFilesystem& vfs,
             }
         }
 
-        if (concat.empty()) {
-            return nullptr;
-        }
-
-        return FileSys::ConcatenatedVfsFile::MakeConcatenatedFile(concat, dir->GetName());
+        return FileSys::ConcatenatedVfsFile::MakeConcatenatedFile(dir->GetName(),
+                                                                  std::move(concat));
     }
 
     if (Common::FS::IsDir(path)) {

src/core/file_sys/fsmitm_romfsbuild.cpp

@@ -107,62 +107,56 @@ static u64 romfs_get_hash_table_count(u64 num_entries) {
 
 void RomFSBuildContext::VisitDirectory(VirtualDir romfs_dir, VirtualDir ext_dir,
                                        std::shared_ptr<RomFSBuildDirectoryContext> parent) {
-    std::vector<std::shared_ptr<RomFSBuildDirectoryContext>> child_dirs;
+    for (auto& child_romfs_file : romfs_dir->GetFiles()) {
+        const auto name = child_romfs_file->GetName();
+        const auto child = std::make_shared<RomFSBuildFileContext>();
+        // Set child's path.
+        child->cur_path_ofs = parent->path_len + 1;
+        child->path_len = child->cur_path_ofs + static_cast<u32>(name.size());
+        child->path = parent->path + "/" + name;
+
+        if (ext_dir != nullptr && ext_dir->GetFile(name + ".stub") != nullptr) {
+            continue;
+        }
 
-    const auto entries = romfs_dir->GetEntries();
+        // Sanity check on path_len
+        ASSERT(child->path_len < FS_MAX_PATH);
 
-    for (const auto& kv : entries) {
-        if (kv.second == VfsEntryType::Directory) {
-            const auto child = std::make_shared<RomFSBuildDirectoryContext>();
-            // Set child's path.
-            child->cur_path_ofs = parent->path_len + 1;
-            child->path_len = child->cur_path_ofs + static_cast<u32>(kv.first.size());
-            child->path = parent->path + "/" + kv.first;
+        child->source = std::move(child_romfs_file);
 
-            if (ext_dir != nullptr && ext_dir->GetFile(kv.first + ".stub") != nullptr) {
-                continue;
+        if (ext_dir != nullptr) {
+            if (const auto ips = ext_dir->GetFile(name + ".ips")) {
+                if (auto patched = PatchIPS(child->source, ips)) {
+                    child->source = std::move(patched);
+                }
             }
+        }
 
-            // Sanity check on path_len
-            ASSERT(child->path_len < FS_MAX_PATH);
-
-            if (AddDirectory(parent, child)) {
-                child_dirs.push_back(child);
-            }
-        } else {
-            const auto child = std::make_shared<RomFSBuildFileContext>();
-            // Set child's path.
-            child->cur_path_ofs = parent->path_len + 1;
-            child->path_len = child->cur_path_ofs + static_cast<u32>(kv.first.size());
-            child->path = parent->path + "/" + kv.first;
-
-            if (ext_dir != nullptr && ext_dir->GetFile(kv.first + ".stub") != nullptr) {
-                continue;
-            }
+        child->size = child->source->GetSize();
 
-            // Sanity check on path_len
-            ASSERT(child->path_len < FS_MAX_PATH);
+        AddFile(parent, child);
+    }
 
-            child->source = romfs_dir->GetFile(kv.first);
+    for (auto& child_romfs_dir : romfs_dir->GetSubdirectories()) {
+        const auto name = child_romfs_dir->GetName();
+        const auto child = std::make_shared<RomFSBuildDirectoryContext>();
+        // Set child's path.
+        child->cur_path_ofs = parent->path_len + 1;
+        child->path_len = child->cur_path_ofs + static_cast<u32>(name.size());
+        child->path = parent->path + "/" + name;
 
-            if (ext_dir != nullptr) {
-                if (const auto ips = ext_dir->GetFile(kv.first + ".ips")) {
-                    if (auto patched = PatchIPS(child->source, ips)) {
-                        child->source = std::move(patched);
-                    }
-                }
-            }
+        if (ext_dir != nullptr && ext_dir->GetFile(name + ".stub") != nullptr) {
+            continue;
+        }
 
-            child->size = child->source->GetSize();
+        // Sanity check on path_len
+        ASSERT(child->path_len < FS_MAX_PATH);
 
-            AddFile(parent, child);
+        if (!AddDirectory(parent, child)) {
+            continue;
         }
-    }
 
-    for (auto& child : child_dirs) {
-        auto subdir_name = std::string_view(child->path).substr(child->cur_path_ofs);
-        auto child_romfs_dir = romfs_dir->GetSubdirectory(subdir_name);
-        auto child_ext_dir = ext_dir != nullptr ? ext_dir->GetSubdirectory(subdir_name) : nullptr;
+        auto child_ext_dir = ext_dir != nullptr ? ext_dir->GetSubdirectory(name) : nullptr;
         this->VisitDirectory(child_romfs_dir, child_ext_dir, child);
     }
 }
@@ -293,7 +287,7 @@ std::multimap<u64, VirtualFile> RomFSBuildContext::Build() {
 
         cur_entry.name_size = name_size;
 
-        out.emplace(cur_file->offset + ROMFS_FILEPARTITION_OFS, cur_file->source);
+        out.emplace(cur_file->offset + ROMFS_FILEPARTITION_OFS, std::move(cur_file->source));
         std::memcpy(file_table.data() + cur_file->entry_offset, &cur_entry, sizeof(RomFSFileEntry));
         std::memset(file_table.data() + cur_file->entry_offset + sizeof(RomFSFileEntry), 0,
                     Common::AlignUp(cur_entry.name_size, 4));

src/core/file_sys/patch_manager.cpp

@@ -377,16 +377,16 @@ static void ApplyLayeredFS(VirtualFile& romfs, u64 title_id, ContentRecordType t
 
         auto romfs_dir = FindSubdirectoryCaseless(subdir, "romfs");
         if (romfs_dir != nullptr)
-            layers.push_back(std::make_shared<CachedVfsDirectory>(romfs_dir));
+            layers.emplace_back(std::make_shared<CachedVfsDirectory>(std::move(romfs_dir)));
 
         auto ext_dir = FindSubdirectoryCaseless(subdir, "romfs_ext");
         if (ext_dir != nullptr)
-            layers_ext.push_back(std::make_shared<CachedVfsDirectory>(ext_dir));
+            layers_ext.emplace_back(std::make_shared<CachedVfsDirectory>(std::move(ext_dir)));
 
         if (type == ContentRecordType::HtmlDocument) {
             auto manual_dir = FindSubdirectoryCaseless(subdir, "manual_html");
             if (manual_dir != nullptr)
-                layers.push_back(std::make_shared<CachedVfsDirectory>(manual_dir));
+                layers.emplace_back(std::make_shared<CachedVfsDirectory>(std::move(manual_dir)));
         }
     }
 
@@ -400,7 +400,7 @@ static void ApplyLayeredFS(VirtualFile& romfs, u64 title_id, ContentRecordType t
         return;
     }
 
-    layers.push_back(std::move(extracted));
+    layers.emplace_back(std::move(extracted));
 
     auto layered = LayeredVfsDirectory::MakeLayeredDirectory(std::move(layers));
     if (layered == nullptr) {

src/core/file_sys/registered_cache.cpp

@@ -322,7 +322,8 @@ VirtualFile RegisteredCache::OpenFileOrDirectoryConcat(const VirtualDir& open_di
         return nullptr;
     }
 
-    return ConcatenatedVfsFile::MakeConcatenatedFile(concat, concat.front()->GetName());
+    auto name = concat.front()->GetName();
+    return ConcatenatedVfsFile::MakeConcatenatedFile(std::move(name), std::move(concat));
 }
 
 VirtualFile RegisteredCache::GetFileAtID(NcaID id) const {

src/core/file_sys/romfs.cpp

@@ -133,7 +133,7 @@ VirtualDir ExtractRomFS(VirtualFile file, RomFSExtractionType type) {
         out = out->GetSubdirectories().front();
     }
 
-    return std::make_shared<CachedVfsDirectory>(out);
+    return std::make_shared<CachedVfsDirectory>(std::move(out));
 }
 
 VirtualFile CreateRomFS(VirtualDir dir, VirtualDir ext) {
@@ -141,8 +141,7 @@ VirtualFile CreateRomFS(VirtualDir dir, VirtualDir ext) {
         return nullptr;
 
     RomFSBuildContext ctx{dir, ext};
-    auto file_map = ctx.Build();
-    return ConcatenatedVfsFile::MakeConcatenatedFile(0, file_map, dir->GetName());
+    return ConcatenatedVfsFile::MakeConcatenatedFile(0, dir->GetName(), ctx.Build());
 }
 
 } // namespace FileSys

src/core/file_sys/vfs_cached.cpp

@@ -6,13 +6,13 @@
 
 namespace FileSys {
 
-CachedVfsDirectory::CachedVfsDirectory(VirtualDir& source_dir)
+CachedVfsDirectory::CachedVfsDirectory(VirtualDir&& source_dir)
     : name(source_dir->GetName()), parent(source_dir->GetParentDirectory()) {
     for (auto& dir : source_dir->GetSubdirectories()) {
-        dirs.emplace(dir->GetName(), std::make_shared<CachedVfsDirectory>(dir));
+        dirs.emplace(dir->GetName(), std::make_shared<CachedVfsDirectory>(std::move(dir)));
     }
     for (auto& file : source_dir->GetFiles()) {
-        files.emplace(file->GetName(), file);
+        files.emplace(file->GetName(), std::move(file));
     }
 }
 

src/core/file_sys/vfs_cached.h

@@ -11,7 +11,7 @@ namespace FileSys {
 
 class CachedVfsDirectory : public ReadOnlyVfsDirectory {
 public:
-    CachedVfsDirectory(VirtualDir& source_directory);
+    CachedVfsDirectory(VirtualDir&& source_directory);
 
     ~CachedVfsDirectory() override;
     VirtualFile GetFile(std::string_view file_name) const override;

src/core/file_sys/vfs_concat.cpp

@@ -10,7 +10,7 @@
 
 namespace FileSys {
 
-ConcatenatedVfsFile::ConcatenatedVfsFile(ConcatenationMap&& concatenation_map_, std::string&& name_)
+ConcatenatedVfsFile::ConcatenatedVfsFile(std::string&& name_, ConcatenationMap&& concatenation_map_)
     : concatenation_map(std::move(concatenation_map_)), name(std::move(name_)) {
     DEBUG_ASSERT(this->VerifyContinuity());
 }
@@ -30,8 +30,8 @@ bool ConcatenatedVfsFile::VerifyContinuity() const {
 
 ConcatenatedVfsFile::~ConcatenatedVfsFile() = default;
 
-VirtualFile ConcatenatedVfsFile::MakeConcatenatedFile(const std::vector<VirtualFile>& files,
-                                                      std::string&& name) {
+VirtualFile ConcatenatedVfsFile::MakeConcatenatedFile(std::string&& name,
+                                                      std::vector<VirtualFile>&& files) {
     // Fold trivial cases.
     if (files.empty()) {
         return nullptr;
@@ -46,20 +46,21 @@ VirtualFile ConcatenatedVfsFile::MakeConcatenatedFile(const std::vector<VirtualF
     u64 last_offset = 0;
 
     for (auto& file : files) {
+        const auto size = file->GetSize();
+
         concatenation_map.emplace_back(ConcatenationEntry{
             .offset = last_offset,
-            .file = file,
+            .file = std::move(file),
         });
 
-        last_offset += file->GetSize();
+        last_offset += size;
     }
 
-    return VirtualFile(new ConcatenatedVfsFile(std::move(concatenation_map), std::move(name)));
+    return VirtualFile(new ConcatenatedVfsFile(std::move(name), std::move(concatenation_map)));
 }
 
-VirtualFile ConcatenatedVfsFile::MakeConcatenatedFile(u8 filler_byte,
-                                                      const std::multimap<u64, VirtualFile>& files,
-                                                      std::string&& name) {
+VirtualFile ConcatenatedVfsFile::MakeConcatenatedFile(u8 filler_byte, std::string&& name,
+                                                      std::multimap<u64, VirtualFile>&& files) {
     // Fold trivial cases.
     if (files.empty()) {
         return nullptr;
@@ -76,6 +77,8 @@ VirtualFile ConcatenatedVfsFile::MakeConcatenatedFile(u8 filler_byte,
 
     // Iteration of a multimap is ordered, so offset will be strictly non-decreasing.
     for (auto& [offset, file] : files) {
+        const auto size = file->GetSize();
+
         if (offset > last_offset) {
             concatenation_map.emplace_back(ConcatenationEntry{
                 .offset = last_offset,
@@ -85,13 +88,13 @@ VirtualFile ConcatenatedVfsFile::MakeConcatenatedFile(u8 filler_byte,
 
         concatenation_map.emplace_back(ConcatenationEntry{
             .offset = offset,
-            .file = file,
+            .file = std::move(file),
         });
 
-        last_offset = offset + file->GetSize();
+        last_offset = offset + size;
     }
 
-    return VirtualFile(new ConcatenatedVfsFile(std::move(concatenation_map), std::move(name)));
+    return VirtualFile(new ConcatenatedVfsFile(std::move(name), std::move(concatenation_map)));
 }
 
 std::string ConcatenatedVfsFile::GetName() const {

src/core/file_sys/vfs_concat.h

@@ -24,22 +24,20 @@ private:
     };
     using ConcatenationMap = std::vector<ConcatenationEntry>;
 
-    explicit ConcatenatedVfsFile(std::vector<ConcatenationEntry>&& concatenation_map,
-                                 std::string&& name);
+    explicit ConcatenatedVfsFile(std::string&& name,
+                                 std::vector<ConcatenationEntry>&& concatenation_map);
     bool VerifyContinuity() const;
 
 public:
     ~ConcatenatedVfsFile() override;
 
     /// Wrapper function to allow for more efficient handling of files.size() == 0, 1 cases.
-    static VirtualFile MakeConcatenatedFile(const std::vector<VirtualFile>& files,
-                                            std::string&& name);
+    static VirtualFile MakeConcatenatedFile(std::string&& name, std::vector<VirtualFile>&& files);
 
     /// Convenience function that turns a map of offsets to files into a concatenated file, filling
     /// gaps with a given filler byte.
-    static VirtualFile MakeConcatenatedFile(u8 filler_byte,
-                                            const std::multimap<u64, VirtualFile>& files,
-                                            std::string&& name);
+    static VirtualFile MakeConcatenatedFile(u8 filler_byte, std::string&& name,
+                                            std::multimap<u64, VirtualFile>&& files);
 
     std::string GetName() const override;
     std::size_t GetSize() const override;

src/core/file_sys/vfs_layered.cpp

@@ -38,7 +38,7 @@ VirtualDir LayeredVfsDirectory::GetDirectoryRelative(std::string_view path) cons
     for (const auto& layer : dirs) {
         auto dir = layer->GetDirectoryRelative(path);
         if (dir != nullptr) {
-            out.push_back(std::move(dir));
+            out.emplace_back(std::move(dir));
         }
     }
 
@@ -62,11 +62,11 @@ std::vector<VirtualFile> LayeredVfsDirectory::GetFiles() const {
     std::set<std::string, std::less<>> out_names;
 
     for (const auto& layer : dirs) {
-        for (const auto& file : layer->GetFiles()) {
+        for (auto& file : layer->GetFiles()) {
             auto file_name = file->GetName();
             if (!out_names.contains(file_name)) {
                 out_names.emplace(std::move(file_name));
-                out.push_back(file);
+                out.emplace_back(std::move(file));
             }
         }
     }
@@ -86,7 +86,7 @@ std::vector<VirtualDir> LayeredVfsDirectory::GetSubdirectories() const {
     std::vector<VirtualDir> out;
     out.reserve(names.size());
     for (const auto& subdir : names)
-        out.push_back(GetSubdirectory(subdir));
+        out.emplace_back(GetSubdirectory(subdir));
 
     return out;
 }