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romfs: reduce peak allocation sizes by enabling intermediate context frees

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This commit is contained in:
Michael Scire 2023-01-24 14:01:38 -07:00
parent bf66e40a7b
commit 9cd57b6c61
2 changed files with 64 additions and 20 deletions
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59
stratosphere/ams_mitm/source/fs_mitm/fsmitm_romfs.cpp
View file

@ -80,6 +80,7 @@ namespace ams::mitm::fs {
while (m_cache == nullptr) {
cache_size >>= 1;
AMS_ABORT_UNLESS(cache_size >= 16_KB);
m_cache = std::malloc(cache_size);
}
m_cache_bitsize = util::CountTrailingZeros(cache_size);
}
@ -617,19 +618,42 @@ namespace ams::mitm::fs {
}
}
/* Replace sibling pointers with sibling entry_offsets, so that we can de-allocate as we go. */
{
/* Set all directories sibling and file pointers. */
for (const auto &it : m_directories) {
BuildDirectoryContext *cur_dir = it.get();
cur_dir->ClearHashMark();
cur_dir->sibling_offset = (cur_dir->sibling == nullptr) ? EmptyEntry : cur_dir->sibling->entry_offset;
cur_dir->child_offset = (cur_dir->child == nullptr) ? EmptyEntry : cur_dir->child->entry_offset;
cur_dir->file_offset = (cur_dir->file == nullptr) ? EmptyEntry : cur_dir->file->entry_offset;
cur_dir->parent_offset = cur_dir == m_root ? 0 : cur_dir->parent->entry_offset;
}
/* Replace all files' sibling pointers. */
for (const auto &it : m_files) {
BuildFileContext *cur_file = it.get();
cur_file->ClearHashMark();
cur_file->sibling_offset = (cur_file->sibling == nullptr) ? EmptyEntry : cur_file->sibling->entry_offset;
}
}
/* Write the file table. */
{
FileTableWriter file_table(std::addressof(metadata_file), m_dir_hash_table_size + m_dir_table_size + m_file_hash_table_size, m_file_table_size);
for (const auto &it : m_files) {
BuildFileContext *cur_file = it.get();
for (auto it = m_files.begin(); it != m_files.end(); it = m_files.erase(it)) {
BuildFileContext *cur_file = it->get();
FileEntry *cur_entry = file_table.GetEntry(cur_file->entry_offset, cur_file->path_len);
cur_file->ClearHashMark();
/* Set entry fields. */
cur_entry->parent = cur_file->parent->entry_offset;
cur_entry->sibling = (cur_file->sibling == nullptr) ? EmptyEntry : cur_file->sibling->entry_offset;
cur_entry->sibling = cur_file->sibling_offset;
cur_entry->offset = cur_file->offset;
cur_entry->size = cur_file->size;
cur_entry->hash = cur_file->hash_value;
@ -660,8 +684,15 @@ namespace ams::mitm::fs {
break;
case DataSourceType::LooseSdFile:
{
char *new_path = new char[cur_file->GetPathLength() + 1];
cur_file->GetPath(new_path);
char full_path[fs::EntryNameLengthMax + 1];
const size_t path_needed_size = cur_file->GetPathLength() + 1;
AMS_ABORT_UNLESS(path_needed_size <= sizeof(full_path));
cur_file->GetPath(full_path);
cur_file->path.reset();
char *new_path = new char[path_needed_size];
std::memcpy(new_path, full_path, path_needed_size);
out_infos->emplace_back(cur_file->offset + FilePartitionOffset, cur_file->size, cur_file->source_type, new_path);
}
break;
@ -674,17 +705,15 @@ namespace ams::mitm::fs {
{
DirectoryTableWriter dir_table(std::addressof(metadata_file), m_dir_hash_table_size, m_dir_table_size);
for (const auto &it : m_directories) {
BuildDirectoryContext *cur_dir = it.get();
for (auto it = m_directories.begin(); it != m_directories.end(); it = m_directories.erase(it)) {
BuildDirectoryContext *cur_dir = it->get();
DirectoryEntry *cur_entry = dir_table.GetEntry(cur_dir->entry_offset, cur_dir->path_len);
cur_dir->ClearHashMark();
/* Set entry fields. */
cur_entry->parent = cur_dir == m_root ? 0 : cur_dir->parent->entry_offset;
cur_entry->sibling = (cur_dir->sibling == nullptr) ? EmptyEntry : cur_dir->sibling->entry_offset;
cur_entry->child = (cur_dir->child == nullptr) ? EmptyEntry : cur_dir->child->entry_offset;
cur_entry->file = (cur_dir->file == nullptr) ? EmptyEntry : cur_dir->file->entry_offset;
cur_entry->parent = cur_dir->parent_offset;
cur_entry->sibling = cur_dir->sibling_offset;
cur_entry->child = cur_dir->child_offset;
cur_entry->file = cur_dir->file_offset;
cur_entry->hash = cur_dir->hash_value;
/* Set name. */

25
stratosphere/ams_mitm/source/fs_mitm/fsmitm_romfs.hpp
View file

@ -115,10 +115,22 @@ namespace ams::mitm::fs::romfs {
NON_MOVEABLE(BuildDirectoryContext);
std::unique_ptr<char[]> path;
BuildDirectoryContext *parent;
BuildDirectoryContext *child;
BuildDirectoryContext *sibling;
BuildFileContext *file;
union {
BuildDirectoryContext *parent;
u32 parent_offset;
};
union {
BuildDirectoryContext *child;
u32 child_offset;
};
union {
BuildDirectoryContext *sibling;
u32 sibling_offset;
};
union {
BuildFileContext *file;
u32 file_offset;
};
u32 path_len;
u32 entry_offset;
u32 hash_value;
@ -176,7 +188,10 @@ namespace ams::mitm::fs::romfs {
std::unique_ptr<char[]> path;
BuildDirectoryContext *parent;
BuildFileContext *sibling;
union {
BuildFileContext *sibling;
u32 sibling_offset;
};
s64 offset;
s64 size;
s64 orig_offset;