cache.cpp keeps its C API but replaces uthash and the two mallocs per
entry with one slab of nodes holding their keys inline, linked in
last-use order, and an open-addressing index of node ids that hashes
through the slab with a per-cache random seed. Both blocks are reserved
by cache_create() and touched only as entries are used, so a large,
mostly empty cache costs no resident memory.
Semantics are unchanged: an insert evicts the least recently used entry
once the cache holds capacity entries (the AEAD-2022 session table's
4095/4096 boundary), lookups refresh recency and age, cache_clear()
drops stale entries, and free_cb may re-enter the cache. Re-inserting a
key now replaces its data instead of shadowing it. cache_create_keyed()
sizes keys per cache; the AEAD-2022 salt pool and session table use it.
test_cache_cpp covers the boundary, ordering, replacement, ageing,
re-entrant callbacks and limits; alloc_steady_cache requires zero
allocations across 100,000 inserts on a full cache. AEAD-2022 ss-server
drops from 84 to 80 allocations per relayed connection.
Rename utils, ss_event, udprelay, winsock, local, server, tunnel, redir
and manager from .c to .cpp. Inside the moved files only the
\snippet{doc} file references and header comments change; snippet
references in doc/*.md, tests/test_cli_docs.py, the build files and
CONTRIBUTION.md follow the new names.
Also cast the Windows-only string literal returned by
get_default_conf(), found by the zig x86_64-windows-gnu build.
Every module of src/ except the unbuilt android.c and the vendored
blake3 is now compiled as C++20. The new .cpp files join the no-heap
ratchet baseline.
Rename netutils, jconf, stream, aead, aead2022, aead2022_udp, crypto,
acl, plugin, plugin_disabled and resolv from .c to .cpp without changing
their contents, and update source lists, snippet references, test
comments and debian/copyright.
The Doxygen source list and scripts/check_cli_docs.py now accept either
extension for each module, so the remaining programs can move one at a
time. The new .cpp files are added to the no-heap ratchet baseline.
Rename base64, json, ipset, process, ppbloom, rule, ssurl and cache from
.c to .cpp without touching their contents, and update the CMake source
lists, debian/copyright and the docs.
Ported code keeps -Wall; -Wextra is now opt-in through
ss_strict_warnings() for code written as C++ (the core tests).
check_no_heap.py gains a ratchet baseline for the converted modules,
which still allocate the way the C code did. A new check_cxx_runtime
test verifies with nm that the programs and libshadowsocks-c.a still
need no C++ runtime library, so C consumers are unaffected.
Max Lv