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|
-- modified version from https://github.com/lewis6991/impatient.nvim
local vim = vim
local uv = vim.loop
local impatient_load_start = uv.hrtime()
local api = vim.api
local ffi = require "ffi"
local get_option, set_option = api.nvim_get_option, api.nvim_set_option
local get_runtime_file = api.nvim_get_runtime_file
local impatient_dur
local M = {
cache = {},
profile = nil,
dirty = false,
path = nil,
log = {},
}
_G.__luacache = M
--{{{
local cachepack = {}
-- using double for packing/unpacking numbers has no conversion overhead
-- 32-bit ARM causes a bus error when casting to double, so use int there
local number_t = jit.arch ~= "arm" and "double" or "int"
ffi.cdef("typedef " .. number_t .. " number_t;")
local c_number_t = ffi.typeof "number_t[1]"
local c_sizeof_number_t = ffi.sizeof "number_t"
local out_buf = {}
function out_buf.write_number(buf, num)
buf[#buf + 1] = ffi.string(c_number_t(num), c_sizeof_number_t)
end
function out_buf.write_string(buf, str)
out_buf.write_number(buf, #str)
buf[#buf + 1] = str
end
function out_buf.to_string(buf)
return table.concat(buf)
end
local in_buf = {}
function in_buf.read_number(buf)
if buf.size < buf.pos then
error "buffer access violation"
end
local res = ffi.cast("number_t*", buf.ptr + buf.pos)[0]
buf.pos = buf.pos + c_sizeof_number_t
return res
end
function in_buf.read_string(buf)
local len = in_buf.read_number(buf)
local res = ffi.string(buf.ptr + buf.pos, len)
buf.pos = buf.pos + len
return res
end
function cachepack.pack(cache)
local total_keys = vim.tbl_count(cache)
local buf = {}
out_buf.write_number(buf, total_keys)
for k, v in pairs(cache) do
out_buf.write_string(buf, k)
out_buf.write_string(buf, v[1] or "")
out_buf.write_number(buf, v[2] or 0)
out_buf.write_string(buf, v[3] or "")
end
return out_buf.to_string(buf)
end
function cachepack.unpack(str, raw_buf_size)
if raw_buf_size == 0 or str == nil or (raw_buf_size == nil and #str == 0) then
return {}
end
local buf = {
ptr = raw_buf_size and str or ffi.new("const char[?]", #str, str),
pos = 0,
size = raw_buf_size or #str,
}
local cache = {}
local total_keys = in_buf.read_number(buf)
for _ = 1, total_keys do
local k = in_buf.read_string(buf)
local v = {
in_buf.read_string(buf),
in_buf.read_number(buf),
in_buf.read_string(buf),
}
cache[k] = v
end
return cache
end
--}}}
local function log(...)
M.log[#M.log + 1] = table.concat({ string.format(...) }, " ")
end
function M.print_log()
for _, l in ipairs(M.log) do
print(l)
end
end
function M.enable_profile()
M.profile = {}
M.print_profile = function()
M.profile["impatient"] = {
resolve = 0,
load = impatient_dur,
loader = "standard",
}
require("impatient.profile").print_profile(M.profile)
end
vim.cmd [[command! LuaCacheProfile lua _G.__luacache.print_profile()]]
end
local function is_cacheable(path)
-- Don't cache files in /tmp since they are not likely to persist.
-- Note: Appimage versions of Neovim mount $VIMRUNTIME in /tmp in a unique
-- directory on each launch.
return not vim.startswith(path, "/tmp/")
end
local function hash(modpath)
local stat = uv.fs_stat(modpath)
if stat then
return stat.mtime.sec
end
end
local function hrtime()
if M.profile then
return uv.hrtime()
end
end
local function load_package_with_cache(name, loader)
local resolve_start = hrtime()
local basename = name:gsub("%.", "/")
local paths = { "lua/" .. basename .. ".lua", "lua/" .. basename .. "/init.lua" }
for _, path in ipairs(paths) do
local modpath = get_runtime_file(path, false)[1]
if modpath then
local load_start = hrtime()
local chunk, err = loadfile(modpath)
if M.profile then
M.profile[name] = {
resolve = load_start - resolve_start,
load = hrtime() - load_start,
loader = loader or "standard",
}
end
if chunk == nil then
return err
end
if is_cacheable(modpath) then
log("Creating cache for module %s", name)
M.cache[name] = { modpath, hash(modpath), string.dump(chunk) }
M.dirty = true
else
log("Unable to cache module %s", name)
end
return chunk
end
end
return nil
end
local reduced_rtp
-- Speed up non-cached loads by reducing the rtp path during requires
function M.update_reduced_rtp()
local luadirs = get_runtime_file("lua/", true)
for i = 1, #luadirs do
luadirs[i] = luadirs[i]:sub(1, -6)
end
reduced_rtp = table.concat(luadirs, ",")
end
local function load_package_with_cache_reduced_rtp(name)
local orig_rtp = get_option "runtimepath"
local orig_ei = get_option "eventignore"
if not reduced_rtp then
M.update_reduced_rtp()
end
set_option("eventignore", "all")
set_option("rtp", reduced_rtp)
local found = load_package_with_cache(name, "reduced")
set_option("rtp", orig_rtp)
set_option("eventignore", orig_ei)
return found
end
local function load_from_cache(name)
local resolve_start = hrtime()
if M.cache[name] == nil then
log("No cache for module %s", name)
return "No cache entry"
end
local modpath, mhash, codes = unpack(M.cache[name])
if mhash ~= hash(modpath) then
log("Stale cache for module %s", name)
M.cache[name] = nil
M.dirty = true
return "Stale cache"
end
local load_start = hrtime()
local chunk = loadstring(codes)
if M.profile then
M.profile[name] = {
resolve = load_start - resolve_start,
load = hrtime() - load_start,
loader = "cache",
}
end
if not chunk then
M.cache[name] = nil
M.dirty = true
log("Error loading cache for module. Invalidating", name)
return "Cache error"
end
return chunk
end
function M.save_cache()
if M.dirty then
log("Updating cache file: %s", M.path)
local f = io.open(M.path, "w+b")
f:write(cachepack.pack(M.cache))
f:flush()
M.dirty = false
end
end
function M.clear_cache()
M.cache = {}
os.remove(M.path)
end
impatient_dur = uv.hrtime() - impatient_load_start
function M.setup(opts)
opts = opts or {}
M.path = opts.path or vim.fn.stdpath "cache" .. "/nvim_cache"
if opts.enable_profiling then
M.enable_profile()
end
local impatient_setup_start = uv.hrtime()
local stat = uv.fs_stat(M.path)
if stat then
log("Loading cache file %s", M.path)
local ok
-- Linux/macOS lets us easily mmap the cache file for faster reads without passing to Lua
if jit.os == "Linux" or jit.os == "OSX" then
local size = stat.size
local C = ffi.C
local O_RDONLY = 0x00
local PROT_READ = 0x01
local MAP_PRIVATE = 0x02
ffi.cdef [[
int open(const char *pathname, int flags);
int close(int fd);
void *mmap(void *addr, size_t length, int prot, int flags, int fd, long int offset);
int munmap(void *addr, size_t length);
]]
local f = C.open(M.path, O_RDONLY)
local addr = C.mmap(nil, size, PROT_READ, MAP_PRIVATE, f, 0)
ok = ffi.cast("intptr_t", addr) ~= -1
if ok then
M.cache = cachepack.unpack(ffi.cast("char *", addr), size)
C.munmap(addr, size)
end
C.close(f)
else
local f = io.open(M.path, "rb")
ok, M.cache = pcall(function()
return cachepack.unpack(f:read "*a")
end)
end
if not ok then
log("Corrupted cache file, %s. Invalidating...", M.path)
os.remove(M.path)
M.cache = {}
end
M.dirty = not ok
end
local insert = table.insert
local package = package
-- Fix the position of the preloader. This also makes loading modules like 'ffi'
-- and 'bit' quicker
if package.loaders[1] == vim._load_package then
-- Move vim._load_package to the second position
local vim_load = table.remove(package.loaders, 1)
insert(package.loaders, 2, vim_load)
end
insert(package.loaders, 2, load_from_cache)
insert(package.loaders, 3, load_package_with_cache_reduced_rtp)
insert(package.loaders, 4, load_package_with_cache)
vim.cmd [[
augroup impatient
autocmd VimEnter,VimLeave * lua _G.__luacache.save_cache()
autocmd OptionSet runtimepath lua _G.__luacache.update_reduced_rtp(true)
augroup END
command! LuaCacheClear lua _G.__luacache.clear_cache()
command! LuaCacheLog lua _G.__luacache.print_log()
]]
impatient_dur = impatient_dur + (uv.hrtime() - impatient_setup_start)
end
return M
|