refactor(loader): simplify tracking logic

runtime/lua/vim/loader.lua

@@ -41,14 +41,6 @@ local Loader = {
   },
 }
 
---- Tracks the time spent in a function
----@private
-function Loader.track(stat, start)
-  Loader._stats[stat] = Loader._stats[stat] or { total = 0, time = 0 }
-  Loader._stats[stat].total = Loader._stats[stat].total + 1
-  Loader._stats[stat].time = Loader._stats[stat].time + uv.hrtime() - start
-end
-
 ---@private
 local function normalize(path)
   return vim.fs.normalize(path, { expand_env = false })
@@ -60,9 +52,7 @@ end
 --- @return string[] rtp, boolean updated
 ---@private
 function Loader.get_rtp()
-  local start = uv.hrtime()
   if vim.in_fast_event() then
-    Loader.track('get_rtp', start)
     return (Loader._rtp or {}), false
   end
   local updated = false
@@ -82,7 +72,6 @@ function Loader.get_rtp()
     updated = true
     Loader._rtp_key = key
   end
-  Loader.track('get_rtp', start)
   return Loader._rtp, updated
 end
 
@@ -118,7 +107,6 @@ end
 ---@return CacheEntry?
 ---@private
 function Loader.read(name)
-  local start = uv.hrtime()
   local cname = Loader.cache_file(name)
   local f = uv.fs_open(cname, 'r', 438)
   if f then
@@ -136,7 +124,6 @@ function Loader.read(name)
     if tonumber(header[1]) ~= Loader.VERSION then
       return
     end
-    Loader.track('read', start)
     return {
       hash = {
         size = tonumber(header[2]),
@@ -145,7 +132,6 @@ function Loader.read(name)
       chunk = data:sub(zero + 1),
     }
   end
-  Loader.track('read', start)
 end
 
 --- The `package.loaders` loader for lua files using the cache.
@@ -153,14 +139,11 @@ end
 ---@return string|function
 ---@private
 function Loader.loader(modname)
-  local start = uv.hrtime()
   local ret = M.find(modname)[1]
   if ret then
     local chunk, err = Loader.load(ret.modpath, { hash = ret.stat })
-    Loader.track('loader', start)
     return chunk or error(err)
   end
-  Loader.track('loader', start)
   return '\ncache_loader: module ' .. modname .. ' not found'
 end
 
@@ -169,7 +152,6 @@ end
 ---@return string|function
 ---@private
 function Loader.loader_lib(modname)
-  local start = uv.hrtime()
   local sysname = uv.os_uname().sysname:lower() or ''
   local is_win = sysname:find('win', 1, true) and not sysname:find('darwin', 1, true)
   local ret = M.find(modname, { patterns = is_win and { '.dll' } or { '.so' } })[1]
@@ -183,10 +165,8 @@ function Loader.loader_lib(modname)
     local dash = modname:find('-', 1, true)
     local funcname = dash and modname:sub(dash + 1) or modname
     local chunk, err = package.loadlib(ret.modpath, 'luaopen_' .. funcname:gsub('%.', '_'))
-    Loader.track('loader_lib', start)
     return chunk or error(err)
   end
-  Loader.track('loader_lib', start)
   return '\ncache_loader_lib: module ' .. modname .. ' not found'
 end
 
@@ -199,12 +179,9 @@ end
 ---@private
 -- luacheck: ignore 312
 function Loader.loadfile(filename, mode, env, hash)
-  local start = uv.hrtime()
-  filename = normalize(filename)
-  mode = nil -- ignore mode, since we byte-compile the lua source files
-  local chunk, err = Loader.load(filename, { mode = mode, env = env, hash = hash })
-  Loader.track('loadfile', start)
-  return chunk, err
+  -- ignore mode, since we byte-compile the lua source files
+  mode = nil
+  return Loader.load(normalize(filename), { mode = mode, env = env, hash = hash })
 end
 
 --- Checks whether two cache hashes are the same based on:
@@ -232,8 +209,6 @@ end
 ---@return function?, string? error_message
 ---@private
 function Loader.load(modpath, opts)
-  local start = uv.hrtime()
-
   opts = opts or {}
   local hash = opts.hash or uv.fs_stat(modpath)
   ---@type function?, string?
@@ -241,9 +216,7 @@ function Loader.load(modpath, opts)
 
   if not hash then
     -- trigger correct error
-    chunk, err = Loader._loadfile(modpath, opts.mode, opts.env)
-    Loader.track('load', start)
-    return chunk, err
+    return Loader._loadfile(modpath, opts.mode, opts.env)
   end
 
   local entry = Loader.read(modpath)
@@ -251,7 +224,6 @@ function Loader.load(modpath, opts)
     -- found in cache and up to date
     chunk, err = load(entry.chunk --[[@as string]], '@' .. modpath, opts.mode, opts.env)
     if not (err and err:find('cannot load incompatible bytecode', 1, true)) then
-      Loader.track('load', start)
       return chunk, err
     end
   end
@@ -262,7 +234,6 @@ function Loader.load(modpath, opts)
     entry.chunk = string.dump(chunk)
     Loader.write(modpath, entry)
   end
-  Loader.track('load', start)
   return chunk, err
 end
 
@@ -280,7 +251,6 @@ end
 ---    - modname: (string) the name of the module
 ---    - stat: (table|nil) the fs_stat of the module path. Won't be returned for `modname="*"`
 function M.find(modname, opts)
-  local start = uv.hrtime()
   opts = opts or {}
 
   modname = modname:gsub('/', '.')
@@ -359,7 +329,6 @@ function M.find(modname, opts)
     _find(opts.paths)
   end
 
-  Loader.track('find', start)
   if #results == 0 then
     -- module not found
     Loader._stats.find.not_found = Loader._stats.find.not_found + 1
@@ -426,7 +395,6 @@ end
 ---@private
 function Loader.lsmod(path)
   if not Loader._indexed[path] then
-    local start = uv.hrtime()
     Loader._indexed[path] = {}
     for name, t in vim.fs.dir(path .. '/lua') do
       local modpath = path .. '/lua/' .. name
@@ -450,23 +418,41 @@ function Loader.lsmod(path)
         end
       end
     end
-    Loader.track('lsmod', start)
   end
   return Loader._indexed[path]
 end
 
+--- Tracks the time spent in a function
+--- @generic F: function
+--- @param f F
+--- @return F
+--- @private
+function Loader.track(stat, f)
+  return function(...)
+    local start = vim.loop.hrtime()
+    local r = { f(...) }
+    Loader._stats[stat] = Loader._stats[stat] or { total = 0, time = 0 }
+    Loader._stats[stat].total = Loader._stats[stat].total + 1
+    Loader._stats[stat].time = Loader._stats[stat].time + uv.hrtime() - start
+    return unpack(r, 1, table.maxn(r))
+  end
+end
+
+Loader.get_rtp = Loader.track('get_rtp', Loader.get_rtp)
+Loader.read = Loader.track('read', Loader.read)
+Loader.loader = Loader.track('loader', Loader.loader)
+Loader.loader_lib = Loader.track('loader_lib', Loader.loader_lib)
+Loader.loadfile = Loader.track('loadfile', Loader.loadfile)
+Loader.load = Loader.track('load', Loader.load)
+M.find = Loader.track('find', M.find)
+Loader.lsmod = Loader.track('lsmod', Loader.lsmod)
+
 --- Debug function that wrapps all loaders and tracks stats
 ---@private
 function M._profile_loaders()
   for l, loader in pairs(loaders) do
     local loc = debug.getinfo(loader, 'Sn').source:sub(2)
-    loaders[l] = function(modname)
-      local start = vim.loop.hrtime()
-      local ret = loader(modname)
-      Loader.track('loader ' .. l .. ': ' .. loc, start)
-      Loader.track('loader_all', start)
-      return ret
-    end
+    loaders[l] = Loader.track('loader ' .. l .. ': ' .. loc, loader)
   end
 end