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reduce mem. usage of unused and update staticcheck
The primary improvement is in early clearing of analyzed package's TypeInfo, facts, etc for whole program analyzers (`unused`). Clear it when it becomes unused and GC collects them early. Initially this clearing was performed for all analyzers except `unused`. Update staticcheck from v0.0.1-2019.2.3 to v0.0.1-2020.1.4 Also in this commit: * speed up loading packages from export data (2.5s -> 2.1s for std) by not using mutex for export data since it was allowed in x/tools#07722704da13 * make an order of execution of linters stable * update renameio and robustio * use robustio in caching Relates: #987, #994, #995, #1011
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,29 @@ | ||
// Copyright 2019 The Go Authors. All rights reserved. | ||
// Use of this source code is governed by a BSD-style | ||
// license that can be found in the LICENSE file. | ||
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package robustio | ||
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import ( | ||
"os" | ||
"syscall" | ||
) | ||
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const errFileNotFound = syscall.ENOENT | ||
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// isEphemeralError returns true if err may be resolved by waiting. | ||
func isEphemeralError(err error) bool { | ||
switch werr := err.(type) { | ||
case *os.PathError: | ||
err = werr.Err | ||
case *os.LinkError: | ||
err = werr.Err | ||
case *os.SyscallError: | ||
err = werr.Err | ||
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} | ||
if errno, ok := err.(syscall.Errno); ok { | ||
return errno == errFileNotFound | ||
} | ||
return false | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,93 @@ | ||
// Copyright 2019 The Go Authors. All rights reserved. | ||
// Use of this source code is governed by a BSD-style | ||
// license that can be found in the LICENSE file. | ||
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// +build windows darwin | ||
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package robustio | ||
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import ( | ||
"io/ioutil" | ||
"math/rand" | ||
"os" | ||
"syscall" | ||
"time" | ||
) | ||
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const arbitraryTimeout = 500 * time.Millisecond | ||
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const ERROR_SHARING_VIOLATION = 32 | ||
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// retry retries ephemeral errors from f up to an arbitrary timeout | ||
// to work around filesystem flakiness on Windows and Darwin. | ||
func retry(f func() (err error, mayRetry bool)) error { | ||
var ( | ||
bestErr error | ||
lowestErrno syscall.Errno | ||
start time.Time | ||
nextSleep time.Duration = 1 * time.Millisecond | ||
) | ||
for { | ||
err, mayRetry := f() | ||
if err == nil || !mayRetry { | ||
return err | ||
} | ||
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if errno, ok := err.(syscall.Errno); ok && (lowestErrno == 0 || errno < lowestErrno) { | ||
bestErr = err | ||
lowestErrno = errno | ||
} else if bestErr == nil { | ||
bestErr = err | ||
} | ||
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if start.IsZero() { | ||
start = time.Now() | ||
} else if d := time.Since(start) + nextSleep; d >= arbitraryTimeout { | ||
break | ||
} | ||
time.Sleep(nextSleep) | ||
nextSleep += time.Duration(rand.Int63n(int64(nextSleep))) | ||
} | ||
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return bestErr | ||
} | ||
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// rename is like os.Rename, but retries ephemeral errors. | ||
// | ||
// On windows it wraps os.Rename, which (as of 2019-06-04) uses MoveFileEx with | ||
// MOVEFILE_REPLACE_EXISTING. | ||
// | ||
// Windows also provides a different system call, ReplaceFile, | ||
// that provides similar semantics, but perhaps preserves more metadata. (The | ||
// documentation on the differences between the two is very sparse.) | ||
// | ||
// Empirical error rates with MoveFileEx are lower under modest concurrency, so | ||
// for now we're sticking with what the os package already provides. | ||
func rename(oldpath, newpath string) (err error) { | ||
return retry(func() (err error, mayRetry bool) { | ||
err = os.Rename(oldpath, newpath) | ||
return err, isEphemeralError(err) | ||
}) | ||
} | ||
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// readFile is like ioutil.ReadFile, but retries ephemeral errors. | ||
func readFile(filename string) ([]byte, error) { | ||
var b []byte | ||
err := retry(func() (err error, mayRetry bool) { | ||
b, err = ioutil.ReadFile(filename) | ||
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// Unlike in rename, we do not retry errFileNotFound here: it can occur | ||
// as a spurious error, but the file may also genuinely not exist, so the | ||
// increase in robustness is probably not worth the extra latency. | ||
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return err, isEphemeralError(err) && err != errFileNotFound | ||
}) | ||
return b, err | ||
} | ||
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func removeAll(path string) error { | ||
return retry(func() (err error, mayRetry bool) { | ||
err = os.RemoveAll(path) | ||
return err, isEphemeralError(err) | ||
}) | ||
} |
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