mirror of
https://github.com/golang/go
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07957b794c
Change-Id: Ie88fe441521d60a4ba54ebb418860d0f71073387 Reviewed-on: https://go-review.googlesource.com/c/go/+/216917 Reviewed-by: Bryan C. Mills <bcmills@google.com>
587 lines
20 KiB
HTML
587 lines
20 KiB
HTML
<!--{
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"Title": "Go 1.14 Release Notes",
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"Path": "/doc/go1.14",
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"Template": true
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}-->
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<!--
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NOTE: In this document and others in this directory, the convention is to
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set fixed-width phrases with non-fixed-width spaces, as in
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<code>hello</code> <code>world</code>.
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Do not send CLs removing the interior tags from such phrases.
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-->
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<style>
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main ul li { margin: 0.5em 0; }
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</style>
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<h2 id="introduction">DRAFT RELEASE NOTES — Introduction to Go 1.14</h2>
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<p>
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<strong>
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Go 1.14 is not yet released. These are work-in-progress
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release notes. Go 1.14 is expected to be released in February 2020.
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</strong>
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</p>
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<p>
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Module support in the <code>go</code> command is now ready for production use,
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and we encourage all users to migrate to Go modules for dependency management.
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</p>
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<p>
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If you are unable to migrate due to a problem in the Go toolchain,
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please ensure that the problem has an
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<a href="https://golang.org/issue?q=is%3Aissue+is%3Aopen+label%3Amodules">open issue</a>
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filed. (If the issue is not on the <code>Go1.15</code> milestone, please let us
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know why it prevents you from migrating so that we can prioritize it
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appropriately.)
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</p>
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<h2 id="language">Changes to the language</h2>
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<p>
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TODO
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</p>
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<p><!-- CL 187519 -->
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TODO: <a href="https://golang.org/cl/187519">https://golang.org/cl/187519</a>: allow embedding overlapping interfaces
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</p>
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<h2 id="ports">Ports</h2>
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<p>
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TODO: is Dragonfly passing? On both Dragonfly release & tip? (ABI
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change happened) Does the net package's interface APIs work on both?
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https://golang.org/issue/34368.
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</p>
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<p>
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TODO: is Illumos up with a builder and passing?
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https://golang.org/issue/15581.
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</p>
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<p>
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TODO: announce something about the Go Solaris port? Solaris itself
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is unmaintained? The builder is still running at Oracle, but the
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employee who set it up left the company and we have no way to
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maintain it.
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</p>
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<h3 id="darwin">Darwin</h3>
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<p>
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Go 1.14 is the last release that will run on macOS 10.11 El Capitan.
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Go 1.15 will require macOS 10.12 Sierra or later.
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</p>
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<p><!-- golang.org/issue/34749 -->
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Go 1.14 is the last Go release to support 32-bit binaries on
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macOS (the <code>darwin/386</code> port). They are no longer
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supported by macOS, starting with macOS 10.15 (Catalina).
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Go continues to support the 64-bit <code>darwin/amd64</code> port.
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</p>
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<p><!-- golang.org/issue/34751 -->
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Go 1.14 will likely be the last Go release to support 32-bit
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binaries on iOS, iPadOS, watchOS, and tvOS
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(the <code>darwin/arm</code> port). Go continues to support the
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64-bit <code>darwin/arm64</code> port.
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</p>
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<h3 id="windows">Windows</h3>
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<p><!-- CL 203601 -->
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Go binaries on Windows now
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have <a href="https://docs.microsoft.com/en-us/windows/win32/memory/data-execution-prevention">DEP
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(Data Execution Prevention)</a> enabled.
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</p>
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<h3 id="wasm">WebAssembly</h3>
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<p><!-- CL 203600 -->
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JavaScript values referenced from Go via <code>js.Value</code>
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objects can now be garbage collected.
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</p>
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<p><!-- CL 203600 -->
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<code>js.Value</code> values can no longer be compared using
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the <code>==</code> operator, and instead must be compared using
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their <code>Equal</code> method.
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</p>
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<p><!-- CL 203600 -->
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<code>js.Value</code> now
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has <code>IsUndefined</code>, <code>IsNull</code>,
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and <code>IsNaN</code> methods.
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</p>
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<h3 id="riscv">RISC-V</h3>
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<p><!-- Issue 27532 -->
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Go 1.14 contains experimental support for 64-bit RISC-V on Linux
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(<code>GOOS=linux</code>, <code>GOARCH=riscv64</code>). Be aware
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that performance, assembly syntax stability, and possibly
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correctness are a work in progress.
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</p>
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<h3 id="freebsd">FreeBSD</h3>
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<p><!-- CL 199919 -->
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Go now supports the 64-bit ARM architecture on FreeBSD (the
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<code>freebsd/arm64</code> port).
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</p>
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<h3 id="nacl">Native Client (NaCl)</h3>
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<p><!-- golang.org/issue/30439 -->
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As <a href="go1.13#ports">announced</a> in the Go 1.13 release notes,
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Go 1.14 drops support for the Native Client platform (<code>GOOS=nacl</code>).
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</p>
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<p><!-- CL 203758 -->
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The runtime now respects zone CPU caps
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(the <code>zone.cpu-cap</code> resource control)
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for <code>runtime.NumCPU</code> and the default value
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of <code>GOMAXPROCS</code>.
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</p>
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<h2 id="tools">Tools</h2>
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<h3 id="go-command">Go command</h3>
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<h4 id="vendor">Vendoring</h4>
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<!-- golang.org/issue/33848 -->
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<p>
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When the main module contains a top-level <code>vendor</code> directory and
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its <code>go.mod</code> file specifies <code>go</code> <code>1.14</code> or
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higher, the <code>go</code> command now defaults to <code>-mod=vendor</code>
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for operations that accept that flag. A new value for that flag,
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<code>-mod=mod</code>, causes the <code>go</code> command to instead load
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modules from the module cache (as when no <code>vendor</code> directory is
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present).
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</p>
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<p>
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When <code>-mod=vendor</code> is set (explicitly or by default), the
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<code>go</code> command now verifies that the main module's
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<code>vendor/modules.txt</code> file is consistent with its
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<code>go.mod</code> file.
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</p>
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<p>
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<code>go</code> <code>list</code> <code>-m</code> no longer silently omits
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transitive dependencies that do not provide packages in
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the <code>vendor</code> directory. It now fails explicitly if
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<code>-mod=vendor</code> is set.
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</p>
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<h4 id="go-flags">Flags</h4>
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<p><!-- golang.org/issue/32502, golang.org/issue/30345 -->
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The <code>go</code> <code>get</code> command no longer accepts
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the <code>-mod</code> flag. Previously, the flag's setting either
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<a href="https://golang.org/issue/30345">was ignored</a> or
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<a href="https://golang.org/issue/32502">caused the build to fail</a>.
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</p>
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<p><!-- golang.org/issue/33326 -->
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<code>-mod=readonly</code> is now set by default when the <code>go.mod</code>
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file is read-only and no top-level <code>vendor</code> directory is present.
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</p>
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<p><!-- golang.org/issue/31481 -->
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<code>-modcacherw</code> is a new flag that instructs the <code>go</code>
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command to leave newly-created directories in the module cache at their
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default permissions rather than making them read-only.
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The use of this flag makes it more likely that tests or other tools will
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accidentally add files not included in the module's verified checksum.
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However, it allows the use of <code>rm</code> <code>-rf</code>
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(instead of <code>go</code> <code>clean</code> <code>-modcache</code>)
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to remove the module cache.
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</p>
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<p><!-- golang.org/issue/34506 -->
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<code>-modfile=file</code> is a new flag that instructs the <code>go</code>
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command to read (and possibly write) an alternate go.mod file instead of the
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one in the module root directory. A file named "go.mod" must still be present
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in order to determine the module root directory, but it is not
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accessed. When <code>-modfile</code> is specified, an alternate go.sum file
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is also used: its path is derived from the <code>-modfile</code> flag by
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trimming the ".mod" extension and appending ".sum".
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</p>
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<h4 id="go-env-vars">Environment variables</h4>
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<p><!-- golang.org/issue/32966 -->
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<code>GOINSECURE</code> is a new environment variable that instructs
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the <code>go</code> command to not require an HTTPS connection, and to skip
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certificate validation, when fetching certain modules directly from their
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origins. Like the existing <code>GOPRIVATE</code> variable, the value
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of <code>GOINSECURE</code> is a comma-separated list of glob patterns.
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</p>
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<h4 id="commands-outside-modules">Commands outside modules</h4>
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<p><!-- golang.org/issue/32027 -->
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When module-aware mode is enabled explicitly (by setting
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<code>GO111MODULE=on</code>), most module commands have more
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limited functionality if no <code>go.mod</code> file is present. For
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example, <code>go</code> <code>build</code>,
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<code>go</code> <code>run</code>, and other build commands can only build
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packages in the standard library and packages specified as <code>.go</code>
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files on the command line.
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</p>
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<p>
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Previously, the <code>go</code> command would resolve each package path
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to the latest version of a module but would not record the module path
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or version. This resulted in <a href="https://golang.org/issue/32027">slow,
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non-reproducible builds</a>.
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</p>
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<p>
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<code>go</code> <code>get</code> continues to work as before, as do
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<code>go</code> <code>mod</code> <code>download</code> and
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<code>go</code> <code>list</code> <code>-m</code> with explicit version
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patterns.
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</p>
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<h4 id="incompatible-versions"><code>+incompatible</code> versions</h4>
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<!-- golang.org/issue/34165 -->
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<p>
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If the latest version of a module contains a <code>go.mod</code> file,
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<code>go</code> <code>get</code> will no longer upgrade to an
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<a href="/cmd/go/#hdr-Module_compatibility_and_semantic_versioning">incompatible</a>
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major version of that module unless such a version is requested explicitly
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or is already required.
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<code>go</code> <code>list</code> also omits incompatible major versions
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for such a module when fetching directly from version control, but may
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include them if reported by a proxy.
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</p>
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<h4 id="go.mod"><code>go.mod</code> file maintenance</h4>
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<!-- golang.org/issue/34822 -->
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<p>
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<code>go</code> commands other than
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<code>go</code> <code>mod</code> <code>tidy</code> no longer
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remove a <code>require</code> directive that specifies a version of an indirect dependency
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that is already implied by other (transitive) dependencies of the main
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module.
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</p>
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<p>
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<code>go</code> commands other than
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<code>go</code> <code>mod</code> <code>tidy</code> no longer
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edit the <code>go.mod</code> file if the changes are only cosmetic.
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</p>
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<p>
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When <code>-mod=readonly</code> is set, <code>go</code> commands will no
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longer fail due to a missing <code>go</code> directive or erroneous
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<code>// indirect</code> comment.
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</p>
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<h4 id="module-downloading">Module downloading</h4>
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<p><!-- golang.org/issue/26092 -->
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The <code>go</code> command now supports Subversion repositories in module mode.
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</p>
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<p><!-- golang.org/issue/30748 -->
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The <code>go</code> command now includes snippets of plain-text error messages
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from module proxies and other HTTP servers.
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An error message will only be shown if it is valid UTF-8 and consists of only
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graphic characters and spaces.
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</p>
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<h4 id="go.mod">Testing</h4>
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<!-- golang.org/issue/24929 -->
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<p>
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<code>go test -v</code> now streams <code>t.Log</code> output as it happens,
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rather than at the end of all tests.
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</p>
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<h2 id="runtime">Runtime</h2>
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<p><!-- CL 190098 -->
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This release improves the performance of most uses
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of <code>defer</code> to incur almost zero overhead compared to
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calling the deferred function directly.
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As a result, <code>defer</code> can now be used in
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performance-critical code without overhead concerns.
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</p>
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<p><!-- CL 201760, CL 201762 and many others -->
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Goroutines are now asynchronously preemptible.
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As a result, loops without function calls no longer potentially
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deadlock the scheduler or significantly delay garbage collection.
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This is supported on all platforms except <code>windows/arm</code>,
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<code>darwin/arm</code>, <code>js/wasm</code>, and
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<code>plan9/*</code>.
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</p>
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<p>
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A consequence of the implementation of preemption is that on Unix
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systems, including Linux and macOS systems, programs built with Go
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1.14 will receive more signals than programs built with earlier
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releases.
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This means that programs that use packages
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like <a href="/pkg/syscall/"><code>syscall</code></a>
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or <a href="https://godoc.org/golang.org/x/sys/unix"><code>golang.org/x/sys/unix</code></a>
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will see more slow system calls fail with <code>EINTR</code> errors.
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Those programs will have to handle those errors in some way, most
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likely looping to try the system call again. For more
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information about this
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see <a href="http://man7.org/linux/man-pages/man7/signal.7.html"><code>man
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7 signal</code></a> for Linux systems or similar documentation for
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other systems.
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</p>
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<p><!-- CL 201765, CL 195701 and many others -->
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The page allocator is more efficient and incurs significantly less
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lock contention at high values of <code>GOMAXPROCS</code>.
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This is most noticeable as lower latency and higher throughput for
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large allocations being done in parallel and at a high rate.
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</p>
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<p><!-- CL 171844 and many others -->
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Internal timers, used by
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<a href="/pkg/time/#After"><code>time.After</code></a>,
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<a href="/pkg/time/#Tick"><code>time.Tick</code></a>,
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<a href="/pkg/net/#Conn"><code>net.Conn.SetDeadline</code></a>,
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and friends, are more efficient, with less lock contention and fewer
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context switches.
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This is a performance improvement that should not cause any user
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visible changes.
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</p>
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<!-- TODO: Maybe CL 200439? -->
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<h2 id="compiler">Compiler</h2>
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<p><!-- CL 162237 -->
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This release adds <code>-d=checkptr</code> as a compile-time option
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for adding instrumentation to check that Go code is following
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<code>unsafe.Pointer</code> safety rules dynamically.
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This option is enabled by default (except on Windows) with
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the <code>-race</code> or <code>-msan</code> flags, and can be
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disabled with <code>-gcflags=all=-d=checkptr=0</code>.
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Specifically, <code>-d=checkptr</code> checks the following:
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</p>
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<ol>
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<li>
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When converting <code>unsafe.Pointer</code> to <code>*T</code>,
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the resulting pointer must be aligned appropriately
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for <code>T</code>.
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</li>
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<li>
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If the result of pointer arithmetic points into a Go heap object,
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one of the <code>unsafe.Pointer</code>-typed operands must point
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into the same object.
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</li>
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</ol>
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<p>
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Using <code>-d=checkptr</code> is not currently recommended on
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Windows because it causes false alerts in the standard library.
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</p>
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<p><!-- CL 204338 -->
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The compiler can now emit machine-readable logs of key optimizations
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using the <code>-json</code> flag, including inlining, escape
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analysis, bounds-check elimination, and nil-check elimination
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</p>
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<p><!-- CL 196959 -->
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Detailed escape analysis diagnostics (<code>-m=2</code>) now work again.
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This had been dropped from the new escape analysis implementation in
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the previous release.
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</p>
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<p><!-- CL 196217 -->
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All Go symbols in macOS binaries now begin with an underscore,
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following platform conventions.
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</p>
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<p><!-- CL 202117 -->
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This release includes experimental support for compiler-inserted
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coverage instrumentation for fuzzing.
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See <a href="https://golang.org/issue/14565">the issue</a> for more
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details.
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This API may change in future releases.
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</p>
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<h2 id="library">Core library</h2>
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|
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<p>
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TODO
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</p>
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<dl id="hash/maphash"><dt><a href="/pkg/hash/maphash">hash/maphash</a></dt>
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<dd>
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<p><!-- CL 186877 -->
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TODO: <a href="https://golang.org/cl/186877">https://golang.org/cl/186877</a>: add hashing package for bytes and strings
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</p>
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</dl><!-- hash/maphash -->
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<dl id="crypto/tls"><dt><a href="/pkg/crypto/tls/">crypto/tls</a></dt>
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<dd>
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<p><!-- CL 191976 -->
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TODO: <a href="https://golang.org/cl/191976">https://golang.org/cl/191976</a>: remove SSLv3 support
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</p>
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<p><!-- CL 191999 -->
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TODO: <a href="https://golang.org/cl/191999">https://golang.org/cl/191999</a>: remove TLS 1.3 opt-out
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</p>
|
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<p><!-- CL 174329 -->
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The <code>tls</code> package no longer supports NPN and now only
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supports ALPN. In previous releases it supported both. There are
|
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no API changes and code should function identically as before.
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Most other clients & servers have already removed NPN support in
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favor of the standardized ALPN.
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</p>
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</dl><!-- crypto/tls -->
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<dl id="encoding/asn1"><dt><a href="/pkg/encoding/asn1/">encoding/asn1</a></dt>
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<dd>
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<p><!-- CL 126624 -->
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TODO: <a href="https://golang.org/cl/126624">https://golang.org/cl/126624</a>: handle ASN1's string type BMPString
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</p>
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</dl><!-- encoding/asn1 -->
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|
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<dl id="encoding/json"><dt><a href="/pkg/encoding/json/">encoding/json</a></dt>
|
|
<dd>
|
|
<p><!-- CL 200217 -->
|
|
<a href="/pkg/encoding/json/#Compact"><code>Compact</code></a> no longer
|
|
escapes the <code>U+2028</code> and <code>U+2029</code> characters, which
|
|
was never a documented feature. For proper escaping, see <a
|
|
href="/pkg/encoding/json/#HTMLEscape"><code>HTMLEscape</code></a>.
|
|
</p>
|
|
|
|
</dl><!-- encoding/json -->
|
|
|
|
<dl id="mime"><dt><a href="/pkg/mime/">mime</a></dt>
|
|
<dd>
|
|
<p><!-- CL 186927 -->
|
|
TODO: <a href="https://golang.org/cl/186927">https://golang.org/cl/186927</a>: update type of .js and .mjs files to text/javascript
|
|
</p>
|
|
|
|
</dl><!-- mime -->
|
|
|
|
<dl id="math"><dt><a href="/pkg/math/">math</a></dt>
|
|
<dd>
|
|
<p><!-- CL 127458 -->
|
|
The new <a href="/pkg/math/#FMA"><code>FMA</code></a> function
|
|
computes <code>x*y+z</code> in floating point with no
|
|
intermediate rounding of the <code>x*y</code>
|
|
computation. Several architectures implement this computation
|
|
using dedicated hardware instructions for additional performance.
|
|
</p>
|
|
|
|
</dl><!-- math -->
|
|
|
|
<dl id="math/big"><dt><a href="/pkg/math/big">math/big</a></dt>
|
|
<dd>
|
|
<p><!-- CL 164972 -->
|
|
The <a href="/pkg/math/big#GCD"><code>GCD</code></a> function
|
|
now allows the inputs <code>a</code> and <code>b</code> to be
|
|
zero or negative.
|
|
</p>
|
|
|
|
</dl><!-- math/big -->
|
|
|
|
<dl id="plugin"><dt><a href="/pkg/plugin/">plugin</a></dt>
|
|
<dd>
|
|
<p><!-- CL 191617 -->
|
|
The <code>plugin</code> package now supports <code>freebsd/amd64</code>.
|
|
</p>
|
|
|
|
</dl><!-- plugin -->
|
|
|
|
<dl id="reflect">
|
|
|
|
<dt><a href="/pkg/reflect/">reflect</a></dt>
|
|
<dd>
|
|
<p><!-- CL 85661 -->
|
|
<a href="/pkg/reflect#StructOf"><code>StructOf</code></a> now
|
|
supports creating struct types with unexported fields, by
|
|
setting the <code>PkgPath</code> field in
|
|
a <code>StructField</code> element.
|
|
</p>
|
|
|
|
</dl><!-- reflect -->
|
|
|
|
<dl id="runtime"><dt><a href="/pkg/runtime/">runtime</a></dt>
|
|
<dd>
|
|
<p><!-- CL 200081 -->
|
|
<code>runtime.Goexit</code> can no longer be aborted by a
|
|
recursive <code>panic</code>/<code>recover</code>.
|
|
</p>
|
|
|
|
<p><!-- CL 188297, CL 191785 -->
|
|
On macOS, <code>SIGPIPE</code> is no longer forwarded to signal
|
|
handlers installed before the Go runtime is initialized.
|
|
This is necessary because macOS delivers <code>SIGPIPE</code>
|
|
<a href="https://golang.org/issue/33384">to the main thread</a>
|
|
rather than the thread writing to the closed pipe.
|
|
</p>
|
|
|
|
</dl><!-- runtime -->
|
|
|
|
<dl id="signal"><dt><a href="/pkg/signal/">signal</a></dt>
|
|
<dd>
|
|
<p><!-- CL 187739 -->
|
|
On Windows,
|
|
the <code>CTRL_CLOSE_EVENT</code>, <code>CTRL_LOGOFF_EVENT</code>,
|
|
and <code>CTRL_SHUTDOWN_EVENT</code> events now generate
|
|
a <code>syscall.SIGTERM</code> signal, similar to how Control-C
|
|
and Control-Break generate a <code>syscall.SIGINT</code> signal.
|
|
</p>
|
|
|
|
</dl><!-- signal -->
|
|
|
|
<dl id="sync"><dt><a href="/pkg/sync/">sync</a></dt>
|
|
<dd>
|
|
<p><!-- CL 200577 -->
|
|
Unlocking a highly contended <code>Mutex</code> now directly
|
|
yields the CPU to the next goroutine waiting for
|
|
that <code>Mutex</code>. This significantly improves the
|
|
performance of highly contended mutexes on high CPU count
|
|
machines.
|
|
</p>
|
|
|
|
</dl><!-- sync -->
|
|
|
|
<dl id="testing"><dt><a href="/pkg/testing/">testing</a></dt>
|
|
<dd>
|
|
<p><!-- CL 201359 -->
|
|
The testing package now supports cleanup functions, called after
|
|
a test or benchmark has finished, by calling
|
|
<a href="/pkg/testing#T.Cleanup"><code>T.Cleanup</code></a> or
|
|
<a href="/pkg/testing#B.Cleanup"><code>B.Cleanup</code></a> respectively.
|
|
</p>
|
|
</dl><!-- testing -->
|
|
|
|
<h3 id="minor_library_changes">Minor changes to the library</h3>
|
|
|
|
<p>
|
|
As always, there are various minor changes and updates to the library,
|
|
made with the Go 1 <a href="/doc/go1compat">promise of compatibility</a>
|
|
in mind.
|
|
</p>
|
|
|
|
<p>
|
|
TODO
|
|
</p>
|