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doc/go1.13: runtime release notes, some compiler release notes

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Change-Id: Icc5083a3de0c6b737bfc20b573ed785651910148
Reviewed-on: https://go-review.googlesource.com/c/go/+/182461
Reviewed-by: Andrew Bonventre <andybons@golang.org>
This commit is contained in:
Austin Clements 2019-06-14 15:02:35 -04:00
parent 52572afa20
commit bd7d1bb8f3
1 changed files with 69 additions and 31 deletions
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@ -44,12 +44,26 @@ TODO
TODO
</p>
<p><!-- CL 158719 -->
TODO: <a href="https://golang.org/cl/158797">https://golang.org/cl/158797</a>: implement shifts by signed amounts
</p>
<h2 id="ports">Ports</h2>
<p>
TODO
</p>
<p><!-- CL 174457 -->
TODO: <a href="https://golang.org/cl/174457">https://golang.org/cl/174457</a>: add new GOOS=illumos, split out of GOOS=solaris
</p>
<h3 id="android">Android</h3>
<p><!-- CL 170127 -->
Go programs are now compatible with Android Q.
</p>
<h3 id="darwin">Darwin</h3>
<p>
@ -67,18 +81,64 @@ TODO
FreeBSD 12.0 or later requires a kernel with the COMPAT_FREEBSD11 option set (this is the default).
</p>
<h3 id="aix-ppc64">AIX on PPC64</h3>
<p><!-- CL 164003 -->
AIX on PPC64 now supports cgo and external linking.
</p>
<h2 id="tools">Tools</h2>
<p>
TODO
</p>
<h2 id="runtime">Runtime</h2>
<h3 id="compiler">Compiler toolchain</h3>
<p>
TODO
<p><!-- CL 170448 -->
The compiler has a new implementation of escape analysis that is
more precise. For most Go code should be an improvement (in other
words, more Go variables and expressions allocated on the stack
instead of heap). However, this increased precision may also break
invalid code that happened to work before (for example, code that
violates
the <a href="/pkg/unsafe/#Pointer"><code>unsafe.Pointer</code>
safety rules</a>). If you notice any regressions that appear
related, the old escape analysis pass can be re-enabled
with <code>go</code> <code>build</code> <code>-gcflags=all=-newescape=false</code>.
The option to use the old escape analysis will be removed in a
future release.
</p>
<p><!-- CL 161904 -->
The compiler no longer emits floating point or complex constants
to <code>go_asm.h</code> files. These have always been emitted in a
form that could not be used as numeric constant in assembly code.
</p>
<h2 id="runtime">Runtime</h2>
<p><!-- CL 161477 -->
Out of range panic messages now include the index that was out of
bounds and the length (or capacity) of the slice. For
example, <code>s[3]</code> on a slice of length 1 will panic with
"runtime error: index out of range [3] with length 1".
</p>
<p><!-- CL 171758 -->
This release improves performance of most uses of <code>defer</code>
by 30%.
</p>
<p><!-- CL 142960 -->
The runtime is now more aggressive at returning memory to the
operating system to make it available to co-tenant applications.
Previously, the runtime could retain memory for five or more minutes
following a spike in the heap size. It will now begin returning it
promptly after the heap shrinks. However, on many OSes, including
Linux, the OS itself reclaims memory lazily, so process RSS will not
decrease until the system is under memory pressure.
</p>
<h2 id="library">Core library</h2>
@ -105,9 +165,6 @@ TODO; link to <a href="/doc/go1.12#tls_1_3">Go 1.12 notes</a>.
TODO
</p>
<!-- CL 161904: https://golang.org/cl/161904: cmd/compile: do not export float or complex constants with -asmhdr -->
<!-- CL 170448: https://golang.org/cl/170448: cmd/compile: enable -newescape by default -->
<!-- CL 174125: https://golang.org/cl/174125: cmd/dist: add support for openbsd/arm64 -->
<!-- CL 177797: https://golang.org/cl/177797: cmd/doc: always print package clause except for commands -->
<!-- CL 173345: https://golang.org/cl/173345: cmd/go: add -trimpath build flag -->
@ -115,14 +172,6 @@ TODO
<!-- CL 175983: https://golang.org/cl/175983: cmd/go: set the "generate" build tag in go generate, per design doc -->
<!-- CL 167747: https://golang.org/cl/167747: 'go get' in module mode now supports the version suffix '@patch'.: cmd/go/internal/modget: support the suffix '@patch' in 'go get' -->
<dl id="all"><dt><a href="/pkg/all/">all</a></dt>
<dd>
<p><!-- CL 174457 -->
TODO: <a href="https://golang.org/cl/174457">https://golang.org/cl/174457</a>: add new GOOS=illumos, split out of GOOS=solaris
</p>
</dl><!-- all -->
<dl id="bytes"><dt><a href="/pkg/bytes/">bytes</a></dt>
<dd>
<p><!-- CL 161760 -->
@ -175,7 +224,12 @@ TODO
<dl id="debug/dwarf"><dt><a href="/pkg/debug/dwarf/">debug/dwarf</a></dt>
<dd>
<p><!-- CL 158797 -->
TODO: <a href="https://golang.org/cl/158797">https://golang.org/cl/158797</a>: more graceful handling of unsupported types
The <a href="/pkg/debug/dwarf/#Data.Type"><code>Data.Type</code></a>
method no longer panics if it encounters an unknown DWARF tag in
the type graph. Instead, it represents that component of the
type with
an <a href="/pkg/debug/dwarf/#UnsupportedType"><code>UnsupportedType</code></a>
object.
</p>
</dl><!-- debug/dwarf -->
@ -312,22 +366,6 @@ TODO
</dl><!-- runtime -->
<dl id="runtime, internal/poll, net"><dt><a href="/pkg/runtime, internal/poll, net/">runtime, internal/poll, net</a></dt>
<dd>
<p><!-- CL 166497 -->
TODO: <a href="https://golang.org/cl/166497">https://golang.org/cl/166497</a>: report event scanning error on read event
</p>
</dl><!-- runtime, internal/poll, net -->
<dl id="runtime/cgo"><dt><a href="/pkg/runtime/cgo/">runtime/cgo</a></dt>
<dd>
<p><!-- CL 170127 -->
TODO: <a href="https://golang.org/cl/170127">https://golang.org/cl/170127</a>: look for android_get_device_api_level in libc.so
</p>
</dl><!-- runtime/cgo -->
<dl id="strings"><dt><a href="/pkg/strings">strings</a></dt>
<dd>
<p><!-- CL 142003 -->