The Dragonfly libc returns a non-zero value for malloc(-1).

Fixes #17585.

Change-Id: Icfe68011ccbc75c676273ee3c3efdf24a520a004
Reviewed-on: https://go-review.googlesource.com/32050
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Reduces the size of LSym struct.

On 32bit: before 84  after 76
On 64bit: before 136 after 128

name       old time/op     new time/op     delta
Template       182ms ± 3%      182ms ± 3%    ~           (p=0.607 n=19+20)
Unicode       93.5ms ± 4%     94.2ms ± 3%    ~           (p=0.141 n=20+19)
GoTypes        608ms ± 1%      605ms ± 2%    ~           (p=0.056 n=20+20)

name       old user-ns/op  new user-ns/op  delta
Template        249M ± 7%       249M ± 4%    ~           (p=0.605 n=18+19)
Unicode         149M ±14%       151M ± 5%    ~           (p=0.724 n=20+17)
GoTypes         855M ± 4%       853M ± 3%    ~           (p=0.537 n=19+19)

name       old alloc/op    new alloc/op    delta
Template      40.3MB ± 0%     40.3MB ± 0%  -0.11%        (p=0.000 n=19+20)
Unicode       33.8MB ± 0%     33.8MB ± 0%  -0.08%        (p=0.000 n=20+20)
GoTypes        119MB ± 0%      119MB ± 0%  -0.10%        (p=0.000 n=19+20)

name       old allocs/op   new allocs/op   delta
Template        383k ± 0%       383k ± 0%    ~           (p=0.703 n=20+20)
Unicode         317k ± 0%       317k ± 0%    ~           (p=0.982 n=19+18)
GoTypes        1.14M ± 0%      1.14M ± 0%    ~           (p=0.086 n=20+20)

Change-Id: Id6ba0db3ecc4503a4e9af3ed0d5884d4366e8bf9
Reviewed-on: https://go-review.googlesource.com/31870Reviewed-by: David Crawshaw <crawshaw@golang.org>
Run-TryBot: Shahar Kohanim <skohanim@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

For historical reasons, the go/doc package does not include
the methods within an interface as part of the documented
methods for that type. Thus,

	go doc ast.Node.Pos

gives an incorrect and confusing error message:

	doc: no method Node.Pos in package go/ast

This CL does some dirty work to dig down to the methods
so interface methods now present their documentation:

% go doc ast.node.pos
func Pos() token.Pos  // position of first character belonging to the node
%

It must largely sidestep the doc package to do this, which
is a shame. Perhaps things will improve there one day.

The change does not handle embeddings, and in principle the
same approach could be done for struct fields, but that is also
not here yet. But this CL fixes the thing that was bugging me.

Change-Id: Ic10a91936da96f54ee0b2f4a4fe4a8c9b93a5b4a
Reviewed-on: https://go-review.googlesource.com/31852Reviewed-by: Robert Griesemer <gri@golang.org>

CL 31330 added more envvars to "go env".
This CL brings them to "go bug" as well.

Change-Id: Iae122072c8178007eda8b765aaa3f38c3c6e39a0
Reviewed-on: https://go-review.googlesource.com/32011
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Instead of generating typelink symbols in the compiler
mark types that should have typelinks with a flag.
The linker detects this flag and adds the marked types
to the typelink table.

name            old s/op    new s/op    delta
LinkCmdCompile   0.27 ± 6%   0.25 ± 6%  -6.93%    (p=0.000 n=97+98)
LinkCmdGo        0.30 ± 5%   0.29 ±10%  -4.22%    (p=0.000 n=97+99)

name            old MaxRSS  new MaxRSS  delta
LinkCmdCompile   112k ± 3%   106k ± 2%  -4.85%  (p=0.000 n=100+100)
LinkCmdGo        107k ± 3%   103k ± 3%  -3.00%  (p=0.000 n=100+100)

Change-Id: Ic95dd4b0101e90c1fa262c9c6c03a2028d6b3623
Reviewed-on: https://go-review.googlesource.com/31772
Run-TryBot: Shahar Kohanim <skohanim@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>

The condition to determine if any further iterations are needed is
evaluated to false in case it encounters a NaN. Instead, flip the
condition to keep looping until the factor is greater than the machine
roundoff error.

Updates #17577

Change-Id: I058abe73fcd49d3ae4e2f7b33020437cc8f290c3
Reviewed-on: https://go-review.googlesource.com/31952Reviewed-by: Robert Griesemer <gri@golang.org>

In sinit.go, gdata can already handle strings and complex, so no
reason to handle them separately.

In obj.go, inline gdatastring and gdatacomplex into gdata, since it's
the only caller. Allows extracting out the common Linksym calls.

Passes toolstash -cmp.

Change-Id: I3cb18d9b4206a8a269c36e0d30a345d8e6caba1f
Reviewed-on: https://go-review.googlesource.com/31498
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>

Fixes #17584.

Change-Id: I3af31cc1f2e9c906f3b73e77f3b092624ba78fbe
Reviewed-on: https://go-review.googlesource.com/31939
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>

Bug 15141 was apparently fixed by some other change to the
compiler (this is plausible, it was a weird bug dependent
on a particular way of returning a large named array result),
add the test to ensure that it stays fixed.

Updates #15141.

Change-Id: I3d6937556413fab1af31c5a1940e6931563ce2f3
Reviewed-on: https://go-review.googlesource.com/31972
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

No functional changes.

Change-Id: I0842b2560f4296abfc453410fdd79514132cab83
Reviewed-on: https://go-review.googlesource.com/31935
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

It no longer exists as of CL 31010.

Change-Id: Idd61f392544cad8b3f3f8d984dc5c953b473e2e5
Reviewed-on: https://go-review.googlesource.com/31934
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Some original shift opcodes for ppc64x expected an operand to be
a mask instead of a shift count, preventing some valid shift counts
from being written.

This adds new opcodes for shifts where needed, using mnemonics that
match the ppc64 asm and allowing the assembler to accept the full set
of valid shift counts.

Fixes #15016

Change-Id: Id573489f852038d06def279c13fd0523736878a7
Reviewed-on: https://go-review.googlesource.com/31853
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
Reviewed-by: David Chase <drchase@google.com>

Change-Id: Ie505b5d8cdfe4ffda71f909d6f81603b6d752eed
Reviewed-on: https://go-review.googlesource.com/31937
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: Ia499125714e272af87562de5e5d23e68a112df58
Reviewed-on: https://go-review.googlesource.com/31938
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

While we're here, use test[%d] in place of #%d.

Change-Id: Ie30afcab9673e78d3ea7ca80f5e662fbea897488
Reviewed-on: https://go-review.googlesource.com/31936
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Introduced in CLs 29380 and 30011.

Change-Id: I3d3641e8748ce0adb57b087a1fcd62f295ade665
Reviewed-on: https://go-review.googlesource.com/31933
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

Fixes #16811.

Change-Id: I7d018015f691838482ccf845d621209b96935ba4
Reviewed-on: https://go-review.googlesource.com/31657
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Quentin Smith <quentin@golang.org>

These are emulated by the assembler and we don't need them.

Change-Id: I2b07c5315a5b642fdb5e50b468453260ae121164
Reviewed-on: https://go-review.googlesource.com/31758Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Implements the following intrinsics on s390x:
 - AtomicAdd{32,64}
 - AtomicCompareAndSwap{32,64}
 - AtomicExchange{32,64}
 - AtomicLoad{32,64,Ptr}
 - AtomicStore{32,64,PtrNoWB}

I haven't added rules for And8 or Or8 yet.

Change-Id: I647af023a8e513718e90e98a60191e7af6167314
Reviewed-on: https://go-review.googlesource.com/31614
Run-TryBot: Michael Munday <munday@ca.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Apply the optimizations added to color conversion functions in
https://go-review.googlesource.com/#/c/21910/ to the RGBA methods.

YCbCrToRGBA/0-4      6.32ns ± 3%  6.58ns ± 2%   +4.15%  (p=0.000 n=20+19)
YCbCrToRGBA/128-4    8.02ns ± 2%  5.89ns ± 2%  -26.57%  (p=0.000 n=20+19)
YCbCrToRGBA/255-4    8.06ns ± 2%  6.59ns ± 3%  -18.18%  (p=0.000 n=20+20)
NYCbCrAToRGBA/0-4    8.71ns ± 2%  8.78ns ± 2%   +0.86%  (p=0.036 n=19+20)
NYCbCrAToRGBA/128-4  10.3ns ± 4%   7.9ns ± 2%  -23.44%  (p=0.000 n=20+20)
NYCbCrAToRGBA/255-4  9.64ns ± 2%  8.79ns ± 3%   -8.80%  (p=0.000 n=20+20)

Fixes: #15260

Change-Id: I225efdf74603e8d2b4f063054f7baee7a5029de6
Reviewed-on: https://go-review.googlesource.com/31773
Run-TryBot: Martin Möhrmann <martisch@uos.de>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Nigel Tao <nigeltao@golang.org>

name       old s/op    new s/op    delta
LinkCmdGo   0.29 ± 5%   0.29 ± 8%  -2.60%   (p=0.000 n=97+98)

name       old MaxRSS  new MaxRSS  delta
LinkCmdGo   106k ± 4%   105k ± 3%  -1.00%  (p=0.000 n=100+99)

Change-Id: I75a1c3b24ea711a15a5d2eae026b70b97ee7bad4
Reviewed-on: https://go-review.googlesource.com/31030
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>

Before go supported buildmode=shared ·f symbols used to be defined
only when they were used. In order to solve #11480 the strategy
was changed to have these symbols defined on declaration which is
less efficient and generates many unneeded symbols.
With this change the best strategy is chosen for each situation,
improving static linking time:

name            old s/op    new s/op    delta
LinkCmdCompile   0.27 ± 5%   0.25 ± 6%  -8.22%   (p=0.000 n=98+96)
LinkCmdGo        0.30 ± 6%   0.29 ± 8%  -5.03%   (p=0.000 n=95+99)

name            old MaxRSS  new MaxRSS  delta
LinkCmdCompile   107k ± 2%    98k ± 3%  -8.32%  (p=0.000 n=99+100)
LinkCmdGo        106k ± 3%   104k ± 3%  -1.94%  (p=0.000 n=99+100)

Change-Id: I965eeee30541e724fd363804adcd6fda10f965a4
Reviewed-on: https://go-review.googlesource.com/31031Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>

In general, these functions cannot behave correctly when given a
hostname, because a hostname may represent multiple IP addresses, and
first(isIPv4) chooses at most one.

Updates #9334

Change-Id: Icfb629f84af4d976476385a3071270253c0000b1
Reviewed-on: https://go-review.googlesource.com/31931Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Looking at the kernel sources, I don't see how this is possible.
But obviously it is. Just try again.

Fixes #17161.

Change-Id: Iea7d53f7cf75944792d2f75a0d07129831c7bcdb
Reviewed-on: https://go-review.googlesource.com/31823
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: If7740ac7b6c4190db5a1ab4100d12cf16dc79c84
Reviewed-on: https://go-review.googlesource.com/31768
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>

The old code leaves garbages in a temporary directory because it
cannot remove the current working directory on windows.
The new code changes the directory before calling os.Remove.

Furthermore, the old code assumes that ioutil.TempDir (os.TempDir)
doesn't return a relative path nor an UNC path.
If it isn't the case, the new code calls t.Fatal earlier for preventing
ambiguous errors.

Finally, the old code reassigns the variable which is used by the defer
function. It could cause unexpected results, so avoid that.

Change-Id: I5fc3902059ecaf18dc1341ecc4979d1206034cd7
Reviewed-on: https://go-review.googlesource.com/31790
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>

Updates #15345

Change-Id: I447d133512e99a9900928a910e161a85db6e8b75
Reviewed-on: https://go-review.googlesource.com/31792Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Change-Id: Ia86841cf84bc17ff6ecc6e5ac4cec86384a0da00
Reviewed-on: https://go-review.googlesource.com/31719Reviewed-by: Matthew Dempsky <mdempsky@google.com>

Requires -newparser=1.

For #17487.
For #16339.

Change-Id: I156fb0c0f8a97e8c72dbbfbd7fe821efee12b957
Reviewed-on: https://go-review.googlesource.com/31597Reviewed-by: Matthew Dempsky <mdempsky@google.com>

It appears to be a vestigial holding ground for bugs.
But we have an issue tracker, and #1909 is there and open.

Change-Id: I912ff222a24c51fab483be0c67dad534f5a84488
Reviewed-on: https://go-review.googlesource.com/31859Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

CL 31468 added TestLookupNonLDH, which was failing on Plan 9,
because LookupHost was expecting to return errNoSuchHost
on DNS resolution failure, while Plan 9 returned the
"dns failure" string.

In the Plan 9 implementation of lookupHost, we now return
errNoSuchHost instead of the "dns failure" string, so
the behavior is more consistant with other operating systems.

Fixes #17568.

Change-Id: If64f580dc0626a4a4f19e5511ba2ca5daff5f789
Reviewed-on: https://go-review.googlesource.com/31873
Run-TryBot: David du Colombier <0intro@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Fixes #15557

Change-Id: I02ad98068894e75d4e08e271fdd16cb420519460
Reviewed-on: https://go-review.googlesource.com/31910Reviewed-by: Andrew Gerrand <adg@golang.org>

Change-Id: If061f1f120573cb109d97fa40806e160603cd593
Reviewed-on: https://go-review.googlesource.com/31871Reviewed-by: Rob Pike <r@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

VerifyPeerCertificate returns an error if the peer should not be
trusted. It will be called after the initial handshake and before
any other verification checks on the cert or chain are performed.
This provides the callee an opportunity to augment the certificate
verification.

If VerifyPeerCertificate is not nil and returns an error,
then the handshake will fail.

Fixes #16363

Change-Id: I6a22f199f0e81b6f5d5f37c54d85ab878216bb22
Reviewed-on: https://go-review.googlesource.com/26654Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Fixes #17551.

Change-Id: I84b7d82654cda3559c119aa56b07f30d0d224865
Reviewed-on: https://go-review.googlesource.com/31857
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

This prevents the traceback code from seeing a half-updated
stack frame when a profiling signal comes during the execution
of function prologue. Also fixes mips64x part of #17381.

Change-Id: Iec9683427e546e3648b2e8b1dde956d13f6eb938
Reviewed-on: https://go-review.googlesource.com/31721
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>

Since CL 30614, TestCloseError is failing on Plan 9,
because File.Write now checks f.fd == badFd before
calling syscall.Write.

The f.fd == badFd check returns os.ErrClosed, while
syscall.Write returned a syscall.ErrorString error.

TestCloseError was failing because it expected a
syscall.ErrorString error.

We add a case in parseCloseError to handle the
os.ErrClosed case.

Fixes #17569.

Change-Id: I6b4d956d18ed6d3c2ac5211ffd50a4888f7521e1
Reviewed-on: https://go-review.googlesource.com/31872
Run-TryBot: David du Colombier <0intro@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

OREGISTER is unused.

All remaining uses of Node.Reg use REGSP.

Change-Id: I51cf06826867e576baabd568e04f96d2634f5cad
Reviewed-on: https://go-review.googlesource.com/31856
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

Crept into CL 9682, committed last week.

Change-Id: I5b8e9119dbfeb0bc3005623ab74dbd29311d17ae
Reviewed-on: https://go-review.googlesource.com/31814
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: I39a8b543e472e5ec5d4807a9b7f61657465c5ce5
Reviewed-on: https://go-review.googlesource.com/31816
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>