The result of ODOTPTR, as well as a bunch of other ops,
should be the type of the result, not always a pointer type.

This fixes an amd64p32 bug where we were incorrectly truncating
a 64-bit slice index to 32 bits, and then barfing on a weird
load-64-bits-but-then-truncate-to-32-bits op that doesn't exist.

Fixes #15252

Change-Id: Ie62f4315fffd79f233e5449324ccc0879f5ac343
Reviewed-on: https://go-review.googlesource.com/22094
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

sync/atomic.StorePointer (which is implemented in
runtime/atomic_pointer.go) writes the pointer twice (through two
completely different code paths, no less). Fix it to only write once.

Change-Id: Id3b2aef9aa9081c2cf096833e001b93d3dd1f5da
Reviewed-on: https://go-review.googlesource.com/21999
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>

SwapPointer is declared as

  func SwapPointer(addr *unsafe.Pointer, new unsafe.Pointer) (old unsafe.Pointer)

in sync/atomic, but defined in the runtime (where it's actually
implemented) as

  func sync_atomic_SwapPointer(ptr unsafe.Pointer, new unsafe.Pointer) unsafe.Pointer

Make ptr a *unsafe.Pointer in the runtime definition to match the type
in sync/atomic.

Change-Id: I99bab651b995001bbe54f9e790fdef2417ef0e9e
Reviewed-on: https://go-review.googlesource.com/21998
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>

Use deBruijn sequences to count low-order zeros.
Reorg bswap to not use &^, it takes another instruction on x86.

Change-Id: I4a5ed9fd16ee6a279d88c067e8a2ba11de821156
Reviewed-on: https://go-review.googlesource.com/22084Reviewed-by: David Chase <drchase@google.com>

This code was fixed a while ago to ensure that xtest and fake packages came
first on the link line, but golang.org/cl/16775 added --whole-archive ...
--no-whole-archive around all the .a files and rendered this fix useless.

So, take a different approach and only put one .a file on the linker command
line for each ImportPath we see while traversing the action graph, not for each
*Package we see. The way we walk the graph ensures that we'll see the .a files
that need to be first first.

Change-Id: I137f00f129ccc9fc99f40eee885cc04cc358a62e
Reviewed-on: https://go-review.googlesource.com/21692Reviewed-by: Ian Lance Taylor <iant@golang.org>

The unique difficulty of #cgo pkg-config is that the linker flags are recorded
when the package is compiled but (obviously) must be used when the package is
linked into an executable -- so the flags need to be stored on disk somewhere.
As it happens cgo already writes out a _cgo_flags file: nothing uses it
currently, but this change adds it to the lib$pkg.a file when compiling a
package, reads it out when linking (and passes a version of the .a file with
_cgo_flags stripped out of it to the linker). It's all fairly ugly but it works
and I can't really think of any way of reducing the essential level of
ugliness.

Fixes #11739

Change-Id: I35621878014e1e107eda77a5b0b23d0240ec5750
Reviewed-on: https://go-review.googlesource.com/18790
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Notably, this fixes two incorrect argument sizes.

Update #11041

Change-Id: Ie4a3b1a59cd6a6707f6d2f4d3be978fc70322b46
Reviewed-on: https://go-review.googlesource.com/22091
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Update #14759.

Change-Id: I8a174aad721beb62380e10071d9648b6b1c21b8c
Reviewed-on: https://go-review.googlesource.com/22072
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>

This ensures that importpath symbols are treated like other type data
and end up in the same section under all build modes.

Fixes: go test -buildmode=pie reflect

Change-Id: Ibb8348648e8dcc850f2424d206990a06090ce4c6
Reviewed-on: https://go-review.googlesource.com/22081
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

While we’re here, clean up a few comments.

Fixes #15281

Change-Id: Ia6173e9941133db08f57bc80bdd3c5722122bfdb
Reviewed-on: https://go-review.googlesource.com/22082
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>

Print numGC followed by numGC1, rather than printing numGC twice.

Change-Id: I8e7144b6a11d4ae9be0d82d88b86fed04b906e2f
Reviewed-on: https://go-review.googlesource.com/22087Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

These comments were left behind after runtime.h was converted
from C to Go. I examined the original code and tried to move these
to the places that the most sense.

Change-Id: I8769d60234c0113d682f9de3bd8d6c34c450c188
Reviewed-on: https://go-review.googlesource.com/21969Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

s390x can handle unaligned loads and stores of 64-bit values.

Change-Id: Iae5621781e3ba56e27b4a1f4788772c86e4f6475
Reviewed-on: https://go-review.googlesource.com/22086Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

This is a fix for the ssacheck builder
http://build.golang.org/log/baa00f70c34e41186051cfe90568de3d91f115d7
after CL 21307 for sinking spills down loop exits
https://go-review.googlesource.com/#/c/21037/

The fix is to reuse (move) the original spill, thus preserving
the definition of the variable and its use count. Original and
copy both use the same stack slot, but ssacheck needs to see
a definition for the variable itself.

Fixes #15279.

Change-Id: I286285490193dc211b312d64dbc5a54867730bd6
Reviewed-on: https://go-review.googlesource.com/21995Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

+ test

Fixes #15305

Change-Id: Ica657c00c92f0b19f0df7452cdbe5a95d23cc8a4
Reviewed-on: https://go-review.googlesource.com/22085Reviewed-by: Robert Griesemer <gri@golang.org>

Fixes #15271

Change-Id: I28e3fb5bde1e6fd5b263b1434873b8ce051aee97
Reviewed-on: https://go-review.googlesource.com/22083
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>

Also add MustClose and MustWriter to cmd/internal/bio, and use them in
cmd/asm.

Change-Id: I07f5df3b66c17bc5b2e6ec9c4357d9b653e354e0
Reviewed-on: https://go-review.googlesource.com/21938
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

The AuthorityKeyId is optional for self-signed certificates, generally
useless, and takes up space. This change causes an AuthorityKeyId not to
be added to self-signed certificates, although it can still be set in
the template if the caller really wants to include it.

Fixes #15194.

Change-Id: If5d3c3d9ca9ae5fe67458291510ec7140829756e
Reviewed-on: https://go-review.googlesource.com/21895Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Adam Langley <agl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Error strings in this package were all over the place: some were
prefixed with “tls:”, some with “crypto/tls:” and some didn't have a
prefix.

This change makes everything use the prefix “tls:”.

Change-Id: Ie8b073c897764b691140412ecd6613da8c4e33a2
Reviewed-on: https://go-review.googlesource.com/21893Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>

We can trust that untyped composite literals are part of a slice literal
and not emit a vet warning for those.

Fixes #9171

Change-Id: Ia7c081e543b850f8be1fd1f9e711520061e70bed
Reviewed-on: https://go-review.googlesource.com/22000
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>

The old trace-viewer is broken since Chrome 49:
https://bugs.chromium.org/p/chromium/issues/detail?id=569417
It was fixed in:
https://github.com/catapult-project/catapult/commit/506457cbd726324f327b80ae11f46c1dfeb8710d

This change updates trace-viewer to the latest version
(now it is called catapult).

This version has a bug in the lean config that we use, though:
https://github.com/catapult-project/catapult/issues/2247
So use full config for now (it works, but leads to larger html).
When the bug is fixed we need to switch back to lean config (issue #15302).

Change-Id: Ifb8d782ced66e3292d81c5604039fe18eaf267c5
Reviewed-on: https://go-review.googlesource.com/22013Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

The synchronization in this test is a bit complicated and likely
incorrect, judging from the sporadically hanging trybots.
Most of what this is supposed to test is already tested in
TestTestContext, so I'll just remove it.

Fixes #15170

Change-Id: If54db977503caa109cec4516974eda9191051888
Reviewed-on: https://go-review.googlesource.com/22080
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Fixes #15291.

Change-Id: I563140c2acd37d4989a940488b217414cf73f6c2
Reviewed-on: https://go-review.googlesource.com/22077Reviewed-by: Alex Brainman <alex.brainman@gmail.com>

Change-Id: I6644081df495cb92b3d208f867066f9acb08946f
Reviewed-on: https://go-review.googlesource.com/22074
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: I41691134770d01805c19c0f84f8828b00b85de0c
Reviewed-on: https://go-review.googlesource.com/22058
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Change-Id: I9bda2ce6f45fb8292503f86d8f9f161601f222b7
Reviewed-on: https://go-review.googlesource.com/22053Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>

Some of the Debug[x] flags are actually boolean too, but not all, so
they need to be handled separately.

While here, change some obj.Flagstr and obj.Flagint64 calls to
directly use flag.StringVar and flag.Int64Var instead.

Change-Id: Iccedf6fed4328240ee2257f57fe6d66688f237c4
Reviewed-on: https://go-review.googlesource.com/22052Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>

Tested with debugFormat enabled and running
(export GO_GCFLAGS=-newexport; sh all.bash).

Change-Id: If7d43e1e594ea43c644232b89e670f7abb6b003e
Reviewed-on: https://go-review.googlesource.com/22033Reviewed-by: Matthew Dempsky <mdempsky@google.com>

Documentation change only.

Fixes #15178.

Change-Id: I3c7d80ce9e668ac7515f7ebb9da80f3bd8e534d6
Reviewed-on: https://go-review.googlesource.com/22006Reviewed-by: Ian Lance Taylor <iant@golang.org>

Also:
- "rewrite" node Op in exporter for some nodes instead of importer
- more comments

Change-Id: I809e6754d14987b28f1da9379951ffa2e690c2a7
Reviewed-on: https://go-review.googlesource.com/22008Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

The existing epoll_event structure used by many of
the epoll_* syscalls was defined incorrectly
for use with ppc64le & ppc64 in the syscall
directory.  This resulted in the caller getting
incorrect information on return from these
syscalls.  This caused failures in fsnotify as
well as builds with upstream Docker.  The
structure is defined correctly in gccgo.

This adds a pad field that is expected for
these syscalls on ppc64le, ppc64.
Fixes #15135

Change-Id: If7e8ea9eb1d1ca5182c8dc0f935b334127341ffd
Reviewed-on: https://go-review.googlesource.com/21582Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>

By replacing the *string used to represent pkgPath with a
reflect.name everywhere, the embedded *string for package paths
inside the reflect.name can be replaced by an offset, nameOff.
This reduces the number of pointers in the type information.

This also moves all reflect.name types into the same section, making
it possible to use nameOff more widely in later CLs.

No significant binary size change for normal binaries, but:

linux/amd64 PIE:
	cmd/go: -440KB (3.7%)
	jujud:  -2.6MB (3.2%)

For #6853.

Change-Id: I3890b132a784a1090b1b72b32febfe0bea77eaee
Reviewed-on: https://go-review.googlesource.com/21395
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: If0e0bc5a85101db1e70faaab168fc2d12024eb93
Reviewed-on: https://go-review.googlesource.com/22005Reviewed-by: Ian Lance Taylor <iant@golang.org>

Merge them together into os1_darwin.go. A future CL will rename it.

Change-Id: Ia4380d3296ebd5ce210908ce3582ff184566f692
Reviewed-on: https://go-review.googlesource.com/22004
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Fixes #15104.

Change-Id: I9ddfbbf39ef0a873b703ee3e04fbb7d1192f5f39
Reviewed-on: https://go-review.googlesource.com/21581
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

We do two O(n) scans of all values in an eqclass when computing
substitutions for CSE.

In unfortunate cases, like those found in #15112, we can have a large
eqclass composed of values found in blocks none of whom dominate the
other.  This leads to O(n^2) behavior. The elements are removed one at a
time, with O(n) scans each time.

This CL removes the linear scan by sorting the eqclass so that dominant
values will be sorted first.  As long as we also ensure we don't disturb
the sort order, then we no longer need to scan for the maximally
dominant value.

For the code in issue #15112:

Before:
real    1m26.094s
user    1m30.776s
sys     0m1.125s

Aefter:
real    0m52.099s
user    0m56.829s
sys     0m1.092s

Updates #15112

Change-Id: Ic4f8680ed172e716232436d31963209c146ef850
Reviewed-on: https://go-review.googlesource.com/21981Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Todd Neal <todd@tneal.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Make it clear that the point of this function stores a pointer
*without* a write barrier.

sed -i -e 's/Storep1/StorepNoWB/' $(git grep -l Storep1)

Updates #15270.

Change-Id: Ifad7e17815e51a738070655fe3b178afdadaecf6
Reviewed-on: https://go-review.googlesource.com/21994Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>

Go runtime never emits PCs that are not a return address
(except for cpu profiler).

Change-Id: I08d9dc5c7c71e23f34f2f0c16f8baeeb4f64fcd6
Reviewed-on: https://go-review.googlesource.com/21735Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: Ic7a1fb0dbbf108052c970a4a830269a5673df7df
Reviewed-on: https://go-review.googlesource.com/21963Reviewed-by: Matthew Dempsky <mdempsky@google.com>

Instead of indicating with each function signature if it has an inlineable
body, collect all functions in order and export function bodies with function
index in platform-specific section.

Moves this compiler specific information out of the platform-independent
export data section, and removes an int value for all functions w/o body.
Also simplifies the code a bit.

Change-Id: I8b2d7299dbe81f2706be49ecfb9d9f7da85fd854
Reviewed-on: https://go-review.googlesource.com/21939Reviewed-by: Matthew Dempsky <mdempsky@google.com>