All goroutines decode into the same value.

LGTM=r
R=r, abursavich
CC=golang-codereviews
https://golang.org/cl/123930043

LGTM=iant
R=golang-codereviews, adg, iant
CC=golang-codereviews
https://golang.org/cl/122190043

as per rsc request

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/123970043

LGTM=adg, dave
R=golang-codereviews, adg, dave
CC=golang-codereviews
https://golang.org/cl/123050043

Current version of Getwd calls Stat that
calls Getwd therefore infinite recursion.

LGTM=minux
R=golang-codereviews, minux
CC=golang-codereviews
https://golang.org/cl/119600043

Fixes #8342.

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/122180043

Fixes #8314.

LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/125820043

Fixes #8181.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/123870043

According to the OpenBSD builder, it doesn't work.

TBR=bradfitz
CC=golang-codereviews
https://golang.org/cl/126830043

LGTM=rsc
R=rsc, khr
CC=golang-codereviews
https://golang.org/cl/121330043

CC=golang-codereviews
https://golang.org/cl/123950043

LGTM=dvyukov
R=golang-codereviews, dave, bradfitz, dvyukov, khr
CC=golang-codereviews
https://golang.org/cl/98510044

According to the FreeBSD builder, it doesn't work.

TBR=bradfitz
CC=golang-codereviews
https://golang.org/cl/121400043

C compiler does not support unnamed fields.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/124870043

The ast and printer don't care, and go/types can provide
a better error message.

This change requires an update to the tests for go/types
(go.tools repo). CL forthcoming.

Fixes #8493.

LGTM=adonovan
R=rsc, adonovan
CC=golang-codereviews
https://golang.org/cl/123010044

Some systems, like Ubuntu, pass --build-id when linking.  The
effect is to put a note in the output file.  This is not
useful when generating an object file with the -r option, as
it eventually causes multiple build ID notes in the final
executable, all but one of which are for tiny portions of the
file and are therefore useless.

Disable that by passing an explicit --build-id=none when
linking with -r on systems that might do this.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/119460043

LGTM=dvyukov
R=dvyukov, khr
CC=golang-codereviews
https://golang.org/cl/121030043

There are lots of internal synchronization in gob,
so it makes sense to have parallel benchmarks.
Also add a benchmark with slices and interfaces.

LGTM=r
R=golang-codereviews, r
CC=golang-codereviews
https://golang.org/cl/115960043

This lets us have non-main packages like cmd/internal or cmd/nm/internal/whatever.

The src/pkg migration (see golang.org/s/go14mainrepo) will allow this
as a natural side effect. The explicit change here just allows use of the
effect a little sooner.

LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/117630043

To do in another CL: make cmd/objdump use cmd/internal/objfile too.

There is a package placement decision in this CL:
cmd/internal/objfile instead of internal/objfile.
I chose to put internal under cmd to make clear (and enforce)
that no standard library packages should use this
(it's a bit dependency-heavy).

LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/123910043

Update #8314

TBR=r
R=golang-codereviews
CC=golang-codereviews
https://golang.org/cl/123890043

Eliminating use of this extension makes it easier to port the Go runtime
to other compilers. This CL also disables the extension in cc to prevent
accidental use.

LGTM=rsc, khr
R=rsc, aram, khr, dvyukov
CC=axwalk, golang-codereviews
https://golang.org/cl/106790044

This makes os.Getwd mimic C getwd on OS X,
and possibly other systems. The change on OS X
was a regression from 1.2 to 1.3.

Fixes #8400.

LGTM=bradfitz
R=iant, bradfitz
CC=golang-codereviews
https://golang.org/cl/118970043

LGTM=dave
R=golang-codereviews, dave
CC=golang-codereviews
https://golang.org/cl/123880043

benchmark                      old ns/op     new ns/op     delta
BenchmarkMalloc8               28.7          22.4          -21.95%
BenchmarkMalloc16              44.8          33.8          -24.55%
BenchmarkMallocTypeInfo8       49.0          32.9          -32.86%
BenchmarkMallocTypeInfo16      46.7          35.8          -23.34%
BenchmarkMallocLargeStruct     907           901           -0.66%
BenchmarkGobDecode             13235542      12036851      -9.06%
BenchmarkGobEncode             10639699      9539155       -10.34%
BenchmarkJSONEncode            25193036      21898922      -13.08%
BenchmarkJSONDecode            96104044      89464904      -6.91%

Fixes #8452.

LGTM=khr
R=golang-codereviews, bradfitz, rsc, dave, khr
CC=golang-codereviews
https://golang.org/cl/122090043

Fix few remaining cases after cl/117580043.

TBR=dfc
R=golang-codereviews
CC=dave, golang-codereviews
https://golang.org/cl/124850043

FlagNoGC is unused now.
FlagNoInvokeGC is unneeded as we don't invoke GC
on g0 and when holding locks anyway.
mal/malloc have very few uses and you never remember
the exact set of flags they use and the difference between them.
Moreover, eventually we need to give exact types to all allocations,
something what mal/malloc do not support.

LGTM=khr
R=golang-codereviews, khr
CC=golang-codereviews, rsc
https://golang.org/cl/117580043

Shrinkstack does not touch normal heap anymore,
so we can shink stacks concurrently with marking.

LGTM=khr
R=golang-codereviews, khr
CC=golang-codereviews, khr, rlh, rsc
https://golang.org/cl/122130043

Fixes #8403.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/123860043

LGTM=dan.kortschak, dave
R=dave, dan.kortschak
CC=golang-codereviews
https://golang.org/cl/121350043

TBR=gobot
R=golang-codereviews
CC=golang-codereviews
https://golang.org/cl/125790043

LGTM=minux
R=r, agl, minux
CC=golang-codereviews
https://golang.org/cl/121340043

LGTM=dave
R=golang-codereviews, dave
CC=golang-codereviews
https://golang.org/cl/126760043

LGTM=dave
R=golang-codereviews, dave
CC=golang-codereviews
https://golang.org/cl/122910043

Among other things, this allows users to match the decoded
pieces with the original XML, which can be necessary for
implementing standards like XML signatures.

Fixes #8484.

LGTM=bradfitz
R=bradfitz
CC=golang-codereviews
https://golang.org/cl/122960043

This fixes two problems: x/internal/y/z was using parent = x/internal/y instead of x,
and hasPathPrefix only looks at /, not \ for Windows.

LGTM=bradfitz
R=bradfitz
CC=golang-codereviews
https://golang.org/cl/121280045

LGTM=iant, bradfitz
R=bradfitz, iant
CC=golang-codereviews
https://golang.org/cl/120700043

Introduce the mFunction type to represent an mcall/onM-able function.
Name such functions using _m.

LGTM=bradfitz
R=bradfitz
CC=golang-codereviews
https://golang.org/cl/121320043

LGTM=rsc, khr
R=rsc, khr, bradfitz
CC=golang-codereviews
https://golang.org/cl/126720043

Hashing on the bytes instead of the words does
a (much) better job of using all the bits, so that
maps of floats have linear performance.

LGTM=khr
R=golang-codereviews, khr
CC=adonovan, golang-codereviews
https://golang.org/cl/126720044