Now the only difference between dev.cc and dev.garbage
is the runtime conversion on the one side and the
garbage collection on the other. They both have the
same set of changes from default and dev.power64.

LGTM=austin
R=austin
CC=golang-codereviews
https://golang.org/cl/172570043

This is the revision that dev.cc is branched from.

LGTM=austin
R=austin
CC=golang-codereviews
https://golang.org/cl/169590043

This adds registerization support to 9g equivalent to what the
other compilers have.

LGTM=rsc
R=rsc, dave
CC=golang-codereviews
https://golang.org/cl/174980043

None of the other compilers have a tag for this enum.
Cleaning all of this up to use proper types will happen after
the conversion.

LGTM=minux, rsc
R=rsc, minux
CC=golang-codereviews
https://golang.org/cl/166690043

Previously, the 6g and 8g registerizers scanned for used
registers beyond the end of a region being considered for
registerization.  This ancient artifact was copied from the C
compilers, where it was probably necessary to track implicitly
used registers.  In the Go compilers it's harmless (because it
can only over-restrict the set of available registers), but no
longer necessary because the Go compilers correctly track
register use/set information.  The consequences of this extra
scan were (at least) that 1) we would not consider allocating
the AX register if there was a deferproc call in the future
because deferproc uses AX as a return register, so we see the
use of AX, but don't track that AX is set by the CALL, and 2)
we could not consider allocating the DX register if there was
a MUL in the future because MUL implicitly sets DX and (thanks
to an abuse of copyu in this code) we would also consider DX
used.

This commit fixes these problems by nuking this code.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/174110043

LGTM=dave, rsc
R=rsc, dave
CC=golang-codereviews
https://golang.org/cl/169460043

For D_OREG addresses, store the used registers in regindex
instead of reguse because they're really part of addressing.

Add implicit register use/set for DUFFZERO/DUFFCOPY.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/174050044

Also improve missing GC mark diagnostics.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/169450043

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/174970043

Add missing write barrier when initializing state
for newly created goroutine. Add write barrier for
same slot when preempting a goroutine.

Disable write barrier during goroutine death,
because dopanic does pointer writes.

With concurrent mark enabled (not in this CL), all.bash passed once.
The second time, TestGoexitCrash-2 failed.

LGTM=rlh
R=rlh
CC=golang-codereviews
https://golang.org/cl/167610043

Also rewrite some casp that don't use real pointers
to use casuintptr instead.

LGTM=rlh
R=rlh
CC=golang-codereviews
https://golang.org/cl/166440044

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/174820043

To turn concurrent gc on alter the if false in func gogc
currently at line 489 in malloc.go

LGTM=rsc
R=rsc
CC=golang-codereviews, rlh
https://golang.org/cl/172190043

Disable linkx_run.go and sinit_run.go, because they
exec subprocesses, which NaCl cannot.

TBR=r
CC=golang-codereviews
https://golang.org/cl/171350043

Follow-up in response to comments on
TBR'ed CL 171260043.

LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/172080043

Manifested as increased memory usage in a Google production system.

Not an unbounded leak, but can significantly increase the number
of sudogs allocated between garbage collections.

I checked all the other calls to acquireSudog.
This is the only one that was missing a releaseSudog.

LGTM=r, dneil
R=dneil, r
CC=golang-codereviews
https://golang.org/cl/169260043

These are being built into the runtime/cgo for every
operating system. It doesn't seem to matter, but
restore the Go 1.3 behavior anyway.

LGTM=r
R=r, dave
CC=golang-codereviews
https://golang.org/cl/171290043

LGTM=dave, bradfitz, r, alex.brainman
R=r, dave, bradfitz, alex.brainman
CC=golang-codereviews
https://golang.org/cl/167350043

LGTM=bradfitz, r
R=r, bradfitz
CC=golang-codereviews
https://golang.org/cl/168320043

This was a mistake. The cmd/api tool
depends on an old version of go/types.

««« original CL description
cmd/api: use golang.org/x/... import paths

LGTM=bradfitz, rsc
R=rsc, bradfitz
CC=golang-codereviews
https://golang.org/cl/169000043
»»»

TBR=rsc, bradfitz
R=bradfitz, rsc
CC=golang-codereviews
https://golang.org/cl/169320043

This was a mistake; the cmd/api tool
depends on an old version of go/types.

««« original CL description
cmd/api: bump go.tools golden CL hash

TBR=bradfitz
R=rsc
CC=golang-codereviews
https://golang.org/cl/166380043
»»»

TBR=bradfitz, rsc
R=bradfitz, rsc
CC=golang-codereviews
https://golang.org/cl/167430043

TBR=bradfitz
R=rsc
CC=golang-codereviews
https://golang.org/cl/166380043

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/168170043

LGTM=rsc, r
R=r, rsc
CC=golang-codereview, golang-codereviews
https://golang.org/cl/168050043

LGTM=bradfitz, rsc
R=rsc, bradfitz
CC=golang-codereviews
https://golang.org/cl/169000043

I've Mercurial version 3.2 and hg submit fails with:

  File "/home/agl/devel/go/lib/codereview/codereview.py", line 3567, in get_hg_status
    ret = hg_commands.status(fui, self.repo, *[], **{'rev': [rev], 'copies': True})
  File "/usr/lib/python2.7/site-packages/mercurial/commands.py", line 5714, in status
    fm = ui.formatter('status', opts)
  File "/home/agl/devel/go/lib/codereview/codereview.py", line 3464, in formatter
    return plainformatter(self, topic, opts)
  File "/usr/lib/python2.7/site-packages/mercurial/formatter.py", line 57, in __init__
    if ui.debugflag:
  AttributeError: 'FakeMercurialUI' object has no attribute 'debugflag'

This change dumbly adds a boolean debugflag and that seems to work.

LGTM=minux
R=rsc, minux
CC=golang-codereviews
https://golang.org/cl/167410043

New detection because of net/http now using TestMain.

Fixes #9033

LGTM=iant
R=golang-codereviews, iant
CC=adg, golang-codereviews, rsc
https://golang.org/cl/170210043

Fixes #9065.

LGTM=rsc
R=rsc, misch
CC=golang-codereviews
https://golang.org/cl/171270043

Replace a bit-wise AND with a logical one.  This happened to
work before because bany returns 0 or 1, but the intent here
is clearly logical (and this makes 5g match with 6g and 8g).

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/172850043

This was missing from CL 167320043.
Happy to apply comments in a followup.
TBR to fix build.

TBR=r
CC=golang-codereviews
https://golang.org/cl/171260043

Moving so that new Go 1.4 pprof can use it.

The old 'GNU objdump workalike' mode for 'go tool objdump'
is now gone, as are the tests for that mode. It was used only
by pre-Go 1.4 pprof. You can still specify an address range on
the command line; you just get the same output format as
you do when dumping the entire binary (without an address
limitation).

LGTM=r
R=r
CC=golang-codereviews, iant
https://golang.org/cl/167320043

For OITAB nodes, 5g's naddr was setting the wrong etype and
failing to set the width of the resulting Addr.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/171220043

LGTM=r
R=khr, r
CC=golang-codereviews
https://golang.org/cl/165590043

People viewing this locally will not have a /s/ on their local godoc.
tip.golang.org doesn't have one either.

Also change all golang.org links to https, to avoid mixed content
warnings when viewing https://golang.org/.

Fixes #9028.

LGTM=bradfitz, r
R=r, bradfitz
CC=adg, golang-codereviews
https://golang.org/cl/168250043

The remaining run-only tests will be migrated to run.go in another CL.

This CL will break the build due to issues 8746 and 8806.

Update #4139
Update #8746
Update #8806

LGTM=rsc
R=rsc, bradfitz, iant
CC=golang-codereviews
https://golang.org/cl/144630044

9g's naddr was missing assignments to a->width in several
cases, so the optimizer was getting bogus width information.
Add them.

This correct width information also lets us enable the width
check in gins for MOV*.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/167310043

The etype of references to strings was being incorrectly set
to TINT32 on all platforms.  Change it to TSTRING.  It seems
this doesn't matter for compilation, since x86 uses LEA
instructions to load string addresses and arm and power64
disassemble the string into its constituent pieces (with the
correct types), but it helps when debugging.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/170100043

Stack bitmaps need to be scanned past any BitsDead entries.

Object bitmaps will not have any BitsDead in them (bitmap extraction stops at
the first BitsDead entry in makeheapobjbv).  data/bss bitmaps also have no BitsDead entries.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/168270043

CL 170720043 missed this one when adding +PCQuantum.

LGTM=iant
R=r, iant
CC=golang-codereviews
https://golang.org/cl/168090043

Fixes #9046.

LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/162680043