Fixes #9776

Change-Id: I53741fd970244bbfa6874adcb4f1e3d0e7de386b
Reviewed-on: https://go-review.googlesource.com/4162Reviewed-by: Andrew Gerrand <adg@golang.org>

Before, an array of size 4 would always be allocated even if a tag
doesn't have any attributes. Now that array is allocated only if
needed.

benchmark              old allocs     new allocs     delta
BenchmarkUnmarshal     191            176            -8.5%

Change-Id: I4d214b228883d0a6e892c0d6eb00dfe2da84c116
Reviewed-on: https://go-review.googlesource.com/4160Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Fixes #8780

Change-Id: I09cf01ff9722eed49086992a12774f2de81d16f2
Reviewed-on: https://go-review.googlesource.com/2840Reviewed-by: Andrew Gerrand <adg@golang.org>

warning: src/liblink/list5.c:171 format mismatch lld INT, arg 4
warning: src/liblink/list9.c:175 format mismatch lld INT, arg 4
warning: src/liblink/list6.c:211 format mismatch lld INT, arg 4
warning: src/liblink/list8.c:205 format mismatch lld INT, arg 4

Change-Id: I745ea852d8b58ecbbd32723e2a67aa784a729ff8
Reviewed-on: https://go-review.googlesource.com/4112Reviewed-by: Minux Ma <minux@golang.org>

The old C-based dist accepted merged flags (-wp) but the Go-based dist
requires -w -p

This should get the Windows race builder running properly, along with
https://go-review.googlesource.com/#/c/4132/

Update #8640

Change-Id: Ic17bbe9ea6c8b3d3e9b29f94e234d014f2926439
Reviewed-on: https://go-review.googlesource.com/4133Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

This change is an implementation of the signal
runtime and os/signal package on Plan 9.

Contrary to Unix, on Plan 9 a signal is called
a note and is represented by a string.

For this reason, the sigsend and signal_recv
functions had to be reimplemented specifically
for Plan 9.

In order to reuse most of the code and internal
interface of the os/signal package, the note
strings are mapped to integers.

Thanks to Russ Cox for the early review.

Change-Id: I95836645efe21942bb1939f43f87fb3c0eaaef1a
Reviewed-on: https://go-review.googlesource.com/2164Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Rob Pike <r@golang.org>

It turns out -iex argument is not supported by all gdb versions,
but as we need to add the auto-load safe path before loading the
inferior, test -iex support first and skip the test if it's not
available.

We should still update our builders though.

Change-Id: I355697de51baf12162ba6cb82f389dad93f93dc5
Reviewed-on: https://go-review.googlesource.com/4070Reviewed-by: Ian Lance Taylor <iant@golang.org>

On some systems, gdb refuses to load Python plugin from arbitrary
paths, so we have to add $GOROOT/src/runtime to auto-load-safe-path
in the gdb script test.

Change-Id: Icc44baab8d04a65bd21ceac2ab8ddb13c8d083e8
Reviewed-on: https://go-review.googlesource.com/2905Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>

Ideally, those methods should return a copy of the Addr, but
due to the Go 1 API guarantee, we cannot make that change now:
there might exist client code that uses the returned Addr as
map index and thus relies on the fact that different invocation
of the method returns the same pointer. Changing this behavior
will lead to hidden behaviour change in those programs.

Update #9654.

Change-Id: Iad4235f2ed7789b3a3c8e0993b9718cf0534ea2b
Reviewed-on: https://go-review.googlesource.com/3851Reviewed-by: Mikio Hara <mikioh.mikioh@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Ordinary switch statements are rewritten
into a sequence of if statements.
Staticly dead cases were not being eliminated
because the rewrite introduced a temporary,
which hid the fact that the case was a constant.
Stop doing that.

This eliminates dead code in the standard library at:

runtime/cgocall.go:219
runtime/cgocall.go:269
debug/gosym/pclntab.go:175
debug/macho/file.go:208
math/big/nat.go:635
math/big/nat.go:850
math/big/nat.go:1058
cmd/pprof/internal/commands/commands.go:86
net/sock_bsd.go:19
cmd/go/build.go:2657
cmd/go/env.go:90

Fixes #9608.

Change-Id: Ic23a05dfbb1ad91d5f62a6506b35a13e51b33e38
Reviewed-on: https://go-review.googlesource.com/3980Reviewed-by: Keith Randall <khr@golang.org>

eqstring does not need to check the length of the strings.
Other architectures were done in a separate commit.

While we're here, add a pointer equality check.

Change-Id: Id2c8616a03a7da7037c1e9ccd56a549fc952bd98
Reviewed-on: https://go-review.googlesource.com/3956Reviewed-by: Keith Randall <khr@golang.org>

eqstring does not need to check the length of the strings.

6g

benchmark                              old ns/op     new ns/op     delta
BenchmarkCompareStringEqual            7.03          6.14          -12.66%
BenchmarkCompareStringIdentical        3.36          3.04          -9.52%

5g

benchmark                                 old ns/op     new ns/op     delta
BenchmarkCompareStringEqual               238           232           -2.52%
BenchmarkCompareStringIdentical           90.8          80.7          -11.12%

The equivalent PPC changes are in a separate commit
because I don't have the hardware to test them.

Change-Id: I292874324b9bbd9d24f57a390cfff8b550cdd53c
Reviewed-on: https://go-review.googlesource.com/3955Reviewed-by: Keith Randall <khr@golang.org>

- clarified representation of +/-Inf
- only 0 and Inf values can have 0 precision
- a zero precision value used as result value takes the max precision
  of the arguments (to be fine-tuned for setters)
- the zero precision approach makes Float zero values possible
  (they represent +0)
- more tests

Missing: Filling in the blanks. More tests.

Change-Id: Ibb4f97e12e1f356c3085ce80f3464e97b82ac130
Reviewed-on: https://go-review.googlesource.com/4000Reviewed-by: Alan Donovan <adonovan@google.com>

Only documentation / comment changes. Update references to
point to golang.org permalinks or go.googlesource.com/go.
References in historical release notes under doc are left as is.

Change-Id: Icfc14e4998723e2c2d48f9877a91c5abef6794ea
Reviewed-on: https://go-review.googlesource.com/4060Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: I40feb9e65615a0f683cfc3f54e0c0cfabcf6a787
Reviewed-on: https://go-review.googlesource.com/4010Reviewed-by: Minux Ma <minux@golang.org>

And the silence of the git-codereview.

Change-Id: If3f7fe2de2ab4c1756f3cef8267199049d468b31
Reviewed-on: https://go-review.googlesource.com/3983Reviewed-by: Minux Ma <minux@golang.org>

Fixes #837.

Change-Id: I2d601504addbd220b304d32d587144d2a702f753
Reviewed-on: https://go-review.googlesource.com/2127Reviewed-by: David Crawshaw <crawshaw@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>

cmd/dist: recognize darwin/arm as (host) goos/goarches. also hard
          code GOARM=7 for darwin/arm.
make.bash: don't pass -mmacosx-version-min=10.6 when building for
           darwin/arm.

Change-Id: If0ecd84a5179cd9bb61b801ac1899adc45f12f75
Reviewed-on: https://go-review.googlesource.com/2126Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>

On Darwin/ARM, because libSystem doesn't provide functions for
__sync_fetch_and_add, and only clang can inline that function,
skip the test when building with GCC.

Change-Id: Id5e9d8f9bbe1e6bcb2f381f0f66cf68aa95277c7
Reviewed-on: https://go-review.googlesource.com/2125Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: I936be12eed95b99d1d20ed16fb785182e1817b33
Reviewed-on: https://go-review.googlesource.com/2124Reviewed-by: David Crawshaw <crawshaw@golang.org>

Change-Id: Id6f7fa12084204bc3a200f423c7966ce2a0b63a0
Reviewed-on: https://go-review.googlesource.com/2123Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>

Change-Id: I213a8ab0b8c027a7b73567aeefdca73fd10eae28
Reviewed-on: https://go-review.googlesource.com/2122Reviewed-by: David Crawshaw <crawshaw@golang.org>

Change-Id: I63110daad2d62ae72ab1f33a40464d76e6205627
Reviewed-on: https://go-review.googlesource.com/2121Reviewed-by: David Crawshaw <crawshaw@golang.org>

liblink:
 - set dummy value for ctxt->tlsoffset.
cmd/ld:
 - always do external linking when using cgo on darwin/arm,
   as our linker might not generate codesign-compatible binary.
cmd/5l:
 - support generate ARM Mach-O binaries
 - add machoreloc1() that translate our internal relocation to
   macho relocations used by external linking.

Change-Id: Ic5454aeb87009aaf8f1453ec7fe33e6da55d5f06
Reviewed-on: https://go-review.googlesource.com/3273Reviewed-by: David Crawshaw <crawshaw@golang.org>

Libc on Darwin/ARM has a buggy implementation of ldexp and frexp
that could not handle denormal numbers.

Also disable VFP runfast (flush-to-zero) mode so that the gc
compiler can correctly handle denormal constants used in math and
strconv tests.

Change-Id: Ie64220b882f414e0b37f406f38181c3586104d46
Reviewed-on: https://go-review.googlesource.com/2119Reviewed-by: David Crawshaw <crawshaw@golang.org>
Reviewed-by: Dave Cheney <dave@cheney.net>

In the old code, liblink, cmd/ld and runtime all have code determine
whether runtime.tlsg is an actual variable or a placeholder for TLS
relocation. This change consolidate them into one: the runtime/tls_arm.s
will ultimately determine the type of that variable.

Change-Id: I3b3f80791a1db4c2b7318f81a115972cd2237e43
Reviewed-on: https://go-review.googlesource.com/2118Reviewed-by: David Crawshaw <crawshaw@golang.org>
Reviewed-by: Dave Cheney <dave@cheney.net>

Fixes #9742.

Change-Id: Ifedf7ff9465bc49534b708d414c8e435ee9ce6cd
Reviewed-on: https://go-review.googlesource.com/3970Reviewed-by: Ian Lance Taylor <iant@golang.org>

The main issue is that the misc/cgo/{stdio,life} tests are silently
getting skipped when invoked from run.bash.

run.go should ignore any build tags after the first blank line in
source file. It already checks for test actions only upto the first
blank line. Build tags must be specified in the same block.

See http://golang.org/cl/3675 for background.

Change-Id: Id8abf000119e3335f7250d8ef34aac7811fc9dff
Reviewed-on: https://go-review.googlesource.com/3812Reviewed-by: Minux Ma <minux@golang.org>

issue9355 generated a file a.[568] in test/ directory and left it there.
For tests like these, it is best to chdir to a test specific directory
before generating any temporary files, since the tests are running
in parallel and might otherwise race with each other for the same files.

Change-Id: I58d96256d4d8ee3fda70d81077f19006064a7425
Reviewed-on: https://go-review.googlesource.com/3813Reviewed-by: Ian Lance Taylor <iant@golang.org>

PalettedColorModel was renamed to color.Palette
over three years ago by https://golang.org/cl/5132048.

Change-Id: I0204ade10eabff45620fda2990fed428c65d871e
Reviewed-on: https://go-review.googlesource.com/3305Reviewed-by: Minux Ma <minux@golang.org>
Reviewed-by: Nigel Tao <nigeltao@golang.org>

and empty keys. Also reject malformed (quoted) values.

See also https://go-review.googlesource.com/3952

Change-Id: Ice6de33b09f9904b28e410a680a90aa6c8c76fed
Reviewed-on: https://go-review.googlesource.com/3953Reviewed-by: Rob Pike <r@golang.org>

Change-Id: I7514e643a6a81ca715adbf6f8d19d3b2dd43fe6c
Reviewed-on: https://go-review.googlesource.com/3810Reviewed-by: Alan Donovan <adonovan@google.com>

Change-Id: Ica419a1215ca33dc1cff1e9e4137f204591e3cee
Reviewed-on: https://go-review.googlesource.com/3942Reviewed-by: Alan Donovan <adonovan@google.com>

Change-Id: Ia30886569141ca2e0321bea6ee1d5c9e0f79d6f9
Reviewed-on: https://go-review.googlesource.com/3941Reviewed-by: Alan Donovan <adonovan@google.com>

Change-Id: I4329c44b829fcd77e4f1a1d45904f0f8a280a595
Reviewed-on: https://go-review.googlesource.com/3940Reviewed-by: Alan Donovan <adonovan@google.com>

Change-Id: Ida064ff422d077d508ef94f52fc813daa6277a99
Reviewed-on: https://go-review.googlesource.com/3933Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

This was working when 5a was built on x86 because REG_R0 = 32,
and a 32-bit shift on x86 uses only the low 32 bits of the shift count.

On ARM, the shift clamping is different.

Moving to Go will avoid these differing shift semantics.
I tripped over and fixed this bug in new5a the same way earlier tonight.

Change-Id: Id56aa0bb1830ccf250960f843e0acb8a0409e87d
Reviewed-on: https://go-review.googlesource.com/3961Reviewed-by: Dave Cheney <dave@cheney.net>

Change-Id: I6ee7aa76673e51576b5a84c512b22a0f8af5b02f
Reviewed-on: https://go-review.googlesource.com/3966Reviewed-by: Dmitry Vyukov <dvyukov@google.com>

These benchmarks are only for functions commonly used in loops. The
other functions are typically used for inspection or setup and thus are
not performance sensitive.

Change-Id: I8d0a0ba2d8234ecacb40fa3aa9077bf93c8fe89c
Reviewed-on: https://go-review.googlesource.com/3680Reviewed-by: Dmitry Vyukov <dvyukov@google.com>

This reverts commit da4abda2.

Change-Id: Ifd09b3dae0af0c7cef5fbbc332c63e78dc90d6b1
Reviewed-on: https://go-review.googlesource.com/3960Reviewed-by: Russ Cox <rsc@golang.org>