Fixes #10893.

Change-Id: I8afeb55acda1e1c8e181379dbaf443716d63ded1
Reviewed-on: https://go-review.googlesource.com/10201Reviewed-by: Rob Pike <r@golang.org>

Modified esc.go to allow slice literals (before append)
to be non-escaping.  Modified tests to account for changes
in escape behavior and to also test the two cases that
were previously not tested.

Also minor cleanups to debug-printing within esc.go

Allocation stats for running compiler
( cd src/html/template;
  for i in {1..5} ; do
     go tool 6g -memprofile=testzz.${i}.prof  -memprofilerate=1 *.go ;
     go tool pprof -alloc_objects -text  testzz.${i}.prof ;
     done ; )
before about 86k allocations
after  about 83k allocations

Fixes #8972

Change-Id: Ib61dd70dc74adb40d6f6fdda6eaa4bf7d83481de
Reviewed-on: https://go-review.googlesource.com/10118Reviewed-by: Russ Cox <rsc@golang.org>

Currently, forEachP reuses the stopwait and stopnote fields from
stopTheWorld to track how many Ps have not responded to the safe-point
request and to sleep until all Ps have responded.

It was assumed this was safe because both stopTheWorld and forEachP
must occur under the worlsema and hence stopwait and stopnote cannot
be used for both purposes simultaneously and callers could always
determine the appropriate use based on sched.gcwaiting (which is only
set by stopTheWorld). However, this is not the case, since it's
possible for there to be a window between when an M observes that
gcwaiting is set and when it checks stopwait during which stopwait
could have changed meanings. When this happens, the M decrements
stopwait and may wakeup stopnote, but does not otherwise participate
in the forEachP protocol. As a result, stopwait is decremented too
many times, so it may reach zero before all Ps have run the safe-point
function, causing forEachP to wake up early. It will then either
observe that some P has not run the safe-point function and panic with
"P did not run fn", or the remaining P (or Ps) will run the safe-point
function before it wakes up and it will observe that stopwait is
negative and panic with "not stopped".

Fix this problem by giving forEachP its own safePointWait and
safePointNote fields.

One known sequence of events that can cause this race is as
follows. It involves three actors:

G1 is running on M1 on P1. P1 has an empty run queue.

G2/M2 is in a blocked syscall and has lost its P. (The details of this
don't matter, it just needs to be in a position where it needs to grab
an idle P.)

GC just started on G3/M3/P3. (These aren't very involved, they just
have to be separate from the other G's, M's, and P's.)

1. GC calls stopTheWorld(), which sets sched.gcwaiting to 1.

Now G1/M1 begins to enter a syscall:

2. G1/M1 invokes reentersyscall, which sets the P1's status to
   _Psyscall.

3. G1/M1's reentersyscall observes gcwaiting != 0 and calls
   entersyscall_gcwait.

4. G1/M1's entersyscall_gcwait blocks acquiring sched.lock.

Back on GC:

5. stopTheWorld cas's P1's status to _Pgcstop, does other stuff, and
   returns.

6. GC does stuff and then calls startTheWorld().

7. startTheWorld() calls procresize(), which sets P1's status to
   _Pidle and puts P1 on the idle list.

Now G2/M2 returns from its syscall and takes over P1:

8. G2/M2 returns from its blocked syscall and gets P1 from the idle
   list.

9. G2/M2 acquires P1, which sets P1's status to _Prunning.

10. G2/M2 starts a new syscall and invokes reentersyscall, which sets
    P1's status to _Psyscall.

Back on G1/M1:

11. G1/M1 finally acquires sched.lock in entersyscall_gcwait.

At this point, G1/M1 still thinks it's running on P1. P1's status is
_Psyscall, which is consistent with what G1/M1 is doing, but it's
_Psyscall because *G2/M2* put it in to _Psyscall, not G1/M1. This is
basically an ABA race on P1's status.

Because forEachP currently shares stopwait with stopTheWorld. G1/M1's
entersyscall_gcwait observes the non-zero stopwait set by forEachP,
but mistakes it for a stopTheWorld. It cas's P1's status from
_Psyscall (set by G2/M2) to _Pgcstop and proceeds to decrement
stopwait one more time than forEachP was expecting.

Fixes #10618. (See the issue for details on why the above race is safe
when forEachP is not involved.)

Prior to this commit, the command
  stress ./runtime.test -test.run TestFutexsleep\|TestGoroutineProfile
would reliably fail after a few hundred runs. With this commit, it
ran for over 2 million runs and never crashed.

Change-Id: I9a91ea20035b34b6e5f07ef135b144115f281f30
Reviewed-on: https://go-review.googlesource.com/10157Reviewed-by: Russ Cox <rsc@golang.org>

Currently, startTheWorld releases worldsema before starting the
world. Since startTheWorld can change gomaxprocs after allowing Ps to
run, this means that gomaxprocs can change while another P holds
worldsema.

Unfortunately, the garbage collector and forEachP assume that holding
worldsema protects against changes in gomaxprocs (which it *almost*
does). In particular, this is causing somewhat frequent "P did not run
fn" crashes in forEachP in the runtime tests because gomaxprocs is
changing between the several loops that forEachP does over all the Ps.

Fix this by only releasing worldsema after the world is started.

This relates to issue #10618. forEachP still fails under stress
testing, but much less frequently.

Change-Id: I085d627b70cca9ebe9af28fe73b9872f1bb224ff
Reviewed-on: https://go-review.googlesource.com/10156Reviewed-by: Russ Cox <rsc@golang.org>

Currently, startTheWorld clears preemptoff for the current M before
starting the world. A few callers increment m.locks around
startTheWorld, presumably to prevent preemption any time during
starting the world. This is almost certainly pointless (none of the
other callers do this), but there's no harm in making startTheWorld
keep preemption disabled until it's all done, which definitely lets us
drop these m.locks manipulations.

Change-Id: I8a93658abd0c72276c9bafa3d2c7848a65b4691a
Reviewed-on: https://go-review.googlesource.com/10155Reviewed-by: Russ Cox <rsc@golang.org>

There are several steps to stopping and starting the world and
currently they're open-coded in several places. The garbage collector
is the only thing that needs to stop and start the world in a
non-trivial pattern. Replace all other uses with calls to higher-level
functions that implement the entire pattern necessary to stop and
start the world.

This is a pure refectoring and should not change any code semantics.
In the following commits, we'll make changes that are easier to do
with this abstraction in place.

This commit renames the old starttheworld to startTheWorldWithSema.
This is a slight misnomer right now because the callers release
worldsema just before calling this. However, a later commit will swap
these and I don't want to think of another name in the mean time.

Change-Id: I5dc97f87b44fb98963c49c777d7053653974c911
Reviewed-on: https://go-review.googlesource.com/10154Reviewed-by: Russ Cox <rsc@golang.org>

In order to avoid deadlocks, startGC avoids kicking off GC if locks
are held by the calling M. However, it currently fails to check
preemptoff, which is the other way to disable preemption.

Fix this by adding a check for preemptoff.

Change-Id: Ie1083166e5ba4af5c9d6c5a42efdfaaef41ca997
Reviewed-on: https://go-review.googlesource.com/10153Reviewed-by: Russ Cox <rsc@golang.org>

It is misleading when stack trace say:

signal arrived during cgo execution

but we are not in cgo call.

Change-Id: I627e2f2bdc7755074677f77f21befc070a101914
Reviewed-on: https://go-review.googlesource.com/9190Reviewed-by: Russ Cox <rsc@golang.org>

If make.bash fails, there is no point continuing any further.

Fixes #10880.

Change-Id: I350cc16999372422ad3d2e0327d52d467886a5b1
Reviewed-on: https://go-review.googlesource.com/10180Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Currently, runqsteal steals Gs from another P into an intermediate
buffer and then copies those Gs into the current P's run queue. This
intermediate buffer itself was moved from the stack to the P in commit
c4fe5031 to eliminate the cost of zeroing it on every steal.

This commit follows up c4fe5031 by stealing directly into the current
P's run queue, which eliminates the copy and the need for the
intermediate buffer. The update to the tail pointer is only committed
once the entire steal operation has succeeded, so the semantics of
stealing do not change.

Change-Id: Icdd7a0eb82668980bf42c0154b51eef6419fdd51
Reviewed-on: https://go-review.googlesource.com/9998Reviewed-by: Russ Cox <rsc@golang.org>
Run-TryBot: Austin Clements <austin@google.com>

Fixes #10336.

Change-Id: Idc3f60851aea590575dc293165d4d6f85ae001bc
Reviewed-on: https://go-review.googlesource.com/9645Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: I2ebb36c6c5de9d34e52ed523e9c888452591924a
Reviewed-on: https://go-review.googlesource.com/10152Reviewed-by: Minux Ma <minux@golang.org>

Change-Id: Ie67e295bf327126dfdc75b73979fe33fbcb79ad9
Reviewed-on: https://go-review.googlesource.com/10150Reviewed-by: Austin Clements <austin@google.com>

Small types record the location of pointers in their memory layout
by using a simple bitmap. In Go 1.4 the bitmap held 4-bit entries,
and in Go 1.5 the bitmap holds 1-bit entries, but in both cases using
a bitmap for a large type containing arrays does not make sense:
if someone refers to the type [1<<28]*byte in a program in such
a way that the type information makes it into the binary, it would be
a waste of space to write a 128 MB (for 4-bit entries) or even 32 MB
(for 1-bit entries) bitmap full of 1s into the binary or even to keep
one in memory during the execution of the program.

For large types containing arrays, it is much more compact to describe
the locations of pointers using a notation that can express repetition
than to lay out a bitmap of pointers. Go 1.4 included such a notation,
called ``GC programs'' but it was complex, required recursion during
decoding, and was generally slow. Dmitriy measured the execution of
these programs writing directly to the heap bitmap as being 7x slower
than copying from a preunrolled 4-bit mask (and frankly that code was
not terribly fast either). For some tests, unrollgcprog1 was seen costing
as much as 3x more than the rest of malloc combined.

This CL introduces a different form for the GC programs. They use a
simple Lempel-Ziv-style encoding of the 1-bit pointer information,
in which the only operations are (1) emit the following n bits
and (2) repeat the last n bits c more times. This encoding can be
generated directly from the Go type information (using repetition
only for arrays or large runs of non-pointer data) and it can be decoded
very efficiently. In particular the decoding requires little state and
no recursion, so that the entire decoding can run without any memory
accesses other than the reads of the encoding and the writes of the
decoded form to the heap bitmap. For recursive types like arrays of
arrays of arrays, the inner instructions are only executed once, not
n times, so that large repetitions run at full speed. (In contrast, large
repetitions in the old programs repeated the individual bit-level layout
of the inner data over and over.) The result is as much as 25x faster
decoding compared to the old form.

Because the old decoder was so slow, Go 1.4 had three (or so) cases
for how to set the heap bitmap bits for an allocation of a given type:

(1) If the type had an even number of words up to 32 words, then
the 4-bit pointer mask for the type fit in no more than 16 bytes;
store the 4-bit pointer mask directly in the binary and copy from it.

(1b) If the type had an odd number of words up to 15 words, then
the 4-bit pointer mask for the type, doubled to end on a byte boundary,
fit in no more than 16 bytes; store that doubled mask directly in the
binary and copy from it.

(2) If the type had an even number of words up to 128 words,
or an odd number of words up to 63 words (again due to doubling),
then the 4-bit pointer mask would fit in a 64-byte unrolled mask.
Store a GC program in the binary, but leave space in the BSS for
the unrolled mask. Execute the GC program to construct the mask the
first time it is needed, and thereafter copy from the mask.

(3) Otherwise, store a GC program and execute it to write directly to
the heap bitmap each time an object of that type is allocated.
(This is the case that was 7x slower than the other two.)

Because the new pointer masks store 1-bit entries instead of 4-bit
entries and because using the decoder no longer carries a significant
overhead, after this CL (that is, for Go 1.5) there are only two cases:

(1) If the type is 128 words or less (no condition about odd or even),
store the 1-bit pointer mask directly in the binary and use it to
initialize the heap bitmap during malloc. (Implemented in CL 9702.)

(2) There is no case 2 anymore.

(3) Otherwise, store a GC program and execute it to write directly to
the heap bitmap each time an object of that type is allocated.

Executing the GC program directly into the heap bitmap (case (3) above)
was disabled for the Go 1.5 dev cycle, both to avoid needing to use
GC programs for typedmemmove and to avoid updating that code as
the heap bitmap format changed. Typedmemmove no longer uses this
type information; as of CL 9886 it uses the heap bitmap directly.
Now that the heap bitmap format is stable, we reintroduce GC programs
and their space savings.

Benchmarks for heapBitsSetType, before this CL vs this CL:

name                    old mean               new mean              delta
SetTypePtr              7.59ns × (0.99,1.02)   5.16ns × (1.00,1.00)  -32.05% (p=0.000)
SetTypePtr8             21.0ns × (0.98,1.05)   21.4ns × (1.00,1.00)     ~    (p=0.179)
SetTypePtr16            24.1ns × (0.99,1.01)   24.6ns × (1.00,1.00)   +2.41% (p=0.001)
SetTypePtr32            31.2ns × (0.99,1.01)   32.4ns × (0.99,1.02)   +3.72% (p=0.001)
SetTypePtr64            45.2ns × (1.00,1.00)   47.2ns × (1.00,1.00)   +4.42% (p=0.000)
SetTypePtr126           75.8ns × (0.99,1.01)   79.1ns × (1.00,1.00)   +4.25% (p=0.000)
SetTypePtr128           74.3ns × (0.99,1.01)   77.6ns × (1.00,1.01)   +4.55% (p=0.000)
SetTypePtrSlice          726ns × (1.00,1.01)    712ns × (1.00,1.00)   -1.95% (p=0.001)
SetTypeNode1            20.0ns × (0.99,1.01)   20.7ns × (1.00,1.00)   +3.71% (p=0.000)
SetTypeNode1Slice        112ns × (1.00,1.00)    113ns × (0.99,1.00)     ~    (p=0.070)
SetTypeNode8            23.9ns × (1.00,1.00)   24.7ns × (1.00,1.01)   +3.18% (p=0.000)
SetTypeNode8Slice        294ns × (0.99,1.02)    287ns × (0.99,1.01)   -2.38% (p=0.015)
SetTypeNode64           52.8ns × (0.99,1.03)   51.8ns × (0.99,1.01)     ~    (p=0.069)
SetTypeNode64Slice      1.13µs × (0.99,1.05)   1.14µs × (0.99,1.00)     ~    (p=0.767)
SetTypeNode64Dead       36.0ns × (1.00,1.01)   32.5ns × (0.99,1.00)   -9.67% (p=0.000)
SetTypeNode64DeadSlice  1.43µs × (0.99,1.01)   1.40µs × (1.00,1.00)   -2.39% (p=0.001)
SetTypeNode124          75.7ns × (1.00,1.01)   79.0ns × (1.00,1.00)   +4.44% (p=0.000)
SetTypeNode124Slice     1.94µs × (1.00,1.01)   2.04µs × (0.99,1.01)   +4.98% (p=0.000)
SetTypeNode126          75.4ns × (1.00,1.01)   77.7ns × (0.99,1.01)   +3.11% (p=0.000)
SetTypeNode126Slice     1.95µs × (0.99,1.01)   2.03µs × (1.00,1.00)   +3.74% (p=0.000)
SetTypeNode128          85.4ns × (0.99,1.01)  122.0ns × (1.00,1.00)  +42.89% (p=0.000)
SetTypeNode128Slice     2.20µs × (1.00,1.01)   2.36µs × (0.98,1.02)   +7.48% (p=0.001)
SetTypeNode130          83.3ns × (1.00,1.00)  123.0ns × (1.00,1.00)  +47.61% (p=0.000)
SetTypeNode130Slice     2.30µs × (0.99,1.01)   2.40µs × (0.98,1.01)   +4.37% (p=0.000)
SetTypeNode1024          498ns × (1.00,1.00)    537ns × (1.00,1.00)   +7.96% (p=0.000)
SetTypeNode1024Slice    15.5µs × (0.99,1.01)   17.8µs × (1.00,1.00)  +15.27% (p=0.000)

The above compares always using a cached pointer mask (and the
corresponding waste of memory) against using the programs directly.
Some slowdown is expected, in exchange for having a better general algorithm.
The GC programs kick in for SetTypeNode128, SetTypeNode130, SetTypeNode1024,
along with the slice variants of those.
It is possible that the cutoff of 128 words (bits) should be raised
in a followup CL, but even with this low cutoff the GC programs are
faster than Go 1.4's "fast path" non-GC program case.

Benchmarks for heapBitsSetType, Go 1.4 vs this CL:

name                    old mean              new mean              delta
SetTypePtr              6.89ns × (1.00,1.00)  5.17ns × (1.00,1.00)  -25.02% (p=0.000)
SetTypePtr8             25.8ns × (0.97,1.05)  21.5ns × (1.00,1.00)  -16.70% (p=0.000)
SetTypePtr16            39.8ns × (0.97,1.02)  24.7ns × (0.99,1.01)  -37.81% (p=0.000)
SetTypePtr32            68.8ns × (0.98,1.01)  32.2ns × (1.00,1.01)  -53.18% (p=0.000)
SetTypePtr64             130ns × (1.00,1.00)    47ns × (1.00,1.00)  -63.67% (p=0.000)
SetTypePtr126            241ns × (0.99,1.01)    79ns × (1.00,1.01)  -67.25% (p=0.000)
SetTypePtr128           2.07µs × (1.00,1.00)  0.08µs × (1.00,1.00)  -96.27% (p=0.000)
SetTypePtrSlice         1.05µs × (0.99,1.01)  0.72µs × (0.99,1.02)  -31.70% (p=0.000)
SetTypeNode1            16.0ns × (0.99,1.01)  20.8ns × (0.99,1.03)  +29.91% (p=0.000)
SetTypeNode1Slice        184ns × (0.99,1.01)   112ns × (0.99,1.01)  -39.26% (p=0.000)
SetTypeNode8            29.5ns × (0.97,1.02)  24.6ns × (1.00,1.00)  -16.50% (p=0.000)
SetTypeNode8Slice        624ns × (0.98,1.02)   285ns × (1.00,1.00)  -54.31% (p=0.000)
SetTypeNode64            135ns × (0.96,1.08)    52ns × (0.99,1.02)  -61.32% (p=0.000)
SetTypeNode64Slice      3.83µs × (1.00,1.00)  1.14µs × (0.99,1.01)  -70.16% (p=0.000)
SetTypeNode64Dead        134ns × (0.99,1.01)    32ns × (1.00,1.01)  -75.74% (p=0.000)
SetTypeNode64DeadSlice  3.83µs × (0.99,1.00)  1.40µs × (1.00,1.01)  -63.42% (p=0.000)
SetTypeNode124           240ns × (0.99,1.01)    79ns × (1.00,1.01)  -67.05% (p=0.000)
SetTypeNode124Slice     7.27µs × (1.00,1.00)  2.04µs × (1.00,1.00)  -71.95% (p=0.000)
SetTypeNode126          2.06µs × (0.99,1.01)  0.08µs × (0.99,1.01)  -96.23% (p=0.000)
SetTypeNode126Slice     64.4µs × (1.00,1.00)   2.0µs × (1.00,1.00)  -96.85% (p=0.000)
SetTypeNode128          2.09µs × (1.00,1.01)  0.12µs × (1.00,1.00)  -94.15% (p=0.000)
SetTypeNode128Slice     65.4µs × (1.00,1.00)   2.4µs × (0.99,1.03)  -96.39% (p=0.000)
SetTypeNode130          2.11µs × (1.00,1.00)  0.12µs × (1.00,1.00)  -94.18% (p=0.000)
SetTypeNode130Slice     66.3µs × (1.00,1.00)   2.4µs × (0.97,1.08)  -96.34% (p=0.000)
SetTypeNode1024         16.0µs × (1.00,1.01)   0.5µs × (1.00,1.00)  -96.65% (p=0.000)
SetTypeNode1024Slice     512µs × (1.00,1.00)    18µs × (0.98,1.04)  -96.45% (p=0.000)

SetTypeNode124 uses a 124 data + 2 ptr = 126-word allocation.
Both Go 1.4 and this CL are using pointer bitmaps for this case,
so that's an overall 3x speedup for using pointer bitmaps.

SetTypeNode128 uses a 128 data + 2 ptr = 130-word allocation.
Both Go 1.4 and this CL are running the GC program for this case,
so that's an overall 17x speedup when using GC programs (and
I've seen >20x on other systems).

Comparing Go 1.4's SetTypeNode124 (pointer bitmap) against
this CL's SetTypeNode128 (GC program), the slow path in the
code in this CL is 2x faster than the fast path in Go 1.4.

The Go 1 benchmarks are basically unaffected compared to just before this CL.

Go 1 benchmarks, before this CL vs this CL:

name                   old mean              new mean              delta
BinaryTree17            5.87s × (0.97,1.04)   5.91s × (0.96,1.04)    ~    (p=0.306)
Fannkuch11              4.38s × (1.00,1.00)   4.37s × (1.00,1.01)  -0.22% (p=0.006)
FmtFprintfEmpty        90.7ns × (0.97,1.10)  89.3ns × (0.96,1.09)    ~    (p=0.280)
FmtFprintfString        282ns × (0.98,1.04)   287ns × (0.98,1.07)  +1.72% (p=0.039)
FmtFprintfInt           269ns × (0.99,1.03)   282ns × (0.97,1.04)  +4.87% (p=0.000)
FmtFprintfIntInt        478ns × (0.99,1.02)   481ns × (0.99,1.02)  +0.61% (p=0.048)
FmtFprintfPrefixedInt   399ns × (0.98,1.03)   400ns × (0.98,1.05)    ~    (p=0.533)
FmtFprintfFloat         563ns × (0.99,1.01)   570ns × (1.00,1.01)  +1.37% (p=0.000)
FmtManyArgs            1.89µs × (0.99,1.01)  1.92µs × (0.99,1.02)  +1.88% (p=0.000)
GobDecode              15.2ms × (0.99,1.01)  15.2ms × (0.98,1.05)    ~    (p=0.609)
GobEncode              11.6ms × (0.98,1.03)  11.9ms × (0.98,1.04)  +2.17% (p=0.000)
Gzip                    648ms × (0.99,1.01)   648ms × (1.00,1.01)    ~    (p=0.835)
Gunzip                  142ms × (1.00,1.00)   143ms × (1.00,1.01)    ~    (p=0.169)
HTTPClientServer       90.5µs × (0.98,1.03)  91.5µs × (0.98,1.04)  +1.04% (p=0.045)
JSONEncode             31.5ms × (0.98,1.03)  31.4ms × (0.98,1.03)    ~    (p=0.549)
JSONDecode              111ms × (0.99,1.01)   107ms × (0.99,1.01)  -3.21% (p=0.000)
Mandelbrot200          6.01ms × (1.00,1.00)  6.01ms × (1.00,1.00)    ~    (p=0.878)
GoParse                6.54ms × (0.99,1.02)  6.61ms × (0.99,1.03)  +1.08% (p=0.004)
RegexpMatchEasy0_32     160ns × (1.00,1.01)   161ns × (1.00,1.00)  +0.40% (p=0.000)
RegexpMatchEasy0_1K     560ns × (0.99,1.01)   559ns × (0.99,1.01)    ~    (p=0.088)
RegexpMatchEasy1_32     138ns × (0.99,1.01)   138ns × (1.00,1.00)    ~    (p=0.380)
RegexpMatchEasy1_1K     877ns × (1.00,1.00)   878ns × (1.00,1.00)    ~    (p=0.157)
RegexpMatchMedium_32    251ns × (0.99,1.00)   251ns × (1.00,1.01)  +0.28% (p=0.021)
RegexpMatchMedium_1K   72.6µs × (1.00,1.00)  72.6µs × (1.00,1.00)    ~    (p=0.539)
RegexpMatchHard_32     3.84µs × (1.00,1.00)  3.84µs × (1.00,1.00)    ~    (p=0.378)
RegexpMatchHard_1K      117µs × (1.00,1.00)   117µs × (1.00,1.00)    ~    (p=0.067)
Revcomp                 904ms × (0.99,1.02)   904ms × (0.99,1.01)    ~    (p=0.943)
Template                125ms × (0.99,1.02)   127ms × (0.99,1.01)  +1.79% (p=0.000)
TimeParse               627ns × (0.99,1.01)   622ns × (0.99,1.01)  -0.88% (p=0.000)
TimeFormat              655ns × (0.99,1.02)   655ns × (0.99,1.02)    ~    (p=0.976)

For the record, Go 1 benchmarks, Go 1.4 vs this CL:

name                   old mean              new mean              delta
BinaryTree17            4.61s × (0.97,1.05)   5.91s × (0.98,1.03)  +28.35% (p=0.000)
Fannkuch11              4.40s × (0.99,1.03)   4.41s × (0.99,1.01)     ~    (p=0.212)
FmtFprintfEmpty         102ns × (0.99,1.01)    84ns × (0.99,1.02)  -18.38% (p=0.000)
FmtFprintfString        302ns × (0.98,1.01)   303ns × (0.99,1.02)     ~    (p=0.203)
FmtFprintfInt           313ns × (0.97,1.05)   270ns × (0.99,1.01)  -13.69% (p=0.000)
FmtFprintfIntInt        524ns × (0.98,1.02)   477ns × (0.99,1.00)   -8.87% (p=0.000)
FmtFprintfPrefixedInt   424ns × (0.98,1.02)   386ns × (0.99,1.01)   -8.96% (p=0.000)
FmtFprintfFloat         652ns × (0.98,1.02)   594ns × (0.97,1.05)   -8.97% (p=0.000)
FmtManyArgs            2.13µs × (0.99,1.02)  1.94µs × (0.99,1.01)   -8.92% (p=0.000)
GobDecode              17.1ms × (0.99,1.02)  14.9ms × (0.98,1.03)  -13.07% (p=0.000)
GobEncode              13.5ms × (0.98,1.03)  11.5ms × (0.98,1.03)  -15.25% (p=0.000)
Gzip                    656ms × (0.99,1.02)   647ms × (0.99,1.01)   -1.29% (p=0.000)
Gunzip                  143ms × (0.99,1.02)   144ms × (0.99,1.01)     ~    (p=0.204)
HTTPClientServer       88.2µs × (0.98,1.02)  90.8µs × (0.98,1.01)   +2.93% (p=0.000)
JSONEncode             32.2ms × (0.98,1.02)  30.9ms × (0.97,1.04)   -4.06% (p=0.001)
JSONDecode              121ms × (0.98,1.02)   110ms × (0.98,1.05)   -8.95% (p=0.000)
Mandelbrot200          6.06ms × (0.99,1.01)  6.11ms × (0.98,1.04)     ~    (p=0.184)
GoParse                6.76ms × (0.97,1.04)  6.58ms × (0.98,1.05)   -2.63% (p=0.003)
RegexpMatchEasy0_32     195ns × (1.00,1.01)   155ns × (0.99,1.01)  -20.43% (p=0.000)
RegexpMatchEasy0_1K     479ns × (0.98,1.03)   535ns × (0.99,1.02)  +11.59% (p=0.000)
RegexpMatchEasy1_32     169ns × (0.99,1.02)   131ns × (0.99,1.03)  -22.44% (p=0.000)
RegexpMatchEasy1_1K    1.53µs × (0.99,1.01)  0.87µs × (0.99,1.02)  -43.07% (p=0.000)
RegexpMatchMedium_32    334ns × (0.99,1.01)   242ns × (0.99,1.01)  -27.53% (p=0.000)
RegexpMatchMedium_1K    125µs × (1.00,1.01)    72µs × (0.99,1.03)  -42.53% (p=0.000)
RegexpMatchHard_32     6.03µs × (0.99,1.01)  3.79µs × (0.99,1.01)  -37.12% (p=0.000)
RegexpMatchHard_1K      189µs × (0.99,1.02)   115µs × (0.99,1.01)  -39.20% (p=0.000)
Revcomp                 935ms × (0.96,1.03)   926ms × (0.98,1.02)     ~    (p=0.083)
Template                146ms × (0.97,1.05)   119ms × (0.99,1.01)  -18.37% (p=0.000)
TimeParse               660ns × (0.99,1.01)   624ns × (0.99,1.02)   -5.43% (p=0.000)
TimeFormat              670ns × (0.98,1.02)   710ns × (1.00,1.01)   +5.97% (p=0.000)

This CL is a bit larger than I would like, but the compiler, linker, runtime,
and package reflect all need to be in sync about the format of these programs,
so there is no easy way to split this into independent changes (at least
while keeping the build working at each change).

Fixes #9625.
Fixes #10524.

Change-Id: I9e3e20d6097099d0f8532d1cb5b1af528804989a
Reviewed-on: https://go-review.googlesource.com/9888Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Russ Cox <rsc@golang.org>

The Template objects are supposed to be goroutine-safe once they
have been parsed. This includes the text and html ones.

For html/template, the escape mechanism is triggered at execution
time. It may alter the internal structures of the template, so
a mutex protects them against concurrent accesses.

The text/template package is free of any synchronization primitive.

A race condition may occur when nested templates are escaped:
the escape algorithm alters the function maps of the associated
text templates, while a concurrent template execution may access
the function maps in read mode.

The less invasive fix I have found is to introduce a RWMutex in
text/template to protect the function maps. This is unfortunate
but it should be effective.

Fixes #9945

Change-Id: I1edb73c0ed0f1fcddd2f1516230b548b92ab1269
Reviewed-on: https://go-review.googlesource.com/10101Reviewed-by: Rob Pike <r@golang.org>

Change-Id: I40e8a4a2e62253233b66f6a2e61e222437292c31
Reviewed-on: https://go-review.googlesource.com/10151Reviewed-by: Minux Ma <minux@golang.org>

This allows the removal of a fudge in data.go.

We have to defer the calls to adddynlib on non-Darwin until after we have
decided whether we are externally or internally linking.  The Macho/ELF
separation could do with some cleaning up, but: code freeze.

Fixing this once rather than per-arch is what inspired the previous CLs.

Change-Id: I0166f7078a045dc09827745479211247466c0c54
Reviewed-on: https://go-review.googlesource.com/10002
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>

The only essential difference is elf32 vs elf64, I assume the other differences
are bugs in one version or another...

Change-Id: Ie6ff33d5574a6592b543df9983eff8fdf88c97a1
Reviewed-on: https://go-review.googlesource.com/10001
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
Reviewed-by: Russ Cox <rsc@golang.org>

They were all essentially the same.

Change-Id: I6e0b548cda6e4bbe2ec3b3025b746d1f6d332d48
Reviewed-on: https://go-review.googlesource.com/10000
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>

Change-Id: Ic064fe7c6bd3304dcc8c3f7b3b5393870b5387c2
Reviewed-on: https://go-review.googlesource.com/10119
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Austin Clements <austin@google.com>

This is an automated follow-up to CL 10120.
It was generated with a combination of eg and gofmt -r.

No functional changes. Passes toolstash -cmp.

Change-Id: I0dc6d146372012b4cce9cc4064066daa6694eee6
Reviewed-on: https://go-review.googlesource.com/10144Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

The previous implementation spawned an extra goroutine to handle
rechecking resolv.conf for changes.

This change eliminates the extra goroutine, and has rechecking
done as part of a lookup.  A side effect of this change is that the
first lookup after a resolv.conf change will now succeed, whereas
previously it would have failed.  It also fixes rechecking logic to
ignore resolv.conf parsing errors as it should.

Fixes #8652
Fixes #10576
Fixes #10649
Fixes #10650
Fixes #10845

Change-Id: I502b587c445fa8eca5207ca4f2c8ec8c339fec7f
Reviewed-on: https://go-review.googlesource.com/9991
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Mikio Hara <mikioh.mikioh@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Fixes #8940.

Change-Id: Ie9e5149983518ba8d56ddd82ac8f4cde6b644167
Reviewed-on: https://go-review.googlesource.com/10089Reviewed-by: Alan Donovan <adonovan@google.com>

Does the TODOs added by https://golang.org/cl/7623.

Passes rsc.io/toolstash/buildall.

Change-Id: I23913a8f03834640e9795d48318febb3f88c10f9
Reviewed-on: https://go-review.googlesource.com/9160Reviewed-by: Russ Cox <rsc@golang.org>

This extends cmd/yacc with support for

	%error { tokens } : message

syntax to specify custom error messages to use instead of the default
generic ones.  This allows merging go.errors into go.y and removing
the yaccerrors.go tool.

Updates #9968.

Change-Id: I781219c568b86472755f877f48401eaeab00ead5
Reviewed-on: https://go-review.googlesource.com/8563Reviewed-by: Russ Cox <rsc@golang.org>

Fixes darwin-arm{,64} builds.
Child processes aren't allowed on iOS.

Change-Id: I9258ed4df757ec394ef6327dbda96f5b9705bcdd
Reviewed-on: https://go-review.googlesource.com/10142Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>

This reverts commit 5726af54.

It broke all the builds.

Change-Id: I4b1dde86f9433717d303c1dabd6aa1a2bf97fab2
Reviewed-on: https://go-review.googlesource.com/10143Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

All slice types which have elements of kind reflect.Uint8 are marshalled
into base64 for compactness. When decoding such data into a custom type
based on []byte the decoder checked the slice kind instead of the slice
element kind, so no appropriate decoder was found.

Fixed by letting the decoder check slice element kind like the encoder.
This guarantees that already encoded data can still be successfully
decoded.

Fixes #8962.

Change-Id: Ia320d4dc2c6e9e5fe6d8dc15788c81da23d20c4f
Reviewed-on: https://go-review.googlesource.com/9371Reviewed-by: Peter Waldschmidt <peter@waldschmidt.com>
Reviewed-by: Russ Cox <rsc@golang.org>

Fixes #8042.

Change-Id: I75080f24104256065fd73b07a13c5b8e7d6da94c
Reviewed-on: https://go-review.googlesource.com/9442Reviewed-by: Russ Cox <rsc@golang.org>

Name will be converted from an anonymous to a
named field in a subsequent, automated CL.

No functional changes. Passes toolstash -cmp.

This reduces the size of gc.Node from 424 to 400 bytes.
This in turn reduces the permanent (pprof -inuse_space)
memory usage while compiling the test/rotate?.go tests:

test	old(MB)	new(MB)	change
rotate0	379.49	367.30	-3.21%
rotate1	373.42	361.59	-3.16%
rotate2	381.17	368.77	-3.25%
rotate3	374.30	362.48	-3.15%

Updates #9933.

Change-Id: I21479527c136add4f1efb9342774e3be3e276e83
Reviewed-on: https://go-review.googlesource.com/10120Reviewed-by: Russ Cox <rsc@golang.org>

This CL was generated by updating Val in go.go
and then running:

sed -i "" 's/\.U\.[SBXFC]val = /.U = /' *.go
sed -i "" 's/\.U\.Sval/.U.\(string\)/g' *.go *.y
sed -i "" 's/\.U\.Bval/.U.\(bool\)/g' *.go *.y
sed -i "" 's/\.U\.Xval/.U.\(\*Mpint\)/g' *.go *.y
sed -i "" 's/\.U\.Fval/.U.\(\*Mpflt\)/g' *.go *.y
sed -i "" 's/\.U\.Cval/.U.\(\*Mpcplx\)/g' *.go *.y

No functional changes. Passes toolstash -cmp.

This reduces the size of gc.Node from 424 to 392 bytes.
This in turn reduces the permanent (pprof -inuse_space)
memory usage while compiling the test/rotate?.go tests:

test	old(MB)	new(MB)	change
rotate0	379.49	364.78	-3.87%
rotate1	373.42	359.07	-3.84%
rotate2	381.17	366.24	-3.91%
rotate3	374.30	359.95	-3.83%

CL 8445 was similar to this; gri asked that Val's implementation
be hidden first. CLs 8912, 9263, and 9267 have at least
isolated the changes to the cmd/internal/gc package.

Updates #9933.

Change-Id: I83ddfe003d48e0a73c92e819edd3b5e620023084
Reviewed-on: https://go-review.googlesource.com/10059Reviewed-by: Russ Cox <rsc@golang.org>

This trivial change is a prerequisite to
converting Val.U to an interface{}.

No functional changes. Passes toolstash -cmp.

Change-Id: I17ff036f68d29a9ed0097a8b23ae1c91e6ce8c21
Reviewed-on: https://go-review.googlesource.com/10058Reviewed-by: Russ Cox <rsc@golang.org>

Remove all uses of Node.Val outside of the gc package.

A subsequent, automated commit in the Go 1.6 cycle
will unexport Node.Val.

No functional changes. Passes toolstash -cmp.

Change-Id: Ia92ae6a7766c83ab3e45c69edab24a9581c824f9
Reviewed-on: https://go-review.googlesource.com/9267Reviewed-by: Russ Cox <rsc@golang.org>

Remove all uses of Mp* outside of the gc package.

A subsequent, automated commit in the Go 1.6
cycle will unexport all Mp* functions and types.

No functional changes. Passes toolstash -cmp.

Change-Id: Ie1604cb5b84ffb30b47f4777d4235570f2c62709
Reviewed-on: https://go-review.googlesource.com/9263Reviewed-by: Russ Cox <rsc@golang.org>

Preallocating them in reflect means that
(1) if you say _ = PtrTo(ArrayOf(1000000000, reflect.TypeOf(byte(0)))), you just allocated 1GB of data
(2) if you say it again, that's *another* GB of data.

The only use of t.zero in the runtime is for map elements.
Delay the allocation until the creation of a map with that element type,
and share the zeros.

The one downside of the shared zero is that it's not garbage collected,
but it's also never written, so the OS should be able to handle it fairly
efficiently.

Change-Id: I56b098a091abf3ac0945de28ebef9a6c08e76614
Reviewed-on: https://go-review.googlesource.com/10111Reviewed-by: Keith Randall <khr@golang.org>

This may be mostly noise but:

name                   old mean              new mean              delta
BinaryTree17            6.03s × (0.98,1.02)   5.98s × (0.97,1.03)    ~    (p=0.306)
Fannkuch11              4.42s × (0.99,1.01)   4.34s × (0.99,1.02)  -1.83% (p=0.000)
FmtFprintfEmpty        84.7ns × (0.99,1.01)  84.4ns × (1.00,1.00)    ~    (p=0.138)
FmtFprintfString        289ns × (0.98,1.02)   289ns × (1.00,1.01)    ~    (p=0.509)
FmtFprintfInt           280ns × (0.97,1.03)   272ns × (0.98,1.03)  -2.64% (p=0.003)
FmtFprintfIntInt        484ns × (0.98,1.02)   482ns × (0.98,1.03)    ~    (p=0.606)
FmtFprintfPrefixedInt   397ns × (0.98,1.03)   393ns × (0.99,1.02)    ~    (p=0.064)
FmtFprintfFloat         573ns × (0.99,1.01)   569ns × (0.99,1.01)  -0.69% (p=0.023)
FmtManyArgs            1.89µs × (0.99,1.02)  1.91µs × (0.98,1.02)    ~    (p=0.219)
GobDecode              15.4ms × (0.99,1.02)  15.1ms × (0.99,1.01)  -2.05% (p=0.000)
GobEncode              12.0ms × (0.97,1.04)  11.9ms × (0.97,1.03)    ~    (p=0.458)
Gzip                    652ms × (0.99,1.01)   653ms × (0.99,1.01)    ~    (p=0.743)
Gunzip                  144ms × (0.99,1.01)   143ms × (0.99,1.01)    ~    (p=0.134)
HTTPClientServer       91.6µs × (0.99,1.01)  91.8µs × (0.99,1.03)    ~    (p=0.678)
JSONEncode             31.9ms × (1.00,1.00)  32.0ms × (0.99,1.01)    ~    (p=0.334)
JSONDecode              110ms × (0.99,1.01)   110ms × (0.99,1.01)    ~    (p=0.315)
Mandelbrot200          6.04ms × (0.99,1.01)  6.04ms × (1.00,1.01)    ~    (p=0.596)
GoParse                6.72ms × (0.98,1.03)  6.74ms × (0.99,1.03)    ~    (p=0.577)
RegexpMatchEasy0_32     161ns × (0.99,1.01)   160ns × (1.00,1.00)  -0.83% (p=0.002)
RegexpMatchEasy0_1K     542ns × (0.99,1.02)   541ns × (0.99,1.01)    ~    (p=0.396)
RegexpMatchEasy1_32     140ns × (0.98,1.01)   137ns × (1.00,1.00)  -2.12% (p=0.000)
RegexpMatchEasy1_1K     892ns × (0.99,1.01)   891ns × (1.00,1.01)    ~    (p=0.631)
RegexpMatchMedium_32    255ns × (0.99,1.01)   253ns × (0.99,1.01)  -0.76% (p=0.008)
RegexpMatchMedium_1K   73.1µs × (1.00,1.01)  72.9µs × (1.00,1.00)    ~    (p=0.229)
RegexpMatchHard_32     3.86µs × (1.00,1.01)  3.85µs × (1.00,1.00)    ~    (p=0.341)
RegexpMatchHard_1K      117µs × (1.00,1.01)   117µs × (0.99,1.00)    ~    (p=0.955)
Revcomp                 954ms × (0.97,1.03)   955ms × (0.98,1.02)    ~    (p=0.894)
Template                133ms × (0.97,1.05)   129ms × (0.99,1.02)  -2.50% (p=0.014)
TimeParse               629ns × (0.99,1.01)   626ns × (0.99,1.01)    ~    (p=0.106)
TimeFormat              663ns × (0.99,1.01)   660ns × (0.99,1.02)    ~    (p=0.231)

Change-Id: I580e03ed01b0629cb5eae4c4637618f20127f924
Reviewed-on: https://go-review.googlesource.com/9994Reviewed-by: Austin Clements <austin@google.com>

The effect of this CL:

name                   old mean              new mean              delta
BinaryTree17            5.97s × (0.96,1.04)   5.95s × (0.98,1.02)    ~    (p=0.697)
Fannkuch11              4.39s × (1.00,1.01)   4.41s × (1.00,1.01)  +0.52% (p=0.015)
FmtFprintfEmpty        90.8ns × (0.97,1.05)  89.4ns × (0.94,1.13)    ~    (p=0.571)
FmtFprintfString        305ns × (0.99,1.01)   292ns × (0.98,1.05)  -4.35% (p=0.000)
FmtFprintfInt           278ns × (0.96,1.03)   279ns × (0.98,1.04)    ~    (p=0.741)
FmtFprintfIntInt        489ns × (0.99,1.02)   482ns × (0.98,1.03)  -1.43% (p=0.024)
FmtFprintfPrefixedInt   402ns × (0.98,1.02)   395ns × (0.98,1.03)  -1.67% (p=0.014)
FmtFprintfFloat         578ns × (1.00,1.00)   569ns × (0.99,1.01)  -1.48% (p=0.000)
FmtManyArgs            1.88µs × (0.99,1.01)  1.88µs × (1.00,1.01)    ~    (p=0.055)
GobDecode              15.3ms × (0.99,1.01)  15.2ms × (1.00,1.01)  -0.61% (p=0.007)
GobEncode              11.8ms × (0.98,1.05)  11.6ms × (0.99,1.01)    ~    (p=0.075)
Gzip                    647ms × (0.99,1.01)   647ms × (1.00,1.00)    ~    (p=0.790)
Gunzip                  143ms × (1.00,1.00)   142ms × (1.00,1.00)    ~    (p=0.370)
HTTPClientServer       91.2µs × (0.99,1.01)  91.7µs × (0.99,1.02)    ~    (p=0.233)
JSONEncode             31.5ms × (0.98,1.01)  31.8ms × (0.99,1.02)  +1.09% (p=0.015)
JSONDecode              110ms × (0.99,1.01)   110ms × (0.99,1.02)    ~    (p=0.577)
Mandelbrot200          6.00ms × (1.00,1.00)  6.02ms × (1.00,1.00)  +0.24% (p=0.001)
GoParse                6.68ms × (0.98,1.02)  6.61ms × (0.99,1.01)  -1.10% (p=0.027)
RegexpMatchEasy0_32     162ns × (1.00,1.00)   161ns × (1.00,1.01)  -0.66% (p=0.001)
RegexpMatchEasy0_1K     539ns × (1.00,1.00)   539ns × (0.99,1.01)    ~    (p=0.509)
RegexpMatchEasy1_32     140ns × (0.99,1.02)   139ns × (0.99,1.02)    ~    (p=0.163)
RegexpMatchEasy1_1K     886ns × (1.00,1.00)   887ns × (1.00,1.00)    ~    (p=0.408)
RegexpMatchMedium_32    252ns × (1.00,1.00)   255ns × (0.99,1.01)  +1.01% (p=0.000)
RegexpMatchMedium_1K   72.6µs × (1.00,1.00)  72.6µs × (1.00,1.00)    ~    (p=0.176)
RegexpMatchHard_32     3.84µs × (1.00,1.00)  3.84µs × (1.00,1.00)    ~    (p=0.403)
RegexpMatchHard_1K      117µs × (1.00,1.00)   117µs × (1.00,1.00)    ~    (p=0.351)
Revcomp                 926ms × (0.99,1.01)   925ms × (0.99,1.01)    ~    (p=0.541)
Template                126ms × (0.99,1.02)   130ms × (0.99,1.01)  +3.42% (p=0.000)
TimeParse               632ns × (0.99,1.01)   626ns × (1.00,1.00)  -0.88% (p=0.000)
TimeFormat              658ns × (0.99,1.01)   662ns × (0.99,1.02)    ~    (p=0.111)

The effect of this CL combined with CL 9886:

name                   old mean              new mean              delta
BinaryTree17            5.90s × (0.98,1.03)   5.95s × (0.98,1.02)    ~    (p=0.175)
Fannkuch11              4.34s × (1.00,1.00)   4.41s × (1.00,1.01)  +1.69% (p=0.000)
FmtFprintfEmpty        87.3ns × (0.97,1.17)  89.4ns × (0.94,1.13)    ~    (p=0.499)
FmtFprintfString        288ns × (0.98,1.04)   292ns × (0.98,1.05)    ~    (p=0.292)
FmtFprintfInt           290ns × (0.98,1.05)   279ns × (0.98,1.04)  -3.76% (p=0.001)
FmtFprintfIntInt        493ns × (0.98,1.04)   482ns × (0.98,1.03)  -2.27% (p=0.017)
FmtFprintfPrefixedInt   399ns × (0.98,1.02)   395ns × (0.98,1.03)    ~    (p=0.159)
FmtFprintfFloat         569ns × (1.00,1.00)   569ns × (0.99,1.01)    ~    (p=0.847)
FmtManyArgs            1.90µs × (0.99,1.03)  1.88µs × (1.00,1.01)  -1.14% (p=0.009)
GobDecode              15.2ms × (1.00,1.01)  15.2ms × (1.00,1.01)    ~    (p=0.170)
GobEncode              11.8ms × (0.99,1.02)  11.6ms × (0.99,1.01)  -1.47% (p=0.003)
Gzip                    649ms × (0.99,1.00)   647ms × (1.00,1.00)    ~    (p=0.200)
Gunzip                  144ms × (0.99,1.01)   142ms × (1.00,1.00)  -1.04% (p=0.000)
HTTPClientServer       91.1µs × (0.98,1.03)  91.7µs × (0.99,1.02)    ~    (p=0.345)
JSONEncode             31.5ms × (0.99,1.01)  31.8ms × (0.99,1.02)  +0.98% (p=0.021)
JSONDecode              110ms × (1.00,1.01)   110ms × (0.99,1.02)    ~    (p=0.259)
Mandelbrot200          6.02ms × (1.00,1.01)  6.02ms × (1.00,1.00)    ~    (p=0.500)
GoParse                6.68ms × (1.00,1.01)  6.61ms × (0.99,1.01)  -1.17% (p=0.001)
RegexpMatchEasy0_32     161ns × (1.00,1.00)   161ns × (1.00,1.01)  -0.39% (p=0.033)
RegexpMatchEasy0_1K     539ns × (1.00,1.00)   539ns × (0.99,1.01)    ~    (p=0.445)
RegexpMatchEasy1_32     138ns × (1.00,1.01)   139ns × (0.99,1.02)    ~    (p=0.281)
RegexpMatchEasy1_1K     887ns × (1.00,1.01)   887ns × (1.00,1.00)    ~    (p=0.610)
RegexpMatchMedium_32    251ns × (1.00,1.02)   255ns × (0.99,1.01)  +1.42% (p=0.000)
RegexpMatchMedium_1K   72.7µs × (1.00,1.00)  72.6µs × (1.00,1.00)    ~    (p=0.097)
RegexpMatchHard_32     3.85µs × (1.00,1.00)  3.84µs × (1.00,1.00)  -0.31% (p=0.000)
RegexpMatchHard_1K      117µs × (1.00,1.00)   117µs × (1.00,1.00)    ~    (p=0.704)
Revcomp                 923ms × (0.98,1.02)   925ms × (0.99,1.01)    ~    (p=0.574)
Template                126ms × (0.98,1.03)   130ms × (0.99,1.01)  +3.28% (p=0.000)
TimeParse               631ns × (0.99,1.02)   626ns × (1.00,1.00)    ~    (p=0.053)
TimeFormat              660ns × (0.99,1.01)   662ns × (0.99,1.02)    ~    (p=0.398)

Change-Id: I59c03d329fe7bc178a31477c6f1f01062b881041
Reviewed-on: https://go-review.googlesource.com/9993Reviewed-by: Austin Clements <austin@google.com>

Change-Id: I2784f831453d929df64c66febb4982cdf1f08e06
Reviewed-on: https://go-review.googlesource.com/10133Reviewed-by: Minux Ma <minux@golang.org>

According to MSDN RegQueryValueEx page:

  If the data has the REG_SZ, REG_MULTI_SZ or REG_EXPAND_SZ type, the
  string may not have been stored with the proper terminating null
  characters. Therefore, even if the function returns ERROR_SUCCESS, the
  application should ensure that the string is properly terminated before
  using it; otherwise, it may overwrite a buffer. (Note that REG_MULTI_SZ
  strings should have two terminating null characters.)

Test written by Alex Brainman <alex.brainman@gmail.com>

Change-Id: I8c0852e0527e27ceed949134ed5e6de944189986
Reviewed-on: https://go-review.googlesource.com/9806Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>

See CL 9962 for the rationale.

Change-Id: I73c714fce258430eea1e61d3835f5c8e9014ca1f
Signed-off-by: Shenghou Ma <minux@golang.org>
Reviewed-on: https://go-review.googlesource.com/9925Reviewed-by: Ian Lance Taylor <iant@golang.org>