If an illegal header write is detected, find the first caller outside of
net/http using runtime.CallersFrames and include the call site in the log
message.

Fixes #18761

Change-Id: I92be00ac206c6ebdd60344ad7bf40a7c4c188547
Reviewed-on: https://go-review.googlesource.com/c/130997Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Don't worry, this patch just remove trailing whitespace from
assembly files, and does not touch any logical changes.

Change-Id: Ia724ac0b1abf8bc1e41454bdc79289ef317c165d
Reviewed-on: https://go-review.googlesource.com/c/113595Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

When deadline has already passed,
current context is canceled before return cancel function.
So is unnecessary to call cancel with remove from parent again
in return cancel function.

Change-Id: I37c687c57a29d9f139c7fb648ce7de69093ed623
Reviewed-on: https://go-review.googlesource.com/c/50410
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

In some optimization rules the type of generated OffPtr was
incorrectly set to the type of the pointee, instead of the
pointer. When the OffPtr value is spilled, this may generate
a spill of the wrong type, e.g. a floating point spill of an
integer (pointer) value. On Wasm, this leads to invalid
bytecode.

Fixes #27961.

Change-Id: I5d464847eb900ed90794105c0013a1a7330756cc
Reviewed-on: https://go-review.googlesource.com/c/139257
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Richard Musiol <neelance@gmail.com>

p = path.Dir(p) converges to either "." or "/". The current
implementation of modload.QueryPackage() has a loop that
terminates only on ".", not "/". This leads to the go command
hanging in an infinite loop if the user manages to supply
a file path starting with "/" as package path.

An example of the issue is if the user (incorrectly) attempts
to use an absolute directory path in an import statement within
a module (import "/home/bob/myproj") and then runs go list.

Fixes #27558

Change-Id: Iaa6a4f7b05eba30609373636e50224ae2e7d6158
GitHub-Last-Rev: 3a70d3a4277395c2dd8bb50f61b1ac3e44caee28
GitHub-Pull-Request: golang/go#27976
Reviewed-on: https://go-review.googlesource.com/c/139098
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>

This commit adds AIX operating system to cmd/dist package for ppc64
architecture.

The stack guard is increased because of syscalls made inside the runtime
which need a larger stack.

Disable cmd/vet/all tests until aix/ppc64 is fully available.

Change-Id: I7e3caf86724249ae564a152d90c1cbd4de288814
Reviewed-on: https://go-review.googlesource.com/c/138715
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

This will clarify that the resources are not completely pushed yet when `Push` returns and that it starts a separate goroutine. This might be implementation dependant but as I believe there is currently only one implementation it should be added to the documentation of the interface which most people will look up first.

Change-Id: Id151c5563fd0c4e611eb1d93b4f64bf747ddf6d4
GitHub-Last-Rev: 1f46eb9a081f4529abc04026589ffd463be579b3
GitHub-Pull-Request: golang/go#25025
Reviewed-on: https://go-review.googlesource.com/c/108939Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: Ie7f6592d726eba73a5e6b3203e083bff55ff8e4e
GitHub-Last-Rev: 4e317b39dd337f95aa7b7f321906e69a2c14b84e
GitHub-Pull-Request: golang/go#27977
Reviewed-on: https://go-review.googlesource.com/c/139100Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

In the arm assembler, "AMOVW" never falls into optab
case 13, so the check "if p.As == AMOVW" is useless.

Change-Id: Iec241d5b4cffb358a1477f470619dc9a6287884a
Reviewed-on: https://go-review.googlesource.com/c/138575
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

WebSockets requires HTTP/1 in practice (no spec or implementations
work over HTTP/2), so if we get an HTTP request that looks like it's
trying to initiate WebSockets, use HTTP/1, like browsers do.

This is part of a series of commits to make WebSockets work over
httputil.ReverseProxy. See #26937.

Updates #26937

Change-Id: I6ad3df9b0a21fddf62fa7d9cacef48e7d5d9585b
Reviewed-on: https://go-review.googlesource.com/c/137437
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

When http2 fails with ErrNoCachedConn the request is retried with body
that has already been read.

Fixes #25009

Change-Id: I51ed5c8cf469dd8b17c73fff6140ab80162bf267
Reviewed-on: https://go-review.googlesource.com/c/131755
Run-TryBot: Iskander Sharipov <iskander.sharipov@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Now that we do no mark work during mark termination, we no longer need
the gchelper mechanism.

Updates #26903.
Updates #17503.

Change-Id: Ie94e5c0f918cfa047e88cae1028fece106955c1b
Reviewed-on: https://go-review.googlesource.com/c/134785
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>

Before STW and concurrent GC were unified, there could be either one
or two root marking passes per GC cycle. There were several tasks we
had to make sure happened once and only once (whether that was at the
beginning of concurrent mark for concurrent GC or during mark
termination for STW GC). We kept track of this in work.markrootdone.

Now that STW and concurrent GC both use the concurrent marking code
and we've eliminated all work done by the second root marking pass, we
only ever need a single root marking pass. Hence, we can eliminate
work.markrootdone and all of the code that's conditional on it.

Updates #26903.

Change-Id: I654a0f5e21b9322279525560a31e64b8d33b790f
Reviewed-on: https://go-review.googlesource.com/c/134784
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>

Currently, all mcaches are flushed during STW mark termination as a
root marking job. This is currently necessary because all spans must
be out of these caches before sweeping begins to avoid races with
allocation and to ensure the spans are in the state expected by
sweeping. We do it as a root marking job because mcache flushing is
somewhat expensive and O(GOMAXPROCS) and this parallelizes the work
across the Ps. However, it's also the last remaining root marking job
performed during mark termination.

This CL moves mcache flushing out of mark termination and performs it
lazily. We keep track of the last sweepgen at which each mcache was
flushed and as each P is woken from STW, it observes that its mcache
is out-of-date and flushes it.

The introduces a complication for spans cached in stale mcaches. These
may now be observed by background or proportional sweeping or when
attempting to add a finalizer, but aren't in a stable state. For
example, they are likely to be on the wrong mcentral list. To fix
this, this CL extends the sweepgen protocol to also capture whether a
span is cached and, if so, whether or not its cache is stale. This
protocol blocks asynchronous sweeping from touching cached spans and
makes it the responsibility of mcache flushing to sweep the flushed
spans.

This eliminates the last mark termination root marking job, which
means we can now eliminate that entire infrastructure.

Updates #26903. This implements lazy mcache flushing.

Change-Id: Iadda7aabe540b2026cffc5195da7be37d5b4125e
Reviewed-on: https://go-review.googlesource.com/c/134783
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>

Now work.helperDrainBlock is always false, so we can remove it and
code paths that only ran when it was true. That means we no longer use
the gcDrainBlock mode of gcDrain, so we can eliminate that. That means
we no longer use gcWork.get, so we can eliminate that. That means we
no longer use getfull, so we can eliminate that.

Updates #26903. This is a follow-up to unifying STW GC and concurrent GC.

Change-Id: I8dbcf8ce24861df0a6149e0b7c5cd0eadb5c13f6
Reviewed-on: https://go-review.googlesource.com/c/134782
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>

Now that STW GC marking is unified with concurrent marking, there
should never be mark work remaining in mark termination. Hence, we can
make that check unconditional.

Updates #26903. This is a follow-up to unifying STW GC and concurrent GC.

Change-Id: I43a21df5577635ab379c397a7405ada68d331e03
Reviewed-on: https://go-review.googlesource.com/c/134781
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>

Currently, STW GC works very differently from concurrent GC. The
largest differences in that in concurrent GC, all marking work is done
by background mark workers during the mark phase, while in STW GC, all
marking work is done by gchelper during the mark termination phase.

This is a consequence of the evolution of Go's GC from a STW GC by
incrementally moving work from STW mark termination into concurrent
mark. However, at this point, the STW code paths exist only as a
debugging mode. Having separate code paths for this increases the
maintenance burden and complexity of the garbage collector. At the
same time, these code paths aren't tested nearly as well, making it
far more likely that they will bit-rot.

This CL reverses the relationship between STW GC, by re-implementing
STW GC in terms of concurrent GC.

This builds on the new scheduled support for disabling user goroutine
scheduling. During sweep termination, it disables user scheduling, so
when the GC starts the world again for concurrent mark, it's really
only "concurrent" with itself.

There are several code paths that were specific to STW GC that are now
vestigial. We'll remove these in the follow-up CLs.

Updates #26903.

Change-Id: Ia3883d2fcf7ab1d89bdc9c8ee54bf9bffb32c096
Reviewed-on: https://go-review.googlesource.com/c/134780
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>

This adds support for disabling the scheduling of user goroutines
while allowing system goroutines like the garbage collector to
continue running. User goroutines pass through the usual state
transitions, but if we attempt to actually schedule one, it will get
put on a deferred scheduling list.

Updates #26903. This is preparation for unifying STW GC and concurrent
GC.

Updates #25578. This same mechanism can form the basis for disabling
all but a single user goroutine for the purposes of debugger function
call injection.

Change-Id: Ib72a808e00c25613fe6982f5528160d3de3dbbc6
Reviewed-on: https://go-review.googlesource.com/c/134779
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>

Currently, isSystemGoroutine varies on whether it considers the
finalizer goroutine a user goroutine or a system goroutine. For the
next CL, we're going to want to always consider the finalier goroutine
a user goroutine, so add a flag that indicates that.

Updates #26903. This is preparation for unifying STW GC and concurrent
GC.

Change-Id: Iafc92e519c13d9f8d879332cb5f0d12164104c33
Reviewed-on: https://go-review.googlesource.com/c/134778
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>

Currently, setting GODEBUG=gcrescanstacks=1 enables a debugging mode
where the garbage collector re-scans goroutine stacks during mark
termination. This was introduced in Go 1.8 to debug the hybrid write
barrier, but I don't think we ever used it.

Now it's one of the last sources of mark work during mark termination.
This CL removes it.

Updates #26903. This is preparation for unifying STW GC and concurrent
GC.

Updates #17503.

Change-Id: I6ae04d3738aa9c448e6e206e21857a33ecd12acf
Reviewed-on: https://go-review.googlesource.com/c/134777
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>

Currently, checkmarks mode uses the full STW GC infrastructure to
perform mark checking. We're about to remove that infrastructure and,
furthermore, since checkmarks is about doing the simplest thing
possible to check concurrent GC, it's valuable for it to be simpler.

Hence, this CL makes checkmarks even simpler by making it non-parallel
and divorcing it from the STW GC infrastructure (including the
gchelper mechanism).

Updates #26903. This is preparation for unifying STW GC and concurrent
GC.

Change-Id: Iad21158123e025e3f97d7986d577315e994bd43e
Reviewed-on: https://go-review.googlesource.com/c/134776
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>

This argument is always gcBackgroundMode since only
debug.gcstoptheworld can trigger a STW GC at this point. Remove the
unnecessary argument.

Updates #26903. This is preparation for unifying STW GC and concurrent
GC.

Change-Id: Icb4ba8f10f80c2b69cf51a21e04fa2c761b71c94
Reviewed-on: https://go-review.googlesource.com/c/134775
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>

Currently, we disable GC work caching during mark termination. This is
no longer necessary with the new mark completion detection because

1. There's no way for any of the GC mark termination helpers to have
any real work queued and,

2. Mark termination has to explicitly flush every P's buffers anyway
in order to flush Ps that didn't run a GC mark termination helper.

Hence, remove the code that disposes gcWork buffers during mark
termination.

Updates #26903. This is a follow-up to eliminating mark 2.

Change-Id: I81f002ee25d5c10f42afd39767774636519007f9
Reviewed-on: https://go-review.googlesource.com/c/134320
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>

Now that there is no mark 2 phase, gcBlackenPromptly is no longer
used.

Updates #26903. This is a follow-up to eliminating mark 2.

Change-Id: Ib9c534f21b36b8416fcf3cab667f186167b827f8
Reviewed-on: https://go-review.googlesource.com/c/134319
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>

The mark 2 phase was originally introduced as a way to reduce the
chance of entering STW mark termination while there was still marking
work to do. It works by flushing and disabling all local work caches
so that all enqueued work becomes immediately globally visible.
However, mark 2 is not only slow–disabling caches makes marking and
the write barrier both much more expensive–but also imperfect. There
is still a rare but possible race (~once per all.bash) that can cause
GC to enter mark termination while there is still marking work. This
race is detailed at
https://github.com/golang/proposal/blob/master/design/17503-eliminate-rescan.md#appendix-mark-completion-race
The effect of this is that mark termination must still cope with the
possibility that there may be work remaining after a concurrent mark
phase. Dealing with this increases STW pause time and increases the
complexity of mark termination.

Furthermore, a similar but far more likely race can cause early
transition from mark 1 to mark 2. This is unfortunate because it
causes performance instability because of the cost of mark 2.

This CL fixes this by replacing mark 2 with a distributed termination
detection algorithm. This algorithm is correct, so it eliminates the
mark termination race, and doesn't require disabling local caches. It
ensures that there are no grey objects upon entering mark termination.
With this change, we're one step closer to eliminating marking from
mark termination entirely (it's still used by STW GC and checkmarks
mode).

This CL does not eliminate the gcBlackenPromptly global flag, though
it is always set to false now. It will be removed in a cleanup CL.

This led to only minor variations in the go1 benchmarks
(https://perf.golang.org/search?q=upload:20180909.1) and compilebench
benchmarks (https://perf.golang.org/search?q=upload:20180910.2).

This significantly improves performance of the garbage benchmark, with
no impact on STW times:

name                        old time/op    new time/op   delta
Garbage/benchmem-MB=64-12    2.21ms ± 1%   2.05ms ± 1%   -7.38% (p=0.000 n=18+19)
Garbage/benchmem-MB=1024-12  2.30ms ±16%   2.20ms ± 7%   -4.51% (p=0.001 n=20+20)

name                        old STW-ns/GC  new STW-ns/GC  delta
Garbage/benchmem-MB=64-12      138k ±44%     141k ±23%     ~    (p=0.309 n=19+20)
Garbage/benchmem-MB=1024-12    159k ±25%     178k ±98%     ~    (p=0.798 n=16+18)

name                        old STW-ns/op  new STW-ns/op                delta
Garbage/benchmem-MB=64-12     4.42k ±44%    4.24k ±23%     ~    (p=0.531 n=19+20)
Garbage/benchmem-MB=1024-12     591 ±24%      636 ±111%    ~    (p=0.309 n=16+18)

(https://perf.golang.org/search?q=upload:20180910.1)

Updates #26903.
Updates #17503.

Change-Id: Icbd1e12b7a12a76f423c9bf033b13cb363e4cd19
Reviewed-on: https://go-review.googlesource.com/c/134318
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>

Nothing currently consumes the flag, but we'll use it in the
distributed termination detection algorithm.

Updates #26903. This is preparation for eliminating mark 2.

Change-Id: I5e149a05b1c878fe1009150da21f8bd8ae2b9b6a
Reviewed-on: https://go-review.googlesource.com/c/134317
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>

It turns out if you set GODEBUG=gctrace=2, it enables an obscure
debugging mode that, in addition to printing gctrace statistics, also
does a second STW GC following each regular GC. This debugging mode
has long since lost its value (you could maybe use it to analyze
floating garbage, except that we don't print the gctrace line on the
second GC), and it interferes substantially with the operation of the
GC by messing up the statistics used to schedule GCs.

It's also a source of mark termination GC work when we're in
concurrent GC mode, so it's going to interfere with eliminating mark
2. And it's going to get in the way of unifying STW and concurrent GC.

This CL removes this debugging mode.

Updates #26903. This is preparation for eliminating mark 2 and
unifying STW GC and concurrent GC.

Change-Id: Ib5bce05d8c4d5b6559c89a65165d49532165df07
Reviewed-on: https://go-review.googlesource.com/c/134316
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>

Currently, if the gcWork runs out of work, we'll fall out of the GC
worker, even though flushing the write barrier buffer could produce
more work. While this is not a correctness issue, it can lead to
premature mark 2 or mark termination.

Fix this by flushing the write barrier buffer if the local gcWork runs
out of work and then checking the local gcWork again.

This reduces the number of premature mark terminations during all.bash
by about a factor of 10.

Updates #26903. This is preparation for eliminating mark 2.

Change-Id: I48577220b90c86bfd28d498e8603bc379a8cd617
Reviewed-on: https://go-review.googlesource.com/c/134315
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>

Previously the MaxIdleClosed counter was incremented when added
to the free connection list, rather then when it wasn't added
to the free connection list. Flip this logic to correct.

Fixes #27792

Change-Id: I405302c14fb985369dab48fbe845e5651afc4ccf
Reviewed-on: https://go-review.googlesource.com/c/138578
Run-TryBot: Daniel Theophanes <kardianos@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Add SSA rules to intrinsify Mul/Mul64 on ppc64x.

benchmark             old ns/op     new ns/op     delta
BenchmarkMul-40       8.80          0.93          -89.43%
BenchmarkMul32-40     1.39          1.39          +0.00%
BenchmarkMul64-40     5.39          0.93          -82.75%

Updates #24813

Change-Id: I6e95bfbe976a2278bd17799df184a7fbc0e57829
Reviewed-on: https://go-review.googlesource.com/138917Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>

Follow-up on https://golang.org/cl/136397.

Change-Id: Ib0df690847c7c92d8de406dadc16a10507bfda39
Reviewed-on: https://go-review.googlesource.com/c/139059Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Edge supports WebAssembly but not TextEncoder or TextDecoder.
This change adds a comment pointing to a polyfill that could
be used. The polyfill is not added by default, because we want to
let the user decide if/how to include the polyfill.

Fixes #27295

Change-Id: I375f58f2168665f549997b368428c398dfbbca1c
Reviewed-on: https://go-review.googlesource.com/139037Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

This reverts CL 131718, commit a0e7f127.

Reason for revert: adds request overhead & dependency on third-party service for all users regardless of whether it's necessary.

Updates #27295

Change-Id: I4a8a9b0c8e4a3198c884dfbd90ba36734f70a9a9
Reviewed-on: https://go-review.googlesource.com/138937Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Fixes #27923

Change-Id: Ia902a1966beeae56e43265fc5ed987555fa834b6
Reviewed-on: https://go-review.googlesource.com/138677Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Currently there is no example for http.Handle in the
documentation. This adds an example.

Change-Id: I66ee9983bea1f5237757e1ef4956eae9a056e963
Reviewed-on: https://go-review.googlesource.com/137715
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Recent CL 125456 implemented Unix Socket functionality on windows.
But that functionality does not appear to be working when 32-bit
code is used. So disable TestUnixConnLocalWindows.

windows/386 builder does not appear to be complaining about
TestUnixConnLocalWindows, because new functionality requires
Windows 10 Build 17063. windows/386 builder uses Windows 2008.

Fixes #27943

Change-Id: Iea91b86aaa124352d198ca0cd03fff1e7542f949
Reviewed-on: https://go-review.googlesource.com/138676
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Yasuhiro MATSUMOTO <mattn.jp@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

dump/fdump is a reflection-based data structure dumper slightly
customized for the compiler's Node data structure. It dumps the
transitivle closure of Node (and other) data structures using a
recursive descent depth first traversal and permits filtering
options (recursion depth limitation, filtering of struct fields).

I have been using it to diagnose compiler bugs and found it more
useful than the existing node printing code in some cases because
field filtering reduces the output to the interesting parts.

No impact on rest of compiler if functions are not called (which
they only should during a debugging session).

Change-Id: I79d7227f10dd78dbd4bbcdf204db236102fc97a7
Reviewed-on: https://go-review.googlesource.com/136397Reviewed-by: Alan Donovan <adonovan@google.com>

Change-Id: I2f1a55e15dc5737a5a06bd894c46b2c4705f338c
Reviewed-on: https://go-review.googlesource.com/138858Reviewed-by: Filippo Valsorda <filippo@golang.org>

Previously, some of output from gdb matched with literal string, while
gdb v8.2 print the address of variable (e.g. map key and value) in
output.

This commit fix the regex in testing the output.

Fixes #27608

Change-Id: Ic3fe8280b9f93fda2799116804822616caa66beb
Reviewed-on: https://go-review.googlesource.com/135055
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>

Use a subslice of the pixel data to give the compiler hints
for bounds checking. Only do this for image formats that
require 4 or more slice reads/writes.

See #27857 for discussion of small cap sizes.

name                   old time/op    new time/op    delta
At/rgba-8              18.8ns ± 2%    18.5ns ± 1%   -1.49%  (p=0.026 n=10+10)
At/rgba64-8            22.2ns ± 2%    21.1ns ± 3%   -4.51%  (p=0.000 n=10+10)
At/nrgba-8             18.8ns ± 2%    18.7ns ± 2%     ~     (p=0.467 n=10+10)
At/nrgba64-8           21.9ns ± 2%    21.0ns ± 2%   -4.15%  (p=0.000 n=10+9)
At/alpha-8             14.3ns ± 1%    14.3ns ± 2%     ~     (p=0.543 n=10+10)
At/alpha16-8           6.43ns ± 1%    6.47ns ± 1%     ~     (p=0.053 n=10+10)
At/gray-8              14.4ns ± 2%    14.6ns ± 5%     ~     (p=0.194 n=10+10)
At/gray16-8            6.52ns ± 1%    6.55ns ± 2%     ~     (p=0.610 n=10+10)
At/paletted-8          4.17ns ± 1%    4.21ns ± 2%     ~     (p=0.095 n=9+10)
Set/rgba-8             39.2ns ± 2%    40.1ns ± 4%   +2.45%  (p=0.007 n=10+10)
Set/rgba64-8           46.2ns ± 3%    43.3ns ± 3%   -6.11%  (p=0.000 n=10+10)
Set/nrgba-8            39.2ns ± 1%    39.7ns ± 5%     ~     (p=0.407 n=10+10)
Set/nrgba64-8          45.6ns ± 3%    42.9ns ± 3%   -5.83%  (p=0.000 n=9+10)
Set/alpha-8            35.0ns ± 3%    34.1ns ± 2%   -2.43%  (p=0.017 n=10+10)
Set/alpha16-8          36.3ns ± 4%    35.8ns ± 5%     ~     (p=0.254 n=10+10)
Set/gray-8             19.8ns ± 1%    19.7ns ± 0%   -0.69%  (p=0.002 n=8+6)
Set/gray16-8           36.0ns ± 1%    36.4ns ± 2%   +1.08%  (p=0.037 n=10+10)
Set/paletted-8         39.1ns ± 0%    39.6ns ± 1%   +1.30%  (p=0.000 n=10+10)
RGBAAt-8               3.72ns ± 1%    3.58ns ± 1%   -3.76%  (p=0.000 n=9+10)
RGBASetRGBA-8          4.35ns ± 1%    3.70ns ± 1%  -14.92%  (p=0.000 n=10+10)
RGBA64At-8             5.08ns ± 1%    3.69ns ± 1%  -27.40%  (p=0.000 n=9+9)
RGBA64SetRGBA64-8      6.65ns ± 2%    3.63ns ± 0%  -45.35%  (p=0.000 n=10+9)
NRGBAAt-8              3.72ns ± 1%    3.59ns ± 1%   -3.55%  (p=0.000 n=10+10)
NRGBASetNRGBA-8        4.05ns ± 0%    3.71ns ± 1%   -8.57%  (p=0.000 n=9+10)
NRGBA64At-8            4.99ns ± 1%    3.69ns ± 0%  -26.07%  (p=0.000 n=10+9)
NRGBA64SetNRGBA64-8    6.66ns ± 1%    3.64ns ± 1%  -45.40%  (p=0.000 n=10+10)
AlphaAt-8              1.44ns ± 1%    1.44ns ± 0%     ~     (p=0.176 n=10+7)
AlphaSetAlpha-8        1.60ns ± 2%    1.56ns ± 0%   -2.62%  (p=0.000 n=10+6)
Alpha16At-8            2.87ns ± 1%    2.92ns ± 2%   +1.67%  (p=0.001 n=10+10)
AlphaSetAlpha16-8      3.26ns ± 1%    3.35ns ± 1%   +2.68%  (p=0.012 n=8+3)

Fixes #14884

Change-Id: Ia0383530596a550e1b1c7aafce5220e5e0935a53
Reviewed-on: https://go-review.googlesource.com/137495Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>