This broke solaris, which apparently does use the upper 17 bits of the address space.
This reverts commit 3b02c5b1b6.
Change-Id: Iedfe54abd0384960845468205f20191a97751c0b
Reviewed-on: https://go-review.googlesource.com/21652
Reviewed-by: Dave Cheney <dave@cheney.net>
Fold the comparison when the SHR result is small.
Useful for:
- murmur mix like hashing where higher bits are desirable, i.e. hash = uint32(i * C) >> 18
- integer log2 via DeBruijn sequence: http://graphics.stanford.edu/~seander/bithacks.html#IntegerLogDeBruijn
Change-Id: If70ae18cb86f4cc83ab6213f88ced03cc4986156
Reviewed-on: https://go-review.googlesource.com/21514
Run-TryBot: Alexandru Moșoi <alexandru@mosoi.ro>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
The test for profiling of channel blocking is timing dependent,
and in particular the blockSelectRecvAsync case can fail on a
slow builder (plan9_arm) when many tests are run in parallel.
The child goroutine sleeps for a fixed period so the parent
can be observed to block in a select call reading from the
child; but if the OS process running the parent goroutine is
delayed long enough, the child may wake again before the
parent has reached the blocking point. By repeating the test
three times, the likelihood of a blocking event is increased.
Fixes#15096
Change-Id: I2ddb9576a83408d06b51ded682bf8e71e53ce59e
Reviewed-on: https://go-review.googlesource.com/21604
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Run-TryBot: Dmitry Vyukov <dvyukov@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Merge the remaining lfstack{Pack,Unpack} implemetations into one file.
unsafe.Sizeof(uintptr(0)) == 4 is a constant comparison so this branch
folds away at compile time.
Dmitry confirmed that the upper 17 bits of an address will be zero for a
user mode pointer, so there is no need to sign extend on amd64 during
unpack, so we can reuse the same implementation as all othe 64 bit
archs.
Change-Id: I99f589416d8b181ccde5364c9c2e78e4a5efc7f1
Reviewed-on: https://go-review.googlesource.com/21597
Run-TryBot: Dave Cheney <dave@cheney.net>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>
API could still be made more Go-ey.
Updates #15165.
Change-Id: I514ffceffa43c293ae5d7e5f1e9193fda0098865
Reviewed-on: https://go-review.googlesource.com/21644
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Two of these error messages are already dead code: cmd/compile.main
and cmd/link.main already switch on $GOARCH, ensuring it must be a
prefix of the sys.Arch.Family.
The error message about uncompiled Go source files can be just be
simplified: anyone who's manually constructing Go object file archives
probably knows what tool to use to compile Go source files.
Change-Id: Ia4a67c0a1d1158379c127c91e909226d3367f3c2
Reviewed-on: https://go-review.googlesource.com/21626
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Information about CPU architectures (e.g., name, family, byte
ordering, pointer and register size) is currently redundantly
scattered around the source tree. Instead consolidate the basic
information into a single new package cmd/internal/sys.
Also, introduce new sys.I386, sys.AMD64, etc. names for the constants
'8', '6', etc. and replace most uses of the latter. The notable
exceptions are a couple of error messages that still refer to the old
char-based toolchain names and function reltype in cmd/link.
Passes toolstash/buildall.
Change-Id: I8a6f0cbd49577ec1672a98addebc45f767e36461
Reviewed-on: https://go-review.googlesource.com/21623
Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
So that all Go processes do not die on startup on a system with >256 CPUs.
I tested this by hacking osinit to set ncpu to 1000.
Updates #15131
Change-Id: I52e061a0de97be41d684dd8b748fa9087d6f1aef
Reviewed-on: https://go-review.googlesource.com/21599
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This updates dwarf.go to generate debug information as symbols
instead of directly writing to the output file. This should make
it easier to move generation of some of the debug info into the compiler.
Change-Id: Id2358988bfb689865ab4d68f82716f0676336df4
Reviewed-on: https://go-review.googlesource.com/20679
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Relatively few types are ever used as map keys,
so tracking this separately is a net win.
Passes toolstash -cmp.
name old alloc/op new alloc/op delta
Template 55.9MB ± 0% 55.5MB ± 0% -0.71% (p=0.000 n=10+10)
Unicode 37.8MB ± 0% 37.7MB ± 0% -0.27% (p=0.000 n=10+10)
GoTypes 180MB ± 0% 179MB ± 0% -0.52% (p=0.000 n=7+10)
Compiler 806MB ± 0% 803MB ± 0% -0.41% (p=0.000 n=10+10)
CPU and number of allocs are unchanged.
Change-Id: I6d60d74a4866995a231dfed3dd5792d75d904292
Reviewed-on: https://go-review.googlesource.com/21622
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This function is present in the strings package but missing from bytes,
and we would like to keep the two packages consistent.
Add it to bytes, and copy the test over as well.
Fixes#15140
Change-Id: I5dbd28da83a9fe741885794ed15f2af2f826cb3c
Reviewed-on: https://go-review.googlesource.com/21562
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
None of the two places that call lfstackUnpack use the second argument.
This simplifies a followup CL that merges the lfstack{Pack,Unpack}
implementations.
Change-Id: I3c93f6259da99e113d94f8c8027584da79c1ac2c
Reviewed-on: https://go-review.googlesource.com/21595
Run-TryBot: Dave Cheney <dave@cheney.net>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Where possible replace ANDQ with MOV?ZX.
Takes care that we don't regress wrt bounds checking,
for example [1000]int{}[i&255].
According to "Intel 64 and IA-32 Architectures Optimization Reference
Manual" Section: "3.5.1.13 Zero-Latency MOV Instructions"
MOV?ZX instructions have zero latency on newer processors.
Updates #15105
Change-Id: I63539fdbc5812d5563aa1ebc49eca035bd307997
Reviewed-on: https://go-review.googlesource.com/21508
Reviewed-by: Айнар Гарипов <gugl.zadolbal@gmail.com>
Reviewed-by: David Chase <drchase@google.com>
Flaky tests are a distraction and cover up real problems.
File bugs instead and mark them as flaky.
This moves the net/http flaky test flagging mechanism to internal/testenv.
Updates #15156
Updates #15157
Updates #15158
Change-Id: I0e561cd2a09c0dec369cd4ed93bc5a2b40233dfe
Reviewed-on: https://go-review.googlesource.com/21614
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Many of Type's fields are etype-specific.
This CL organizes them into their own auxiliary types,
duplicating a few fields as necessary,
and adds an Extra field to hold them.
It also sorts the remaining fields for better struct packing.
It also improves documentation for most fields.
This reduces the size of Type at the cost of some extra allocations.
There's no CPU impact; memory impact below.
It also makes the natural structure of Type clearer.
Passes toolstash -cmp on all architectures.
Ideas for future work in this vein:
(1) Width and Align probably only need to be
stored for Struct and Array types.
The refactoring to accomplish this would hopefully
also eliminate TFUNCARGS and TCHANARGS entirely.
(2) Maplineno is sparsely used and could probably better be
stored in a separate map[*Type]int32, with mapqueue updated
to store both a Node and a line number.
(3) The Printed field may be removable once the old (non-binary)
importer/exported has been removed.
(4) StructType's fields field could be changed from *[]*Field to []*Field,
which would remove a common allocation.
(5) I believe that Type.Nod can be moved to ForwardType. Separate CL.
name old alloc/op new alloc/op delta
Template 57.9MB ± 0% 55.9MB ± 0% -3.43% (p=0.000 n=50+50)
Unicode 38.3MB ± 0% 37.8MB ± 0% -1.39% (p=0.000 n=50+50)
GoTypes 185MB ± 0% 180MB ± 0% -2.56% (p=0.000 n=50+50)
Compiler 824MB ± 0% 806MB ± 0% -2.19% (p=0.000 n=50+50)
name old allocs/op new allocs/op delta
Template 486k ± 0% 497k ± 0% +2.25% (p=0.000 n=50+50)
Unicode 377k ± 0% 379k ± 0% +0.55% (p=0.000 n=50+50)
GoTypes 1.39M ± 0% 1.42M ± 0% +1.63% (p=0.000 n=50+50)
Compiler 5.52M ± 0% 5.57M ± 0% +0.84% (p=0.000 n=47+50)
Change-Id: I828488eeb74902b013d5ae4cf844de0b6c0dfc87
Reviewed-on: https://go-review.googlesource.com/21611
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
A dot-import cannot possibly introduce a `len` function since that
function would not be exported (it's lowercase). Furthermore, the
existing code already (incorrectly) assumed that there was no other
`len` function in another file of the package. Since this has been
an ok assumption for years, let's leave it, but remove the dot-import
restriction.
Fixes#15153.
Change-Id: I18fbb27acc5a5668833b4b4aead0cca540862b52
Reviewed-on: https://go-review.googlesource.com/21613
Reviewed-by: Alan Donovan <adonovan@google.com>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
- Automatically determine the first argument to check.
- Skip checking matching non-variadic functions.
- Skip checking matching functions accepting non-interface{}
variadic arguments.
- Removed fragile 'magic' code for special cases such as math.Log
and error interface.
Fixes#15067Fixes#15099
Change-Id: Ib313557f18b12b36daa493f4b02c598b9503b55b
Reviewed-on: https://go-review.googlesource.com/21513
Run-TryBot: Rob Pike <r@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
We already have variables to track whether the target platform is
64-bit vs 32-bit or RELA vs REL, so no point in repeating the list of
obscure architecture characters everywhere.
Passes toolstash/buildall.
Change-Id: I6a07f74188ac592ef229a7c65848a9ba93013cdb
Reviewed-on: https://go-review.googlesource.com/21569
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Even with -D_POSIX_PTHREAD_SEMANTICS, Solaris seems to not define
getgrnam_r in a POSIX compatible way.
Fixes#14967
Change-Id: I78cb7e5b30b2d8b860e336060a0a06f4720c0475
Reviewed-on: https://go-review.googlesource.com/21385
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
No point in doing anything for x=x assignments.
In addition, skipping these assignments prevents generating:
VARDEF x
COPY x -> x
which is bad because x is incorrectly considered
dead before the vardef.
Fixes#14904
Change-Id: I6817055ec20bcc34a9648617e0439505ee355f82
Reviewed-on: https://go-review.googlesource.com/21470
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Dave Cheney <dave@cheney.net>
Merge all the 64bit lfstack impls into one file, adjust build tags to
match.
Merge all the comments on the various lfstack implementations for
posterity.
lfstack_amd64.go can probably be merged, but it is slightly different so
that will happen in a followup.
Change-Id: I5362d5e127daa81c9cb9d4fa8a0cc5c5e5c2707c
Reviewed-on: https://go-review.googlesource.com/21591
Run-TryBot: Dave Cheney <dave@cheney.net>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>
A future CL will rename os1_windows.go to os_windows.go.
Change-Id: I223e76002dd1e9c9d1798fb0beac02c7d3bf4812
Reviewed-on: https://go-review.googlesource.com/21564
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>
ReadAtSizer is a common abstraction for a stateless,
concurrently-readable fixed number of bytes.
This interface has existed in various codebases for over 3 years (previously
usually named SizeReaderAt). It is used inside Google in dl.google.com
(mentioned in https://talks.golang.org/2013/oscon-dl.slide) and other
packages. It is used in Camlistore, in Juju, in the Google API Go client, in
github.com/nightlyone/views, and 33 other pages of Github search results.
It is implemented by io.SectionReader, bytes.Reader, strings.Reader, etc.
Time to finally promote this interface to the standard library and give it a
standard name, blessing it as best practice.
Updates #7263
Updates #14889
Change-Id: Id28c0cafa7d2d37e8887c54708b5daf1b11c83ea
Reviewed-on: https://go-review.googlesource.com/21492
Reviewed-by: Rob Pike <r@golang.org>
Changes generated with eg and then manually
checked and in some cases simplified.
Passes toolstash -cmp.
Change-Id: I2119f37f003368ce1884d2863b406d6ffbfe38c7
Reviewed-on: https://go-review.googlesource.com/21563
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Also, don't read from the Request.Headers in the http Server code once
ServeHTTP has started. This is partially redundant with documenting
that handlers shouldn't mutate request, but: the space is free due to
bool packing, it's faster to do the checks once instead of N times in
writeChunk, and it's a little nicer to code which previously didn't
play by the unwritten rules. But I'm not going to fix all the cases.
Fixes#14940
Change-Id: I612a8826b41c8682b59515081c590c512ee6949e
Reviewed-on: https://go-review.googlesource.com/21530
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>
go.go is currently a grab bag of various unrelated type and variable
declarations. Move a bunch of them into other more relevant source
files.
There are still more that can be moved, but these were the low hanging
fruit with obvious homes.
No code/comment changes. Just shuffling stuff around.
Change-Id: I43dbe1a5b8b707709c1a3a034c693d38b8465063
Reviewed-on: https://go-review.googlesource.com/21561
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This introduces a few changes
- Skipped benchmarks now print a SKIP line, also if there was
no output
- The benchmark name is only printed if there the benchmark
was not skipped or did not fail in the probe phase.
It also fixes a bug of doubling a skip message in chatty mode in
absense of a failure.
The chatty flag is now passed in the common struct to allow
for testing of the printed messages.
Fixes#14799
Change-Id: Ia8eb140c2e5bb467e66b8ef20a2f98f5d95415d5
Reviewed-on: https://go-review.googlesource.com/21504
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
CL/19862 introduced the same set of constants to the io package.
We should steer users away from the os.SEEK* versions and towards
the io.Seek* versions.
Updates #6885
Change-Id: I96ec5be3ec3439e1295c937159dadaf1ebfb2737
Reviewed-on: https://go-review.googlesource.com/21540
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
I think we had this code before but it may have gone lost somehow.
Change-Id: Ifde490e686de0d2bfe907cbe19c9197f24f5fa8e
Reviewed-on: https://go-review.googlesource.com/21537
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Missed a case for closure calls (OCALLFUNC && indirect) in
esc.go:esccall.
Cleanup to runtime code for windows to more thoroughly hide
a technical escape. Also made code pickier about failing
to late non-optional kernel32.dll.
Fixes#14409.
Change-Id: Ie75486a2c8626c4583224e02e4872c2875f7bca5
Reviewed-on: https://go-review.googlesource.com/20102
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Usleep(100) in runqgrab negatively affects latency and throughput
of parallel application. We are sleeping instead of doing useful work.
This is effect is particularly visible on windows where minimal
sleep duration is 1-15ms.
Reduce sleep from 100us to 3us and use osyield on windows.
Sync chan send/recv takes ~50ns, so 3us gives us ~50x overshoot.
benchmark old ns/op new ns/op delta
BenchmarkChanSync-12 216 217 +0.46%
BenchmarkChanSyncWork-12 27213 25816 -5.13%
CPU consumption goes up from 106% to 108% in the first case,
and from 107% to 125% in the second case.
Test case from #14790 on windows:
BenchmarkDefaultResolution-8 4583372 29720 -99.35%
Benchmark1ms-8 992056 30701 -96.91%
99-th latency percentile for HTTP request serving is improved by up to 15%
(see http://golang.org/cl/20835 for details).
The following benchmarks are from the change that originally added this sleep
(see https://golang.org/s/go15gomaxprocs):
name old time/op new time/op delta
Chain 22.6µs ± 2% 22.7µs ± 6% ~ (p=0.905 n=9+10)
ChainBuf 22.4µs ± 3% 22.5µs ± 4% ~ (p=0.780 n=9+10)
Chain-2 23.5µs ± 4% 24.9µs ± 1% +5.66% (p=0.000 n=10+9)
ChainBuf-2 23.7µs ± 1% 24.4µs ± 1% +3.31% (p=0.000 n=9+10)
Chain-4 24.2µs ± 2% 25.1µs ± 3% +3.70% (p=0.000 n=9+10)
ChainBuf-4 24.4µs ± 5% 25.0µs ± 2% +2.37% (p=0.023 n=10+10)
Powser 2.37s ± 1% 2.37s ± 1% ~ (p=0.423 n=8+9)
Powser-2 2.48s ± 2% 2.57s ± 2% +3.74% (p=0.000 n=10+9)
Powser-4 2.66s ± 1% 2.75s ± 1% +3.40% (p=0.000 n=10+10)
Sieve 13.3s ± 2% 13.3s ± 2% ~ (p=1.000 n=10+9)
Sieve-2 7.00s ± 2% 7.44s ±16% ~ (p=0.408 n=8+10)
Sieve-4 4.13s ±21% 3.85s ±22% ~ (p=0.113 n=9+9)
Fixes#14790
Change-Id: Ie7c6a1c4f9c8eb2f5d65ab127a3845386d6f8b5d
Reviewed-on: https://go-review.googlesource.com/20835
Reviewed-by: Austin Clements <austin@google.com>
We already generate ADDL for byte operations, reflect this in code.
This also allows inc/dec for +-1 operation, which are 1-byte shorter,
and enables lea for 3-operand addition/subtraction.
Change-Id: Ibfdfee50667ca4cd3c28f72e3dece0c6d114d3ae
Reviewed-on: https://go-review.googlesource.com/21251
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Ilya Tocar <ilya.tocar@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This CL allows JSON-encoding & -decoding maps whose keys are types that
implement encoding.TextMarshaler / TextUnmarshaler.
During encode, the map keys are marshaled upfront so that they can be
sorted.
Fixes#12146
Change-Id: I43809750a7ad82a3603662f095c7baf75fd172da
Reviewed-on: https://go-review.googlesource.com/20356
Run-TryBot: Caleb Spare <cespare@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Since BCE happens over several passes (opt, loopbce, prove)
it's easy to regress especially with rewriting.
The pass is only activated with special debug flag.
Change-Id: I46205982e7a2751156db8e875d69af6138068f59
Reviewed-on: https://go-review.googlesource.com/21510
Run-TryBot: Alexandru Moșoi <alexandru@mosoi.ro>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Go 1.6's HTTP/1.x Transport started enforcing that responses have 3
status digits, per the spec, but we could still write out invalid
status codes ourselves if the called
ResponseWriter.WriteHeader(0). That is bogus anyway, since the minimum
status code is 1xx, but be a little bit less bogus (and consistent)
and zero pad our responses.
Change-Id: I6883901fd95073cb72f6b74035cabf1a79c35e1c
Reviewed-on: https://go-review.googlesource.com/19130
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>
This fixes a race which made it possible to cancel a connection after
returning from net.Dial.
Fixes#15035Fixes#15078
Change-Id: Iec6215009538362f7ad9f408a33549f3e94d1606
Reviewed-on: https://go-review.googlesource.com/21497
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Currently only used by the client. The server is not yet wired up. A
TODO remains to document how it works server-side, once implemented.
Updates #14660
Change-Id: I27c2e74198872b2720995fa8271d91de200e23d5
Reviewed-on: https://go-review.googlesource.com/21496
Reviewed-by: Andrew Gerrand <adg@golang.org>
Current implementation uses GetShortPathName and GetLongPathName
to get a normalized path. That approach sometimes fails because
user can disable short path name anytime. This CL provides
an alternative approach suggested by MSDN.
https://msdn.microsoft.com/en-us/library/windows/desktop/aa364989(v=vs.85).aspxFixes#13980
Change-Id: Icf4afe4c9c4b507fc110c1483bf8db2c3f606b0a
Reviewed-on: https://go-review.googlesource.com/20860
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This copies the golang.org/x/net/context package to the standard library.
It is imported from the x/net repo's git rev 1d9fd3b8333e (the most
recent modified to x/net/context as of 2016-03-07).
The corresponding change to x/net/context is in https://golang.org/cl/20347
Updates #14660
Change-Id: Ida14b1b7e115194d6218d9ac614548b9f41641cc
Reviewed-on: https://go-review.googlesource.com/20346
Reviewed-by: Sameer Ajmani <sameer@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Briefly document what the importfoo functions do.
Get rid of importsym's unused result parameter.
Get rid of the redundant calls to importsym(s, OTYPE)
after we've already called pkgtype(s).
Passes toolstash -cmp.
Change-Id: I4c057358144044f5356e4dec68907ec85f1fe806
Reviewed-on: https://go-review.googlesource.com/21498
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Counting the final buffer size usually doesn't result in the buffer growing,
so assume that it doesn't need to grow and only grow if necessary.
name old secs new secs delta
LinkCmdGo 0.49 ± 4% 0.48 ± 3% -1.31% (p=0.000 n=95+95)
name old MaxRSS new MaxRSS delta
LinkCmdGo 122k ± 4% 121k ± 5% ~ (p=0.065 n=96+100)
Change-Id: I85e7f5688a61ef5ef2b1b7afe56507e71c5bd5b1
Reviewed-on: https://go-review.googlesource.com/21509
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Shahar Kohanim <skohanim@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Completed implementation for exporting inlined functions
using the new binary export format. This change passes
(export GO_GCFLAGS=-newexport; make all.bash) but for
gc's builtin_test.go which we need to adjust before enabling
this code by default.
For a high-level description of the export format see the
comment at the top of bexport.go.
Major changes:
1) The export format for the platform independent export data
changed: When we export inlined function bodies, additional
objects (other functions, types, etc.) that are referred to
by the function bodies will need to be exported. While this
doesn't affect the platform-independent portion directly, it
adds more objects to the exportlist while we are exporting.
Instead of trying to sort the objects into groups, just export
objects as they appear in the export list. This is slightly
less compact (one extra byte per object), but it is simpler
and much more flexible.
2) The export format contains now three sections: 1) The plat-
form independent objects, 2) the objects pulled in for export
via inlined function bodies, and 3) the inlined function bodies.
3) Completed the exporting and importing code for inlined function
bodies. The format is completely compiler-specific and easily
changeable w/o affecting other tools. There is still quite a
bit of room for denser encoding. This can happen at any time
in the future.
This change contains also the adjustments for go/internal/gcimporter,
necessary because of the export format change 1) mentioned above.
For #13241.
Change-Id: I86bca0bd984b12ccf13d0d30892e6e25f6d04ed5
Reviewed-on: https://go-review.googlesource.com/21172
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
by only testing the lower bound of memalloc
Fixes#15063
Change-Id: Iab2fdd75e9ce98c641bfbce57f142fa47176772d
Reviewed-on: https://go-review.googlesource.com/21507
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
In b we only need the division by 0 check.
func b(i uint, v []byte) byte {
return v[i%uint(len(v))]
}
Updates #15079.
Change-Id: Ic7491e677dd57cd6ba577efbce576dbb6e023cbd
Reviewed-on: https://go-review.googlesource.com/21502
Run-TryBot: Alexandru Moșoi <alexandru@mosoi.ro>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Ahmed Waheed <oneofone@gmail.com>
When we grow the heap, we create a temporary "in use" span for the
memory acquired from the OS and then free that span to link it into
the heap. Hence, we (1) increase pagesInUse when we make the temporary
span so that (2) freeing the span will correctly decrease it.
However, currently step (1) increases pagesInUse by the number of
pages requested from the heap, while step (2) decreases it by the
number of pages requested from the OS (the size of the temporary
span). These aren't necessarily the same, since we round up the number
of pages we request from the OS, so steps 1 and 2 don't necessarily
cancel out like they're supposed to. Over time, this can add up and
cause pagesInUse to underflow and wrap around to 2^64. The garbage
collector computes the sweep ratio from this, so if this happens, the
sweep ratio becomes effectively infinite, causing the first allocation
on each P in a sweep cycle to sweep the entire heap. This makes
sweeping effectively STW.
Fix this by increasing pagesInUse in step 1 by the number of pages
requested from the OS, so that the two steps correctly cancel out. We
add a test that checks that the running total matches the actual state
of the heap.
Fixes#15022. For 1.6.x.
Change-Id: Iefd9d6abe37d0d447cbdbdf9941662e4f18eeffc
Reviewed-on: https://go-review.googlesource.com/21280
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
To refer to types and names by offsets, we want to keep the symbols in
the same sections. Do this by making all types .relro for now.
Once name offsets are further along, name data can move out of relro.
Change-Id: I1cbd2e914bd180cdf25c4aeb13d9c1c734febe69
Reviewed-on: https://go-review.googlesource.com/21394
Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Identify this assignment case and instead of the more general error
prog.go:6: cannot assign to students["sally"].age (value of type int)
produce
prog.go:6: cannot directly assign to struct field students["sally"].age in map
that explains why the assignment is not possible. Used ExprString
instead of String of operand since the type of the field is not relevant
to the error.
Updates #13779.
Change-Id: I581251145ae6336ddd181b9ddd77f657c51b5aff
Reviewed-on: https://go-review.googlesource.com/21463
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Identify this assignment case and instead of the more general error
prog.go:6: cannot assign to students["sally"].age
produce
prog.go:6: cannot directly assign to struct field students["sally"].age in map
that explains why the assignment is not possible.
Fixes#13779.
Change-Id: I90c10b445f907834fc1735aa66e44a0f447aa74f
Reviewed-on: https://go-review.googlesource.com/21462
Reviewed-by: David Chase <drchase@google.com>
It appears that windows osyield is just 15ms sleep on my computer
(see benchmarks below). Replace NtWaitForSingleObject in osyield
with SwitchToThread (as suggested by Dmitry).
Also add issue #14790 related benchmarks, so we can track perfomance
changes in CL 20834 and CL 20835 and beyond.
Update #14790
benchmark old ns/op new ns/op delta
BenchmarkChanToSyscallPing1ms 1953200 1953000 -0.01%
BenchmarkChanToSyscallPing15ms 31562904 31248400 -1.00%
BenchmarkSyscallToSyscallPing1ms 5247 4202 -19.92%
BenchmarkSyscallToSyscallPing15ms 5260 4374 -16.84%
BenchmarkChanToChanPing1ms 474 494 +4.22%
BenchmarkChanToChanPing15ms 468 489 +4.49%
BenchmarkOsYield1ms 980018 75.5 -99.99%
BenchmarkOsYield15ms 15625200 75.8 -100.00%
Change-Id: I1b4cc7caca784e2548ee3c846ca07ef152ebedce
Reviewed-on: https://go-review.googlesource.com/21294
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Run-TryBot: Dmitry Vyukov <dvyukov@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This makes these names even less likely to collide with a real user-defined function.
Fixes#13852.
Change-Id: If5a8562c6797ced19c355c7ab2c86fc4401a8674
Reviewed-on: https://go-review.googlesource.com/21490
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>
Add supporting code for runtime initialization, including both
32- and 64-bit x86 architectures.
Add .ctors section on Windows to PE .o files, and INITENTRY to .ctors
section to plug in to the GCC C/C++ startup initialization mechanism.
This allows the Go runtime to initialize itself. Add .text section
symbol for .ctor relocations. Note: This is unlikely to be useful for
MSVC-based toolchains.
Fixes#13494
Change-Id: I4286a96f70e5f5228acae88eef46e2bed95813f3
Reviewed-on: https://go-review.googlesource.com/18057
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Rather than having half a dozen switch statements. Also remove some c2go dregs.
Change-Id: I19af5b64f73369126020e15421c34cad5bbcfbf8
Reviewed-on: https://go-review.googlesource.com/21442
Reviewed-by: Ian Lance Taylor <iant@golang.org>
On s390x char is unsigned. We cannot force it to be signed using
-fsigned-char (see arm64) because the s390x gccgo API is already
public and we need to stick as closely as possible to it to avoid
breaking existing projects. In order to match the gccgo API we
also force the RawSockaddr.Data and RawSockaddrUnix.Path fields
to be signed.
This CL adds a post-processing pass (mkpost.go) to mkall.sh in
order to export the types of fields in PtraceRegs on s390x
without affecting the API on other platforms. The types of these
fields match their counterparts in gccgo. mkpost.go also cleans
up the Pad_cgo* fields and X_* fields (these fields are not
exported by gccgo currently). It could be extended to add build
tags on platforms that need them.
Change-Id: I66bdf5b86ec98af70baf666989027bb354df9e3e
Reviewed-on: https://go-review.googlesource.com/20961
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Signed-off-by: Eric Engestrom <eric@engestrom.ch>
Change-Id: I91873aaebf79bdf1c00d38aacc1a1fb8d79656a7
Reviewed-on: https://go-review.googlesource.com/21433
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This makes clear that Go's path.Join and filepath.Join are different
from the Python os.path.join (and perhaps others).
Requested in private mail.
Change-Id: Ie5dfad8a57f9baa5cca31246af1fd4dd5b1a64ee
Reviewed-on: https://go-review.googlesource.com/20711
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
