On advice of the department of garbage collection, forcing a garbage
collection generally does not improve performance. However,
this-data-is-now-unreachable is a good property to be able to test,
and that requires finalizers and a forced GC. So, to save build time,
this test was removed from the compiler itself, but to verify the
property, it was added to the fma_test (and the end-to-end dependence
on the flag was tested with an inserted failure in testing the
test).
TODO: also turn on the new -d=gccheck=1 debug flag on the ssacheck
builder.
Benchmarking reveals that it is profitable to avoid this GC,
with about 1.5% reduction in both user and wall time.
(48 p) https://perf.golang.org/search?q=upload:20221103.3
(12 p) https://perf.golang.org/search?q=upload:20221103.5
Change-Id: I4c4816d619735838a32388acf0cc5eb1cd5f0db5
Reviewed-on: https://go-review.googlesource.com/c/go/+/447359
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
For #56603, CL 448275 added a _ [0]T field to atomic.Pointer,
so that different kinds of atomic.Pointer are not convertible.
Unfortunately, that breaks code like:
type List struct {
Next atomic.Pointer[List]
}
which should be valid, just as using Next *List is valid.
Instead, we get:
./atomic_test.go:2533:6: invalid recursive type List
./atomic_test.go:2533:6: List refers to
./atomic_test.go:2534:13: "sync/atomic".Pointer refers to
./atomic_test.go:2533:6: List
Fix by using _[0]*T instead.
Change-Id: Icc4c83c691d35961d20cb14b824223d6c779ac5e
Reviewed-on: https://go-review.googlesource.com/c/go/+/450655
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
CL 440455 fixed missing walk pass for static initialization slice.
However, slicelit may produce un-typechecked node, thus we need to do
typecheck for sinit before calling walkStmtList.
Fixes#56727
Change-Id: I40730cebcd09f2be4389d71c5a90eb9a060e4ab7
Reviewed-on: https://go-review.googlesource.com/c/go/+/450215
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
This change clarifies that a finalizer is not guaranteed to run,
not only for zero bytes objects but also tiny objects (< 16bytes).
Fixes#46827
Change-Id: I193e77f6f024c79110604f86bcb1a28b16cf98ec
Reviewed-on: https://go-review.googlesource.com/c/go/+/337391
Run-TryBot: Changkun Ou <mail@changkun.de>
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Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Joedian Reid <joedian@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
We already had some tests for special cases such as PSS with 513 bit
keys. The upcoming backend rewrite also happened to crash at 63 and 504
bits for different reasons. Might as well be systematic about it.
Also, make sure SignPSS returns ErrMessageTooLong like SignPKCS1v15 when
the key is too small, instead of panicking or returning an unnamed error.
-all takes a couple minutes on my M1.
Change-Id: I656239a00d0831fa7d187a6d3bb30341d41602f7
Reviewed-on: https://go-review.googlesource.com/c/go/+/443195
Reviewed-by: Roland Shoemaker <roland@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Joedian Reid <joedian@golang.org>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
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Samples in the mutex profile have their count and duration scaled
according to the probability they were sampled. This is done when the
profile is actually requested. The adjustment is done using to the
current configured sampling rate. However, if the sample rate is changed
after a specific sample is recorded, then the sample will be scaled
incorrectly. In particular, if the sampling rate is changed to 0, all of
the samples in the encoded profile will have 0 count and duration. This
means the profile will be "empty", even if it should have had samples.
This CL scales the samples in the profile when they are recorded, rather
than when the profile is requested. This matches what is currently done
for the block profile.
With this change, neither the block profile nor mutex profile are scaled
when they are encoded, so the logic for scaling the samples can be
removed.
Change-Id: If228cf39284385aa8fb9a2d62492d839e02f027f
Reviewed-on: https://go-review.googlesource.com/c/go/+/443056
Auto-Submit: Michael Knyszek <mknyszek@google.com>
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Reviewed-by: Michael Knyszek <mknyszek@google.com>
For #48866
For #54139
For #54801
Change-Id: Iafe72ccc7e756ec1edb5bb7e8e90d385458cff29
Reviewed-on: https://go-review.googlesource.com/c/go/+/450280
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For #53435.
Change-Id: I894bd645b0b61d7dd5f3aae7d1ea7b8a12f31dd8
Reviewed-on: https://go-review.googlesource.com/c/go/+/450376
Run-TryBot: Damien Neil <dneil@google.com>
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If pprof -disasm fails, print the profile content for debugging.
For #56574.
Change-Id: I5d9377b7fb80f6b85317bc53f3ebb18f70c2f06d
Reviewed-on: https://go-review.googlesource.com/c/go/+/450281
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Cherry Mui <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
When the GC is scanning some memory (possibly conservatively),
finding a pointer, while concurrently another goroutine is
allocating an object at the same address as the found pointer, the
GC may see the pointer before the object and/or the heap bits are
initialized. This may cause the GC to see bad pointers and
possibly crash.
To prevent this, we make it that the scanner can only see the
object as allocated after the object and the heap bits are
initialized. Currently the allocator uses freeindex to find the
next available slot, and that code is coupled with updating the
free index to a new slot past it. The scanner also uses the
freeindex to determine if an object is allocated. This is somewhat
racy. This CL makes the scanner use a different field, which is
only updated after the object initialization (and a memory
barrier).
Fixes#54596.
Change-Id: I2a57a226369926e7192c253dd0d21d3faf22297c
Reviewed-on: https://go-review.googlesource.com/c/go/+/449017
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Use the same dnsConfig throughout a DNS lookup operation.
Before this CL it was possible to decide to re-read a
modified resolv.conf file during the DNS lookup,
which could lead to inconsistencies between the lookup order
and the name server list.
Change-Id: I0689749272b8263268d00b9a9cb4458cd68b23eb
GitHub-Last-Rev: 64810a22bc
GitHub-Pull-Request: golang/go#56690
Reviewed-on: https://go-review.googlesource.com/c/go/+/449337
Reviewed-by: Damien Neil <dneil@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Fixes#48801
Change-Id: I6230b62f77252a9a694b79caacb38ef15af36e39
Reviewed-on: https://go-review.googlesource.com/c/go/+/450495
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Reviewed-by: Robert Findley <rfindley@google.com>
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Run-TryBot: Tim King <taking@google.com>
Updates vet to report errors where a loop variable escapes the current
loop iteration by a call to testing.T.Run where the subtest body invokes
t.Parallel().
Change-Id: I727f01d0cdd479ff1b5b1e4f1872c530bfefb263
Reviewed-on: https://go-review.googlesource.com/c/go/+/450435
Run-TryBot: Tim King <taking@google.com>
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Reviewed-by: Robert Findley <rfindley@google.com>
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Per https://url.spec.whatwg.org/#percent-encoded-bytes an invalid
percent encoding should be handled as ordinary text.
Fixes#56732
Change-Id: Ib0259dfd704922905289eebaacbf722e28f6d636
Reviewed-on: https://go-review.googlesource.com/c/go/+/450375
Run-TryBot: Ian Lance Taylor <iant@google.com>
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Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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This reverts commit bed2b7cf41.
Reason for revert: I clicked submit by accident on the wrong CL.
Change-Id: Iddf128cb62f289d472510eb30466e515068271b2
Reviewed-on: https://go-review.googlesource.com/c/go/+/449501
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As noticed in the review of the CRL RawIssuer updates (https://go-review.googlesource.com/c/go/+/418834), the Raw field on the internal type certificate of crypto/x509 is unused and could be removed.
From looking at encoding/asn1's implementation, it appears this field would be set on unmarshal but not during marshaling. However, we unmarshal into the x509.Certificate class directly, avoiding this internal class entirely.
Change-Id: I1ab592eb939b6fe701206ba77b6727763deaeaf0
GitHub-Last-Rev: 5272e0d369
GitHub-Pull-Request: golang/go#56524
Reviewed-on: https://go-review.googlesource.com/c/go/+/447215
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Joedian Reid <joedian@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
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Auto-Submit: Roland Shoemaker <roland@golang.org>
This CL redesign how we get the TLS pointer on windows/amd64.
We were previously reading it from the [TEB] arbitrary data slot,
located at 0x28(GS), which can only hold 1 TLS pointer.
With this CL, we will read the TLS pointer from the TEB TLS slot array,
located at 0x1480(GS). The TLS slot array can hold multiple
TLS pointers, up to 64, so multiple Go runtimes running on the
same thread can coexists with different TLS.
Each new TLS slot has to be allocated via [TlsAlloc],
which returns the slot index. This index can then be used to get the
slot offset from GS with the following formula: 0x1480 + index*8
The slot index is fixed per Go runtime, so we can store it
in runtime.tls_g and use it latter on to read/update the TLS pointer.
Loading the TLS pointer requires the following asm instructions:
MOVQ runtime.tls_g, AX
MOVQ AX(GS), AX
Notice that this approach is also implemented on windows/arm64.
[TEB]: https://en.wikipedia.org/wiki/Win32_Thread_Information_Block
[TlsAlloc]: https://learn.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-tlsalloc
Updates #22192
Change-Id: Idea7119fd76a3cd083979a4d57ed64b552fa101b
Reviewed-on: https://go-review.googlesource.com/c/go/+/431775
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Updates syscall.Open to support opening directories via CreateFileW.
CreateFileW handles are more versatile than FindFirstFile handles.
They can be used in Win32 APIs like GetFileInformationByHandle and
SetFilePointerEx, which are needed by some Go APIs.
Fixes#52747Fixes#36019
Change-Id: I26a00cef9844fb4abeeb18d2f9d854162a146651
Reviewed-on: https://go-review.googlesource.com/c/go/+/405275
Reviewed-by: Roland Shoemaker <roland@golang.org>
Reviewed-by: Patrik Nyblom <pnyb@google.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Quim Muntal <quimmuntal@gmail.com>
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Add a new SSA opcode ISELZ, similar to ISELB to represent a select
of value or 0. Then, merge candidate ISEL opcodes inside the late
lower pass.
This avoids complicating rules within the the lower pass.
Change-Id: I3b14c94b763863aadc834b0e910a85870c131313
Reviewed-on: https://go-review.googlesource.com/c/go/+/442596
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Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Paul Murphy <murp@ibm.com>
Reviewed-by: Joedian Reid <joedian@golang.org>
CL 448897 changed os.Stat to request GENERIC_READ access when using
CreateFile to examine a file. This is unnecessary; access flags of 0
will permit examining file metadata even if the file isn't readable.
Revert to the old behavior here.
For #56217
Change-Id: I09220b3bbee304bd89f4a94ec9b0af42042b7773
Reviewed-on: https://go-review.googlesource.com/c/go/+/450296
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This loads the keys once per call, not once per block. This
has the effect of unrolling the inner loop too. This allows
decryption to scale better with available hardware.
Noteably, encryption serializes crypto ops, thus no
performance improvement is seen, but neither is it reduced.
Care is also taken to explicitly clear keys from registers
as was done implicitly in the prior version.
Also, fix a couple of typos from copying the asm used to
load ESPERM.
Performance delta on POWER9:
name old time/op new time/op delta
AESCBCEncrypt1K 1.10µs ± 0% 1.10µs ± 0% +0.55%
AESCBCDecrypt1K 793ns ± 0% 415ns ± 0% -47.70%
Change-Id: I52ca939fefa1d776a390a0869e7f4564058942b3
Reviewed-on: https://go-review.googlesource.com/c/go/+/441816
Run-TryBot: Paul Murphy <murp@ibm.com>
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Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
We have been expanding our use of GODEBUG for compatibility,
and the current implementation forces a tradeoff between
freshness and efficiency. It parses the environment variable
in full each time it is called, which is expensive. But if clients
cache the result, they won't respond to run-time GODEBUG
changes, as happened with x509sha1 (#56436).
This CL changes the GODEBUG API to provide efficient,
up-to-date results. Instead of a single Get function,
New returns a *godebug.Setting that itself has a Get method.
Clients can save the result of New, which is no more expensive
than errors.New, in a global variable, and then call that
variable's Get method to get the value. Get costs only two
atomic loads in the case where the variable hasn't changed
since the last call.
Unfortunately, these changes do require importing sync
from godebug, which will mean that sync itself will never
be able to use a GODEBUG setting. That doesn't seem like
such a hardship. If it was really necessary, the runtime could
pass a setting to package sync itself at startup, with the
caveat that that setting, like the ones used by runtime itself,
would not respond to run-time GODEBUG changes.
Change-Id: I99a3acfa24fb2a692610af26a5d14bbc62c966ac
Reviewed-on: https://go-review.googlesource.com/c/go/+/449504
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Fixes#54801
Change-Id: I3d03516792975ddb09835b2621c57e12e7cbad35
GitHub-Last-Rev: 4faa7e14dc
GitHub-Pull-Request: golang/go#56714
Reviewed-on: https://go-review.googlesource.com/c/go/+/449955
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For #53003.
Change-Id: If5d76c7b8dfcbcab919cad9c333c0225fc155859
Reviewed-on: https://go-review.googlesource.com/c/go/+/449537
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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Fixes#8606.
Change-Id: I64b13b2ed61ecae4641264deb47c9f7653a80356
Reviewed-on: https://go-review.googlesource.com/c/go/+/449536
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Robert Griesemer <gri@google.com>
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Under the race detector, checkptr flags uses of unsafe.Slice that
result in slices that straddle multiple Go allocations.
Avoid that scenario by calling existing runtime code.
This fixes a failure on the darwin-.*-race builders introduced in
CL 446178.
Change-Id: I6e0fdb37e3c3f38d97939a8799bb4d10f519c5b9
Reviewed-on: https://go-review.googlesource.com/c/go/+/449936
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Auto-Submit: Ian Lance Taylor <iant@golang.org>
As the comments say. Here we expect err to be nil instead of ctx.Err()
Change-Id: I4cd02d62ac0a13c9577a567de36742f13d140d36
GitHub-Last-Rev: 6bedfbc9d2
GitHub-Pull-Request: golang/go#56698
Reviewed-on: https://go-review.googlesource.com/c/go/+/449737
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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Change-Id: Ib6ea1bd04d9b06542ed2b0f453c718115417c62c
Reviewed-on: https://go-review.googlesource.com/c/go/+/449755
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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Reviewed-by: Keith Randall <khr@google.com>
These tests fail consistently due to a DNS change causing widespread
trybot outages.
Fixes#56707.
Change-Id: Iebdf91254a922a48880021198f0f12f6bc16b6e7
Reviewed-on: https://go-review.googlesource.com/c/go/+/449640
Reviewed-by: Carlos Amedee <carlos@golang.org>
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When the GC is scanning some memory (possibly conservatively),
finding a pointer, while concurrently another goroutine is
allocating an object at the same address as the found pointer, the
GC may see the pointer before the object and/or the heap bits are
initialized. This may cause the GC to see bad pointers and
possibly crash.
To prevent this, we make it that the scanner can only see the
object as allocated after the object and the heap bits are
initialized. As the scanner uses the freeindex to determine if an
object is allocated, we delay the increment of freeindex after the
initialization.
As currently in some code path finding the next free index and
updating the free index to a new slot past it is coupled, this
needs a small refactoring. In the new code mspan.nextFreeIndex
return the next free index but not update it (although allocCache
is updated). mallocgc will update it at a later time.
Fixes#54596.
Change-Id: I6dd5ccf743f2d2c46a1ed67c6a8237fe09a71260
Reviewed-on: https://go-review.googlesource.com/c/go/+/427619
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I forgot to lock the scriptResult in the overview handler, and
apparently a cmd/go test is incidentally fetching the overview page at
some point during test execution, triggering the race.
This race was caught almost immediately by the new
linux-amd64-longtest-race builder (see
https://build.golang.org/log/85ab78169a6382a73b1a26c89e64138b387da217).
Updates #27494.
Change-Id: I06ee8d54dba400800284401428ba4a59809983b2
Reviewed-on: https://go-review.googlesource.com/c/go/+/449517
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Reviewed-by: Michael Matloob <matloob@golang.org>
Many stages in the linker assume some runtime symbols exist.
Error out if the runtime package cannot be found.
Fixes#56685.
Change-Id: I39b2663f6d7419688e30e6d8650e5eb8fc43a2b1
Reviewed-on: https://go-review.googlesource.com/c/go/+/449638
Reviewed-by: Than McIntosh <thanm@google.com>
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With net converted to libc, os/user is the last remaining
cgo code in the standard libary on macOS.
Convert it to libc too.
Now only plugin remains as a cgo-using package on macOS.
Change-Id: Ibb518b5c62ef9ec1e6ab6191f4b576f7c5a4501c
Reviewed-on: https://go-review.googlesource.com/c/go/+/449316
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
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