It's never set anywhere, and even if it was, it would just Fatalf.
Change-Id: I84ade6d2068c623a8c85f84d8cdce38984996ddd
Reviewed-on: https://go-review.googlesource.com/32489
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Before aliases, and because we chose a simple export format for them,
a package may now export the same object more than once if there are
multiple exported aliases referring to that object. The go/importer
made the assumption this couldn't happen. Adjust it.
Fixes#17726.
Change-Id: Ibb9fc669a8748200b45ad78934d7453e5a5aad82
Reviewed-on: https://go-review.googlesource.com/32538
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Robert Griesemer <gri@golang.org>
Since SWIG uses cgo, when using SWIG with gccgo, the go tool will add a
_cgo_flags file to the package archive, just as it does with cgo. We
need to remove that file from the archive passed to the linker, just as
we do with cgo.
Change-Id: I5ef4fea92eec419f870fbf6f678691d15901ee6c
Reviewed-on: https://go-review.googlesource.com/32535
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>
This feels a bit like a layering violation, but as the bug report shows
it is sometimes necessary.
Fixes#17642
Change-Id: I4ba060bb1ce73a527ce276e5a769c44692b50016
Reviewed-on: https://go-review.googlesource.com/32236
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
A plugin with no exported symbols is still potentially very useful.
Its init functions are called on load, and it so it can have visible
side effects.
Fixes#17681
Change-Id: Icdca31f48e5ab13c99020a2ef724f3de47dcd74b
Reviewed-on: https://go-review.googlesource.com/32437
Run-TryBot: David Crawshaw <crawshaw@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
When we lookup a qualified identifier, we need to unpack
an alias. Do this in all places, not just one. Duh!
Fixes#17716.
For #17592.
Change-Id: I58d57b17cc635d0408b370f109c719c16757fd8e
Reviewed-on: https://go-review.googlesource.com/32534
Reviewed-by: Alan Donovan <adonovan@google.com>
The runtime.typeEquals function is used during typelinksinit to
determine the canonical set of *_type values to use throughout the
runtime. As such, it is run against non-canonical *_type values, that
is, types from modules that are duplicates of a type from another
module that was loaded earlier in the program life.
These non-canonical *_type values sometimes contain pointers. These
pointers are pointing to position-independent data, and so they are set
by ld.so using dynamic relocations when the module is loaded. As such,
the pointer can point to the equivalent memory from a previous module.
This means if typesEqual follows a pointer inside a *_type, it can end
up at a piece of memory from another module. If it reads a typeOff or
nameOff from that memory and attempts to resolve it against the
non-canonical *_type from the later module, it will end up with a
reference to junk memory.
Instead, resolve against the pointer the offset was read from, so the
data is valid.
Fixes#17709.
Should no longer matter after #17724 is resolved in a later Go.
Change-Id: Ie88b151a3407d82ac030a97b5b6a19fc781901cb
Reviewed-on: https://go-review.googlesource.com/32513
Run-TryBot: David Crawshaw <crawshaw@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
When the err from ReadFile is non-nil, we call t.Fatal(err).
Switch t.Fatal to t.Error + return.
ensure that close(results) happens on that code path as well.
Updates #17697.
Change-Id: Ifaacf27a76c175446d642086ff32f4386428080d
Reviewed-on: https://go-review.googlesource.com/32486
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This makes no practical difference, as SIGSTOP can not be caught, but
may as well be consistent.
Change-Id: I3efbbf092388bb3f6dccc94cf703c5d94d35f6a1
Reviewed-on: https://go-review.googlesource.com/32533
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This makes it possible to avoid tests where coverage affects the test
results by skipping them (or otherwise adjusting them) when coverage
is enabled.
Update #17699
Change-Id: Ifcc36cfcd88ebd677890e82ba80ee3d696ed3d7c
Reviewed-on: https://go-review.googlesource.com/32483
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Fixes#13290
Change-Id: I0f7e7683d86db501cbedb6a0b7349ceb0769701c
Reviewed-on: https://go-review.googlesource.com/32481
Reviewed-by: Martin Möhrmann <martisch@uos.de>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
sigfwd calls an arbitrary C signal handler function. The System V ABI
for x86_64 (and the most recent revision of the ABI for i386) requires
the stack to be 16-byte aligned.
Fixes: #17641
Change-Id: I77f53d4a8c29c1b0fe8cfbcc8d5381c4e6f75a6b
Reviewed-on: https://go-review.googlesource.com/32107
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Go's http1 implementation originally had a mechanism to send HTTP
trailers based on pre-declaring the trailer keys whose values you'd
later let after the header was written.
http2 copied the same mechanism, but it was found to be unsufficient
for gRPC's wire protocol. A second trailer mechanism was added later
(but only to http2) for handlers that want to send a trailer without
knowing in advance they'd need to.
Copy the same mechanism back to http1 and document it.
Fixes#15754
Change-Id: I8c40d55e28b0e5b7087d3d1a904a392c56ee1f9b
Reviewed-on: https://go-review.googlesource.com/32479
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Skip TestObjdumpPowerManual if the host system is not ppc64 or ppc64le.
This test depends on using the host objdump and comparing output, which
does not work as expected if the test is run on another host.
Orignates from golang.org/x/arch/ppc64/ppc64asm commit 8e2d4898.
Fixes#17698
Change-Id: I956b0fb78c5ec33641db752d46a755008403d269
Reviewed-on: https://go-review.googlesource.com/32531
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This should never be called but should help identify causes of
unexpected panics such as in issue #17716.
Change-Id: Id6ad0cef1088a41bfcc69110a93484a7e39c4128
Reviewed-on: https://go-review.googlesource.com/32480
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>
Fixes#17683
Change-Id: I46f45c63796b58e8a8f14e37592231cbe7cd6934
Reviewed-on: https://go-review.googlesource.com/32438
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The introduction of -buildmode=plugin means modules can be added to a
Go program while it is running. This means there exists some time
while the program is running with the module is on the moduledata
linked list, but it has not been initialized to the satisfaction of
other parts of the runtime. Notably, the GC.
This CL adds a new way of access modules, an activeModules function.
It returns a slice of modules that is built in the background and
atomically swapped in. The parts of the runtime that need to wait on
module initialization can use this slice instead of the linked list.
Fixes#17455
Change-Id: I04790fd07e40c7295beb47cea202eb439206d33d
Reviewed-on: https://go-review.googlesource.com/32357
Reviewed-by: Ian Lance Taylor <iant@golang.org>
There is no benefit to folding ADDconsts unless the resultant immediate
will fit into a 20-bit signed integer, so limit these rules accordingly.
Also the signed load operations were missing, so I've added them, and
I've also removed some MOVDaddr rules that were dead code (MOVDaddrs
are rematerializable on s390x which means they can't take inputs other
than SP or SB).
Change-Id: Iebeba78da37d3d71d32d4b7f49fe4ea9095d40ec
Reviewed-on: https://go-review.googlesource.com/30616
Run-TryBot: Michael Munday <munday@ca.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: David Chase <drchase@google.com>
- Adds overflow checks
- Adds parsing of negative integers
- Adds boolean return value to signal parsing errors
- Adds atoi32 for parsing of integers that fit in an int32
- Adds tests
Handling of errors to provide error messages
at the call sites is left to future CLs.
Updates #17718
Change-Id: I3cacd0ab1230b9efc5404c68edae7304d39bcbc0
Reviewed-on: https://go-review.googlesource.com/32390
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This implements a check that can be done at runtime for the ISA level and
hardware capability. It follows the same implementation as in s390x.
These checks will be important as we enable new instructions and write go
asm implementations using those.
Updates #15403Fixes#16643
Change-Id: Idfee374a3ffd7cf13a7d8cf0a6c83d247d3bee16
Reviewed-on: https://go-review.googlesource.com/32330
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
In a previous change, cmd/go was taught to show a "no tests ran" warning
if test did nothing. But it missed a case - if no tests nor examples ran
but any benchmarks were meant to be run, it would still produce the
warning. This meant that running only benchmarks, which is common, would
be confusing:
$ go test -run='^$' -bench=.
testing: warning: no tests to run
BenchmarkFoo-4 300000 5056 ns/op
[...]
I believe this was because of a copy-paste error in the tests. This was
being tested, but on the wrong file which does contain a test that was
being run. Fix the path and fix the now failing test by never showing
the warning if -bench was given a non-empty string.
The rationale is that if -bench was given but there was no output, it's
obvious that nothing happened as benchmarks always produce output even
without -v. So showing a warning in those cases is redundant.
To make future typos less likely, make sure that no tests are being run
in the cases where we only want to run benchmarks.
Fixes#17603.
Change-Id: I4c626caf39f72260c6a9761c06446663f465f947
Reviewed-on: https://go-review.googlesource.com/32157
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Adds ModifyResponse, an optional func to ReverseProxy
that modifies a response in the backend, right before
the headers of the response are written to the internal
response writer.
If ModifyResponse returns an error, the proxy returns
a StatusBadGateway error.
Fixes#14237.
Change-Id: I8e03139e34dea0084512ccbd8cc49e941bf9fb5d
Reviewed-on: https://go-review.googlesource.com/32356
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This CL expands upon a change made in (http://golang.org/cl/21811)
to ensure that a nil RawMessage gets serialized as "null" instead of
being a nil slice.
The added check only triggers when the RawMessage is nil. We do not
handle the case when the RawMessage is non-nil, but empty.
Fixes#17704
Updates #14493
Change-Id: I0fbebcdd81f7466c5b78c94953afc897f162ceb4
Reviewed-on: https://go-review.googlesource.com/32472
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
If no error handler is provided, terminate parsing with first error
and report that error.
Fixes#17697.
Change-Id: I9070faf7239bd53725de141507912b92ded3474b
Reviewed-on: https://go-review.googlesource.com/32456
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Also updates x/net/http2 to git rev 541150 for:
http2: add support for graceful shutdown of Server
https://golang.org/cl/32412
http2: make http2.Server access http1's Server via an interface check
https://golang.org/cl/32417Fixes#4674Fixes#9478
Change-Id: I8021a18dee0ef2fe3946ac1776d2b10d3d429052
Reviewed-on: https://go-review.googlesource.com/32329
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Currently we have write barriers for direct channel sends, where the
receiver is blocked and the sender is writing directly to the
receiver's stack; but not for direct channel receives, where the
sender is blocked and the receiver is reading directly from the
sender's stack.
This was okay with the old write barrier because either 1) the
receiver would write the received pointer into the heap (causing it to
be shaded), 2) the pointer would still be on the receiver's stack at
mark termination and we would rescan it, or 3) the receiver dropped
the pointer so it wasn't necessarily reachable anyway.
This is not okay with the write barrier because it lets a grey stack
send a white pointer to a black stack and then remove it from its own
stack. If the grey stack was the sole grey-protector of this pointer,
this hides the object from the garbage collector.
Fix this by making direct receives perform a stack-to-stack write
barrier just like direct sends do.
Fixes#17694.
Change-Id: I1a4cb904e4138d2ac22f96a3e986635534a5ae41
Reviewed-on: https://go-review.googlesource.com/32450
Reviewed-by: Rick Hudson <rlh@golang.org>
typecheckcomplit nils out node's type, upon finding new errors.
This hides new errors in children's node as well as the type info
of current node. This change fixes that.
Fixes#17645.
Change-Id: Ib473291f31c7e8fa0307cb1d494e0c112ddd3583
Reviewed-on: https://go-review.googlesource.com/32324
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Currently, assists can only perform heap marking jobs. However, at the
beginning of GC, there are only root jobs and no heap marking jobs. As
a result, there's often a period at the beginning of a GC cycle where
no goroutine has accumulated assist credit, but at the same time it
can't get any credit because there are no heap marking jobs for it to
do yet. As a result, many goroutines often block on the assist queue
at the very beginning of the GC cycle.
This commit fixes this by allowing assists to perform root marking
jobs. The tricky part of this (and the reason we haven't done this
before) is that stack scanning jobs can lead to deadlocks if the
goroutines performing the stack scanning are themselves
non-preemptible, since two non-preemptible goroutines may try to scan
each other. To address this, we use the same insight d6625ca used to
simplify the mark worker stack scanning: as long as we're careful with
the stacks and only drain jobs while on the system stack, we can put
the goroutine into a preemptible state while we drain jobs. This means
an assist's user stack can be scanned while it continues to do work.
This reduces the rate of assist blocking in the x/benchmarks HTTP
benchmark by a factor of 3 and all remaining blocking happens towards
the *end* of the GC cycle, when there may genuinely not be enough work
to go around.
Ideally, assists would get credit for working on root jobs. Currently
they do not; however, this change prioritizes heap work over root jobs
in assists, so they're likely to mostly perform heap work. In contrast
with mark workers, for assists, the root jobs act only as a backstop
to create heap work when there isn't enough heap work.
Fixes#15361.
Change-Id: If6e169863e4ad75710b0c8dc00f6125b41e9a595
Reviewed-on: https://go-review.googlesource.com/32432
Reviewed-by: Rick Hudson <rlh@golang.org>
This lifts the part of gcAssistAlloc that runs on the system stack to
its own function in preparation for letting assists perform root jobs
(notably stack scanning). This makes it easy to see that there are no
references to the user stack once we've entered gcAssistAlloc1, which
means it's safe to shrink the stack while in gcAssistAlloc1.
This does not yet make assists perform root jobs, so it's not actually
possible for the stack to shrink yet. That will happen in the next
commit.
The code in gcAssistAlloc1 is identical to the code that's currently
passed in a closure to systemstack with one exception. Currently, we
set the "completed" variable in the enclosing scope to indicate that
the assist completed the mark phase. This is exactly the sort of
cross-stack reference lifting this function is meant to prevent. We
replace this variable with setting gp.param to nil or non-nil to
indicate the completion status.
Updates #15361.
Change-Id: Iba7cfb758c781070a441aea86c0117b399a24dbd
Reviewed-on: https://go-review.googlesource.com/32431
TryBot-Result: Gobot Gobot <gobot@golang.org>
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Rick Hudson <rlh@golang.org>
Previously, on encountering Func.Nname.Type == nil, typecheckfunc()
returned without initializing Decldepth for that func. This causes
typecheckclosure() to fatal. This change ensures that we initialize
Decldepth in all cases.
Fixes#17588.
Change-Id: I2e3c81ad52e8383395025388989e8dbf03438b68
Reviewed-on: https://go-review.googlesource.com/32415
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
We used to have to keep on-stack copies of these types.
Now they can be registerized.
[0]T is kind of trivial but might as well handle it.
This change enables another change I'm working on to improve how x.(T)
expressions are handled (#17405). This CL helps because now all
types that are direct interface types are registerizeable (e.g. [1]*byte).
No higher-degree arrays for now because non-constant indexes are hard.
Update #17405
Change-Id: I2399940965d17b3969ae66f6fe447a8cefdd6edd
Reviewed-on: https://go-review.googlesource.com/32416
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This is an extension of
https://go-review.googlesource.com/c/31662/
to mark all the temporaries, not just the ssa-generated ones.
Before-and-after ls -l `go tool -n compile` shows a 3%
reduction in size (or rather, a prior 3% inflation for
failing to filter temps out properly.)
Replaced name-dependent "is it a temp?" tests with calls to
*Node.IsAutoTmp(), which depends on AutoTemp. Also replace
calls to istemp(n) with n.IsAutoTmp(), to reduce duplication
and clean up function name space. Generated temporaries
now come with a "." prefix to avoid (apparently harmless)
clashes with legal Go variable names.
Fixes#17644.
Fixes#17240.
Change-Id: If1417f29c79a7275d7303ddf859b51472890fd43
Reviewed-on: https://go-review.googlesource.com/32255
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This picks up just a trivial fix,
making vet (and thus me) happy.
Change-Id: Ib82ae44c081ff1ec5c078196a6cd5e1a3505d03b
Reviewed-on: https://go-review.googlesource.com/32427
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
-M, -P, and -R were for debugging backend passes that no longer
exists.
-g is used for debugging instructions generated with Gins, but the SSA
backend mostly generates instructions directly. The handful of
instructions still generated with Gins are pretty useless for
debugging.
-x was used to debug the old lexer, but now it only causes us to print
file names as they're parsed, and only if we manually hack the
compiler to enable tracing.
Change-Id: Ia58d4bc9c1312693466171a3fcefc1221e9a2381
Reviewed-on: https://go-review.googlesource.com/32428
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Adds an assembly implementation of sha256.block for ppc64le to improve its
performance. This implementation is largely based on the original amd64
implementation, which unrolls the 64 iterations of the inner loop.
Fixes#17652
benchmark old ns/op new ns/op delta
BenchmarkHash8Bytes 1263 767 -39.27%
BenchmarkHash1K 14048 7766 -44.72%
BenchmarkHash8K 102245 55626 -45.60%
benchmark old MB/s new MB/s speedup
BenchmarkHash8Bytes 6.33 10.43 1.65x
BenchmarkHash1K 72.89 131.85 1.81x
BenchmarkHash8K 80.12 147.27 1.84x
Change-Id: Ib4adf429423b20495580400be10bd7e171bcc70b
Reviewed-on: https://go-review.googlesource.com/32318
Reviewed-by: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Adds an assembly implementation of sha512.block for ppc64le to improve its
performance. This implementation is largely based on the original amd64
implementation, unrolling the 80 iterations of the inner loop.
Fixes#17660
benchmark old ns/op new ns/op delta
BenchmarkHash8Bytes 1715 1133 -33.94%
BenchmarkHash1K 10098 5513 -45.41%
BenchmarkHash8K 68004 35278 -48.12%
benchmark old MB/s new MB/s speedup
BenchmarkHash8Bytes 4.66 7.06 1.52x
BenchmarkHash1K 101.40 185.72 1.83x
BenchmarkHash8K 120.46 232.21 1.93x
Change-Id: Ifd55a49a24cb159b3a09a8e928c3f37727aca103
Reviewed-on: https://go-review.googlesource.com/32320
Reviewed-by: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
