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When GO386=sse2 we can assume sse2 to be present without
a runtime check. If GO386=softfloat is set we can avoid
the usage of SSE2 even if detected.
This might cause a memcpy, memclr and bytealg slowdown of Go
binaries compiled with softfloat on machines that support
SSE2. Such setups are rare and should use GO386=sse2 instead
if performance matters.
On targets that support SSE2 we avoid the runtime overhead of
dynamic cpu feature dispatch.
The removal of runtime sse2 checks also allows to simplify
internal/cpu further by removing handling of the required
feature option as a followup after this CL.
Change-Id: I90a853a8853a405cb665497c6d1a86556947ba17
Reviewed-on: https://go-review.googlesource.com/c/go/+/344350
Trust: Martin Möhrmann <martin@golang.org>
Run-TryBot: Martin Möhrmann <martin@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
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To measure all instructions having been completed before reading
the time stamp counter with RDTSC an instruction sequence that
has instruction stream serializing properties which guarantee
waiting until all previous instructions have been executed is
needed. This does not necessary mean to wait for all stores to
be globally visible.
This CL aims to remove vendor specific logic for determining the
instruction sequence with CPU feature flag checks that are
CPU vendor independent.
For intel LFENCE has the wanted properties at least
since it was introduced together with SSE2 support.
On AMD instruction stream serializing LFENCE is supported by setting
an MSR C001_1029[1]=1 on AMD family 10h/12h/14h/15h/16h/17h processors.
AMD family 0Fh/11h processors support LFENCE as serializing always.
AMD plans support for this MSR and access to this bit for all future processors.
Source: https://developer.amd.com/wp-content/resources/Managing-Speculation-on-AMD-Processors.pdf
Reading the MSR to determine LFENCE properties is not always possible
or reliable (hypervisors). The Linux kernel is relying on serializing
LFENCE on AMD CPUs since a commit in July 2019: https://lkml.org/lkml/2019/7/22/295
and the MSR C001_1029 to enable serialization has been set by default
with the Spectre v1 mitigations.
Using an MFENCE on AMD is waiting on previous instructions having been executed
but in addition also flushes store buffers.
To align the serialization properties without runtime detection
of CPU manufacturers we can use the newer RDTSCP instruction which
waits until all previous instructions have been executed.
RDTSCP is available on Intel since around 2008 and on AMD CPUs since
around 2006. Support for RDTSCP can be checked independently
of manufacturer by checking CPUID bits.
Using RDTSCP is the default in Linux to read TSC in program order
when the instruction is available.
https://github.com/torvalds/linux/blob/e22ce8eb631bdc47a4a4ea7ecf4e4ba499db4f93/arch/x86/include/asm/msr.h#L231
Change-Id: Ifa841843b9abb2816f8f0754a163ebf01385306d
Reviewed-on: https://go-review.googlesource.com/c/go/+/344429
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Martin Möhrmann <martin@golang.org>
Run-TryBot: Martin Möhrmann <martin@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
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On amd64 this reduces go binary sizes by 176 bytes due to not referencing
internal/cpu.ARM64 and internal/cpu.ARM.
Change-Id: I8e4f31e2b1939b05eec2148b44d7cff7e0aeb30e
Reviewed-on: https://go-review.googlesource.com/c/go/+/344329
Trust: Martin Möhrmann <martin@golang.org>
Run-TryBot: Martin Möhrmann <martin@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
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sigprocmask is called from sigsave, which is called from needm. As such,
sigprocmask has to be able to run with no g. For some reason we do not
currently trip this on current libc platforms, but we do hit it on
openbsd/mips64 with external linking.
Updates #36435
Change-Id: I4dfae924245c5f68cc012755d6485939014898a3
Reviewed-on: https://go-review.googlesource.com/c/go/+/334879
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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We have a constant for 179999, don't duplicate it.
Change-Id: Iefb9c4746f6dda2e08b42e3c978963198469ee8c
Reviewed-on: https://go-review.googlesource.com/c/go/+/277375
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Pratt <mpratt@google.com>
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This CL adds a new syscall.SyscallN API.
The proposal discussion also suggests the API should not only for
Windows but other platforms. However, the existing API set already
contain differences between platforms, hence the CL only implements
the Windows platform.
Moreover, although the API offers variadic parameters, the permitted
parameters remains up to a limit, which is selected as 42, and arguably
large enough.
Fixes #46552
Change-Id: I66b49988a304d9fc178c7cd5de46d0b75e167a4f
Reviewed-on: https://go-review.googlesource.com/c/go/+/336550
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Trust: Matthew Dempsky <mdempsky@google.com>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
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Use RDCYCLE instruction instead of RDTIME emulation
Change-Id: Id7b3de42a36d2d1b163c39cc79870eee7c840ad5
Reviewed-on: https://go-review.googlesource.com/c/go/+/332954
Trust: Meng Zhuo <mzh@golangcn.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Change-Id: I83180c472db8795803c1b9be3a33f35959e4dcc2
Reviewed-on: https://go-review.googlesource.com/c/go/+/336889
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
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If the pcdata value indicates a restartable sequence, it is okay
to asynchronously preempt (and resume at the restart PC). Accept
it in isAsyncSafePoint.
Fixes #47530.
Change-Id: I419225717c8eee5812f3235338262da5895aad0d
Reviewed-on: https://go-review.googlesource.com/c/go/+/340011
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
Reviewed-by: Joel Sing <joel@sing.id.au>
Reviewed-by: Austin Clements <austin@google.com>
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Detect the NetBSD version in osinit and only enable the workaround for
the kernel bug identified in #42515 for NetBSD versions older than 9.2.
For #42515
For #46495
Change-Id: I808846c7f8e47e5f7cc0a2f869246f4bd90d8e22
Reviewed-on: https://go-review.googlesource.com/c/go/+/324472
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Trust: Benny Siegert <bsiegert@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
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In asmcgocall() we need to switch to the g0 stack if we're not already on
the g0 stack or the gsignal stack. The prefered way of doing this is to
check gsignal first, then g0, since if we are going to switch to g0 we will
need g0 handy (thus avoiding a second load).
Rewrite/reorder 386 and amd64 to check gsignal first - this shaves a few
assembly instructions off and makes the order consistent with arm, arm64,
mips64 and ppc64. Add missing gsignal checks to mips, riscv64 and s390x.
Change-Id: I1b027bf393c25e0c33e1d8eb80de67e4a0a3f561
Reviewed-on: https://go-review.googlesource.com/c/go/+/335869
Trust: Joel Sing <joel@sing.id.au>
Run-TryBot: Joel Sing <joel@sing.id.au>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Do not switch to the g0 stack if we're already running on the signal
stack, otherwise all kind of fun ensues.
Updates #36435
Change-Id: I57f35d75b9ee4f92b997713b4cdd38ce881705e6
Reviewed-on: https://go-review.googlesource.com/c/go/+/334880
Trust: Joel Sing <joel@sing.id.au>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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This is required now that defs_openbsd.go has pthread related references.
Updates #36435
Change-Id: I73cdf23eef6aceea6f9b37b7702bdb3b560aa120
Reviewed-on: https://go-review.googlesource.com/c/go/+/334877
Trust: Joel Sing <joel@sing.id.au>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Follow CL 94775 and CL 93655 which removed the (commented-out) usage
of this function on other platforms.
Change-Id: I28e0569d8531d0c09f3caefa7c4eb54fb5bd8a33
Reviewed-on: https://go-review.googlesource.com/c/go/+/334429
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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In https://golang.org/cl/140930043 syscall.BeforeFork was changed to
call beforefork via onM. This was done because at the time BeforeFork
was written in C but was called from Go. While the runtime was being
converted to Go, calls to complex C functions used onM to ensure that
enough stack space was available.
In https://golang.org/cl/172260043 the syscall.BeforeFork and
beforefork functions were rewritten into Go. In this rewrite
syscall.BeforeFork continue to call beforefork via onM, although
because both functions were now in Go that was no longer necessary.
In https://golang.org/cl/174950043 onM was renamed to systemstack,
producing essentially the code we have today.
Therefore, the use of systemstack in syscall.BeforeFork (and
syscall.AfterFork) is a historical relic. Remove it.
Change-Id: Ia570f556b20e8405afa6c5e707bd6f4ad18fd7ca
Reviewed-on: https://go-review.googlesource.com/c/go/+/341335
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
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CL 294430 made packages in std and cmd modules use Go 1.17 gofmt format,
adding //go:build lines. This change applies the same formatting to some
more packages that 'go fmt' missed (e.g., syscall/js, runtime/msan), and
everything else that is easy and safe to modify in bulk.
Consider the top-level test directory, testdata, and vendor directories
out of scope, since there are many files that don't follow strict gofmt
formatting, often for intentional and legitimate reasons (testing gofmt
itself, invalid Go programs that shouldn't crash the compiler, etc.).
That makes it easy and safe to gofmt -w the .go files that are found
with gofmt -l with aforementioned directories filtered out:
$ gofmt -l . 2>/dev/null | \
grep -v '^test/' | \
grep -v '/testdata/' | \
grep -v '/vendor/' | wc -l
51
None of the 51 files are generated. After this change, the same command
prints 0.
For #41184.
Change-Id: Ia96ee2a0f998d6a167d4473bcad17ad09bc1d86e
Reviewed-on: https://go-review.googlesource.com/c/go/+/341009
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
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On Linux ARMv6 and below runtime/internal/atomic.Cas calls into a kernel
cas helper at a fixed address. If a SIGPROF arrives while executing the
kernel helper, the sigprof lostAtomic logic will miss that we are
potentially in the spinlock critical section, which could cause
a deadlock when using atomics later in sigprof.
Fixes #47505
Change-Id: If8ba0d0fc47e45d4e6c68eca98fac4c6ed4e43c1
Reviewed-on: https://go-review.googlesource.com/c/go/+/341889
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
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Conflicts:
- src/go/types/check_test.go
CL 324730 on dev.typeparams changed the directory paths in TestCheck,
TestExamples, and TestFixedbugs and renamed checkFiles to testFiles;
whereas CL 337529 on master added a new test case just above them and
that used checkFiles.
Merge List:
+ 2021-08-12 46fd547d89 internal/goversion: update Version to 1.18
+ 2021-08-12 5805efc78e doc/go1.17: remove draft notice
+ 2021-08-12 39634e7dae CONTRIBUTORS: update for the Go 1.17 release
+ 2021-08-12 095bb790e1 os/exec: re-enable LookPathTest/16
+ 2021-08-11 dea23e9ca8 src/make.*: make --no-clean flag a no-op that prints a warning
+ 2021-08-11 d4c0ed26ac doc/go1.17: linker passes -I to extld as -Wl,--dynamic-linker
+ 2021-08-10 1f9c9d8530 doc: use "high address/low address" instead of "top/bottom"
+ 2021-08-09 f1dce319ff cmd/go: with -mod=vendor, don't panic if there are duplicate requirements
+ 2021-08-09 7aeaad5c86 runtime/cgo: when using msan explicitly unpoison cgoCallers
+ 2021-08-08 507cc341ec doc: add example for conversion from slice expressions to array ptr
+ 2021-08-07 891547e2d4 doc/go1.17: fix a typo introduced in CL 335135
+ 2021-08-06 8eaf4d16bc make.bash: do not overwrite GO_LDSO if already set
+ 2021-08-06 63b968f4f8 doc/go1.17: clarify Modules changes
+ 2021-08-06 70546f6404 runtime: allow arm64 SEH to be called if illegal instruction
+ 2021-08-05 fd45e267c2 runtime: warn that KeepAlive is not an unsafe.Pointer workaround
+ 2021-08-04 6e738868a7 net/http: speed up and deflake TestCancelRequestWhenSharingConnection
+ 2021-08-02 8a7ee4c51e io/fs: don't use absolute path in DirEntry.Name doc
+ 2021-07-31 b8ca6e59ed all: gofmt
+ 2021-07-30 b7a85e0003 net/http/httputil: close incoming ReverseProxy request body
+ 2021-07-29 70fd4e47d7 runtime: avoid possible preemption when returning from Go to C
+ 2021-07-28 9eee0ed439 cmd/go: fix go.mod file name printed in error messages for replacements
+ 2021-07-28 b39e0f461c runtime: don't crash on nil pointers in checkptrAlignment
+ 2021-07-27 7cd10c1149 cmd/go: use .mod instead of .zip to determine if version has go.mod file
+ 2021-07-27 c8cf0f74e4 cmd/go: add missing flag in UsageLine
+ 2021-07-27 7ba8e796c9 testing: clarify T.Name returns a distinct name of the running test
+ 2021-07-27 33ff155970 go/types: preserve untyped constants on the RHS of a shift expression
+ 2021-07-26 840e583ff3 runtime: correct variable name in comment
+ 2021-07-26 bfbb288574 runtime: remove adjustTimers counter
+ 2021-07-26 9c81fd53b3 cmd/vet: add missing copyright header
Change-Id: Ia80604d24c6f4205265683024e3100769cf32065
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As we commit to always enabling register ABI on AMD64, remove the
fallback code.
Change-Id: I30556858ba4bac367495fa94f6a8682ecd771196
Reviewed-on: https://go-review.googlesource.com/c/go/+/341152
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Austin Clements <austin@google.com>
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In Go 1.17 we added register ABI on AMD64 on Linux/macOS/Windows
as a GOEXPERIMENT, on by default. In Go 1.18, we commit to always
enabling register ABI on AMD64.
Now "go build" for AMD64 always have goexperiment.regabi* tags
set. However, at bootstrapping cmd/dist does not set the tags
when building go_bootstrap. For this to work, unfortunately, we
need to hard-code AMD64 to use register ABI in runtime code.
Change-Id: I0b31e678e186b9cdeeb8502cd9e38ed0d7e72d4f
Reviewed-on: https://go-review.googlesource.com/c/go/+/341151
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Austin Clements <austin@google.com>
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The current document uses the "top" and "bottom" when talking
about the address within a frame, which may easily lead to
misunderstandings. This patch directly uses "high address"
and "low address" to make the expression clearer.
Change-Id: I7469330bbdc158672d7f0314fe6680ebdd9ab79a
Reviewed-on: https://go-review.googlesource.com/c/go/+/339369
Trust: fannie zhang <Fannie.Zhang@arm.com>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Simplify the implementation of interface conversions in the compiler.
Don't pass fields that aren't needed (the data word, usually) to the runtime.
For generics, we need to put a dynamic type in an interface. The new
dataWord function is exactly what we need (the type word will come
from a dictionary).
Change-Id: Iade5de5c174854b65ad248f35c7893c603f7be3d
Reviewed-on: https://go-review.googlesource.com/c/go/+/340029
Trust: Keith Randall <khr@golang.org>
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
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This avoids an incorrect msan uninitialized memory report when using
runtime.SetCgoTraceback when a signal occurs while the fifth argument
register is undefined. See the issue for more details.
Fixes #47543
Change-Id: I3d1b673e2c93471ccdae0171a99b88b5a6062840
Reviewed-on: https://go-review.googlesource.com/c/go/+/339902
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Austin Clements <austin@google.com>
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DLLs built with recent Microsoft toolchains for ARM64 test for ARMv8.1
atomics by potentially calling an illegal instruction, and then trapping
the exception to disable use of them by way of a structured exception
handler. However, vectored exception handlers are always called before
structured exception handlers. When LoadLibrary-ing DLLs that do this
probing during initialization, our lastcontinuehandler winds up being
called, and then crashing, but actually it should give execution back to
the library to handle the exception and fix up the state. So special
case this for arm64 with illegal instructions, and hope that we're not
masking other things in external DLLs that might more fatally trigger an
illegal instruction exception.
Updates #47576.
Change-Id: I341ab99cd8d513ae999b75596749d49779072022
Reviewed-on: https://go-review.googlesource.com/c/go/+/340070
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
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Even experienced users occasionally mistake that runtime.KeepAlive can
be used as a workaround for following the unsafe.Pointer safety rules,
but it cannot. Add an explicit warning to this effect to dissuade
users from trying to use it as such.
Fixes #47562.
Change-Id: I842e33a3e1c080933c6b1bd1b6318448adbf495c
Reviewed-on: https://go-review.googlesource.com/c/go/+/340269
Trust: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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CL 339396 allowed stack copying on entry to and during freedefer, but
this introduced a subtle bug: if d is heap-allocated, and d.link
points to a stack-allocated defer, stack copying during freedefer can
briefly introduce a stale pointer, which the garbage collector can
discover and panic about. This happens because d has already been
unlinked from the defer chain when freedefer is called, so stack
copying won't update stack pointers in it.
Fix this by making freedefer nosplit again and immediately clearing
d.link.
This should fix the longtest builders, which currently fail on
GOMAXPROCS=2 runtime -cpu=1,2,4 -quick in the TestDeferHeapAndStack
test.
This seems like the simplest fix, but it just deals with the subtlety
rather than eliminating it. Really, every call site of freedefer (of
which there are surprisingly many) has hidden subtlety between
unlinking the defer and calling freedefer. We could consolidate the
subtlety into each call site by requiring that they unlink the defer
and set d.link to nil before calling freedefer. freedefer could check
this condition like it checks that various other fields have already
been zeroed. A more radical option is to replace freedefer with
"popDefer", which would both pop the defer off the link and take care
of freeing it. There would still be a brief moment of subtlety, but it
would be in one place, in popDefer. Annoyingly, *almost* every call to
freedefer just pops the defer from the head of the G's list, but
there's one place when handling open-coded defers where we have to
remove a defer from the middle of the list. I'm inclined to first fix
that subtlety by only expanding open-coded defer records when they're
at the head of the defer list, and then revisit the popDefer idea.
Change-Id: I3130d2542c01a421a5d60e8c31f5379263219627
Reviewed-on: https://go-review.googlesource.com/c/go/+/339730
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Currently, freedefer manually zeros all the fields in the _defer
because simply assigning _defer{} used to cause a nosplit stack
overflow. freedefer is no longer nosplit, so go back to the simpler,
more robust code.
Change-Id: I881f557bab3b1ee7ab29b68e7fb56d0fe6d35d8d
Reviewed-on: https://go-review.googlesource.com/c/go/+/339669
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Currently, deferreturn runs deferred functions by backing up its
return PC to the deferreturn call, and then effectively tail-calling
the deferred function (via jmpdefer). The effect of this is that the
deferred function appears to be called directly from the deferee, and
when it returns, the deferee calls deferreturn again so it can run the
next deferred function if necessary.
This unusual flow control leads to a large number of special cases and
complications all over the tool chain.
This used to be necessary because deferreturn copied the deferred
function's argument frame directly into its caller's frame and then
had to invoke that call as if it had been called from its caller's
frame so it could access it arguments. But now that we've simplified
defer processing so the runtime only deals with argument-less
closures, this approach is no longer necessary.
This CL simplifies all of this by making deferreturn simply call
deferred functions in a loop.
This eliminates the need for jmpdefer, so we can delete a bunch of
per-architecture assembly code.
This eliminates several special cases on Wasm, since it couldn't
support these calling shenanigans directly and thus had to simulate
the loop a different way. Now Wasm can largely work the way the other
platforms do.
This eliminates the per-architecture Ginsnopdefer operation. On PPC64,
this was necessary to reload the TOC pointer after the tail call
(since TOC pointers in general make tail calls impossible). The tail
call is gone, and in the case where we do force a jump to the
deferreturn call when recovering from an open-coded defer, we go
through gogo (via runtime.recovery), which handles the TOC. On other
platforms, we needed a NOP so traceback didn't get confused by seeing
the return to the CALL instruction, rather than the usual return to
the instruction following the CALL instruction. Now we don't inject a
return to the CALL instruction at all, so this NOP is also
unnecessary.
The one potential effect of this is that deferreturn could now appear
in stack traces from deferred functions. However, this could already
happen from open-coded defers, so we've long since marked deferreturn
as a "wrapper" so it gets elided not only from printed stack traces,
but from runtime.Callers*.
This is a retry of CL 337652 because we had to back out its parent.
There are no changes in this version.
Change-Id: I3f54b7fec1d7ccac71cc6cf6835c6a46b7e5fb6c
Reviewed-on: https://go-review.googlesource.com/c/go/+/339397
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Prior to regabi, the compiler passed defer arguments to the runtime as
untyped values on the stack. This meant a lot of defer-related runtime
functions had to be very careful not to grow the stack or allow
preemption since the stack could not be safely scanned or moved.
However, with regabi, every defer is now simply a func() from the
runtime's perspective, which means we no longer have untyped values on
the stack when we enter defer-related runtime code.
Hence, this CL removes a lot of the now-unnecessary carefulness in the
defer implementation. Specifically, deferreturn no longer needs to be
nosplit because it doesn't copy untyped defer arguments to its
caller's frame (we also update some stale comments in deferreturn).
freedefer no longer needs to be nosplit because it's none of its
callers are deeply nosplit. And newdefer and freedefer no longer need
to switch to the systemstack on their slow paths to avoid stack
growth.
deferprocStack is the only function that still needs to be nosplit,
but that's because the compiler calls it with uninitialized live
pointer slots on the stack (maybe we should change that, but that's a
very different fix).
This is a retry of CL 337651, which was rolled back. This version
disables preemption in newdefer and freedefer while they hold the
current P.
Change-Id: Ibf469addc0b69dc3ba9a3d1a5e0c2804b7b4b244
Reviewed-on: https://go-review.googlesource.com/c/go/+/339396
Trust: Austin Clements <austin@google.com>
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Reviewed-by: Cherry Mui <cherryyz@google.com>
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Currently, most softfloat functions take uint32/64 arguments (for
bit representation of float32/64) and operate on uint32/64. But
there are exeptions where the function take float arguments and
operate on float. So they are only actually softfloat if the
helper functions themselves are translated (by the compiler's
softfloat mode). These are mostly fine (besides being a bit
convoluted). But with register ABIs this inconsistency adds
complexity to the compiler to generate such calls, because it
needs to be called with the right ABI.
Rewrite the functions to operate on uint32/64 directly, using
other helper functions. So they all take uint32/64 arguments and
return uint32/64.
Change-Id: Id9383b74bcbafee44160cc5b58ab245bffbbdfd2
Reviewed-on: https://go-review.googlesource.com/c/go/+/327273
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
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Reviewed-by: David Chase <drchase@google.com>
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Change-Id: Icfafcfb62a389d9fd2e7a4d17809486ed91f15c3
Reviewed-on: https://go-review.googlesource.com/c/go/+/338629
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
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Reviewed-by: Ian Lance Taylor <iant@golang.org>
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split-prevention from defer code"
This reverts CL 337651.
This causes `go test -count 1000 -run TestDeferHeapAndStack runtime`
to fail with a SIGSEGV freedefer
[https://build.golang.org/log/c113b366cc6d51146db02a07b4d7dd931133efd5]
and possibly sometimes a GC bad pointer panic
[https://build.golang.org/log/5b1cef7a9ad68704e9ef3ce3ad2fefca3ba86998].
Change-Id: Ie56c274b78603c81191213b302225ae19de27fb9
Reviewed-on: https://go-review.googlesource.com/c/go/+/338710
Trust: Austin Clements <austin@google.com>
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Reviewed-by: Cherry Mui <cherryyz@google.com>
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replace jmpdefer with a loop"
This reverts CL 227652.
I'm reverting CL 337651 and this builds on top of it.
Change-Id: I03ce363be44c2a3defff2e43e7b1aad83386820d
Reviewed-on: https://go-review.googlesource.com/c/go/+/338709
Trust: Austin Clements <austin@google.com>
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Currently, deferreturn runs deferred functions by backing up its
return PC to the deferreturn call, and then effectively tail-calling
the deferred function (via jmpdefer). The effect of this is that the
deferred function appears to be called directly from the deferee, and
when it returns, the deferee calls deferreturn again so it can run the
next deferred function if necessary.
This unusual flow control leads to a large number of special cases and
complications all over the tool chain.
This used to be necessary because deferreturn copied the deferred
function's argument frame directly into its caller's frame and then
had to invoke that call as if it had been called from its caller's
frame so it could access it arguments. But now that we've simplified
defer processing so the runtime only deals with argument-less
closures, this approach is no longer necessary.
This CL simplifies all of this by making deferreturn simply call
deferred functions in a loop.
This eliminates the need for jmpdefer, so we can delete a bunch of
per-architecture assembly code.
This eliminates several special cases on Wasm, since it couldn't
support these calling shenanigans directly and thus had to simulate
the loop a different way. Now Wasm can largely work the way the other
platforms do.
This eliminates the per-architecture Ginsnopdefer operation. On PPC64,
this was necessary to reload the TOC pointer after the tail call
(since TOC pointers in general make tail calls impossible). The tail
call is gone, and in the case where we do force a jump to the
deferreturn call when recovering from an open-coded defer, we go
through gogo (via runtime.recovery), which handles the TOC. On other
platforms, we needed a NOP so traceback didn't get confused by seeing
the return to the CALL instruction, rather than the usual return to
the instruction following the CALL instruction. Now we don't inject a
return to the CALL instruction at all, so this NOP is also
unnecessary.
The one potential effect of this is that deferreturn could now appear
in stack traces from deferred functions. However, this could already
happen from open-coded defers, so we've long since marked deferreturn
as a "wrapper" so it gets elided not only from printed stack traces,
but from runtime.Callers*.
Change-Id: Ie9f700cd3fb774f498c9edce363772a868407bf7
Reviewed-on: https://go-review.googlesource.com/c/go/+/337652
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Prior to regabi, the compiler passed defer arguments to the runtime as
untyped values on the stack. This meant a lot of defer-related runtime
functions had to be very careful not to grow the stack or allow
preemption since the stack could not be safely scanned or moved.
However, with regabi, every defer is now simply a func() from the
runtime's perspective, which means we no longer have untyped values on
the stack when we enter defer-related runtime code.
Hence, this CL removes a lot of the now-unnecessary carefulness in the
defer implementation. Specifically, deferreturn no longer needs to be
nosplit because it doesn't copy untyped defer arguments to its
caller's frame (we also update some stale comments in deferreturn).
freedefer no longer needs to be nosplit because it's none of its
callers are deeply nosplit. And newdefer and freedefer no longer need
to switch to the systemstack on their slow paths to avoid stack
growth.
deferprocStack is the only function that still needs to be nosplit,
but that's because the compiler calls it with uninitialized live
pointer slots on the stack (maybe we should change that, but that's a
very different fix).
Change-Id: I1156ec90bff2613fe4b48b84b375943349ce637d
Reviewed-on: https://go-review.googlesource.com/c/go/+/337651
Trust: Austin Clements <austin@google.com>
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Prior to regabi, a deferred function could have any signature, so the
runtime always manipulated them as funcvals. Now, a deferred function
is always func(). Hence, this CL makes the runtime's manipulation of
deferred functions more type-safe by using func() directly instead of
*funcval.
Change-Id: Ib55f38ed49107f74149725c65044e4690761971d
Reviewed-on: https://go-review.googlesource.com/c/go/+/337650
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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comparable type
Comparable type no longer has a special method '=='.
Change-Id: I152f324d83343a66300050479181a6607fb7ca26
Reviewed-on: https://go-review.googlesource.com/c/go/+/338409
Run-TryBot: Dan Scales <danscales@google.com>
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Reviewed-by: Keith Randall <khr@golang.org>
Trust: Dan Scales <danscales@google.com>
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When returning from Go to C, it was possible for the goroutine to be
preempted after calling unlockOSThread. This could happen when there
a context function installed by SetCgoTraceback set a non-zero context,
leading to a defer call in cgocallbackg1. The defer function wrapper,
introduced in 1.17 as part of the regabi support, was not nosplit,
and hence was a potential preemption point. If it did get preempted,
the G would move to a new M. It would then attempt to return to C
code on a different stack, typically leading to a SIGSEGV.
Fix this in a simple way by postponing the unlockOSThread until after
the other defer. Also check for the failure condition and fail early,
rather than waiting for a SIGSEGV.
Without the fix to cgocall.go, the test case fails about 50% of the
time on my laptop.
Fixes #47441
Change-Id: Ib8ca13215bd36cddc2a49e86698824a29c6a68ba
Reviewed-on: https://go-review.googlesource.com/c/go/+/338197
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Ironically, checkptrAlignment had a latent case of bad pointer
arithmetic: if ptr is nil, then `add(ptr, size-1)` might produce an
illegal pointer value.
The fix is to simply check for nil at the top of checkptrAlignment,
and short-circuit if so.
This CL also adds a more explicit bounds check in checkptrStraddles,
rather than relying on `add(ptr, size-1)` to wrap around. I don't
think this is necessary today, but it seems prudent to be careful.
Fixes #47430.
Change-Id: I5c50b2f7f41415dbebbd803e1b8e7766ca95e1fd
Reviewed-on: https://go-review.googlesource.com/c/go/+/338029
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Keith Randall <khr@golang.org>
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Currently, deferproc stores the caller SP as a uintptr in a local
variable across a call to newdefer, but newdefer could grow the stack
and invalidate this saved SP, causing deferproc to store a stale SP in
the defer record. This would lead to us later failing to match that
defer to its calling frame, and we wouldn't run the defer at the right
time (or possibly at all).
It turns out this isn't crashing horribly right now only because the
compiler happens to only materialize the result of getcallersp when
this variable is used, *after* the call to newdefer. But this is
clearly on thin ice, so this CL moves the getcallersp() to the place
where we actually need the result.
Change-Id: Iae8ab226e03e4482f16acfb965885f0bd83a13b0
Reviewed-on: https://go-review.googlesource.com/c/go/+/337649
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Change-Id: Ic35ec2ed320c3c266afbeec8bdea1dedac4725e4
Reviewed-on: https://go-review.googlesource.com/c/go/+/336892
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Austin Clements <austin@google.com>
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In CL 336432 we changed adjusttimers so that it no longer cleared
timerModifiedEarliest if there were no timersModifiedEarlier timers.
This caused some Google internal tests to time out, presumably due
to the increased contention on timersLock. We can avoid that by
simply not skipping the loop in adjusttimers, which lets us safely
clear timerModifiedEarliest. And if we don't skip the loop, then there
isn't much reason to keep the count of timerModifiedEarlier timers at all.
So remove it.
The effect will be that for programs that create some timerModifiedEarlier
timers and then remove them all, the program will do an occasional
additional loop over all the timers. And, programs that have some
timerModifiedEarlier timers will always loop over all the timers,
without the quicker exit when they have all been seen. But the loops
should not occur all that often, due to timerModifiedEarliest.
For #47329
Change-Id: I7b244c1244d97b169a3c7fbc8f8a8b115731ddee
Reviewed-on: https://go-review.googlesource.com/c/go/+/337309
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Michael Pratt <mpratt@google.com>
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into dev.typeparams
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I don't know what this test is doing, but it very frequently flakes
for me while testing mundane compiler CLs. According to the issue log,
it's been flaky for ~3 years.
Updates #37331.
Change-Id: I81c43ad646ee12d4c6561290a54e4bf637695bc6
Reviewed-on: https://go-review.googlesource.com/c/go/+/336349
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
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Merge List:
+ 2021-07-22 798ec73519 runtime: don't clear timerModifiedEarliest if adjustTimers is 0
+ 2021-07-22 fdb45acd1f runtime: move mem profile sampling into m-acquired section
+ 2021-07-21 3e48c0381f reflect: add missing copyright header
+ 2021-07-21 48c88f1b1b reflect: add Value.CanConvert
+ 2021-07-20 9e26569293 cmd/go: don't add C compiler ID to hash for standard library
+ 2021-07-20 d568e6e075 runtime/debug: skip TestPanicOnFault on netbsd/arm
Change-Id: I87e1cd4614bb3b00807f18dfdd02664dcaecaebd
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This avoids a race when a new timerModifiedEarlier timer is created by
a different goroutine.
Fixes #47329
Change-Id: I6f6c87b4a9b5491b201c725c10bc98e23e0ed9d1
Reviewed-on: https://go-review.googlesource.com/c/go/+/336432
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Michael Knyszek <mknyszek@google.com>
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It was not safe to do mcache profiling updates outside the critical
section, but we got lucky because the runtime was not preemptible.
Adding chunked memory clearing (CL 270943) created preemption
opportunities, which led to corruption of runtime data structures.
Fixes #47304.
Fixes #47302.
Change-Id: I461615470d62328a83ccbac537fbdc6dcde81c85
Reviewed-on: https://go-review.googlesource.com/c/go/+/336449
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
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Remaining stuff from Dan's CL 335412 to get tests passing.
- Removed PTRLIT case in node() that was added with the gcshape change.
I don't think it is needed anymore.
- Modified (*itab).init() to add an irrelevant pointer (the itab
itself) for the '==' entry of interfaces with 'comparable'. That
entry is not used, so we just want to avoid the error that the given
type doesn't actually have an '==' method.
Change-Id: I9b2d4c8342c0b2048d76e003d95023f4ccd559f5
Reviewed-on: https://go-review.googlesource.com/c/go/+/336149
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
Trust: Dan Scales <danscales@google.com>
Trust: Keith Randall <khr@golang.org>
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Conflicts:
- src/runtime/internal/sys/zgoarch_386.go
- src/runtime/internal/sys/zgoarch_amd64.go
- src/runtime/internal/sys/zgoarch_arm.go
- src/runtime/internal/sys/zgoarch_arm64.go
- src/runtime/internal/sys/zgoarch_arm64be.go
- src/runtime/internal/sys/zgoarch_armbe.go
- src/runtime/internal/sys/zgoarch_mips.go
- src/runtime/internal/sys/zgoarch_mips64.go
- src/runtime/internal/sys/zgoarch_mips64le.go
- src/runtime/internal/sys/zgoarch_mips64p32.go
- src/runtime/internal/sys/zgoarch_mips64p32le.go
- src/runtime/internal/sys/zgoarch_mipsle.go
- src/runtime/internal/sys/zgoarch_ppc.go
- src/runtime/internal/sys/zgoarch_ppc64.go
- src/runtime/internal/sys/zgoarch_ppc64le.go
- src/runtime/internal/sys/zgoarch_riscv.go
- src/runtime/internal/sys/zgoarch_riscv64.go
- src/runtime/internal/sys/zgoarch_s390.go
- src/runtime/internal/sys/zgoarch_s390x.go
- src/runtime/internal/sys/zgoarch_sparc.go
- src/runtime/internal/sys/zgoarch_sparc64.go
- src/runtime/internal/sys/zgoarch_wasm.go
On dev.typeparams, CL 328336 moved these files to internal/goarch;
whereas on master, CL 333909 reserved GOARCH=loong64. For this CL,
I resolved the conflict by simply running "go generate internal/goarch".
Merge List:
+ 2021-07-19 c8f4e6152d spec: correct example comment in Conversions from slice to array
+ 2021-07-19 1d91551b73 time: correct typo in documentation for UnixMicro
+ 2021-07-19 404127c30f cmd/compile: fix off-by-one error in traceback argument counting
+ 2021-07-19 6298cfe672 cmd/compile: fix typo in fatal message of builtinCall
+ 2021-07-19 49402bee36 cmd/{compile,link}: fix bug in map.zero handling
+ 2021-07-18 a66190ecee test/bench/go1: fix size for RegexpMatchMedium_32
+ 2021-07-18 650fc2117a text/scanner: use Go convention in Position doc comment
+ 2021-07-16 aa4e0f528e net/http: correct capitalization in cancelTimeBody comment
+ 2021-07-15 0941dbca6a testing: clarify in docs that TestMain is advanced
+ 2021-07-15 69728ead87 cmd/go: update error messages in tests to match CL 332573
+ 2021-07-15 c1cc9f9c3d cmd/compile: fix lookup package of redeclared dot import symbol
+ 2021-07-15 21a04e3335 doc/go1.17: mention GOARCH=loong64
+ 2021-07-14 2b00a54baf go/build, runtime/internal/sys: reserve GOARCH=loong64
+ 2021-07-14 60ddf42b46 cmd/go: change link in error message from /wiki to /doc.
+ 2021-07-13 d8f348a589 cmd/go: remove a duplicated word from 'go help mod graph'
+ 2021-07-12 a98589711d crypto/tls: test key type when casting
+ 2021-07-12 cfbd73ba33 doc/go1.17: editing pass over the "Compiler" section
+ 2021-07-09 ab4085ce84 runtime/pprof: call runtime.GC twice in memory profile test
Change-Id: I1490a4c7e4c560659c21a4eb67d243f35d1f908e
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This test has been failing since the builder was updated to
NetBSD 9. While the issue is under investigation, skip the test
so that we do not miss other breakage.
Update issue #45026
Change-Id: Id083901c517f3f88e6b4bc2b51208f65170d47a6
Reviewed-on: https://go-review.googlesource.com/c/go/+/335909
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Benny Siegert <bsiegert@gmail.com>
Run-TryBot: Benny Siegert <bsiegert@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
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