Add export functions to the wasm module on GOOS=js. (Other parts
work the same way as wasip1.)
Add a test.
Fixes#65199.
Change-Id: Ia22580859fe40631d487f70ee293c12867e0c988
Reviewed-on: https://go-review.googlesource.com/c/go/+/606855
Reviewed-by: Zxilly Chou <zxilly@outlook.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
When running a go binary compiled to wasm using node.js on a Windows platform,
the absolute path passed in is also incorrectly forced to expand.
For example:
E:\Project\CS_Project\gsv\testdata\result.gob.gz
will results to
open C:\Users\zxilly\AppData\Local\wasm-exec\go1.23rc1\E:\Project\CS_Project\gsv\testdata\result.gob.gz: No such file or directory
C:\Users\zxilly\AppData\Local\wasm-exec\go1.23rc1 is the place of
wasm_exec_node.js
Fixes: #68820
Change-Id: Ic30c6242302f8915ac1b8ea9f24546935cbb791e
GitHub-Last-Rev: f35ff1a2ee
GitHub-Pull-Request: golang/go#68255
Reviewed-on: https://go-review.googlesource.com/c/go/+/595797
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For Go 1.23, we decided to no longer support the old CLI interface
exposed by wasmtime. This removes the extra logic included to support
both the new and the old CLI interface. Now only versions of wasmtime
14 and newer are supported.
Fixes#63718
Change-Id: Iea31388dc41bc8d73caa923c7e4acae2228bf515
Reviewed-on: https://go-review.googlesource.com/c/go/+/577135
Reviewed-by: Randy Reddig <randy.reddig@fastly.com>
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Reviewed-by: Carlos Amedee <carlos@golang.org>
Wasmtime 14.0.0 introduced new CLI flags and removed the existing
flags, in particular the --max-wasm-stack flag we were using to avoid
errors in some tests.
This introduces a regular expression based switch that uses the old
flags for wasmtime versions < 14 and the new flags otherwise.
Fixes#63718
Change-Id: I44673e7d9f8729065757abdbf8c41e8a61897d6a
Reviewed-on: https://go-review.googlesource.com/c/go/+/541219
Reviewed-by: David Chase <drchase@google.com>
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Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
The latest version of Wasmtime, 14.0.4 as of writing this, offers a new
CLI while also supporting the old CLI. Since this is known and tracked
in issue #63718, silence the warning that otherwise causes many tests
to fail.
Since Wasmtime 13 and older don't pay attention to WASMTIME_NEW_CLI,
this change increases compatibility of the script, letting it work
with Wasmtime 9.0.1 as currently tested by the old cmd/coordinator, and
with Wasmtime 14.0.4 as currently tested in the new LUCI infrastructure.
The rest of the transition is left as future work.
For #63718.
For #61116.
Change-Id: I77d4f74cc1d34a657e48dcaaceb6fbda7d1e9428
Cq-Include-Trybots: luci.golang.try:gotip-wasip1-wasm_wasmtime
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The default WASI runtime was originally set to Wazero, because it was
the first runtime used to test the Go implementation and because we
could easily find and fix issues in our implementation and theirs.
In CL 498675 we switched the default wasip1 runner to Wasmtime as it
runs faster and is a more established and mature runtime. We should
switch the default runtime to Wasmtime to consistently promote
Wasmtime as the primary tested and approved runtime.
Change-Id: Ic6c064142321af90f015e02b7fe0e71444d8842c
Reviewed-on: https://go-review.googlesource.com/c/go/+/513235
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Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
The PATH variable is required to run the testenv tests.
Set it for all the runtime invocations where we don't
already set it by inheriting from the environment.
For #59583
For #59907
For #60097
Change-Id: If582dd8f086e3f40bc58d555f6034dcffe6f8e5f
Reviewed-on: https://go-review.googlesource.com/c/go/+/498616
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Implements net.FileListener and net.FileConn for wasip1.
net.FileListener can be used with a pre-opened socket. If the WASM
module knows the file descriptor, a listener can be constructed with:
l, err := net.FileListener(os.NewFile(fd, ""))
If the WASM module does not know the file descriptor, but knows that at
least one of the preopens is a socket, it can find the file descriptor
and construct a listener like so:
func findListener() (net.Listener, error) {
// We start looking for pre-opened sockets at fd=3 because 0, 1,
// and 2 are reserved for stdio. Pre-opened directories also
// start at fd=3, so we skip fds that aren't sockets. Once we
// reach EBADF we know there are no more pre-opens.
for preopenFd := uintptr(3); ; preopenFd++ {
l, err := net.FileListener(os.NewFile(preopenFd, ""))
var se syscall.Errno
switch errors.As(err, &se); se {
case syscall.ENOTSOCK:
continue
case syscall.EBADF:
err = nil
}
return l, err
}
}
A similar strategy can be used with net.FileConn and pre-opened
connection sockets.
The wasmtime runtime supports pre-opening listener sockets:
$ wasmtime --tcplisten 127.0.0.1:8080 module.wasm
Change-Id: Iec6ae4ffa84b3753cce4f56a2817e150445db643
Reviewed-on: https://go-review.googlesource.com/c/go/+/493358
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Implements netpoll using WASI's poll_oneoff system call.
This enables non-blocking I/O support for wasip1.
Change-Id: Ie395fa49d651c8b8262d485e2847dd65b0a10bc6
Reviewed-on: https://go-review.googlesource.com/c/go/+/493357
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
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Reviewed-by: Julien Fabre <ju.pryz@gmail.com>
Auto-Submit: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
The existing implementation clears and recreates Javascript
timeouts when Go is called from js, leading to excessive
load on the js scheduler. Instead, we should remove redundant
calls to clearTimeout and refrain from creating new timeouts
if the previous event's timestamp is within 1 millisecond of
our target (the js scheduler's max precision)
Fixes#56100
Change-Id: I42bbed4c2f1fa6579c1f3aa519b6ed8fc003a20c
Reviewed-on: https://go-review.googlesource.com/c/go/+/442995
Reviewed-by: Michael Knyszek <mknyszek@google.com>
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The wasmedge runtime will be used to test our wasip1
implementation against the WASI runtime from wasmedge.org.
For #60097
Change-Id: Ib0e886de46240b4d43d02ec8a7bc7cea0730c162
Reviewed-on: https://go-review.googlesource.com/c/go/+/494120
Reviewed-by: Cherry Mui <cherryyz@google.com>
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The wasmer runtime will be used to test our wasip1
implementation against the WASI runtime from wasmer.io.
For #59907
Change-Id: Ie7e48c39e03075815ddca46d996b6ec87009b12a
Reviewed-on: https://go-review.googlesource.com/c/go/+/493775
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Allow switching to wasmtime through the GOWASIRUNTIME variable. This
will allow builders to run the wasip1 standard library tests against
the wasmtime WASI runtime.
For #59583
Change-Id: I4d5200df7bb27b66e041f00e89d4c2e585f5da7c
Reviewed-on: https://go-review.googlesource.com/c/go/+/485615
Reviewed-by: Bryan Mills <bcmills@google.com>
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This script uses Wazero, the open source, zero dependencies
pure Go Wasm and WASI runtime. This is the runtime that allows
the greatest number of standard library tests to pass.
For #58141
Co-authored-by: Richard Musiol <neelance@gmail.com>
Co-authored-by: Achille Roussel <achille.roussel@gmail.com>
Co-authored-by: Julien Fabre <ju.pryz@gmail.com>
Co-authored-by: Evan Phoenix <evan@phx.io>
Change-Id: I789465ae4daf2b380f3c05a9365b8d449c6af56c
Reviewed-on: https://go-review.googlesource.com/c/go/+/479620
Reviewed-by: Ian Lance Taylor <iant@google.com>
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Go programs can now use the //go:wasmimport module_name function_name
directive to import functions from the WebAssembly runtime.
For now, the directive is restricted to the runtime and syscall/js
packages.
* Derived from CL 350737
* Original work modified to work with changes to the IR conversion code.
* Modification of CL 350737 changes to fully exist in Unified IR path (emp)
* Original work modified to work with changes to the ABI configuration code.
* Fixes#38248
Co-authored-by: Vedant Roy <vroy101@gmail.com>
Co-authored-by: Richard Musiol <mail@richard-musiol.de>
Co-authored-by: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
Change-Id: I740719735d91c306ac718a435a78e1ee9686bc16
Reviewed-on: https://go-review.googlesource.com/c/go/+/463018
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The default NodeJS V8 stack size is 984K, which is not enough to run
the regexp or go/parser tests. This commit increases the stack size
to 8192K, which removes the stack size limit error.
Fixes#56498Fixes#57614
Change-Id: I357885d420daf259187403deab25ff587defa0fc
Reviewed-on: https://go-review.googlesource.com/c/go/+/463994
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
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The move to NodeJS 18 allows us to replace the custom
crypto functions with the expanded crypto primitives of
the NodeJS crypto library.
Fixes#56860
Change-Id: I8726b4003150f31521f246f613b6976641b9fa69
Reviewed-on: https://go-review.googlesource.com/c/go/+/463975
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Evan Phoenix <evan@phx.io>
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The path /bin/bash is not available on all operating systems.
Use /usr/bin/env bash to find the system bash interpreter.
Change-Id: I493e462a8e261b7fbbd3f3c0b1d10e55c5ed783b
Reviewed-on: https://go-review.googlesource.com/c/go/+/463977
Reviewed-by: Bryan Mills <bcmills@google.com>
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Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Evan Phoenix <evan@phx.io>
The upgrade to NodeJS 18 introduces various library
updates that mean we can no longer override the global
performance package. Instead, rely on the performance
library provided by the NodeJS runtime.
Fixes#57516
Change-Id: Ic8ed902c696ad154f676e0b74b42efb84f02f8db
Reviewed-on: https://go-review.googlesource.com/c/go/+/463234
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String.prototype.substr is deprecated and usage is no longer
recommended so using String.prototype.substring instead.
Change-Id: I9eb49a8c065890df73301e3a04af59f550bc3ae1
Reviewed-on: https://go-review.googlesource.com/c/go/+/406094
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On wasm, the wasm_exec.js helper passes the command line arguments and
environment variables via a reserved space in the wasm linear memory.
Increase this reserved space from 4096 to 8192 bytes so more environment
variables can fit into the limit.
Later, after https://golang.org/cl/350737 landed, we can switch to the
WASI interface for getting the arguments and environment. This would
remove the limit entirely.
Fixes#49011
Change-Id: I48a6e952a97d33404ed692c98e9b49c5cd6b269b
Reviewed-on: https://go-review.googlesource.com/c/go/+/358194
Trust: Richard Musiol <neelance@gmail.com>
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The list of environments to support with wasm_exec.js was becoming too
large to maintain. With this change, wasm_exec.js expects that the
environment provides all necessary polyfills.
The standardized "globalThis" is used for accessing the environment.
wasm_exec.js now only provides stub fallbacks for globalThis.fs and
globalThis.process.
All code specific to Node.js is now in a separate file.
Change-Id: I076febbd94d4d7845260faad972f450f74a7b983
Reviewed-on: https://go-review.googlesource.com/c/go/+/347353
Trust: Richard Musiol <neelance@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
On Wasm, wasm_exec.js puts command line arguments at the beginning
of the linear memory (following the "zero page"). Currently there
is no limit for this, and a very long command line can overwrite
the program's data section. Prevent this by limiting the command
line to 4096 bytes, and in the linker ensuring the data section
starts at a high enough address (8192).
(Arguably our address assignment on Wasm is a bit confusing. This
is the minimum fix I can come up with.)
Thanks to Ben Lubar for reporting this issue.
Fixes#48797
Fixes CVE-2021-38297
Change-Id: I0f50fbb2a5b6d0d047e3c134a88988d9133e4ab3
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1205933
Reviewed-by: Roland Shoemaker <bracewell@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/354571
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
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Current wasm_exec.js does not enable ECMAScript strict mode. But it is
recommended to be enabled because it
1. eliminates some ECMAScript silent errors by changing them to throw
errors
2. fixes mistakes that make it difficult for JavaScript engines to
perform optimizations
3. prohibits some syntax likely to be defined in future versions of
ECMAScript
This commit enables ECMAScript strict mode in wasm_exec.js following the
transition guide:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode/Transitioning_to_strict_modeFixes#47116
Change-Id: Ib8ffceee37e9127698fb51304241f1e429efe83e
Reviewed-on: https://go-review.googlesource.com/c/go/+/334269
Reviewed-by: Richard Musiol <neelance@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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The stack pointer may have changed after a call from JavaScript into Go
code because of stack growth. The normal case already updated the
sp variable accordingly, but the catch case did not yet.
Fixes#45433
Change-Id: I3e0a33381929626f6b21902948935eb5ffb26c96
Reviewed-on: https://go-review.googlesource.com/c/go/+/321936
Trust: Richard Musiol <neelance@gmail.com>
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Change-Id: Iec9de5ca56eb68d524bbaa0668515dbd09ad38a1
Reviewed-on: https://go-review.googlesource.com/c/go/+/314770
Trust: Ian Lance Taylor <iant@golang.org>
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This results in a nicer error message if the argument to Go.run is
omitted or of the wrong type.
Fixes#37000
Change-Id: I7f36d007f41a79b2cea1cebf5cce127786341202
Reviewed-on: https://go-review.googlesource.com/c/go/+/266117
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wasm_exec.js expects that either "require" is available or that the
globals "crypto", "TextEncoder" and "TextDecoder" are already defined.
Report a better error message if this is not the case, suggesting the
use of a polyfill.
Updates #41482
Change-Id: I5473cae15c98ae42e39f5928245b7762e7a5a8bf
Reviewed-on: https://go-review.googlesource.com/c/go/+/261357
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An i32 passed from WebAssembly to JavaScript is always read as a signed
integer. Use the bitshift operator to turn it into an unsigned integer.
Fixes#40923
Change-Id: Ia91ed2145dd2fc3071e2fc22b86ebfcb3c1e9f4f
Reviewed-on: https://go-review.googlesource.com/c/go/+/261358
Trust: Richard Musiol <neelance@gmail.com>
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JavaScript environments are quite unpredictable because bundlers add
mocks for compatibility and libraries can polute the global namespace.
Detect more of such situations:
- Add check that require("fs") returns an object.
- Fix check that require("fs") returns an non-empty object.
- Add check that "module" is defined.
Fixes#40730
Change-Id: I2ce65fc7db64bbbb0b60eec79a4cfe5c3fec99c0
Reviewed-on: https://go-review.googlesource.com/c/go/+/248758
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In Webpack, require("fs") will always be empty. This behavior throws an error: "fs.writeSync is not function". It happens when you did "fmt.Println".
This PR avoids such problem and use polyfill in wasm_exec.js on Webpack.
Change-Id: I55f2c75ce86b7f84d2d92e8e217b5decfbe3c8a1
GitHub-Last-Rev: aecc847e3f
GitHub-Pull-Request: golang/go#35805
Reviewed-on: https://go-review.googlesource.com/c/go/+/208600
Reviewed-by: Richard Musiol <neelance@gmail.com>
The js.Value struct now contains a pointer, so a finalizer can
determine if the value is not referenced by Go any more.
Unfortunately this breaks Go's == operator with js.Value. This change
adds a new Equal method to check for the equality of two Values.
This is a breaking change. The == operator is now disallowed to
not silently break code.
Additionally the helper methods IsUndefined, IsNull and IsNaN got added.
Fixes#35111
Change-Id: I58a50ca18f477bf51a259c668a8ba15bfa76c955
Reviewed-on: https://go-review.googlesource.com/c/go/+/203600
Run-TryBot: Richard Musiol <neelance@gmail.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
When running wasm in the browser, the "process" global is not defined.
This causes functions like os.Getpid() to panic, which is unusual.
For example on Windows os.Getpid() returns -1 and does not panic.
This change adds a dummy polyfill for "process" which returns -1 or an
error. It also extends the polyfill for "fs".
Fixes#34627
Replaces CL 199357
Change-Id: Ifeb12fe7e152c517848933a9ab5f6f749896dcef
Reviewed-on: https://go-review.googlesource.com/c/go/+/199698
Run-TryBot: Richard Musiol <neelance@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
The wasm_exec.js wrapper tries to set up the argv and envp following
the UNIX conventions, but doesn't get it quite right, which can cause
runtime.goenv to crash if you get unlucky.
The main problem was that the envp array wasn't terminated with a nil
pointer, so the runtime didn't know when to stop reading the array.
This CL adds that nil pointer to the end of the envp array.
The other problem was harmless, but confusing. In the UNIX convention,
the argv array consists of argc pointers followed by a nil pointer,
followed by the envp array. However, wasm_exec.js put the environment
variable count between the two pointer arrays rather than a nil
pointer. The runtime never looks at this slot, so it didn't matter,
but the break from convention left Cherry and I trying to debug why it
*wasn't* losing any environment variables before we realized that that
layouts happened to be close enough to work. This CL switches to the
UNIX convention of simply terminating the argv array with a nil
pointer.
Change-Id: Ic9a4cd9eabb5dfa599a809b960f9e579b9f1f4db
Reviewed-on: https://go-review.googlesource.com/c/go/+/193417
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Richard Musiol <neelance@gmail.com>
In preparation for general faketime support, this renames the existing
nanotime, walltime, and write functions to nanotime1, walltime1, and
write1 and wraps them with trivial Go functions. This will let us
inject different implementations on all platforms when faketime is
enabled.
Updates #30439.
Change-Id: Ice5ccc513a32a6d89ea051638676d3ee05b00418
Reviewed-on: https://go-review.googlesource.com/c/go/+/192738
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
The typed arrays returned by TypedArrayOf were backed by WebAssembly
memory. They became invalid each time we grow the WebAssembly memory.
This made them very error prone and hard to use correctly.
This change removes TypedArrayOf completely and instead introduces
CopyBytesToGo and CopyBytesToJS for copying bytes between a byte
slice and an Uint8Array. This breaking change is still allowed for
the syscall/js package.
Fixes#31980.
Fixes#31812.
Change-Id: I14c76fdd60b48dd517c1593972a56d04965cb272
Reviewed-on: https://go-review.googlesource.com/c/go/+/177537
Run-TryBot: Richard Musiol <neelance@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Command line arguments containing multi-byte characters were causing
go_js_wasm_exec to crash (RangeError: Source is too large), because
their byte length was not handled correctly. This change fixes the bug.
Fixes#31645.
Change-Id: I7860ebf5b12da37d9d0f43d4b6a22d326a90edaf
Reviewed-on: https://go-review.googlesource.com/c/go/+/173877
Run-TryBot: Richard Musiol <neelance@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
go_js_wasm_exec was returning with code 0 if WebAssembly.instantiate
failed. This made failing tests show as passed.
Change-Id: Icfb2f42e9f1c3c70ca4a130a61a63cb305edff32
Reviewed-on: https://go-review.googlesource.com/c/go/+/168885
Run-TryBot: Richard Musiol <neelance@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
TryBot is sometimes running into deadlocks on js/wasm. We haven't been
able to reproduce them yet. This workaround is an experiment to resolve
these deadlocks by retrying a missed timeout event.
A timeout event is scheduled by Go to be woken by JavaScript after a
certain amount of time. The checkTimeouts function then checks which
notes to wake by comparing their deadline to nanotime. If this
check fails erroneously then the note may stay asleep forever, causing
a deadlock. This may or may not be the reason of the observed
deadlocks.
Updates #28975.
Change-Id: I46b9d4069307142914f0e7b3acd4e65578319f0b
Reviewed-on: https://go-review.googlesource.com/c/go/+/167119
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This change adds support for using wasm with Electron. It refactors
environment detection to a more modular approach instead of explicitly
testing for Node.js.
Fixes#29404
Change-Id: I882a9c56523744e7fd7cb2013d158df91cf91d14
Reviewed-on: https://go-review.googlesource.com/c/164665
Run-TryBot: Richard Musiol <neelance@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
The name "Callback" does not fit to all use cases of js.Callback.
This commit changes its name to Func. Accordingly NewCallback
gets renamed to FuncOf, which matches ValueOf and TypedArrayOf.
The package syscall/js is currently exempt from Go's compatibility
promise and js.Callback is already affected by a breaking change in
this release cycle. See #28711 for details.
Fixes#28711
Change-Id: I2c380970c3822bed6a3893909672c15d0cbe9da3
Reviewed-on: https://go-review.googlesource.com/c/153559
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Using fmt.Scanln in a browser environment caused a panic, since there
was no stub for fs.read. This commit adds a stub that returns ENOSYS.
Fixes#27773.
Change-Id: I79b019039e4bc90da51d71a4edddf3bd7809ff45
Reviewed-on: https://go-review.googlesource.com/c/150617
Run-TryBot: Richard Musiol <neelance@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
os.TempDir() did not return a proper directory on Windows with js/wasm,
because js/wasm only uses the Unix variant of TempDir.
This commit passes the temporary directory provided by Node.js to the
Go runtime by adding it as a default value for the TMPDIR environment
variable. It makes TempDir compatible with all platforms.
Fixes#27306.
Change-Id: I8b17e44cfb2ca41939ab2a4f918698fe330cb8bc
Reviewed-on: https://go-review.googlesource.com/c/150437
Run-TryBot: Richard Musiol <neelance@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
