This CL adds the following instructions, useful for shifting/rotating
and masking operations:
* RNSBG - rotate then and selected bits
* ROSBG - rotate then or selected bits
* RXSBG - rotate then exclusive or selected bits
* RISBG - rotate then insert selected bits
It also adds the 'T' (test), 'Z' (zero), 'H' (high), 'L' (low) and
'N' (no test) variants of these instructions as appropriate.
Operands are ordered as: I₃, I₄, I₅, R₂, R₁.
Key: I₃=start, I₄=end, I₅=amount, R₂=source, R₁=destination
Change-Id: I200d12287e1df7447f37f4919da5e9a93d27c792
Reviewed-on: https://go-review.googlesource.com/c/go/+/159357
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Allow up to 3 RestArgs arguments to be specified. This is needed to
for us to add the 'rotate and ... bits' instructions, which require
5 arguments, cleanly.
Change-Id: I76b89adfb5e3cd85a43023e412f0cc202d489e0b
Reviewed-on: https://go-review.googlesource.com/c/go/+/171726
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
The param field isn't useful, we can just use REGSP instead.
Change-Id: I2ac68131c390209cc84e43aa7620ccbf5ae69120
Reviewed-on: https://go-review.googlesource.com/c/go/+/171725
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
For prose consistency with other documentation.
Change-Id: I1588fbe1feace2a97b02b20bba730ed730b84fa3
Reviewed-on: https://go-review.googlesource.com/c/go/+/171772
Run-TryBot: Ross Light <light@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Since golang.org/cl/32487, treecopy does not handle non-iota ONONAME and
iota ONONAME anymore.
Change-Id: Icd5a81333a0d4d04adef2dbc58db92ce67aa0860
Reviewed-on: https://go-review.googlesource.com/c/go/+/172038
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
The existing pclntab construction took care to re-use strings:
filenames and fully qualified function names.
It did not try to deduplicate pctab information,
perhaps because the author assumed that there
wouldn't be much duplication.
This change introduces that deduplication.
The cache gets a 33% hit rate during make.bash.
This doesn't require any changes to the file format,
and shrinks binaries by about 1%.
Updates #6853
file before after Δ %
go 14659236 14515876 -143360 -0.978%
addr2line 4272424 4223272 -49152 -1.150%
api 6050808 5993464 -57344 -0.948%
asm 4906416 4869552 -36864 -0.751%
buildid 2861104 2824240 -36864 -1.288%
cgo 4859784 4810632 -49152 -1.011%
compile 25749656 25213080 -536576 -2.084%
cover 5286952 5229608 -57344 -1.085%
dist 3634192 3597328 -36864 -1.014%
doc 4691080 4641928 -49152 -1.048%
fix 3397960 3361096 -36864 -1.085%
link 6113568 6064432 -49136 -0.804%
nm 4221928 4172776 -49152 -1.164%
objdump 4636600 4587448 -49152 -1.060%
pack 2281184 2256608 -24576 -1.077%
pprof 14641204 14485556 -155648 -1.063%
test2json 2814536 2785864 -28672 -1.019%
trace 11602204 11487516 -114688 -0.989%
vet 8399528 8313512 -86016 -1.024%
Change-Id: I59c6aae522700a0d36ddd2cbca6e22ecdf17eea2
Reviewed-on: https://go-review.googlesource.com/c/go/+/172079
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Rearranged code slightly to make lifetime of underlying array of
pow5 more explicit in code.
Fixes#31184.
Change-Id: I063081f0e54097c499988d268a23813746592654
Reviewed-on: https://go-review.googlesource.com/c/go/+/170641
Reviewed-by: Filippo Valsorda <filippo@golang.org>
This CL adds a new escape analysis implementation, which can be
enabled through the -newescape compiler flag.
This implementation focuses on simplicity, but in the process ends up
using less memory, speeding up some compile-times, fixing memory
corruption issues, and overall significantly improving escape analysis
results.
Updates #23109.
Change-Id: I6176d9a7ae9d80adb0208d4112b8a1e1f4c9143a
Reviewed-on: https://go-review.googlesource.com/c/go/+/170322
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
On Ubuntu 18.04 I am seeing GDB fail to restore the stack pointer
during this test because stack unwinding can't find the PC. This CL
is essentially a partial revert of CL 23940 and fixes the issue on
s390x.
Change-Id: Ib4c41162dc85dc882eb6e248330f4082c3fa94c3
Reviewed-on: https://go-review.googlesource.com/c/go/+/169857
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This CL adds a new attribute, TOPFRAME, which can be used to mark
functions that should be treated as being at the top of the call
stack. The function `runtime.goexit` has been marked this way on
architectures that use a link register.
This will stop programs that use DWARF to unwind the call stack
from unwinding past `runtime.goexit` on architectures that use a
link register. For example, it eliminates "corrupt stack?"
warnings when generating a backtrace that hits `runtime.goexit`
in GDB on s390x.
Similar code should be added for non-link-register architectures
(i.e. amd64, 386). They mark the top of the call stack slightly
differently to link register architectures so I haven't added
that code (they need to mark "rip" as undefined).
Fixes#24385.
Change-Id: I15b4c69ac75b491daa0acf0d981cb80eb06488de
Reviewed-on: https://go-review.googlesource.com/c/go/+/169726
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Telling whether a string is a valid Go identifier can seem like an easy
task, but it's easy to forget about the edge cases. For example, some
implementations out there forget that an empty string or keywords like
"func" aren't valid identifiers.
Add a simple implementation with proper Unicode support, and start using
it in cmd/cover and cmd/doc. Other pieces of the standard library
reimplement part of this logic, but don't use a "func(string) bool"
signature, so we're leaving them untouched for now.
Add some tests too, to ensure that we actually got these edge cases
correctly.
Since telling whether a string is a valid identifier requires knowing
that it's not a valid keyword, add IsKeyword too. The internal map was
already accessible via Lookup, but "Lookup(str) != IDENT" isn't as easy
to understand as IsKeyword(str). And, as per Josh's suggestion, we could
have IsKeyword (and probably Lookup too) use a perfect hash function
instead of a global map.
Finally, for consistency with these new functions, add IsExported. That
makes go/ast.IsExported a bit redundant, so perhaps it can be deprecated
in favor of go/token.IsExported in the future. Clarify that
token.IsExported doesn't imply token.IsIdentifier, to avoid ambiguity.
Fixes#30064.
Change-Id: I0e0e49215fd7e47b603ebc2b5a44086c51ba57f7
Reviewed-on: https://go-review.googlesource.com/c/go/+/169018
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>
When string letters are all in lower/upper cases, both functions respectively
return original string.
Fixes#30987
Change-Id: Ie8d664f7af5e087f82c1bc156933e9a995645bf4
Reviewed-on: https://go-review.googlesource.com/c/go/+/171735
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Merge case statement for OpARMSLL, OpARMSRL and OpARMSRA into an
existing one using the same logic.
Change-Id: Ic4224668228902e5188fb0559b5f1949cfea1381
Reviewed-on: https://go-review.googlesource.com/c/go/+/171724
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
readValue is a hot function, clocking in at ~13% flat CPU use in
CodeDecoder. In particular, looping over the bytes is slow. That's
partially because the code contains a bounds check at the start of the
loop.
The source of the problem is that scanp is a signed integer, and comes
from a field, so the compiler doesn't know that it's non-negative. Help
it with a simple and comparatively cheap hint.
While at it, use scanp as the index variable directly, removing the need
for a duplicate index variable which is later added back into scanp.
name old time/op new time/op delta
CodeDecoder-8 11.3ms ± 1% 11.2ms ± 1% -0.98% (p=0.000 n=9+9)
name old speed new speed delta
CodeDecoder-8 172MB/s ± 1% 174MB/s ± 1% +0.99% (p=0.000 n=9+9)
Updates #28923.
Change-Id: I138f83babdf316fc97697cc18f595c3403c1ddb7
Reviewed-on: https://go-review.googlesource.com/c/go/+/170939
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Make 'go test' command to pass the default timeout (10m) to test programs if the value is not given from command line.
Fixes#28147
Change-Id: I7856e452224a51a92da03bab8e3a0f9d7c41d32a
GitHub-Last-Rev: 66f9a6f90e
GitHub-Pull-Request: golang/go#30545
Reviewed-on: https://go-review.googlesource.com/c/go/+/164963
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Rename it to PCIter and convert it to use methods.
Set pcscale once, during construction, to make call sites clearer.
Change some ints to bools.
Use a simple iteration termination condition,
instead of the cap comparison from the c2go translation.
Instead of requiring a Pcdata, which requires one caller
to synthesize a fake Pcdata, just ask for a byte slice.
Passes toolstash-check.
Change-Id: I811da0e929cf4a806bd6d70357ccf2911cd0c737
Reviewed-on: https://go-review.googlesource.com/c/go/+/171770
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This code was written before the c2go toolchain conversion.
Replace the handwritten varint encoding routines
and the handwritten unsigned-to-signed conversions
with calls to encoding/binary.
Passes toolstash-check.
Change-Id: I30d7f408cde3772ee98a3825e83075c4e1ec96d8
Reviewed-on: https://go-review.googlesource.com/c/go/+/171769
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
If preprocessing or assembling has failed, we should not proceed.
First, there's no point.
Second, I will shortly add some sanity checks to linkpcln
that will fail on malformed input.
Change-Id: I055eeab1c2f3a66b4b2cadb551bbf4ab55d176f4
Reviewed-on: https://go-review.googlesource.com/c/go/+/171886
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
On AIX, syscallX functions are using the first argument to retrieve the
next arguments when calling asmcgocall. Therefore,//go:cgo_unsafe_args
is needed.
Change-Id: I7fe0fbf0c961250a6573c66a8b0eb897dff94bfe
Reviewed-on: https://go-review.googlesource.com/c/go/+/171723
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This file was forgotten during the port of aix/ppc64. In order to make
its tests passed, a few things were added:
- Add termios.h to zerrors
- Add AF_LOCAL = AF_UNIX as this constant doesn't exits natively on AIX
- Fix the alignment in cmsghdr structure.
TestPassFD doesn't work on AIX TL<2 because getsockname isn't working as
expected with unix socket.
Change-Id: I928705bfc78ada29e66df61fe97d8f379f8c739b
Reviewed-on: https://go-review.googlesource.com/c/go/+/171339
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
The previous version was executing "oslevel -s" everytime testableNetwork
was called with unix/unixgram network. The current version retrieves if
the network is possible only once at the beginning of the tests.
This is clearly faster:
ok net 74.045s
ok net 5.098s
Change-Id: I12549da27721f85c007cf17cab5cfdbfeb839cf6
Reviewed-on: https://go-review.googlesource.com/c/go/+/171717
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Since CL 170941 bootstrap.bash fails if no exec wrapper exists for a
given GOOS/GOARCH yet:
#### Building ../../go-linux-arm-bootstrap
Building Go cmd/dist using /usr/local/go.
Building Go toolchain1 using /usr/local/go.
Building Go bootstrap cmd/go (go_bootstrap) using Go toolchain1.
Building Go toolchain2 using go_bootstrap and Go toolchain1.
Building Go toolchain3 using go_bootstrap and Go toolchain2.
Building packages and commands for host, linux/amd64.
Building packages and commands for target, linux/arm.
rm: cannot remove 'bin/go_linux_arm_exec': No such file or directory
Fix it by using 'rm -f' to ignore nonexisting files.
Change-Id: Ib4b1e19747052fa4dca06319f35cc25a0545c4f7
Reviewed-on: https://go-review.googlesource.com/c/go/+/171722
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Elias Naur <mail@eliasnaur.com>
Inside syscall_syscall6 function, libcall can directly be on the stack.
This is first function called with //go:nosplit, unlike runtime syscalls
which can be called during the sigtramp or by others //go:nosplit
functions.
Change-Id: Icc28def1a63e525850ec3bfb8184b995dfeaa736
Reviewed-on: https://go-review.googlesource.com/c/go/+/171338
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Failures here don't otherwise affect the build, but they do cause a
slow file leak in the user's temp directory. The user deserves at
least a cursory warning that something may be amiss.
Updates #30789
Change-Id: Id0e72b1967e7f7c88cdc94d532554496653f264b
Reviewed-on: https://go-review.googlesource.com/c/go/+/171764
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
procresize is rather ungainly because it includes all of the code to
initialize new Ps and tear down unused Ps. Pull these out into their
own methods on the p type. This also tweaks the initialization loop in
procresize so we only initialize new Ps (and Ps we previously
destroyed) rather than asking each P "have you been initialized?"
This is for #10958 and #24543, but it's also just a nice cleanup.
Change-Id: Ic1242066f572c94a23cea8ea4dc47c918e31d559
Reviewed-on: https://go-review.googlesource.com/c/go/+/171762
Reviewed-by: Michael Knyszek <mknyszek@google.com>
The code to swap RemoveAllTestHook in and out in
TestRemoveAllWithMoreErrorThanReqSize was making a copy of the
RemoveAllTestHook pointer, then attempting to restore by loading from
the copy of that pointer. Since the two copies of the pointer aliased
the same address, the restore operation had no effect, and any
RemoveAll tests that happened to run after
TestRemoveAllWithMoreErrorThanReqSize would fail.
Fixes#31421
Change-Id: I7028475f5ceb3b0a2fa69d22af8d3379508c4531
Reviewed-on: https://go-review.googlesource.com/c/go/+/171777
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
For a failed interface conversion not in ",ok" form, getitab
calls itab.init to get the name of the missing method for the
panic message. itab.init will try to find the methods, populate
the method table as it goes. When some method is missing, it sets
itab.fun[0] to 0 before return. There is a small window that
itab.fun[0] could be non-zero.
If concurrently, another goroutine tries to do the same interface
conversion, it will read the same itab's fun[0]. If this happens
in the small window, it sees a non-zero fun[0] and thinks the
conversion succeeded, which is bad.
Fix the race by setting fun[0] to non-zero only when we know the
conversion succeeds. While here, also simplify the syntax
slightly.
Fixes#31419.
Change-Id: Ied34d3043079eb933e330c5877b85e13f98f1916
Reviewed-on: https://go-review.googlesource.com/c/go/+/171759
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
freebsd and netbsd require a minimum buffer size of 1K.
Note this doesn't quite fix freebsd, it has other bugs,
I'll file a separate issue.
Fixes#31403
Change-Id: I9d7e78f6d30859b34715afadc4b8bd3b1ecc606b
Reviewed-on: https://go-review.googlesource.com/c/go/+/171757
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
These workarounds predate proper DWARF support
and are no longer necessary.
Before this patch, running `/usr/bin/symbols go.o`
using the object in the c-archive would fail, causing
App Store rejections.
Fixes#31022#28997
Change-Id: I6a210b6369c13038777c6e21e874e81afcb50c2f
Reviewed-on: https://go-review.googlesource.com/c/go/+/170377
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Currently which treap a span should be inserted into/removed from is
checked by looking at the span's properties. This logic is repeated in
four places. As this logic gets more complex, it makes sense to
de-duplicate this, so introduce treapForSpan instead which captures this
logic by returning the appropriate treap for the span.
For #30333.
Change-Id: I4bd933d93dc50c5fc7c7c7f56ceb95194dcbfbcc
Reviewed-on: https://go-review.googlesource.com/c/go/+/170857
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
