This is an experiment to see if removing the boundary bit logic will
lead to fewer cache misses and improved performance. Instead of using
boundary bits we use the span information to get element size and use
some bit whacking to get the boundary without having to touch the
random heap bits which cause cache misses.
Furthermore once the boundary bit is removed we can either use that
bit for a simpler checkmark routine or we can reduce the number of
bits in the GC bitmap to 2 bits per pointer sized work. For example
the 2 bits at the boundary can be used for marking and pointer/scalar
differentiation. Since we don't need the mark bit except at the
boundary nibble of the object other nibbles can use this bit
as a noscan bit to indicate that there are no more pointers in
the object.
Currently the changed included in this CL slows down the garbage
benchmark. With the boundary bits garbage gives 5.78 and without
(this CL) it gives 5.88 which is a 2% slowdown.
Change-Id: Id68f831ad668176f7dc9f7b57b339e4ebb6dc4c2
Reviewed-on: https://go-review.googlesource.com/6665
Reviewed-by: Austin Clements <austin@google.com>
Shifts are trivially implemented by combining
Float.MantExp and Float.SetMantExp.
Change-Id: Ia2fb49297d8ea7aa7d64c8b1318dc3dc7c8af2f7
Reviewed-on: https://go-review.googlesource.com/6671
Reviewed-by: Alan Donovan <adonovan@google.com>
This change represents Accuracy as a bit pattern rather than
an ordered value; with a new value Undef which is both Below
and Above.
Change-Id: Ibb96294c1417fb3cf2c3cf2374c993b0a4e106b3
Reviewed-on: https://go-review.googlesource.com/6650
Reviewed-by: Alan Donovan <adonovan@google.com>
This change introduces NaNs (for situations like Inf-Inf, etc.).
The implementation is incomplete (the four basic operations produce
a NaN if any of the operands is an Inf or a NaN); and some operations
produce incorrect accuracy for NaN arguments. These are known bugs
which are documented.
Change-Id: Ia88841209e47930681cef19f113e178f92ceeb33
Reviewed-on: https://go-review.googlesource.com/6540
Reviewed-by: Alan Donovan <adonovan@google.com>
Gc already calculates n as an int, so converting to int64 to call
growslice doesn't serve any purpose except to emit slightly larger
code on 32-bit platforms. Passing n as an int shrinks godoc's text
segment by 8kB (9472633 => 9464133) when building for ARM.
Change-Id: Ief9492c21d01afcb624d3f2a484df741450b788d
Reviewed-on: https://go-review.googlesource.com/6231
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
SHRQ CX, DX:AX is changing to SHRQ CX, AX, DX.
This is the first step: using SHRQ From=CX, From3=AX, To=DX
as the preferred encoding.
Once the assemblers and 6g have been updated,
support for the old encoding can be removed.
Change-Id: Ie603fb8ac25a6df78e42f7ddcae078a7684a7c26
Reviewed-on: https://go-review.googlesource.com/6693
Reviewed-by: Rob Pike <r@golang.org>
The unbounded list-based defer pool can grow infinitely.
This can happen if a goroutine routinely allocates a defer;
then blocks on one P; and then unblocked, scheduled and
frees the defer on another P.
The scenario was reported on golang-nuts list.
We've been here several times. Any unbounded local caches
are bad and grow to infinite size. This change introduces
central defer pool; local pools become fixed-size
with the only purpose of amortizing accesses to the
central pool.
Freedefer now executes on system stack to not consume
nosplit stack space.
Change-Id: I1a27695838409259d1586a0adfa9f92bccf7ceba
Reviewed-on: https://go-review.googlesource.com/3967
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Dmitry Vyukov <dvyukov@google.com>
The unbounded list-based sudog cache can grow infinitely.
This can happen if a goroutine is routinely blocked on one P
and then unblocked and scheduled on another P.
The scenario was reported on golang-nuts list.
We've been here several times. Any unbounded local caches
are bad and grow to infinite size. This change introduces
central sudog cache; local caches become fixed-size
with the only purpose of amortizing accesses to the
central cache.
The change required to move sudog cache from mcache to P,
because mcache is not scanned by GC.
Change-Id: I3bb7b14710354c026dcba28b3d3c8936a8db4e90
Reviewed-on: https://go-review.googlesource.com/3742
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Dmitry Vyukov <dvyukov@google.com>
The original C code is: (x->type & SHIDDEN) ? 2 : 0, however when
cleaning up the code for c2go, the ternary operator is rewritten in
the exact opposite way.
We need a test for this, and that's being tracked as #10070.
Fixes#10067.
Change-Id: I24a5e021597d8bc44218c6e75bab6446513b76cf
Signed-off-by: Shenghou Ma <minux@golang.org>
Reviewed-on: https://go-review.googlesource.com/6730
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The creation of liblink and subsequent introduction of more explicit
TLS handling broke 6l's (unsupported) -shared flag. This change adds
-shared flags to cmd/asm and 6g and changes liblink to generate shared-
library compatible instruction sequences when they are passed, and
changes 6l to emit the appropriate ELF relocation.
A proper fix probably also requires go tool changes.
Fixes#9652.
Change-Id: I7b7718fe7305c802ac994f4a5c8de68cfbe6c76b
Reviewed-on: https://go-review.googlesource.com/4321
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The name g is an alias for R10 and R30, respectively. Have Rconv
print the alias, for consistency with the input language.
Change-Id: Ic3f40037884a0c8de5089d8c8a8efbcdc38c0d56
Reviewed-on: https://go-review.googlesource.com/6630
Reviewed-by: Minux Ma <minux@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
This will enable test sharding over multiple VMs, to speed trybot answers.
Update #10029
Change-Id: Ie277c6459bc38005e4d6af14d22effeaa0a4667e
Reviewed-on: https://go-review.googlesource.com/6531
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Just a missed case in in the handling of branches.
Fixes#10065
Change-Id: I6be054d30bf1f383c12b4c7626abd5f8ae22b22e
Reviewed-on: https://go-review.googlesource.com/6631
Reviewed-by: Minux Ma <minux@golang.org>
c2go produced accurate but complex constant definitions like
"ElfSymBindLocal = 0 + iota - 67" which break when any constants
are added above them in the list. Change them to explicit values
in separate blocks by class. I wrote a little program (using awk)
to dump the values of the constants:
https://gist.github.com/mwhudson/82f82008279a38ce584e
and confirmed that its output before and after this change is the
same.
Change-Id: Ib4aea4a0d688a16cdcb76af4715d1a97ec0f013c
Reviewed-on: https://go-review.googlesource.com/6581
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
- use Bvec, not *Bvec, and bulk allocate backing store
- use range loops
- put Bvecs in BasicBlock struct instead of indexing into parallel slices
Change-Id: I5cb30f50dccb4d38cc18fae422f7f132c52876be
Reviewed-on: https://go-review.googlesource.com/6602
Reviewed-by: Rob Pike <r@golang.org>
Also change gc.Naddr to return the Addr instead of filling it in.
Change-Id: I98a86705d23bee49626a12a042a4d51cabe290ea
Reviewed-on: https://go-review.googlesource.com/6601
Reviewed-by: Rob Pike <r@golang.org>
The C version of the compiler had just one hash table,
indexed by a (name string, pkg *Pkg) pair.
Because we always know the pkg during a lookup,
replace the one table with a per-Pkg map[string]*Sym.
This also lets us do non-allocating []byte key lookups.
This CL *does* change the generated object files.
In the old code, export data and init calls were emitted
in "hash table order". Now they are emitted in the order
in which they were added to the table.
Change-Id: I5a48d5c9add996dc43ad04a905641d901522de0b
Reviewed-on: https://go-review.googlesource.com/6600
Reviewed-by: Rob Pike <r@golang.org>
Strlit was just a poor excuse for a Go string.
Use a Go string.
In the one case where it was a string-or-nil (Type.Note), use a *string.
Zconv was a poor excuse for %q. Use %q.
The only important part about Zconv's implementation
was that the compiler and linker agreed on the quoting rules.
Now they both use %q instead of having two Zconvs.
This CL *does* change the generated object files, because the
quoted strings end up in symbol names.
For example the string "\r\n" used to be named go.string."\r\n"
and is now go.string."\x0d\n".
Change-Id: I5c0d38e1570ffc495f0db1a20273c9564104a7e8
Reviewed-on: https://go-review.googlesource.com/6519
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
This avoids the argument appearing to escape
(due to the fact that proginfo is always called
via a function pointer).
Change-Id: Ib9351ba18c80fd89e6a1d4f19dea386d4c657337
Reviewed-on: https://go-review.googlesource.com/6518
Reviewed-by: Rob Pike <r@golang.org>
Run rsc.io/grind rev 796d0f2 on C->Go conversions.
This replaces various awkward := initializations with plain var declarations.
Checked bit-for-bit compatibility with toolstash + buildall.
Change-Id: I601101d8177894adb9b0e3fb55dfe0ed4f544716
Reviewed-on: https://go-review.googlesource.com/6517
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Change-Id: If2d303caae933eec61634152e5d83faaba591315
Reviewed-on: https://go-review.googlesource.com/6660
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Mishandled the mask for the arm instructions.
TBR=rsc
Change-Id: Idc596097c0fa61dcacdfb4aca5bc6d0b4fd40eeb
Reviewed-on: https://go-review.googlesource.com/6641
Reviewed-by: Rob Pike <r@golang.org>
Error detection code copied from syscall, where presumably
we actually do it right.
Note that we throw the errno away. The runtime doesn't use it.
Fixes#10052
Change-Id: I8de77dda6bf287276b137646c26b84fa61554ec8
Reviewed-on: https://go-review.googlesource.com/6571
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
Aconv is the pretty-printer for instruction opcodes like AMOVQ.
There was one for each architecture.
Make the space of A names have a different region for each architecture,
much as we did for the registers, so a single global Aconv function can
do the work. Each architecture registers its region as a slice of names
at a given offset.
The global names like CALL and JMP are now defined only once.
The A values are used for indexing tables, so make it easy to do the
indexing by making the offset maskable.
Remove a bunch of now-duplicated architecture-specific code.
Change-Id: Ib15647b7145a1c089e21e36543691a19e146b60e
Reviewed-on: https://go-review.googlesource.com/6620
Reviewed-by: Russ Cox <rsc@golang.org>
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
grind's goto inliner moved a continue and changed its meaning. Oops.
Change-Id: Ifa2d3e1427036a606a069f356cd9b586ef22ec84
Reviewed-on: https://go-review.googlesource.com/6610
Reviewed-by: Russ Cox <rsc@golang.org>
Roll forward of 54efdc596f. Better testing of the build on
darwin/amd64. There is still some variance between cmd/dist
and the Go tool for build tag handling.
Change-Id: I105669ae7f90c8c89b3839c04b182cff46be8dde
Reviewed-on: https://go-review.googlesource.com/6516
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Previously, if there was a namespace defined on
a a>b tag, the namespace was ignored when
printing the parent elements. This fixes that,
and also fixes the racy behaviour of printerStack.trim
as discussed in https://go-review.googlesource.com/#/c/4152/10 .
Fixes#9796.
Change-Id: I75f97f67c08bbee151d1e0970f8462dd0f4511ef
Reviewed-on: https://go-review.googlesource.com/5910
Reviewed-by: Nigel Tao <nigeltao@golang.org>
No functional changes.
This diff was generated as follows:
* Manually edit cmd/internal/gc/go.go to update types and group variables.
* Manually edit initialization in cmd/internal/gc/align.go--localized s/1/true.
* Manually fix the handling of sign in cmd/internal/gc/walk.go in func bounded (near line 4000).
* Manually update go.y and regenerate y.go.
* Run gofmt -r many times to do the rest, using https://gist.github.com/josharian/0f61dbb2dff81f938e70.
toolstash -cmp on the stdlib comes back green.
Change-Id: I19766ed551714e51b325133e7138818d117b3a9a
Reviewed-on: https://go-review.googlesource.com/6530
Reviewed-by: Russ Cox <rsc@golang.org>
This CL makes the switch walking and typechecking code
more idiomatic and adds documentation.
It also removes all but one global variable.
No functional changes. Confirmed with toolstash -cmp on the stdlib.
Change-Id: Ic3f38acc66e906edd722498839aeb557863639cf
Reviewed-on: https://go-review.googlesource.com/6268
Reviewed-by: Russ Cox <rsc@golang.org>
This change fixes a missing case that a routing address contains an
invalid address family label but it holds a valid length of address
structure.
Also makes test robust.
Fixes#10041.
Change-Id: I2480ba273929e859896697382d1a75b01a116b98
Reviewed-on: https://go-review.googlesource.com/6391
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This reverts commit 54efdc596f.
Broken on darwin.
Change-Id: Ic74275f36d30975263340e2b4045226eae71b16a
Reviewed-on: https://go-review.googlesource.com/6514
Reviewed-by: David Crawshaw <crawshaw@golang.org>
A future change will include an NSTimeZone hook so we can determine
the device's current time zone.
Change-Id: Ia4bd6b955e4cb720c518055541b66ff57a4dd303
Reviewed-on: https://go-review.googlesource.com/6511
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
components.
This fixes decoding JPEG images where the component selector is 0. Such
images are rare, but not impossible.
Change-Id: I6d221bce01cce8cc0440e117543233371782ca22
Reviewed-on: https://go-review.googlesource.com/6421
Reviewed-by: Rob Pike <r@golang.org>
It is unused and should have been deleted when Rconv was made
a global function.
Change-Id: Id745dcee6f0769604cabde04887c6d0c94855405
Reviewed-on: https://go-review.googlesource.com/6521
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This is a followup to http://golang.org/cl/6280.
clang -pie fails to link misc/cgo/test on freebsd-amd64.
Change-Id: I6f9575d6bb579f4d38d70707fb9c92e303e30e6f
Reviewed-on: https://go-review.googlesource.com/6520
Run-TryBot: Minux Ma <minux@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>
PIE binaries can be built by the Go compiler in external link mode with
extldflags="-pie". These binaries support ASLR (address space layout
randomization) when executed on systems with appropriate kernel/dynamic
linker support.
This CL enables some cgo tests to run with -pie as a sanity check (in
addition to the other linker flag combinations they already test).
I have tested this functionality more thoroughly by building the full
compiler testsuite (test/...) and standard library tests with -pie
and executing them remotely on ChromeOS devices for all three linux
architectures (linux_amd64, linux_386, and linux_arm).
Change-Id: I3f644a72e94c3341f3360dfee58db5ec3a591e26
Reviewed-on: https://go-review.googlesource.com/6280
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Have the implementations of each architecture declare the one-operand,
destination-writing instructions instead of splitting the information between
there and asm.
Change-Id: I44899435011a4a7a398ed03c0801e9f81cc8c905
Reviewed-on: https://go-review.googlesource.com/6490
Reviewed-by: Russ Cox <rsc@golang.org>
Broke some tests that assume $GORACE is unset (because it never is).
Those tests are arguably wrong, but this is more robust.
Change-Id: Id56daa160c9e7e01f301c1386791e410bbd5deef
Reviewed-on: https://go-review.googlesource.com/6480
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This is a roll forward of 2adc3bd6ef. It occurred to me that we will
want this code on both darwin/arm and darwin/arm64. Removing _arm from
the file name conveniently avoids #10032.
Change-Id: I3a96a3e7020907d9307af8f696e26ad55b2060f0
Reviewed-on: https://go-review.googlesource.com/6460
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
Run rsc.io/grind rev a26569f on C->Go conversions.
The new change in grind is the inlining of goto targets.
If code says 'goto x' and the block starting at label x is unreachable
except through that goto and the code can be moved to where
the goto is without changing the meaning of its variable names,
grind does that move. Simlarly, a goto to a plain return statement
turns into that return statement (even if there are other paths to
the return statement).
Combined, these remove many long-distance gotos, which in turn
makes it possible to reduce the scope of more variable declarations.
(Because gotos can't jump across declarations, the gotos were
keeping the declarations from moving.)
Checked bit-for-bit compatibility with toolstash + buildall.
Reduces compiler runtime in html/template by about 12%.
Change-Id: Id727c0bd7763a61aa22f3daa00aeb8fccbc057a3
Reviewed-on: https://go-review.googlesource.com/6472
Reviewed-by: Aram Hăvărneanu <aram@mgk.ro>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
There's no point to having them in every GOOS_GOARCH directory,
since they are neither GOOS- nor GOARCH-specific.
(There used to be other headers that were.)
This makes building for additional toolchains easier:
no need to run make.bash at all.
Fixes#10049.
Change-Id: I710ecaafd7a5c8cad85ccd595ea9cb6058f553b3
Reviewed-on: https://go-review.googlesource.com/6471
Reviewed-by: Rob Pike <r@golang.org>
Replaced by Ctxt.ByteOrder, which uses the standard binary.ByteOrder type.
Change-Id: I06cec0674c153a9ad75ff937f7eb934891effd0b
Reviewed-on: https://go-review.googlesource.com/6450
Reviewed-by: Dave Cheney <dave@cheney.net>
Reviewed-by: Rob Pike <r@golang.org>
This avoids needing every invoked tool to have an identical
computation of the build defaults as the go command does.
It makes sure the tools all know what the go command wants.
Change-Id: I484f15982bfb93c86cde8fc9df7f456505270b87
Reviewed-on: https://go-review.googlesource.com/6409
Reviewed-by: Rob Pike <r@golang.org>
Before this CL, if you are on a darwin/amd64 machine and
cross-compile 9g for a linux/ppc64 machine, when you copy
9g over to that kind of machine and run it, you'll find it thinks
the default object target is darwin/amd64. Not useful.
Make the default target linux/ppc64 in this case. More useful.
Change-Id: I62f2e9cb5f60b3077a922b31cd023a9cb7a6cfda
Reviewed-on: https://go-review.googlesource.com/6407
Reviewed-by: Rob Pike <r@golang.org>
OpenBSD's sigprocmask system call passes the signal mask by value
rather than reference, so vars are unnecessary. Additionally,
declaring "var sigset_all = ^sigset_none" means sigset_all won't be
initialized until runtime_init is called, but the first call to
newosproc happens before then.
I've witnessed Go processes on OpenBSD crash from receiving SIGWINCH
on the newly created OS thread before it finished initializing.
Change-Id: I16995e7e466d5e7e50bcaa7d9490173789a0b4cc
Reviewed-on: https://go-review.googlesource.com/6440
Reviewed-by: Mikio Hara <mikioh.mikioh@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Move type definitions from chan1.go to chan.go and select.go.
Remove underscores from names.
Make c.buf unsafe.Pointer instead of *uint8.
Change-Id: I75cf8385bdb9f79eb5a7f7ad319495abbacbe942
Reviewed-on: https://go-review.googlesource.com/4900
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Dmitry Vyukov <dvyukov@google.com>
Currently the test fails if run more than once:
$ go test -v -run=TestChildServeCleansUp -cpu=1,1 net/http/fcgi
=== RUN TestChildServeCleansUp
--- PASS: TestChildServeCleansUp (0.00s)
=== RUN TestChildServeCleansUp
fatal error: all goroutines are asleep - deadlock!
The problem is that the writer mutates test input data,
so it is wrong on the second execution.
Change-Id: I4ca54dd2926c6986b2908023ac65e5e65630ed26
Reviewed-on: https://go-review.googlesource.com/6383
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This fixes runtime's TestBreakpoint on ppc64:
the Breakpoint frame was not showing up in the trace.
It seems like f.frame should be either the frame size
including the saved LR (if any) or the frame size
not including the saved LR.
On ppc64, f.frame is the frame size not including the saved LR.
On arm, f.frame is the frame size not including the saved LR,
except when that's -4, f.frame is 0 instead.
The code here in the runtime expects that f.frame is the frame
size including the saved LR.
Since all three disagree and nothing else uses f.frame anymore,
stop using it here too. Use funcspdelta, which tells us the exact
difference between the FP and SP. If it's zero, LR has not been
saved yet, so the one saved for sigpanic should be recorded.
This fixes TestBreakpoint on both ppc64 and ppc64le.
I don't really understand how it ever worked there.
Change-Id: I2d2c580d5c0252cc8471e828980aeedcab76858d
Reviewed-on: https://go-review.googlesource.com/6430
Reviewed-by: Minux Ma <minux@golang.org>
Looks like c2go and gcc disagree about the exact meaning of the
usual arithmetic conversions, in a way that broke 9l's archreloc.
Fix it.
It's very hard for me to see why the original C code did not say
what c2go interpreted it to say, but apparently it did not.
This is why Go has explicit numerical conversions.
Change-Id: I75bd73afd1fa4ce9a53c887e1bd7d1e26ff43ae4
Reviewed-on: https://go-review.googlesource.com/6405
Reviewed-by: Russ Cox <rsc@golang.org>
This CL will break any uses of 'go tool 5a' etc.
That is intentional.
Code that invokes an assembler directly should be updated to use go tool asm.
We plan to keep the old5a around for bit-for-bit verification during
the release testing phase, but we plan to remove those tools for the
actual release. Renaming the directory now makes sure that lingering
references to 'go tool 5a' will be caught, changed to use asm, and
tested during the release evaluation.
Change-Id: I98748a7ddb34cc7f1b151c2ef421d3656821f5c2
Reviewed-on: https://go-review.googlesource.com/6366
Reviewed-by: Rob Pike <r@golang.org>
Tests sometimes failed with:
ok mime/internal/quotedprintable 0.606s
ok mime/multipart 0.819s
--- FAIL: TestPacketConn (0.10s)
packetconn_test.go:96: PacketConn.ReadFrom failed: WSARecvFrom udp 127.0.0.1:64156: i/o timeout
FAIL
FAIL net 3.602s
ok net/http 4.618s
ok net/http/cgi 0.576s
Theory: 100 ms is too short. Small timer granularity on Wnidows, or an
allocation in the middle causing a GC sometimes?
In any case, increase it to 500 ms.
Change-Id: I48cc4d600eb168db9f85c0fd05335dd630254c3c
Reviewed-on: https://go-review.googlesource.com/4922
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Plan 9 provides a /dev/random device to return a
stream of random numbers. However, the method used
to generate random numbers on Plan 9 is slow and
reading from /dev/random may block.
We don't want our Go programs to be significantly
slowed down just to slightly improve the distribution
of hash values.
So, we do the same thing as NaCl and rely exclusively
on extendRandom to generate pseudo-random numbers.
Fixes#10028.
Change-Id: I7e11a9b109c22f23608eb09c406b7c3dba31f26a
Reviewed-on: https://go-review.googlesource.com/6386
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
In CL 6350, Brad fixed the following system calls
to use the program-wide workding directory:
- bind
- chdir
- create
- open
- remove
- stat
- umount
- wstat
However, Russ Cox pointed out that the mount
system call should be fixed as well.
Change-Id: I6139ed11ba449f18c46e95269f4d0e51be7cec48
Reviewed-on: https://go-review.googlesource.com/6385
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
If a method called by fmt triggers a panic, the output usually says
so. However, there is heretofore undocumented special treatment for
a panic caused by formatting a nil value with an Error or String
method: the output is simply "<nil>". Document that behavior.
Change-Id: Id0f79dd0b3487f9d1c74a0856727bba5cc342be4
Reviewed-on: https://go-review.googlesource.com/6410
Reviewed-by: David Crawshaw <crawshaw@golang.org>
The go_darwin_arm_exec script now tells lldb to move the working
directory into <bundle>/src/os on startup.
Change-Id: I0ada4969e9ea374f08c84ab736aab2097ac73dd8
Reviewed-on: https://go-review.googlesource.com/6369
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
issue #10017: TestGdbPython 'print mapvar' is reported to fail on ppc64.
issue #10002: TestGdbPython 'print mapvar' is reported to fail on arm hardfloat.
The testcase now uses plain line number in main. Unwinding issues are
unrelated to the GDB map prettyprinter feature.
Remove arch-specific t.Skip()s from those two issues.
Fixes#10017Fixes#10002
Change-Id: I9d50ffe2f3eb7bf65dd17c8c76a2677571de68ba
Reviewed-on: https://go-review.googlesource.com/6267
Reviewed-by: Minux Ma <minux@golang.org>
These files were left behind for the C implementation of the assemblers.
They're no longer needed.
This is the last of the cmd/cc directory.
Change-Id: I9231b23c27fead5695000097aeb694824747677d
Reviewed-on: https://go-review.googlesource.com/6367
Reviewed-by: Minux Ma <minux@golang.org>
mv cmd/new5l cmd/5l and so on.
Minimal changes to cmd/dist and cmd/go to keep things building.
More can be deleted in followup CLs.
Change-Id: I1449eca7654ce2580d1f413a56dc4a75f3d4618b
Reviewed-on: https://go-review.googlesource.com/6361
Reviewed-by: Rob Pike <r@golang.org>
Today it's only recorded for C, but the Go version of the linker will need it.
Change-Id: I0de56d98e8f3f1b7feb830458c0934af367fd29a
Reviewed-on: https://go-review.googlesource.com/6333
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>
In the tests, the runtime test fails after 2 minutes.
On an unloaded VM it only takes 45 seconds.
I think the difference is all the other build work going on
simultaneously with the running of the runtime test.
Change-Id: I41e95d2e4daea44ceaa8505f81aa7b5bcfa9ec77
Reviewed-on: https://go-review.googlesource.com/6364
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
We used to not call traceback from goexit1.
But now tracer does it and crashes on amd64p32:
runtime: unexpected return pc for runtime.getg called from 0x108a4240
goroutine 18 [runnable, locked to thread]:
runtime.traceGoEnd()
src/runtime/trace.go:758 fp=0x10818fe0 sp=0x10818fdc
runtime.goexit1()
src/runtime/proc1.go:1540 +0x20 fp=0x10818fe8 sp=0x10818fe0
runtime.getg(0x0)
src/runtime/asm_386.s:2414 fp=0x10818fec sp=0x10818fe8
created by runtime/pprof_test.TestTraceStress
src/runtime/pprof/trace_test.go:123 +0x500
Return PC from goexit1 points right after goexit (+0x6).
It happens to work most of the time somehow.
This change fixes traceback from goexit1 by adding an additional NOP to goexit.
Fixes#9931
Change-Id: Ied25240a181b0a2d7bc98127b3ed9068e9a1a13e
Reviewed-on: https://go-review.googlesource.com/5460
Reviewed-by: Russ Cox <rsc@golang.org>
This is to be used by an lldb script inside go_darwin_arm_exec to pause
the execution of tests on iOS so the working directory can be adjusted
into something resembling a GOROOT.
Change-Id: I69ea2d4d871800ae56634b23ffa48583559ddbc6
Reviewed-on: https://go-review.googlesource.com/6363
Reviewed-by: Minux Ma <minux@golang.org>
Grayscale PNG and JPEG images are not uncommon. We should have a fast path.
Also add a benchmark for the recently added CMYK fast path.
benchmark old ns/op new ns/op delta
BenchmarkGray 13960348 324152 -97.68%
Change-Id: I72b5838c8c3d1f2d0a4536a848e020e80b10c0f7
Reviewed-on: https://go-review.googlesource.com/6237
Reviewed-by: Rob Pike <r@golang.org>
This is a follow-up to CL 6265. No behavior changes.
The diff was generated with eg, using template:
package p
import "fmt"
func before(a string) string { return fmt.Sprintf(a) }
func after(a string) string { return a }
Change-Id: I7b3bebf31be5cd1ae2233da06cb4502a3d73f092
Reviewed-on: https://go-review.googlesource.com/6269
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Having this test fail, as it does reliably for me,
makes working frustrating. Disable it for now,
until we can diagnose the issue.
Update issue #8859.
Change-Id: I9dda30d60793e7a51f48f445c78ccb158068cc25
Reviewed-on: https://go-review.googlesource.com/6381
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
ARM operands for MOVM have lists of registers: [R1,R2,R5-R8].
Handle them cleanly.
It was TYPE_CONST with special handling, which meant operand printing
didn't work right and the special handling was ugly. Add a new TYPE_REGLIST
for this case and it all gets cleaner.
Change-Id: I4a64f70fb9765e63cb636619a7a8553611bfe970
Reviewed-on: https://go-review.googlesource.com/6300
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
On Plan 9, the pwd is apparently per-thread not per process. That
means different goroutines saw different current directories, even
changing within a goroutine as they were scheduled.
Instead, track the the process-wide pwd protected by a mutex in the
syscall package and set the current goroutine thread's pwd to the
correct once at critical points.
Fixes#9428
Change-Id: I928e90886355be4a95c2be834f5883e2b50fc0cf
Reviewed-on: https://go-review.googlesource.com/6350
Reviewed-by: David du Colombier <0intro@gmail.com>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This reverts commit 87a0d395c3.
Looks like introducing file_darwin_arm.go is confusing something in the API checker (probably go/types) into ignoring file.go, so the O_SYNC symbol is being lost.
No actual bug in this CL AFAIK, but I'll fix the other bug later and then roll this forward.
Change-Id: Ic132fb101e4b5f2716f7a0d15872bf35bdf42139
Reviewed-on: https://go-review.googlesource.com/6331
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Tests that fork are skipped. Tests that create files do so in a
temporary directory, as the initial PWD is read-only. And
darwin/arm returns a strange mkdir error when trying to write to /.
Change-Id: I2de661a85524300bbac226693d72142992dc188d
Reviewed-on: https://go-review.googlesource.com/6312
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
An artifact of the c2go translation was
a handful of instances of code like:
var s string
s += "foo"
return s
This CL converts those to simply 'return "foo"'.
The conversion was done mechanically with the
quick-and-dirty cleanup script at
https://gist.github.com/josharian/1fa4408044c163983e62.
I then manually moved a couple of comments in fmt.go.
toolstash -cmp thinks that there are no functional changes.
Change-Id: Ic0ebdd10f0fb8de0360a1041ce5cd10ae1168be9
Reviewed-on: https://go-review.googlesource.com/6265
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Not only carrying invalid info but also this caused Error to crash with
null pointer exception.
Change-Id: Ibfe63d20eb9b9178ea618e59c74111e9245a6779
Reviewed-on: https://go-review.googlesource.com/6270
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
These 8 registers are windows into the CR register. They are officially CR0
through CR7 and that is what the assembler accepts, but for some reason
they have always printed as C0 through C7. Fix the naming and printing.
Change-Id: I55822c0322c29d3e01a1f2776b3b210ebf9ded21
Reviewed-on: https://go-review.googlesource.com/6290
Reviewed-by: Russ Cox <rsc@golang.org>
When a function had no body, Yyerror was called with an extra
argument, leading to extraneous printouts.
Add the missing verb to the Yyerror call and display the name of the
bodiless function.
Fixes#10030
Change-Id: I76d76c4547fb9cad1782cb11f7a5c63065a6e0c5
Reviewed-on: https://go-review.googlesource.com/6263
Reviewed-by: Rob Pike <r@golang.org>
Change-Id: I9b08b74214e5a41a7e98866a993b038030a4c073
Reviewed-on: https://go-review.googlesource.com/6251
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Previously, the typeDead check in greyobject was under a separate
!useCheckmark conditional. Put it with the rest of the !useCheckmark
code. Also move a comment about atomic update of the marked bit to
where we actually do that update now.
Change-Id: Ief5f16401a25739ad57d959607b8d81ffe0bc211
Reviewed-on: https://go-review.googlesource.com/6271
Reviewed-by: Rick Hudson <rlh@golang.org>
Change-Id: I8b18dc840425b72d7172a35cb0ba004bd156492d
Reviewed-on: https://go-review.googlesource.com/6252
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Change-Id: I1d1eb71014381452d1ef368431cb2556245a35ab
Reviewed-on: https://go-review.googlesource.com/6250
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
The timeouts were increased in CL 2462 and CL 2510
to work around a slowness issue when running Go
programs on a Plan 9 machine on GCE.
Since we figured out this issue, we can restore
the timeouts to their original values.
Updates #10028.
Change-Id: I2e5b91666461715df69df97ea791f3d88d9de4d0
Reviewed-on: https://go-review.googlesource.com/6261
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Clean up the obj API by making Rconv (register pretty printer) a top-level
function. This means that Dconv (operand pretty printer) doesn't need
an Rconv argument.
To do this, we make the register numbers, which are arbitrary inside an
operand (obj.Addr), disjoint sets for each architecture. Each architecture
registers (ha) a piece of the space and then the global Rconv knows which
architecture-specific printer to use.
Clean up all the code that uses Dconv.
Now register numbers are large, so a couple of fields in Addr need to go
from int8 to int16 because they sometimes hold register numbers. Clean
up their uses, which meant regenerating the yacc grammars for the
assemblers. There are changes in this CL triggered by earlier changes
to yacc, which had not been run in this directory.
There is still cleanup to do in Addr, but we're getting closer to that being
easy to do.
Change-Id: I9290ebee013b62f7d24e886743ea5a6b232990ab
Reviewed-on: https://go-review.googlesource.com/6220
Reviewed-by: Russ Cox <rsc@golang.org>
Change-Id: I1bb0b8b11e8c7686b85657050fd7cf926afe4d29
Reviewed-on: https://go-review.googlesource.com/6200
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Updates #9974
This proposal tackles the body of syscalls which have been replaced,
and are now deprecated in linux. This is needed for the arm64 port as
arm64 is the first linux architecture to remove the "legacy" forms of
these syscalls.
The *AT variants were added in kernel 2.6.16, so well before our 2.6.23
cutoff (hey, it'll even work on RHEL5).
Discussion: https://groups.google.com/forum/#!topic/golang-dev/zpeFtN2z5Fc
Change-Id: I473a7c9a295d6f776fcdc75dcce06cbe9e3564ee
Reviewed-on: https://go-review.googlesource.com/5837
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Change-Id: I44f1240a766f20de5997faca4f13f96af6da3534
Reviewed-on: https://go-review.googlesource.com/6190
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Change-Id: I2fc3cf94b465bf9d7ff8d7bf935b45e334b401e3
Reviewed-on: https://go-review.googlesource.com/6180
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
It was just missing, and apparently always was.
Change-Id: I84c057bb0ec72940201075f3e6078262fe4bce05
Reviewed-on: https://go-review.googlesource.com/6120
Reviewed-by: Russ Cox <rsc@golang.org>
Previously, the memory allocator on Plan 9 did
not free memory properly. It was only able to
free the last allocated block.
This change implements a variant of the
Kernighan & Ritchie memory allocator with
coalescing and splitting.
The most notable differences are:
- no header is prefixing the allocated blocks, since
the size is always specified when calling sysFree,
- the free list is nil-terminated instead of circular.
Fixes#9736.
Fixes#9803.
Fixes#9952.
Change-Id: I00d533714e4144a0012f69820d31cbb0253031a3
Reviewed-on: https://go-review.googlesource.com/5524
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Disable the test properly on nacl systems, tested on nacl/amd64p32.
Change-Id: Iffe210be4f9c426bfc47f2dd3a8f0c6b5a398cc3
Reviewed-on: https://go-review.googlesource.com/6093
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Update #9993
If the physical page size of the machine is larger than the logical
heap size, for example 8k logical, 64k physical, then madvise(2) will
round up the requested amount to a 64k boundary and may discard pages
close to the page being madvised.
This patch disables the scavenger in these situations, which at the moment
is only ppc64 and ppc64le systems. NaCl also uses a 64k page size, but
it's not clear if it is affected by this problem.
Change-Id: Ib897f8d3df5bd915ddc0b510f2fd90a30ef329ca
Reviewed-on: https://go-review.googlesource.com/6091
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
This commit creates the mime/quotedprintable package. It moves and
exports the QP reader of mime/internal/quotedprintable.
The code is almost unchanged to preserve the commit history.
Updates #4943
Change-Id: I4b7b5a2a40a4c84346d42e4cdd2c11a91b28f9e3
Reviewed-on: https://go-review.googlesource.com/5940
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Liblink is still needed for the linker (for a bit longer) but mostly not.
Delete the unused parts.
Change-Id: Ie63a7c1520dee52b17425b384943cd16262d36e3
Reviewed-on: https://go-review.googlesource.com/6110
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Inlining refuses to inline bodies containing an actual function call, so that
if that call or a child uses runtime.Caller it cannot observe
the inlining.
However, inlining was also refusing to inline bodies that contained
function calls that were themselves inlined away. For example:
func f() int {
return f1()
}
func f1() int {
return f2()
}
func f2() int {
return 2
}
The f2 call in f1 would be inlined, but the f1 call in f would not,
because f1's call to f2 blocked the inlining, despite itself eventually
being inlined away.
Account properly for this kind of transitive inlining and enable.
Also bump the inlining budget a bit, so that the runtime's
heapBits.next is inlined.
This reduces the time for '6g *.go' in html/template by around 12% (!).
(For what it's worth, closing Chrome reduces the time by about 17%.)
Change-Id: If1aa673bf3e583082dcfb5f223e67355c984bfc1
Reviewed-on: https://go-review.googlesource.com/5952
Reviewed-by: Austin Clements <austin@google.com>
MinPrec returns the minimum precision required to represent a Float
without loss of precision. Added test.
Change-Id: I466c8e492dcdd59fae854fc4e71ef9b1add7d817
Reviewed-on: https://go-review.googlesource.com/6010
Reviewed-by: Alan Donovan <adonovan@google.com>
There is only one process under the iOS sandboxd.
Change-Id: I21b5528366a0248a034801a717f24c60f0733c5f
Reviewed-on: https://go-review.googlesource.com/6101
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Needs the Go tool, which we do not have on iOS. (No Fork.)
Change-Id: Iedf69f5ca81d66515647746546c9b304c8ec10c4
Reviewed-on: https://go-review.googlesource.com/6102
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Section 4.3.14.1 of the ZIP file format
spec (https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT) says,
The value stored into the "size of zip64 end of central directory
record" should be the size of the remaining record and should not
include the leading 12 bytes.
We were previously writing the full size, including the 12 bytes.
Fixes#9857
Change-Id: I7cf1fc8457c5f306717cbcf61e02304ab549781f
Reviewed-on: https://go-review.googlesource.com/4760
Reviewed-by: Andrew Gerrand <adg@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Change-Id: Ief78a10c4aaa43f300f34519911ff73b6f510d73
Reviewed-on: https://go-review.googlesource.com/6100
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
There is no sense in trying to netpoll while there is
already a thread blocked in netpoll. And in most cases
there must be a thread blocked in netpoll, because
the first otherwise idle thread does blocking netpoll.
On some program I see that netpoll called from findrunnable
consumes 3% of time.
Change-Id: I0af1a73d637bffd9770ea50cb9278839716e8816
Reviewed-on: https://go-review.googlesource.com/4553
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Dmitry Vyukov <dvyukov@google.com>
This makes Go's CPU profiling code somewhat more idiomatic; e.g.,
using := instead of forward declaring variables, using "int" for
element counts instead of "uintptr", and slices instead of C-style
pointer+length. This makes the code easier to read and eliminates a
lot of type conversion clutter.
Additionally, in sigprof we can collect just maxCPUProfStack stack
frames, as cpuprof won't use more than that anyway.
Change-Id: I0235b5ae552191bcbb453b14add6d8c01381bd06
Reviewed-on: https://go-review.googlesource.com/6072
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
This reduces the number of allocs when
running the rotate.go tests by
about 20%, after applying CL 5700.
Combining
s = "const str"
s += <another string>
generally saves an alloc and might be a candidate for
rsc's grind tool. However, I'm sending this CL now
because this also reuses the result of calling lexbuf.String.
Change-Id: If3a7300b7da9612ab62bb910ee90349dca88dde3
Reviewed-on: https://go-review.googlesource.com/5821
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The first call is pointless. It appears to simply be a mistake.
benchmark old ns/op new ns/op delta
BenchmarkComplexAlgMap 90.7 76.1 -16.10%
Change-Id: Id0194c9f09cea8b68f17b2ac751a8e3240e47f19
Reviewed-on: https://go-review.googlesource.com/5284
Reviewed-by: Keith Randall <khr@golang.org>
The existing Hostname function uses the GetComputerName system
function in windows to determine the hostname. It has some downsides:
- The name is limited to 15 characters.
- The name returned is for NetBIOS, other OS's return a DNS name
This change adds to the internal/syscall/windows package a
GetComputerNameEx function, and related enum constants. They are used
instead of the syscall.ComputerName function to implement os.Hostname
on windows.
Fixes#9982
Change-Id: Idc8782785eb1eea37e64022bd201699ce9c4b39c
Reviewed-on: https://go-review.googlesource.com/5852
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Carlos Castillo <cookieo9@gmail.com>
Reviewed-by: Yasuhiro MATSUMOTO <mattn.jp@gmail.com>
Gives tests a way to find the bundle that contains their testdata, and
is generally useful for finding resources.
Change-Id: Idfa03e8543af927c17bc8ec8aadc5014ec82df28
Reviewed-on: https://go-review.googlesource.com/6000
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Updates #10002
The gdb test added in 1c82e236f5 is failing on most arm systems.
Temporarily disable this test so that we can return to a working arm build.
Change-Id: Iff96ea8d5a99e1ceacf4979e864ff196e5503535
Reviewed-on: https://go-review.googlesource.com/5902
Reviewed-by: Ian Lance Taylor <iant@golang.org>
We return memory to the kernel with madvise(..., DONTNEED).
Also mark returned memory with NOHUGEPAGE to keep the kernel from
merging this memory into a huge page, effectively reallocating it.
Only known to be a problem on linux/{386,amd64,amd64p32} at the moment.
It may come up on other os/arch combinations in the future.
Fixes#8832
Change-Id: Ifffc6627a0296926e3f189a8a9b6e4bdb54c79eb
Reviewed-on: https://go-review.googlesource.com/5660
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
