The cached computed interface tables are indexed by the interface
types, not by the unnamed underlying interfaces
To preserve the invariants expected by interface comparison, an
itab generated for an interface type must not be used for a value
of a different interface type even if the representation is identical.
Fixes#7207.
LGTM=rsc
R=rsc, iant, khr
CC=golang-codereviews
https://golang.org/cl/69210044
MCaches now hold a MSpan for each sizeclass which they have
exclusive access to allocate from, so no lock is needed.
Modifying the heap bitmaps also no longer requires a cas.
runtime.free gets more expensive. But we don't use it
much any more.
It's not much faster on 1 processor, but it's a lot
faster on multiple processors.
benchmark old ns/op new ns/op delta
BenchmarkSetTypeNoPtr1 24 23 -0.42%
BenchmarkSetTypeNoPtr2 33 34 +0.89%
BenchmarkSetTypePtr1 51 49 -3.72%
BenchmarkSetTypePtr2 55 54 -1.98%
benchmark old ns/op new ns/op delta
BenchmarkAllocation 52739 50770 -3.73%
BenchmarkAllocation-2 33957 34141 +0.54%
BenchmarkAllocation-3 33326 29015 -12.94%
BenchmarkAllocation-4 38105 25795 -32.31%
BenchmarkAllocation-5 68055 24409 -64.13%
BenchmarkAllocation-6 71544 23488 -67.17%
BenchmarkAllocation-7 68374 23041 -66.30%
BenchmarkAllocation-8 70117 20758 -70.40%
LGTM=rsc, dvyukov
R=dvyukov, bradfitz, khr, rsc
CC=golang-codereviews
https://golang.org/cl/46810043
Functions that "fit" on one line and were on one
line in the original source are not broken up into
two lines anymore simply because they contain a comment.
- Fine-tuned use of separating blanks after /*-style comments, so:
( /* extra blank after this comment */ )
(a int /* no extra blank after this comment*/)
- Factored out comment state (from printer state) into commentInfo.
- No impact on $GOROOT/src, misc formatting.
Fixes#5543.
LGTM=r
R=golang-codereviews, r
CC=golang-codereviews
https://golang.org/cl/68630043
From the original description in CL 15770043
The main change here is to consult $GOARCH.
In 6c, when GOOS=nacl, some of the more complex addressing modes must be disabled, and the BP and R15 registers must not be used.
See golang.org/s/go13nacl for design overview.
LGTM=rsc
R=golang-codereviews, gobot, rsc
CC=golang-codereviews
https://golang.org/cl/69020044
This partly addresses issue 6099 where a gofmt rewrite is behaving
unexpectedly because the provided rewrite term is not a valid expression
but is silently consumed anyway.
LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/68920044
These are mistakes in the first big NaCl CL.
LGTM=minux.ma, iant
R=golang-codereviews, minux.ma, iant
CC=golang-codereviews
https://golang.org/cl/69200043
The gvardef function does nothing if n->class == PEXTERN, so
we don't need to test for that before calling it. This makes
the 6g/8g code more like the 5g code and clarifies that the
cases that do not test for n->class != PEXTERN are not buggy.
LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/68900044
Switch nanotime to a monotonic clock on openbsd/386 and openbsd/amd64.
Also use a monotonic clock when for thrsleep, since the sleep duration
is based on the value returned from nanotime.
Update #6007
LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/68460044
For now we don't use CLOCK_MONOTONIC_FAST instead because
it's not supported on prior to 9-STABLE.
Update #6007
LGTM=minux.ma
R=golang-codereviews, minux.ma, bradfitz
CC=golang-codereviews
https://golang.org/cl/68690043
maxstksize is superfluous and appears to be vestigial. 6g does not use it.
c >= 4 cannot occur; c = w % 4.
LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/68750043
These previously reviewed CLs are present in this CL.
---
changeset: 18445:436bb084caed
user: Russ Cox <rsc@golang.org>
date: Mon Nov 11 09:50:34 2013 -0500
description:
runtime: assembly and system calls for Native Client x86-64
See golang.org/s/go13nacl for design overview.
This CL is publicly visible but not CC'ed to golang-dev,
to avoid distracting from the preparation of the Go 1.2
release.
This CL and the others will be checked into my rsc-go13nacl
clone repo for now, and I will send CLs against the main
repo early in the Go 1.3 development.
R≡adg
https://golang.org/cl/15760044
---
changeset: 18448:90bd871b5994
user: Russ Cox <rsc@golang.org>
date: Mon Nov 11 09:51:36 2013 -0500
description:
runtime: amd64p32 and Native Client assembly bootstrap
See golang.org/s/go13nacl for design overview.
This CL is publicly visible but not CC'ed to golang-dev,
to avoid distracting from the preparation of the Go 1.2
release.
This CL and the others will be checked into my rsc-go13nacl
clone repo for now, and I will send CLs against the main
repo early in the Go 1.3 development.
R≡khr
https://golang.org/cl/15820043
---
changeset: 18449:b011c3dc687e
user: Russ Cox <rsc@golang.org>
date: Mon Nov 11 09:51:58 2013 -0500
description:
math: amd64p32 assembly routines
These routines only manipulate float64 values,
so the amd64 and amd64p32 can share assembly.
The large number of files is symptomatic of a problem
with package path: it is a Go package structured like a C library.
But that will need to wait for another day.
See golang.org/s/go13nacl for design overview.
This CL is publicly visible but not CC'ed to golang-dev,
to avoid distracting from the preparation of the Go 1.2
release.
This CL and the others will be checked into my rsc-go13nacl
clone repo for now, and I will send CLs against the main
repo early in the Go 1.3 development.
R≡bradfitz
https://golang.org/cl/15870043
---
changeset: 18450:43234f082eec
user: Russ Cox <rsc@golang.org>
date: Mon Nov 11 10:03:19 2013 -0500
description:
syscall: networking for Native Client
See golang.org/s/go13nacl for design overview.
This CL is publicly visible but not CC'ed to golang-dev,
to avoid distracting from the preparation of the Go 1.2
release.
This CL and the others will be checked into my rsc-go13nacl
clone repo for now, and I will send CLs against the main
repo early in the Go 1.3 development.
R≡rsc
https://golang.org/cl/15780043
---
changeset: 18451:9c8d1d890aaa
user: Russ Cox <rsc@golang.org>
date: Mon Nov 11 10:03:34 2013 -0500
description:
runtime: assembly and system calls for Native Client x86-32
See golang.org/s/go13nacl for design overview.
This CL is publicly visible but not CC'ed to golang-dev,
to avoid distracting from the preparation of the Go 1.2
release.
This CL and the others will be checked into my rsc-go13nacl
clone repo for now, and I will send CLs against the main
repo early in the Go 1.3 development.
R≡rsc
https://golang.org/cl/15800043
---
changeset: 18452:f90b1dd9228f
user: Russ Cox <rsc@golang.org>
date: Mon Nov 11 11:04:09 2013 -0500
description:
runtime: fix frame size for linux/amd64 runtime.raise
R≡rsc
https://golang.org/cl/24480043
---
changeset: 18445:436bb084caed
user: Russ Cox <rsc@golang.org>
date: Mon Nov 11 09:50:34 2013 -0500
description:
runtime: assembly and system calls for Native Client x86-64
See golang.org/s/go13nacl for design overview.
This CL is publicly visible but not CC'ed to golang-dev,
to avoid distracting from the preparation of the Go 1.2
release.
This CL and the others will be checked into my rsc-go13nacl
clone repo for now, and I will send CLs against the main
repo early in the Go 1.3 development.
R≡adg
https://golang.org/cl/15760044
---
changeset: 18455:53b06799a938
user: Russ Cox <rsc@golang.org>
date: Mon Nov 11 23:29:52 2013 -0500
description:
cmd/gc: add -nolocalimports flag
R≡dsymonds
https://golang.org/cl/24990043
---
changeset: 18456:24f64e1eaa8a
user: Russ Cox <rsc@golang.org>
date: Tue Nov 12 22:06:29 2013 -0500
description:
runtime: add comments for playback write
R≡adg
https://golang.org/cl/25190043
---
changeset: 18457:d1f615bbb6e4
user: Russ Cox <rsc@golang.org>
date: Wed Nov 13 17:03:52 2013 -0500
description:
runtime: write only to NaCl stdout, never to NaCl stderr
NaCl writes some other messages on standard error
that we would like to be able to squelch.
R≡adg
https://golang.org/cl/26240044
---
changeset: 18458:1f01be1a1dc2
tag: tip
user: Russ Cox <rsc@golang.org>
date: Wed Nov 13 19:45:16 2013 -0500
description:
runtime: remove apparent debugging dreg
Setting timens to 0 turns off fake time.
TBR≡adg
https://golang.org/cl/26400043
LGTM=bradfitz
R=dave, bradfitz
CC=golang-codereviews
https://golang.org/cl/68730043
Solaris does not define syscall.{Mmap,Munmap}. Move the Mmap test to a new file and exclude solaris as discussed.
LGTM=aram
R=aram, mikioh.mikioh, iant
CC=golang-codereviews
https://golang.org/cl/68720043
The parser was assuming it would find <body> or </head>.
If the entire response is just <meta> tags, it finds EOF and
treats that as an error. It's not.
LGTM=bradfitz
R=bradfitz
CC=golang-codereviews
https://golang.org/cl/68520044
The new flag was added by CL 68150047 (part of the NaCl replay),
but the change, like the original, omitted documentation of the
new behavior.
LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/68580043
See golang.org/s/go13nacl for design overview.
This CL is the mostly mechanical changes from rsc's Go 1.2 based NaCl branch, specifically 39cb35750369 to 500771b477cf from https://code.google.com/r/rsc-go13nacl. This CL does not include working NaCl support, there are probably two or three more large merges to come.
CL 15750044 is not included as it involves more invasive changes to the linker which will need to be merged separately.
The exact change lists included are
15050047: syscall: support for Native Client
15360044: syscall: unzip implementation for Native Client
15370044: syscall: Native Client SRPC implementation
15400047: cmd/dist, cmd/go, go/build, test: support for Native Client
15410048: runtime: support for Native Client
15410049: syscall: file descriptor table for Native Client
15410050: syscall: in-memory file system for Native Client
15440048: all: update +build lines for Native Client port
15540045: cmd/6g, cmd/8g, cmd/gc: support for Native Client
15570045: os: support for Native Client
15680044: crypto/..., hash/crc32, reflect, sync/atomic: support for amd64p32
15690044: net: support for Native Client
15690048: runtime: support for fake time like on Go Playground
15690051: build: disable various tests on Native Client
LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/68150047
This CL adds a test that calls Mmap and Munmap through Syscall9
as the canary that detects assembly fragment breakage. For now
there is no package test that uses Syscall9 in the standard
library across all Unix-like systems.
Note that the package runtime owns its assembly fragments, so
this canary never works for runtime breakage.
LGTM=iant, bradfitz
R=iant, minux.ma, bradfitz
CC=golang-codereviews
https://golang.org/cl/61520049
These are only the new files, autogenerated files are in a
different CL to keep the size down.
LGTM=dave, minux.ma, jsing
R=golang-codereviews, dave, jsing, gobot, minux.ma, rsc, iant, mikioh.mikioh
CC=golang-codereviews
https://golang.org/cl/36000043
Update #3362
Also set a 30 second timeout, instead of relying on the
operating system's timeout, which if often but not always 3
minutes.
LGTM=crawshaw
R=rsc, crawshaw
CC=golang-codereviews
https://golang.org/cl/68330046
Currently an ECDHE handshake uses the client's curve preference. This
generally means that we use P-521. However, P-521's strength is
mismatched with the rest of the cipher suite in most cases and we have
a fast, constant-time implementation of P-256.
With this change, Go servers will use P-256 where the client supports
it although that can be overridden in the Config.
LGTM=bradfitz
R=bradfitz
CC=golang-codereviews
https://golang.org/cl/66060043
Record what's going on in case someone is debugging a failure there.
It's not Go's fault.
Fixes#7381.
LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/68200043
Revision c0e0467635ec (cmd/gc: return canonical Node* from temp)
exposed original nodes of temporaries, allowing callers to mutate
their types.
In walkcompare a temporary could be typed as ideal because of
this. Additionnally, assignment of a comparison result to
a custom boolean type was broken.
Fixes#7366.
LGTM=rsc
R=rsc, iant, khr
CC=golang-codereviews
https://golang.org/cl/66930044
Fixes the output of go env so that variables can be set
more accurately when using Plan 9's rc shell. Specifically,
GOPATH may have multiple components and the current
representation is plain wrong. In practice, we probably
ought to change os. Getenv to produce the right result, but
that requires considerably more thought.
LGTM=rsc
R=golang-codereviews, gobot, rsc
CC=golang-codereviews
https://golang.org/cl/66600043
Fatal must not be called from secondary goroutines.
Fixes#7401.
LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/67820047
Reinforce the guarantee that MSpan_EnsureSwept actually ensures that the span is swept.
I have not observed crashes related to this, but I do not see why it can't crash as well.
LGTM=rsc
R=golang-codereviews
CC=golang-codereviews, khr, rsc
https://golang.org/cl/67990043
Note that current z-files for linux/amd64,386,arm are based on 3.2 kernel.
LGTM=iant
R=golang-codereviews, dave, bradfitz, gobot, iant
CC=golang-codereviews
https://golang.org/cl/59160044
runfinqv is already defined the same way on line 271.
There may also be something to fix in compiler/linker wrt diagnostics.
Fixes#7375.
LGTM=bradfitz
R=golang-codereviews, dave, bradfitz
CC=golang-codereviews
https://golang.org/cl/67850044
Update #7347
When runtime.panic is called the *Panic is malloced from the heap. This can lead to a gc cycle while panicing which can make a bad situation worse.
It appears to be possible to stack allocate the Panic and avoid malloc'ing during a panic.
Ref: https://groups.google.com/d/topic/golang-dev/OfxqpklGkh0/discussion
LGTM=minux.ma, dvyukov, rsc
R=r, minux.ma, gobot, rsc, dvyukov
CC=golang-codereviews
https://golang.org/cl/66830043
This lays the groundwork for making Go robust when the system's
calendar time jumps around. All input values to the runtimeTimer
struct now use the runtime clock as a common reference point.
This affects net.Conn.Set[Read|Write]Deadline(), time.Sleep(),
time.Timer, etc. Under normal conditions, behavior is unchanged.
Each platform and architecture's implementation of runtime·nanotime()
should be modified to use a monotonic system clock when possible.
Platforms/architectures modified and tested with monotonic clock:
linux/x86 - clock_gettime(CLOCK_MONOTONIC)
Update #6007
LGTM=dvyukov, rsc
R=golang-codereviews, dvyukov, alex.brainman, stephen.gutekanst, dave, rsc, mikioh.mikioh
CC=golang-codereviews
https://golang.org/cl/53010043
After "runtime: combine small NoScan allocations" finalizers
for small objects run more non deterministically.
TestRaceFin episodically fails on my darwin/amd64.
LGTM=khr
R=golang-codereviews, khr, dave
CC=golang-codereviews
https://golang.org/cl/56970043
As per request from minux in CL 61520049, this CL consolidates
existing test cases for Unix-like systems into one file except
Linux-specific credential test.
LGTM=bradfitz
R=iant, minux.ma, bradfitz
CC=golang-codereviews
https://golang.org/cl/67800044
crypto/tls has two functions for creating a client connection: Dial,
which most users are expected to use, and Client, which is the
lower-level API.
Dial does what you expect: it gives you a secure connection to the host
that you specify and the majority of users of crypto/tls appear to work
fine with it.
Client gives more control but needs more care. Specifically, if it
wasn't given a server name in the tls.Config then it didn't check that
the server's certificates match any hostname - because it doesn't have
one to check against. It was assumed that users of the low-level API
call VerifyHostname on the certificate themselves if they didn't supply
a hostname.
A review of the uses of Client both within Google and in a couple of
external libraries has shown that nearly all of them got this wrong.
Thus, this change enforces that either a ServerName or
InsecureSkipVerify is given. This does not affect tls.Dial.
See discussion at https://groups.google.com/d/msg/golang-nuts/4vnt7NdLvVU/b1SJ4u0ikb0J.
Fixes#7342.
LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/67010043
SetPanicOnFault allows recovery from unexpected memory faults.
This can be useful if you are using a memory-mapped file
or probing the address space of the current program.
LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/66590044
Package runtime's C functions written to be called from Go
started out written in C using carefully constructed argument
lists and the FLUSH macro to write a result back to memory.
For some functions, the appropriate parameter list ended up
being architecture-dependent due to differences in alignment,
so we added 'goc2c', which takes a .goc file containing Go func
declarations but C bodies, rewrites the Go func declaration to
equivalent C declarations for the target architecture, adds the
needed FLUSH statements, and writes out an equivalent C file.
That C file is compiled as part of package runtime.
Native Client's x86-64 support introduces the most complex
alignment rules yet, breaking many functions that could until
now be portably written in C. Using goc2c for those avoids the
breakage.
Separately, Keith's work on emitting stack information from
the C compiler would require the hand-written functions
to add #pragmas specifying how many arguments are result
parameters. Using goc2c for those avoids maintaining #pragmas.
For both reasons, use goc2c for as many Go-called C functions
as possible.
This CL is a replay of the bulk of CL 15400047 and CL 15790043,
both of which were reviewed as part of the NaCl port and are
checked in to the NaCl branch. This CL is part of bringing the
NaCl code into the main tree.
No new code here, just reformatting and occasional movement
into .h files.
LGTM=r
R=dave, alex.brainman, r
CC=golang-codereviews
https://golang.org/cl/65220044
Match used len(ar.files) == 0 to mean "match everything"
but it also deleted matched things from the list, so once you
had matched everything you asked for, match returned true
for whatever was left in the archive too.
Concretely, if you have an archive containing f1, f2, then
pack t foo.a f1
would match f1 and then, because len(ar.files) == 0 after
deleting f1 from the match list, also match f2.
Avoid the problem by recording explicitly whether match
matches everything.
LGTM=r, dsymonds
R=r, dsymonds
CC=golang-codereviews
https://golang.org/cl/65630046
Rename should fail when the directory doesn't match.
It will fix the newly introduced test from cmd/pack
on Plan 9.
LGTM=r
R=golang-codereviews, r
CC=golang-codereviews
https://golang.org/cl/65270044
Try to prevent messages like this:
'./pack' file does not exist����������������������������������������������������������������������������������������������������
TBR=adonovan
LGTM=adonovan
R=adonovan
CC=golang-codereviews
https://golang.org/cl/66270043
Get more information to help understand build failure on Plan 9.
Also Windows.
(TestHello is failing because GOCHAR does not appear in output.
What does?)
Update #7362
LGTM=bradfitz
R=rsc, bradfitz
CC=golang-codereviews
https://golang.org/cl/66070044
[Repeat of CL 64100044, after 32-bit fix in CL 66170043.]
Precisestack makes stack collection completely precise,
in the sense that there are no "used and not set" errors
in the collection of stack frames, no times where the collector
reads a pointer from a stack word that has not actually been
initialized with a pointer (possibly a nil pointer) in that function.
The most important part is interfaces: precisestack means
that if reading an interface value, the interface value is guaranteed
to be initialized, meaning that the type word can be relied
upon to be either nil or a valid interface type word describing
the data word.
This requires additional zeroing of certain values on the stack
on entry, which right now costs about 5% overall execution
time in all.bash. That cost will come down before Go 1.3
(issue 7345).
There are at least two known garbage collector bugs right now,
issues 7343 and 7344. The first happens even without precisestack.
The second I have only seen with precisestack, but that does not
mean that precisestack is what causes it. In fact it is very difficult
to explain by what precisestack does directly. Precisestack may
be exacerbating an existing problem. Both of those issues are
marked for Go 1.3 as well.
The reasons for enabling precisestack now are to give it more
time to soak and because the copying stack work depends on it.
LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/65820044
The code here is being restored after its deletion in CL 14430048.
I restored the copy in cmd/6g in CL 56430043 but neglected the
other two.
This is the reason that enabling precisestack only worked on amd64.
LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/66170043
When Go 1.3 is released, this will keep existing
Go 1.2 build scripts that use 'go tool pack grc' working.
For efficiency, such scripts should be changed to
use 6g -pack instead, but keeping the old behavior
available enables a more graceful transition.
LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/66130043
There are probably more of these, but bound and len are 64 bits so use %lld
in message about array index out of bounds.
Fixes the 386 build.
LGTM=bradfitz, rsc
R=rsc, bradfitz
CC=golang-codereviews, rickarnoldjr
https://golang.org/cl/66110043
We never updated libmach for the new object file format,
so it the existing 'go tool addr2line' is broken.
Reimplement in Go to fix.
LGTM=r
R=golang-codereviews, r
CC=golang-codereviews
https://golang.org/cl/66020043
The error message was previously off by one in all cases.
Fixes#7150.
LGTM=r
R=golang-codereviews, r
CC=golang-codereviews
https://golang.org/cl/65850043
Users of the low-level, Client function are frequenctly missing the
fact that, unless they pass a ServerName to the TLS connection then it
cannot verify the certificates against any name.
This change makes it clear that at least one of InsecureSkipVerify and
ServerName should always be set.
LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/65440043
Update #6853
For an ephemeral binary - one created, run, and then deleted -
there is no need to write dwarf debug information, since the
binary will not be used with gdb. In this case, instruct the linker
not to spend time and disk space generating the debug information
by passing the -w flag to the linker.
Omitting dwarf information reduces the size of most binaries by 25%.
We may be more aggressive about this in the future.
LGTM=bradfitz, r
R=r, bradfitz
CC=golang-codereviews
https://golang.org/cl/65890043
Update #6853
Every function now has a gcargs and gclocals symbol
holding associated garbage collection information.
Put them all in the same meta-symbol as the go.func data
and then drop individual entries from symbol table.
Removing gcargs and gclocals reduces the size of a
typical binary by 10%.
LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/65870044
IsNil isn't quite the same as == nil, as this snippet shows:
// http://play.golang.org/p/huomslDZgw
package main
import "fmt"
import "reflect"
func main() {
var i interface{}
v := reflect.ValueOf(i)
fmt.Println(v.IsValid(), i == nil)
fmt.Println(v.IsNil())
}
The fact that IsNil panics if you call it with an untyped nil
was not apparent. Verbiage added for clarity.
LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/65480043
Update #6853
Nothing reads the Plan 9 symbol table anymore.
The last holdout was 'go tool nm', but since being rewritten in Go
it uses the standard symbol table for the binary format
(ELF, Mach-O, PE) instead.
Removing the Plan 9 symbol table saves ~15% disk space
on most binaries.
Two supporting changes included in this CL:
debug/gosym: use Go 1.2 pclntab to synthesize func-only
symbol table when there is no Plan 9 symbol table
debug/elf, debug/macho, debug/pe: ignore final EOF from ReadAt
LGTM=r
R=r, bradfitz
CC=golang-codereviews
https://golang.org/cl/65740045
The code was returning the original value rather than the cloned value
resulting in the tests not being repeatable.
Fixes#7111.
LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/65720045
