net: add Resolver type, Dialer.Resolver, and DefaultResolver
The new Resolver type (a struct) has 9 Lookup methods, all taking a
context.Context.
There's now a new DefaultResolver global, like http's
DefaultTransport and DefaultClient.
net.Dialer now has an optional Resolver field to set the Resolver.
This also does finishes some resolver cleanup internally, deleting
lookupIPMerge and renaming lookupIPContext into Resolver.LookupIPAddr.
The Resolver currently doesn't let you tweak much, but it's a struct
specifically so we can add knobs in the future. Currently I just added
a bool to force the pure Go resolver. In the future we could let
people provide an interface to implement the methods, or add a Timeout
time.Duration, which would wrap all provided contexts in a
context.WithTimeout.
Fixes #16672
Change-Id: I7ba1f886704f06def7b6b5c4da9809db51bc1495
Reviewed-on: https://go-review.googlesource.com/29440
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
Austin Clements [Mon, 9 May 2016 19:12:07 +0000 (15:12 -0400)]
runtime: remove unnecessary atomics from heapBitSetType
These used to be necessary when racing with updates to the mark bit,
but since the mark bit is no longer in the bitmap and the checkmark is
only updated with the world stopped, we can now always use regular
writes to update the type information in the heap bitmap.
Somewhat surprisingly, this has basically no overall performance
effect beyond the usual noise, but it does clean up the code.
Yasuhiro Matsumoto [Wed, 24 Aug 2016 01:34:16 +0000 (10:34 +0900)]
os: use GetConsoleCP() instead of GetACP()
It is possible (and common) for Windows systems to use a different codepage
for console applications from that used on normal windowed application
(called ANSI codepage); for instance, most of the western Europe uses
CP850 for console (for backward compatibility with MS-DOS), while
windowed applications use a different codepage depending on the country
(eg: CP1252 aka Latin-1). The usage being changed with this commit is
specifically related to decoding input coming from the console, so the
previous usage of the ANSI codepage was wrong.
Also fixes an issue that previous did convert bytes as NFD. Go is
designed to handle single Unicode code point. This fix change behaivor
to NFC.
Change-Id: I939f087df133710495fdf6f09040051cb9b176d7
Reviewed-on: https://go-review.googlesource.com/29442 Reviewed-by: Ian Lance Taylor <iant@golang.org>
Austin Clements [Thu, 25 Aug 2016 15:50:50 +0000 (11:50 -0400)]
runtime: consistency check for G rescan position
Issue #17099 shows a failure that indicates we rescanned a stack twice
concurrently during mark termination, which suggests that the rescan
list became inconsistent. Add a simple check when we dequeue something
from the rescan list that it claims to be at the index where we found
it.
Austin Clements [Thu, 25 Aug 2016 15:52:24 +0000 (11:52 -0400)]
runtime: report GCSys and OtherSys in heap profile
The comment block at the end of the heap profile includes *almost*
everything from MemStats. Add the missing fields. These are useful for
debugging RSS that has gone to GC-internal data structures.
On ARM, DIV, DIVU, MOD, MODU are pseudo instructions that makes
runtime calls _div/_udiv/_mod/_umod, which themselves are wrappers
of udiv. The udiv function does the real thing.
Instead of generating these pseudo instructions, call to udiv
directly. This removes one layer of wrappers (which has an awkward
way of passing argument), and also allows combining DIV and MOD
if both results are needed.
Change-Id: I118afc3986db3a1daabb5c1e6e57430888c91817
Reviewed-on: https://go-review.googlesource.com/29390 Reviewed-by: David Chase <drchase@google.com>
David Crawshaw [Mon, 19 Sep 2016 18:11:20 +0000 (14:11 -0400)]
cmd/internal/obj, cmd/link: darwin dynlink support
This makes it possible for cmd/compile, when run with -dynlink on
darwin/amd64, to generate TLS_LE relocations which the linker then
turns into the appropriate PC-relative GOT load.
Change-Id: I1a71da432608bdb108ff66c22de600100209c873
Reviewed-on: https://go-review.googlesource.com/29393 Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
David Crawshaw [Sat, 17 Sep 2016 13:39:33 +0000 (09:39 -0400)]
cmd/link: replace ld.Link.Diag with ld.Errorf
Instead of using ctxt.Cursym, Errorf takes an explicit *Symbol
parameter. This removes most uses of Cursym and means the *Link
context object is needed in fewer parts of the linker.
All transformations done manually, as wiring Cursym is tricky.
Change-Id: Ief88b00b73904224675c0035684c3a84c19249d7
Reviewed-on: https://go-review.googlesource.com/29369 Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Keith Randall [Mon, 19 Sep 2016 22:26:48 +0000 (15:26 -0700)]
doc: mention KeepAlive & input args change
Change-Id: Icfb38f492ae71432858b7104fcba18a9ba835192
Reviewed-on: https://go-review.googlesource.com/29410 Reviewed-by: Ian Lance Taylor <iant@golang.org>
Rob Pike [Sun, 18 Sep 2016 04:35:42 +0000 (14:35 +1000)]
time: allow long fractions in ParseDuration
The code scanned for an integer after a decimal point, which
meant things could overflow if the number was very precise
(0.1234123412341234123412342134s). This fix changes the
parser to stop adding precision once we run out of bits, rather
than trigger an erroneous overflow.
We could parse durations using floating-point arithmetic,
but since the type is int64 and float64 has only has 53 bits
of precision, that would be imprecise.
Carlos Eduardo Seo [Tue, 12 Apr 2016 21:38:00 +0000 (18:38 -0300)]
cmd/asm, cmd/internal/obj/ppc64: add ppc64 vector registers and instructions
The current implementation for Power architecture does not include the vector
(Altivec) registers. This adds the 32 VMX registers and the most commonly used
instructions: X-form loads/stores; VX-form logical operations, add/sub,
rotate/shift, count, splat, SHA Sigma and AES cipher; VC-form compare; and
VA-form permute, shift, add/sub and select.
Fixes #15619
Change-Id: I544b990631726e8fdfcce8ecca0aeeb72faae9aa
Reviewed-on: https://go-review.googlesource.com/25600
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com> Reviewed-by: David Chase <drchase@google.com>
Keith Randall [Fri, 16 Sep 2016 20:50:18 +0000 (13:50 -0700)]
cmd/compile: cache CFG-dependent computations
We compute a lot of stuff based off the CFG: postorder traversal,
dominators, dominator tree, loop nest. Multiple phases use this
information and we end up recomputing some of it. Add a cache
for this information so if the CFG hasn't changed, we can reuse
the previous computation.
Change-Id: I9b5b58af06830bd120afbee9cfab395a0a2f74b2
Reviewed-on: https://go-review.googlesource.com/29356 Reviewed-by: David Chase <drchase@google.com>
Trey Lawrence [Tue, 23 Aug 2016 20:43:43 +0000 (16:43 -0400)]
cmd/compile: fix compiler bug for constant equality comparison
The compiler incorrectly will error when comparing a nil pointer
interface to a nil pointer of any other type. Example:
(*int)(nil) == interface{}(nil)
Will error with "gc: illegal constant expression: *int == interface {}"
Fixes #16702
Change-Id: I1a15d651df2cfca6762b1783a28b377b2e6ff8c6
Reviewed-on: https://go-review.googlesource.com/27591
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Matthew Dempsky [Fri, 16 Sep 2016 22:31:04 +0000 (15:31 -0700)]
cmd/internal/obj: replace AGLOBL with (*Link).Globl
Replace the AGLOBL pseudo-op with a method to directly register an
LSym as a global. Similar to how we previously already replaced the
ADATA pseudo-op with directly writing out data bytes.
Passes toolstash -cmp.
Change-Id: I3631af0a2ab5798152d0c26b833dc309dbec5772
Reviewed-on: https://go-review.googlesource.com/29366
Run-TryBot: Matthew Dempsky <mdempsky@google.com> Reviewed-by: Dave Cheney <dave@cheney.net>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Dan Peterson [Thu, 15 Sep 2016 20:24:42 +0000 (17:24 -0300)]
net: respect resolv.conf rotate option
Instead of ranging over servers in the config, grab an offset
from the config that is used to determine indices.
When the rotate option is enabled, the offset increases which
rotates queries through servers. Otherwise, it is always 0
which uses servers in config order.
Fixes #17126
Change-Id: If233f6de7bfa42f88570055b9ab631be08a76b3e
Reviewed-on: https://go-review.googlesource.com/29233 Reviewed-by: Matthew Dempsky <mdempsky@google.com>
David Crawshaw [Fri, 16 Sep 2016 22:53:46 +0000 (18:53 -0400)]
cmd/dist: disable plugin test on arm64
Mysterious error and no time or easy machine access to investigate
now, so disabling the -buildmode=plugin test on arm64. (The arm
version is working as expected.)
David Crawshaw [Fri, 16 Sep 2016 21:15:12 +0000 (17:15 -0400)]
cmd/dist: skip libgcc test on arm64 and mips64
This test was always being run with external linking on these
platforms because the linker was silently forcing external linking
until CL 28971. Now it produces an error instead.
Change-Id: I794e0812711e05b150daf805dc3451507bb4cae8
Reviewed-on: https://go-review.googlesource.com/29360
Run-TryBot: David Crawshaw <crawshaw@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Keith Randall [Fri, 16 Sep 2016 19:11:33 +0000 (12:11 -0700)]
cmd/compile: turn live variable test off for ppc
ppc64 has an extraneous variable live in some situations.
We need a better tighten pass to get rid of this extra variable.
I'm working on it, but fix the test in the meantime.
Fixes build for ppc64.
Change-Id: I1efb9ccb234a64f2a1c228abd2b3195f67fbeb41
Reviewed-on: https://go-review.googlesource.com/29353 Reviewed-by: David Chase <drchase@google.com>
Keith Randall [Fri, 16 Sep 2016 16:36:00 +0000 (09:36 -0700)]
cmd/compile: reorganize SSA register numbering
Teach SSA about the cmd/internal/obj/$ARCH register numbering.
It can then return that numbering when requested. Each architecture
now does not need to know anything about the internal SSA numbering
of registers.
Change-Id: I34472a2736227c15482e60994eebcdd2723fa52d
Reviewed-on: https://go-review.googlesource.com/29249 Reviewed-by: David Chase <drchase@google.com>
David Crawshaw [Fri, 16 Sep 2016 15:35:53 +0000 (11:35 -0400)]
cmd/link: give RelocVariant a type, document Reloc
Change-Id: Ib20263405a08674b5e160295fc965da4c8b54b34
Reviewed-on: https://go-review.googlesource.com/29248 Reviewed-by: Ian Lance Taylor <iant@golang.org>
David Crawshaw [Fri, 9 Sep 2016 21:34:07 +0000 (17:34 -0400)]
cmd/link: attempt to rationalize linkmode init
This CL gives Linkmode a type, switches it to the standard flag
handling mechanism, and deduplicates some logic.
There is a semantic change in this CL. Previously if a link was
invoked explicitly with -linkmode=internal, any condition that forced
external linking would silently override this and use external
linking. Instead it now fails with a reason why. I believe this is an
improvement, but will change it back if there's disagreement.
Fixes #12848
Change-Id: Ic80e341fff65ecfdd2b6fdd6079674cc7210fc5f
Reviewed-on: https://go-review.googlesource.com/28971
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
David Crawshaw [Fri, 26 Aug 2016 12:51:58 +0000 (08:51 -0400)]
cmd/go: support -buildmode=plugin on linux
Change-Id: I0c8a04457db28c55c35c9a186b63c40f40730e39
Reviewed-on: https://go-review.googlesource.com/27824 Reviewed-by: Ian Lance Taylor <iant@golang.org>
Bias {Eq,Neq}{8,16} to prefer the extension likely to match
their operand's load (if loaded), and elide sign and zero
extending MOV{B,W}, MOV{B,W}Z when their operands are already
appropriately extended.
Matthew Dempsky [Thu, 15 Sep 2016 23:33:11 +0000 (16:33 -0700)]
cmd/compile: remove traces of old register allocator
Only added lines are moving amd64 and x86's ginsnop functions from
gsubr.go to ggen.go to match other architectures, so all of the
gsubr.go files can go away.
Change-Id: Ib2292460c155ae6d9dcf5c9801f178031d8eea7a
Reviewed-on: https://go-review.googlesource.com/29240
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Dave Cheney <dave@cheney.net>
Alberto Bertogli [Thu, 15 Sep 2016 01:32:44 +0000 (02:32 +0100)]
net: document dummy byte in ReadMsgUnix and WriteMsgUnix
ReadMsgUnix and WriteMsgUnix both will read/write 1 byte from/to the
socket if they were given no buffer to read/write, to avoid a common
pitfall in out of band operations (they will usually block
indefinitely if there's no actual data to read).
This patch adds a note about this behaviour in their documentation, so
users can be aware of it.
Change-Id: I751f0e12bb4d80311e94ea8de023595c5d40ec3e
Reviewed-on: https://go-review.googlesource.com/29180
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
David Chase [Thu, 15 Sep 2016 20:51:35 +0000 (16:51 -0400)]
cmd/compile: adapt GOSSAHASH to set a DebugTest flag in ssa.Config
Binary search remains our friend.
Suppose you add an ought-to-be-benign pattern to PPC64.rules,
and make.bash starts crashing. You can guard the pattern(s)
with config.DebugTest:
David Chase [Thu, 15 Sep 2016 16:43:29 +0000 (12:43 -0400)]
cmd/compile: repair GOSSAFUNC functionality
GOSSAFUNC=foo had previously only done printing for the
single function foo, and didn't quite clean up after itself
properly. Changes ensures that Config.HTML != nil iff
GOSSAFUNC==name-of-current-function.
Change-Id: I255e2902dfc64f715d93225f0d29d9525c06f764
Reviewed-on: https://go-review.googlesource.com/29250
Run-TryBot: David Chase <drchase@google.com> Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The only remaining consumers of gins were
ginsnop and arch-independent opcodes like GVARDEF.
Rewrite ginsnop to create and populate progs directly.
Move arch-independent opcodes to package gc
and simplify.
Delete some now unused code.
There is more.
Step one towards eliminating gc.Node.Reg.
cmd/compile: unroll comparisons to short constant strings
Unroll s == "ab" to
len(s) == 2 && s[0] == 'a' && s[1] == 'b'
This generates faster and shorter code
by avoiding a runtime call.
Do something similar for !=.
The cutoff length is 6. This was chosen empirically
by examining binary sizes on arm, arm64, 386, and amd64
using the SSA backend.
For all architectures examined, 4, 5, and 6 were
the ideal cutoff, with identical binary sizes.
The distribution of constant string equality sizes
during 'go build -a std' is:
40.81% 622 len 0
14.11% 215 len 4
9.45% 144 len 1
7.81% 119 len 3
7.48% 114 len 5
5.12% 78 len 7
4.13% 63 len 2
3.54% 54 len 8
2.69% 41 len 6
1.18% 18 len 10
0.85% 13 len 9
0.66% 10 len 14
0.59% 9 len 17
0.46% 7 len 11
0.26% 4 len 12
0.20% 3 len 19
0.13% 2 len 13
0.13% 2 len 15
0.13% 2 len 16
0.07% 1 len 20
0.07% 1 len 23
0.07% 1 len 33
0.07% 1 len 36
A cutoff of length 6 covers most of the cases.
Benchmarks on amd64 comparing a string to a constant of length 3:
The change to the prove test preserves the
existing intent of the test. When the string was
short, there was a new "proved in bounds" report
that referred to individual byte comparisons.
Dave Cheney [Thu, 15 Sep 2016 05:45:10 +0000 (15:45 +1000)]
cmd/compile/internal/gc: unexport more helper functions
After the removal of the old backend many types are no longer referenced
outside internal/gc. Make these functions private so that tools like
honnef.co/go/unused can spot when they become dead code. In doing so
this CL identified several previously public helpers which are no longer
used, so removes them.