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43693 Commits

Author SHA1 Message Date
Michael Anthony Knyszek
eacdf76b93 runtime: add bitmap-based markrootSpans implementation
Currently markrootSpans, the scanning routine which scans span specials
(particularly finalizers) as roots, uses sweepSpans to shard work and
find spans to mark.

However, as part of a future CL to change span ownership and how
mcentral works, we want to avoid having markrootSpans use the sweep bufs
to find specials, so in this change we introduce a new mechanism.

Much like for the page reclaimer, we set up a per-page bitmap where the
first page for a span is marked if the span contains any specials, and
unmarked if it has no specials. This bitmap is updated by addspecial,
removespecial, and during sweeping.

markrootSpans then shards this bitmap into mark work and markers iterate
over the bitmap looking for spans with specials to mark. Unlike the page
reclaimer, we don't need to use the pageInUse bits because having a
special implies that a span is in-use.

While in terms of computational complexity this design is technically
worse, because it needs to iterate over the mapped heap, in practice
this iteration is very fast (we can skip over large swathes of the heap
very quickly) and we only look at spans that have any specials at all,
rather than having to touch each span.

This new implementation of markrootSpans is behind a feature flag called
go115NewMarkrootSpans.

Updates #37487.

Change-Id: I8ea07b6c11059f6d412fe419e0ab512d989377b8
Reviewed-on: https://go-review.googlesource.com/c/go/+/221178
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
2020-04-21 22:50:51 +00:00
Matthew Dempsky
2a2423bd05 cmd/compile: more precise analysis of method values
Previously for a method value "x.M", we always flowed x directly to
the heap, which led to the receiver argument generally needing to be
heap allocated.

This CL changes it to flow x to the closure and M's receiver
parameter. This allows receiver arguments to be stack allocated as
long as (1) the closure never escapes, *and* (2) method doesn't leak
its receiver parameter.

Within the standard library, this allows a handful of objects to be
stack allocated instead. Listed here are diagnostics that were
previously emitted by "go build -gcflags=-m std cmd" that are no
longer emitted:

archive/tar/writer.go:118:6: moved to heap: f
archive/tar/writer.go:208:6: moved to heap: f
archive/tar/writer.go:248:6: moved to heap: f
cmd/compile/internal/gc/initorder.go:252:2: moved to heap: d
cmd/compile/internal/gc/initorder.go:75:2: moved to heap: s
cmd/go/internal/generate/generate.go:206:7: &Generator literal escapes to heap
cmd/internal/obj/arm64/asm7.go:910:2: moved to heap: c
cmd/internal/obj/mips/asm0.go:415:2: moved to heap: c
cmd/internal/obj/pcln.go:294:22: new(pcinlineState) escapes to heap
cmd/internal/obj/s390x/asmz.go:459:2: moved to heap: c
crypto/tls/handshake_server.go:56:2: moved to heap: hs

Thanks to Cuong Manh Le for help coming up with this solution.

Fixes #27557.

Change-Id: I8c85d671d07fb9b53e11d2dd05949a34dbbd7e17
Reviewed-on: https://go-review.googlesource.com/c/go/+/228263
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2020-04-21 20:49:34 +00:00
Matthew Dempsky
1811533695 cmd/compile: refactor Escape.tagHole
This CL refactors tagHole to handle all three call situations (unknown
function; known function in same analysis batch; known function in
previous analysis batch). This will make it somewhat easier to reuse
in a followup CL.

Passes toolstash-check.

Change-Id: I764d047a333dfc593d721a881361683e94b485df
Reviewed-on: https://go-review.googlesource.com/c/go/+/229059
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
2020-04-21 20:48:43 +00:00
Michael Pratt
300ff5d8ac runtime: allow proflock and mheap.speciallock above globalAlloc.mutex
During schedinit, these may occur in:

mProf_Malloc
  stkbucket
    newBucket
      persistentalloc
        persistentalloc1

mProf_Malloc
  setprofilebucket
    fixalloc.alloc
      persistentalloc
        persistentalloc1

These seem to be legitimate lock orderings.

Additionally, mheap.speciallock had a defined rank, but it was never
actually used. That is fixed now.

Updates #38474

Change-Id: I0f6e981852eac66dafb72159f426476509620a65
Reviewed-on: https://go-review.googlesource.com/c/go/+/228786
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
2020-04-21 20:22:06 +00:00
Michael Munday
e464d7d797 cmd/compile: optimize comparisons with immediates on s390x
When generating code for unsigned equals (==) and not equals (!=)
comparisons we currently, on s390x, always use signed comparisons.

This mostly works well, however signed comparisons on s390x sign
extend their immediates and unsigned comparisons zero extend them.
For compare-and-branch instructions which can only have 8-bit
immediates this significantly changes the range of immediate values
we can represent: [-128, 127] for signed comparisons and [0, 255]
for unsigned comparisons.

When generating equals and not equals checks we don't neet to worry
about whether the comparison is signed or unsigned. This CL
therefore adds rules to allow us to switch signedness for such
comparisons if it means that it brings a constant into range for an
8-bit immediate.

For example, a signed equals with an integer in the range [128, 255]
will now be implemented using an unsigned compare-and-branch
instruction rather than separate compare and branch instructions.

As part of this change I've also added support for adding a name
to block control values using the same `x:(...)` syntax we use for
value rules.

Triggers 792 times when compiling cmd and std.

Change-Id: I77fa80a128f0a8ce51a2888d1e384bd5e9b61a77
Reviewed-on: https://go-review.googlesource.com/c/go/+/228642
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2020-04-21 19:23:51 +00:00
Josh Bleecher Snyder
099c6116cc Revert "runtime/pprof: speed up CPU profiling shutdown"
This reverts commit 1f0738c157.

Reason for revert: This May have caused issue 38567.

Change-Id: I2afa6a9d42cb29cfad09e706fb465c57e3774abd
Reviewed-on: https://go-review.googlesource.com/c/go/+/229301
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
2020-04-21 19:17:57 +00:00
Cuong Manh Le
05db7de1c1 cmd/compile: remove unused nlo function
Change-Id: I858d666d491f649f78581a43437408ffab33863b
Reviewed-on: https://go-review.googlesource.com/c/go/+/229139
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Munday <mike.munday@ibm.com>
2020-04-21 18:41:44 +00:00
Cuong Manh Le
65c9b57566 cmd/compile: remove nlz function
Use nlzX variants instead. While at it, also remove tests involve
nlz/nlo/nto/log2, since when we are calling directly "math/bits"
functions.

Passes toolstash-check.

Change-Id: I83899741a29e05bc2c19d73652961ac795001781
Reviewed-on: https://go-review.googlesource.com/c/go/+/229138
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2020-04-21 18:15:14 +00:00
Alberto Donizetti
a95bf77e1a cmd/compile: convert last 386 rules to typed aux
Passes

  GOARCH=386 gotip build -toolexec 'toolstash -cmp' -a std

Change-Id: I4d1ca83d37ab9f628fc3f1261fe40b81e59137ff
Reviewed-on: https://go-review.googlesource.com/c/go/+/229100
Reviewed-by: Keith Randall <khr@golang.org>
2020-04-21 17:18:24 +00:00
Jay Conrod
65f46486a1 cmd/go/internal/load: load imports for all package data errors
go/build.Import can return errors for many different reasons like
inconsistent package clauses or errors parsing build constraints.
It will still return a *build.Package with imports from files it was
able to process. Package.load should load these imports, even after an
unknown error.

There is already a special case for scanner.ErrorList (parse
error). This CL expands that behavior for all errors.

Fixes #38568

Change-Id: I871827299c556f1a9a5b12e7755b221e9d8c6e0e
Reviewed-on: https://go-review.googlesource.com/c/go/+/229243
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2020-04-21 17:11:39 +00:00
Russ Cox
768201729d cmd/compile: detect and diagnose invalid //go: directive placement
Thie CL changes cmd/compile/internal/syntax to give the gc half of
the compiler more control over pragma handling, so that it can prepare
better errors, diagnose misuse, and so on. Before, the API between
the two was hard-coded as a uint16. Now it is an interface{}.
This should set us up better for future directives.

In addition to the split, this CL emits a "misplaced compiler directive"
error for any directive that is in a place where it has no effect.
I've certainly been confused in the past by adding comments
that were doing nothing and not realizing it. This should help
avoid that kind of confusion.

The rule, now applied consistently, is that a //go: directive
must appear on a line by itself immediately before the declaration
specifier it means to apply to. See cmd/compile/doc.go for
precise text and test/directive.go for examples.

This may cause some code to stop compiling, but that code
was broken. For example, this code formerly applied the
//go:noinline to f (not c) but now will fail to compile:

	//go:noinline
	const c = 1

	func f() {}

Change-Id: Ieba9b8d90a27cfab25de79d2790a895cefe5296f
Reviewed-on: https://go-review.googlesource.com/c/go/+/228578
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2020-04-21 16:47:01 +00:00
Than McIntosh
7a22f11e96 [dev.link] cmd/link: separate out DWARF processing from dodata's allocateSections
Split out DWARF symbol-to-section assignment into its own separate
helper routine, to improve readability. No change in functionality.

Change-Id: Ic2e4f4d99afbff65161cbb8bd63e866ea555f322
Reviewed-on: https://go-review.googlesource.com/c/go/+/228957
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
2020-04-21 16:30:47 +00:00
Than McIntosh
87b43088cd [dev.link] cmd/link: refactor section creation in dodata
Additional cleanups and refactorings in the allocateSections portion
of dodata. Introduce some new helper routines to be used for common
cases in creating sections and assigning symbols, with a goal of
reducing duplicated code blocks and having more readable code.

No change in functionality.

Change-Id: I1b020b3ee993674329b2bebfd7c35995e3a2c043
Reviewed-on: https://go-review.googlesource.com/c/go/+/228883
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
2020-04-21 16:26:42 +00:00
BurtonQin
4f27e1d7aa cmd/go/internal/modfetch: add Unlock before return in checkModSum
In cmd/go/internal/modfetch/fetch.go,
`checkModSum()` forgets Unlock before return, which may lead to deadlock.
876c1feb7d/src/cmd/go/internal/modfetch/fetch.go (L514-L520)
The fix is to add `goSum.mu.Unlock()` before return.

Change-Id: I855b1c1bc00aeada2c1e84aabb5328f02823007d
GitHub-Last-Rev: afeb3763dd
GitHub-Pull-Request: golang/go#38563
Reviewed-on: https://go-review.googlesource.com/c/go/+/229219
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
2020-04-21 15:37:29 +00:00
Rohith Ravi
af55060b39 cmd/trace: fix the broken link in region pages and improve UX
The trace tool had a broken link due to a parameter encoding error,
which has been corrected.

In addition:

- the user regions page has been enhanced to include links to
pprof style profiles for region specific io, block, syscall and
schedwait profiles.

- sortable table headers have a pointer cursor to indicate they're
clickable.

Fixes #38518

Change-Id: I26cd5157bd9753750f5f53ea03aac5d2d41b021c
Reviewed-on: https://go-review.googlesource.com/c/go/+/228899
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
2020-04-21 14:57:43 +00:00
Cherry Zhang
47cac82e36 [dev.link] cmd/link: convert symtab pass to new style
This is more or less a direct translation, to get things going.
There are more things we can do to make it better, especially on
the handling of container symbols.

Change-Id: I11a0087e402be8d42b9d06869385ead531755272
Reviewed-on: https://go-review.googlesource.com/c/go/+/229125
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
2020-04-21 14:29:02 +00:00
Richard Miller
664d270727 os: correct bad PathError message from FileOpen with O_CREATE on Plan 9
On Plan 9, FileOpen with flag O_CREATE & ~O_TRUNC is done in two
steps.  First, syscall.Open is attempted, to avoid truncation when opening
an existing file.  If that fails because the file doesn't exist,
syscall.Create is used to create a new file.  If the Create fails,
for example because we are racing with another process to create a
ModeExclusive file, the PathError returned from FileOpen should reflect
the result of the Create, not the "does not exist" error from the initial
Open attempt.

Fixes #38540

Change-Id: I90c95a301de417ecdf79cd52748591edb1dbf528
Reviewed-on: https://go-review.googlesource.com/c/go/+/229099
Run-TryBot: David du Colombier <0intro@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David du Colombier <0intro@gmail.com>
2020-04-21 11:41:40 +00:00
alex-semenyuk
876c1feb7d test/codegen, runtime/pprof, runtime: apply fmt
Change-Id: Ife4e065246729319c39e57a4fbd8e6f7b37724e1
GitHub-Last-Rev: e71803eaeb
GitHub-Pull-Request: golang/go#38527
Reviewed-on: https://go-review.googlesource.com/c/go/+/228901
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
2020-04-21 09:07:42 +00:00
Alberto Donizetti
17fbc818ff cmd/compile: switch to typed aux for 386 optimization rules
Convert first section of 386 optimization rules to the typed aux form.

Adds addOffset{32,64} functions that returns ValAndOffs and a
ValAndOff.canAdd32 function that takes an int32.

Passes

  GOARCH=386 gotip build -toolexec 'toolstash -cmp' -a std

Change-Id: I69d2a8ace6936d5e8ba6ba047183002bf07dd5be
Reviewed-on: https://go-review.googlesource.com/c/go/+/228825
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2020-04-21 08:08:49 +00:00
Josh Bleecher Snyder
4974ac6874 cmd/compile: use cheaper implementation of oneBit
This is the second attempt. The first attempt was CL 229127,
which got rolled back by CL 229177, because it caused
an infinite loop during compilation on some platforms.
I didn't notice that the trybots hadn't completed when I submitted; mea culpa.

The bug was that we were checking x&(x-1)==0, which is also true of 0,
which does not have exactly one bit set.
This caused an infinite rewrite rule loop.

Updates #38547

file    before    after     Δ       %
compile 19678112  19669808  -8304   -0.042%
total   113143160 113134856 -8304   -0.007%

Change-Id: I417a4f806e1ba61277e31bab2e57dd3f1ac7e835
Reviewed-on: https://go-review.googlesource.com/c/go/+/229197
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Munday <mike.munday@ibm.com>
2020-04-21 05:56:02 +00:00
Matthew Dempsky
0eb694e9c2 reflect: disallow invoking methods on unexported embedded fields
Given:

    type u struct{}
    func (u) M() {}

    type t struct { u; u2 u }

    var v = reflect.ValueOf(t{})

Package reflect allows:

    v.Method(0)          // v.M
    v.Field(0).Method(0) // v.u.M

but panics from:

    v.Field(1).Method(0) // v.u2.M

because u2 is not an exported field. However, u is not an exported
field either, so this is inconsistent.

It seems like this behavior originates from #12367, where it was
decided to allow traversing unexported embedded fields to be able to
access their exported fields, since package reflect doesn't provide an
alternative way to access promoted fields directly.

But extending that logic to promoted *methods* was inappropriate,
because package reflect's normal method handling logic already handles
promoted methods correctly. This CL corrects that mistake.

Fixes #38521.

Change-Id: If65008965f35927b4e7927cddf8614695288eb19
Reviewed-on: https://go-review.googlesource.com/c/go/+/228902
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2020-04-21 05:41:33 +00:00
Josh Bleecher Snyder
9255163091 Revert "cmd/compile: use cheaper implementation of oneBit"
This reverts commit 066c47ca5f.

Reason for revert: This appears to have broken a bunch of builders.

Change-Id: I68b4decf3c1892766e195d8eb018844cdff69443
Reviewed-on: https://go-review.googlesource.com/c/go/+/229177
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
2020-04-21 04:28:59 +00:00
Ian Lance Taylor
f6b30e53bb reflect: return user-visible method name in panic string
This was accidentally broken in CL 166462, which introduce another
function in the panicking path without adjusting the argument to
runtime.Caller.

Change-Id: Ib6f9ed8673fefd458c7a4e3a918c45c5b31ca552
Reviewed-on: https://go-review.googlesource.com/c/go/+/229082
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-04-21 04:14:15 +00:00
Cuong Manh Le
7f8fda3c0b cmd/compile: use proper magnitude for (x>>c) & uppermask = 0
This is followup of CL 228860, which rewrite shift rules to use typed
aux. That CL introduced nlz* functions, to refactor left shift rules.
While at it, we realize there's a bug in old rules with both right/left
shift rules, but only fix for left shift rules only.

This CL fixes the bug for right shift rules.

Passes toolstash-check.

Change-Id: Id8f2158b1b66c9e87f3fdeaa7ae3e35dc0666f8b
Reviewed-on: https://go-review.googlesource.com/c/go/+/229137
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
2020-04-21 03:45:26 +00:00
Cuong Manh Le
0f14c2a042 cmd/compile: rewrite shift rules to use typed aux fields
Passes toolstash-check.

Change-Id: I02e78591fe46e19a43dc36913baef0338a014a3d
Reviewed-on: https://go-review.googlesource.com/c/go/+/228860
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2020-04-21 03:13:22 +00:00
Brad Fitzpatrick
366460defb A: add Tailscale Inc. (Corporate CLA)
Change-Id: Ic95f6f78fa56169998a6890beb873693852c5798
Reviewed-on: https://go-review.googlesource.com/c/go/+/228419
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2020-04-21 01:41:37 +00:00
Josh Bleecher Snyder
066c47ca5f cmd/compile: use cheaper implementation of oneBit
Updates #38547

file    before    after     Δ       %       
compile 19678112  19669808  -8304   -0.042% 
total   113143160 113134856 -8304   -0.007% 

Change-Id: I5f8afe17401dbdb7c7b3d66d95fe40821c499a92
Reviewed-on: https://go-review.googlesource.com/c/go/+/229127
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2020-04-21 00:38:53 +00:00
Josh Bleecher Snyder
50b11318fe cmd/compile: use oneBit instead of isPowerOfTwo in bit optimization
This optimization works on any integer with exactly one bit set.
This is identical to being a power of two, except in the
most negative number. Use oneBit instead.

The rule now triggers in a few more places in std+cmd,
in packages encoding/asn1, crypto/elliptic, and
vendor/golang.org/x/crypto/cryptobyte.

This change obviates the need for CL 222479
by doing this optimization consistently in the compiler.

Change-Id: I983c6235290fdc634fda5e11b10f1f8ce041272f
Reviewed-on: https://go-review.googlesource.com/c/go/+/229124
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2020-04-21 00:38:34 +00:00
Josh Bleecher Snyder
12665b9a06 cmd/compile: convert two generic rules to be typed
Prelude to changing the rules.

Passes toolstash-check.

Change-Id: I22fead7f74d2cf97bb3fbeb22741125b42914c43
Reviewed-on: https://go-review.googlesource.com/c/go/+/229123
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2020-04-21 00:38:14 +00:00
Robert Griesemer
eec981e622 go/types: remove duplicate assert call (minor cleanup)
Change-Id: I6051b3305f8ee02bec4ff3dc7ec2217daed38d72
Reviewed-on: https://go-review.googlesource.com/c/go/+/228903
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2020-04-21 00:09:00 +00:00
David Finkel
1cca496c5e Revert "Revert "cmd/compile: adjust RISCV64 rewrite rules to use typed aux fields""
This reverts commit 98c32670fd454939794504225dca1d4ec55045d5.

Rolling-forward with trivial format-string fix

cmd/compile: adjust RISCV64 rewrite rules to use typed aux fields

Also add a typed version of mergeSym to rewrite.go to assist with a few
rules that used mergeSym in the untyped-form.

Remove a few extra int32 overflow checks that no longer make sense, as
adding two int8s or int16s should never overflow an int32.

Passes toolstash-check -all.

Original review: https://go-review.googlesource.com/c/go/+/228882

Change-Id: Ib63db4ee1687446f0f3d9f11575a40dd85cbce55
Reviewed-on: https://go-review.googlesource.com/c/go/+/229126
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
2020-04-20 23:30:29 +00:00
David Carter
f38fad4aaa cmd/cover: add <title> tag to <head> for coverage report HTML template
Adds a missing <title> tag to the HTML template to make it
more compliant as <title> tags are generally required for valid
HTML documents.

Change-Id: I1ab2a6ee221c8a79d3cc13d9ac6110f6f4963914
GitHub-Last-Rev: 6d519dc9dd
GitHub-Pull-Request: golang/go#38313
Reviewed-on: https://go-review.googlesource.com/c/go/+/227547
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2020-04-20 22:48:51 +00:00
Ian Lance Taylor
2edd351b92 runtime: skip TestBigGOMAXPROCS if it runs out of memory
Fixes #38541

Change-Id: I0e9ea5865628d953c32f3a5d4b3ccf1c1d0b081e
Reviewed-on: https://go-review.googlesource.com/c/go/+/229077
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2020-04-20 22:42:49 +00:00
Than McIntosh
0cffc95109 Revert "cmd/compile: adjust RISCV64 rewrite rules to use typed aux fields"
This reverts commit 7004be998b.

Reason for revert: causing failures on many builders

Change-Id: I9216bd5409bb6814bac18a6a13ef5115db01b5fe
Reviewed-on: https://go-review.googlesource.com/c/go/+/229120
Run-TryBot: Than McIntosh <thanm@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2020-04-20 22:38:59 +00:00
Bryan C. Mills
75e79adaf9 cmd/api: limit concurrent 'go list' calls to GOMAXPROCS
Each invocation of 'go list' may consume a significant quantity of
system resources, including buffers for reading files and RAM for the
runtime's memory footprint.
Very small builders may even hit swap as a result of that load,
further exacerbating resource contention.

To avoid overloading small builders, restrict 'go list' calls to
runtime.GOMAXPROCS as it is set at the first call to loadImports.

This also somewhat improves running time even on larger machines: on
my workstation, this change reduces the wall time for 'go test
cmd/api' by around 100ms.

Updates #38537

Change-Id: I968e0f961a8f1d84c27e1ab8b621b9670dcfd448
Reviewed-on: https://go-review.googlesource.com/c/go/+/228998
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2020-04-20 21:23:00 +00:00
Brad Fitzpatrick
40a144b94f crypto/tls: add Dialer
Fixes #18482

Change-Id: I99d65dc5d824c00093ea61e7445fc121314af87f
Reviewed-on: https://go-review.googlesource.com/c/go/+/214977
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2020-04-20 20:33:36 +00:00
David Finkel
7004be998b cmd/compile: adjust RISCV64 rewrite rules to use typed aux fields
Also add a typed version of mergeSym to rewrite.go to assist with a few
rules that used mergeSym in the untyped-form.

Remove a few extra int32 overflow checks that no longer make sense, as
adding two int8s or int16s should never overflow an int32.

Passes toolstash-check -all.

Change-Id: I72ddd2b0d9001faa87ad0ab54f500057164661b7
Reviewed-on: https://go-review.googlesource.com/c/go/+/228882
Reviewed-by: Keith Randall <khr@golang.org>
2020-04-20 20:22:51 +00:00
Josh Bleecher Snyder
0239a5c478 cmd/compile: use fuse to implement shortcircuit loop
The rewrite loop in shortcircuit is identical to the one in fuse.
That's not surprising; shortcircuit is fuse-like.

Take advantage of that by merging the two loops.

Passes toolstash-check.

Change-Id: I642cb39a23d2ac8964ed577678f062fce721439c
Reviewed-on: https://go-review.googlesource.com/c/go/+/229003
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2020-04-20 19:36:50 +00:00
Than McIntosh
5cccd7a724 [dev.link] cmd/link: refactor symbol to section assignment in allocateSections
Create a couple of helper routines to aid in assigning symbols to
sections in dodata's allocateSections, then replace loops over symbol
lists with calls to the helpers, to reduce the amount of duplicate
code.

This patch also decouples gcprog/gcdata generation from
symbol-to-section assignment (previously intertwined), as an aid to
making the code less complicated.

No change in functionality.

Change-Id: If126579486bce458f697e32bad556df453df53e9
Reviewed-on: https://go-review.googlesource.com/c/go/+/228781
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
2020-04-20 19:26:32 +00:00
Than McIntosh
c32b590264 [dev.link] cmd/link: revise representation of dwarfp
Change linker DWARF generation to move away from emitting a single
giant list of DWARF symbols, and instead emit a list of descriptors,
with each descriptor holding the symbols for a specific DWARF section.

While placing all DWARF symbols in a single lists does come in handy
in certain instances, it also creates a lot of confusion and weird
code in other cases, specifically where we want to perform operations
on a section-by-section basis (resulting in code that tries to
re-discover section boundaries by walking/inspecting the list).

Change-Id: I4dac81bd38cba903c9fd7004d613597e76dfb77a
Reviewed-on: https://go-review.googlesource.com/c/go/+/228780
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
2020-04-20 19:25:18 +00:00
Than McIntosh
817bd10cae [dev.link] cmd/link: continue refactoring dodata
Move more items into the dodata state object (including the "datsize"
variable used in allocateSections) and the Link ctxt pointer), so as
to prepare for follow-on refactorings. No change in functionality.

Change-Id: Ie2b1651c1ac9b89deb3f7692227dcd931240afa9
Reviewed-on: https://go-review.googlesource.com/c/go/+/228779
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
2020-04-20 19:19:20 +00:00
Daniel Theophanes
c9af5523f3 database/sql: on Tx rollback, retain connection if driver can reset session
Previously the Tx would drop the connection after rolling back from
a context cancel. Now if the driver can reset the session,
keep the connection.

Change-Id: Ie6a3124275632787629844d91a06bb2e70cc060b
Reviewed-on: https://go-review.googlesource.com/c/go/+/216241
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2020-04-20 18:47:26 +00:00
Jeremy Faller
8ab37b1baf [dev.link] cmd/link: fallocate space, and remove all msync calls
The fallocate calls will lower the chances of SIGBUS in the linker, but
it might still happen on other unsupported platforms and filesystems.

Darwin cmd/compile stats:

Munmap                    16.0ms ± 8%     0.8ms ± 3%   -95.19%  (p=0.000 n=8+10)
TotalTime                  484ms ± 2%     462ms ± 2%    -4.52%  (p=0.000 n=10+9)

Updates #37310

Change-Id: I41c6e490adec26fa1ebee49a5b268828f5ba05e1
Reviewed-on: https://go-review.googlesource.com/c/go/+/228385
Run-TryBot: Jeremy Faller <jeremy@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
2020-04-20 18:32:58 +00:00
Jeremy Faller
7d4c455a80 [dev.link] cmd/link: rename deadcode2 to deadcode
deadcode's been completely replaced. Make its death official.

Change-Id: I85f1e3968463f216b8bce2fb7217c3b51641939f
Reviewed-on: https://go-review.googlesource.com/c/go/+/229002
Run-TryBot: Jeremy Faller <jeremy@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
2020-04-20 18:29:24 +00:00
Cherry Zhang
6290a54365 [dev.link] cmd/link: don't write text address directly if using plugins
When using plugins, on darwin we do weird things with
runtime.etext symbol, assigning a value for it, then clear it,
reassign a different value. This breaks the logic of writing text
address directly.

I think we should remove the weird thing with runtime.etext, if
possible. But for now, disable the optimization (this is not a
common case anyway).

Fix darwin-nocgo build.

Change-Id: Iab6a9f8519115226a5bbaaafe4a93f17042a928a
Reviewed-on: https://go-review.googlesource.com/c/go/+/229057
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
2020-04-20 18:26:46 +00:00
Daniel Theophanes
d8f0a229b5 database/sql: prevent Tx statement from committing after rollback
It was possible for a Tx that was aborted for rollback
asynchronously to execute a query after the rollback had completed
on the database, which often would auto commit the query outside
of the transaction.

By W-locking the tx.closemu prior to issuing the rollback
connection it ensures any Tx query either fails or finishes
on the Tx, and never after the Tx has rolled back.

Fixes #34775
Fixes #32942

Change-Id: I017b7932082f2f4ead70bae08b61ed9068ac1d01
Reviewed-on: https://go-review.googlesource.com/c/go/+/216240
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
2020-04-20 17:45:50 +00:00
Daniel Theophanes
b2cff7e091 database/sql: check conn expiry when returning to pool, not when handing it out
With the original connection reuse strategy, it was possible that
when a new connection was requested, the pool would wait for an
an existing connection to return for re-use in a full connection
pool, and then it would check if the returned connection was expired.
If the returned connection expired while awaiting re-use, it would
return an error to the location requestiong the new connection.
The existing call sites requesting a new connection was often the last
attempt at returning a connection for a query. This would then
result in a failed query.

This change ensures that we perform the expiry check right
before a connection is inserted back in to the connection pool
for while requesting a new connection. If requesting a new connection
it will no longer fail due to the connection expiring.

Fixes #32530

Change-Id: If16379befe0e14d90160219c0c9396243fe062f7
Reviewed-on: https://go-review.googlesource.com/c/go/+/216197
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
2020-04-20 17:41:27 +00:00
Josh Bleecher Snyder
f8ff12d480 cmd/compile: use dereference boundedness hint in ssa.addr
Follow-up to (and similar to) CL 228885.
Triggers a handful of times in std+cmd.

Change-Id: Ie04057ca3974ef9eef669335e326a5ed4b7472cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/228999
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2020-04-20 17:27:11 +00:00
Cherry Zhang
dce26bdbc1 [dev.link] cmd/oldlink: update with recent linker changes
Port CL 228792, CL 228877, and CL 228881 to old linker.

Change-Id: Id3fdc413a9f7b38887ae8cc7bca5904933be93de
Reviewed-on: https://go-review.googlesource.com/c/go/+/229001
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
2020-04-20 16:51:00 +00:00
Josh Bleecher Snyder
4e550bdacd cmd/compile: simplify state.addr
OADDR nodes can't be bounded.
All calls to state.addr thus pass false.
Remove the argument.

Passes toolstash-check.

Change-Id: I9a3fcf37f63b2b5094e043d39ab3b857b5090e91
Reviewed-on: https://go-review.googlesource.com/c/go/+/228788
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-04-20 16:38:31 +00:00