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46879 Commits

Author SHA1 Message Date
Robert Griesemer
810957b155 [dev.typeparams] cmd/compile/internal/types2: adjusted array error message for compiler
Also: Triaged/adjusted some more test/fixedbugs tests.
Change-Id: Idaba1875273d6da6ef82dd8de8edd8daa885d32c
Reviewed-on: https://go-review.googlesource.com/c/go/+/276472
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
2020-12-09 23:54:59 +00:00
Rob Findley
89f465c2b5 go/types: avoid endless recursion in the Comparable predicate
This is a port of CL 276374 from the dev.typeparams branch. Avoid an
endless recursion in Comparable by tracking types that have already been
considered.

Fixes #43088

Change-Id: I927b29ac544df9bfb5c8c04699d57fafe6cfff73
Reviewed-on: https://go-review.googlesource.com/c/go/+/276552
Run-TryBot: Robert Findley <rfindley@google.com>
Trust: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2020-12-09 21:05:24 +00:00
Russ Cox
f1980efb92 all: update to use os.ReadDir where appropriate
os.ReadDir is a replacement for ioutil.ReadDir that returns
a slice of fs.DirEntry instead of fs.FileInfo, meaning it is the
more efficient form.

This CL updates call sites throughout the Go source tree
wherever possible. As usual, code built using the Go 1.4
bootstrap toolchain is not included. There is also a use in
go/build that appears in the public API and can't be changed,
at least not without additional changes.

Fixes #42026.

Change-Id: Icfc9dd52c6045020f6830e22c72128499462d561
Reviewed-on: https://go-review.googlesource.com/c/go/+/266366
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2020-12-09 19:12:27 +00:00
Russ Cox
4f1b0a44cb all: update to use os.ReadFile, os.WriteFile, os.CreateTemp, os.MkdirTemp
As part of #42026, these helpers from io/ioutil were moved to os.
(ioutil.TempFile and TempDir became os.CreateTemp and MkdirTemp.)

Update the Go tree to use the preferred names.

As usual, code compiled with the Go 1.4 bootstrap toolchain
and code vendored from other sources is excluded.

ReadDir changes are in a separate CL, because they are not a
simple search and replace.

For #42026.

Change-Id: If318df0216d57e95ea0c4093b89f65e5b0ababb3
Reviewed-on: https://go-review.googlesource.com/c/go/+/266365
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2020-12-09 19:12:23 +00:00
Matthew Dempsky
63bc23b545 [dev.regabi] cmd/compile: first start towards using Ident
This CL adds Ident, which will eventually replace *Name and *PkgName
within the AST for representing uses of declared names. (Originally, I
intended to call it "IdentExpr", but neither go/ast nor
cmd/compile/internal/syntax include the "Expr" suffix for their
respective types.)

To start, this CL converts two uses of *Name to *Ident: the tag
identifier in a TypeSwitchGuard (which doesn't actually declare a
variable by itself), and the not-yet-known placeholder ONONAME
returned by oldname to stand-in for identifiers that might be declared
later in the package.

The TypeSwitchGuard's Name's Used flag was previously used for
detecting whether none of the per-clause variables were used. To avoid
bloating all Idents for this rare use, a "Used" bool is added to
TypeSwitchGuard instead. Eventually it could maybe be packed into
miniNode.bits, but for now this is good enough.

Passes buildall w/ toolstash -cmp.

Change-Id: I393284d86757cbbebd26e1320c7354e2bdcb30b0
Reviewed-on: https://go-review.googlesource.com/c/go/+/276113
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
2020-12-09 17:17:53 +00:00
Matthew Dempsky
eae8fd519b [dev.regabi] cmd/compile: iexport debug crumbs for toolstash
Prints offsets for declarations, inline bodies, and strings when -v is
used. Still not much, but hopefully useful for narrowing down the
cause of export data differences.

Change-Id: I9b2e4a3d55b92823fa45a39923e8c4b25303693c
Reviewed-on: https://go-review.googlesource.com/c/go/+/276112
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
2020-12-09 17:17:31 +00:00
Russ Cox
837b35cc55 [dev.regabi] cmd/compile: adjust IR representations
Based on actually using the IR when prototyping adding
type assertions, a few changes to improve it:

- Merge DeferStmt and GoStmt, since they are variants of one thing.
- Introduce LogicalExpr for && and ||, since they (alone) need an init list before Y.
- Add an explicit op to various constructors to make them easier to use.
- Add separate StructKeyExpr - it stores Value in a different abstract location (Left) than KeyExpr (Right).
- Export all fields for use by rewrites (and later reflection).

Passes buildall w/ toolstash -cmp.

Change-Id: Iefbff2386d2bb9ef511ce53b7f92ff6c709dc991
Reviewed-on: https://go-review.googlesource.com/c/go/+/275883
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-12-09 17:05:32 +00:00
Russ Cox
0c49440664 [dev.regabi] cmd/compile: arrange for walkstmt, walkexpr, to return from switch cases
Ending them in a returning switch makes it safe for each case
to do an appropriate type assertion.

Passes buildall w/ toolstash -cmp.

Change-Id: I55d8f0a555006104164d84d27822aa8c5ad68515
Reviewed-on: https://go-review.googlesource.com/c/go/+/275882
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-12-09 17:05:19 +00:00
Russ Cox
4090af83c5 [dev.regabi] cmd/compile: use reflection in ir.Dump
ir.Dump is the final (I think!) piece of the compiler that was walking
nodes using Left, Right etc without knowing what they meant.
This CL uses reflection to walk nodes without knowing what they mean instead.
One benefit is that we can print actual meanings (field names).

While we are here, I could not resist fixing a long-standing mental TODO:
make the line number more clearly a line number. I've forgotten where the
line number is in the dumps far too many times in the last decade.

As a small example, here is a fragment of go tool compile -W test/235.go:

.   FOR l(28) tc(1)
.   .   LT-init
.   .   .   AS l(28) tc(1)
.   .   .   .   NAME-main..autotmp_4 l(28) x(0) class(PAUTO) esc(N) tc(1) assigned used int
.   .   .   .   LEN l(28) tc(1) int
.   .   .   .   .   NAME-main.xs g(2) l(26) x(0) class(PPARAM) esc(no) tc(1) used SLICE-[]uint64
.   .   LT l(28) tc(1) hascall bool
.   .   .   NAME-main.i g(4) l(28) x(0) class(PAUTO) esc(no) tc(1) assigned used int
.   .   .   NAME-main..autotmp_4 l(28) x(0) class(PAUTO) esc(N) tc(1) assigned used int
.   .   BLOCK l(28)
.   .   BLOCK-list
.   .   .   ASOP-ADD l(28) tc(1) implicit(true) int
.   .   .   .   NAME-main.i g(4) l(28) x(0) class(PAUTO) esc(no) tc(1) assigned used int
.   .   .   .   LITERAL-1 l(28) tc(1) int
.   FOR-body
.   .   VARKILL l(28) tc(1)
.   .   .   NAME-main..autotmp_4 l(28) x(0) class(PAUTO) esc(N) tc(1) assigned used int
.   .   IF l(29) tc(1)
.   .   .   LT l(29) tc(1) bool
.   .   .   .   INDEX l(29) tc(1) uint64
.   .   .   .   .   NAME-main.xs g(2) l(26) x(0) class(PPARAM) esc(no) tc(1) used SLICE-[]uint64
.   .   .   .   .   NAME-main.i g(4) l(28) x(0) class(PAUTO) esc(no) tc(1) assigned used int
.   .   .   .   NAME-main.m g(3) l(27) x(0) class(PAUTO) esc(no) tc(1) assigned used uint64
.   .   IF-body
.   .   .   AS l(30) tc(1)
.   .   .   .   NAME-main.m g(3) l(27) x(0) class(PAUTO) esc(no) tc(1) assigned used uint64
.   .   .   .   INDEX l(30) tc(1) uint64
.   .   .   .   .   NAME-main.xs g(2) l(26) x(0) class(PPARAM) esc(no) tc(1) used SLICE-[]uint64
.   .   .   .   .   NAME-main.i g(4) l(28) x(0) class(PAUTO) esc(no) tc(1) assigned used int

and here it is after this CL:

.   FOR tc(1) # 235.go:28
.   FOR-Cond
.   .   LT-init
.   .   .   AS tc(1) # 235.go:28
.   .   .   .   NAME-main..autotmp_4 x(0) class(PAUTO) esc(N) tc(1) assigned used int # 235.go:28
.   .   .   .   LEN tc(1) int # 235.go:28 int
.   .   .   .   .   NAME-main.xs g(2) x(0) class(PPARAM) esc(no) tc(1) used SLICE-[]uint64 # 235.go:26
.   .   LT tc(1) hascall bool # 235.go:28 bool
.   .   .   NAME-main.i g(4) x(0) class(PAUTO) esc(no) tc(1) assigned used int # 235.go:28
.   .   .   NAME-main..autotmp_4 x(0) class(PAUTO) esc(N) tc(1) assigned used int # 235.go:28
.   FOR-Post
.   .   BLOCK # 235.go:28
.   .   BLOCK-List
.   .   .   ASOP-ADD tc(1) implicit(true) int # 235.go:28 int
.   .   .   .   NAME-main.i g(4) x(0) class(PAUTO) esc(no) tc(1) assigned used int # 235.go:28
.   .   .   .   LITERAL-1 tc(1) int # 235.go:28
.   FOR-Body
.   .   VARKILL tc(1) # 235.go:28
.   .   .   NAME-main..autotmp_4 x(0) class(PAUTO) esc(N) tc(1) assigned used int # 235.go:28
.   .   IF tc(1) # 235.go:29
.   .   IF-Cond
.   .   .   LT tc(1) bool # 235.go:29 bool
.   .   .   .   INDEX tc(1) uint64 # 235.go:29 uint64
.   .   .   .   .   NAME-main.xs g(2) x(0) class(PPARAM) esc(no) tc(1) used SLICE-[]uint64 # 235.go:26
.   .   .   .   .   NAME-main.i g(4) x(0) class(PAUTO) esc(no) tc(1) assigned used int # 235.go:28
.   .   .   .   NAME-main.m g(3) x(0) class(PAUTO) esc(no) tc(1) assigned used uint64 # 235.go:27
.   .   IF-Body
.   .   .   AS tc(1) # 235.go:30
.   .   .   .   NAME-main.m g(3) x(0) class(PAUTO) esc(no) tc(1) assigned used uint64 # 235.go:27
.   .   .   .   INDEX tc(1) uint64 # 235.go:30 uint64
.   .   .   .   .   NAME-main.xs g(2) x(0) class(PPARAM) esc(no) tc(1) used SLICE-[]uint64 # 235.go:26
.   .   .   .   .   NAME-main.i g(4) x(0) class(PAUTO) esc(no) tc(1) assigned used int # 235.go:28

Note in particular the clear marking of FOR-Cond, FOR-Post, FOR-Body compared to the original.

The only changes to a few test files are the improved field name lines, and of course the line numbers.

Passes buildall w/ toolstash -cmp.

Change-Id: I5b654d9d8ee898976d4c387742ea688a082bac78
Reviewed-on: https://go-review.googlesource.com/c/go/+/275785
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-12-09 17:05:13 +00:00
Russ Cox
e2d278bfeb [dev.regabi] cmd/compile: two small fixes
Addressing comments from CL 275434 and CL 275444.
I forgot to run "git rw" to rebase the fixup CLs down before
running "git submit".

Change-Id: Ideaa2340a81511491c096555c6834cd9bdb267d8
Reviewed-on: https://go-review.googlesource.com/c/go/+/275881
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-12-09 17:04:54 +00:00
Dmitri Shuralyov
5627a4dc30 runtime/metrics: simplify test to support more environments
go test sets the working directory to that of the package being tested,
so opening one of the package source files can be done in a simpler way.
This also allows the test to run in more environments, for example when
GOROOT_FINAL¹ is set.

Also remove the testenv.HasSrc-like check for Go source. The doc.go
file is a part of the package being built and tested, so it's expected
to be available. If it's important for this test to handle when a test
binary is built with go test -c and executed elsewhere without package
source files, something more than testenv.HasSrc would be needed.

¹ https://golang.org/cmd/go/#hdr-Environment_variables

Fixes #43085.

Change-Id: Ie6ade395a8fc7beebdadbad6f4873800138dfc26
Reviewed-on: https://go-review.googlesource.com/c/go/+/276452
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
2020-12-09 16:57:37 +00:00
Robert Griesemer
c32566c336 [dev.typeparams] cmd/compile/internal/types2: avoid endless recursion in Comparable predicate
Use a map to detect recursive types.
With this we can now typecheck fixedbugs/issue8501.go.

Updates #43088.

Change-Id: I7fad6ccf6c94268473ff72b09a3158e13a7f4cc3
Reviewed-on: https://go-review.googlesource.com/c/go/+/276374
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
2020-12-09 16:56:16 +00:00
Ikko Ashimine
db6032dd0c cmd/compile: fix message typo
occurences -> occurrences

Change-Id: Ia81671f5de8a24ddd303a77b4580e8c726f29122
GitHub-Last-Rev: 11f9ab9f8c
GitHub-Pull-Request: golang/go#43097
Reviewed-on: https://go-review.googlesource.com/c/go/+/276612
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2020-12-09 16:38:26 +00:00
Michael Fraenkel
854a2f8e01 net/http: add connections back that haven't been canceled
Issue #41600 fixed the issue when a second request canceled a connection
while the first request was still in roundTrip.
This uncovered a second issue where a request was being canceled (in
roundtrip) but the connection was put back into the idle pool for a
subsequent request.
The fix is the similar except its now in readLoop instead of roundTrip.
A persistent connection is only added back if it successfully removed
the cancel function; otherwise we know the roundTrip has started
cancelRequest.

Fixes #42942

Change-Id: Ia56add20880ccd0c1ab812d380d8628e45f6f44c
Reviewed-on: https://go-review.googlesource.com/c/go/+/274973
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Trust: Damien Neil <dneil@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
2020-12-09 03:06:41 +00:00
Haoran Luo
6fa06d960b runtime: prevent stack growth after fork in runtime.sigfillset
This fixes the unexpected growth of stack in child process, which
is caused by stack checking code in runtime.sigfillset called from
runtime.sigset while clearing the signal handlers in child process.

The redundant stack checking code is generated due to missing
'//go:nosplit' directive that should be annotated for
runtime.sigfillset.

Fixes #43066
Updates #21314

Change-Id: I9483a962a4b0747074313991841e2440ee32198c
Reviewed-on: https://go-review.googlesource.com/c/go/+/276173
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Austin Clements <austin@google.com>
2020-12-09 03:01:58 +00:00
Keith Randall
ae9b442df2 doc: add description of new framepointer vet check
Update #43014

Change-Id: I5fbfaa16e6acb8859fd0b1188f532f5a225f6349
Reviewed-on: https://go-review.googlesource.com/c/go/+/276373
Trust: Keith Randall <khr@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
2020-12-09 01:34:53 +00:00
Keith Randall
31496cfde5 cmd/vet: vendor in x/tools, enable framepointer vet check
Vendor in latest x/tools.
Add framepointer vet check to vet.

Fixes #43014

Change-Id: Ife72f85b1261aa60c0028041c58040d60a40918a
Reviewed-on: https://go-review.googlesource.com/c/go/+/276372
Trust: Keith Randall <khr@golang.org>
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Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
2020-12-08 22:58:14 +00:00
Rob Findley
6015c4e543 [dev.typeparams] go/*: add TODOs from CLs importing dev.go2go changes
With the plurality of CLs importing dev.go2go changes it's getting hard
to track all of the code review comments that were deferred for later
consideration. Add some TODOs to capture these comments in the source,
so that they may be more easily located.

Change-Id: I5caf085fec11ca8992b7affe6feb0a7aa202f21f
Reviewed-on: https://go-review.googlesource.com/c/go/+/276254
Trust: Robert Findley <rfindley@google.com>
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Reviewed-by: Robert Griesemer <gri@golang.org>
2020-12-08 22:00:26 +00:00
Rob Findley
01b76d5fbc go/types: correct error position for inherited const init expressions
This is a port of CL 275517 from the dev.typeparams branch, to fix the
positioning of error messages for invalid const init expressions that
are inherited.

Differences from CL 275517:
 + The inherited flag is added to the constDecl intermediate
   representation.
 + The errpos override is made a positioner, the internal interface
   used by go/types to capture error position and span. For const decls
   errpos is just set to a singular point, but using positioner is
   correct and causes span start and end positions to also be
   overridden.
 + Test cases are updated to assert on just 'overflows', as the go/types
   error message is, for example, "cannot use 255 + iota (untyped int
   constant 256) as byte value in constant declaration (overflows)".
   This is more verbose than the compiler's "constant 256 overflows
   byte", but changing that is out of scope.

Fixes #42991

Change-Id: I0a71d2290f7fff5513f2a6e49b83e6f0f4da30e5
Reviewed-on: https://go-review.googlesource.com/c/go/+/276172
Run-TryBot: Robert Findley <rfindley@google.com>
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Trust: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
2020-12-08 19:45:23 +00:00
Rob Findley
b6e678573d [dev.typeparams] go/types: import universe changes from dev.go2go
This is unmodified from the dev.go2go branch, except to remove the aType
embedding.

Change-Id: Id14d97a56d27ea609c43b453e8f9f1cf1a451406
Reviewed-on: https://go-review.googlesource.com/c/go/+/276252
Trust: Robert Findley <rfindley@google.com>
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Reviewed-by: Robert Griesemer <gri@golang.org>
2020-12-08 17:21:49 +00:00
Austin Clements
48d6275952 doc/go1.16: improve channel race detector changes description
Based on text from Daniel Fava.

For #40700.

Change-Id: I0bc3a4340b8a777ff96d3cf226a7d51d3f65db2c
Reviewed-on: https://go-review.googlesource.com/c/go/+/275786
Trust: Austin Clements <austin@google.com>
Reviewed-by: Daniel Fava <danielsfava@gmail.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
2020-12-08 15:58:23 +00:00
Rob Findley
14dc2d2345 [dev.typeparams] go/types: import the Type API from dev.go2go
Import the Type changes from the dev.go2go branch, as well as a minimal
set of related changes to the Checker code so that tests pass. This
involved making some decisions about which functionality to import, with
some parts of the Type API (for example instance.expand) carved out as
they pulled in too many additional changes.

Minimal changes were made from the dev.go2go version. Notably:
 + The aType helper struct is removed. It could have been removed in CL
   274852 but was missed.
 + writeTParamList was cleaned up for the bracketed parameter style.
 + Some interface iteration functions were simplified.

One observation along the way is that, especially with converter methods
removed from the Type interface, we should probably avoid storing the
Checker on Type instances for lazy evaluation. If a function is only
valid during a checking pass, we should make it a method on Checker
instead of a method on the Type instance. Rather than do this now, which
would make later changes harder to import, I left a couple TODOs to
address this later.

Change-Id: Ie669224614269874474d87e46c68216cb06b6d0e
Reviewed-on: https://go-review.googlesource.com/c/go/+/275441
Reviewed-by: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Robert Findley <rfindley@google.com>
2020-12-08 15:21:40 +00:00
Matthew Dempsky
dbf2fc8cff [dev.regabi] cmd/compile: replace many uses of ir.Node with *ir.Name
This commit adds exactly two "n := n.(*ir.Name)" statements, that are
each immediately preceded by a "case ir.ONAME:" clause in an n.Op()
switch. The rest of the changes are simply replacing "ir.Node" to
"*ir.Name" and removing now unnecessary "n.(*ir.Name)" type
assertions, exposing the latent typing details.

Passes buildall w/ toolstash -cmp.

Updates #42982.

Change-Id: I8ea3bbb7ddf0c7192245cafa49a19c0e7a556a39
Reviewed-on: https://go-review.googlesource.com/c/go/+/275791
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Trust: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Russ Cox <rsc@golang.org>
2020-12-08 01:47:13 +00:00
Matthew Dempsky
bb31c75343 [dev.regabi] cmd/compile: ir.Node is no longer an ssa.Aux
After the previous rewrite, we can now remove CanBeAnSSASym and
CanBeAnSSAAux from the generic Node interface, and declare them just
on *ir.Name.

Updates #42982.

Change-Id: I865771fd30c95c009740410844f20ade08648343
Reviewed-on: https://go-review.googlesource.com/c/go/+/275790
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Russ Cox <rsc@golang.org>
2020-12-08 01:47:04 +00:00
Matthew Dempsky
6db970e20a [dev.regabi] cmd/compile: rewrite Aux uses of ir.Node to *ir.Name [generated]
Now that the only remaining ir.Node implementation that is stored
(directly) into ssa.Aux, we can rewrite all of the conversions between
ir.Node and ssa.Aux to use *ir.Name instead.

rf doesn't have a way to rewrite the type switch case clauses, so we
just use sed instead. There's only a handful, and they're the only
times that "case ir.Node" appears anyway.

The next CL will move the tag method declarations so that ir.Node no
longer implements ssa.Aux.

Passes buildall w/ toolstash -cmp.

Updates #42982.

[git-generate]
cd src/cmd/compile/internal
sed -i -e 's/case ir.Node/case *ir.Name/' gc/plive.go */ssa.go

cd ssa
rf '
ex . ../gc {
  import "cmd/compile/internal/ir"

  var v *Value
  v.Aux.(ir.Node) -> v.Aux.(*ir.Name)

  var n ir.Node
  var asAux func(Aux)
  strict n        # only match ir.Node-typed expressions; not *ir.Name
  implicit asAux  # match implicit assignments to ssa.Aux
  asAux(n)        -> n.(*ir.Name)
}
'

Change-Id: I3206ef5f12a7cfa37c5fecc67a1ca02ea4d52b32
Reviewed-on: https://go-review.googlesource.com/c/go/+/275789
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
2020-12-08 01:46:57 +00:00
Matthew Dempsky
1c8943a6ad [dev.regabi] cmd/compile: introduce FwdRefAux for wrapping ir.Node as ssa.Aux
OpFwdRef is the only SSA value that needs the ability to store an
arbitrary ir.Node in its Aux field. Every other SSA value always uses
an *ir.Name.

This CL introduces FwdRefAux, which wraps an ir.Node and implements
the ssa.Aux tag interface, so that a subsequent refactoring can change
ir.Node to not implement ssa.Aux.

Passes buildall w/ toolstash -cmp.

Updates #42982.

Change-Id: Id1475b28847579573cd376e82f28761d84cd1c23
Reviewed-on: https://go-review.googlesource.com/c/go/+/275788
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
2020-12-08 01:46:48 +00:00
Joel Sing
9c91cab0da runtime: correct sigfwd on openbsd/mips64
Position independent code expects that R25 (aka $t9) contains the address of the
called function. As such, use R25 when calling from sigfwd.

Change-Id: I66b2b9bfa1f1bb983c7385eb2eaa19d9cd87d9fb
Reviewed-on: https://go-review.googlesource.com/c/go/+/275893
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
2020-12-08 01:46:45 +00:00
Matthew Dempsky
dcec658f6c [dev.regabi] cmd/compile: change LocalSlot.N to *ir.Name
This was already documented as always being an ONAME, so it just
needed a few type assertion changes.

Passes buildall w/ toolstash -cmp.

Updates #42982.

Change-Id: I61f4b6ebd57c43b41977f4b37b81fe94fb11a723
Reviewed-on: https://go-review.googlesource.com/c/go/+/275757
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Russ Cox <rsc@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
2020-12-08 01:46:40 +00:00
Matthew Dempsky
1a98ab0e2d [dev.regabi] cmd/compile: add ssa.Aux tag interface for Value.Aux
It's currently hard to automate refactorings around the Value.Aux
field, because we don't have any static typing information for it.
Adding a tag interface will make subsequent CLs easier and safer.

Passes buildall w/ toolstash -cmp.

Updates #42982.

Change-Id: I41ae8e411a66bda3195a0957b60c2fe8a8002893
Reviewed-on: https://go-review.googlesource.com/c/go/+/275756
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
2020-12-08 01:46:31 +00:00
Austin Clements
6362d01c15 doc/go1.16: update linker stats
benchstat v2 comparison vs HEAD:

                    1.15.6                    1.16
                    sec/op       sec/op           vs base
LinkIstio-48        4.44 ± 1%   3.43 ± 1%  -22.79% (p=0.000 n=20)
LinkKubelet-48     10.89 ± 1%   8.42 ± 1%  -22.63% (p=0.000 n=20)
LinkDiscovery-48    1.43 ± 1%   1.06 ± 1%  -25.68% (p=0.000 n=20)
LinkIstio-4         4.50 ± 1%   3.52 ± 1%  -21.84% (p=0.000 n=20)
LinkKubelet-4      10.84 ± 2%   8.55 ± 1%  -21.09% (p=0.000 n=20)
LinkDiscovery-4     1.45 ± 2%   1.11 ± 2%  -23.81% (p=0.000 n=20)

                     1.15.6                      1.16
                  max-RSS-bytes  max-RSS-bytes         vs base
LinkIstio-48       1085Mi ± 1%    1006Mi ± 0%    -7.32% (p=0.000 n=20)
LinkKubelet-48     1.60Gi ± 5%    1.46Gi ± 1%    -8.57% (p=0.000 n=20)
LinkDiscovery-48    392Mi ± 1%     362Mi ± 2%    -7.71% (p=0.000 n=20)
LinkIstio-4        1022Mi ± 6%     958Mi ± 1%    -6.26% (p=0.000 n=20)
LinkKubelet-4      1.63Gi ± 2%    1.44Gi ± 0%   -11.44% (p=0.000 n=20)
LinkDiscovery-4     400Mi ± 0%     353Mi ± 1%   -11.83% (p=0.000 n=20)

                     1.15.6                    1.16
                   exe-bytes     exe-bytes           vs base
LinkIstio-48       97.7Mi ± 0%   93.4Mi ± 0%  -4.38% (p=0.000 n=20)
LinkKubelet-48      129Mi ± 0%    127Mi ± 0%  -1.17% (p=0.000 n=20)
LinkDiscovery-48   31.9Mi ± 0%   29.1Mi ± 0%  -8.67% (p=0.000 n=20)
LinkIstio-4        97.7Mi ± 0%   93.4Mi ± 0%  -4.38% (p=0.000 n=20)
LinkKubelet-4       129Mi ± 0%    127Mi ± 0%  -1.17% (p=0.000 n=20)
LinkDiscovery-4    31.9Mi ± 0%   29.1Mi ± 0%  -8.67% (p=0.000 n=20)

https://perf.golang.org/search?q=upload:20201207.6

For #40700.

Change-Id: I3f7b3e08db4fb7980d2472f15e5fc04503e95ea0
Reviewed-on: https://go-review.googlesource.com/c/go/+/275912
Trust: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
2020-12-07 23:44:44 +00:00
Ian Lance Taylor
9b8c272558 reflect: document multiple keys in struct tags
For #40281
Fixes #42959

Change-Id: Ibc4769fda1592a1373ec720ea30baf319c0a0136
Reviewed-on: https://go-review.googlesource.com/c/go/+/274448
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
2020-12-07 22:16:21 +00:00
Keith Randall
63722da46b [dev.regabi] cmd/compile: fix comment
Russ, is this what you meant?

Change-Id: I27d2847811c6eabd94358e435eb3eb4bc8cfaa9e
Reviewed-on: https://go-review.googlesource.com/c/go/+/275712
Trust: Keith Randall <khr@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
2020-12-07 21:43:46 +00:00
Russ Cox
7ad6596c47 io/fs: fix Sub method error text
Noticed in (and alternative to) CL 275520.

Change-Id: If6c107ee9928dd1910facd4dc66da7234cb91c39
Reviewed-on: https://go-review.googlesource.com/c/go/+/275879
Trust: Russ Cox <rsc@golang.org>
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
2020-12-07 21:01:46 +00:00
Russ Cox
6d783e7440 [dev.regabi] cmd/compile: export all Node fields [generated]
The plan was always to export them once we remove the getters
and setters, but do it a bit early, with _ suffixes as needed, so that
the reflection-based ir.Dump can access the fields.

Passes buildall w/ toolstash -cmp.

[git-generate]
cd src/cmd/compile/internal/ir
rf '
	mv AddStringExpr.list AddStringExpr.List_
	mv BlockStmt.list BlockStmt.List_
	mv CallExpr.body CallExpr.Body_
	mv CaseStmt.list CaseStmt.List_
	mv CaseStmt.body CaseStmt.Body_
	mv ClosureExpr.fn ClosureExpr.Func_
	mv CompLitExpr.list CompLitExpr.List_
	mv ForStmt.body ForStmt.Body_
	mv Func.body Func.Body_
	mv IfStmt.body IfStmt.Body_
	mv InlinedCallExpr.body InlinedCallExpr.Body_
	mv RangeStmt.body RangeStmt.Body_
	mv SliceExpr.list SliceExpr.List_
	mv SliceHeaderExpr.lenCap SliceHeaderExpr.LenCap_
	mv TypeSwitchGuard.name TypeSwitchGuard.Name_
'
go generate

Change-Id: I06e65920cecbcc51bea2254f52fcd7d5c5d0dc90
Reviewed-on: https://go-review.googlesource.com/c/go/+/275784
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-12-07 20:41:43 +00:00
Russ Cox
2de0af3b1b [dev.regabi] cmd/compile: prepare mknode for rename of Func.body
The next CL will rename Func.body to Func.Body_.
At some point in the future we will rename it to Func.Body.
Make the generator not get confused.

Passes buildall w/ toolstash -cmp.

Change-Id: Iee3f4915889a8287377bf3304d5b9250a909477e
Reviewed-on: https://go-review.googlesource.com/c/go/+/275783
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-12-07 20:41:37 +00:00
Russ Cox
724374f859 [dev.regabi] cmd/compile: rewrite stale format strings
On ir.Node, ir.Nodes, and ir.Op, # is ignored, so %#v is %v.
On ir.Node, %S is the same as %v.

On types.Type, # is ignored, so %#L is %L, %#v is %v.
On types.Type, 0 is ignored, so %0S is %S.

Rewrite all these using go test cmd/compile -r, plus a
few multiline formats mentioning %0S on types updated by hand.

Now the formats used in the compiler match the documentation
for the format methods, a minor miracle.

Passes buildall w/ toolstash -cmp.

Change-Id: I3d4a3fae543145a68da13eede91166632c5b1ceb
Reviewed-on: https://go-review.googlesource.com/c/go/+/275782
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-12-07 20:41:29 +00:00
Russ Cox
61889ba680 [dev.regabi] cmd/compile: simplify fmtmap
The format map is going to keep growing as we add more use of
concrete node types. Stop that by reporting all Node implementations
as Node.

Also, there's little point to reporting uses of %v, %p, %T, nor to reporting
formatting of basic types like int and []byte. Remove those too.
(Vet takes care of mistakes involving basic types now.)

Passes buildall w/ toolstash -cmp.

Change-Id: Ia9fb39b401c29bf0c76ffebaa24836c70acd773f
Reviewed-on: https://go-review.googlesource.com/c/go/+/275781
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-12-07 20:41:23 +00:00
Russ Cox
6ea2b8c54c [dev.regabi] cmd/compile: clean up and document formatting
Some cleanup left over from moving the Type and Sym formatting to types.
And then document what the type formats are, now that it's clear.

Passes buildall w/ toolstash -cmp.

Change-Id: I35cb8978f1627db1056cb8ab343ce6ba6c99afad
Reviewed-on: https://go-review.googlesource.com/c/go/+/275780
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-12-07 20:41:17 +00:00
Russ Cox
bb4a37bd93 [dev.regabi] cmd/compile: move Type, Sym printing to package types [generated]
Move the printing of types.Type and types.Sym out of ir
into package types, where it properly belongs. This wasn't
done originally (when the code was in gc) because the Type
and Sym printing was a bit tangled up with the Node printing.
But now they are untangled and can move into the correct
package.

This CL is automatically generated.
A followup CL will clean up a little bit more by hand.

Passes buildall w/ toolstash -cmp.

[git-generate]
cd src/cmd/compile/internal/ir
rf '
	mv FmtMode fmtMode
	mv FErr fmtGo
	mv FDbg fmtDebug
	mv FTypeId fmtTypeID
	mv FTypeIdName fmtTypeIDName
	mv methodSymName SymMethodName

	mv BuiltinPkg LocalPkg BlankSym OrigSym NumImport \
		fmtMode fmtGo symFormat sconv sconv2 symfmt SymMethodName \
		BasicTypeNames fmtBufferPool InstallTypeFormats typeFormat tconv tconv2 fldconv FmtConst \
		typefmt.go

	mv typefmt.go cmd/compile/internal/types
'
cd ../types
mv typefmt.go fmt.go

Change-Id: I6f3fd818323733ab8446f00594937c1628760b27
Reviewed-on: https://go-review.googlesource.com/c/go/+/275779
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-12-07 20:41:11 +00:00
Russ Cox
70155cca81 [dev.regabi] cmd/compile: untangle FmtFlag, FmtMode
It turns out that the FmtFlag is really only tracking the FmtLong and FmtShort bits,
and the others simply mirror the state of the FmtMode and are copied out and
back in repeatedly.

Simplify to FmtFlag being the verb itself ('S', 'L', or 'v').

Now there is only one formatting enumeration, making it a bit
easier to understand what's going on.

Passes buildall w/ toolstash -cmp.

Change-Id: I85bde2183eb22228fcf46d19d003401d588d9825
Reviewed-on: https://go-review.googlesource.com/c/go/+/275778
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-12-07 20:41:03 +00:00
Russ Cox
3904a62829 [dev.regabi] cmd/compile: remove mode.Sprintf etc in printer
This code is now hardly used and not worth the complexity.
It also tangles together Nodes and Types in a way that keeps
this code in package ir instead of package types.

Passes buildall w/ toolstash -cmp.

Change-Id: I2e829c1f6b602acbdc8ab4aac3b798f9ded762ef
Reviewed-on: https://go-review.googlesource.com/c/go/+/275777
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-12-07 20:40:58 +00:00
Russ Cox
fb17dfa43d [dev.regabi] cmd/compile: narrow interface between ir and types
Narrow the interface between package ir and package types
to make it easier to clean up the type formatting code all in one place.

Also introduce ir.BlankSym for use by OrigSym, so that later
OrigSym can move to package types without needing to reference
a variable of type ir.Node.

Passes buildall w/ toolstash -cmp.

Change-Id: I39fa419a1c8fb3318203e31cacc8d06399deeff9
Reviewed-on: https://go-review.googlesource.com/c/go/+/275776
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-12-07 20:40:52 +00:00
Russ Cox
3b25f3c150 [dev.regabi] cmd/compile: simplify Op, Node, Nodes printing
nconvFmt calls base.Fatalf if mode is anything but FErr,
proving that the only formats that matter for nodes are
plain %v, %S, and %L. And the nodes formatter can only get to %v.
(%S and %v are the same; we'll clean that up separately.)

Node and Nodes can therefore ignore mode, and all the mode
code can be removed from those implementations, removing
quite a few layers of abstraction.

Op similarly only runs in one mode and can be simplified.

Passes buildall w/ toolstash -cmp.

Change-Id: Ibfd845033e9c68181a20fb81c8f3dd428463920a
Reviewed-on: https://go-review.googlesource.com/c/go/+/275775
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-12-07 20:40:46 +00:00
Russ Cox
8ce2605c5b [dev.regabi] cmd/compile: untangle ir.Dump printing
The Node printing code is tangled up due to the multiple printing modes.
Split out the Dump mode into its own code, which clarifies it considerably.
We are going to have to change the code for the new Node representations,
so it is nice to have it in an understandable form first.

The output of Dump is unchanged except for the removal of spurious
mid-Dump blank lines that have been printed for a while but don't
really make sense and appear to be a bug.

The %+v verb on Op prints the name ("ADD" not "+"), matching
%+v on Node and %+v on Nodes to get Dump and DumpList formats.

Passes buildall w/ toolstash -cmp.

Change-Id: I07f0f245859f1f785e10bdd671855ca43c51b545
Reviewed-on: https://go-review.googlesource.com/c/go/+/275774
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-12-07 20:40:41 +00:00
Russ Cox
158c9dd131 [dev.regabi] cmd/compile: reorganize ir/fmt.go
This code is a few layer of abstraction stacked up on top
of each other, and they're hard to see all at the same time
because the file is pretty mixed up. As much as I try to avoid
code rearrangement to keep history, this one is long overdue.

A followup CL will cut out some of the layers, and the diff will be
much clearer what's going on with the code ordered with
callers near callees, as it is now.

Passes buildall w/ toolstash -cmp.

Change-Id: Iffc49d43cf4be9fab47e2dd59a5f98930573350f
Reviewed-on: https://go-review.googlesource.com/c/go/+/275773
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-12-07 20:40:34 +00:00
Russ Cox
a79742f39a [dev.regabi] cmd/compile: remove "short" node header mode
This is unreachable code - the only way short can be true is
if verb == 'S', but jconv is only called when verb == 'j'.
Simplify by removing.

Passes buildall w/ toolstash -cmp.

Change-Id: I27bd38319f72215069e940b320b5c82608e2651a
Reviewed-on: https://go-review.googlesource.com/c/go/+/275772
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-12-07 20:40:28 +00:00
Russ Cox
ef5964dd6b [dev.regabi] cmd/compile: arrange for typecheck1 to end in switch
Ending typecheck1 in the switch makes it safe for each case
to do an appropriate type assertion. The main change is dropping
the computation of "ok" and using the syntax nodes themselves
to decide what's OK.

Passes buildall w/ toolstash -cmp.

Change-Id: I2a1873a51e3f1194d74bb87a6653cb9857a02a1b
Reviewed-on: https://go-review.googlesource.com/c/go/+/275444
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-12-07 20:40:21 +00:00
Russ Cox
dcc640e839 [dev.regabi] test: add exhaustive test of evaluated but not used
Change-Id: I49db03c88b7595f1ea593df568244ad6aad3b024
Reviewed-on: https://go-review.googlesource.com/c/go/+/275443
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-12-07 20:40:14 +00:00
Russ Cox
2cec6c4a8c [dev.regabi] cmd/compile: generate Node methods using program
Add Node method generator by Matthew Dempsky,
lightly adapted to account for a few special cases.
No more writing these by hand.

Change-Id: I6933b895df666928b851bddf81b994799c0c97f7
Reviewed-on: https://go-review.googlesource.com/c/go/+/275434
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-12-07 20:40:08 +00:00
Tonis Tiigi
50cdb2d8e9 runtime/cgo: fix building on musl
sys/unistd.h only exists in glibc and not in musl so use the standard
location. This is a regression from CL 210639

Change-Id: Idd4c75510d9829316b44300c36c34df6d667cc05
GitHub-Last-Rev: 0fa4162f1c
GitHub-Pull-Request: golang/go#43038
Reviewed-on: https://go-review.googlesource.com/c/go/+/275732
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Andrew G. Morgan <agm@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Filippo Valsorda <filippo@golang.org>
2020-12-07 18:02:09 +00:00