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Commit Graph

51755 Commits

Author SHA1 Message Date
Archana R
7b15e297a2 cmd/compile: fix PrefetchStreamed builtin implementation on PPC64
This CL fixes encoding of PrefetchStreamed on PPC64 to be consistent
with what is implemented on AMD64 and ARM64 platforms which is
prefetchNTA (prefetch non-temporal access). Looking at the definition
of prefetchNTA, the closest corresponding Touch hint (TH) value to be
used on PPC64 is 16 that states that the address is accessed in a
transient manner. Current usage of TH=8 may cause degraded
performance.

Change-Id: I393bf5a9b971a22f632b3cbfb4fa659062af9a27
Reviewed-on: https://go-review.googlesource.com/c/go/+/390316
Reviewed-by: Paul Murphy <murp@ibm.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
2022-03-15 15:12:55 +00:00
Ian Lance Taylor
e475cf2e70 syscall: add race annotations to Windows ReadFile and WriteFile
For #51618
Fixes #51673

Change-Id: Ie63408d62303293d80afed8d5cf1cb164a8abecc
Reviewed-on: https://go-review.googlesource.com/c/go/+/392774
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
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2022-03-15 02:22:54 +00:00
fanzha02
49f16625c8 cmd/internal/obj/arm64: add TRN1 and TRN2 instructions support
Add test cases.

Fixes #51628

Change-Id: I433367d87e6bb5da5579c4be540079b92701c1fa
Reviewed-on: https://go-review.googlesource.com/c/go/+/392294
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Trust: Fannie Zhang <Fannie.Zhang@arm.com>
2022-03-15 01:25:23 +00:00
eric fang
44a0da4ff1 cmd/internal/obj/arm64: refactor the handling of shifted RSP
Some arithmetic operation instructions such as ADD and SUB support two
formats of left shift (<<) operation, namely shifted register format and
extended register format. And the encoding, supported registers and shifted
amount are both different.

The assembly parser doesn't distinguish them and parses them into TYPE_SHIFT
type, because the parser can't tell them apart and in most cases extended
left-shift can be replaced by shifted left-shift. The only exception is
when the second source register or the destination register is RSP.

This CL converts this case into the extended format in the preprocess stage,
which helps to simplify some of the logic of the new assembler implementation
and also makes this situation look more reasonable.

Change-Id: I2cd7d2d663b38a7ba77a9fef1092708b8cb9bc3d
Reviewed-on: https://go-review.googlesource.com/c/go/+/311709
Trust: Eric Fang <eric.fang@arm.com>
Run-TryBot: Eric Fang <eric.fang@arm.com>
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Reviewed-by: Cherry Mui <cherryyz@google.com>
2022-03-15 01:00:36 +00:00
Rob Pike
41a82aa9c3 text/template/parse: allow space after continue or break
Trivial fix: We must skip space after either of these keywords
before we expect a closing delimiter.

Also delete the stutter-generating extra 'in' in the error message.
(See what I did there?)

Fixes #51670

Change-Id: If5415632c36eaac6699bdc0aa6ce18be956c9b53
Reviewed-on: https://go-review.googlesource.com/c/go/+/392615
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Trust: Daniel Martí <mvdan@mvdan.cc>
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2022-03-15 00:19:35 +00:00
Keith Randall
15728ce950 cmd/compile: disable rewrite loop detector for deadcode-only changes
We're guaranteed we won't infinite loop on deadcode-only changes,
because each change converts valid -> invalid, and there are only a
finite number of valid values.

The loops this test is looking for are those generated by rule
applications, so it isn't useful to check for loops when rules aren't
involved.

Fixes #51639

Change-Id: Idf1abeab9d47baafddc3a1197d5064faaf07ef78
Reviewed-on: https://go-review.googlesource.com/c/go/+/392760
Trust: Keith Randall <khr@golang.org>
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Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Trust: Josh Bleecher Snyder <josharian@gmail.com>
2022-03-15 00:05:18 +00:00
Russ Cox
b7041c7ad1 cmd/api: require proposal # for new API features
Having the proposal numbers recorded in the API files
should help significantly when it comes time to audit
the new API additions at the end of each release cycle.

Change-Id: Id18e8cbdf892228a10ac17e4e21c7e17de5d4ff7
Reviewed-on: https://go-review.googlesource.com/c/go/+/392414
Trust: Russ Cox <rsc@golang.org>
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Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
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2022-03-14 21:43:16 +00:00
Keith Randall
5ccd8e5133 internal/cpu: disallow disabling options that are required for microarch
e.g., if GOAMD64=v3, don't allow GODEBUG=cpu.XXX=off for XXX which
are required for v3.

Change-Id: Ib58a4c8b13c5464ba476448ba44bbb261218787c
Reviewed-on: https://go-review.googlesource.com/c/go/+/391694
Trust: Keith Randall <khr@golang.org>
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Reviewed-by: Martin Möhrmann <martin@golang.org>
2022-03-14 21:23:36 +00:00
Robert Griesemer
41fe746857 go/types, types2: use correct underlying type in union set computation
Fixes #51658.

Change-Id: Ibf415d7e12849b8f50b58d74713613d4e65bc347
Reviewed-on: https://go-review.googlesource.com/c/go/+/392575
Trust: Robert Griesemer <gri@golang.org>
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Reviewed-by: Robert Findley <rfindley@google.com>
2022-03-14 18:03:37 +00:00
Cuong Manh Le
8419ec295c cmd/compile: fix wrong dict param when getting dict type
CL 338129 added getDictionaryType to get the dictionary type from the
specified dict param, but still using the one in info.dictParam, which
is wrong.

Fixes #51413

Change-Id: Ie13460c1e5751c4c5fc44479a44f6eed8b3b06e4
Reviewed-on: https://go-review.googlesource.com/c/go/+/391994
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Keith Randall <khr@golang.org>
2022-03-14 17:55:47 +00:00
Bryan C. Mills
676858f3d4 cmd/go: use testGOROOT in TestListTemplateContextFunction
This test uses testgo to run 'go list', so it should use the correct
GOROOT for testgo. (This may be particularly relevant when the test
binary itself is build with -trimpath, in which case runtime.GOROOT()
is not valid.)

Updates #51483

Change-Id: I79b310f88e3a200122d6289073df1385e3e97cca
Reviewed-on: https://go-review.googlesource.com/c/go/+/391801
Trust: Bryan Mills <bcmills@google.com>
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Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
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2022-03-14 17:51:51 +00:00
Bryan C. Mills
d99ff03821 go/build: set PWD for go subcommands
Since these commands already include an explicit Env field,
they will not be fixed automatically by proposal #50599.

Change-Id: Ia8157a71cf0cfe208bdc0da9aef54be3d26c795f
Reviewed-on: https://go-review.googlesource.com/c/go/+/391804
Trust: Bryan Mills <bcmills@google.com>
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Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
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2022-03-14 16:40:05 +00:00
Bryan C. Mills
471d319fb2 debug/buildinfo: use testenv.GoToolPath in tests instead of resolving "go" from $PATH
Updates #37475.

Change-Id: I8c3237438da3e9521ce3be26a0b5d5ca36944b17
Reviewed-on: https://go-review.googlesource.com/c/go/+/391803
Trust: Bryan Mills <bcmills@google.com>
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Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
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2022-03-14 16:33:16 +00:00
Cuong Manh Le
7900576bac cmd/compile: remove unified IR stmtTypeDeclHack
After CL 385998, unified IR quirks mode was gone, it's time to remove
stmtTypeDeclHack, too.

Change-Id: Id73dd1d6c11b91c0c6c6cbe85f1b06977a9876d2
Reviewed-on: https://go-review.googlesource.com/c/go/+/392214
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2022-03-14 11:03:14 +00:00
Uzondu Enudeme
ab0f7611d7 net/url: add OmitHost bool to url.URL
Previously, myscheme:/path and myscheme:///path were treated as the same URL
although materially different. The distinction made clear by RFC 3986 sec. 5.3 where
a different recomposition behavior is expected when a URI reference has an undefined
host(authority) as in myscheme:/path vs. one with an empty host(authority)
as in myscheme:///path.

This change fixes the Parse/String roundtrip limitation for URLs with an undefined
host and a single slash.

Fixes #46059

Change-Id: I1b8d6042135513616374ff8c8dfb1cdb640f8efe
Reviewed-on: https://go-review.googlesource.com/c/go/+/391294
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
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2022-03-14 09:19:01 +00:00
Tobias Klauser
3c2e73c8c3 runtime/pprof: use syscall.RUSAGE_SELF
Change-Id: Idc37429de5a48e708eda868ca7fa26b28620bac0
Reviewed-on: https://go-review.googlesource.com/c/go/+/391854
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2022-03-13 21:31:06 +00:00
Ian Lance Taylor
842d37ee5f syscall: add race annotations to Pread and Pwrite
Fixes #51618

Change-Id: Ife894d8c313dce8c4929f40fa0ac90a069f77a89
Reviewed-on: https://go-review.googlesource.com/c/go/+/391954
Trust: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Keith Randall <khr@golang.org>
2022-03-12 23:32:36 +00:00
eh-steve
baf61e4a67 encoding/hex: implement Decode with a lookup table
Implement hex decode using a 256 byte lookup table instead of branching logic.

In happy flow, uses 3x 64 byte (or 5x 32 byte) cache lines.

	name             old time/op    new time/op    delta
	Decode/256-64       223ns ± 3%     135ns ± 2%  -39.64%  (p=0.000 n=8+8)
	Decode/1024-64      872ns ± 2%     512ns ± 2%  -41.25%  (p=0.000 n=8+8)
	Decode/4096-64     3.43µs ± 1%    2.01µs ± 2%  -41.31%  (p=0.001 n=7+7)
	Decode/16384-64    13.9µs ± 1%     8.0µs ± 1%  -42.69%  (p=0.000 n=8+7)

	name             old speed      new speed      delta
	Decode/256-64    1.15GB/s ± 3%  1.90GB/s ± 2%  +65.66%  (p=0.000 n=8+8)
	Decode/1024-64   1.17GB/s ± 2%  2.00GB/s ± 2%  +70.22%  (p=0.000 n=8+8)
	Decode/4096-64   1.20GB/s ± 1%  2.04GB/s ± 2%  +70.39%  (p=0.001 n=7+7)
	Decode/16384-64  1.18GB/s ± 1%  2.06GB/s ± 1%  +74.49%  (p=0.000 n=8+7)

Also reduces amd64 object size by 766 bytes, despite the extra RODATA due to removal of `fromHexChar()` and duplicated inlined versions of it and simplification of `Decode()`.

Change-Id: I0988c7a30562ec154eff11db6e27954e0ce2b611
GitHub-Last-Rev: 64818018af
GitHub-Pull-Request: golang/go#51432
Reviewed-on: https://go-review.googlesource.com/c/go/+/390037
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
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2022-03-11 21:51:20 +00:00
Paul E. Murphy
7b1ba972dc cmd/asm: add support for bdnz/bdz extended mnemonics on PPC64
Support BDNZ and BDZ mnemonics, they are commonly used
POWER instructions. The raw BC mnemonic is not easy
to read.

Likewise, cleanup code surrounding these changes.

Change-Id: I72f1dad5013f7856bd0dd320bfb17b5a9f3c69ee
Reviewed-on: https://go-review.googlesource.com/c/go/+/390696
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Trust: Paul Murphy <murp@ibm.com>
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2022-03-11 14:06:56 +00:00
Tobias Klauser
c1f22134f2 runtime/pprof, syscall: report MaxRSS on all unix platforms
All unix platforms currently supported by Go provide the getrusage
syscall. On aix and solaris the Getrusage syscall wrapper is not
available yet, so add and use it to report MaxRSS in memory profiles.

Change-Id: Ie880a3058171031fd2e12ccf9adfb85ce18858b1
Reviewed-on: https://go-review.googlesource.com/c/go/+/391434
Trust: Tobias Klauser <tobias.klauser@gmail.com>
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Reviewed-by: Michael Pratt <mpratt@google.com>
Trust: Michael Pratt <mpratt@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2022-03-11 06:03:26 +00:00
Robert Griesemer
fe75fe3c7a spec: various minor clarifications
- Allow for a type parameter as length/capacity to make.
- Be slightly more precise in prose for append.
- Add a couple of links.

Change-Id: Ib97e528bab1ab55d271beeeb53d9bb7a07047b9b
Reviewed-on: https://go-review.googlesource.com/c/go/+/391754
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2022-03-11 06:00:18 +00:00
Robert Griesemer
59d80227ef spec: clean up intro and replace bolded text with prose
- Remove "Draft" disclaimer. We're not done but the spec
  is in usable shape with respect to generics features.

- Remove section on "Earlier version" and fold information
  into the "Intro" section.

- Remove caveat for shifts: the rules for arithmetic operators
  on type parameters apply for them as well.

- Simply state that we don't support arguments of type parameter
  type for the built-ins real, imag, and complex.

Fixes #51182.

Change-Id: I6df1427de685cfe7055b64e91753aa7ebff70565
Reviewed-on: https://go-review.googlesource.com/c/go/+/391695
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2022-03-11 06:00:14 +00:00
Bryan C. Mills
751b8798dd cmd/compile/internal/amd64: fix "missing objdump" skip in TestGoAMD64v1
The skip was erroneously applied to errors from the call to StdoutPipe
instead of Start, and even then was a bit too broad.

Change-Id: I417c9a74692383230fc6d99ebb4149fdc532533e
Reviewed-on: https://go-review.googlesource.com/c/go/+/391800
Trust: Bryan Mills <bcmills@google.com>
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2022-03-11 05:22:30 +00:00
Bryan C. Mills
ef7d0413c2 cmd/go: use the correct gofmt binary in TestScript/fmt_load_errors
Otherwise, this test may fail when GOROOT/bin is not in $PATH.

Change-Id: Id744f365f6604716207184c9ea49436ab2e3a835
Reviewed-on: https://go-review.googlesource.com/c/go/+/391802
Trust: Bryan Mills <bcmills@google.com>
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2022-03-11 05:06:51 +00:00
Cuong Manh Le
9743e9b6d8 cmd/compile: fix re-export closure
For hidden closure built during stenciling to implement a function
instantiation, the function may come from other package, not local
package, which causes the ICE for code that re-export the hidden closure
after inlining.

To fix it, use the closure package for export writer when writing out
the closure itself.

Fixes #51423

Change-Id: I23b067ba14e2d602a0fc3b2e99bd9317afbe53ff
Reviewed-on: https://go-review.googlesource.com/c/go/+/391574
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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Reviewed-by: Keith Randall <khr@golang.org>
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2022-03-11 00:42:08 +00:00
Steven Johnstone
5003ed884a internal/fuzz: minimization should not reduce coverage
Minimization should result in a fuzz input which
includes the same coverage bits as the original
input.

Updates #48326

Change-Id: I6c5f30058b57ccd1a096ad0e9452a4dfbb7d9aab
Reviewed-on: https://go-review.googlesource.com/c/go/+/391454
Trust: Bryan Mills <bcmills@google.com>
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2022-03-10 23:06:14 +00:00
Roland Shoemaker
bd71dee2b4 internal/fuzz: don't use dirty coverage maps during minimization
When minimizing a value, if the value cannot be minimized (i.e. it is
the final value is the same value as was sent for minimization) return
the initial coverage map, rather than the coverageSnapshot, which is
actually the coverage map for the final minimization step and may not
accurately reflect whether the input actually expands the coverage set
or not.

Updates #48326

Change-Id: I01f0eebe5841e808b6799647d2e5fe3aa45cd2e0
Reviewed-on: https://go-review.googlesource.com/c/go/+/391614
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2022-03-10 22:50:18 +00:00
Robert Griesemer
914195c132 go/types, types2: remove incorrect assertion (don't crash)
The removed assertion was never incorrect, as signatures may
be from methods in interfaces, and (some) interfaces set the
receivers of their methods (so we have a position for error
reporting).

This CL changes the issue below from a release blocker to an
issue for Go 1.19.

For #51593.

Change-Id: I0c5f2913b397b9ab557ed74a80cc7a715e840412
Reviewed-on: https://go-review.googlesource.com/c/go/+/391615
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2022-03-10 21:10:30 +00:00
Keith Randall
2e46a0a997 cmd/compile: fix expression switches using type parameters
Both the thing we're switching on, as well as the cases we're switching for.
Convert anything containing a type parameter to interface{} before the
comparison happens.

Fixes #51522

Change-Id: I97ba9429ed332cb7d4240cb60f46d42226dcfa5f
Reviewed-on: https://go-review.googlesource.com/c/go/+/391594
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2022-03-10 19:30:33 +00:00
Keith Randall
8cf11694ab cmd/compile: fix transform of OEQ/ONE when one arg is a type param
At this point in stenciling, we have shape types, not raw type parameters.
The code was correct in the other part of this function.

Update #51522

Change-Id: Ife495160a2be5f6af5400363c3efb68dda518b5f
Reviewed-on: https://go-review.googlesource.com/c/go/+/391475
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2022-03-10 18:50:50 +00:00
Joe Tsai
91daaabd56 flag: add TextVar function
The TextVar function makes it easier to integrate the flag package
with any Go type that implements encoding.Text{Marshaler,Unmarshaler}.

Fixes #45754

Change-Id: Id23c37d59cf8c9699a7943a22ce27a45eb685c0f
Reviewed-on: https://go-review.googlesource.com/c/go/+/313329
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2022-03-10 16:56:17 +00:00
Joe Tsai
2d026a4ea5 bytes: rely on runtime.growslice for growing
Rather than naively making a slice of capacity 2*c+n,
rely on the append(..., make(...)) pattern to allocate a
slice that aligns up to the closest size class.

Performance:
	name                          old time/op    new time/op    delta
	BufferWriteBlock/N4096       3.03µs ± 6%    2.04µs ± 6%  -32.60%  (p=0.000 n=10+10)
	BufferWriteBlock/N65536      47.8µs ± 6%    28.1µs ± 2%  -41.32%  (p=0.000 n=9+8)
	BufferWriteBlock/N1048576     844µs ± 7%     510µs ± 5%  -39.59%  (p=0.000 n=8+9)

	name                          old alloc/op   new alloc/op   delta
	BufferWriteBlock/N4096       12.3kB ± 0%     7.2kB ± 0%  -41.67%  (p=0.000 n=10+10)
	BufferWriteBlock/N65536       258kB ± 0%     130kB ± 0%  -49.60%  (p=0.000 n=10+10)
	BufferWriteBlock/N1048576    4.19MB ± 0%    2.10MB ± 0%  -49.98%  (p=0.000 n=10+8)

	name                          old allocs/op  new allocs/op  delta
	BufferWriteBlock/N4096         3.00 ± 0%      3.00 ± 0%     ~     (all equal)
	BufferWriteBlock/N65536        7.00 ± 0%      7.00 ± 0%     ~     (all equal)
	BufferWriteBlock/N1048576      11.0 ± 0%      11.0 ± 0%     ~     (all equal)

The performance is faster since the growth rate is capped at 2x,
while previously it could grow by amounts potentially much greater than 2x,
leading to significant amounts of memory waste and extra copying.

Credit goes to Martin Möhrmann for suggesting the
append(b, make([]T, n)...) pattern.

Fixes #42984
Updates #51462

Change-Id: I7b23f75dddbf53f8b8b93485bb1a1fff9649b96b
Reviewed-on: https://go-review.googlesource.com/c/go/+/349994
Trust: Joseph Tsai <joetsai@digital-static.net>
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
2022-03-10 16:24:16 +00:00
Michael Pratt
1cf67709be runtime: fix SegvInCgo skip check
CL 390034 changed this throw message to add the goid, breaking the
match.

For #50979.

Change-Id: I52d97695484938701e5b7c269e2caf0c87d44d7a
Reviewed-on: https://go-review.googlesource.com/c/go/+/391139
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
2022-03-10 16:06:29 +00:00
Daniel Martí
5a040c5a36 go/token: allocate fewer times at init time
go/token has had a global "keywords" map filled at init time for years.
Overall, the package's init time cost is small, as per GODEBUG=inittrace=1:

	init go/token @0.51 ms, 0.004 ms clock, 1776 bytes, 5 allocs
	init go/token @0.44 ms, 0.003 ms clock, 1776 bytes, 5 allocs
	init go/token @0.45 ms, 0.003 ms clock, 1568 bytes, 4 allocs

However, adding the map size hint does help with the allocations:

	init go/token @0.45 ms, 0.002 ms clock, 944 bytes, 2 allocs
	init go/token @0.46 ms, 0.002 ms clock, 944 bytes, 2 allocs
	init go/token @0.55 ms, 0.003 ms clock, 1152 bytes, 3 allocs

Three samples are rather unscientific, and the clock time is basically
unchanged, but we might as well reduce the allocs.

Change-Id: I48121a4cea4113d991882e32f274d7b7736800dc
Reviewed-on: https://go-review.googlesource.com/c/go/+/391094
Trust: Daniel Martí <mvdan@mvdan.cc>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
2022-03-10 09:12:04 +00:00
Meng Zhuo
29b968e766 runtime,cmd/compile: change reg duff{zero,copy} for regabi riscv64
As CL 356519 require, X8-X23 will be argument register, however X10, X11
is used by duff device.

This CL changes X10, X11 into X24, X25 to meet the prerequisite.

Update #40724

Change-Id: Ie9b899afbba7e9a51bb7dacd89e49ca1c1fc33ff
Reviewed-on: https://go-review.googlesource.com/c/go/+/357976
Trust: mzh <mzh@golangcn.org>
Run-TryBot: mzh <mzh@golangcn.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Joel Sing <joel@sing.id.au>
2022-03-10 06:26:28 +00:00
Robert Griesemer
00535b8398 spec: remove note re: field accesses on type literals
For #51576.

Change-Id: I43f72c3fb618e724d46360a70ab9f8abc3d63273
Reviewed-on: https://go-review.googlesource.com/c/go/+/391137
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2022-03-10 01:57:27 +00:00
Robert Griesemer
6fb07317e5 spec: more adjustments/corrections
- Change section title from "Type parameters lists" to
  "Type parameter declarations" as the enclosing section
  is about declarations.

- Correct section on parsing ambiguity in type parameter
  lists.

- Rephrase paragraphs on type parameters for method receivers
  and adjust examples.

- Remove duplicate prose in section on function argument type
  inference.

- Clarified "after substitution" column in Instantiations section.

Change-Id: Id76be9804ad96a3f1221e5c4942552dde015dfcb
Reviewed-on: https://go-review.googlesource.com/c/go/+/390994
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2022-03-10 01:57:22 +00:00
Robert Griesemer
46f352de2d spec: remove notion of specific types
Specific types were introduced to explain rules for operands of
type parameter type. Specific types are really an implementation
mechanism to represent (possibly infinite) type sets in the machine;
they are not needed in the specification.

A specific type is either standing for a single named or unnamed
type, or it is the underlying (unnamed) type of an infinite set of
types. Each rule that applies to a type T of the set of specific
types must also apply to all types T' in the type set for which T
is a representative of. Thus, in the spec we can simply refer to
the type set directly, infinite or not.

Rather then excluding operands with empty type sets in each instance,
leave unspecified what happens when such an operand is used. Instead
give an implementation some leeway with an implementation restriction.

(The implementation restriction also needs to be formulated for types,
such as in conversions, which technically are not "operands". Left for
another CL.)

Minor: Remove the two uses of the word "concrete" to refer to non-
interface types; instead just say "non-interface type" for clarity.

Change-Id: I67ac89a640c995369c9d421a03820a0c0435835a
Reviewed-on: https://go-review.googlesource.com/c/go/+/390694
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2022-03-10 01:57:17 +00:00
Carl Johnson
604140d931 net/url: add JoinPath, URL.JoinPath
Builds on CL 332209.

Fixes #47005

Change-Id: I82708dede05d79a196ca63f5a4e7cb5ac9a041ea
GitHub-Last-Rev: 51b735066e
GitHub-Pull-Request: golang/go#50383
Reviewed-on: https://go-review.googlesource.com/c/go/+/374654
Reviewed-by: Russ Cox <rsc@golang.org>
Auto-Submit: Russ Cox <rsc@golang.org>
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
2022-03-10 01:34:17 +00:00
Meng Zhuo
9faef5a654 cmd/compile,bytealg: change context register on riscv64
The register ABI will use X8-X23 (CL 356519),
this CL changes context register from X20(S4) to X26(S10) to meet the
prerequisite.

Update #40724

Change-Id: I93d51d22fe7b3ea5ceffe96dff93e3af60fbe7f6
Reviewed-on: https://go-review.googlesource.com/c/go/+/357974
Trust: mzh <mzh@golangcn.org>
Run-TryBot: mzh <mzh@golangcn.org>
Reviewed-by: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
2022-03-10 01:28:37 +00:00
Robert Griesemer
3a5e3d8173 go/types, types2: pointer base types cannot be type constraints
Pointer types may appear in expressions *P and we don't know if
we have an indirection (P is a pointer value) or a pointer type
(P is a type) until we type-check P. Don't forget to check that
a type P must be an ordinary (not a constraint) type in this
special case.

Fixes #51578.

Change-Id: If782cc6dd2a602a498574c78c99e40c3b72274a5
Reviewed-on: https://go-review.googlesource.com/c/go/+/391275
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
2022-03-09 23:21:06 +00:00
Robert Findley
e189b5e06d go/types, types2: clarify documentation with respect to generic types
Address several areas where documentation was inaccurate or unclear
regarding generic types. Also prefer the use of the word 'generic' over
'parameterized', and add additional documentation for the use of
SetConstraint.

For #49593

Change-Id: Iccac60d1b3e2c45a57a3d03b3c10984293af57dd
Reviewed-on: https://go-review.googlesource.com/c/go/+/391154
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
2022-03-09 22:51:34 +00:00
Russ Cox
a987aaf5f7 cmd/compile: require -p flag
The -p flag specifies the import path of the package being compiled.
This CL makes it required when invoking the compiler and
adjusts tests that invoke the compiler directly to conform to this
new requirement. The go command already passes the flag, so it
is unmodified in this CL. It is expected that any other Go build systems
also already pass -p, or else they will need to arrange to do so before
updating to Go 1.19. Of particular note, Bazel already does for rules
with an importpath= attribute, which includes all Gazelle-generated rules.

There is more cleanup possible now in cmd/compile, cmd/link,
and other consumers of Go object files, but that is left to future CLs.

Additional historical background follows but can be ignored.

Long ago, before the go command, or modules, or any kind of
versioning, symbols in Go archive files were named using just the
package name, so that for example func F in math/rand and func F in
crypto/rand would both be the object file symbol 'rand.F'. This led to
collisions even in small source trees, which made certain packages
unusable in the presence of other packages and generally was a problem
for Go's goal of scaling to very large source trees.

Fixing this problem required changing from package names to import
paths in symbol names, which was mostly straightforward. One wrinkle,
though, is that the compiler did not know the import path of the
package being compiled; it only knew the package name. At the time,
there was no go command, just Makefiles that people had invoking 6g
(now “go tool compile”) and then copying the resulting object file to
an importable location. That is, everyone had a custom build setup for
Go, because there was no standard one. So it was not particularly
attractive to change how the compiler was invoked, since that would
break approximately every Go user at the time. Instead, we arranged
for the compiler to emit, and other tools reading object files to
recognize, a special import path (the empty string, it turned out)
denoting “the import path of this object file”. This worked well
enough at the time and maintained complete command-line compatibility
with existing Go usage.

The changes implementing this transition can be found by searching
the Git history for “package global name space”, which is what they
eliminated. In particular, CL 190076 (a6736fa4), CL 186263 (758f2bc5),
CL 193080 (1cecac81), CL 194053 (19126320), and CL 194071 (531e6b77)
did the bulk of this transformation in January 2010.

Later, in September 2011, we added the -p flag to the compiler for
diagnostic purposes. The problem was that it was easy to create import
cycles, especially in tests, and these could not be diagnosed until
link time. You'd really want the compiler to diagnose these, for
example if the compilation of package sort noticed it was importing a
package that itself imported "sort". But the compilation of package
sort didn't know its own import path, and so it could not tell whether
it had found itself as a transitive dependency. Adding the -p flag
solved this problem, and its use was optional, since the linker would
still diagnose the import cycle in builds that had not updated to
start passing -p. This was CL 4972057 (1e480cd1).

There was still no go command at this point, but when we introduced
the go command we made it pass -p, which it has for many years at this
point.

Over time, parts of the compiler began to depend on the presence of
the -p flag for various reasonable purposes. For example:

In CL 6497074 (041fc8bf; Oct 2012), the race detector used -p to
detect packages that should not have race annotations, such as
runtime/race and sync/atomic.

In CL 13367052 (7276c02b; Sep 2013), a bug fix used -p to detect the
compilation of package reflect.

In CL 30539 (8aadcc55; Oct 2016), the compiler started using -p to
identify package math, to be able to intrinsify calls to Sqrt inside
that package.

In CL 61019 (9daee931; Sep 2017), CL 71430 (2c1d2e06; Oct 2017), and
later related CLs, the compiler started using the -p value when
creating various DWARF debugging information.

In CL 174657 (cc5eaf93; May 2019), the compiler started writing
symbols without the magic empty string whenever -p was used, to reduce
the amount of work required in the linker.

In CL 179861 (dde7c770; Jun 2019), the compiler made the second
argument to //go:linkname optional when -p is used, because in that
case the compiler can derive an appropriate default.

There are more examples. Today it is impossible to compile the Go
standard library without using -p, and DWARF debug information is
incomplete without using -p.

All known Go build systems pass -p. In particular, the go command
does, which is what nearly all Go developers invoke to build Go code.
And Bazel does, for go_library rules that set the importpath
attribute, which is all rules generated by Gazelle.

Gccgo has an equivalent of -p and has required its use in order to
disambiguate packages with the same name but different import paths
since 2010.

On top of all this, various parts of code generation for generics
are made more complicated by needing to cope with the case where -p
is not specified, even though it's essentially always specified.

In summary, the current state is:

 - Use of the -p flag with cmd/compile is required for building
   the standard library, and for complete DWARF information,
   and to enable certain linker speedups.

 - The go command and Bazel, which we expect account for just
   about 100% of Go builds, both invoke cmd/compile with -p.

 - The code in cmd/compile to support builds without -p is
   complex and has become more complex with generics, but it is
   almost always dead code and therefore not worth maintaining.

 - Gccgo already requires its equivalent of -p in any build
   where two packages have the same name.

All this supports the change in this CL, which makes -p required
and adjusts tests that invoke cmd/compile to add -p appropriately.

Future CLs will be able to remove all the code dealing with the
possibility of -p not having been specified.

Change-Id: I6b95b9d4cffe59c7bac82eb273ef6c4a67bb0e43
Reviewed-on: https://go-review.googlesource.com/c/go/+/391014
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2022-03-09 21:31:58 +00:00
Robert Griesemer
b8248fab89 go/types, types2: disable field accesses through type parameters
This is a feature that is not understood well enough and may have
subtle repercussions impacting future changes. Disable for Go 1.18.

The actual change is trivial: disable a branch through a flag.
The remaining changes are adjustments to tests.

Fixes #51576.

Change-Id: Ib77b038b846711a808315a8889b3904e72367bce
Reviewed-on: https://go-review.googlesource.com/c/go/+/391135
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
2022-03-09 21:26:42 +00:00
Mark Pulford
7026eeb8cf cmd/go: fix buildvcs when using older git versions
Git versions before v2.10.0 do not support --no-show-signature.
Using "-c" allows Git to ignore the configuration option if it does not
exist.

Fixes #51253

Change-Id: I2b1adaca0eb18ae31f2e1119e354ce515b00cfc2
Reviewed-on: https://go-review.googlesource.com/c/go/+/388194
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
2022-03-09 17:16:12 +00:00
Rhys Hiltner
0d33a99675 runtime/pprof: fix pcDeck's frame indexing
When building the inlining deck, correctly identify which is the last
frame in the deck. Otherwise, when some forms of inlining cause a PC to
expand to multiple frames, the length of the deck's two slices will
diverge.

Fixes #51567

Change-Id: I24e7ba32cb16b167f4307178b3f03c29e5362c4b
Reviewed-on: https://go-review.googlesource.com/c/go/+/391134
Reviewed-by: Michael Pratt <mpratt@google.com>
Trust: Than McIntosh <thanm@google.com>
2022-03-09 17:07:49 +00:00
Matthew Dempsky
7160e32529 cmd/compile: mark instantiated generic functions as DUPOK
Unified IR wasn't marking instantiated generic functions as DUPOK,
even though they can appear in multiple compilation units, which
evidently interfered with cmd/link's dead code elimination logic.

Manually confirmed to fix the issue, but non-trivial to test within
$GOROOT/test currently, because it's only reproducible when
cmd/compile is invoked with -p. @rsc is currently investigating
updating test/run.go appropriately, after which I'll revisit writing a
test case.

Fixes #51519.

Change-Id: I74a79ed0ca15b25b826e419714af5ceb6e567012
Reviewed-on: https://go-review.googlesource.com/c/go/+/390956
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
2022-03-09 16:08:24 +00:00
eric fang
c6d9b38dd8 cmd/internal/obj/arm64: optimize function prologue/epilogue with STP/LDP
In function prologue and epilogue, we save and restore FP and LR
registers, and adjust RSP. The current instruction sequence is as
follow.

For frame size <= 240B,
  prologue:
    MOVD.W	R30, -offset(RSP)
    MOVD	R29, -8(RSP)
  epilogue:
    MOVD	-8(RSP), R29
    MOVD.P	offset(RSP), R30

For frame size > 240B,
  prologue:
    SUB		$offset, RSP, R27
    MOVD	R30, (R27)
    MOVD	R27, RSP
    MOVD	R29, -8(RSP)
  epilogue:
    MOVD	-8(RSP), R29
    MOVD	(RSP), R30
    ADD		$offset, RSP

Each sequence uses two load or store instructions, actually we can load
or store two registers with one LDP or STP instruction. This CL changes
the sequences as follow.

For frame size <= 496B,
  prologue:
    STP		(R29, R30), -(offset+8)(RSP)
    SUB		$offset, RSP, RSP
  epilogue:
    LDP		-8(RSP), (R29, R30)
    ADD		$offset, RSP, RSP

For frame size > 496B,
  prologue:
    SUB		$offset, RSP, R20
    STP		(R29, R30), -8(R20)
    MOVD	R20, RSP
  epilogue:
    LDP		-8(RSP), (R29, R30)
    ADD		$offset, RSP, RSP

Change-Id: Ia58af85fc81cce9b7c393dc38df43bffb203baad
Reviewed-on: https://go-review.googlesource.com/c/go/+/379075
Reviewed-by: Cherry Mui <cherryyz@google.com>
Trust: Eric Fang <eric.fang@arm.com>
Run-TryBot: Eric Fang <eric.fang@arm.com>
2022-03-09 06:51:37 +00:00
Meng Zhuo
1045faa38c cmd/compile/internal: add ABI register information for riscv64
This CL adds the defines for ABI registers on riscv64.

Updates #40724

Change-Id: I53a89d88b6feb1a88cf7008b8484d444791e8a55
Reviewed-on: https://go-review.googlesource.com/c/go/+/356519
Trust: mzh <mzh@golangcn.org>
Run-TryBot: mzh <mzh@golangcn.org>
Reviewed-by: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
2022-03-09 05:28:28 +00:00
Ian Lance Taylor
20d333b6f4 cmd/go: for gccgo expect one fewer file in TestScript/list_swigcxx
One of the files in CompileGoFiles is actually _cgo_import.go, but
that file is only generated for gc, not for gccgo.

Change-Id: I87bb55552e1409cc57da8f35a32b37ce4a3df60c
Reviewed-on: https://go-review.googlesource.com/c/go/+/390895
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
2022-03-08 23:18:30 +00:00