Commit Graph

21637 Commits

Author SHA1 Message Date
qmuntal 012297a862 cmd/gofmt: set backup file permissions on Windows
File.Chmod is supported on Windows since CL 250077, there is no need
to skip the call anymore.

Updates #18026

Change-Id: Ie03cf016e651b93241f73067614fc4cb341504ef
Reviewed-on: https://go-review.googlesource.com/c/go/+/480416
Run-TryBot: Quim Muntal <quimmuntal@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2023-03-31 22:38:04 +00:00
qmuntal 3b956dc2d9 go/internal/gcimport: unskip Windows tests
There are many tests in internal/gcimporter that are skipped on
Windows because they build a test program that needs the -D flag
when invoking the Go compiler.

This flag is already passed since CL 442303, so there is no need to
skip those tests.

Change-Id: I877e670194048bda9a52ad2568650cf33eacfb5a
Reviewed-on: https://go-review.googlesource.com/c/go/+/480415
Run-TryBot: Quim Muntal <quimmuntal@gmail.com>
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2023-03-31 22:22:05 +00:00
qmuntal 75317dee39 cmd/objdump: unskip TestDisasmExtld on Windows
Windows has supported external linking for a while, there is no
need to skip this test.

Change-Id: Ic3d0cc3441ee670767dae085db5e62fce205ff04
Reviewed-on: https://go-review.googlesource.com/c/go/+/480417
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Quim Muntal <quimmuntal@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
2023-03-31 21:48:16 +00:00
Austin Clements bb44c2b54e sync: implement OnceFunc, OnceValue, and OnceValues
This adds the three functions from #56102 to the sync package. These
provide a convenient API for the most common uses of sync.Once.

The performance of these is comparable to direct use of sync.Once:

$ go test -run ^$ -bench OnceFunc\|OnceVal -count 20 | benchstat -row .name -col /v
goos: linux
goarch: amd64
pkg: sync
cpu: 11th Gen Intel(R) Core(TM) i7-1185G7 @ 3.00GHz
          │     Once     │                Global                 │                Local                 │
          │    sec/op    │    sec/op     vs base                 │    sec/op     vs base                │
OnceFunc    1.3500n ± 6%   2.7030n ± 1%  +100.22% (p=0.000 n=20)   0.3935n ± 0%  -70.86% (p=0.000 n=20)
OnceValue   1.3155n ± 0%   2.7460n ± 1%  +108.74% (p=0.000 n=20)   0.5478n ± 1%  -58.35% (p=0.000 n=20)

The "Once" column represents the baseline of how code would typically
express these patterns using sync.Once. "Global" binds the closure
returned by OnceFunc/OnceValue to global, which is how I expect these
to be used most of the time. Currently, this defeats some inlining
opportunities, which roughly doubles the cost over sync.Once; however,
it's still *extremely* fast. Finally, "Local" binds the returned
closure to a local variable. This unlocks several levels of inlining
and represents pretty much the best possible case for these APIs, but
is also unlikely to happen in practice. In principle the compiler
could recognize that the global in the "Global" case is initialized in
place and never mutated and do the same optimizations it does in the
"Local" case, but it currently does not.

Fixes #56102

Change-Id: If7355eccd7c8de7288d89a4282ff15ab1469e420
Reviewed-on: https://go-review.googlesource.com/c/go/+/451356
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Andrew Gerrand <adg@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Caleb Spare <cespare@gmail.com>
Auto-Submit: Austin Clements <austin@google.com>
2023-03-31 20:01:17 +00:00
Austin Clements 2ff684a541 cmd/compile: allow more inlining of functions that construct closures
Currently, when the inliner is determining if a function is
inlineable, it descends into the bodies of closures constructed by
that function. This has several unfortunate consequences:

- If the closure contains a disallowed operation (e.g., a defer), then
  the outer function can't be inlined. It makes sense that the
  *closure* can't be inlined in this case, but it doesn't make sense
  to punish the function that constructs the closure.

- The hairiness of the closure counts against the inlining budget of
  the outer function. Since we currently copy the closure body when
  inlining the outer function, this makes sense from the perspective
  of export data size and binary size, but ultimately doesn't make
  much sense from the perspective of what should be inlineable.

- Since the inliner walks into every closure created by an outer
  function in addition to starting a walk at every closure, this adds
  an n^2 factor to inlinability analysis.

This CL simply drops this behavior.

In std, this makes 57 more functions inlinable, and disallows inlining
for 10 (due to the basic instability of our bottom-up inlining
approach), for an net increase of 47 inlinable functions (+0.6%).

This will help significantly with the performance of the functions to
be added for #56102, which have a somewhat complicated nesting of
closures with a performance-critical fast path.

The downside of this seems to be a potential increase in export data
and text size, but the practical impact of this seems to be
negligible:

               │    before    │           after            │
               │    bytes     │    bytes      vs base      │
Go/binary        15.12Mi ± 0%   15.14Mi ± 0%  +0.16% (n=1)
Go/text          5.220Mi ± 0%   5.237Mi ± 0%  +0.32% (n=1)
Compile/binary   22.92Mi ± 0%   22.94Mi ± 0%  +0.07% (n=1)
Compile/text     8.428Mi ± 0%   8.435Mi ± 0%  +0.08% (n=1)

Change-Id: Ie9e38104fed5689a94c368288653fd7cb4b7a35e
Reviewed-on: https://go-review.googlesource.com/c/go/+/479095
Reviewed-by: Than McIntosh <thanm@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Auto-Submit: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
2023-03-31 20:00:40 +00:00
Philippe Antoine 092d43c329 all: replace fmt.Sprintf("%d") with strconv.Itoa
This was found by running `git grep 'fmt.Sprintf("%d",' | grep -v test | grep -v vendor`

And this was automatically fixed with gotiti https://github.com/catenacyber/gotiti
and using unconvert https://github.com/mdempsky/unconvert
to check if there was (tool which fixed another useless cast)

Change-Id: I023926bc4aa8d51de45f712ac739a0a80145c28c
GitHub-Last-Rev: 1063e32e5b
GitHub-Pull-Request: golang/go#59144
Reviewed-on: https://go-review.googlesource.com/c/go/+/477675
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
2023-03-31 18:41:24 +00:00
Cuong Manh Le e539461e34 cmd/compile: emit ODCL node for autotmp during RewriteNonNameCall
For f()() call, the compiler rewrite it roughly to:

	autotmp := f()
	autotmp()

However, if f() were inlined, escape analysis will confuse about the
lifetime of autotmp, leading to bad escaping decision.

This CL fixes this issue by rewriting f()() to:

	var autotmp
	autotmp = f()
	autotmp()

This problem also happens with Unified IR, until CL 421821 land.

Fixes #57434

Change-Id: I159a7e4c93bbc172f0eae60e7d40fc64ba70b236
Reviewed-on: https://go-review.googlesource.com/c/go/+/459295
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
2023-03-31 18:41:12 +00:00
Russ Cox a7fd2fab0e doc: add godebug.md, documenting GODEBUG
Document the changes to GODEBUG implemented as
part of proposal #56986.

Fixes #56986.

Change-Id: I23153a123e23820c5b22db4767620e037bbdd083
Reviewed-on: https://go-review.googlesource.com/c/go/+/462202
Reviewed-by: Damien Neil <dneil@google.com>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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Auto-Submit: Russ Cox <rsc@golang.org>
2023-03-31 16:05:14 +00:00
Guoqi Chen e29dd78ffe cmd/internal/obj: remove redundant cnames on loong64
Change-Id: I5aa6328a12e74b2801ab60b5a5bb8571d382d5ef
Reviewed-on: https://go-review.googlesource.com/c/go/+/425301
Reviewed-by: xiaodong liu <teaofmoli@gmail.com>
Reviewed-by: Meidan Li <limeidan@loongson.cn>
Reviewed-by: WANG Xuerui <git@xen0n.name>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
Auto-Submit: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2023-03-31 03:39:50 +00:00
WANG Xuerui c054f223e7 cmd/internal/obj/loong64: remove Optab.family and reorganize operand class fields
There is currently no support for GOARCH=loong32, so the Optab.family
field is unused so far. Remove it to simplify the optab; the loong
assembler backend would likely already be overhauled into a sufficiently
different shape by the time we start to care for loong32, that the data
we have today would be useless anyway.

While at it, add a operand class slot for the 3rd source operand
(support for which will arrive in later commits), and rename the other
operand class fields to be self-documenting. The changes are being
merged into this patch for sake of reducing code churn.

Change-Id: Icf0988e34ff1c0f762c8e0708cfcef2e7954760c
Reviewed-on: https://go-review.googlesource.com/c/go/+/477715
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
Run-TryBot: Ben Shi <powerman1st@163.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Wayne Zuo <wdvxdr@golangcn.org>
2023-03-31 02:57:51 +00:00
WANG Xuerui 22f9317f20 cmd/internal/obj/loong64: assemble BEQ/BNEs comparing with 0 as beqz/bnez
LoongArch (except for the extremely reduced LA32 Primary subset) has
dedicated beqz/bnez instructions as alternative encodings for beq/bne
with one of the source registers being R0, that allow the offset field
to occupy 5 more bits, giving 21 bits in total (equal to the FP
branches). Make use of them instead of beq/bne if one source operand is
omitted in asm, or if one of the registers being compared is R0.

Multiple go1 benchmark runs indicate the change is not perf-sensitive.

Change-Id: If6267623c82092e81d75578091fb4e013658b9f3
Reviewed-on: https://go-review.googlesource.com/c/go/+/478377
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
Run-TryBot: Ben Shi <powerman1st@163.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Wayne Zuo <wdvxdr@golangcn.org>
2023-03-31 02:56:19 +00:00
Johan Brandhorst-Satzkorn c5ccff405e cmd/dist: mark wasip1/wasm port as broken
Mark the wasip1/wasm port as broken until it has been fully merged.

Change-Id: I58592b43c82513b079c561673de99b41c94b11c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/480655
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
2023-03-30 19:38:44 +00:00
Johan Brandhorst-Satzkorn 8890c3a05f all: add wasip1 definitions
Add wasip1 GOOS definitions to the compiler and build
definitions.

Co-authored-by: Richard Musiol <neelance@gmail.com>
Co-authored-by: Achille Roussel <achille.roussel@gmail.com>
Co-authored-by: Julien Fabre <ju.pryz@gmail.com>
Co-authored-by: Evan Phoenix <evan@phx.io>
Change-Id: I087e7ff4205a34187bbca18b1693ad911ddd1219
Reviewed-on: https://go-review.googlesource.com/c/go/+/479616
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Auto-Submit: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
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2023-03-30 18:50:57 +00:00
Johan Brandhorst-Satzkorn ed9744dff5 cmd/compile: allow go:wasmimport in syscall
The go:wasmimport compiler directive is used by the wasi port
to access host APIs, some of need to implemented in the syscall
package.

Co-authored-by: Richard Musiol <neelance@gmail.com>
Co-authored-by: Achille Roussel <achille.roussel@gmail.com>
Co-authored-by: Julien Fabre <ju.pryz@gmail.com>
Co-authored-by: Evan Phoenix <evan@phx.io>
Change-Id: I3851e154c6989094effcd25bba5864faa133564e
Reviewed-on: https://go-review.googlesource.com/c/go/+/479615
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
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2023-03-30 18:50:54 +00:00
Bryan C. Mills 6615324f79 cmd/go: compute BuildInfo and EmbedFiles when listing export data
'go list -export' lists the locations of compiled artifacts,
so it needs to load all of the metadata needed to compile each package.

Fixes #58885.

Change-Id: Ie78527e0fb423698fb4195fe50e0b6925b05aa8c
Reviewed-on: https://go-review.googlesource.com/c/go/+/477197
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
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Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
2023-03-29 22:01:35 +00:00
Jeff Hodges 6e096e2fd5 cmd/go: change +build doc references to //go:build
This changes a few references to `+build` into the modern `//go:build`.
It was compiled by editing `cmd/go/internal/list/context.go`, running
`go test cmd/go -v -run=TestDocsUpToDate -fixdocs`, and then editing
list.go and build.go by hand.

Change-Id: I00fec55e098bf5100f5a186dd975a6628e15beb8
GitHub-Last-Rev: e0eb9be77e
GitHub-Pull-Request: golang/go#59245
Reviewed-on: https://go-review.googlesource.com/c/go/+/479417
Run-TryBot: Ian Lance Taylor <iant@google.com>
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2023-03-29 21:56:16 +00:00
Keith Randall 0d9eb8bea2 cmd/compile: casts from slices to array pointers are known to be non-nil
The cast is proceeded by a bounds check. If the bounds check passes
then we know the pointer in the slice is non-nil.

... except casts to pointers of 0-sized arrays. They are strange, as
the bounds check can pass for a nil input.

Change-Id: Ic01cf4a82d59fbe3071d4b271c94efca9cafaec1
Reviewed-on: https://go-review.googlesource.com/c/go/+/479335
Run-TryBot: Keith Randall <khr@golang.org>
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Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Auto-Submit: Keith Randall <khr@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2023-03-29 21:55:11 +00:00
Robert Griesemer 9c75c4b6d7 go/types, types2: adjust Check.funcInst signature
Per feedback from prior CL.

Change-Id: Icbf6149c3b61e26085caf6f368d22ad4f02c75fd
Reviewed-on: https://go-review.googlesource.com/c/go/+/480316
Reviewed-by: Robert Griesemer <gri@google.com>
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Reviewed-by: Robert Findley <rfindley@google.com>
2023-03-29 21:10:30 +00:00
Robert Griesemer f46ea60f2b go/types, types2: slightly tighter checks in Checker.use
Checker.use is called to check expressions and "use" variables
in case of an error. Use Checker.exprOrType instead of just
rawExpr.

Change-Id: I4da6fa51ef3b0c9b07c453494452836caced9b1a
Reviewed-on: https://go-review.googlesource.com/c/go/+/479897
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
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2023-03-29 20:53:12 +00:00
Robert Griesemer cc048b32f3 go/types, types2: reverse inference of function type arguments
This CL implements type inference for generic functions used in
assignments: variable init expressions, regular assignments, and
return statements, but (not yet) function arguments passed to
functions. For instance, given a generic function

        func f[P any](x P)

and a variable of function type

        var v func(x int)

the assignment

        v = f

is valid w/o explicit instantiation of f, and the missing type
argument for f is inferred from the type of v. More generally,
the function f may have multiple type arguments, and it may be
partially instantiated.

This new form of inference is not enabled by default (it needs
to go through the proposal process first). It can be enabled
by setting Config.EnableReverseTypeInference.

The mechanism is implemented as follows:

- The various expression evaluation functions take an additional
  (first) argument T, which is the target type for the expression.
  If not nil, it is the type of the LHS in an assignment.

- The method Checker.funcInst is changed such that it uses both,
  provided type arguments (if any), and a target type (if any)
  to augment type inference.

Change-Id: Idfde61078e1ee4f22abcca894a4c84d681734ff6
Reviewed-on: https://go-review.googlesource.com/c/go/+/476075
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2023-03-29 20:53:08 +00:00
qmuntal f57f02fcd5 cmd/link,cmd/internal/objabi: support ADDR32NB relocations on windows
This CL updates the linker to support
IMAGE_REL_[I386|AMD64|ARM|ARM64]_ADDR32NB relocations via the new
R_PEIMAGEOFF relocation type. This relocation type references symbols
using RVAs instead of VA, so it can use 4-byte offsets to reference
symbols that would normally require 8-byte offsets.

This new relocation is still not used, but will be useful when
generating Structured Exception Handling (SEH) metadata, which
needs to reference functions only using 4-byte addresses, thus
using RVAs instead of VA is of great help.

Updates #57302

Change-Id: I28d73e97d5cb78a3bc7194dc7d2fcb4a03f9f4d0
Reviewed-on: https://go-review.googlesource.com/c/go/+/461737
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Quim Muntal <quimmuntal@gmail.com>
Reviewed-by: Davis Goodin <dagood@microsoft.com>
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2023-03-29 05:01:03 +00:00
Robert Griesemer 91a40f43b6 go/types, types2: don't report assignment mismatch errors if there are other errors
Change the Checker.use/useLHS functions to report if all "used"
expressions evaluated without error. Use that information to
control whether to report an assignment mismatch error or not.
This will reduce the number of errors reported per assignment,
where the assignment mismatch is only one of the errors.

Change-Id: Ia0fc3203253b002e4e1d5759d8d5644999af6884
Reviewed-on: https://go-review.googlesource.com/c/go/+/478756
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
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2023-03-28 22:22:08 +00:00
Than McIntosh cd25a3a416 Revert "cmd/link: use path from "cc --print-prog-name ar" for c-archive buildmode"
This reverts commit https://go-review.git.corp.google.com/c/go/+/479775

Reason for revert: fails with ios-arm64-corellium builder

Change-Id: Iae61b994a39ff6c70af8a302f7a46de0097edf3e
Reviewed-on: https://go-review.googlesource.com/c/go/+/479917
Auto-Submit: Than McIntosh <thanm@google.com>
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2023-03-28 20:15:02 +00:00
Keith Randall 61bc17f04e cmd/compile: don't assume pointer of a slice is non-nil
unsafe.SliceData can return pointers which are nil. That function gets
lowered to the SSA OpSlicePtr, which the compiler assumes is non-nil.
This used to be the case as OpSlicePtr was only used in situations
where the bounds check already passed. But with unsafe.SliceData that
is no longer the case.

There are situations where we know it is nil. Use Bounded() to
indicate that.

I looked through all the uses of OSPTR and added SetBounded where it
made sense. Most OSPTR results are passed directly to runtime calls
(e.g. memmove), so even if we know they are non-nil that info isn't
helpful.

Fixes #59293

Change-Id: I437a15330db48e0082acfb1f89caf8c56723fc51
Reviewed-on: https://go-review.googlesource.com/c/go/+/479896
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Keith Randall <khr@google.com>
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2023-03-28 19:55:43 +00:00
Robert Griesemer 1742691270 go/types, types2: simplify Checker.exprList
Change-Id: I7e9e5bef9364afc959c66d9765180c4ed967f517
Reviewed-on: https://go-review.googlesource.com/c/go/+/478755
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2023-03-28 18:13:17 +00:00
Robert Griesemer a933d06271 go/types, types2: remove return values from Checker.assignVar/initVar
Not needed anymore.

Change-Id: I5229d556ba1625f53b9fa23b496c17138a92fc3e
Reviewed-on: https://go-review.googlesource.com/c/go/+/478717
Reviewed-by: Robert Griesemer <gri@google.com>
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2023-03-28 18:13:15 +00:00
Robert Griesemer 8c5e8a38df go/types, types2: refactor initVars
As with changes in prior CLs, we don't suppress legitimate
"declared but not used" errors anymore simply because the
respective variables are used in incorrect assignments,
unrelated to the variables in question.
Adjust several (ancient) tests accordingly.

Change-Id: I5826393264d9d8085c64777a330d4efeb735dd2d
Reviewed-on: https://go-review.googlesource.com/c/go/+/478716
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2023-03-28 18:13:13 +00:00
Than McIntosh 422f4483f1 cmd/link: use path from "cc --print-prog-name ar" for c-archive buildmode
When external linking with -buildmode=c-archive, the Go linker
eventually invokes the "ar" tool to create the final archive library.
Prior to this patch, if the '-extar' flag was not in use, we would
just run "ar". This works well in most cases but breaks down if we're
doing cross-compilation targeting Windows (macos system "ar"
apparently doesn't create the windows symdef section correctly). To
fix the problem, capture the output of "cc --print-prog-name ar" and
invoke "ar" using the path returned by that command.

Fixes #59221.

Change-Id: I9de66e98947c42633b16fde7208c2958d62fe7cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/479775
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2023-03-28 17:52:20 +00:00
Robert Griesemer c02e1bfbdb go/types, types2: refactor assignVars
Rather than using exprList and handle all cases together, split
apart the cases of n:n assignments and the cases of n:1 assignments.
For the former, the lhs types may (in a future CL) be used to infer
types on the rhs. This is a preparatory step.

Because the two cases are handled separately, the code is longer
(but also more explicit).

Some test cases were adjusted to avoifd (legitimate, but previously
supressed) "declared but not used" errors.

Change-Id: Ia43265f84e423b0ad5594612ba5a0ddce31a4a37
Reviewed-on: https://go-review.googlesource.com/c/go/+/478256
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2023-03-28 17:34:13 +00:00
Keith Randall 4237dea5e3 cmd/compile: lower priority of avoiding registers
We avoid allocating registers when we know they may have a fixed use
later (arg/return value, or the CX shift argument to SHRQ, etc.) But
it isn't worth avoiding that register if it requires moving another
register.

A move we may have to do later is not worth a move we definitely have
to do now.

Fixes #59288

Change-Id: Ibbdcbaea9caee0c5f3e0d6956a1a084ba89757a9
Reviewed-on: https://go-review.googlesource.com/c/go/+/479895
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2023-03-28 17:31:36 +00:00
Robert Griesemer 4c49d52439 go/types, types2: remove unnecessary tests for x.typ == Typ[Invalid]
In the worst case (x.mode != invalid but x.typ == Typ[Invalid]) we
may get unexpected additional errors; but we don't seem to have
any such situations, at least in the existing tests.

Change-Id: I86ae607b4ac9b926264bb6a967627c40e5a86ade
Reviewed-on: https://go-review.googlesource.com/c/go/+/478715
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2023-03-28 14:28:36 +00:00
Robert Griesemer abf9b112fd go/types, types2: more systematic use of Checker.use und useLHS
This CL re-introduces useLHS because we don't want to suppress
correct "declared but not used" errors for variables that only
appear on the LHS of an assignment (using Checker.use would mark
them as used).

This CL also adjusts a couple of places where types2 differed
from go/types (and suppressed valid "declared and not used"
errors). Now those errors are surfaced. Adjusted a handful of
tests accordingly.

Change-Id: Ia555139a05049887aeeec9e5221b1f41432c1a57
Reviewed-on: https://go-review.googlesource.com/c/go/+/478635
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2023-03-28 14:28:33 +00:00
Guoqi Chen 3ed8a1e629 cmd/internal/obj/loong64: save LR after decrementing SP
Refer to CL 413428 and 412474, for loong64, like mips, s390x and riscv, there
is no single instruction that saves the LR and decrements the SP, so we also
need to insert an instruction to save the LR after decrementing the SP.

Fixes #56623.
Updates #53374.

Change-Id: I3de040792f0a041d3d2a98ea89c23a2dd2f4ad10
Reviewed-on: https://go-review.googlesource.com/c/go/+/416154
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Reviewed-by: xiaodong liu <teaofmoli@gmail.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
Reviewed-by: Meidan Li <limeidan@loongson.cn>
2023-03-28 05:41:44 +00:00
WANG Xuerui 1ae306a5be cmd/internal/obj/loong64: clean up code for short conditional branches
Untangle the logic so the preparation of operands and actual assembling
(branch range checking included) are properly separated, making future
changes easier to review and maintain. No functional change intended.

Change-Id: I1f73282f9d92ff23d84846453d3597ba66d207d1
Reviewed-on: https://go-review.googlesource.com/c/go/+/478376
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
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2023-03-27 21:45:39 +00:00
Daniel Martí fc99c4b3f3 cmd/compile: start using reflect.Value.IsZero
We now require Go 1.17.13 to bootstrap via make.bash,
and since reflect.Value.IsZero was added in Go 1.13,
we can now use it directly to save a bit of copy pasting.

Change-Id: I77eef782cbbf86c72a4505c8b4866c9658914a24
Reviewed-on: https://go-review.googlesource.com/c/go/+/479395
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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2023-03-27 20:30:03 +00:00
Tobias Klauser ed1cf6ab3e cmd/link/internal/ld, internal/syscall/unix: use posix_fallocate on freebsd
The posix_fallocate system call is available since FreeBSD 9.0, see
https://man.freebsd.org/cgi/man.cgi?query=posix_fallocate

Change-Id: Ie65e0a44341909707617d3b0d9a4f1710c45b935
Reviewed-on: https://go-review.googlesource.com/c/go/+/478035
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2023-03-27 19:14:57 +00:00
Robert Griesemer bf9d9b7dba go/types, types2: better error message for some invalid integer array lengths
Don't say "array length must be integer" if it is in fact an integer.

Fixes #59209

Change-Id: If60b93a0418f5837ac334412d3838eec25eeb855
Reviewed-on: https://go-review.googlesource.com/c/go/+/479115
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2023-03-27 18:59:51 +00:00
Robert Griesemer 171850f169 cmd/compile: don't panic if unsafe.Sizeof/Offsetof is used with oversize types
In the Sizes API, recognize an overflow (to a negative value) as a
consequence of an oversize value, and specify as such in the API.

Adjust the various size computations to take overflow into account.

Recognize a negative size or offset as an error and report it rather
than panicking.

Use the same protocol for results provided by the default (StdSizes)
and external Sizes implementations.

Add a new error code TypeTooLarge for the new errors.

Fixes #59190.
Fixes #59207.

Change-Id: I8c33a9e69932760275100112dde627289ac7695b
Reviewed-on: https://go-review.googlesource.com/c/go/+/478919
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2023-03-27 16:52:49 +00:00
Robert Griesemer bd7b19356f go/types, types2: adjust Checker.recordCommaOkTypes signature
By changing the signature to accept a slice rather than an
array, we can avoid creating the array in the first place.

Functionally, we now also record comma-ok types if the
corresponding assignment was incorrect. But this change
provides more (not less) information through the API and
only so if the program is incorrect in the first place.

Change-Id: I0d629441f2f890a37912171fb26ef0e75827ce23
Reviewed-on: https://go-review.googlesource.com/c/go/+/478218
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2023-03-24 19:13:38 +00:00
Lynn Boger 2716dfd995 cmd/internal/obj/ppc64: fix incorrect base reg causing segv
This fixes a segv that was reported due to building minio. The
problem occurred because of an incorrect selection of the
base register, which was introduced by CL 306369.

Fixes #59196

Change-Id: Ieb77b2afa8fb4e6f3943df5ce138679f6750d376
Reviewed-on: https://go-review.googlesource.com/c/go/+/478920
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2023-03-24 18:14:29 +00:00
Cherry Mui a6c382eaa8 cmd/link: add padding after runtime.etext
The runtime.etext symbol is a marker symbol that marks the end of
(Go's) text section. Currently it has 0 size on some platforms.
Especially in external linking mode, this may cause the next
symbol (e.g. a C function) to have the same address as
runtime.etext, which may confuse some symbolizer. Add some padding
bytes to avoid address collision.

Change-Id: Ic450bab72e4ac79a3b6b891729831d4148b89234
Reviewed-on: https://go-review.googlesource.com/c/go/+/479075
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2023-03-24 14:23:19 +00:00
erifan01 42f99b203d cmd/compile: optimize cmp to cmn under conditions < and >= on arm64
Under the right conditions we can optimize cmp comparisons to cmn
comparisons, such as:
func foo(a, b int) int {
  var c int
  if a + b < 0 {
  	c = 1
  }
  return c
}

Previously it's compiled as:
  ADD     R1, R0, R1
  CMP     $0, R1
  CSET    LT, R0
With this CL it's compiled as:
  CMN     R1, R0
  CSET    MI, R0
Here we need to pay attention to the overflow situation of a+b, the MI
flag means N==1, which doesn't honor the overflow flag V, its value
depends only on the sign of the result. So it has the same semantic of
the Go code, so it's correct.

Similarly, this CL also optimizes the case of >= comparison
using the PL conditional flag.

Change-Id: I47179faba5b30cca84ea69bafa2ad5241bf6dfba
Reviewed-on: https://go-review.googlesource.com/c/go/+/476116
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2023-03-24 01:19:09 +00:00
erifan01 e81cc9119f cmd/compile: combine similar optimization rules on arm64
This CL combines some rules with the same structure.
In order to avoid extremely long rules, this CL does not merge some
rules. In addition, this CL aligned the components of some rules for
better reading.

Change-Id: I4ba1493251ace00b10591e3c8eef4b6277a4b226
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2023-03-24 01:18:58 +00:00
Michael Pratt b0dfcb7465 all: replace leading spaces with tabs in assembly
Most of these are one-off mistakes. Only one file was all spaces.

Change-Id: I277c3ce4a4811aa4248c90676f66bc775ae8d062
Reviewed-on: https://go-review.googlesource.com/c/go/+/478976
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2023-03-23 20:52:57 +00:00
Cherry Mui 0aa14fca8c cmd/go: enable -pgo=auto by default
Updates #58099.
Updates #55022.

Change-Id: I32eacdf9f008d16566e0b30230ecc25d110a9811
Reviewed-on: https://go-review.googlesource.com/c/go/+/474236
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2023-03-22 21:17:50 +00:00
Cherry Mui 3d28e0ebb9 cmd/go: permit "go list" error in some tests
The vendor_import test lists packages that are known bad (e.g.
bad.go, invalid.go). Pass -e to permit error.

The mod_vendor_auto test includes a package that imports a main
package, which should be an error. Pass -e to permit error.

Updates #59186.

Change-Id: I3b63025c3935f55feda1a95151d4c688d0394644
Reviewed-on: https://go-review.googlesource.com/c/go/+/477838
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2023-03-22 21:14:01 +00:00
Cherry Mui 65896f68fc cmd/go: make get_dash_t test more specific
Currently it uses "go list ...", which includes all packages in
the known universe, and may include unresolved dependencies. The
test for issue #8181 is specifically for that the test dependency
of package b is downloaded. Test that specifically.

Change-Id: Icfbd7e197698b10ae4bc7c8aa3b0f2c477ca6b8e
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2023-03-22 21:13:47 +00:00
Michael Matloob 4d9beb2052 cmd/go: use --ffile-prefix-map instead of --debug-prefix-map
Also add code to replace the vendor directory in the prefix-map in
vendored modules.  We weren't doing that before because in vendored
modules, the module's Dir field was set to empty, so nothing was being
replaced. Instead when Dir is not set, so we are in vendor mode,
replace the entire vendor directory's path.

Change-Id: I910499c74237699fd36d18049909a72e2b6705d9
Reviewed-on: https://go-review.googlesource.com/c/go/+/478455
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2023-03-22 19:56:37 +00:00
WANG Xuerui 09f1ddb158 cmd/internal/obj/loong64: realize all unconditional jumps with B/BL
The current practice of using the "PC-relative" `BEQ ZERO, ZERO` for
short jumps is inherited from the MIPS port, where the pre-R6 long
jumps are PC-regional instead of PC-relative. This quirk is not
present in LoongArch from the very beginning so there is no reason to
keep the behavior any more.

While at it, simplify the code to not place anything in the jump offset
field if a relocation is to take place. (It may be relic of a previous
REL-era treatment where the addend is to be stored in the instruction
word, but again, loong64 is exclusively RELA from day 1 so no point in
doing so either.)

Benchmark shows very slight improvement on a 3A5000 box, indicating the
LA464 micro-architecture presumably *not* seeing the always-true BEQs as
equivalent to B:

goos: linux
goarch: loong64
pkg: test/bench/go1
                      │  2ef70d9d0f  │                this CL                │
                      │    sec/op    │    sec/op     vs base                 │
BinaryTree17             14.57 ±  4%    14.54 ±  1%       ~ (p=0.353 n=10)
Fannkuch11               3.570 ±  0%    3.570 ±  0%       ~ (p=0.529 n=10)
FmtFprintfEmpty         92.84n ±  0%   92.84n ±  0%       ~ (p=0.970 n=10)
FmtFprintfString        150.0n ±  0%   149.9n ±  0%       ~ (p=0.350 n=10)
FmtFprintfInt           153.3n ±  0%   153.3n ±  0%       ~ (p=1.000 n=10) ¹
FmtFprintfIntInt        235.8n ±  0%   235.8n ±  0%       ~ (p=0.963 n=10)
FmtFprintfPrefixedInt   318.5n ±  0%   318.5n ±  0%       ~ (p=0.474 n=10)
FmtFprintfFloat         410.4n ±  0%   410.4n ±  0%       ~ (p=0.628 n=10)
FmtManyArgs             944.9n ±  0%   945.0n ±  0%       ~ (p=0.240 n=10)
GobDecode               13.97m ± 12%   12.83m ± 21%       ~ (p=0.165 n=10)
GobEncode               17.84m ±  5%   18.60m ±  4%       ~ (p=0.123 n=10)
Gzip                    421.0m ±  0%   421.0m ±  0%       ~ (p=0.579 n=10)
Gunzip                  89.80m ±  0%   89.77m ±  0%       ~ (p=0.529 n=10)
HTTPClientServer        86.54µ ±  1%   86.25µ ±  0%  -0.33% (p=0.003 n=10)
JSONEncode              18.57m ±  0%   18.57m ±  0%       ~ (p=0.353 n=10)
JSONDecode              77.48m ±  0%   77.30m ±  0%  -0.23% (p=0.035 n=10)
Mandelbrot200           7.217m ±  0%   7.217m ±  0%       ~ (p=0.436 n=10)
GoParse                 7.599m ±  2%   7.632m ±  1%       ~ (p=0.353 n=10)
RegexpMatchEasy0_32     140.1n ±  0%   140.1n ±  0%       ~ (p=0.582 n=10)
RegexpMatchEasy0_1K     1.538µ ±  0%   1.538µ ±  0%       ~ (p=1.000 n=10) ¹
RegexpMatchEasy1_32     161.7n ±  0%   161.7n ±  0%       ~ (p=1.000 n=10) ¹
RegexpMatchEasy1_1K     1.632µ ±  0%   1.632µ ±  0%       ~ (p=1.000 n=10) ¹
RegexpMatchMedium_32    1.369µ ±  0%   1.369µ ±  0%       ~ (p=1.000 n=10)
RegexpMatchMedium_1K    39.96µ ±  0%   39.96µ ±  0%  +0.01% (p=0.010 n=10)
RegexpMatchHard_32      2.099µ ±  0%   2.099µ ±  0%       ~ (p=1.000 n=10) ¹
RegexpMatchHard_1K      62.50µ ±  0%   62.50µ ±  0%       ~ (p=0.099 n=10)
Revcomp                  1.349 ±  0%    1.347 ±  0%  -0.14% (p=0.001 n=10)
Template                118.4m ±  0%   118.0m ±  0%  -0.36% (p=0.023 n=10)
TimeParse               407.8n ±  0%   407.9n ±  0%  +0.02% (p=0.000 n=10)
TimeFormat              508.0n ±  0%   507.9n ±  0%       ~ (p=0.421 n=10)
geomean                 103.5µ         103.3µ        -0.17%
¹ all samples are equal

                     │  2ef70d9d0f   │                this CL                 │
                     │      B/s      │      B/s       vs base                 │
GobDecode              52.67Mi ± 11%   57.04Mi ± 17%       ~ (p=0.149 n=10)
GobEncode              41.03Mi ±  4%   39.35Mi ±  4%       ~ (p=0.118 n=10)
Gzip                   43.95Mi ±  0%   43.95Mi ±  0%       ~ (p=0.428 n=10)
Gunzip                 206.1Mi ±  0%   206.1Mi ±  0%       ~ (p=0.399 n=10)
JSONEncode             99.64Mi ±  0%   99.66Mi ±  0%       ~ (p=0.304 n=10)
JSONDecode             23.88Mi ±  0%   23.94Mi ±  0%  +0.22% (p=0.030 n=10)
GoParse                7.267Mi ±  2%   7.238Mi ±  1%       ~ (p=0.360 n=10)
RegexpMatchEasy0_32    217.8Mi ±  0%   217.8Mi ±  0%  -0.00% (p=0.006 n=10)
RegexpMatchEasy0_1K    635.0Mi ±  0%   635.0Mi ±  0%       ~ (p=0.194 n=10)
RegexpMatchEasy1_32    188.7Mi ±  0%   188.7Mi ±  0%       ~ (p=0.338 n=10)
RegexpMatchEasy1_1K    598.5Mi ±  0%   598.5Mi ±  0%  -0.00% (p=0.000 n=10)
RegexpMatchMedium_32   22.30Mi ±  0%   22.30Mi ±  0%       ~ (p=0.211 n=10)
RegexpMatchMedium_1K   24.43Mi ±  0%   24.43Mi ±  0%       ~ (p=1.000 n=10)
RegexpMatchHard_32     14.54Mi ±  0%   14.54Mi ±  0%       ~ (p=0.474 n=10)
RegexpMatchHard_1K     15.62Mi ±  0%   15.62Mi ±  0%       ~ (p=1.000 n=10) ¹
Revcomp                179.7Mi ±  0%   180.0Mi ±  0%  +0.14% (p=0.001 n=10)
Template               15.63Mi ±  0%   15.68Mi ±  0%  +0.34% (p=0.022 n=10)
geomean                60.29Mi         60.44Mi        +0.24%
¹ all samples are equal

Change-Id: I112dd663c49567386ea75dd4966a9f8127ffb90e
Reviewed-on: https://go-review.googlesource.com/c/go/+/478075
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
2023-03-22 18:50:59 +00:00
Paul E. Murphy 7f4a54c0df cmd/internal/obj/ppc64: add VC[LT]ZLSBB instructions
These are ISA 3.0 power9 instructions which are helpful when reducing
a vector compare result into a GPR.

They are used in a future patch to improve the bytes.IndexByte asm
routine.

Change-Id: I424e2628e577167b9b7c0fcbd82099daf568ea35
Reviewed-on: https://go-review.googlesource.com/c/go/+/478115
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Run-TryBot: Paul Murphy <murp@ibm.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
2023-03-22 18:20:22 +00:00