Robert Griesemer [Fri, 25 Feb 2022 06:11:40 +0000 (22:11 -0800)]
go/types, types2: correctly consider ~ (tilde) in constraint type inference
When doing constraint type inference, we must consider whether the
constraint's core type is precise (no tilde) or imprecise (tilde,
or not a single specific type). In the latter case, we cannot infer
an unknown type argument from the (imprecise) core type because there
are infinitely many possible types. For instance, given
[E ~byte]
if we don't know E, we cannot infer that E must be byte (it could be
myByte, etc.). On the other hand, if we do know the type argument,
say for S in this example:
[S ~[]E, E any]
we must consider the underlying type of S when matching against ~[]E
because we have a tilde.
Because constraint type inference may infer type arguments that were
not eligible initially (because they were unknown and the core type
is imprecise), we must iterate the process until nothing changes any-
more. For instance, given
[S ~[]E, M ~map[string]S, E any]
where we initially only know the type argument for M, we must ignore
S (and E) at first. After one iteration of constraint type inference,
S is known at which point we can infer E as well.
The change is large-ish but the actual functional changes are small:
- There's a new method "unknowns" to determine the number of as of yet
unknown type arguments.
- The adjCoreType function has been adjusted to also return tilde
and single-type information. This is now conveniently returned
as (*term, bool), and the function has been renamed to coreTerm.
- The original constraint type inference loop has been adjusted to
consider tilde information.
- This adjusted original constraint type inference loop has been
nested in another loop for iteration, together with some minimal
logic to control termination.
The remaining changes are modifications to tests:
- There's a substantial new test for this issue.
- Several existing test cases were adjusted to accomodate the
fact that they inferred incorrect types: tildes have been
removed throughout. Most of these tests are for pathological
cases.
- A couple of tests were adjusted where there was a difference
between the go/types and types2 version.
Fixes #51229.
Change-Id: If0bf5fb70ec22913b5a2da89adbf8a27fbc921d9
Reviewed-on: https://go-review.googlesource.com/c/go/+/387977
Trust: Robert Griesemer <gri@golang.org>
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Keith Randall [Sun, 6 Feb 2022 17:43:39 +0000 (09:43 -0800)]
cmd/compile: include all entries in map literal hint size
Currently we only include static entries in the hint for sizing
the map when allocating a map for a map literal. Change that to
include all entries.
This will be an overallocation if the dynamic entries in the map have
equal keys, but equal keys in map literals are rare, and at worst we
waste a bit of space.
Cherry Mui [Tue, 1 Mar 2022 17:02:38 +0000 (12:02 -0500)]
cmd/compile: use AutogeneratedPos for method value wrapper
We use AutogeneratedPos for most compiler-generated functions. But
for method value wrappers we currently don't. Instead, we use the
Pos for their (direct) declaration if there is one, otherwise
not set it in methodValueWrapper, which will probably cause it to
inherit from the caller, i.e. the Pos of that method value
expression. If that Pos has inline information, it will cause the
method wrapper to have bogus inline information, which could lead
to infinite loop when printing a stack trace.
Change it to use AutogeneratedPos instead.
Fixes #51401.
Change-Id: I398dfe85f9f875e1fd82dc2f489dab63ada6570d
Reviewed-on: https://go-review.googlesource.com/c/go/+/388794
Trust: Cherry Mui <cherryyz@google.com>
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Matthew Dempsky [Tue, 1 Mar 2022 20:21:04 +0000 (12:21 -0800)]
test: workaround codegen bug in typeparam/mdempsky/13.go
This test case is failing on the noopt builder, because it disables
inlining. Evidently the explicit -gcflags flag in all of our generics
tests was overriding the noopt builder's default mode.
This CL restores a noop -gcflags to get the builder green again until
the issue can be properly fixed.
Updates #51413.
Change-Id: I61d22a007105f756104ba690b73f1d68ce4be281
Reviewed-on: https://go-review.googlesource.com/c/go/+/388894
Trust: Matthew Dempsky <mdempsky@google.com>
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ir.PkgName was only used by the old -G=0 frontend for representing
identifiers that refer to a package name. The new types2-based
frontends directly resolve the qualified identifier to the respective
object during IR construction.
Similarly, most of the ir.*Type nodes were only needed for
representing types in the IR prior to type checking. The new
types2-based frontends directly construct the corresponding types.Type
instead.
Exception: The internal typecheck.DeclFunc API used for
compiler-generated functions still depends on ir.FuncType, so that IR
node type is retained for now. (Eventually, we should update
typecheck.DeclFunc and callers to not depend on it, but it's not
urgent.)
Change-Id: I982f1bbd41eef5b42ce0f32676c7dc4a8ab6d0ee
Reviewed-on: https://go-review.googlesource.com/c/go/+/388538
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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The typechecking code for dealing with dot imports and redeclaration
errors can be removed, as these will now always be caught by types2
instead. Even when running the typecheck on internally constructed IR,
we'll never introduce new imports or redeclare identifiers.
Also, Func.Shortname (and typecheck.addmethod) was only used by the
-G=0 frontend. The new types2-based frontends directly associate
methods with their receiver type during IR construction.
Change-Id: I6578a448412141c87a0a53a6566639d9c00eeed7
Reviewed-on: https://go-review.googlesource.com/c/go/+/388537
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Trust: Matthew Dempsky <mdempsky@google.com> Reviewed-by: Keith Randall <khr@golang.org>
Keith Randall [Tue, 7 Dec 2021 17:22:33 +0000 (09:22 -0800)]
runtime: improve work stealing randomness
For certain values of GOMAXPROCS, the current code is less random than
it looks. For example with GOMAXPROCS=12, there are 4 coprimes: 1 5 7 11.
That's bad, as 12 and 4 are not relatively prime. So if pos == 2, then we
always pick 7 as the inc. We want to pick pos and inc independently
at random.
Change-Id: I5c7e4f01f9223cbc2db12a685dc0bced2cf39abf
Reviewed-on: https://go-review.googlesource.com/c/go/+/369976
Run-TryBot: Keith Randall <khr@golang.org>
Trust: Keith Randall <khr@golang.org>
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Matthew Dempsky [Fri, 11 Feb 2022 19:55:27 +0000 (11:55 -0800)]
cmd/compile: remove unified IR quirks mode
Unified IR quirks mode existed to help bootstrap unified IR by forcing
it to produce bit-for-bit identical output to the original gc noder
and typechecker. However, I believe it's far enough along now to stand
on its own, plus we have good test coverage of generics already for
-G=3 mode.
Change-Id: I8bf412c8bb5d720eadeac3fe31f49dc73679da70
Reviewed-on: https://go-review.googlesource.com/c/go/+/385998
Trust: Matthew Dempsky <mdempsky@google.com>
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Carlos Amedee [Mon, 28 Feb 2022 15:54:32 +0000 (10:54 -0500)]
internal/goversion: update Version to 1.19
This is the start of the Go 1.19 development cycle, so update the
Version value accordingly. It represents the Go 1.x version that will
soon open up for development (and eventually become released).
Updates #40705
Updates #51336
Change-Id: Ic4b3f2c04b1fa5c588cb6d62e829f2ed1864e511
Reviewed-on: https://go-review.googlesource.com/c/go/+/388376
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Michael Matloob [Mon, 28 Feb 2022 21:39:28 +0000 (16:39 -0500)]
cmd/go: make work and work_edit script tests version-independent
The work and work_edit script tests ran go work init, which put the
current Go version into the go.work files. Before this change, the tests
used cmp to compare the outputs with a file that contained a literal
"go 1.18" line. Instead, use cmpenv so we can compare with
"go $goversion". (Some of the test cases still compare against files
that contain "go 1.18" lines, but these tests explicitly set the version
to go 1.18 either in the original go.work files or using go work edit.)
Change-Id: Iea2caa7697b5fe5939070558b1664f70130095ce
Reviewed-on: https://go-review.googlesource.com/c/go/+/388514
Trust: Michael Matloob <matloob@golang.org>
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Robert Griesemer [Mon, 28 Feb 2022 02:13:23 +0000 (18:13 -0800)]
go/types, types2: fix string to type parameter conversions
Converting an untyped constant to a type parameter results
in a non-constant value; but the constant must still be
representable by all specific types of the type parameter.
Adjust the special handling for constant-to-type parameter
conversions to also include string-to-[]byte and []rune
conversions, which are handled separately for conversions
to types that are not type parameters because those are not
constant conversions in non-generic code.
Fixes #51386.
Change-Id: I15e5a0fd281efd15af387280cd3dee320a1ac5e1
Reviewed-on: https://go-review.googlesource.com/c/go/+/388254
Trust: Robert Griesemer <gri@golang.org> Reviewed-by: Robert Findley <rfindley@google.com>
Dan Scales [Wed, 23 Feb 2022 05:41:43 +0000 (21:41 -0800)]
cmd/compile: deal with constructed types that have shapes in them
We convert type args to shape types inside instantiations. If an
instantiation constructs a compound type based on that shape type and
uses that as a type arg to another generic function being called, then
we have a type arg with a shape type embedded inside of it. In that
case, we need to substitute out those embedded shape types with their
underlying type.
If we don't do this, we may create extra unneeded shape types that
have these other shape types embedded in them. This may lead to
generating extra shape instantiations, and a mismatch between the
instantiations that we used in generating dictionaries and the
instantations that are actually called.
Updates #51303
Change-Id: Ieef894a5fac176cfd1415f95926086277ad09759
Reviewed-on: https://go-review.googlesource.com/c/go/+/387674 Reviewed-by: Keith Randall <khr@golang.org>
Trust: Dan Scales <danscales@google.com>
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Cherry Mui [Fri, 18 Feb 2022 18:09:54 +0000 (13:09 -0500)]
runtime: avoid cgo_unsafe_args for syscall.syscall functions on darwin/arm64
Currently, syscall.syscall-like functions are defined as
cgo_unsafe_args, which makes them ABI0, as it takes the address of
the argument area based on ABI0 layout. Those functions are
linkname'd to the syscall package. When compiling the syscall
package, the compiler doesn't know they are ABI0 therefore
generate an ABIInternal call, which will use the wrapper. As some
of the functions (e.g. syscall6) has many arguments, the wrapper
would take a good amount of stack space. And those functions must
be nosplit. This causes nosplit overflow when building with -N -l
and -race.
Avoid that by rewriting the functions to not use cgo_unsafe_args.
Instead, make a struct locally and pass the address of that
struct. This way the functions are ABIInternal and the call will
not use the wrapper.
Fixes #51247.
Change-Id: I76c1ab86b9d28664fa7d5b9c7928fbb2fd8d1417
Reviewed-on: https://go-review.googlesource.com/c/go/+/386719
Trust: Cherry Mui <cherryyz@google.com>
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Dan Scales [Fri, 25 Feb 2022 22:56:04 +0000 (14:56 -0800)]
cmd/compile: fix case for structural types where we should be looking at typeparams
In getInstantiation, we were not computing tparams correctly for the
case where the receiver of a method was a fully-instantiated type. This
wasn't affecting later parts of the function, since method
instantiations of fully-instantiated types were already being calculated
in an earlier path. But it did give us a non-typeparam when trying to
see if a shape was associated with a type param with a structural type.
The fix is just to get the typeparams associated with the base generic
type. Then we can eliminate a conditional check later in the code.
The tparam parameter of Shapify should always be non-nil
Fixes #51367
Change-Id: I6f95fe603886148b2dad0c581416c51373c85009
Reviewed-on: https://go-review.googlesource.com/c/go/+/388116
Trust: Dan Scales <danscales@google.com>
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Keith Randall [Sat, 26 Feb 2022 00:06:53 +0000 (16:06 -0800)]
cmd/compile: emit types of constants which are instantiated generic types
Normally types of constants are emitted when the type is defined (an
ODCLTYPE). However, the types of constants where the type is an
instantiated generic type made inside the constant declaration, do not
normally get emitted. But the DWARF processor in the linker wants
to see those types. So we emit them during stenciling.
Fixes #51245
Change-Id: I59f20f1d7b91501c9ac760cf839a354356331fc6
Reviewed-on: https://go-review.googlesource.com/c/go/+/388117
Trust: Keith Randall <khr@golang.org>
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Dan Scales [Thu, 24 Feb 2022 01:57:09 +0000 (17:57 -0800)]
test: add new test case for 51219 that triggers the types2 issue
The existing test for 51219 didn't actually trigger the types2 issue - I
hadn't been able to minimize the test case yet properly. This new test
case issue51219b.go now does trigger the types2 issue (it's only
slightly different).
Updates #51219
Change-Id: Iaba8144b4702ff4fefec86c899b8acef127b10dc
Reviewed-on: https://go-review.googlesource.com/c/go/+/387814
Trust: Dan Scales <danscales@google.com> Reviewed-by: Robert Findley <rfindley@google.com>
Keith Randall [Fri, 25 Feb 2022 23:10:24 +0000 (15:10 -0800)]
cmd/compile: ensure dictionary assignment statements are defining statements
The problem in 51355 is that escape analysis decided that the
dictionary variable was captured by reference instead of by value. We
want dictionaries to always be captured by value.
Escape analysis was confused because it saw what it thought was a
reassignment of the dictionary variable. In fact, it was the only
assignment, it just wasn't marked as the defining assignment. Fix
that.
Add an assert to make sure this stays true.
Fixes #51355
Change-Id: Ifd9342455fa107b113f5ff521a94cdbf1b8a7733
Reviewed-on: https://go-review.googlesource.com/c/go/+/388115
Trust: Keith Randall <khr@golang.org>
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Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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Robert Griesemer [Fri, 25 Feb 2022 19:10:44 +0000 (11:10 -0800)]
go/types, types2: report an error for x.sel where x is a built-in
In case of a selector expression x.sel where x is a built-in
we didn't report an error because the type of built-ins is
invalid and we surpress errors on operands of invalid types,
assuming that an error has been reported before.
Add a corresponding check for this case.
Review all places where we call Checker.exprOrType to ensure
(invalid) built-ins are reported.
Adjusted position for index error in types2.
Fixes #51360.
Change-Id: I24693819c729994ab79d31de8fa7bd370b3e8469
Reviewed-on: https://go-review.googlesource.com/c/go/+/388054
Trust: Robert Griesemer <gri@golang.org> Reviewed-by: Robert Findley <rfindley@google.com>
Robert Findley [Fri, 25 Feb 2022 23:20:12 +0000 (18:20 -0500)]
go/types,types2: revert documentation for Type.Underlying
In the dev.typeparams branch, the documentation for Type.Underlying was
updated with commentary about forwarding chains. This aspect of
Underlying should not be exposed to the user. Revert to the
documentation of Go 1.16.
Fixes #51036
Change-Id: I4b73d3908a88606314aab56540cca91c014dc426
Reviewed-on: https://go-review.googlesource.com/c/go/+/388036
Trust: Robert Findley <rfindley@google.com>
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Cherry Mui [Fri, 25 Feb 2022 04:31:53 +0000 (23:31 -0500)]
runtime/internal/atomic: set SP delta correctly for 64-bit atomic functions on ARM
64-bit atomic functions on ARM have the following structure:
- check if the address is 64-bit aligned, if not, prepare a frame
and call panicUnaligned
- tail call armXXX or goXXX depending on GOARM
The alignment check calls panicUnaligned after preparing a frame,
so the stack can be unwound. The call never returns, so the SP is
not set back. However, the assembler assigns SP delta following
the instruction stream order, not the control flow. So it leaves
a nonzero SP delta after the check, to the tail call instructions,
which is wrong because when they are executed the SP is not
decremented. This CL fixes this by adding the SP back (the
instruction never executes, just tells the assembler to set the
SP delta back).
Should fix #51353.
Change-Id: I976cb1cfb0e9008b13538765cbc7eea0c19c7130
Reviewed-on: https://go-review.googlesource.com/c/go/+/388014
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Robert Griesemer [Thu, 24 Feb 2022 21:35:16 +0000 (13:35 -0800)]
go/types, types2: delay receiver type validation
Delay validation of receiver type as it may cause premature expansion
of types the receiver type is dependent on. This was actually a TODO.
While the diff looks large-ish, the actual change is small: all the
receiver validation code has been moved inside the delayed function
body, and a couple of comments have been adjusted.
Fixes #51232.
Fixes #51233.
Change-Id: I44edf0ba615996266791724b832d81b9ccb8b435
Reviewed-on: https://go-review.googlesource.com/c/go/+/387918
Trust: Robert Griesemer <gri@golang.org>
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Robert Griesemer [Thu, 24 Feb 2022 23:45:11 +0000 (15:45 -0800)]
doc/go1.18: document method set limitation for method selectors
For #51183.
For #47694.
Change-Id: If47ae074c3cd9f73b2e7f6408749d9a7d56bd8d2
Reviewed-on: https://go-review.googlesource.com/c/go/+/387924
Trust: Robert Griesemer <gri@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
Robert Griesemer [Thu, 24 Feb 2022 05:43:06 +0000 (21:43 -0800)]
go/types, types2: method recv type parameter count must match base type parameter count
Check receiver type parameter count when type checking the method
signature and report a suitable error (don't rely on delayed
instantiation and possibly constraint type inference).
While at it, simplify blank name recoding and type bound rewriting.
Stop-gap measure to avoid crashes in the compiler.
Fixes #51339.
For #51343.
Change-Id: Idbe2d32d69b66573ca973339f8924b349d2bc9cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/387836
Trust: Robert Griesemer <gri@golang.org> Reviewed-by: David Chase <drchase@google.com> Reviewed-by: Robert Findley <rfindley@google.com>
Bryan C. Mills [Wed, 23 Feb 2022 16:55:08 +0000 (11:55 -0500)]
cmd/go: avoid +incompatible major versions if a go.mod file exists in a subdirectory for that version
Previous versions of the 'go' command would reject a pseudo-version
passed to 'go get' if that pseudo-version had a mismatched major
version and lacked a "+incompatible" suffix. However, they would
erroneously accept a version *with* a "+incompatible" suffix even if
the repo contained a vN/go.mod file for the same major version, and
would generate a "+incompatible" pseudo-version or version if the user
requested a tag, branch, or commit hash.
This change uniformly rejects "vN.…" without "+incompatible", and also
avoids resolving to "vN.…+incompatible", when vN/go.mod exists.
To maintain compatibility with existing go.mod files, it still accepts
"vN.…+incompatible" if the version is requested explicitly as such
and the repo root lacks a go.mod file.
Dan Scales [Mon, 1 Nov 2021 02:45:21 +0000 (19:45 -0700)]
cmd/compile: delay all call transforms if in a generic function
We changed to delaying all transforms of generic functions, since there
are so many complicated situations where type params can be used. We
missed changing so that all Call expressions(not just some) are delayed
if in a generic function. This changes to delaying all transforms on
calls in generic functions. Had to convert Call() to g.callExpr() (so we
can access g.delayTransform()). By always delaying transforms on calls
in generic functions, we actually simplify the code a bit both in
g.CallExpr() and stencil.go.
Fixes #51236
Change-Id: I0342c7995254082c4baf709b0b92a06ec14425e9
Reviewed-on: https://go-review.googlesource.com/c/go/+/386220 Reviewed-by: Keith Randall <khr@golang.org>
Trust: Dan Scales <danscales@google.com>
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Robert Griesemer [Sun, 20 Feb 2022 20:58:21 +0000 (12:58 -0800)]
go/types, types2: add "dynamic" flag to comparable predicate
A type implements a comparable interface only if the type
is statically known to be comparable. Specifically, a type
cannot contain (component) interfaces that are not statically
known to be comparable.
This CL adds a flag "dynamic" to the comparable predicate to
control whether interfaces are always (dynamically) comparable.
Set the flag to true when testing for (traditional) Go comparability;
set the flag to false when testing whether a type implements the
comparable interface.
Fixes #51257.
Change-Id: If22bc047ee59337deb2e7844b8f488d67e5c5530
Reviewed-on: https://go-review.googlesource.com/c/go/+/387055
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Robert Findley [Fri, 18 Feb 2022 14:19:47 +0000 (09:19 -0500)]
go/types: delete unnecessary slice construction
CL 374294 made our check for incorrect type parameters constraints
eager, but failed to remove the construction of the bounds slice, which
was no longer used.
Change-Id: Ib8778fba947ef8a8414803e95d72c49b8f75c204
Reviewed-on: https://go-review.googlesource.com/c/go/+/386717
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Martin Sucha [Tue, 22 Feb 2022 20:51:04 +0000 (21:51 +0100)]
net: document methods of Buffers
There is code in the wild that copies the Buffers slice,
but not the contents.
Let's document explicitly that it is not safe to do so.
Updates #45163
Change-Id: Id45e27b93037d4e9f2bfde2558e7869983b60bcf
Reviewed-on: https://go-review.googlesource.com/c/go/+/387434 Reviewed-by: Ian Lance Taylor <iant@golang.org>
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Cherry Mui [Tue, 22 Feb 2022 17:54:57 +0000 (12:54 -0500)]
doc/go1.18: correct "go build -asan" HTML tag
The tag was "go-mod-vendor", which doesn't match the content.
Also move that section later, so "go mod" sections stay together.
For #47694.
Change-Id: Id4fa7ee0768682a9aadfeb1b2f1d723e7521896b
Reviewed-on: https://go-review.googlesource.com/c/go/+/387354
Trust: Cherry Mui <cherryyz@google.com> Reviewed-by: Ian Lance Taylor <iant@golang.org>
Russ Cox [Tue, 22 Feb 2022 14:05:21 +0000 (09:05 -0500)]
crypto/x509, runtime: fix occasional spurious “certificate is expired”
As documented in #51209, we have been seeing a low-rate failure
on macOS builders caused by spurious x509 “certificate is expired” errors.
The root cause is that CFDateCreate takes a float64, but it is being
passed a uintptr instead. That is, we're not even putting CFDateCreate's
argument in the right register during the call. Luckily, having just
computed the argument by calling time.Duration.Seconds, which
returns a float64, most of the time the argument we want is still
in the right floating point register, somewhat accidentally.
The only time the lucky accident doesn't happen is when the goroutine
is rescheduled between calling time.Duration.Seconds and calling
into CFDateCreate *and* the rescheduling smashes the floating point
register, which can happen during various block memory moves,
since the floating point registers are also the SIMD registers.
Passing the float64 through explicitly eliminates the problem.
It is difficult to write a test for this that is suitable for inclusion
in the standard library. We will have to rely on the builders to
start flaking again if somehow this problem is reintroduced.
For future reference, there is a standalone test that used to fail
every few seconds at https://go.dev/play/p/OWfDpxgnW9g.
Alberto Donizetti [Sat, 19 Feb 2022 17:13:52 +0000 (18:13 +0100)]
doc/go1.18: fix a few small typos, add a few commas
Updates #47694
Change-Id: I6c1c3698fdd55fe83c756f28776d1d26dba0a9df
Reviewed-on: https://go-review.googlesource.com/c/go/+/386974
Trust: Alberto Donizetti <alb.donizetti@gmail.com> Reviewed-by: Ian Lance Taylor <iant@golang.org>
hopehook [Sun, 13 Feb 2022 14:03:56 +0000 (22:03 +0800)]
encoding/xml: embedded reference to substruct causes XML marshaller to panic on encoding
When encoding a xml attribute is zero value (IsValid == false), we need
a `continue` to jump over the attribute. If not, followed marshalAttr
function will panic.
Fixes: #50164
Change-Id: I42e064558e7becfbf47728b14cbf5c7afa1e8798
Reviewed-on: https://go-review.googlesource.com/c/go/+/385514 Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
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>
hopehook [Sat, 19 Feb 2022 04:33:16 +0000 (12:33 +0800)]
testdata: fix typo in comment
Change-Id: If3d5884d9f3f32606c510af5597529b832a8f4a9
Reviewed-on: https://go-review.googlesource.com/c/go/+/386934 Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
George Looshch [Sat, 15 Jan 2022 19:43:05 +0000 (21:43 +0200)]
strings: fix typo in comment
Remove unnecessary whitespace in noescape comment
Fixes #50634
Change-Id: I1c8d16c020b05678577d349470fac7e7ab8a10b7
Reviewed-on: https://go-review.googlesource.com/c/go/+/378815 Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Cherry Mui [Fri, 18 Feb 2022 00:43:49 +0000 (19:43 -0500)]
runtime: define racefuncenter and racefuncexit as ABIInternal
They are called from compiler instrumented code as ABIInternal.
Define them as ABIInternal to avoid the wrappers and save some
stack space, to avoid nosplit overflow in -race -N -l build.
For #51247.
Change-Id: Iadad7d6da8ac03780a7b02b03b004c52d34e020a
Reviewed-on: https://go-review.googlesource.com/c/go/+/386715
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
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Dan Scales [Thu, 17 Feb 2022 04:11:52 +0000 (20:11 -0800)]
cmd/compile: fix importers to deal with recursion through type constraints
The code for issue #51219 reveals bugs in the types1 and types2
importers that can occur for recursive types that are recursive through
the type constraint.
The crash in the issue is caused by the types1 bug, which leads to the
production of a type1 type which is incomplete and improperly has the
HasTParam flag set. The bug in the types1 importer is that we were not
deferring type instantiations when reading the type parameters, but we
need to do that exactly to correctly handle recursion through the type
constraint. So, the fix is to move the start of the deferrals (in the
'U' section of doDecl in typecheck/iimport.go) above the code that reads
the type params.
Once that bug is fixed, the test still crashes due to a related types2
importer issues. The problem is that t.SetConstraint(c) requires c to be
fully constructed (have its underlying type set). Since that may not be
done yet in the 'U' case in (*importReader).obj() in
importer/iimport.go, we need to defer the call to SetConstraint() in
that case, until we are done importing all the types.
I added a test case with recursion through a type constraint that causes
a problem that is fixed by the types1 importer change, though the error
is not the same as in the issue. I added more types in the test case
(which try to imitate the issue types more closely) the types2 bug, but
wasn't able to cause it yet with the smaller test case.
Fixes #51219
Change-Id: I85d860c98c09dddc37f76ce87a78a6015ec6fd20
Reviewed-on: https://go-review.googlesource.com/c/go/+/386335 Reviewed-by: Matthew Dempsky <mdempsky@google.com> Reviewed-by: Robert Findley <rfindley@google.com>
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Dan Scales <danscales@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Bryan C. Mills [Wed, 16 Feb 2022 15:24:42 +0000 (10:24 -0500)]
os: eliminate arbitrary sleep in Kill tests
The test spawned a subprocess that arbitrarily slept for one second.
However, on some platforms, longer than one second may elapse between
starting the subprocess and sending the termination signal.
Instead, the subprocess now closes stdout and reads stdin until EOF,
eliminating the need for an arbitrary duration. (If the parent test
times out, the stdin pipe will break, so the subprocess still won't
leak forever.)
This also makes the test much faster in the typical case: since it
uses synchronization instead of sleeping, it can run as quickly as the
host OS can start and kill the process.
Bryan C. Mills [Wed, 16 Feb 2022 17:33:17 +0000 (12:33 -0500)]
cmd/go/internal/modload: set errors for packages with invalid import paths
Prior to CL 339170, relative errors in module mode resulted in a
base.Fatalf from the module loader, which caused unrecoverable errors
from 'go list -e' but successfully rejected relative imports (which
were never intended to work in module mode in the first place).
After that CL, the base.Fatalf is no longer present, but some errors
that had triggered that base.Fatalf were no longer diagnosed at all:
the module loader left them for the package loader to report, and the
package loader assumed that the module loader would report them.
Since the module loader already knows that the paths are invalid,
it now reports those errors itself.
Michael Matloob [Tue, 15 Feb 2022 19:27:13 +0000 (14:27 -0500)]
cmd/go: set go.work path using GOWORK, and remove -workfile flag
This change removes the -workfile flag and allows the go.work file path
to be set using GOWORK (which was previously read-only). This removes
the potential discrepancy and confusion between the flag and environment
variable.
GOWORK will still return the actual path of the go.work file found if it
is set to '' or 'auto'. GOWORK will return 'off' if it is set to 'off'.
For #45713
Fixes #51171
Change-Id: I72eed65d47c63c81433f2b54158d514daeaa1ab3
Reviewed-on: https://go-review.googlesource.com/c/go/+/385995
Trust: Michael Matloob <matloob@golang.org>
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Bryan Mills <bcmills@google.com>
Ian Lance Taylor [Thu, 27 Jan 2022 00:19:47 +0000 (16:19 -0800)]
time: document that Parse truncates to nanosecond precision
For #48685
Fixes #50806
Change-Id: Ie8be40e5794c0998538890a651ef8ec92cb72d3a
Reviewed-on: https://go-review.googlesource.com/c/go/+/381155
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Ian Lance Taylor [Tue, 15 Feb 2022 21:40:49 +0000 (13:40 -0800)]
net: increase maximum accepted DNS packet to 1232 bytes
The existing value of 512 bytes as is specified by RFC 1035.
However, the WSL resolver reportedly sends larger packets without
setting the truncation bit, which breaks using the Go resolver.
For 1.18 and backports, just increase the accepted packet size.
This is what GNU glibc does (they use 65536 bytes).
For 1.19 we plan to use EDNS to set the accepted packet size.
That will give us more time to test whether that causes any problems.
No test because I'm not sure how to write one and it wouldn't really
be useful anyhow.
Fixes #6464
Fixes #21160
Fixes #44135
Fixes #51127
For #51153
Change-Id: I0243f274a06e010ebb714e138a65386086aecf17
Reviewed-on: https://go-review.googlesource.com/c/go/+/386015
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by: Damien Neil <dneil@google.com> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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Ian Lance Taylor [Tue, 15 Feb 2022 21:38:57 +0000 (13:38 -0800)]
Revert "net: send EDNS(0) packet length in DNS query"
This reverts https://go.dev/cl/385035. For 1.18 we will use a simple
change to increase the accepted DNS packet size, to handle what appear
to be broken resolvers that don't honor the 512 byte limit. For 1.19
we will restore CL 385035 to make a proper EDNS request, so that it
has more testing time before it goes out in a release.
For #6464
For #21160
For #44135
For #51127
For #51153
Change-Id: Ie4a0eb85ca0a6a73bee5cd4cfc6b7d2a15ef259f
Reviewed-on: https://go-review.googlesource.com/c/go/+/386014
Trust: Ian Lance Taylor <iant@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com> Reviewed-by: Damien Neil <dneil@google.com>
alex.schade [Tue, 15 Feb 2022 15:35:03 +0000 (15:35 +0000)]
cmd/go/internal/modfetch: avoid leaking a lockedfile.File in case of write errors
The go modules download command has a method called hashZip which checks the
hash of a zipped directory versus an expected value, and then writes it out
to a file. In the event that the write operation is not successful, we do
not close the file, leading to it being leaked. This could happen if the
user runs out of disk space, causing the underlying OS write command to
return an error. Ultimately, this led to a panic in lockfile.OpenFile which
was invoked from a finalizer garbage collecting the leaked file. The result
was a stack trace that didn't show the call stack from where the write
operation actually failed.
Michael Pratt [Fri, 4 Feb 2022 22:15:28 +0000 (17:15 -0500)]
runtime, syscall: reimplement AllThreadsSyscall using only signals.
In issue 50113, we see that a thread blocked in a system call can result
in a hang of AllThreadsSyscall. To resolve this, we must send a signal
to these threads to knock them out of the system call long enough to run
the per-thread syscall.
Stepping back, if we need to send signals anyway, it should be possible
to implement this entire mechanism on top of signals. This CL does so,
vastly simplifying the mechanism, both as a direct result of
newly-unnecessary code as well as some ancillary simplifications to make
things simpler to follow.
Major changes:
* The rest of the mechanism is moved to os_linux.go, with fields in mOS
instead of m itself.
* 'Fixup' fields and functions are renamed to 'perThreadSyscall' so they
are more precise about their purpose.
* Rather than getting passed a closure, doAllThreadsSyscall takes the
syscall number and arguments. This avoids a lot of hairy behavior:
* The closure may potentially only be live in fields in the M,
hidden from the GC. Not necessary with no closure.
* The need to loan out the race context. A direct RawSyscall6 call
does not require any race context.
* The closure previously conditionally panicked in strange
locations, like a signal handler. Now we simply throw.
* All manual fixup synchronization with mPark, sysmon, templateThread,
sigqueue, etc is gone. The core approach is much simpler:
doAllThreadsSyscall sends a signal to every thread in allm, which
executes the system call from the signal handler. We use (SIGRTMIN +
1), aka SIGSETXID, the same signal used by glibc for this purpose. As
such, we are careful to only handle this signal on non-cgo binaries.
Synchronization with thread creation is a key part of this CL. The
comment near the top of doAllThreadsSyscall describes the required
synchronization semantics and how they are achieved.
Note that current use of allocmLock protects the state mutations of allm
that are also protected by sched.lock. allocmLock is used instead of
sched.lock simply to avoid holding sched.lock for so long.
Fixes #50113
Change-Id: Ic7ea856dc66cf711731540a54996e08fc986ce84
Reviewed-on: https://go-review.googlesource.com/c/go/+/383434 Reviewed-by: Austin Clements <austin@google.com>
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Michael Pratt [Tue, 8 Feb 2022 21:45:14 +0000 (16:45 -0500)]
runtime/internal/syscall: new package for linux
Add a generic syscall package for use by the runtime. Eventually we'd
like to clean up system calls in the runtime to use more code generation
and be moved out of the main runtime package.
The implementations of the assembly functions are based on copies of
syscall.RawSyscall6, modified slightly for more consistency between
arches. e.g., renamed trap to num, always set syscall num register
first.
For now, this package is just the bare minimum needed for
doAllThreadsSyscall to make an arbitrary syscall.
For #51087.
For #50113.
Change-Id: Ibecb5e6303279ce15286759e1cd6a2ddc52f7c72
Reviewed-on: https://go-review.googlesource.com/c/go/+/383999
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Austin Clements <austin@google.com>
Michael Pratt [Mon, 7 Feb 2022 22:02:57 +0000 (17:02 -0500)]
runtime: move doAllThreadsSyscall to os_linux.go
syscall_runtime_doAllThreadsSyscall is only used on Linux. In
preparation of a follow-up CL that will modify the function to use other
Linux-only functions, move it to os_linux.go with no changes.
For #50113.
Change-Id: I348b6130038603aa0a917be1f1debbca5a5a073f
Reviewed-on: https://go-review.googlesource.com/c/go/+/383996
Trust: Michael Pratt <mpratt@google.com> Reviewed-by: Andrew G. Morgan <agm@google.com> Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Robert Findley [Mon, 14 Feb 2022 03:48:39 +0000 (22:48 -0500)]
go/parser, go/printer: fix parsing of ambiguous type parameter lists
This is a port of CL 370774 to go/parser and go/printer. It is adjusted
for the slightly different factoring of parameter list parsing and
printing in go/parser and go/printer.
For #49482
Change-Id: I1c5b1facddbfcb7f7b2be356c817fc7e608223f1
Reviewed-on: https://go-review.googlesource.com/c/go/+/385575
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Keith Randall [Mon, 14 Feb 2022 22:57:55 +0000 (14:57 -0800)]
cmd/compile: drop column info when line number saturates
When line number saturates, we can end up getting non-monotonic
position info, because the start of the next line after line=lineMax,col=2
is line=lineMax,col=1.
Instead, if line==lineMax, make the column always 0 (no column info).
If the line number is wrong, having column info probably isn't that helpful.
Fixes #51193
Change-Id: If3d90472691b1f6163654f3505e2cb98467f2383
Reviewed-on: https://go-review.googlesource.com/c/go/+/385795
Trust: Keith Randall <khr@golang.org> Reviewed-by: Than McIntosh <thanm@google.com>
Bryan C. Mills [Fri, 11 Feb 2022 21:49:51 +0000 (16:49 -0500)]
net: in TestNotTemporaryRead, do not assume that a dialed connection has been accepted
Previously, TestNotTemporaryRead issued the Read on the Accept side of
the connection, and Closed the Dial side. It appears that on some
platforms, Dial may return before the connection has been Accepted,
and if that connection is immediately closed with no bytes written and
SO_LINGER set to 0, the connection may no longer even exist by the
time Accept returns, causing Accept to block indefinitely until the
Listener is closed.
If we were to just swap the directions, we would have an analogous
problem: Accept could accept the connection and close it before the
client even finishes dialing, causing Dial (instead of Read) to return
the ECONNRESET error.
Here, we take a middle path: we Accept and Dial the connection
concurrently, but wait until both the Accept and the Dial have
returned (indicating that the connection is completely established and
won't vanish from the accept queue) before resetting the connection.
Damien Neil [Wed, 19 Jan 2022 19:26:46 +0000 (11:26 -0800)]
net/http: deflake request-not-written path
When we receive an error writing the first byte of a request to a
reused connection, we retry the request on a new connection. Remove
a flaky path which could cause the request to not be retried if
persistConn.roundTrip reads the error caused by closing the connection
before it reads the write error that caused the connection to be
closed.
Robert Findley [Mon, 14 Feb 2022 01:27:55 +0000 (20:27 -0500)]
go/types, types2: no need to revert tparam renaming in inference results
This is a follow up to CL 385494. In early patch sets of that CL,
renamed type parameters were substituted in arguments, which meant that
they could leak into the inference results. However, we subsequently
realized that we could instead substitute in the signature parameters.
In this case it is not possible for the substituted type parameters to
appear in the resulting type arguments, so there is no need to
un-substitute.
Change-Id: I4da45b0b8d7ad809d0ddfa7061ae5f6f07895540
Reviewed-on: https://go-review.googlesource.com/c/go/+/385574
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org>
Robert Griesemer [Fri, 11 Feb 2022 20:18:33 +0000 (12:18 -0800)]
spec: highlight missing prose for easier review, fixed a few sections
The (temporary) highlights will make it easier to review the spec
in formatted form as opposed to html text.
Added a missing rule about the use of adjusted core types for
constraint type inference.
Adjusted rule for invalid embedding of interface types.
Change-Id: Ie573068d2307b66c937e803c486724175415b9c6
Reviewed-on: https://go-review.googlesource.com/c/go/+/385535
Trust: Robert Griesemer <gri@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
Type inference uses type parameter pointer identity to keep track of the
correspondence between type parameters and type arguments. However, this
technique can misidentify type parameters that are used in explicit type
arguments or function arguments, as in the recursive instantiation
below:
func f[P *Q, Q any](p P, q Q) {
f[P]
}
In this example, the fact that the P used in the instantation f[P] has
the same pointer identity as the P we are trying to solve for via
unification is coincidental: there is nothing special about recursive
calls that should cause them to conflate the identity of type arguments
with type parameters. To put it another way: any such self-recursive
call is equivalent to a mutually recursive call, which does not run into
any problems of type parameter identity. For example, the following code
is equivalent to the code above.
We can turn the first example into the second example by renaming type
parameters in the original signature to give them a new identity. This
CL does this for self-recursive instantiations.
Fixes #51158
Fixes #48656
Updates #48619
Change-Id: I54fe37f2a79c9d98950cf6a3602335db2896dc24
Reviewed-on: https://go-review.googlesource.com/c/go/+/385494
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com> Reviewed-by: Robert Griesemer <gri@golang.org>
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Ian Lance Taylor [Sat, 12 Feb 2022 22:16:51 +0000 (14:16 -0800)]
test: add notinheap test that caused a gofrontend crash
Change-Id: Ie949f2131845f9f9292caff798f6933648779122
Reviewed-on: https://go-review.googlesource.com/c/go/+/385434
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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type inference attempts to unify the types of m1 and m2. This leads
to the unification attempt of M1 and M2. The result is that the type
argument for M1 is inferred to be M2. Since there is no furter function
argument to use, constraint type inference attempts to infer the type
for K1 which is still missing. Constraint type inference (inferB in
the trace below) compares the inferred type for M1 (i.e., M2) against
map[K1]int. M2 is bound to f2, not f1; with the existing algorithm
that means M2 is simply a named type without further information.
Unification fails and with that type inference, and the type checker
reports an error.
With this change, when attempting to unify M2 with map[K1]int,
rather than failing, the unifier now considers the core type of
M2 which is map[K2]int. This leads to the unification of K1 and
K2; so type inference successfully infers M2 for M1 and K2 for K1.
The fix for this issue was provided by Rob Findley in CL 380375;
this change is a copy of that fix with some additional changes:
- Constraint type inference doesn't simply use a type parameter's
core type. Instead, if the type parameter type set consists of
a single, possibly named type, it uses that type. Factor out the
existing code into a new function adjCoreType. This change is not
strictly needed but makes it easier to think about the code.
- Tracing code is added for debugging type inference. All tracing
code is guarded with the flag traceEnabled which is set to false
by default.
- The change to the unification algorithm is guarded with the flag
enableCoreTypeUnification.
- The sprintf function has a new type switch case for lists of
type parameters. This is used for tracing output (and was also
missing for a panic that was printing type parameter lists).
Fixes #50755.
Change-Id: Ie50c8f4540fcd446a71b07e2b451a95339b530ce
Reviewed-on: https://go-review.googlesource.com/c/go/+/385354
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org> Reviewed-by: Robert Findley <rfindley@google.com>
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Ian Lance Taylor [Fri, 11 Feb 2022 04:09:07 +0000 (20:09 -0800)]
net: send EDNS(0) packet length in DNS query
We used to only accept up to 512 bytes in a DNS packet, per RFC 1035.
Increase the size we accept to 1232 bytes, per https://dnsflagday.net/2020/,
and advertise that larger limit in a EDNS(0) OPT record.
Change-Id: I496a294e9a8015de4161cbc1825b0dc5b4e9f5d8
Reviewed-on: https://go-review.googlesource.com/c/go/+/385035
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Robert Griesemer [Fri, 11 Feb 2022 21:16:52 +0000 (13:16 -0800)]
go/types, types2: better error message for invalid array length
If an invalid array length is just an identifier, mention
"array length" so that it's clear this is an invalid array
declaration and not a (invalid) generic type declaration.
Fixes #51145.
Change-Id: I8878cbb6c7b1277fc0a9a014712ec8d55499c5c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/385255
Trust: Robert Griesemer <gri@golang.org>
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Cherry Mui [Mon, 7 Feb 2022 17:00:44 +0000 (12:00 -0500)]
cmd/compile, runtime: use unwrapped PC for goroutine creation tracing
With the switch to the register ABI, we now generate wrapper
functions for go statements in many cases. A new goroutine's start
PC now points to the wrapper function. This does not affect
execution, but the runtime tracer uses the start PC and the
function name as the name/label of that goroutine. If the start
function is a named function, using the name of the wrapper loses
that information. Furthur, the tracer's goroutine view groups
goroutines by start PC. For multiple go statements with the same
callee, they are grouped together. With the wrappers, which is
context-dependent as it is a closure, they are no longer grouped.
This CL fixes the problem by providing the underlying unwrapped
PC for tracing. The compiler emits metadata to link the unwrapped
PC to the wrapper function. And the runtime reads that metadata
and record that unwrapped PC for tracing.
(This doesn't work for shared buildmode. Unfortunate.)
TODO: is there a way to test?
Fixes #50622.
Change-Id: Iaa20e1b544111c0255eb0fc04427aab7a5e3b877
Reviewed-on: https://go-review.googlesource.com/c/go/+/384158
Trust: Cherry Mui <cherryyz@google.com> Reviewed-by: Than McIntosh <thanm@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>