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49122 Commits

Author SHA1 Message Date
Dan Scales
8ab59d812a [dev.typeparams] cmd/compile: change export version to 1.17 for testing
This is a temporary change. We will revert this back before the 1.18
release. We make this change now to simplify testing, since a lot of
tools will break on the new export version.

Updates #47654.

Change-Id: I0650fa753bb11229c71254d779dd61b5c1af9cdf
Reviewed-on: https://go-review.googlesource.com/c/go/+/341211
Trust: Dan Scales <danscales@google.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2021-08-11 19:48:50 +00:00
Cherry Mui
d7d4f28a06 [dev.typeparams] runtime, internal/bytealg: remove regabi fallback code on AMD64
As we commit to always enabling register ABI on AMD64, remove the
fallback code.

Change-Id: I30556858ba4bac367495fa94f6a8682ecd771196
Reviewed-on: https://go-review.googlesource.com/c/go/+/341152
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Austin Clements <austin@google.com>
2021-08-11 17:08:54 +00:00
Cherry Mui
eeb7899137 [dev.typeparams] internal/buildcfg: always enable regabi on AMD64
In Go 1.17 we added register ABI on AMD64 on Linux/macOS/Windows
as a GOEXPERIMENT, on by default. In Go 1.18, we commit to always
enabling register ABI on AMD64.

Now "go build" for AMD64 always have goexperiment.regabi* tags
set. However, at bootstrapping cmd/dist does not set the tags
when building go_bootstrap. For this to work, unfortunately, we
need to hard-code AMD64 to use register ABI in runtime code.

Change-Id: I0b31e678e186b9cdeeb8502cd9e38ed0d7e72d4f
Reviewed-on: https://go-review.googlesource.com/c/go/+/341151
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Austin Clements <austin@google.com>
2021-08-11 16:59:43 +00:00
Ian Lance Taylor
d4c0ed26ac doc/go1.17: linker passes -I to extld as -Wl,--dynamic-linker
For #22446

Change-Id: I71a30761a28e81c50b7089d5a28be99c736c2dc8
Reviewed-on: https://go-review.googlesource.com/c/go/+/341332
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
2021-08-11 16:51:24 +00:00
Robert Griesemer
0888a8cd2d [dev.typeparams] cmd/compile/internal/types2: remove unused TypeParam.Bound method
Use TypeParam.Constraint instead.

Change-Id: Iebd77d304f2b7238baa231fb9869c964f66ea355
Reviewed-on: https://go-review.googlesource.com/c/go/+/340990
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
2021-08-11 06:15:15 +00:00
Rob Findley
7308d747e7 [dev.typeparams] cmd/compile/internal/types2: remove Named.SetTArgs
Calling SetTArgs without substituting can leave the type in incoherent
state, so we should avoid exposing this API unless necessary. Since it
is currently not used by the importer(s), it is probably not necessary
to expose for 1.18, so remove it.

Change-Id: I06bd7b5bbfacd3c65e2e66a9d5980f20cd1c10c1
Reviewed-on: https://go-review.googlesource.com/c/go/+/341290
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
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Reviewed-by: Robert Griesemer <gri@golang.org>
2021-08-10 21:52:02 +00:00
Rob Findley
0f34a92df7 [dev.typeparams] go/types: don't expose the TypeSet API for 1.18
The TypeSet API is very new and probably not necessary to expose outside
of go/types, at least for 1.18. Users can check whether a type is
contained within a type set via Implements, and can access the
representation of the type set via the embedded Unions.

Change-Id: Icc7355285785bee5aa7a8fe74052bcb0fedcd0a1
Reviewed-on: https://go-review.googlesource.com/c/go/+/341289
Trust: Robert Findley <rfindley@google.com>
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Reviewed-by: Robert Griesemer <gri@golang.org>
2021-08-10 21:49:07 +00:00
Dan Scales
40ba119e3f [dev.typeparams] cmd/compile: keep export format unchanged if no type params are exported
Added new export tags 'G' and 'U' to export parameterized
functions/methods and parameterized types respectively. This has the
advantage that the Go 1.18 format remains backward-compatible with the
Go 1.17 format if no type parameters are exported.

Change-Id: I9dba8faaa65609eb3f9c693bd0c79daee98bd865
Reviewed-on: https://go-review.googlesource.com/c/go/+/340989
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Dan Scales <danscales@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2021-08-10 19:48:58 +00:00
Cherry Mui
fb8579746c [dev.typeparams] internal/goexperiment: update comment for RegabiArgs requirements
RegabiG and regabiDefer have been always enabled and removed from
experiments. Update the comment.

Change-Id: Ieaf4b4f0a7e0e9d6733a18932ca457be4f150d08
Reviewed-on: https://go-review.googlesource.com/c/go/+/341150
Trust: Cherry Mui <cherryyz@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
2021-08-10 16:07:59 +00:00
Cherry Mui
2e250cc957 [dev.typeparams] cmd: update vendored golang.org/x/tools to 337cebd2c1
Update vendored golang.org/x/tools repo to pick up CL 339250 for
assembly function check for register ABI.

This is done with

	cd GOROOT/cmd
	go get golang.org/x/tools@master
	go mod tidy
	go mod vendor

Update cmd/vet tests as the error ouput changes in CL 301949.
The error message now includes full package-qualified name.

Change-Id: I52dc7223aee9e011214254488bacf02dc5b4c2ef
Reviewed-on: https://go-review.googlesource.com/c/go/+/341149
Trust: Cherry Mui <cherryyz@google.com>
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Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
2021-08-10 16:07:37 +00:00
Keith Randall
2fbf6aafe7 [dev.typeparams] cmd/compile: handle interface type parameters in type switches
Change-Id: I9bba21a64d7e9f42395b6fcdf8aa3ca01cf131dc
Reviewed-on: https://go-review.googlesource.com/c/go/+/340912
Trust: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
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Reviewed-by: Dan Scales <danscales@google.com>
2021-08-10 01:56:50 +00:00
Robert Griesemer
e4cfa2f6da [dev.typeparams] cmd/compile/internal/types2: parameterized functions must have a body
Add the respective check and add missing bodies to tests.
Use {} as body for functions that don't return a result.
Use { panic(0) } as body for functions that return a result.

For #47069.

Change-Id: Ia5d7525c9c036baf8a955d13bff448401e08235e
Reviewed-on: https://go-review.googlesource.com/c/go/+/340911
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
2021-08-10 01:20:34 +00:00
Robert Griesemer
508624f359 [dev.typeparams] cmd/compile/internal/types2: expand is only required for *Named types
Now that the pointer identity for a *Named type doesn't change
anymore when going from lazy instantiated to actually instantiated
(= expanded) state, expand() only needs to be called when we deal
with *Named types and only if we care about a *Named type's internals.

Remove the expand function and respective calls for all types and
replace with specific t.expand() method calls where t is a *Named.

Change-Id: If82299360d60108b00adc4013b29399aec90b940
Reviewed-on: https://go-review.googlesource.com/c/go/+/340749
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
2021-08-10 01:20:32 +00:00
fanzha02
1f9c9d8530 doc: use "high address/low address" instead of "top/bottom"
The current document uses the "top" and "bottom" when talking
about the address within a frame, which may easily lead to
misunderstandings. This patch directly uses "high address"
and "low address" to make the expression clearer.

Change-Id: I7469330bbdc158672d7f0314fe6680ebdd9ab79a
Reviewed-on: https://go-review.googlesource.com/c/go/+/339369
Trust: fannie zhang <Fannie.Zhang@arm.com>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
2021-08-10 01:13:06 +00:00
Dan Scales
f5f79c47f9 [dev.typeparams] cmd/compile: use types2.Constraint() rather than types2.Bound()
types2.Constraint() returns the top-level constraint type, including any
unions or other interface elements. Because of that, we needed to
add/fix some code in the type substituter and generic type instantiater
in the importer to deal with unions and non-method members of an
interface. Also, NewUnion was not correctly setting the HasTParam flag.

I also added a better error message when a symbol is not found in
(*deadcodePass).decodeIfaceMethod().

Change-Id: Id3668dc596dce63690fa05a9e5e42295b5e2bbb5
Reviewed-on: https://go-review.googlesource.com/c/go/+/340670
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Dan Scales <danscales@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
2021-08-09 20:08:06 +00:00
Jay Conrod
f1dce319ff cmd/go: with -mod=vendor, don't panic if there are duplicate requirements
In loadModFile with -mod=vendor, load the vendor list and use it to
initialize the module graph before calling updateRoots.

In updateLazyRoots with any mode other than "mod", return the original
*Requirements if no roots needed to be upgraded, even if there are
inconsistencies. This means 'go list -m -mod=readonly' and -mod=vendor
may succeed if there are duplicate requirements or requirements on
versions of the main module.

Fixes #47565

Change-Id: I4640dffc4a7359367cc910da0d29e3538bfd1ca4
Reviewed-on: https://go-review.googlesource.com/c/go/+/340252
Trust: Jay Conrod <jayconrod@google.com>
Trust: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2021-08-09 20:06:35 +00:00
Dan Scales
9f4d6a8359 [dev.typeparams] cmd/compile: call transformArgs before early typecheckaste in noder
In the cases where we do an early call to typecheckaste() in noder to
expose CONVIFACE nodes, we need a preceding call to transformArgs().
This is needed to allow typecheckaste() to run correctly, in the case of
f(g()), where g has multiple return values.

I also cleaned up the code a bit and commented the code in Call(), and
we do the call to typecheckaste() in several more cases.

In stencil.go:stencil(), I moved the transformCall earlier for the
OCALLMETH/ODOTMETH case, just as I did in my previous CL for
OCALL/OFUNCINST. By doing this, transformArgs no longer needs to deal
with the extra dictionary args. Therefore, I was able to simply
transformArgs() to look like typecheckargs() again, and make use of
RewriteMultiValue directly.

Updates #47514

Change-Id: I49eb82ac05707e50c2e2fb03e39458a70491d406
Reviewed-on: https://go-review.googlesource.com/c/go/+/340531
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Dan Scales <danscales@google.com>
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Reviewed-by: Keith Randall <khr@golang.org>
2021-08-09 19:43:09 +00:00
Keith Randall
ca3c6985cd [dev.typeparams] cmd/compile: implement generic type switches
Add a new dynamicType node, which is used as a case entry when
the type being switched to is generic.

Change-Id: Ice77c6f224b8fdd3ff574fdf4a8ea5f6c7ddbe75
Reviewed-on: https://go-review.googlesource.com/c/go/+/339429
Trust: Keith Randall <khr@golang.org>
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
2021-08-09 18:41:45 +00:00
Keith Randall
57668b84ff [dev.typeparams] cmd/compile: simplify interface conversions
Simplify the implementation of interface conversions in the compiler.
Don't pass fields that aren't needed (the data word, usually) to the runtime.

For generics, we need to put a dynamic type in an interface. The new
dataWord function is exactly what we need (the type word will come
from a dictionary).

Change-Id: Iade5de5c174854b65ad248f35c7893c603f7be3d
Reviewed-on: https://go-review.googlesource.com/c/go/+/340029
Trust: Keith Randall <khr@golang.org>
Trust: Dan Scales <danscales@google.com>
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Reviewed-by: Dan Scales <danscales@google.com>
2021-08-09 16:10:20 +00:00
Ian Lance Taylor
7aeaad5c86 runtime/cgo: when using msan explicitly unpoison cgoCallers
This avoids an incorrect msan uninitialized memory report when using
runtime.SetCgoTraceback when a signal occurs while the fifth argument
register is undefined. See the issue for more details.

Fixes #47543

Change-Id: I3d1b673e2c93471ccdae0171a99b88b5a6062840
Reviewed-on: https://go-review.googlesource.com/c/go/+/339902
Trust: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Austin Clements <austin@google.com>
2021-08-09 14:48:39 +00:00
Cuong Manh Le
507cc341ec doc: add example for conversion from slice expressions to array ptr
Fixes #47599

Change-Id: I8f4ccd3b0c2bcdb057ee853163b4421229141333
Reviewed-on: https://go-review.googlesource.com/c/go/+/340351
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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2021-08-08 18:37:08 +00:00
Dan Scales
d10a904712 [dev.typeparams] cmd/compile: don't export/import type parameter indices anymore
types2 now determines type parameter indices lazily, so we don't need
them just as we are importing. We set them in types1 as we are importing
the type param list itself.

type param indices are not strongly needed in types1 - we only use them
in one place which could be rewritten. But I kept them in analogy to
types2 (TypeParam.Index).

Fixes #47451

Change-Id: I30631f95c45a259354eaf7ec5194f71e799eb358
Reviewed-on: https://go-review.googlesource.com/c/go/+/340532
Run-TryBot: Dan Scales <danscales@google.com>
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Trust: Dan Scales <danscales@google.com>
2021-08-07 06:00:09 +00:00
Bryan C. Mills
891547e2d4 doc/go1.17: fix a typo introduced in CL 335135
Change-Id: I62388bcb6d6f910ffa95d3db856ea29838573256
Reviewed-on: https://go-review.googlesource.com/c/go/+/340590
Trust: Bryan C. Mills <bcmills@google.com>
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2021-08-07 01:29:22 +00:00
Cherry Mui
8eaf4d16bc make.bash: do not overwrite GO_LDSO if already set
Change-Id: I704bdb411bda3d8a40906c12f182e268dca4718f
Reviewed-on: https://go-review.googlesource.com/c/go/+/340450
Trust: Cherry Mui <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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2021-08-06 22:33:46 +00:00
Bryan C. Mills
63b968f4f8 doc/go1.17: clarify Modules changes
Writing CL 333629 clarified my thinking about the behavioral changes
associated with lazy loading. There are really two interrelated
changes — graph pruning, and lazy loading proper — that are both made
possible by the added redundancy in the go.mod file.

(I had initially approached the whole cluster of features as “lazy
loading” because that was the starting point for the design. Graph
pruning came into the picture when we looked at how to bound the
worst-case behavior of lazy loading, but it is really the more
important of the two aspects of the design.)

Note that this change adds links to doc anchors added in CL 333629.

Fixes #36460
Fixes #47397

Change-Id: I0ef4af57f647bf5ee210ea7099191fb4befa2cc1
Reviewed-on: https://go-review.googlesource.com/c/go/+/335135
Trust: Bryan C. Mills <bcmills@google.com>
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2021-08-06 20:44:03 +00:00
Robert Griesemer
9e0ac72d68 [dev.typeparams] cmd/compile/internal/types2: remove Interface.Complete (cleanup)
Interface.Complete is not needed anymore. We can remove it in
types2 (and eventually make it an empty function in go/types,
where we must maintain the existing API).

Change-Id: I689f0d6f3a83997d8ca5bae773b9af0083d0bf4f
Reviewed-on: https://go-review.googlesource.com/c/go/+/340255
Trust: Robert Griesemer <gri@golang.org>
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2021-08-06 20:34:54 +00:00
Robert Griesemer
9bd1817e41 [dev.typeparams] cmd/compile/internal/types2: limit termlist lengths
At the moment, operations on termlists are O(n^2).
This is fine for normal-sized unions, but overlong
termlist lenghts will lead to excessive type checking
times.

Limit the length of termlists to avoid "compilations
that don't finish".

Change-Id: I39a7fc61b01c9db06faeb49a0e014b1ede532710
Reviewed-on: https://go-review.googlesource.com/c/go/+/340254
Trust: Robert Griesemer <gri@golang.org>
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2021-08-06 20:34:53 +00:00
Robert Griesemer
313924f272 [dev.typeparams] cmd/compile: swap export order of union term components (cleanup)
Export a term as a pair (tilde, type) rather than (type, tilde)
to match the new Union/Term API.

Change-Id: I221c09c2c746ae19fbae0c970ffb26fa7a8ac736
Reviewed-on: https://go-review.googlesource.com/c/go/+/340251
Trust: Robert Griesemer <gri@golang.org>
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2021-08-06 20:34:52 +00:00
Robert Griesemer
0d7dc417ea [dev.typeparams] cmd/compile: change types2.Union API to accept a list of Terms
Instead of providing a list of tildes and types, use a list of
Terms to create a Union, with suitable accessors.

Define the (exported) notion of a Term representing a union term.

This simplified various uses and also will be easier to extend
should we want to add more information to a Term in the future.

Change-Id: I52fd73938bfa11bac60adbf10580b6d0680df4f1
Reviewed-on: https://go-review.googlesource.com/c/go/+/340250
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2021-08-06 20:34:51 +00:00
Robert Griesemer
09d82689ed [dev.typeparams] cmd/compile/internal/types2: add defined type to term/termlist tests
Follow-up on https://golang.org/cl/339596 .

Change-Id: Ifa249379df083f80176b9f99900be0bf12483f41
Reviewed-on: https://go-review.googlesource.com/c/go/+/339905
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2021-08-06 20:34:50 +00:00
Robert Griesemer
3a9fd99849 [dev.typeparams] cmd/compile/internal/syntax: cleanup panic calls
End-users are not expected to deal with the details of panics,
so providing extra information such as an "internal error" prefix
is not helpful.

Matches the types2 changes made in https://golang.org/cl/339969 .

Change-Id: Icb34a9daab981a84f41f8ae7ae5dc1b85b2d2c81
Reviewed-on: https://go-review.googlesource.com/c/go/+/339904
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2021-08-06 20:34:48 +00:00
Robert Griesemer
c3b57af8bc [dev.typeparams] cmd/compile/internal/types2: minor cleanup of writeTParamList
Change-Id: Iaa58b17ad65e93548bb3da8231e0cb6da0c48105
Reviewed-on: https://go-review.googlesource.com/c/go/+/339903
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2021-08-06 20:34:47 +00:00
Robert Griesemer
0811108670 [dev.typeparams] cmd/compile/internal/types2: fix make with type parameter argument
For make with a type parameter argument, the structural type of
the type parameter's constraint determines what make is making.

Change-Id: I3b48f8ce3236b7624e0638b5f5be208c5915c987
Reviewed-on: https://go-review.googlesource.com/c/go/+/339899
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2021-08-06 20:34:46 +00:00
Robert Griesemer
93285c89d1 [dev.typeparams] cmd/compile/internal/types2: fix range over exprs of type parameter type
For range expressions of type parameter type, the structural type
of the type parameter's constraint determines the range operation.

While at it, rename implicitArrayDeref to arrayPtrDeref.

Change-Id: Ib631a8a14e717498e5264944f659309df1f68cc2
Reviewed-on: https://go-review.googlesource.com/c/go/+/339897
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2021-08-06 20:34:45 +00:00
Robert Griesemer
5aac85ad5e [dev.typeparams] cmd/compile/internal/types2: better names for things (cleanup)
- use the symbol 𝓤 (as in 𝓤niverse) instead of ⊤ to denote the set
  of all types (for better readabilty, ⊤ is hard to distinguish from
  T in some fonts)

- use isAll instead of isTop to test for the set of all types

- use allTermlist instead of topTermlist to denote the termlist
  representing all types

Change-Id: Idcb0b3398782b38653338e65173c0dbb935e430a
Reviewed-on: https://go-review.googlesource.com/c/go/+/339891
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
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Reviewed-by: Robert Findley <rfindley@google.com>
2021-08-06 20:34:43 +00:00
Dan Scales
110343e4a2 [dev.typeparams] cmd/compile: cleanup wrapper code for generics
Simple change - added some comments, but also removed some TODO comments
which are now done or no longer a question. Cleaned up the initial check
for generic methods.

The one remaining TODO that really needs to be done is generating
dictionary wrappers for any methods involving embedded fields. Given we
are not doing this, I think this would only affect if a struct with an
embedded field with methods was converted to an interface containing the
embedded method, and then the method was called via that interface.

Change-Id: I6a8a2885de33ad60b313c1899b659daef7550dfb
Reviewed-on: https://go-review.googlesource.com/c/go/+/340260
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Dan Scales <danscales@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
2021-08-06 19:33:52 +00:00
Dan Scales
5e33d11e10 [dev.typeparams] cmd/compile: do transformCall with non-shape type of call
Do the transformCall using the original types2-derived type of the call
(in particular, the types of the params as non-shapes). Currently, since
we were using the param types of the instantiation, we might add in
interface conversions to an interface with shapes in the one case of a
full-instantiated generic call. So, we do the transformCall() before
installing the shaped-based instantiation. transformCall() works
correctly even in the case of OCALL/FUNCINST.

Fixed two related bugs:
  - Fixed case where we still were not correctly substituting the types
    for a function instantiation.
  - The type substituter needs to copy field flags while substituting in
    tstruct.

Change-Id: I14e960737d6840a75846ede480e6650534ba3af3
Reviewed-on: https://go-review.googlesource.com/c/go/+/340259
Trust: Dan Scales <danscales@google.com>
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Reviewed-by: Keith Randall <khr@golang.org>
2021-08-06 19:13:56 +00:00
Dan Scales
ac78501b9c [dev.typeparams] cmd/compile: make sure closures inside generic funcs are not compiled
Closures inside generic functions were being added to the g.target.Decls
list during noding, just like other closures. We remove generic
functions/methods from g.target.Decls, so they don't get compiled
(they're only available for export and stenciling). Most closures inside
generic functions/methods were similarly being removed from
g.target.Decls, because they have a generic parameter. But we need to
ensure no closures in generic function/methods are left remaining in
g.target.Decls, since we don't want them transformed and compiled.

So, we set a flag in (*irgen) that records when we are noding a
top-level generic function/method, and don't add any closures to
g.target.Decls when the flag is true.

Updates #47514

Change-Id: Id66b4c41d307ffa8f54cab6ce3646ade81606862
Reviewed-on: https://go-review.googlesource.com/c/go/+/340258
Trust: Dan Scales <danscales@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
2021-08-06 18:50:46 +00:00
Jason A. Donenfeld
70546f6404 runtime: allow arm64 SEH to be called if illegal instruction
DLLs built with recent Microsoft toolchains for ARM64 test for ARMv8.1
atomics by potentially calling an illegal instruction, and then trapping
the exception to disable use of them by way of a structured exception
handler. However, vectored exception handlers are always called before
structured exception handlers. When LoadLibrary-ing DLLs that do this
probing during initialization, our lastcontinuehandler winds up being
called, and then crashing, but actually it should give execution back to
the library to handle the exception and fix up the state. So special
case this for arm64 with illegal instructions, and hope that we're not
masking other things in external DLLs that might more fatally trigger an
illegal instruction exception.

Updates #47576.

Change-Id: I341ab99cd8d513ae999b75596749d49779072022
Reviewed-on: https://go-review.googlesource.com/c/go/+/340070
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
2021-08-06 16:51:12 +00:00
Matthew Dempsky
fd45e267c2 runtime: warn that KeepAlive is not an unsafe.Pointer workaround
Even experienced users occasionally mistake that runtime.KeepAlive can
be used as a workaround for following the unsafe.Pointer safety rules,
but it cannot. Add an explicit warning to this effect to dissuade
users from trying to use it as such.

Fixes #47562.

Change-Id: I842e33a3e1c080933c6b1bd1b6318448adbf495c
Reviewed-on: https://go-review.googlesource.com/c/go/+/340269
Trust: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2021-08-05 20:22:31 +00:00
Robert Griesemer
f78d538858 [dev.typeparams] cmd/compile/internal/types2: cleanup panic calls
End-users are not expected to deal with the details of panics,
so providing extra information such as an "internal error" prefix
or the name of the function invoking the panic are not helpful.

Remove unnecessary panic verbiage if it is readily available from
a stack trace (such as the function where it happens, and the fact
that is is an "internal error").

Change-Id: I5f86bae6d2cca7c04ce692d17257da7ddee206d7
Reviewed-on: https://go-review.googlesource.com/c/go/+/339969
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
2021-08-05 19:37:01 +00:00
Robert Griesemer
c5b6c36ddd [dev.typeparams] cmd/compile/internal/types2: remove TestIncompleteInterfaces (cleanup)
TestIncompleteInterfaces is not useful anymore because interface
printing always shows the syntactic type structure of an interface.

Also remove the respective support code in interface printing and
simplify that code.

Move the newDefined and nopos support declarations unchanged into
api_test.go where they are used.

Updates #46167.

Change-Id: I23e303bc4ae4271912ba75f201bd2b7cd4a17b3e
Reviewed-on: https://go-review.googlesource.com/c/go/+/339832
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
2021-08-05 19:36:56 +00:00
Robert Griesemer
f14908d01b [dev.typeparams] cmd/compile/internal/types2: remove unused gcCompatibilityMode flag (cleanup)
This flag is not needed by types2 (and possibly can also be removed
from go/types). Removed some unnecessary comments along the way.

Updates #46174.

Change-Id: I1a7a99f724205a084d1c9850bce6f6f5d33f83ca
Reviewed-on: https://go-review.googlesource.com/c/go/+/339831
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
2021-08-05 19:36:52 +00:00
Robert Griesemer
bb5608dd5d [dev.typeparams] cmd/compile/internal/types2: implement type sets with term lists
This CL resolves several known issues and TODOs.

- Represent type sets with term lists and using term list abstractions.

- Represent Unions internally as a list of (syntactical) terms.
  Use term operations to print terms and detect overlapping union
  entries.

- Compute type sets corresponding to unions lazily, on demand.

- Adjust code throughout.

- Adjusted error check in test/typeparam/mincheck.dir/main.go
  to make test pass.

Change-Id: Ib36fb7e1d343c2b6aec51d304f0f7d1ad415f999
Reviewed-on: https://go-review.googlesource.com/c/go/+/338310
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
2021-08-05 19:36:47 +00:00
Leonard Wang
6dadee759c [dev.typeparams] cmd/compile: unified importReader receiver name to r
Change-Id: Iaf8ec7665282f4f8c0cb09a652e78aa97959274b
Reviewed-on: https://go-review.googlesource.com/c/go/+/340150
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Robert Griesemer <gri@golang.org>
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Griesemer <gri@golang.org>
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2021-08-05 18:01:57 +00:00
Dan Scales
5dcb5e2cea [dev.typeparams] cmd/compile: dictionary/shape cleanup
- Removed gcshapeType - we're going with more granular shapes for now, and gradually
   coarsening later if needed.

 - Put in early return in getDictionarySym(), so the entire rest of the
   function can be un-indented by one level.

 - Removed some duplicated infoprint calls, and fixed one infoprint
   message in getGfInfo.

Change-Id: I13acce8fdabdb21e903275b53ff78a1e6a378de2
Reviewed-on: https://go-review.googlesource.com/c/go/+/339901
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Dan Scales <danscales@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2021-08-05 17:53:59 +00:00
Dan Scales
3cdf8b429e [dev.typeparams] cmd/compile: fixing case where type arg is an interface
In this case, we can't use an itab for doing a bound call, since we're
converting from an interface to an interface. We do a static or dynamic
type assert in new function assertToBound().

The dynamic type assert in assertToBound() is only needed if a bound is
parameterized. In that case, we must do a dynamic type assert, and
therefore need a dictionary entry for the type bound (see change in
getGfInfo). I'm not sure if we can somehow limit this case, since using
an interface as a type arg AND having the type bound of the type
arg be parameterized is a very unlikely case.

Had to add the TUNION case to parameterizedBy1() (which is only used for
extra checking).

Added a bunch of these test cases to 13.go, which now passes.

Change-Id: Ic22eed637fa879b5bbb46d36b40aaad6f90b9d01
Reviewed-on: https://go-review.googlesource.com/c/go/+/339898
Trust: Dan Scales <danscales@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
2021-08-05 17:33:41 +00:00
Rob Findley
1b708c0260 [dev.typeparams] go/types: remove a stale comment (cleanup)
Remove a stale comment from when the new types.Info API was guarded
behind the typeparams build constraint.

Change-Id: I319ad0a9e4e4958efdb96c967bf13a0119b5647b
Reviewed-on: https://go-review.googlesource.com/c/go/+/340010
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2021-08-04 23:24:01 +00:00
Rob Findley
0ec2a8b42d [dev.typeparams] go/types: switch the TArgs API to NumTArgs/TArg
As with other go/types APIs, we should not expose the underlying
Named.targs slice.

Change-Id: Iba869298fbd3856022ffe8ec2c3273341598c324
Reviewed-on: https://go-review.googlesource.com/c/go/+/340009
Trust: Robert Findley <rfindley@google.com>
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Reviewed-by: Robert Griesemer <gri@golang.org>
2021-08-04 23:23:45 +00:00
Robert Griesemer
e5fe769be1 [dev.typeparams] cmd/compile/internal/types2: implement term lists
Prerequisite for clean implementation of type sets
on top of term lists.

Change-Id: Ice87f2f47327aa6b1f3eaad7f9af20ad7c548155
Reviewed-on: https://go-review.googlesource.com/c/go/+/339596
Trust: Robert Griesemer <gri@golang.org>
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Reviewed-by: Robert Findley <rfindley@google.com>
2021-08-04 21:01:48 +00:00