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This CL configures the parser to always accept 1.18 syntax
(type parameters, type instantiations, interface elements),
even when -lang is set to an earlier release.
Instead, the type checker looks for 1.18 operations and
complains if the language version is set to an earlier
release.
Doing these checks during type checking is necessary because it
it is possible to write "generic" code using pre-1.18 syntax;
for instance, an imported generic function may be implicitly
instantiated (as in imported.Max(2, 3)), or an imported constraint
interface may be embedded in an "ordinary" interface.
Fixes #47818.
Change-Id: I83ec302b3f4ba7196c0a4743c03670cfb901310d
Reviewed-on: https://go-review.googlesource.com/c/go/+/344871
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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argument (optimization)
Change-Id: Ie1b4d5b64350ea42484adea14df84cacd1d2653b
Reviewed-on: https://go-review.googlesource.com/c/go/+/344576
Trust: Robert Griesemer <gri@golang.org>
Trust: Dan Scales <danscales@google.com>
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Change Instantiate to be a function (not a method) and return an error.
Introduce an ArgumentError type to report information about which type
argument led to an error during verification.
This resolves a few concerns with the current API:
- The Checker method set was previously just Files. It is somewhat odd
to add an additional method for instantiation. Passing the checker as
an argument seems cleaner.
- pos, posList, and verify were bound together. In cases where no
verification is required, the call site was somewhat cluttered.
- Callers will likely want to access structured information about why
type information is invalid, and also may not have access to position
information. Returning an argument index solves both these problems;
if callers want to associate errors with an argument position, they
can do this via the resulting index.
We may want to make the first argument an opaque environment rather than
a Checker.
Change-Id: I3bc56d205c13d832b538401a4c91d3917c041225
Reviewed-on: https://go-review.googlesource.com/c/go/+/342152
Trust: Robert Findley <rfindley@google.com>
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Instantiate and InstantiateLazy have the same signature; on first
principles, if Instantiate should work for importers it should be
possible to consolidate these APIs.
This CL does this. In order to make it work, a typMap needs to be
threaded through type expansion to prevent infinite recursion in the
case that the Checker is nil.
Notably, Named types now must be expanded before returning from
Underlying(). This makes Underlying generally unsafe to call while type
checking a package, so a helper function safeUnderlying is added to
provide the previous behavior. This is probably overly conservative at
most call sites, but cleanup is deferred to a later CL.
Change-Id: I03cfb75bea0750862cd6eea4e3cdc875a7daa989
Reviewed-on: https://go-review.googlesource.com/c/go/+/341855
Trust: Robert Findley <rfindley@google.com>
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SetConstraint
This matches the accessor named Constraint, and any documentation we have so far.
Use iface instead of Bound internally to types2; keep Bound because of two external
uses but mark it as deprecated. Adjust clients.
Change-Id: Id1a2c2f28259a16082e875eee0534d46cf157336
Reviewed-on: https://go-review.googlesource.com/c/go/+/338196
Trust: Robert Griesemer <gri@golang.org>
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This is a clean port of CL 336251.
Change-Id: I08415c3e9b6cef33594e7d56c4115ddde8030381
Reviewed-on: https://go-review.googlesource.com/c/go/+/338193
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This is a port of CL 336249 with adjustments due to slightly
different handling of type parameter declaration in types2.
The CL also contains adjustments to the compiler front-end.
With this change it is not necessary to export type parameter
indices. Filed issue #47451 so we don't forget.
Change-Id: I2834f7be313fcb4763dff2a9058f1983ee6a81b3
Reviewed-on: https://go-review.googlesource.com/c/go/+/338192
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with Checker.Instantiate
Allow Checker.Instantiate to work with a nil *Checker receiver
(for now). This opens the door to passing in a *Checker at all
times.
Also, added a verify flag to Instantiate, InstantiateLazy, and
instance, to be able to control if constraint satisfaction should
be checked or not.
Removed types2.Instantiate.
For #47103.
Change-Id: Ie00ce41b3e50a0fc4341e013922e5f874276d282
Reviewed-on: https://go-review.googlesource.com/c/go/+/333569
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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We know the exact type, so make it that. This saves some code
and a word of space with each Interface.
Follow-up on a comment in https://golang.org/cl/329309.
Change-Id: I827e39d17aae159a52ac563544c5e6d017bc05ec
Reviewed-on: https://go-review.googlesource.com/c/go/+/332011
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
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arguments (cleanup)
Simplified names and unnecessary function indirections where possible.
Change-Id: I1c7a386393d086fd7ad29f892e03f048781f3547
Reviewed-on: https://go-review.googlesource.com/c/go/+/331512
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for interfaces
With this change, interfaces are "completed" on-demand, when needed,
and the respective information (set of all methods, type constraints)
is recorded in a new typeSet data structure.
As a consequence, interfaces don't need to be explicitly completed
anymore and (internal) uses of interfaces have become much simpler.
This change also introduces a new field Interface.complete to indicate
that all methods and embedded elements have been set up. This prevent
the computation and recording (!) of a partial type set for erroneous
programs (if we compute the partial type set and store it, subsequent
type set accesses use the wrong type set which may lead to follow-on
errors).
Change-Id: I1ffc907f7d0fb93b3e987fe5ff9c6fa5cae00d7f
Reviewed-on: https://go-review.googlesource.com/c/go/+/329309
Trust: Robert Griesemer <gri@golang.org>
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errors involving method expressions
This is an adjusted port of a similar fix in https://golang.org/cl/324733.
Fixes #46583.
Change-Id: Ica1410e4de561e64e58b753e3da04b32156cbaf6
Reviewed-on: https://go-review.googlesource.com/c/go/+/325369
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
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expressions
When synthesizing the Signature to represent a method expression, keep
as much of the original parameter as possible, substituting only the
receiver type.
Fixes #46209.
Change-Id: Ic4531820ae7d203bb0ba25a985f72d219b4aa25f
Reviewed-on: https://go-review.googlesource.com/c/go/+/320489
Trust: Matthew Dempsky <mdempsky@google.com>
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inference
Fixes #44799.
Change-Id: I51d5b6d6fdfcf47b87bf40b1f7e31c3284c2813f
Reviewed-on: https://go-review.googlesource.com/c/go/+/308372
Trust: Robert Griesemer <gri@golang.org>
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Also, factor out recording of type/value information after
evaluating an expression into an operand, so that we can
use it when handling instantiation expressions manually.
Change-Id: I6776e6cc243558079d6a203f2fe0a6ae0ecc33de
Reviewed-on: https://go-review.googlesource.com/c/go/+/308371
Trust: Robert Griesemer <gri@golang.org>
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Constraint type inference is part of the proposed language.
Use an internal flag to control the feayure for debugging.
Change-Id: I7a9eaee92b5ffc23c25d9e68a729acc0d705e879
Reviewed-on: https://go-review.googlesource.com/c/go/+/306770
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
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Rather than splitting up type inference into function argument
and constraint type inference, provide a single Checker.infer
that accepts type parameters, type arguments, value parameters,
and value arguments, if any. Checker.infer returns the completed
list of type arguments, or nil.
Updated (and simplified) call sites.
Change-Id: I9200a44b9c4ab7f2d21eed824abfffaab68ff766
Reviewed-on: https://go-review.googlesource.com/c/go/+/306170
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
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Now that we use square brackets for instantiations, we
can tell type arguments from ordinary arguments without
"guessing" which permits a simpler implementation.
Specifically, replace use of Checker.exprOrTypeList with
Checker.exprList, and delete Checker.exprOrTypeList and
Checker.multiExprOrType.
Disable a test for an (esoteric) failure due to an
unrelated problem with error matching when running
the test.
Change-Id: I17f18fffc32f03fa90d93a68ebf56e5f2fcc9dab
Reviewed-on: https://go-review.googlesource.com/c/go/+/306171
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
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Now that we use square brackets for instantiations, we
can tell type arguments from ordinary arguments without
"guessing" which permits a simpler implementation.
While at it, also fix a minor position error for type
instantiations (now matching the code for function
instantiations).
Change-Id: I20eca51c5b06259703767b5906e89197d6cd595a
Reviewed-on: https://go-review.googlesource.com/c/go/+/306169
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
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Based on https://golang.org/cl/284256 for go/types.
Brings this code more in line with go/types.
Adjusted various tests to match new error messages which
generally are now better: for assignment errors, instead
of a generic "cannot convert" we now say "cannot use"
followed by a clearer reason as to why not.
Major differences to go/types with respect to the changed
files:
- Some of the new code now returns error codes, but they
are only used internally for now, and not reported with
errors.
- go/types does not "convert" untyped nil values to target
types, but here we do. This is unchanged from how types2
handled this before this CL.
Change-Id: If45336d7ee679ece100f6d9d9f291a6ea55004d8
Reviewed-on: https://go-review.googlesource.com/c/go/+/302757
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
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The changes between (equivalent, and reviewed) go/types/call.go
and call.go can be seen by comparing patchset 1 and 2. The actual
changes are removing the "// UNREVIEWED" marker, renaming of
sig_params to sigParams, and a couple of comment adjustments.
These additional changes reduce the difference between this
file and the go/types version.
Note that the verification pass using a MethodSet doesn't
exist because there's no MethodSet in types2.
Change-Id: I4d49460e0457401ed705dff5cfd17c9ff259d89f
Reviewed-on: https://go-review.googlesource.com/c/go/+/300998
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
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- Remove specialized errorf functions for invalid AST/argument/operation.
Instead use prefix constants with the error message.
- Replace several calls to Checker.errorf with calls to Checker.error
if there are no arguments to format.
- Replace a handful of %s format verbs with %v to satisfy vet check.
- Add a basic test that checks that we're not using Checker.errorf when
we should be using Checker.error.
Change-Id: I7bc7c14f3cf774689ec8cd5782ea31b6e30dbcd6
Reviewed-on: https://go-review.googlesource.com/c/go/+/300995
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
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Methods of generic types are instantiated lazily (upon use). Thus,
when we encounter a method of such a type, we need to instantiate
the method signature with the receiver type arguments. We infer
those type arguments from the method receiver. If the method is
embedded, we must use the actual embedded receiver type, otherwise
the receiver type declared with the method doesn't match up and
inference will fail.
(Note that there's no type inference in the source code here, it's
only the implementation which uses the existing inference mechanism
to easily identify the actual type arguments. If the implementation
is correct, the inference will always succeed.)
Updates #44688.
Change-Id: Ie35b62bebaeaf42037f2ca00cf8bd34fec2ddd9c
Reviewed-on: https://go-review.googlesource.com/c/go/+/298129
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
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Change-Id: Iad14571c3e19b01740cd744f0b3025b3e2f1cb72
GitHub-Last-Rev: e8064019299f4e593116060ce2bbd14d62830af7
GitHub-Pull-Request: golang/go#44685
Reviewed-on: https://go-review.googlesource.com/c/go/+/297409
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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go/types more closely
Change-Id: Ib0144e0dd33e9202037e461a85f72f5db08ebd3a
Reviewed-on: https://go-review.googlesource.com/c/go/+/293631
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
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methods with functions
This removes two more converter methods in favor of functions.
This further reduces the API surface of types2.Type and matches
the approach taken in go/types.
Change-Id: I3cdd54c5e0d1e7664a69f3697fc081a66315b969
Reviewed-on: https://go-review.googlesource.com/c/go/+/293292
Trust: Robert Griesemer <gri@golang.org>
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than methods
This change replaces methods with functions to reduce the API surface of
types2.Type and to match the approach taken in go/types. The converter
methods for Named and TypeParam will be addressed in a follow-up CL.
Also: Fixed behavior of optype to return the underlying type for
arguments that are not type parameters.
Change-Id: Ia369c796754bc33bbaf0c9c8478badecb729279b
Reviewed-on: https://go-review.googlesource.com/c/go/+/293291
Trust: Robert Griesemer <gri@golang.org>
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used by types2
We can always re-introduce it if we decide to make use of it.
Change-Id: Ia939fdae978568edc58e21d1af732c6137744aab
Reviewed-on: https://go-review.googlesource.com/c/go/+/285678
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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I missed this in the review of CL 277072, but noticed it in CL 277352.
Change-Id: I432e3569eb4a935cee19805225f02c424d54011e
Reviewed-on: https://go-review.googlesource.com/c/go/+/277962
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This fixes the bug below for types2.
Updates #43124.
Change-Id: Ic1962d41f321d8a08992d8529625bc133e526b0c
Reviewed-on: https://go-review.googlesource.com/c/go/+/278012
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error message for compiler
Also: Triaged/adjusted some more test/fixedbugs tests.
Change-Id: I050847b6dfccc7f301f8100bfdbe84e0487e33fc
Reviewed-on: https://go-review.googlesource.com/c/go/+/276512
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types2 and importer
This is a copy of the importer and types2 (unreviewed) prototype version
excluding the testdata directory containing tests (see below). Each file
is marked with the comment
// UNREVIEWED
on the first line. The plan is to check in this code wholesale (it runs and
passes all tests) and then review the code file-by-file via subsequent CLs
and remove the "// UNREVIEWED" comments as we review the files.
Since most tests are unchanged from the original go/types, the next CL will
commit those tests as they don't need to be reviewed again. (Eventually we
may want to factor them out and share them from a single place, e.g. the
test directory.)
The existing file fmtmap_test.go was updated.
Change-Id: I9bd0ad1a7e7188b501423483a44d18e623c0fe71
Reviewed-on: https://go-review.googlesource.com/c/go/+/263624
Trust: Robert Griesemer <gri@golang.org>
Trust: Keith Randall <khr@golang.org>
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