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Robert Findley 1a2ca95ad2 go/types, types2: only set instance context if packages match 
In CL 404885, we avoid infinite expansion of type instances by sharing a
context between the expanding type and new instances created during
expansion. This ensures that we do not create an infinite number of
identical but distinct instances in the presence of reference cycles.
This pins additional memory to the new instance, but no more
(approximately) than would be pinned by the original expanding instance.

However, we can do better: since type cycles are only possible within a
single package, we only need to share the local context if the two types
are in the same package. This reduces the scope of the shared local
context, and in particular can avoid pinning the package of the
expanding type to the package of the newly created instance.

Updates #52728

Change-Id: Iad2c85f4ecf60125f1da0ba22a7fdec7423e0338
Reviewed-on: https://go-review.googlesource.com/c/go/+/410416
Run-TryBot: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
2022-06-09 01:07:11 +00:00
.github .github: remove duplicate security link 2022-01-07 17:55:09 +00:00
api api/next: minor reformat 2022-06-08 23:36:05 +00:00
doc doc/go1.19: delete remaining TODOs 2022-06-08 15:47:58 +00:00
lib/time lib/time, time/tzdata: update to 2022a 2022-05-31 08:53:53 +00:00
misc misc/cgo/testsanitizers: buffer the signal channel in TestTSAN/tsan11 2022-05-27 15:58:52 +00:00
src go/types, types2: only set instance context if packages match 2022-06-09 01:07:11 +00:00
test cmd/compile: fix wrong unsafe.Offsetof evaluation inside generic function 2022-05-31 14:58:09 +00:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
AUTHORS A+C: add Jinzhu Zhang 2022-05-08 17:28:26 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS A+C: add Jinzhu Zhang 2022-05-08 17:28:26 +00:00
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
PATENTS LICENSE: separate, change PATENTS text 2010-12-06 16:31:59 -05:00
README.md README.md: update wiki link 2022-04-26 16:21:18 +00:00
SECURITY.md SECURITY.md: replace golang.org with go.dev 2022-04-26 19:59:47 +00:00

README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

Gopher image Gopher image by Renee French, licensed under Creative Commons 3.0 Attributions license.

Our canonical Git repository is located at https://go.googlesource.com/go. There is a mirror of the repository at https://github.com/golang/go.

Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.

Download and Install

Binary Distributions

Official binary distributions are available at https://go.dev/dl/.

After downloading a binary release, visit https://go.dev/doc/install for installation instructions.

Install From Source

If a binary distribution is not available for your combination of operating system and architecture, visit https://go.dev/doc/install/source for source installation instructions.

Contributing

Go is the work of thousands of contributors. We appreciate your help!

To contribute, please read the contribution guidelines at https://go.dev/doc/contribute.

Note that the Go project uses the issue tracker for bug reports and proposals only. See https://go.dev/wiki/Questions for a list of places to ask questions about the Go language.