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Rob Findley a58d83bcd9 gopls/internal/cache: build the import map lazily during type checking 
For larger repositories, a significant amount of time in the importer is
spent building the import map.

While we don't really want to persist these import maps, which can be
quite large, we can largely eliminate their cost by doing an incremental
breadth-first search of dependencies for the desired import path: most
imports are direct or found within a shallow search starting from the
original package.

As one reference point, the DiagnoseChange/kubernetes benchmark went
from 10% of CPU spent in importMap, to ~0% in importLookup.

Change-Id: I219aa6b7d41dfb11ec5d8a5e3819adc46dd37f2d
Reviewed-on: https://go-review.googlesource.com/c/tools/+/613715
Auto-Submit: Robert Findley <rfindley@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
 		2024-09-17 17:12:07 +00:00
benchmark/parse benchmark/parse: fix format 2024-02-27 16:40:19 +00:00
blog
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cmd cmd/callgraph: make vta use internal version of CHA 2024-09-04 17:50:33 +00:00
container/intsets
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copyright copyright: don't skip directories "." or ".." in checkCopyright 2024-07-08 17:34:28 +00:00
cover
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go go/analysis/passes/printf: add global to disable new diagnostics 2024-09-16 22:55:23 +00:00
godoc x/tools: drop go1.18 support 2024-02-29 16:54:26 +00:00
gopls gopls/internal/cache: build the import map lazily during type checking 2024-09-17 17:12:07 +00:00
imports tools: replace references to obsolete package ioutils 2023-09-12 20:13:37 +00:00
internal go/ssa: extract type recursion into a helper package 2024-09-09 20:13:36 +00:00
playground all: replace all usages of golang.org/x/sys/execabs with os/exec 2023-11-09 20:10:26 +00:00
present x/tools: address review of CL 564515 (CombinedOutput) 2024-02-16 17:20:36 +00:00
refactor x/tools: deprecate astutil.Unparen 2024-09-09 18:20:00 +00:00
txtar txtar: implement fs.FS 2024-07-19 17:32:15 +00:00
.gitattributes
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.prettierrc
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CONTRIBUTING.md
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LICENSE LICENSE: update per Google Legal 2024-07-16 16:13:14 +00:00
PATENTS
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README.md go/vcs: delete 2023-06-26 18:28:02 +00:00
codereview.cfg
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go.mod go.mod: update golang.org/x dependencies 2024-09-05 17:57:31 +00:00
go.sum go.mod: update golang.org/x dependencies 2024-09-05 17:57:31 +00:00

README.md

Go Tools

PkgGoDev

This repository provides the golang.org/x/tools module, comprising various tools and packages mostly for static analysis of Go programs, some of which are listed below. Use the "Go reference" link above for more information about any package.

It also contains the golang.org/x/tools/gopls module, whose root package is a language-server protocol (LSP) server for Go. An LSP server analyses the source code of a project and responds to requests from a wide range of editors such as VSCode and Vim, allowing them to support IDE-like functionality.

Selected commands:

  • cmd/goimports formats a Go program like go fmt and additionally inserts import statements for any packages required by the file after it is edited.
  • cmd/callgraph prints the call graph of a Go program.
  • cmd/digraph is a utility for manipulating directed graphs in textual notation.
  • cmd/stringer generates declarations (including a String method) for "enum" types.
  • cmd/toolstash is a utility to simplify working with multiple versions of the Go toolchain.

These commands may be fetched with a command such as

go install golang.org/x/tools/cmd/goimports@latest

Selected packages:

  • go/ssa provides a static single-assignment form (SSA) intermediate representation (IR) for Go programs, similar to a typical compiler, for use by analysis tools.

  • go/packages provides a simple interface for loading, parsing, and type checking a complete Go program from source code.

  • go/analysis provides a framework for modular static analysis of Go programs.

  • go/callgraph provides call graphs of Go programs using a variety of algorithms with different trade-offs.

  • go/ast/inspector provides an optimized means of traversing a Go parse tree for use in analysis tools.

  • go/cfg provides a simple control-flow graph (CFG) for a Go function.

  • go/expect reads Go source files used as test inputs and interprets special comments within them as queries or assertions for testing.

  • go/gcexportdata and go/gccgoexportdata read and write the binary files containing type information used by the standard and gccgo compilers.

  • go/types/objectpath provides a stable naming scheme for named entities ("objects") in the go/types API.

Numerous other packages provide more esoteric functionality.

Contributing

This repository uses Gerrit for code changes. To learn how to submit changes, see https://golang.org/doc/contribute.html.

The main issue tracker for the tools repository is located at https://github.com/golang/go/issues. Prefix your issue with "x/tools/(your subdir):" in the subject line, so it is easy to find.

JavaScript and CSS Formatting

This repository uses prettier to format JS and CSS files.

The version of prettier used is 1.18.2.

It is encouraged that all JS and CSS code be run through this before submitting a change. However, it is not a strict requirement enforced by CI.