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Alan Donovan 2336c53cf0 cmd/guru: compute referrers as packages are type checked
This CL makes little observable difference to the behavior but paves the
way for streaming 'referrers' and (later) 'implements' queries which
scan the entire workspace, but print each result as soon as it is found.

The go/loader package now exposes a hook, AfterTypeCheck, that lets
clients inspect each package as soon as it is type-checked, and also
modify it, for instance to release unneeded data structures.

A 'referrers' query applied to an exported object must scan the entire
workspace.  It uses this hook so to gather uses of the query object in
streaming fashion.  However, for now, it still accumulates the results
and prints them all at the end, though I propose to change that in a
follow-up.

Code details:
- The referrers logic had a 2-iteration loop to load first the query
  package and then if necessary the enlarged program.  The second
  iteration has now been unrolled and split into globalReferrers.
- Queries for package names (whether in a package declaration or
  a qualified identifier) have been split off into packageReferrers.
  It now loads all direct importers of the query package,
  which catches some references that were missing before.
  (It used to inspect only the forward dependencies of the query
  package.)

Also:
- Referrers.Pos (the position of query identifier) was removed from the
  JSON output.  It's a nuisance to compute now, and it's already
  absent from the plain output.
  (In a follow-up, I plan to simplify the information content of the
  JSON output exactly what is currently printed in the plain output.)

Change-Id: Ia5677636dc7b0fe4461a5d393107665757fb9a97
Reviewed-on: https://go-review.googlesource.com/19794
Reviewed-by: Daniel Morsing <daniel.morsing@gmail.com>
2016-03-04 21:13:08 +00:00
benchmark/parse benchmark/parse: fix cosmetic defect in error str. 2015-02-02 17:07:43 +00:00
blog tools: add import comments. 2014-12-09 22:42:16 +00:00
cmd cmd/guru: compute referrers as packages are type checked 2016-03-04 21:13:08 +00:00
container/intsets container/intsets: use fast popcount with gccgo 2015-11-11 02:17:02 +00:00
cover cover: accept inaccurate block endings 2015-01-07 02:00:16 +00:00
go cmd/guru: compute referrers as packages are type checked 2016-03-04 21:13:08 +00:00
godoc godoc/analysis: use build.Default.GOROOT instead of runtime.GOROOT 2016-03-03 20:16:49 +00:00
imports go/ast/astutil: add function DeleteNamedImport. 2016-02-26 17:37:10 +00:00
oracle oracle: describe: backport fix to 1.4, 1.5 2016-02-04 17:28:22 +00:00
playground playground/socket: fix message buffering 2016-02-29 11:33:26 +00:00
present x/tools/present: add video element for slides 2016-01-13 03:34:37 +00:00
refactor refactor/importgraph: document that graphs are cyclic 2016-03-03 22:47:59 +00:00
.gitattributes tools: copying .gitattributes to all subrepositories (fixes windows build) 2014-12-23 06:32:51 +00:00
.gitignore dashboard: rearrange tree, in prep for packagification 2015-01-15 02:58:11 +00:00
AUTHORS go.empty: prototype for new subrepository 2012-01-25 14:45:13 -05:00
CONTRIBUTING.md doc: add CONTRIBUTING.md 2015-02-18 23:43:38 +00:00
CONTRIBUTORS go.empty: prototype for new subrepository 2012-01-25 14:45:13 -05:00
LICENSE LICENSE: add 2012-03-17 15:20:58 +11:00
PATENTS go.empty: add PATENTS file to the subrepo. 2012-04-16 11:24:04 +10:00
README go.tools/README: minor correction. 2013-10-29 13:20:58 -04:00
codereview.cfg tools: add codereview.cfg 2015-03-18 17:04:00 +00:00

README

This subrepository holds the source for various packages and tools that support
the Go programming language.

Some of the tools, godoc and vet for example, are included in binary Go distributions.
Others, including the Go oracle and the test coverage tool, can be fetched with "go get".

Packages include a type-checker for Go and an implementation of the
Static Single Assignment form (SSA) representation for Go programs.

To submit changes to this repository, see http://golang.org/doc/contribute.html.