mirror of https://github.com/go-gitea/gitea
Add gitea-vet (#10948)
* Add copyright Signed-off-by: jolheiser <john.olheiser@gmail.com> * Add gitea-vet and fix non-compliance Signed-off-by: jolheiser <john.olheiser@gmail.com> * Combine tools.go into build.go and clean up Signed-off-by: jolheiser <john.olheiser@gmail.com> * Remove extra GO111MODULE=on Signed-off-by: jolheiser <john.olheiser@gmail.com>pull/10952/head^2
John Olheiser
5 years ago
committed by
GitHub
parent
b74d30ae27
commit
baadb51445
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// Copyright 2019 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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// +build tools
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package tools |
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import ( |
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_ "github.com/go-swagger/go-swagger/cmd/swagger" |
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) |
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# GoLand |
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.idea/ |
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# Binaries |
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/gitea-vet* |
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Copyright (c) 2020 The Gitea Authors |
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Permission is hereby granted, free of charge, to any person obtaining a copy |
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of this software and associated documentation files (the "Software"), to deal |
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in the Software without restriction, including without limitation the rights |
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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copies of the Software, and to permit persons to whom the Software is |
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furnished to do so, subject to the following conditions: |
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The above copyright notice and this permission notice shall be included in |
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all copies or substantial portions of the Software. |
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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THE SOFTWARE. |
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.PHONY: build |
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build: |
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go build
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.PHONY: fmt |
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fmt: |
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go fmt ./...
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# gitea-vet |
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`go vet` tool for Gitea |
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| Analyzer | Description | |
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|----------|---------------------------------------------------------------------| |
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| Imports | Checks for import sorting. stdlib->code.gitea.io->other | |
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| License | Checks file headers for some form of `Copyright...YYYY...Gitea/Gogs`| |
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@ -0,0 +1,54 @@ |
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// Copyright 2020 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package checks |
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import ( |
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"strings" |
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"golang.org/x/tools/go/analysis" |
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) |
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var Imports = &analysis.Analyzer{ |
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Name: "imports", |
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Doc: "check for import order.", |
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Run: runImports, |
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} |
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func runImports(pass *analysis.Pass) (interface{}, error) { |
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for _, file := range pass.Files { |
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level := 0 |
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for _, im := range file.Imports { |
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var lvl int |
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val := im.Path.Value |
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if importHasPrefix(val, "code.gitea.io") { |
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lvl = 2 |
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} else if strings.Contains(val, ".") { |
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lvl = 3 |
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} else { |
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lvl = 1 |
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} |
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if lvl < level { |
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pass.Reportf(file.Pos(), "Imports are sorted wrong") |
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break |
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} |
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level = lvl |
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} |
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} |
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return nil, nil |
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} |
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func importHasPrefix(s, p string) bool { |
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return strings.HasPrefix(s, "\""+p) |
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} |
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func sliceHasPrefix(s string, prefixes ...string) bool { |
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for _, p := range prefixes { |
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if importHasPrefix(s, p) { |
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return true |
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} |
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} |
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return false |
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} |
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// Copyright 2020 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package checks |
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import ( |
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"regexp" |
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"strings" |
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"golang.org/x/tools/go/analysis" |
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) |
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var ( |
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header = regexp.MustCompile(`.*Copyright.*\d{4}.*(Gitea|Gogs)`) |
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goGenerate = "//go:generate" |
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buildTag = "// +build" |
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) |
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var License = &analysis.Analyzer{ |
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Name: "license", |
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Doc: "check for a copyright header.", |
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Run: runLicense, |
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} |
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func runLicense(pass *analysis.Pass) (interface{}, error) { |
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for _, file := range pass.Files { |
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if len(file.Comments) == 0 { |
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pass.Reportf(file.Pos(), "Copyright not found") |
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continue |
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} |
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if len(file.Comments[0].List) == 0 { |
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pass.Reportf(file.Pos(), "Copyright not found or wrong") |
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continue |
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} |
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commentGroup := 0 |
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if strings.HasPrefix(file.Comments[0].List[0].Text, goGenerate) { |
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if len(file.Comments[0].List) > 1 { |
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pass.Reportf(file.Pos(), "Must be an empty line between the go:generate and the Copyright") |
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continue |
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} |
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commentGroup++ |
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} |
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if strings.HasPrefix(file.Comments[0].List[0].Text, buildTag) { |
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commentGroup++ |
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} |
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if len(file.Comments) < commentGroup+1 { |
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pass.Reportf(file.Pos(), "Copyright not found") |
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continue |
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} |
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if len(file.Comments[commentGroup].List) < 1 { |
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pass.Reportf(file.Pos(), "Copyright not found or wrong") |
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continue |
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} |
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var check bool |
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for _, comment := range file.Comments[commentGroup].List { |
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if header.MatchString(comment.Text) { |
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check = true |
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} |
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} |
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if !check { |
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pass.Reportf(file.Pos(), "Copyright did not match check") |
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} |
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} |
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return nil, nil |
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} |
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@ -0,0 +1,5 @@ |
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module gitea.com/jolheiser/gitea-vet |
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go 1.14 |
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require golang.org/x/tools v0.0.0-20200325010219-a49f79bcc224 |
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@ -0,0 +1,20 @@ |
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github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74= |
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golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w= |
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golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI= |
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golang.org/x/mod v0.2.0 h1:KU7oHjnv3XNWfa5COkzUifxZmxp1TyI7ImMXqFxLwvQ= |
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golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA= |
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golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= |
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golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= |
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golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= |
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golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= |
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golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= |
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golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= |
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golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= |
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golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= |
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golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo= |
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golang.org/x/tools v0.0.0-20200325010219-a49f79bcc224 h1:azwY/v0y0K4mFHVsg5+UrTgchqALYWpqVo6vL5OmkmI= |
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golang.org/x/tools v0.0.0-20200325010219-a49f79bcc224/go.mod h1:Sl4aGygMT6LrqrWclx+PTx3U+LnKx/seiNR+3G19Ar8= |
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golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= |
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golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= |
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golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4= |
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golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= |
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@ -0,0 +1,17 @@ |
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// Copyright 2020 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package main |
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import ( |
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"gitea.com/jolheiser/gitea-vet/checks" |
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"golang.org/x/tools/go/analysis/unitchecker" |
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) |
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func main() { |
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unitchecker.Main( |
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checks.Imports, |
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checks.License, |
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) |
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} |
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package analysis |
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import ( |
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"flag" |
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"fmt" |
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"go/ast" |
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"go/token" |
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"go/types" |
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"reflect" |
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) |
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// An Analyzer describes an analysis function and its options.
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type Analyzer struct { |
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// The Name of the analyzer must be a valid Go identifier
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// as it may appear in command-line flags, URLs, and so on.
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Name string |
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// Doc is the documentation for the analyzer.
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// The part before the first "\n\n" is the title
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// (no capital or period, max ~60 letters).
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Doc string |
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// Flags defines any flags accepted by the analyzer.
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// The manner in which these flags are exposed to the user
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// depends on the driver which runs the analyzer.
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Flags flag.FlagSet |
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// Run applies the analyzer to a package.
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// It returns an error if the analyzer failed.
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//
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// On success, the Run function may return a result
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// computed by the Analyzer; its type must match ResultType.
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// The driver makes this result available as an input to
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// another Analyzer that depends directly on this one (see
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// Requires) when it analyzes the same package.
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//
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// To pass analysis results between packages (and thus
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// potentially between address spaces), use Facts, which are
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// serializable.
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Run func(*Pass) (interface{}, error) |
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// RunDespiteErrors allows the driver to invoke
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// the Run method of this analyzer even on a
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// package that contains parse or type errors.
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RunDespiteErrors bool |
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// Requires is a set of analyzers that must run successfully
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// before this one on a given package. This analyzer may inspect
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// the outputs produced by each analyzer in Requires.
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// The graph over analyzers implied by Requires edges must be acyclic.
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//
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// Requires establishes a "horizontal" dependency between
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// analysis passes (different analyzers, same package).
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Requires []*Analyzer |
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// ResultType is the type of the optional result of the Run function.
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ResultType reflect.Type |
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// FactTypes indicates that this analyzer imports and exports
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// Facts of the specified concrete types.
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// An analyzer that uses facts may assume that its import
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// dependencies have been similarly analyzed before it runs.
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// Facts must be pointers.
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//
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// FactTypes establishes a "vertical" dependency between
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// analysis passes (same analyzer, different packages).
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FactTypes []Fact |
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} |
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func (a *Analyzer) String() string { return a.Name } |
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// A Pass provides information to the Run function that
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// applies a specific analyzer to a single Go package.
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//
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// It forms the interface between the analysis logic and the driver
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// program, and has both input and an output components.
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//
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// As in a compiler, one pass may depend on the result computed by another.
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//
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// The Run function should not call any of the Pass functions concurrently.
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type Pass struct { |
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Analyzer *Analyzer // the identity of the current analyzer
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// syntax and type information
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Fset *token.FileSet // file position information
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Files []*ast.File // the abstract syntax tree of each file
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OtherFiles []string // names of non-Go files of this package
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Pkg *types.Package // type information about the package
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TypesInfo *types.Info // type information about the syntax trees
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TypesSizes types.Sizes // function for computing sizes of types
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// Report reports a Diagnostic, a finding about a specific location
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// in the analyzed source code such as a potential mistake.
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// It may be called by the Run function.
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Report func(Diagnostic) |
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// ResultOf provides the inputs to this analysis pass, which are
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// the corresponding results of its prerequisite analyzers.
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// The map keys are the elements of Analysis.Required,
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// and the type of each corresponding value is the required
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// analysis's ResultType.
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ResultOf map[*Analyzer]interface{} |
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// -- facts --
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// ImportObjectFact retrieves a fact associated with obj.
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// Given a value ptr of type *T, where *T satisfies Fact,
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// ImportObjectFact copies the value to *ptr.
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//
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// ImportObjectFact panics if called after the pass is complete.
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// ImportObjectFact is not concurrency-safe.
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ImportObjectFact func(obj types.Object, fact Fact) bool |
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// ImportPackageFact retrieves a fact associated with package pkg,
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// which must be this package or one of its dependencies.
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// See comments for ImportObjectFact.
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ImportPackageFact func(pkg *types.Package, fact Fact) bool |
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// ExportObjectFact associates a fact of type *T with the obj,
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// replacing any previous fact of that type.
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//
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// ExportObjectFact panics if it is called after the pass is
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// complete, or if obj does not belong to the package being analyzed.
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// ExportObjectFact is not concurrency-safe.
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ExportObjectFact func(obj types.Object, fact Fact) |
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// ExportPackageFact associates a fact with the current package.
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// See comments for ExportObjectFact.
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ExportPackageFact func(fact Fact) |
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// AllPackageFacts returns a new slice containing all package facts of the analysis's FactTypes
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// in unspecified order.
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// WARNING: This is an experimental API and may change in the future.
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AllPackageFacts func() []PackageFact |
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// AllObjectFacts returns a new slice containing all object facts of the analysis's FactTypes
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// in unspecified order.
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// WARNING: This is an experimental API and may change in the future.
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||||||
|
AllObjectFacts func() []ObjectFact |
||||||
|
|
||||||
|
/* Further fields may be added in future. */ |
||||||
|
// For example, suggested or applied refactorings.
|
||||||
|
} |
||||||
|
|
||||||
|
// PackageFact is a package together with an associated fact.
|
||||||
|
// WARNING: This is an experimental API and may change in the future.
|
||||||
|
type PackageFact struct { |
||||||
|
Package *types.Package |
||||||
|
Fact Fact |
||||||
|
} |
||||||
|
|
||||||
|
// ObjectFact is an object together with an associated fact.
|
||||||
|
// WARNING: This is an experimental API and may change in the future.
|
||||||
|
type ObjectFact struct { |
||||||
|
Object types.Object |
||||||
|
Fact Fact |
||||||
|
} |
||||||
|
|
||||||
|
// Reportf is a helper function that reports a Diagnostic using the
|
||||||
|
// specified position and formatted error message.
|
||||||
|
func (pass *Pass) Reportf(pos token.Pos, format string, args ...interface{}) { |
||||||
|
msg := fmt.Sprintf(format, args...) |
||||||
|
pass.Report(Diagnostic{Pos: pos, Message: msg}) |
||||||
|
} |
||||||
|
|
||||||
|
// The Range interface provides a range. It's equivalent to and satisfied by
|
||||||
|
// ast.Node.
|
||||||
|
type Range interface { |
||||||
|
Pos() token.Pos // position of first character belonging to the node
|
||||||
|
End() token.Pos // position of first character immediately after the node
|
||||||
|
} |
||||||
|
|
||||||
|
// ReportRangef is a helper function that reports a Diagnostic using the
|
||||||
|
// range provided. ast.Node values can be passed in as the range because
|
||||||
|
// they satisfy the Range interface.
|
||||||
|
func (pass *Pass) ReportRangef(rng Range, format string, args ...interface{}) { |
||||||
|
msg := fmt.Sprintf(format, args...) |
||||||
|
pass.Report(Diagnostic{Pos: rng.Pos(), End: rng.End(), Message: msg}) |
||||||
|
} |
||||||
|
|
||||||
|
func (pass *Pass) String() string { |
||||||
|
return fmt.Sprintf("%s@%s", pass.Analyzer.Name, pass.Pkg.Path()) |
||||||
|
} |
||||||
|
|
||||||
|
// A Fact is an intermediate fact produced during analysis.
|
||||||
|
//
|
||||||
|
// Each fact is associated with a named declaration (a types.Object) or
|
||||||
|
// with a package as a whole. A single object or package may have
|
||||||
|
// multiple associated facts, but only one of any particular fact type.
|
||||||
|
//
|
||||||
|
// A Fact represents a predicate such as "never returns", but does not
|
||||||
|
// represent the subject of the predicate such as "function F" or "package P".
|
||||||
|
//
|
||||||
|
// Facts may be produced in one analysis pass and consumed by another
|
||||||
|
// analysis pass even if these are in different address spaces.
|
||||||
|
// If package P imports Q, all facts about Q produced during
|
||||||
|
// analysis of that package will be available during later analysis of P.
|
||||||
|
// Facts are analogous to type export data in a build system:
|
||||||
|
// just as export data enables separate compilation of several passes,
|
||||||
|
// facts enable "separate analysis".
|
||||||
|
//
|
||||||
|
// Each pass (a, p) starts with the set of facts produced by the
|
||||||
|
// same analyzer a applied to the packages directly imported by p.
|
||||||
|
// The analysis may add facts to the set, and they may be exported in turn.
|
||||||
|
// An analysis's Run function may retrieve facts by calling
|
||||||
|
// Pass.Import{Object,Package}Fact and update them using
|
||||||
|
// Pass.Export{Object,Package}Fact.
|
||||||
|
//
|
||||||
|
// A fact is logically private to its Analysis. To pass values
|
||||||
|
// between different analyzers, use the results mechanism;
|
||||||
|
// see Analyzer.Requires, Analyzer.ResultType, and Pass.ResultOf.
|
||||||
|
//
|
||||||
|
// A Fact type must be a pointer.
|
||||||
|
// Facts are encoded and decoded using encoding/gob.
|
||||||
|
// A Fact may implement the GobEncoder/GobDecoder interfaces
|
||||||
|
// to customize its encoding. Fact encoding should not fail.
|
||||||
|
//
|
||||||
|
// A Fact should not be modified once exported.
|
||||||
|
type Fact interface { |
||||||
|
AFact() // dummy method to avoid type errors
|
||||||
|
} |
||||||
@ -0,0 +1,61 @@ |
|||||||
|
package analysis |
||||||
|
|
||||||
|
import "go/token" |
||||||
|
|
||||||
|
// A Diagnostic is a message associated with a source location or range.
|
||||||
|
//
|
||||||
|
// An Analyzer may return a variety of diagnostics; the optional Category,
|
||||||
|
// which should be a constant, may be used to classify them.
|
||||||
|
// It is primarily intended to make it easy to look up documentation.
|
||||||
|
//
|
||||||
|
// If End is provided, the diagnostic is specified to apply to the range between
|
||||||
|
// Pos and End.
|
||||||
|
type Diagnostic struct { |
||||||
|
Pos token.Pos |
||||||
|
End token.Pos // optional
|
||||||
|
Category string // optional
|
||||||
|
Message string |
||||||
|
|
||||||
|
// SuggestedFixes contains suggested fixes for a diagnostic which can be used to perform
|
||||||
|
// edits to a file that address the diagnostic.
|
||||||
|
// TODO(matloob): Should multiple SuggestedFixes be allowed for a diagnostic?
|
||||||
|
// Diagnostics should not contain SuggestedFixes that overlap.
|
||||||
|
// Experimental: This API is experimental and may change in the future.
|
||||||
|
SuggestedFixes []SuggestedFix // optional
|
||||||
|
|
||||||
|
// Experimental: This API is experimental and may change in the future.
|
||||||
|
Related []RelatedInformation // optional
|
||||||
|
} |
||||||
|
|
||||||
|
// RelatedInformation contains information related to a diagnostic.
|
||||||
|
// For example, a diagnostic that flags duplicated declarations of a
|
||||||
|
// variable may include one RelatedInformation per existing
|
||||||
|
// declaration.
|
||||||
|
type RelatedInformation struct { |
||||||
|
Pos token.Pos |
||||||
|
End token.Pos |
||||||
|
Message string |
||||||
|
} |
||||||
|
|
||||||
|
// A SuggestedFix is a code change associated with a Diagnostic that a user can choose
|
||||||
|
// to apply to their code. Usually the SuggestedFix is meant to fix the issue flagged
|
||||||
|
// by the diagnostic.
|
||||||
|
// TextEdits for a SuggestedFix should not overlap. TextEdits for a SuggestedFix
|
||||||
|
// should not contain edits for other packages.
|
||||||
|
// Experimental: This API is experimental and may change in the future.
|
||||||
|
type SuggestedFix struct { |
||||||
|
// A description for this suggested fix to be shown to a user deciding
|
||||||
|
// whether to accept it.
|
||||||
|
Message string |
||||||
|
TextEdits []TextEdit |
||||||
|
} |
||||||
|
|
||||||
|
// A TextEdit represents the replacement of the code between Pos and End with the new text.
|
||||||
|
// Each TextEdit should apply to a single file. End should not be earlier in the file than Pos.
|
||||||
|
// Experimental: This API is experimental and may change in the future.
|
||||||
|
type TextEdit struct { |
||||||
|
// For a pure insertion, End can either be set to Pos or token.NoPos.
|
||||||
|
Pos token.Pos |
||||||
|
End token.Pos |
||||||
|
NewText []byte |
||||||
|
} |
||||||
@ -0,0 +1,301 @@ |
|||||||
|
/* |
||||||
|
|
||||||
|
Package analysis defines the interface between a modular static |
||||||
|
analysis and an analysis driver program. |
||||||
|
|
||||||
|
|
||||||
|
Background |
||||||
|
|
||||||
|
A static analysis is a function that inspects a package of Go code and |
||||||
|
reports a set of diagnostics (typically mistakes in the code), and |
||||||
|
perhaps produces other results as well, such as suggested refactorings |
||||||
|
or other facts. An analysis that reports mistakes is informally called a |
||||||
|
"checker". For example, the printf checker reports mistakes in |
||||||
|
fmt.Printf format strings. |
||||||
|
|
||||||
|
A "modular" analysis is one that inspects one package at a time but can |
||||||
|
save information from a lower-level package and use it when inspecting a |
||||||
|
higher-level package, analogous to separate compilation in a toolchain. |
||||||
|
The printf checker is modular: when it discovers that a function such as |
||||||
|
log.Fatalf delegates to fmt.Printf, it records this fact, and checks |
||||||
|
calls to that function too, including calls made from another package. |
||||||
|
|
||||||
|
By implementing a common interface, checkers from a variety of sources |
||||||
|
can be easily selected, incorporated, and reused in a wide range of |
||||||
|
driver programs including command-line tools (such as vet), text editors and |
||||||
|
IDEs, build and test systems (such as go build, Bazel, or Buck), test |
||||||
|
frameworks, code review tools, code-base indexers (such as SourceGraph), |
||||||
|
documentation viewers (such as godoc), batch pipelines for large code |
||||||
|
bases, and so on. |
||||||
|
|
||||||
|
|
||||||
|
Analyzer |
||||||
|
|
||||||
|
The primary type in the API is Analyzer. An Analyzer statically |
||||||
|
describes an analysis function: its name, documentation, flags, |
||||||
|
relationship to other analyzers, and of course, its logic. |
||||||
|
|
||||||
|
To define an analysis, a user declares a (logically constant) variable |
||||||
|
of type Analyzer. Here is a typical example from one of the analyzers in |
||||||
|
the go/analysis/passes/ subdirectory: |
||||||
|
|
||||||
|
package unusedresult |
||||||
|
|
||||||
|
var Analyzer = &analysis.Analyzer{ |
||||||
|
Name: "unusedresult", |
||||||
|
Doc: "check for unused results of calls to some functions", |
||||||
|
Run: run, |
||||||
|
... |
||||||
|
} |
||||||
|
|
||||||
|
func run(pass *analysis.Pass) (interface{}, error) { |
||||||
|
... |
||||||
|
} |
||||||
|
|
||||||
|
An analysis driver is a program such as vet that runs a set of |
||||||
|
analyses and prints the diagnostics that they report. |
||||||
|
The driver program must import the list of Analyzers it needs. |
||||||
|
Typically each Analyzer resides in a separate package. |
||||||
|
To add a new Analyzer to an existing driver, add another item to the list: |
||||||
|
|
||||||
|
import ( "unusedresult"; "nilness"; "printf" ) |
||||||
|
|
||||||
|
var analyses = []*analysis.Analyzer{ |
||||||
|
unusedresult.Analyzer, |
||||||
|
nilness.Analyzer, |
||||||
|
printf.Analyzer, |
||||||
|
} |
||||||
|
|
||||||
|
A driver may use the name, flags, and documentation to provide on-line |
||||||
|
help that describes the analyses it performs. |
||||||
|
The doc comment contains a brief one-line summary, |
||||||
|
optionally followed by paragraphs of explanation. |
||||||
|
|
||||||
|
The Analyzer type has more fields besides those shown above: |
||||||
|
|
||||||
|
type Analyzer struct { |
||||||
|
Name string |
||||||
|
Doc string |
||||||
|
Flags flag.FlagSet |
||||||
|
Run func(*Pass) (interface{}, error) |
||||||
|
RunDespiteErrors bool |
||||||
|
ResultType reflect.Type |
||||||
|
Requires []*Analyzer |
||||||
|
FactTypes []Fact |
||||||
|
} |
||||||
|
|
||||||
|
The Flags field declares a set of named (global) flag variables that |
||||||
|
control analysis behavior. Unlike vet, analysis flags are not declared |
||||||
|
directly in the command line FlagSet; it is up to the driver to set the |
||||||
|
flag variables. A driver for a single analysis, a, might expose its flag |
||||||
|
f directly on the command line as -f, whereas a driver for multiple |
||||||
|
analyses might prefix the flag name by the analysis name (-a.f) to avoid |
||||||
|
ambiguity. An IDE might expose the flags through a graphical interface, |
||||||
|
and a batch pipeline might configure them from a config file. |
||||||
|
See the "findcall" analyzer for an example of flags in action. |
||||||
|
|
||||||
|
The RunDespiteErrors flag indicates whether the analysis is equipped to |
||||||
|
handle ill-typed code. If not, the driver will skip the analysis if |
||||||
|
there were parse or type errors. |
||||||
|
The optional ResultType field specifies the type of the result value |
||||||
|
computed by this analysis and made available to other analyses. |
||||||
|
The Requires field specifies a list of analyses upon which |
||||||
|
this one depends and whose results it may access, and it constrains the |
||||||
|
order in which a driver may run analyses. |
||||||
|
The FactTypes field is discussed in the section on Modularity. |
||||||
|
The analysis package provides a Validate function to perform basic |
||||||
|
sanity checks on an Analyzer, such as that its Requires graph is |
||||||
|
acyclic, its fact and result types are unique, and so on. |
||||||
|
|
||||||
|
Finally, the Run field contains a function to be called by the driver to |
||||||
|
execute the analysis on a single package. The driver passes it an |
||||||
|
instance of the Pass type. |
||||||
|
|
||||||
|
|
||||||
|
Pass |
||||||
|
|
||||||
|
A Pass describes a single unit of work: the application of a particular |
||||||
|
Analyzer to a particular package of Go code. |
||||||
|
The Pass provides information to the Analyzer's Run function about the |
||||||
|
package being analyzed, and provides operations to the Run function for |
||||||
|
reporting diagnostics and other information back to the driver. |
||||||
|
|
||||||
|
type Pass struct { |
||||||
|
Fset *token.FileSet |
||||||
|
Files []*ast.File |
||||||
|
OtherFiles []string |
||||||
|
Pkg *types.Package |
||||||
|
TypesInfo *types.Info |
||||||
|
ResultOf map[*Analyzer]interface{} |
||||||
|
Report func(Diagnostic) |
||||||
|
... |
||||||
|
} |
||||||
|
|
||||||
|
The Fset, Files, Pkg, and TypesInfo fields provide the syntax trees, |
||||||
|
type information, and source positions for a single package of Go code. |
||||||
|
|
||||||
|
The OtherFiles field provides the names, but not the contents, of non-Go |
||||||
|
files such as assembly that are part of this package. See the "asmdecl" |
||||||
|
or "buildtags" analyzers for examples of loading non-Go files and reporting |
||||||
|
diagnostics against them. |
||||||
|
|
||||||
|
The ResultOf field provides the results computed by the analyzers |
||||||
|
required by this one, as expressed in its Analyzer.Requires field. The |
||||||
|
driver runs the required analyzers first and makes their results |
||||||
|
available in this map. Each Analyzer must return a value of the type |
||||||
|
described in its Analyzer.ResultType field. |
||||||
|
For example, the "ctrlflow" analyzer returns a *ctrlflow.CFGs, which |
||||||
|
provides a control-flow graph for each function in the package (see |
||||||
|
golang.org/x/tools/go/cfg); the "inspect" analyzer returns a value that |
||||||
|
enables other Analyzers to traverse the syntax trees of the package more |
||||||
|
efficiently; and the "buildssa" analyzer constructs an SSA-form |
||||||
|
intermediate representation. |
||||||
|
Each of these Analyzers extends the capabilities of later Analyzers |
||||||
|
without adding a dependency to the core API, so an analysis tool pays |
||||||
|
only for the extensions it needs. |
||||||
|
|
||||||
|
The Report function emits a diagnostic, a message associated with a |
||||||
|
source position. For most analyses, diagnostics are their primary |
||||||
|
result. |
||||||
|
For convenience, Pass provides a helper method, Reportf, to report a new |
||||||
|
diagnostic by formatting a string. |
||||||
|
Diagnostic is defined as: |
||||||
|
|
||||||
|
type Diagnostic struct { |
||||||
|
Pos token.Pos |
||||||
|
Category string // optional
|
||||||
|
Message string |
||||||
|
} |
||||||
|
|
||||||
|
The optional Category field is a short identifier that classifies the |
||||||
|
kind of message when an analysis produces several kinds of diagnostic. |
||||||
|
|
||||||
|
Most Analyzers inspect typed Go syntax trees, but a few, such as asmdecl |
||||||
|
and buildtag, inspect the raw text of Go source files or even non-Go |
||||||
|
files such as assembly. To report a diagnostic against a line of a |
||||||
|
raw text file, use the following sequence: |
||||||
|
|
||||||
|
content, err := ioutil.ReadFile(filename) |
||||||
|
if err != nil { ... } |
||||||
|
tf := fset.AddFile(filename, -1, len(content)) |
||||||
|
tf.SetLinesForContent(content) |
||||||
|
... |
||||||
|
pass.Reportf(tf.LineStart(line), "oops") |
||||||
|
|
||||||
|
|
||||||
|
Modular analysis with Facts |
||||||
|
|
||||||
|
To improve efficiency and scalability, large programs are routinely |
||||||
|
built using separate compilation: units of the program are compiled |
||||||
|
separately, and recompiled only when one of their dependencies changes; |
||||||
|
independent modules may be compiled in parallel. The same technique may |
||||||
|
be applied to static analyses, for the same benefits. Such analyses are |
||||||
|
described as "modular". |
||||||
|
|
||||||
|
A compiler’s type checker is an example of a modular static analysis. |
||||||
|
Many other checkers we would like to apply to Go programs can be |
||||||
|
understood as alternative or non-standard type systems. For example, |
||||||
|
vet's printf checker infers whether a function has the "printf wrapper" |
||||||
|
type, and it applies stricter checks to calls of such functions. In |
||||||
|
addition, it records which functions are printf wrappers for use by |
||||||
|
later analysis passes to identify other printf wrappers by induction. |
||||||
|
A result such as “f is a printf wrapper” that is not interesting by |
||||||
|
itself but serves as a stepping stone to an interesting result (such as |
||||||
|
a diagnostic) is called a "fact". |
||||||
|
|
||||||
|
The analysis API allows an analysis to define new types of facts, to |
||||||
|
associate facts of these types with objects (named entities) declared |
||||||
|
within the current package, or with the package as a whole, and to query |
||||||
|
for an existing fact of a given type associated with an object or |
||||||
|
package. |
||||||
|
|
||||||
|
An Analyzer that uses facts must declare their types: |
||||||
|
|
||||||
|
var Analyzer = &analysis.Analyzer{ |
||||||
|
Name: "printf", |
||||||
|
FactTypes: []analysis.Fact{new(isWrapper)}, |
||||||
|
... |
||||||
|
} |
||||||
|
|
||||||
|
type isWrapper struct{} // => *types.Func f “is a printf wrapper”
|
||||||
|
|
||||||
|
The driver program ensures that facts for a pass’s dependencies are |
||||||
|
generated before analyzing the package and is responsible for propagating |
||||||
|
facts from one package to another, possibly across address spaces. |
||||||
|
Consequently, Facts must be serializable. The API requires that drivers |
||||||
|
use the gob encoding, an efficient, robust, self-describing binary |
||||||
|
protocol. A fact type may implement the GobEncoder/GobDecoder interfaces |
||||||
|
if the default encoding is unsuitable. Facts should be stateless. |
||||||
|
|
||||||
|
The Pass type has functions to import and export facts, |
||||||
|
associated either with an object or with a package: |
||||||
|
|
||||||
|
type Pass struct { |
||||||
|
... |
||||||
|
ExportObjectFact func(types.Object, Fact) |
||||||
|
ImportObjectFact func(types.Object, Fact) bool |
||||||
|
|
||||||
|
ExportPackageFact func(fact Fact) |
||||||
|
ImportPackageFact func(*types.Package, Fact) bool |
||||||
|
} |
||||||
|
|
||||||
|
An Analyzer may only export facts associated with the current package or |
||||||
|
its objects, though it may import facts from any package or object that |
||||||
|
is an import dependency of the current package. |
||||||
|
|
||||||
|
Conceptually, ExportObjectFact(obj, fact) inserts fact into a hidden map keyed by |
||||||
|
the pair (obj, TypeOf(fact)), and the ImportObjectFact function |
||||||
|
retrieves the entry from this map and copies its value into the variable |
||||||
|
pointed to by fact. This scheme assumes that the concrete type of fact |
||||||
|
is a pointer; this assumption is checked by the Validate function. |
||||||
|
See the "printf" analyzer for an example of object facts in action. |
||||||
|
|
||||||
|
Some driver implementations (such as those based on Bazel and Blaze) do |
||||||
|
not currently apply analyzers to packages of the standard library. |
||||||
|
Therefore, for best results, analyzer authors should not rely on |
||||||
|
analysis facts being available for standard packages. |
||||||
|
For example, although the printf checker is capable of deducing during |
||||||
|
analysis of the log package that log.Printf is a printf wrapper, |
||||||
|
this fact is built in to the analyzer so that it correctly checks |
||||||
|
calls to log.Printf even when run in a driver that does not apply |
||||||
|
it to standard packages. We would like to remove this limitation in future. |
||||||
|
|
||||||
|
|
||||||
|
Testing an Analyzer |
||||||
|
|
||||||
|
The analysistest subpackage provides utilities for testing an Analyzer. |
||||||
|
In a few lines of code, it is possible to run an analyzer on a package |
||||||
|
of testdata files and check that it reported all the expected |
||||||
|
diagnostics and facts (and no more). Expectations are expressed using |
||||||
|
"// want ..." comments in the input code. |
||||||
|
|
||||||
|
|
||||||
|
Standalone commands |
||||||
|
|
||||||
|
Analyzers are provided in the form of packages that a driver program is |
||||||
|
expected to import. The vet command imports a set of several analyzers, |
||||||
|
but users may wish to define their own analysis commands that perform |
||||||
|
additional checks. To simplify the task of creating an analysis command, |
||||||
|
either for a single analyzer or for a whole suite, we provide the |
||||||
|
singlechecker and multichecker subpackages. |
||||||
|
|
||||||
|
The singlechecker package provides the main function for a command that |
||||||
|
runs one analyzer. By convention, each analyzer such as |
||||||
|
go/passes/findcall should be accompanied by a singlechecker-based |
||||||
|
command such as go/analysis/passes/findcall/cmd/findcall, defined in its |
||||||
|
entirety as: |
||||||
|
|
||||||
|
package main |
||||||
|
|
||||||
|
import ( |
||||||
|
"golang.org/x/tools/go/analysis/passes/findcall" |
||||||
|
"golang.org/x/tools/go/analysis/singlechecker" |
||||||
|
) |
||||||
|
|
||||||
|
func main() { singlechecker.Main(findcall.Analyzer) } |
||||||
|
|
||||||
|
A tool that provides multiple analyzers can use multichecker in a |
||||||
|
similar way, giving it the list of Analyzers. |
||||||
|
|
||||||
|
*/ |
||||||
|
package analysis |
||||||
@ -0,0 +1,388 @@ |
|||||||
|
// Copyright 2018 The Go Authors. All rights reserved.
|
||||||
|
// Use of this source code is governed by a BSD-style
|
||||||
|
// license that can be found in the LICENSE file.
|
||||||
|
|
||||||
|
// Package analysisflags defines helpers for processing flags of
|
||||||
|
// analysis driver tools.
|
||||||
|
package analysisflags |
||||||
|
|
||||||
|
import ( |
||||||
|
"crypto/sha256" |
||||||
|
"encoding/gob" |
||||||
|
"encoding/json" |
||||||
|
"flag" |
||||||
|
"fmt" |
||||||
|
"go/token" |
||||||
|
"io" |
||||||
|
"io/ioutil" |
||||||
|
"log" |
||||||
|
"os" |
||||||
|
"strconv" |
||||||
|
"strings" |
||||||
|
|
||||||
|
"golang.org/x/tools/go/analysis" |
||||||
|
) |
||||||
|
|
||||||
|
// flags common to all {single,multi,unit}checkers.
|
||||||
|
var ( |
||||||
|
JSON = false // -json
|
||||||
|
Context = -1 // -c=N: if N>0, display offending line plus N lines of context
|
||||||
|
) |
||||||
|
|
||||||
|
// Parse creates a flag for each of the analyzer's flags,
|
||||||
|
// including (in multi mode) a flag named after the analyzer,
|
||||||
|
// parses the flags, then filters and returns the list of
|
||||||
|
// analyzers enabled by flags.
|
||||||
|
//
|
||||||
|
// The result is intended to be passed to unitchecker.Run or checker.Run.
|
||||||
|
// Use in unitchecker.Run will gob.Register all fact types for the returned
|
||||||
|
// graph of analyzers but of course not the ones only reachable from
|
||||||
|
// dropped analyzers. To avoid inconsistency about which gob types are
|
||||||
|
// registered from run to run, Parse itself gob.Registers all the facts
|
||||||
|
// only reachable from dropped analyzers.
|
||||||
|
// This is not a particularly elegant API, but this is an internal package.
|
||||||
|
func Parse(analyzers []*analysis.Analyzer, multi bool) []*analysis.Analyzer { |
||||||
|
// Connect each analysis flag to the command line as -analysis.flag.
|
||||||
|
enabled := make(map[*analysis.Analyzer]*triState) |
||||||
|
for _, a := range analyzers { |
||||||
|
var prefix string |
||||||
|
|
||||||
|
// Add -NAME flag to enable it.
|
||||||
|
if multi { |
||||||
|
prefix = a.Name + "." |
||||||
|
|
||||||
|
enable := new(triState) |
||||||
|
enableUsage := "enable " + a.Name + " analysis" |
||||||
|
flag.Var(enable, a.Name, enableUsage) |
||||||
|
enabled[a] = enable |
||||||
|
} |
||||||
|
|
||||||
|
a.Flags.VisitAll(func(f *flag.Flag) { |
||||||
|
if !multi && flag.Lookup(f.Name) != nil { |
||||||
|
log.Printf("%s flag -%s would conflict with driver; skipping", a.Name, f.Name) |
||||||
|
return |
||||||
|
} |
||||||
|
|
||||||
|
name := prefix + f.Name |
||||||
|
flag.Var(f.Value, name, f.Usage) |
||||||
|
}) |
||||||
|
} |
||||||
|
|
||||||
|
// standard flags: -flags, -V.
|
||||||
|
printflags := flag.Bool("flags", false, "print analyzer flags in JSON") |
||||||
|
addVersionFlag() |
||||||
|
|
||||||
|
// flags common to all checkers
|
||||||
|
flag.BoolVar(&JSON, "json", JSON, "emit JSON output") |
||||||
|
flag.IntVar(&Context, "c", Context, `display offending line with this many lines of context`) |
||||||
|
|
||||||
|
// Add shims for legacy vet flags to enable existing
|
||||||
|
// scripts that run vet to continue to work.
|
||||||
|
_ = flag.Bool("source", false, "no effect (deprecated)") |
||||||
|
_ = flag.Bool("v", false, "no effect (deprecated)") |
||||||
|
_ = flag.Bool("all", false, "no effect (deprecated)") |
||||||
|
_ = flag.String("tags", "", "no effect (deprecated)") |
||||||
|
for old, new := range vetLegacyFlags { |
||||||
|
newFlag := flag.Lookup(new) |
||||||
|
if newFlag != nil && flag.Lookup(old) == nil { |
||||||
|
flag.Var(newFlag.Value, old, "deprecated alias for -"+new) |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
flag.Parse() // (ExitOnError)
|
||||||
|
|
||||||
|
// -flags: print flags so that go vet knows which ones are legitimate.
|
||||||
|
if *printflags { |
||||||
|
printFlags() |
||||||
|
os.Exit(0) |
||||||
|
} |
||||||
|
|
||||||
|
everything := expand(analyzers) |
||||||
|
|
||||||
|
// If any -NAME flag is true, run only those analyzers. Otherwise,
|
||||||
|
// if any -NAME flag is false, run all but those analyzers.
|
||||||
|
if multi { |
||||||
|
var hasTrue, hasFalse bool |
||||||
|
for _, ts := range enabled { |
||||||
|
switch *ts { |
||||||
|
case setTrue: |
||||||
|
hasTrue = true |
||||||
|
case setFalse: |
||||||
|
hasFalse = true |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
var keep []*analysis.Analyzer |
||||||
|
if hasTrue { |
||||||
|
for _, a := range analyzers { |
||||||
|
if *enabled[a] == setTrue { |
||||||
|
keep = append(keep, a) |
||||||
|
} |
||||||
|
} |
||||||
|
analyzers = keep |
||||||
|
} else if hasFalse { |
||||||
|
for _, a := range analyzers { |
||||||
|
if *enabled[a] != setFalse { |
||||||
|
keep = append(keep, a) |
||||||
|
} |
||||||
|
} |
||||||
|
analyzers = keep |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
// Register fact types of skipped analyzers
|
||||||
|
// in case we encounter them in imported files.
|
||||||
|
kept := expand(analyzers) |
||||||
|
for a := range everything { |
||||||
|
if !kept[a] { |
||||||
|
for _, f := range a.FactTypes { |
||||||
|
gob.Register(f) |
||||||
|
} |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
return analyzers |
||||||
|
} |
||||||
|
|
||||||
|
func expand(analyzers []*analysis.Analyzer) map[*analysis.Analyzer]bool { |
||||||
|
seen := make(map[*analysis.Analyzer]bool) |
||||||
|
var visitAll func([]*analysis.Analyzer) |
||||||
|
visitAll = func(analyzers []*analysis.Analyzer) { |
||||||
|
for _, a := range analyzers { |
||||||
|
if !seen[a] { |
||||||
|
seen[a] = true |
||||||
|
visitAll(a.Requires) |
||||||
|
} |
||||||
|
} |
||||||
|
} |
||||||
|
visitAll(analyzers) |
||||||
|
return seen |
||||||
|
} |
||||||
|
|
||||||
|
func printFlags() { |
||||||
|
type jsonFlag struct { |
||||||
|
Name string |
||||||
|
Bool bool |
||||||
|
Usage string |
||||||
|
} |
||||||
|
var flags []jsonFlag = nil |
||||||
|
flag.VisitAll(func(f *flag.Flag) { |
||||||
|
// Don't report {single,multi}checker debugging
|
||||||
|
// flags or fix as these have no effect on unitchecker
|
||||||
|
// (as invoked by 'go vet').
|
||||||
|
switch f.Name { |
||||||
|
case "debug", "cpuprofile", "memprofile", "trace", "fix": |
||||||
|
return |
||||||
|
} |
||||||
|
|
||||||
|
b, ok := f.Value.(interface{ IsBoolFlag() bool }) |
||||||
|
isBool := ok && b.IsBoolFlag() |
||||||
|
flags = append(flags, jsonFlag{f.Name, isBool, f.Usage}) |
||||||
|
}) |
||||||
|
data, err := json.MarshalIndent(flags, "", "\t") |
||||||
|
if err != nil { |
||||||
|
log.Fatal(err) |
||||||
|
} |
||||||
|
os.Stdout.Write(data) |
||||||
|
} |
||||||
|
|
||||||
|
// addVersionFlag registers a -V flag that, if set,
|
||||||
|
// prints the executable version and exits 0.
|
||||||
|
//
|
||||||
|
// If the -V flag already exists — for example, because it was already
|
||||||
|
// registered by a call to cmd/internal/objabi.AddVersionFlag — then
|
||||||
|
// addVersionFlag does nothing.
|
||||||
|
func addVersionFlag() { |
||||||
|
if flag.Lookup("V") == nil { |
||||||
|
flag.Var(versionFlag{}, "V", "print version and exit") |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
// versionFlag minimally complies with the -V protocol required by "go vet".
|
||||||
|
type versionFlag struct{} |
||||||
|
|
||||||
|
func (versionFlag) IsBoolFlag() bool { return true } |
||||||
|
func (versionFlag) Get() interface{} { return nil } |
||||||
|
func (versionFlag) String() string { return "" } |
||||||
|
func (versionFlag) Set(s string) error { |
||||||
|
if s != "full" { |
||||||
|
log.Fatalf("unsupported flag value: -V=%s", s) |
||||||
|
} |
||||||
|
|
||||||
|
// This replicates the minimal subset of
|
||||||
|
// cmd/internal/objabi.AddVersionFlag, which is private to the
|
||||||
|
// go tool yet forms part of our command-line interface.
|
||||||
|
// TODO(adonovan): clarify the contract.
|
||||||
|
|
||||||
|
// Print the tool version so the build system can track changes.
|
||||||
|
// Formats:
|
||||||
|
// $progname version devel ... buildID=...
|
||||||
|
// $progname version go1.9.1
|
||||||
|
progname := os.Args[0] |
||||||
|
f, err := os.Open(progname) |
||||||
|
if err != nil { |
||||||
|
log.Fatal(err) |
||||||
|
} |
||||||
|
h := sha256.New() |
||||||
|
if _, err := io.Copy(h, f); err != nil { |
||||||
|
log.Fatal(err) |
||||||
|
} |
||||||
|
f.Close() |
||||||
|
fmt.Printf("%s version devel comments-go-here buildID=%02x\n", |
||||||
|
progname, string(h.Sum(nil))) |
||||||
|
os.Exit(0) |
||||||
|
return nil |
||||||
|
} |
||||||
|
|
||||||
|
// A triState is a boolean that knows whether
|
||||||
|
// it has been set to either true or false.
|
||||||
|
// It is used to identify whether a flag appears;
|
||||||
|
// the standard boolean flag cannot
|
||||||
|
// distinguish missing from unset.
|
||||||
|
// It also satisfies flag.Value.
|
||||||
|
type triState int |
||||||
|
|
||||||
|
const ( |
||||||
|
unset triState = iota |
||||||
|
setTrue |
||||||
|
setFalse |
||||||
|
) |
||||||
|
|
||||||
|
func triStateFlag(name string, value triState, usage string) *triState { |
||||||
|
flag.Var(&value, name, usage) |
||||||
|
return &value |
||||||
|
} |
||||||
|
|
||||||
|
// triState implements flag.Value, flag.Getter, and flag.boolFlag.
|
||||||
|
// They work like boolean flags: we can say vet -printf as well as vet -printf=true
|
||||||
|
func (ts *triState) Get() interface{} { |
||||||
|
return *ts == setTrue |
||||||
|
} |
||||||
|
|
||||||
|
func (ts triState) isTrue() bool { |
||||||
|
return ts == setTrue |
||||||
|
} |
||||||
|
|
||||||
|
func (ts *triState) Set(value string) error { |
||||||
|
b, err := strconv.ParseBool(value) |
||||||
|
if err != nil { |
||||||
|
// This error message looks poor but package "flag" adds
|
||||||
|
// "invalid boolean value %q for -NAME: %s"
|
||||||
|
return fmt.Errorf("want true or false") |
||||||
|
} |
||||||
|
if b { |
||||||
|
*ts = setTrue |
||||||
|
} else { |
||||||
|
*ts = setFalse |
||||||
|
} |
||||||
|
return nil |
||||||
|
} |
||||||
|
|
||||||
|
func (ts *triState) String() string { |
||||||
|
switch *ts { |
||||||
|
case unset: |
||||||
|
return "true" |
||||||
|
case setTrue: |
||||||
|
return "true" |
||||||
|
case setFalse: |
||||||
|
return "false" |
||||||
|
} |
||||||
|
panic("not reached") |
||||||
|
} |
||||||
|
|
||||||
|
func (ts triState) IsBoolFlag() bool { |
||||||
|
return true |
||||||
|
} |
||||||
|
|
||||||
|
// Legacy flag support
|
||||||
|
|
||||||
|
// vetLegacyFlags maps flags used by legacy vet to their corresponding
|
||||||
|
// new names. The old names will continue to work.
|
||||||
|
var vetLegacyFlags = map[string]string{ |
||||||
|
// Analyzer name changes
|
||||||
|
"bool": "bools", |
||||||
|
"buildtags": "buildtag", |
||||||
|
"methods": "stdmethods", |
||||||
|
"rangeloops": "loopclosure", |
||||||
|
|
||||||
|
// Analyzer flags
|
||||||
|
"compositewhitelist": "composites.whitelist", |
||||||
|
"printfuncs": "printf.funcs", |
||||||
|
"shadowstrict": "shadow.strict", |
||||||
|
"unusedfuncs": "unusedresult.funcs", |
||||||
|
"unusedstringmethods": "unusedresult.stringmethods", |
||||||
|
} |
||||||
|
|
||||||
|
// ---- output helpers common to all drivers ----
|
||||||
|
|
||||||
|
// PrintPlain prints a diagnostic in plain text form,
|
||||||
|
// with context specified by the -c flag.
|
||||||
|
func PrintPlain(fset *token.FileSet, diag analysis.Diagnostic) { |
||||||
|
posn := fset.Position(diag.Pos) |
||||||
|
fmt.Fprintf(os.Stderr, "%s: %s\n", posn, diag.Message) |
||||||
|
|
||||||
|
// -c=N: show offending line plus N lines of context.
|
||||||
|
if Context >= 0 { |
||||||
|
posn := fset.Position(diag.Pos) |
||||||
|
end := fset.Position(diag.End) |
||||||
|
if !end.IsValid() { |
||||||
|
end = posn |
||||||
|
} |
||||||
|
data, _ := ioutil.ReadFile(posn.Filename) |
||||||
|
lines := strings.Split(string(data), "\n") |
||||||
|
for i := posn.Line - Context; i <= end.Line+Context; i++ { |
||||||
|
if 1 <= i && i <= len(lines) { |
||||||
|
fmt.Fprintf(os.Stderr, "%d\t%s\n", i, lines[i-1]) |
||||||
|
} |
||||||
|
} |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
// A JSONTree is a mapping from package ID to analysis name to result.
|
||||||
|
// Each result is either a jsonError or a list of jsonDiagnostic.
|
||||||
|
type JSONTree map[string]map[string]interface{} |
||||||
|
|
||||||
|
// Add adds the result of analysis 'name' on package 'id'.
|
||||||
|
// The result is either a list of diagnostics or an error.
|
||||||
|
func (tree JSONTree) Add(fset *token.FileSet, id, name string, diags []analysis.Diagnostic, err error) { |
||||||
|
var v interface{} |
||||||
|
if err != nil { |
||||||
|
type jsonError struct { |
||||||
|
Err string `json:"error"` |
||||||
|
} |
||||||
|
v = jsonError{err.Error()} |
||||||
|
} else if len(diags) > 0 { |
||||||
|
type jsonDiagnostic struct { |
||||||
|
Category string `json:"category,omitempty"` |
||||||
|
Posn string `json:"posn"` |
||||||
|
Message string `json:"message"` |
||||||
|
} |
||||||
|
var diagnostics []jsonDiagnostic |
||||||
|
// TODO(matloob): Should the JSON diagnostics contain ranges?
|
||||||
|
// If so, how should they be formatted?
|
||||||
|
for _, f := range diags { |
||||||
|
diagnostics = append(diagnostics, jsonDiagnostic{ |
||||||
|
Category: f.Category, |
||||||
|
Posn: fset.Position(f.Pos).String(), |
||||||
|
Message: f.Message, |
||||||
|
}) |
||||||
|
} |
||||||
|
v = diagnostics |
||||||
|
} |
||||||
|
if v != nil { |
||||||
|
m, ok := tree[id] |
||||||
|
if !ok { |
||||||
|
m = make(map[string]interface{}) |
||||||
|
tree[id] = m |
||||||
|
} |
||||||
|
m[name] = v |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
func (tree JSONTree) Print() { |
||||||
|
data, err := json.MarshalIndent(tree, "", "\t") |
||||||
|
if err != nil { |
||||||
|
log.Panicf("internal error: JSON marshalling failed: %v", err) |
||||||
|
} |
||||||
|
fmt.Printf("%s\n", data) |
||||||
|
} |
||||||
@ -0,0 +1,92 @@ |
|||||||
|
package analysisflags |
||||||
|
|
||||||
|
import ( |
||||||
|
"flag" |
||||||
|
"fmt" |
||||||
|
"log" |
||||||
|
"os" |
||||||
|
"sort" |
||||||
|
"strings" |
||||||
|
|
||||||
|
"golang.org/x/tools/go/analysis" |
||||||
|
) |
||||||
|
|
||||||
|
const help = `PROGNAME is a tool for static analysis of Go programs. |
||||||
|
|
||||||
|
PROGNAME examines Go source code and reports suspicious constructs, |
||||||
|
such as Printf calls whose arguments do not align with the format |
||||||
|
string. It uses heuristics that do not guarantee all reports are |
||||||
|
genuine problems, but it can find errors not caught by the compilers. |
||||||
|
` |
||||||
|
|
||||||
|
// Help implements the help subcommand for a multichecker or unitchecker
|
||||||
|
// style command. The optional args specify the analyzers to describe.
|
||||||
|
// Help calls log.Fatal if no such analyzer exists.
|
||||||
|
func Help(progname string, analyzers []*analysis.Analyzer, args []string) { |
||||||
|
// No args: show summary of all analyzers.
|
||||||
|
if len(args) == 0 { |
||||||
|
fmt.Println(strings.Replace(help, "PROGNAME", progname, -1)) |
||||||
|
fmt.Println("Registered analyzers:") |
||||||
|
fmt.Println() |
||||||
|
sort.Slice(analyzers, func(i, j int) bool { |
||||||
|
return analyzers[i].Name < analyzers[j].Name |
||||||
|
}) |
||||||
|
for _, a := range analyzers { |
||||||
|
title := strings.Split(a.Doc, "\n\n")[0] |
||||||
|
fmt.Printf(" %-12s %s\n", a.Name, title) |
||||||
|
} |
||||||
|
fmt.Println("\nBy default all analyzers are run.") |
||||||
|
fmt.Println("To select specific analyzers, use the -NAME flag for each one,") |
||||||
|
fmt.Println(" or -NAME=false to run all analyzers not explicitly disabled.") |
||||||
|
|
||||||
|
// Show only the core command-line flags.
|
||||||
|
fmt.Println("\nCore flags:") |
||||||
|
fmt.Println() |
||||||
|
fs := flag.NewFlagSet("", flag.ExitOnError) |
||||||
|
flag.VisitAll(func(f *flag.Flag) { |
||||||
|
if !strings.Contains(f.Name, ".") { |
||||||
|
fs.Var(f.Value, f.Name, f.Usage) |
||||||
|
} |
||||||
|
}) |
||||||
|
fs.SetOutput(os.Stdout) |
||||||
|
fs.PrintDefaults() |
||||||
|
|
||||||
|
fmt.Printf("\nTo see details and flags of a specific analyzer, run '%s help name'.\n", progname) |
||||||
|
|
||||||
|
return |
||||||
|
} |
||||||
|
|
||||||
|
// Show help on specific analyzer(s).
|
||||||
|
outer: |
||||||
|
for _, arg := range args { |
||||||
|
for _, a := range analyzers { |
||||||
|
if a.Name == arg { |
||||||
|
paras := strings.Split(a.Doc, "\n\n") |
||||||
|
title := paras[0] |
||||||
|
fmt.Printf("%s: %s\n", a.Name, title) |
||||||
|
|
||||||
|
// Show only the flags relating to this analysis,
|
||||||
|
// properly prefixed.
|
||||||
|
first := true |
||||||
|
fs := flag.NewFlagSet(a.Name, flag.ExitOnError) |
||||||
|
a.Flags.VisitAll(func(f *flag.Flag) { |
||||||
|
if first { |
||||||
|
first = false |
||||||
|
fmt.Println("\nAnalyzer flags:") |
||||||
|
fmt.Println() |
||||||
|
} |
||||||
|
fs.Var(f.Value, a.Name+"."+f.Name, f.Usage) |
||||||
|
}) |
||||||
|
fs.SetOutput(os.Stdout) |
||||||
|
fs.PrintDefaults() |
||||||
|
|
||||||
|
if len(paras) > 1 { |
||||||
|
fmt.Printf("\n%s\n", strings.Join(paras[1:], "\n\n")) |
||||||
|
} |
||||||
|
|
||||||
|
continue outer |
||||||
|
} |
||||||
|
} |
||||||
|
log.Fatalf("Analyzer %q not registered", arg) |
||||||
|
} |
||||||
|
} |
||||||
@ -0,0 +1,323 @@ |
|||||||
|
// Copyright 2018 The Go Authors. All rights reserved.
|
||||||
|
// Use of this source code is governed by a BSD-style
|
||||||
|
// license that can be found in the LICENSE file.
|
||||||
|
|
||||||
|
// Package facts defines a serializable set of analysis.Fact.
|
||||||
|
//
|
||||||
|
// It provides a partial implementation of the Fact-related parts of the
|
||||||
|
// analysis.Pass interface for use in analysis drivers such as "go vet"
|
||||||
|
// and other build systems.
|
||||||
|
//
|
||||||
|
// The serial format is unspecified and may change, so the same version
|
||||||
|
// of this package must be used for reading and writing serialized facts.
|
||||||
|
//
|
||||||
|
// The handling of facts in the analysis system parallels the handling
|
||||||
|
// of type information in the compiler: during compilation of package P,
|
||||||
|
// the compiler emits an export data file that describes the type of
|
||||||
|
// every object (named thing) defined in package P, plus every object
|
||||||
|
// indirectly reachable from one of those objects. Thus the downstream
|
||||||
|
// compiler of package Q need only load one export data file per direct
|
||||||
|
// import of Q, and it will learn everything about the API of package P
|
||||||
|
// and everything it needs to know about the API of P's dependencies.
|
||||||
|
//
|
||||||
|
// Similarly, analysis of package P emits a fact set containing facts
|
||||||
|
// about all objects exported from P, plus additional facts about only
|
||||||
|
// those objects of P's dependencies that are reachable from the API of
|
||||||
|
// package P; the downstream analysis of Q need only load one fact set
|
||||||
|
// per direct import of Q.
|
||||||
|
//
|
||||||
|
// The notion of "exportedness" that matters here is that of the
|
||||||
|
// compiler. According to the language spec, a method pkg.T.f is
|
||||||
|
// unexported simply because its name starts with lowercase. But the
|
||||||
|
// compiler must nonetheless export f so that downstream compilations can
|
||||||
|
// accurately ascertain whether pkg.T implements an interface pkg.I
|
||||||
|
// defined as interface{f()}. Exported thus means "described in export
|
||||||
|
// data".
|
||||||
|
//
|
||||||
|
package facts |
||||||
|
|
||||||
|
import ( |
||||||
|
"bytes" |
||||||
|
"encoding/gob" |
||||||
|
"fmt" |
||||||
|
"go/types" |
||||||
|
"io/ioutil" |
||||||
|
"log" |
||||||
|
"reflect" |
||||||
|
"sort" |
||||||
|
"sync" |
||||||
|
|
||||||
|
"golang.org/x/tools/go/analysis" |
||||||
|
"golang.org/x/tools/go/types/objectpath" |
||||||
|
) |
||||||
|
|
||||||
|
const debug = false |
||||||
|
|
||||||
|
// A Set is a set of analysis.Facts.
|
||||||
|
//
|
||||||
|
// Decode creates a Set of facts by reading from the imports of a given
|
||||||
|
// package, and Encode writes out the set. Between these operation,
|
||||||
|
// the Import and Export methods will query and update the set.
|
||||||
|
//
|
||||||
|
// All of Set's methods except String are safe to call concurrently.
|
||||||
|
type Set struct { |
||||||
|
pkg *types.Package |
||||||
|
mu sync.Mutex |
||||||
|
m map[key]analysis.Fact |
||||||
|
} |
||||||
|
|
||||||
|
type key struct { |
||||||
|
pkg *types.Package |
||||||
|
obj types.Object // (object facts only)
|
||||||
|
t reflect.Type |
||||||
|
} |
||||||
|
|
||||||
|
// ImportObjectFact implements analysis.Pass.ImportObjectFact.
|
||||||
|
func (s *Set) ImportObjectFact(obj types.Object, ptr analysis.Fact) bool { |
||||||
|
if obj == nil { |
||||||
|
panic("nil object") |
||||||
|
} |
||||||
|
key := key{pkg: obj.Pkg(), obj: obj, t: reflect.TypeOf(ptr)} |
||||||
|
s.mu.Lock() |
||||||
|
defer s.mu.Unlock() |
||||||
|
if v, ok := s.m[key]; ok { |
||||||
|
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v).Elem()) |
||||||
|
return true |
||||||
|
} |
||||||
|
return false |
||||||
|
} |
||||||
|
|
||||||
|
// ExportObjectFact implements analysis.Pass.ExportObjectFact.
|
||||||
|
func (s *Set) ExportObjectFact(obj types.Object, fact analysis.Fact) { |
||||||
|
if obj.Pkg() != s.pkg { |
||||||
|
log.Panicf("in package %s: ExportObjectFact(%s, %T): can't set fact on object belonging another package", |
||||||
|
s.pkg, obj, fact) |
||||||
|
} |
||||||
|
key := key{pkg: obj.Pkg(), obj: obj, t: reflect.TypeOf(fact)} |
||||||
|
s.mu.Lock() |
||||||
|
s.m[key] = fact // clobber any existing entry
|
||||||
|
s.mu.Unlock() |
||||||
|
} |
||||||
|
|
||||||
|
func (s *Set) AllObjectFacts(filter map[reflect.Type]bool) []analysis.ObjectFact { |
||||||
|
var facts []analysis.ObjectFact |
||||||
|
s.mu.Lock() |
||||||
|
for k, v := range s.m { |
||||||
|
if k.obj != nil && filter[k.t] { |
||||||
|
facts = append(facts, analysis.ObjectFact{Object: k.obj, Fact: v}) |
||||||
|
} |
||||||
|
} |
||||||
|
s.mu.Unlock() |
||||||
|
return facts |
||||||
|
} |
||||||
|
|
||||||
|
// ImportPackageFact implements analysis.Pass.ImportPackageFact.
|
||||||
|
func (s *Set) ImportPackageFact(pkg *types.Package, ptr analysis.Fact) bool { |
||||||
|
if pkg == nil { |
||||||
|
panic("nil package") |
||||||
|
} |
||||||
|
key := key{pkg: pkg, t: reflect.TypeOf(ptr)} |
||||||
|
s.mu.Lock() |
||||||
|
defer s.mu.Unlock() |
||||||
|
if v, ok := s.m[key]; ok { |
||||||
|
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v).Elem()) |
||||||
|
return true |
||||||
|
} |
||||||
|
return false |
||||||
|
} |
||||||
|
|
||||||
|
// ExportPackageFact implements analysis.Pass.ExportPackageFact.
|
||||||
|
func (s *Set) ExportPackageFact(fact analysis.Fact) { |
||||||
|
key := key{pkg: s.pkg, t: reflect.TypeOf(fact)} |
||||||
|
s.mu.Lock() |
||||||
|
s.m[key] = fact // clobber any existing entry
|
||||||
|
s.mu.Unlock() |
||||||
|
} |
||||||
|
|
||||||
|
func (s *Set) AllPackageFacts(filter map[reflect.Type]bool) []analysis.PackageFact { |
||||||
|
var facts []analysis.PackageFact |
||||||
|
s.mu.Lock() |
||||||
|
for k, v := range s.m { |
||||||
|
if k.obj == nil && filter[k.t] { |
||||||
|
facts = append(facts, analysis.PackageFact{Package: k.pkg, Fact: v}) |
||||||
|
} |
||||||
|
} |
||||||
|
s.mu.Unlock() |
||||||
|
return facts |
||||||
|
} |
||||||
|
|
||||||
|
// gobFact is the Gob declaration of a serialized fact.
|
||||||
|
type gobFact struct { |
||||||
|
PkgPath string // path of package
|
||||||
|
Object objectpath.Path // optional path of object relative to package itself
|
||||||
|
Fact analysis.Fact // type and value of user-defined Fact
|
||||||
|
} |
||||||
|
|
||||||
|
// Decode decodes all the facts relevant to the analysis of package pkg.
|
||||||
|
// The read function reads serialized fact data from an external source
|
||||||
|
// for one of of pkg's direct imports. The empty file is a valid
|
||||||
|
// encoding of an empty fact set.
|
||||||
|
//
|
||||||
|
// It is the caller's responsibility to call gob.Register on all
|
||||||
|
// necessary fact types.
|
||||||
|
func Decode(pkg *types.Package, read func(packagePath string) ([]byte, error)) (*Set, error) { |
||||||
|
// Compute the import map for this package.
|
||||||
|
// See the package doc comment.
|
||||||
|
packages := importMap(pkg.Imports()) |
||||||
|
|
||||||
|
// Read facts from imported packages.
|
||||||
|
// Facts may describe indirectly imported packages, or their objects.
|
||||||
|
m := make(map[key]analysis.Fact) // one big bucket
|
||||||
|
for _, imp := range pkg.Imports() { |
||||||
|
logf := func(format string, args ...interface{}) { |
||||||
|
if debug { |
||||||
|
prefix := fmt.Sprintf("in %s, importing %s: ", |
||||||
|
pkg.Path(), imp.Path()) |
||||||
|
log.Print(prefix, fmt.Sprintf(format, args...)) |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
// Read the gob-encoded facts.
|
||||||
|
data, err := read(imp.Path()) |
||||||
|
if err != nil { |
||||||
|
return nil, fmt.Errorf("in %s, can't import facts for package %q: %v", |
||||||
|
pkg.Path(), imp.Path(), err) |
||||||
|
} |
||||||
|
if len(data) == 0 { |
||||||
|
continue // no facts
|
||||||
|
} |
||||||
|
var gobFacts []gobFact |
||||||
|
if err := gob.NewDecoder(bytes.NewReader(data)).Decode(&gobFacts); err != nil { |
||||||
|
return nil, fmt.Errorf("decoding facts for %q: %v", imp.Path(), err) |
||||||
|
} |
||||||
|
if debug { |
||||||
|
logf("decoded %d facts: %v", len(gobFacts), gobFacts) |
||||||
|
} |
||||||
|
|
||||||
|
// Parse each one into a key and a Fact.
|
||||||
|
for _, f := range gobFacts { |
||||||
|
factPkg := packages[f.PkgPath] |
||||||
|
if factPkg == nil { |
||||||
|
// Fact relates to a dependency that was
|
||||||
|
// unused in this translation unit. Skip.
|
||||||
|
logf("no package %q; discarding %v", f.PkgPath, f.Fact) |
||||||
|
continue |
||||||
|
} |
||||||
|
key := key{pkg: factPkg, t: reflect.TypeOf(f.Fact)} |
||||||
|
if f.Object != "" { |
||||||
|
// object fact
|
||||||
|
obj, err := objectpath.Object(factPkg, f.Object) |
||||||
|
if err != nil { |
||||||
|
// (most likely due to unexported object)
|
||||||
|
// TODO(adonovan): audit for other possibilities.
|
||||||
|
logf("no object for path: %v; discarding %s", err, f.Fact) |
||||||
|
continue |
||||||
|
} |
||||||
|
key.obj = obj |
||||||
|
logf("read %T fact %s for %v", f.Fact, f.Fact, key.obj) |
||||||
|
} else { |
||||||
|
// package fact
|
||||||
|
logf("read %T fact %s for %v", f.Fact, f.Fact, factPkg) |
||||||
|
} |
||||||
|
m[key] = f.Fact |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
return &Set{pkg: pkg, m: m}, nil |
||||||
|
} |
||||||
|
|
||||||
|
// Encode encodes a set of facts to a memory buffer.
|
||||||
|
//
|
||||||
|
// It may fail if one of the Facts could not be gob-encoded, but this is
|
||||||
|
// a sign of a bug in an Analyzer.
|
||||||
|
func (s *Set) Encode() []byte { |
||||||
|
|
||||||
|
// TODO(adonovan): opt: use a more efficient encoding
|
||||||
|
// that avoids repeating PkgPath for each fact.
|
||||||
|
|
||||||
|
// Gather all facts, including those from imported packages.
|
||||||
|
var gobFacts []gobFact |
||||||
|
|
||||||
|
s.mu.Lock() |
||||||
|
for k, fact := range s.m { |
||||||
|
if debug { |
||||||
|
log.Printf("%v => %s\n", k, fact) |
||||||
|
} |
||||||
|
var object objectpath.Path |
||||||
|
if k.obj != nil { |
||||||
|
path, err := objectpath.For(k.obj) |
||||||
|
if err != nil { |
||||||
|
if debug { |
||||||
|
log.Printf("discarding fact %s about %s\n", fact, k.obj) |
||||||
|
} |
||||||
|
continue // object not accessible from package API; discard fact
|
||||||
|
} |
||||||
|
object = path |
||||||
|
} |
||||||
|
gobFacts = append(gobFacts, gobFact{ |
||||||
|
PkgPath: k.pkg.Path(), |
||||||
|
Object: object, |
||||||
|
Fact: fact, |
||||||
|
}) |
||||||
|
} |
||||||
|
s.mu.Unlock() |
||||||
|
|
||||||
|
// Sort facts by (package, object, type) for determinism.
|
||||||
|
sort.Slice(gobFacts, func(i, j int) bool { |
||||||
|
x, y := gobFacts[i], gobFacts[j] |
||||||
|
if x.PkgPath != y.PkgPath { |
||||||
|
return x.PkgPath < y.PkgPath |
||||||
|
} |
||||||
|
if x.Object != y.Object { |
||||||
|
return x.Object < y.Object |
||||||
|
} |
||||||
|
tx := reflect.TypeOf(x.Fact) |
||||||
|
ty := reflect.TypeOf(y.Fact) |
||||||
|
if tx != ty { |
||||||
|
return tx.String() < ty.String() |
||||||
|
} |
||||||
|
return false // equal
|
||||||
|
}) |
||||||
|
|
||||||
|
var buf bytes.Buffer |
||||||
|
if len(gobFacts) > 0 { |
||||||
|
if err := gob.NewEncoder(&buf).Encode(gobFacts); err != nil { |
||||||
|
// Fact encoding should never fail. Identify the culprit.
|
||||||
|
for _, gf := range gobFacts { |
||||||
|
if err := gob.NewEncoder(ioutil.Discard).Encode(gf); err != nil { |
||||||
|
fact := gf.Fact |
||||||
|
pkgpath := reflect.TypeOf(fact).Elem().PkgPath() |
||||||
|
log.Panicf("internal error: gob encoding of analysis fact %s failed: %v; please report a bug against fact %T in package %q", |
||||||
|
fact, err, fact, pkgpath) |
||||||
|
} |
||||||
|
} |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
if debug { |
||||||
|
log.Printf("package %q: encode %d facts, %d bytes\n", |
||||||
|
s.pkg.Path(), len(gobFacts), buf.Len()) |
||||||
|
} |
||||||
|
|
||||||
|
return buf.Bytes() |
||||||
|
} |
||||||
|
|
||||||
|
// String is provided only for debugging, and must not be called
|
||||||
|
// concurrent with any Import/Export method.
|
||||||
|
func (s *Set) String() string { |
||||||
|
var buf bytes.Buffer |
||||||
|
buf.WriteString("{") |
||||||
|
for k, f := range s.m { |
||||||
|
if buf.Len() > 1 { |
||||||
|
buf.WriteString(", ") |
||||||
|
} |
||||||
|
if k.obj != nil { |
||||||
|
buf.WriteString(k.obj.String()) |
||||||
|
} else { |
||||||
|
buf.WriteString(k.pkg.Path()) |
||||||
|
} |
||||||
|
fmt.Fprintf(&buf, ": %v", f) |
||||||
|
} |
||||||
|
buf.WriteString("}") |
||||||
|
return buf.String() |
||||||
|
} |
||||||
@ -0,0 +1,88 @@ |
|||||||
|
// Copyright 2018 The Go Authors. All rights reserved.
|
||||||
|
// Use of this source code is governed by a BSD-style
|
||||||
|
// license that can be found in the LICENSE file.
|
||||||
|
|
||||||
|
package facts |
||||||
|
|
||||||
|
import "go/types" |
||||||
|
|
||||||
|
// importMap computes the import map for a package by traversing the
|
||||||
|
// entire exported API each of its imports.
|
||||||
|
//
|
||||||
|
// This is a workaround for the fact that we cannot access the map used
|
||||||
|
// internally by the types.Importer returned by go/importer. The entries
|
||||||
|
// in this map are the packages and objects that may be relevant to the
|
||||||
|
// current analysis unit.
|
||||||
|
//
|
||||||
|
// Packages in the map that are only indirectly imported may be
|
||||||
|
// incomplete (!pkg.Complete()).
|
||||||
|
//
|
||||||
|
func importMap(imports []*types.Package) map[string]*types.Package { |
||||||
|
objects := make(map[types.Object]bool) |
||||||
|
packages := make(map[string]*types.Package) |
||||||
|
|
||||||
|
var addObj func(obj types.Object) bool |
||||||
|
var addType func(T types.Type) |
||||||
|
|
||||||
|
addObj = func(obj types.Object) bool { |
||||||
|
if !objects[obj] { |
||||||
|
objects[obj] = true |
||||||
|
addType(obj.Type()) |
||||||
|
if pkg := obj.Pkg(); pkg != nil { |
||||||
|
packages[pkg.Path()] = pkg |
||||||
|
} |
||||||
|
return true |
||||||
|
} |
||||||
|
return false |
||||||
|
} |
||||||
|
|
||||||
|
addType = func(T types.Type) { |
||||||
|
switch T := T.(type) { |
||||||
|
case *types.Basic: |
||||||
|
// nop
|
||||||
|
case *types.Named: |
||||||
|
if addObj(T.Obj()) { |
||||||
|
for i := 0; i < T.NumMethods(); i++ { |
||||||
|
addObj(T.Method(i)) |
||||||
|
} |
||||||
|
} |
||||||
|
case *types.Pointer: |
||||||
|
addType(T.Elem()) |
||||||
|
case *types.Slice: |
||||||
|
addType(T.Elem()) |
||||||
|
case *types.Array: |
||||||
|
addType(T.Elem()) |
||||||
|
case *types.Chan: |
||||||
|
addType(T.Elem()) |
||||||
|
case *types.Map: |
||||||
|
addType(T.Key()) |
||||||
|
addType(T.Elem()) |
||||||
|
case *types.Signature: |
||||||
|
addType(T.Params()) |
||||||
|
addType(T.Results()) |
||||||
|
case *types.Struct: |
||||||
|
for i := 0; i < T.NumFields(); i++ { |
||||||
|
addObj(T.Field(i)) |
||||||
|
} |
||||||
|
case *types.Tuple: |
||||||
|
for i := 0; i < T.Len(); i++ { |
||||||
|
addObj(T.At(i)) |
||||||
|
} |
||||||
|
case *types.Interface: |
||||||
|
for i := 0; i < T.NumMethods(); i++ { |
||||||
|
addObj(T.Method(i)) |
||||||
|
} |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
for _, imp := range imports { |
||||||
|
packages[imp.Path()] = imp |
||||||
|
|
||||||
|
scope := imp.Scope() |
||||||
|
for _, name := range scope.Names() { |
||||||
|
addObj(scope.Lookup(name)) |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
return packages |
||||||
|
} |
||||||
@ -0,0 +1,396 @@ |
|||||||
|
// Copyright 2018 The Go Authors. All rights reserved.
|
||||||
|
// Use of this source code is governed by a BSD-style
|
||||||
|
// license that can be found in the LICENSE file.
|
||||||
|
|
||||||
|
// The unitchecker package defines the main function for an analysis
|
||||||
|
// driver that analyzes a single compilation unit during a build.
|
||||||
|
// It is invoked by a build system such as "go vet":
|
||||||
|
//
|
||||||
|
// $ go vet -vettool=$(which vet)
|
||||||
|
//
|
||||||
|
// It supports the following command-line protocol:
|
||||||
|
//
|
||||||
|
// -V=full describe executable (to the build tool)
|
||||||
|
// -flags describe flags (to the build tool)
|
||||||
|
// foo.cfg description of compilation unit (from the build tool)
|
||||||
|
//
|
||||||
|
// This package does not depend on go/packages.
|
||||||
|
// If you need a standalone tool, use multichecker,
|
||||||
|
// which supports this mode but can also load packages
|
||||||
|
// from source using go/packages.
|
||||||
|
package unitchecker |
||||||
|
|
||||||
|
// TODO(adonovan):
|
||||||
|
// - with gccgo, go build does not build standard library,
|
||||||
|
// so we will not get to analyze it. Yet we must in order
|
||||||
|
// to create base facts for, say, the fmt package for the
|
||||||
|
// printf checker.
|
||||||
|
|
||||||
|
import ( |
||||||
|
"encoding/gob" |
||||||
|
"encoding/json" |
||||||
|
"flag" |
||||||
|
"fmt" |
||||||
|
"go/ast" |
||||||
|
"go/build" |
||||||
|
"go/importer" |
||||||
|
"go/parser" |
||||||
|
"go/token" |
||||||
|
"go/types" |
||||||
|
"io" |
||||||
|
"io/ioutil" |
||||||
|
"log" |
||||||
|
"os" |
||||||
|
"path/filepath" |
||||||
|
"reflect" |
||||||
|
"sort" |
||||||
|
"strings" |
||||||
|
"sync" |
||||||
|
"time" |
||||||
|
|
||||||
|
"golang.org/x/tools/go/analysis" |
||||||
|
"golang.org/x/tools/go/analysis/internal/analysisflags" |
||||||
|
"golang.org/x/tools/go/analysis/internal/facts" |
||||||
|
) |
||||||
|
|
||||||
|
// A Config describes a compilation unit to be analyzed.
|
||||||
|
// It is provided to the tool in a JSON-encoded file
|
||||||
|
// whose name ends with ".cfg".
|
||||||
|
type Config struct { |
||||||
|
ID string // e.g. "fmt [fmt.test]"
|
||||||
|
Compiler string |
||||||
|
Dir string |
||||||
|
ImportPath string |
||||||
|
GoFiles []string |
||||||
|
NonGoFiles []string |
||||||
|
ImportMap map[string]string |
||||||
|
PackageFile map[string]string |
||||||
|
Standard map[string]bool |
||||||
|
PackageVetx map[string]string |
||||||
|
VetxOnly bool |
||||||
|
VetxOutput string |
||||||
|
SucceedOnTypecheckFailure bool |
||||||
|
} |
||||||
|
|
||||||
|
// Main is the main function of a vet-like analysis tool that must be
|
||||||
|
// invoked by a build system to analyze a single package.
|
||||||
|
//
|
||||||
|
// The protocol required by 'go vet -vettool=...' is that the tool must support:
|
||||||
|
//
|
||||||
|
// -flags describe flags in JSON
|
||||||
|
// -V=full describe executable for build caching
|
||||||
|
// foo.cfg perform separate modular analyze on the single
|
||||||
|
// unit described by a JSON config file foo.cfg.
|
||||||
|
//
|
||||||
|
func Main(analyzers ...*analysis.Analyzer) { |
||||||
|
progname := filepath.Base(os.Args[0]) |
||||||
|
log.SetFlags(0) |
||||||
|
log.SetPrefix(progname + ": ") |
||||||
|
|
||||||
|
if err := analysis.Validate(analyzers); err != nil { |
||||||
|
log.Fatal(err) |
||||||
|
} |
||||||
|
|
||||||
|
flag.Usage = func() { |
||||||
|
fmt.Fprintf(os.Stderr, `%[1]s is a tool for static analysis of Go programs. |
||||||
|
|
||||||
|
Usage of %[1]s: |
||||||
|
%.16[1]s unit.cfg # execute analysis specified by config file |
||||||
|
%.16[1]s help # general help |
||||||
|
%.16[1]s help name # help on specific analyzer and its flags |
||||||
|
`, progname) |
||||||
|
os.Exit(1) |
||||||
|
} |
||||||
|
|
||||||
|
analyzers = analysisflags.Parse(analyzers, true) |
||||||
|
|
||||||
|
args := flag.Args() |
||||||
|
if len(args) == 0 { |
||||||
|
flag.Usage() |
||||||
|
} |
||||||
|
if args[0] == "help" { |
||||||
|
analysisflags.Help(progname, analyzers, args[1:]) |
||||||
|
os.Exit(0) |
||||||
|
} |
||||||
|
if len(args) != 1 || !strings.HasSuffix(args[0], ".cfg") { |
||||||
|
log.Fatalf(`invoking "go tool vet" directly is unsupported; use "go vet"`) |
||||||
|
} |
||||||
|
Run(args[0], analyzers) |
||||||
|
} |
||||||
|
|
||||||
|
// Run reads the *.cfg file, runs the analysis,
|
||||||
|
// and calls os.Exit with an appropriate error code.
|
||||||
|
// It assumes flags have already been set.
|
||||||
|
func Run(configFile string, analyzers []*analysis.Analyzer) { |
||||||
|
cfg, err := readConfig(configFile) |
||||||
|
if err != nil { |
||||||
|
log.Fatal(err) |
||||||
|
} |
||||||
|
|
||||||
|
fset := token.NewFileSet() |
||||||
|
results, err := run(fset, cfg, analyzers) |
||||||
|
if err != nil { |
||||||
|
log.Fatal(err) |
||||||
|
} |
||||||
|
|
||||||
|
// In VetxOnly mode, the analysis is run only for facts.
|
||||||
|
if !cfg.VetxOnly { |
||||||
|
if analysisflags.JSON { |
||||||
|
// JSON output
|
||||||
|
tree := make(analysisflags.JSONTree) |
||||||
|
for _, res := range results { |
||||||
|
tree.Add(fset, cfg.ID, res.a.Name, res.diagnostics, res.err) |
||||||
|
} |
||||||
|
tree.Print() |
||||||
|
} else { |
||||||
|
// plain text
|
||||||
|
exit := 0 |
||||||
|
for _, res := range results { |
||||||
|
if res.err != nil { |
||||||
|
log.Println(res.err) |
||||||
|
exit = 1 |
||||||
|
} |
||||||
|
} |
||||||
|
for _, res := range results { |
||||||
|
for _, diag := range res.diagnostics { |
||||||
|
analysisflags.PrintPlain(fset, diag) |
||||||
|
exit = 1 |
||||||
|
} |
||||||
|
} |
||||||
|
os.Exit(exit) |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
os.Exit(0) |
||||||
|
} |
||||||
|
|
||||||
|
func readConfig(filename string) (*Config, error) { |
||||||
|
data, err := ioutil.ReadFile(filename) |
||||||
|
if err != nil { |
||||||
|
return nil, err |
||||||
|
} |
||||||
|
cfg := new(Config) |
||||||
|
if err := json.Unmarshal(data, cfg); err != nil { |
||||||
|
return nil, fmt.Errorf("cannot decode JSON config file %s: %v", filename, err) |
||||||
|
} |
||||||
|
if len(cfg.GoFiles) == 0 { |
||||||
|
// The go command disallows packages with no files.
|
||||||
|
// The only exception is unsafe, but the go command
|
||||||
|
// doesn't call vet on it.
|
||||||
|
return nil, fmt.Errorf("package has no files: %s", cfg.ImportPath) |
||||||
|
} |
||||||
|
return cfg, nil |
||||||
|
} |
||||||
|
|
||||||
|
var importerForCompiler = func(_ *token.FileSet, compiler string, lookup importer.Lookup) types.Importer { |
||||||
|
// broken legacy implementation (https://golang.org/issue/28995)
|
||||||
|
return importer.For(compiler, lookup) |
||||||
|
} |
||||||
|
|
||||||
|
func run(fset *token.FileSet, cfg *Config, analyzers []*analysis.Analyzer) ([]result, error) { |
||||||
|
// Load, parse, typecheck.
|
||||||
|
var files []*ast.File |
||||||
|
for _, name := range cfg.GoFiles { |
||||||
|
f, err := parser.ParseFile(fset, name, nil, parser.ParseComments) |
||||||
|
if err != nil { |
||||||
|
if cfg.SucceedOnTypecheckFailure { |
||||||
|
// Silently succeed; let the compiler
|
||||||
|
// report parse errors.
|
||||||
|
err = nil |
||||||
|
} |
||||||
|
return nil, err |
||||||
|
} |
||||||
|
files = append(files, f) |
||||||
|
} |
||||||
|
compilerImporter := importerForCompiler(fset, cfg.Compiler, func(path string) (io.ReadCloser, error) { |
||||||
|
// path is a resolved package path, not an import path.
|
||||||
|
file, ok := cfg.PackageFile[path] |
||||||
|
if !ok { |
||||||
|
if cfg.Compiler == "gccgo" && cfg.Standard[path] { |
||||||
|
return nil, nil // fall back to default gccgo lookup
|
||||||
|
} |
||||||
|
return nil, fmt.Errorf("no package file for %q", path) |
||||||
|
} |
||||||
|
return os.Open(file) |
||||||
|
}) |
||||||
|
importer := importerFunc(func(importPath string) (*types.Package, error) { |
||||||
|
path, ok := cfg.ImportMap[importPath] // resolve vendoring, etc
|
||||||
|
if !ok { |
||||||
|
return nil, fmt.Errorf("can't resolve import %q", path) |
||||||
|
} |
||||||
|
return compilerImporter.Import(path) |
||||||
|
}) |
||||||
|
tc := &types.Config{ |
||||||
|
Importer: importer, |
||||||
|
Sizes: types.SizesFor("gc", build.Default.GOARCH), // assume gccgo ≡ gc?
|
||||||
|
} |
||||||
|
info := &types.Info{ |
||||||
|
Types: make(map[ast.Expr]types.TypeAndValue), |
||||||
|
Defs: make(map[*ast.Ident]types.Object), |
||||||
|
Uses: make(map[*ast.Ident]types.Object), |
||||||
|
Implicits: make(map[ast.Node]types.Object), |
||||||
|
Scopes: make(map[ast.Node]*types.Scope), |
||||||
|
Selections: make(map[*ast.SelectorExpr]*types.Selection), |
||||||
|
} |
||||||
|
pkg, err := tc.Check(cfg.ImportPath, fset, files, info) |
||||||
|
if err != nil { |
||||||
|
if cfg.SucceedOnTypecheckFailure { |
||||||
|
// Silently succeed; let the compiler
|
||||||
|
// report type errors.
|
||||||
|
err = nil |
||||||
|
} |
||||||
|
return nil, err |
||||||
|
} |
||||||
|
|
||||||
|
// Register fact types with gob.
|
||||||
|
// In VetxOnly mode, analyzers are only for their facts,
|
||||||
|
// so we can skip any analysis that neither produces facts
|
||||||
|
// nor depends on any analysis that produces facts.
|
||||||
|
// Also build a map to hold working state and result.
|
||||||
|
type action struct { |
||||||
|
once sync.Once |
||||||
|
result interface{} |
||||||
|
err error |
||||||
|
usesFacts bool // (transitively uses)
|
||||||
|
diagnostics []analysis.Diagnostic |
||||||
|
} |
||||||
|
actions := make(map[*analysis.Analyzer]*action) |
||||||
|
var registerFacts func(a *analysis.Analyzer) bool |
||||||
|
registerFacts = func(a *analysis.Analyzer) bool { |
||||||
|
act, ok := actions[a] |
||||||
|
if !ok { |
||||||
|
act = new(action) |
||||||
|
var usesFacts bool |
||||||
|
for _, f := range a.FactTypes { |
||||||
|
usesFacts = true |
||||||
|
gob.Register(f) |
||||||
|
} |
||||||
|
for _, req := range a.Requires { |
||||||
|
if registerFacts(req) { |
||||||
|
usesFacts = true |
||||||
|
} |
||||||
|
} |
||||||
|
act.usesFacts = usesFacts |
||||||
|
actions[a] = act |
||||||
|
} |
||||||
|
return act.usesFacts |
||||||
|
} |
||||||
|
var filtered []*analysis.Analyzer |
||||||
|
for _, a := range analyzers { |
||||||
|
if registerFacts(a) || !cfg.VetxOnly { |
||||||
|
filtered = append(filtered, a) |
||||||
|
} |
||||||
|
} |
||||||
|
analyzers = filtered |
||||||
|
|
||||||
|
// Read facts from imported packages.
|
||||||
|
read := func(path string) ([]byte, error) { |
||||||
|
if vetx, ok := cfg.PackageVetx[path]; ok { |
||||||
|
return ioutil.ReadFile(vetx) |
||||||
|
} |
||||||
|
return nil, nil // no .vetx file, no facts
|
||||||
|
} |
||||||
|
facts, err := facts.Decode(pkg, read) |
||||||
|
if err != nil { |
||||||
|
return nil, err |
||||||
|
} |
||||||
|
|
||||||
|
// In parallel, execute the DAG of analyzers.
|
||||||
|
var exec func(a *analysis.Analyzer) *action |
||||||
|
var execAll func(analyzers []*analysis.Analyzer) |
||||||
|
exec = func(a *analysis.Analyzer) *action { |
||||||
|
act := actions[a] |
||||||
|
act.once.Do(func() { |
||||||
|
execAll(a.Requires) // prefetch dependencies in parallel
|
||||||
|
|
||||||
|
// The inputs to this analysis are the
|
||||||
|
// results of its prerequisites.
|
||||||
|
inputs := make(map[*analysis.Analyzer]interface{}) |
||||||
|
var failed []string |
||||||
|
for _, req := range a.Requires { |
||||||
|
reqact := exec(req) |
||||||
|
if reqact.err != nil { |
||||||
|
failed = append(failed, req.String()) |
||||||
|
continue |
||||||
|
} |
||||||
|
inputs[req] = reqact.result |
||||||
|
} |
||||||
|
|
||||||
|
// Report an error if any dependency failed.
|
||||||
|
if failed != nil { |
||||||
|
sort.Strings(failed) |
||||||
|
act.err = fmt.Errorf("failed prerequisites: %s", strings.Join(failed, ", ")) |
||||||
|
return |
||||||
|
} |
||||||
|
|
||||||
|
factFilter := make(map[reflect.Type]bool) |
||||||
|
for _, f := range a.FactTypes { |
||||||
|
factFilter[reflect.TypeOf(f)] = true |
||||||
|
} |
||||||
|
|
||||||
|
pass := &analysis.Pass{ |
||||||
|
Analyzer: a, |
||||||
|
Fset: fset, |
||||||
|
Files: files, |
||||||
|
OtherFiles: cfg.NonGoFiles, |
||||||
|
Pkg: pkg, |
||||||
|
TypesInfo: info, |
||||||
|
TypesSizes: tc.Sizes, |
||||||
|
ResultOf: inputs, |
||||||
|
Report: func(d analysis.Diagnostic) { act.diagnostics = append(act.diagnostics, d) }, |
||||||
|
ImportObjectFact: facts.ImportObjectFact, |
||||||
|
ExportObjectFact: facts.ExportObjectFact, |
||||||
|
AllObjectFacts: func() []analysis.ObjectFact { return facts.AllObjectFacts(factFilter) }, |
||||||
|
ImportPackageFact: facts.ImportPackageFact, |
||||||
|
ExportPackageFact: facts.ExportPackageFact, |
||||||
|
AllPackageFacts: func() []analysis.PackageFact { return facts.AllPackageFacts(factFilter) }, |
||||||
|
} |
||||||
|
|
||||||
|
t0 := time.Now() |
||||||
|
act.result, act.err = a.Run(pass) |
||||||
|
if false { |
||||||
|
log.Printf("analysis %s = %s", pass, time.Since(t0)) |
||||||
|
} |
||||||
|
}) |
||||||
|
return act |
||||||
|
} |
||||||
|
execAll = func(analyzers []*analysis.Analyzer) { |
||||||
|
var wg sync.WaitGroup |
||||||
|
for _, a := range analyzers { |
||||||
|
wg.Add(1) |
||||||
|
go func(a *analysis.Analyzer) { |
||||||
|
_ = exec(a) |
||||||
|
wg.Done() |
||||||
|
}(a) |
||||||
|
} |
||||||
|
wg.Wait() |
||||||
|
} |
||||||
|
|
||||||
|
execAll(analyzers) |
||||||
|
|
||||||
|
// Return diagnostics and errors from root analyzers.
|
||||||
|
results := make([]result, len(analyzers)) |
||||||
|
for i, a := range analyzers { |
||||||
|
act := actions[a] |
||||||
|
results[i].a = a |
||||||
|
results[i].err = act.err |
||||||
|
results[i].diagnostics = act.diagnostics |
||||||
|
} |
||||||
|
|
||||||
|
data := facts.Encode() |
||||||
|
if err := ioutil.WriteFile(cfg.VetxOutput, data, 0666); err != nil { |
||||||
|
return nil, fmt.Errorf("failed to write analysis facts: %v", err) |
||||||
|
} |
||||||
|
|
||||||
|
return results, nil |
||||||
|
} |
||||||
|
|
||||||
|
type result struct { |
||||||
|
a *analysis.Analyzer |
||||||
|
diagnostics []analysis.Diagnostic |
||||||
|
err error |
||||||
|
} |
||||||
|
|
||||||
|
type importerFunc func(path string) (*types.Package, error) |
||||||
|
|
||||||
|
func (f importerFunc) Import(path string) (*types.Package, error) { return f(path) } |
||||||
@ -0,0 +1,9 @@ |
|||||||
|
// +build go1.12
|
||||||
|
|
||||||
|
package unitchecker |
||||||
|
|
||||||
|
import "go/importer" |
||||||
|
|
||||||
|
func init() { |
||||||
|
importerForCompiler = importer.ForCompiler |
||||||
|
} |
||||||
@ -0,0 +1,97 @@ |
|||||||
|
package analysis |
||||||
|
|
||||||
|
import ( |
||||||
|
"fmt" |
||||||
|
"reflect" |
||||||
|
"unicode" |
||||||
|
) |
||||||
|
|
||||||
|
// Validate reports an error if any of the analyzers are misconfigured.
|
||||||
|
// Checks include:
|
||||||
|
// that the name is a valid identifier;
|
||||||
|
// that the Requires graph is acyclic;
|
||||||
|
// that analyzer fact types are unique;
|
||||||
|
// that each fact type is a pointer.
|
||||||
|
func Validate(analyzers []*Analyzer) error { |
||||||
|
// Map each fact type to its sole generating analyzer.
|
||||||
|
factTypes := make(map[reflect.Type]*Analyzer) |
||||||
|
|
||||||
|
// Traverse the Requires graph, depth first.
|
||||||
|
const ( |
||||||
|
white = iota |
||||||
|
grey |
||||||
|
black |
||||||
|
finished |
||||||
|
) |
||||||
|
color := make(map[*Analyzer]uint8) |
||||||
|
var visit func(a *Analyzer) error |
||||||
|
visit = func(a *Analyzer) error { |
||||||
|
if a == nil { |
||||||
|
return fmt.Errorf("nil *Analyzer") |
||||||
|
} |
||||||
|
if color[a] == white { |
||||||
|
color[a] = grey |
||||||
|
|
||||||
|
// names
|
||||||
|
if !validIdent(a.Name) { |
||||||
|
return fmt.Errorf("invalid analyzer name %q", a) |
||||||
|
} |
||||||
|
|
||||||
|
if a.Doc == "" { |
||||||
|
return fmt.Errorf("analyzer %q is undocumented", a) |
||||||
|
} |
||||||
|
|
||||||
|
// fact types
|
||||||
|
for _, f := range a.FactTypes { |
||||||
|
if f == nil { |
||||||
|
return fmt.Errorf("analyzer %s has nil FactType", a) |
||||||
|
} |
||||||
|
t := reflect.TypeOf(f) |
||||||
|
if prev := factTypes[t]; prev != nil { |
||||||
|
return fmt.Errorf("fact type %s registered by two analyzers: %v, %v", |
||||||
|
t, a, prev) |
||||||
|
} |
||||||
|
if t.Kind() != reflect.Ptr { |
||||||
|
return fmt.Errorf("%s: fact type %s is not a pointer", a, t) |
||||||
|
} |
||||||
|
factTypes[t] = a |
||||||
|
} |
||||||
|
|
||||||
|
// recursion
|
||||||
|
for i, req := range a.Requires { |
||||||
|
if err := visit(req); err != nil { |
||||||
|
return fmt.Errorf("%s.Requires[%d]: %v", a.Name, i, err) |
||||||
|
} |
||||||
|
} |
||||||
|
color[a] = black |
||||||
|
} |
||||||
|
|
||||||
|
return nil |
||||||
|
} |
||||||
|
for _, a := range analyzers { |
||||||
|
if err := visit(a); err != nil { |
||||||
|
return err |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
// Reject duplicates among analyzers.
|
||||||
|
// Precondition: color[a] == black.
|
||||||
|
// Postcondition: color[a] == finished.
|
||||||
|
for _, a := range analyzers { |
||||||
|
if color[a] == finished { |
||||||
|
return fmt.Errorf("duplicate analyzer: %s", a.Name) |
||||||
|
} |
||||||
|
color[a] = finished |
||||||
|
} |
||||||
|
|
||||||
|
return nil |
||||||
|
} |
||||||
|
|
||||||
|
func validIdent(name string) bool { |
||||||
|
for i, r := range name { |
||||||
|
if !(r == '_' || unicode.IsLetter(r) || i > 0 && unicode.IsDigit(r)) { |
||||||
|
return false |
||||||
|
} |
||||||
|
} |
||||||
|
return name != "" |
||||||
|
} |
||||||
@ -0,0 +1,523 @@ |
|||||||
|
// Copyright 2018 The Go Authors. All rights reserved.
|
||||||
|
// Use of this source code is governed by a BSD-style
|
||||||
|
// license that can be found in the LICENSE file.
|
||||||
|
|
||||||
|
// Package objectpath defines a naming scheme for types.Objects
|
||||||
|
// (that is, named entities in Go programs) relative to their enclosing
|
||||||
|
// package.
|
||||||
|
//
|
||||||
|
// Type-checker objects are canonical, so they are usually identified by
|
||||||
|
// their address in memory (a pointer), but a pointer has meaning only
|
||||||
|
// within one address space. By contrast, objectpath names allow the
|
||||||
|
// identity of an object to be sent from one program to another,
|
||||||
|
// establishing a correspondence between types.Object variables that are
|
||||||
|
// distinct but logically equivalent.
|
||||||
|
//
|
||||||
|
// A single object may have multiple paths. In this example,
|
||||||
|
// type A struct{ X int }
|
||||||
|
// type B A
|
||||||
|
// the field X has two paths due to its membership of both A and B.
|
||||||
|
// The For(obj) function always returns one of these paths, arbitrarily
|
||||||
|
// but consistently.
|
||||||
|
package objectpath |
||||||
|
|
||||||
|
import ( |
||||||
|
"fmt" |
||||||
|
"strconv" |
||||||
|
"strings" |
||||||
|
|
||||||
|
"go/types" |
||||||
|
) |
||||||
|
|
||||||
|
// A Path is an opaque name that identifies a types.Object
|
||||||
|
// relative to its package. Conceptually, the name consists of a
|
||||||
|
// sequence of destructuring operations applied to the package scope
|
||||||
|
// to obtain the original object.
|
||||||
|
// The name does not include the package itself.
|
||||||
|
type Path string |
||||||
|
|
||||||
|
// Encoding
|
||||||
|
//
|
||||||
|
// An object path is a textual and (with training) human-readable encoding
|
||||||
|
// of a sequence of destructuring operators, starting from a types.Package.
|
||||||
|
// The sequences represent a path through the package/object/type graph.
|
||||||
|
// We classify these operators by their type:
|
||||||
|
//
|
||||||
|
// PO package->object Package.Scope.Lookup
|
||||||
|
// OT object->type Object.Type
|
||||||
|
// TT type->type Type.{Elem,Key,Params,Results,Underlying} [EKPRU]
|
||||||
|
// TO type->object Type.{At,Field,Method,Obj} [AFMO]
|
||||||
|
//
|
||||||
|
// All valid paths start with a package and end at an object
|
||||||
|
// and thus may be defined by the regular language:
|
||||||
|
//
|
||||||
|
// objectpath = PO (OT TT* TO)*
|
||||||
|
//
|
||||||
|
// The concrete encoding follows directly:
|
||||||
|
// - The only PO operator is Package.Scope.Lookup, which requires an identifier.
|
||||||
|
// - The only OT operator is Object.Type,
|
||||||
|
// which we encode as '.' because dot cannot appear in an identifier.
|
||||||
|
// - The TT operators are encoded as [EKPRU].
|
||||||
|
// - The OT operators are encoded as [AFMO];
|
||||||
|
// three of these (At,Field,Method) require an integer operand,
|
||||||
|
// which is encoded as a string of decimal digits.
|
||||||
|
// These indices are stable across different representations
|
||||||
|
// of the same package, even source and export data.
|
||||||
|
//
|
||||||
|
// In the example below,
|
||||||
|
//
|
||||||
|
// package p
|
||||||
|
//
|
||||||
|
// type T interface {
|
||||||
|
// f() (a string, b struct{ X int })
|
||||||
|
// }
|
||||||
|
//
|
||||||
|
// field X has the path "T.UM0.RA1.F0",
|
||||||
|
// representing the following sequence of operations:
|
||||||
|
//
|
||||||
|
// p.Lookup("T") T
|
||||||
|
// .Type().Underlying().Method(0). f
|
||||||
|
// .Type().Results().At(1) b
|
||||||
|
// .Type().Field(0) X
|
||||||
|
//
|
||||||
|
// The encoding is not maximally compact---every R or P is
|
||||||
|
// followed by an A, for example---but this simplifies the
|
||||||
|
// encoder and decoder.
|
||||||
|
//
|
||||||
|
const ( |
||||||
|
// object->type operators
|
||||||
|
opType = '.' // .Type() (Object)
|
||||||
|
|
||||||
|
// type->type operators
|
||||||
|
opElem = 'E' // .Elem() (Pointer, Slice, Array, Chan, Map)
|
||||||
|
opKey = 'K' // .Key() (Map)
|
||||||
|
opParams = 'P' // .Params() (Signature)
|
||||||
|
opResults = 'R' // .Results() (Signature)
|
||||||
|
opUnderlying = 'U' // .Underlying() (Named)
|
||||||
|
|
||||||
|
// type->object operators
|
||||||
|
opAt = 'A' // .At(i) (Tuple)
|
||||||
|
opField = 'F' // .Field(i) (Struct)
|
||||||
|
opMethod = 'M' // .Method(i) (Named or Interface; not Struct: "promoted" names are ignored)
|
||||||
|
opObj = 'O' // .Obj() (Named)
|
||||||
|
) |
||||||
|
|
||||||
|
// The For function returns the path to an object relative to its package,
|
||||||
|
// or an error if the object is not accessible from the package's Scope.
|
||||||
|
//
|
||||||
|
// The For function guarantees to return a path only for the following objects:
|
||||||
|
// - package-level types
|
||||||
|
// - exported package-level non-types
|
||||||
|
// - methods
|
||||||
|
// - parameter and result variables
|
||||||
|
// - struct fields
|
||||||
|
// These objects are sufficient to define the API of their package.
|
||||||
|
// The objects described by a package's export data are drawn from this set.
|
||||||
|
//
|
||||||
|
// For does not return a path for predeclared names, imported package
|
||||||
|
// names, local names, and unexported package-level names (except
|
||||||
|
// types).
|
||||||
|
//
|
||||||
|
// Example: given this definition,
|
||||||
|
//
|
||||||
|
// package p
|
||||||
|
//
|
||||||
|
// type T interface {
|
||||||
|
// f() (a string, b struct{ X int })
|
||||||
|
// }
|
||||||
|
//
|
||||||
|
// For(X) would return a path that denotes the following sequence of operations:
|
||||||
|
//
|
||||||
|
// p.Scope().Lookup("T") (TypeName T)
|
||||||
|
// .Type().Underlying().Method(0). (method Func f)
|
||||||
|
// .Type().Results().At(1) (field Var b)
|
||||||
|
// .Type().Field(0) (field Var X)
|
||||||
|
//
|
||||||
|
// where p is the package (*types.Package) to which X belongs.
|
||||||
|
func For(obj types.Object) (Path, error) { |
||||||
|
pkg := obj.Pkg() |
||||||
|
|
||||||
|
// This table lists the cases of interest.
|
||||||
|
//
|
||||||
|
// Object Action
|
||||||
|
// ------ ------
|
||||||
|
// nil reject
|
||||||
|
// builtin reject
|
||||||
|
// pkgname reject
|
||||||
|
// label reject
|
||||||
|
// var
|
||||||
|
// package-level accept
|
||||||
|
// func param/result accept
|
||||||
|
// local reject
|
||||||
|
// struct field accept
|
||||||
|
// const
|
||||||
|
// package-level accept
|
||||||
|
// local reject
|
||||||
|
// func
|
||||||
|
// package-level accept
|
||||||
|
// init functions reject
|
||||||
|
// concrete method accept
|
||||||
|
// interface method accept
|
||||||
|
// type
|
||||||
|
// package-level accept
|
||||||
|
// local reject
|
||||||
|
//
|
||||||
|
// The only accessible package-level objects are members of pkg itself.
|
||||||
|
//
|
||||||
|
// The cases are handled in four steps:
|
||||||
|
//
|
||||||
|
// 1. reject nil and builtin
|
||||||
|
// 2. accept package-level objects
|
||||||
|
// 3. reject obviously invalid objects
|
||||||
|
// 4. search the API for the path to the param/result/field/method.
|
||||||
|
|
||||||
|
// 1. reference to nil or builtin?
|
||||||
|
if pkg == nil { |
||||||
|
return "", fmt.Errorf("predeclared %s has no path", obj) |
||||||
|
} |
||||||
|
scope := pkg.Scope() |
||||||
|
|
||||||
|
// 2. package-level object?
|
||||||
|
if scope.Lookup(obj.Name()) == obj { |
||||||
|
// Only exported objects (and non-exported types) have a path.
|
||||||
|
// Non-exported types may be referenced by other objects.
|
||||||
|
if _, ok := obj.(*types.TypeName); !ok && !obj.Exported() { |
||||||
|
return "", fmt.Errorf("no path for non-exported %v", obj) |
||||||
|
} |
||||||
|
return Path(obj.Name()), nil |
||||||
|
} |
||||||
|
|
||||||
|
// 3. Not a package-level object.
|
||||||
|
// Reject obviously non-viable cases.
|
||||||
|
switch obj := obj.(type) { |
||||||
|
case *types.Const, // Only package-level constants have a path.
|
||||||
|
*types.TypeName, // Only package-level types have a path.
|
||||||
|
*types.Label, // Labels are function-local.
|
||||||
|
*types.PkgName: // PkgNames are file-local.
|
||||||
|
return "", fmt.Errorf("no path for %v", obj) |
||||||
|
|
||||||
|
case *types.Var: |
||||||
|
// Could be:
|
||||||
|
// - a field (obj.IsField())
|
||||||
|
// - a func parameter or result
|
||||||
|
// - a local var.
|
||||||
|
// Sadly there is no way to distinguish
|
||||||
|
// a param/result from a local
|
||||||
|
// so we must proceed to the find.
|
||||||
|
|
||||||
|
case *types.Func: |
||||||
|
// A func, if not package-level, must be a method.
|
||||||
|
if recv := obj.Type().(*types.Signature).Recv(); recv == nil { |
||||||
|
return "", fmt.Errorf("func is not a method: %v", obj) |
||||||
|
} |
||||||
|
// TODO(adonovan): opt: if the method is concrete,
|
||||||
|
// do a specialized version of the rest of this function so
|
||||||
|
// that it's O(1) not O(|scope|). Basically 'find' is needed
|
||||||
|
// only for struct fields and interface methods.
|
||||||
|
|
||||||
|
default: |
||||||
|
panic(obj) |
||||||
|
} |
||||||
|
|
||||||
|
// 4. Search the API for the path to the var (field/param/result) or method.
|
||||||
|
|
||||||
|
// First inspect package-level named types.
|
||||||
|
// In the presence of path aliases, these give
|
||||||
|
// the best paths because non-types may
|
||||||
|
// refer to types, but not the reverse.
|
||||||
|
empty := make([]byte, 0, 48) // initial space
|
||||||
|
for _, name := range scope.Names() { |
||||||
|
o := scope.Lookup(name) |
||||||
|
tname, ok := o.(*types.TypeName) |
||||||
|
if !ok { |
||||||
|
continue // handle non-types in second pass
|
||||||
|
} |
||||||
|
|
||||||
|
path := append(empty, name...) |
||||||
|
path = append(path, opType) |
||||||
|
|
||||||
|
T := o.Type() |
||||||
|
|
||||||
|
if tname.IsAlias() { |
||||||
|
// type alias
|
||||||
|
if r := find(obj, T, path); r != nil { |
||||||
|
return Path(r), nil |
||||||
|
} |
||||||
|
} else { |
||||||
|
// defined (named) type
|
||||||
|
if r := find(obj, T.Underlying(), append(path, opUnderlying)); r != nil { |
||||||
|
return Path(r), nil |
||||||
|
} |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
// Then inspect everything else:
|
||||||
|
// non-types, and declared methods of defined types.
|
||||||
|
for _, name := range scope.Names() { |
||||||
|
o := scope.Lookup(name) |
||||||
|
path := append(empty, name...) |
||||||
|
if _, ok := o.(*types.TypeName); !ok { |
||||||
|
if o.Exported() { |
||||||
|
// exported non-type (const, var, func)
|
||||||
|
if r := find(obj, o.Type(), append(path, opType)); r != nil { |
||||||
|
return Path(r), nil |
||||||
|
} |
||||||
|
} |
||||||
|
continue |
||||||
|
} |
||||||
|
|
||||||
|
// Inspect declared methods of defined types.
|
||||||
|
if T, ok := o.Type().(*types.Named); ok { |
||||||
|
path = append(path, opType) |
||||||
|
for i := 0; i < T.NumMethods(); i++ { |
||||||
|
m := T.Method(i) |
||||||
|
path2 := appendOpArg(path, opMethod, i) |
||||||
|
if m == obj { |
||||||
|
return Path(path2), nil // found declared method
|
||||||
|
} |
||||||
|
if r := find(obj, m.Type(), append(path2, opType)); r != nil { |
||||||
|
return Path(r), nil |
||||||
|
} |
||||||
|
} |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
return "", fmt.Errorf("can't find path for %v in %s", obj, pkg.Path()) |
||||||
|
} |
||||||
|
|
||||||
|
func appendOpArg(path []byte, op byte, arg int) []byte { |
||||||
|
path = append(path, op) |
||||||
|
path = strconv.AppendInt(path, int64(arg), 10) |
||||||
|
return path |
||||||
|
} |
||||||
|
|
||||||
|
// find finds obj within type T, returning the path to it, or nil if not found.
|
||||||
|
func find(obj types.Object, T types.Type, path []byte) []byte { |
||||||
|
switch T := T.(type) { |
||||||
|
case *types.Basic, *types.Named: |
||||||
|
// Named types belonging to pkg were handled already,
|
||||||
|
// so T must belong to another package. No path.
|
||||||
|
return nil |
||||||
|
case *types.Pointer: |
||||||
|
return find(obj, T.Elem(), append(path, opElem)) |
||||||
|
case *types.Slice: |
||||||
|
return find(obj, T.Elem(), append(path, opElem)) |
||||||
|
case *types.Array: |
||||||
|
return find(obj, T.Elem(), append(path, opElem)) |
||||||
|
case *types.Chan: |
||||||
|
return find(obj, T.Elem(), append(path, opElem)) |
||||||
|
case *types.Map: |
||||||
|
if r := find(obj, T.Key(), append(path, opKey)); r != nil { |
||||||
|
return r |
||||||
|
} |
||||||
|
return find(obj, T.Elem(), append(path, opElem)) |
||||||
|
case *types.Signature: |
||||||
|
if r := find(obj, T.Params(), append(path, opParams)); r != nil { |
||||||
|
return r |
||||||
|
} |
||||||
|
return find(obj, T.Results(), append(path, opResults)) |
||||||
|
case *types.Struct: |
||||||
|
for i := 0; i < T.NumFields(); i++ { |
||||||
|
f := T.Field(i) |
||||||
|
path2 := appendOpArg(path, opField, i) |
||||||
|
if f == obj { |
||||||
|
return path2 // found field var
|
||||||
|
} |
||||||
|
if r := find(obj, f.Type(), append(path2, opType)); r != nil { |
||||||
|
return r |
||||||
|
} |
||||||
|
} |
||||||
|
return nil |
||||||
|
case *types.Tuple: |
||||||
|
for i := 0; i < T.Len(); i++ { |
||||||
|
v := T.At(i) |
||||||
|
path2 := appendOpArg(path, opAt, i) |
||||||
|
if v == obj { |
||||||
|
return path2 // found param/result var
|
||||||
|
} |
||||||
|
if r := find(obj, v.Type(), append(path2, opType)); r != nil { |
||||||
|
return r |
||||||
|
} |
||||||
|
} |
||||||
|
return nil |
||||||
|
case *types.Interface: |
||||||
|
for i := 0; i < T.NumMethods(); i++ { |
||||||
|
m := T.Method(i) |
||||||
|
path2 := appendOpArg(path, opMethod, i) |
||||||
|
if m == obj { |
||||||
|
return path2 // found interface method
|
||||||
|
} |
||||||
|
if r := find(obj, m.Type(), append(path2, opType)); r != nil { |
||||||
|
return r |
||||||
|
} |
||||||
|
} |
||||||
|
return nil |
||||||
|
} |
||||||
|
panic(T) |
||||||
|
} |
||||||
|
|
||||||
|
// Object returns the object denoted by path p within the package pkg.
|
||||||
|
func Object(pkg *types.Package, p Path) (types.Object, error) { |
||||||
|
if p == "" { |
||||||
|
return nil, fmt.Errorf("empty path") |
||||||
|
} |
||||||
|
|
||||||
|
pathstr := string(p) |
||||||
|
var pkgobj, suffix string |
||||||
|
if dot := strings.IndexByte(pathstr, opType); dot < 0 { |
||||||
|
pkgobj = pathstr |
||||||
|
} else { |
||||||
|
pkgobj = pathstr[:dot] |
||||||
|
suffix = pathstr[dot:] // suffix starts with "."
|
||||||
|
} |
||||||
|
|
||||||
|
obj := pkg.Scope().Lookup(pkgobj) |
||||||
|
if obj == nil { |
||||||
|
return nil, fmt.Errorf("package %s does not contain %q", pkg.Path(), pkgobj) |
||||||
|
} |
||||||
|
|
||||||
|
// abstraction of *types.{Pointer,Slice,Array,Chan,Map}
|
||||||
|
type hasElem interface { |
||||||
|
Elem() types.Type |
||||||
|
} |
||||||
|
// abstraction of *types.{Interface,Named}
|
||||||
|
type hasMethods interface { |
||||||
|
Method(int) *types.Func |
||||||
|
NumMethods() int |
||||||
|
} |
||||||
|
|
||||||
|
// The loop state is the pair (t, obj),
|
||||||
|
// exactly one of which is non-nil, initially obj.
|
||||||
|
// All suffixes start with '.' (the only object->type operation),
|
||||||
|
// followed by optional type->type operations,
|
||||||
|
// then a type->object operation.
|
||||||
|
// The cycle then repeats.
|
||||||
|
var t types.Type |
||||||
|
for suffix != "" { |
||||||
|
code := suffix[0] |
||||||
|
suffix = suffix[1:] |
||||||
|
|
||||||
|
// Codes [AFM] have an integer operand.
|
||||||
|
var index int |
||||||
|
switch code { |
||||||
|
case opAt, opField, opMethod: |
||||||
|
rest := strings.TrimLeft(suffix, "0123456789") |
||||||
|
numerals := suffix[:len(suffix)-len(rest)] |
||||||
|
suffix = rest |
||||||
|
i, err := strconv.Atoi(numerals) |
||||||
|
if err != nil { |
||||||
|
return nil, fmt.Errorf("invalid path: bad numeric operand %q for code %q", numerals, code) |
||||||
|
} |
||||||
|
index = int(i) |
||||||
|
case opObj: |
||||||
|
// no operand
|
||||||
|
default: |
||||||
|
// The suffix must end with a type->object operation.
|
||||||
|
if suffix == "" { |
||||||
|
return nil, fmt.Errorf("invalid path: ends with %q, want [AFMO]", code) |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
if code == opType { |
||||||
|
if t != nil { |
||||||
|
return nil, fmt.Errorf("invalid path: unexpected %q in type context", opType) |
||||||
|
} |
||||||
|
t = obj.Type() |
||||||
|
obj = nil |
||||||
|
continue |
||||||
|
} |
||||||
|
|
||||||
|
if t == nil { |
||||||
|
return nil, fmt.Errorf("invalid path: code %q in object context", code) |
||||||
|
} |
||||||
|
|
||||||
|
// Inv: t != nil, obj == nil
|
||||||
|
|
||||||
|
switch code { |
||||||
|
case opElem: |
||||||
|
hasElem, ok := t.(hasElem) // Pointer, Slice, Array, Chan, Map
|
||||||
|
if !ok { |
||||||
|
return nil, fmt.Errorf("cannot apply %q to %s (got %T, want pointer, slice, array, chan or map)", code, t, t) |
||||||
|
} |
||||||
|
t = hasElem.Elem() |
||||||
|
|
||||||
|
case opKey: |
||||||
|
mapType, ok := t.(*types.Map) |
||||||
|
if !ok { |
||||||
|
return nil, fmt.Errorf("cannot apply %q to %s (got %T, want map)", code, t, t) |
||||||
|
} |
||||||
|
t = mapType.Key() |
||||||
|
|
||||||
|
case opParams: |
||||||
|
sig, ok := t.(*types.Signature) |
||||||
|
if !ok { |
||||||
|
return nil, fmt.Errorf("cannot apply %q to %s (got %T, want signature)", code, t, t) |
||||||
|
} |
||||||
|
t = sig.Params() |
||||||
|
|
||||||
|
case opResults: |
||||||
|
sig, ok := t.(*types.Signature) |
||||||
|
if !ok { |
||||||
|
return nil, fmt.Errorf("cannot apply %q to %s (got %T, want signature)", code, t, t) |
||||||
|
} |
||||||
|
t = sig.Results() |
||||||
|
|
||||||
|
case opUnderlying: |
||||||
|
named, ok := t.(*types.Named) |
||||||
|
if !ok { |
||||||
|
return nil, fmt.Errorf("cannot apply %q to %s (got %s, want named)", code, t, t) |
||||||
|
} |
||||||
|
t = named.Underlying() |
||||||
|
|
||||||
|
case opAt: |
||||||
|
tuple, ok := t.(*types.Tuple) |
||||||
|
if !ok { |
||||||
|
return nil, fmt.Errorf("cannot apply %q to %s (got %s, want tuple)", code, t, t) |
||||||
|
} |
||||||
|
if n := tuple.Len(); index >= n { |
||||||
|
return nil, fmt.Errorf("tuple index %d out of range [0-%d)", index, n) |
||||||
|
} |
||||||
|
obj = tuple.At(index) |
||||||
|
t = nil |
||||||
|
|
||||||
|
case opField: |
||||||
|
structType, ok := t.(*types.Struct) |
||||||
|
if !ok { |
||||||
|
return nil, fmt.Errorf("cannot apply %q to %s (got %T, want struct)", code, t, t) |
||||||
|
} |
||||||
|
if n := structType.NumFields(); index >= n { |
||||||
|
return nil, fmt.Errorf("field index %d out of range [0-%d)", index, n) |
||||||
|
} |
||||||
|
obj = structType.Field(index) |
||||||
|
t = nil |
||||||
|
|
||||||
|
case opMethod: |
||||||
|
hasMethods, ok := t.(hasMethods) // Interface or Named
|
||||||
|
if !ok { |
||||||
|
return nil, fmt.Errorf("cannot apply %q to %s (got %s, want interface or named)", code, t, t) |
||||||
|
} |
||||||
|
if n := hasMethods.NumMethods(); index >= n { |
||||||
|
return nil, fmt.Errorf("method index %d out of range [0-%d)", index, n) |
||||||
|
} |
||||||
|
obj = hasMethods.Method(index) |
||||||
|
t = nil |
||||||
|
|
||||||
|
case opObj: |
||||||
|
named, ok := t.(*types.Named) |
||||||
|
if !ok { |
||||||
|
return nil, fmt.Errorf("cannot apply %q to %s (got %s, want named)", code, t, t) |
||||||
|
} |
||||||
|
obj = named.Obj() |
||||||
|
t = nil |
||||||
|
|
||||||
|
default: |
||||||
|
return nil, fmt.Errorf("invalid path: unknown code %q", code) |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
if obj.Pkg() != pkg { |
||||||
|
return nil, fmt.Errorf("path denotes %s, which belongs to a different package", obj) |
||||||
|
} |
||||||
|
|
||||||
|
return obj, nil // success
|
||||||
|
} |
||||||
Loading…
Reference in new issue