106 lines
2.3 KiB
Go
106 lines
2.3 KiB
Go
package checkcompilerdirectives
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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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func Analyzer() *analysis.Analyzer {
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return &analysis.Analyzer{
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Name: "gocheckcompilerdirectives",
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Doc: "Checks that go compiler directive comments (//go:) are valid.",
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Run: run,
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}
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}
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func run(pass *analysis.Pass) (interface{}, error) {
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for _, file := range pass.Files {
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for _, group := range file.Comments {
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for _, comment := range group.List {
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text := comment.Text
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if !strings.HasPrefix(text, "//") {
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continue
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}
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start := 2
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spaces := 0
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for _, c := range text[start:] {
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if c == ' ' {
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spaces++
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continue
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}
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break
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}
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start += spaces
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if !strings.HasPrefix(text[start:], "go:") {
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continue
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}
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start += 3
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end := strings.Index(text[start:], " ")
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if end == -1 {
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continue
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}
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directive := text[start : start+end]
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if len(directive) == 0 {
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continue
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}
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prefix := text[:start+end]
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// Leading whitespace will cause the go directive to be ignored
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// by the compiler with no error, causing it not to work. This
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// is an easy mistake.
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if spaces > 0 {
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pass.ReportRangef(comment, "compiler directive contains space: %s", prefix)
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}
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// If the directive is unknown it will be ignored by the
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// compiler with no error. This is an easy mistake to make,
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// especially if you typo a directive.
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if !isKnown(directive) {
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pass.ReportRangef(comment, "compiler directive unrecognized: %s", prefix)
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}
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}
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}
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}
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return nil, nil
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}
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func isKnown(directive string) bool {
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for _, k := range known {
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if directive == k {
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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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var known = []string{
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// Found by running the following command on the source of go.
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// git grep -o -E -h '//go:[a-z_]+' -- ':!**/*_test.go' ':!test/' ':!**/testdata/**' | sort -u
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"binary",
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"build",
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"buildsomethingelse",
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"cgo_dynamic_linker",
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"cgo_export_dynamic",
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"cgo_export_static",
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"cgo_import_dynamic",
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"cgo_import_static",
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"cgo_ldflag",
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"cgo_unsafe_args",
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"embed",
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"generate",
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"linkname",
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"name",
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"nocheckptr",
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"noescape",
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"noinline",
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"nointerface",
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"norace",
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"nosplit",
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"notinheap",
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"nowritebarrier",
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"nowritebarrierrec",
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"systemstack",
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"uintptrescapes",
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"uintptrkeepalive",
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"yeswritebarrierrec",
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}
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