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[dev.typeparams] cmd/compile: simplify writer.collectDecls
The previous code for walking the syntax AST to find declarations needed to know whether a declaration appeared within block scope, but syntax.Crawl (née syntax.Walk) made that somewhat awkward. This CL simplifies it a little, taking advantage of syntax.Walk's support for keeping per-subtree state. Change-Id: I03c7da8c44bec40f88e983852dc6bbab7e6ac13c Reviewed-on: https://go-review.googlesource.com/c/go/+/330549 Trust: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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@ -1386,89 +1386,111 @@ type typeDeclGen struct {
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gen int
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}
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type fileImports struct {
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importedEmbed, importedUnsafe bool
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}
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type declCollector struct {
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pw *pkgWriter
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typegen *int
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file *fileImports
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withinFunc bool
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}
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func (c *declCollector) Visit(n syntax.Node) syntax.Visitor {
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pw := c.pw
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switch n := n.(type) {
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case *syntax.File:
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pw.checkPragmas(n.Pragma, ir.GoBuildPragma, false)
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case *syntax.ImportDecl:
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pw.checkPragmas(n.Pragma, 0, false)
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switch pkgNameOf(pw.info, n).Imported().Path() {
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case "embed":
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c.file.importedEmbed = true
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case "unsafe":
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c.file.importedUnsafe = true
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}
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case *syntax.ConstDecl:
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pw.checkPragmas(n.Pragma, 0, false)
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case *syntax.FuncDecl:
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pw.checkPragmas(n.Pragma, funcPragmas, false)
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obj := pw.info.Defs[n.Name].(*types2.Func)
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pw.funDecls[obj] = n
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case *syntax.TypeDecl:
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obj := pw.info.Defs[n.Name].(*types2.TypeName)
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d := typeDeclGen{TypeDecl: n}
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if n.Alias {
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pw.checkPragmas(n.Pragma, 0, false)
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} else {
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pw.checkPragmas(n.Pragma, typePragmas, false)
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// Assign a unique ID to function-scoped defined types.
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if !isGlobal(obj) {
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*c.typegen++
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d.gen = *c.typegen
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}
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}
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pw.typDecls[obj] = d
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case *syntax.VarDecl:
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pw.checkPragmas(n.Pragma, 0, true)
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if p, ok := n.Pragma.(*pragmas); ok && len(p.Embeds) > 0 {
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if err := checkEmbed(n, c.file.importedEmbed, c.withinFunc); err != nil {
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pw.errorf(p.Embeds[0].Pos, "%s", err)
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}
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}
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// Workaround for #46208. For variable declarations that
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// declare multiple variables and have an explicit type
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// expression, the type expression is evaluated multiple
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// times. This affects toolstash -cmp, because iexport is
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// sensitive to *types.Type pointer identity.
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if quirksMode() && n.Type != nil {
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tv, ok := pw.info.Types[n.Type]
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assert(ok)
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assert(tv.IsType())
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for _, name := range n.NameList {
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obj := pw.info.Defs[name].(*types2.Var)
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pw.dups.add(obj.Type(), tv.Type)
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}
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}
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case *syntax.BlockStmt:
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if !c.withinFunc {
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copy := *c
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copy.withinFunc = true
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return ©
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}
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}
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return c
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}
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func (pw *pkgWriter) collectDecls(noders []*noder) {
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var typegen int
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for _, p := range noders {
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var importedEmbed, importedUnsafe bool
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var file fileImports
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syntax.Crawl(p.file, func(n syntax.Node) bool {
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switch n := n.(type) {
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case *syntax.File:
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pw.checkPragmas(n.Pragma, ir.GoBuildPragma, false)
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case *syntax.ImportDecl:
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pw.checkPragmas(n.Pragma, 0, false)
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switch pkgNameOf(pw.info, n).Imported().Path() {
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case "embed":
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importedEmbed = true
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case "unsafe":
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importedUnsafe = true
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}
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case *syntax.ConstDecl:
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pw.checkPragmas(n.Pragma, 0, false)
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case *syntax.FuncDecl:
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pw.checkPragmas(n.Pragma, funcPragmas, false)
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obj := pw.info.Defs[n.Name].(*types2.Func)
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pw.funDecls[obj] = n
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case *syntax.TypeDecl:
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obj := pw.info.Defs[n.Name].(*types2.TypeName)
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d := typeDeclGen{TypeDecl: n}
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if n.Alias {
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pw.checkPragmas(n.Pragma, 0, false)
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} else {
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pw.checkPragmas(n.Pragma, typePragmas, false)
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// Assign a unique ID to function-scoped defined types.
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if !isGlobal(obj) {
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typegen++
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d.gen = typegen
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}
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}
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pw.typDecls[obj] = d
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case *syntax.VarDecl:
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pw.checkPragmas(n.Pragma, 0, true)
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if p, ok := n.Pragma.(*pragmas); ok && len(p.Embeds) > 0 {
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obj := pw.info.Defs[n.NameList[0]].(*types2.Var)
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// TODO(mdempsky): isGlobal(obj) gives false positive errors
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// for //go:embed directives on package-scope blank
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// variables.
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if err := checkEmbed(n, importedEmbed, !isGlobal(obj)); err != nil {
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pw.errorf(p.Embeds[0].Pos, "%s", err)
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}
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}
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// Workaround for #46208. For variable declarations that
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// declare multiple variables and have an explicit type
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// expression, the type expression is evaluated multiple
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// times. This affects toolstash -cmp, because iexport is
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// sensitive to *types.Type pointer identity.
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if quirksMode() && n.Type != nil {
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tv, ok := pw.info.Types[n.Type]
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assert(ok)
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assert(tv.IsType())
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for _, name := range n.NameList {
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obj := pw.info.Defs[name].(*types2.Var)
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pw.dups.add(obj.Type(), tv.Type)
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}
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}
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}
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return false
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syntax.Walk(p.file, &declCollector{
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pw: pw,
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typegen: &typegen,
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file: &file,
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})
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pw.cgoPragmas = append(pw.cgoPragmas, p.pragcgobuf...)
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for _, l := range p.linknames {
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if !importedUnsafe {
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if !file.importedUnsafe {
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pw.errorf(l.pos, "//go:linkname only allowed in Go files that import \"unsafe\"")
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continue
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}
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