diff options
Diffstat (limited to 'vendor/golang.org/x/tools/go/ast/inspector/typeof.go')
| -rw-r--r-- | vendor/golang.org/x/tools/go/ast/inspector/typeof.go | 216 |
1 files changed, 0 insertions, 216 deletions
diff --git a/vendor/golang.org/x/tools/go/ast/inspector/typeof.go b/vendor/golang.org/x/tools/go/ast/inspector/typeof.go deleted file mode 100644 index d61301b13..000000000 --- a/vendor/golang.org/x/tools/go/ast/inspector/typeof.go +++ /dev/null @@ -1,216 +0,0 @@ -package inspector - -// This file defines func typeOf(ast.Node) uint64. -// -// The initial map-based implementation was too slow; -// see https://go-review.googlesource.com/c/tools/+/135655/1/go/ast/inspector/inspector.go#196 - -import "go/ast" - -const ( - nArrayType = iota - nAssignStmt - nBadDecl - nBadExpr - nBadStmt - nBasicLit - nBinaryExpr - nBlockStmt - nBranchStmt - nCallExpr - nCaseClause - nChanType - nCommClause - nComment - nCommentGroup - nCompositeLit - nDeclStmt - nDeferStmt - nEllipsis - nEmptyStmt - nExprStmt - nField - nFieldList - nFile - nForStmt - nFuncDecl - nFuncLit - nFuncType - nGenDecl - nGoStmt - nIdent - nIfStmt - nImportSpec - nIncDecStmt - nIndexExpr - nInterfaceType - nKeyValueExpr - nLabeledStmt - nMapType - nPackage - nParenExpr - nRangeStmt - nReturnStmt - nSelectStmt - nSelectorExpr - nSendStmt - nSliceExpr - nStarExpr - nStructType - nSwitchStmt - nTypeAssertExpr - nTypeSpec - nTypeSwitchStmt - nUnaryExpr - nValueSpec -) - -// typeOf returns a distinct single-bit value that represents the type of n. -// -// Various implementations were benchmarked with BenchmarkNewInspector: -// GOGC=off -// - type switch 4.9-5.5ms 2.1ms -// - binary search over a sorted list of types 5.5-5.9ms 2.5ms -// - linear scan, frequency-ordered list 5.9-6.1ms 2.7ms -// - linear scan, unordered list 6.4ms 2.7ms -// - hash table 6.5ms 3.1ms -// A perfect hash seemed like overkill. -// -// The compiler's switch statement is the clear winner -// as it produces a binary tree in code, -// with constant conditions and good branch prediction. -// (Sadly it is the most verbose in source code.) -// Binary search suffered from poor branch prediction. -// -func typeOf(n ast.Node) uint64 { - // Fast path: nearly half of all nodes are identifiers. - if _, ok := n.(*ast.Ident); ok { - return 1 << nIdent - } - - // These cases include all nodes encountered by ast.Inspect. - switch n.(type) { - case *ast.ArrayType: - return 1 << nArrayType - case *ast.AssignStmt: - return 1 << nAssignStmt - case *ast.BadDecl: - return 1 << nBadDecl - case *ast.BadExpr: - return 1 << nBadExpr - case *ast.BadStmt: - return 1 << nBadStmt - case *ast.BasicLit: - return 1 << nBasicLit - case *ast.BinaryExpr: - return 1 << nBinaryExpr - case *ast.BlockStmt: - return 1 << nBlockStmt - case *ast.BranchStmt: - return 1 << nBranchStmt - case *ast.CallExpr: - return 1 << nCallExpr - case *ast.CaseClause: - return 1 << nCaseClause - case *ast.ChanType: - return 1 << nChanType - case *ast.CommClause: - return 1 << nCommClause - case *ast.Comment: - return 1 << nComment - case *ast.CommentGroup: - return 1 << nCommentGroup - case *ast.CompositeLit: - return 1 << nCompositeLit - case *ast.DeclStmt: - return 1 << nDeclStmt - case *ast.DeferStmt: - return 1 << nDeferStmt - case *ast.Ellipsis: - return 1 << nEllipsis - case *ast.EmptyStmt: - return 1 << nEmptyStmt - case *ast.ExprStmt: - return 1 << nExprStmt - case *ast.Field: - return 1 << nField - case *ast.FieldList: - return 1 << nFieldList - case *ast.File: - return 1 << nFile - case *ast.ForStmt: - return 1 << nForStmt - case *ast.FuncDecl: - return 1 << nFuncDecl - case *ast.FuncLit: - return 1 << nFuncLit - case *ast.FuncType: - return 1 << nFuncType - case *ast.GenDecl: - return 1 << nGenDecl - case *ast.GoStmt: - return 1 << nGoStmt - case *ast.Ident: - return 1 << nIdent - case *ast.IfStmt: - return 1 << nIfStmt - case *ast.ImportSpec: - return 1 << nImportSpec - case *ast.IncDecStmt: - return 1 << nIncDecStmt - case *ast.IndexExpr: - return 1 << nIndexExpr - case *ast.InterfaceType: - return 1 << nInterfaceType - case *ast.KeyValueExpr: - return 1 << nKeyValueExpr - case *ast.LabeledStmt: - return 1 << nLabeledStmt - case *ast.MapType: - return 1 << nMapType - case *ast.Package: - return 1 << nPackage - case *ast.ParenExpr: - return 1 << nParenExpr - case *ast.RangeStmt: - return 1 << nRangeStmt - case *ast.ReturnStmt: - return 1 << nReturnStmt - case *ast.SelectStmt: - return 1 << nSelectStmt - case *ast.SelectorExpr: - return 1 << nSelectorExpr - case *ast.SendStmt: - return 1 << nSendStmt - case *ast.SliceExpr: - return 1 << nSliceExpr - case *ast.StarExpr: - return 1 << nStarExpr - case *ast.StructType: - return 1 << nStructType - case *ast.SwitchStmt: - return 1 << nSwitchStmt - case *ast.TypeAssertExpr: - return 1 << nTypeAssertExpr - case *ast.TypeSpec: - return 1 << nTypeSpec - case *ast.TypeSwitchStmt: - return 1 << nTypeSwitchStmt - case *ast.UnaryExpr: - return 1 << nUnaryExpr - case *ast.ValueSpec: - return 1 << nValueSpec - } - return 0 -} - -func maskOf(nodes []ast.Node) uint64 { - if nodes == nil { - return 1<<64 - 1 // match all node types - } - var mask uint64 - for _, n := range nodes { - mask |= typeOf(n) - } - return mask -} |