some deletions

[dotfiles/.git] / .config / coc / extensions / coc-go-data / tools / pkg / mod / golang.org / x / tools@v0.0.0-20201028153306-37f0764111ff / go / analysis / passes / shift / shift.go

diff --git a/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.0.0-20201028153306-37f0764111ff/go/analysis/passes/shift/shift.go b/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.0.0-20201028153306-37f0764111ff/go/analysis/passes/shift/shift.go
deleted file mode 100644 (file)
index 1f3df07..0000000
--- a/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.0.0-20201028153306-37f0764111ff/go/analysis/passes/shift/shift.go
+++ /dev/null
@@ -1,101 +0,0 @@
-// Copyright 2014 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 shift defines an Analyzer that checks for shifts that exceed
-// the width of an integer.
-package shift
-
-// TODO(adonovan): integrate with ctrflow (CFG-based) dead code analysis. May
-// have impedance mismatch due to its (non-)treatment of constant
-// expressions (such as runtime.GOARCH=="386").
-
-import (
-       "go/ast"
-       "go/constant"
-       "go/token"
-
-       "golang.org/x/tools/go/analysis"
-       "golang.org/x/tools/go/analysis/passes/inspect"
-       "golang.org/x/tools/go/analysis/passes/internal/analysisutil"
-       "golang.org/x/tools/go/ast/inspector"
-)
-
-const Doc = "check for shifts that equal or exceed the width of the integer"
-
-var Analyzer = &analysis.Analyzer{
-       Name:     "shift",
-       Doc:      Doc,
-       Requires: []*analysis.Analyzer{inspect.Analyzer},
-       Run:      run,
-}
-
-func run(pass *analysis.Pass) (interface{}, error) {
-       inspect := pass.ResultOf[inspect.Analyzer].(*inspector.Inspector)
-
-       // Do a complete pass to compute dead nodes.
-       dead := make(map[ast.Node]bool)
-       nodeFilter := []ast.Node{
-               (*ast.IfStmt)(nil),
-               (*ast.SwitchStmt)(nil),
-       }
-       inspect.Preorder(nodeFilter, func(n ast.Node) {
-               // TODO(adonovan): move updateDead into this file.
-               updateDead(pass.TypesInfo, dead, n)
-       })
-
-       nodeFilter = []ast.Node{
-               (*ast.AssignStmt)(nil),
-               (*ast.BinaryExpr)(nil),
-       }
-       inspect.Preorder(nodeFilter, func(node ast.Node) {
-               if dead[node] {
-                       // Skip shift checks on unreachable nodes.
-                       return
-               }
-
-               switch node := node.(type) {
-               case *ast.BinaryExpr:
-                       if node.Op == token.SHL || node.Op == token.SHR {
-                               checkLongShift(pass, node, node.X, node.Y)
-                       }
-               case *ast.AssignStmt:
-                       if len(node.Lhs) != 1 || len(node.Rhs) != 1 {
-                               return
-                       }
-                       if node.Tok == token.SHL_ASSIGN || node.Tok == token.SHR_ASSIGN {
-                               checkLongShift(pass, node, node.Lhs[0], node.Rhs[0])
-                       }
-               }
-       })
-       return nil, nil
-}
-
-// checkLongShift checks if shift or shift-assign operations shift by more than
-// the length of the underlying variable.
-func checkLongShift(pass *analysis.Pass, node ast.Node, x, y ast.Expr) {
-       if pass.TypesInfo.Types[x].Value != nil {
-               // Ignore shifts of constants.
-               // These are frequently used for bit-twiddling tricks
-               // like ^uint(0) >> 63 for 32/64 bit detection and compatibility.
-               return
-       }
-
-       v := pass.TypesInfo.Types[y].Value
-       if v == nil {
-               return
-       }
-       amt, ok := constant.Int64Val(v)
-       if !ok {
-               return
-       }
-       t := pass.TypesInfo.Types[x].Type
-       if t == nil {
-               return
-       }
-       size := 8 * pass.TypesSizes.Sizeof(t)
-       if amt >= size {
-               ident := analysisutil.Format(pass.Fset, x)
-               pass.ReportRangef(node, "%s (%d bits) too small for shift of %d", ident, size, amt)
-       }
-}