mirror of
https://github.com/golang/go
synced 2024-10-01 10:38:33 -06:00
01f8cd246d
They will be deleted from their current homes once this has landed. Changes made to import paths to make the code compile, and to find errchk in the right place in cmd/vet's Makefile. TODO in a later CL: tidy up vet. R=golang-dev, gri CC=golang-dev https://golang.org/cl/9495043
60 lines
1.4 KiB
Go
60 lines
1.4 KiB
Go
// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-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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"go/ast"
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"go/token"
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)
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// checkAtomicAssignment walks the assignment statement checking for common
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// mistaken usage of atomic package, such as: x = atomic.AddUint64(&x, 1)
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func (f *File) checkAtomicAssignment(n *ast.AssignStmt) {
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if !vet("atomic") {
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return
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}
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if len(n.Lhs) != len(n.Rhs) {
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return
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}
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for i, right := range n.Rhs {
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call, ok := right.(*ast.CallExpr)
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if !ok {
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continue
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}
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sel, ok := call.Fun.(*ast.SelectorExpr)
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if !ok {
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continue
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}
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pkg, ok := sel.X.(*ast.Ident)
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if !ok || pkg.Name != "atomic" {
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continue
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}
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switch sel.Sel.Name {
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case "AddInt32", "AddInt64", "AddUint32", "AddUint64", "AddUintptr":
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f.checkAtomicAddAssignment(n.Lhs[i], call)
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}
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}
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}
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// checkAtomicAddAssignment walks the atomic.Add* method calls checking for assigning the return value
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// to the same variable being used in the operation
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func (f *File) checkAtomicAddAssignment(left ast.Expr, call *ast.CallExpr) {
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arg := call.Args[0]
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broken := false
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if uarg, ok := arg.(*ast.UnaryExpr); ok && uarg.Op == token.AND {
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broken = f.gofmt(left) == f.gofmt(uarg.X)
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} else if star, ok := left.(*ast.StarExpr); ok {
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broken = f.gofmt(star.X) == f.gofmt(arg)
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}
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if broken {
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f.Warn(left.Pos(), "direct assignment to atomic value")
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}
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}
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