mirror of
https://github.com/golang/go
synced 2024-11-19 10:44:47 -07:00
95c9b7bad1
Over time, a number of modules were added that used Warn instead of Bad to report problems with the code, but the documentation states that if there is a problem, the exit code must be 1, not 0. Warn does not set the exit code and should be used only for internal errors and messages triggered by the -v flag. There's nothing substantive here except calling the other function in a few places. Fixes golang/go#7017. LGTM=crawshaw R=golang-codereviews, crawshaw CC=golang-codereviews https://golang.org/cl/71860044
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.Bad(left.Pos(), "direct assignment to atomic value")
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}
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}
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