mirror of
https://github.com/golang/go
synced 2024-11-05 17:36:15 -07:00
f895b43688
This removes much of the AST logic out of main.go, and makes it easier to build custom vet binaries The trade-off in this change is for flexibility. There's very little change in the per-check files, a lot less code in main.go (specifically the AST walking logic has shrunk), and it makes it much easier to build custom vet binaries simply by dropping new source files in the directory. LGTM=josharian, r R=r, josharian, kamil.kisiel CC=golang-codereviews https://golang.org/cl/83400043
67 lines
1.6 KiB
Go
67 lines
1.6 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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func init() {
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register("atomic",
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"check for common mistaken usages of the sync/atomic package",
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checkAtomicAssignment,
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assignStmt)
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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 checkAtomicAssignment(f *File, node ast.Node) {
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n := node.(*ast.AssignStmt)
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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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if len(call.Args) != 2 {
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return
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}
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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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