go/analysis/passes/bools: split out of vet
And rename from "bool" to "bools". Using analysistest unearthed a minor bug, github.com/golang/go/issues/28086. To avoid complicating the diff we work around it in the tests for now. Change-Id: I682f33506de778dfdfe97841cd2b16e3d47062b8 Reviewed-on: https://go-review.googlesource.com/c/140737 Reviewed-by: Michael Matloob <matloob@golang.org> Run-TryBot: Michael Matloob <matloob@golang.org>
This commit is contained in:
Alan Donovan
parent
3f6d6d9ddd
commit
06b1b3f6e3
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@ -1,26 +1,34 @@
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// +build ignore
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// Copyright 2014 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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// This file contains boolean condition tests.
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package main
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package bools
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import (
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"go/ast"
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"go/token"
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"go/types"
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"golang.org/x/tools/go/analysis"
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"golang.org/x/tools/go/analysis/passes/inspect"
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"golang.org/x/tools/go/analysis/passes/internal/analysisutil"
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"golang.org/x/tools/go/ast/inspector"
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)
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func init() {
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register("bool",
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"check for mistakes involving boolean operators",
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checkBool,
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binaryExpr)
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var Analyzer = &analysis.Analyzer{
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Name: "bools",
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Doc: "check for common mistakes involving boolean operators",
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Requires: []*analysis.Analyzer{inspect.Analyzer},
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Run: run,
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}
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func checkBool(f *File, n ast.Node) {
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func run(pass *analysis.Pass) (interface{}, error) {
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inspect := pass.ResultOf[inspect.Analyzer].(*inspector.Inspector)
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nodeFilter := []ast.Node{
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(*ast.BinaryExpr)(nil),
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}
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inspect.Preorder(nodeFilter, func(n ast.Node) {
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e := n.(*ast.BinaryExpr)
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var op boolOp
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@ -33,11 +41,16 @@ func checkBool(f *File, n ast.Node) {
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return
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}
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comm := op.commutativeSets(f, e)
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// TODO(adonovan): this reports n(n-1)/2 errors for an
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// expression e||...||e of depth n. Fix.
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// See https://github.com/golang/go/issues/28086.
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comm := op.commutativeSets(pass.TypesInfo, e)
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for _, exprs := range comm {
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op.checkRedundant(f, exprs)
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op.checkSuspect(f, exprs)
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op.checkRedundant(pass, exprs)
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op.checkSuspect(pass, exprs)
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}
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})
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return nil, nil
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}
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type boolOp struct {
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@ -55,14 +68,14 @@ var (
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// expressions in e that are connected by op.
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// For example, given 'a || b || f() || c || d' with the or op,
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// commutativeSets returns {{b, a}, {d, c}}.
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func (op boolOp) commutativeSets(f *File, e *ast.BinaryExpr) [][]ast.Expr {
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func (op boolOp) commutativeSets(info *types.Info, e *ast.BinaryExpr) [][]ast.Expr {
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exprs := op.split(e)
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// Partition the slice of expressions into commutative sets.
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i := 0
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var sets [][]ast.Expr
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for j := 0; j <= len(exprs); j++ {
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if j == len(exprs) || hasSideEffects(f, exprs[j]) {
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if j == len(exprs) || hasSideEffects(info, exprs[j]) {
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if i < j {
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sets = append(sets, exprs[i:j])
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}
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@ -77,12 +90,12 @@ func (op boolOp) commutativeSets(f *File, e *ast.BinaryExpr) [][]ast.Expr {
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// e && e
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// e || e
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// Exprs must contain only side effect free expressions.
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func (op boolOp) checkRedundant(f *File, exprs []ast.Expr) {
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func (op boolOp) checkRedundant(pass *analysis.Pass, exprs []ast.Expr) {
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seen := make(map[string]bool)
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for _, e := range exprs {
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efmt := f.gofmt(e)
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efmt := analysisutil.Format(pass.Fset, e)
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if seen[efmt] {
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f.Badf(e.Pos(), "redundant %s: %s %s %s", op.name, efmt, op.tok, efmt)
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pass.Reportf(e.Pos(), "redundant %s: %s %s %s", op.name, efmt, op.tok, efmt)
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} else {
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seen[efmt] = true
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}
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@ -96,7 +109,7 @@ func (op boolOp) checkRedundant(f *File, exprs []ast.Expr) {
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// If c1 and c2 are the same then it's redundant;
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// if c1 and c2 are different then it's always true or always false.
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// Exprs must contain only side effect free expressions.
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func (op boolOp) checkSuspect(f *File, exprs []ast.Expr) {
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func (op boolOp) checkSuspect(pass *analysis.Pass, exprs []ast.Expr) {
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// seen maps from expressions 'x' to equality expressions 'x != c'.
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seen := make(map[string]string)
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@ -115,21 +128,21 @@ func (op boolOp) checkSuspect(f *File, exprs []ast.Expr) {
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// code is written.
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var x ast.Expr
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switch {
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case f.pkg.types[bin.Y].Value != nil:
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case pass.TypesInfo.Types[bin.Y].Value != nil:
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x = bin.X
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case f.pkg.types[bin.X].Value != nil:
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case pass.TypesInfo.Types[bin.X].Value != nil:
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x = bin.Y
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default:
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continue
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}
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// e is of the form 'x != c' or 'x == c'.
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xfmt := f.gofmt(x)
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efmt := f.gofmt(e)
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xfmt := analysisutil.Format(pass.Fset, x)
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efmt := analysisutil.Format(pass.Fset, e)
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if prev, found := seen[xfmt]; found {
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// checkRedundant handles the case in which efmt == prev.
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if efmt != prev {
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f.Badf(e.Pos(), "suspect %s: %s %s %s", op.name, efmt, op.tok, prev)
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pass.Reportf(e.Pos(), "suspect %s: %s %s %s", op.name, efmt, op.tok, prev)
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}
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} else {
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seen[xfmt] = efmt
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@ -138,12 +151,12 @@ func (op boolOp) checkSuspect(f *File, exprs []ast.Expr) {
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}
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// hasSideEffects reports whether evaluation of e has side effects.
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func hasSideEffects(f *File, e ast.Expr) bool {
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func hasSideEffects(info *types.Info, e ast.Expr) bool {
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safe := true
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ast.Inspect(e, func(node ast.Node) bool {
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switch n := node.(type) {
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case *ast.CallExpr:
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typVal := f.pkg.types[n.Fun]
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typVal := info.Types[n.Fun]
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switch {
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case typVal.IsType():
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// Type conversion, which is safe.
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@ -0,0 +1,13 @@
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package bools_test
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import (
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"testing"
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"golang.org/x/tools/go/analysis/analysistest"
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"golang.org/x/tools/go/analysis/passes/bools"
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)
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func TestFromFileSystem(t *testing.T) {
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testdata := analysistest.TestData()
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analysistest.Run(t, testdata, bools.Analyzer, "a")
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}
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@ -0,0 +1,137 @@
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// Copyright 2014 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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// This file contains tests for the bool checker.
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package a
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import "io"
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type T int
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func (t T) Foo() int { return int(t) }
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type FT func() int
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var S []int
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func RatherStupidConditions() {
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var f, g func() int
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if f() == 0 || f() == 0 { // OK f might have side effects
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}
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var t T
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_ = t.Foo() == 2 || t.Foo() == 2 // OK Foo might have side effects
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if v, w := f(), g(); v == w || v == w { // want `redundant or: v == w \|\| v == w`
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}
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_ = f == nil || f == nil // want `redundant or: f == nil \|\| f == nil`
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var B byte
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_ = B == byte(1) || B == byte(1) // want `redundant or: B == byte\(1\) \|\| B == byte\(1\)`
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_ = t == T(2) || t == T(2) // want `redundant or: t == T\(2\) \|\| t == T\(2\)`
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_ = FT(f) == nil || FT(f) == nil // want `redundant or: FT\(f\) == nil \|\| FT\(f\) == nil`
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_ = (func() int)(f) == nil || (func() int)(f) == nil // want `redundant or: \(func\(\) int\)\(f\) == nil \|\| \(func\(\) int\)\(f\) == nil`
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_ = append(S, 3) == nil || append(S, 3) == nil // OK append has side effects
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var namedFuncVar FT
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_ = namedFuncVar() == namedFuncVar() // OK still func calls
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var c chan int
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_ = 0 == <-c || 0 == <-c // OK subsequent receives may yield different values
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for i, j := <-c, <-c; i == j || i == j; i, j = <-c, <-c { // want `redundant or: i == j \|\| i == j`
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}
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var i, j, k int
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_ = i+1 == 1 || i+1 == 1 // want `redundant or: i\+1 == 1 \|\| i\+1 == 1`
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_ = i == 1 || j+1 == i || i == 1 // want `redundant or: i == 1 \|\| i == 1`
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// The various r.* patterns are intended to match duplicate
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// diagnostics reported for the same underlying problem.
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// See github.com/golang/go/issues/28086.
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// TODO(adonovan): fix the checker.
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_ = i == 1 || i == 1 || f() == 1 // want `redundant or: i == 1 \|\| i == 1` `r.*`
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_ = i == 1 || f() == 1 || i == 1 // OK f may alter i as a side effect
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_ = f() == 1 || i == 1 || i == 1 // want `redundant or: i == 1 \|\| i == 1`
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// Test partition edge cases
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_ = f() == 1 || i == 1 || i == 1 || j == 1 // want `redundant or: i == 1 \|\| i == 1` `r.*`
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_ = f() == 1 || j == 1 || i == 1 || i == 1 // want `redundant or: i == 1 \|\| i == 1`
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_ = i == 1 || f() == 1 || i == 1 || i == 1 // want `redundant or: i == 1 \|\| i == 1`
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_ = i == 1 || i == 1 || f() == 1 || i == 1 // want `redundant or: i == 1 \|\| i == 1` `r.*` `r.*`
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_ = i == 1 || i == 1 || j == 1 || f() == 1 // want `redundant or: i == 1 \|\| i == 1` `r.*` `r.*`
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_ = j == 1 || i == 1 || i == 1 || f() == 1 // want `redundant or: i == 1 \|\| i == 1` `r.*`
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_ = i == 1 || f() == 1 || f() == 1 || i == 1
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_ = i == 1 || (i == 1 || i == 2) // want `redundant or: i == 1 \|\| i == 1`
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_ = i == 1 || (f() == 1 || i == 1) // OK f may alter i as a side effect
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_ = i == 1 || (i == 1 || f() == 1) // want `redundant or: i == 1 \|\| i == 1`
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_ = i == 1 || (i == 2 || (i == 1 || i == 3)) // want `redundant or: i == 1 \|\| i == 1`
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var a, b bool
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_ = i == 1 || (a || (i == 1 || b)) // want `redundant or: i == 1 \|\| i == 1`
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// Check that all redundant ors are flagged
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_ = j == 0 ||
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i == 1 ||
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f() == 1 ||
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j == 0 || // want `redundant or: j == 0 \|\| j == 0` `r.*`
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i == 1 || // want `redundant or: i == 1 \|\| i == 1` `r.*` `r.*` `r.*`
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i == 1 || // want `redundant or: i == 1 \|\| i == 1` `r.*` `r.*`
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i == 1 ||
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j == 0 ||
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k == 0
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_ = i == 1*2*3 || i == 1*2*3 // want `redundant or: i == 1\*2\*3 \|\| i == 1\*2\*3`
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// These test that redundant, suspect expressions do not trigger multiple errors.
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_ = i != 0 || i != 0 // want `redundant or: i != 0 \|\| i != 0`
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_ = i == 0 && i == 0 // want `redundant and: i == 0 && i == 0`
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// and is dual to or; check the basics and
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// let the or tests pull the rest of the weight.
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_ = 0 != <-c && 0 != <-c // OK subsequent receives may yield different values
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_ = f() != 0 && f() != 0 // OK f might have side effects
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_ = f != nil && f != nil // want `redundant and: f != nil && f != nil`
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_ = i != 1 && i != 1 && f() != 1 // want `redundant and: i != 1 && i != 1` `r.*`
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_ = i != 1 && f() != 1 && i != 1 // OK f may alter i as a side effect
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_ = f() != 1 && i != 1 && i != 1 // want `redundant and: i != 1 && i != 1`
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}
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func RoyallySuspectConditions() {
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var i, j int
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_ = i == 0 || i == 1 // OK
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_ = i != 0 || i != 1 // want `suspect or: i != 0 \|\| i != 1`
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_ = i != 0 || 1 != i // want `suspect or: i != 0 \|\| 1 != i`
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_ = 0 != i || 1 != i // want `suspect or: 0 != i \|\| 1 != i`
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_ = 0 != i || i != 1 // want `suspect or: 0 != i \|\| i != 1`
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_ = (0 != i) || i != 1 // want `suspect or: 0 != i \|\| i != 1`
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_ = i+3 != 7 || j+5 == 0 || i+3 != 9 // want `suspect or: i\+3 != 7 \|\| i\+3 != 9`
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_ = i != 0 || j == 0 || i != 1 // want `suspect or: i != 0 \|\| i != 1`
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_ = i != 0 || i != 1<<4 // want `suspect or: i != 0 \|\| i != 1<<4`
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_ = i != 0 || j != 0
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_ = 0 != i || 0 != j
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var s string
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_ = s != "one" || s != "the other" // want `suspect or: s != .one. \|\| s != .the other.`
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_ = "et" != "alii" || "et" != "cetera" // want `suspect or: .et. != .alii. \|\| .et. != .cetera.`
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_ = "me gustas" != "tu" || "le gustas" != "tu" // OK we could catch this case, but it's not worth the code
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var err error
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_ = err != nil || err != io.EOF // TODO catch this case?
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// Sanity check and.
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_ = i != 0 && i != 1 // OK
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_ = i == 0 && i == 1 // want `suspect and: i == 0 && i == 1`
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_ = i == 0 && 1 == i // want `suspect and: i == 0 && 1 == i`
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_ = 0 == i && 1 == i // want `suspect and: 0 == i && 1 == i`
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_ = 0 == i && i == 1 // want `suspect and: 0 == i && i == 1`
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}
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|
@ -1,131 +0,0 @@
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// Copyright 2014 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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|
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// This file contains tests for the bool checker.
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package testdata
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import "io"
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type T int
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func (t T) Foo() int { return int(t) }
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type FT func() int
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var S []int
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func RatherStupidConditions() {
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var f, g func() int
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if f() == 0 || f() == 0 { // OK f might have side effects
|
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}
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var t T
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_ = t.Foo() == 2 || t.Foo() == 2 // OK Foo might have side effects
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if v, w := f(), g(); v == w || v == w { // ERROR "redundant or: v == w || v == w"
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}
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_ = f == nil || f == nil // ERROR "redundant or: f == nil || f == nil"
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_ = i == byte(1) || i == byte(1) // ERROR "redundant or: i == byte(1) || i == byte(1)"
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_ = i == T(2) || i == T(2) // ERROR "redundant or: i == T(2) || i == T(2)"
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_ = FT(f) == nil || FT(f) == nil // ERROR "redundant or: FT(f) == nil || FT(f) == nil"
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_ = (func() int)(f) == nil || (func() int)(f) == nil // ERROR "redundant or: (func() int)(f) == nil || (func() int)(f) == nil"
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||||
_ = append(S, 3) == nil || append(S, 3) == nil // OK append has side effects
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||||
|
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var namedFuncVar FT
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_ = namedFuncVar() == namedFuncVar() // OK still func calls
|
||||
|
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var c chan int
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_ = 0 == <-c || 0 == <-c // OK subsequent receives may yield different values
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for i, j := <-c, <-c; i == j || i == j; i, j = <-c, <-c { // ERROR "redundant or: i == j || i == j"
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||||
}
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||||
|
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var i, j, k int
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_ = i+1 == 1 || i+1 == 1 // ERROR "redundant or: i\+1 == 1 || i\+1 == 1"
|
||||
_ = i == 1 || j+1 == i || i == 1 // ERROR "redundant or: i == 1 || i == 1"
|
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|
||||
_ = i == 1 || i == 1 || f() == 1 // ERROR "redundant or: i == 1 || i == 1"
|
||||
_ = i == 1 || f() == 1 || i == 1 // OK f may alter i as a side effect
|
||||
_ = f() == 1 || i == 1 || i == 1 // ERROR "redundant or: i == 1 || i == 1"
|
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|
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// Test partition edge cases
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_ = f() == 1 || i == 1 || i == 1 || j == 1 // ERROR "redundant or: i == 1 || i == 1"
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_ = f() == 1 || j == 1 || i == 1 || i == 1 // ERROR "redundant or: i == 1 || i == 1"
|
||||
_ = i == 1 || f() == 1 || i == 1 || i == 1 // ERROR "redundant or: i == 1 || i == 1"
|
||||
_ = i == 1 || i == 1 || f() == 1 || i == 1 // ERROR "redundant or: i == 1 || i == 1"
|
||||
_ = i == 1 || i == 1 || j == 1 || f() == 1 // ERROR "redundant or: i == 1 || i == 1"
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_ = j == 1 || i == 1 || i == 1 || f() == 1 // ERROR "redundant or: i == 1 || i == 1"
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_ = i == 1 || f() == 1 || f() == 1 || i == 1
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|
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_ = i == 1 || (i == 1 || i == 2) // ERROR "redundant or: i == 1 || i == 1"
|
||||
_ = i == 1 || (f() == 1 || i == 1) // OK f may alter i as a side effect
|
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_ = i == 1 || (i == 1 || f() == 1) // ERROR "redundant or: i == 1 || i == 1"
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||||
_ = i == 1 || (i == 2 || (i == 1 || i == 3)) // ERROR "redundant or: i == 1 || i == 1"
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var a, b bool
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_ = i == 1 || (a || (i == 1 || b)) // ERROR "redundant or: i == 1 || i == 1"
|
||||
|
||||
// Check that all redundant ors are flagged
|
||||
_ = j == 0 ||
|
||||
i == 1 ||
|
||||
f() == 1 ||
|
||||
j == 0 || // ERROR "redundant or: j == 0 || j == 0"
|
||||
i == 1 || // ERROR "redundant or: i == 1 || i == 1"
|
||||
i == 1 || // ERROR "redundant or: i == 1 || i == 1"
|
||||
i == 1 ||
|
||||
j == 0 ||
|
||||
k == 0
|
||||
|
||||
_ = i == 1*2*3 || i == 1*2*3 // ERROR "redundant or: i == 1\*2\*3 || i == 1\*2\*3"
|
||||
|
||||
// These test that redundant, suspect expressions do not trigger multiple errors.
|
||||
_ = i != 0 || i != 0 // ERROR "redundant or: i != 0 || i != 0"
|
||||
_ = i == 0 && i == 0 // ERROR "redundant and: i == 0 && i == 0"
|
||||
|
||||
// and is dual to or; check the basics and
|
||||
// let the or tests pull the rest of the weight.
|
||||
_ = 0 != <-c && 0 != <-c // OK subsequent receives may yield different values
|
||||
_ = f() != 0 && f() != 0 // OK f might have side effects
|
||||
_ = f != nil && f != nil // ERROR "redundant and: f != nil && f != nil"
|
||||
_ = i != 1 && i != 1 && f() != 1 // ERROR "redundant and: i != 1 && i != 1"
|
||||
_ = i != 1 && f() != 1 && i != 1 // OK f may alter i as a side effect
|
||||
_ = f() != 1 && i != 1 && i != 1 // ERROR "redundant and: i != 1 && i != 1"
|
||||
}
|
||||
|
||||
func RoyallySuspectConditions() {
|
||||
var i, j int
|
||||
|
||||
_ = i == 0 || i == 1 // OK
|
||||
_ = i != 0 || i != 1 // ERROR "suspect or: i != 0 || i != 1"
|
||||
_ = i != 0 || 1 != i // ERROR "suspect or: i != 0 || 1 != i"
|
||||
_ = 0 != i || 1 != i // ERROR "suspect or: 0 != i || 1 != i"
|
||||
_ = 0 != i || i != 1 // ERROR "suspect or: 0 != i || i != 1"
|
||||
|
||||
_ = (0 != i) || i != 1 // ERROR "suspect or: 0 != i || i != 1"
|
||||
|
||||
_ = i+3 != 7 || j+5 == 0 || i+3 != 9 // ERROR "suspect or: i\+3 != 7 || i\+3 != 9"
|
||||
|
||||
_ = i != 0 || j == 0 || i != 1 // ERROR "suspect or: i != 0 || i != 1"
|
||||
|
||||
_ = i != 0 || i != 1<<4 // ERROR "suspect or: i != 0 || i != 1<<4"
|
||||
|
||||
_ = i != 0 || j != 0
|
||||
_ = 0 != i || 0 != j
|
||||
|
||||
var s string
|
||||
_ = s != "one" || s != "the other" // ERROR "suspect or: s != .one. || s != .the other."
|
||||
|
||||
_ = "et" != "alii" || "et" != "cetera" // ERROR "suspect or: .et. != .alii. || .et. != .cetera."
|
||||
_ = "me gustas" != "tu" || "le gustas" != "tu" // OK we could catch this case, but it's not worth the code
|
||||
|
||||
var err error
|
||||
_ = err != nil || err != io.EOF // TODO catch this case?
|
||||
|
||||
// Sanity check and.
|
||||
_ = i != 0 && i != 1 // OK
|
||||
_ = i == 0 && i == 1 // ERROR "suspect and: i == 0 && i == 1"
|
||||
_ = i == 0 && 1 == i // ERROR "suspect and: i == 0 && 1 == i"
|
||||
_ = 0 == i && 1 == i // ERROR "suspect and: 0 == i && 1 == i"
|
||||
_ = 0 == i && i == 1 // ERROR "suspect and: 0 == i && i == 1"
|
||||
}
|
||||
Loading…
Reference in New Issue