52 lines
1.2 KiB
Go
52 lines
1.2 KiB
Go
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package sa4012
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import (
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"honnef.co/go/tools/analysis/lint"
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"honnef.co/go/tools/analysis/report"
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"honnef.co/go/tools/go/ir"
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"honnef.co/go/tools/go/ir/irutil"
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"honnef.co/go/tools/internal/passes/buildir"
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"golang.org/x/tools/go/analysis"
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)
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var SCAnalyzer = lint.InitializeAnalyzer(&lint.Analyzer{
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Analyzer: &analysis.Analyzer{
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Name: "SA4012",
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Run: run,
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Requires: []*analysis.Analyzer{buildir.Analyzer},
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},
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Doc: &lint.RawDocumentation{
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Title: `Comparing a value against NaN even though no value is equal to NaN`,
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Since: "2017.1",
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Severity: lint.SeverityWarning,
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MergeIf: lint.MergeIfAny,
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},
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})
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var Analyzer = SCAnalyzer.Analyzer
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func run(pass *analysis.Pass) (any, error) {
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isNaN := func(v ir.Value) bool {
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call, ok := v.(*ir.Call)
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if !ok {
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return false
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}
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return irutil.IsCallTo(call.Common(), "math.NaN")
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}
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for _, fn := range pass.ResultOf[buildir.Analyzer].(*buildir.IR).SrcFuncs {
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for _, block := range fn.Blocks {
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for _, ins := range block.Instrs {
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ins, ok := ins.(*ir.BinOp)
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if !ok {
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continue
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}
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if isNaN(irutil.Flatten(ins.X)) || isNaN(irutil.Flatten(ins.Y)) {
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report.Report(pass, ins, "no value is equal to NaN, not even NaN itself")
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}
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}
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}
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}
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return nil, nil
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}
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