Add staticcheck tool

vendor/honnef.co/go/tools/staticcheck/sa1003/sa1003.go

@@ -0,0 +1,92 @@
+package sa1003
+
+import (
+	"fmt"
+	"go/types"
+	"go/version"
+
+	"honnef.co/go/tools/analysis/callcheck"
+	"honnef.co/go/tools/analysis/code"
+	"honnef.co/go/tools/analysis/lint"
+	"honnef.co/go/tools/internal/passes/buildir"
+	"honnef.co/go/tools/knowledge"
+
+	"golang.org/x/tools/go/analysis"
+)
+
+var SCAnalyzer = lint.InitializeAnalyzer(&lint.Analyzer{
+	Analyzer: &analysis.Analyzer{
+		Name:     "SA1003",
+		Requires: []*analysis.Analyzer{buildir.Analyzer},
+		Run:      callcheck.Analyzer(checkEncodingBinaryRules),
+	},
+	Doc: &lint.RawDocumentation{
+		Title: `Unsupported argument to functions in \'encoding/binary\'`,
+		Text: `The \'encoding/binary\' package can only serialize types with known sizes.
+This precludes the use of the \'int\' and \'uint\' types, as their sizes
+differ on different architectures. Furthermore, it doesn't support
+serializing maps, channels, strings, or functions.
+
+Before Go 1.8, \'bool\' wasn't supported, either.`,
+		Since:    "2017.1",
+		Severity: lint.SeverityError,
+		MergeIf:  lint.MergeIfAny,
+	},
+})
+
+var Analyzer = SCAnalyzer.Analyzer
+
+var checkEncodingBinaryRules = map[string]callcheck.Check{
+	"encoding/binary.Write": func(call *callcheck.Call) {
+		arg := call.Args[knowledge.Arg("encoding/binary.Write.data")]
+		if !CanBinaryMarshal(call.Pass, call.Parent, arg.Value) {
+			arg.Invalid(fmt.Sprintf("value of type %s cannot be used with binary.Write", arg.Value.Value.Type()))
+		}
+	},
+}
+
+func CanBinaryMarshal(pass *analysis.Pass, node code.Positioner, v callcheck.Value) bool {
+	typ := v.Value.Type().Underlying()
+	if ttyp, ok := typ.(*types.Pointer); ok {
+		typ = ttyp.Elem().Underlying()
+	}
+	if ttyp, ok := types.Unalias(typ).(interface {
+		Elem() types.Type
+	}); ok {
+		if _, ok := ttyp.(*types.Pointer); !ok {
+			typ = ttyp.Elem()
+		}
+	}
+
+	return validEncodingBinaryType(pass, node, typ)
+}
+
+func validEncodingBinaryType(pass *analysis.Pass, node code.Positioner, typ types.Type) bool {
+	typ = typ.Underlying()
+	switch typ := typ.(type) {
+	case *types.Basic:
+		switch typ.Kind() {
+		case types.Uint8, types.Uint16, types.Uint32, types.Uint64,
+			types.Int8, types.Int16, types.Int32, types.Int64,
+			types.Float32, types.Float64, types.Complex64, types.Complex128, types.Invalid:
+			return true
+		case types.Bool:
+			return version.Compare(code.StdlibVersion(pass, node), "go1.8") >= 0
+		}
+		return false
+	case *types.Struct:
+		n := typ.NumFields()
+		for i := range n {
+			if !validEncodingBinaryType(pass, node, typ.Field(i).Type()) {
+				return false
+			}
+		}
+		return true
+	case *types.Array:
+		return validEncodingBinaryType(pass, node, typ.Elem())
+	case *types.Interface:
+		// we can't determine if it's a valid type or not
+		return true
+	}
+	return false
+}