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called.go
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called.go
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package called
import (
"go/types"
"strings"
"github.com/gostaticanalysis/analysisutil"
"golang.org/x/tools/go/analysis"
"golang.org/x/tools/go/analysis/passes/buildssa"
)
var flagFuncs string
var Analyzer = &analysis.Analyzer{
Name: "called",
Doc: Doc,
Run: run,
Requires: []*analysis.Analyzer{
buildssa.Analyzer,
},
}
func init() {
Analyzer.Flags.StringVar(&flagFuncs, "funcs", "", "function or method names which are restricted calling")
}
const Doc = "called find callings specified by called.funcs flag"
func run(pass *analysis.Pass) (interface{}, error) {
if flagFuncs == "" {
return nil, nil
}
fs := restrictedFuncs(pass, flagFuncs)
if len(fs) == 0 {
return nil, nil
}
pass.Report = analysisutil.ReportWithoutIgnore(pass)
srcFuncs := pass.ResultOf[buildssa.Analyzer].(*buildssa.SSA).SrcFuncs
for _, sf := range srcFuncs {
for _, b := range sf.Blocks {
for _, instr := range b.Instrs {
for _, f := range fs {
if analysisutil.Called(instr, nil, f) {
pass.Reportf(instr.Pos(), "%s must not be called", f.FullName())
break
}
}
}
}
}
return nil, nil
}
func restrictedFuncs(pass *analysis.Pass, names string) []*types.Func {
var fs []*types.Func
for _, fn := range strings.Split(names, ",") {
ss := strings.Split(strings.TrimSpace(fn), ".")
// package function: pkgname.Func
if len(ss) < 2 {
continue
}
f, _ := analysisutil.ObjectOf(pass, ss[0], ss[1]).(*types.Func)
if f != nil {
fs = append(fs, f)
continue
}
// method: (*pkgname.Type).Method
if len(ss) < 3 {
continue
}
pkgname := strings.TrimLeft(ss[0], "(")
typename := strings.TrimRight(ss[1], ")")
if pkgname != "" && pkgname[0] == '*' {
pkgname = pkgname[1:]
typename = "*" + typename
}
typ := analysisutil.TypeOf(pass, pkgname, typename)
if typ == nil {
continue
}
m := analysisutil.MethodOf(typ, ss[2])
if m != nil {
fs = append(fs, m)
}
}
return fs
}