fix: don't report issue related to invalid position

.gitignore

@@ -16,3 +16,5 @@
 
 .idea
 .DS_Store
+
+/contextcheck

Makefile

@@ -1,5 +1,15 @@
+.PHONY: clean test build
+
+default: test build
+
+clean:
+	rm -rf dist/ cover.out
+
+test: clean
+	go test -v -cover ./...
+
 build:
-	@GO111MODULE=on go build -ldflags '-s -w' -o contextcheck ./cmd/contextcheck/main.go
+	go  build -ldflags '-s -w' -o contextcheck ./cmd/contextcheck/main.go
 
 install:
-	@GO111MODULE=on go install -ldflags '-s -w' ./cmd/contextcheck
+	go install -ldflags '-s -w' ./cmd/contextcheck

contextcheck.go

@@ -456,15 +456,15 @@ func (r *runner) collectCtxRef(f *ssa.Function, isHttpHandler bool) (refMap map[
 
 	for instr := range storeInstrs {
 		if !checkedRefMap[instr.Val] {
-			r.pass.Reportf(instr.Pos(), "Non-inherited new context, use function like `context.WithXXX` instead")
+			r.Reportf(instr, "Non-inherited new context, use function like `context.WithXXX` instead")
 			ok = false
 		}
 	}
 
 	for instr := range phiInstrs {
 		for _, v := range instr.Edges {
 			if !checkedRefMap[v] {
-				r.pass.Reportf(instr.Pos(), "Non-inherited new context, use function like `context.WithXXX` instead")
+				r.Reportf(instr, "Non-inherited new context, use function like `context.WithXXX` instead")
 				ok = false
 			}
 		}
@@ -564,9 +564,9 @@ func (r *runner) checkFuncWithCtx(f *ssa.Function, tp entryType) {
 			if tp&CtxIn != 0 {
 				if !refMap[instr] {
 					if isHttpHandler {
-						r.pass.Reportf(instr.Pos(), "Non-inherited new context, use function like `context.WithXXX` or `r.Context` instead")
+						r.Reportf(instr, "Non-inherited new context, use function like `context.WithXXX` or `r.Context` instead")
 					} else {
-						r.pass.Reportf(instr.Pos(), "Non-inherited new context, use function like `context.WithXXX` instead")
+						r.Reportf(instr, "Non-inherited new context, use function like `context.WithXXX` instead")
 					}
 				}
 			}
@@ -580,13 +580,42 @@ func (r *runner) checkFuncWithCtx(f *ssa.Function, tp entryType) {
 			res, ok := r.getValue(key, ff)
 			if ok {
 				if !res.Valid {
-					r.pass.Reportf(instr.Pos(), "Function `%s` should pass the context parameter", strings.Join(reverse(res.Funcs), "->"))
+					r.Reportf(instr, "Function `%s` should pass the context parameter", strings.Join(reverse(res.Funcs), "->"))
 				}
 			}
 		}
 	}
 }
 
+func (r *runner) Reportf(instr ssa.Instruction, format string, args ...interface{}) {
+	pos := instr.Pos()
+
+	if !pos.IsValid() && instr.Block() != nil {
+		if closure, ok := instr.(*ssa.MakeClosure); ok {
+			for _, in := range closure.Block().Instrs {
+				if !in.Pos().IsValid() {
+					continue
+				}
+
+				if r, ok := in.(*ssa.Return); ok {
+					pos = r.Pos()
+					break
+				}
+			}
+		}
+	}
+
+	if !pos.IsValid() && instr.Parent() != nil {
+		pos = instr.Parent().Pos()
+	}
+
+	if !pos.IsValid() {
+		return
+	}
+
+	r.pass.Reportf(pos, format, args...)
+}
+
 func (r *runner) checkFuncWithoutCtx(f *ssa.Function, checkingMap map[string]bool) (ret bool) {
 	ret = true
 	orgKey := f.RelString(nil)

go.mod

@@ -4,11 +4,10 @@ go 1.20
 
 require (
 	github.com/gostaticanalysis/analysisutil v0.7.1
-	golang.org/x/tools v0.8.0
+	golang.org/x/tools v0.19.0
 )
 
 require (
 	github.com/gostaticanalysis/comment v1.4.2 // indirect
-	golang.org/x/mod v0.10.0 // indirect
-	golang.org/x/sys v0.7.0 // indirect
+	golang.org/x/mod v0.16.0 // indirect
 )

go.sum

@@ -24,20 +24,18 @@ golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACk
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/mod v0.4.1/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
-golang.org/x/mod v0.10.0 h1:lFO9qtOdlre5W1jxS3r/4szv2/6iXxScdzjoBMXNhYk=
-golang.org/x/mod v0.10.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/mod v0.16.0 h1:QX4fJ0Rr5cPQCF7O9lh9Se4pmwfwskqZfq5moyldzic=
+golang.org/x/mod v0.16.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
+golang.org/x/sync v0.6.0 h1:5BMeUDZ7vkXGfEr1x9B4bRcTH4lpkTkpdh0T/J+qjbQ=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.7.0 h1:3jlCCIQZPdOYu1h8BkNvLz8Kgwtae2cagcG/VamtZRU=
-golang.org/x/sys v0.7.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/text v0.3.3 h1:cokOdA+Jmi5PJGXLlLllQSgYigAEfHXJAERHVMaCc2k=
@@ -46,8 +44,8 @@ golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGm
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.1.1-0.20210205202024-ef80cdb6ec6d/go.mod h1:9bzcO0MWcOuT0tm1iBGzDVPshzfwoVvREIui8C+MHqU=
 golang.org/x/tools v0.1.1-0.20210302220138-2ac05c832e1a/go.mod h1:9bzcO0MWcOuT0tm1iBGzDVPshzfwoVvREIui8C+MHqU=
-golang.org/x/tools v0.8.0 h1:vSDcovVPld282ceKgDimkRSC8kpaH1dgyc9UMzlt84Y=
-golang.org/x/tools v0.8.0/go.mod h1:JxBZ99ISMI5ViVkT1tr6tdNmXeTrcpVSD3vZ1RsRdN4=
+golang.org/x/tools v0.19.0 h1:tfGCXNR1OsFG+sVdLAitlpjAvD/I6dHDKnYrpEZUHkw=
+golang.org/x/tools v0.19.0/go.mod h1:qoJWxmGSIBmAeriMx19ogtrEPrGtDbPK634QFIcLAhc=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

testdata/src/a/a.go

@@ -155,3 +155,19 @@ func f13[T int | int8 | int16 | int32 | int64 | uint | uint8 | uint16 | uint32 |
 
 	return b
 }
+
+/* ----------------- issue 21 ----------------- */
+
+func f16(ctx context.Context, k string) func() {
+	return func() { // want "Function `f16\\$1` should pass the context parameter"
+		f16(context.Background(), k)
+	}
+}
+
+func f17(ctx context.Context, k string) func() func() {
+	return func() func() { // want "Function `f17\\$1->f17\\$1\\$1` should pass the context parameter"
+		return func() {
+			f16(context.Background(), k)
+		}
+	}
+}