proc/variables: bugfix: infinite loading loop through maps

Fixes #341

_fixtures/testvariables3.go

@@ -46,6 +46,8 @@ type dstruct struct {
 	x interface{}
 }
 
+type maptype map[string]interface{}
+
 func main() {
 	i1 := 1
 	i2 := 2
@@ -134,6 +136,8 @@ func main() {
 	var iface5 interface{} = &recursive1
 	var iface2fn1 interface{} = afunc1
 	var iface2fn2 interface{} = afunc2
+	var mapinf maptype = map[string]interface{}{}
+	mapinf["inf"] = mapinf
 
 	var amb1 = 1
 	runtime.Breakpoint()
@@ -141,5 +145,5 @@ func main() {
 		fmt.Println(amb1)
 	}
 	runtime.Breakpoint()
-	fmt.Println(i1, i2, i3, p1, amb1, s1, s3, a1, p2, p3, s2, as1, str1, f1, fn1, fn2, nilslice, nilptr, ch1, chnil, m1, mnil, m2, m3, up1, i4, i5, i6, err1, err2, errnil, iface1, iface2, ifacenil, arr1, parr, cpx1, const1, iface3, iface4, recursive1, recursive1.x, iface5, iface2fn1, iface2fn2)
+	fmt.Println(i1, i2, i3, p1, amb1, s1, s3, a1, p2, p3, s2, as1, str1, f1, fn1, fn2, nilslice, nilptr, ch1, chnil, m1, mnil, m2, m3, up1, i4, i5, i6, err1, err2, errnil, iface1, iface2, ifacenil, arr1, parr, cpx1, const1, iface3, iface4, recursive1, recursive1.x, iface5, iface2fn1, iface2fn2, mapinf)
 }

proc/proc_test.go

@@ -1264,3 +1264,14 @@ func TestIssue262(t *testing.T) {
 		}
 	})
 }
+
+func TestIssue341(t *testing.T) {
+	// pointer loop through map entries
+	withTestProcess("testvariables3", t, func(p *Process, fixture protest.Fixture) {
+		assertNoError(p.Continue(), t, "Continue()")
+		t.Logf("requesting mapinf")
+		mapinf, err := evalVariable(p, "mapinf")
+		assertNoError(err, t, "EvalVariable()")
+		t.Logf("mapinf: %v\n", mapinf)
+	})
+}

proc/variables.go

@@ -1160,8 +1160,10 @@ func (v *Variable) loadMap(recurseLevel int) {
 		}
 		key := it.key()
 		val := it.value()
-		key.loadValue()
-		val.loadValue()
+		if recurseLevel <= maxVariableRecurse {
+			key.loadValueInternal(recurseLevel + 1)
+			val.loadValueInternal(recurseLevel + 1)
+		}
 		if key.Unreadable != nil || val.Unreadable != nil {
 			errcount++
 		}
@@ -1428,7 +1430,7 @@ func (v *Variable) loadInterface(recurseLevel int, loadData bool) {
 		// interface to nil
 		data = data.maybeDereference()
 		v.Children = []Variable{*data}
-		v.Children[0].loadValue()
+		v.Children[0].loadValueInternal(recurseLevel)
 		return
 	}