runtime: fix TestCallersNilPointerPanic

The expected result of TestCallersNilPointerPanic has changed in
GoLLVM.  This CL makes some elements of the expected result optional
so that this test passes in both gccgo and GoLLVM.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/230138

gcc/go/gofrontend/MERGE

-8645632618262d1661ece0c9e6fe9e04c6e3a878
+876bdf3df3bb33dbf1414237d84be5da32a48082
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/go/runtime/callers_test.go

@@ -67,7 +67,7 @@ func testCallers(t *testing.T, pcs []uintptr, pan bool) {
 	}
 }
 
-func testCallersEqual(t *testing.T, pcs []uintptr, want []string) {
+func testCallersEqual(t *testing.T, pcs []uintptr, want []string, ignore map[string]struct{}) {
 	got := make([]string, 0, len(want))
 
 	frames := runtime.CallersFrames(pcs)
@@ -76,7 +76,9 @@ func testCallersEqual(t *testing.T, pcs []uintptr, want []string) {
 		if !more || len(got) >= len(want) {
 			break
 		}
-		got = append(got, frame.Function)
+		if _, ok := ignore[frame.Function]; !ok {
+			got = append(got, frame.Function)
+		}
 	}
 	if !reflect.DeepEqual(want, got) {
 		t.Fatalf("wanted %v, got %v", want, got)
@@ -106,7 +108,7 @@ func TestCallersPanic(t *testing.T) {
 		pcs := make([]uintptr, 20)
 		pcs = pcs[:runtime.Callers(0, pcs)]
 		testCallers(t, pcs, true)
-		testCallersEqual(t, pcs, want)
+		testCallersEqual(t, pcs, want, nil)
 	}()
 	f1(true)
 }
@@ -128,7 +130,7 @@ func TestCallersDoublePanic(t *testing.T) {
 			if recover() == nil {
 				t.Fatal("did not panic")
 			}
-			testCallersEqual(t, pcs, want)
+			testCallersEqual(t, pcs, want, nil)
 		}()
 		if recover() == nil {
 			t.Fatal("did not panic")
@@ -149,7 +151,7 @@ func TestCallersAfterRecovery(t *testing.T) {
 	defer func() {
 		pcs := make([]uintptr, 20)
 		pcs = pcs[:runtime.Callers(0, pcs)]
-		testCallersEqual(t, pcs, want)
+		testCallersEqual(t, pcs, want, nil)
 	}()
 	defer func() {
 		if recover() == nil {
@@ -177,7 +179,7 @@ func TestCallersAbortedPanic(t *testing.T) {
 		// recovered, there is no remaining panic on the stack.
 		pcs := make([]uintptr, 20)
 		pcs = pcs[:runtime.Callers(0, pcs)]
-		testCallersEqual(t, pcs, want)
+		testCallersEqual(t, pcs, want, nil)
 	}()
 	defer func() {
 		r := recover()
@@ -208,7 +210,7 @@ func TestCallersAbortedPanic2(t *testing.T) {
 	defer func() {
 		pcs := make([]uintptr, 20)
 		pcs = pcs[:runtime.Callers(0, pcs)]
-		testCallersEqual(t, pcs, want)
+		testCallersEqual(t, pcs, want, nil)
 	}()
 	func() {
 		defer func() {
@@ -233,10 +235,16 @@ func TestCallersNilPointerPanic(t *testing.T) {
 	want := []string{"runtime.Callers", "runtime_test.TestCallersNilPointerPanic.func1",
 		"runtime.gopanic", "runtime.panicmem", "runtime.sigpanic",
 		"runtime_test.TestCallersNilPointerPanic"}
+	ign := make(map[string]struct{})
 	if runtime.Compiler == "gccgo" {
+		// The expected results of gollvm and gccgo are slightly different, the result
+		// of gccgo does not contain tRunner, and the result of gollvm does not contain
+		// sigpanic. Make these two elementes optional to pass both of gollvm and gccgo.
 		want = []string{"runtime.Callers", "runtime_test.TestCallersNilPointerPanic..func1",
-			"runtime.gopanic", "runtime.panicmem", "runtime.sigpanic",
+			"runtime.gopanic", "runtime.panicmem",
 			"runtime_test.TestCallersNilPointerPanic"}
+		ign["runtime.sigpanic"] = struct{}{}
+		ign["testing.tRunner"] = struct{}{}
 	}
 
 	defer func() {
@@ -245,7 +253,7 @@ func TestCallersNilPointerPanic(t *testing.T) {
 		}
 		pcs := make([]uintptr, 20)
 		pcs = pcs[:runtime.Callers(0, pcs)]
-		testCallersEqual(t, pcs, want)
+		testCallersEqual(t, pcs, want, ign)
 	}()
 	var p *int
 	if *p == 3 {
@@ -271,7 +279,7 @@ func TestCallersDivZeroPanic(t *testing.T) {
 		}
 		pcs := make([]uintptr, 20)
 		pcs = pcs[:runtime.Callers(0, pcs)]
-		testCallersEqual(t, pcs, want)
+		testCallersEqual(t, pcs, want, nil)
 	}()
 	var n int
 	if 5/n == 1 {
@@ -298,7 +306,7 @@ func TestCallersDeferNilFuncPanic(t *testing.T) {
 		}
 		pcs := make([]uintptr, 20)
 		pcs = pcs[:runtime.Callers(0, pcs)]
-		testCallersEqual(t, pcs, want)
+		testCallersEqual(t, pcs, want, nil)
 		if state == 1 {
 			t.Fatal("nil defer func panicked at defer time rather than function exit time")
 		}
@@ -328,7 +336,7 @@ func TestCallersDeferNilFuncPanicWithLoop(t *testing.T) {
 		}
 		pcs := make([]uintptr, 20)
 		pcs = pcs[:runtime.Callers(0, pcs)]
-		testCallersEqual(t, pcs, want)
+		testCallersEqual(t, pcs, want, nil)
 		if state == 1 {
 			t.Fatal("nil defer func panicked at defer time rather than function exit time")
 		}