diff options
Diffstat (limited to 'src/runtime/stack_test.go')
| -rw-r--r-- | src/runtime/stack_test.go | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/runtime/stack_test.go b/src/runtime/stack_test.go index c9b84be066..8e7c7d47a8 100644 --- a/src/runtime/stack_test.go +++ b/src/runtime/stack_test.go @@ -5,6 +5,7 @@ package runtime_test import ( + "bytes" "fmt" . "runtime" "strings" @@ -685,3 +686,35 @@ func TestStackWrapperStack(t *testing.T) { t.Fatalf("<autogenerated> appears in stack trace:\n%s", stk) } } + +func TestTracebackSystemstack(t *testing.T) { + if GOARCH == "ppc64" || GOARCH == "ppc64le" { + t.Skip("systemstack tail call not implemented on ppc64x") + } + + // Test that profiles correctly jump over systemstack, + // including nested systemstack calls. + pcs := make([]uintptr, 20) + pcs = pcs[:TracebackSystemstack(pcs, 5)] + // Check that runtime.TracebackSystemstack appears five times + // and that we see TestTracebackSystemstack. + countIn, countOut := 0, 0 + frames := CallersFrames(pcs) + var tb bytes.Buffer + for { + frame, more := frames.Next() + fmt.Fprintf(&tb, "\n%s+0x%x %s:%d", frame.Function, frame.PC-frame.Entry, frame.File, frame.Line) + switch frame.Function { + case "runtime.TracebackSystemstack": + countIn++ + case "runtime_test.TestTracebackSystemstack": + countOut++ + } + if !more { + break + } + } + if countIn != 5 || countOut != 1 { + t.Fatalf("expected 5 calls to TracebackSystemstack and 1 call to TestTracebackSystemstack, got:%s", tb.String()) + } +} |