runtime: convert panic/recover to Go

created panic1.go just so diffs were available.
After this CL is in, I'd like to move panic.go -> defer.go
and panic1.go -> panic.go.

LGTM=rsc
R=rsc, khr
CC=golang-codereviews
https://golang.org/cl/133530045

1 files changed, 15 insertions, 0 deletions

diff --git a/src/pkg/runtime/stack_test.go b/src/pkg/runtime/stack_test.go
index a822d73db4..7b9412af42 100644
--- a/src/pkg/runtime/stack_test.go
+++ b/src/pkg/runtime/stack_test.go
@@ -350,3 +350,18 @@ func TestStackAllOutput(t *testing.T) {
 		t.Errorf("Stack output should begin with \"goroutine \"")
 	}
 }
+
+func TestStackPanic(t *testing.T) {
+	// Test that stack copying copies panics correctly.  This is difficult
+	// to test because it is very unlikely that the stack will be copied
+	// in the middle of gopanic.  But it can happen.
+	// To make this test effective, edit panic.go:gopanic and uncomment
+	// the GC() call just before freedefer(d).
+	defer func() {
+		if x := recover(); x == nil {
+			t.Errorf("recover failed")
+		}
+	}()
+	useStack(32)
+	panic("test panic")
+}