validate canons without yatest_common

1 files changed, 69 insertions, 0 deletions

diff --git a/library/go/x/xruntime/stacktrace.go b/library/go/x/xruntime/stacktrace.go
new file mode 100644
index 00000000000..5c5e661188f
--- /dev/null
+++ b/library/go/x/xruntime/stacktrace.go
@@ -0,0 +1,69 @@
+package xruntime
+
+import (
+	"runtime"
+)
+
+type StackTrace struct {
+	frames []uintptr
+	full   bool
+}
+
+func NewStackTrace16(skip int) *StackTrace {
+	var pcs [16]uintptr
+	return newStackTrace(skip+2, pcs[:])
+}
+
+func NewStackTrace32(skip int) *StackTrace {
+	var pcs [32]uintptr
+	return newStackTrace(skip+2, pcs[:])
+}
+
+func NewStackTrace64(skip int) *StackTrace {
+	var pcs [64]uintptr
+	return newStackTrace(skip+2, pcs[:])
+}
+
+func NewStackTrace128(skip int) *StackTrace {
+	var pcs [128]uintptr
+	return newStackTrace(skip+2, pcs[:])
+}
+
+func newStackTrace(skip int, pcs []uintptr) *StackTrace {
+	n := runtime.Callers(skip+1, pcs)
+	return &StackTrace{frames: pcs[:n], full: true}
+}
+
+func NewFrame(skip int) *StackTrace {
+	var pcs [3]uintptr
+	n := runtime.Callers(skip+1, pcs[:])
+	return &StackTrace{frames: pcs[:n]}
+}
+
+func (st *StackTrace) Frames() []runtime.Frame {
+	frames := runtime.CallersFrames(st.frames[:])
+	if !st.full {
+		if _, ok := frames.Next(); !ok {
+			return nil
+		}
+
+		fr, ok := frames.Next()
+		if !ok {
+			return nil
+		}
+
+		return []runtime.Frame{fr}
+	}
+
+	var res []runtime.Frame
+	for {
+		frame, more := frames.Next()
+		if !more {
+			break
+		}
+
+		res = append(res, frame)
+	}
+
+	return res
+}