initial commit

calltrace.go

@@ -0,0 +1,46 @@
+package adverr
+
+import (
+	"runtime"
+	"strconv"
+	"strings"
+)
+
+// CallTrace represents a call stack trace similar to Java's stack trace
+type CallTrace struct {
+	frames *runtime.Frames
+}
+
+// Trace returns a new CallTrace starting from this call
+// Use skip to skip the first entries in the trace
+func Trace(skip int) *CallTrace {
+	if !TraceCallStack {
+		return nil
+	}
+
+	pc := make([]uintptr, CallStackLength)
+	n := runtime.Callers(skip+1, pc)
+	pc = pc[:n]
+	return &CallTrace{runtime.CallersFrames(pc)}
+}
+
+func (ct *CallTrace) String() string {
+	if ct == nil {
+		return ""
+	}
+
+	b := new(strings.Builder)
+
+	for frame, ok := ct.frames.Next(); ok; frame, ok = ct.frames.Next() {
+		b.WriteString("\tat ")
+		b.WriteString(frame.Function)
+		b.WriteString(" (")
+		b.WriteString(frame.File)
+		b.WriteString(":")
+		b.WriteString(strconv.Itoa(frame.Line))
+		b.WriteString(")")
+		b.WriteString("\n")
+	}
+
+	return b.String()
+}