runtime: show stacktrace when panic

internal/runtime/z_rt.go

@@ -20,6 +20,7 @@ import (
 	"unsafe"
 
 	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/c/debug"
 	"github.com/goplus/llgo/c/pthread"
 	"github.com/goplus/llgo/c/signal"
 	"github.com/goplus/llgo/c/syscall"
@@ -61,6 +62,13 @@ func Rethrow(link *Defer) {
 	if ptr := excepKey.Get(); ptr != nil {
 		if link == nil {
 			TracePanic(*(*any)(ptr))
+			debug.StackTrace(0, func(fr *debug.Frame) bool {
+				var info debug.Info
+				debug.Addrinfo(unsafe.Pointer(fr.PC), &info)
+				c.Fprintf(c.Stderr, c.Str("[0x%08X %s+0x%x, SP = 0x%x]\n"), fr.PC, fr.Name, fr.Offset, fr.SP)
+				return true
+			})
+
 			c.Free(ptr)
 			c.Exit(2)
 		} else {