// A _panic holds information about an active panic.
//
// A _panic value must only ever live on the stack.
//
// The argp and link fields are stack pointers, but don't need special
// handling during stack growth: because they are pointer-typed and
// _panic values only live on the stack, regular stack pointer
// adjustment takes care of them.
type _panic struct {
    // argp 存儲當前要執行的defer的函數參數地址
	argp      unsafe.Pointer // pointer to arguments of deferred call run during panic; cannot move - known to liblink
	// arg panic函數自己的參數
    arg       interface{}    // argument to panic
    // link，鏈到之前發生的panic
	link      *_panic        // link to earlier panic
	pc        uintptr        // where to return to in runtime if this panic is bypassed
	sp        unsafe.Pointer // where to return to in runtime if this panic is bypassed
	// recovered 標識panic是否被恢復
    recovered bool           // whether this panic is over
    // aborted 標識panic是否被終止
	aborted   bool           // the panic was aborted
	goexit    bool
}