Go panic recover

// 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 存储当前要执行的defer的函数参数地址
	argp      unsafe.Pointer // pointer to arguments of deferred call run during panic; cannot move - known to liblink
	// arg panic函数自己的参数
    arg       interface{}    // argument to panic
    // link，链到之前发生的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 标识panic是否被恢复
    recovered bool           // whether this panic is over
    // aborted 标识panic是否被终止
	aborted   bool           // the panic was aborted
	goexit    bool
}