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深入理解 Go | panic 和 recover
source link: https://ictar.github.io/2020/04/01/dive-into-go-panic-recover/
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深入理解 Go | panic 和 recover
golang 中使用了以下两个内置函数来处理错误和恢复：
func panic(v interface{})： * 一旦调用： * 立刻停止执行函数其他代码 * 执行结束后，在当前 Goroutine 中递归执行调用方的延迟函数调用 defer * 允许在 defer 中嵌套多次调用
func recover() interface{}： * 用于中止 panic 造成的程序崩溃 * 只能在 defer 中发挥作用（只有在 panic 之后调用才生效）
基于 Go 1.14
panic 关键字在 golang 中由数据结构 runtime._panic 表示：
// A _panic holds information about an active panic.
//
// This is marked go:notinheap because _panic values 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.
//
//go:notinheap
type _panic struct {
argp unsafe.Pointer // 指向 panic 期间运行的 defer 调用的参数
arg interface{} // 调用 panic 时传入的参数
link *_panic // 指向更早调用的 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 bool // 表示当前这个 panic 是否被 recover 恢复
aborted bool // 表示当前这个 panic 是否被强行终止
goexit bool // 当调用了 runtime.Goexit()，就会将该值修改为 true
}
请言小午吃个甜筒~~
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