example1

Documentation

Index

• Variables
• type PathInfo
  • func NewValidCase(name string) *PathInfo
  • func NewWrongCase(name string) *PathInfo

Variables

var ValidCase = NewValidCase("example1")

ValidCase uses NewValidCase — the stable approach. Expected: this package's absolute path. ValidCase 使用 NewValidCase——稳定的方案。预期：本包的绝对路径。

var WrongCase = NewWrongCase("example1")

WrongCase uses NewWrongCase — demonstrates the shallow-stack issue. Expected: NOT this package's path (wrong due to the extra method frame). WrongCase 使用 NewWrongCase——演示浅栈问题。 预期：不是本包的路径（因为方法调用多占一帧导致结果错误）。

Types

type PathInfo

type PathInfo struct {
	Path string
	Name string
}

PathInfo simulates a cross-package struct that wraps path info. This replicates the scenario where a shared package defines a struct and a function, and consuming packages use it via package init variables.

PathInfo 模拟跨包使用的路径信息结构体。 复刻实际场景：一个公共包定义结构体和工厂函数，其他包通过包级变量调用。

func NewValidCase

func NewValidCase(name string) *PathInfo

NewValidCase creates PathInfo using filepath.Dir(locate.Skip(1)). This is a package function (not a method), and locate.Skip is also a package function. The invocation depth is: invocation site -> NewValidCase -> locate.Skip -> runtime.Caller. With locate.Skip(1), runtime.Caller(1+1=2) skips exact 2 frames to reach the invocation site. STABLE.

NewValidCase 使用 filepath.Dir(locate.Skip(1)) 创建 PathInfo。 这是包级函数（不是方法），locate.Skip 也是包级函数。 调用深度：调用方 -> NewValidCase -> locate.Skip -> runtime.Caller。 locate.Skip(1) 时 runtime.Caller(2) 恰好跳过 2 帧到达调用方。稳定可靠。

func NewWrongCase

func NewWrongCase(name string) *PathInfo

NewWrongCase creates PathInfo using locate.PARENT.Skip(1). locate.PARENT.Skip is a METHOD on parentNamespace, which itself is one stack frame. The invocation depth is: invocation site -> NewWrongCase -> PARENT.Skip -> Skip -> runtime.Caller. With PARENT.Skip(1), runtime.Caller(1+1+1=3) overshoots in package variable init's shallow stacks. This is the exact same issue that runpath.PARENT.Skip(1) had before mustAbsPath was added.

NewWrongCase 使用 locate.PARENT.Skip(1) 创建 PathInfo。 locate.PARENT.Skip 是 parentNamespace 上的方法，方法调用本身占一帧。 调用深度：调用方 -> NewWrongCase -> PARENT.Skip -> Skip -> runtime.Caller。 PARENT.Skip(1) 时 runtime.Caller(1+1+1=3) 在包级变量初始化的浅栈中跳过头了。 这与添加 mustAbsPath 之前的 runpath.PARENT.Skip(1) 问题完全一致。