go/src/runtime/extern.go

// Caller reports file and line number information about function invocations on
// the calling goroutine's stack. The argument skip is the number of stack frames
// to ascend, with 0 identifying the caller of Caller. (For historical reasons the
// meaning of skip differs between Caller and [Callers].) The return values report
// the program counter, the file name (using forward slashes as path separator, even
// on Windows), and the line number within the file of the corresponding call.
// The boolean ok is false if it was not possible to recover the information.
func Caller(skip int) (pc uintptr, file string, line int, ok bool) { … }

// Callers fills the slice pc with the return program counters of function invocations
// on the calling goroutine's stack. The argument skip is the number of stack frames
// to skip before recording in pc, with 0 identifying the frame for Callers itself and
// 1 identifying the caller of Callers.
// It returns the number of entries written to pc.
//
// To translate these PCs into symbolic information such as function
// names and line numbers, use [CallersFrames]. CallersFrames accounts
// for inlined functions and adjusts the return program counters into
// call program counters. Iterating over the returned slice of PCs
// directly is discouraged, as is using [FuncForPC] on any of the
// returned PCs, since these cannot account for inlining or return
// program counter adjustment.
func Callers(skip int, pc []uintptr) int { … }

var defaultGOROOT …

// GOROOT returns the root of the Go tree. It uses the
// GOROOT environment variable, if set at process start,
// or else the root used during the Go build.
//
// Deprecated: The root used during the Go build will not be
// meaningful if the binary is copied to another machine.
// Use the system path to locate the “go” binary, and use
// “go env GOROOT” to find its GOROOT.
func GOROOT() string { … }

var buildVersion …

// Version returns the Go tree's version string.
// It is either the commit hash and date at the time of the build or,
// when possible, a release tag like "go1.3".
func Version() string { … }

const GOOS …

const GOARCH …