github.com/phuslu/log@v1.0.100/runtime.go (about)

     1  package log
     2  
     3  import (
     4  	"unsafe"
     5  )
     6  
     7  type funcInfo struct {
     8  	_func unsafe.Pointer
     9  	datap unsafe.Pointer //nolint:unused
    10  }
    11  
    12  //go:linkname findfunc runtime.findfunc
    13  func findfunc(pc uintptr) funcInfo
    14  
    15  //go:linkname funcInfoEntry runtime.funcInfo.entry
    16  func funcInfoEntry(f funcInfo) uintptr
    17  
    18  //go:linkname funcline1 runtime.funcline1
    19  func funcline1(f funcInfo, targetpc uintptr, strict bool) (file string, line int32)
    20  
    21  func pcFileLine(pc uintptr) (file string, line int32) {
    22  	funcInfo := findfunc(pc)
    23  	if funcInfo._func == nil {
    24  		return
    25  	}
    26  
    27  	entry := funcInfoEntry(funcInfo)
    28  
    29  	if pc > entry {
    30  		// We store the pc of the start of the instruction following
    31  		// the instruction in question (the call or the inline mark).
    32  		// This is done for historical reasons, and to make FuncForPC
    33  		// work correctly for entries in the result of runtime.Callers.
    34  		pc--
    35  	}
    36  
    37  	return funcline1(funcInfo, pc, false)
    38  }