tlog.app/go/tlog@v0.23.1/low/runtime.go (about)

     1  package low
     2  
     3  import "unsafe"
     4  
     5  type (
     6  	eface struct {
     7  		t unsafe.Pointer
     8  		p unsafe.Pointer
     9  	}
    10  
    11  	sh struct {
    12  		p unsafe.Pointer
    13  		l int
    14  	}
    15  )
    16  
    17  func UnpackInterface(v interface{}) (t, p unsafe.Pointer) {
    18  	e := ((*eface)(unsafe.Pointer(&v)))
    19  	return e.t, e.p
    20  }
    21  
    22  func InterfaceType(v interface{}) unsafe.Pointer {
    23  	return ((*eface)(unsafe.Pointer(&v))).t
    24  }
    25  
    26  func InterfaceData(v interface{}) unsafe.Pointer {
    27  	return ((*eface)(unsafe.Pointer(&v))).p
    28  }
    29  
    30  func UnsafeString(ptr unsafe.Pointer, l int) string {
    31  	return *(*string)(unsafe.Pointer(&sh{p: ptr, l: l}))
    32  }
    33  
    34  func UnsafeBytesToString(b []byte) string {
    35  	return *(*string)(unsafe.Pointer(&b))
    36  }
    37  
    38  func NoEscapeBuffer(b []byte) []byte {
    39  	return *(*[]byte)(noescape(unsafe.Pointer(&b)))
    40  }
    41  
    42  // noescape hides a pointer from escape analysis.  noescape is
    43  // the identity function but escape analysis doesn't think the
    44  // output depends on the input.  noescape is inlined and currently
    45  // compiles down to zero instructions.
    46  // USE CAREFULLY!
    47  //
    48  //go:nosplit
    49  func noescape(p unsafe.Pointer) unsafe.Pointer {
    50  	x := uintptr(p)
    51  	return unsafe.Pointer(x ^ 0) //nolint:staticcheck
    52  }