github.com/powerman/golang-tools@v0.1.11-0.20220410185822-5ad214d8d803/go/callgraph/cha/testdata/iface.go (about)

     1  // +build ignore
     2  
     3  package main
     4  
     5  // Test of interface calls.  None of the concrete types are ever
     6  // instantiated or converted to interfaces.
     7  
     8  type I interface {
     9  	f()
    10  }
    11  
    12  type J interface {
    13  	f()
    14  	g()
    15  }
    16  
    17  type C int // implements I
    18  
    19  func (*C) f()
    20  
    21  type D int // implements I and J
    22  
    23  func (*D) f()
    24  func (*D) g()
    25  
    26  func one(i I, j J) {
    27  	i.f() // calls *C and *D
    28  }
    29  
    30  func two(i I, j J) {
    31  	j.f() // calls *D (but not *C, even though it defines method f)
    32  }
    33  
    34  func three(i I, j J) {
    35  	j.g() // calls *D
    36  }
    37  
    38  func four(i I, j J) {
    39  	Jf := J.f
    40  	if unknown {
    41  		Jf = nil // suppress SSA constant propagation
    42  	}
    43  	Jf(nil) // calls *D
    44  }
    45  
    46  func five(i I, j J) {
    47  	jf := j.f
    48  	if unknown {
    49  		jf = nil // suppress SSA constant propagation
    50  	}
    51  	jf() // calls *D
    52  }
    53  
    54  var unknown bool
    55  
    56  // WANT:
    57  // Dynamic calls
    58  //   (J).f$bound --> (*D).f
    59  //   (J).f$thunk --> (*D).f
    60  //   five --> (J).f$bound
    61  //   four --> (J).f$thunk
    62  //   one --> (*C).f
    63  //   one --> (*D).f
    64  //   three --> (*D).g
    65  //   two --> (*D).f