github.com/llvm-mirror/llgo@v0.0.0-20190322182713-bf6f0a60fce1/third_party/gotools/go/pointer/testdata/maps.go (about)

     1  // +build ignore
     2  
     3  package main
     4  
     5  // Test of maps.
     6  
     7  var a, b, c int
     8  
     9  func maps1() {
    10  	m1 := map[*int]*int{&a: &b} // @line m1m1
    11  	m2 := make(map[*int]*int)   // @line m1m2
    12  	m2[&b] = &a
    13  
    14  	print(m1[nil]) // @pointsto main.b | main.c
    15  	print(m2[nil]) // @pointsto main.a
    16  
    17  	print(m1) // @pointsto makemap@m1m1:21
    18  	print(m2) // @pointsto makemap@m1m2:12
    19  
    20  	m1[&b] = &c
    21  
    22  	for k, v := range m1 {
    23  		print(k) // @pointsto main.a | main.b
    24  		print(v) // @pointsto main.b | main.c
    25  	}
    26  
    27  	for k, v := range m2 {
    28  		print(k) // @pointsto main.b
    29  		print(v) // @pointsto main.a
    30  	}
    31  
    32  	// Lookup doesn't create any aliases.
    33  	print(m2[&c]) // @pointsto main.a
    34  	if _, ok := m2[&a]; ok {
    35  		print(m2[&c]) // @pointsto main.a
    36  	}
    37  }
    38  
    39  func maps2() {
    40  	m1 := map[*int]*int{&a: &b}
    41  	m2 := map[*int]*int{&b: &c}
    42  	_ = []map[*int]*int{m1, m2} // (no spurious merging of m1, m2)
    43  
    44  	print(m1[nil]) // @pointsto main.b
    45  	print(m2[nil]) // @pointsto main.c
    46  }
    47  
    48  func main() {
    49  	maps1()
    50  	maps2()
    51  }