5 // This file is the input to TestObjValueLookup in source_test.go,
6 // which ensures that each occurrence of an ident defining or
7 // referring to a func, var or const object can be mapped to its
8 // corresponding SSA Value.
10 // For every reference to a var object, we use annotations in comments
11 // to denote both the expected SSA Value kind, and whether to expect
12 // its value (x) or its address (&x).
14 // For const and func objects, the results don't vary by reference and
15 // are always values not addresses, so no annotations are needed. The
16 // declaration is enough.
27 var globalVar int //@ ssa(globalVar,"&Global")
36 x int //@ ssa(x,"nil")
40 print(globalVar) //@ ssa(globalVar,"UnOp")
41 globalVar = 1 //@ ssa(globalVar,"Const")
43 var v0 int = 1 //@ ssa(v0,"Const") // simple local value spec
44 if v0 > 0 { //@ ssa(v0,"Const")
45 v0 = 2 //@ ssa(v0,"Const")
47 print(v0) //@ ssa(v0,"Phi")
49 // v1 is captured and thus implicitly address-taken.
50 var v1 int = 1 //@ ssa(v1,"Const")
51 v1 = 2 //@ ssa(v1,"Const")
52 fmt.Println(v1) //@ ssa(v1,"UnOp") // load
53 f := func(param int) { //@ ssa(f,"MakeClosure"), ssa(param,"Parameter")
54 if y := 1; y > 0 { //@ ssa(y,"Const")
55 print(v1, param) //@ ssa(v1,"UnOp") /*load*/, ssa(param,"Parameter")
57 param = 2 //@ ssa(param,"Const")
58 println(param) //@ ssa(param,"Const")
61 f(0) //@ ssa(f,"MakeClosure")
63 var v2 int //@ ssa(v2,"Const") // implicitly zero-initialized local value spec
64 print(v2) //@ ssa(v2,"Const")
66 m := make(map[string]int) //@ ssa(m,"MakeMap")
68 // Local value spec with multi-valued RHS:
69 var v3, v4 = m[""] //@ ssa(v3,"Extract"), ssa(v4,"Extract"), ssa(m,"MakeMap")
70 print(v3) //@ ssa(v3,"Extract")
71 print(v4) //@ ssa(v4,"Extract")
73 v3++ //@ ssa(v3,"BinOp") // assign with op
74 v3 += 2 //@ ssa(v3,"BinOp") // assign with op
76 v5, v6 := false, "" //@ ssa(v5,"Const"), ssa(v6,"Const") // defining assignment
77 print(v5) //@ ssa(v5,"Const")
78 print(v6) //@ ssa(v6,"Const")
80 var v7 S //@ ssa(v7,"&Alloc")
81 v7.x = 1 //@ ssa(v7,"&Alloc"), ssa(x,"&FieldAddr")
82 print(v7.x) //@ ssa(v7,"&Alloc"), ssa(x,"&FieldAddr")
84 var v8 [1]int //@ ssa(v8,"&Alloc")
85 v8[0] = 0 //@ ssa(v8,"&Alloc")
86 print(v8[:]) //@ ssa(v8,"&Alloc")
87 _ = v8[0] //@ ssa(v8,"&Alloc")
88 _ = v8[:][0] //@ ssa(v8,"&Alloc")
89 v8ptr := &v8 //@ ssa(v8ptr,"Alloc"), ssa(v8,"&Alloc")
90 _ = v8ptr[0] //@ ssa(v8ptr,"Alloc")
91 _ = *v8ptr //@ ssa(v8ptr,"Alloc")
93 v8a := make([]int, 1) //@ ssa(v8a,"Slice")
94 v8a[0] = 0 //@ ssa(v8a,"Slice")
95 print(v8a[:]) //@ ssa(v8a,"Slice")
97 v9 := S{} //@ ssa(v9,"&Alloc")
99 v10 := &v9 //@ ssa(v10,"Alloc"), ssa(v9,"&Alloc")
100 _ = v10 //@ ssa(v10,"Alloc")
102 var v11 *J = nil //@ ssa(v11,"Const")
103 v11.method() //@ ssa(v11,"Const")
105 var v12 J //@ ssa(v12,"&Alloc")
106 v12.method() //@ ssa(v12,"&Alloc") // implicitly address-taken
108 // NB, in the following, 'method' resolves to the *types.Func
109 // of (*J).method, so it doesn't help us locate the specific
110 // ssa.Values here: a bound-method closure and a promotion
112 _ = v11.method //@ ssa(v11,"Const")
113 _ = (*struct{ J }).method //@ ssa(J,"nil")
115 // These vars are not optimised away.
117 v13 := 0 //@ ssa(v13,"Const")
118 println(v13) //@ ssa(v13,"Const")
121 switch x := 1; x { //@ ssa(x,"Const")
122 case v0: //@ ssa(v0,"Phi")
125 for k, v := range m { //@ ssa(k,"Extract"), ssa(v,"Extract"), ssa(m,"MakeMap")
126 _ = k //@ ssa(k,"Extract")
127 v++ //@ ssa(v,"BinOp")
130 if y := 0; y > 1 { //@ ssa(y,"Const"), ssa(y,"Const")
133 var i interface{} //@ ssa(i,"Const") // nil interface
134 i = 1 //@ ssa(i,"MakeInterface")
135 switch i := i.(type) { //@ ssa(i,"MakeInterface"), ssa(i,"MakeInterface")
137 println(i) //@ ssa(i,"Extract")
140 ch := make(chan int) //@ ssa(ch,"MakeChan")
142 case x := <-ch: //@ ssa(x,"UnOp") /*receive*/, ssa(ch,"MakeChan")
143 _ = x //@ ssa(x,"UnOp")
146 // .Op is an inter-package FieldVal-selection.
147 var err os.PathError //@ ssa(err,"&Alloc")
148 _ = err.Op //@ ssa(err,"&Alloc"), ssa(Op,"&FieldAddr")
149 _ = &err.Op //@ ssa(err,"&Alloc"), ssa(Op,"&FieldAddr")
151 // Exercise corner-cases of lvalues vs rvalues.
152 // (Guessing IsAddr from the 'pointerness' won't cut it here.)
154 var n N //@ ssa(n,"Const")
155 n1 := n //@ ssa(n1,"Const"), ssa(n,"Const")
156 n2 := &n1 //@ ssa(n2,"Alloc"), ssa(n1,"&Alloc")
157 n3 := *n2 //@ ssa(n3,"UnOp"), ssa(n2,"Alloc")
158 n4 := **n3 //@ ssa(n4,"UnOp"), ssa(n3,"UnOp")
159 _ = n4 //@ ssa(n4,"UnOp")