--- /dev/null
+//+build ignore
+
+package main
+
+// This file is the input to TestObjValueLookup in source_test.go,
+// which ensures that each occurrence of an ident defining or
+// referring to a func, var or const object can be mapped to its
+// corresponding IR Value.
+//
+// For every reference to a var object, we use annotations in comments
+// to denote both the expected IR Value kind, and whether to expect
+// its value (x) or its address (&x).
+//
+// For const and func objects, the results don't vary by reference and
+// are always values not addresses, so no annotations are needed. The
+// declaration is enough.
+
+import (
+ "fmt"
+ "os"
+)
+
+type J int
+
+func (*J) method() {}
+
+const globalConst = 0
+
+var globalVar int //@ ir(globalVar,"&Global")
+
+func globalFunc() {}
+
+type I interface {
+ interfaceMethod()
+}
+
+type S struct {
+ x int //@ ir(x,"nil")
+}
+
+func main() {
+ print(globalVar) //@ ir(globalVar,"Load")
+ globalVar = 1 //@ ir(globalVar,"Const")
+
+ var v0 int = 1 //@ ir(v0,"Const") // simple local value spec
+ if v0 > 0 { //@ ir(v0,"Const")
+ v0 = 2 //@ ir(v0,"Const")
+ }
+ print(v0) //@ ir(v0,"Phi")
+
+ // v1 is captured and thus implicitly address-taken.
+ var v1 int = 1 //@ ir(v1,"Const")
+ v1 = 2 //@ ir(v1,"Const")
+ fmt.Println(v1) //@ ir(v1,"Load") // load
+ f := func(param int) { //@ ir(f,"MakeClosure"), ir(param,"Parameter")
+ if y := 1; y > 0 { //@ ir(y,"Const")
+ print(v1, param) //@ ir(v1,"Load") /*load*/, ir(param,"Sigma")
+ }
+ param = 2 //@ ir(param,"Const")
+ println(param) //@ ir(param,"Const")
+ }
+
+ f(0) //@ ir(f,"MakeClosure")
+
+ var v2 int //@ ir(v2,"Const") // implicitly zero-initialized local value spec
+ print(v2) //@ ir(v2,"Const")
+
+ m := make(map[string]int) //@ ir(m,"MakeMap")
+
+ // Local value spec with multi-valued RHS:
+ var v3, v4 = m[""] //@ ir(v3,"Extract"), ir(v4,"Extract"), ir(m,"MakeMap")
+ print(v3) //@ ir(v3,"Extract")
+ print(v4) //@ ir(v4,"Extract")
+
+ v3++ //@ ir(v3,"BinOp") // assign with op
+ v3 += 2 //@ ir(v3,"BinOp") // assign with op
+
+ v5, v6 := false, "" //@ ir(v5,"Const"), ir(v6,"Const") // defining assignment
+ print(v5) //@ ir(v5,"Const")
+ print(v6) //@ ir(v6,"Const")
+
+ var v7 S //@ ir(v7,"&Alloc")
+ v7.x = 1 //@ ir(v7,"&Alloc"), ir(x,"&FieldAddr")
+ print(v7.x) //@ ir(v7,"&Alloc"), ir(x,"&FieldAddr")
+
+ var v8 [1]int //@ ir(v8,"&Alloc")
+ v8[0] = 0 //@ ir(v8,"&Alloc")
+ print(v8[:]) //@ ir(v8,"&Alloc")
+ _ = v8[0] //@ ir(v8,"&Alloc")
+ _ = v8[:][0] //@ ir(v8,"&Alloc")
+ v8ptr := &v8 //@ ir(v8ptr,"Alloc"), ir(v8,"&Alloc")
+ _ = v8ptr[0] //@ ir(v8ptr,"Alloc")
+ _ = *v8ptr //@ ir(v8ptr,"Alloc")
+
+ v8a := make([]int, 1) //@ ir(v8a,"Slice")
+ v8a[0] = 0 //@ ir(v8a,"Slice")
+ print(v8a[:]) //@ ir(v8a,"Slice")
+
+ v9 := S{} //@ ir(v9,"&Alloc")
+
+ v10 := &v9 //@ ir(v10,"Alloc"), ir(v9,"&Alloc")
+ _ = v10 //@ ir(v10,"Alloc")
+
+ var v11 *J = nil //@ ir(v11,"Const")
+ v11.method() //@ ir(v11,"Const")
+
+ var v12 J //@ ir(v12,"&Alloc")
+ v12.method() //@ ir(v12,"&Alloc") // implicitly address-taken
+
+ // NB, in the following, 'method' resolves to the *types.Func
+ // of (*J).method, so it doesn't help us locate the specific
+ // ir.Values here: a bound-method closure and a promotion
+ // wrapper.
+ _ = v11.method //@ ir(v11,"Const")
+ _ = (*struct{ J }).method //@ ir(J,"nil")
+
+ // These vars are not optimised away.
+ if false {
+ v13 := 0 //@ ir(v13,"Const")
+ println(v13) //@ ir(v13,"Const")
+ }
+
+ switch x := 1; x { //@ ir(x,"Const")
+ case v0: //@ ir(v0,"Phi")
+ }
+
+ for k, v := range m { //@ ir(k,"Extract"), ir(v,"Extract"), ir(m,"MakeMap")
+ _ = k //@ ir(k,"Extract")
+ v++ //@ ir(v,"BinOp")
+ }
+
+ if y := 0; y > 1 { //@ ir(y,"Const"), ir(y,"Const")
+ }
+
+ var i interface{} //@ ir(i,"Const") // nil interface
+ i = 1 //@ ir(i,"MakeInterface")
+ switch i := i.(type) { //@ ir(i,"MakeInterface"), ir(i,"MakeInterface")
+ case int:
+ println(i) //@ ir(i,"Extract")
+ }
+
+ ch := make(chan int) //@ ir(ch,"MakeChan")
+ select {
+ case x := <-ch: //@ ir(x,"Recv") /*receive*/, ir(ch,"MakeChan")
+ _ = x //@ ir(x,"Recv")
+ }
+
+ // .Op is an inter-package FieldVal-selection.
+ var err os.PathError //@ ir(err,"&Alloc")
+ _ = err.Op //@ ir(err,"&Alloc"), ir(Op,"&FieldAddr")
+ _ = &err.Op //@ ir(err,"&Alloc"), ir(Op,"&FieldAddr")
+
+ // Exercise corner-cases of lvalues vs rvalues.
+ // (Guessing IsAddr from the 'pointerness' won't cut it here.)
+ type N *N
+ var n N //@ ir(n,"Const")
+ n1 := n //@ ir(n1,"Const"), ir(n,"Const")
+ n2 := &n1 //@ ir(n2,"Alloc"), ir(n1,"&Alloc")
+ n3 := *n2 //@ ir(n3,"Load"), ir(n2,"Alloc")
+ n4 := **n3 //@ ir(n4,"Load"), ir(n3,"Load")
+ _ = n4 //@ ir(n4,"Load")
+}
projects / dotfiles / .git / blobdiff