object_test.go

     1  // Copyright 2016 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package types2_test
     6  
     7  import (
     8  	"internal/testenv"
     9  	"strings"
    10  	"testing"
    11  
    12  	. "cmd/compile/internal/types2"
    13  )
    14  
    15  func TestIsAlias(t *testing.T) {
    16  	check := func(obj *TypeName, want bool) {
    17  		if got := obj.IsAlias(); got != want {
    18  			t.Errorf("%v: got IsAlias = %v; want %v", obj, got, want)
    19  		}
    20  	}
    21  
    22  	// predeclared types
    23  	check(Unsafe.Scope().Lookup("Pointer").(*TypeName), false)
    24  	for _, name := range Universe.Names() {
    25  		if obj, _ := Universe.Lookup(name).(*TypeName); obj != nil {
    26  			check(obj, name == "any" || name == "byte" || name == "rune")
    27  		}
    28  	}
    29  
    30  	// various other types
    31  	pkg := NewPackage("p", "p")
    32  	t1 := NewTypeName(nopos, pkg, "t1", nil)
    33  	n1 := NewNamed(t1, new(Struct), nil)
    34  	t5 := NewTypeName(nopos, pkg, "t5", nil)
    35  	NewTypeParam(t5, nil)
    36  	for _, test := range []struct {
    37  		name  *TypeName
    38  		alias bool
    39  	}{
    40  		{NewTypeName(nopos, nil, "t0", nil), false}, // no type yet
    41  		{NewTypeName(nopos, pkg, "t0", nil), false}, // no type yet
    42  		{t1, false}, // type name refers to named type and vice versa
    43  		{NewTypeName(nopos, nil, "t2", NewInterfaceType(nil, nil)), true}, // type name refers to unnamed type
    44  		{NewTypeName(nopos, pkg, "t3", n1), true},                         // type name refers to named type with different type name
    45  		{NewTypeName(nopos, nil, "t4", Typ[Int32]), true},                 // type name refers to basic type with different name
    46  		{NewTypeName(nopos, nil, "int32", Typ[Int32]), false},             // type name refers to basic type with same name
    47  		{NewTypeName(nopos, pkg, "int32", Typ[Int32]), true},              // type name is declared in user-defined package (outside Universe)
    48  		{NewTypeName(nopos, nil, "rune", Typ[Rune]), true},                // type name refers to basic type rune which is an alias already
    49  		{t5, false}, // type name refers to type parameter and vice versa
    50  	} {
    51  		check(test.name, test.alias)
    52  	}
    53  }
    54  
    55  // TestEmbeddedMethod checks that an embedded method is represented by
    56  // the same Func Object as the original method. See also go.dev/issue/34421.
    57  func TestEmbeddedMethod(t *testing.T) {
    58  	const src = `package p; type I interface { error }`
    59  	pkg := mustTypecheck(src, nil, nil)
    60  
    61  	// get original error.Error method
    62  	eface := Universe.Lookup("error")
    63  	orig, _, _ := LookupFieldOrMethod(eface.Type(), false, nil, "Error")
    64  	if orig == nil {
    65  		t.Fatalf("original error.Error not found")
    66  	}
    67  
    68  	// get embedded error.Error method
    69  	iface := pkg.Scope().Lookup("I")
    70  	embed, _, _ := LookupFieldOrMethod(iface.Type(), false, nil, "Error")
    71  	if embed == nil {
    72  		t.Fatalf("embedded error.Error not found")
    73  	}
    74  
    75  	// original and embedded Error object should be identical
    76  	if orig != embed {
    77  		t.Fatalf("%s (%p) != %s (%p)", orig, orig, embed, embed)
    78  	}
    79  }
    80  
    81  var testObjects = []struct {
    82  	src  string
    83  	obj  string
    84  	want string
    85  }{
    86  	{"import \"io\"; var r io.Reader", "r", "var p.r io.Reader"},
    87  
    88  	{"const c = 1.2", "c", "const p.c untyped float"},
    89  	{"const c float64 = 3.14", "c", "const p.c float64"},
    90  
    91  	{"type t struct{f int}", "t", "type p.t struct{f int}"},
    92  	{"type t func(int)", "t", "type p.t func(int)"},
    93  	{"type t[P any] struct{f P}", "t", "type p.t[P any] struct{f P}"},
    94  	{"type t[P any] struct{f P}", "t.P", "type parameter P any"},
    95  	{"type C interface{m()}; type t[P C] struct{}", "t.P", "type parameter P p.C"},
    96  
    97  	{"type t = struct{f int}", "t", "type p.t = struct{f int}"},
    98  	{"type t = func(int)", "t", "type p.t = func(int)"},
    99  
   100  	{"var v int", "v", "var p.v int"},
   101  
   102  	{"func f(int) string", "f", "func p.f(int) string"},
   103  	{"func g[P any](x P){}", "g", "func p.g[P any](x P)"},
   104  	{"func g[P interface{~int}](x P){}", "g.P", "type parameter P interface{~int}"},
   105  	{"", "any", "type any = interface{}"},
   106  }
   107  
   108  func TestObjectString(t *testing.T) {
   109  	testenv.MustHaveGoBuild(t)
   110  
   111  	for _, test := range testObjects {
   112  		src := "package p; " + test.src
   113  		pkg, err := typecheck(src, nil, nil)
   114  		if err != nil {
   115  			t.Errorf("%s: %s", src, err)
   116  			continue
   117  		}
   118  
   119  		names := strings.Split(test.obj, ".")
   120  		if len(names) != 1 && len(names) != 2 {
   121  			t.Errorf("%s: invalid object path %s", test.src, test.obj)
   122  			continue
   123  		}
   124  		_, obj := pkg.Scope().LookupParent(names[0], nopos)
   125  		if obj == nil {
   126  			t.Errorf("%s: %s not found", test.src, names[0])
   127  			continue
   128  		}
   129  		if len(names) == 2 {
   130  			if typ, ok := obj.Type().(interface{ TypeParams() *TypeParamList }); ok {
   131  				obj = lookupTypeParamObj(typ.TypeParams(), names[1])
   132  				if obj == nil {
   133  					t.Errorf("%s: %s not found", test.src, test.obj)
   134  					continue
   135  				}
   136  			} else {
   137  				t.Errorf("%s: %s has no type parameters", test.src, names[0])
   138  				continue
   139  			}
   140  		}
   141  
   142  		if got := obj.String(); got != test.want {
   143  			t.Errorf("%s: got %s, want %s", test.src, got, test.want)
   144  		}
   145  	}
   146  }
   147  
   148  func lookupTypeParamObj(list *TypeParamList, name string) Object {
   149  	for i := 0; i < list.Len(); i++ {
   150  		tpar := list.At(i)
   151  		if tpar.Obj().Name() == name {
   152  			return tpar.Obj()
   153  		}
   154  	}
   155  	return nil
   156  }
   157
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