Initial commit: Go 1.23 release state

test/cmp.go

@@ -0,0 +1,488 @@
+// run
+
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Test equality and inequality operations.
+
+package main
+
+import (
+	"os"
+	"unsafe"
+)
+
+var global bool
+
+func use(b bool) { global = b }
+
+func stringptr(s string) uintptr { return *(*uintptr)(unsafe.Pointer(&s)) }
+
+func isfalse(b bool) {
+	if b {
+		// stack will explain where
+		panic("wanted false, got true")
+	}
+}
+
+func istrue(b bool) {
+	if !b {
+		// stack will explain where
+		panic("wanted true, got false")
+	}
+}
+
+type T *int
+
+type X int
+
+func (X) x() {}
+
+func main() {
+	var a []int
+	var b map[string]int
+
+	var c string = "hello"
+	var d string = "hel" // try to get different pointer
+	d = d + "lo"
+
+	// go.tools/ssa/interp can't handle unsafe.Pointer.
+	if os.Getenv("GOSSAINTERP") == "" {
+		if stringptr(c) == stringptr(d) {
+			panic("compiler too smart -- got same string")
+		}
+	}
+
+	var e = make(chan int)
+
+	var ia interface{} = a
+	var ib interface{} = b
+	var ic interface{} = c
+	var id interface{} = d
+	var ie interface{} = e
+
+	// these comparisons are okay because
+	// string compare is okay and the others
+	// are comparisons where the types differ.
+	isfalse(ia == ib)
+	isfalse(ia == ic)
+	isfalse(ia == id)
+	isfalse(ib == ic)
+	isfalse(ib == id)
+	istrue(ic == id)
+	istrue(ie == ie)
+
+	istrue(ia != ib)
+	istrue(ia != ic)
+	istrue(ia != id)
+	istrue(ib != ic)
+	istrue(ib != id)
+	isfalse(ic != id)
+	isfalse(ie != ie)
+
+	// these are not okay, because there is no comparison on slices or maps.
+	//isfalse(a == ib)
+	//isfalse(a == ic)
+	//isfalse(a == id)
+	//isfalse(b == ic)
+	//isfalse(b == id)
+
+	istrue(c == id)
+	istrue(e == ie)
+
+	//isfalse(ia == b)
+	isfalse(ia == c)
+	isfalse(ia == d)
+	isfalse(ib == c)
+	isfalse(ib == d)
+	istrue(ic == d)
+	istrue(ie == e)
+
+	//istrue(a != ib)
+	//istrue(a != ic)
+	//istrue(a != id)
+	//istrue(b != ic)
+	//istrue(b != id)
+	isfalse(c != id)
+	isfalse(e != ie)
+
+	//istrue(ia != b)
+	istrue(ia != c)
+	istrue(ia != d)
+	istrue(ib != c)
+	istrue(ib != d)
+	isfalse(ic != d)
+	isfalse(ie != e)
+
+	// gc used to let this go through as true.
+	var g uint64 = 123
+	var h int64 = 123
+	var ig interface{} = g
+	var ih interface{} = h
+	isfalse(ig == ih)
+	istrue(ig != ih)
+
+	// map of interface should use == on interface values,
+	// not memory.
+	var m = make(map[interface{}]int)
+	m[ic] = 1
+	m[id] = 2
+	if m[c] != 2 {
+		println("m[c] = ", m[c])
+		panic("bad m[c]")
+	}
+
+	// interface comparisons (issue 7207)
+	{
+		type I1 interface {
+			x()
+		}
+		type I2 interface {
+			x()
+		}
+		a1 := I1(X(0))
+		b1 := I1(X(1))
+		a2 := I2(X(0))
+		b2 := I2(X(1))
+		a3 := I1(a2)
+		a4 := I2(a1)
+		var e interface{} = X(0)
+		a5 := e.(I1)
+		a6 := e.(I2)
+		isfalse(a1 == b1)
+		isfalse(a1 == b2)
+		isfalse(a2 == b1)
+		isfalse(a2 == b2)
+		istrue(a1 == a2)
+		istrue(a1 == a3)
+		istrue(a1 == a4)
+		istrue(a1 == a5)
+		istrue(a1 == a6)
+		istrue(a2 == a3)
+		istrue(a2 == a4)
+		istrue(a2 == a5)
+		istrue(a2 == a6)
+		istrue(a3 == a4)
+		istrue(a3 == a5)
+		istrue(a3 == a6)
+		istrue(a4 == a5)
+		istrue(a4 == a6)
+		istrue(a5 == a6)
+	}
+
+	// non-interface comparisons
+	{
+		c := make(chan int)
+		c1 := (<-chan int)(c)
+		c2 := (chan<- int)(c)
+		istrue(c == c1)
+		istrue(c == c2)
+		istrue(c1 == c)
+		istrue(c2 == c)
+
+		isfalse(c != c1)
+		isfalse(c != c2)
+		isfalse(c1 != c)
+		isfalse(c2 != c)
+
+		d := make(chan int)
+		isfalse(c == d)
+		isfalse(d == c)
+		isfalse(d == c1)
+		isfalse(d == c2)
+		isfalse(c1 == d)
+		isfalse(c2 == d)
+
+		istrue(c != d)
+		istrue(d != c)
+		istrue(d != c1)
+		istrue(d != c2)
+		istrue(c1 != d)
+		istrue(c2 != d)
+	}
+
+	// named types vs not
+	{
+		var x = new(int)
+		var y T
+		var z T = x
+
+		isfalse(x == y)
+		istrue(x == z)
+		isfalse(y == z)
+
+		isfalse(y == x)
+		istrue(z == x)
+		isfalse(z == y)
+
+		istrue(x != y)
+		isfalse(x != z)
+		istrue(y != z)
+
+		istrue(y != x)
+		isfalse(z != x)
+		istrue(z != y)
+	}
+
+	// structs
+	{
+		var x = struct {
+			x int
+			y string
+		}{1, "hi"}
+		var y = struct {
+			x int
+			y string
+		}{2, "bye"}
+		var z = struct {
+			x int
+			y string
+		}{1, "hi"}
+
+		isfalse(x == y)
+		isfalse(y == x)
+		isfalse(y == z)
+		isfalse(z == y)
+		istrue(x == z)
+		istrue(z == x)
+
+		istrue(x != y)
+		istrue(y != x)
+		istrue(y != z)
+		istrue(z != y)
+		isfalse(x != z)
+		isfalse(z != x)
+
+		var m = make(map[struct {
+			x int
+			y string
+		}]int)
+		m[x] = 10
+		m[y] = 20
+		m[z] = 30
+		istrue(m[x] == 30)
+		istrue(m[y] == 20)
+		istrue(m[z] == 30)
+		istrue(m[x] != 10)
+		isfalse(m[x] != 30)
+		isfalse(m[y] != 20)
+		isfalse(m[z] != 30)
+		isfalse(m[x] == 10)
+
+		var m1 = make(map[struct {
+			x int
+			y string
+		}]struct {
+			x int
+			y string
+		})
+		m1[x] = x
+		m1[y] = y
+		m1[z] = z
+		istrue(m1[x] == z)
+		istrue(m1[y] == y)
+		istrue(m1[z] == z)
+		istrue(m1[x] == x)
+		isfalse(m1[x] != z)
+		isfalse(m1[y] != y)
+		isfalse(m1[z] != z)
+		isfalse(m1[x] != x)
+
+		var ix, iy, iz interface{} = x, y, z
+
+		isfalse(ix == iy)
+		isfalse(iy == ix)
+		isfalse(iy == iz)
+		isfalse(iz == iy)
+		istrue(ix == iz)
+		istrue(iz == ix)
+
+		isfalse(x == iy)
+		isfalse(y == ix)
+		isfalse(y == iz)
+		isfalse(z == iy)
+		istrue(x == iz)
+		istrue(z == ix)
+
+		isfalse(ix == y)
+		isfalse(iy == x)
+		isfalse(iy == z)
+		isfalse(iz == y)
+		istrue(ix == z)
+		istrue(iz == x)
+
+		istrue(ix != iy)
+		istrue(iy != ix)
+		istrue(iy != iz)
+		istrue(iz != iy)
+		isfalse(ix != iz)
+		isfalse(iz != ix)
+
+		istrue(x != iy)
+		istrue(y != ix)
+		istrue(y != iz)
+		istrue(z != iy)
+		isfalse(x != iz)
+		isfalse(z != ix)
+
+		istrue(ix != y)
+		istrue(iy != x)
+		istrue(iy != z)
+		istrue(iz != y)
+		isfalse(ix != z)
+		isfalse(iz != x)
+	}
+
+	// structs with _ fields
+	{
+		var x = struct {
+			x int
+			_ string
+			y float64
+			_ float64
+			z int
+		}{
+			x: 1, y: 2, z: 3,
+		}
+		var ix interface{} = x
+
+		istrue(x == x)
+		istrue(x == ix)
+		istrue(ix == x)
+		istrue(ix == ix)
+	}
+
+	// arrays
+	{
+		var x = [2]string{"1", "hi"}
+		var y = [2]string{"2", "bye"}
+		var z = [2]string{"1", "hi"}
+
+		isfalse(x == y)
+		isfalse(y == x)
+		isfalse(y == z)
+		isfalse(z == y)
+		istrue(x == z)
+		istrue(z == x)
+
+		istrue(x != y)
+		istrue(y != x)
+		istrue(y != z)
+		istrue(z != y)
+		isfalse(x != z)
+		isfalse(z != x)
+
+		var m = make(map[[2]string]int)
+		m[x] = 10
+		m[y] = 20
+		m[z] = 30
+		istrue(m[x] == 30)
+		istrue(m[y] == 20)
+		istrue(m[z] == 30)
+		isfalse(m[x] != 30)
+		isfalse(m[y] != 20)
+		isfalse(m[z] != 30)
+
+		var ix, iy, iz interface{} = x, y, z
+
+		isfalse(ix == iy)
+		isfalse(iy == ix)
+		isfalse(iy == iz)
+		isfalse(iz == iy)
+		istrue(ix == iz)
+		istrue(iz == ix)
+
+		isfalse(x == iy)
+		isfalse(y == ix)
+		isfalse(y == iz)
+		isfalse(z == iy)
+		istrue(x == iz)
+		istrue(z == ix)
+
+		isfalse(ix == y)
+		isfalse(iy == x)
+		isfalse(iy == z)
+		isfalse(iz == y)
+		istrue(ix == z)
+		istrue(iz == x)
+
+		istrue(ix != iy)
+		istrue(iy != ix)
+		istrue(iy != iz)
+		istrue(iz != iy)
+		isfalse(ix != iz)
+		isfalse(iz != ix)
+
+		istrue(x != iy)
+		istrue(y != ix)
+		istrue(y != iz)
+		istrue(z != iy)
+		isfalse(x != iz)
+		isfalse(z != ix)
+
+		istrue(ix != y)
+		istrue(iy != x)
+		istrue(iy != z)
+		istrue(iz != y)
+		isfalse(ix != z)
+		isfalse(iz != x)
+	}
+
+	// named booleans
+	{
+		type mybool bool
+		var b mybool
+
+		type T struct{ data [20]byte }
+		var x, y T
+		b = x == y
+		istrue(x == y)
+		istrue(bool(b))
+
+		m := make(map[string][10]interface{})
+		b = m["x"] == m["y"]
+		istrue(m["x"] == m["y"])
+		istrue(bool(b))
+	}
+
+	shouldPanic(p1)
+	shouldPanic(p2)
+	shouldPanic(p3)
+	shouldPanic(p4)
+}
+
+func p1() {
+	var a []int
+	var ia interface{} = a
+	use(ia == ia)
+}
+
+func p2() {
+	var b []int
+	var ib interface{} = b
+	use(ib == ib)
+}
+
+func p3() {
+	var a []int
+	var ia interface{} = a
+	var m = make(map[interface{}]int)
+	m[ia] = 1
+}
+
+func p4() {
+	var b []int
+	var ib interface{} = b
+	var m = make(map[interface{}]int)
+	m[ib] = 1
+}
+
+func shouldPanic(f func()) {
+	defer func() {
+		if recover() == nil {
+			panic("function should panic")
+		}
+	}()
+	f()
+}