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// 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)
// 6g 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()
}