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-rw-r--r--test/cmp.go488
1 files changed, 488 insertions, 0 deletions
diff --git a/test/cmp.go b/test/cmp.go
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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)
+
+ // 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()
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-12 16:52:07 +0000