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// run
// Copyright 2010 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 that zero division causes a panic.
package main
import (
"fmt"
"math"
"runtime"
"strings"
)
type ErrorTest struct {
name string
fn func()
err string
}
var (
i, j, k int = 0, 0, 1
i8, j8, k8 int8 = 0, 0, 1
i16, j16, k16 int16 = 0, 0, 1
i32, j32, k32 int32 = 0, 0, 1
i64, j64, k64 int64 = 0, 0, 1
bb = []int16{2, 0}
u, v, w uint = 0, 0, 1
u8, v8, w8 uint8 = 0, 0, 1
u16, v16, w16 uint16 = 0, 0, 1
u32, v32, w32 uint32 = 0, 0, 1
u64, v64, w64 uint64 = 0, 0, 1
up, vp, wp uintptr = 0, 0, 1
f, g, h float64 = 0, 0, 1
f32, g32, h32 float32 = 0, 0, 1
f64, g64, h64, inf, negInf, nan float64 = 0, 0, 1, math.Inf(1), math.Inf(-1), math.NaN()
c, d, e complex128 = 0 + 0i, 0 + 0i, 1 + 1i
c64, d64, e64 complex64 = 0 + 0i, 0 + 0i, 1 + 1i
c128, d128, e128 complex128 = 0 + 0i, 0 + 0i, 1 + 1i
)
// Fool gccgo into thinking that these variables can change.
func NotCalled() {
i++
j++
k++
i8++
j8++
k8++
i16++
j16++
k16++
i32++
j32++
k32++
i64++
j64++
k64++
u++
v++
w++
u8++
v8++
w8++
u16++
v16++
w16++
u32++
v32++
w32++
u64++
v64++
w64++
up++
vp++
wp++
f += 1
g += 1
h += 1
f32 += 1
g32 += 1
h32 += 1
f64 += 1
g64 += 1
h64 += 1
c += 1 + 1i
d += 1 + 1i
e += 1 + 1i
c64 += 1 + 1i
d64 += 1 + 1i
e64 += 1 + 1i
c128 += 1 + 1i
d128 += 1 + 1i
e128 += 1 + 1i
}
var tmp interface{}
// We could assign to _ but the compiler optimizes it too easily.
func use(v interface{}) {
tmp = v
}
// Verify error/no error for all types.
var errorTests = []ErrorTest{
// All integer divide by zero should error.
ErrorTest{"int 0/0", func() { use(i / j) }, "divide"},
ErrorTest{"int8 0/0", func() { use(i8 / j8) }, "divide"},
ErrorTest{"int16 0/0", func() { use(i16 / j16) }, "divide"},
ErrorTest{"int32 0/0", func() { use(i32 / j32) }, "divide"},
ErrorTest{"int64 0/0", func() { use(i64 / j64) }, "divide"},
ErrorTest{"int 1/0", func() { use(k / j) }, "divide"},
ErrorTest{"int8 1/0", func() { use(k8 / j8) }, "divide"},
ErrorTest{"int16 1/0", func() { use(k16 / j16) }, "divide"},
ErrorTest{"int32 1/0", func() { use(k32 / j32) }, "divide"},
ErrorTest{"int64 1/0", func() { use(k64 / j64) }, "divide"},
// From issue 5790, we should ensure that _ assignments
// still evaluate and generate zerodivide panics.
ErrorTest{"int16 _ = bb[0]/bb[1]", func() { _ = bb[0] / bb[1] }, "divide"},
ErrorTest{"uint 0/0", func() { use(u / v) }, "divide"},
ErrorTest{"uint8 0/0", func() { use(u8 / v8) }, "divide"},
ErrorTest{"uint16 0/0", func() { use(u16 / v16) }, "divide"},
ErrorTest{"uint32 0/0", func() { use(u32 / v32) }, "divide"},
ErrorTest{"uint64 0/0", func() { use(u64 / v64) }, "divide"},
ErrorTest{"uintptr 0/0", func() { use(up / vp) }, "divide"},
ErrorTest{"uint 1/0", func() { use(w / v) }, "divide"},
ErrorTest{"uint8 1/0", func() { use(w8 / v8) }, "divide"},
ErrorTest{"uint16 1/0", func() { use(w16 / v16) }, "divide"},
ErrorTest{"uint32 1/0", func() { use(w32 / v32) }, "divide"},
ErrorTest{"uint64 1/0", func() { use(w64 / v64) }, "divide"},
ErrorTest{"uintptr 1/0", func() { use(wp / vp) }, "divide"},
// All float64ing divide by zero should not error.
ErrorTest{"float64 0/0", func() { use(f / g) }, ""},
ErrorTest{"float32 0/0", func() { use(f32 / g32) }, ""},
ErrorTest{"float64 0/0", func() { use(f64 / g64) }, ""},
ErrorTest{"float64 1/0", func() { use(h / g) }, ""},
ErrorTest{"float32 1/0", func() { use(h32 / g32) }, ""},
ErrorTest{"float64 1/0", func() { use(h64 / g64) }, ""},
ErrorTest{"float64 inf/0", func() { use(inf / g64) }, ""},
ErrorTest{"float64 -inf/0", func() { use(negInf / g64) }, ""},
ErrorTest{"float64 nan/0", func() { use(nan / g64) }, ""},
// All complex divide by zero should not error.
ErrorTest{"complex 0/0", func() { use(c / d) }, ""},
ErrorTest{"complex64 0/0", func() { use(c64 / d64) }, ""},
ErrorTest{"complex128 0/0", func() { use(c128 / d128) }, ""},
ErrorTest{"complex 1/0", func() { use(e / d) }, ""},
ErrorTest{"complex64 1/0", func() { use(e64 / d64) }, ""},
ErrorTest{"complex128 1/0", func() { use(e128 / d128) }, ""},
}
func error_(fn func()) (error string) {
defer func() {
if e := recover(); e != nil {
error = e.(runtime.Error).Error()
}
}()
fn()
return ""
}
type FloatTest struct {
f, g float64
out float64
}
var float64Tests = []FloatTest{
FloatTest{0, 0, nan},
FloatTest{nan, 0, nan},
FloatTest{inf, 0, inf},
FloatTest{negInf, 0, negInf},
}
func alike(a, b float64) bool {
switch {
case math.IsNaN(a) && math.IsNaN(b):
return true
case a == b:
return math.Signbit(a) == math.Signbit(b)
}
return false
}
func main() {
bad := false
for _, t := range errorTests {
err := error_(t.fn)
switch {
case t.err == "" && err == "":
// fine
case t.err != "" && err == "":
if !bad {
bad = true
fmt.Printf("BUG\n")
}
fmt.Printf("%s: expected %q; got no error\n", t.name, t.err)
case t.err == "" && err != "":
if !bad {
bad = true
fmt.Printf("BUG\n")
}
fmt.Printf("%s: expected no error; got %q\n", t.name, err)
case t.err != "" && err != "":
if strings.Index(err, t.err) < 0 {
if !bad {
bad = true
fmt.Printf("BUG\n")
}
fmt.Printf("%s: expected %q; got %q\n", t.name, t.err, err)
continue
}
}
}
// At this point we know we don't error on the values we're testing
for _, t := range float64Tests {
x := t.f / t.g
if !alike(x, t.out) {
if !bad {
bad = true
fmt.Printf("BUG\n")
}
fmt.Printf("%v/%v: expected %g error; got %g\n", t.f, t.g, t.out, x)
}
}
if bad {
panic("zerodivide")
}
}
|
