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// $G $F.go && $L $F.$A && ./$A.out
// 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.
package main
import (
"fmt"
"math"
"strings"
"syscall"
)
type Error interface {
String() string
}
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
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 float = 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 complex = 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
)
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", },
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 floating divide by zero should not error.
ErrorTest{ "float 0/0", func() { use(f/g) }, "", },
ErrorTest{ "float32 0/0", func() { use(f32/g32) }, "", },
ErrorTest{ "float64 0/0", func() { use(f64/g64) }, "", },
ErrorTest{ "float 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.(Error).String()
}
}()
fn()
return ""
}
type FloatTest struct{
f, g float64
out float64
}
var floatTests = []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() {
for _, t := range errorTests {
if t.err != "" && syscall.OS == "nacl" {
continue
}
err := error(t.fn)
switch {
case t.err == "" && err == "":
// fine
case t.err != "" && err == "":
fmt.Printf("%s: expected %q; got no error\n", t.name, t.err)
case t.err == "" && err != "":
fmt.Printf("%s: expected no error; got %q\n", t.name, err)
case t.err != "" && err != "":
if strings.Index(err, t.err) < 0 {
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 floatTests {
x := t.f/t.g
if !alike(x, t.out) {
fmt.Printf("%v/%v: expected %g error; got %g\n", t.f, t.g, t.out, x)
}
}
}
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