| // errorcheck |
| |
| // 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. |
| |
| // Verify overflow is detected when using numeric constants. |
| // Does not compile. |
| |
| package main |
| |
| import "unsafe" |
| |
| type I interface{} |
| |
| const ( |
| // assume all types behave similarly to int8/uint8 |
| Int8 int8 = 101 |
| Minus1 int8 = -1 |
| Uint8 uint8 = 102 |
| Const = 103 |
| |
| Float32 float32 = 104.5 |
| Float64 float64 = 105.5 |
| ConstFloat = 106.5 |
| Big float64 = 1e300 |
| |
| String = "abc" |
| Bool = true |
| ) |
| |
| var ( |
| a1 = Int8 * 100 // ERROR "overflow" |
| a2 = Int8 * -1 // OK |
| a3 = Int8 * 1000 // ERROR "overflow" |
| a4 = Int8 * int8(1000) // ERROR "overflow" |
| a5 = int8(Int8 * 1000) // ERROR "overflow" |
| a6 = int8(Int8 * int8(1000)) // ERROR "overflow" |
| a7 = Int8 - 2*Int8 - 2*Int8 // ERROR "overflow" |
| a8 = Int8 * Const / 100 // ERROR "overflow" |
| a9 = Int8 * (Const / 100) // OK |
| |
| b1 = Uint8 * Uint8 // ERROR "overflow" |
| b2 = Uint8 * -1 // ERROR "overflow" |
| b3 = Uint8 - Uint8 // OK |
| b4 = Uint8 - Uint8 - Uint8 // ERROR "overflow" |
| b5 = uint8(^0) // ERROR "overflow" |
| b5a = int64(^0) // OK |
| b6 = ^uint8(0) // OK |
| b6a = ^int64(0) // OK |
| b7 = uint8(Minus1) // ERROR "overflow" |
| b8 = uint8(int8(-1)) // ERROR "overflow" |
| b8a = uint8(-1) // ERROR "overflow" |
| b9 byte = (1 << 10) >> 8 // OK |
| b10 byte = (1 << 10) // ERROR "overflow" |
| b11 byte = (byte(1) << 10) >> 8 // ERROR "overflow" |
| b12 byte = 1000 // ERROR "overflow" |
| b13 byte = byte(1000) // ERROR "overflow" |
| b14 byte = byte(100) * byte(100) // ERROR "overflow" |
| b15 byte = byte(100) * 100 // ERROR "overflow" |
| b16 byte = byte(0) * 1000 // ERROR "overflow" |
| b16a byte = 0 * 1000 // OK |
| b17 byte = byte(0) * byte(1000) // ERROR "overflow" |
| b18 byte = Uint8 / 0 // ERROR "division by zero" |
| |
| c1 float64 = Big |
| c2 float64 = Big * Big // ERROR "overflow" |
| c3 float64 = float64(Big) * Big // ERROR "overflow" |
| c4 = Big * Big // ERROR "overflow" |
| c5 = Big / 0 // ERROR "division by zero" |
| c6 = 1000 % 1e3 // ERROR "floating-point % operation|expected integer type" |
| ) |
| |
| func f(int) |
| |
| func main() { |
| f(Int8) // ERROR "convert|wrong type|cannot" |
| f(Minus1) // ERROR "convert|wrong type|cannot" |
| f(Uint8) // ERROR "convert|wrong type|cannot" |
| f(Const) // OK |
| f(Float32) // ERROR "convert|wrong type|cannot" |
| f(Float64) // ERROR "convert|wrong type|cannot" |
| f(ConstFloat) // ERROR "truncate" |
| f(ConstFloat - 0.5) // OK |
| f(Big) // ERROR "convert|wrong type|cannot" |
| f(String) // ERROR "convert|wrong type|cannot|incompatible" |
| f(Bool) // ERROR "convert|wrong type|cannot|incompatible" |
| } |
| |
| const ptr = nil // ERROR "const.*nil" |
| const _ = string([]byte(nil)) // ERROR "is not a constant" |
| const _ = uintptr(unsafe.Pointer((*int)(nil))) // ERROR "is not a constant" |
| const _ = unsafe.Pointer((*int)(nil)) // ERROR "cannot be nil" |
| const _ = (*int)(nil) // ERROR "cannot be nil" |