1// errorcheck
2
3// Copyright 2009 The Go Authors. All rights reserved.
4// Use of this source code is governed by a BSD-style
5// license that can be found in the LICENSE file.
6
7// Verify overflow is detected when using numeric constants.
8// Does not compile.
9
10package main
11
12import "unsafe"
13
14type I interface{}
15
16const (
17	// assume all types behave similarly to int8/uint8
18	Int8   int8  = 101
19	Minus1 int8  = -1
20	Uint8  uint8 = 102
21	Const        = 103
22
23	Float32    float32 = 104.5
24	Float64    float64 = 105.5
25	ConstFloat         = 106.5
26	Big        float64 = 1e300
27
28	String = "abc"
29	Bool   = true
30)
31
32var (
33	a1 = Int8 * 100              // ERROR "overflow"
34	a2 = Int8 * -1               // OK
35	a3 = Int8 * 1000             // ERROR "overflow"
36	a4 = Int8 * int8(1000)       // ERROR "overflow"
37	a5 = int8(Int8 * 1000)       // ERROR "overflow"
38	a6 = int8(Int8 * int8(1000)) // ERROR "overflow"
39	a7 = Int8 - 2*Int8 - 2*Int8  // ERROR "overflow"
40	a8 = Int8 * Const / 100      // ERROR "overflow"
41	a9 = Int8 * (Const / 100)    // OK
42
43	b1        = Uint8 * Uint8         // ERROR "overflow"
44	b2        = Uint8 * -1            // ERROR "overflow"
45	b3        = Uint8 - Uint8         // OK
46	b4        = Uint8 - Uint8 - Uint8 // ERROR "overflow"
47	b5        = uint8(^0)             // ERROR "overflow"
48	b5a       = int64(^0)             // OK
49	b6        = ^uint8(0)             // OK
50	b6a       = ^int64(0)             // OK
51	b7        = uint8(Minus1)         // ERROR "overflow"
52	b8        = uint8(int8(-1))       // ERROR "overflow"
53	b8a       = uint8(-1)             // ERROR "overflow"
54	b9   byte = (1 << 10) >> 8        // OK
55	b10  byte = (1 << 10)             // ERROR "overflow"
56	b11  byte = (byte(1) << 10) >> 8  // ERROR "overflow"
57	b12  byte = 1000                  // ERROR "overflow"
58	b13  byte = byte(1000)            // ERROR "overflow"
59	b14  byte = byte(100) * byte(100) // ERROR "overflow"
60	b15  byte = byte(100) * 100       // ERROR "overflow"
61	b16  byte = byte(0) * 1000        // ERROR "overflow"
62	b16a byte = 0 * 1000              // OK
63	b17  byte = byte(0) * byte(1000)  // ERROR "overflow"
64	b18  byte = Uint8 / 0             // ERROR "division by zero"
65
66	c1 float64 = Big
67	c2 float64 = Big * Big          // ERROR "overflow"
68	c3 float64 = float64(Big) * Big // ERROR "overflow"
69	c4         = Big * Big          // ERROR "overflow"
70	c5         = Big / 0            // ERROR "division by zero"
71	c6         = 1000 % 1e3         // ERROR "floating-point % operation|expected integer type"
72)
73
74func f(int)
75
76func main() {
77	f(Int8)             // ERROR "convert|wrong type|cannot"
78	f(Minus1)           // ERROR "convert|wrong type|cannot"
79	f(Uint8)            // ERROR "convert|wrong type|cannot"
80	f(Const)            // OK
81	f(Float32)          // ERROR "convert|wrong type|cannot"
82	f(Float64)          // ERROR "convert|wrong type|cannot"
83	f(ConstFloat)       // ERROR "truncate"
84	f(ConstFloat - 0.5) // OK
85	f(Big)              // ERROR "convert|wrong type|cannot"
86	f(String)           // ERROR "convert|wrong type|cannot|incompatible"
87	f(Bool)             // ERROR "convert|wrong type|cannot|incompatible"
88}
89
90const ptr = nil // ERROR "const.*nil"
91const _ = string([]byte(nil)) // ERROR "is not a? ?constant"
92const _ = uintptr(unsafe.Pointer((*int)(nil))) // ERROR "is not a? ?constant"
93const _ = unsafe.Pointer((*int)(nil)) // ERROR "cannot be nil|invalid constant type"
94const _ = (*int)(nil) // ERROR "cannot be nil|invalid constant type"
95