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Diffstat (limited to '')
| -rw-r--r-- | test/const1.go | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/test/const1.go b/test/const1.go new file mode 100644 index 0000000..1efe688 --- /dev/null +++ b/test/const1.go @@ -0,0 +1,94 @@ +// 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|cannot convert" + a2 = Int8 * -1 // OK + a3 = Int8 * 1000 // ERROR "overflow|cannot convert" + a4 = Int8 * int8(1000) // ERROR "overflow|cannot convert" + a5 = int8(Int8 * 1000) // ERROR "overflow|cannot convert" + a6 = int8(Int8 * int8(1000)) // ERROR "overflow|cannot convert" + a7 = Int8 - 2*Int8 - 2*Int8 // ERROR "overflow|cannot convert" + a8 = Int8 * Const / 100 // ERROR "overflow|cannot convert" + a9 = Int8 * (Const / 100) // OK + + b1 = Uint8 * Uint8 // ERROR "overflow|cannot convert" + b2 = Uint8 * -1 // ERROR "overflow|cannot convert" + b3 = Uint8 - Uint8 // OK + b4 = Uint8 - Uint8 - Uint8 // ERROR "overflow|cannot convert" + b5 = uint8(^0) // ERROR "overflow|cannot convert" + b5a = int64(^0) // OK + b6 = ^uint8(0) // OK + b6a = ^int64(0) // OK + b7 = uint8(Minus1) // ERROR "overflow|cannot convert" + b8 = uint8(int8(-1)) // ERROR "overflow|cannot convert" + b8a = uint8(-1) // ERROR "overflow|cannot convert" + b9 byte = (1 << 10) >> 8 // OK + b10 byte = (1 << 10) // ERROR "overflow|cannot convert" + b11 byte = (byte(1) << 10) >> 8 // ERROR "overflow|cannot convert" + b12 byte = 1000 // ERROR "overflow|cannot convert" + b13 byte = byte(1000) // ERROR "overflow|cannot convert" + b14 byte = byte(100) * byte(100) // ERROR "overflow|cannot convert" + b15 byte = byte(100) * 100 // ERROR "overflow|cannot convert" + b16 byte = byte(0) * 1000 // ERROR "overflow|cannot convert" + b16a byte = 0 * 1000 // OK + b17 byte = byte(0) * byte(1000) // ERROR "overflow|cannot convert" + b18 byte = Uint8 / 0 // ERROR "division by zero" + + c1 float64 = Big + c2 float64 = Big * Big // ERROR "overflow|cannot convert" + c3 float64 = float64(Big) * Big // ERROR "overflow|cannot convert" + c4 = Big * Big // ERROR "overflow|cannot convert" + c5 = Big / 0 // ERROR "division by zero" + c6 = 1000 % 1e3 // ERROR "invalid 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|not constant" +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|invalid constant type|is not a constant|not constant" +const _ = (*int)(nil) // ERROR "cannot be nil|invalid constant type|is not a constant|not constant" |