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Code Editor : shifts.src
// Copyright 2013 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 shifts func shifts0() { // basic constant shifts const ( s = 10 _ = 0<<0 _ = 1<<s _ = 1<<- /* ERROR "negative shift count" */ 1 // For the test below we may decide to convert to int // rather than uint and then report a negative shift // count instead, which might be a better error. The // (minor) difference is that this would restrict the // shift count range by half (from all uint values to // the positive int values). // This depends on the exact spec wording which is not // done yet. // TODO(gri) revisit and adjust when spec change is done _ = 1<<- /* ERROR "truncated to uint" */ 1.0 _ = 1<<1075 /* ERROR "invalid shift" */ _ = 2.0<<1 _ = 1<<1.0 _ = 1<<(1+0i) _ int = 2<<s _ float32 = 2<<s _ complex64 = 2<<s _ int = 2.0<<s _ float32 = 2.0<<s _ complex64 = 2.0<<s _ int = 'a'<<s _ float32 = 'a'<<s _ complex64 = 'a'<<s ) } func shifts1() { // basic non-constant shifts var ( i int u uint _ = 1<<0 _ = 1<<i _ = 1<<u _ = 1<<"foo" /* ERROR "cannot convert" */ _ = i<<0 _ = i<<- /* ERROR "negative shift count" */ 1 _ = i<<1.0 _ = 1<<(1+0i) _ = 1 /* ERROR "overflows" */ <<100 _ uint = 1 << 0 _ uint = 1 << u _ float32 = 1 /* ERROR "must be integer" */ << u // for issue 14822 _ = 1<<( /* ERROR "invalid shift count" */ 1<<64-1) _ = 1<<( /* ERROR "invalid shift count" */ 1<<64) _ = u<<(1<<63) // valid _ = u<<(1<<64) // valid ) } func shifts2() { // from the spec var ( s uint = 33 i = 1<<s // 1 has type int j int32 = 1<<s // 1 has type int32; j == 0 k = uint64(1<<s) // 1 has type uint64; k == 1<<33 m int = 1.0<<s // 1.0 has type int n = 1.0<<s != i // 1.0 has type int; n == false if ints are 32bits in size o = 1<<s == 2<<s // 1 and 2 have type int; o == true if ints are 32bits in size p = 1<<s == 1<<33 // illegal if ints are 32bits in size: 1 has type int, but 1<<33 overflows int u = 1.0 /* ERROR "must be integer" */ <<s // illegal: 1.0 has type float64, cannot shift u1 = 1.0 /* ERROR "must be integer" */ <<s != 0 // illegal: 1.0 has type float64, cannot shift u2 = 1 /* ERROR "must be integer" */ <<s != 1.0 // illegal: 1 has type float64, cannot shift v float32 = 1 /* ERROR "must be integer" */ <<s // illegal: 1 has type float32, cannot shift w int64 = 1.0<<33 // 1.0<<33 is a constant shift expression ) _, _, _, _, _, _, _, _, _, _, _, _ = i, j, k, m, n, o, p, u, u1, u2, v, w } func shifts3(a int16, b float32) { // random tests var ( s uint = 11 u = 1 /* ERROR "must be integer" */ <<s + 1.0 v complex128 = 1 /* ERROR "must be integer" */ << s + 1.0 /* ERROR "must be integer" */ << s + 1 ) x := 1.0 /* ERROR "must be integer" */ <<s + 1 shifts3(1.0 << s, 1 /* ERROR "must be integer" */ >> s) _, _, _ = u, v, x } func shifts4() { // shifts in comparisons w/ untyped operands var s uint _ = 1<<s == 1 _ = 1 /* ERROR "integer" */ <<s == 1. _ = 1. /* ERROR "integer" */ <<s == 1 _ = 1. /* ERROR "integer" */ <<s == 1. _ = 1<<s + 1 == 1 _ = 1 /* ERROR "integer" */ <<s + 1 == 1. _ = 1 /* ERROR "integer" */ <<s + 1. == 1 _ = 1 /* ERROR "integer" */ <<s + 1. == 1. _ = 1. /* ERROR "integer" */ <<s + 1 == 1 _ = 1. /* ERROR "integer" */ <<s + 1 == 1. _ = 1. /* ERROR "integer" */ <<s + 1. == 1 _ = 1. /* ERROR "integer" */ <<s + 1. == 1. _ = 1<<s == 1<<s _ = 1 /* ERROR "integer" */ <<s == 1. /* ERROR "integer" */ <<s _ = 1. /* ERROR "integer" */ <<s == 1 /* ERROR "integer" */ <<s _ = 1. /* ERROR "integer" */ <<s == 1. /* ERROR "integer" */ <<s _ = 1<<s + 1<<s == 1 _ = 1 /* ERROR "integer" */ <<s + 1 /* ERROR "integer" */ <<s == 1. _ = 1 /* ERROR "integer" */ <<s + 1. /* ERROR "integer" */ <<s == 1 _ = 1 /* ERROR "integer" */ <<s + 1. /* ERROR "integer" */ <<s == 1. _ = 1. /* ERROR "integer" */ <<s + 1 /* ERROR "integer" */ <<s == 1 _ = 1. /* ERROR "integer" */ <<s + 1 /* ERROR "integer" */ <<s == 1. _ = 1. /* ERROR "integer" */ <<s + 1. /* ERROR "integer" */ <<s == 1 _ = 1. /* ERROR "integer" */ <<s + 1. /* ERROR "integer" */ <<s == 1. _ = 1<<s + 1<<s == 1<<s + 1<<s _ = 1 /* ERROR "integer" */ <<s + 1 /* ERROR "integer" */ <<s == 1 /* ERROR "integer" */ <<s + 1. /* ERROR "integer" */ <<s _ = 1 /* ERROR "integer" */ <<s + 1 /* ERROR "integer" */ <<s == 1. /* ERROR "integer" */ <<s + 1 /* ERROR "integer" */ <<s _ = 1 /* ERROR "integer" */ <<s + 1 /* ERROR "integer" */ <<s == 1. /* ERROR "integer" */ <<s + 1. /* ERROR "integer" */ <<s _ = 1 /* ERROR "integer" */ <<s + 1. /* ERROR "integer" */ <<s == 1 /* ERROR "integer" */ <<s + 1 /* ERROR "integer" */ <<s _ = 1 /* ERROR "integer" */ <<s + 1. /* ERROR "integer" */ <<s == 1 /* ERROR "integer" */ <<s + 1. /* ERROR "integer" */ <<s _ = 1 /* ERROR "integer" */ <<s + 1. /* ERROR "integer" */ <<s == 1. /* ERROR "integer" */ <<s + 1 /* ERROR "integer" */ <<s _ = 1 /* ERROR "integer" */ <<s + 1. /* ERROR "integer" */ <<s == 1. /* ERROR "integer" */ <<s + 1. /* ERROR "integer" */ <<s _ = 1. /* ERROR "integer" */ <<s + 1 /* ERROR "integer" */ <<s == 1 /* ERROR "integer" */ <<s + 1 /* ERROR "integer" */ <<s _ = 1. /* ERROR "integer" */ <<s + 1 /* ERROR "integer" */ <<s == 1 /* ERROR "integer" */ <<s + 1. /* ERROR "integer" */ <<s _ = 1. /* ERROR "integer" */ <<s + 1 /* ERROR "integer" */ <<s == 1. /* ERROR "integer" */ <<s + 1 /* ERROR "integer" */ <<s _ = 1. /* ERROR "integer" */ <<s + 1 /* ERROR "integer" */ <<s == 1. /* ERROR "integer" */ <<s + 1. /* ERROR "integer" */ <<s _ = 1. /* ERROR "integer" */ <<s + 1. /* ERROR "integer" */ <<s == 1 /* ERROR "integer" */ <<s + 1 /* ERROR "integer" */ <<s _ = 1. /* ERROR "integer" */ <<s + 1. /* ERROR "integer" */ <<s == 1 /* ERROR "integer" */ <<s + 1. /* ERROR "integer" */ <<s _ = 1. /* ERROR "integer" */ <<s + 1. /* ERROR "integer" */ <<s == 1. /* ERROR "integer" */ <<s + 1 /* ERROR "integer" */ <<s _ = 1. /* ERROR "integer" */ <<s + 1. /* ERROR "integer" */ <<s == 1. /* ERROR "integer" */ <<s + 1. /* ERROR "integer" */ <<s } func shifts5() { // shifts in comparisons w/ typed operands var s uint var x int _ = 1<<s == x _ = 1.<<s == x _ = 1.1 /* ERROR "int" */ <<s == x _ = 1<<s + x == 1 _ = 1<<s + x == 1. _ = 1<<s + x == 1.1 /* ERROR "int" */ _ = 1.<<s + x == 1 _ = 1.<<s + x == 1. _ = 1.<<s + x == 1.1 /* ERROR "int" */ _ = 1.1 /* ERROR "int" */ <<s + x == 1 _ = 1.1 /* ERROR "int" */ <<s + x == 1. _ = 1.1 /* ERROR "int" */ <<s + x == 1.1 _ = 1<<s == x<<s _ = 1.<<s == x<<s _ = 1.1 /* ERROR "int" */ <<s == x<<s } func shifts6() { // shifts as operands in non-arithmetic operations and as arguments var a [10]int var s uint _ = a[1<<s] _ = a[1.0] _ = a[1.0<<s] _ = make([]int, 1.0) _ = make([]int, 1.0<<s) _ = make([]int, 1.1 /* ERROR "must be integer" */ <<s) _ = float32(1) _ = float32(1 /* ERROR "must be integer" */ <<s) _ = float32(1.0) _ = float32(1.0 /* ERROR "must be integer" */ <<s) _ = float32(1.1 /* ERROR "must be integer" */ <<s) var b []int _ = append(b, 1<<s) _ = append(b, 1.0<<s) _ = append(b, 1.1 /* ERROR "must be integer" */ <<s) _ = append(b, 1<<s) _ = append(b, 1.0<<s) // should fail - see TODO in append code _ = append(b, 1.1 /* ERROR "must be integer" */ <<s) _ = complex(1.0 /* ERROR "must be integer" */ <<s, 0) _ = complex(1.1 /* ERROR "must be integer" */ <<s, 0) _ = complex(0, 1.0 /* ERROR "must be integer" */ <<s) _ = complex(0, 1.1 /* ERROR "must be integer" */ <<s) // TODO(gri) The delete below is not type-checked correctly yet. // var m1 map[int]string // delete(m1, 1<<s) } func shifts7() { // shifts of shifts var s uint var x int _ = x _ = 1<<(1<<s) _ = 1<<(1.<<s) _ = 1. /* ERROR "integer" */ <<(1<<s) _ = 1. /* ERROR "integer" */ <<(1.<<s) x = 1<<(1<<s) x = 1<<(1.<<s) x = 1.<<(1<<s) x = 1.<<(1.<<s) _ = (1<<s)<<(1<<s) _ = (1<<s)<<(1.<<s) _ = ( /* ERROR "integer" */ 1.<<s)<<(1<<s) _ = ( /* ERROR "integer" */ 1.<<s)<<(1.<<s) x = (1<<s)<<(1<<s) x = (1<<s)<<(1.<<s) x = ( /* ERROR "integer" */ 1.<<s)<<(1<<s) x = ( /* ERROR "integer" */ 1.<<s)<<(1.<<s) } func shifts8() { // shift examples from shift discussion: better error messages var s uint _ = 1.0 /* ERROR "shifted operand 1.0 \(type float64\) must be integer" */ <<s == 1 _ = 1.0 /* ERROR "shifted operand 1.0 \(type float64\) must be integer" */ <<s == 1.0 _ = 1 /* ERROR "shifted operand 1 \(type float64\) must be integer" */ <<s == 1.0 _ = 1 /* ERROR "shifted operand 1 \(type float64\) must be integer" */ <<s + 1.0 == 1 _ = 1 /* ERROR "shifted operand 1 \(type float64\) must be integer" */ <<s + 1.1 == 1 _ = 1 /* ERROR "shifted operand 1 \(type float64\) must be integer" */ <<s + 1 == 1.0 // additional cases _ = complex(1.0 /* ERROR "shifted operand 1.0 \(type float64\) must be integer" */ <<s, 1) _ = complex(1.0, 1 /* ERROR "shifted operand 1 \(type float64\) must be integer" */ <<s) _ = int(1.<<s) _ = int(1.1 /* ERROR "shifted operand .* must be integer" */ <<s) _ = float32(1 /* ERROR "shifted operand .* must be integer" */ <<s) _ = float32(1. /* ERROR "shifted operand .* must be integer" */ <<s) _ = float32(1.1 /* ERROR "shifted operand .* must be integer" */ <<s) // TODO(gri) the error messages for these two are incorrect - disabled for now // _ = complex64(1<<s) // _ = complex64(1.<<s) _ = complex64(1.1 /* ERROR "shifted operand .* must be integer" */ <<s) } func shifts9() { // various originally failing snippets of code from the std library // from src/compress/lzw/reader.go:90 { var d struct { bits uint32 width uint } _ = uint16(d.bits & (1<<d.width - 1)) } // from src/debug/dwarf/buf.go:116 { var ux uint64 var bits uint x := int64(ux) if x&(1<<(bits-1)) != 0 {} } // from src/encoding/asn1/asn1.go:160 { var bytes []byte if bytes[len(bytes)-1]&((1<<bytes[0])-1) != 0 {} } // from src/math/big/rat.go:140 { var exp int var mantissa uint64 shift := uint64(-1022 - (exp - 1)) // [1..53) _ = mantissa & (1<<shift - 1) } // from src/net/interface.go:51 { type Flags uint var f Flags var i int if f&(1<<uint(i)) != 0 {} } // from src/runtime/softfloat64.go:234 { var gm uint64 var shift uint _ = gm & (1<<shift - 1) } // from src/strconv/atof.go:326 { var mant uint64 var mantbits uint if mant == 2<<mantbits {} } // from src/route_bsd.go:82 { var Addrs int32 const rtaRtMask = 1 var i uint if Addrs&rtaRtMask&(1<<i) == 0 {} } // from src/text/scanner/scanner.go:540 { var s struct { Whitespace uint64 } var ch rune for s.Whitespace&(1<<uint(ch)) != 0 {} } } func issue5895() { var x = 'a' << 1 // type of x must be rune var _ rune = x } func issue11325() { var _ = 0 >> 1.1 /* ERROR "truncated to uint" */ // example from issue 11325 _ = 0 >> 1.1 /* ERROR "truncated to uint" */ _ = 0 << 1.1 /* ERROR "truncated to uint" */ _ = 0 >> 1. _ = 1 >> 1.1 /* ERROR "truncated to uint" */ _ = 1 >> 1. _ = 1. >> 1 _ = 1. >> 1. _ = 1.1 /* ERROR "must be integer" */ >> 1 } func issue11594() { var _ = complex64 /* ERROR "must be integer" */ (1) << 2 // example from issue 11594 _ = float32 /* ERROR "must be integer" */ (0) << 1 _ = float64 /* ERROR "must be integer" */ (0) >> 2 _ = complex64 /* ERROR "must be integer" */ (0) << 3 _ = complex64 /* ERROR "must be integer" */ (0) >> 4 } func issue21727() { var s uint var a = make([]int, 1<<s + 1.2 /* ERROR "truncated to int" */ ) var _ = a[1<<s - 2.3 /* ERROR "truncated to int" */ ] var _ int = 1<<s + 3.4 /* ERROR "truncated to int" */ var _ = string(1 << s) var _ = string(1.0 /* ERROR "cannot convert" */ << s) } func issue22969() { var s uint var a []byte _ = a[0xffffffffffffffff /* ERROR "overflows int" */ <<s] // example from issue 22969 _ = make([]int, 0xffffffffffffffff /* ERROR "overflows int" */ << s) _ = make([]int, 0, 0xffffffffffffffff /* ERROR "overflows int" */ << s) var _ byte = 0x100 /* ERROR "overflows byte" */ << s var _ int8 = 0xff /* ERROR "overflows int8" */ << s var _ int16 = 0xffff /* ERROR "overflows int16" */ << s var _ int32 = 0x80000000 /* ERROR "overflows int32" */ << s }
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