mirror of
https://github.com/golang/go
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088a9ad543
Per the decision for #14844, index expressions that are non-constant shifts where the LHS operand is representable as an int are now valid. Fixes #21693. Change-Id: Ifafad2c0c65975e0200ce7e28d1db210e0eacd9d Reviewed-on: https://go-review.googlesource.com/81277 Reviewed-by: Matthew Dempsky <mdempsky@google.com>
249 lines
8.9 KiB
Go
249 lines
8.9 KiB
Go
// errorcheck
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// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test illegal shifts.
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// Issue 1708, illegal cases.
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// Does not compile.
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package p
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func f(x int) int { return 0 }
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func g(x interface{}) int { return 0 }
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func h(x float64) int { return 0 }
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// from the spec
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var (
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s uint = 33
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u = 1.0 << s // ERROR "invalid operation|shift of non-integer operand"
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v float32 = 1 << s // ERROR "invalid" "as type float32"
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)
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// non-constant shift expressions
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var (
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e1 = g(2.0 << s) // ERROR "invalid|shift of non-integer operand" "as type interface"
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f1 = h(2 << s) // ERROR "invalid" "as type float64"
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g1 int64 = 1.1 << s // ERROR "truncated"
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)
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// constant shift expressions
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const c uint = 65
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var (
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a2 int = 1.0 << c // ERROR "overflow"
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b2 = 1.0 << c // ERROR "overflow"
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d2 = f(1.0 << c) // ERROR "overflow"
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)
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var (
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// issues 4882, 4936.
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a3 = 1.0<<s + 0 // ERROR "invalid|shift of non-integer operand"
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// issue 4937
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b3 = 1<<s + 1 + 1.0 // ERROR "invalid|shift of non-integer operand"
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// issue 5014
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c3 = complex(1<<s, 0) // ERROR "invalid|shift of type float64"
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d3 int = complex(1<<s, 3) // ERROR "non-integer|cannot use.*as type int" "shift of type float64"
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e3 = real(1 << s) // ERROR "invalid"
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f3 = imag(1 << s) // ERROR "invalid"
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)
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// from the spec
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func _() {
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var (
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s uint = 33
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i = 1 << s // 1 has type int
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j int32 = 1 << s // 1 has type int32; j == 0
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k = uint64(1 << s) // 1 has type uint64; k == 1<<33
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m int = 1.0 << s // 1.0 has type int
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n = 1.0<<s != i // 1.0 has type int; n == false if ints are 32bits in size
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o = 1<<s == 2<<s // 1 and 2 have type int; o == true if ints are 32bits in size
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// next test only fails on 32bit systems
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// p = 1<<s == 1<<33 // illegal if ints are 32bits in size: 1 has type int, but 1<<33 overflows int
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u = 1.0 << s // ERROR "non-integer|float64"
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u1 = 1.0<<s != 0 // ERROR "non-integer|float64"
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u2 = 1<<s != 1.0 // ERROR "non-integer|float64"
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v float32 = 1 << s // ERROR "non-integer|float32"
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w int64 = 1.0 << 33 // 1.0<<33 is a constant shift expression
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_, _, _, _, _, _, _, _, _, _ = j, k, m, n, o, u, u1, u2, v, w
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)
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// non constants arguments trigger a different path
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f2 := 1.2
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s2 := "hi"
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_ = f2 << 2 // ERROR "shift of type float64"
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_ = s2 << 2 // ERROR "shift of type string"
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}
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// shifts in comparisons w/ untyped operands
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var (
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_ = 1<<s == 1
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_ = 1<<s == 1. // ERROR "invalid|shift of type float64"
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_ = 1.<<s == 1 // ERROR "invalid|shift of type float64"
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_ = 1.<<s == 1. // ERROR "invalid|non-integer|shift of type float64"
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_ = 1<<s+1 == 1
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_ = 1<<s+1 == 1. // ERROR "invalid|shift of type float64"
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_ = 1<<s+1. == 1 // ERROR "invalid|shift of type float64"
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_ = 1<<s+1. == 1. // ERROR "invalid|shift of type float64"
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_ = 1.<<s+1 == 1 // ERROR "invalid|shift of type float64"
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_ = 1.<<s+1 == 1. // ERROR "invalid|shift of type float64"
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_ = 1.<<s+1. == 1 // ERROR "invalid|shift of type float64"
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_ = 1.<<s+1. == 1. // ERROR "invalid|non-integer|shift of type float64"
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_ = 1<<s == 1<<s
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_ = 1<<s == 1.<<s // ERROR "invalid|shift of type float64"
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_ = 1.<<s == 1<<s // ERROR "invalid|shift of type float64"
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_ = 1.<<s == 1.<<s // ERROR "invalid|non-integer|shift of type float64"
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_ = 1<<s+1<<s == 1
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_ = 1<<s+1<<s == 1. // ERROR "invalid|shift of type float64"
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_ = 1<<s+1.<<s == 1 // ERROR "invalid|shift of type float64"
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_ = 1<<s+1.<<s == 1. // ERROR "invalid|shift of type float64"
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_ = 1.<<s+1<<s == 1 // ERROR "invalid|shift of type float64"
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_ = 1.<<s+1<<s == 1. // ERROR "invalid|shift of type float64"
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_ = 1.<<s+1.<<s == 1 // ERROR "invalid|shift of type float64"
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_ = 1.<<s+1.<<s == 1. // ERROR "invalid|non-integer|shift of type float64"
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_ = 1<<s+1<<s == 1<<s+1<<s
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_ = 1<<s+1<<s == 1<<s+1.<<s // ERROR "invalid|shift of type float64"
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_ = 1<<s+1<<s == 1.<<s+1<<s // ERROR "invalid|shift of type float64"
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_ = 1<<s+1<<s == 1.<<s+1.<<s // ERROR "invalid|shift of type float64"
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_ = 1<<s+1.<<s == 1<<s+1<<s // ERROR "invalid|shift of type float64"
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_ = 1<<s+1.<<s == 1<<s+1.<<s // ERROR "invalid|shift of type float64"
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_ = 1<<s+1.<<s == 1.<<s+1<<s // ERROR "invalid|shift of type float64"
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_ = 1<<s+1.<<s == 1.<<s+1.<<s // ERROR "invalid|non-integer|shift of type float64"
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_ = 1.<<s+1<<s == 1<<s+1<<s // ERROR "invalid|shift of type float64"
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_ = 1.<<s+1<<s == 1<<s+1.<<s // ERROR "invalid|shift of type float64"
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_ = 1.<<s+1<<s == 1.<<s+1<<s // ERROR "invalid|shift of type float64"
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_ = 1.<<s+1<<s == 1.<<s+1.<<s // ERROR "invalid|non-integer|shift of type float64"
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_ = 1.<<s+1.<<s == 1<<s+1<<s // ERROR "invalid|shift of type float64"
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_ = 1.<<s+1.<<s == 1<<s+1.<<s // ERROR "invalid|non-integer|shift of type float64"
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_ = 1.<<s+1.<<s == 1.<<s+1<<s // ERROR "invalid|non-integer|shift of type float64"
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_ = 1.<<s+1.<<s == 1.<<s+1.<<s // ERROR "invalid|non-integer|shift of type float64"
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)
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// shifts in comparisons w/ typed operands
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var (
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x int
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_ = 1<<s == x
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_ = 1.<<s == x
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_ = 1.1<<s == x // ERROR "truncated"
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_ = 1<<s+x == 1
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_ = 1<<s+x == 1.
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_ = 1<<s+x == 1.1 // ERROR "truncated"
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_ = 1.<<s+x == 1
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_ = 1.<<s+x == 1.
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_ = 1.<<s+x == 1.1 // ERROR "truncated"
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_ = 1.1<<s+x == 1 // ERROR "truncated"
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_ = 1.1<<s+x == 1. // ERROR "truncated"
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_ = 1.1<<s+x == 1.1 // ERROR "truncated"
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_ = 1<<s == x<<s
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_ = 1.<<s == x<<s
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_ = 1.1<<s == x<<s // ERROR "truncated"
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)
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// shifts as operands in non-arithmetic operations and as arguments
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func _() {
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var s uint
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var a []int
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_ = a[1<<s]
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_ = a[1.]
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_ = a[1.<<s]
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_ = a[1.1<<s] // ERROR "integer|shift of type float64"
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_ = make([]int, 1)
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_ = make([]int, 1.)
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_ = make([]int, 1.<<s)
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_ = make([]int, 1.1<<s) // ERROR "non-integer|truncated"
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_ = float32(1)
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_ = float32(1 << s) // ERROR "non-integer|shift of type float32"
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_ = float32(1.)
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_ = float32(1. << s) // ERROR "non-integer|shift of type float32"
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_ = float32(1.1 << s) // ERROR "non-integer|shift of type float32"
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_ = append(a, 1<<s)
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_ = append(a, 1.<<s)
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_ = append(a, 1.1<<s) // ERROR "truncated"
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var b []float32
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_ = append(b, 1<<s) // ERROR "non-integer|type float32"
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_ = append(b, 1.<<s) // ERROR "non-integer|type float32"
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_ = append(b, 1.1<<s) // ERROR "non-integer|type float32"
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_ = complex(1.<<s, 0) // ERROR "non-integer|shift of type float64"
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_ = complex(1.1<<s, 0) // ERROR "non-integer|shift of type float64"
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_ = complex(0, 1.<<s) // ERROR "non-integer|shift of type float64"
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_ = complex(0, 1.1<<s) // ERROR "non-integer|shift of type float64"
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var a4 float64
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var b4 int
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_ = complex(1<<s, a4) // ERROR "non-integer|shift of type float64"
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_ = complex(1<<s, b4) // ERROR "invalid|non-integer|"
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var m1 map[int]string
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delete(m1, 1<<s)
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delete(m1, 1.<<s)
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delete(m1, 1.1<<s) // ERROR "truncated|shift of type float64"
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var m2 map[float32]string
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delete(m2, 1<<s) // ERROR "invalid|cannot use 1 << s as type float32"
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delete(m2, 1.<<s) // ERROR "invalid|cannot use 1 << s as type float32"
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delete(m2, 1.1<<s) // ERROR "invalid|cannot use 1.1 << s as type float32"
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}
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// shifts of shifts
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func _() {
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var s uint
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_ = 1 << (1 << s)
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_ = 1 << (1. << s)
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_ = 1 << (1.1 << s) // ERROR "non-integer|truncated"
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_ = 1. << (1 << s) // ERROR "non-integer|shift of type float64"
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_ = 1. << (1. << s) // ERROR "non-integer|shift of type float64"
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_ = 1.1 << (1.1 << s) // ERROR "invalid|non-integer|truncated"
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_ = (1 << s) << (1 << s)
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_ = (1 << s) << (1. << s)
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_ = (1 << s) << (1.1 << s) // ERROR "truncated"
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_ = (1. << s) << (1 << s) // ERROR "non-integer|shift of type float64"
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_ = (1. << s) << (1. << s) // ERROR "non-integer|shift of type float64"
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_ = (1.1 << s) << (1.1 << s) // ERROR "invalid|non-integer|truncated"
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var x int
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x = 1 << (1 << s)
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x = 1 << (1. << s)
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x = 1 << (1.1 << s) // ERROR "truncated"
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x = 1. << (1 << s)
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x = 1. << (1. << s)
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x = 1.1 << (1.1 << s) // ERROR "truncated"
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x = (1 << s) << (1 << s)
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x = (1 << s) << (1. << s)
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x = (1 << s) << (1.1 << s) // ERROR "truncated"
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x = (1. << s) << (1 << s)
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x = (1. << s) << (1. << s)
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x = (1.1 << s) << (1.1 << s) // ERROR "truncated"
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var y float32
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y = 1 << (1 << s) // ERROR "non-integer|type float32"
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y = 1 << (1. << s) // ERROR "non-integer|type float32"
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y = 1 << (1.1 << s) // ERROR "invalid|truncated|float32"
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y = 1. << (1 << s) // ERROR "non-integer|type float32"
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y = 1. << (1. << s) // ERROR "non-integer|type float32"
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y = 1.1 << (1.1 << s) // ERROR "invalid|truncated|float32"
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var z complex128
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z = (1 << s) << (1 << s) // ERROR "non-integer|type complex128"
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z = (1 << s) << (1. << s) // ERROR "non-integer|type complex128"
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z = (1 << s) << (1.1 << s) // ERROR "invalid|truncated|complex128"
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z = (1. << s) << (1 << s) // ERROR "non-integer|type complex128"
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z = (1. << s) << (1. << s) // ERROR "non-integer|type complex128"
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z = (1.1 << s) << (1.1 << s) // ERROR "invalid|truncated|complex128"
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_, _, _ = x, y, z
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}
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