mirror of
https://github.com/golang/go
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581526ce96
This CL detangles the hairy mess that was convlit+defaultlit. In particular, it makes the following changes: 1. convlit1 now follows the standard typecheck behavior of setting "n.Type = nil" if there's an error. Notably, this means for a lot of test cases, we now avoid reporting useless follow-on error messages. For example, after reporting that "1 << s + 1.0" has an invalid shift, we no longer also report that it can't be assigned to string. 2. Previously, assignconvfn had some extra logic for trying to suppress errors from convlit/defaultlit so that it could provide its own errors with better context information. Instead, this extra context information is now passed down into convlit1 directly. 3. Relatedly, this CL also removes redundant calls to defaultlit prior to assignconv. As a consequence, when an expression doesn't make sense for a particular assignment (e.g., assigning an untyped string to an integer), the error messages now say "untyped string" instead of just "string". This is more consistent with go/types behavior. 4. defaultlit2 is now smarter about only trying to convert pairs of untyped constants when it's likely to succeed. This allows us to report better error messages for things like 3+"x"; instead of "cannot convert 3 to string" we now report "mismatched types untyped number and untyped string". Passes toolstash-check. Change-Id: I26822a02dc35855bd0ac774907b1cf5737e91882 Reviewed-on: https://go-review.googlesource.com/c/go/+/187657 Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org>
250 lines
8.9 KiB
Go
250 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"
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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"
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f1 = h(2 << s) // ERROR "invalid"
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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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