mirror of
https://github.com/golang/go
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e24977d231
The next CL will remove the -G flag, effectively hard-coding it to its current default (-G=3). Change-Id: Ib4743b529206928f9f1cca9fdb19989728327831 Reviewed-on: https://go-review.googlesource.com/c/go/+/388534 Reviewed-by: Keith Randall <khr@golang.org> Trust: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
135 lines
3.0 KiB
Go
135 lines
3.0 KiB
Go
// run
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// Copyright 2021 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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// This test case stress tests a number of subtle cases involving
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// nested type-parameterized declarations. At a high-level, it
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// declares a generic function that contains a generic type
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// declaration:
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//
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// func F[A intish]() {
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// type T[B intish] struct{}
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//
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// // store reflect.Type tuple (A, B, F[A].T[B]) in tests
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// }
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//
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// It then instantiates this function with a variety of type arguments
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// for A and B. Particularly tricky things like shadowed types.
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//
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// From this data it tests two things:
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//
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// 1. Given tuples (A, B, F[A].T[B]) and (A', B', F[A'].T[B']),
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// F[A].T[B] should be identical to F[A'].T[B'] iff (A, B) is
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// identical to (A', B').
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//
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// 2. A few of the instantiations are constructed to be identical, and
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// it tests that exactly these pairs are duplicated (by golden
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// output comparison to nested.out).
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//
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// In both cases, we're effectively using the compiler's existing
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// runtime.Type handling (which is well tested) of type identity of A
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// and B as a way to help bootstrap testing and validate its new
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// runtime.Type handling of F[A].T[B].
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//
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// This isn't perfect, but it smoked out a handful of issues in
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// gotypes2 and unified IR.
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package main
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import (
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"fmt"
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"reflect"
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)
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type test struct {
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TArgs [2]reflect.Type
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Instance reflect.Type
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}
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var tests []test
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type intish interface{ ~int }
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type Int int
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type GlobalInt = Int // allow access to global Int, even when shadowed
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func F[A intish]() {
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add := func(B, T interface{}) {
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tests = append(tests, test{
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TArgs: [2]reflect.Type{
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reflect.TypeOf(A(0)),
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reflect.TypeOf(B),
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},
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Instance: reflect.TypeOf(T),
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})
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}
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type Int int
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type T[B intish] struct{}
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add(int(0), T[int]{})
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add(Int(0), T[Int]{})
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add(GlobalInt(0), T[GlobalInt]{})
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add(A(0), T[A]{}) // NOTE: intentionally dups with int and GlobalInt
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type U[_ any] int
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type V U[int]
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type W V
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add(U[int](0), T[U[int]]{})
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add(U[Int](0), T[U[Int]]{})
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add(U[GlobalInt](0), T[U[GlobalInt]]{})
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add(U[A](0), T[U[A]]{}) // NOTE: intentionally dups with U[int] and U[GlobalInt]
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add(V(0), T[V]{})
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add(W(0), T[W]{})
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}
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func main() {
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type Int int
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F[int]()
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F[Int]()
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F[GlobalInt]()
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type U[_ any] int
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type V U[int]
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type W V
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F[U[int]]()
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F[U[Int]]()
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F[U[GlobalInt]]()
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F[V]()
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F[W]()
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type X[A any] U[X[A]]
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F[X[int]]()
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F[X[Int]]()
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F[X[GlobalInt]]()
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for j, tj := range tests {
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for i, ti := range tests[:j+1] {
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if (ti.TArgs == tj.TArgs) != (ti.Instance == tj.Instance) {
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fmt.Printf("FAIL: %d,%d: %s, but %s\n", i, j, eq(ti.TArgs, tj.TArgs), eq(ti.Instance, tj.Instance))
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}
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// The test is constructed so we should see a few identical types.
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// See "NOTE" comments above.
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if i != j && ti.Instance == tj.Instance {
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fmt.Printf("%d,%d: %v\n", i, j, ti.Instance)
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}
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}
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}
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}
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func eq(a, b interface{}) string {
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op := "=="
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if a != b {
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op = "!="
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}
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return fmt.Sprintf("%v %s %v", a, op, b)
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}
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