| 1 | // Copyright 2021 The Go Authors. All rights reserved. |
|---|---|
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | // go:build ignore |
| 6 | |
| 7 | package testdata |
| 8 | |
| 9 | type I interface { |
| 10 | Foo() |
| 11 | } |
| 12 | |
| 13 | type J interface { |
| 14 | I |
| 15 | Bar() |
| 16 | } |
| 17 | |
| 18 | type A struct{} |
| 19 | |
| 20 | func (a A) Foo() {} |
| 21 | func (a A) Bar() {} |
| 22 | |
| 23 | type B struct { |
| 24 | a A |
| 25 | i I |
| 26 | } |
| 27 | |
| 28 | func Do() B { |
| 29 | b := B{} |
| 30 | return b |
| 31 | } |
| 32 | |
| 33 | func Baz(b B) { |
| 34 | var j J |
| 35 | j = b.a |
| 36 | |
| 37 | j.Bar() |
| 38 | |
| 39 | b.i = j |
| 40 | |
| 41 | Do().i.Foo() |
| 42 | } |
| 43 | |
| 44 | // Relevant SSA: |
| 45 | // func Baz(b B): |
| 46 | // t0 = local B (b) |
| 47 | // *t0 = b |
| 48 | // t1 = &t0.a [#0] // no flow here since a is of concrete type |
| 49 | // t2 = *t1 |
| 50 | // t3 = make J <- A (t2) |
| 51 | // t4 = invoke t3.Bar() |
| 52 | // t5 = &t0.i [#1] |
| 53 | // t6 = change interface I <- J (t3) |
| 54 | // *t5 = t6 |
| 55 | // t7 = Do() |
| 56 | // t8 = t7.i [#0] |
| 57 | // t9 = (A).Foo(t8) |
| 58 | // return |
| 59 | |
| 60 | // WANT: |
| 61 | // Field(testdata.B:i) -> Local(t5), Local(t8) |
| 62 | // Local(t5) -> Field(testdata.B:i) |
| 63 | // Local(t2) -> Local(t3) |
| 64 | // Local(t3) -> Local(t6) |
| 65 | // Local(t6) -> Local(t5) |
| 66 |