| 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 A struct{} |
| 10 | |
| 11 | func (a A) foo() {} |
| 12 | |
| 13 | type I interface{ foo() } |
| 14 | |
| 15 | func Baz(i I) { |
| 16 | j := &i |
| 17 | k := &j |
| 18 | **k = A{} |
| 19 | i.foo() |
| 20 | (**k).foo() |
| 21 | } |
| 22 | |
| 23 | // Relevant SSA: |
| 24 | // func Baz(i I): |
| 25 | // t0 = new I (i) |
| 26 | // *t0 = i |
| 27 | // t1 = new *I (j) |
| 28 | // *t1 = t0 |
| 29 | // t2 = *t1 |
| 30 | // t3 = local A (complit) |
| 31 | // t4 = *t3 |
| 32 | // t5 = make I <- A (t4) |
| 33 | // *t2 = t5 |
| 34 | // t6 = *t0 |
| 35 | // t7 = invoke t6.foo() |
| 36 | // t8 = *t1 |
| 37 | // t9 = *t8 |
| 38 | // t10 = invoke t9.foo() |
| 39 | |
| 40 | // Flow chain showing that A reaches i.foo(): |
| 41 | // t4 (A) -> t5 -> t2 <-> PtrInterface(I) <-> t0 -> t6 |
| 42 | // Flow chain showing that A reaches (**k).foo(): |
| 43 | // t4 (A) -> t5 -> t2 <-> PtrInterface(I) <-> t8 -> t9 |
| 44 | |
| 45 | // WANT: |
| 46 | // Local(i) -> Local(t0) |
| 47 | // Local(t0) -> Local(t6), PtrInterface(testdata.I) |
| 48 | // PtrInterface(testdata.I) -> Local(t0), Local(t2), Local(t8) |
| 49 | // Local(t2) -> PtrInterface(testdata.I) |
| 50 | // Local(t4) -> Local(t5) |
| 51 | // Local(t5) -> Local(t2) |
| 52 | // Local(t8) -> Local(t9), PtrInterface(testdata.I) |
| 53 |
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