| 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(I) |
| 11 | } |
| 12 | |
| 13 | type A struct{} |
| 14 | |
| 15 | func (a A) foo(ai I) {} |
| 16 | |
| 17 | type B struct{} |
| 18 | |
| 19 | func (b B) foo(bi I) {} |
| 20 | |
| 21 | func doWork() I { return nil } |
| 22 | func close() I { return nil } |
| 23 | |
| 24 | func Baz(x B, h func() I, i I) I { |
| 25 | i.foo(x) |
| 26 | |
| 27 | return h() |
| 28 | } |
| 29 | |
| 30 | // Relevant SSA: |
| 31 | // func Baz(x B, h func() I, i I) I: |
| 32 | // t0 = local B (x) |
| 33 | // *t0 = x |
| 34 | // t1 = *t0 |
| 35 | // t2 = make I <- B (t1) |
| 36 | // t3 = invoke i.foo(t2) |
| 37 | // t4 = h() |
| 38 | // return t4 |
| 39 | |
| 40 | // Local(t2) has seemingly duplicates of successors. This |
| 41 | // happens in stringification of type propagation graph. |
| 42 | // Due to CHA, we analyze A.foo and *A.foo as well as B.foo |
| 43 | // and *B.foo, which have similar bodies and hence similar |
| 44 | // type flow that gets merged together during stringification. |
| 45 | |
| 46 | // WANT: |
| 47 | // Local(t2) -> Local(ai), Local(ai), Local(bi), Local(bi) |
| 48 | // Constant(testdata.I) -> Local(t4) |
| 49 | // Local(t1) -> Local(t2) |
| 50 |