| 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 Doer func() |
| 10 | |
| 11 | type A struct { |
| 12 | foo func() |
| 13 | do Doer |
| 14 | } |
| 15 | |
| 16 | func Baz(f func()) { |
| 17 | j := &f |
| 18 | k := &j |
| 19 | **k = func() {} |
| 20 | a := A{} |
| 21 | a.foo = **k |
| 22 | a.foo() |
| 23 | a.do = a.foo |
| 24 | a.do() |
| 25 | } |
| 26 | |
| 27 | // Relevant SSA: |
| 28 | // func Baz(f func()): |
| 29 | // t0 = new func() (f) |
| 30 | // *t0 = f |
| 31 | // t1 = new *func() (j) |
| 32 | // *t1 = t0 |
| 33 | // t2 = *t1 |
| 34 | // *t2 = Baz$1 |
| 35 | // t3 = local A (a) |
| 36 | // t4 = *t1 |
| 37 | // t5 = *t4 |
| 38 | // t6 = &t3.foo [#0] |
| 39 | // *t6 = t5 |
| 40 | // t7 = &t3.foo [#0] |
| 41 | // t8 = *t7 |
| 42 | // t9 = t8() |
| 43 | // t10 = &t3.foo [#0] *func() |
| 44 | // t11 = *t10 func() |
| 45 | // t12 = &t3.do [#1] *Doer |
| 46 | // t13 = changetype Doer <- func() (t11) Doer |
| 47 | // *t12 = t13 |
| 48 | // t14 = &t3.do [#1] *Doer |
| 49 | // t15 = *t14 Doer |
| 50 | // t16 = t15() () |
| 51 | |
| 52 | // Flow chain showing that Baz$1 reaches t8(): |
| 53 | // Baz$1 -> t2 <-> PtrFunction(func()) <-> t4 -> t5 -> t6 <-> Field(testdata.A:foo) <-> t7 -> t8 |
| 54 | // Flow chain showing that Baz$1 reaches t15(): |
| 55 | // Field(testdata.A:foo) <-> t10 -> t11 -> t13 -> t12 <-> Field(testdata.A:do) <-> t14 -> t15 |
| 56 | |
| 57 | // WANT: |
| 58 | // Local(f) -> Local(t0) |
| 59 | // Local(t0) -> PtrFunction(func()) |
| 60 | // Function(Baz$1) -> Local(t2) |
| 61 | // PtrFunction(func()) -> Local(t0), Local(t2), Local(t4) |
| 62 | // Local(t2) -> PtrFunction(func()) |
| 63 | // Local(t6) -> Field(testdata.A:foo) |
| 64 | // Local(t4) -> Local(t5), PtrFunction(func()) |
| 65 | // Local(t5) -> Local(t6) |
| 66 | // Local(t7) -> Field(testdata.A:foo), Local(t8) |
| 67 | // Field(testdata.A:foo) -> Local(t10), Local(t6), Local(t7) |
| 68 | // Local(t6) -> Field(testdata.A:foo) |
| 69 | // Field(testdata.A:do) -> Local(t12), Local(t14) |
| 70 | // Local(t12) -> Field(testdata.A:do) |
| 71 | // Local(t10) -> Field(testdata.A:foo), Local(t11) |
| 72 | // Local(t11) -> Local(t13) |
| 73 | // Local(t13) -> Local(t12) |
| 74 | // Local(t14) -> Field(testdata.A:do), Local(t15) |
| 75 |