| // Copyright 2021 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // go:build ignore |
| |
| package testdata |
| |
| type Doer func() |
| |
| type A struct { |
| foo func() |
| do Doer |
| } |
| |
| func Baz(f func()) { |
| j := &f |
| k := &j |
| **k = func() {} |
| a := A{} |
| a.foo = **k |
| a.foo() |
| a.do = a.foo |
| a.do() |
| } |
| |
| // Relevant SSA: |
| // func Baz(f func()): |
| // t0 = new func() (f) |
| // *t0 = f |
| // t1 = new *func() (j) |
| // *t1 = t0 |
| // t2 = *t1 |
| // *t2 = Baz$1 |
| // t3 = local A (a) |
| // t4 = &t3.foo [#0] |
| // t5 = *t1 |
| // t6 = *t5 |
| // *t4 = t6 |
| // t7 = &t3.foo [#0] |
| // t8 = *t7 |
| // t9 = t8() |
| // t10 = &t3.do [#1] *Doer |
| // t11 = &t3.foo [#0] *func() |
| // t12 = *t11 func() |
| // t13 = changetype Doer <- func() (t12) Doer |
| // *t10 = t13 |
| // t14 = &t3.do [#1] *Doer |
| // t15 = *t14 Doer |
| // t16 = t15() () |
| |
| // Flow chain showing that Baz$1 reaches t8(): |
| // Baz$1 -> t2 <-> PtrFunction(func()) <-> t5 -> t6 -> t4 <-> Field(testdata.A:foo) <-> t7 -> t8 |
| // Flow chain showing that Baz$1 reaches t15(): |
| // Field(testdata.A:foo) <-> t11 -> t12 -> t13 -> t10 <-> Field(testdata.A:do) <-> t14 -> t15 |
| |
| // WANT: |
| // Local(f) -> Local(t0) |
| // Local(t0) -> PtrFunction(func()) |
| // Function(Baz$1) -> Local(t2) |
| // PtrFunction(func()) -> Local(t0), Local(t2), Local(t5) |
| // Local(t2) -> PtrFunction(func()) |
| // Local(t4) -> Field(testdata.A:foo) |
| // Local(t5) -> Local(t6), PtrFunction(func()) |
| // Local(t6) -> Local(t4) |
| // Local(t7) -> Field(testdata.A:foo), Local(t8) |
| // Field(testdata.A:foo) -> Local(t11), Local(t4), Local(t7) |
| // Local(t4) -> Field(testdata.A:foo) |
| // Field(testdata.A:do) -> Local(t10), Local(t14) |
| // Local(t10) -> Field(testdata.A:do) |
| // Local(t11) -> Field(testdata.A:foo), Local(t12) |
| // Local(t12) -> Local(t13) |
| // Local(t13) -> Local(t10) |
| // Local(t14) -> Field(testdata.A:do), Local(t15) |
