| 1 | package main |
|---|---|
| 2 | |
| 3 | import "runtime" |
| 4 | |
| 5 | func final1a(x *int) int { |
| 6 | print(x) // @pointsto new@newint:10 |
| 7 | return *x |
| 8 | } |
| 9 | |
| 10 | func final1b(x *bool) { |
| 11 | print(x) // @pointsto |
| 12 | } |
| 13 | |
| 14 | func runtimeSetFinalizer1() { |
| 15 | x := new(int) // @line newint |
| 16 | runtime.SetFinalizer(x, final1a) // ok: final1a's result is ignored |
| 17 | runtime.SetFinalizer(x, final1b) // param type mismatch: no effect |
| 18 | } |
| 19 | |
| 20 | // @calls command-line-arguments.runtimeSetFinalizer1 -> command-line-arguments.final1a |
| 21 | // @calls command-line-arguments.runtimeSetFinalizer1 -> command-line-arguments.final1b |
| 22 | |
| 23 | func final2a(x *bool) { |
| 24 | print(x) // @pointsto new@newbool1:10 | new@newbool2:10 |
| 25 | } |
| 26 | |
| 27 | func final2b(x *bool) { |
| 28 | print(x) // @pointsto new@newbool1:10 | new@newbool2:10 |
| 29 | } |
| 30 | |
| 31 | func runtimeSetFinalizer2() { |
| 32 | x := new(bool) // @line newbool1 |
| 33 | f := final2a |
| 34 | if unknown { |
| 35 | x = new(bool) // @line newbool2 |
| 36 | f = final2b |
| 37 | } |
| 38 | runtime.SetFinalizer(x, f) |
| 39 | } |
| 40 | |
| 41 | // @calls command-line-arguments.runtimeSetFinalizer2 -> command-line-arguments.final2a |
| 42 | // @calls command-line-arguments.runtimeSetFinalizer2 -> command-line-arguments.final2b |
| 43 | |
| 44 | type T int |
| 45 | |
| 46 | func (t *T) finalize() { |
| 47 | print(t) // @pointsto new@final3:10 |
| 48 | } |
| 49 | |
| 50 | func runtimeSetFinalizer3() { |
| 51 | x := new(T) // @line final3 |
| 52 | runtime.SetFinalizer(x, (*T).finalize) |
| 53 | } |
| 54 | |
| 55 | // @calls command-line-arguments.runtimeSetFinalizer3 -> (*command-line-arguments.T).finalize$thunk |
| 56 | |
| 57 | // I hope I never live to see this code in the wild. |
| 58 | var setFinalizer = runtime.SetFinalizer |
| 59 | |
| 60 | func final4(x *int) { |
| 61 | print(x) // @pointsto new@finalIndirect:10 |
| 62 | } |
| 63 | |
| 64 | func runtimeSetFinalizerIndirect() { |
| 65 | // In an indirect call, the shared contour for SetFinalizer is |
| 66 | // used, i.e. the call is not inlined and appears in the call graph. |
| 67 | x := new(int) // @line finalIndirect |
| 68 | setFinalizer(x, final4) |
| 69 | } |
| 70 | |
| 71 | // Exercise the elimination of SetFinalizer |
| 72 | // constraints with non-pointer operands. |
| 73 | func runtimeSetFinalizerNonpointer() { |
| 74 | runtime.SetFinalizer(nil, (*T).finalize) // x is a non-pointer |
| 75 | runtime.SetFinalizer((*T).finalize, nil) // f is a non-pointer |
| 76 | } |
| 77 | |
| 78 | // @calls command-line-arguments.runtimeSetFinalizerIndirect -> runtime.SetFinalizer |
| 79 | // @calls runtime.SetFinalizer -> command-line-arguments.final4 |
| 80 | |
| 81 | func main() { |
| 82 | runtimeSetFinalizer1() |
| 83 | runtimeSetFinalizer2() |
| 84 | runtimeSetFinalizer3() |
| 85 | runtimeSetFinalizerIndirect() |
| 86 | runtimeSetFinalizerNonpointer() |
| 87 | } |
| 88 | |
| 89 | var unknown bool // defeat dead-code elimination |
| 90 |
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