90 lines
2.1 KiB
Go
90 lines
2.1 KiB
Go
package main
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import "runtime"
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func final1a(x *int) int {
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print(x) // @pointsto new@newint:10
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return *x
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}
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func final1b(x *bool) {
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print(x) // @pointsto
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}
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func runtimeSetFinalizer1() {
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x := new(int) // @line newint
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runtime.SetFinalizer(x, final1a) // ok: final1a's result is ignored
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runtime.SetFinalizer(x, final1b) // param type mismatch: no effect
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}
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// @calls main.runtimeSetFinalizer1 -> main.final1a
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// @calls main.runtimeSetFinalizer1 -> main.final1b
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func final2a(x *bool) {
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print(x) // @pointsto new@newbool1:10 | new@newbool2:10
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}
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func final2b(x *bool) {
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print(x) // @pointsto new@newbool1:10 | new@newbool2:10
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}
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func runtimeSetFinalizer2() {
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x := new(bool) // @line newbool1
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f := final2a
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if unknown {
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x = new(bool) // @line newbool2
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f = final2b
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}
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runtime.SetFinalizer(x, f)
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}
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// @calls main.runtimeSetFinalizer2 -> main.final2a
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// @calls main.runtimeSetFinalizer2 -> main.final2b
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type T int
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func (t *T) finalize() {
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print(t) // @pointsto new@final3:10
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}
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func runtimeSetFinalizer3() {
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x := new(T) // @line final3
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runtime.SetFinalizer(x, (*T).finalize)
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}
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// @calls main.runtimeSetFinalizer3 -> (*main.T).finalize$thunk
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// I hope I never live to see this code in the wild.
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var setFinalizer = runtime.SetFinalizer
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func final4(x *int) {
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print(x) // @pointsto new@finalIndirect:10
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}
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func runtimeSetFinalizerIndirect() {
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// In an indirect call, the shared contour for SetFinalizer is
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// used, i.e. the call is not inlined and appears in the call graph.
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x := new(int) // @line finalIndirect
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setFinalizer(x, final4)
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}
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// Exercise the elimination of SetFinalizer
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// constraints with non-pointer operands.
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func runtimeSetFinalizerNonpointer() {
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runtime.SetFinalizer(nil, (*T).finalize) // x is a non-pointer
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runtime.SetFinalizer((*T).finalize, nil) // f is a non-pointer
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}
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// @calls main.runtimeSetFinalizerIndirect -> runtime.SetFinalizer
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// @calls runtime.SetFinalizer -> main.final4
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func main() {
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runtimeSetFinalizer1()
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runtimeSetFinalizer2()
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runtimeSetFinalizer3()
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runtimeSetFinalizerIndirect()
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runtimeSetFinalizerNonpointer()
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}
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var unknown bool // defeat dead-code elimination
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