24b9ef1a73
When passing pointers of Go objects from Go to C, the cgo command generate _Cgo_use(pN) for the unsafe.Pointer type arguments, so that the Go compiler will escape these object to heap.
Since the C function may callback to Go, then the Go stack might grow/shrink, that means the pointers that the C function have will be invalid.
After adding the #cgo noescape annotation for a C function, the cgo command won't generate _Cgo_use(pN), and the Go compiler won't force the object escape to heap.
After adding the #cgo nocallback annotation for a C function, which means the C function won't callback to Go, if it do callback to Go, the Go process will crash.
Fixes #56378
Change-Id: Ifdca070584e0d349c7b12276270e50089e481f7a
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