Calls across stack chunks perform badly

The Python stack is composed of a series of chunks of memory. These chunks are large, so we cross the boundaries infrequently and assume that it will never be on the fast path.

Unfortunately, it is possible to cross the boundary repeatedly if looping deep in the stack.

We should adjust the stack when crossing the boundary, to avoid doing so repeatedly.

Possible options include:

1. Move the caller to the new chunk, so repeated calls do not cross the boundary.
2. Instead of using a chunked stack, double the size of the stack and copy the old stack.

Both of these assume that we can move the frame. This is only possible if there are no pointers into the frame.
If a frames calls a native function taking an array of arguments, then there will be pointers into the frame.
So if we do any moving, we need to check for these pointers.

While we cannot move the frame, we can copy it, as long as the original remains. This is a bit wasteful, but shouldn't happen too often or waste too much space.

Linked PRs

• gh-145789
• gh-145828
• gh-145829
• gh-146123
• gh-148681
• gh-149097

Commencez par examiner les PRs liés gh-145789, gh-145828, gh-145829, gh-146123, gh-148681 et gh-149097, puisque l’issue ne fournit ni fichiers ni tests. Le travail est considéré comme terminé lorsqu’il évite les franchissements répétés entre les segments de pile tout en préservant la correction lorsque des appels natifs maintiennent des pointeurs vers des frames.