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bpo-45963: Make space for the InterpreterFrame of a generator in that generator. (GH-29891)

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* Make generator, coroutine and async gen structs all the same size.

* Store interpreter frame in generator (and coroutine). Reduces the number of allocations neeeded for a generator from two to one.
This commit is contained in:
Mark Shannon 2021-12-06 10:13:49 +00:00 • committed by GitHub
parent f34d181fa1
commit 299483c95d
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GPG key ID: 4AEE18F83AFDEB23
7 changed files with 128 additions and 145 deletions
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18
Python/frame.c
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@ -43,18 +43,12 @@ _PyFrame_MakeAndSetFrameObject(InterpreterFrame *frame)
return f;
}
InterpreterFrame *
_PyFrame_Copy(InterpreterFrame *frame)
void
_PyFrame_Copy(InterpreterFrame *src, InterpreterFrame *dest)
{
assert(frame->stacktop >= frame->f_code->co_nlocalsplus);
Py_ssize_t size = ((char*)&frame->localsplus[frame->stacktop]) - (char *)frame;
InterpreterFrame *copy = PyMem_Malloc(size);
if (copy == NULL) {
PyErr_NoMemory();
return NULL;
}
memcpy(copy, frame, size);
return copy;
assert(src->stacktop >= src->f_code->co_nlocalsplus);
Py_ssize_t size = ((char*)&src->localsplus[src->stacktop]) - (char *)src;
memcpy(dest, src, size);
}
static inline void
@ -112,7 +106,7 @@ _PyFrame_Clear(InterpreterFrame * frame)
}
Py_DECREF(f);
}
assert(_PyFrame_GetStackPointer(frame) >= _PyFrame_Stackbase(frame));
assert(frame->stacktop >= 0);
for (int i = 0; i < frame->stacktop; i++) {
Py_XDECREF(frame->localsplus[i]);
}