bpo-44032: Move data stack to thread from FrameObject. (GH-26076)

* Remove 'zombie' frames. We won't need them once we are allocating fixed-size frames.

* Add co_nlocalplus field to code object to avoid recomputing size of locals + frees + cells.

* Move locals, cells and freevars out of frame object into separate memory buffer.

* Use per-threadstate allocated memory chunks for local variables.

* Move globals and builtins from frame object to per-thread stack.

* Move (slow) locals frame object to per-thread stack.

* Move internal frame functions to internal header.

1 files changed, 9 insertions, 0 deletions

diff --git a/Include/cpython/pystate.h b/Include/cpython/pystate.h
index e3ccc54..63ba600 100644
--- a/Include/cpython/pystate.h
+++ b/Include/cpython/pystate.h
@@ -57,6 +57,12 @@ typedef struct _err_stackitem {
 
 } _PyErr_StackItem;
 
+typedef struct _stack_chunk {
+    struct _stack_chunk *previous;
+    size_t size;
+    size_t top;
+    PyObject * data[1]; /* Variable sized */
+} _PyStackChunk;
 
 // The PyThreadState typedef is in Include/pystate.h.
 struct _ts {
@@ -149,6 +155,9 @@ struct _ts {
 
     CFrame root_cframe;
 
+    _PyStackChunk *datastack_chunk;
+    PyObject **datastack_top;
+    PyObject **datastack_limit;
     /* XXX signal handlers should also be here */
 
 };