[3.13] gh-119258: Backport optimizer frame fixes in GH-119365 (GH-120699)

(cherry picked from commit 55402d3)

Include/internal/pycore_optimizer.h

@@ -107,9 +107,9 @@ extern void _Py_uop_abstractcontext_fini(_Py_UOpsContext *ctx);
 extern _Py_UOpsAbstractFrame *_Py_uop_frame_new(
     _Py_UOpsContext *ctx,
     PyCodeObject *co,
-    _Py_UopsSymbol **localsplus_start,
+    int curr_stackentries,
-    int n_locals_already_filled,
+    _Py_UopsSymbol **args,
-    int curr_stackentries);
+    int arg_len);
 extern int _Py_uop_frame_pop(_Py_UOpsContext *ctx);
 
 PyAPI_FUNC(PyObject *) _Py_uop_symbols_test(PyObject *self, PyObject *ignored);

Python/optimizer_analysis.c

@@ -411,7 +411,7 @@ optimize_uops(
     if (_Py_uop_abstractcontext_init(ctx) < 0) {
         goto out_of_space;
     }
-    _Py_UOpsAbstractFrame *frame = _Py_uop_frame_new(ctx, co, ctx->n_consumed, 0, curr_stacklen);
+    _Py_UOpsAbstractFrame *frame = _Py_uop_frame_new(ctx, co, curr_stacklen, NULL, 0);
     if (frame == NULL) {
         return -1;
     }

Python/optimizer_bytecodes.c

@@ -616,17 +616,12 @@ dummy_func(void) {
             argcount++;
         }
 
-        _Py_UopsSymbol **localsplus_start = ctx->n_consumed;
+
-        int n_locals_already_filled = 0;
-        // Can determine statically, so we interleave the new locals
-        // and make the current stack the new locals.
-        // This also sets up for true call inlining.
         if (sym_is_null(self_or_null) || sym_is_not_null(self_or_null)) {
-            localsplus_start = args;
+            OUT_OF_SPACE_IF_NULL(new_frame = frame_new(ctx, co, 0, args, argcount));
-            n_locals_already_filled = argcount;
+        } else {
+            OUT_OF_SPACE_IF_NULL(new_frame = frame_new(ctx, co, 0, NULL, 0));
         }
-        OUT_OF_SPACE_IF_NULL(new_frame =
-                             frame_new(ctx, co, localsplus_start, n_locals_already_filled, 0));
     }
 
     op(_PY_FRAME_GENERAL, (callable, self_or_null, args[oparg] -- new_frame: _Py_UOpsAbstractFrame *)) {

Python/optimizer_cases.c.h

@@ -1696,17 +1696,11 @@
                 args--;
                 argcount++;
             }
-            _Py_UopsSymbol **localsplus_start = ctx->n_consumed;
-            int n_locals_already_filled = 0;
-            // Can determine statically, so we interleave the new locals
-            // and make the current stack the new locals.
-            // This also sets up for true call inlining.
             if (sym_is_null(self_or_null) || sym_is_not_null(self_or_null)) {
-                localsplus_start = args;
+                OUT_OF_SPACE_IF_NULL(new_frame = frame_new(ctx, co, 0, args, argcount));
-                n_locals_already_filled = argcount;
+            } else {
+                OUT_OF_SPACE_IF_NULL(new_frame = frame_new(ctx, co, 0, NULL, 0));
             }
-            OUT_OF_SPACE_IF_NULL(new_frame =
-                             frame_new(ctx, co, localsplus_start, n_locals_already_filled, 0));
             stack_pointer[-2 - oparg] = (_Py_UopsSymbol *)new_frame;
             stack_pointer += -1 - oparg;
             break;

Python/optimizer_symbols.c

@@ -303,9 +303,9 @@ _Py_UOpsAbstractFrame *
 _Py_uop_frame_new(
     _Py_UOpsContext *ctx,
     PyCodeObject *co,
-    _Py_UopsSymbol **localsplus_start,
+    int curr_stackentries,
-    int n_locals_already_filled,
+    _Py_UopsSymbol **args,
-    int curr_stackentries)
+    int arg_len)
 {
     assert(ctx->curr_frame_depth < MAX_ABSTRACT_FRAME_DEPTH);
     _Py_UOpsAbstractFrame *frame = &ctx->frames[ctx->curr_frame_depth];
@@ -313,21 +313,21 @@ _Py_uop_frame_new(
     frame->stack_len = co->co_stacksize;
     frame->locals_len = co->co_nlocalsplus;
 
-    frame->locals = localsplus_start;
+    frame->locals = ctx->n_consumed;
     frame->stack = frame->locals + co->co_nlocalsplus;
     frame->stack_pointer = frame->stack + curr_stackentries;
-    ctx->n_consumed = localsplus_start + (co->co_nlocalsplus + co->co_stacksize);
+    ctx->n_consumed = ctx->n_consumed + (co->co_nlocalsplus + co->co_stacksize);
     if (ctx->n_consumed >= ctx->limit) {
         return NULL;
     }
 
-
     // Initialize with the initial state of all local variables
-    for (int i = n_locals_already_filled; i < co->co_nlocalsplus; i++) {
+    for (int i = 0; i < arg_len; i++) {
-        _Py_UopsSymbol *local = _Py_uop_sym_new_unknown(ctx);
+        frame->locals[i] = args[i];
-        if (local == NULL) {
-            return NULL;
     }
+
+    for (int i = arg_len; i < co->co_nlocalsplus; i++) {
+        _Py_UopsSymbol *local = _Py_uop_sym_new_unknown(ctx);
         frame->locals[i] = local;
     }
 
@@ -335,9 +335,6 @@ _Py_uop_frame_new(
     // Initialize the stack as well
     for (int i = 0; i < curr_stackentries; i++) {
         _Py_UopsSymbol *stackvar = _Py_uop_sym_new_unknown(ctx);
-        if (stackvar == NULL) {
-            return NULL;
-        }
         frame->stack[i] = stackvar;
     }