Address review

Include/internal/pycore_frame.h

@@ -75,9 +75,11 @@ typedef struct _PyInterpreterFrame {
     _PyStackRef *stackpointer;
     uint16_t return_offset;  /* Only relevant during a function call */
     char owner;
-    char visited;
 #ifdef Py_DEBUG
-    unsigned char lltrace;
+    char visited:4;
+    char lltrace:4;
+#else
+    char visited;
 #endif
     /* Locals and stack */
     _PyStackRef localsplus[1];

Lib/test/test_sys.py

@@ -1620,11 +1620,10 @@ class C(object): pass
         def func():
             return sys._getframe()
         x = func()
-        LLTRACE = 'B' if support.Py_DEBUG else ''
         if support.Py_GIL_DISABLED:
-            INTERPRETER_FRAME = f'10Phcc{LLTRACE}P'
+            INTERPRETER_FRAME = f'10PhcP'
         else:
-            INTERPRETER_FRAME = f'9Phcc{LLTRACE}P'
+            INTERPRETER_FRAME = f'9PhcP'
         check(x, size('3PiccPP' + INTERPRETER_FRAME + 'P'))
         # function
         def func(): pass

Python/bytecodes.c

@@ -4993,7 +4993,7 @@ dummy_func(
             _Py_CODEUNIT *target = _PyFrame_GetBytecode(frame) + exit->target;
         #if defined(Py_DEBUG) && !defined(_Py_JIT)
             OPT_HIST(trace_uop_execution_counter, trace_run_length_hist);
-            if (FT_ATOMIC_LOAD_UINT8_RELAXED(frame->lltrace) >= 2) {
+            if (frame->lltrace >= 2) {
                 printf("SIDE EXIT: [UOp ");
                 _PyUOpPrint(&next_uop[-1]);
                 printf(", exit %u, temp %d, target %d -> %s]\n",
@@ -5111,7 +5111,7 @@ dummy_func(
             _Py_CODEUNIT *target = frame->instr_ptr;
         #if defined(Py_DEBUG) && !defined(_Py_JIT)
             OPT_HIST(trace_uop_execution_counter, trace_run_length_hist);
-            if (FT_ATOMIC_LOAD_UINT8_RELAXED(frame->lltrace) >= 2) {
+            if (frame->lltrace >= 2) {
                 printf("DYNAMIC EXIT: [UOp ");
                 _PyUOpPrint(&next_uop[-1]);
                 printf(", exit %u, temp %d, target %d -> %s]\n",

Python/ceval.c

@@ -1006,7 +1006,7 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int
             }
             /* Resume normal execution */
 #ifdef LLTRACE
-            if (FT_ATOMIC_LOAD_UINT8_RELAXED(frame->lltrace) >= 5) {
+            if (frame->lltrace >= 5) {
                 lltrace_resume_frame(frame);
             }
 #endif
@@ -1083,7 +1083,7 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int
     for (;;) {
         uopcode = next_uop->opcode;
 #ifdef Py_DEBUG
-        if (FT_ATOMIC_LOAD_UINT8_RELAXED(frame->lltrace) >= 3) {
+        if (frame->lltrace >= 3) {
             dump_stack(frame, stack_pointer);
             if (next_uop->opcode == _START_EXECUTOR) {
                 printf("%4d uop: ", 0);
@@ -1125,7 +1125,7 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int
 
 jump_to_error_target:
 #ifdef Py_DEBUG
-    if (FT_ATOMIC_LOAD_UINT8_RELAXED(frame->lltrace) >= 2) {
+    if (frame->lltrace >= 2) {
         printf("Error: [UOp ");
         _PyUOpPrint(&next_uop[-1]);
         printf(" @ %d -> %s]\n",
@@ -1161,7 +1161,7 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int
     next_instr = next_uop[-1].target + _PyFrame_GetBytecode(frame);
 goto_to_tier1:
 #ifdef Py_DEBUG
-    if (FT_ATOMIC_LOAD_UINT8_RELAXED(frame->lltrace) >= 2) {
+    if (frame->lltrace >= 2) {
         printf("DEOPT: [UOp ");
         _PyUOpPrint(&next_uop[-1]);
         printf(" -> %s]\n",

Python/ceval_macros.h

@@ -80,7 +80,7 @@
 
 /* PRE_DISPATCH_GOTO() does lltrace if enabled. Normally a no-op */
 #ifdef LLTRACE
-#define PRE_DISPATCH_GOTO() if (FT_ATOMIC_LOAD_UINT8_RELAXED(frame->lltrace) >= 5) { \
+#define PRE_DISPATCH_GOTO() if (frame->lltrace >= 5) { \
     lltrace_instruction(frame, stack_pointer, next_instr, opcode, oparg); }
 #else
 #define PRE_DISPATCH_GOTO() ((void)0)