fix a tracing bug, ifdef out code

Author: Fidget-Spinner

Python/bytecodes.c

@@ -5219,6 +5219,7 @@ dummy_func(
         }
 
         tier1 no_save_ip inst(RECORD_PREVIOUS_INST, (--)) {
+#if _Py_TIER2
             assert(IS_JIT_TRACING());
             int opcode = next_instr->op.code;
             int full = !_PyJit_translate_single_bytecode_to_trace(tstate, frame, next_instr);
@@ -5236,6 +5237,9 @@ dummy_func(
             tstate->interp->jit_state.prev_instr_oparg = oparg;
             tstate->interp->jit_state.prev_instr_stacklevel = STACK_LEVEL();
             DISPATCH_GOTO_NON_TRACING();
+#else
+            Py_FatalError("JIT instruction executed in non-jit build.");
+#endif
         }
         ///////// Tier-2 only opcodes /////////
 

Python/ceval_macros.h

@@ -413,7 +413,6 @@ _PyFrame_SetStackPointer(frame, stack_pointer)
 
 #define TIER1_TO_TIER2(EXECUTOR)                        \
 do {                                                   \
-    LEAVE_TRACING(); \
     OPT_STAT_INC(traces_executed);                     \
     next_instr = _Py_jit_entry((EXECUTOR), frame, stack_pointer, tstate); \
     frame = tstate->current_frame;                     \

Python/generated_cases.c.h

@@ -884,14 +884,17 @@ _PyJit_translate_single_bytecode_to_trace(
         ADD_TO_TRACE(_JUMP_TO_TOP, 0, 0, 0);
         goto done;
     }
+    DPRINTF(2, "Trace continuing\n");
     tstate->interp->jit_state.code_curr_size = trace_length;
     tstate->interp->jit_state.code_max_size = max_length;
     return 1;
 done:
+    DPRINTF(2, "Trace done\n");
     tstate->interp->jit_state.code_curr_size = trace_length;
     tstate->interp->jit_state.code_max_size = max_length;
     return 0;
 full:
+    DPRINTF(2, "Trace full\n");
     if (!is_terminator(&tstate->interp->jit_state.code_buffer[trace_length-1])) {
         // Undo the last few instructions.
         trace_length = tstate->interp->jit_state.code_curr_size;