Add tier 2 support for YIELD_VALUE

Author: markshannon

Include/internal/pycore_opcode_metadata.h

@@ -1089,32 +1089,34 @@ dummy_func(
             goto resume_frame;
         }
 
-        tier1 inst(YIELD_VALUE, (retval -- unused)) {
+        inst(YIELD_VALUE, (retval -- value)) {
             // NOTE: It's important that YIELD_VALUE never raises an exception!
             // The compiler treats any exception raised here as a failed close()
             // or throw() call.
             assert(frame != &entry_frame);
-            frame->instr_ptr = next_instr;
+            frame->instr_ptr++;
             PyGenObject *gen = _PyFrame_GetGenerator(frame);
             assert(FRAME_SUSPENDED_YIELD_FROM == FRAME_SUSPENDED + 1);
             assert(oparg == 0 || oparg == 1);
             gen->gi_frame_state = FRAME_SUSPENDED + oparg;
-            _PyFrame_SetStackPointer(frame, stack_pointer - 1);
+            SYNC_SP();
+            _PyFrame_SetStackPointer(frame, stack_pointer);
             tstate->exc_info = gen->gi_exc_state.previous_item;
             gen->gi_exc_state.previous_item = NULL;
             _Py_LeaveRecursiveCallPy(tstate);
             _PyInterpreterFrame *gen_frame = frame;
             frame = tstate->current_frame = frame->previous;
             gen_frame->previous = NULL;
-            _PyFrame_StackPush(frame, retval);
             /* We don't know which of these is relevant here, so keep them equal */
             assert(INLINE_CACHE_ENTRIES_SEND == INLINE_CACHE_ENTRIES_FOR_ITER);
             assert(_PyOpcode_Deopt[frame->instr_ptr->op.code] == SEND ||
                    _PyOpcode_Deopt[frame->instr_ptr->op.code] == FOR_ITER ||
                    _PyOpcode_Deopt[frame->instr_ptr->op.code] == INTERPRETER_EXIT ||
                    _PyOpcode_Deopt[frame->instr_ptr->op.code] == ENTER_EXECUTOR);
             LOAD_IP(1 + INLINE_CACHE_ENTRIES_SEND);
-            goto resume_frame;
+            LOAD_SP();
+            value = retval;
+            LLTRACE_RESUME_FRAME();
         }
 
         inst(POP_EXCEPT, (exc_value -- )) {

Include/internal/pycore_uop_ids.h

@@ -704,7 +704,7 @@ translate_bytecode_to_trace(
                     int nuops = expansion->nuops;
                     RESERVE(nuops + 1); /* One extra for exit */
                     int16_t last_op = expansion->uops[nuops-1].uop;
-                    if (last_op == _POP_FRAME || last_op == _RETURN_GENERATOR) {
+                    if (last_op == _POP_FRAME || last_op == _RETURN_GENERATOR || last_op == _YIELD_VALUE) {
                         // Check for trace stack underflow now:
                         // We can't bail e.g. in the middle of
                         // LOAD_CONST + _POP_FRAME.
@@ -763,7 +763,7 @@ translate_bytecode_to_trace(
                                 Py_FatalError("garbled expansion");
                         }
 
-                        if (uop == _POP_FRAME || uop == _RETURN_GENERATOR) {
+                        if (uop == _POP_FRAME || uop == _RETURN_GENERATOR || uop == _YIELD_VALUE) {
                             TRACE_STACK_POP();
                             /* Set the operand to the function or code object returned to,
                              * to assist optimization passes. (See _PUSH_FRAME below.)

Include/internal/pycore_uop_metadata.h

@@ -673,6 +673,15 @@ dummy_func(void) {
         }
     }
 
+    op(_YIELD_VALUE, (unused -- res)) {
+        OUT_OF_SPACE_IF_NULL(res = sym_new_unknown(ctx));
+    }
+
+    op(_FOR_ITER_GEN_FRAME, ( -- )) {
+        /* We are about to hit the end of the trace */
+        goto done;
+    }
+
     op(_CHECK_STACK_SPACE, ( --)) {
         assert(corresponding_check_stack == NULL);
         corresponding_check_stack = this_instr;