py/emit: Combine yield value and yield-from emit funcs into one.

Reduces code size by:

   bare-arm:   -24
minimal x86:   -72
   unix x64:  -200
unix nanbox:   -72
      stm32:   -52
     cc3200:   -32
    esp8266:   -84
      esp32:   -24

py/compile.c

@@ -1699,7 +1699,7 @@ STATIC void compile_with_stmt(compiler_t *comp, mp_parse_node_struct_t *pns) {
 STATIC void compile_yield_from(compiler_t *comp) {
     EMIT_ARG(get_iter, false);
     EMIT_ARG(load_const_tok, MP_TOKEN_KW_NONE);
-    EMIT(yield_from);
+    EMIT_ARG(yield, MP_EMIT_YIELD_FROM);
 }
 
 #if MICROPY_PY_ASYNC_AWAIT
@@ -2621,14 +2621,14 @@ STATIC void compile_yield_expr(compiler_t *comp, mp_parse_node_struct_t *pns) {
     }
     if (MP_PARSE_NODE_IS_NULL(pns->nodes[0])) {
         EMIT_ARG(load_const_tok, MP_TOKEN_KW_NONE);
-        EMIT(yield_value);
+        EMIT_ARG(yield, MP_EMIT_YIELD_VALUE);
     } else if (MP_PARSE_NODE_IS_STRUCT_KIND(pns->nodes[0], PN_yield_arg_from)) {
         pns = (mp_parse_node_struct_t*)pns->nodes[0];
         compile_node(comp, pns->nodes[0]);
         compile_yield_from(comp);
     } else {
         compile_node(comp, pns->nodes[0]);
-        EMIT(yield_value);
+        EMIT_ARG(yield, MP_EMIT_YIELD_VALUE);
     }
 }
 
@@ -2862,7 +2862,7 @@ STATIC void compile_scope_comp_iter(compiler_t *comp, mp_parse_node_struct_t *pn
         // no more nested if/for; compile inner expression
         compile_node(comp, pn_inner_expr);
         if (comp->scope_cur->kind == SCOPE_GEN_EXPR) {
-            EMIT(yield_value);
+            EMIT_ARG(yield, MP_EMIT_YIELD_VALUE);
             EMIT(pop_top);
         } else {
             EMIT_ARG(store_comp, comp->scope_cur->kind, 4 * for_depth + 5);

py/emit.h

@@ -59,6 +59,10 @@ typedef enum {
 #define MP_EMIT_IDOP_LOCAL_FAST (0)
 #define MP_EMIT_IDOP_LOCAL_DEREF (1)
 
+// Kind for emit->yield()
+#define MP_EMIT_YIELD_VALUE (0)
+#define MP_EMIT_YIELD_FROM (1)
+
 typedef struct _emit_t emit_t;
 
 typedef struct _mp_emit_method_table_id_ops_t {
@@ -137,8 +141,7 @@ typedef struct _emit_method_table_t {
     void (*call_method)(emit_t *emit, mp_uint_t n_positional, mp_uint_t n_keyword, mp_uint_t star_flags);
     void (*return_value)(emit_t *emit);
     void (*raise_varargs)(emit_t *emit, mp_uint_t n_args);
-    void (*yield_value)(emit_t *emit);
-    void (*yield_from)(emit_t *emit);
+    void (*yield)(emit_t *emit, int kind);
 
     // these methods are used to control entry to/exit from an exception handler
     // they may or may not emit code
@@ -252,8 +255,7 @@ void mp_emit_bc_call_function(emit_t *emit, mp_uint_t n_positional, mp_uint_t n_
 void mp_emit_bc_call_method(emit_t *emit, mp_uint_t n_positional, mp_uint_t n_keyword, mp_uint_t star_flags);
 void mp_emit_bc_return_value(emit_t *emit);
 void mp_emit_bc_raise_varargs(emit_t *emit, mp_uint_t n_args);
-void mp_emit_bc_yield_value(emit_t *emit);
-void mp_emit_bc_yield_from(emit_t *emit);
+void mp_emit_bc_yield(emit_t *emit, int kind);
 void mp_emit_bc_start_except_handler(emit_t *emit);
 void mp_emit_bc_end_except_handler(emit_t *emit);
 

py/emitbc.c

@@ -931,16 +931,11 @@ void mp_emit_bc_raise_varargs(emit_t *emit, mp_uint_t n_args) {
     emit_write_bytecode_byte_byte(emit, MP_BC_RAISE_VARARGS, n_args);
 }
 
-void mp_emit_bc_yield_value(emit_t *emit) {
-    emit_bc_pre(emit, 0);
+void mp_emit_bc_yield(emit_t *emit, int kind) {
+    MP_STATIC_ASSERT(MP_BC_YIELD_VALUE + 1 == MP_BC_YIELD_FROM);
+    emit_bc_pre(emit, -kind);
     emit->scope->scope_flags |= MP_SCOPE_FLAG_GENERATOR;
-    emit_write_bytecode_byte(emit, MP_BC_YIELD_VALUE);
-}
-
-void mp_emit_bc_yield_from(emit_t *emit) {
-    emit_bc_pre(emit, -1);
-    emit->scope->scope_flags |= MP_SCOPE_FLAG_GENERATOR;
-    emit_write_bytecode_byte(emit, MP_BC_YIELD_FROM);
+    emit_write_bytecode_byte(emit, MP_BC_YIELD_VALUE + kind);
 }
 
 void mp_emit_bc_start_except_handler(emit_t *emit) {
@@ -1034,8 +1029,7 @@ const emit_method_table_t emit_bc_method_table = {
     mp_emit_bc_call_method,
     mp_emit_bc_return_value,
     mp_emit_bc_raise_varargs,
-    mp_emit_bc_yield_value,
-    mp_emit_bc_yield_from,
+    mp_emit_bc_yield,
 
     mp_emit_bc_start_except_handler,
     mp_emit_bc_end_except_handler,

py/emitnative.c

@@ -2170,16 +2170,12 @@ STATIC void emit_native_raise_varargs(emit_t *emit, mp_uint_t n_args) {
     emit_call(emit, MP_F_NATIVE_RAISE);
 }
 
-STATIC void emit_native_yield_value(emit_t *emit) {
+STATIC void emit_native_yield(emit_t *emit, int kind) {
     // not supported (for now)
     (void)emit;
+    (void)kind;
     mp_raise_NotImplementedError("native yield");
 }
-STATIC void emit_native_yield_from(emit_t *emit) {
-    // not supported (for now)
-    (void)emit;
-    mp_raise_NotImplementedError("native yield from");
-}
 
 STATIC void emit_native_start_except_handler(emit_t *emit) {
     // This instruction follows an nlr_pop, so the stack counter is back to zero, when really
@@ -2278,8 +2274,7 @@ const emit_method_table_t EXPORT_FUN(method_table) = {
     emit_native_call_method,
     emit_native_return_value,
     emit_native_raise_varargs,
-    emit_native_yield_value,
-    emit_native_yield_from,
+    emit_native_yield,
 
     emit_native_start_except_handler,
     emit_native_end_except_handler,

tests/micropython/viper_error.py.exp

@@ -20,6 +20,6 @@ ViperTypeError('unary op __neg__ not implemented',)
 ViperTypeError('unary op __invert__ not implemented',)
 ViperTypeError('binary op  not implemented',)
 NotImplementedError('native yield',)
-NotImplementedError('native yield from',)
+NotImplementedError('native yield',)
 NotImplementedError('conversion to object',)
 NotImplementedError('casting',)