py: Allow to properly disable builtin "set" object.

This patch makes MICROPY_PY_BUILTINS_SET compile-time option fully
disable the builtin set object (when set to 0).  This includes removing
set constructor/comprehension from the grammar, the compiler and the
emitters.  Now, enabling set costs 8168 bytes on unix x64, and 3576
bytes on stmhal.

py/compile.c

@@ -2761,7 +2761,7 @@ STATIC void compile_atom_brace(compiler_t *comp, mp_parse_node_struct_t *pns) {
 
                 // first element sets whether it's a dict or set
                 bool is_dict;
-                if (MP_PARSE_NODE_IS_STRUCT_KIND(pns->nodes[0], PN_dictorsetmaker_item)) {
+                if (!MICROPY_PY_BUILTINS_SET || MP_PARSE_NODE_IS_STRUCT_KIND(pns->nodes[0], PN_dictorsetmaker_item)) {
                     // a dictionary
                     EMIT_ARG(build_map, 1 + n);
                     compile_node(comp, pns->nodes[0]);
@@ -2792,13 +2792,15 @@ STATIC void compile_atom_brace(compiler_t *comp, mp_parse_node_struct_t *pns) {
                     }
                 }
 
+                #if MICROPY_PY_BUILTINS_SET
                 // if it's a set, build it
                 if (!is_dict) {
                     EMIT_ARG(build_set, 1 + n);
                 }
+                #endif
             } else if (MP_PARSE_NODE_STRUCT_KIND(pns1) == PN_comp_for) {
                 // dict/set comprehension
-                if (MP_PARSE_NODE_IS_STRUCT_KIND(pns->nodes[0], PN_dictorsetmaker_item)) {
+                if (!MICROPY_PY_BUILTINS_SET || MP_PARSE_NODE_IS_STRUCT_KIND(pns->nodes[0], PN_dictorsetmaker_item)) {
                     // a dictionary comprehension
                     compile_comprehension(comp, pns, SCOPE_DICT_COMP);
                 } else {
@@ -2816,8 +2818,12 @@ STATIC void compile_atom_brace(compiler_t *comp, mp_parse_node_struct_t *pns) {
     } else {
         // set with one element
         set_with_one_element:
+        #if MICROPY_PY_BUILTINS_SET
         compile_node(comp, pn);
         EMIT_ARG(build_set, 1);
+        #else
+        assert(0);
+        #endif
     }
 }
 
@@ -3111,8 +3117,10 @@ STATIC void compile_scope_comp_iter(compiler_t *comp, mp_parse_node_t pn_iter, m
             EMIT_ARG(list_append, for_depth + 2);
         } else if (comp->scope_cur->kind == SCOPE_DICT_COMP) {
             EMIT_ARG(map_add, for_depth + 2);
+        #if MICROPY_PY_BUILTINS_SET
         } else if (comp->scope_cur->kind == SCOPE_SET_COMP) {
             EMIT_ARG(set_add, for_depth + 2);
+        #endif
         } else {
             EMIT(yield_value);
             EMIT(pop_top);
@@ -3305,8 +3313,10 @@ STATIC void compile_scope(compiler_t *comp, scope_t *scope, pass_kind_t pass) {
             EMIT_ARG(build_list, 0);
         } else if (scope->kind == SCOPE_DICT_COMP) {
             EMIT_ARG(build_map, 0);
+        #if MICROPY_PY_BUILTINS_SET
         } else if (scope->kind == SCOPE_SET_COMP) {
             EMIT_ARG(build_set, 0);
+        #endif
         }
 
         uint l_end = comp_next_label(comp);

py/emit.h

@@ -128,8 +128,10 @@ typedef struct _emit_method_table_t {
     void (*build_map)(emit_t *emit, mp_uint_t n_args);
     void (*store_map)(emit_t *emit);
     void (*map_add)(emit_t *emit, mp_uint_t map_stack_index);
+    #if MICROPY_PY_BUILTINS_SET
     void (*build_set)(emit_t *emit, mp_uint_t n_args);
     void (*set_add)(emit_t *emit, mp_uint_t set_stack_index);
+    #endif
     void (*build_slice)(emit_t *emit, mp_uint_t n_args);
     void (*unpack_sequence)(emit_t *emit, mp_uint_t n_args);
     void (*unpack_ex)(emit_t *emit, mp_uint_t n_left, mp_uint_t n_right);

py/emitbc.c

@@ -782,6 +782,7 @@ STATIC void emit_bc_map_add(emit_t *emit, mp_uint_t map_stack_index) {
     emit_write_bytecode_byte_uint(emit, MP_BC_MAP_ADD, map_stack_index);
 }
 
+#if MICROPY_PY_BUILTINS_SET
 STATIC void emit_bc_build_set(emit_t *emit, mp_uint_t n_args) {
     emit_bc_pre(emit, 1 - n_args);
     emit_write_bytecode_byte_uint(emit, MP_BC_BUILD_SET, n_args);
@@ -791,6 +792,7 @@ STATIC void emit_bc_set_add(emit_t *emit, mp_uint_t set_stack_index) {
     emit_bc_pre(emit, -1);
     emit_write_bytecode_byte_uint(emit, MP_BC_SET_ADD, set_stack_index);
 }
+#endif
 
 STATIC void emit_bc_build_slice(emit_t *emit, mp_uint_t n_args) {
     emit_bc_pre(emit, 1 - n_args);
@@ -960,8 +962,10 @@ const emit_method_table_t emit_bc_method_table = {
     emit_bc_build_map,
     emit_bc_store_map,
     emit_bc_map_add,
+    #if MICROPY_PY_BUILTINS_SET
     emit_bc_build_set,
     emit_bc_set_add,
+    #endif
     emit_bc_build_slice,
     emit_bc_unpack_sequence,
     emit_bc_unpack_ex,

py/emitnative.c

@@ -2064,6 +2064,7 @@ STATIC void emit_native_map_add(emit_t *emit, mp_uint_t map_index) {
     emit_post(emit);
 }
 
+#if MICROPY_PY_BUILTINS_SET
 STATIC void emit_native_build_set(emit_t *emit, mp_uint_t n_args) {
     emit_native_pre(emit);
     emit_get_stack_pointer_to_reg_for_pop(emit, REG_ARG_2, n_args); // pointer to items
@@ -2081,6 +2082,7 @@ STATIC void emit_native_set_add(emit_t *emit, mp_uint_t set_index) {
     emit_call(emit, MP_F_STORE_SET);
     emit_post(emit);
 }
+#endif
 
 STATIC void emit_native_build_slice(emit_t *emit, mp_uint_t n_args) {
     DEBUG_printf("build_slice %d\n", n_args);
@@ -2330,8 +2332,10 @@ const emit_method_table_t EXPORT_FUN(method_table) = {
     emit_native_build_map,
     emit_native_store_map,
     emit_native_map_add,
+    #if MICROPY_PY_BUILTINS_SET
     emit_native_build_set,
     emit_native_set_add,
+    #endif
     emit_native_build_slice,
     emit_native_unpack_sequence,
     emit_native_unpack_ex,

py/emitpass1.c

@@ -201,8 +201,10 @@ const emit_method_table_t emit_pass1_method_table = {
     (void*)emit_pass1_dummy,
     (void*)emit_pass1_dummy,
     (void*)emit_pass1_dummy,
+    #if MICROPY_PY_BUILTINS_SET
     (void*)emit_pass1_dummy,
     (void*)emit_pass1_dummy,
+    #endif
     (void*)emit_pass1_dummy,
     (void*)emit_pass1_dummy,
     (void*)emit_pass1_dummy,

py/grammar.h

@@ -287,8 +287,12 @@ DEF_RULE(exprlist_2, nc, or(2), rule(star_expr), rule(expr))
 DEF_RULE(testlist, c(generic_tuple), list_with_end, rule(test), tok(DEL_COMMA))
 // TODO dictorsetmaker lets through more than is allowed
 DEF_RULE(dictorsetmaker, nc, and(2), rule(dictorsetmaker_item), opt_rule(dictorsetmaker_tail))
+#if MICROPY_PY_BUILTINS_SET
 DEF_RULE(dictorsetmaker_item, c(dictorsetmaker_item), and(2), rule(test), opt_rule(dictorsetmaker_colon))
 DEF_RULE(dictorsetmaker_colon, nc, ident | and(2), tok(DEL_COLON), rule(test))
+#else
+DEF_RULE(dictorsetmaker_item, c(dictorsetmaker_item), and(3), rule(test), tok(DEL_COLON), rule(test))
+#endif
 DEF_RULE(dictorsetmaker_tail, nc, or(2), rule(comp_for), rule(dictorsetmaker_list))
 DEF_RULE(dictorsetmaker_list, nc, and(2), tok(DEL_COMMA), opt_rule(dictorsetmaker_list2))
 DEF_RULE(dictorsetmaker_list2, nc, list_with_end, rule(dictorsetmaker_item), tok(DEL_COMMA))

py/map.c

@@ -253,6 +253,8 @@ mp_map_elem_t* mp_map_lookup(mp_map_t *map, mp_obj_t index, mp_map_lookup_kind_t
 /******************************************************************************/
 /* set                                                                        */
 
+#if MICROPY_PY_BUILTINS_SET
+
 void mp_set_init(mp_set_t *set, mp_uint_t n) {
     set->alloc = n;
     set->used = 0;
@@ -368,6 +370,8 @@ void mp_set_clear(mp_set_t *set) {
     set->table = NULL;
 }
 
+#endif // MICROPY_PY_BUILTINS_SET
+
 #if defined(DEBUG_PRINT) && DEBUG_PRINT
 void mp_map_dump(mp_map_t *map) {
     for (mp_uint_t i = 0; i < map->alloc; i++) {

py/modbuiltins.c

@@ -583,7 +583,7 @@ STATIC const mp_map_elem_t mp_module_builtins_globals_table[] = {
 #if MICROPY_PY_BUILTINS_FLOAT
     { MP_OBJ_NEW_QSTR(MP_QSTR_float), (mp_obj_t)&mp_type_float },
 #endif
-#if MICROPY_PY_BUILTINS_FROZENSET
+#if MICROPY_PY_BUILTINS_SET && MICROPY_PY_BUILTINS_FROZENSET
     { MP_OBJ_NEW_QSTR(MP_QSTR_frozenset), (mp_obj_t)&mp_type_frozenset },
 #endif
     { MP_OBJ_NEW_QSTR(MP_QSTR_int), (mp_obj_t)&mp_type_int },

py/vmentrytable.h

@@ -86,8 +86,10 @@ static void* entry_table[256] = {
     [MP_BC_BUILD_MAP] = &&entry_MP_BC_BUILD_MAP,
     [MP_BC_STORE_MAP] = &&entry_MP_BC_STORE_MAP,
     [MP_BC_MAP_ADD] = &&entry_MP_BC_MAP_ADD,
+    #if MICROPY_PY_BUILTINS_SET
     [MP_BC_BUILD_SET] = &&entry_MP_BC_BUILD_SET,
     [MP_BC_SET_ADD] = &&entry_MP_BC_SET_ADD,
+    #endif
     [MP_BC_BUILD_SLICE] = &&entry_MP_BC_BUILD_SLICE,
     [MP_BC_UNPACK_SEQUENCE] = &&entry_MP_BC_UNPACK_SEQUENCE,
     [MP_BC_UNPACK_EX] = &&entry_MP_BC_UNPACK_EX,

unix/qstrdefsport.h

@@ -48,6 +48,8 @@ Q(as_bytearray)
 Q(callback)
 Q(func)
 Q(var)
+Q(get)
+Q(set)
 
 Q(input)
 Q(utime)