py: Implement calling functions with *args in native emitter.

py/emitnative.c

@@ -184,6 +184,7 @@ STATIC byte mp_f_n_args[MP_F_NUMBER_OF] = {
     [MP_F_MAKE_FUNCTION_FROM_RAW_CODE] = 3,
     [MP_F_NATIVE_CALL_FUNCTION_N_KW] = 3,
     [MP_F_CALL_METHOD_N_KW] = 3,
+    [MP_F_CALL_METHOD_N_KW_VAR] = 3,
     [MP_F_GETITER] = 1,
     [MP_F_ITERNEXT] = 1,
     [MP_F_NLR_PUSH] = 1,
@@ -2189,13 +2190,12 @@ STATIC void emit_native_call_function(emit_t *emit, mp_uint_t n_positional, mp_u
     // TODO: in viper mode, call special runtime routine with type info for args,
     // and wanted type info for return, to remove need for boxing/unboxing
 
-    assert(!star_flags);
-
     emit_native_pre(emit);
     vtype_kind_t vtype_fun = peek_vtype(emit, n_positional + 2 * n_keyword);
     if (vtype_fun == VTYPE_BUILTIN_CAST) {
         // casting operator
         assert(n_positional == 1 && n_keyword == 0);
+        assert(!star_flags);
         DEBUG_printf("  cast to %d\n", vtype_fun);
         vtype_kind_t vtype_cast = peek_stack(emit, 1)->data.u_imm;
         switch (peek_vtype(emit, 0)) {
@@ -2221,22 +2221,49 @@ STATIC void emit_native_call_function(emit_t *emit, mp_uint_t n_positional, mp_u
                 assert(!"TODO: convert obj to int");
         }
     } else {
-        if (n_positional != 0 || n_keyword != 0) {
-            emit_get_stack_pointer_to_reg_for_pop(emit, REG_ARG_3, n_positional + 2 * n_keyword); // pointer to args
-        }
-        emit_pre_pop_reg(emit, &vtype_fun, REG_ARG_1); // the function
         assert(vtype_fun == VTYPE_PYOBJ);
-        emit_call_with_imm_arg(emit, MP_F_NATIVE_CALL_FUNCTION_N_KW, n_positional | (n_keyword << 8), REG_ARG_2);
-        emit_post_push_reg(emit, VTYPE_PYOBJ, REG_RET);
+        if (star_flags) {
+            if (!(star_flags & MP_EMIT_STAR_FLAG_SINGLE)) {
+                // load dummy entry for non-existent pos_seq
+                emit_native_load_null(emit);
+                emit_native_rot_two(emit);
+            } else if (!(star_flags & MP_EMIT_STAR_FLAG_DOUBLE)) {
+                // load dummy entry for non-existent kw_dict
+                emit_native_load_null(emit);
+            }
+            emit_get_stack_pointer_to_reg_for_pop(emit, REG_ARG_3, n_positional + 2 * n_keyword + 3); // pointer to args
+            emit_call_with_2_imm_args(emit, MP_F_CALL_METHOD_N_KW_VAR, 0, REG_ARG_1, n_positional | (n_keyword << 8), REG_ARG_2);
+            emit_post_push_reg(emit, VTYPE_PYOBJ, REG_RET);
+        } else {
+            if (n_positional != 0 || n_keyword != 0) {
+                emit_get_stack_pointer_to_reg_for_pop(emit, REG_ARG_3, n_positional + 2 * n_keyword); // pointer to args
+            }
+            emit_pre_pop_reg(emit, &vtype_fun, REG_ARG_1); // the function
+            emit_call_with_imm_arg(emit, MP_F_NATIVE_CALL_FUNCTION_N_KW, n_positional | (n_keyword << 8), REG_ARG_2);
+            emit_post_push_reg(emit, VTYPE_PYOBJ, REG_RET);
+        }
     }
 }
 
 STATIC void emit_native_call_method(emit_t *emit, mp_uint_t n_positional, mp_uint_t n_keyword, mp_uint_t star_flags) {
-    assert(!star_flags);
-    emit_native_pre(emit);
-    emit_get_stack_pointer_to_reg_for_pop(emit, REG_ARG_3, 2 + n_positional + 2 * n_keyword); // pointer to items, including meth and self
-    emit_call_with_2_imm_args(emit, MP_F_CALL_METHOD_N_KW, n_positional, REG_ARG_1, n_keyword, REG_ARG_2);
-    emit_post_push_reg(emit, VTYPE_PYOBJ, REG_RET);
+    if (star_flags) {
+        if (!(star_flags & MP_EMIT_STAR_FLAG_SINGLE)) {
+            // load dummy entry for non-existent pos_seq
+            emit_native_load_null(emit);
+            emit_native_rot_two(emit);
+        } else if (!(star_flags & MP_EMIT_STAR_FLAG_DOUBLE)) {
+            // load dummy entry for non-existent kw_dict
+            emit_native_load_null(emit);
+        }
+        emit_get_stack_pointer_to_reg_for_pop(emit, REG_ARG_3, n_positional + 2 * n_keyword + 4); // pointer to args
+        emit_call_with_2_imm_args(emit, MP_F_CALL_METHOD_N_KW_VAR, 1, REG_ARG_1, n_positional | (n_keyword << 8), REG_ARG_2);
+        emit_post_push_reg(emit, VTYPE_PYOBJ, REG_RET);
+    } else {
+        emit_native_pre(emit);
+        emit_get_stack_pointer_to_reg_for_pop(emit, REG_ARG_3, 2 + n_positional + 2 * n_keyword); // pointer to items, including meth and self
+        emit_call_with_2_imm_args(emit, MP_F_CALL_METHOD_N_KW, n_positional, REG_ARG_1, n_keyword, REG_ARG_2);
+        emit_post_push_reg(emit, VTYPE_PYOBJ, REG_RET);
+    }
 }
 
 STATIC void emit_native_return_value(emit_t *emit) {

py/nativeglue.c

@@ -117,6 +117,7 @@ void *const mp_fun_table[MP_F_NUMBER_OF] = {
     mp_make_function_from_raw_code,
     mp_native_call_function_n_kw,
     mp_call_method_n_kw,
+    mp_call_method_n_kw_var,
     mp_getiter,
     mp_iternext,
     nlr_push,

py/runtime0.h

@@ -133,6 +133,7 @@ typedef enum {
     MP_F_MAKE_FUNCTION_FROM_RAW_CODE,
     MP_F_NATIVE_CALL_FUNCTION_N_KW,
     MP_F_CALL_METHOD_N_KW,
+    MP_F_CALL_METHOD_N_KW_VAR,
     MP_F_GETITER,
     MP_F_ITERNEXT,
     MP_F_NLR_PUSH,

tests/run-tests

@@ -160,7 +160,6 @@ def run_tests(pyb, tests, args):
         skip_tests.add('basics/boundmeth1.py') # requires support for many args
         skip_tests.add('basics/closure_manyvars.py') # requires closures
         skip_tests.add('float/string_format.py')
-        skip_tests.add('float/cmath_fun.py') # requires f(*args) support
         skip_tests.add('import/gen_context.py')
         skip_tests.add('io/file_with.py')
         skip_tests.add('io/stringio_with.py')