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py: Slightly simplify compile and emit of star/double-star arguments. 

Saves a few bytes of code space and eliminates need for rot_two
bytecode (hence saving RAM and execution time, by a tiny bit).
This commit is contained in:
Damien George 2015-09-23 11:47:01 +01:00
parent e6978a4e26
commit fbcaf0ea18
3 changed files with 12 additions and 29 deletions
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17
py/compile.c
View File

@ -2252,11 +2252,18 @@ STATIC void compile_trailer_paren_helper(compiler_t *comp, mp_parse_node_t pn_ar
}
// compile the star/double-star arguments if we had them
if (star_args_node != NULL) {
compile_node(comp, star_args_node->nodes[0]);
}
if (dblstar_args_node != NULL) {
compile_node(comp, dblstar_args_node->nodes[0]);
// if we had one but not the other then we load "null" as a place holder
if (star_flags != 0) {
if (star_args_node == NULL) {
EMIT(load_null);
} else {
compile_node(comp, star_args_node->nodes[0]);
}
if (dblstar_args_node == NULL) {
EMIT(load_null);
} else {
compile_node(comp, dblstar_args_node->nodes[0]);
}
}
// emit the function/method call

8
py/emitbc.c
View File

@ -859,14 +859,6 @@ void mp_emit_bc_make_closure(emit_t *emit, scope_t *scope, mp_uint_t n_closed_ov
STATIC void emit_bc_call_function_method_helper(emit_t *emit, mp_int_t stack_adj, mp_uint_t bytecode_base, mp_uint_t n_positional, mp_uint_t n_keyword, mp_uint_t star_flags) {
if (star_flags) {
if (!(star_flags & MP_EMIT_STAR_FLAG_SINGLE)) {
// load dummy entry for non-existent pos_seq
mp_emit_bc_load_null(emit);
mp_emit_bc_rot_two(emit);
} else if (!(star_flags & MP_EMIT_STAR_FLAG_DOUBLE)) {
// load dummy entry for non-existent kw_dict
mp_emit_bc_load_null(emit);
}
emit_bc_pre(emit, stack_adj - (mp_int_t)n_positional - 2 * (mp_int_t)n_keyword - 2);
emit_write_bytecode_byte_uint(emit, bytecode_base + 1, (n_keyword << 8) | n_positional); // TODO make it 2 separate uints?
} else {

16
py/emitnative.c
View File

@ -2316,14 +2316,6 @@ STATIC void emit_native_call_function(emit_t *emit, mp_uint_t n_positional, mp_u
} else {
assert(vtype_fun == VTYPE_PYOBJ);
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);
@ -2340,14 +2332,6 @@ STATIC void emit_native_call_function(emit_t *emit, mp_uint_t n_positional, mp_u
STATIC void emit_native_call_method(emit_t *emit, mp_uint_t n_positional, mp_uint_t n_keyword, mp_uint_t star_flags) {
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);