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py: Change compile order for default positional and keyword args.

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This simplifies the compiler a little, since now it can do 1 pass over
a function declaration, to determine default arguments.  I would have
done this originally, but CPython 3.3 somehow had the default keyword
args compiled before the default position args (even though they appear
in the other order in the text of the script), and I thought it was
important to have the same order of execution when evaluating default
arguments.  CPython 3.4 has changed the order to the more obvious one,
so we can also change.
This commit is contained in:
Damien George 2014-04-11 13:38:30 +00:00
parent 0e3329a6b8
commit 69b89d21b2
5 changed files with 37 additions and 50 deletions
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69
py/compile.c
View file

@ -53,9 +53,8 @@ typedef struct _compiler_t {
uint16_t n_arg_keyword;
uint8_t star_flags;
uint8_t have_bare_star;
uint8_t param_pass;
uint16_t param_pass_num_dict_params;
uint16_t param_pass_num_default_params;
uint16_t num_dict_params;
uint16_t num_default_params;
scope_t *scope_head;
scope_t *scope_cur;
@ -897,7 +896,7 @@ void compile_funcdef_param(compiler_t *comp, mp_parse_node_t pn) {
// this parameter does not have a default value
// check for non-default parameters given after default parameters (allowed by parser, but not syntactically valid)
if (!comp->have_bare_star && comp->param_pass_num_default_params != 0) {
if (!comp->have_bare_star && comp->num_default_params != 0) {
compile_syntax_error(comp, pn, "non-default argument follows default argument");
return;
}
@ -907,27 +906,23 @@ void compile_funcdef_param(compiler_t *comp, mp_parse_node_t pn) {
// in CPython, None (and True, False?) as default parameters are loaded with LOAD_NAME; don't understandy why
if (comp->have_bare_star) {
comp->param_pass_num_dict_params += 1;
if (comp->param_pass == 1) {
comp->num_dict_params += 1;
#if !MICROPY_EMIT_CPYTHON
// in Micro Python we put the default dict parameters into a dictionary using the bytecode
if (comp->param_pass_num_dict_params == 1) {
// first default dict param, so make the map
EMIT_ARG(build_map, 0);
}
#endif
EMIT_ARG(load_const_id, MP_PARSE_NODE_LEAF_ARG(pn_id));
compile_node(comp, pn_equal);
#if !MICROPY_EMIT_CPYTHON
// in Micro Python we put the default dict parameters into a dictionary using the bytecode
EMIT(store_map);
#endif
// in Micro Python we put the default dict parameters into a dictionary using the bytecode
if (comp->num_dict_params == 1) {
// first default dict param, so make the map
EMIT_ARG(build_map, 0);
}
#endif
EMIT_ARG(load_const_id, MP_PARSE_NODE_LEAF_ARG(pn_id));
compile_node(comp, pn_equal);
#if !MICROPY_EMIT_CPYTHON
// in Micro Python we put the default dict parameters into a dictionary using the bytecode
EMIT(store_map);
#endif
} else {
comp->param_pass_num_default_params += 1;
if (comp->param_pass == 2) {
compile_node(comp, pn_equal);
}
comp->num_default_params += 1;
compile_node(comp, pn_equal);
}
}
@ -948,34 +943,23 @@ qstr compile_funcdef_helper(compiler_t *comp, mp_parse_node_struct_t *pns, uint
// save variables (probably don't need to do this, since we can't have nested definitions..?)
uint old_have_bare_star = comp->have_bare_star;
uint old_param_pass = comp->param_pass;
uint old_param_pass_num_dict_params = comp->param_pass_num_dict_params;
uint old_param_pass_num_default_params = comp->param_pass_num_default_params;
uint old_num_dict_params = comp->num_dict_params;
uint old_num_default_params = comp->num_default_params;
// compile default parameters
// pass 1 does any default parameters after bare star
comp->have_bare_star = false;
comp->param_pass = 1;
comp->param_pass_num_dict_params = 0;
comp->param_pass_num_default_params = 0;
comp->num_dict_params = 0;
comp->num_default_params = 0;
apply_to_single_or_list(comp, pns->nodes[1], PN_typedargslist, compile_funcdef_param);
if (comp->had_error) {
return MP_QSTR_NULL;
}
// pass 2 does any default parameters before bare star
comp->have_bare_star = false;
comp->param_pass = 2;
comp->param_pass_num_dict_params = 0;
comp->param_pass_num_default_params = 0;
apply_to_single_or_list(comp, pns->nodes[1], PN_typedargslist, compile_funcdef_param);
#if !MICROPY_EMIT_CPYTHON
// in Micro Python we put the default positional parameters into a tuple using the bytecode
if (comp->param_pass_num_default_params > 0) {
EMIT_ARG(build_tuple, comp->param_pass_num_default_params);
if (comp->num_default_params > 0) {
EMIT_ARG(build_tuple, comp->num_default_params);
}
#endif
@ -983,13 +967,12 @@ qstr compile_funcdef_helper(compiler_t *comp, mp_parse_node_struct_t *pns, uint
scope_t *fscope = (scope_t*)pns->nodes[4];
// make the function
close_over_variables_etc(comp, fscope, comp->param_pass_num_default_params, comp->param_pass_num_dict_params);
close_over_variables_etc(comp, fscope, comp->num_default_params, comp->num_dict_params);
// restore variables
comp->have_bare_star = old_have_bare_star;
comp->param_pass = old_param_pass;
comp->param_pass_num_dict_params = old_param_pass_num_dict_params;
comp->param_pass_num_default_params = old_param_pass_num_default_params;
comp->num_dict_params = old_num_dict_params;
comp->num_default_params = old_num_default_params;
// return its name (the 'f' in "def f(...):")
return fscope->simple_name;

6
py/emitbc.c
View file

@ -744,10 +744,10 @@ STATIC void emit_bc_make_function(emit_t *emit, scope_t *scope, uint n_pos_defau
if (n_pos_defaults == 0) {
// load dummy entry for non-existent positional default tuple
emit_bc_load_null(emit);
emit_bc_rot_two(emit);
} else if (n_kw_defaults == 0) {
// load dummy entry for non-existent keyword default dict
emit_bc_load_null(emit);
emit_bc_rot_two(emit);
}
emit_bc_pre(emit, -1);
emit_write_byte_code_byte_uint(emit, MP_BC_MAKE_FUNCTION_DEFARGS, scope->unique_code_id);
@ -762,11 +762,11 @@ STATIC void emit_bc_make_closure(emit_t *emit, scope_t *scope, uint n_pos_defaul
if (n_pos_defaults == 0) {
// load dummy entry for non-existent positional default tuple
emit_bc_load_null(emit);
emit_bc_rot_two(emit);
emit_bc_rot_three(emit);
} else if (n_kw_defaults == 0) {
// load dummy entry for non-existent keyword default dict
emit_bc_load_null(emit);
emit_bc_rot_three(emit);
emit_bc_rot_two(emit);
}
emit_bc_pre(emit, -2);
emit_write_byte_code_byte_uint(emit, MP_BC_MAKE_CLOSURE_DEFARGS, scope->unique_code_id);

3
py/emitglue.c
View file

@ -197,6 +197,9 @@ mp_obj_t mp_make_function_from_id(uint unique_code_id, mp_obj_t def_args, mp_obj
return mp_const_none;
}
// def_args must be MP_OBJ_NULL or a tuple
assert(def_args == MP_OBJ_NULL || MP_OBJ_IS_TYPE(def_args, &mp_type_tuple));
// TODO implement default kw args
assert(def_kw_args == MP_OBJ_NULL);

1
py/objfun.c
View file

@ -361,6 +361,7 @@ mp_obj_t mp_obj_new_fun_bc(uint scope_flags, qstr *args, uint n_args, mp_obj_t d
uint n_extra_args = 0;
mp_obj_tuple_t *def_args = def_args_in;
if (def_args != MP_OBJ_NULL) {
assert(MP_OBJ_IS_TYPE(def_args, &mp_type_tuple));
n_def_args = def_args->len;
n_extra_args = def_args->len;
}

8
py/vm.c
View file

@ -718,9 +718,9 @@ unwind_jump:
case MP_BC_MAKE_FUNCTION_DEFARGS:
DECODE_UINT;
// Stack layout: def_dict def_tuple <- TOS
// Stack layout: def_tuple def_dict <- TOS
obj1 = POP();
SET_TOP(mp_make_function_from_id(unum, obj1, TOP()));
SET_TOP(mp_make_function_from_id(unum, TOP(), obj1));
break;
case MP_BC_MAKE_CLOSURE:
@ -731,10 +731,10 @@ unwind_jump:
case MP_BC_MAKE_CLOSURE_DEFARGS:
DECODE_UINT;
// Stack layout: def_dict def_tuple closure_tuple <- TOS
// Stack layout: def_tuple def_dict closure_tuple <- TOS
obj1 = POP();
obj2 = POP();
SET_TOP(mp_make_closure_from_id(unum, obj1, obj2, TOP()));
SET_TOP(mp_make_closure_from_id(unum, obj1, TOP(), obj2));
break;
case MP_BC_CALL_FUNCTION: