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py: add skeletal import functionality.

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This commit is contained in:
Damien 2013-12-10 17:27:24 +00:00
parent 261dbf8ce5
commit db4c361f1c
5 changed files with 93 additions and 21 deletions
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6
py/bc.h
View File

@ -90,9 +90,9 @@
#define PYBC_CALL_METHOD_KW (0x98) // uint
#define PYBC_CALL_METHOD_VAR_KW (0x99) // uint
#define PYBC_IMPORT_NAME (0xe0)
#define PYBC_IMPORT_FROM (0xe1)
#define PYBC_IMPORT_STAR (0xe2)
#define PYBC_IMPORT_NAME (0xe0) // qstr
#define PYBC_IMPORT_FROM (0xe1) // qstr
#define PYBC_IMPORT_STAR (0xe2)
py_obj_t py_execute_byte_code(const byte *code, const py_obj_t *args, uint n_args, uint n_state);
bool py_execute_byte_code_2(const byte **ip_in_out, py_obj_t *fastn, py_obj_t **sp_in_out);

29
py/compile.c
View File

@ -1168,18 +1168,30 @@ void compile_import_name(compiler_t *comp, py_parse_node_struct_t *pns) {
void compile_import_from(compiler_t *comp, py_parse_node_struct_t *pns) {
if (PY_PARSE_NODE_IS_TOKEN_KIND(pns->nodes[1], PY_TOKEN_OP_STAR)) {
EMIT(load_const_small_int, 0); // what's this for??
EMIT(load_const_small_int, 0); // level 0 for __import__
// build the "fromlist" tuple
#if MICROPY_EMIT_CPYTHON
EMIT(load_const_verbatim_start);
EMIT(load_const_verbatim_str, "('*',)");
EMIT(load_const_verbatim_end);
#else
EMIT(load_const_str, qstr_from_str_static("*"), false);
EMIT(build_tuple, 1);
#endif
// do the import
qstr dummy_q, id1;
do_import_name(comp, pns->nodes[0], &dummy_q, &id1);
EMIT(import_star);
} else {
EMIT(load_const_small_int, 0); // level 0 for __import__
// build the "fromlist" tuple
py_parse_node_t *pn_nodes;
int n = list_get(&pns->nodes[1], PN_import_as_names, &pn_nodes);
EMIT(load_const_small_int, 0); // what's this for??
#if MICROPY_EMIT_CPYTHON
EMIT(load_const_verbatim_start);
EMIT(load_const_verbatim_str, "(");
for (int i = 0; i < n; i++) {
@ -1198,6 +1210,17 @@ void compile_import_from(compiler_t *comp, py_parse_node_struct_t *pns) {
}
EMIT(load_const_verbatim_str, ")");
EMIT(load_const_verbatim_end);
#else
for (int i = 0; i < n; i++) {
assert(PY_PARSE_NODE_IS_STRUCT_KIND(pn_nodes[i], PN_import_as_name));
py_parse_node_struct_t *pns3 = (py_parse_node_struct_t*)pn_nodes[i];
qstr id2 = PY_PARSE_NODE_LEAF_ARG(pns3->nodes[0]); // should be id
EMIT(load_const_str, id2, false);
}
EMIT(build_tuple, n);
#endif
// do the import
qstr dummy_q, id1;
do_import_name(comp, pns->nodes[0], &dummy_q, &id1);
for (int i = 0; i < n; i++) {

33
py/runtime.c
View File

@ -2216,6 +2216,39 @@ py_obj_t rt_iternext(py_obj_t o_in) {
}
}
py_obj_t py_builtin___import__(int n, py_obj_t *args) {
printf("import:\n");
for (int i = 0; i < n; i++) {
printf(" ");
py_obj_print(args[i]);
printf("\n");
}
return py_const_none;
}
py_obj_t rt_import_name(qstr name, py_obj_t fromlist, py_obj_t level) {
// build args array
py_obj_t args[5];
args[0] = py_obj_new_str(name);
args[1] = py_const_none; // TODO should be globals
args[2] = py_const_none; // TODO should be locals
args[3] = fromlist;
args[4] = level; // must be 0; we don't yet support other values
// TODO lookup __import__ and call that instead of going straight to builtin implementation
return py_builtin___import__(5, args);
}
py_obj_t rt_import_from(py_obj_t module, qstr name) {
py_obj_t x = rt_load_attr(module, name);
/* TODO convert AttributeError to ImportError
if (fail) {
(ImportError, "cannot import name %s", qstr_str(name), NULL)
}
*/
return x;
}
// these must correspond to the respective enum
void *const rt_fun_table[RT_F_NUMBER_OF] = {
rt_load_const_dec,

2
py/runtime.h
View File

@ -145,6 +145,8 @@ void rt_store_attr(py_obj_t base, qstr attr, py_obj_t val);
void rt_store_subscr(py_obj_t base, py_obj_t index, py_obj_t val);
py_obj_t rt_getiter(py_obj_t o);
py_obj_t rt_iternext(py_obj_t o);
py_obj_t rt_import_name(qstr name, py_obj_t fromlist, py_obj_t level);
py_obj_t rt_import_from(py_obj_t module, qstr name);
// temporary way of making C modules
py_obj_t py_module_new(void);

44
py/vm.c
View File

@ -19,6 +19,8 @@
#define DECODE_QSTR do { qstr = *ip++; if (qstr > 127) { qstr = ((qstr & 0x3f) << 8) | (*ip++); } } while (0)
#define PUSH(val) *--sp = (val)
#define POP() (*sp++)
#define TOP() (*sp)
#define SET_TOP(val) *sp = (val)
// args are in reverse order in array
py_obj_t py_execute_byte_code(const byte *code, const py_obj_t *args, uint n_args, uint n_state) {
@ -130,7 +132,7 @@ bool py_execute_byte_code_2(const byte **ip_in_out, py_obj_t *fastn, py_obj_t **
case PYBC_LOAD_ATTR:
DECODE_QSTR;
*sp = rt_load_attr(*sp, qstr);
SET_TOP(rt_load_attr(TOP(), qstr));
break;
case PYBC_LOAD_METHOD:
@ -182,7 +184,7 @@ bool py_execute_byte_code_2(const byte **ip_in_out, py_obj_t *fastn, py_obj_t **
break;
case PYBC_DUP_TOP:
obj1 = *sp;
obj1 = TOP();
PUSH(obj1);
break;
@ -230,7 +232,7 @@ bool py_execute_byte_code_2(const byte **ip_in_out, py_obj_t *fastn, py_obj_t **
case PYBC_JUMP_IF_TRUE_OR_POP:
DECODE_SLABEL;
if (rt_is_true(*sp)) {
if (rt_is_true(TOP())) {
ip += unum;
} else {
sp++;
@ -239,7 +241,7 @@ bool py_execute_byte_code_2(const byte **ip_in_out, py_obj_t *fastn, py_obj_t **
case PYBC_JUMP_IF_FALSE_OR_POP:
DECODE_SLABEL;
if (rt_is_true(*sp)) {
if (rt_is_true(TOP())) {
sp++;
} else {
ip += unum;
@ -269,12 +271,12 @@ bool py_execute_byte_code_2(const byte **ip_in_out, py_obj_t *fastn, py_obj_t **
break;
case PYBC_GET_ITER:
*sp = rt_getiter(*sp);
SET_TOP(rt_getiter(TOP()));
break;
case PYBC_FOR_ITER:
DECODE_ULABEL; // the jump offset if iteration finishes; for labels are always forward
obj1 = rt_iternext(*sp);
obj1 = rt_iternext(TOP());
if (obj1 == py_const_stop_iteration) {
++sp; // pop the exhausted iterator
ip += unum; // jump to after for-block
@ -300,35 +302,35 @@ bool py_execute_byte_code_2(const byte **ip_in_out, py_obj_t *fastn, py_obj_t **
case PYBC_UNARY_OP:
unum = *ip++;
*sp = rt_unary_op(unum, *sp);
SET_TOP(rt_unary_op(unum, TOP()));
break;
case PYBC_BINARY_OP:
unum = *ip++;
obj2 = POP();
obj1 = *sp;
*sp = rt_binary_op(unum, obj1, obj2);
obj1 = TOP();
SET_TOP(rt_binary_op(unum, obj1, obj2));
break;
case PYBC_COMPARE_OP:
unum = *ip++;
obj2 = POP();
obj1 = *sp;
*sp = rt_compare_op(unum, obj1, obj2);
obj1 = TOP();
SET_TOP(rt_compare_op(unum, obj1, obj2));
break;
case PYBC_BUILD_TUPLE:
DECODE_UINT;
obj1 = rt_build_tuple(unum, sp);
sp += unum - 1;
*sp = obj1;
SET_TOP(obj1);
break;
case PYBC_BUILD_LIST:
DECODE_UINT;
obj1 = rt_build_list(unum, sp);
sp += unum - 1;
*sp = obj1;
SET_TOP(obj1);
break;
case PYBC_LIST_APPEND:
@ -359,7 +361,7 @@ bool py_execute_byte_code_2(const byte **ip_in_out, py_obj_t *fastn, py_obj_t **
DECODE_UINT;
obj1 = rt_build_set(unum, sp);
sp += unum - 1;
*sp = obj1;
SET_TOP(obj1);
break;
case PYBC_SET_ADD:
@ -400,7 +402,7 @@ bool py_execute_byte_code_2(const byte **ip_in_out, py_obj_t *fastn, py_obj_t **
obj1 = rt_call_method_n_kw(unum & 0xff, (unum >> 8) & 0xff, sp);
sp += (unum & 0xff) + ((unum >> 7) & 0x1fe) + 1;
}
*sp = obj1;
SET_TOP(obj1);
break;
case PYBC_RETURN_VALUE:
@ -418,6 +420,18 @@ bool py_execute_byte_code_2(const byte **ip_in_out, py_obj_t *fastn, py_obj_t **
*sp_in_out = sp;
return true;
case PYBC_IMPORT_NAME:
DECODE_QSTR;
obj1 = POP();
SET_TOP(rt_import_name(qstr, obj1, TOP()));
break;
case PYBC_IMPORT_FROM:
DECODE_QSTR;
obj1 = rt_import_from(TOP(), qstr);
PUSH(obj1);
break;
default:
printf("code %p, byte code 0x%02x not implemented\n", ip, op);
assert(0);