py: Remove mp_load_const_bytes and instead load precreated bytes object.
Previous to this patch each time a bytes object was referenced a new
instance (with the same data) was created. With this patch a single
bytes object is created in the compiler and is loaded directly at execute
time as a true constant (similar to loading bignum and float objects).
This saves on allocating RAM and means that bytes objects can now be
used when the memory manager is locked (eg in interrupts).
The MP_BC_LOAD_CONST_BYTES bytecode was removed as part of this.
Generated bytecode is slightly larger due to storing a pointer to the
bytes object instead of the qstr identifier.
Code size is reduced by about 60 bytes on Thumb2 architectures.
diff --git a/py/compile.c b/py/compile.c
index 45217cf..141cd2d 100644
--- a/py/compile.c
+++ b/py/compile.c
@@ -1078,7 +1078,7 @@
if (comp->have_star) {
comp->num_dict_params += 1;
#if MICROPY_EMIT_CPYTHON
- EMIT_ARG(load_const_str, MP_PARSE_NODE_LEAF_ARG(pn_id), false);
+ EMIT_ARG(load_const_str, MP_PARSE_NODE_LEAF_ARG(pn_id));
compile_node(comp, pn_equal);
#else
// in Micro Python we put the default dict parameters into a dictionary using the bytecode
@@ -1096,7 +1096,7 @@
// compile value then key, then store it to the dict
compile_node(comp, pn_equal);
- EMIT_ARG(load_const_str, MP_PARSE_NODE_LEAF_ARG(pn_id), false);
+ EMIT_ARG(load_const_str, MP_PARSE_NODE_LEAF_ARG(pn_id));
EMIT(store_map);
#endif
} else {
@@ -1178,7 +1178,7 @@
close_over_variables_etc(comp, cscope, 0, 0);
// get its name
- EMIT_ARG(load_const_str, cscope->simple_name, false);
+ EMIT_ARG(load_const_str, cscope->simple_name);
// nodes[1] has parent classes, if any
// empty parenthesis (eg class C():) gets here as an empty PN_classdef_2 and needs special handling
@@ -1553,7 +1553,7 @@
#if MICROPY_EMIT_CPYTHON
EMIT_ARG(load_const_verbatim_strn, "('*',)", 6);
#else
- EMIT_ARG(load_const_str, MP_QSTR__star_, false);
+ EMIT_ARG(load_const_str, MP_QSTR__star_);
EMIT_ARG(build_tuple, 1);
#endif
@@ -1597,7 +1597,7 @@
assert(MP_PARSE_NODE_IS_STRUCT_KIND(pn_nodes[i], PN_import_as_name));
mp_parse_node_struct_t *pns3 = (mp_parse_node_struct_t*)pn_nodes[i];
qstr id2 = MP_PARSE_NODE_LEAF_ARG(pns3->nodes[0]); // should be id
- EMIT_ARG(load_const_str, id2, false);
+ EMIT_ARG(load_const_str, id2);
}
EMIT_ARG(build_tuple, n);
#endif
@@ -2531,7 +2531,7 @@
compile_syntax_error(comp, (mp_parse_node_t)pns_arg, "LHS of keyword arg must be an id");
return;
}
- EMIT_ARG(load_const_str, MP_PARSE_NODE_LEAF_ARG(pns_arg->nodes[0]), false);
+ EMIT_ARG(load_const_str, MP_PARSE_NODE_LEAF_ARG(pns_arg->nodes[0]));
compile_node(comp, pns2->nodes[0]);
n_keyword += 1;
} else {
@@ -2979,8 +2979,17 @@
mp_uint_t arg = MP_PARSE_NODE_LEAF_ARG(pn);
switch (MP_PARSE_NODE_LEAF_KIND(pn)) {
case MP_PARSE_NODE_ID: compile_load_id(comp, arg); break;
- case MP_PARSE_NODE_STRING: EMIT_ARG(load_const_str, arg, false); break;
- case MP_PARSE_NODE_BYTES: EMIT_ARG(load_const_str, arg, true); break;
+ case MP_PARSE_NODE_STRING: EMIT_ARG(load_const_str, arg); break;
+ case MP_PARSE_NODE_BYTES:
+ // only create and load the actual bytes object on the last pass
+ if (comp->pass != MP_PASS_EMIT) {
+ EMIT_ARG(load_const_obj, mp_const_none);
+ } else {
+ mp_uint_t len;
+ const byte *data = qstr_data(arg, &len);
+ EMIT_ARG(load_const_obj, mp_obj_new_bytes(data, len));
+ }
+ break;
case MP_PARSE_NODE_TOKEN: default:
if (arg == MP_TOKEN_NEWLINE) {
// this can occur when file_input lets through a NEWLINE (eg if file starts with a newline)
@@ -3367,7 +3376,7 @@
compile_load_id(comp, MP_QSTR___name__);
compile_store_id(comp, MP_QSTR___module__);
- EMIT_ARG(load_const_str, MP_PARSE_NODE_LEAF_ARG(pns->nodes[0]), false); // 0 is class name
+ EMIT_ARG(load_const_str, MP_PARSE_NODE_LEAF_ARG(pns->nodes[0])); // 0 is class name
compile_store_id(comp, MP_QSTR___qualname__);
check_for_doc_string(comp, pns->nodes[2]);