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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <assert.h>
#include "py/scope.h"
#if MICROPY_ENABLE_COMPILER
// these low numbered qstrs should fit in 8 bits
STATIC const uint8_t scope_simple_name_table[] = {
[SCOPE_MODULE] = MP_QSTR__lt_module_gt_,
[SCOPE_LAMBDA] = MP_QSTR__lt_lambda_gt_,
[SCOPE_LIST_COMP] = MP_QSTR__lt_listcomp_gt_,
[SCOPE_DICT_COMP] = MP_QSTR__lt_dictcomp_gt_,
[SCOPE_SET_COMP] = MP_QSTR__lt_setcomp_gt_,
[SCOPE_GEN_EXPR] = MP_QSTR__lt_genexpr_gt_,
};
scope_t *scope_new(scope_kind_t kind, mp_parse_node_t pn, qstr source_file, mp_uint_t emit_options) {
scope_t *scope = m_new0(scope_t, 1);
scope->kind = kind;
scope->pn = pn;
scope->source_file = source_file;
if (kind == SCOPE_FUNCTION || kind == SCOPE_CLASS) {
assert(MP_PARSE_NODE_IS_STRUCT(pn));
scope->simple_name = MP_PARSE_NODE_LEAF_ARG(((mp_parse_node_struct_t*)pn)->nodes[0]);
} else {
scope->simple_name = scope_simple_name_table[kind];
}
scope->raw_code = mp_emit_glue_new_raw_code();
scope->emit_options = emit_options;
scope->id_info_alloc = MICROPY_ALLOC_SCOPE_ID_INIT;
scope->id_info = m_new(id_info_t, scope->id_info_alloc);
return scope;
}
void scope_free(scope_t *scope) {
m_del(id_info_t, scope->id_info, scope->id_info_alloc);
m_del(scope_t, scope, 1);
}
id_info_t *scope_find_or_add_id(scope_t *scope, qstr qst, bool *added) {
id_info_t *id_info = scope_find(scope, qst);
if (id_info != NULL) {
*added = false;
return id_info;
}
// make sure we have enough memory
if (scope->id_info_len >= scope->id_info_alloc) {
scope->id_info = m_renew(id_info_t, scope->id_info, scope->id_info_alloc, scope->id_info_alloc + MICROPY_ALLOC_SCOPE_ID_INC);
scope->id_info_alloc += MICROPY_ALLOC_SCOPE_ID_INC;
}
// add new id to end of array of all ids; this seems to match CPython
// important thing is that function arguments are first, but that is
// handled by the compiler because it adds arguments before compiling the body
id_info = &scope->id_info[scope->id_info_len++];
id_info->kind = 0;
id_info->flags = 0;
id_info->local_num = 0;
id_info->qst = qst;
*added = true;
return id_info;
}
id_info_t *scope_find(scope_t *scope, qstr qst) {
for (mp_uint_t i = 0; i < scope->id_info_len; i++) {
if (scope->id_info[i].qst == qst) {
return &scope->id_info[i];
}
}
return NULL;
}
id_info_t *scope_find_global(scope_t *scope, qstr qst) {
while (scope->parent != NULL) {
scope = scope->parent;
}
return scope_find(scope, qst);
}
STATIC void scope_close_over_in_parents(scope_t *scope, qstr qst) {
assert(scope->parent != NULL); // we should have at least 1 parent
for (scope_t *s = scope->parent;; s = s->parent) {
assert(s->parent != NULL); // we should not get to the outer scope
bool added;
id_info_t *id = scope_find_or_add_id(s, qst, &added);
if (added) {
// variable not previously declared in this scope, so declare it as free and keep searching parents
id->kind = ID_INFO_KIND_FREE;
} else {
// variable is declared in this scope, so finish
if (id->kind == ID_INFO_KIND_LOCAL) {
// variable local to this scope, close it over
id->kind = ID_INFO_KIND_CELL;
} else {
// ID_INFO_KIND_FREE: variable already closed over in a parent scope
// ID_INFO_KIND_CELL: variable already closed over in this scope
assert(id->kind == ID_INFO_KIND_FREE || id->kind == ID_INFO_KIND_CELL);
}
return;
}
}
}
void scope_find_local_and_close_over(scope_t *scope, id_info_t *id, qstr qst) {
if (scope->parent != NULL) {
for (scope_t *s = scope->parent; s->parent != NULL; s = s->parent) {
id_info_t *id2 = scope_find(s, qst);
if (id2 != NULL) {
if (id2->kind == ID_INFO_KIND_LOCAL || id2->kind == ID_INFO_KIND_CELL || id2->kind == ID_INFO_KIND_FREE) {
id->kind = ID_INFO_KIND_FREE;
scope_close_over_in_parents(scope, qst);
return;
}
break;
}
}
}
id->kind = ID_INFO_KIND_GLOBAL_IMPLICIT;
}
#endif // MICROPY_ENABLE_COMPILER
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