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1 : : /*
2 : : * This file is part of the MicroPython project, http://micropython.org/
3 : : *
4 : : * The MIT License (MIT)
5 : : *
6 : : * Copyright (c) 2013, 2014 Damien P. George
7 : : *
8 : : * Permission is hereby granted, free of charge, to any person obtaining a copy
9 : : * of this software and associated documentation files (the "Software"), to deal
10 : : * in the Software without restriction, including without limitation the rights
11 : : * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 : : * copies of the Software, and to permit persons to whom the Software is
13 : : * furnished to do so, subject to the following conditions:
14 : : *
15 : : * The above copyright notice and this permission notice shall be included in
16 : : * all copies or substantial portions of the Software.
17 : : *
18 : : * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 : : * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 : : * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 : : * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 : : * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 : : * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 : : * THE SOFTWARE.
25 : : */
26 : :
27 : : #include <assert.h>
28 : :
29 : : #include "py/scope.h"
30 : :
31 : : #if MICROPY_ENABLE_COMPILER
32 : :
33 : : // These low numbered qstrs should fit in 8 bits. See assertions below.
34 : : STATIC const uint8_t scope_simple_name_table[] = {
35 : : [SCOPE_MODULE] = MP_QSTR__lt_module_gt_,
36 : : [SCOPE_LAMBDA] = MP_QSTR__lt_lambda_gt_,
37 : : [SCOPE_LIST_COMP] = MP_QSTR__lt_listcomp_gt_,
38 : : [SCOPE_DICT_COMP] = MP_QSTR__lt_dictcomp_gt_,
39 : : [SCOPE_SET_COMP] = MP_QSTR__lt_setcomp_gt_,
40 : : [SCOPE_GEN_EXPR] = MP_QSTR__lt_genexpr_gt_,
41 : : };
42 : :
43 : 9328 : scope_t *scope_new(scope_kind_t kind, mp_parse_node_t pn, mp_uint_t emit_options) {
44 : : // Make sure those qstrs indeed fit in an uint8_t.
45 : 9328 : MP_STATIC_ASSERT(MP_QSTR__lt_module_gt_ <= UINT8_MAX);
46 : 9328 : MP_STATIC_ASSERT(MP_QSTR__lt_lambda_gt_ <= UINT8_MAX);
47 : 9328 : MP_STATIC_ASSERT(MP_QSTR__lt_listcomp_gt_ <= UINT8_MAX);
48 : 9328 : MP_STATIC_ASSERT(MP_QSTR__lt_dictcomp_gt_ <= UINT8_MAX);
49 : 9328 : MP_STATIC_ASSERT(MP_QSTR__lt_setcomp_gt_ <= UINT8_MAX);
50 : 9328 : MP_STATIC_ASSERT(MP_QSTR__lt_genexpr_gt_ <= UINT8_MAX);
51 : :
52 : 9328 : scope_t *scope = m_new0(scope_t, 1);
53 : 9328 : scope->kind = kind;
54 : 9328 : scope->pn = pn;
55 [ + + ]: 9328 : if (kind == SCOPE_FUNCTION || kind == SCOPE_CLASS) {
56 [ + - - + ]: 5336 : assert(MP_PARSE_NODE_IS_STRUCT(pn));
57 : 5336 : scope->simple_name = MP_PARSE_NODE_LEAF_ARG(((mp_parse_node_struct_t *)pn)->nodes[0]);
58 : : } else {
59 : 3992 : scope->simple_name = scope_simple_name_table[kind];
60 : : }
61 : 9328 : scope->raw_code = mp_emit_glue_new_raw_code();
62 : 9328 : scope->emit_options = emit_options;
63 : 9328 : scope->id_info_alloc = MICROPY_ALLOC_SCOPE_ID_INIT;
64 : 9328 : scope->id_info = m_new(id_info_t, scope->id_info_alloc);
65 : :
66 : 9328 : return scope;
67 : : }
68 : :
69 : 9290 : void scope_free(scope_t *scope) {
70 : 9290 : m_del(id_info_t, scope->id_info, scope->id_info_alloc);
71 : 9290 : m_del(scope_t, scope, 1);
72 : 9290 : }
73 : :
74 : 101689 : id_info_t *scope_find_or_add_id(scope_t *scope, qstr qst, id_info_kind_t kind) {
75 : 101689 : id_info_t *id_info = scope_find(scope, qst);
76 [ + + ]: 101689 : if (id_info != NULL) {
77 : : return id_info;
78 : : }
79 : :
80 : : // make sure we have enough memory
81 [ + + ]: 37182 : if (scope->id_info_len >= scope->id_info_alloc) {
82 : 3705 : scope->id_info = m_renew(id_info_t, scope->id_info, scope->id_info_alloc, scope->id_info_alloc + MICROPY_ALLOC_SCOPE_ID_INC);
83 : 3705 : scope->id_info_alloc += MICROPY_ALLOC_SCOPE_ID_INC;
84 : : }
85 : :
86 : : // add new id to end of array of all ids; this seems to match CPython
87 : : // important thing is that function arguments are first, but that is
88 : : // handled by the compiler because it adds arguments before compiling the body
89 : 37182 : id_info = &scope->id_info[scope->id_info_len++];
90 : :
91 : 37182 : id_info->kind = kind;
92 : 37182 : id_info->flags = 0;
93 : 37182 : id_info->local_num = 0;
94 : 37182 : id_info->qst = qst;
95 : 37182 : return id_info;
96 : : }
97 : :
98 : 511973 : id_info_t *scope_find(scope_t *scope, qstr qst) {
99 [ + + ]: 2219913 : for (mp_uint_t i = 0; i < scope->id_info_len; i++) {
100 [ + + ]: 2180398 : if (scope->id_info[i].qst == qst) {
101 : : return &scope->id_info[i];
102 : : }
103 : : }
104 : : return NULL;
105 : : }
106 : :
107 : 323 : id_info_t *scope_find_global(scope_t *scope, qstr qst) {
108 [ + + ]: 752 : while (scope->parent != NULL) {
109 : : scope = scope->parent;
110 : : }
111 : 323 : return scope_find(scope, qst);
112 : : }
113 : :
114 : 195 : STATIC void scope_close_over_in_parents(scope_t *scope, qstr qst) {
115 [ - + ]: 195 : assert(scope->parent != NULL); // we should have at least 1 parent
116 : 13 : for (scope_t *s = scope->parent;; s = s->parent) {
117 [ - + ]: 208 : assert(s->parent != NULL); // we should not get to the outer scope
118 : 208 : id_info_t *id = scope_find_or_add_id(s, qst, ID_INFO_KIND_UNDECIDED);
119 [ + + ]: 208 : if (id->kind == ID_INFO_KIND_UNDECIDED) {
120 : : // variable not previously declared in this scope, so declare it as free and keep searching parents
121 : 13 : id->kind = ID_INFO_KIND_FREE;
122 : : } else {
123 : : // variable is declared in this scope, so finish
124 [ + + ]: 195 : if (id->kind == ID_INFO_KIND_LOCAL) {
125 : : // variable local to this scope, close it over
126 : 173 : id->kind = ID_INFO_KIND_CELL;
127 : : } else {
128 : : // ID_INFO_KIND_FREE: variable already closed over in a parent scope
129 : : // ID_INFO_KIND_CELL: variable already closed over in this scope
130 [ - + ]: 22 : assert(id->kind == ID_INFO_KIND_FREE || id->kind == ID_INFO_KIND_CELL);
131 : : }
132 : 195 : return;
133 : : }
134 : : }
135 : : }
136 : :
137 : 15224 : void scope_check_to_close_over(scope_t *scope, id_info_t *id) {
138 [ + + ]: 15224 : if (scope->parent != NULL) {
139 [ + + ]: 9880 : for (scope_t *s = scope->parent; s->parent != NULL; s = s->parent) {
140 : 2584 : id_info_t *id2 = scope_find(s, id->qst);
141 [ + + ]: 2584 : if (id2 != NULL) {
142 [ + + ]: 425 : if (id2->kind == ID_INFO_KIND_LOCAL || id2->kind == ID_INFO_KIND_CELL || id2->kind == ID_INFO_KIND_FREE) {
143 : 195 : id->kind = ID_INFO_KIND_FREE;
144 : 195 : scope_close_over_in_parents(scope, id->qst);
145 : : }
146 : : break;
147 : : }
148 : : }
149 : : }
150 : 15224 : }
151 : :
152 : : #endif // MICROPY_ENABLE_COMPILER
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