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circuitpython/py/scope.c

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/*
* This file is part of the Micro Python 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 <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <assert.h>
#include "mpconfig.h"
#include "misc.h"
#include "qstr.h"
#include "obj.h"
#include "parse.h"
#include "emitglue.h"
#include "scope.h"
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;
switch (kind) {
case SCOPE_MODULE:
scope->simple_name = MP_QSTR__lt_module_gt_;
break;
case SCOPE_FUNCTION:
case 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]);
break;
case SCOPE_LAMBDA:
scope->simple_name = MP_QSTR__lt_lambda_gt_;
break;
case SCOPE_LIST_COMP:
scope->simple_name = MP_QSTR__lt_listcomp_gt_;
break;
case SCOPE_DICT_COMP:
scope->simple_name = MP_QSTR__lt_dictcomp_gt_;
break;
case SCOPE_SET_COMP:
scope->simple_name = MP_QSTR__lt_setcomp_gt_;
break;
case SCOPE_GEN_EXPR:
scope->simple_name = MP_QSTR__lt_genexpr_gt_;
break;
default:
assert(0);
}
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 qstr, bool *added) {
id_info_t *id_info = scope_find(scope, qstr);
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->qstr = qstr;
*added = true;
return id_info;
}
id_info_t *scope_find(scope_t *scope, qstr qstr) {
for (mp_uint_t i = 0; i < scope->id_info_len; i++) {
if (scope->id_info[i].qstr == qstr) {
return &scope->id_info[i];
}
}
return NULL;
}
id_info_t *scope_find_global(scope_t *scope, qstr qstr) {
while (scope->parent != NULL) {
scope = scope->parent;
}
return scope_find(scope, qstr);
}
id_info_t *scope_find_local_in_parent(scope_t *scope, qstr qstr) {
if (scope->parent == NULL) {
return NULL;
}
for (scope_t *s = scope->parent; s->parent != NULL; s = s->parent) {
id_info_t *id = scope_find(s, qstr);
if (id != NULL) {
return id;
}
}
return NULL;
}
void scope_close_over_in_parents(scope_t *scope, qstr qstr) {
assert(scope->parent != NULL); // we should have at least 1 parent
for (scope_t *s = scope->parent; s->parent != NULL; s = s->parent) {
bool added;
id_info_t *id = scope_find_or_add_id(s, qstr, &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
switch (id->kind) {
case ID_INFO_KIND_LOCAL: id->kind = ID_INFO_KIND_CELL; break; // variable local to this scope, close it over
case ID_INFO_KIND_FREE: break; // variable already closed over in a parent scope
case ID_INFO_KIND_CELL: break; // variable already closed over in this scope
default: assert(0); // TODO
}
return;
}
}
assert(0); // we should have found the variable in one of the parents
}
void scope_declare_global(scope_t *scope, qstr qstr) {
if (scope->kind == SCOPE_MODULE) {
printf("SyntaxError?: can't declare global in outer code\n");
return;
}
bool added;
id_info_t *id_info = scope_find_or_add_id(scope, qstr, &added);
if (!added) {
printf("SyntaxError?: identifier already declared something\n");
return;
}
id_info->kind = ID_INFO_KIND_GLOBAL_EXPLICIT;
// if the id exists in the global scope, set its kind to EXPLICIT_GLOBAL
id_info = scope_find_global(scope, qstr);
if (id_info != NULL) {
id_info->kind = ID_INFO_KIND_GLOBAL_EXPLICIT;
}
}
void scope_declare_nonlocal(scope_t *scope, qstr qstr) {
if (scope->kind == SCOPE_MODULE) {
printf("SyntaxError?: can't declare nonlocal in outer code\n");
return;
}
bool added;
id_info_t *id_info = scope_find_or_add_id(scope, qstr, &added);
if (!added) {
printf("SyntaxError?: identifier already declared something\n");
return;
}
id_info_t *id_info2 = scope_find_local_in_parent(scope, qstr);
if (id_info2 == NULL || !(id_info2->kind == ID_INFO_KIND_LOCAL || id_info2->kind == ID_INFO_KIND_CELL || id_info2->kind == ID_INFO_KIND_FREE)) {
printf("SyntaxError: no binding for nonlocal '%s' found\n", qstr_str(qstr));
return;
}
id_info->kind = ID_INFO_KIND_FREE;
scope_close_over_in_parents(scope, qstr);
}
#if MICROPY_EMIT_CPYTHON
void scope_print_info(scope_t *s) {
if (s->kind == SCOPE_MODULE) {
printf("code <module>\n");
} else if (s->kind == SCOPE_LAMBDA) {
printf("code <lambda>\n");
} else if (s->kind == SCOPE_LIST_COMP) {
printf("code <listcomp>\n");
} else if (s->kind == SCOPE_DICT_COMP) {
printf("code <dictcomp>\n");
} else if (s->kind == SCOPE_SET_COMP) {
printf("code <setcomp>\n");
} else if (s->kind == SCOPE_GEN_EXPR) {
printf("code <genexpr>\n");
} else {
printf("code %s\n", qstr_str(s->simple_name));
}
/*
printf("var global:");
for (int i = 0; i < s->id_info_len; i++) {
if (s->id_info[i].kind == ID_INFO_KIND_GLOBAL_EXPLICIT) {
printf(" %s", qstr_str(s->id_info[i].qstr));
}
}
printf("\n");
printf("var name:");
for (int i = 0; i < s->id_info_len; i++) {
if (s->id_info[i].kind == ID_INFO_KIND_GLOBAL_IMPLICIT) {
printf(" %s", qstr_str(s->id_info[i].qstr));
}
}
printf("\n");
printf("var local:");
for (int i = 0; i < s->id_info_len; i++) {
if (s->id_info[i].kind == ID_INFO_KIND_LOCAL) {
printf(" %s", qstr_str(s->id_info[i].qstr));
}
}
printf("\n");
printf("var free:");
for (int i = 0; i < s->id_info_len; i++) {
if (s->id_info[i].kind == ID_INFO_KIND_FREE) {
printf(" %s", qstr_str(s->id_info[i].qstr));
}
}
printf("\n");
*/
printf(" flags %04x\n", s->scope_flags);
printf(" argcount %d\n", s->num_pos_args);
printf(" nlocals %d\n", s->num_locals);
printf(" stacksize %d\n", s->stack_size);
}
#endif
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