584ba6762f
This patch gives proper SyntaxError exceptions for bad global/nonlocal declarations. It also reduces code size: 304 bytes on unix x64, 132 bytes on stmhal.
216 lines
7.2 KiB
C
216 lines
7.2 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include <assert.h>
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#include "mpconfig.h"
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#include "misc.h"
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#include "qstr.h"
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#include "obj.h"
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#include "parse.h"
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#include "emitglue.h"
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#include "scope.h"
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scope_t *scope_new(scope_kind_t kind, mp_parse_node_t pn, qstr source_file, mp_uint_t emit_options) {
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scope_t *scope = m_new0(scope_t, 1);
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scope->kind = kind;
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scope->pn = pn;
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scope->source_file = source_file;
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switch (kind) {
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case SCOPE_MODULE:
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scope->simple_name = MP_QSTR__lt_module_gt_;
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break;
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case SCOPE_FUNCTION:
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case SCOPE_CLASS:
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assert(MP_PARSE_NODE_IS_STRUCT(pn));
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scope->simple_name = MP_PARSE_NODE_LEAF_ARG(((mp_parse_node_struct_t*)pn)->nodes[0]);
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break;
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case SCOPE_LAMBDA:
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scope->simple_name = MP_QSTR__lt_lambda_gt_;
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break;
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case SCOPE_LIST_COMP:
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scope->simple_name = MP_QSTR__lt_listcomp_gt_;
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break;
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case SCOPE_DICT_COMP:
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scope->simple_name = MP_QSTR__lt_dictcomp_gt_;
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break;
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case SCOPE_SET_COMP:
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scope->simple_name = MP_QSTR__lt_setcomp_gt_;
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break;
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case SCOPE_GEN_EXPR:
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scope->simple_name = MP_QSTR__lt_genexpr_gt_;
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break;
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default:
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assert(0);
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}
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scope->raw_code = mp_emit_glue_new_raw_code();
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scope->emit_options = emit_options;
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scope->id_info_alloc = MICROPY_ALLOC_SCOPE_ID_INIT;
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scope->id_info = m_new(id_info_t, scope->id_info_alloc);
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return scope;
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}
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void scope_free(scope_t *scope) {
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m_del(id_info_t, scope->id_info, scope->id_info_alloc);
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m_del(scope_t, scope, 1);
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}
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id_info_t *scope_find_or_add_id(scope_t *scope, qstr qst, bool *added) {
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id_info_t *id_info = scope_find(scope, qst);
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if (id_info != NULL) {
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*added = false;
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return id_info;
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}
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// make sure we have enough memory
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if (scope->id_info_len >= scope->id_info_alloc) {
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scope->id_info = m_renew(id_info_t, scope->id_info, scope->id_info_alloc, scope->id_info_alloc + MICROPY_ALLOC_SCOPE_ID_INC);
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scope->id_info_alloc += MICROPY_ALLOC_SCOPE_ID_INC;
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}
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// add new id to end of array of all ids; this seems to match CPython
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// important thing is that function arguments are first, but that is
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// handled by the compiler because it adds arguments before compiling the body
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id_info = &scope->id_info[scope->id_info_len++];
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id_info->kind = 0;
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id_info->flags = 0;
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id_info->local_num = 0;
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id_info->qst = qst;
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*added = true;
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return id_info;
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}
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id_info_t *scope_find(scope_t *scope, qstr qst) {
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for (mp_uint_t i = 0; i < scope->id_info_len; i++) {
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if (scope->id_info[i].qst == qst) {
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return &scope->id_info[i];
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}
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}
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return NULL;
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}
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id_info_t *scope_find_global(scope_t *scope, qstr qst) {
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while (scope->parent != NULL) {
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scope = scope->parent;
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}
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return scope_find(scope, qst);
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}
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id_info_t *scope_find_local_in_parent(scope_t *scope, qstr qst) {
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if (scope->parent == NULL) {
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return NULL;
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}
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for (scope_t *s = scope->parent; s->parent != NULL; s = s->parent) {
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id_info_t *id = scope_find(s, qst);
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if (id != NULL) {
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return id;
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}
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}
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return NULL;
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}
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void scope_close_over_in_parents(scope_t *scope, qstr qst) {
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assert(scope->parent != NULL); // we should have at least 1 parent
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for (scope_t *s = scope->parent; s->parent != NULL; s = s->parent) {
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bool added;
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id_info_t *id = scope_find_or_add_id(s, qst, &added);
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if (added) {
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// variable not previously declared in this scope, so declare it as free and keep searching parents
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id->kind = ID_INFO_KIND_FREE;
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} else {
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// variable is declared in this scope, so finish
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switch (id->kind) {
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case ID_INFO_KIND_LOCAL: id->kind = ID_INFO_KIND_CELL; break; // variable local to this scope, close it over
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case ID_INFO_KIND_FREE: break; // variable already closed over in a parent scope
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case ID_INFO_KIND_CELL: break; // variable already closed over in this scope
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default: assert(0); // TODO
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}
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return;
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}
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}
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assert(0); // we should have found the variable in one of the parents
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}
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#if MICROPY_EMIT_CPYTHON
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#include <stdio.h>
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void scope_print_info(scope_t *s) {
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if (s->kind == SCOPE_MODULE) {
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printf("code <module>\n");
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} else if (s->kind == SCOPE_LAMBDA) {
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printf("code <lambda>\n");
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} else if (s->kind == SCOPE_LIST_COMP) {
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printf("code <listcomp>\n");
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} else if (s->kind == SCOPE_DICT_COMP) {
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printf("code <dictcomp>\n");
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} else if (s->kind == SCOPE_SET_COMP) {
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printf("code <setcomp>\n");
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} else if (s->kind == SCOPE_GEN_EXPR) {
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printf("code <genexpr>\n");
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} else {
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printf("code %s\n", qstr_str(s->simple_name));
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}
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/*
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printf("var global:");
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for (int i = 0; i < s->id_info_len; i++) {
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if (s->id_info[i].kind == ID_INFO_KIND_GLOBAL_EXPLICIT) {
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printf(" %s", qstr_str(s->id_info[i].qst));
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}
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}
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printf("\n");
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printf("var name:");
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for (int i = 0; i < s->id_info_len; i++) {
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if (s->id_info[i].kind == ID_INFO_KIND_GLOBAL_IMPLICIT) {
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printf(" %s", qstr_str(s->id_info[i].qst));
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}
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}
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printf("\n");
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printf("var local:");
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for (int i = 0; i < s->id_info_len; i++) {
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if (s->id_info[i].kind == ID_INFO_KIND_LOCAL) {
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printf(" %s", qstr_str(s->id_info[i].qst));
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}
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}
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printf("\n");
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printf("var free:");
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for (int i = 0; i < s->id_info_len; i++) {
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if (s->id_info[i].kind == ID_INFO_KIND_FREE) {
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printf(" %s", qstr_str(s->id_info[i].qst));
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}
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}
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printf("\n");
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*/
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printf(" flags %04x\n", s->scope_flags);
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printf(" argcount %d\n", s->num_pos_args);
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printf(" nlocals %d\n", s->num_locals);
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printf(" stacksize %d\n", s->stack_size);
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}
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#endif
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