circuitpython/py/emitpass1.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 <assert.h>
#include "py/emit.h"
struct _emit_t {
scope_t *scope;
};
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emit_t *emit_pass1_new(void) {
emit_t *emit = m_new(emit_t, 1);
return emit;
}
void emit_pass1_free(emit_t *emit) {
m_del_obj(emit_t, emit);
}
STATIC void emit_pass1_dummy(emit_t *emit) {
(void)emit;
}
STATIC void emit_pass1_start_pass(emit_t *emit, pass_kind_t pass, scope_t *scope) {
assert(pass == MP_PASS_SCOPE);
emit->scope = scope;
}
STATIC void emit_pass1_end_pass(emit_t *emit) {
(void)emit;
}
STATIC bool emit_pass1_last_emit_was_return_value(emit_t *emit) {
(void)emit;
return false;
}
STATIC void emit_pass1_load_id(emit_t *emit, qstr qst) {
// name adding/lookup
bool added;
id_info_t *id = scope_find_or_add_id(emit->scope, qst, &added);
if (added) {
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#if MICROPY_EMIT_CPYTHON
if (qst == MP_QSTR_super && emit->scope->kind == SCOPE_FUNCTION) {
// special case, super is a global, and also counts as use of __class__
id->kind = ID_INFO_KIND_GLOBAL_EXPLICIT;
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id_info_t *id2 = scope_find_local_in_parent(emit->scope, MP_QSTR___class__);
if (id2 != NULL) {
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id2 = scope_find_or_add_id(emit->scope, MP_QSTR___class__, &added);
if (added) {
id2->kind = ID_INFO_KIND_FREE;
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scope_close_over_in_parents(emit->scope, MP_QSTR___class__);
}
}
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} else
#endif
{
id_info_t *id2 = scope_find_local_in_parent(emit->scope, qst);
if (id2 != NULL && (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(emit->scope, qst);
} else {
id->kind = ID_INFO_KIND_GLOBAL_IMPLICIT;
}
}
}
}
STATIC id_info_t *get_id_for_modification(scope_t *scope, qstr qst) {
// name adding/lookup
bool added;
id_info_t *id = scope_find_or_add_id(scope, qst, &added);
if (added) {
if (scope->kind == SCOPE_MODULE || scope->kind == SCOPE_CLASS) {
id->kind = ID_INFO_KIND_GLOBAL_IMPLICIT;
} else {
id->kind = ID_INFO_KIND_LOCAL;
}
} else if (scope->kind >= SCOPE_FUNCTION && scope->kind <= SCOPE_GEN_EXPR && id->kind == ID_INFO_KIND_GLOBAL_IMPLICIT) {
// rebind as a local variable
id->kind = ID_INFO_KIND_LOCAL;
}
assert(id != NULL); // TODO can this ever fail?
return id;
}
STATIC void emit_pass1_store_id(emit_t *emit, qstr qst) {
get_id_for_modification(emit->scope, qst);
}
STATIC void emit_pass1_delete_id(emit_t *emit, qstr qst) {
id_info_t *id = get_id_for_modification(emit->scope, qst);
// this flag is unused
//id->flags |= ID_FLAG_IS_DELETED;
(void)id; // suppress compiler warning
}
const emit_method_table_t emit_pass1_method_table = {
(void*)emit_pass1_dummy,
emit_pass1_start_pass,
emit_pass1_end_pass,
emit_pass1_last_emit_was_return_value,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
emit_pass1_load_id,
emit_pass1_store_id,
emit_pass1_delete_id,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
#if MICROPY_PY_BUILTINS_SET
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
#endif
#if MICROPY_PY_BUILTINS_SLICE
(void*)emit_pass1_dummy,
#endif
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
#if MICROPY_EMIT_CPYTHON
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
(void*)emit_pass1_dummy,
#endif
};