circuitpython/py/emitcommon.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.
*/
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#include <assert.h>
#include "py/emit.h"
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#if MICROPY_ENABLE_COMPILER
void mp_emit_common_get_id_for_load(scope_t *scope, qstr qst) {
// name adding/lookup
bool added;
id_info_t *id = scope_find_or_add_id(scope, qst, &added);
if (added) {
unix-cpy: Remove unix-cpy. It's no longer needed. unix-cpy was originally written to get semantic equivalent with CPython without writing functional tests. When writing the initial implementation of uPy it was a long way between lexer and functional tests, so the half-way test was to make sure that the bytecode was correct. The idea was that if the uPy bytecode matched CPython 1-1 then uPy would be proper Python if the bytecodes acted correctly. And having matching bytecode meant that it was less likely to miss some deep subtlety in the Python semantics that would require an architectural change later on. But that is all history and it no longer makes sense to retain the ability to output CPython bytecode, because: 1. It outputs CPython 3.3 compatible bytecode. CPython's bytecode changes from version to version, and seems to have changed quite a bit in 3.5. There's no point in changing the bytecode output to match CPython anymore. 2. uPy and CPy do different optimisations to the bytecode which makes it harder to match. 3. The bytecode tests are not run. They were never part of Travis and are not run locally anymore. 4. The EMIT_CPYTHON option needs a lot of extra source code which adds heaps of noise, especially in compile.c. 5. Now that there is an extensive test suite (which tests functionality) there is no need to match the bytecode. Some very subtle behaviour is tested with the test suite and passing these tests is a much better way to stay Python-language compliant, rather than trying to match CPy bytecode.
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id_info_t *id2 = scope_find_local_in_parent(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(scope, qst);
} else {
id->kind = ID_INFO_KIND_GLOBAL_IMPLICIT;
}
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}
}
void mp_emit_common_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;
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}
}
void mp_emit_common_id_op(emit_t *emit, const mp_emit_method_table_id_ops_t *emit_method_table, scope_t *scope, qstr qst) {
// assumes pass is greater than 1, ie that all identifiers are defined in the scope
id_info_t *id = scope_find(scope, qst);
assert(id != NULL);
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// call the emit backend with the correct code
if (id->kind == ID_INFO_KIND_GLOBAL_IMPLICIT) {
emit_method_table->name(emit, qst);
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} else if (id->kind == ID_INFO_KIND_GLOBAL_EXPLICIT) {
emit_method_table->global(emit, qst);
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} else if (id->kind == ID_INFO_KIND_LOCAL) {
emit_method_table->fast(emit, qst, id->local_num);
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} else {
assert(id->kind == ID_INFO_KIND_CELL || id->kind == ID_INFO_KIND_FREE);
emit_method_table->deref(emit, qst, id->local_num);
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}
}
#endif // MICROPY_ENABLE_COMPILER