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micropython/py/scope.c

266 wiersze
8.5 KiB
C
Czysty Wina Historia

#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "misc.h"
#include "machine.h"
#include "parse.h"
#include "scope.h"
scope_t *scope_new(scope_kind_t kind, py_parse_node_t pn, uint unique_code_id, uint emit_options) {
scope_t *scope = m_new(scope_t, 1);
scope->kind = kind;
scope->parent = NULL;
scope->next = NULL;
scope->pn = pn;
switch (kind) {
case SCOPE_MODULE:
scope->simple_name = 0;
break;
case SCOPE_FUNCTION:
case SCOPE_CLASS:
assert(PY_PARSE_NODE_IS_STRUCT(pn));
scope->simple_name = PY_PARSE_NODE_LEAF_ARG(((py_parse_node_struct_t*)pn)->nodes[0]);
break;
case SCOPE_LAMBDA:
scope->simple_name = qstr_from_str_static("<lambda>");
break;
case SCOPE_LIST_COMP:
scope->simple_name = qstr_from_str_static("<listcomp>");
break;
case SCOPE_DICT_COMP:
scope->simple_name = qstr_from_str_static("<dictcomp>");
break;
case SCOPE_SET_COMP:
scope->simple_name = qstr_from_str_static("<setcomp>");
break;
case SCOPE_GEN_EXPR:
scope->simple_name = qstr_from_str_static("<genexpr>");
break;
default:
assert(0);
}
scope->id_info_alloc = 8;
scope->id_info_len = 0;
scope->id_info = m_new(id_info_t, scope->id_info_alloc);
scope->flags = 0;
scope->num_params = 0;
/* not needed
scope->num_default_params = 0;
scope->num_dict_params = 0;
*/
scope->num_locals = 0;
scope->unique_code_id = unique_code_id;
scope->emit_options = emit_options;
return scope;
}
id_info_t *scope_find_or_add_id(scope_t *scope, qstr qstr, bool *added) {
for (int i = 0; i < scope->id_info_len; i++) {
if (scope->id_info[i].qstr == qstr) {
*added = false;
return &scope->id_info[i];
}
}
// make sure we have enough memory
if (scope->id_info_len >= scope->id_info_alloc) {
scope->id_info_alloc *= 2;
scope->id_info = m_renew(id_info_t, scope->id_info, scope->id_info_alloc);
}
id_info_t *id_info;
{
/*
// just pick next slot in array
id_info = &scope->id_info[scope->id_info_len++];
*/
}
if (0) {
// sort insert into id_info array, so we are equivalent to CPython (no other reason to do it)
// actually, seems that this is not what CPython does...
scope->id_info_len += 1;
for (int i = scope->id_info_len - 1;; i--) {
if (i == 0 || strcmp(qstr_str(scope->id_info[i - 1].qstr), qstr_str(qstr)) < 0) {
id_info = &scope->id_info[i];
break;
} else {
scope->id_info[i] = scope->id_info[i - 1];
}
}
} else {
// just 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->param = false;
id_info->kind = 0;
id_info->qstr = qstr;
*added = true;
return id_info;
}
id_info_t *scope_find(scope_t *scope, qstr qstr) {
for (int 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;
}
for (int 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_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) {
for (int i = 0; i < s->id_info_len; i++) {
if (s->id_info[i].qstr == qstr) {
return &s->id_info[i];
}
}
}
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) {
id_info_t *id = NULL;
for (int i = 0; i < s->id_info_len; i++) {
if (s->id_info[i].qstr == qstr) {
id = &s->id_info[i];
break;
}
}
if (id == NULL) {
// variable not declared in this scope, so declare it as free and keep searching parents
bool added;
id = scope_find_or_add_id(s, qstr, &added);
assert(added);
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);
}
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->flags);
printf(" argcount %d\n", s->num_params);
printf(" nlocals %d\n", s->num_locals);
printf(" stacksize %d\n", s->stack_size);
}
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