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py: Move global/nonlocal decl code to compiler for proper SyntaxError.

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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.
This commit is contained in:
Damien George 2014-12-21 17:26:45 +00:00
parent b063b9b36d
commit 584ba6762f
3 changed files with 46 additions and 59 deletions
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60
py/compile.c
View file

@ -1614,30 +1614,58 @@ STATIC void compile_import_from(compiler_t *comp, mp_parse_node_struct_t *pns) {
}
}
STATIC void compile_declare_global(compiler_t *comp, mp_parse_node_t pn, qstr qst) {
bool added;
id_info_t *id_info = scope_find_or_add_id(comp->scope_cur, qst, &added);
if (!added) {
compile_syntax_error(comp, pn, "identifier already used");
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(comp->scope_cur, qst);
if (id_info != NULL) {
id_info->kind = ID_INFO_KIND_GLOBAL_EXPLICIT;
}
}
STATIC void compile_global_stmt(compiler_t *comp, mp_parse_node_struct_t *pns) {
if (comp->pass == MP_PASS_SCOPE) {
if (MP_PARSE_NODE_IS_LEAF(pns->nodes[0])) {
scope_declare_global(comp->scope_cur, MP_PARSE_NODE_LEAF_ARG(pns->nodes[0]));
} else {
pns = (mp_parse_node_struct_t*)pns->nodes[0];
int num_nodes = MP_PARSE_NODE_STRUCT_NUM_NODES(pns);
for (int i = 0; i < num_nodes; i++) {
scope_declare_global(comp->scope_cur, MP_PARSE_NODE_LEAF_ARG(pns->nodes[i]));
}
mp_parse_node_t *nodes;
int n = list_get(&pns->nodes[0], PN_name_list, &nodes);
for (int i = 0; i < n; i++) {
compile_declare_global(comp, (mp_parse_node_t)pns, MP_PARSE_NODE_LEAF_ARG(nodes[i]));
}
}
}
STATIC void compile_declare_nonlocal(compiler_t *comp, mp_parse_node_t pn, qstr qst) {
bool added;
id_info_t *id_info = scope_find_or_add_id(comp->scope_cur, qst, &added);
if (!added) {
compile_syntax_error(comp, pn, "identifier already used");
return;
}
id_info_t *id_info2 = scope_find_local_in_parent(comp->scope_cur, qst);
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)) {
compile_syntax_error(comp, pn, "no binding for nonlocal found");
return;
}
id_info->kind = ID_INFO_KIND_FREE;
scope_close_over_in_parents(comp->scope_cur, qst);
}
STATIC void compile_nonlocal_stmt(compiler_t *comp, mp_parse_node_struct_t *pns) {
if (comp->pass == MP_PASS_SCOPE) {
if (MP_PARSE_NODE_IS_LEAF(pns->nodes[0])) {
scope_declare_nonlocal(comp->scope_cur, MP_PARSE_NODE_LEAF_ARG(pns->nodes[0]));
} else {
pns = (mp_parse_node_struct_t*)pns->nodes[0];
int num_nodes = MP_PARSE_NODE_STRUCT_NUM_NODES(pns);
for (int i = 0; i < num_nodes; i++) {
scope_declare_nonlocal(comp->scope_cur, MP_PARSE_NODE_LEAF_ARG(pns->nodes[i]));
}
if (comp->scope_cur->kind == SCOPE_MODULE) {
compile_syntax_error(comp, (mp_parse_node_t)pns, "can't declare nonlocal in outer code");
return;
}
mp_parse_node_t *nodes;
int n = list_get(&pns->nodes[0], PN_name_list, &nodes);
for (int i = 0; i < n; i++) {
compile_declare_nonlocal(comp, (mp_parse_node_t)pns, MP_PARSE_NODE_LEAF_ARG(nodes[i]));
}
}
}

43
py/scope.c
View file

@ -26,7 +26,6 @@
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <assert.h>
#include "mpconfig.h"
@ -159,47 +158,9 @@ void scope_close_over_in_parents(scope_t *scope, qstr qst) {
assert(0); // we should have found the variable in one of the parents
}
void scope_declare_global(scope_t *scope, qstr qst) {
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, qst, &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, qst);
if (id_info != NULL) {
id_info->kind = ID_INFO_KIND_GLOBAL_EXPLICIT;
}
}
void scope_declare_nonlocal(scope_t *scope, qstr qst) {
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, qst, &added);
if (!added) {
printf("SyntaxError?: identifier already declared something\n");
return;
}
id_info_t *id_info2 = scope_find_local_in_parent(scope, qst);
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(qst));
return;
}
id_info->kind = ID_INFO_KIND_FREE;
scope_close_over_in_parents(scope, qst);
}
#if MICROPY_EMIT_CPYTHON
#include <stdio.h>
void scope_print_info(scope_t *s) {
if (s->kind == SCOPE_MODULE) {
printf("code <module>\n");

2
py/scope.h
View file

@ -76,6 +76,4 @@ id_info_t *scope_find(scope_t *scope, qstr qstr);
id_info_t *scope_find_global(scope_t *scope, qstr qstr);
id_info_t *scope_find_local_in_parent(scope_t *scope, qstr qstr);
void scope_close_over_in_parents(scope_t *scope, qstr qstr);
void scope_declare_global(scope_t *scope, qstr qstr);
void scope_declare_nonlocal(scope_t *scope, qstr qstr);
void scope_print_info(scope_t *s);