Fix for SF [ 734869 ] Lambda functions in list comprehensions
The compiler was reseting the list comprehension tmpname counter for each function, but the symtable was using the same counter for the entire module. Repair by move tmpname into the symtable entry.
Bugfix candidate.
diff --git a/Python/compile.c b/Python/compile.c
index a98b905..76a3711 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -731,6 +731,7 @@
static void symtable_import(struct symtable *, node *);
static void symtable_assign(struct symtable *, node *, int);
static void symtable_list_comprehension(struct symtable *, node *);
+static void symtable_list_for(struct symtable *, node *);
static int symtable_update_free_vars(struct symtable *);
static int symtable_undo_free(struct symtable *, PyObject *, PyObject *);
@@ -1602,6 +1603,8 @@
{
/* listmaker: test list_for */
char tmpname[30];
+
+ REQ(n, listmaker);
PyOS_snprintf(tmpname, sizeof(tmpname), "_[%d]", ++c->c_tmpname);
com_addoparg(c, BUILD_LIST, 0);
com_addbyte(c, DUP_TOP); /* leave the result on the stack */
@@ -4921,7 +4924,6 @@
st->st_cur = NULL;
st->st_nscopes = 0;
st->st_errors = 0;
- st->st_tmpname = 0;
st->st_private = NULL;
return st;
fail:
@@ -5123,9 +5125,6 @@
if (st->st_cur) {
prev = st->st_cur;
if (PyList_Append(st->st_stack, (PyObject *)st->st_cur) < 0) {
- /* Py_DECREF(st->st_cur); */
- /* I believe the previous line would lead to a
- double-DECREF when st is disposed - JRH */
st->st_errors++;
return;
}
@@ -5395,12 +5394,12 @@
}
goto loop;
case list_iter:
+ /* only occurs when there are multiple for loops
+ in a list comprehension */
n = CHILD(n, 0);
- if (TYPE(n) == list_for) {
- st->st_tmpname++;
- symtable_list_comprehension(st, n);
- st->st_tmpname--;
- } else {
+ if (TYPE(n) == list_for)
+ symtable_list_for(st, n);
+ else {
REQ(n, list_if);
symtable_node(st, CHILD(n, 1));
if (NCH(n) == 3) {
@@ -5428,10 +5427,7 @@
/* fall through */
case listmaker:
if (NCH(n) > 1 && TYPE(CHILD(n, 1)) == list_for) {
- st->st_tmpname++;
- symtable_list_comprehension(st, CHILD(n, 1));
- symtable_node(st, CHILD(n, 0));
- st->st_tmpname--;
+ symtable_list_comprehension(st, n);
break;
}
/* fall through */
@@ -5629,10 +5625,23 @@
static void
symtable_list_comprehension(struct symtable *st, node *n)
{
+ /* listmaker: test list_for */
char tmpname[30];
- PyOS_snprintf(tmpname, sizeof(tmpname), "_[%d]", st->st_tmpname);
+ REQ(n, listmaker);
+ PyOS_snprintf(tmpname, sizeof(tmpname), "_[%d]",
+ ++st->st_cur->ste_tmpname);
symtable_add_def(st, tmpname, DEF_LOCAL);
+ symtable_list_for(st, CHILD(n, 1));
+ symtable_node(st, CHILD(n, 0));
+ --st->st_cur->ste_tmpname;
+}
+
+static void
+symtable_list_for(struct symtable *st, node *n)
+{
+ REQ(n, list_for);
+ /* list_for: for v in expr [list_iter] */
symtable_assign(st, CHILD(n, 1), 0);
symtable_node(st, CHILD(n, 3));
if (NCH(n) == 5)