languages/cpython
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Check the return values for all functions returning an ast node.

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Failure to do it may result in strange error messages or even crashes,
in admittedly convoluted cases that are normally syntax errors, like:
    def f(*xx, __debug__): pass
This commit is contained in:
Amaury Forgeot d'Arc 2010-08-19 17:43:15 +00:00
parent 5c1808a1a8
commit 92dc80a8d8
1 changed files with 27 additions and 26 deletions
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53
Python/ast.c
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@ -688,6 +688,8 @@ handle_keywordonly_args(struct compiling *c, const node *n, int start,
case tfpdef:
if (i + 1 < NCH(n) && TYPE(CHILD(n, i + 1)) == EQUAL) {
expression = ast_for_expr(c, CHILD(n, i + 2));
if (!expression)
goto error;
asdl_seq_SET(kwdefaults, j, expression);
i += 2; /* '=' and test */
}
@ -697,10 +699,8 @@ handle_keywordonly_args(struct compiling *c, const node *n, int start,
if (NCH(ch) == 3) {
/* ch is NAME ':' test */
annotation = ast_for_expr(c, CHILD(ch, 2));
if (!annotation) {
ast_error(ch, "expected expression");
if (!annotation)
goto error;
}
}
else {
annotation = NULL;
@ -794,22 +794,22 @@ ast_for_arguments(struct compiling *c, const node *n)
}
posargs = (nposargs ? asdl_seq_new(nposargs, c->c_arena) : NULL);
if (!posargs && nposargs)
goto error;
return NULL;
kwonlyargs = (nkwonlyargs ?
asdl_seq_new(nkwonlyargs, c->c_arena) : NULL);
if (!kwonlyargs && nkwonlyargs)
goto error;
return NULL;
posdefaults = (nposdefaults ?
asdl_seq_new(nposdefaults, c->c_arena) : NULL);
if (!posdefaults && nposdefaults)
goto error;
return NULL;
/* The length of kwonlyargs and kwdefaults are same
since we set NULL as default for keyword only argument w/o default
- we have sequence data structure, but no dictionary */
kwdefaults = (nkwonlyargs ?
asdl_seq_new(nkwonlyargs, c->c_arena) : NULL);
if (!kwdefaults && nkwonlyargs)
goto error;
return NULL;
if (nposargs + nkwonlyargs > 255) {
ast_error(n, "more than 255 arguments");
@ -833,7 +833,7 @@ ast_for_arguments(struct compiling *c, const node *n)
if (i + 1 < NCH(n) && TYPE(CHILD(n, i + 1)) == EQUAL) {
expr_ty expression = ast_for_expr(c, CHILD(n, i + 2));
if (!expression)
goto error;
return NULL;
assert(posdefaults != NULL);
asdl_seq_SET(posdefaults, j++, expression);
i += 2;
@ -842,11 +842,11 @@ ast_for_arguments(struct compiling *c, const node *n)
else if (found_default) {
ast_error(n,
"non-default argument follows default argument");
goto error;
return NULL;
}
arg = compiler_arg(c, ch);
if (!arg)
goto error;
return NULL;
asdl_seq_SET(posargs, k++, arg);
i += 2; /* the name and the comma */
break;
@ -854,7 +854,7 @@ ast_for_arguments(struct compiling *c, const node *n)
if (i+1 >= NCH(n)) {
ast_error(CHILD(n, i),
"named arguments must follow bare *");
goto error;
return NULL;
}
ch = CHILD(n, i+1); /* tfpdef or COMMA */
if (TYPE(ch) == COMMA) {
@ -862,7 +862,7 @@ ast_for_arguments(struct compiling *c, const node *n)
i += 2; /* now follows keyword only arguments */
res = handle_keywordonly_args(c, n, i,
kwonlyargs, kwdefaults);
if (res == -1) goto error;
if (res == -1) return NULL;
i = res; /* res has new position to process */
}
else {
@ -874,6 +874,8 @@ ast_for_arguments(struct compiling *c, const node *n)
if (NCH(ch) > 1) {
/* there is an annotation on the vararg */
varargannotation = ast_for_expr(c, CHILD(ch, 2));
if (!varargannotation)
return NULL;
}
i += 3;
if (i < NCH(n) && (TYPE(CHILD(n, i)) == tfpdef
@ -881,7 +883,7 @@ ast_for_arguments(struct compiling *c, const node *n)
int res = 0;
res = handle_keywordonly_args(c, n, i,
kwonlyargs, kwdefaults);
if (res == -1) goto error;
if (res == -1) return NULL;
i = res; /* res has new position to process */
}
}
@ -893,26 +895,24 @@ ast_for_arguments(struct compiling *c, const node *n)
if (NCH(ch) > 1) {
/* there is an annotation on the kwarg */
kwargannotation = ast_for_expr(c, CHILD(ch, 2));
if (!kwargannotation)
return NULL;
}
if (!kwarg)
goto error;
return NULL;
if (forbidden_name(kwarg, CHILD(ch, 0), 0))
goto error;
return NULL;
i += 3;
break;
default:
PyErr_Format(PyExc_SystemError,
"unexpected node in varargslist: %d @ %d",
TYPE(ch), i);
goto error;
return NULL;
}
}
return arguments(posargs, vararg, varargannotation, kwonlyargs, kwarg,
kwargannotation, posdefaults, kwdefaults, c->c_arena);
error:
Py_XDECREF(vararg);
Py_XDECREF(kwarg);
return NULL;
}
static expr_ty
@ -997,9 +997,9 @@ ast_for_decorators(struct compiling *c, const node *n)
for (i = 0; i < NCH(n); i++) {
d = ast_for_decorator(c, CHILD(n, i));
if (!d)
return NULL;
asdl_seq_SET(decorator_seq, i, d);
if (!d)
return NULL;
asdl_seq_SET(decorator_seq, i, d);
}
return decorator_seq;
}
@ -1027,7 +1027,7 @@ ast_for_funcdef(struct compiling *c, const node *n, asdl_seq *decorator_seq)
if (TYPE(CHILD(n, name_i+2)) == RARROW) {
returns = ast_for_expr(c, CHILD(n, name_i + 3));
if (!returns)
return NULL;
return NULL;
name_i += 2;
}
body = ast_for_suite(c, CHILD(n, name_i + 3));
@ -2136,11 +2136,10 @@ ast_for_expr_stmt(struct compiling *c, const node *n)
return NULL;
}
e = ast_for_testlist(c, ch);
/* set context to assign */
if (!e)
return NULL;
/* set context to assign */
if (!set_context(c, e, Store, CHILD(n, i)))
return NULL;
@ -2960,6 +2959,8 @@ ast_for_with_item(struct compiling *c, const node *n, asdl_seq *content)
REQ(n, with_item);
context_expr = ast_for_expr(c, CHILD(n, 0));
if (!context_expr)
return NULL;
if (NCH(n) == 3) {
optional_vars = ast_for_expr(c, CHILD(n, 2));