[PATCH] Python interface: actually raise error on non-object error return

[skim...@kotnet.org]

From: Sven Verdoolaege <sv...@cerebras.net>

When a C function returning a char *, an isl_stat, isl_bool, isl_size
or type enum returns an error condition, the Python interface
is meant to raise an error, but the generated code
would try to re-raise some (non-existent) caught exception instead.
Actually raise an error.

Reported-by: Matthew Fernandez <matt.fe...@cerebras.net>
Signed-off-by: Sven Verdoolaege <sv...@cerebras.net>
---
interface/python.cc | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/interface/python.cc b/interface/python.cc
index 686bcc71b9..dd78c42a9b 100644
--- a/interface/python.cc
+++ b/interface/python.cc
@@ -413,7 +413,7 @@ void python_generator::print_method_return(int indent, const isl_class &clazz,
print_indent(indent, "return obj\n");
} else if (is_string(return_type)) {
print_indent(indent, "if res == 0:\n");
- print_indent(indent, " raise\n");
+ print_indent(indent, " raise Error\n");
print_indent(indent, "string = "
"cast(res, c_char_p).value.decode('ascii')\n");

@@ -423,7 +423,7 @@ void python_generator::print_method_return(int indent, const isl_class &clazz,
print_indent(indent, "return string\n");
} else if (is_isl_neg_error(return_type)) {
print_indent(indent, "if res < 0:\n");
- print_indent(indent, " raise\n");
+ print_indent(indent, " raise Error\n");
if (is_isl_bool(return_type))
print_indent(indent, "return bool(res)\n");
else if (is_isl_size(return_type))
@@ -867,7 +867,8 @@ void python_generator::print_method_type(FunctionDecl *fd)
* if it is one of those type subclasses, then print a __new__ method.
*
* In the superclass, the __new__ method constructs an object
- * of the subclass type specified by the type function.
+ * of the subclass type specified by the type function,
+ * raising an error on an error type.
* In the subclass, the __new__ method reverts to the original behavior.
*/
void python_generator::print_new(const isl_class &clazz,
@@ -891,7 +892,7 @@ void python_generator::print_new(const isl_class &clazz,
printf(" return %s(**keywords)\n",
type2python(i->second).c_str());
}
- printf(" raise\n");
+ printf(" raise Error\n");
}

printf(" return super(%s, cls).__new__(cls)\n",
--
2.25.1