[FRONTEND] Hot fix for lineno (#481)

Override __reduce__ to make CompilationError pickable and print out error messages

python/triton/code_gen.py

@@ -654,9 +654,13 @@ class CompilationError(Exception):
         self.message = f'at {node.lineno}:{node.col_offset}:\n'
         self.message += '\n'.join(src.split('\n')[:node.lineno])
         self.message += '\n' + ' ' * node.col_offset + '^'
+        self.src = src
+        self.node = node
         super().__init__(self.message)
+
+    def __reduce__(self):
         # this is necessary to make CompilationError picklable
-        self.args = (src, node)
+        return (type(self), (self.src, self.node))
 
 
 class OutOfResources(Exception):
@@ -664,8 +668,14 @@ class OutOfResources(Exception):
         self.message = f'out of resource: {name}, '\
                        f'Required: {required}, '\
                        f'Hardware limit: {limit}'
+        self.required = required
+        self.limit = limit
+        self.name = name
         super().__init__(self.message)
-        self.args = (required, limit, name)
+
+    def __reduce__(self):
+        # this is necessary to make CompilationError picklable
+        return (type(self), (self.required, self.limit, self.name))
 
 
 class Kernel: