codegen: implement ast.NodeVisitor.visit_Constant

Since Python 3.8 visit_Num(), visit_Str() and so on are all deprecated
and replaced with visit_Constant.  We can't yet remove the deprecated
functions until we require 3.8, but we can implement visit_Constant to
silence the deprecation warnings.

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/codegen.py b/lib/codegen.py
index 62a6748c4..6955a7ada 100644
--- a/lib/codegen.py
+++ b/lib/codegen.py
@@ -401,6 +401,12 @@ class SourceGenerator(NodeVisitor):
     def visit_Num(self, node):
         self.write(repr(node.n))
 
+    def visit_Constant(self, node):
+        # Python 3.8 deprecated visit_Num(), visit_Str(), visit_Bytes(),
+        # visit_NameConstant() and visit_Ellipsis(). They can be removed once we
+        # require 3.8+.
+        self.write(repr(node.value))
+
     def visit_Tuple(self, node):
         self.write('(')
         idx = -1