xdrgen: Track constant values

In order to compute the numeric on-the-wire width of XDR types,
xdrgen needs to keep track of the numeric value of constants that
are defined in the input specification so it can perform
calculations with those values.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

tools/net/sunrpc/xdrgen/xdr_ast.py

@@ -19,6 +19,8 @@ public_apis = []
 structs = set()
 pass_by_reference = set()
 
+constants = {}
+
 
 @dataclass
 class _XdrAst(ast_utils.Ast):
@@ -156,6 +158,10 @@ class _XdrConstant(_XdrAst):
     name: str
     value: str
 
+    def __post_init__(self):
+        if self.value not in constants:
+            constants[self.name] = int(self.value, 0)
+
 
 @dataclass
 class _XdrEnumerator(_XdrAst):
@@ -164,6 +170,10 @@ class _XdrEnumerator(_XdrAst):
     name: str
     value: str
 
+    def __post_init__(self):
+        if self.value not in constants:
+            constants[self.name] = int(self.value, 0)
+
 
 @dataclass
 class _XdrEnum(_XdrAst):