Fix parsing floats with very large exponents

Author: msimacek

graalpython/com.oracle.graal.python.test/src/tests/test_float.py

@@ -1,4 +1,4 @@
-# Copyright (c) 2018, 2023, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2018, 2024, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # The Universal Permissive License (UPL), Version 1.0
@@ -281,6 +281,9 @@ def test_compare_infinite(self):
             self.assertFalse(num < ninf)
             self.assertFalse(num <= ninf)
 
+    def test_too_large_exponent(self):
+        self.assertEqual(float(9.6652344473471409e+13020482957104346813665225475455405808065502685256002111130525326263065544707062128277904331411231482727389186536355106830667631510992459549990606158658919), float('inf'))
+
 
 fromHex = float.fromhex
 

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/floats/FloatUtils.java

@@ -239,7 +239,11 @@ public static StringToDoubleResult stringToDouble(String str, int start, int len
     public static double parseValidString(String substr) {
         double d = Double.parseDouble(substr);
         if (!Double.isFinite(d)) {
-            d = new BigDecimal(substr).doubleValue();
+            try {
+                d = new BigDecimal(substr).doubleValue();
+            } catch (NumberFormatException e) {
+                // Can happen when the number is too large, just let it return +-infinity then
+            }
         }
         return d;
     }