Add constant for maximum stack size

src/script/interpreter.cpp

@@ -1028,7 +1028,7 @@ bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript&
             }
 
             // Size limits
-            if (stack.size() + altstack.size() > 1000)
+            if (stack.size() + altstack.size() > MAX_STACK_SIZE)
                 return set_error(serror, SCRIPT_ERR_STACK_SIZE);
         }
     }

src/script/script.h

@@ -30,6 +30,9 @@ static const int MAX_PUBKEYS_PER_MULTISIG = 20;
 // Maximum script length in bytes
 static const int MAX_SCRIPT_SIZE = 10000;
 
+// Maximum number of values on script interpreter stack
+static const int MAX_STACK_SIZE = 1000;
+
 // Threshold for nLockTime: below this value it is interpreted as block number,
 // otherwise as UNIX timestamp.
 static const unsigned int LOCKTIME_THRESHOLD = 500000000; // Tue Nov  5 00:53:20 1985 UTC