Changed fuzzer to randomly remove half of the arguments when running...

test/mjsunit/fuzz-natives.js

 // Copyright 2008 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax
 
+var RUN_WITH_ALL_ARGUMENT_ENTRIES = false;
+var kOnManyArgumentsRemove = 5;
+
 function makeArguments() {
   var result = [ ];
   result.push(17);
   result.push(-31);
   result.push(new Array(100));
   result.push(new Array(100003));
   result.push(Number.MIN_VALUE);
   result.push("whoops");
   result.push("x");
   result.push({"x": 1, "y": 2});
@@ skipping 27 matching lines @@
     }
   }
 }
 
 function testArgumentTypes(name, argc) {
   var type = 0;
   var hasMore = true;
   var func = makeFunction(name, argc);
   while (hasMore) {
     var argPool = makeArguments();
+    // When we have 5 or more arguments we lower the amount of tests cases
+    // by randomly removing kOnManyArgumentsRemove entries
+    var numArguments = RUN_WITH_ALL_ARGUMENT_ENTRIES ?
+      kArgObjects : kArgObjects-kOnManyArgumentsRemove;
+    if (argc >= 5 && !RUN_WITH_ALL_ARGUMENT_ENTRIES) {
+      for (var i = 0; i < kOnManyArgumentsRemove; i++) {
+        var rand = Math.floor(Math.random() * (kArgObjects - i));
+        argPool.splice(rand,1);

[Mads Ager (chromium), 2010/02/09 12:04:14]

nit: add a space after the comma.

+      }
+    }
     var current = type;
     var hasMore = false;
     var argList = [ ];
     for (var i = 0; i < argc; i++) {
-      var index = current % kArgObjects;
-      current = (current / kArgObjects) << 0;
-      if (index != (kArgObjects - 1))
+      var index = current % numArguments;
+      current = (current / numArguments) << 0;
+      if (index != (numArguments - 1))
         hasMore = true;
       argList.push(argPool[index]);
     }
     try {
       func.apply(void 0, argList);
     } catch (e) {
       // we don't care what happens as long as we don't crash
     }
     type++;
   }
@@ skipping 56 matching lines @@
     if (name in knownProblems || name in currentlyUncallable)
       continue;
     print(name);
     var argc = nativeInfo[1];
     testArgumentCount(name);
     testArgumentTypes(name, argc);
   }
 }
 
 testNatives();