test/mjsunit/fuzz-natives.js

// Copyright 2008 the V8 project authors. All rights reserved.
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//
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// 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});
  var slowCaseObj = {"a": 3, "b": 4, "c": 5};
  delete slowCaseObj.c;
  result.push(slowCaseObj);
  result.push(function () { return 8; });
  return result;
}

var kArgObjects = makeArguments().length;

function makeFunction(name, argc) {
  var args = [];
  for (var i = 0; i < argc; i++)
    args.push("x" + i);
  var argsStr = args.join(", ");
  return new Function(args.join(", "), "return %" + name + "(" + argsStr + ");");
}

function testArgumentCount(name, argc) {
  for (var i = 0; i < 10; i++) {
    var func = null;
    try {
      func = makeFunction(name, i);
    } catch (e) {
      if (e != "SyntaxError: Illegal access") throw e;
    }
    if (func === null && i == argc) {
      throw "unexpected exception";
    }
    var args = [ ];
    for (var j = 0; j < i; j++)
      args.push(0);
    try {
      func.apply(void 0, args);
    } catch (e) {
      // we don't care what happens as long as we don't crash
    }
  }
}

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);
      }
    }
    var current = type;
    var hasMore = false;
    var argList = [ ];
    for (var i = 0; i < argc; i++) {
      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++;
  }
}

var knownProblems = {
  "Abort": true,

  // Avoid calling the concat operation, because weird lengths
  // may lead to out-of-memory.
  "StringBuilderConcat": true,

  // These functions use pseudo-stack-pointers and are not robust
  // to unexpected integer values.
  "DebugEvaluate": true,

  // These functions do nontrivial error checking in recursive calls,
  // which means that we have to propagate errors back.
  "SetFunctionBreakPoint": true,
  "SetScriptBreakPoint": true,
  "ChangeBreakOnException": true,
  "PrepareStep": true,

  // Too slow.
  "DebugReferencedBy": true,

  // Calling disable/enable access checks may interfere with the
  // the rest of the tests.
  "DisableAccessChecks": true,
  "EnableAccessChecks": true,

  // These functions should not be callable as runtime functions.
  "NewContext": true,
  "NewArgumentsFast": true,
  "PushContext": true,
  "LazyCompile": true,
  "CreateObjectLiteralBoilerplate": true,
  "CloneLiteralBoilerplate": true,
  "CloneShallowLiteralBoilerplate": true,
  "CreateArrayLiteralBoilerplate": true,
  "IS_VAR": true,
  "ResolvePossiblyDirectEval": true,
  "Log": true,
  "DeclareGlobals": true,

  "PromoteScheduledException": true,
  "DeleteHandleScopeExtensions": true,

  // That can only be invoked on Array.prototype.
  "FinishArrayPrototypeSetup": true,

  "_SwapElements": true,

  // Performance critical function which cannot afford type checks.
  "_CallFunction": true,

  // Tries to allocate based on argument, and (correctly) throws
  // out-of-memory if the request is too large. In practice, the
  // size will be the number of captures of a RegExp.
  "RegExpConstructResult": true,
  "_RegExpConstructResult": true,

  // This function performs some checks compile time (it requires its first
  // argument to be a compile time smi).
  "_GetFromCache": true,

  // This function expects its first argument to be a non-smi.
  "_IsStringWrapperSafeForDefaultValueOf" : true,

  // Only applicable to strings.
  "_HasCachedArrayIndex": true,
  "_GetCachedArrayIndex": true
};

var currentlyUncallable = {
  // We need to find a way to test this without breaking the system.
  "SystemBreak": true
};

function testNatives() {
  var allNatives = %ListNatives();
  for (var i = 0; i < allNatives.length; i++) {
    var nativeInfo = allNatives[i];
    var name = nativeInfo[0];
    if (name in knownProblems || name in currentlyUncallable)
      continue;
    print(name);
    var argc = nativeInfo[1];
    testArgumentCount(name, argc);
    testArgumentTypes(name, argc);
  }
}

testNatives();