Generalize the Function.prototype.call hooks in the...

src/v8natives.js

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 396 matching lines @@
   }
   var body = (n > 0) ? ToString(%_Arguments(n - 1)) : '';
   var source = '(function anonymous(' + p + ') { ' + body + ' })';
 
   // The call to SetNewFunctionAttributes will ensure the prototype
   // property of the resulting function is enumerable (ECMA262, 15.3.5.2).
   return %SetNewFunctionAttributes(%CompileString(source, false)());
 };
 
 %SetCode($Function, NewFunction);
-
-
-// NOTE: The following functions (call and apply) are only used in this
-// form on the ARM platform. On IA-32 they are handled through specialized
-// builtins; see builtins-ia32.cc.
-
-%AddProperty($Function.prototype, "call", function(receiver) {
-  // Make sure the receiver of this call is a function. If it isn't
-  // we "fake" a call of it (without the right arguments) to force
-  // an exception to be thrown.
-  if (!IS_FUNCTION(this)) this();
-
-  // If receiver is null or undefined set the receiver to the global
-  // object. If the receiver isn't an object, we convert the
-  // receiver to an object.
-  if (receiver == null) receiver = global;
-  else if (!IS_OBJECT(receiver)) receiver = ToObject(receiver);
-
-  %_SetThisFunction(this);
-  %_SetThis(receiver);
-
-  var len = %_GetArgumentsLength(1);
-  return %_ShiftDownAndTailCall(len ? len - 1 : 0);
-}, DONT_ENUM);
-
-
-// This implementation of Function.prototype.apply replaces the stack frame
-// of the apply call with the new stack frame containing the arguments from
-// the args array.
-%AddProperty($Function.prototype, "apply", function(receiver, args) {
-  var length = (args == null) ? 0 : ToUint32(args.length);
-
-  // We can handle any number of apply arguments if the stack is
-  // big enough, but sanity check the value to avoid overflow when
-  // multiplying with pointer size.
-  if (length > 0x800000) {
-    throw new $RangeError(
-        "Function.prototype.apply cannot support " + length + " arguments.");
-  }
-
-  if (!IS_FUNCTION(this)) {
-    throw new $TypeError('Function.prototype.apply was called on ' + this.toString() + ', which is a ' + (typeof this) + ' and not a function');
-  }
-
-  // Make sure args has the right type.
-  if (args != null && %ClassOf(args) !== 'Array' && %ClassOf(args) !== 'Arguments') {
-    throw new $TypeError('Function.prototype.apply: args has wrong type');
-  }
-
-  // If receiver is null or undefined set the receiver to the global
-  // object. If the receiver isn't an object, we convert the
-  // receiver to an object.
-  if (receiver == null) receiver = global;
-  else if (!IS_OBJECT(receiver)) receiver = ToObject(receiver);
-
-  %_SetThisFunction(this);
-  %_SetThis(receiver);
-
-  var arguments_length = %_GetArgumentsLength(2);
-
-  // This method has 2 formal arguments so if less are passed, then space has
-  // been made.
-  if (arguments_length < 2)
-    arguments_length = 2;
-
-  // Move some stuff to locals so they don't get overwritten when we start
-  // expanding the args array.
-  var saved_args = args;
-
-  if (arguments_length > length) {
-    // We have too many arguments - we need to squash the frame.
-    %_SquashFrame(arguments_length, length);
-  } else if (arguments_length != length) {
-    // We have too few spaces for arguments - we need to expand the frame.
-    if (!%_ExpandFrame(arguments_length, length)) {
-      throw new $RangeError(
-          "Function.prototype.apply cannot find stack space for " + length + " arguments.");
-    }
-    // GC doesn't like junk in the arguments!
-    for (var i = 0; i < length; i++) {
-      %_SetArgument(i, 0, length);
-    }
-  }
-
-  // Update-number-of-arguments field to keep things looking consistent for
-  // stack traces, and uses of arguments or arguments.length.
-  %_SetArgumentsLength(length);
-
-  // NOTE: For the fast case this should be implemented in assembler,
-  // which would allow us to omit bounds and class checks galore.  The
-  // assembler version could fall back to this implementation if
-  // tricky stuff is found, like arrays implemented as dictionaries or
-  // holes in arrays.
-  for (var i = 0; i < length; i++) {
-    %_SetArgument(i, saved_args[i], length);
-  }
-
-  // Replaces the current frame with the new call.  This has the added effect
-  // of removing apply from the stack trace entirely, which matches the
-  // behaviour of Firefox.
-  return %_TailCallWithArguments(length);
-}, DONT_ENUM);
-
-