d8 external array c'tors: allow parameters that can be converted to numbers

test/mjsunit/external-array.js

 // Copyright 2011 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 63 matching lines @@
 assertEquals(3.5, array[1]);
 for (var i = 0; i < 5; i++) {
   assertEquals(2.5, get(array, 0));
   assertEquals(3.5, array[1]);
 }
 %OptimizeFunctionOnNextCall(get);
 assertEquals(2.5, get(array, 0));
 assertEquals(3.5, get(array, 1));
 }
 
+// Test non-number parameters.
+var array_with_length_from_non_number = new Int32Array("2");
+assertEquals(2, array_with_length_from_non_number.length);
+array_with_length_from_non_number = new Int32Array(undefined);
+assertEquals(0, array_with_length_from_non_number.length);
+var foo = { valueOf: function() { return 3; } };
+array_with_length_from_non_number = new Int32Array(foo);
+assertEquals(3, array_with_length_from_non_number.length);
+foo = { toString: function() { return "4"; } };
+array_with_length_from_non_number = new Int32Array(foo);
+assertEquals(4, array_with_length_from_non_number.length);
+
+
 // Test loads and stores.
 types = [Array, Int8Array, Uint8Array, Int16Array, Uint16Array, Int32Array,
          Uint32Array, PixelArray, Float32Array, Float64Array];
 
 test_result_nan = [NaN, 0, 0, 0, 0, 0, 0, 0, NaN, NaN];
 test_result_low_int = [-1, -1, 255, -1, 65535, -1, 0xFFFFFFFF, 0, -1, -1];
 test_result_low_double = [-1.25, -1, 255, -1, 65535, -1, 0xFFFFFFFF, 0, -1.25, -1.25];
 test_result_middle = [253.75, -3, 253, 253, 253, 253, 253, 254, 253.75, 253.75];
 test_result_high_int = [256, 0, 0, 256, 256, 256, 256, 255, 256, 256];
 test_result_high_double = [256.25, 0, 0, 256, 256, 256, 256, 255, 256.25, 256.25];
@@ skipping 159 matching lines @@
     return a[0] = a[0] = 1;
   }
 
   array_load_set_smi_check2(a);
   %OptimizeFunctionOnNextCall(array_load_set_smi_check2);
   array_load_set_smi_check2(a);
   array_load_set_smi_check2(0);
   %DeoptimizeFunction(array_load_set_smi_check2);
   gc();  // Makes V8 forget about type information for array_load_set_smi_check.
 }