Better support for 'polymorphic' JS and external arrays

test/mjsunit/polymorph-arrays.js

Index: test/mjsunit/polymorph-arrays.js
diff --git a/test/mjsunit/polymorph-arrays.js b/test/mjsunit/polymorph-arrays.js
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@@ -0,0 +1,123 @@
+// 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
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --allow-natives-syntax
+
+function init_array(a) {
+  for (var i = 0; i < 10; ++i ){
+    a[i] = i;
+  }
+}
+
+function f1(a, i) {
+  a[i+4] = a[a+5];
+  return (a[i] + a[i+1]);
+}
+
+// Check smi checks and monomorphic ICs for object arrays.
+var object_array = new Object();
+init_array(object_array);
+assertEquals(3, f1(object_array, 1));
+assertEquals(NaN, f1(1, 1));
+assertEquals(NaN, f1(object_array, new Object()));
+assertEquals(0, f1(new PixelArray(10), 1));
+
+function f2(a, i) {
+  a[i+4] = a[a+5];
+  return (a[i] + a[i+1]);
+}
+
+// Check smi checks and monomorphic ICs for JS arrays.
+var js_array = new Array();
+init_array(js_array);
+assertEquals(3, f2(js_array, 1));
+assertEquals(NaN, f2(1, 1));
+assertEquals(NaN, f2(js_array, new Object()));
+assertEquals(0, f2(new PixelArray(10), 1));
+
+function f3(a, i) {
+  a[i+4] = a[a+5];
+  return (a[i] + a[i+1]);
+}
+
+// Check smi checks and monomorphic ICs for simple external arrays.
+var int_array = new Int32Array(10);
+init_array(int_array);
+assertEquals(3, f3(int_array, 1));
+assertEquals(NaN, f3(1, 1));
+assertEquals(NaN, f3(int_array, new Object()));
+assertEquals(0, f4(new PixelArray(10), 1));
+
+function f4(a, i) {
+  a[i+4] = a[a+5];
+  return (a[i] + a[i+1]);
+}
+
+// Check smi checks for simple megamorphic array ICs.
+var int_array_2 = new Int8Array(10);
+var js_array_2 = new Array();
+var object_array_2 = new Object();
+init_array(int_array_2);
+init_array(js_array_2);
+init_array(object_array_2);
+assertEquals(3, f4(int_array_2, 1));
+assertEquals(3, f4(js_array_2, 1));
+assertEquals(3, f4(object_array_2, 1));
+assertEquals(NaN, f4(1, 1));
+assertEquals(NaN, f4(int_array, new Object()));
+assertEquals(0, f4(new PixelArray(10), 1));
+
+function f5(a, i) {
+  a[i+4] = a[a+5];
+  return (a[i] + a[i+1]);
+}
+
+// Check megamorphic array ICs that exceed the maximum allowed polymorphism
+var int8_array_3 = new Int8Array(10);
+var uint8_array_3 = new Uint8Array(10);
+var int16_array_3 = new Int16Array(10);
+var uint16_array_3 = new Uint16Array(10);
+var int32_array_3 = new Int32Array(10);
+var uint32_array_3 = new Uint32Array(10);
+var js_array_3 = new Array();
+var object_array_3 = new Object();
+init_array(int8_array_3);
+init_array(uint8_array_3);
+init_array(int16_array_3);
+init_array(uint16_array_3);
+init_array(int32_array_3);
+init_array(uint32_array_3);
+init_array(js_array_3);
+init_array(object_array_3);
+assertEquals(3, f5(int8_array_3, 1));
+assertEquals(3, f5(uint8_array_3, 1));
+assertEquals(3, f5(int16_array_3, 1));
+assertEquals(3, f5(uint16_array_3, 1));
+assertEquals(3, f5(int32_array_3, 1));
+assertEquals(3, f5(uint32_array_3, 1));
+assertEquals(3, f5(js_array_3, 1));
+assertEquals(3, f5(object_array_3, 1));