Custom call IC for String.fromCharCode.

test/mjsunit/string-fromcharcode.js

Index: test/mjsunit/string-fromcharcode.js
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+// Copyright 2010 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.
+
+// Test String.fromCharCode.
+
+
+// Test various receivers and arguments passed to String.fromCharCode.
+
+Object.prototype.fromCharCode = function(x) { return this; };
+
+var fcc = String.fromCharCode;
+var fcc2 = fcc;
+
+function constFun(x) { return function(y) { return x; }; }
+
+function test(num) {
+  assertEquals(" ", String.fromCharCode(0x20));
+  assertEquals(" ", String.fromCharCode(0x20 + 0x10000));
+  assertEquals(" ", String.fromCharCode(0x20 - 0x10000));
+  assertEquals(" ", String.fromCharCode(0x20 + 0.5));
+
+  assertEquals("\u1234", String.fromCharCode(0x1234));
+  assertEquals("\u1234", String.fromCharCode(0x1234 + 0x10000));
+  assertEquals("\u1234", String.fromCharCode(0x1234 - 0x10000));
+  assertEquals("\u1234", String.fromCharCode(0x1234 + 0.5));
+
+  assertEquals("  ", String.fromCharCode(0x20, 0x20));
+  assertEquals("  ", String.fromCharCode(0x20 + 0.5, 0x20));
+
+  assertEquals(" ", fcc(0x20));
+  assertEquals(" ", fcc(0x20 + 0x10000));
+  assertEquals(" ", fcc(0x20 - 0x10000));
+  assertEquals(" ", fcc(0x20 + 0.5));
+
+  assertEquals("\u1234", fcc(0x1234));
+  assertEquals("\u1234", fcc(0x1234 + 0x10000));
+  assertEquals("\u1234", fcc(0x1234 - 0x10000));
+  assertEquals("\u1234", fcc(0x1234 + 0.5));
+
+  assertEquals("  ", fcc(0x20, 0x20));
+  assertEquals("  ", fcc(0x20 + 0.5, 0x20));
+
+  var receiver = (num < 5) ? String : (num < 9) ? "dummy" : 42;
+  fcc2 = (num < 5) ? fcc : (num < 9) ? constFun("dummy") : constFun(42);
+  var expected = (num < 5) ? " " : (num < 9) ? "dummy" : 42;
+  assertEquals(expected, receiver.fromCharCode(0x20));
+  assertEquals(expected, receiver.fromCharCode(0x20 - 0x10000));
+  assertEquals(expected, receiver.fromCharCode(0x20 + 0.5));
+  assertEquals(expected, fcc2(0x20));
+  assertEquals(expected, fcc2(0x20 - 0x10000));
+  assertEquals(expected, fcc2(0x20 + 0.5));
+}
+
+// Use loop to test the custom IC.
+for (var i = 0; i < 10; i++) {
+  test(i);
+}
+
+
+// Test the custom IC works correctly when the map changes.
+for (var i = 0; i < 10; i++) {
+  var expected = (i < 5) ? " " : 42;
+  if (i == 5) String.fromCharCode = function() { return 42; };
+  assertEquals(expected, String.fromCharCode(0x20));
+}