Custom call IC for String.fromCharCode.

test/mjsunit/string-fromcharcode.js

+// Copyright 2010 the V8 project authors. All rights reserved.
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+// modification, are permitted provided that the following conditions are
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+// 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));
+}