Inline mathematical constants

test/mjsunit/compiler/math-constants.js

+// Copyright 2014 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 --noalways-opt
+
+var globalObject = new Function("return this")();
+//Cache the original Math object for re-optimizations
+var mathObject = Math;
+var NOT_OPTIMIZED = 2;
+var OPTIMIZED = 1;
+
+function getPi() {
+    return Math.PI;
+}
+
+function optimizeGetPi() {
+    assertUnoptimized(getPi);
+    var pi = getPi();
+    getPi();
+    %OptimizeFunctionOnNextCall(getPi);
+    getPi();
+    assertOptimized(getPi);
+    //Optimized result must always be equal to the unoptimized result
+    assertEquals(pi, getPi());
+}
+
+
+optimizeGetPi();
+assertOptimized(getPi);
+//normal assignment should deoptimize
+Math = {PI: 1.24};
+assertUnoptimized(getPi);
+assertEquals(getPi(), 1.24);
+Math = mathObject;
+
+
+optimizeGetPi();
+assertOptimized(getPi);
+//delete should deoptimize
+delete Math;
+assertUnoptimized(getPi);
+try {
+    getPi();
+    assertTrue(false);
+}
+catch(e) {
+    assertTrue(true);
+}
+Math = mathObject;
+
+
+optimizeGetPi();
+assertOptimized(getPi);
+//defining accessor descriptor should deoptimize
+Object.defineProperty(globalObject, "Math", {
+    get: function() {
+        return {PI: 1.24};
+    },
+    set: function(value) {
+        Object.defineProperty(globalObject, "Math", {
+            value: value,
+            enumerable: true,
+            writable: true,
+            configurable: true
+        });
+    },
+    configurable: true,
+    enumerable: true
+});
+assertUnoptimized(getPi);
+assertEquals(getPi(), 1.24);
+Math = mathObject;
+
+optimizeGetPi();
+assertOptimized(getPi);
+//defining data descriptor should deoptimize
+Object.defineProperty(globalObject, "Math", {
+    value: {PI: 1.24},
+    configurable: true,
+    enumerable: true,
+    writable: true
+});
+assertUnoptimized(getPi);
+assertEquals(getPi(), 1.24);
+Math = mathObject;
+
+
+optimizeGetPi();
+assertOptimized(getPi);