A64: Synchronize with r15545.

test/webkit/dfg-dead-variable-on-exit.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions
 // are met:
 // 1.  Redistributions of source code must retain the above copyright
 //     notice, this list of conditions and the following disclaimer.
 // 2.  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.
 //
 // THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
 
 description(
-"Tests the behavior of Array.prototype.concat while the array is having a bad time due to one of the elements we are concatenating."
+"This tests that if a variable is dead on OSR exit, it will at least contain a valid JS value."
 );
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
+var array = [];
 
+for (var i = 0; i < 9; ++i) {
+    var code = "";
+    code += "(function(";
+    for (var j = 0; j < i; ++j) {
+        if (j)
+            code += ", ";
+        code += "arg" + j;
+    }
+    code += ") {\n";
+    code += "    return ";
+    if (i) {
+        for (var j = 0; j < i; ++j) {
+            if (j)
+                code += " + ";
+            code += "arg" + j;
+        }
+    } else
+        code += "void 0";
+    code += ";\n";
+    code += "})";
+    array[i] = eval(code);
+}
 
+function foo(a, b) {
+    var x = 0;
+    if (a.f < b.f) {
+        var result = b.g - a.g;
+        x = !x;
+        return result;
+    } else {
+        var result = a.g - b.g;
+        x = [x];
+        return result;
+    }
+}
+
+var firstArg = {f:2, g:3};
+var secondArg = {f:3, g:4};
+
+for (var i = 0; i < 300; ++i) {
+    var code = "";
+    code += "array[" + (((i / 2) | 0) % array.length) + "](";
+    for (var j = 0; j < (((i / 2) | 0) % array.length); ++j) {
+        if (j)
+            code += ", ";
+        code += i + j;
+    }
+    if (i == 150) {
+        firstArg = {f:2, g:2.5};
+        secondArg = {f:3, g:3.5};
+    }
+    var tmp = firstArg;
+    firstArg = secondArg;
+    secondArg = tmp;
+    code += "); foo(firstArg, secondArg)";
+    shouldBe(code, "1");
+}
+