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      1 // Copyright 2011 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 // Flags: --allow-natives-syntax --always-compact --expose-gc
     29 
     30 var O = { get f() { return 0; } };
     31 
     32 var CODE = [];
     33 
     34 var R = [];
     35 
     36 function Allocate4Kb(N) {
     37   var arr = [];
     38   do {arr.push(new Array(1024));} while (--N > 0);
     39   return arr;
     40 }
     41 
     42 function AllocateXMb(X) {
     43   return Allocate4Kb((1024 * X) / 4);
     44 }
     45 
     46 function Node(v, next) { this.v = v; this.next = next; }
     47 
     48 Node.prototype.execute = function (O) {
     49   var n = this;
     50   while (n.next !== null) n = n.next;
     51   n.v(O);
     52 };
     53 
     54 function LongList(N, x) {
     55   if (N == 0) return new Node(x, null);
     56   return new Node(new Array(1024), LongList(N - 1, x));
     57 }
     58 
     59 var L = LongList(1024, function (O) {
     60   for (var i = 0; i < 5; i++) O.f;
     61 });
     62 
     63 
     64 
     65 %NeverOptimizeFunction(Incremental);
     66 function Incremental(O, x) {
     67   if (!x) {
     68     return;
     69   }
     70   function CreateCode(i) {
     71     var f = new Function("return O.f_" + i);
     72     CODE.push(f);
     73     f(); // compile
     74     f(); // compile
     75     f(); // compile
     76   }
     77 
     78   for (var i = 0; i < 1e4; i++) CreateCode(i);
     79   gc();
     80   gc();
     81   gc();
     82 
     83   print(">>> 1 <<<");
     84 
     85   L.execute(O);
     86 
     87   L = null;
     88   print(">>> 2 <<<");
     89   AllocateXMb(8);
     90  //rint("1");
     91  //llocateXMb(8);
     92  //rint("1");
     93  //llocateXMb(8);
     94 
     95 }
     96 
     97 function foo(O, x) {
     98   Incremental(O, x);
     99 
    100   print('f');
    101 
    102   for (var i = 0; i < 5; i++) O.f;
    103 
    104 
    105   print('g');
    106 
    107   bar(x);
    108 }
    109 
    110 function bar(x) {
    111   if (!x) return;
    112   %DeoptimizeFunction(foo);
    113   AllocateXMb(8);
    114   AllocateXMb(8);
    115 }
    116 
    117 var O1 = {};
    118 var O2 = {};
    119 var O3 = {};
    120 var O4 = {f:0};
    121 
    122 foo(O1, false);
    123 foo(O2, false);
    124 foo(O3, false);
    125 %OptimizeFunctionOnNextCall(foo);
    126 foo(O4, true);
    127