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      1 // Copyright 2013 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: --fold-constants --nodead-code-elimination
     29 // Flags: --expose-gc --allow-natives-syntax
     30 // Flags: --concurrent-recompilation --block-concurrent-recompilation
     31 
     32 if (!%IsConcurrentRecompilationSupported()) {
     33   print("Concurrent recompilation is disabled. Skipping this test.");
     34   quit();
     35 }
     36 
     37 function test(fun) {
     38   fun();
     39   fun();
     40   // Mark for concurrent optimization.
     41   %OptimizeFunctionOnNextCall(fun, "concurrent");
     42   // Kick off recompilation.
     43   fun();
     44   // Tenure cons string after compile graph has been created.
     45   gc();
     46   // In the mean time, concurrent recompiling is still blocked.
     47   assertUnoptimized(fun, "no sync");
     48   // Let concurrent recompilation proceed.
     49   %UnblockConcurrentRecompilation();
     50   // Concurrent recompilation eventually finishes, embeds tenured cons string.
     51   assertOptimized(fun, "sync");
     52   // Visit embedded cons string during mark compact.
     53   gc();
     54 }
     55 
     56 function f() {
     57   return "abcdefghijklmn" + "123456789";
     58 }
     59 
     60 function g() {
     61   return "abcdefghijklmn\u2603" + "123456789";
     62 }
     63 
     64 function h() {
     65   return "abcdefghijklmn\u2603" + "123456789\u2604";
     66 }
     67 
     68 test(f);
     69 test(g);
     70 test(h);
     71