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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: --allow-natives-syntax
     29 
     30 // The type feedback oracle had a bug when retrieving the map from an IC
     31 // starting with a negative lookup.
     32 
     33 // Create a holder in fast mode.
     34 var holder = Object.create(null, {
     35   holderMethod: {value: function() {}}
     36 });
     37 assertTrue(%HasFastProperties(holder));
     38 
     39 // Create a receiver into dictionary mode.
     40 var receiver = Object.create(holder, {
     41   killMe: {value: 0, configurable: true},
     42 });
     43 delete receiver.killMe;
     44 assertFalse(%HasFastProperties(receiver));
     45 
     46 // The actual function to test, triggering the retrieval of the wrong map.
     47 function callConstantFunctionOnPrototype(obj) {
     48   obj.holderMethod();
     49 }
     50 
     51 callConstantFunctionOnPrototype(receiver);
     52 callConstantFunctionOnPrototype(receiver);
     53 %OptimizeFunctionOnNextCall(callConstantFunctionOnPrototype);
     54 callConstantFunctionOnPrototype(receiver);
     55 
     56 // Make sure that the function is still optimized.
     57 assertOptimized(callConstantFunctionOnPrototype);
     58