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      1 // Copyright 2009 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
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     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 // Test the handling of initialization of deleted const variables.
     29 // This only makes sense in local scopes since the declaration and
     30 // initialization of consts in the global scope happen at the same
     31 // time.
     32 
     33 function testIntroduceGlobal() {
     34   var source =
     35       // Deleting 'x' removes the local const property.
     36       "delete x;" +
     37       // Initialization turns into assignment to global 'x'.
     38       "const x = 3; assertEquals(3, x);" +
     39       // No constness of the global 'x'.
     40       "x = 4; assertEquals(4, x);";
     41   eval(source);
     42 }
     43 
     44 testIntroduceGlobal();
     45 assertEquals(4, x);
     46 
     47 function testAssignExistingGlobal() {
     48   var source =
     49       // Delete 'x' to remove the local const property.
     50       "delete x;" +
     51       // Initialization turns into assignment to global 'x'.
     52       "const x = 5; assertEquals(5, x);" +
     53       // No constness of the global 'x'.
     54       "x = 6; assertEquals(6, x);";
     55   eval(source);
     56 }
     57 
     58 testAssignExistingGlobal();
     59 assertEquals(6, x);
     60 
     61 function testAssignmentArgument(x) {
     62   function local() {
     63     var source = "delete x; const x = 7; assertEquals(7, x)";
     64     eval(source);
     65   }
     66   local();
     67   assertEquals(7, x);
     68 }
     69 
     70 testAssignmentArgument();
     71 assertEquals(6, x);
     72 
     73 __defineSetter__('x', function() { throw 42; });
     74 function testAssignGlobalThrows() {
     75   // Initialization turns into assignment to global 'x' which
     76   // throws an exception.
     77   var source = "delete x; const x = 8";
     78   eval(source);
     79 }
     80 
     81 assertThrows("testAssignGlobalThrows()");
     82 
     83 function testInitFastCaseExtension() {
     84   var source = "const x = 9; assertEquals(9, x); x = 10; assertEquals(9, x)";
     85   eval(source);
     86 }
     87 
     88 testInitFastCaseExtension();
     89 
     90 function testInitSlowCaseExtension() {
     91   var source = "";
     92   // Introduce 100 properties on the context extension object to force
     93   // it in slow case.
     94   for (var i = 0; i < 100; i++) source += ("var a" + i + " = i;");
     95   source += "const x = 10; assertEquals(10, x); x = 11; assertEquals(10, x)";
     96   eval(source);
     97 }
     98 
     99 testInitSlowCaseExtension();
    100 
    101 function testAssignSurroundingContextSlot() {
    102   var x = 12;
    103   function local() {
    104     var source = "delete x; const x = 13; assertEquals(13, x)";
    105     eval(source);
    106   }
    107   local();
    108   assertEquals(13, x);
    109 }
    110 
    111 testAssignSurroundingContextSlot();
    112