Hydrogen stubs for array constructors

test/mjsunit/allocation-site-info.js

 // Copyright 2012 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
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 //
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 // 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.
 
 // Flags: --allow-natives-syntax --smi-only-arrays --expose-gc
-// Flags: --track-allocation-sites --nooptimize-constructed-arrays
+// Flags: --track-allocation-sites --noalways-opt
 
 // TODO(mvstanton): remove --nooptimize-constructed-arrays and enable
 // the constructed array code below when the feature is turned on
 // by default.
 
 // Test element kind of objects.
 // Since --smi-only-arrays affects builtins, its default setting at compile
 // time sticks if built with snapshot.  If --smi-only-arrays is deactivated
 // by default, only a no-snapshot build actually has smi-only arrays enabled
 // in this test case.  Depending on whether smi-only arrays are actually
 // enabled, this test takes the appropriate code path to check smi-only arrays.
 
-support_smi_only_arrays = %HasFastSmiElements(new Array(1,2,3,4,5,6,7,8));
-optimize_constructed_arrays = false;
+// support_smi_only_arrays = %HasFastSmiElements(new Array(1,2,3,4,5,6,7,8));
+support_smi_only_arrays = true;
+optimize_constructed_arrays = true;
 
 if (support_smi_only_arrays) {
   print("Tests include smi-only arrays.");
 } else {
   print("Tests do NOT include smi-only arrays.");
 }
 
 if (optimize_constructed_arrays) {
   print("Tests include constructed array optimizations.");
 } else {
@@ skipping 60 matching lines @@
 
   obj = new Array(0);
   assertNotHoley(obj);
   assertKind(elements_kind.fast_smi_only, obj);
 
   obj = new Array(2);
   assertHoley(obj);
   assertKind(elements_kind.fast_smi_only, obj);
 
   obj = new Array(1,2,3);
+
   assertNotHoley(obj);
   assertKind(elements_kind.fast_smi_only, obj);
 
   obj = new Array(1, "hi", 2, undefined);
   assertNotHoley(obj);
   assertKind(elements_kind.fast, obj);
 
   function fastliteralcase(literal, value) {
     literal[0] = value;
     return literal;
   }
 
   function get_standard_literal() {
     var literal = [1, 2, 3];
     return literal;
   }
 
   // Case: [1,2,3] as allocation site
   obj = fastliteralcase(get_standard_literal(), 1);
   assertKind(elements_kind.fast_smi_only, obj);
   obj = fastliteralcase(get_standard_literal(), 1.5);
   assertKind(elements_kind.fast_double, obj);
   obj = fastliteralcase(get_standard_literal(), 2);
   // TODO(hpayer): bring the following assert back as soon as allocation
   // sites work again for fast literals
   //assertKind(elements_kind.fast_double, obj);
 
-  obj = fastliteralcase([5, 3, 2], 1.5);
-  assertKind(elements_kind.fast_double, obj);
-  obj = fastliteralcase([3, 6, 2], 1.5);
-  assertKind(elements_kind.fast_double, obj);
-  obj = fastliteralcase([2, 6, 3], 2);
-  assertKind(elements_kind.fast_smi_only, obj);
+  // The test below is in a loop because arrays that live
+  // at global scope without the chance of being recreated
+  // don't have allocation site information attached.
+  for(i=0;i<2;i++) {
+    obj = fastliteralcase([5, 3, 2], 1.5);
+    assertKind(elements_kind.fast_double, obj);
+    obj = fastliteralcase([3, 6, 2], 1.5);
+    assertKind(elements_kind.fast_double, obj);
+    obj = fastliteralcase([2, 6, 3], 2);
+    assertKind(elements_kind.fast_smi_only, obj);
+  }
 
   // Verify that we will not pretransition the double->fast path.
   obj = fastliteralcase(get_standard_literal(), "elliot");
   assertKind(elements_kind.fast, obj);
   // This fails until we turn off optimistic transitions to the
   // most general elements kind seen on keyed stores. It's a goal
   // to turn it off, but for now we need it.
   // obj = fastliteralcase(3);
   // assertKind(elements_kind.fast_double, obj);
 
+  // Make sure this works in crankshafted code too.
+  %OptimizeFunctionOnNextCall(get_standard_literal);
+  get_standard_literal();
+  obj = get_standard_literal();
+  assertKind(elements_kind.fast_double, obj);
+
   function fastliteralcase_smifast(value) {
     var literal = [1, 2, 3, 4];
     literal[0] = value;
     return literal;
   }
 
   obj = fastliteralcase_smifast(1);
   assertKind(elements_kind.fast_smi_only, obj);
   obj = fastliteralcase_smifast("carter");
   assertKind(elements_kind.fast, obj);
@@ skipping 24 matching lines @@
     }
 
     // Case: new Array() as allocation site, smi->fast
     obj = newarraycase_smiobj(1);
     assertKind(elements_kind.fast_smi_only, obj);
     obj = newarraycase_smiobj("gloria");
     assertKind(elements_kind.fast, obj);
     obj = newarraycase_smiobj(2);
     assertKind(elements_kind.fast, obj);
 
+    // first death if we optimze ArraySingleArgumentConstructorStub
     function newarraycase_length_smidouble(value) {
       var a = new Array(3);
       a[0] = value;
       return a;
     }
 
     // Case: new Array(length) as allocation site
     obj = newarraycase_length_smidouble(1);
     assertKind(elements_kind.fast_smi_only, obj);
     obj = newarraycase_length_smidouble(1.5);
@@ skipping 46 matching lines @@
     }
 
     obj = newarraycase_list_smiobj(1);
     assertKind(elements_kind.fast_smi_only, obj);
     obj = newarraycase_list_smiobj("coates");
     assertKind(elements_kind.fast, obj);
     obj = newarraycase_list_smiobj(2);
     assertKind(elements_kind.fast, obj);
   }
 }