bool has_smi_or_object_maps = false;
bool has_js_array_access = false;
bool has_non_js_array_access = false;
+ bool has_seen_holey_elements = false;
Handle<Map> most_general_consolidated_map;
for (int i = 0; i < maps->length(); ++i) {
Handle<Map> map = maps->at(i);
} else {
return NULL;
}
+ // Remember if we've ever seen holey elements.
+ if (IsHoleyElementsKind(map->elements_kind())) {
+ has_seen_holey_elements = true;
+ }
// Remember the most general elements kind, the code for its load will
// properly handle all of the more specific cases.
if ((i == 0) || IsMoreGeneralElementsKindTransition(
if (!has_double_maps && !has_smi_or_object_maps) return NULL;
HCheckMaps* check_maps = Add<HCheckMaps>(object, maps);
+ // FAST_ELEMENTS is considered more general than FAST_HOLEY_SMI_ELEMENTS.
+ // If we've seen both, the consolidated load must use FAST_HOLEY_ELEMENTS.
+ ElementsKind consolidated_elements_kind = has_seen_holey_elements
+ ? GetHoleyElementsKind(most_general_consolidated_map->elements_kind())
+ : most_general_consolidated_map->elements_kind();
HInstruction* instr = BuildUncheckedMonomorphicElementAccess(
object, key, val, check_maps,
most_general_consolidated_map->instance_type() == JS_ARRAY_TYPE,
- most_general_consolidated_map->elements_kind(),
+ consolidated_elements_kind,
false, NEVER_RETURN_HOLE, STANDARD_STORE);
return instr;
}
--- /dev/null
+// Copyright 2013 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following
+// disclaimer in the documentation and/or other materials provided
+// with the distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// 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
+
+function foo(array) {
+ return array[0];
+}
+
+var a = [1, 2, , 4]; // Holey Smi elements.
+var b = ["abcd", 0]; // Fast elements.
+foo(b); // Observe fast elements first, or the IC will transition without
+foo(a); // going polymorphic.
+%OptimizeFunctionOnNextCall(foo);
+var c = [, 0];
+assertEquals(undefined, foo(c)); // Elided hole check will leak the hole.