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Unified Diff: src/parser.cc

Issue 11414155: Ensure double arrays are filled with holes when extended from variations of empty arrays. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: u Created 8 years, 1 month ago
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Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index 75fd7b73667eb611dd1393f26c1dc559addeff67..a7bb4e7985f7a3ac75de531d41415a4d73f47b5a 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -3718,7 +3718,6 @@ Expression* Parser::ParseArrayLiteral(bool* ok) {
isolate()->factory()->NewFixedArray(values->length(), TENURED);
Handle<FixedDoubleArray> double_literals;
ElementsKind elements_kind = FAST_SMI_ELEMENTS;
- bool has_only_undefined_values = true;
bool has_hole_values = false;
// Fill in the literals.
@@ -3750,7 +3749,6 @@ Expression* Parser::ParseArrayLiteral(bool* ok) {
// FAST_DOUBLE_ELEMENTS and FAST_ELEMENTS as necessary. Always remember
// the tagged value, no matter what the ElementsKind is in case we
// ultimately end up in FAST_ELEMENTS.
- has_only_undefined_values = false;
object_literals->set(i, *boilerplate_value);
if (elements_kind == FAST_SMI_ELEMENTS) {
// Smi only elements. Notice if a transition to FAST_DOUBLE_ELEMENTS or
@@ -3789,13 +3787,6 @@ Expression* Parser::ParseArrayLiteral(bool* ok) {
}
}
- // Very small array literals that don't have a concrete hint about their type
- // from a constant value should default to the slow case to avoid lots of
- // elements transitions on really small objects.
- if (has_only_undefined_values && values->length() <= 2) {
- elements_kind = FAST_ELEMENTS;
- }
-
// Simple and shallow arrays can be lazily copied, we transform the
// elements array to a copy-on-write array.
if (is_simple && depth == 1 && values->length() > 0 &&
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