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Fill in one-word-fillers for the unused property fields.

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BUG=chromium:240056

Review URL: https://chromiumcodereview.appspot.com/15247003
Patch from Toon Verwaest <verwaest@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14714 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
danno@chromium.org 2013-05-17 06:58:06 +00:00
parent 73d084fad3
commit 58a3fd3666
1 changed files with 12 additions and 0 deletions
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12
src/hydrogen.cc
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@ -10934,9 +10934,11 @@ void HOptimizedGraphBuilder::BuildEmitDeepCopy(
boilerplate_object->map()->instance_descriptors());
int limit = boilerplate_object->map()->NumberOfOwnDescriptors();
int copied_fields = 0;
for (int i = 0; i < limit; i++) {
PropertyDetails details = descriptors->GetDetails(i);
if (details.type() != FIELD) continue;
copied_fields++;
int index = descriptors->GetFieldIndex(i);
int property_offset = boilerplate_object->GetInObjectPropertyOffset(index);
Handle<Name> name(descriptors->GetKey(i));
@ -10975,6 +10977,16 @@ void HOptimizedGraphBuilder::BuildEmitDeepCopy(
}
}
int inobject_properties = boilerplate_object->map()->inobject_properties();
HInstruction* value_instruction = AddInstruction(new(zone) HConstant(
factory->one_pointer_filler_map(), Representation::Tagged()));
for (int i = copied_fields; i < inobject_properties; i++) {
AddInstruction(new(zone) HStoreNamedField(
object_properties, factory->unknown_field_string(), value_instruction,
true, Representation::Tagged(),
boilerplate_object->GetInObjectPropertyOffset(i)));
}
// Build Allocation Site Info if desired
if (create_allocation_site_info) {
BuildCreateAllocationSiteInfo(target, JSArray::kSize, original_boilerplate);