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ES5.2 var semantics: take hidden prototypes into account.

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R=mstarzinger@chromium.org
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10546166

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11818 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
rossberg@chromium.org 2012-06-14 14:37:10 +00:00
parent bb0a2ea766
commit 8da87d2308
1 changed files with 10 additions and 4 deletions
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14
src/runtime.cc
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@ -1309,12 +1309,18 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DeclareGlobals) {
if (is_var || is_const) {
// Lookup the property in the global object, and don't set the
// value of the variable if the property is already there.
// Do the lookup locally only, see ES5 errata.
// Do the lookup locally only, see ES5 erratum.
LookupResult lookup(isolate);
if (FLAG_es52_globals)
global->LocalLookup(*name, &lookup);
else
if (FLAG_es52_globals) {
Object* obj = *global;
do {
JSObject::cast(obj)->LocalLookup(*name, &lookup);
obj = obj->GetPrototype();
} while (!lookup.IsFound() && obj->IsJSObject() &&
JSObject::cast(obj)->map()->is_hidden_prototype());
} else {
global->Lookup(*name, &lookup);
}
if (lookup.IsProperty()) {
// We found an existing property. Unless it was an interceptor
// that claims the property is absent, skip this declaration.