Looks good. I have a couple of nits, and one high-level comment:
IIUC, this doesn't distinguish between getters and data properties. So if
you
had this:
var error = /* some internally thrown error */
delete error.message;
error.__proto__ = {message: "My message"};
error.toString();
then you'd get the empty default message instead of "My message". Is that
intentional? I guess it's in line with what the previous code did, so it's
probably OK (but a bit surprising).
https://codereview.chromium.org/1281833002/diff/2/src/messages.cc
File src/messages.cc (right):
https://codereview.chromium.org/1281833002/diff/2/src/messages.cc#newcode384
src/messages.cc:384:
isolate->factory()->NewStringFromStaticChars("name");
we already have isolate->factory()->name_string() ;-)
https://codereview.chromium.org/1281833002/diff/2/src/messages.h
File src/messages.h (right):
https://codereview.chromium.org/1281833002/diff/2/src/messages.h#newcode474
src/messages.h:474: for (const auto& visited : helper->visited_) {
nit: I'd prefer the explicitness of s/auto/Handle<JSObject>/
https://codereview.chromium.org/1281833002/diff/2/src/messages.h#newcode483
src/messages.h:483: bool HasVisited() { return has_visited_; }
nit: unix_hacker_style() for simple getters
https://codereview.chromium.org/1281833002/diff/2/src/messages.h#newcode490
src/messages.h:490:
nit: one empty line is enough here
https://codereview.chromium.org/1281833002/diff/2/src/messages.h#newcode491
src/messages.h:491: bool ShadowsInternalError(Isolate* isolate,
LookupIterator* property_lookup,
this could be declared static, right?
https://codereview.chromium.org/1281833002/diff/2/src/messages.h#newcode494
src/messages.h:494: MUST_USE_RESULT MaybeHandle<String>
GetStringifiedProperty(
this could be declared static too, right?
https://codereview.chromium.org/1281833002/
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