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    • littledan's avatar
      Implement immutable prototype chains · 0ff7b483
      littledan authored 
      This patch implements "immutable prototype exotic objects" from the ECMAScript
spec, which are objects whose __proto__ cannot be changed, but are not otherwise
frozen. They are introduced in order to prevent a Proxy from being introduced
to the prototype chain of the global object.

The API is extended by a SetImmutablePrototype() call in ObjectTemplate, which
can be used to vend new immutable prototype objects. Additionally, Object.prototype
is an immutable prototype object.

In the implementation, a new bit is added to Maps to say whether the prototype is
immutable, which is read by SetPrototype. Map transitions to the immutable prototype
state are not saved in the transition tree because the main use case is just for
the prototype chain of the global object, which there will be only one of per
Context, so no need to take up the extra word for a pointer in each full transition
tree.

BUG=v8:5149

Review-Url: https://codereview.chromium.org/2108203002
Cr-Commit-Position: refs/heads/master@{#37482}
      0ff7b483
  25. 30 Jun, 2016 1 commit
  27. 29 Jun, 2016 1 commit
  29. 28 Jun, 2016 2 commits
    • yangguo's avatar
      [snapshot] revisit snapshot API. · 872c461b
      yangguo authored 
      This part of the snapshot API should not be in use yet, so we can still
change this. The motivation for this change is:
- Use MaybeHandle where reasonable.
- Remove ambiguity: when we use index to create context from snapshot,
  we should not have a silent fallback if snapshot is not available.
- Symmetry: rename to Context::FromSnapshot to mirror templates.

R=jochen@chromium.org
BUG=chromium:617892

Review-Url: https://codereview.chromium.org/2100073002
Cr-Commit-Position: refs/heads/master@{#37334}
      872c461b
    • alph's avatar
      Fix MSAN error on arm64 bot. · ca1dcc9c
      alph authored 
      The main fix is to mark stack memory the SafeStackFrameIterator
accesses as initialied.

Drive-by: Make sure we bail out when the simulator is in the
process of updating FP/SP registers.

BUG=v8:5156

Review-Url: https://codereview.chromium.org/2104763002
Cr-Commit-Position: refs/heads/master@{#37315}
      ca1dcc9c
  31. 27 Jun, 2016 3 commits
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  43. 14 Jun, 2016 2 commits
  45. 13 Jun, 2016 1 commit