Revert "[heap] Use partial free when shrinking instead of uncommitting"

This reverts commit 0d06e42b690cfe80454c7f065c382f2b7200a40f.

Reason for revert: clusterfuzz and canary crashes.

BUG=chromium:729209,v8:6456

Original change's description:
> [heap] Use partial free when shrinking instead of uncommitting
> 
> This fixes the counter inconsistencies while leaving the memory in an
> inaccessible state.
> 
> Bug: chromium:724947
> Change-Id: I431eb6fda84922a52dfb9380c6b482ada55bccee
> Reviewed-on: https://chromium-review.googlesource.com/519164
> Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
> Reviewed-by: Hannes Payer <hpayer@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#45647}

TBR=hpayer@chromium.org,mlippautz@chromium.org
# Not skipping CQ checks because original CL landed > 1 day ago.
Bug: chromium:724947

Change-Id: I6c52b478b89a858ba984fe17f86cdf15fcfa974c
Reviewed-on: https://chromium-review.googlesource.com/525716
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45733}
2 files changed
tree: 2584338afe72e03a8cc17e7fb8f1d6e998f1cc59
  1. benchmarks/
  2. build_overrides/
  3. docs/
  4. gni/
  5. gypfiles/
  6. include/
  7. infra/
  8. samples/
  9. src/
  10. test/
  11. testing/
  12. third_party/
  13. tools/
  14. .clang-format
  15. .gitignore
  16. .gn
  17. .ycm_extra_conf.py
  18. AUTHORS
  19. BUILD.gn
  20. ChangeLog
  21. CODE_OF_CONDUCT.md
  22. codereview.settings
  23. DEPS
  24. LICENSE
  25. LICENSE.fdlibm
  26. LICENSE.strongtalk
  27. LICENSE.v8
  28. LICENSE.valgrind
  29. Makefile
  30. Makefile.android
  31. OWNERS
  32. PRESUBMIT.py
  33. README.md
  34. snapshot_toolchain.gni
  35. WATCHLISTS
README.md

V8 JavaScript Engine

V8 is Google's open source JavaScript engine.

V8 implements ECMAScript as specified in ECMA-262.

V8 is written in C++ and is used in Google Chrome, the open source browser from Google.

V8 can run standalone, or can be embedded into any C++ application.

V8 Project page: https://github.com/v8/v8/wiki

Getting the Code

Checkout depot tools, and run

    fetch v8

This will checkout V8 into the directory v8 and fetch all of its dependencies. To stay up to date, run

    git pull origin
    gclient sync

For fetching all branches, add the following into your remote configuration in .git/config:

    fetch = +refs/branch-heads/*:refs/remotes/branch-heads/*
    fetch = +refs/tags/*:refs/tags/*

Contributing

Please follow the instructions mentioned on the V8 wiki.