[wasm] Handle no initial memory case correctly when memory is exported

[wasm] Handle no initial memory case correctly when memory is exported

Currently when the module has memory specified in the compiled bytes, but with no initial memory
exported memory assigns a bogus buffer to the instance. When grow_memory is called on this buffer, it tries to patch an incorrect address.
 - Fix exported memory to handle no initial memory
 - Fix grow_memory to handle uninitialized buffers

BUG=chromium:710844
R=bradnelson@chromium.org

Review-Url: https://codereview.chromium.org/2820223002
Cr-Commit-Position: refs/heads/master@{#44671}
Committed: https://chromium.googlesource.com/v8/v8/+/78b8d7ed8ce1b70dd753b6b2a1f0a867d8be6104

[gdeepti, 2017-04-17 23:40:24]

The CQ bit was checked by gdeepti@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-04-17 23:40:34]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[gdeepti, 2017-04-17 23:41:00]

Description was changed from

==========
[wasm] Handle no initial memory case correctly when memory is exported

Currently when the module has memory specified in the compiled bytes, but with
no initial memory
exported memory assigns a bogus buffer to the instance. When grow_memory is
called on this buffer, it tries to patch an incorrect address.
 - Fix exported memory to handle no initial memory
 - Fix grow_memory to check to handle bogus buffers

BUG=chromium:710844
R=bradnelson@chromium.org
==========

to

==========
[wasm] Handle no initial memory case correctly when memory is exported

Currently when the module has memory specified in the compiled bytes, but with
no initial memory
exported memory assigns a bogus buffer to the instance. When grow_memory is
called on this buffer, it tries to patch an incorrect address.
 - Fix exported memory to handle no initial memory
 - Fix grow_memory to handle uninitialized buffers

BUG=chromium:710844
R=bradnelson@chromium.org
==========

[gdeepti, 2017-04-17 23:41:02]

Description was changed from

==========
[wasm] Handle no initial memory case correctly when memory is exported

Currently when the module has memory specified in the compiled bytes, but with
no initial memory
exported memory assigns a bogus buffer to the instance. When grow_memory is
called on this buffer, it tries to patch an incorrect address.
 - Fix exported memory to handle no initial memory
 - Fix grow_memory to check to handle bogus buffers

BUG=chromium:710844
R=bradnelson@chromium.org
==========

to

==========
[wasm] Handle no initial memory case correctly when memory is exported

Currently when the module has memory specified in the compiled bytes, but with
no initial memory
exported memory assigns a bogus buffer to the instance. When grow_memory is
called on this buffer, it tries to patch an incorrect address.
 - Fix exported memory to handle no initial memory
 - Fix grow_memory to handle uninitialized buffers

BUG=chromium:710844
R=bradnelson@chromium.org
==========

[bradnelson, 2017-04-17 23:46:18]

lgtm

[commit-bot: I haz the power, 2017-04-18 00:05:17]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-04-18 00:05:17]

Dry run: Try jobs failed on following builders:
  v8_linux_dbg_ng on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_dbg_ng/builds/24525)
  v8_linux_dbg_ng_triggered on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_dbg_ng_triggered/b...)

[gdeepti, 2017-04-18 05:00:56]

The CQ bit was checked by gdeepti@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-04-18 05:01:04]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-04-18 05:25:21]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-04-18 05:25:22]

Dry run: This issue passed the CQ dry run.

[gdeepti, 2017-04-18 06:32:39]

The CQ bit was checked by gdeepti@chromium.org

[gdeepti, 2017-04-18 06:32:39]

The patchset sent to the CQ was uploaded after l-g-t-m from
bradnelson@chromium.org
Link to the patchset: https://codereview.chromium.org/2820223002/#ps20001
(title: "Fix bot failure")

[commit-bot: I haz the power, 2017-04-18 06:32:42]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-04-18 06:34:16]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1492497159504380,
"parent_rev": "1bca73bc832c645138bd3e0306fcaa8bb44dad04", "commit_rev":
"78b8d7ed8ce1b70dd753b6b2a1f0a867d8be6104"}

[commit-bot: I haz the power, 2017-04-18 06:34:24]

Description was changed from

==========
[wasm] Handle no initial memory case correctly when memory is exported

Currently when the module has memory specified in the compiled bytes, but with
no initial memory
exported memory assigns a bogus buffer to the instance. When grow_memory is
called on this buffer, it tries to patch an incorrect address.
 - Fix exported memory to handle no initial memory
 - Fix grow_memory to handle uninitialized buffers

BUG=chromium:710844
R=bradnelson@chromium.org
==========

to

==========
[wasm] Handle no initial memory case correctly when memory is exported

Currently when the module has memory specified in the compiled bytes, but with
no initial memory
exported memory assigns a bogus buffer to the instance. When grow_memory is
called on this buffer, it tries to patch an incorrect address.
 - Fix exported memory to handle no initial memory
 - Fix grow_memory to handle uninitialized buffers

BUG=chromium:710844
R=bradnelson@chromium.org

Review-Url: https://codereview.chromium.org/2820223002
Cr-Commit-Position: refs/heads/master@{#44671}
Committed:
https://chromium.googlesource.com/v8/v8/+/78b8d7ed8ce1b70dd753b6b2a1f0a867d8b...
==========

[commit-bot: I haz the power, 2017-04-18 06:34:25]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/v8/v8/+/78b8d7ed8ce1b70dd753b6b2a1f0a867d8b...