BUG=v8:5402

Review-Url: https://codereview.chromium.org/2642353002
Cr-Commit-Position: refs/heads/master@{#42552}

BUG=v8:5339

Review-Url: https://codereview.chromium.org/2442333002
Cr-Commit-Position: refs/heads/master@{#40545}

These map checks were implemented for TF code already. This CL makes
sure that parts implemented in C++ follow the same logic, which is:

An object is an unmodified regexp if:
1) it's a receiver,
2) its map is the initial regexp map,
3) its prototype is a receiver,
4) and its prototype's map is the initial prototype's initial map.

We can now be smarter in @@replace and @@split since checking maps
(unlike the previous check of RegExp.prototype.exec) is not observable,
so we can perform fast-path checks at a time of our choosing.

BUG=v8:5339,v8:5434,v8:5123

Review-Url: https://chromiumcodereview.appspot.com/2434983002
Cr-Commit-Position: refs/heads/master@{#40501}

Revert of [regexp] Use consistent map checks for fast paths (patchset #7 id:120001 of https://chromiumcodereview.appspot.com/2434983002/ )

Reason for revert:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/10853

Original issue's description:
> [regexp] Use consistent map checks for fast paths
>
> These map checks were implemented for TF code already. This CL makes
> sure that parts implemented in C++ follow the same logic, which is:
>
> An object is an unmodified regexp if:
> 1) it's a receiver,
> 2) its map is the initial regexp map,
> 3) its prototype is a receiver,
> 4) and its prototype's map is the initial prototype's initial map.
>
> We can now be smarter in @@replace and @@split since checking maps
> (unlike the previous check of RegExp.prototype.exec) is not observable,
> so we can perform fast-path checks at a time of our choosing.
>
> BUG=v8:5339,v8:5434,v8:5123

TBR=yangguo@chromium.org,jgruber@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5339,v8:5434,v8:5123

Review-Url: https://chromiumcodereview.appspot.com/2438283002
Cr-Commit-Position: refs/heads/master@{#40499}

These map checks were implemented for TF code already. This CL makes
sure that parts implemented in C++ follow the same logic, which is:

An object is an unmodified regexp if:
1) it's a receiver,
2) its map is the initial regexp map,
3) its prototype is a receiver,
4) and its prototype's map is the initial prototype's initial map.

We can now be smarter in @@replace and @@split since checking maps
(unlike the previous check of RegExp.prototype.exec) is not observable,
so we can perform fast-path checks at a time of our choosing.

BUG=v8:5339,v8:5434,v8:5123

Review-Url: https://chromiumcodereview.appspot.com/2434983002
Cr-Commit-Position: refs/heads/master@{#40495}

Let AdvanceStringIndex return the incremented index instead of the
increment, and adjust all use sites.

BUG=v8:5339

Review-Url: https://codereview.chromium.org/2415383002
Cr-Commit-Position: refs/heads/master@{#40310}

Now that all accesses to the last match info are in C++ and TF code, we can
finally turn the last match info into a FixedArray. Similar to the ArrayList,
it uses its first field to store its length and grows dynamically in amortized
O(1) time.

Unlike previously, this means that the last match info pointer stored on the
context can actually change (in case the FixedArray needs to grow).

BUG=v8:5339

Review-Url: https://codereview.chromium.org/2415103002
Cr-Commit-Position: refs/heads/master@{#40308}

This CL is in preparation for the upcoming port of
RegExp.prototype.replace, which will need use these methods in
runtime-regexp.cc. Moving them in advance makes that diff less noisy.

BUG=v8:5339

Review-Url: https://codereview.chromium.org/2398413002
Cr-Commit-Position: refs/heads/master@{#40229}