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    • jgruber's avatar
      [regexp] Use consistent map checks for fast paths · eb10dc4c
      jgruber authored 
      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}
      eb10dc4c
    • machenbach's avatar
      Revert of [regexp] Use consistent map checks for fast paths (patchset #7... · 0b7e35ff
      machenbach authored 
      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}
      0b7e35ff
    • jgruber's avatar
      [regexp] Use consistent map checks for fast paths · bac992a1
      jgruber authored 
      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}
      bac992a1
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