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Junliang Yan authored
Port 71018812 Original Commit Message: This is a reland of 7a2c3713 Original change's description: > [debug] introduced runtime side effect check > > This CL demonstrates minimum valuable addition to existing debug evaluate > without side effects mechanism. > With this CL user can evaluate expressions like: > [a,b] // create any kind of temporary array literals > [a,b].reduce((x,y) => x + y, 0); // use reduce method > [1,2,3].fill(2); // change temporary arrays > > The core idea: any change of the object created during evaluation without > side effects is side effect free. As soon as we try to store this temporary > object to object existed before evaluation we will terminate execution. > > Implementation: > - track all objects allocated during evaluation and mark them as temporary, > - patch all bytecodes which change objects. > > A little more details (including performance analysis): [1]. > > [1] https://docs.google.com/document/d/10qqAtZADspPnpYa6SEdYRxrddfKIZJIzbLtGpsZQkRo/edit# > > Bug: v8:7588 > Change-Id: I69f7b96e1ebd7ad0022219e8213211c7be72a111 > Reviewed-on: https://chromium-review.googlesource.com/972615 > Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org> > Reviewed-by: Yang Guo <yangguo@chromium.org> > Reviewed-by: Ulan Degenbaev <ulan@chromium.org> > Cr-Commit-Position: refs/heads/master@{#52370} R=kozyatinskiy@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com BUG= LOG=N Change-Id: I8706efa53d0bbf7d12e48f4f0c4ac387b5faa97b Reviewed-on: https://chromium-review.googlesource.com/998180Reviewed-by: Joran Siu <joransiu@ca.ibm.com> Commit-Queue: Junliang Yan <jyan@ca.ibm.com> Cr-Commit-Position: refs/heads/master@{#52411}
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