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jarin authored
This change introduces a liveness analyzer for local variables in frame states. The main idea is to use the AstGraphBuilder::Environment class to build the control flow graph, and record local variable loads, stores and checkpoints in the CFG basic blocks (LivenessAnalyzerBlock class). After the graph building finishes, we run a simple data flow analysis over the CFG to figure out liveness of each local variable at each checkpoint. Finally, we run a pass over all the checkpoints and replace dead local variables in the frame states with the 'undefined' value. Performance numbers for Embenchen are below. ----------- box2d.js Current --turbo-deoptimization: EmbenchenBox2d(RunTime): 11265 ms. d8-master --turbo-deoptimization: EmbenchenBox2d(RunTime): 11768 ms. d8-master: EmbenchenBox2d(RunTime): 10996 ms. ----------- bullet.js Current --turbo-deoptimization: EmbenchenBullet(RunTime): 17049 ms. d8-master --turbo-deoptimization: EmbenchenBullet(RunTime): 17384 ms. d8-master: EmbenchenBullet(RunTime): 16153 ms. ----------- copy.js Current --turbo-deoptimization: EmbenchenCopy(RunTime): 4877 ms. d8-master --turbo-deoptimization: EmbenchenCopy(RunTime): 4938 ms. d8-master: EmbenchenCopy(RunTime): 4940 ms. ----------- corrections.js Current --turbo-deoptimization: EmbenchenCorrections(RunTime): 7068 ms. d8-master --turbo-deoptimization: EmbenchenCorrections(RunTime): 6718 ms. d8-master: EmbenchenCorrections(RunTime): 6858 ms. ----------- fannkuch.js Current --turbo-deoptimization: EmbenchenFannkuch(RunTime): 4167 ms. d8-master --turbo-deoptimization: EmbenchenFannkuch(RunTime): 4608 ms. d8-master: EmbenchenFannkuch(RunTime): 4149 ms. ----------- fasta.js Current --turbo-deoptimization: EmbenchenFasta(RunTime): 9981 ms. d8-master --turbo-deoptimization: EmbenchenFasta(RunTime): 9848 ms. d8-master: EmbenchenFasta(RunTime): 9640 ms. ----------- lua_binarytrees.js Current --turbo-deoptimization: EmbenchenLuaBinaryTrees(RunTime): 11571 ms. d8-master --turbo-deoptimization: EmbenchenLuaBinaryTrees(RunTime): 13089 ms. d8-master: EmbenchenLuaBinaryTrees(RunTime): 10957 ms. ----------- memops.js Current --turbo-deoptimization: EmbenchenMemOps(RunTime): 7766 ms. d8-master --turbo-deoptimization: EmbenchenMemOps(RunTime): 7346 ms. d8-master: EmbenchenMemOps(RunTime): 7738 ms. ----------- primes.js Current --turbo-deoptimization: EmbenchenPrimes(RunTime): 7459 ms. d8-master --turbo-deoptimization: EmbenchenPrimes(RunTime): 7453 ms. d8-master: EmbenchenPrimes(RunTime): 7451 ms. ----------- skinning.js Current --turbo-deoptimization: EmbenchenSkinning(RunTime): 15564 ms. d8-master --turbo-deoptimization: EmbenchenSkinning(RunTime): 15611 ms. d8-master: EmbenchenSkinning(RunTime): 15583 ms. ----------- zlib.js Current --turbo-deoptimization: EmbenchenZLib(RunTime): 10825 ms. d8-master --turbo-deoptimization: EmbenchenZLib(RunTime): 11180 ms. d8-master: EmbenchenZLib(RunTime): 10823 ms. BUG= Review URL: https://codereview.chromium.org/949743002 Cr-Commit-Position: refs/heads/master@{#27232}
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