174645 2017-07-18 16:30:58 -0700 Reduce memory usage during OSR 2017-08-17 14:52:34 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified ASSIGNED InRadar P2 Normal --- 175144 175145 175453 174694 174696 174697 174809 174837 175446 175549 175617 175688 1 mark.lam mark.lam fpizlo jfbastien keith_miller msaboff saam ticaiolima webkit-bug-importer ysuzuki oldest_to_newest 1330195 0 mark.lam 2017-07-18 16:30:58 -0700 Details coming. <rdar://problem/33183238> 1330199 1 mark.lam 2017-07-18 16:35:58 -0700 Currently, when we have to do an OSR exit (DFG->baseline or FTL->baseline), we generate >=1kb of machine code that does the exit. We don’t need to generate any code for every exit; we could just have one shared JIT probe that calls a C++ function that does the exit. This would save a lot of executable memory. This also means that supporting the JIT probe mechanism will be required in order to use the DFG and FTL going forward. Currently, the only CPU targets that support the JIT probe are ARM, ARMv7, ARM64, x86, and x86_64.