JSStackFrame Evisceration
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This would leave sizeof(JSStackFrame) == 6 words.
Members to remove
Sorted in estimated order of benefit / difficulty:
| Task | Size (wks) | Assignee | Note |
| argc/argv/fun/script/thisv | 3 | lw | Requires StackSegment changes. |
| ncode | 3 | dvander | Merge it with savedPC in method-jit. Requires building map HW PC --> bytecode (which we sortof already heave |
| XdisplaySave | 1 | cdleary | Remove display optimization for great justice! |
| XhookData | .1 | Lazily initialize using JSStackFrame::flags. Included in bug 539144. | |
| annotation | 3 | sayrer | Trivial if we can remove callers in nsScriptSecurityManager. Alas, that is not trivial, so this is going to take a while. |
| callerVersion | .5 | cdleary | Mostly the challenge is just understanding the actual use case. |
| XblockChain | 1 | A bit tricky | |
| rval | 1 | Probably more trouble than its worth to remove, just lazily initialize with a JSStackFrame::flags bit and avoid ever writing in the hot JM call/return paths. | |
| imacpc | 1 | cdleary | Leave uninitialized in call path and use JSStackFrame::flags to indicate whether there is or is not an imacpc. |
Method-jit changes
- PIC for fast natives calls
- PIC/fast path for interpreted inline call