gh-mirror/mikepaul-LuaJIT
1
0
Fork 0
mirror of https://github.com/LuaJIT/LuaJIT.git synced 2025-02-08 23:44:08 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
Mirror of the LuaJIT git repository
2,005 Commits 3 Branches 28 Tags 16 MiB
C 82.4%
Lua 15.6%
Makefile 1%
Batchfile 0.9%
79021951e5
Go to file
Peter Cawley 79021951e5 LJ_FR2: Improve trace recording and snapshots. 
The interesting changes here revolve around slots marked as TREF_FRAME /
TREF_CONT. Under !LJ_FR2, said slots contain two 32-bit values, and the
TRef for the slot primarily relates to the low 32 bits. In a snapshot, the
main SnapEntry relates to the low 32 bits, and the framelink from the
snapshot is used to restore the high 32 bits. Under LJ_FR2, TREF_FRAME /
TREF_CONT slots contain a single 64-bit value. The TRef relates to all 64
bits, the SnapEntry is used to restore all 64 bits, and no framelinks are
required to restore the slot. Restoration is done via IR_KNUM constants,
as the 64-bit values in question can be happily interpreted as denormal
numbers. These constants are created lazily: the slots in question get set
to just TREF_FRAME / TREF_CONT initially, and then if required for a
snapshot, the ref part of the TRef is changed from zero to the index of a
KNUM. Slot 1 is always zero, as although it is technically a frame link,
it never needs to be changed or saved or restored.

Though the framelink part of a snapshot isn't required for slot
restoration under LJ_FR2, it is still used for restoring PC. As such,
every snapshot has exactly two framelink entries, which are used to store
a 64-bit value.

Manipulations of J->maxslot are more interesting under LJ_FR2. For
example, the BC_MOV of a method call can introduce a three-slot gap under
LJ_FR2, whereas it could only introduce a one-slot gap under !LJ_FR2.
Other instructions can now introduce a one-slot gap where previously they
wouldn't ever introduce a gap.
2016-05-18 03:56:21 +01:00
doc Windows/x86: Add full exception interoperability. 2016-05-07 12:32:15 +02:00
dynasm DynASM/x86: Add ADX instructions. 2016-03-06 12:25:03 +01:00
etc RELEASE LuaJIT-2.1.0-beta2 2016-03-03 12:40:02 +01:00
src LJ_FR2: Improve trace recording and snapshots. 2016-05-18 03:56:21 +01:00
.gitignore RELEASE LuaJIT-2.0.0-beta1 2009-12-08 19:46:35 +01:00
COPYRIGHT Bump copyright date to 2016. 2016-03-03 12:02:22 +01:00
Makefile Merge branch 'master' into v2.1 2016-03-22 22:22:51 +01:00
README RELEASE LuaJIT-2.1.0-beta2 2016-03-03 12:40:02 +01:00

README 

README for LuaJIT 2.1.0-beta2
-----------------------------

LuaJIT is a Just-In-Time (JIT) compiler for the Lua programming language.

Project Homepage: http://luajit.org/

LuaJIT is Copyright (C) 2005-2016 Mike Pall.
LuaJIT is free software, released under the MIT license.
See full Copyright Notice in the COPYRIGHT file or in luajit.h.

Documentation for LuaJIT is available in HTML format.
Please point your favorite browser to:

 doc/luajit.html