From 4ba669da7f42b02691f5c4c9febea20e7a0895f2 Mon Sep 17 00:00:00 2001 From: tenderlove Date: Fri, 9 Mar 2018 20:11:45 +0000 Subject: Add direct marking on iseq operands Directly marking iseq operands allows us to eliminate the "mark array" stored on ISEQ objects, which will reduce the amount of memory ISEQ objects consume. This patch changes the iseq mark function to: * Directly marks ISEQ operands * Iterate over and mark child ISEQs It also introduces two flags on the ISEQ object. In order to mark instruction operands, we have to disassemble the instructions and find the instruction parameters and types. Instructions may also be translated to jump addresses. Instruction sequences may get marked by the GC *while* they're mid flight (being compiled). The `ISEQ_TRANSLATED` flag is used to indicate whether or not the instructions have been translated to jump addresses so that when we decode the instructions we know whether or not we need to go from jump location back to original instruction or not. Not all ISEQ objects have any markable objects embedded in their instructions. We can detect whether or not an ISEQ has markable objects in the instructions at compile time. If the instructions contain markable objects, we set a flag `ISEQ_MARKABLE_ISEQ` on the ISEQ object. This means that during the mark phase, we can skip decompilation if the flag is *not* set. In other words, we can avoid decompilation of we know in advance there is nothing to mark. `once` instructions have an operand that contains the result of a one-time compilation of a regex. Before this patch, that operand was called an "inline cache", even though the struct was actually an "inline storage". This patch changes the operand to be an "inline storage" so that we can differentiate between caches that need marking (the inline storage) and caches that don't need marking (inline cache). [ruby-core:84909] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62706 b2dd03c8-39d4-4d8f-98ff-823fe69b080e --- insns.def | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'insns.def') diff --git a/insns.def b/insns.def index 73f2495ea9..da54e0a4b1 100644 --- a/insns.def +++ b/insns.def @@ -972,11 +972,11 @@ setinlinecache /* run iseq only once */ DEFINE_INSN once -(ISEQ iseq, IC ic) +(ISEQ iseq, ISE ise) () (VALUE val) { - val = vm_once_dispatch(ec, iseq, ic); + val = vm_once_dispatch(ec, iseq, ise); } /* case dispatcher, jump by table if possible */ -- cgit v1.2.3