From 7150c6753933f12a2ba63769fb7b3a44cfcddd3d Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Thu, 26 Nov 2020 10:34:31 +0900
Subject: Make `OP_JMP*` operand address to be relative.

Jump target address is `operand (16bit)` + `address of next instruction`.

In addition, `ilen` was made `uint32_t` so that `iseq` length limitation
of 65536 is removed. Only jump target address should be within signed
16bit (-32768 .. 32767).
---
 doc/mruby3.md | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'doc')

diff --git a/doc/mruby3.md b/doc/mruby3.md
index bc0a74b00..3d9159940 100644
--- a/doc/mruby3.md
+++ b/doc/mruby3.md
@@ -137,6 +137,11 @@ No more operand extention
 * `OP_EXT2`
 * `OP_EXT3`
 
+## Changed Instructions
+
+Jump addresses used to be specified by absolute offset from the start of `iseq`. Now they are relative offset from the address of the next instruction.
+
+
 ## `Random` now use `xoshiro128++`.
 
 For better and faster random number generation.
-- 
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