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unwind-protect for lexical binding
From: |
Sergey Mozgovoy |
Subject: |
unwind-protect for lexical binding |
Date: |
Mon, 10 Mar 2014 20:42:59 -0700 (PDT) |
I propose a patch for Emacs 24.3 that implements a new byte code for
unwind-protect which is more friendly for lexical scope.
100 lex-unwind-protect <address> ------o
103 {protection body} |
... ................. |
176 byte-return |
177 {protected-form} <------------------o
... ..................
217 byte-unbind 1
... ..................
This works as shown above: execution of `unwind-protect' starts with
retaining where the protection body is and jumping to the protected
form. When unwinding, the remembered element is popped off the
specpdl stack, and a call into the necessary spot inside the bytecode
string is made.
I'll be very thankful to see any comments and thoughts on this idea.
Unfortunately, for this aproach to work I had to disable some
byte-level optimizations in `byte-opt.el' -- namely, the
`byte-after-unbind-ops' variable and the corresponding trick which
moves some bytecodes past an `unbind'.
Here's a list of patched files:
alloc.c.diff <http://emacs.1067599.n5.nabble.com/file/n316523/alloc.c.diff>
bytecode.c.diff
<http://emacs.1067599.n5.nabble.com/file/n316523/bytecode.c.diff>
lisp.h.diff <http://emacs.1067599.n5.nabble.com/file/n316523/lisp.h.diff>
bytecomp.el.diff
<http://emacs.1067599.n5.nabble.com/file/n316523/bytecomp.el.diff>
byte-opt.el.diff
<http://emacs.1067599.n5.nabble.com/file/n316523/byte-opt.el.diff>
cconv.el.diff
<http://emacs.1067599.n5.nabble.com/file/n316523/cconv.el.diff>
---
Best regards,
Sergey Mozgovoy.
--
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- unwind-protect for lexical binding,
Sergey Mozgovoy <=