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wip-rtl native patch

From: Stefan Israelsson Tampe
Subject: wip-rtl native patch
Date: Thu, 9 Aug 2012 20:59:05 +0200


DO you think that this will do as an initial patch to wip-rtl in order to introduce the possibility to
execute native code or JIT:ed code. We reserve the first two indexes in the ip text area to fit
a pointer to native code to be executed.

There is changes to two parts of the code
1.  module/system/vm/rtl.scm, we wrap the make-asm record constructor to initiate the first
two slots to 0 and advance the index pointer.

2. We add code in libguile/cm-engine.c rtl function execution stubs to include a check for 0 at the initial
two/one positions in ip. depending on architecture this will lead to a nonzero value in the case native code should be executed. Currently the code will abort if the head is nonzero but this will change of cause as we introduce more code. When the head is zero the ip is incremented two steps and the code executes as usual.

A cavet could be if writing compiled code out to disk is done lately when native code have been compiled in. In this case we should clean the native part (In the jit case). I did not find where the code that does this is located so I left it open for now.


Attachment: native-wip-rtl.diff
Description: Binary data

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