From c8c0fd4ca39fbdcf9ca5f2fc99ca4d6b81a28b65 Mon Sep 17 00:00:00 2001
From: Damien George
Date: Wed, 25 Sep 2019 15:45:47 +1000
Subject: py: Rework and compress second part of bytecode prelude.

This patch compresses the second part of the bytecode prelude which
contains the source file name, function name, source-line-number mapping
and cell closure information.  This part of the prelude now begins with a
single varible length unsigned integer which encodes 2 numbers, being the
byte-size of the following 2 sections in the header: the "source info
section" and the "closure section".  After decoding this variable unsigned
integer it's possible to skip over one or both of these sections very
easily.

This scheme saves about 2 bytes for most functions compared to the original
format: one in the case that there are no closure cells, and one because
padding was eliminated.
---
 tests/import/mpy_native.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'tests/import')

diff --git a/tests/import/mpy_native.py b/tests/import/mpy_native.py
index 03abab349..749320dbb 100644
--- a/tests/import/mpy_native.py
+++ b/tests/import/mpy_native.py
@@ -56,8 +56,8 @@ user_files = {
     '/mod1.mpy': (
         b'M\x05\x0b\x1f\x20' # header
 
-        b'\x24' # n bytes, bytecode
-            b'\x00\x05\x00\x00\x00\x00\xff' # prelude
+        b'\x20' # n bytes, bytecode
+            b'\x00\x08\x00\x00\x00\x00' # prelude
             b'\x51' # LOAD_CONST_NONE
             b'\x63' # RETURN_VALUE
 
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