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copied!<p>As stated in a <a href="https://stackoverflow.com/questions/7935054/how-to-modify-erlang-assembly-are-any-resources-available">similar SO-question</a> and <a href="http://www.erlang.org/doc/man/compile.html" rel="nofollow noreferrer">the erlang-documentation</a>:</p> <blockquote> <p>Note that the format of assembler files is not documented, and may change between releases - this option is primarily for internal debugging use.</p> </blockquote> <p>If you realy want to know what's happening, it seems you have to track it down in the source-code. Most of the work is done in erts/emulator/beam/beam_emu.c (I've looked into otp_src_R15B02): </p> <ol> <li><code>call_ext</code>: set the <a href="http://www.erlang.org/doc/apps/erts/crash_dump.html#id71778" rel="nofollow noreferrer">continuation pointer</a> to <em>current instruction+2</em> and dispatch/ call external. <code>call_ext_only</code>: dont touch CP, just dispatch. (~line 1520)</li> <li>both allocate memory but <code>allocate_zero</code> also initializes it to <code>0x00</code> (~line 334).</li> <li><code>test_heap</code>: Check if Nh words of heap are available; if not, do a garbage collection. (~line 390)</li> <li><code>allocate(StackNeeded, NumberOfRegistersToPreserve)</code> (~line 316)</li> </ol> <p>The whole file is a compound of <em>#defines</em> and <em>gotos</em>, some macros are defined inside ops.tab in the same folder. I'm not an expert in erlang-asm either and might have missed something. Please keep that in mind and cross-check my statements before you start to work with them.</p> <p>To quote TamasNagy from the linked SO-awnser:</p> <blockquote> <p>I'm not sure what are you trying to achieve with this, but core erlang might be a better level to do code manipulation. </p> </blockquote> <p>Please look there for further information. Erlang have it strengths but documentation is not one of them.</p> <p>regards.</p>

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