[Vm-dev] [VM-dev] What the difference in method format between 32 and 64 bits images?

[Eliot Miranda]

Hi Denis,

On Wed, Apr 12, 2017 at 8:42 AM, Denis Kudriashov <dionisiydk at gmail.com>
wrote:

>
> Hi
>
> I am testing serialization library and now I have problem with compiled
> methods.
> I try to materialise 64bits method in 32bits image and otherwise. Both is
> not working (but in same image everything is fine).
>
> I investigated following difference with "Margitude>>between:and:" as
> example:
>
> (Margitude>>between:and:) size.  "=> 64bits->46; 32bits->30"
>
> (Margitude>>between:and:)  header. "same 34078723 for 64 and 32 bits"
>
> (Margitude>>between:and:)  initialPC. "=> 64bits-> 33; 32bits->17"
>
>
> Is there any formula to convert these values between 64 and 32 bits?
>

read CompiledCode's comment and initialPC.  The initialPC comes after n + 1
literals (the first word of a method is a header SmallInteger; after that
are numLiterals literals).  So the initialPC is

initialPC
"Answer the program counter for the receiver's first bytecode."

^ (self numLiterals + 1) * Smalltalk wordSize + 1



> Best regards,
> Denis
>
>


-- 
_,,,^..^,,,_
best, Eliot
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