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Index > Compiler Internals > Restore and memory consumption

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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
I did few test, and it seems that "restore" doesn't free up any memory, used by "previous" value of equate. Shouldn't it?

my tests were something like:
Code:
macro add2list name*
{
  match _LIST, LIST \{
    restore LIST ;shouldn't this decrease memory requirements?
    define LIST _LIST, name, \`name
  \}
}
;lots of "add2list something" here    
Post 20 Mar 2007, 21:38
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
note: match was used because i needed to restore LIST and after that use it's value. I could aswell do
Code:
X equ LIST
restore LIST
LIST equ X,name, `name
restore X    
Post 20 Mar 2007, 21:45
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Goplat



Joined: 15 Sep 2006
Posts: 181
Goplat
fasm doesn't have a structured heap like C's malloc/free. To get memory it just takes a pointer to free space, adds the desired size and uses the old value. (or, if it's getting memory from the end of a block, subtracts the size and uses the new value)

This is fast, but it means things can't get freed until the end of the phase when all the temporary stuff can be freed at once.
Post 21 Mar 2007, 01:06
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
hmmm... you are probably right. I haven't realized this.

Too bad for memory consumption...
Post 21 Mar 2007, 01:49
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