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Dictionary allocation is a stack-oriented allocation scheme, i.e., if you want to deallocate X, you also deallocate everything allocated after X.
The allocations using the words below are contiguous and grow the region
towards increasing addresses. Other words that allocate dictionary
memory of any kind (i.e., defining words including
the contiguous region and start a new one.
In ANS Forth only
created words are guaranteed to produce an
address that is the start of the following contiguous region. In
particular, the cell allocated by
variable is not guaranteed to
be contiguous with following
You can deallocate memory by using
allot with a negative argument
(with some restrictions, see
allot). For larger deallocations use
doc-here doc-unused doc-allot doc-c, doc-f, doc-, doc-2,
Memory accesses have to be aligned (see section 5.7.5 Address arithmetic). So of
course you should allocate memory in an aligned way, too. I.e., before
allocating allocating a cell,
here must be cell-aligned, etc.
The words below align
here if it is not already. Basically it is
only already aligned for a type, if the last allocation was a multiple
of the size of this type and if
here was aligned for this type
createing a word,
ANS Forth (
maxaligned in Gforth).
doc-align doc-falign doc-sfalign doc-dfalign doc-maxalign doc-cfalign
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