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heap.eo
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heap.eo
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# The MIT License (MIT)
#
# 2016-2022 Objectionary.com
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
+architect yegor256@gmail.com
+home https://github.com/objectionary/eo
+package org.eolang
+rt jvm org.eolang:eo-runtime:0.35.8
+version 0.35.8
# Emulation of random-access memory (RAM).
[size] > heap
# Allocates a block in memory of "s" bytes,
# and returns a pointer to it.
# The "length" attribute of the pointer won't be bound.
[s] > malloc
memory 0 > next
plus. > new-next!
s
^.malloc.next.as-int
if. > @
gt.
new-next
size
error
"Allocation failed: bad alloc (not enough memory in the heap)"
seq
*
write.
^.malloc.next
new-next
0.plus
^.malloc.next.as-int
# Freed a block in memory, which is referred by the
# given pointer, which was earlier obtained with malloc().
# Returns TRUE if works. If the pointer provided wasn't
# previously allocated, the result will be [].
[p] > free
seq > @
*
p
TRUE
# Pointer inside the heap.
[address length] > pointer
address > @
# Increment this pointer by x steps forward.
[x] > add
&.^.pointer > @
address.plus
length.times x
length
# Decrement this pointer by x steps backward.
[x] > sub
&.add > @
x.times -1
# One block in the heap.
[len inverse] > block /?