## Heap and Pointers ##
The first 16 heap addresses (`0-15`) are reserved when using the stdlib.
+Within that reservation, heap[0] is used by `random` and heap[15] is used
+by `spewreg`. The remaining 14 locations, heap[1]-heap[14] are used as
+general-purpose registers.
By convention, functions which return a pointer will use the address `0` to
represent a `NULL` pointer.
header comment for each function to learn the call and return stack.
000xxx - reserved
- 001xxx - print functions
- 1000 ----- print string from stack (stdio.pvvs)
- 1001 ----- print string from heap (stdio.pvvs)
- 1010 ----- print number from stack (stdio.pvvs)
+ 001xxx - core functions
+ 1000 ----- printf (stdio.pvvs)
+ 1001 ----- print number from stack (stdio.pvvs)
+ 1010 ----- stackrotate (stack.pvvs)
010xxx - math functions
10000 ----- random (math.pvvs)
10001 ----- absolute value (math.pvvs)
1000001 ----- spew registers (heap.pvvs)
1000010 ----- print sign of number (stdio.pvvs)
1000011 ----- print magnitude of number (stdio.pvvs)
+ 1000100 ----- print string from stack (stdio.pvvs)
+ 1000101 ----- print string from heap (stdio.pvvs)
# Misc #
00001000 xxxxxxxx - for use by 1000
00001001 xxxxxxxx - for use by 1001
...etc
-
-# Slurp and Spew #
-
-The stdlib uses heap[1] to heap[15] as registers.
-
-The `slurpreg` and `spewreg` functions facilitate this by `spew`ing the stack
-onto the heap's pseudo-registers or `slurp`ing the pseudo-registers back to the
-stack. The functions preserve order in complementary fashion.
-
-The `spewreg` function uses `heap[0]` for storage.