X-Git-Url: http://git.subgeniuskitty.com/vvhitespace/.git/blobdiff_plain/bb21580a5abba6a1e6666e9fb363f68d40f785d7..a67867aead6a33ba7271feb4aaf85a0857cd0bba:/stdlib/README.md diff --git a/stdlib/README.md b/stdlib/README.md index cef4cd4..7508410 100644 --- a/stdlib/README.md +++ b/stdlib/README.md @@ -19,6 +19,9 @@ following reservations: ## 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. @@ -29,10 +32,11 @@ The following labels are entry points to stdlib functions. Read the 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) + 1011 ----- stackrotatereverse (stack.pvvs) 010xxx - math functions 10000 ----- random (math.pvvs) 10001 ----- absolute value (math.pvvs) @@ -45,14 +49,20 @@ header comment for each function to learn the call and return stack. 11101 ----- 11110 ----- slurp (heap.pvvs) 11111 ----- spew (heap.pvvs) - 100xxx - unassigned + 100xxx - string functions + 100000 ----- strlen (string.pvvs) 101xxx - unassigned 110xxx - conversion functions 111xxx - debug functions 111000 ----- dump heap (debug.pvvs) + 111001 ----- dump stack (debug.pvvs) 1xxxxxx - reserved for less common entry points - 1000000 ----- print sign of number (stdio.pvvs) - 1000001 ----- print magnitude of number (stdio.pvvs) + 1000000 ----- slurp registers (heap.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 # @@ -62,13 +72,3 @@ private label space associated with it, formed as follows: 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 `slurp` and `spew` 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 `spew` function uses `heap[0]` for storage.