kiedtl / bureaucrat Goto Github PK

Currently, basically no memory is ever freed. The allocator isn't even deinit'd.

Start out by writing routines for recursively freeing ASTNode's, then start deinit'ing the GPA, and piping the output traces through less to find out what else is not being deallocated.

Making dip, sip, bi@, bi*, etc builtin would provide more "structured programming"-type improvements. For example, dip would allow for refactoring the following:

move
over dup * swap -
(r move) +

into

(dip [ over dup * swap - ]) +

There would still be a manually-defined version for the stdlib though.

• dip
• others

s/ASTNodeList/Block/g in common.zig, where Block is something along the lines of struct { body: ASTNodeList, scope: *Scope }.

Would allow for per-block locals, types, etc, and provide better error reporting (due to blocks carrying their own srcloc info). Would also allow cleaning up the Cond struct.

Shouldn't be too disruptive of a change.

Would be nice.

The idea is that pointers are marked as const using some method, and are then prohibited from being passed to words that (indirectly or directly) call STA (i.e. takes a non-const pointer).

("Marking" pointers in this case means modifying their type signature. I'm not settled on what the signature for this is -- could be @const Type, @@Type, &Type, (Cons @Type), or something else.)

Pointers can be made const in a few ways:

• (const) to constify the pointer on TOS
• (const foo) to constify a variable
• #const (let CONSTANT [ 0x0 ]) to declare a variable constant.
  • Not a fan of this one, as it encourages abusing variables to hold constant values (words should be used for that).

Same principle for device ports -- writing a readonly port literal results in Const_Dev16/Const_Dev8, which cannot be passed to words that require a non-readonly port. (Not sure if adding this particular feature is worth the extra complexity. I mean, how often would one accidentally try to write to a readonly port?)

In-progress on the fixpt branch.

TODO:

• Basic addition/subtraction
• Multiplication, division
• Printing
• Better division routine that uses multi-word division rather than multiplying by the reciprocal
• CORDIC sin/cos
• Wrapper for CORDIC sin/cos that has a larger domain
• Natural log
• Exponentiation
• Powers
• Ceil, floor, round
• Lexer/parser support for fixed point literals(?)