Pycket Dev Page

Ok there's not much here right now, but here are some random dev notes that might help:

What's in this page:

• RPython notes
• JIT notes
• Playing with Racket data internally
• Random notes

RPython notes

• Add _immutable_fields_ in the classes. For lists, use [*], e.g.

  _immutable_fields_ = ["name", "importss[*]", "exports", "all_forms"]

• Use static lists, avoid resizing (i.e. don't use append). e.g.

  ls = [None] * N

• In try/except blocks, try to catch specific exceptions, rather than just using except, like:

  except KeyError:

JIT notes

Get the trace log from the jit:

PYPYLOG=jit-log-opt,jit-backend:logfile ./pycket-c a.rkt

Get summary statistics:

PYPYLOG=jit-summary:- pycket-c main.rkt

Playing with Racket data internally

Structs

How to create a struct object?

Get the struct type

from pycket.prims.general import exn_fail

Now you can directly call the constructor with the arguments (as long as you have a continuation and environment in hand).

exn_fail.constructor.call([message, marks], env, cont)

How to access a field?

Just like the constructor, we can call it's accessor with the object and the field number.

exn_fail.accessor.call([exn_object, 0], env, cont)

Careful about the field argument, it is also related to the parents offset, so it's really 0 + field.

Paremeters

Internally get a value from a parameter :

port = current_error_param.get(cont)

Random notes

Deleting the compiled zo file directories with find:

find -type d -name "pycket" -exec rm -rf {} +

.interpret should only be called from interpret_one