from cStringIO import StringIO
from .errors import MiscError
from .env import Environment
from .compiler.disasm import disasm
from .insns import run
from .ctx import Context
class Form(object):
"""\
A Form is the result of compiling an expression.
"""
def __init__(self, builder, bytecode):
# The environment under which the form is compiled
# This is a reference to an Environment that might
# be shared by many forms. This is only used in
# debugging to find the local variable names used
# by this form.
self.env = builder.env
# The bytecode of this form
self.bytecode = bytecode
# The literals used in bytecode
self.literals = builder.literals
def eval(self, env, vm):
"Eval the form under env and vm."
ctx = Context(self, env, vm.ctx)
return run(ctx)
def disasm(self):
"Show the disassemble of the instructions of the form. Useful for debug."
io = StringIO()
io.write('='*60)
io.write('\n')
io.write('Diasassemble of form at %X\n' % id(self))
io.write("literals:\n")
for i in range(len(self.literals)):
io.write("%4d: %s\n" % (i, self.literals[i]))
io.write("\ninstructions:\n")
io.write('-'*50)
io.write('\n')
disasm(io, self)
content = io.getvalue()
io.close()
return content
