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77 lines
2.6 KiB
77 lines
2.6 KiB
from ..base import *
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from ..conversions import *
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from ..func_utils import *
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from pyjsparser import parse
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from ..byte_trans import ByteCodeGenerator, Code
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def Function(this, args):
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# convert arguments to python list of strings
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a = list(map(to_string, tuple(args)))
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_body = u';'
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_args = ()
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if len(a):
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_body = u'%s;' % a[-1]
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_args = a[:-1]
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return executable_function(_body, _args, args.space, global_context=True)
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def executable_function(_body, _args, space, global_context=True):
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func_str = u'(function (%s) { ; %s ; });' % (u', '.join(_args), _body)
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co = executable_code(
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code_str=func_str, space=space, global_context=global_context)
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return co()
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# you can use this one lovely piece of function to compile and execute code on the fly! Watch out though as it may generate lots of code.
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# todo tape cleanup? we dont know which pieces are needed and which are not so rather impossible without smarter machinery something like GC,
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# a one solution would be to have a separate tape for functions
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def executable_code(code_str, space, global_context=True):
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# parse first to check if any SyntaxErrors
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parsed = parse(code_str)
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old_tape_len = len(space.byte_generator.exe.tape)
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space.byte_generator.record_state()
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start = space.byte_generator.exe.get_new_label()
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skip = space.byte_generator.exe.get_new_label()
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space.byte_generator.emit('JUMP', skip)
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space.byte_generator.emit('LABEL', start)
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space.byte_generator.emit(parsed)
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space.byte_generator.emit('NOP')
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space.byte_generator.emit('LABEL', skip)
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space.byte_generator.emit('NOP')
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space.byte_generator.restore_state()
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space.byte_generator.exe.compile(
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start_loc=old_tape_len
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) # dont read the code from the beginning, dont be stupid!
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ctx = space.GlobalObj if global_context else space.exe.current_ctx
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def ex_code():
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ret, status, token = space.byte_generator.exe.execute_fragment_under_context(
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ctx, start, skip)
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# todo Clean up the tape!
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# this is NOT a way to do that because the fragment may contain the executable code! We dont want to remove it
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#del space.byte_generator.exe.tape[old_tape_len:]
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if status == 0:
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return ret
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elif status == 3:
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raise token
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else:
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raise RuntimeError(
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'Unexpected return status during JIT execution: %d' % status)
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return ex_code
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def _eval(this, args):
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code_str = to_string(get_arg(args, 0))
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return executable_code(code_str, args.space, global_context=True)()
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def log(this, args):
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print(' '.join(map(to_string, args)))
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return undefined
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