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runtime.py
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runtime.py
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import sys
import io
import os
import traceback
import time
import inspect
import cPickle as pickle
from cStringIO import StringIO
class Tag:
all = {}
def __init__(self, name='???'):
self.name = name
Tag.all[name] = self
def __repr__(self):
return "#<shenpy.Tag {0}>".format(self.name)
type_function = Tag('func')
type_symbol = Tag('sym')
type_cons = Tag('cons')
type_substring = Tag('substr')
type_subvector = Tag('subvec')
type_bool = Tag('bool')
fail_obj = Tag('fail')
error_handlers = []
error_obj = None
fns = {}
globvars = {}
sp = 0
reg_top = 0
reg = [None]
nargs = 0
next = None
start = None
dbg_step = False
dbg_output = sys.stdout
show_step = False
show_step_frame = True
dump_error = True
# Compatibility with python3
try:
xrange
except Exception:
xrange = range
def reg_size(size):
global reg, sp, reg_top
s = len(reg)
top = sp + size
if reg_top < top:
reg_top = top
if top > s:
reg.extend([None] * (top - s))
return reg
def wipe_stack(begin):
global reg, sp, reg_top
for i in xrange(sp + begin, reg_top):
reg[i] = None
reg_top = sp + begin
def run():
global start, error_obj, fns, show_step, nargs, next, sp, reg
while start:
try:
pc = start
start = None
while pc:
#print(pc)
if show_step: dbg_show_step(pc, frame_only = show_step_frame)
pc = pc()
#print('=> pc: {}'.format(pc))
except Exception as error:
#with_dbg_output(lambda f: f.write("**ERROR: {0}\n".format(error)))
#traceback.print_exc()
if len(error_handlers) == 0:
if dump_error:
dbg_show_step("UNCAUGHT ERROR")
raise
#dbg_show_step("ERROR HANDLER")
error_obj = error
call_error_handler(error_obj)
#dbg_print('start: {}'.format(start))
def paranoid_check_sp(prev):
if sp != prev:
error("call left sp {0} != {1}".format(sp, prev))
def paranoid_check_reg(sp):
for i in reg[sp:]:
if i != None:
dbg_print('nonempty reg: {}'.format(i))
dbg_print('nonempty sp: {}'.format(sp))
dbg_print('nonempty reg_top: {}'.format(reg_top))
dbg_print('nonempty regs: {}'.format(reg))
error("call left nonempty reg")
def call_function(proc, *args):
global reg, nargs, sp
i = sp
nargs = len(args)
if isclosure(proc):
nargs += len(proc[3])
reg_size(nargs + 1)
for x in reversed(args):
reg[i] = x
i += 1
if isclosure(proc):
fn = proc[1]
for x in reversed(proc[3]):
reg[i] = x
i += 1
elif callable(proc):
fn = proc
else:
error("{} is not a function".format(proc))
return fn
def call_x(proc, *args):
global reg, nargs, start, sp
prevsp = sp
start = call_function(proc, *args)
run()
paranoid_check_sp(prevsp)
ret = reg[sp]
reg[sp] = None
paranoid_check_reg(sp)
return ret
def error(str):
raise Exception(str)
return fail_obj
def error_to_string(e):
#traceback.print_exc()
return str(e)
def push_error_handler(e):
global error_handlers, sp, reg, nargs
#dbg_show_step("SET ERROR HANDLER")
error_handlers.append((sp, reg_top, nargs, next, e))
#with_dbg_output(lambda out: out.write('cont: {}\n'.format(error_handlers)))
def pop_error_handler():
global error_handlers
error_handlers.pop()
def default_error_handler():
global error_obj
raise error_obj
def error_unwind_get_handler():
global error_handlers, sp, reg_top, nargs, next
sp, reg_top, nargs, next, e = error_handlers.pop()
return e
def call_error_handler(*args):
global error_handlers, sp, reg_top, nargs, next, start
sp, _, nargs, next, e = error_handlers.pop()
#dbg_print("reg_top: {} e: {}".format(reg_top, e))
wipe_stack(0)
start = call_function(e, *args)
#dbg_print("start: {}".format(start))
def dbg_print(x, output=None):
with_dbg_output(lambda out: out.write(x + '\n'), output)
def with_dbg_output(func, output = None):
if not output:
output = dbg_output
if not hasattr(output, 'write'):
with_dbg_output(func, sys.stdout)
with open(output, 'a') as f:
with_dbg_output(func, f)
else:
func(output)
def dbg_show_step_x(name, output, frame_only):
output.write("## SHOW {0}\n".format(name))
output.write(" nargs: {0}\n".format(nargs))
output.write(" next: {0}\n".format(next))
output.write(" sp: {0}\n".format(sp))
output.write(" reg_top: {0}\n".format(reg_top))
if frame_only:
i = sp
else:
i = 0
end = len(reg)
for x in reversed(reg):
if x != None:
break
end -= 1
for x in reg[i:end]:
output.write(" Reg[{0}]: {1}\n".format(i, tostring_x(x)))
i += 1
if end < len(reg):
output.write(" Reg[{0}-{1}]: None\n".format(end, len(reg) - 1))
i = 0
output.write("\n")
if dbg_step and output == sys.stdout:
print("--<Press return to continue>--")
sys.stdin.readline()
def dbg_show_step(name='', frame_only=False, output=None):
with_dbg_output(lambda output: dbg_show_step_x(name, output, frame_only),
output)
def call(proc, *args):
pass
def intern(x):
if x == "true":
return True
elif x == "false":
return False
elif isinstance(x, str):
return (type_symbol, x)
else:
error("intern: argument '{}' is not a string".format(x))
def issymbol(x):
return isinstance(x, tuple) and (len(x) == 2) and (x[0] == type_symbol)
def iscons(x):
return isinstance(x, tuple) and (len(x) == 3) and (x[0] == type_cons)
def isvector(x):
return (isinstance(x, list) and (len(x) > 1)
and (isinstance(x[0], int) or isinstance(x[0], long))
and (x[0] > 0))
def isabsvector(x):
return (isinstance(x, list) and (len(x) > 0) \
and (not isinstance(x[0], Tag)))
def isclosure(x):
return (isinstance(x, tuple) and (len(x) == 5) and x[0] == type_function \
and callable(x[1]))
def isequal_list(x, y):
n = len(x)
if n != len(y):
return False
i = 0
for a in x:
if not isequal(a, y[i]):
return False
i += 1
return True
def isequal(x, y):
return (isinstance(x, bool) and isinstance(y, bool) and x == y) \
or (((isinstance(x, tuple) and isinstance(y, tuple)) \
or (isinstance(x, list) and isinstance(y, list))) \
and isequal_list(x, y)) \
or x == y \
or (issymbol(x) and isclosure(y) and x[1] == y[4]) \
or (issymbol(y) and isclosure(x) and y[1] == x[4])
def setval(key, x):
if not issymbol(key):
return error("The value {0} is not a symbol".format(key))
globvars[key[1]] = x
return x
def absvector_set(v, i, x):
v[i] = x
return v
def tostring(x):
if isinstance(x, bool):
if x:
return "true"
else:
return "false"
elif isinstance(x, int) or isinstance(x, float) or isinstance(x, long):
return repr(x)
elif issymbol(x):
return x[1]
elif isclosure(x):
if x[4] == None:
if x[1].__name__:
return "#<closure " + x[1].__name__ + "#" + str(id(x)) + ">"
else:
return "#<closure #" + str(id(x)) + ">"
elif len(x[3]) == 0:
return x[4]
else:
return "#<closure " + x[4] + "#" + str(id(x)) + ">"
elif x == fail_obj:
return "..."
else:
return error("str cannot convert {0} to a string." .format(x))
def filter_pred(line):
return not (line.startswith("global ") or line.startswith("del "))
def eval_code():
global ret
ret = next
x = reg[sp]
# Avoid leaking of defined one-shot functions
y = "global toplevel_func\n"
y += "def toplevel_func():\n"
y += " global ret, nargs, reg\n"
y += "\n".join(map(lambda line: " " + line,
filter(filter_pred, x.split("\n"))))
#print('eval_code y:\n{0}\n'.format(y))
exec(compile(y, "<string>", "exec"))
global toplevel_func
toplevel_func()
del toplevel_func
#print('eval_code ret: {0}'.format(ret))
return ret
def proc(x = ""):
def mk(fn, name):
if name == '':
name = fn.__name__
args = inspect.getargspec(fn).args
x_nargs = len(args)
def x():
r = fn_entry(x, x_nargs, name)
if r != fail_obj: return r
r = fn(*reversed(reg[sp:sp + x_nargs]))
return fn_return(r, next)
reg_size(1)
reg[sp] = fns[name] = (type_function, x, x_nargs, [], name)
return fn
if callable(x):
return mk(x, x.__name__)
return lambda f: mk(f, x)
def defun_x(name, nargs, func):
reg_size(1)
reg[sp] = fns[name] = (type_function, func, nargs, [], name)
return next
def dbg_list(items):
ret = ()
for x in reversed(items):
ret = (type_cons, x, ret)
return ret
def dbg_pylist(x):
ret = []
while iscons(x):
ret.append(x[1])
x = x[2]
return ret
def tostring_list(x):
s = "["
sep = ""
while iscons(x):
s = s + sep + tostring_x(x[1])
sep = " "
x = x[2]
return s + "]"
def tostring_x(x):
if iscons(x):
return tostring_list(x)
elif x == ():
return '[]'
elif isinstance(x, str):
return '"' + x + '"'
elif isvector(x):
return '<' + ', '.join(map(tostring_x, x)) + '>'
elif isabsvector(x):
return '<<' + ', '.join(map(tostring_x, x)) + '>>'
else:
try:
x = tostring(x)
if x == fail_obj:
return '...'
else:
return x
except:
return str(x)
def read_byte(stream):
s = stream.read(1)
if len(s) == 0:
return -1
return ord(s)
def write_byte(byte, stream):
stream.write(chr(byte))
return byte
def write_string(str, out):
out.write(str)
return str
@proc('open')
def open_file(name, dir):
modes = {"in" : "r", "out" : "w"}
mode = None
if issymbol(dir):
mode = modes.get(dir[1])
if mode:
path = os.path.expanduser(globvars["*home-directory*"] + name)
return open(path, mode)
else:
return error("open: '{0}' unknown direction".format(tostring_x(dir)))
@proc('shenpy.print')
def shenpy_print(x):
print(x)
return True
@proc('shenpy.exec')
def shenpy_exec(x):
exec(compile(x, "<string>", "exec"))
return True
@proc('shenpy.eval')
def shenpy_eval(x):
return eval(x)
def shenpy_load():
with open(reg[sp], 'r') as f:
reg[sp] = f.read()
return eval_code()
def repl():
call(fns["shen.shen"])
globvars["*macros*"] = ()
globvars["*stoutput*"] = sys.stdout
globvars["*stinput*"] = sys.stdin
globvars["*language*"] = "python"
globvars["*implementation*"] = "all"
globvars["*port*"] = "0.1.0"
globvars["*porters*"] = "Ramil Farkhshatov"
def nop():
wipe_stack(0)
return next
defun_x("shen.process-datatype", 2, nop)
defun_x("compile", 3, nop)
defun_x("declare", 2, nop)
defun_x("adjoin", 2, nop)
defun_x("shenpy.eval", 1, eval_code)
defun_x("shenpy.load", 1, shenpy_load)
defun_x("shenpy.quit", 0, quit)
@proc('get-time')
def get_time(x):
return time.time()
def mk_closure():
global reg, sp, nargs, next
fn = reg[sp + nargs - 1]
v = reg[sp:sp + nargs - 1]
wipe_stack(1)
reg[sp] = (type_function, fn, nargs, v, None)
return next
defun_x("klvm-mk-closure", 1, mk_closure)
def test_regs():
global reg, sp
reg_size(10)
for i in xrange(11): reg[i] = i
print("regs: {}\n".format(reg))
wipe_stack(5)
print("regs: {}\n".format(reg))
def dbg_log(fn):
def x(*args):
dbg_print("({} {})".format(fn, args))
ret = fn(*args)
dbg_print("({} {}) => {}".format(fn, args, ret))
return ret
x.__name__ = fn.__name__
return x
def pickle_id(obj):
if isinstance(obj, Tag):
return obj.name
else:
return None
def pickle_load(id):
return Tag.all[id]
def dump(obj):
out = StringIO()
p = pickle.Pickler(out, -1)
p.persistent_id = pickle_id
p.dump(obj)
return out.getvalue()
def load(data):
stream = StringIO(data)
up = pickle.Unpickler(stream)
up.persistent_load = pickle_load
return up.load()
def test_dump():
import pprint
x = [2, fail_obj, dbg_list(["one", 'tw"o', "thr'e", 4])]
s = dump(x)
pp = pprint.PrettyPrinter()
with open("toystate.py", "wt") as f:
f.write("data = ")
f.write(pp.pformat(s))
f.write("\n")