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types_builtin.py
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types_builtin.py
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from base import *
def prim_equal(p1, p2):
return match((p1, p2),
("(PInt(), PInt())", lambda: True),
("(PFloat(), PFloat())", lambda: True),
("(PStr(), PStr())", lambda: True),
("(PChar(), PChar())", lambda: True),
("(PBool(), PBool())", lambda: True),
("_", lambda: False))
def array_kinds_equal(k1, k2):
return match((k1, k2),
("(AGC(), AGC())", lambda: True),
("(ABoxed(), ABoxed())", lambda: True),
("(ARaw(), ARaw())", lambda: True),
("_", lambda: False))
def _type_tuple_equal(ts1, ts2):
if len(ts1) != len(ts2):
return False
for t1, t2 in ezip(ts1, ts2):
if not type_equal(t1, t2):
return False
return True
def _type_func_equal(as1, r1, m1, as2, r2, m2):
if len(as1) != len(as2):
return False
for a1, a2 in ezip(as1, as2):
if not type_equal(a1, a2):
return False
if not results_equal(r1, r2):
return False
return metas_equal(m1, m2)
def _type_data_equal(d1, ts1, d2, ts2):
if d1 is not d2:
return False
if len(ts1) != len(ts2):
return False
for t1, t2 in ezip(ts1, ts2):
if not type_equal(t1, t2):
return False
return True
def _type_array_equal(t1, k1, t2, k2):
if not type_equal(t1, t2):
return False
if not array_kinds_equal(k1, k2):
return False
return True
def type_equal(a, b):
if a is b:
return True
return match((a, b),
("(TVar(a), TVar(b))", lambda a, b: a is b),
("(TPrim(a), TPrim(b))", prim_equal),
("(TTuple(ts1), TTuple(ts2))", _type_tuple_equal),
("(TFunc(args1, r1, m1), TFunc(args2, r2, m2))", _type_func_equal),
("(TData(d1, ts1), TData(d2, ts2))", _type_data_equal),
("(TCtor(c1, ts1), TCtor(c2, ts2))", _type_data_equal),
("(TArray(t1, k1), TArray(t2, k2))", _type_array_equal),
("(TWeak(a), TWeak(b))", type_equal),
("_", lambda: False))
def results_equal(a, b):
return match((a, b), ("(Ret(a), Ret(b))", type_equal),
("(Void(), Void())", lambda: True),
("(Bottom(), Bottom())", lambda: True),
("_", lambda: False))
def _get_name(a):
if not a or not has_extrinsic(Name, a):
try:
return '<%r?>' % (a,)
except:
return '<??!>'
return extrinsic(Name, a)
REPRENV = new_env('REPRENV', set([Type]))
def _meta_type_repr(t, j):
assert t is not j
return _type_repr(j)
def _type_repr(t):
seen = env(REPRENV)
if t in seen:
return '<cyclic 0x%x>' % id(t)
seen.add(t)
rstr = match(t, ("TVar(v)", lambda v: col('Green', _get_name(v))),
("TPrim(PInt())", lambda: 'int'),
("TPrim(PFloat())", lambda: 'float'),
("TPrim(PStr())", lambda: 'str'),
("TPrim(PChar())", lambda: 'char'),
("TPrim(PBool())", lambda: 'bool'),
("TTuple(ts)", lambda ts: fmtcol('^Cyan^t(^N{0}^Cyan)^N',
(col('Cyan', ', ').join(map(_type_repr, ts))))),
("TArray(t, kind)", _tarray_repr),
("TFunc(ps, res, m)", _func_repr),
("TData(d, ps)", _tdata_repr),
("TCtor(c, ps)", _tdata_repr),
("TWeak(t)", lambda t: '*%s' % (_type_repr(t),)),
("CMeta(cell)", repr),
("_", lambda: mark('<bad type %s>' % type(t))))
seen.remove(t)
return rstr
def _func_repr(ps, result, meta):
if len(ps) == 0:
s = 'void'
elif len(ps) == 1 and not meta.params[0].held:
s = _type_repr(ps[0])
else:
bits = [col('Cyan', '(')]
first = True
for param, pmeta in ezip(ps, meta.params):
if first:
first = False
else:
bits.append(col('Cyan', ', '))
bits.append(_type_repr(param))
if pmeta.held:
bits.append(col('LG', ' held'))
bits.append(col('Cyan', ')'))
s = ''.join(bits)
ret = match(result, ('Ret(t)', _type_repr),
('Void()', lambda: 'void'),
('Bottom()', lambda: 'noreturn'))
if not meta.envParam:
ret += col('LG', ' noenv')
for environ in meta.requiredEnvs:
ret += fmtcol(' ^LG{0}^N', extrinsic(Name, environ))
return fmtcol('{0} ^Cyan->^N {1}', s, ret)
def _tdata_repr(dt, apps):
if not apps:
return _get_name(dt)
return fmtcol('{0}^LG(^N{1}^LG)^N', dt,
col('Cyan', ', ').join(map(_type_repr, apps)))
def _tarray_repr(t, kind):
pfx = match(kind, ("AGC()", lambda: ''),
("ABoxed()", lambda: 'x'),
("ARaw()", lambda: 'r'))
return fmtcol('^Red{0}^N[{1}]', pfx, _type_repr(t))
def cyclic_check_type_repr(t):
return in_env(REPRENV, set(), lambda: _type_repr(t))
def _inject_type_reprs():
temp = globals()
for t in temp:
if len(t) > 1 and t[0] == 'T' and t[1].isupper():
temp[t].__repr__ = cyclic_check_type_repr
_inject_type_reprs()
def map_type_vars(f, t):
"""Applies f to every typevar in the given type."""
# critical function
cls = t.__class__
if cls is TPrim:
return t
elif cls is TVar:
return f(t)
elif cls is TData:
return TData(t.data, [map_type_vars(f, a) for a in t.appTypes])
elif cls is TCtor:
return TCtor(m.ctor, [map_type_vars(f, a) for a in t.appTypes])
elif cls is TFunc:
ps = [map_type_vars(f, p) for p in t.paramTypes]
m = match(t.result)
if m('Ret(t)'):
m.ret(Ret(map_type_vars(f, m.t)))
elif m('Void()'):
m.ret(Void())
elif m('Bottom()'):
m.ret(Bottom())
return TFunc(ps, m.result(), copy_meta(t.meta))
elif cls is TTuple:
return TTuple([map_type_vars(f, tt) for tt in t.tupleTypes])
elif cls is TArray:
return TArray(map_type_vars(f, t.elemType), t.arrayKind)
elif cls is TWeak:
return TWeak(map_type_vars(f, t.refType))
else:
assert False
def occurs(typeVar, t):
visit = lambda t: visit_type_vars(f, t)
visit_many = lambda ts: all(visit_type_vars(f, t) for t in ts)
cls = t.__class__
if cls is TPrim:
return False
elif cls is TVar:
return t.typeVar is typeVar
elif cls is TData or cls is TCtor:
return any(occurs(typeVar, a) for a in t.appTypes)
elif cls is TFunc:
if any(occurs(typeVar, p) for p in t.paramTypes):
return True
if t.result.__class__ is Ret and occurs(typeVar, t.result.type):
return True
return False
elif cls is TTuple:
return any(occurs(typeVar, tt) for tt in t.tupleTypes)
elif cls is TArray:
return occurs(typeVar, t.elemType)
elif cls is TWeak:
return occurs(typeVar, t.refType)
else:
assert False
def subst_affects(mapping, t):
visit = lambda t: visit_type_vars(f, t)
visit_many = lambda ts: all(visit_type_vars(f, t) for t in ts)
cls = t.__class__
if cls is TPrim:
return False
elif cls is TVar:
return t.typeVar in mapping
elif cls is TData or cls is TCtor:
return any(subst_affects(mapping, a) for a in t.appTypes)
elif cls is TFunc:
if any(subst_affects(mapping, p) for p in t.paramTypes):
return True
if t.result.__class__ is Ret and subst_affects(mapping, t.result.type):
return True
return False
elif cls is TTuple:
return any(subst_affects(mapping, tt) for tt in t.tupleTypes)
elif cls is TArray:
return subst_affects(mapping, t.elemType)
elif cls is TWeak:
return subst_affects(mapping, t.refType)
else:
assert False
def app_map(data, appTs):
apps = {}
for tv, at in ezip(data.tvars, appTs):
if isinstance(at, TVar) and at.typeVar is tv:
continue
apps[tv] = at
return apps
def subst(mapping, t):
return map_type_vars(lambda st: mapping.get(st.typeVar, st), t)
# Make sure the input is sane and non-redundant
def checked_subst(mapping, t):
for tvar, rt in mapping.iteritems():
assert not occurs(tvar, rt), "%s occurs in replacement %s" % (tvar, rt)
unseen = set(mapping)
assert len(unseen) > 0, "Empty substitution for %s" % (t,)
def app(st):
tvar = st.typeVar
if tvar in mapping:
st = mapping[tvar]
if tvar in unseen:
unseen.remove(tvar)
return st
s = map_type_vars(app, t)
assert len(unseen) == 0, "Typevars %s unused in subst for %s" % (unseen, t)
return s
def is_strong_type(t):
return matches(t, "TData(_, _) or TCtor(_, _) or TArray(_, _)" +
" or TTuple(_) or TFunc(_, _, _)")
def ctor_type(ctor, dtT):
paramTypes = []
paramMetas = []
for f in ctor.fields:
paramTypes.append(f.type)
paramMetas.append(ParamMeta(is_strong_type(f.type)))
return TFunc(paramTypes, Ret(dtT), basic_meta(paramMetas))
builtins_types = {
'True': 'bool', 'False': 'bool', 'not': 'bool -> bool',
'+': '(int, int) -> int', '-': '(int, int) -> int',
'*': '(int, int) -> int', '//': '(int, int) -> int',
'%': '(int, int) -> int',
'negate': 'int -> int', 'fnegate': 'float -> float',
'fadd': '(float, float) -> float', 'fsub': '(float, float) -> float',
'fmul': '(float, float) -> float', 'fdiv': '(float, float) -> float',
'float': 'int -> float', 'int': 'float -> int',
'&': '(int, int) -> int', '|': '(int, int) -> int',
'^': '(int, int) -> int',
'==': '(int, int) -> bool', '!=': '(int, int) -> bool',
'<': '(int, int) -> bool', '>': '(int, int) -> bool',
'<=': '(int, int) -> bool', '>=': '(int, int) -> bool',
'is': '(a, a) -> bool', 'is not': '(a, a) -> bool',
'len': '[a] -> int', 'subscript': '([a], int) -> a',
'rawlen': 'r[a] -> int', 'intsubscript': '(r[int], int) -> int',
'buffer': 'int -> str', 'free_buffer': 'str -> void',
}
# vi: set sw=4 ts=4 sts=4 tw=79 ai et nocindent: