build.py
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import sys, operator, inspect, re, collections
from snakes.utils.abcd import CompilationError, DeclarationError
from snakes.lang.abcd.parser import ast
from snakes.lang import unparse
import snakes.utils.abcd.transform as transform
from snakes.data import MultiSet
from snakes import *
class Decl (object) :
OBJECT = "object"
TYPE = "type"
BUFFER = "buffer"
SYMBOL = "symbol"
CONST = "const"
NET = "net"
TASK = "task"
IMPORT = "import"
def __init__ (self, node, kind=None, **data) :
self.node = node
classname = node.__class__.__name__
if kind is not None :
self.kind = kind
elif classname == "AbcdTypedef" :
self.kind = self.TYPE
elif classname == "AbcdBuffer" :
self.kind = self.BUFFER
elif classname == "AbcdSymbol" :
self.kind = self.SYMBOL
elif classname == "AbcdConst" :
self.kind = self.CONST
elif classname == "AbcdNet" :
self.kind = self.NET
elif classname == "AbcdTask" :
self.kind = self.TASK
elif classname in ("Import", "ImportFrom") :
self.kind = self.IMPORT
else :
self.kind = self.OBJECT
for key, val in data.items() :
setattr(self, key, val)
class GetInstanceArgs (object) :
"""Bind arguments for a net instance
"""
def __init__ (self, node) :
self.argspec = []
self.arg = {}
self.buffer = {}
self.net = {}
self.task = {}
seen = set()
for a in node.args.args + node.args.kwonlyargs :
if a.arg in seen :
self._raise(CompilationError,
"duplicate argument %r" % a.arg)
seen.add(a.arg)
if a.annotation is None :
self.argspec.append((a.arg, "arg"))
else :
self.argspec.append((a.arg, a.annotation.id))
def __call__ (self, *args) :
self.arg.clear()
self.buffer.clear()
self.net.clear()
self.task.clear()
for (name, kind), value in zip(self.argspec, args) :
getattr(self, kind)[name] = value
return self.arg, self.buffer, self.net, self.task
class Builder (object) :
def __init__ (self, snk, path=[], up=None) :
self.snk = snk
self.path = path
self.up = up
self.env = {"True": Decl(None, kind=Decl.CONST, value=True),
"False": Decl(None, kind=Decl.CONST, value=False),
"None": Decl(None, kind=Decl.CONST, value=None),
"dot": Decl(None, kind=Decl.CONST, value=self.snk.dot),
"BlackToken": Decl(None, kind=Decl.TYPE,
type=self.snk.Instance(self.snk.BlackToken))}
self.stack = []
if up :
self.globals = up.globals
else :
self.globals = snk.Evaluator(dot=self.snk.dot,
BlackToken=self.snk.BlackToken)
self.instances = MultiSet()
# utilities
def _raise (self, error, message) :
"""raise an exception with appropriate location
"""
if self.stack :
pos = "[%s:%s]: " % (self.stack[-1].lineno,
self.stack[-1].col_offset)
else :
pos = ""
raise error(pos+message)
def _eval (self, expr, *largs, **kwargs) :
env = self.globals.copy()
if isinstance(expr, ast.AST) :
expr = unparse(expr)
return env(expr, dict(*largs, **kwargs))
# declarations management
def __setitem__ (self, name, value) :
if name in self.env :
self._raise(DeclarationError, "duplicated declaration of %r" % name)
self.env[name] = value
def __getitem__ (self, name) :
if name in self.env :
return self.env[name]
elif self.up is None :
self._raise(DeclarationError, "%r not declared" % name)
else :
return self.up[name]
def __contains__ (self, name) :
if name in self.env :
return True
elif self.up is None :
return False
else :
return name in self.up
def goto (self, name) :
if name in self.env :
return self
elif self.up is None :
self._raise(DeclarationError, "%r not declared" % name)
else :
return self.up.goto(name)
def get_buffer (self, name) :
if name not in self :
self._raise(DeclarationError,
"buffer %r not declared" % name)
decl = self[name]
if decl.kind != Decl.BUFFER :
self._raise(DeclarationError,
"%r declared as %s but used as buffer"
% (name, decl.kind))
elif decl.capacity is not None :
pass
#self._raise(NotImplementedError, "capacities not (yet) supported")
return decl
def get_net (self, name) :
if name not in self :
self._raise(DeclarationError,
"net %r not declared" % name)
decl = self[name]
if decl.kind != Decl.NET :
self._raise(DeclarationError,
"%r declared as %s but used as net"
% (name, decl.kind))
return decl
def get_task (self, name) :
if name not in self :
self._raise(DeclarationError,
"task %r not declared" % name)
decl = self[name]
if decl.kind != Decl.TASK :
self._raise(DeclarationError,
"%r declared as %s but used as task"
% (name, decl.kind))
return decl
# main compiler entry point
def build (self, node, prefix="", fallback=None) :
self.stack.append(node)
if prefix :
prefix += "_"
method = "build_" + prefix + node.__class__.__name__
visitor = getattr(self, method, fallback or self.build_fail)
try :
return visitor(node)
finally :
self.stack.pop(-1)
def build_fail (self, node) :
self._raise(CompilationError, "do not know how to compile %s"
% node.__class__.__name__)
def build_arc (self, node) :
return self.build(node, "arc", self.build_arc_expr)
# specification
def build_AbcdSpec (self, node) :
for decl in node.context :
self.build(decl)
tasks = [self._build_TaskNet(decl.node)
for name, decl in self.env.items()
if decl.kind == Decl.TASK and decl.used]
net = reduce(operator.or_, tasks, self.build(node.body))
# set local buffers marking, and hide them
for name, decl in ((n, d) for n, d in self.env.items()
if d.kind == Decl.BUFFER) :
status = self.snk.buffer(name)
for place in net.status(status) :
place = net.place(place)
try :
place.reset(decl.marking)
except ValueError as err :
self._raise(CompilationError,
"invalid initial marking (%s)" % err)
if decl.capacity is None :
cap = None
else :
#cap = [c.n if c else None for c in decl.capacity]
# TODO: accept more than integers as capacities
cap = []
for c in decl.capacity :
if c is None :
cap.append(None)
else :
try :
cap.append(self._eval(c))
except :
err = sys.exc_info()[1]
self._raise(CompilationError,
"could not evaluate %r, %s"
% (unparse(c), err))
place.label(path=self.path,
capacity=cap)
# TODO: check capacity
net.hide(status)
if self.up is None :
# set entry marking
for place in net.status(self.snk.entry) :
net.place(place).reset(self.snk.dot)
# rename nodes
self._rename_nodes(net)
# copy global declarations
net.globals.update(self.globals)
# add info about source file
net.label(srcfile=str(node.st.text.filename))
# add assertions
net.label(asserts=node.asserts)
return net
def _build_TaskNet (self, node) :
self._raise(NotImplementedError, "tasks not (yet) supported")
def _rename_nodes (self, net) :
# generate unique names
total = collections.defaultdict(int)
count = collections.defaultdict(int)
def ren (node) :
if net.has_transition(node.name) :
status = node.label("srctext")
else :
if node.status == self.snk.entry :
status = "e"
elif node.status == self.snk.internal :
status = "i"
elif node.status == self.snk.exit :
status = "x"
else :
status = node.label("buffer")
name = ".".join(node.label("path") + [status])
if total[name] > 1 :
count[name] += 1
name = "%s#%s" % (name, count[name])
return name
# count occurrences of each name base
_total = collections.defaultdict(int)
for node in net.node() :
_total[ren(node)] += 1
total = _total
# rename nodes using a depth-first traversal
done = set(net.status(self.snk.entry))
todo = [net.node(n) for n in done]
while todo :
node = todo.pop(-1)
new = ren(node)
if new != node.name :
net.rename_node(node.name, new)
done.add(new)
for n in net.post(new) - done :
todo.append(net.node(n))
done.add(n)
# rename isolated nodes
for letter, method in (("p", net.place), ("t", net.transition)) :
for node in method() :
if node.name not in done :
net.rename_node(node.name, ren(node))
# declarations
def build_AbcdTypedef (self, node) :
"""
>>> import snakes.nets
>>> b = Builder(snakes.nets)
>>> b.build(ast.AbcdTypedef(name='number', type=ast.UnionType(types=[ast.NamedType(name='int'), ast.NamedType(name='float')])))
>>> b.env['number'].type
(Instance(int) | Instance(float))
>>> b.build(ast.ImportFrom(module='inspect', names=[ast.alias(name='isbuiltin')]))
>>> b.build(ast.AbcdTypedef(name='builtin', type=ast.NamedType(name='isbuiltin')))
>>> b.env['builtin'].type
TypeCheck(inspect.isbuiltin)
"""
self[node.name] = Decl(node, type=self.build(node.type))
def build_AbcdBuffer (self, node) :
self[node.name] = Decl(node,
type=self.build(node.type),
capacity=node.capacity,
marking=self._eval(node.content))
def build_AbcdSymbol (self, node) :
for name in node.symbols :
value = self.snk.Symbol(name, False)
self[name] = Decl(node, value=value)
self.globals[name] = value
def build_AbcdConst (self, node) :
value = self._eval(node.value)
self[node.name] = Decl(node, value=value)
self.globals[node.name] = value
def build_AbcdNet (self, node) :
self[node.name] = Decl(node, getargs=GetInstanceArgs(node))
def build_AbcdTask (self, node) :
self._raise(NotImplementedError, "tasks not (yet) supported")
self[node.name] = Decl(node, used=False)
def build_Import (self, node) :
for alias in node.names :
self[alias.asname or alias.name] = Decl(node)
self.globals.declare(unparse(node))
def build_ImportFrom (self, node) :
self.build_Import(node)
# processes
def build_AbcdAction (self, node) :
if node.guard is True :
return self._build_True(node)
elif node.guard is False :
return self._build_False(node)
else :
return self._build_action(node)
def _build_True (self, node) :
net = self.snk.PetriNet("true")
e = self.snk.Place("e", [], self.snk.tBlackToken,
status=self.snk.entry)
e.label(path=self.path)
net.add_place(e)
x = self.snk.Place("x", [], self.snk.tBlackToken,
status=self.snk.exit)
x.label(path=self.path)
net.add_place(x)
t = self.snk.Transition("t")
t.label(srctext=node.st.source(),
srcloc=(node.st.srow, node.st.scol,
node.st.erow, node.st.ecol),
path=self.path)
net.add_transition(t)
net.add_input("e", "t", self.snk.Value(self.snk.dot))
net.add_output("x", "t", self.snk.Value(self.snk.dot))
return net
def _build_False (self, node) :
net = self.snk.PetriNet("false")
e = self.snk.Place("e", [], self.snk.tBlackToken,
status=self.snk.entry)
e.label(path=self.path)
net.add_place(e)
x = self.snk.Place("x", [], self.snk.tBlackToken,
status=self.snk.exit)
x.label(path=self.path)
net.add_place(x)
return net
def _build_action (self, node) :
net = self.snk.PetriNet("flow")
e = self.snk.Place("e", [], self.snk.tBlackToken,
status=self.snk.entry)
e.label(path=self.path)
net.add_place(e)
x = self.snk.Place("x", [], self.snk.tBlackToken,
status=self.snk.exit)
x.label(path=self.path)
net.add_place(x)
t = self.snk.Transition("t", self.snk.Expression(unparse(node.guard)),
status=self.snk.tick("action"))
t.label(srctext=node.st.source(),
srcloc=(node.st.srow, node.st.scol,
node.st.erow, node.st.ecol),
path=self.path)
net.add_transition(t)
net.add_input("e", "t", self.snk.Value(self.snk.dot))
net.add_output("x", "t", self.snk.Value(self.snk.dot))
net = reduce(operator.or_, [self.build(a) for a in node.accesses],
net)
net.hide(self.snk.tick("action"))
return net
def build_AbcdFlowOp (self, node) :
return self.build(node.op)(self.build(node.left),
self.build(node.right))
def _get_instance_arg (self, arg) :
if arg.__class__.__name__ == "Name" and arg.id in self :
return self[arg.id]
else :
try :
self._eval(arg)
except :
self._raise(CompilationError,
"could not evaluate argument %r"
% arg.st.source())
return arg
def build_AbcdInstance (self, node) :
if node.net not in self :
self._raise(DeclarationError, "%r not declared" % node.net)
elif node.starargs :
self._raise(CompilationError, "* argument not allowed here")
elif node.kwargs :
self._raise(CompilationError, "** argument not allowed here")
decl = self[node.net]
if decl.kind != Decl.NET :
self._raise(DeclarationError,
"%r declared as %s but used as net"
% (name, decl.kind))
# unpack args
posargs, kwargs = [], {}
for arg in node.args :
posargs.append(self._get_instance_arg(arg))
for kw in node.keywords :
kwargs[kw.arg] = self._get_instance_arg(kw.value)
# bind args
try :
args, buffers, nets, tasks = decl.getargs(*posargs, **kwargs)
except TypeError :
c, v, t = sys.exc_info()
self._raise(CompilationError, str(v))
for d, kind in ((buffers, Decl.BUFFER),
(nets, Decl.NET),
(tasks, Decl.TASK)) :
for k, v in d.items() :
if v.kind != kind :
self._raise(DeclarationError,
"%r declared as %s but used as %s"
% (k, v.kind, kind))
d[k] = v.node.name
# build sub-net
binder = transform.ArgsBinder(args, buffers, nets, tasks)
spec = binder.visit(decl.node.body)
if node.asname :
name = str(node.asname)
else :
name = node.st.source()
if name in self.instances :
name = "%s#%s" % (name, self.instances(name))
self.instances.add(name)
path = self.path + [name]
builder = self.__class__(self.snk, path, self)
net = builder.build(spec)
src = (node.st.source(),
node.st.srow, node.st.scol,
node.st.erow, node.st.ecol)
for trans in net.transition() :
try :
lbl = trans.label("instances")
trans.label(instances=[src] + lbl)
except KeyError :
trans.label(instances=[src])
for place in net.place() :
if place.status == self.snk.Status(None) :
try :
lbl = place.label("instances")
place.label(instances=[src] + lbl)
except KeyError :
place.label(instances=[src])
return net
# control flow operations
def build_Sequence (self, node) :
return self.snk.PetriNet.__and__
def build_Choice (self, node) :
return self.snk.PetriNet.__add__
def build_Parallel (self, node) :
return self.snk.PetriNet.__or__
def build_Loop (self, node) :
return self.snk.PetriNet.__mul__
# accesses :
def build_SimpleAccess (self, node) :
decl = self.get_buffer(node.buffer)
net = self.snk.PetriNet("access")
net.add_transition(self.snk.Transition("t", status=self.snk.tick("action")))
b = self.snk.Place(str(node.buffer), [], decl.type,
status=self.snk.buffer(node.buffer))
b.label(path=self.path,
buffer=str(node.buffer),
srctext=decl.node.st.source(),
srcloc=(decl.node.st.srow, decl.node.st.scol,
decl.node.st.erow, decl.node.st.ecol))
net.add_place(b)
self.build(node.arc)(net, node.buffer, "t", self.build_arc(node.tokens))
return net
def build_FlushAccess (self, node) :
decl = self.get_buffer(node.buffer)
net = self.snk.PetriNet("access")
net.add_transition(self.snk.Transition("t", status=self.snk.tick("action")))
b = self.snk.Place(str(node.buffer), [], decl.type,
status=self.snk.buffer(node.buffer))
b.label(path=self.path,
buffer=str(node.buffer),
srctext=decl.node.st.source(),
srcloc=(decl.node.st.srow, decl.node.st.scol,
decl.node.st.erow, decl.node.st.ecol))
net.add_place(b)
net.add_input(node.buffer, "t", self.snk.Flush(node.target))
return net
def build_SwapAccess (self, node) :
decl = self.get_buffer(node.buffer)
net = self.snk.PetriNet("access")
net.add_transition(self.snk.Transition("t", status=self.snk.tick("action")))
b = self.snk.Place(node.buffer, [], decl.type,
status=self.snk.buffer(node.buffer))
b.label(path=self.path,
buffer=str(node.buffer),
srctext=decl.node.st.source(),
srcloc=(decl.node.st.srow, decl.node.st.scol,
decl.node.st.erow, decl.node.st.ecol))
net.add_place(b)
net.add_input(node.buffer, "t", self.build_arc(node.target))
net.add_output(node.buffer, "t", self.build_arc(node.tokens))
return net
def build_Spawn (self, node) :
self._raise(NotImplementedError, "tasks not (yet) supported")
def build_Wait (self, node) :
self._raise(NotImplementedError, "tasks not (yet) supported")
def build_Suspend (self, node) :
self._raise(NotImplementedError, "tasks not (yet) supported")
def build_Resume (self, node) :
self._raise(NotImplementedError, "tasks not (yet) supported")
# arc labels
def build_arc_Name (self, node) :
if node.id in self :
decl = self[node.id]
if decl.kind in (Decl.CONST, Decl.SYMBOL) :
return self.snk.Value(decl.value)
return self.snk.Variable(node.id)
def build_arc_Num (self, node) :
return self.snk.Value(node.n)
def build_arc_Str (self, node) :
return self.snk.Value(node.s)
def build_arc_Tuple (self, node) :
return self.snk.Tuple([self.build_arc(elt) for elt in node.elts])
def build_arc_expr (self, node) :
return self.snk.Expression(unparse(node))
# arcs
def build_Produce (self, node) :
def arc (net, place, trans, label) :
net.add_output(place, trans, label)
return arc
def build_Test (self, node) :
def arc (net, place, trans, label) :
net.add_input(place, trans, self.snk.Test(label))
return arc
def build_Consume (self, node) :
def arc (net, place, trans, label) :
net.add_input(place, trans, label)
return arc
def build_Fill (self, node) :
def arc (net, place, trans, label) :
net.add_output(place, trans, self.snk.Flush(str(label)))
return arc
# types
def build_UnionType (self, node) :
return reduce(operator.or_, (self.build(child)
for child in node.types))
def build_IntersectionType (self, node) :
return reduce(operator.and_, (self.build(child)
for child in node.types))
def build_CrossType (self, node) :
return self.snk.CrossProduct(*(self.build(child)
for child in node.types))
def build_ListType (self, node) :
return self.snk.List(self.build(node.items))
def build_TupleType (self, node) :
return self.snk.Collection(self.snk.Instance(tuple),
(self.build(node.items)))
def build_SetType (self, node) :
return self.snk.Set(self.build(node.items))
def build_DictType (self, node) :
return self.snk.Mapping(keys=self.build(node.keys),
items=self.build(node.items),
_dict=self.snk.Instance(self.snk.hdict))
def build_EnumType (self, node) :
return self.snk.OneOf(*(self._eval(child) for child in node.items))
def build_NamedType (self, node) :
name = node.name
if name in self and self[name].kind == Decl.TYPE :
return self[name].type
elif name in self.globals :
obj = self.globals[name]
if inspect.isclass(obj) :
return self.snk.Instance(obj)
elif inspect.isroutine(obj) :
return self.snk.TypeCheck(obj)
elif hasattr(sys.modules["__builtin__"], name) :
obj = getattr(sys.modules["__builtin__"], name)
if inspect.isclass(obj) :
return self.snk.Instance(obj)
elif inspect.isroutine(obj) :
return self.snk.TypeCheck(obj)
self._raise(CompilationError,
"invalid type %r" % name)
if __name__ == "__main__" :
import doctest
doctest.testmod(optionflags=doctest.NORMALIZE_WHITESPACE
| doctest.REPORT_ONLY_FIRST_FAILURE
| doctest.ELLIPSIS)
from snakes.lang.abcd.parser import parse
node = parse(open(sys.argv[1]).read())
import snakes.plugins
snk = snakes.plugins.load(["ops", "gv", "labels"], "snakes.nets", "snk")
build = Builder(snk)
net = build.build(node)
net.draw(sys.argv[1] + ".png")