464 lines
14 KiB
Python
464 lines
14 KiB
Python
|
"""Module symbol-table generator"""
|
||
|
|
|
||
|
|
from compiler import ast
|
||
|
|
from compiler.consts import SC_LOCAL, SC_GLOBAL, SC_FREE, SC_CELL, SC_UNKNOWN
|
||
|
|
from compiler.misc import mangle
|
||
|
|
import types
|
||
|
|
|
||
|
|
|
||
|
|
import sys
|
||
|
|
|
||
|
|
MANGLE_LEN = 256
|
||
|
|
|
||
|
|
class Scope:
|
||
|
|
# XXX how much information do I need about each name?
|
||
|
|
def __init__(self, name, module, klass=None):
|
||
|
|
self.name = name
|
||
|
|
self.module = module
|
||
|
|
self.defs = {}
|
||
|
|
self.uses = {}
|
||
|
|
self.globals = {}
|
||
|
|
self.params = {}
|
||
|
|
self.frees = {}
|
||
|
|
self.cells = {}
|
||
|
|
self.children = []
|
||
|
|
# nested is true if the class could contain free variables,
|
||
|
|
# i.e. if it is nested within another function.
|
||
|
|
self.nested = None
|
||
|
|
self.generator = None
|
||
|
|
self.klass = None
|
||
|
|
if klass is not None:
|
||
|
|
for i in range(len(klass)):
|
||
|
|
if klass[i] != '_':
|
||
|
|
self.klass = klass[i:]
|
||
|
|
break
|
||
|
|
|
||
|
|
def __repr__(self):
|
||
|
|
return "<%s: %s>" % (self.__class__.__name__, self.name)
|
||
|
|
|
||
|
|
def mangle(self, name):
|
||
|
|
if self.klass is None:
|
||
|
|
return name
|
||
|
|
return mangle(name, self.klass)
|
||
|
|
|
||
|
|
def add_def(self, name):
|
||
|
|
self.defs[self.mangle(name)] = 1
|
||
|
|
|
||
|
|
def add_use(self, name):
|
||
|
|
self.uses[self.mangle(name)] = 1
|
||
|
|
|
||
|
|
def add_global(self, name):
|
||
|
|
name = self.mangle(name)
|
||
|
|
if self.uses.has_key(name) or self.defs.has_key(name):
|
||
|
|
pass # XXX warn about global following def/use
|
||
|
|
if self.params.has_key(name):
|
||
|
|
raise SyntaxError, "%s in %s is global and parameter" % \
|
||
|
|
(name, self.name)
|
||
|
|
self.globals[name] = 1
|
||
|
|
self.module.add_def(name)
|
||
|
|
|
||
|
|
def add_param(self, name):
|
||
|
|
name = self.mangle(name)
|
||
|
|
self.defs[name] = 1
|
||
|
|
self.params[name] = 1
|
||
|
|
|
||
|
|
def get_names(self):
|
||
|
|
d = {}
|
||
|
|
d.update(self.defs)
|
||
|
|
d.update(self.uses)
|
||
|
|
d.update(self.globals)
|
||
|
|
return d.keys()
|
||
|
|
|
||
|
|
def add_child(self, child):
|
||
|
|
self.children.append(child)
|
||
|
|
|
||
|
|
def get_children(self):
|
||
|
|
return self.children
|
||
|
|
|
||
|
|
def DEBUG(self):
|
||
|
|
print >> sys.stderr, self.name, self.nested and "nested" or ""
|
||
|
|
print >> sys.stderr, "\tglobals: ", self.globals
|
||
|
|
print >> sys.stderr, "\tcells: ", self.cells
|
||
|
|
print >> sys.stderr, "\tdefs: ", self.defs
|
||
|
|
print >> sys.stderr, "\tuses: ", self.uses
|
||
|
|
print >> sys.stderr, "\tfrees:", self.frees
|
||
|
|
|
||
|
|
def check_name(self, name):
|
||
|
|
"""Return scope of name.
|
||
|
|
|
||
|
|
The scope of a name could be LOCAL, GLOBAL, FREE, or CELL.
|
||
|
|
"""
|
||
|
|
if self.globals.has_key(name):
|
||
|
|
return SC_GLOBAL
|
||
|
|
if self.cells.has_key(name):
|
||
|
|
return SC_CELL
|
||
|
|
if self.defs.has_key(name):
|
||
|
|
return SC_LOCAL
|
||
|
|
if self.nested and (self.frees.has_key(name) or
|
||
|
|
self.uses.has_key(name)):
|
||
|
|
return SC_FREE
|
||
|
|
if self.nested:
|
||
|
|
return SC_UNKNOWN
|
||
|
|
else:
|
||
|
|
return SC_GLOBAL
|
||
|
|
|
||
|
|
def get_free_vars(self):
|
||
|
|
if not self.nested:
|
||
|
|
return ()
|
||
|
|
free = {}
|
||
|
|
free.update(self.frees)
|
||
|
|
for name in self.uses.keys():
|
||
|
|
if not (self.defs.has_key(name) or
|
||
|
|
self.globals.has_key(name)):
|
||
|
|
free[name] = 1
|
||
|
|
return free.keys()
|
||
|
|
|
||
|
|
def handle_children(self):
|
||
|
|
for child in self.children:
|
||
|
|
frees = child.get_free_vars()
|
||
|
|
globals = self.add_frees(frees)
|
||
|
|
for name in globals:
|
||
|
|
child.force_global(name)
|
||
|
|
|
||
|
|
def force_global(self, name):
|
||
|
|
"""Force name to be global in scope.
|
||
|
|
|
||
|
|
Some child of the current node had a free reference to name.
|
||
|
|
When the child was processed, it was labelled a free
|
||
|
|
variable. Now that all its enclosing scope have been
|
||
|
|
processed, the name is known to be a global or builtin. So
|
||
|
|
walk back down the child chain and set the name to be global
|
||
|
|
rather than free.
|
||
|
|
|
||
|
|
Be careful to stop if a child does not think the name is
|
||
|
|
free.
|
||
|
|
"""
|
||
|
|
self.globals[name] = 1
|
||
|
|
if self.frees.has_key(name):
|
||
|
|
del self.frees[name]
|
||
|
|
for child in self.children:
|
||
|
|
if child.check_name(name) == SC_FREE:
|
||
|
|
child.force_global(name)
|
||
|
|
|
||
|
|
def add_frees(self, names):
|
||
|
|
"""Process list of free vars from nested scope.
|
||
|
|
|
||
|
|
Returns a list of names that are either 1) declared global in the
|
||
|
|
parent or 2) undefined in a top-level parent. In either case,
|
||
|
|
the nested scope should treat them as globals.
|
||
|
|
"""
|
||
|
|
child_globals = []
|
||
|
|
for name in names:
|
||
|
|
sc = self.check_name(name)
|
||
|
|
if self.nested:
|
||
|
|
if sc == SC_UNKNOWN or sc == SC_FREE \
|
||
|
|
or isinstance(self, ClassScope):
|
||
|
|
self.frees[name] = 1
|
||
|
|
elif sc == SC_GLOBAL:
|
||
|
|
child_globals.append(name)
|
||
|
|
elif isinstance(self, FunctionScope) and sc == SC_LOCAL:
|
||
|
|
self.cells[name] = 1
|
||
|
|
elif sc != SC_CELL:
|
||
|
|
child_globals.append(name)
|
||
|
|
else:
|
||
|
|
if sc == SC_LOCAL:
|
||
|
|
self.cells[name] = 1
|
||
|
|
elif sc != SC_CELL:
|
||
|
|
child_globals.append(name)
|
||
|
|
return child_globals
|
||
|
|
|
||
|
|
def get_cell_vars(self):
|
||
|
|
return self.cells.keys()
|
||
|
|
|
||
|
|
class ModuleScope(Scope):
|
||
|
|
__super_init = Scope.__init__
|
||
|
|
|
||
|
|
def __init__(self):
|
||
|
|
self.__super_init("global", self)
|
||
|
|
|
||
|
|
class FunctionScope(Scope):
|
||
|
|
pass
|
||
|
|
|
||
|
|
class GenExprScope(Scope):
|
||
|
|
__super_init = Scope.__init__
|
||
|
|
|
||
|
|
__counter = 1
|
||
|
|
|
||
|
|
def __init__(self, module, klass=None):
|
||
|
|
i = self.__counter
|
||
|
|
self.__counter += 1
|
||
|
|
self.__super_init("generator expression<%d>"%i, module, klass)
|
||
|
|
self.add_param('.0')
|
||
|
|
|
||
|
|
def get_names(self):
|
||
|
|
keys = Scope.get_names(self)
|
||
|
|
return keys
|
||
|
|
|
||
|
|
class LambdaScope(FunctionScope):
|
||
|
|
__super_init = Scope.__init__
|
||
|
|
|
||
|
|
__counter = 1
|
||
|
|
|
||
|
|
def __init__(self, module, klass=None):
|
||
|
|
i = self.__counter
|
||
|
|
self.__counter += 1
|
||
|
|
self.__super_init("lambda.%d" % i, module, klass)
|
||
|
|
|
||
|
|
class ClassScope(Scope):
|
||
|
|
__super_init = Scope.__init__
|
||
|
|
|
||
|
|
def __init__(self, name, module):
|
||
|
|
self.__super_init(name, module, name)
|
||
|
|
|
||
|
|
class SymbolVisitor:
|
||
|
|
def __init__(self):
|
||
|
|
self.scopes = {}
|
||
|
|
self.klass = None
|
||
|
|
|
||
|
|
# node that define new scopes
|
||
|
|
|
||
|
|
def visitModule(self, node):
|
||
|
|
scope = self.module = self.scopes[node] = ModuleScope()
|
||
|
|
self.visit(node.node, scope)
|
||
|
|
|
||
|
|
visitExpression = visitModule
|
||
|
|
|
||
|
|
def visitFunction(self, node, parent):
|
||
|
|
if node.decorators:
|
||
|
|
self.visit(node.decorators, parent)
|
||
|
|
parent.add_def(node.name)
|
||
|
|
for n in node.defaults:
|
||
|
|
self.visit(n, parent)
|
||
|
|
scope = FunctionScope(node.name, self.module, self.klass)
|
||
|
|
if parent.nested or isinstance(parent, FunctionScope):
|
||
|
|
scope.nested = 1
|
||
|
|
self.scopes[node] = scope
|
||
|
|
self._do_args(scope, node.argnames)
|
||
|
|
self.visit(node.code, scope)
|
||
|
|
self.handle_free_vars(scope, parent)
|
||
|
|
|
||
|
|
def visitGenExpr(self, node, parent):
|
||
|
|
scope = GenExprScope(self.module, self.klass);
|
||
|
|
if parent.nested or isinstance(parent, FunctionScope) \
|
||
|
|
or isinstance(parent, GenExprScope):
|
||
|
|
scope.nested = 1
|
||
|
|
|
||
|
|
self.scopes[node] = scope
|
||
|
|
self.visit(node.code, scope)
|
||
|
|
|
||
|
|
self.handle_free_vars(scope, parent)
|
||
|
|
|
||
|
|
def visitGenExprInner(self, node, scope):
|
||
|
|
for genfor in node.quals:
|
||
|
|
self.visit(genfor, scope)
|
||
|
|
|
||
|
|
self.visit(node.expr, scope)
|
||
|
|
|
||
|
|
def visitGenExprFor(self, node, scope):
|
||
|
|
self.visit(node.assign, scope, 1)
|
||
|
|
self.visit(node.iter, scope)
|
||
|
|
for if_ in node.ifs:
|
||
|
|
self.visit(if_, scope)
|
||
|
|
|
||
|
|
def visitGenExprIf(self, node, scope):
|
||
|
|
self.visit(node.test, scope)
|
||
|
|
|
||
|
|
def visitLambda(self, node, parent, assign=0):
|
||
|
|
# Lambda is an expression, so it could appear in an expression
|
||
|
|
# context where assign is passed. The transformer should catch
|
||
|
|
# any code that has a lambda on the left-hand side.
|
||
|
|
assert not assign
|
||
|
|
|
||
|
|
for n in node.defaults:
|
||
|
|
self.visit(n, parent)
|
||
|
|
scope = LambdaScope(self.module, self.klass)
|
||
|
|
if parent.nested or isinstance(parent, FunctionScope):
|
||
|
|
scope.nested = 1
|
||
|
|
self.scopes[node] = scope
|
||
|
|
self._do_args(scope, node.argnames)
|
||
|
|
self.visit(node.code, scope)
|
||
|
|
self.handle_free_vars(scope, parent)
|
||
|
|
|
||
|
|
def _do_args(self, scope, args):
|
||
|
|
for name in args:
|
||
|
|
if type(name) == types.TupleType:
|
||
|
|
self._do_args(scope, name)
|
||
|
|
else:
|
||
|
|
scope.add_param(name)
|
||
|
|
|
||
|
|
def handle_free_vars(self, scope, parent):
|
||
|
|
parent.add_child(scope)
|
||
|
|
scope.handle_children()
|
||
|
|
|
||
|
|
def visitClass(self, node, parent):
|
||
|
|
parent.add_def(node.name)
|
||
|
|
for n in node.bases:
|
||
|
|
self.visit(n, parent)
|
||
|
|
scope = ClassScope(node.name, self.module)
|
||
|
|
if parent.nested or isinstance(parent, FunctionScope):
|
||
|
|
scope.nested = 1
|
||
|
|
if node.doc is not None:
|
||
|
|
scope.add_def('__doc__')
|
||
|
|
scope.add_def('__module__')
|
||
|
|
self.scopes[node] = scope
|
||
|
|
prev = self.klass
|
||
|
|
self.klass = node.name
|
||
|
|
self.visit(node.code, scope)
|
||
|
|
self.klass = prev
|
||
|
|
self.handle_free_vars(scope, parent)
|
||
|
|
|
||
|
|
# name can be a def or a use
|
||
|
|
|
||
|
|
# XXX a few calls and nodes expect a third "assign" arg that is
|
||
|
|
# true if the name is being used as an assignment. only
|
||
|
|
# expressions contained within statements may have the assign arg.
|
||
|
|
|
||
|
|
def visitName(self, node, scope, assign=0):
|
||
|
|
if assign:
|
||
|
|
scope.add_def(node.name)
|
||
|
|
else:
|
||
|
|
scope.add_use(node.name)
|
||
|
|
|
||
|
|
# operations that bind new names
|
||
|
|
|
||
|
|
def visitFor(self, node, scope):
|
||
|
|
self.visit(node.assign, scope, 1)
|
||
|
|
self.visit(node.list, scope)
|
||
|
|
self.visit(node.body, scope)
|
||
|
|
if node.else_:
|
||
|
|
self.visit(node.else_, scope)
|
||
|
|
|
||
|
|
def visitFrom(self, node, scope):
|
||
|
|
for name, asname in node.names:
|
||
|
|
if name == "*":
|
||
|
|
continue
|
||
|
|
scope.add_def(asname or name)
|
||
|
|
|
||
|
|
def visitImport(self, node, scope):
|
||
|
|
for name, asname in node.names:
|
||
|
|
i = name.find(".")
|
||
|
|
if i > -1:
|
||
|
|
name = name[:i]
|
||
|
|
scope.add_def(asname or name)
|
||
|
|
|
||
|
|
def visitGlobal(self, node, scope):
|
||
|
|
for name in node.names:
|
||
|
|
scope.add_global(name)
|
||
|
|
|
||
|
|
def visitAssign(self, node, scope):
|
||
|
|
"""Propagate assignment flag down to child nodes.
|
||
|
|
|
||
|
|
The Assign node doesn't itself contains the variables being
|
||
|
|
assigned to. Instead, the children in node.nodes are visited
|
||
|
|
with the assign flag set to true. When the names occur in
|
||
|
|
those nodes, they are marked as defs.
|
||
|
|
|
||
|
|
Some names that occur in an assignment target are not bound by
|
||
|
|
the assignment, e.g. a name occurring inside a slice. The
|
||
|
|
visitor handles these nodes specially; they do not propagate
|
||
|
|
the assign flag to their children.
|
||
|
|
"""
|
||
|
|
for n in node.nodes:
|
||
|
|
self.visit(n, scope, 1)
|
||
|
|
self.visit(node.expr, scope)
|
||
|
|
|
||
|
|
def visitAssName(self, node, scope, assign=1):
|
||
|
|
scope.add_def(node.name)
|
||
|
|
|
||
|
|
def visitAssAttr(self, node, scope, assign=0):
|
||
|
|
self.visit(node.expr, scope, 0)
|
||
|
|
|
||
|
|
def visitSubscript(self, node, scope, assign=0):
|
||
|
|
self.visit(node.expr, scope, 0)
|
||
|
|
for n in node.subs:
|
||
|
|
self.visit(n, scope, 0)
|
||
|
|
|
||
|
|
def visitSlice(self, node, scope, assign=0):
|
||
|
|
self.visit(node.expr, scope, 0)
|
||
|
|
if node.lower:
|
||
|
|
self.visit(node.lower, scope, 0)
|
||
|
|
if node.upper:
|
||
|
|
self.visit(node.upper, scope, 0)
|
||
|
|
|
||
|
|
def visitAugAssign(self, node, scope):
|
||
|
|
# If the LHS is a name, then this counts as assignment.
|
||
|
|
# Otherwise, it's just use.
|
||
|
|
self.visit(node.node, scope)
|
||
|
|
if isinstance(node.node, ast.Name):
|
||
|
|
self.visit(node.node, scope, 1) # XXX worry about this
|
||
|
|
self.visit(node.expr, scope)
|
||
|
|
|
||
|
|
# prune if statements if tests are false
|
||
|
|
|
||
|
|
_const_types = types.StringType, types.IntType, types.FloatType
|
||
|
|
|
||
|
|
def visitIf(self, node, scope):
|
||
|
|
for test, body in node.tests:
|
||
|
|
if isinstance(test, ast.Const):
|
||
|
|
if type(test.value) in self._const_types:
|
||
|
|
if not test.value:
|
||
|
|
continue
|
||
|
|
self.visit(test, scope)
|
||
|
|
self.visit(body, scope)
|
||
|
|
if node.else_:
|
||
|
|
self.visit(node.else_, scope)
|
||
|
|
|
||
|
|
# a yield statement signals a generator
|
||
|
|
|
||
|
|
def visitYield(self, node, scope):
|
||
|
|
scope.generator = 1
|
||
|
|
self.visit(node.value, scope)
|
||
|
|
|
||
|
|
def list_eq(l1, l2):
|
||
|
|
return sorted(l1) == sorted(l2)
|
||
|
|
|
||
|
|
if __name__ == "__main__":
|
||
|
|
import sys
|
||
|
|
from compiler import parseFile, walk
|
||
|
|
import symtable
|
||
|
|
|
||
|
|
def get_names(syms):
|
||
|
|
return [s for s in [s.get_name() for s in syms.get_symbols()]
|
||
|
|
if not (s.startswith('_[') or s.startswith('.'))]
|
||
|
|
|
||
|
|
for file in sys.argv[1:]:
|
||
|
|
print file
|
||
|
|
f = open(file)
|
||
|
|
buf = f.read()
|
||
|
|
f.close()
|
||
|
|
syms = symtable.symtable(buf, file, "exec")
|
||
|
|
mod_names = get_names(syms)
|
||
|
|
tree = parseFile(file)
|
||
|
|
s = SymbolVisitor()
|
||
|
|
walk(tree, s)
|
||
|
|
|
||
|
|
# compare module-level symbols
|
||
|
|
names2 = s.scopes[tree].get_names()
|
||
|
|
|
||
|
|
if not list_eq(mod_names, names2):
|
||
|
|
print
|
||
|
|
print "oops", file
|
||
|
|
print sorted(mod_names)
|
||
|
|
print sorted(names2)
|
||
|
|
sys.exit(-1)
|
||
|
|
|
||
|
|
d = {}
|
||
|
|
d.update(s.scopes)
|
||
|
|
del d[tree]
|
||
|
|
scopes = d.values()
|
||
|
|
del d
|
||
|
|
|
||
|
|
for s in syms.get_symbols():
|
||
|
|
if s.is_namespace():
|
||
|
|
l = [sc for sc in scopes
|
||
|
|
if sc.name == s.get_name()]
|
||
|
|
if len(l) > 1:
|
||
|
|
print "skipping", s.get_name()
|
||
|
|
else:
|
||
|
|
if not list_eq(get_names(s.get_namespace()),
|
||
|
|
l[0].get_names()):
|
||
|
|
print s.get_name()
|
||
|
|
print sorted(get_names(s.get_namespace()))
|
||
|
|
print sorted(l[0].get_names())
|
||
|
|
sys.exit(-1)
|