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