mirror of https://gitee.com/openkylin/qemu.git
712 lines
23 KiB
Python
712 lines
23 KiB
Python
#
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# Mini-Kconfig parser
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#
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# Copyright (c) 2015 Red Hat Inc.
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#
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# Authors:
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# Paolo Bonzini <pbonzini@redhat.com>
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#
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# This work is licensed under the terms of the GNU GPL, version 2
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# or, at your option, any later version. See the COPYING file in
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# the top-level directory.
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from __future__ import print_function
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import os
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import sys
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import re
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import random
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__all__ = [ 'KconfigDataError', 'KconfigParserError',
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'KconfigData', 'KconfigParser' ,
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'defconfig', 'allyesconfig', 'allnoconfig', 'randconfig' ]
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def debug_print(*args):
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#print('# ' + (' '.join(str(x) for x in args)))
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pass
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# -------------------------------------------
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# KconfigData implements the Kconfig semantics. For now it can only
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# detect undefined symbols, i.e. symbols that were referenced in
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# assignments or dependencies but were not declared with "config FOO".
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#
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# Semantic actions are represented by methods called do_*. The do_var
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# method return the semantic value of a variable (which right now is
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# just its name).
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# -------------------------------------------
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class KconfigDataError(Exception):
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def __init__(self, msg):
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self.msg = msg
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def __str__(self):
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return self.msg
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allyesconfig = lambda x: True
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allnoconfig = lambda x: False
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defconfig = lambda x: x
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randconfig = lambda x: random.randint(0, 1) == 1
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class KconfigData:
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class Expr:
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def __and__(self, rhs):
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return KconfigData.AND(self, rhs)
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def __or__(self, rhs):
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return KconfigData.OR(self, rhs)
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def __invert__(self):
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return KconfigData.NOT(self)
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# Abstract methods
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def add_edges_to(self, var):
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pass
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def evaluate(self):
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assert False
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class AND(Expr):
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def __init__(self, lhs, rhs):
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self.lhs = lhs
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self.rhs = rhs
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def __str__(self):
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return "(%s && %s)" % (self.lhs, self.rhs)
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def add_edges_to(self, var):
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self.lhs.add_edges_to(var)
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self.rhs.add_edges_to(var)
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def evaluate(self):
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return self.lhs.evaluate() and self.rhs.evaluate()
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class OR(Expr):
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def __init__(self, lhs, rhs):
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self.lhs = lhs
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self.rhs = rhs
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def __str__(self):
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return "(%s || %s)" % (self.lhs, self.rhs)
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def add_edges_to(self, var):
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self.lhs.add_edges_to(var)
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self.rhs.add_edges_to(var)
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def evaluate(self):
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return self.lhs.evaluate() or self.rhs.evaluate()
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class NOT(Expr):
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def __init__(self, lhs):
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self.lhs = lhs
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def __str__(self):
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return "!%s" % (self.lhs)
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def add_edges_to(self, var):
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self.lhs.add_edges_to(var)
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def evaluate(self):
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return not self.lhs.evaluate()
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class Var(Expr):
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def __init__(self, name):
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self.name = name
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self.value = None
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self.outgoing = set()
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self.clauses_for_var = list()
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def __str__(self):
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return self.name
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def has_value(self):
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return not (self.value is None)
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def set_value(self, val, clause):
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self.clauses_for_var.append(clause)
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if self.has_value() and self.value != val:
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print("The following clauses were found for " + self.name)
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for i in self.clauses_for_var:
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print(" " + str(i), file=sys.stderr)
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raise KconfigDataError('contradiction between clauses when setting %s' % self)
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debug_print("=> %s is now %s" % (self.name, val))
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self.value = val
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# depth first search of the dependency graph
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def dfs(self, visited, f):
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if self in visited:
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return
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visited.add(self)
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for v in self.outgoing:
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v.dfs(visited, f)
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f(self)
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def add_edges_to(self, var):
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self.outgoing.add(var)
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def evaluate(self):
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if not self.has_value():
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raise KconfigDataError('cycle found including %s' % self)
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return self.value
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class Clause:
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def __init__(self, dest):
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self.dest = dest
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def priority(self):
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return 0
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def process(self):
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pass
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class AssignmentClause(Clause):
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def __init__(self, dest, value):
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KconfigData.Clause.__init__(self, dest)
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self.value = value
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def __str__(self):
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return "CONFIG_%s=%s" % (self.dest, 'y' if self.value else 'n')
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def process(self):
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self.dest.set_value(self.value, self)
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class DefaultClause(Clause):
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def __init__(self, dest, value, cond=None):
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KconfigData.Clause.__init__(self, dest)
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self.value = value
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self.cond = cond
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if not (self.cond is None):
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self.cond.add_edges_to(self.dest)
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def __str__(self):
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value = 'y' if self.value else 'n'
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if self.cond is None:
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return "config %s default %s" % (self.dest, value)
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else:
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return "config %s default %s if %s" % (self.dest, value, self.cond)
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def priority(self):
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# Defaults are processed just before leaving the variable
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return -1
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def process(self):
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if not self.dest.has_value() and \
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(self.cond is None or self.cond.evaluate()):
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self.dest.set_value(self.value, self)
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class DependsOnClause(Clause):
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def __init__(self, dest, expr):
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KconfigData.Clause.__init__(self, dest)
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self.expr = expr
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self.expr.add_edges_to(self.dest)
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def __str__(self):
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return "config %s depends on %s" % (self.dest, self.expr)
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def process(self):
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if not self.expr.evaluate():
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self.dest.set_value(False, self)
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class SelectClause(Clause):
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def __init__(self, dest, cond):
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KconfigData.Clause.__init__(self, dest)
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self.cond = cond
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self.cond.add_edges_to(self.dest)
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def __str__(self):
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return "select %s if %s" % (self.dest, self.cond)
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def process(self):
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if self.cond.evaluate():
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self.dest.set_value(True, self)
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def __init__(self, value_mangler=defconfig):
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self.value_mangler = value_mangler
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self.previously_included = []
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self.incl_info = None
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self.defined_vars = set()
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self.referenced_vars = dict()
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self.clauses = list()
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# semantic analysis -------------
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def check_undefined(self):
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undef = False
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for i in self.referenced_vars:
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if not (i in self.defined_vars):
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print("undefined symbol %s" % (i), file=sys.stderr)
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undef = True
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return undef
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def compute_config(self):
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if self.check_undefined():
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raise KconfigDataError("there were undefined symbols")
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return None
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debug_print("Input:")
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for clause in self.clauses:
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debug_print(clause)
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debug_print("\nDependency graph:")
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for i in self.referenced_vars:
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debug_print(i, "->", [str(x) for x in self.referenced_vars[i].outgoing])
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# The reverse of the depth-first order is the topological sort
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dfo = dict()
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visited = set()
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debug_print("\n")
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def visit_fn(var):
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debug_print(var, "has DFS number", len(dfo))
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dfo[var] = len(dfo)
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for name, v in self.referenced_vars.items():
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self.do_default(v, False)
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v.dfs(visited, visit_fn)
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# Put higher DFS numbers and higher priorities first. This
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# places the clauses in topological order and places defaults
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# after assignments and dependencies.
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self.clauses.sort(key=lambda x: (-dfo[x.dest], -x.priority()))
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debug_print("\nSorted clauses:")
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for clause in self.clauses:
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debug_print(clause)
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clause.process()
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debug_print("")
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values = dict()
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for name, v in self.referenced_vars.items():
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debug_print("Evaluating", name)
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values[name] = v.evaluate()
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return values
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# semantic actions -------------
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def do_declaration(self, var):
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if (var in self.defined_vars):
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raise KconfigDataError('variable "' + var + '" defined twice')
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self.defined_vars.add(var.name)
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# var is a string with the variable's name.
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def do_var(self, var):
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if (var in self.referenced_vars):
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return self.referenced_vars[var]
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var_obj = self.referenced_vars[var] = KconfigData.Var(var)
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return var_obj
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def do_assignment(self, var, val):
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self.clauses.append(KconfigData.AssignmentClause(var, val))
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def do_default(self, var, val, cond=None):
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val = self.value_mangler(val)
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self.clauses.append(KconfigData.DefaultClause(var, val, cond))
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def do_depends_on(self, var, expr):
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self.clauses.append(KconfigData.DependsOnClause(var, expr))
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def do_select(self, var, symbol, cond=None):
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cond = (cond & var) if cond is not None else var
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self.clauses.append(KconfigData.SelectClause(symbol, cond))
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def do_imply(self, var, symbol, cond=None):
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# "config X imply Y [if COND]" is the same as
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# "config Y default y if X [&& COND]"
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cond = (cond & var) if cond is not None else var
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self.do_default(symbol, True, cond)
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# -------------------------------------------
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# KconfigParser implements a recursive descent parser for (simplified)
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# Kconfig syntax.
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# -------------------------------------------
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# tokens table
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TOKENS = {}
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TOK_NONE = -1
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TOK_LPAREN = 0; TOKENS[TOK_LPAREN] = '"("';
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TOK_RPAREN = 1; TOKENS[TOK_RPAREN] = '")"';
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TOK_EQUAL = 2; TOKENS[TOK_EQUAL] = '"="';
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TOK_AND = 3; TOKENS[TOK_AND] = '"&&"';
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TOK_OR = 4; TOKENS[TOK_OR] = '"||"';
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TOK_NOT = 5; TOKENS[TOK_NOT] = '"!"';
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TOK_DEPENDS = 6; TOKENS[TOK_DEPENDS] = '"depends"';
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TOK_ON = 7; TOKENS[TOK_ON] = '"on"';
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TOK_SELECT = 8; TOKENS[TOK_SELECT] = '"select"';
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TOK_IMPLY = 9; TOKENS[TOK_IMPLY] = '"imply"';
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TOK_CONFIG = 10; TOKENS[TOK_CONFIG] = '"config"';
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TOK_DEFAULT = 11; TOKENS[TOK_DEFAULT] = '"default"';
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TOK_Y = 12; TOKENS[TOK_Y] = '"y"';
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TOK_N = 13; TOKENS[TOK_N] = '"n"';
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TOK_SOURCE = 14; TOKENS[TOK_SOURCE] = '"source"';
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TOK_BOOL = 15; TOKENS[TOK_BOOL] = '"bool"';
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TOK_IF = 16; TOKENS[TOK_IF] = '"if"';
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TOK_ID = 17; TOKENS[TOK_ID] = 'identifier';
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TOK_EOF = 18; TOKENS[TOK_EOF] = 'end of file';
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class KconfigParserError(Exception):
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def __init__(self, parser, msg, tok=None):
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self.loc = parser.location()
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tok = tok or parser.tok
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if tok != TOK_NONE:
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location = TOKENS.get(tok, None) or ('"%s"' % tok)
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msg = '%s before %s' % (msg, location)
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self.msg = msg
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def __str__(self):
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return "%s: %s" % (self.loc, self.msg)
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class KconfigParser:
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@classmethod
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def parse(self, fp, mode=None):
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data = KconfigData(mode or KconfigParser.defconfig)
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parser = KconfigParser(data)
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parser.parse_file(fp)
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return data
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def __init__(self, data):
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self.data = data
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def parse_file(self, fp):
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self.abs_fname = os.path.abspath(fp.name)
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self.fname = fp.name
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self.data.previously_included.append(self.abs_fname)
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self.src = fp.read()
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if self.src == '' or self.src[-1] != '\n':
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self.src += '\n'
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self.cursor = 0
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self.line = 1
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self.line_pos = 0
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self.get_token()
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self.parse_config()
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def do_assignment(self, var, val):
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if not var.startswith("CONFIG_"):
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raise Error('assigned variable should start with CONFIG_')
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var = self.data.do_var(var[7:])
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self.data.do_assignment(var, val)
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# file management -----
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def error_path(self):
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inf = self.data.incl_info
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res = ""
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while inf:
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res = ("In file included from %s:%d:\n" % (inf['file'],
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inf['line'])) + res
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inf = inf['parent']
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return res
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def location(self):
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col = 1
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for ch in self.src[self.line_pos:self.pos]:
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if ch == '\t':
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col += 8 - ((col - 1) % 8)
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else:
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col += 1
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return '%s%s:%d:%d' %(self.error_path(), self.fname, self.line, col)
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def do_include(self, include):
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incl_abs_fname = os.path.join(os.path.dirname(self.abs_fname),
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include)
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# catch inclusion cycle
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inf = self.data.incl_info
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while inf:
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if incl_abs_fname == os.path.abspath(inf['file']):
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raise KconfigParserError(self, "Inclusion loop for %s"
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% include)
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inf = inf['parent']
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# skip multiple include of the same file
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if incl_abs_fname in self.data.previously_included:
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return
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try:
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fp = open(incl_abs_fname, 'r')
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except IOError as e:
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raise KconfigParserError(self,
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'%s: %s' % (e.strerror, include))
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inf = self.data.incl_info
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self.data.incl_info = { 'file': self.fname, 'line': self.line,
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'parent': inf }
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KconfigParser(self.data).parse_file(fp)
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self.data.incl_info = inf
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# recursive descent parser -----
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# y_or_n: Y | N
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def parse_y_or_n(self):
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if self.tok == TOK_Y:
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self.get_token()
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return True
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if self.tok == TOK_N:
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self.get_token()
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return False
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raise KconfigParserError(self, 'Expected "y" or "n"')
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# var: ID
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def parse_var(self):
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if self.tok == TOK_ID:
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val = self.val
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self.get_token()
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return self.data.do_var(val)
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else:
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raise KconfigParserError(self, 'Expected identifier')
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# assignment_var: ID (starting with "CONFIG_")
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def parse_assignment_var(self):
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if self.tok == TOK_ID:
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val = self.val
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if not val.startswith("CONFIG_"):
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raise KconfigParserError(self,
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'Expected identifier starting with "CONFIG_"', TOK_NONE)
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self.get_token()
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return self.data.do_var(val[7:])
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else:
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raise KconfigParserError(self, 'Expected identifier')
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# assignment: var EQUAL y_or_n
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def parse_assignment(self):
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var = self.parse_assignment_var()
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if self.tok != TOK_EQUAL:
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raise KconfigParserError(self, 'Expected "="')
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self.get_token()
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self.data.do_assignment(var, self.parse_y_or_n())
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# primary: NOT primary
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# | LPAREN expr RPAREN
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# | var
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def parse_primary(self):
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if self.tok == TOK_NOT:
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self.get_token()
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val = ~self.parse_primary()
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elif self.tok == TOK_LPAREN:
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self.get_token()
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val = self.parse_expr()
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if self.tok != TOK_RPAREN:
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raise KconfigParserError(self, 'Expected ")"')
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self.get_token()
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elif self.tok == TOK_ID:
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val = self.parse_var()
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else:
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raise KconfigParserError(self, 'Expected "!" or "(" or identifier')
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return val
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# disj: primary (OR primary)*
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def parse_disj(self):
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lhs = self.parse_primary()
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while self.tok == TOK_OR:
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self.get_token()
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lhs = lhs | self.parse_primary()
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return lhs
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# expr: disj (AND disj)*
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def parse_expr(self):
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lhs = self.parse_disj()
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while self.tok == TOK_AND:
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self.get_token()
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lhs = lhs & self.parse_disj()
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return lhs
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# condition: IF expr
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# | empty
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def parse_condition(self):
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if self.tok == TOK_IF:
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self.get_token()
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return self.parse_expr()
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else:
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return None
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# property: DEFAULT y_or_n condition
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# | DEPENDS ON expr
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# | SELECT var condition
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# | BOOL
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def parse_property(self, var):
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if self.tok == TOK_DEFAULT:
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self.get_token()
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val = self.parse_y_or_n()
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cond = self.parse_condition()
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self.data.do_default(var, val, cond)
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|
elif self.tok == TOK_DEPENDS:
|
|
self.get_token()
|
|
if self.tok != TOK_ON:
|
|
raise KconfigParserError(self, 'Expected "on"')
|
|
self.get_token()
|
|
self.data.do_depends_on(var, self.parse_expr())
|
|
elif self.tok == TOK_SELECT:
|
|
self.get_token()
|
|
symbol = self.parse_var()
|
|
cond = self.parse_condition()
|
|
self.data.do_select(var, symbol, cond)
|
|
elif self.tok == TOK_IMPLY:
|
|
self.get_token()
|
|
symbol = self.parse_var()
|
|
cond = self.parse_condition()
|
|
self.data.do_imply(var, symbol, cond)
|
|
elif self.tok == TOK_BOOL:
|
|
self.get_token()
|
|
else:
|
|
raise KconfigParserError(self, 'Error in recursive descent?')
|
|
|
|
# properties: properties property
|
|
# | /* empty */
|
|
def parse_properties(self, var):
|
|
had_default = False
|
|
while self.tok == TOK_DEFAULT or self.tok == TOK_DEPENDS or \
|
|
self.tok == TOK_SELECT or self.tok == TOK_BOOL or \
|
|
self.tok == TOK_IMPLY:
|
|
self.parse_property(var)
|
|
|
|
# for nicer error message
|
|
if self.tok != TOK_SOURCE and self.tok != TOK_CONFIG and \
|
|
self.tok != TOK_ID and self.tok != TOK_EOF:
|
|
raise KconfigParserError(self, 'expected "source", "config", identifier, '
|
|
+ '"default", "depends on", "imply" or "select"')
|
|
|
|
# declaration: config var properties
|
|
def parse_declaration(self):
|
|
if self.tok == TOK_CONFIG:
|
|
self.get_token()
|
|
var = self.parse_var()
|
|
self.data.do_declaration(var)
|
|
self.parse_properties(var)
|
|
else:
|
|
raise KconfigParserError(self, 'Error in recursive descent?')
|
|
|
|
# clause: SOURCE
|
|
# | declaration
|
|
# | assignment
|
|
def parse_clause(self):
|
|
if self.tok == TOK_SOURCE:
|
|
val = self.val
|
|
self.get_token()
|
|
self.do_include(val)
|
|
elif self.tok == TOK_CONFIG:
|
|
self.parse_declaration()
|
|
elif self.tok == TOK_ID:
|
|
self.parse_assignment()
|
|
else:
|
|
raise KconfigParserError(self, 'expected "source", "config" or identifier')
|
|
|
|
# config: clause+ EOF
|
|
def parse_config(self):
|
|
while self.tok != TOK_EOF:
|
|
self.parse_clause()
|
|
return self.data
|
|
|
|
# scanner -----
|
|
|
|
def get_token(self):
|
|
while True:
|
|
self.tok = self.src[self.cursor]
|
|
self.pos = self.cursor
|
|
self.cursor += 1
|
|
|
|
self.val = None
|
|
self.tok = self.scan_token()
|
|
if self.tok is not None:
|
|
return
|
|
|
|
def check_keyword(self, rest):
|
|
if not self.src.startswith(rest, self.cursor):
|
|
return False
|
|
length = len(rest)
|
|
if self.src[self.cursor + length].isalnum() or self.src[self.cursor + length] == '_':
|
|
return False
|
|
self.cursor += length
|
|
return True
|
|
|
|
def scan_token(self):
|
|
if self.tok == '#':
|
|
self.cursor = self.src.find('\n', self.cursor)
|
|
return None
|
|
elif self.tok == '=':
|
|
return TOK_EQUAL
|
|
elif self.tok == '(':
|
|
return TOK_LPAREN
|
|
elif self.tok == ')':
|
|
return TOK_RPAREN
|
|
elif self.tok == '&' and self.src[self.pos+1] == '&':
|
|
self.cursor += 1
|
|
return TOK_AND
|
|
elif self.tok == '|' and self.src[self.pos+1] == '|':
|
|
self.cursor += 1
|
|
return TOK_OR
|
|
elif self.tok == '!':
|
|
return TOK_NOT
|
|
elif self.tok == 'd' and self.check_keyword("epends"):
|
|
return TOK_DEPENDS
|
|
elif self.tok == 'o' and self.check_keyword("n"):
|
|
return TOK_ON
|
|
elif self.tok == 's' and self.check_keyword("elect"):
|
|
return TOK_SELECT
|
|
elif self.tok == 'i' and self.check_keyword("mply"):
|
|
return TOK_IMPLY
|
|
elif self.tok == 'c' and self.check_keyword("onfig"):
|
|
return TOK_CONFIG
|
|
elif self.tok == 'd' and self.check_keyword("efault"):
|
|
return TOK_DEFAULT
|
|
elif self.tok == 'b' and self.check_keyword("ool"):
|
|
return TOK_BOOL
|
|
elif self.tok == 'i' and self.check_keyword("f"):
|
|
return TOK_IF
|
|
elif self.tok == 'y' and self.check_keyword(""):
|
|
return TOK_Y
|
|
elif self.tok == 'n' and self.check_keyword(""):
|
|
return TOK_N
|
|
elif (self.tok == 's' and self.check_keyword("ource")) or \
|
|
self.tok == 'i' and self.check_keyword("nclude"):
|
|
# source FILENAME
|
|
# include FILENAME
|
|
while self.src[self.cursor].isspace():
|
|
self.cursor += 1
|
|
start = self.cursor
|
|
self.cursor = self.src.find('\n', self.cursor)
|
|
self.val = self.src[start:self.cursor]
|
|
return TOK_SOURCE
|
|
elif self.tok.isalpha():
|
|
# identifier
|
|
while self.src[self.cursor].isalnum() or self.src[self.cursor] == '_':
|
|
self.cursor += 1
|
|
self.val = self.src[self.pos:self.cursor]
|
|
return TOK_ID
|
|
elif self.tok == '\n':
|
|
if self.cursor == len(self.src):
|
|
return TOK_EOF
|
|
self.line += 1
|
|
self.line_pos = self.cursor
|
|
elif not self.tok.isspace():
|
|
raise KconfigParserError(self, 'invalid input')
|
|
|
|
return None
|
|
|
|
if __name__ == '__main__':
|
|
argv = sys.argv
|
|
mode = defconfig
|
|
if len(sys.argv) > 1:
|
|
if argv[1] == '--defconfig':
|
|
del argv[1]
|
|
elif argv[1] == '--randconfig':
|
|
random.seed()
|
|
mode = randconfig
|
|
del argv[1]
|
|
elif argv[1] == '--allyesconfig':
|
|
mode = allyesconfig
|
|
del argv[1]
|
|
elif argv[1] == '--allnoconfig':
|
|
mode = allnoconfig
|
|
del argv[1]
|
|
|
|
if len(argv) == 1:
|
|
print ("%s: at least one argument is required" % argv[0], file=sys.stderr)
|
|
sys.exit(1)
|
|
|
|
if argv[1].startswith('-'):
|
|
print ("%s: invalid option %s" % (argv[0], argv[1]), file=sys.stderr)
|
|
sys.exit(1)
|
|
|
|
data = KconfigData(mode)
|
|
parser = KconfigParser(data)
|
|
external_vars = set()
|
|
for arg in argv[3:]:
|
|
m = re.match(r'^(CONFIG_[A-Z0-9_]+)=([yn]?)$', arg)
|
|
if m is not None:
|
|
name, value = m.groups()
|
|
parser.do_assignment(name, value == 'y')
|
|
external_vars.add(name[7:])
|
|
else:
|
|
fp = open(arg, 'r')
|
|
parser.parse_file(fp)
|
|
fp.close()
|
|
|
|
config = data.compute_config()
|
|
for key in sorted(config.keys()):
|
|
if key not in external_vars and config[key]:
|
|
print ('CONFIG_%s=y' % key)
|
|
|
|
deps = open(argv[2], 'w')
|
|
for fname in data.previously_included:
|
|
print ('%s: %s' % (argv[1], fname), file=deps)
|
|
deps.close()
|