| # |
| # Small helper library to read and manipulate kernel Makefiles |
| # |
| |
| import os, re |
| |
| obj_line = re.compile(r'^obj-(?P<dep>[^\s+:=]*)\s*[+:]?=\s*(?P<tgt>[^\\]*)\s*(?P<cont>\\?)') |
| |
| class MakeTree(object): |
| def __init__(self, rootfile): |
| self.basedir = os.path.dirname(rootfile) |
| self.rootfile = os.path.basename(rootfile) |
| self._no_syms = [] |
| self._walked = False |
| self._found_makefiles = [] |
| |
| def _check_for_sym(self, f, sym): |
| # re-read Makefile to see if it declared this symbol ... |
| r = re.compile('^%s-(y|objs)\s*[+:]?=' % sym) |
| for l in open(os.path.join(self.basedir, f), 'r'): |
| if r.match(l): |
| # FIXME: check if symbol dependencies can be satisfied! |
| return True |
| return False |
| |
| def _walk(self, f=None, subdir='', sym=None): |
| if self._walked: |
| return |
| if not os.path.exists(os.path.join(self.basedir, subdir, f)): |
| #print "no %s" % os.path.join(self.basedir, subdir, f) |
| assert not sym is None |
| self._no_syms.append(sym) |
| return |
| self._found_makefiles.append(os.path.join(self.basedir, subdir, f)) |
| for l in open(os.path.join(self.basedir, subdir, f), 'r'): |
| m = obj_line.match(l) |
| if not m: |
| continue |
| dep = m.group('dep') |
| if dep[:2] == '$(': |
| if dep[-1] != ')': |
| raise Exception("Couldn't parse make dependency %s" % dep) |
| dep = dep[2:-1] |
| tgt = m.group('tgt') |
| for t in tgt.strip().split(): |
| t = t.strip() |
| if not t: |
| continue |
| if t[-1] == '/': |
| self._walk(f='Makefile', subdir=os.path.join(subdir, t), sym=dep) |
| elif t[-2:] == '.o': |
| t = t[:-2] + '.c' |
| if not os.path.exists(os.path.join(self.basedir, subdir, t)): |
| if not self._check_for_sym(os.path.join(subdir, f), t[:-2]): |
| self._no_syms.append(dep) |
| else: |
| assert False |
| # FIXME: consider continuation lines! |
| |
| def get_impossible_symbols(self): |
| self._walk(self.rootfile) |
| return self._no_syms |
| |
| def get_makefiles(self): |
| self._walk(self.rootfile) |
| return self._found_makefiles |
