diff options
Diffstat (limited to 'src/engine/SCons/Node/__init__.py')
| -rw-r--r-- | src/engine/SCons/Node/__init__.py | 133 |
1 files changed, 93 insertions, 40 deletions
diff --git a/src/engine/SCons/Node/__init__.py b/src/engine/SCons/Node/__init__.py index 627d020..b04284d 100644 --- a/src/engine/SCons/Node/__init__.py +++ b/src/engine/SCons/Node/__init__.py @@ -95,9 +95,55 @@ def do_nothing(node): pass Annotate = do_nothing -class BuildInfo: +# Classes for signature info for Nodes. + +class NodeInfo: + """ + A generic class for signature information for a Node. + + We actually expect that modules containing Node subclasses will also + subclass NodeInfo, to provide their own logic for dealing with their + own Node-specific signature information. + """ + def __init__(self): + """A null initializer so that subclasses have a superclass + initialization method to call for future use. + """ + pass def __cmp__(self, other): return cmp(self.__dict__, other.__dict__) + def update(self, node): + pass + def merge(self, other): + for key, val in other.__dict__.items(): + self.__dict__[key] = val + +class BuildInfo: + """ + The generic build information for a Node. + + This is what gets stored in a .sconsign file for each target file. + It contains a NodeInfo instance for this node (signature information + that's specific to the type of Node) and direct attributes for the + generic build stuff we have to track: sources, explicit dependencies, + implicit dependencies, and action information. + """ + def __init__(self, node): + self.ninfo = node.new_ninfo() + self.bsourcesigs = [] + self.bdependsigs = [] + self.bimplicitsigs = [] + self.bactsig = None + def __cmp__(self, other): + return cmp(self.ninfo, other.ninfo) + def merge(self, other): + for key, val in other.__dict__.items(): + try: + merge = self.__dict__[key].merge + except (AttributeError, KeyError): + self.__dict__[key] = val + else: + merge(val) class Node: """The base Node class, for entities that we know how to @@ -241,28 +287,27 @@ class Node: parent.del_binfo() try: - new_binfo = self.binfo + new = self.binfo except AttributeError: # Node arrived here without build info; apparently it # doesn't need it, so don't bother calculating or storing # it. - new_binfo = None + new = None # Reset this Node's cached state since it was just built and # various state has changed. self.clear() - - # Had build info, so it should be stored in the signature - # cache. However, if the build info included a content - # signature then it should be recalculated before being - # stored. - if new_binfo: - if hasattr(new_binfo, 'csig'): - new_binfo = self.gen_binfo() # sets self.binfo + if new: + # It had build info, so it should be stored in the signature + # cache. However, if the build info included a content + # signature then it must be recalculated before being stored. + if hasattr(new.ninfo, 'csig'): + self.get_csig() else: - self.binfo = new_binfo - self.store_info(new_binfo) + new.ninfo.update(self) + self.binfo = new + self.store_info(self.binfo) def add_to_waiting_parents(self, node): self.waiting_parents.append(node) @@ -285,7 +330,6 @@ class Node: """ self.executor_cleanup() self.del_binfo() - self.del_cinfo() try: delattr(self, '_calculated_sig') except AttributeError: @@ -504,6 +548,10 @@ class Node: return self.env = env + # + # SIGNATURE SUBSYSTEM + # + def calculator(self): import SCons.Defaults @@ -524,27 +572,30 @@ class Node: env = self.env or SCons.Defaults.DefaultEnvironment() if env.use_build_signature(): - return self.calc_bsig(calc) + return self.get_bsig(calc) elif not self.rexists(): return None - return self.calc_csig(calc) + return self.get_csig(calc) + + def new_ninfo(self): + return NodeInfo() def new_binfo(self): - return BuildInfo() + return BuildInfo(self) - def del_binfo(self): - """Delete the bsig from this node.""" + def get_binfo(self): try: - delattr(self, 'binfo') + return self.binfo except AttributeError: - pass + self.binfo = self.new_binfo() + return self.binfo - def calc_bsig(self, calc=None): + def del_binfo(self): + """Delete the build info from this node.""" try: - return self.binfo.bsig + delattr(self, 'binfo') except AttributeError: - self.binfo = self.gen_binfo(calc) - return self.binfo.bsig + pass def gen_binfo(self, calc=None, scan=1): """ @@ -565,7 +616,7 @@ class Node: if calc is None: calc = self.calculator() - binfo = self.new_binfo() + binfo = self.get_binfo() if scan: self.scan() @@ -602,29 +653,27 @@ class Node: binfo.bdependsigs = dependsigs binfo.bimplicitsigs = implicitsigs - binfo.bsig = calc.module.collect(filter(None, sigs)) + binfo.ninfo.bsig = calc.module.collect(filter(None, sigs)) return binfo - def del_cinfo(self): + def get_bsig(self, calc=None): + binfo = self.get_binfo() try: - del self.binfo.csig + return binfo.ninfo.bsig except AttributeError: - pass + self.binfo = self.gen_binfo(calc) + return self.binfo.ninfo.bsig - def calc_csig(self, calc=None): - try: - binfo = self.binfo - except AttributeError: - binfo = self.binfo = self.new_binfo() + def get_csig(self, calc=None): + binfo = self.get_binfo() try: - return binfo.csig + return binfo.ninfo.csig except AttributeError: if calc is None: calc = self.calculator() - binfo.csig = calc.module.signature(self) - self.store_info(binfo) - return binfo.csig + csig = binfo.ninfo.csig = calc.module.signature(self) + return csig def store_info(self, obj): """Make the build signature permanent (that is, store it in the @@ -638,6 +687,10 @@ class Node: """Fetch the stored implicit dependencies""" return None + # + # + # + def set_precious(self, precious = 1): """Set the Node's precious value.""" self.precious = precious @@ -915,7 +968,7 @@ class Node: except AttributeError: return "Cannot explain why `%s' is being rebuilt: No previous build information found\n" % self - new = self.binfo + new = self.get_binfo() nsig = {} dictify(nsig, new.bsources, new.bsourcesigs) |