diff options
Diffstat (limited to 'src/engine/SCons/Node/FS.py')
| -rw-r--r-- | src/engine/SCons/Node/FS.py | 139 |
1 files changed, 130 insertions, 9 deletions
diff --git a/src/engine/SCons/Node/FS.py b/src/engine/SCons/Node/FS.py index 18400e8..aaa5b47 100644 --- a/src/engine/SCons/Node/FS.py +++ b/src/engine/SCons/Node/FS.py @@ -2398,6 +2398,8 @@ class File(Base): self.scanner_paths = {} if not hasattr(self, '_local'): self._local = 0 + if not hasattr(self, 'released_target_info'): + self.released_target_info = False # If there was already a Builder set on this entry, then # we need to make sure we call the target-decider function, @@ -2725,7 +2727,7 @@ class File(Base): return self.get_build_env().get_CacheDir().retrieve(self) def visited(self): - if self.exists(): + if self.exists() and self.executor is not None: self.get_build_env().get_CacheDir().push_if_forced(self) ninfo = self.get_ninfo() @@ -2747,6 +2749,58 @@ class File(Base): self.store_info() + def release_target_info(self): + """Called just after this node has been marked + up-to-date or was built completely. + + This is where we try to release as many target node infos + as possible for clean builds and update runs, in order + to minimize the overall memory consumption. + + We'd like to remove a lot more attributes like self.sources + and self.sources_set, but they might get used + in a next build step. For example, during configuration + the source files for a built *.o file are used to figure out + which linker to use for the resulting Program (gcc vs. g++)! + That's why we check for the 'keep_targetinfo' attribute, + config Nodes and the Interactive mode just don't allow + an early release of most variables. + + In the same manner, we can't simply remove the self.attributes + here. The smart linking relies on the shared flag, and some + parts of the java Tool use it to transport information + about nodes... + + @see: built() and Node.release_target_info() + """ + if (self.released_target_info or SCons.Node.interactive): + return + + if not hasattr(self.attributes, 'keep_targetinfo'): + # Cache some required values, before releasing + # stuff like env, executor and builder... + self.changed() + self.get_contents_sig() + self.get_build_env() + # Now purge unneeded stuff to free memory... + self.executor = None + self._memo.pop('rfile', None) + self.prerequisites = None + # Cleanup lists, but only if they're empty + if not len(self.ignore_set): + self.ignore_set = None + if not len(self.implicit_set): + self.implicit_set = None + if not len(self.depends_set): + self.depends_set = None + if not len(self.ignore): + self.ignore = None + if not len(self.depends): + self.depends = None + # Mark this node as done, we only have to release + # the memory once... + self.released_target_info = True + def find_src_builder(self): if self.rexists(): return None @@ -2957,6 +3011,48 @@ class File(Base): SCons.Node.Node.builder_set(self, builder) self.changed_since_last_build = self.decide_target + def built(self): + """Called just after this File node is successfully built. + + Just like for 'release_target_info' we try to release + some more target node attributes in order to minimize the + overall memory consumption. + + @see: release_target_info + """ + + SCons.Node.Node.built(self) + + if not hasattr(self.attributes, 'keep_targetinfo'): + # Ensure that the build infos get computed and cached... + self.store_info() + # ... then release some more variables. + self._specific_sources = False + self.labspath = None + self._save_str() + self.cwd = None + + self.scanner_paths = None + + def changed(self, node=None): + """ + Returns if the node is up-to-date with respect to the BuildInfo + stored last time it was built. + + For File nodes this is basically a wrapper around Node.changed(), + but we allow the return value to get cached after the reference + to the Executor got released in release_target_info(). + """ + if node is None: + try: + return self._memo['changed'] + except KeyError: + pass + + has_changed = SCons.Node.Node.changed(self, node) + self._memo['changed'] = has_changed + return has_changed + def changed_content(self, target, prev_ni): cur_csig = self.get_csig() try: @@ -3090,25 +3186,50 @@ class File(Base): self.cachedir_csig = self.get_csig() return self.cachedir_csig + def get_contents_sig(self): + """ + A helper method for get_cachedir_bsig. + + It computes and returns the signature for this + node's contents. + """ + + try: + return self.contentsig + except AttributeError: + pass + + executor = self.get_executor() + + result = self.contentsig = SCons.Util.MD5signature(executor.get_contents()) + return result + def get_cachedir_bsig(self): + """ + Return the signature for a cached file, including + its children. + + It adds the path of the cached file to the cache signature, + because multiple targets built by the same action will all + have the same build signature, and we have to differentiate + them somehow. + """ try: return self.cachesig except AttributeError: pass - - # Add the path to the cache signature, because multiple - # targets built by the same action will all have the same - # build signature, and we have to differentiate them somehow. + + # Collect signatures for all children children = self.children() - executor = self.get_executor() - # sigs = [n.get_cachedir_csig() for n in children] sigs = [n.get_cachedir_csig() for n in children] - sigs.append(SCons.Util.MD5signature(executor.get_contents())) + # Append this node's signature... + sigs.append(self.get_contents_sig()) + # ...and it's path sigs.append(self.path) + # Merge this all into a single signature result = self.cachesig = SCons.Util.MD5collect(sigs) return result - default_fs = None def get_default_fs(): |