Stop adding incompatible task data into the same dict objects

TODO

@@ -1,7 +1,6 @@
 Waf 1.9
 -------
 
-* Reduce the key size in bld.task_sigs
 * Provide a more efficient ConfigSet implementation
 * Ensure _cache.py are valid python files
 * Rework qt5
@@ -25,4 +24,5 @@ Done
 * Remove Node.cache_sig and Node.sig #1580
 * Remove __hash__ and __eq__ from Node and Task #1629
 * Set cflags in the beginning / cppflags at the end #1505
+* Reduce the key size in bld.task_sigs by adding bld.node_sigs and bld.imp_sigs
 

playground/dynamic_headers/wscript

@@ -73,7 +73,7 @@ def runnable_status(self):
 		if add:
 			# recompute the task signature
 			delattr(self, 'cache_sig')
-			del bld.task_sigs[(self.uid(), 'imp')]
+			del bld.imp_sigs[self.uid()]
 			return self.runnable_status()
 
 		for x in bld.node_deps[self.uid()]:

waflib/Build.py

@@ -29,8 +29,8 @@ INSTALL = 1337
 UNINSTALL = -1337
 """Negative value '<-' uninstall, see :py:attr:`waflib.Build.BuildContext.is_install`"""
 
-SAVED_ATTRS = 'root node_deps raw_deps task_sigs'.split()
-"""Build class members to save between the runs (root, node_deps, raw_deps, task_sigs)"""
+SAVED_ATTRS = 'root node_sigs task_sigs imp_sigs raw_deps node_deps'.split()
+"""Build class members to save between the runs (root, node_sigs, task_sigs, node_sigs, imp_sigs, raw_deps, node_deps)"""
 
 CFG_FILES = 'cfg_files'
 """Files from the build directory to hash before starting the build (``config.h`` written during the configuration)"""
@@ -80,14 +80,20 @@ class BuildContext(Context.Context):
 		# ======================================= #
 		# cache variables
 
+		self.node_sigs = {}
+		"""Dict mapping build nodes to task identifier (uid), it indicates whether a task created a particular file (persists between builds)"""
+
 		self.task_sigs = {}
-		"""Signatures of the tasks (persists between build executions)"""
+		"""Dict mapping task identifiers (uid) to task signatures (persists between builds)"""
+
+		self.imp_sigs = {}
+		"""Dict mapping task identifiers (uid) to implicit task dependencies used for scanning targets (persists between builds)"""
 
 		self.node_deps = {}
-		"""Dict of node dependencies found by :py:meth:`waflib.Task.Task.scan` (persists between build executions)"""
+		"""Dict mapping task identifiers (uid) to node dependencies found by :py:meth:`waflib.Task.Task.scan` (persists between builds)"""
 
 		self.raw_deps = {}
-		"""Dict of custom data returned by :py:meth:`waflib.Task.Task.scan` (persists between build executions)"""
+		"""Dict mapping task identifiers (uid) to custom data returned by :py:meth:`waflib.Task.Task.scan` (persists between builds)"""
 
 		# list of folders that are already scanned
 		# so that we do not need to stat them one more time
@@ -1214,7 +1220,7 @@ class CleanContext(BuildContext):
 				n.delete()
 		self.root.children = {}
 
-		for v in 'node_deps task_sigs raw_deps'.split():
+		for v in 'node_sigs task_sigs imp_sigs raw_deps node_deps'.split():
 			setattr(self, v, {})
 
 class ListContext(BuildContext):

waflib/Node.py

@@ -816,7 +816,7 @@ class Node(object):
 		the signature calculation relies on an existing attribute. Else the
 		signature is calculated automatically.
 		"""
-		# previous behaviour can be set by returning self.ctx.task_sigs[self] when a build node
+		# previous behaviour can be set by returning self.ctx.node_sigs[self] when a build node
 		return Utils.h_file(self.abspath())
 
 	# --------------------------------------------

waflib/Runner.py

@@ -280,9 +280,8 @@ class Parallel(object):
 		"""
 		if hasattr(tsk, 'scan') and hasattr(tsk, 'uid'):
 			# TODO waf 1.9 - this breaks encapsulation
-			key = (tsk.uid(), 'imp')
 			try:
-				del self.bld.task_sigs[key]
+				del self.bld.imp_sigs[tsk.uid()]
 			except KeyError:
 				pass
 		if not self.bld.keep:

waflib/Task.py

@@ -607,7 +607,7 @@ class Task(TaskBase):
 
 		# compare the signatures of the outputs
 		for node in self.outputs:
-			sig = bld.task_sigs.get(node, None)
+			sig = bld.node_sigs.get(node, None)
 			if not sig:
 				Logs.debug("task: task %r must run: an output node has no signature" % self)
 				return RUN_ME
@@ -628,14 +628,14 @@ class Task(TaskBase):
 		The node signature is obtained from the task signature, but the output nodes may also get the signature
 		of their contents. See the class decorator :py:func:`waflib.Task.update_outputs` if you need this behaviour.
 		"""
-		dct = self.generator.bld.task_sigs
+		bld = self.generator.bld
 		for node in self.outputs:
 			if not node.exists():
 				self.hasrun = MISSING
 				self.err_msg = '-> missing file: %r' % node.abspath()
 				raise Errors.WafError(self.err_msg)
-			dct[node] = self.uid() # make sure this task produced the files in question
-		dct[self.uid()] = self.signature()
+			bld.node_sigs[node] = self.uid() # make sure this task produced the files in question
+		bld.task_sigs[self.uid()] = self.signature()
 
 	def sig_explicit_deps(self):
 		"""
@@ -729,7 +729,7 @@ class Task(TaskBase):
 
 		# get the task signatures from previous runs
 		key = self.uid()
-		prev = bld.task_sigs.get((key, 'imp'), [])
+		prev = bld.imp_sigs.get(key, [])
 
 		# for issue #379
 		if prev:
@@ -751,7 +751,7 @@ class Task(TaskBase):
 								del x.parent.children[x.name]
 							except KeyError:
 								pass
-			del bld.task_sigs[(key, 'imp')]
+			del bld.imp_sigs[key]
 			raise Errors.TaskRescan('rescan')
 
 		# no previous run or the signature of the dependencies has changed, rescan the dependencies
@@ -768,7 +768,7 @@ class Task(TaskBase):
 
 		# recompute the signature and return it
 		try:
-			bld.task_sigs[(key, 'imp')] = sig = self.compute_sig_implicit_deps()
+			bld.imp_sigs[key] = sig = self.compute_sig_implicit_deps()
 		except Exception:
 			if Logs.verbose:
 				for k in bld.node_deps.get(self.uid(), []):

waflib/Tools/javaw.py

@@ -301,7 +301,7 @@ class javac(Task.Task):
 		"""
 		"""
 		for node in self.generator.outdir.ant_glob('**/*.class'):
-			bld.task_sigs[node] = self.uid()
+			bld.node_sigs[node] = self.uid()
 		self.generator.bld.task_sigs[self.uid()] = self.cache_sig
 
 @feature('javadoc')
@@ -351,7 +351,7 @@ class javadoc(Task.Task):
 	def post_run(self):
 		nodes = self.generator.javadoc_output.ant_glob('**')
 		for nodes in nodes:
-			bld.task_sigs[node] = self.uid()
+			bld.node_sigs[node] = self.uid()
 		self.generator.bld.task_sigs[self.uid()] = self.cache_sig
 
 def configure(self):

waflib/extras/doxygen.py

@@ -148,7 +148,7 @@ class doxygen(Task.Task):
 	def post_run(self):
 		nodes = self.output_dir.ant_glob('**/*', quiet=True)
 		for x in nodes:
-			self.generator.bld.task_sigs[x.abspath()] = self.uid()
+			self.generator.bld.node_sigs[x] = self.uid()
 		self.add_install()
 		return Task.Task.post_run(self)