Source code for waflib.Task

#!/usr/bin/env python
# encoding: utf-8
# Thomas Nagy, 2005-2018 (ita)

"""
Tasks represent atomic operations such as processes.
"""

import os, re, sys, tempfile, traceback
from waflib import Utils, Logs, Errors

# task states
NOT_RUN = 0
"""The task was not executed yet"""

MISSING = 1
"""The task has been executed but the files have not been created"""

CRASHED = 2
"""The task execution returned a non-zero exit status"""

EXCEPTION = 3
"""An exception occurred in the task execution"""

CANCELED = 4
"""A dependency for the task is missing so it was cancelled"""

SKIPPED = 8
"""The task did not have to be executed"""

SUCCESS = 9
"""The task was successfully executed"""

ASK_LATER = -1
"""The task is not ready to be executed"""

SKIP_ME = -2
"""The task does not need to be executed"""

RUN_ME = -3
"""The task must be executed"""

CANCEL_ME = -4
"""The task cannot be executed because of a dependency problem"""

COMPILE_TEMPLATE_SHELL = '''
def f(tsk):
	env = tsk.env
	gen = tsk.generator
	bld = gen.bld
	cwdx = tsk.get_cwd()
	p = env.get_flat
	def to_list(xx):
		if isinstance(xx, str): return [xx]
		return xx
	tsk.last_cmd = cmd = \'\'\' %s \'\'\' % s
	return tsk.exec_command(cmd, cwd=cwdx, env=env.env or None)
'''

COMPILE_TEMPLATE_NOSHELL = '''
def f(tsk):
	env = tsk.env
	gen = tsk.generator
	bld = gen.bld
	cwdx = tsk.get_cwd()
	def to_list(xx):
		if isinstance(xx, str): return [xx]
		return xx
	def merge(lst1, lst2):
		if lst1 and lst2:
			return lst1[:-1] + [lst1[-1] + lst2[0]] + lst2[1:]
		return lst1 + lst2
	lst = []
	%s
	if '' in lst:
		lst = [x for x in lst if x]
	tsk.last_cmd = lst
	return tsk.exec_command(lst, cwd=cwdx, env=env.env or None)
'''

COMPILE_TEMPLATE_SIG_VARS = '''
def f(tsk):
	sig = tsk.generator.bld.hash_env_vars(tsk.env, tsk.vars)
	tsk.m.update(sig)
	env = tsk.env
	gen = tsk.generator
	bld = gen.bld
	cwdx = tsk.get_cwd()
	p = env.get_flat
	buf = []
	%s
	tsk.m.update(repr(buf).encode())
'''

classes = {}
"""
The metaclass :py:class:`waflib.Task.store_task_type` stores all class tasks
created by user scripts or Waf tools to this dict. It maps class names to class objects.
"""

[docs]class store_task_type(type): """ Metaclass: store the task classes into the dict pointed by the class attribute 'register' which defaults to :py:const:`waflib.Task.classes`, The attribute 'run_str' is compiled into a method 'run' bound to the task class. """ def __init__(cls, name, bases, dict): super(store_task_type, cls).__init__(name, bases, dict) name = cls.__name__ if name != 'evil' and name != 'Task': if getattr(cls, 'run_str', None): # if a string is provided, convert it to a method (f, dvars) = compile_fun(cls.run_str, cls.shell) cls.hcode = Utils.h_cmd(cls.run_str) cls.orig_run_str = cls.run_str # change the name of run_str or it is impossible to subclass with a function cls.run_str = None cls.run = f # process variables cls.vars = list(set(cls.vars + dvars)) cls.vars.sort() if cls.vars: fun = compile_sig_vars(cls.vars) if fun: cls.sig_vars = fun elif getattr(cls, 'run', None) and not 'hcode' in cls.__dict__: # getattr(cls, 'hcode') would look in the upper classes cls.hcode = Utils.h_cmd(cls.run) # be creative getattr(cls, 'register', classes)[name] = cls
evil = store_task_type('evil', (object,), {}) "Base class provided to avoid writing a metaclass, so the code can run in python 2.6 and 3.x unmodified"
[docs]class Task(evil): """ Task objects represents actions to perform such as commands to execute by calling the `run` method. Detecting when to execute a task occurs in the method :py:meth:`waflib.Task.Task.runnable_status`. Detecting which tasks to execute is performed through a hash value returned by :py:meth:`waflib.Task.Task.signature`. The task signature is persistent from build to build. """ vars = [] """ConfigSet variables that should trigger a rebuild (class attribute used for :py:meth:`waflib.Task.Task.sig_vars`)""" always_run = False """Specify whether task instances must always be executed or not (class attribute)""" shell = False """Execute the command with the shell (class attribute)""" color = 'GREEN' """Color for the console display, see :py:const:`waflib.Logs.colors_lst`""" ext_in = [] """File extensions that objects of this task class may use""" ext_out = [] """File extensions that objects of this task class may create""" before = [] """The instances of this class are executed before the instances of classes whose names are in this list""" after = [] """The instances of this class are executed after the instances of classes whose names are in this list""" hcode = Utils.SIG_NIL """String representing an additional hash for the class representation""" keep_last_cmd = False """Whether to keep the last command executed on the instance after execution. This may be useful for certain extensions but it can a lot of memory. """ weight = 0 """Optional weight to tune the priority for task instances. The higher, the earlier. The weight only applies to single task objects.""" tree_weight = 0 """Optional weight to tune the priority of task instances and whole subtrees. The higher, the earlier.""" prio_order = 0 """Priority order set by the scheduler on instances during the build phase. You most likely do not need to set it. """ __slots__ = ('hasrun', 'generator', 'env', 'inputs', 'outputs', 'dep_nodes', 'run_after') def __init__(self, *k, **kw): self.hasrun = NOT_RUN try: self.generator = kw['generator'] except KeyError: self.generator = self self.env = kw['env'] """:py:class:`waflib.ConfigSet.ConfigSet` object (make sure to provide one)""" self.inputs = [] """List of input nodes, which represent the files used by the task instance""" self.outputs = [] """List of output nodes, which represent the files created by the task instance""" self.dep_nodes = [] """List of additional nodes to depend on""" self.run_after = set() """Set of tasks that must be executed before this one""" def __lt__(self, other): return self.priority() > other.priority() def __le__(self, other): return self.priority() >= other.priority() def __gt__(self, other): return self.priority() < other.priority() def __ge__(self, other): return self.priority() <= other.priority()
[docs] def get_cwd(self): """ :return: current working directory :rtype: :py:class:`waflib.Node.Node` """ bld = self.generator.bld ret = getattr(self, 'cwd', None) or getattr(bld, 'cwd', bld.bldnode) if isinstance(ret, str): if os.path.isabs(ret): ret = bld.root.make_node(ret) else: ret = self.generator.path.make_node(ret) return ret
[docs] def quote_flag(self, x): """ Surround a process argument by quotes so that a list of arguments can be written to a file :param x: flag :type x: string :return: quoted flag :rtype: string """ old = x if '\\' in x: x = x.replace('\\', '\\\\') if '"' in x: x = x.replace('"', '\\"') if old != x or ' ' in x or '\t' in x or "'" in x: x = '"%s"' % x return x
[docs] def priority(self): """ Priority of execution; the higher, the earlier :return: the priority value :rtype: a tuple of numeric values """ return (self.weight + self.prio_order, - getattr(self.generator, 'tg_idx_count', 0))
[docs] def split_argfile(self, cmd): """ Splits a list of process commands into the executable part and its list of arguments :return: a tuple containing the executable first and then the rest of arguments :rtype: tuple """ return ([cmd[0]], [self.quote_flag(x) for x in cmd[1:]])
[docs] def exec_command(self, cmd, **kw): """ Wrapper for :py:meth:`waflib.Context.Context.exec_command`. This version set the current working directory (``build.variant_dir``), applies PATH settings (if self.env.PATH is provided), and can run long commands through a temporary ``@argfile``. :param cmd: process command to execute :type cmd: list of string (best) or string (process will use a shell) :return: the return code :rtype: int Optional parameters: #. cwd: current working directory (Node or string) #. stdout: set to None to prevent waf from capturing the process standard output #. stderr: set to None to prevent waf from capturing the process standard error #. timeout: timeout value (Python 3) """ if not 'cwd' in kw: kw['cwd'] = self.get_cwd() if hasattr(self, 'timeout'): kw['timeout'] = self.timeout if self.env.PATH: env = kw['env'] = dict(kw.get('env') or self.env.env or os.environ) env['PATH'] = self.env.PATH if isinstance(self.env.PATH, str) else os.pathsep.join(self.env.PATH) if hasattr(self, 'stdout'): kw['stdout'] = self.stdout if hasattr(self, 'stderr'): kw['stderr'] = self.stderr if not isinstance(cmd, str): if Utils.is_win32: # win32 compares the resulting length http://support.microsoft.com/kb/830473 too_long = sum([len(arg) for arg in cmd]) + len(cmd) > 8192 else: # non-win32 counts the amount of arguments (200k) too_long = len(cmd) > 200000 if too_long and getattr(self, 'allow_argsfile', True): # Shunt arguments to a temporary file if the command is too long. cmd, args = self.split_argfile(cmd) try: (fd, tmp) = tempfile.mkstemp() os.write(fd, '\r\n'.join(args).encode()) os.close(fd) if Logs.verbose: Logs.debug('argfile: @%r -> %r', tmp, args) return self.generator.bld.exec_command(cmd + ['@' + tmp], **kw) finally: try: os.remove(tmp) except OSError: # anti-virus and indexers can keep files open -_- pass return self.generator.bld.exec_command(cmd, **kw)
def process(self): """ Runs the task and handles errors :return: 0 or None if everything is fine :rtype: integer """ # remove the task signature immediately before it is executed # so that the task will be executed again in case of failure try: del self.generator.bld.task_sigs[self.uid()] except KeyError: pass try: ret = self.run() except Exception: self.err_msg = traceback.format_exc() self.hasrun = EXCEPTION else: if ret: self.err_code = ret self.hasrun = CRASHED else: try: self.post_run() except Errors.WafError: pass except Exception: self.err_msg = traceback.format_exc() self.hasrun = EXCEPTION else: self.hasrun = SUCCESS if self.hasrun != SUCCESS and self.scan: # rescan dependencies on next run try: del self.generator.bld.imp_sigs[self.uid()] except KeyError: pass
[docs] def log_display(self, bld): "Writes the execution status on the context logger" if self.generator.bld.progress_bar == 3: return s = self.display() if s: if bld.logger: logger = bld.logger else: logger = Logs if self.generator.bld.progress_bar == 1: c1 = Logs.colors.cursor_off c2 = Logs.colors.cursor_on logger.info(s, extra={'stream': sys.stderr, 'terminator':'', 'c1': c1, 'c2' : c2}) else: logger.info(s, extra={'terminator':'', 'c1': '', 'c2' : ''})
[docs] def display(self): """ Returns an execution status for the console, the progress bar, or the IDE output. :rtype: string """ col1 = Logs.colors(self.color) col2 = Logs.colors.NORMAL master = self.generator.bld.producer def cur(): # the current task position, computed as late as possible return master.processed - master.ready.qsize() if self.generator.bld.progress_bar == 1: return self.generator.bld.progress_line(cur(), master.total, col1, col2) if self.generator.bld.progress_bar == 2: ela = str(self.generator.bld.timer) try: ins = ','.join([n.name for n in self.inputs]) except AttributeError: ins = '' try: outs = ','.join([n.name for n in self.outputs]) except AttributeError: outs = '' return '|Total %s|Current %s|Inputs %s|Outputs %s|Time %s|\n' % (master.total, cur(), ins, outs, ela) s = str(self) if not s: return None total = master.total n = len(str(total)) fs = '[%%%dd/%%%dd] %%s%%s%%s%%s\n' % (n, n) kw = self.keyword() if kw: kw += ' ' return fs % (cur(), total, kw, col1, s, col2)
[docs] def hash_constraints(self): """ Identifies a task type for all the constraints relevant for the scheduler: precedence, file production :return: a hash value :rtype: string """ return (tuple(self.before), tuple(self.after), tuple(self.ext_in), tuple(self.ext_out), self.__class__.__name__, self.hcode)
[docs] def format_error(self): """ Returns an error message to display the build failure reasons :rtype: string """ if Logs.verbose: msg = ': %r\n%r' % (self, getattr(self, 'last_cmd', '')) else: msg = ' (run with -v to display more information)' name = getattr(self.generator, 'name', '') if getattr(self, "err_msg", None): return self.err_msg elif not self.hasrun: return 'task in %r was not executed for some reason: %r' % (name, self) elif self.hasrun == CRASHED: try: return ' -> task in %r failed with exit status %r%s' % (name, self.err_code, msg) except AttributeError: return ' -> task in %r failed%s' % (name, msg) elif self.hasrun == MISSING: return ' -> missing files in %r%s' % (name, msg) elif self.hasrun == CANCELED: return ' -> %r canceled because of missing dependencies' % name else: return 'invalid status for task in %r: %r' % (name, self.hasrun)
[docs] def colon(self, var1, var2): """ Enable scriptlet expressions of the form ${FOO_ST:FOO} If the first variable (FOO_ST) is empty, then an empty list is returned The results will be slightly different if FOO_ST is a list, for example:: env.FOO = ['p1', 'p2'] env.FOO_ST = '-I%s' # ${FOO_ST:FOO} returns ['-Ip1', '-Ip2'] env.FOO_ST = ['-a', '-b'] # ${FOO_ST:FOO} returns ['-a', '-b', 'p1', '-a', '-b', 'p2'] """ tmp = self.env[var1] if not tmp: return [] if isinstance(var2, str): it = self.env[var2] else: it = var2 if isinstance(tmp, str): return [tmp % x for x in it] else: lst = [] for y in it: lst.extend(tmp) lst.append(y) return lst
[docs] def __str__(self): "string to display to the user" name = self.__class__.__name__ if self.outputs: if name.endswith(('lib', 'program')) or not self.inputs: node = self.outputs[0] return node.path_from(node.ctx.launch_node()) if not (self.inputs or self.outputs): return self.__class__.__name__ if len(self.inputs) == 1: node = self.inputs[0] return node.path_from(node.ctx.launch_node()) src_str = ' '.join([a.path_from(a.ctx.launch_node()) for a in self.inputs]) tgt_str = ' '.join([a.path_from(a.ctx.launch_node()) for a in self.outputs]) if self.outputs: sep = ' -> ' else: sep = '' return '%s: %s%s%s' % (self.__class__.__name__, src_str, sep, tgt_str)
[docs] def keyword(self): "Display keyword used to prettify the console outputs" name = self.__class__.__name__ if name.endswith(('lib', 'program')): return 'Linking' if len(self.inputs) == 1 and len(self.outputs) == 1: return 'Compiling' if not self.inputs: if self.outputs: return 'Creating' else: return 'Running' return 'Processing'
[docs] def __repr__(self): "for debugging purposes" try: ins = ",".join([x.name for x in self.inputs]) outs = ",".join([x.name for x in self.outputs]) except AttributeError: ins = ",".join([str(x) for x in self.inputs]) outs = ",".join([str(x) for x in self.outputs]) return "".join(['\n\t{task %r: ' % id(self), self.__class__.__name__, " ", ins, " -> ", outs, '}'])
[docs] def uid(self): """ Returns an identifier used to determine if tasks are up-to-date. Since the identifier will be stored between executions, it must be: - unique for a task: no two tasks return the same value (for a given build context) - the same for a given task instance By default, the node paths, the class name, and the function are used as inputs to compute a hash. The pointer to the object (python built-in 'id') will change between build executions, and must be avoided in such hashes. :return: hash value :rtype: string """ try: return self.uid_ except AttributeError: m = Utils.md5(self.__class__.__name__) up = m.update for x in self.inputs + self.outputs: up(x.abspath()) self.uid_ = m.digest() return self.uid_
[docs] def set_inputs(self, inp): """ Appends the nodes to the *inputs* list :param inp: input nodes :type inp: node or list of nodes """ if isinstance(inp, list): self.inputs += inp else: self.inputs.append(inp)
[docs] def set_outputs(self, out): """ Appends the nodes to the *outputs* list :param out: output nodes :type out: node or list of nodes """ if isinstance(out, list): self.outputs += out else: self.outputs.append(out)
[docs] def set_run_after(self, task): """ Run this task only after the given *task*. Calling this method from :py:meth:`waflib.Task.Task.runnable_status` may cause build deadlocks; see :py:meth:`waflib.Tools.fc.fc.runnable_status` for details. :param task: task :type task: :py:class:`waflib.Task.Task` """ assert isinstance(task, Task) self.run_after.add(task)
[docs] def signature(self): """ Task signatures are stored between build executions, they are use to track the changes made to the input nodes (not to the outputs!). The signature hashes data from various sources: * explicit dependencies: files listed in the inputs (list of node objects) :py:meth:`waflib.Task.Task.sig_explicit_deps` * implicit dependencies: list of nodes returned by scanner methods (when present) :py:meth:`waflib.Task.Task.sig_implicit_deps` * hashed data: variables/values read from task.vars/task.env :py:meth:`waflib.Task.Task.sig_vars` If the signature is expected to give a different result, clear the cache kept in ``self.cache_sig``:: from waflib import Task class cls(Task.Task): def signature(self): sig = super(Task.Task, self).signature() delattr(self, 'cache_sig') return super(Task.Task, self).signature() :return: the signature value :rtype: string or bytes """ try: return self.cache_sig except AttributeError: pass self.m = Utils.md5(self.hcode) # explicit deps self.sig_explicit_deps() # env vars self.sig_vars() # implicit deps / scanner results if self.scan: try: self.sig_implicit_deps() except Errors.TaskRescan: return self.signature() ret = self.cache_sig = self.m.digest() return ret
[docs] def runnable_status(self): """ Returns the Task status :return: a task state in :py:const:`waflib.Task.RUN_ME`, :py:const:`waflib.Task.SKIP_ME`, :py:const:`waflib.Task.CANCEL_ME` or :py:const:`waflib.Task.ASK_LATER`. :rtype: int """ bld = self.generator.bld if bld.is_install < 0: return SKIP_ME for t in self.run_after: if not t.hasrun: return ASK_LATER elif t.hasrun < SKIPPED: # a dependency has an error return CANCEL_ME # first compute the signature try: new_sig = self.signature() except Errors.TaskNotReady: return ASK_LATER # compare the signature to a signature computed previously key = self.uid() try: prev_sig = bld.task_sigs[key] except KeyError: Logs.debug('task: task %r must run: it was never run before or the task code changed', self) return RUN_ME if new_sig != prev_sig: Logs.debug('task: task %r must run: the task signature changed', self) return RUN_ME # compare the signatures of the outputs for node in self.outputs: sig = bld.node_sigs.get(node) if not sig: Logs.debug('task: task %r must run: an output node has no signature', self) return RUN_ME if sig != key: Logs.debug('task: task %r must run: an output node was produced by another task', self) return RUN_ME if not node.exists(): Logs.debug('task: task %r must run: an output node does not exist', self) return RUN_ME return (self.always_run and RUN_ME) or SKIP_ME
[docs] def post_run(self): """ Called after successful execution to record that the task has run by updating the entry in :py:attr:`waflib.Build.BuildContext.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) bld.node_sigs[node] = self.uid() # make sure this task produced the files in question bld.task_sigs[self.uid()] = self.signature() if not self.keep_last_cmd: try: del self.last_cmd except AttributeError: pass
[docs] def sig_explicit_deps(self): """ Used by :py:meth:`waflib.Task.Task.signature`; it hashes :py:attr:`waflib.Task.Task.inputs` and :py:attr:`waflib.Task.Task.dep_nodes` signatures. """ bld = self.generator.bld upd = self.m.update # the inputs for x in self.inputs + self.dep_nodes: upd(x.get_bld_sig()) # manual dependencies, they can slow down the builds if bld.deps_man: additional_deps = bld.deps_man for x in self.inputs + self.outputs: try: d = additional_deps[x] except KeyError: continue for v in d: try: v = v.get_bld_sig() except AttributeError: if hasattr(v, '__call__'): v = v() # dependency is a function, call it upd(v)
[docs] def sig_deep_inputs(self): """ Enable rebuilds on input files task signatures. Not used by default. Example: hashes of output programs can be unchanged after being re-linked, despite the libraries being different. This method can thus prevent stale unit test results (waf_unit_test.py). Hashing input file timestamps is another possibility for the implementation. This may cause unnecessary rebuilds when input tasks are frequently executed. Here is an implementation example:: lst = [] for node in self.inputs + self.dep_nodes: st = os.stat(node.abspath()) lst.append(st.st_mtime) lst.append(st.st_size) self.m.update(Utils.h_list(lst)) The downside of the implementation is that it absolutely requires all build directory files to be declared within the current build. """ bld = self.generator.bld lst = [bld.task_sigs[bld.node_sigs[node]] for node in (self.inputs + self.dep_nodes) if node.is_bld()] self.m.update(Utils.h_list(lst))
[docs] def sig_vars(self): """ Used by :py:meth:`waflib.Task.Task.signature`; it hashes :py:attr:`waflib.Task.Task.env` variables/values When overriding this method, and if scriptlet expressions are used, make sure to follow the code in :py:meth:`waflib.Task.Task.compile_sig_vars` to enable dependencies on scriptlet results. This method may be replaced on subclasses by the metaclass to force dependencies on scriptlet code. """ sig = self.generator.bld.hash_env_vars(self.env, self.vars) self.m.update(sig)
scan = None """ This method, when provided, returns a tuple containing: * a list of nodes corresponding to real files * a list of names for files not found in path_lst For example:: from waflib.Task import Task class mytask(Task): def scan(self, node): return ([], []) The first and second lists in the tuple are stored in :py:attr:`waflib.Build.BuildContext.node_deps` and :py:attr:`waflib.Build.BuildContext.raw_deps` respectively. """
[docs] def sig_implicit_deps(self): """ Used by :py:meth:`waflib.Task.Task.signature`; it hashes node signatures obtained by scanning for dependencies (:py:meth:`waflib.Task.Task.scan`). The exception :py:class:`waflib.Errors.TaskRescan` is thrown when a file has changed. In this case, the method :py:meth:`waflib.Task.Task.signature` is called once again, and return here to call :py:meth:`waflib.Task.Task.scan` and searching for dependencies. """ bld = self.generator.bld # get the task signatures from previous runs key = self.uid() prev = bld.imp_sigs.get(key, []) # for issue #379 if prev: try: if prev == self.compute_sig_implicit_deps(): return prev except Errors.TaskNotReady: raise except EnvironmentError: # when a file was renamed, remove the stale nodes (headers in folders without source files) # this will break the order calculation for headers created during the build in the source directory (should be uncommon) # the behaviour will differ when top != out for x in bld.node_deps.get(self.uid(), []): if not x.is_bld() and not x.exists(): try: del x.parent.children[x.name] except KeyError: pass del bld.imp_sigs[key] raise Errors.TaskRescan('rescan') # no previous run or the signature of the dependencies has changed, rescan the dependencies (bld.node_deps[key], bld.raw_deps[key]) = self.scan() if Logs.verbose: Logs.debug('deps: scanner for %s: %r; unresolved: %r', self, bld.node_deps[key], bld.raw_deps[key]) # recompute the signature and return it try: bld.imp_sigs[key] = self.compute_sig_implicit_deps() except EnvironmentError: for k in bld.node_deps.get(self.uid(), []): if not k.exists(): Logs.warn('Dependency %r for %r is missing: check the task declaration and the build order!', k, self) raise
[docs] def compute_sig_implicit_deps(self): """ Used by :py:meth:`waflib.Task.Task.sig_implicit_deps` for computing the actual hash of the :py:class:`waflib.Node.Node` returned by the scanner. :return: a hash value for the implicit dependencies :rtype: string or bytes """ upd = self.m.update self.are_implicit_nodes_ready() # scanner returns a node that does not have a signature # just *ignore* the error and let them figure out from the compiler output # waf -k behaviour for k in self.generator.bld.node_deps.get(self.uid(), []): upd(k.get_bld_sig()) return self.m.digest()
[docs] def are_implicit_nodes_ready(self): """ For each node returned by the scanner, see if there is a task that creates it, and infer the build order This has a low performance impact on null builds (1.86s->1.66s) thanks to caching (28s->1.86s) """ bld = self.generator.bld try: cache = bld.dct_implicit_nodes except AttributeError: bld.dct_implicit_nodes = cache = {} # one cache per build group try: dct = cache[bld.current_group] except KeyError: dct = cache[bld.current_group] = {} for tsk in bld.cur_tasks: for x in tsk.outputs: dct[x] = tsk modified = False for x in bld.node_deps.get(self.uid(), []): if x in dct: self.run_after.add(dct[x]) modified = True if modified: for tsk in self.run_after: if not tsk.hasrun: #print "task is not ready..." raise Errors.TaskNotReady('not ready')
if sys.hexversion > 0x3000000:
[docs] def uid(self): try: return self.uid_ except AttributeError: m = Utils.md5(self.__class__.__name__.encode('latin-1', 'xmlcharrefreplace')) up = m.update for x in self.inputs + self.outputs: up(x.abspath().encode('latin-1', 'xmlcharrefreplace')) self.uid_ = m.digest() return self.uid_
uid.__doc__ = Task.uid.__doc__ Task.uid = uid
[docs]def is_before(t1, t2): """ Returns a non-zero value if task t1 is to be executed before task t2:: t1.ext_out = '.h' t2.ext_in = '.h' t2.after = ['t1'] t1.before = ['t2'] waflib.Task.is_before(t1, t2) # True :param t1: Task object :type t1: :py:class:`waflib.Task.Task` :param t2: Task object :type t2: :py:class:`waflib.Task.Task` """ to_list = Utils.to_list for k in to_list(t2.ext_in): if k in to_list(t1.ext_out): return 1 if t1.__class__.__name__ in to_list(t2.after): return 1 if t2.__class__.__name__ in to_list(t1.before): return 1 return 0
[docs]def set_file_constraints(tasks): """ Updates the ``run_after`` attribute of all tasks based on the task inputs and outputs :param tasks: tasks :type tasks: list of :py:class:`waflib.Task.Task` """ ins = Utils.defaultdict(set) outs = Utils.defaultdict(set) for x in tasks: for a in x.inputs: ins[a].add(x) for a in x.dep_nodes: ins[a].add(x) for a in x.outputs: outs[a].add(x) links = set(ins.keys()).intersection(outs.keys()) for k in links: for a in ins[k]: a.run_after.update(outs[k])
[docs]class TaskGroup(object): """ Wrap nxm task order constraints into a single object to prevent the creation of large list/set objects This is an optimization """ def __init__(self, prev, next): self.prev = prev self.next = next self.done = False def get_hasrun(self): for k in self.prev: if not k.hasrun: return NOT_RUN return SUCCESS hasrun = property(get_hasrun, None)
[docs]def set_precedence_constraints(tasks): """ Updates the ``run_after`` attribute of all tasks based on the after/before/ext_out/ext_in attributes :param tasks: tasks :type tasks: list of :py:class:`waflib.Task.Task` """ cstr_groups = Utils.defaultdict(list) for x in tasks: h = x.hash_constraints() cstr_groups[h].append(x) keys = list(cstr_groups.keys()) maxi = len(keys) # this list should be short for i in range(maxi): t1 = cstr_groups[keys[i]][0] for j in range(i + 1, maxi): t2 = cstr_groups[keys[j]][0] # add the constraints based on the comparisons if is_before(t1, t2): a = i b = j elif is_before(t2, t1): a = j b = i else: continue a = cstr_groups[keys[a]] b = cstr_groups[keys[b]] if len(a) < 2 or len(b) < 2: for x in b: x.run_after.update(a) else: group = TaskGroup(set(a), set(b)) for x in b: x.run_after.add(group)
[docs]def funex(c): """ Compiles a scriptlet expression into a Python function :param c: function to compile :type c: string :return: the function 'f' declared in the input string :rtype: function """ dc = {} exec(c, dc) return dc['f']
re_cond = re.compile(r'(?P<var>\w+)|(?P<or>\|)|(?P<and>&)') re_novar = re.compile(r'^(SRC|TGT)\W+.*?$') reg_act = re.compile(r'(?P<backslash>\\)|(?P<dollar>\$\$)|(?P<subst>\$\{(?P<var>\w+)(?P<code>.*?)\})', re.M)
[docs]def compile_fun_shell(line): """ Creates a compiled function to execute a process through a sub-shell """ extr = [] def repl(match): g = match.group if g('dollar'): return "$" elif g('backslash'): return '\\\\' elif g('subst'): extr.append((g('var'), g('code'))) return "%s" return None line = reg_act.sub(repl, line) or line dvars = [] def add_dvar(x): if x not in dvars: dvars.append(x) def replc(m): # performs substitutions and populates dvars if m.group('and'): return ' and ' elif m.group('or'): return ' or ' else: x = m.group('var') add_dvar(x) return 'env[%r]' % x parm = [] app = parm.append for (var, meth) in extr: if var == 'SRC': if meth: app('tsk.inputs%s' % meth) else: app('" ".join([a.path_from(cwdx) for a in tsk.inputs])') elif var == 'TGT': if meth: app('tsk.outputs%s' % meth) else: app('" ".join([a.path_from(cwdx) for a in tsk.outputs])') elif meth: if meth.startswith(':'): add_dvar(var) m = meth[1:] if m == 'SRC': m = '[a.path_from(cwdx) for a in tsk.inputs]' elif m == 'TGT': m = '[a.path_from(cwdx) for a in tsk.outputs]' elif re_novar.match(m): m = '[tsk.inputs%s]' % m[3:] elif re_novar.match(m): m = '[tsk.outputs%s]' % m[3:] else: add_dvar(m) if m[:3] not in ('tsk', 'gen', 'bld'): m = '%r' % m app('" ".join(tsk.colon(%r, %s))' % (var, m)) elif meth.startswith('?'): # In A?B|C output env.A if one of env.B or env.C is non-empty expr = re_cond.sub(replc, meth[1:]) app('p(%r) if (%s) else ""' % (var, expr)) else: call = '%s%s' % (var, meth) add_dvar(call) app(call) else: add_dvar(var) app("p('%s')" % var) if parm: parm = "%% (%s) " % (',\n\t\t'.join(parm)) else: parm = '' c = COMPILE_TEMPLATE_SHELL % (line, parm) Logs.debug('action: %s', c.strip().splitlines()) return (funex(c), dvars)
reg_act_noshell = re.compile(r"(?P<space>\s+)|(?P<subst>\$\{(?P<var>\w+)(?P<code>.*?)\})|(?P<text>([^$ \t\n\r\f\v]|\$\$)+)", re.M)
[docs]def compile_fun_noshell(line): """ Creates a compiled function to execute a process without a sub-shell """ buf = [] dvars = [] merge = False app = buf.append def add_dvar(x): if x not in dvars: dvars.append(x) def replc(m): # performs substitutions and populates dvars if m.group('and'): return ' and ' elif m.group('or'): return ' or ' else: x = m.group('var') add_dvar(x) return 'env[%r]' % x for m in reg_act_noshell.finditer(line): if m.group('space'): merge = False continue elif m.group('text'): app('[%r]' % m.group('text').replace('$$', '$')) elif m.group('subst'): var = m.group('var') code = m.group('code') if var == 'SRC': if code: app('[tsk.inputs%s]' % code) else: app('[a.path_from(cwdx) for a in tsk.inputs]') elif var == 'TGT': if code: app('[tsk.outputs%s]' % code) else: app('[a.path_from(cwdx) for a in tsk.outputs]') elif code: if code.startswith(':'): # a composed variable ${FOO:OUT} add_dvar(var) m = code[1:] if m == 'SRC': m = '[a.path_from(cwdx) for a in tsk.inputs]' elif m == 'TGT': m = '[a.path_from(cwdx) for a in tsk.outputs]' elif re_novar.match(m): m = '[tsk.inputs%s]' % m[3:] elif re_novar.match(m): m = '[tsk.outputs%s]' % m[3:] else: add_dvar(m) if m[:3] not in ('tsk', 'gen', 'bld'): m = '%r' % m app('tsk.colon(%r, %s)' % (var, m)) elif code.startswith('?'): # In A?B|C output env.A if one of env.B or env.C is non-empty expr = re_cond.sub(replc, code[1:]) app('to_list(env[%r] if (%s) else [])' % (var, expr)) else: # plain code such as ${tsk.inputs[0].abspath()} call = '%s%s' % (var, code) add_dvar(call) app('to_list(%s)' % call) else: # a plain variable such as # a plain variable like ${AR} app('to_list(env[%r])' % var) add_dvar(var) if merge: tmp = 'merge(%s, %s)' % (buf[-2], buf[-1]) del buf[-1] buf[-1] = tmp merge = True # next turn buf = ['lst.extend(%s)' % x for x in buf] fun = COMPILE_TEMPLATE_NOSHELL % "\n\t".join(buf) Logs.debug('action: %s', fun.strip().splitlines()) return (funex(fun), dvars)
[docs]def compile_fun(line, shell=False): """ Parses a string expression such as '${CC} ${SRC} -o ${TGT}' and returns a pair containing: * The function created (compiled) for use as :py:meth:`waflib.Task.Task.run` * The list of variables that must cause rebuilds when *env* data is modified for example:: from waflib.Task import compile_fun compile_fun('cxx', '${CXX} -o ${TGT[0]} ${SRC} -I ${SRC[0].parent.bldpath()}') def build(bld): bld(source='wscript', rule='echo "foo\\${SRC[0].name}\\bar"') The env variables (CXX, ..) on the task must not hold dicts so as to preserve a consistent order. The reserved keywords ``TGT`` and ``SRC`` represent the task input and output nodes """ if isinstance(line, str): if line.find('<') > 0 or line.find('>') > 0 or line.find('&&') > 0: shell = True else: dvars_lst = [] funs_lst = [] for x in line: if isinstance(x, str): fun, dvars = compile_fun(x, shell) dvars_lst += dvars funs_lst.append(fun) else: # assume a function to let through funs_lst.append(x) def composed_fun(task): for x in funs_lst: ret = x(task) if ret: return ret return None return composed_fun, dvars_lst if shell: return compile_fun_shell(line) else: return compile_fun_noshell(line)
[docs]def compile_sig_vars(vars): """ This method produces a sig_vars method suitable for subclasses that provide scriptlet code in their run_str code. If no such method can be created, this method returns None. The purpose of the sig_vars method returned is to ensures that rebuilds occur whenever the contents of the expression changes. This is the case B below:: import time # case A: regular variables tg = bld(rule='echo ${FOO}') tg.env.FOO = '%s' % time.time() # case B bld(rule='echo ${gen.foo}', foo='%s' % time.time()) :param vars: env variables such as CXXFLAGS or gen.foo :type vars: list of string :return: A sig_vars method relevant for dependencies if adequate, else None :rtype: A function, or None in most cases """ buf = [] for x in sorted(vars): if x[:3] in ('tsk', 'gen', 'bld'): buf.append('buf.append(%s)' % x) if buf: return funex(COMPILE_TEMPLATE_SIG_VARS % '\n\t'.join(buf)) return None
[docs]def task_factory(name, func=None, vars=None, color='GREEN', ext_in=[], ext_out=[], before=[], after=[], shell=False, scan=None): """ Returns a new task subclass with the function ``run`` compiled from the line given. :param func: method run :type func: string or function :param vars: list of variables to hash :type vars: list of string :param color: color to use :type color: string :param shell: when *func* is a string, enable/disable the use of the shell :type shell: bool :param scan: method scan :type scan: function :rtype: :py:class:`waflib.Task.Task` """ params = { 'vars': vars or [], # function arguments are static, and this one may be modified by the class 'color': color, 'name': name, 'shell': shell, 'scan': scan, } if isinstance(func, str) or isinstance(func, tuple): params['run_str'] = func else: params['run'] = func cls = type(Task)(name, (Task,), params) classes[name] = cls if ext_in: cls.ext_in = Utils.to_list(ext_in) if ext_out: cls.ext_out = Utils.to_list(ext_out) if before: cls.before = Utils.to_list(before) if after: cls.after = Utils.to_list(after) return cls
[docs]def deep_inputs(cls): """ Task class decorator to enable rebuilds on input files task signatures """ def sig_explicit_deps(self): Task.sig_explicit_deps(self) Task.sig_deep_inputs(self) cls.sig_explicit_deps = sig_explicit_deps return cls
TaskBase = Task "Provided for compatibility reasons, TaskBase should not be used"
[docs]class TaskSemaphore(object): """ Task semaphores provide a simple and efficient way of throttling the amount of a particular task to run concurrently. The throttling value is capped by the amount of maximum jobs, so for example, a `TaskSemaphore(10)` has no effect in a `-j2` build. Task semaphores are typically specified on the task class level:: class compile(waflib.Task.Task): semaphore = waflib.Task.TaskSemaphore(2) run_str = 'touch ${TGT}' Task semaphores are meant to be used by the build scheduler in the main thread, so there are no guarantees of thread safety. """
[docs] def __init__(self, num): """ :param num: maximum value of concurrent tasks :type num: int """ self.num = num self.locking = set() self.waiting = set()
[docs] def is_locked(self): """Returns True if this semaphore cannot be acquired by more tasks""" return len(self.locking) >= self.num
[docs] def acquire(self, tsk): """ Mark the semaphore as used by the given task (not re-entrant). :param tsk: task object :type tsk: :py:class:`waflib.Task.Task` :raises: :py:class:`IndexError` in case the resource is already acquired """ if self.is_locked(): raise IndexError('Cannot lock more %r' % self.locking) self.locking.add(tsk)
[docs] def release(self, tsk): """ Mark the semaphore as unused by the given task. :param tsk: task object :type tsk: :py:class:`waflib.Task.Task` :raises: :py:class:`KeyError` in case the resource is not acquired by the task """ self.locking.remove(tsk)