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Diffstat (limited to 'waflib/Task.py')
| -rw-r--r-- | waflib/Task.py | 1406 |
1 files changed, 1406 insertions, 0 deletions
diff --git a/waflib/Task.py b/waflib/Task.py new file mode 100644 index 0000000..cb49a73 --- /dev/null +++ b/waflib/Task.py @@ -0,0 +1,1406 @@ +#!/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. +""" + +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" + +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() + + 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 + + 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 + + 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)) + + 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:]]) + + 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 + + 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' : ''}) + + 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) + + 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) + + 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) + + 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 + + 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) + + 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' + + 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, '}']) + + 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_ + + 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) + + 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) + + 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) + + 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 + + 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 + + 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 + + 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) + + 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)) + + 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. + """ + + 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 + + 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() + + 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: + 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 + +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 + +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]) + + +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) + +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) + +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) +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) +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 ${AR} + app('to_list(env[%r])' % var) + add_dvar(var) + if merge: + tmp = 'merge(%s, %s)' % (buf[-2], buf[-1]) + del buf[-1] + buf[-1] = tmp + merge = True # next turn + + buf = ['lst.extend(%s)' % x for x in buf] + fun = COMPILE_TEMPLATE_NOSHELL % "\n\t".join(buf) + Logs.debug('action: %s', fun.strip().splitlines()) + return (funex(fun), dvars) + +def compile_fun(line, shell=False): + """ + Parses a string expression such as '${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) + +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 + +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 + +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" + +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. + """ + def __init__(self, num): + """ + :param num: maximum value of concurrent tasks + :type num: int + """ + self.num = num + self.locking = set() + self.waiting = set() + + def is_locked(self): + """Returns True if this semaphore cannot be acquired by more tasks""" + return len(self.locking) >= self.num + + 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) + + 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) + |