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author | David Robillard <d@drobilla.net> | 2018-09-15 14:51:03 +0200 |
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committer | David Robillard <d@drobilla.net> | 2018-09-15 14:51:03 +0200 |
commit | c2b0355b0de23f6ec83b5fa5be038bcce208e26f (patch) | |
tree | ff0760d5f3f0e994413c8c1dff7a4fed37914bee /extras/why.py | |
download | serd-c2b0355b0de23f6ec83b5fa5be038bcce208e26f.tar.gz serd-c2b0355b0de23f6ec83b5fa5be038bcce208e26f.tar.bz2 serd-c2b0355b0de23f6ec83b5fa5be038bcce208e26f.zip |
Squashed 'waflib/' content from commit 982416b
git-subtree-dir: waflib
git-subtree-split: 982416b8a6c6728e200243e1be3ab60435c08830
Diffstat (limited to 'extras/why.py')
-rw-r--r-- | extras/why.py | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/extras/why.py b/extras/why.py new file mode 100644 index 00000000..1bb941f6 --- /dev/null +++ b/extras/why.py @@ -0,0 +1,78 @@ +#! /usr/bin/env python +# encoding: utf-8 +# Thomas Nagy, 2010 (ita) + +""" +This tool modifies the task signature scheme to store and obtain +information about the task execution (why it must run, etc):: + + def configure(conf): + conf.load('why') + +After adding the tool, a full rebuild is necessary: +waf clean build --zones=task +""" + +from waflib import Task, Utils, Logs, Errors + +def signature(self): + # compute the result one time, and suppose the scan_signature will give the good result + try: + return self.cache_sig + except AttributeError: + pass + + self.m = Utils.md5() + self.m.update(self.hcode) + id_sig = self.m.digest() + + # explicit deps + self.m = Utils.md5() + self.sig_explicit_deps() + exp_sig = self.m.digest() + + # env vars + self.m = Utils.md5() + self.sig_vars() + var_sig = self.m.digest() + + # implicit deps / scanner results + self.m = Utils.md5() + if self.scan: + try: + self.sig_implicit_deps() + except Errors.TaskRescan: + return self.signature() + impl_sig = self.m.digest() + + ret = self.cache_sig = impl_sig + id_sig + exp_sig + var_sig + return ret + + +Task.Task.signature = signature + +old = Task.Task.runnable_status +def runnable_status(self): + ret = old(self) + if ret == Task.RUN_ME: + try: + old_sigs = self.generator.bld.task_sigs[self.uid()] + except (KeyError, AttributeError): + Logs.debug("task: task must run as no previous signature exists") + else: + new_sigs = self.cache_sig + def v(x): + return Utils.to_hex(x) + + Logs.debug('Task %r', self) + msgs = ['* Implicit or scanner dependency', '* Task code', '* Source file, explicit or manual dependency', '* Configuration data variable'] + tmp = 'task: -> %s: %s %s' + for x in range(len(msgs)): + l = len(Utils.SIG_NIL) + a = new_sigs[x*l : (x+1)*l] + b = old_sigs[x*l : (x+1)*l] + if (a != b): + Logs.debug(tmp, msgs[x].ljust(35), v(a), v(b)) + return ret +Task.Task.runnable_status = runnable_status + |