Mercurial > hg-stable
view tests/test-hgignore.t @ 26457:7e81305092a0
demandimport: replace more references to _demandmod instances
_demandmod instances may be referenced by multiple importing modules.
Before this patch, the _demandmod instance only maintained a reference
to its first consumer when using the "from X import Y" syntax. This is
because we only created a single _demandmod instance (attached to the
parent X module). If multiple modules A and B performed
"from X import Y", we'd produce a single _demandmod instance
"demandmod" with the following references:
X.Y = <demandmod>
A.Y = <demandmod>
B.Y = <demandmod>
The locals from the first consumer (A) would be stored in <demandmod1>.
When <demandmod1> was loaded, we'd look at the locals for the first
consumer and replace the symbol, if necessary. This resulted in state:
X.Y = <module>
A.Y = <module>
B.Y = <demandmod>
B's reference to Y wasn't updated and was still using the proxy object
because we just didn't record that B had a reference to <demandmod> that
needed updating!
With this patch, we add support for tracking which modules in addition
to the initial importer have a reference to the _demandmod instance and
we replace those references at module load time.
In the case of posix.py, this fixes an issue where the "encoding" module
was being proxied, resulting in hundreds of thousands of
__getattribute__ lookups on the _demandmod instance during dirstate
operations on mozilla-central, speeding up execution by many
milliseconds. There are likely several other operation that benefit from
this change as well.
The new mechanism isn't perfect: references in locals (not globals) may
likely linger. So, if there is an import inside a function and a symbol
from that module is used in a hot loop, we could have unwanted overhead
from proxying through _demandmod. Non-global imports are discouraged
anyway. So hopefully this isn't a big deal in practice. We could
potentially deploy a code checker that bans use of attribute lookups of
function-level-imported modules inside loops.
This deficiency in theory could be avoided by storing the set of globals
and locals dicts to update in the _demandmod instance. However, I tried
this and it didn't work. One reason is that some globals are _demandmod
instances. We could work around this, but it's a bit more work. There
also might be other module import foo at play. The solution as
implemented is better than what we had and IMO is good enough for the
time being.
It's worth noting that this sub-optimal behavior was made worse by the
introduction of absolute_import and its recommended "from . import X"
syntax for importing modules from the "mercurial" package. If we ever
wrote performance tests, measuring the amount of module imports and
__getattribute__ proxy calls through _demandmod instances would be
something I'd have it check.
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Sun, 04 Oct 2015 11:17:43 -0700 |
parents | 3de48ff62733 |
children | ee2d7b5daa8a |
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$ hg init ignorerepo $ cd ignorerepo Issue562: .hgignore requires newline at end: $ touch foo $ touch bar $ touch baz $ cat > makeignore.py <<EOF > f = open(".hgignore", "w") > f.write("ignore\n") > f.write("foo\n") > # No EOL here > f.write("bar") > f.close() > EOF $ python makeignore.py Should display baz only: $ hg status ? baz $ rm foo bar baz .hgignore makeignore.py $ touch a.o $ touch a.c $ touch syntax $ mkdir dir $ touch dir/a.o $ touch dir/b.o $ touch dir/c.o $ hg add dir/a.o $ hg commit -m 0 $ hg add dir/b.o $ hg status A dir/b.o ? a.c ? a.o ? dir/c.o ? syntax $ echo "*.o" > .hgignore $ hg status abort: $TESTTMP/ignorerepo/.hgignore: invalid pattern (relre): *.o (glob) [255] $ echo ".*\.o" > .hgignore $ hg status A dir/b.o ? .hgignore ? a.c ? syntax Check it does not ignore the current directory '.': $ echo "^\." > .hgignore $ hg status A dir/b.o ? a.c ? a.o ? dir/c.o ? syntax Test that patterns from ui.ignore options are read: $ echo > .hgignore $ cat >> $HGRCPATH << EOF > [ui] > ignore.other = $TESTTMP/ignorerepo/.hg/testhgignore > EOF $ echo "glob:**.o" > .hg/testhgignore $ hg status A dir/b.o ? .hgignore ? a.c ? syntax empty out testhgignore $ echo > .hg/testhgignore Test relative ignore path (issue4473): $ cat >> $HGRCPATH << EOF > [ui] > ignore.relative = .hg/testhgignorerel > EOF $ echo "glob:*.o" > .hg/testhgignorerel $ cd dir $ hg status A dir/b.o ? .hgignore ? a.c ? syntax $ cd .. $ echo > .hg/testhgignorerel $ echo "syntax: glob" > .hgignore $ echo "re:.*\.o" >> .hgignore $ hg status A dir/b.o ? .hgignore ? a.c ? syntax $ echo "syntax: invalid" > .hgignore $ hg status $TESTTMP/ignorerepo/.hgignore: ignoring invalid syntax 'invalid' (glob) A dir/b.o ? .hgignore ? a.c ? a.o ? dir/c.o ? syntax $ echo "syntax: glob" > .hgignore $ echo "*.o" >> .hgignore $ hg status A dir/b.o ? .hgignore ? a.c ? syntax $ echo "relglob:syntax*" > .hgignore $ hg status A dir/b.o ? .hgignore ? a.c ? a.o ? dir/c.o $ echo "relglob:*" > .hgignore $ hg status A dir/b.o $ cd dir $ hg status . A b.o $ hg debugignore (?:(?:|.*/)[^/]*(?:/|$)) $ cd .. Check patterns that match only the directory $ echo "^dir\$" > .hgignore $ hg status A dir/b.o ? .hgignore ? a.c ? a.o ? syntax Check recursive glob pattern matches no directories (dir/**/c.o matches dir/c.o) $ echo "syntax: glob" > .hgignore $ echo "dir/**/c.o" >> .hgignore $ touch dir/c.o $ mkdir dir/subdir $ touch dir/subdir/c.o $ hg status A dir/b.o ? .hgignore ? a.c ? a.o ? syntax Check using 'include:' in ignore file $ hg purge --all --config extensions.purge= $ touch foo.included $ echo ".*.included" > otherignore $ hg status -I "include:otherignore" ? foo.included $ echo "include:otherignore" >> .hgignore $ hg status A dir/b.o ? .hgignore ? otherignore Check recursive uses of 'include:' $ echo "include:nested/ignore" >> otherignore $ mkdir nested $ echo "glob:*ignore" > nested/ignore $ hg status A dir/b.o $ cp otherignore goodignore $ echo "include:badignore" >> otherignore $ hg status skipping unreadable pattern file 'badignore': No such file or directory A dir/b.o $ mv goodignore otherignore Check using 'include:' while in a non-root directory $ cd .. $ hg -R ignorerepo status A dir/b.o $ cd ignorerepo Check including subincludes $ hg revert -q --all $ hg purge --all --config extensions.purge= $ echo ".hgignore" > .hgignore $ mkdir dir1 dir2 $ touch dir1/file1 dir1/file2 dir2/file1 dir2/file2 $ echo "subinclude:dir2/.hgignore" >> .hgignore $ echo "glob:file*2" > dir2/.hgignore $ hg status ? dir1/file1 ? dir1/file2 ? dir2/file1 Check including subincludes with regexs $ echo "subinclude:dir1/.hgignore" >> .hgignore $ echo "regexp:f.le1" > dir1/.hgignore $ hg status ? dir1/file2 ? dir2/file1 Check multiple levels of sub-ignores $ mkdir dir1/subdir $ touch dir1/subdir/subfile1 dir1/subdir/subfile3 dir1/subdir/subfile4 $ echo "subinclude:subdir/.hgignore" >> dir1/.hgignore $ echo "glob:subfil*3" >> dir1/subdir/.hgignore $ hg status ? dir1/file2 ? dir1/subdir/subfile4 ? dir2/file1 Check include subignore at the same level $ mv dir1/subdir/.hgignore dir1/.hgignoretwo $ echo "regexp:f.le1" > dir1/.hgignore $ echo "subinclude:.hgignoretwo" >> dir1/.hgignore $ echo "glob:file*2" > dir1/.hgignoretwo $ hg status | grep file2 [1]