view tests/test-git-export.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.

  $ hg init
  $ echo start > start
  $ hg ci -Amstart
  adding start

New file:

  $ mkdir dir1
  $ echo new > dir1/new
  $ hg ci -Amnew
  adding dir1/new
  $ hg diff --git -r 0
  diff --git a/dir1/new b/dir1/new
  new file mode 100644
  --- /dev/null
  +++ b/dir1/new
  @@ -0,0 +1,1 @@
  +new

Copy:

  $ mkdir dir2
  $ hg cp dir1/new dir1/copy
  $ echo copy1 >> dir1/copy
  $ hg cp dir1/new dir2/copy
  $ echo copy2 >> dir2/copy
  $ hg ci -mcopy
  $ hg diff --git -r 1:tip
  diff --git a/dir1/new b/dir1/copy
  copy from dir1/new
  copy to dir1/copy
  --- a/dir1/new
  +++ b/dir1/copy
  @@ -1,1 +1,2 @@
   new
  +copy1
  diff --git a/dir1/new b/dir2/copy
  copy from dir1/new
  copy to dir2/copy
  --- a/dir1/new
  +++ b/dir2/copy
  @@ -1,1 +1,2 @@
   new
  +copy2

Cross and same-directory copies with a relative root:

  $ hg diff --git --root .. -r 1:tip
  abort: .. not under root '$TESTTMP'
  [255]
  $ hg diff --git --root doesnotexist -r 1:tip
  $ hg diff --git --root . -r 1:tip
  diff --git a/dir1/new b/dir1/copy
  copy from dir1/new
  copy to dir1/copy
  --- a/dir1/new
  +++ b/dir1/copy
  @@ -1,1 +1,2 @@
   new
  +copy1
  diff --git a/dir1/new b/dir2/copy
  copy from dir1/new
  copy to dir2/copy
  --- a/dir1/new
  +++ b/dir2/copy
  @@ -1,1 +1,2 @@
   new
  +copy2
  $ hg diff --git --root dir1 -r 1:tip
  diff --git a/new b/copy
  copy from new
  copy to copy
  --- a/new
  +++ b/copy
  @@ -1,1 +1,2 @@
   new
  +copy1

  $ hg diff --git --root dir2/ -r 1:tip
  diff --git a/copy b/copy
  new file mode 100644
  --- /dev/null
  +++ b/copy
  @@ -0,0 +1,2 @@
  +new
  +copy2

  $ hg diff --git --root dir1 -r 1:tip -I '**/copy'
  diff --git a/new b/copy
  copy from new
  copy to copy
  --- a/new
  +++ b/copy
  @@ -1,1 +1,2 @@
   new
  +copy1

  $ hg diff --git --root dir1 -r 1:tip dir2
  warning: dir2 not inside relative root dir1

  $ hg diff --git --root dir1 -r 1:tip 'dir2/{copy}'
  warning: dir2/{copy} not inside relative root dir1 (glob)

  $ cd dir1
  $ hg diff --git --root .. -r 1:tip
  diff --git a/dir1/new b/dir1/copy
  copy from dir1/new
  copy to dir1/copy
  --- a/dir1/new
  +++ b/dir1/copy
  @@ -1,1 +1,2 @@
   new
  +copy1
  diff --git a/dir1/new b/dir2/copy
  copy from dir1/new
  copy to dir2/copy
  --- a/dir1/new
  +++ b/dir2/copy
  @@ -1,1 +1,2 @@
   new
  +copy2

  $ hg diff --git --root ../.. -r 1:tip
  abort: ../.. not under root '$TESTTMP'
  [255]
  $ hg diff --git --root ../doesnotexist -r 1:tip
  $ hg diff --git --root .. -r 1:tip
  diff --git a/dir1/new b/dir1/copy
  copy from dir1/new
  copy to dir1/copy
  --- a/dir1/new
  +++ b/dir1/copy
  @@ -1,1 +1,2 @@
   new
  +copy1
  diff --git a/dir1/new b/dir2/copy
  copy from dir1/new
  copy to dir2/copy
  --- a/dir1/new
  +++ b/dir2/copy
  @@ -1,1 +1,2 @@
   new
  +copy2

  $ hg diff --git --root . -r 1:tip
  diff --git a/new b/copy
  copy from new
  copy to copy
  --- a/new
  +++ b/copy
  @@ -1,1 +1,2 @@
   new
  +copy1
  $ hg diff --git --root . -r 1:tip copy
  diff --git a/new b/copy
  copy from new
  copy to copy
  --- a/new
  +++ b/copy
  @@ -1,1 +1,2 @@
   new
  +copy1
  $ hg diff --git --root . -r 1:tip ../dir2
  warning: ../dir2 not inside relative root . (glob)
  $ hg diff --git --root . -r 1:tip '../dir2/*'
  warning: ../dir2/* not inside relative root . (glob)
  $ cd ..

Rename:

  $ hg mv dir1/copy dir1/rename1
  $ echo rename1 >> dir1/rename1
  $ hg mv dir2/copy dir1/rename2
  $ echo rename2 >> dir1/rename2
  $ hg ci -mrename
  $ hg diff --git -r 2:tip
  diff --git a/dir1/copy b/dir1/rename1
  rename from dir1/copy
  rename to dir1/rename1
  --- a/dir1/copy
  +++ b/dir1/rename1
  @@ -1,2 +1,3 @@
   new
   copy1
  +rename1
  diff --git a/dir2/copy b/dir1/rename2
  rename from dir2/copy
  rename to dir1/rename2
  --- a/dir2/copy
  +++ b/dir1/rename2
  @@ -1,2 +1,3 @@
   new
   copy2
  +rename2

Cross and same-directory renames with a relative root:

  $ hg diff --root dir1 --git -r 2:tip
  diff --git a/copy b/rename1
  rename from copy
  rename to rename1
  --- a/copy
  +++ b/rename1
  @@ -1,2 +1,3 @@
   new
   copy1
  +rename1
  diff --git a/rename2 b/rename2
  new file mode 100644
  --- /dev/null
  +++ b/rename2
  @@ -0,0 +1,3 @@
  +new
  +copy2
  +rename2

  $ hg diff --root dir2 --git -r 2:tip
  diff --git a/copy b/copy
  deleted file mode 100644
  --- a/copy
  +++ /dev/null
  @@ -1,2 +0,0 @@
  -new
  -copy2

  $ hg diff --root dir1 --git -r 2:tip -I '**/copy'
  diff --git a/copy b/copy
  deleted file mode 100644
  --- a/copy
  +++ /dev/null
  @@ -1,2 +0,0 @@
  -new
  -copy1

  $ hg diff --root dir1 --git -r 2:tip -I '**/rename*'
  diff --git a/copy b/rename1
  copy from copy
  copy to rename1
  --- a/copy
  +++ b/rename1
  @@ -1,2 +1,3 @@
   new
   copy1
  +rename1
  diff --git a/rename2 b/rename2
  new file mode 100644
  --- /dev/null
  +++ b/rename2
  @@ -0,0 +1,3 @@
  +new
  +copy2
  +rename2

Delete:

  $ hg rm dir1/*
  $ hg ci -mdelete
  $ hg diff --git -r 3:tip
  diff --git a/dir1/new b/dir1/new
  deleted file mode 100644
  --- a/dir1/new
  +++ /dev/null
  @@ -1,1 +0,0 @@
  -new
  diff --git a/dir1/rename1 b/dir1/rename1
  deleted file mode 100644
  --- a/dir1/rename1
  +++ /dev/null
  @@ -1,3 +0,0 @@
  -new
  -copy1
  -rename1
  diff --git a/dir1/rename2 b/dir1/rename2
  deleted file mode 100644
  --- a/dir1/rename2
  +++ /dev/null
  @@ -1,3 +0,0 @@
  -new
  -copy2
  -rename2

  $ cat > src <<EOF
  > 1
  > 2
  > 3
  > 4
  > 5
  > EOF
  $ hg ci -Amsrc
  adding src

#if execbit

chmod 644:

  $ chmod +x src
  $ hg ci -munexec
  $ hg diff --git -r 5:tip
  diff --git a/src b/src
  old mode 100644
  new mode 100755

Rename+mod+chmod:

  $ hg mv src dst
  $ chmod -x dst
  $ echo a >> dst
  $ hg ci -mrenamemod
  $ hg diff --git -r 6:tip
  diff --git a/src b/dst
  old mode 100755
  new mode 100644
  rename from src
  rename to dst
  --- a/src
  +++ b/dst
  @@ -3,3 +3,4 @@
   3
   4
   5
  +a

Nonexistent in tip+chmod:

  $ hg diff --git -r 5:6
  diff --git a/src b/src
  old mode 100644
  new mode 100755

#else

Dummy changes when no exec bit, mocking the execbit commit structure

  $ echo change >> src
  $ hg ci -munexec
  $ hg mv src dst
  $ hg ci -mrenamemod

#endif

Binary diff:

  $ cp "$TESTDIR/binfile.bin" .
  $ hg add binfile.bin
  $ hg diff --git > b.diff
  $ cat b.diff
  diff --git a/binfile.bin b/binfile.bin
  new file mode 100644
  index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..37ba3d1c6f17137d9c5f5776fa040caf5fe73ff9
  GIT binary patch
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  z000XU0RWnu7ytkO2XskIMF-Uh9TW;VpMjwv0005-Nkl<ZD9@FWPs=e;7{<>W$NUkd
  zX$nnYLt$-$V!?uy+1V%`z&Eh=ah|duER<4|QWhju3gb^nF*8iYobxWG-qqXl=2~5M
  z*IoDB)sG^CfNuoBmqLTVU^<;@nwHP!1wrWd`{(mHo6VNXWtyh{alzqmsH*yYzpvLT
  zLdY<T=ks|woh-`&01!ej#(xbV1f|pI*=%;d-%F*E*X#ZH`4I%6SS+$EJDE&ct=8po
  ziN#{?_j|kD%Cd|oiqds`xm@;oJ-^?NG3Gdqrs?5u*zI;{nogxsx~^|Fn^Y?Gdc6<;
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  z9C)5jBoYw9^?EHyQl(M}1OlQcCX>lXB*ODN003Z&P17_@)3Pi=i0wb04<W?v-u}7K
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Import binary diff:

  $ hg revert binfile.bin
  $ rm binfile.bin
  $ hg import -mfoo b.diff
  applying b.diff
  $ cmp binfile.bin "$TESTDIR/binfile.bin"

Rename binary file:

  $ hg mv binfile.bin renamed.bin
  $ hg diff --git
  diff --git a/binfile.bin b/renamed.bin
  rename from binfile.bin
  rename to renamed.bin

Diff across many revisions:

  $ hg mv dst dst2
  $ hg ci -m 'mv dst dst2'

  $ echo >> start
  $ hg ci -m 'change start'

  $ hg revert -r -2 start
  $ hg mv dst2 dst3
  $ hg ci -m 'mv dst2 dst3; revert start'

  $ hg diff --git -r 9:11
  diff --git a/dst2 b/dst3
  rename from dst2
  rename to dst3

Reversed:

  $ hg diff --git -r 11:9
  diff --git a/dst3 b/dst2
  rename from dst3
  rename to dst2


  $ echo a >> foo
  $ hg add foo
  $ hg ci -m 'add foo'
  $ echo b >> foo
  $ hg ci -m 'change foo'
  $ hg mv foo bar
  $ hg ci -m 'mv foo bar'
  $ echo c >> bar
  $ hg ci -m 'change bar'

File created before r1 and renamed before r2:

  $ hg diff --git -r -3:-1
  diff --git a/foo b/bar
  rename from foo
  rename to bar
  --- a/foo
  +++ b/bar
  @@ -1,2 +1,3 @@
   a
   b
  +c

Reversed:

  $ hg diff --git -r -1:-3
  diff --git a/bar b/foo
  rename from bar
  rename to foo
  --- a/bar
  +++ b/foo
  @@ -1,3 +1,2 @@
   a
   b
  -c

File created in r1 and renamed before r2:

  $ hg diff --git -r -4:-1
  diff --git a/foo b/bar
  rename from foo
  rename to bar
  --- a/foo
  +++ b/bar
  @@ -1,1 +1,3 @@
   a
  +b
  +c

Reversed:

  $ hg diff --git -r -1:-4
  diff --git a/bar b/foo
  rename from bar
  rename to foo
  --- a/bar
  +++ b/foo
  @@ -1,3 +1,1 @@
   a
  -b
  -c

File created after r1 and renamed before r2:

  $ hg diff --git -r -5:-1
  diff --git a/bar b/bar
  new file mode 100644
  --- /dev/null
  +++ b/bar
  @@ -0,0 +1,3 @@
  +a
  +b
  +c

Reversed:

  $ hg diff --git -r -1:-5
  diff --git a/bar b/bar
  deleted file mode 100644
  --- a/bar
  +++ /dev/null
  @@ -1,3 +0,0 @@
  -a
  -b
  -c


Comparing with the working dir:

  $ echo >> start
  $ hg ci -m 'change start again'

  $ echo > created
  $ hg add created
  $ hg ci -m 'add created'

  $ hg mv created created2
  $ hg ci -m 'mv created created2'

  $ hg mv created2 created3

There's a copy in the working dir:

  $ hg diff --git
  diff --git a/created2 b/created3
  rename from created2
  rename to created3

There's another copy between the original rev and the wd:

  $ hg diff --git -r -2
  diff --git a/created b/created3
  rename from created
  rename to created3

The source of the copy was created after the original rev:

  $ hg diff --git -r -3
  diff --git a/created3 b/created3
  new file mode 100644
  --- /dev/null
  +++ b/created3
  @@ -0,0 +1,1 @@
  +
  $ hg ci -m 'mv created2 created3'


  $ echo > brand-new
  $ hg add brand-new
  $ hg ci -m 'add brand-new'
  $ hg mv brand-new brand-new2

Created in parent of wd; renamed in the wd:

  $ hg diff --git
  diff --git a/brand-new b/brand-new2
  rename from brand-new
  rename to brand-new2

Created between r1 and parent of wd; renamed in the wd:

  $ hg diff --git -r -2
  diff --git a/brand-new2 b/brand-new2
  new file mode 100644
  --- /dev/null
  +++ b/brand-new2
  @@ -0,0 +1,1 @@
  +
  $ hg ci -m 'mv brand-new brand-new2'

One file is copied to many destinations and removed:

  $ hg cp brand-new2 brand-new3
  $ hg mv brand-new2 brand-new3-2
  $ hg ci -m 'multiple renames/copies'
  $ hg diff --git -r -2 -r -1
  diff --git a/brand-new2 b/brand-new3
  rename from brand-new2
  rename to brand-new3
  diff --git a/brand-new2 b/brand-new3-2
  copy from brand-new2
  copy to brand-new3-2

Reversed:

  $ hg diff --git -r -1 -r -2
  diff --git a/brand-new3-2 b/brand-new2
  rename from brand-new3-2
  rename to brand-new2
  diff --git a/brand-new3 b/brand-new3
  deleted file mode 100644
  --- a/brand-new3
  +++ /dev/null
  @@ -1,1 +0,0 @@
  -

There should be a trailing TAB if there are spaces in the file name:

  $ echo foo > 'with spaces'
  $ hg add 'with spaces'
  $ hg diff --git
  diff --git a/with spaces b/with spaces
  new file mode 100644
  --- /dev/null
  +++ b/with spaces	
  @@ -0,0 +1,1 @@
  +foo
  $ hg ci -m 'add filename with spaces'

Additions should be properly marked even in the middle of a merge

  $ hg up -r -2
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ echo "New File" >> inmerge
  $ hg add inmerge
  $ hg ci -m "file in merge"
  created new head
  $ hg up 23
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg merge
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg diff -g
  diff --git a/inmerge b/inmerge
  new file mode 100644
  --- /dev/null
  +++ b/inmerge
  @@ -0,0 +1,1 @@
  +New File