Commit Graph

11 Commits

Author SHA1 Message Date
Dan Gohman
29384efb76 Teach ValueHandleBase to treat DenseMap's special Empty and Tombstone
values the same way it treats null pointers. This is needed to allow
CallbackVH to be used as a key in a DenseMap.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77695 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-31 18:20:18 +00:00
Devang Patel
e8b3e02dce Fix comment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77603 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-30 17:25:33 +00:00
Dan Gohman
0ec4146db7 Add simplify_type specializations to allow WeakVH, AssertingVH, and
CallbackVH to participate in dyn_cast, isa, etc. without needing
an explicit conversion.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71087 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-06 17:12:48 +00:00
Dan Gohman
ff9977f8cd Add an explicit keyword.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71022 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-05 21:23:20 +00:00
Dan Gohman
c09b12c622 Apply Jeffrey Yasskin's CallbackVH patch, with minor tweaks from me
to make the copy constructor and destructor protected, and corresponding
adjustments to the unittests.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70644 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-02 21:10:48 +00:00
Jeffrey Yasskin
487fa01673 Add tests for WeakVH and AssertingVH. These pointed out that the overloads for
the comparison operators were not only unnecessary in the presence of the
implicit conversion; they caused ambiguous overload errors. So I deleted them.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70243 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-27 20:32:07 +00:00
Nick Lewycky
7c53316922 Fix missing text in doxygen documentation.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69529 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-19 18:20:21 +00:00
Chris Lattner
b7a00daa11 Work around an apparent GCC miscompilation by specializing different,
this fixes a regression on some compilers from r68147.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68356 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-03 00:26:01 +00:00
Chris Lattner
6caced9564 add missing *
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68350 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-02 23:53:03 +00:00
Chris Lattner
b160f5d36d add a converting operator
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68158 91177308-0d34-0410-b5e6-96231b3b80d8
2009-03-31 23:09:51 +00:00
Chris Lattner
722272df41 Add two new classes: WeakVH and AssertingVH. These are both "ValueHandles",
which are effectively smart pointers to Value*'s.  They are both very light
weight and simple, and react to values being destroyed or being RAUW'd.

WeakVN does a best effort to follow a value around, including through RAUW 
operations and will get nulled out of the value is destroyed.  This is useful
for the eventual "metadata that references a value" work, because it is a
reference to a value that does not show up on its use_* list.

AssertingVH is a pointer that compiles down to a dumb raw pointer when 
assertions are disabled.  When enabled, it emits an assertion if the 
pointed-to value is destroyed while it is still being referenced.  This
is very useful for Maps and other things, and should have caught the recent
bugs in CallGraph and Reassociate, for example.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68149 91177308-0d34-0410-b5e6-96231b3b80d8
2009-03-31 22:11:05 +00:00