llvm-project/llvm/lib/Transforms/ObjCARC
Chandler Carruth cdf4788401 [C++11] Add range based accessors for the Use-Def chain of a Value.
This requires a number of steps.
1) Move value_use_iterator into the Value class as an implementation
   detail
2) Change it to actually be a *Use* iterator rather than a *User*
   iterator.
3) Add an adaptor which is a User iterator that always looks through the
   Use to the User.
4) Wrap these in Value::use_iterator and Value::user_iterator typedefs.
5) Add the range adaptors as Value::uses() and Value::users().
6) Update *all* of the callers to correctly distinguish between whether
   they wanted a use_iterator (and to explicitly dig out the User when
   needed), or a user_iterator which makes the Use itself totally
   opaque.

Because #6 requires churning essentially everything that walked the
Use-Def chains, I went ahead and added all of the range adaptors and
switched them to range-based loops where appropriate. Also because the
renaming requires at least churning every line of code, it didn't make
any sense to split these up into multiple commits -- all of which would
touch all of the same lies of code.

The result is still not quite optimal. The Value::use_iterator is a nice
regular iterator, but Value::user_iterator is an iterator over User*s
rather than over the User objects themselves. As a consequence, it fits
a bit awkwardly into the range-based world and it has the weird
extra-dereferencing 'operator->' that so many of our iterators have.
I think this could be fixed by providing something which transforms
a range of T&s into a range of T*s, but that *can* be separated into
another patch, and it isn't yet 100% clear whether this is the right
move.

However, this change gets us most of the benefit and cleans up
a substantial amount of code around Use and User. =]

llvm-svn: 203364
2014-03-09 03:16:01 +00:00
..
ARCRuntimeEntryPoints.h Revert "Give internal classes hidden visibility." 2013-09-11 18:05:11 +00:00
CMakeLists.txt Extracted ObjCARCContract from ObjCARCOpts into its own file. 2013-01-29 03:03:03 +00:00
DependencyAnalysis.cpp [Modules] Move CFG.h to the IR library as it defines graph traits over 2014-03-04 11:45:46 +00:00
DependencyAnalysis.h [objc-arc] Changed 'mode: c++' => 'C++' at Nick Lewycky's suggestion. Also removed unnecessary mode: c++ lines from .cpp files. 2013-07-10 18:49:00 +00:00
LLVMBuild.txt Added missing dashes from header declaration comment. 2013-01-29 04:53:55 +00:00
Makefile
ObjCARC.cpp This patch breaks up Wrap.h so that it does not have to include all of 2013-05-01 20:59:00 +00:00
ObjCARC.h [Modules] Move CallSite into the IR library where it belogs. It is 2014-03-04 11:01:28 +00:00
ObjCARCAPElim.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 09:10:37 +00:00
ObjCARCAliasAnalysis.cpp [objc-arc] Changed 'mode: c++' => 'C++' at Nick Lewycky's suggestion. Also removed unnecessary mode: c++ lines from .cpp files. 2013-07-10 18:49:00 +00:00
ObjCARCAliasAnalysis.h [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 09:10:37 +00:00
ObjCARCContract.cpp [C++11] Add range based accessors for the Use-Def chain of a Value. 2014-03-09 03:16:01 +00:00
ObjCARCExpand.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 09:10:37 +00:00
ObjCARCOpts.cpp [C++11] Add range based accessors for the Use-Def chain of a Value. 2014-03-09 03:16:01 +00:00
ObjCARCUtil.cpp [objc-arc] Changed 'mode: c++' => 'C++' at Nick Lewycky's suggestion. Also removed unnecessary mode: c++ lines from .cpp files. 2013-07-10 18:49:00 +00:00
ProvenanceAnalysis.cpp [C++11] Add range based accessors for the Use-Def chain of a Value. 2014-03-09 03:16:01 +00:00
ProvenanceAnalysis.h Revert "Give internal classes hidden visibility." 2013-09-11 18:05:11 +00:00