This differs from the previous version by being more careful about template
instantiation/specialization in order to prevent errors when building with
clang -Werror. Specifically:
 * begin is not defined in the template and is instead instantiated when Head
   is. I think the warning when we don't do that is wrong (PR28815) but for now
   at least do it this way to avoid the warning.
 * Instead of performing template specializations in LLVM_INSTANTIATE_REGISTRY
   instead provide a template definition then do explicit instantiation. No
   compiler I've tried has problems with doing it the other way, but strictly
   speaking it's not permitted by the C++ standard so better safe than sorry.

Original commit message:

Currently the Registry class contains the vestiges of a previous attempt to
allow plugins to be used on Windows without using BUILD_SHARED_LIBS, where a
plugin would have its own copy of a registry and export it to be imported by
the tool that's loading the plugin. This only works if the plugin is entirely
self-contained with the only interface between the plugin and tool being the
registry, and in particular this conflicts with how IR pass plugins work.

This patch changes things so that instead the add_node function of the registry
is exported by the tool and then imported by the plugin, which solves this
problem and also means that instead of every plugin having to export every
registry they use instead LLVM only has to export the add_node functions. This
allows plugins that use a registry to work on Windows if
LLVM_EXPORT_SYMBOLS_FOR_PLUGINS is used.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@277806 91177308-0d34-0410-b5e6-96231b3b80d8

Buildbot failures when building with clang -Werror. Reverting while I try to
figure this out.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@277008 91177308-0d34-0410-b5e6-96231b3b80d8

This version has two fixes compared to the original:
 * In Registry.h the template static members are instantiated before they are
   used, as clang gives an error if you do it the other way around.
 * The use of the Registry template in clang-tidy is updated in the same way as
   has been done everywhere else.

Original commit message:

Currently the Registry class contains the vestiges of a previous attempt to
allow plugins to be used on Windows without using BUILD_SHARED_LIBS, where a
plugin would have its own copy of a registry and export it to be imported by
the tool that's loading the plugin. This only works if the plugin is entirely
self-contained with the only interface between the plugin and tool being the
registry, and in particular this conflicts with how IR pass plugins work.

This patch changes things so that instead the add_node function of the registry
is exported by the tool and then imported by the plugin, which solves this
problem and also means that instead of every plugin having to export every
registry they use instead LLVM only has to export the add_node functions. This
allows plugins that use a registry to work on Windows if
LLVM_EXPORT_SYMBOLS_FOR_PLUGINS is used.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@276973 91177308-0d34-0410-b5e6-96231b3b80d8

This is causing a huge pile of buildbot failures.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@276857 91177308-0d34-0410-b5e6-96231b3b80d8

Currently the Registry class contains the vestiges of a previous attempt to
allow plugins to be used on Windows without using BUILD_SHARED_LIBS, where a
plugin would have its own copy of a registry and export it to be imported by
the tool that's loading the plugin. This only works if the plugin is entirely
self-contained with the only interface between the plugin and tool being the
registry, and in particular this conflicts with how IR pass plugins work.

This patch changes things so that instead the add_node function of the registry
is exported by the tool and then imported by the plugin, which solves this
problem and also means that instead of every plugin having to export every
registry they use instead LLVM only has to export the add_node functions. This
allows plugins that use a registry to work on Windows if
LLVM_EXPORT_SYMBOLS_FOR_PLUGINS is used.

Differential Revision: http://reviews.llvm.org/D21385


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@276856 91177308-0d34-0410-b5e6-96231b3b80d8

CMake 2.8.12 introduced interface libraries and some related policies. This removes the conditional block because we're now past 2.8.12.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@272312 91177308-0d34-0410-b5e6-96231b3b80d8

  - Externalize the registry.
  - Update libdeps.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@265301 91177308-0d34-0410-b5e6-96231b3b80d8

This allows plugins which add AST passes to also define pragmas to do things
like only enable certain behaviour of the AST pass in files where a certain
pragma is used.

Differential Revision: http://reviews.llvm.org/D18319


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@265295 91177308-0d34-0410-b5e6-96231b3b80d8

Currently when an AST plugin is loaded it must then be enabled by passing
-plugin pluginname or -add-plugin pluginname to the -cc1 command line. This
patch adds a method to PluginASTAction which allows it to declare that the
action happens before, instead of, or after the main AST action, plus the
relevant changes to make the plugin action happen at that time automatically.

Differential Revision: http://reviews.llvm.org/D17959


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@263546 91177308-0d34-0410-b5e6-96231b3b80d8