[GHC] #14709: Extend the plugin mechanism to access program representation

[GHC]

#14709: Extend the plugin mechanism to access program representation
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           Reporter:  lazac          |             Owner:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  GHC API        |           Version:  8.2.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
  https://phabricator.haskell.org/D4342|  https://ghc.haskell.org/trac/ghc/wiki/ExtendedPluginsProposal
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 This would enable development tools to access the GHC representation in
 the pre-existing build environment. By the inversion of control, the tool
 developers don't need to decide which Haskell modules have to be processed
 and with what configuration, because the normal build procedure could be
 invoked by the user with plugin flags specifying what tools to invoke.

 The plan is described in more details at
 [https://ghc.haskell.org/trac/ghc/wiki/ExtendedPluginsProposal Extended
 Plugins Proposal]

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14709>
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