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[PATCH 04/11] Automated conversion of passes to C++ classes


This is the automated part of the conversion of passes from C structs to
C++ classes.

It is generated by the refactor_passes.py script in
https://github.com/davidmalcolm/gcc-refactoring-scripts

The script has its own test suite: test_refactor_passes.py, and you can
get an idea of the behavior of the script by reviewing the test suite.

This patch converts all existing pass structs for say RTL pass_foo into
the following:

  namespace {

  const pass_data pass_data_foo =
  {
     /* initialization data */
  };

  class pass_foo : public rtl_opt_pass
  {
  public:
    pass_web(gcc::context *ctxt)
      : rtl_opt_pass(pass_data_web, ctxt)
    {}

   /* opt_pass methods: */
   bool gate () { return gate_foo (); }
   unsigned int execute () { return execute_foo (); }

  }; // class pass_foo

  } // anon namespace

  rtl_opt_pass *
  make_pass_foo (gcc::context *ctxt)
  {
    return new pass_foo (ctxt);
  }

so that the only exposed API to the pass is the factory function (i.e.
"make_pass_foo").

It also updates tree-pass.h to replace all of the struct declarations:

  extern struct rtl_opt_pass pass_foo;

with those of the new factory functions:

  extern rtl_opt_pass *make_pass_foo (gcc::context *ctxt);

The full patch is 500k in size; I have posted it to:
  http://dmalcolm.fedorapeople.org/gcc/large-patches/15e12880a4c291deb984fb628e3142429019b263-0004-Automated-conversion-of-passes-to-C-classes.patch
to avoid exceeding mailing list size limits (that version of the patch
includes the ChangeLog entries).


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