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Make the declarations for the globals variables used to implement mutables
visible across module boundaries. Not doing so means that we cannot inline
the access predicates across module boundaries (this is currently causing
the tests for mutables and sub-modules to fail on that compile with
--intermodule-optimization).
Doing so requires us to module qualify the globals in the generated code, this
diff also fixes an earlier XXX about not mangling the names of mutables.
Add another mutable attribute, foreign_name, that allows the user to override
the compiler's choice of name for the global variable. This is useful where
foreign code needs also needs to access the mutable, e.g. in library
bindings. Currently, we only support this facility in the C backends.
(Actually, it's almost implemented for the other backends as well, but
there's no way to test it at the moment).
Support `trailed' and `not_thread_safe' as mutable attributes. These are
the defaults so in practice they will probably rarely be used.
compiler/make_hlds_passes.m:
If there is a foreign_name attribute for a mutable, then use that name
rather than a compiler generated one.
Make sure that there is a declaration for the global variable in the
module's .mh file.
Emit an error message if an attempt is made to use a trailed mutable
in a non-trailing grade.
compiler/prog_mutable.m:
Append the module name to the name of the global variable used to
implement the mutable.
compiler/prog_data.m:
Make the set of mutable attributes into an abstract type. Handle this
in a similar fashion to foreign code attributes.
Add access predicates for the above type.
Fix the positioning of comments and section headings in this module.
Unrelated change: add a comment explaining why the intermediate
form of the constraints in the termination2_info pragmas is necessary.
compiler/prog_io.m:
Parse the new mutable attributes.
Update the description of the source-to-source transformation used to
implement mutable variables.
compiler/prog_io_pragma.m:
Export the predicate parse_foreign_language/2. It is now needed
by the code that parses mutable declarations.
compiler/globals.m:
Add a function that returns the compilation target as a string.
doc/reference_manual.m:
Document the new attributes.
tests/invalid/Mmakefile:
tests/invalid/Mercury.options:
tests/invalid/trailed_mutable.m:
tests/invalid/trailed_mutable.err_exp:
Test the error message that results if a trailed mutable is used in a
non-trailing grade.
tests/hard_coded/bad_mutable.{m,err_exp}:
Extend this test case to cover the new attributes.
tests/hard_coded/Mmakefile:
tests/hard_coded/foreign_name_mutable.{m,exp}:
tests/hard_coded/unusual_name_mutable.{m,exp}:
Further test for mutable variables.
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