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A few minor changes, including fixing the syntax of a typeclass declaration.

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A few minor changes, including fixing the syntax of a typeclass declaration.
The methods inside a typeclass declaration no longer have a ":-" at the start.

compiler/make_hlds.m:
        Give an error message is a typeclass is multiply defined.
compiler/prog_io.m:
        Export parse_decl, and make the output a maybe_item_and_context so
        that it is more useful to prog_io_typeclass.
compiler/prog_io_typeclass.m:
        Use parse_decl rather than parse_item to parse the class methods. This
        way the ":-" is left off.
compiler/notes/compiler_design.html:
        Document why check_typeclass is the final semantic analysis pass.
This commit is contained in:
David Jeffery
1998-01-07 06:09:44 +00:00
parent dd7f6598ae
commit 72ff8fffe3
4 changed files with 34 additions and 21 deletions
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15
compiler/notes/compiler_design.html
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@@ -313,12 +313,13 @@ in an HLDS goal.
check_typeclass.m checks that, each instance declaration, that the
types, modes and determinism of each predicate/function that is a
method of the class is correct (ie. that it matches the typeclass
declaration). In this pass, pred_ids and proc_ids are assigned to
the methods for each instance. In addition, while checking that the
superclasses of a class are satisfied by the instance declaration, a
set of constraint_proofs are built up for the superclass constraints.
These are used by polymorphism.m when generating the
base_typeclass_info for the instance.
declaration). This pass is performed at the end of semantic analysis
because it needs mode and determinism information. In this pass,
pred_ids and proc_ids are assigned to the methods for each instance. In
addition, while checking that the superclasses of a class are satisfied
by the instance declaration, a set of constraint_proofs are built up
for the superclass constraints. These are used by polymorphism.m when
generating the base_typeclass_info for the instance.
<dt> simplification (simplify.m)
@@ -792,6 +793,6 @@ Some of them are obsolete; other are work-in-progress.
<hr>
<!-------------------------->
Last update was $Date: 1998-01-02 00:11:10 $ by $Author: fjh $@cs.mu.oz.au. <br>
Last update was $Date: 1998-01-07 06:09:44 $ by $Author: dgj $@cs.mu.oz.au. <br>
</body>
</html>