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Zoltan Somogyi 5eee81204e A big step towards cleaning up the way we handle errors.

Estimated hours taken: 28
Branches: main

A big step towards cleaning up the way we handle errors. The main changes are

- the provision, in error_util.m, of a mechanism for completely specifying
  everything to do with a single error in one data structure,

- the conversion of typecheck_errors.m from using io.write_string to
  using this new capability,

- the conversion of mode_errors.m and det_report.m from using
  write_error_pieces to using this new capability, and

- consistently using the quoting style `symname'/N instead of `symname/N'
  in error_util and hlds_error_util (previously, error_util used the former
  but hlds_error_util used the latter).

This diff sets up later diffs which will collect all error specifications
in a central place and print them all at once, in order.

compiler/error_util.m:
	The new type error_spec, which completely specifies an error.
	An error_spec may have multiple components with different contexts
	and may have parts which are printed only under certain conditions,
	e.g. a given option being set. Each error_spec has a severity
	and also records which phase found the error.

	The new predicate write_error_spec takes care of updates of the exit
	status for errors and (if --halt-at-warn is set) for warnings. It also
	takes care of setting the flag that calls for the reminder about -E
	at the end.

	This diff also makes it simpler to use the ability to print arbitrary
	output. It adds the ability to include integers in messages directly,
	and the ability to create blank lines. It renames some function symbols
	to avoid ambiguities.

	Move a predicate that only used by typecheck_errors.m to that file.

compiler/hlds_error_util.m:
	Switch to the `symname'/N quoting style for describing predicates and
	procedures.

compiler/prog_util.m:
	Switch to the `symname'/N quoting style for describing
	sym_name_and_arity.

compiler/hlds_module.m:
	Provide a predicate to increment the number of errors not by one,
	but by the number of errors printed by write_error_spec.

	Fix some documentation rot.

compiler/typecheck_errors.m:
	Use write_error_spec instead of io.write_strings to print error
	messages. In several cases, improve the formatting of the messages
	printed.

	Mark a number of places where we don't (yet) update the number of
	errors in the module_info correctly.

	Rename the checkpoint predicate to avoid potential ambiguity with
	similar predicates in e.g. mode_info.

compiler/typecheck_info.m:
	Group the code for writing stuff out together in one bunch. For each
	such predicate, create another that returns a list of format components
	instead of doing I/O directly.

compiler/typecheck.m:
	Move the code for writing inference messages here from
	typecheck_errors.m, since these messages aren't errors.

compiler/mode_errors.m:
compiler/det_report.m:
	Use write_error_spec instead of write_error_pieces. In the case of
	mode_errors.m, this means we now get correct the set of circumstances
	in which we set the flag that calls for the reminder about -E.

compiler/add_pragma.m:
compiler/add_type.m:
	Convert some code that used to use write_error_pieces to print error
	messages to use write_error_spec instead.

compiler/assertion.m:
compiler/hlds_pred.m:
compiler/post_typecheck.m:
	Assertion.m used to contain some code to check for assertions in the
	interface that mention predicates that are not exported. Move most
	of this code to post_typecheck.m (which is where this code used to be
	called from). One small part, which is a test for a particular property
	of import_statuses, is moved to hlds_pred.m to be with all the other
	similar tests of import_statuses.

compiler/prog_util.m:
	Change unqualify_name from a predicate to a function.

compiler/pred_table.m:
compiler/hlds_out.m:
	Avoid some ambiguities by adding a suffix to the names of some
	predicates.

compiler/*.m:
	Conform to the changes above.

library/list.m:
	Add a function that was previously present (with different names)
	in two compiler modules.

tests/hard_coded/allow_stubs.exp:
	Update the format of the expected exception.

tests/invalid/errors2.err_exp2:
	Remove this file. As far as I can tell, it was never the correct
	expected output on the main branch. (It originated on the alias branch
	way back in the mists of time.)

tests/invalid/*.err_exp:
tests/invalid/purity/*.err_exp:
tests/warnings/*.exp:
	Update the format of the expected error messages.

tests/recompilation/*.err_exp.2:
	Update the format of the expected messages about what was modified.

2006-09-07 05:51:48 +00:00

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	Recompiling module `lambda_mode_r':
	mode `lambda_mode_r_2.foo_in'/0 was modified.