As work towards supporting multiple diagnostic outputs (where each
output has its own pretty_printer), avoid passing around
diagnostic_context to the various printing routines, so that we
can be more explicit about which pretty_printer is in use.

Introduce a set of "policy" classes that capture the parts of
diagnostic_context that are needed, and use these rather than
diagnostic_context *.  Pass around pretty_printer & rather than
taking value from context.  Split out the pretty_printer-using code
from class layout into a new class layout_printer, separating the
responsibilities of determining layout when quoting source versus
actually printing the source.

No functional change intended.

gcc/analyzer/ChangeLog:
	PR other/116613
	* program-point.cc (function_point::print_source_line): Replace
	call to diagnostic_show_locus with a call to
	diagnostic_source_print_policy::print.

gcc/ChangeLog:
	PR other/116613
	* diagnostic-format-json.cc (json_from_expanded_location): Replace
	call to diagnostic_context::converted_column with call to
	diagnostic_column_policy::converted_column.
	* diagnostic-format-sarif.cc
	(sarif_builder::make_location_object): Replace call to
	diagnostic_show_locus with call to
	diagnostic_source_print_policy::print.
	* diagnostic-format-text.cc (get_location_text): Replace call to
	diagnostic_context::get_location_text with call to
	diagnostic_column_policy::get_location_text.
	(diagnostic_text_output_format::report_current_module): Replace call
	to diagnostic_context::converted_column with call to
	diagnostic_column_policy::converted_column.
	* diagnostic-format-text.h
	(diagnostic_text_output_format::diagnostic_output_format):
	Initialize m_column_policy.
	(diagnostic_text_output_format::get_column_policy): New.
	(diagnostic_text_output_format::m_column_policy): New.
	* diagnostic-path.cc (class path_print_policy): New.
	(event_range::maybe_add_event): Replace diagnostic_context param
	with path_print_policy.
	(event_range::print): Convert "pp" from * to &.  Convert first
	param of start_span callback from diagnostic_context to
	diagnostic_location_print_policy.
	(path_summary::path_summary): Convert first param from
	diagnostic_text_output_format to path_print_policy.  Add
	colorize param.  Update for changes to
	event_range::maybe_add_event.
	(thread_event_printer::print_swimlane_for_event_range): Assert
	that pp is non-null.  Update for change to event_range::print.
	(diagnostic_text_output_format::print_path): Pass
	path_print_policy to path_summary's ctor.
	(selftest::test_empty_path): Likewise.
	(selftest::test_intraprocedural_path): Likewise.
	(selftest::test_interprocedural_path_1): Likewise.
	(selftest::test_interprocedural_path_2): Likewise.
	(selftest::test_recursion): Likewise.
	(selftest::test_control_flow_1): Likewise.
	(selftest::test_control_flow_2): Likewise.
	(selftest::test_control_flow_3): Likewise.
	(selftest::assert_cfg_edge_path_streq): Likewise.
	(selftest::test_control_flow_5): Likewise.
	(selftest::test_control_flow_6): Likewise.
	* diagnostic-show-locus.cc (colorizer::set_range): Update for
	change to m_pp.
	(colorizer::m_pp): Convert from * to &.
	(class layout): Add friend class layout_printer and move various
	decls to it.
	(layout::m_pp): Drop field.
	(layout::m_policy): Rename to...
	(layout::m_char_policy): ...this.
	(layout::m_colorizer): Move field to class layout_printer.
	(layout::m_diagnostic_path_p): Drop field.
	(class layout_printer): New class, by refactoring class layout.
	(colorizer::colorizer): Convert "pp" param from * to &.
	(colorizer::set_named_color): Update for above change.
	(colorizer::begin_state): Likewise.
	(colorizer::finish_state): Likewise.
	(make_policy): Rename to...
	(make_char_policy): ...this, and update param from
	diagnostic_context to diagnostic_source_print_policy.
	(layout::layout): Update param from diagnostic_context to
	diagnostic_source_print_policy.  Drop params "diagnostic_kind" and
	"pp", moving these and other material to class layout_printer.
	(layout::maybe_add_location_range): Update for renamed field.
	(layout::print_gap_in_line_numbering): Convert to...
	(layout_printer::print_gap_in_line_numbering): ...this.
	(layout::calculate_x_offset_display): Update for renamed field.
	(layout::print_source_line): Convert to...
	(layout_printer::print_source_line): ...this.
	(layout::print_leftmost_column): Convert to...
	(layout_printer::print_leftmost_column): ...this.
	(layout::start_annotation_line): Convert to...
	(layout_printer::start_annotation_line): ...this.
	(layout::print_annotation_line): Convert to...
	(layout_printer::print_annotation_line): ...this.
	(layout::print_any_labels): Convert to...
	(layout_printer::print_any_labels): ...this.
	(layout::print_leading_fixits): Convert to...
	(layout_printer::print_leading_fixits): ...this.
	(layout::print_trailing_fixits): Convert to...
	(layout_printer::print_trailing_fixits): ...this.
	(layout::print_newline): Convert to...
	(layout_printer::print_newline): ...this.
	(layout::get_state_at_point): Make const.
	(layout::get_x_bound_for_row): Make const.
	(layout::move_to_column): Convert to...
	(layout_printer::move_to_column): ...this.
	(layout::show_ruler): Convert to...
	(layout_printer::show_ruler): ...this.
	(layout::print_line): Convert to...
	(layout_printer::print_line): ...this.
	(layout::print_any_right_to_left_edge_lines): Convert to...
	(layout_printer::print_any_right_to_left_edge_lines): ...this.
	(layout::print_any_right_to_left_edge_lines): Likewise.
	(layout_printer::layout_printer): New.
	(layout::update_any_effects): Delete, moving logic to
	layout_printer::print.
	(gcc_rich_location::add_location_if_nearby): Update param from
	diagnostic_context to diagnostic_source_print_policy.  Add
	overload taking a diagnostic_context.
	(diagnostic_context::maybe_show_locus): Move handling of null
	pretty_printer here, from layout ctor.  Convert call to
	diagnostic_context::show_locus to
	diagnostic_source_print_policy::print.
	(diagnostic_source_print_policy::diagnostic_source_print_policy):
	New.
	(diagnostic_context::show_locus): Convert to...
	(diagnostic_source_print_policy::print): ...this.  Convert pp
	from * to &.
	(layout_printer::print): New, based on material in
	diagnostic_context::show_locus.
	(selftest::make_char_policy): New.
	(selftest::test_display_widths): Update for above changes.
	(selftest::test_offset_impl): Likewise.
	(selftest::test_layout_x_offset_display_utf8): Likewise.
	(selftest::test_layout_x_offset_display_tab): Likewise.
	(selftest::test_diagnostic_show_locus_unknown_location): Use
	test_diagnostic_context::test_show_locus rather than
	diagnostic_show_locus.
	(selftest::test_one_liner_no_column): Likewise.
	(selftest::test_one_liner_caret_and_range): Likewise.
	(selftest::test_one_liner_multiple_carets_and_ranges): Likewise.
	(selftest::test_one_liner_fixit_insert_before): Likewise.
	(selftest::test_one_liner_fixit_insert_after): Likewise.
	(selftest::test_one_liner_fixit_remove): Likewise.
	(selftest::test_one_liner_fixit_replace): Likewise.
	(selftest::test_one_liner_fixit_replace_non_equal_range):
	Likewise.
	(selftest::test_one_liner_fixit_replace_equal_secondary_range):
	Likewise.
	(selftest::test_one_liner_fixit_validation_adhoc_locations):
	Likewise.
	(selftest::test_one_liner_many_fixits_1): Likewise.
	(selftest::test_one_liner_many_fixits_2): Likewise.
	(selftest::test_one_liner_labels): Likewise.
	(selftest::test_one_liner_simple_caret_utf8): Likewise.
	(selftest::test_one_liner_caret_and_range_utf8): Likewise.
	(selftest::test_one_liner_multiple_carets_and_ranges_utf8):
	Likewise.
	(selftest::test_one_liner_fixit_insert_before_utf8): Likewise.
	(selftest::test_one_liner_fixit_insert_after_utf8): Likewise.
	(selftest::test_one_liner_fixit_remove_utf8): Likewise.
	(selftest::test_one_liner_fixit_replace_utf8): Likewise.
	(selftest::test_one_liner_fixit_replace_non_equal_range_utf8):
	Likewise.
	(selftest::test_one_liner_fixit_replace_equal_secondary_range_utf8):
	Likewise.
	(selftest::test_one_liner_fixit_validation_adhoc_locations_utf8):
	Likewise.
	(selftest::test_one_liner_many_fixits_1_utf8): Likewise.
	(selftest::test_one_liner_many_fixits_2_utf8): Likewise.
	(selftest::test_one_liner_labels_utf8): Likewise.
	(selftest::test_one_liner_colorized_utf8): Likewise.
	(selftest::test_add_location_if_nearby): Likewise.
	(selftest::test_diagnostic_show_locus_fixit_lines): Likewise.
	(selftest::test_overlapped_fixit_printing): Likewise.
	(selftest::test_overlapped_fixit_printing_utf8): Likewise.
	(selftest::test_overlapped_fixit_printing_2): Likewise.
	(selftest::test_fixit_insert_containing_newline): Likewise.
	(selftest::test_fixit_insert_containing_newline_2): Likewise.
	(selftest::test_fixit_replace_containing_newline): Likewise.
	(selftest::test_fixit_deletion_affecting_newline): Likewise.
	(selftest::test_tab_expansion): Likewise.
	(selftest::test_escaping_bytes_1): Likewise.
	(selftest::test_escaping_bytes_2): Likewise.
	(selftest::test_line_numbers_multiline_range): Likewise.
	* diagnostic.cc
	(diagnostic_column_policy::diagnostic_column_policy): New.
	(diagnostic_context::converted_column): Convert to...
	(diagnostic_column_policy::converted_column): ...this.
	(diagnostic_context::get_location_text): Convert to...
	(diagnostic_column_policy::get_location_text): ...this, adding
	"show_column" param.
	(diagnostic_location_print_policy::diagnostic_location_print_policy):
	New ctors.
	(default_diagnostic_start_span_fn): Convert param from
	diagnostic_context * to const diagnostic_location_print_policy &.
	Add "pp" param.
	(selftest::assert_location_text): Update for above changes.
	(selftest::test_diagnostic_get_location_text): Rename to...
	(selftest::test_get_location_text): ...this.
	(selftest::c_diagnostic_cc_tests): Update for renaming.
	* diagnostic.h (class diagnostic_location_print_policy): New
	forward decl.
	(class diagnostic_source_print_policy): New forward decl.
	(diagnostic_start_span_fn): Convert first param from
	diagnostic_context * to const diagnostic_location_print_policy &
	and add pretty_printer * param.
	(class diagnostic_column_policy): New.
	(class diagnostic_location_print_policy): New.
	(class diagnostic_source_print_policy): New.
	(class diagnostic_context): Add friend class
	diagnostic_source_print_policy.
	(diagnostic_context::converted_column): Drop decl in favor of
	diagnostic_column_policy::converted_column.
	(diagnostic_context::get_location_text): Drop decl in favor of
	diagnostic_column_policy::get_location_text.
	(diagnostic_context::show_locus): Drop decl in favor of
	diagnostic_source_print_policy::print.
	(default_diagnostic_start_span_fn): Update for change to
	diagnostic_start_span_fn.
	* gcc-rich-location.h (class diagnostic_source_print_policy): New
	forward decl.
	(gcc_rich_location::add_location_if_nearby): Convert first param
	from diagnostic_context to diagnostic_source_print_policy.  Add
	overload taking diagnostic_context.
	* selftest-diagnostic.cc
	(selftest::test_diagnostic_context::test_diagnostic_context): Turn
	off colorization.
	(selftest::test_diagnostic_context::start_span_cb): Update for
	change to callback type.
	(test_diagnostic_context::test_show_locus): New.
	* selftest-diagnostic.h
	(selftest::test_diagnostic_context::start_span_cb): Update for
	change to callback type.
	(test_diagnostic_context::test_show_locus): New decl.

gcc/fortran/ChangeLog:
	PR other/116613
	* error.cc (gfc_diagnostic_build_locus_prefix): Convert first
	param from diagnostic_context * to
	const diagnostic_location_print_policy &.  Add colorize param.
	Likewise for the "two expanded_locations" overload.
	(gfc_diagnostic_text_starter): Update for above changes.
	(gfc_diagnostic_start_span): Update for change to callback type.

gcc/testsuite/ChangeLog:
	PR other/116613
	* gcc.dg/plugin/diagnostic_group_plugin.c
	(test_diagnostic_start_span_fn): Update for change to callback
	type.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>