diagnostic-show-locus.c: handle fixits on lines outside the regular ranges

The diagnostic_show_locus implementation determines the set
of line spans that need printing based on the ranges within the
rich_location (in layout::calculate_line_spans).

Currently this doesn't take into account fix-it hints, and hence
we fail to print fix-it hints that are on lines outside of
those ranges.

This patch updates the implementation to take fix-it hints into
account when calculating the pertinent line spans, so that such fix-it
hints do get printed.  It also adds some validation, to ensure that
we don't attempt to print fix-its hints affecting a different source
file.

gcc/ChangeLog:
	* diagnostic-show-locus.c (class layout): Add field m_fixit_hints.
	(layout_range::intersects_line_p): New method.
	(test_range_contains_point_for_single_point): Rename to...
	(test_layout_range_for_single_point): ...this, and add testing
	for layout_range::intersects_line_p.
	(test_range_contains_point_for_single_line): Rename to...
	(test_layout_range_for_single_line): ...this,  and add testing
	for layout_range::intersects_line_p.
	(test_range_contains_point_for_multiple_lines): Rename to...
	(test_layout_range_for_multiple_lines): ...this,  and add testing
	for layout_range::intersects_line_p.
	(layout::layout): Populate m_fixit_hints.
	(layout::get_expanded_location): Handle the case of a line-span
	for a fix-it hint.
	(layout::validate_fixit_hint_p): New method.
	(get_line_span_for_fixit_hint): New function.
	(layout::calculate_line_spans): Add spans for fixit-hints.
	(layout::should_print_annotation_line_p): New method.
	(layout::print_any_fixits): Drop param "richloc", instead using
	validated fixits in m_fixit_hints.  Add "const" to hint pointers.
	(diagnostic_show_locus): Avoid printing blank annotation lines.
	(selftest::test_diagnostic_context::test_diagnostic_context):
	Initialize show_column and start_span.
	(selftest::test_diagnostic_context::start_span_cb): New static
	function.
	(selftest::test_diagnostic_show_locus_fixit_lines): New function.
	(selftest::diagnostic_show_locus_c_tests): Update for function
	renamings.  Call test_diagnostic_show_locus_fixit_lines.

libcpp/ChangeLog:
	* include/line-map.h (class fixit_remove): Remove stray decl.
	(fixit_hint::affects_line_p): Make const.
	(fixit_insert::affects_line_p): Likewise.
	(fixit_replace::affects_line_p): Likewise.
	* line-map.c (fixit_insert::affects_line_p): Likewise.
	(fixit_replace::affects_line_p): Likewise.

From-SVN: r239906

libcpp/ChangeLog

@@ -1,3 +1,12 @@
+2016-08-31  David Malcolm  <dmalcolm@redhat.com>
+
+	* include/line-map.h (class fixit_remove): Remove stray decl.
+	(fixit_hint::affects_line_p): Make const.
+	(fixit_insert::affects_line_p): Likewise.
+	(fixit_replace::affects_line_p): Likewise.
+	* line-map.c (fixit_insert::affects_line_p): Likewise.
+	(fixit_replace::affects_line_p): Likewise.
+
 2016-08-30  David Malcolm  <dmalcolm@redhat.com>
 
 	* include/line-map.h (class semi_embedded_vec): New class.

libcpp/include/line-map.h

@@ -1412,7 +1412,6 @@ semi_embedded_vec<T, NUM_EMBEDDED>::truncate (int len)
 
 class fixit_hint;
   class fixit_insert;
-  class fixit_remove;
   class fixit_replace;
 
 /* A "rich" source code location, for use when printing diagnostics.
@@ -1599,7 +1598,7 @@ public:
   virtual ~fixit_hint () {}
 
   virtual enum kind get_kind () const = 0;
-  virtual bool affects_line_p (const char *file, int line) = 0;
+  virtual bool affects_line_p (const char *file, int line) const = 0;
   virtual source_location get_start_loc () const = 0;
   virtual bool maybe_get_end_loc (source_location *out) const = 0;
   /* Vfunc for consolidating successor fixits.  */
@@ -1615,7 +1614,7 @@ class fixit_insert : public fixit_hint
 		const char *new_content);
   ~fixit_insert ();
   enum kind get_kind () const { return INSERT; }
-  bool affects_line_p (const char *file, int line);
+  bool affects_line_p (const char *file, int line) const;
   source_location get_start_loc () const { return m_where; }
   bool maybe_get_end_loc (source_location *) const { return false; }
   bool maybe_append_replace (line_maps *set,
@@ -1640,7 +1639,7 @@ class fixit_replace : public fixit_hint
   ~fixit_replace ();
 
   enum kind get_kind () const { return REPLACE; }
-  bool affects_line_p (const char *file, int line);
+  bool affects_line_p (const char *file, int line) const;
   source_location get_start_loc () const { return m_src_range.m_start; }
   bool maybe_get_end_loc (source_location *out) const
   {

libcpp/line-map.c

@@ -2314,7 +2314,7 @@ fixit_insert::~fixit_insert ()
 /* Implementation of fixit_hint::affects_line_p for fixit_insert.  */
 
 bool
-fixit_insert::affects_line_p (const char *file, int line)
+fixit_insert::affects_line_p (const char *file, int line) const
 {
   expanded_location exploc
     = linemap_client_expand_location_to_spelling_point (m_where);
@@ -2351,7 +2351,7 @@ fixit_replace::~fixit_replace ()
 /* Implementation of fixit_hint::affects_line_p for fixit_replace.  */
 
 bool
-fixit_replace::affects_line_p (const char *file, int line)
+fixit_replace::affects_line_p (const char *file, int line) const
 {
   return m_src_range.intersects_line_p (file, line);
 }