[2/5] Add range_idx param to range_label::get_text

diff --git a/gcc/c-family/c-format.c b/gcc/c-family/c-format.c
index a7edfca..a1133c7 100644
--- a/gcc/c-family/c-format.c
+++ b/gcc/c-family/c-format.c
@@ -3597,9 +3597,9 @@  class range_label_for_format_type_mismatch
   {
   }
 
-  label_text get_text () const FINAL OVERRIDE
+  label_text get_text (unsigned range_idx) const FINAL OVERRIDE
   {
-    label_text text = range_label_for_type_mismatch::get_text ();
+    label_text text = range_label_for_type_mismatch::get_text (range_idx);
     if (text.m_buffer == NULL)
       return text;
 
diff --git a/gcc/c/c-objc-common.c b/gcc/c/c-objc-common.c
index 12e777a..fee5268 100644
--- a/gcc/c/c-objc-common.c
+++ b/gcc/c/c-objc-common.c
@@ -218,7 +218,7 @@  c_tree_printer (pretty_printer *pp, text_info *text, const char *spec,
    range_label_for_type_mismatch.  */
 
 label_text
-range_label_for_type_mismatch::get_text () const
+range_label_for_type_mismatch::get_text (unsigned /*range_idx*/) const
 {
   if (m_labelled_type == NULL_TREE)
     return label_text (NULL, false);
diff --git a/gcc/c/c-typeck.c b/gcc/c/c-typeck.c
index 5f8df12..5388ddb 100644
--- a/gcc/c/c-typeck.c
+++ b/gcc/c/c-typeck.c
@@ -11049,7 +11049,7 @@  class maybe_range_label_for_tree_type_mismatch : public range_label
   {
   }
 
-  label_text get_text () const FINAL OVERRIDE
+  label_text get_text (unsigned range_idx) const FINAL OVERRIDE
   {
     if (m_expr == NULL_TREE
 	|| !EXPR_P (m_expr))
@@ -11061,7 +11061,7 @@  class maybe_range_label_for_tree_type_mismatch : public range_label
       other_type = TREE_TYPE (m_other_expr);
 
    range_label_for_type_mismatch inner (expr_type, other_type);
-   return inner.get_text ();
+   return inner.get_text (range_idx);
   }
 
  private:
diff --git a/gcc/cp/error.c b/gcc/cp/error.c
index 5bab3f3..601f6d2 100644
--- a/gcc/cp/error.c
+++ b/gcc/cp/error.c
@@ -4289,7 +4289,7 @@  qualified_name_lookup_error (tree scope, tree name,
    Compare with print_template_differences above.  */
 
 label_text
-range_label_for_type_mismatch::get_text () const
+range_label_for_type_mismatch::get_text (unsigned /*range_idx*/) const
 {
   if (m_labelled_type == NULL_TREE)
     return label_text (NULL, false);
diff --git a/gcc/diagnostic-show-locus.c b/gcc/diagnostic-show-locus.c
index 6ce8a0f..7dfb0a0 100644
--- a/gcc/diagnostic-show-locus.c
+++ b/gcc/diagnostic-show-locus.c
@@ -128,6 +128,7 @@  class layout_range
 		const expanded_location *finish_exploc,
 		enum range_display_kind range_display_kind,
 		const expanded_location *caret_exploc,
+		unsigned original_idx,
 		const range_label *label);
 
   bool contains_point (linenum_type row, int column) const;
@@ -137,6 +138,7 @@  class layout_range
   layout_point m_finish;
   enum range_display_kind m_range_display_kind;
   layout_point m_caret;
+  unsigned m_original_idx;
   const range_label *m_label;
 };
 
@@ -236,6 +238,7 @@  class layout
 	  diagnostic_t diagnostic_kind);
 
   bool maybe_add_location_range (const location_range *loc_range,
+				 unsigned original_idx,
 				 bool restrict_to_current_line_spans);
 
   int get_num_line_spans () const { return m_line_spans.length (); }
@@ -414,11 +417,13 @@  layout_range::layout_range (const expanded_location *start_exploc,
 			    const expanded_location *finish_exploc,
 			    enum range_display_kind range_display_kind,
 			    const expanded_location *caret_exploc,
+			    unsigned original_idx,
 			    const range_label *label)
 : m_start (*start_exploc),
   m_finish (*finish_exploc),
   m_range_display_kind (range_display_kind),
   m_caret (*caret_exploc),
+  m_original_idx (original_idx),
   m_label (label)
 {
 }
@@ -546,7 +551,7 @@  make_range (int start_line, int start_col, int end_line, int end_col)
   const expanded_location finish_exploc
     = {"test.c", end_line, end_col, NULL, false};
   return layout_range (&start_exploc, &finish_exploc, SHOW_RANGE_WITHOUT_CARET,
-		       &start_exploc, NULL);
+		       &start_exploc, 0, NULL);
 }
 
 /* Selftests for layout_range::contains_point and
@@ -899,7 +904,7 @@  layout::layout (diagnostic_context * context,
       /* This diagnostic printer can only cope with "sufficiently sane" ranges.
 	 Ignore any ranges that are awkward to handle.  */
       const location_range *loc_range = richloc->get_range (idx);
-      maybe_add_location_range (loc_range, false);
+      maybe_add_location_range (loc_range, idx, false);
     }
 
   /* Populate m_fixit_hints, filtering to only those that are in the
@@ -953,6 +958,9 @@  layout::layout (diagnostic_context * context,
 /* Attempt to add LOC_RANGE to m_layout_ranges, filtering them to
    those that we can sanely print.
 
+   ORIGINAL_IDX is the index of LOC_RANGE within its rich_location,
+   (for use as extrinsic state by label ranges FIXME).
+
    If RESTRICT_TO_CURRENT_LINE_SPANS is true, then LOC_RANGE is also
    filtered against this layout instance's current line spans: it
    will only be added if the location is fully within the lines
@@ -962,6 +970,7 @@  layout::layout (diagnostic_context * context,
 
 bool
 layout::maybe_add_location_range (const location_range *loc_range,
+				  unsigned original_idx,
 				  bool restrict_to_current_line_spans)
 {
   gcc_assert (loc_range);
@@ -1001,7 +1010,7 @@  layout::maybe_add_location_range (const location_range *loc_range,
   /* Everything is now known to be in the correct source file,
      but it may require further sanitization.  */
   layout_range ri (&start, &finish, loc_range->m_range_display_kind, &caret,
-		   loc_range->m_label);
+		   original_idx, loc_range->m_label);
 
   /* If we have a range that finishes before it starts (perhaps
      from something built via macro expansion), printing the
@@ -1488,7 +1497,7 @@  layout::print_any_labels (linenum_type row)
 	  continue;
 
 	label_text text;
-	text = range->m_label->get_text ();
+	text = range->m_label->get_text (range->m_original_idx);
 
 	/* Allow for labels that return NULL from their get_text
 	   implementation (so e.g. such labels can control their own
@@ -2277,7 +2286,7 @@  gcc_rich_location::add_location_if_nearby (location_t loc)
   location_range loc_range;
   loc_range.m_loc = loc;
   loc_range.m_range_display_kind = SHOW_RANGE_WITHOUT_CARET;
-  if (!layout.maybe_add_location_range (&loc_range, true))
+  if (!layout.maybe_add_location_range (&loc_range, 0, true))
     return false;
 
   add_range (loc);
diff --git a/gcc/gcc-rich-location.h b/gcc/gcc-rich-location.h
index dc11ee8..e55dd76 100644
--- a/gcc/gcc-rich-location.h
+++ b/gcc/gcc-rich-location.h
@@ -109,7 +109,7 @@  class text_range_label : public range_label
  public:
   text_range_label (const char *text) : m_text (text) {}
 
-  label_text get_text () const FINAL OVERRIDE
+  label_text get_text (unsigned /*range_idx*/) const FINAL OVERRIDE
   {
     return label_text (const_cast <char *> (m_text), false);
   }
@@ -155,7 +155,7 @@  class range_label_for_type_mismatch : public range_label
   {
   }
 
-  label_text get_text () const OVERRIDE;
+  label_text get_text (unsigned range_idx) const OVERRIDE;
 
  protected:
   tree m_labelled_type;
diff --git a/libcpp/include/line-map.h b/libcpp/include/line-map.h
index fd06758..c479dfa 100644
--- a/libcpp/include/line-map.h
+++ b/libcpp/include/line-map.h
@@ -1808,8 +1808,10 @@  class range_label
  public:
   virtual ~range_label () {}
 
-  /* Get localized text for the label.  */
-  virtual label_text get_text () const = 0;
+  /* Get localized text for the label.
+     The RANGE_IDX is provided, allowing for range_label instances to be
+     shared by multiple ranges if need be (the "flyweight" design pattern).  */
+  virtual label_text get_text (unsigned range_idx) const = 0;
 };
 
 /* A fix-it hint: a suggested insertion, replacement, or deletion of text.