Introduce pretty_printer::clone vfunc

This patch provides a way to clone a pretty_printer.

This is needed so that we can capture text in a label_text and make
layout decisions based on it, using the policy of global_dc's printer,
whilst within a call to diagnostic_show_locus.  We can't print with
the pretty_printer itself within a call to diagnostic_show_locus since
it has partly-buffered content.

gcc/c-family/ChangeLog:
	* c-pretty-print.c (c_pretty_printer::clone): New vfunc
	implementation.
	* c-pretty-print.h (c_pretty_printer::clone): New vfunc decl.

gcc/cp/ChangeLog:
	* cxx-pretty-print.c (cxx_pretty_printer::clone): New vfunc
	implementation.
	* cxx-pretty-print.h (cxx_pretty_printer::clone): New vfunc decl.
	* error.c (cxx_format_postprocessor::clone): New vfunc.

gcc/ChangeLog:
	* pretty-print.c (pretty_printer::pretty_printer): New copy-ctor.
	(pretty_printer::clone): New vfunc implementation.
	* pretty-print.h (format_postprocessor::clone): New pure vfunc
	decl.
	(pretty_printer::pretty_printer): New copy-ctor decl.
	(pretty_printer::clone): New vfunc decl.

From-SVN: r279244

1 files changed, 4 insertions, 0 deletions

diff --git a/gcc/pretty-print.h b/gcc/pretty-print.h
index c73fc30..493507d 100644
--- a/gcc/pretty-print.h
+++ b/gcc/pretty-print.h
@@ -192,6 +192,7 @@ class format_postprocessor
 {
  public:
   virtual ~format_postprocessor () {}
+  virtual format_postprocessor *clone() const = 0;
   virtual void handle (pretty_printer *) = 0;
 };
 
@@ -221,9 +222,12 @@ public:
   /* Default construct a pretty printer with specified
      maximum line length cut off limit.  */
   explicit pretty_printer (int = 0);
+  explicit pretty_printer (const pretty_printer &other);
 
   virtual ~pretty_printer ();
 
+  virtual pretty_printer *clone () const;
+
   /* Where we print external representation of ENTITY.  */
   output_buffer *buffer;