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

gcc/ChangeLog

@@ -1,3 +1,12 @@
+2019-12-11  David Malcolm  <dmalcolm@redhat.com>
+
+	* 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.
+
 2019-12-11  David Malcolm  <dmalcolm@redhat.com>
 
 	* function-tests.c (selftest::make_fndecl): Make non-static.

gcc/c-family/ChangeLog

@@ -1,3 +1,9 @@
+2019-12-11  David Malcolm  <dmalcolm@redhat.com>
+
+	* c-pretty-print.c (c_pretty_printer::clone): New vfunc
+	implementation.
+	* c-pretty-print.h (c_pretty_printer::clone): New vfunc decl.
+
 2019-12-09  David Malcolm  <dmalcolm@redhat.com>
 
 	* c-format.c (range_label_for_format_type_mismatch::get_text):

gcc/c-family/c-pretty-print.c

@@ -2372,6 +2372,13 @@ c_pretty_printer::c_pretty_printer ()
   parameter_list            = pp_c_parameter_type_list;
 }
 
+/* c_pretty_printer's implementation of pretty_printer::clone vfunc.  */
+
+pretty_printer *
+c_pretty_printer::clone () const
+{
+  return new c_pretty_printer (*this);
+}
 
 /* Print the tree T in full, on file FILE.  */
 

gcc/c-family/c-pretty-print.h

@@ -51,6 +51,7 @@ class c_pretty_printer : public pretty_printer
 {
 public:
   c_pretty_printer ();
+  pretty_printer *clone () const OVERRIDE;
 
   // Format string, possibly translated.
   void translate_string (const char *);

gcc/cp/ChangeLog

@@ -1,3 +1,10 @@
+2019-12-11  David Malcolm  <dmalcolm@redhat.com>
+
+	* 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.
+
 2019-12-11  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/92869

gcc/cp/cxx-pretty-print.c

@@ -2968,3 +2968,11 @@ cxx_pretty_printer::cxx_pretty_printer ()
   type_specifier_seq = (pp_fun) pp_cxx_type_specifier_seq;
   parameter_list = (pp_fun) pp_cxx_parameter_declaration_clause;
 }
+
+/* cxx_pretty_printer's implementation of pretty_printer::clone vfunc.  */
+
+pretty_printer *
+cxx_pretty_printer::clone () const
+{
+  return new cxx_pretty_printer (*this);
+}

gcc/cp/cxx-pretty-print.h

@@ -34,6 +34,8 @@ class cxx_pretty_printer : public c_pretty_printer
 public:
   cxx_pretty_printer ();
 
+  pretty_printer *clone () const OVERRIDE;
+
   void constant (tree);
   void id_expression (tree);
   void primary_expression (tree);

gcc/cp/error.c

@@ -143,6 +143,11 @@ class cxx_format_postprocessor : public format_postprocessor
   : m_type_a (), m_type_b ()
   {}
 
+  format_postprocessor *clone() const FINAL OVERRIDE
+  {
+    return new cxx_format_postprocessor ();
+  }
+
   void handle (pretty_printer *pp) FINAL OVERRIDE;
 
   deferred_printed_type m_type_a;

gcc/pretty-print.c

@@ -1590,6 +1590,32 @@ pretty_printer::pretty_printer (int maximum_length)
   pp_set_prefix (this, NULL);
 }
 
+/* Copy constructor for pretty_printer.  */
+
+pretty_printer::pretty_printer (const pretty_printer &other)
+: buffer (new (XCNEW (output_buffer)) output_buffer ()),
+  prefix (),
+  padding (other.padding),
+  maximum_length (other.maximum_length),
+  indent_skip (other.indent_skip),
+  wrapping (other.wrapping),
+  format_decoder (other.format_decoder),
+  m_format_postprocessor (NULL),
+  emitted_prefix (other.emitted_prefix),
+  need_newline (other.need_newline),
+  translate_identifiers (other.translate_identifiers),
+  show_color (other.show_color),
+  show_urls (other.show_urls)
+{
+  pp_line_cutoff (this) = maximum_length;
+  /* By default, we emit prefixes once per message.  */
+  pp_prefixing_rule (this) = pp_prefixing_rule (&other);
+  pp_set_prefix (this, NULL);
+
+  if (other.m_format_postprocessor)
+    m_format_postprocessor = other.m_format_postprocessor->clone ();
+}
+
 pretty_printer::~pretty_printer ()
 {
   if (m_format_postprocessor)
@@ -1599,6 +1625,14 @@ pretty_printer::~pretty_printer ()
   free (prefix);
 }
 
+/* Base class implementation of pretty_printer::clone vfunc.  */
+
+pretty_printer *
+pretty_printer::clone () const
+{
+  return new pretty_printer (*this);
+}
+
 /* Append a string delimited by START and END to the output area of
    PRETTY-PRINTER.  No line wrapping is done.  However, if beginning a
    new line then emit PRETTY-PRINTER's prefix and skip any leading

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;