Split class rtx_reader into md_reader vs rtx_reader

This moves read_rtx and friends into rtx_reader, and splits
rtx_reader into two classes:

class md_reader: has responsibility for reading chars, managing
include files, top-level directives etc.  It is the read-md.o part.

class rtx_reader, a subclass, has the code for reading hierarchical
rtx expressions using the format codes.   It is the read-rtl.o part.

This split is needed by a followup patch, which converts
read_rtx_operand to a virtual function of rtx_reader.  To do this,
instances of rtx_reader (or its subclasses) need a vtable, which
needs to include a ptr to the code in read-rtl.o.  Splitting it up
allows the gen* tools that currently purely use read-md.o to continue
to do so.

gcc/ChangeLog:
	* genpreds.c (write_tm_constrs_h): Update for renaming of
	rtx_reader_ptr to md_reader_ptr.
	(write_tm_preds_h): Likewise.
	(write_insn_preds_c): Likewise.
	* read-md.c (rtx_reader_ptr): Rename to...
	(md_reader_ptr): ...this, and convert from an
	rtx_reader * to a md_reader *.
	(rtx_reader::set_md_ptr_loc): Rename to...
	(md_reader::set_md_ptr_loc): ...this.
	(rtx_reader::get_md_ptr_loc): Rename to...
	(md_reader::get_md_ptr_loc): ...this.
	(rtx_reader::copy_md_ptr_loc): Rename to...
	(md_reader::copy_md_ptr_loc): ...this.
	(rtx_reader::fprint_md_ptr_loc): Rename to...
	(md_reader::fprint_md_ptr_loc): ...this.
	(rtx_reader::print_md_ptr_loc): Rename to...
	(md_reader::print_md_ptr_loc): ...this.
	(rtx_reader::join_c_conditions): Rename to...
	(md_reader::join_c_conditions): ...this.
	(rtx_reader::fprint_c_condition): ...this.
	(rtx_reader::print_c_condition): Rename to...
	(md_reader::print_c_condition): ...this.
	(fatal_with_file_and_line):  Update for renaming of
	rtx_reader_ptr to md_reader_ptr.
	(rtx_reader::require_char): Rename to...
	(md_reader::require_char): ...this.
	(rtx_reader::require_char_ws): Rename to...
	(md_reader::require_char_ws): ...this.
	(rtx_reader::require_word_ws): Rename to...
	(md_reader::require_word_ws): ...this.
	(rtx_reader::read_char): Rename to...
	(md_reader::read_char): ...this.
	(rtx_reader::unread_char): Rename to...
	(md_reader::unread_char): ...this.
	(rtx_reader::peek_char): Rename to...
	(md_reader::peek_char): ...this.
	(rtx_reader::read_name): Rename to...
	(md_reader::read_name): ...this.
	(rtx_reader::read_escape): Rename to...
	(md_reader::read_escape): ...this.
	(rtx_reader::read_quoted_string): Rename to...
	(md_reader::read_quoted_string): ...this.
	(rtx_reader::read_braced_string): Rename to...
	(md_reader::read_braced_string): ...this.
	(rtx_reader::read_string): Rename to...
	(md_reader::read_string): ...this.
	(rtx_reader::read_skip_construct): Rename to...
	(md_reader::read_skip_construct): ...this.
	(rtx_reader::handle_constants): Rename to...
	(md_reader::handle_constants): ...this.
	(rtx_reader::traverse_md_constants): Rename to...
	(md_reader::traverse_md_constants): ...this.
	(rtx_reader::handle_enum): Rename to...
	(md_reader::handle_enum): ...this.
	(rtx_reader::lookup_enum_type): Rename to...
	(md_reader::lookup_enum_type): ...this.
	(rtx_reader::traverse_enum_types): Rename to...
	(md_reader::traverse_enum_types): ...this.
	(rtx_reader::rtx_reader): Rename to...
	(md_reader::md_reader): ...this, and update for renaming of
	rtx_reader_ptr to md_reader_ptr.
	(rtx_reader::~rtx_reader): Rename to...
	(md_reader::~md_reader): ...this, and update for renaming of
	rtx_reader_ptr to md_reader_ptr.
	(rtx_reader::handle_include): Rename to...
	(md_reader::handle_include): ...this.
	(rtx_reader::handle_file): Rename to...
	(md_reader::handle_file): ...this.
	(rtx_reader::handle_toplevel_file): Rename to...
	(md_reader::handle_toplevel_file): ...this.
	(rtx_reader::get_current_location): Rename to...
	(md_reader::get_current_location): ...this.
	(rtx_reader::add_include_path): Rename to...
	(md_reader::add_include_path): ...this.
	(rtx_reader::read_md_files): Rename to...
	(md_reader::read_md_files): ...this.
	* read-md.h (class rtx_reader): Split into...
	(class md_reader): ...new class.
	(rtx_reader_ptr): Rename to...
	(md_reader_ptr): ...this, and convert to a md_reader *.
	(class noop_reader): Update base class to be md_reader.
	(class rtx_reader): Reintroduce as a subclass of md_reader.
	(rtx_reader_ptr): Reintroduce as a rtx_reader *.
	(read_char): Update for renaming of rtx_reader_ptr to
	md_reader_ptr.
	(unread_char): Likewise.
	* read-rtl.c (rtx_reader_ptr): New global.
	(rtx_reader::apply_iterator_to_string): Rename to...
	(md_reader::apply_iterator_to_string): ...this.
	(rtx_reader::copy_rtx_for_iterators): Rename to...
	(md_reader::copy_rtx_for_iterators): ...this.
	(rtx_reader::read_conditions): Rename to...
	(md_reader::read_conditions): ...this.
	(rtx_reader::record_potential_iterator_use): Rename to...
	(md_reader::record_potential_iterator_use): ...this.
	(rtx_reader::read_mapping): Rename to...
	(md_reader::read_mapping): ...this.
	(rtx_reader::read_rtx): Use rtx_reader_ptr when calling
	read_rtx_code.
	(rtx_reader::read_rtx_operand): Use get_string_obstack rather
	than directly accessing m_string_obstack.
	(rtx_reader::rtx_reader): New ctor.
	(rtx_reader::~rtx_reader): New dtor.

From-SVN: r243426

1 files changed, 32 insertions, 11 deletions

diff --git a/gcc/read-rtl.c b/gcc/read-rtl.c
index 7a2021a3a23..f74c8751a98 100644
--- a/gcc/read-rtl.c
+++ b/gcc/read-rtl.c
@@ -107,6 +107,9 @@ const char *current_iterator_name;
 
 static void validate_const_int (const char *);
 
+/* Global singleton.  */
+rtx_reader *rtx_reader_ptr = NULL;
+
 /* The mode and code iterator structures.  */
 static struct iterator_group modes, codes, ints, substs;
 
@@ -326,7 +329,7 @@ map_attr_string (const char *p)
    if any changes were needed, otherwise return STRING itself.  */
 
 const char *
-rtx_reader::apply_iterator_to_string (const char *string)
+md_reader::apply_iterator_to_string (const char *string)
 {
   char *base, *copy, *p, *start, *end;
   struct map_value *v;
@@ -365,7 +368,7 @@ rtx_reader::apply_iterator_to_string (const char *string)
    values into any strings.  */
 
 rtx
-rtx_reader::copy_rtx_for_iterators (rtx original)
+md_reader::copy_rtx_for_iterators (rtx original)
 {
   const char *format_ptr, *p;
   int i, j;
@@ -735,7 +738,7 @@ atoll (const char *p)
    slipped in at the beginning of the sequence of MD files read by
    most of the other generators.  */
 void
-rtx_reader::read_conditions ()
+md_reader::read_conditions ()
 {
   int c;
 
@@ -834,8 +837,8 @@ record_attribute_use (struct iterator_group *group, void *ptr,
    callback.  */
 
 void
-rtx_reader::record_potential_iterator_use (struct iterator_group *group,
-					   void *ptr, const char *name)
+md_reader::record_potential_iterator_use (struct iterator_group *group,
+					  void *ptr, const char *name)
 {
   struct mapping *m;
   size_t len;
@@ -869,7 +872,7 @@ rtx_reader::record_potential_iterator_use (struct iterator_group *group,
    (which belongs to GROUP) and return it.  */
 
 struct mapping *
-rtx_reader::read_mapping (struct iterator_group *group, htab_t table)
+md_reader::read_mapping (struct iterator_group *group, htab_t table)
 {
   struct md_name name;
   struct mapping *m;
@@ -1072,7 +1075,7 @@ rtx_reader::read_rtx (const char *rtx_name, vec<rtx> *rtxen)
       return true;
     }
 
-  apply_iterators (read_rtx_code (rtx_name), rtxen);
+  apply_iterators (rtx_reader_ptr->read_rtx_code (rtx_name), rtxen);
   iterator_uses.truncate (0);
   attribute_uses.truncate (0);
 
@@ -1270,6 +1273,7 @@ rtx_reader::read_rtx_operand (rtx return_rtx, int idx)
       {
 	char *stringbuf;
 	int star_if_braced;
+	struct obstack *string_obstack = get_string_obstack ();
 
 	c = read_skip_spaces ();
 	unread_char (c);
@@ -1306,11 +1310,11 @@ rtx_reader::read_rtx_operand (rtx return_rtx, int idx)
 	    for (slash = fn; *slash; slash ++)
 	      if (*slash == '/' || *slash == '\\' || *slash == ':')
 		fn = slash + 1;
-	    obstack_1grow (&m_string_obstack, '*');
-	    obstack_grow (&m_string_obstack, fn, strlen (fn));
+	    obstack_1grow (string_obstack, '*');
+	    obstack_grow (string_obstack, fn, strlen (fn));
 	    sprintf (line_name, ":%d", get_lineno ());
-	    obstack_grow (&m_string_obstack, line_name, strlen (line_name)+1);
-	    stringbuf = XOBFINISH (&m_string_obstack, char *);
+	    obstack_grow (string_obstack, line_name, strlen (line_name)+1);
+	    stringbuf = XOBFINISH (string_obstack, char *);
 	  }
 
 	/* Find attr-names in the string.  */
@@ -1447,3 +1451,20 @@ rtx_reader::read_rtx_variadic (rtx form)
   unread_char (c);
   return form;
 }
+
+/* Constructor for class rtx_reader.  */
+
+rtx_reader::rtx_reader ()
+: md_reader ()
+{
+  /* Set the global singleton pointer.  */
+  rtx_reader_ptr = this;
+}
+
+/* Destructor for class rtx_reader.  */
+
+rtx_reader::~rtx_reader ()
+{
+  /* Clear the global singleton pointer.  */
+  rtx_reader_ptr = NULL;
+}