Introduce class rtx_reader

Bundle up various global variables within gensupport.c into a
class rtx_reader, with a view towards making it easier to run the
code more than once in-process.

gcc/ChangeLog:
	* genconstants.c (main): Introduce noop_reader and convert call
	to read_md_files to a method call.
	* genenums.c (main): Likewise.
	* genmddeps.c (main): Likewise.
	* genpreds.c (write_tm_constrs_h): Replace use of "in_fname" with
	rtx_reader_ptr->get_top_level_filename ().
	(write_tm_preds_h): Likewise.
	(write_insn_preds_c): Likewise.
	* gensupport.c (class gen_reader): New subclass of rtx_reader.
	(rtx_handle_directive): Convert to...
	(gen_reader::handle_unknown_directive): ...this.
	(init_rtx_reader_args_cb): Convert return type from bool to
	rtx_reader *.  Create a gen_reader instance, using it for the
	call to read_md_files.  Return it if no errors occur.
	(init_rtx_reader_args): Convert return type from bool to
	rtx_reader *.
	* gensupport.h (init_rtx_reader_args_cb): Likewise.
	(init_rtx_reader_args_cb): Likewise.
	* read-md.c (struct file_name_list): Move to class rtx_reader.
	(read_md_file): Delete in favor of rtx_reader::m_read_md_file.
	(read_md_filename): Delete in favor of
	rtx_reader::m_read_md_filename.
	(read_md_lineno): Delete in favor of rtx_reader::m_read_md_lineno.
	(in_fname): Delete in favor of rtx_reader::m_toplevel_fname.
	(base_dir): Delete in favor of rtx_reader::m_base_dir.
	(first_dir_md_include): Delete in favor of
	rtx_reader::m_first_dir_md_include.
	(last_dir_md_include_ptr): Delete in favor of
	rtx_reader::m_last_dir_md_include_ptr.
	(max_include_len): Delete.
	(rtx_reader_ptr): New.
	(fatal_with_file_and_line): Use get_filename and get_lineno
	accessors of rtx_reader_ptr.
	(require_char_ws): Likewise.
	(rtx_reader::read_char): New method, based on ::read_char.
	(rtx_reader::unread_char): New method, based on ::unread_char.
	(read_escape): Use get_filename and get_lineno accessors of
	rtx_reader_ptr.
	(read_braced_string): Use get_lineno accessor of rtx_reader_ptr.
	(read_string): Use get_filename and get_lineno accessors of
	rtx_reader_ptr.
	(rtx_reader::rtx_reader): New ctor.
	(rtx_reader::~rtx_reader): New dtor.
	(handle_include): Convert from a function to...
	(rtx_reader::handle_include): ...this method, converting
	handle_directive from a callback to a virtual function.
	(handle_file): Likewise, converting to...
	(rtx_reader::handle_file): ...this method.
	(handle_toplevel_file): Likewise, converting to...
	(rtx_reader::handle_toplevel_file): ...this method.
	(rtx_reader::get_current_location): New method.
	(parse_include): Convert from a function to...
	(rtx_reader::add_include_path): ...this method, dropping redundant
	update to unused max_include_len.
	(read_md_files): Convert from a function to...
	(rtx_reader::read_md_files): ...this method, converting
	handle_directive from a callback to a virtual function.
	(noop_reader::handle_unknown_directive): New method.
	* read-md.h (directive_handler_t): Delete this typedef.
	(in_fname): Delete.
	(read_md_file): Delete.
	(read_md_lineno): Delete.
	(read_md_filename): Delete.
	(class rtx_reader): New class.
	(rtx_reader_ptr): New decl.
	(class noop_reader): New subclass of rtx_reader.
	(read_char): Reimplement in terms of rtx_reader::read_char.
	(unread_char): Reimplement in terms of rtx_reader::unread_char.
	(read_md_files): Delete.
	* read-rtl.c (read_rtx_code): Update for deletion of globals
	read_md_filename and read_md_lineno.

From-SVN: r240333

1 files changed, 22 insertions, 7 deletions

diff --git a/gcc/gensupport.c b/gcc/gensupport.c
index 4645ead..1648c9c 100644
--- a/gcc/gensupport.c
+++ b/gcc/gensupport.c
@@ -2225,10 +2225,18 @@ process_define_subst (void)
     }
 }
 
-/* A read_md_files callback for reading an rtx.  */
+/* A subclass of rtx_reader which reads .md files and calls process_rtx on
+   the top-level elements.  */
 
-static void
-rtx_handle_directive (file_location loc, const char *rtx_name)
+class gen_reader : public rtx_reader
+{
+ public:
+  gen_reader () : rtx_reader () {}
+  void handle_unknown_directive (file_location, const char *);
+};
+
+void
+gen_reader::handle_unknown_directive (file_location loc, const char *rtx_name)
 {
   auto_vec<rtx, 32> subrtxs;
   if (!read_rtx (rtx_name, &subrtxs))
@@ -2499,7 +2507,7 @@ check_define_attr_duplicates ()
 
 /* The entry point for initializing the reader.  */
 
-bool
+rtx_reader *
 init_rtx_reader_args_cb (int argc, const char **argv,
 			 bool (*parse_opt) (const char *))
 {
@@ -2515,7 +2523,8 @@ init_rtx_reader_args_cb (int argc, const char **argv,
   split_sequence_num = 1;
   peephole2_sequence_num = 1;
 
-  read_md_files (argc, argv, parse_opt, rtx_handle_directive);
+  gen_reader *reader = new gen_reader ();
+  reader->read_md_files (argc, argv, parse_opt);
 
   if (define_attr_queue != NULL)
     check_define_attr_duplicates ();
@@ -2531,12 +2540,18 @@ init_rtx_reader_args_cb (int argc, const char **argv,
   if (define_attr_queue != NULL)
     gen_mnemonic_attr ();
 
-  return !have_error;
+  if (have_error)
+    {
+      delete reader;
+      return NULL;
+    }
+
+  return reader;
 }
 
 /* Programs that don't have their own options can use this entry point
    instead.  */
-bool
+rtx_reader *
 init_rtx_reader_args (int argc, const char **argv)
 {
   return init_rtx_reader_args_cb (argc, argv, 0);