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

gcc/ChangeLog

+2016-09-21  David Malcolm  <dmalcolm@redhat.com>
+
+	* 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.
+
 2016-09-21  Jason Merrill  <jason@redhat.com>
 
 	* input.h (from_macro_definition_at): New.

gcc/genconstants.c

@@ -79,7 +79,8 @@ main (int argc, const char **argv)
 {
   progname = "genconstants";
 
-  if (!read_md_files (argc, argv, NULL, NULL))
+  noop_reader reader;
+  if (!reader.read_md_files (argc, argv, NULL))
     return (FATAL_EXIT_CODE);
 
   /* Initializing the MD reader has the side effect of loading up

gcc/genenums.c

@@ -49,7 +49,8 @@ main (int argc, const char **argv)
 {
   progname = "genenums";
 
-  if (!read_md_files (argc, argv, NULL, NULL))
+  noop_reader reader;
+  if (!reader.read_md_files (argc, argv, NULL))
     return (FATAL_EXIT_CODE);
 
   puts ("/* Generated automatically by the program `genenums'");

gcc/genmddeps.c

@@ -47,7 +47,8 @@ main (int argc, const char **argv)
   progname = "genmddeps";
   include_callback = add_filedep;
 
-  if (!read_md_files (argc, argv, NULL, NULL))
+  noop_reader reader;
+  if (!reader.read_md_files (argc, argv, NULL))
     return FATAL_EXIT_CODE;
 
   *last = NULL;

gcc/genpreds.c

@@ -1204,7 +1204,8 @@ write_tm_constrs_h (void)
 
   printf ("\
 /* Generated automatically by the program '%s'\n\
-   from the machine description file '%s'.  */\n\n", progname, in_fname);
+   from the machine description file '%s'.  */\n\n", progname,
+	  rtx_reader_ptr->get_top_level_filename ());
 
   puts ("\
 #ifndef GCC_TM_CONSTRS_H\n\
@@ -1403,7 +1404,8 @@ write_tm_preds_h (void)
 
   printf ("\
 /* Generated automatically by the program '%s'\n\
-   from the machine description file '%s'.  */\n\n", progname, in_fname);
+   from the machine description file '%s'.  */\n\n", progname,
+	  rtx_reader_ptr->get_top_level_filename ());
 
   puts ("\
 #ifndef GCC_TM_PREDS_H\n\
@@ -1552,7 +1554,8 @@ write_insn_preds_c (void)
 
   printf ("\
 /* Generated automatically by the program '%s'\n\
-   from the machine description file '%s'.  */\n\n", progname, in_fname);
+   from the machine description file '%s'.  */\n\n", progname,
+	  rtx_reader_ptr->get_top_level_filename ());
 
   puts ("\
 #include \"config.h\"\n\

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);

gcc/gensupport.h

@@ -125,9 +125,9 @@ struct optab_pattern
 };
 
 extern rtx add_implicit_parallel (rtvec);
-extern bool init_rtx_reader_args_cb (int, const char **,
-				     bool (*)(const char *));
-extern bool init_rtx_reader_args (int, const char **);
+extern rtx_reader *init_rtx_reader_args_cb (int, const char **,
+					    bool (*)(const char *));
+extern rtx_reader *init_rtx_reader_args (int, const char **);
 extern bool read_md_rtx (md_rtx_info *);
 extern unsigned int get_num_insn_codes ();
 

gcc/read-md.h

@@ -90,16 +90,81 @@ struct enum_type {
   unsigned int num_values;
 };
 
-/* A callback that handles a single .md-file directive, up to but not
-   including the closing ')'.  It takes two arguments: the file position
-   at which the directive started, and the name of the directive.  The next
-   unread character is the optional space after the directive name.  */
-typedef void (*directive_handler_t) (file_location, const char *);
-
-extern const char *in_fname;
-extern FILE *read_md_file;
-extern int read_md_lineno;
-extern const char *read_md_filename;
+class rtx_reader
+{
+ public:
+  rtx_reader ();
+  virtual ~rtx_reader ();
+
+  bool read_md_files (int, const char **, bool (*) (const char *));
+
+  /* A hook that handles a single .md-file directive, up to but not
+     including the closing ')'.  It takes two arguments: the file position
+     at which the directive started, and the name of the directive.  The next
+     unread character is the optional space after the directive name.  */
+  virtual void handle_unknown_directive (file_location, const char *) = 0;
+
+  file_location get_current_location () const;
+
+  int read_char (void);
+  void unread_char (int ch);
+
+  const char *get_top_level_filename () const { return m_toplevel_fname; }
+  const char *get_filename () const { return m_read_md_filename; }
+  int get_lineno () const { return m_read_md_lineno; }
+
+ private:
+  /* A singly-linked list of filenames.  */
+  struct file_name_list {
+    struct file_name_list *next;
+    const char *fname;
+  };
+
+ private:
+  void handle_file ();
+  void handle_toplevel_file ();
+  void handle_include (file_location loc);
+  void add_include_path (const char *arg);
+
+ private:
+  /* The name of the toplevel file that indirectly included
+     m_read_md_file.  */
+  const char *m_toplevel_fname;
+
+  /* The directory part of m_toplevel_fname
+     NULL if m_toplevel_fname is a bare filename.  */
+  char *m_base_dir;
+
+  /* The file we are reading.  */
+  FILE *m_read_md_file;
+
+  /* The filename of m_read_md_file.  */
+  const char *m_read_md_filename;
+
+  /* The current line number in m_read_md_file.  */
+  int m_read_md_lineno;
+
+  /* The first directory to search.  */
+  file_name_list *m_first_dir_md_include;
+
+  /* A pointer to the null terminator of the md include chain.  */
+  file_name_list **m_last_dir_md_include_ptr;
+};
+
+/* Global singleton.  */
+extern rtx_reader *rtx_reader_ptr;
+
+/* An rtx_reader subclass which skips unknown directives.  */
+
+class noop_reader : public rtx_reader
+{
+ public:
+  noop_reader () : rtx_reader () {}
+
+  /* A dummy implementation which skips unknown directives.  */
+  void handle_unknown_directive (file_location, const char *);
+};
+
 extern struct obstack string_obstack;
 extern void (*include_callback) (const char *);
 
@@ -108,12 +173,7 @@ extern void (*include_callback) (const char *);
 static inline int
 read_char (void)
 {
-  int ch;
-
-  ch = getc (read_md_file);
-  if (ch == '\n')
-    read_md_lineno++;
-  return ch;
+  return rtx_reader_ptr->read_char ();
 }
 
 /* Put back CH, which was the last character read from the MD file.  */
@@ -121,9 +181,7 @@ read_char (void)
 static inline void
 unread_char (int ch)
 {
-  if (ch == '\n')
-    read_md_lineno--;
-  ungetc (ch, read_md_file);
+  rtx_reader_ptr->unread_char (ch);
 }
 
 extern hashval_t leading_string_hash (const void *);
@@ -151,7 +209,5 @@ extern void upcase_string (char *);
 extern void traverse_md_constants (htab_trav, void *);
 extern void traverse_enum_types (htab_trav, void *);
 extern struct enum_type *lookup_enum_type (const char *);
-extern bool read_md_files (int, const char **, bool (*) (const char *),
-			   directive_handler_t);
 
 #endif /* GCC_READ_MD_H */

gcc/read-rtl.c

@@ -1234,6 +1234,7 @@ read_rtx_code (const char *code_name)
 		  || GET_CODE (return_rtx) == DEFINE_INSN_AND_SPLIT))
 	    {
 	      char line_name[20];
+	      const char *read_md_filename = rtx_reader_ptr->get_filename ();
 	      const char *fn = (read_md_filename ? read_md_filename : "rtx");
 	      const char *slash;
 	      for (slash = fn; *slash; slash ++)
@@ -1241,7 +1242,7 @@ read_rtx_code (const char *code_name)
 		  fn = slash + 1;
 	      obstack_1grow (&string_obstack, '*');
 	      obstack_grow (&string_obstack, fn, strlen (fn));
-	      sprintf (line_name, ":%d", read_md_lineno);
+	      sprintf (line_name, ":%d", rtx_reader_ptr->get_lineno ());
 	      obstack_grow (&string_obstack, line_name, strlen (line_name)+1);
 	      stringbuf = XOBFINISH (&string_obstack, char *);
 	    }