Change internalmode to be an intrinsic variable

Currently, internalmode is a special word to set an internal state
variable.  Because this series adds variables anyway, change this to
be a variable instead.

I saw some commits in the history that made sure that chew did not
leak memory, so I put some extra effort into trying to handle this for
variables as well.

2023-02-07  Tom Tromey  <tom@tromey.com>

	* doc/proto.str (external, internal, ifinternal, ENUMEQ, ENUMDOC):
	Update.
	* doc/chew.c (internalmode): Remove.
	(add_intrinsic_variable): New function.
	(main): Add internalmode as intrinsic.
	(internal_mode): Remove global.
	(maybecatstr): Update.
	(free_words): Free variables.

3 files changed, 50 insertions, 19 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 72c70e6..6e8888d 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,5 +1,16 @@
 2023-02-07  Tom Tromey  <tom@tromey.com>
 
+	* doc/proto.str (external, internal, ifinternal, ENUMEQ, ENUMDOC):
+	Update.
+	* doc/chew.c (internalmode): Remove.
+	(add_intrinsic_variable): New function.
+	(main): Add internalmode as intrinsic.
+	(internal_mode): Remove global.
+	(maybecatstr): Update.
+	(free_words): Free variables.
+
+2023-02-07  Tom Tromey  <tom@tromey.com>
+
 	* doc/chew.c (pcu) <l>: Now intptr_t.
 	(internal_mode, istack, isp): Likewise.
 	(bang, atsign): Use intptr_t.
diff --git a/bfd/doc/chew.c b/bfd/doc/chew.c
index 510a8e9..b17b20a1 100644
--- a/bfd/doc/chew.c
+++ b/bfd/doc/chew.c
@@ -70,12 +70,13 @@
 	translatecomments - turn {* and *} into comment delimiters
 	kill_bogus_lines - get rid of extra newlines
 	indent
-	internalmode - pop from integer stack, set `internalmode' to that value
 	print_stack_level - print current stack depth to stderr
 	strip_trailing_newlines - go ahead, guess...
 	[quoted string] - push string onto string stack
 	[word starting with digit] - push atol(str) onto integer stack
 
+	internalmode - the internalmode variable (evaluates to address)
+
    A command must be all upper-case, and alone on a line.
 
    Foo.  */
@@ -119,7 +120,7 @@ typedef struct dict_struct
 } dict_type;
 
 int internal_wanted;
-intptr_t internal_mode;
+intptr_t *internal_mode;
 
 int warning;
 
@@ -376,6 +377,14 @@ push_number (void)
   pc++;
 }
 
+/* This is a wrapper for push_number just so we can correctly free the
+   variable at the end.  */
+static void
+push_variable (void)
+{
+  push_number ();
+}
+
 static void
 push_text (void)
 {
@@ -994,18 +1003,9 @@ skip_past_newline (void)
 }
 
 static void
-internalmode (void)
-{
-  internal_mode = *(isp);
-  isp--;
-  icheck_range ();
-  pc++;
-}
-
-static void
 maybecatstr (void)
 {
-  if (internal_wanted == internal_mode)
+  if (internal_wanted == *internal_mode)
     {
       catstr (tos - 1, tos);
     }
@@ -1138,6 +1138,11 @@ free_words (void)
 		free (ptr->code[i + 1].s - 1);
 		++i;
 	      }
+	    else if (ptr->code[i].f == push_variable)
+	      {
+		free ((void *) ptr->code[i + 1].l);
+		++i;
+	      }
 	  free (ptr->code);
 	}
       next = ptr->next;
@@ -1217,6 +1222,18 @@ add_intrinsic (char *name, void (*func) (void))
   add_to_definition (new_d, p);
 }
 
+static void
+add_intrinsic_variable (char *name, intptr_t *loc)
+{
+  dict_type *new_d = newentry (xstrdup (name));
+  pcu p = { push_variable };
+  add_to_definition (new_d, p);
+  p.l = (intptr_t) loc;
+  add_to_definition (new_d, p);
+  p.f = 0;
+  add_to_definition (new_d, p);
+}
+
 void
 compile (char *string)
 {
@@ -1430,10 +1447,13 @@ main (int ac, char *av[])
   add_intrinsic ("translatecomments", translatecomments);
   add_intrinsic ("kill_bogus_lines", kill_bogus_lines);
   add_intrinsic ("indent", indent);
-  add_intrinsic ("internalmode", internalmode);
   add_intrinsic ("print_stack_level", print_stack_level);
   add_intrinsic ("strip_trailing_newlines", strip_trailing_newlines);
 
+  internal_mode = xmalloc (sizeof (intptr_t));
+  *internal_mode = 0;
+  add_intrinsic_variable ("internalmode", internal_mode);
+
   /* Put a nl at the start.  */
   catchar (&buffer, '\n');
 
diff --git a/bfd/doc/proto.str b/bfd/doc/proto.str
index 7bebbc2..5206f7f 100644
--- a/bfd/doc/proto.str
+++ b/bfd/doc/proto.str
@@ -34,16 +34,16 @@
 	ignore ;
 
 : external
-	0 internalmode ignore ;
+	0 internalmode ! ignore ;
 
 : internal 
-	1 internalmode ignore ;
+	1 internalmode ! ignore ;
 
 - input stack { a b } output b if internal, a if external
 : ifinternal
-	"" swap 1 internalmode maybecatstr
+	"" swap 1 internalmode ! maybecatstr
 	swap
-	"" swap 0 internalmode maybecatstr
+	"" swap 0 internalmode ! maybecatstr
 	catstr
 	;
 
@@ -123,7 +123,7 @@
 	catstr
 	copy_past_newline
 	catstr
-	"" swap 0 internalmode maybecatstr
+	"" swap 0 internalmode ! maybecatstr
 	;
 : ENUMEQX ENUMEQ catstr ;
 : ENUMDOC
@@ -133,7 +133,7 @@
 	"\n{* " swap catstr "  *}\n" catstr
 	translatecomments
 	- discard it if we're doing internal mode
-	"" swap 0 internalmode maybecatstr
+	"" swap 0 internalmode ! maybecatstr
 	swap
 	catstr catstr
 	;