Merge remote-tracking branch 'origin/master' into backport

1 files changed, 11 insertions, 4 deletions

diff --git a/filter/f-inst.h b/filter/f-inst.h
index df45f88e..e35f71c6 100644
--- a/filter/f-inst.h
+++ b/filter/f-inst.h
@@ -22,7 +22,7 @@
 
 /* Flags for instructions */
 enum f_instruction_flags {
-  FIF_PRINTED = 1,		/* FI_PRINT_AND_DIE: message put in buffer */
+  FIF_RECURSIVE = 1,		/* FI_CALL: function is directly recursive */
 } PACKED;
 
 /* Include generated filter instruction declarations */
@@ -35,19 +35,26 @@ const char *f_instruction_name_(enum f_instruction_code fi);
 static inline const char *f_instruction_name(enum f_instruction_code fi)
 { return f_instruction_name_(fi) + 3; }
 
+struct f_arg {
+  struct symbol *arg;
+  struct f_arg *next;
+};
+
 /* Filter structures for execution */
 /* Line of instructions to be unconditionally executed one after another */
 struct f_line {
   uint len;				/* Line length */
   u8 args;				/* Function: Args required */
   u8 vars;
+  u8 results;				/* Results left on stack: cmd -> 0, term -> 1 */
+  struct f_arg *arg_list;
   struct f_line_item items[0];		/* The items themselves */
 };
 
 /* Convert the f_inst infix tree to the f_line structures */
-struct f_line *f_linearize_concat(const struct f_inst * const inst[], uint count);
-static inline struct f_line *f_linearize(const struct f_inst *root)
-{ return f_linearize_concat(&root, 1); }
+struct f_line *f_linearize_concat(const struct f_inst * const inst[], uint count, uint results);
+static inline struct f_line *f_linearize(const struct f_inst *root, uint results)
+{ return f_linearize_concat(&root, 1, results); }
 
 void f_dump_line(const struct f_line *, uint indent);