debug info through the lr parser

1 files changed, 4 insertions, 4 deletions

diff --git a/demos/generate-parser.c b/demos/generate-parser.c
index e0ec5f5..c9c71f3 100644
--- a/demos/generate-parser.c
+++ b/demos/generate-parser.c
@@ -170,14 +170,14 @@ int main(int argc, char **argv)
 
     for(size_t i = 0; i < total_productions; i++) {
         printf("#define A(n) (*(stack_head-%zu+n))\n", grammar[i].nRHS-1);
-        printf("stack_item __prod%zu_action(stack_item *stack_head)\n", i);
+        printf("void *__prod%zu_action(stack_item *r, stack_item *stack_head)\n", i);
         printf("{ stack_item v = {0};\n");
         puts(semantic_action_str[i]);
-        printf("return v; }\n");
+        printf("*r = v; return NULL; }\n");
         printf("#undef A\n");
     }
 
-    printf("typedef stack_item (*semantic_action_fn)(stack_item *stack_head);\n");
+    printf("typedef void *(*semantic_action_fn)(stack_item *, stack_item *);\n");
 
     printf("semantic_action_fn *semantic_actions = (semantic_action_fn[]){\n");
     for(size_t i = 0; i < total_productions; i++)
@@ -194,7 +194,7 @@ int main(int argc, char **argv)
     printf("#include \"parts/grammar.h\"\n");
     printf("#include \"parts/table.h\"\n");
     printf("typedef %s stack_item;\n", stack_item_type);
-    printf("typedef stack_item (*semantic_action_fn)(stack_item *stack_head);\n");
+    printf("typedef void *(*semantic_action_fn)(stack_item *, stack_item *);\n");
     printf("extern semantic_action_fn *semantic_actions;\n");
     printf("#endif\n");
     set_stdout(NULL);