Compiler [Typechecker]: Added PIKE_T_OPERATOR.

Added generic support for 127 + 127 type operator functions.

This reduces the amount of special cases needed to implement
type operators (like eg find_lfun() or zzap_return()).

Needed for #10048.

src/pike_types.h

@@ -392,6 +392,7 @@ PMOD_EXPORT void set_program_id_to_id( int (*to)(int) );
 #define push_scope_type(LEVEL) do { debug_push_scope_type(LEVEL);debug_malloc_pass(debug_peek_type_stack()); } while(0)
 #define push_type_attribute(ATTR) do { debug_push_type_attribute((struct pike_string *)debug_malloc_pass(ATTR));debug_malloc_pass(debug_peek_type_stack()); } while(0)
 #define push_type_name(NAME) do { debug_push_type_name((struct pike_string *)debug_malloc_pass(NAME));debug_malloc_pass(debug_peek_type_stack()); } while(0)
+#define push_type_operator(OP, ARG) do { debug_push_type_operator(OP, (struct pike_type *)debug_malloc_pass(ARG));debug_malloc_pass(debug_peek_type_stack()); } while(0)
 #define push_unfinished_type(S) ERROR
 #define push_assign_type(MARKER) do { debug_push_assign_type(MARKER);debug_malloc_pass(debug_peek_type_stack()); } while(0)
 #define push_finished_type(T) do { debug_push_finished_type((struct pike_type *)debug_malloc_pass(T));debug_malloc_pass(debug_peek_type_stack()); } while(0)
@@ -411,6 +412,7 @@ PMOD_EXPORT void set_program_id_to_id( int (*to)(int) );
 #define push_scope_type debug_push_scope_type
 #define push_type_attribute debug_push_type_attribute
 #define push_type_name debug_push_type_name
+#define push_type_operator debug_push_type_operator
 #define push_unfinished_type debug_push_unfinished_type
 #define push_assign_type debug_push_assign_type
 #define push_finished_type debug_push_finished_type

src/svalue.h

@@ -141,6 +141,17 @@ enum PIKE_TYPE {
     PIKE_T_VAR_8 = '8',
     PIKE_T_VAR_9 = '9',		/* 57 */
 
+    /* Operators. These all have 0x80 in the low 8 bits, and
+     * a non-zero function number in the next 8 bits.
+     *
+     * Bit 15 (0x8000) indicates that cdr is a type-node.
+     *
+     * Note that this overlaps with the PIKE_T_NO_REF_FLAG,
+     * but that should be safe, as operators aren't valid
+     * run-time types.
+     */
+    PIKE_T_OPERATOR = 0x0080,
+
 /*
  * The following types are only used in compile-time types and
  * as markers in struct identifier.