Implement lookup of ops by mapped id in PackfileOpMap

src/pmc/packfileopmap.pmc

@@ -28,9 +28,9 @@ libraries that the ops come from.
 
 
 pmclass PackfileOpMap auto_attrs {
-    ATTR PMC    *op_maps;   /* RPA of Hashes of op lib maps */
-    ATTR PMC    *map_cache; /* Hash mapping full op names to numbers */
-    ATTR INTVAL  op_count;  /* number of mapped ops*/
+    ATTR PMC    *op_maps;       /* RPA of Hashes of op lib maps */
+    ATTR PMC    *map_cache;     /* Hash mapping full op names to numbers */
+    ATTR PMC    *ops;           /* RSA of mapped ops. */
 
 /*
 
@@ -51,7 +51,7 @@ Create empty PackfileOpMap for a given op library.
 
         attrs->op_maps    = Parrot_pmc_new(INTERP, enum_class_ResizablePMCArray);
         attrs->map_cache  = Parrot_pmc_new(INTERP, enum_class_Hash);
-        attrs->op_count   = 0;
+        attrs->ops        = Parrot_pmc_new(INTERP, enum_class_ResizableStringArray);
 
         core_ops_pmc = Parrot_pmc_new(INTERP, enum_class_String);
         VTABLE_set_string_native(INTERP, core_ops_pmc, CONST_STRING(INTERP, "core_ops"));
@@ -84,7 +84,7 @@ already in the map, a new map will be created.
 
     VTABLE INTVAL get_integer_keyed(PMC *key) {
         STRING *key_str, *oplib_str;
-        PMC    *map_cache, *op_maps;
+        PMC    *map_cache, *op_maps, *ops;
         INTVAL  op_map_count, i;
 
         GET_ATTR_map_cache(INTERP, SELF, map_cache);
@@ -118,13 +118,14 @@ already in the map, a new map will be created.
             table_ops = VTABLE_get_pmc_keyed_str(INTERP, op_map, table_ops_str);
             lib_ops   = VTABLE_get_pmc_keyed_str(INTERP, op_map, lib_ops_str);
 
-            GET_ATTR_op_count(INTERP, SELF, op_count);
+            GET_ATTR_ops(INTERP, SELF, ops);
+            op_count = VTABLE_elements(INTERP, ops);
 
             VTABLE_set_integer_keyed(INTERP, map_cache, key, op_count);
             VTABLE_push_integer(INTERP, table_ops, op_count);
             VTABLE_push_integer(INTERP, lib_ops, op_num);
 
-            SET_ATTR_op_count(INTERP, SELF, op_count + 1);
+            VTABLE_push_string(INTERP, ops, key_str);
 
             return op_count;
         }
@@ -173,6 +174,19 @@ Get Op PMC by name.
         return STATICSELF.get_pmc_keyed_str(Parrot_key_string(INTERP, key));
     }
 
+/*
+=item C<get_string_keyed_int()>
+
+Lookup op name by mapped id.
+
+=cut
+*/
+    VTABLE STRING* get_string_keyed_int(INTVAL key) {
+        PMC *ops;
+        GET_ATTR_ops(INTERP, SELF, ops);
+        return VTABLE_get_string_keyed_int(INTERP, ops, key);
+    }
+
 
 /*
 
@@ -186,10 +200,15 @@ Marks the object as live.
 
     VTABLE void mark() {
         PMC *tmp;
+
         GET_ATTR_op_maps(INTERP, SELF, tmp);
         Parrot_gc_mark_PMC_alive(INTERP, tmp);
+
         GET_ATTR_map_cache(INTERP, SELF, tmp);
         Parrot_gc_mark_PMC_alive(INTERP, tmp);
+
+        GET_ATTR_ops(INTERP, SELF, tmp);
+        Parrot_gc_mark_PMC_alive(INTERP, tmp);
     }
 
 
@@ -204,9 +223,9 @@ Get the number of filename mappings.
 */
 
     VTABLE INTVAL get_integer() {
-        INTVAL op_count;
-        GET_ATTR_op_count(INTERP, SELF, op_count);
-        return op_count;
+        PMC *ops;
+        GET_ATTR_ops(INTERP, SELF, ops);
+        return VTABLE_elements(INTERP, ops);
     }
 
 /*

t/pmc/packfileopmap.t

@@ -29,6 +29,8 @@ Tests the PackfileOpMap PMC.
     'sanity'()
     'basic'()
     'load_lib'()
+    'reverse_mapping'()
+
     'done_testing'()
 .end
 
@@ -125,6 +127,29 @@ Tests the PackfileOpMap PMC.
     .return ()
 .end
 
+.sub 'reverse_mapping'
+    .local pmc opmap
+    opmap = new ['PackfileOpMap']
+
+    # Map few ops.
+    $I0 = opmap['say_sc']
+    $I1 = opmap['returncc']
+    $I2 = opmap['issame_i_p_p']
+    $I3 = opmap['cmp_i_i_i']
+
+    $S0 = opmap[$I0]
+    is( $S0, "say_sc", "say_sc")
+
+    $S0 = opmap[$I1]
+    is( $S0, "returncc", "returncc")
+
+    $S0 = opmap[$I2]
+    is( $S0, "issame_i_p_p", "issame_i_p_p")
+
+    $S0 = opmap[$I3]
+    is( $S0, "cmp_i_i_i", "cmp_i_i_i")
+
+.end
 
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 #   mode: pir