allow generateStructInfo to work at runtime with structMetadata

src/jsifier.js

@@ -840,6 +840,7 @@ function JSify(data, functionsOnly, givenFunctions, givenGlobalVariables) {
       if (RUNTIME_TYPE_INFO) {
         Types.cleanForRuntime();
         print('Runtime.typeInfo = ' + JSON.stringify(Types.types));
+        print('Runtime.structMetadata = ' + JSON.stringify(Types.structMetadata));
       }
       generated.forEach(function(item) { print(indentify(item.JS || '', 2)); });
       print(Functions.generateIndexing());

src/runtime.js

@@ -183,11 +183,11 @@ Runtime = {
     var type, alignment;
     if (typeName) {
       offset = offset || 0;
-      type = typeof Types === 'undefined' ? Runtime.typeInfo[typeName] : Types.types[typeName];
+      type = (typeof Types === 'undefined' ? Runtime.typeInfo : Types.types)[typeName];
       if (!type) return null;
-      if (!struct) struct = Types.structMetadata[typeName.replace(/.*\./, '')];
+      if (!struct) struct = (typeof Types === 'undefined' ? Runtime : Types).structMetadata[typeName.replace(/.*\./, '')];
       if (!struct) return null;
-      assert(type.fields.length === struct.length, 'Number of named fields must match the type for ' + typeName);
+      assert(type.fields.length === struct.length, 'Number of named fields must match the type for ' + typeName + '. Perhaps due to inheritance, which is not supported yet?');
       alignment = type.flatIndexes;
     } else {
       var type = { fields: struct.map(function(item) { return item[0] }) };

tests/runner.py

@@ -3164,6 +3164,8 @@ if 'benchmark' not in sys.argv:
 
         # Way 2: use CppHeaderParser
 
+        global RUNTIME_TYPE_INFO; RUNTIME_TYPE_INFO = 1
+
         header = '''
           #include <stdio.h>
 
@@ -3339,13 +3341,16 @@ Child2:9
               print('|' + Runtime.typeInfo.UserStruct.fields + '|' + Runtime.typeInfo.UserStruct.flatIndexes + '|');
               var t = Runtime.generateStructInfo(['x', { us: ['x', 'y', 'z'] }, 'y'], 'Encloser')
               print('|' + [t.x, t.us.x, t.us.y, t.us.z, t.y] + '|');
+              print('|' + JSON.stringify(Runtime.generateStructInfo(null, 'UserStruct')) + '|');
             } else {
               print('No type info.');
             }
           '''
         )
         open(filename, 'w').write(src)
-      self.do_test(src, '*ok:5*\n|i32,i8,i16|0,4,6|\n|0,4,8,10,12|', post_build=post)
+      self.do_test(src,
+                   '*ok:5*\n|i32,i8,i16|0,4,6|\n|0,4,8,10,12|\n|{"__size__":8,"x":0,"y":4,"z":6}|',
+                   post_build=post)
 
       # Make sure that without the setting, we don't spam the .js with the type info
       RUNTIME_TYPE_INFO = 0