now variables can access the global scope

src/main.c

@@ -233,7 +233,7 @@ int main(int argc, char **argv)
 
 					Runtime_SetBuiltins(runtime, builtins);
 
-					Object *result = run(runtime, (Error*) &error, exe, 0, NULL, 0);
+					Object *result = run(runtime, (Error*) &error, exe, 0, NULL, 1, NULL, 0);
 
 					if(result == NULL)
 						{

src/runtime/o_func.c

@@ -9,6 +9,7 @@ typedef struct {
 	Runtime *runtime;
 	Executable *exe;
 	int index, argc;
+	Object *globals;
 } FunctionObject;
 
 static Object *call(Object *self, Object **argv, unsigned int argc, Heap *heap, Error *error);
@@ -73,7 +74,7 @@ static Object *call(Object *self, Object **argv, unsigned int argc, Heap *heap,
 		// The right amount of arguments was provided.
 		argv2 = argv;
 
-	Object *result = run(func->runtime, error, func->exe, func->index, argv2, expected_argc);
+	Object *result = run(func->runtime, error, func->exe, func->index, func->globals, 0, argv2, expected_argc);
 
 	if(argv2 != argv)
 		free(argv2);
@@ -81,7 +82,7 @@ static Object *call(Object *self, Object **argv, unsigned int argc, Heap *heap,
 	return result;
 }
 
-Object *Object_FromNojaFunction(Runtime *runtime, Executable *exe, int index, int argc, Heap *heap, Error *error)
+Object *Object_FromNojaFunction(Runtime *runtime, Executable *exe, int index, int argc, Object *globals, Heap *heap, Error *error)
 {
 	assert(runtime != NULL);
 	assert(exe != NULL);
@@ -107,6 +108,7 @@ Object *Object_FromNojaFunction(Runtime *runtime, Executable *exe, int index, in
 	func->exe = exe_copy;
 	func->index = index;
 	func->argc = argc;
+	func->globals = globals;
 
 	return (Object*) func;
 }

src/runtime/runtime.c

@@ -10,7 +10,8 @@ typedef struct Frame Frame;
 
 struct Frame {
 	Frame  *prev;
-	Object *vars;
+	Object *locals;
+	Object *globals;
 	Executable *exe;
 	int index, used;
 };
@@ -645,7 +646,7 @@ static _Bool step(Runtime *runtime, Error *error)
 				if(key == NULL)
 					return 0;
 				
-				if(!Object_Insert(runtime->frame->vars, key, val, runtime->heap, error))
+				if(!Object_Insert(runtime->frame->locals, key, val, runtime->heap, error))
 					return 0;
 				return 1;
 			}
@@ -835,28 +836,29 @@ static _Bool step(Runtime *runtime, Error *error)
 				if(key == NULL)
 					return 0;
 
-				Object *obj = Object_Select(runtime->frame->vars, key, runtime->heap, error);
+				Object *locations[] = {
+					runtime->frame->locals,
+					runtime->frame->globals,
+					Runtime_GetBuiltins(runtime),
+				};
+				
+				Object *obj = NULL;
 
-				if(obj == NULL && error->occurred == 0)
+				for(int p = 0; obj == NULL && (unsigned int) p < sizeof(locations)/sizeof(locations[0]); p += 1)
 					{
-						// Variable not defined locally.
+						if(locations[p] == NULL)
+							continue;
 
-						Object *builtins = Runtime_GetBuiltins(runtime);
-
-						if(builtins != NULL)
-							obj = Object_Select(builtins, key, runtime->heap, error);
-
-						if(obj == NULL)
-							{
-								if(error->occurred == 0)
-									// There's no such variable.
-									Error_Report(error, 1, "Reference to undefined variable \"%s\"", ops[0].as_string);
-								return 0;
-							}
+						obj = Object_Select(locations[p], key, Runtime_GetHeap(runtime), error);
 					}
-				else 
-					if(obj == NULL)
+
+				if(obj == NULL)
+					{
+						if(error->occurred == 0)
+							// There's no such variable.
+							Error_Report(error, 1, "Reference to undefined variable \"%s\"", ops[0].as_string);
 						return 0;
+					}
 
 				if(!Runtime_Push(runtime, error, obj))
 					return 0;
@@ -912,7 +914,7 @@ static _Bool step(Runtime *runtime, Error *error)
 				assert(ops[0].type == OPTP_INT);
 				assert(ops[1].type == OPTP_INT);
 
-				Object *obj = Object_FromNojaFunction(runtime, runtime->frame->exe, ops[0].as_int, ops[1].as_int, runtime->heap, error);
+				Object *obj = Object_FromNojaFunction(runtime, runtime->frame->exe, ops[0].as_int, ops[1].as_int, runtime->frame->globals, runtime->heap, error);
 
 				if(obj == NULL)
 					return 0;
@@ -1033,7 +1035,7 @@ static _Bool step(Runtime *runtime, Error *error)
 	return 1;
 }
 
-Object *run(Runtime *runtime, Error *error, Executable *exe, int index, Object **argv, int argc)
+Object *run(Runtime *runtime, Error *error, Executable *exe, int index, Object *globals, _Bool is_global_scope, Object **argv, int argc)
 {
 	assert(runtime != NULL);
 	assert(error != NULL);
@@ -1053,14 +1055,28 @@ Object *run(Runtime *runtime, Error *error, Executable *exe, int index, Object *
 	Frame frame;
 	{
 		frame.prev = NULL;
-		frame.vars = Object_NewMap(-1, runtime->heap, error);
+
+		if(is_global_scope)
+			{
+				if(globals == NULL)
+					globals = Object_NewMap(-1, runtime->heap, error);
+
+				frame.globals = globals;
+				frame.locals = frame.globals;
+			}
+		else
+			{
+				frame.globals = globals;
+				frame.locals = Object_NewMap(-1, runtime->heap, error);
+			}
+
+		if(frame.locals == NULL)
+			return NULL;
+
 		frame.exe  = Executable_Copy(exe);
 		frame.index = index;
 		frame.used  = 0;
 
-		if(frame.vars == NULL)
-			return NULL;
-
 		if(frame.exe == NULL)
 			{
 				Error_Report(error, 1, "Failed to copy executable");

src/runtime/runtime.h

@@ -23,9 +23,9 @@ Snapshot *Snapshot_New(Runtime *runtime);
 void 	  Snapshot_Free(Snapshot *snapshot);
 void 	  Snapshot_Print(Snapshot *snapshot, FILE *fp);
 
-Object *run(Runtime *runtime, Error *error, Executable *exe, int index, Object **argv, int argc);
+Object *run(Runtime *runtime, Error *error, Executable *exe, int index, Object *globals, _Bool is_global_scope, Object **argv, int argc);
 
 Object *Object_NewBuiltinsMap(Runtime *runtime, Heap *heap, Error *err);
 Object*	Object_FromNativeFunction(Runtime *runtime, Object *(*callback)(Runtime*, Object**, unsigned int, Error*), int argc, Heap *heap, Error *error);
-Object* Object_FromNojaFunction(Runtime *runtime, Executable *exe, int index, int argc, Heap *heap, Error *error);
+Object *Object_FromNojaFunction(Runtime *runtime, Executable *exe, int index, int argc, Object *globals, Heap *heap, Error *error);
 #endif