treewide: rewrite ucode interpreter

Replace the former AST walking interpreter implementation with a single pass
bytecode compiler and a corresponding virtual machine.

The rewrite lays the groundwork for a couple of improvements with will be
subsequently implemented:

 - Ability to precompile ucode sources into binary byte code
 - Strippable debug information
 - Reduced runtime memory usage

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 33 insertions, 18 deletions

diff --git a/module.h b/module.h
index 6d11a16..9885270 100644
--- a/module.h
+++ b/module.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020 Jo-Philipp Wich <jo@mein.io>
+ * Copyright (C) 2020-2021 Jo-Philipp Wich <jo@mein.io>
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -17,27 +17,42 @@
 #ifndef __MODULE_H_
 #define __MODULE_H_
 
-#include "ast.h"
 #include "lib.h"
+#include "object.h"
+#include "vm.h"
 
-struct uc_ops {
-	bool (*register_function)(struct uc_state *, struct json_object *, const char *, uc_c_fn *);
-	bool (*register_type)(const char *, struct json_object *, void (*)(void *));
-	struct json_object *(*set_type)(struct json_object *, const char *, void *);
-	void **(*get_type)(struct json_object *, const char *);
-	struct json_object *(*new_object)(struct json_object *);
-	struct json_object *(*new_double)(double);
-	struct json_object *(*invoke)(struct uc_state *, uint32_t, struct json_object *, struct json_object *, struct json_object *);
-	enum json_type (*cast_number)(struct json_object *, int64_t *, double *);
-};
-
-extern const struct uc_ops ut;
-
-#define register_functions(state, ops, functions, scope) \
+#define register_functions(scope, functions) \
 	if (scope) \
 		for (int i = 0; i < ARRAY_SIZE(functions); i++) \
-			ops->register_function(state, scope, functions[i].name, functions[i].func)
+			json_object_object_add(scope->header.jso, functions[i].name, \
+				ops->value.cfunc(functions[i].name, functions[i].func))
+
+#define alloc_prototype(functions) ({ \
+	uc_prototype *__proto = uc_object_as_prototype(ops->value.proto(NULL)); \
+	register_functions(__proto, functions); \
+	__proto; \
+})
+
+#define declare_type(name, proto, freefn) \
+	ops->ressource.define(name, proto, freefn)
+
+#define alloc_ressource(data, type) \
+	ops->ressource.create(xjs_new_object(), type, data)
+
+#define register_ressource(scope, key, res) \
+	json_object_object_add((scope)->header.jso, key, (res)->header.jso)
+
+static const uc_ops *ops;
+
+void uc_module_init(uc_prototype *scope) __attribute__((weak));
+
+void uc_module_entry(const uc_ops *_ops, uc_prototype *scope);
+void uc_module_entry(const uc_ops *_ops, uc_prototype *scope)
+{
+	ops = _ops;
 
-void uc_module_init(const struct uc_ops *, struct uc_state *, struct json_object *);
+	if (uc_module_init)
+		uc_module_init(scope);
+}
 
 #endif /* __MODULE_H_ */