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, 44 insertions, 0 deletions

diff --git a/source.h b/source.h
new file mode 100644
index 0000000..4ca01b3
--- /dev/null
+++ b/source.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 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
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef __SOURCE_H_
+#define __SOURCE_H_
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdio.h>
+
+#include "util.h"
+
+
+uc_declare_vector(uc_lineinfo, uint8_t);
+
+typedef struct {
+	char *filename, *buffer;
+	FILE *fp;
+	size_t usecount, off;
+	uc_lineinfo lineinfo;
+} uc_source;
+
+uc_source *uc_source_new_file(const char *path);
+uc_source *uc_source_new_buffer(const char *name, char *buf, size_t len);
+
+size_t uc_source_get_line(uc_source *source, size_t *offset);
+
+uc_source *uc_source_get(uc_source *source);
+void uc_source_put(uc_source *source);
+
+#endif /* __SOURCE_H_ */