1 files changed, 94 insertions, 0 deletions
diff --git a/src/runtime.h b/src/runtime.h
new file mode 100644
index 0000000..4efe074
--- /dev/null
+++ b/src/runtime.h
@@ -0,0 +1,94 @@
+/* Copyright (C) 2023 Aryadev Chavali
+
+ * You may distribute and modify this code under the terms of the
+ * GPLv2 license.  You should have received a copy of the GPLv2
+ * license with this file.  If not, please write to:
+ * aryadev@aryadevchavali.com.
+
+ * Created: 2023-10-15
+ * Author: Aryadev Chavali
+ * Description: Virtual machine implementation
+ */
+
+#ifndef RUNTIME_H
+#define RUNTIME_H
+
+#include <stdlib.h>
+
+#include "./base.h"
+#include "./inst.h"
+
+#define VM_BYTE_REGISTERS  8
+#define VM_WORD_REGISTERS  8
+#define VM_FLOAT_REGISTERS 8
+typedef struct
+{
+  struct Registers
+  {
+    word ret;
+    byte b[VM_BYTE_REGISTERS];
+    word w[VM_WORD_REGISTERS];
+    f64 f[VM_FLOAT_REGISTERS];
+  } registers;
+  struct Stack
+  {
+    byte *data;
+    word ptr, max;
+  } stack;
+  struct Program
+  {
+    inst_t *instructions;
+    word ptr, max;
+  } program;
+} vm_t;
+
+void vm_load_stack(vm_t *, byte *, size_t);
+void vm_load_program(vm_t *, inst_t *, size_t);
+
+void vm_execute(vm_t *);
+
+void vm_push_byte(vm_t *, data_t);
+void vm_push_word(vm_t *, data_t);
+void vm_push_float(vm_t *, data_t);
+
+typedef void (*push_f)(vm_t *, data_t);
+static const push_f PUSH_ROUTINES[] = {
+    [OP_PUSH_BYTE]  = vm_push_byte,
+    [OP_PUSH_WORD]  = vm_push_word,
+    [OP_PUSH_FLOAT] = vm_push_float,
+};
+
+void vm_push_byte_register(vm_t *, word);
+void vm_push_word_register(vm_t *, word);
+void vm_push_float_register(vm_t *, word);
+
+typedef void (*push_reg_f)(vm_t *, word);
+static const push_reg_f PUSH_REG_ROUTINES[] = {
+    [OP_PUSH_BYTE_REGISTER]  = vm_push_byte_register,
+    [OP_PUSH_WORD_REGISTER]  = vm_push_word_register,
+    [OP_PUSH_FLOAT_REGISTER] = vm_push_float_register,
+};
+
+void vm_mov_byte(vm_t *, data_t, word);
+void vm_mov_word(vm_t *, data_t, word);
+void vm_mov_float(vm_t *, data_t, word);
+
+typedef void (*mov_f)(vm_t *, data_t, word);
+static const mov_f MOV_ROUTINES[] = {
+    [OP_MOV_BYTE]  = vm_mov_byte,
+    [OP_MOV_WORD]  = vm_mov_word,
+    [OP_MOV_FLOAT] = vm_mov_float,
+};
+
+data_t vm_pop_byte(vm_t *);
+data_t vm_pop_word(vm_t *);
+data_t vm_pop_float(vm_t *);
+
+typedef data_t (*pop_f)(vm_t *);
+static const pop_f POP_ROUTINES[] = {
+    [OP_POP_BYTE]  = vm_pop_byte,
+    [OP_POP_WORD]  = vm_pop_word,
+    [OP_POP_FLOAT] = vm_pop_float,
+};
+
+#endif