creating a VM (ch15)

src/utils.zig

@@ -1,6 +1,26 @@
+const std = @import("std");
+const debug = std.debug;
+
+const Chunk = @import("./chunk.zig").Chunk;
+const print_value = @import("./values.zig").print_value;
+
 pub fn grow_capacity(capacity: usize) usize {
     if (capacity < 8) {
         return 8;
     }
     return capacity * 2;
 }
+
+pub fn simple_instruction(opcode_name: []const u8, offset: usize) usize {
+    debug.print("{s:16}\n", .{opcode_name});
+
+    return offset + 1;
+}
+
+pub fn constant_instruction(opcode_name: []const u8, chunk: Chunk, offset: usize) usize {
+    const constant = chunk.code[offset + 1];
+    debug.print("{s:16} {d:4} '", .{ opcode_name, constant });
+    print_value(chunk.constants.values[constant]);
+    debug.print("'\n", .{});
+    return offset + 2;
+}