From 618de4c70d8916f64781997f3ae538e3e6109d00 Mon Sep 17 00:00:00 2001
From: Ben Winston
Date: Sun, 21 May 2023 16:20:41 -0400
Subject: if/else, 'and' control flow

---
 dbg.d | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'dbg.d')

diff --git a/dbg.d b/dbg.d
index 89ae8c1..e14e9fe 100644
--- a/dbg.d
+++ b/dbg.d
@@ -1,5 +1,6 @@
 import std.stdio;
 import std.string;
+import std.conv;
 
 import chunk;
 import parser;
@@ -83,6 +84,13 @@ string atomAsString(Atom a) {
     return printableValue(a.value);
 }
 
+int jumpInstruction(string message, int sign, Chunk chunk, int offset) {
+    uint jump = to!uint(chunk.code[offset + 1] << 8);
+    jump |= chunk.code[offset + 2];
+    writefln("%-16s %4d -> %d", message, offset, offset + 3 + sign * jump);
+    return offset + 3;
+}
+
 int byteInstruction(string message, Chunk chunk, int offset) {
     ubyte slot = chunk.code[offset + 1];
     writefln("%-16s %4d", message, slot);
@@ -135,6 +143,11 @@ int disassemble(Chunk chunk, int offset) {
             return simpleInstruction("OP_RETURN", offset);
         case OpCode.OP_NIL:
             return simpleInstruction("OP_NIL", offset);
+        case OpCode.OP_JUMP:
+            return jumpInstruction("OP_JUMP", 1, chunk, offset);
+        case OpCode.OP_JUMP_IF_FALSE:
+            return jumpInstruction("OP_JUMP_IF_FALSE", 1, chunk, offset);
+
         default:
             writeln("unknown opcode?");
             return offset + 1;
-- 
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