From 2ad2be250a68e907b308b120b934edcbfc99ae6e Mon Sep 17 00:00:00 2001
From: Ben Winston
Date: Sat, 20 May 2023 22:54:07 -0400
Subject: block scope and local variables (not really working)

---
 vm.d | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

(limited to 'vm.d')

diff --git a/vm.d b/vm.d
index 7955963..3988d14 100644
--- a/vm.d
+++ b/vm.d
@@ -82,6 +82,15 @@ class VM {
             }
             writeln("\n--");
 
+            /*
+            write(" globals >");
+            //for (int i = 0; i < this.topOffset; i++) {
+            foreach (Value val; globals) {
+                writef("[ %s ]", printableValue(val));
+            }
+            writeln("\n--");
+            */
+
             disassemble(this.func.chunk, this.ip);
             ubyte inst;
             switch (inst = this.readByte()) {
@@ -94,6 +103,23 @@ class VM {
                     Value val = pop();
                     globals[asString(name)] = val;
                     break;
+                case OpCode.OP_GET_LOCAL:
+                    ubyte slot = readByte();
+                    writefln("getting local '%d' stackTop '%d'", slot, topOffset);
+                    //push(stack[topOffset + slot - 2]);
+                    //push(stack[topOffset + slot]);
+                    push(stack[topOffset - 2 + slot]);
+                    //push(stack[slot]);
+                    break;
+                case OpCode.OP_SET_LOCAL:
+                    //writeln("in SET_LOCAL");
+                    ubyte slot = readByte();
+                    //stack[slot] = peek(0);
+                    stack[topOffset + slot - 1] = peek(0);
+                    //pop();
+                    //stack[slot] = pop();
+                    writefln("setting local '%d' stackTop '%d'", slot, topOffset);
+                    break;
                 case OpCode.OP_GET_GLOBAL:
                     writeln("in OP_GET_GLOBAL");
                     Value name = func.chunk.constants[readByte()];
@@ -171,6 +197,14 @@ class VM {
                     Value ret = this.pop();
                     writefln("returned %s", printableValue(ret));
                     return InterpretResult.OK;
+                case OpCode.OP_POP:
+                    pop();
+                    break;
+                case OpCode.OP_POP_SCOPE:  // pop the n-1 position
+                    Value val = pop();
+                    pop();  // throw this one away
+                    push(val);
+                    break;
                 default:
                     writeln("unknown opcode to run");
                     break;
-- 
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